JPS6041724Y2 - Electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrolytic capacitor that has improved explosion-proof performance and fixed capacitor elements.

A conventional electrolytic capacitor equipped with an explosion-proof mechanism at the bottom of a resin case is one in which a capacitor element 3 is housed in a resin case 2 equipped with an explosion-proof mechanism formed by a thin wall part 1, as shown in FIG. The element 3 has a highly elastic element fixing material 4 such as rubber placed at the bottom of the case 2.
A capacitor element 3 was inserted thereon, a sealing plate 5 was attached to the opening of the case 2 by welding, etc., and the capacitor element 3 was sandwiched and fixed between the sealing plate 5 and the element fixing material 4.

A lead plate led out from the capacitor element 3 is connected to a terminal 7 via a rivet or the like.

The element fixing material 4 disposed at the bottom of the case 2 is shaped like a ring with a hole 6 in the center so that the internal pressure of the capacitor under abnormal conditions is directly applied to the thin wall portion.

However, in the explosion-proof mechanism of the thin-walled part 1 of the resin case 2, the thin-walled part 1 softens due to heat generation of the capacitor element 3 under abnormal conditions and ruptures due to an increase in internal pressure. , there is a space between the capacitor element 3 and the thin part 1, and the heat of the capacitor element 3 is not directly transferred to the thin part 1, so even if the capacitor generates heat under abnormal conditions, the resin in the thin part 1 will not soften. There is a drawback that the explosion-proof function may not be fully achieved if there is too little or too late.

In addition, since the ring-shaped element fixing material 4 is not fixed when inserted into the resin case 2, it may move inside the resin case 2 and be biased toward the edge. However, a part of the capacitor element 3 enters the inner ring of the ring-shaped element fixing material 4, resulting in unstable fixation of the capacitor element 3.

The present invention aims to eliminate the above-mentioned drawbacks and provide an electrolytic capacitor that is inexpensive and extremely superior in terms of safety and vibration resistance.

The present invention will be described below with reference to an embodiment shown in FIG.

Figure 2A is a cross-sectional view of an electrolytic capacitor, and the opening is a bottom view of the same electrolytic capacitor.A thermoplastic resin case 2 made of polypropylene or the like has a protrusion 9 on the bottom inner surface and a recess on the outer surface opposite to the protrusion 9. A circular cylinder 8 having a thin-walled part 1 and a protrusion 9 are provided for the explosion-proof mechanism formed by integrally molding, a capacitor element 3 is housed in the resin case 2, and the opening of the resin case 2 is sealed. The installation is sealed by welding the plate 5.

At this time, the thin portion 1 and the protrusion 9 bite into the bottom surface of the capacitor element 3.

The present invention is constructed as described above, and the circular cylinder 8 and protrusion 9 provided at the bottom of the resin case 2 touch and sink into the bottom surface of the capacitor element 3.
This prevents movement of the material, sufficiently withstands mechanical shock, and provides stable fixation.

In addition, since the protrusions 9 are formed around the thin wall portion 1, the bottom surface of the capacitor element 3 does not come into close contact with the bottom of the resin case 2, and if the capacitor element generates heat under abnormal conditions and the temperature rises, The heat is directly concentrated and transmitted to the thin-walled part 1, softening the resin in the thin-walled part 1 and creating a state where it is easily ruptured due to an increase in internal pressure, resulting in an explosion-proof structure that is highly sensitive to abnormalities, that is, has a wide explosion-proof operation range. .

Further, the shape of the circular cylinder 8 provided with the thin wall portion 1 is not limited to this shape, and may be a rectangular cylinder or a polygonal cylinder.

In addition, the protrusion 9 is connected to the circular cylinder 8, or the resin case 2
It may be formed by being connected to the side of the.

The thin portion 1 may also be provided on the protrusion 9.

As described above, the electrolytic capacitor of the present invention has a thin wall portion 1 and a protrusion 9 on the bottom of the resin case 2, which are soft enough to be softened by heat.
, and at least a part of the thin wall part 1 and the protrusion 9 are embedded and fixed in the capacitor element 3. It has an extremely excellent effect in terms of safety and vibration resistance due to improved explosion-proof performance, and is industrially suitable. It also has great practical value.

[Brief explanation of the drawing]

Figure 1 shows a conventional electrolytic capacitor, A is a cross-sectional view, the opening is a bottom view, and Figure 2 is an example of the electrolytic capacitor of the present invention.
A is a cross-sectional view, and the mouth is a bottom view. 1: Thin wall part, 2: Resin case, 3: Capacitor element, 8
: Circular tube, 9: Convex.

Claims (1)

[Scope of utility model registration request] A circular, square, or polygonal cylinder 8 with a thin wall portion 1 provided inside the bottom of the thermoplastic resin case 2 and a protrusion 9 are integrally formed, and the thin wall portion 1 and the protrusion 9 sink into the capacitor element 3. An electrolytic capacitor characterized by being configured as follows.