Patent ID: 8963678
Filing Date: 2015-02-24
Classification: H01H

Abstract:
1. A circuit breaker closing/opening actuating mechanism, comprising: a driving device, and a force transmitting mechanism, wherein said force transmitting mechanism is coupled to a circuit breaker's switch mechanism, wherein said driving device comprises an expansion body and a heater, said expansion body is coupled to said force transmitting mechanism and has an expansive matter inside, said expansion body comprises a metal shell, said expansive matter positioned inside said metal shell, and a converter of volume expansion-displacement expansion, wherein said expansive matter is paraffin, said heater adopts a positive temperature coefficient (PTC) thermistor for preventing overheating or an electric heating element, said force transmitting mechanism comprises an ejector rod, a spring and a soft wire; wherein said metal shell has an ejector rod through hole; said converter of said volume expansion-displacement expansion comprises an ejector rod piston which is movably mounted inside said ejector rod through hole; said ejector rod piston is sealedly connected with said metal shell; a portion of said ejector rod piston positioned inside said inner sealed chamber of said metal shell is connected with said expansive matter directly or indirectly; a mixture of a fluid medium and said expansive matter is positioned inside said inner sealed chamber of said metal shell; said portion of said ejector rod piston positioned inside said inner sealed chamber of said metal shell is positioned in said fluid medium; and a separating membrane is positioned in said inner sealed chamber of said metal shell, and provided between said fluid medium and said expansive matter; wherein said volume expansion of said expansive matter in said expansion body is produced by phase transforming of solid phase-liquid phase or liquid phase-gas phase of said expansive matter; a sealing element is mounted between said converter of said volume expansion-displacement expansion and said metal shell, wherein said sealing element is selected from the group consisting of a sealing O ring, a sealing pad, and an annular sealing sleeve; wherein said separating membrane is metallic or made of high polymer material, for receiving an expansion force produced by said expansive matter to motive said ejector rod piston and said fluid medium is for converting said volume expansion of phase transforming of said expansive matter into the expansion force and displacement transmitted into said ejector rod piston, in such a manner that, when said heater is powered on, said expansive matter expands to produce a volume-displacement change to motivate said force transmitting mechanism, and that said force transmitting mechanism drives the circuit breaker's switch mechanism to open/close a circuit breaker.