| 摘要 |
PROBLEM TO BE SOLVED: To provide a puffer type gas insulation circuit breaker which uses an operation unit of a reduced operation force and can make a whole unit smaller and lighter and can be manufactured economically. SOLUTION: In a container 10 in which an insulation gas is filled, there is arranged a breaker portion 20 provided at least with a fixed and a movable contactors 21, 22, arc contactors 23, 24 on a side of the fixed contactor and the movable contactor, a puffer unit having a puffer cylinder 25 and a piston 26, and an insulation nozzle 27 which puffs an compressed insulation gas to an arc between the arc contactors by the puffer unit when a current is shut down. A flange-shaped pressure receiving portion 27A is integrally formed at a top end portion of the insulation nozzle 27, and the flange-shaped pressure-receiving portion 27A can be moved inside and includes a hollow cylindrical portion 33 arranged concentrically with the contactor 23 of the fixed side. The hollow cylindrical portion 33 has a pressure receiving plate 34 of which the gas discharging port 35 is formed on an opposite side of the insulation nozzle and is used for applying a pressure by holding an insulation gas of a high temperature temporarily between the flange-shaped pressure receiving portion 27A and the pressure receiving plate 34 of the hollow cylindrical portion 33. COPYRIGHT: (C)2009,JPO&INPIT
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