Valve device

Abstract

In a valve device in which a valve seat is provided with a valve hole and a valve hole edge portion, and a valve shaft moves in the direction of the central axis of the valve shaft so that a valve body comes into contact with and separates from the valve hole edge portion to open and close the valve hole, the valve body is provided with a sealing member and a convex portion, the end surface of the convex portion on the protruding side becomes a convex portion conical surface, and the valve shaft moves in the direction of the central axis of the valve shaft. The valve hole side surface at the top end part of the valve hole edge part forms a valve hole edge part conical surface, and the inclined angle of the convex part conical surface relative to the sealing surface is larger than the inclined angle of the valve hole edge part conical surface relative to the sealing surface. A convex portion corner portion where the outer diameter of the valve body is smallest among the convex portion conical surfaces is located further inward in the radial direction of the valve hole than a valve hole edge conical surface smallest diameter portion where the inner diameter of the valve hole is smallest among the valve hole edge conical surfaces.

Description

Technical Field

[0001] This disclosure relates to valve devices for opening and closing the flow path of fluids (e.g., cooling water). Background Technology

[0002] Patent document 1 discloses a valve device in which, when the lift valve moves from the open position (i.e., the position separated from the valve seat) to the closed position (i.e., the position abutting against the valve seat through the lift valve sealing member), the lift valve sealing member disposed on the lift valve stem moves laterally so that the sealing surface is aligned with the seat surface.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2017-535731 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In the valve device of Patent Document 1, a gap needs to be provided between the lift valve stem and the central hole of the sealing member in order to allow the lifting valve sealing member to move laterally. Therefore, when the lift valve is in the closed position, fluid may leak through the gap between the lift valve stem and the central hole of the sealing member. Consequently, the sealing between the valve seat and the lift valve (i.e., the valve core) may not be guaranteed when the valve is closed.

[0008] Therefore, this disclosure was made to solve the above-mentioned problems, and its purpose is to provide a valve device that can ensure the sealing between the valve seat and the valve core when the valve is closed.

[0009] Solution for solving the problem

[0010] To address the aforementioned problems, this disclosure provides a valve device comprising: a valve seat; a valve core; and a valve shaft, the valve core being disposed on the valve shaft. The valve device is characterized in that the valve seat includes: a valve bore; and a valve bore edge, which protrudes from the edge of the valve bore toward the central axis of the valve bore. The valve core, by moving the valve shaft in the direction of the central axis of the valve shaft, abuts against and separates from the valve bore edge to open and close the valve bore. The valve core includes: a sealing member having a sealing surface for the top end of the valve bore edge to abut against when the valve bore is closed; and a protrusion extending from the side of the valve shaft toward the sealing surface. The valve orifice is formed radially, and the end face of the protruding side of the protrusion is formed into a conical convex surface with the outer diameter of the valve core increasing as it approaches the sealing surface. The valve orifice side face at the top end of the valve orifice edge is formed into a conical valve orifice edge conical surface with the inner diameter of the valve orifice increasing as it approaches the top end. The inclination angle of the protruding conical surface relative to the sealing surface is larger than the inclination angle of the valve orifice edge conical surface relative to the sealing surface. Furthermore, the convex corner where the outer diameter of the valve core is smallest in the convex conical surface is located radially inside the valve orifice, which is closer to the smallest diameter of the valve orifice in the valve orifice edge conical surface than the smallest diameter of the valve orifice in the valve orifice edge conical surface.

[0011] According to this method, when the valve device performs the valve closing action, even if the valve shaft is tilted and the valve core's position shifts significantly, the convex part of the valve core is pressed by the valve orifice edge of the valve seat, causing the valve core to move and its position to be adjusted. This allows the top of the valve orifice edge to abut against the sealing surface of the sealing member, bringing the valve device into a closed state. Therefore, when the valve is closed (when the valve device is in the closed state), the top of the valve orifice edge of the valve seat abuts against the sealing surface of the valve core's sealing member, ensuring a tight seal between the valve seat and the valve core. Thus, when the valve is closed, leakage of cooling water between the valve seat and the valve core is suppressed. Furthermore, when the valve device performs the valve closing action, the top of the valve orifice edge sits down instead of abutting against the convex part of the valve core, preventing wear and bending of the top of the valve orifice edge, which is crucial for sealing (closing) the valve seat and valve core, thus ensuring a tight seal between the valve seat and the valve core.

[0012] In the above technical solution, preferably, the valve hole edge has a contact surface formed between the valve hole edge conical 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 conical surface relative to the sealing surface.

[0013] According to this technical solution, the contact area between the convex conical surface and the valve orifice edge can be increased, thus reducing surface pressure. Furthermore, due to the suspension effect generated by fluid flow between the contact surfaces of the convex conical surface and the valve orifice edge, the contact surfaces become essentially non-contact. Therefore, friction generated between the contact surfaces of the convex conical surface and the valve orifice edge can be reduced.

[0014] In the above technical solution, it is preferred that the top end of the valve hole edge is formed into a convex shape.

[0015] According to this technical solution, when the valve is closed, the contact area between the valve orifice edge and the sealing surface of the sealing member can be reduced, thereby increasing the surface pressure. Therefore, the sealing performance between the valve seat and the valve core is improved when the valve is closed.

[0016] In the above technical solution, preferably, the valve device is a device installed in the flow path of the cooling water of the electric vehicle.

[0017] This technical solution ensures a tight seal between the valve seat and valve core when the valve is closed, reducing fluid leakage and enabling high-precision control of the cooling water flow. Therefore, it allows for the required cooling water flow for electric vehicles. Consequently, it improves the energy efficiency of electric vehicles and contributes to carbon neutrality.

[0018] The effects of the invention

[0019] According to the valve device disclosed herein, a seal between the valve seat and the valve core can be ensured when the valve is closed. Attached Figure Description

[0020] Figure 1 This is a diagram showing the valve device of this embodiment (first open valve state, second valve seat and second valve core closed valve state).

[0021] Figure 2 This is a diagram showing the valve device (second open valve state, first valve seat and first valve core closed valve state) of this embodiment.

[0022] Figure 3 It is in the first embodiment Figure 2 A magnified view of region α.

[0023] Figure 4 It is in the first embodiment Figure 3 A magnified view of region β.

[0024] Figure 5 This is a diagram showing the situation in the first embodiment where the valve shaft is tilted and the amplitude of the first valve core increases.

[0025] Figure 6 (A) represents the comparative example ( Figure 9A diagram of each size (as shown in the example). Figure 6 (B) is a diagram showing the dimensions of the first embodiment.

[0026] Figure 7 The second embodiment is different from the first embodiment. Figure 4 The corresponding diagram.

[0027] Figure 8 This is a diagram illustrating the floating effect in the second embodiment.

[0028] Figure 9 This is a comparative example showing an increase in the protruding width of the rubber seal to exceed the amplitude of the first valve core. Detailed Implementation

[0029] The valve device 1, which is an embodiment of this disclosure, will be described.

[0030] (Overview of the valve assembly)

[0031] The valve device 1 of this embodiment will be described in general. This valve device 1 is, for example, a device installed in the flow path of the cooling water in an electric vehicle (not shown) to control the flow rate of the cooling water. Furthermore, "electric vehicle" refers to a vehicle that is driven by electricity from a secondary battery, such as an electric car or a hybrid vehicle.

[0032] like Figure 1 and Figure 2 As shown, the valve device 1 has a main body 11 (i.e., housing) with a flow path, a valve seat 12, a valve core 13, a valve shaft 14, and an actuator 15.

[0033] Furthermore, valve seat 12 (i.e., the first valve seat 121 and the second valve seat 122 described later) is an example of a "valve seat" in this disclosure. Additionally, valve core 13 (i.e., the first valve core 131 and the second valve core 132 described later) is an example of a "valve core" in this disclosure. Moreover, valve shaft 14 is an example of a "valve shaft" in this disclosure.

[0034] The main body 11 has an internal flow path 20 that serves as a housing for the valve core 13, an inflow flow path 21, and two outflow flow paths 22. Thus, the valve device 1 is a three-way valve with one inflow flow path 21 and two outflow flow paths 22. Furthermore, the main body 11 is formed of resin.

[0035] The inflow path 21 is a flow path connected to the internal flow path 20, and is a flow path that allows cooling water to flow into the internal flow path 20.

[0036] The outflow path 22 is a flow path through which cooling water flows out from the internal flow path 20. Furthermore, two outflow paths 22 are provided: a first outflow path 221 and a second outflow path 222. The first outflow path 221 is located on the actuator 15 side relative to the internal flow path 20. The second outflow path 222 is located on the side opposite to the actuator 15 relative to the internal flow path 20.

[0037] In this embodiment, a first valve seat 121 and a second valve seat 122 are provided as valve seats 12. The first valve seat 121 is disposed on the side of the first outflow path 221 in the internal flow path 20. The second valve seat 122 is disposed on the side of the second outflow path 222 in the internal flow path 20. Both the first valve seat 121 and the second valve seat 122 are formed in annular shape and have a circular valve hole 16 in the center.

[0038] In addition, in this embodiment, such as Figures 1-3 As shown, the first valve seat 121 includes a valve hole 16 and a valve hole edge 40. The valve hole edge 40 is formed in a circumferential annular shape at the edge of the valve hole 16 and faces towards the central axis of the valve hole 16. Figures 1-3 It forms prominently below.

[0039] In addition, the valve seat 12 is made of resin, but it can also be made of rubber.

[0040] like Figure 1 and Figure 2 As shown, the valve core 13 is disposed on the valve shaft 14, and opens and closes the valve orifice 16 by abutting against and separating from the valve seat 12. In this embodiment, the valve core 13 includes a first valve core 131 and a second valve core 132 disposed at an open interval in the axial direction of the valve shaft 14. Furthermore, the first valve core 131 is disposed on the first valve seat 121 side, and the second valve core 132 is disposed on the second valve seat 122 side.

[0041] like Figure 3 As shown, the first valve core 131 has a rubber seal 60 and a protrusion 70.

[0042] The rubber seal 60 abuts against and separates from the first valve seat 121. Furthermore, the rubber seal 60 has a sealing surface 61 that abuts against the top end 41 of the valve hole edge 40 of the first valve seat 121 when the valve hole 16 on the first valve seat 121 side is closed. Moreover, the rubber seal 60 is an example of the "sealing member" of this disclosure. Additionally, the top end 41 of the valve hole edge 40 may also be formed with a rounded corner shape.

[0043] The protrusion 70 is located on the sealing surface 61, radially outward from the side of the valve shaft 14 toward the valve bore 16. Figure 1 , Figure 2 The left and right sides Figure 3 It forms prominently on the left side.

[0044] In addition, such as Figure 1 and Figure 2 As shown, the rubber seal 80 of the second valve core 132 abuts against and separates from the second valve seat 122.

[0045] In addition, the parts of the valve core 13 other than the rubber seals 60 and 80 are made of resin, but may also be made of metal.

[0046] like Figure 1 and Figure 2 As shown, the valve shaft 14 is disposed inside the main body 11. The valve shaft 14 is located between the actuator 15 and the second valve core 132. Furthermore, the valve shaft 14 is supported by a bearing 17. The valve shaft 14 is made of metal, but it can also be made of resin.

[0047] In this embodiment, a valve core 13 is provided at one end of the valve shaft 14 along its axial direction. The valve shaft 14 is movable in the thrust direction that is the axial direction (i.e., the direction of the central axis) of the valve shaft 14.

[0048] The actuator 15 is a drive unit that moves the valve shaft 14 axially. In this embodiment, the actuator 15 includes a movable core 31, a fixed core 32, a winding tube 33, a coil 34, and a housing 35.

[0049] The movable core 31 moves integrally with the valve shaft 14, thereby moving the valve shaft 14 along its axial direction (central axis direction). The fixed core 32 is disposed opposite to the movable core 31 in the axial direction of the valve shaft 14.

[0050] The movable core 31 and the fixed core 32 are formed of a magnetic material (e.g., metal). The movable core 31 and the fixed core 32 are magnetized by the magnetic field generated around the coil 34 when a current flows through it. 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. 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.

[0051] The winding tube 33 is formed into a cylindrical shape, with a movable core 31 and a fixed core 32 provided on the inner side, and a coil 34 provided on the outer side. Furthermore, the winding tube 33, the coil 34, etc. are covered by resin molding to form a resin outer shell 35.

[0052] The valve device 1 with this structure uses an actuator 15 to move the valve shaft 14 axially, thereby enabling... Figure 1 The first valve opening state shown and Figure 2Switching between the second valve opening state shown.

[0053] Here, "first open valve state" refers to the state where the first valve seat 121 and the first valve core 131 are open, and the second valve seat 122 and the second valve core 132 are closed. Conversely, "second open valve state" refers to the state where the first valve seat 121 and the first valve core 131 are closed, and the second valve seat 122 and the second valve core 132 are open. Furthermore, in the closed valve state, the valve seat 12 and the valve core 13 abut against each other along the entire circumference of the annular valve seat 12, resulting in a fully closed state where the valve seat 12 and the valve core 13 are sealed.

[0054] Furthermore, in Figure 1 In the first open valve state shown, cooling water introduced from the inflow path 21 is discharged from the first outflow path 221. Additionally, in Figure 2 In the second open valve state shown, the cooling water introduced from the inflow path 21 is discharged from the second outflow path 222.

[0055] Thus, in this embodiment, by moving the valve shaft 14 in the direction of its central axis, the first valve core 131 abuts against and separates from the valve hole edge 40 of the first valve seat 121 to open and close the valve hole 16 of the first valve seat 121, and the second valve core 132 abuts against and separates from the second valve seat 122 to open and close the valve hole 16 of the second valve seat 122.

[0056] (Countermeasures against valve core vibration caused by valve shaft tilt)

[0057] Next, countermeasures will be explained for the vibration of the valve core 13 caused by the tilting of the valve shaft 14.

[0058] For example, when abnormal wear occurs in the valve shaft 14 or the bearing 17, the tilt of the valve shaft 14 (i.e., the tilt relative to the central axis) may increase. Moreover, when the tilt of the valve shaft 14 increases in this way, the amplitude of the valve core 13 (i.e., the positional offset) increases.

[0059] In this case, in order to ensure that the top end 41 of the valve hole edge 40 of the first valve seat 121 reliably abuts against the sealing surface 61 of the rubber seal 60 of the first valve core 131 when the first valve seat 121 and the first valve core 131 are closed (i.e., in the second open state), such as Figure 9 As shown, consider increasing the protruding width L1 of the rubber seal to above the amplitude of the first valve core 131.

[0060] However, increasing the protruding width L1 of the rubber seal may cause the rubber seal 60 to curl due to the flow of cooling water. Furthermore, if the outer diameter φD2 of the protrusion 70 is reduced while increasing the protruding width L1, the inner diameter of the rubber seal 60 must be reduced to ensure sufficient clamping of the rubber seal 60 into the first valve core 131. This may increase the assembly load of the rubber seal 60 during assembly with the first valve core 131, leading to a decrease in the assemblability of the rubber seal 60. Moreover, increasing the protruding width L1 may increase the pressure loss of the cooling water due to the enlarged outer diameter φD1 of the rubber seal 60. Thus, increasing the protruding width L1 of the rubber seal may cause various problems.

[0061] Therefore, in this embodiment, a countermeasure is taken against the vibration of the valve core 13 caused by the tilting of the valve shaft 14 through the following example.

[0062] <First Embodiment>

[0063] First, in the first embodiment, as Figure 4 As shown, when tilt angles θ1, θ2, and θ3 are specified, the relationship shown in the following formula holds. Furthermore, Figures 1-4 This indicates that the valve shaft 14 is not tilted and no positional offset of the first valve core 131 is generated.

[0064] [Formula 1]

[0065] θ2>θ1>θ3

[0066] Here, as Figure 4 As shown, the tilt angle θ1 is the tilt angle of the convex conical surface 71 of the first valve core 131 relative to the sealing surface 61 of the rubber seal 60. Furthermore, the convex conical surface 71 is the protruding side of the convex portion 70 (…). Figure 4 The left end face is formed into a cone shape such that the outer diameter of the first valve core 131 increases as it approaches the sealing surface 61.

[0067] In addition, such as Figure 4 As shown, the tilt angle θ2 is the tilt angle of the conical surface 43 of the first valve seat 121 relative to the seat surface 50. Furthermore, the seat surface 50 is the end face of the valve core 13 side in the direction of the central axis of the annular first valve seat 121. Additionally, the conical surface 43 is the surface located between the conical surface 42 at the valve hole edge and the inner wall surface 90 of the valve hole 16 on the first valve seat 121 side.

[0068] Moreover, such as Figure 4As shown, when no positional offset occurs in the first valve core 131, the tilt angle θ3 is the tilt angle of the valve bore edge conical surface 42 relative to the sealing surface 61 of the rubber seal 60 of the first valve core 131. Furthermore, the valve bore edge conical surface 42 is the surface on the valve bore 16 side at the top end of the valve bore edge 40 (i.e., the top end 41 and its periphery), and is formed into a conical shape in which the inner diameter of the valve bore 16 increases as it approaches the top end 41.

[0069] Additionally, in this embodiment, as Figure 4 As shown, the convex corner 72 is located radially inside the valve hole 16, compared to the smallest diameter portion 44 of the valve hole edge tapered surface. Figure 4 (The position on the right side).

[0070] Here, the convex corner portion 72 is the part where the outer diameter of the first valve core 131 in the convex conical surface 71 is the smallest. Additionally, the valve hole edge conical surface minimum diameter portion 44 is the part where the inner diameter of the valve hole 16 in the valve hole edge conical surface 42 is the smallest. Furthermore, the valve hole edge conical surface minimum diameter portion 44 can also be formed with a rounded corner shape.

[0071] Thus, in this embodiment, in Figure 4 In the cross section shown (i.e., the cross section in the direction of the central axis of the first valve seat 121 and the first valve core 131), the tilt angle θ1 is greater than the tilt angle θ3, and the convex corner 72 is located on the radial inner side of the valve hole 16, which is closer to the valve hole 16 than the minimum diameter of the valve hole edge tapered surface 44.

[0072] Therefore, even if the tilt of the valve shaft 14 increases and the amplitude of the valve core 13 increases, the top end 41 of the valve hole edge 40 of the first valve seat 121 can still abut against the sealing surface 61 of the rubber seal 60 of the first valve core 131.

[0073] That is, when valve device 1 performs the valve closing action, such as Figure 5 As shown, even when the tilt of the valve shaft 14 increases and the amplitude of the first valve core 131 increases (in Figure 5 In the case where the first valve core 131 is significantly offset to the left of the attached figure, the protrusion 70 of the first valve core 131 is also pressed by the valve hole edge 40 of the first valve seat 121, thereby causing the first valve core 131 to... Figure 5 Move it to the right to adjust the position of the first valve core 131.

[0074] Furthermore, this ensures that the top tip 41 of the valve hole edge 40 does not abut against the protrusion 70, but rather... Figure 3 , Figure 4As shown, the valve assembly 1 is closed when it abuts against the sealing surface 61. Therefore, when the first valve seat 121 and the first valve core 131 are closed, the top tip 41 of the valve hole edge 40 of the first valve seat 121 will not abut against the protrusion 70 and wear down, but will abut against the sealing surface 61 of the rubber seal 60 of the first valve core 131, thus ensuring a tight seal between the first valve seat 121 and the first valve core 131. Therefore, when the first valve seat 121 and the first valve core 131 are closed, leakage of cooling water between the first valve seat 121 and the first valve core 131 can be suppressed.

[0075] In addition, in this embodiment, the tilt angle θ2 is larger than the tilt angles θ1 and θ3.

[0076] Therefore, when the protrusion 70 of the first valve core 131 is pressed by the valve hole edge 40 of the first valve seat 121 and the first valve core 131 moves, the conical surface 71 of the protrusion of the first valve core 131 is pressed by the minimum diameter portion 44 of the conical surface of the valve hole edge of the first valve seat 121, thus the position of the first valve core 131 can be adjusted more effectively.

[0077] In addition, in this embodiment, the valve hole edge portion 40 is provided with a protruding ring including the valve hole edge tapered surface 42. That is, in the cross section of the first valve seat 121 in the direction of its central axis, the top end portion (i.e., the top end 41 and its peripheral portion) of the valve hole edge portion 40 is formed into a convex shape.

[0078] Therefore, when the first valve seat 121 and the first valve core 131 are closed, the contact area between the valve hole edge 40 and the sealing surface 61 can be reduced, thereby increasing the surface pressure. Thus, the sealing between the first valve seat 121 and the first valve core 131 can be ensured more effectively when the valve is closed.

[0079] In addition, such as Figure 6 As shown in (A), in the comparative example (refer to) Figure 9 In order to cope with the vibration of the first valve core 131 in a way that prevents the valve hole edge 40 of the first valve seat 121 from abutting against the protrusion 70 of the first valve core 131, the protrusion width L1 of the rubber seal becomes larger. In contrast, as... Figure 6 As shown in (B), in this embodiment, the vibration of the first valve core 131 is addressed in a manner that does not prevent the valve hole edge 40 of the first valve seat 121 from abutting against the protrusion 70 of the first valve core 131, thereby reducing the protrusion width L1 of the rubber seal.

[0080] Therefore, and thus, with Figure 6 Compared to the comparative example shown in (A), in Figure 6 In the embodiment shown in (B), the outer diameter φD1 of the rubber seal 60 of the first valve core 131 can be reduced. Additionally, with... Figure 6Compared to the comparative example shown in (A), in Figure 6 In the embodiment shown in (B), the outer diameter φD2 of the protrusion 70 of the first valve core 131 can be increased. Additionally, with... Figure 6 Compared to the comparative example shown in (A), in Figure 6 In the embodiment shown in (B), the inner diameter φD3 of the rubber seal 60 of the first valve core 131 can be enlarged.

[0081] Moreover, such a valve device 1 is installed in the cooling water flow path of the electric vehicle.

[0082] Therefore, when the first valve seat 121 and the first valve core 131 are closed, the sealing between the first valve seat 121 and the first valve core 131 can be ensured, thereby reducing cooling water leakage and enabling high-precision control of the cooling water flow rate. This allows for the flow of cooling water at the required rate for electric vehicles. Consequently, the energy efficiency of electric vehicles can be improved, contributing to carbon neutrality.

[0083] <Second Embodiment>

[0084] Next, the second embodiment will be described, but the differences from the first embodiment will be explained, while the points common to the first embodiment will be omitted.

[0085] In this embodiment, as Figure 7 As shown, the valve orifice edge 40 has a contact surface 45. This contact surface 45 is disposed between the conical surface 42 of the valve orifice edge and the inner wall surface 90 (specifically, the conical surface 43) of the valve orifice 16 on the side of the first valve seat 121. Furthermore, the inner wall surface 90 of the valve orifice 16 refers to the inner side of the first valve seat 121 located in the direction of the valve orifice edge 40 towards the central axis of the valve orifice 16. Figure 7 The inner wall surface at the position of the upper side.

[0086] Moreover, in Figure 7 In the cross-section shown (i.e., the cross-section along the central axis of the first valve seat 121 and the first valve core 131), the tilt angle θ4 is equal to or approximately equal to the tilt angle θ1. Furthermore, as... Figure 7 As shown, when there is no positional shift of the first valve core 131, the tilt angle θ4 is the tilt angle of the contact surface 45 relative to the sealing surface 61 of the rubber seal 60 of the first valve core 131.

[0087] Therefore, at the contact portion between the convex conical surface 71 and the contact surface 45 of the valve hole edge 40, the contact area can be increased, thus reducing surface pressure. Furthermore, as... Figure 8 As shown, due to the suspension effect generated when cooling water flows between the convex conical surface 71 and the valve hole edge 40 as indicated by the arrow in the figure, the contact surface 45 between the convex conical surface 71 and the valve hole edge 40 becomes approximately non-contact.

[0088] Therefore, when the valve device 1 performs the valve closing action, the contact surface 45 between the convex conical surface 71 and the valve hole edge 40 is maintained in a state of approximately non-contact, so that the top tip 41 of the valve hole edge 40 of the first valve seat 121 abuts against the sealing surface 61 of the rubber seal 60 of the first valve core 131. Thus, the friction generated between the convex conical surface 71 and the contact surface 45 of the valve hole edge 40 can be reduced.

[0089] Furthermore, the above-described embodiments are merely illustrative and do not limit this disclosure in any way. Of course, various modifications and variations can be made without departing from its spirit.

[0090] For example, the above description describes a method for ensuring a seal between the first valve seat 121 and the first valve core 131, but this method can also be applied to ensure a seal between the second valve seat 122 and the second valve core 132.

[0091] That is, the second valve seat 122 may have a valve hole edge portion, and the second valve core 132 may abut against and separate from the valve hole edge portion of the second valve seat 122 to open and close the valve hole 16 of the second valve seat 122.

[0092] Furthermore, the angle of inclination of the convex conical surface of the second valve core 132 relative to the sealing surface of the rubber seal 80 of the second valve core 132 may be greater than the angle of inclination of the valve hole edge conical surface of the second valve seat 122 relative to the sealing surface of the rubber seal 80. In addition, the convex corner of the second valve core 132 may be located radially inside the valve hole 16, which is closer to the minimum diameter of the valve hole edge conical surface of the second valve seat 122.

[0093] Furthermore, in the above description, an example of cooling water flowing in the internal flow path 20, the inflow flow path 21, and the outflow flow path 22 is shown, but the flow of fluids other than cooling water, such as liquids and gases, is also considered.

[0094] Explanation of reference numerals in the attached figures

[0095] 1. Valve assembly; 11. Main body; 12. Valve seat; 121. First valve seat; 122. Second valve seat; 13. Valve core; 131. First valve core; 132. Second valve core; 14. Valve shaft; 15. Actuator; 16. Valve orifice; 20. Internal flow path; 21. Inflow path; 22. Outflow path; 221. First outflow path; 222. Second outflow path; 40. Valve orifice edge; 41. Top end; 42. Valve orifice edge conical surface; 44. Valve orifice edge conical surface minimum diameter; 45. Contact surface; 60. Rubber seal; 61. Sealing surface; 70. Protrusion; 71. Protrusion conical surface; 72. Protrusion corner; 90. Inner wall surface; θ1. Inclination angle (of the protrusion conical surface relative to the sealing surface); θ3. Inclination angle (of the valve orifice edge conical surface relative to the sealing surface); θ4. Inclination angle (of the contact surface relative to the sealing surface).

Claims

1. A valve device comprising: Valve seat; Valve core; and The valve shaft, on which the valve core is disposed, The valve device is characterized by, The valve seat includes: a valve hole; and a valve hole edge, which is formed protruding from the edge of the valve hole toward the central axis of the valve hole. The valve core moves along the central axis of the valve shaft, thereby opening and closing the valve orifice by abutting and separating from the valve orifice edge. The valve core includes: a sealing member having a sealing surface that abuts the top end of the valve orifice edge when the valve orifice is closed; and a protrusion that is formed on the sealing surface radially from the side of the valve shaft toward the valve orifice. The end face of the protruding side of the protrusion is formed into a conical surface with a tapered shape, where the outer diameter of the valve core increases as it approaches the sealing surface. The valve hole side surface at the top end of the valve hole edge is formed into a conical valve hole edge surface, which is tapered in shape and the inner diameter of the valve hole increases as it approaches the top end. The inclination angle of the convex conical surface relative to the sealing surface is greater than the inclination angle of the valve orifice edge conical surface relative to the sealing surface. Furthermore, the convex corner portion where the outer diameter of the valve core in the convex conical surface is the smallest is located on the radially inner side of the valve hole, which is closer to the valve hole than the valve hole edge conical surface where the inner diameter of the valve hole is the smallest.

2. The valve device according to claim 1, characterized in that, The valve orifice edge has a contact surface formed between the conical surface of the valve orifice edge and the inner wall surface of the valve orifice. 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 conical surface relative to the sealing surface.

3. The valve device according to claim 1 or 2, characterized in that, The top end of the valve orifice edge is formed into a convex shape.

4. The valve device according to claim 1 or 2, characterized in that, The valve device is a device installed in the cooling water flow path of an electric vehicle.

Images