JP2020102541A - Pressure release valve - Google Patents

Abstract

To suppress a gap leakage due to an engagement of an electrolyte between an outer edge and a valve seat of a seal lip.SOLUTION: A pressure release valve 100 comprises: a valve chamber 110 which opens to an atmosphere side, is communicated on an inner device side via a communication hole 111 provided on a bottom side, and makes a taper-shaped valve seat 112 reducing a diameter toward the communication hole communicate to the communication hole; a valve body 120 which is arranged in a valve chamber, in which a seal lip 122 having elasticity for being adhered to the valve seat is provided on an outer peripheral side, and a bottom face 122b of the seal lip is extended from a contact point 122a1 with the valve seat to a horizontal direction or lower them; and a support member 130 which is provided to an open of the atmosphere side of the valve chamber with an air permeability, and supports the valve body to a pulling-out prevention direction to the atmosphere side. The valve body is structured so as to be arranged in the valve chamber via the support member.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pressure release valve provided in an opening of a pressure container for electric parts such as a condenser, a capacitor, and a battery.

In a hermetically sealed aluminum electrolytic capacitor, an electric double layer capacitor, or the like, the opening of a pressure container that houses the element body is closed by a sealing plate that is sealed via a gasket. When electric components such as capacitors are completely sealed, the internal pressure of the container rises due to the Joule heat that evaporates the electrolyte containing ethylene glycol, propion carbonate, etc. as the main component when a sudden load is applied. However, there is a possibility that the function and life of the capacitor may be shortened. For this reason, the sealing plate has a pressure release function when the internal pressure rises in order to prevent the evaporation of the electrolyte serving as the filling liquid and the intrusion of foreign substances from the outside and to release the gas generated in the pressure vessel. A pressure relief valve is provided.

As such a pressure release valve, for example, in Patent Document 1, a self-returning one-way valve type pressure in which a valve body having a seal lip that can be opened and closed with a predetermined pressure as a threshold value is arranged at a pressure release port of a condenser is disclosed. An open valve is disclosed. Patent Document 2 discloses a self-returning one-way valve type gas relief valve that is attached to an access port of a storage battery.

JP, 2006-313715, A Japanese Patent Publication No. 2008-533658

However, in the self-returning one-way valve, when the pressure inside the pressure vessel rises and the internal pressure is released, the electrolytic solution may also blow out to the vicinity of the valve hole. At that time, the electrolytic solution may adhere to and adhere to the outer edge of the seal lip or the vicinity of the valve hole. For this reason, it is necessary to suppress the leakage of the electrolytic solution, which is generated when the electrolytic solution adhered to the outer edge of the seal lip is caught in the valve seat of the valve chamber.

An object of the present invention is to provide a pressure release valve capable of suppressing the leakage of the electrolyte gap.

A pressure release valve according to an aspect of the present invention is a valve having a taper shape that opens to the atmosphere side, communicates with the inside of a machine through a communication hole provided on the bottom side, and reduces the diameter toward the communication hole. A valve chamber that connects a seat to the communication hole; and a seal lip, which is disposed in the valve chamber and has elasticity that is in close contact with the valve seat, is provided on the outer peripheral side, and a bottom surface of the seal lip is the valve seat. A valve main body extending horizontally from the contact point or less and an opening on the atmosphere side of the valve chamber with air permeability, and with the seal lip in close contact with the valve seat, the valve main body is pulled out to the atmosphere side. And a support member that supports in the stopping direction.

According to the present invention, it is possible to suppress the gap leakage due to the biting between the outer edge of the seal lip of the electrolytic solution and the valve seat.

It is sectional drawing which cut|disconnects and shows one Embodiment of a pressure release valve in the thickness direction of a sealing plate. It is sectional drawing which cut|disconnects and shows other embodiment of a pressure release valve in the thickness direction of a sealing plate. It is sectional drawing which cut|disconnects and shows the conventional pressure release valve used as a comparative example in the thickness direction of a sealing plate.

Hereinafter, preferred embodiments of the pressure release valve will be described in detail. Note that the present embodiment described below does not limit the content of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as a solution means of the present invention. Not necessarily.

First, the configuration of an embodiment of the pressure release valve will be described with reference to FIG. Note that FIG. 1 shows a cross-sectional view of one embodiment of the pressure release valve taken along the central axis in the thickness direction of the sealing plate.

The pressure release valve 100 is provided at an opening of a pressure container of an electric component such as a condenser, a capacitor, a battery, etc., and is configured so that it can be opened when the internal pressure of the pressure container rises above a predetermined level. There is. That is, the pressure release valve 100 normally closes the opening of the pressure container in order to prevent the evaporation of the electrolytic solution in the pressure container and the invasion of foreign substances from the outside, so that the pressure inside the pressure container has a predetermined value. In the event of an emergency when the size of the pressure vessel is exceeded, it has a function of opening the opening of the pressure vessel in order to release the gas generated in the pressure vessel to the outside. In the present embodiment, in the pressure release valve 100, as shown in FIG. 1, the valve body 120 is arranged inside the valve chamber 110 via the support member 130.

The valve chamber 110 has a function of accommodating the valve main body 120 that opens to the atmosphere side and opens and closes the opening of the pressure vessel, and the gas is applied to the sealing plate 105 made of an electrically insulating material and sealed to the opening of the pressure vessel. It is configured by forming a hole for extraction. In the present embodiment, as shown in FIG. 1, the valve chamber 110 is provided with a communication hole 111 on the center side of the bottom surface, and is configured to communicate with the inside of an electric component such as a capacitor through the communication hole 111. ing.

Further, in the present embodiment, the valve chamber 110 is provided with a tapered valve seat 112 whose diameter is reduced from the side wall 113 toward the outer edge 111a of the communication hole 111. That is, in the present embodiment, in the valve chamber 110, the valve seat 112 on which the valve main body 120 is mounted has a tapered shape, and the valve seat 112 is connected to the communication hole 111. Further, the valve chamber 110 of the present embodiment is provided with a stepped portion 114 on which the upper end side is expanded and the support member 130 is mounted, and an expanded diameter portion 115.

The support member 130 is provided in the opening on the atmosphere side of the valve chamber 110 with air permeability, fixes the upper end side of the seal body 121 provided in the valve body 120, and causes the seal lip 122 to be in close contact with the valve seat 112. It has a function of supporting the main body 120 in a retaining direction to prevent retaining of the body 120 to the atmosphere side. In the present embodiment, the support member 130 is formed by punching and pressing a metal plate made of spring steel or the like, and includes a disc portion 131 on the inner periphery and a plurality of plates formed on the outer periphery at equal intervals in the circumferential direction. The spring 132 is formed, and is formed in a disc spring shape as a whole.

The leaf spring 132 is bent in a tapered shape so as to face the outside of the valve chamber 110, and when the support member 130 is not attached, the outer diameter of the support member 130 represented by the diameter of the circumscribed circle of the leaf spring 132 is It is formed to have a diameter slightly larger than the inner peripheral surface of the enlarged diameter portion 115 of the valve chamber 110. A slit portion 133 is provided between the leaf springs 132 so as to be deployed inside the inner surface of the side wall 113 of the valve chamber 110. By providing the slit portion 133 in the support member 130 as described above, it is possible to ensure air permeability in the opening of the valve chamber 110 on the atmosphere side.

In the present embodiment, in the support member 130, the protrusion 121 a provided on the center side of the upper end of the seal body 121 of the valve body 120 is fitted into the fitting hole 131 a arranged on the center side of the disc part 131. By doing so, the support member 130 and the valve body 120 are integrally coupled to fix the valve body 120. Then, in the support member 130, the leaf spring 132 is placed on the step portion 114, and the tip end of the leaf spring 132 is brought into pressure contact with the inner peripheral surface of the enlarged diameter portion 115 of the valve chamber 110, whereby The outer edge 122a of the seal lip 122 is brought into close contact with the valve seat 112 of the valve chamber 110 at a predetermined pressure to support the valve body 120 in a retaining direction that prevents retaining of the valve body 120 to the atmosphere side.

The valve body 120 is provided so as to cover the communication hole 111 of the valve chamber 110, and has a function of opening and closing when the pressure inside the pressure container reaches a predetermined threshold value. In the present embodiment, the valve main body 120 is developed in a flange shape from the lower end of the outer peripheral surface of the seal main body 121 to the outer side, and the seal main body 121 provided at a position opposed to the communication hole 111 of the valve chamber 110. The seal lip 122 provided as a unit is integrally formed of an elastic body such as a rubber material or a mixture of resin and rubber. As the material of the elastic body forming the valve body 120, considering hydrolysis resistance, there is no fear of hydrolysis in an acid or alkaline atmosphere like VMQ (vinyl methyl silicone rubber), electrolytic solution resistance, and low temperature. EPDM (ethylene propylene diene rubber) is particularly preferable because a material having a good balance of properties and the like is preferable.

As shown in FIG. 1, the seal body 121 is made of a substantially cylindrical elastic body, and is provided with a protrusion 121a at the center of its upper end. The seal body 121 is fixed to and supported by the support member 130 by fitting the protrusion 121 a into the fitting hole 131 a arranged on the center side of the disk portion 131 of the support member 130. Further, the shoulder portion 121 c provided on the outer peripheral side of the protrusion 121 a of the seal body 121 is in close contact with the inner side surface of the disc portion 131 of the support member 130.

The seal lip 122 is configured such that, when the seal body 121 of the valve body 120 is fixed and supported by the support member 130, the outer edge 122 a thereof comes into close contact with the valve seat 112 provided on the bottom surface side of the valve chamber 110. Has been done. That is, the seal lip 122 functions to seal the communication hole 111 by bringing the outer edge 122a into close contact with the valve seat 112 with a predetermined pressure due to the elastic force of the seal lip 122.

In this embodiment, the seal lip 122 has a bottom surface 122b of the seal lip 122 such that the contact point 122a1 between the outer edge 122a of the seal lip 122 and the valve seat 112 of the valve chamber 110 is at the same height as the center 121b1 of the bottom surface 121b of the seal body 121. The bottom surface 121b of the seal body 121 is formed horizontally. That is, in the present embodiment, the bottom surface 122b of the seal lip 122 extends horizontally from the contact point 122a1 with the valve seat 112 toward the center 121b1 of the bottom surface 121b of the seal body 121 on the central axis of the valve body 110. Is formed in.

As described above, in this embodiment, the bottom surface 122b of the seal lip 122 and the bottom surface 121b of the seal body 121, which are the bottom surface side of the valve body 120, are flat, so that the bottom surface 122b of the seal lip 122 serves as the valve seat 110. From the contact point 122a1 of the above. Further, the pressure release valve 100 of the present embodiment is provided between the valve seat 112 provided in the valve chamber 110 of the sealing plate 105 and the disc portion 131 of the support member 130 in a state where the valve body 120 is attached to the support member 130. It has been properly compressed and undergoes bending deformation. For this reason, the outer edge 122a of the seal lip 122 of the valve body 120 is brought into close contact with the tapered valve seat 112 with an appropriate contact width of the crushing margin to ensure the sealing performance.

That is, when the pressure of the gas generated by the reaction of the electrolytic solution enclosed in the pressure vessel reaches the outer edge 122a of the seal lip 122 of the valve body 120 via the communication hole 111 of the valve chamber 110, the seal lip 122 is opened. It acts as a valve opening force. Therefore, when this valve opening force becomes larger than the valve closing force due to the elasticity of the seal lip 122, the outer edge 122a of the seal lip 122 separates from the valve seat 112 to open the valve, and the generated gas is released from the valve seat 112 and the seal lip. It is adapted to be opened to the outside atmosphere through a slit portion 133 between each leaf spring 132 of the support member 130 from a gap with 122.

Then, when the generated gas is released to the outside and the internal pressure of the pressure vessel decreases, the outer lip 122a of the seal lip 122 of the valve body 120 comes into close contact with the valve seat 112 by the valve closing force derived from its own elastic force, Blocks invasion of water vapor and foreign substances from the outside. In this way, in the pressure release valve 100 of the present embodiment, the seal lip 122 opens only when the internal pressure rises above the valve opening pressure, so that the decrease due to evaporation of the electrolytic solution is minimized. It is possible to improve the life of the electric parts to which the electrolytic capacitors are applied.

Further, in the present embodiment, the valve body 120 and the support member 130 are preliminarily attached to each other by fitting the protrusion 121a of the seal body 121 of the valve body 120 and the fitting hole 131a of the disc portion 131 of the support member 130. Are united together. Therefore, when the valve body 120 is mounted in the valve chamber 110 via the support member 130, the leaf spring 132 of the support member 130 is simply press-fitted into the expanded diameter portion 115 until it comes into contact with the stepped portion 114. Since the outer edge 122a of the seal lip 122 is brought into close contact with the valve seat 112 at a predetermined pressure while simultaneously mounting the coupled valve bodies 120, the mounting operation of the pressure release valve 100 can be performed easily and quickly. Further, by fitting the protrusion 121a of the seal body 121 of the valve body 120 into the fitting hole 131a of the support member 130, it is possible to perform highly accurate positioning so as to be concentric with the valve chamber 110. it can.

Further, in the present embodiment, the bottom surface 122b of the seal lip 122, which is the bottom surface side of the valve body 120, and the bottom surface 121b of the seal body 121 are horizontally extended. Therefore, even if the electrolytic solution enclosed in the pressure vessel adheres to the bottom surface 121b of the seal body 121 and the bottom surface 122b of the seal lip 122, most of the electrolytic solution does not reach the outer edge 122a of the seal lip 122. The electrolytic solution falls off from the bottom surface 121b of the seal body 121 and the bottom surface 122b of the seal lip 122 by its own weight and is returned to the inside of the pressure vessel through the communication hole 111. Therefore, the electrolytic solution reaches the outer edge 122a of the seal lip 122 and is fixed thereto, and the gap leakage due to the electrolytic solution being caught between the outer edge 122a of the seal lip 122 and the valve seat 112 is suppressed. Become.

Further, in the present embodiment, the valve seat 112 on which the valve main body 120 provided in the valve chamber 110 is mounted has a taper shape that is formed so as to reduce its diameter toward the communication hole 111. Therefore, when the electrolytic solution adhering to the bottom surface 121b of the seal body 121 or the bottom surface 122b of the seal lip 122 falls off to the valve seat 112, the electrolytic solution enters the pressure vessel along the tapered valve seat 112 through the communication hole 111 due to its own weight. Will come back. That is, the electrolytic solution attached to the valve seat 112 is easily returned to the inside of the pressure vessel inside the machine via the communication hole 111 by its own weight.

As described above, in the present embodiment, the bottom surface side of the valve main body 120 has a flat shape, and the valve seat 112 of the valve chamber 110 has a tapered shape in which the diameter is reduced toward the communication hole 111. For this reason, the electrolytic solution that is caught in the gas generated in the pressure vessel and adheres to the bottom surface side of the valve body 120 adheres to the outer edge 122a of the seal lip 122 of the valve body 120, and the outer edge 122a and the valve seat 112 are separated from each other. The risk of being caught in the gap can be reduced. That is, since the electrolytic solution attached to the bottom surface 122b of the seal lip 122 or the bottom surface 121b of the seal body 121 is less likely to collect between the outer edge 122a of the seal lip 122 and the valve seat 112, the gap leakage due to the biting of the electrolytic solution is suppressed. Will be done.

The shape of the bottom surface side of the valve body 120 is not limited to the flat shape shown in FIG. That is, the bottom surface 122b of the seal lip 122 may extend from the contact point 122a1 with the valve seat 112 at least in the horizontal direction or less.

Next, the configuration of another embodiment of the pressure release valve will be described with reference to FIG. Note that FIG. 2 shows a cross-sectional view of another embodiment of the pressure relief valve taken along the central axis in the thickness direction of the sealing plate.

In the pressure release valve 200 of this embodiment, as shown in FIG. 2, a valve body 220 is arranged inside the valve chamber 110 via a support member 130. In the pressure release valve 200 of the present embodiment, the valve chamber 110 and the support member 130 have the same configurations and functions as those of the pressure release valve 100 of the above-described embodiment, and thus the description thereof will be omitted.

The valve body 220 is provided so as to cover the communication hole 111 of the valve chamber 110, and has a function of opening and closing when the pressure inside the pressure container reaches a predetermined threshold value. In the present embodiment, the valve main body 220 is developed in a flange shape from the lower end of the outer peripheral surface of the seal main body 221 to the outer side, and the seal main body 221 provided at a position facing the communication hole 111 of the valve chamber 110. The seal lip 222 provided as a unit is integrally formed of a rubber material such as EPDM (ethylene propylene diene rubber) or an elastic body such as a mixture of resin and rubber.

As shown in FIG. 2, the seal body 221 is made of a substantially cylindrical elastic body, and is provided with a protrusion 221a at the center of its upper end. The seal body 221 is supported while being fixed to the support member 130 by the protrusion portion 221 a being fitted into the fitting hole 131 a arranged on the center side of the disk portion 131 of the support member 130. Further, the shoulder portion 221c provided on the outer peripheral side of the protrusion 221a of the seal body 221 is in close contact with the inner side surface of the disc portion 131 of the support member 130.

The seal lip 222 is configured such that, when the seal body 221 of the valve body 220 is fixed and supported by the support member 130, the outer edge 222 a of the seal lip 222 comes into close contact with the valve seat 112 provided on the bottom surface side of the valve chamber 110. ing. That is, the seal lip 222 functions to seal the communication hole 111 by bringing the outer edge 222a into close contact with the valve seat 112 with a predetermined pressure due to the elastic force of the seal lip 222.

In this embodiment, as shown in FIG. 2, the bottom surface 221b of the seal body 221 is formed in a convex shape, and the bottom surface 221b of the seal body 221 and the bottom surface 222b of the seal lip 222 are continuous taper surfaces. The bottom surface side of the valve body 220 is formed in a convex shape. That is, in the present embodiment, the bottom surface 222b of the seal lip 222 has a taper shape that descends from the contact point 222a1 with the valve seat 112 toward the center 221b1 of the bottom surface 221b of the seal body 221 on the central axis of the valve body 220. Has been formed. However, in this embodiment, since the valve seat 112 of the valve chamber 110 has a tapered shape that reduces its diameter toward the communication hole 111, in order to make the bottom surface side of the valve body 220 a convex shape, The inclination angle of the taper surface formed by the bottom surface 221b of 221 and the bottom surface 222b of the seal lip 222 needs to be smaller than the inclination angle of the tapered valve seat 112 of the valve chamber 110.

As described above, in the pressure release valve 200 of the present embodiment, the bottom surface side of the valve body 220 is configured to have a convex shape, so that the electrolytic solution enclosed in the pressure container allows the bottom surface 221b of the seal body 221 and the seal lip. Even if it adheres to the bottom surface 222b of 222, the electrolyte solution is easily guided to the center 221b1 of the bottom surface 221b of the seal body 221 by its own weight. Therefore, in the pressure release valve 200 of the present embodiment, the electrolyte that is caught in the gas generated in the pressure vessel and adheres to the bottom surface side of the valve body 220 is more sealed than the pressure release valve 100 of the above-described embodiment. It becomes more difficult to reach the outer edge 222a of 222. Therefore, in the present embodiment, the electrolytic solution adhered to the bottom surface 222b of the seal lip 222 or the bottom surface 221b of the seal body 221 is less likely to collect between the outer edge 222a of the seal lip 222 and the valve seat 112, so that the electrolytic solution is fixed or The risk of gap leakage due to biting can be further reduced.

As described above, in the pressure release valve of each embodiment, the bottom surface side of the valve body has a flat shape or a convex shape so that the bottom surface of the seal lip of the valve body is below the horizontal direction from the contact point with the valve seat. Is configured to extend to. Therefore, it is possible to reduce the risk that the electrolytic solution that is caught in the gas generated in the pressure container and adheres to the bottom surface side of the valve body is caught between the outer edge of the seal lip of the valve body and the valve seat.

That is, in the conventional art, the one-way valve type pressure release valve 1 has a communication hole of the valve seat 12 of the valve chamber 10 formed in the sealing plate 5 sealed to the opening of the pressure container as shown in FIG. The bottom surface side of the valve body 20 fixedly supported by the support member 30 was formed in a concave shape so as to cover 11. Therefore, the electrolytic solution adhering to the bottom surface 21b of the seal body 21 of the valve body 20 and the inner side surface 22b of the seal lip 22 reaches the outer edge 22a of the seal lip 22 while being transmitted through the bottom surface 21b and the inner side surface 22b. Is stuck and fixed between the outer edge 22a of the seal lip 22 and the valve seat 12 of the valve chamber 10 formed in the sealing plate 5, and a gap is generated in the outer edge 22a of the seal lip 22 due to a chemical change, etc. There was concern about leakage.

Therefore, the pressure relief valve of each embodiment has a flat shape or a convex shape on the bottom surface side of the valve body, and a taper shape configured to reduce the diameter of the valve seat toward the communication hole. By this, the retention of the electrolytic solution adhering to the bottom surface side of the valve body between the outer edge of the seal lip and the valve seat is suppressed. That is, by providing the pressure release valve of each embodiment on the opening side of the pressure container of an electric component such as a capacitor, a capacitor, or a battery, the electrolytic solution is caught between the outer edge of the seal lip and the valve seat. Since the gap leakage is suppressed and the life of electric parts such as capacitors can be extended, it has an extremely large industrial value.

Although the embodiments of the pressure release valve have been described above in detail, it will be easily understood by those skilled in the art that many modifications are possible. For example, a term described in the specification or the drawings at least once together with a different term having a broader meaning or the same meaning can be replaced with the different term anywhere in the specification or the drawing. Further, the configuration and operation of the pressure release valve are not limited to those described in each embodiment, and various modifications can be made.

100, 200 Pressure release valve 105 Sealing plate 110 Valve chamber 111 Communication hole 111a (Communication hole) outer edge 112 Valve seat 113 Side wall 114 Step portion 115 Expanded diameter portion 120, 220 Valve body 121, 221 Seal body 121a, 221a Projection portion 121b 221b (seal main body) bottom surface 121b1, 221b1 (bottom surface) center 121c, 221c shoulder 122, 222 seal lip 122a, 222a (seal lip outer edge 122a1, 222a1 contact 122b, 222b (seal lip) bottom surface 130 support Member 131 Disc part 131a Fitting hole 132 Leaf spring 133 Slit part

Claims (4)

A valve chamber that opens to the atmosphere side, communicates with the inside of the machine through a communication hole provided on the bottom surface side, and causes a tapered valve seat that reduces the diameter toward the communication hole to communicate with the communication hole,
A valve body disposed in the valve chamber, provided with an elastic seal lip in close contact with the valve seat on the outer peripheral side, and having a bottom surface of the seal lip extending in a horizontal direction or less from a contact point with the valve seat; ,
A pressure release, comprising: a support member that is provided in the opening of the valve chamber on the atmosphere side with air permeability, and that supports the valve body in a direction to prevent the valve body from coming out toward the atmosphere side in a state where the seal lip is in close contact with the valve seat. valve. The pressure release valve according to claim 1, wherein a bottom surface of the seal lip is horizontally formed from a contact point with the valve seat toward a central axis side of the valve body. The pressure release valve according to claim 1, wherein a bottom surface of the seal lip is formed in a tapered shape that is inclined downward from a contact point with the valve seat toward a central axis side of the valve body. The pressure relief valve according to any one of claims 1 to 3, wherein the seal body of the valve body and the seal lip are integrally formed of an elastic body.

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