JPH0452985Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention was developed to improve electrolytic capacitors.
In particular, it relates to an electrolytic capacitor that suppresses fluctuations in electrical characteristics due to external stress.

[Conventional technology]

Normally, electrolytic capacitors, especially relatively large electrolytic capacitors, contain a capacitor element formed by winding electrode foil and electrolytic paper together with an electrolyte in a cylindrical case with a bottom. The tab is electrically connected to an external connection terminal fixed to the sealing body.

In an electrolytic capacitor with such a structure, when external stress such as vibration is applied to the main body, the contact resistance between the tab and the electrode foil changes, the distance between the electrodes changes, etc.
It may become impossible to maintain the electrical characteristics constant. In particular, when electrolytic capacitors are placed around a speaker network or near a transformer inside an electronic device, it is difficult to obtain the desired characteristics due to the low frequencies generated by these peripheral components, even if the fluctuations are slight. There are cases.

Conventionally, in order to correct such inconveniences, an element fixing agent was housed inside the outer case along with the capacitor element to firmly fix the element, or the element was wound more tightly than usual to reduce the effects of external stress such as vibration. I'm trying to reduce it as much as possible.

[Problem that the invention attempts to solve]

However, if the element fixing agent is housed in the outer case along with the capacitor element, the manufacturing process is complicated, and in the case of electrolytic capacitors with an explosion-proof valve formed on the bottom of the outer case, the operating performance will not be impaired. do not have. Furthermore, it becomes difficult to sufficiently release the heat generated from the capacitor element, and as a result, the life characteristics of the electrolytic capacitor are adversely affected.

Alternatively, it is possible to form the diameter of the outer case close to the diameter of the capacitor element and fix the element with the outer case itself, but this does not suppress the vibration itself, and the hydrogen generated from the capacitor element This is not an appropriate method since it is not possible to secure a space to accommodate the gas.

[Means for solving problems]

As shown in the drawings, this invention is characterized in that elastic rubber bodies 8 and 9 that cover at least the side surfaces of the outer case 2 are arranged in the gap between the outer case 2 and the outer sleeve 6 that covers the outer case 2. There is.

[Effect]

In this invention, since the elastic rubber body 8 is installed on the side surface of the outer case 2, external vibrations such as low frequencies are absorbed by the elastic rubber bodies 8 and 9, and the conduction to the capacitor element 1 is suppressed. can do.

〔Example〕

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a first embodiment of this invention, in which a tab 5 led out from a capacitor element 1 is shown.
is electrically connected to an electrode foil (not shown) and is also connected to an external connection terminal 3 fixed to the sealing body 4 in advance. In addition, capacitor element 1
is housed in an exterior case 2 having a groove-shaped explosion-proof valve 7 formed on the outer bottom surface, and its open end is sealed with a sealing body 4.

An elastic rubber body 8 made of elastic rubber and formed into a flat plate, as shown in FIG. 2, is brought into contact with the side surface of the exterior case 2 so as to surround the exterior case 2. Thereafter, the outer surface of the outer case 2 is covered with an outer sleeve 6 made of vinyl chloride or the like together with the elastic rubber body 8 to obtain an electrolytic capacitor according to the first embodiment.

According to this first embodiment, external vibrations such as low frequencies are absorbed by the elastic rubber body 8 made of an elastic rubber plate arranged on the side surface of the electrolytic capacitor, and the influence on the capacitor element 1 is suppressed. I can do it.

Further, the elastic rubber body that surrounds and abuts on the side surface of the outer case 2 may be an elastic rubber body 9 previously formed into a cylindrical shape as shown in FIG.

In this case, the elastic rubber body 9 covers the entire circumference of the side surface of the outer case 2, making it easier to absorb vibrations compared to the first embodiment.

[Effect of idea]

As described above, this invention is characterized by disposing an elastic rubber body that covers at least the side surface of the outer case in the gap between the outer case and the outer sleeve that covers the outer case. is absorbed by the elastic rubber body, and the influence on the capacitor element can be suppressed. Therefore, fluctuations in electrical characteristics due to vibration are reduced, and it becomes easy to maintain constant characteristics without being affected by the environment in which the electrolytic capacitor is placed.

In addition, since there is no need to inject a fixing agent into the electrolytic capacitor as in the past, the manufacturing process is simplified, and if the explosion-proof valve is placed on the bottom of the outer case, its operating ability will not be impaired. It disappears.

Further, since the elastic rubber body is arranged on the side surface of the outer case, it is easy to prevent damage to the outer sleeve due to external impact.

As described above, this invention is a useful invention in which an elastic rubber body is interposed in the gap between the side surface of the exterior case and the exterior sleeve to suppress fluctuations in electrical characteristics due to vibration.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a first embodiment of this invention, Fig. 2 is a perspective view showing an elastic rubber body used in the first embodiment of this invention, and Fig. 3 is a sectional view showing a first embodiment of this invention. FIG. 2 is a perspective view showing an elastic rubber body used in Example 2. In the drawings, common parts and parts are designated by common reference numerals. 1...Capacitor element, 2...Exterior case, 3
...External connection terminal, 4... Sealing body, 5... Tab,
6... Exterior sleeve, 7... Explosion-proof valve, 8, 9...
Elastic rubber body.

Claims (1)

[Scope of utility model registration request] An electrolytic capacitor characterized in that an elastic rubber body that covers at least a side surface of the outer case is disposed in a gap between an outer case and an outer sleeve that covers the outer case.