JP2007078119A - Flow path selector valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow path selector valve capable of preventing a working fluid from leaking even if the easily leaking direction of a seal is changed and assembled easily. <P>SOLUTION: A seal member 48R and a plate spring 46R held between a reinforcement plate 50R and a guide member 44R forming a part of a piston member are fastened to a connection plate 52 with small screws B<SB>0</SB>. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flow path switching valve having a seal unit and having a reciprocating piston member.

  In a refrigerant circulation circuit in an air conditioner or the like, generally, a pilot valve and a flow path switching valve for opening and closing a flow path are practically used. For example, as shown in Patent Documents 1 and 2, the flow path switching valve (reversible valve) is a flow path on the high-pressure side or low-pressure side in the compressor in the refrigerant circulation circuit in which a heat exchanger, a compressor, and the like are arranged. Is arranged.

  The flow path switching valve has a first chamber, a third chamber, and a second chamber connected to the open end of the flow path as described above, to which a working fluid of a predetermined pressure is selectively supplied. I have. The first chamber, the second chamber, and the third chamber are each divided by a piston member that is supported so as to be able to reciprocate in a direction crossing the flow path. The second chamber formed by the piston member between the first chamber and the third chamber is connected to and communicated with the open end of the flow path. A valve body that opens and closes the open end of the flow path is provided at the center of the piston member. In addition, a seal unit that isolates the first chamber and the second chamber and a seal unit that isolates the third chamber and the second chamber are provided at both ends of the piston member, respectively. Yes.

  With such a configuration, the piston member is reciprocated according to the difference between the pressure of the working fluid supplied to the first chamber and the pressure of the working fluid supplied to the third chamber, and the valve body flows. When the open end of the path is closed, for example, the supply of the refrigerant is blocked, while when the valve element opens the open end of the flow path, the refrigerant can be supplied.

  As shown in Patent Document 1, a seal unit improved against leakage of working fluid is, for example, a rivet or the like on opposite surfaces of a plate-like member so that the inward or outward seal members are back to back. It is fixed by. The plate-like member is connected to the end of the piston member via a connecting member.

Japanese Patent No. 3256270 Japanese Utility Model Publication No. 2-102083

  Since the sealing unit improved with respect to the leakage of the working fluid as described above requires two sealing members at each end of the piston member, the number of parts constituting the entire piston member is relatively large. As a result, there is a problem that the assembly becomes complicated.

  In view of the above problems, the present invention is a flow path switching valve having a seal unit having a reciprocating piston member, and the working fluid does not leak even if the direction in which the seal is likely to leak is switched. An object of the present invention is to provide a flow path switching valve that can be easily assembled.

  In order to achieve the above object, a flow path switching valve according to the present invention has a valve body, and the flow path switching valve is connected to a pilot valve that controls switching of the flow path of the valve body. A first chamber and a third chamber in which a working fluid is supplied into the main body via the pilot valve, and a flow in the valve body disposed adjacent to at least one of the first chamber and the third chamber. A second chamber in which the opening end of the path is opened and closed, and a piston member having a seal unit at least at one location corresponding to a boundary portion of each room and having a valve body for opening and closing the opening end. The seal unit includes a seal member having a seal surface forming a part of a substantially V-shaped cross section at an outer peripheral edge.

  In addition, the flow path switching valve according to the present invention is connected to a portion where the working fluid has a pressure difference in the supply path to which the working fluid is supplied, and expands or contracts in accordance with the pressure difference of the working fluid. And a second chamber arranged adjacent to the first chamber and the third chamber and connected to an open end of the supply path, and the first chamber and the third chamber, And a piston member having a valve body that opens and closes the opening end of the supply passage, and has a part of a substantially V-shaped cross section. It comprises a sealing member having a sealing surface formed on the outer peripheral edge.

  Furthermore, the seal unit may further include a biasing member that biases the outer peripheral edge of the seal member against the wall surface forming the second chamber. The seal surface of the seal unit may be formed with an outer peripheral edge continuous with a waveform.

  The flow path switching valve according to the present invention has a valve body, and is a flow path switching valve connected to a pilot valve that controls switching of the flow path of the valve body. The first chamber and the third chamber to which the working fluid is supplied and at least one of the first chamber and the third chamber are arranged adjacent to each other, and the opening end of the flow path in the valve body is opened and closed. A second chamber and a piston member having a valve unit that opens and closes the opening end, and has a seal unit at least at one location corresponding to a boundary portion between the chambers. It comprises a sealing member having a seal surface with a letter-shaped cross section or a substantially N-shaped cross section at the outer peripheral edge.

  The seal member and the urging member in the seal unit may be supported while being sandwiched between the reinforcing plate and the guide member.

  As is apparent from the above description, according to the flow path switching valve of the present invention, the seal unit includes a seal member including a seal member having a seal surface that forms a part of a substantially V-shaped cross section at the outer peripheral edge. Therefore, the working fluid does not leak even if the direction in which the seal is likely to leak is switched, and it can be easily assembled.

  FIG. 2 schematically shows the configuration of the first embodiment of the flow path switching valve according to the present invention together with the pilot valve.

  In FIG. 2, the flow path switching valve 40 is disposed in a refrigeration apparatus including a compressor, a heat exchanger (evaporator, condenser), an expansion valve, and the like (not shown), for example. The pilot valve 10 and the flow path switching valve 40 for selectively stopping the circulation of the refrigerant in the refrigerant supply circuit of the refrigeration apparatus are disposed, for example, on the high pressure side of the compressor. The flow path switching valve 40 may be arranged on the low pressure side of the compressor.

  The port 22p1 of the pilot valve 10 is connected to the high pressure side (discharge side) of the compressor via a connection pipe 26, for example. That is, the other end of the connection pipe 26 connected to the port 22p1 is connected to a high-pressure side pipe in a compressor (not shown).

  The pilot valve 10 is, for example, electromagnetically driven, and a slide valve 33 that switches a formed flow path, a rod 24, a valve assembly that includes a plunger 16, and a valve assembly that is movable inside. A valve body 22, a magnetic plunger 16 connected to one end of the valve assembly and excited by a solenoid coil 14, which will be described later, a coil spring 20 that biases the valve assembly in one direction, and the plunger 16 are surrounded. And a solenoid coil 14 arranged as a main element.

  The plunger 16 is movably disposed inside the solenoid coil 14 and is biased in a direction away from the attractor 18 by a coil spring 20 disposed between the attractor 18 and the plunger 16.

  When the solenoid coil 14 is excited based on a drive current from a control circuit (not shown), the plunger 16 approaches the attractor 18 against the biasing force of the coil spring 20 as shown in FIG. When the solenoid coil 14 is not excited, the plunger 16 is biased in a direction away from the attractor 18 by the biasing force of the coil spring 20, as shown in FIG.

  One end of the valve body 22 is connected to the casing 12 that houses the solenoid coil 14. The valve body 22 is formed with a port 22p1 to which one end of the connection pipe 26 described above is connected. The above-described valve assembly is movably disposed inside the port 22p1. Ports 22p2, 22p3, and 22p4, to which one ends of connection pipes 28, 31, and 32 are respectively connected, are provided in parallel at a portion of the valve body 22 that faces the port 22p1. The other ends of the connection pipes 28 and 32 communicate with the insides of a first chamber 40A and a third chamber 40C of a flow path switching valve 40 described later, respectively. The other end of the connection pipe 31 is connected to the low pressure side (suction side) of the above-described compressor.

  The part opposite to the ports 22p2, 22p3 and 22p4 at one end of the valve assembly has a slide valve 33 provided with a recess for selectively communicating two of the three ports with each other. ing. That is, at the position shown in FIG. 2 where the solenoid coil 14 is not excited, the port 22p2 and the port 22p3 communicate with each other through the recess of the slide valve 33 of the valve assembly. As a result, the port 22p1 and the port 22p4 communicate with each other. On the other hand, at the position shown in FIG. 3 where the solenoid coil 14 is excited, the port 22p3 and the port 22p4 are communicated with each other by the concave portion of the slide valve 33 of the valve assembly. As a result, the port 22p1 and the port 22p2 communicate with each other.

  Therefore, when the solenoid coil 14 is selectively excited, the flow path from the port 22p1 to the port 22p4 is switched to the flow path from the port 22p1 to the port 22p2.

  The flow path switching valve 40 includes a first chamber 40A, a second chamber 40B, and a third chamber 40C that are partitioned by a piston member, which will be described later, in the casing 42 thereof. The volumes of the first chamber 40A and the third chamber 40C are enlarged or reduced according to the movement of the piston member based on the differential pressure. As shown in FIG. 2, the first chamber 40 </ b> A is formed by the inner peripheral portion of the casing 42 and the left end face of the piston member. The third chamber 40C is formed by the inner peripheral portion of the casing 42 and the right end surface of the piston member.

  The other end of the connection pipe 28 is connected to the first chamber 40A, and the other end of the connection pipe 32 is connected to the third chamber 40C.

  The second chamber 40B formed adjacently between the first chamber 40A and the third chamber 40C includes an opening end of the flow path 30 and an opening end of the flow path 34 in the refrigerant supply circuit described above. Are connected to each other.

  The second chamber 40B is formed by being surrounded by both end faces of the piston member and the inner peripheral portion of the casing 42 so as to be substantially orthogonal to the direction in which the flow paths 30 and 34 extend. The piston member is arranged to be able to reciprocate with respect to the inner peripheral portion of the casing 42.

  The piston member includes a connecting plate 52 having a valve body 56 and seal units to be described later connected to both ends of the connecting plate 52.

  The connecting plate 52 arranged so as to be substantially orthogonal to the extending direction of the flow path 30 has a valve body 56 at the center thereof. As shown in FIG. 2, the valve body 56 is slidably disposed between the valve seat 54A and the valve seat 54B where the open end of the flow path 30 and the open end of the flow path 34 are respectively disposed. Has been. Thereby, when the valve body 56 is disposed between the open end of the flow path 30 and the open end of the flow path 34 as shown in FIG. 2, the flow path 30 and the flow path 34 are blocked. The Rukoto. On the other hand, as shown in FIG. 3, when the valve body 56 is located at a position spaced from the opening end of the flow path 30 and the opening end of the flow path 34, the opening end of the flow path 30 and the opening of the flow path 34 are The ends communicate with each other through a hole 52 a formed in the connecting plate 52 adjacent to the valve body 56.

  The pair of seal units are symmetrically connected to both ends of the connecting plate 52 and have the same structure as each other, so only the right side will be described, and the description of the left side seal unit will be omitted.

  As shown in an enlarged view in FIG. 1, the seal unit includes a reinforcing plate 50R fastened to one end portion of the connecting plate 52 with a small screw Bo, a seal member 48R, a plate spring 46R as an urging member, and a guide. The member 44R is configured to be included. The left seal unit also includes a reinforcing plate 50L fastened to the other end of the connecting plate 52 with a plurality of small screws Bo, a seal member 48L, a plate spring 46L as an urging member, and a guide member 44L. Has been.

  The flat central portion of the reinforcing plate 50R made of a stainless steel plate and having a truncated cone shape is in contact with one end face of the connecting plate 52, and the small screw Bo is passed through the seal member 48R, the leaf spring 46R, and the guide member 44R. It is concluded. The outer peripheral edge portion of the reinforcing plate 50R is bent toward the valve body 56 at a predetermined inclination angle. A predetermined gap is formed between the outermost end face of the reinforcing plate 50 </ b> R and the inner peripheral face of the casing 42.

  As shown in FIGS. 4A and 4B, a flat surface 48f is formed at the center of the sealing member 48R made of a fluororesin in a disc shape, and a reinforcing plate is provided at the outer peripheral edge. A slope portion corresponding to the outer peripheral edge portion of 50R is formed. As a result, a recess 48r is formed on the left side of the seal member 48R.

  Further, as shown in FIG. 1, a predetermined gap is formed between the inclined surface portion of the seal member 48R and the outer peripheral edge portion of the reinforcing plate 50R.

  Further, a seal surface 48 s is formed on the outer peripheral surface of the seal member 48 </ b> R that is continuous with the slope portion so as to slidably contact the inner peripheral surface of the casing 42. The working fluid does not leak out even if the seal leaking direction is switched between the second chamber 40B and the third chamber 40C by the seal surface 48s, so the second chamber 40B and the third chamber 40C Will be isolated.

  As a result, a folded portion having a substantially V-shaped cross-sectional shape is formed at the periphery of the flat surface 48f. Further, a concave portion 48p into which the outer peripheral edge of the leaf spring 46R is inserted is formed on the right side portion of the peripheral edge of the flat surface 48f.

  The leaf spring 46R made of stainless steel plate is made like a star washer, and has an annular bent portion that urges the seal surface 48s of the seal member 48R toward the inner peripheral surface of the casing 42 with a predetermined pressure. ing. The leaf spring 46R and the seal member 48R are sandwiched between the reinforcing plate 50R and the guide member 44R, and the small screw Bo passes through a common straight hole (not shown) to connect the connecting plate 52. It is supported by being fastened to the end of the. A predetermined gap is formed between the outer peripheral surface of the guide member 44 </ b> R and the inner peripheral surface of the casing 42.

  Therefore, the seal unit is simply assembled and fastened to both ends of the connecting plate 52 by the common small screw Bo with the leaf spring 46R and the seal member 48R interposed between the reinforcing plate 50R and the guide member 44R. Can do.

  In such a configuration, when the solenoid coil 14 in the pilot valve 10 is excited, the port 22p3 and the port 22p4 communicate with each other through the concave portion of the slide valve 33 as shown in FIG. Thereby, since the port 22p1 and the port 22p2 communicate, the pressure of the first chamber 40A in the flow path switching valve 40 becomes larger than the pressure of the third chamber 40C. Therefore, as the volume of the first chamber 40A increases and the volume of the third chamber 40C decreases, as shown in FIG. 3, the piston member changes from the state shown in FIG. 3 to the state shown in FIG. Moved to. As a result, the valve body 56 is separated from the open ends of the flow paths 30 and 34 so that the open ends of the flow paths 30 and 34 are opened, and the flow paths 30 and 34 communicate with each other.

  On the other hand, when the solenoid coil 14 in the pilot valve 10 is not energized, the port 22p2 and the port 22p3 communicate with each other due to the concave portion of the slide valve 33, so that the port 22p1 and the port 22p4 communicate with each other. As a result, the pressure in the third chamber 40C becomes larger than the pressure in the first chamber 40A, so that the piston member is moved from the state shown in FIG. 3 to the state shown in FIG. As a result, the valve body 56 is brought close to the open ends of the flow paths 30 and 34 so that the open ends of the flow paths 30 and 34 are closed by the valve body 56, and the flow paths 30 and 34 are blocked. Become.

  FIG. 5 shows a main part of the configuration of the seal unit used in the second embodiment of the flow path switching valve according to the present invention.

  Also in the second embodiment of the flow path switching valve according to the present invention, except for the configuration of the seal unit, the pilot valve and flow similar to the pilot valve 10 and the flow path switching valve 40 provided in the first embodiment described above. A path switching valve is provided. In FIG. 5, components that are the same in the examples shown in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description thereof is omitted.

  Also in the second embodiment of the flow path switching valve according to the present invention, the same seal unit is disposed at both ends of the piston member movably disposed in the casing of the flow path switching valve. FIG. 5 shows a seal unit on the right end side of the piston member.

  As shown in an enlarged view in FIG. 5, the seal unit includes a reinforcing plate 60, a seal member 62, a leaf spring 64, an inner seal 66, and a guide member 44 </ b> R that are fastened to the end portion of the connecting plate 52 with a small screw Bo. It is composed including the main elements.

  The flat central portion of the reinforcing plate 60 made of a stainless steel plate abuts on one end surface of the connecting plate 52 and is fastened to one end surface with a small screw Bo via the inner seal 66, the leaf spring 64, and the guide member 44R. Has been. The outer peripheral edge of the reinforcing plate 60 is bent and protrudes toward the valve body. Thus, an annular space surrounded by the inner peripheral portion of the casing 42 is formed between the outer peripheral edge portion of the reinforcing plate 60 and the opposing portion of the guide member 44R, and the sealing member is formed in the annular space. 62 is arranged. That is, the seal member 62 is arranged in an annular space surrounded by the inner peripheral portion of the casing 42 between the bent portion of the reinforcing plate 60 and the opposing portion of the guide member 44R. Further, a predetermined gap is formed between the outermost end surface of the reinforcing plate 60 and the inner peripheral surface of the casing 42.

  The annular seal member 62 is made of, for example, a fluororesin, and as shown in FIGS. 6A and 6B, a hole 62a is formed at the center, and the annular portion of the seal member 62 is The reinforcing plate 60 is formed with a dimension corresponding to the height of the bent portion of the outer peripheral edge portion. The annular portion of the seal member 62 has a substantially S-shaped (or N-shaped) cross-sectional shape. Accordingly, a recess 62p into which an outer peripheral edge of a leaf spring 64 described later is inserted is formed on the right side of the seal member 62. On the other hand, a recess 62 r is formed on the left side of the seal member 62. Further, the inner peripheral surface portion of the seal member 62 is in contact with the bent portion of the reinforcing plate 60 so as to seal the second chamber.

  Further, a seal surface 62 s is formed on the outer peripheral surface of the seal member 62 so as to isolate the rooms from each other while being in sliding contact with the inner peripheral surface of the casing 42.

  In the hole 62a of the seal member 62, for example, an inner seal 66 made of a fluorine resin in a disc shape is disposed.

  The leaf spring 64 made of a stainless steel plate is made like a star washer, and has an annular bent portion that urges the seal surface 62s of the seal member 62 toward the inner peripheral surface of the casing 42 with a predetermined pressure. ing. The leaf spring 64 and the inner seal 66 are sandwiched between the above-described reinforcing plate 60 and the guide member 44R, and the above-described machine screw Bo passes through a hole on a common straight line (not shown), and the connecting plate 52 It is supported by being fastened to the end of the. A predetermined gap is formed between the outer peripheral surface of the guide member 44 </ b> R and the inner peripheral surface of the casing 42.

  Accordingly, the seal unit is simply provided at both ends by the common small screw Bo of the connecting plate 52 with the seal member 62, the leaf spring 64, and the inner seal 66 interposed between the reinforcing plate 60 and the guide member 44R. Can be fastened.

  In the above example, the inner seal 66 is used, but instead, a sealing agent for screwing or the like may be used.

  FIG. 7 shows a main part of the configuration of the seal unit used in the third embodiment of the flow path switching valve according to the present invention.

  Also in the third embodiment of the flow path switching valve according to the present invention, except for the configuration of the seal unit, the pilot valve and flow similar to the pilot valve 10 and the flow path switching valve 40 provided in the first embodiment described above. A path switching valve is provided. In FIG. 7, components that are the same in the examples shown in FIGS. 1 and 2 are given the same reference numerals, and redundant description thereof is omitted.

  Also in the third embodiment of the flow path switching valve according to the present invention, the same seal unit is disposed at both ends of the piston member movably disposed in the casing of the flow path switching valve. FIG. 7 shows a seal unit on the right end side of the piston member.

  As shown in an enlarged view in FIG. 7, the seal unit is configured to include a reinforcing plate 70, a seal member 72, a leaf spring 74, and a guide member 44 </ b> R that are fastened to the end portion of the connecting plate 52 with a small screw Bo. ing.

  A flat central portion of the reinforcing plate 70 made of a stainless steel plate and having a truncated cone shape is in contact with one end face of the connecting plate 52, and is tightened with a small screw Bo via a seal member 72, a leaf spring 74, and a guide member 44R. It is fastened to one end face. The outer peripheral edge of the reinforcing plate 70 is bent at a predetermined inclination angle toward the valve body. A predetermined gap is formed between the outermost end surface of the reinforcing plate 70 and the inner peripheral surface of the casing 42.

  As shown in FIGS. 8A and 8B, a flat surface 72f is formed at the center of the sealing member 72 made of a fluororesin in a disc shape, and a reinforcing plate is provided at the outer peripheral edge. A slope portion corresponding to the outer peripheral edge portion of 70 is formed. As a result, a recess 72r is formed on the left side of the seal member 72. Further, the slope portion of the seal member 72 is arranged with a predetermined slight gap with respect to the bent portion of the reinforcing plate 70. With this configuration, when the pressure of the working fluid acts on the gap, the slope portion of the seal member 72 spreads outward toward the inner wall surface and performs self-sealing.

  Furthermore, seal surfaces 72S1 and 72S2 are formed on the outer peripheral surface of the seal member 72 that is continuous with the inclined surface portion so as to be in slidable contact with the inner peripheral surface of the casing 42 and isolate each room. That is, a substantially V-shaped cross-sectional portion is formed on the periphery of the flat surface 72f. Thereby, the recessed part 72p in which the outer periphery of the leaf | plate spring 74 is inserted in the right side part in the periphery of the flat surface 72f will be formed.

  The leaf spring 74 made of a stainless steel plate is made like a star washer, and has an annular bent portion that urges the seal surfaces 72S1 and 72S2 of the seal member 72 toward the inner peripheral surface of the casing 42 with a predetermined pressure. Have. The leaf spring 74 and the seal member 72 are sandwiched between the reinforcing plate 70 and the guide member 44R, and the small screw Bo passes through a hole on a common straight line (not shown) to connect the connecting plate 52. It is supported by being fastened to the end of the. A predetermined gap is formed between the outer peripheral surface of the guide member 44 </ b> R and the inner peripheral surface of the casing 42.

  Therefore, the seal unit can be easily fastened to both ends of the connecting plate 52 by the common machine screw Bo with the leaf spring 74 and the seal member 72 interposed between the reinforcing plate 70 and the guide member 44R. it can.

  In addition, although each Example of the flow-path switching valve based on this invention is applied to the refrigerant | coolant supply circuit in a refrigerator, it is not restricted to such an example, Even if it applies to other types of air conditioners etc. Of course it is good. In addition, the seal unit in each of the above-described embodiments is applied to two flow path switching valves including a piston member. However, the seal unit is not limited to such an example. One or four-way flow switching valves may be applied.

  Further, in the second embodiment described above, the substantially S-shaped seal member is fastened to the connecting plate with a small screw in a state of being sandwiched between the reinforcing plate and the guide member. For example, when the seal housing is bonded to the connecting plate, the seal member may be disposed in the annular groove of the seal housing.

  The material of the seal member and the inner seal in the above example is not limited to the fluorine-based resin, and for example, a material appropriately corresponding to the specification of the system to be applied may be appropriately selected. Further, the leaf spring in the above example is not limited to the stainless steel plate, but may be another metal material having elasticity.

  9 and 10 schematically show the configuration of the fourth embodiment of the flow path switching valve according to the present invention.

  In the example shown in FIG. 2, the flow path switching valve 40 is a two-way valve that opens and closes the flow path according to the differential pressure between a plurality of chambers formed on both sides of a piston member including a pair of seal units. is there. On the other hand, in the example shown in FIG. 9, the flow path switching valve 80 has a differential pressure between a plurality of chambers formed on one end side of a piston member having only one seal unit as described above at one end. It is a three-way valve that switches the flow path accordingly. Also in the example shown in FIG. 9, the flow path switching valve 80 is connected to the pilot valve 10 in the same manner as in the above example.

  9 and 10, the same components in the examples shown in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description thereof is omitted.

  In FIG. 9, the flow path switching valve 80 includes a first chamber 80A, a second chamber 80B, and a third chamber 80C defined by a piston member and a partition wall 86, which will be described later, in the casing 82 thereof. Yes. The volumes of the first chamber 80A and the third chamber 80C are enlarged or reduced according to the movement of the piston member based on the differential pressure. As shown in FIG. 9, the first chamber 80A is formed by the inner peripheral portion of the casing 82 and the end face of the guide member 44L provided at the left end of the piston member. The third chamber 80 </ b> C is formed by being surrounded by the reinforcing plate 50 </ b> L of the piston member and the wall surface of the partition wall 86 on the inner peripheral portion of the casing 82 and the inner peripheral portion of the casing 82.

  The partition wall 86 is provided at a substantially central portion of the inner peripheral portion of the casing 82 so as to partition the third chamber 80C and the second chamber 80B. The partition wall 86 has a hole through which the piston rod 84 of the piston member passes. A seal member 88 through which the piston rod 84 passes is provided at the periphery of the hole. By this seal member 88, the third room 80C and the second room 80B are isolated from each other without communicating with each other.

  The other end of the connection pipe 28 is connected to the first chamber 80A, and the other end of the connection pipe 32 is connected to the third chamber 80C.

  In the second chamber 80B formed through the partition wall 86 adjacent to the third chamber 80C, the opening end of the flow path 30 and the opening end of the flow path 34 in the above-described refrigerant supply circuit face each other. Connected. Further, the open ends of the other flow paths 35 are juxtaposed adjacent to the open ends of the flow paths 34.

  The second chamber 80B is formed so as to be surrounded by the wall surface of the partition wall 86 and the inner peripheral portion of the casing 82 so as to be substantially orthogonal to the extending direction of the flow paths 30, 34 and 35.

  The piston member that partitions between the first chamber 80 </ b> A and the third chamber 80 </ b> C is disposed so as to be capable of reciprocating with respect to the inner peripheral portion of the casing 82.

  The piston member includes a piston rod 84 having a valve body 90 at one end and the above-described seal unit connected to the other end of the piston rod 84.

  The piston rod 84 is disposed across the partition wall 86 between the third chamber 80C and the second chamber 80B.

  The valve body 90 of the piston rod 84 arranged so as to be substantially orthogonal to the extending direction of the flow path 30 is between the open end of the flow path 30 and the open end of the above-described flow path 34, etc. The open end of the flow path 34 and the open end of the flow path 35 are slidably disposed on the surface of the valve seat. Thereby, when the valve body 90 is disposed between the open end of the flow path 30 and the open end of the flow path 34 as shown in FIG. 9, the flow path 30 and the flow path 34 are blocked from each other. In addition, the flow path 30 and the flow path 35 communicate with each other. On the other hand, when the valve body 90 is between the open end of the flow path 30 and the open end of the flow path 35 as shown in FIG. The gap is blocked, and the flow path 30 and the flow path 34 communicate with each other.

  In such a configuration, when the solenoid coil 14 in the pilot valve 10 is excited, the port 22p3 and the port 22p4 communicate with each other through the recess of the slide valve 33 as shown in FIG. As a result, the port 22p1 and the port 22p2 communicate with each other, so that the pressure in the first chamber 80A in the flow path switching valve 80 becomes larger than the pressure in the third chamber 80C. Accordingly, as the volume of the first chamber 80A increases and the volume of the third chamber 80C decreases, the piston member changes from the state shown in FIG. 9 to the state shown in FIG. 10, as shown in FIG. Moved to. As a result, the valve body 90 is slid so that the open ends of the flow paths 30 and 34 are opened, the flow paths 30 and 34 communicate with each other, and the flow path 30 and the flow path 35 are blocked. It will be.

  On the other hand, when the solenoid coil 14 in the pilot valve 10 is not energized, the port 22p2 and the port 22p3 communicate with each other due to the concave portion of the slide valve 33, so that the port 22p1 and the port 22p4 communicate with each other. As a result, the pressure in the third chamber 80C becomes larger than the pressure in the first chamber 80A, so that the piston member is moved from the state shown in FIG. 10 to the state shown in FIG. As a result, the open ends of the flow paths 30 and 35 are released, and the valve body 90 is slid so that the open end of the flow path 34 is closed. Thereby, the flow paths 30 and 34 are blocked, and the flow paths are switched so that the flow paths 30 and 35 communicate with each other.

  In the above-described fourth embodiment, the seal unit includes the reinforcing plate 50L, the seal member 48L, the leaf spring 46L as the biasing member, and the guide member 44L. However, the present invention is not limited to such an example. Instead, for example, a seal unit shown in FIGS. 5 and 7 may be provided.

It is a fragmentary sectional view which shows the principal part in 1st Example of the flow-path switching valve which concerns on this invention. It is a block diagram which shows the structure of 1st Example of the flow-path switching valve based on this invention with a pilot valve. FIG. 3 is a diagram for explaining an operation in the example shown in FIG. 2. (A) is a top view which shows the sealing member used for the example shown by FIG. 2, (B) is a side view of the example shown by (A). It is a fragmentary sectional view which shows the principal part in 2nd Example of the flow-path switching valve concerning this invention. (A) is a top view which shows the sealing member used for the example shown by FIG. 5, (B) is a side view of the example shown by (A). It is a fragmentary sectional view which shows the principal part in 3rd Example of the flow-path switching valve concerning this invention. (A) is a top view which shows the sealing member used for the example shown by FIG. 7, (B) is a side view of the example shown by (A). It is a block diagram which shows the structure of 4th Example of the flow-path switching valve based on this invention with a pilot valve. FIG. 10 is a diagram provided for explaining operations in the example shown in FIG. 9.

Explanation of symbols

40, 80 Channel switching valve 42 Casing 44R Guide members 46R, 64, 74 Leaf springs 48R, 62, 72 Seal members 50R, 60, 70 Reinforcing plate 52 Connecting plate

Claims (7)

In a flow path switching valve having a valve body and connected to a pilot valve that controls switching of the flow path of the valve body,
The valve body is disposed adjacent to at least one of the first chamber and the third chamber and the first chamber and the third chamber to which the working fluid is supplied via the pilot valve. A second chamber in which the open end of the flow path is opened and closed,
A piston member having a seal unit at least at one location corresponding to a boundary portion of each room, and having a valve body that opens and closes the open end, and
The flow path switching valve according to claim 1, wherein the seal unit includes a seal member having a seal surface that forms a part of a substantially V-shaped cross section at an outer peripheral edge. A first chamber and a third chamber, which are respectively connected to portions of the supply fluid to which the working fluid is supplied and have a pressure difference of the working fluid, and expand or contract according to the pressure difference of the working fluid;
A boundary between the first room and the third room is formed adjacent to the first room and the third room and forms a second room connected to the open end of the supply path. And a piston member having a valve body that opens and closes the opening end of the supply path.
The flow path switching valve according to claim 1, wherein the seal unit includes a seal member having a seal surface that forms a part of a substantially V-shaped cross section at an outer peripheral edge.   3. The flow path switching according to claim 1, wherein the seal unit further includes a biasing member that biases an outer peripheral edge of the seal member against a wall surface that forms the second chamber. valve.   The flow path switching valve according to any one of claims 1 to 3, wherein the seal surface of the seal unit is formed such that an outer peripheral edge portion is continuous with a waveform. In a flow path switching valve having a valve body and connected to a pilot valve that controls switching of the flow path of the valve body,
The valve body is disposed adjacent to at least one of the first chamber and the third chamber and the first chamber and the third chamber to which the working fluid is supplied via the pilot valve. A second chamber in which the open end of the flow path is opened and closed,
A piston member having a seal unit at least at one location corresponding to a boundary portion of each room, and having a valve body that opens and closes the open end, and
The flow path switching valve, wherein the seal unit includes a seal member having a seal surface having a substantially S-shaped cross section or a substantially N-shaped cross section at an outer peripheral edge. The flow path switching valve according to claim 5, wherein the seal unit further includes a biasing member that biases an outer peripheral edge of the seal member against a wall surface forming the second chamber. 7. The flow path switching valve according to claim 3, wherein the seal member and the urging member in the seal unit are supported while being sandwiched between the reinforcing plate and the guide member.

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