| 摘要 |
<p>A modified pump body. The pump body comprises a piston seat (1), the piston seat (1) being provided with an accommodation cavity (10) with a piston (3) and an inlet opening (11) located at a side of the accommodation cavity (10); the piston (3), removably installed inside the accommodation cavity (10), an end surface (321) at a tail end of the piston (3) and a silicon seal (5) arranged on the piston (3) abutting internal wall of the accommodation cavity (10) to form a double sealing surface; a rear seat (2) of the piston, fixed on the bottom of the piston seat (1), the rear seat (2) of the piston being provided with a first cavity (201) and a second cavity (202) respectively in communication with the accommodation cavity (10), the second cavity (202) being in communication with the inlet opening (11) through an elbow (21), an outlet pipe (22) in communication with the first cavity (201) being molded on the rear seat (2) of the piston, and automatic valves (4) being respectively installed inside the first cavity (201) and the second cavity (202), so as to enable the first cavity (201) and the inlet opening (11) to be automatically in communication with or isolated from the accommodation cavity (10). The pump body has a tight structure, good gas tightness and usage, and a long life span.</p> |
