Heat dissipating electrical bushing
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorSetsuyuki Matsuda
Life of this patent
Estimating the term…
Abstract
An improved electrical bushing uses a refrigerant to provide cooling of both the bushing and the electrical apparatus to which the bushing is connected. The refrigerant vaporizes inside the hollow conductor of the bushing at the hot contact end, and flows to a heat dissipating device connected to the terminal end of the conductor. A liquid collecting plate collects the refrigerant which has liquefied in the heat dissipating device, and a slender tube inside the conductor transports the liquid refrigerant back to the contact end without the refrigerant contacting the intermediate portion of the conductor.
Claims6
A bushing for electrical apparatus of the type including an outer housing, an electrode disposed within said outer housing, and an insulating gas disposed within said housing and electrically insulating said electrode from said housing, said bushing comprising:
- a hollow insulating shell secured to said outer housing;
- an insulating gas disposed within said shell and in open communication with the insulating gas in said outer housing;
- a hollow, one-piece electrical conductor disposed within, and spaced-apart from, said shell, said conductor having a contact end extending outwardly from said shell and into said outer housing to physically contact said electrode, said conductor having a terminal end distal from said contact end extending outwardly from said shell and having an electrical terminal extending outwardly therefrom;
- a heat dissipation device connected to said conductor terminal end externally of said shell, and in open communication with the interior of said conductor,
- a compressive refrigerant disposed in the interior of said hollow conductor, said refrigerant effecting cooling of said electrode through the transfer of heat based on a phase change due to the vaporizing of said refrigerant on said contact end and the liquefying of said refrigerant on said heat dissipation device,
- a liquid collecting plate projecting from the inner wall surface of the lower end of said heat dissipation device;
- and
- means for introducing said liquefied refrigerant from said liquid collecting plate to said contact end without contacting the intermediate surface of said conductor.
A bushing for electrical apparatus of the type including an outer housing, an electrode disposed within said outer housing, and an insulating gas disposed within said housing and electrically insulating said electrode from said housing, said bushing comprising:
- a hollow insulating shell secured to said outer housing;
- an insulating gas disposed within said shell and in open communication with the insulating gas in said outer housing;
- a hollow one-piece electrical conductor disposed within, and spaced-apart from, said shell, said conductor having a sealed contact end and a terminal end, said contact end extending outwardly from said shell and into said outer housing to physically contact said electrode, said conductor having a partition disposed in the interior thereof at said contact end forming a contact end chamber, said partition having an opening therein, said conductor having a slender tube disposed therein and spaced-apart therefrom sealingly secured to said partition and in fluid communication with said partition opening, said terminal end extending outwardly from said shell distal from said contact end and having an electrical terminal extending outwardly therefrom;
- a heat dissipation device connected to said conductor terminal end externally of said shell;
- a liquid collecting plate projecting from the inner wall surface of the lower end of said heat dissipation device and hermetically sealing said heat dissipation device, said liquid collecting plate having an opening therein, said slender tube being sealingly secured to said liquid collecting plate about said plate opening such that said slender tube is in fluid communication with said heat dissipation device;
- and
- a compressive refrigerant charged in the interior of said heat dissipation device and in fluid communication with said contact end chamber through said slender tube, said refrigerant effecting cooling through the transfer of heat based on a phase change due to the vaporizing of said refrigerant in said contact end chamber and the liquefying of said refrigerant on said heat dissipation device, said refrigerant contacting said conductor only in said contact end chamber.
A bushing for electrical apparatus of the type including an outer housing, an electrode disposed within said outer housing, and an insulating gas disposed within said housing and electrically insulating said electrode from said housing, said bushing comprising:
- a hollow insulating shell secured to said outer housing;
- an insulating gas disposed within said shell and in open communication with the insulating gas in said outer housing;
- a hollow one-piece electrical conductor disposed within, and spaced-apart from, said shell, said conductor having a contact end and a terminal end, said contact end extending outwardly from said shell and into said outer housing, said conductor having a slender tube disposed therein and spaced-apart therefrom, said terminal end extending outwardly from said shell distal from said contact end and having an electrical terminal extending outwardly therefrom;
- an electrical connector disposed within said outer housing and electrically connecting said electrode and said conductor;
- a sealed vaporizing chamber physically contacting said electrode and having an opening therein, said slender tube extending outwardly from said conductor and being sealingly secured to said vaporizing chamber and in fluid communication with said vaporizing chamber opening;
- a heat dissipation device connected to said conductor terminal end externally of said shell;
- a liquid collecting plate projecting from the inner wall surface of the lower end of said heat dissipation device and hermetically sealing said heat dissipation device, said liquid collecting plate having an opening therein, said slender tube being sealingly secured to said liquid collecting plate about said plate opening such that said slender tube is in fluid communication with said heat dissipation device;
- and
- a compressive refrigerant charged in the interior of said heat dissipation device and in fluid communication with said vaporizing chamber through said slender tube, said refrigerant effecting cooling through the transfer of heat based on a phase change due to the vaporizing of said refrigerant in said vaporizing chamber and the liquefying of said refrigerant on said heat dissipation device, said refrigerant being spaced-apart from said conductor along the entire length thereof.
Dependencies are inferred from the claim text.