JP2017223303A - Flow passage selector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow passage selector valve capable of inhibiting valve leakage at the time of occurrence of back pressure in flow passage formation while suppressing slide resistance in flow passage switching, and capable of preventing plastic deformation of a valve shaft for rotating a valve body.SOLUTION: An upper cam part 22 and a lower cam part 23 are respectively provided at an upper part and lower part of a valve body 20 rotatably disposed in a valve chamber 11. The upper cam part 22 and the lower cam part 23, when the valve body 20 rotates to switch a flow passage, slide with seat members 31, 32 arranged between the valve body 20 and outflow ports (inlet/outlet) p1, p2. Inner peripheral seal surfaces 31A, 32A of the seat members 31, 32 separate from an outer peripheral seal 24 of the valve body 20 against energization force of compression coil springs 37, 38 configured to energize the seal members 31, 32 to the valve body 20 side.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a flow path switching valve, for example, a rotary flow path switching valve that switches a flow path by rotating and sliding a ball-shaped valve body (ball valve body) in a valve chamber.

  As a conventional flow path switching valve of this type, a valve case (valve body) having an inlet and an outlet and having a valve chamber formed therein is rotatably accommodated in the valve chamber. A ball-shaped valve body having a flow path formed therein, and a valve seat (seat member) disposed in association with the inlet and the outlet and pressed against the ball-shaped valve body, According to the rotation of the ball-shaped valve body, the inflow port and the outflow port are switched between a state in which the inflow port and the outflow port are communicated through the flow path of the ball-shaped valve body and a state in which the ball-shaped valve body is pressed against the valve seat and blocked. It is known that the center of the ball-shaped valve element is eccentric with respect to the rotation axis (ball valve).

  In the conventional flow path switching valve (ball valve) as described above, the center of the ball-shaped valve element and the rotation axis of the valve shaft that rotates the ball-shaped valve element (that is, the rotation axis of the ball-shaped valve element) are eccentric. Because of this structure, when switching the flow path, the valve body does not slide against the valve seat while strongly pressing the valve seat, reducing sliding resistance and reducing the torque required for rotation of the valve body. This reduces the load on the motor. Moreover, since it does not always slide on the valve seat surface (seal surface), it is possible to suppress damage and wear of the valve body and the seal surface of the valve seat (for example, see Patent Document 1 below).

Japanese Patent No. 5822586

  By the way, in the conventional flow path switching valve as described above, when the flow path is formed, there is an inlet / outlet portion where the flow path of the valve body is not formed (the part of the valve body that is far from the rotation axis of the valve shaft). The valve seat (seal surface) disposed corresponding to (inlet or outlet) is strongly pressed to close the inlet / outlet, but the valve body is not connected to the inlet / outlet at another inlet / outlet. It will be separated from the corresponding valve seat (seal surface).

  Therefore, when the fluid flows in the reverse direction due to the generation of the reverse pressure, the fluid flows by using the inlet / outlet closed by the valve body as the inlet (that is, the fluid flows from the inlet / outlet side closed by the valve body). In this case, the valve body is pushed by the pressure of the fluid (fluid pressure) (for example, in the reverse direction) and displaced in the valve chamber, a gap is generated between the valve body and the valve seat, and valve leakage occurs. There was concern. In addition, as described above, there is a concern that the valve shaft for rotating the valve body may be plastically deformed when the valve body is pushed and displaced.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to prevent valve leakage at the time of back pressure generation at the time of flow path formation while suppressing sliding resistance at the time of flow path switching. An object of the present invention is to provide a flow path switching valve that can prevent and prevent plastic deformation of a valve shaft that rotates a valve body.

  In order to solve the above-described problem, a flow path switching valve according to the present invention includes a valve body in which a valve chamber is formed and a plurality of inlets / outlets opened in the valve chamber, A valve body that is rotatably arranged in the valve chamber and has a flow path formed therein, and is disposed between the valve body and the inlet / outlet to seal between the valve body and the inlet / outlet. A urging member that urges the seat member toward the valve body to press the seat member against the valve body, and a rotation drive unit that rotates the valve body around a rotation axis. A flow path switching valve configured to selectively switch the communication state of the plurality of inlets / outlets through the flow path of the valve body by rotating the valve body, the valve body including the valve When rotating the body and switching the flow path, sliding on the sheet member, Cam unit for separating the sheet member against the urging force of the energizing member from the valve body is characterized in that is provided.

  In a preferred aspect, the cam portion is provided above and / or below the outer peripheral seal surface that is brought into contact with the inner peripheral seal surface of the seat member when the flow path is formed in the valve body.

  In a further preferred aspect, the cam portion has a polygonal shape when viewed in the rotation axis direction of the valve body.

  In a further preferred aspect, the cam portion is formed with a fitting groove into which a valve shaft that transmits the rotational force of the rotation driving portion to the valve body is fitted.

  In another preferred embodiment, a pair of inlets / outlets are opened on the opposite side to the rotation axis of the valve body in the valve chamber, and the rotation axis of the valve body is corresponding to the pair of inlets / outlets. A pair of sheet members are arranged so as to face each other on the opposite side.

  In another preferred aspect, the biasing member is constituted by a compression coil spring.

  In another preferred aspect, the urging member is housed in an annular mounting groove provided around the inlet / outlet in the valve body.

  According to the present invention, when the valve body is rotated to switch the flow path to the valve body that is rotatably disposed in the valve chamber, the sheet member disposed between the valve body and the inlet / outlet is slid. Since the cam portion that moves and separates the seat member from the valve body against the urging force of the urging member that urges the seat member toward the valve body side is provided, the cam portion Thus, the seat member is not separated from the valve body, and the valve body does not slide with the seat member. Further, when the flow path is formed, the seat member is pressed against the valve body by the urging member (the urging force thereof), and a reliable sealing property is ensured. For this reason, it is possible to prevent valve leakage such as when reverse pressure occurs during flow path formation while suppressing sliding resistance during flow path switching, and to prevent plastic deformation of the valve shaft that rotates the valve element. It becomes.

1 is a partially cutaway perspective view showing an embodiment of a flow path switching valve according to the present invention (a portion having a central angle of 90 ° is cut away in plan view). The perspective view which shows the valve body of FIG. It is a figure which shows the time of flow path formation (valve body rotation angle: 0 degree | times) of the flow path switching valve shown by FIG. 1, (A) is a longitudinal cross-sectional view except a motor, (B) is U of (A). -U1-u2-u3-u4-U sectional drawing which follows a line of sight. It is a figure which shows the time of flow path switching (valve body rotation angle: 45 degree | times) of the flow path switching valve shown by FIG. 1, (A) is a longitudinal cross-sectional view except a motor, (B) is U of (A). -U1-u2-u3-u4-U sectional drawing which follows a line of sight.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In each drawing, gaps formed between members, separation distances between members, etc. may be exaggerated for easy understanding of the invention and for convenience of drawing. is there. Further, in this specification, descriptions representing positions and directions such as up and down, left and right, and front and rear are based on the directional arrow display in FIG. 1 and do not refer to positions and directions in the actual use state.

  FIG. 1 is a partially cutaway perspective view showing an embodiment of a flow path switching valve according to the present invention (a portion having a central angle of 90 degrees in a plan view), and FIG. 2 is a perspective view showing the valve body of FIG. It is.

  The flow path switching valve 1 of the illustrated embodiment is used as, for example, a rotary three-way switching valve that switches the flow path of a fluid flowing in an engine room of an automobile in multiple directions. In order to rotate the valve body 20 around a rotation axis (center line) O, a valve body 10 having a ball-shaped valve body (also called a ball valve body) 20 rotatably disposed in the valve chamber 11, And a motor (rotary drive unit) 50 disposed on the upper portion of the valve body 10. A rotation axis (axis extending in the vertical direction) O of the valve body 20 is coaxial with an inflow port p10 and a center line of the valve shaft 26 described later.

  The valve body 10 is composed of, for example, a side-by-side cylindrical base member 12 and a holder member 15 made of synthetic resin or metal, and the base member 12 has a valve chamber 11 formed therein. A vertical inlet p10 and a horizontal outlet p1 that open to the valve chamber 11 are provided at the bottom and the right, respectively (see also FIGS. 3 and 4). A fitting insertion hole 13 through which a valve shaft 26 connected to the valve body 20 is inserted is provided in the ceiling portion of the base member 12. A short cylindrical holder provided with a lateral outlet p2 opening in the valve chamber 11 (so as to face the outlet p1 formed in the right part of the base member 12) at the left end opening of the base member 12. The member 15 is internally fitted and fixed by ultrasonic welding, press fitting, caulking, or the like.

  That is, the valve body 10 is provided with an inlet p10 that is opened at the bottom of the valve chamber 11, and the outlets p1 and p2 that are opened at the side of the valve chamber 11 are spaced 180 degrees apart. (In other words, opposite to the rotation axis O of the valve body 20).

  The valve body 20 is made of, for example, a synthetic resin, metal, or the like. In order to selectively communicate the inlet p10 and the two outlets p1 and p2 provided in the valve body 10, in other words, the inlet p10 and In order to selectively switch the communication state of the two outlets p1 and p2, a flow path (internal flow path) 21 is provided inside.

  The internal flow passage 21 is a through-hole having a reverse L-shape or a hem-shape and a circular cross-section as viewed from the side, which penetrates the inside of the valve body 20 from the lower portion to the side portion, as can be understood with reference to FIG. The lower opening is always in communication with the inflow port p10, and the side opening is selectively in communication with one of the two outflow ports p1 and p2.

  Further, the upper and lower portions of the valve body 20 (around the lower opening of the internal flow path 21) (more specifically, the inner peripheral seal surfaces 31A and 32A of the annular seat members 31 and 32 are paired with the flow path formation). The upper and lower cam parts 22 and the lower part of the outer peripheral seal surface (curved surface) 24 that are in contact with each other have a substantially identical shape in order to reduce sliding resistance when switching the flow path (detailed later). The cam part 23 is projected (upward and downward).

  Each of the upper cam portion 22 and the lower cam portion 23 has a substantially square shape in plan view (viewed in the direction of the rotation axis O), and has four corner portions chamfered. The outer circumferences (surfaces) of the portion 22 and the lower cam portion 23 are cam surfaces 22C and 23C that slide on the inner circumferences (cam surfaces) of the sheet members 31 and 32 disposed on the outer sides (details will be described later). . An upper cam portion 22 formed in the upper portion of the valve body 20 is provided with a fitting groove 25 having a T-shape in plan view, and a valve shaft connected to the fitting groove 25 to the motor 50 (output shaft thereof). When the front end portion of T 26 (the T-shaped engaging portion formed in a plan view) is fitted, the rotational force of the motor 50 is transmitted to the valve body 20 via the valve shaft 26, and the valve body 20 is rotated. Here, an O-ring 27 as a seal member is interposed in the valve shaft 26 in two stages. Here, the tip of the valve shaft 26 is fitted in the fitting groove 25 with a slight gap in the vertical direction (axis O direction).

  As well understood with reference to FIG. 3 and FIG. 4 together with FIG. 1, around each outlet p1, p2 on the inner wall surface of the valve body 10, it is made of Teflon (registered trademark) or the like, and each outlet p1, Annular sheet members 31, 32 having openings corresponding to p2 are arranged. In other words, in the valve chamber 11 of the valve body 10, a pair of seat members are disposed so as to face the rotation axis O of the valve body 20 on the opposite side corresponding to the pair of left and right outlets p <b> 1 and p <b> 2. 31 and 32 are disposed, and the valve body 20 is disposed between the pair of sheet members 31 and 32 (inside) so as to be freely slidable. In each seat member 31, 32, the portion around the opening in the inner periphery (surface) is configured by a curved surface (a part of a concave spherical surface), and the outer peripheral seal surface (curved surface) 24 of the valve body 20 when the flow path is formed. The inner peripheral sealing surfaces 31A and 32A are brought into contact with each other, and the portion further outside the inner peripheral sealing surfaces 31A and 32A is configured by a substantially flat surface (a vertical surface perpendicular to the horizontal (left and right) direction). The cam surfaces 31C and 32C are in sliding contact with the outer circumferences (cam surfaces 22C and 23C) of the upper cam portion 22 and the lower cam portion 23 of the valve body 20 when the flow path is switched (detailed later). Further, a seal made of an elastic material such as rubber is provided between each seat member 31, 32 and the valve body 10 (specifically, an annular groove formed on the outer periphery of each seat member 31, 32). O-rings 33 and 34 as members are interposed.

  In addition, annular mounting grooves 35 and 36 are provided around the respective outlets p1 and p2 on the inner wall surface of the valve body 10, and the respective seat members 31 and 32 are disposed inside the annular mounting grooves 35 and 36 (that is, Compression coil springs (biasing members) 37 and 38 for energizing the valve body 20 are provided (with the inner end protruding into the valve chamber 11). Due to the urging force (compression force) of the compression coil springs 37 and 38, the inner peripheral seal surfaces 31A and 32A of the sheet members 31 and 32 are brought into close contact with the outer peripheral seal surface 24 of the valve body 20 when the flow path is formed. To prevent leakage (valve leakage) between the valve body 20 and the outlets p1 and p2, and when the flow path is switched, the cam surfaces 31C and 32C of the seat members 31 and 32 are connected to the valve body. 20 (the upper cam portion 22 and the lower cam portion 23) are brought into pressure contact with the cam surfaces 22C and 23C and slid (detailed later).

  In the flow path switching valve 1 having such a configuration, when the valve body 20 is rotated in the valve chamber 11 by the motor 50, the inlet p <b> 10 provided in the valve main body 10 through the internal flow path 21 provided in the valve body 20. And the communication state of the two outlets p1 and p2 is selectively switched.

  Specifically, in the rotational position shown in FIG. 3 (this state is a position where the rotational angle of the valve body 20 is 0 degree), the internal flow path 21 provided in the valve body 20 is connected to the inlet. While communicating with p10, it communicates with the right outlet p1. At this time, the upper cam part 22 and the lower cam part 23 (substantially square) provided at the upper part and the lower part of the valve body 20 are such that the opposing outer peripheral surfaces are perpendicular to the left-right direction (or the opposing outer peripheral surfaces are the left-right direction). In parallel). That is, the width of the upper cam portion 22 and the lower cam portion 23 in the left-right direction (the direction in which the sheet members 31 and 32 are opposed to each other) is set to be the shortest. Therefore, the cam surfaces 31C and 32C of the sheet members 31 and 32 do not contact the cam surfaces 22C and 23C of the valve body 20 (the upper cam portion 22 and the lower cam portion 23 thereof) (the cams of the sheet members 31 and 32). A slight gap is formed between the surfaces 31C, 32C and the cam surfaces 22C, 23C of the valve body 20), and the right and left seat members are urged by the urging forces (compression forces) of the compression coil springs 37, 38. The inner peripheral seal surfaces 31 </ b> A and 32 </ b> A of 31 and 32 are pressed against the outer peripheral seal surface 24 of the valve body 20. Thereby, the opening of the sheet member 32 corresponding to the left outlet p2 is closed by the valve body 20 (the outer peripheral seal surface 24), the flow path leading to the outlet p2 is blocked, and flows upward from the inlet p10. The fluid flows through the internal flow path 21 of the valve body 20 (its flow direction is changed to the right) and flows out only from the right outlet p1.

  In the rotation position rotated 90 degrees counterclockwise from the rotation position shown in FIG. 3 (viewed from above), the internal flow path 21 provided inside the valve body 20 communicates with the inlet p10. It does not communicate with the left and right outlets p1 and p2. Also at this time, the cam surfaces 31C and 32C of the respective seat members 31 and 32 do not contact the cam surfaces 22C and 23C of the valve body 20 (the upper cam portion 22 and the lower cam portion 23 thereof) (the respective seat members 31 and 32). Between the cam surfaces 31C and 32C and the cam surfaces 22C and 23C of the valve body 20), and the urging forces (compression forces) of the compression coil springs 37 and 38 The inner peripheral sealing surfaces 31 </ b> A and 32 </ b> A of the sheet members 31 and 32 are in close contact with and pressed against the outer peripheral sealing surface 24 of the valve body 20. Accordingly, the openings of the left and right sheet members 31 and 32 corresponding to the left and right outlets p1 and p2 are both closed by the valve body 20 (the outer peripheral seal surface 24), and the flow paths are connected to the outlets p1 and p2. Is blocked and the fluid that flows upward from the inlet p10 does not flow out of the outlets p1 and p2.

  Further, in the rotational position rotated 180 degrees counterclockwise from the rotational position shown in FIG. 3, the internal flow path 21 provided in the valve body 20 communicates with the inflow port p10 and the left outflow port. Communicates with p2. Also at this time, the cam surfaces 31C and 32C of the respective seat members 31 and 32 do not contact the cam surfaces 22C and 23C of the valve body 20 (the upper cam portion 22 and the lower cam portion 23 thereof) (the respective seat members 31 and 32). Between the cam surfaces 31C and 32C and the cam surfaces 22C and 23C of the valve body 20), and the urging forces (compression forces) of the compression coil springs 37 and 38 The inner peripheral sealing surfaces 31 </ b> A and 32 </ b> A of the sheet members 31 and 32 are in close contact with and pressed against the outer peripheral sealing surface 24 of the valve body 20. Thereby, the opening of the sheet member 31 corresponding to the right outlet p1 is closed by the valve body 20 (the outer peripheral seal surface 24), the flow path connected to the outlet p1 is blocked, and flows upward from the inlet p10. The fluid passes through the internal flow path 21 of the valve body 20 (its flow direction is changed to the left) and flows out only from the left outlet p2.

  At the time of forming the flow path described above (the rotation angle of the valve body 20 is 0, 90, and 180 degrees), a pair of left and right seat members 31 are applied by the urging force (compression force) of the compression coil springs 37 and 38. The inner peripheral sealing surfaces 31A, 32A of 32 are pressed against the outer peripheral sealing surface 24 of the valve body 20, and the valve body 20 is supported (clamped) by the pair of left and right seat members 31, 32 (the inner peripheral sealing surfaces 31A, 32A thereof). Is done. Therefore, even when the fluid flows in the reverse direction due to the generation of the reverse pressure, the valve body 20 is not displaced in the valve chamber 11 by the pressure of the fluid (fluid pressure).

  On the other hand, if the valve body 20 is rotated by the motor 50 from the time when the flow path is formed (positions where the rotation angle of the valve body 20 is 0 degrees, 90 degrees, and 180 degrees), in other words, the middle of the flow path formation described above. (For example, as shown in FIG. 4, at a rotational position rotated 45 degrees counterclockwise as viewed from above from the rotational position shown in FIG. 3), provided at the upper and lower parts of the valve body 20. The width of the upper cam portion 22 and the lower cam portion 23 (in the direction in which the sheet members 31 and 32 are opposed to each other) of the upper (substantially square shape) and the lower cam portion 23 is increased. Therefore, the cam surfaces 22C and 23C of the upper cam portion 22 and the lower cam portion 23 of the valve body 20 are brought into contact with the cam surfaces 31C and 32C of the respective seat members 31 and 32, and the upper cam portion 22 and the lower cam portion 23 thereof. The cam surfaces 22C and 23C cause the sheet members 31 and 32 to be expanded in the left-right direction (that is, outward) against the urging force of the compression coil springs 37 and 38. 32 inner peripheral sealing surfaces 31 </ b> A and 32 </ b> A are separated from the outer peripheral sealing surface 24 of the valve body 20. Thereby, the outer peripheral sealing surface 24 of the valve body 20 does not slide on the inner peripheral sealing surfaces 31A and 32A of the seat members 31 and 32 at the time of switching the flow path (the upper cam portion 22 and the lower cam portion 23 of the valve body 20). Since only the cam surfaces 22C and 23C slide on the cam surfaces 31C and 32C of the respective seat members 31 and 32), the sliding resistance can be reduced, the torque required for the rotation of the valve body 20 can be suppressed, and the load of the motor 50 Becomes smaller. Even when foreign matter is caught between the valve body 20 and the seat members 31 and 32 when the flow path is formed, the sealing surfaces (the outer peripheral seal surface 24 and the inner peripheral seal) of the valve body 20 and the seat members 31 and 32 are used. The surface 31A, 32A) can be prevented from being scratched or worn, and the foreign matter can be easily discharged to the outside of the valve body 10 through a gap formed between the valve body 20 and the seat members 31, 32. .

  At the time of switching the flow path (when the valve body 20 is rotated), the seat members 31 and 32 are moved to the valve main body 10 (inner wall surface) by the upper cam portion 22 and the lower cam portion 23 of the valve body 20 described above. However, fluid leakage (valve leakage) in the clearance between the seat members 31 and 32 and the valve body 10 is prevented by O-rings 33 and 34 as sealing members interposed therebetween. Is done.

  As described above, in the flow path switching valve 1 of the present embodiment, the upper cam portion 22 and the lower cam portion 23 are provided on the upper and lower portions of the valve body 20 rotatably disposed in the valve chamber 11, and the upper portion thereof. When the cam portion 22 and the lower cam portion 23 rotate the valve body 20 to switch the flow path, the sheet members 31 and 32 disposed between the valve body 20 and the outlets (entrance / exit ports) p1 and p2. The sheet members 31, 32 (inner seal surfaces 31A, 32A thereof) are against the biasing force of the compression coil springs 37, 38 that bias the sheet members 31, 32 toward the valve body 20 side. Since it is separated from the valve body 20 (the outer peripheral seal surface 24), the valve body 20 (the outer peripheral seal surface 24) slides with the sheet members 31, 32 (the inner peripheral seal surfaces 31A, 32A) when the flow path is switched. There is nothing. Further, when the flow path is formed, the sheet members 31, 32 (the inner peripheral seal surfaces 31A, 32A) are pressed against the valve body 20 (the outer peripheral seal surface 24) by the compression coil springs 37, 38 (the urging force thereof) (pressure contact). Secure sealability is ensured. Therefore, while suppressing sliding resistance at the time of switching the flow path, it is possible to prevent valve leakage such as when a reverse pressure is generated at the time of flow path formation, and the plastic deformation of the valve shaft 26 that rotatably supports the valve body 20. It becomes possible to prevent.

  Further, in the flow path switching valve 1 of the present embodiment, the seat members 31 and 32 are urged toward the valve body 20 by the compression coil springs 37 and 38 that are not easily affected by temperature as compared with, for example, an O-ring. For example, the variation in the pressing force of the sheet members 31 and 32 against the valve body 20 can be suppressed as compared with a flow path switching valve that presses the sheet member against the valve body by the elastic force (repulsive force) of the O-ring.

  In the above-described embodiment, a ball-shaped valve body (ball valve body) is adopted as the valve body 20. However, if the flow path is switched according to the rotation of the valve body 20, for example, a cylindrical valve body ( Of course, a cylindrical valve may be used, and the shape and the like of the internal flow path formed therein may be changed according to the intended use.

  In the above embodiment, in consideration of the vertical balance, cam portions (upper cam portion 22 and lower cam portion 23) are provided on both the upper and lower portions of the valve body 20, but only one of the upper and lower portions is provided. Of course, it may be provided. Further, as the upper cam portion 22 and the lower cam portion 23, the distance between the outer peripheral surface (cam surfaces 22C, 23C) (sliding surface with the seat member) and the rotation axis O of the valve body 20 is around the rotation axis O. It is sufficient if it has a profile (outer shape) that changes continuously or in steps, and in addition to a substantially square shape in plan view as in the above embodiment, a polygonal shape or an elliptical shape is adopted. You may do it.

  Moreover, in the said embodiment, although the valve body 20 and the valve shaft 26 are comprised by another component (as a separate body), it cannot be overemphasized that the valve body 20 and the valve shaft 26 may be shape | molded integrally. There is no.

  Moreover, in the said embodiment, as the flow-path switching valve 1, the inflow port p10 is opened at the bottom part of the valve chamber 11, and the two outflow ports p1 and p2 leave | separated 180 degree | times at the side part of the valve chamber 11. Although the three-way selector valve opened as an example has been described above, the arrangement of the inlet and outlet (inlet / outlet) may naturally be changed. For example, the inlet on the bottom side may be omitted. The number and arrangement of the two-way switching valve (see Patent Document 1) that uses one of the side outlets as the inlet, and the number of inlets and outlets (inlet / outlet) opened in the valve chamber have been changed. Needless to say, the switching valve may be four or more. However, also in that case, it is desirable that the seat members arranged corresponding to the respective entrances / exits be arranged at equiangular intervals around the rotation axis O of the valve body 20.

  Furthermore, in the said embodiment, although the urging | biasing member which urges | biases the sheet | seat members 31 and 32 to the valve body 20 side was the compression coil springs 37 and 38, in this invention, it is specifically limited only to this. Alternatively, a coiled wave spring or any other spring means may be used. Further, various elastic materials such as metal and resin can be used as the material.

DESCRIPTION OF SYMBOLS 1 Flow path switching valve 10 Valve body 11 Valve chamber 12 Base member 13 Insertion hole 15 Holder member 20 Valve body 21 Internal flow path 22 Upper cam part 23 Lower cam part 22C Cam surface (outer peripheral surface) of the upper cam part
23C Cam surface (outer peripheral surface) of lower cam
24 outer peripheral seal surface 25 fitting groove 26 valve shaft 27 O-rings 31, 32 seat members 31A, 32A inner peripheral seal surfaces 31C, 32C seat member cam surfaces 33, 34 O-rings 35, 36 annular mounting grooves 37, 38 compression coil Spring (biasing member)
50 motor (rotary drive)
p1 outlet (entrance / exit)
p2 outlet (entrance / exit)
p10 Inlet (entrance / exit)

Claims (7)

A valve body in which a valve chamber is formed, a valve body provided with a plurality of inlets / outlets opened in the valve chamber, and a valve that is rotatably disposed in the valve chamber and has a flow path formed therein A sheet member disposed between the valve body and the inlet / outlet, and the sheet member to press the sheet member against the valve body. An urging member that urges the member toward the valve body; and a rotation drive unit that rotates the valve body around a rotation axis, and the communication state of the plurality of inlets and outlets is achieved by rotating the valve body. A flow path switching valve configured to selectively switch through the flow path of the valve body,
A cam that slides on the seat member and separates the seat member from the valve body against the urging force of the urging member when the valve body is rotated on the valve body to switch the flow path. A flow path switching valve provided with a portion.   The cam portion is provided on an upper side and / or a lower side of an outer peripheral seal surface that is brought into contact with an inner peripheral seal surface of the seat member when the flow path is formed in the valve body. 1. The flow path switching valve according to 1.   The flow path switching valve according to claim 2, wherein the cam portion has a polygonal shape when viewed in the rotation axis direction of the valve body.   4. The flow path according to claim 2, wherein a fitting groove into which a valve shaft that transmits a rotational force of the rotation driving unit to the valve body is fitted is formed in the cam portion. 5. Switching valve.   A pair of inlets / outlets are opened on the opposite side to the rotation axis of the valve body in the valve chamber, and are arranged opposite to the rotation axis of the valve body corresponding to the pair of inlets / outlets. The flow path switching valve according to any one of claims 1 to 4, wherein a pair of sheet members are arranged.   The flow path switching valve according to any one of claims 1 to 5, wherein the urging member includes a compression coil spring.   The flow path switching valve according to any one of claims 1 to 6, wherein the urging member is housed in an annular mounting groove provided around the inlet / outlet of the valve body.

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