JP2001085268A - Dry metallized film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a safe, small and light dry metallized film capacitor using a metallized film and not using insulating oil. SOLUTION: An element body 6 wherein winding end surfaces of a plurality of capacitor elements 1, formed by winding a pair of metallized films 2 in piles and thermal-spraying metal on a winding end surface, are connected in parallel using an internal leading-out terminal 5, and an aggregate 12 wherein an end surface and a side surface of the element body 6 are coated with insulating resin 10 are fixed in the metal vessel 13 with resin 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry metallized film capacitor which uses a metallized film and does not use an insulating oil.

[0002]

2. Description of the Related Art Conventionally, metallized film capacitors used for industrial equipment such as vehicles, rolling mills, direct current power transmission, and power factor correction use a metallized film obtained by evaporating aluminum or the like on a polypropylene film. Oil-impregnated metallized film capacitors were used.

[0003]

In the above-mentioned metallized film capacitor, a capacitor element provided with an electrode lead-out portion is assembled, surrounded by a surrounding insulating material to form an elementary body, and placed in a metal container via an insulating material. As it is stored and impregnated with flammable insulating oil, it is large, heavy and easily burnable. Therefore, recently, for the purpose of disaster prevention and the like, a small and lightweight dry-type capacitor that does not use flammable insulating oil has been increasingly required.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem of being large, heavy, and flammable by using insulating oil,
Without using an insulating gas, a plurality of capacitor elements are connected in parallel with internal lead-out terminals to form a body, and an end body and side faces of the body covered with an insulating resin are made of metal. An object of the present invention is to provide a small, lightweight, dry-type metallized film capacitor that is housed in a container and fixed with a resin.

[0005] That is, a body in which a pair of metallized films 2 are stacked and wound, and the wound end faces of a plurality of capacitor elements 1 formed by spraying metal on the wound end faces are connected in parallel by internal lead-out terminals 5. 6, and an assembly 12 in which an end face and side faces of the element body are covered with an insulating resin 10 is fixed to a metal container 13 with a resin.

The outer peripheral portion of the side surface of the element 1 is made of an insulator 4
It is characterized by being coated with.

Furthermore, the outer peripheral portion of the side surface of the element body 6 is covered with a side surface protective insulator 7.

The insulating resin 10 is characterized by comprising a concave insulating case 9 and a filling resin 8.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of capacitor elements whose outer peripheral portions are coated with an insulator by spraying metal on the winding end surface are connected in parallel with internal lead terminals to form a body. An assembly in which an end surface and a side surface are covered with an insulating resin is housed in a metal container provided with external terminals, and the assembly is fixed with resin. Small size that does not use insulating oil and insulating gas,
A lightweight dry-type metallized film capacitor can be manufactured, and a step of filling and sealing is not required, so that the number of steps can be reduced. Further, by storing the above-mentioned assembly in a metal container, the protection of the internal elements is ensured.

[0010]

[Embodiment 1] FIG. 1 is a longitudinal sectional view showing an embodiment of a dry metallized film capacitor according to the present invention. FIG. 3 is a drawing of an assembly constituting FIG. 1, and FIG. , (B)
4 is a longitudinal sectional view, FIG. 4C is a side view of the resin body on one side, and a concave insulating case is removed, FIG. 4 is a drawing of a body constituting FIG. 3, FIG. 4A is a plan view, and FIG. Is a front view, (c) is a side view, and FIG. 6 is a drawing of one embodiment of a concave insulating case.
(A) is a plan view and (b) is a cross-sectional view. FIG. 7 is a perspective view of a capacitor element in which an electrode lead-out portion is formed on a winding end face, and an outer peripheral portion of the capacitor element is coated with an insulator. FIG. 8 is a drawing in which a pair of metallized films is developed.

An embodiment of the present invention will be described below with reference to the drawings. In the dry metallized film capacitor shown in FIG. 1, the concave insulating case 9 shown in FIG. 6 is put on the support body 11 and the element body 6 connected by the internal lead-out terminal 5, and the inner wall of the concave insulating case is An assembly 12 formed by filling and curing the filling resin 8 during the contact with the support plate 11 is stored in a metal container 13, and the resin 15 is
Is filled and cured, and the internal lead-out terminal 5 pulled out from the assembly 12 is connected to the external terminal 14 provided in the metal container 13.

The body 6 shown in FIG. 4 is made of copper plated with tin or the like.
An internal lead terminal 5 having a round hole 5 a made of brass or the like is formed in parallel with the electrode lead portions 3 of the plurality of capacitor elements 1 . Capacitor element 1 is formed by winding a pair of metallized films 2 such as a metallized polypropylene film and a metallized polyester film shown in FIG. 8 and scattering the metallized film by a burn-off method. Alternatively, it is wound with a polypropylene film, polyester film, or the like as a later-wound film, and a metal such as zinc or solder is sprayed on the wound end surface to form the electrode lead portion 3.

[0013] insulator 4 as shown in FIG. 7, a polyester side outer peripheral portion of the capacitor element 1, polypropylene,
Wrap or roll a thermoplastic adhesive tape such as polyimide, a thermosetting adhesive tape or a flame-retardant adhesive tape impregnated with a resin such as unsaturated polyester or epoxy, or vinyl chloride, polyester, cross-linked polyethylene, or silicon. It is made by heat shrinking by putting a heat shrink tube such as rubber.

The concave insulating case 9 is large enough to cover the element body 6 connected to the internal lead-out terminal 5 and the like. The length of the support plate 11 made of an insulating material may be appropriately determined according to the thickness of the filling resin 8 to be filled between the element body 6 and the concave insulating case 9. The filling resin 8 and the resin 15 are made of an insulating thermosetting resin such as an epoxy resin or a polyurethane resin, and the concave insulating case 9 shown in FIG. 6 is formed of a resin such as polybutylene terephthalate, polycarbonate, polyethylene terephthalate, or the like. Alternatively, it is formed by vacuum molding of polyvinyl chloride, polycarbonate or the like.

According to the above configuration, since no insulating oil or insulating gas is used, vacuum drying, impregnation and washing steps are not required, so that the construction period can be greatly shortened. It is possible to stabilize the quality without characteristic deterioration due to leakage of water. In addition, since the outer periphery of the side surface of each capacitor element is covered with an insulating insulator, and the end surface and the side surface of the element body are covered with an insulating resin composed of a concave insulating case and a filling resin, metal The container and the assembly can be reliably insulated from each other, and the dielectric strength does not decrease. further,
Since the assembly is fixed to the metal container with the resin, the assembling work is simple and robust, the protection of the internal elements is ensured, and the vibration resistance is improved.

Embodiment 2 FIG. 2 is a longitudinal sectional view showing another embodiment of the dry metallized film capacitor of the present invention.
2 is a drawing of the assembly constituting FIG. 2, (a) is a plan view,
(B) is a longitudinal sectional view, (c) is a side view from which the filling resin on one side and a concave insulating case are removed, and in the figure, the same reference numerals as those in FIG. Is omitted. The difference from the above-described embodiment is that the outer peripheral portion of the side surface of the element body is covered with a side surface protective insulator.

The side protection insulator 7 is made of at least a heat-resistant film such as polyimide or Nomex, or a flame-retardant sheet, and is connected to the internal lead-out terminal 5 forming the element body 6 . One or more layers of the outer peripheral portion of the side surface excluding the surface of the lead portion 3 are wound with the side surface protective insulator 7, and the end surface thereof is filled with the filling resin 8 and cured.

According to the above configuration, the same effect as in the first embodiment is obtained, and the outer peripheral portion of the side surface of the element is covered with the heat-resistant or flame-retardant side-surface protective insulator. Even if the capacitor element becomes abnormal or the capacitor element is melted or eluted, the capacitor element can be protected by the side surface protective insulator and a short circuit with the metal container can be prevented.

[0019]

As is clear from the above embodiment, since the dry metallized film capacitor of the present invention does not use insulating oil or insulating gas, vacuum drying, impregnation and washing steps are not required, and the construction period is large. In addition, the quality can be stabilized without deterioration of characteristics due to leakage of insulating oil or leakage of insulating gas. In addition, since the outer periphery of the side surface of each capacitor element is covered with an insulating insulator, and the end surface and the side surface of the element body are covered with an insulating resin composed of a concave insulating case and a filling resin, metal The container and the assembly can be reliably insulated from each other, and the dielectric strength does not decrease. Further, since the assembly is fixed to the metal container with a resin, the assembling work is simple and robust, the protection of the internal elements is ensured, and the vibration resistance is improved. And since the outer peripheral part of the side of the element is covered with a heat-resistant or flame-retardant side-surface protective insulator, even if the capacitor element is damaged and the capacitor element is melted or eluted, There is an advantage that it can be protected by a material and a short circuit with a metal container can be prevented, and its value is extremely large industrially and practically.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a dry metallized film capacitor of the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment of the dry metallized film capacitor of the present invention.

FIG. 3 is a drawing of an aggregate constituting FIG. 1;
Is a plan view, (b) is a longitudinal sectional view, and (c) is a side view with one side of the resin and the concave insulating case removed.

FIGS. 4A and 4B are drawings of a body constituting FIG. 3, wherein FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a side view.

FIG. 5 is a drawing of an aggregate constituting FIG. 2;
Is a plan view, (b) is a longitudinal sectional view, and (c) is a side view with one side of the resin and the concave insulating case removed.

FIG. 6 is a drawing of an embodiment of the concave insulating case of the present invention, wherein (a) is a plan view and (b) is a sectional view.

FIG. 7 is a perspective view showing a capacitor element according to one embodiment of the present invention.

FIG. 8 is a drawing of an embodiment in which a pair of metallized films of the present invention are developed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Metallized film 3 Electrode lead-out part 4 Insulator 5 Internal lead-out terminal 5a Round hole 6 Element 7 Side protection insulator 8 Filling resin 9 Concave insulating case 10 Insulating resin 11 Support plate 12 Assembly 13 Metal Container 14 External terminal 15 Resin

Continuing on the front page (72) Inventor Atsushi Atsushi, Nichicon Co., Ltd., 3rd floor, Uehara Building, 3rd floor, 191 Nakaboricho, Ichidori Karasuma Higashi-iri, Nakagyo-ku, Kyoto-shi, Kyoto (72) Inventor Toru Nakaji Chukyo, Kyoto-shi, Kyoto F-term (reference) 5E082 AA11 AB04 BC21 BC36 BC39 CC06 CC13 EE07 EE37 FG06 FG35 FG36 HH07 HH28 HH47 JJ04 JJ22

Claims (4)

[Claims] 1. A pair of metallized films are stacked and wound,
A body in which the winding end faces of a plurality of capacitor elements formed by spraying a metal on the winding end face are connected in parallel by internal lead-out terminals,
A dry metallized film capacitor, characterized in that an assembly in which an end face and side faces of the element body are covered with an insulating resin is fixed in a metal container with a resin. 2. The dry metallized film capacitor according to claim 1, wherein an outer peripheral portion of the side surface of the element is covered with an insulator. 3. The dry metallized film capacitor according to claim 1, wherein an outer peripheral portion of the side surface of the element body is covered with a side surface protective insulator. 4. The dry metallized film capacitor according to claim 1, wherein said insulating resin comprises a concave insulating case and a filling resin.