Pressure relief valve

Abstract

To provide a pressure release valve capable of stabilizing the sliding operation of a valve element.SOLUTION: The pressure release valve 10 includes the base member 20, the valve element 40, and the spring member 70, the base member 20 is formed with the base-side guide portion extending in the valve axis direction, the valve element 40 includes the ceiling portion 42 disposed to face the vent hole 24 and the peripheral wall portion 45 extending from the ceiling portion 42 in the valve axis direction, and the inner side of the peripheral wall portion 45 forms the valve element-side guide portion 50 that guides the base-side guide portion to guide the sliding operation of the valve element 40 in the valve axis direction.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a pressure relief valve that is attached to a workpiece to relieve pressure within the workpiece. [Background technology]

[0002] For example, hybrid vehicles and electric vehicles use electricity storage devices such as batteries and capacitors. In the case of batteries such as lithium-ion batteries, the pressure in such electricity storage devices can increase due to gas generated by a chemical reaction in the electrolyte. In this case, it is necessary to release the pressure by discharging the gas from inside the electricity storage device to the outside of the electricity storage device.

[0003] Patent Document 1 below describes a balanced explosion-proof valve having a valve disc with a valve outer ring body, a first seal ring arranged on the inner peripheral edge of the valve outer ring body, a piston that slides relative to the valve disc to move toward and away from the first seal ring, and a spring that urges the piston toward the first seal ring. The piston has a head and a guide rod that protrudes from the center of the back side of the head, and this guide rod is guided by a substantially cylindrical valve inner ring body that is arranged inside the valve outer ring body and in the radial center of the valve disc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO2024 / 066615A1 Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of the balanced explosion-proof valve described in Patent Document 1, the piston slide guide is provided at the radial center of the explosion-proof valve by a guide rod protruding from the center of the back side of the piston head and a valve inner ring body located in the radial center of the valve disc. In this case, when the piston slides (strokes), the piston may tilt and its posture may become unstable, resulting in unstable sliding of the piston.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pressure relief valve capable of stabilizing the sliding movement of the valve body. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a pressure release valve to be attached to a workpiece, comprising: a base member fixed to the workpiece and having a valve seat and a vent hole formed therein; a valve body that is slidable relative to the base member and moves toward and away from the valve seat to open and close the vent hole; and a spring member that urges the valve body toward the valve seat, wherein the base member is formed with a base-side guide portion extending in the valve axis direction, and the valve body has a ceiling portion positioned opposite the vent hole and a peripheral wall portion extending from the ceiling portion in the valve axis direction, and the inside of the peripheral wall portion forms a valve body-side guide portion that guides the base-side guide portion to guide the sliding movement of the valve body in the valve axis direction. [Effects of the Invention]

[0008] According to the pressure release valve of the present invention, the sliding movement of the valve body can be guided by the base side guide portion and the valve body side guide portion, and the valve body side guide portion formed inside the peripheral wall portion of the valve body guides the outer edge portion of the base side guide portion, so that the sliding structure of the valve body can be provided closer to the outside of the valve body, making it difficult for the valve body to tilt in the valve axis direction during the sliding movement of the valve body, stabilizing its posture and stabilizing the sliding movement (stroke movement) of the valve body. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an exploded perspective view of an embodiment of a pressure relief valve according to the present invention; FIG. [Figure 2] FIG. [Figure 3] 3 is a perspective view of the pressure release valve as seen from a direction different from that of FIG. 2. FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is an enlarged perspective view of a base member constituting the pressure release valve. [Figure 6] 6 is an enlarged perspective view of a base member constituting the pressure release valve, seen from a direction different from that of FIG. 5. FIG. [Figure 7] FIG. 4 is a bottom view of a base member constituting the pressure release valve. [Figure 8] 2 is an enlarged perspective view of a valve body constituting the pressure release valve, seen from a direction different from that of FIG. 1. FIG. [Figure 9] FIG. 2 is an enlarged perspective view of a spring pressing member that constitutes the pressure release valve. [Figure 10] FIG. 5 is a cross-sectional view taken along the line AA in FIG. 4. [Figure 11] 11 is a cross-sectional view showing a state in which the valve disc is moved away from the valve seat to the maximum extent from the state shown in FIG. 10, and the vent hole is opened. [Figure 12] 5 is a cross-sectional view taken along the line BB in FIG. 4, showing the state in which the valve body is at the maximum distance from the valve seat and the vent hole is open. [Figure 13A] FIG. 10 is a cross-sectional view of a pressure relief valve of a comparative example. [Figure 13B] FIG. 2 is a perspective view of a base material constituting the pressure release valve. [Figure 14] 1 is a graph showing the results of a flow rate confirmation test for an example and a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0010] (One embodiment of a pressure relief valve) Hereinafter, an embodiment of a pressure relief valve according to the present invention will be described with reference to the drawings.

[0011] As shown in Figures 10 to 12, this pressure release valve 10 (hereinafter simply referred to as "release valve 10") is attached to an attachment hole 3 of an attachment member 1 that houses, for example, an electrical storage device, etc., and is designed to release (reduce) the pressure within the attachment member 1 by venting gas within the attachment member 1 when the pressure within the attachment member 1 increases.

[0012] Examples of the power storage device accommodated in the attachment member 1 include batteries (lithium ion batteries, etc.), condensers, and capacitors used in hybrid vehicles including plug-in hybrid vehicles, electric vehicles, etc., but other devices, parts, etc. may also be used. The attachment hole 3 formed in the attachment member 1 is a circular hole.

[0013] As shown in Figure 10, the internal space of the workpiece 1 (meaning the lower space in Figure 10, with the wall of the workpiece 1 as the boundary) is referred to as internal space R1, and the external space of the workpiece 1 (meaning the upper space in Figure 10, with the wall of the workpiece 1 as the boundary) is referred to as external space R2.

[0014] As shown in Figures 1 to 3 and 10 to 12, the release valve 10 in this embodiment is mainly composed of a base member 20 that is fixed to the attachment member 1 and has a valve seat 23 and an air vent 24 on its inside, a valve body 40 that is slidable relative to the base member 20 and moves toward and away from the valve seat 23 to open and close the air vent 24, a sealing member 38 that is arranged on the back side of the valve body 40 to ensure sealing with the surface of the attachment member 1 (the attachment surface of the release valve 10), a spring member 70 (a coil spring in this embodiment) that urges the valve body 40 toward the valve seat 23, and a spring presser member 60 that supports one end of the spring member 70.

[0015] Furthermore, the base member 20 is formed with a base-side guide portion (in this embodiment, the outer edge portion 35 of the plate-shaped portion 30 shown in Figs. 5 and 12) that extends in the valve axis direction. Note that the "valve axis direction" refers to the direction along the axis C (see Figs. 10 to 12) of the pressure release valve 10 or the valve body 40 (the valve axis direction of other members has the same meaning). Furthermore, in the following description, the "back side" or "rear side" of each member such as the base member 20 or the valve body 40 refers to the side that is close to the attached member 1, unless otherwise specified, and the "front side" or "front surface side" refers to the opposite side to the "back side" or "rear side" (the side that is away from the attached member 1).

[0016] First, a detailed description will be given of the base member 20. As shown in Figures 5 and 6, the base member 20 of this embodiment has a substantially cylindrical main body tubular portion 21 and a flange portion 22 that protrudes (expands) from the outer periphery of the base end of the main body tubular portion 21 to form a substantially diamond shape.

[0017] Referring also to Figure 10, the inner peripheral shape of the main body cylindrical portion 21 has a first inner peripheral surface 21a of a predetermined diameter located on one axial end (lower end) side of the main body cylindrical portion 21, and a second inner peripheral surface 21c which has a larger diameter than the first inner peripheral surface 21a via a stepped portion 21b and is located on the other axial end (upper end) side of the main body cylindrical portion 21.

[0018] Additionally, the outer peripheral edge of the main body tubular portion 21 on the surface side of the flange portion 22 forms the valve seat 23. The inner space of the main body tubular portion 21, radially inward of this valve seat 23, forms an air vent 24 that connects the internal space R1 and the external space R2 of the attached member 1 to each other.

[0019] An annular protrusion 22a is provided on the surface side of the flange portion 22, radially outward of the valve seat 23, so as to surround the valve seat 23 and the vent hole 24. In addition, bosses 22b, 22b for attachment to the attached member 1 are formed near both longitudinal ends of the flange portion 22. As shown in Figures 3 and 4, an outer peripheral wall 25 extends from the periphery on the back side of the flange portion 22, and an inner peripheral wall 26 extends inside this outer peripheral wall 25. A seal member 38 is disposed between these peripheral walls 25, 26.

[0020] As shown in Figures 10 to 12, the base member 20 is formed with a plate-shaped portion 30 that extends along the valve axis direction and further toward the valve seat 23 in the valve body opening direction (the direction in which the valve body 40 moves away from the valve seat 23 to open the ventilation port 24), and the outer edge portion 35 of this plate-shaped portion 30 forms a base side guide portion.

[0021] More specifically, the plate-shaped portions 30 are thin-walled plates that extend elongatedly along the valve axis direction and in the valve body opening direction, and as shown in Figures 5 to 7, multiple portions (eight in this embodiment) are arranged radially at equal intervals from the axis C1 (radial center) of the base member 20 and the main body cylindrical portion 21.

[0022] 10, each plate-like portion 30 has a base portion 31 disposed on one end side in the extension direction and connected to the first inner circumferential surface 21a, the stepped portion 21b, and the second inner circumferential surface 21c of the main body tubular portion 21, and an extension portion 32 extending a predetermined length from the base portion 31 along the valve axis direction and in the valve disc opening direction so as to be longer than the valve seat 23. Each plate-like portion 30 is formed in the shape of a thin plate with a constant thickness over the entire extension direction from one end of the base portion 31 to the other end of the extension portion 32 (see FIGS. 5 and 6).

[0023] 5, the other ends of the extension portions 32 of the plate-like portions 30 are connected to each other by a connecting portion 33 having a substantially circular ring shape with a circular hole 33a formed in the center. As shown in FIGS. 10 to 12, the other end of the spring member 70 in the extension direction is supported on the back side of the connecting portion 33 and on the periphery of the circular hole 33a. Furthermore, a cylindrical portion 33b protrudes from the back side of the connecting portion 33 and on the periphery of the circular hole 33a, and the shaft portion 43 of the valve body 40 is slidably inserted into the cylindrical portion 33b to guide the shaft portion 43.

[0024] Each thin-plate-shaped portion 30 has an inner edge 34 facing toward the radial center of the base member 20, and an outer edge 35 located on the opposite side of the inner edge 34. Portions 34a, 35a of the side edges 34, 35 located at the base 31 are inclined so that the base 31 gradually narrows slightly as it moves away from one axial end of the tubular main body portion 21 (see FIG. 12). As shown in FIG. 12, the base end 35c of the outer edge 35 is positioned closer to the one axial end than the valve seat 23.

[0025] In addition, the portion 35b of the outer edge 35 located at the extension portion 32 extends almost parallel along the valve axis direction, while the portion 32b of the inner edge 34 located at the extension portion 32 has an inclined shape that gradually becomes slightly wider toward the other end side of the extension direction of the extension portion 32 (the connecting portion 33 side).

[0026] 6, 7, 10, and 12, a restricting portion 34c that restricts the axial direction of the spring presser member 60 is provided on the inner edge portion 34 of a predetermined plate-like portion 30, midway along the valve axis. In this embodiment, of the eight plate-like portions 30 arranged radially, every other four plate-like portions 30 have a stepped restricting portion 34c that is perpendicular to the valve axis direction, between a portion 34a located at the base portion 31 and a portion 34b located at the extension portion 32, on the inner edge portion 34.

[0027] The outer edge 35 of the plate-shaped portion 30 having the restricting portion 34c, which is a portion 35b located on the extension portion 32, is inserted into a recessed valve body side guide portion 50 (described later) (see Figure 12), so that the sliding movement of the valve body 40 is guided along the valve axis direction, as shown in Figures 10 to 12.

[0028] That is, in this embodiment, of the eight plate-shaped portions 30, the portions 35b located on the extension portions 32 of the outer edge portions 35 of the four plate-shaped portions 30 that are provided with the regulating portions 34c form the "base side guide portion" in the present invention and also form the "insertion portion" in the present invention.

[0029] Next, the valve element 40 will be described in detail. As shown in Figures 1, 2, 8, and 10 to 12, the valve element 40 of this embodiment has a valve body 41 and a seal portion 55 made of an elastic material such as rubber or an elastic elastomer and attached to the valve body 41. The valve element as a whole has a generally hat shape with a closed ceiling side and a flange-like protruding base end side.

[0030] The seal portion 55 has a substantially annular shape, and is provided with an elastically deformable seal lip 56 on the radially inner inner peripheral edge portion on the back side thereof, which is in contact with the valve seat 23 of the base member 20. In addition, an annular portion 57 is provided on the radially outer outer peripheral edge portion on the back side of the seal portion 55, and is disposed on the outer periphery of the annular protrusion 22a of the base member 20.

[0031] The valve body 41 has a ceiling portion 42 disposed opposite the vent port 24, a shaft portion 43 protruding from the back side of the ceiling portion 42, and a peripheral wall portion 45 disposed on the outside of the shaft portion 43 and extending from the ceiling portion 42 in the valve axis direction, and is generally cylindrical with an open side opposite the ceiling portion 42. The inside of the peripheral wall portion 45 forms a valve body side guide portion 50 that guides the base side guide portion and guides the sliding movement of the valve body 40 in the valve axis direction.

[0032] Describing the valve body 41 in more detail, the ceiling portion 42 is a generally circular plate-like member disposed opposite the vent hole 24. The shaft portion 43 has a generally cross-shaped cross section perpendicular to the axial direction, and protrudes a predetermined length from the radial center of the back side of the ceiling portion 42. One axial end portion 44 of the shaft portion 43 is formed with a plurality of notches 44a for mounting the spring presser member 60 (see FIG. 8).

[0033] The peripheral wall portion 45 is disposed radially outward from the shaft portion 43 and has a generally cylindrical shape extending a predetermined length from the radially outer peripheral edge of the ceiling portion 42 along the valve axis direction. A stepped portion 45a is formed on the inner periphery of one axial end portion of the peripheral wall portion 45 (see FIG. 8). Furthermore, as shown in FIG. 2, a plurality of bulging portions 47, which bulge to a predetermined height from the outer peripheral surface, are provided on the outer periphery of the peripheral wall portion 45 at equal intervals in the circumferential direction and extend along the axial direction. In this embodiment, four bulging portions 47 are provided.

[0034] 8, a pair of guide ribs 51, 51 are arranged parallel to each other and extend in the axial direction of the peripheral wall 45 at a position radially inward of the peripheral wall 45 and corresponding to the bulging portion 47. The other end of each guide rib 51 in the extending direction is connected to the rear surface of the ceiling 42, and one end in the extending direction extends beyond the stepped portion 45a to one axial end face of the peripheral wall 45.

[0035] A guide groove-like recess extending along the axial direction of the peripheral wall portion 45 is formed inside the pair of guide ribs 51, 51, the inner surface of the corresponding bulge portion 47, and a predetermined location on the back surface of the corresponding peripheral wall portion 45, and this recess serves as the valve body side guide portion 50. The valve body side guide portion 50 formed as a recess is formed with a constant width (circumferential length) and a constant depth (radial length) from one end in the extension direction (the end portion located opposite the ceiling portion 42) to the other end (the end portion located on the ceiling portion 42 side).

[0036] Furthermore, the width of the valve body-side guide portion 50, which is formed as a recess (the length between the parallel inner surfaces of the recess, which can also be said to be the length between the inner surface of one guide rib 51 and the inner surface of the other guide rib 51), is sized to fit the thickness (the length between both outer surfaces in the circumferential direction) of the outer edge portion 35 that forms the base-side guide portion of the plate-like portion 30. The outer edge portion 35 of the plate-like portion 30 is slidably inserted into the valve body-side guide portion 50, and a predetermined inner surface of the recess and the corresponding outer surface of the base-side guide portion are arranged close to each other and facing each other.

[0037] Then, the portion 35b located on the extension portion 32 of the outer edge portion 35 of the plate-shaped portion 30 provided with the regulating portion 24c is inserted into each valve body side guide portion 50 which is recessed, thereby guiding the sliding movement of the valve body 40 along the valve axis direction, as shown in Figures 10 to 12.

[0038] As shown in Figure 8, an inclined surface 50a is formed on the inner peripheral edge of one end of the valve body side guide portion 50, which is recessed, in the extension direction, which improves the insertability of the outer edge portion 35 of the plate-shaped portion 30 into the valve body side guide portion 50 when assembling the release valve 10.

[0039] Next, the spring retainer member 60 will be described in detail. As shown in Figure 9, this spring retainer member 60 is attached to the shaft portion 43 in a state where rotation around the valve shaft is restricted, and supports one end of the spring member 70, and has a substantially cylindrical tubular portion 61 into which one end 44 of the shaft portion 43 of the valve body 40 is inserted, and an annular flange portion 62 that extends from the outer periphery of one axial end of the tubular portion 61 and against which one end of the spring member 70 in the extending direction abuts.

[0040] The cylindrical portion 61 is formed with a plurality of (four in this case) insertion holes 63 into which the substantially cross-shaped one end 44 of the shaft portion 43 is inserted. Furthermore, a plurality of (four in this case) fitting recesses 64 into which the one end 44 of the shaft portion 43 is fitted are formed on the inner surface of the other end side in the extension direction of the cylindrical portion 61 (the side opposite the flange portion 62). Furthermore, a plurality of (four) protrusions 65 are provided at equal intervals in the circumferential direction on the outer periphery of the one end side in the extension direction of the cylindrical portion 61, protruding from positions that coincide circumferentially with the four insertion holes 63.

[0041] Then, with the other end of the spring member 70 supported on the peripheral portion of the circular hole 33a on the back side of the connecting portion 33 of the base member 20 and one end of the spring member 70 supported on the front side of the flange portion 62, the spring member 70 is compressed while one end 44 of the shaft portion 43 is inserted through the insertion hole 63, and then the spring pressing member 60 is rotated in a predetermined direction relative to the shaft portion 43, whereby one end 44 of the shaft portion 43 is fitted into each fitting recess 64, and the spring pressing member 60 is attached in a state where its rotation is restricted relative to the shaft portion 43 and it is prevented from coming off.

[0042] In the above state, the multiple protrusions 65 are positioned to align with the restricting portions 34c provided on the plate-shaped portion 30 (see Figures 3 and 4), and the multiple protrusions 65 are able to abut against the corresponding restricting portions 34c.

[0043] As a result, both ends of the spring member 70 are supported by the spring retaining member 60 and the connecting portion 33 of the base member 20, and the spring member 70 is held in a compressed state outside the shaft portion 43 of the valve body 40 so as to prevent it from coming loose. Therefore, the spring force of the spring member 70 causes the seal lip 56 of the seal portion 55 of the valve body 40 to abut against the valve seat 23 of the base member 20, and the air vent 24 is maintained in a closed state.

[0044] (Variation) The shapes, structures, layouts, etc. of the base member, valve body, seal member, spring retainer member, base side guide portion, valve body side guide portion, etc. that constitute the pressure release valve of the present invention are not limited to the above embodiments.

[0045] For example, the base member may have a shape in which a circular plate-shaped flange portion protrudes from the outer periphery of the cylindrical portion, or the inner periphery of the cylindrical portion may have a sloped surface without any steps. Furthermore, the first guide portion may be not only a thin plate-shaped portion, but also a pillar-shaped portion, a rod-shaped portion, a wall portion of a predetermined width, or the like.

[0046] In this embodiment, the outer edge 35 of the plate-shaped portion 30, which forms the base-side guide portion, and the valve body-side guide portion 50 of the valve body 40, which is a recess, form a sliding guide for the valve body 40 in the valve axis direction.However, as mentioned above, the cylindrical portion 33b provided on the connecting portion 33 of the base member 20 is positioned close to the outside of the shaft portion 43 of the valve body 40 (see Figures 10 to 12), and it can be said that this portion also forms a sliding guide for the valve body 40 in the valve axis direction.

[0047] That is, in this embodiment, a valve disc slide guide is provided on the radially outer side of the valve disc, and a valve disc slide guide is also provided as a backup on the radially inner side (radial center) of the valve disc, resulting in a structure in which two valve disc slide guides are provided on the radially outer and radially inner sides of the valve disc. However, it is not necessary to provide a valve disc slide guide on the radially inner side of the valve disc.

[0048] In this embodiment, the cylindrical portion 33b provided on the connecting portion 33 connecting the other ends of the plate-like portions 30 in the extension direction serves as a slide guide inside the valve body as described above, but for example, the inner edge portions of the plate-like portions themselves may be positioned close to the shaft portion of the valve body and used as a slide guide inside the valve body. In this case, both side edges of the outer edge and inner edge of the plate-like portion form base-side guide portions.

[0049] Furthermore, in this embodiment, the valve body side guide portion 50 is a recess extending in the valve axis direction, and the outer edge portion 35 of the plate-shaped portion 30 is an insertion portion that is inserted into the recessed valve body side guide portion 50, but the base side guide portion may also be a recess extending in the valve axis direction (for example, a recess may be formed on the outer edge portion of the wide wall portion), and the valve body side guide portion may be an insertion portion that is inserted into the recess.

[0050] Furthermore, the slide guide structure of the valve body in this embodiment is a concave-convex guide structure consisting of an insertion portion (which can be considered a convex portion) which is the outer edge portion of the plate-shaped portion and a concave portion on the inside of the peripheral wall portion, but the slide guide structure of the valve body may also be configured, for example, to consist of convex portions arranged close to each other, or a convex portion and a stepped portion, etc.

[0051] Furthermore, in this embodiment, eight plate-shaped portions 30 are arranged radially around the axis of the valve body 40, and four of them, which are provided with the regulating portion 24c, are used as slide guides, but the number of plate-shaped portions may be, for example, three to seven, or nine or more, and the number used as slide guides is not particularly limited.

[0052] Furthermore, the valve body side guide portion 50 has four axially extending recesses corresponding to the outer edge portions 35 of the four plate-shaped portions 30 used in the slide guide, but this can be changed as appropriate depending on the number of base side guide portions.

[0053] (Action and effect) The release valve 10 can be assembled, for example, as follows: The spring member 70 is disposed radially outward from the shaft portion 43 of the valve body 40, with the other end supported on the periphery of the circular hole 33a on the back side of the connecting portion 33 of the base member 20, and one end of the spring member 70 supported on the front side of the flange portion 62.

[0054] In this state, the substantially cross-shaped one end 44 of the shaft 43 is aligned with the multiple insertion holes 63 of the spring presser member 60, and the spring presser member 60 is pressed onto the shaft 43 to compress the spring member 70 while inserting the one end 44 of the shaft 43 through the insertion hole 63. Thereafter, by rotating the spring presser member 60 in a predetermined direction relative to the shaft 43, the one end 44 of the shaft 43 fits into each fitting recess 64, and the spring presser member 60 can be attached to the one end 44 of the shaft 43 in a rotation-restricted state and in a non-detachable state.

[0055] In this embodiment, the spring holding member 60 is attached to the shaft portion 43 in a state in which its rotation around the valve axis is restricted (rotation restricted state) and supports one end of the spring member 70, and a restricting portion 34c is provided on the inner edge portion 34 of the plate-shaped portion 30, midway in the valve axis direction, to restrict the spring holding member 60 in the axial direction (see Figures 6, 7, 10 to 12).

[0056] According to the above-described embodiment, by utilizing the inner edge portion 34 of the specified plate-shaped portion 30, the spring member 70 can be compressed while maintaining the posture of the spring member 70, thereby attaching the spring retainer member 60 to the shaft portion 43. Furthermore, when the valve body 40 is fully open as shown in Figures 11 and 12, the spring retainer member 60 abuts against the restricting portion 34c provided on the inner edge portion 34 of the plate-shaped portion 30, restricting its axial direction, and thereby preventing the spring member 70 from coming off.

[0057] Furthermore, the axial direction of the spring presser member 60 attached to the shaft portion 43 in a rotation-restricted state is restricted by the restricting portions 34c provided on the inner edge portion 34 of the predetermined plate-like portion 30, thereby enabling the miniaturization of the spring presser member 60. That is, the spring presser member 60 is attached to the shaft portion 43 in a rotation-restricted state and is restricted in the axial direction by abutting against the restricting portions 34c provided on the inner edge portion 34 of the predetermined plate-like portion 30 (here, the plurality of protrusions 65 abut against the corresponding restricting portions 34c). Therefore, it is only necessary for the spring presser member 60 to be provided with portions (here, the protrusions 65) that abut against the restricting portions 34c provided on the inner edge portion 34 of the plate-like portion 30, and the spring presser member 60 can be made smaller.

[0058] 10 shows a case where the pressure in the internal space R1 of the attached member 1 is below a predetermined value. In this case, the biasing force of the spring member 70 causes the seal lip 56 of the seal portion 55 of the valve body 40 to abut against the valve seat 23 of the base member 20, and the vent hole 24 is closed.

[0059] From this state, if gas is generated inside the case due to the power storage device, for example, when the power storage device supplies power to the drive source or electrical components, or due to the external or internal environment of the case housing the power storage device (for example, when a power storage device such as a lithium ion battery supplies power by driving a motor or the like, gas is generated by a chemical reaction in the electrolyte), the following operation will occur.

[0060] That is, when the pressure in the internal space R1 of the attached member 1 rises and exceeds the biasing force of the spring member 70, the valve body 40 resists the biasing force and slides in a direction away from the valve seat 23 while being guided by the outer edge portion 35 of the plate-shaped portion 30 and the valve body-side guide portion 50, and the seal lip 56 moves away from the valve seat 23. Then, as shown in Figures 11 and 12, the vent hole 24 of the base member 20 opens, and the internal space R1 of the attached member 1 and the external space R2 communicate with each other through this vent hole 24.

[0061] As a result, the gas in the internal space R1 of the workpiece 1 flows into the main body tubular portion 21 of the base member 20, passes through the gaps between the circumferentially adjacent plate-shaped portions 30, 30, and is exhausted through the ventilation hole 24 to the external space R2 of the workpiece 1 (see arrow L in Figure 11), thereby releasing (reducing) the pressure within the workpiece 1.

[0062] Then, by inserting the portion 35b located at the extension portion 32 of the outer edge portion 35 of the plate-shaped portion 30 into each valve body side guide portion 50 which is recessed, the sliding movement of the valve body 40 in the opening and closing direction of the ventilation hole 24 is guided along the valve axis direction, as shown in Figures 10 to 12.

[0063] That is, in this release valve 10, the outer edge portion 35 of the plate-shaped portion 30 and the valve body side guide portion 50 can guide the sliding movement of the valve body 40 in the opening and closing direction of the air vent 24 along the valve axis direction.

[0064] Furthermore, the inside of the peripheral wall portion 45 of the valve body 40 forms the valve body side guide portion 50, and this valve body side guide portion 50 guides the outer edge portion 35 of the plate-shaped portion 30, which forms the base side guide portion, so that the sliding structure of the valve body 40 can be provided closer to the radial outside of the valve body 40, making it difficult for the valve body 40 to tilt in the valve axis direction during the sliding movement of the valve body 40, stabilizing its posture and stabilizing the sliding movement (stroke movement) of the valve body 40.

[0065] In addition, in this embodiment, the valve body side guide portion 50 is a recess extending in the valve axis direction, and the base side guide portion (the outer edge portion 35 of the plate-shaped portion 30) is an insertion portion that is inserted into the valve body side guide portion 50, which is a recess.

[0066] According to the above-described embodiment, the base side guide portion, which forms the insertion portion, is inserted into the valve body side guide portion 50, which is formed as a recess, so that the two inner surfaces of the valve body side guide portion 50, which is formed as a recess, are positioned close to the outside of the two outer surfaces of the base side guide portion, thereby minimizing rattling between the recess and the insertion portion, improving the guiding performance of the valve body 40 by the two guide portions, and making the sliding movement of the valve body 40 more stable.

[0067] The same effect can be obtained when the base-side guide portion is a recess extending in the valve axis direction and the valve body-side guide portion is an insertion portion that is inserted into the recess.

[0068] Furthermore, in this embodiment, the base member 20 is formed with a plate-shaped portion 30 that extends along the valve axis direction and further toward the valve body opening direction than the valve seat 23, and the outer edge portion 35 of the plate-shaped portion 30 forms a base-side guide portion.

[0069] According to the above aspect, the plate-shaped portion 30 extends further in the valve body opening direction than the valve seat 23 inside (radially inside) the main body cylindrical portion 21, thereby ensuring a long guide distance for the sliding movement of the valve body 40 and making the sliding movement of the valve body 40 more stable.

[0070] Furthermore, as shown in Figure 12, since the plate-shaped portion 30 has the above-mentioned configuration, the shortest distance K between the inner peripheral edge P1 of the ventilation hole 24 on the valve seat 23 side and the other end P2 in the extension direction of the outer edge portion 35 of the plate-shaped portion 30 can be ensured to be as long as possible.Therefore, when the valve body 40 is fully open and is separated from the valve seat 23 to its maximum extent, the flow path R3 of the gas flowing out from the internal space R1 of the attached member 1 (see Figure 11; the flow path defined by the above-mentioned shortest distance L, the inner surface of the main body cylindrical portion 21, the inner surface of the connecting portion 33 of the base member 20, the outer periphery of the spring member 70, etc.) can be ensured to be larger than the flow path R4 of the comparative example described below (see Figure 13A) in which the upper end of the guide portion is at approximately the same height as the valve seat, and gas can be quickly discharged from the internal space R1 of the attached member 1. [Example]

[0071] The flow rate of the pressure relief valve was confirmed when the internal space of the attached member reached a predetermined pressure or higher.

[0072] (Example) Pressure relief valves of the examples were manufactured having the same shape as the pressure relief valves shown in FIGS.

[0073] (Comparative Example) 13A and 13B, a comparative pressure release valve 100 was manufactured. A base member 110 has an annular guide portion 111 formed in its radial center, and the inner periphery of a vent hole 112 and the guide portion 111 are connected by a plurality of ribs 113, and a plurality of gas circulation ports are formed on the outer periphery of the guide portion 111. The upper end of the guide portion 111 and the valve seat 114 are at approximately the same height.

[0074] The shaft portion 121 of the valve element 120 is slidably inserted into the guide portion 111, and the sliding movement of the valve element 120 is guided at the radial center of the valve element 120. The pressure release valve 100 of the comparative example does not have a base side guide portion like the pressure release valve of the embodiment, and also does not have a valve element side guide portion like the pressure release valve of the embodiment.

[0075] (Flow rate confirmation test) The pressure release valves 10, 100 of the above-described example and comparative example were attached to the attachment hole 3 of the attachment workpiece 1, and the pressure in the internal space R1 of the attachment workpiece 1 was increased, and the gas flow rate was measured. The results are shown in Figure 14. In Figure 14, the solid line represents the example, and the dashed line represents the comparative example. As shown in Figure 13A, when the valve disc 120 is fully open, with the valve disc 120 at its maximum distance from the valve seat 114, the gas flow path R4 is smaller than the flow path R3 in the pressure release valve 10 of the example (see Figure 11).

[0076] 14, the pressure release valve 100 of the comparative example had a flow rate of 2200 L / min at 30 kPa, while the pressure release valve 10 of the example had a flow rate of 5800 L / min at 30 kPa. In other words, it was confirmed that the pressure release valve 10 of the example could obtain a larger flow rate than the pressure release valve 100 of the comparative example.

[0077] It should be noted that the present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. [Explanation of symbols]

[0078] 1...Attached member, 10...Pressure release valve, 20...Base member, 21...Main body cylindrical portion, 23...Valve seat, 24...Ventilation port, 30...Plate-shaped portion, 34...Inner edge portion, 34c...Regulating portion, 35...Outer edge portion (base side guide portion), 38...Sealing member, 40...Valve body, 41...Valve body, 42...Ceiling portion, 43...Shaft portion, 45...Peripheral wall portion, 50...Valve body side guide portion, 55...Sealing portion, 60...Spring retaining member, 70...Spring member.

Claims

1. A pressure relief valve attached to a workpiece, a base member fixed to the mounting member and having a valve seat and a vent hole formed inside the valve seat; a valve body that is slidable relative to the base member and moves toward and away from the valve seat to open and close the vent port; a spring member that biases the valve body toward the valve seat, The base member is formed with a base-side guide portion extending in the valve axis direction, the valve body has a ceiling portion disposed opposite the vent port and a peripheral wall portion extending from the ceiling portion in the valve axis direction, a valve body side guide portion that guides the base side guide portion and guides the sliding movement of the valve body in the valve axis direction;

2. one of the base-side guide portion and the valve-body-side guide portion is a recess extending in the valve axis direction, 2. The pressure release valve according to claim 1, wherein the other of the base-side guide portion and the valve-body-side guide portion is an insertion portion that is inserted into the recess.

3. 3. The pressure release valve according to claim 1, wherein the base member has a plate-like portion extending along the valve axis direction and further toward the valve body opening direction than the valve seat, and the outer edge of the plate-like portion forms the base-side guide portion.

4. a spring presser member that is attached to the shaft portion in a state where rotation around the valve shaft is restricted and that supports one end of the spring member; 4. A pressure release valve according to claim 3, wherein a restricting portion is provided on the inner edge of said plate-like portion midway in the valve axial direction, for restricting the axial direction of said spring retainer member.

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