| 摘要 |
PROBLEM TO BE SOLVED: To suppress the leakage of fluid between pressure chambers without significantly improving the processing accuracy of Roots fluid machinery. SOLUTION: Rotors 21 and 22 of a Roots blower 1 have a section profile composed of a plurality of heights 51 swelling outside the radial direction and a trough 52 installed between the adjoining heights 51. The heights 51 are composed of arcuate both sides and a middle part located between both the sides. The middle part is formed in an arcuate shape in which an inner surface and a curvature of a casing 10 are almost identical. The trough 52 is composed of the middle part projecting in an arcuate shape, both the sides of an envelope-shape corresponding to the arcuate shape of both the sides of the heights 51, and a consecutive part in a shape of a trochoid curve smoothly connecting the middle part and both the sides. COPYRIGHT: (C)2005,JPO&NCIPI
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