Worm-type rotary fluid compressor
AssigneeIwata Air Compressor Manufacturing Company Ltd.
InventorYoshio Matsushita
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Abstract
This invention relates to worm-type rotary fluid means, wherein a worm body having a plurality of helical screw threads and a plurality of grooves therebetween is engaged with a cylindrical pinion having a plurality of teeth. In this engagement, the fluid discharge volume is increased much greater than that of a conventional worm. This is due to the fact that the engagement of each pinion tooth of each worm groove has increased contact length and depth. Further, this causes a very stable engagement.
Claims4
A rotary fluid compressor of the type having a worm sealingly interengaging pinion teeth of at least one pinion, comprising:
- said worm including a plurality of spiral teeth, said spiral teeth having an outer profile;
- adjacent pairs of said spiral teeth defining a groove therebetween, said groove having a bottom groove line;
- a cross section of said bottom groove line having a uniform taper from a fluid suction end to a fluid discharge end of said worm;
- a cross section of said spiral teeth including a first tapered portion beginning at said suction end and a second tapered portion contiguous to said first tapered portion and ending at said discharge end;
- said first tapered portion having an outer profile substantially parallel to said uniform taper whereby a portion of said spiral teeth bounded by said bottom groove line and said first tapered portion have a uniform height;
- said second tapered portion being more sharply tapered than said uniform taper whereby a height of said teeth decreases toward said discharge end;
- and
- a casing generally conforming to said first and second tapered portions for sealing said fluid in at least a portion of said grooves.
Dependencies are inferred from the claim text.