Flow path switching device

Abstract

To prevent at least one of seal members from being partially warped from each valve element by fluid pressure acting on each valve element when opening a valve, in a flow passage switching device in which each valve element is seated on each corresponding valve seat via the seal member when closing the valve.SOLUTION: The flow path switching device 1 switches the flow of the fluid introduced into the introduction flow path 21 between the first lead-out flow path 221 and the second lead-out flow path 222 by moving the first valve body 131 and the second valve body 132 in the axial direction by the valve shaft 14 to switch between opening and closing of the first valve body 131 and the first valve seat 121 and between opening and closing of the second valve body 132 and the second valve seat 122. In at least one of the first seal member 18 and the second seal member 19, a communication path 51,52 capable of communicating with the introduction flow path 21 when the first valve body 131 or the second valve body 132 is opened is provided at a boundary portion with at least one of the corresponding first valve body 131 and second valve body 132.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a flow path switching device that switches a flow path of a fluid. [Background technology]

[0002] A conventional example of this type of technology is a valve device (flow path switching device) having a three-way poppet valve structure, as described in Patent Document 1 below. This device includes a first valve element and a second valve element that abut against or are spaced apart from a first valve seat and a second valve seat provided in a flow path of a housing. The first valve element and the second valve element are attached at a distance from each other on a valve stem. The flow path includes an inlet (inlet flow path) through which the fluid flows, and a first outlet (first outlet flow path) and a second outlet (second outlet flow path) through which the fluid flows. The first valve seat is provided at the boundary between the inlet flow path and the first outlet flow path, and the second valve seat is provided at the boundary between the inlet flow path and the second outlet flow path. The valve stem is reciprocated in the axial direction by a motor, thereby causing the first valve element to abut against or be spaced apart from the first valve seat, and simultaneously causing the second valve element to abut against or be spaced apart from the second valve seat. This allows the inlet flow path to communicate with the first outlet flow path or to be blocked, and simultaneously allows the inlet flow path to communicate with the second outlet flow path or to be blocked, thereby switching the flow path of the fluid flowing into the inlet flow path between the first outlet flow path and the second outlet flow path.

[0003] Here, it is conceivable to provide a seal member made of an elastic material between each valve element and the corresponding valve seat to ensure fluid sealing when the valve is closed. In the above-described device, as an example, a seal member is attached to the second valve seat. When the second valve element is closed, the second valve element is seated on the second valve seat via the seal member.

[0004] 5, it is also conceivable to attach a seal member 74 to each of a first valve body 72 and a second valve body 73 provided on a valve shaft 71 (the seal member 74 may be attached to at least one of the first valve body 72 and the second valve body 73), and to configure the valve bodies 72, 73 to seat on the corresponding valve seats 75, 76 via the seal member 74 (conceivable technology). Here, when the valve bodies 72, 73 seat on the corresponding valve seats 75, 76 via the seal member 74, the seal member 74 is sandwiched and compressed between the valve bodies 72, 73 and the corresponding valve seats 75, 76. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-30893 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-described assumed technology, a seal member 74 is attached to the upper or lower surface of each valve disc 72, 73. When the valve is closed, the valve discs 72, 73 seat on the corresponding valve seats 75, 76 via the seal member 74. At this time, a pressure difference occurs between the upstream and downstream sides of each valve seat 75, 76. This pressure difference causes the seal member 74 to adhere to each valve seat 75, 76. Therefore, when the valve is opened, the valve discs 72, 73 are unlikely to separate from the corresponding valve seats 75, 76, which may impair the valve opening response of each valve disc 72, 73. Furthermore, when the valve is opened, for example, fluid pressure acting on the first valve disc 72 may cause the seal member 74 to partially peel off from the first valve disc 72, resulting in "turning up," or peeling away, as shown in FIG. 5. This "turning" may cause foreign matter to become caught between the valve bodies 72, 73 and the seal member 74, may cause pressure loss in the flow path, or may impair the sealing properties of the seal member 74 when the valve is closed.

[0007] This disclosed technology has been made in consideration of the above circumstances, and its purpose is to prevent at least one of the sealing members from being partially distorted and curled away from each valve body due to the fluid pressure acting on each valve body when the valve is open in a flow path switching device in which each valve body sits on a corresponding valve seat via a sealing member when the valve is closed. [Means for solving the problem]

[0008] In order to achieve the above object, the technology described in claim 1 includes a flow path member, an inlet flow path formed in the flow path member for introducing a fluid, a first outlet flow path formed in the flow path member for discharging the fluid introduced from the inlet flow path, a second outlet flow path formed in the flow path member for discharging the fluid introduced from the inlet flow path, a first valve seat provided in the flow path member between the inlet flow path and the first outlet flow path, a second valve seat provided in the flow path member between the inlet flow path and the second outlet flow path, a first valve body abutting and separating from the first valve seat, a second valve body abutting and separating from the second valve seat, a valve stem to which the first valve body and the second valve body are attached, and a valve shaft held by the first valve body on the valve stem and abutting against the first valve seat. and a second sealing member that is held by two valve bodies on a valve stem and is capable of abutting against a second valve seat, and the first and second valve bodies are moved in the axial direction by the valve stem to switch between opening and closing the first valve body and the first valve seat and closing and opening the second valve body and the second valve seat, thereby switching the flow of a fluid introduced into an introduction flow path between a first outlet flow path and a second outlet flow path, wherein at least one of the first and second sealing members is provided with a communication path at the boundary with the corresponding at least one of the first and second valve bodies, which is capable of communicating with the introduction flow path when the first or second valve body is open.

[0009] According to the configuration of the above technology, when the flow path switching device is closed, the first valve element or the second valve element is seated on the corresponding first valve seat or the corresponding second valve seat via the corresponding first seal member or the second seal member. At this time, a pressure difference occurs between the upstream side and the downstream side of the valve seat on which the valve element is seated, and the pressure difference causes the seal member to adhere to the valve seat. On the other hand, when the flow path switching device is opened, the valve element seated on the valve seat is separated from the valve seat. Here, a communication path that can communicate with the introduction flow path is provided at the boundary between the valve element and the seal member held by the valve element. Therefore, when the valve element is separated from the valve seat, fluid pressure acts on the valve element, but fluid also flows through the communication path, making it easier for the entire seal member to separate from the valve seat.

[0010] In order to achieve the above object, the technology described in claim 2 is the technology described in claim 1, wherein the communication path includes a gap formed on the opposing surface between at least one of the first seal member and the second seal member and at least one of the corresponding first valve body and second valve body, and a plurality of through holes penetrating in the axial direction between the center of at least one of the first seal member and the second seal member and the center of the corresponding at least one of the first valve body and second valve body.

[0011] According to the configuration of the above technology, the communication flow path is composed of a gap formed on the opposing surfaces of the seal member and the valve body, and a plurality of through-holes between the center of the seal member and the center of the valve body. Therefore, in addition to the effect of the technology described in claim 1, the fluid flowing in the gap on the opposing surfaces of the seal member and the valve body is dispersed and flows through the plurality of through-holes.

[0012] In order to achieve the above object, the technology described in claim 3 is the technology described in claim 2, in which a shaft support hole penetrating in the axial direction is formed in the center of at least one of the first seal member and the second seal member to support the center of at least one of the corresponding first valve body and second valve body, and the through hole is arranged on the outer periphery of the shaft support hole.

[0013] According to the configuration of the above technology, in addition to the effect of the technology described in claim 2, the seal member is pivotally supported at the center of the valve body by the pivotal support hole. Also, the through hole through which the fluid flows is arranged separately from the pivotal support hole on the outer periphery of the pivotal support hole. [Effects of the Invention]

[0014] According to the technology described in claim 1, in a flow path switching device in which each valve element is seated on a corresponding valve seat via a sealing member when the valve is closed, it is possible to prevent at least one of the sealing members from being partially distorted and turned up from each valve element due to the fluid pressure acting on each valve element when the valve is open.

[0015] According to the technology recited in claim 2, in addition to the effect of the technology recited in claim 1, it is possible to eliminate unevenness in the action of fluid pressure on each seal member.

[0016] According to the technology recited in claim 3, in addition to the effect of the technology recited in claim 2, it is possible to ensure the holding force of the seal member against the valve body and also to ensure the flow path area of ​​the through hole. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a cross-sectional view showing a flow path switching device according to an embodiment. [Figure 2] FIG. 2 is an enlarged cross-sectional view showing the valve body and valve seat of FIG. 1 according to one embodiment. [Figure 3] 3 is a cross-sectional view showing only the valve body portion of FIG. 2 according to one embodiment. [Figure 4] 4A and 4B are cross-sectional views taken along line XX and line YY in FIG. 3, showing the first seal member (second seal member) according to one embodiment. [Figure 5] FIG. 10 is an enlarged cross-sectional view showing a valve body and a valve seat of a flow path switching device according to a conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a detailed description will be given of one embodiment of the "flow path switching device" of this disclosed technique with reference to the drawings.

[0019] [Configuration of flow path switching device] A cross-sectional view of a flow path switching device 1 according to this embodiment is shown in Fig. 1. As shown in Fig. 1, the flow path switching device 1 includes a flow path housing 11 having a plurality of flow paths, a valve seat 12, a valve element 13, a valve stem 14, and an actuator 15.

[0020] This flow path switching device 1 has a three-way poppet valve structure. The flow path housing 11 includes a valve chamber 20 that houses a valve element 13, one inlet flow path 21, and two outlet flow paths 22. The valve chamber 20 forms one end of the inlet flow path 21. In this embodiment, the flow path housing 11 is made of resin. The flow path housing 11 corresponds to an example of a "flow path member" in the disclosed technology.

[0021] The inlet flow path 21 is a flow path through which fluid flows into the valve chamber 20. The outlet flow path 22 is a flow path through which fluid flows out of the valve chamber 20. The two outlet flow paths 22 include a first outlet flow path 221 and a second outlet flow path 222. The first outlet flow path 221 is provided on the actuator 15 side of the valve chamber 20. The second outlet flow path 222 is provided on the opposite side of the valve chamber 20 from the actuator 15.

[0022] The valve seat 12 includes a first valve seat 121 and a second valve seat 122. The first valve seat 121 is provided between the valve chamber 20 and the first outlet flow path 221. The second valve seat 122 is provided between the valve chamber 20 and the second outlet flow path 222. The first valve seat 121 and the second valve seat 122 are both formed in an annular shape and have a first valve hole 16 and a second valve hole 17 in their centers, respectively. The valve seat 12 is formed from resin, but can also be formed from rubber.

[0023] The valve element 13 is attached to the lower end of the valve stem 14. The valve element 13 opens and closes the first valve hole 16 and the second valve hole 17 by coming into contact with and separating from the valve seat 12. In this embodiment, the valve element 13 includes a first valve element 131 and a second valve element 132 arranged at a distance 26 in the axial direction of the valve stem 14. The first valve element 131 comes into contact with and separates from the first valve seat 121. A first seal member 18 is provided at the contact portion of the first valve element 131 with the first valve seat 121. The first seal member 18 is held by the first valve element 131 on the valve stem 14 and can come into contact with the first valve seat 121. The second valve element 132 comes into contact with and separates from the second valve seat 122. A second seal member 19 is provided at the contact portion of the second valve element 132 with the second valve seat 122. The second seal member 19 is held by the second valve body 132 on the valve stem 14 and can abut against the second valve seat 122. In this embodiment, the valve body 13 is formed by integrally molding the first valve body 131 and the second valve body 132 from resin. The valve body 13 can also be formed from metal. The seal members 18, 19 are formed from rubber in the shape of annular plates of the same dimensions, but can also be formed from other elastic materials.

[0024] The valve stem 14 is disposed inside the flow path housing 11 and the actuator 15. One end of the valve stem 14 is disposed in the actuator 15. The other end of the valve stem 14 is disposed in the valve chamber 20, and the valve element 13 is attached to it. The valve stem 14 is capable of reciprocating in the thrust direction, which is its axial direction. In this embodiment, the valve stem 14 is made of metal, but it can also be made of resin.

[0025] The actuator 15 is a member that moves the valve shaft 14 in the axial direction together with the valve element 13. In this embodiment, the actuator 15 includes a movable core 31, a fixed core 32, a bobbin 33, a coil 34, a casing 35, etc., and is configured as a "solenoid."

[0026] The movable core 31 is provided integrally with the valve stem 14 and moves in the axial direction, thereby moving the valve stem 14 in the axial direction. The fixed core 32 is disposed opposite the movable core 31 in the axial direction of the valve stem 14. A thrust bearing 36 for the valve stem 14 is provided between the upper end of the valve stem 14 and the fixed core 32. In addition, a compression spring 37 is provided on the outer periphery of the valve stem 14, between the thrust bearing 36 and the movable core 31, for urging the movable core 31 downward in Figure 1.

[0027] The movable core 31 and the fixed core 32 are made of a magnetic material (e.g., metal). When a current flows through the coil 34 and a magnetic field is generated around the coil 34, the movable core 31 and the fixed core 32 are magnetized by the magnetic field. When the movable core 31 and the fixed core 32 are magnetized, the movable core 31 is attracted to the fixed core 32 by magnetic force. This attraction causes the movable core 31, together with the valve stem 14, to approach the fixed core 32 against the biasing force of the compression spring 37. When no current flows through the coil 34, the movable core 31 and the fixed core 32 are not magnetized, and the movable core 31 is not attracted to the fixed core 32. In this case, the movable core 31, together with the valve stem 14, is moved away from the fixed core 32 by the biasing force of the compression spring 37.

[0028] The bobbin 33 is formed in a cylindrical shape. The bobbin 33 has a movable core 31 and a fixed core 32 provided inside, and a coil 34 provided on the outside. The bobbin 33, the coil 34, etc. are molded with resin to form a resin casing 35. A connector 35a protruding laterally is formed integrally with the casing 35. A terminal 34a extending from the coil 34 is provided on the connector 35a.

[0029] The flow path switching device 1 configured as described above can be switched between a first open valve state shown in Fig. 1 and a second open valve state (not shown) by moving the valve shaft 14 in its axial direction using the actuator 15. That is, the flow path switching device 1 moves the first valve element 131 and the second valve element 132 in the axial direction using the valve shaft 14 to switch between opening and closing the first valve element 131 and the first valve seat 121 and between opening and closing the second valve element 132 and the second valve seat 122. By this switching, the flow of the fluid introduced into the introduction flow path 21 is switched between the first outlet flow path 221 and the second outlet flow path 222.

[0030] 1, the "first open valve state" is a state in which the first valve seat 121 and the first valve element 131 are fully open, and the second valve seat 122 and the second valve element 132 are fully closed. The "second open valve state" is a state in which the first valve seat 121 and the first valve element 131 are fully closed, and the second valve seat 122 and the second valve element 132 are fully open. The "fully closed state" is a state in which the valve seat 12 and the valve element 13 abut against each other over the entire circumference of one end of the annular valve seat 12 via the seal members 18 and 19, thereby sealing the gap between the valve seat 12 and the valve element 13.

[0031] 1, the fluid introduced from the inlet flow path 21 is discharged from the first outlet flow path 221. In the second open state, the fluid introduced from the inlet flow path 21 is discharged from the second outlet flow path 222.

[0032] In this embodiment, the first valve seat 121 and the bobbin 33 are integrally configured. The first valve seat 121 is formed integrally with the bobbin 33, which is separate from the flow path housing 11. The bobbin 33 has a connecting portion 40 at the connection between the inlet flow path 21 and the first outlet flow path 221. The connecting portion 40 is held coaxially with the valve stem 14. In other words, the first valve seat 121 and the bobbin 33 are formed integrally via the connecting portion 40. The first valve seat 121 and the connecting portion 40 are housed inside the flow path housing 11 (part of the first outlet flow path 221). In this embodiment, the connecting portion 40 includes a plurality of pillar portions 41. An opening 42 through which the fluid flows is formed between adjacent pillar portions 41.

[0033] [Valve seat shape] The shape of the valve seat 12 in this embodiment will be described. As shown in Fig. 2, the valve body side opening edge of the first valve hole 16 is formed into a flat surface that can come into contact with the first seal member 18. Furthermore, the valve body side opening edge of the second valve hole 17 is formed into a flat surface that can come into contact with the second seal member 19. Each of the valve seats 121, 122 is inherently more rigid than each of the seal members 18, 19.

[0034] [Relationship between the valve body and the sealing material] The valve body 13 and seal members 18, 19 of this embodiment will be described. FIG. 2 shows an enlarged cross-sectional view of the valve body 13 and valve seat 12 of FIG. 1 according to this embodiment. FIG. 3 shows a cross-sectional view of only the valve body 13 of FIG. 2. As shown in FIGS. 1 to 3, each valve body 131, 132 has opposing walls 131a, 132a that converge toward the valve holes 16, 17 of the corresponding valve seats 121, 122. The first seal member 18 is provided so as to be able to abut against the first valve seat 121 at a seating portion of the first valve body 131 where it contacts the first valve seat 121. The second seal member 19 is provided so as to be able to abut against the second valve seat 122 at a seating portion of the second valve body 132 where it contacts the second valve seat 122. Each seal member 18, 19 is inherently elastic.

[0035] Fig. 4 shows the first seal member 18 (second seal member 19) in a cross-sectional view taken along line XX and line YY in Fig. 3. As shown in Fig. 2 and Fig. 3, in this embodiment, both the first seal member 18 and the second seal member 19 are provided with communication paths 51, 52 at the boundary between the corresponding first valve body 131 and second valve body 132, which are capable of communicating with the valve chamber 20 (inlet flow path 21) when the first valve body 131 or the second valve body 132 is open.

[0036] As shown in FIGS. 2 and 3 , the first seal member 18 is provided at the boundary with the first valve body 131 with a first communication path 51 that can communicate with the valve chamber 20 (inlet flow path 21) when the first valve body 131 is open. The first communication path 51 includes a first gap 61 formed between the lower surface of the first seal member 18 and the upper surface of the first valve body 131, and a plurality of first through-holes 64 that penetrate in the axial direction between the center of the first seal member 18 and the center of the first valve body 131, as shown in FIG. 4 . The first seal member 18 has ridges 18a and 18b that protrude upward and downward from its outer periphery. The first seal member 18 contacts the upper surface of the first valve body 131 via the lower ridge 18b. This forms the first gap 61 between the first seal member 18 and the first valve body 131. When the first valve body 131 is seated on the first valve seat 121, the first seal member 18 comes into contact with the first valve seat 121 via the upper ridge 18a, and the ridge 18a is compressed, causing the upper surface of the first seal member 18 to tightly contact the first valve seat 121. Meanwhile, as shown in FIG. 4, a first shaft support hole 67 is formed in the center of the first seal member 18, penetrating in the axial direction to support the first valve body 131 at the center. A plurality of first through holes 64 are arranged at equal angular intervals around the outer periphery of the first shaft support hole 67. The first through holes 64 and the first shaft support hole 67 are connected to each other.

[0037] Similarly, as shown in FIGS. 2 and 3 , the second seal member 19 is provided at the boundary with the second valve body 132 with a second communication path 52 that can communicate with the valve chamber 20 (inlet flow path 21) when the second valve body 132 is open. The second communication path 52 includes a second gap 62 formed between the upper surface of the second seal member 19 and the lower surface of the second valve body 132, and, as shown in FIG. 4 , a plurality of second through-holes 65 that penetrate the second seal member 19 in the axial direction between the center of the second seal member 19 and the center of the second valve body 132. The second seal member 19 has ridges 19 a and 19 b that protrude upward and downward on its outer periphery. The second seal member 19 contacts the lower surface of the second valve body 132 via the upper ridge 19 a. This forms the second gap 62 between the second seal member 19 and the second valve body 132. When the second valve body 132 is seated on the second valve seat 122, the second seal member 19 comes into contact with the second valve seat 122 via the lower ridge 19b, and the ridge 19b is compressed, causing the lower surface of the second seal member 19 to tightly contact the second valve seat 122. As shown in FIG. 4, a second bearing hole 68 is formed in the center of the second seal member 19, penetrating in the axial direction to support the second seal member 19 at the center of the second valve body 132. A plurality of second through holes 65 are arranged at equal angular intervals around the outer periphery of the second bearing hole 68. The second through holes 65 and the second bearing holes 68 are connected to each other.

[0038] [About the function and effect of the flow path switching device] According to the configuration of the flow path switching device 1 of this embodiment described above, the first valve element 131 or the second valve element 132 is seated on the corresponding first valve seat 121 or second valve seat 122 via the first seal member 18 or the second seal member 19. At this time, a pressure difference occurs between the upstream side and downstream side of the valve seats 121, 122 on which the valve elements 131, 132 are seated, and the pressure difference causes the seal members 18, 19 to tightly contact the valve seats 121, 122. On the other hand, when the flow path switching device 1 is opened, the valve elements 131, 132 seated on the valve seats 121, 122 move away from the valve seats 121, 122. Here, a first communication path 51 or a second communication path 52 that can communicate with the valve chamber 20 (inlet flow path 21) is provided at the boundary between the seal members 18, 19 held by the valve elements 131, 132 and the valve elements 131, 132. Therefore, when the valve elements 131, 132 move away from the valve seats 121, 122, fluid pressure acts on the valve elements 131, 132, and fluid also flows through the first communication path 51 or the second communication path 52. This makes it easier for the entire first seal member 18 or the second seal member 19 to move away from the first valve seat 121 or the second valve seat 122. Therefore, in the flow path switching device 1 in which the valve elements 131, 132 are seated on the corresponding valve seats 121, 122 via the seal members 18, 19 when the valves are closed, it is possible to prevent the seal members 18, 19 from being partially distorted and turned up from the valve elements 131, 132 due to fluid pressure acting on the valve elements 131, 132 when the valves are open. As a result, it is possible to prevent foreign matter from getting caught between each valve body 131, 132 and the sealing members 18, 19, prevent pressure loss in the flow path due to curling of each sealing member 18, 19, and prevent the sealing properties of the sealing members 18, 19 from being impaired when the valve is closed.

[0039] According to the configuration of this embodiment, each communication flow path 51, 52 is composed of gaps 61, 62 formed in the opposing surfaces of the seal members 18, 19 and the valve discs 131, 132, and a plurality of through holes 64, 65 between the center of each seal member 18, 19 and the center of each valve disc 131, 132. Therefore, the fluid flowing through the gaps 61, 62 in the opposing surfaces of the seal members 18, 19 and the valve discs 131, 132 is dispersed and flows through the plurality of through holes 64, 65. This eliminates uneven application of fluid pressure to the seal members 18, 19. In this sense, the position of each seal member 18, 19 relative to the valve discs 131, 132 can be stabilized, and the holding force of each seal member 18, 19 relative to the valve discs 131, 132 can be ensured.

[0040] According to the configuration of this embodiment, the seal members 18, 19 are pivotally supported at the center of the valve bodies 131, 132 by the pivot holes 67, 68. Furthermore, the through holes 64, 65 through which the fluid flows are disposed separately from the pivot holes 67, 68 on the outer peripheries of the pivot holes 67, 68. Therefore, it is possible to ensure the holding force of the seal members 18, 19 on the valve bodies 131, 132, and also to ensure the flow path area of ​​the through holes 64, 65.

[0041] <Another embodiment> The disclosed technology is not limited to the above-described embodiment, and part of the configuration can be appropriately modified within the scope of the disclosed technology.

[0042] (1) In the above embodiment, the communication paths 51, 52 that can communicate with the valve chamber 20 (inlet flow path 21) when the first valve body 131 or the second valve body 132 is open are provided at the boundary between the first seal member 18 and the second seal member 19 and the corresponding first valve body 131 or second valve body 132. However, it is also possible to provide a communication path that can communicate with the valve chamber (inlet flow path) when the first valve body or the second valve body is open at the boundary between the first seal member or the second seal member and the corresponding first valve body or second valve body.

[0043] (2) In the above embodiment, the seal members 18, 19 are configured to be pivotally supported by the corresponding valve bodies 131, 132 provided on the valve shaft 14. However, each seal member may be configured to be pivotally supported by the valve shaft that supports the corresponding valve body. [Industrial Applicability]

[0044] The disclosed technology can be used in a fluid circuit through which a fluid flows. [Explanation of symbols]

[0045] 1 Flow path switching device 11 Flow path housing (flow path member) 121 First valve seat 122 Second valve seat 131 First valve body 132 Second valve body 14 Valve stem 18 First seal member 19 Second seal member 20 Valve chamber (inlet flow path) 21 Inlet channel 221 First outlet channel 222 Second outlet channel 51 First connecting route 52 Second connecting route 61 First Gap 62 Second Gap 64 First through hole 65 Second through hole 67 First shaft support hole 68 Second shaft support hole

Claims

1. A flow path member; an introduction flow path formed in the flow path member for introducing a fluid; a first outlet flow path formed in the flow path member for discharging the fluid introduced from the inlet flow path; a second outlet flow path formed in the flow path member for discharging the fluid introduced from the inlet flow path; a first valve seat provided in the flow path member between the inlet flow path and the first outlet flow path; a second valve seat provided in the flow path member between the inlet flow path and the second outlet flow path; a first valve body that comes into contact with and moves away from the first valve seat; a second valve body that comes into contact with and moves away from the second valve seat; a valve stem to which the first valve body and the second valve body are attached; a first seal member that is held by the first valve body on the valve stem and that is capable of contacting the first valve seat; a second seal member that is held by the second valve body on the valve shaft and is capable of abutting against the second valve seat; a valve shaft configured to move the first valve body and the second valve body in an axial direction to switch between opening and closing a relationship between the first valve body and the first valve seat and between opening and closing a relationship between the second valve body and the second valve seat, thereby switching a flow of a fluid introduced into the introduction flow path between the first outlet flow path and the second outlet flow path, At least one of the first seal member and the second seal member is provided with a communication path at a boundary with the corresponding at least one of the first valve body and the second valve body, the communication path being able to communicate with the introduction flow path when the first valve body or the second valve body is open. A flow path switching device characterized by:

2. The flow path switching device according to claim 1, The communication path includes a gap formed between an opposing surface of at least one of the first seal member and the second seal member and a corresponding opposing surface of at least one of the first valve body and the second valve body, and a plurality of through holes penetrating in the axial direction between a center of at least one of the first seal member and the second seal member and a center of the corresponding at least one of the first valve body and the second valve body. A flow path switching device characterized by:

3. The flow path switching device according to claim 2, a support hole is formed in a center of at least one of the first seal member and the second seal member, the support hole passing through in the axial direction to support the center of at least one of the corresponding first valve body and the second valve body; The through hole is disposed on the outer periphery of the shaft support hole. A flow path switching device characterized by:

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