Flow control valve

Abstract

In a flow control valve, the valve seat includes: an annular valve seat base; and an annular valve seat sealing portion disposed on the inner circumferential side relative to the valve seat base. The valve body includes: a valve body abutment surface for abutting the axially inclined end of the valve seat base; and a valve body press-in surface for pressing the outer circumferential surface of the valve seat base. The valve seat sealing portion includes: a seat surface formed axially in the valve seat sealing portion at the end opposite to the valve body abutment surface side, which, when the flow control valve is in the closed state, abuts against the valve core to seal between the valve seat and the valve core; and a valve seat-valve body sealing portion formed axially in the valve seat sealing portion at the end on the valve body abutment surface side, protruding from the valve seat base toward the valve body abutment surface side, which abuts against the valve body abutment surface to seal between the valve seat and the valve body.

Description

Technical Field

[0001] This disclosure relates to a flow control valve for regulating the flow rate of a fluid. Background Technology

[0002] Patent Document 1 discloses a flow control valve (sealing valve) for opening and closing a gas flow path, which includes the following: In this flow control valve, a sealing part (sealing member) is provided on the valve seat to seal between it and the valve core.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-029129 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In the flow control valve disclosed in Patent Document 1, the valve seat and valve core are housed within the valve body (housing), and the valve seat is positioned on a stepped portion of the pipe section, which is part of the valve body. However, no method is described for sealing the valve seat and the valve body (specifically, the stepped portion). Therefore, it is considered to provide an additional component for sealing the valve seat and the valve body, but this would increase the number of components and potentially lead to a larger flow control valve.

[0008] Therefore, this disclosure was made to solve the above-mentioned problems, and its purpose is to provide a flow control valve that can be miniaturized.

[0009] Solution for solving the problem

[0010] To address the aforementioned problems, this disclosure provides a flow control valve comprising: an annular valve seat; a valve core that abuts against and separates from the valve seat; and a valve body housing the valve seat and the valve core. The valve seat is characterized by comprising: an annular valve seat base; and an annular valve seat sealing portion disposed on the inner circumferential side relative to the valve seat base. The valve body comprises: a valve body abutting surface for abutting the axially inclined end of the valve seat base; and a valve body pressing surface for pressing the outer circumferential surface of the valve seat base. The valve seat sealing portion includes: a seat surface, which is formed axially at an end opposite to the valve body abutment surface side of the valve seat sealing portion, wherein when the flow control valve is in the closed state, the seat surface abuts against the valve core to seal between the valve seat and the valve core; and a valve seat-valve body sealing portion, which is formed axially at an end on the valve body abutment surface side of the valve seat sealing portion such that it protrudes beyond the valve seat base towards the valve body abutment surface side, wherein the valve seat-valve body sealing portion abuts against the valve body abutment surface to seal between the valve seat and the valve body.

[0011] According to this technical solution, a single valve seat seal can be used to seal both the valve seat and valve core, as well as the valve seat and valve body. Therefore, the flow control valve can be miniaturized by reducing the number of components.

[0012] In the above technical solution, preferably, the valve seat base has the following features at the end of the valve seat base on the valve body abutment surface side in the axial direction: an abutment surface side end face; and a base protrusion, which is formed in such a way that it protrudes further from the abutment surface side end face toward the valve body abutment surface side.

[0013] According to this technical solution, when the valve seat is pressed into the valve body, the valve seat can be stopped from moving further by abutting the front end face of the base protrusion against the valve body abutting surface. Therefore, the base protrusion can function as a stop when the valve seat is pressed into the valve body.

[0014] In the above technical solution, preferably, the valve seat-valve body sealing portion is formed such that, when not in contact with the valve body contact surface, it protrudes further towards the valve body contact surface than the base protrusion.

[0015] According to this technical solution, when the valve seat is pressed into the valve body and the front end face of the base protrusion abuts against the abutment surface, the sealing portion between the valve seat and the valve body can be compressed while simultaneously abutting against the abutment surface. Therefore, the base protrusion can function as a stop when the valve seat is pressed into the valve body, and the sealing portion between the valve seat and the valve body can be used more reliably to seal the valve seat and the valve body.

[0016] In the above technical solution, preferably, the valve seat base has multiple inclined portions at the end of the outer peripheral surface of the valve seat base that is close to the valve body abutment surface. The multiple inclined portions are formed to be inclined in multiple segments from the outer peripheral surface of the valve seat base toward the inner peripheral side of the valve seat base.

[0017] According to this technical solution, when the valve seat is pressed into the valve body, the multiple inclined sections of the valve seat base can avoid the corner where the abutment surface and the pressing surface of the valve body intersect. Therefore, the valve seat base is less likely to interfere with the corner where the abutment surface and the pressing surface of the valve body intersect.

[0018] In the above technical solution, preferably, the valve body has the following features at the upstream side of the valve body pressing surface in the pressing direction relative to the valve seat: a stepped portion formed as a surface opposite to the outer peripheral surface of the valve seat base, and formed at a position radially outward from the valve body pressing surface in the valve seat base; and an inclined portion formed as inclined from the stepped portion toward the valve body pressing surface.

[0019] According to this technical solution, the valve seat can be easily pressed into the valve body.

[0020] In the above technical solution, preferably, the flow control valve is used in a fuel cell system, and the valve seat is pressed into the valve body toward the side where the fuel cell is located.

[0021] According to this technical solution, even when the fuel cell side becomes negative pressure, the valve seat is not easily detached from the valve body because it is pulled in the direction of being pressed into the valve body.

[0022] The effects of the invention

[0023] The flow control valve disclosed herein can be miniaturized. Attached Figure Description

[0024] Figure 1 This is a schematic structural diagram of a fuel cell system using the flow control valve of this embodiment.

[0025] Figure 2 This is a perspective view of the flow control valve in this embodiment.

[0026] Figure 3 It is a three-dimensional view showing a portion of the valve in the closed state (fully closed state).

[0027] Figure 4 It is a three-dimensional view showing a portion of the valve in the open (fully open) state.

[0028] Figure 5 This is a side view showing the valve seat, valve core, and rotating shaft in the closed state.

[0029] Figure 6 yes Figure 5 A-A sectional view.

[0030] Figure 7 This is a cross-sectional view of the valve seat and its surrounding area in this embodiment (a cross-sectional view taken along the axial direction of the valve seat).

[0031] Figure 8 yes Figure 7 A magnified view of region α.

[0032] Figure 9 This is a cross-sectional view of the valve seat and its surroundings in this embodiment (a cross-sectional view cut along the axial direction of the valve seat), and it is a diagram showing the state before the valve seat is pressed into the housing. Detailed Implementation

[0033] Hereinafter, embodiments of the flow control valve of this disclosure will be described. Furthermore, before describing the flow control valve 1 of this embodiment, a fuel cell system 101 using the flow control valve 1 will first be described.

[0034] <Description of the fuel cell system>

[0035] like Figure 1 As shown, the fuel cell system 101 includes a fuel cell stack (fuel cell, FC stack) 111, a hydrogen system component 112, and an air system component 113.

[0036] The fuel cell stack 111 generates electricity by receiving a supply of fuel gas and an oxidant gas. In this embodiment, the fuel gas is hydrogen and the oxidant gas is air. That is, the fuel cell stack 111 generates electricity by receiving a supply of hydrogen from the hydrogen system component 112 and a supply of air from the air system component 113. The electricity generated by the fuel cell stack 111 is then supplied to a drive motor (not shown) via an inverter (not shown).

[0037] A hydrogen system component 112 is provided on the anode side of the fuel cell stack 111. This hydrogen system component 112 includes a hydrogen supply passage 121 and a hydrogen discharge passage 122. The hydrogen supply passage 121 is a passage for supplying hydrogen from a hydrogen storage tank (not shown) to the fuel cell stack 111. The hydrogen discharge passage 122 is a passage for discharging hydrogen gas discharged from the fuel cell stack 111 (hereinafter appropriately referred to as "hydrogen exhaust gas").

[0038] An air system component 113 is provided on the cathode side of the fuel cell stack 111. This air system component 113 includes an air supply passage 131, an air exhaust passage 132, and a bypass passage 133. The air supply passage 131 is a flow path for supplying air to the fuel cell stack 111 from outside the fuel cell system 101. The air exhaust passage 132 is a flow path for discharging air discharged from the fuel cell stack 111 (hereinafter appropriately referred to as "exhaust air"). The bypass passage 133 is a passage for allowing air to flow from the air supply passage 131 to the air exhaust passage 132 without passing through the fuel cell stack 111.

[0039] The air system component 113 includes an inlet shut-off valve 141 in the air supply passage 131. The inlet shut-off valve 141 is a valve that opens and closes the air supply passage 131, and also switches the supply and disconnection of air to the fuel cell stack 111. In this embodiment, the flow control valve 1, described later, is used as the inlet shut-off valve 141.

[0040] Furthermore, the air system component 113 includes an outlet shut-off valve 142 in the air exhaust passage 132. The outlet shut-off valve 142 is a valve that opens and closes the air exhaust passage 132, and also switches between the discharge and disconnection of exhaust gas from the fuel cell stack 111. Moreover, in this embodiment, the flow control valve 1 described later is used as the outlet shut-off valve 142.

[0041] Furthermore, the air system component 113 includes a bypass valve 143 in the bypass passage 13. The bypass valve 143 is a valve that controls the airflow in the bypass passage 133. Alternatively, the flow control valve 1 described later can also be used as the bypass valve 143.

[0042] In the fuel cell system 101 with the above-described structure, hydrogen supplied to the fuel cell stack 111 from the hydrogen supply passage 121 is used by the fuel cell stack 111 to generate electricity. Afterwards, the hydrogen is discharged from the fuel cell stack 111 as hydrogen exhaust gas to the outside of the fuel cell system 101 via the hydrogen exhaust passage 122. Conversely, air supplied to the fuel cell stack 111 from the air supply passage 131 is used by the fuel cell stack 111 to generate electricity, and afterwards, the air is discharged from the fuel cell stack 111 as air exhaust gas to the outside of the fuel cell system 101 via the air exhaust passage 132.

[0043] <Instructions for Flow Control Valves>

[0044] Next, the flow control valve 1, which is used as the inlet shut-off valve 141, outlet shut-off valve 142, and bypass valve 143 of the fuel cell stack 111, will be described.

[0045] (Overall overview of flow control valves)

[0046] First, let's describe the general overview of flow control valve 1. For example... Figure 2 As shown, the flow control valve 1 includes a valve section 2 consisting of a double eccentric valve, a motor section 3 with a built-in motor, and a reduction gear section 4 with multiple gears. The valve section 2 includes a metal tube 12 with a flow path 11 for fluid flow. A valve seat 13, a valve core 14, and a rotating shaft 15 are arranged within the flow path 11. The internal shape of the flow path 11, the external shape of the valve seat 13, and the external shape of the valve core 14 are circular or approximately circular when viewed from above. The rotational force of the motor is transmitted to the rotating shaft 15 via the multiple gears. In this embodiment, the tube 12 with the flow path 11 corresponds to a portion of the housing 6, and the motor of the motor section 3 and the multiple gears of the reduction gear section 4 are covered by the housing 6. The housing 6 is a valve body that houses the valve seat 13, valve core 14, etc., and is formed of a metal such as aluminum.

[0047] like Figure 3 and Figure 4As shown, a stepped portion 10 is formed in a portion of the tube 12 of the housing 6, and a valve seat 13 is assembled on the stepped portion 10 of the housing 6. In this embodiment, the valve seat 13 is pressed (fixed) into the stepped portion 10 of the housing 6. The valve seat 13 is annular and has a circular or substantially circular valve hole 16 in the center. An annular seat surface 17 is formed at the edge of the valve hole 16. In this embodiment, a rubber sealing portion 22 (an example of the "sealing portion" of this disclosure) for sealing between the valve seat 13 and the valve core 14 is provided on the valve seat 13, and the seat surface 17 is formed on the rubber sealing portion 22. Furthermore, the details of the valve seat 13 will be described later.

[0048] The valve core 14 is in the shape of a circular plate, and an annular sealing surface 18 corresponding to the seat surface 17 is formed on its outer periphery. The valve core 14 is fixed to the rotating shaft 15 and rotates integrally with the rotating shaft 15, while abutting and separating relative to the valve seat 13.

[0049] like Figure 6 As shown, the axis L1 of the rotating shaft 15 extends radially parallel to the valve core 14 and the valve hole 16, and is radially eccentrically arranged from the center P1 of the valve hole 16 to the valve hole 16. Furthermore, the sealing surface 18 of the valve core 14 is eccentrically arranged in the direction extending from the axis L1 of the rotating shaft 15 to the axis L2 of the valve core 14.

[0050] like Figure 5 and Figure 6 As shown, the valve core 14 includes a mountain-shaped fixing portion 14b, which protrudes from the upper plate surface 14a of the valve core 14 and is fixed to the rotating shaft 15. This fixing portion 14b is fixed to the rotating shaft 15 by means of a pin 15a protruding from the front end of the rotating shaft 15 at a position radially offset from the axis L1 of the rotating shaft 15. Additionally, as... Figure 6 As shown, the fixing part 14b is disposed on the axis L2 of the valve core 14, and the valve core 14 including the fixing part 14b is formed in a left-right symmetrical shape with the axis L2 of the valve core 14 as the center.

[0051] This flow control valve 1 with such a structure causes the valve core 14 to rotate around the axis L1 of the rotating shaft 15, thereby achieving a closed valve state (fully closed state, refer to the reference) where the sealing surface 18 of the valve core 14 abuts against the seat surface 17 of the valve seat 13. Figure 3 The valve is in an open state where the sealing surface 18 of the valve core 14 is separated from the seat surface 17 of the valve seat 13. Furthermore, Figure 4 The diagram shows the fully open state, in which the sealing surface 18 of the valve core 14 is maximally separated from the seat surface 17 of the valve seat 13.

[0052] (Regarding the valve seat and its surroundings)

[0053] Next, the structure and function of valve seat 13 and its surrounding area will be explained.

[0054] like Figure 7 and Figure 8 As shown, the valve seat 13 is pressed into the housing 6 (specifically, into the stepped portion 10 formed in the tube portion 12, which is a part of the housing 6). In this embodiment, in Figure 7 , Figure 8 In the middle, a fuel cell stack 111 is provided on the lower side of the valve seat 13, such as Figure 9 As shown, the valve seat 13 is pressed into the housing 6 towards the side where the fuel cell stack 111 is located. Furthermore, in Figure 7 and Figure 9 For ease of explanation, the valve core 14 and the rotating shaft 15 are omitted from the diagram.

[0055] The valve seat 13 includes a valve seat base 21 and a rubber sealing portion 22 disposed on its inner circumference relative to the valve seat base 21. Both the valve seat base 21 and the rubber sealing portion 22 are annular (more specifically, circular or substantially circular). Furthermore, the rubber sealing portion 22 is an example of the "valve seat sealing portion" of this disclosure. Additionally, the valve seat base 21 is made of a metal such as stainless steel, and the rubber sealing portion 22 is made of rubber.

[0056] The housing 6 has an abutment surface 31 and a press-in surface 32 at its stepped portion 10. The abutment surface 31 is for the valve seat base 21 to be axially ( Figure 7 , Figure 8 The end of the valve seat base 21 (in the vertical direction) abuts against the valve seat. Additionally, the press-in surface 32 is the surface into which the outer peripheral surface 41 of the valve seat base 21 is pressed. Furthermore, the abutting surface 31 is an example of the "valve body abutting surface" of this disclosure, and the press-in surface 32 is an example of the "valve body press-in surface" of this disclosure.

[0057] Furthermore, the pressing surface 32 is completely covered by the valve seat 13 and is not exposed. Therefore, it is possible to prevent burrs and other debris generated when the valve seat 13 is pressed into the housing 6 from falling off (or being discharged) from the pressed portion between the outer peripheral surface 41 of the valve seat base 21 and the pressing surface 32.

[0058] Furthermore, in this embodiment, in addition to the seat surface 17, the rubber sealing part 22 is also provided with a valve seat housing sealing part 51 (hereinafter simply referred to as "sealing part 51"). Moreover, the sealing part 51 is an example of the "valve seat valve body sealing part" of this disclosure.

[0059] Specifically, the seat surface 17 is axially located in the rubber sealing part 22 ( Figure 7 , Figure 8 The end is formed on the side opposite to the contact surface 31 (upper side) in the vertical direction. Therefore, when the flow control valve 1 is in the closed state (refer to...). Figure 3The seat 17 abuts against the sealing surface 18 of the valve core 14, thereby sealing the valve seat 13 and the valve core 14.

[0060] Furthermore, the sealing portion 51 is formed on the lower end of the abutment surface 31 side, protruding from the abutment surface side end face 42 of the valve seat base 21 (described later) in the axial direction of the rubber sealing portion 22. Thus, the sealing portion 51 abuts against the abutment surface 31, sealing the valve seat 13 and the housing 6 (specifically, the rubber sealing portion 22 and the abutment surface 31). Furthermore, as... Figure 8 dotted lines Figure 9 As shown, the sealing portion 51 is formed such that, in the state where it does not abut against the contact surface 31 (i.e., before the valve seat 13 is pressed into the stepped portion 10 of the housing 6), it protrudes towards the contact surface 31 from the base protrusion 43 of the valve seat base 21, which will be described later.

[0061] In addition, such as Figure 7 , Figure 8 As shown, the valve seat base 21 has an abutment surface side end face 42 and a base protrusion 43 at its axial end face near the abutment surface 31. The abutment surface side end face 42 is the axial end face of the valve seat base 21 near the abutment surface 31. The base protrusion 43 is formed such that it protrudes further from the abutment surface side end face 42 toward the abutment surface 31. Thus, the front end face 43a of the base protrusion 43 abuts against the abutment surface 31.

[0062] Furthermore, the valve seat base 21 has two inclined portions 44 at its end on the abutment surface 31 side of its outer peripheral surface 41. These two inclined portions 44 are formed from the outer peripheral surface 41 side toward the inner peripheral side of the valve seat base 21. Figure 8 The right side of the valve seat base 21 is inclined in two segments. Alternatively, the two inclined segments 44 can be replaced by an inclined segment with three or more segments. That is, as long as the valve seat base 21 has a multi-segment inclined segment formed in multiple segments (i.e., two or more segments) that is inclined from the outer peripheral surface 41 toward the inner peripheral surface of the valve seat base 21.

[0063] In addition, such as Figure 8 As shown, the stepped portion 10 of the housing 6 is located upstream of the press-in surface 32 in the press-in direction of the valve seat 13. Figure 8 The valve seat 13 is provided with a pressing guide 33 at the upper side of the valve seat 13. When the valve seat 13 is pressed into the step portion 10, the pressing guide 33 guides the valve seat 13.

[0064] Furthermore, the press-in guide 33 includes a stepped portion 61 and an inclined portion 62. The stepped portion 61 is formed as a surface opposite to the outer peripheral surface 41 of the valve seat base 21, and is formed on the radially outer side of the valve seat base 21 compared to the press-in surface 32. Figure 8(on the left side). In addition, the inclined portion 62 is formed to be inclined from the stepped portion 61 toward the pressing surface 32.

[0065] In addition, the pressing length of the outer peripheral surface 41 of the valve seat base 21 (between the pressing surface 32) is set to a length that can ensure the pressing holding load is above the rebound force of the sealing part 51 that seals the valve seat 13 and the housing 6.

[0066] Furthermore, the gap between the push-in guide 33 and the outer peripheral surface 41 of the valve seat base 21 is set such that foreign objects from the outside will not be trapped, and foreign objects larger than the gap will not remain in the gap. Therefore, the flow control valve 1 is easy to clean.

[0067] <Effects of this implementation method>

[0068] As described above, according to this embodiment, the rubber sealing portion 22 of the valve seat 13 is provided with a seat surface 17 and a sealing portion 51.

[0069] Thus, the rubber sealing part 22 is provided with a seat surface 17 that abuts against the valve core 14 to seal the valve seat 13 and the valve core 14 when the flow control valve 1 is in the closed state, and a sealing part 51 that abuts against the abutment surface 31 to seal the valve seat 13 and the housing 6. Therefore, a single rubber sealing part 22 can seal both the valve seat 13 and the valve core 14, and the valve seat 13 and the housing 6. Thus, the flow control valve 1 can be miniaturized by reducing the number of components.

[0070] In addition, the valve seat base 21 of the valve seat 13 has a base protrusion 43.

[0071] Thus, a base protrusion 43 is provided at the end of the valve seat base 21 on the side near the abutment surface 31. Therefore, when the valve seat 13 is pressed into the stepped portion 10, by abutting the abutment surface 31 with the front end face 43a of the base protrusion 43, the valve seat 13 can be stopped from moving further. Therefore, the base protrusion 43 functions as a stop when the valve seat 13 is pressed into the stepped portion 10.

[0072] Furthermore, by providing the base protrusion 43 on the side of the outer peripheral surface 41 of the valve seat base 21, the pressing length on the outer peripheral surface 41 of the valve seat base 21 can be extended by an amount corresponding to the two inclined sections 44 that can be provided in the base protrusion 43. Therefore, the required pressing length can be easily ensured.

[0073] Furthermore, the base protrusion 43 is configured to form a gap δ between itself and the sealing portion 51 of the rubber sealing portion 22.

[0074] Thus, for example, burrs generated when the valve seat 13 is pressed into the step portion 10 can be stored in the gap δ, preventing them from entering the interface between the valve seat base 21 and the rubber seal portion 22.

[0075] Furthermore, when the valve seat 13 is pressed into the stepped portion 10, and the rubber-formed sealing portion 51 abuts against the contact surface 31 and is compressed, a portion of the sealing portion 51 can enter the gap δ. Therefore, a portion of the sealing portion 51 is less likely to enter the valve hole 16 on the inner circumference side of the rubber sealing portion 22, and thus is less likely to affect the flow path of the valve hole 16. Consequently, it is less likely to affect the flow rate of the fluid controlled by the flow control valve 1.

[0076] In addition, the sealing portion 51 is formed such that, when not in contact with the contact surface 31, it protrudes towards the contact surface 31 from the base protrusion 43.

[0077] Thus, before the sealing portion 51 comes into contact with the abutment surface 31, the sealing portion 51 protrudes further towards the abutment surface 31 than the base protrusion 43. Therefore, when the valve seat 13 is pressed into the step portion 10 and the front end face 43a of the base protrusion 43 comes into contact with the abutment surface 31, the sealing portion 51 can be compressed while simultaneously contacting the abutment surface 31. Consequently, the base protrusion 43 can function as a stop when the valve seat 13 is pressed into the step portion 10, and the sealing portion 51 can more reliably seal the valve seat 13 and the housing 6.

[0078] In addition, the valve seat base 21 has two inclined sections 44.

[0079] Thus, the corner of the outer peripheral surface 41 of the valve seat base 21 near the abutment surface 31 is not formed as a sharp corner, but rather as two inclined sections 44 inclined in two sections toward the inner peripheral side. Therefore, when the valve seat 13 is pressed into the step portion 10, the two inclined sections 44 of the valve seat base 21 can avoid the rounded corner (i.e., curved section) and the beveled corner (i.e., straight section inclined like a chamfer) formed at the corner 34 where the abutment surface 31 intersects the pressing surface 32 of the step portion 10. Therefore, the valve seat base 21 is less likely to interfere with the corner 34 of the step portion 10.

[0080] Furthermore, regarding the corner of the end of the outer peripheral surface 41 of the valve seat base 21 near the abutting surface 31, if it is assumed to be formed as a single inclined section with an inclined shape, the pressing length of the outer peripheral surface 41 of the valve seat base 21 may be reduced. However, in this embodiment, it is formed as two inclined sections 44 with two inclined shapes, thus ensuring the pressing length of the outer peripheral surface 41 of the valve seat base 21.

[0081] In addition, the housing 6 has a press-in guide 33 on its stepped portion 10, which has a stepped portion 61 and an inclined portion 62.

[0082] Therefore, when the valve seat 13 is pressed into the pressing surface 32 of the stepped portion 10, the valve seat 13 can be guided by the inclined portion 62 through the inside of the stepped portion 61 while being pressed into the pressing surface 32. Thus, it is easy to press the valve seat 13 into the pressing surface 32.

[0083] In addition, the valve seat 13 is pressed into the stepped portion 10 of the housing 6 toward the side where the fuel cell stack 111 is located.

[0084] Therefore, even when the fuel cell stack 111 side becomes negative pressure, the valve seat 13 is not easily detached from the step portion 10 because it is pulled in the direction of being pressed into the step portion 10.

[0085] Furthermore, the above-described embodiments are merely illustrative and are not intended to limit the scope of this disclosure. Of course, various modifications and variations can be made without departing from the spirit of the invention.

[0086] For example, multiple inclined sections can also be formed into rounded corners.

[0087] Explanation of reference numerals in the attached figures

[0088] 1. Flow control valve; 2. Valve section; 6. Housing; 10. Stepped section; 12. Pipe section; 13. Valve seat; 14. Valve core; 15. Rotating shaft; 16. Valve hole; 17. Seat surface; 18. Sealing surface; 21. Valve seat base; 22. Rubber sealing part; 31. Abutment surface; 32. Press-in surface; 33. Press-in guide part; 34. Corner part; 41. Outer peripheral surface; 42. Abutment surface side end face; 43. Base protrusion; 43a. Front end face ; 44. Two inclined sections; 51. Sealing section (sealing section between valve seat and housing); 61. Stepped section; 62. Inclined section; 101. Fuel cell system; 111. Fuel cell stack; 112. Hydrogen system component; 113. Air system component; 131. Air supply passage; 132. Air exhaust passage; 133. Bypass passage; 141. Inlet sealing valve; 142. Outlet sealing valve; 143. Bypass valve; δ. Gap.

Claims

1. A flow control valve, comprising: Annular valve seat; Valve core, which abuts against and separates from the valve seat; and The valve body, which houses the valve seat and the valve core, is characterized in that... The valve seat includes: The annular valve seat base; and An annular valve seat sealing portion is located on the inner circumferential side relative to the valve seat base. The valve body includes: The valve body abutment surface is for the end of the valve seat base located on the axial side of the valve seat base to abut; and The valve body press-in surface is for pressing the outer peripheral surface of the valve seat base into. The valve seat sealing portion is provided with: A seat surface, formed axially at an end opposite to the valve body abutment surface of the valve seat sealing portion, abuts against the valve core when the flow control valve is in the closed state, thereby sealing the valve seat and the valve core; and A valve seat-valve body sealing portion is formed at an end on the valve body abutment surface side, protruding from the valve seat base towards the valve body abutment surface in the axial direction of the valve seat sealing portion. This valve seat-valve body sealing portion abuts against the valve body abutment surface to seal the valve seat and the valve body. The valve seat base has the following features at its axial end near the valve body abutment surface: The side end face of the contact surface; and, The base protrusion is formed such that it protrudes further from the end face of the abutment surface toward the abutment surface of the valve body. An annular gap is formed between the base protrusion and the sealing portion between the valve seat and valve body. The abutment surface side end face is opposite to the valve body abutment surface through the gap.

2. The flow control valve according to claim 1, characterized in that, The valve seat-valve body sealing portion is formed such that, when not in contact with the valve body contact surface, it protrudes further towards the valve body contact surface than the base protrusion.

3. The flow control valve according to claim 1 or 2, characterized in that, The valve seat base has multiple inclined sections at the end of its outer peripheral surface near the valve body contact surface. These multiple inclined sections are formed to be inclined in multiple segments from the outer peripheral surface of the valve seat base toward the inner peripheral side of the valve seat base.

4. The flow control valve according to claim 1 or 2, characterized in that, The valve body has the following features on its upstream side relative to the valve body pressing surface in the pressing direction toward the valve seat: A stepped portion, formed as a surface opposite to the outer peripheral surface of the valve seat base, and formed at a position radially outer of the valve seat base than the valve body press-in surface; and The inclined portion is formed to be inclined from the stepped portion toward the valve body pressing surface.

5. The flow control valve according to claim 1 or 2, characterized in that, The flow control valve is used in the fuel cell system. The valve seat is pressed into the valve body toward the side where the fuel cell is located.

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