JPH0769097B2 - Air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-chamber heat pump air conditioner in which a plurality of indoor units are connected to one heat source device,
In particular, the present invention relates to an air conditioner capable of selectively performing heating and cooling for each indoor unit, simultaneously performing cooling in one indoor unit and heating in the other indoor unit.

[Prior Art] Conventionally, a heat pump type air conditioner in which a plurality of indoor units are connected to one heat source device by two pipes of a gas pipe and a liquid pipe to perform a cooling and heating operation is common, and each indoor unit is The machines are all configured to heat or cool.

[Problems to be Solved by the Invention] Since the conventional multi-chamber heat pump type air conditioner is configured as described above, all indoor units are operated only for cooling or heating, and therefore, in a place where cooling is required. There is a problem that heating is performed, and conversely, cooling is performed in a place where heating is required.

In particular, when installed in a large-scale building, the air-conditioning load is significantly different between the interior section and the perimeter section, or the general office room and a computer room or other OA room, which is a particular problem.

The present invention has been made to solve the above problems, and a plurality of indoor units are connected to one heat source unit, and heating and cooling are selectively performed for each indoor unit, and one of the indoor units is provided. When installed in a large building so that the indoor unit can perform cooling and the other indoor unit can perform heating at the same time, the interior section and perimeter section, or the general office room and computer room will be converted to OA. It is an object of the present invention to provide a multi-room heat pump type air conditioner capable of coping with different air conditioning loads in different rooms.

[Means for Solving the Problems] An air conditioner according to claim 1 of the present invention is a compressor,
One heat source device including a switching valve and a heat source device side heat exchanger,
A plurality of indoor units each having an indoor heat exchanger,
In those connected via the first and second connection pipes,
A first branch portion that connects 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, and the plurality of indoor units described above. A second branch portion connected to the other of the indoor heat exchangers and connected to the second connection pipe, and a pipe branching from the second connection pipe to reach the first branch portion. A branching pipe branch, a flow rate control device provided in the middle of the pipeline connecting the branching pipe and the other of the indoor heat exchangers to control the flow rate of the refrigerant, and the first branching part. Is provided,
A plurality of first branch ports connected to one of the indoor heat exchangers are provided, and the number of the first branch ports and the number of the indoor units are different from each other. .

An air conditioner according to claim 2 of the present invention comprises
In the description, a bypass pipe, one end of which is connected to the second branch portion, and the other end of which is connected to a connection pipe having a low pressure through a third flow control device, and the third flow control device downstream-side bypass pipe And a heat exchange section for exchanging heat between each indoor unit and the connection pipe connecting the second branch section, and a heat exchange section provided corresponding to this heat exchange section and connected to the other of the indoor heat exchangers. A plurality of second branch openings, and the number of the second branch openings is different from the number of the indoor units.

The air conditioner according to claim 3 of the present invention is the same as that of claim 2.
In the description, the heat exchange part is provided in each of the plurality of connection pipes, and the heat exchange amount of each heat exchange part is substantially the same.

According to a fourth aspect of the present invention, there is provided the air conditioner according to the first aspect.
In the description, according to the capacity of the indoor unit, the first branch port is singly or plurally integrated and connected to the indoor unit, and the second
Is connected to the indoor unit either individually or in combination.

[Operation] The air conditioner according to claim 1 of the present invention is connected to one of the indoor heat exchangers, and the number of a plurality of first branch ports provided in the first branch portion and the number of indoor units. The number of connections of the first branch portion can be changed according to the capacity of the indoor unit when the air conditioner is operating, and the indoor unit having a large capacity can be used even when the capacity of the indoor unit is different. The pressure loss when the refrigerant flowing from the first branch portion to the first branch portion can be suppressed to a low level.

Further, according to claim 2 of the present invention, when the air conditioner is in operation, the second branch port of the second branch part provided corresponding to the heat exchange part according to the capacity of the indoor unit is provided. The number of connections with the indoor unit can be changed, and even when the capacity of the indoor unit is different, the pressure loss when the refrigerant passing through the indoor unit having a large capacity passes through the second branch portion can be suppressed to a low level. The heat exchange section can provide a sufficient degree of supercooling of the refrigerant in the indoor unit having a large capacity to be cooled.

Further, in the air conditioner according to claim 3 of the present invention, the heat exchange capacities of the heat exchange parts respectively provided in the plurality of connection pipes connecting the indoor unit and the second branch part are substantially the same, and By changing the number of connections of the third heat exchanging unit according to the capacity of the air conditioner, the refrigerant passing through the indoor unit having a large capacity does not pass through the third heat exchanging unit even when the capacity of the indoor unit is different during the operation of the air conditioner. The pressure loss when passing through can be kept low.

Further, in the air conditioner according to claim 4 of the present invention, when the air conditioner is operating, the first branch port of the first branch part and the second branch part of the second branch part are operated according to the capacity of the indoor unit. The number of connections to the indoor unit at the branch port can be changed, and even if the capacity of the indoor unit is different, the refrigerant that passes through the indoor unit with a large capacity is the first
The pressure loss of the refrigerant when passing through the branch portion and the second branch portion can be suppressed low.

[Examples] Examples of the present invention will be described below.

FIG. 1 is an overall configuration diagram centering on the refrigerant system of the air conditioner of the first embodiment of the present invention. Also, FIG. 2 and FIG.
Fig. 4 and Fig. 4 show the operation state during the heating and cooling operation in the embodiment of Fig. 1, Fig. 2 is an operation state diagram of only cooling or heating, and Figs. 3 and 4 are simultaneous cooling and heating. Fig. 3 shows the operation of the operation, and Fig. 3 shows the heating main body (when the total capacity of the indoor units trying to perform the heating operation is larger than the total capacity of the indoor units trying to perform the cooling operation), and Fig. 4 shows the cooling main (cooling operation). It is a driving | operation operation | movement state diagram which shows the case where the total capacity of the indoor unit which is going to drive is larger than the total capacity of the indoor unit which is going to carry out 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.

In addition, in this embodiment, a case where two indoor units having different capacities are connected to one heat source unit will be described, but the same applies to a case where two or more indoor units are connected and an indoor unit having the same capacity is connected. Is.

In FIG. 1, (A) is a heat source unit, and (B) and (C) are indoor units that are connected in parallel with each other, as will be described later, but have the same configuration. (C) is larger than the indoor unit (B). As will be described later, (E) is a repeater having a first branch part, a second flow rate adjusting device, a second branch part, a gas-liquid separation device, and first and second heat exchange parts. (1) is a compressor, (2) is a four-way switching valve that is a switching valve that switches the refrigerant flow direction of the heat source device,
(3) is a heat source machine side heat exchanger, (4) is an accumulator, and the heat source machine (A) connected with said apparatus (1)-(3)
Make up. (5) is the indoor heat exchanger of the indoor units (B) and (C), respectively, (6) is the thick first connection pipe connecting the four-way switching valve (2) and the relay (E), (6b) , (6c)
Respectively connect the indoor heat exchanger (5) of the indoor units (B) and (C) to the relay unit (E), and connect the first connection pipe (6).
Corresponding to the indoor unit side first connection pipe, (7) is a second connection thinner than the first connection pipe (6) for connecting the heat source unit side heat exchanger (3) and the relay (E) Piping, (7b), (7
c) connects the indoor heat exchanger (5) and the relay (E) of the indoor units (B) and (C), respectively, and the second connection pipe (7)
Corresponding to the second connection pipe on the indoor unit side, (8) is the first connection pipe (6b), (6c) on the indoor unit side, and the first connection pipe (6) or the second connection pipe A three-way switching valve switchably connected to the (7) side, (10b), (10c), and (10d) are first branch ports corresponding to the three-way switching valve (8), and (9) is an indoor side. A first flow rate adjusting device which is connected in proximity to the heat exchanger (5) and is controlled by a heating degree at the time of cooling on the outlet side of the indoor side heat exchanger (5) and a supercooling degree at the time of heating,
It is connected to the second connection pipes (7b) and (7c) on the indoor unit side. (10) is the first branch port (10b), (10c), (10d)
And a first branch portion (11) composed of a three-way switching valve (8) switchably connected to the first connection pipe (6) or the second connection pipe (7) corresponds to the indoor unit side. A second branch part consisting of the second branch ports (11b), (11c), (11d) and its confluence, and (12) is a pipe branch part provided in the middle of the second connection pipe (7). In the gas-liquid separation device that comprises
The gas phase portion is connected to each first port (8a) of the three-way switching valve (8), and the liquid phase portion is connected to the second branch portion (11). (13) is a second flow rate adjusting device which is connected between the gas-liquid separator (12) and the second branch part (11) and which can be opened and closed, and (14) is the second branch part (11) and the above. A bypass pipe connecting to the first connection pipe (6), (15) a third flow rate adjusting device provided in the middle of the bypass pipe (14), (16)
b), (16c), (16d) are provided in the bypass pipe (14) downstream of the third flow rate adjusting device (15), and each second branch port (11b) in the second branch section (11). , (11c), (11
d) is a third heat exchange part having the same heat exchange capacity for performing heat exchange, and (16a) is the third part of the bypass pipe (14).
Downstream of the flow rate control device (15) and the third heat exchange section (16
b), (16c) and (16d) are provided downstream, and the second branch port (11b) on the side of each indoor unit in the second branch section (11),
A second heat exchange part for exchanging heat with the confluence part of (11c) and (11d), and (19) a downstream of the third flow regulating device (15) of the bypass pipe (14) and a machine liquid separation. A first heat exchange part (17) for exchanging heat between a pipe connecting the device (12) and the second flow rate control device (13), and a second branch part (11) and a first heat exchange part (17). A fourth flow control device (44) which is connected to the connection pipe (6) and which can be opened and closed is provided with an indoor unit (C) having a large capacity by integrating the first branch ports (10c) and (10d). The first integrated section that connects to the first connection pipe (6c) on the indoor unit side to be connected, (4
5) is the second integration that connects the second branch ports (11c) and (11d) to the second connection pipe (7c) on the indoor unit side that connects to the indoor unit (C) with a large capacity Part (32) is a third check valve provided between the heat source unit side heat exchanger (3) and the second connection pipe (7), and is a third check valve from the heat source unit side heat exchanger (3). Refrigerant is allowed to flow only to the second connecting pipe (7). (33) is a fourth provided between the four-way switching valve (2) of the heat source unit (A) and the first connecting pipe (6).
Of the first connection pipe (6) and allows the refrigerant to flow only to the four-way switching valve (2). (34) is a fifth check valve provided between the four-way switching valve (2) of the heat source unit (A) and the second connecting pipe (7), and the four-way switching valve (2)
To allow the refrigerant to flow only to the second connecting pipe (7).
(35) is the heat source side heat exchanger (3) and the first connecting pipe (5
It is a sixth check valve provided between the first and second connection pipes (6) and allows the refrigerant to flow only from the heat source unit side heat exchanger (3). The third check valve (32) to the sixth check valve (35) constitute a connection pipe switching device (40).

(41) is a liquid-drainage pipe having one end connected to the gas-liquid separator (12) and the other end connected to the first connection pipe (6), and (42) is a gas-liquid separator (12) of the liquid-drained pipe (41). And a third flow control device (43) provided between the first connection pipe (6) and the liquid removal pipe (41) downstream of the fifth flow control device (42).
It is a fourth heat exchanging part for exchanging heat between the gas-liquid separator (12) and the pipe connecting the first branch part (10).

(23) is a first temperature detector attached to a pipe connecting the second flow rate control device (13) and the first heat exchange section (19),
(25) is a first pressure detector attached to the same pipe as the first temperature detector (23), and (26) is a second branch part (11).
A second pressure detector attached to the pipe, (52) a third pressure detector attached to a pipe connecting the first connecting pipe (6) and the first branch portion (11), and (51) a liquid The second temperature detector mounted on the outlet side of the fourth heat exchange section (43) on the side of the extraction pipe (41), (53) is the first heat exchange section (19) on the side of the bypass pipe (14). It is the 3rd temperature detector attached to the exit side.

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

First, the case of only the cooling operation will be described with reference to FIG.

That is, as shown by the solid line arrow in FIG.
High-temperature and high-pressure refrigerant gas discharged from the four-way switching valve (2)
Through the heat source side heat exchanger (3) to be condensed, and then the third check valve (32), the second connecting pipe (7), the gas-liquid separation device (12), the third 2 flow control device (13) in order, then through the second branch (11), one through the second branch (11b), the second connection pipe (7b) on the indoor unit side Flow into the machine (B), the other is the second branch port (11c), (1
1d), the second integration section (45), and the second connection pipe (7c) on the indoor unit side, and flows into the indoor unit (C). The refrigerant flowing into each indoor unit (B), (C) is decompressed to a low pressure by the first flow rate control device (9) controlled by the heating degree at the outlet of each indoor heat exchanger (5), and then the room The inside heat exchanger (5) exchanges heat with the indoor air, evaporates and gasifies, and cools the room. Then, the refrigerant in the gas state flows from the indoor unit (B) to the first connection pipe (6b) on the indoor unit side,
Through the branch port (10b) of the indoor unit (C) to the first indoor unit side connection pipe (6c), the first integration section (44), the first branch port (10c), (10d) Through the three-way switching valve (8), the first branch portion (10), the first connecting pipe (6), the fourth check valve (33), the four-way switching valve (2), A circulation cycle is formed in which the compressor (1) is sucked through the accumulator (4) to perform 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. Here, the refrigerant flowing from the indoor unit (C) having a large capacity to the first branch portion (10) is more refrigerant from the indoor unit (B), but the refrigerant flowing from the indoor unit (C) is the first refrigerant. It is divided into two in the integrated part (44) and flows into the three-way switching valve (8) through the first branch ports (10c) and (10d), so the pressure when passing through the three-way switching valve (8). Loss is kept low and the first connecting pipe (6)
Flow into.

At this time, the first connecting pipe (6) is low pressure and the second connecting pipe (7) is high pressure, so that inevitably the third check valve (32), the fourth
The refrigerant flows to the check valve (33).

Also, during this cycle, part of the refrigerant that has passed through the second flow rate control device (13) enters the bypass pipe (14),
Is reduced to a low pressure by the flow rate adjusting device (15) of the second heat exchanger (16b), (16c), (16d) and the second branch port (1
1b), (11c), (11d), the second heat exchange section (16
In a), the second branch opening (11b), (11) of the second branch section (11)
c) and (11d), the heat exchanger exchanges heat with the refrigerant flowing into the second flow rate control device (13) in the first heat exchange section (19), and the evaporated refrigerant is , Enters the first connecting pipe (6), and is sucked into the compressor (1) through the fourth and check valves (33), the four-way switching valve (2) and the accumulator (4). On the other hand, the first, second and third heat exchange parts (1
9), (16a), (16b), (16c), (16d) heat exchange, for example, the refrigerant in the second branch part (11), which has been sufficiently subcooled, is about to be cooled Machine (B),
It flows into (C). Here, the refrigerant flowing into the indoor unit (C) having a large capacity is larger than that in the indoor unit (B), but the refrigerant flowing into the indoor unit (C) is the third heat exchange units (16c) and (16).
After being divided into two parts of d) and cooled to a sufficient degree of supercooling, they are passed through the second branch ports (11c) and (11d),
They merge at the second integration section (45) and flow into the indoor unit (C) through the second connection pipe on the indoor unit side. In addition, since it is divided into two parts and passes through the third heat exchange parts (16c) and (16d), pressure loss at the time of passing is suppressed.

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), and the second connection valve. It passes through the pipe (7), the gas-liquid separation connection device (12), the first branch part (10) and the three-way switching valve (8), one of which is the first branch port (10b), and the one on the indoor air side. It flows into the indoor unit (B) through the first connecting pipe (6b), and the other flows into the second branch port (10c), (10
d), through the first integration section (44) and the first connection pipe (6c) on the indoor unit side, and flows into the indoor unit (C). The refrigerant that has flowed into each of the indoor units (B) and (C) exchanges heat with the indoor air to condense and liquefy, thereby heating the room. Then, the refrigerant in the liquid state passes through the first flow rate control device (9) controlled by the degree of supercooling to the outlet of each indoor heat exchanger (5),
From the indoor unit (B), the second connection pipe (7b) on the indoor unit side,
The second connection pipe 7c on the indoor unit side from the indoor unit (C) via the second branch port (11b), the second integrated section (45), the second
After passing through the branch openings (11c) and (11d) of the second branch section (11)
Flow into and merge with each other, and further pass through the fourth flow rate control device (17), where either the first flow rate control device (9) or the fourth flow rate control device (17) has a low pressure two-phase The pressure is reduced to the state. Then, the refrigerant decompressed to a low pressure flows into the sixth check valve (35) and the heat source side heat exchanger (3) through the first connecting pipe (6), exchanges heat and evaporates gas. The refrigerant in the state forms a circulation cycle in which it is sucked into the compressor (1) through the four-way switching valve (2) and the accumulator (4),
Perform heating operation. At this time, the three-way switching valve (8) has a closed second opening (8b), a first opening (8a), and a third opening (8b).
c) is open circuit. Here, the refrigerant flowing from the first branch portion (10) into the indoor unit (C) having a large capacity is larger than the refrigerant flowing into the indoor unit (B), but two refrigerant flowing into the indoor unit (C). The three-way selector valve (8)
Since they merge at the first integration section (44) via the branch ports (10c) and (10d) of the, the pressure loss when passing through the three-way switching valve (8) is suppressed to a low level, and flows into the indoor unit (C). To do. Further, the refrigerant flowing from the indoor unit (C) having a large capacity to the second branch section (11) is larger than the refrigerant flowing from the indoor unit (B), but the refrigerant flowing from the indoor unit (C) is the second refrigerant. It is divided into two parts in the integration part (45) and flows into the third heat exchange parts (16c) and (16d) through the second branch ports (11c) and (11d), so that the third heat exchange part is formed. The pressure loss when passing through the parts (16c) and (16d) is suppressed to a low level and flows into the second branch part (11). At this time, the first connecting pipe (6) is low pressure and the second connecting pipe (7) is high pressure, so that the fifth check valve (34) and the sixth check valve (35) are inevitable.
The refrigerant circulates.

The case of mainly heating in the simultaneous heating and cooling operation will be described with reference to FIG. Here, a case where the indoor unit (C) is about to heat and the indoor unit (B) is about to cool will be described.

That is, as shown by a dotted arrow in FIG. 3, the compressor (1)
High-temperature and high-pressure refrigerant gas discharged from the four-way switching valve (2)
Through the fifth check valve (34), the second connecting pipe (7), the relay device (E), the gas-liquid separator (12), and the first branch ( 10), three-way switching valve (8) connected to the indoor unit (C), first branch port (10c), (10
The refrigerant that has flowed into the indoor unit (C) that is going to be heated through the d), the first integrated unit (44), and the first connection pipe (6c) on the indoor unit side is the indoor heat exchanger (5). Heats the room by exchanging heat with the room air to condense and liquefy. The refrigerant in the liquid state is controlled at the outlet of the indoor heat exchanger (5) by the degree of subcooling, passes through the first flow rate adjusting device (9) in the almost previous state, and is slightly decompressed to a high pressure. It becomes a low intermediate pressure (intermediate pressure), and the second connection pipe (7c) on the indoor unit side to the second integrated section (45), the second branch port (11C), (11d)
And flows into the second branch (11). And the second
Of the indoor heat exchanger (5) is controlled by the superheat at the outlet of the indoor heat exchanger (5) through the branch port (11b) and the second connection pipe (7b) on the indoor unit side into the indoor unit (B) that is going to be cooled. Out 1
After being decompressed by the flow rate control device (9), it enters the indoor heat exchanger (5), exchanges heat and evaporates to become a gas state to cool the room, and the three-way switching valve connected to the indoor unit (B). It flows into the first connecting pipe (6) via (8).

On the other hand, other refrigerants can be opened / closed so that the difference between the high pressure in the second branch portion (11) and the second connection pipe (7) and the intermediate pressure in the second branch portion (11) is kept constant. Through the fourth flow rate control device (17), merges with the refrigerant that has passed through the indoor unit (D) to be cooled, flows into the thick first connection pipe (6), and then the sixth check valve. (35) The heat source unit side heat exchanger (3) flows into the heat source unit to exchange heat and evaporate into a gas state. The refrigerant forms a circulation cycle in which it is sucked into the compressor (1) through the four-way switching valve (2) and the accumulator (4), and performs heating-main operation. At this time, the indoor unit (B) 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) becomes small due to switching to the thick first connecting pipe (6). At this time, the three-way selector valve (8) connected to the indoor unit (C) is
The mouth (8b) is closed, and the first mouth (8a) and the third mouth (8c) are open. The three-way switching valve (8) connected to the indoor unit (B) has the second port (8b) and the third port (8c) open, and the first port (8a) closed. Here, the refrigerant flowing into the indoor unit (C) having a large capacity from the first branch portion (10) is larger than the refrigerant flowing from the indoor unit (B), but the refrigerant flowing into the indoor unit (C) is two. Since it separates and passes through the three-way switching valve (8), and then merges at the first integration section (44) via the first branch ports (10c) and (10d), the pressure loss when passing through the three-way switching valve (8). Is kept low and flows into the indoor unit (C).

At this time, the first connection pipe (6) is low pressure and the second connection pipe (7) is high pressure, so that the fifth check valve (34) and the sixth
The refrigerant flows into the check valve (35).

Further, during this cycle, a part of the liquid refrigerant enters the bypass pipe (14) from the confluence of the second branch ports (11b), (11c), (11d), and the third flow rate adjusting device (15). ) Is reduced to a low pressure by the second heat exchanger (16a) and the second branch (1
Inflow to the second flow rate adjusting device (13) at the first heat exchange section (19) between the second branch ports (11b), (11c), and (11d) confluence section of 1). The refrigerant that has performed a heat exchanger with the refrigerant that has evaporated enters the first connection pipe (6), passes through the sixth check valve (35), and flows into the heat source side heat exchanger (3). Then, it exchanges heat and evaporates to become a gas state. Then, this refrigerant is sucked into the compressor (1) through the four-way switching valve (2) and the accumulator (4). On the other hand, the second branch portion (1) having a sufficient degree of subcooling by being heat-exchanged and cooled by the first, second and third heat exchange portions (19), (16a), (16c) and (16d) ( The refrigerant of 11) flows into the indoor unit (B) that is about to be cooled. Here, the refrigerant flowing into the second branch portion (11) from the indoor unit (C) having a large capacity is larger than the refrigerant flowing to the indoor unit (B), but the refrigerant flowing from the indoor unit (C) to the second branch portion (11). The refrigerant flowing into () is divided into two in the second integration section (45), passes through the second branch ports (11c), (11d), and then flows through the third heat exchange section (16c), ( After being cooled in each of 16d) and having a sufficient degree of supercooling, it flows into the second branch portion (11). Further, the pressure loss at the time of passing through the third heat exchange portions (16c) and (16d), which is divided into two, can be suppressed.

A case of mainly cooling in the cooling / heating simultaneous operation will be described with reference to FIG. Here, the case where the indoor unit (C) is about to cool and the indoor unit (B) is about to heat will be described. 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 exchanges an arbitrary amount of heat in the heat source side heat exchanger (3). To become a two-phase high-temperature high-pressure gas, the third check valve (32),
It is sent from the second connecting pipe (7) to the gas-liquid separator (12) of the relay (E). Here, the gaseous refrigerant and the liquid refrigerant are separated, and the separated gaseous refrigerant is supplied to the first branch (1
0), the three-way switching valve (8), the first branch port (10b), the first connection pipe (6b) on the indoor unit side in this order, flow into the indoor unit (B) to be heated, and then the indoor side The heat exchanger (5) exchanges heat with the room air to condense and liquefy it and heat the room. Furthermore, the outlet of the indoor heat exchanger (5) is controlled by the degree of subcooling and is slightly decompressed through the first flow rate adjusting device (9) which is in a substantially fully opened state, and an intermediate pressure between high pressure and low pressure (intermediate pressure). And flows into the second branch (11). On the other hand, the remaining liquid refrigerant passes through the second flow rate adjusting device (13) which is controlled so that the difference between the high pressure and the intermediate pressure becomes constant, and then the second branch portion (11).
And joins the refrigerant having passed through the indoor unit (B) that is about to be heated. Then, the second branch part (11), the second branch ports (11c), (11d), the second integration part (45), and the second connection pipe (7c) on the indoor unit side pass through the indoor unit. It flows into (C). Then, this refrigerant is decompressed to a low pressure by the first flow rate adjusting device (9) controlled by the superheat degree of the outlet of the indoor heat exchanger (5) of the indoor unit C), and the indoor heat exchanger (5). ) Heat-exchanges with the room air to evaporate and gasify to cool the room. Then, the refrigerant in the gas state passes through the first connection pipe (6c) on the indoor unit side, the first integration section (44), the first branch ports (10c), (10d), and then the indoor unit. Three-way switching valve (8) connected to (C), first branch part (10), first
A circulation cycle in which the compressor (1) is drawn through the connecting pipe (6), the fourth check valve (33), the four-way switching valve (2), and the accumulator (4) to perform the cooling main operation .
At this time, the three-way switching valve (8) connected to the indoor unit (C) has a closed first opening (8a), a second opening (8b), and a third opening (8b).
Mouth (8c) is open. Also, the three-way switching valve (8) connected to the indoor unit (B) has a first port (8a) and FIG. 3 (8c).
Is open and the second port (8b) is closed. Here, the refrigerant flowing from the large capacity indoor unit (C) into the first branch portion (10) is larger than the refrigerant flowing into the indoor unit (B), but the refrigerant flowing from the indoor unit (C) is the first refrigerant. It is divided into two parts in the integrated part (44) and flows into the three-way switching valve (8) via the first branch ports (10c) and (10d), so the pressure loss when passing through the three-way switching valve (8). Is kept low and flows into the first connecting pipe (6).

At this time, the first connecting pipe (6) is low pressure and the second connecting pipe (7) is high pressure, so that inevitably the third check valve (32), the fourth
The refrigerant flows to the check valve (33).

In addition, during this cycle, a part of the liquid refrigerant enters the bypass pipe (14) from the confluence of the second connection pipes (7b), (7c), (7d) of each indoor unit, and adjusts the third flow rate. The pressure is reduced to a low pressure by the device (15) and each second branch portion (11b), (11c), (11d) of the second branch portion (11) is reduced by the second heat exchange portion (16a).
The refrigerant that has undergone heat exchange with the confluence part of the first heat exchange part (19) and the refrigerant flowing into the second flow rate control device and has evaporated is the first connection pipe (6). And enters the compressor (1) through the fourth check valve (33), the four-way switching valve (2) and the accumulator (4). On the other hand, the first, second and third heat exchanger parts (19), (16a), (16b), (16
The refrigerant in the second branch portion (11) that has been heat-exchanged in c) and (16d) and has been cooled and has a sufficient degree of supercooling flows into the indoor unit (C) that is about to be cooled. Here, the refrigerant flowing into the indoor unit (C) having a large capacity is the third heat exchange section (16
c) and (16d), each of which is cooled and fully subcooled, and then passed through the second branch ports (11c) and (11d) and then to the second integration section (45). Merge, the second on the indoor unit side
Flows into the indoor unit (C) through the connection pipe of. Also, 2
Since it passes through the third heat exchange parts (16c) and (16d) in part, the pressure loss during the passage can be suppressed.

In the above embodiment, the three-way switching valve (8) is provided to provide the first connection pipes (6b) and (6c) on the indoor unit side with the first connection pipe (6) or the second connection pipe (7). ) Is switchably connected. However, as shown in FIG. 5, two solenoid on-off valves (30), (31) and other on-off valves may be provided to switchably connect as described above. The effect is obtained.

[Effects of the Invention] As described above, the air conditioner according to claim 1 of the present invention includes a compressor, a switching valve, a heat source side heat exchanger, and the like.
Heat source units and a plurality of indoor units each having an indoor heat exchanger are connected via first and second connection pipes, the indoor heat exchange of the plurality of indoor units A first branch portion that connects one of the units to the first connection pipe or the second connection pipe in a switchable manner, and the other of the indoor heat exchangers of the plurality of indoor units, and A second branch part connected to the second connection pipe; a pipe branch part branching from the second connection pipe to a pipe reaching the first branch part; and the pipe branch part. Provided in the middle of the pipeline connecting the other of the indoor heat exchangers,
A flow rate control device for controlling the flow rate of the refrigerant, and a plurality of first branch ports provided in the first branch section and connected to one of the indoor heat exchangers are provided. The number of indoor units is different from that of the indoor units.

Therefore, the number of connections of the first branch portion can be changed according to the capacity of the indoor unit, and even when the capacity of the indoor unit is different, the refrigerant and the first refrigerant flowing from the indoor unit having a large capacity to the first branch portion can be changed. It is possible to suppress the pressure loss when the refrigerant flowing from the branch portion to the indoor unit having a large capacity passes through the first branch portion.

A second aspect of the present invention and an air conditioner according to the first aspect of the present invention are such that one end is connected to the second branch portion, and the other end is connected to a connection pipe having a low pressure via the third flow rate control device. And a heat exchanging section for exchanging heat between the bypass pipe, the bypass pipe downstream of the third flow rate control device, the connection pipe connecting each indoor unit and the second branching unit, and the heat exchange unit. Provided with a plurality of second branch ports connected to the other of the indoor heat exchangers, and arranged so that the number of the second branch ports and the number of indoors are different from each other. Is.

Therefore, it is possible to change the number of connections of the second branch ports provided corresponding to the heat exchange unit according to the capacity of the indoor unit, and even if the capacity of the indoor unit is different, the refrigerant passing through the indoor unit having a large capacity is It is possible to suppress the pressure loss when passing through the second branch portion to a low level, and it is possible to provide a sufficient degree of supercooling of the refrigerant in the indoor unit having a large capacity to be cooled.

According to a third aspect of the present invention, in the air conditioning apparatus according to the second aspect, the heat exchange section is provided in each of a plurality of connection pipes connecting the indoor unit and the second branch section, and each heat exchange section has a heat exchange section. The heat exchange capacities are almost the same.

Therefore, the number of connections of the third heat exchange unit can be changed according to the capacity of the indoor unit, and when the refrigerant passing through the indoor unit having a large capacity passes through the third heat exchange unit even when the capacity of the indoor unit is different. The pressure loss of can be kept low.

According to a fourth aspect of the present invention, in the air conditioner according to the first aspect, the first branch port is connected to the indoor unit independently or in a plurality of ways according to the capacity of the indoor unit, and the second branch is provided. One or more mouths are integrated and connected to the indoor unit.

Therefore, the number of connections of the first branch port and the second branch port can be changed according to the capacity of the indoor unit, and even when the capacity of the indoor unit is different, the refrigerant passing through the indoor unit having a large capacity has the first branch. The pressure loss of the refrigerant when passing through the section and the second branch can be suppressed low.

Therefore, there is an effect that it is possible to provide a system capable of simultaneously performing cooling and heating operations and capable of coping with various indoor units having different capacities.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram centering on the refrigerant system of the air conditioner of the first embodiment of the present invention. FIG. 2 is a diagram showing the operation state of only the cooling or heating of the embodiment shown in FIG. 1, and FIG.
FIG. 4 is a diagram showing the operation state of the heating main body (when the total capacity of the indoor units to be heated is larger than the total capacity of the indoor units to be cooled) of the embodiment shown in FIG.
FIG. 5 is a diagram showing the operation state of the cooling subject (when the total capacity of the indoor units to be cooled is larger than the total capacity of the indoor units to be heated) of the embodiment shown in FIG. 1, 5
The figure is an overall configuration diagram centering on a refrigerant system of an air conditioner according to another embodiment of the present invention. In the figure, (A) is a heat source device, (B) and (C) are indoor units, (E) is a relay device, (1) is a compressor, (2) is a four-way switching valve, and (3) is the heat source device side. Heat exchanger, (4) accumulator, (5) indoor heat exchanger, (6) first connecting pipe, (6b), (6c) first indoor unit connecting pipe,
(7) is the second connecting pipe, (7b) and (7c) are the second connecting pipes on the indoor unit side, (8) is the three-way switching valve, (9) is the first flow control device, and (10). Is the first branch, (10b), (10
c) and (10d) are the first branch openings, (11) are the second branch sections,
(11b), (11c) and (11d) are second branch ports, (12) is a gas-liquid separator (pipe branch part), (13) is a second flow rate controller, (14) is bypass pipe, (15) is a third flow rate adjusting device, (16a), (16b), (16c) and (16d) are second and third heat exchange units, (17) is a fourth flow rate controlling device, and (19). )
Is the first heat exchange section, (23) is the first temperature detector, and (25)
Is a first pressure detector, (27) first supercooling degree calculating means,
(29) is a control means, (32) is a third check valve, (33) is a fourth check valve, (34) is a fifth check valve, and (35) is a sixth check valve. , (40) is a connection pipe switching device, (44) is a first integrated section, and (45) is a second integrated section. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. A first and second connection of a heat source unit including a compressor, a switching valve, a heat source unit side heat exchanger and the like, and a plurality of indoor units each having an indoor side heat exchanger. A first branch part that connects one of the indoor heat exchangers of the plurality of indoor units to the first connection pipe or the second connection pipe in a connected manner via a pipe. A second branch part connected to the other of the indoor heat exchangers of the plurality of indoor units and connected to the second connection pipe; and a second branch part branched from the second connection pipe A flow control device for controlling the flow rate of the refrigerant, which is provided in the middle of a pipe connecting the pipe branch part that branches the pipe reaching the branch part 1 and the other of the indoor heat exchangers. And a plurality of first plurality of first branch units provided in the first branch portion and connected to one of the indoor heat exchangers. A 岐口, air conditioner, characterized in that the first number and the number of the indoor unit of the branch opening is arranged differently. 2. A bypass pipe, one end of which is connected to the second branch portion, and the other end of which is connected to a connection pipe having a low pressure through a third flow control device, and a downstream side of the third flow control device. A heat exchanging portion for exchanging heat between the bypass pipe, each indoor unit and the connecting pipe connecting the second branch portion, and the other of the indoor heat exchangers provided corresponding to the heat exchanging portion. 2. The air conditioner according to claim 1, further comprising a plurality of second branch ports connected to each other, and the second branch ports and the number of the indoor units are different from each other. 3. The heat exchange section is provided in each of a plurality of connection pipes connecting the indoor unit and the second branch section, and the heat exchange capacities of the heat exchange sections are substantially the same. Item 2. The air conditioner according to item 2. 4. Depending on the capacity of the indoor unit, the first branch port is singly or plurally integrated and connected to the indoor unit, and the second branch port is singly or plurally integrated and connected to the indoor unit. The air conditioner according to claim 1, wherein