Movable arm rubber diaphragm

The utility model discloses a movable arm rubber diaphragm, including: bottom plate, locating piece and main part, the surface of bottom plate is equidistantly provided with locating piece, the bottom end of locating piece is fixedly equipped with main part, the main part is equipped with shell, cavity, cooperation end and movable groove, the bottom end of locating piece is fixedly equipped with shell, the inside of shell is equipped with cavity, and the cavity is equipped with the cooperation end and movable groove. A matching end is arranged at the position, located at the bottom end of the cavity, in the shell, a movable groove is formed in the position, located on the side face of the matching end, in the shell, and compared with a traditional rubber diaphragm, when the equipment is used, the change of the inner volume of the containing cavity can be automatically achieved in the moving process of an entity, so that flow and pressure are formed; compared with the prior art, a movable arm structure is addi