Heat sink for contact stems of a vacuum interrupter and a...

Details Heat sink for contact stems of a vacuum interrupter and a... Heat sink for contact stems of a vacuum interrupter and a...

H - Electricity

01

H

H01H 9/52 (2006.01) H01H 71/00 (2006.01) H01H 1/58 (2006.01) H01H 33/66 (2006.01)

Patent

CA 2217903

Heat sinks are placed on the contact stems of a vacuum interrupter between the vacuum bottle and junctions with the terminal conductors to lower the temperature of these junctions. The heat sinks are formed by a stack of thin laminations having central openings with inwardly directed tabs which bite into and secure the laminations to the stems. The laminations have aligned slots forming axial passages for cooling air. Preferably, the slots are enclosed to eliminate sharp peripheral edges to reduce the potential for flash over. In one embodiment, the slots are not formed by removing material but by bending it out of the plane of the lamination to maximize heat radiating surface area and to generate turbulent cooling air flow for increased cooling efficiency. An axially extending peripheral lip can provide axial spacing between laminations.

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