| 摘要 |
A vacuum interrupter (10) has a metallic member (11, 13) for a vacuum envelope and an insulating member (12a, 12b) for the vacuum envelope, made of unglazed insulating ceramics. A pair of separable stationary and movable contacts (24, 29) contained in the vacuum envelope. A movable lead rod (16) is rigidly secured to a movable disc-shaped electrode (30) which has the movable contact (29), extending outwardly of the vacuum envelope. Bellows secured in a vacuum-tight manner to the rod (16) and to the vacuum envelope. An impervious insulating film is coated adhesively on atmospheric-side surfaces of the insulating member (12a, 12b) and of the vacuum-tightly connected portion and vicinity thereof between the insulating member (12a, 12b) and metallic member (11, 13) for the vacuum envelope. Consequently, the vacuum envelope of the interrupter (10) is free from adsorbing moisture and pollutant, thereby preventing insulating performance of the envelope from lowering, and highly improving reliablity of vacuum-tightness of the envelope. |
