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2. 发明授权

US5750950A Hydraulic drive device for circuit breaker and circuit breaker using the same 失效
标题翻译：液压驱动装置用于断路器和断路器
公开(公告)号：US5750950A
公开(公告)日：1998-05-12
申请号：US713117
申请日：1996-09-16
申请人： Tadahiko Nogami , Goro Daimon , Yasuhide Takeda , Hideo Kawamoto , Kouichi Sadou , Hiroshi Maeda , Hiroyoshi Sadamura
发明人： Tadahiko Nogami , Goro Daimon , Yasuhide Takeda , Hideo Kawamoto , Kouichi Sadou , Hiroshi Maeda , Hiroyoshi Sadamura
IPC分类号： F15B20/00 , H01H3/24 , H01H33/30 , H01H33/34 , H01H33/02 , H01H33/68
CPC分类号： H01H33/34
摘要： Occurrence of erroneous operation in which circuit closing operation unexpectedly happens after circuit opening operation even though an abnormality such that a circuit closing system is left in a circuit closing condition even after completion of the circuit closing operation. Accordingly, a circuit closing control valve has such an arrangement that its pilot chamber becomes a low pressure so that the circuit closing control valve is opened, and a lock valve having two pilot chambers connected to a circuit closing pilot valve and a circuit opening pilot valve, which are both become a low pressure, is located in a passage connecting between the pilot chamber of the circuit opening control valve and a return port. With this arrangement, if the above-mentioned abnormality occurs, the circuit closing condition is maintained unless a circuit opening instruction is delivered, and once the circuit opening operation is effected, the lock valve is opened so as to connect the pilot chamber of the circuit opening control valve to the lower pressure side so that the circuit opening control valve is left to be opened in order to disable the circuit closing operation, thereby it is possible to prevent occurrence of erroneous operation.
摘要翻译：即使在电路闭合操作完成之后电路关闭系统仍处于电路关闭状态的异常，电路关闭操作意外地发生在电路打开操作之后发生错误操作。因此，电路关闭控制阀具有这样一种结构，使其先导室成为低压，使得电路关闭控制阀打开，并且具有连接到电路关闭先导阀和电路打开先导阀的两个先导室的锁定阀两者均成为低压，位于连接在回路打开控制阀的先导室和回流口之间的通道中。通过这种布置，如果发生上述异常，除非发出开路指令，否则保持电路关闭状态，一旦进行开路操作，则锁定阀打开以连接电路的先导室打开控制阀到下压侧，使得断路控制阀被打开以禁止电路关闭操作，从而可以防止错误操作的发生。

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