reed valve

Abstract

The present application relates to a reed valve capable of suppressing occurrence of action failure caused by foreign matter. The reed valve (1) is provided with a valve element (4), a valve seat (6) having a valve hole (3) through which a fluid (J) can flow, a housing (8) that houses the valve element (4), and a reed (10) including an arm portion (18) and a valve element support portion (20), an end portion (22) of the arm portion (18) being fixed to the housing (8), the valve element support portion (20) being connected to the other end portion (24) of the arm portion (18) and supporting the valve element (4) in a manner to open and close the valve hole (3), if a direction of flow of the fluid (J) in the valve hole (3) is defined as a first direction (D1), and a surface of an inner surface of the housing (8) toward a downstream side of the first direction (D1) is defined as a first surface (21), then the first surface (21) includes a recessed portion (27) that opposes the arm portion (18).

Description

Technical Field

[0001] This disclosure relates to reed valves. Background Technology

[0002] A reed valve includes a valve seat with a valve orifice and a reed that can elastically deform to open and close the valve orifice. Such a reed valve achieves an open state, where the reed separates from the valve seat, by the fluid pressure of the fluid flowing through the valve orifice acting on the reed. Furthermore, when the fluid pressure is low or zero, the reed valve achieves a closed state, where the reed abuts against the valve seat. Patent Document 1 discloses, as an example of a reed valve, a solenoid valve capable of achieving a closed state using electromagnetic force.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2020-012515 Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In the reed valve described in Patent Document 1, the reed is configured such that one end is fixed and the other end is movable. When the reed separates from the valve seat, the size of the gap formed between the reed and the housing decreases as it moves toward one end. Therefore, if solid foreign matter mixed with the fluid gets stuck or accumulates in this gap, it may cause a malfunction that prevents the valve from maintaining a closed state.

[0008] This disclosure was made in view of the above-mentioned problems, and its object is to provide a reed valve that can suppress the occurrence of malfunction caused by foreign objects.

[0009] (II) Technical Solution

[0010] (1) A reed valve according to at least one embodiment of the present invention comprises: a valve core; a valve seat having a valve orifice through which fluid can flow; a housing for accommodating the valve core; and a reed including an arm and a valve core support portion, one end of the arm being fixed to the housing, the valve core support portion being connected to the other end of the arm and supporting the valve core in a manner that allows the valve orifice to be opened and closed, wherein if the flow direction of fluid in the valve orifice is defined as a first direction, and the surface of the inner surface of the housing facing downstream of the first direction is defined as a first surface, then the first surface includes a recess opposite to the arm.

[0011] (2) In some embodiments, in the reed valve described in (1) above, the width of the recess in the width direction of the arm may be greater than the width of the arm.

[0012] (3) In some embodiments, in the structure described in (1) or (2) above, it is also possible that, in the closed valve state where the valve core abuts against the valve seat, if the direction of the extension of the arm is defined as the extension direction, the end of one end side of the two ends of the arm is defined as one end, and the end of the other end side of the two ends of the arm is defined as the other end, then the recess includes an inclined surface that is inclined in the extension direction such that the recess becomes deeper as it moves toward one end side.

[0013] (4) In some embodiments, in the structure described in (1) or (2) above, it is also possible that, in the closed valve state where the valve core abuts against the valve seat, if the direction of the arm extension is defined as the extension direction, the end of one end side of the two ends of the arm is defined as one end, and the end of the other end side of the two ends of the arm is defined as the other end, then the recess is formed in the extension direction from the position between the valve hole and the fulcrum of the arm to the position between the fulcrum and one end.

[0014] (5) In some embodiments, in the structure described in (4) above, the recess may be formed on both sides of the fulcrum in the width direction of the arm portion, and in the extension direction, from the position between the valve hole and the fulcrum of the arm portion to the position between the fulcrum and one end.

[0015] (6) In some embodiments, in the structure described in (1) or (2) above, the arm may have a through hole through one end, and the first surface of the housing may have a protrusion inserted into the through hole. In the closed valve state where the valve core abuts against the valve seat, if the direction of extension of the arm is defined as the extension direction, the end of one end side of the two ends of the arm is defined as one end, the end of the other end side of the two ends of the arm is defined as the other end, and the position of the side of the protrusion closest to the other end side in the extension direction is defined as the first position, then the recess is formed in the extension direction from the position between the valve hole and the first position to the position between the first position and one end.

[0016] (7) In some embodiments, in the structure described in (6) above, the recess may be formed on both sides of the through hole in the width direction of the arm portion, and in the extension direction, from the position between the valve hole and the first position to the position between the first position and one end.

[0017] (8) In some embodiments, the structure described in (1) or (2) above may also include a solenoid unit including a coil.

[0018] (9) In some embodiments, in the structure described in (8) above, the solenoid unit may include an outer magnetic yoke disposed on the outer periphery of the coil, and the recess is recessed further upstream in the first direction than the end face of the downstream side of the outer magnetic yoke in the first direction.

[0019] (II) Beneficial Effects

[0020] According to at least one embodiment of the present disclosure, a reed valve is provided that can suppress malfunctions caused by foreign objects. Attached Figure Description

[0021] Figure 1 This is a perspective view schematically illustrating the structure of a reed valve according to one embodiment of the present disclosure. For illustration purposes, a portion of the structure of the reed valve is shown in exploded view.

[0022] Figure 2 yes Figure 1 The cross-sectional diagram of the reed valve shows the open state of the reed valve.

[0023] Figure 3 This is a perspective view schematically illustrating the structure of a reed according to one embodiment of the present disclosure.

[0024] Figure 4 It is Figure 2 An enlarged view of the periphery of the concave part, showing the reed valve in the closed state.

[0025] Figure 5 This is a diagram showing a reed valve according to an embodiment of the present disclosure viewed from the downstream side in the first direction. To illustrate the recess, the upstream housing has been removed.

[0026] Figure 6 This is a diagram showing the flow of fluid circulating within the reed valve involved in the comparative example.

[0027] Figure 7 This is a diagram illustrating the function and effect of a reed valve according to one embodiment of this disclosure.

[0028] Figure 8 This is a diagram schematically illustrating the structure of an inclined surface involved in some embodiments of this disclosure.

[0029] Explanation of reference numerals in the attached figures

[0030] 1-Reed valve; 2-Solenoid unit; 3-Valve hole; 4-Valve core; 6-Valve seat; 8-Housing; 10-Reed; 16-Outer yoke; 17-Downstream end face of the outer yoke in the first direction; 18-Arm; 19-Through hole; 20-Valve core support; 21-First face; 22-One end of the arm; 23-One end of the arm; 24-The other end of the arm; 25-The other end of the arm; 27-Recess; 32-Protrusion; 34-Inclined surface; 50-Fulcrum of the arm. Detailed Implementation

[0031] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the structural components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0032] For example, expressions such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" indicate a relative or absolute configuration, which not only strictly indicate such a configuration, but also indicate a state of relative displacement by an angle or distance with tolerance or to the extent that the same function can be obtained.

[0033] For example, expressions such as "same," "equal," and "homogeneous" that indicate that things are in an equal state not only strictly indicate the state of equality, but also indicate the state of having a tolerance or a difference in the degree to which they can obtain the same function.

[0034] For example, descriptions of shapes such as quadrilaterals and cylinders not only refer to quadrilaterals and cylinders in the strict sense of geometry, but also, within the range that can achieve the same effect, include shapes with concave and convex parts, chamfered parts, etc.

[0035] On the other hand, expressions such as "possessing," "having," "including," "comprise," or "having" a constituent element are not exclusive expressions that exclude the existence of other elements.

[0036] The structure of a reed valve 1 according to one embodiment of this disclosure will be described. For example... Figure 1 As shown, the reed valve 1 includes a valve core 4, a valve seat 6 with a valve hole 3, a housing 8, and a reed 10. Furthermore, as... Figure 2 As shown, the reed valve 1 also includes a solenoid unit 2. In this disclosure, the reed valve 1 is described using a solenoid valve that can achieve a closed state by using electromagnetic force to close the valve orifice 3 by the valve core 4. However, the reed valve 1 of this disclosure is not limited to a solenoid valve. For example, the reed valve 1 may not use electromagnetic force, but rather achieve an open state by the fluid pressure of the fluid flowing in the valve orifice 3 acting on the valve core 4 and the reed 10, thereby separating the valve core 4 from the valve seat 6, and achieving a closed state by the elastic force of the reed 10 when the fluid pressure becomes below a predetermined value. Alternatively, the reed valve 1 may achieve an open state by the fluid pressure of the fluid, and achieve a closed state by the electromagnetic force and the elastic force of the reed 10. In addition, the application of the solenoid valve of this disclosure is not particularly limited, for example, it may also be used to open and close the flow path of the engine coolant (fluid J).

[0037] The solenoid unit 2 includes a cylindrical coil 12, a cylindrical inner yoke 14 disposed on the inner periphery of the coil 12, and a cylindrical outer yoke 16 disposed on the outer periphery of the coil 12. The inner yoke 14 and the outer yoke 16 form a magnetic circuit when a current is applied to the coil 12. In this embodiment, the inner peripheral surface 14a of the inner yoke 14 forms part of the flow path for fluid J.

[0038] The valve core 4 is made of a magnetic material, and is attracted to the valve seat 6 by the electromagnetic force generated when an electric current is applied through the coil 12. For the reed valve 1 equipped with such a valve core 4, if the valve core 4 is pressed against the valve seat 6 to close the valve orifice 3, it is in a closed valve state; if the valve core 4 separates from the valve seat 6 and opens the valve orifice 3, it is in an open valve state. In this embodiment, as... Figure 3 As shown, the valve core 4 has a circular plate shape.

[0039] The valve seat 6 has a valve port 3 through which fluid J can flow. In this embodiment, as... Figure 2 As shown, the valve seat 6 is formed on the downstream end face 9 (hereinafter referred to as the end face 9 of the inner magnetic yoke 14) in the flow direction of the fluid J in the inner magnetic yoke 14. Furthermore, compared to the downstream end face 17 (hereinafter referred to as the end face 17 of the outer magnetic yoke 16) in the flow direction of the fluid J, the valve seat 6 protrudes slightly further downstream in the flow direction of the fluid J. Hereinafter, the flow direction of the fluid J in the valve hole 3 will be referred to as "first direction D1". Additionally, in some embodiments, the valve seat 6 may also be formed from the first surface 21 of the upstream housing 11, which will be described later.

[0040] The housing 8 has an internal chamber 5 that houses the valve core 4 and the spring 10. In this embodiment, as... Figure 1 and Figure 2 As shown, the housing 8 includes an upstream housing 11 and a downstream housing 13 located further downstream of the upstream housing 11 in the first direction D1. The upstream end of the downstream housing 13 in the first direction D1 engages with the downstream end of the upstream housing 11 in the first direction D1. The receiving chamber 5 is formed by being surrounded by the inner surfaces of the upstream housing 11 and the downstream housing 13.

[0041] Furthermore, in this embodiment, the receiving chamber 5 includes a valve core receiving chamber 5a that receives the valve core 4 and an arm receiving chamber 5b that receives the arm portion 18 of the reed 10 (described later). The arm receiving chamber 5b is offset from the valve core receiving chamber 5a in a direction perpendicular to the first direction D1. Hereinafter, the surface of the inner surface of the upstream housing 11 in which the arm receiving chamber 5b is formed, i.e., the surface facing downstream in the first direction D1, will be designated as "first surface 21", and the surface of the inner surface of the downstream housing 13 in which the arm receiving chamber 5b is formed, i.e., the surface opposite to the first surface 21, will be designated as "second surface 29".

[0042] like Figure 2 and Figure 3 As shown, the reed 10 is constructed of a leaf spring and includes an arm 18 and a valve core support 20. The arm 18 has an elongated shape extending in one direction, with one end 22 fixed to the housing 8. The valve core support 20 is connected to the other end 24 of the arm 18. Furthermore, the valve core support 20 supports the valve core 4 in a manner that allows the valve orifice 3 to be opened and closed. The valve core 4 is fixed to the valve core support 20, for example, by welding.

[0043] In this embodiment, such as Figure 3 As shown, the arm portion 18 and the valve core support portion 20 each have a plate-like shape. The valve core support portion 20 also has an annular shape, and the outer diameter of the circular plate-shaped valve core 4 is larger than the inner diameter of the annular valve core support portion 20. Furthermore, the inner diameter of the valve core support portion 20 is larger than the outer diameter of the valve seat 6, allowing the valve core 4 to abut against the valve seat 6 on the inner circumferential side of the valve core support portion 20. In addition, the valve core support portion 20 has a plate thickness less than or equal to the protrusion of the valve seat 6. Hereinafter, the direction in which the arm portion 18 extends in the closed valve state, where the valve core 4 abuts against the valve seat 6, will be designated as the "extension direction D2". Furthermore, the end 22 of one end of the arm portion 18 is designated as end 23, and the end 24 of the other end of the arm portion 18 is designated as end 25.

[0044] Here, an example of a method for fixing one end 22 of the arm 18 to the housing 8 will be described. For example... Figure 3 As shown, the arm portion 18 has a through hole 19 extending through one end portion 22 along the first direction D1. Furthermore, as... Figure 2 As shown, the downstream housing 13 includes a cylindrical protrusion 26 projecting from a second surface 29 toward an upstream side in a first direction D1. The front end face 28 of the protrusion 26 abuts against the downstream side face 30 of the arm 18 in the first direction D1. Furthermore, the first surface 21 of the upstream housing 11 has a protrusion 32 that inserts into a through hole 19 in the arm 18. In addition, this protrusion 32 fits into the inner surface of the protrusion 26 of the downstream housing 13. That is, in the front end face 28 (top surface) of the cylindrical protrusion 26, the portion on the other end 25 side in the extending direction D2 relative to the protrusion 32 functions as a fulcrum 50 of the arm 18.

[0045] Furthermore, the through hole 19 and the protrusion 32 each have a so-called D-cut shape with a semi-circular cross-section, thereby preventing the spring 10 from being installed backwards (preventing incorrect orientation of the spring 10 when installed towards the upstream housing 11). Additionally, the portion 28a of the front end face 28 of the protrusion 26, located closer to the other end 25 than the protrusion 32 in the extending direction D2, protrudes further upstream in the first direction D1 than the portion 28b of the front end face 28, located closer to one end 23 than the protrusion 32 in the extending direction D2. Furthermore, the portion 28b of the front end face 28 of the protrusion 26, located closer to one end 23 than the protrusion 32 in the extending direction D2, clamps the arm 18 with the upstream housing 11. Furthermore, the portion 28a of the front end face 28 of the protrusion 26, located closer to the other end 25 than the protrusion 32 in the extending direction D2, does not clamp the arm 18 with the upstream housing 11. That is, the gap along the first direction D1 between the portion 28a of the front end face 28 of the protrusion 26, which is closer to the other end 25 than the protrusion 32 in the extending direction D2, and the upstream housing 11 is larger than the plate thickness of the arm portion 18. According to this structure, the force that applies force to the valve core 4 against the valve seat 6 can be ensured, and the ingress of foreign objects between the arm portion 18 and the upstream housing 11 can be suppressed.

[0046] Reference Figure 4 The recess 27 according to one embodiment of this disclosure will be described below. Figure 4 As shown, the first surface 21 of the upstream housing 11 includes a recess 27 opposite to the arm portion 18. In this embodiment, the recess 27 includes a bottom surface 33 and an inclined surface 34. Hereinafter, the position on the side of the protrusion 32 closest to the other end 25 in the extending direction D2 will be designated as the "first position P1".

[0047] The bottom surface 33 of the recess 27 is closer to the upstream side of the first direction D1 than the downstream end face 17 of the outer magnetic yoke 16. That is, the recess 27 is recessed further upstream of the first direction D1 than the downstream end face 17 of the outer magnetic yoke 16. Furthermore, the bottom surface 33 of the recess 27 is formed along a plane orthogonal to the first direction D1 in the extending direction D2, maintaining a certain depth of the recess 27.

[0048] The inclined surface 34 of the recess 27 is inclined in the extending direction D2 such that the recess 27 becomes deeper toward the end 23 of the arm 18. The distance d between the inclined surface 34 and the upstream side surface 35 of the arm 18 in the first direction D1 increases in the extending direction D2 toward the end 23 of the arm 18 when the valve core 4 abuts against the valve seat 6 (closed valve state). Furthermore, the inclined surface 34 connects to the bottom surface 33 at the portion where the distance d becomes a predetermined size.

[0049] Furthermore, in this embodiment, the inner surface of the upstream housing 11 includes a first plane 36 and a second plane 38 forming the valve core receiving chamber 5a. The first plane 36 and the second plane 38 are respectively surfaces facing the downstream side in the first direction D1. When viewed from the downstream side in the first direction D1, the end face 17 of the outer magnetic yoke 16 has an annular shape. The first plane 36 is located on the outer peripheral side of the end face 17 of the outer magnetic yoke 16 and is flush with the end face 17 of the outer magnetic yoke 16. The second plane 38 is located on the inner peripheral side of the end face 17 of the outer magnetic yoke 16 and is flush with the end face 17 of the outer magnetic yoke 16.

[0050] A portion of the first plane 36 is disposed between the inclined surface 34 and the end face 17 of the outer yoke 16 in the extending direction D2, connecting the inclined surface 34 and the end face 17 of the outer yoke 16. For example, a portion of the first plane 36 is located closer to the end 23 of the arm 18 than the valve hole 3 in the extending direction D2. A portion of the second plane 38 is disposed between the end face 17 of the outer yoke 16 and the end face 9 of the inner yoke 14, connecting the end face 17 of the outer yoke 16 and the end face 9 of the inner yoke 14. For example, a portion of the second plane 38 is located closer to the end 23 of the arm 18 than the valve hole 3 in the extending direction D2. In the extending direction D2, the following arrangements are made: the bottom surface 33 of the recess 27, the inclined surface 34 of the recess 27, a portion of the first plane 36, the end face 17 of the outer yoke 16, a portion of the second plane 38, and the end face 9 (valve seat 6) of the inner yoke 14.

[0051] Figure 5 This diagram shows the reed valve 1 viewed from the downstream side of the first direction D1, and is a diagram of the upstream housing 11 removed to illustrate the recess 27. Hereinafter, the position on the other end 25 side of the recess 27 in the extending direction D2 will be designated as "second position P2". The position on the other end 23 side of the recess 27 in the extending direction D2 will be designated as "third position P3".

[0052] In this embodiment, such as Figure 5 As shown, the width W1 of the recess 27 in the width direction D3 of the arm 18 is greater than the width W2 of the arm 18. Furthermore, the recess 27 is formed on both sides of the fulcrum 50 in the width direction D3 of the arm 18, from the second position P2 to the third position P3. Furthermore, in Figure 5 In the illustrated embodiment, the recess 27 is formed on both sides of the through hole 19 in the width direction D3 of the arm portion 18, extending from the second position P2 to the third position P3. In this disclosure, the width direction D3 of the arm portion 18 is a direction orthogonal to the first direction D1 and the extending direction D2, respectively.

[0053] In the illustrated exemplary embodiment, the recess 27 has a two-strand shape and includes a main recess 27A and two secondary recesses 27B, 27B extending from the main recess 27A toward one end 23 in the extending direction D2. The main recess 27A is disposed in the extending direction D2 within a range from a fourth position P4 to a second position P2 between a first position P1 and a second position P2, and includes a first portion 31a of a fixed width and a second portion 31b whose width increases toward the other end 25 of the arm 18 in the extending direction D2. The second portion 31b is located closer to the other end 25 of the arm 18 than the first portion 31a in the extending direction D2 and is connected to the first portion 31a. The two secondary recesses 27B, 27B are respectively disposed in the extending direction D2 within a range from the fourth position P4 to a third position P3. Furthermore, one secondary recess 27B is located on the opposite side of the other secondary recess 27B, separated by a protrusion 32. Furthermore, in the plan view viewed from the downstream side of the first direction D1, the contour portion 41a of the recess 27, located closer to the end 23 of the arm 18 in the extension direction D2 than the fourth position P4, includes: two concave curve portions 42a and 42b recessed towards the end 23 of the arm 18 in the extension direction D2; and a convex curve portion 43 connecting the two concave curve portions 42a and 42b in a manner that protrudes towards the other end 25 of the arm 18 in the extension direction D2. One of the two concave curve portions 42a is located on one side of the protrusion 32 in the width direction D3, and the other of the two concave curve portions 42b is located on the other side of the protrusion 32 in the width direction D3. The convex curve portion 43 curves smoothly along the side of the protrusion 32 in the width direction D3, towards the other end 25 of the arm 18 as it moves towards the center of the protrusion 32.

[0054] Furthermore, in this embodiment, in the extending direction D2, the second position P2 is the position between the valve hole 3 and the fulcrum 50 of the arm 18, and the third position P3 is the position between the fulcrum 50 of the arm 18 and one end 23 of the arm 18. In the illustrated exemplary embodiment, in the extending direction D2, the second position P2 is the position between the valve hole 3 and the first position P1, and the third position P3 is the position between the first position P1 and one end 23 of the arm 18.

[0055] The function and effects of the reed valve 1 according to one embodiment of this disclosure will be explained. For example, as Figure 6As shown in the comparative example, if the first surface 21, excluding the recess 27 opposite to the arm 18, is flush with the downstream end face 17 of the outer magnetic yoke 16 in the first direction D1, the size of the gap 40 formed between the arm 18 and the first surface 21 of the upstream housing 11 decreases as it extends toward the end 23 of the arm 18 in the extending direction. Therefore, if a solid foreign object 100 mixed with the fluid J gets stuck or accumulates in this gap 40, a malfunction may occur that prevents the valve from maintaining its closed state. Furthermore, the foreign object 100 could be, for example, sand mixed into the engine's cooling water.

[0056] However, according to this embodiment, such as Figure 7 As shown, the first surface 21 of the upstream housing 11 has a recess 27 opposite to the arm 18. Therefore, compared with the comparative example, the size of the gap 40 formed between the arm 18 and the recess 27 of the first surface 21 of the upstream housing 11 can be increased, and foreign matter 100 flowing into the gap 40 can flow out through the gap 40. Therefore, it is possible to suppress the biting and accumulation of foreign matter 100 into the gap 40, and to suppress the occurrence of malfunction in which the reed valve 1 cannot maintain the closed state. In other words, the resistance of the reed valve 1 to foreign matter can be improved.

[0057] Furthermore, according to this embodiment, the width of the recess 27 in the width direction D3 of the arm portion 18 is greater than the width of the arm portion 18, so that the foreign matter 100 flowing into the gap 40 can flow smoothly out from the recess 27.

[0058] Furthermore, according to this embodiment, the inclined surface 34 is inclined in the extending direction D2 such that the recess 27 becomes deeper toward the end 23 of the arm portion 18, thus allowing foreign matter 100 entering the gap 40 to flow smoothly out of the recess 27 along the inclined surface 34. Additionally, in some embodiments, such as... Figure 8 As shown, regarding the inclined surface 34, the cross-sectional shape along the extension direction D2 over the entire width W1 includes: a convex curved portion 39a that curves convexly towards the downstream side of the first direction D1, a flat portion 39b that is a plane, and a concave curved portion 39c that curves concavely towards the upstream side of the first direction D1. In the extension direction D2, the convex curved portion 39a, the flat portion 39b, and the concave curved portion 39c are arranged in that order. The other end 25 of the arm portion 18 of the convex curved portion 39a in the extension direction D2 is connected to the first plane 36, and the one end 23 of the arm portion 18 of the concave curved portion 39c in the extension direction D2 is connected to the bottom surface 33.

[0059] Furthermore, according to this embodiment, the recess 27 is recessed further upstream of the first direction D1 than the downstream end face 17 of the outer magnetic yoke 16. With this structure, the distance between the outer magnetic yoke 16 and the valve core 4 can be reduced, and the gap 40 between the arm portion 18 and the recess 27 can be increased. Therefore, when the coil 12 is energized, the force pulling the valve core 4 towards the valve seat 6 can be increased, and the aforementioned foreign matter 100 can be suppressed from entering and accumulating in the gap 40. Therefore, the occurrence of malfunction in which the reed valve 1 fails to maintain a closed state can be effectively suppressed.

[0060] Furthermore, according to this embodiment, the recess 27 extends in the extending direction D2 from a second position P2 between the valve hole 3 and the fulcrum 50 of the arm 18 to a third position P3 between the fulcrum 50 of the arm 18 and one end 23 of the arm 18. Therefore, fluid J can be guided to a position further inward than the fulcrum 50 of the arm 18, and the ingress and accumulation of foreign matter 100 near the fulcrum 50 of the arm 18 can be effectively suppressed. Furthermore, when the reed valve 1 is positioned such that one end 23 of the arm 18 is positioned further downward in the direction of gravity than the other end 25, a portion of the recess 27 can function as a storage bag for foreign matter 100 at a position further downward than the fulcrum 50 of the arm 18, thus effectively suppressing the ingress of foreign matter 100.

[0061] Furthermore, according to this embodiment, the recess 27 is formed on both sides of the fulcrum 50 of the arm 18 in the width direction D3, extending from a second position P2 between the valve hole 3 and the fulcrum 50 of the arm 18 to a third position P3 between the fulcrum 50 of the arm 18 and one end 23 of the arm 18 in the extension direction D2. Therefore, fluid J can be guided to a position further inward than the fulcrum 50 of the arm 18 on both sides of the arm 18, effectively suppressing the biting and accumulation of foreign matter 100 around the fulcrum 50 of the arm 18. Furthermore, when the reed valve 1 is positioned such that one end 23 of the arm 18 is positioned lower in the direction of gravity than the other end 25, a portion of the recess 27 can function as a storage bag for foreign matter 100 at a position lower than the fulcrum 50 of the arm 18, thus effectively suppressing the biting of foreign matter 100.

[0062] The above describes a reed valve according to one embodiment of the present invention. However, the present invention is not limited to the above-described manner, and various modifications can be made without departing from the purpose of the present invention.

Claims

1. A reed valve comprising: a valve element; a valve seat having a valve hole through which a fluid can flow; a housing accommodating the valve element; and a reed including an arm portion and a valve element support portion, one end of the arm portion being fixed to the housing, the valve element support portion being connected to the other end of the arm portion and supporting the valve element in a manner to open and close the valve hole, wherein if a direction of flow of the fluid in the valve hole is defined as a first direction, and a surface of an inner surface of the housing facing a downstream side of the first direction is defined as a first surface, the first surface includes a recess portion opposite the arm portion, wherein in a closed valve state in which the valve element is in contact with the valve seat, if a direction in which the arm portion extends is defined as an extension direction, an end on the one end portion side of both ends of the arm portion is defined as a one end, and an end on the other end portion side of both ends of the arm portion is defined as a other end, the recess portion includes: a bottom surface; and an inclined surface connected to the bottom surface and inclined in the extension direction in a manner that the recess portion becomes deeper as it approaches the one end side.

2. The reed valve according to claim 1, wherein a width of the recess portion in a width direction of the arm portion is greater than a width of the arm portion.

3. The reed valve according to claim 1 or 2, wherein in the closed valve state in which the valve element is in contact with the valve seat, if a direction in which the arm portion extends is defined as an extension direction, an end on the one end portion side of both ends of the arm portion is defined as a one end, and an end on the other end portion side of both ends of the arm portion is defined as a other end, the recess portion is formed in the extension direction from a position between the valve hole and a fulcrum of the arm portion to a position between the fulcrum and the one end.

4. The reed valve according to claim 3, wherein the recess portion is formed in the extension direction from a position between the valve hole and the fulcrum of the arm portion to a position between the fulcrum and the one end on both sides of the fulcrum in the width direction of the arm portion.

5. The reed valve according to claim 1 or 2, wherein the arm portion has a through-hole passing through the one end portion, the first surface of the housing has a protrusion inserted into the through-hole, in the closed valve state in which the valve element is in contact with the valve seat, if a direction in which the arm portion extends is defined as an extension direction, an end on the one end portion side of both ends of the arm portion is defined as a one end, and an end on the other end portion side of both ends of the arm portion is defined as a other end, a position of a side surface of the protrusion on the other end side in the extension direction is defined as a first position, and the recess portion is formed in the extension direction from a position between the valve hole and the first position to a position between the first position and the one end.

6. The reed valve according to claim 5, wherein the recess portion is formed in the extension direction from a position between the valve hole and the first position to a position between the first position and the one end on both sides of the through-hole in the width direction of the arm portion.

7. The reed valve according to claim 1 or 2, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Further provided is a solenoid unit including a coil.

8. The reed valve according to claim 7, characterized in that The solenoid unit includes an outer magnetic yoke provided on an outer peripheral side of the coil, The recess is recessed more toward an upstream side in the first direction than an end surface of the outer magnetic yoke on a downstream side in the first direction.

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