JPH04366374A - Air conditioning apparatus - Google Patents

Abstract

PURPOSE:To make it possible to cool and heat each chamber selectively by installing first indoor equipment which sucks up outdoor air and circulates the air in an indoor side heat exchanger and a second indoor equipment which receives the air which has passed through the first indoor equipment as a primary air for a second indoor side heat exchanger. CONSTITUTION:First indoor equipment B and second indoor equipment C and D are connected with each other in parallel. They are connected with heat source equipment A by way of relay equipment E which is built-in with second branch sections 10 and 11, flow rate control devices 9 and 13 and a gas-liquid separation device 12. In the air conditioning apparatus, there is provided a fan so as to take in the outside air. The outside air thus introduced is led to the first indoor equipment B where heat exchange takes place with an indoor side heat exchanger 5. There is also provided a fan which circulates the indoor air. The air circulated by this fan is introduced to the second indoor equipment C and D so that they perform heat exchange with the indoor side heat exchanger 5. At least one equipment out of the second indoor equipments which operates in heating (cooling) mode, the first indoor equipment is adapted to operate in heating mode (cooling mode) as well.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a multi-room heat pump type air conditioner in which a plurality of indoor units are connected to one heat source unit. The present invention also relates to an air conditioner that can simultaneously perform cooling with one indoor unit and heating with the other indoor unit.

0002

2. Description of the Related Art A conventional example will be explained below. FIG. 7 is an overall configuration diagram centered on the refrigerant system of a conventional air conditioner. 8, 9, and 10 show operating states during cooling/heating operation in the conventional example shown in FIG. Figure 9 shows the operation mainly for heating (when the total capacity of the indoor units trying to operate heating is larger than the total capacity of the indoor units trying to operate cooling), and Figure 10 shows the operation mainly for cooling (when the indoor units trying to operate cooling). FIG. 12 is an operation state diagram showing a case in which the total capacity of the indoor units that are currently being operated is larger than the total capacity of the indoor units that are attempting to perform heating operation. Although this conventional example describes a case where three indoor units are connected to one heat source device, the same applies to a case where two or more indoor units are connected.

[0003] In FIG. 7, A is a heat source unit, and B, C, and D are indoor units connected in parallel to each other, each having the same configuration as described later. As will be described later, E is a repeater incorporating a first branch, a second flow rate adjustment device, a second branch, a gas-liquid separation device, and first and second heat exchangers. 1 is a compressor, 2 is a four-way switching valve that switches the refrigerant flow direction of the heat source machine, 3 is a heat exchanger on the heat source machine side, and 4 is an accumulator, which are connected to the above-mentioned devices 1 to 3 to constitute heat source machine A. 5
are the indoor heat exchangers of the indoor units B, C, and D, respectively; 6 is the thick first connection pipe that connects the four-way switching valve 2 and the repeater E;
6b, 6c, and 6d connect the indoor heat exchangers 5 of the indoor units B, C, and D, respectively, and the repeater E, and 7 is the first connection pipe on the indoor unit side corresponding to the first connection pipe 6; Second connection pipes 7b, 7c, and 7d connecting the heat source machine side heat exchanger 3 and the repeater E are thinner than the first connection pipe 6, and 7b, 7c, and 7d are the indoor heat exchangers 5 of the indoor units B, C, and D, respectively. and a second connection pipe on the indoor unit side that connects the repeater E and corresponds to the second connection pipe 7;
8 is a three-way switching valve that is switchably connected to the first connection pipes 6b, 6c, 6d on the indoor unit side and the first connection pipe 6 or the second connection pipe 7 side; 9 is an indoor heat exchanger 5 and is controlled by the degree of superheating during cooling and the degree of subcooling during heating on the outlet side of the indoor heat exchanger 5, and is connected to the second connecting pipe on the indoor unit side. 7b, 7c, 7d
connected to.

10 is the first connection pipe 6b, 6 on the indoor unit side.
c, 6d, and a three-way switching valve 8 that is switchably connected to the first connecting pipe 6 or the second connecting pipe 7.
11 is the second connection pipe 7b, 7c on the indoor unit side.
, 7d and a second branching section consisting of a confluence section thereof; 12 is a gas-liquid separation device provided in the middle of the second connecting pipe 7; It is connected to the port 8a, and its liquid phase part is connected to the second branch part 11. 13 is a second flow rate regulating device that can be opened and closed and is connected between the gas-liquid separation device 12 and the second branch 11; 14 is a second flow rate regulating device;
A bypass pipe 15 connects the branch part 11 and the first connection pipe 6, and 15 is a third pipe provided in the middle of the bypass pipe 14.
The flow rate adjustment devices 16b, 16c, and 16d are provided downstream of the third flow rate adjustment device 15 in the bypass pipe 14, and are connected to the second connection pipe 7 on each indoor unit side in the second branch portion 11.
b, 7c, and 7d, respectively;
A second heat exchange section 19 is provided downstream of d and performs heat exchange with the merging section of the second connection pipes 7b, 7c, and 7d on each indoor unit side in the second branch section 11, and 19 is a bypass. Piping 1
Heat exchange is performed between pipes that are provided downstream of the third flow rate adjustment device 15 of No. 4 and downstream of the second heat exchange section 16a and connect the gas-liquid separation device 12 and the second flow rate control device 13. A first heat exchange part, 17 is a fourth flow rate control device that can be opened and closed, and is connected between the second branch part 11 and the first connection pipe 6;
32 is a third check valve 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. do.

33 is a fourth check valve provided between the four-way switching valve 2 of the heat source device A and the first connecting pipe 6;
The refrigerant is allowed to flow only from the connecting pipe 6 to the four-way switching valve 2. 34 is the four-way switching valve 2 of the heat source device A and the second connection pipe 7
This is a fifth check valve provided between the four-way switching valve 2 and the second connecting pipe 7, which allows refrigerant to flow only from the four-way switching valve 2 to the second connecting pipe 7. 35 is a sixth check valve provided between the heat source side heat exchanger 3 and the first connection pipe 6, and allows refrigerant flow only from the first connection pipe 6 to the heat source side heat exchanger 3. do. The third check valve 32 to the sixth check valve 35 constitute a switching valve 40. 4
1 has one end connected to the gas-liquid separator 12 and the other end connected to the first connecting pipe 6
42 is a fifth flow control device provided between the gas-liquid separation device 12 and the first connection pipe 6 of the liquid drain pipe 41; 43 is a fifth flow rate control device of the liquid drain pipe 41; This is a fourth heat exchange section that is provided downstream of the device 42 and performs heat exchange between the gas-liquid separation device 12 and the piping that connects the first branch section 10 . 23 is a first temperature detector attached to a pipe connecting the second flow rate control device 13 and the first heat exchange section 19; 25 is a first temperature detector attached to the same pipe as the first temperature detector 23; Pressure detectors; 26 is a second pressure detector attached to the second branch 11; 52 is a third pressure detector attached to the pipe connecting the first connection pipe 6 and the first branch 10; , 51 is the fourth heat exchange section 4 on the liquid draining pipe 41 side.
A second temperature sensor 53 is attached to the outlet of the first heat exchanger 19 on the bypass piping 14 side.

The operation of the conventional example configured as described above will be explained. First, the case of only cooling operation will be described using FIG. 8. That is, as shown by the solid arrow in FIG. 8, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, exchanges heat with the heat exchanger 3 on the heat source side, and is condensed. The check valve 32 of
The refrigerant that has flowed into each of the indoor units B, C, and D through channels c and 7d is reduced to a low pressure by the first flow rate regulating device 9, which is controlled by the degree of superheating at the outlet of each indoor heat exchanger 5, and then returned to the indoor unit. It exchanges heat with indoor air in the inner heat exchanger 5, evaporates and becomes gas, and cools the room. The refrigerant in this gas state is
The first connecting pipes 6b, 6c, 6d on the indoor unit side pass through the three-way switching valve 8 and the first branch part 10, and the first connecting pipes 6, 4th
This constitutes a circulation cycle in which air is sucked into the compressor 1 through the check valve 33, the four-way switching valve 2, and the accumulator 4, and performs cooling operation. At this time, the three-way switching valve 8 has each first port 8
a is closed, and second port 8b and third port 8c are open.

At this time, since the first connecting pipe 6 is under low pressure and the second connecting pipe 7 is under high pressure, the refrigerant inevitably flows to the third check valve 32 and the fourth check valve 33. Also, during this cycle, a part of the refrigerant that has passed through the second flow rate adjustment device 13 enters the bypass pipe 14, is reduced in pressure to a low pressure by the third flow rate adjustment device 15, and is transferred to the third heat exchange section 16b, 16c, 16
d between the second connection pipes 7b, 7c, 7d on each indoor unit side, and the second connection pipes 7b, 7c on each indoor unit side of the second branch part 11 at the second heat exchange part 16a. , 7d, and the second flow rate control device 1 at the first heat exchange section 19.
The evaporated refrigerant exchanges heat with the refrigerant flowing into 3, enters the first connecting pipe 6, passes through the fourth check valve 33, the four-way switching valve 2, and the accumulator 4, and is sucked into the compressor 1. be done. On the other hand, the first, second and third heat exchange parts 19, 16
The refrigerant in the second branch section 11, which has been cooled and sufficiently subcooled through heat exchange in a, 16b, 16c, and 16d, flows into the indoor units B, C, and D to be cooled. In addition, when the refrigerant sealed in the air conditioner during cooling operation is not sealed enough to fill the second connection pipe with high-pressure liquid refrigerant, the high-pressure two-phase refrigerant condensed in the heat source side heat exchanger 3 , the second connection pipe 7, and the gas-liquid separator 12, and then the first, second, and third heat exchange parts 19, 16a.
, 16b, 16c, 16d, the third flow rate control device 1
By exchanging heat with the refrigerant flowing through the bypass side, which was reduced to a low pressure in step 5, the indoor units B and C are liquefied and further cooled to a sufficient degree of supercooling, and are about to be cooled.
, D.

Next, the case of only heating operation will be explained using FIG. That is, as shown by the broken 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, the fifth check valve 34, the second connection pipe 7,
The refrigerant that has passed through the gas-liquid separator 12, passed through the first branch part 10, the three-way switching valve 8, and the first connection pipes 6b, 6c, and 6d on the indoor unit side, and has flowed into each indoor unit B, C, and D. , exchanges heat with indoor air, condenses and liquefies, heating the room. The refrigerant in a liquid state then passes through a first flow rate adjustment device 9 that is controlled by the degree of subcooling at the outlet of each indoor heat exchanger 5.
It flows from the second connection pipes 7b, 7c, and 7d on the indoor unit side to the second branch part 11, merges, and further passes through the fourth flow rate adjustment device 17, where it flows into the first flow rate adjustment device 9 or the fourth flow rate adjustment device 17. The pressure is reduced to a low pressure two-phase state by either one of the flow regulating devices 17 of No. 4. Then, the refrigerant reduced to a low pressure is transferred to the first connection pipe 6
The refrigerant, which flows into the sixth check valve 35 and the heat source machine side heat exchanger 3, undergoes heat exchange and evaporates into a gas state, is sucked into the compressor 1 via 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 its second port 8b closed, and its first port 8a and third port 8c opened. At this time, since the first connecting pipe 6 is under low pressure and the second connecting pipe 7 is under high pressure, the refrigerant inevitably flows to the fifth check valve 34 and the sixth check valve 35.

[0009] A case in which heating is the main component in simultaneous cooling and heating operation will be explained with reference to FIG. Here, a case will be described in which two indoor units B and C are trying to heat the room, and one indoor unit D is trying to cool the room. That is, as shown by the solid line arrow in FIG. 9, the high-temperature, 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, and is sent to the relay machine E. It passes through the gas-liquid separator 12, and then passes through the first branch 10, the three-way switching valve 8 connected to the indoor units B and C, and the first connection pipes 6b and 6c on the indoor unit side, and is heated. The refrigerant that has flowed into the indoor units B and C exchanges heat with indoor air in the indoor heat exchanger 5, condenses and liquefies, and heats the room. The refrigerant in this liquid state is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5,
It passes through the first flow regulating device 9 which is in an almost fully open state, and is slightly reduced in pressure to a pressure between high pressure and low pressure (intermediate pressure), and then flows from the second connecting pipes 7b, 7c on the indoor unit side to the second branch part 11. flows into. Then, it passes through the second connection pipe 7d on the indoor unit side and enters the indoor unit D that is being cooled, and is depressurized by the first flow rate adjustment device 9 controlled by the degree of superheating at the outlet of the indoor heat exchanger 5. After that, it enters the indoor heat exchanger 5, exchanges heat, evaporates, becomes a gas, cools the room, and then goes to the indoor unit D.
The water flows into the first connecting pipe 6 through a three-way switching valve 8 connected to the first connecting pipe 6.

On the other hand, other refrigerants pass through the second branch section 11, which is controlled to keep the difference between the high pressure of the second connecting pipe 7 and the intermediate pressure of the second branch section 11 constant. It passes through the fifth flow rate adjustment device 17, joins with the refrigerant that has passed through the indoor unit D to be cooled, flows into the thick first connection pipe 6, and passes through the sixth check valve 35, the heat reducing machine side heat It flows into the exchanger 3, exchanges heat, and evaporates into a gas state. The refrigerant forms a circulation cycle in which the refrigerant is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4, and performs heating-dominant operation. At this time,
The pressure difference between the evaporation pressure of the indoor heat exchanger 5 and the evaporation pressure of the heat source side heat exchanger 3 of the indoor unit D to be cooled becomes smaller because the first connection pipe 6 is switched to the thicker one. At this time, the second ports 8b of the three-way switching valves 8 connected to the indoor units B and C are closed, and the first ports 8a and third ports 8c are opened. In addition, 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 connecting pipe 6 is under low pressure and the second connecting pipe 7 is under high pressure, the refrigerant inevitably flows to the fifth check valve 34 and the sixth check valve 35. Also, during this cycle, some of the liquid refrigerant is transferred to the second connection pipe 7b on the side of each indoor unit.
, 7c, and 7d enter the bypass pipe 14 from the confluence part of the pipes, and the pressure is reduced to low pressure by the third flow rate regulating device 15, and the second heat exchanger part 16a passes through the second branch part 11 on each indoor unit side. The refrigerant that has been evaporated through heat exchange with the refrigerant flowing into the second flow rate control device 13 in the first heat exchange section 19 is further transferred to the confluence section of the connecting pipes 7b, 7c, and 7d. The liquid enters the connecting pipe 6, passes through the sixth check valve 35, flows into the heat exchanger 3 on the heat source side, exchanges heat, and evaporates to become a gas. This refrigerant is then sucked into the compressor 1 through the four-way switching valve 2 and the accumulator 4. On the other hand, the refrigerant in the second branch part 11, which has been cooled by heat exchange in the first, second, and third heat exchange parts 19, 16a, 16b, 16c, and 16d and has been sufficiently subcooled, tries to cool down. It flows into the indoor unit D.

[0012] A case in which cooling is the main component in simultaneous heating and cooling operation will be explained with reference to FIG. Here, indoor unit B,
A case will be explained in which two indoor units C are trying to cool the room and one indoor unit D is trying to heat the room. That is, as shown by the solid line arrow in FIG. 10, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, exchanges an arbitrary amount of heat with the heat exchanger 3 on the heat source equipment side, and becomes a two-phase high-temperature, high-pressure refrigerant gas. becomes a gas, and the third check valve 32
, from the second connection pipe 7 to the gas-liquid separator 12 of the repeater E.
sent to. Here, the gaseous refrigerant is separated into a gaseous refrigerant and a liquid refrigerant, and the separated gaseous refrigerant is passed through the first branch part 10, the three-way switching valve 8, and the first connecting pipe 6d on the indoor unit side in this order for heating. Flows into the indoor unit D and passes through the indoor heat exchanger 5
It exchanges heat with indoor air, condenses and liquefies, heating the room. Furthermore, it is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5 and is slightly reduced through the first flow rate regulator 9 which is in an almost fully open state, resulting in a pressure between high pressure and low pressure (intermediate force). It flows into the branch part 11 of. On the other hand, the remaining liquid refrigerant flows into the second branch part 11 through the second flow rate adjustment device 13 that is controlled to keep the difference between the high pressure and the intermediate pressure constant, and then flows into the second branch part 11 to heat the indoor unit D. It merges with the refrigerant that passed through it.

[0013]Then, the water passes through the second branch 11 and the second connection pipes 7b, 7c on the indoor unit side, and flows into each of the indoor units B, C. Then, this refrigerant is reduced in pressure to a low pressure by the first flow rate regulating device 9, which is controlled by the degree of superheating at the outlet of the indoor heat exchanger 5 of the indoor units B and C, and is mixed with indoor air in the indoor heat exchanger 5. It exchanges heat and evaporates into gas, cooling the room. Then, this refrigerant in a gas state is transferred to the first refrigerant on the indoor unit side.
connecting pipes 6b, 6c, three-way switching valve 8 connected to indoor units B, C, first branch 10, first connecting pipe 6, fourth
A circulation cycle is configured in which air is sucked into the compressor 1 through the check valve 33, the four-way switching valve 2, and the accumulator 4, and air-conditioning-based operation is performed. At this time, the first ports 8a of the three-way switching valves 8 connected to the indoor units B and C are closed, and the second ports 8b and third ports 8c are opened. Moreover, the three-way switching valve 8 connected to the indoor unit D has the first port 8a and the third port 8c open;
The second port 8b is closed.

At this time, the first connection pipe 6 is at low pressure, and the second
Because the connecting pipe 7 is under high pressure, the third check valve 32,
The refrigerant flows to the fourth check valve 33. Also, during this cycle, some of the liquid refrigerant is transferred to the second connection pipe 7 on each indoor unit side.
It enters the bypass pipe 14 from the junction of b, 7c, and 7d,
The pressure is reduced to low pressure by the third flow rate adjustment device 15, and the second heat exchange part 16a is connected to the confluence part of the second connection pipes 7b, 7c, and 7d on each indoor unit side of the second branch part 11. , and further the first
The evaporated refrigerant undergoes heat exchange with the refrigerant flowing into the second flow rate control device in the heat exchange section 19 of the first connection pipe 6.
The air enters the compressor 1 through the fourth check valve 33, the four-way switching valve 2, and the accumulator 4. On the other hand, the first, second and third heat exchange parts 19, 16a, 16b, 16c,
The refrigerant in the second branch part 11, which has been cooled by heat exchange in step 16d and has been sufficiently subcooled, flows into the indoor units B and C which are to be cooled.

Furthermore, if the liquid level, which is the interface between the gaseous refrigerant and the liquid refrigerant separated in the gas-liquid separator 12, is below the liquid drain pipe 41 of the gas-liquid separator 12, the gaseous refrigerant flows into the liquid drain pipe 41 and is reduced in pressure to a low pressure by the fifth flow rate control device 42. Since the inlet of the fifth flow rate control device 42 is in a gas state, the amount of refrigerant flowing through the fifth flow rate control device 42 is small. Therefore, the refrigerant flowing through the liquid draining pipe 41 is transferred from the gas-liquid separator 12 to the first
The refrigerant exchanges heat with the high-pressure gaseous refrigerant flowing into the branch section 10, becomes a low-pressure superheated gas, and flows into the first connecting pipe 6. Conversely, if the liquid level, which is the interface between the gaseous refrigerant and the liquid refrigerant separated in the gas-liquid separator 12, is above the liquid drain pipe 41 of the gas-liquid separator 12, the liquid refrigerant is drained. It flows into the pipe 41 and is reduced in pressure to a low pressure by the fifth flow rate control device 42. Since the inlet of the fifth flow rate control device 42 is in a liquid state, more refrigerant flows through the fifth flow rate control device 42 than when the inlet is in a gaseous state. Therefore, even if the refrigerant flowing through the liquid draining pipe 41 exchanges heat with the high-pressure gaseous refrigerant flowing from the gas-liquid separator 12 into the first branch part 10 in the fourth heat exchange part 43, the refrigerant flows at a low pressure. It does not become superheated gas, but flows into the first connection pipe 6 in a two-phase state.

[0016]

[Problems to be Solved by the Invention] Conventional air conditioners such as those described above do not have the function of ventilation among the air conditioning elements, so an additional ventilation device is required.
There was a problem in that it could not cope with the load generated by introducing the outdoor air.

[0017] This invention was made to solve the above-mentioned problems, and it is possible to selectively perform heating and cooling for each indoor unit, and simultaneously perform cooling in one indoor unit and heating in the other indoor unit. To provide an air conditioner which can provide a ventilation function and which can respond to the load generated by ventilation according to the operating state of an operating indoor unit.

[0018]

[Means for Solving the Problems] In the air conditioner capable of simultaneous cooling and heating operation according to the present invention, a single heat source machine including a compressor, a four-way switching valve, a heat exchanger on the heat source machine side, an accumulator, etc. , an indoor heat exchanger, a first flow rate control device, etc., are connected via first and second connection pipes, and the indoor heat of the plurality of indoor units is Connect one side of the exchanger to the first connection pipe or the second connection pipe.
A first branch section having a switching valve that is switchably connected to the connecting pipe of the indoor unit, and the other of the indoor heat exchangers of the plurality of indoor units are connected to the second branch section through the first flow rate control device.
A first branch part connected to a connecting pipe of the first part is connected via a second flow rate control device to a second branch part formed by connecting to a connecting pipe of The indoor unit comprises an indoor unit and a second indoor unit that includes a blower that circulates indoor air and exchanges heat with the air that is circulated by the blower, and at least one of the second indoor units When performing heating operation, the first indoor unit is configured to perform heating operation.

[0019] Furthermore, if there is no second indoor unit that performs heating operation among the second indoor units, and at least one second indoor unit performs cooling operation, the first indoor unit Set the machine to cooling operation.

[0020] Furthermore, when there is no second indoor unit that performs heating operation or cooling operation among the second indoor units, and there is at least one second indoor unit that performs ventilation operation, The first indoor unit is operated to blow air.

[0021]

[Operation] When even one second indoor unit is in heating operation, by heating the first indoor unit, the air warmed by the indoor heat exchanger of the first indoor unit is It is supplied to the second indoor unit. In addition, if there is no second indoor unit that performs heating operation among the second indoor units, and there is at least one second indoor unit that performs cooling operation, the first indoor unit is set to cooling operation. By doing so, the air cooled by the indoor heat exchanger of the first indoor unit is supplied to the indoor heat exchanger of the second indoor unit. In addition, if there is no second indoor unit that performs heating operation or cooling operation among the second indoor units, and there is at least one second indoor unit that performs ventilation operation, the first This is to operate the indoor unit to blow air.

[0022]

【Example】

Example 1. Examples of the present invention will be described below. FIG. 1 is an overall configuration diagram centered on the refrigerant system of an air conditioner according to an embodiment of the present invention. Furthermore, FIGS. 2, 3, and 4 show the operating states of the air conditioner shown in FIG. 1 during cooling/heating operation. FIG. Figure 3 shows the operation of simultaneous cooling and heating operation. Figure 3 shows the heating-dominant operation (when the total capacity of the indoor units attempting heating operation is larger than the total capacity of the indoor units attempting cooling operation), and Figure 4 shows the cooling-dominant operation (cooling operation). FIG. 7 is an operation state diagram showing a case where the total capacity of the indoor units that are about to be operated is larger than the total capacity of the indoor units that are about to be operated for heating. FIG. 5 is an overall configuration diagram centered on the refrigerant system of an air conditioner according to another embodiment of the present invention. In this example, a case will be described in which one first indoor unit and two second indoor units are connected to one heat source unit, but the first indoor unit and the second indoor unit are The same applies even when one or more units of each 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 the first indoor unit B, the second indoor unit
The indoor units C and D are connected in parallel to each other as will be described later, and have the same configuration on the refrigeration cycle. As will be described later, E is a repeater incorporating a first branch, a second flow rate adjustment device, a second branch, a gas-liquid separation device, and first and second heat exchangers. 1 is a compressor, 2 is a four-way switching valve that switches the refrigerant flow direction of the heat source machine, 3 is a heat exchanger on the heat source machine side, and 4 is an accumulator, which are connected to the above-mentioned devices 1 to 3 to constitute heat source machine A. 5 are the first and second respectively
indoor heat exchangers for indoor units B, C, and D; 6 is a thick first connection pipe that connects the four-way switching valve 2 and the repeater E; 6b, 6;
c and 6d connect the indoor heat exchangers 5 of the first and second indoor units B, C, and D, respectively, and the repeater E, and are the first connections on the indoor unit side corresponding to the first connection piping 6. Piping, 7 is the first connection piping 6 that connects the heat source machine side heat exchanger 3 and the relay machine E.
Thinner second connection pipes 7b, 7c, and 7d connect the indoor heat exchangers 5 and repeater E of the first and second indoor units B, C, and D, respectively, and are connected to the second connection pipes 7. The corresponding second connection pipe on the indoor unit side, 8 is the first connection pipe 6 on the indoor unit side
b, 6c, and 6d, a three-way switching valve that is switchably connected to the first connecting pipe 6 or the second connecting pipe 7, and 9 is connected close to the indoor heat exchanger 5 for indoor heat exchange. Vessel 5
The first flow rate adjusting device is controlled by the degree of superheating during cooling and the degree of subcooling during heating on the exit side of the air conditioner, and is connected to second connection pipes 7b, 7c, and 7d on the indoor unit side.

10 is the first connection pipe 6b, 6 on the indoor unit side.
c, 6d, and a three-way switching valve 8 that is switchably connected to the first connecting pipe 6 or the second connecting pipe 7.
11 is the second connection pipe 7b, 7c on the indoor unit side.
, 7d and a second branching part consisting of a meeting part thereof; 12 is a gas-liquid separator installed in the middle of the second connecting pipe 7; It is connected to the port 8a, and its liquid phase part is connected to the second branch part 11. 13 is a second flow rate regulating device that can be opened and closed and is connected between the gas-liquid separation device 12 and the second branch 11; 14 is a second flow rate regulating device;
A bypass pipe 15 connects the branch part 11 and the first connection pipe 6, and 15 is a third pipe provided in the middle of the bypass pipe 14.
The flow rate adjustment devices 16b, 16c, and 16d are provided downstream of the third flow rate adjustment device 15 in the bypass pipe 14, and are connected to the second connection pipe 7 on each indoor unit side in the second branch portion 11.
b, 7c, and 7d, respectively;
A second heat exchange section 19 is provided downstream of d and performs heat exchange with the meeting section of the second connection pipes 7b, 7c, and 7d on each indoor unit side in the second branch section 11, and 19 is a bypass. Piping 1
Heat exchange is performed between pipes that are provided downstream of the third flow rate adjustment device 15 and downstream of the second heat exchange section 16a in No. 4 and connect the gas-liquid separation device 12 and the second flow rate adjustment device 13. A first heat exchange part, 17 is a fourth flow rate control device that can be opened and closed, and is connected between the second branch part 11 and the first connection pipe 6;
32 is a third check valve 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. do.

33 is a fourth check valve provided between the four-way switching valve 2 of the heat source device A and the first connecting pipe 6;
The refrigerant is allowed to flow only from the connecting pipe 6 to the four-way switching valve 2. 34 is the four-way switching valve 2 of the heat source device A and the second connection pipe 7
It is a fifth check valve provided between the four-way switching valve 2 and the four-way switching valve 2.
The refrigerant is allowed to flow only from the to the second connecting pipe 7. 35
is a sixth check valve provided between the heat source side heat exchanger 3 and the first connection pipe 6, and allows refrigerant flow only from the first connection pipe 6 to the heat source side heat exchanger 3. . The third check valve 32 to the sixth check valve 35 constitute a switching valve 40. Reference numeral 41 indicates a liquid draining pipe which has one end connected to the gas-liquid separator 12 and the other end to the first connecting pipe 6, and 42 indicates a liquid draining pipe 41 provided between the gas-liquid separator 12 and the first connecting pipe 6. A fifth flow rate control device 43 is provided downstream of the fifth flow rate control device 42 in the liquid draining pipe 41 and performs heat exchange between the gas-liquid separation device 12 and the pipe connecting the first branch section 10. This is the fourth heat exchange section. 23 is a first temperature detector attached to the pipe connecting the second flow rate control device 13 and the first heat exchange section 19, and 25 is a first pressure sensor attached to the same pipe as the first temperature detector. Detector, 26 is a third pressure detector attached to the second branch part 11, 52 is a third pressure detector attached to the pipe connecting the first connection pipe 6 and the first branch part 10, 51 is the fourth heat exchange part 43 on the side of the liquid draining pipe 41
A second temperature detector 53 is attached to the outlet side of the first heat exchange section 19 on the bypass piping 14 side.

Further, the first indoor unit B takes in outdoor air, passes it through the indoor heat exchanger 5 of the first indoor unit B, and then transfers the air to the second indoor unit, for example, for the purpose of ventilation. It is configured to be supplied as primary air to the indoor heat exchangers 5 of the machines C and D.

The operation of the present invention configured as described above will be explained. First, the case of only cooling operation will be described using FIG. 2. That is, as shown by the solid arrow in FIG. 2, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, exchanges heat with the heat source equipment side exchanger 3, and is condensed. It passes through the check valve 32, the second connection pipe 7, the gas-liquid separation device 12, and the second flow rate control device 13 in this order, and then passes through the second branch 11 and the second connection pipes 7b and 7 on the indoor unit side.
The refrigerant that has flowed into each of the first and second indoor units B, C, and D through channels c and 7d is controlled by the first flow rate control device 9 that is controlled by the degree of superheating at the outlet of each indoor heat exchanger 5. The pressure is reduced to a low pressure, and the air is evaporated and gasified by exchanging heat with indoor air in the indoor heat exchanger 5 to cool the room. Then, the refrigerant in the gas state is transferred to the first connection pipes 6b, 6c on the indoor unit side,
6d constitutes a circulation cycle in which the fluid passes through the three-way switching valve 8, the first branch 10, the first connecting pipe 6, the fourth check valve 33, the four-way switching valve 2, and the accumulator 4, and is sucked into the compressor 1. and perform cooling operation. At this time, the first port 8a of the three-way switching valve 8 is closed, and the second port 8b and third port 8c are opened.

At this time, since the first connecting pipe 6 is under low pressure and the second connecting pipe 7 is under high pressure, the refrigerant inevitably flows to the third check valve 32 and the fourth check valve 33. Also, during this cycle, a part of the refrigerant that has passed through the second flow rate control device 13 enters the bypass pipe 14, is reduced in pressure to a low pressure by the third flow rate control device 15, and is transferred to the third heat exchange section 16b, 16c, 16
d between the second connection pipes 7b, 7c, 7d on each indoor unit side, and the second connection pipe 7b on each indoor unit side of the second branch part 11 at the second heat exchange part 16a, The refrigerant that is evaporated through heat exchange with the refrigerant flowing into the second flow rate control device 13 in the first heat exchanger 19 is transferred to the first connecting pipe 6. The air enters the compressor 1 through the fourth check valve 33, the four-way switching valve 2, and the accumulator 4. On the other hand, the first, second and third heat exchange parts 19,1
6a, 16b, 16c, and 16d, and the refrigerant in the second branch section 11, which has been cooled and has a sufficient degree of supercooling, is transferred to the first and second indoor units B, C, which are about to be cooled.
Flows into D. In addition, when the refrigerant sealed in the air conditioner during cooling operation is not sealed enough to fill the second connection pipe with high-pressure liquid refrigerant, the high-pressure gas-liquid two-phase condensed in the heat source side heat exchanger 3 The refrigerant is supplied to the second connection pipe 7,
After passing through the gas-liquid separator 12, at the first, second and third heat exchange parts 19, 16a, 16b, 16c, 16d,
By exchanging heat with the refrigerant flowing through the bypass side, which has been reduced in pressure to a low pressure by the third flow rate control device 15, it is liquefied and further cooled. It flows into indoor units B, C, and D.

Next, the case of only heating operation will be explained using FIG. That is, as shown by the broken line arrow in FIG. 2, 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, the second connection pipe 7,
It passes through the gas-liquid separator 12, passes through the first branch part 10, the three-way switching valve 8, and the first connection pipes 6b, 6c, and 6d on the indoor unit side, and passes through the first and second indoor units B, C, and D. The refrigerant that flows into the room exchanges heat with the indoor air, condenses and liquefies, heating the room. Then, this liquid refrigerant passes through the first flow rate control device 9 controlled by the degree of subcooling at the outlet of each indoor heat exchanger 5, and then passes through the second connection pipes 7b, 7c on the indoor unit side. ,7
d, flows into the second branch 11, merges, and further passes through the fourth flow rate control device 17, where it flows into the first flow rate control device 9.
Alternatively, the pressure is reduced to a low-pressure two-phase state by either the fourth flow rate regulator 17 or the fourth flow rate regulator 17. The refrigerant, which has been reduced in pressure to a low pressure, passes through the first connection pipe, flows into the sixth check valve 35, and the heat exchanger 3 on the heat source equipment side, where it exchanges heat and evaporates into a gas state. A circulation cycle is configured in which air is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4, and heating operation is performed. At this time, the three-way switching valve 8 has each second port 8b.
is a closed circuit, and the first port 8a and the third port 8c are open circuits. At this time, since the first connecting pipe 6 is under low pressure and the second connecting pipe 7 is under high pressure, the fifth check valve 34 and the sixth check valve 3 are inevitably connected.
The refrigerant flows to 5.

[0030] A case in which heating is the main component 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 used for heating, and the second indoor unit D is used for cooling. In other words, as shown by the solid line arrow in FIG. the gas-liquid separator 12 and the first branch 10, the first and second
The refrigerant passes in this order through the three-way switching valve 8 connected to the indoor units B and C, and the first connection pipes 6b and 6c on the indoor unit side, and flows into the first and second indoor units B and C that are being heated. teeth,
It is condensed and liquefied by exchanging heat with indoor air in the indoor heat exchanger 5,
Heat the room. The refrigerant in this liquid state is
It is controlled by the degree of subcooling at the outlet of the indoor heat exchanger 5, and the pressure is slightly reduced through the first flow rate control device 9 which is in an almost fully open state, to a pressure between high pressure and low pressure (intermediate pressure), and then the indoor unit side It flows into the second branch part 11 from the second connecting pipes 7b and 7c. Then, it passes through the second connection pipe 7d on the indoor unit side, enters the second indoor unit D that is being cooled, and enters the indoor heat exchanger 5.
A first flow control device 9 controlled by the degree of superheating at the outlet of
After being depressurized, it enters the indoor heat exchanger 5, exchanges heat, evaporates, becomes a gas, cools the room, and then flows into the first connection pipe 6 via the three-way switching valve 8 connected to the indoor unit D. Inflow.

On the other hand, other refrigerants pass through the second branch 11, which is controlled to keep the difference between the high pressure of the second connecting pipe 7 and the intermediate pressure of the second branch 11 constant. It passes through the fifth flow rate control device 17 and merges with the refrigerant that has passed through the second indoor unit D that is being cooled, and is connected to the thick first connection pipe 6.
The gas flows into the sixth check valve 35 and the heat exchanger 3 on the heat source side, exchanges heat, and evaporates to become a gas. The refrigerant forms a circulation cycle in which the refrigerant is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4, and performs heating-dominant operation. At this time, the pressure difference between the evaporation pressure of the indoor heat exchanger 5 and the evaporation pressure of the heat source side heat exchanger 3 of the second indoor unit D that is trying to cool the air is small because the switch is made 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, the first port 8a and the third port 8c.
is open. Further, 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 connecting pipe 6 is under low pressure and the second connecting pipe 7 is under high pressure, the refrigerant inevitably flows to the fifth check valve 34 and the sixth check valve 35. Also, during this cycle, some of the liquid refrigerant is transferred to the second connection pipe 7b on the side of each indoor unit.
, 7c enters the bypass pipe 14 from the confluence part, and is reduced to a low pressure by the third flow rate regulator 15, and then transferred to the second heat exchange section 1.
At 6a, a first heat exchange section 19 is connected between the second branch section 11 and the confluence section of the second connection pipes 7b and 7c on each indoor unit side.
The refrigerant that has undergone heat exchange with the refrigerant flowing into the second flow rate control device 13 and evaporated enters the first connection pipe 6 and flows into the sixth flow control device 13.
It flows into the heat source equipment side heat exchanger 3 through the check valve 35, exchanges heat, and evaporates into a gas state. This refrigerant is then sucked into the compressor 1 through the four-way switching valve 2 and the accumulator. On the other hand, the first, second and third heat exchange parts 19, 16a,
The refrigerant in the second branch section 11, which has been cooled by heat exchange in 16b, 16c, and 16d and has been sufficiently subcooled, flows into the second indoor unit D that is being cooled.

[0033] A case in which cooling is the main component in simultaneous heating and cooling operation will be explained with reference to FIG. Here, the first and second
Two indoor units B and C are trying to heat the room, and one second indoor unit D is trying to cool the room, and the cooling load of the second indoor unit D is the same as that of the first and second indoor units B and D. A case where the load is larger than the heating load will be explained. That is, as shown by the solid arrow in FIG. 4, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, exchanges an arbitrary amount of heat with the heat exchanger 3 on the heat source equipment side, and converts into two-phase gas-liquid. It becomes high temperature and high pressure refrigerant, and the third check valve 3
2. From the second connection pipe 7, the gas-liquid separation device 1 of the repeater E
Sent to 2. Here, the gaseous refrigerant is separated into a gaseous refrigerant and a liquid refrigerant, and the separated gaseous refrigerant is passed through the first branch part 10, the three-way switching valve 8, and the first connecting pipes 6b and 6c on the indoor unit side in this order to perform heating. The first and second indoor units B and C
The air flows into the room, exchanges heat with indoor air in the indoor heat exchanger 5, condenses and liquefies, and heats the room. Furthermore, the pressure is slightly reduced through the first flow rate control device 9 which is controlled by the degree of subcooling at the outlet of the indoor heat exchanger 5 and is in an almost fully open state, resulting in a pressure between the high pressure and the low pressure (intermediate pressure). It flows into the branch part 11 of. On the other hand, the remaining liquid refrigerant passes through the second flow control device 13 which is controlled to keep the difference between the high pressure and the intermediate pressure constant.
The refrigerant flows into the branch section 11 of the refrigerant and joins with the refrigerant that has passed through the first and second indoor units B and C that are being heated.

The water then flows into the second indoor unit D through the second branch 11 and the second connection pipe 7d on the indoor unit side. This refrigerant is then reduced in pressure to a low pressure by a first flow rate control device 9 that is controlled by the degree of superheating at the outlet of the indoor heat exchanger 5 of the indoor unit D, and is then heat exchanged with indoor air in the indoor heat exchanger 5. It evaporates and becomes gas, cooling the room. Then, the refrigerant in the gas state is transferred to the first connection pipe 6d on the indoor unit side, the three-way switching valve 8 connected to the second indoor unit D, and the first connection pipe 6d on the indoor unit side.
branch part 10, first connection pipe 6, fourth check valve 33,
A circulation cycle is configured in which the air is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4, and air-conditioning-based 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, the second port 8b, and the third port 8c.
is open. Further, in the three-way switching valve 8 connected to the first and second indoor units B and C, 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 at low pressure, and the second
Because the connecting pipe 7 is under high pressure, the third check valve 32,
The refrigerant flows to the fourth check valve 33. Also, during this cycle, some of the liquid refrigerant is transferred to the second connection pipe 7 on each indoor unit side.
b, 7c enters the bypass pipe 14 from the confluence part, is reduced to low pressure by the third flow rate control device 15, and is connected to the second connection on each indoor unit side of the second branch part 11 in the second heat exchange part 16a. Further, a first heat exchange section 1 is provided between the confluence section of the pipes 7b and 7c.
The evaporated refrigerant undergoes heat exchange with the refrigerant flowing into the second flow rate control device at 9, enters the first connection pipe 6, and flows into the fourth flow control device.
It 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 part 11, which has been cooled by heat exchange in the first, second, and third heat exchange parts 19, 16a, 16b, 16c, and 16d, and has been sufficiently supercooled, will be cooled. The second indoor unit D
flows into.

Furthermore, if the liquid level, which is the interface between the gaseous refrigerant and liquid refrigerant separated in the gas-liquid separator 12, is below the liquid drain pipe 41 of the gas-liquid separator 12, the gaseous refrigerant flows into the liquid drain pipe 41 and is reduced in pressure to a low pressure by the fifth flow rate control device 42. Since the inlet of the fifth flow rate control device 42 is in a gas state, the amount of refrigerant flowing through the fifth flow rate control device 42 is small. Therefore, the refrigerant flowing through the liquid draining pipe 41 is transferred from the gas-liquid separator 12 to the first
The refrigerant exchanges heat with the high-pressure gaseous refrigerant flowing into the branch section 10, becomes a low-pressure superheated gas, and flows into the first connecting pipe 6. Conversely, if the liquid level, which is the interface between the gaseous refrigerant and the liquid refrigerant separated in the gas-liquid separator 12, is above the liquid drain pipe 41 of the gas-liquid separator 12, the liquid refrigerant is drained. It flows into the pipe 41 and is reduced in pressure to a low pressure by the fifth flow rate control device 42. Since the inlet of the fifth flow rate control device 42 is in a liquid state, more refrigerant flows through the fifth flow rate control device 42 than when the inlet is in a gaseous state. Therefore, even if the refrigerant flowing through the liquid draining pipe 41 exchanges heat with the high-pressure gaseous refrigerant flowing from the gas-liquid separator 12 into the first branch part 10 in the fourth heat exchange part 43, the refrigerant flows at a low pressure. The gas does not become a superheated gas and flows into the first connection pipe 6 in a gas-liquid two-phase state.

The operation of the first indoor unit B will be explained using FIG. 6. In step 90, it is determined whether one of the second indoor units C and D is in a heating operation, and if it is in a heating operation, the process proceeds to step 93, where the first indoor unit B performs a heating operation. Further, if neither of the second indoor units C and D is in heating operation, the process proceeds to step 91. In step 91, it is determined whether one of the second indoor units C and D is in a cooling operation, and if it is in a cooling operation, the process proceeds to step 94, where the first indoor unit B performs a cooling operation. Further, if neither of the second indoor units C and D is in the cooling operation, the process proceeds to step 92. In step 92, it is determined whether one of the second indoor units C and D is in the ventilation operation, and if it is in the ventilation operation, the process proceeds to step 95.
Indoor unit B performs ventilation operation. In addition, the second indoor unit C,
If none of D is operating, step 9
6, the first indoor unit B stops.

In this way, 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 even one of the second indoor units C and D is in heating operation, the first indoor unit B will be in heating operation, and the cold outdoor air sucked into the first indoor unit B will be transferred to the first indoor unit B. The indoor heat exchanger 5 of the machine B warms it up to about room temperature, for example, and supplies it to the second indoor units C and D. In this case, since the cold outdoor air is warmed by the first indoor unit B to, for example, room temperature, an increase in the heating load on the second indoor units C and D due to the introduction of outdoor air can be suppressed. . here,
For example, even if the second indoor unit C is for heating and the second indoor unit D is for cooling, the first indoor unit B can warm the cold outdoor air, which would generate a heating load, to about room temperature, for example. Therefore, it does not lead to an increase in the cooling load of the second indoor unit D that is in cooling operation. Furthermore, if neither of the second indoor units C and D is in the heating operation, and one of them is in the cooling operation, the first indoor unit B is in the cooling operation, and the first indoor unit B is The outdoor air taken in is cooled by the indoor heat exchanger 5 of the first indoor unit B, and then supplied to the second indoor units C and D. In this case, since the outdoor air is cooled by the first indoor unit B, an increase in the cooling load on the second indoor units C and D due to the introduction of outdoor air can be suppressed. Furthermore, if neither of the second indoor units C and D is in heating mode nor in cooling mode, and either one is in blowing mode, the first indoor unit B is in blowing mode and introduces outdoor air. Ventilation is provided.

Example 2. In the above embodiment, a three-way switching valve 8 is provided to connect the first connection pipes 6b, 6c, 6 on the indoor unit side.
d and the first connection pipe 6 or the second connection pipe 7, and as shown in FIG. Similar effects can be obtained even if the connection is switchable in this way.

[0040]

[Effects of the Invention] As explained above, the air conditioner of the present invention includes one heat source machine including a compressor, a four-way switching valve, a heat exchanger on the heat source machine side, an accumulator, etc., an indoor heat exchanger, a first A plurality of indoor units comprising a flow rate control device, etc. 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 connection. A first branching section having a switching valve that is switchably connected to a pipe or a second connection pipe, and the other of the indoor heat exchangers of the plurality of indoor units, and the first flow rate control device. A second branch part connected to the second connection pipe via a second flow rate control device, wherein one of the plurality of indoor units sucks outdoor air and supplies the air to the indoor unit. A first indoor unit that passes through the inner heat exchanger and supplies the air as primary air for indoor heat exchange in other indoor units, and from the first indoor unit to the primary side of the indoor heat exchanger. Since the second indoor unit is supplied with air, cooling and heating can be performed selectively, and one indoor unit can perform cooling and the other indoor unit can perform heating at the same time.

[0041] Furthermore, since the first indoor unit is operated or stopped in conjunction with the operation or stop of the second indoor unit, the outside air is is introduced, ventilation is performed, and the amount of ventilation can be secured. In addition, if even one second indoor unit is in heating operation, the first indoor unit is in heating operation, and there is no second indoor unit in heating operation, and If at least one second indoor unit is in cooling operation, the first indoor unit is in cooling operation, and among the second indoor units, at least one of the second indoor units is in heating operation and cooling operation. If not, and if there is at least one second indoor unit that operates as a blower, the first indoor unit is configured to perform a blower operation, so the outdoor air is supplied to the first indoor unit in advance. Since the second indoor unit performs heating or cooling processing, it is possible to suppress an increase in heating load or cooling load due to the introduction of outdoor air, and stable operation of introducing outside air is possible.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram centered on a refrigerant system of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the operating state of the air conditioner shown in FIG. 1 in only cooling or heating mode.

FIG. 3 is a diagram illustrating the operating state of the air conditioner shown in FIG. 1 mainly for heating.

FIG. 4 is a diagram illustrating a cooling-based operation state of the air conditioner shown in FIG. 1;

FIG. 5 is an overall configuration diagram centered on the 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 centered on the refrigerant system of a conventional air conditioner.

8 is a diagram illustrating the operating state of the air conditioner shown in FIG. 7 in only cooling or heating mode; FIG.

9 is a diagram illustrating the operating state of the air conditioner shown in FIG. 7 mainly for heating; FIG.

10 is a diagram illustrating the operating state of the air conditioner shown in FIG. 7 mainly for cooling; FIG.

[Explanation of symbols]

A Heat source unit B First indoor unit C, D Second indoor unit E Relay unit 1 Compressor 2 Four-way switching valve 3 Heat source side heat exchanger 4 Accumulator 5 Indoor side heat exchanger 6 First connecting pipe 7 Second connecting pipe 8 switching valve 9 first flow control device 10 first branch section 11 second branch section 12 gas-liquid separation device 13 second flow control device 14 bypass pipe 15 third flow control device 16a second Heat exchange parts 16b, 16c, 16d Third heat exchange part 17 Fourth flow rate control device

Claims (3)

[Claims] [Claim 1] One heat source device consisting of a compressor, a four-way switching valve, a heat exchanger on the heat source side, an accumulator, etc., and a plurality of indoor units consisting of an indoor heat exchanger, a first flow rate control device, etc. are connected via first and second connection pipes, and one of the indoor heat exchangers of the plurality of indoor units can be switched to the first connection pipe or the second connection pipe. A first branch portion having a switching valve connected to the first branch 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 rate control device. A first indoor unit, which is connected to a second branch section formed by a second flow rate control device via a second flow rate control device, which is equipped with an outside air introduction blower and exchanges heat with the outside air introduced by the blower;
The indoor unit includes a blower that circulates indoor air, and a second indoor unit that exchanges heat with the air that is circulated by the blower, and at least one of the second indoor units performs heating operation. In this case, an air conditioner capable of simultaneous cooling and heating operation, wherein the first indoor unit performs heating operation. [Claim 2] One heat source device consisting of a compressor, a four-way switching valve, a heat exchanger on the heat source side, an accumulator, etc., and a plurality of indoor units consisting of an indoor heat exchanger, a first flow rate control device, etc. are connected via first and second connection pipes, and one of the indoor heat exchangers of the plurality of indoor units can be switched to the first connection pipe or the second connection pipe. A first branch portion having a switching valve connected to the first branch 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 rate control device. A first indoor unit, which is connected to a second branch section formed by a second flow rate control device via a second flow rate control device, which is equipped with an outside air introduction blower and exchanges heat with the outside air introduced by the blower;
The indoor unit includes a second indoor unit that includes a blower that circulates indoor air and exchanges heat with the air that is circulated by the blower, and of the second indoor unit, a second indoor unit that performs heating operation An air conditioner capable of simultaneous cooling and heating operation, characterized in that when there is no indoor unit and there is at least one second indoor unit that performs cooling operation, the first indoor unit is operated for cooling. . [Claim 3] One heat source device consisting of a compressor, a four-way switching valve, a heat exchanger on the heat source side, an accumulator, etc., and a plurality of indoor units consisting of an indoor heat exchanger, a first flow rate control device, etc. are connected via first and second connection pipes, and one of the indoor heat exchangers of the plurality of indoor units can be switched to the first connection pipe or the second connection pipe. A first branch portion having a switching valve connected to the first branch 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 rate control device. A first indoor unit, which is connected to a second branch section formed by a second flow rate control device via a second flow rate control device, which is equipped with an outside air introduction blower and exchanges heat with the outside air introduced by the blower;
The indoor unit includes a second indoor unit that includes a blower that circulates indoor air and exchanges heat with the air that is circulated by the blower, and the second indoor unit is in heating operation or cooling operation. If there is no second indoor unit that performs ventilation operation, and there is at least one second indoor unit that performs ventilation operation, the first
An air conditioner capable of simultaneous cooling and heating operation, which is characterized by operating an indoor unit to blow air.