公开(公告)号：US4184059A

公开(公告)日：1980-01-15

申请号：US846844

申请日：1977-10-31

申请人： Richard Graham ,  Eugene L. Kamp ,  Armin M. Bruning ,  Earl S. Gritton ,  L. Ronald Azdell

发明人： Richard Graham ,  Eugene L. Kamp ,  Armin M. Bruning ,  Earl S. Gritton ,  L. Ronald Azdell

IPC分类号： H01H33/56 ,  H01H33/66 ,  H01H9/04 ,  H01H21/08

CPC分类号： H01H33/66 ,  H01H33/565

摘要： A high dielectric strength seal between the encapsulant and the outwardly projecting actuating arm of an externally operable encapsulated vacuum switch includes a fluid-receiving sealed cavity surrounding the actuating arm between the latter and the encapsulant. An externally accessible valve permits charging of the cavity with a dielectric fluid subsequent to encapsulation of the switch to insure displacement of air from the interface between the encapsulant and actuating arm, thereby greatly reducing the likelihood of corona formation and dielectric breakdown of the seal. Additionally, the dielectric fluid may be pressurized through the valve to preclude infusion of conductive contaminants into the cavity. In preferred forms, an accumulator is in fluid communication with the cavity to permit thermal expansion and contraction of the dielectric fluid without undesired leakage or cavitation of the liquid.

摘要翻译： 密封剂和外部可操作的密封真空开关的向外突出的致动臂之间的高介电强度密封包括围绕致动臂的流体接收密封空腔和密封剂。 外部可接近的阀允许在开关封装之后用介电流体充电空腔，以确保空气从密封剂和致动臂之间的界面排出，从而大大降低了电晕形成和密封件的介质击穿的可能性。 此外，电介质流体可以通过阀加压，以防止将导电污染物注入空腔。 在优选形式中，蓄能器与空腔流体连通，以允许介电流体的热膨胀和收缩，而不会对液体造成不必要的泄漏或气蚀。