JP4386392B2 - 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 insulating oil, insulating gas, and a metal container, and the outer periphery of the side surface of the capacitor element A plurality of capacitor bodies formed by coating with an insulator are connected in parallel with external lead terminals to form an aggregate, the winding end surface of the aggregate, the side surface of the capacitor element, and the pair of concave shapes The present invention provides a small, lightweight dry metallized film capacitor that is filled with an insulating resin between an insulating case and a heat sink is interposed between capacitor bodies forming the aggregate.
[0005]
That is, wound overlapping a pair of metallized film 2, a plurality of capacitor elements 1 formed by thermally spraying a metal connected in series to the winding end face, covering the side surface outer periphery of the capacitor element 1 with an insulator 4 The capacitor element body 6, the assembly 7 in which the winding end face portions of the capacitor element body 6 are connected in parallel by the external lead-out terminals 5, and the heat dissipation interposed between the capacitor element bodies 6 of the assembly 7. a plate 9, a pair of concave insulative case 16 covering the winding end face and the side face of the capacitor element body 6 of the assembly 7, is provided with a resin injection port 12b and the terminal through-hole 12a, the terminal for external lead 5 is formed with the same size as the positioning insulating plate 12 while being provided with the positioning insulating plate 12 through which the terminal through hole 12a is inserted and the heat radiating plate through hole 17a. 9 through the heat sink 17 And a concave insulating plate 11 inserted between the upper end of the assembly 7 and the external lead terminal 5, and a positioning insulating plate on the inner walls of the pair of concave insulating cases 16. 12 and the support plate 17 are in contact with each other, the filling resin is filled between the winding end surface portion of the assembly 7 and the side surface of the capacitor body 6 and the pair of concave insulating cases 16, and the resin injection port 12b. The external lead-out terminal 5 and the concave insulating plate 11 are fixed by the resin injected from .
[0006]
The insulator 4 covering the outer peripheral portion of the side surface of the capacitor element 1 is provided with a through hole, and the resin 15 is filled between the capacitor element 1 and the insulator 4 through the through hole. It is said.
[0009]
In addition, an insulating sheet 19 is interposed between the two external lead-out terminals 5 so as to face each other.
[0010]
Further, the heat radiating fins 18 are attached to the heat radiating plate 9.
[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 capacitor bodies in which the outer periphery of the side surface of the element is coated with an insulator are connected in parallel with external lead terminals to form an aggregate. A heat sink is inserted between the capacitor bodies forming the aggregate, and the winding end surface portion of the aggregate and the side surface of the aggregate are covered with a concave insulating case and a filling resin in a concave shape.
Compared with the conventional method of filling and sealing insulating oil and insulating gas into a metal container, it is possible to produce a small, light-weight dry metallized film capacitor, and it does not require a filling and sealing process. Can be reduced. Furthermore, the temperature rise of a capacitor | condenser 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 11 and formed into a concave shape shown in Figure 9 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 12a of the epoxy resin positioning insulating plate 12 shown in FIG. 8 and pulled outward (FIG. 1B). Further, the heat radiating plate 9 extending from the lower end portion of the assembly is inserted into the heat radiating plate through hole 17a of the epoxy resin support plate 17 shown in FIG.
Next, a support plate 17 in which the concave insulating case 16 shown in FIG. 7 is connected to the assembly 7 formed by connecting the external lead terminals 5 , the concave insulation plate 11, the positioning insulating plate 12, and the lower end portion of the assembly 7. Then, the positioning insulating plate 12 and the support plate 17 are brought into contact with the inner wall of the concave insulating case, respectively, and the filling resin 14 is filled and cured therebetween. Further, the resin 15 is injected from the resin injection port 12b, and the external lead terminal portion 5c, which is a connection portion between the connection portion 5a of the external lead terminal 5 and the external terminal 5b, and the concave insulating plate 11 are fixed with the resin 15. To do.
[0014]
The assembly 7 shown in FIG. 3 has a heat sink 9 shown in FIG. 5 interposed between a plurality of capacitor bodies 6 and is fixed with an epoxy or silicon putty-like adhesive 10 and is subjected to tin plating or the like. Electrode lead-out portions of a plurality of capacitor elements 6 connected in series to a connection portion 5a provided with a round hole 5d made of copper, brass or the like and a connection portion 5a of an external lead-out terminal 5 comprising an external terminal 5b 3 are connected in parallel.
The capacitor body 6 of FIG. 4 is formed by connecting a plurality of capacitor elements 1 in series with internal lead-out terminals 8 and covering the outer peripheral portion of the side face of the capacitor elements 1 connected in series with an insulator 4.
The insulator 4 is formed by winding an insulating sheet of polyethylene terephthalate, polypropylene, polyimide or the like in a shape with a size that allows the capacitor element 1 to pass therethrough, 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 4a. The position of the through hole 4a is a place where the capacitor elements 1 are connected in series, and the number of the through holes 4a is one less than the number of the capacitor elements 1.
Further, the resin 15 is filled and cured between the capacitor element 1 and the insulator 4 through the through hole 4a.
[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, the electrode lead-out portion 3 is formed by winding a polypropylene film, a polyethylene terephthalate film, or the like as a post-winding film and spraying a metal such as zinc or solder on the winding end face.
[0016]
The heat radiating plate 9 shown in FIG. 5 is made of aluminum. A circuit is printed on one aluminum plate with an anti-crimping material, the plates are overlapped, rolled and pressed, and the circuit is expanded with high-pressure air. The fixing hole 9a is formed by sealing and injecting water or a solvent having a cooling effect as a coolant.
[0017]
The concave insulating case 16 is sized to cover the assembly 7 connected to the connection portion 5a of the external lead terminal 5 and the like. Since the thickness of the filling resin 14 covering the side surface of the assembly 7 is determined by the size of the positioning insulating plate 12, the dimension of the positioning insulating plate 12 is set so that the electrode lead-out portions 3 at both ends of the capacitor body 6 are not exposed. It is necessary to decide appropriately. Further, in order to finish accurately, the filling resin 14 is filled by bringing the support plate 17 having the same size as the positioning insulating plate 12 and having the heat radiating plate through hole 17a into contact with the inner wall of the concave insulating case 16.
The filling resin 14 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 16 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 portion where the capacitor 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 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-out terminal portion and the concave insulating plate are fixed with resin, there is no decrease in dielectric strength, and no metal container is required, and the size and weight can be reduced.
Further, it is possible to prevent deterioration of characteristics at the external lead terminal portion for a long time use, and it has a strength sufficient to withstand the external force applied to the external lead terminal.
In addition, the positioning insulating plate and support plate of the same size are in contact with the inner wall of the concave insulating case, and the external lead-out terminals are pulled out from the terminal through-holes of the positioning insulating plate. The accuracy between the dimensions and the outer dimensions 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]
Insulating sheet 19 made of adhesive or non-adhesive polyethylene terephthalate, polypropylene, polyimide, or the like is interposed between the external terminals 5b forming the external lead terminals 5 and positioned so as to face each other. It is inserted through the terminal through hole 12a of the insulating plate 12 and pulled outward.
The heat dissipating fins 18 are formed by extrusion-molding aluminum as shown in FIG. 6. The heat dissipating fins 18 have fixing holes 18a, and are attached to the fixing holes 9a of the heat radiating plates via bolts 20 and nuts 21. Although FIG. 2 shows the case where two radiating fins 18 are attached, one may be used.
[0021]
According to said structure, it has the same effect as Example 1, Furthermore, since an insulating sheet is inserted between the terminals for external drawing, and it arrange | positions oppositely and is drawn out, it aims at low inductance. Can do.
Moreover, the heat radiation area is increased by attaching the heat radiation fins, and the heat generated by the capacitor can be dissipated to the outside more quickly and the temperature rise can be reduced.
[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 can be further reduced. It is possible to dissipate outside and 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, the positioning insulating plate and support plate of the same size are in contact with the inner wall of the concave insulating case, and the external lead-out terminal is pulled out from the terminal through hole of the positioning insulating plate, making assembly work easy. Thus, the accuracy of the pitch dimension and the outer dimension can be improved.
Furthermore, if an insulating sheet is inserted between the external lead terminals and the structure is arranged oppositely and drawn outward, there is an advantage such as low inductance, and the value is industrially and practically useful. There is something very big.
[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 2 Metallized film 3 Electrode extraction part 4 Insulator 4a Through hole 5 External lead terminal 5a Connection part 5b External terminal 5c External lead terminal part 5d Round hole 6 Capacitor base body 7 Assembly 8 Internal lead terminal 9 Radiation plate 9a Fixing hole 10 Adhesive 11 Insulation plate 12 Positioning insulation plate 12a Terminal through hole 12b Resin inlet 13 Insulating material 14 Filling resin 15 Resin 16 Concave insulating case 17 Support plate 17a Radiation plate through hole 18 Radiation fin 18a Fixing hole 19 Insulating sheet 20 Bolt 21 Nut

Claims (4)

A capacitor body formed by stacking and winding a pair of metallized films, serially connecting a plurality of capacitor elements formed by spraying metal on the winding end face, and covering the outer peripheral portion of the side surface of the capacitor element with an insulator; , An assembly formed by connecting the winding end face portions of the capacitor body in parallel with an external lead terminal;
A heat sink interposed between the capacitor bodies of the aggregate;
A pair of concave insulative case for covering the winding end face and the side face of the capacitor body of the assembly,
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. The dry metallized film capacitor according to claim 1 or 2 , wherein an insulating sheet is interposed between the two external lead-out terminals and arranged opposite to 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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