| 摘要 |
A rotary compressor of the type in which a female rotor and a male rotor turn in opposite directions in the compressor casing, the female rotor having at least one pocket therein that receives at least one lobe on the male rotor, the lobe sweeping a cylindrical side wall of the casing to effect compression of a gas. A sealing rib is provided on the female rotor on the trailing side of the pocket, and a recess is provided on the male rotor at the rear of the lobe for receiving this rib. The female rotor has a peripheral surface extending rearwardly from the rib with respect to the direction of rotation of the female rotor, and terminating in the same or a different pocket, this peripheral surface being spaced a substantial distance radially inwardly of the surrounding cylindrical side wall of the casing, the rib sweeping this side wall with close clearance and hence effecting a portion of the compression of the compressor. The male rotor likewise has a peripheral surface spaced radially inwardly from its associated cylindrical side wall of the casing and extending from the recess in the male rotor rearwardly with respect to the direction of rotation of the male rotor to the same or a different lobe. These two peripheral surfaces, when juxtaposed, are spaced with only a small clearance thereby to seal between the rotors. The peripheral extent of these peripheral surfaces is substantially greater than that of their respective rib and recess, that on the female rotor being at least four times the peripheral extent of the rib.
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