JP4736727B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump hot water supply apparatus including a fluid conveyance device in which a compressor and an expander are rotationally driven by the same rotation shaft.

In the past, an invention of “a refrigeration apparatus using a fluid conveyance device in which a compressor and an expander are connected by the same rotating shaft” has been disclosed (for example, see Patent Documents 1 and 2).
JP 2002-22298 A JP 2001-66006 A JP 2004-309045 A

  By the way, in such a fluid conveyance device, the flow rate ratio (volume ratio) between the compressor and the expander is uniquely determined. For this reason, if the outside air temperature around the fluid transfer device changes, the amount of refrigerant flowing into the expander may be excessive or insufficient. Here, if the amount of the refrigerant flowing into the expander is too small, the power recovery efficiency in the expander is lowered and the energy efficiency is deteriorated. On the other hand, if the amount of refrigerant flowing into the expander is excessive, the compressor is operating wastefully, resulting in energy loss.

  An object of the present invention is to effectively use energy in a heat pump water heater using a fluid conveyance device in which a compressor and an expander are connected by the same rotating shaft.

The heat pump hot water supply apparatus according to the first aspect of the present invention includes a first fluid transfer device, a first refrigerant circuit, and a second refrigerant circuit. The first fluid conveyance device has a first compression unit and a first expansion unit. The 1st expansion part is connected with the axis of rotation of the 1st compression part. The 1st refrigerant circuit has connected the 1st compression part, the 1st radiator, the expansion valve, and the 1st evaporator one by one. The 2nd refrigerant circuit has connected the compressor, the 2nd heat radiator, the 1st expansion part, and the 2nd evaporator one by one. The frequency of the first fluid transfer device is controlled so as to be lower than that of the compression device when it is lower than the predetermined outside air temperature, and higher than that of the compression device when it is higher than the predetermined outside air temperature. .

  In this heat pump hot water supply device, the first expansion portion is connected to the rotation shaft of the first compression portion. And the 1st refrigerant circuit has connected the 1st compression part, the 1st radiator, the expansion valve, and the 1st evaporator one by one. Moreover, the 2nd refrigerant circuit has connected the compressor, the 2nd heat radiator, the 1st expansion part, and the 2nd evaporator in order. For this reason, in this heat pump hot-water supply apparatus, in the 2nd refrigerant circuit, the 1st expansion part and compression device of the 1st fluid conveyance device can be controlled independently. Therefore, in this heat pump hot water supply device, it is possible to prevent the amount of refrigerant flowing into the expander from being excessive or insufficient. As a result, in this heat pump hot water supply apparatus, energy can be used effectively.

A heat pump hot water supply apparatus according to the second invention is the heat pump hot water supply apparatus according to the first invention, and the compression device is rotationally driven at a constant speed. The first compression unit and the first expansion unit are inverter-controlled.

In this heat pump hot water supply device, the compression device is rotationally driven at a constant speed, and the first compression unit and the first expansion unit are inverter-controlled. For this reason, in this heat pump hot-water supply apparatus, the refrigerant | coolant circulation amount of a compression apparatus and the 1st expansion part of a fluid conveyance apparatus is match | combined optimally, and power recovery can be efficiently performed in the 1st expansion part of a fluid conveyance apparatus. Moreover, in this heat pump hot-water supply apparatus, an inverter circuit becomes unnecessary in a compression apparatus. Therefore, this heat pump hot water supply apparatus can be manufactured at low cost.

  In the heat pump hot water supply apparatus according to the first aspect of the present invention, in the second refrigerant circuit, the first expansion section and the compression apparatus of the first fluid conveyance device can be controlled independently. Therefore, in this heat pump hot water supply device, it is possible to prevent the amount of refrigerant flowing into the expander from being excessive or insufficient. As a result, in this heat pump hot water supply apparatus, energy can be used effectively.

In the heat pump hot water supply device according to the second aspect of the invention, the refrigerant circulation amount between the compression device and the first expansion portion of the fluid conveyance device is optimally matched, and power can be efficiently recovered at the first expansion portion of the fluid conveyance device . . Moreover, in this heat pump hot-water supply apparatus, an inverter circuit becomes unnecessary in a compression apparatus. Therefore, this heat pump hot water supply apparatus can be manufactured at low cost.

<First Embodiment>
Here, the heat pump hot-water supply apparatus 1 which concerns on 1st Embodiment of this invention is demonstrated using FIG.

[Configuration of heat pump water heater]
As shown in FIG. 1, the heat pump hot water supply apparatus 1 according to the first embodiment of the present invention mainly includes a heat pump unit 10, a hot water storage tank unit 30, and a communication water pipe 51 that connects these units 10 and 30. 52.

  Hereinafter, the heat pump unit 10 and the hot water storage tank unit 30 will be described in detail.

(1) Heat pump unit In the heat pump unit 10, the refrigerant circuit 11 as shown in FIG. 1 is formed. As shown in FIG. 1, the refrigerant circuit 11 includes a main refrigerant circuit 12, a bypass pipe 13, and an injection pipe 14. In the refrigerant circuit 11 according to the first embodiment, CO2 (carbon dioxide) is enclosed as a refrigerant, and the refrigerant circuit 11 is controlled so that CO2 becomes a supercritical pressure on the high pressure side.

  As shown in FIG. 1, the main refrigerant circuit 12 mainly includes an expansion compressor 16, a compressor 15, a water heat exchanger 17, an air heat exchanger 20, and their devices 15, 16, 17, and 20. It consists of connecting refrigerant pipes 24A, 24B, 24C, and 24D for pipe connection.

  The expansion compressor 16 mainly includes a scroll compression mechanism 16A that compresses refrigerant, a scroll expansion mechanism 16B that expands refrigerant, and an electric motor (not shown) that drives the scroll compression mechanism 16A and the scroll expansion mechanism 16B. ) Is housed. The scroll compression mechanism 16A and the scroll expansion mechanism 16B are connected by a single rotating shaft 16C that is driven to rotate by an electric motor. That is, in the expansion compressor 16, the scroll compression mechanism 16A and the scroll expansion mechanism 16B are always driven at the same rotational speed. Since the expansion compressor 16 is not equipped with an inverter circuit, the electric motor always rotates at a constant speed. The scroll compression mechanism 16A has a discharge side connected to the inlet side of the water heat exchanger 17 via the first connection refrigerant pipe 24A, and a suction side connected to the air heat exchanger 20 via the fourth connection refrigerant pipe 24D. It is connected to the exit side. The scroll expansion mechanism 16B has an inflow side connected to the outlet side of the water heat exchanger 17 via the second connection refrigerant pipe 24B, and an outflow side connected to the inlet of the air heat exchanger 20 via the third connection refrigerant pipe 24C. Connected to the side. Here, the first connecting refrigerant pipe 24A and the fourth connecting refrigerant pipe 24D are branch pipes as shown in FIG.

  The compressor 15 is an inverter-controllable scroll compressor, and, like the scroll-type compression mechanism 16A of the expansion compressor 16, the discharge side is connected to the inlet of the water heat exchanger 17 via the first connection refrigerant pipe 24A. The suction side is connected to the outlet side of the air heat exchanger 20 via the fourth connection refrigerant pipe 24D. That is, in the main refrigerant circuit 12, the compressor 15 and the scroll compression mechanism 16A of the expansion compressor 16 are in a parallel relationship.

  The water heat exchanger 17 mainly includes a water jacket (not shown) and a plurality of folded heat transfer tubes (not shown) arranged in the water jacket. The water jacket has an inlet side connected to the first water pipe 25 and an outlet side connected to the second water pipe 26. Further, the heat transfer pipe is connected to the suction side of the scroll type compression mechanism 16A of the expansion compressor 16 and the suction side of the compressor 15 via the first connection refrigerant pipe 24A, and the outlet side is connected to the second connection refrigerant pipe. It is connected to the inflow side of the scroll type expansion mechanism 16B of the expansion compressor 16 via 24B. And in this water heat exchanger 17, the high temperature supercritical refrigerant | coolant which the water or warm water which flows in into a water jacket from the 1st water piping 25 flows into a heat exchanger tube through 24 A of 1st connection refrigerant | coolants piping from a compressor, and The supercritical refrigerant flowing in the heat transfer tube is cooled at the same time as heat is exchanged to form hot water (hot water). Then, the hot water (hot water) that has finished heat exchange with the supercritical refrigerant flows into the second water pipe 26 after that.

  The air heat exchanger 20 is a cross fin and tube type heat exchanger, and the inlet side is connected to the outflow side of the scroll type expansion mechanism 16B of the expansion compressor 16 via the third connection refrigerant pipe 24C. The outlet side is connected to the suction side of the compression mechanism 16A of the expansion compressor 16 and the suction side of the compressor 15 via the fourth connection refrigerant pipe 24D. In the air heat exchanger 20, the supercritical refrigerant decompressed by the scroll type expansion mechanism 16B exchanges heat with the air blown by the fan 21 to become a gas refrigerant, and at the same time, the air is cooled. As shown in FIG. 1, the fan 21 is mainly composed of an impeller 22 and a fan motor 23, and exhibits an air blowing function when the impeller 22 is rotationally driven by the fan motor 23. .

  As shown in FIG. 1, the bypass pipe 13 is a pipe that branches from the second connection refrigerant pipe 24 </ b> B and merges with the third connection refrigerant pipe 24 </ b> C, and is on the outlet side of the heat transfer pipe of the water heat exchanger 17. And the inlet side of the air heat exchanger 20 are connected. The bypass pipe 13 is provided with a first refrigerant amount adjustment valve (electronic expansion valve) 18 that adjusts the flow rate of the supercritical refrigerant passing through the bypass pipe 13.

  As shown in FIG. 1, the injection pipe 14 is between the branch point of the bypass pipe 13 in the second connection refrigerant pipe 24 </ b> B and the inlet (not shown) of the scroll type expansion mechanism 16 </ b> B of the expansion compressor 16. This is a pipe that branches off from this part and joins in the middle of the expansion process of the scroll type expansion mechanism 16B. The injection pipe 14 is provided with a second refrigerant amount adjustment valve 19 that adjusts the flow rate of the supercritical refrigerant passing through the injection pipe 14.

  The electric motor of the compressor 15 and the electric motor of the expansion compressor 16 are communicatively connected to a control device (not shown) so as to be centrally controlled.

  The heat pump unit 10 is installed outdoors.

(2) Hot Water Storage Tank Unit As shown in FIG. 1, the hot water storage tank unit 30 mainly includes a hot water storage tank 31, a water pump 32, and a plurality of water pipes 33, 34, 35, and 36.

  The hot water storage tank 31 is connected to a third water pipe 34 for supplying water or hot water stored in the hot water storage tank 31 to the water jacket of the water heat exchanger 17 of the heat pump unit 10, and A hot water or hot water flowing out from the water jacket of the water heat exchanger 17 is connected to a fourth water pipe 33 for returning the hot water or hot water to the hot water storage tank 31. Here, the third water pipe 34 extends from the lower part of the hot water storage tank 31, and the fourth water pipe 33 extends from the upper part of the hot water storage tank 31. The third water pipe 34 is connected to the first water pipe 25 via the first connection water pipe 51, and the fourth water pipe 33 is connected to the second water pipe 26 via the second connection water pipe 52. Yes. The hot water storage tank 31 is connected to a hot water supply pipe 35 for supplying water from the outside to the hot water storage tank 31 and also connected to a hot water supply pipe 36 for supplying hot water or hot water to the dwelling unit. . Here, the water supply pipe 35 extends from the lower part of the hot water storage tank 31, and the hot water supply pipe 36 extends from the upper part of the hot water storage tank 31. In addition, a temperature sensor (not shown) is inserted in the hot water storage tank 31. When the signal value of the temperature sensor falls below a predetermined threshold value (set hot water temperature), the heat pump unit 10 and the water pump 32 are operated. It has become.

  The water pump 32 is provided in the third water pipe 34 and serves as a drive source for supplying water or hot water stored in the hot water storage tank 31 to the water jacket of the water heat exchanger 17 of the heat pump unit 10.

[Operation control of heat pump water heater]
The heat pump hot water supply apparatus 1 according to the first embodiment of the present invention differs in operation control depending on factors such as the outside air temperature. Hereinafter, as a guide, operation control of the heat pump water heater 1 in the intermediate period, summer period, and winter period will be described.

(1) Intermediate period In the intermediate period, the first refrigerant quantity adjustment valve 18 and the second refrigerant quantity adjustment valve 19 are closed.

  When the compressor 15 and the expansion compressor 16 start operating in this state, the gas refrigerant is sucked into the scroll type compression mechanism 16A of the compressor 15 and the expansion compressor 16 and compressed, It becomes a critical state, is sent to the heat transfer pipe of the water heat exchanger 17 through the first connecting refrigerant pipe 24A, and is cooled by exchanging heat with water or hot water flowing through the water jacket of the water heat exchanger 17. That is, at this time, the water or hot water flowing through the heat transfer tube is heated to become hot hot water (hot water). The hot hot water (hot water) is sent to the hot water storage tank 31 by the water pump 32. When the hot water (hot water) sent to the hot water storage tank 31 does not reach the set hot water temperature, the hot water (hot water) is further sent to the water heat exchanger 17 by the water pump 32. Conversely, when the hot water (hot water) sent to the hot water storage tank 31 reaches the set hot water temperature, the compressor 15, the expansion compressor 16, and the water pump 32 are stopped.

  Then, the cooled supercritical refrigerant is sent to the scroll expansion mechanism 16B of the expansion compressor 16 through the second connection refrigerant pipe 24B, and is supplied to the air heat exchanger 20 after being depressurized. It is evaporated by exchanging heat with the blown air to become a gas refrigerant.

  Then, the gas refrigerant passes through the fourth connection refrigerant pipe 24 </ b> D and is again sucked into the scroll compression mechanism 16 </ b> A of the compressor 15 and the expansion compressor 16. In the intermediate period, the boiling operation of the water in the hot water storage tank 31 is performed in this way.

(2) Summer In the summer, the first refrigerant quantity adjustment valve 18 is opened, and the second refrigerant quantity adjustment valve 19 is closed. Note that the opening degree of the first refrigerant quantity adjustment valve 18 is determined based on the outside air temperature, the temperature of water flowing into the water heat exchange 17 or the temperature of the hot water, and the like.

  When the compressor 15 and the expansion compressor 16 start operating in this state, the gas refrigerant is sucked into the scroll type compression mechanism 16A of the compressor 15 and the expansion compressor 16 and compressed, It becomes a critical state, is sent to the heat transfer pipe of the water heat exchanger 17 through the first connecting refrigerant pipe 24A, and is cooled by exchanging heat with water or hot water flowing through the water jacket of the water heat exchanger 17. That is, at this time, the water or hot water flowing through the heat transfer tube is heated to become hot hot water (hot water). In addition, about the flow of this high temperature warm water (hot water), since it is the same as an interim period, description is abbreviate | omitted.

  The cooled supercritical refrigerant is sent to the scroll expansion mechanism 16B of the expansion compressor 16 through the second connection refrigerant pipe 24B, and a part of the supercritical refrigerant passes through the bypass pipe 13 to adjust the first refrigerant amount. Sent to valve 18. The supercritical refrigerants sent to the scroll type expansion mechanism 16B and the first refrigerant quantity adjustment valve 18 of the expansion compressor 16 are reduced in pressure and then merged and sent to the air heat exchanger 20. The supercritical refrigerant sent to the air heat exchanger 20 is evaporated by exchanging heat with the air blown from the fan 21 to become a gas refrigerant.

  Then, the gas refrigerant passes through the fourth connection refrigerant pipe 24 </ b> D and is again sucked into the scroll compression mechanism 16 </ b> A of the compressor 15 and the expansion compressor 16. In the summer, the water boiling operation in the hot water storage tank 31 is performed in this manner.

(3) Winter In the winter, the first refrigerant quantity adjustment valve 18 is closed and the second refrigerant quantity adjustment valve 19 is opened. The opening degree of the second refrigerant quantity adjustment valve 19 is determined based on the outside air temperature, the change in the temperature of water flowing into the water heat exchanger 17 and the temperature of hot water, and the like.

  When the compressor 15 and the expansion compressor 16 start operating in this state, the gas refrigerant is sucked into the scroll type compression mechanism 16A of the compressor 15 and the expansion compressor 16 and compressed, It becomes a critical state, is sent to the heat transfer pipe of the water heat exchanger 17 through the first connecting refrigerant pipe 24A, and is cooled by exchanging heat with water or hot water flowing through the water jacket of the water heat exchanger 17. That is, at this time, the water or hot water flowing through the heat transfer tube is heated to become hot hot water (hot water). In addition, about the flow of this high temperature warm water (hot water), since it is the same as an interim period, description is abbreviate | omitted.

  The cooled supercritical refrigerant is sent to the scroll expansion mechanism 16B of the expansion compressor 16 through the second connection refrigerant pipe 24B, and a part of the cooled supercritical refrigerant passes through the injection pipe 14 and is scrolled. And is sent to the air heat exchanger 20 after being decompressed together. The supercritical refrigerant sent to the air heat exchanger 20 is evaporated by exchanging heat with the air blown from the fan 21 to become a gas refrigerant.

  Then, the gas refrigerant passes through the fourth connection refrigerant pipe 24 </ b> D and is again sucked into the scroll compression mechanism 16 </ b> A of the compressor 15 and the expansion compressor 16. In winter, the water in the hot water storage tank 31 is heated in this way.

[Features of heat pump water heater]
(1)
In the heat pump hot water supply apparatus 1 according to the present embodiment, the scroll compression mechanism 16A of the expansion compressor 16 and the compressor 15 are connected by piping in parallel. For this reason, in this heat pump hot water supply device 1, the cylinder volume of the compressor 15, the cylinder volume of the scroll type compression mechanism 16 </ b> A, and the suction volume of the scroll type expansion mechanism 16 </ b> B are optimized. The electric motor of the compressor 15 and the expansion compressor 16 take into account the suction gas density of the scroll compression mechanism 16A due to the temperature change of the inflowing water or hot water, the refrigerant density at the outlet side of the heat transfer tube of the water heat exchanger 17, and the like. The number of rotations of the electric motor can be determined for each. Therefore, in this heat pump hot water supply device 1, it is possible to prevent the amount of refrigerant flowing into the scroll type expansion mechanism 16B from being excessive or insufficient. As a result, the heat pump hot water supply apparatus 1 can effectively use energy.

(2)
In the heat pump hot water supply apparatus 1 according to the present embodiment, the scroll compression mechanism 16A and the scroll expansion mechanism 16B are rotationally driven at a constant speed, and the compressor 15 is inverter-controlled. For this reason, in this heat pump hot-water supply apparatus 1, an inverter circuit is unnecessary for the expansion compressor 16. Therefore, this heat pump hot-water supply apparatus 1 can be manufactured at low cost.

(3)
In heat pump hot water supply apparatus 1 according to the present embodiment, bypass pipe 13 and first refrigerant amount adjustment valve 18 are attached to main refrigerant circuit 12. For this reason, in this heat pump hot water supply device 1, when the amount of refrigerant flowing into the scroll type expansion mechanism 16B is excessive, the amount of refrigerant can be optimized, and as a result, the cylinder volume of the compressor 15 and the scroll type compression mechanism. The determination of the cylinder volume of 16A, the suction volume of the scroll type expansion mechanism 16B, etc. can be widened.

(4)
In the heat pump hot water supply apparatus 1 according to the present embodiment, an injection pipe 14 and a second refrigerant amount adjustment valve 19 are attached to the main refrigerant circuit 12. For this reason, in this heat pump hot water supply device 1, when the amount of the refrigerant flowing into the scroll type expansion mechanism 16B is too small, the amount of the refrigerant can be optimized. As a result, the cylinder volume of the compressor 15, the scroll type compression mechanism The determination of the cylinder volume of 16A, the suction volume of the scroll type expansion mechanism 16B, etc. can be widened.

[Modification]
(A)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the expansion compressor 16 equipped with the scroll type compression mechanism 16A is employed, but instead, other types of compression such as a rotary type and a swing type are used. An expansion compressor equipped with a mechanism may be adopted.

(B)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the expansion compressor 16 equipped with the scroll type expansion mechanism 16B is employed, but instead, other types of expansion such as a rotary type and a swing type are employed. An expansion compressor equipped with a mechanism may be adopted.

(C)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the electric motor of the expansion compressor 16 is operated at a constant speed, but the electric motor of the expansion compressor 16 may be inverter-controlled.

  In such a case, the number of rotations of both motors is adjusted by the control device.

(D)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the scroll type compressor 15 is employed. However, instead of this, other types of compressors such as a rotary type and a swing type may be employed. .

(E)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the injection pipe 14 and the second refrigerant amount adjustment valve 19 are attached to the main refrigerant circuit 12, but instead, the suction side and expansion of the compressor 15 are expanded. An expansion valve may be provided on at least one of the suction side of the scroll type compression mechanism 16A of the compressor 16. Alternatively, an expansion valve may be provided in a portion before the first connecting refrigerant pipe 24A branches.

(F)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the bypass pipe 13 and the first refrigerant quantity adjustment valve 18, the injection pipe 14 and the second refrigerant quantity adjustment valve 19 are attached to the main refrigerant circuit 12. The cylinder volume of the machine 15, the cylinder volume of the scroll type compression mechanism 16A, and the suction volume of the scroll type expansion mechanism 16B are optimized, and further, the scroll is caused by changes in the outside air temperature and the temperature of water or hot water flowing into the water heat exchanger 17. If the rotational speeds of the motor of the compressor 15 and the motor of the expansion compressor 16 are determined in consideration of the intake gas density of the compression mechanism 16A, the refrigerant density at the outlet side of the heat transfer tube of the water heat exchanger 17, etc. Bypass pipe 13 and first refrigerant quantity control valve 18, injection pipe 14 and second refrigerant quantity control valve 19 It is also possible to omit.

(G)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the bypass pipe 13 and the first refrigerant quantity adjustment valve 18, the injection pipe 14 and the second refrigerant quantity adjustment valve 19 are attached to the main refrigerant circuit 12. The cylinder volume of the machine 15, the cylinder volume of the scroll type compression mechanism 16A, and the suction volume of the scroll type expansion mechanism 16B are optimized, and further, the scroll is caused by changes in the outside air temperature and the temperature of water or hot water flowing into the water heat exchanger 17. If the rotational speeds of the motor of the compressor 15 and the motor of the expansion compressor 16 are determined in consideration of the intake gas density of the compression mechanism 16A, the refrigerant density at the outlet side of the heat transfer tube of the water heat exchanger 17, etc. It is also possible to omit only the bypass pipe 13 and the first refrigerant quantity adjustment valve 18.

(H)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the bypass pipe 13 and the first refrigerant quantity adjustment valve 18, the injection pipe 14 and the second refrigerant quantity adjustment valve 19 are attached to the main refrigerant circuit 12. The cylinder volume of the machine 15, the cylinder volume of the scroll type compression mechanism 16A, and the suction volume of the scroll type expansion mechanism 16B are optimized, and further, the scroll is caused by changes in the outside air temperature and the temperature of water or hot water flowing into the water heat exchanger 17. If the rotational speeds of the motor of the compressor 15 and the motor of the expansion compressor 16 are determined in consideration of the intake gas density of the compression mechanism 16A, the refrigerant density at the outlet side of the heat transfer tube of the water heat exchanger 17, etc. It is also possible to omit only the injection pipe 14 and the second refrigerant quantity adjustment valve 19.

(I)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, CO2 (carbon dioxide) is enclosed as a refrigerant in the refrigerant circuit 11, but this refrigerant may be a refrigerant such as a chlorofluorocarbon, ammonia, or hydrocarbon. . However, in such a case, the water heat exchanger 17 functions not as a gas cooler but as a condenser.

(J)
In the heat pump hot water supply apparatus 1 according to the previous embodiment, the water pump 32 is provided in the hot water storage tank unit 30, but the water pump 32 may be provided in the heat pump unit 10.

Second Embodiment
Here, the heat pump hot-water supply apparatus 2 which concerns on 2nd Embodiment of this invention is demonstrated using FIG.

[Configuration of heat pump water heater]
As shown in FIG. 2, the heat pump hot water supply apparatus 2 according to the second embodiment of the present invention mainly includes a heat pump unit 110, a hot water storage tank unit 30, and a communication water pipe 151 that connects these units 30 and 110. It is comprised from 152. In addition, since the hot water storage tank unit according to the present embodiment is the same as the hot water storage tank unit 30 according to the first embodiment, the same reference numerals are given and description thereof is omitted.

  Hereinafter, the heat pump unit 110 and the connection mode between the heat pump unit 110 and the hot water storage tank unit 30 will be described in detail.

(1) Heat Pump Unit In the heat pump unit 110, two refrigerant circuits 111A and 111B as shown in FIG. 2 are formed. Hereinafter, the refrigerant circuit labeled 111A is referred to as a first refrigerant circuit, and the refrigerant circuit labeled 111B is referred to as a second refrigerant circuit. Note that CO2 (carbon dioxide) is sealed as a refrigerant in the first refrigerant circuit 111A and the second refrigerant circuit 111B according to the second embodiment, and in these refrigerant circuits 111A and 111B, CO2 is supercritical on the high pressure side. Controlled to be pressure.

  As shown in FIG. 2, the first refrigerant circuit 111 </ b> A mainly includes a compressor 115, a first water heat exchanger 17, an expansion compressor 116, a first air heat exchanger 20, and their devices 115 and 116. , 17 and 20 are connected refrigerant pipes 124A, 124B, 124C and 124D. Note that the first water heat exchanger and the first air heat exchanger according to the present embodiment are the same as the water heat exchanger 17 and the air heat exchanger 20 according to the first embodiment, and thus are denoted by the same reference numerals. The description is omitted. Further, in the present embodiment, the fan that blows air to the air heat exchanger 20 is the same as the fan 21 according to the first embodiment, so the same reference numerals are given and the description thereof is omitted.

  The compressor 115 is a scroll compressor operated at a constant speed, the discharge side being connected to the inlet side of the heat transfer tube of the first water heat exchanger 17 via the fifth connection refrigerant pipe 124A, and the suction side being the first. It is connected to the outlet side of the first air heat exchanger 20 via an 8-connection refrigerant pipe 124D.

  Similarly to the expansion compressor 16 according to the first embodiment, the expansion compressor 116 includes a scroll type compression mechanism 16A that compresses the refrigerant, a scroll type expansion mechanism 16B that expands the refrigerant, and the scroll type compression mechanism 16A and the scroll type. An electric motor (not shown) that drives the expansion mechanism 16B is accommodated. As with the expansion compressor 16 according to the first embodiment, the scroll type compression mechanism 16A and the scroll type expansion mechanism 16B are connected by a single rotary shaft 16C that is rotationally driven by an electric motor. That is, in this expansion compressor 116, like the expansion compressor 16 according to the first embodiment, the scroll compression mechanism 16A and the scroll expansion mechanism 16B are always driven at the same rotational speed. The expansion compressor 116 is equipped with an inverter circuit, and the expansion compressor 116 can change the rotation speed of the electric motor by the inverter circuit. In this embodiment, only the scroll type expansion mechanism 16B of the expansion compressor 116 is connected to the first refrigerant circuit 111A. Incidentally, in the present embodiment, the scroll type expansion mechanism 16B has the inflow side connected to the outlet side of the heat transfer tube of the first water heat exchanger 17 via the sixth connection refrigerant pipe 124B, and the outflow side connected to the seventh connection refrigerant. It is connected to the inlet side of the first air heat exchanger 20 via a pipe 124C.

  As shown in FIG. 2, the second refrigerant circuit 111B mainly includes an expansion compressor 116, a second water heat exchanger 17, an electronic expansion valve 118, a second air heat exchanger 20, and their devices 17, The connecting refrigerant pipes 224A, 224B, 224C, and 224D connect the pipes 20, 116, and 118. Since the second water heat exchanger and the second air heat exchanger according to the present embodiment are the same as the water heat exchanger 17 and the air heat exchanger 20 according to the first embodiment, the same reference numerals are given. The description is omitted. Further, in the present embodiment, the fan that blows air to the air heat exchanger 20 is the same as the fan 21 according to the first embodiment, so the same reference numerals are given and the description thereof is omitted.

  In the present embodiment, only the scroll compression mechanism 16A of the expansion compressor 116 is connected to the second refrigerant circuit 111B. Incidentally, in the present embodiment, the scroll compression mechanism 16A has a discharge side connected to the inlet side of the heat transfer pipe of the second water heat exchanger 17 via a ninth connection refrigerant pipe 224A, and a suction side connected to the twelfth connection refrigerant. It is connected to the outlet side of the first air heat exchanger 20 via the pipe 224D.

  The electronic expansion valve 118 is for depressurizing the refrigerant flowing from the second water heat exchanger 17, and the inlet side is connected to the outlet side of the heat transfer tube of the second water heat exchanger 17, and the outlet side is the first. Two air heat exchangers 20 are connected to the inlet side.

  The heat pump unit 110 is installed outdoors.

  The heat pump unit 110 is designed so that the rotation speed of the motor of the expansion compressor 116 is the same as the rotation speed of the motor of the compressor 115 in the intermediate period. Further, when the outside air temperature is lower than the outside air temperature assumed in the intermediate period (when the intake gas density is reduced), the heat pump unit 110 is provided with the motor of the expansion compressor 116 in order to match the refrigerant circulation amount. Designed so that the number of revolutions is lower than the number of revolutions of the motor of the compressor 115. On the other hand, when the outside air temperature becomes higher than the outside temperature assumed in the intermediate period (when the intake gas density becomes large). ), The rotational speed of the motor of the expansion compressor 116 is designed to be higher than the rotational speed of the motor of the compressor 115 in order to match the refrigerant circulation amount.

  The electric motor of the compressor 115 and the electric motor of the expansion compressor 116 are connected to a control device (not shown) so as to be centrally controlled.

(2) Connection Mode of Heat Pump Unit 110 and Hot Water Storage Tank Unit 30 The third water pipe 34 of the hot water storage tank unit 30 is connected to the first water heat exchanger 17 and the second of the heat pump unit 110 via the third connection water pipe 151. The first water pipe 25 extending from the water jacket inlet of the water exchanger 17 is connected. Further, the fourth water pipe 33 of the hot water storage tank unit 30 extends from the outlets of the water jackets of the first water heat exchanger 17 and the second water exchanger 17 of the heat pump unit 110 via the fourth connection water pipe 152. The second water pipe 26 is connected. Here, the third connecting water pipe 151 and the fourth connecting water pipe 152 are branch pipes as shown in FIG.

[Operation of heat pump water heater]
When the compressor 15 and the expansion compressor 16 start operation, the first refrigerant circuit 111A enters the supercritical state after the gas refrigerant is sucked into the compressor 115 and compressed, and the fifth connection refrigerant pipe It is sent to the heat transfer tube of the first water heat exchanger 17 through 124A, and is cooled by exchanging heat with water or hot water flowing through the water jacket of the first water heat exchanger 17. On the other hand, in the second refrigerant circuit 111B, after the gas refrigerant is sucked into the scroll compression mechanism 16A of the expansion compressor 116 and compressed, it enters a supercritical state and passes through the ninth connection refrigerant pipe 224A. It is sent to the heat transfer tube of the water heat exchanger 17 and is cooled by exchanging heat with water or hot water flowing through the water jacket of the second water heat exchanger 17. That is, at this time, the water or hot water flowing through the heat transfer tubes of the first water heat exchanger 17 and the second water heat exchanger 17 is heated to become hot hot water (hot water). The hot hot water (hot water) is sent to the hot water storage tank 31 by the water pump 32. If the hot water (hot water) sent to the hot water storage tank 31 does not reach the set hot water temperature, the hot water (hot water) is further supplied by the water pump 32 to the first water heat exchanger 17 and the second water heat exchanger. 17 will be sent. On the contrary, when the hot water (hot water) sent to the hot water storage tank 31 reaches the set hot water temperature, the compressor 115, the expansion compressor 116, and the water pump 32 are stopped.

  In the first refrigerant circuit 111A, the cooled supercritical refrigerant is sent to the scroll type expansion mechanism 16B of the expansion compressor 116 through the sixth connection refrigerant pipe 124B, and after the pressure is reduced, the first air heat exchange is performed. The refrigerant is evaporated by exchanging heat with the air supplied to the vessel 20 and blown from the first fan 21 to become a gas refrigerant. On the other hand, in the second refrigerant circuit 111B, the cooled supercritical refrigerant is sent to the electronic expansion valve 118 through the tenth connection refrigerant pipe 224B, and is supplied to the second air heat exchanger 20 after being decompressed. The gas refrigerant is evaporated by exchanging heat with the air blown from the second fan 21.

  In the first refrigerant circuit 111A, the gas refrigerant that has flowed out of the first air heat exchanger 17 is again sucked into the compressor 115 through the eighth connection refrigerant pipe 124D. On the other hand, in the second refrigerant circuit 111B, the gas refrigerant flowing out from the second air heat exchanger 17 passes through the twelfth connection refrigerant pipe 224D and is again sucked into the scroll compression mechanism 16A of the expansion compressor 116. .

  In this manner, the water heating operation in the hot water storage tank 31 is performed.

[Features of heat pump water heater]
(1)
In the heat pump hot water supply apparatus 2 according to the present embodiment, the first refrigerant circuit 111A includes the compressor 115, the first water heat exchanger 17, the scroll expansion mechanism 16B of the expansion compressor 116, and the first air heat exchanger 20. The second refrigerant circuit 111B sequentially connects the scroll compression mechanism 16A of the expansion compressor 116, the second water heat exchanger 17, the electronic expansion valve 118, and the second air heat exchanger 20. It has become. For this reason, in this heat pump hot water supply device 2, in the first refrigerant circuit 111A, the scroll type expansion mechanism 16B of the expansion compressor 116 and the compressor 115 can be controlled independently. Therefore, in this heat pump hot water supply device 2, it is possible to prevent an excess or deficiency in the amount of refrigerant flowing into the scroll type expansion mechanism 16B. As a result, the heat pump hot water supply apparatus 2 can effectively use energy.

(2)
In heat pump hot water supply apparatus 2 according to the present embodiment, the electric motor of compressor 115 is rotationally driven at a constant speed, and the electric motor of expansion compressor 116 is inverter-controlled. For this reason, in this heat pump hot water supply device 2, the refrigerant circulation amount between the compressor 115 and the scroll type expansion mechanism 16B of the expansion compressor 116 is optimally adjusted, and the power is efficiently recovered by the scroll type expansion mechanism 16B of the expansion compressor 116. It can be performed. Further, in the heat pump hot water supply device 2, an inverter circuit is not necessary for the compressor 115. Therefore, this heat pump hot water supply apparatus 2 can be manufactured at low cost.

[Modification]
(A)
In the heat pump hot water supply apparatus 2 according to the previous embodiment, the expansion compressor 116 on which the scroll type compression mechanism 16A is mounted is adopted. However, instead of this, other types of compression such as a rotary type and a swing type are used. An expansion compressor equipped with a mechanism may be adopted.

(B)
In the heat pump hot water supply apparatus 2 according to the previous embodiment, the expansion compressor 116 having the scroll type expansion mechanism 16B is employed, but instead, other types of expansion such as a rotary type and a swing type are used. An expansion compressor equipped with a mechanism may be adopted.

(C)
In the heat pump hot water supply apparatus 2 according to the previous embodiment, the electric motor of the compressor 115 is operated at a constant speed, but the electric motor of the compressor 115 may be inverter-controlled.

  In such a case, the number of rotations of both motors is adjusted by the control device.

(D)
In the heat pump hot water supply apparatus 2 according to the previous embodiment, the scroll type compressor 115 is employed. However, instead of this, another type of compressor such as a rotary type or a swing type may be employed. .

(E)
In the heat pump hot water supply apparatus 2 according to the previous embodiment, CO2 (carbon dioxide) is sealed as a refrigerant in the first refrigerant circuit 111A and the second refrigerant circuit 111B. It can be used as a refrigerant such as hydrogen. However, in this case, the first water heat exchanger 17 and the second water heat exchanger 17 function not as a gas cooler but as a condenser.

<Third Embodiment>
Here, the heat pump hot-water supply apparatus 3 which concerns on 3rd Embodiment of this invention is demonstrated using FIG.

[Configuration of heat pump water heater]
As shown in FIG. 3, the heat pump hot water supply device 3 according to the third embodiment of the present invention mainly includes a first heat pump unit 310A, a second heat pump unit 310B, a hot water storage tank unit 30, and these units 30, 310A. , 310B are connected to water pipes 351, 352 for connection. In addition, since the hot water storage tank unit according to the present embodiment is the same as the hot water storage tank unit 30 according to the first embodiment, the same reference numerals are given and description thereof is omitted. In the present embodiment, a combination of the first heat pump unit 310A and the second heat pump unit 310B is referred to as a heat pump unit 310.

  Hereinafter, the first heat pump unit 310A, the second heat pump unit 310B, and the connection mode between the first heat pump unit 310A and the second heat pump unit 310B and the hot water storage tank unit 30 will be described in detail.

(1) First Heat Pump Unit In the first heat pump unit 310A, a third refrigerant circuit 311A as shown in FIG. 3 is formed. The third refrigerant circuit 311A contains CO2 (carbon dioxide) as a refrigerant, and the third refrigerant circuit 311A is controlled so that CO2 becomes a supercritical pressure on the high pressure side.

  As shown in FIG. 3, the third refrigerant circuit 311 </ b> A mainly includes a compressor 15, a third water heat exchanger 17, an electronic expansion valve 118, a third air heat exchanger 20, and devices 15 and 17 thereof. , 20 and 118 are connected refrigerant pipes 324A, 324B, 324C and 324D. The compressor, the third water heat exchanger, and the third air heat exchanger according to the present embodiment are the same as the compressor 15, the water heat exchanger 17, and the air heat exchanger 20 according to the first embodiment. Since they are the same, the same reference numerals are given and description thereof is omitted. Further, in the present embodiment, the fan that blows air to the air heat exchanger 20 is the same as the fan 21 according to the first embodiment, so the same reference numerals are given and the description thereof is omitted. Moreover, since the electronic expansion valve according to the present embodiment is the same as the electronic expansion valve 118 according to the second embodiment, the same reference numerals are given and description thereof is omitted.

  In the third refrigerant circuit 311A, the discharge side of the compressor 15 is connected to the inlet side of the heat transfer tube of the third water heat exchanger 17 via the thirteenth connection refrigerant pipe 324A, and the third water heat exchanger 17 is connected. The outlet side of the heat transfer tube is connected to the inlet side of the electronic expansion valve 118 via the fourteenth connection refrigerant pipe 324B, and the outlet side of the electronic expansion valve 118 is connected to the third air heat exchanger via the fifteenth connection refrigerant pipe 324C. 20 is connected to the inlet side, and the outlet side of the third air heat exchanger 20 is connected to the suction side of the compressor 15 via the sixteenth connecting refrigerant pipe 324D.

  The first heat pump unit 310A is installed outdoors.

(2) Second Heat Pump Unit In the second heat pump unit 310B, a fourth refrigerant circuit 311B as shown in FIG. 3 is formed. The fourth refrigerant circuit 311B contains CO2 (carbon dioxide) as a refrigerant, and the fourth refrigerant circuit 311B is controlled so that CO2 becomes a supercritical pressure on the high-pressure side.

  As shown in FIG. 3, the fourth refrigerant circuit 311 </ b> B mainly pipes the expansion compressor 116, the fourth water heat exchanger 17, the fourth air heat exchanger 20, and their devices 17, 20, 116. The connecting refrigerant pipes 424A, 424B, 424C, and 424D are connected. In addition, since the expansion compressor which concerns on this Embodiment is the same as the expansion compressor 116 which concerns on 2nd Embodiment, it attaches | subjects the same code | symbol and abbreviate | omits description. In addition, the fourth water heat exchanger and the fourth air heat exchanger according to the present embodiment are the same as the water heat exchanger 17 and the air heat exchanger 20 according to the first embodiment, and thus are denoted by the same reference numerals. The description is omitted. Further, in the present embodiment, the fan that blows air to the air heat exchanger 20 is the same as the fan 21 according to the first embodiment, so the same reference numerals are given and the description thereof is omitted.

  In the fourth refrigerant circuit 311B, the discharge side of the scroll compression mechanism 16A of the expansion compressor 116 is connected to the inlet side of the heat transfer pipe of the fourth water heat exchanger 17 via the seventeenth connection refrigerant pipe 424A. The outlet side of the heat transfer tube of the fourth water heat exchanger 17 is connected to the inflow side of the scroll expansion mechanism 16B of the expansion compressor 116 via the eighteenth connection refrigerant pipe 424B, and the scroll expansion mechanism 16B of the expansion compressor 116 is connected. Is connected to the inlet side of the fourth air heat exchanger 20 via the nineteenth connecting refrigerant pipe 424C, and the outlet side of the fourth air heat exchanger 20 is connected to the expansion compressor via the twentieth connecting refrigerant pipe 424D. 116 is connected to the suction side of the scroll compression mechanism 16A.

  The second heat pump unit 310B is installed outdoors.

  Further, the electric motor of the expansion compressor 16 and the electric motor of the compressor 15 of the first heat pump unit 310A are communicatively connected to a control device (not shown) so that the rotational speed and the like are centrally controlled.

(3) Connection Mode between the First Heat Pump Unit 310A and the Second Heat Pump Unit 310B and the Hot Water Storage Tank Unit 30 The third water pipe 34 of the hot water storage tank unit 30 is connected to the first heat pump unit 310A via the fifth communication water pipe 351. The third water heat exchanger 17 and the first water pipe 25 extending from the inlet of the water jacket of the fourth water heat exchanger 17 of the second heat pump unit 310B are connected. Further, the fourth water pipe 33 of the hot water storage tank unit 30 is connected to the third water heat exchanger 17 of the first heat pump unit 310A and the fourth water exchanger 17 of the second heat pump unit 310B via the sixth connection water pipe 352. It is connected to a second water pipe 26 extending from the outlet of the water jacket. Here, the fifth connecting water pipe 351 and the sixth connecting water pipe 352 are branch pipes as shown in FIG.

[Operation of heat pump water heater]
In this heat pump hot water supply device 3, only the expansion compressor 116 is operated when low capacity such as nighttime hot water storage is sufficient, and compression is performed in addition to the expansion compressor 116 when large capacity is required, such as when hot water supply load is concentrated. The machine 15 is operated.

(1) Low-capacity operation In low-capacity operation, when the expansion compressor 116 starts operation, the gas refrigerant is drawn into the scroll compression mechanism 16A of the expansion compressor 116 and compressed, and then enters a supercritical state. Then, the refrigerant is sent to the heat transfer tube of the fourth water heat exchanger 17 through the seventeenth connecting refrigerant pipe 424A, and is cooled by exchanging heat with water or hot water flowing through the water jacket of the fourth water heat exchanger 17. That is, at this time, the water or hot water flowing through the heat transfer tube of the fourth water heat exchanger 17 is heated to become hot hot water (hot water). The hot hot water (hot water) is sent to the hot water storage tank 31 by the water pump 32. When the hot water (hot water) sent to the hot water storage tank 31 does not reach the set hot water temperature, the hot water (hot water) is further sent to the fourth water heat exchanger 17 by the water pump 32. Conversely, when the hot hot water (hot water) sent to the hot water storage tank 31 reaches the set hot water temperature, the expansion compressor 116 and the water pump 32 are stopped.

  The cooled supercritical refrigerant is sent to the scroll expansion mechanism 16B of the expansion compressor 116 through the eighteenth connection refrigerant pipe 424B, and after being depressurized, is supplied to the fourth air heat exchanger 20, The refrigerant is evaporated by exchanging heat with air blown from one fan 21 to become a gas refrigerant.

  The gas refrigerant that has flowed out of the fourth air heat exchanger 17 passes through the twentieth connection refrigerant pipe 424D and is again sucked into the scroll compression mechanism 16A of the expansion compressor 116. In this way, low-capacity operation is performed.

(2) Large capacity operation In the large capacity operation, when the compressor 15 and the expansion compressor 116 start operation, in the third refrigerant circuit 311A, after the gas refrigerant is sucked into the compressor 15 and compressed, It becomes a supercritical state, is sent to the heat transfer pipe of the third water heat exchanger 17 through the thirteenth connecting refrigerant pipe 324A, and is cooled by exchanging heat with water or hot water flowing through the water jacket of the third water heat exchanger 17 Is done. On the other hand, in the fourth refrigerant circuit 311B, after the gas refrigerant is sucked and compressed by the scroll compression mechanism 16A of the expansion compressor 116, the gas refrigerant enters a supercritical state and passes through the seventeenth connection refrigerant pipe 424A. It is sent to the heat transfer tube of the water heat exchanger 17 and cooled by exchanging heat with water or hot water flowing through the water jacket of the fourth water heat exchanger 17. That is, at this time, the water or hot water flowing through the heat transfer tubes of the third water heat exchanger 17 and the fourth water heat exchanger 17 is heated to become hot hot water (hot water). The hot hot water (hot water) is sent to the hot water storage tank 31 by the water pump 32. When the hot water (hot water) sent to the hot water storage tank 31 does not reach the set hot water temperature, the hot water (hot water) is further supplied by the water pump 32 to the third water heat exchanger 17 and the fourth water heat exchanger. 17 will be sent. Conversely, when the hot water (hot water) sent to the hot water storage tank 31 reaches the set hot water temperature, the compressor 15, the expansion compressor 116, and the water pump 32 are stopped.

  In the third refrigerant circuit 311A, the cooled supercritical refrigerant is sent to the electronic expansion valve 118 through the fourteenth connecting refrigerant pipe 324B, and after being decompressed, is supplied to the third air heat exchanger 20, It is evaporated by exchanging heat with the air blown from the third fan 21 to become a gas refrigerant. On the other hand, in the fourth refrigerant circuit 311B, the cooled supercritical refrigerant is sent to the scroll type expansion mechanism 16B of the expansion compressor 116 through the eighteenth connection refrigerant pipe 424B and decompressed, and then the fourth air heat The refrigerant is evaporated by exchanging heat with the air supplied to the exchanger 20 and blown from the fourth fan 21 to become a gas refrigerant.

  In the third refrigerant circuit 311A, the gas refrigerant flowing out from the third air heat exchanger 17 is again sucked into the compressor 115 through the sixteenth connection refrigerant pipe 324D. On the other hand, in the fourth refrigerant circuit 311B, the gas refrigerant flowing out from the fourth air heat exchanger 17 passes through the twentieth connection refrigerant pipe 424D and is again sucked into the scroll compression mechanism 16A of the expansion compressor 116. . In this way, large capacity driving is performed.

[Features of heat pump water heater]
In the heat pump hot water supply device 3 according to the present embodiment, the third refrigerant circuit 311A connects the compressor 15, the third water heat exchanger 17, the electronic expansion valve 118, and the third air heat exchanger 20 sequentially. The fourth refrigerant circuit 311B sequentially connects the scroll compression mechanism 16A of the expansion compressor 116, the fourth water heat exchanger 17, the scroll expansion mechanism 16B of the expansion compressor 116, and the fourth air heat exchanger 20. It has become. Further, in this heat pump hot water supply device 3, only the expansion compressor 116 is operated when low capacity such as nighttime hot water storage is sufficient, and in addition to the expansion compressor 116 when large capacity is required such as when hot water supply load is concentrated. Thus, the compressor 15 is operated. For this reason, in this heat pump hot-water supply apparatus 3, energy can be utilized effectively.

[Modification]
(A)
In the heat pump hot water supply apparatus 3 according to the previous embodiment, the expansion compressor 116 having the scroll type compression mechanism 16A is employed, but instead, other types of compression such as a rotary type and a swing type are used. An expansion compressor equipped with a mechanism may be adopted.

(B)
In the heat pump hot water supply device 3 according to the previous embodiment, the expansion compressor 116 on which the scroll type expansion mechanism 16B is mounted is adopted, but instead, other types of expansion such as a rotary type and a swing type are employed. An expansion compressor equipped with a mechanism may be adopted.

(C)
In the heat pump hot water supply apparatus 3 according to the previous embodiment, the electric motor of the expansion compressor 116 is inverter-controlled, but the electric motor of the expansion compressor 116 may be operated at a constant speed.

(D)
In the heat pump hot water supply device 3 according to the previous embodiment, the electric motor of the compressor 15 is inverter-controlled, but the electric motor of the compressor 15 may be operated at a constant speed.

(E)
In the heat pump hot water supply apparatus 3 according to the previous embodiment, the motors of the compressor 15 and the expansion compressor 116 are both inverter-controlled, but both the motors of the compressor 15 and the expansion compressor 116 are operated at a constant speed. It doesn't matter.

(F)
In the heat pump hot water supply apparatus 3 according to the previous embodiment, the scroll type compressor 15 is employed. However, instead of this, another type of compressor such as a rotary type or a swing type may be employed. .

(G)
In the heat pump hot water supply device 3 according to the previous embodiment, CO2 (carbon dioxide) is sealed as a refrigerant in the third refrigerant circuit 311A and the fourth refrigerant circuit 311B. It can be used as a refrigerant such as hydrogen. However, in this case, the third water heat exchanger 17 and the fourth water heat exchanger 17 function not as a gas cooler but as a condenser.

  The heat pump hot water supply apparatus according to the present invention has a feature that energy can be used effectively, and is useful for an air conditioner, a hot water supply apparatus, and the like that require high energy efficiency.

It is a simple lineblock diagram of the heat pump hot-water supply apparatus concerning a 1st embodiment. It is a simple block diagram of the heat pump hot-water supply apparatus which concerns on 2nd Embodiment. It is a simple block diagram of the heat pump hot-water supply apparatus which concerns on 3rd Embodiment.

1, 2, 3 Heat pump hot water supply device 11 Refrigerant circuit 13 Bypass piping (bypass flow path, refrigerant inflow control unit)
14 Injection piping (injection flow path, refrigerant inflow control part)
15,115 Compressor (compressor)
16, 116 expansion compressor (fluid conveying device, first fluid conveying device, third fluid conveying device)
16A scroll compression mechanism (compression unit, first compression unit, third compression unit)
16B Scroll type expansion mechanism (expansion part, first expansion part, third expansion part)
16C Rotating shaft (Rotating shaft)
17 Water heat exchanger (radiator, first radiator, second radiator, third radiator, fourth radiator)
18 1st refrigerant | coolant amount adjustment valve (1st flow volume adjustment mechanism, refrigerant | coolant inflow amount adjustment part)
19 Second refrigerant amount adjustment valve (second flow rate adjustment mechanism, refrigerant inflow amount adjustment unit)
20 Air heat exchanger (evaporator, first evaporator, second evaporator, third evaporator, fourth evaporator)
111A 1st refrigerant circuit (2nd refrigerant circuit)
111B Second refrigerant circuit (first refrigerant circuit)
118 Electronic expansion valve (expansion valve)
311A Third refrigerant circuit (fourth refrigerant circuit)
311B Fourth refrigerant circuit (third refrigerant circuit)

Claims (2)

A first fluid conveyance device (116) having a first compression section (16A) and a first expansion section (16B) connected to a rotation shaft (16C) of the first compression section;
A first refrigerant circuit (111B) formed by sequentially connecting the first compression section, the first radiator (17), the expansion valve (118), and the first evaporator (20);
A second refrigerant circuit (111A) formed by sequentially connecting a compression device (115), a second radiator (17), the first expansion section, and a second evaporator (20);
Bei to give a,
When the frequency of the first fluid conveying device (116) becomes lower than the compression device (115) when the frequency becomes lower than a predetermined outside air temperature, the compression device when the frequency becomes higher than the predetermined outside air temperature. Control to be higher than (115),
Heat pump water heater (2). The compression device (115) is rotationally driven at a constant speed,
The first compression unit (16A) and the first expansion unit (16B) are inverter controlled.
The heat pump hot-water supply apparatus of Claim 1.

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