JP2001085267A - 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 a metal vessel and 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, a radiator plate 7 that is put between the capacitor elements 1 of the element body 6 and protrudes from a metal vessel 16, and an aggregate 15 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 16 with resin 13.

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 insulating oil.
This is to improve heat dissipation.

[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. In addition, since no heat radiating means is provided for the rise in temperature of the capacitor element, the above-mentioned problem of flammability has not been sufficiently addressed.

[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 by internal lead-out terminals to form a body, and a heat sink is inserted between the capacitor elements forming the body, A small and lightweight dry metallized film in which an assembly in which the end surface and side surfaces are covered with an insulating resin is housed in a metal container by projecting the heat sink, and the assembly is fixed to the metal container with resin. A capacitor is provided.

[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 , a heat sink 7 interposed between the capacitor elements 1 of the body and protruding from the metal container 16, and an assembly 1 in which the end face and side faces of the body are covered with an insulating resin 10.
5 is characterized by being fixed with resin in a metal container 16.

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.

Further, the outer peripheral portion of the side surface of the element body 6 is covered with a side surface protective insulator 9.

[0008] The insulating resin 10 is characterized by comprising a concave insulating case 11 and a filling resin 12.

Further, a radiating fin 18 is attached to the radiating plate 7.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of capacitor elements whose outer peripheral portions are coated with an insulator by spraying a metal on the winding end face are connected in parallel with internal lead terminals to form a body. A heat sink is interposed between the formed capacitor elements, and the end body and the side surface of the element body covered with an insulating resin are housed in a metal container, and the assembly is fixed with resin. The heat sink protrudes from the metal container. A small and lightweight dry-type metallized film capacitor that does not use an insulating oil and an insulating gas can be manufactured, and a filling and sealing step is not required, and 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, and the heat dissipation is improved.

[0011]

Embodiment 1 FIG. 1 is a drawing showing one embodiment of a dry metallized film capacitor of the present invention, wherein (a) is a longitudinal sectional view, (b) is a partial sectional view on the right side, and (c). Is the bottom view,
FIG. 3 is a drawing of the assembly constituting FIG. 1, (a) is a plan view, (b) is a longitudinal sectional view, (c) is a side view from which a filling resin and a concave insulating case are removed, and FIG. 3 is a drawing of the elementary body constituting FIG. 3, (a) is a plan view, (b) is a longitudinal sectional view, (c)
5 is a partial sectional view of the right side, FIG. 5 is a drawing of an embodiment of the concave insulating case, (a) is a plan view, and (b) is a longitudinal sectional view. FIG. 8 is a perspective view in which an insulator is coated on an outer peripheral portion of a side surface of a capacitor element having an electrode lead portion formed on a winding end surface,
FIG. 9 is an expanded view of a pair of metallized films.

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 11 shown in FIG. 5 is placed on the element 6 and the support plate 14 connected by the internal lead-out terminal 5 to form the element. A heat radiating plate 7 is inserted between the capacitor elements 1 and the supporting plate 1 is attached to the inner wall of the concave insulating case.
4 are brought into contact with each other, and an assembly 15 formed by filling and curing the filling resin 12 therebetween is stored in a metal container 16, and the radiator plate 7 extending from the lower end of the assembly is connected to the metal container. After the resin 13 is filled between the metal container 16 and the assembly 15 and cured, the internal lead-out terminal 5 pulled out from the assembly 15 is made of metal. It is connected to an external terminal 17 provided on the container 16.

The element body 6 shown in FIG. 4 is composed of a plurality of capacitor elements.
Between 1 and fixed with an epoxy-based or silicone-based putty-like adhesive 8, inserted through the heat radiating plate 7 shown in FIG. 6, copper subjected to tin plating, and the round hole 5a made of brass provided The internal lead terminals 5 are formed in parallel with the electrode lead portions 3 of the plurality of capacitor elements 1 . The capacitor element 1 is
Metallized film 2 composed of a pair of metallized polypropylene films, metallized polyester films, etc. shown in FIG.
The metallized film is scattered by metal deposition by burn-off method and rolled back, or rolled with a polypropylene film, polyester film, etc. as a back-wound film, and zinc, solder or other metal is sprayed on the rolled end surface Thus, the electrode lead portion 3 is formed.

[0014] insulator 4 as shown in FIG. 8, 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 heat radiating plate 7 shown in FIG. 6 is made of aluminum. A circuit is printed on one of the aluminum plates with an anti-compression material, the plates are superposed, rolled and pressed, and the circuit is expanded with high-pressure air. Water and a solvent having a cooling effect are injected as a coolant and sealed, and the fixing hole 7 is formed.
a is provided.

The concave insulating case 11 is large enough to cover the element 6 and the like connected to the internal lead-out terminal 5. The length of the support plate 14 made of an insulating material may be appropriately determined according to the thickness of the filling resin 12 filled between the element body 6 and the concave insulating case 11. The filling resin 12 and the resin 13 are made of an insulating thermosetting resin such as an epoxy resin or a polyurethane resin. The concave insulating case 11 shown in FIG. Alternatively, it is formed by vacuum molding of polyvinyl chloride, polycarbonate or the like.

According to the above construction, 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, a heat sink is inserted between a plurality of capacitor elements, and the heat sink is projected outside through the through hole of the metal container. Dissipation can reduce the temperature rise of the capacitor. Furthermore, 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 resin, the assembling work is simple and robust, the protection of the internal elements is ensured, and the vibration resistance is improved.

Embodiment 2 FIGS. 2A and 2B show another embodiment of the dry metallized film capacitor of the present invention, wherein FIG. 2A is a longitudinal sectional view, FIG. 2B is a partial sectional view on the right side, and FIG. Is a bottom view. In the figure, components denoted by the same reference numerals as those in FIG. 1 are the same components, and description thereof will be 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, and a heat radiating fin is attached to a heat radiating plate protruding from the metal container.

The side surface protective insulator 9 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 described above. 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 9, and the end surface is filled with the filling resin 12 and cured. Radiation fins 18
Is formed by extruding aluminum as shown in FIG. 7 and has a fixing hole 18a.
a is attached via a bolt 19 and a nut 20. FIG. 2 shows a case where two radiating fins 18 are attached, but one may be sufficient.

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. In addition, since the heat radiation area is increased by attaching the heat radiation fins, the heat generated by the capacitor can be radiated to the outside more quickly, and the temperature rise can be reduced.

[0021]

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, a heat sink is inserted between a plurality of capacitor elements, and the heat sink is projected outside through the through hole of the metal container. By dissipating the heat, the temperature rise of the capacitor can be reduced. Further, by attaching the heat radiation fins, the heat radiation area can be increased, and the heat generated by the capacitor can be dissipated to the outside more quickly, and the temperature rise can be reduced. Furthermore, 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 resin, the assembling work is simple and robust, the protection of the internal elements is ensured, and the vibration resistance is improved. In addition, since the outer periphery of the side surface of the element is covered with a heat-resistant or flame-resistant side protection insulator, even if the capacitor element is abnormal and the capacitor element is melted or eluted, this side protection insulation 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 drawing showing one embodiment of a dry metallized film capacitor of the present invention, wherein (a) is a longitudinal sectional view, (b) is a partial sectional view on the right side, and (c) is a bottom view. .

FIG. 2 is a drawing showing another embodiment of the dry metallized film capacitor of the present invention, wherein (a) is a longitudinal sectional view and (b)
Is a right side partial sectional view, and (c) is a bottom view.

FIG. 3 is a drawing of an aggregate constituting FIG. 1;
2 is a plan view, FIG. 2B is a longitudinal sectional view, and FIG. 2C is a side view with the filling 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 longitudinal sectional view, and FIG.

FIG. 5 is a drawing of one embodiment of the concave insulating case of the present invention, wherein (a) is a plan view and (b) is a longitudinal sectional view.

FIG. 6 is a drawing of one embodiment of a heat sink of the present invention.
(A) is a plan view and (b) is a front view.

FIGS. 7A and 7B are drawings of one embodiment of the radiation fin of the present invention, wherein FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a perspective view.

FIG. 8 is a perspective view of one embodiment of the capacitor element of the present invention in which an outer peripheral portion is covered with an insulator.

FIG. 9 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 Heat radiating plate 7a Fixing hole 8 Adhesive 9 Side-surface protective insulator 10 Insulating resin 11 Concave insulating case 12 Filling resin 13 Resin 14 Support plate 15 Assembly 16 Metal container 16a Through hole 17 External terminal 18 Heat radiating fin 18a Fixing hole 19 Bolt 20 Nut

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Atsushi Suezaki, Nichicon Co., Ltd. (72) Inventor Toru Nakaji Kyoto avenue F-term in Nichicon Co., Ltd. F-term (reference) 5E082 AA11 AB04 BC25 BC36 BC39 CC06 CC13 EE07 EE37 FG06 FG35 FG36 HH07 HH28 JJ04 JJ22

Claims (5)

[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 heat sink interposed between the capacitor elements of the element body and protruding from the metal container, and an assembly in which the end surface and side surfaces of the element body are covered with an insulating resin are resin-fixed in the metal container. A dry metallized film capacitor characterized by the following: 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. 5. The dry metallized film capacitor according to claim 1, wherein heat radiating fins are attached to said heat radiating plate.