| 摘要 |
<p>A piston moving mechanism forces a piston (33) to perform a reciprocating motion along a housing chamber. The piston moving mechanism includes a motor (21), a gear (22) and a weight (23) which are correspondingly attached to a base (1) through a pivot shaft (24) to rotatably engage with a ring (35) at the end of the rod (334) of a piston. A pressure gauge (4) is coupled to the pipe (322) to measure the air pressure in a housing (31). The piston is slidably received in the chamber of the housing to allow the flow of air into the housing through a piston aperture (337). One end of a spring blade (39) is attached to the piston, while the other end resiliently blocks the piston aperture. A sealing ring (333) is received in the annular groove (332) of the piston to provide an airtight seal between the piston and the housing.</p> |
