JPH05172433A - Air conditioning apparatus - Google Patents

Abstract

PURPOSE:To provide an air conditioning apparatus the workability and installing characteristics of which are favorable even if it is installed in a wide range by a method wherein one heat source machine and a plurality of indoor machines are connected to each other through a plurality of relay machines. CONSTITUTION:All six indoor machines are divided into one group of three composing elements and the other group of three composing elements. The composing element 60 comprises indoor machines B, C and D. The composing element 70 comprises of indoor machines F, G and H. A relay machine E stores in it the first branching part 10 and the second branching part 11 corresponding to the composing element 60; the second, third and fourth flow rate control devices 13, 15 and 17; the first and second heat exchanging parts 19, 16a; and the third heat exchanging parts 16b, 16c and 16d and the like. A relay machine I stores in it the first and second branch parts 50 and 51 corresponding to the composing element 70; the fifth and sixth flow rate control devices 55 and 57; and the fourth, fifth and sixth heat exchanging portions 59, 16i, 16f, 16g and 16h and the like. The relay machine I is placed between the indoor machines F, G and H and the heat source machine A and connected in parallel with the specified relay machine E. Since a plurality of relay machines E and I are placed between the heat source machine A, the indoor machines B to D, F to H, it is possible to provide an air conditioning apparatus in which a workability of connecting pipes and superior installing characteristics of the relay machines can be attained.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional example will be described below. FIG. 8 is an overall configuration diagram centering on a refrigerant system of a conventional air conditioner. Further, FIGS. 9, 10 and 11 show operating states during cooling and heating operation in the conventional example of FIG. 8, FIG. 9 is an operating state diagram of only cooling or heating, and FIGS. 10 and 11 are simultaneous cooling and heating. FIG. 10 shows a heating operation (when the total capacity of the indoor units about to perform the heating operation is larger than the total capacity of the indoor units about to perform the cooling operation).
FIG. 11 is an operation state diagram showing cooling mainly (when the total capacity of the indoor units about to perform the cooling operation is larger than the total capacity of the indoor units about to perform the heating operation). In addition, in this conventional example, a case where three indoor units are connected to one heat source device will be described, but the same applies to a case where two or more indoor units are connected.

In FIG. 8, A is a heat source unit, and B, C, and D are indoor units connected in parallel with each other, which will be described later, and have the same structure. As will be described later, E is a repeater incorporating a first branch part, a second flow rate control device, a second branch part, a gas-liquid separation device, and first and second heat exchange parts. Reference numeral 1 is a compressor, 2 is a four-way switching valve that switches the refrigerant flow direction of the heat source device, 3 is a heat source device side heat exchanger, and 4 is an accumulator, which is connected to the above-mentioned devices 1 to 3 and constitutes a heat source device A. 5 is the indoor heat exchanger of the indoor units B, C and D,
6 is a thick first connecting pipe connecting the four-way switching valve 2 and the relay unit E, 6b, 6c and 6d connect the indoor heat exchanger 5 and the relay unit E of the indoor units B, C and D, respectively. The first connection pipe on the indoor unit side corresponding to the connection pipe 6 of No. 1, 7 is the above-mentioned first connection pipe 6 for connecting the heat exchanger 3 on the heat source unit side and the relay unit E
The thinner second connection pipes 7b, 7c, 7d connect the indoor heat exchangers 5 of the indoor units B, C, D and the relay unit E, respectively, and connect the indoor heat exchanger 5 of the indoor units B, C, D with the indoor unit side corresponding to the second connection pipe 7. Second connection pipe, 8 is first connection pipe 6b, 6c, 6d on the indoor unit side
And a three-way switching valve 9 which is switchably connected to the first connection pipe 6 or the second connection pipe 7 side, and 9 are connected close to the indoor heat exchanger 5, and the indoor heat exchanger during cooling. Controlled by the degree of superheat on the outlet side of 5 and the degree of supercooling during heating
The second connection pipes 7b, 7 on the indoor unit side in the flow control device of
c, 7d.

Reference numeral 10 is the first connecting pipes 6b, 6 on the indoor unit side.
c, 6d and a three-way switching valve 8 switchably connected to the first connecting pipe 6 or the second connecting pipe 7
And 11 are the second connection pipes 7b, 7 on the indoor unit side.
c and 7d, and a second branch portion 12 composed of the meeting portion thereof, 12 is a gas-liquid separator provided in the middle of the second connecting pipe 7,
The gas phase portion is connected to each first port 8 a of the three-way switching valve 8, and the liquid phase portion is connected to the second branch portion 11. Reference numeral 13 is a second flow rate control device which is connected between the gas-liquid separation device 12 and the second branch portion 11 and which can be opened and closed, and 14 is a first portion which connects the second branch portion 11 and the first connection pipe 6 to each other. Bypass pipe, 15 is a third flow rate control device provided in the middle of the first bypass pipe 14, 16b, 16c, 16d
Is provided downstream of the third flow rate control device 15 of the first bypass pipe 14, and heat is exchanged with the second connection pipes 7b, 7c, 7d on the indoor unit side of the second branch portion 11, respectively. The third heat exchange unit 16a for performing the above is provided in the first bypass pipe 14 downstream of the third flow rate control device 15 and downstream of the third heat exchange units 16b, 16c, 16d, and the second branch unit. The second connection pipe 7b on the indoor unit side in 11
A second heat exchanging section 19 for exchanging heat with the meeting section of 7c and 7d, 19 is provided downstream of the third flow rate controller 15 of the first bypass pipe 14 and downstream of the second heat exchanging section 16a. A first heat exchanging unit for exchanging heat between a pipe that connects the gas-liquid separating device 12 and the second flow rate control device 13, and 17 denotes a second branching unit 11 and a first connecting pipe 6 An openable and closable fourth flow rate control device, 32 is a third check valve provided between the heat source side heat exchanger 3 and the second connecting pipe 7, The refrigerant is allowed to flow only from the exchanger 3 to the second connecting pipe 7.

Reference numeral 33 is a fourth check valve provided between the four-way switching valve 2 of the heat source unit A and the first connecting pipe 6, and is a first check valve.
The refrigerant is allowed to flow only from the connecting pipe 6 to the four-way switching valve 2. 34 is the four-way switching valve 2 of the heat source unit A and the second connecting pipe 7
Is a fifth check valve provided between the four-way switching valve 2 and the second connection pipe 7. Reference numeral 35 denotes a sixth check valve provided between the heat source side heat exchanger 3 and the first connection pipe 6, and allows the refrigerant to flow only from the first connection pipe 6 to the heat source side heat exchanger 3. To do. The third check valve 32 to the sixth check valve 35 constitute a switching valve 40. 23
Is a first temperature detector attached to a pipe connecting the second flow rate control device 13 and the first heat exchange unit 19, and 25 is a first pressure attached to the same pipe as the first temperature detector 23. A detector, 25 is a second pressure detector attached to the second branch portion 11.

A conventional example having such a configuration will be described. First, the case of only the cooling operation will be described with reference to FIG. That is, the high-temperature high-pressure refrigerant gas discharged from the compressor 1 as shown by the solid line arrow in FIG.
Through the heat source side heat exchanger 3, and after being condensed, the third check valve 32, the second connection pipe 7, the gas-liquid separation device 12, and the second flow rate control device 13 in this order. Street, then second
Branch portion 11, the second connection pipes 7b, 7c on the indoor unit side,
The refrigerant flowing through 7d into each indoor unit B, C, D is controlled by the degree of superheat at the outlet of each indoor heat exchanger 5
The flow rate control device 9 reduces the pressure to a low pressure, and the indoor heat exchanger 5 exchanges heat with the indoor air to evaporate and gasify to cool the room. Then, the refrigerant in this gas state passes through the first connection pipes 6b, 6c, 6d on the indoor unit side, the three-way switching valve 8, the first branch portion 10, and the first connection pipe 6 and the fourth connection pipe.
A circulation cycle in which the check valve 33, the four-way valve switching valve 2, and the accumulator 4 are sucked into the compressor 1 is configured to perform the cooling operation. At this time, in the three-way switching valve 8, the first port 8a is closed and the second port 8b and the third port 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 inevitably flows to the third check valve 32 and the fourth check valve 33. Further, during this cycle, a part of the refrigerant that has passed through the second flow rate control device 13 enters the first bypass pipe 14 and the third flow rate control device 1
The pressure is reduced to a low pressure at 5, and the third heat exchange parts 16b, 16
c and 16d, the second connection pipes 7b and 7c on the indoor unit side,
7d, and the second connection pipes 7b, 7c, 7d on the indoor unit side of the second branch portion 11 in the second heat exchange portion 16a.
The refrigerant that has exchanged heat with the meeting portion of the first heat exchange section 19 and the refrigerant that flows into the second flow rate control device 13 and has evaporated enters the first connection pipe 6. The compressor 1 is passed through the fourth check valve 33, the four-way switching valve 2 and the accumulator 4.
Inhaled into. On the other hand, the second branch portion 1 is heat-exchanged by the first, second, and third heat exchange portions 19, 16a, 16b, 16c, and 16d, and is cooled and sufficiently supercooled.
Refrigerant No. 1 flows into the indoor units B, C, and D that are about to be cooled.

Next, the case of only the heating operation will be described with reference to FIG. That is, as shown by the broken line arrow in FIG. 9, the high-temperature high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, the fifth check valve 34, the second connecting pipe 7,
The refrigerant that has passed through the gas-liquid separation device 12, the first branch portion 10, the three-way switching valve 8, and the first connection pipes 6b, 6c, 6d on the indoor unit side into the indoor units B, C, D , Heat exchange with indoor air to condense and liquefy and heat the room. Then, the refrigerant in the liquid state passes through the first flow rate control device 9 controlled by the supercooling degree at the outlet of each indoor heat exchanger 5, and then the second connection pipes 7b, 7c on the indoor unit side. , 7d flow into the second branch portion 11 and join together, and further the fourth flow rate control device 1
7, where the pressure is reduced to a low-pressure two-phase state by either the first flow control device 9 or the fourth flow control device 17 and the third flow control device 15. Then, the refrigerant decompressed to a low pressure passes through the first connection pipe 6 and flows into the sixth check valve 35 and the heat source unit side heat exchanger 3 to exchange heat and evaporate to become a gas state refrigerant. , A four-way switching valve 2 and an accumulator 4 form a circulation cycle that is sucked into the compressor 1 to perform heating operation. At this time, the second port 8b of the three-way switching valve 8 is closed, and the first port 8a and the third port 8c are open. At this time, the first connecting pipe 6 is low pressure, the second
Due to the high pressure of the connecting pipe 7 of the fifth check valve 34,
The refrigerant flows to the sixth check valve 35.

A case of mainly heating in the cooling / heating simultaneous operation will be described with reference to FIG. Here, indoor units B and C
2 will be described as heating and one indoor unit D will be cooling. That is, as shown by the solid line arrow in FIG. 10, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is supplied to the four-way switching valve 2, the fifth check valve 34, and the second connecting pipe 7.
, Is sent to the repeater E, passes through the gas-liquid separation device 12,
Then, the refrigerant that has flowed through the first branch portion 10, the three-way switching valve 8 connected to the indoor units B and C, and the connection pipes 6b and 6c on the indoor unit side into the indoor units B and C to be heated is: The indoor heat exchanger 5 exchanges heat with indoor air to condense and liquefy, and heats the room. Then, the refrigerant in the liquid state is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5, passes through the first flow rate control device 9 in a substantially fully opened state, and is slightly decompressed to an intermediate pressure between high pressure and low pressure. The pressure (intermediate pressure) is reached, and the second connection pipe 1 from the second connection pipes 7b, 7c on the indoor unit side
Flow into 1. Then, the second connection pipe 7d on the indoor unit side
Enters the indoor unit D, which is going to be cooled, and enters the indoor heat exchanger 5 for heat exchange after being depressurized by the first flow rate control device 9 controlled by the superheat degree of the outlet of the indoor heat exchanger 5. It evaporates to become a gas state, cools the room, and flows into the first connection pipe 6 via the three-way switching valve 8 connected to the indoor unit D.

On the other hand, the other refrigerant passes through the openable / closable fourth flow rate control device 17 which is controlled so that the difference between the high pressure in the second connecting pipe 7 and the intermediate pressure in the second branch portion 11 is kept constant. hand,
It merges with the refrigerant that has passed through the indoor unit D that is going to be cooled, flows into the thick first connecting pipe 6, flows into the sixth check valve 35, and the heat source unit side heat exchanger 3 to exchange heat and evaporate. The refrigerant in a gas state constitutes a circulation cycle in which it is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4, and performs heating-main operation. At this time, the indoor unit D that is about to be cooled
The pressure difference between the evaporating pressure of the indoor heat exchanger 5 and the evaporating pressure of the heat source side heat exchanger 3 is reduced due to switching to the thick first connecting pipe 6. At this time, the second port 8b of each of the three-way switching valves 8 connected to the indoor units B and C is closed, and the first port 8a and the third port 8c are open. The three-way switching valve 8 connected to the indoor unit D has the second port 8b and the third port 8c opened, and the first port 8a closed.

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 flows through the fifth check valve 34 and the sixth check valve 35 as necessary. In addition, during this cycle, some of the liquid refrigerant flows into the second connection pipe 7 on the indoor unit side.
Enter the first bypass pipe 14 from the confluence of b and 7c,
The pressure is reduced to a low pressure by the third flow control device 15, and the third heat exchange units 16b, 16c, 16d are connected to the second connection pipes 7b, 7c, 7d on the side of each indoor unit, and the second connection pipes. In the heat exchange section 16a, between the second branch section 11 and the meeting section of the second connection pipes 7b, 7c, 7d on the indoor unit side, and further in the first heat exchange section 19, the second flow rate control device. The refrigerant that has undergone heat exchange with the refrigerant flowing into 13 and has evaporated is the first connecting pipe 6
And enters the heat source unit side heat exchanger 3 through the sixth check valve 35 to exchange heat and evaporate into a gas state. Then, this refrigerant passes through the four-way switching valve 2 and the accumulator 4 and then passes through the compressor 1
Inhaled into. On the other hand, the second branch portion 11 is heat-exchanged and cooled by the first, second, and third heat exchange portions 19, 16a, 16b, 16c, and 16d to have a sufficient degree of supercooling.
Of the refrigerant flows into the indoor unit D that is about to be cooled.

A case of mainly cooling in the cooling / heating simultaneous operation will be described with reference to FIG. Here, the indoor unit B,
A case will be described in which two units C are cooling and one indoor unit D is about to heat. That is, as shown by the solid arrow in FIG. 11, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2 and exchanges an arbitrary amount of heat with the heat source side heat exchanger 3 to form a gas-liquid two-phase. The high-temperature high-pressure refrigerant is sent to the gas-liquid separation device 12 of the relay machine E through the third check valve 32 and the second connection pipe 7. Here, it is separated into a gaseous refrigerant and a liquid refrigerant, and the separated gaseous refrigerant is passed through the first branch portion 10, the three-way switching valve 8, and the first connection pipe 6d on the indoor unit side in this order.
It flows into the indoor unit D that is going to be heated, and heat-exchanges with the indoor air in the indoor heat exchanger 5 to be condensed and liquefied to heat the room. Further, it is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5 and is slightly decompressed through the first fully open flow rate control device 9, becoming an intermediate pressure between high pressure and low pressure (intermediate pressure). Flows into the branch portion 11. On the other hand, the remaining liquid refrigerant flows into the second branch portion 11 through the second flow rate control device 13 that is controlled so that the difference between the high pressure and the intermediate pressure becomes constant, and the indoor unit D that is about to be heated is It merges with the refrigerant that has passed through.

Then, it passes through the second branch portion 11 and the second connection pipes 7b and 7c on the indoor unit side and flows into the indoor units B and C. Then, this refrigerant is depressurized to a low pressure by the first flow rate control device 9 that is controlled by the superheat degree of the outlet of the indoor heat exchanger 5 in the indoor units B and C, and becomes the indoor air in the indoor heat exchanger 5. It heats and evaporates, is gasified, and cools the room.
Then, the refrigerant in the gas state is the first refrigerant on the indoor unit side.
Connection pipes 6b and 6c, the three-way switching valve 8 connected to the indoor units B and C, the first branch portion 10, the first connection pipe 6, and the fourth
The check valve 33, the four-way switching valve 2, and the accumulator 4 constitute a circulation cycle in which the air is sucked into the compressor 1 to perform the cooling main operation. At this time, the three-way switching valve 8 connected to the indoor units B and C has the first port 8a closed and the second port 8b and the third port 8c open. Further, the three-way switching valve 8 connected to the indoor unit D has the first port 8a and the third port 8c opened.
The second port 8b is closed.

At this time, the first connecting pipe 6 is low pressure,
Due to the high pressure of the connection pipe 7 of the third check valve 32,
The refrigerant flows to the fourth check valve 33. Further, during this cycle, a part of the liquid refrigerant flows from the meeting portion of the second connection pipes 7b, 7c, 7d on the side of each indoor unit to the first bypass pipe 14
And is depressurized to a low pressure by the third flow control device 15, and is connected to the second connection pipes 7b, 7c, 7d on the indoor unit side by the third heat exchange units 16b, 16c, 16d, and In the second heat exchange section 16 a, between the second branch section 11 and the connection section of the second connection pipes 7 b, 7 c, 7 d on the side of each indoor unit, and further in the first heat exchange section 19, the second The refrigerant that has exchanged heat with the refrigerant flowing into the flow rate control device 13 and has evaporated enters the first connection pipe 6 and the fourth check valve 33, the four-way switching valve 2,
It is sucked into the compressor 1 through the accumulator 4. on the other hand,
First, second and third heat exchange parts 19, 16a, 16
The refrigerant in the second branch portion 11 that has been heat-exchanged and cooled in b, 16c, and 16d and has a sufficient degree of subcooling flows into the indoor units B and C that are about to be cooled.

[0015]

In the conventional air conditioner as described above, when a plurality of indoor units are connected to the heat source unit, since the operation is performed via one relay unit, the installation of the indoor units to be connected is performed. If the range is widened, the connecting pipe length from the repeater to the indoor unit becomes long, and therefore the total connecting pipe length becomes long, which causes a problem that workability is deteriorated. Further, even if the number of indoor units to be connected increases, the number of indoor units to be connected is one. Therefore, as the number of indoor units to connect increases, the size of the repeaters becomes larger and the installability of the repeaters deteriorates. There was a problem to do.

The present invention has been made to solve the above problems, and even when a plurality of indoor units are installed and connected in a wide range to one heat source unit,
The purpose is to obtain an air conditioner with good workability of connecting pipes and installability of a repeater.

[0017]

An air conditioner according to the present invention comprises a heat source unit including a compressor, a four-way switching valve, a heat source unit side heat exchanger, etc., an indoor side heat exchanger, and a first flow rate. In the case where a plurality of indoor units including a control device and the like are connected via first and second connection pipes, the indoor unit is
A unit or a plurality of unit units composed of a plurality of units, and one of the indoor side heat exchangers of the indoor unit is switchably connected to the first connection pipe or the second connection pipe for each unit And a second branch formed by connecting the other of the indoor heat exchangers of the indoor unit to the second connection pipe via the first flow rate control device, and a specific structural unit To the first branch via the second flow control device.
And a bypass pipe connected to the first connection pipe via the fourth flow control device and connected to the first connection pipe via the third flow control device. From the first bypass pipe between the third flow control device and the first connection pipe and the second connection pipe to the first bypass pipe
The heat exchange part for exchanging heat with the pipe reaching the flow rate control device is provided, and the second branch part corresponding to the other structural unit is connected to the first connection pipe via the fifth flow control device. A second bypass pipe to be connected is provided, and the second bypass pipe and the second connection pipe are provided between the fifth flow control device and the first connection pipe to reach the first flow control device. A heat exchange unit for exchanging heat with the pipe is provided, and the first, second branch units, second, third, and fourth flow rate control devices corresponding to the specific structural units, and the heat exchange unit. And a specific repeater having a built-in heat exchanger, and another repeater having the first and second branch parts, the fifth flow control device corresponding to the other constituent units, and the heat exchange part built therein. It is a thing.

Further, the second corresponding to other structural units
Is connected to the first connection pipe via the sixth flow rate control device, and the sixth flow rate control device is built in the corresponding other repeater.

[0019]

In the air conditioner configured as described above, when a plurality of indoor units are connected to the heat source unit, since the operation is performed via a plurality of repeaters, even if the installation range of the connected indoor units is wide. The piping length from the repeater to the indoor unit can be shortened,
Therefore, the total connecting pipe length is shortened and the workability can be improved. Further, even if the number of indoor units to be connected is increased, since it is connected to a plurality of repeaters, it is not necessary to enlarge the shape of the repeaters, and it is possible to solve the problem that the installability of the repeaters deteriorates. it can.

Further, the second branch portion corresponding to the other constituent units of the indoor unit and the first connecting pipe are connected via the sixth flow rate control device, so that each relay is adapted to the load of the indoor unit. The flow rate can be adjusted independently for each machine, and the control characteristics are improved.

[0021]

【Example】

Example 1. Examples of the present invention will be described below.
FIG. 1 is an overall configuration diagram centering on a refrigerant system of an air conditioner according to an embodiment of the present invention. In addition, FIG. 2, FIG. 3, and FIG.
Shows an operation state during cooling / heating operation in the air conditioner shown in FIG. 1, FIG. 2 shows an operation state diagram of only cooling or heating, and FIGS. 3 and 4 show an operation of cooling / heating simultaneous operation. 3 shows heating mainly (when the total capacity of the indoor units trying to perform heating is larger than the total capacity of the indoor units trying to perform cooling), and FIG. 4 shows cooling mainly (total capacity of the indoor units trying to perform cooling operation is It is a driving | operation operation | movement state diagram which shows (when it is larger than the total capacity of the indoor unit which is going to perform heating operation). FIG. 5 is an overall configuration diagram centering on the refrigerant system of the air conditioner of another embodiment of the present invention. FIG. 6 is an overall configuration diagram centering on the refrigerant system of the air conditioner of another embodiment of the present invention. Furthermore, FIG.
FIG. 3 is an overall configuration diagram centering on a refrigerant system of an air conditioner of another embodiment of the present invention. In this embodiment, one heat source unit is connected to six indoor units and two relay units. However, the same is true when two or more indoor units and two or more relay units are connected. is there.

1 to 5, A to D and 1 to 40 are the same as those in the conventional device. In this embodiment, all 6 indoor units are divided into 3 units and 3 units.
Is a specific structural unit composed of the indoor units B, C and D, 7
Reference numeral 0 is another structural unit including the indoor units F, G, and H. E is a specific repeater, which is the same as the above-mentioned conventional device, and corresponds to the specific structural unit 60, that is, the first branch unit 10, the second branch unit 11, the second flow rate control device 13, and the third flow unit. The flow rate control device 15, the fourth flow rate control device 17, the first heat exchange section 19, the second heat exchange section 16a, the third heat exchange sections 16b, 16c, 16d, etc. are built in.
I is the 1st branch part 50 corresponding to the other structural unit 70, the 2nd branch part 51, the 5th flow control device 55, the 6th flow control device 57, 4th, 5th so that it may mention later. And a sixth heat exchanging section 59, 16i, 16f, 16g, 16h, and the like, which is a relay device that is interposed between the indoor units F, G, and H and the heat source device A, and has a specific relay device E. Are connected in parallel.

6f, 6g, and 6h are indoor units F and
The indoor unit side heat exchangers G and H are connected to the other repeaters I, and the indoor unit side first connecting pipes corresponding to the first connecting pipe 6 are 7f, 7g, and 7h, respectively. , G and H indoor side heat exchangers 5 and other relays I are connected to each other, the indoor unit side second connecting pipes corresponding to the second connecting pipes 7 and 8 are indoor unit side first connecting pipes. The pipes 6f, 6g, 6h and the first connecting pipe 6 or the gas-liquid separation device 12 of the specific relay device E.
A three-way switching valve that is switchably connected to the second connection pipe 7 side via the gas phase part of the, 9 is connected close to the indoor heat exchanger 5, and is an outlet side of the indoor heat exchanger 5 during cooling. Degree of superheat,
During heating, the first flow rate control device is controlled by the degree of supercooling, and is connected to the second connection pipes 7f, 7g, 7h on the indoor unit side.

Reference numeral 50 denotes the first connecting pipes 6f, 6 on the indoor unit side.
g, 6h and the first connection pipe 6 or a specific relay E
Second connecting pipe 7 through the gas phase part of the gas-liquid separator 12 of
A first branch portion consisting of a three-way switching valve 8 switchably connected to the indoor unit side second connection pipes 7f, 7g on the indoor unit side;
The second branch consisting of 7h and its meeting point
The branch portion 51 of the second connecting pipe 7 is connected to the liquid phase portion of the gas-liquid separation device 2 of the specific relay device E and the second flow rate control device 13.
It is connected to the. 54 is the second branch portion 51 and the first
The second bypass pipe connecting the connection pipe 6 of the
The fifth flow rate control device 16f, 16g, 16h provided in the middle of the bypass pipe 54 of the second bypass pipe 5
4 is provided downstream of the fifth flow rate control device 55, and the second connection pipe 7f on the side of each indoor unit in the second branch portion 51,
A sixth heat exchanging section 16i for exchanging heat with 7g and 7h, 16i is downstream of the fifth flow rate control device 55 of the second bypass pipe 54 and the sixth heat exchanging sections 16f, 16g, 1
A fifth heat exchange unit, which is provided downstream of 6h, and which performs heat exchange with the meeting portion of the second connection pipes 7f, 7g, 7h on the side of each indoor unit in the second branch unit 51, 59 is the second The second flow rate control device 13 provided downstream of the fifth flow rate control device 55 of the bypass pipe 54 and in the downstream of the fifth heat exchange unit 16i.
And a second heat exchange section for exchanging heat with the pipe connecting the second branch section 51, 57 is openable and closable connected between the second branch section 51 and the first connecting pipe 6. It is a sixth flow control device.

An embodiment of the present invention thus constructed will be described. First, the case of only the cooling operation will be described with reference to FIG. That is, as shown by the solid line arrow in FIG. 2, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, undergoes heat exchange in the heat source side heat exchanger 3 and is condensed, and then the third Of the check valve 32, the second connection pipe 7, the gas-liquid separation device 12, and the second flow rate control device 13 in this order,
Here, it is divided into the refrigerant flowing into the second branch portion 11 and the refrigerant flowing into the other relays I. The refrigerant that has flowed into the second branch portion 11 is the second connection pipes 7b, 7 on the indoor unit side.
After passing through c and 7d into the indoor units B, C and D, the first flow rate control device 9 controlled by the degree of superheat at the outlet of each indoor heat exchanger 5 reduces the pressure to a low pressure and heats the indoor heat. The exchanger 5 exchanges heat with the indoor air, evaporates and gasifies, and cools the room. Then, the refrigerant in the gas state passes through the first connection pipes 6b, 6c, 6d on the indoor unit side, the three-way switching valve 8, and the first branch portion 10, and passes through the first connection pipe 6 and the fourth connection pipe. The check valve 33, the four-way switching valve 2, and the accumulator 4 constitute a circulation cycle of being sucked into the compressor 1 to perform a cooling operation. At this time, in the three-way switching valve 8, the first port 8a is closed and the second port 8b and the third port 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 inevitably flows to the third check valve 32 and the fourth check valve 33. Further, during this cycle, a part of the refrigerant that has passed through the second flow rate control device 13 enters the first bypass pipe 14 and the third flow rate control device 1
The pressure is reduced to a low pressure at 5, and the third heat exchange parts 16b, 16
c and 16d, the second connection pipes 7b and 7c on the indoor unit side,
7d, the second branch portion 1 in the second heat exchange portion 16a.
Heat between the second connection pipes 7b, 7c, 7d on the side of each indoor unit and the refrigerant flowing into the second flow rate control device 13 at the first heat exchange unit 19. The refrigerant that has been exchanged and evaporated enters the first connection pipe 6 and the fourth check valve 3
3, the four-way switching valve 2, and the accumulator 4 are sucked into the compressor 1. On the other hand, the first, second and third heat exchangers 1
The second branch portion 11 is heat-exchanged at 9, 16a, 16b, 16c, 16d and cooled to have a sufficient degree of supercooling.
Refrigerant flows into the indoor units B, C, and D that are about to be cooled.

On the other hand, the refrigerant that has flowed into the other repeater I is connected to the second branch portion 51 and the second connection pipe 7 on the indoor unit side.
f, 7g, 7h, and flow into each indoor unit F, G, H,
The first flow rate control device 9 controlled by the degree of superheat at the outlet of each indoor heat exchanger 5 reduces the pressure to a low pressure, heat-exchanges with the indoor air in the indoor heat exchanger 5, evaporates and gasifies the interior of the room. To cool. Then, the refrigerant in the gas state passes through the first connection pipes 6f, 6g, 6h on the indoor unit side, the three-way switching valve 8, the third branch portion 50, and then the first connection pipe 6 and the fourth connection pipe 4
The check valve 33, the four-way switching valve 2, and the accumulator 4 constitute a circulation cycle that is sucked into the compressor 1 to perform the cooling operation. At this time, the three-way switching valve 8 has the respective first port 8
A is closed, and the second port 8b and the third port 8c are open.

Further, during this cycle, a part of the refrigerant flowing from the second flow rate control device 13 into the other repeater I enters the second bypass pipe 54, and the fifth flow rate control device 5
The pressure is reduced to a low pressure at 5, and the sixth heat exchange units 16f, 16
g and 16h, the second connection pipes 7f and 7g on the side of each indoor unit,
The second connecting pipes 7f, 7 on the indoor unit side of the second branch section 51 in the fifth heat exchanging section 16i.
The refrigerant that has exchanged heat with the meeting portion of g and 7h and further with the refrigerant that flows into the second branch portion 51 in the fourth heat exchange portion 59 is evaporated to the first connection pipe 6. It enters and is sucked into the compressor 1 via the fourth check valve 33, the four-way switching valve 2 and the accumulator 4. On the other hand, heat is exchanged at the fourth, fifth and sixth heat exchange parts 59, 16i, 16f, 16g and 16h,
The refrigerant in the second branch portion 51 that has been cooled and has a sufficient degree of supercooling flows into the indoor units F, G, and H that are about to be cooled.

Next, the case of only the heating operation will be described with reference to FIG. That is, as shown by the broken line arrow in FIG. 2, the high-temperature high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, the fifth check valve 34, the second connecting pipe 7, the gas-liquid separation device. The refrigerant flows through the first branch portion 10 and the other relay device I through the first branch portion 12 and the second branch portion 12. The refrigerant that has flowed into the first branch portion 10 passes through the three-way switching valve 8 and the first connection pipes 6b, 6c, and 6d on the indoor unit side, and then flows into the indoor units B, C, and D, and the indoor air and heat Replace it to liquefy and heat the room. Then, the refrigerant in the liquid state passes through the first flow rate control device 9 controlled by the degree of supercooling at the outlet of each indoor heat exchanger 5, and then the second connection pipes 7b, 7c on the indoor unit side. , 7d to second branch 1
1 and merges, and further passes through the fourth flow control device 17, where either the first flow control device 9 or the fourth flow control device 17 and the third flow control device 15 have a low pressure. The pressure is reduced to the two-phase state. Then, the refrigerant decompressed to a low pressure passes through the first connection pipe 6 and the sixth check valve 3
5, the refrigerant that has flowed into the heat exchanger 3 on the heat source side, exchanged heat, evaporated, and turned into a gas state is the four-way switching valve 2 and the accumulator 4.
After that, a circulation cycle of being sucked into the compressor 1 is constituted, and heating operation is performed. At this time, the second port 8b of the three-way switching valve 8 is closed, and the first port 8a and the third port 8c are open. At this time, since the first connecting pipe 6 is low in pressure and the second connecting pipe 7 is high in pressure, the refrigerant inevitably flows through the fifth check valve 34 and the sixth check valve 35.

On the other hand, the refrigerant that has flowed into the other repeater I is divided into the first branch portion 50, the three-way switching valve 8 and the first indoor unit side.
Through the connection pipes 6f, 6g, and 6h of each indoor unit F, G,
It flows into H and exchanges heat with indoor air to condense and liquefy and heat the room. Then, the refrigerant in the liquid state passes through the first flow rate control device 9 controlled by the degree of supercooling at the outlet of each indoor heat exchanger 5, and the second connection pipe 7 on the indoor unit side.
From f, 7g, and 7h, they flow into the second branch portion 51 and merge, and further flow into the sixth flow control device 57 or a specific relay device E and pass through the fourth flow control device 17, where Either one of the first flow rate control device 9 or the fourth flow rate control device 17 and the sixth flow rate control device 57 reduces the pressure to a low-pressure two-phase state. Then, the refrigerant decompressed to a low pressure flows into the sixth check valve 35 and the heat source unit side heat exchanger 3 through the first connecting pipe 6 to exchange heat and evaporate to become a gas state refrigerant. Configures a circulation cycle in which the compressor 1 is sucked through the four-way switching valve 2 and the accumulator 4 to perform heating operation. At this time, the second ports 8b of the three-way switching valves 8 are closed,
The first port 8a and the third port 8c are open.

A case of mainly heating in the simultaneous heating and cooling operation will be described with reference to FIG. Here, the indoor units B, C,
A case where four D and F units are about to heat and two indoor units G and H are about to cool will be described. That is, as shown by the solid line arrow in FIG. 3, the high-temperature high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, the fifth check valve 34, and the second connecting pipe 7, and then the specific relay device. The refrigerant is sent to E, passes through the gas-liquid separation device 12, and is divided into the refrigerant flowing into the first branching portion 10 and the refrigerant flowing into other relays I here. The refrigerant that has flowed into the first branch portion 10 has a three-way switching valve 8 connected to the indoor units B, C, and D, a first connection pipe 6b on the indoor unit side,
6c and 6d are sequentially passed to the indoor units B, C and D which are going to be heated, and the indoor heat exchanger 5 exchanges heat with the indoor air to condense and liquefy, thereby heating the room. Then, the refrigerant in the liquid state is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5, passes through the first flow rate control device 9 in a substantially fully opened state, and is slightly decompressed to an intermediate pressure between high pressure and low pressure. The pressure becomes an intermediate pressure, and the second connection pipes 7b, 7c, 7 on the indoor unit side are provided.
It flows into the 2nd branch part 11 from d. On the other hand, the refrigerant that has flowed into the other repeaters I is the first branch portion 50 and the indoor unit F.
The three-way switching valve 8 connected to the indoor unit and the first connection pipe 6f on the indoor unit side flow in this order into the indoor unit F that is about to be heated, and the indoor heat exchanger 5 exchanges heat with the indoor air to condense liquid. However, the room is heated. Then, the refrigerant in the liquid state is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5, passes through the first flow rate control device 9 in a substantially fully opened state, and is slightly decompressed to an intermediate pressure between high pressure and low pressure. Pressure (intermediate pressure)
The second connection pipe 7f on the indoor unit side flows into the second branch portion 51.

The flow of the refrigerant to the indoor units G and H to be cooled passes from the second branch portion 51 through the second connection pipes 7g and 7h on the indoor unit side to the outlet of the indoor heat exchanger 5. After the pressure is reduced by the first flow rate control device 9 controlled by the degree of superheat, it enters the indoor heat exchanger 5 to exchange heat and evaporate into a gas state to cool the room and connect it to the indoor units G and H. And flows into the first connecting pipe 6 via the three-way switching valve 8.
The flow rate of the refrigerant flowing into the indoor units G and H is determined according to the cooling load of the indoor units G and H that are going to be cooled.
Therefore, when the flow rate of the refrigerant flowing from the second branch portion 51 to the indoor units G and H is higher than the flow rate of the refrigerant flowing from the indoor unit F to the second branch portion 51, the indoor units B, C, and D Part of the refrigerant that has flowed into the branch portion 11 flows into the second branch portion 51, merges with the refrigerant that has flowed into the second branch portion 51 from the indoor unit F, and flows into the indoor units G and H. .. On the other hand, the other refrigerants flowing from the indoor units B, C, and D into the second branch section 11 are the high pressure of the second connection pipe 7 and the intermediate pressure of the second branch section 11 and the second branch section 51. Through the fourth flow rate control device 17 or the sixth flow rate control device 57 that can be opened / closed and is controlled so as to make the difference between them constant, and join the refrigerant that has passed through the indoor units G and H to be cooled. The refrigerant that has flowed into the thick first connection pipe 6 and has flowed into the sixth check valve 35 and the heat exchanger 3 on the heat source unit side to exchange heat and evaporate into a gas state is the four-way switching valve 2 and the accumulator 4. After that, a circulation cycle of being sucked into the compressor 1 is configured, and heating-based operation is performed.

Further, from the second branch portion 51 to the indoor units G, H
If the flow rate of the refrigerant flowing into the indoor unit F is less than the flow rate of the refrigerant flowing into the second branch portion 51 from the indoor unit F,
A part of the refrigerant flowing into the branch portion 51 of the second branch portion 51
To the indoor units G and H. On the other hand, from the indoor unit F to the second
The other refrigerants flowing into the branch portion 51 of the indoor units B, C, D
Together with the refrigerant flowing into the second branch portion 11 from the high pressure of the second connection pipe 7 and the second branch portion 11 and the second branch portion 5.
The fourth flow rate control device 17 or the sixth flow rate control device 5 which can be opened and closed and is controlled so that the difference from the intermediate pressure of 1 is constant.
7, the refrigerant that has passed through the indoor units G and H, which are going to be cooled, merges and flows into the thick first connection pipe 6,
The check valve 35, the heat source side heat exchanger 3, the heat exchanged and evaporated refrigerant, which has become a gas state, is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4 to form a circulation cycle. Then, the heating-based operation is performed.

At this time, the pressure difference between the evaporation pressure of the indoor heat exchanger 5 and the evaporation pressure of the heat source side heat exchanger 3 of the indoor units G and H to be cooled is switched to the thick first connecting pipe 6. Becomes smaller. At this time, the indoor units B, C,
The three-way switching valve 8 connected to D and F has the respective second port 8
b is closed, and the first port 8a and the third port 8c are open. The three-way switching valve 8 connected to the indoor units G and H is the second
The mouth 8b and the third mouth 8c are open, and the first mouth 8a is closed. At this time, since the first connecting pipe 6 is low in pressure and the second connecting pipe 7 is high in pressure, the refrigerant inevitably flows through the fifth check valve 34 and the sixth check valve 35.

Further, during this cycle, some of the liquid refrigerant flows from the meeting portion of the second connecting pipes 7b, 7c, 7d on the indoor unit side to the first bypass pipe 14 or on the indoor unit side. Two
It enters into the second bypass pipe 54 from the meeting portion of the connecting pipes 7f, 7g, and 7h. The refrigerant that has entered the first bypass pipe 14 is decompressed to a low pressure by the third flow control device 15,
In the third heat exchange section 16b, 16c, 16d between the second connection pipes 7b, 7c, 7d on the side of each indoor unit, and in the second heat exchange section 16a, in each room of the second branch section 11. Second on the machine side
Of the refrigerant that has undergone heat exchange with the connecting portions of the connecting pipes 7b, 7c, 7d, and further with the refrigerant flowing into the second flow rate control device 13 in the first heat exchange portion 19, It enters the connecting pipe 6 of No. 1 and passes through the sixth check valve 35, flows into the heat source unit side heat exchanger 3, exchanges heat and is vaporized into a gas state. Then, this refrigerant is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4. In addition, the second bypass pipe 54
The refrigerant that has entered is depressurized to a low pressure by the fifth flow rate control device 55, and is discharged between the second connection pipes 7f, 7g, and 7h on the indoor unit side in the sixth heat exchange units 16f, 16g, and 16h. Further, in the fifth heat exchange unit 16i, between the second connection pipes 7f, 7g, and 7h on the side of each indoor unit of the second branch unit 51, and the fourth heat exchange unit 59. The refrigerant that has exchanged heat with the refrigerant flowing into the second branch portion 51 from the specific relay machine E and has evaporated enters the first connection pipe 6, passes through the sixth check valve 35, and then passes through the heat source unit. It flows into the side heat exchanger 3, exchanges heat and evaporates to become a gas state. Then, this refrigerant is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4. On the other hand, the first and second and third and fourth and fifth and sixth heat exchange parts 19, 16a, 16b, 16c, 16d, 5
The refrigerant that has been heat-exchanged and cooled at 9, 16i, 16f, 16g, and 16h and has a sufficient degree of supercooling flows into the indoor units G and H that are about to be cooled. Further, by providing the fourth and sixth flow rate control devices 17 and 57 in the specific relay device E and the other relay device I, respectively, the load of the indoor units B, C, D, and F connected respectively can be adjusted. Thus, the flow rate can be adjusted independently for each specific relay E and other relay I.

Here, when four indoor units B, C, D, and F are to be heated and two indoor units G and H are to be cooled, that is, all the indoor units to be cooled are connected to the other repeater I. Although the heating main body in the case of being heated was explained, when all the indoor units to be cooled are connected to the specific relay unit E, and when the indoor units to be cooled are connected to the specific and other relay units E and I, respectively. The same effect can be obtained for the heating main body.

The case of mainly cooling in the simultaneous heating and cooling operation will be described with reference to FIG. Here, the indoor unit B,
A case will be described in which four units C, D, and F are cooling, and two indoor units G and H are about to heat. That is, as shown by the solid arrow in FIG. 4, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2 and the heat source side heat exchanger 3
And exchanges an arbitrary amount of heat into a gas-liquid two-phase high-temperature high-pressure refrigerant,
It is sent from the third check valve 32 and the second connecting pipe 7 to the gas-liquid separation device 12 of the specific relay machine E. Here, the gaseous refrigerant and the liquid refrigerant are separated, and the separated gaseous refrigerant is
Through the branch portion 50, the three-way switching valve 8 and the first connection pipes 6g, 6h on the indoor unit side into the indoor units G, H that are about to be heated, and the indoor heat exchanger 5 heats the indoor air and heat. Replace it to liquefy and heat the room. Further, it is controlled by the degree of supercooling at the outlet of the indoor heat exchanger 5 and is slightly decompressed through the first fully open flow rate control device 9, becoming an intermediate pressure between high pressure and low pressure (intermediate pressure). Flows into the branch portion 51 of. On the other hand, the remaining liquid refrigerant flows into the second branch section 11 and the second branch section 51 through the second flow rate control device 13 which is controlled so as to keep the difference between the high pressure and the intermediate pressure constant.

The flow of the refrigerant to the indoor units B, C, D to be cooled is taken from the second branch portion 11 and the second connection pipes 7b, 7c, 7d on the indoor unit side, and the indoor units B, C, D
Flow into. And this refrigerant is controlled by the degree of superheat at the outlet of the indoor heat exchanger 5 of the indoor units B, C, D.
The flow rate control device 9 reduces the pressure to a low pressure, and the indoor heat exchanger 5 exchanges heat with the indoor air to evaporate and gasify to cool the room. The refrigerant in the gas state is supplied to the indoor unit-side first connection pipes 6b, 6c, 6d, the indoor unit B,
The three-way switching valve 8 connected to C and D and the first branch portion 10 flow into the first connecting pipe 6. In addition, the flow of the refrigerant to the indoor unit F, which is about to be cooled, is the second branch portion 5
1, through the second connection pipe 7f on the indoor unit side, and flows into the indoor unit F. Then, this refrigerant is decompressed to a low pressure by the first flow rate control device 9 which is controlled by the superheat degree of the outlet of the indoor heat exchanger 5 of the indoor unit F, and exchanges heat with the indoor air in the indoor heat exchanger 5. Then, the inside of the room is cooled by being vaporized and gasified. Then, the refrigerant in the gas state passes through the first connection pipe 6f on the indoor unit side, the three-way switching valve 8 connected to the indoor unit F, and the first branch portion 50 to pass through the first connection pipe 6 Flow into.
In the first connection pipe 6, the refrigerant from the specific relay device E and the refrigerant from the other relay device I merge, and the fourth reverse valve 33,
A circulation cycle in which the compressor 1 is sucked through the four-way switching valve 2 and the accumulator 4 constitutes a cooling main operation.

Indoor units B, C, D which are about to be cooled
Indoor units B, C, D, and F depending on the cooling load of F.
The cooling flow rate flowing into is determined. Therefore, when the refrigerant flow rate flowing from the indoor units G and H into the second branch section 51 is higher than the refrigerant flow rate flowing into the indoor unit F from the second branch section 51,
A part of the refrigerant flowing from the indoor units G and H to the second branch portion 51 flows into the indoor unit F from the second branch portion 51, and the other refrigerant flows from the second branch portion 51 to the specific relay device. It flows into E, merges with the refrigerant that has passed through the second flow rate control device 13, and flows into the indoor units B, C, and D from the 21st branch section 11. When the flow rate of the refrigerant flowing from the indoor units G and H to the second branch section 51 is smaller than the flow rate of the refrigerant flowing from the second branch section 51 to the indoor unit F, the second flow rate control device 13 is passed. Part of the refrigerant flows into the other repeater I, merges with the refrigerant flowing from the indoor units G and H at the second branch section 51, and flows into the indoor unit F from the second branch section 51. The remaining refrigerant that has passed through the second flow rate control device 13 flows into the indoor units B, C, and D from the second branch section 11.

At this time, the three-way switching valve 8 connected to the indoor units B, C, D and F has the first port 8a closed and the second port
The mouth 8b and the third mouth 8c are opened. The three-way switching valve 8 connected to the indoor units G and H has the first port 8a and the third port 8a.
The mouth 8c is open and the second mouth 8b is closed. At this time, since the first connecting pipe 6 is low pressure and the second connecting pipe 7 is high pressure, the refrigerant inevitably flows to the third check valve 32 and the fourth check valve 33.

During this cycle, a part of the liquid refrigerant flows from the connecting portion of the second connecting pipes 7b, 7c, 7d on the side of each indoor unit to the first bypass pipe 14 or on the side of each indoor unit. Two
It enters into the second bypass pipe 54 from the meeting portion of the connecting pipes 7f, 7g, and 7h. The refrigerant that has entered the first bypass pipe 14 is decompressed to a low pressure by the third flow control device 15,
In the third heat exchange section 16b, 16c, 16d between the second connection pipes 7b, 7c, 7d on the side of each indoor unit, and in the second heat exchange section 16a, in each room of the second branch section 11. Second on the machine side
Of the refrigerant that has undergone heat exchange with the connecting portions of the connecting pipes 7b, 7c, 7d, and further with the refrigerant flowing into the second flow rate control device 13 in the first heat exchange portion 19, It enters the connecting pipe 6 of No. 1 and is sucked into the compressor 1 via the fourth check valve 33, the four-way switching valve 2 and the accumulator 4. Also, the second
The refrigerant that has entered the bypass pipe 54 is depressurized to a low pressure by the fifth flow control device 55, and the sixth heat exchange unit 16f,
The second connection pipes 7f, 7 on the indoor unit side at 16g, 16h
g, 7h, and the second connection pipes 7f, 7g on the indoor unit side of the second branch section 51 in the fifth heat exchange section 16i,
The refrigerant that has undergone heat exchange with the refrigerant that flows into the second branch portion 51 from the specific relay E in the fourth heat exchange portion 59 with the association portion of 7h is the first refrigerant. It enters the connection pipe 6, and is sucked into the compressor 1 via the fourth check valve 33, the four-way switching valve 2 and the accumulator 4. On the other hand, the first and second and third and fourth and fifth and sixth heat exchange parts 19,
16a, 16b, 16c, 16d, 59, 16i, 16
The indoor unit B that is about to cool the refrigerant that has undergone heat exchange at f, 16g, and 16h and is cooled to a sufficient degree of supercooling
It flows into C, D, and F. In this way, the first bypass pipe 14, the third flow control device 15, and the second bypass pipe 5
Since the fourth and fifth flow rate control devices 55 are provided in the specific and other repeaters E and I, respectively, the specific and other types can be specified according to the loads of the indoor units B, C, D, and F that are respectively connected. The degree of supercooling can be adjusted by the third or fifth flow control devices 15 and 55 independently for each of the repeaters E and I.

Here, when four indoor units B, C, D, and F are to be cooled, and two indoor units G and H are to be heated, that is, all the indoor units to be heated are the second repeater I.
The description has been given of the cooling main body when connected to the indoor unit E, but when all the indoor units to be heated are connected to the first relay unit E and the indoor units to be heated are the first and second relay units E. , I are also connected to the cooling main body, the same effect can be obtained.

Example 2. In addition, in the said Example, the 6th flow control apparatus 57 was provided in the other repeater I, and the 2nd branch part 51 and the 1st connection piping 6 were connected, but as shown in FIG. Even if the second branch portion 51 is connected to the first connection pipe 6 via the fourth flow rate control device 17 of the specific relay device E without providing the sixth flow rate control device 57 in the relay device I. The same effect as the above embodiment can be obtained. Further, this can reduce the number of flow rate control devices.

Example 3. And 4. In the first and second embodiments, the three-way switching valve 8 is provided and the first connection pipes 6b, 6c, 6d, 6f, 6g, 6h on the indoor unit side and the first connection pipe 6 or the second connection pipe are provided. 7 is switchably connected, but as shown in FIGS. 6 and 7, two solenoid on-off valves 30, 31 and other on-off valves are provided to switchably connect as described above. The same action and effect can be obtained.

[0045]

The air conditioner according to the present invention includes one heat source device including a compressor, a four-way switching valve, a heat source device side heat exchanger, etc., an indoor side heat exchanger, a first flow rate control device, etc. In which a plurality of indoor units consisting of are connected via first and second connection pipes, the indoor unit is divided into a plurality of constituent units consisting of one or a plurality of units, and each constituent unit is divided into A first branch portion that connects one of the indoor heat exchanger of the indoor unit to the first connection pipe or the second connection pipe in a switchable manner, and the other of the indoor heat exchanger of the indoor unit is the The second which is connected to the second connecting pipe via the first flow control device
And a second branch portion corresponding to a specific structural unit, the second branch portion being connected to the first branch portion via the second flow rate control device, and the first flow rate control device via the fourth flow rate control device. And a bypass pipe connected to the first connection pipe through the third flow control device, and further to the third pipe.
A first bypass pipe between the flow rate control device and the first connection pipe, and a heat exchange section for performing heat exchange between the second connection pipe and the pipe reaching the first flow control device. A second bypass pipe connecting the second branch portion corresponding to the above-mentioned other structural unit corresponding to the above-mentioned specific structural unit to the first connecting pipe via the fifth flow rate control device, and Heat exchange for performing heat exchange between the second bypass pipe and the pipe from the second connection pipe to the first flow control device between the fifth flow control device and the first connection pipe. Section,
A first and a second branching section, a second, a third, and a fourth flow rate control device, and a specific repeater incorporating the heat exchange section,
The first and second branch portions corresponding to other structural units,
Even when a plurality of indoor units are installed in a large number and widely connected to one heat source device by providing the fifth flow rate control device and other repeaters incorporating the heat exchange unit, Since a plurality of relays can be interposed between the heat source unit and the indoor unit, it is possible to obtain an air conditioner with good workability of connection pipes and installability of the relays.

Further, the second branch portion corresponding to the other constituent units of the indoor unit and the first connecting pipe are connected via the sixth flow rate control device, and thus the specification is made according to the load of the connected indoor unit. The flow rate can be adjusted independently for each repeater and other repeaters, and the controllability is improved. In addition, even if a large number of indoor units are installed in a large area with respect to one heat source unit and are connected in a wide range, since multiple relay units can be interposed between the heat source unit and the indoor units, connection pipe construction It is possible to obtain an air-conditioning apparatus having good performance and installability of a repeater.

[Brief description of drawings]

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

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

[Fig. 3] Fig. 3 is a diagram showing the operating state of the heating-based main body of the air-conditioning apparatus shown in Fig. 1.

[Fig. 4] Fig. 4 is a diagram showing the operating state of the cooling device of the air conditioner shown in Fig. 1.

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

FIG. 6 is an overall configuration diagram centering on a refrigerant system of an air conditioner showing another embodiment of the present invention.

FIG. 7 is an overall configuration diagram centering on a refrigerant system of an air conditioner showing another embodiment of the present invention.

FIG. 8 is an overall configuration diagram centering on a refrigerant system of a conventional air conditioner.

9 is a diagram showing the operation state of only the cooling or heating of the air conditioner shown in FIG.

[Fig. 10] Fig. 10 is a diagram showing the operation state of the heating main body of the air-conditioning apparatus shown in Fig. 8.

[Fig. 11] Fig. 11 is a diagram showing the operating state of the cooling device of the air-conditioning apparatus shown in Fig. 8.

[Explanation of symbols]

 A heat source unit B, C, D, F, G, H indoor unit E specific relay unit I other relay unit 1 compressor 2 four-way switching valve 3 heat source unit side heat exchanger 5 indoor side heat exchanger 6 first Connection pipe 7 Second connection pipe 9 First flow control device 10, 50 First branch part 11, 51 Second branch part 13 Second flow control device 14 First bypass pipe 15 Third flow control device Device 16a Second heat exchange part 16b, 16c, 16d Third heat exchange part 16f, 16g, 16h Sixth heat exchange part 16i Fifth heat exchange part 17 Fourth flow rate control device 19 First heat exchange Part 54 Second bypass pipe 55 Fifth flow control device 57 Sixth flow control device 59 Fourth heat exchange part 60 Specific structural unit 70 Other structural unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiko Kasai 6-566 Tehira, Wakayama City Wakayama Works, Mitsubishi Electric Corporation (72) Inventor Junichi Kameyama 6-566 Tehira, Wakayama Mitsubishi Electric Company Co., Ltd. Wakayama Factory

Claims (2)

[Claims] 1. A heat source unit comprising a compressor, a four-way switching valve, a heat source unit side heat exchanger and the like, and a plurality of indoor units comprising an indoor side heat exchanger, a first flow rate control device and the like. , First, second
In which the indoor unit is divided into a plurality of structural units consisting of one or a plurality of units,
A first branching portion that connects one of the indoor heat exchangers of the indoor unit to each of the structural units so as to be switchable to the first connection pipe or the second connection pipe, and the indoor heat exchanger of the indoor unit And a second branch portion formed by connecting the other of the two to the second connecting pipe via the first flow control device, and the second branch portion corresponding to a specific structural unit is provided with the second flow control. Connected to the first branch portion via the device, connected to the first connection pipe via the fourth flow control device, and connected to the first connection pipe via the third flow control device. A first bypass pipe between the third flow control device and the first connection pipe, and a pipe from the second connection pipe to the first flow control device. It is equipped with a heat exchanging section for exchanging heat, and the second branching section corresponding to other constituent units is provided with a fifth flow rate control. A second bypass pipe connected to the first connection pipe via a storage device, and further, a second bypass pipe and the second connection pipe between the fifth flow rate control device and the first connection pipe. From the first to the first flow rate control device, a heat exchanging unit for exchanging heat between the pipe and the first flow control device is provided, and the first and second branching units, the second, third, and fourth units correspond to the specific structural units. Flow control device, a specific repeater having the heat exchange section built-in, and the first and second corresponding to other constituent units.
An air conditioner comprising: a branch part, a fifth flow rate control device, and another repeater having the heat exchange part built therein. 2. A second branch part corresponding to another structural unit is connected to a first connecting pipe via a sixth flow control device, and the sixth flow control device is connected to a corresponding other repeater. The air conditioner according to claim 1, wherein the air conditioner is incorporated in the air conditioner.