JP2017150645A - Six-way switching valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a six-way switching valve that can effectively inhibits pressure loss as well as wear of a sliding part, improve durability, is less likely to cause valve leakage, and suppress operational differential pressure for moving a main valve element as much as possible.SOLUTION: In each flow passage switching valve, a poppet type main valve elements 15, 25 are moved in synchronization with each other in main valve chambers 14, 24 defined by cylindrical main valve housing 11, 21; thus, communication between ports can be switched (total six communication states provided between ports for two flow passages switching valves).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a six-way switching valve configured by combining a plurality of flow path switching valves (three-way switching valves) that switch a flow path by moving a valve body, and in particular, switching a flow path in a heat pump air conditioning system or the like. The present invention relates to a six-way switching valve suitable for use as a flow path switching valve.

  Generally, a heat pump type air conditioning system such as a room air conditioner or a car air conditioner has a flow path switching valve as a flow path (flow direction) switching means in addition to a compressor, an outdoor heat exchanger, an indoor heat exchanger, an expansion valve, and the like. It has.

  As this type of flow path switching valve, a four-way switching valve is well known, but it is considered to use a six-way switching valve instead.

  Hereinafter, an example of a heat pump type air conditioning system having a six-way switching valve will be briefly described with reference to FIG. The heat pump type air conditioning system 100 in the illustrated example is configured to perform switching between operation modes (cooling operation and heating operation) by a six-way switching valve 180. Basically, the compressor 110, the outdoor heat exchanger 120, the indoor A heat exchanger 130, a cooling expansion valve 150, and a heating expansion valve 160 are provided, and a six-way switching valve 180 having six ports pA, pB, pC, pD, pE, and pF is disposed therebetween. Yes.

  The devices are connected by a flow path formed by a conduit (pipe) or the like, and when the cooling operation mode is selected, as shown in FIG. 5A, the high temperature discharged from the compressor 110. The high-pressure refrigerant is led from the port pA of the six-way switching valve 180 to the outdoor heat exchanger 120 through the port pB, where it is condensed by exchanging heat with the outdoor air and becomes a high-pressure two-phase refrigerant. Introduced into the valve 150. The high-pressure refrigerant is depressurized by the cooling expansion valve 150, and the depressurized low-pressure refrigerant is introduced from the port pE of the six-way switching valve 180 to the indoor heat exchanger 130 through the port pF. The refrigerant exchanges (cools) and evaporates, and the low-temperature and low-pressure refrigerant is returned from the indoor heat exchanger 130 from the port pC of the six-way switching valve 180 to the suction side of the compressor 110 via the port pD.

  On the other hand, when the heating operation mode is selected, as shown in FIG. 5B, the high-temperature and high-pressure refrigerant discharged from the compressor 110 passes through the port pA from the port pA of the six-way switching valve 180 through the port pF. It is led to the heat exchanger 130, where it is condensed by exchanging heat with room air (heating) and becomes a high-pressure two-phase refrigerant and introduced into the heating expansion valve 160. The high-pressure refrigerant is depressurized by the heating expansion valve 160, and the depressurized low-pressure refrigerant is introduced from the port pC of the six-way switching valve 180 to the outdoor heat exchanger 120 through the port pB. The refrigerant is evaporated and evaporated, and the low-temperature and low-pressure refrigerant is returned from the outdoor heat exchanger 120 from the port pE of the six-way switching valve 180 to the suction side of the compressor 110 via the port pD.

  As a six-way switching valve incorporated in the heat pump type air conditioning system as described above, a sliding type as described in Patent Document 1 is known. This slide type six-way switching valve has a valve body (valve housing) incorporating a slide type main valve body and an electromagnetic pilot valve (four-way pilot valve), and the ports pA to pF are provided in the valve housing. In addition, a slide type main valve element is disposed so as to be slidable in the left-right direction. The left and right sides of the sliding main valve body in the valve housing are defined by a pair of left and right piston-type packings connected to the sliding main valve body, which are connected to the compressor discharge side and the compressor suction side via pilot valves. And two high pressure fluids (refrigerants) are selectively introduced into and discharged from the two working chambers by the pilot valve, and the pressure difference between the two working chambers is used to The flow path switching is performed by sliding the sliding main valve body in the left-right direction.

JP-A-8-170864

  The conventional flow path switching valve as described above has the following problems to be solved.

  In other words, the slide type six-way switching valve described in Patent Document 1 is configured to switch the flow path by sliding a slide type main valve body with a pair of left and right piston type packings. It is difficult to ensure the accuracy of the sealing surface, and the initial leakage increases, and the sliding part is subject to wear due to repeated operation, and the sealing performance of the sliding part deteriorates accordingly. May increase.

  In addition, since the flow path is switched by sliding the sliding main valve element in a valve housing having a relatively small internal volume, it is difficult to ensure the flow area of both high and low pressure fluids (refrigerants). There is a disagreement that pressure loss increases in both low-pressure fluids (refrigerants).

  In addition, since the slide main valve body having a large sliding area is moved by a pair of left and right piston-type packings and the flow path is switched, there is a problem that the operating differential pressure increases.

  In addition to the above, in the conventional flow path switching valve, in particular, the flow path switching valve used in the heat pump type air conditioning system described above, a high-temperature and high-pressure refrigerant (port pA to port pB, port pA to port pF) in the valve housing. Refrigerant flowing in the low-temperature and low-pressure range (refrigerant flowing from port pC to port pD, and from port pE to port pD) in a close state (state partitioned only by the wall of the sliding main valve body) There is also a problem in that the amount of heat exchange in these valve housings increases and the efficiency of the system deteriorates.

  The present invention has been made in view of the above circumstances. The object of the present invention is to effectively suppress pressure loss and wear of the sliding portion, improve durability, and prevent valve leakage. Another object of the present invention is to provide a six-way switching valve that can suppress the operating differential pressure for moving the main valve body as much as possible.

  Another object of the present invention is to reduce heat loss when used in an environment where a high-temperature and high-pressure fluid and a low-temperature and low-pressure fluid flow, such as a heat pump type air conditioning system. It is an object of the present invention to provide a six-way switching valve that can improve the efficiency.

  In order to achieve the above object, the six-way switching valve according to the present invention basically includes a first and second flow path switching valve each having three ports, and the first and second flow valves. First and second communication passages for communicating between the path switching valves, the communication state between the six ports provided in total in the first and second flow path switching valves is switched, The first flow path switching valve has a cylindrical first main valve housing that defines a first main valve chamber, and first, second, and third ports are opened in the first main valve chamber. The first upper valve seat is provided between the first port and the second port, the first lower valve seat is provided between the second port and the third port, and the first upper valve seat and the first port 1. A poppet-type first main valve element that selectively contacts and separates from the lower valve seat is disposed so as to be movable in the axial direction, and the first main valve element is moved. A second actuator that has a cylindrical second main valve housing that defines a second main valve chamber, and the second main valve chamber includes: The fourth, fifth, and sixth ports are opened, the second upper valve seat is provided between the fourth port and the fifth port, and the second lower valve seat is provided between the fifth port and the sixth port. A poppet type second main valve body selectively contacting and separating from the second upper valve seat and the second lower valve seat is movably disposed in the axial direction, and the second main valve body is A second actuator unit for moving the first and second actuators in the first and second flow valve switching valves by the first and second actuator units in the first and second main valve chambers; By moving the main valve body in conjunction, the second port and the third port in the first flow path switching valve. Are communicated, the fifth port and the sixth port are communicated in the second flow path switching valve, and the first port in the first flow path switching valve and the fourth port in the second flow path switching valve. Port is the first communication path provided between them, and the fluid flows only in the direction from the fourth port in the second flow path switching valve to the first port in the first flow path switching valve. The first communication state communicated via the first communication path provided with a check valve, and the first port and the second port are communicated with each other in the first channel switching valve, and the second channel In the switching valve, the fourth port and the fifth port communicate with each other, and the third port in the first flow path switching valve and the sixth port in the second flow path switching valve are provided therebetween. In front of two passages The communication is made through the second communication path provided with the second check valve for flowing the fluid only in the direction from the sixth port in the second flow path switching valve to the third port in the first flow path switching valve. It is characterized by being able to take a second communication state.

  In a preferred aspect, the first and second actuator portions are provided on one end side of the first and second main valve chambers, and are capable of selectively introducing and discharging a high-pressure fluid. An operation chamber and first and second pistons that define the first and second operation chambers and to which the first and second main valve bodies are connected are configured.

  In another preferred aspect, the first port in the first flow path switching valve, the fourth port in the second flow path switching valve, and the first communication path are arranged on the same axis, and the first flow path The third port in the switching valve, the sixth port in the second flow path switching valve, and the second communication path are arranged on the same axis.

  In another preferred aspect, the first and second flow path switching valves are arranged side by side with the axial direction in the same direction, and the first and second flow path switching valves in the first and second flow path switching valves. The working chamber is located on the same side.

  In a further preferred aspect, the first communication state and the second communication state are switched by moving the first and second main valve bodies in the first and second flow path switching valves in the same direction. To be.

  In another preferred embodiment, high-pressure fluid supplied to the first and second main valve chambers of the first and second flow path switching valves is introduced into the first and second working chambers. The

  In a more preferred aspect, the ports provided in the first and second working chambers of the first and second flow path switching valves for controlling the introduction and discharge of the high-pressure refrigerant to the first and second working chambers, In addition, a single three-way pilot valve connected to the high-pressure part and the low-pressure part of the six-way switching valve is used.

  In the six-way switching valve according to the present invention, in each flow path switching valve, the poppet type main valve body is moved in conjunction with each other in the main valve chamber defined by the cylindrical main valve housing, thereby communicating with each other. (The communication state between two ports that are provided in total in two flow path switching valves, the flow path) is switched, so compared with the conventional six-way switching valve using a sliding main valve body Thus, valve leakage can be suppressed, the flow path area can be made relatively large, and pressure loss can be reduced. In addition, since each of the flow path switching valves is provided with an actuator part (piston or the like) for moving the main valve body, it is possible to suppress an increase in the operating differential pressure.

  In addition to the above, when the six-way switching valve according to the present invention is used in an environment in which a high-temperature and high-pressure refrigerant and a low-temperature and low-pressure refrigerant flow, such as a heat pump type air conditioning system, each flow path switching valve is provided therebetween. Since it is provided at a relatively large distance by the communication passage, the conventional high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant flow in a state where they are close to each other (partitioned only by the wall of the sliding main valve body) As compared with the above, the amount of heat exchange in the main valve housing can be greatly reduced, and therefore the system efficiency can be improved.

  In the six-way switching valve according to the present invention, two check valves are used together with two flow path switching valves (three-way switching valves) to switch between communicating ports. For example, three three-way switching valves There is also an effect that the cost of the entire six-way switching valve can be reduced as compared with the one using the valve.

  In the six-way switching valve according to the present invention, in each flow path switching valve, the high pressure fluid (working pressure) is introduced only into the working chamber provided on one end side (of the piston) to move the main valve body. As a result, the entire configuration of the six-way switching valve can be simplified.

  Problems, configurations, and operational effects other than those described above will be clarified by the following embodiments.

It is a figure which shows one Embodiment of the six-way selector valve which concerns on this invention, (A) is a front view, (B) is a top view, (C) is a left view. The longitudinal cross-sectional view which shows the 1st communication state (at the time of heating operation) of the six-way selector valve shown by FIG. The longitudinal cross-sectional view which shows the 2nd communication state (at the time of air_conditionaing | cooling operation) of the six-way switching valve shown by FIG. It is a figure which expands and shows the three-way pilot valve of the six-way switching valve shown by FIG. 1, (A) is a 1st communication state (at the time of heating operation) (at the time of electricity supply OFF), (B) is a 2nd communication state (cooling) FIG. 4 is a longitudinal sectional view showing each of (when driving) (when energization is ON). In an example of a heat pump type air conditioning system in which a six-way switching valve is used as a flow path switching valve, (A) is a schematic configuration diagram illustrating a cooling operation, and (B) is a schematic configuration diagram illustrating a heating operation.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a view showing an embodiment of a six-way switching valve according to the present invention, FIG. 1 (A) is a front view, FIG. 1 (B) is a plan view, and FIG. 1 (C) is a left side view. . 2 is a longitudinal sectional view showing a first communication state (during heating operation) of the six-way switching valve shown in FIG. 1, and FIG. 3 is a second communication state (cooling operation) of the six-way switching valve shown in FIG. FIG.

  In the present specification, descriptions indicating positions, directions such as up and down, left and right, and front and rear are provided for the sake of convenience in accordance with the drawings in order to avoid complicated explanation, and are actually incorporated in a heat pump type air conditioning system or the like. It does not necessarily indicate the position and direction in the state of being pressed.

  In each drawing, the gap formed between the members, the separation distance between the members, etc. are larger than the dimensions of each constituent member for easy understanding of the invention and for convenience of drawing. Or it may be drawn small.

  The six-way switching valve 1 of the illustrated embodiment is used, for example, as the six-way switching valve 180 in the heat pump type air conditioning system 100 shown in FIG. 5 described above. Basically, two flow switching valves (three-way switching valves) 10 are used. , 20 and a single electromagnetic three-way pilot valve 90 as a pilot valve. The six ports provided in the six-way switching valve 1 of the present embodiment are assigned the same reference numerals corresponding to the ports pA to pF of the six-way switching valve 180.

<Configuration of the hexagonal valve body 9>
The six-way valve main body 9 mainly connects two cylinder-type flow path switching valves 10 and 20 each having three ports (total of six ports) and the two flow path switching valves. Two communication passages 40 and 50 are provided.

  The two flow path switching valves 10 and 20 are vertically arranged with a predetermined distance therebetween (arranged vertically with the directions of the axes O1 and O2 in the vertical direction).

  Each of the communication passages 40 and 50 is made of a metal tube such as aluminum or stainless steel. As can be understood with reference to FIG. The portion (the portion facing the port pB at the same height as the port pB) and the portion slightly above the center of the flow path switching valve 20 (the portion facing the port pC at the same height as the port pC) are in the horizontal direction. Are connected by welding or the like through a communication passage 40 extending to the bottom of the flow path switching valve 10 (the portion facing the port pF at the same height as the port pF) and the lower portion of the flow path switching valve 20 (the same height as the port pE). The portion facing the port pE) is connected by a communication passage 50 extending in the lateral direction by welding or the like.

[Configuration of Channel Switching Valve 10]
The flow path switching valve (first flow path switching valve) 10 disposed on the left side of the hexagonal valve body 9 is made of metal such as aluminum or stainless steel, as can be understood with reference to FIGS. A cylinder-shaped main valve housing 11, and a variable capacity working chamber 12 into which high-pressure fluid (refrigerant) is selectively introduced and discharged sequentially from one end side (upper end side) to the main valve housing 11, and this operation A piston 13 and a main valve chamber 14 that define the chamber 12 are disposed. In the outer periphery of the piston 13 having a concave cross section (annular groove provided in the piston groove 13), the sliding surface gap between the piston 13 (the outer peripheral surface thereof) and the main valve housing 11 (the inner peripheral surface thereof) should be sealed (in other words, In order to airtightly partition the main valve housing 11, an O-ring 13A as a seal member is mounted.

  An umbrella-shaped one end lid member 11A is fixed by caulking, welding or the like so as to hermetically seal the one end opening (upper end opening) of the main valve housing 11, and the working chamber 12 is attached to the one end lid member 11A. A port p10 for introducing and discharging a high-pressure fluid (refrigerant) is attached.

  Further, the other end lid member 11B having a short columnar shape is fixed by caulking, welding or the like so as to hermetically seal the other end side opening (lower end side opening) of the main valve housing 11. A stepped guide shaft 19 is fixed at the center of 11B (inner surface) along the direction of the axis (center line) O1.

  The guide shaft 19 has, from the lower side, a relatively short lower large diameter portion 19A, an intermediate middle diameter portion 19B, and a relatively long upper small diameter portion 19C. The lower large diameter portion 19A is the other end lid member by caulking or the like. While being fixed to 11B, the upper small-diameter portion 19C is slidably fitted in a central fitting insertion hole 15b (lower half portion) provided in a main valve body 15 described later. Further, the guide shaft 19 is formed with a vertical hole (vertical through hole) 19a so as to pass through the center thereof, and a main valve chamber 14 (in detail, A plurality of lateral holes 19b are formed in the main valve chamber 14, which will be described later, and open to the other end side of the lower valve seat 17.

  In the main valve chamber 14, three ports (first port pB, second port pA, third port pF from one end side (upper end side), which are pipe joints extending toward the left, are arranged vertically. An upper valve seat 16 is provided between the port pB and the port pA in the main valve chamber 14 and between the port pA and the port pF in the main valve chamber 14. A lower valve seat 17 whose upper end is a valve seat portion is provided. The upper valve seat 16 and the lower valve seat 17 are formed to project inward from the inner periphery of the main valve housing 11, and the upper valve port defined by the upper valve seat 16 and the lower valve seat 17 is formed. The diameter of the lower valve opening (inner diameter of the valve seat portion) is made smaller than the inner diameter of the main valve housing 11 (that is, the outer diameter of the working chamber 12 and the piston 13).

  Then, the communication passage 40 (flow path switching) is provided on one end side (upper end side) (here, directly above the upper valve seat 16) of the upper valve seat 16 in the main valve chamber 14 so as to face the port pB. A communication passage 40 communicating with one end side from the upper valve seat 26 of the main valve chamber 24 of the valve 20 is communicated laterally, and the other end side (lower end side) of the lower valve seat 17 (here, the lower valve seat 17). The communication passage 50 (the communication passage 50 communicating from the lower valve seat 27 of the main valve chamber 24 of the flow path switching valve 20 to the other end side) is communicated laterally so as to face the port pF. I'm hurt.

  Further, a poppet type main valve body 15 having a recessed outer periphery is formed between the upper valve seat 16 and the lower valve seat 17 in the main valve chamber 14 (predetermined from the inner periphery of the main valve housing 11). Are arranged movably in the direction of the axis O1 (up and down direction).

  The main valve body 15 is selectively brought into and out of contact with the upper valve seat 16 and the lower valve seat 17, and as shown in FIG. One end (upper end) position (heating position) that connects the port pA and the port pF (via the lower valve port of the lower valve seat 17) and the port pB and the communication passage 40. As shown in FIG. 3, the outer peripheral portion of the lower surface is seated on the lower valve seat 17 (the valve seat portion thereof), and the port pA and the port pB are communicated (via the upper valve port of the upper valve seat 16). The other end (lower end) position (cooling position) that allows the port pF and the communication path 50 to communicate with each other can be selectively taken.

  When the main valve body 15 is in one end position (heating position), the port pA and the port pF are also communicated with the communication passage 50, but each of the ports pA and pF and the flow path switching valve 20 are provided. The ports (port pE, port pD) are not communicated by the check valve 55 disposed in the communication passage 50 (the communication state is blocked). Further, when the main valve body 15 is at the other end position (cooling position), the port pA and the port pB are also communicated with the communication path 40. However, the ports pA and pB and the flow path switching valve 20 are provided. The ports (port pC, port pD) are not communicated (the communication state is blocked) by a check valve 45 disposed in the communication path 40 (details will be described later).

  The main valve body 15 is brought into contact with the upper valve seat 16 or the lower valve seat 17 except when moved. At this time, the main valve body 15 is pressed by the high-pressure refrigerant introduced into the main valve chamber 14 and is thus pressed. It is pressed against the valve seat portion of the seat 17.

  In the center of the lower surface of the piston 13, a connecting shaft 18 is integrally extended along the direction of the axis O1. The distal end portion (the other end side) of the connecting shaft 18 has a slightly small diameter, and a male screw is formed on the outer periphery thereof (male screw portion 18a). On the other hand, a stepped center insertion hole 15b is formed in the main valve body 15 so as to penetrate the center thereof, and a part thereof is reduced in diameter, and a female screw is formed on the inner periphery thereof. (Female thread portion 15a). The distal end portion (male screw portion 18a) of the connecting shaft 18 is inserted into the center fitting insertion hole 15b (upper half portion) of the main valve body 15, and is provided on the male screw and the main valve body 15 provided on the connecting shaft 18. When the female screw is screwed, the connecting shaft 18 and the main valve body 15 are integrally connected. As a result, the main valve body 15 is pushed and pulled by the connecting shaft 18 as the piston 13 reciprocates. Thus, it goes back and forth between one end position (heating position) and the other end position (cooling position).

  That is, in the flow path switching valve 10 in the present embodiment, the fluid pressure type (in detail, the main valve body 15 is moved in the direction of the axis O1 (vertical direction) by the working chamber 12 and the piston 13 having the connecting shaft 18. A fluid pressure type actuator unit using a differential pressure between a high pressure refrigerant and a low pressure refrigerant in the system is configured.

  In addition, the upper small diameter portion 19C of the guide shaft 19 is slidably fitted in the lower half portion of the central insertion hole 15b of the main valve body 15 so that the main valve body 15 can be moved in the direction of the axis O1. (In other words, the main valve body 15 is not tilted or displaced with respect to the direction of the axis O1) and is moved up and down in conjunction with the reciprocating movement of the piston 13.

[Configuration of Channel Switching Valve 20]
The basic configuration of the flow path switching valve (second flow path switching valve) 20 disposed on the right side of the hexagonal valve body 9 is substantially the same as that of the flow path switching valve 10 described above, and therefore has the same functions and operations. Are denoted by the same reference numerals (symbols obtained by adding 10 to the reference numerals of the respective parts of the flow path switching valve 10), and redundant description is omitted.

  In the flow path switching valve 20, the main valve chamber 24 includes three ports (one end side (upper end side), a fourth port pC, a fifth port pD, and a sixth port formed of pipe joints extending rightward. Ports pE) are opened in a line, and an upper valve seat 26 having a lower inner end as a valve seat portion is provided between the ports pC and pD in the main valve chamber 24. Between the pD and the port pE, there is provided a lower valve seat 27 whose inner end upper part is a valve seat part.

  Then, the communication passage 40 (flow path switching) is arranged on one end side (upper end side) (here, directly above the upper valve seat 26) of the upper valve seat 26 in the main valve chamber 24 so as to face the port pC. A communication passage 40 communicating with one end side from the upper valve seat 16 of the main valve chamber 14 of the valve 10 is communicated laterally, and the other end side (lower end side) of the lower valve seat 27 (here, the lower valve seat 27). The communication path 50 (the communication path 50 communicating from the lower valve seat 17 of the main valve chamber 14 of the flow path switching valve 10 to the other end side) is communicated laterally so as to face the port pE. I'm hurt.

  That is, in this example, the port pB provided in the flow path switching valve 10, the communication path 40, and the port pC provided in the flow path switching valve 20 are arranged on the same axis O4 extending in the left-right direction, The port pF provided in the path switching valve 10, the communication path 50, and the port pE provided in the flow path switching valve 20 are disposed on the same axis O5 extending in the left-right direction.

  The poppet type main valve body 25 arranged so as to be movable in the direction of the axis O2 (vertical direction) is selectively brought into and out of contact with the upper valve seat 26 and the lower valve seat 27, as shown in FIG. As shown, the outer peripheral portion of the upper surface is seated on the upper valve seat 26 (the valve seat portion thereof), the port pE and the port pD are communicated (via the lower valve port of the lower valve seat 27) and the port pC. One end (upper end) position (heating position) for communicating with the communication path 40 and the outer peripheral portion of the lower surface thereof as shown in FIG. 3 are seated on the lower valve seat 27 (the valve seat portion thereof), and the port pC and the port The other end (lower end) position (cooling position) where the pD communicates (via the upper valve port of the upper valve seat 26) and the port pE communicates with the communication passage 50 can be selectively taken. .

  When the main valve body 25 is in one end position (heating position), the port pE and the port pD are also communicated with the communication passage 50, but each of the ports pE and pD and the flow path switching valve 10 are provided. The ports (port pA, port pF) are not communicated by the check valve 55 disposed in the communication path 50 (the communication state is blocked). Further, when the main valve body 25 is at the other end position (cooling position), the port pC and the port pD are also communicated with the communication path 40. However, the ports pC and pD and the flow path switching valve 10 are provided. The ports (port pA, port pB) are not communicated (the communication state is blocked) by the check valve 45 disposed in the communication path 40 (details will be described later).

  The main valve body 25 is brought into contact with the upper valve seat 26 or the lower valve seat 27 except when moved, and at this time, the main valve body 25 is pressed by the high-pressure refrigerant introduced into the main valve chamber 24 to be pressed. It is pressed against the valve seat portion of the seat 27.

[Configuration of check valves 45 and 55 provided in communication passages 40 and 50]
The communication passages 40 and 50 (the first communication passage 40 and the second communication passage 50) connecting the two flow path switching valves 10 and 20 described above are respectively located near the center of the check valves 45 and 55 (first reverse passage). The large-diameter accommodating portions 44 and 54 in which the stop valve 45 and the second check valve 55) are disposed are connected to both the left and right sides of the large-diameter accommodating portions 44 and 54 to the flow path switching valve 10. Left throttle connection portions 41 and 51, and right throttle connection portions 42 and 52 connected to the flow path switching valve 20.

  The check valve 45 housed in the communication passage 40 (the large diameter housing portion 44) and the check valve 55 housed in the communication passage 50 (the large diameter housing portion 54) have substantially the same configuration. Therefore, in the following, the check valve 45 housed in the communication passage 40 (the large diameter housing portion 44) will be described as a representative. Note that the check valve 55 accommodated in the communication passage 50 (the large-diameter accommodating portion 54) has the same reference numerals in the parts having the same function and function as the check valve 45 (the reference numerals of the parts of the check valve 45 are the same). And a sign obtained by adding 10).

  The check valve 45 allows fluid to flow only in the direction from the flow path switching valve 20 (port pC) to the flow path switching valve 10 (port pB). In order to open and close a valve body holder 46 made of a cylindrical body to be fitted, a short cylindrical valve seat member 47 provided on the right end side of the valve body holder 46, and a valve port provided in the valve seat member 47, And a check valve body 48 slidably disposed on the valve body holder 46.

  The right end portion of the valve body holder 46 is hermetically joined to the flange-shaped portion (outer peripheral terrace portion) of the valve seat member 47 by welding or the like, and a seal is formed on the outer periphery of the valve seat member 47 (annular groove provided on the valve seat member 47). An O-ring 47A as a member is attached. In addition, a hook-like locking portion 46a serving as a stopper for preventing the check valve body 48 from moving to the left is provided on the left end portion of the valve body holder 46 so as to protrude inward.

  The check valve body 48 has a truncated cone-shaped valve body portion 48a that opens and closes a valve port provided in the valve seat member 47 by contacting and separating from the valve seat member 47, and has a valve body holder 46 (inner diameter). The pressure receiving portion 48A is formed in a substantially disc shape having a slightly smaller diameter and a plurality of blade portions 48b (in the illustrated example, four at equal angular intervals) formed radially, and the outer peripheral portion of each blade portion 48b is It is comprised by the sliding part 48B which slidably contacts with the valve body holder 46 (the inner periphery).

  In the check valve 45 configured as described above, when a fluid is flowed from the flow path switching valve 20 to the flow path switching valve 10 (in other words, the fluid pressure in the main valve chamber 24 of the flow path switching valve 20 is changed to the flow path. When the fluid pressure in the main valve chamber 14 of the switching valve 10 is higher), the fluid flowing into the communication passage 40 from the flow path switching valve 20 collides with the pressure receiving portion 48A of the check valve body 48 and the check valve body 48. Is moved to the left (until its left end abuts against the hook-shaped locking portion 46a). Therefore, the valve body 48a of the check valve body 48 is separated from the valve seat member 47 and the valve opening is opened, and the fluid that has passed through the valve opening of the valve seat member 47 is separated from the pressure receiving part 48A of the check valve body 48 and the valve. Clearance between body holders 46 → space between blade portions 48b of sliding portion 48B of check valve body 48 → opening defined by hook-shaped locking portion 46a (inner end) of valve body holder 46 It flows to the flow path switching valve 10 via 46b.

  On the other hand, when fluid flows from the flow path switching valve 10 to the flow path switching valve 20 (in other words, the fluid pressure in the main valve chamber 14 of the flow path switching valve 10 is within the main valve chamber 24 of the flow path switching valve 20. In the case where the fluid pressure is higher than the fluid pressure of the opening 46b defined by the hook-shaped locking portion 46a (inner end) of the valve body holder 46, the fluid flowing into the communication path 40 from the flow path switching valve 10 is reversed. The check valve body 48 is moved to the right by colliding with the pressure receiving portion 48A of the check valve body 48 (via the space between the blade portions 48b of the sliding portion 48B of the valve stop body 48). Therefore, the valve body 48a of the check valve body 48 is seated on the valve seat member 47, the valve port is closed, and the flow into the flow path switching valve 20 is blocked.

  That is, the check valve body 48 in the check valve 45 is connected to the communication passage 40 according to the pressure difference between the flow path switching valve 10 (the main valve chamber 14) and the flow path switching valve 20 (the main valve chamber 24). A left end position that allows inflow of fluid in the direction from the flow path switching valve 20 to the flow path switching valve 10 via the channel, and a fluid in the direction from the flow path switching valve 10 to the flow path switching valve 20 via the communication path 40 The right end position for preventing the inflow of the gas can be selectively taken.

  In the check valve 55 as well, as with the check valve 45, fluid flows only in the direction from the flow path switching valve 20 (port pE) to the flow path switching valve 10 (port pF). The check valve body 58 in the check valve 55 communicates with the communication passage according to the pressure difference between the flow path switching valve 10 (the main valve chamber 14) and the flow path switching valve 20 (the main valve chamber 24). The left end position that allows the inflow of fluid in the direction from the flow path switching valve 20 to the flow path switching valve 10 via 40, and the direction from the flow path switching valve 10 to the flow path switching valve 20 via the communication path 40. A right end position for blocking the inflow of fluid can be selectively taken.

  The main valve bodies 15 and 25 of the two flow path switching valves 10 and 20 described above are in the heating position (the main valve body 15 of the flow path switching valve 10 and the main valve body 25 of the flow path switching valve 20 are both at one end (upper end) position. ) (First communication state as shown in FIG. 2), the space above the main valve body 15 in the main valve chamber 14 communicates with the port pB, and is above the main valve body 25 in the main valve chamber 24. Since the space communicates with the port pC, the pressure above the main valve body 25 in the main valve chamber 24 is higher than the pressure above the main valve body 15 in the main valve chamber 14. The space below the main valve body 15 in the main valve chamber 14 communicates with the port pA (and port pF), and the space below the main valve body 25 in the main valve chamber 24 is the port pD (and port pE). Therefore, the pressure below the main valve body 15 in the main valve chamber 14 is higher than the pressure below the main valve body 25 in the main valve chamber 24.

  Therefore, the check valve body 48 of the check valve 45 provided in the communication path 40 is in the left end position (heating position), and the check valve body of the check valve 55 provided in the communication path 50 is used. 58 is the right end position (heating position).

  On the other hand, the main valve bodies 15 and 25 of the two flow path switching valves 10 and 20 are in the cooling position (both the main valve body 15 of the flow path switching valve 10 and the main valve body 25 of the flow path switching valve 20 are the other end ( (Lower end) position) (second communication state as shown in FIG. 3), the space above the main valve body 15 in the main valve chamber 14 communicates with the port pA (and the port pB), and the main valve chamber 24 Since the space above the main valve body 25 in the port communicates with the port pD (and the port pC), the pressure above the main valve body 15 in the main valve chamber 14 is higher than the pressure above the main valve body 25 in the main valve chamber 24. Get higher. Further, the space below the main valve body 15 in the main valve chamber 14 communicates with the port pF, and the space below the main valve body 25 in the main valve chamber 24 communicates with the port pE. The pressure below the main valve body 25 is higher than the pressure below the main valve body 15 in the main valve chamber 14.

  Therefore, the check valve body 48 of the check valve 45 provided in the communication path 40 is in the right end position (cooling position), and the check valve body of the check valve 55 provided in the communication path 50. 58 is the left end position (cooling position).

  In this example, the diameters of the respective ports pA to pF provided in the respective flow path switching valves 10 and 20 and the respective communication passages 40 and 50 (the left throttle connecting portions 41 and 51 and the right throttle connecting portions thereof). 42 and 52) are set to have substantially the same diameter.

<Operation of the hexagonal valve body 9>
Next, the operation of the six-way valve body 9 having the configuration as described above will be described.

  The main valve bodies 15 and 25 of the respective flow path switching valves 10 and 20 and the check valve bodies 48 and 58 of the respective check valves 45 and 55 are in the heating position (with the main valve body 15 of the flow path switching valve 10). Both the main valve bodies 25 of the flow path switching valve 20 are at one end (upper end) position, the check valve body 48 of the check valve 45 is at the left end position, and the check valve body 58 of the check valve 55 is at the right end position (see FIG. 2). When the working chamber 12 and the working chamber 22 are both communicated with the port pA which is the discharge side high-pressure port via a three-way pilot valve 90 described later in the first communication state as shown in FIG. A high-temperature and high-pressure refrigerant is introduced into the working chamber 22. Therefore, the pressure in the working chamber 12 becomes higher than the pressure in the main valve chamber 14, the piston 13 and the main valve body 15 move downward (while being guided by the guide shaft 19), and the main valve body 15 (the upper outer peripheral portion thereof). Is separated from the upper valve seat 16 (the valve seat portion thereof) and the upper valve port is opened, and the main valve body 15 (the outer peripheral portion of the lower surface thereof) is seated on the lower valve seat 17 (the valve seat portion thereof) and engaged. Stopped. Similarly, the pressure in the working chamber 22 becomes higher than the pressure in the main valve chamber 24, the piston 23 and the main valve body 25 move downward (while being guided by the guide shaft 29), and the upper surface of the main valve body 25 (the upper surface of the main valve body 25). The outer valve portion is separated from the upper valve seat 26 (the valve seat portion) to open the upper valve port, and the main valve body 25 (the outer peripheral portion of the lower surface thereof) is seated on the lower valve seat 27 (the valve seat portion). The contact is locked. Along with this, the pressure above the main valve body 15 in the main valve chamber 14 becomes higher than the pressure above the main valve body 25 in the main valve chamber 24, and the check valve 45 of the check valve 45 provided in the communication path 40. The body 48 moves to the right and is seated on the valve seat member 47 and locked. In addition, the pressure below the main valve body 25 in the main valve chamber 24 is higher than the pressure below the main valve body 15 in the main valve chamber 14, and the check valve 55 of the check valve 55 provided in the communication passage 50. The body 58 moves to the left, opens away from the valve seat member 57, and the check valve body 58 is contacted and locked to the hook-shaped locking portion 56a of the valve body holder 56. As a result, the main valve bodies 15 and 25 of the flow path switching valves 10 and 20 and the check valve bodies 48 and 58 of the check valves 45 and 55 are in the cooling position (the main valve of the flow path switching valve 10). The body 15 and the main valve body 25 of the flow path switching valve 20 are both at the other end (lower end) position, the check valve body 48 of the check valve 45 is the right end position, and the check valve body 58 of the check valve 55 is the left end position. (Second communication state as shown in FIG. 3).

  Thereby, the port pA and the port pB are communicated with each other in the flow path switching valve 10, the port pC and the port pD are communicated with each other in the flow path switching valve 20, and the port pE and the flow path switching valve in the flow path switching valve 20 are communicated. 10 is connected to the port pF through a communication passage 50 (a communication passage 50 in which the check valve 55 is opened) provided therebetween, so that the heat pump type air conditioning system 100 as shown in FIG. In the cooling operation.

  The main valve bodies 15 and 25 of the respective flow path switching valves 10 and 20 and the check valve bodies 48 and 58 of the respective check valves 45 and 55 are in the cooling position (second communication state as shown in FIG. 3). ), When both the working chamber 12 and the working chamber 22 are connected to the port pD which is the suction side low-pressure port via a three-way pilot valve 90 which will be described later, a high-temperature and high-pressure refrigerant is obtained from the working chamber 12 and the working chamber 22. Is discharged. Therefore, the pressure in the working chamber 12 becomes lower than the pressure in the main valve chamber 14, the piston 13 and the main valve body 15 move upward (while being guided by the guide shaft 19), and the main valve body 15 (the outer peripheral portion of the lower surface thereof). Is separated from the lower valve seat 17 (the valve seat portion thereof) and the lower valve opening is opened, and the main valve body 15 (the outer peripheral portion of the upper surface) is seated on the upper valve seat 16 (the valve seat portion thereof) and engaged. Stopped. Similarly, the pressure in the working chamber 22 becomes lower than the pressure in the main valve chamber 24, the piston 23 and the main valve body 25 move upward (while being guided by the guide shaft 29), and the lower surface of the main valve body 25 (the lower surface thereof). The outer peripheral portion is separated from the lower valve seat 27 (the valve seat portion) and the lower valve port is opened, and the main valve body 25 (the upper outer peripheral portion) is seated on the upper valve seat 26 (the valve seat portion). The contact is locked. Along with this, the pressure above the main valve body 25 in the main valve chamber 24 becomes higher than the pressure above the main valve body 15 in the main valve chamber 14, and the check valve 45 of the check valve 45 provided in the communication path 40. The body 48 moves to the left, opens away from the valve seat member 47, and the check valve body 48 is contacted and locked to the hook-shaped locking portion 46a of the valve body holder 46. Further, the pressure below the main valve body 15 in the main valve chamber 14 becomes higher than the pressure below the main valve body 25 in the main valve chamber 24, and the check valve 55 of the check valve 55 provided in the communication passage 50 is used. The body 58 moves to the right and is seated on the valve seat member 57 and locked. As a result, the main valve bodies 15 and 25 of the respective flow path switching valves 10 and 20 and the check valve bodies 48 and 58 of the respective check valves 45 and 55 are moved to the heating position (the main valve of the flow path switching valve 10). The body 15 and the main valve body 25 of the flow path switching valve 20 are both at one end (upper end) position, the check valve body 48 of the check valve 45 is at the left end position, and the check valve body 58 of the check valve 55 is at the right end position) ( (First communication state as shown in FIG. 2).

  As a result, the port pA and the port pF are communicated with each other in the flow path switching valve 10, the port pE and the port pD are communicated with each other in the flow path switching valve 20, and the port pC and the flow path switching valve in the flow path switching valve 20 are communicated. 10 is connected to the port pB via the communication passage 40 (the communication passage 40 in which the check valve 45 is opened) provided therebetween, so that the heat pump type air conditioning system 100 as shown in FIG. The heating operation is performed.

  Here, in this embodiment, the outer diameter (seat diameter) of the main valve body 15 in the flow path switching valve 10 is made smaller than the inner diameter of the main valve housing 11 (that is, the pressure receiving diameter of the piston 13), and the flow path switching valve. 20, the outer diameter (seat diameter) of the main valve body 25 is smaller than the inner diameter of the main valve housing 21 (that is, the pressure-receiving diameter of the piston 23). When switching to operation and when switching from cooling operation to heating operation), the main valve bodies 15 and 25 of the flow path switching valves 10 and 20 can be reliably moved with a simple configuration. Yes.

<Configuration of three-way pilot valve 90>
The structure itself of the three-way pilot valve 90 as a pilot valve is well known. As shown in an enlarged view in FIG. 4, an electromagnetic coil 91 is fitted and fixed to the outer periphery of the base end side (upper end side). A valve case 92 made of a cylindrical straight pipe is provided, and a suction element 95, a compression coil spring 96, and a plunger 97 are arranged in series in the valve case 92 in this order from the base end side.

  The upper end portion of the valve case 92 is hermetically joined to the flange portion (outer peripheral terrace portion) of the attractor 95 by welding or the like, and the attractor 95 is attached to the cover case 91A that covers the outer periphery of the electromagnetic coil 91 for energization excitation. The bolt 92B is fastened and fixed.

  On the other hand, a filter-attached lid member 98 having a narrow tube insertion port (high pressure introduction port a) for introducing a high pressure refrigerant is hermetically attached to the lower end opening of the valve case 92 by welding, brazing, caulking, or the like. A region surrounded by the lid member 98, the plunger 97, and the valve case 92 is a valve chamber 99. The valve chamber 99 is connected to the port (discharge-side high-pressure port) pA through a flexible high-pressure thin tube #a that is airtightly inserted into the thin tube insertion port (high-pressure introduction port a) of the lid member 98. A high-temperature and high-pressure refrigerant is introduced.

  Further, between the plunger 97 and the lid member 98 in the valve case 92, a valve seat 93 whose inner end surface is a flat valve seat surface is airtightly joined by brazing or the like. The valve seat surface (inner end surface) of the six-way valve main body 9 has a narrow tube #b in the working chamber 12 of the flow path switching valve 10 and the working chamber 22 of the flow path switching valve 20 in order from the front end side (lower end side). Are connected to each other in a longitudinal direction (vertical direction) of the valve case 92 at predetermined intervals along the longitudinal direction (vertical direction) of the port b connected to the port b and the port (suction side low-pressure port) pD. Opened.

  The plunger 97 disposed to face the suction element 95 is basically cylindrical, and is slidably disposed in the valve case 92 in an axial direction (a direction along the center line L of the valve case 92). . At the end of the plunger 97 opposite to the suction element 95 side, a valve body holder 94A for holding the valve body 94 so as to be slidable in the thickness direction on its free end side has its base end together with the fixture 94B. It is fixed by press fitting or caulking. A leaf spring 94C that urges the valve body 94 in a direction (thickness direction) to press the valve body 94 against the valve seat 93 is attached to the valve body holder 94A. The valve body 94 is in contact with the valve seat surface of the valve seat 93 in order to switch the communication state between the ports b and c that open to the valve seat surface of the valve seat 93, and the valve seat of the valve seat 93 The surface slides as the plunger 97 moves up and down.

  In addition, the valve body 94 is provided with a concave portion 94a having a size capable of communicating between the two ports bc opened on the valve seat surface of the valve seat 93.

  Further, the compression coil spring 96 is mounted between the suction element 95 and the plunger 97 and biases the plunger 97 in a direction (downward in the drawing) to separate the plunger 97 from the suction element 95. Then, the valve seat 93 (the upper end portion thereof) is a stopper that prevents the plunger 97 from moving downward. It goes without saying that other configurations can be adopted as the configuration of the stopper.

  The three-way pilot valve 90 is attached to the back side of the six-way valve main body 9 or the like (in the illustrated example, the back side of the flow path switching valve 10) via a fixture 92A.

<Operation of the three-way pilot valve 90>
In the three-way pilot valve 90 configured as described above, when the energization of the electromagnetic coil 91 is turned off, as shown in FIG. 2 and FIG. The lower end is pushed down to a position where it contacts the valve seat 93. In this state, the valve element 94 is positioned on the port b and the port c, and the port b and the port c communicate with each other by the recess 94a, so that the high-pressure fluid in the working chamber 12 and the working chamber 22 flows into the port p10 and the port p20 → capillary tube. # B → port b → recess 94a → port c → capillary tube # c → port (suction side low pressure port) pD is discharged.

  On the other hand, when the energization of the electromagnetic coil 91 is turned on, the plunger 97 is positioned so that the upper end of the plunger 97 comes into contact with the attractor 95 by the attracting force of the attractor 95 as shown in FIG. 3 and FIG. (Against the biasing force of the compression coil spring 96). At this time, since the valve element 94 is located only on the port c and the port b and the valve chamber 99 communicate with each other, the high-pressure fluid flowing into the port (discharge side high-pressure port) pA is high-pressure capillary # a → valve chamber 99 → It is introduced into the working chamber 12 and the working chamber 22 through port b → capillary tube # b → port p10 and port p20.

  Therefore, when the energization to the electromagnetic coil 91 is turned off, the main valve bodies 15 and 25 of the flow path switching valves 10 and 20 and the check valve bodies 48 and 58 of the check valves 45 and 55 are in the cooling position. When the flow is switched from the (second communication state) to the heating position (first communication state) and the flow path switching is performed as described above, when the energization to the electromagnetic coil 91 is turned ON, the flow path switching valves 10 and 20 are switched on. Main valve bodies 15 and 25, and check valve bodies 48 and 58 of the respective check valves 45 and 55 are shifted from the heating position (first communication state) to the cooling position (second communication state). The flow path is switched as described above.

  As described above, in the six-way switching valve 1 of the present embodiment, the energization of the electromagnetic three-way pilot valve 90 is switched ON / OFF, whereby the high-pressure fluid (port pA that is the high-pressure portion) that circulates in the six-way switching valve 1. The main valve bodies 15 and 25 of the flow path switching valves 10 and 20 constituting the six-way valve main body 9 using the differential pressure between the low-pressure fluid (the fluid flowing through the port pD which is the low-pressure portion) and the low-pressure fluid. By interlocking movement in the valve chambers 14 and 24, the communication state between the ports provided in total in the two flow path switching valves 10 and 20 is switched, and a heat pump type as shown in FIG. In the cooling / heating system 100, switching from heating operation to cooling operation and switching from cooling operation to heating operation can be performed.

<Operation and effect of the six-way switching valve 1>
As understood from the above description, in the six-way switching valve 1 of the present embodiment, the main valve chamber 14 defined by the cylindrical main valve housings 11 and 21 in the flow path switching valves 10 and 20. , 24 by moving the poppet-type main valve bodies 15 and 25 in conjunction with each other, thereby communicating between the ports (communication state between two ports provided in total in two flow path switching valves, flow paths). Therefore, the valve leakage can be suppressed and the flow passage area can be made relatively large and the pressure loss can be reduced as compared with the conventional six-way switching valve using the slide type main valve body. Further, since each of the flow path switching valves 10 and 20 is provided with an actuator portion for moving the main valve bodies 15 and 25, it is possible to suppress an increase in the operating differential pressure. In addition to the configuration using the piston as described above, the actuator unit may be configured to drive the main valve bodies 15 and 25 using a solenoid or a motor.

  In addition to the above, when the six-way switching valve 1 of the present embodiment is used in an environment in which a high-temperature and high-pressure refrigerant and a low-temperature and low-pressure refrigerant flow, such as a heat pump type air conditioning system, The high temperature and high pressure refrigerant and the low temperature and low pressure refrigerant are close to each other (a state where only the wall of the slide type main valve body is partitioned). ), The amount of heat exchange in the main valve housings 11 and 21 can be greatly reduced, so that the efficiency of the system can be improved.

  Further, in the six-way switching valve 1 of the present embodiment, since the two check valves 45 and 55 are used together with the two flow path switching valves (three-way switching valves) 10 and 20, the communication ports are switched. For example, there is an effect that the cost of the entire six-way switching valve can be reduced as compared with those using a plurality of flow path switching valves (two-way switching valves and three-way switching valves).

  Further, in the six-way switching valve 1 of the present embodiment, a high-pressure fluid (working pressure) is applied only to the working chambers 12 and 22 provided on one end side (of the pistons 13 and 23) in each of the flow path switching valves 10 and 20. The main valve bodies 15 and 25 are introduced and moved, and the outer diameters (seat diameters) of the main valve bodies 15 and 25 are made smaller than the pressure receiving diameters of the pistons 13 and 23. Therefore, there is also an effect that the main valve bodies 15 and 25 of the respective flow path switching valves 10 and 20 can be reliably moved.

  In the six-way switching valve 1 of the above-described embodiment, the flow path switching valve 10 is provided with three ports (port pB, port pA, and port pF) in the left direction, and the flow path switching valve 20 has three ports in the right direction. Ports (port pC, port pD, port pE) are provided, but the arrangement configuration (direction, position, etc.) of the six ports pA to pF is not limited to the illustrated example. For example, each port (pipe joint) pB, pA, pF provided in the flow path switching valve 10 and each port (pipe joint) pC, pD, pE provided in the flow path switching valve 20 are directed forward or rearward. It may be extended so that the mounting directions of all the ports (pipe joints) pA to pF are made to coincide.

  Of course, the six-way switching valve 1 of the present embodiment can be incorporated not only in the heat pump air conditioning system but also in other systems, devices, and devices.

1 6-way switching valve 9 6-way valve body 10, 20 flow path switching valve (first flow path switching valve, second flow path switching valve)
11, 21 Main valve housing (first main valve housing, second main valve housing)
12, 22 Working chamber (first working chamber, second working chamber)
13, 23 piston (first piston, second piston)
14, 24 Main valve chamber (first main valve chamber, second main valve chamber)
15, 25 Main valve body (first main valve body, second main valve body)
16, 26 Upper valve seat (first upper valve seat, second upper valve seat)
17, 27 Lower valve seat (first lower valve seat, second lower valve seat)
18, 28 Connection shaft 19, 29 Guide shaft 40, 50 Communication path (first communication path, second communication path)
45, 55 Check valve (first check valve, second check valve)
48, 58 Check valve body 90 Three-way pilot valve pA, pB, pC, pD, pE, pF Port

Claims (7)

The first and second flow path switching valves each having three ports, and the first and second communication paths for communicating between the first and second flow path switching valves, A six-way switching valve configured to switch communication states between a total of six ports provided in the second flow path switching valve,
The first flow path switching valve has a cylindrical first main valve housing that defines a first main valve chamber, and first, second, and third ports are opened in the first main valve chamber. The first upper valve seat is provided between the first port and the second port, the first lower valve seat is provided between the second port and the third port, and the first upper valve seat and the first port A poppet-type first main valve body that selectively contacts and separates from a lower valve seat is disposed so as to be movable in the axial direction, and a first actuator section is provided for moving the first main valve body. ,
The second flow path switching valve has a cylindrical second main valve housing that defines a second main valve chamber, and fourth, fifth, and sixth ports are opened in the second main valve chamber. The second upper valve seat is provided between the fourth port and the fifth port, the second lower valve seat is provided between the fifth port and the sixth port, and the second upper valve seat and the second 2 A poppet-type second main valve element that selectively contacts and separates from the lower valve seat is disposed so as to be movable in the axial direction, and a second actuator part is provided for moving the second main valve element. ,
By moving the first and second main valve bodies in conjunction with each other in the first and second main valve chambers in the first and second flow path switching valves by the first and second actuator portions,
In the first flow path switching valve, the second port and the third port are communicated. In the second flow path switching valve, the fifth port and the sixth port are communicated, and the first flow path switching valve. The first port in the first flow path and the fourth port in the second flow path switching valve are the first communication path provided therebetween, and the first flow path switching from the fourth port in the second flow path switching valve. A first communication state in which communication is made via the first communication path provided with a first check valve for flowing a fluid only in a direction toward the first port of the valve;
In the first flow path switching valve, a first port and a second port are communicated. In the second flow path switching valve, a fourth port and a fifth port are communicated, and the first flow path switching valve. The third port of the second flow path and the sixth port of the second flow path switching valve are the second communication path provided between them, and the first flow path switching from the sixth port of the second flow path switching valve. A second communication state in which communication is made via the second communication path provided with a second check valve that allows fluid to flow only in a direction toward the third port of the valve;
A six-way switching valve characterized by being able to take   The first and second actuator portions are provided on one end side of the first and second main valve chambers, and have a variable capacity first and second working chambers for selectively introducing and discharging high-pressure fluid, and The first and second working chambers are defined, and the first and second main valve bodies are connected to each other, and are configured to include first and second pistons. 6-way switching valve. The first port in the first flow path switching valve, the fourth port in the second flow path switching valve, and the first communication path are arranged on the same axis,
The third port in the first flow path switching valve, the sixth port in the second flow path switching valve, and the second communication path are disposed on the same axis. The six-way switching valve described in 1.   The first and second flow path switching valves are arranged side by side with the axial direction in the same direction, and the first and second working chambers in the first and second flow path switching valves are on the same side. The six-way switching valve according to claim 2, wherein the six-way switching valve is arranged.   The first communication state and the second communication state are switched by moving the first and second main valve bodies in the first and second flow path switching valves in the same direction. The six-way switching valve according to claim 4.   The high-pressure fluid supplied to the first and second main valve chambers of the first and second flow path switching valves is introduced into the first and second working chambers. The six-way switching valve according to claim 2.   Control of the introduction and discharge of the high-pressure refrigerant to the first and second working chambers is performed using the ports provided in the first and second working chambers of the first and second flow path switching valves and the hexagonal switching. 7. The six-way switching valve according to claim 6, wherein the six-way switching valve is constituted by a single three-way pilot valve connected to the high-pressure part and the low-pressure part of the valve.

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