JPH0423302Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a multiple capacitor suitable as a high voltage capacitor for various AC high voltage capacitors or surge absorption elements for power transmission and distribution, for improving high voltage capacity distribution, for laser power supply, etc. Among a plurality of capacitors connected in series, at least one set of adjacent capacitors is connected by a flexible conductive wire, and at least the capacitors located at both ends are flexible by fixing terminal fittings to the open electrodes. Flexibility is provided by flexible conductive wires, and misalignment between capacitors can be corrected.The whole can be integrally molded with insulating resin, and residual stress distortion is alleviated, allowing for proper insulation. This is to ensure durability.

BACKGROUND TECHNOLOGY As shown in FIG. 5, a conventional multiple capacitor of this type has electrodes 2 and 3 adhered to both end faces in the axial direction of a dielectric ceramic 1 formed in the shape of a short cylinder. , a female threaded terminal fitting 4 is placed on the surface of the electrodes 2 and 3.
and a plurality of capacitors A ₁ and A ₂ in which the terminal fittings 5 with male screws are bonded and fixed by conductive adhesives 6 and 7 such as solder, are connected to the female screw portion 41 of the terminal fitting 4 and the male screw portion 51 of the terminal fitting 5. The structure is such that the screw connection is mechanically performed by screwing, and the entire body is covered with an insulating resin 8 such as epoxy resin, except for the connecting portions of the female screw portion 41 and the male screw portion 51.

Problems to be solved by the invention However, the conventional multiple capacitors A ₁ and A ₂ described above are connected to terminal fittings 4 and 5.
Since the structure is mechanically connected by , there is almost no flexibility. Therefore, the following problems arise.

(a) If the mounting positions of the terminal fittings 4 and 5 of capacitors A ₁ and A ₂ are misaligned, as shown in Figure 6, the core O _{1 of capacitor A 1 and} the core O ₂ of capacitor A ₂ are aligned with the center of Δd. They are combined with some misalignment.
Therefore, as shown in FIG.
When molding with an insulating resin is carried out by putting it in a mold, there is a problem that the above-mentioned misalignment prevents it from entering the mother mold 9, making it difficult to perform the insulating resin molding operation.

(b) If the core is forcibly inserted into the matrix 9 and insulating resin molding is performed with the center misaligned, residual stress distortion will occur after molding, resulting in interfacial peeling of the insulating resin 8 and a decrease in dielectric strength voltage. etc. are invited.

(c) If the core is coated with the insulating resin 8 in a state where the core is misaligned, there will be variations in the coating thickness of the insulating resin 8, and there will be problems such as dielectric breakdown occurring at thinner parts.

(d) In order to solve the above-mentioned problems, it is necessary to apply insulating resin 8 to the plurality of capacitors A ₁ and A ₂ individually and then connect them at the terminal fittings 4 and 5. This results in an increase in the number of insulating resin molding steps, an increase in costs, and a decrease in dielectric strength.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the multiple capacitor according to the present invention is constructed by arranging in series a plurality of capacitors each having electrodes on two opposing sides of dielectric ceramic. The opposing electrodes are electrically connected to each other,
Among the plurality of capacitors, at least one set of adjacent capacitors has opposing electrodes connected by a flexible conductive wire, and at least two capacitors located at both ends have terminal fittings fixed to the open electrodes. , the terminal fitting is entirely molded with an insulating resin, except for a part of the terminal fitting.

Function In the multi-capacitor according to the present invention, when a plurality of capacitors in which electrodes are provided on two opposing surfaces of dielectric ceramic are connected in series, at least one set of adjacent capacitors among the plurality of capacitors is connected in series. Since they are connected by a flexible conductive wire, even if misalignment occurs between a pair of capacitors connected to the flexible conductive wire, the misalignment can be corrected by the bending of the flexible conductive wire. It can be fixed. Therefore, the whole can be placed in a mother mold and integrally molded with insulating resin.

Moreover, the positioning of the capacitor within the mother mold is performed very accurately, and at the same time, the seating is stable.
Inclination is prevented, the thickness of the insulating resin coating becomes constant, and the withstand voltage characteristics are stabilized.

In addition, since the misalignment between capacitors is corrected by the bending of the flexible conductive wire, no force that would cause residual stress distortion is applied to the capacitor, making it possible to ensure the specified dielectric strength. .

Embodiment FIG. 1 is a sectional view of a multiple capacitor according to the present invention. In the figure, the same reference numerals as in FIG. 5 indicate the same components. In this embodiment, two capacitors A ₁ and A ₂ are connected in series, each having electrodes 2 and 3 adhered to two opposing surfaces of a dielectric ceramic 1 formed in the shape of a short cylinder. . The capacitors A ₁ and A ₂ have opposite electrodes 3-
The two are connected by a flexible conductive wire 10. Further, terminal fittings 4 and 5 are fixed to the open side electrode 2 of the capacitor A ₁ and the open side electrode 3 of the capacitor A ₂ with conductive adhesives 6 and 7 such as solder.
The entire structure is molded with an insulating resin 8 such as epoxy resin, except for the connecting end surfaces of the terminal fittings 4 and 5.

When the capacitors A ₁ and A ₂ are connected by the flexible conductive wire 10, even if misalignment occurs between the capacitors A ₁ and A ₂ , the misalignment can be corrected by bending or deflecting the flexible conductive wire 10. It can be absorbed by Therefore, as shown in FIG. 2, the entire structure can be placed in a predetermined position on the matrix 9 and integrally molded with insulating resin. In addition, the capacitors A ₁ and A ₂ are accurately positioned within the matrix 9, and at the same time, the seating is stable, tilting, etc. is prevented, and the coating thickness of the insulating resin 8 on the capacitor assembly is kept constant. , the withstand voltage characteristics are stabilized.

Furthermore, since the misalignment between the capacitors A ₁ and A ₂ is corrected by the bending and deflection of the flexible conductive wire 10, a force that causes residual stress distortion is applied to the capacitors A ₁ and A ₂ . This also eliminates the need for dielectric strength, making it possible to maintain a predetermined dielectric strength.

FIGS. 3 and 4 show embodiments of multiple capacitors in which three or more capacitors are connected in series. In FIG. 3, all capacitors A ₁ to _{A 3} are connected by a flexible conductive wire 10, and electrodes 2 on the open side of capacitors A ₁ and A ₃ located at both ends,
It has a structure in which terminal fittings 4 and 5 are respectively fixed to 3.

In the embodiment of FIG. 4, a set of capacitors A ₂ ,
A ₃ is connected by a flexible conductive wire 10, and capacitor A ₁ and capacitor A ₂ are connected by terminal fittings 5 and 4. Capacitor A ₁ and capacitor A ₃ located on both ends have terminal fittings 4,
5 are fixed to each.

Also in the case of these embodiments, the flexible conductive wire 10
As a result, the misalignment of the capacitors A ₁ to _{A 3} can be corrected, and similar effects can be obtained.

Effects of the Invention As described above, the multiple capacitor according to the present invention is constructed by arranging a plurality of capacitors in series with electrodes provided on two opposing surfaces of dielectric ceramic and electrically connecting the opposing electrodes to each other. Among the plurality of capacitors, at least one set of adjacent capacitors has opposing electrodes connected by a flexible conductive wire, and at least two capacitors located at both ends have terminal fittings connected to the open electrodes. is fixed, and the entire terminal fitting is molded with insulating resin except for a part of the terminal fitting, so that the following effects can be obtained.

(a) Since the misalignment between capacitors can be absorbed by the bending and deflection of the flexible conductive wire, the whole can be placed in a matrix and molded integrally with insulating resin. The process is simplified.

(b) At the same time, the capacitor is accurately positioned within the matrix, the seating is stable, tilting, etc. is prevented, the thickness of the insulating resin coating is constant, and the withstand voltage characteristics are stable.

(c) Forces that would cause residual stress distortion are no longer applied to the capacitor, making it possible to secure the specified dielectric strength.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a multiple capacitor according to the present invention, Figure 2 is a diagram showing the insulating resin molding process of the multiple capacitor according to the present invention, and Figure 3 is another implementation of the multiple capacitor according to the present invention. Cross section in example,
FIG. 4 is a sectional view of yet another embodiment,
FIG. 5 is a front sectional view of a conventional multiple capacitor, and FIG. 6 is a diagram showing problems in the insulating resin molding process of the conventional multiple capacitor. 1... Dielectric ceramic, 2, 3... Electrode, 4, 5...
...Terminal fitting, 8...Insulating resin, 10...Flexible conductive wire.

Claims (1)

[Scope of utility model registration request] A plurality of capacitors each having electrodes on two opposing surfaces of dielectric ceramic are arranged in series and the opposing electrodes are electrically connected to each other, and at least one set of adjacent capacitors among the plurality of capacitors. connects opposing electrodes with a flexible conductive wire,
A multiple capacitor characterized in that at least two capacitors located at both ends have terminal fittings fixed to the open side electrodes, and the whole is molded with an insulating resin, leaving a part of the terminal fittings.