CN104976809A - Refrigerating device - Google Patents

Abstract

The invention provides a refrigerating device capable of relieving reduction of the running capability when the flow direction of refrigerant is switched in a refrigerant loop. An air adjusting device is the air adjusting device of the refrigerant loop comprising an indoor unit and an outdoor unit which are connected through a connecting pipe, and the outdoor unit, a four-way conversion valve and an executing part are included. The four-way conversion valve can switch the flow direction of the refrigerant so that the flow direction of the refrigerant in the refrigerant loop can be changed into the first state or the second state. The executing component executes the first control and the second control. In the first control, the four-way conversion valve is controlled so that the four-way conversion valve can be changed into the first state from the second state. In the second control, the four-way conversion valve is controlled so that the four-way conversion valve can be changed into the second state from the first state. Meanwhile, the needed first control executing time from starting of the first control to ending of the first control is shorter than the needed second control executing time from starting of the second control to ending of the second control.

Description

Refrigerating plant

Technical field

The present invention relates to a kind of refrigerating plant.

Background technology

Formed in the existing refrigerating plant of refrigerant loop by tube connector connection range site and heat source unit, in heat source unit, be mostly provided with switching mechanism, to switch in the flow direction of the cold-producing medium in refrigerant loop.In refrigerating plant as above, when switching flowing to of cold-producing medium by control switching mechanism, there is uncomfortable switching sound in the pressure reduction because of cold-producing medium sometimes.In order to suppress the appearance of this switching sound, such as, at patent document 1(Unexamined Patent 9-14804 publication) in, the pressure reduction of cold-producing medium when switching refrigerant flow direction to relax, make compressor stop driving before controlling switching mechanism for the time being, when controlling switching mechanism, compressor is driven again.

But once carry out the stopping of compressor/again drive, running ability when carrying out described operation can reduce.Therefore, as described in patent document 1, which, each stopping/again driving carrying out first compression machine when controlling switching mechanism, then there will be the problem that part running ability reduces.

Summary of the invention

Therefore, the object of the invention is to, a kind of refrigerating plant is provided, the decline of running ability when this refrigerating plant switches flowing to of cold-producing medium in refrigerant loop, can be lowered.

Refrigerating plant according to a first aspect of the present invention, comprises the refrigerant loop formed by tube connector connection range site and heat source unit.Wherein heat source unit comprises switching mechanism and control part.Switching mechanism can switch the flow direction of cold-producing medium, is in the 1st state or the 2nd state to make the flow direction of cold-producing medium in refrigerant loop.Control part performs the 1st and controls and the 2nd control.In controlling the 1st, control part becomes 1st state to make the flow direction of cold-producing medium in refrigerant loop from the 2nd state by controlling switching mechanism.In controlling the 2nd, control part controls switching mechanism and becomes the 2nd state to make the flow direction of cold-producing medium in refrigerant loop from the 1st state.And, from the 1st control to end the 1st control needed for the 1st control the time of implementation, than from the 2nd control to end the 2nd control needed for the 2nd control the time of implementation short.

In refrigerating plant according to a first aspect of the present invention, the 1st control time of implementation controlled the time of implementation than the 2nd short.Therefore, though in refrigerant loop running ability with for switch cold-producing medium flow to that required time is proportional to be reduced time, the reduction of running ability when execution the 1st can be suppressed compared with when controlling with execution the 2nd to control.

According to this formation, running ability when switching the flowing to of cold-producing medium in refrigerant loop can be reduced and decline.

Refrigerating plant according to a second aspect of the present invention, according in the refrigerating plant of first aspect, heat source unit has compressor.The cold-producing medium that compressor compresses flows in refrigerant loop.Control part controls compressor.And, control compressor in controlling the 2nd, reduce to make the revolution of compressor before controlling switching mechanism.Control compressor in controlling the 1st, with make control the revolution of compressor before switching mechanism be not less than the 2nd control time revolution.In this refrigerating plant, due to when implementation the 1st controls, the revolution of compressor is not less than revolution when execution the 2nd controls, and running ability can be suppressed to reduce.

Refrigerating plant according to a third aspect of the present invention, according in the refrigerating plant of second aspect, controls compressor in controlling the 2nd, stops before control switching mechanism to make compressor.In controlling the 1st, control compressor to make the revolution of the compressor before and after control switching mechanism constant.In this refrigerating plant, during owing to performing the 1st control, the revolution controlling the compressor before and after switching mechanism does not reduce, and compared with when stopping the 2nd of compressor the to control before controlling switching mechanism with execution, the time needed for the flow direction switching cold-producing medium in refrigerant loop is short.And, during owing to performing the 1st control, the revolution controlling the compressor before and after switching mechanism does not reduce, and compared with when stopping the 2nd of compressor the to control before controlling switching mechanism with execution, can prevent the reduction of running ability during the flowing to of cold-producing medium in switching refrigerant loop.

Refrigerating plant according to a fourth aspect of the present invention, according in the refrigerating plant of second aspect or the third aspect, range site has and utilizes side heat exchanger.Under the 1st state, high-pressure refrigerant flows to and utilizes side heat exchanger.Under the 2nd state, low pressure refrigerant flows to and utilizes side heat exchanger.

Here, present inventor finds to send the reason of uncomfortable switching sound when controlling switching mechanism, and has dependency relation utilizing between the refrigerant pressure flowed in the heat exchanger of side.Specifically, when switching the flow direction of cold-producing medium to make when utilizing the cold-producing medium flowed in the heat exchanger of side to become low pressure refrigerant from high-pressure refrigerant, under the state of revolution not reducing compressor, controlling switching mechanism, then can produce higher uncomfortable switching sound when controlling switching mechanism.On the other hand, when switching the flow direction of cold-producing medium to make when utilizing the cold-producing medium flowed in the heat exchanger of side to become high-pressure refrigerant from low pressure refrigerant, even if control switching mechanism under the state of revolution not reducing compressor, switching sound when controlling switching mechanism is lower.

In refrigerating plant according to a fourth aspect of the present invention, when the flow direction of cold-producing medium is the 1st state, high-pressure refrigerant flows to and utilizes side heat exchanger; When the flow direction of cold-producing medium is the 2nd state, low pressure refrigerant flows to and utilizes side heat exchanger.And, when execution the 2nd controls to make the flow direction of cold-producing medium in refrigerant loop be switched to the 2nd state from the 1st state, first control compressor before controlling switching mechanism, reduce to make the revolution of compressor.On the other hand, when execution the 1st controls to make the flow direction of cold-producing medium in refrigerant loop be switched to the 1st state from the 2nd state, control before switching mechanism, control compressor with make the revolution of compressor be not less than the 2nd control time revolution.Namely, in this refrigerating plant, in execution by when utilizing the cold-producing medium flowed in the heat exchanger of side to switch to the 2nd control of low pressure refrigerant from high-pressure refrigerant, because the revolution of compressor reduces before control switching mechanism, switching sound during control switching mechanism can be made to diminish.And, in this refrigerating plant, when execution the 1st controls, control the revolution of compressor before switching mechanism and be not less than the 2nd revolution when controlling.Due to by when utilizing the cold-producing medium flowed in the heat exchanger of side to switch to high-pressure refrigerant from low pressure refrigerant, even if control switching mechanism not reduce to make the revolution of compressor, switch sound also less, switching sound when execution the 1st controls can be reduced, wherein, described execution the 1st controls to be by utilizing the cold-producing medium flowed in the heat exchanger of side to switch to high-pressure refrigerant from low pressure refrigerant.

According to this formation, though carry out the 1st control and the 2nd control any one control, can inhibitory control switching mechanism time switching sound.

Refrigerating plant according to a fifth aspect of the present invention, according in the refrigerating plant of fourth aspect, heat source unit has heat source side heat exchanger.This heat source side heat exchanger plays a role as condenser or evaporimeter.And, when warming operation is switched to reverse cycle defrosting running, perform the 2nd control.That is, when utilizing the cold-producing medium flowed in the heat exchanger of side to switch to low pressure refrigerant from high-pressure refrigerant, performing the 2nd and controlling.Further, when being switched to warming operation from reverse cycle defrosting running, performing the 1st and control.That is, when utilizing the cold-producing medium flowed in the heat exchanger of side to switch to high-pressure refrigerant from low pressure refrigerant, performing the 1st and controlling.In warming operation, heat source side heat exchanger plays a role as evaporimeter.In reverse cycle defrosting running, heat source side heat exchanger plays a role as condenser.In this refrigerating plant, the time controlled than execution the 2nd due to the time performing the 1st control is short, even running ability with for switches cold-producing medium in refrigerant loop flow to required time reduce pro rata time, running ability decline when switching to warming operation from reverse cycle defrosting running can be reduced.

Refrigerating plant according to a sixth aspect of the present invention, in the refrigerating plant of any one according to first to the 5th, range site has the 1st and utilizes side heat exchanger and the 2nd to utilize side heat exchanger.1st utilizes side heat exchanger to play a role as condenser or evaporimeter.2nd utilizes side heat exchanger to play a role as condenser or evaporimeter.2nd utilizes side heat exchange to be different from the heat exchanger that the 1st utilizes side heat exchanger.And, when cooling operation is switched to dehumidifying running, perform the 1st control.Further, when dehumidifying running is switched to cooling operation, perform the 2nd to control.In cooling operation, the 1st utilizes side heat exchanger and the 2nd to utilize side heat exchanger to play a role as evaporimeter.In dehumidifying running, the 1st utilizes side heat exchanger to play a role as condenser, and the 2nd utilizes side heat exchanger to play a role as evaporimeter.In this refrigerating plant, the time controlled than execution the 2nd due to the time performing the 1st control is short, even running ability with for switches cold-producing medium in refrigerant loop flow to required time reduce pro rata time, running ability decline when switching to dehumidifying running from cooling operation can be reduced.

Invention effect

In refrigerating plant according to a first aspect of the present invention, running ability when switching the flowing to of cold-producing medium in refrigerant loop can be reduced and decline.

In refrigerating plant according to a second aspect of the present invention, when execution the 1st can be suppressed to control, running ability declines.

In refrigerating plant according to a third aspect of the present invention, compared with when controlling with execution the 2nd, perform the reduction of the 1st running ability when can prevent from switching the flowing to of cold-producing medium in refrigerant loop when controlling.

In refrigerating plant according to a fourth aspect of the present invention, though carry out the 1st control and the 2nd control any one control, can inhibitory control switching mechanism time switching sound.

In refrigerating plant according to a fifth aspect of the present invention, running ability when switching to warming operation from reverse cycle defrosting running can be reduced and decline.

In refrigerating plant according to a sixth aspect of the present invention, even running ability with for switches cold-producing medium in refrigerant loop flow to required time reduce pro rata time, running ability decline when switching to dehumidifying running from cooling operation can be reduced.

Accompanying drawing explanation

Fig. 1 is the refrigerant loop figure of the conditioner relating to the present invention the 1st embodiment;

Fig. 2 is the refrigerant loop figure of the conditioner relating to the present invention the 1st embodiment;

Fig. 3 is the control module figure of the control device of the conditioner relating to the present invention the 1st embodiment;

Fig. 4 is the time diagram representing the action being performed compressor and four-port conversion value when the 1st control and the 2nd controls by control device;

Fig. 5 is the refrigerant loop figure of the conditioner relating to the present invention the 2nd embodiment;

Fig. 6 is the refrigerant loop figure of the conditioner relating to the present invention the 2nd embodiment;

Fig. 7 is the control device control module figure of the conditioner relating to the present invention the 2nd embodiment;

Fig. 8 is the refrigerant loop figure of the conditioner relating to flexible routine 2B.

(symbol description)

10 conditioners (refrigerating plant)

11 refrigerant loops

20 outdoor units (heat source unit)

22 compressors

23 four-port conversion values (switching mechanism)

24 outdoor heat converters (heat source side heat exchanger)

30 indoor units (range site)

32 indoor heat converters (utilizing side heat exchanger)

51 liquid phase refrigerant tube connectors (tube connector)

52 vapor phase refrigerant tube connectors (tube connector)

61 enforcement divisions (control part)

100 conditioners (refrigerating plant)

111 refrigerant loops

120 outdoor units (heat source unit)

122 compressors

123 the 1st four-port conversion values (switching mechanism)

124 outdoor heat converters (heat source side heat exchanger)

130 the 2nd indoor units (range site)

132a the 1st indoor heat converter (utilizing side heat exchanger/1st to utilize side heat exchanger)

132b the 2nd indoor heat converter (the 2nd utilizes side heat exchanger)

151 hydraulic fluid side connecting refrigerant lines (tube connector)

152 gas side connecting refrigerant lines (tube connector)

161 enforcement divisions (control part)

Detailed description of the invention

Below in conjunction with accompanying drawing, the conditioner 10 as refrigerating plant related in one embodiment of the invention is described.In addition, relate to the embodiment of refrigerating plant of the present invention, be not limited to the following embodiment illustrated, can also carry out being out of shape and improving in the scope not departing from principle of the present invention.

< the 1st embodiment >

(1) structure of conditioner 10

Fig. 1 and Fig. 2 is the refrigerant loop figure of the conditioner 10 relating to the present invention the 1st embodiment.In addition, the flow direction of cold-producing medium when the arrow in Fig. 1 represents warming operation.And, the flow direction of cold-producing medium when the arrow in Fig. 2 represents that cooling operation and reverse cycle defrosting operate.This conditioner 10 is the kind of refrigeration cycle runnings by carrying out steam compression type, is used in refrigeration/heating device.This conditioner 10 carries out the various runnings comprising warming operation, cooling operation and reverse cycle defrosting.Reverse cycle defrosting running is attached to the running needed for frost on outdoor heat converter 24 when being removing warming operation.Conditioner 10 mainly has the outdoor unit 20 as a heat source unit, the indoor unit 30 as a range site, the liquid phase refrigerant tube connector 51 connecting outdoor unit 20 and indoor unit 30 and vapor phase refrigerant tube connector 52 and control device 60(reference Fig. 3).

(2) detailed construction

(2-1) indoor unit 30

Indoor unit 30 is hung by ceiling imbedded formula or ceiling establishes mode disposed in the interior, or is arranged by the mode being suspended on indoor wall.Indoor unit 30 is connected with outdoor unit 20 via liquid phase refrigerant tube connector 51 and vapor phase refrigerant tube connector 52, and forms a part for refrigerant loop 11.And indoor unit 30 has indoor refrigerant loop 13, the indoor fan 31 as blower fan, the indoor unit control part 63 of the part forming refrigerant loop 11.

(2-1-1) indoor refrigerant loop 13

Indoor refrigerant loop 13 mainly comprises as utilizing the indoor heat converter 32 of side heat exchanger and the indoor expansion valve 33 as expansion mechanism.

(2-1-1-1) indoor heat converter 32

Indoor heat converter 32 is, the cross-flow fin-tube heat exchanger be such as made up of heat-transfer pipe and multiple fin, during cooling operation, indoor heat converter 32 plays a role as the evaporimeter of cold-producing medium and cools room air, and during warming operation, indoor heat converter 32 plays a role and heating indoor air as the condenser of cold-producing medium.

(2-1-1-2) indoor expansion valve 33

Indoor expansion valve 33 is the electric expansion valves be connected with the hydraulic fluid side of indoor heat converter 32, for adjusting in indoor refrigerant loop 13 pressure of the cold-producing medium of flowing and flow etc.

(2-1-2) indoor fan 31

Indoor fan 31 is disposed in indoor unit 30.Room air sucks in indoor unit 30 by indoor fan 31, and to indoor be provided in indoor heat converter 32 carry out heat exchange with cold-producing medium after as the air supplying air and carry out heat exchange.Indoor fan 31 for changing the fan of the air air quantity provided to indoor heat converter 32, such as, adopts centrifugal fan or multi blade fan.

(2-1-3) indoor unit control part 63

Fig. 3 is the control module figure of the control device 60 of conditioner 10.

Indoor unit control part 63 has CPU and memory etc., controls the action of the various machines forming indoor unit 30.Indoor unit control part 63, can send or reception control signal to the remote controller (not shown) for individual operations indoor unit 30, or can send or reception control signal to outdoor unit 20 via electric wire.

And indoor unit control part 63 is connected with various sensor.As various sensor, such as, indoor hydraulic fluid side temperature sensor 96, Indoor Air side temperature sensor 97 and indoor temperature transmitter 98 etc. are had.The hydraulic fluid side of indoor liquid side temperature sensor 96 heat exchanger 32 disposed in the interior, for detecting the temperature of cold-producing medium.The gas side of Indoor Air side temperature sensor 97 heat exchanger 32 disposed in the interior, for detecting the temperature of cold-producing medium.Near the indoor air sucting inlet of indoor temperature transmitter 98 unit 30 disposed in the interior, for detecting the temperature of the room air flowed in indoor unit 30, namely, indoor temperature.In addition, indoor liquid side temperature sensor 96, Indoor Air side temperature sensor 97 and indoor temperature transmitter 98 are made up of thermistor.

(2-2) outdoor unit 20

Outdoor unit 20 is connected with indoor unit 30 via liquid phase refrigerant tube connector 51 and vapor phase refrigerant tube connector 52, forms a part for refrigerant loop 11.And, outdoor unit 20 have the part forming refrigerant loop 11 outside refrigerant loop 12, as the outdoor fan 21 of blower fan and outdoor unit control part 62.

(2-2-1) outside refrigerant loop 12

Outside refrigerant loop 12, mainly comprises compressor 22, the four-port conversion value 23 as switching mechanism, the outdoor heat converter 24 as heat source side heat exchanger, the outdoor expansion valve 25 as expansion mechanism, the subcooler 28 as temperature adjusting mechanism, bypass circulation 15, hydraulic fluid side stop valve 26 and gas side stop valve 27 as the cooling source of subcooler 28.And, in this embodiment, be connected formed the refrigerant loop 11 of conditioner 10 by indoor refrigerant loop 13, outside refrigerant loop 12, liquid phase refrigerant tube connector 51, vapor phase refrigerant tube connector 52.

In addition, in this embodiment, outside refrigerant loop 12 comprises subcooler 28 and bypass circulation 15, but the structure of outside refrigerant loop is not limited thereto, outside refrigerant loop also can adopt and comprise compressor 22, four-port conversion value 23, outdoor heat converter 24, outdoor expansion valve 25, hydraulic fluid side stop valve 26 and gas side stop valve 27, and does not comprise the structure of subcooler 28 and bypass circulation 15.

(2-2-1-1) compressor 22

Compressor 22 is the compressor that can change running capacity, by Frequency Converter Control revolution.Compressor 22 is compressed in the cold-producing medium of flowing in refrigerant loop 11.

(2-2-1-2) four-port conversion value 23

Four-port conversion value 23 is the valves needed for the flow direction for switching cold-producing medium, becomes the 2nd state to make the flow direction of cold-producing medium from the 1st state.The 1st state in this embodiment is, the state of the direction of arrow flowing in Fig. 1 pressed by cold-producing medium, that is, high-pressure refrigerant flows to vapor phase refrigerant tube connector 52 and indoor heat converter 32, and low pressure refrigerant flows to the state of outdoor heat converter 24.And in this embodiment, when the refrigerant flow direction in refrigerant loop 11 is the 1st state, indoor heat converter 32 plays a role as condenser, and outdoor heat converter 24 plays a role as evaporimeter.Further, while the waste side that four-port conversion value 23 connects compressor 22 and vapor phase refrigerant tube connector 52 side, connect the suction side of compressor 22 and the gas side of outdoor heat converter 24, be in the 1st state to make the flow direction of the cold-producing medium in refrigerant loop 11.

And the 2nd state in this embodiment is, the state of the direction of arrow flowing in Fig. 2 pressed by cold-producing medium, and high-pressure refrigerant flows to outdoor heat converter 24, and low pressure refrigerant flows to the state of indoor heat converter 32 and vapor phase refrigerant tube connector 52.Further, in this embodiment, when in refrigerant loop 11, the flow direction of cold-producing medium is the 2nd state, outdoor heat converter 24 plays a role as condenser, and indoor heat converter 32 plays a role as evaporimeter.While four-port conversion value 32 connects the waste side of compressor 22 and the gas side of outdoor heat converter 24, connect suction side and the vapor phase refrigerant tube connector 52 of compressor 22, become the 2nd state to make the flow direction of the cold-producing medium in refrigerant loop 11.

In addition, for convenience of explanation, while waste side four-port conversion value 23 being connected compressor 22 and vapor phase refrigerant tube connector 52, the state connecting the four-port conversion value 23 of the suction side of compressor 22 and the gas side of outdoor heat converter 24 is referred to as the 1st switching state.While four-port conversion value 23 being connected the waste side of compressor 22 and the gas side of outdoor heat converter 24, the connection suction side of compressor 22 and the state of vapor phase refrigerant tube connector 52 are referred to as the 2nd switching state.Namely, when the state of four-port conversion value 23 is in the 1st switching state, the refrigerant flow direction in refrigerant loop 11 becomes the 1st state, and when the state of four-port conversion value 23 is in the 2nd switching state, the refrigerant flow direction in refrigerant loop 11 becomes the 2nd state.

(2-2-1-3) outdoor heat converter 24

In this embodiment, outdoor heat converter 24 have employed fin tube type heat exchanger.Wherein, described heat exchanger comprises, such as header, shunt tubule, make header and the spaced and multiple flat tubes be connected abreast of shunting tubule.In addition, as outdoor heat converter 24, being not limited to fin tube type, such as, also can be shell-and-tube exchanger or heat-exchangers of the plate type.

The gas side of outdoor heat converter 24 is connected with four-port conversion value 23, and its hydraulic fluid side is connected with outdoor expansion valve 25.Outdoor heat converter 24 with carried out heat exchange by the air that outdoor fan 21 is supplied.When cooling operation, outdoor heat converter 24 plays a role as condenser, makes the vapor phase refrigerant liquefaction flowed into from header.When warming operation, outdoor heat converter 24 plays a role as evaporimeter, makes the liquid gas refrigerant vapor flowed into from shunting tubule.

(2-2-1-4) outdoor expansion valve 25

Outdoor expansion valve 25 is electric expansion valve, and for adjusting in outside refrigerant loop 12 pressure of the cold-producing medium of flowing and flow etc., and outdoor expansion valve 25 is connected with the hydraulic fluid side of outdoor heat converter 24.

(2-2-1-5) hydraulic fluid side stop valve 26 and gas side stop valve 27

Hydraulic fluid side stop valve 26 is arranged on the valve on the connector of liquid phase refrigerant tube connector 51.Gas side stop valve 27 is arranged on the valve on the connector of vapor phase refrigerant tube connector 52.

(2-2-1-6) subcooler 28

Subcooler 28 is a kind of heat exchangers, the cold-producing medium be condensed within the condenser is made to carry out heat exchange with the cold-producing medium flowed in bypass circulation 15, in this embodiment, in order to cool the cold-producing medium that is sent to indoor expansion valve 33 in outdoor heat converter 24 after condensation and arrange.Subcooler 28 comprises the 1st refrigerant pipe 28a, the 2nd refrigerant pipe 28b.In outside refrigerant loop 12, one end of the 1st refrigerant pipe 28a be connected subcooler 28 and be connected with the 1st pipe arrangement 12a of outdoor expansion valve 25, the other end be connected subcooler 28 and be connected with the 2nd pipe arrangement 12b of hydraulic fluid side stop valve 26.The refrigerant flow direction be condensed within the condenser the 1st refrigerant pipe 28a.By refrigerant flow direction the 2nd refrigerant pipe 28b of bypass circulation 15.

(2-2-1-7) bypass circulation 15

Bypass circulation 15 has following structure, makes heat exchanger 24 outdoor send a part for the cold-producing medium of outer indoor expansion valve 33 to shunt, and turns back to the suction side of compressor 22.Bypass circulation 15 comprises isocon 15a and collecting fitting 15b.Isocon 15a is connected with the 1st pipe arrangement 12a, to make heat exchanger 24 outdoor be sent to a part for the cold-producing medium of indoor expansion valve 33, shunts before the 1st refrigerant pipe 28a flowing into subcooler 28.And, isocon 15a is provided with the colod-application expansion valve 29 of mistake as expansion mechanism.Collecting fitting 15b be connected four-port conversion value 23 and be connected with the suction pipe arrangement 12c of the suction side of compressor 22, with the suction side making the cold-producing medium flowed out from the 2nd refrigerant pipe 28b of subcooler 28 return compressor 22.Isocon 15a and collecting fitting 15b is connected with the 2nd refrigerant pipe 28b of subcooler 28.

Crossing colod-application expansion valve 29 is for adjusting the pressure of cold-producing medium and the electric expansion valve of flow that flow in bypass circulation 15.Cross colod-application expansion valve 29 and reduce the pressure flowing to the cold-producing medium of isocon 15a from the 1st pipe arrangement 12a.According to this formation, via the 1st pipe arrangement 12a outdoor heat exchanger 24 be sent to the cold-producing medium of indoor expansion valve 33, in subcooler 28, crossed colod-application expansion valve 29 post-decompression refrigerant cools.

(2-2-2) outdoor fan 21

Outdoor fan 21, suction chamber outer air in outdoor unit 20, and make after itself and cold-producing medium carry out heat exchange, to carry out the air after heat exchange to outdoor discharge in outdoor heat converter 24.Outdoor fan 21 is the fans that can change the air air quantity provided to outdoor heat converter 24, such as, adopts propeller type fan etc.

(2-2-3) outdoor unit control part 62

Outdoor unit control part 62 has CPU and memory etc., controls the action of the various machines forming outdoor unit 20.

And outdoor unit control part 62 is connected with various sensor.As various sensor, such as, comprise suction pressure sensor 90, discharge pressure sensor 92, inlet temperature sensor 93a, discharge temperature sensor 93b, outdoor heat converter temperature sensor 94, bypass temperature sensor 99 and outdoor temperature sensor 95.Suction pressure sensor 90 is the sensors of suction pressure detecting compressor 22, between the suction side being arranged on four-port conversion value 23 and compressor 22.Discharge pressure sensor 92 detects the sensor of blowdown presssure of compressor 22, between the waste side being arranged on four-port conversion value 23 and compressor 22.Inlet temperature sensor 93a is the sensor of inlet temperature detecting compressor 22, between the suction side being arranged on four-port conversion value 23 and compressor 22.Discharge temperature sensor 93b is the sensor of exhaust temperature detecting compressor 22, between the waste side being arranged on four-port conversion value 23 and compressor 22.Outdoor heat converter temperature sensor 94 is the sensors of the refrigerant temperature detecting flowing in outdoor heat converter 24, on heat exchanger 24 disposed in the outdoor.Bypass temperature sensor 99 is the sensors needed for refrigerant temperature of the 2nd refrigerant pipe 28b outlet side being detected cooler 28, is arranged on collecting fitting 15b.Outdoor temperature sensor 25 is the sensors detecting the outside air temperature flowed in indoor unit 20, near the suction inlet of unit 20 disposed in the outdoor.In this embodiment, suction pressure sensor 90, discharge pressure sensor 92, inlet temperature sensor 93a, discharge temperature sensor 93b, outdoor heat converter temperature sensor 94, bypass temperature sensor 99 and outdoor temperature sensor 95 etc., be made up of thermistor.

In addition, the exchange of control signal etc. can be carried out between outdoor unit control part 62 and indoor unit control part 63 via transmission line.Namely the control device 60 of the running control carrying out conditioner 10 entirety, is made up of the transmission line between unit controls portion 63 in indoor unit control part 63, outdoor unit control part 62, junction chamber and outdoor unit control part 62.In other words, controlled the various machines of outdoor unit 20 and indoor unit 30 by control device 60, conditioner 10 carries out the various runnings such as warming operation, cooling operation and reverse cycle defrosting running.In addition, carry out in conditioner 10 between various on-stream period, according to the operating load of indoor unit 30, control the various machines of outdoor unit 20 and indoor unit 30.

Next, example explanation is carried out to the control content of warming operation, cooling operation and reverse cycle defrosting running timed unit 60.

Such as, when warming operation, four-port conversion value 23 is in the 1st switching state represented by solid line of Fig. 1.And, indoor expansion valve 33 is controlled so as to make the cold-producing medium of indoor heat converter 32 outlet side reach the degree of supercooling of regulation, hydraulic fluid side stop valve 26 and gas side stop valve 27 change are in opening, outdoor expansion valve 25 carries out degree of superheat control, reach target superheat degree with the degree of superheat of the cold-producing medium making outdoor heat converter 24 outlet side, cross colod-application expansion valve 29 and become buttoned-up status.

Under the state of this refrigerant loop 11, once start compressor 22, outdoor fan 21 and indoor fan 31, the vapor phase refrigerant of low pressure, by being inhaled into compressor 22 and being compressed, becomes the vapor phase refrigerant of high pressure.The vapor phase refrigerant becoming high pressure, via four-port conversion value 23, gas side stop valve 27, flows through vapor phase refrigerant tube connector 52 and is sent to indoor unit 30.The high pressure vapor cold-producing medium being sent to indoor unit 30 is sent to indoor heat converter 32, carries out heat exchange and is condensed, become the liquid phase refrigerant of high pressure with the room air provided by indoor fan 31.This high pressure liquid phase refrigerant, by being depressurized during indoor expansion valve 33, flowing through liquid phase refrigerant tube connector 51 and being sent to outdoor unit 20.Be sent to the liquid phase refrigerant of outdoor unit 20, flow through the 2nd pipe arrangement 12b, the 1st refrigerant pipe 28a, the 1st pipe arrangement 12a successively by hydraulic fluid side stop valve 26, reduced pressure into the gas-liquid two-phase cold-producing medium of low pressure by outdoor expansion valve 25 after, inflow outdoor heat exchanger 24.The gas-liquid two-phase cold-producing medium of the low pressure of inflow outdoor heat exchanger 24 carries out heat exchange with the outdoor air provided by outdoor fan and evaporates, and becomes the vapor phase refrigerant of low pressure.And the vapor phase refrigerant of this low pressure, via four-port conversion value 23, is inhaled in compressor 22 again.

And such as, when cooling operation and when reverse cycle defrosting operates, four-port conversion value 23 is in the 2nd switching state represented by solid line of Fig. 2.In addition, outdoor expansion valve 25 becomes full open state, and hydraulic fluid side stop valve 26 and gas side stop valve 27 change are in opening.Indoor expansion valve 33 carries out degree of superheat control, reaches target superheat degree to make the refrigerant superheat degree of indoor heat converter 32 outlet side.Cross colod-application expansion valve 29 and carry out degree of superheat control, reach target superheat degree with the refrigerant superheat degree of the 2nd refrigerant pipe 28b outlet side making subcooler 28.

Under the state of this refrigerant loop 11, once start compressor 22, outdoor fan 21 and indoor fan 31, the vapor phase refrigerant of low pressure, by being inhaled into compressor 22 and being compressed, becomes the vapor phase refrigerant of high pressure.The vapor phase refrigerant of high pressure is sent in outer outdoor heat converter 24 via four-port conversion value 23, carries out heat exchange and condensation, become the liquid phase refrigerant of high pressure with the outdoor air provided by outdoor fan 21.The liquid phase refrigerant of this high pressure flows into the 1st pipe arrangement 12a by outdoor expansion valve 25.Flow into a part for the high pressure liquid phase refrigerant of the 1st pipe arrangement 12a, flow in the 1st refrigerant pipe 28a of subcooler 28, remainder flows to the isocon 15a of bypass circulation 15.Flow to the high-pressure refrigerant of the isocon 15a of bypass circulation 15, after colod-application expansion valve 29 reduces pressure into the cold-producing medium of gas-liquid two-phase state of low pressure excessively, flow into the 2nd refrigerant pipe 28b of subcooler 28.Flow into the cold-producing medium of the 2nd refrigerant pipe 28b of subcooler 28, flow through collecting fitting 15b and collaborate with the cold-producing medium flowed at suction line 12c.On the other hand, flow into the high pressure liquid phase refrigerant of the 1st refrigerant pipe 28a of subcooler 28, carry out heat exchange with the cold-producing medium flowed in the 2nd refrigerant pipe 28b and then be cooled into supercooled state.

In subcooler 28, become the high pressure liquid phase flow of refrigerant of supercooled state through the 2nd pipe arrangement 12b, and flow through hydraulic fluid side connecting refrigerant lines 51 by hydraulic fluid side stop valve 26, be sent to indoor unit 30.Be sent to the high pressure liquid phase refrigerant of indoor unit 30, reduced pressure into the cold-producing medium of gas-liquid two-phase state of low pressure by indoor expansion valve 33 after, inflow indoor heat exchanger 32.The cold-producing medium of the gas-liquid two-phase state of inflow indoor heat exchanger 32, carries out heat exchange with room air and evaporates, becoming the vapor phase refrigerant of low pressure in indoor heat converter 32.And the vapor phase refrigerant of this low pressure, flows through vapor phase refrigerant tube connector 52 and is sent to outdoor unit 20, via gas side stop valve 27 and four-port conversion value 23, flows through suction line 12c, is again inhaled in compressor 22.

Further, control device 60 has enforcement division 61.Below, enforcement division 61 is described.

(2-2-3-1) enforcement division 61

Fig. 4 is the time diagram representing the movement content being performed compressor 22 and four-port conversion value 23 when the 1st control and the 2nd controls by control device 60.

Enforcement division 61 performs the 1st and controls and the 2nd control.In the operation process of conditioner 10, perform the 1st when switching the flowing to of cold-producing medium in refrigerant loop 11 and control and the 2nd to control.In this embodiment, perform the 1st when conditioner 10 switches between warming operation and reverse cycle defrosting operate and control and the 2nd to control.Wherein, when warming operation, in refrigerant loop 11, refrigerant flow direction is in the 1st state.When reverse cycle defrosting operates, in refrigerant loop 11, refrigerant flow direction is in the 2nd state.Specifically, when conditioner 10 switches to reverse cycle defrosting running from warming operation, perform the 2nd and control.And, when running switches to warming operation from conditioner 10 from reverse cycle defrosting, perform the 1st and control.Further, in the 1st controls and the 2nd controls, the action of four-port conversion value 23 and compressor 22 is controlled by control device 60.

In addition, the switching between warming operation and reverse cycle defrosting operate, generally carries out in a case where.Such as, under the state that conditioner 10 carries out warming operation, once the temperature of outdoor heat converter 24 is lower than set point of temperature, the running of conditioner 10 is then automatic switches to reverse cycle defrosting running from warming operation.Also such as, under the state of carrying out reverse cycle defrosting motion in conditioner 10, once the temperature of outdoor heat converter 24 exceedes set point of temperature, the running of conditioner 10 is then automatic switches to warming operation from reverse cycle defrosting running.

Further, here, as shown in Figure 4, four-port conversion value 23 is in the 1st switching state, and when compressor 22 drives with the revolution exceeding target revolution, is referred to as warming operation.And, four-port conversion value 23 one-tenth the 2nd switching state, and when compressor 22 drives, be referred to as reverse cycle defrosting running.In addition, the 1st control and on the 2nd starting point controlled and terminating point, carry out the control changing any one movement content in four-port conversion value 23 and compressor 22.

Switch the state of four-port conversion value 23 in controlling the 1st, become the 1st state to make the flow direction of cold-producing medium in refrigerant loop 11 from the 2nd state.Specifically, in controlling the 1st, the state of four-port conversion value 23 switches to the 1st switching state from the 2nd switching state.And, the 1st control in, switch four-port conversion value 23 state before control compressor 22, with make the revolution of compressor 22 be not less than execution the 2nd control time revolution.In addition, in the 1st of this embodiment controls, control compressor 22, do not change to make the revolution of the compressor 22 before and after the state of switching four-port conversion value 23.Namely, in the 1st control, the movement content of compressor 22 does not change and only has the movement content of four-port conversion value 23 to change.And, in the 1st of this embodiment controls, when restarting warming operation, maintain compressor 22 revolution when reverse cycle defrosting running stops.

In controlling the 2nd, the state of four-port conversion value 23 is switched to the 2nd switching state from the 1st switching state, becomes the 2nd state to make the flow direction of cold-producing medium in refrigerant loop 11 from the 1st state.And, in controlling the 2nd, control compressor 22 before switching the state of four-port conversion value 23, reduce to make the revolution of compressor 22.In addition, in the 2nd of this embodiment controls, control compressor 22, to make it stop before the state switching four-port conversion value 23, control compressor 22 afterwards, be periodically increased to regulation revolution to make its revolution.That is, in controlling the 2nd, the movement content of compressor 22 is repeatedly changed, and the movement content of four-port conversion value 23 is also changed.

As mentioned above, in controlling the 2nd, temporarily make the revolution of compressor 22 reduce, while making the revolution of compressor 22 increase afterwards, switch the state of four-port conversion value 23.On the other hand, in controlling the 1st, switch the state of four-port conversion value 23, with make the revolution of compressor 22 be not less than the 2nd control time revolution.Therefore, start the time that the 1st controls execution the 1st control extremely needed for termination, control to the time of execution the 2nd control needed for termination short than beginning the 2nd.

And in this embodiment, when conditioner 10 carries out warming operation, namely, when the flow direction of cold-producing medium is the 1st state in refrigerant loop 11, high-pressure refrigerant flows to indoor heat converter 32.On the other hand, when carrying out reverse cycle defrosting running in conditioner 10, namely, when the flow direction of cold-producing medium is the 2nd state in refrigerant loop 11, low pressure refrigerant flows to indoor heat converter 32.Therefore, control once perform the 2nd, and in refrigerant loop 11, the flow direction of cold-producing medium switches to the 2nd state from the 1st state, is provided to the cold-producing medium of indoor heat converter 32, namely, in indoor heat converter 32 flowing cold-producing medium convert low pressure refrigerant to from high-pressure refrigerant.And, control once perform the 1st, and in refrigerant loop 11, the 2nd state that flows to of cold-producing medium switches to the 1st state, is provided to the cold-producing medium of indoor heat converter 32, namely, in indoor heat converter 32 flowing cold-producing medium convert high-pressure refrigerant to from low pressure refrigerant.

(3) feature

（3-1）

In this embodiment, switch the state of four-port conversion value 23, perform when the 2nd state becomes the 1st state to make the flow direction of cold-producing medium in refrigerant loop 11 the 1st time of implementation controlled, than the state switching four-port conversion value 23, the perform when the 1st state becomes the 2nd state to make the flow direction of cold-producing medium in refrigerant loop 11 the 2nd time of implementation controlled is short.Therefore, when switching the flowing to of cold-producing medium in refrigerant loop 11, namely, can shorten warming operation in conditioner 10 and reverse cycle defrosting operate between switch required time when operating.And, even if running ability with in order to switch cold-producing medium in refrigerant loop 11 flow to that required time is proportional to be reduced time, the reduction of running ability when execution the 1st can be suppressed compared with when controlling with execution the 2nd to control.According to this formation, running ability when switching the flowing to of cold-producing medium in refrigerant loop 11 can be reduced and decline.

（3-2）

This embodiment the 1st control in, switch four-port conversion value 23 state before control compressor 22, with make the revolution of compressor 22 be not less than execution the 2nd control time revolution.Therefore, compared with when controlling with execution the 2nd, when execution the 1st can be suppressed to control, running ability reduces.

（3-3）

Control compressor 22 during the 1st of this embodiment controls, to make compressor 22 revolution before and after the state of switching four-port conversion value 23 not change, and control compressor 22 in controlling the 2nd, stopped before switching four-port conversion value 23 to make it.Therefore, compared with when controlling with execution the 2nd, perform the 1st running ability when can prevent from switching the flowing to of cold-producing medium when controlling and reduce.According to this formation, the stopping because of compressor 22 can be suppressed to hinder the phenomenon of comfortableness.

（3-4）

, when present inventor has found the state switching four-port conversion value 23, there is uncomfortable switching sound here, and there is dependency relation utilizing between the refrigerant pressure flowed in side heat exchanger 32.Specifically, once in the flow direction switching cold-producing medium, to make when the cold-producing medium that Indoor Thermal exchanges flowing in 32 becomes low pressure refrigerant from high-pressure refrigerant, the state switching four-port conversion value 23 does not reduce to make the revolution of compressor 22, can produce uncomfortable switching sound when switching the state of four-port conversion value 23.On the other hand, even if find in the flow direction switching cold-producing medium, when becoming high-pressure refrigerant to make the cold-producing medium of flowing in indoor heat converter 32 from low pressure refrigerant, switch four-port conversion value 23 not reduce to make the revolution of compressor 22, switching sound when switching the state of four-port conversion value 23 is less.

In this embodiment, perform the 2nd and control, namely, the cold-producing medium of flowing indoor heat converter 32 in is when converting low pressure refrigerant to from high-pressure refrigerant, stops the revolution of compressor 22 before the state of switching four-port conversion value 23.Therefore, the switching sound during state switching four-port conversion value 23 can be reduced.

And in this embodiment, when performing the 1st control, the revolution of the compressor 22 before and after the state of switching four-port conversion value 23 does not change.But, when low pressure refrigerant due to flowing in indoor heat converter 32 is converted to high-pressure refrigerant, even if the state switching four-port conversion value 23 does not reduce to make the revolution of compressor 22, switch sound less, therefore, perform the 1st control, namely, indoor heat converter 32 in flow cold-producing medium convert high-pressure refrigerant to from low pressure refrigerant, also can reduce switching sound.

Therefore, even if carry out the 1st to control and any one control in the 2nd control, namely, conditioner 10 being when switching to reverse cycle defrosting running from warming operation or switch to warming operation from reverse cycle defrosting state, can reduce switching sound when switching the state of four-port conversion value 23.

（3-5）

In this embodiment, switching in the 1st control of warming operation from reverse cycle defrosting running, controlling compressor 22 and do not change to make compressor 22 revolution before and after the state of switching four-port conversion value 23.Therefore, when running can be suppressed to switch to warming operation from inverse cycle operation, running ability reduces.

According to this formation, when can suppress to switch running, running ability reduces.

(4) flexible example

(4-1) flexible routine 1A

In the above-described embodiments, when conditioner 10 switches to reverse cycle defrosting state from heating state, certain execution the 2nd controls, and when the running of conditioner 10 switches to warming operation from inverse recurrent state, necessarily performs the 1st control.

Replace these, when conditioner 10 switches between warming operation and reverse cycle defrosting operate, according to the refrigerant pressure of flowing in indoor heat converter 32, be judged execution the 1st and control and the 2nd any one control.Such as, when conditioner 10 switches to reverse cycle defrosting running from warming operation, when the refrigerant pressure of flowing exceedes authorized pressure in indoor heat converter 32, perform the 2nd and control; When the refrigerant pressure of flowing is lower than authorized pressure in indoor heat converter 32, performs the 1st and control.And, when the running of conditioner 10 switches to warming operation from reverse cycle defrosting running, when the refrigerant pressure of flowing in indoor heat converter 32 is lower than regulation, performs the 1st and control, when exceeding authorized pressure, perform the 2nd and control.

< the 2nd embodiment >

(1) structure of conditioner 100

Fig. 5 and Fig. 6 is the refrigerant loop figure of the conditioner 100 relating to the present invention the 2nd embodiment.In addition, the flow direction of cold-producing medium when the arrow in Fig. 5 represents that dehumidifying operates.And, the flow direction of cold-producing medium when the arrow in Fig. 6 represents cooling operation.

This conditioner 100 is the kind of refrigeration cycle runnings by carrying out steam compression type, is used in the refrigeration/heating device of the indoor of the buildings such as mansion.This conditioner 100 carries out comprising the various runnings such as warming operation, cooling operation and dehumidifying running.Conditioner 100, mainly has the outdoor unit 120 as a heat source unit, the indoor unit as range site, the liquid phase refrigerant tube connector 151 connecting outdoor unit 120 and indoor unit and vapor phase refrigerant tube connector 152, control device 160(with reference to Fig. 7).In addition, in this embodiment, an outdoor unit 120 is connected with three indoor units.

(2) detailed construction

(2-1) indoor unit

Indoor unit is hung by ceiling imbedded formula or ceiling to establish mode disposed in the interior, or disposed in the interior by the mode being suspended on indoor wall.Indoor unit is connected with outdoor unit 120 via liquid phase refrigerant tube connector 151 and vapor phase refrigerant tube connector 152, and forms a part for refrigerant loop 111.

In addition, in the indoor unit of this embodiment, comprise two kinds of indoor units that structure is different.For convenience of explanation, below the indoor unit 30 comprised with the conditioner 10 relating to the 1st embodiment is had mutually isostructural indoor unit and be referred to as the 1st indoor unit 30, the indoor unit different from the structure of the 1st indoor unit 30 is referred to as the 2nd indoor unit 130.And, because the structure of the 1st indoor unit 30 is identical with the structure of the indoor unit 30 of the 1st embodiment, while the description thereof will be omitted, give the symbol identical with the indoor unit 30 of the 1st embodiment to each parts here.

And, in this embodiment, in vapor phase refrigerant tube connector 152, comprise the 1st vapor phase refrigerant tube connector 152a and the 2nd vapor phase refrigerant tube connector 152b.Further, the 2nd vapor phase refrigerant tube connector 152b connects the 1st indoor unit 30, the 2nd indoor unit 130 and outdoor unit 120.On the other hand, the 1st vapor phase refrigerant tube connector 152a connects the 2nd indoor unit 130 and outdoor unit 120.In other words, the 1st vapor phase refrigerant tube connector 152a is only connected with the 2nd indoor unit 130.

2nd indoor unit 130, by being connected with the 1st indoor unit 30 and outdoor unit 120 via liquid phase refrigerant tube connector 151 and vapor phase refrigerant tube connector 152, forms refrigerant loop 111 between the 1st indoor unit 30 and outdoor unit 120.

2nd indoor unit 130, has indoor refrigerant loop 113, the indoor fan (not shown) as blower fan, the indoor unit control part 163 of the part forming refrigerant loop 111.

(2-1-1) indoor refrigerant loop 113

Indoor refrigerant loop 113, mainly comprises as utilizing the indoor heat converter 132 of side heat exchanger and the indoor expansion valve 133 as expansion mechanism.And indoor refrigerant loop 113, has the 1st pipe arrangement 113a, the 2nd pipe arrangement 113b, the 3rd pipe arrangement 113c.1st pipe arrangement 113a is the pipe arrangement be connected with the 1st vapor phase refrigerant tube connector 152a.2nd pipe arrangement 113b is the pipe arrangement be connected with the 2nd vapor phase refrigerant tube connector 152b.3rd pipe arrangement 113c is the pipe arrangement be connected with liquid phase refrigerant tube connector 151.

(2-1-1-1) indoor heat converter 132

Indoor heat converter 132 is, the cross-flow fin-tube heat exchanger be such as made up of heat-transfer pipe and multiple fin.And indoor heat converter 132 has the 1st indoor heat converter 132a and the 2nd indoor heat converter 132b.

1st indoor heat converter 132a is arranged on the 1st pipe arrangement 113a.1st indoor heat converter 132a is when cooling operation, and the evaporimeter as cold-producing medium plays a role, and cools room air; When dehumidifying running and warming operation, the condenser as cold-producing medium plays a role, and heating indoor air.2nd indoor heat converter 132b is connected with the 2nd pipe arrangement 113b and the 3rd pipe arrangement 113c.2nd indoor heat converter 132b, when cooling operation and dehumidifying running, the evaporimeter as cold-producing medium plays a role, and cools room air; When warming operation, the condenser as cold-producing medium plays a role, and heating indoor air.In 1st indoor heat converter 132a and the 2nd indoor heat converter 132b, function during dehumidifying running is different.And dehumidifying running in this embodiment also can be described as heating and dehumidification running again.In indoor heat converter 132, such as, also can play a role as evaporimeter by making the 1st indoor heat converter 132a and the 2nd indoor heat converter 132b both sides, like this compared with when making the 1st indoor heat converter 132a play a role as condenser and make the 2nd indoor heat converter 132b play a role as evaporimeter, higher effect on moisture extraction can be obtained.But for guaranteeing higher effect on moisture extraction, if make the 1st indoor heat converter 132a and the 2nd indoor heat converter 132b both sides play a role as evaporimeter, then can because of the cooling effect of the room air brought along with dehumidification process, indoor air temperature declines too large, can bring discomfort.Therefore, in the indoor heat converter 132 of this embodiment, 1st indoor heat converter 132a is played a role as condenser and the 2nd indoor heat converter 132b is played a role as evaporimeter, its result, can be heated again by the 1st indoor heat converter 132a by the room air that the 2nd indoor heat converter 132b cools, thus it is too large that indoor air temperature can not be caused to decline, and can keep comfort.

(2-1-1-2) indoor expansion valve 133

Indoor expansion valve 133 is electric expansion valves, for adjusting in indoor refrigerant loop 113 pressure of the cold-producing medium of flowing and flow etc.Indoor expansion valve 133 comprises the 1st indoor expansion valve 133a and the 2nd indoor expansion valve 133b.1st indoor expansion valve 133a, is arranged between the tie point P1 of the 1st pipe arrangement 113a and the 3rd pipe arrangement 113c and the 1st indoor heat converter 132a in the 1st pipe arrangement 113a.2nd indoor expansion valve 133b, is arranged between tie point P1 and the 2nd indoor heat converter 132b in the 3rd pipe arrangement 113c.

(2-1-2) indoor fan

Indoor fan is disposed in the 2nd indoor unit 130.Room air sucks in the 2nd indoor unit 130 by indoor fan, and to after indoor are provided in the 1st indoor heat converter 132a and the 2nd indoor heat converter 132b and carry out heat exchange with cold-producing medium, carries out the air of heat exchange as supply air.Indoor fan is the fan that can change the air air quantity supplied to the 1st indoor heat converter 132a and the 2nd indoor heat converter 132b, such as, adopt centrifugal fan or multi blade fan.

(2-1-3) indoor unit control part 163

Fig. 7 is the control module figure of the control device 160 of conditioner 100.

Indoor unit control part 163 has CPU and memory etc., controls the action of the various machines of formation the 2nd indoor unit 130.Indoor unit control part 163, can and the remote controller (not shown) of operation needed for the 2nd indoor unit 130 between carry out the exchange of control signal etc., or and outdoor unit 120 between to carry out the exchange of control signal etc. via electric wire.

And indoor unit control part 163 is connected with various sensor.As various sensor, such as, can enumerate indoor liquid side temperature sensor 196a, 196b, Indoor Air side temperature sensor 197a, 197b and indoor temperature transmitter 198 etc.For detecting the temperature of cold-producing medium, indoor liquid side temperature sensor 196a is arranged on the hydraulic fluid side of the 1st indoor heat converter 132a.For detecting the temperature of cold-producing medium, indoor liquid side temperature sensor 196b is arranged on the hydraulic fluid side of the 2nd indoor heat converter 132b.For detecting the temperature of cold-producing medium, Indoor Air side temperature sensor 197a is arranged on the gas side of the 1st indoor heat converter 132a.For detecting the temperature of cold-producing medium, Indoor Air side temperature sensor 197b is arranged on the gas side of the 2nd indoor heat converter 132b.For detecting the temperature of the room air in inflow the 2nd indoor unit 130, namely, indoor temperature, indoor temperature transmitter 198 is arranged near the indoor air sucting inlet of the 2nd indoor unit 130.In addition, indoor liquid side temperature sensor 196a, 196b, Indoor Air side temperature sensor 197a, 197b and indoor temperature transmitter 198 are made up of thermistor.

(2-2) outdoor unit 120

Outdoor unit 120 is connected with the 1st indoor unit 30 and the 2nd indoor unit 130 by liquid phase refrigerant tube connector 151 and vapor phase refrigerant tube connector 152, forms a part for refrigerant loop 111.And outdoor unit 120 has outside refrigerant loop 112, the outdoor fan (not shown) as blower fan, the outdoor unit control part 162 of the part forming refrigerant loop 111.

(2-2-1) outside refrigerant loop 112

Outside refrigerant loop 112, mainly comprises compressor 122, the four-port conversion value 123 as switching mechanism, the outdoor heat converter 124 as heat source side heat exchanger, the outdoor expansion valve 125 as expansion mechanism, the subcooler 128 as temperature adjusting mechanism, bypass circulation 115, vapor phase refrigerant link circuit 116, the oil eliminator 121a as oily separating mechanism, the collector 121b as gas-liquid separator, hydraulic fluid side stop valve 126 and gas side stop valve 127 as the cooling source of subcooler 128.

In addition, in the following description, the part that side refrigerant loop 112 removes bypass circulation 115 and vapor phase refrigerant link circuit 116 is indoor referred to as outside main refrigerant circuit 117.One end of outside main refrigerant circuit 117 is connected with the 2nd vapor phase refrigerant tube connector 152b, and the other end is connected with liquid phase refrigerant tube connector 151.Bypass circulation 115 is connected with outside main refrigerant circuit 117, to make the part shunting being sent to the cold-producing medium of hydraulic fluid side stop valve 126 from subcooler 128, and returns to the suction side of compressor 122.Vapor phase refrigerant link circuit 116 is connected with outside main refrigerant circuit 117, to make to discharge from compressor 122, and the part flowing to the cold-producing medium of outdoor heat converter 124 is shunted and flowed to the 1st vapor phase refrigerant tube connector 152a, or make to flow through from the 1st vapor phase refrigerant tube connector 152a the suction side that the cold-producing medium come returns compressor 122.

Here, to form in the pipe arrangement of outside main refrigerant circuit 117 below, the connection waste side of compressor 122 and the pipe arrangement of the 2nd four-port conversion value 123b are referred to as to discharge pipe arrangement 117a, and the pipe arrangement connecting the suction side of the 2nd four-port conversion value 123b and compressor 122 is referred to as to suck pipe arrangement 117b.In vapor phase refrigerant link circuit 116, the connection waste side of compressor 122 and the pipe arrangement of the 1st four-port conversion value 123a are referred to as to discharge isocon 116a, the pipe arrangement connecting the 1st four-port conversion value 123a and the 1st gas side stop valve 127a is referred to as vapor phase refrigerant pipe arrangement 116b, connect the suction side of the 1st four-port conversion value 123a and compressor 122 (specifically, collector 121b) pipe arrangement be referred to as the 1st and suck return pipe 116c, connect the 1st four-port conversion value 123a and the 1st pipe arrangement sucking return pipe 116c and be referred to as the 2nd and suck return pipe 116d.Discharge isocon 116a is connected with discharge pipe arrangement 117a, flows to the 1st four-port conversion value 123a to make a part for the cold-producing medium discharged from compressor 122.Tubule 116e as the mechanism of decompressor is arranged on the 2nd and sucks on return pipe 116d.

And, in this embodiment, although outside refrigerant loop 112 comprises subcooler 128, bypass circulation 115, oil eliminator 121a and collector 121b, but the structure of outside refrigerant loop is not limited only to this, outside refrigerant loop also can be comprise compressor 122, four-port conversion value 123, outdoor heat converter 124, outdoor expansion valve 125, vapor phase refrigerant link circuit 116, hydraulic fluid side stop valve 126 and gas side stop valve 127, and does not comprise the structure of subcooler 128, bypass circulation 115, oil eliminator 121a and collector 121b.

(2-2-1-1) compressor 122

Compressor 122 is the compressor that can change running capacity, by Frequency Converter Control revolution.Compressor 122 is compressed in the cold-producing medium of flowing in refrigerant loop 111.In compressor 122 side disposed in the outdoor main refrigerant circuit 117.

(2-2-1-2) four-port conversion value 123

Four-port conversion value 123, has the 2nd four-port conversion value 123b be arranged in the 1st four-port conversion value 123a on vapor phase refrigerant link circuit 116, side disposed in the outdoor main refrigerant circuit 117.

The flow direction of the changeable cold-producing medium of the 1st four-port conversion value 123a, becomes the 1st state to make the flow direction of cold-producing medium in refrigerant loop 111 and becomes or the 2nd state.In addition, the 1st state is in this embodiment, the state that cold-producing medium flows as illustrated by arrows 5, is in the 1st vapor phase refrigerant tube connector 152a, cold-producing medium outdoor unit 120 effluent to the state of the 2nd indoor unit 130 side.Under the 1st state, high-pressure refrigerant flows to the 1st vapor phase refrigerant tube connector 152a and the 1st indoor heat converter 132a, and the 1st indoor heat converter 132a plays a role as condenser.While 1st four-port conversion value 123a connects discharge isocon 116a and gas phase refrigerant piping 116b, connect the 1st and suck return pipe 116c and the 2nd suction return pipe 116d, become the 1st state to make the refrigerant flow direction in refrigerant loop 111.

And the 2nd state in this embodiment is the state that cold-producing medium flows as indicated by the arrows in fig. 6, be cold-producing medium in the 1st vapor phase refrigerant tube connector 152a, from the state that the 2nd indoor unit 130 side direction outdoor unit 120 effluent is dynamic.Under 2nd state, refrigerant flow direction the 1st indoor heat converter 132a of low pressure and the 1st vapor phase refrigerant tube connector 152a, the 1st indoor heat converter 132a plays a role as evaporimeter.While 1st four-port conversion value 123a connects discharge isocon 116a and the 2nd suction return pipe 116d, connect vapor phase refrigerant pipe arrangement 116b and the 1st suction return pipe 116c and be connected, become the 2nd state to make the flow direction of cold-producing medium in refrigerant loop 111.

In addition, below for convenience of explanation, while connection discharge isocon 116a and gas phase refrigerant piping 116b, connect the 1st state sucking the 1st four-port conversion value 123a of return pipe 116c and the 2nd suction return pipe 116d and be referred to as the 1st switching state, while connection discharge isocon 116a and the 2nd is sucked return pipe 116d, the state connecting the 1st four-port conversion value 123a of vapor phase refrigerant pipe arrangement 116b and the 1st suction return pipe 116c is referred to as the 2nd switching state.Namely once, the state of the 1st four-port conversion value 123a is switched to the 1st switching state, and the flow direction of the cold-producing medium in refrigerant loop 111 becomes the 1st state.According to this formation, while flowing to the 1st vapor phase refrigerant tube connector 152a from the some refrigerant of compressor 122 discharge, cold-producing medium sucks between return pipe 116d at the 1st suction return pipe 116c and the 2nd and circulates.And once the state that the 1st four-way dress changes valve 123a is switched to the 2nd switching state, in refrigerant loop 111, the flow direction of cold-producing medium becomes the 2nd state.According to this formation, while being inhaled into compressor 122 from the low pressure refrigerant of the 1st vapor phase refrigerant tube connector 152a, after the some refrigerant discharged from compressor 122 is depressurized, be inhaled into compressor 122.

The flow direction of the changeable cold-producing medium flowed in liquid phase refrigerant tube connector 151 and the 2nd vapor phase refrigerant tube connector 152b of the 2nd four-port conversion value 123b.Specifically, state when state during the 2nd four-port conversion value 123b switching refrigeration/dehumidification and heating.

State during refrigeration/dehumidification, be connect the waste side of compressor 122 and the gas side of indoor heat converter 124 while, connect the state solid line of the 2nd four-port conversion value 123b (in reference Fig. 5, the Fig. 6) of the suction side of compressor 122 and the 2nd vapor phase refrigerant tube connector 152b.The state of refrigeration/dehumidification is become once the 2nd four-port conversion value 123b, in liquid phase refrigerant tube connector 151, cold-producing medium outdoor unit 120 effluent moves to the 1st indoor unit and the 2nd indoor unit 130 effluent, in the 2nd vapor phase refrigerant tube connector 152b, cold-producing medium is from the 1st indoor unit 30 and the 2nd indoor unit 130 effluent to outdoor unit 120 side.

State during heating is, while connecting waste side and the 2nd gas side stop valve 127b of compressor 122, and the state (in reference Fig. 5,6, the 2nd four-way fills the dotted line changing valve 123b) of the hydraulic fluid side of junction chamber outer heat-exchanger 124 and the suction side of compressor 122.Once the 2nd four-port conversion value 123b becomes heating state, in the 2nd vapor phase refrigerant tube connector 152b, cold-producing medium outdoor unit 120 effluent to the 1st indoor unit 30 and the 2nd indoor unit 130 side, in liquid phase refrigerant tube connector 151, cold-producing medium is from the 1st indoor unit 30 and the 2nd indoor unit 130 effluent to outdoor unit 120 side.

2nd four-port conversion value 123b is by becoming refrigeration/dehumidification state, outdoor heat converter 124 plays a role as condenser, the indoor heat converter 32 of the 1st indoor unit 30 plays a role as evaporimeter, 1st indoor heat converter 132a of the 2nd indoor unit 130 plays a role as evaporimeter or condenser, and the 2nd indoor heat converter 132b plays a role as evaporimeter.On the other hand, 2nd four-port conversion value 123b is by becoming heating state, the indoor heat converter 32 of the 1st indoor unit 30, the 1st indoor heat converter 132a of the 2nd indoor unit 130 and the 2nd indoor heat converter 132b play a role as condenser, and outdoor heat converter 124 plays a role as evaporimeter.

(2-2-1-3) outdoor heat converter 124

In this embodiment, outdoor heat converter 124 have employed fin tube type heat exchanger, wherein, described heat exchanger have such as header, shunt tubule, make header and the spaced and multiple flat tubes be connected abreast of shunting tubule.In addition, as the adopted heat exchanger of outdoor heat converter 124, being not limited only to fin tube type, such as, also can be shell-and-tube exchanger or heat-exchangers of the plate type.

Outdoor heat converter 124 is, by carrying out heat exchange with the air provided by outdoor fan 21, during cooling operation, condenser as the vapor phase refrigerant liquefaction making to flow into from header plays a role, during warming operation, as make the evaporimeter of liquid gas refrigerant vapor flowed into from shunting tubule play a role can heat exchanger.Outdoor heat converter 124, its gas side is connected with the 2nd four-port conversion value 123b, and its hydraulic fluid side is connected with outdoor expansion valve 125.

(2-2-1-4) outdoor expansion valve 125

Outdoor expansion valve 25 is refrigerant pressure in order to adjust in outside refrigerant loop 112 flowing and flow etc., the electric expansion valve be connected with the hydraulic fluid side of outdoor heat converter 124.

(2-2-1-5) hydraulic fluid side stop valve 126 and gas side stop valve 127

Hydraulic fluid side stop valve 126 is arranged on the valve on the connector of liquid phase refrigerant tube connector 151.Gas side stop valve 127 comprises the 1st gas side stop valve 127a and the 2nd gas side stop valve 127b.1st gas side stop valve 127a is arranged on the valve on the connector of the 1st vapor phase refrigerant tube connector 152a.2nd gas side stop valve 127b is arranged on the valve on the connector of the 2nd vapor phase refrigerant tube connector 152b.

(2-2-1-6) subcooler 128

Subcooler 128 is a kind of heat exchangers, makes the cold-producing medium that is condensed within the condenser carry out heat exchange with the cold-producing medium flowed in bypass circulation 115, in this embodiment, arranges to cool the cold-producing medium that is condensed in outdoor heat converter 124.Subcooler 128 comprises the 1st refrigerant pipe 128a, the 2nd refrigerant pipe 128b.One end of 1st refrigerant pipe 128a be connected subcooler 128 and be connected with the 1st pipe arrangement 117ca of outdoor expansion valve 125, the other end be connected subcooler 128 and be connected with the 2nd pipe arrangement 117d of hydraulic fluid side stop valve 126.Refrigerant flow direction the 1st refrigerant pipe 128a of flowing in the main refrigerating circuit 117 in outside.By refrigerant flow direction the 2nd refrigerant pipe 128b of bypass circulation 115.

(2-2-1-7) bypass circulation 115

Bypass circulation 115 is connected with outside main refrigerant circuit 117, with the some refrigerant shunting making expansion valve 125 outdoor be sent to hydraulic fluid side stop valve 126, and returns to the suction side of compressor 122.Bypass circulation 115 comprises isocon 115a, collecting fitting 115b.Isocon 115a is connected with the 2nd pipe arrangement 117d, to make expansion valve 125 outdoor be sent to the some refrigerant of hydraulic fluid side stop valve 126, and shunting after flowing out from the 1st refrigerant pipe 128a of subcooler 128.And, isocon 115a is provided with the colod-application expansion valve 129 of mistake as expansion mechanism.Collecting fitting 115b is connected with suction pipe arrangement 117b, with the suction side making the cold-producing medium flowed out from the 2nd refrigerant pipe 128b of subcooler 128 return compressor 122.Isocon 115a and collecting fitting 115b is connected with the 2nd refrigerant pipe 128b of subcooler 128.

Crossing colod-application expansion valve 129 is for adjusting the pressure of cold-producing medium and the electric expansion valve of flow that flow in bypass circulation 115.Cross colod-application expansion valve 129 and reduce the pressure flowing to the cold-producing medium of isocon 115a from the 2nd pipe arrangement 117d.According to this formation, via the 1st pipe arrangement 117c and the 2nd pipe arrangement 117d outdoor heat exchanger 124 be sent to the cold-producing medium of indoor expansion valve 133, in subcooler 128, crossed colod-application expansion valve 129 post-decompression refrigerant cools.

(2-2-1-8) oil eliminator 121a

In oil eliminator 121a side disposed in the outdoor main refrigerant circuit 117, for refrigeration oil contained in the cold-producing medium discharged from compressor 122 is separated from cold-producing medium.The outlet side of oil eliminator 121a is connected with tubule 121aa, the refrigeration oil be separated from cold-producing medium can be made to return suck pipe arrangement 117b in oil eliminator 121a.

(2-2-1-9) collector 121b

Collector 121b is the container of the residual refrigerant that can be collected in refrigerant loop 111.In outside main refrigerant circuit 117, collector 121b is connected between the 2nd four-port conversion value 123b and compressor 122.Residual refrigerant is variation of operating load due to the 1st indoor unit 30 and the 2nd indoor unit 130 etc. and occurs.Collector 121b is separated liquid phase refrigerant and vapor phase refrigerant, and only vapor phase refrigerant is sucked in compressor 122.

(2-2-2) outdoor fan

Outdoor fan is used for suction chamber outer air in outdoor unit 120, and makes after outdoor air and cold-producing medium carry out heat exchange, to carry out the air after heat exchange to outdoor discharge in outdoor heat converter 124.Outdoor fan is the fan that can change the air air quantity provided to outdoor heat converter 124, such as, adopts propeller type fan etc.

(2-2-3) outdoor unit control part 162

Outdoor unit control part 162 has CPU and memory etc., controls the action of the various machines forming outdoor unit 120.

And indoor unit control part 162 is connected with various sensor.As various sensor, such as, comprise suction pressure sensor 190, discharge pressure sensor 192, inlet temperature sensor 193a, discharge temperature sensor 193b, outdoor heat converter temperature sensor 194, bypass temperature sensor 199 and outdoor temperature sensor 195.Suction pressure sensor 190 is the sensors of the suction pressure detecting compressor 122, is arranged between the 2nd four-port conversion value 123b and the suction side of compressor 122.Discharge pressure sensor 192 is the sensors of the blowdown presssure detecting compressor 122, is arranged between the 2nd four-port conversion value 123b and the waste side of compressor 122.Inlet temperature sensor 193a is the sensor of the inlet temperature detecting compressor 122, is arranged between the 2nd four-port conversion value 123b and the suction side of compressor 122.Discharge temperature sensor 193b is the sensor of the exhaust temperature detecting compressor 122, is arranged between the 2nd four-port conversion value 123b and the waste side of compressor 122.Outdoor heat converter temperature sensor 194 is the sensors of the refrigerant temperature detecting flowing in outdoor heat converter 124, on heat exchanger 124 disposed in the outdoor.Bypass temperature sensor 199 is the sensors of the outlet side refrigerant temperature being detected cooler 128 the 2nd refrigerant pipe 128b, is arranged on collecting fitting 115b.Outdoor temperature sensor 195 is the sensors of the temperature detecting the outdoor air flowed in outdoor unit 120, near the suction inlet of unit 120 disposed in the outdoor.In this embodiment, suction pressure sensor 190, discharge pressure sensor 192, inlet temperature sensor 193a, discharge temperature sensor 193b, outdoor heat converter temperature sensor 194, bypass temperature sensor 199 and outdoor temperature sensor 195 etc., be made up of thermistor.

In addition, the exchange of control signal etc. is carried out between outdoor unit control part 162 and indoor unit control part 63 and indoor unit control part 163 via transmission line.Namely the control device 160 of the running control carrying out conditioner 100 entirety, is made up of unit controls portion 63 and the transmission line between indoor unit control part 163 and outdoor unit control part 162 in indoor unit control part 63, indoor unit control part 163, outdoor unit control part 162, junction chamber.In other words, controlled the various machines of outdoor unit 120, the 1st indoor unit 30 and the 2nd indoor unit 130 by control device 160, conditioner 100 carries out the various runnings of dehumidifying running, cooling operation and warming operation etc.In addition, when carrying out various running in conditioner 100, according to the operating load of the 1st indoor unit 30 and the 2nd indoor unit 130, control the various machines of outdoor unit 120, the 1st indoor unit 30 and the 2nd indoor unit 130.

Next, to dehumidifying running, cooling operation and warming operation time the control content of control device 160 carry out example explanation.

During dehumidifying running, the 1st four-port conversion value 123a is in the 1st switching state represented by solid line of Fig. 5, and the 2nd four-port conversion value 123b becomes the refrigeration/dehumidification state represented by solid line of Fig. 5.And outdoor expansion valve 125 is in full open state, hydraulic fluid side stop valve 126 and gas side stop valve 127 are in opening.The indoor expansion valve 33 of the 1st indoor unit 30 carries out degree of superheat control, target superheat degree is reached to make the refrigerant superheat degree of indoor heat converter 32 outlet side, and the 2nd indoor expansion valve 133b of the 2nd indoor unit 130 carries out degree of superheat control, reach target superheat degree to make the refrigerant superheat degree of the 2nd indoor heat converter 132b outlet side.1st indoor expansion valve 133a of the 2nd indoor unit 130 carries out degree of subcooling control, reaches target degree of subcooling to make the cold-producing medium degree of subcooling of the 1st indoor heat converter 132a outlet side.Supercooling expansion valve 129 carries out degree of superheat control, reaches target superheat degree with the degree of superheat of the outlet side cold-producing medium making subcooler 128 the 2nd refrigerant pipe 128b.

Under the state of this refrigerant loop 111, once start compressor 122, outdoor fan and indoor fan 31, the vapor phase refrigerant of low pressure, by being inhaled into compressor 122 and being compressed, becomes the vapor phase refrigerant of high pressure.And the partial gas phase cold-producing medium of high pressure, flows to outdoor heat converter 124 from discharge pipe arrangement 117a via the 2nd four-port conversion value 123b, and remainder flows to the 1st four-port conversion value 123a from discharge isocon 116a.

Flow through discharge isocon 116a, and arrive the high-pressure refrigerant of the 1st four-port conversion value 123a, via the 1st gas side stop valve 127a, in the 1st vapor phase refrigerant tube connector 152a, unit 120 effluent, to the 2nd indoor unit 130 side, and flows into the 1st pipe arrangement 113a outdoor.Flow into the high-pressure refrigerant of the 1st pipe arrangement 113a, in the 1st indoor heat converter 132a, carry out heat exchange and condensation with the room air provided by indoor fan, become the liquid phase refrigerant of high pressure.The liquid phase refrigerant of this high pressure is depressurized by during the 1st indoor expansion valve 113a, and collaborates via tie point P1 and the cold-producing medium flowed in the 3rd pipe arrangement 113c.

On the other hand, flow to the high-pressure refrigerant of indoor heat converter 124, carry out heat exchange and condensation with the outdoor air provided by outdoor fan, become the liquid phase refrigerant of high pressure.This high pressure liquid phase refrigerant, by outdoor expansion valve 125, flows through the 1st pipe arrangement 117c, flows into the 1st refrigerant pipe 128a of subcooler 128.Flow into the cold-producing medium of the 1st refrigerant pipe 128a, carry out heat exchange with the cold-producing medium of the 2nd refrigerant pipe 128b flowing into subcooler 128 and be cooled, after becoming supercooling state, in the 2nd pipe arrangement 117d, flowing to hydraulic fluid side stop valve 126.The high-pressure refrigerant flowed in the 2nd pipe arrangement 117d, its part flows to liquid phase refrigerant tube connector 151 via hydraulic fluid side stop valve 126, and remainder flows to the shunting pipe arrangement 115a of bypass circulation 115.Flow to the high-pressure refrigerant of the shunting pipe arrangement 115a of bypass circulation 115, after colod-application expansion valve 129 reduces pressure into the gas-liquid two-phase cold-producing medium of low pressure excessively, flow into the 2nd refrigerant pipe 128b of subcooler 128.Flow into the cold-producing medium of the 2nd refrigerant pipe 128b of subcooler 128, flow through collecting fitting 115b, and to collaborate sucking the cold-producing medium flowed in pipe arrangement 117b.On the other hand, arrive the high-pressure refrigerant of liquid phase refrigerant tube connector 151, unit 120 effluent is to the 1st indoor unit 30 and the 2nd indoor unit 130 side outdoor.

Be sent to the high pressure liquid phase refrigerant of the 1st indoor unit 30, reduced pressure into the cold-producing medium of gas-liquid two-phase state of low pressure by indoor expansion valve 33 after, inflow indoor heat exchanger 32.The cold-producing medium of the gas-liquid two-phase state of inflow indoor heat exchanger 32, carries out heat exchange with room air and evaporates, becoming the vapor phase refrigerant of low pressure in indoor heat converter 32.And the vapor phase refrigerant of this low pressure, flows through the 2nd vapor phase refrigerant tube connector 152b and is sent to outdoor unit 120.

Be sent to the high pressure liquid phase refrigerant of the 2nd indoor unit 130, flow to the 3rd pipe arrangement 113c, after collaborating with the cold-producing medium flowing through the 1st pipe arrangement 113a in tie point P1, arrive the 2nd indoor expansion valve 133b.Arrive the cold-producing medium of the 2nd indoor expansion valve 133b, reduced pressure into the cold-producing medium of gas-liquid two-phase state of low pressure by the 2nd indoor expansion valve after, flow into the 2nd indoor heat converter 132b.Flow into the cold-producing medium of the gas-liquid two-phase of the 2nd indoor heat converter 132b, in the 2nd indoor heat converter 132b, carry out heat exchange with room air and evaporate, becoming the vapor phase refrigerant of low pressure.And the vapor phase refrigerant of this low pressure, flows through the 2nd vapor phase refrigerant tube connector 152b and is sent to outdoor unit 120.

Flow through the low-pressure vapor phase cold-producing medium that the 2nd vapor phase refrigerant tube connector 152b is sent to outdoor unit 120, via the 2nd gas side stop valve 127b and the 2nd four-port conversion value 123b, flow through in the way sucking pipe arrangement 117b and be again inhaled in compressor 122 via collector 121b.

During cooling operation, the 1st four-port conversion value 123a becomes the 2nd switching state represented by solid line of Fig. 6, and the 2nd four-port conversion value 123b becomes the refrigeration/dehumidification state represented by solid line of Fig. 6.And outdoor expansion valve 125 helps opening, hydraulic fluid side stop valve 126 and gas side stop valve 127 are in opening.The indoor expansion valve 33 of the 1st indoor unit 30 carries out degree of superheat control, reaches target superheat degree to make the refrigerant superheat degree of indoor heat converter 32 outlet side.1st indoor expansion valve 133a of the 2nd indoor unit 130 carries out degree of superheat control, reaches target superheat degree to make the refrigerant superheat degree of the 1st indoor heat converter 132a outlet side.2nd indoor expansion valve 133b of the 2nd indoor unit 130 carries out degree of superheat control, reaches target superheat degree to make the refrigerant superheat degree of the 2nd indoor heat converter 132b outlet side.Cross colod-application expansion valve 129 and carry out degree of superheat control, reach target superheat degree with the refrigerant superheat degree of the 2nd refrigerant pipe 128b outlet side making subcooler 128.

Under the state of this refrigerant loop 111, once start compressor 122, outdoor fan and indoor fan 31, the vapor phase refrigerant of low pressure, by being inhaled into compressor 122 and being compressed, becomes the vapor phase refrigerant of high pressure.Further, the vapor phase refrigerant of partial high pressure, flows to outdoor heat converter 124 from discharge pipe arrangement 117a via the 2nd four-port conversion value 123b, and remainder flows to the 1st four-port conversion value 123a from discharge isocon 116a.

Flow through the high-pressure refrigerant that discharge isocon 116a arrives the 1st four-port conversion value 123a, after being depressurized when sucking the tubule 116e of return pipe 116d by the 2nd, and sucking the 1st the cold-producing medium flowed in return pipe 116c and collaborate.

On the other hand, flow to the high-pressure refrigerant of outdoor heat converter 124, carry out heat exchange and condensation with the outdoor air provided by outdoor fan, become the liquid phase refrigerant of high pressure.This high pressure liquid phase refrigerant, flows through the 1st pipe arrangement 117c by outdoor expansion valve 125, flows into the 1st refrigerant pipe 128a of subcooler 128.Flow into the cold-producing medium of the 1st refrigerant pipe 128a, carry out heat exchange with the cold-producing medium of the 2nd refrigerant pipe 128b flowing into subcooler 128 and be cooled, after becoming supercooled state, in the 2nd pipe arrangement 117d, flowing to hydraulic fluid side stop valve 126.The high-pressure refrigerant flowed in the 2nd pipe arrangement 117d, its part flows to liquid phase refrigerant tube connector 151 via hydraulic fluid side stop valve 126, and remainder flows to the shunting pipe arrangement 115a of bypass circulation 115.Flow to the high-pressure refrigerant of the shunting pipe arrangement 115a of bypass circulation 115, crossed colod-application expansion valve 129 and reduce pressure, after becoming the cold-producing medium of gas-liquid two-phase state of low pressure, flow into the 2nd refrigerant pipe 128b of subcooler 128.Flow into the cold-producing medium of the 2nd refrigerant pipe 128b of subcooler 128, flow through collecting fitting 115b, and to collaborate sucking the cold-producing medium flowed in pipe arrangement 117b.On the other hand, arrive the high-pressure refrigerant of liquid phase refrigerant tube connector 151, unit 120 effluent is to the 1st indoor unit 30 and the 2nd indoor unit 130 side outdoor.

Be sent to the high pressure liquid phase refrigerant of the 1st indoor unit 30, after being become the cold-producing medium of the gas-liquid two-phase of low pressure by indoor expansion valve 33 decompression, in inflow indoor heat exchanger 32.The cold-producing medium of the gas-liquid two-phase state of inflow indoor heat exchanger 32, carries out heat exchange with room air and evaporates, becoming the vapor phase refrigerant of low pressure in indoor heat converter 32.Further, the vapor phase refrigerant of this low pressure, flows through the 2nd vapor phase refrigerant tube connector 152b, is sent to outdoor unit 120.

Be sent to the high pressure liquid phase refrigerant of the 2nd indoor unit 130, flow through the 3rd pipe arrangement 113c, its part flows into the 1st pipe arrangement 113a via tie point P1 and arrives the 1st indoor expansion valve 133a, and remainder arrives the 2nd indoor expansion valve 133b.

Arrive the liquid phase refrigerant of the 1st indoor expansion valve 133a, reduced pressure by the 1st indoor expansion valve 133a, after becoming the cold-producing medium of gas-liquid two-phase state of low pressure, flow into the 1st indoor heat converter 132a.Flow into the cold-producing medium of the gas-liquid two-phase state of the 1st indoor heat converter 132a, in the 1st indoor heat converter 132a, carry out heat exchange with room air and evaporate, becoming the vapor phase refrigerant of low pressure.And the vapor phase refrigerant of this low pressure, flows through the 1st vapor phase refrigerant tube connector 152a and is sent to outdoor unit 120.

Flow through the 1st vapor phase refrigerant tube connector 152a and be sent to the low-pressure vapor phase cold-producing medium of outdoor unit 120, flowing through vapor phase refrigerant pipe arrangement 116b via the 1st gas side stop valve 127a, arriving the 1st four-port conversion value 123a.Arrive the low-pressure vapor phase cold-producing medium of the 1st four-port conversion value 123a, flow through the 1st and suck in the way of return pipe 116c, and suck after the cold-producing medium flowed in return pipe 116d collaborates the 2nd, and to collaborate sucking the cold-producing medium flowed in pipe arrangement 117b.

Arrive the liquid phase refrigerant of the 2nd indoor expansion valve 133b, after being become the cold-producing medium of gas-liquid two-phase state of low pressure by the 2nd indoor expansion valve 133b decompression, flow into the 2nd indoor heat converter 132b.Flow into the cold-producing medium of the gas-liquid two-phase state of the 2nd indoor heat converter 132b, in the 2nd indoor heat converter 132b, carry out heat exchange with room air and evaporate, becoming the vapor phase refrigerant of low pressure.Further, the vapor phase refrigerant of this low pressure, flows through the 2nd vapor phase refrigerant tube connector 152b and is sent to outdoor unit 120.

Flow through the 2nd vapor phase refrigerant tube connector 152b and be sent to the low-pressure vapor phase cold-producing medium of outdoor unit 120, via the 2nd gas side stop valve 127b and the 2nd four-port conversion value 123b, flow through in the way sucking pipe arrangement 117b with sucks from the 1st the cold-producing medium that return pipe 116c flows through and collaborates.Afterwards, via collector 121b, be inhaled in compressor 122 at this.

During warming operation, such as, the 1st four-port conversion value 123a is in the 1st switching state represented by solid line of Fig. 5, and the 2nd four-port conversion value 123b is in the heating state represented by dotted line of Fig. 5 and Fig. 6.And outdoor expansion valve 125 carries out degree of superheat control, to make the refrigerant superheat degree of outdoor heat converter 124 outlet side reach target superheat degree, hydraulic fluid side stop valve 126 and gas side stop valve 127 are in opening.The indoor expansion valve 33 of the 1st indoor unit 30 is controlled, and reaches regulation degree of supercooling to make the cold-producing medium degree of supercooling of indoor heat converter 32 outlet side.1st indoor expansion valve 133a of the 2nd indoor unit 130 is controlled, with the degree of supercooling making the cold-producing medium degree of supercooling of the 1st indoor heat converter 132a outlet side reach regulation.2nd indoor expansion valve 133b of the 2nd indoor unit 130 is controlled, with the degree of supercooling making the cold-producing medium degree of supercooling of the 2nd indoor heat converter 132b outlet side reach regulation.Cross colod-application expansion valve 129 one-tenth full closing state.

Under the state of this refrigerant loop 111, once start compressor 122, outdoor fan and indoor fan 31, the vapor phase refrigerant of low pressure, by being inhaled into compressor 122 and being compressed, becomes the vapor phase refrigerant of high pressure.And the vapor phase refrigerant of high pressure, flow through discharge pipe arrangement 117a, its part arrives the 2nd four-port conversion value 123b, and remainder flows to the 1st four-port conversion value 123a from discharge isocon 116a.

Flow through the high-pressure refrigerant that discharge isocon 116a arrives the 1st four-port conversion value 123a, via the 1st gas side stop valve 127a, in the 1st vapor phase refrigerant tube connector 152a, unit 120 effluent, to the 2nd indoor unit 130 side, flows into the 1st pipe arrangement 113a outdoor.Flow into the high-pressure refrigerant of the 1st pipe arrangement 113a, carry out heat exchange and condensation with the room air provided by indoor fan, become the liquid phase refrigerant of high pressure.The liquid phase refrigerant of this high pressure, is depressurized by during the 1st indoor expansion valve 133a, collaborates via tie point P1 and the cold-producing medium flowed in the 3rd pipe arrangement 113c.

On the other hand, arrive the high pressure vapor cold-producing medium of the 2nd four-port conversion value 123b, arrive the 2nd vapor phase refrigerant tube connector 152b via the 2nd gas side stop valve 127b.Arrive the high pressure vapor cold-producing medium of the 2nd vapor phase refrigerant tube connector 152b, unit 120 effluent is to the 1st indoor unit 30 and the 2nd indoor unit 130 side outdoor.

Be sent to the high pressure vapor refrigerant flow direction indoor heat converter 32 of the 1st indoor unit 30, in indoor heat converter 32, carry out heat exchange and condensation with the room air provided by indoor fan, become the liquid phase refrigerant of high pressure.The liquid phase refrigerant of this high pressure, by being depressurized during indoor expansion valve 33, from the 1st indoor unit 30 effluent to outdoor unit 120 side in liquid phase refrigerant tube connector 151.

Be sent to the high pressure vapor cold-producing medium of the 2nd indoor unit 130, flow through the 2nd pipe arrangement 113b and arrive the 2nd indoor heat converter 132b.Arrive the high pressure vapor cold-producing medium of the 2nd indoor heat converter 132b, in the 2nd indoor heat converter 132b, carry out heat exchange and condensation with the room air provided by indoor fan, become the liquid phase refrigerant of high pressure.The liquid phase refrigerant of this high pressure, after being depressurized during the 2nd indoor expansion valve 133b, by collaborating, from the 2nd indoor unit 130 effluent to outdoor unit 120 side in liquid phase refrigerant tube connector 151 with the cold-producing medium flowed in the 1st pipe arrangement 113a during tie point P1.

Flow through the liquid phase refrigerant that liquid phase refrigerant tube connector 151 is sent to outdoor unit 120, flow through the 2nd pipe arrangement 117d, the 1st refrigerant pipe 128a, the 1st pipe arrangement 117c successively via hydraulic fluid side stop valve 126, arrive outdoor expansion valve 125.Arrive the liquid phase refrigerant of outdoor expansion valve 125, reduced pressure by outdoor expansion valve 125, after becoming the cold-producing medium of gas-liquid two-phase state of low pressure, inflow outdoor heat exchanger 124.The cold-producing medium of the gas-liquid two-phase state of inflow outdoor heat exchanger 124, carries out heat exchange with outdoor air and evaporates, becoming the vapor phase refrigerant of low pressure in outdoor heat converter 124.And the vapor phase refrigerant of this low pressure, via the 2nd four-port conversion value 123b, to flow through in the way sucking pipe arrangement 117b via collector 121b, is again inhaled in compressor 122.

In addition, control device 160 has enforcement division 161.Below, enforcement division 161 is described.

(2-2-3-1) enforcement division 161

Enforcement division 161 performs the 1st and controls and the 2nd control.1st controls and the 2nd controls to refer to, in the operation process of conditioner 100, and control performed when switching the flowing to of cold-producing medium in refrigerant loop 111.In this embodiment, the flow direction operating at cold-producing medium in refrigerant loop 111 of conditioner 100 be the 1st state dehumidifying running and in refrigerant loop 111 flow direction of cold-producing medium be the 2nd state cooling operation between when switching, perform the 1st and control and the 2nd to control.Specifically, when the running of conditioner 100 switches to cooling operation from dehumidifying running, perform the 2nd and control.And, when the running of conditioner 100 switches to dehumidifying running from cooling operation, perform the 1st and control.Further, in the 1st controls and the 2nd controls, the action of the 1st four-port conversion value 123a and compressor 122 is controlled by control device 160.

In addition, dehumidifying running with the switching of cooling operation is, such as, carries out when having the running switching instruction via remote controller.

Further, here, the 1st four-port conversion value 123a becomes the 1st switching state, and when compressor 122 drives with the revolution exceeding target revolution, is referred to as dehumidifying running.And the 1st four-port conversion value 123a becomes the 2nd switching state, and when driving compressor 122, be referred to as cooling operation.In addition, the 1st control and the 2nd control starting point and terminating point on, carry out the control of any one movement content of change the 1st four-port conversion value 123a and compressor 122.

In controlling the 1st, switch the state of the 1st four-port conversion value 123a, become the 1st state to make the flow direction of cold-producing medium in refrigerant loop 111 from the 2nd state.Specifically, in controlling the 1st, the state of the 1st four-port conversion value 123a switches to the 1st switching state from the 2nd switching state.And, the 1st control in, switch the 1st four-port conversion value 123a state before, control compressor 122 with make the revolution of compressor 122 be not less than execution the 2nd control time revolution.In addition, in the 1st of this embodiment controls, control compressor 122 to make compressor 122 revolution before and after the state of switching the 1st four-port conversion value 123a constant.Namely, in the 1st control, the movement content of compressor 122 does not change, and carries out the control of the movement content only changing the 1st four-port conversion value 123a.Further, in the 1st of this embodiment controls, when running content switches to dehumidifying running from cooling operation, maintain the revolution of compressor 122 when cooling operation stops.

In controlling the 2nd, the state of the 1st four-port conversion value 123a is switched to the 2nd switching state from the 1st switching state, becomes the 2nd state to make the flow direction of cold-producing medium in refrigerant loop 111 from the 1st state.And, in controlling the 2nd, before switching the state of the 1st four-port conversion value 123a, control compressor 122 and reduce to make the revolution of compressor 122.In addition, in the 2nd of this embodiment controls, control compressor 122, to make it stop before the state of switching the 1st four-port conversion value 123a, afterwards, control compressor 122, be periodically increased to regulation revolution to make its revolution.That is, in controlling the 2nd, the movement content of compressor 122 is repeatedly changed, and the movement content of four-port conversion value 123 is also changed.

As mentioned above, in controlling the 2nd, the revolution of compressor 122 is temporarily reduced, while making it increase afterwards, switch the state of the 1st four-port conversion value 123a.On the other hand, in controlling the 1st, switch the state of four-port conversion value 123, with make the revolution of compressor 122 be not less than the 2nd control time revolution.Therefore, start the time that the 1st controls execution the 1st control extremely needed for termination, control to the time of execution the 2nd control needed for termination short than beginning the 2nd.

And, in this embodiment, when conditioner 100 carries out dehumidifying running, namely, when the flow direction of cold-producing medium is the 1st state in refrigerant loop 111, high-pressure refrigerant flows to the 1st indoor heat converter 132a, and low pressure refrigerant flows to the 2nd indoor heat converter 132b.On the other hand, when conditioner 100 carries out cooling operation, namely, when the flow direction of cold-producing medium is the 2nd state in refrigerant loop 111, low pressure refrigerant flows to the 1st indoor heat converter 132a and the 2nd indoor heat converter 132b.Therefore, control once perform the 2nd, and the refrigerant flow direction in refrigerant loop 111 is switched to the 2nd state from the 1st state, be provided to the cold-producing medium of the 1st indoor heat converter 132a, namely, the cold-producing medium that flows in the 1st indoor heat converter 132a, convert low pressure refrigerant to from high-pressure refrigerant.And, control once perform the 1st, and the flow direction of cold-producing medium is switched to the 1st state from the 2nd state in refrigerant loop 111, be provided to the cold-producing medium of the 1st indoor heat converter 132a, namely, the cold-producing medium that flows in the 1st indoor heat converter 132a, convert high-pressure refrigerant to from low pressure refrigerant.

(3) feature

（3-1）

In this embodiment, switch the state of the 1st four-port conversion value 123a, perform when the 2nd state becomes the 1st state to make the flow direction of cold-producing medium in refrigerant loop 111 the 1st time of implementation controlled, than the state of switching the 1st four-port conversion value 123a, the perform when the 1st state becomes the 2nd state to make the flow direction of cold-producing medium in refrigerant loop 111 the 2nd time of implementation controlled is short.Therefore, can shorten when switching the flowing to of cold-producing medium in refrigerant loop 111, between the dehumidifying running namely, in conditioner 10 and cooling operation, switch required time when operating.And, even if running ability with in order to switch cold-producing medium in refrigerant loop 111 flow to that required time is proportional to be reduced time, the reduction of running ability when execution the 1st can be suppressed compared with when controlling with execution the 2nd to control.According to this formation, running ability when switching the flowing to of cold-producing medium in refrigerant loop 111 can be reduced and decline.

（3-2）

This embodiment the 1st control in, switch the 1st four-port conversion value 123a state before control compressor 122, with make the revolution of compressor 122 be not less than execution the 2nd control time revolution.Therefore, compared with when controlling with execution the 2nd, when execution the 1st can be suppressed to control, running ability reduces.

And, in the 1st of this embodiment controls, control compressor 122 to make the revolution of the compressor 122 before and after the state of switching the 1st four-port conversion value 123a constant, in controlling the 2nd, control compressor 122, stopped before the state of switching the 1st four-port conversion value 123a to make it.Therefore, compared with when controlling with execution the 2nd, the reduction of running ability when can prevent execution the 1st from controlling and switch the flowing to of cold-producing medium.According to this formation, the phenomenon because of compressor 122 stopping obstruction comfortableness can be suppressed.

Also have, as the present embodiment, in the Mobyneb conditioner 100 that multiple indoor unit is connected with an outdoor unit 120, state once switching the 1st four-port conversion value 123a that operates to carry out dehumidifying in the 2nd indoor unit 130 controls, to make the driving of compressor 122 always temporarily stop, then can become large to the impact of the 1st indoor unit 30.In this embodiment, control owing to running content being carried out the 1st when cooling operation switches to dehumidifying running in the 2nd indoor unit, the impact on the 1st indoor unit 30 can be reduced.

（3-3）

In this embodiment, perform the 2nd and control, namely, the cold-producing medium that flows in the 1st indoor heat converter 132a is when switching to low pressure refrigerant from high-pressure refrigerant, and before switching the state of the 1st four-port conversion value 123a, the revolution of compressor 122 stops.Therefore, the switching sound during state of switching the 1st four-port conversion value 123a can be reduced.

And in this embodiment, when performing the 1st control, the revolution of the compressor 122 before and after the state of switching the 1st four-port conversion value 123a does not change.But, during due to the cold-producing medium flowed in the 1st indoor heat converter 132a is switched to high-pressure refrigerant from low pressure refrigerant, even if switch the state of the 1st four-port conversion value 123a, do not reduce to make the revolution of compressor 122, switch sound low, therefore, control even if perform the 1st, namely, by the cold-producing medium flowed in the 1st indoor heat converter 132a switch to high-pressure refrigerant from low pressure refrigerant, switching sound can be reduced.

Therefore, even if carry out the 1st to control and the 2nd any one control controlled, namely, the running of conditioner 100 any one occasion when switching to cooling operation from dehumidifying running and when switching to dehumidifying running from cooling operation, the switching sound during state of switching the 1st four-port conversion value 123a can be reduced.

(4) flexible example

(4-1) flexible routine 2A

In addition to the above embodiments, when switching the running of conditioner 100 between warming operation and reverse cycle defrosting operate, also can perform the 1st and control and the 2nd control.Specifically, when the running of conditioner 100 switches to reverse cycle defrosting running from warming operation, perform the 2nd and control, when the running of conditioner 100 switches to warming operation from reverse cycle defrosting running, also can perform the 1st and control.

In addition, in this flexible example, in order to switch warming operation and reverse cycle defrosting operate and switch the state of the 2nd four-port conversion value 123b time, also can perform the 1st and control and the 2nd control.Specifically, when the state of the 2nd four-port conversion value 123b switches to refrigeration/dehumidification state from heating state, perform the 2nd and control; When switching to heating state from refrigeration/dehumidification state, perform the 1st and control.

(4-2) flexible routine 2B

In addition to the above embodiments, as shown in Figure 8, the source pump 180 with water heat exchanger 181 can also be comprised.In water heat exchanger 181, by making to carry out heat exchange between the water that flows in 181a in water pipe and the high pressure vapor cold-producing medium flowing to refrigerant pipe 181b from the 1st vapor phase refrigerant tube connector 152a, heat the water flowed in water pipe 181a.By the water heated in water heat exchanger 181, be stored in boiler (not shown).In refrigerant pipe 181b, carried out the cold-producing medium of heat exchange, after being reduced pressure by the heat pump expansion valve 182 as expansion mechanism, with in liquid phase refrigerant tube connector 151 outdoor unit 120 effluent collaborate to the liquid phase refrigerant of the 1st indoor unit 30 side.

(4-3) flexible routine 2C

In the above-described embodiments, when the running of conditioner 100 switches to cooling operation from dehumidifying running, the 2nd must be performed and control, and when the running of control and regulation device 100 switches to dehumidifying running from cooling operation, the 1st must be performed and control.

Replace aforesaid operations, when the running of conditioner 100 is switched to cooling operation from dehumidifying running, according to the pressure of the cold-producing medium flowed in the 1st indoor heat converter 132a, also can judge that execution the 1st controls and the 2nd any one control controlled.Such as, when the running of conditioner 100 switches to cooling operation from dehumidifying running, when the pressure of the cold-producing medium flowed in the 1st indoor heat converter 132a exceedes authorized pressure, carry out the 2nd and control, during not enough authorized pressure, perform the 1st and control.And, when the running of conditioner 100 switches to dehumidifying running from cooling operation, during the insufficient pressure authorized pressure of the cold-producing medium flowed in the 1st indoor heat converter 132a, perform the 1st and control, when exceeding authorized pressure, carry out the 2nd and control.

INDUSTRIAL APPLICABILITY

The present invention can reduce the device that running ability declines when being flowing to of switching cold-producing medium, can effectively be applicable to the refrigerating plant comprising switching mechanism.

Claims (6)

1. a refrigerating plant (10,100), it comprises: the refrigerant loop (11,111) being connected range site (30,130) and heat source unit (20,120) by tube connector (51,52,151,152), wherein,

Described heat source unit, comprising:

Switching mechanism (23,123a), the flow direction of changeable cold-producing medium, becomes the 1st state or the 2nd state to make the flow direction of cold-producing medium in described refrigerant loop; And

Control part (61,161), performing the 1st and controls and the 2nd control, by controlling described switching mechanism in controlling, making the flow direction of cold-producing medium in described refrigerant loop become described 1st state from described 2nd state the described 1st; By controlling described switching mechanism in controlling the described 2nd, the flow direction of cold-producing medium in described refrigerant loop is made to become described 2nd state from described 1st state,

It is characterized in that,

And from the described 1st control to terminate described 1st control needed for the 1st control the time of implementation, than from start the described 2nd control to terminate described 2nd control needed for the 2nd control the time of implementation short.

2. refrigerating plant according to claim 1, is characterized in that,

Described heat source unit also comprises compressor (22,122), and this compressor is for being compressed in the cold-producing medium flowed in described refrigerant loop;

Described control part controls described compressor,

In controlling the described 2nd, before the described switching mechanism of control, the revolution of described compressor is reduced;

In controlling the described 1st, control to make before described switching mechanism the revolution of described compressor be no less than the described 2nd control time revolution.

3. refrigerating plant according to claim 2, is characterized in that,

Control described compressor in controlling the described 2nd, stopped before the described switching mechanism of control to make described compressor;

Control described compressor in controlling the described 1st, do not change to make the front and back that the revolution of described compressor is controlling described switching mechanism.

4. the refrigerating plant according to Claims 2 or 3, is characterized in that,

Described range site comprises and utilizes side heat exchanger (32,132a);

Under described 1st state, high-pressure refrigerant flows to and describedly utilizes side heat exchanger;

Under described 2nd state, low pressure refrigerant flows to and describedly utilizes side heat exchanger.

5. refrigerating plant according to claim 4, is characterized in that,

Described heat source unit has the heat source side heat exchanger (24,124) played a role as condenser or evaporimeter;

Using running from when making described heat source side heat exchanger switch to as the warming operation that evaporimeter plays a role the reverse cycle defrosting running making described heat source side heat exchanger play a role as condenser, perform the described 2nd and control;

When running is switched to described warming operation from described reverse cycle defrosting running, perform the described 1st and control.

6. the refrigerating plant according to any one of claim 1 to 5, is characterized in that,

Described range site, comprising:

1st utilizes side heat exchanger (123a), plays a role as condenser or evaporimeter;

2nd utilizes side heat exchanger (123b), plays a role as condenser or evaporimeter, and is different from the described 1st and utilizes side heat exchanger;

The described 1st is made to utilize side heat exchanger to play a role as condenser from making the described 1st to utilize side heat exchanger and the described 2nd to utilize side heat exchanger to switch to as the cooling operation that evaporimeter plays a role running, and during the dehumidifying running making the described 2nd to utilize side heat exchanger to play a role as evaporimeter, perform the described 1st and control;

When running is switched to described cooling operation from described dehumidifying running, perform the described 2nd and control.