| 摘要 |
A rotary pump comprises a body (11), a rotor (12) and at least one cam (13). The rotor (12) rotates along a chamber (111) of the body in a closely contact way. Each cam (13) controls a sealing part in order to form a substantially hermetic space constituted by the sealing part (151), a convex surface (122) of the rotor and an inner surface of the chamber (111). The air in the chamber (111) is led out when is compressed to a set pressure. The rotary pump of the invention not only runs smoothly and is not easy to make noises, but also has larger compression amount and higher compression ratio.
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