JP4747439B2 - Multi-room air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-chamber air conditioner, and more particularly to a configuration in which a bypass path provided with an electromagnetic on-off valve that connects a high-pressure part and a low-pressure part of a refrigerant circuit is provided so that a cooling operation can be performed smoothly.
[0002]
[Prior art]
A conventional multi-room air conditioner includes, for example, a plurality of indoor units 4, 5, and 6, as shown in FIG. Is connected. The discharge side of the compressor 1 is connected to one side of the outdoor heat exchanger 3 by a pipe 13 having an oil separator 11 and a four-way valve 2, and the other side of the outdoor heat exchanger 3 is connected to a pipe 14. Are connected to one side of the indoor side heat exchangers 4a, 5a and 6a provided in the indoor units 4, 5 and 6 via the expansion valve 12, respectively. The piping connected to the other side of the indoor heat exchangers 4a, 5a and 6a is branched by the diversion control units 7, 8 and 9, and one of the branches is connected to the suction side of the compressor 1 by the piping 15, and the other Is connected to the pipe 13 by a pipe 16.
[0003]
In the refrigerant circuit having the above configuration, when both the indoor units 4, 5 and 6 perform the cooling operation, the refrigerant discharged from the compressor 1 passes through the four-way valve 2 as shown by arrows in FIG. It flows into the outdoor heat exchanger 3, releases heat in the outdoor heat exchanger 3, condenses, and then flows into the indoor heat exchangers 4 a, 5 a, and 6 a through the pipe 14. The refrigerant that has absorbed and evaporated the heat in the indoor heat exchangers 4a, 5a, and 6a passes through the piping 15 through the diversion control units 7, 8, and 9, and returns to the suction side of the compressor 1.
[0004]
In recent years, even when the outside air temperature is low in winter, for example, a computer room or the like often performs a cooling operation, and when the cooling operation is performed in a state where the outside air temperature is low, in the above refrigerant circuit, the shunt control units 7 and 8 And the refrigerant 16 stays in the pipe 16 connecting the pipe 13 while condensing, thereby reducing the amount of the refrigerant that performs the cooling operation, and when the refrigerant quantity decreases, the temperature of the refrigerant discharged from the compressor 1 is reduced. Cause the phenomenon of rising. When the temperature of the discharged refrigerant rises, in order to prevent the temperature of the lubricating oil contained therein from rising, a protective function provided in the compressor 1 is activated, and the compressor 1 is stopped or interrupted. It is designed to drive. For this reason, when the cooling operation is performed in a state where the outside air temperature is low, there is a problem that the operation is suddenly stopped or intermittent operation is performed.
[0005]
[Problems to be solved by the invention]
In view of the above problems, the present invention provides a multi-room air conditioner that can smoothly perform a cooling operation even when a cooling operation is performed in a low outside air temperature such as in winter, and can perform a mixture of a cooling operation and a heating operation. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention sequentially connects a discharge side of a compressor, a flow path switching valve, an outdoor heat exchanger, and an expansion valve, while the expansion valve is connected to the suction side of the compressor. A first bypass passage having an electromagnetic on-off valve is provided between the pipe connected to the pipe and the pipe branched from between the discharge side of the compressor and the four-way valve, and connected to the suction side of the compressor A plurality of indoor units provided with an outdoor unit provided with a second bypass passage provided with an electromagnetic on-off valve and an indoor heat exchanger connected to each side of the expansion valve and the pipe. And branching the pipe connected to the other side of the indoor heat exchanger, respectively connecting to one side of the pair of electromagnetic on-off valves, and connecting one of the pipes connected to the other side of the pair of electromagnetic on-off valves. Merge and connect to the pipe connected to the suction side of the compressor, and connect the other pipe to the discharge of the compressor Constitute a refrigerant circuit with a plurality of flow dividing control unit that respectively connected to branched pipe from between said four-way valve,
When both the indoor units are in cooling operation and the temperature of the refrigerant discharged from the compressor reaches a certain set value, the electromagnetic on-off valve provided in the first bypass passage and the second bypass passage are provided. The electromagnetic on-off valve is opened.
[0007]
Further, the flow path switching valve is constituted by a four-way valve.
[0008]
Further, the flow path switching valve is constituted by a pair of electromagnetic on-off valves.
[0009]
Furthermore, it has the structure which each attached the capillary tube to said 1st bypass path and said 2nd bypass path.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.
FIG. 1 (A) is a refrigerant circuit diagram showing a multi-room air conditioner according to a first embodiment of the present invention, and FIG. 1 (B) is a refrigerant circuit diagram showing a second embodiment. 2A is a refrigerant circuit diagram showing the third embodiment, and FIG. 2B is a refrigerant circuit diagram showing the fourth embodiment.
In the first embodiment of the multi-chamber air conditioner according to the present invention, as shown in FIG. 1A, the discharge side of the compressor 1 is chambered by a first pipe 13 having an oil separator 11 and a four-way valve 2. Connected to one side of the outside heat exchanger 3, the other side of the outdoor heat exchanger 3 is connected to the indoor side heat exchanger 4 a of the indoor unit 4 by the second pipe 14 provided with the expansion valve 12, and the indoor side of the indoor unit 5. The heat exchanger 5a and the indoor unit 6 are connected to one side of the indoor heat exchanger 6a. The other side of the indoor heat exchanger 4a reaches a branching control unit 7 having an electromagnetic on-off valve 7a and an electromagnetic on-off valve 7b. The branching control unit 7 branches off, and one of the branches is the electromagnetic on-off valve 7a. The other side is connected to one side of the electromagnetic on-off valve 7b, and the other side of the indoor heat exchanger 5a is connected to a shunt control unit 8 including the electromagnetic on-off valve 8a and the electromagnetic on-off valve 8b. In the same branch flow control unit 8, one branch is connected to one side of the electromagnetic on-off valve 8a and the other side is connected to one side of the electromagnetic on-off valve 8b. The other side leads to a diversion control unit 9 provided with an electromagnetic on-off valve 9a and an electromagnetic on-off valve 9b, branched by the same diversion control unit 9, one of which is branched to one side of the electromagnetic on-off valve 9a, and the other side is Above They are respectively connected to one side of the magnetic-off valve 9b.
[0011]
The piping connected to the other side of the electromagnetic on-off valve 7a, the electromagnetic on-off valve 8a, and the electromagnetic on-off valve 9a merges to form a third piping 15, and is connected to the suction side of the compressor 1 via the accumulator 10. ing. Also, the pipes connected to the other side of the electromagnetic on-off valve 7b, the electromagnetic on-off valve 8b, and the electromagnetic on-off valve 9b merge to form a fourth pipe 16, and the oil separator 11 and the four-way on the first pipe 13 It is connected between the valve 2.
[0012]
Further, a first bypass path 18 having an electromagnetic opening / closing valve 20 is provided between the second pipe 14 and the third pipe 15, and an electromagnetic opening / closing is provided between the fourth pipe 16 and the third pipe 15. Second bypass passages 19 each having a valve 21 are provided.
[0013]
In the second embodiment of the present invention, as shown in FIG. 1B, a capillary tube 22 is provided in the bypass passage 18 and a capillary tube 23 is provided in the bypass passage 19 provided in the refrigerant circuit of the first embodiment described above. Each has a configuration attached. As shown in FIG. 2A, the third embodiment has a configuration in which an electromagnetic opening / closing valve 24a and an electromagnetic opening / closing valve 24b are provided in place of the four-way valve 2 provided in the first embodiment. The fourth embodiment has a configuration in which a capillary tube 22 is attached to the bypass passage 18 of the third embodiment and a capillary tube 23 is attached to the bypass 19, respectively. The refrigerant flow during operation is the same.
[0014]
Next, in the first embodiment described above, the flow of the refrigerant when the indoor unit 4 and the indoor unit 5 perform a cooling operation and the indoor unit 6 performs a heating operation will be described. At this time, the electromagnetic on-off valves 20 and 21 provided on the electromagnetic on-off valves 7b, 8b and 9a and the first bypass passage 18 and the second bypass passage 19 are closed. As shown in FIG. 1A, one of the refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3, releases heat, condenses, passes through the second pipe 14, and It flows into the indoor side heat exchanger 4a and the indoor side heat exchanger 5a, and absorbs heat to evaporate. The evaporated refrigerant passes through the electromagnetic on-off valve 7a and the electromagnetic on-off valve 8a and returns to the suction side of the compressor 1 through the third pipe 15. The other refrigerant discharged from the compressor 1 passes through the fourth pipe 16, flows into the indoor heat exchanger 6a via the electromagnetic on-off valve 9b, and releases heat in the indoor heat exchanger 6a. Condensed. The condensed refrigerant passes through the second pipe 14, joins with the refrigerant sent from the outdoor heat exchanger 3, flows into the indoor heat exchanger 5 a, and is compressed through the third pipe 15. Reflux to the suction side of machine 1.
[0015]
Next, in the second embodiment described above, the refrigerant flow when the indoor unit 4 and the indoor unit 5 perform the heating operation and the indoor unit 6 performs the refrigerant operation will be described. At this time, the electromagnetic on-off valves 7a, 8a and 9b and the electromagnetic on-off valves 20 and 21 provided in the first bypass passage 18 and the second bypass passage 19 are closed, and the four-way valve 2 is switched. As shown in FIG. 1 (B), the refrigerant discharged from the discharge side of the compressor 1 passes through the fourth pipe 16, and passes through the electromagnetic on-off valves 7b and 8b, and the indoor heat exchanger 4a and It flows into the indoor heat exchanger 5a and releases heat to condense. The condensed refrigerant flows into the outdoor heat exchanger 3 through the second pipe 14, absorbs heat, evaporates, and returns to the suction side of the compressor 1 through the four-way valve 2. At this time, the refrigerant condensed in the indoor heat exchanger 5a is divided into the second pipe 14, and the divided refrigerant flows into the indoor heat exchanger 6a and absorbs heat in the indoor heat exchanger 6a. Evaporate. The evaporated refrigerant passes through the electromagnetic on-off valve 9 a and returns to the suction side of the compressor 1 through the third pipe 15.
[0016]
Next, in the third embodiment described above, the flow of the refrigerant when the indoor unit 6 performs the heating operation and the indoor unit 4 performs the cooling operation will be described. At this time, the electromagnetic on-off valves 22a, 22b, 7b, 8a, 8b and 9a are closed, and the expansion valve 12 is also closed. As shown in FIG. 2 (A), the refrigerant discharged from the compressor 1 flows through the fourth pipe 16 into the indoor heat exchanger 6a, releases heat, condenses, It flows into the indoor heat exchanger 4a through the second pipe 14 and absorbs heat to evaporate. The evaporated refrigerant passes through the third pipe 15 and returns to the suction side of the compressor 1.
[0017]
Next, the flow of the refrigerant when the indoor unit 4, the indoor unit 5, and the indoor unit 6 all perform the cooling operation in the fourth embodiment will be described. At this time, the electromagnetic on-off valves 7b, 8b and 9b are closed, and the electromagnetic on-off valve 24b is also closed. The refrigerant discharged from the compressor 1 releases heat in the outdoor heat exchanger 3 and condenses, and the condensed refrigerant passes through the second pipe 14 and the indoor heat exchangers 4a, 5a and 6a. It absorbs heat and evaporates. The evaporated refrigerant returns to the suction side of the compressor 1 through the third pipe 15.
[0018]
During the cooling operation described above, since the refrigerant does not flow through the first pipe 16, the refrigerant stays in the pipe 16, and the amount of refrigerant that performs the cooling operation decreases. When the amount of refrigerant decreases, the temperature of the refrigerant discharged from the compressor 1 rises, and the protection function provided in the compressor 1 is activated. At this time, when the temperature of the refrigerant discharged from the compressor 1 reaches a certain value, the electromagnetic on-off valve 20 and the electromagnetic on-off valve 21 provided in the first bypass passage 18 and the second bypass passage 19 are Opened.
[0019]
When the electromagnetic on-off valve 20 and the electromagnetic on-off valve 21 are opened, the refrigerant sent from the outdoor heat exchanger 3 and the refrigerant staying in the fourth pipe 16 pass through the second pipe 14. Through the compressor 1. As a result, the temperature of the refrigerant discharged from the compressor 1 decreases, and the cooling operation can be continued without stopping the compressor 1.
[0020]
In addition, since the capillary tubes 22 and 23 are attached to the first bypass passage 18 and the second bypass passage 19, the amount of refrigerant flowing back to the compressor 1 through the bypass passages 18 and 19 can be reduced. The operation can be limited to some extent, and the operation can be continued without reducing the efficiency of the cooling operation.
[0021]
【The invention's effect】
As described above, according to the present invention, the first on-off valve provided between the second pipe connecting the outdoor heat exchanger and the indoor unit and the third pipe connecting the indoor unit and the compressor. By providing a second bypass path with an electromagnetic on-off valve between the fourth pipe connecting the discharge side of the compressor and the indoor unit and the third pipe, a low outside air temperature such as in winter Sometimes, even if both indoor units perform cooling operation, a multi-room air conditioner that can perform smooth operation can be obtained.
[Brief description of the drawings]
FIG. 1A is a refrigerant circuit diagram showing a multi-chamber air conditioner according to a first embodiment of the present invention.
(B) is a refrigerant circuit diagram showing a multi-room air conditioner according to a second embodiment of the present invention.
FIG. 2A is a refrigerant circuit diagram showing a multi-room air conditioner according to a third embodiment of the present invention.
(B) is a refrigerant circuit diagram showing a multi-room air conditioner according to a fourth embodiment of the present invention.
FIG. 3 is a refrigerant circuit diagram showing a multi-room air conditioner according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Indoor unit 4a Indoor side heat exchanger 5 Indoor unit 5a Indoor side heat exchanger 6 Indoor unit 6a Indoor side heat exchanger 7 Shunt control unit 7a Electromagnetic switching valve 7b Electromagnetic switching Valve 8 Split flow control unit 8a Electromagnetic switching valve 8b Electromagnetic switching valve 9 Split flow control unit 9a Electromagnetic switching valve 9b Electromagnetic switching valve 10 Accumulator 11 Oil separator 12 Expansion valve 13 First piping 14 Second piping 15 Third piping 16 Fourth piping 17 Fifth piping 18 First bypass passage 19 Second bypass passage 20 Electromagnetic switching valve 21 Electromagnetic switching valve 22 Capillary tube 23 Capillary tube 24a Electromagnetic switching valve 24b Electromagnetic switching valve

Claims (4)

An outdoor unit in which a compressor, a flow path switching valve, an outdoor heat exchanger, an expansion valve are sequentially connected by a refrigerant pipe;
A plurality of indoor units connected to the outdoor unit, wherein expansion valves and indoor heat exchangers are sequentially connected by refrigerant piping;
Intervening between the outdoor unit and the indoor unit, one end is connected to the indoor heat exchanger side pipe of the indoor unit, and the other end is branched into two, each connected to a refrigerant pipe connected to the outdoor unit with an open / close valve A multi-chamber air conditioner comprising a plurality of divided flow control units,
The outdoor unit is a discharge side pipe of a compressor, and includes a refrigerant pipe branched from between the compressor and the flow path switching valve.
Bypass the first bypass passage having an on-off valve that bypasses the discharge side piping and the suction side piping of the compressor, the refrigerant piping that branches from between the compressor and the flow path switching valve, and the suction side piping. A second bypass passage with an open / close valve
The discharge side pipe is connected to the expansion valve side of each of the plurality of indoor units, and the suction side pipe is connected to one refrigerant pipe branched from the diversion control unit, from between the compressor and the flow path switching valve. The branched refrigerant pipe is connected to the other branched refrigerant pipe of the shunt control unit,
The on / off valves of the branch flow control unit connected to the refrigerant pipe branched from between the compressor and the flow path switching valve are both closed, and the temperature of the refrigerant discharged from the compressor has reached a certain set value. When
A multi-room air conditioner characterized in that the on-off valve provided on the first bypass passage and the on-off valve provided on the second bypass passage are opened. The multi-room air conditioner according to claim 1, wherein the flow path switching valve is a four-way valve. The multi-chamber air conditioner according to claim 1, wherein the flow path switching valve includes a pair of electromagnetic on-off valves. The multi-chamber air conditioner according to claim 1, 2, or 3, wherein a capillary tube is attached to each of the first bypass path and the second bypass path.

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