| 摘要 |
A fluid machinery driven equipment such as a rotary pump has a simple structure and high efficiency with a small size and law cost. The driven equipment includes a tubular casing having an inner surface which is substantially elliptical in shape, front and rear covers for covering the tubular casing through fastening means, a rotary shaft provided in the tubular casing and is supported by the front and rear covers, and a rotor provided in the tubular casing and connected to the rotary shaft. The rotor is formed of a first arm, a piston rotatably connected to each end of the first arm through a piston pin where the piston having an outwardly curved surface and each end has an inwardly bent portion, a second arm in perpendicular to the first arm, a rotary plate proved at each end of the second arm and having an outwardly curved surface, and an inner surface at each end of the rotary plate slidably contact an outward surface of the inwardly bent portion of the piston, piston seals elastically formed on the piston for air tightly contacting the inner surface of the tubular casing, and a spring provided between the first arm and the piston for reducing frictional forces between the piston seals and the inner surface of the tubular casing.
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