Valve device

Abstract

To provide a valve device that is suppressed in warpage of a valve seat which is caused by stress action even when the valve seat is caught between a first housing and a second housing and can reduce deviation in the seal line of the valve seat.SOLUTION: In the present invention, the housing of a valve device comprises a first housing 111 and a second housing 112. A valve element of the valve device includes a first valve seat 121 formed from an elastic body, and an outer peripheral part of the first valve seat 121 is caught and fixed between the first housing 111 and the second housing 112. A relief gap 28 is provided between a portion of the opposing surfaces of the first housing 111 and the first valve seat 121 to release deformation of the first valve seat 121 due to being caught between the first housing 111 and the second housing 112.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a valve device for controlling the flow of a fluid. [Background technology]

[0002] A conventional example of this type of technology is the valve device described in Patent Document 1 below. This valve device has a poppet valve structure in which the valve element moves perpendicularly to the seat portion of the valve seat. This valve device is configured as a three-way valve and includes a flow path that branches into two in a housing, two valve seats corresponding to the branching portions of each flow path, and two valve elements corresponding to each valve seat. The two valve elements are arranged at an interval on a single valve shaft and are configured to be able to reciprocate axially together with the valve shaft.

[0003] In this valve device, the housing is composed of a first housing and a second housing. Two valve seats are fixed by being press-fitted into recesses at the inlets of the flow paths in each housing. Here, in order to simplify the valve seat fixing process, it is conceivable to adopt a method in which the valve seats are fixed by sandwiching them between the first housing and the second housing when the two housings are assembled. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-30893 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when sandwiching a valve seat between two housings as described above, the following problem may arise. Figures 8 and 9 are partial cross-sectional views showing various steps in sandwiching and fixing the valve seat 103 between the first housing 101 and the second housing 102. Figure 8 shows the state before the valve seat 103 is sandwiched. Figure 9 shows the state after the valve seat 103 has been sandwiched. In this case, the valve seat 103 is made of rubber and has a circular disk shape with a central valve hole 103a. A circular seal portion 103b that can come into contact with the valve disc 104 is protruded from the lower sealing surface of the valve seat 103. A circular seal portion 103c that can abut against the valve disc 104 is protruded from the upper outer periphery of the valve seat 103 to seal between the two housings 101, 102.

[0006] 9, when the valve seat 103 is sandwiched between the housings 101 and 102, the compressed upper seal portion 103c is crushed, and the resulting stress acts toward the center of the valve seat 103 as shown by the arrows. As a result, the valve seat 103 warps downward due to the stress, and the seal line of the lower seal portion 103b (the apex line of the seal portion 103b) shifts. As a result, there is a concern that poor sealing may occur between the valve disc 104 and the valve seat 103.

[0007] This disclosed technology has been made in consideration of the above circumstances, and its purpose is to provide a valve device that can suppress warping of the valve seat due to the action of stress, even when the valve seat is sandwiched between a first housing and a second housing, and reduce deviation of the seal line of the valve seat. [Means for solving the problem]

[0008] In order to achieve the above object, the technology described in claim 1 is a valve device comprising a housing including a flow path, a valve portion for opening and closing the flow path of the housing, and a drive portion fixed to the housing for driving the valve portion, wherein the valve portion is provided in the flow path of the housing and comprises a valve seat having a valve hole, a valve element that opens and closes the valve hole by seating on and separating from the valve seat, and a valve stem connected to the valve element for moving the valve element in the axial direction relative to the valve seat, wherein the housing is composed of a first housing and a second housing, the valve seat is composed of an elastic body, the outer periphery of the valve seat is sandwiched and fixed between the first housing and the second housing, and a relief gap is provided in part of the opposing surface between the first housing and the valve seat to release stress acting on the valve seat due to sandwiching between the first housing and the second housing.

[0009] According to the configuration of the above technology, the valve seat is made of an elastic body, and its outer periphery is sandwiched and fixed between the first housing and the second housing. Furthermore, a relief gap is provided in a portion of the opposing surface between the first housing and the valve seat to release stress acting on the valve seat due to sandwiching between the first housing and the second housing. Therefore, even if the valve seat is crushed between the first housing and the second housing and stress acts on the valve seat, deformation due to the stress is released through the relief gap.

[0010] In order to achieve the above object, the technology described in claim 2 is the technology described in claim 1, wherein the first housing is provided with a first flow path that constitutes a flow path, the second housing is provided with a second flow path that constitutes a flow path, a valve seat is arranged at the connection between the first flow path and the second flow path, the maximum inner diameter of the first flow path at the connection part is larger than the inner diameter of the second flow path at the connection part, the valve seat includes a step part having an outer diameter smaller than the maximum inner diameter of the first flow path, and an escape gap is formed between the inner circumferential wall of the first flow path having the maximum inner diameter and the outer circumferential wall of the step part of the valve seat.

[0011] According to the configuration of the above technology, the relief groove is defined between the inner circumferential wall of the first flow path having the maximum inner diameter and the outer circumferential wall of the step portion of the valve seat, and an effect equivalent to that of the technology described in claim 1 can be obtained.

[0012] In order to achieve the above object, the technology described in claim 3 is the technology described in claim 2, wherein the valve seat is provided with a sleeve portion that can be fitted into the inner circumferential wall of the second flow path. The purpose is as follows.

[0013] According to the configuration of the above technique, in addition to the effect of the technique described in claim 2, the sleeve portion of the valve seat fits into the inner circumferential wall of the second flow path, thereby further suppressing warping of the valve seat. [Effects of the Invention]

[0014] According to the technology described in claim 1, even if the valve seat is sandwiched between the first housing and the second housing, warping of the valve seat due to the action of stress can be suppressed, and deviation of the seal line of the valve seat can be reduced.

[0015] According to the technology recited in claim 2, the relief groove is defined between the inner periphery of the first flow path and the outer periphery of the valve seat, and the same effect as that of the technology recited in claim 1 can be obtained.

[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 further reduce the deviation of the seal line of the valve seat. [Brief explanation of the drawings]

[0017] [Figure 1] 3 is a cross-sectional view showing the valve device in a first open state in one embodiment. FIG. [Figure 2] FIG. 4 is a cross-sectional view showing the valve device in a second open state in one embodiment. [Figure 3] 2 is an enlarged cross-sectional view showing a connection portion between a first outlet channel and an inlet channel (valve chamber) in FIG. 1 according to one embodiment. [Figure 4] FIG. 3 is a cross-sectional view showing the first valve seat before it is attached to the housing in one embodiment. [Figure 5] FIG. 3 is a perspective view showing the first valve seat before it is attached to the housing in the embodiment. [Figure 6] FIG. 4 is a side view showing the first valve seat before it is attached to the housing in the embodiment. [Figure 7] FIG. 2 is a circuit diagram illustrating an example of use of the valve device according to the embodiment. [Figure 8] FIG. 10 is a partial cross-sectional view showing a state before the valve seat is sandwiched between the first housing and the second housing and fixed thereto, according to a conventional example. [Figure 9] FIG. 10 is a partial cross-sectional view showing a state after the valve seat has been sandwiched between the first housing and the second housing, in a process of fixing the valve seat between the first housing and the second housing according to a conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description of one embodiment of the "valve device" of this disclosed technique will now be given with reference to the accompanying drawings.

[0019] [Outline of the valve device configuration] 1 and 2 are cross-sectional views of the valve device 1. As shown in Figures 1 and 2, the valve device 1 includes a housing 11 having a plurality of flow paths 21 and 22, a valve unit 6 for opening and closing the flow paths in the housing 11, and an actuator 15 fixed to the housing 11 with a bolt 8 for driving the valve unit 6.

[0020] This valve device 1 constitutes a three-way valve, and the housing 11 includes a valve chamber 20 that houses a valve element 13 (described later), one inlet flow path 21, and two outlet flow paths 22. The valve chamber 20 constitutes one end of the inlet flow path 21. The housing 11 corresponds to an example of the "housing" of the technology disclosed herein. In this embodiment, the housing 11 is formed from resin.

[0021] The inlet flow path 21 is a flow path that communicates with the valve chamber 20 and is a flow path that allows fluid to flow into the valve chamber 20. The outlet flow path 22 is a flow path that allows fluid to flow out from 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 leads to the actuator 15 side of the valve chamber 20. The second outlet flow path 222 leads to the opposite side of the valve chamber 20 from the actuator 15. The first outlet flow path 221 corresponds to an example of a "first flow path" in the technology disclosed herein. The inlet flow path 21 corresponds to an example of a "second flow path" in the technology disclosed herein.

[0022] [About housing] The housing 11 is divided into a first housing 111 and a second housing 112. The first housing 111 includes a first outlet flow path 221. The second housing 112 includes a second outlet flow path 222 and an inlet flow path 21.

[0023] [About the valve] The valve unit 6 includes a valve seat 12, a valve element 13, and a valve stem 14. The valve seat 12 provided in the housing 11 includes a first valve seat 121 and a second valve seat 122. The first valve seat 121 is arranged on the first outlet flow path 221 side of the valve chamber 20. The second valve seat 122 is arranged on the second outlet flow path 222 side of the valve chamber 20. Both the first valve seat 121 and the second valve seat 122 are formed in an annular shape. Each of the valve seats 121, 122 has a first valve hole 16 and a second valve hole 17 in its center. The first valve seat 121 is formed of an elastic material such as rubber. The outer periphery of the first valve seat 121 is sandwiched and fixed between the first housing 111 and the second housing 112. The second valve seat 122 is formed of resin integrally with the second housing 112.

[0024] 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 seating on 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, which are arranged at a distance 26 in the axial direction of the valve stem 14. A seal member 18 is provided at the contact portion of the second valve element 132 with the second valve seat 122. This seal member 18 is adapted to contact and separate from the second valve seat 122. On the other hand, no seal member is provided at the contact portion of the first valve element 131 with the first valve seat 121. In this embodiment, the valve element 13 is formed from resin, but it can also be formed from metal. The seal member 18 is formed in a circular disk shape from rubber, but it can also be formed from other elastic materials. If the second valve seat 122 is formed from rubber, the seal member 18 may be omitted.

[0025] The valve shaft 14 is disposed inside the housing 11 and the actuator 15. One end of the valve shaft 14 is disposed in the actuator 15, and the other end of the valve shaft 14 is disposed in the valve chamber 20. The valve shaft 14 is provided integrally with the valve elements 131, 132 so as to move the valve elements 131, 132 in the axial direction relative to the corresponding valve seats 121, 122. The valve shaft 14 is capable of reciprocating in the thrust direction, which is its axial direction. In this embodiment, the valve shaft 14 is formed from resin, but it can also be formed from metal.

[0026] [About the actuator] 1 and 2, the actuator 15 is a member that moves the valve stem 14 in the axial direction together with the valve element 13. The actuator 15 corresponds to an example of the "drive unit" of the disclosed technology. In this embodiment, the actuator 15 includes a movable core 31, a fixed core 32, a bobbin 33, a coil 34, a casing 35, a compression spring 37, etc., and is configured as a "solenoid."

[0027] 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 compression spring 37 is provided between the movable core 31 and the fixed core 32, and urges the movable core 31 downward in Figures 1 and 2.

[0028] 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, and the movable core 31 approaches the fixed core 32 together with the valve stem 14 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, the movable core 31 is not attracted to the fixed core 32, and the movable core 31, together with the valve stem 14, moves away from the fixed core 32 due to the biasing force of the compression spring 37.

[0029] The bobbin 33 is formed in a cylindrical shape, and the coil 34 is wound around the bobbin 33 to form a coil assembly 38. The bobbin 33 is provided so as to surround the movable core 31 and the fixed core 32. After the coil 34 is wound around the bobbin 33, it is molded with resin to form a resin casing 35. The resin casing 35 covers the coil 34 and is molded to the coil assembly 38. A coupler 35a that protrudes laterally is formed integrally with the casing 35. A terminal (not shown) that connects to the coil 34 is disposed on the coupler 35a. The outside of the coil assembly 38 is further covered with a metal outer casing 50.

[0030] The valve 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 shown in FIG. 2 by moving the valve stem 14 in its axial direction using the actuator 15.

[0031] The "first open valve state" refers to 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" refers to 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" refers to a state in which the valve seat 12 and the valve element 13 abut on each other around the entire circumference of one end of the annular valve seat 12, sealing the gap between the valve seat 12 and the valve element 13.

[0032] 1, the fluid introduced from the inlet flow path 21 is discharged from the first outlet flow path 221. In the second open state shown in FIG. 2, the fluid introduced from the inlet flow path 21 is discharged from the second outlet flow path 222.

[0033] [Valve shape] 1 and 2, a predetermined gap 26 is provided between the first valve body 131 and the second valve body 132. In this embodiment, each of the valve bodies 131, 132 has a disk shape on the side facing the corresponding valve seat 121, 122, which is parallel to the facing surface of the corresponding valve seat 121, 122.

[0034] [About the shape of the first valve seat] Next, the shape of the first valve seat 121 of this embodiment will be described. Fig. 3 is an enlarged cross-sectional view showing the connection portion 51 between the first outlet flow path 221 and the inlet flow path 21 (valve chamber 20) in Fig. 1. Fig. 4 is a cross-sectional view showing the first valve seat 121 before being attached to the housing 11. Fig. 5 is a perspective view showing the first valve seat 121 before being attached to the housing 11. Fig. 6 is a side view showing the first valve seat 121 before being attached to the housing 11.

[0035] As shown in Figures 3 and 4, the seal surface 121a of the first valve seat 121 facing the first valve body 131 is flat and annular. Furthermore, a downwardly protruding annular seal ridge 121b is formed on this seal surface 121a around the periphery of the first valve hole 16. The apex line of this seal ridge 121b forms an annular seal line. Furthermore, as shown in Figures 1 and 2, the second valve seat 122 is formed in the second housing 112. The seal surface of the second valve seat 122 facing the second valve body 132 is also flat and annular.

[0036] As shown in FIG. 3, a relief gap 28 is provided in a portion of the opposing surface between the first housing 111 and the first valve seat 121 to relieve stress acting on the first valve seat 121 due to sandwiching between the first housing 111 and the second housing 112. As shown in FIGS. 4 and 5, an annular outer peripheral ridge 121c that protrudes upward is formed on the upper outer peripheral edge of the first valve seat 121. An annular thick step 121e is formed inside the outer peripheral ridge 121c with an annular circumferential groove 121d interposed therebetween. Meanwhile, as shown in FIG. 3, a recess 111a for receiving the step 121e is formed on the lower side of the first housing 111. The relief gap 28 is formed between the inner peripheral wall 11b of the recess 111a and the outer peripheral wall 121f of the step 121e.

[0037] 1 to 3, the first valve seat 121 is disposed at a connection portion 51 between the first outlet flow path 221 and the introduction flow path 21. The maximum inner diameter D1 of the first outlet flow path 221 (recess 111a) at the connection portion 51 is larger than the inner diameter D2 of the valve chamber 20 at the connection portion 51. The step portion 121e of the first valve seat 121 includes an outer peripheral wall 121f having an outer diameter D3 that is smaller than the maximum inner diameter D1 of the first outlet flow path 221 (recess 111a). An escape gap 28 is formed between the inner peripheral wall 111b of the first outlet flow path 221 (recess 111a) having the maximum inner diameter D1 and the outer peripheral wall 121f of the step portion 121e having the outer diameter D3.

[0038] 1 to 6, the first valve seat 121 is provided with a sleeve 121g that extends downward and is capable of fitting into the inner circumferential wall of the valve chamber 20. The inside of this sleeve 121g is pressed against the inner circumferential wall 20a of the valve chamber 20 due to the elasticity of the sleeve 121g.

[0039] [Examples of valve device use] An example of use of the valve device 1 of this embodiment will be described. Fig. 7 shows a circuit diagram of an example of use of the valve device 1 described above. As shown in Fig. 7, in this embodiment, the valve device 1 is used in a cooling system 81 mounted on an electric vehicle 80. In this example of use, the refrigerant flowing through the cooling system 81 corresponds to an example of the "fluid" in the present disclosure. The electric vehicle 80 is, for example, a vehicle that has a motor driven by power from a secondary battery as a drive source for the vehicle and travels by driving the drive wheels with the motor, and includes electric vehicles, hybrid vehicles, etc.

[0040] In this embodiment, the valve device 1 includes a first valve device 82 and a second valve device 83. In addition to the valve devices 82 and 83, the cooling system 81 also includes a heater 84, a battery 85, a DC-DC converter 86, a battery charger 87, a radiator 88, and an electric pump 89. Each of the valve devices 82 and 83 has an inlet 82a or 83a of the introduction flow path 21, a first outlet 82b or 83b of the first outlet flow path 221, and a second outlet 82c or 83c of the second outlet flow path 222. These components 82 to 89 are arranged along a main pipe 90 that circulates the refrigerant. The main pipe 90 includes a first pipe section 90a, a second pipe section 90b, and a third pipe section 90c.

[0041] A discharge port 89a of the electric pump 89 is connected to an inlet 82a of the first valve device 82 via a first piping section 90a. A second outlet 82c of the first valve device 82 is connected to an inlet 83a of the second valve device 83 via a second piping section 90b. A heater 84, a battery 85, a DC-DC converter 86, and a battery charger 87 are arranged in this order from the upstream side in the second piping section 90b. The first outlet 82b of the first valve device 82 is connected to the second piping section 90b via a first bypass piping 91, immediately upstream of the DC-DC converter 86. The second outlet 83c of the second valve device 83 is connected to an intake port 89b of the electric pump 89 via a third piping section 90c. A radiator 88 is arranged in the third piping section 90c. The first outlet 83b of the second valve device 83 is connected to the third piping section 90c immediately upstream of the suction port 89b of the electric pump 89 via a second bypass piping 92.

[0042] In the cooling system 81, the flow of the refrigerant to each of the members 84 to 88 is switched by starting the electric pump 89 and driving the valve devices 82 and 83 to switch the flow paths.

[0043] In this embodiment, first to third flow path patterns are switched by switching the flow path using the valve devices 82 and 83. Here, the first flow path pattern is switched to when overheating and overcooling of the battery 85 is to be prevented. In this first flow path pattern, the electric pump 89 is started and the heater 84 is turned off, the first valve device 82 is switched to the first outlet 82b, and the second valve device 83 is switched to the second outlet 83c. As a result, the refrigerant discharged from the electric pump 89 flows from the first valve device 82 through the first bypass pipe 91, the second pipe section 90b, and the third pipe section 90c, sequentially through the DC-DC converter 86, the battery charger 87, the second valve device 83, and the radiator 88, and returns to the suction port 89b of the electric pump 89, repeating this circuit. This first flow path pattern is switched to when driving at low speed in spring and autumn, and is used to prevent the temperature of the battery 85 from increasing. are kept at an appropriate level.

[0044] The second flow path pattern is switched to when cooling or waste heat superheating the battery 85. In this second flow path pattern, the electric pump 89 is started, the heater 84 is turned off, the first valve device 82 is switched to the second outlet 82c, and the second valve device 83 is switched to the second outlet 83c. As a result, the refrigerant discharged from the electric pump 89 flows from the first valve device 82 through the second piping section 90b and the third piping section 90c, sequentially through the heater 84, the battery 85, the DC-DC converter 86, the battery charger 87, the second valve device 83, and the radiator 88, and returns to the suction port 89b of the electric pump 89, repeating this circuit. The second flow path pattern is switched to when the temperature is high in summer or when the battery 85 is generating heat, to cool the battery 85.

[0045] The third flow path pattern is switched to when the battery 85 is heated by the heater 84. In this third flow path pattern, the electric pump 89 is started and the heater 84 is turned on, the first valve device 82 is switched to the second outlet 82c, and the second valve device 83 is switched to the first outlet 83b. As a result, the refrigerant discharged from the electric pump 89 flows from the first valve device 82 through the second piping section 90b, the second bypass piping 92, and the third piping section 90c, sequentially through the heater 84, the battery 85, the DC-DC converter 86, the battery charger 87, and the second valve device 83, and returns to the suction port 89b of the electric pump 89, repeating this circuit. The third flow path pattern is switched to when the temperature is low in winter or when it is desired to quickly warm up the battery 85.

[0046] The battery 85 of the electric vehicle 80 has a characteristic that its performance deteriorates outside a certain temperature range. Therefore, in this embodiment, the temperature of the battery 85 and the refrigerant is monitored, and the above-mentioned flow path patterns are switched so that the temperature of the battery 85 is kept within the range of 25 to 35°C.

[0047] [About the function and effect of the valve device] According to the configuration of the valve device 1 of this embodiment described above, the valve device 1 includes a housing 11 including flow paths 21 and 22, a valve unit 6 that opens and closes the flow paths 21 and 22, and an actuator 15 fixed to the housing 11 for driving the valve unit 6. The valve unit 6 also includes a valve seat 12 that is provided in the flow paths 21 and 22 of the housing 11 and has valve holes 16 and 17 in its center, a valve element 13 that opens and closes the valve holes 16 and 17 by seating on and separating from the valve seat 12, and a valve shaft 14 on which the valve element 13 is provided to move the valve element 13 in the axial direction relative to the valve seat 12. The housing 11 includes a first housing 111 and a second housing 112. The valve seat 12 includes a first valve seat 121 and a second valve seat 122. The valve element 13 includes a first valve element 131 and a second valve element 132. In this configuration, the first valve seat 121 is made of an elastic material. The outer periphery of the first valve seat 121 is sandwiched and fixed between the first housing 111 and the second housing 112. Furthermore, an escape gap 28 for releasing deformation of the first valve seat 121 is provided in a part of the opposing surfaces of the first housing 111 and the first valve seat 121. Here, the escape gap 28 is defined between the inner periphery wall 111b of the first outlet flow path 221 (recess 111a) having the maximum inner diameter D1 and the outer periphery wall 121f of the step portion 121e of the first valve seat 121. Therefore, even if the first valve seat 121 is crushed between the first housing 111 and the second housing 112 and stress acts on the first valve seat 121, deformation due to the stress is released into the escape gap 28. Therefore, even if first valve seat 121 is sandwiched between first housing 111 and second housing 112, it is possible to suppress warping of first valve seat 121 due to the action of stress, and reduce deviation of the seal line of first valve seat 121. As a result, it is possible to prevent poor sealing between first valve body 131 and first valve seat 121.

[0048] According to the configuration of this embodiment, the sleeve portion 121g of the first valve seat 121 is fitted into the inner circumferential wall 20a of the introduction flow path 21 (valve chamber 20), thereby further suppressing warping of the first valve seat 121. This further reduces deviation of the seal line of the first valve seat 121.

[0049] In addition, according to the configuration of this embodiment, as a valve device 1 (82, 83) used in a cooling system 81 mounted on an electric vehicle 80, the same action as that described above can be obtained, and the same effect as that described above can be obtained.

[0050] <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.

[0051] In the above embodiment, the valve device 1 is configured as a three-way valve having three flow paths 21, 221, 222, two valve seats 121, 122, and two valve bodies 131, 132. However, the valve device can also be configured as a two-way valve having two flow paths, one valve seat, and one valve body. [Industrial Applicability]

[0052] The disclosed technology can be used in fluid circuits of cooling systems mounted on electric vehicles and the like. [Explanation of symbols]

[0053] 1 Valve gear 6 Valve section 11 Housing (Housing) 111 First Housing 111a recess (first flow path) 111b Inner wall 112 Second Housing 12 Valve seat 121 First valve seat 121e Stepped section 121f outer wall 121g sleeve part 122 Second valve seat 13 Valve body 131 First valve body 132 Second valve body 14 Valve stem 15 Actuator (drive unit) 20 Valve chamber (second flow path) 20a Inner wall 21 Inlet flow path (second flow path) 22 Outlet flow path (flow path) 221 First outlet flow path (first flow path) 222 Second outlet flow path (flow path) 28 Relief gap 51 Connecting part 82 First valve device (valve device) 83 Second valve gear (valve gear) D1 Maximum inner diameter D2 Valve chamber inner diameter D3 outer diameter

Claims

1. a housing containing a flow path; a valve portion for opening and closing the flow path of the housing; a drive portion fixed to the housing for driving the valve portion; Equipped with The valve portion is a valve seat provided in the flow path of the housing and having a valve hole; a valve body that opens and closes the valve hole by being seated on and separated from the valve seat; a valve shaft on which the valve element is provided so as to move the valve element in an axial direction relative to the valve seat; In a valve device comprising: The housing is composed of a first housing and a second housing, the valve seat is made of an elastic body, and an outer periphery of the valve seat is sandwiched and fixed between the first housing and the second housing, A relief gap is provided in a part of the opposing surface between the first housing and the valve seat to relieve stress acting on the valve seat due to sandwiching between the first housing and the second housing. A valve device characterized by:

2. The valve device according to claim 1, The first housing is provided with a first flow path that constitutes the flow path, The second housing is provided with a second flow path that constitutes the flow path, the valve seat is disposed at a connection portion between the first flow path and the second flow path, a maximum inner diameter of the first flow path at the connecting portion is larger than an inner diameter of the second flow path at the connecting portion; the valve seat includes a step having an outer diameter smaller than the maximum inner diameter of the first flow path, The relief gap is formed between an inner peripheral wall of the first flow path having the maximum inner diameter and an outer peripheral wall of the step portion of the valve seat. A valve device characterized by:

3. 3. The valve device according to claim 2, The valve seat is provided with a sleeve portion that can be fitted into an inner circumferential wall of the second flow path. A valve device characterized by:

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