Movable end small nozzle connecting structure and arc extinguish chamber

The invention relates to a movable end small nozzle connecting structure and an arc extinguish chamber. According to the movable end small nozzle connecting structure, the mounting base body and the small nozzle are provided with the mutually-matched insertion matching faces respectively, the clamping groove is formed in one insertion matching face, the clamping teeth are arranged on the other insertion matching face, the small nozzle is forcibly mounted on the mounting base body in an inserted mode, the clamping teeth are clamped into the clamping groove, and the small nozzle and the small nozzle are connected through the clamping teeth. The clamping teeth are inclined anti-disengagement clamping teeth so as to prevent the small nozzle from being disengaged in the inserting direction. According to the brand-new movable end small nozzle connecting structure, the small nozzle is inserted into the mounting base body and clamped through the clamping groove and the clamping teeth in a matched mode, the inclined a