JP4386382B2 - Dry metallized film capacitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dry metallized film capacitor that uses a metallized film and does not use insulating oil, and ensures the protection of internal elements.
[0002]
[Prior art]
Conventional metallized film capacitors used for rolling stock, industrial equipment such as rolling mills, direct current power transmission, power factor improvement, etc. use a metallized film in which aluminum is vapor-deposited on a polypropylene film, impregnated with insulating oil. Metallized film capacitors were used.
[0003]
[Problems to be solved by the invention]
The metallized film capacitor described above is an assembly of capacitor elements provided with electrode lead-out portions, surrounded by a surrounding insulating material to form an element body, housed in a metal container via the insulating material, and combustible insulating oil. Because it is impregnated, it is large, heavy and easy to burn. Therefore, recently, there has been an increasing demand for a small and lightweight dry capacitor that does not use flammable insulating oil for the purpose of disaster prevention.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem of large size, heavy weight, and flammability, the present invention forms a body by connecting a plurality of capacitor elements in parallel with internal lead terminals without using insulating oil and insulating gas. The small and lightweight assembly in which the filled resin is filled and cured between the end surface portion and the side surface portion of the element body and the pair of concave insulating cases is stored in a metal container, and the aggregate is fixed with the resin. A dry metallized film capacitor is provided.
[0005]
That is, an element body 6 in which a pair of metallized films 2 are overlapped and wound, and winding end surface portions of a plurality of capacitor elements 1 formed by spraying metal on the winding end surfaces are connected in parallel by internal lead-out terminals 5; a pair of concave insulative case 9 covering the end face and the side face of the plain body 6, in contact with the inner wall of the pair of recessed insulating case 9, a pair of support provided to sandwich the body 6 An assembly 12 including a plate 11 is accommodated in a metal container 13, and the assembly 12 is filled between the end surface portion and the side surface portion of the element body 6 and the pair of concave insulating cases 9. Is formed by filling and curing the resin 15 in the inner bottom portion of the metal container 13 and fixing the assembly 12 in the metal container 13.
[0006]
Further, the outer peripheral portion of the side surface of the capacitor element 1 is covered with an insulator of any one of a thermoplastic adhesive tape, a resin-impregnated thermosetting tape, a flame retardant adhesive tape, and a heat shrinkable tape .
[0007]
Further, one or more layers of the side surface outer peripheral portion excluding the surface of the electrode lead portion connected by the internal lead terminal forming the element body 6 with a side face protective insulator made of a heat resistant film or a flame retardant sheet. It is characterized by winding and covering.
[0008]
The insulating resin 10 includes a concave insulating case 9 and a filling resin 8.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Capacitor elements with a plurality of side surfaces coated with an insulator coated with metal on the winding end face are connected in parallel with internal lead-out terminals to form an element body, which is insulated from the end face and side faces of the element body. The assembly covered with the conductive resin is housed in a metal container provided with external terminals, and the assembly is fixed with resin.
A small and lightweight dry metallized film capacitor that does not use insulating oil and insulating gas can be produced, and a filling and sealing process is not required, and the number of steps can be reduced.
Furthermore, by storing the above assembly in a metal container, protection of the internal elements is ensured.
[0010]
【Example】
[Example 1]
FIG. 1 is a longitudinal sectional view showing an embodiment of a dry metallized film capacitor of the present invention, FIG. 3 is a drawing of an assembly constituting FIG. 1, (a) is a plan view, (b) is a longitudinal sectional view, (C) is a side view in which one side filled resin and the concave insulating case are removed, FIG. 4 is a drawing of the element body constituting FIG. 3, (a) is a plan view, (b) is a front view, ( c) is a side view, FIG. 6 is a drawing of an embodiment of a concave insulating case, (a) is a plan view, and (b) is a sectional view.
FIG. 7 is a perspective view in which the outer peripheral portion of the side surface of the capacitor element in which the electrode lead portion is formed on the winding end face is covered with an insulator, and FIG. 8 is a drawing in which a pair of metallized films is developed.
[0011]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The dry metallized film capacitor shown in FIG. 1 covers a concave insulating case 9 shown in FIG. 6 on an element body 6 connected by an internal lead-out terminal 5 and a support plate 11, and the inner wall of the concave insulating case. The assembly 12 formed by bringing the support plate 11 into contact with the resin and filling and curing the filling resin 8 therebetween is housed in the metal container 13, and the resin 15 is filled and cured therebetween, and is pulled out from the assembly 12. The internal lead-out terminal 5 connected to the external terminal 14 provided in the metal container 13 is connected.
[0012]
The element body 6 of FIG. 4 is formed by connecting in parallel the internal lead-out terminal 5 provided with a round hole 5a made of copper, brass, etc. with tin plating to the electrode lead-out portions 3 of the plurality of capacitor elements 1. ing.
Capacitor element 1 is formed by winding metallized film 2 made of a pair of metallized polypropylene film, metallized polyester film, etc. shown in FIG. Alternatively, the electrode lead-out portion 3 is formed by winding a polypropylene film, a polyester film or the like as a post-wound film and spraying a metal such as zinc or solder on the winding end face.
[0013]
As shown in FIG. 7, the insulator 4 is a thermosetting pressure-sensitive adhesive tape in which the outer peripheral portion of the side surface of the capacitor element 1 is impregnated with a thermoplastic pressure-sensitive adhesive tape such as polyester, polypropylene or polyimide, or a resin such as unsaturated polyester or epoxy, or difficult. The flame-resistant adhesive tape is wound a plurality of times or covered with a heat-shrinkable tube such as vinyl chloride, polyester, cross-linked polyethylene, or silicon rubber and heat-shrinked.
[0014]
The concave insulating case 9 is large enough to cover the element body 6 connected to the internal lead-out terminal 5. 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 filled between the element body 6 and the concave insulating case 9.
Further, 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. Alternatively, it is formed by vacuum forming such as polyvinyl chloride or polycarbonate.
[0015]
According to the above configuration, since no insulating oil or insulating gas is used, vacuum drying, impregnation and cleaning steps are unnecessary, and the construction period can be greatly shortened. Furthermore, due to oil leakage of insulating oil or insulating gas leakage There is no characteristic deterioration and the quality can be stabilized.
In addition, the outer peripheral portion of the side surface of each capacitor element is covered with an insulating insulator, and the end surface portion and side surface portion of the element body are covered with an insulating resin composed of a concave insulating case and a filling resin. The container and the assembly can be reliably insulated, and the dielectric strength does not decrease.
Furthermore, since the assembly is fixed to the metal container with resin, the assembling work is simple and robust, the internal elements are reliably protected, and the vibration resistance is improved.
[0016]
[Example 2]
2 is a longitudinal sectional view showing another embodiment of the dry metallized film capacitor of the present invention, FIG. 5 is a drawing of the assembly constituting FIG. 2, (a) is a plan view, and (b) is a longitudinal section. FIG. 4C is a side view in which one side of the filling resin and the concave insulating case are removed. In the figure, the same reference numerals as those in FIG. The difference from the above-described embodiment is that the side surface outer peripheral portion of the element body is covered with a side surface protective insulator.
[0017]
The side surface 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 electrode extraction portion 3 connected by the internal extraction terminal 5 forming the element body 6. One or more layers of the outer peripheral portion of the side surface excluding this surface are wound with the side surface protective insulator 7, and the end surface is filled with the filling resin 8 and cured.
[0018]
According to said structure, it has the same effect as Example 1, Furthermore, since the side surface outer peripheral part of an element | base_body is coat | covered with the heat-resistant or a flame-resistant side surface protective insulator, by any chance in a capacitor | condenser element Even if an abnormality occurs and the capacitor element melts and elutes, it can be protected by this side surface protective insulator, and a short circuit with the metal container can be prevented.
[0019]
【The invention's effect】
As is clear from the above examples, the dry metallized film capacitor of the present invention does not use insulating oil or insulating gas, so that vacuum drying, impregnation and cleaning steps are unnecessary, and the construction period can be greatly shortened. Furthermore, there is no characteristic deterioration due to oil leakage of insulating oil or insulating gas, and quality can be stabilized. Further, the outer peripheral portion of the side surface of each capacitor element is covered with an insulating material such as a thermoplastic adhesive tape, a resin-impregnated thermosetting tape, a flame retardant adhesive tape, or a heat-shrinkable tape, and the end surface portion and the side surface portion of the element body. Is covered with an insulating resin composed of a concave insulating case and a filling resin, the metal container and the assembly can be reliably insulated, and the dielectric strength is not reduced. Furthermore, since the assembly is fixed to the metal container with a resin, the assembling operation is simple and robust, the internal elements are reliably protected, and the vibration resistance is improved. Then, one or more layers of the outer peripheral surface of the side surface except for the surface of the electrode extraction portion connected by the internal extraction terminal forming the element body are wound with a side surface protective insulator made of a heat resistant film or a flame retardant sheet . since the covers, Kitashi the abnormal event capacitor element, the advantages of such a capacitor element is melted, even if eluted protected with this aspect protective insulator, it is possible to prevent a short circuit between the metal container There is a great value in industrial and practical use.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an 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.
3 is a drawing of the assembly constituting FIG. 1. FIG. 3 (a) is a plan view, FIG. 3 (b) is a longitudinal sectional view, and FIG. It is a side view.
4 is a drawing of the element body constituting FIG. 3, wherein (a) is a plan view, (b) is a front view, and (c) is a side view. FIG.
5 is a drawing of the assembly constituting FIG. 2, wherein (a) is a plan view, (b) is a longitudinal sectional view, and (c) is one side filled resin and a concave insulating case removed. It is a side view.
6A and 6B are drawings of an embodiment of a concave insulating case according to the present invention, in which FIG. 6A is a plan view and FIG. 6B is a cross-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 is developed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Metallized film 3 Electrode extraction part 4 Insulator 5 Internal extraction terminal 5a Round hole 6 Element body 7 Side surface 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

Claims (3)

A base body in which a pair of metallized films are stacked and wound, and winding end surface portions of a plurality of capacitor elements formed by thermal spraying metal on the winding end surface are connected in parallel with internal lead-out terminals;
A pair of concave insulating cases covering the end face part and the side face part of the element body ;
A pair of support plates that are in contact with the inner walls of the pair of concave insulating cases and sandwich the element body;
Is stored in a metal container,
The assembly is formed by filling and curing a filling resin between an end surface portion and a side surface portion of the element body and the pair of concave insulating cases, and filling an inner bottom portion of the metal container with a resin, A dry metallized film capacitor, which is cured and resin-fixed in the metal container. 2. The dry metal according to claim 1, wherein the outer peripheral portion of the side surface of the capacitor element is covered with an insulator of any one of a thermoplastic adhesive tape, a resin-impregnated thermosetting tape, a flame retardant adhesive tape, and a heat shrinkable tape. Film capacitor. One or more layers are wound with a side protective insulator made of a heat-resistant film or a flame-retardant sheet on the outer peripheral surface of the side surface excluding the surface of the electrode lead-out portion connected by the internal lead-out terminal forming the element body , The dry metallized film capacitor according to claim 1 or 2, wherein the capacitor is coated.

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