JP2001230161A - Pressure regulating valve and capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor which can realize highly reliable adjustment of gas pressure with a simple structure, as well as a long service life through the adjustment of gas within a container. SOLUTION: A gate cylinder (18) is provided to a container filled with a gas which is communicated with an outside air, and it is covered with a cap (26) to a block a gate hole (20), and then the pressure of a gas on the gate hole is applied to the inner side of the cap through a gas purging part (notch part 22 and through hole 24), thereby purging the gas to the outside air through a clearance between the cap and gate cylinder. Thus, the gas can be purged in accordance with an increase of inner pressure of gas without reducing the sealing of the container, and furthermore a highly reliable adjustment of pressure, avoiding bursting, and a long service life of a capacitor can be also realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulating valve and a condenser having a function of adjusting a gas pressure filled in a container and an explosion-proof function.

[0002]

2. Description of the Related Art An electrolytic capacitor is formed by sealing a capacitor element impregnated with an electrolytic solution in a container, and when energized, performs an electrolytic action and generates a gas such as hydrogen. This gas fills the inside of the container that seals the capacitor element, and when a high current flows, the amount of generated gas becomes remarkable, and the capacitor may be rapidly deformed. In order to avoid such deformation, an explosion-proof valve is installed, and the explosion-proof valve is opened to gently open the container to the outside air, thereby preventing scattering of the electrolytic solution, deformation of the container, and the like. Such an explosion-proof measure is also applied to an electric double layer capacitor.

[0003]

By the way, the container accommodating the capacitor element has a fixed volume, and the generated gas is filled in proportion to the use time, so that the explosion-proof valve is easily opened and the use of the capacitor is prevented. There was a disadvantage that the time was shortened. In particular, when the capacitor element is set to be large for a small container due to a demand for miniaturization, the allowable space for gas becomes narrow, and the tendency to shorten the life is enhanced.

[0004] In addition to such a container for a condenser, in a hermetically sealed container filled with generated gas, highly reliable pressure adjustment is required to prevent deformation.

Accordingly, the present invention provides a pressure regulating valve which realizes highly reliable gas pressure adjustment with a simple structure,
It is an object of the present invention to provide a capacitor having a longer life by adjusting the pressure in the container.

[0006]

SUMMARY OF THE INVENTION The present invention provides a pressure regulating valve and a condenser using the pressure regulating valve, and its basic structure is a gas-filled container (4).
A gate cylinder (18) that communicates with the outside air is formed on the gate cylinder, a cap body (26) is put on the gate cylinder to close the gate hole (20), and the pressure of the gas acting on the gate hole is reduced by a gas vent (notch 22, By acting on the inner surface side of the cap body through the through hole 24), gas can be vented to the outside air from the gap between the cap body and the gate cylinder. Therefore, since the gas can be vented according to the increase in the internal pressure of the gas without lowering the sealing performance of the container, the pressure can be adjusted with high reliability, and the risk of the capacitor being deformed can be avoided. In this case, the life can be extended.

According to the first aspect of the present invention, a pressure regulating valve according to the present invention comprises a container (4) filled with gas, a gate tube (18) for allowing the container to communicate with the outside air, and a side wall portion covered by the gate tube. A cap body (26) that adheres with elastic force and closes the gate hole (20); and a gas vent formed on the top or side of the gate cylinder covered with the cap body and communicating with the gate hole. (Notch 22, through-hole 24)
By applying the pressure of the gas acting on the gate hole to the inside of the cap body through the gas venting part, gas is vented to the outside air from a gap between the cap body and the gate cylinder. It is characterized by the following.

That is, the gas filled in the container acts on the gate hole and the gas vent. Gate holes and gas vents
Although it is closed by the cap body covered by the gate cylinder, the gas vent is different from the gate hole on the inner surface side of the cap body. For this reason, the gas pressure acting on the gas vent acts in the direction of expanding the cap body in the diameter direction. When the gas pressure in the container rises and the cap body is expanded by overcoming the elastic force of the cap body, the gas in the vessel is discharged from the gap between the cap body and the gate cylinder. When the internal pressure decreases due to the discharge, the cap body contracts due to the elastic force, and returns to a pressure state in which the elastic force before the rise prevails.
As described above, the pressure in the container is adjusted by the balance between the sealing force with the gate cylinder and the pressure in the container due to the degree of contraction of the cap body, and deformation of the capacitor is avoided.

According to a second aspect of the present invention, a pressure regulating valve according to the present invention is characterized in that a thin portion (28) is formed in the cap body that closes the gate hole, and can be opened by the action of a steep gas pressure. That is, when a sudden gas is generated and the internal pressure of the container rises sharply, the thin portion of the cap body is broken apart from the pressure adjusting action and the valve is opened, thereby preventing deformation of the capacitor.

According to a third aspect of the present invention, there is provided a pressure regulating valve according to the present invention, wherein holding means (washer 3) for holding the cap body in the container is provided.
8). That is, when the cap body is put on the gate cylinder, the cap body may fall off from the gate cylinder due to the pressure of the gas acting on the gate hole. Therefore, by holding the cap body in the container by the holding means, it is possible to prevent the cap body from being detached when the pressure is rapidly increased.

According to a fourth aspect of the present invention, a capacitor (sealing plate 8) for closing a container (4) containing a capacitor element (6) is provided on the sealing member to allow the container to communicate with the outside air. A gate cylinder (18) to be covered, a cap body (26) covered by the gate cylinder to adhere to the side face thereof with elastic force and to close the gate hole, and a top side of the gate cylinder covered by the cap body Alternatively, a gas vent portion (notch portion 22,
Through the gas vent acting on the inside of the cap body through the gas venting portion, so that the gas is released from the gap between the cap body and the gate cylinder to the outside air. It is characterized by degassing.

That is, a metal container made of aluminum or the like is generally used as the container of the capacitor, and is opened for convenience of inserting the capacitor element, and the container is sealed with a sealing member made of rubber or synthetic resin. . In this case, a pressure regulating valve is provided on the sealing member. Therefore, gas generated from the capacitor element in the container fills the container, and the gas acts on the gate hole and the gas vent. The gate hole and the gas venting part are closed by a cap body covered by the gate cylinder, but the gas venting part is located on the inner surface side of the cap body unlike the gate hole. For this reason, the gas pressure acting on the gas vent acts in the direction of expanding the cap body in the diameter direction. When the gas pressure in the container rises and the cap body is expanded by overcoming the contraction force of the cap body, the gas in the vessel is discharged from the gap between the cap body and the gate cylinder. When the internal pressure decreases due to the discharge, the cap body contracts due to the elastic force, and returns to a pressure state where the elastic force before the rise prevails. As described above, the pressure in the container is adjusted by the balance between the sealing force with the gate cylinder and the pressure in the container due to the degree of contraction of the cap body, and deformation of the capacitor is avoided.
As a result, the life of the capacitor is extended.

According to a fifth aspect of the present invention, there is provided a capacitor according to the present invention, wherein the cap body is formed of an elastic material having a moisture blocking property such as butyl rubber. That is, in a capacitor such as an electric double-layer capacitor in which the function of the capacitor is degraded due to intrusion of moisture, the cap body is formed of an elastic material having a high moisture barrier property such as butyl rubber, thereby preventing the penetration of moisture and deteriorating characteristics. Can be prevented, and a decrease in reliability can be prevented.

[0014]

1 and 2 show an embodiment of a pressure regulating valve and a condenser according to the present invention. Capacitor 2
Is an electrolytic capacitor, for example, in which a capacitor element 6 is inserted into a container 4 formed of a metal such as aluminum, and the container 4 is sealed by a sealing plate 8 as a sealing member. That is, the container 4 is a sealed container, and in this embodiment, the sealing plate 8 is formed of a hard synthetic resin plate, and the sealing property between the container 4 and the sealing plate 8 is increased. The high elastic material is used for the seal member.

The sealing plate 8 is provided with external terminals 10 and 12 connected to the anode or cathode side electrode foil of the capacitor element 6 and a pressure regulating valve 14. The pressure regulating valve 14 is configured as shown in FIGS. That is, for example, a circular recess 16 is formed in a part of the sealing plate 8, and a cylindrical gate tube 18 is formed inside the recess 16, and the gate tube 18 communicates with the front and back surfaces of the sealing plate 8. A gate hole 20 is formed, and the container 4 communicates with the outside air through the gate hole 20. At the top of the gate cylinder 18, a notch 22 is formed as a gas vent. Instead of the notch 22, a through hole 24 may be formed in the groove or the side surface of the gate cylinder 18 to serve as a gas vent.

The gate cylinder 18 is covered with a cap 26, and the gate hole 20 and the notch 22 are closed by the cap 26. The cap body 26 is, for example, a cylindrical body having a U-shaped cross section, and has a thin portion 28 on the top side.
The inner wall of the cap body 26 is set to be smaller than the outer diameter of the gate cylinder 18. That is, the cap body 26 is made of an elastic material having a high moisture-blocking property such as butyl rubber, and is covered in close contact with the gate cylinder 18 with elasticity due to its elastic force. A gap 34 is formed between the outer peripheral portion of the cap body 26 and the inner peripheral portion of the concave portion 32 and smaller than the inner diameter of the concave portion 16. The depth of the concave portion 32 of the cap body 26 is slightly smaller than the entire length of the gate cylinder 18, and a gap 36 is formed between the lower end surface of the thick portion 30 of the cap body 26 and the bottom surface 35 of the concave portion 16. I have. That is, the gaps 34 and 36 communicate with each other.

A washer 38 made of a metal plate is fitted into the concave portion 16 as a holding means having a function of preventing the cap body 26 from coming off by utilizing its elasticity, and an annular portion 40 of the washer 38 is fitted to the cap body. 26 is in contact with the upper surface. In this washer 38, a plurality of locking pieces 42 are formed radially around an annular portion 40, and a central through hole 4 is formed.
4 is for facilitating breakage of the thin portion 28 of the cap body 26. Note that, instead of the washer 38, a protrusion or the like may be provided on the sealing plate 8 side to strengthen the holding of the cap body 26.

According to such a configuration, at the time of energization, the gas G such as hydrogen generated from the capacitor element 6 fills the inside of the container 4 and raises the internal pressure in the container 4.
And acts on the thin portion 28 of the cap body 26 through the notch 22 and in the diametrical direction of the cap body 26. The cap 26 is in close contact with the gate cylinder 18 by utilizing its elasticity, and the adhesion depends on the inner diameter of the cap 26 with respect to the outer diameter of the gate cylinder 18. The gas pressure acting on the notch 22 acts in a direction to expand the cap body 26 in the diameter direction. Also in the case of the through hole 24, it acts in the direction of expanding the cap body 26. When the gas pressure in the container 4 rises and the cap body 26 is pushed open by overcoming the adhesive force with the gate cylinder 18 due to the contraction force of the cap body 26, a gap is generated between the cap body 26 and the gate cylinder 18. Gas G in the container 4 from the gap
Are discharged from the gaps 34 and 36 to the outside air. Cap body 2
Since the washer 38 for holding 6 has an interval on the side of the locking piece 42, the washer 38 does not hinder degassing. Then, when the internal pressure of the container 4 decreases due to the discharge of the gas G, the cap body 26 contracts and returns to the pressure state before the pressure increase. As described above, the pressure in the container 4 is adjusted by the balance between the sealing force with the gate cylinder 18 due to the degree of contraction of the cap body 26 and the internal pressure of the container 4, thereby preventing the capacitor 2 from being deformed.
As a result, the life of the capacitor 2 is extended.

In the pressure regulating valve 14, a thin portion 28 is formed in a cap body 26 for closing the gate hole 20, and the thin portion 28 is opened by a steep gas pressure. That is,
When a sudden gas G is generated and the internal pressure of the container 4 rises sharply, the thin portion 28 of the cap body 26 is provided separately from the pressure adjusting operation.
Is broken, and the pressure regulating valve 14 is opened, thereby preventing the capacitor 2 from being deformed.

It is expected that the thin portion 28 of the cap body 26 will bulge upward by the action of pressure.
As a result of the cap body 26 being accommodated within the wall thickness of the upstanding wall 46 and the sealing plate 8 itself, the thin portion 28 is protected.

Further, if the cap body 26 is formed of an elastic material having a high moisture-blocking property such as butyl rubber, the invasion of moisture from the outside can be prevented, and in an electric double layer capacitor or the like, the deterioration of the capacitor function due to moisture is prevented. Prevention can be achieved.

In place of the notch 22, the gate cylinder 18
When the through hole 24 is formed in the middle of the
The cap body 26 is pushed open by the pressure acting through the container 4, the gas in the container 4 is vented, and the pressure of the container 4 can be adjusted.

As shown in FIGS. 5A, 5B and 5C, the notch 22 formed at the top of the gate cylinder 18 has a notch width a, a notch depth b and an extension. The operating pressure of the pressure regulating valve 14 can be changed by increasing or decreasing the opening area of the cutout portion 22 by changing the above. That is, in the case of (A), the operating pressure is high because the opening area is small, and in the case of (C), the operating pressure is low because the opening area is large. In the case of (B), the operating pressure is lower than in the case of (A). It becomes larger than the case of (C).

In the above-described embodiment, the pressure regulating valve 14 is provided on the sealing plate 8. However, the pressure regulating valve 14 may be provided on the container 4 itself. A holding means such as a protrusion may be provided on the fourth side.

In the above embodiment, the capacitor 2
Although the case where the pressure regulating valve 14 is installed has been described, the pressure regulating valve of the present invention is not limited to a condenser because it can be used for regulating the pressure of various closed containers in which the internal pressure increases.

[0026]

As described above, according to the present invention,
The following effects are obtained. a The gas filling the container can be discharged according to the rise in the pressure in the container, and the pressure in the container can be suppressed to prevent deformation of the capacitor. (b) When a gas is suddenly generated and the pressure in the container is rapidly increased, the thin portion is broken, and deformation of the capacitor can be prevented. c the cap body is held by the holding means from the container,
The cap body can be prevented from coming off from the gate cylinder, and a highly reliable pressure adjustment function and explosion-proof function can be maintained. d In the condenser, the gas filling the container can be discharged according to the rise in the pressure in the container, and the pressure in the container can be suppressed to prevent deformation of the capacitor. e Since the cap body is formed of an elastic material having a high moisture-blocking property such as butyl rubber, the penetration of moisture into the container can be suppressed, the deterioration of the capacitor function can be prevented, and the deterioration of reliability can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a condenser shown as an embodiment of a pressure regulating valve and a condenser of the present invention.

FIG. 2 is a partial sectional view of a capacitor.

FIG. 3 is an enlarged sectional view of a pressure regulating valve.

FIG. 4 is an exploded perspective view of the pressure regulating valve with a part cut away.

FIG. 5 is a perspective view showing a modified example of the cutout portion of the gate cylinder of the pressure regulating valve.

[Explanation of symbols]

 G Gas 2 Capacitor 4 Container 6 Capacitor element 8 Sealing plate (sealing member) 14 Pressure regulating valve 18 Gate cylinder 20 Gate hole 22 Notch (gas vent) 24 Through-hole (gas vent) 26 Cap 28 Thin part 38 Washer ( Holding means)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Sasaki 1-167-1, Higashi-Ome, Ome-shi, Tokyo Nippon Chemi-Con Corporation (72) Inventor Masayuki Mori 1-167, Higashi-Ome 1-chome, Ome-shi, Tokyo Nippon Chemi-Con Co., Ltd. (72) Inventor Hideki Shibuya 8, Fujisawa City, Kanagawa Prefecture

Claims (5)

[Claims] 1. A gas-filled container, a gate tube that allows the container to communicate with the outside air, a cap body that is placed over the gate tube, adheres to the side surface thereof with elastic force and closes the gate hole, and A gas vent formed on the top or side of the gate cylinder covered with a body and communicating with the gate hole, and the pressure of the gas acting on the gate hole is passed through the gas vent. A pressure regulating valve, wherein gas is released to the outside air from a gap between the cap body and the gate cylinder by acting on the inside of the cap body. 2. The pressure regulating valve according to claim 1, wherein a thin portion is formed in the cap body that closes the gate hole, and can be opened by a steep gas pressure. 3. The pressure regulating valve according to claim 1, further comprising holding means for holding the cap body in the container. 4. A sealing member for closing a container containing a capacitor element, a gate tube provided on the sealing member to allow the container to communicate with the outside air, and a tightly attached side surface of the gate tube with elastic force. And a gas vent portion formed on the top or side of the gate cylinder covered with the cap and communicating with the gate hole. A capacitor, characterized in that gas is released from the gap between the cap body and the gate cylinder to the outside air by applying the pressure of the acting gas to the inside of the cap body through the gas vent portion. 5. The capacitor according to claim 4, wherein said cap body is formed of an elastic material having a moisture barrier property such as butyl rubber.