JPH029534Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a flat plate type capacitor.

Like oil capacitors and electrolytic capacitors,
Capacitors that need to hold liquid such as insulating oil or electrolyte inside have a cylindrical or box-shaped storage container with a sealing plate attached to the open end of the container to prevent leakage or evaporation of the liquid. are arranged and sealed by means such as welding or caulking. However, since the sealing portion requires a considerable volume, it has been difficult to create a flat capacitor.

Conventionally, as shown in FIG. 1, as in the patent application filed by the present applicant in 1987-187458, there has been a storage chamber 2 for storing a flat capacitor element 1, and an elastic member 3 for packing around the storage chamber 2. recess 4 for
There has been a structure that consists of a storage member 5 having a housing part and a plate member 6 that covers this storage part, and these are joined by riveting or welding, but with this structure, processing of the storage member 5 is not easy, and the joining is difficult. This also takes time, and since a joining margin must be provided around the periphery of the storage member 5, the capacitor becomes larger.

Although not shown, a capacitor with a structure in which a flat capacitor element is covered with a bag-like soft sheet has also been proposed, but it has drawbacks such as being easily bent, so it cannot necessarily be used for all purposes. do not have.

The purpose of this invention is to obtain a flat plate capacitor extremely easily and at low cost. This invention will be explained in detail below based on examples.

FIG. 2 is a perspective view showing the flat capacitor of this invention, where the flat capacitor element 11 is formed into a flat shape by overlapping or winding foil electrodes and dielectric material (separator paper in the case of electrolytic capacitors). An electrode lead 12 is connected to the foil-like electrode and drawn out from the end face of the capacitor element 11. This capacitor element 11 is impregnated with insulating oil or electrolyte by a known method.

In the capacitor 11, rectangular plate-shaped exterior plates 15 and 16 made of metal, synthetic resin, etc. are arranged so as to cover the plane portion 13 and the back surface 14 of the capacitor 11, and sandwich the capacitor element 11 therebetween. The outer plates 15 and 16 are provided with grooves 22 having a substantially V-shaped cross section on their peripheral edges, and the grooves 22 protrude to opposite sides of the outer plates 15 and 16 to form protrusions 23.

Further, a ring-shaped packing member 17 made of an elastic material such as rubber or elastic synthetic resin and having a thickness equal to or slightly thicker than that of the capacitor element 11 is arranged so as to surround the entire circumference of the end face of the capacitor element 11. Together with the exterior plates 15 and 16, the capacitor element 11 is hermetically sealed over its entire surface. Note that the electrode lead 12 is drawn out to the outside through a through hole 18 provided in the packing member 17, so that an electrical connection with the outside can be obtained. And the two exterior plates 15 and 16 are
As shown in FIG. 3, the cross section is approximately U-shaped, and the peripheral edge thereof is held and fixed by an elastic holding tool 19 made of a spring material or the like, which gradually becomes narrower toward the tip.

This clamping tool 19 gradually becomes narrower as it approaches the bending tip, and further bends inward at an angle at the tip end to form the narrowest portion 20.

FIG. 4 shows the completed state of the capacitor after this fixation, and shows that each side of the exterior plates 15 and 16 is held by one or more holding tools 19.

FIG. 5 is a cross-sectional view of the sandwiched state, and the capacitor element 11 has an exterior plate 1 on its upper and lower surfaces.
5 and 16 have a packing member 17 located on the side, and the end where the packing member 17 is located is connected to the outermost plate 15, 1 by the most sandwiched part 20 at the tip of the clamping tool 19.
6 is pressed from the outside by elastic force and sealed. At this time, the clamping tool 19 is attached to the exterior plate 1 as shown in the same figure.
The narrowest part 20 fits into the groove 22 provided in the grooves 5 and 16, so that the clamping tool 19 does not fall out. Further, a protrusion 23 protruding from the opposite side of the groove 22 bites into the packing member 17 to achieve more complete contact.

The capacitor of this invention constructed in this way includes two exterior plates 15 and 16 and a packing member 17.
The capacitor can be packaged and sealed extremely easily using the simple structure of the clamping tool 19.

FIG. 6 is a sectional view showing another embodiment of this invention, in which a plurality of flat capacitor elements 30A, 3
0B and 30C are arranged adjacently on the same plane,
Both sides of these capacitor elements are plate-shaped exterior plates 3
1 and 32, and a packing member 33 is arranged to partition the periphery of the capacitor elements 30A, 30B, 30C and between each capacitor element.
The peripheral edge of No. 2 is fixed. At this time, the exterior plates 31 and 32 are provided with a groove 34 having a substantially V-shaped cross section at the peripheral edge thereof and at a position separating each capacitor element, and the tip of the clamping tool 19 is inserted into the groove 34A on the peripheral edge. It fits firmly into place and has a strong fixation. In addition, the tips of the grooves 34B provided at positions that partition the capacitor elements dig inward into the packing member to further ensure the sealing of each capacitor element.

In addition, each capacitor element 30A, 30B, 30C
Leads 35A, 35B, 35C pulled out from
The bushing 3 is inserted into the through hole provided in the exterior plate 31.
It is electrically connected to external terminals 36A, 36B, and 36C attached via terminals 7A, 37B, and 37C, respectively.

The capacitor of this invention constructed in this manner can be constructed as a flat plate capacitor in the same way as in the previous embodiment even if it includes a plurality of capacitor elements. Note that the exterior plate 3 shown in this example
The grooves 34 provided at 1 and 32 not only contribute to sealing, but also serve as ribs on the exterior plate to improve strength against pressure from a plane direction.

FIG. 7 shows a cross section of yet another embodiment, in which a flat capacitor element 11 is surrounded at its peripheral edge by a packing member 17 made of an elastic material,
Its upper surface is covered with a plate-shaped exterior plate 40, and its lower surface is covered with an exterior plate 41 made of a member having elasticity such as metal. At this time, the exterior plate 40 on the upper surface is a simple flat plate with a cross section of approximately V at its periphery, as in the previous embodiment.
A letter-shaped groove 22 is provided. However, the end of the lower exterior plate 41 is bent upward and further inward near the exterior plate 40, and its tip fits into the groove 22 of the exterior plate 40 and is clamped and fixed. There is. With this configuration, the exterior plate 41 can also serve as a clamping tool, so there is no need to use a separate clamping tool.

In addition, in such an embodiment, in order to ensure the strength of the plane part and not increase the thickness, the material of the exterior plate can be a high-strength metal thin plate such as iron, nickel, stainless steel, brass, etc. If these materials are likely to corrode the capacitor element, or conversely be attacked by the internal electrolyte, or if electrical insulation is required, make sure that at least one of these metal plates is in contact with the capacitor element. A material in which one side in contact with the other is laminated with a chemical-resistant organic insulating film may be used as the exterior plate. In addition, when it is preferable to use aluminum material for the metal exterior plate, such as in an aluminum electrolytic capacitor, if only aluminum is used, the exterior plate becomes thicker to ensure strength, and the capacitor as a whole becomes thicker. A so-called clad material may be used, in which a thin aluminum plate is bonded to at least one surface of a high-strength metal thin plate that contacts the capacitor element.

As described above, according to this invention, the exterior of an extremely thin plate-shaped capacitor can be constructed using only two plate-shaped exterior plates, a packing member that surrounds the periphery of the capacitor element, and a clamping tool that clamps and secures the periphery. The number of parts can be reduced, and the capacitor can be assembled very easily. Moreover, each of these exterior parts can be easily produced, and together with this, it is possible to extremely reduce the manufacturing cost of the capacitor.

Furthermore, compared to conventional flat plate capacitors, the device storage efficiency is better and the capacitance per volume can be increased.

In the embodiment of this invention, the case where the shape of the capacitor is rectangular has been described, but this invention is not limited to this shape in any way, and may be circular or the like. Therefore, it can also be made into an irregular shape. Further, as described in the second embodiment, since a plurality of capacitor elements can be incorporated to form a flat plate capacitor of any shape, it can be used in many applications.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional flat plate capacitor, Fig. 2 is an exploded perspective view showing an embodiment of the flat plate capacitor of this invention, and Fig. 3 is a perspective view showing a clamping tool used in this invention. Fig. 4 is a perspective view showing the completed state of the flat plate capacitor shown in Fig. 2, Fig. 5 is a partial sectional view of the flat plate capacitor shown in Fig. 4, and Figs. FIG. 2 is a sectional view showing an embodiment of the invention. 1, 11, 30... Capacitor element, 15, 1
6, 31, 32, 40, 41... Exterior plate, 17...
... Packing member, 19 ... Clamping tool, 22, 34
……groove.

Claims (1)

[Claims for Utility Model Registration] (1) A flat capacitor element, a plate-shaped exterior member that covers both sides of the capacitor element, and a peripheral edge between the plate-shaped exterior members that surrounds the capacitor element. A flat capacitor comprising: a packing member made of an arranged elastic body; and means for clamping and fixing part or all of the peripheral edge of a plate-shaped exterior member including the packing member by elastic force. (2) The flat capacitor according to claim 1, wherein the flat capacitor element is composed of two or more element groups. (3) The means for clamping and fixing by means of elastic force is one in which the peripheral edge of the plate-shaped exterior member is clamped and fixed by an elastic clamping tool having a substantially U-shaped cross section and gradually narrowing toward the tip. A flat plate capacitor according to claim 1 or 2 of the utility model registration claim. (4) The means for clamping and fixing using elastic force is formed by bending and forming one peripheral edge of the plate-shaped exterior member so that the cross section is approximately U-shaped, and using this formed part to hold the peripheral edge of the other plate-shaped exterior member. A flat plate capacitor according to claim 1 or 2 of the utility model registration claim, which is clamped and fixed. (5) Claims 3 or 4 for registration of a utility model in which a plate-shaped exterior member is provided with a groove having a substantially V-shaped cross section at its periphery or at a position where a plurality of capacitor elements are partitioned. The flat plate capacitor described. (6) Claim No. 1 for Utility Model Registration where the plate-shaped exterior member is a metal plate laminated with a chemical-resistant organic insulating film on at least one side.
A flat plate capacitor according to items 1 to 5. (7) A flat plate capacitor according to claims 1 to 5, wherein the plate-shaped exterior member is a high-strength thin metal plate having a thin aluminum plate bonded to at least one side thereof.