JP2005136304A - Capacitor stored in case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitor stored in a case wherein its heat radiating quality is good, and it can be manufactured easily, and further, its price can be lowered. <P>SOLUTION: The capacitor stored in a case is the one wherein a capacitor element 3 is so stored in a case 4 from an opening portion 10 as to fill a resin into the case 4. Heat radiating fins 11 are molded integrally with the case on a case-wall portion 7 opposed to the opening portion 10. The bottom wall 7 is so formed in the arcuate shape as to give to each heat radiating fin 11 a height nearly equal to the most protruding portion of the bottom wall 7. Also, both the outermost heat radiating fins 11, 11 are so provided continuously and integrally with both one-hand side walls 8, 9 of the case, and both the end surfaces of the heat radiating fins 11 are so provided in a planar way continuously with both the other-hand side walls 5, 6 of the case 4 that the substantial external shape of the case becomes nearly a rectangular parallelopiped as a whole. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cased capacitor in which a capacitor element is housed in a case and filled with resin.

An example of a conventional structure of a cased capacitor is shown in FIG. In this structure, the film capacitor element 31 is accommodated in the resin case 32 and filled with resin through the opening 33. The lead terminal 34 connected to the electrode on the end face of the capacitor element 31 protrudes from the resin surface of the opening 33 to the outside. The heat radiation of the capacitor element 31 is performed from the opening 33 of the resin case 32 and the case wall surface through the filling resin. The outer wall of the resin case 32 is a flat surface, and it is known to provide heat radiating fins on the case wall surface in order to further promote heat dissipation (for example, Patent Document 1).
Japanese Utility Model Publication No. 7-10956

  By the way, the conventional heat radiating fin is made of metal and is fixed to the wall surface of the case or directly attached to the heat generating component in the case, and the fin (heat radiating portion) is led out of the case. Since the heat radiating fin is a separate component from the case, the number of manufacturing steps is increased, and cost reduction is difficult.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a cased capacitor that has good heat dissipation, can be easily manufactured, and can be reduced in cost.

  Accordingly, the case-filled capacitor according to the first aspect of the present invention is a case-filled capacitor in which the capacitor element 3 is accommodated in the case 4 through the opening 10 and filled with resin. 11 is integrally formed.

  In the case-containing capacitor according to claim 2, the case bottom wall 7 is formed in an arc shape, and the heat radiation fins 11 are substantially the same height as the most projecting portions of the bottom wall 7, and the heat radiation fins 11 and 11 on both outer sides. Is integrally connected to one side wall 8, 9, and both end surfaces of the radiating fin 11 are connected to the other side wall 5, 6 in a planar manner, and the case 4 has a substantially outline outer shape as a whole. It is characterized by being formed in a rectangular shape.

  The capacitor with a case of claim 3 is characterized in that the heat radiation fins 11 are integrally formed on the case bottom wall 7 and the case side walls 5 and 6.

  The cased capacitor of claim 4 is characterized in that the case 4 is made of an insulating resin.

  According to the cased capacitor of the first aspect, since the heat radiation fin is formed, a good heat radiation effect can be obtained. In addition, since the radiating fin is integrally formed with the case, it can be easily manufactured and the cost can be reduced.

  According to the capacitor with a case of claim 2, while increasing the surface area of the case to improve the heat dissipation effect, the case dimensions (vertical width, horizontal width, height) can be the same as the conventional one, Large size can be suppressed.

  According to the capacitor with a case of claim 3, since the heat radiation fin is provided also on the case side wall, the heat radiation effect is further improved.

  According to the cased capacitor of claim 4, it can be easily manufactured and the cost can be reduced.

  Next, specific embodiments of the cased capacitor of the present invention will be described in detail with reference to the drawings. 1A and 1B are perspective views of a cased capacitor. 1A shows the state of use, and FIG. 1B shows the state before resin filling. This cased capacitor is obtained by housing a capacitor element 3 in which lead terminals 2 and 2 are connected to both end faces 1 and 1 as end electrodes in a case 4 and filling resin. The capacitor element 3 is configured by winding a metallized film around the outer periphery of the winding core, and the end electrodes 1 and 1 are formed by thermal spraying a metallicon metal on both end faces of the wound body.

  As shown in FIG. 1, the case 4 includes a front side wall 5, a rear side wall 6, an arcuate bottom wall 7 that continuously connects the front side wall 5 and the rear side wall 6, a right side wall 8, and a left side wall. 9 and has an opening 10. The bottom wall 7 has an arc shape so as to follow the outer shape of the capacitor element 3 to be accommodated. That is, the curvature radius of the bottom wall 7 is set to be substantially the same as the curvature radius of the outer shape of the capacitor element 3 or slightly larger than the curvature radius of the outer shape of the capacitor element 3. A plurality of radiating fins 11.. 11 are integrally formed on the case bottom wall 7 facing the opening 10 of the case 4. In this case, as shown in FIG. 1 (a), the radiation fins 11,... 11 have substantially the same height as the most protruding portion of the arc-shaped bottom wall 7, and the overall outline shape of the case 4 is substantially the same. It is formed so as to be substantially rectangular. That is, the left and right side walls 8 and 9 are integrally connected to the left and right outer radiating fins 11 and 11 so as to have a quadrangular side view. And the front side wall 5 and the rear side wall 6 in a plane. That is, the case 4 is shaped like a rectangular shape having a plurality of grooves so as to leave the arc-shaped bottom wall 7. The case 4 is integrally formed of an insulating resin such as PBT (polypropylene terephthalate), PET (polyethylene terephthalate), or PC (polycarbonate). Each lead terminal 2 protrudes outward from the opening 10.

  By using such a case 4, it is possible to easily manufacture a case-filled capacitor that can radiate heat well and to reduce the cost. In FIG. 1, the surface area of the case 4 is increased to increase the heat dissipation effect, but the case dimensions (vertical width, horizontal width, height) can be the same as the conventional one in FIG. 3.

  FIG. 2 shows a second embodiment. In this case, not only the case bottom wall 7 but also the front side wall 5 and the rear side wall 6 of the case are formed with radiating fins 11.. 11, and the case opening 10 is the same as that shown in FIG. Although the outer shape of 4 is large, the heat dissipation effect is more excellent.

  Although the specific embodiment of the cased capacitor of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. It is. For example, the case 4 including the heat radiating fins 11 may be made of metal such as aluminum, ceramic, or the like other than resin. The capacitor element 3 may be a capacitor other than a film capacitor. The terminal connected to the capacitor element 3 may be an annealed copper wire, a stranded wire, a plate-like terminal, or the like. Furthermore, the bottom wall 7 of the case 4 is not limited to an arc shape, and may be formed in a planar shape.

It is a perspective view of 1st Embodiment of the capacitor | condenser with a case of this invention, (a) is a use condition, (b) has shown the state before resin filling. It is a perspective view of 2nd Embodiment of the capacitor | condenser with a case of this invention. It is a perspective view of the conventional capacitor | condenser with a case.

Explanation of symbols

  3 .. Capacitor element 4.. Case 5.. Front side wall 6.. Back wall 7.. Bottom wall 8 Right side wall 9 Left side wall 10 Opening 11 Heat dissipation fin

Claims (4)

  In the case-filled capacitor in which the capacitor element (3) is stored in the case (4) from the opening (10) and filled with resin, the case wall (7) facing the opening (10) of the case (4) is provided. A cased capacitor characterized by integrally forming the fin (11).   The case bottom wall (7) is formed in an arc shape, the radiation fin (11) is substantially the same height as the most protruding portion of the bottom wall 7, and the outer radiation fins (11) (11) are on one side. The both side walls (8) and (9) are integrally connected to each other, and both end surfaces of the radiating fin (11) are connected to the other side walls (5) and (6) in a plane, and the case (4) is 2. The case-filled capacitor according to claim 1, wherein the overall outline shape is generally rectangular.   2. The case-containing capacitor according to claim 1, wherein the heat radiation fins (11) are integrally formed on the case bottom wall (7) and the case side walls (5) (6).   The case-containing capacitor according to any one of claims 1 to 3, wherein the case (4) is made of an insulating resin.