Vacuum circuit breaker arc extinguishing chamber external insulation seal structure

The utility model discloses a vacuum circuit breaker arc extinguishing chamber external insulation seal structure, comprising a sealing plate, a fixing plate, an incoming line plate, a buffering layer, an upper supporting ceramic sleeve, and a lower supporting ceramic sleeve, wherein the top part of an arc extinguish chamber is provided with a flexible coupling; the buffering layer is pressed and connected on the flexible coupling; the middle part of the incoming line plate protrudes and is connected with the buffering layer through bolts; the two ends of the flexible coupling are connected with the side wall of the incoming line plate; an annular outer edge of the incoming line plate fixes the upper supporting ceramic sleeve; a sealing ring is embedded between the incoming line plate and the upper supporting ceramic sleeve; the sealing plate covers the top surface of the incoming line plate; the fixing plate fixes the lower supporting ceramic sleeve; and the lower end of the arc extinguishing chamber is clam