JP2000353638A - Dry metallized film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry metallized film capacitor which can be made safe, small in size and light in weight by using a metallized film and using no metallic container and insulating oil. SOLUTION: This film capacitor is formed by overlapping and winding a pair of metallized films, thermally spraying metal onto end faces of the wound film to form capacitor elements 1, connecting the elements 1 in series, coating the outer side peripheries of the elements 1 with an insulator material 4 to form capacitor element bodies 6, connecting the wound end faces of the element bodies 6 in parallel by means of an external lead terminal 5 to form an assembly 7, and forming an insulating coating on wound end faces of the assembly 7 and on side faces of the element bodies in a recessed manner.

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 or a metal container.

[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,
Insulating gas, without using a metal container at all, a plurality of capacitor elements connected in series, a plurality of capacitor element bodies that cover the outer periphery of the side surface of the capacitor element that is connected in series with an insulator, A compact and lightweight dry-type metallized film capacitor in which an assembly is formed by connecting in parallel with an external lead-out terminal, and a winding end face portion of the assembly and a side surface of the element are concavely covered with an insulating resin. It is.

That is, a pair of metallized films 2 are stacked and wound, and a capacitor element 1 formed by spraying a metal on the winding end face is connected in series with the element 1. 4, a capacitor element body 6 covered with
Becomes six winding end surface from the parallel connected comprising aggregates 7 for the external lead terminals 5, characterized in that the insulating coating of the winding end face and the side face of the element body 6 of the aggregate 7 concavely And

[0006] A resin 13 is filled between the capacitor element 1 and the insulator 4.

Further, the material for insulatingly covering the side surface of the capacitor element body in a concave shape comprises a concave insulating case and a filling resin.

[0008] The present invention is characterized in that an insulating plate 9 is arranged on the external lead-out terminal portion 5c and fixed with a resin 13.

Further, an insulating sheet 16 is interposed between the two external lead-out terminals 5 so as to be opposed to each other.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of capacitor elements formed by spraying a metal on a winding end face are connected in series, and a capacitor element body in which an outer peripheral portion of a side surface of the element is covered with an insulator is connected to an external lead-out terminal. To form an assembly, and the winding end face of the assembly and the side surface of the element are insulated in a concave shape with a concave insulating case and a filling resin. Compared with the conventional method of filling and sealing a metal container with 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.

[0011]

[Embodiment 1] FIGS. 1A and 1B are drawings showing an embodiment of a dry metallized film capacitor according to the present invention, wherein FIG. 1A is a partial sectional view on the right plane, FIG. ) Is a partial cross-sectional view of the right side, and FIG. 3 is a drawing of an assembly forming FIG.
(A) is a plan view, (b) is a longitudinal sectional view, (c) is a side view, and FIG. 4 is a drawing of a capacitor body constituting FIG.
(A) is a longitudinal sectional view, (b) is a side view. FIG.
8A is a plan view, FIG. 8B is a longitudinal sectional view, and FIG. 8 is a perspective view of a capacitor element having an electrode lead portion formed on a winding end face. 9 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. Dry metallized film capacitor shown in FIG. 1, insert the epoxy-made insulating plate 9 molded in a concave shape shown in Figure 7 between the upper end portion and the external lead terminals 5 of the assembly 7 shown in FIG. 3, the external terminal 5b is inserted through the terminal through hole 10a of the positioning insulating plate 10 made of epoxy resin shown in FIG. 6 and pulled out (FIG. 1 (b)). Then the concave insulative case 14 shown in FIG. 5, an assembly 7 and the concave of the insulating plate 9 and the positioning insulating plate 10 formed by connecting the external lead terminals 5 aggregates
7 , the positioning insulating plate 10 and the supporting plate 15 are respectively brought into contact with the inner wall of the concave insulating case, and the filling resin 12 is filled and cured therebetween. Further, the resin 13 is injected from the resin inlet 10b, and the external lead-out terminal portion 5c, which is a connection portion between the connection portion 5a of the external lead-out terminal 5 and the external terminal 5b, and the concave insulating plate 9 are formed.
Are fixed with resin 13.

The assembly 7 shown in FIG. 3 has a connection portion 5a provided with a round hole 5d made of copper, brass or the like plated with tin or the like, and a connection portion 5a of an external lead-out terminal 5 composed of an external terminal 5b. A plurality of capacitor elements 6 connected in series
Are formed in parallel with each other. The capacitor element 6 shown in FIG. 4 includes a plurality of capacitor elements 1 connected in series at an internal lead-out terminal 8, and the capacitor elements 1 connected in series.
Is formed by covering the outer peripheral portion of the side surface with an insulator 4. The insulator 4 is made of an insulating sheet made of polyethylene terephthalate, polypropylene, polyimide or the like.
Is formed by winding a plurality of times into a shape having a size that can be inserted, or is made of an insulating pipe of polybutylene terephthalate, polycarbonate, polyvinyl chloride, or the like, and has a plurality of through holes 4a. The position of the through hole 4a is where the capacitor element 1 is connected in series, and the through hole 4a is provided one less than the number of the capacitor element 1. The resin 13 is filled and cured between the capacitor element 1 and the insulator 4 through the through hole 4a.

The 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. 9 and scattering the metallized film by a burn-off method. The electrode lead portion 3 is formed by winding or winding a polypropylene film, a polyethylene terephthalate film or the like as a later-wound film, and spraying a metal such as zinc or solder on the wound end surface.

The concave insulating case 14 is large enough to cover the assembly 7 connected to the connection portion 5a of the external lead-out terminal 5 . Since the thickness of the filling resin 12 covering the side surface of the assembly 7 is determined by the size of the positioning insulating plate 10, the dimensions of the positioning insulating plate 10 are set so that the electrode lead portions 3 at both ends of the capacitor body 6 are not exposed. It is necessary to decide appropriately. Further, in order to finish with high precision, the supporting resin 15 having the same length and the same width as the insulating plate is brought into contact with the inner wall of the concave insulating case 14 to fill the filling resin 12. The filling resin 12 and the resin 13 are made of an insulating thermosetting resin such as an epoxy resin or a polyurethane resin, and the concave insulating case 14 shown in FIG. 5 is formed of resin such as polybutylene terephthalate, polycarbonate, polyethylene terephthalate, or resin. It is formed by vacuum molding of vinyl 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, and the construction period can be greatly reduced. It is possible to stabilize the quality without characteristic deterioration due to leakage of water. In addition, the outer periphery of the side surface of each capacitor element is covered with an insulating insulator, and the connection points where the capacitor elements are connected in series are filled with resin, and the winding end surface of the assembly and the side surface of the capacitor element body are covered. It is covered in a concave shape with an insulating resin consisting of a concave insulating case and a filling resin, and a concave insulating plate is inserted between the upper end of the assembly and an external lead-out terminal. And inject
Since the external lead-out terminal and the concave insulating plate are fixed with resin, there is no decrease in the dielectric strength, no metal container is required, and the size and weight can be reduced. In addition, it has sufficient strength to withstand the external force applied to the external lead-out terminal. The positioning insulating plate and the supporting plate of the same size are respectively brought into contact with the inner wall of the concave insulating case, and the external lead-out terminal is drawn out from the terminal through hole of the positioning insulating plate. Accuracy of dimensions and external dimensions can be 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 partial sectional view on the right plane, FIG. ) Is a partial cross-sectional view on the right side. In the figure, components denoted by the same reference numerals as those in FIG. The difference from the above-described embodiment is the configuration of the external lead-out terminal.

An insulating sheet 16 made of an adhesive or non-adhesive sheet or film of polyethylene terephthalate, polypropylene, or polyimide is inserted between the external terminals 5b forming the external lead-out terminals 5 ;
The terminal through hole 10a of the positioning insulating plate 10
And pull it out.

According to the above configuration, the same effect as that of the first embodiment can be obtained. Further, since an insulating sheet is interposed between the external lead terminals, and the terminal is arranged to be opposed to and pulled out to the outside, low inductance can be achieved. Can be achieved.

In the above embodiment, a concave insulating plate is inserted into the upper end of the assembly via an external lead-out terminal. However, the shape of the insulating plate may be a flat plate, and the upper end of the assembly and the external lead-out terminal may be inserted. Any shape may be used as long as it can be inserted between the terminals and the external lead-out terminal portion and the insulating plate can be fixed with resin.

[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 in characteristics due to leakage of insulating oil or leakage of insulating gas. In addition, the outer periphery of the side surface of each capacitor element is covered with an insulating insulator, and the connection points where the capacitor elements are connected in series are filled with resin, and the winding end surface of the assembly and the side surfaces of the capacitor element are concave. Insulating concavely with a material consisting of an insulating case and a filling resin, insert the insulating plate between the upper end of the assembly and the terminal for external drawing out,
Since the resin is injected from the resin inlet of the positioning insulating plate and the external lead-out terminal and the insulating plate are fixed with the resin, there is no reduction in the dielectric strength, and a metal container is unnecessary, and the size and weight can be reduced. Furthermore, since the external lead-out terminal and the insulating plate are fixed with resin, deterioration of the characteristics of the external lead-out terminal during long-term use can be prevented, and sufficient strength to withstand the external force applied to the external lead-out terminal have. The positioning insulating plate and support plate of the same size abut against the inner wall of the concave insulating case, respectively, and the external lead-out terminal is drawn out from the terminal through hole of the positioning insulating plate, so that the assembly work is easy. Thus, the accuracy of the pitch dimension and the external dimension can be improved.
In addition, if an insulating sheet is interposed between the external lead terminals, and it is arranged to be opposed to and pulled out outward, there is an advantage that the inductance can be reduced, and the value thereof is industrially and practically valuable. There is something very large.

[Brief description of the drawings]

FIG. 1 is a drawing showing one embodiment of a dry metallized film capacitor according to the present invention, wherein FIG.
(B) is a longitudinal sectional view, and (c) is a partial sectional view on the right side.

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

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.

4 is a drawing of a capacitor body constituting FIG. 3, wherein FIG. 4 (a) is a longitudinal sectional view and FIG. 4 (b) is a side view.

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 plan view of one embodiment of a positioning insulating plate of the present invention.

FIG. 7 is a drawing of an embodiment of the insulating plate of the present invention,
(A) is a plan view and (b) is a front view.

FIG. 8 is a perspective view of one embodiment of the capacitor element of the present invention.

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 4a Through-hole 5 External lead-out terminal 5a Connection part 5b External terminal 5c External lead-out terminal part 5d Round hole 6 Capacitor body 7 Assembly 8 Internal lead-out terminal 9 Insulating plate 10 Positioning insulating plate 10a Terminal through hole 10b Resin injection port 11 Insulating material 12 Filled resin 13 Resin 14 Concave insulating case 15 Support plate 16 Insulating sheet

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsuya Kawanabe 4th floor of Uehara Bldg., 3rd floor, 191 Nakaboricho, Ichimichi, Nakagyo-ku, Kyoto-shi, Kyoto Nichicon Corporation (72) Inventor Toru Nakaji Kyoto F-term (reference) 5E082 AA11 AB04 BB03 BC39 CC06 CC12 CC13 EE07 FG06 FG35 FG36 GG08 GG10 GG11 GG27 HH22 HH06H HH25 HH28 HH48 HH50 JJ06 JJ07 JJ08 JJ22 LL13

Claims (5)

[Claims] 1. A pair of metallized films are stacked and wound,
A capacitor element formed by spraying a metal on a wound end face, a capacitor element body in which the element is connected in series, and an outer peripheral portion of a side surface of the element is covered with an insulator; A dry metallized film capacitor comprising: an assembly connected in parallel with a lead-out terminal, wherein a winding end face of the assembly and a side surface of the element body are insulated in a concave shape. 2. The dry metallized film capacitor according to claim 1, wherein a resin is filled between the capacitor element and the insulator. 3. The dry metallized film capacitor according to claim 1, wherein the material for insulatingly covering the side surface of the capacitor body comprises a concave insulating case and a filling resin. 4. The dry-type metallized film capacitor according to claim 1, wherein an insulating plate is arranged on the external lead-out terminal portion and is fixed with a resin. 5. The dry-type metallized film capacitor according to claim 1, wherein an insulating sheet is interposed between the two external lead-out terminals so as to face each other.