Pressure regulating valve

Abstract

Liquids escape through openings in the housings of pressure-regulating valves when the internal pressure of the liquids inside the housings increase. This pressure-regulating valve is equipped with: a cover section which covers an opening and includes a peripheral section for surrounding the opening when seen in a planar view; a sealing section which is positioned between the peripheral section of the cover section and the surface of the housing; an elastic member which produces biasing force in a first direction which biases the cover section toward the housing; and a base section which is secured to the housing and supports the elastic member in a manner such that the elastic member expands and contracts in the first direction.

Description

Technical Field

[0001] The present invention relates to a pressure regulating valve for adjusting the pressure inside a housing.

Background Art

[0002] A pressure regulating valve is a device for adjusting the pressure inside a housing. The housing is, for example, a battery pack mounted on an automobile. Inside the battery pack, devices such as battery cells are housed and sealed. The pressure regulating valve is attached to a housing such as a battery pack. For example, the pressure regulating valve is arranged to cover an opening formed in the housing. When the pressure inside the housing exceeds a threshold value, the pressure regulating valve operates to release the fluid inside the housing to the outside. The pressure regulating valve can prevent the devices inside the housing from being damaged due to an increase in pressure. [[ID=1 4]]

[0003] Some pressure regulating valves have been proposed. For example, Patent Document 1 discloses a pressure regulating valve including a base portion attached to an opening of a housing and a cover portion covering the base portion. An urging force toward the base portion is applied to the cover portion. When the internal pressure exceeds a threshold value, the cover portion moves in a direction away from the base portion. The fluid inside the housing is discharged to the outside through the gap between the base portion and the cover portion and the gap between the cover portion and the housing. For example, Patent Document 2 discloses a pressure regulating valve including a valve covering an opening of a housing and a lid covering the valve. When the internal pressure exceeds a threshold value, the valve moves in a direction away from the housing. The fluid inside the housing is discharged to the outside through the gap between the valve and the housing and the gap between the lid and the housing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] In the pressure regulating valve described in Patent Document 1, the fluid flow is restricted by the gap between the base and the cover, and the gap between the cover and the housing. In the pressure regulating valve described in Patent Document 2, the fluid flow is restricted by the gap between the valve and the housing, and the gap between the lid and the housing.

[0006] The present invention aims to provide a pressure regulating valve that can solve these problems. [Means for solving the problem]

[0007] The present invention relates to a fluid pressure regulating valve that releases fluid from an opening in a housing when the internal pressure of the fluid inside the housing rises, A cover portion that covers the opening, including a peripheral edge portion that surrounds the opening in a plan view, A sealing portion located between the peripheral edge of the cover portion and the surface of the housing, An elastic member that generates a biasing force in a first direction that biases the cover portion toward the housing, A pressure regulating valve comprising: a base portion fixed to the housing and supporting the elastic member such that the elastic member expands and contracts in a first direction.

[0008] In the pressure regulating valve according to the present invention, the cover portion may include a cover body and a shaft connected to the cover body and extending toward the opening of the housing, and the base portion may include a housing that engages with the shaft and a plurality of legs connected to the housing, extending outward from the housing in a plan view and fastened to the surface of the housing.

[0009] In the pressure regulating valve according to the present invention, the end of the leg portion may be fastened to a projection that protrudes inward from the outer edge of the opening of the housing.

[0010] In the pressure regulating valve according to the present invention, the peripheral edge of the cover portion may be close to the opening of the housing.

[0011] In the pressure regulating valve according to the present invention, the cover portion may include an end lock connected to the shaft, and the elastic member may include an upper end of the base portion that contacts the housing and a lower end of the cover portion that contacts the end lock.

[0012] In the pressure regulating valve according to the present invention, the base portion may include a metal bracket comprising at least a portion of the base portion that supports the elastic member and a portion of the base portion that is fixed to the surface of the housing, and a resin layer in contact with the metal bracket.

[0013] The present invention relates to a fluid pressure regulating valve that releases fluid from an opening in a housing when the internal pressure of the fluid inside the housing rises, A case fixed to the surface of the housing, which includes a discharge hole communicating with the aforementioned opening, In a plan view, the cover portion includes a peripheral edge surrounding the discharge hole and covers the discharge hole, A sealing portion located between the peripheral edge of the cover portion and the surface of the case, The system includes an elastic member that generates a biasing force in a first direction that biases the cover portion toward the housing, The case is a pressure regulating valve that supports the elastic member such that the elastic member expands and contracts in the first direction.

[0014] In the pressure regulating valve according to the present invention, the case may include a metal bracket comprising at least a portion of the case that supports the elastic member and a portion of the case that is fixed to the surface of the housing, and a resin layer in contact with the metal bracket. [Effects of the Invention]

[0015] According to the present invention, the flow rate of the fluid discharged to the outside can be increased. [Brief explanation of the drawing]

[0016] [Figure 1] It is a partial cross-sectional view showing a pressure regulating valve attached to a housing. [Figure 2] It is an exploded view showing the pressure regulating valve. [Figure 3] It is a side view showing the pressure regulating valve. [Figure 4] It is a longitudinal cross-sectional view showing the pressure regulating valve. [Figure 5] It is a bottom view showing the case when viewed from the back side. [Figure 6] It is a bottom view showing the pressure regulating valve attached to the housing when viewed from the back side. [Figure 7] It is a longitudinal cross-sectional view showing the pressure regulating valve and the housing in the closed state. [Figure 8] It is a longitudinal cross-sectional view showing the pressure regulating valve and the housing in the open state. [Figure 9] It is a longitudinal cross-sectional view showing the pressure regulating valve according to the first modification. [Figure 10] It is a longitudinal cross-sectional view showing the pressure regulating valve according to the first modification. [Figure 11] It is a partial cross-sectional view showing the pressure regulating valve according to the second modification. [Figure 12] It is a partial cross-sectional view showing the pressure regulating valve according to the second modification.

Mode for Carrying Out the Invention

[0017] Embodiments of the present invention will be described with reference to the drawings. In the drawings attached to this specification, for the convenience of easy understanding, the scale, the aspect ratio of the vertical and horizontal dimensions, etc. are appropriately changed and exaggerated from those of the actual object.

[0018] Figure 1 is a partial cross-sectional view showing an example of a pressure regulating valve 10. The pressure regulating valve 10 is mounted on a housing 100. The housing 100 is, for example, a battery pack mounted in an automobile. Inside the battery pack are devices such as battery cells, which are sealed. The housing 100 includes a front surface 101 and a back surface 102. The front surface 101 is in contact with the external atmosphere of the housing 100. The back surface 102 is in contact with the internal space sealed by the housing 100. The housing 100 includes an opening 103 that penetrates the housing 100. The pressure regulating valve 10 is mounted on the housing 100 so as to cover the opening 103.

[0019] The pressure regulating valve 10 operates to release fluids such as gas from inside the housing 100 to the outside when the internal pressure of the housing 100 exceeds a threshold. The internal pressure of the housing 100 is also called the internal pressure.

[0020] The pressure regulating valve 10 will now be described in detail. Figure 2 is an exploded view showing the pressure regulating valve 10. The pressure regulating valve 10 comprises a cover portion 20, a seal portion 30, an elastic member 40, and a base portion 50. By assembling the cover portion 20, the seal portion 30, the elastic member 40, and the base portion 50, a modularized pressure regulating valve 10 is obtained. The pressure regulating valve 10 is mounted on the housing 100 in its modularized state.

[0021] Each component of the pressure regulating valve 10 will be described in detail with reference to Figures 1 to 4. Figure 3 is a side view of the pressure regulating valve 10. Figure 4 is a longitudinal cross-sectional view of the pressure regulating valve 10.

[0022] (Cover section) The cover portion 20 includes a peripheral edge portion 20e that surrounds the opening 103 of the housing 100 in a plan view. The cover portion 20 can move in a first direction D1 in accordance with the internal pressure. The first direction D1 is the direction normal to the surface 101 of the housing 100.

[0023] The cover portion 20 includes a cover body 21 and a shaft 22. The cover body 21 includes an upper portion 211 that covers the opening 103 of the housing 100 in a plan view, and a side portion 212 that extends from the upper portion 211 toward the housing 100. A plan view means viewing the object along the direction normal to the surface 101 of the housing 100. The upper portion 211 may have a circular shape in a plan view. The side portion 212 may have a cylindrical shape.

[0024] The shaft 22 is connected to the cover body 21. For example, the shaft 22 is connected to the center of the cover body 21 in a plan view. The shaft 22 extends linearly from the cover body 21 toward the opening 103.

[0025] The cover portion 20 may include a flange 23. The flange 23 is connected, for example, to a side portion 212 of the cover body 21. The flange 23 includes a first portion 231 that extends outward from the side portion 212. When the pressure regulating valve 10 is in the closed position, the first portion 231 presses the sealing portion 30 toward the surface 101 of the housing 100. "Outward" means the direction away from the center of the opening 103 in the planar direction of the surface 101 of the housing 100. "Inward," as described later, means the direction toward the center of the opening 103 in the planar direction of the surface 101 of the housing 100.

[0026] The flange 23 may include a second portion 232 that extends from the first portion 231 toward the housing 100. In this case, the first portion 231 and the second portion 232 of the flange 23, and the side portion 212 of the cover body 21 constitute a peripheral portion 20e surrounding the opening 103 of the housing 100. In the peripheral portion 20e, the space enclosed by the first portion 231 and the second portion 232 and the side portion 212 of the cover body 21 may define a groove 24 in which the seal portion 30 is housed.

[0027] The cover portion 20 may include an end lock 25. The end lock 25 is connected to the shaft 22. The end lock 25 includes, for example, a side portion 251 and a lower portion 252 connected to a lower portion 252, which is located below the shaft 22. The side portion 251 surrounds the shaft 22 in a plan view. The side portion 251 may be fixed to the shaft 22. "Downward" means the direction from the cover portion 20 toward the surface 101 in the first direction D1. "Upward," as described later, means the direction from the surface 101 toward the cover portion 20 in the first direction D1.

[0028] (Seal part) The sealing portion 30 is located between the peripheral edge 20e of the cover portion 20 and the surface 101 of the housing 100. In the closed state, when the pressure regulating valve 10 is closed, the sealing portion 30 is in contact with the surface 101 of the housing 100. The sealing portion 30 is, for example, a gasket. As shown in Figure 4, the sealing portion 30 may protrude downward from the groove 24.

[0029] (Elastic material) The elastic member 40 biases the cover portion 20 toward the housing 100 in the first direction D1. The elastic member 40 expands and contracts in the first direction D1 in accordance with the movement of the cover portion 20 in the first direction D1. The elastic member 40 is, for example, a spring. As will be described later, the elastic member 40 in the open state, when the pressure regulating valve 10 is open, is more contracted than the elastic member 40 in the closed state.

[0030] The elastic member 40 includes an upper end 41 and a lower end 42. As shown in Figure 4, the upper end 41 is in contact with the base portion 50. The lower end 42 is in contact with the lower part 252 of the end lock 25 of the cover portion 20. The shaft 22 of the cover portion 20 is inserted inside the elastic member 40.

[0031] (Base section) The base portion 50 is fixed to the housing 100. As shown in Figure 2, the base portion 50 may include a housing 51, legs 52 and fastening portions 53.

[0032] The housing 51 includes an upper portion 511 that overlaps the opening 103 of the housing 100 in a plan view, and a side portion 512 that extends downward from the upper portion 511. The upper portion 511 may have a circular shape in a plan view. The upper end of the elastic member 40 described above is in contact with the upper portion 511. The side portion 512 may have a cylindrical shape. As shown in Figure 4, when the pressure regulating valve 10 is in the closed state, the shaft 22 and end lock 25 of the cover portion 20 and the elastic member 40 may be located in the space inside the side portion 512.

[0033] As shown in Figures 2 and 4, an engaging portion 54 may be formed on the upper part 511 of the housing 51. The engaging portion 54 engages with the shaft 22 of the cover portion 20. The engaging portion 54 is, for example, a hole into which the shaft 22 is inserted.

[0034] The legs 52 are connected to the sides 512 of the housing 51, as shown in Figure 2. The legs 52 extend outward from the housing 51 in a plan view. The legs 52 include ends that overlap the surface 101 of the housing 100 in a plan view. The base 50 may include a plurality of legs 52. For example, the base 50 may include three legs 52. The plurality of legs 52 may be arranged at equal intervals along the circumferential direction of the housing 51.

[0035] A fastening portion 53 may be formed on the leg portion 52. The fastening portion 53 is the part of the base portion 50 that is fastened to the housing 100. The fastening portion 53 is, for example, a hole into which a fastener 55, as shown in Figure 2, is inserted. The fastener 55 is, for example, a bolt. The base portion 50 is fixed to the housing 100 by inserting the fastener 55 into the fastening portion 53 of the base portion 50 and the fastening hole of the housing 100 (described later), and fixing the fastener 55 with a nut (not shown).

[0036] Next, the positional relationship between the housing 100 and the base 50 will be explained. Figure 5 is a bottom view showing the housing 100 as seen from the back surface 102 side, with the pressure regulating valve 10 not yet installed. Figure 6 is a bottom view showing the pressure regulating valve 10 installed on the housing 100 as seen from the back surface 102 side.

[0037] As shown in Figure 5, the opening 103 of the housing 100 may have a substantially circular outer edge in plan view. Reference numeral 103e denotes the envelope of the opening 103. The envelope 103e is composed of a circular line that encloses the outer edge of the opening 103 in plan view.

[0038] The housing 100 may include a plurality of protrusions 104 that are in contact with the opening 103 and project outward from the envelope circle 103e toward the center of the opening 103. For example, the housing 100 may include three protrusions 104. The plurality of protrusions 104 may be arranged at equal intervals along the circumferential direction of the envelope circle 103e. The protrusions 104 have fastening holes 105 into which fasteners 55 are inserted. The fastening holes 105 are located inside the envelope circle 103e, as shown in Figure 5.

[0039] The opening 103 preferably has a lower protrusion ratio. The protrusion ratio is the ratio of the total length of the portion of the envelope 103e that overlaps with the protrusion 104 to the total length of the envelope 103e. As shown in Figure 6, the legs 52 of the base portion 50 overlap the protrusion 104. The lower the protrusion ratio, the greater the fluid flow path that can reach the outside without being obstructed by the base portion 50. Therefore, the lower the protrusion ratio, the higher the flow rate of fluid discharged to the outside can be. The protrusion ratio is, for example, 0.5 or more, may be 0.6 or more, or may be 0.7 or more. The protrusion ratio is, for example, 0.9 or less.

[0040] As shown in Figure 6, the base portion 50 is fixed to the housing 100 in such a way that it does not completely cover the opening 103. The base portion 50 preferably has a lower cover ratio. The cover ratio is the ratio of the area of ​​the portion of the base portion 50 that overlaps the opening 103 to the area of ​​the opening 103. The cover ratio is, for example, 0.8 or less, may be 0.7 or less, or 0.6 or less. The cover ratio is, for example, 0.2 or more.

[0041] Next, the operation of the pressure regulating valve 10 will be explained. Figure 7 is a longitudinal cross-sectional view showing the pressure regulating valve and housing in the closed state. The elastic member 40 generates a biasing force that biases the cover portion 20 toward the housing 100. For example, the elastic member 40 is in a compressed state. Therefore, a restoring force is generated in the elastic member 40. The elastic member 40 pushes the side portion 251 of the end lock 25 of the cover portion 20 downward, thereby biasing the cover portion 20 downward. As a result, the seal portion 30 attached to the peripheral edge portion 20e of the cover portion 20 comes into contact with the surface 101 of the housing 100. This seals the space inside the housing 100.

[0042] As shown in Figure 7, the peripheral edge 20e of the cover portion 20 may be close to the opening 103 of the housing 100. The shortest distance between the inner surface of the side portion 212 constituting the peripheral edge 20e and the outer edge of the opening 103 is, for example, 10 mm or less, but may also be 5 mm or less, 2 mm or less, or 1 mm or less. This allows the fluid inside the housing 100 to be smoothly discharged to the outside when it is in the open state, as will be described later.

[0043] Figure 8 is a longitudinal cross-sectional view showing the pressure regulating valve and housing in the open state. When the internal pressure of the housing 100 exceeds a predetermined threshold, the force exerted by the internal pressure on the cover portion 20 becomes greater than the force exerted by the elastic member 40 on the cover portion 20. As a result, the cover portion 20 moves upward. The cover portion 20 moves upward until the force exerted by the internal pressure on the cover portion 20 and the force exerted by the elastic member 40 on the cover portion 20 are balanced. In the open state, the elastic member 40 is more compressed than it is in the closed state.

[0044] As the cover portion 20 moves upward, a gap is created between the peripheral edge 20e of the cover portion 20 and the surface 101 of the housing 100. As described above, the peripheral edge 20e is close to the opening 103. Also, the opening 103 is not completely covered by the base portion 50. Therefore, the fluid inside the housing 100 can smoothly reach the outside of the pressure regulating valve 10 through the gap between the peripheral edge 20e and the surface 101. In other words, the flow rate of the fluid released to the outside can be increased.

[0045] As the fluid is released to the outside, the internal pressure decreases. When the force exerted by the internal pressure on the cover portion 20 becomes less than the force exerted by the elastic member 40 on the cover portion 20, the restoring force of the elastic member 40 causes the cover portion 20 to move downward, and the pressure regulating valve 10 returns to the closed state.

[0046] It is possible to make various modifications to the embodiments described above. The following descriptions of modifications will be made with reference to the drawings as needed. In the following descriptions and the drawings used therein, parts that can be configured similarly to the embodiments described above will be given the same reference numerals as those used for the corresponding parts in the embodiments described above, and redundant explanations will be omitted. Furthermore, if it is clear that the effects and advantages obtained in the embodiments described above can also be obtained in the modifications, the explanation may be omitted.

[0047] (First variation) Figures 9 and 10 are longitudinal cross-sectional views showing a pressure regulating valve 10 according to the first modified example. Figure 9 shows the pressure regulating valve 10 in the closed state. Figure 10 shows the pressure regulating valve 10 in the open state.

[0048] In the above-described embodiment, an example was shown in which the elastic member 40 is positioned so as to overlap the opening 103 of the housing 100 in a plan view. However, as shown in Figures 9 and 10, the elastic member 40 may be positioned outside the opening 103. In this case, the cover portion 20 is connected to the cover body 21 and includes a plurality of first pressing portions 26 located outside the opening 103. The first pressing portions 26 are in contact with the lower end 42 of the elastic member 40. The biasing force of the elastic member 40 is transmitted to the cover body 21 via the first pressing portions 26. The base portion 50 also includes a plurality of second pressing portions 56 that are in contact with the upper end 41 of the elastic member 40 outside the opening 103. The second pressing portions 56 are connected to fastening portions 53 that are fastened to the housing 100.

[0049] The multiple first pressing portions 26 and the multiple second pressing portions 56 are arranged at equal intervals along the circumferential direction of the opening 103, similar to the leg portions 52 described above. In other words, the cover portion 20 includes gap portions where the first pressing portions 26 are not formed, and the base portion 50 also includes gap portions where the second pressing portions 56 are not formed. When the pressure regulating valve 10 is open, the fluid inside the housing 100 is discharged to the outside through the gap portions of the cover portion 20 and the base portion 50, as well as the gap between the cover portion 20 and the housing 100. In this modified example, as in the embodiment described above, the fluid can smoothly reach the gap between the cover portion 20 and the housing 100. Therefore, the flow rate of the fluid discharged to the outside can be increased.

[0050] (Second variation) In the embodiments and modifications described above, an example was shown in which the cover portion 20 covers the opening 103 of the housing 100. In this modification, an example is described in which the base portion fixed to the surface 101 of the housing 100 includes a discharge hole communicating with the opening 103 of the housing 100, and the cover portion 20 covers the discharge hole of the base portion. In this modification, the base portion including the discharge hole communicating with the opening 103 of the housing 100 is referred to as the case.

[0051] Figure 11 is a partial cross-sectional view showing a pressure regulating valve 10 according to this modified example. The pressure regulating valve 10 comprises a cover portion 20, a seal portion 30, an elastic member 40, and a case 60. The case 60 is fixed to the housing 100. The housing 100 includes a plurality of fastening holes 105 for fixing the case 60 to the housing 100. The fastening holes 105 are located outside the envelope 103e of the opening 103.

[0052] Case 60 will be described in detail with reference to Figure 12. Case 60 may include a housing 61, legs 62, fastening parts 63 and engaging parts 64. The housing 61, legs 62, fastening parts 63 and engaging parts 64 are components corresponding to the housing 51, legs 52, fastening parts 53 and engaging parts 54 of the base part 50. Case 60 may further include a plurality of outer frame parts 67 and a plurality of discharge holes 68.

[0053] The housing 61, like the housing 51, supports the elastic member 40 so that it expands and contracts in a first direction D1. For example, the housing 61, like the housing 51, includes an upper part 611 and a side part 612. The upper end of the elastic member 40 is in contact with the upper part 611. An engaging part 64 into which the shaft 22 of the cover part 20 is inserted is formed on the upper part 611 of the housing 61, similar to the engaging part 54.

[0054] The leg portion 62, like the leg portion 52, extends outward from the housing 61 in a plan view. The leg portion 62 includes an end that overlaps the surface 101 of the housing 100 in a plan view. Similar to the leg portion 52, a fastening portion 63 is formed at the end of the leg portion 62. The fastening portion 63 is, for example, a hole into which a fastener is inserted. The case 60 is fixed to the housing 100 by inserting the fastener into the fastening portion 63 of the case 60 and the fastening hole 105 of the housing 100 and securing the fastener with a nut or the like.

[0055] Each of the multiple outer frame sections 67 is connected to two adjacent legs 52 of the pressure regulating valve 10 in the circumferential direction. The two adjacent legs 52 are also referred to as the first leg 52 and the second leg 52. One outer frame section 67 extends along the circumferential direction of the pressure regulating valve 10 from the end of the first leg 52 to the end of the second leg 52. The combination of the multiple outer frame sections 67 surrounds the opening 103 of the housing 100 in a plan view.

[0056] The discharge hole 68 is, in a plan view, the area enclosed by the housing 61, the leg portion 62, and the outer frame portion 67. The discharge hole 68 overlaps, at least partially, with the opening 103 of the housing 100.

[0057] As shown in Figure 12, a groove 67a for housing the seal portion 30 may be formed on the upper surface of the outer frame portion 67. When the pressure regulating valve 10 is in the closed state, the seal portion 30 is in contact with the case 60 and the cover portion 20.

[0058] The operation of the pressure regulating valve 10 will now be explained. The cover portion 20 includes a peripheral edge that surrounds the multiple discharge holes 68 of the case 60 in a plan view. When the pressure regulating valve 10 is in the closed state, the elastic member 40 generates a biasing force that biases the cover portion 20 toward the housing 100. As a result, the peripheral edge of the cover portion 20 comes into contact with the seal portion 30 attached to the outer frame portion 67 of the case 60. This closes the discharge holes 68 of the case 60.

[0059] When the internal pressure of the housing 100 exceeds a predetermined threshold, the force exerted by the internal pressure on the cover portion 20 becomes greater than the force exerted by the elastic member 40 on the cover portion 20. As a result, the cover portion 20 moves upward. The cover portion 20 continues to move upward until the force exerted by the internal pressure on the cover portion 20 and the force exerted by the elastic member 40 on the cover portion 20 are balanced. This results in an open state in which the opening 103 and the discharge hole 68 are opened. In the open state, the elastic member 40 is more compressed than it is in the closed state.

[0060] As the cover portion 20 moves upward, a gap is created between the peripheral edge of the cover portion 20 and the outer frame portion 67 of the case 60. As described above, the discharge hole 68 of the case 60 overlaps with the opening 103 of the housing 100. That is, the discharge hole 68 is in communication with the opening 103. The fluid inside the housing 100 passes through the opening 103 of the housing 100 and the discharge hole 68 of the case 60, and is then discharged to the outside through the gap between the case 60 and the cover portion 20.

[0061] As the fluid is released to the outside, the internal pressure decreases. When the force exerted by the internal pressure on the cover portion 20 becomes less than the force exerted by the elastic member 40 on the cover portion 20, the restoring force of the elastic member 40 causes the cover portion 20 to move downward, and the pressure regulating valve 10 returns to the closed state.

[0062] (Third variation) An example of the structure of the cover portion 20 will be described. As shown in Figure 12, the cover portion 20 may include a protective wall 27 that extends from the center of the lower surface of the upper part 211 of the cover body 21 toward the housing 100. The protective wall 27 is located outside the housing 61 of the case 60 when the pressure regulating valve 10 is in the closed position. The protective wall 27 may have a cylindrical shape that covers the housing 61 radially around the pressure regulating valve 10. The protective wall 27 protects the housing 61 and the shaft 22. For example, the protective wall 27 prevents the housing 61 and the shaft 22 from being exposed to hot air in the event of a fire inside the housing 100. By protecting the housing 61 and the shaft 22, it is possible to prevent the opening and closing function of the cover portion 20 from being impaired.

[0063] Although not shown in the figures, the cover portion 20 may also include a protective wall 27 in the above-described embodiment. For example, in the embodiment shown in Figures 1 to 8, the cover portion 20 may include a protective wall 27 located on the outside of the housing 51 of the base portion 50.

[0064] (Fourth variation) An example of the configuration of case 60 will be described. As shown in Figure 12, case 60 may include a metal bracket 60A and a resin layer 60B. The metal bracket 60A is a component made by bending a metal plate. The metal bracket 60A includes a bent portion formed by bending the metal plate. The resin layer 60B is in contact with the metal bracket 60A.

[0065] The case 60, including the metal bracket 60A and the resin layer 60B, is manufactured, for example, by insert molding. Insert molding includes, for example, the steps of placing the metal bracket 60A between a first mold and a second mold, and injecting resin between the first mold and the second mold.

[0066] The metal bracket 60A preferably comprises at least a portion of the case 60 that supports the elastic member 40 and a portion of the case 60 that is fixed to the surface 101 of the housing 100. For example, the metal bracket 60A is preferably located on the housing 61 and the leg portion 62. For example, the metal bracket 60A, which is made of a single metal plate, extends over the housing 61 and the leg portion 62. In addition to the housing 61 and the leg portion 62, the metal bracket 60A may also be located on the outer frame portion 67. For example, the metal bracket 60A, which is made of a single metal plate, may extend over the housing 61, the leg portion 62 and the outer frame portion 67.

[0067] By using the metal bracket 60A, the heat resistance of the case 60 can be increased. For example, if a fire occurs inside the housing 100, the housing 61 will not fall off. This prevents the opening and closing function of the cover 20 from being impaired. Therefore, after the cover 20 opens due to a fire, explosion, etc., the cover 20 can return to the closed state. When the cover 20 returns to the closed state, the supply of oxygen from the outside to the inside of the housing 100 is cut off. Therefore, a second fire, explosion, etc. can be prevented.

[0068] Although not shown in the figures, in the above-described embodiment, the base portion 50, which is a component corresponding to the case 60, may also include a metal bracket and a resin layer. For example, in the embodiment shown in Figures 1 to 8, the metal bracket may comprise at least a portion of the base portion 50 that supports the elastic member 40 and a portion of the base portion 50 that is fixed to the surface 101 of the housing 100. For example, the metal bracket is preferably located on the housing 51 and the leg portion 52. For example, a metal bracket made of a single metal plate extends over the housing 51 and the leg portion 52.

[0069] (Other variations) Multiple variations may be combined with the above-described embodiments. Multiple variations may be combined with each other. [Explanation of Symbols]

[0070] 10 Pressure Regulating Valve 20 Cover section 21 Cover body 22 axes 23 Flange 24 groove 25 Endlock 27 Barrier 30 Seal part 40 Elastic members 50 Base section 51 Housing 52 Legs 55 Fasteners 60 cases 60A Metal Bracket 60B resin layer 61 Housing 62 Legs 63 Fastening part 64 Engaging part 67 Outer frame 68 Discharge hole 100 cabinets 101 Surface 102 Back side 103 Opening 104 Projection 105 Fastening hole

Claims

1. A pressure regulating valve that releases fluid from an opening in the housing when the internal pressure of the fluid inside the housing rises, A cover portion that covers the opening, including a peripheral edge portion that surrounds the opening in a plan view, A sealing portion located between the peripheral edge of the cover portion and the surface of the housing, An elastic member that generates a biasing force in a first direction that biases the cover portion toward the housing, The housing is fixed to the base portion which supports the elastic member so that the elastic member expands and contracts in a first direction, A pressure regulating valve in which, when the opening is covered by the cover portion, the sealing portion is in contact with the surface of the housing.

2. The cover portion includes a cover body and a shaft connected to the cover body and extending toward the opening of the housing. The pressure regulating valve according to claim 1, wherein the base portion includes a housing that engages with the shaft, and a plurality of legs connected to the housing, extending outward from the housing in a plan view, and fastened to the surface of the housing.

3. The end of the leg portion is fastened to a projection that protrudes inward from the outer edge of the opening of the housing, as described in claim 2.

4. The pressure regulating valve according to any one of claims 1 to 3, wherein the peripheral edge of the cover portion is close to the opening of the housing.

5. The cover portion includes an end lock connected to the shaft, The pressure regulating valve according to claim 2 or 3, wherein the elastic member includes an upper end of the base portion that contacts the housing and a lower end of the cover portion that contacts the end lock.

6. The pressure regulating valve according to any one of claims 1 to 3, wherein the base portion includes a metal bracket comprising at least a portion of the base portion that supports the elastic member and a portion of the base portion that is fixed to the surface of the housing, and a resin layer in contact with the metal bracket.

7. A pressure regulating valve that releases fluid from an opening in the housing when the internal pressure of the fluid inside the housing rises, A case fixed to the surface of the housing, which includes a plurality of discharge holes communicating with the aforementioned opening, A cover portion including a cover body that covers the discharge hole and includes a peripheral edge surrounding the discharge hole in a plan view, and a shaft connected to the cover body and extending toward the opening, A sealing portion located between the peripheral edge of the cover portion and the surface of the case, The system includes an elastic member that generates a biasing force in a first direction that biases the cover portion toward the housing, The shaft of the cover portion is inserted inside the elastic member. The case includes a housing that supports the elastic member so that the elastic member expands and contracts in a first direction, and a plurality of discharge holes located on the outside of the housing in a plan view, The housing of the case includes an upper part in which an engaging portion is formed into which the shaft of the cover portion is inserted, and a side portion that extends downward from the upper part, The shaft of the cover portion is located in the space inside the side portion of the housing of the case, The peripheral edge of the cover body of the cover portion contacts the sealing portion when the discharge hole is covered by the cover portion and includes a lower surface that extends flat to the outer edge of the cover body of the cover portion. A pressure regulating valve in which, when the discharge hole is open, the fluid inside the housing is discharged to the outside through the gap between the surface of the case and the lower surface of the peripheral edge of the cover body of the cover portion.

8. The pressure regulating valve according to claim 7, wherein the case includes a metal bracket comprising at least a portion of the case that supports the elastic member and a portion of the case that is fixed to the surface of the housing, and a resin layer in contact with the metal bracket.

9. The case includes a plurality of legs extending outward from the housing in a plan view, and a plurality of outer frame portions connected to two adjacent legs in the circumferential direction of the pressure regulating valve, The multiple discharge holes are regions enclosed by the housing, the legs, and the outer frame in a plan view. The pressure regulating valve according to claim 7 or 8, wherein the plurality of legs of the housing are connected to the side of the housing.

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