JP4078519B2 - Pressure release valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is, for example, a pressure plate provided on a sealing plate of a pressure vessel in an electric or electronic component such as a battery (including a primary battery and a secondary battery), a fuel cell, a capacitor, and a capacitor, or a sealing plate of a pressure vessel of a general device. It relates to an open valve.
[0002]
[Prior art]
In a sealed aluminum electrolytic capacitor, an electric double layer capacitor, or the like, the opening of a pressure vessel that houses the element body is closed by a sealing plate that is sealed via a gasket. If such a completely sealed structure is used, when a sudden load is applied, the internal pressure of the container increases due to Joule heat generation, which may cause a decrease in the function and lifetime of the capacitor. For this reason, conventionally, by applying a water-repellent treatment to the sealing plate, for example, a porous film made of PTFE or the like, a breather that allows gas to permeate but impermeable to liquid is attached, and the pressure generated inside the container is reduced. Things that can be opened have been developed.
[0003]
[Problems to be solved by the invention]
According to the prior art, the breather provided on the sealing plate has a function of keeping the internal pressure of the pressure vessel constant and preventing leakage of the encapsulated liquid such as an electrolyte, but occurs in a normal use state. Even under heat and internal pressure, the gas in the container is slightly released from the breather, so that the electrolytic solution is likely to decrease due to evaporation, and water vapor from outside tends to enter. Further, in a poor environment, the breather porous membrane may be clogged, making it difficult to expect stable performance.
[0004]
The present invention has been made in view of the above points, and its technical problem is to prevent the evaporation of the encapsulated liquid and the entry of foreign matter from the outside, and the pressure that can reliably perform the pressure release function when the internal pressure increases. It is to provide an open valve.
[0005]
[Means for Solving the Problems]
As a means for effectively solving the above technical problem, the pressure release valve according to the invention of claim 1 is a plane in which a valve hole is opened in an inner periphery of a sealing plate sealed to an opening of a pressure vessel. And a valve mounting recess that extends from the outer periphery of the valve seat toward the outside of the sealing plate and has a valve body disposed on the inner periphery thereof. The valve body is locked to the valve mounting recess. And a sealing lip provided integrally with the fixing plate and opened in a tapered shape. In the normal state, the tip lip portion is in close contact with the valve seat, and the tip lip portion Of the pressure vessel acting on the tapered pressure receiving surface of the inner circumference The valve opening force due to the internal pressure is greater than the valve closing force due to the elasticity of the seal lip. Thus, a valve opening operation is performed, and an air passage is formed between the valve mounting recess and the fixing plate. That is, this pressure release valve is closed in a normal state where the internal pressure acting on the tapered pressure receiving surface of the seal lip through the valve hole is equal to or less than a predetermined value, and the internal pressure exceeds the predetermined value. As a result of the rise, the valve opening force due to the internal pressure becomes larger than the valve closing force due to the elasticity of the seal lip. In this case, the seal lip opens to move away from the valve seat, and the internal pressure is released to the atmosphere through the air passage.
[0006]
According to a second aspect of the present invention, there is provided the pressure relief valve according to the first aspect, wherein the stationary plate is locked to the valve mounting recess by a leaf spring portion formed on an outer peripheral portion thereof, and the leaf spring portion is The outer peripheral edge locked by the mounting recess is bent so as to face the outside of the valve body, and the air passage is composed of a number of slits formed in the leaf spring portion. In other words, the pressure release valve is fixed in a retaining state by press-fitting the leaf spring portion of the fixed plate into the valve mounting recess, and when the seal lip is opened, the internal pressure of the pressure vessel is passed through the slit of the leaf spring portion. To open the atmosphere.
[0007]
According to a third aspect of the present invention, there is provided the pressure relief valve according to the first aspect, wherein the fixing plate is fitted into the valve mounting recess by an annular elastic body integrally formed with a rubber-like elastic material on the outer peripheral portion thereof. The ventilation path comprises a required number of grooves formed in the annular elastic body. That is, this pressure release valve is fixed by the tightening margin of the annular elastic body so that the internal pressure of the sealing lip is not easily released by the tightening margin of the annular elastic body. The internal pressure of the pressure vessel is released to the atmosphere through the groove of the annular elastic body.
[0008]
According to a fourth aspect of the present invention, there is provided the pressure release valve according to any one of the first to third aspects, wherein the fixed plate is brought into close contact with the sealing plate outside the air passage and at a predetermined internal pressure on the air passage side. A second seal lip that opens is provided. That is, this pressure release valve functions as a dust seal in which the second seal lip prevents entry of foreign matter from the air passage.
[0009]
According to a fifth aspect of the present invention, there is provided the pressure relief valve according to any one of the first to fourth aspects, wherein the fixing plate has a hole closed with a rubber film, and the rubber film has a seal lip opened. It is broken at a predetermined pressure value that is higher than the pressure value at the time of being valved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1A and 1B show a schematic structure of a sealed electrolytic capacitor or an electrolyte battery to which a pressure relief valve according to the present invention is applied, in which FIG. 1A is a longitudinal sectional view and FIG. 1B is a plan view. That is, a capacitor or battery body element 2 is accommodated in a bottomed cylindrical case 1 which is a pressure vessel made of a metal such as aluminum, and the upper end opening of the case 1 has an electrically insulating synthetic resin material. And is closed by a sealing plate 3 formed into a disk shape. The main body element 2 is impregnated with an electrolyte solution enclosed in the case 1.
[0011]
The sealing plate 3 is formed continuously in the circumferential direction on the case 1, with the outer peripheral portion thereof positioned below the crimped portion 1 b formed so as to fold the upper end portion of the case 1 inward. Between the throttle part 1a, it is sealingly fixed via the annular gasket 4 which consists of rubber-like elastic materials. The outer periphery of the case 1 is covered with an outer can 5.
[0012]
The sealing plate 3 is provided with a pair of electrode terminals 7 connected to the element body 2 via lead wires 6 in the thickness direction, and is provided with a pressure release valve 8 according to the present invention. Yes. The electrode terminals 7 and 7 are integrated with the sealing plate 3 in a state of being partially embedded by insert molding, and are detached from the sealing plate 3 by the flange portions 7a formed on the outer peripheral surface. It has been stopped.
[0013]
FIG. 2 is an enlarged cross-sectional view showing the first embodiment of the pressure release valve 8 applied to the capacitor shown in FIG. 1 cut along the line II-II ′ in FIG. 3 is a plan view showing a fixed plate used in the pressure release valve 8. FIG. That is, as shown in FIG. 2, the pressure release valve 8 of the present embodiment includes a valve seat 3 b in which a valve hole 3 a is opened on the inner periphery of the sealing plate 3, and the sealing plate 3 from the outer periphery of the valve seat 3 b. A cylindrical surface mounting recess 3c extending toward the outside (upper side in FIG. 2) is formed, and the valve body 8A is mounted on the valve mounting recess 3c.
[0014]
The valve body 8A includes a disk-shaped fixing plate 10 obtained by punching a metal plate and press-molding, and a seal lip 20 formed integrally with the fixing plate 10 with a rubber-like elastic material.
[0015]
Specifically, as shown in FIG. 3, the outer peripheral portion of the fixed plate 10 is a leaf spring portion 11 composed of a large number of elastic pieces 13 by slits 12 formed in the radial direction at equal intervals in the circumferential direction. The leaf spring portion 11 is bent in a tapered shape so that the outer peripheral edge 13a of each elastic piece 13 faces the outside of the valve body 8A. For this reason, the fixed plate 10 is formed in the shape of a disc spring as a whole, and the outer diameter of the leaf spring portion 11 is slightly larger than the inner surface of the valve mounting recess 3c of the sealing plate 3 when not deformed. It is a diameter. On the other hand, the valve mounting recess 3c is formed with a locking groove 3d continuous in the circumferential direction at a position appropriately separated from the valve seat 3b, and the outer peripheral edge 13a of each elastic piece 13 of the leaf spring portion 11 is The locking groove 3d is fitted and locked.
[0016]
The base portion 21 of the seal lip 20 is integrally joined to the inner side surface (the lower surface in FIG. 2) of the fixing plate 10 by vulcanization adhesion or the like, and has a tapered open shape. In a state where the outer peripheral edge 13a of each elastic piece 13 is fitted and locked in the locking groove 3d of the sealing plate 3, the tip lip portion 22 of the seal lip 20 is a surface suitable for the valve seat 3b of the sealing plate 3. It comes to be in close contact with pressure. The seal lip 20 is formed to have a smaller diameter than the inner surface of the valve mounting recess 3c, and is kept in non-contact with the inner surface of the valve mounting recess 3c even when the valve opening operation is performed. An annular space S3 is secured.
[0017]
The slits 12 forming the elastic pieces 13 of the leaf spring portion 11 are appropriately opened to give elasticity, and the seal lip 20 is an internal space (hereinafter referred to as a case internal space) of the case 1 shown in FIG. ) When the valve is opened by the gas pressure (internal pressure) of S1, it functions as an air passage for releasing the internal pressure.
[0018]
The valve body 8A can be mounted in the valve mounting recess 3c of the sealing plate 3 after injecting the electrolyte into the case 1 in the final assembly process of the capacitor or battery. For this reason, it is possible to minimize the evaporation of the electrolytic solution generated in the assembly process and stabilize the product quality. Further, when mounting, it is only necessary to push the valve body 8A into the valve mounting recess 3c with the seal lip 20 leading. That is, when the leaf spring portion 11 of the fixed plate 10 is pressed into the valve mounting recess 3c while undergoing bending deformation and reaches the locking groove 3d, each elastic piece 13 of the leaf spring portion 11 is restored to deformation. Since it is instantly fitted into the locking groove 3d by force and is locked, it can be easily mounted.
[0019]
In the pressure release valve 8 having the above-described configuration, when the internal pressure of the case 1 rises above a predetermined value, the seal lip 20 of the valve body 8A opens, and this internal pressure is released to the atmosphere, causing an abnormal increase in internal pressure. This prevents the case 1 from being destroyed.
[0020]
That is, the pressure (internal pressure) of the gas generated by the reaction of the electrolyte solution enclosed in the case inner space S1 reaches the inner space S2 of the fixing plate 10 and the seal lip 20 via the valve hole 3a. The seal lip 20 acts as a valve opening force that pushes up the tapered pressure receiving surface 23 on the inner peripheral side of the tip lip portion 22 and opens the tip lip portion 22 so as to be lifted from the valve seat 3b. However, in a normal use state, since the internal pressure of the case inner space S1 is equal to or lower than the set valve opening pressure, the tip lip portion 22 of the seal lip 20 is in a closed valve state in close contact with the valve seat 3b. Intrusion of water vapor and foreign matter from the outside is prevented.
[0021]
If for some reason the internal pressure of the case inner space S1 rises above the normal value and the valve opening force becomes greater than the valve closing force due to the elasticity of the seal lip 20, the tip lip portion 22 of the seal lip 20 is removed from the valve seat 3b. The internal pressure of the case inner space S1 is separated from the valve hole 3a through the inner space S2 of the seal lip 20, the opening gap between the tip lip 22 of the seal lip 20 and the valve seat 3b, the seal lip 20 and the valve. It is opened to the outside atmosphere via the annular space S3 between the mounting recesses 3c and the slits 12 forming the elastic pieces 13 of the leaf spring portion 11. At this time, the heat in the case internal space S1 is also released into the atmosphere, so that deterioration of the function of the capacitor or the battery due to the heat is prevented.
[0022]
When the internal pressure is reduced to a normal value by releasing the pressure, the seal lip 20 immediately closes due to its restoring force (valve closing force) due to its elasticity, and comes into close contact with the valve seat 3b to cause water vapor or foreign matter from the outside. To block intrusions. Thus, since the seal lip 20 opens only when the internal pressure rises above the valve opening pressure, the decrease due to evaporation of the electrolyte is minimized, and the life of the capacitor or battery is improved. Can do.
[0023]
Note that the pressure value (valve opening pressure) when the seal lip 20 of the valve body 8A is opened by the increase of the internal pressure in the case internal space S1 is the inner diameter, thickness, cross-sectional shape, and locking groove 3d of the seal lip 20. It can be arbitrarily set according to the deformation amount given to the seal lip 20 by the formation position (fixed position of the fixed plate 10). The valve opening pressure is appropriately set in consideration of the value of the gas pressure due to heat generated in a normal use state.
[0024]
FIG. 4 is a cross-sectional view showing a second embodiment in which an explosion-proof function is added to the valve main body 8A according to the first embodiment described above, cut at the same position as the cross section of FIG. That is, in the valve main body 8A according to this embodiment, the fixing plate 10 has the inner peripheral hole 10a, and the rubber film 24 extending from the base 21 of the seal lip 20 is formed so as to close the inner peripheral hole 10a. The central portion of the rubber film 24 is thinly formed by the recess 24a, and when the internal pressure in the case inner space S1 rises above a predetermined high pressure value higher than the valve opening pressure of the seal lip 20, The film 24 is broken by the concentration of the tensile stress on the thin portion 24b.
[0025]
In the first embodiment shown in FIG. 2 described above, the electrolytic solution in the case 1 adheres to the seal lip 20 and is solidified, or the rubber-like elastic material forming the seal lip 20 is used. In the unlikely event that the seal lip 20 is stuck to the valve seat 3b due to the adhesiveness it has, even if the internal pressure of the case inner space S1 rises far beyond the set valve opening pressure, the seal lip 20 It is also assumed that the lip 20 does not open well. In such a case, according to the present embodiment, when the internal pressure rises beyond a predetermined high value, the rubber film 24 is broken from the thin portion 24b, and the internal pressure is instantaneously released, so that the explosion of the case 1 is prevented. be able to.
[0026]
FIG. 5 shows, as an example in which the cross-sectional shape of the seal lip 20 is changed, a third embodiment of the pressure release valve 8 applied to the condenser shown in FIG. It is sectional drawing shown. That is, in the pressure relief valve 8 according to this embodiment, the seal lip 20 in the valve main body 8A has an outer peripheral surface 25 that is substantially cylindrical, has no outer peripheral constriction 26 as shown in FIG. 22 has an R surface, and the pressure receiving surface 23 on the inner peripheral side from the tip lip portion 22 has a taper shape that recedes toward the fixed plate 10 toward the inner periphery.
[0027]
The configuration of the other parts is the same as that of the embodiment shown in FIG.
[0028]
According to this embodiment, the seal lip 20 is thicker than those in FIGS. 2 and 3, and the valve opening force due to the internal pressure in the case internal space S1 acts in the compression direction of the seal lip 20. The sealing performance in the closed state can be improved and the valve opening pressure can be increased.
[0029]
2, 4 and 5, the leaf spring portion 11 of the fixed plate 10 is locked in the locking groove 3d formed in the valve mounting recess 3c of the sealing plate 3, but the locking groove 3d. It can also be set as the structure which does not exist. FIG. 6 is a partial cross-sectional view showing a fourth embodiment in which the leaf spring portion 11 of the fixed plate 10 is locked by being pressed against the inner surface of the valve mounting recess 3c. That is, the outer peripheral edge 13a of each elastic piece 13 in the leaf spring portion 11 is in pressure contact with the inner surface of the valve mounting recess 3c formed in a cylindrical shape, whereby the fixed plate 10 and thus the valve body 8A are locked.
[0030]
According to this embodiment, when a load F that pushes the valve body 8A outward from the valve mounting recess 3c, that is, a load F that pushes upward in FIG. 6, acts on the inner surface of the valve mounting recess 3c. A deforming force that increases the taper angle θ acts on each elastic piece 13 of the leaf spring portion 11 between the outer peripheral edge 13a. For this reason, since the pressure contact force of the outer periphery 13a with respect to the inner surface of the valve mounting recess 3c increases as the load F in the separation direction increases, the valve body 8A does not easily fall off.
[0031]
Next, FIG. 7 is a cross-sectional view showing a fifth embodiment of the pressure release valve 8 applied to the capacitor shown in FIG. 1, cut at the same position as the cross section of FIG. 2, and FIG. It is sectional drawing cut | disconnected and shown by the VIII-VIII 'line. That is, in this embodiment, the valve main body 8A includes a bottomed cylindrical fixed plate 10 obtained by stamping and pressing a metal plate, a seal lip 20 and an annular elastic body integrally formed with the fixed plate 10 with a rubber-like elastic material. 30.
[0032]
Specifically, the fixed plate 10 includes a disk portion 14 and a cylindrical portion 15 extending from the outer periphery thereof toward the outside of the valve mounting recess 3c of the sealing plate 3, and the cylindrical portion 15 has a smaller diameter than the inner diameter of the valve mounting recess 3c. Is formed.
[0033]
The seal lip 20 has a base portion 21 that is integrally joined to the inner side surface (lower surface in FIG. 7) of the disk portion 14 of the fixing plate 10 by vulcanization adhesion or the like, and has a tapered open shape. The lip 22 is brought into close contact with the valve seat 3b of the sealing plate 3 with an appropriate surface pressure. The seal lip 20 is formed to have a smaller diameter than the inner surface of the valve mounting recess 3c, and is kept in non-contact with the inner surface of the valve mounting recess 3c even when the valve opening operation is performed. An annular space S3 is secured.
[0034]
The annular elastic body 30 is formed continuously from the base 21 of the seal lip 20 and is integrally joined to the outer peripheral surface of the cylindrical portion 15 of the fixed plate 10 by vulcanization adhesion or the like. The outer diameter of the annular elastic body 30 is appropriately larger than the inner diameter of the valve mounting recess 3c when the valve body 8A is not mounted, that is, it is press-fitted into the valve mounting recess 3c with an appropriate crushing margin. On the outer peripheral surface, ventilation grooves 31 that are open to both ends in the axial direction are formed at a plurality of locations in the circumferential direction.
[0035]
The valve body 8A can also be mounted in the valve mounting recess 3c of the sealing plate 3 after injecting the electrolytic solution into the case 1 in the final assembly process of the capacitor or battery. For this reason, it is possible to minimize the evaporation of the electrolytic solution generated in the assembly process and stabilize the product quality. Further, when mounting, it is only necessary to press-fit the valve body 8A into the valve mounting recess 3c to a predetermined depth so that the seal lip 20 precedes. Then, as shown in FIG. 7, for example, the end lip portion 22 of the seal lip 20 is inserted into the valve of the sealing plate 3 by press-fitting so that the end of the valve body 8 </ b> A is substantially flush with the outer surface of the sealing plate 3. The seat 3b is brought into close contact with an appropriate surface pressure.
[0036]
Similarly to the first to third embodiments, the pressure release valve 8 having the above configuration also reaches the disk portion 14 of the fixed plate 10 and the inner space S2 of the seal lip 20 through the valve hole 3a. In a normal use state in which the internal pressure of the inner space S1 is equal to or lower than the set valve opening pressure, the seal lip 20 is in a closed state. When the case internal pressure rises beyond the valve opening pressure for some reason, the seal lip 20 is opened by the internal pressure acting on the tapered pressure receiving surface 23, and the internal pressure is sealed from the valve hole 3a. An inner space S2 of the lip 20, a valve opening gap between the tip lip portion 22 of the seal lip 20 and the valve seat 3b, an annular space S3 between the seal lip 20 and the valve mounting recess 3c, and a ventilation groove 31 of the annular elastic body 30 are provided. To the outside atmosphere. Further, when the internal pressure is reduced to a normal value by releasing the pressure, the seal lip 20 immediately closes by the restoring force (valve closing force) due to its elasticity, and blocks the entry of water vapor and foreign matters from the outside.
[0037]
The internal pressure of the case also acts in the direction in which the valve body 8A is extracted from the valve mounting recess 3c, but the valve body 8A can easily move in the direction of extraction when the pressure is about the valve opening pressure of the seal lip 20. In order to prevent this, a sufficient pressure contact force derived from the crushing margin of the annular elastic body 30 is set on the inner peripheral surface of the valve mounting recess 3c. Further, if the separation pressure due to this pressure contact force (crushing allowance) is set to a predetermined pressure value higher than the valve opening pressure, the internal pressure of the case rapidly increases due to the occurrence of some abnormality, and the seal lip 20 opens. When the internal pressure rises faster than the pressure release speed due to the valve and becomes a high pressure exceeding the release pressure, the valve body 8A is released from the valve mounting recess 3c, and the internal pressure is released to the atmosphere at once. 1 explosion can be prevented.
[0038]
FIG. 9 shows an example in which the cross-sectional shape of the seal lip 20 is changed by cutting the sixth embodiment of the pressure release valve 8 applied to the capacitor shown in FIG. 1 at the same position as the cross-section of FIG. It is sectional drawing shown. That is, the valve body 8A in this embodiment is basically the same as the fifth embodiment shown in FIGS. 7 and 8, and a fixed plate 10 obtained by stamping a metal plate and press-molding, and the fixed plate 10 is rubber-like. It consists of a seal lip 20 and an annular elastic body 30 that are integrally formed of an elastic material, and both axial ends are provided at a plurality of circumferential positions on the outer peripheral surface of the annular elastic body 30 that is press-fitted into the valve mounting recess 3 c of the sealing plate 3. It has a configuration in which a vent groove 31 that is open is formed.
[0039]
In this embodiment, the seal lip 20 is thinner and longer than that shown in FIG. 7, so that a relatively low valve opening pressure, that is, an increase in the internal pressure of the case internal space S <b> 1 is compared. Even if it is small, the seal lip 20 opens, and the internal pressure is released to the atmosphere. Further, in order to make the seal lip 20 have a long cross-sectional shape, the fixing plate 10 is formed in a flat plate shape, that is, from the outer periphery of the disk portion 14, the cylindrical portion 15 faces inward (lower side in FIG. 9). Thus, the length from the base portion 21 of the seal lip 20 joined to the inner surface of the disk portion 14 to the tip lip portion 22 is increased.
[0040]
FIG. 10 is a cross-sectional view showing a seventh embodiment of the pressure release valve 8 applied to the capacitor shown in FIG. 1, cut at the same position as the cross section of FIG. A valve body 8A according to this embodiment is obtained by adding a dust lip 40 as a second seal lip to the valve body shown in FIG.
[0041]
The dust lip 40 is formed continuously from the annular elastic body 30 and is formed of a rubber-like elastic material. The dust lip 40 extends so as to protrude outside the valve mounting recess 3 c of the sealing plate 3, and The tip lip 41 is in close contact with the surface 3e of the sealing plate 3 with a slight surface pressure.
[0042]
According to this embodiment, since the dust lip 40 exists so as to cover the outside of the ventilation groove 31 formed in the annular elastic body 30, it prevents foreign matter from entering the sealing lip 20 from the ventilation groove 31. It functions as a dust seal. Therefore, it is possible to prevent water droplets or the like from entering and collecting on the outer periphery of the seal lip 20. Further, when the internal pressure of the case internal space S1 rises above the valve opening pressure for some reason, the internal pressure increases from the valve hole 3a to the inner space S2 of the seal lip 20, the tip lip portion 22 of the seal lip 20, and the valve. It reaches the inner circumferential space S4 of the dust lip 40 via the valve opening gap of the seat 3b, the annular space S3 between the seal lip 20 and the valve mounting recess 3c, and the ventilation groove 31 of the annular elastic body 30. The front end lip 41 is pushed open to be released to the outside atmosphere. Due to the shape of the dust lip 40, the surface pressure against the surface 3e of the sealing plate 3 is small enough not to prevent pressure release.
[0043]
In the embodiment described above, the sealing plate for sealing the capacitor or the battery case has been described with respect to the application of the present invention. However, the pressure releasing mechanism of a general pressure vessel can also be implemented. .
[0044]
【The invention's effect】
According to the pressure relief valve of the first aspect of the invention, the seal lip integrally provided on the fixing plate locked to the valve mounting recess formed on the sealing plate has an internal pressure that acts on the seal lip through the valve hole. In a normal state where the pressure is less than or equal to a predetermined value, the valve is closed close to the valve seat. Since the internal pressure is released to the atmosphere through the air passage formed therebetween, it is possible to prevent the pressure vessel from being destroyed due to an increase in internal pressure, and the valve opening pressure can be arbitrarily set. Moreover, when the internal pressure is released, the seal lip immediately closes, so that the entry of foreign matter from the outside can be blocked and the release of gas and the like in the pressure vessel can be minimized.
[0045]
According to the pressure release valve of the second aspect of the present invention, the leaf spring portion of the fixed plate is locked into the retaining state by press-fitting the leaf spring portion of the fixing plate into the valve mounting recess of the sealing plate. Since the slit for imparting elasticity to the portion also serves as a ventilation path when the valve is opened, a simple structure can be achieved.
[0046]
According to the pressure relief valve of the third aspect of the invention, the required number of grooves formed in the valve mounting recess by the annular elastic body formed on the outer peripheral portion of the fixed plate, and the ventilation path formed in the annular elastic body. Since the annular elastic body is made of a rubber-like elastic material and is continuously formed with the seal lip, a simple structure can be obtained.
[0047]
According to the pressure relief valve of the fourth aspect of the invention, since the second seal lip functioning as a dust seal is provided, it is possible to prevent foreign matter from entering the seal lip side.
[0048]
According to the pressure release valve of the invention of claim 5, the internal pressure of the pressure vessel is higher than the set valve opening pressure of the seal lip for some reason, for example, the valve opening operation of the seal lip is not smoothly performed. Since the rubber film is broken and the internal pressure is instantaneously released, explosion of the pressure vessel can be prevented.
[Brief description of the drawings]
1A and 1B show a schematic structure of a capacitor to which a pressure release valve according to the present invention is applied, wherein FIG. 1A is a longitudinal sectional view and FIG. 1B is a plan view.
FIG. 2 is an enlarged cross-sectional view showing a first embodiment of a pressure release valve 8 applied to the capacitor shown in FIG. 1, cut along line II-II ′ in FIG.
FIG. 3 is a plan view showing a fixed plate used in the pressure release valve 8 of FIG.
4 is a cross-sectional view showing a second embodiment in which an explosion-proof function is added to the valve body 8A in the first embodiment, cut at the same position as the cross section of FIG.
5 is a cross-sectional view showing a third embodiment of a pressure release valve 8 applied to the capacitor shown in FIG. 1, cut at the same position as that of the cross section of FIG. 2;
6 is a partial cross-sectional view showing a fourth embodiment of a pressure release valve 8 applied to the capacitor shown in FIG. 1; FIG.
7 is a cross-sectional view showing a fifth embodiment of a pressure release valve 8 applied to the capacitor shown in FIG. 1, cut at the same position as that of the cross section of FIG. 2;
8 is a cross-sectional view taken along line VIII-VIII ′ in FIG.
9 is a cross-sectional view showing a sixth embodiment of a pressure release valve 8 applied to the capacitor shown in FIG. 1, cut at the same position as that of the cross section of FIG. 2;
10 is a cross-sectional view showing a seventh embodiment of a pressure release valve 8 applied to the capacitor shown in FIG. 1, cut at the same position as that of the cross section of FIG. 2;
[Explanation of symbols]
1 Case (pressure vessel)
3 Sealing plate
3a Valve hole
3b Valve seat
3c Valve mounting recess
3d Locking groove
3e surface
8 Pressure release valve
8A Valve body
10 Fixing plate
11 leaf spring
12 Slit (ventilation passage)
13 Elastic pieces
14 Disc part
15 Cylindrical part
20 Seal lip
21 Base
22 Tip lip
23 Pressure sensing surface
24 Rubber film
30 Annular elastic body
31 Ventilation groove (ventilation passage)
40 Dustrip (second seal lip)
Space in S1 case
S2 Inside space of seal lip
S3 annular space (ventilation passage)

Claims (5)

A flat valve seat (3b) in which a valve hole (3a) is opened in the inner periphery on the sealing plate (3) sealed in the opening of the pressure vessel (1), and an outer periphery of the valve seat (3b) A valve mounting recess (3c) extending from the sealing plate (3) toward the outside of the sealing plate (3) and having a valve body (8A) disposed on the inner periphery is formed. The valve body (8A) is formed of the valve mounting recess (3c). ) And a sealing lip (20) which is provided integrally with the fixing plate (10) and opens in a tapered shape. The lip portion (22) is in close contact with the valve seat (3b), and the valve is opened by the internal pressure of the pressure vessel (1) acting on the tapered pressure receiving surface (23) on the inner periphery of the tip lip portion (22) valve opening operation by a force larger than the valve closing force caused by the elasticity of the sealing lip (20) A shall, pressure relief valve, wherein the air passage is formed between the valve mounting recess (3c) and the fixing plate (10). The fixed plate (10) is locked to the valve mounting recess (3c) by a leaf spring portion (11) formed on the outer peripheral portion thereof, and the leaf spring portion (11) is locked to the valve mounting recess (3c). The outer peripheral edge (13a) is bent so as to face the outside of the valve body (8A), and the ventilation path is composed of a number of slits (12) formed in the leaf spring portion (11). The pressure relief valve according to claim 1. The fixing plate (10) is fitted into the valve mounting recess (3c) by an annular elastic body (30) integrally formed with a rubber-like elastic material on the outer peripheral portion thereof, and a ventilation path is formed in the annular elastic body (30). 2. The pressure relief valve according to claim 1, comprising a required number of grooves (31) formed. The fixing plate (10) is provided with a second seal lip (40) that is in close contact with the sealing plate (3) outside the air passage and opens the valve by a predetermined internal pressure on the air passage side. The pressure release valve according to any one of claims 1 to 3. A hole (10a) closed with a rubber film (24) is formed in the fixing plate (10), and the rubber film (24) has a predetermined pressure higher than the pressure value when the seal lip (20) is opened. The pressure relief valve according to claim 1, wherein the pressure relief valve is broken at a pressure value of 5.

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