JP2017096597A - Air conditioner and electromagnetic valve kit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress temperature rise of an electromagnetic coil of an electromagnetic valve.SOLUTION: In an air conditioner 10 provided with high pressure gas pipe electromagnetic valves 204a, 204b, 204c and low pressure gas pipe electromagnetic valves 206a, 206b, 206c which can be switched so that during cooling operation, indoor units 300a, 300b, 300c and a low pressure gas pipe 130 are communicated, whereas during heating operation, a high pressure gas pipe 120 and indoor units 300a, 300b, 300c are communicated, there are provided: decompressors 203a, 203b, 203c decompressing coolants of the high pressure gas pipe 120 and flowing them in a liquid pipe 110; and heat exchange parts 202a, 202b, 202c performing heat exchange between the coolants that have passed the decompressors 203a, 203b, 203c, electromagnetic coils 208 of the high pressure gas pipe electromagnetic valves 204a, 204b, 204c, and low pressure gas pipe electromagnetic valves 206a, 206b, 206c.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioner and a solenoid valve kit.

An outdoor unit, a plurality of indoor units, and a solenoid valve kit, the solenoid valve kit being installed between the outdoor unit and the indoor unit, one of which is connected to the outdoor unit with a high-pressure gas pipe, a liquid pipe, and Are connected by a low pressure gas pipe, and the other is connected to the indoor unit by a liquid pipe and a gas pipe on the indoor unit side, and the high pressure gas pipe and the low pressure gas pipe are connected to the gas pipe by an electromagnetic valve. A switchable air conditioner is known. In such an air conditioner, a plurality of indoor units can be operated by either cooling or heating, and a plurality of indoor units can be operated by mixing cooling and heating.
In the air conditioner, an outdoor unit including a compressor and an outdoor heat exchanger and a plurality of indoor units including the indoor heat exchanger are connected to each other by an inter-unit pipe via an electromagnetic valve kit. And one end of the outdoor heat exchanger is alternatively branched and connected to the refrigerant discharge pipe and the refrigerant suction pipe of the compressor, the inter-unit pipe is connected to the refrigerant discharge pipe, and the high-pressure gas pipe A low-pressure gas pipe connected to the refrigerant suction pipe and a liquid pipe connected to the other end of the outdoor heat exchanger. The solenoid valve kit has a configuration in which the high-pressure gas pipe, the low-pressure gas pipe, and the liquid pipe are switched to perform a cooling operation or a heating operation, or a mixture of the heating operation and the cooling operation.
According to the above configuration, when the indoor unit is operated as a heating operation, the electromagnetic valve installed in the high pressure gas pipe connecting the outdoor unit and the indoor unit in the electromagnetic valve kit is opened and installed in the low pressure gas pipe. Close the solenoid valve. When the indoor unit is operated for cooling operation, the solenoid valve installed in the high-pressure gas pipe connecting the outdoor unit and the indoor unit in the solenoid valve kit is closed, and the solenoid valve installed in the low-pressure gas pipe is opened. And
In the conventional configuration, when the indoor unit is operated as a heating operation, since the high-temperature and high-pressure refrigerant passes through the electromagnetic valve installed in the high-pressure gas pipe, the temperature of the electromagnetic coil of the electromagnetic valve increases. It was. Also, when the indoor unit is operated for cooling operation, the low-temperature and low-pressure refrigerant passes through the electromagnetic valve installed in the low-pressure gas pipe, but the temperature of the electromagnetic coil is high because the ambient temperature in the place where the electromagnetic valve is installed is high. And the liquid pipe and the low-pressure gas pipe have a temperature lower than the ambient temperature, and therefore there is a problem that condensation occurs on the surfaces of the liquid pipe and the low-pressure gas pipe.
In order to solve these problems, the solenoid valve casing is divided so that the solenoid valve body and the solenoid coil are separated from each other, and the space on the solenoid valve body side is filled with foamed resin to prevent condensation. There has been proposed one that secures heat dissipation by opening the space on the coil side (see, for example, Patent Document 1). For solenoid valve kits (collective solenoid valve kits) that can be connected to multiple indoor units, the solenoid valve body side is filled with foamed resin, the solenoid coil is placed in an open space, and the solenoid coil has failed due to temperature rise. In order to facilitate the replacement work at the time, there has been proposed one in which the side surface of the collective solenoid valve kit is an open space (for example, see Patent Document 2).

Japanese Utility Model Publication No. 3-73842 JP 2014-163657 A

However, the ambient temperature when the solenoid valve is placed in a poorly ventilated area surrounded by walls such as corners, when it is strongly affected by solar radiation near the rooftop, or when there is a large heating element nearby. When it is arranged in a place where the height is high, there is a problem that sufficient heat radiation cannot be performed and the temperature of the electromagnetic coil rises. In addition, in the case of the collective solenoid valve kit, as the number of connections increases, the number of electromagnetic coils increases and the amount of heat generation increases, as well as the electromagnetic coils that are located in the center and are affected by the adjacent electromagnetic coils on both sides Even if the electromagnetic coil is disposed in the open space, sufficient heat radiation cannot be performed, and the temperature of the electromagnetic coil is likely to rise.
This invention solves the said subject, and it aims at enabling it to suppress the temperature rise of the electromagnetic coil of a solenoid valve.

  In order to achieve the above object, the present invention includes an outdoor unit, a plurality of indoor units, and a high-pressure gas pipe, a liquid pipe, and a low-pressure gas pipe that connect the outdoor unit to the plurality of indoor units. At least one electromagnetic valve that is switched to communicate the indoor unit and the low-pressure gas pipe during cooling operation and to communicate the high-pressure gas pipe and the indoor unit during heating operation. In the air conditioner capable of operating the indoor unit by either cooling or heating and operating a plurality of the indoor units by mixing cooling and heating, the refrigerant in the high-pressure gas pipe is decompressed. And a heat exchanger for exchanging heat between the refrigerant after passing through the pressure reducer and the electromagnetic coil of the electromagnetic valve.

The present invention further includes an electromagnetic valve kit connected between the outdoor unit and the plurality of indoor units, wherein the electromagnetic valve kit includes the high-pressure gas pipe, the liquid pipe, and the low-pressure gas pipe. Connected to the outdoor unit, and connected to the indoor unit by an indoor unit side liquid pipe and a gas pipe, and the high pressure gas pipe includes an in-kit high pressure gas pipe disposed in the solenoid valve kit, The liquid pipe includes an in-kit liquid pipe disposed in the electromagnetic valve kit, the low-pressure gas pipe includes an in-kit low-pressure gas pipe disposed in the electromagnetic valve kit, and the electromagnetic valve performs cooling operation. In this case, the gas pipe and the low-pressure gas pipe in the kit are communicated with each other, and during the heating operation, the high-pressure gas pipe and the liquid pipe are switched to communicate between the high-pressure gas pipe in the kit and the gas pipe. Tube and Serial refrigerant circuit connected via a pressure reducer is characterized in that a bypass pipe which connects the kit in liquid pipe and the kit in the high-pressure gas pipe.
Further, the present invention is characterized in that one end of a refrigerant circuit that connects the high-pressure gas pipe and the liquid pipe via the decompressor is connected to a lower portion of the high-pressure gas pipe.

  Further, the present invention allows a high-pressure gas pipe, a low-pressure gas pipe, a liquid pipe, and a gas pipe connected to the indoor unit to communicate with the low-pressure gas pipe at the time of cooling operation and at the time of heating operation. An electromagnetic valve that is switched so as to communicate with a high-pressure gas pipe; a decompressor that decompresses the refrigerant in the high-pressure gas pipe and flows the refrigerant into the liquid pipe; and a refrigerant after passing through the decompressor and an electromagnetic coil of the solenoid valve Provided is a solenoid valve kit comprising a heat exchanging section for performing heat exchange.

  According to the air conditioner and the solenoid valve kit of the present invention, the refrigerant in the high-pressure gas pipe is decompressed by the decompressor, and the heat exchange unit exchanges heat between the refrigerant decompressed by the decompressor and the electromagnetic coil of the solenoid valve. And since an electromagnetic coil can be cooled, the temperature rise of an electromagnetic coil can be suppressed effectively.

It is a refrigerant circuit figure of the air harmony device concerning a 1st embodiment of the present invention. It is the schematic diagram which looked at the structure of the solenoid valve kit from the side. It is a refrigerant circuit figure of the air harmony device at the time of heating operation. It is a refrigerant circuit figure of the air harmony device at the time of cooling and heating mixed operation. It is a refrigerant circuit figure of the air harmony device in a 2nd embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a refrigerant circuit diagram of the air-conditioning apparatus according to the first embodiment of the present invention.
The air conditioner 10 includes an outdoor unit 100, a plurality of indoor units 300a, 300b, and 300c connected to the outdoor unit 100, and an inter-unit pipe 20 that connects the outdoor unit 100 and the indoor units 300a, 300b, and 300c. The electromagnetic valve kits 200a, 200b, and 200c connected between the outdoor unit 100 and the indoor units 300a, 300b, and 300c are provided.

The air conditioner 10 is capable of cooling or heating all of the indoor units 300a, 300b, and 300c, and is mixed with cooling and heating in which the cooling operation and the heating operation are mixed between the indoor units 300a, 300b, and 300c. Driving is possible.
Here, a configuration in which three indoor units 300a, 300b, and 300c are connected in parallel to the outdoor unit 100 via the inter-unit pipe 20 will be described as an example, but the present invention is limited to this. However, two or more indoor units may be connected in parallel. In the first embodiment, the number of outdoor units 100 is one. However, the present invention is not limited to this, and a plurality of outdoor units may be connected in parallel.

The outdoor unit 100 includes a compressor 101, an oil separator 102 that separates and returns the refrigeration oil contained in the refrigerant discharged from the compressor 101 to the compressor 101, a cooling operation, a heating operation, and a cooling operation and a heating operation. The four-way valve 103 that switches the refrigerant circuit according to the operating state of the mixed operation, the outdoor heat exchanger 104 that radiates and absorbs heat from the outside air, and the outdoor expansion valve 105 are provided. In the outdoor heat exchanger 104, heat exchange is promoted by blowing air from a blower (not shown).
One end of the outdoor heat exchanger 104, the discharge pipe 101a of the compressor 101, and the suction pipe 101b of the compressor 101 are connected to the four-way valve 103, respectively. One end of the outdoor heat exchanger 104 is alternatively connected to the discharge pipe 101 a and the suction pipe 101 b by switching the four-way valve 103.
The outdoor expansion valve 105 is provided on the other end side of the outdoor heat exchanger 104.

  The indoor units 300a, 300b, and 300c include indoor heat exchangers 302a, 302b, and 302c that exchange heat with the air-conditioned room, and indoor expansion valves 301a, 301b, and 301c provided on one end side of the indoor heat exchangers 302a, 302b, and 302c. With. In the indoor heat exchangers 302a, 302b, and 302c, heat exchange is promoted by blowing air from a blower (not shown).

The inter-unit pipe 20 includes a high-pressure gas pipe 120 that connects the discharge pipe 101a side of the compressor 101 and the solenoid valve kits 200a, 200b, and 200c, and a suction pipe 101b side of the compressor 101 and the solenoid valve kits 200a, 200b, and 200c. And a liquid pipe 110 that connects the other end of the outdoor heat exchanger 104 and the solenoid valve kits 200a, 200b, and 200c.
The inter-unit piping 20 includes indoor unit side liquid pipes 350a, 350b, which connect the solenoid valve kits 200a, 200b, 200c and one end side of the indoor heat exchangers 302a, 302b, 302c of the indoor units 300a, 300b, 300c, 350c, and gas pipes 351a, 351b, 351c that connect the solenoid valve kits 200a, 200b, 200c and the other end sides of the indoor heat exchangers 302a, 302b, 302c of the indoor units 300a, 300b, 300c.

Specifically, the high-pressure gas pipe 120 includes an outdoor high-pressure gas pipe 150 that connects the outdoor unit 100 and each of the electromagnetic valve kits 200a, 200b, and 200c, and an in-kit high-pressure gas that is provided in the electromagnetic valve kits 200a, 200b, and 200c. Tubes 151a, 151b, and 151c are provided.
The low-pressure gas pipe 130 includes an outdoor low-pressure gas pipe 160 that connects the outdoor unit 100 and the electromagnetic valve kits 200a, 200b, and 200c, and in-kit low-pressure gas pipes 161a and 161b provided in the electromagnetic valve kits 200a, 200b, and 200c. 161c.
The liquid pipe 110 includes an outdoor liquid pipe 170 that connects the outdoor unit 100 and the electromagnetic valve kits 200a, 200b, and 200c, and kit internal liquid pipes 171a, 171b, and 171c provided in the electromagnetic valve kits 200a, 200b, and 200c. Is provided.

  The solenoid valve kits 200a, 200b, and 200c include a high-pressure gas pipe 151a, 151b, and 151c in the kit, a low-pressure gas pipe 161a, 161b, and 161c in the kit, a liquid pipe 171a, 171b, and 171c in the kit, and a high-pressure gas pipe in the kit. High pressure gas pipe solenoid valves 204a, 204b, 204c (solenoid valves) provided in 151a, 151b, 151c, and low pressure gas pipe solenoid valves 206a, 206b, 206c (solenoid valves) provided in the in-kit low pressure gas pipes 161a, 161b, 161c ), And balance pipes 155a, 155b, and 155c for connecting the high pressure gas pipes 151a, 151b, and 151c in the kit and the low pressure gas pipes 161a, 161b, and 161c in the kit, and balance pipe electromagnetics provided in the balance pipes 155a, 155b, and 155c. Valves 205a, 205b, 205c (electric A valve) and.

  The solenoid valve kits 200a, 200b, and 200c connect the high-pressure gas pipes 151a, 151b, and 151c in the kit and the liquid pipes 171a, 171b, and 171c in the kit so as to bypass the high-pressure gas pipe solenoid valves 204a, 204b, and 204c. Bypass pipes 201a, 201b, and 201c, decompressors 203a, 203b, and 203c that decompress the refrigerant flowing through the bypass pipes 201a, 201b, and 201c, and refrigerant and high-pressure gas pipe electromagnetic after passing through the decompressors 203a, 203b, and 203c Heat exchangers 202a, 202b, and 202c that exchange heat with the valves 204a, 204b, and 204c, the low pressure gas pipe solenoid valves 206a, 206b, and 206c and the balance pipe solenoid valves 205a, 205b, and 205c are provided.

Furthermore, the solenoid valve kits 200a, 200b, and 200c include casings 210a, 210b, and 210c. The casings 210a, 210b, and 210c include high-pressure gas pipes 151a, 151b, and 151c in the kit and low-pressure gas pipes 161a in the kit. 161b, 161c, liquid tubes 171a, 171b, 171c in the kit, high pressure gas pipe solenoid valves 204a, 204b, 204c, low pressure gas pipe solenoid valves 206a, 206b, 206c, balance pipes 155a, 155b, 155c, balance pipe solenoid valves 205a , 205b, 205c, bypass pipes 201a, 201b, 201c, decompressors 203a, 203b, 203c, and heat exchange units 202a, 202b, 202c are housed.
The in-kit high-pressure gas pipes 151a, 151b, 151c and the in-kit low-pressure gas pipes 161a, 161b, 161c are merged into one merged pipe 175a, 175b, 175c. The gas pipes 351a, 351b, 351c are connected to the junction pipes 175a, 175b, 175c.

The decompressors 203a, 203b, and 203c are motor-operated valves whose opening degree can be adjusted.
Four-way valve 103, outdoor expansion valve 105, indoor expansion valves 301a, 301b, 301c, high pressure gas pipe solenoid valves 204a, 204b, 204c, balance pipe solenoid valves 205a, 205b, 205c, low pressure gas pipe solenoid valves 206a, 206b, 206c, The decompressors 203a, 203b, and 203c are controlled in opening degree and switching state by a control unit (not shown) of the outdoor unit 100. Moreover, the said control part acquires the temperature of the discharge refrigerant | coolant of the compressor 101 detected by a temperature sensor (not shown).

The bypass pipes 201a, 201b, and 201c are refrigerant pipes that connect the in-kit high-pressure gas pipes 151a, 151b, and 151c and the in-kit liquid pipes 171a, 171b, and 171c in the casings 210a, 210b, and 210c. One end 182a, 182b, 182c (one end of the refrigerant circuit) of the bypass pipes 201a, 201b, 201c is located in the kit upstream of the high-pressure gas pipe solenoid valves 204a, 204b, 204c in the refrigerant flow direction during heating operation. The high-pressure gas pipes 151a, 151b, and 151c are connected.
The other ends 183a, 183b, 183c of the bypass pipes 201a, 201b, 201c are connected to the in-kit liquid pipes 171a, 171b, 171c in the casings 210a, 210b, 210c.
The decompressors 203a, 203b, and 203c are provided between the one end 182a, 182b, and 182c and the other end 183a, 183b, and 183c in the bypass pipes 201a, 201b, and 201c.

FIG. 2 is a schematic view of the configuration of the solenoid valve kit 200a viewed from the side. Since the solenoid valve kits 200a, 200b, and 200c have the same configuration, the solenoid valve kit 200a will be described in detail here as a representative, and description of the solenoid valve kits 200b and 200c will be omitted. Note that the vertical direction of the electromagnetic valve kit 200a coincides with the vertical direction of the paper surface of FIG.
As shown in FIG. 2, the in-kit high-pressure gas pipe 151a, the in-kit low-pressure gas pipe 161a, the in-kit liquid pipe 171a, and the bypass pipe 201a are arranged in the casing 210a.

The bypass pipe 201a has one end 182a connected to the lower part of the in-kit high-pressure gas pipe 151a having a circular cross section extending in the substantially horizontal direction, and the other end 183a connected to the lower part of the in-kit liquid pipe 171a having a circular cross section extending in the substantially horizontal direction. It is connected. Specifically, one end 182a is connected to the center of the lower surface of the in-kit high-pressure gas pipe 151a, and the other end 183a is connected to the center of the lower surface of the in-kit liquid pipe 171a.
A part of the refrigerant flowing through the high-pressure gas pipe 151a in the kit flows into the bypass pipe 201a due to the pressure difference of the refrigerant between the high-pressure gas pipe 151a in the kit and the liquid pipe 171a in the kit, and from the high-pressure gas pipe 151a in the kit. It flows into the liquid tube 171a in the kit.

  The low-pressure gas pipe electromagnetic valve 206a includes an electromagnetic valve main body 207 that opens and closes the flow path of the in-kit low-pressure gas pipe 161a, and an electromagnetic coil 208 that drives the electromagnetic valve main body 207. Although not shown in FIG. 2, the high-pressure gas pipe solenoid valve 204a and the balance pipe solenoid valve 205a are similarly provided with a solenoid valve body 207 and a solenoid coil 208, respectively.

The heat exchanging section 202a exchanges heat between the refrigerant after passing through the pressure reducer 203a and the electromagnetic coils 208 of the low pressure gas pipe electromagnetic valve 206a, the balance pipe electromagnetic valve 205a, and the high pressure gas pipe electromagnetic valve 204a. It is.
In the present embodiment, the heat exchanging portion 202a is a portion where the downstream portion of the decompressor 203a and each electromagnetic coil 208 are in contact with each other at the outer peripheral portion of the bypass pipe 201a, and heat conduction is performed at this contact portion. The electromagnetic coils 208 of the low-pressure gas pipe solenoid valve 206a, the balance pipe solenoid valve 205a, and the high-pressure gas pipe solenoid valve 204a are arranged side by side in the axial direction of the bypass pipe 201a and sequentially contact the outer periphery of the bypass pipe 201a.
That is, in the heat exchange unit 202a, each electromagnetic coil 208 is cooled by heat exchange with the refrigerant flowing through the bypass pipe 201a on the downstream side of the decompressor 203a. The heat exchange unit 202a may be configured by winding the bypass pipe 201a around each electromagnetic coil 208.

  Moreover, in the heat exchange part 202a, as long as the outer peripheral part of the bypass pipe 201a and each electromagnetic coil 208 can exchange heat, they may be in any way. For example, the outer peripheral part of the bypass pipe 201a and each electromagnetic coil 208 may be simply brought into contact, or the outer peripheral part of the bypass pipe 201a may be coupled to each electromagnetic coil 208 with solder or the like. Also, the bypass pipe 201a A heat conductive member such as a heat conductive sheet or heat conductive grease may be interposed between the outer peripheral portion of each and the electromagnetic coils 208.

Next, the operation | movement at the time of air_conditionaing | cooling operation of the outdoor unit 100, indoor unit 300a, 300b, 300c, and electromagnetic valve kit 200a, 200b, 200c is demonstrated.
FIG. 1 shows a state during the cooling operation. During the cooling operation, the four-way valve 103 is set so that the refrigerant flows in the direction of the solid line in the four-way valve 103 of FIG. During the cooling operation, the high pressure gas pipe solenoid valves 204a, 204b, and 204c are closed, and the balance pipe solenoid valves 205a, 205b, and 205c and the low pressure gas pipe solenoid valves 206a, 206b, and 206c are opened. The flow direction of the refrigerant during the cooling operation is illustrated by solid and broken arrows in FIG.

The high-temperature and high-pressure gas refrigerant discharged from the compressor 101 passes through the four-way valve 103 and flows into the outdoor heat exchanger 104 after the refrigeration oil is separated by the oil separator 102. The high-pressure liquid refrigerant that radiates and condenses to the outside air by the outdoor heat exchanger 104 passes through the outdoor expansion valve 105 and then flows to the liquid pipe 110. At this time, the opening degree of the outdoor expansion valve 105 is controlled so that the degree of supercooling of the refrigerant at the outlet of the outdoor heat exchanger 104 becomes a predetermined value.
The high-pressure liquid refrigerant that has flowed into the liquid pipe 110 flows through the outdoor liquid pipe 170, flows into the electromagnetic valve kits 200a, 200b, and 200c, flows through the in-kit liquid pipes 171a, 171b, and 171c, and the indoor unit side liquid pipe 350a, It flows to the indoor units 300a, 300b, 300c through 350b, 350c. This refrigerant passes through the indoor expansion valves 301a, 301b, and 301c of the indoor units 300a, 300b, and 300c to form a low-pressure and low-temperature gas-liquid two-layer, and evaporates in the indoor heat exchangers 302a, 302b, and 302c. Cool down.

  The refrigerant that has become a low-pressure gas state in the indoor heat exchangers 302a, 302b, and 302c flows into the electromagnetic valve kits 200a, 200b, and 200c through the gas pipes 351a, 351b, and 351c, and the low-pressure gas pipes 161a, 161b, It flows through 161c. The refrigerant flowing through the low-pressure gas pipes 161a, 161b, 161c in the kit flows into the outdoor unit 100 through the outdoor low-pressure gas pipe 160 and is sucked into the compressor 101.

Further, during the cooling operation, a part of the high-temperature and high-pressure gas refrigerant discharged from the compressor 101 flows not to the four-way valve 103 side but to the outdoor high-pressure gas pipe 150 as shown by the broken arrow, and the solenoid valve kit It flows into the high-pressure gas pipes 151a, 151b, 151c in the kits 200a, 200b, 200c.
During the cooling operation, the high-pressure gas pipe solenoid valves 204a, 204b, and 204c are in a closed state, so that the refrigerant flowing into the high-pressure gas pipes 151a, 151b, and 151c in the kit flows into the bypass pipes 201a, 201b, and 201c.

The refrigerant that has flowed into the bypass pipes 201a, 201b, and 201c is decompressed by the decompressors 203a, 203b, and 203c and becomes low temperature. The low-temperature refrigerant exchanges heat with the electromagnetic coils 208 of the electromagnetic valve kits 200a, 200b, and 200c when passing through the heat exchanging portions 202a, 202b, and 202c, thereby cooling the electromagnetic coils 208. Specifically, the electromagnetic coils 208 of the high-pressure gas pipe solenoid valves 204a, 204b, 204c, the balance pipe solenoid valves 205a, 205b, 205c, and the low-pressure gas pipe solenoid valves 206a, 206b, 206c of the indoor units 300a, 300b, 300c. Is cooled by the heat exchanging units 202a, 202b, and 202c.
The refrigerant that exchanges heat in the heat exchange units 202a, 202b, and 202c merges with the refrigerant flowing through the in-kit liquid tubes 171a, 171b, and 171c, and flows toward the indoor units 300a, 300b, and 300c. Here, the opening degree of the decompressors 203a, 203b, 203c is controlled so that the degree of supercooling of the refrigerant after joining the in-kit liquid tubes 171a, 171b, 171c becomes a predetermined value.

  In the first embodiment, each electromagnetic coil 208 can be cooled by the refrigerant that flows from the high-pressure gas pipe 120 to the bypass pipes 201a, 201b, and 201c and is cooled by the decompressors 203a, 203b, and 203c. The temperature rise of 208 can be suppressed. Furthermore, since the refrigerant flowing through the high-pressure gas pipe 120 during the cooling operation can be returned to the liquid pipe 110 from the bypass pipes 201a, 201b, and 201c, a shortage of refrigerant due to the accumulation of refrigerant in the high-pressure gas pipe 120 during the cooling operation is avoided. be able to.

In addition, when the amount of refrigerant accumulated in the high-pressure gas pipe 120 is small, such as when the air conditioner 10 is started, immediately after the oil recovery operation is performed, or when the heating operation or the cooling / heating mixed operation is performed immediately before, the air The harmony device 10 receives the signal from the outdoor unit 100 and fully closes the decompressors 203a, 203b, 203c for a predetermined time. That is, when the amount of accumulated refrigerant is small during the cooling operation, the decompressors 203a, 203b, and 203c are controlled so that the refrigerant does not flow into the bypass pipes 201a, 201b, and 201c. The decompressors 203a, 203b, and 203c are controlled in the opening direction after a predetermined time has elapsed and the refrigerant begins to accumulate in the high-pressure gas pipe 120.
Thereby, when the refrigerant is not accumulated in the high pressure gas pipe 120, the refrigerant does not excessively bypass the liquid pipe 110 through the bypass pipes 201a, 201b, and 201c. For this reason, the fall of the cooling capability by the supercooling degree of the refrigerant | coolant of the exit of the outdoor heat exchanger 104 becoming small can be suppressed.

Further, one ends 182a, 182b, and 182c of the bypass pipes 201a, 201b, and 201c are connected to lower portions of the high-pressure gas pipes 151a, 151b, and 151c in the kit of the high-pressure gas pipe 120 (see FIG. 2). As a result, among the refrigerant accumulated in the high-pressure gas pipe 120, the liquid refrigerant accumulated in the lower part can be preferentially guided to the bypass pipes 201a, 201b, 201c. For this reason, each electromagnetic coil 208 can be rapidly cooled.
Furthermore, the other ends 183a, 183b, and 183c of the bypass pipes 201a, 201b, and 201c are connected to the lower part of the liquid pipes 171a, 171b, and 171c in the liquid pipe 110 (see FIG. 2). As a result, the refrigerating machine oil has returned together with the liquid refrigerant accumulated in the lower portion of the high-pressure gas pipe 120 in a situation where the refrigerant is flowing in a gas-liquid two-phase state without sufficient supercooling of the liquid pipe 110. Even in this case, since the refrigeration oil merges with the liquid refrigerant flowing in the lower part of the liquid pipe 110, the refrigeration oil can be smoothly returned to the compressor 101 side.

FIG. 3 is a refrigerant circuit diagram of the air-conditioning apparatus 10 during heating operation.
During the heating operation, the four-way valve 103 is set so that the refrigerant flows in the direction of the solid line in the four-way valve 103 of FIG. During the cooling operation, the high pressure gas pipe solenoid valves 204a, 204b, and 204c are opened, and the balance pipe solenoid valves 205a, 205b, and 205c and the low pressure gas pipe solenoid valves 206a, 206b, and 206c are closed. The flow direction of the refrigerant during the heating operation is illustrated by solid and broken arrows in FIG.

The high-temperature and high-pressure gas refrigerant discharged from the compressor 101 flows into the high-pressure gas pipe 120 after the refrigerating machine oil is separated by the oil separator 102, passes through the outdoor high-pressure gas pipe 150, and the solenoid valve kits 200a, 200b, and 200c. And flows through the high-pressure gas pipes 151a, 151b, 151c in the kit. The refrigerant flowing through the high-pressure gas pipes 151a, 151b, 151c in the kit flows into the indoor units 300a, 300b, 300c through the gas pipes 351a, 351b, 351c, and condenses in the indoor heat exchangers 302a, 302b, 302c. Heat the room. The refrigerant that has passed through the indoor heat exchangers 302a, 302b, 302c flows into the electromagnetic valve kits 200a, 200b, 200c through the indoor expansion valves 301a, 301b, 301c and the indoor unit side liquid pipes 350a, 350b, 350c. At this time, the opening degree of the indoor expansion valves 301a, 301b, and 301c is controlled so that the degree of supercooling of the refrigerant at the outlets of the indoor heat exchangers 302a, 302b, and 302c becomes a set value.
The refrigerant that has flowed into the electromagnetic valve kits 200a, 200b, and 200c flows into the outdoor liquid tube 170 through the liquid tubes 171a, 171b, and 171c in the kit, and flows into the outdoor unit 100. The refrigerant flowing into the outdoor unit 100 passes through the outdoor expansion valve 105 to be in a low-pressure and low-temperature gas-liquid two-layer state, absorbs heat in the outdoor heat exchanger 104 and evaporates, enters a low-pressure gas state, passes through the four-way valve 103. Sucked into the compressor 101.

Further, during the heating operation, a part of the refrigerant discharged from the compressor 101 and passing through the high-pressure gas pipes 151a, 151b, 151c in the kit branches as shown by broken arrows in FIG. 3 and bypass pipes 201a, 201b. , 201c.
The refrigerant that has flowed into the bypass pipes 201a, 201b, and 201c is decompressed by the decompressors 203a, 203b, and 203c and becomes low temperature. The low-temperature refrigerant exchanges heat with the electromagnetic coils 208 of the indoor units 300a, 300b, and 300c when passing through the heat exchanging units 202a, 202b, and 202c, and cools the electromagnetic coils 208. Specifically, the electromagnetic coils 208 of the high-pressure gas pipe solenoid valves 204a, 204b, 204c, the balance pipe solenoid valves 205a, 205b, 205c, and the low-pressure gas pipe solenoid valves 206a, 206b, 206c of the indoor units 300a, 300b, 300c. Is cooled by the heat exchanging units 202a, 202b, and 202c.

The refrigerant that has exchanged heat in the heat exchange units 202a, 202b, and 202c merges with the refrigerant that flows through the in-kit liquid tubes 171a, 171b, and 171c, and flows to the outdoor unit 100 side. At this time, when the temperature of the refrigerant discharged from the compressor 101 is equal to or higher than a predetermined value, the decompressors 203a, 203b, and 203c are controlled so as to have a predetermined opening degree according to the temperature of the discharged refrigerant. The cooling capacity by the parts 202a, 202b, 202c is increased.
When the heating operation is performed, the output of the compressor 101 increases because the temperature of the outside air is low and the ambient temperature of the installation location of the solenoid valve kits 200a, 200b, and 200c is low. For this reason, although the temperature rise of each electromagnetic coil 208 of the high-pressure gas pipe solenoid valves 204a, 204b, 204c connected to the high-pressure gas pipes 151a, 151b, 151c in the kit also increases, it depends on the temperature of the refrigerant discharged from the compressor 101. Thus, the electromagnetic coils 208 can be effectively cooled by adjusting the opening degree of the decompressors 203a, 203b, and 203c.

  In the heating operation, when the temperature of the refrigerant discharged from the compressor 101 is lower than a predetermined value, the decompressors 203a, 203b, and 203c are controlled to be fully closed or the opening degree is reduced, and the kit The refrigerant flowing from the internal high pressure gas pipes 151a, 151b, 151c to the bypass pipes 201a, 201b, 201c decreases. Thereby, each electromagnetic coil 208 is cooled mainly by natural heat radiation to the surrounding outside air, and is prevented from being excessively cooled. Furthermore, since the amount of refrigerant that bypasses the indoor units 300a, 300b, and 300c through the bypass pipes 201a, 201b, and 201c is reduced, the heating performance is deteriorated due to the refrigerant bypassing the indoor heat exchangers 302a, 302b, and 302c. Can be avoided.

FIG. 4 is a refrigerant circuit diagram of the air-conditioning apparatus 10 during the cooling / heating mixed operation. FIG. 4 shows a cooling / heating mixed operation state when the outdoor heat exchanger 104 is used as a condenser.
During the cooling / heating mixed operation of FIG. 4, the four-way valve 103 is set so that the refrigerant flows in the direction of the solid line in the four-way valve 103. Further, during the cooling and heating mixed operation, the high pressure gas pipe solenoid valves 204a and 204c are closed, the high pressure gas pipe solenoid valve 204b is closed, the balance pipe solenoid valves 205a and 205c are opened, and the balance pipe solenoid valve. 205b is closed, the low pressure gas pipe solenoid valves 206a and 206c are opened, and the low pressure gas pipe solenoid valve 206b is closed.
The flow direction of the refrigerant during the cooling and heating mixed operation is shown by solid and broken arrows in FIG.

FIG. 4 shows a state where the indoor units 300a and 300c are in the cooling operation and the indoor unit 300b is in the heating operation as an example of the cooling and heating mixed operation.
In FIG. 4, since the outdoor heat exchanger 104 is used as a condenser, the four-way valve 103 is set so that the refrigerant flows in the direction of the solid line in the four-way valve 103 of FIG.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 101 branches in two directions after the refrigerating machine oil is separated by the oil separator 102, and one of the refrigerant flows into the four-way valve 103 for cooling and flows into the outdoor heat exchanger 104. On the other hand, the other flows to the high-pressure gas pipe 120 for heating.
The refrigerant that has flowed into the outdoor heat exchanger 104 radiates and condenses to the outside air in the outdoor heat exchanger 104, becomes high-temperature liquid refrigerant, passes through the outdoor expansion valve 105, and then flows into the liquid pipe 110. At this time, the outdoor expansion valve 105 is controlled such that the degree of supercooling of the refrigerant at the outlet of the outdoor heat exchanger 104 becomes a predetermined value.

The high-pressure liquid refrigerant that has flowed into the liquid pipe 110 flows into the electromagnetic valve kits 200a and 200c through the outdoor liquid pipe 170, passes through the in-kit liquid pipes 171a and 171c, and the indoor unit side liquid pipes 350a and 350c, thereby the indoor unit 300a. , 300c.
The refrigerant flowing into the indoor units 300a and 300c becomes a low-pressure and low-temperature gas-liquid two-layer by the indoor expansion valves 301a and 301c, and cools the room by being evaporated by the indoor heat exchangers 302a and 302c. The refrigerant that has become a low-pressure gas state in the indoor heat exchangers 302a and 302c flows into the indoor units 300a and 300c, and flows into the outdoor unit 100 through the low-pressure gas pipes 161a and 161c in the kit and the outdoor low-pressure gas pipe 160. And sucked into the compressor 101.

A part of the refrigerant discharged from the compressor 101 and branching to the other side and flowing into the high-pressure gas pipe 120 passes through the high-pressure gas pipes 151a and 151c in the kit as shown by broken arrows in FIG. Flow into the bypass pipes 201a and 201c.
The refrigerant that has flowed into the bypass pipes 201a and 201c is decompressed by the decompressors 203a and 203c and becomes low temperature. This low-temperature refrigerant exchanges heat with the electromagnetic coils 208 of the indoor units 300a and 300c when passing through the heat exchanging portions 202a and 202c, thereby cooling the electromagnetic coils 208. Specifically, the high-pressure gas pipe solenoid valves 204a and 204c, the balance pipe solenoid valves 205a and 205c, and the low-pressure gas pipe solenoid valves 206a and 206c of the indoor units 300a and 300c are heat exchange units 202a and 202c. Cooled by.
The refrigerant that has exchanged heat in the heat exchange units 202a and 202c merges with the refrigerant flowing through the in-kit liquid tubes 171a and 171c, and flows toward the indoor units 300a and 300c. Here, the opening degree of the decompressors 203a and 203c is controlled so that the degree of supercooling of the refrigerant after joining the in-kitt liquid pipes 171a and 171c becomes a predetermined value.

Further, during the cooling and heating mixed operation, all the refrigerant pipes are used, and no refrigerant is accumulated in the refrigerant pipes. Therefore, it is not necessary to flow the refrigerant through the bypass pipes 201a and 201c for the purpose of preventing this accumulation. For this reason, when the outdoor temperature acquired from an outdoor temperature sensor (not shown) is less than a predetermined value, the outdoor unit 100 fully closes the decompressors 203a and 203c and does not flow the refrigerant through the bypass pipes 201a and 201c. Control as follows. In the electromagnetic valve kits 200a and 200c connected to the indoor units 300a and 300c that are performing the cooling operation, the temperature of the electromagnetic coils 208 of the electromagnetic valve kits 200a and 200c is increased because the refrigerant flowing through the interior becomes a low temperature. , Depending on the ambient temperature of each electromagnetic coil 208. Since the ambient temperature is influenced by the outside air temperature, when the outside air temperature is lower than a predetermined value, the refrigerant is not allowed to flow through the bypass pipes 201a and 201c, and the electromagnetic coils 208 are naturally radiated to bypass. It is possible to prevent the refrigerant from flowing unnecessarily through the tubes 201a and 201c.
For this reason, the refrigerant that has not passed through the outdoor heat exchanger 104 can be prevented from excessively flowing into the liquid pipe 110 from the bypass pipes 201a and 201c, and the degree of supercooling at the outlet of the outdoor heat exchanger 104 is reduced. A decrease in cooling capacity can be suppressed.

Further, when the outdoor temperature acquired from an outdoor temperature sensor (not shown) is equal to or higher than a predetermined value, the outdoor unit 100 sets the opening of the decompressors 203a and 203c to a predetermined opening according to the outdoor temperature. Open to. Thereby, since each electromagnetic coil 208 can be cooled with the refrigerant | coolant which passed through pressure | voltage reduction device 203a, 203c and became low temperature, the temperature rise of each electromagnetic coil 208 can be suppressed effectively.
Further, one ends 182a and 182c of the bypass pipes 201a and 201c are connected to the lower part of the high-pressure gas pipes 151a and 151c in the kit, and the other ends 183a and 183c are connected to the lower parts of the liquid pipes 171a and 171c in the kit. Thereby, since the refrigerating machine oil which accumulates in the lower part of the high pressure gas pipes 151a and 151c in the kit can be returned to the lower part of the liquid pipes 171a and 171c in the kit, the refrigerating machine oil can be smoothly returned to the compressor 101.

The remaining refrigerant discharged from the compressor 101 and branching to the other side and flowing into the high-pressure gas pipe 120 flows through the outdoor high-pressure gas pipe 150 and flows into the electromagnetic valve kit 200b. The high-temperature and high-pressure refrigerant that has flowed into the electromagnetic valve kit 200b flows into the indoor unit 300b through the high-pressure gas pipe 151b and the gas pipe 351b in the kit.
The refrigerant that has flowed into the indoor unit 300b condenses in the indoor heat exchanger 302b to heat the room. At this time, the opening degree of the indoor expansion valve 301b is controlled so that the degree of supercooling of the refrigerant at the outlet of the indoor heat exchanger 302b becomes a set value. The high-pressure liquid refrigerant that has passed through the indoor heat exchanger 302b flows into the electromagnetic valve kit 200b through the indoor unit side liquid pipe 350b, and joins the outdoor liquid pipe 170 through the in-kit liquid pipe 171b.

  The remaining part of the refrigerant branching to the other side and flowing into the high-pressure gas pipe 120 flows into the bypass pipe 201b as shown by the dashed arrows in FIG. The refrigerant that has flowed into the bypass pipe 201b is decompressed by the decompressor 203b and becomes low temperature. This low-temperature refrigerant exchanges heat with each electromagnetic coil 208 of the indoor unit 300b when passing through the heat exchange unit 202b, thereby cooling each electromagnetic coil 208. Specifically, the electromagnetic coils 208 of the high-pressure gas pipe solenoid valve 204b, the balance pipe solenoid valve 205b, and the low-pressure gas pipe solenoid valve 206b of the indoor unit 300b are cooled by the heat exchange unit 202b. The refrigerant that has passed through the heat exchange unit 202b joins the in-kit liquid pipe 171b and flows to the outdoor unit 100 side.

At this time, the decompressor 203b has a predetermined opening degree corresponding to the temperature of the discharge refrigerant required when the temperature of the discharge refrigerant of the compressor 101 is equal to or higher than a predetermined value, and the outside air temperature is equal to or higher than a predetermined value. The opening degree is controlled so as to be a large opening degree within a predetermined opening degree corresponding to the outside air temperature required in this case.
In the solenoid valve kit 200b connected to the indoor unit 300b that is performing the heating operation, the refrigerant flowing through the interior becomes a high temperature. Therefore, the temperature rise of the electromagnetic coil 208 is caused by the temperature of the refrigerant flowing through the interior and the surrounding area of the electromagnetic coil 208. It is affected by both temperature (outside temperature). In the present embodiment, the opening of the decompressor 203b is set to a large opening between a predetermined opening according to the temperature of the discharged refrigerant and a predetermined opening according to the outside air temperature. It is possible to cope with a larger influence between the temperature of the refrigerant and the outside air temperature, and the countermeasure against the increase in the temperature of each electromagnetic coil 208 is on the safe side. For this reason, the temperature rise of each electromagnetic coil 208 can be suppressed effectively.

  Further, when the temperature of the refrigerant discharged from the compressor 101 is a predetermined value less than a predetermined value and the outside air temperature is less than a predetermined value, the decompressor 203b is controlled to be fully closed or the opening degree is reduced. The As a result, the amount of refrigerant flowing through the bypass pipe 201b is reduced, and the amount of refrigerant flowing through the kit internal liquid pipe 171b by bypassing the indoor unit 300b is reduced, thereby avoiding deterioration in heating performance due to the refrigerant bypassing the indoor unit 300b. it can. In this case, each electromagnetic coil 208 is cooled by natural heat dissipation to the surroundings.

  As described above, according to the first embodiment to which the present invention is applied, the air conditioner 10 includes the outdoor unit 100, the plurality of indoor units 300a, 300b, and 300c, and the plurality of outdoor units 100. High-pressure gas pipe 120, liquid pipe 110, and low-pressure gas pipe 130 connected to the indoor units 300a, 300b, and 300c side of the indoor unit 300a, 300b, 300c and the low-pressure gas pipe 130 during the cooling operation. The high pressure gas pipe solenoid valves 204a, 204b, and 204c and the low pressure gas pipe solenoid valves 206a, 206b, and 206c that are switched so as to communicate with the high pressure gas pipe 120 and the indoor units 300a, 300b, and 300c during heating operation. And cooling at least one indoor unit 300a, 300b, 300c. Can be operated in any one of the heating modes, and the plurality of indoor units 300a, 300b, 300c can be operated in a mixture of cooling and heating, and the refrigerant in the high-pressure gas pipe 120 is decompressed to the liquid pipe 110. Reducing decompressors 203a, 203b, 203c flowing, refrigerant after passing through the decompressors 203a, 203b, 203c, and electromagnetic coils 208 of the high pressure gas pipe solenoid valves 204a, 204b, 204c and low pressure gas pipe solenoid valves 206a, 206b, 206c The heat exchange parts 202a, 202b, and 202c which perform heat exchange with are provided. As a result, the refrigerant in the high-pressure gas pipe 120 is decompressed by the decompressors 203a, 203b, and 203c, and the refrigerant decompressed by the decompressors 203a, 203b, and 203c and each electromagnetic coil 208 are heated by the heat exchange units 202a, 202b, and 202c. Since each electromagnetic coil 208 can be cooled by replacement, an increase in temperature of each electromagnetic coil 208 can be effectively suppressed. Further, since the refrigerant in the high-pressure gas pipe 120 that is not used during the cooling operation can be returned to the liquid pipe 110 as the refrigerant that passes through the decompressors 203a, 203b, and 203c, the refrigerant is insufficient due to the accumulation of refrigerant in the high-pressure gas pipe 120. Can be avoided.

The air conditioner 10 includes electromagnetic valve kits 200a, 200b, and 200c connected between the outdoor unit 100 and the plurality of indoor units 300a, 300b, and 300c. The electromagnetic valve kits 200a, 200b, and 200c are: The high-pressure gas pipe 120, the liquid pipe 110, and the low-pressure gas pipe 130 are connected to the outdoor unit 100, and the indoor unit-side liquid pipes 350a, 350b, and 350c and the gas pipes 351a, 351b, and 351c are connected to the indoor units 300a, 300b, 300c, the high pressure gas pipe 120 includes in-kit high pressure gas pipes 151a, 151b, 151c disposed in the electromagnetic valve kits 200a, 200b, 200c, and the liquid pipe 110 includes the electromagnetic valve kits 200a, 200b, 200c. In-kit liquid tubes 171a, 171b, 1 The low-pressure gas pipe 130 includes in-kit low-pressure gas pipes 161a, 161b, and 161c disposed in the solenoid valve kits 200a, 200b, and 200c. The high-pressure gas pipe solenoid valves 204a, 204b, and 204c and the low-pressure gas pipe The solenoid valves 206a, 206b, and 206c communicate the gas pipes 351a, 351b, and 351c with the low-pressure gas pipes 161a, 161b and 161c in the kit during the cooling operation, and the high-pressure gas pipe 151a in the kit during the heating operation. 151b, 151c and the gas pipes 351a, 351b, 351c are switched to communicate with each other, and the refrigerant circuit that connects the high pressure gas pipe 120 and the liquid pipe 110 via the decompressors 203a, 203b, 203c is a high pressure gas in the kit. Tubes 151a, 151b, 151c and kit internal solution tubes 171a, 171b, 17 Bypass pipe 201a which connects the c, 201b, is 201c. As a result, the refrigerant flowing through the bypass pipes 201a, 201b, 201c connecting the in-kit high pressure gas pipes 151a, 151b, 151c and the in-kit liquid pipes 171a, 171b, 171c arranged in the solenoid valve kits 200a, 200b, 200c. Since each electromagnetic coil 208 can be cooled, the temperature rise of each electromagnetic coil 208 can be effectively suppressed with a simple configuration.
Further, the high-pressure gas pipe solenoid valves 204a, 204b, 204c and the low-pressure gas pipe solenoid valves 206a, 206b, 206c can be cooled by the heat exchanging portions 202a, 202b, 202c without exposing them to the outside of the solenoid valve kits 200a, 200b, 200c. . For this reason, it can suppress that the operation sound of high pressure gas pipe solenoid valve 204a, 204b, 204c and low pressure gas pipe solenoid valve 206a, 206b, 206c leaks outside, and it aims at silence of solenoid valve kit 200a, 200b, 200c. Can do.

In addition, when the solenoid valve kits 200a, 200b, and 200c are provided in a poorly ventilated area surrounded by walls such as corners, installed near the rooftop and strongly affected by solar radiation, Even when the surrounding temperature is high, such as when there is a body, the temperature of each electromagnetic coil 208 can be suppressed by cooling with the refrigerant having a low temperature by the decompressors 203a, 203b, 203c.
Furthermore, each electromagnetic coil 208 can be cooled without generating noise as compared with a configuration in which each electromagnetic coil 208 is cooled by blowing air from a fan or the like.

  In addition, one ends 182a, 182b, and 182c of the bypass pipes 201a, 201b, and 201c, which are refrigerant circuits that connect the high pressure gas pipe 120 and the liquid pipe 110 via the decompressors 203a, 203b, and 203c, Since the liquid refrigerant in the refrigerant accumulated in the high-pressure gas pipe 120 that is not used during the cooling operation is accumulated in the lower part of the high-pressure gas pipe 120, the liquid refrigerant is discharged from the bypass pipes 201a, 201b, 201c. The liquid pipe 110 can be returned preferentially.

  The solenoid valve kits 200a, 200b, and 200c include high-pressure gas pipes 151a, 151b, and 151c in the kit that are high-pressure gas pipes 120, low-pressure gas pipes 161a, 161b, and 161c in the kit that are low-pressure gas pipes 130, and liquid pipes. In-kit liquid pipes 171a, 171b, 171c and gas pipes 351a, 351b, 351c connected to the indoor units 300a, 300b, 300c are connected to the low-pressure gas pipes 161a, 161b, 161c in the kit during cooling operation. High-pressure gas pipe solenoid valves 204a, 204b, 204c and low-pressure gas pipe solenoid valves 206a, 206b, 206c, which are switched so as to communicate with the high-pressure gas pipes 151a, 151b, 151c in the kit during heating operation; Refrigerant of inner high pressure gas pipes 151a, 151b, 151c Decompressors 203a, 203b, 203c that depressurize and flow into the liquid tubes 171a, 171b, 171c in the kit, refrigerant after passing through the decompressors 203a, 203b, 203c, high pressure gas pipe solenoid valves 204a, 204b, 204c, and low pressure gas pipes Heat exchange units 202a, 202b, and 202c that perform heat exchange with the electromagnetic coils 208 of the electromagnetic valves 206a, 206b, and 206c are provided. As a result, the refrigerant in the high-pressure gas pipes 151a, 151b, and 151c in the kit is decompressed by the decompressors 203a, 203b, and 203c, and the refrigerant decompressed by the decompressors 203a, 203b, and 203c and each electromagnetic coil 208 are exchanged with the heat exchange unit 202a. , 202b, 202c, and the electromagnetic coils 208 can be cooled by exchanging heat, so that the temperature rise of the electromagnetic coils 208 can be effectively suppressed.

In addition, the said 1st Embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said 1st Embodiment.
In the first embodiment, the bypass pipes 201a, 201b, and 201c have been described as being provided inside the electromagnetic valve kits 200a, 200b, and 200c, but the present invention is not limited to this. For example, the bypass pipe may connect the high-pressure gas pipe 120 and the liquid pipe 110 outside the electromagnetic valve kit.
In the first embodiment, the decompressors 203a, 203b, and 203c have been described as motor-operated valves, but may be capillary tubes.
In the first embodiment, the electromagnetic coils 208 of the high pressure gas pipe solenoid valves 204a, 204b, 204c, the balance pipe solenoid valves 205a, 205b, 205c, and the low pressure gas pipe solenoid valves 206a, 206b, 206c are provided. Although an example of cooling by the heat exchange units 202a, 202b, and 202c has been described, the present invention is not limited to this, and only a part of the electromagnetic coils 208 may be cooled by the heat exchange unit. For example, only the electromagnetic coil 208 of the high-pressure gas pipe solenoid valves 204a, 204b, and 204c having a large temperature rise may be cooled by the heat exchange unit.
Furthermore, in the first embodiment, the heat exchanging portion 202a has been described as the portion where the outer peripheral portion of the bypass pipe 201a contacts the electromagnetic coil 208, but the present invention is not limited to this. . As long as the heat exchange unit can cool the electromagnetic coil by exchanging heat between the bypass pipe and the electromagnetic coil, the bypass pipe and the electromagnetic coil may be in non-contact. Further, the heat exchange unit may be configured by a panel heat exchanger or a double pipe structure in which heat of the bypass pipe is exchanged.

[Second Embodiment]
Hereinafter, a second embodiment to which the present invention is applied will be described with reference to FIG. In the second embodiment, parts that are configured in the same manner as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
In the first embodiment, the configuration in which the electromagnetic valve kits 200a, 200b, and 200c are provided in the indoor units 300a, 300b, and 300c, respectively, has been described. However, in the second embodiment, the plurality of indoor units 300a, The point that one collective electromagnetic valve kit 600 (electromagnetic valve kit) is provided for 300b and 300c is different from the first embodiment. Accordingly, the bypass pipe 601 is integrated into one.

FIG. 5 is a refrigerant circuit diagram of the air-conditioning apparatus 410 according to the second embodiment.
The air conditioner 410 includes an outdoor unit 100, a plurality of indoor units 300a, 300b, and 300c connected to the outdoor unit 100, and an inter-unit pipe 420 that connects the outdoor unit 100 and the indoor units 300a, 300b, and 300c. And a collective solenoid valve kit 600 connected between the outdoor unit 100 and the indoor units 300a, 300b, and 300c.

The inter-unit piping 420 includes a high-pressure gas pipe 520 that connects the discharge pipe 101a side of the compressor 101 and the collective solenoid valve kit 600, and a low-pressure gas that connects the suction pipe 101b side of the compressor 101 and the collective solenoid valve kit 600. A pipe 530 and a liquid pipe 510 connecting the other end side of the outdoor heat exchanger 104 and the collective solenoid valve kit 600 are provided.
The inter-unit piping 420 includes indoor unit side liquid pipes 350a, 350b, and 350c that connect the collective solenoid valve kit 600 and one end side of the indoor heat exchangers 302a, 302b, and 302c of the indoor units 300a, 300b, and 300c. Gas pipes 351a, 351b, 351c that connect the collective solenoid valve kit 600 and the other end sides of the indoor heat exchangers 302a, 302b, 302c of the indoor units 300a, 300b, 300c are provided.

Specifically, the high-pressure gas pipe 520 includes an outdoor high-pressure gas pipe 550 that connects the outdoor unit 100 and the collective solenoid valve kit 600, and an in-kit high-pressure gas pipe 551 provided in the collective solenoid valve kit 600. The high-pressure gas pipe 551 in the kit includes an internal high-pressure gas pipe 558 arranged across the indoor units 300a, 300b, and 300c, and a branched high-pressure gas pipe 551a that branches from the internal high-pressure gas pipe 558 to the indoor units 300a, 300b, and 300c. , 551b, 551c.
The low pressure gas pipe 530 includes an outdoor low pressure gas pipe 560 that connects the outdoor unit 100 and the collective solenoid valve kit 600, and an in-kit low pressure gas pipe 561 provided in the collective solenoid valve kit 600. The low-pressure gas pipe 561 in the kit includes an internal low-pressure gas pipe 568 disposed across the indoor units 300a, 300b, and 300c, and a branched low-pressure gas pipe 561a that branches from the internal low-pressure gas pipe 568 to the indoor units 300a, 300b, and 300c. , 561b, 561c.
The liquid pipe 510 includes an outdoor liquid pipe 570 that connects the outdoor unit 100 and the collective solenoid valve kit 600, and an in-kit liquid pipe 571 provided in the collective solenoid valve kit 600. The in-kit liquid pipe 571 includes an internal liquid pipe 578 arranged across the indoor units 300a, 300b, and 300c, and branch liquid pipes 571a, 571b, and 571c branched from the internal liquid pipe 578 to the indoor units 300a, 300b, and 300c. With.

The collective solenoid valve kit 600 includes a refrigerant circuit portion 600a through which the refrigerant flowing through the indoor unit 300a passes, a refrigerant circuit portion 600b through which the refrigerant flowing through the indoor unit 300b, a refrigerant circuit portion 600c through which the refrigerant flowing through the indoor unit 300c passes, The high-pressure gas pipe 558, the internal low-pressure gas pipe 568, and the internal liquid pipe 578 are housed in a housing 610.
The refrigerant circuit unit 600a includes a branch high-pressure gas pipe 551a, a branch low-pressure gas pipe 561a, a branch liquid pipe 571a, a balance pipe 555a connecting the branch high-pressure gas pipe 551a and the branch low-pressure gas pipe 561a, and a branch high-pressure gas pipe. The high pressure gas pipe solenoid valve 204a provided in the 551a, the low pressure gas pipe solenoid valve 206a provided in the branch low pressure gas pipe 561a, and the balance pipe solenoid valve 205a provided in the balance pipe 555a are provided.

The refrigerant circuit unit 600b includes a branch high-pressure gas pipe 551b, a branch low-pressure gas pipe 561b, a branch liquid pipe 571b, a balance pipe 555b connecting the branch high-pressure gas pipe 551b and the branch low-pressure gas pipe 561b, and a branch high-pressure gas pipe. The high pressure gas pipe solenoid valve 204b provided in the 551b, the low pressure gas pipe solenoid valve 206b provided in the branch low pressure gas pipe 561b, and the balance pipe solenoid valve 205b provided in the balance pipe 555b are provided.
The refrigerant circuit unit 600c includes a branch high-pressure gas pipe 551c, a branch low-pressure gas pipe 561c, a branch liquid pipe 571c, a balance pipe 555c connecting the branch high-pressure gas pipe 551c and the branch low-pressure gas pipe 561c, and a branch high-pressure gas pipe. The high pressure gas pipe solenoid valve 204c provided in the 551c, the low pressure gas pipe solenoid valve 206c provided in the branch low pressure gas pipe 561c, and the balance pipe solenoid valve 205c provided in the balance pipe 555c are provided.

  The branch high-pressure gas pipes 551a, 551b, and 551c and the branch low-pressure gas pipes 561a, 561b, and 561c merge to form one merge pipe 575a, 575b, and 575c. The gas pipes 351a, 351b, 351c are connected to the junction pipes 575a, 575b, 575c. The indoor unit side liquid pipes 350a, 350b, and 350c are connected to the branch liquid pipes 571a, 571b, and 571c.

  The collective solenoid valve kit 600 also includes a bypass pipe 601 that connects the internal high pressure gas pipe 558 and the internal liquid pipe 578 so as to bypass the high pressure gas pipe solenoid valves 204a, 204b, and 204c, and a refrigerant that flows through the bypass pipe 601. A decompressor 603 for decompressing, a refrigerant after passing through the decompressor 603, and the high pressure gas pipe solenoid valves 204a, 204b, 204c, the low pressure gas pipe solenoid valves 206a, 206b, 206c, and the balance pipe solenoid valves 205a, 205b, 205c. And a heat exchanging unit 602 that performs heat exchange between them.

The decompressor 603 is an electric valve whose opening degree can be adjusted, and is controlled by the control unit.
The bypass pipe 601 is a refrigerant pipe that connects the internal high-pressure gas pipe 558 and the internal liquid pipe 578 in the housing 610. The refrigerant flows from the internal high pressure gas pipe 558 to the internal liquid pipe 578 due to a pressure difference between the internal high pressure gas pipe 558 and the internal liquid pipe 578.
One end 582 of the bypass pipe 601 is connected to the internal high-pressure gas pipe 558 upstream of the high-pressure gas pipe solenoid valves 204a, 204b, 204c in the refrigerant flow direction during the heating operation.
The other end 583 of the bypass pipe 601 is connected to the internal liquid pipe 578 in the housing 610.
The decompressor 603 and the heat exchange unit 602 are provided between the one end 582 and the other end 583 in the bypass pipe 601.
One end 582 of the bypass pipe 601 is connected to the lower part (lower face) of the internal high-pressure gas pipe 558, and the other end 583 of the bypass pipe 601 is connected to the lower part (lower face) of the internal liquid pipe 578.

The heat exchanging part 602 is a part where the part on the downstream side of the decompressor 603 and each electromagnetic coil 208 are in contact with each other at the outer peripheral part of the bypass pipe 601, similarly to the heat exchanging part 202 a of the first embodiment.
In the second embodiment, the heat exchanging unit 602 is provided at a position corresponding to each electromagnetic coil 208 between the decompressor 603 and the other end 583 of the bypass pipe 601. Cool 208. That is, the heat exchange unit 602 cools the electromagnetic coils 208 of the high pressure gas pipe solenoid valves 204a, 204b, 204c, the low pressure gas pipe solenoid valves 206a, 206b, 206c and the balance pipe solenoid valves 205a, 205b, 205c.

FIG. 5 shows a refrigerant circuit diagram in the cooling operation.
During the cooling operation, the four-way valve 103 is set so that the refrigerant flows in the direction of the solid line in the four-way valve 103 of FIG. During the cooling operation, the high pressure gas pipe solenoid valves 204a, 204b, and 204c are closed, and the balance pipe solenoid valves 205a, 205b, and 205c and the low pressure gas pipe solenoid valves 206a, 206b, and 206c are opened. The flow direction of the refrigerant during the cooling operation is illustrated by solid and broken arrows in FIG.
The second embodiment differs from the first embodiment in that the internal high-pressure gas pipe 558, the internal low-pressure gas pipe 568 and the internal liquid pipe 578 are accommodated in the collective solenoid valve kit 600, but the bypass pipe Except for the portion 601, the basic flow of the refrigerant is the same as that in the first embodiment, and thus the description of the entire refrigerant flow is omitted.

During the cooling operation, a part of the high-temperature and high-pressure gas refrigerant discharged from the compressor 101 flows not to the four-way valve 103 side but to the outdoor high-pressure gas pipe 550 as shown by a broken arrow in FIG. It flows into the internal high-pressure gas pipe 558 of the valve kit 600.
During the cooling operation, the high-pressure gas pipe solenoid valves 204a, 204b, and 204c are closed, so that the refrigerant that has flowed into the internal high-pressure gas pipe 558 flows into the bypass pipe 601.

The refrigerant that has flowed into the bypass pipe 601 is decompressed by the decompressor 603 and becomes low temperature. The low-temperature refrigerant exchanges heat with each electromagnetic coil 208 when passing through the heat exchanging unit 602, and cools each electromagnetic coil 208.
The refrigerant that has exchanged heat with the heat exchange unit 602 joins the refrigerant flowing through the internal liquid pipe 578 and flows toward the indoor units 300a, 300b, and 300c.

In the second embodiment, the bypass pipe 601 is provided with one bypass pipe 601 straddling the electromagnetic coils 208 of the plurality of refrigerant circuit portions 600a, 600b, and 600c. For this reason, the number of bypass pipes 601 can be reduced, and each electromagnetic coil 208 can be cooled with a simple configuration.
In addition, when the amount of refrigerant accumulated in the high-pressure gas pipe 520 is small, such as immediately after the start of the air conditioner 410, immediately after the oil recovery operation is performed, or when the heating operation or the mixed cooling / heating operation is performed immediately before, the air The harmony device 410 receives the signal from the outdoor unit 100 and fully closes the decompressor 603 for a predetermined time. That is, in the air conditioner 410, when the refrigerant accumulation amount is small during the cooling operation, the refrigerant is controlled so that the refrigerant does not flow into the bypass pipe 601, and the pressure is reduced after the refrigerant starts to accumulate in the high-pressure gas pipe 520 after a predetermined time. The device 603 is controlled in the opening direction.
Thereby, when the refrigerant is not accumulated in the high-pressure gas pipe 520, the refrigerant does not excessively bypass the internal liquid pipe 578 through the bypass pipe 601. For this reason, the fall of the cooling capability by the supercooling degree of the refrigerant | coolant of the exit of the outdoor heat exchanger 104 becoming small can be suppressed.

Further, one end 582 of the bypass pipe 601 is connected to the internal high-pressure gas pipe 558 on the downstream side of the refrigerant flow in the casing 610 (the side far from the outdoor unit 100), and the other end 583 is the refrigerant in the casing 610. Is connected to the internal liquid pipe 578 on the upstream side of the flow (side closer to the outdoor unit 100). Thereby, the refrigerant accumulated in the internal high-pressure gas pipe 558 can be returned to the internal liquid pipe 578 through the bypass pipe 601 over a wide range in the internal high-pressure gas pipe 558, and the refrigerant accumulates in the internal high-pressure gas pipe 558. It is possible to avoid a shortage of refrigerant due to the above, and to suppress a decrease in refrigerant capacity. Furthermore, since the refrigerant shortage can be avoided, the temperature difference of the refrigerant flowing into the indoor units 300a, 300b, 300c can be reduced. For this reason, the variation in the capability of the indoor units 300a, 300b, and 300c can be reduced, and the comfort can be improved by reducing the temperature unevenness in the space in which the indoor units 300a, 300b, and 300c are installed.
In the second embodiment, the same effect as that of the first embodiment can be obtained even during the heating operation and the cooling / heating mixed operation.

The second embodiment shows one aspect to which the present invention is applied, and the present invention is not limited to the second embodiment.
In the second embodiment, the high pressure gas pipe solenoid valves 204a, 204b, and 204c, the balance pipe solenoid valves 205a, 205b, and 205c and the electromagnetic coils 208 of the low pressure gas pipe solenoid valves 206a, 206b, and 206c are heat exchanged. Although an example of cooling by the unit 602 has been described, the present invention is not limited to this, and only a part of the electromagnetic coils 208 may be cooled by the heat exchange unit. For example, in the collective solenoid valve kit 600, since a large number of each electromagnetic coil 208 is arranged in the housing 610, the total amount of heat generated by each electromagnetic coil 208 may increase. The electromagnetic coil surrounded by may increase in temperature. In this case, it is good also as a structure which cools only an electromagnetic coil in which such a temperature rise becomes large easily in a heat exchange part. Alternatively, only the high-pressure gas pipe solenoid valve 204b, the balance pipe solenoid valve 205b, and the low-pressure gas pipe solenoid valve 206b that are disposed in the center of the housing 610 and easily generate heat may be cooled by the heat exchange unit.

10,410 Air conditioner 100 Outdoor unit 300a, 300b, 300c Indoor unit 110, 510 Liquid pipe 120, 520 High pressure gas pipe 130, 530 Low pressure gas pipe 151a, 151b, 151c, 551 In-kit high pressure gas pipe 161a, 161b, 161c , 561 Low pressure gas pipe in the kit 171a, 171b, 171c, 571 Liquid pipe in the kit 182a, 182b, 182c, 582 One end (one end of the refrigerant circuit)
200a, 200b, 200c Solenoid valve kit 201a, 201b, 201c, 601 Bypass pipe 202a, 202b, 202c, 602 Heat exchanger 203a, 203b, 203c, 603 Pressure reducer 204a, 204b, 204c High pressure gas pipe solenoid valve (solenoid valve)
206a, 206b, 206c Low pressure gas pipe solenoid valve (solenoid valve)
208 Electromagnetic coil 350a, 350b, 350c Indoor unit side liquid pipe 351a, 351b, 351c Gas pipe 600 Collective solenoid valve kit (solenoid valve kit)

Claims (4)

An outdoor unit, a plurality of indoor units, and a high-pressure gas pipe, a liquid pipe, and a low-pressure gas pipe that connect the outdoor unit to the plurality of indoor units. An electromagnetic valve is provided that communicates with the low-pressure gas pipe and is switched to communicate the high-pressure gas pipe with the indoor unit during heating operation, and at least one of the indoor units is either cooled or heated. On the other hand, in an air conditioner that can be operated and can operate a plurality of the indoor units mixed with cooling and heating,
A pressure reducer for reducing the pressure of the refrigerant in the high-pressure gas pipe and flowing it through the liquid pipe; and a heat exchanging section for exchanging heat between the refrigerant after passing through the pressure reducer and the electromagnetic coil of the solenoid valve. Air conditioner. A solenoid valve kit connected between the outdoor unit and the plurality of indoor units;
The solenoid valve kit is connected to the outdoor unit with the high pressure gas pipe, the liquid pipe, and the low pressure gas pipe, and is connected to the indoor unit with an indoor unit side liquid pipe and a gas pipe,
The high-pressure gas pipe includes an in-kit high-pressure gas pipe disposed in the solenoid valve kit,
The liquid pipe includes a liquid pipe in the kit arranged in the solenoid valve kit,
The low-pressure gas pipe includes an in-kit low-pressure gas pipe disposed in the solenoid valve kit,
The solenoid valve is switched so that the gas pipe communicates with the low-pressure gas pipe in the kit during cooling operation, and communicates between the high-pressure gas pipe within the kit and the gas pipe during heating operation,
2. The refrigerant circuit that connects the high-pressure gas pipe and the liquid pipe via the decompressor is a bypass pipe that connects the high-pressure gas pipe in the kit and the liquid pipe in the kit. The air conditioning apparatus described.   3. The air conditioner according to claim 1, wherein one end of a refrigerant circuit that connects the high-pressure gas pipe and the liquid pipe via the decompressor is connected to a lower portion of the high-pressure gas pipe. . A high-pressure gas pipe;
A low pressure gas pipe;
A liquid tube,
A gas pipe connected to the indoor unit, communicated with the low-pressure gas pipe during cooling operation, and switched to communicate with the high-pressure gas pipe during heating operation;
A decompressor that decompresses the refrigerant in the high-pressure gas pipe and flows the refrigerant into the liquid pipe;
A heat exchanging unit that exchanges heat between the refrigerant after passing through the pressure reducer and the electromagnetic coil of the electromagnetic valve;
A solenoid valve kit comprising:

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