JP5672626B2 - Capacitor device - Google Patents

Description

  The present invention relates to a capacitor device used for electric power or the like in which a plurality of capacitor elements each made of a film-like dielectric and electrode foil are arranged in parallel and enclosed with an insulating medium in a container.

  A conventional example will be described with reference to FIGS. Capacitor element 1 of a capacitor device used for electric power or the like includes a dielectric film such as polypropylene or a film-like dielectric such as paper and a pair of electrode foils such as aluminum, and the side edges of the electrode foils are mutually dielectric. After being alternately overlapped so as to protrude from the side edge of the body and wound into a cylindrical shape, it is formed into a flat shape. The electrode foil is exposed at the side edge portion of the capacitor element 1, and the exposed portion is folded to form the protruding electrode 1a.

  As shown in FIGS. 2 and 3, a plurality of capacitor elements 1 are arranged in parallel (eight in the figure), and the collective plate 2 sandwiches the capacitor elements 1 on both surfaces on both sides of the two sides of the arranged capacitor elements 1. Are arranged as follows. The assembly plate 2 is provided with a fixing portion 2a for attaching an assembly member 3 described later. By manufacturing the collective plate 2 with a plate material, the fixed portion 2a can be manufactured simply by bending the end portion.

  In the conventional example, flat steel is used for the assembly member 3. When flat steel is used for the collective member 3, the reinforcing paper 4 is wound around the collective member 3 a plurality of times. The reinforcing paper 4 is provided so as not to cause dielectric breakdown between the assembly member 3 and the capacitor element 1. The assembly member 3 is fixed to the fixing portion 2a with a bolt or the like (not shown) to complete the assembly of the capacitor elements 1. An assembly member 3 is attached to a fixing portion 2a provided on the assembly plate 2 by bolts (not shown), and the plurality of capacitor elements 1 and the assembly plate 2 are fixed.

  The capacitor element 1 integrated with the collecting plate 2 by the collecting member 3 is housed in a container (not shown) such as a tank or can, filled with an insulating medium such as insulating oil or insulating gas, and then sealed to form a capacitor. The device is completed.

JP 2000-306768 A

  Although the protruding electrode 1a of the conventional capacitor element 1 is folded, there is a problem that the electrode foil of the protruding electrode 1a gradually rises and is broken due to the influence of an electric field or the like. In order to prevent the electrode foil of the protruding electrode 1a from being damaged, a space 7 must be provided between the protruding electrode 1a and the insulating member 5.

  However, if the space 7 is provided between the protruding electrode 1a and the insulating member 5 as described above, there is a problem that the entire capacitor device becomes large. In addition, since the capacitor device as a whole becomes large, a large amount of insulating medium such as insulating oil sealed in the container is required, and more material is used for the components of the device, which increases costs. It was.

In the present invention, a dielectric and a pair of electrode foils are alternately overlapped so that the side edges of each electrode foil protrude from the side edges of the dielectric, and are wound into a cylindrical shape, and then flattened. Capacitors in which a plurality of formed capacitor elements each having a protruding electrode formed by folding the protruding electrode foil are juxtaposed, sandwiched by an assembly plate, fixed by an assembly member, and then stored in a container and filled with an insulating medium and sealed In the apparatus, a buffer member is disposed between the assembly member and the capacitor element so as to be in contact with the protruding electrode.

  By arranging the buffer member so as to be in contact with the protruding electrode, it is possible to prevent the electrode foil from being raised or damaged, and to make the entire capacitor device compact. In addition, by reducing the size of the entire capacitor device, the amount of insulating medium such as insulating oil sealed in the container can be reduced, and the material of the constituent members can be reduced, so the cost of the capacitor device can be reduced. Can do.

FIG. 1 is a plan view of a capacitor device according to an embodiment of the present invention. FIG. 2 is a plan view of a conventional capacitor device. FIG. 3 is a perspective view of a conventional capacitor device.

  An embodiment of the present invention will be described below with reference to FIG. Capacitor element 1 includes a dielectric film such as polypropylene or a film-like dielectric such as paper and a pair of electrode foils such as aluminum such that the side edges of each electrode foil protrude from the side edges of the dielectric. After being alternately stacked and wound into a cylindrical shape, it is formed into a flat shape. The protruding electrode foil is folded to form the protruding electrode 1a.

  A plurality of capacitor elements 1 are juxtaposed (eight in the figure), and a collective plate 2 is arranged so as to sandwich the capacitor element 1 between the planar sides of both ends of the capacitor element 1. The assembly plate 2 is provided with a fixing portion 2a for attaching an assembly member 3 described later.

  The buffer member 6 is applied so as to be in contact with the protruding electrode 1 a, and the insulating member 5 is in contact with the buffer member 6. The insulating member 5 is made of a material such as paper, a press board, a plastic plate, a reinforced plastic plate, or a bakelite plate. Further, the cushioning member 6 is a member having a cushion effect. Damage to the protruding electrode 1a can be prevented by this cushion effect.

  In this embodiment, flat steel is used for the assembly member 3. When flat steel is used for the collective member 3, the reinforcing paper 4 is wound around the collective member 3 a plurality of times. By applying the reinforcing paper 4 to the insulating member 5, the buffer member 6 protrudes and presses the electrode 1a with the insulating member 5 interposed therebetween. Then, the end portion of the assembly member 3 is fixed to a fixing portion 2a provided on the assembly plate 2 with a bolt or the like (not shown), and the assembly of the capacitor element 1 is completed.

  The assembly of the capacitor elements 1 is stored in a container (not shown) such as a tank or a can, filled with an insulating medium such as insulating oil, and then sealed to complete the capacitor device.

1 Capacitor element 1a Extruding electrode
2 Assembly plate 2a Fixing part 3 Assembly member 4 Reinforcement paper 5 Insulation member 6 Buffer member 7 Space

Claims (1)

The dielectric and the pair of electrode foils are alternately stacked so that the side edges of the electrode foils protrude from the side edges of the dielectric, wound into a cylindrical shape, and then formed into a flat shape and protruded In a capacitor device in which a plurality of capacitor elements each having a protruding electrode formed by folding the electrode foil are arranged in parallel, sandwiched by a collective plate, fixed by a collective member, and then stored in a container and filled with an insulating medium, the collective member And a capacitor element, a buffer member is disposed so as to be in contact with the protruding electrode.

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