Exhaust device of self-priming pump

The utility model relates to an exhaust device of a self-priming pump, which comprises a plurality of pump shells of the self-priming pump, the pump shell of each self-priming pump further comprises a water inlet pipe and a sealing structure, the upper end of the pump shell is provided with a water inlet, and the water inlet pipe is in threaded connection with the water inlet; the other end of each water inlet pipe is communicated through a water inlet header pipe; the sealing structure comprises a threaded sleeve and a pressing sleeve, the threaded sleeve is arranged above the pump shell and is in threaded connection with the water inlet pipe, a circular groove is formed in the lower end of the threaded sleeve, and a circular fixing groove is formed in the circular groove; two fixing blocks are connected in the circular fixing groove in a sliding mode, connecting blocks are fixedly arranged on the two fixing blocks respectively, the pressing sleeve is fixedly connected with the connecting blocks, the water i