Screw compressor
AssigneeHitachi, Ltd.
InventorsMitsuru Fujiwara, Taisuke Torigoe
Life of this patent
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Abstract
A screw compressor having a recess formed in the high-pressure end surface of the casing. This recess receives the fluid from a closed working space which has just been isolated from the discharge port and closed in the compression step. Consequently, the abnormal pressure rise in the closed working space, which is caused due to the compression of the fluid confined, is completely eliminated. The recess has a configuration involving a curve conforming with the leading flank of the female rotor at the instant at which the working space is isolated from the discharge port and closed.
Claims10
A screw compressor comprising a casing having two intersecting bores with parallel axes, a suction port and a discharge port communicating with said bores, respectively, and a pair of screw rotors, one male and one female, received in said bores so as to rotate in meshing relationship to suck gas from the suction port into a working space defined by said rotors and said casing, to compress the gas and then to discharge the gas through the discharge port;
- wherein the improvement comprises a discharge side end surface of said casing having a recess formed thereon so as to open in the bores, said recess having a configuration, in the plane perpendicular to the axes of said rotors, which includes a curve which conforms with a leading edge of the female rotor facing a closed working spaced formed between said rotors just as the working space is isolated from the discharge port.
Dependencies are inferred from the claim text.