JP2015075211A - Flow passage selector valve and refrigerant circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow passage selector valve and a refrigerant circuit which can reduce heat loss with a simple construction.SOLUTION: A flow passage selector valve includes a low pressure three-way selection part which switches a flow passage of low pressure refrigerant by a low pressure valve body 21 and a low pressure valve seat 22, and a high pressure three-way selection part which switches a flow passage of high pressure refrigerant by a high pressure valve body 11 and a high pressure valve seat 12. The low pressure three-way selection part and the high pressure three-way selection part are located away from each other in a single cylinder 1.

Description

  The present invention relates to a flow path switching valve and a refrigerant circuit, and more particularly to a flow path switching valve that switches a flow path of a high-pressure refrigerant and a flow path of a low-pressure refrigerant, and a refrigerant circuit that uses the flow path switching valve.

  As a conventional flow path switching valve, there is a four-way switching valve that reduces heat loss by increasing the heat insulation between the high-pressure refrigerant side and the low-pressure refrigerant side by using a synthetic resin valve body (for example, JP-A-7-151251 (Patent Document 1)).

  However, the four-way switching valve has a problem that the synthetic resin valve element cannot be thickened due to dimensional restrictions, and the heat insulation effect is low.

  Therefore, as a conventional second flow path switching valve, there is a four-way switching valve that separates the high-pressure refrigerant side and the low-pressure refrigerant side using two three-way valves and reduces heat conduction from the high-pressure refrigerant side to the low-pressure refrigerant side. (For example, refer to JP2012-202588A (Patent Document 1)).

Japanese Patent Laid-Open No. 7-151251 JP 2012-202588 A

  However, the four-way switching valve using the two three-way valves has a problem that the structure is complicated and the size is increased, and the cost is increased. Further, even if the four-way switching valve having such a configuration is driven by one pilot solenoid valve, a deviation occurs in the switching operation of the two three-way valves.

  An object of the present invention is to provide a flow path switching valve and a refrigerant circuit that can reduce heat loss with a simple configuration.

In order to solve the above problems, the flow path switching valve of the present invention is:
A low-pressure three-way switching unit that switches a flow path of the low-pressure refrigerant between the low-pressure valve body and the low-pressure valve seat;
A high-pressure three-way switching unit that switches the flow path of the high-pressure refrigerant between the high-pressure valve body and the high-pressure valve seat,
The low-pressure three-way switching part and the high-pressure three-way switching part are arranged in the same main body so as to be separated from each other.

  According to the above configuration, the low pressure three-way switching unit that switches the flow path of the low pressure refrigerant between the low pressure valve body and the low pressure valve seat, and the high pressure that switches the flow path of the high pressure refrigerant between the high pressure valve body and the high pressure valve seat. By disposing the three-way switching unit in the same main body apart from each other, the flow of the low-pressure refrigerant and the high-pressure refrigerant in the main body are separated from each other, so that heat from the high-pressure refrigerant side to the low-pressure refrigerant side can be obtained with a simple configuration. Conduction can be suppressed and heat loss can be reduced.

Moreover, in the flow path switching valve of one embodiment,
There is provided a connecting portion for connecting the low pressure valve body of the low pressure three-way switching portion and the high pressure valve body of the high pressure three-way switching portion so as to be interlocked with each other.

  According to the above embodiment, the low pressure three-way switching portion and the high pressure three-way switching portion are connected to the high pressure valve body of the high pressure three-way switching portion by the connecting portion so as to be interlocked with each other. There is no deviation in the switching operation of the switching unit.

Moreover, in the flow path switching valve of one embodiment,
The low-pressure valve seat of the low-pressure three-way switching unit and the high-pressure valve seat of the high-pressure three-way switching unit are separate.

  According to the above embodiment, by separating the low pressure valve seat of the low pressure three-way switching portion and the high pressure valve seat of the high pressure three-way switching portion, between the low pressure valve seat and the high pressure valve seat. Heat conduction can be reduced, and heat loss can be further reduced.

Moreover, in the flow path switching valve of one embodiment,
The high-pressure three-way switching unit is formed with a guide channel for guiding the high-pressure refrigerant.

  According to the above embodiment, by forming the guide flow path for guiding the high-pressure refrigerant in the high-pressure three-way switching unit, a path through which the high-pressure refrigerant flows can be prevented from being formed on the low-pressure three-way switching unit side in the main body. Since the flow of the low-pressure refrigerant and the flow of the high-pressure refrigerant can be reliably separated from each other, heat conduction from the high-pressure refrigerant side to the low-pressure refrigerant side can be suppressed, and heat loss can be further reduced.

Moreover, in the flow path switching valve of one embodiment,
A partition portion provided in the main body and between the low-pressure three-way switching portion and the high-pressure three-way switching portion is provided.

  According to the above embodiment, by providing the partition portion in the main body and between the low pressure three-way switching portion and the high pressure three-way switching portion, the flow of the low-pressure refrigerant and the flow of the high-pressure refrigerant in the main body is ensured by the partition portion. Since they can be isolated, heat conduction from the high-pressure refrigerant side to the low-pressure refrigerant side can be effectively suppressed, and heat loss can be further reduced.

  Note that the partition is not a complete partition between the low-pressure three-way switching unit and the high-pressure three-way switching unit, and there is a gap to the extent that the main flow of high-pressure refrigerant is not formed on the low-pressure three-way switching unit side. Also good.

The refrigerant circuit of the present invention is
Including any one of the flow path switching valves described above,
At least the compressor, the high-pressure three-way switching portion of the flow path switching valve, the condenser, the pressure reducing mechanism, the evaporator, and the low-pressure three-way switching portion of the flow path switching valve are connected in an annular shape. It is characterized by.

  According to the above configuration, at least the compressor, the high-pressure three-way switching portion of the flow path switching valve, the condenser, the pressure reducing mechanism, the evaporator, and the low-pressure three-way switching portion of the flow path switching valve are connected in an annular shape. With the configuration, heat loss in the flow path switching valve can be reduced, and the efficiency of the refrigeration cycle can be improved.

In the refrigerant circuit of one embodiment,
The high-pressure three-way switching unit has a high-pressure inlet port to which the discharge side of the compressor is connected, a first high-pressure outlet port and a second high-pressure outlet port provided in the high-pressure valve seat,
The high pressure valve element connects one of the first and second high pressure outlet ports to the high pressure inlet port and closes the other of the first and second high pressure outlet ports.

  According to the above embodiment, one of the first and second high-pressure outlet ports provided in the high-pressure valve seat is communicated with the high-pressure inlet port to which the discharge side of the compressor is connected. Since the other of the high-pressure outlet ports is closed, one of the first and second high-pressure outlet ports is connected to the high-pressure side condenser, and the other is connected to the low-pressure side evaporator. Cycle switching is possible. In this case, since the other of the first and second high-pressure outlet ports is connected to the low-pressure side evaporator, the low-pressure refrigerant flow is not formed in the high-pressure three-way switching portion. Loss can be reduced.

In the refrigerant circuit of one embodiment,
The low-pressure three-way switching unit has a low-pressure outlet port connected to the suction side of the compressor, a first low-pressure inlet port and a second low-pressure inlet port provided in the low-pressure valve seat,
The low pressure valve element allows one of the first and second low pressure inlet ports to communicate with the low pressure outlet port and closes the other of the first and second low pressure inlet ports.

  According to the above embodiment, one of the first and second low pressure inlet ports provided in the low pressure valve seat is communicated with the low pressure outlet port to which the suction side of the compressor is connected. Since the other of the low-pressure inlet ports is closed, one of the first and second low-pressure inlet ports is connected to the low-pressure side evaporator, and the other is connected to the high-pressure side condenser. Cycle switching is possible. In this case, since the other of the first and second low-pressure inlet ports is connected to the high-pressure side condenser, the high-pressure refrigerant flow is not formed in the low-pressure three-way switching portion. Loss can be reduced.

  As apparent from the above, according to the present invention, it is possible to realize a flow path switching valve that can reduce heat loss with a simple configuration and a refrigerant circuit that uses the flow path switching valve.

FIG. 1 is a circuit diagram at the time of cooling operation of an air conditioner provided with a refrigerant circuit using a pilot-type flow path switching valve according to a first embodiment of the present invention. FIG. 2 is a circuit diagram of the air conditioner during heating operation. FIG. 3 is a circuit diagram at the time of cooling operation of an air conditioner provided with a refrigerant circuit using the flow path switching valve of the second embodiment of the present invention. FIG. 4 is a sectional view of the flow path switching valve. FIG. 5 is a circuit diagram at the time of cooling operation of an air conditioner provided with a refrigerant circuit using the flow path switching valve of the third embodiment of the present invention. FIG. 6 is a circuit diagram at the time of cooling operation of an air conditioner provided with a refrigerant circuit using the flow path switching valve of the fourth embodiment of the present invention.

  Hereinafter, the flow path switching valve of the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 shows a circuit diagram at the time of cooling operation of an air conditioner provided with a refrigerant circuit using a pilot-type flow path switching valve 110 according to the first embodiment of the present invention. In FIG. 1, the flow path switching valve 110 shows a cross section.

  As shown in FIG. 1, the flow path switching valve 110 includes a metal high-pressure valve seat 12 and a metal low-pressure valve seat 22 in a cylinder 1 as an example of a main body. Arranged at intervals in the direction. A high pressure valve element 11 and a low pressure valve element 21 are slidably disposed in the cylinder 1 in the axial direction of the cylinder 1. The high-pressure valve body 11 and the low-pressure valve body 21 are made of synthetic resin and are connected by a metal plate-like connecting portion 6.

  The connecting portion 6 extends on both sides of the high pressure valve body 11 and the low pressure valve body 21 in the sliding direction, and fixes the piston 4 to one end of the connecting portion 6 while fixing the piston 5 to the other end of the connecting portion 6. Yes. Both ends of the cylinder 1 are closed with caps 2 and 3.

  On the side of the cylinder 1 facing the high-pressure valve seat 12, a high-pressure inlet port P11 is provided, and a first high-pressure outlet port P12 and a second high-pressure outlet port P13 penetrating the high-pressure valve seat 12 are provided. ing.

  Further, on the low pressure valve seat 22 side of the cylinder 1, a low pressure outlet port P21, a first low pressure inlet port P22 and a second low pressure inlet port P23 penetrating the low pressure valve seat 22 are provided.

  The high pressure valve body 11, the high pressure valve seat 12, the high pressure inlet port P11, the first high pressure outlet port P12, and the second high pressure outlet port P13 constitute a high pressure three-way switching portion. The low-pressure valve body 21, the low-pressure valve seat 22, the low-pressure outlet port P21, the first low-pressure inlet port P22, and the second low-pressure inlet port P23 constitute a low-pressure three-way switching unit.

  A port P31 communicating with the piping connected to the high pressure inlet port P11 and a port P32 communicating with the piping connected to the low pressure outlet port P21 are respectively connected to the pilot solenoid valve 7 and provided at both ends of the cylinder 1. The ports P41 and P42 are connected to the pilot solenoid valve 7, respectively.

  In the refrigerant circuit of the air conditioner of this embodiment, the discharge side of the compressor 101 is connected to the high pressure inlet port P11 of the flow path switching valve 110, and the first high pressure outlet port P12 of the flow path switching valve 110, The second low-pressure inlet port P23 is connected to one end of the outdoor heat exchanger 103. The other end of the outdoor heat exchanger 103 is connected to one end of an electric expansion valve 104 as an example of an expansion mechanism, and the other end of the electric expansion valve 104 is connected to one end of the indoor heat exchanger 105. Further, the other end of the indoor heat exchanger 105 is connected to the second high pressure outlet port P13 and the first low pressure inlet port P22 of the flow path switching valve 110, and the low pressure outlet port P21 of the flow path switching valve 110 is connected to the compressor. 101 is connected to the suction side.

  FIG. 1 shows a state in which the coil of the pilot solenoid valve 7 is not excited. A port P31 communicating with the high pressure inlet port P11 and a port P41 provided in the cylinder 1 communicate with each other and communicate with a low pressure outlet port P21. The port P32 and the port P42 of the cylinder 1 communicate with each other, and the pressure in the space (P41 side) between the cap 3 and the piston 5 becomes higher than the pressure in the space (P42 side) between the cap 2 and the piston 4. . Due to this pressure difference, the connecting portion 6 to which the pistons 4 and 5 are attached moves to the left in the figure together with the high pressure valve body 11 and the low pressure valve body 21, so that the high pressure valve body 11 is the first high pressure valve body. The outlet port P12 is communicated with the high pressure inlet port P11, while the second high pressure outlet port P13 is closed. At the same time, the low pressure valve element 21 connects the low pressure outlet port P21 and the first low pressure inlet port P22, and closes the second low pressure inlet port P23.

  Further, when the coil of the pilot solenoid valve 7 is excited, the port P31 communicating with the high pressure inlet port P11 and the port P42 provided in the cylinder 1 communicate with each other, and the port P32 communicating with the low pressure outlet port P21 and the cylinder 1 are communicated. The port P41 communicates, and the pressure in the space between the cap 2 and the piston 4 (P42 side) becomes higher than the pressure in the space between the cap 3 and the piston 5 (P41 side). Due to this pressure difference, the connecting portion 6 to which the pistons 4 and 5 are attached moves to the right in the drawing together with the high pressure valve body 11 and the low pressure valve body 21, as shown in FIG. 11 connects the high-pressure inlet port P11 to the second high-pressure outlet port P13, while closing the first high-pressure outlet port P12. At the same time, the low pressure valve element 21 connects the low pressure outlet port P21 and the second low pressure inlet port P23, and closes the first low pressure inlet port P22.

  In the air conditioner including the refrigerant circuit having the above-described configuration, the high-temperature and high-pressure refrigerant discharged from the compressor 101 with the flow path switching valve 110 in the state shown in FIG. Flows into the outdoor heat exchanger 103 via the first high-pressure outlet port P12. Then, after the high-temperature and high-pressure refrigerant is condensed in the outdoor heat exchanger 103 as a condenser, the low-pressure refrigerant decompressed by the electric expansion valve 104 is evaporated in the indoor heat exchanger 105 as an evaporator. The low-pressure refrigerant evaporated in the indoor heat exchanger 105 is guided from the first low-pressure inlet port P22 of the flow path switching valve 110 to the bowl-shaped low-pressure valve body 21 in the cylinder 1 through the low-pressure outlet port P21. Return to the suction side of the compressor 101. Thereby, the indoor air is cooled by heat exchange in the indoor heat exchanger 105, and the cooling operation is performed.

  On the other hand, during heating operation, when the flow path switching valve 110 starts the compressor 101 with the state shown in FIG. 2, the high-temperature and high-pressure refrigerant discharged from the compressor 101 is transferred from the high-pressure inlet port P11 of the flow path switching valve 110 to the cylinder. 1 flows into the indoor heat exchanger 105 through the second high-pressure outlet port P13. Here, the connection part 6 is provided with a hole (not shown) so as not to disturb the flow of the high-pressure refrigerant. Then, after the high-temperature and high-pressure refrigerant is condensed in the indoor heat exchanger 105 as a condenser, the low-pressure refrigerant decompressed by the electric expansion valve 104 evaporates in the outdoor heat exchanger 103 as an evaporator. The low-pressure refrigerant evaporated in the outdoor heat exchanger 103 is guided from the second low-pressure inlet port P23 of the flow path switching valve 110 to the bowl-shaped low-pressure valve body 21 in the cylinder 1 through the low-pressure outlet port P21. Return to the suction side of the compressor 101. Thereby, indoor air is warmed by the heat exchange in the indoor heat exchanger 105, and heating operation is performed.

  In the flow path switching valve 110, the main flow path of the high-pressure refrigerant from the high-pressure inlet port P11 to the first high-pressure outlet port P12 (or the second high-pressure outlet port P13) in the cylinder 1 is 1 is isolated from the main flow path of the low-pressure refrigerant from the low-pressure inlet port P22 (second low-pressure inlet port P23) to the low-pressure outlet port P21. The high-pressure refrigerant flowing into the cylinder 1 from the high-pressure inlet port P11 is filled in the space between the pistons 4 and 5 in the cylinder 301, and the difference between this space and the low-pressure refrigerant guided by the low-pressure valve body 21. Due to the pressure, the low pressure valve body 21 is biased toward the low pressure valve seat 22 side, and the sealing performance between the low pressure valve body 21 and the low pressure valve seat 22 is improved.

  According to the flow path switching valve 110 configured as described above, the low pressure three-way switching portion that switches the flow path of the low pressure refrigerant between the low pressure valve body 21 and the low pressure valve seat 22, the high pressure valve body 11, and the high pressure valve seat 12. By arranging the high-pressure three-way switching portion for switching the flow path of the high-pressure refrigerant apart from each other in the same cylinder 1, the flow of the low-pressure refrigerant and the flow of the high-pressure refrigerant in the cylinder 1 are separated. With the configuration, heat conduction from the high-pressure refrigerant side to the low-pressure refrigerant side can be suppressed, and heat loss can be reduced.

  Further, the low pressure valve body 21 of the low pressure three-way switching section and the high pressure valve body 11 of the high pressure three-way switching section are connected to each other by the connecting section 6 so that the low pressure three-way switching section and the high pressure three-way switching section are connected. There is no deviation in the switching operation of the parts.

  Further, by separating the low-pressure valve seat 22 of the low-pressure three-way switching unit and the high-pressure valve seat 12 of the high-pressure three-way switching unit, the low-pressure valve seat 22 and the high-pressure valve seat 12 are separated from each other. Heat conduction can be reduced, and heat loss can be further reduced.

  Further, according to the refrigerant circuit having the above-described configuration, the compressor 101, the high-pressure three-way switching portion of the flow path switching valve 110, the evaporator, the pressure reducing mechanism, the evaporator, and the low-pressure three-way of the flow path switching valve 110 With the configuration in which the switching unit is connected in a ring shape, heat loss in the flow path switching valve 110 can be reduced, and the efficiency of the refrigeration cycle can be improved.

  One of the first and second high-pressure outlet ports P12 and P13 provided in the high-pressure valve seat 12 is communicated with a high-pressure inlet port P11 to which the discharge side of the compressor 101 is connected. Since the other of the second high-pressure outlet ports P12 and P13 is closed, one of the first and second high-pressure outlet ports P12 and P13 is connected to the high-pressure side condenser and the other is connected to the low-pressure side evaporation. The refrigeration cycle can be switched by connecting to the vessel. In this case, since the other of the first and second high-pressure outlet ports P12 and P13 is connected to the low-pressure side evaporator, it is closed, so that a low-pressure refrigerant flow is formed in the high-pressure three-way switching portion. Therefore, heat loss can be reduced.

  One of the first and second low-pressure inlet ports P22 and P23 provided in the low-pressure valve seat 22 is communicated with a low-pressure outlet port P21 to which the suction side of the compressor 101 is connected. Since the other of the second low-pressure inlet ports P22 and P23 is closed, one of the first and second low-pressure inlet ports P22 and P23 is connected to the low-pressure side evaporator and the other is connected to the high-pressure side condensation. The refrigeration cycle can be switched by connecting to the vessel. In this case, since the other of the first and second low pressure inlet ports P22 and P23 is connected to the high pressure side condenser, it is closed, so that a flow of high pressure refrigerant is formed in the low pressure three-way switching portion. Therefore, heat loss can be reduced.

[Second Embodiment]
FIG. 3 shows a circuit diagram of the air conditioner provided with the refrigerant circuit using the flow path switching valve 210 according to the second embodiment of the present invention during the cooling operation. In FIG. 3, the flow path switching valve 210 shows a cross section. The refrigerant circuit using the flow path switching valve 210 of the second embodiment is a refrigerant circuit using the flow path switching valve 110 of the first embodiment except for the cylinder 201, the high pressure valve body 211, and the valve seat 212. The same components are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 3, the flow path switching valve 210 includes a metal valve seat 212 that functions as a high-pressure valve seat and a low-pressure valve seat in a cylindrical cylinder 201 as an example of a main body. ing. Further, a high pressure valve body 211 and a low pressure valve body 21 are slidably disposed in the cylinder 201 in the axial direction of the cylinder 201. The high-pressure valve body 211 and the low-pressure valve body 21 are made of synthetic resin and are connected by a metal plate-like connecting portion 206. The valve seat 212 is provided with an intermediate portion 212c having a sliding surface shared by the high pressure valve body 211 and the low pressure valve body 21 between the high pressure valve seat portion 212a and the low pressure valve seat portion 212b. Yes.

  The connecting portion 206 extends to both sides of the high pressure valve body 211 and the low pressure valve body 21 in the sliding direction, and fixes the piston 4 to one end of the connecting portion 206 while fixing the piston 5 to the other end of the connecting portion 206. Yes. Both ends of the cylinder 201 are closed with caps 2 and 3.

  The cylinder 201 has a first high pressure outlet port P12, a second high pressure outlet port P13, a low pressure outlet port P21, a first low pressure inlet port P22, and a second low pressure inlet port P23 that pass through the valve seat 212. Provided.

  The high pressure valve body 211, the high pressure valve seat 212a of the valve seat 212, the high pressure inlet port P11, the first high pressure outlet port P12, and the second high pressure outlet port P13 constitute a high pressure three-way switching portion. . The low pressure valve body 21, the low pressure valve seat 212b of the valve seat 212, the low pressure outlet port P21, the first low pressure inlet port P22 and the second low pressure inlet port P23 constitute a low pressure three-way switching portion. Yes.

  The high-pressure valve body 211 has a guide passage P1 for guiding the high-pressure refrigerant flowing from the high-pressure inlet port P11 to the first high-pressure outlet port P12, and the high-pressure refrigerant flowing from the high-pressure inlet port P11 is the second high-pressure refrigerant. A guide channel P2 for guiding to the outlet port P13 is formed.

  The flow path switching valve 210 of the second embodiment and the refrigerant circuit using the flow path switching valve 210 are the same as the flow path switching valve 110 of the first embodiment and the refrigerant circuit using the flow path switching valve 110. Has an effect.

  Further, by forming the guide flow paths P1 and P2 for guiding the high-pressure refrigerant in the high-pressure three-way switching portion, a path through which the high-pressure refrigerant flows in the low-pressure three-way switching portion in the cylinder 201 can be prevented. Since the flow of the low-pressure refrigerant and the flow of the high-pressure refrigerant in 201 can be reliably separated, heat conduction from the high-pressure refrigerant side to the low-pressure refrigerant side can be suppressed, and heat loss can be further reduced.

As shown in FIG. 4, the flow path switching valve 210 has a distance x between the second high pressure outlet port P13 and the second low pressure inlet port P23, and the first and second high pressure outlet ports P12, P13. , A distance between the low pressure outlet port P21 and the second low pressure inlet port P23, b, and a distance between the low pressure outlet port P21 and the first low pressure inlet port P22 as c. Then
x> a and x> b and x> c
Satisfy the condition of Thereby, in the same cylinder 1, the dimension in the longitudinal direction of the flow path switching valve 210 can be made compact while the low pressure three-way switching portion and the high pressure three-way switching portion are reliably separated. The above conditions are the same for the flow path switching valve 110 of the first embodiment.

  Here, the distance x between the second high-pressure outlet port P13 and the second low-pressure inlet port P23 is such that the low-pressure refrigerant flow path in the low-pressure three-way switching section and the high-pressure refrigerant flow path in the high-pressure three-way switching section are Is the shortest distance.

  In the flow path switching valve 210 of the second embodiment, the guide flow paths P1 and P2 are formed in the high pressure valve body 211, but a guide flow path fixed to a cylinder may be provided.

[Third Embodiment]
FIG. 5 shows a circuit diagram at the time of cooling operation of an air conditioner provided with a refrigerant circuit using the flow path switching valve 310 of the third embodiment of the present invention. In FIG. 5, the flow path switching valve 310 shows a cross section. The refrigerant circuit using the flow path switching valve 310 of the third embodiment is the same as the refrigerant circuit using the flow path switching valve 110 of the first embodiment, except for the cylinder 301, the connecting portion 306, and the partition portion 307. The same reference numerals are assigned to the same components.

  As shown in FIG. 5, the flow path switching valve 310 is configured such that a high pressure valve seat 12 and a low pressure valve seat 22 are arranged at a predetermined interval in the axial direction of the cylinder 301 in a cylindrical cylinder 301 as an example of a main body. Open and arranged. Further, the high pressure valve element 11 and the low pressure valve element 21 are slidably disposed in the cylinder 301 in the axial direction of the cylinder 301. The high-pressure valve body 11 and the low-pressure valve body 21 are connected by a metal plate-like connecting portion 306.

  The connecting portion 306 extends to both sides of the high pressure valve body 11 and the low pressure valve body 21 in the sliding direction, and fixes the piston 4 to one end of the connecting portion 306, and fixes the piston 5 to the other end of the connecting portion 306. Yes. Both ends of the cylinder 301 are closed with caps 2 and 3.

  The high pressure valve body 11, the high pressure valve seat 12, the high pressure inlet port P11, the first high pressure outlet port P12, and the second high pressure outlet port P13 constitute a high pressure three-way switching portion. The low-pressure valve body 21, the low-pressure valve seat 22, the low-pressure outlet port P21, the first low-pressure inlet port P22, and the second low-pressure inlet port P23 constitute a low-pressure three-way switching unit.

  A partition portion 307 having a shape similar to that of the piston 4 is fixed to the connecting portion 306 between the high pressure valve body 11 and the low pressure valve body 21 in the cylinder 301. The partition portion 307 has a seal surface that seals between the inner peripheral surface of the cylinder 301 on the outer periphery, but completely seals the high-pressure three-way switching portion side and the low-pressure three-way switching portion side. Instead, the high-pressure refrigerant flows from the high-pressure three-way switching unit side into the low-pressure three-way switching unit side to fill the space on the low-pressure three-way switching unit side of the cylinder 301, and the high-pressure refrigerant and the low-pressure valve body 21 in this space The low pressure valve body 21 is biased toward the low pressure valve seat 22 by the differential pressure with the low pressure refrigerant to be guided, and the sealing performance between the low pressure valve body 21 and the low pressure valve seat 22 is improved. Further, the partition 307 communicates the high pressure three-way switching portion side and the low pressure three-way switching portion side in the cylinder 301, and a path through which high-pressure refrigerant flows is not formed on the low pressure three-way switching portion side in the cylinder 301. A through hole having a size may be provided.

  The flow path switching valve 310 of the third embodiment and the refrigerant circuit using the flow path switching valve 310 are the same as the flow path switching valve 110 of the first embodiment and the refrigerant circuit using the flow path switching valve 110. Has an effect.

  Further, by providing a partition 307 in the cylinder 1 and between the low pressure three-way switching unit and the high pressure three-way switching unit, the flow of the low-pressure refrigerant and the flow of high-pressure refrigerant in the cylinder 301 can be ensured by the partition unit 307. Since they can be isolated, heat conduction from the high-pressure refrigerant side to the low-pressure refrigerant side can be effectively suppressed, and heat loss can be further reduced.

[Fourth Embodiment]
FIG. 6: has shown the circuit diagram at the time of the cooling operation of the air conditioner provided with the refrigerant circuit using the flow-path switching valve 410 of 4th Embodiment of this invention. In FIG. 6, the flow path switching valve 410 shows a cross section. The refrigerant circuit using the flow path switching valve 410 according to the fourth embodiment has the same configuration as the refrigerant circuit using the flow path switching valve 310 according to the third embodiment, except for the partition 407. The same reference numerals are assigned to the same components.

  As shown in FIG. 6, in the flow path switching valve 410, a high pressure valve seat 12 and a low pressure valve seat 22 are arranged at a predetermined interval in a cylindrical cylinder 301 as an example of a main body. . Further, the high pressure valve body 11 and the low pressure valve body 21 are slidably disposed in the cylinder 301 in the axial direction of the cylinder 201. The high-pressure valve body 11 and the low-pressure valve body 21 are connected by a plate-like connecting portion 306.

  The connecting portion 306 extends to both sides of the high pressure valve body 11 and the low pressure valve body 21 in the sliding direction, and fixes the piston 4 to one end of the connecting portion 306, and fixes the piston 5 to the other end of the connecting portion 306. Yes. Both ends of the cylinder 301 are closed with caps 2 and 3.

  The high pressure valve body 11, the high pressure valve seat 12, the high pressure inlet port P11, the first high pressure outlet port P12, and the second high pressure outlet port P13 constitute a high pressure three-way switching portion. The low-pressure valve body 21, the low-pressure valve seat 22, the low-pressure outlet port P21, the first low-pressure inlet port P22, and the second low-pressure inlet port P23 constitute a low-pressure three-way switching unit.

  A partition portion 407 made of synthetic resin is disposed between the high pressure valve body 11 and the low pressure valve body 21 in the cylinder 301, and the partition portion 407 is fixed to the connecting portion 306. The partition 407 may be fixed to the cylinder 301 without being fixed to the connecting portion 306. The partition 407 is completely connected between the high-pressure three-way switching portion side and the low-pressure three-way switching portion side. The high-pressure refrigerant flows from the high-pressure three-way switching unit side into the low-pressure three-way switching unit side to fill the space on the low-pressure three-way switching unit side of the cylinder 301, and the high-pressure refrigerant and the low-pressure valve body in this space are not sealed. The low-pressure valve body 21 is biased toward the low-pressure valve seat 22 by the differential pressure with the low-pressure refrigerant guided by 21, and the sealing performance between the low-pressure valve body 21 and the low-pressure valve seat 22 is improved. . Also, a through hole having a size that allows communication between the high-pressure three-way switching portion side and the low-pressure three-way switching portion side in the cylinder 301 and does not form a path through which the high-pressure refrigerant flows on the low-pressure three-way switching portion side in the cylinder 301. A hole may be provided in the partition portion 407.

  The flow path switching valve 410 of the fourth embodiment and the refrigerant circuit using the flow path switching valve 410 are the same as the flow path switching valve 110 of the third embodiment and the refrigerant circuit using the flow path switching valve 110. Has an effect.

  In the first to fourth embodiments, the air conditioner including the refrigerant circuit has been described. However, the refrigerant circuit of the present invention may be applied to an apparatus having another configuration.

  Further, in the first to fourth embodiments, the low pressure three-way switching portion including the low pressure valve body 21 and the low pressure valve seat 22 (212b), the high pressure valve body 11 (211), and the high pressure valve seat 12 are provided. Although the flow path switching valve 110 (210, 310, 410) including the high-pressure three-way switching unit configured in (212a) has been described, the configurations of the low-pressure three-way switching unit and the high-pressure three-way switching unit are not limited thereto. .

  In the first to fourth embodiments, the low pressure valve body 21 and the high pressure valve body 11 (211) are connected by the connecting portion 6 (206, 306). However, the low pressure valve integrally formed of resin is used. The body and the valve body for high pressure may be connected by a connecting portion.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first to fourth embodiments, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Cylinder 2, 3 ... Cap 4, 5 ... Piston 6 ... Connection part 7 ... Pilot solenoid valve 11 ... High pressure valve body 12 ... High pressure valve seat 21 ... Low pressure valve body 22 ... Low pressure valve seat 101 ... Compressor DESCRIPTION OF SYMBOLS 103 ... Outdoor heat exchanger 104 ... Electric expansion valve 105 ... Indoor heat exchanger 110 ... Channel switching valve 201 ... Cylinder 206 ... Connection part 210 ... Channel switching valve 211 ... Valve body 212 for high pressure 212 ... Valve seat 212a ... For high pressure Valve seat part 212b ... Low pressure valve seat part 212c ... Intermediate part 301 ... Cylinder 307 ... Partition part 306 ... Connecting part 310 ... Channel switching valve 407 ... Partitioning part 410 ... Channel switching valve P11 ... High pressure inlet port P12 ... No. 1 High-pressure outlet port P13 ... Second high-pressure outlet port P21 ... Low-pressure outlet port P22 ... First low-pressure inlet port P23 ... Second low-pressure inlet port P31, P32 ... Ports P41, P 2 ... port

Claims (8)

A low-pressure three-way switching portion that switches the flow path of the low-pressure refrigerant between the low-pressure valve body (21) and the low-pressure valve seat (22, 212b);
A high-pressure three-way switching portion that switches the flow path of the high-pressure refrigerant between the high-pressure valve body (11, 211) and the high-pressure valve seat (12, 212a);
The flow path switching valve, characterized in that the low-pressure three-way switching portion and the high-pressure three-way switching portion are spaced apart from each other in the same main body (1). In the flow path switching valve according to claim 1,
A connecting portion (6,306) for connecting the low-pressure valve body (21) of the low-pressure three-way switching portion and the high-pressure valve body (11,211) of the high-pressure three-way switching portion is provided. A flow path switching valve. In the flow path switching valve according to claim 1 or 2,
The flow path switching valve, wherein the low pressure valve seat (22) of the low pressure three-way switching section and the high pressure valve seat (12) of the high pressure three-way switching section are separate. In the flow path switching valve according to any one of claims 1 to 3,
The flow path switching valve, wherein the high pressure three-way switching portion is formed with guide flow paths (P1, P2) for guiding the high pressure refrigerant. In the flow path switching valve according to any one of claims 1 to 4,
A flow path switching valve comprising partition portions (307, 407) provided in the main body (1) and between the low pressure three-way switching portion and the high pressure three-way switching portion. The flow path switching valve according to any one of claims 1 to 5,
At least the compressor (101), the three-way switching unit for high pressure of the flow path switching valve (110, 210, 310, 410), the condenser (103), the pressure reducing mechanism (104), and the evaporator (105) And a low-pressure three-way switching portion of the flow path switching valve (110, 210, 310, 410) is connected in a ring shape. The flow path switching valve according to claim 6,
The high-pressure three-way switching unit includes a high-pressure inlet port (P11) connected to the discharge side of the compressor (101) and a first high-pressure outlet port (12, 212a) provided on the high-pressure valve seat (12, 212a). P12) and a second high pressure outlet port (P13),
The high-pressure valve body (11, 211) communicates one of the first and second high-pressure outlet ports (P12, P13) to the high-pressure inlet port (P11), and A refrigerant circuit characterized in that the other of the high-pressure outlet ports (P12, P13) is closed. In the flow path switching valve according to claim 6 or 7,
The low-pressure three-way switching unit includes a low-pressure outlet port (P21) connected to the suction side of the compressor (101) and a first low-pressure inlet port (22, 212b) provided in the low-pressure valve seat (22, 212b). P22) and a second low pressure inlet port (P23),
The low-pressure valve element (21) communicates one of the first and second low-pressure inlet ports (P22, P23) to the low-pressure outlet port (P21), and the first and second low-pressure valve ports (21). A refrigerant circuit characterized in that the other of the inlet ports (P22, P23) is closed.

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