JP2723380B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-room heat pump air conditioner in which a plurality of indoor units are connected to one heat source unit, and in particular, air conditioning and heating are selectively performed for each indoor unit. The present invention relates to an air conditioner capable of simultaneously performing cooling in one indoor unit and heating in the other indoor unit.

[0002]

2. Description of the Related Art A conventional example will be described below. FIG. 7 is an overall configuration diagram mainly showing a refrigerant system of a conventional air conditioner. FIGS. 8, 9 and 10 show the operation state during the cooling / heating operation in the conventional example of FIG. 7, FIG. 8 is an operation state diagram of only the cooling or heating operation, and FIGS. FIG. 9 shows the main operation of heating (when the total capacity of the indoor unit that is going to perform the heating operation is larger than the total capacity of the indoor unit that is going to perform the cooling operation), and FIG. (When the total capacity of the indoor units to be heated is larger than the total capacity of the indoor units to be heated). In this conventional example, a case where three indoor units are connected to one heat source unit will be described, but the same applies to a case where two or more indoor units are connected.

In FIG. 7, A is a heat source unit, and B, C, and D are indoor units connected in parallel to each other as described later, and have the same configuration. E is a repeater including a first branch, a second flow controller, a second branch, a gas-liquid separator, and first and second heat exchangers, as described later.
1 is a compressor, 2 is a four-way switching valve for switching the refrigerant flow direction of the heat source device, 3 is a heat source device side heat exchanger, 4 is an accumulator, and is connected to the above devices 1 to 3 to constitute a heat source device A. 5
Is the indoor heat exchanger of each of the indoor units B, C and D, 6 is a thick first connection pipe connecting the four-way switching valve 2 and the relay unit E,
6b, 6c, and 6d connect the indoor-side heat exchangers 5 of the indoor units B, C, and D to the relay unit E, respectively, and the first connection pipe on the indoor unit side corresponding to the first connection pipe 6; Second connection pipes 7b, 7c and 7d, which are thinner than the first connection pipe 6 connecting the heat source unit side heat exchanger 3 and the relay unit E, are connected to the indoor heat exchangers 5 of the indoor units B, C and D, respectively. And a relay unit E, and a second connection pipe on the indoor unit side corresponding to the second connection pipe 7,
Reference numeral 8 denotes a three-way switching valve that is switchably connected to the first connection pipes 6b, 6c, and 6d on the indoor unit side and to the first connection pipe 6 or the second connection pipe 7, and 9 is an indoor heat exchanger. 5 is a first flow control device connected to the outlet side of the indoor heat exchanger 5 and controlled by the degree of superheating during cooling and the degree of supercooling during heating, and a second connection pipe on the indoor unit side. 7b, 7c, 7d
Connected to.

[0004] Reference numeral 10 denotes first connection pipes 6b and 6 on the indoor unit side.
c, 6d and a first three-way switching valve 8 switchably connected to the first connection pipe 6 or the second connection pipe 7.
And 11 are second connection pipes 7b, 7c on the indoor unit side.
Reference numeral 7d denotes a second branch portion formed by the merging portion. Reference numeral 12 denotes a gas-liquid separation device provided in the middle of the second connection pipe 7, and the gas phase portion includes a first port of the three-way switching valve 8. 8a, the liquid phase portion of which is connected to the second branch portion 11. 13
Is an openable and closable second flow control device connected between the gas-liquid separator 12 and the second branch portion 11, and 14 is a bypass pipe connecting the second branch portion 11 and the first connection pipe 6. , 15 are a third flow control device provided in the middle of the bypass pipe 14, 16
b, 16c, 16d are third flow control devices for the bypass pipe 14.
A third heat exchange section is provided downstream of the second branch section 15 and exchanges heat with the second connection pipes 7b, 7c, 7d on the indoor unit side in the second branch section 11, respectively. Downstream of the third flow control device 15 and the third heat exchange section 16b,
A second heat exchange section provided downstream of 16c and 16d and exchanging heat with the junction of the second connection pipes 7b, 7c and 7d on the indoor unit side in the second branch section 11; Is the downstream of the third flow control device 15 of the bypass pipe 14 and the second heat exchange section.
A first heat exchange section which is provided downstream of 16a and exchanges heat between a pipe connecting the gas-liquid separation device 12 and the second flow rate control device 13 is provided. An openable and closable fourth flow control device 32 connected between the third connection pipe 6 and the third connection pipe 7 is provided between the heat source side heat exchanger 3 and the second connection pipe 7.
And allows the refrigerant to flow only from the heat source side heat exchanger 3 to the second connection pipe 7.

Reference numeral 33 denotes a fourth check valve provided between the four-way switching valve 2 of the heat source unit A and the first connection pipe 6, and the refrigerant is supplied only from the first connection pipe 6 to the four-way switching valve 2. Allow distribution. Reference numeral 34 denotes a fifth check valve provided between the four-way switching valve 2 of the heat source unit A and the second connection pipe 7, and allows the refrigerant to flow only from the four-way switching valve 2 to the second connection pipe 7. . Reference numeral 35 denotes a sixth check valve provided between the heat source side heat exchanger 3 and the first connection pipe 6, and allows the refrigerant to flow only from the first connection pipe 6 to the heat source side heat exchanger 3. I do. The third check valve 32 to the sixth check valve 35 constitute a flow path switching valve device 40. Reference numeral 41 denotes a liquid drain pipe having one end connected to the gas-liquid separator 12 and the other end connected to the first connection pipe 6, and reference numeral 42 denotes a liquid drain pipe 41 provided between the gas-liquid separator 12 and the first connection pipe 6. Fifth flow control device, 43
Is a fourth heat exchange unit provided downstream of the fifth flow control device 42 in the liquid drain pipe 41 and performing heat exchange between the gas-liquid separator 12 and the pipe connecting the first branch unit 10. is there.

Reference numeral 23 denotes a first temperature detector attached to a pipe connecting the second flow control device 13 and the first heat exchange unit 19;
Is a first pipe attached to the same pipe as the first temperature detector 23.
, A reference numeral 26 denotes a second pressure detector attached to the second branch 11, and a reference numeral 52 denotes a third pressure detector attached to a pipe connecting the first connection pipe 6 and the first branch 10. And 51, a second temperature detector attached to the outlet of the fourth heat exchange unit 43 on the drain pipe 41 side, and 53 attached to the outlet side of the first heat exchange unit 19 on the bypass pipe 14 side. This is a third temperature detector.

The operation of the conventional example configured as described above will be described. First, the case of only the cooling operation will be described with reference to FIG. That is, as shown by the solid line arrow in FIG. 8, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2 and exchanges heat in the heat source device side heat exchanger 3 to be condensed. , The second connection pipe 7, the gas-liquid separator 12, the second flow control device 13, the second branch portion 11, and the second connection pipes 7b and 7c on the indoor unit side. , 7d
, The refrigerant flowing into each of the indoor units B, C, and D is decompressed to a low pressure by the first flow control device 9 controlled by the degree of superheat at the outlet of each of the indoor heat exchangers 5, and the indoor heat exchange is performed. The unit 5 exchanges heat with room air to evaporate and gasify, thereby cooling the room. The gaseous refrigerant is supplied to the first connection pipes 6b, 6c, 6d on the indoor unit side by the three-way switching valve 8,
, The first connection pipe 6 and the fourth check valve 3
3. A circulation cycle is drawn into the compressor 1 via the four-way switching valve 2 and the accumulator 4 to perform a cooling operation. At this time, the three-way switching valve 8 has its first port 8a closed.
The second port 8b and the third port 8c are open.

At this time, since the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure, the third check valve 32 and the fourth
Refrigerant flows to the check valve 33. Also, during this cycle,
Part of the refrigerant that has passed through the second flow control device 13 enters the bypass pipe 14, is reduced to a low pressure by the third flow control device 15, and is cooled by the third heat exchange units 16b, 16c, and 16d in each indoor unit. Between the second connection pipes 7b, 7c, 7d on the indoor unit side of the second branch section 11 in the second heat exchange section 16a between the second connection pipes 7b, 7c, 7d on the side of the indoor unit. And the refrigerant that has exchanged heat with the refrigerant flowing into the second flow control device 13 in the first heat exchange unit 19 and evaporates, enters the first connection pipe 6, and enters the fourth connection pipe 6. check valve 33, the four-way switching valve 2, an accumulator 4
, And is sucked into the compressor 1. On the other hand, the first, second, and third heat exchangers 19, 16a, 16b, 16c, 16d exchange heat, and the refrigerant in the second branch 11, which has been cooled and provided with a sufficient degree of subcooling, will be cooled. Indoor units B, C, and D
Flows into

In the cooling operation, if the refrigerant sealed in the air conditioner is not filled so as to fill the second connection pipe with the high-pressure liquid refrigerant, the high-pressure refrigerant condensed in the heat source side heat exchanger 3 After passing through the second connection pipe 7 and the gas-liquid separation device 12, the phase refrigerant passes through the first, second, and third heat exchange sections.
19, 16a, 16b, 16c, 16d, third flow control device
The indoor unit B, which is liquefied and further cooled by performing heat exchange with the refrigerant flowing through the bypass side depressurized to a low pressure at 15 to achieve a sufficient degree of supercooling, to perform cooling.
Flow into C and D.

Next, a case of only the heating operation will be described with reference to FIG. That is, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2 as shown by a dashed arrow in FIG. 8, the fifth check valve 34, the second connection pipe 7, and the gas-liquid separation device. 12, through a first branch 10, a three-way switching valve 8,
The refrigerant flowing into the indoor units B, C, and D through the first connection pipes 6b, 6c, and 6d on the indoor unit side exchanges heat with the indoor air to be condensed and liquefied, thereby heating the indoor room. The refrigerant in the liquid state passes through the first flow control device 9 controlled by the degree of supercooling at the outlet of each indoor heat exchanger 5, and passes through the second connection pipes 7b and 7c on the indoor unit side. , 7d to the second branch
It flows into and merges into 11 and further passes through a fourth flow control device 17, where either one of the first flow control device 9 or the fourth flow control device 17 is depressurized to a low pressure two-phase state. .
The refrigerant depressurized to a low pressure is supplied to the first connection pipe 6
Then, the refrigerant which flows into the sixth check valve 35 and the heat source unit side heat exchanger 3 and exchanges heat to evaporate into a gaseous state is sucked into the compressor 1 through the four-way switching valve 2 and the accumulator 4. A circulation cycle is configured to perform heating operation. At this time, the three-way switching valve 8 has the second port 8b closed and the first port 8a and the third port 8c open. At this time, since the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure,
The refrigerant flows through the check valve 34 and the sixth check valve 35.

The case of mainly heating in simultaneous cooling and heating operation will be described with reference to FIG. Here, a case will be described in which two indoor units B and C are about to heat and one indoor unit D is about to cool. That is, as shown by a solid arrow in FIG. 9, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, the fifth check valve 34, and the second connection pipe 7,
It is sent to the repeater E, passes through the gas-liquid separator 12, and
, A three-way switching valve 8 connected to the indoor units B and C,
The refrigerant flowing into the indoor units B and C to be heated in the order of the first connection pipes 6b and 6c on the indoor unit side exchanges heat with the indoor air in the indoor heat exchanger 5 to be condensed and liquefied. To heat. The refrigerant in the liquid state is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5, is slightly reduced in pressure through the first flow control device 9 which is almost fully opened, and is intermediate between high pressure and low pressure. It becomes pressure (intermediate pressure) and flows into the second branch portion 11 from the second connection pipes 7b and 7c on the indoor unit side. Then, the air enters the indoor unit D to be cooled through the second connection pipe 7d on the indoor unit side, and the pressure is reduced by the first flow control device 9 controlled by the degree of superheat at the outlet of the indoor heat exchanger 5. Later, the gas enters the indoor heat exchanger 5 and exchanges heat to evaporate to be in a gaseous state, cool the room, and flow into the first connection pipe 6 via the three-way switching valve 8 connected to the indoor unit D.

On the other hand, the other refrigerant passes through the second branch portion 11,
An indoor unit D to be cooled through an openable / closable fourth flow control device 17 controlled to keep the difference between the high pressure of the second connection pipe 7 and the intermediate pressure of the second branch portion 11 constant. The refrigerant flows into the thick first connection pipe 6 and flows into the sixth check valve 35 and the heat exchanger 3 on the side of the heat source device, exchange heat and evaporate into a gaseous state. The refrigerant forms a circulation cycle that is drawn into the compressor 1 through the four-way switching valve 2 and the accumulator 4, and performs a heating-main operation. At this time, the pressure difference between the evaporating pressure of the indoor heat exchanger 5 of the indoor unit D to be cooled and the evaporating pressure of the heat source side heat exchanger 3 is reduced due to switching to the thick first connection pipe 6. At this time, the three-way switching valve 8 connected to the indoor units B and C
The port 8b is closed, and the first port 8a and the third port 8c are open. In the three-way switching valve 8 connected to the indoor unit D, the second port 8b and the third port 8c are open, and the first port 8a is closed.

At this time, since the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure, the fifth check valve 34 and the sixth
The refrigerant circulates to the check valve 35. At the time of this cycle, a part of the liquid refrigerant is supplied to the second connection pipe 7b,
7c and 7d enter the bypass pipe 14 from the junction, and are decompressed to a low pressure by the third flow control device 15, and
a, the second connection pipe 7 on each indoor unit side of the second branch portion 11
b, 7c, 7d, the first heat exchange section
At 19, the refrigerant that has exchanged heat with the refrigerant flowing into the second flow control device 13 evaporates, enters the first connection pipe 6, passes through the sixth check valve 35, and passes through the heat source device side heat source. It flows into the exchanger 3 and exchanges heat to evaporate to a gaseous state. Then, the refrigerant is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4. On the other hand, the first, second, and third heat exchange units 19, 16
The refrigerant in the second branch portion 11, which has been cooled by the heat exchange in a, 16b, 16c, and 16d and has a sufficient degree of supercooling, flows into the indoor unit D to be cooled.

Referring to FIG. 10, a description will be given of a case where cooling is mainly performed in simultaneous cooling and heating operation. Here, indoor units B and C
A case will be described in which two units are going to be cooled and one indoor unit D is going to heat. That is, as shown by the solid arrows in FIG. 10, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2 and exchanges an arbitrary amount of heat in the heat source-side heat exchanger 3 to perform two-phase high-temperature and high-pressure. Gas, the third check valve 32, the second
Is sent to the gas-liquid separation device 12 of the repeater E from the connection pipe 7 of FIG. Here, the gaseous refrigerant and the liquid refrigerant are separated, and the separated gaseous refrigerant is going to be heated in the order of the first branch portion 10, the three-way switching valve 8, and the first connection pipe 6d on the indoor unit side. It flows into the indoor unit D, exchanges heat with the indoor air in the indoor heat exchanger 5 to condense and liquefy, and heats the room. Further, the pressure is slightly reduced through the first flow control device 9 which is controlled by the degree of supercooling at the outlet of the indoor-side heat exchanger 5 and is almost fully opened, and becomes an intermediate pressure between the high pressure and the low pressure (intermediate force). Branch of
Flow into 11. On the other hand, the remaining liquid refrigerant is controlled so that the difference between the high pressure and the intermediate pressure is constant.
It flows into the second branch portion 11 through, and merges with the refrigerant passing through the indoor unit D which are trying to heating.

Then, the second branch portion 11, the second unit on the indoor unit side,
Flows into the indoor units B and C through the connection pipes 7b and 7c. Then, the refrigerant is reduced to a low pressure by the first flow control device 9 controlled by the degree of superheat at the outlet of the indoor heat exchanger 5 of the indoor units B and C, and the refrigerant and indoor air are exchanged by the indoor heat exchanger 5. It is evaporated and gasified by heat exchange to cool the room. The gaseous refrigerant is supplied to the first connection pipes 6b and 6c on the indoor unit side, the three-way switching valve 8 connected to the indoor units B and C, the first branch portion 10, the first connection pipe. 6. A circulation cycle is drawn into the compressor 1 through the fourth check valve 33, the four-way switching valve 2, and the accumulator 4, and the cooling-main operation is performed. At this time, the three-way switching valve 8 connected to the indoor units B and C has the first port 8a closed, the second port 8b and the third port 8b.
The mouth 8c is open. In the three-way switching valve 8 connected to the indoor unit D, the first port 8a and the third port 8c are open, and the second port 8b is closed.

At this time, the first connection pipe 6 is set to a low pressure,
Since the connection pipe 7 has a high pressure, the refrigerant necessarily flows to the third check valve 32 and the fourth check valve 33. At the time of this cycle, a part of the liquid refrigerant is supplied to the second connection pipe 7b,
7c and 7d enter the bypass pipe 14 from the junction, and are decompressed to a low pressure by the third flow control device 15, and
a, the second connection pipe 7 on each indoor unit side of the second branch portion 11
b, 7c, 7d, the first heat exchange section
In 19, the refrigerant that exchanges heat with the refrigerant flowing into the second flow control device and evaporates enters the first connection pipe 6, and
Is sucked into the compressor 1 through the check valve 33, the four-way switching valve 2 and the accumulator 4. On the other hand, the refrigerant in the second branch portion 11, which has been cooled by being exchanged heat in the first, second and third heat exchange portions 19, 16a, 16b, 16c and 16d and having a sufficient degree of supercooling, is trying to cool. Flows into the indoor units B and C that are located.

The liquid surface, which is the boundary between the gaseous refrigerant and the liquid refrigerant separated by the gas-liquid separation device 12, is
When the liquid refrigerant is below the liquid drain pipe 41, the gaseous refrigerant flows into the liquid drain pipe 41 and the pressure is reduced to a low pressure by the fifth flow control device. Since the inlet of the fifth flow control device 42 is in a gas state, the amount of refrigerant flowing through the fifth flow control device 42 is small. For this reason, the refrigerant flowing through the liquid drain pipe 41 is supplied to the fourth heat exchange section.
At 43, heat exchange with the high-pressure gaseous refrigerant flowing into the first branch portion 10 from the gas-liquid separation device 12 to become a low-pressure superheated gas,
It flows into the first connection pipe 6. Conversely, if the liquid surface that is the boundary between the gaseous refrigerant and the liquid refrigerant separated by the gas-liquid separator 12 is above the liquid discharge pipe 41 of the gas-liquid separator 12, the liquid refrigerant is drained. After flowing into the pipe 41, the pressure is reduced to a low pressure by the fifth flow control device 42. Since the inlet of the fifth flow control device 42 is in a liquid state, the amount of the refrigerant flowing through the fifth flow control device 42 is larger than that in the case where the inlet is in a gaseous state. For this reason, the refrigerant flowing through the liquid drain pipe 41 is supplied to the fourth heat exchange section.
At 43, even if heat exchange is performed with the high-pressure gaseous refrigerant flowing from the gas-liquid separation device 12 into the first branch portion 10, it does not become a low-pressure superheated gas, but in a two-phase state, to the first connection pipe 6. Inflow.

[0018]

Since the conventional air conditioner as described above does not have a function of ventilation among the components of the air conditioning, an additional ventilation device is required.
There was a problem that the load generated by introducing the outdoor air could not be handled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and selectively performs cooling and heating for each indoor unit, and simultaneously performs cooling for one indoor unit and heating for the other indoor unit. It is an object of the present invention to provide an air conditioner that can be performed, has a ventilation function, and can respond to the operation state of an indoor unit that operates a load generated by ventilation.

[0020]

In an air conditioner capable of simultaneous cooling and heating operation according to the present invention, a single heat source unit including a compressor, a switching valve, a heat source side heat exchanger, and the like, and a chamber are provided. A plurality of indoor units having an internal heat exchanger are connected via first and second connection pipes, and one of the indoor heat exchangers of the plurality of indoor units is connected to the first indoor heat exchanger. A first branch portion switchably connected to a connection pipe or a second connection pipe, and the other of the indoor heat exchangers of the plurality of indoor units via the first flow control device to the second branch section; A second branch portion connected to the second connection pipe; and a second branch portion provided on the second connection pipe, the first branch portion and the second
A second flow control device that communicates with the branch portion of
The plurality of indoor units are circulated by a first indoor unit having a room-side heat exchanger that exchanges heat between the outside air introduced by the outside air introduction blower and the refrigerant supplied by the compressor, and a circulation blower. And a second indoor unit having an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant supplied by the compressor . At least one of the second indoor units performs a heating operation. case, the first indoor unit have line heating operation, it is also the second indoor unit is one for performing the heating operation
And a second indoor unit for performing at least one cooling operation
If there is, the first indoor unit performs cooling operation and heating operation
There is no second indoor unit that performs the rolling or cooling operation, and
If there is at least one second indoor unit that performs ventilation operation,
The indoor unit 1 is configured to perform a blowing operation .

[0021]

When at least one of the second indoor units is in the heating operation, the first indoor unit is heated to perform the heating operation, so that the air heated by the indoor heat exchanger of the first indoor unit is discharged. It is supplied to the second indoor unit. If there is no second indoor unit that performs the heating operation and there is a second indoor unit that performs the cooling operation even in one of the second indoor units, the first indoor unit performs the cooling operation. By doing so, the air cooled in the indoor heat exchanger of the first indoor unit is supplied to the indoor heat exchanger of the second indoor unit. In addition, among the second indoor units, if there is no second indoor unit that performs the heating operation or the cooling operation, and if there is a second indoor unit that performs the air blowing operation, the first indoor unit The indoor unit is operated to blow air.

[0022]

[Embodiment 1] Hereinafter, embodiments of the present invention will be described. FIG. 1 is an overall configuration diagram mainly showing a refrigerant system of an air conditioner according to an embodiment of the present invention. FIGS. 2, 3, and 4 show operating states of the air-conditioning apparatus shown in FIG. 1 during a cooling / heating operation. FIG. 2 is an operating state diagram of only cooling or heating, and FIGS. FIG. 3 shows an operation of simultaneous cooling and heating operation. FIG. 3 shows a heating main operation (when the total capacity of an indoor unit performing a heating operation is larger than a total capacity of an indoor unit performing a cooling operation), and FIG. 4 shows a cooling main operation (a cooling operation). FIG. 10 is an operation state diagram illustrating a case where the total capacity of the indoor units to be operated is larger than the total capacity of the indoor units to be heated. FIG. 5 is an overall configuration diagram mainly showing a refrigerant system of an air conditioner according to another embodiment of the present invention.
In this embodiment, a case where one heat source unit is connected to one first indoor unit and two second indoor units will be described. However, the first indoor unit and the second indoor unit are The same applies when one or more devices are connected.

In FIG. 1, A is a heat source unit, B is a first indoor unit, C and D are second indoor units, and a first indoor unit B and a second indoor unit.
Indoor units C and D are connected in parallel to each other as described later, and have the same configuration on the refrigeration cycle.
E is a repeater including a first branch, a second flow controller, a second branch, a gas-liquid separator, and first and second heat exchangers, as described later. 1 is a compressor, 2 is a switching valve for switching the refrigerant flow direction of the heat source unit, 3 is a heat source side heat exchanger, 4 is an accumulator, and is connected to the above devices 1 to 3 to constitute a heat source unit A. 5 is an indoor heat exchanger of the first and second indoor units B, C and D, 6 is a thick first connection pipe connecting the switching valve 2 and the relay unit E, 6b, 6c and 6d.
Connects the indoor-side heat exchangers 5 of the first and second indoor units B, C, and D to the repeater E, respectively, and connects the first connection pipes 7 and 7 on the indoor unit side corresponding to the first connection pipes 6. Is a second connection pipe thinner than the first connection pipe 6 for connecting the heat source unit side heat exchanger 3 and the relay unit E, and 7b, 7c, 7d are first and second indoor units B, C, D, respectively. Indoor heat exchanger 5 and repeater E
And the second unit on the indoor unit side corresponding to the second connection pipe 7.
8 are the first connection pipes 6b and 6 on the indoor unit side.
c, 6d and a three-way switching valve 9 switchably connected to the first connection pipe 6 or the second connection pipe 7 side, and a three-way switching valve 9 connected close to the indoor heat exchanger 5 and connected to the indoor heat exchanger 5 The first flow control device is controlled by the degree of superheating at the time of cooling on the outlet side of the air conditioner and by the degree of supercooling at the time of heating, and the second connection pipe 7 on the indoor unit side is used.
b, 7c, 7d.

Reference numeral 10 denotes the first connection pipes 6b and 6 on the indoor unit side.
c, 6d and a first three-way switching valve 8 switchably connected to the first connection pipe 6 or the second connection pipe 7.
And 11 are second connection pipes 7b, 7c on the indoor unit side.
Reference numeral 7d and a second branch portion including the associated portion, 12 is a gas-liquid separation device provided in the middle of the second connection pipe 7, and the gas phase portion is provided at each first port of the three-way switching valve 8. 8a, the liquid phase portion of which is connected to the second branch portion 11. 13
Is an openable and closable second flow control device connected between the gas-liquid separator 12 and the second branch portion 11, and 14 is a bypass pipe connecting the second branch portion 11 and the first connection pipe 6. , 15 are a third flow control device provided in the middle of the bypass pipe 14, 16
b, 16c, 16d are third flow control devices for the bypass pipe 14.
A third heat exchange section is provided downstream of the second branch section 15 and exchanges heat with the second connection pipes 7b, 7c, 7d on the indoor unit side in the second branch section 11, respectively. Downstream of the third flow control device 15 and the third heat exchange section 16b,
A second heat exchange section provided downstream of 16c and 16d and exchanging heat with the junction of the second connection pipes 7b, 7c and 7d on the indoor unit side in the second branch section 11; Is the downstream of the third flow control device 15 of the bypass pipe 14 and the second heat exchange section.
A first heat exchange section which is provided downstream of 16a and exchanges heat between a pipe connecting the gas-liquid separation device 12 and the second flow rate control device 13 is provided. An openable and closable fourth flow control device 32 connected between the third connection pipe 6 and the third connection pipe 7 is provided between the heat source side heat exchanger 3 and the second connection pipe 7.
And allows the refrigerant to flow only from the heat source side heat exchanger 3 to the second connection pipe 7.

Reference numeral 33 denotes a fourth check valve provided between the switching valve 2 of the heat source unit A and the first connection pipe 6, and allows the refrigerant to flow only from the first connection pipe 6 to the switching valve 2. Allow. Reference numeral 34 denotes a fifth check valve provided between the switching valve 2 of the heat source unit A and the second connection pipe 7, and a fifth check valve 34 from the switching valve 2 to the second connection pipe 7.
Only the refrigerant flow is allowed. Reference numeral 35 denotes a sixth check valve provided between the heat source side heat exchanger 3 and the first connection pipe 6, and allows the refrigerant to flow only from the first connection pipe 6 to the heat source side heat exchanger 3. I do. The third check valve 32 to the sixth check valve
The flow path switching valve device 40 is constituted by 35. Reference numeral 41 denotes a liquid drain pipe having one end connected to the gas-liquid separator 12 and the other end connected to the first connection pipe 6, and reference numeral 42 denotes a liquid drain pipe 41 provided between the gas-liquid separator 12 and the first connection pipe 6. Fifth flow control device, 43 is a drain pipe
A fourth heat exchange unit provided downstream of the fifth flow control device 42 of 41 and exchanging heat between the gas-liquid separation device 12 and a pipe connecting the first branch unit 10.

Reference numeral 23 denotes a first temperature detector attached to a pipe connecting the second flow control device 13 and the first heat exchange unit 19;
Is a first pressure detector attached to the same pipe as the first temperature detector, 26 is a third pressure detector attached to the second branch 11, and 52 is the first connection pipe 6 and the first A third pressure detector 51 attached to a pipe connecting the branch portion 10 of the second, and a second pressure detector 51 attached to the outlet side of a fourth heat exchange section 43 on the liquid drain pipe 41 side.
Temperature detector 53, the first heat exchange section on the bypass pipe 14 side
19 is a third temperature detector attached to the 19 outlet side.

Further, the first indoor unit B sucks outdoor air 60 and passes it through the indoor heat exchanger 5 of the first indoor unit B for the purpose of, for example, ventilation, and further converts the air to the second indoor unit B. It is configured to supply the primary air 61 and 62 of the indoor heat exchanger 5 of the indoor units C and D, respectively .

The operation of the present invention thus configured will be described. First, the case of only the cooling operation will be described with reference to FIG. That is, as shown by a solid line arrow in FIG. 2, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the switching valve 2 and exchanges heat in the heat-source-unit-side exchanger 3 to be condensed. Stop valve 32, second connection pipe 7, gas-liquid separator
12, the second flow control device 13, the second branch portion 11, and the second connection pipes 7b, 7c, 7d on the indoor unit side, and the first and second indoor units B, C, respectively. , D is reduced to a low pressure by the first flow control device 9 controlled by the degree of superheat at the outlet of each indoor heat exchanger 5, and exchanges heat with air in the indoor heat exchanger 5. It evaporates and is gasified to cool the room. The refrigerant in the gaseous state passes through the first connection pipes 6b, 6c, 6d , the three-way switching valve 8, and the first branch portion 10 on the indoor unit side, and passes through the first connection pipe 6, the fourth connection pipe. Compressor 1 via check valve 33, switching valve 2, accumulator 4
A cooling cycle is performed by configuring a circulation cycle that is sucked into the air.
At this time, the first port 8a of the three-way switching valve 8 is closed, and the second port 8b and the third port 8c are open.

At this time, since the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure, the third check valve 32 and the fourth
Is circulated to the check valve 33. At the time of this cycle, a part of the refrigerant that has passed through the second flow control device 13 enters the bypass pipe 14, and is reduced to a low pressure by the third flow control device 15, and the third heat exchange unit 16b, The second heat exchange section 16a is provided between the second connection pipes 7b, 7c and 7d on the indoor unit side at 16c and 16d, and the second branch section 11 on the indoor unit side at the second heat exchange section 16a.
The heat exchange between the refrigerant and the refrigerant flowing into the second flow control device 13 in the first heat exchange unit 19 between the connection pipes 7b, 7c and 7d of The refrigerant enters the first connection pipe 6 and is sucked into the compressor 1 through the fourth check valve 33, the switching valve 2, and the accumulator 4. On the other hand, the first, second, and third heat exchangers 19, 16a, 16b, 16c, 16d exchange heat, and the refrigerant in the second branch 11, which has been cooled and provided with a sufficient degree of subcooling, will be cooled. Flows into the first and second indoor units B, C, D. When the refrigerant sealed in the air conditioner in the cooling operation is not filled so as to fill the second connection pipe with the high-pressure liquid refrigerant, the high-pressure gas-liquid two-phase condensed in the heat source side heat exchanger 3 After passing through the second connection pipe 7 and the gas-liquid separator 12, the refrigerant
And in the third heat exchange sections 19, 16a, 16b, 16c, 16d,
By exchanging heat with the refrigerant flowing on the bypass side reduced to a low pressure in the third flow control device 15, the first and second cooling units are liquefied and further cooled to achieve a sufficient degree of supercooling and to perform cooling. It flows into the indoor units B, C and D.

Next, the case of only the heating operation will be described with reference to FIG. That is, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the switching valve 2 as shown by the dashed arrow in FIG. 2 and passes through the fifth check valve 34, the second connection pipe 7, the gas-liquid separator 12 Through the first branch portion 10, the three-way switching valve 8, and the first connection pipes 6b, 6c, 6d on the indoor unit side, the refrigerant flowing into the first and second indoor units B, C, D is Heat exchange with air to condense and liquefy and heat the room. The refrigerant in the liquid state passes through the first flow control device 9 controlled by the degree of supercooling at the outlet of each indoor heat exchanger 5, and passes through the second connection pipes 7b and 7c on the indoor unit side. , 7d flow into the second branch 11 and merge there, further pass through the fourth flow control device 17, where the low pressure is applied to either the first flow control device 9 or the fourth flow control device 17. The pressure is reduced to the two-phase state. The refrigerant decompressed to a low pressure passes through the first connection pipe, flows into the sixth check valve 35, the heat source unit side heat exchanger 3, and exchanges heat to evaporate to a gaseous refrigerant. A circulation cycle is drawn into the compressor 1 via the switching valve 2 and the accumulator 4, and a heating operation is performed. At this time, the three-way switching valve 8 has the second port 8b closed and the first port 8a and the third port 8c open. At this time, since the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure,
The refrigerant flows through the check valve 34 and the sixth check valve 35.

The case of mainly heating in simultaneous cooling and heating operation will be described with reference to FIG. Here, a case will be described in which the first and second indoor units B and C are heating and the second indoor unit D is cooling. That is, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the switching valve 2, the fifth check valve 34, and the second connection pipe 7, and is sent to the relay E as shown by the solid line arrow in FIG. Through the gas-liquid separator 12, and then connected to the first branch 10, the first and second indoor units B and C, the three-way switching valve 8, and the first connection pipes 6b and 6c on the indoor unit side. The refrigerant flowing into the first and second indoor units B and C to be heated exchanges heat with the air in the indoor heat exchanger 5 to condense and liquefy, thereby heating the room. The refrigerant in the liquid state is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5, is slightly reduced in pressure through the first flow control device 9 which is almost fully opened, and is intermediate between high pressure and low pressure. It becomes pressure (intermediate pressure) and flows into the second branch portion 11 from the second connection pipes 7b and 7c on the indoor unit side. Then, the air enters the second indoor unit D which is about to be cooled through the second connection pipe 7d on the indoor unit side, and is controlled by the first flow control device 9 controlled by the degree of superheat at the outlet of the indoor heat exchanger 5. After the pressure is reduced, it enters the indoor heat exchanger 5 and exchanges heat to evaporate to a gaseous state to cool the room and flow into the first connection pipe 6 via the three-way switching valve 8 connected to the indoor unit D. I do.

On the other hand, the other refrigerant passes through the second branch 11 and
The second air-conditioning apparatus, which is to be cooled, passes through an openable and closable fourth flow control device 17 which is controlled so as to keep the difference between the high pressure of the second connection pipe 7 and the intermediate pressure of the second branch portion 11 constant. The refrigerant merges with the refrigerant passing through the indoor unit D, flows into the thick first connection pipe 6, flows into the sixth check valve 35, the heat source unit side heat exchanger 3, and exchanges heat to evaporate to a gas state. . The refrigerant is supplied to the switching valve 2,
A circulation cycle is drawn into the compressor 1 via the accumulator 4, and a heating-main operation is performed. At this time, the pressure difference between the evaporation pressure of the indoor-side heat exchanger 5 of the second indoor unit D to be cooled and the evaporation pressure of the heat-source-side heat exchanger 3 becomes small because of the switching to the thick first connection pipe 6. Become. At this time, the three-way switching valve 8 connected to the indoor units B and C has the second port 8b closed and the first port 8a and the third port 8c open. Also, a three-way switching valve 8 connected to the indoor unit D
The second port 8b and the third port 8c are open, and the first port 8a is closed.

At this time, since the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure, the fifth check valve 34 and the sixth
The refrigerant circulates to the check valve 35. At the time of this cycle, a part of the liquid refrigerant is supplied to the second connection pipe 7b,
7c enters the bypass pipe 14 from the junction, is decompressed to a low pressure by the third flow control device 15, and the second connection pipe 7b on the indoor unit side of the second branch 11 in the second heat exchange section 16a. , 7c
The refrigerant that has exchanged heat with the refrigerant flowing into the second flow control device 13 in the first heat exchange unit 19 and evaporated in the first heat exchange unit 19 enters the first connection pipe 6, After passing through the check valve 35 of No. 6, the heat flows into the heat source device side heat exchanger 3 and exchanges heat to evaporate to a gas state. Then, the refrigerant is sucked into the compressor 1 via the switching valve 2 and the accumulator. On the other hand, the refrigerant in the second branch portion 11, which has been cooled by being exchanged heat in the first, second and third heat exchange portions 19, 16a, 16b, 16c and 16d and having a sufficient degree of supercooling, is trying to cool. Into the second indoor unit D.

Referring to FIG. 4, a description will be given of a case where cooling is mainly performed in simultaneous cooling and heating operation. Here, the first and second
The two indoor units B and C are heating, the second indoor unit D is trying to cool, and the cooling load of the second indoor unit D is the first and second indoor units B and C. A case where the load is larger than the heating load will be described. That is, as shown by a solid line arrow in FIG. 4, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the switching valve 2 and exchanges an arbitrary amount of heat in the heat exchanger 3 on the heat source unit side to perform a two-phase high-temperature It becomes high-pressure refrigerant and is sent from the third check valve 32 and the second connection pipe 7 to the gas-liquid separator 12 of the repeater E. Here, the gaseous refrigerant is separated into the gaseous refrigerant and the liquid refrigerant, and the separated gaseous refrigerant is heated in the order of the first branch portion 10, the three-way switching valve 8, and the first connection pipes 6b and 6c on the indoor unit side. Flow into the first and second indoor units B and C,
The indoor heat exchanger 5 exchanges heat with air to condense and liquefy and heat the room. Further, the pressure is slightly reduced through the first flow control device 9 which is controlled by the degree of supercooling at the outlet of the indoor side heat exchanger 5 and is almost fully open, and becomes an intermediate pressure between the high pressure and the low pressure (intermediate pressure). Flows into the branching part 11. On the other hand, the remaining liquid refrigerant flows into the second branch portion 11 through the second flow control device 13 controlled so as to keep the difference between the high pressure and the intermediate pressure constant, and the first and second liquid refrigerants are heated. 2 indoor unit B,
Merges with the refrigerant passing through C.

Then, the second branch portion 11, the second unit on the indoor unit side,
And flows into the second indoor unit D through the connection pipe 7d. Then, the refrigerant is reduced in pressure to a low pressure by the first flow control device 9 controlled by the degree of superheat at the outlet of the indoor heat exchanger 5 of the indoor unit D, and exchanges heat with indoor air in the indoor heat exchanger 5. It evaporates and is gasified to cool the room. The gaseous refrigerant is supplied to the first connection pipe 6 on the indoor unit side.
d, the compressor 1 via the three-way switching valve 8 connected to the second indoor unit D, the first branch portion 10, the first connection pipe 6, the fourth check valve 33, the switching valve 2, and the accumulator 4 A circulation cycle is drawn in, and cooling-main operation is performed. At this time, the three-way switching valve 8 connected to the second indoor unit D has the first port 8a closed and the second port 8b and the third port 8c open. The three-way switching valve 8 connected to the first and second indoor units B and C has the first port 8a and the third port 8c open,
The mouth 8b is closed.

At this time, the first connection pipe 6 is set to a low pressure,
Since the connection pipe 7 has a high pressure, the refrigerant necessarily flows to the third check valve 32 and the fourth check valve 33. At the time of this cycle, a part of the liquid refrigerant is supplied to the second connection pipe 7b,
7c enters the bypass pipe 14 from the junction, is decompressed to a low pressure by the third flow control device 15, and the second connection pipe 7b on the indoor unit side of the second branch 11 in the second heat exchange section 16a. , 7c
And the refrigerant that has exchanged heat with the refrigerant flowing into the second flow control device in the first heat exchange unit 19 and evaporates, enters the first connection pipe 6, and The refrigerant is sucked into the compressor 1 through the check valve 33, the switching valve 2, and the accumulator 4. On the other hand, the first, second, and third heat exchange units 19, 16a,
The refrigerant in the second branch portion 11, which has been cooled by heat exchange at 16b, 16c and 16d and has a sufficient degree of supercooling, flows into the second indoor unit D to be cooled.

The liquid surface which is the boundary between the gaseous refrigerant and the liquid refrigerant separated by the gas-liquid separator 12 is
When the liquid refrigerant is below the liquid drain pipe 41, the gaseous refrigerant flows into the liquid drain pipe 41 and the pressure is reduced to a low pressure by the fifth flow control device. Since the inlet of the fifth flow control device 42 is in a gas state, the amount of refrigerant flowing through the fifth flow control device 42 is small. For this reason, the refrigerant flowing through the liquid drain pipe 41 is supplied to the fourth heat exchange section.
At 43, heat exchange with the high-pressure gaseous refrigerant flowing into the first branch portion 10 from the gas-liquid separation device 12 to become a low-pressure superheated gas,
It flows into the first connection pipe 6. Conversely, if the liquid surface that is the boundary between the gaseous refrigerant and the liquid refrigerant separated by the gas-liquid separator 12 is above the liquid discharge pipe 41 of the gas-liquid separator 12, the liquid refrigerant is drained. After flowing into the pipe 41, the pressure is reduced to a low pressure by the fifth flow control device 42. Since the inlet of the fifth flow control device 42 is in a liquid state, the amount of the refrigerant flowing through the fifth flow control device 42 is larger than that in the case where the inlet is in a gaseous state. For this reason, the refrigerant flowing through the liquid drain pipe 41 is supplied to the fourth heat exchange section.
At 43, even if heat exchange is performed with the high-pressure gaseous refrigerant flowing into the first branch portion 10 from the gas-liquid separation device 12, the first connection pipe 6 does not become a low-pressure superheated gas in a gas-liquid two-phase state. Flows into.

The operation of the first indoor unit B will be described with reference to FIG. In step 90, it is determined whether any of the second indoor units C and D is performing the heating operation. If the second indoor unit is performing the heating operation, the process proceeds to step 93, and the first indoor unit B performs the heating operation. If neither of the second indoor units C and D is performing the heating operation, the process proceeds to step 91. Step 91
Then, it is determined whether any of the second indoor units C and D is performing the cooling operation. If the cooling operation is being performed, the process proceeds to step 94, and the first indoor unit B performs the cooling operation. If neither of the second indoor units C and D is performing the cooling operation, the process proceeds to step 92. In step 92 the second indoor unit C, among and D, to determine whether any are blown operation, if the air blowing operation saw 95 binary steps, the first indoor unit B performs a blowing operation. If neither of the second indoor units C and D is performing the blowing operation, the process proceeds to step 96, and the first indoor unit B stops.

As described above, the first indoor unit B operates or stops in conjunction with the operation or stop of the second indoor units C and D. Furthermore, if at least one of the second indoor units C and D is performing the heating operation, the first indoor unit B performs the heating operation, and the first indoor unit B is operated.
The cold outdoor air 60 sucked into the second indoor unit B is heated to, for example, room temperature by the indoor heat exchanger 5 of the first indoor unit B,
Are supplied as primary side air 61, 62 to the indoor units C, D, respectively. In this case, since the cold outdoor air 60 is warmed to, for example, room temperature by the first indoor unit B,
An increase in the heating load of the second indoor units C and D due to the introduction of outdoor air is suppressed. Here, for example, even when the second indoor unit C is for heating and the second indoor unit D is for cooling ,
That the indoor unit C of No. 2 is performing the heating operation means that the outdoor unit C
If the air is cold enough to create a heating load ,
The indoor unit D of No. 2 is performing the cooling operation with respect to the indoor cooling load.
Therefore, even if the outdoor air is warmed to room temperature, for example,
Even if it does not reduce the cooling load of the second indoor unit D that is performing the cooling operation , it does not increase it.

Further, when neither of the second indoor units C and D is performing the heating operation and any of the second indoor units C and D is performing the cooling operation, the first indoor unit B performs the cooling operation and the first indoor unit B performs the cooling operation. The outdoor air 60 sucked into the unit B is cooled by the inside heat exchanger 5 of the first indoor unit B, and is cooled by the second indoor units C and D, respectively.
The air is supplied as secondary air 61 and 62 . In this case, since the outdoor air 60 is cooled by the first indoor unit B, an increase in the cooling load of the second indoor units C and D due to the introduction of the outdoor air is suppressed. Further, when neither of the second indoor units C and D is in the heating operation or the cooling operation, and either of the second indoor units is in the air blowing operation, the first indoor unit B performs the air blowing operation to introduce the outdoor air 60. Ventilation is provided.

Embodiment 2 FIG. In the above embodiment, the three-way switching valve 8 is provided so that the first connection pipes 6b, 6c, 6d on the indoor unit side and the first connection pipe 6
Alternatively, it is connected to the second connection pipe 7 so as to be switchable. However, as shown in FIG. 5, two switch valves such as electromagnetic switch valves 30 and 31 may be provided so as to be switchably connected as described above. It has a similar effect.

[0042]

As described above, the air conditioner of the present invention comprises a single heat source unit including a compressor, a switching valve, a heat source side heat exchanger, and a plurality of indoor heat exchangers each having an indoor side heat exchanger. In one in which the indoor unit is connected via first and second connection pipes, one of the indoor heat exchangers of the plurality of indoor units is connected to the first connection pipe or the second connection pipe. A switchable first branch unit and the other of the indoor heat exchangers of the plurality of indoor units are connected to the second connection pipe via the first flow control device. A plurality of indoor units, comprising: a second branch portion; and a second flow control device provided in the second connection pipe and communicating the first branch portion and the second branch portion. Sucks outdoor air, passes through the indoor heat exchanger, and outputs the indoor heat exchanger of another indoor unit. Since the first indoor unit that supplies air as the primary side air and the second indoor unit that receives supply of air from the first indoor unit to the primary side of the indoor heat exchanger is configured, outside air is supplied. Introducing and ventilating is possible, and cooling and heating can be selectively performed, and cooling can be performed in one indoor unit and heating can be performed in the other indoor unit at the same time.

When at least one second indoor unit is performing a heating operation, even if there is an indoor unit that is simultaneously cooling,
Since the first indoor unit is configured to perform the heating operation, the room
Outside air can respond appropriately, heated by the first indoor unit to approximately room temperature a second sent to the indoor unit Runode, an increase in the heating load or the cooling load of the second indoor unit is suppressed, uniform Heating or cooling to increase comfort. Further, when none of the second indoor units is performing the heating operation and one of the second indoor units is performing the cooling operation, the first indoor unit performs the cooling operation, and the outdoor air is cooled by the first indoor unit. Therefore, an increase in the cooling load of the second indoor unit that cools by introducing outdoor air is suppressed, and uniform cooling is obtained, and comfort is increased. Further, if none of the second indoor units is in the heating operation or the cooling operation and any of the second indoor units is in the ventilation operation, the first
The indoor unit performs ventilation operation and introduces outdoor air to perform ventilation.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram centering on a refrigerant system of an air-conditioning apparatus according to Embodiment 1 of the present invention.

FIG. 2 is an operation state diagram of only the cooling or heating of the air conditioner shown in FIG.

FIG. 3 is a diagram showing an operation state of the air-conditioning apparatus shown in FIG. 1 mainly for heating.

FIG. 4 is an operation state diagram of the air conditioning apparatus shown in FIG. 1 mainly for cooling.

FIG. 5 is an overall configuration diagram centering on a refrigerant system of an air conditioner according to another embodiment of the present invention.

FIG. 6 is a flowchart showing an operation for explaining the operation of the first indoor unit in the present invention.

FIG. 7 is an overall configuration diagram mainly showing a refrigerant system of a conventional air conditioner.

8 is an operation state diagram of only cooling or heating of the air-conditioning apparatus shown in FIG.

9 is an operation state diagram of the air-conditioning apparatus shown in FIG. 7 mainly for heating.

FIG. 10 is an operation state diagram of the air conditioning apparatus shown in FIG. 7 mainly for cooling and heating.

[Explanation of symbols]

A heat source unit, B first indoor unit, C and D second indoor unit, E repeater, 1 compressor, 2 switching valve, 3 heat source side heat exchanger, 4 accumulator, 5 indoor side heat exchanger,
6 first connection pipe, 7 second connection pipe, 9 first flow control device, 10 first branch portion, 11 second branch portion, 12 gas-liquid separation device, 13 second flow control device,
14 bypass piping, 15 third flow control device, 16
a second heat exchange section, 16b, 16c, 16d third heat exchange section, 17 fourth flow control device , 60 outdoor air
(Primary air of the first indoor unit B), 61 second indoor
Primary air of unit C, 62 Primary air of second indoor unit D
Qi .

Continued on the front page. (72) Inventor Tomohiko Kasai 6-5-6, Tehira, Wakayama City Mitsubishi Electric Corporation Wakayama Works (72) Inventor Shigeo Takada 6-566 Teira, Wakayama City Mitsubishi Electric Wakayama Corporation In the factory (72) Inventor Junichi Kameyama 6-66, Tehira, Wakayama-shi Mitsubishi Electric Corporation Wakayama Works (56) References JP-A-1-98841 (JP, A) JP-A-3-125868 (JP) , A)

Claims (1)

(57) [Claims] 1. A first and a second connection between one heat source unit including a compressor, a switching valve, a heat source unit side heat exchanger and the like and a plurality of indoor units each having an indoor side heat exchanger. in those connected through a pipe, the plurality of indoor units of the indoor side heat exchanger while the first connecting pipe or gas-liquid separation instrumentation
A first branch portion that is switchably connected to a second connection pipe via a second unit, and the other one of the indoor heat exchangers of the plurality of indoor units is connected to the second branch via a first flow control device. A second branch portion connected to the connection pipe, and a second flow control device provided in the second connection pipe and communicating the gas-liquid separation device and the second branch portion, The plurality of indoor units introduces outdoor air, exchanges heat with the indoor heat exchanger, and supplies the heat-exchanged air to another indoor unit; And a second indoor unit that receives supply of heat-exchanged air from the indoor unit, and when at least one of the second indoor units performs a heating operation, the first indoor unit is A second indoor unit that performs a heating operation and has no second indoor unit that performs the heating operation and performs at least one cooling operation If there is the indoor unit, the first indoor unit performs cooling operation, the air is blown operation in the second indoor unit is no single, and one to perform the heating operation or the cooling operation 2
An air conditioner capable of simultaneous cooling and heating operation, wherein the first indoor unit performs a blowing operation when there is an indoor unit of (1).