Valve device

Abstract

To provide a valve device capable of ensuring the sealability between a valve seat and a valve element when a valve is closed.SOLUTION: In an aspect of the present disclosure, in a valve device 1, a first valve 131 comprises a rubber seal 60 and a convex part 70. An end surface on the protruding side of the convex part 70 is formed in a convex part tapered surface 71. A surface on a valve hole 16 side in the tip portion of a valve hole edge part 40 of a first seat 121 is formed in a valve hole edge part tapered surface 42. An inclination angle θ1 of the convex part tapered surface 71 with respect to a seal surface 61 is larger than an inclination angle θ3 of the valve hole edge part tapered surface 42 with respect to the seal surface 61. A convex part corner portion 72, at which an outer diameter of the first valve 131 becomes minimum at the convex part tapered surface 71, is located on an inner side in a radial direction of a valve hole 16 than a valve hole edge part tapered surface minimum diameter portion 44 where an inner diameter of the valve hole 16 becomes minimum at the valve hole edge part tapered surface 42.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a valve device that opens and closes a flow path of a fluid (for example, cooling water). [Background technology]

[0002] Patent Document 1 discloses a valve device in which, when the poppet moves from an open position (i.e., a position away from the valve seat) to a closed position (i.e., abutting the valve seat via the poppet seal member), the poppet seal member arranged on the poppet stem moves sideways to align the seal surface with the seat surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2017-535731 Summary of the Invention [Problem to be solved by the invention]

[0004] In the valve device of Patent Document 1, in order to allow the poppet seal member to move laterally, it is necessary to provide a gap between the poppet stem and the central hole of the seal member. As a result, when the poppet is in the closed position and the valve is closed, fluid may leak from the gap between the poppet stem and the central hole of the seal member. As a result, it may not be possible to ensure sealing between the valve seat and the poppet (i.e., the valve body) when the valve is closed.

[0005] Therefore, the present disclosure has been made to solve the above-mentioned problems, and has an object to provide a valve device that can ensure sealing between the valve seat and the valve body when the valve is closed. [Means for solving the problem]

[0006] One aspect of the present disclosure made to solve the above problems is a valve device having a valve seat, a valve disc, and a valve stem on which the valve disc is provided, the valve seat comprises a valve hole, and a valve hole edge portion formed at the edge of the valve hole so as to protrude towards a central axis of the valve hole, and as the valve stem moves in the central axis direction of the valve shaft, the valve disc abuts against and moves away from the valve hole edge portion to open and close the valve hole, and the valve disc comprises a seal member having a seal surface against which a tip of the valve hole edge portion abuts when the valve hole is closed and the valve is closed, and a protrusion formed on the seal surface so as to protrude from a side surface of the valve stem in a radial direction of the valve hole, and an end face of the protruding portion is the valve hole edge portion has a convex tapered surface formed in a tapered shape such that the outer diameter of the valve disc increases toward the sealing surface, the surface of the valve hole side at the tip of the valve hole edge portion has a valve hole edge tapered surface formed in a tapered shape such that the inner diameter of the valve hole increases toward the tip, the inclination angle of the convex tapered surface with respect to the sealing surface is greater than the inclination angle of the valve hole edge tapered surface with respect to the sealing surface, and a convex corner portion on the convex tapered surface where the outer diameter of the valve disc is smallest is located radially inward of the valve hole than a valve hole edge tapered surface minimum diameter portion on the valve hole edge tapered surface where the inner diameter of the valve hole is smallest.

[0007] According to this aspect, even if the valve stem is tilted and the positional deviation of the valve disc becomes large when the valve device performs a valve closing operation, the convex part of the valve disc is pressed against the valve hole edge part of the valve seat, so that the valve disc moves and the position of the valve disc is adjusted. This allows the tip of the valve hole edge part to abut against the sealing surface of the sealing member to close the valve device. Therefore, when the valve is closed (when the valve device is in the valve closed state), the tip of the valve hole edge part of the valve seat can abut against the sealing surface of the sealing member of the valve disc, so that the sealing performance between the valve seat and the valve disc can be ensured. Therefore, when the valve is closed, leakage of cooling water between the valve seat and the valve disc can be suppressed. In addition, when the valve device performs a valve closing operation, the tip of the valve hole edge part can be seated without abutting against the convex part of the valve disc, so that the wear and breakage of the tip of the valve hole edge part, which is important when sealing (sealing) between the valve seat and the valve disc, can be prevented, and the sealing performance between the valve seat and the valve disc can be ensured.

[0008] In the above aspect, it is preferable that the valve hole edge portion has a contact surface formed between the valve hole edge tapered surface and the inner wall surface of the valve hole, and the inclination angle of the contact surface relative to the sealing surface is equal to or approximately equal to the inclination angle of the convex tapered surface relative to the sealing surface.

[0009] According to this embodiment, the contact area between the tapered surface of the convex portion and the contact surface of the valve hole edge portion can be increased, thereby reducing the contact pressure. Also, due to the floating effect caused by the flow of fluid between the tapered surface of the convex portion and the contact surface of the valve hole edge portion, the tapered surface of the convex portion and the contact surface of the valve hole edge portion are in a substantially non-contact state. Therefore, the friction generated between the tapered surface of the convex portion and the contact surface of the valve hole edge portion can be reduced.

[0010] In the above aspect, it is preferable that the tip of the valve hole edge portion is formed in a convex shape.

[0011] According to this aspect, when the valve is closed, the area of ​​contact between the valve hole edge and the seal surface of the seal member can be reduced to increase the contact pressure, thereby improving the sealing performance between the valve seat and the valve body when the valve is closed.

[0012] In the above aspect, it is preferable that the valve device is a device that is mounted in a flow path of cooling water for an electric vehicle.

[0013] According to this aspect, since the sealing between the valve seat and the valve body can be ensured when the valve is closed to reduce fluid leakage, the flow rate of the cooling water can be controlled with high precision. Therefore, the cooling water can be supplied at the flow rate required by the electric vehicle. This improves the energy efficiency of the electric vehicle and contributes to carbon neutrality. Effect of the Invention

[0014] According to the valve device of the present disclosure, it is possible to ensure sealing between the valve seat and the valve body when the valve is closed. [Brief description of the drawings]

[0015] [Figure 1]2 is a diagram showing the valve device of the present embodiment (a first valve open state, and a second seat and a second valve closed state). FIG. [Diagram 2] 3 is a diagram showing the valve device of the present embodiment (second valve open state, first seat and first valve closed state). FIG. [Diagram 3] FIG. 3 is an enlarged view of region α in FIG. 2 in the first embodiment. [Figure 4] FIG. 4 is an enlarged view of a region β in FIG. 3 in the first embodiment. [Diagram 5] FIG. 11 is a diagram illustrating a state in which the valve shaft is tilted and the amplitude of the first valve is increased in the first embodiment. [Figure 6] FIG. 10(A) is a diagram showing the dimensions of a comparative example (the example shown in FIG. 9), and FIG. 10(B) is a diagram showing the dimensions of the first embodiment. [Figure 7] FIG. 11 is a diagram of the second embodiment corresponding to FIG. 4 of the first embodiment. [Figure 8] FIG. 11 is a diagram showing a floating effect in the second embodiment. [Figure 9] FIG. 13 is a diagram showing a comparative example in which the protruding width of the rubber seal is made larger than the deflection width of the first valve.

[0016] A valve device 1 according to an embodiment of the present disclosure will be described.

[0017] (Outline of valve mechanism) An overview of the valve device 1 of this embodiment will be described. The valve device 1 is a device that is mounted in a coolant flow path of, for example, an electric vehicle (not shown) and controls the flow rate of the coolant. Note that an "electric vehicle" is, for example, a vehicle that is driven by power from a secondary battery as the drive source of the vehicle, such as an electric car or a hybrid vehicle.

[0018] As shown in FIGS. 1 and 2, the valve device 1 has a body 11 (ie, a housing) having a flow passage, a seat 12, a valve 13, a valve shaft 14, and an actuator 15.

[0019] The seat 12 (i.e., a first seat 121 and a second seat 122 described below) is an example of a "valve seat" in the present disclosure. The valve 13 (i.e., a first valve 131 and a second valve 132 described below) is an example of a "valve body" in the present disclosure. The valve shaft 14 is an example of a "valve stem" in the present disclosure.

[0020] The body 11 includes an internal flow passage 20 that houses the valve 13, one inflow flow passage 21, and two outflow flow passages 22. In this manner, the valve device 1 is a three-way valve that includes one inflow flow passage 21 and two outflow flow passages 22. The body 11 is made of resin.

[0021] The inflow passage 21 is a passage that is connected to the internal passage 20 and that allows the cooling water to flow into the internal passage 20 .

[0022] The outflow passage 22 is a passage for discharging the cooling water from the internal passage 20. A first outflow passage 221 and a second outflow passage 222 are provided as the two outflow passages 22. The first outflow passage 221 is provided on the actuator 15 side with respect to the internal passage 20. The second outflow passage 222 is provided on the opposite side of the internal passage 20 to the actuator 15.

[0023] In this embodiment, a first sheet 121 and a second sheet 122 are provided as the sheet 12. The first sheet 121 is disposed on the first outflow passage 221 side of the internal passage 20. The second sheet 122 is disposed on the second outflow passage 222 side of the internal passage 20. Both the first sheet 121 and the second sheet 122 are formed in an annular shape and have a circular valve hole 16 in the center.

[0024] 1 to 3, the first sheet 121 has a valve hole 16 and a valve hole edge portion 40. The valve hole edge portion 40 is formed in an annular shape in the circumferential direction at the edge of the valve hole 16, and is formed to protrude in the central axial direction of the valve hole 16 (the downward direction in Figs. 1 to 3).

[0025] Although the sheet 12 is made of resin, it may be made of rubber.

[0026] 1 and 2, the valve 13 is provided on the valve shaft 14, and opens and closes the valve hole 16 by coming into contact with and moving away from the seat 12. In this embodiment, the valve 13 includes a first valve 131 and a second valve 132 that are spaced apart in the axial direction of the valve shaft 14. The first valve 131 is provided on the first seat 121 side, and the second valve 132 is provided on the second seat 122 side.

[0027] As shown in FIG. 3, the first valve 131 includes a rubber seal 60 and a protrusion 70.

[0028] The rubber seal 60 abuts against and separates from the first sheet 121. The rubber seal 60 has a sealing surface 61 that abuts against the tip 41 of the valve hole edge portion 40 of the first sheet 121 when the valve is closed and the valve hole 16 on the first sheet 121 side is closed. The rubber seal 60 is an example of a "sealing member" in the present disclosure. The tip 41 of the valve hole edge portion 40 may be formed in an R-shape.

[0029] The protrusion 70 is formed on the seal surface 61 so as to protrude from the side surface of the valve shaft 14 toward the outside in the radial direction of the valve hole 16 (to both the left and right sides in FIGS. 1 and 2, and the left side in FIG. 3).

[0030] As shown in FIGS. 1 and 2, the rubber seal 80 of the second valve 132 comes into contact with and separates from the second seat 122.

[0031] Although the valve 13 is made of resin except for the rubber seal 60 and the rubber seal 80, it may be made of metal.

[0032] 1 and 2, the valve shaft 14 is disposed inside the body 11. The valve shaft 14 is provided between the actuator 15 and the second valve 132. The valve shaft 14 is supported by a bearing 17. Although the valve shaft 14 is made of metal, it may be made of resin.

[0033] In this embodiment, the valve 13 is provided at one end of the valve shaft 14 in the axial direction of the valve shaft 14. The valve shaft 14 is movable in a thrust direction, which is the axial direction of the valve shaft 14 (i.e., the central axial direction).

[0034] The actuator 15 is a drive unit that moves the valve shaft 14 in the axial direction of the valve shaft 14. In this embodiment, the actuator 15 includes a movable core 31, a fixed core 32, a bobbin 33, a coil 34, a casing 35, and the like.

[0035] The movable core 31 moves integrally with the valve shaft 14, thereby moving the valve shaft 14 in the axial direction (central axis direction) of the valve shaft 14. The fixed core 32 is disposed opposite the movable core 31 in the axial direction of the valve shaft 14.

[0036] The movable core 31 and the fixed core 32 are made of a magnetic material (for example, a 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 a magnetic force, and the movable core 31 approaches the fixed core 32. 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 does not approach the fixed core 32.

[0037] The bobbin 33 is formed in a cylindrical shape, and has the movable core 31 and the fixed core 32 provided inside and the coil 34 provided outside. The bobbin 33, the coil 34, etc. are molded and covered with resin to form a resin casing 35.

[0038] The valve device 1 configured as described above can be switched between a first open state shown in FIG. 1 and a second open state shown in FIG. 2 by moving the valve shaft 14 in the axial direction of the valve shaft 14 using the actuator 15.

[0039] Here, the "first open state" refers to a state in which the first seat 121 and the first valve 131 are open, and the second seat 122 and the second valve 132 are closed. Also, the "second open state" refers to a state in which the first seat 121 and the first valve 131 are closed, and the second seat 122 and the second valve 132 are open. In the closed state, the seat 12 and the valve 13 are in contact over the entire circumferential direction of the annular seat 12, and the gap between the seat 12 and the valve 13 is sealed, resulting in a fully closed state.

[0040] 1, the cooling water introduced from the inflow passage 21 is discharged from the first outflow passage 221. In addition, in the second open state shown in FIG. 2, the cooling water introduced from the inflow passage 21 is discharged from the second outflow passage 222.

[0041] Thus, in this embodiment, as the valve shaft 14 moves in the central axial direction of the valve shaft 14, the first valve 131 abuts against and moves away from the valve hole edge portion 40 of the first seat 121 to open and close the valve hole 16 of the first seat 121, and the second valve 132 abuts against and moves away from the second seat 122 to open and close the valve hole 16 of the second seat 122.

[0042] (Measures to prevent valve vibration caused by valve shaft tilt) Next, measures against vibration of the valve 13 caused by the inclination of the valve shaft 14 will be described.

[0043] For example, abnormal wear on the valve shaft 14 or the bearing 17 may increase the amount of inclination of the valve shaft 14 (i.e., the amount of inclination with respect to the central axis). If the amount of inclination of the valve shaft 14 increases in this way, the amplitude of the valve 13's deflection (i.e., the amount of positional deviation) will increase.

[0044] In this case, in order to ensure that the tip 41 of the valve hole edge portion 40 of the first seat 121 abuts against the sealing surface 61 of the rubber seal 60 of the first valve 131 when the first seat 121 and the first valve 131 are closed (i.e., in the second open state), it is possible to make the rubber seal protrusion width L1 larger than the swing width of the first valve 131, as shown in Figure 9.

[0045] However, when the rubber seal protrusion width L1 is increased, there is a risk that the rubber seal 60 may turn over due to the influence of the flow of the cooling water. In addition, when the outer diameter φD2 of the protrusion 70 is reduced and the rubber seal protrusion width L1 is increased, the inner diameter of the rubber seal 60 is reduced to ensure the amount of the rubber seal 60 sandwiched in the first valve 131, which may increase the assembly load of the rubber seal 60 when the rubber seal 60 is assembled to the first valve 131, which may result in a decrease in the assembly performance of the rubber seal 60. Furthermore, when the rubber seal protrusion width L1 is increased, there is a risk that the pressure loss of the cooling water may increase due to the expansion of the outer diameter φD1 of the rubber seal 60. In this way, various problems may occur by increasing the rubber seal protrusion width L1.

[0046] Therefore, in this embodiment, measures against the vibration of the valve 13 due to the inclination of the valve shaft 14 are taken by the following embodiment.

[0047] <First Example> First, in the first embodiment, when the inclination angles θ1, θ2, and θ3 are defined as shown in Fig. 4, the relationship shown in the following formula is established. Note that Figs. 1 to 4 show a state in which the valve shaft 14 is not inclined and no positional deviation of the first valve 131 occurs. [Number 1] θ2>θ1>θ3

[0048] Here, the inclination angle θ1 is the inclination angle of the convex tapered surface 71 with respect to the seal surface 61 of the rubber seal 60 of the first valve 131, as shown in Fig. 4. The convex tapered surface 71 is the end face on the protruding side (the left side in Fig. 4) of the convex portion 70, and is formed in a tapered shape such that the outer diameter of the first valve 131 increases as it approaches the seal surface 61.

[0049] 4, the inclination angle θ2 is the inclination angle of the tapered surface 43 with respect to the seat surface 50 of the first seat 121. The seat surface 50 is the end surface of the annular first seat 121 on the valve 13 side in the central axial direction. The tapered surface 43 is the surface between the valve hole edge tapered surface 42 and the inner wall surface 90 of the valve hole 16 on the first seat 121 side.

[0050] 4, the inclination angle θ3 is the inclination angle of the valve hole edge tapered surface 42 with respect to the seal surface 61 of the rubber seal 60 of the first valve 131 when there is no misalignment of the first valve 131. The valve hole edge tapered surface 42 is the surface on the valve hole 16 side at the tip of the valve hole edge 40 (i.e., the tip 41 and its surrounding area), and is formed in a tapered shape such that the inner diameter of the valve hole 16 increases toward the tip 41.

[0051] In this embodiment, as shown in FIG. 4, the convex corner portion 72 is located radially inward of the valve hole 16 (to the right in FIG. 4) relative to the valve hole edge tapered surface minimum diameter portion 44.

[0052] Here, the convex corner portion 72 is the portion on the convex tapered surface 71 where the outer diameter of the first valve 131 is smallest. Also, the valve hole edge tapered surface minimum diameter portion 44 is the portion on the valve hole edge tapered surface 42 where the inner diameter of the valve hole 16 is smallest. Note that the valve hole edge tapered surface minimum diameter portion 44 may be formed in an R shape.

[0053] Thus, in this embodiment, in the cross section shown in Figure 4 (i.e., the cross section in the central axis direction of the first seat 121 or the first valve 131), the inclination angle θ1 is greater than the inclination angle θ3, and the convex corner portion 72 is located radially inward of the valve hole 16 relative to the valve hole edge tapered surface minimum diameter portion 44.

[0054] As a result, even if the amount of inclination of the valve shaft 14 increases and the amplitude of the valve 13 becomes large, the tip 41 of the valve hole edge portion 40 of the first seat 121 can abut against the sealing surface 61 of the rubber seal 60 of the first valve 131.

[0055] In other words, when the valve device 1 performs a valve closing operation, even if the inclination amount of the valve shaft 14 increases and the amplitude of the first valve 131 increases as shown in FIG. 5 (in FIG. 5, the first valve 131 is significantly misaligned to the left side of the drawing), the convex portion 70 of the first valve 131 is pressed by the valve hole edge portion 40 of the first seat 121, so that the first valve 131 moves to the right side in FIG. 5, and the position of the first valve 131 is adjusted.

[0056] As a result, the tip 41 of the valve hole edge portion 40 can be brought into contact with the seal surface 61 as shown in Fig. 3 and Fig. 4 without coming into contact with the protrusion 70, and the valve device 1 can be brought into a closed state. Therefore, when the first seat 121 and the first valve 131 are closed, the tip 41 of the valve hole edge portion 40 of the first seat 121 can be brought into contact with the seal surface 61 of the rubber seal 60 of the first valve 131 without coming into contact with the protrusion 70 and being worn, so that the sealing performance between the first seat 121 and the first valve 131 can be ensured. Therefore, when the first seat 121 and the first valve 131 are closed, leakage of the cooling water between the first seat 121 and the first valve 131 can be suppressed.

[0057] In this embodiment, the inclination angle θ2 is greater than the inclination angle θ1 and the inclination angle θ3.

[0058] As a result, when the convex portion 70 of the first valve 131 is pressed against the valve hole edge portion 40 of the first seat 121 and the first valve 131 moves, the convex portion tapered surface 71 of the first valve 131 is pressed against the valve hole edge tapered surface minimum diameter portion 44 of the first seat 121, so that the position of the first valve 131 can be adjusted more effectively.

[0059] In this embodiment, the valve hole edge 40 is provided with a ridge ring including a valve hole edge tapered surface 42. That is, in a cross section of the first sheet 121 in the central axis direction, the tip of the valve hole edge 40 (i.e., the tip 41 and its surrounding area) is formed in a convex shape.

[0060] As a result, when the first seat 121 and the first valve 131 are closed, the area of ​​the contact portion between the valve hole edge portion 40 and the sealing surface 61 can be reduced, thereby increasing the surface pressure. Therefore, when the first seat 121 and the first valve 131 are closed, the sealing performance between the first seat 121 and the first valve 131 can be more effectively ensured.

[0061] Also, as shown in Fig. 6(A), the comparative example (see Fig. 9) attempts to accommodate the vibration of the first valve 131 by preventing the valve hole edge 40 of the first seat 121 from hitting the protrusion 70 of the first valve 131, resulting in a large rubber seal protrusion width L1. In contrast, as shown in Fig. 6(B), this embodiment attempts to accommodate the vibration of the first valve 131 by allowing the valve hole edge 40 of the first seat 121 to hit the protrusion 70 of the first valve 131, thereby making it possible to reduce the rubber seal protrusion width L1.

[0062] As a result, the outer diameter φD1 of the rubber seal 60 of the first valve 131 can be made smaller in the present embodiment shown in Fig. 6(B) than in the comparative example shown in Fig. 6(A). Also, the outer diameter φD2 of the protrusion 70 of the first valve 131 can be made larger in the present embodiment shown in Fig. 6(B) than in the comparative example shown in Fig. 6(A). Also, the inner diameter φD3 of the rubber seal 60 of the first valve 131 can be made larger in the present embodiment shown in Fig. 6(B) than in the comparative example shown in Fig. 6(A).

[0063] Such a valve device 1 is mounted in a flow path of cooling water for an electric vehicle.

[0064] This ensures a seal between first seat 121 and first valve 131 when first seat 121 and first valve 131 are closed, reducing leakage of cooling water, and thus allows the flow rate of cooling water to be controlled with high precision. This makes it possible to flow cooling water at a flow rate required by the electric vehicle. This improves the energy efficiency of the electric vehicle, contributing to carbon neutrality.

[0065] <Second Example> Next, a second embodiment will be described. The differences from the first embodiment will be described, and the description of the points in common with the first embodiment will be omitted.

[0066] In this embodiment, as shown in Fig. 7, the valve hole edge 40 has a ground contact surface 45. This ground contact surface 45 is provided between the valve hole edge tapered surface 42 and an inner wall surface 90 (more specifically, tapered surface 43) of the valve hole 16 on the first seat 121 side. The inner wall surface 90 of the valve hole 16 is the inner wall surface that is located on the first seat 121 closer to the inside in the central axis direction of the valve hole 16 than the valve hole edge 40 (upper side in Fig. 7).

[0067] 7 (i.e., a cross section in the central axis direction of first seat 121 and first valve 131), inclination angle θ4 is equal to or approximately equal to inclination angle θ1. Note that inclination angle θ4 is the inclination angle of contact surface 45 with respect to seal surface 61 of rubber seal 60 of first valve 131 when no positional displacement of first valve 131 occurs as shown in FIG.

[0068] This makes it possible to increase the area of ​​the contact portion between the convex tapered surface 71 and the contact surface 45 of the valve hole edge 40, thereby reducing the contact pressure. In addition, as shown in Figure 8, a floating effect occurs when cooling water flows between the convex tapered surface 71 and the contact surface 45 of the valve hole edge 40 as shown by the arrows in the figure, so that the convex tapered surface 71 and the contact surface 45 of the valve hole edge 40 are substantially out of contact with each other.

[0069] Therefore, when the valve device 1 performs a valve closing operation, the tip 41 of the valve hole edge 40 of the first seat 121 abuts against the seal surface 61 of the rubber seal 60 of the first valve 131, while the convex tapered surface 71 and the contact surface 45 of the valve hole edge 40 remain in a substantially non-contact state. This makes it possible to reduce friction generated between the convex tapered surface 71 and the contact surface 45 of the valve hole edge 40.

[0070] It should be noted that the above-described embodiments are merely examples and do not limit the present disclosure in any way. Needless to say, various improvements and modifications are possible without departing from the spirit and scope of the present disclosure.

[0071] For example, in the above explanation, a method for ensuring a seal between the first seat 121 and the first valve 131 was described, but this method can also be applied to ensuring a seal between the second seat 122 and the second valve 132.

[0072] That is, the second sheet 122 may have a valve hole edge portion, and the second valve 132 may come into contact with and separate from the valve hole edge portion of the second sheet 122 to open and close the valve hole 16 of the second sheet 122 .

[0073] The inclination angle of the convex tapered surface of the second valve 132 relative to the sealing surface of the rubber seal 80 of the second valve 132 may be greater than the inclination angle of the tapered surface of the valve hole edge of the second seat 122 relative to the sealing surface of the rubber seal 80, and the corner of the convex portion of the second valve 132 may be located radially inward of the valve hole 16 further than the minimum diameter portion of the tapered surface of the valve hole edge of the second seat 122.

[0074] In the above description, an example has been shown in which cooling water flows through the internal flow passage 20, the inflow flow passage 21, and the outflow flow passage 22, but it is also possible to flow a fluid such as a liquid or gas other than cooling water. [Explanation of symbols]

[0075] 1 Valve gear 11 Body 12 sheets 121 Sheet 1 122 2nd Sheet 13 Valve 131 First Valve 132 Second Valve 14 Valve shaft 15 Actuators 16 Valve hole 20 Internal flow path 21 Inlet Channel 22 Outlet Channel 221 First Outlet Channel 222 Second Outlet Channel 40 Valve hole edge 41 Tip 42 Tapered surface of valve hole edge 44 Valve hole edge tapered surface minimum diameter part 45 Ground plane 60 Rubber seal 61 Sealing surface 70 Convex 71 Convex tapered surface 72 Convex corner 90 Inner wall surface θ1 (inclination angle of convex tapered surface relative to sealing surface) θ3 (the inclination angle of the taper surface of the valve hole edge relative to the sealing surface) θ4 (Inclination angle of the contact surface relative to the sealing surface)

Claims

1. A valve seat; A valve body, a valve shaft on which the valve body is provided, the valve seat includes a valve hole and a valve hole edge portion formed at an edge of the valve hole so as to protrude toward a central axis direction of the valve hole, When the valve shaft moves in the direction of the central axis of the valve shaft, the valve body comes into contact with and separates from the valve hole edge portion to open and close the valve hole, the valve body comprises: a seal member having a seal surface with which a tip of the valve hole edge portion abuts when the valve hole is closed; and a convex portion formed on the seal surface and protruding from a side surface of the valve stem in a radial direction of the valve hole, The end surface of the protruding portion on the protruding side is a protruding tapered surface formed in a tapered shape such that the outer diameter of the valve body increases as it approaches the seal surface, a surface on the valve hole side at a tip end of the valve hole edge portion is a valve hole edge tapered surface formed in a tapered shape such that an inner diameter of the valve hole increases toward the tip end, an inclination angle of the convex tapered surface relative to the seal surface is greater than an inclination angle of the valve hole edge tapered surface relative to the seal surface, and, a convex corner portion at which the outer diameter of the valve body is smallest on the convex tapered surface is located radially inward of the valve hole with respect to a valve hole edge tapered surface minimum diameter portion at which the inner diameter of the valve hole is smallest on the valve hole edge tapered surface; A valve device comprising:

2. The valve device according to claim 1, the valve hole edge portion includes a ground surface formed between the valve hole edge tapered surface and an inner wall surface of the valve hole, an inclination angle of the contact surface with respect to the seal surface is equal to or substantially equal to an inclination angle of the convex tapered surface with respect to the seal surface; A valve device comprising:

3. The valve device according to claim 1 or 2, The tip of the valve hole edge portion is formed in a convex shape; A valve device comprising:

4. The valve device according to claim 1 or 2, the valve device is a device to be mounted in a flow path of cooling water for an electric vehicle; A valve device comprising:

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