Contact device and electromagnetic switch using contact device
View Patent ↗The present invention provides a contact device capable of narrowing a gap between a fixed contactor and a movable contactor and reducing the number of parts and the production costs, and an electromagnetic switch that uses the contact device. The contact device has a pair of columnar fixed contactors ( 6 a, 6 b ) which are fixed to a surface of an insulation airtight container ( 4 ) while keeping a predetermined space therebetween, each having at least a tip end contact surface protruding into the insulation container; a movable contactor ( 11 ) that is disposed so as to be capable of contacting with and separating from the pair of fixed contactors ( 6 a, 6 b ); and a pair of arc extinguishing annular permanent magnets ( 9 a, 9 b ) which is respectively attached to outer circumferential surfaces of the pair of fixed contactors ( 6 a, 6 b ) and drives an arc outwardly.
1. A contact device, comprising:
a pair of columnar fixed contactors fixed to a surface of an insulation container while keeping a predetermined space therebetween, each having at least a tip end contact surface protruding into the insulation container;
a movable contactor disposed so as to be capable of contacting with and separating from the pair of columnar fixed contactors; and
a pair of arc extinguishing annular permanent magnets respectively attached to outer circumferential surfaces of the pair of columnar fixed contactors and driving an arc outwardly.
2. The contact device according to claim 1 , wherein the arc extinguishing annular permanent magnets are magnetized to an N-pole at a side facing the movable contactor.
3. The contact device according to claim 1 , wherein the insulation container has an airtight container and the airtight container encapsulates gas therein.
4. An electromagnetic switch, comprising the contact device according to claim 1 ;
wherein the movable contactor is coupled to a movable core of an electromagnetic device and the fixed contactors are respectively connected to external connection terminals.