JP4384718B2 - Dry metallized film capacitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dry-type metallized film capacitor that uses a metallized film and does not use insulating oil or a metal container.
[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 above metallized film capacitor is a collection of capacitor elements with electrode lead-out parts, surrounded by an insulating material to form an element body, housed in a metal container via the insulating material, and impregnated with flammable insulating oil It is large, heavy, and easy to burn. Further, since no heat radiating means was provided for the temperature rise of the capacitor element, the above-mentioned problem of flammability was insufficient.
[0004]
[Means for Solving the Problems]
In order to solve the problem that the present invention is large, heavy and flammable, a plurality of capacitor elements are connected in series without using an insulating oil, insulating gas, and metal container, and through the insulating rod of the capacitor element An insulating rod is inserted into the hole, and a plurality of capacitor bodies in which the outer periphery of the side surface of the capacitor element is covered with an insulating material are connected in parallel with an external lead terminal to form an aggregate, and the winding of the aggregate A small size in which a gap between the end face part and the side surface of the element body and the pair of concave insulating cases is filled with an insulating resin, and a heat sink is interposed between the capacitor element bodies forming the aggregate, A lightweight dry metallized film capacitor is provided.
[0005]
That is, a pair of metallized films 2 are overlapped and wound, a plurality of capacitor elements 1 formed by spraying metal on the winding end face are connected in series, and the insulating rod 4 is inserted into the insulating rod through hole 1a of the capacitor element 1. insertion, and has a plurality of capacitor element 7 formed by covering the side surface outer periphery of the capacitor element 1 with an insulator 5, the winding end face of said plurality of capacitor body 7 in the lead-out terminals 6 The assembly 8 formed in parallel, the heat sink 10 interposed between the capacitor bodies 7 of the assembly 8, and a pair of covers that cover the winding end surface portion of the assembly 8 and the side surfaces of the capacitor body 7 A concave insulating case 17, a resin injection port 13b and a terminal through hole 13a are provided, and a positioning insulating plate 13 through which the external lead-out terminal 6 is inserted into the terminal through hole 13a and a heat radiating plate through hole 18a are provided. Same size as positioning insulating plate 13 Between the upper end portion of the assembly 8 and the external lead-out terminal 6. The support plate 18 is disposed at the lower end portion of the capacitor body 7 and protrudes the heat radiating plate 10 from the heat radiating plate through hole 18 a. A positioning insulating plate 13 and a support plate 18 are in contact with the inner walls of a pair of concave insulating cases 17, and a winding end surface portion of the assembly 8 and a side surface of the capacitor element body 7 are provided. The filling resin is filled between the pair of concave insulating cases 17, and the external lead terminal 6 and the concave insulating plate 12 are fixed by the resin injected from the resin injection port 13b. Yes.
[0006]
The insulator 5 covering the outer peripheral portion of the side surface of the capacitor element 1 is provided with a through hole, and the resin 16 is filled between the capacitor element 1 and the insulator 5 through the through hole. It is said.
[0009]
Further, an insulating sheet 20 is interposed between the external lead terminals 6 so that the terminals are brought into close contact with each other.
[0010]
Furthermore, the heat radiating fins 19 are attached to the heat radiating plate 10.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A plurality of capacitor elements formed by spraying metal on the winding end face are connected in series, and an insulating rod is inserted through the insulating rod through hole of the capacitor element formed in series, and the outer peripheral portion of the side surface of the element is covered with an insulator. A plurality of capacitor bodies are connected in parallel with external lead terminals to form an assembly, and a heat sink is interposed between the capacitor bodies forming the assembly, and the assembly body is wound. An insulating resin is coated in a concave shape on the end surface and the side surface of the element body. Since a metal container is not filled and sealed with insulating oil or insulating gas, a small, lightweight dry metalized film capacitor can be produced, and the filling and sealing process is not required, reducing the number of man-hours. be able to. Furthermore, the temperature rise of the capacitor can be reduced by inserting a heat sink.
[0012]
【Example】
[Example 1]
FIG. 1 is a drawing showing an embodiment of the dry metallized film capacitor of the present invention, in which (a) is a partial right sectional view, (b) is a longitudinal sectional view, (c) is a right side partial sectional view, d) is a bottom view, FIG. 3 is a drawing of the assembly constituting FIG. 1, (a) is a plan view, (b) is an AA cross-sectional view, and (c) is a right side partial cross-sectional view. 4 is a drawing of the capacitor body constituting FIG. 3, wherein (a) is a longitudinal sectional view and (b) is a side view.
7 is a drawing of an embodiment of a concave insulating case, (a) is a plan view, (b) is a longitudinal sectional view, and FIG. 11 is a perspective view of a capacitor element in which an electrode lead portion is formed on a winding end face. FIG. 12 is a developed view of a pair of metallized films.
[0013]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Dry metallized film capacitor shown in FIG. 1, insert the epoxy made of insulating plate 12 is molded in a concave shape shown in Figure 9 between the upper end portion and the external lead terminals 6 of the assembly 8 shown in FIG. 3, the external terminal 6b is inserted through the terminal through hole 13a of the epoxy resin positioning insulating plate 13 shown in FIG. 8 and pulled outward (FIG. 1 (b)). Further, the heat radiating plate 10 extending from the lower end of the assembly is inserted into the heat radiating plate through hole 18a of the epoxy resin support plate 18 shown in FIG.
Next, a support plate 18 in which a concave insulating case 17 shown in FIG. 7 is connected by an external lead terminal 6 , an assembly 8, a concave insulating plate 12, a positioning insulating plate 13, and a lower end portion of the assembly 8. The positioning insulating plate 13 and the support plate 18 are brought into contact with the inner wall of the concave insulating case, respectively, and the filling resin 15 is filled and cured therebetween. Further, the resin 16 is injected from the resin injection port 13b, and the external lead terminal portion 6c, which is a connection portion between the connection portion 6a of the external lead terminal 6 and the external terminal 6b, and the concave insulating plate 12 are fixed by the resin 16. To do.
[0014]
The assembly 8 shown in FIG. 3 has a heat sink 10 shown in FIG. 5 interposed between a plurality of capacitor bodies 7 and is fixed with an epoxy or silicon putty-like adhesive 11 and is subjected to tin plating or the like. An electrode lead-out portion of a capacitor element body 7 which is connected in series to a connection portion 6a provided with a round hole 6d made of copper, brass or the like and a connection portion 6a of an external lead-out terminal 6 comprising an external terminal 6b. 3 are connected in parallel.
Capacitor body 7 in Figure 4, a plurality of capacitor elements 1 are connected in series with the internal lead terminal 9, the insulating rod through hole 1a which is provided in the central portion of the element polyacetal, polyamide, glass entry epoxy resins such as An insulating insulating rod 4 made of is inserted, and the outer peripheral portion of the side surface of the capacitor element 1 connected in series is covered with an insulator 5.
The insulator 5 is formed by winding an insulating sheet such as polyethylene terephthalate, polypropylene, polyimide, etc., in a shape that allows the capacitor element 1 to be inserted therein a plurality of times, or is made of polybutylene terephthalate, polycarbonate, polyvinyl chloride, or the like. It consists of an insulating pipe and has a plurality of through holes 5a. The position of the through hole 5a is a place where the capacitor elements 1 are connected in series, and the number of the through holes 5a is one less than the number of the capacitor elements 1.
Further, the resin 16 is filled and cured between the capacitor element 1 and the insulator 5 through the through hole 5a.
[0015]
Capacitor element 1 is formed by winding metallized film 2 made of a pair of metallized polypropylene film, metallized polyester film, or the like shown in FIG. Alternatively, it is wound with a polypropylene film, a polyethylene terephthalate film or the like as a post-wound film, formed in a shape having an insulating rod through hole 1a at the center, and sprayed with a metal such as zinc or solder on the winding end surface to form an electrode lead portion 3 Is forming.
[0016]
The heat radiation plate 10 shown in FIG. 5 is made of aluminum, and a circuit is printed on one aluminum plate with an anti-crimping material, the plates are overlapped, rolled and pressure-bonded, and the circuit is expanded with high-pressure air. The fixing hole 10a is formed by sealing water by injecting water or a solvent having a cooling effect as a refrigerant.
[0017]
The concave insulating case 17 is sized to cover the assembly 8 connected to the connection portion 6a of the external lead terminal 6 and the like. Since the thickness of the filling resin 15 covering the side surface of the assembly 8 is determined by the size of the positioning insulating plate 13, the dimension of the positioning insulating plate 13 is set so that the electrode lead portions 3 at both ends of the capacitor body 7 are not exposed. It is necessary to decide appropriately. Further, in order to finish accurately, the filling resin 15 is filled by bringing the support plate 18 having the same size as the positioning insulating plate 13 and having the heat radiating plate through hole 18 a into contact with the inner wall of the concave insulating case 17.
The filling resin 15 and the resin 16 are made of an insulating thermosetting resin such as an epoxy resin or a polyurethane resin, and the concave insulating case 17 shown in FIG. 7 is formed by resin molding using polybutylene terephthalate, polycarbonate, polyethylene terephthalate, or the like. It is formed by vacuum forming such as vinyl chloride or polycarbonate.
[0018]
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, a heat sink is inserted between a plurality of capacitor bodies, and the heat sink protrudes from the heat sink through hole of the support plate sandwiched between the concave insulating cases. The plate is cooled by the outside air, and the generated heat can be dissipated to the outside to reduce the temperature rise of the capacitor.
Furthermore, the outer periphery of the side surface of each capacitor element is covered with an insulating insulator, the connection part where the condenser elements are connected in series is filled with resin, and the winding end surface portion of the assembly and the side surface of the capacitor element body are covered. Cover in a concave shape with an insulating resin consisting of a concave insulating case and a filling resin, insert the concave insulating plate between the upper end of the assembly and the external lead-out terminal, and resin from the resin inlet of the positioning insulating plate Since the external lead terminal and the concave insulating plate are fixed with resin, there is no reduction in dielectric strength, no metal container is required, and the size and weight can be reduced. It is possible to prevent deterioration of characteristics at the lead-out terminal portion, and to withstand the external force applied to the external lead-out terminal.
In addition, since the insulating rod is inserted into the insulating rod through hole of the capacitor element connected in series, and the outer periphery of the side surface of the element is covered with an insulating insulator to form a capacitor element body, the dimension of the element body is A stable and stable capacitor body is connected in parallel to form an assembly, and a positioning insulating plate and a support plate of the same size are brought into contact with the inner wall of the concave insulating case, respectively. Since the external lead-out terminal is pulled out more, the assembling work is simple and the accuracy of the pitch dimension and the outer dimension can be increased.
[0019]
[Example 2]
FIG. 2 is a drawing showing another embodiment of the dry metallized film capacitor of the present invention, where (a) is a right side partial sectional view, (b) is a longitudinal sectional view, (c) is a right side partial sectional view, (D) is a bottom view. In the figure, the same reference numerals as those in FIG. 1 denote the same components, and the description thereof will be omitted. The difference from the above-described embodiment is that the structure of the external lead terminal and the radiating fin are attached to the radiating plate protruding from the support plate.
[0020]
Additional external lead terminals 6 formed to have external terminals 6b tacky or non-tacky polyethylene terephthalate during, polypropylene, interposed an insulating sheet 20 made of a sheet or film of polyimide, the external lead terminals 6 The comrades are brought into close contact with each other and inserted into the terminal through hole 13a of the positioning insulating plate 13 and pulled out outward.
As shown in FIG. 6, the heat dissipating fins 19 are made by extrusion-molding aluminum, have fixing holes 19 a, and are attached to the fixing holes 10 a of the heat radiating plates via bolts 21 and nuts 22. Although FIG. 2 shows a case where two radiating fins 19 are attached, one may be used.
[0021]
According to said structure, it has the same effect as Example 1, Furthermore, since an insulation sheet is inserted between the external lead-out terminals and the external lead-out terminals are brought into close contact with each other, it is pulled out to the outside. Can be achieved.
Further, the heat radiation area is increased by attaching the heat radiation fins, and the heat generated by the capacitor can be radiated to the outside more quickly to reduce the temperature rise.
[0022]
In the above embodiment, a concave insulating plate is inserted into the upper end portion of the assembly via an external lead terminal. However, the shape of this insulating plate may be a flat plate, and between the upper end portion of the aggregate and the external lead terminal. Any shape can be used as long as it can be inserted into the external lead terminal portion and the insulating plate can be fixed with resin.
[0023]
【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. There is no characteristic deterioration due to oil leakage of insulating oil or insulating gas, and quality can be stabilized.
In addition, a heat sink is inserted between the capacitor bodies, and the heat sink is drawn out from the heat sink through hole of the support plate sandwiched between the concave insulating cases. The plate is cooled by the outside air, and the generated heat can be dissipated to the outside to reduce the temperature rise of the capacitor.Furthermore, by installing the radiation fins, the heat radiation area is increased, and the heat generated by the capacitor is much faster. Can be diffused to the outside to reduce the temperature rise.
Furthermore, the outer periphery of the side surface of each capacitor element is covered with an insulating insulator, the connection points where the capacitor elements are connected in series are filled with resin, and the winding end surface portion of the assembly and the side surface of the capacitor element are recessed. Cover in a concave shape with an insulating resin consisting of an insulating case and a filling resin, insert the insulating plate between the upper end of the assembly and the external lead terminal, and inject the resin from the resin inlet of the positioning insulating plate, Since the external lead terminal portion and the insulating plate are fixed with resin, there is no reduction in dielectric strength, and a metal container is unnecessary and can be reduced in size and weight.
And since the external lead terminal and the insulating plate are fixed with resin, the deterioration of the characteristics of the external lead terminal can be prevented during long-term use, and sufficient strength to withstand the external force applied to the external lead terminal have.
In addition, since the insulating rod is inserted into the through hole of the capacitor element connected in series and the outer peripheral portion of the side surface of the element is covered with an insulating insulator to form the capacitor element body, the dimension of the element body is stabilized. Stablely sized capacitor element bodies are connected in parallel to form an assembly, and the same size positioning insulating plate and support plate are in contact with the inner wall of the concave insulating case. Since the lead-out terminal is pulled out, assembly work is easy and the pitch dimension and the outer dimension can be accurately performed.
Furthermore, if an insulating sheet is inserted between the external lead terminals and the external lead terminals are brought into close contact with each other and drawn out, there is an advantage such as low inductance, industrial and practical use. In particular, its value is extremely large.
[Brief description of the drawings]
FIG. 1 is a drawing showing an embodiment of a dry metallized film capacitor according to the present invention, in which (a) is a partial right sectional view, (b) is a longitudinal sectional view, and (c) is a right side portion. Sectional drawing and (d) are bottom views.
FIG. 2 is a drawing showing another embodiment of the dry metallized film capacitor of the present invention, in which (a) is a partial right sectional view, (b) is a longitudinal sectional view, and (c) is a right side view. Partial sectional view, (d) is a bottom view.
3 is a drawing of the assembly constituting FIG. 1, wherein (a) is a plan view, (b) is an AA cross-sectional view, and (c) is a right side partial cross-sectional view. FIG.
4 is a drawing of the capacitor body constituting FIG. 3, wherein (a) is a longitudinal sectional view and (b) is a side view. FIG.
FIG. 5 is a drawing of an embodiment of the heat sink of the present invention, where (a) is a front view and (b) is a side view.
FIGS. 6A and 6B are drawings of an embodiment of the heat dissipating fin of the present invention, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a perspective view.
FIGS. 7A and 7B are drawings of an embodiment of a concave insulating case according to the present invention, wherein FIG. 7A is a plan view and FIG. 7B is a longitudinal sectional view.
FIG. 8 is a plan view of an embodiment of the positioning insulating plate of the present invention.
FIG. 9 is a drawing of an embodiment of the insulating plate of the present invention, where (a) is a front view and (b) is a side view.
FIG. 10 is a plan view of an embodiment of the support plate of the present invention.
FIG. 11 is a perspective view of one embodiment of a capacitor element of the present invention.
FIG. 12 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 1a Insulation rod through-hole 2 Metallized film 3 Electrode extraction part 4 Insulation rod 5 Insulator 5a Through-hole 6 External lead-out terminal 6a Wire part 6b External terminal 6c External lead-out terminal part 6d Round hole 7 Capacitor body 8 Assembly 9 Terminal 10 for internal drawing Heat sink 10a Fixing hole 11 Adhesive 12 Insulating plate 13 Positioning insulating plate 13a Terminal through hole 13b Resin inlet 14 Insulating resin 15 Filling resin 16 Resin 17 Concave insulating case 18 Support plate 18a Radiation plate through hole 19 Radiation fin 19a Fixing hole 20 Insulation sheet 21 Bolt 22 Nut

Claims (4)

Wound overlapping a pair of metallized film, a plurality of capacitor elements connected in series formed by spraying the metal in the winding end face, by inserting the insulating rod insulating rod through holes of the capacitor element, of the capacitor element a plurality of capacitor body formed by coating a side surface outer periphery of an insulating material, and aggregate formed by parallel connection of winding end face of said plurality of capacitor body with the external lead terminals,
A heat sink interposed between the capacitor bodies of the aggregate;
A pair of concave insulating cases covering the winding end surface portion of the aggregate and the side surface of the capacitor body ; and
A positioning insulating plate in which a resin injection port and a terminal through hole are provided, and the external lead-out terminal is inserted into the terminal through hole;
A support plate that is provided with a heat sink through hole and is formed to be the same size as the positioning insulating plate, and is disposed at the lower end of the capacitor body to project the heat sink from the heat sink through hole;
A concave insulating plate inserted between the upper end of the assembly and the external lead terminal;
With
The positioning insulating plate and the support plate are in contact with inner walls of the pair of concave insulating cases, and between the winding end surface portion of the assembly and the side surface of the capacitor element body, and the pair of concave insulating cases The dry metallized film capacitor is characterized in that the filling resin is filled in and the external lead terminal and the concave insulating plate are fixed by the resin injected from the resin injection port . The insulator covering the outer periphery of the side surface of the capacitor element is provided with a through hole,
The dry metallized film capacitor according to claim 1, wherein the filling resin from the through hole between the capacitor element and the insulator. 3. The dry metallized film capacitor according to claim 1 , wherein an insulating sheet is interposed between the external lead terminals and the terminals are brought into close contact with each other. 4. The dry metallized film capacitor according to claim 1 , wherein a heat radiating fin is attached to the heat radiating plate .

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