JP2018194022A - Flow channel switch valve and its assembling method - Google Patents

Abstract

To provide a flow channel switch valve and its assembling method capable of minimizing valve leakage.SOLUTION: A plurality of ports pA-pF are connected to main valve housings 11, 51 by brazing and the like, and cylindrical inner housing members (upper inner housing members 21, 61, lower inner housing members 22, 62) provided with valve seats (one end-side main valve seats 27, 67, other end-side main valve seats 28, 68, sub-valve seats 29, 69) for making main valve elements 15, 55 be kept into contact therewith and separated therefrom, and piston sliding faces 36, 37, 76, 77 with which pistons (one end-side pistons 31, 71, other end-side pistons 32, 72) are slidably kept into contact, are internally fitted to the main valve housings 11, 51.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flow path switching valve that switches a flow path by moving a valve element in a valve chamber and an assembling method thereof.

  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.

  An example of a heat pump type air conditioning system having a six-way switching valve will be briefly described below with reference to FIGS. 8 (A) and 8 (B). 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, the high temperature discharged from the compressor 110 as shown in FIG. 8A. 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. 8 (B), 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.

  That is, in the above conventional flow path switching valve, each port is normally connected to the valve housing (valve body) by brazing or the like. After the entire valve housing is heated during brazing, the valve housing is processed. When heat is removed, the shape of the valve housing is distorted, and depending on the processing conditions, the valve seat (valve seat surface) provided on the valve housing and the sliding surface of the piston-type packing are also deformed. There is a risk of valve leakage.

  Further, the slide type flow path switching valve described in Patent Document 1 is configured to perform flow path switching by sliding a slide main valve body with a pair of left and right piston type packings. It is difficult to ensure the accuracy of the sealing surface of the valve body, the initial leakage increases, and the sliding part is subject to wear due to repeated operation, resulting in poor sealing performance of the sliding part. There is also a risk of increasing the amount of leakage.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a flow path switching valve capable of suppressing valve leakage as much as possible and an assembling method thereof.

  In order to achieve the above object, a flow path switching valve according to the present invention basically has a valve housing that defines a valve chamber, and a plurality of ports are opened in the valve chamber. A body is movably disposed, and an actuator unit having a piston connected to the valve body for moving the valve body is provided, and by moving the valve body in the valve chamber by the actuator unit, The communication state between each port is switched, the plurality of ports are connected to the valve housing, and a cylindrical inner housing member is fitted therein, and the inner housing member is connected between the ports. A valve seat for contacting and separating the valve body is provided to switch the communication state, and the piston connected to the valve body is slidably disposed in the axial direction. It is set to.

  The valve body is preferably a poppet type valve body.

  In a preferred embodiment, the end portion of the inner housing member is brought into contact with a step portion provided on the inner periphery of the valve housing.

  In a further preferred aspect, the valve seat is provided at the end of the inner housing member.

  The inner housing member is preferably made of a material having a lower thermal conductivity than the valve housing.

  The inner housing member is preferably made of a material that is more rigid than the valve housing.

  In a further preferred embodiment, the inner housing member is made of stainless steel and the valve housing is made of brass.

  In another preferred embodiment, the plurality of ports are connected to the valve housing by brazing.

  The flow path switching valve assembly method according to the present invention basically includes a valve housing that defines a valve chamber, and a plurality of ports are opened in the valve chamber, and the valve body moves. An actuator unit having a piston that is freely arranged and connected to the valve body for moving the valve body is provided, and the valve body is moved in the valve chamber by the actuator unit, thereby The flow path switching valve assembly method is configured to switch the communication state of the plurality of ports, the step of connecting the plurality of ports to the valve housing, and the valve housing to which the plurality of ports are connected, In order to switch the communication state between the ports, a valve seat for contacting and separating the valve body is provided, and the piston to which the valve body is connected is slidably disposed in the axial direction. It is characterized in that it comprises the steps of internally fitted fix ing member.

  According to the present invention, a plurality of ports are connected to the valve housing by brazing or the like, and the valve housing is provided with a valve seat on which the valve body contacts and separates and a piston sliding surface on which the piston slides. Since the inner housing member is fitted, the deformation (distortion) of the valve housing that occurs when the ports are connected by brazing, etc., affects the valve seat that contacts the valve body and the piston sliding surface that the piston slides on. Therefore, valve leakage can be reliably suppressed.

  Further, since the poppet type valve element is moved in the valve chamber defined by the valve housing, the communication ports (communication state, flow path) can be switched. Valve leakage can be more reliably suppressed as compared with a flow path switching valve using a valve body.

  Further, for example, the inner housing member is made of stainless steel, the valve housing is made of brass, and the inner housing member fitted into the valve housing has a lower thermal conductivity or a higher rigidity (strength) than the valve housing. Therefore, heat exchange with the valve housing can be reduced, and deterioration due to wear of the abutting portion and sliding portion can be suppressed. This also prevents the valve seat and piston slide provided on the inner housing member. Since the deformation of the moving surface can be suppressed, the durability can be improved and the valve leakage can be further prevented.

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

The longitudinal cross-sectional view which shows the 1st communication state (at the time of heating operation) of one Embodiment of the six-way selector valve which concerns on this invention. The longitudinal cross-sectional view which shows the 2nd communication state (at the time of air_conditionaing | cooling operation) of one Embodiment of the six-way selector valve which concerns on this invention. FIG. 2 is a partially exploded longitudinal sectional view of the main valve housing shown in FIG. 1. FIG. 2 is a partially exploded longitudinal sectional view of the main valve housing shown in FIG. 1. It is a figure which expands and shows the four-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). The longitudinal cross-sectional view which shows the six-way valve main-body part of the other example (the 1st communication state (at the time of heating operation)) of the six-way switching valve shown by FIG. The longitudinal cross-sectional view which shows the six-way valve main-body part of the further other example (the 1st communication state (at the time of heating operation)) of the six-way switching valve shown by FIG. 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.

  1 and 2 are views showing an embodiment of a six-way switching valve according to the present invention. FIG. 1 is a longitudinal sectional view showing a first communication state (during heating operation), and FIG. It is a longitudinal cross-sectional view which shows a state (during cooling operation).

  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 as, for example, the six-way switching valve 180 in the heat pump type air conditioning system 100 shown in FIGS. 8A and 8B described above, and basically switches two flow paths. A six-way valve main body 9 configured by combining valves (four-way switching valves) 10 and 50 and a single electromagnetic four-way pilot valve 90 as a pilot valve are provided. 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 body 9 is mainly composed of two cylinder-type channel switching valves 10 and 50 each having three ports (total of six ports), and between the two channel switching valves 10 and 50. Are provided with two communication passages 85 and 86 for communicating with each other.

  The two flow path switching valves 10 and 50 are vertically arranged side by side with a predetermined distance (arranged vertically with the directions of the axes O1 and O5 in the vertical direction).

  Each of the communication passages 85 and 86 is formed of a straight (straight) tube made of metal such as aluminum, copper, or stainless steel, and the upper left of the flow path switching valve 10 (the main valve housing 11). The passage (the portion above the port pA) and the upper right portion (portion facing the port pB at the same height as the port pB) of the flow path switching valve 50 (the main valve housing 51) extend in the lateral direction. 85 is airtightly connected by brazing or the like, and the lower left portion of the flow path switching valve 10 (the main valve housing 11) (the portion facing the port pE at the same height as the port pE) and the flow path switching valve 50 ( Of the main valve housing 51 is hermetically connected to the lower right portion (portion below the port pD) by brazing or the like through a communication passage 86 extending in the lateral direction.

[Configuration of Channel Switching Valve 10]
A flow path switching valve (first flow path switching valve) 10 disposed on the right side of the hexagonal valve main body 9 includes a cylindrical main valve housing (valve housing) 11 made of metal such as brass, aluminum, or stainless steel. The main valve housing 11 has, in order from one end side (upper end side), one end side working chamber 41, one end side piston 31, main valve chamber (valve chamber) 12, the other end side piston 32, and the other end side operation. The chamber 42 is distributed.

  One end side and the other end side pistons 31, 32 (outer peripheral surface thereof) and the main valve housing 11 (in more detail) are respectively provided on the outer peripheries of the one end side and the other end side pistons 31, 32 having a concave cross section. Is to seal the sliding surface clearance between the upper and lower inner housing members 21 and 22 (inner peripheral surfaces) fitted in the main valve housing 11 (to be described later) (in other words, the main valve housing 11 is hermetically sealed). An O-ring 33 as a seal member is mounted, and a ring-shaped packing 34 made of synthetic resin such as Teflon (registered trademark) for reducing sliding resistance is provided outside the O-ring 33. An annular pressing member 35 is attached and fixed (for example, by press-fitting, caulking, etc.) while being attached and holding the O-ring 33 and the packing 34 to prevent them from coming off.

  One end lid member having a thick disk shape by screwing, caulking, welding or the like so as to hermetically seal the one end opening (upper end opening) and the other end opening (lower end opening) of the main valve housing 11. 11A and the other end lid member 11B are fixed. In this example, one end (upper end) and the other end (lower end) of the main valve housing 11 are slightly larger in diameter, and the one end and the other end large diameter portions 11a and 11b (internal thread portions formed on the inner periphery thereof) A stepped disc-shaped one end lid member 11A and the other end lid member 11B (a male screw portion formed on the outer periphery thereof) are screwed and fixed. Thus, on one end side of the main valve housing 11 (below the one end lid member 11A and above the one end side piston 31) and the other end side (above the other end cover member 11B and below the other end side piston 32), A variable-capacity one-end working chamber 41 and the other-end working chamber 42 into which high-pressure fluid (refrigerant) is selectively introduced and discharged are defined. High pressure fluid (refrigerant) is introduced into and discharged from one end side working chamber 41 and the other end side working chamber 42 at one end (one end large diameter portion 11a) and the other end (other end large diameter portion 11b) of the main valve housing 11, respectively. Ports p10a and p10b are attached.

  The main valve housing 11 has three ports (a first port pA, a second port pF, a third port pE from one end side (upper end side) formed of pipe joints extending rightward at substantially equal intervals. Are opened in the main valve chamber 12 by being hermetically connected by brazing or the like (in the direction of the axis O1).

  Further, the communication passage 85 (communication passage 85 communicating from the one end side main valve seat 67 of the main valve chamber 52 of the flow path switching valve 50 to one end side from the port pA in the main valve chamber 12 to one end (upper end) side. ) Is communicated laterally, and the communication passage 86 (communication passage 86 communicating from the sub valve seat 69 of the main valve chamber 52 of the flow path switching valve 50 to the other end side) is opposed to the port pE. It is connected sideways.

  Upper and lower inner housing members (inner housing members) 21 and 22 made of metal such as aluminum or stainless steel are fitted and fixed to the upper portion (inner periphery) and the lower portion (inner periphery) of the main valve housing 11, respectively. Yes.

  Specifically, the upper and lower inner housing members 21 and 22 are formed of a cylindrical tube having a slightly smaller diameter than the main valve housing 11, and can be understood by referring to FIG. 3 together with FIGS. Further, the upper inner housing member 21 inserted into the upper portion of the main valve housing 11 includes, from below, a short cylindrical member 21a that is relatively short in the direction of the axis O1 and a long cylindrical member 21b that is relatively long in the direction of the axis O1. The two parts configuration. An opening 23 corresponding to the upper port pA provided in the main valve housing 11 is provided on the side portion (right side portion) of the short cylindrical member 21a, and from the lower end portion toward the inside (axis line) An end-side main valve seat 27 whose inner end upper part is a valve seat portion is provided so as to protrude toward O1). On the other hand, the side (left side) of the long cylindrical member 21b is provided with (continuous) the opening 24 corresponding to the communication path 85, and from the lower end thereof to the inside (toward the axis O1), A sub-valve seat 29 having a lower inner end as a valve seat portion is projected. The short cylindrical member 21a and the long cylindrical member 21b are hermetically sealed by welding or the like on a bowl-shaped portion (outer terrace) provided at the outer periphery of the lower cylindrical member 21b at the upper end of the short cylindrical member 21a. They are joined and connected together.

  Here, an annular step portion (step portion formed by reducing the inner diameter) 13 is provided on the inner peripheral portion of the port pF in the main valve housing 11.

  After connecting the ports pA, pF, pE and the communication passages 85, 86 to the main valve housing 11 by brazing or the like, the upper inner housing member 21 includes the opening 23 (of the short cylindrical member 21a) and With the opening 24 (of the long cylindrical member 21b) aligned with the port pA and the communication passage 85, it is inserted into the main valve housing 11 through the one end side opening of the main valve housing 11, and the (short) The lower end of the cylindrical member 21a is brought into contact with the stepped portion 13 (the upper surface thereof) of the main valve housing 11, and the upper end (of the long cylindrical member 21b) is the upper inner periphery of the main valve housing 11 (see FIG. In the example shown, it is caulked by a caulking portion 14a provided on the inner circumference immediately below the large-diameter portion 11a.

  Inside the upper inner housing member 21 (the long cylindrical member 21b) (specifically, the inner circumference above the opening 24 corresponding to the communication path 85), the one end side piston 31 is in the vertical direction (in the direction of the axis O1). It is slidably distributed on. That is, the inner periphery (surface) of the upper inner housing member 21 (the long cylindrical member 21b) is a smooth piston sliding surface 36 with which the one end side piston 31 is in sliding contact.

  In addition, it forms in the lower end part outer periphery between the said upper inner housing member 21 (outer periphery) and the main valve housing 11 (inner periphery), specifically the upper inner housing member 21 (short cylindrical member 21a). A corner portion defined between the chamfered portion (inclined surface) and the stepped portion 13 of the main valve housing 11, and the lower side of the opening 24 of the upper inner housing member 21 (the long cylindrical member 21b). (In other words, between the opening 23 and the opening 24) and the annular grooves formed on the outer periphery (in other words, between the opening 23 and the upper end), respectively, three O-rings 21c as sealing members, 21d and 22e are attached (see especially FIG. 3).

  On the other hand, the lower inner housing member 22 inserted into the lower portion of the main valve housing 11 is provided in the main valve housing 11 on the right side thereof, as can be understood by referring to FIGS. An opening 25 corresponding to the lower port pE formed is provided, and an opening 26 corresponding to the communication path 86 is provided on the left side thereof. The other end side main valve seat 28 with the inner end lower portion serving as a valve seat portion is provided to project (toward O1).

  After the ports pA, pF, pE and the communication passages 85, 86 are connected to the main valve housing 11 by brazing or the like, the lower inner housing member 22 has an opening 25 and an opening 26 with the port pE and the communication passage. 86 is inserted into the main valve housing 11 through the opening on the other end side of the main valve housing 11 in a state of being aligned with respect to the main valve housing 11, and the upper end portion thereof is on the step portion 13 (the lower surface thereof) of the main valve housing 11. The lower end of the main valve housing 11 is caulked by a caulking portion 14b provided in the lower inner circumference of the main valve housing 11 (in the illustrated example, the inner circumference immediately above the other end large-diameter portion 11b). ing.

  On the inner side of the lower inner housing member 22 (specifically, the inner periphery below the opening 25 corresponding to the port pE and the opening 26 corresponding to the communication path 86), the other end-side piston 32 is moved in the vertical direction (axis O1). Direction). That is, the inner periphery (surface) of the lower inner housing member 22 is a smooth piston sliding surface 37 with which the other end side piston 32 is in sliding contact.

  A chamfered portion (inclined surface) formed between the lower inner housing member 22 (outer periphery) and the main valve housing 11 (inner periphery), specifically, an upper end outer periphery of the lower inner housing member 22. And a corner defined between the step portion 13 of the main valve housing 11 and the lower side of the openings 25 and 26 of the lower inner housing member 22 (in other words, between the openings 25 and 26 and the lower end portion). ) Are provided with two O-rings 22c and 22d as seal members (see in particular FIG. 4).

  The main valve housing 11 and the upper and lower inner housing members 21 and 22 fitted in the main valve housing 11 can be made of an appropriate material as described above. In order to reduce heat exchange with the main valve housing 11 or contact portions of the upper and lower inner housing members 21 and 22 (one end side main valve seat 27, the other end side main valve seat 28, and the sub valve seat 29) The upper and lower inner housing members 21 and 22 are made of a material having a lower thermal conductivity or rigidity than the main valve housing 11 in order to suppress deterioration due to wear or the like of the sliding portions (piston sliding surface 36, piston sliding surface 37). It is good to produce with a material with high (strength). As an example, if the main valve housing 11 is made of brass, the upper and lower inner housing members 21 and 22 may be made of stainless steel.

  That is, in the present embodiment, the upper and lower inner housing members 21 and 22 fitted in the main valve housing 11 have an inner end upper portion between the port pF and the port pA in the main valve chamber 12 and the valve seat portion. One end side main valve seat 27 is provided. Between the port pF and the port pE in the main valve chamber 12, the other end side main valve seat 28 whose inner end lower part is a valve seat portion is provided. In the chamber 12, a sub-valve seat 29 is provided on the one end side from the port pA and the other end side from the communication path 85 (in other words, between the port pA and the communication path 85). Yes.

  Further, as described above, the one end side main valve seat 27, the sub valve seat 29, and the other end side main valve seat 28 are formed by the upper inner housing member 21 and the lower inner housing member 22 fitted in the main valve housing 11. It projects from the inner periphery toward the inside (toward the axis O1) (integrally), and is defined by the one end side main valve seat 27, the sub valve seat 29, and the other end side main valve seat 28. The diameters of the one end side main valve port, the sub valve port, and the other end side main valve port (inner diameter of the valve seat portion) are the upper inner housing member 21 and the lower inner housing member arranged in the main valve housing 11. 22 (that is, the outer diameter of the one end side working chamber 41, the one end side piston 31, the other end side piston 32, and the other end side working chamber 42).

  Further, in the main valve chamber (valve chamber) 12, a poppet type main valve body (valve body) 15 (with a predetermined interval from the inner periphery of the main valve housing 11) is arranged in the direction of the axis O1 (vertical direction). It is distributed freely.

  In the present example, the main valve body 15 includes, for example, an upper valve body 16 made of, for example, synthetic resin, disposed between the sub valve seat 29 and the one end side main valve seat 27 in the main valve chamber 12, and the main valve. The lower valve body 17 made of, for example, synthetic resin is disposed below the other end side main valve seat 28 in the chamber 12, and the upper valve body 16 and the lower valve body 17 extend along the direction of the axis O1 ( That is, they are connected and integrated through a connecting shaft 18 (inserted inside the step portion 13 of the main valve housing 11).

  Here, the upper end of the connecting shaft 18 is connected to the internal thread portion formed in the lower inner periphery of a central hole (vertical through hole) 16a provided in the upper valve body 16 (along the vertical direction (axis O1 direction)). A male screw part formed on the outer periphery of the part is screwed and hermetically connected and fixed, and a central hole (vertical through hole) 17a provided in the lower valve body 17 (along the vertical direction (axis O1 direction)). The lower end of the connecting shaft 18 is fitted and fixed in an airtight manner by press fitting, caulking, or the like. The central hole 16a of the upper valve body 16 and the central hole 17a of the lower valve body 17 are provided with lateral holes 16b and 17b that open to the main valve chamber 12, respectively.

  As described above, the upper valve body 16 and the lower valve body 17 are integrally moved (via the connecting shaft 18) in the direction of the axis O1 in the main valve body 15, and the upper valve body 16 (of the The upper outer peripheral portion and the lower outer peripheral portion) are selectively brought into and out of contact with the sub-valve seat 29 and the one-end side main valve seat 27, and the lower valve body 17 (the outer peripheral portion thereof) is connected to the other end-side main valve. It comes in contact with and separates from the seat 28. Specifically, the main valve body 15 has its lower valve body 17 seated on the other end side main valve seat 28 when the upper valve body 16 is seated on the sub valve seat 29 and is separated from the one end side main valve seat 27. When the upper valve body 16 is separated from the sub valve seat 29 and is seated on the one end side main valve seat 27, the lower valve body 17 is separated from the other end side main valve seat 28. Thereby, as shown in FIG. 1, the upper valve body 16 (the upper outer peripheral portion thereof) is seated on the sub-valve seat 29 (the valve seat portion thereof), and the lower valve body 17 (the outer peripheral portion thereof) is the main end on the other end side. Sitting on the valve seat 28 (the valve seat portion thereof), the port pA and the port pF are communicated (via one end side main valve port of the one end side main valve seat 27), and the port pE and the communication path 86 are connected. One end (upper end) position (heating position) for communication and the upper valve body 16 (lower outer peripheral portion) as shown in FIG. 2 are seated on one end side main valve seat 27 (valve seat portion) and the lower valve The body 17 (the outer peripheral portion thereof) is separated from the other end side main valve seat 28 (the valve seat portion thereof), and the port pE and the port pF are connected via the other end side main valve port of the other end side main valve seat 28. ) The other end (lower end) that allows the port pA and the communication passage 85 to communicate with each other (via the auxiliary valve port of the auxiliary valve seat 29). Position is to obtain (cooling position) and selectively to take.

  When the main valve body 15 is at the other end position (cooling position), the port pE and the port pF communicate with the communication path 86, but each port provided in the communication path 86 and the flow path switching valve 50. Between the ports pB, pC, and pD, the main valve body 55 (the lower valve body 57) is seated on the sub valve seat 69 provided on the flow path switching valve 50 (the other end side of the port pD). It is designed not to communicate (the communication state is blocked) (detailed later).

  The one end-side piston 31 and the other end-side piston 32 are connected to the main valve body 15 via one end-side connecting shaft 38 and the other end-side connecting shaft 39, respectively, and can be moved integrally. In this example, the upper end of the one end side connecting shaft 38 is hermetically connected and fixed to the fitting hole 31a provided in the center of the one end side piston 31 by press fitting, caulking, welding, or the like, and the lower end of the one end side connecting shaft 38 is The upper valve body 16 is fitted and fixed in an airtight manner by being fitted into the upper portion of the central hole 16a of the upper valve body 16 by press fitting, caulking or the like. Further, the lower end of the other end side connecting shaft 39 is hermetically connected and fixed to the fitting hole 32a provided at the center of the other end side piston 32 by press fitting, caulking, welding, or the like. The male screw portion formed on the lower valve body 17 is screwed to the female screw portion formed on the inner periphery of the lower portion of the central hole 17a of the lower valve body 17, and is hermetically connected and fixed. As a result, the main valve body 15 is pushed by the one end side connecting shaft 38 and the other end side connecting shaft 39 in accordance with the reciprocating movement of the pair of upper and lower one end side and other end side pistons 31, 32, so that the cooling position (upper end) Position) and a heating position (lower end position).

  That is, in the flow path switching valve 10 in the present embodiment, the one end side working chamber 41, the one end side piston 31 having the one end side connecting shaft 38, the other end side piston 32 having the other end side connecting shaft 39, and the other end side working chamber. 42, a fluid pressure type actuator (in detail, a fluid pressure type using a differential pressure between the high pressure refrigerant and the low pressure refrigerant in the system) is configured to move the main valve body 15 in the direction of the axis O1 (vertical direction). Yes.

  In FIG. 4, the lower inner housing member 22, the other end side piston 32, the other end side connecting shaft 39 and the like are assembled and then inserted into the main valve housing 11. Of course, the other end side piston 32 and the other end side connecting shaft 39 may be assembled in a state where only the member 22 is inserted.

[Configuration of Channel Switching Valve 50]
The basic configuration of the flow path switching valve (second flow path switching valve) 50 disposed on the left 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 40 to the reference numerals of the respective parts of the flow path switching valve 10), and redundant description is omitted.

  This flow path switching valve 50 is basically composed of three ports (port pB, port pC, port pD) provided in the main valve housing 51 and the main valve housing 51 with respect to the flow path switching valve 10 described above. The arrangement configuration of the one end side main valve seat 67, the other end side main valve seat 68, and the sub valve seat 69 provided on the inner periphery is different.

  In the flow path switching valve 50, a main valve housing (valve housing) 51 includes three ports (one end side (upper end side), a fourth port pB, and a fifth port made of pipe joints extending leftward. pC and the sixth port pD) are vertically connected (lined in the direction of the axis O5) and hermetically connected by brazing or the like and opened to the main valve chamber (valve chamber) 52.

  Further, the communication passage 85 (the communication passage 85 communicating from the sub valve seat 29 of the main valve chamber 12 of the flow path switching valve 10 to one end side) is communicated laterally so as to face the port pB. The communication passage 86 (communication from the other end side main valve seat 28 of the main valve chamber 12 of the flow path switching valve 10 to the other end side from the port pD in the main valve chamber 52 to the other end (lower end) side. The communicating passage 86) communicates sideways.

  The upper inner housing member 61 inserted into the upper part (inner circumference) of the main valve housing 51 includes a short cylindrical member 61a that is relatively short in the direction of the axis O5 and a long cylinder that is relatively long in the direction of the axis O5. A two-part configuration with the shaped member 61b. The side (left side) of the short cylindrical member 61a is provided with an opening 63 corresponding to (connected to) the central port pC provided in the main valve housing 51, and from the lower end to the inside (axis line) The other end side main valve seat 68 with the inner end upper part serving as a valve seat portion protrudes (toward O5). On the other hand, on the side (left side) of the long cylindrical member 61b of the upper inner housing member 61, an opening 65 corresponding to the upper port pB provided in the main valve housing 51 is provided. Part) is provided with an opening 64 corresponding to (connected to) the communication passage 85, and from the lower end part toward the inside (toward the axis O5), one end side where the inner end lower part is the valve seat part. A main valve seat 67 is projected. The short cylindrical member 61a and the long cylindrical member 61b are hermetically sealed by welding or the like on the bowl-shaped portion (outer terrace) provided on the outer periphery of the lower cylindrical member 61b at the upper end of the short cylindrical member 61a. They are joined and connected together.

  On the other hand, an opening 66 corresponding to (connected to) the communication path 86 is provided on the side (right side) of the lower inner housing member 62 inserted in the lower part (inner circumference) of the main valve housing 51, A sub-valve seat 69 having a lower inner end serving as a valve seat portion projects from the upper end portion toward the inside (toward the axis O5).

  In other words, in the present embodiment, the upper and lower inner housing members 61 and 62 fitted in the main valve housing 51 have a lower inner end between the port pB and the port pC in the main valve chamber 52 and the valve seat portion. One end side main valve seat 67 is provided, and the other end side main valve seat 68 whose inner end upper part is a valve seat portion is provided between the port pC and the port pD in the main valve chamber 52, and the main valve In the chamber 52, a sub valve seat 69 is provided on the other end side from the port pD and one end side from the communication path 86 (in other words, between the port pD and the communication path 86). Yes.

  The poppet type main valve element (valve element) 55 disposed in the main valve chamber (valve chamber) 52 so as to be movable in the direction of the axis O5 (vertical direction) is, in this example, one end side of the main valve chamber 52. An upper valve body 56 disposed between the main valve seat 67 and the other end side main valve seat 68 and a lower valve body 57 disposed below the sub valve seat 69 in the main valve chamber 52 are provided. Then, the upper valve body 56 and the lower valve body 57 are moved together (via the connecting shaft 58), and the upper valve body 56 (the upper outer peripheral portion and the lower outer peripheral portion thereof) is the one end side main valve. The seat 67 and the other end side main valve seat 68 are selectively brought into contact with and separated from each other, and the lower valve body 57 (the outer peripheral portion thereof) is brought into contact with and separated from the sub-valve seat 69 in conjunction therewith. Specifically, when the upper valve body 56 is seated on the other end side main valve seat 68 and is separated from the one end side main valve seat 67, the lower valve body 57 is separated from the sub valve seat 69. When the upper valve body 56 is separated from the other end side main valve seat 68 and is seated on the one end side main valve seat 67, the lower valve body 57 is seated on the sub valve seat 69. Thereby, as shown in FIG. 1, the upper valve body 56 (the lower outer peripheral portion thereof) is seated on the other end side main valve seat 68 (the valve seat portion thereof) and the lower valve body 57 (the outer peripheral portion thereof) is Apart from the valve seat 69 (the valve seat portion thereof), the port pC and the port pB are communicated (via the one end side main valve port of the one end side main valve seat 67), and the port pD and the communication path 86 are connected ( The other end (lower end) position (heating position) to be communicated (via the auxiliary valve port of the auxiliary valve seat 69) and the upper valve body 56 (the upper outer peripheral portion thereof) as shown in FIG. 67 (the valve seat portion) and the lower valve body 57 (the outer peripheral portion thereof) is seated on the sub-valve seat 69 (the valve seat portion), and the port pC and the port pD are connected to the main valve seat on the other end side. 68 (the other end side main valve port) and one end (upper end) position for communicating the port pB and the communication passage 85. Is adapted can take cooling position) and selectively.

  When the main valve body 55 is in the other end position (heating position), the port pC and the port pB are also communicated with the communication path 85, but each port provided in the communication path 85 and the flow path switching valve 10 is provided. (Ports pA, pF, pE) communicate with each other by seating the main valve body 15 (the upper valve body 16) on the auxiliary valve seat 29 provided on the flow path switching valve 10 (one end side of the port pA). No (communication state is cut off).

  In this example, the diameters of the ports pA to pF provided in the flow path switching valves 10 and 50 and the diameters of the communication paths 85 and 86 are set to be substantially the same.

<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 55 arranged in the main valve housings 11 and 51 of the respective flow path switching valves 10 and 50 are in the heating position (the main valve body 15 of the flow path switching valve 10 is at one end (upper end) position, When the main valve body 55 of the path switching valve 50 is in the other end (lower end) position (first communication state as shown in FIG. 1), the flow path switching valve 10 is connected via a four-way pilot valve 90 described later. The one end side working chamber 41 and the other end side working chamber 82 of the flow path switching valve 50 are communicated with the port pA which is the discharge side high pressure port, and the other end side working chamber 42 and the flow path switching valve of the flow path switching valve 10 are connected. When one end side working chamber 81 of 50 is connected to the port pD which is a suction side low pressure port, a high-temperature and high-pressure refrigerant is added to the one end side working chamber 41 of the flow path switching valve 10 and the other end side working chamber 82 of the flow path switching valve 50. And the other end side working chamber 42 of the flow path switching valve 10 and the flow. High-temperature and high-pressure refrigerant is discharged from one working chamber 81 of the switching valve 50. Therefore, in the flow path switching valve 10, the pressure in the one end side working chamber 41 is higher than the pressure in the other end side working chamber 42, and the one end side and other end side pistons 31, 32 and the main valve body 15 move downward, The valve body 15 (the upper outer peripheral portion of the upper valve body 16 and the outer peripheral portion of the lower valve body 17) is separated from the auxiliary valve seat 29 (the valve seat portion thereof) and the other end side main valve seat 28 (the valve seat portion thereof). The sub valve port and the other end side main valve port are opened, and the main valve body 15 (the lower outer peripheral portion of the upper valve body 16) is seated on the one end side main valve seat 27 (the valve seat portion thereof) and engaged. Stopped. At the same time, in the flow path switching valve 50, the pressure in the other end side working chamber 82 becomes higher than the pressure in the one end side working chamber 81, and the one end side and lower end side pistons 71 and 72 and the main valve body 55 move upward. The main valve body 55 (the lower outer peripheral portion of the upper valve body 56) is separated from the other end side main valve seat 68 (the valve seat portion thereof), the other end side main valve port is opened, and the main valve body 55 (of the The upper outer peripheral portion of the upper valve body 56 and the outer peripheral portion of the lower valve body 57 are seated on the one end side main valve seat 67 (the valve seat portion thereof) and the auxiliary valve seat 69 (the valve seat portion thereof) and locked. The Thereby, the main valve bodies 15 and 55 of the respective flow path switching valves 10 and 50 are in the cooling position (the main valve body 15 of the flow path switching valve 10 is in the other end (lower end) position, and the main valve body of the flow path switching valve 50 is. 55 is one end (upper end position) (second communication state as shown in FIG. 2).

  As a result, the port pA in the flow path switching valve 10 and the port pB in the flow path switching valve 50 are communicated with each other via the communication path 85 provided therebetween, and the port pE and the port pF are connected in the flow path switching valve 10. Since the ports pC and pD are communicated with each other in the flow path switching valve 50, the cooling operation is performed in the heat pump air conditioning system 100 as shown in FIGS. 8A and 8B.

  When the main valve bodies 15 and 55 disposed in the main valve housings 11 and 51 of the respective flow path switching valves 10 and 50 are in the cooling position (second communication state as shown in FIG. 2), they will be described later. The other end side working chamber 42 of the flow path switching valve 10 and the one end side working chamber 81 of the flow path switching valve 50 are communicated with the port pA which is the discharge side high pressure port via the four-way pilot valve 90 which performs the flow path switching. When the one end side working chamber 41 of the valve 10 and the other end side working chamber 82 of the flow path switching valve 50 are communicated with the port pD which is the suction side low pressure port, the other end side working chamber 42 and the flow path of the flow path switching valve 10 are obtained. A high-temperature and high-pressure refrigerant is introduced into the one-end working chamber 81 of the switching valve 50, and a high-temperature and high-pressure refrigerant flows from the one-end working chamber 41 of the flow path switching valve 10 and the other-end working chamber 82 of the flow path switching valve 50. Discharged. Therefore, in the flow path switching valve 10, the pressure in the other end side working chamber 42 becomes higher than the pressure in the one end side working chamber 41, and the one end side and other end side pistons 31, 32 and the main valve body 15 move upward, The valve body 15 (the lower outer peripheral portion of the upper valve body 16) is separated from the one end side main valve seat 27 (the valve seat portion thereof) to open the one end side main valve port, and the main valve body 15 (the upper valve body 16 thereof). The upper outer peripheral portion of the lower valve body 17 and the outer peripheral portion of the lower valve body 17 are seated on the auxiliary valve seat 29 (the valve seat portion thereof) and the other end side main valve seat 28 (the valve seat portion thereof). At the same time, the pressure in the one end side working chamber 81 becomes higher than the other end side working chamber 82 in the flow path switching valve 50, and the one end side and other end side pistons 71, 72 and the main valve body 55 move downward, The main valve body 55 (the upper outer peripheral portion of the upper valve body 56 and the outer peripheral portion of the lower valve body 57) is separated from the one end side main valve seat 67 (the valve seat portion thereof) and the auxiliary valve seat 69 (the valve seat portion thereof). The one end side main valve port and the sub valve port are opened, and the main valve body 55 (the lower outer peripheral portion of the upper valve body 56) is seated on the other end side main valve seat 68 (the valve seat portion thereof) and engaged. Stopped. Thereby, the main valve bodies 15 and 55 of the respective flow path switching valves 10 and 50 are in the heating position (the main valve body 15 of the flow path switching valve 10 is at one end (upper end) position and the main valve body 55 of the flow path switching valve 50. Is the other end (lower end position) (first communication state as shown in FIG. 1).

  As a result, the port pA and the port pF are communicated with each other in the flow path switching valve 10, the port pC and the port pB are communicated with each other in the flow path switching valve 50, and the port pE and the flow path switching valve in the flow path switching valve 10 are communicated. 50 is connected to the port pD via the communication path 86 provided therebetween, so that the heating operation is performed in the heat pump cooling and heating system 100 as shown in FIGS. 8A and 8B.

  Here, in the present embodiment, the outer diameter (seat diameter) of the main valve body 15 (the upper and lower valve bodies 16, 17) in the flow path switching valve 10 is the upper and lower parts fitted in the main valve housing 11. Main valve body 55 (upper and lower valve bodies 56, 57) of the flow path switching valve 50 is made smaller than the inner diameter of the inner housing members 21, 22 (that is, the pressure receiving diameters of the one end side piston and the other end side piston 31, 32). The outer diameter (seat diameter) of the upper and lower inner housing members 61 and 62 fitted in the main valve housing 51 is made smaller than the inner diameter (that is, the pressure receiving diameters of the one end side and the other end side pistons 71 and 72). Therefore, when the flow path switching is performed (that is, when switching from the heating operation to the cooling operation and when switching from the cooling operation to the heating operation), each of the flow path switching valves 10 and 50 has a simple configuration. Main valve It has surely come to be to move the 15, 55.

<Configuration of four-way pilot valve 90>
The structure of the four-way pilot valve 90 as a pilot valve is well known. As shown in enlarged views in FIGS. 5 (A) and 5 (B), an electromagnetic wave is provided on the outer periphery of the base end side (left end side). A valve case 92 is formed of a cylindrical straight pipe to which a coil 91 is fitted and fixed. A suction element 95, a compression coil spring 96, and a plunger 97 are arranged in series on the valve case 92 in this order from the base end side. Be present.

  The left end portion of the valve case 92 is hermetically joined to the flange portion (outer peripheral terrace) of the attractor 95 by welding or the like, and the attractor 95 is attached to a 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 lid member 98 with a filter having a narrow tube insertion port (high pressure introduction port a) for introducing a high pressure refrigerant is hermetically attached to the right 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. On the valve seat surface (inner end surface), the one end side working chamber 41 of the flow path switching valve 10 and the other end side working chamber of the flow path switching valve 50 of the six-way valve body 9 are sequentially arranged from the front end side (right end side). 82, the port b connected through the narrow tube #b, the port c connected to the port (suction side low-pressure port) pD through the thin tube #c, the other end side working chamber 42 of the channel switching valve 10, and the channel A port d connected to one end side working chamber 81 of the switching valve 50 via a thin tube #d is opened side by side along the longitudinal direction (left-right direction) of the valve case 92 with a predetermined interval.

  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, c, and d opened on the valve seat surface of the valve seat 93. The valve seat surface slides as the plunger 97 moves in the left-right direction.

  Further, the valve body 94 is large enough to selectively communicate between the adjacent ports bc and cd among the three ports b to d opened on the valve seat surface of the valve seat 93. A recess 94a is provided.

  The compression coil spring 96 is compressed between the suction element 95 and the plunger 97 and urges the plunger 97 in a direction (rightward in the drawing) to separate the plunger 97 from the suction element 95. In the example, the valve seat 93 (the left end portion thereof) is a stopper that prevents the plunger 97 from moving to the right. It goes without saying that other configurations can be adopted as the configuration of the stopper.

  The four-way pilot valve 90 is attached to an appropriate location such as the back side of the six-way valve body 9 via an attachment 92A.

<Operation of the four-way pilot valve 90>
In the four-way pilot valve 90 configured as described above, when the energization of the electromagnetic coil 91 is turned off, as shown in FIGS. 1 and 5A, the plunger 97 is caused by the urging force of the compression coil spring 96. The right end is pushed and moved 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, and the port d and the valve chamber 99 communicate with each other. ) The high-pressure fluid flowing into pA is introduced into the other-end working chamber 42 and the one-end working chamber 81 via the high-pressure narrow tube # a → the valve chamber 99 → the port d → the narrow tube # d → the port p10b and the port p50a. The high pressure fluid in the one end side working chamber 41 and the other end side working chamber 82 flows from the port p10a and the port p50b → the narrow tube # b → the port b → the recess 94a → the port c → the narrow tube # c → the port (suction side low pressure port) pD. Discharged.

  On the other hand, when the energization to the electromagnetic coil 91 is turned on, the plunger 97 is positioned so that the left end of the plunger 97 comes into contact with the attractor 95 by the attracting force of the attractor 95 as shown in FIG. 2 and FIG. (Against the biasing force of the compression coil spring 96). At this time, the valve element 94 is positioned on the port c and the port d, and the port c and the port d communicate with each other by the recess 94a, and the port b and the valve chamber 99 communicate with each other. The high-pressure fluid flowing into the pA is introduced into the one-end working chamber 41 and the other-end working chamber 82 via the high-pressure narrow tube # a → the valve chamber 99 → the port b → the narrow tube # b → the port p10a and the port p50b. The high pressure fluid in the end side working chamber 42 and the one end side working chamber 81 flows from the port p10b and the port p50a → the narrow tube # d → the port d → the recess 94a → the port c → the narrow tube # c → the port (suction side low pressure port) pD. Discharged.

  Therefore, when energization to the electromagnetic coil 91 is turned off, the main valve bodies 15 and 55 of the flow path switching valves 10 and 50 of the six-way valve body 9 are changed from the cooling position (second communication state) to the heating position (first communication state). ) And the flow path switching as described above is performed, while the energization of the electromagnetic coil 91 is turned ON, the main valve bodies 15 and 55 of the flow path switching valves 10 and 50 of the six-way valve body 9 are heated. The position (first communication state) is shifted to the cooling position (second communication state), and the flow path switching is performed as described above.

  Thus, in the six-way switching valve 1 of the present embodiment, the high-pressure fluid (the port pA that is the high-pressure portion is circulated) through the six-way switching valve 1 by switching the energization to the electromagnetic four-way pilot valve 90 by ON / OFF. The main valve bodies 15 and 55 of the flow path switching valves 10 and 50 constituting the six-way valve body 9 by utilizing the differential pressure between the fluid flowing) and the low pressure fluid (fluid flowing through the port pD which is the low pressure portion). By moving the chambers 12 and 52 in conjunction with each other, the communication state between the six ports provided in total in the two flow path switching valves 10 and 50 is switched, as shown in FIGS. 8A and 8B. In the heat pump air conditioning system 100 as shown, 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, a plurality of ports pA to pF are connected to the main valve housings 11 and 51 by brazing or the like. 51, a valve seat (one end side main valve seats 27, 67, another end side main valve seats 28, 68, sub valve seats 29, 69) and a piston (one end side piston 31, 71, cylindrical inner housing members (upper inner housing members 21, 61, lower inner housing members 22, 62) provided with piston sliding surfaces 36, 37, 76, 77 in which the other end side pistons 32, 72) are in sliding contact. ) Is fitted, the deformation (distortion) of the main valve housings 11 and 51 that occurs when the ports pA to pF are connected by brazing or the like causes the valve seats and pistons to contact and separate the main valve bodies 15 and 55 to Piss sliding Since no longer affect the down sliding surface, it is possible to suppress the leakage valve reliably.

  Further, by moving the poppet type main valve bodies 15 and 55 within the main valve chambers 12 and 52 defined by the main valve housings 11 and 51, the ports to be communicated (communication state, flow path) are switched. Thus, for example, valve leakage can be more reliably suppressed as compared with a flow path switching valve using a conventional slide type main valve body.

  Further, for example, the inner housing members (upper inner housing members 21, 61, lower inner housing members 22, 62) are made of stainless steel, and the main valve housings 11, 51 are made of brass. The inner housing members to be fitted (upper inner housing members 21, 61, lower inner housing members 22, 62) are made of a material having lower thermal conductivity or higher rigidity (strength) than the main valve housings 11, 51. Therefore, heat exchange with the main valve housings 11 and 51 can be reduced, and deterioration due to wear or the like of the abutting portions and sliding portions can be suppressed, and this also allows the inner housing members (upper inner housing members 21, 61, Valve seats (one-end side main valve seats 27, 67, other-end side main valve seats 28, 68) provided in the lower inner housing members 22, 62) Since the deformation of the valve seat 29,69) and piston sliding surfaces 36,37,76,77 is suppressed, and improved durability, can hardly leaking further valve.

  In the above-described embodiment, the poppet-type main valve bodies 15 and 55 are moved in the main valve chambers 12 and 52 to switch between communicating ports (communication state, flow path). For example, even when a slide type main valve body as described in Patent Document 1 is used, it is needless to say that the same effect can be obtained.

  Further, in the above embodiment, the configuration in which the main valve bodies 15 and 55 are driven in the main valve chambers 12 and 52 by using the four-way pilot valve 90 or the like is employed. However, as an actuator unit for moving the main valve body, In addition to the configuration using the four-way pilot valve 90 or the like as described above, a configuration in which the main valve body is driven using a solenoid or a motor may be used.

  Further, in the six-way switching valve 1 of the above-described embodiment, the flow path switching valve 10 is provided with three ports (port pA, port pF, port pE) in the right direction, and the flow path switching valve 50 has three ports in the left direction. Ports (port pB, port pC, port pD) are provided, but it is needless to say that 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) pA, pF, pE provided in the flow path switching valve 10 and each port (pipe joint) pB, pC, pD provided in the flow path switching valve 50 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.

  In the six-way switching valve 1 of the above embodiment, the third port pE is attached to the main valve housing 11 of the flow path switching valve 10, and the fourth port pB is attached to the main valve housing 51 of the flow path switching valve 50. However, as shown in FIG. 6, the third port pE is attached to the communication passage 86 (in place of the main valve housing 11 of the flow path switching valve 10), and the fourth port pB is connected to the main path of the flow path switching valve 50. It goes without saying that the same effect can be obtained even if it is attached to the communication passage 85 (instead of the valve housing 51). Further, as shown in FIG. 7, the communication passage 85 (the left end thereof) is attached to the fourth port pB (in place of the main valve housing 51 of the flow path switching valve 50), and the communication passage 86 (the right end thereof) is connected to the (flow end). Needless to say, the same effect can be obtained even if it is attached to the third port pE (instead of the main valve housing 11 of the path switching valve 10). In FIG. 7, the fourth port pB is connected to the right part of the main valve housing 51 (flow path switching valve 10 side), and the third port pE is connected to the left part of the main valve housing 11 (flow path switching valve 50 side). ).

  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 Six-way switching valve 9 Six-way valve body 10, 50 Flow path switching valve 11, 51 Main valve housing (valve housing)
12, 52 Main valve chamber (valve chamber)
13, 53 Stepped portion 15, 55 Main valve element (valve element)
16, 56 Upper valve body 17, 57 Lower valve body 18, 58 Connecting shaft 21, 61 Upper inner housing member (inner housing member)
22, 62 Lower inner housing member (inner housing member)
27, 67 One end side main valve seat 28, 68 The other end side main valve seat 29, 69 Sub valve seat 31, 71 One end side piston 32, 72 The other end side piston 36, 37, 76, 77 Piston sliding surfaces 38, 78 One end side connecting shaft 39, 79 The other end side connecting shaft 41, 81 One end side working chamber 42, 82 The other end side working chamber 85, 86 Communication passage 90 Four-way pilot valve pA, pB, pC, pD, pE, pF Port

Claims (9)

A valve housing defining a valve chamber, wherein a plurality of ports are opened in the valve chamber, a valve body is movably disposed, and is connected to the valve body for moving the valve body; A flow path switching valve provided with an actuator portion having a piston, wherein the communication state between the ports is switched by moving the valve body in the valve chamber by the actuator portion,
The plurality of ports are connected to the valve housing and a cylindrical inner housing member is fitted therein, and the valve body is brought into contact with and separated from the inner housing member so as to switch the communication state between the ports. A flow path switching valve, characterized in that a valve seat is provided and the piston connected to the valve body is slidably disposed in an axial direction.   The flow path switching valve according to claim 1, wherein the valve body is a poppet type valve body.   3. The flow path switching valve according to claim 1, wherein an end portion of the inner housing member is brought into contact with a stepped portion provided on an inner periphery of the valve housing.   The flow path switching valve according to claim 3, wherein the valve seat is provided at the end of the inner housing member.   The flow path switching valve according to any one of claims 1 to 4, wherein the inner housing member is made of a material having a lower thermal conductivity than the valve housing.   The flow path switching valve according to any one of claims 1 to 5, wherein the inner housing member is made of a material having higher rigidity than the valve housing.   The flow path switching valve according to claim 5 or 6, wherein the inner housing member is made of stainless steel, and the valve housing is made of brass.   The flow path switching valve according to any one of claims 1 to 7, wherein the plurality of ports are connected to the valve housing by brazing. A valve housing defining a valve chamber, wherein a plurality of ports are opened in the valve chamber, a valve body is movably disposed, and is connected to the valve body for moving the valve body; An assembly method of a flow path switching valve comprising an actuator portion having a piston, wherein the communication state between each port is switched by moving the valve body in the valve chamber by the actuator portion. ,
Connecting the plurality of ports to the valve housing;
The valve housing to which the plurality of ports are connected is provided with a valve seat for contacting and separating the valve body so as to switch the communication state between the ports, and the piston to which the valve body is coupled is disposed in an axial direction. And a step of internally fitting and fixing a cylindrical inner housing member slidably disposed.

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