JP2001006972A - Dry metallized film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe, small-sized, and light-weight dry metallized film capacitor which uses metallized films and does not use any metallic container nor insulating oil. SOLUTION: A dry metallized film capacitor is composed of capacitor elements 1 each of which is formed by winding a pair of metallized films 2 in a state where one film 2 is laid on the other film 2 and melt-spraying a metal upon the end faces of the wound body, a blank capacitor body 9 which is constituted by connecting the elements 1 in series with each other and passing insulating bars 8 through the through holes 1a of the elements 1, and then, coating the outer peripheral side faces of the elements 1 with an insulator 4, and lead-out terminals 5 and 5 connected to the end faces of the wound blank capacitor body 9. At least, one of the end faces of the wound blank capacitor body 9 is coated for insulation in a recessed state and at least one of the insulating bars 8 above the recessed and coated for insulation sections is protruded.

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, a metallized film capacitor used for industrial equipment and power factor correction uses a metallized film obtained by evaporating aluminum or the like on a polypropylene film and impregnated with an insulating oil. Capacitors were employed.

[0003]

In the above-mentioned metallized film capacitor, a capacitor element provided with an electrode lead-out portion is assembled, surrounded by an insulating material to form a capacitor element body, and placed in a metal container via an insulating material. Since the capacitor element is housed and impregnated with flammable insulating oil, it is heavy and easy to burn. 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 provides the above-mentioned heavy,
In order to solve the problem of flammability, insert insulating rods into the through holes of multiple capacitor elements connected in series without using insulating oil and metal containers, and cover the outer peripheral part of the side surface of the element with an insulator. Then, an external lead-out terminal was connected to the wound end face of the element body, and at least one of the wound end face of the element body and the side surface of the element was concavely covered with an insulating resin. An object of the present invention is to provide a small and lightweight dry metallized film capacitor. Then, by inserting an insulating rod into the through hole of the capacitor element and projecting at least one of the insulating rods from the concave insulating coating portion,
An object of the present invention is to keep the mounting position of the capacitor element constant and to facilitate external mounting of the capacitor body.

That is, a pair of metallized films 2 are stacked and wound, a capacitor element 1 formed by spraying a metal on the wound end face is connected in series, and an insulating rod 8 is inserted into a through hole 1 a of the element 1. A capacitor element body 9 having an outer peripheral portion covered with an insulator 4 on the side surface of the element, and external lead terminals 5 and 5 connected to the winding end face of the element body. At least one of the portions is insulated in a concave shape, and at least one of the insulating rods 8 is protruded from the insulated insulating portion.

[0006] A resin 12 is filled between the capacitor element 1 and the insulator 4.

Further, the material of the concave insulating cover portion is characterized by comprising concave insulating cases 13, 14, and 15 and a filling resin 12.

The concave insulating cases 13, 14,
It is characterized in that at least one of the insulating rods 8 protruding from 15 is provided with a screw portion 8a.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A capacitor element formed by spraying metal on a winding end face is connected in series, an insulating rod is inserted into a through hole of the element, and an outer peripheral portion of the side face of the element is covered with an insulating material. A body is formed, an external lead-out terminal is connected to a wound end face of the body, and at least one of the wound end faces of the body is insulated and covered with a concave insulating case and a filling resin. . Compared to the conventional method of filling and sealing insulating oil in a metal container, a small and lightweight dry metallized film capacitor can be manufactured, and the process of filling and sealing is not required, reducing man-hours. be able to. Further, since the insulating rod is inserted into the through hole at the center of the plurality of capacitor elements connected in series, the capacitor elements are aligned in a straight line without meandering, and can be manufactured with high dimensional accuracy. . Furthermore, the thickness of the filling resin between the outer peripheral portion of the side surface of the capacitor element and the insulator becomes uniform, so that a decrease in withstand voltage can be prevented, and the quality can be stabilized. And
Since the threaded portion is formed on the insulating rod protruding from the concave insulating case, it can be externally mounted by the threaded portion.

[0010]

Embodiment 1 FIG. 1 is a drawing showing one embodiment of a dry metallized film capacitor of the present invention, wherein (a) is a plan view, (b) is a longitudinal sectional view, and (c) is a bottom view. And FIG. 3 is FIG.
(A) is a longitudinal sectional view, and (b) is a side view. 4 and 5 are drawings of an embodiment of the concave insulating case, (a) is a plan view,
(B) is a longitudinal sectional view, FIG. 7 is a perspective view of a capacitor element having an electrode lead-out portion formed on a winding end face, and FIG. 8 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. The dry metallized film capacitor shown in FIG. 1 has external lead terminals 5 and 5 made of copper, brass or the like on which both ends of the capacitor body 9 shown in FIG. Then, the external lead terminals 5, 5 and the insulating rod 8 of the capacitor body 9 are connected to the terminal through holes 13b of the concave insulating cases 13, 14 shown in FIGS.
14b and the insulating rod through holes 13a and 14a, respectively, are drawn out, and the capacitor body 9 is covered with the concave insulating cases 13 and 14. The concave insulating case 14
Is a shape having no resin injection port 13 c of the concave insulating case 13. Next, the filling resin 12 is filled from the resin inlet 13c of the concave insulating case 13 and hardened, and the lower concave insulating case 14 and the capacitor body 9 shown in FIG. 1 are fixed. Filled with the filling resin 12, the upper concave insulating case 13 and the capacitor body 9
Are fixed with the filling resin 12.

The capacitor body 9 shown in FIG. 3 is made of a copper in which the electrode lead-out portions 3 of the plurality of capacitor elements 1 are plated with tin or the like.
Polyacetal or polyamide connected in series with an internal lead-out terminal 10 made of brass or the like and longer than the capacitor element 1 connected in series to a through hole 1a provided in the center of the capacitor element 1 and having threaded portions 8a at both ends. A shape sized to insert an insulating insulating rod 8 made of glass-containing epoxy resin or the like, and to insert an insulating sheet made of polyethylene terephthalate, polypropylene, polyimide or the like into the outer peripheral surface of the capacitor element 1 connected in series. Or a plurality of times, or covered with an insulator 4 made of an insulating pipe such as polybutylene terephthalate, polycarbonate, or polyvinyl chloride.

In the capacitor element 1 shown in FIG. 7, a metallized film 2 composed of a pair of metallized polypropylene films and metallized polyester films shown in FIG. 8 is wound around a core as a central axis, and the metallized film is burned off. The metal vapor deposition film is scattered by the method and wound later, or as a later wound film, a polypropylene film, a polyethylene terephthalate film or the like is wound and formed,
The center hole formed after the core, which is the central axis at the time of winding, is removed is defined as a through hole 1a, and a metal such as zinc or solder is sprayed on the winding end surface to form the electrode lead portion 3.

The concave insulating cases 13 and 14 are large enough to cover the capacitor body 9 connected to the external lead terminals 5 and 5. Resin 12 covering the inner surface of capacitor body 9
Is determined by the size of the capacitor element 1,
It is necessary to determine appropriately so as not to impair the withstand voltage. The resin 12 is made of an insulating thermosetting resin such as an epoxy resin or a polyurethane resin. The concave insulating cases 13 and 14 shown in FIGS. 4 and 5 are made of resin such as polybutylene terephthalate, polycarbonate, and polyethylene terephthalate, or It is formed by vacuum molding of polyvinyl chloride, polycarbonate or the like.

According to the above configuration, since no insulating oil is used, vacuum drying, impregnation, and washing steps are not required, and the construction period can be greatly reduced. Can be achieved. In addition, the outer peripheral portion of the side surface of the capacitor element is covered with an insulating insulator, and the winding end surface portion of the capacitor body and the side surface of the capacitor body are concavely covered with an insulating resin including a concave insulating case and a filling resin. Therefore, there is no decrease in the dielectric strength, and a metal container is unnecessary, and the size and weight can be reduced. Further, since the insulating rod is inserted into the through hole at the center of the plurality of capacitor elements connected in series, the capacitor elements are aligned in a straight line without meandering, and can be manufactured with high dimensional accuracy. . Furthermore, the thickness of the filling resin between the outer peripheral portion of the side surface of the capacitor element and the insulator becomes uniform, so that a decrease in withstand voltage can be prevented, and the quality can be stabilized. Further, since the screw portion is formed on the insulating rod projecting from the concave insulating case, the insulating rod can be externally mounted by the screw portion.

Embodiment 2 FIGS. 2A and 2B show another embodiment of the dry metallized film capacitor of the present invention, wherein FIG. 2A is a plan view, FIG. 2B is a longitudinal sectional view, and FIG. FIG. 6 is a drawing of another embodiment of the concave insulating case of the present invention,
(A) is a plan view, and (b) is a longitudinal sectional 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. What differs from the above-described embodiment is the configuration of the concave insulating case, the external lead-out terminal, and the insulating rod.

A thread 8a is provided only at one end of the insulating rod 8 inserted into the through hole 1a at the center of the capacitor element 1 forming the capacitor element body 9, and one external lead-out terminal is provided. Reference numeral 6 designates a hole 6a to be inserted into the insulating rod 8, and other external lead-out terminals 7 are connected to the connecting part 7b and the insulating rod 8 which are insulated except for the tip part connected to the electrode lead-out part 3 of the capacitor element 1. And an external terminal 7a having a hole 7c that is inserted through the insulating rod. The concave insulating case 15 has only an insulating rod through hole 15a through which the insulating rod 8 is inserted.

The above-mentioned capacitor element body 9 is formed, and the external lead terminals 6 and 7 are inserted into an insulating rod 8 through an insulating interposer 16 made of polyacetal, polyamide, glass-filled epoxy resin, or the like. It is connected to the winding end face of the body 9, the external lead-out terminal is pulled out from the same direction, the concave insulating case 15 is covered only on the side opposite to the external lead-out terminals 6, 7, and the insulation with the external lead-out terminals 6, 7 Opening 4a of object 4
The filling resin 12 is filled from the side and hardened, the lower concave insulating case 15 and the capacitor element 9 are fixed, the inner surface of the capacitor element 9 is filled with the filling resin 12, and the external lead-out terminals 6, 7 is fixed with the filling resin 12.

According to the above configuration, the same effect as in the first embodiment is obtained. Further, the external lead-out terminal is pulled out from the same direction, and the insulating rod having the screw portion protrudes from the concave insulating case. External mounting can be performed by this screw portion.

In the above embodiment, the length of the insulating rod forming the capacitor body is made longer than that of the capacitor element connected in series, and it is made to protrude from the concave insulating case. The same effect can be obtained even if the length of the capacitor element is made substantially equal to that of the capacitor element connected in series and does not protrude from the concave insulating case. Also, a hole to be inserted through the insulating rod was formed in the external lead terminal, and the external lead terminal was pulled out through the insulating rod.However, the external lead terminal was pulled out directly without passing through the insulating rod. The same effect can be obtained. Further, the shape of the capacitor element may be either a round shape or an elliptical shape, as long as the shape has a through hole through which an insulating rod can be inserted at the center of the capacitor element.

[0021]

As is clear from the above embodiment, since the dry metallized film capacitor of the present invention does not use insulating oil, vacuum drying, impregnation and washing steps are not required, and the construction period can be greatly reduced. Further, the quality can be stabilized without deterioration of characteristics due to oil leakage of the insulating oil. In addition, the outer peripheral portion of the side surface of the capacitor element is covered with an insulating insulator, and the winding end surface portion of the capacitor body and the side surface of the capacitor body are concavely covered with an insulating resin including a concave insulating case and a filling resin. Therefore, there is no decrease in the dielectric strength, and a metal container is unnecessary, and the size and weight can be reduced. In addition, since the insulating rod is inserted into the through hole at the center of the plurality of capacitor elements connected in series, the capacitor elements are aligned in a straight line without meandering, thereby improving dimensional accuracy. it can. Furthermore, the thickness of the filling resin between the outer peripheral portion of the side surface of the capacitor element and the insulator becomes uniform, so that a decrease in withstand voltage can be prevented, and the quality can be stabilized. Further, by forming a threaded portion on the insulating rod protruding from the concave insulating case, external mounting can be performed, and the value is industrially and practically large.

[Brief description of the drawings]

FIG. 1 is a drawing showing an embodiment of a dry metallized film capacitor of the present invention, wherein (a) is a plan view, (b) is a longitudinal sectional view, 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 plan view, (b) is a longitudinal sectional view, and (c) is a bottom view.

FIGS. 3A and 3B are drawings of the capacitor body constituting FIG. 1, wherein FIG. 3A is a longitudinal sectional view and FIG. 3B is a side view.

FIG. 4 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. 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 another embodiment of the concave insulating case of the present invention, wherein (a) is a plan view and (b) is a longitudinal sectional view.

FIG. 7 is a perspective view of one embodiment of the capacitor element 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 1a Through-hole 2 Metallized film 3 Electrode lead-out part 4 Insulator 4a Opening part 5 External lead-out terminal 6 External lead-out terminal 6a Hole 7 External lead-out terminal 7a External terminal 7b Connection part 8 Insulating rod 8a Screw part 9 Capacitor element 10 Internal lead-out terminal 11 Insulating material 12 Filled resin 13 Concave insulating case 13a Insulating rod through hole 13b Terminal through hole 13c Resin injection port 14 Concave insulating case 14a Insulating rod through hole 14b Terminal through hole 15 Concave insulating Case 15a Insulation rod through hole 16 Insert

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tohru Nakaji 1st floor of 191 Nakasu-ri-cho, Uikehara Building, 3rd floor, Uchihara Building, Nichicon Co., Ltd. F-term in Nichicon Corporation 5E082 AB04 BC39 CC06 CC12 EE07 FG06 GG08 HH02 HH22 HH23 HH25 HH28 HH47 JJ04 JJ22 KK07

Claims (4)

[Claims] 1. A pair of metallized films are stacked and wound,
A capacitor element formed by serially connecting a capacitor element formed by spraying a metal to the wound end face, inserting an insulating rod into a through hole of the element, and covering an outer peripheral portion of a side surface of the element with an insulator; It consists of an external lead-out terminal connected to the winding end face of the body,
A dry metallized film capacitor, characterized in that at least one of the wound end surfaces of the element body is insulated in a concave shape, and at least one of the insulating rods is projected from the insulated insulating cover portion. 2. The dry metallized film capacitor according to claim 1, wherein a resin is filled between the capacitor element and the insulator. 3. The method according to claim 1, wherein the material of the concave insulating covering portion comprises a concave insulating case and a filling resin.
Or a dry metallized film capacitor according to claim 2. 4. The dry metallized film capacitor according to claim 1, wherein at least one of the insulating rods protruding from the concave insulating case is provided with a screw portion.