JP2000195761A - Safety valve device for capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety valve device which has a small size and a thin thickness and can only discharge a gas from a capacitor filled up with an electrolytic solution. SOLUTION: A safety valve device 18 is attached to the sealant attaching hole of a capacitor which is formed by housing a capacitor element impregnated with an electrolytic solution in a container and blocking the opening of the container with a sealant. The device 18 is provided with a valve main body 20 which is attached to the sealant attaching hole and through which a valve fitting recessing section 21 and a valve mouth 22 are bored, a valve disc 24 having an integrally formed press-contacting projecting section 28 which is put in the recessed section 21 and opens/closes the end section of the mouth 22 on the recessed section 21 side and through which a vent hole 29 is bored, a pressing spring 26 which urges the projecting section 28 of the valve disc 24 to the mouth 22 side, and a filter 30 which is provided on the internal end face side of the mouth 22 and passes a gas. The outer periphery of the projecting section 28 is constituted so that it may come into contact with the mouth 22 in its tapered section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrolytic capacitor,
In a capacitor in which a gas container such as an electrolytic solution is filled in a capacitor container such as an electric double layer capacitor, only the generated gas is effectively separated from the liquid and released to the outside of the container. It is.

[0002]

2. Description of the Related Art Conventionally, a capacitor of this type contains a capacitor element in which a polarizable electrode is separated and wound by a separator and is filled with an electrolytic solution in a capacitor container made of, for example, aluminum. An electrode is led out while covering the opening of the container with a sealing member such as hard rubber, and the opening end of the container is squeezed and sealed so as to be in close contact with the sealing member.

In such a capacitor filled with an electrolytic solution, gas is generated inside, and if the internal pressure increases and explodes, there is a danger. Therefore, a safety valve is provided on a part of the container on the opposite side of the electrode lead-out part of the container. Such as a thin groove is formed. Further, a safety valve may be formed by providing a through-hole in the sealing body and embedding silicon rubber or the like in the through-hole.

[0004]

In a conventional product in which a thin groove such as a cross is formed as a safety valve in a part of such a container, when the thin groove ruptures, not only is gas released, , Liquids and powders are also released at the same time, not only impairing the function as a capacitor,
There is a problem that the discharged liquid or powder may adversely affect circuit elements and the human body. Conventional products using a safety valve in which silicon rubber or the like is embedded have the same problem.

[0005] The present invention is small and thin, and
It is an object of the present invention to provide a safety valve device that can release only gas.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a capacitor having a capacitor container 10 containing a capacitor element 10 impregnated with a filler 12 such as an electrolytic solution and having an opening sealed with a sealing body 13. A safety valve device 18 is attached to a mounting hole 19 penetrating through the sealing body 13, and the safety valve device 18 is attached to the mounting hole 19, and a valve fitting recess 21 and a valve port 22 are perforated through each other. The valve body 20 and the valve fitting recess 21
2 pressure contact protrusion 2 for opening and closing the end of the valve fitting recess 21
8 having a vent hole 29
A pressure spring 26 for urging the pressure contact protruding portion 28 of the valve body 24 toward the valve port 22; and a gas-permeable filter 30 provided on the inner end face side of the valve port 22. The pressure contact protruding portion 28 is a safety valve device for a capacitor, the outer periphery of which is in contact with the valve port 22 at a tapered portion.

When gas is generated in the condenser container 11 and the internal pressure rises, the gas permeates through the filter 30, raises the internal pressure of the valve port 22, and opposes the leaf spring portion 37 of the pressing spring 26. The pressure contact projection 28 of the valve body 24 is pushed up.
Therefore, the gas in the valve port 22 is discharged outside through the vent hole 29. When the gas is released and the internal pressure decreases, the valve body 24 is again actuated by the leaf spring portion 37 of the pressing spring 26.
Is pressed in to close the valve port 22, and the condenser operates normally.

[0008]

Embodiments of the present invention will be described with reference to the drawings. 4 and 5, reference numeral 11 denotes a cylindrical condenser container having an open end made of aluminum. In this capacitor container 11, a capacitor element 10 in which a separator is laminated and wound between two polarizable electrodes and lead wires 16 and 16 are led out from the respective electrodes is stored, and the capacitor element 10 contains an electrolytic solution. Filling material 12 that generates a gas such as A disk-shaped sealing body 13 made of an insulating material such as hard rubber is fitted into the opening end of the capacitor container 11. This sealing body 13
The inner surfaces of the rivet conductors 35, 35 penetrating through are connected to the lead wires 16, and the outer surfaces are connected to the terminals 17, 1.
7 is connected. The outer peripheral portion near the open end of the condenser container 11 is press-bonded so as to form a throttle groove 14, and the open end is an inward folded portion 15.

An attachment hole 19 is formed through a part of the sealing body 13. A thread groove is formed on the inner wall of the portion facing the outside of the mounting hole 19, and a step is formed in the middle of the mounting hole 19, and the portion facing the inside has a slightly smaller diameter. Such a mounting hole 19
In addition, the safety valve device 18 according to the present invention is detachable, and
It is hermetically attached via a rubber packing 38.
1 and 2, which show the detailed structure of the safety valve device 18, the valve body 20 has a disk shape made of a plastic such as phenolic resin or metal, and has a large diameter portion on one side attached to the outer periphery. A screw portion 23 to be screwed into the thread of the hole 19 is formed, and notches 34, 34 for spanners are cut out at an interval of 180 °,
Also, on the other side of the slightly smaller diameter part, there is a valve port 2 in the center.
2 is formed so as to communicate with the valve fitting recess 21, and an annular ridge 31 is bulged at the inner end face.

A valve body 24 made of silicon rubber or the like as shown in FIG. 6 is fitted into the valve fitting recess 21 of the valve body 20. The valve body 24 is fitted with the pressure contact protrusion 28 facing downward, so that the upper edge of the valve port 22 and the tapered surface of the pressure contact protrusion 28 are in close contact with each other, and a flange on the outer periphery of the valve body 24 is provided. A slight gap is formed in the lower surface by the portion 36, and the gap communicates with the vent hole 29 of the valve body 24. This valve body 24
An O-ring 25 made of metal or the like is superimposed thereon, and a plurality of locking claws 33 on the outer periphery of the pressing spring 26 are press-fitted into the inner wall of the valve fitting concave portion 21 so that the valve element 24 and the O-ring 25 , The pressing spring 26 is fixed integrally. At this time, the pressing spring 2
Reference numeral 6 denotes a plurality of leaf spring portions 37 extending toward the center and slightly bent downward, and a pressing contact portion 27 of the valve body 24 is formed at a pressing point 27 at a central portion of the leaf spring portion 37. 28 is pressed against the valve port 22 side to securely close the valve port 22.

A filter 30 made of a porous material and permeable to only gas but not to liquid or powder is applied to the ridge 31 on the other side of the valve port 22. 32, the filter 30 is pressed against the ridge portion 31 and the edge is squeezed and fixed. As the filter 30, it is preferable to use an expanded porous body made of polytetrafluoroethylene, polypropylene, polyethylene, polybutene, polyvinylidene fluoride, or the like. In particular, it is preferable to use an expanded porous body of polytetrafluoroethylene.

In the above configuration, when gas is generated in the condenser container 11 and the internal pressure rises, the gas permeates the filter 30 to increase the internal pressure of the valve port 22 and the plate of the pressing spring 26 The pressure contact protruding portion 28 of the valve body 24 is pushed up against the spring portion 37. Therefore, the gas in the valve port 22 is discharged outside through the vent hole 29. When the gas is released and the internal pressure decreases, the pressure contact protruding portion 28 of the valve body 24 is pushed again by the leaf spring portion 37 of the pressing spring 26, closing the valve port 22, and the capacitor operates normally.

In the above-described embodiment, the pressure contact protrusion 28 of the valve body 24 is provided.
Is a truncated cone, but the shape is not limited to this, and as shown in FIG.
As shown in (b), the shape may be a semicircular sphere.
In short, the configuration is such that the opening edge of the valve port 22 and the outer circumference of the pressing point 27 are in contact with each other with a tapered portion. 1 and 6, the O-ring 25 is superimposed on the valve body 24. However, the O-ring 25 is shown in FIG.
As shown in the figure, the O-ring 2
The O-ring 25 may be omitted by forming a thick portion instead of the O-ring 25.

In the above-described embodiment, the leaf spring portions 37 of the pressing spring 26 are formed in a Y-shape extending radially from the pressing point 27 in three directions at 120 ° intervals. However, the present invention is not limited to this.
As shown in FIG. 7A, it is formed in a cross shape extending in four directions from the pressing point 27, or as shown in FIG. It is also possible to adopt a configuration in which the pressing point 27 portion swells downward as a disc shape. Press spring 2 having various configurations as described above.
6 can be selected according to the target pressure. Further, the valve body 24 can be made to correspond to a target pressure by using a material having a different thickness or a material having a different elastic force.
Of course, the combination of the valve element 24 and the pressure spring 26 having different characteristics can correspond to the target pressure.

[0015]

Since the outer periphery of the pressure contact projection 28 of the valve body 24 is in contact with the valve port 22 at the tapered portion, the gas venting operation is assured. Gas permeable filter 30
, Liquid and powder are not simultaneously discharged, the function as a capacitor is not impaired, and no other adverse effects are caused.

The pressing spring 26 has a locking claw 33 formed on the outer periphery thereof, and is press-fitted and fixed in the valve fitting recess 21 of the valve body 20, so that the valve element 24 can be integrally mounted, and assembly is easy. It is. Since only the thin pressing spring 26, valve body 24, and filter 30 are attached to the valve body 20, it is small in size.
In addition, a thin safety valve device can be configured.

Since pinpoint pressure is applied at the pressing point 27 of the pressing spring 26, operation loss is small and operation is reliable. The target pressure can be adjusted according to the number of leaf spring portions 37 of the pressing spring 26, the thickness of the valve body 24, the nature of the elastic force of the valve body 24, and the like. Of course, the combination of the valve body 24 and the pressing spring 26 having different characteristics can correspond to the target valve operating pressure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a safety valve device 18 of a main part of a safety valve device for a capacitor according to the present invention.

FIG. 2 is a plan view of FIG.

FIGS. 3A and 3B show different examples of the press contact projection 28 of the valve element 24. FIG. 3A is a cross-sectional view in the case of a conical shape, and FIG. 3B is a cross-sectional view in the case of a semi-spherical shape.

FIG. 4 is a sectional view showing an embodiment of a safety valve device for a capacitor according to the present invention.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is an exploded perspective view of a pressing spring 26, an O-ring 25, a valve body 24, and a filter 30 used in the safety valve device 18 of the present invention.

7A and 7B show different examples of the pressing spring 26, and FIG.
Is a plan view in the case where the leaf spring portion 37 is cross-shaped, and (b) is
FIG. 9 is a plan view in a case where there is one semi-circular plate spring portion 37.

[Explanation of symbols]

10 ... capacitor element, 11 ... capacitor container, 12 ...
Filler, 13: sealing body, 14: throttle groove, 15: folded part, 16: lead wire, 17: terminal, 18: safety valve device,
19 mounting hole, 20 valve body, 21 valve fitting recess, 2
2 ... Valve, 23 ... Screw, 24 ... Valve, 25 ... O-ring, 26 ... Pressing spring, 27 ... Pressing point, 28 ... Press contact protrusion,
29 ... vent, 30 ... filter, 31 ... ridge, 32 ...
Filter retainer, 33: locking claw, 34: notch for spanner, 35: rivet conductor, 36: flange, 37: leaf spring, 38: rubber packing.

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[Procedure amendment]

[Submission date] December 28, 1998 (1998.12.
28)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

Claims (12)

[Claims] 1. A capacitor element 10 impregnated with a filler 12 such as an electrolytic solution is accommodated in a capacitor container 11,
In a capacitor whose opening is closed by a sealing body 13, a safety valve device 18 is mounted in a mounting hole 19 penetrating through the sealing body 13, and the safety valve device 18 is mounted in the mounting hole 19 and fitted with a valve. Joint recess 21 and valve port 22
And an integral press-contacting projection 28 which is fitted into the valve fitting recess 21 to open and close the end of the valve port 22 on the side of the valve fitting recess 21, and has a ventilation hole. 29, a pressure spring 26 for urging the pressure contact protrusion 28 of the valve body 24 toward the valve port 22, and a gas provided on the inner end face side of the valve port 22. A safety valve device for a capacitor, comprising: a filter (30); and an outer periphery of the press contact protrusion (28) being in contact with the valve port (22) at a tapered portion. 2. The capacitor for a capacitor according to claim 1, wherein the pressing spring has a locking claw portion formed on an outer peripheral portion thereof and is press-fitted and fixed in the valve fitting concave portion of the valve body. Safety valve device. 3. The safety valve device 18 is detachably attached to the sealing body 13 by screwing a screw portion 23 of an outer wall of the valve body 20 into a thread groove of an inner wall of the mounting hole 19 of the sealing body 13. Safety valve device for condenser. 4. A safety valve device for a capacitor, wherein a valve body 20 of a safety valve device 18 is fixedly mounted in a mounting hole 19 of a sealing body 13. 5. The safety valve device for a capacitor according to claim 1, wherein the pressure contact protruding portion of the valve body has a tapered portion having a truncated conical shape. 6. The safety valve device for a capacitor according to claim 1, wherein the pressure contact projection 28 of the valve element 24 has a tapered portion formed in a conical shape. 7. The safety valve device for a capacitor according to claim 1, wherein the pressure contact protruding portion of the valve body has a tapered portion formed in a semi-spherical shape. 8. The capacitor safety valve device according to claim 1, wherein the filter 30 is made of a porous material that separates gas and liquid. 9. The pressing spring 26 is formed by extending one or a plurality of leaf spring portions 37 from the pressing point 27 at the center to the outer peripheral edge and bulging the pressing point 27. The safety valve device for a capacitor according to claim 1, wherein 10. The safety valve device for a capacitor according to claim 1, wherein the pressing spring 26 has a disk shape and has a pressing point 27 bulged to one side. 11. The capacitor safety valve device according to claim 1, wherein the valve body 24 has a different thickness so as to correspond to a target permeation pressure. 12. The capacitor safety valve device according to claim 1, wherein the valve body 24 is made of a material having different elasticity so as to correspond to a target permeation pressure.