JPS5969904A - capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a capacitor, and particularly to a capacitor suitable for use in domestic well pumps and the like.

[Prior art]

Capacitors are known in which a capacitor element is made by winding a metallized plastic film or metallized paper, and this capacitor element is housed in a resin case, filled with resin, and sealed, or a capacitor in which the above-mentioned capacitor element is covered with a resin mold. It is being

However, in the structure of the above capacitor, if a part of the dielectric film or paper becomes extremely deteriorated, the current will concentrate and flow in the deteriorated part, exceeding the allowable limit of the capacitor element, causing a puncture, and causing damage to the resin case and the like. This had the disadvantage that the exterior of the resin mold would break, the wax or other impregnating agent would scatter, and the capacitor would burn.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a capacitor that has a self-safety function that can prevent combustion of the capacitor.

[Summary of the invention]

The present invention is characterized by a capacitor element made of a capacitor element material such as metallized glass film or metalized paper, a metallicon part applied to the end face of the capacitor element, and an end connected to the metallicon part. In the case where the terminal is provided with a current interrupting part,
This is a capacitor designed to cut off current from an external circuit when gas is generated from the capacitor element material.

[Embodiments of the invention]

An embodiment of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view of a capacitor showing one embodiment of the present invention. The capacitor element 1 is constructed by winding a capacitor element material such as a metallized plastic film or metallized paper alone, or by winding it together with a non-metalized plastic film or non-metalized paper.

The capacitor element 1 is provided with metallic contact portions 2 and 3 at the lower end portions of both end faces thereof. The ends 6 and 7 of the terminals 4 and 5 are attached to the metal contact parts 2 and 3, respectively.
Multiple connections are made by soldering using solder with a high melting point of 00C or higher.

A current interrupting part 8 that interrupts the current from the outside when gas is generated from the capacitor element material between the terminals 4 and 5.
and 9 are provided. These current interrupting parts 8 and 9
As shown in FIG. 2, the terminals 4 and 5 are formed with triangular notches on both sides to make the widths of the terminals 4 and 5 particularly narrow. Further, the current interrupting portions 8 and 9 are provided above the metallic contact portions 2 and 3 and near the winding core 10 of the capacitor element 1.

The capacitor element 1 is covered with an outer device 1 molded with polypropylene or polyethylene resin.

In this embodiment, when a part of the capacitor element material such as a metallized plastic film or metallized paper constituting the capacitor element 1 deteriorates, current flows concentratedly in the deteriorated part.

For this reason, the temperature of the deteriorated part increases and the capacitor element 1
The gas contained in it expands. This expanded gas is
It attempts to exit through the end face of the capacitor element, particularly through the winding core 10.

At this time, the current interrupting parts 8 and 9 of the terminals 4 and 5 are pushed outward, and as shown in FIG. .

Therefore, by disconnecting the current interrupting parts 8 and 9 of the terminals 4 and 5, it is possible to prevent the temperature of the capacitor element 1 from rising, and the flow of current from the external circuit is interrupted, thereby preventing combustion of the capacitor element 1 and the external device 1. A capacitor is obtained.

In addition, since solder with a high melting point of 200U or more was used to connect the ends 6 and 7 of the terminals 4 and 5 to the metallicon parts 2 and 3, the current interrupting parts 8 and 9 could be easily cut. did it.

Other embodiments of the present invention will be described. In FIG. 4, the terminal 41 is provided with two current interrupting portions 42 and 43 in triangular notches from both sides. In this way, two or more current interrupting portions may be provided. In this case, there is an effect that the current interrupting portion of the terminal can be easily disconnected.

Further, other embodiments of the present invention will be described.

In FIG. 5, a terminal 51 has a current interrupting portion 52 using a wire material having low mechanical strength at its tip. In this case, when the wire that is the current interrupting part reaches the required temperature,
Effective for reliable cutting.

Other embodiments of the present invention will be described. In FIG. 6, the thickness of the exterior 63 near the current interrupting portion 62 of the terminal 61 is reduced. In this case, the current interrupting portion 62 of the terminal 61 can cut the current more effectively.

Note that the shape of the cutout of the current interrupting portion of the terminal is not limited to a triangular shape as in the embodiment, but may be any shape such as a semicircle or an ellipse.

Further, in forming the current interrupting portion of the terminal, the portion of the terminal corresponding to the current interrupting portion may be formed with a thinner wall.

Furthermore, when connecting the end of the terminal to the metal contact part, 2
Although it is easier to disconnect the current interrupting portion of the terminal by using solder with a high melting point of 00R or more, it is also possible to connect with a solder other than such a high melting point solder.

Further, other embodiments of the present invention will be described.

In FIGS. 7 to 9, the capacitor element 81 is
Metallicon portions 82 and 83 are provided over almost the entire surface of both side surfaces. This meta 937 parts 82 and 83
Terminals 84 and 85 are connected by solder or the like.

K in the middle of terminals 84 and 85, current interrupting parts 86 and 8
7 is provided. The current interrupting portions 86 and 87 have a particularly narrow width, as shown in FIG.

Insulating plates 88 and 89, such as baking plates, are provided between the terminals 84 and 85 and the metallic contact portions 82 and 83 so as to be sandwiched therebetween. Insulating plates 88 and 89 have portions opposite terminals 84 and 85 connected to terminals 84 and 85.
It extends below the current interrupting parts 86 and 87 of 5. The capacitor element 81 has a resin-molded exterior 9o.
covered by.

In this embodiment, when a portion of the metallized plastic film or metalized paper constituting the capacitor element 81 deteriorates, current flows concentratedly in the deteriorated portion.

For this reason, the temperature of the deteriorated portion increases and the capacitor element 8
The gas contained in 1 expands. This expanded gas tends to exit through the end face of the capacitor element, particularly through the core.

At this time, insulating plates 88 and 89 and terminals 84 and 8
The current interrupting portions 86 and 87 of No. 5 are pressed outward, and as shown in FIG. 9, the current interrupting portions 86 and 87 are cut off.

When the current interrupting parts 86 and 87 are cut, the insulating plate 88
and 89, the disconnected terminals 84 and 85 do not come into contact with the metallic contact portions 82 and 83 again, and the inflow of current from the external circuit is completely blocked.

In this embodiment, a capacitor is obtained which can prevent the temperature of the capacitor element from rising, which can prevent the capacitor element and the exterior from burning, and which can also prevent the terminals from coming into contact again after cutting the insulating plate multiple times.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a capacitor element made of a capacitor element material such as a metallized plastic film or metallized paper, a metallicon portion provided on an end surface of the capacitor element, and an end portion formed on the metallicon portion. The terminal is equipped with a current cutoff part, which cuts off the current from the external circuit when gas is generated from the capacitor element material.
A capacitor having a self-safety function capable of preventing combustion of the capacitor was obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a capacitor showing an embodiment of the present invention, FIG. 2 is a side sectional view taken along line II-[ of FIG. 1, and FIG. 3 is a capacitor shown in FIG. Figures 4 and 5 are cross-sectional views of capacitors showing other embodiments of the terminals, Figure 6 is a cross-sectional view of other embodiments of the terminals and the exterior, and Figure 7 8 is a longitudinal cross-sectional view of a capacitor having an insulating plate showing another embodiment of the present invention, FIG. 8 is a side cross-sectional view taken along the line ■-■ in FIG. 7, and FIG. FIG. 3 is a cutaway diagram of the terminals and exterior of the capacitor. 1.81... Capacitor element, 2, 3, 82.83.
... Metallicon part, 4, 5, 41, 51, 6L. 84.85...Terminal, 8, 9, 42, 43, 52°6
2.86.87... Current interrupting part, 88.89... Insulating plate. Figure 3 Figure 4I-Figure 7 Figure ff18 Figure W

Claims (1)

[Scope of Claims] 1. A capacitor element made of metallized plastic film or metallized paper near the capacitor winding core, a metallicon part provided on the end face of the capacitor element, and an end connected to the metallicon part. 1. A capacitor comprising a terminal, characterized in that the terminal is provided with a current interrupting portion to interrupt current from an external circuit when gas is generated from the capacitor element material. 2. The capacitor according to claim 1, wherein the current interrupting portion of the terminal is provided near the capacitor winding core. 3. The capacitor according to claim 1, wherein the current interrupting portion of the terminal is a notch. 4. The capacitor according to claim 1, wherein the current interrupting portion of the terminal is a wire with low mechanical strength provided at the tip of the terminal. 5. A capacitor element made of a capacitor element material such as a metallized plastic film or metallized paper, a metallicon part applied to the end face of this capacitor element, and a terminal whose end is connected to the metallicon part, A current interrupting part is provided in the terminal, and an insulating plate is provided between the metallic contact part and the terminal.1. A capacitor characterized in that when gas is generated from a capacitor element material, a current interrupting part of a terminal interrupts current from the outside and prevents the terminal from coming into contact with an insulating plate. 6. The capacitor according to claim 5, wherein at least the portion of the insulating plate that faces the current interrupting portion of the terminal extends below the current interrupting portion of the terminal.