JPH046362A - Air-conditioner - Google Patents

Abstract

PURPOSE:To connect two or more indoor units to a heat source apparatus and allow them to individually, selectively perform either heating or cooling operation at the same time by a method wherein a second flow control valve is located between a gas-liquid separator and a second manifold, and a relay apparatus includes a first manifold, the second flow control valve, a fourth flow control valve, the gas-liquid separator and the second manifold and is located between the heat source apparatus and the two or more indoor units. CONSTITUTION:A second manifold 11 is connected to a second connecting pipe 7 via a second flow control valve 13 and also to first connecting pipes 6 via a fourth flow control valve 17. A gas-liquid separator 12 is located on a pipe leading to second branch pipes 7b, 7c and 7d, and the second flow control valve 13 is located between the gas-liquid separator 12 and the second manifold 11. A relay apparatus E includes a first manifold, the second flow control valve 13, the fourth flow control valve 17, the gas-liquid separator 12 and the second manifold 11 and is located between a heat source apparatus A and two or moor indoor units B, C and D.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-room heat pump type air conditioner in which a plurality of indoor units are connected to one heat pump. This is an air conditioner that can perform heating and cooling selectively for each unit, or can simultaneously perform cooling with one indoor unit and heating with the other indoor unit.

[Conventional technology]

Traditionally, heat! A heat pump type air conditioner that connects multiple indoor units with two pipes, a gas pipe and a liquid pipe, and performs cooling and heating operation for a III unit is common, and each indoor unit is used for heating or heating. It is designed to provide cooling.

[Problem to be solved by the invention]

Conventional multi-room heat pump air conditioners are configured as described above, so all indoor units operate only for heating or cooling, so heating may be performed in areas that require cooling, or vice versa. There was a problem where cooling was performed in places that required heating, especially when installed in a large building, in the interior section and part of the verimeter, or in rooms that are OAized such as general offices and computer rooms. This is a particular problem because the air conditioning load varies significantly.

This invention was made to solve the above-mentioned problems, and involves connecting a plurality of indoor units to 111 heat sources, and controlling heating and cooling selectively for each indoor unit or only one of them. The indoor unit can perform cooling and the other indoor unit can perform heating at the same time, and when installed in a large building, it can be used in open-air rooms such as the interior section and part of the Verimeter, or general office and computer room. The purpose of the present invention is to provide a multi-chamber heat pump type air conditioner that can handle different air conditioning loads even if the air conditioning loads vary considerably.

[Means to solve the problem]

The air conditioner according to the present invention connects one heat source device and a plurality of indoor units via first and second connection pipes, and the first connection pipe is connected to the second connection pipe. A switching valve is provided between the first and second connecting pipes of the heat source device, so that the first connecting pipe can be switched to low pressure and the second connecting pipe to high pressure. a first branching section in which one of the indoor heat exchangers of the indoor units is switchably connected to the first connection pipe or the second connection pipe; and the plurality of indoor heat exchangers a second branch section connected to the other side of the second flow rate control device via the first flow rate control device and connected to the second connection pipe via a second flow rate side m device; The second branch part and the first connection pipe are connected via a flow rate control device, and the second branch part and the first connection pipe are further connected via a fourth flow rate control device, wherein a gas-liquid separation is provided in the middle of the second connection pipe. further, the second flow control device is connected between the gas-liquid separation device and the second branch, the first branch, the second flow control device,
A repeater incorporating a fourth flow rate side m device, the gas-liquid separation device, and a second branch part is interposed between the heat source device and the plurality of indoor units. It is.

[Effect]

In this invention, when heating is the main component in simultaneous cooling and heating operation, high-pressure gas refrigerant is supplied to each indoor unit that is heating from the heat source equipment side switching valve, the second connection pipe, the gas-liquid separator, and the first branch. After that, the refrigerant is introduced into the second
A part of the air flows into the indoor unit to be cooled, and then flows from the first branch into the first connecting pipe.

On the other hand, the remaining refrigerant uses the fourth flow rate control device to join with the refrigerant that has passed through the cooling indoor unit, flows into the first connection pipe, and returns to the heat source equipment side switching valve.

In addition, in the case of cooling mainly, the high-pressure gas is exchanged with a heat source device in an arbitrary amount and converted into a two-phase state. The separated gaseous refrigerant is introduced into the indoor unit to be heated through the first branch, performs heating, and flows into the second branch. On the other hand, the remaining liquid refrigerant separated by the gas-liquid separator passes through the second flow rate control device and joins with the refrigerant that has passed through the indoor unit to be heated at the second branch, and each It flows into the indoor unit and performs cooling, and then is guided from the first branch through the first connection pipe to the heat source equipment side switching valve and returns to the compressor.

Furthermore, in the case of only heating operation, the refrigerant is introduced into each indoor unit from the heat source equipment side switching valve through the second connection pipe, the gas-liquid separator, and the first branch, heats it, and then flows from the second branch. It passes through the first connection pipe and returns to the heat source equipment side switching valve.

In the case of only cooling operation, the refrigerant is introduced into each indoor unit from the heat # machine side switching valve through the second connection pipe, the gas-liquid separator, and the second branch, cooled, and transferred to the second branch. From there, it passes through the first connection pipe and returns to the heat source machine side switching valve.

〔Example〕

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 a first embodiment of the present invention. Also, Figures 2 to 4
The figure shows the operating state during cooling/heating operation in the embodiment shown in Fig. 1, Fig. 2 shows the operating state of cooling or heating only, and Figs. 3 and 4 show the operation of simultaneous cooling/heating operation. Figure 3 is an operating state diagram showing heating-dominant operation (when the heating operating capacity is greater than cooling operating capacity), and Figure 4 is an operating state diagram showing cooling-dominant operation (when cooling operating capacity is greater than heating operating capacity). . 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 813 indoor units are connected to one heat source unit, but the same applies to a case where two or more indoor units are connected.

In Figure 1, (A) is heat fil! , (B) , (C
) and (D) are indoor units connected in parallel, each having the same configuration, as will be described later. (E) is a first branch part, a second flow rate control device, a second branch part, a gas-liquid separation device, a heat exchange part, a third flow rate side m device, and a fourth flow rate control device, as described later. A repeater with built-in equipment.

(1) is a compressor, (2) is a four-way 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 is connected to the above equipment +11 to (3). and constitutes a heat source device (A). (5) is the three indoor heat exchangers, (6) is the four-way valve (2) of the heat source device (A) and the repeater (E)
Thick first connection piping, (6b), (6c
) and (6d) are indoor units (B) and (C), respectively.
, (D) indoor heat exchanger (5) and relay 1ii (E)
The first connection pipe (6) on the indoor unit side corresponds to the first connection pipe (6), and the first connection pipe (7) is the heat exchanger (3) on the heat source machine side of the heat # machine (A) and the relay II (E ), a second connecting pipe (7b) that is thinner than the first connecting pipe (6).

(7c) and (7d) are indoor units (11) respectively.
, (C), (+)) indoor heat exchanger f5) and relay I
M ('E) is connected to the second connection pipe on the indoor unit side corresponding to the second connection pipe (7), (8) is the first connection pipe on the indoor unit side (6b), (6c), (6d), a three-way switching valve switchably connected to the first connecting pipe (6) or the second connecting pipe (7), and (9) located close to the indoor heat exchanger (5). Connected indoor heat exchanger (5)
The first flow control device is controlled by the sub-cooling amount during cooling on the outlet side of the super upper-11 and the sub-cooling amount during heating, and the second connection pipes (7b), (7c), (7d) on the indoor unit side are
). Ol is the first connection pipe (6
b) A first branching section consisting of a three-way switching valve (8) switchably connected to , (6c), (6d) and the first connection pipe (6) or the second connection pipe (7); 0υ
are the second connection pipes (7b) and (7c) on the indoor unit side
The second branch part consisting of (7d) and the second connecting pipe (7) is a gas-liquid separator installed in the middle of the second connecting pipe (7), and the gas phase part is separated from three sides. The first of the switching valves (8)
0 (8a) connected, and its liquid phase is connected to the second branch αυ
It is connected to the. The pointer is a second flow rate control device that can be opened and closed, which is connected between the gas-liquid separator side and the second branch 0υ, and the α core is connected between the second branch aυ and the first connecting pipe (6).
), α9 is the third flow rate control device installed in the middle of the bypass pipe (16b), (
16c) and (16d) are provided downstream of the third flow rate control device α9 of the bypass pipe, and are connected to the second branch part a1.
The second connection pipe (7b) on the 11 side of each room in 1,
A third heat exchange section (16a) that exchanges heat with the merging sections (7c) and (7d), respectively, is provided downstream of the third flow rate control device QSI of the bypass piping. The second heat exchange part that exchanges heat with the confluence part of the second connection pipes (7b), (7c), and (7d) on each indoor unit side at the branch part αB of No. 2 is the bypass pipe. Piping that connects the gas-liquid separator (2) and the second flow control device α hot water, which are provided downstream of the third flow control device and downstream of the second heat exchange section (16a) of the α ship, A first heat exchange section for exchanging heat between the first heat exchange section and αη is a fourth openable/closeable flow rate control device connected between the second branch section αυ and the first connection pipe (6). (32) is the heat exchanger on the heat source machine side (
3) and the second connection pipe (7), and is a third check valve provided between the heat source equipment side heat exchanger (3) and the second connection pipe (7). Allow refrigerant flow.
(33) is a fourth check valve provided between the four-way valve (2) of the heat source device (A) and the first connection pipe (6); (6) to the above four-way valve (2)
Allow refrigerant flow only to (34) is the heat source 1 above!
It is a fifth check valve provided between the four-way valve (2) of (A) and the second connection pipe (7), and is a fifth check valve provided between the four-way valve (2) of
The refrigerant is allowed to flow only from there to the second connection pipe (7). (35) is a sixth check valve provided between the heat exchanger (3) and the first connection pipe (6); ) is allowed to flow only to the heat source equipment side heat exchanger (3). The third check valve (32) to the sixth check valve (35) are connected to the switching valve (40).
).

An embodiment of the invention configured as described above will now be described.

First, the case of only cooling operation will be explained using FIG.

That is, as shown by the solid arrow in the same figure, the high-temperature, high-pressure refrigerant gas discharged from the compressor (]) passes through the four-way valve (2),
After being condensed and liquefied by heat exchange in the heat exchanger (3) on the heat source side, the third check valve (32), the second connection pipe (7), the gas-liquid separator @, and the second flow rate control device (to), and then the second branch αυ and the second connection pipe (7b) on the indoor unit side.
), (7c), (7d), and each indoor unit (B
), (C) and (D). And 1!1 in each room
The refrigerant flowing into (B), (C), and (D) is reduced to a low pressure by the first flow rate control device (9), which is controlled by the amount of superheat at the outlet of each indoor heat exchanger (5), and then sent indoors. In the inner heat exchanger (5), it exchanges heat with indoor air, evaporates and becomes gas, and cools the room. Then, this refrigerant in a gas state is transferred to the first connection pipe (6b) on the indoor unit side (
6c).

(6d) Three-way switching valve (8), passes through the first branch Q[I, first connecting pipe (6), fourth check valve (33), four-way valve (2) of the heat source device, A circulation cycle is configured in which the air is sucked into the compressor (1) via the accumulator (4), and cooling operation is performed.

At this time, the 10th (8a) of the three-way switching valve (8) is closed, and the 20th (8b) and 30th (8c) are opened.

Also, at this time, the refrigerant is at low pressure in the first connection pipe (6) and in the second connection pipe (6).
Because the connecting pipe (7) is under high pressure, the third check valve (
32), which flows to the fourth check valve (33). Also, during this cycle, a part of the refrigerant that has passed through the second flow control device αj enters the bypass pipe α4) and is transferred to the third flow control device θ.
The pressure is reduced to low pressure at the third heat exchange section (16b),
(16c), (16d) are connected to the second connection pipes (7b), (7c), (7d) on each indoor unit side, and the second heat exchange section (16a) is connected to the second branch section 0υ. The second connection pipe (7b), (7c), on each indoor unit side of
A first heat exchange section 0!1 is further connected to the confluence section (7d).
The evaporated refrigerant undergoes heat exchange with the refrigerant flowing into the second flow rate control device α, and the refrigerant flows through the first connection pipe (6) and the fourth connection pipe (6).
The water enters the check valve (33) of the heat source device, passes through the four-way valve (2) of the heat source device, and the accumulator (4), and is sucked into the compressor (1).

On the other hand, the first, second, and third heat exchange parts 09, (16a) (
16b), (16c), and (16d), the refrigerant in the second branch 0υ, which has been cooled by heat exchange and has been sufficiently subfilled, is sent to the indoor unit (B), which is about to be cooled.
C), flows into (D).

Next, the case of only heating operation will be described using FIG. 2. That is, as shown by the dotted arrow in the figure, the high temperature and high pressure refrigerant gas discharged from the pressure Ii machine +11 is passed through the four-way valve (2
), the fifth check valve (34), and the second connection pipe (7
), passing through the gas-liquid separator@, the first branch α, the three-way switching valve (8), the first connection pipe on the indoor unit side (6b),
Follow (6c), (6d), and 1 in each room! (B
), (C), and (D), exchanges heat with indoor air, condenses and liquefies, and heats the room. This liquid refrigerant then passes through the first flow rate control device (9), which is controlled by the subcooling amount at the outlet of each indoor heat exchanger (5), and the second connection pipe on the indoor unit side. (7b), (7c),
(7d) Flows into the second branch θB, merges with the fourth
It passes through the flow rate control bag fi 01, where the pressure is reduced to a low pressure one-phase state by either the first flow rate control device (9) or the fourth flow rate side m device 071. The refrigerant, which has been reduced in pressure to a low pressure, passes through the first connection pipe (6) to the sixth check valve (35) of the heat source device (A), and then to the heat source device side heat exchanger (
3), it exchanges heat, evaporates, becomes a gas, passes through the four-way valve (2) of the heat source machine, the accumulator (4), and then flows to the compressor (
11 to form a circulation cycle and perform heating operation. At this time, the 20th (8b) of the three-way switching valve (8) is closed, and the 10th (8a) and 30th (8c) are opened.

Also, at this time, the refrigerant is at a low pressure in the first connection pipe (6) and at a high pressure in the second connection pipe (7), so the refrigerant is inevitably passed through the fifth check valve (34) and the sixth check valve (34). 35).

A case in which heating is the main component in simultaneous cooling and heating operation will be described with reference to FIG.

That is, as shown by the dotted arrow in the figure, the high-temperature, high-pressure refrigerant gas discharged from the compressor (1) passes through the four-way valve (2), the fifth check valve (34), and the second connecting pipe. (7) to the repeater (E), passes through the gas-liquid separator ■, and then goes to the first branch Ql, the three-way switching valve (8), and the first connection pipe (6b) on the indoor unit side. 6c) , in this order,
It flows into each of the indoor units (B) and (C) to be heated, exchanges heat with indoor air in the indoor heat exchanger (5), and is condensed and liquefied to heat the room. Then, this condensed and liquefied refrigerant is controlled by the sub-cooling amount at the outlet of each indoor heat exchanger (5), and the first flow rate control device (9) is in a nearly full state.
The air is slightly depressurized and flows into the second branch αυ. Then, a part of this refrigerant is transferred to the second connection pipe on the indoor unit side (
7d) and enters the room III (D) to be cooled, enters the first flow rate control device (9) controlled by the amount of super heat at the outlet of the indoor heat exchanger (5), and is depressurized. The heat in the inner heat exchanger (5) is exchanged and the gas is emitted, which cools the room and activates the three-way switching valve (8).
into the first connecting pipe (6).

On the other hand, the other refrigerant flows to the fourth flow rate side, which can be opened and closed, controlled by the high pressure of the second connection pipe (7) and the intermediate pressure value of the second branch part all. The refrigerant that has passed through the indoor unit (D) to be cooled through the 8 device α force joins with the refrigerant that has passed through the thick first connection pipe (6), and then passes through the sixth check valve (35) of the heat source unit (A). , flows into the heat exchanger (3) on the heat source side, exchanges heat, and becomes a gaseous state. Then, the refrigerant is passed through the four-way valve (2) of the heat source machine.
, constitutes a circulation cycle in which the air is sucked into the compressor (1) via the accumulator (4), and performs heating-based operation. At this time, the indoor heat exchanger (5
The pressure difference between the evaporation pressure of the indoor unit ( The 20th (8b) of the three-way switching valve (8) connected to C) is closed, and the 10th
(8a) and the 30th (8c) are open, the 10th (8a) of the indoor unit CD) is closed, and the 20th (8b) and the 30th (8c) are open.

At this time, since the first connecting pipe (6) has a low pressure and the second connecting pipe (7) has a high pressure, the refrigerant is inevitably passed through the fifth check valve (34).
), which flows to the sixth check valve (35). Also, during this cycle, some of the liquid refrigerant is transferred to the second connection pipes (7b), (7c), (7d) on the indoor unit side of the second branch OD.
) enters the bypass pipe α4) from the confluence part of the third flow rate side '4B. The pressure is reduced to low pressure by the device 0, and the third heat exchange part (16b), (16c), (16d) is connected to the third flow rate side '4B' of each indoor unit. 2 connection pipes (7b), (7c), (7d), and the second branch part QL at the second heat exchange part (16a>).
The second connection pipe (7b) on each indoor unit side of I.

The refrigerant that has been evaporated by heat exchange with the refrigerant flowing from the second flow rate control device α in the first arc exchanger agl is 1 connection pipe (6), and the sixth check valve (35) of the heat source device (A).
), the heat flows into the heat exchanger (3) on the machine side, exchanges heat, and evaporates into a gas state. Then, the refrigerant passes through the four-way valve (2) of the heat source machine and the accumulator (4) and is sucked into the compressor (1).

On the other hand, the first, second, and third heat exchange parts (16a).

(16b), (16c), and (16d), the refrigerant in the second branch O1), which has been cooled by heat exchange and has been sufficiently subcooled, flows into the room Ji1 (which is being cooled).
D).

A case in which cooling is the main component in simultaneous heating and cooling operation will be described with reference to FIG. 4. That is, as shown by the solid arrow in the figure, the high temperature and high pressure refrigerant gas discharged from the compressor (1) is
An arbitrary amount of heat is exchanged in the heat exchanger (3) on the heat source machine side, resulting in a two-phase high temperature and high pressure state, and the third check valve (32), second connection pipe (7), and relay machine (E) are heated. It is sent to the gas-liquid separator surface. And here, it is separated into gaseous refrigerant and liquid refrigerant,
The separated gaseous refrigerant passes through the first branch part α0), the three-way switching valve (8), and the first connection pipe on the indoor unit side (6d), and flows into the indoor unit (D) to be heated. Then, it exchanges heat with indoor air in the indoor heat exchanger (5), condenses and liquefies it, and heats the room.

Furthermore, it is controlled by the subcooling amount at the outlet of the indoor heat exchanger (5), passes through the first flow rate control device (9) which is in an almost fully open state, and is slightly depressurized before flowing into the second branch part αυ. On the other hand, the remaining liquid refrigerant is transferred to the high pressure of the second connection pipe (7).
The refrigerant flows into the second branch part αυ through the second flow rate control device Q3, which can be opened and closed, and is controlled by the intermediate pressure value of the branch part aυ, and joins with the refrigerant that has passed through the indoor unit (D) to be heated. do. Then, it passes through the second branch part on, the second connection pipe (7b) (7c) on the indoor unit side, and each indoor unit (B
), flows into (C). And each room #1 (B)
, (C) is reduced to a low pressure by the first flow control device (9) which is controlled by the amount of superheat at the outlet of the indoor heat exchanger (5), and then transferred to the indoor heat exchanger (5).
), it exchanges heat with indoor air, evaporates and becomes gas, cooling the room. Furthermore, this refrigerant in a gas state is transferred to the first connection pipe (6b) +' (6c) on the indoor unit side.
Pass through the three-way switching valve (8), the first branch part αω, the first connection pipe (6), the fourth check valve (33), the four-way valve (2) of the heat source equipment, and the accumulator (4). A circulation cycle is formed in which the air is sucked into the compressor (1), and air-conditioning is mainly performed. Also, at this time, the 10th (8a) of the three-way switching valve (8) connected to the indoor units (B) and (C) is closed, and the 20th (8b)
) and No. 30 (8c) are open, and the indoor unit (D)
The 20th (8b) is a closed circuit, the 10th (8a), the 30th (8
c) is open circuited.

Also, at this time, the refrigerant is at a low pressure in the first connection pipe (6) and at a high pressure in the second connection pipe (7), so the refrigerant is inevitably passed through the fifth check valve (34) and the sixth check valve (34). 35). Also, during this cycle, some of the liquid refrigerant is transferred to the second connection pipes (7b), (7cL (
7d) enters the bypass pipe 041 from the confluence part of the third flow rate control device α, which is already depressurized to a low pressure and transferred to the third heat exchange part (
16b), (16c), and (16d) to the second connection pipes (7b), (7c), and (7d) on each indoor unit side, and a second branch part in the second heat exchange part (16a). αυ
The second connection piping (7b) (7c) on each indoor unit side of
The refrigerant generated by exchanging heat with the refrigerant flowing into the second flow rate control device a31 at the first rib exchanger α31 is transferred to the confluence part of (7d). It enters the pipe (6) and is sucked into the compressor (1) through the fourth check valve (33) of the heat source machine (A), the four-way valve (2) of the heat source machine, and the accumulator (4). On the other hand, the first, second, and third heat exchange parts aS,
(16a), (16b), (16c), (1
The refrigerant in the second branch part αυ, which has been cooled by heat exchange in step 6d) and has been sufficiently subcooled, flows into the indoor units (B) and (C) which are to be cooled. In addition, in the above embodiment, a three-way switching valve (8) is provided to connect the first connection pipes (6b), (6c), and (6d) on the indoor unit side, and the first connection pipe (6d) on the indoor unit side.
6) Or, it is switchably connected to the second connection pipe (7), but as shown in Fig. 5, two solenoid valves (30
), (31), etc. may be provided and connected in a switchable manner as described above, similar effects can be obtained.

〔Effect of the invention〕

As explained above, the air conditioner of the present invention includes one heat source device including a compressor, a four-way valve, a heat exchanger on the heat source side, an accumulator, etc., an indoor heat exchanger, and a first flow rate control device. A plurality of indoor units consisting of devices, etc. are connected via first and second connection pipes, and the first connection pipe is connected to the second connection pipe.
A switching valve is provided between the first and second connecting pipes of the heat source device, so that the first connecting pipe can be switched to low pressure and the second connecting pipe to high pressure. a first branch part configured by connecting one of the indoor heat exchangers of the plurality of indoor units to the first connection pipe or the second connection pipe in a switchable manner; The other side of the heat exchanger is connected via the second flow rate control device to a second branch section formed by connecting the second connection pipe via the first flow rate control device, and The second branch and the first connection pipe are connected via a fourth flow rate control device, wherein a gas-liquid separator is provided in the middle of the second connection line, and the second flow rate control device is further provided. ? i1! A device is connected between the gas-liquid separation device and the second branch, and includes the first branch, the second flow rate control device, the fourth flow rate control device, the gas-liquid separation device, and the second branch. Since a repeater with a built-in branch part is interposed between the above-mentioned machine and the plurality of indoor units, the heat source machine and the above-mentioned repeater, and the above-mentioned repeater and the above-mentioned plurality of indoor units can be connected. By connecting two connection pipes each, multiple indoor units can be selectively operated in cooling operation or heating operation at the same time. In this case, heating can be performed at the same time, and the thicker end of the extension pipe connecting the heat source equipment and the relay equipment can always be used on the low pressure side, improving capacity, especially when heating and cooling are performed simultaneously. In the case of the subject.

The two-phase high-temperature, high-pressure refrigerant flowing in from the second connection pipe is separated into gaseous refrigerant and liquid refrigerant by the gas-liquid separator.
It is possible to appropriately control only the separated gaseous refrigerant to the heating unit and the remaining liquid refrigerant to the cooling unit, allowing for highly efficient simultaneous heating and cooling operation.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram centered on the 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 cooling or heating only in the embodiment shown in Fig. 1, and Fig. 3 is a diagram showing the operating state of the embodiment shown in Fig. 1 mainly in heating (heating operation capacity is larger than cooling operation capacity). case) operating state diagram,
FIG. 4 is an operating state diagram showing the main cooling operation (when the cooling operation capacity is larger than the heating operation capacity) in one embodiment shown in FIG. 1, and FIG. 5 is an air conditioner according to another embodiment of the present invention. FIG. 2 is an overall configuration diagram centered on the refrigerant system. In the figure, A: heat source unit, B, C, D: indoor units have the same configuration. E: Relay machine, 1: Compressor, 2: 4-way valve of heat source machine, 3: Heat exchanger on heat # machine side, 4: Accumulator, 5: Indoor heat exchanger, 6: First connection pipe, 6b ,
6c, 6d; first connection pipe on the indoor unit side; 7; second connection pipe; 7b, 7c, 7d; second connection pipe on the indoor unit side; 8; three-way switching valve; 9; first flow rate control device, 10
; first branch part, 11; second branch part, 12; gas-liquid separation device, 13; second flow rate control device, 14; bypass piping, 15; third flow rate control device, 16; heat exchange part , 16a
; second heat exchange section, 16b16c, 16d i third heat exchange section, 17; fourth flow rate control device, 18;
, 19; first heat exchange section, 30. 31; on-off valve such as a solenoid valve, 32; third check valve, 33; fourth check valve, 3
4; fifth check valve; 35; sixth check valve; 40; switching valve (four-way valve). In addition, in the figures, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] (1) One heat source device consisting of a compressor, a four-way valve, a heat exchanger on the heat source side, an accumulator, etc., and multiple indoor units consisting of an indoor heat exchanger, a first flow rate control device, etc. , the first
, connected via a second connection pipe, the first connection pipe having a larger diameter than the second connection pipe, and a switching valve provided between the first and second connection pipes of the heat source device. , the first
The connecting pipe can be switched to low pressure and the second connecting pipe to high pressure, and one of the indoor heat exchangers of the plurality of indoor units can be switched to the first connecting pipe or the second connecting pipe. The first branch section is connected to the other of the plurality of indoor heat exchangers via the first flow control device, and the second A second branch part connected to the connection pipe of is connected via the second flow rate control device, and further the second branch part and the first connection pipe are connected to a fourth flow rate control device. A gas-liquid separation device is provided in the middle of the second connection pipe, and the second flow rate control device is further connected between the gas-liquid separation device and the second branch. and a repeater incorporating the first branch, the second flow control device, the fourth flow control device, the gas-liquid separation device, and the second branch,
An air sea bream apparatus capable of simultaneous cooling and heating operation, characterized in that it is interposed between the heat source device and the plurality of indoor units.