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公开(公告)号：US20180323028A1
公开(公告)日：2018-11-08
申请号：US15755724
申请日：2017-05-17
发明人： Yanxia ZHANG , Li ZHANG , Zhihao ZHENG , Qianzhong CHEN
摘要： The present invention provides an arc extinguishing structure for direct current circuit breaker, which comprises an arc extinguishing chamber (3) installed on a second casing (2), with a lateral opening (30) which opens towards the first casing (1); a gas generating hood (4) installed at a lower part inside the arc extinguishing chamber (3) and comprising two gas generating plates (41, 42) that are disposed opposite to each other, with a shield plate (43) disposed opposite to the lateral opening (30) and adjacent the second casing (2); a movable contactor (5) and a stationary contactor (6) installed inside an internal installation space (10), with the disconnecting portion between the movable contactor (5) and the stationary contactor (6) being located inside an accommodation space (40) and close to the shield plate (43), so that when the movable contactor (5) becomes disconnected from the stationary contactor (6) and an electric arc is produced, the electric arc triggers the gas generating plates (41, 42) and the shield plate (43) to generate a lot of gas which pushes the electric arc to move in a direction away from the shield plate (43); a plurality of arc extinguishing grid-plates (7) installed at an upper part inside the arc extinguishing chamber (3), having lower slots (71) which are open towards the accommodation space (40) and have a size that gradually decreases along a direction from the second casing (2) to the first casing (1), so that the electric arc during its moving process is continuously blocked by the arc extinguishing grid-plates (7) with increasingly smaller sizes of lower slots (71), and as a result, the electric arc cannot come out from the lateral opening (30) of the arc extinguishing chamber (3), but instead can only enter the spaces between the arc extinguishing grid-plates (7) and thus get extinguished as quickly as possible.
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