JP2021085541A - Refrigerant cycle system - Google Patents

Abstract

To provide a refrigerant cycle system capable of solving a problem caused by use of communication pipes of different pipe diameters as the plurality of communication pipes for connecting an indoor unit and an outdoor unit.SOLUTION: An air conditioning device 1 including a first refrigerant circuit 10 and a second refrigerant circuit 20 independent from each other, further includes: an outdoor unit 2 common to the first refrigerant circuit 10 and the second refrigerant circuit 20; first to fourth indoor units 6, 7, 8, 9 connected to the outdoor unit; and first to fourth gas-side refrigerant communication pipes 66, 76, 86, 96 connecting the outdoor unit 2 and the first to fourth indoor units 6, 7, 8, 9. The first to fourth gas-side refrigerant communication pipes 66, 76, 86, 96 include two or more kinds of pipe diameters, and at least high order two pipes of large pipe diameters among the first to fourth gas-side refrigerant communication pipes 66, 76, 86, 96 belong to the refrigerant circuits different from each other.SELECTED DRAWING: Figure 1

Description

Regarding the refrigerant cycle system.

Conventionally, a refrigerant cycle system including a plurality of refrigerant circuits configured by connecting a plurality of indoor units to one outdoor unit has been used.

For example, in the air conditioner described in Patent Document 1 (Japanese Unexamined Patent Publication No. 2009-174759), it has been proposed to treat a load in a plurality of rooms by a plurality of refrigerant circuits commonly using an outdoor heat exchanger. There is.

In the air conditioner described in Patent Document 1, any problems that occur when connecting pipes having different pipe diameters are used as a plurality of connecting pipes connecting the indoor unit and the outdoor unit among the plurality of refrigerant circuits have been studied. Absent.

The refrigerant cycle system according to the first aspect is a refrigerant cycle system including a plurality of refrigerant circuits independent of each other, and includes a heat source side unit, a plurality of utilization side units, and a plurality of gas refrigerant communication pipes. .. The heat source side unit is commonly used in a plurality of refrigerant circuits. Each of the plurality of user-side units is connected to the heat source-side unit. A plurality of gas-refrigerant connecting pipes connect a heat source side unit and a plurality of user side units. The plurality of gas-refrigerant connecting pipes include two or more types of pipe diameters. Of the plurality of gas-refrigerant connecting pipes, at least the upper two pipes having a large pipe diameter belong to different refrigerant circuits.

The heat source side unit commonly used in the plurality of refrigerant circuits may be a heat source side unit including a part of each of the refrigerant circuits that are independent of each other. For example, the heat source side unit may be a unit having each of the heat source side heat exchangers belonging to each refrigerant circuit, or may have each of the compressors belonging to each refrigerant circuit. It may be unitized. Here, when each of the heat source side heat exchangers belonging to each refrigerant circuit is provided and unitized, each of the heat source side heat exchangers belonging to each refrigerant circuit has separate heat transfer fins. It may be an exchanger, or may have a common heat transfer fin in the heat source side heat exchanger belonging to each refrigerant circuit.

If the plurality of refrigerant circuits of the refrigerant cycle system have a plurality of pipes having a pipe diameter smaller than that of the "upper two pipes having a large pipe diameter", the pipes having the plurality of small pipe diameters are used. Is preferably divided into two or more refrigerant circuits.

If there are a plurality of "top two pipes with a large pipe diameter" that have the second largest pipe diameter among the plurality of gas-refrigerant connecting pipes, any one of them should be selected as the "top two pipes with a large pipe diameter". It can correspond to "two".

In this refrigerant cycle system, of the plurality of gas-refrigerant connecting pipes, at least the upper two pipes having a large pipe diameter do not belong to the same refrigerant circuit but belong to different refrigerant circuits. Therefore, it is possible to keep the bias of the capacity in the plurality of refrigerant circuits small.

The refrigerant cycle system according to the second aspect is the refrigerant cycle system according to the first aspect, and among the plurality of gas-refrigerant connecting pipes, at least the lower two pipes having a smaller pipe diameter belong to different refrigerant circuits.

If, among the plurality of gas-refrigerant connecting pipes, there are a plurality of "lower two pipes having a smaller pipe diameter" having a pipe diameter second from the bottom, any one of them can be selected as the "pipe diameter". It can be applied to "small lower two".

In this refrigerant cycle system, among a plurality of gas-refrigerant connecting pipes, at least the upper two large pipes having a small pipe diameter do not belong to the same refrigerant circuit but belong to different refrigerant circuits. Therefore, it is possible to suppress the bias of the capacity in the plurality of refrigerant circuits to be smaller.

The refrigerant cycle system according to the third aspect is the refrigerant cycle system according to the first aspect or the second aspect, and the plurality of refrigerant circuits include a first refrigerant circuit and a second refrigerant circuit. The first refrigerant circuit has a plurality of gas-refrigerant connecting pipes including two or more types of pipe diameters. The second refrigerant circuit has a plurality of gas-refrigerant connecting pipes including two or more types of pipe diameters. In the heat source side unit, the closing valve of the gas refrigerant connecting pipe having the minimum pipe diameter of the first refrigerant circuit is arranged at a position lower than the closing valve of the gas refrigerant connecting pipe having the minimum pipe diameter of the second refrigerant circuit. .. In the heat source side unit, the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the second refrigerant circuit is arranged at a position lower than the closing valve of the gas refrigerant connecting pipe having the minimum pipe diameter of the first refrigerant circuit. ..
In the heat source side unit, the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the first refrigerant circuit is arranged at a position lower than the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the second refrigerant circuit. ..

The closing valve of the gas refrigerant connecting pipe having the minimum piping diameter of the second refrigerant circuit, the closing valve of the gas refrigerant connecting pipe having the minimum piping diameter of the first refrigerant circuit, and the maximum piping diameter of the second refrigerant circuit. The closing valve of the gas refrigerant connecting pipe and the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the first refrigerant circuit are arranged side by side in order from the top without any other closing valve intervening between the closing valves. It may be arranged in order from the top with another closing valve intervening between the closing valves.

In this refrigerant cycle system, it is possible to suppress the unevenness of the capacities due to the difference in the height positions of the plurality of closing valves between the first refrigerant circuit and the second refrigerant circuit.

The refrigerant cycle system according to the fourth aspect is the refrigerant cycle system according to the first aspect or the second aspect, and the plurality of refrigerant circuits include a first refrigerant circuit and a second refrigerant circuit. The first refrigerant circuit has a plurality of gas-refrigerant connecting pipes including two or more types of pipe diameters. The second refrigerant circuit has a plurality of gas-refrigerant connecting pipes including two or more types of pipe diameters. In the heat source side unit, the closing valve of the gas refrigerant connecting pipe having the minimum pipe diameter of the second refrigerant circuit is arranged at a position lower than the closing valve of the gas refrigerant connecting pipe having the minimum pipe diameter of the first refrigerant circuit. .. In the heat source side unit, the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the second refrigerant circuit is arranged at a position lower than the closing valve of the gas refrigerant connecting pipe having the minimum pipe diameter of the second refrigerant circuit. .. In the heat source side unit, the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the first refrigerant circuit is arranged at a position lower than the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the second refrigerant circuit. ..

The closing valve of the gas refrigerant connecting pipe having the minimum piping diameter of the first refrigerant circuit, the closing valve of the gas refrigerant connecting pipe having the minimum piping diameter of the second refrigerant circuit, and the maximum piping diameter of the second refrigerant circuit. The closing valve of the gas refrigerant connecting pipe and the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the first refrigerant circuit are arranged side by side in order from the top without any other closing valve intervening between the closing valves. It may be arranged in order from the top with another closing valve intervening between the closing valves.

In this refrigerant cycle system, a first refrigerant circuit is provided between a closing valve of a gas refrigerant connecting pipe having a minimum piping diameter of a second refrigerant circuit and a closing valve of a gas refrigerant connecting pipe having a maximum piping diameter of a second refrigerant circuit. Since neither the closing valve of the gas refrigerant connecting pipe having the minimum pipe diameter nor the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the first refrigerant circuit is located, the heat between the first refrigerant circuit and the second refrigerant circuit is not located. It becomes possible to keep the exchange of the refrigerant small.

For example, even when the cooling operation and the heating operation are performed in the first refrigerant circuit and the second refrigerant circuit, the closing valve and the second refrigerant of the gas refrigerant connecting pipe having the minimum pipe diameter of the second refrigerant circuit. By not locating the closing valve of the gas-refrigerant connecting pipe of the first refrigerant circuit between the closing valves of the gas-refrigerant connecting pipe of the maximum pipe diameter of the circuit, or by not locating the closing valve of the gas-refrigerant connecting pipe of the second refrigerant circuit, or the gas of the minimum pipe diameter of the second refrigerant circuit. The closing valve of the refrigerant connecting pipe and the closing valve of the gas refrigerant connecting pipe having the maximum pipe diameter of the second refrigerant circuit are close to each other, so that the closing valve is between the first refrigerant circuit and the second refrigerant circuit. The transfer of heat in the air can be kept small.

The refrigerant cycle system according to the fifth aspect is any of the refrigerant cycle systems from the first aspect to the fourth aspect, and each of the plurality of refrigerant circuits has a compressor having the same capacity.

In this refrigerant cycle system, of the plurality of gas-refrigerant connecting pipes, at least the upper two pipes having a large pipe diameter belong to separate refrigerant circuits having compressors having the same capacity. Therefore, it is possible to suppress an increase in the bias of the capacity because the upper two pipes having a large pipe diameter belong to one of the refrigerant circuits having the same capacity.

It is a schematic block diagram of an air conditioner. It is the schematic explanatory drawing of the outdoor heat exchanger. It is an external perspective view of an outdoor unit. It is a layout explanatory view of the closing valve of the outdoor unit. It is a layout explanatory view of the closing valve of the outdoor unit which concerns on another Embodiment B.

(1) Configuration of Air Conditioning Device The air conditioning device 1 will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an air conditioner 1 according to an embodiment of the present disclosure. The air conditioner 1 (an example of a refrigerant cycle system) is a two-system refrigeration system having a first refrigerant circuit 10 and a second refrigerant circuit 20, which are two independent refrigerant circuits so that the refrigerants do not come and go from each other. It has a cycle. The air conditioning device 1 of the present embodiment is a device that cools and heats the air-conditioned space by performing a vapor compression refrigeration cycle in each of the first refrigerant circuit 10 and the second refrigerant circuit 20.

As shown in FIG. 1, the air conditioner 1 mainly includes an outdoor unit 2, a first indoor unit 6 and a second indoor unit 7 as a plurality of indoor units, a third indoor unit 8 and a fourth indoor unit 9. The first liquid side refrigerant connecting pipe 65, the first gas side refrigerant connecting pipe 66, the second liquid side refrigerant connecting pipe 75, the second gas side refrigerant connecting pipe 76, and the third liquid side refrigerant connecting pipe 85. A third gas side refrigerant connecting pipe 86, a fourth liquid side refrigerant connecting pipe 95, a fourth gas side refrigerant connecting pipe 96, and a control unit 50 are provided.

The first indoor unit 6 and the outdoor unit 2 are connected to each other via the first liquid side refrigerant connecting pipe 65 and the first gas side refrigerant connecting pipe 66 to form a part of the first refrigerant circuit 10. .. Further, the second indoor unit 7 and the outdoor unit 2 are connected to each other via the second liquid side refrigerant connecting pipe 75 and the second gas side refrigerant connecting pipe 76, so that the other one of the first refrigerant circuits 10 is connected. Make up the part. In this way, the first refrigerant circuit 10 is configured such that the first indoor unit 6 and the second indoor unit 7 are connected in parallel with each other with respect to the outdoor unit 2. The first refrigerant circuit 10 is filled with R32, which is a refrigerant classified as slightly flammable (A2L) by ISO817, so as to have an amount of less than 1.84 kg.

The third indoor unit 8 and the outdoor unit 2 are connected to each other via the third liquid side refrigerant connecting pipe 85 and the third gas side refrigerant connecting pipe 86 to form a part of the second refrigerant circuit 20. .. Further, the fourth indoor unit 9 and the outdoor unit 2 are connected to each other via the fourth liquid side refrigerant connecting pipe 95 and the fourth gas side refrigerant connecting pipe 96, so that the other one of the second refrigerant circuits 20 is connected. Make up the part. In this way, the second refrigerant circuit 20 is configured such that the third indoor unit 8 and the fourth indoor unit 9 are connected in parallel to the outdoor unit 2. Also in this second refrigerant circuit 20, R32, which is a refrigerant classified as slightly flammable (A2L) by ISO817, is filled so as to have an amount of less than 1.84 kg.

The first liquid side refrigerant connecting pipe 65, the second liquid side refrigerant connecting pipe 75, the third liquid side refrigerant connecting pipe 85, and the fourth liquid side refrigerant connecting pipe 95 are included in each of the indoor units 6 to 9 connected to each other. Those having a pipe diameter corresponding to the capacity of each indoor heat exchanger 61, 71, 81, 91 are used. The diameter of each liquid-side refrigerant connecting pipe is smaller than the diameter of the gas-side refrigerant connecting pipe paired for each indoor unit.

Each of the indoor units 6 to 9 to be connected also has the first gas side refrigerant connecting pipe 66, the second gas side refrigerant connecting pipe 76, the third gas side refrigerant connecting pipe 86, and the fourth gas side refrigerant connecting pipe 96, respectively. Those having a pipe diameter corresponding to the capacity of each indoor heat exchanger 61, 71, 81, 91 are used. In particular, in the present embodiment, the pipe diameter of the first gas side refrigerant connecting pipe 66 and the pipe diameter of the second gas side refrigerant connecting pipe 76 are different, and the pipe diameter of the first gas side refrigerant connecting pipe 66 is the first. 2 It is larger than the pipe diameter of the gas side refrigerant connecting pipe 76. Further, the pipe diameter of the third gas side refrigerant connecting pipe 86 and the pipe diameter of the fourth gas side refrigerant connecting pipe 96 are different, and the pipe diameter of the third gas side refrigerant connecting pipe 86 is the fourth gas side refrigerant connecting pipe 86. It is larger than the pipe diameter of the pipe 96. Further, in the present embodiment, the pipe diameter of the first gas side refrigerant connecting pipe 66 is larger than the pipe diameter of the third gas side refrigerant connecting pipe 86, and the pipe diameter of the third gas side refrigerant connecting pipe 86 is larger. It is larger than the pipe diameter of the second gas side refrigerant connecting pipe 76, and the pipe diameter of the second gas side refrigerant connecting pipe 76 is larger than the pipe diameter of the fourth gas side refrigerant connecting pipe 96.

(1-1) Outdoor unit The outdoor unit 2 is installed outside the air-conditioned space, for example, on the roof of a building or near the wall surface of a building.

The outdoor unit 2 includes a part of the first refrigerant circuit 10, a part of the second refrigerant circuit 20, an outdoor heat exchanger 30 commonly used in the first refrigerant circuit 10 and the second refrigerant circuit 20, and an outdoor unit. It has a fan 30a and.

The outdoor fan 30a is one fan for supplying outdoor air to the outdoor heat exchanger 30 commonly used in the first refrigerant circuit 10 and the second refrigerant circuit 20. The outdoor fan 30a is controlled to be driven by the control unit 50 when the refrigerant is flowing in either the first refrigerant circuit 10 or the second refrigerant circuit 20.

The first refrigerant circuit 10 mainly includes a first compressor 11, a first four-way switching valve 12, a first accumulator 13, an outdoor heat exchanger 30, a first liquid pipe 14a, a second liquid pipe 14b, and a first expansion valve. 15a, 2nd expansion valve 15b, 1st liquid side closing valve 16a, 2nd liquid side closing valve 16b, 1st gas pipe 17a, 2nd gas pipe 17b, 1st gas side closing valve 18a, 2nd gas side closing valve It has 18b.

A first port, which is one of the connection ports of the first four-way switching valve 12, is connected to the suction side of the first compressor 11 via the first accumulator 13. A second port, which is one of the connection ports of the first four-way switching valve 12, is connected to the discharge side of the first compressor 11. A refrigerant pipe extending toward the outdoor heat exchanger 30 is connected to the third port, which is one of the connection ports of the first four-way switching valve 12. A refrigerant pipe extending toward the first gas side closing valve 18a and the second gas side closing valve 18b is connected to the fourth port, which is one of the connection ports of the first four-way switching valve 12. The refrigerant pipe is branched into a first gas pipe 17a and a second gas pipe 17b. A first gas side closing valve 18a is provided at the end of the first gas pipe 17a. A second gas side closing valve 18b is provided at the end of the second gas pipe 17b. In the first refrigerant circuit 10, the refrigerant pipe connected to the side of the outdoor heat exchanger 30 opposite to the first four-way switching valve 12 side is branched into the first liquid pipe 14a and the second liquid pipe 14b. .. A first expansion valve 15a is provided in the middle of the first liquid pipe 14a, and a first liquid side closing valve 16a is provided at the end of the first liquid pipe 14a. A second expansion valve 15b is provided in the middle of the second liquid pipe 14b, and a second liquid side closing valve 16b is provided at the end of the second liquid pipe 14b.

The first four-way switching valve 12 is in a cooling operation state (a cooling operation state) in which the refrigerant discharged from the first compressor 11 is sent to the outdoor heat exchanger 30 by switching the connection state of the first to fourth ports by the control unit 50. (Refer to the broken line in the first four-way switching valve 12 in FIG. 1) and the heating operation state in which the first compressor 11 sucks the refrigerant flowing from the outdoor heat exchanger 30 (first four-way switching valve 12 in FIG. 1). (Refer to the solid line in), and can be switched to.

The second refrigerant circuit 20 mainly includes a second compressor 21, a second four-way switching valve 22, a second accumulator 23, an outdoor heat exchanger 30, a third liquid pipe 24a, a fourth liquid pipe 24b, and a third expansion valve. 25a, 4th expansion valve 25b, 3rd liquid side closing valve 26a, 4th liquid side closing valve 26b, 3rd gas pipe 27a, 4th gas pipe 27b, 3rd gas side closing valve 28a, 4th gas side closing valve It has 28b.

A fifth port, which is one of the connection ports of the second four-way switching valve 22, is connected to the suction side of the second compressor 21 via the second accumulator 23. A sixth port, which is one of the connection ports of the second four-way switching valve 22, is connected to the discharge side of the second compressor 21. A refrigerant pipe extending toward the outdoor heat exchanger 30 is connected to the seventh port, which is one of the connection ports of the second four-way switching valve 22. A refrigerant pipe extending toward the third gas side closing valve 28a and the fourth gas side closing valve 28b is connected to the eighth port, which is one of the connection ports of the second four-way switching valve 22. The refrigerant pipe is branched into a third gas pipe 27a and a fourth gas pipe 27b. A third gas side closing valve 28a is provided at the end of the third gas pipe 27a. A fourth gas side closing valve 28b is provided at the end of the fourth gas pipe 27b. In the second refrigerant circuit 20, the refrigerant pipe connected to the side of the outdoor heat exchanger 30 opposite to the second four-way switching valve 22 side is branched into the third liquid pipe 24a and the fourth liquid pipe 24b. .. A third expansion valve 25a is provided in the middle of the third liquid pipe 24a, and a third liquid side closing valve 26a is provided at the end of the third liquid pipe 24a. A fourth expansion valve 25b is provided in the middle of the fourth liquid pipe 24b, and a fourth liquid side closing valve 26b is provided at the end of the fourth liquid pipe 24b.

The second four-way switching valve 22 is in a cooling operation state (a cooling operation state) in which the refrigerant discharged from the second compressor 21 is sent to the outdoor heat exchanger 30 by switching the connection state of the fifth to eighth ports by the control unit 50. (Refer to the broken line in the second four-way switching valve 22 in FIG. 1) and the heating operation state in which the second compressor 21 sucks the refrigerant flowing from the outdoor heat exchanger 30 (second four-way switching valve 22 in FIG. 1). (Refer to the solid line in), and can be switched to.

Here, the capacity of the first compressor 11 of the first refrigerant circuit 10 and the capacity of the second compressor 21 of the second refrigerant circuit 20 are equal to each other. For example, in the case of a variable capacity compressor, it means that the cylinder volumes are equal.

(1-2) Indoor Unit In the present embodiment, the first indoor unit 6, the second indoor unit 7, the third indoor unit 8 and the fourth indoor unit 9 are provided as a plurality of indoor units. Each indoor unit is provided in an independent or continuous space, and may be a ceiling-embedded type, a ceiling-hung type, a wall-mounted type, or a floor-standing type unit.

The first chamber unit 6 mainly has a first chamber heat exchanger 61, a first chamber fan 62, and a first remote controller 63. The first chamber fan 62 forms an air flow in which the first chamber unit 6 takes in the air in the target space and returns it to the target space through the first chamber heat exchanger 61. The liquid refrigerant side of the first indoor heat exchanger 61 is connected to the first liquid side closing valve 16a of the outdoor unit 2 via the first liquid side refrigerant connecting pipe 65. The gas refrigerant side of the first indoor heat exchanger 61 is connected to the first gas side closing valve 18a of the outdoor unit 2 via the first gas side refrigerant connecting pipe 66. The first remote controller 63 is communicably connected to the control unit 50 and receives various operation commands from the user.

The second chamber unit 7 mainly has a second chamber heat exchanger 71, a second chamber fan 72, and a second remote controller 73. The second chamber fan 72 forms an air flow in which the second chamber unit 7 takes in the air in the target space and returns it to the target space through the second chamber heat exchanger 71. The liquid refrigerant side of the second indoor heat exchanger 71 is connected to the second liquid side closing valve 16b of the outdoor unit 2 via the second liquid side refrigerant connecting pipe 75. The gas refrigerant side of the second indoor heat exchanger 71 is connected to the second gas side closing valve 18b of the outdoor unit 2 via the second gas side refrigerant connecting pipe 76. The second remote controller 73 is communicably connected to the control unit 50 and receives various operation commands from the user.

The third chamber unit 8 mainly has a third chamber heat exchanger 81, a third chamber fan 82, and a third remote controller 83. The third chamber fan 82 forms an air flow in which the third chamber unit 8 takes in the air in the target space and returns it to the target space through the third chamber heat exchanger 81. The liquid refrigerant side of the third indoor heat exchanger 81 is connected to the third liquid side closing valve 26a of the outdoor unit 2 via the third liquid side refrigerant connecting pipe 85. The gas refrigerant side of the third indoor heat exchanger 81 is connected to the third gas side closing valve 28a of the outdoor unit 2 via the third gas side refrigerant connecting pipe 86. The third remote controller 83 is communicably connected to the control unit 50 and receives various operation commands from the user.

The fourth chamber unit 9 mainly has a fourth chamber heat exchanger 91, a fourth chamber fan 92, and a fourth remote controller 93. The fourth chamber fan 92 forms an air flow in which the fourth chamber unit 9 takes in the air in the target space and returns it to the target space through the fourth chamber heat exchanger 91. The liquid refrigerant side of the fourth indoor heat exchanger 91 is connected to the fourth liquid side closing valve 26b of the outdoor unit 2 via the fourth liquid side refrigerant connecting pipe 95. The gas refrigerant side of the fourth indoor heat exchanger 91 is connected to the fourth gas side closing valve 28b of the outdoor unit 2 via the fourth gas side refrigerant connecting pipe 96. The fourth remote controller 93 is communicably connected to the control unit 50 and receives various operation commands from the user.

(1-3) Control unit The control unit 50 is a functional unit that controls the operation of various devices constituting the air conditioner 1.

The control unit 50 is provided, for example, in the outdoor control unit (not shown) of the outdoor unit 2, the first indoor unit 6, the second indoor unit 7, the third indoor unit 8, and the fourth indoor unit 9, respectively. The indoor control unit (not shown) is connected and configured to be communicable via a transmission line (not shown). The outdoor control unit and each indoor control unit are, for example, a microcomputer or a unit having a memory that can be executed by the microcomputer and stores various programs for controlling the air conditioner 1. In FIG. 1, for convenience, the control unit 50 is drawn at a position away from the outdoor unit 2, the first indoor unit 6, the second indoor unit 7, the third indoor unit 8, and the fourth indoor unit 9.

The control unit 50 includes an outdoor fan 30a, a first compressor 11, a first four-way switching valve 12, a first expansion valve 15a, a second expansion valve 15b, a second compressor 21, a second four-way switching valve 22, and a second. It is electrically connected to various devices such as the 3 expansion valve 25a and the 4th expansion valve 25b. Further, the control unit 50 is electrically connected to various sensors (not shown). Further, as described above, the control unit 50 is communicably connected to the first remote controller 63, the second remote controller 73, the third remote controller 83, and the fourth remote controller 93 operated by the user of the air conditioner 1. ..

The control unit 50 starts and stops the air conditioner 1 based on measurement signals of various sensors, commands received from the first remote controller 63, the second remote controller 73, the third remote controller 83, the fourth remote controller 93, and the like. It controls the operation of various devices constituting the air conditioner 1.

(2) Configuration of Outdoor Heat Exchanger FIG. 2 is a schematic explanatory view of the outdoor heat exchanger 30.

The outdoor heat exchanger 30 includes a plurality of first heat transfer tubes 31, a plurality of second heat transfer tubes 32, a plurality of heat transfer fins 33, a first gas header 34, a second gas header 35, and a first shunt 36. And a second shunt 37.

The plurality of heat transfer fins 33 are arranged so as to be arranged in the plate thickness direction, which is the paper surface direction in FIG. 2, and the plurality of first heat transfer tubes 31 and the plurality of second heat transfer tubes 32 penetrate. The heat transfer fin 33 is provided with an upwind heat transfer tube insertion portion arranged vertically on the leeward side in the air flow direction and a leeward heat transfer tube insertion portion arranged vertically on the leeward side in the air flow direction. ..

The first gas header 34 is a header belonging to the first refrigerant circuit 10, and is provided on the gas side of a plurality of first heat transfer tubes 31 in the refrigerant flow path of the first refrigerant circuit 10. When the first refrigerant circuit 10 is in the cooling operation state, the first gas header 34 divides and supplies the gas refrigerant to a plurality of flow paths composed of the plurality of first heat transfer tubes 31. Further, when the first refrigerant circuit 10 is in the heating operation state (see the arrow of the refrigerant flow in FIG. 2), the first gas header 34 flows through a plurality of flow paths composed of a plurality of first heat transfer tubes 31. Combine the gas refrigerant.

The second gas header 35 is a header belonging to the second refrigerant circuit 20, and is provided on the gas side of a plurality of second heat transfer tubes 32 in the refrigerant flow path of the second refrigerant circuit 20. When the second refrigerant circuit 20 is in the cooling operation state, the second gas header 35 divides and supplies the gas refrigerant to a plurality of flow paths composed of the plurality of second heat transfer tubes 32. Further, when the second refrigerant circuit 20 is in the heating operation state (see the arrow of the refrigerant flow in FIG. 2), the second gas header 35 flows through a plurality of flow paths composed of a plurality of second heat transfer tubes 32. Combine the gas refrigerant.

The first shunt 36 is a shunt belonging to the first refrigerant circuit 10, and is provided on the liquid side of a plurality of first heat transfer tubes 31 in the refrigerant flow path of the first refrigerant circuit 10. When the first refrigerant circuit 10 is in the cooling operation state, the first shunt 36 merges the liquid refrigerants that have flowed through the plurality of flow paths of the plurality of first heat transfer tubes 31. Further, when the first refrigerant circuit 10 is in the heating operation state (see the arrow of the refrigerant flow in FIG. 2), the first shunt 36 is connected to a plurality of flow paths composed of a plurality of first heat transfer tubes 31. , Liquid refrigerant is shunted and supplied.

The second shunt 37 is a shunt belonging to the second refrigerant circuit 20, and is provided on the liquid side of a plurality of second heat transfer tubes 32 in the refrigerant flow path of the second refrigerant circuit 20. When the second refrigerant circuit 20 is in the cooling operation state, the second shunt 37 merges the liquid refrigerants that have flowed through the plurality of flow paths of the plurality of second heat transfer tubes 32. Further, when the second refrigerant circuit 20 is in the heating operation state (see the arrow of the refrigerant flow in FIG. 2), the second shunt 37 is connected to a plurality of flow paths composed of a plurality of second heat transfer tubes 32. , Liquid refrigerant is shunted and supplied.

The plurality of first heat transfer tubes 31 are heat transfer tubes belonging to the first refrigerant circuit 10, and the refrigerant flowing through the first refrigerant circuit 10 passes through the first heat transfer tubes 31. The refrigerant flowing through the first refrigerant circuit 10 is in a parallel relationship with each other in the outdoor heat exchanger 30, and flows in a plurality of flow paths corresponding to the number of pipes connected to the first shunt 36. Specifically, each flow path corresponding to the number of pipes connected to the first shunt 36 is connected so that the ends of the first heat transfer pipe 31 are folded back via a U-shaped pipe or the like, and gas. It has a branching part at a position closer to the side. In the present embodiment, in each flow path corresponding to the number of pipes connected to the first shunt 36, the number of the first heat transfer tubes 31 on the liquid refrigerant side of the branch portion and the number of the first heat transfer tubes 31 on the liquid refrigerant side of the branch portion are larger than those of the branch portion. The total number of first heat transfer tubes 31 separated on the gas refrigerant side is equal to the total number of the first heat transfer tubes 31. Further, in the present embodiment, the plurality of first heat transfer tubes 31 are arranged so that the first heat transfer tubes 31 do not overlap each other in the air flow direction.

The plurality of second heat transfer tubes 32 are heat transfer tubes belonging to the second refrigerant circuit 20, and the refrigerant flowing through the second refrigerant circuit 20 passes through the second heat transfer tubes 32. The refrigerant flowing through the second refrigerant circuit 20 is in a parallel relationship with each other in the outdoor heat exchanger 30, and flows in a plurality of flow paths corresponding to the number of pipes connected to the second shunt 37. Specifically, in each flow path corresponding to the number of pipes connected to the second shunt 37, the ends of the second heat transfer pipe 32 are folded back via a U-shaped pipe or the like. While being connected, it has a branch portion at a position closer to the gas side. In the present embodiment, in each flow path corresponding to the number of pipes connected to the second shunt 37, the number of the second heat transfer tubes 32 on the liquid refrigerant side of the branch portion and the number of the second heat transfer tubes 32 on the liquid refrigerant side are larger than those of the branch portion. It is configured so that the total number of the second heat transfer tubes 32 separated on the gas refrigerant side is the same. Further, in the present embodiment, the plurality of second heat transfer tubes 32 are arranged so that the second heat transfer tubes 32 do not overlap each other in the air flow direction.

As shown in FIG. 2, a plurality of first heat transfer tubes 31 are configured, and each flow path corresponding to the number of pipes connected to the first shunt 36 is composed of a plurality of second heat transfer tubes 32. It is provided so as to intersect with any one of the flow paths corresponding to the number of pipes connected to the second shunt 37 in a one-to-one correspondence. Specifically, in the outdoor heat exchanger 30 of the present embodiment, the plurality of flow paths formed by the plurality of first heat transfer tubes 31 and the plurality of flow paths formed by the plurality of second heat transfer tubes 32 are 1. It corresponds to one-to-one, and is provided so as to intersect once within the width of the heat transfer fins 33 when viewed from the direction in which the first heat transfer tube 31 and the second heat transfer tube 32 extend. .. In the outdoor heat exchanger 30 of the present embodiment, in the air flow direction, where the first heat transfer tube 31 is arranged on the leeward side, the second heat transfer tube 32 is arranged on the leeward side of the first heat transfer tube 31. Where the heat tube 31 is arranged on the leeward side, the second heat transfer tube 32 is arranged on the leeward side. Further, in the outdoor heat exchanger 30 of the present embodiment, a plurality of heat transfer tubes are arranged so as to overlap each other in the direction of air flow.

In the present embodiment, as shown in the refrigerant flow in the heating operation state of FIG. 2, when both the first refrigerant circuit 10 and the second refrigerant circuit 20 are in the heating operation state, the refrigerant in the outdoor heat exchanger 30 The outdoor heat exchanger 30 and the outdoor fan 30a are provided so that the flow direction is parallel to the direction of the air flow supplied from the outdoor fan 30a to the outdoor heat exchanger 30.

(3) Arrangement of Closing Valves in the Outdoor Unit FIG. 3 is an external perspective view of the outdoor unit 2. FIG. 4 is an explanatory view of the arrangement of the closing valve of the outdoor unit 2.

The outdoor unit 2 includes the above components (outdoor heat exchanger 30, outdoor fan 30a, first compressor 11, first four-way switching valve 12, first accumulator 13, outdoor heat exchanger 30, first liquid piping 14a). , 2nd liquid pipe 14b, 1st expansion valve 15a, 2nd expansion valve 15b, 1st liquid side closing valve 16a, 2nd liquid side closing valve 16b, 1st gas pipe 17a, 2nd gas pipe 17b, 1st gas Side closing valve 18a, second gas side closing valve 18b, second compressor 21, second four-way switching valve 22, second accumulator 23, outdoor heat exchanger 30, third liquid pipe 24a, fourth liquid pipe 24b, Third expansion valve 25a, fourth expansion valve 25b, third liquid side closing valve 26a, fourth liquid side closing valve 26b, third gas pipe 27a, fourth gas pipe 27b, third gas side closing valve 28a, and It has an outdoor casing 40 which is a substantially rectangular housing for accommodating the fourth gas side closing valve 28b).

The outdoor casing 40 includes a first liquid side closing valve 16a, a second liquid side closing valve 16b, a first gas side closing valve 18a, a second gas side closing valve 18b, a third liquid side closing valve 26a, and a fourth liquid side. A closing valve 26b, a third gas side closing valve 28a, and a closing valve cover 41 that covers the fourth gas side closing valve 28b from the side are provided. The rear of the closing valve cover 41 is open for passing each connecting pipe connected to each closing valve. Here, the first liquid side refrigerant connecting pipe 65 is connected to the first liquid side closing valve 16a, the second liquid side refrigerant connecting pipe 75 is connected to the second liquid side closing valve 16b, and the first gas side is closed. The first gas side refrigerant connecting pipe 66 is connected to the valve 18a, the second gas side refrigerant connecting pipe 76 is connected to the second gas side closing valve 18b, and the third liquid side closing valve 26a is connected to the third liquid side. The refrigerant connecting pipe 85 is connected, the fourth liquid side refrigerant connecting pipe 95 is connected to the fourth liquid side closing valve 26b, and the third gas side refrigerant connecting pipe 86 is connected to the third gas side closing valve 28a. A fourth gas side refrigerant connecting pipe 96 is connected to the fourth gas side closing valve 28b.

1st liquid side closing valve 16a, 2nd liquid side closing valve 16b, 1st gas side closing valve 18a, 2nd gas side closing valve 18b, 3rd liquid side closing valve 26a, 4th liquid side closing valve 26b, 3rd The gas-side closing valve 28a and the fourth gas-side closing valve 28b are fixed to a closing valve support plate 42 made of sheet metal fixed to the bottom plate of the outdoor casing 40. Specifically, in order from the bottom, a pair of the first liquid side closing valve 16a and the first gas side closing valve 18a, a pair of the second liquid side closing valve 16b and the second gas side closing valve 18b, and the third liquid side. The pair of the closing valve 26a and the third gas side closing valve 28a and the pair of the fourth liquid side closing valve 26b and the fourth gas side closing valve 28b are arranged in this order. In this way, the gas-side refrigerant connecting pipes connected to the gas-side closing valves are arranged so that the pipe diameter gradually decreases in order from the bottom.

Here, the first liquid side refrigerant connecting pipe 65, the second liquid side refrigerant connecting pipe 75, the third liquid side refrigerant connecting pipe 85, the fourth liquid side refrigerant connecting pipe 95, the first gas side refrigerant connecting pipe 66, and the second The gas side refrigerant connecting pipe 76, the third gas side refrigerant connecting pipe 86, and the fourth gas side refrigerant connecting pipe 96 all extend rearward from each closing valve, and then the curved portions 66R, 76R of each refrigerant connecting pipe. , 86R, 96R (in FIG. 4, only the gas side refrigerant connecting pipe side is shown by a broken line), it is bent upward, combined into one, and further extended upward.

(4) Features of the Embodiment The air conditioner 1 of the present embodiment has a plurality of indoor units of the first chamber unit 6, the second chamber unit 7, the third chamber unit 8 and the fourth chamber unit 9. , It is possible to handle the heat load at the place where each indoor unit is arranged. Here, in the air conditioner 1, the heat load processing at a plurality of locations is performed by using a plurality of independent refrigerant circuits of the first refrigerant circuit 10 and the second refrigerant circuit 20. In this way, by processing the heat load at a plurality of locations using a plurality of refrigerant circuits, the amount of refrigerant charged per refrigerant circuit can be reduced as compared with the case where one refrigerant circuit is used. Specifically, the amount of refrigerant charged per refrigerant circuit can be suppressed to less than 1.84 kg.

Therefore, even when each of the first refrigerant circuit 10 and the second refrigerant circuit 20 is filled with R32, which is a refrigerant classified as slightly flammable (A2L) by ISO817, the first refrigerant circuit 10 It is possible to reduce the amount of refrigerant leakage when refrigerant leakage occurs in any of the second refrigerant circuit 20 and the second refrigerant circuit 20. Therefore, even if the refrigerant leaks, it is possible to keep the combustibility low.

Then, in the air conditioner 1 of the present embodiment, there are four four, a first gas side refrigerant connecting pipe 66, a second gas side refrigerant connecting pipe 76, a third gas side refrigerant connecting pipe 86, and a fourth gas side refrigerant connecting pipe 96. It has a gas side refrigerant communication pipe. Among these, the first gas-side refrigerant connecting pipe 66 and the third gas-side refrigerant connecting pipe 86, which are the top two having the largest pipe diameter, belong to different refrigerant circuits. Specifically, the first gas side refrigerant connecting pipe 66 belongs to the first refrigerant circuit 10, and the third gas side refrigerant connecting pipe 86 belongs to the second refrigerant circuit 20. Therefore, it is possible to suppress the bias of the capacity between the refrigerant circuits and prevent the capacity from being insufficient or excessive in each indoor unit.

Further, the second gas-side refrigerant connecting pipe 76 and the fourth gas-side refrigerant connecting pipe 96, which are the lower two pipes having a smaller pipe diameter among the plurality of gas-side refrigerant connecting pipes, also belong to different refrigerant circuits. Specifically, the second gas side refrigerant connecting pipe 76 belongs to the first refrigerant circuit 10, and the fourth gas side refrigerant connecting pipe 96 belongs to the second refrigerant circuit 20. For this reason, it is possible to further reduce the bias in capacity between the refrigerant circuits.

In particular, in the present embodiment, since the first compressor 11 of the first refrigerant circuit 10 and the second compressor 21 of the second refrigerant circuit 20 have the same capacity, as described above, a plurality of gas-side refrigerant connecting pipes. The upper two of the larger pipe diameters are provided in different refrigerant circuits, and the lower two of the multiple gas-side refrigerant communication pipes with smaller pipe diameters are provided in different refrigerant circuits to balance the capacity of each refrigerant circuit. It is possible to make it.

Further, in the outdoor unit 2, the first gas side closing valve 18a to which the first gas side refrigerant connecting pipe 66 belonging to the first refrigerant circuit 10 is connected, and the third gas side refrigerant connecting pipe 86 belonging to the second refrigerant circuit 20. The third gas side closing valve 28a to which is connected, the second gas side closing valve 18b to which the second gas side refrigerant connecting pipe 76 belonging to the first refrigerant circuit 10 is connected, and the fourth gas side belonging to the second refrigerant circuit 20. The fourth gas side closing valve 28b to which the refrigerant connecting pipe 96 is connected is arranged in order from the bottom. Therefore, the gas-side closing valve belonging to the first refrigerant circuit 10 and the gas-side closing valve belonging to the second refrigerant circuit 20 can be arranged at staggered height positions, and the gas belonging to one of the refrigerant circuits can be arranged. It is possible to equalize the head difference between the refrigerant circuits and equalize the capacity, avoiding the structure in which only the side closing valves are arranged so as to be gathered upward or downward.

Further, each refrigerant connecting pipe extending from the outdoor unit 2 (first liquid side refrigerant connecting pipe 65, first gas side refrigerant connecting pipe 66, second liquid side refrigerant connecting pipe 75, second gas side refrigerant connecting pipe 76, third The liquid-side refrigerant connecting pipe 85, the third gas-side refrigerant connecting pipe 86, the fourth liquid-side refrigerant connecting pipe 95, and the fourth gas-side refrigerant connecting pipe 96) all extend upward from the outdoor casing 40. It is provided. Therefore, each refrigerant connecting pipe extending from the outdoor unit 2 can be guided to a higher position in the room, which is the space to be air-conditioned, or to the ceiling. As a result, in the room, each refrigerant connecting pipe is placed along the wall surface of the room to reach the indoor unit (first room unit 6, second room unit 7, third room unit 8 and fourth room unit 9). It is not necessary to pull it upward, and it is possible to make each refrigerant connecting pipe inconspicuous in the room.

In general, the larger the pipe diameter, the larger the bending radius required for bending while suppressing damage tends to be required. On the other hand, in the outdoor unit 2 of the present embodiment, the first gas side closing valve 18a to which the first gas side refrigerant connecting pipe 66 having the largest pipe diameter is connected, and the third gas side having the second largest pipe diameter. The third gas side closing valve 28a to which the refrigerant connecting pipe 86 is connected, the second gas side closing valve 18b to which the second gas side refrigerant connecting pipe 76 having the second smallest pipe diameter is connected, and the fourth having the smallest pipe diameter. The fourth gas side closing valve 28b to which the gas side refrigerant connecting pipe 96 is connected is arranged in order from the bottom. Therefore, the gas-side refrigerant connecting pipe having a relatively large pipe diameter can secure a wider space for the curved portion, and it is easy to secure a large bending radius. Therefore, it is possible to improve the workability when each gas-side refrigerant connecting pipe is bent and connected to the gas-side closing valve.

Further, the heat transfer fins 33 included in the outdoor heat exchanger 30 are penetrated by the plurality of first heat transfer tubes 31 belonging to the first refrigerant circuit 10 and the plurality of second heat transfer tubes 32 belonging to the second refrigerant circuit 20. It is attached. Therefore, in the outdoor heat exchanger 30, the refrigerant flowing through the first refrigerant circuit 10 and the second refrigerant circuit pass through the heat transfer fins 33 to which both the first heat transfer tube 31 and the second heat transfer tube 32 are attached. It is possible to transfer heat to and from the refrigerant flowing through 20. This makes it possible to utilize the capacity of one refrigerant circuit in the other refrigerant circuit between the first refrigerant circuit 10 and the second refrigerant circuit 20. For example, when the first chamber unit 6 and the second chamber unit 7 belonging to the first refrigerant circuit 10 are used for cooling the computer room and the like, the cooling operation is performed in the first refrigerant circuit 10 and the second refrigerant is used. When the heating operation is performed in the circuit 20 at the same time, heat is transferred between the first refrigerant circuit 10 and the second refrigerant circuit 20 in the outdoor heat exchanger 30, so that the cooling in the first refrigerant circuit 10 is performed. Both the capacity and the heating capacity in the second refrigerant circuit 20 can be increased.

(5) Other Embodiment (5-1) Other Embodiment A
In the above embodiment, the case where R32, which is not a non-azeotropic mixed refrigerant, is used in the first refrigerant circuit 10 and the second refrigerant circuit 20 has been described as an example.

On the other hand, in each of the first refrigerant circuit 10 and the second refrigerant circuit 20, the non-azeotropic mixed refrigerant, which is a refrigerant classified as slightly flammable (A2L) by ISO817, has a filling refrigerant amount of less than 1.84 kg. It may be used. Examples of the non-azeotropic mixed refrigerant include R454A, R454B, and R454C.

(5-2) Other Embodiment B
In the above-described embodiment, the first gas side closing valve 18a to which the first gas side refrigerant connecting pipe 66 belonging to the first refrigerant circuit 10 is connected and the third gas side refrigerant connecting pipe 86 belonging to the second refrigerant circuit 20 are connected. The third gas side closing valve 28a, the second gas side closing valve 18b to which the second gas side refrigerant connecting pipe 76 belonging to the first refrigerant circuit 10 is connected, and the fourth gas side refrigerant connecting belonging to the second refrigerant circuit 20. The case where the fourth gas side closing valve 28b to which the pipe 96 is connected is arranged in order from the bottom has been described as an example.

On the other hand, for example, as shown in FIG. 5, the first gas side closing valve 18a to which the first gas side refrigerant connecting pipe 66 belonging to the first refrigerant circuit 10 is connected, and the third belonging to the second refrigerant circuit 20. The third gas side closing valve 28a to which the gas side refrigerant connecting pipe 86 is connected, the fourth gas side closing valve 28b to which the fourth gas side refrigerant connecting pipe 96 belonging to the second refrigerant circuit 20 is connected, and the first refrigerant circuit 10 The second gas side closing valve 18b to which the second gas side refrigerant connecting pipe 76 belonging to the above is connected may be arranged in order from the bottom. Here, the first gas side closing valve 18a, the third gas side closing valve 28a, the fourth gas side closing valve 28b, and the second gas side closing valve 18b are attached to the closing valve support plate 42, which is one sheet metal. It may be fixed.

In this case, for example, there is a case where the cooling operation is performed in the first refrigerant circuit 10 and the heating operation is performed in the second refrigerant circuit 20 at the same time, or the heating operation is performed in the first refrigerant circuit 10 and at the same time in the second refrigerant circuit 20. In the case of performing the cooling operation, the air or the closing valve support plate 42 between the first gas side closing valve 18a, the third gas side closing valve 28a, the fourth gas side closing valve 28b, and the second gas side closing valve 18b is used. It is possible to suppress the transfer of heat through the air and increase the efficiency.

For example, a case where the cooling operation is performed in the first refrigerant circuit 10 and the heating operation is performed in the second refrigerant circuit 20 will be described. First, the temperature of the second gas side closing valve 18b is lowered by the refrigerant whose temperature has dropped due to evaporation in the indoor heat exchanger 71. Then, the temperatures of the third gas side closing valve 28a and the fourth gas side closing valve 28b are raised by the high temperature refrigerant discharged from the second compressor 21. Then, the second gas side closing valve 18b having a low temperature is not arranged at a position sandwiched between the third gas side closing valve 28a having a high temperature and the fourth gas side closing valve 28b having a high temperature, but has a temperature. It is arranged far upward from the high third gas side closing valve 28a and close to only the high temperature fourth gas side closing valve 28b. Therefore, it is possible to prevent the second gas side closing valve 18b having a low temperature from adversely affecting the temperature of both the third gas side closing valve 28a and the fourth gas side closing valve 28b. , The influence of the second gas side closing valve 18b having a low temperature can be limited to the third gas side closing valve 28a only. As a result, the refrigerant discharged from the second compressor 21 during the heating operation can be delivered to the third chamber heat exchanger 81 while maintaining a high temperature.

(5-3) Other Embodiment C
In the air conditioner 1 of the above-described embodiment, two refrigerant circuits independent of each other are provided, and a case where two indoor units are connected in each refrigerant circuit has been described as an example.

However, the number of independent refrigerant circuits included in the air conditioner is not limited to two, and may be three or more.

Further, the number of indoor units per refrigerant circuit is not limited to two, and may be one or three or more.

Further, the type of the pipe diameter of the gas-refrigerant connecting pipe included in one refrigerant circuit is not limited to two types, and may be three or more types.

(5-4) Other Embodiment D
The uses of the first chamber unit 6, the second chamber unit 7, the third chamber unit 8, and the fourth chamber unit 9 in the above-described embodiment are not particularly limited to air conditioning applications, and one type. It is not limited to those commonly used for various purposes. For example, it may be used not only for air conditioning, but also for water heaters and floor heating, and may be used as a combination thereof.

Although the embodiments of the present disclosure have been described above, it will be understood that various modifications of the forms and details are possible without departing from the purpose and scope of the present disclosure described in the claims. ..

1 Air conditioner (refrigerant cycle system)
2 Outdoor unit (heat source side unit)
6 1st room unit (user unit)
7 Second room unit (user unit)
8 Third room unit (user unit)
9 4th room unit (user unit)
10 1st refrigerant circuit 20 2nd refrigerant circuit 30 Outdoor heat exchanger (heat source side heat exchanger)
30a Outdoor fan 31 1st heat transfer tube 32 2nd heat transfer tube 33 Heat transfer fin 34 1st gas header 35 2nd gas header 36 1st diversion device 37 2nd diversion device 61 1st indoor heat exchanger 65 1st liquid side refrigerant communication pipe (Liquid refrigerant communication pipe)
66 1st gas side refrigerant communication pipe (gas refrigerant communication pipe)
71 Second chamber heat exchanger 75 Second liquid side refrigerant communication pipe (liquid refrigerant communication pipe)
76 Second gas side refrigerant communication pipe (gas refrigerant communication pipe)
81 3rd chamber heat exchanger 85 3rd liquid side refrigerant communication pipe (liquid refrigerant communication pipe)
86 Third gas side refrigerant communication pipe (gas refrigerant communication pipe)
91 4th room heat exchanger 95 4th liquid side refrigerant communication pipe (liquid refrigerant communication pipe)
96 Fourth gas side refrigerant communication pipe (gas refrigerant communication pipe)

Patent Document 1: Japanese Unexamined Patent Publication No. 2009-174759

Claims (5)

A refrigerant cycle system (1) having a plurality of independent refrigerant circuits (10, 20).
A heat source side unit (2) common to the plurality of refrigerant circuits, and
A plurality of user-side units (6, 7, 8, 9) connected to the heat source-side unit, and
A plurality of gas-refrigerant connecting pipes (66, 76, 86, 96) connecting the heat source side unit and the plurality of utilization side units, and
With
The plurality of gas-refrigerant connecting pipes include two or more types of pipe diameters.
Of the plurality of gas-refrigerant connecting pipes, at least the upper two pipes having a large pipe diameter belong to different refrigerant circuits.
Refrigerant cycle system. Of the plurality of gas-refrigerant connecting pipes, at least the lower two pipes having a smaller pipe diameter belong to different refrigerant circuits.
The refrigerant cycle system according to claim 1. The plurality of the refrigerant circuits include a first refrigerant circuit (10) and a second refrigerant circuit (20).
The first refrigerant circuit has a plurality of the gas refrigerant connecting pipes (66, 76) including two or more kinds of pipe diameters.
The second refrigerant circuit has a plurality of the gas refrigerant connecting pipes (86, 96) including two or more kinds of pipe diameters.
The heat source side unit is
The gas refrigerant communication pipe (76) having the minimum pipe diameter of the first refrigerant circuit is located at a position lower than the closing valve (28b) of the gas refrigerant communication pipe (96) having the minimum pipe diameter of the second refrigerant circuit. The closing valve (18b) of
The gas refrigerant communication pipe (86) having the maximum pipe diameter of the second refrigerant circuit is located at a position lower than the closing valve (18b) of the gas refrigerant communication pipe (76) having the minimum pipe diameter of the first refrigerant circuit. The closing valve (28a) of
The gas refrigerant communication pipe (66) having the maximum pipe diameter of the first refrigerant circuit is located at a position lower than the closing valve (28a) of the gas refrigerant communication pipe (86) having the maximum pipe diameter of the second refrigerant circuit. Closed valve (18a) is located,
The refrigerant cycle system according to claim 1 or 2. The plurality of the refrigerant circuits include a first refrigerant circuit (10) and a second refrigerant circuit (20).
The first refrigerant circuit has a plurality of the gas refrigerant connecting pipes (66, 76) including two or more kinds of pipe diameters.
The second refrigerant circuit has a plurality of the gas refrigerant connecting pipes (86, 96) including two or more kinds of pipe diameters.
The heat source side unit is
The gas refrigerant communication pipe (96) having the minimum pipe diameter of the second refrigerant circuit is located at a position lower than the closing valve (18b) of the gas refrigerant communication pipe (76) having the minimum pipe diameter of the first refrigerant circuit. The closing valve (28b) of
The gas refrigerant communication pipe (86) having the maximum pipe diameter of the second refrigerant circuit is located at a position lower than the closing valve (28b) of the gas refrigerant communication pipe (96) having the minimum pipe diameter of the second refrigerant circuit. The closing valve (28a) of
The gas refrigerant communication pipe (66) having the maximum pipe diameter of the first refrigerant circuit is located at a position lower than the closing valve (28a) of the gas refrigerant communication pipe (86) having the maximum pipe diameter of the second refrigerant circuit. Closed valve (18a) is located,
The refrigerant cycle system according to claim 1 or 2. Each of the plurality of refrigerant circuits has a compressor (11, 21) having the same capacity.
The refrigerant cycle system according to any one of claims 1 to 4.

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