Patent ID: 8664550

Claim:
A multi-pole circuit breaker with auxiliary supports, comprising a base, N single-pole circuit breaking units ( 1 ), an operating mechanism ( 102 ) controlling the single-pole circuit breaking units to perform breaking operations, and a rotation axis assembly ( 100 ) for all the single-pole circuit breaking units, the single-pole circuit breaking unit ( 1 ) comprising a housing, an extinguishing chamber ( 2 ), two stationary contacts ( 29 , 33 ) distributed symmetrically, two arc extinguishing grids ( 36 , 37 ) distributed symmetrically, and two terminal strips ( 4 ) connected with the stationary contacts respectively, the rotation axis assembly ( 100 ) consisting of N−1 supporting assemblies ( 101 ) and N support shaft parts ( 12 ) in series, two sides of each supporting assembly ( 101 ) being both provided with a support shaft parts ( 12 ), and each support shaft parts ( 12 ) being provided with a movable contact bridge ( 40 ), the operating mechanism ( 102 ) being directly connected with the rotation axis assembly ( 100 ) in order to directly drive N movable contacts ( 40 ) on the support shaft parts ( 12 ) and the stationary contacts ( 29 , 33 ) of the single-pole circuit breaking units ( 1 ) to perform synchronous opening/closing operation, the multi-pole circuit breaker being characterized in that: the supporting assembly ( 101 ) consists of a rotation axis ( 17 ), an auxiliary support ( 15 ), an auxiliary support bearing ( 16 ) and at least one supporting rod ( 25 ); a shaft hole ( 121 ) is arranged on the support shaft parts ( 12 ), the rotation axis ( 17 ) is inserted into the support shaft parts ( 12 ) at two sides of the support assembly ( 101 ) through the shaft holes ( 121 ), and the rotation axis ( 17 ) maintains synchronous revolution with the support shaft parts ( 12 ), a bearing hole ( 153 ) is arranged on the auxiliary support ( 15 ), an outer side ( 162 ) of the bearing ( 16 ) is tightly assembled with the bearing hole ( 153 ) of the auxiliary support ( 15 ), and an inner side ( 161 ) of the bearing ( 16 ) is tightly assembled with the rotation axis ( 17 ), at least one supporting rod installing hole ( 151 ) is arranged on the auxiliary support ( 15 ), the supporting rod ( 25 ) is tightly assembled with the supporting rod installing hole ( 151 ), the supporting rod ( 25 ) is arranged in parallel to the rotation axis ( 17 ), and all the supporting assemblies ( 101 ) share the supporting rod ( 25 ), the operating mechanism ( 102 ) is fixedly connected with a rotation axis assembly ( 100 ) through the supporting rod ( 25 ), the supporting rod ( 25 ) is fixedly installed on a housing ( 24 ) of the single-pole circuit breaking unit and provides stable supporting force for the rotation axis ( 17 ) through the auxiliary supports ( 15 ).