JPS6228738Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a case-built-in capacitor with improved heat dissipation.

Capacitors with a wound capacitor element built into the case, such as aluminum electrolytic capacitors, have a structure in which the closer you get to the core of the capacitor element, the farther away from the outer wall of the case it becomes, making it difficult for heat to dissipate, and the temperature is highest at the center of the element. It's getting old. As a result, the thermal deterioration of the device is not uniform, resulting in accelerated deterioration of the device as a whole. In order to improve these drawbacks, some aluminum electrolytic capacitors are made by winding aluminum electrolytic foil, which has a lower etching ratio, near the winding core, but this method is less effective. There were flaws.

In view of the above points, the present invention aims to provide a case-built-in capacitor that has high heat dissipation efficiency and can reduce thermal deterioration.

In order to achieve the above object, the present invention has been developed so that one end is inserted into the core of a wound type capacitor element, and the other end is inserted into a case made of metal, resin, etc. A case built-in type, characterized by having a heat pipe drawn out to the outside of the case, and a flat plate attached to the other end of the heat pipe drawn out to the outside of the case, and which can be adhesively fixed to a substrate or fixed with screws. It provides capacitors.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 denotes a capacitor element in which a polarizing foil formed by forming an oxide film on aluminum metal or the like is laminated with a separator and a cathode foil and wound. This wound type capacitor element 1 is housed in a cylindrical case 2. Lead wires 3 and 4 are drawn out from the end face of the wound capacitor element 1, and external lead terminals 6 are provided on a lid 5 that seals the case 2.
and 7, respectively. A heat pipe 8 has one end inserted into the core of the wound capacitor element 1 and the other end drawn out from the bottom of the case 2. The heat pipe 8 is made of a metal such as copper or stainless steel, and is made of metal such as copper or stainless steel, and is filled with an operating liquid such as methanol, acetone, or potassium. Heat pipe 8 case 2
A flat plate 9 having approximately the same diameter as the case 2 is fitted onto the other end of the outside or attached with an adhesive or the like. 10 is an adhesive layer provided on the bottom surface of the flat plate 9.

In other words, when energized, the wound capacitor element 1
When the case 2 generates heat, the heat is radiated from the part near the outer wall of the case 2. The heat generated near the winding core 11 is transferred to one end of the heat pipe 8, and this heat causes the working fluid to boil and generate steam. At this time, the added heat is accumulated in the steam as heat of evaporation, so that the temperature near the winding core 11 decreases. The steam generated in the heat pipe 8 moves to the other end and condenses there. As the steam condenses, the heat of condensation is released and dissipated to the outside of the heat pipe 8. Since the flat plate 9 is attached to the other end where heat is dissipated, the heat dissipation area can be made larger than in the case of only the heat pipe 8, and the heat dissipation efficiency is higher. Furthermore, since the adhesive layer 10 is provided on the flat plate 9, it can also serve as a mounting leg when attached to a substrate such as a chassis. Further, the capacitor element 1 can be fixed without using a filler such as a compound.

As shown in FIG. 2, screw holes 1 are provided in the flat plate 12.
3 may be provided and screwed to the board.

As described above, according to the present invention, heat dissipation efficiency can be improved and evened out, so thermal deterioration etc. can be reduced.
A case built-in capacitor that is easy to install is obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a flat plate used in another embodiment of the present invention. 1... Wound capacitor element, 2... Case,
8... Heat pipe, 9, 12... Flat plate, 10...
...adhesive layer, 11 ... core, 13 ... screw hole.

Claims (1)

[Scope of utility model registration request] A case built-in type capacitor in which a wound type capacitor element is built into the case includes a heat pipe having one end inserted into the winding core and the other end drawn out to the outside of the case, and a substrate attached to the other end of the heat pipe. A case-built-in capacitor characterized by having a flat plate that can be adhesively fixed to or screwed to.