| 摘要 |
PROBLEM TO BE SOLVED: To provide a Roots suction . compressor without a frictional rotation, with big suction/exhaust amounts and long use life and also not requiring maintenance so much, by which an electric power can be saved. SOLUTION: A hollow gourd-shaped rotor chamber 31 is formed inside a pump main body 30 and an intake passage 34 and exhaust passage 35 are provided on its upper/lower end surfaces respectively and a main drive rotor 41 and a driven rotor 42 are provided in the rotor chamber. At least two blades 411, 421 are molded symmetrically around respective shafts and both rotors are formed in parallel and their one ends are equiped together by a shaft to the pump main body and the main drive rotor is rotated by a motor 60 drivingly and the driven rotor is rotated interlockingly by the meshing of the other end with gears 412, 422 and the blades of both rotors are fitted alternately crossingly each other in the rotor chamber and an extremely small clearance is formed between respective blades and each blade and the inner periphery wall 311 of the rotor chamber and thereby the non-contact rotation can be operated.
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