# US 6,398,532 B1 · Single screw compressor

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- Number: US 6,398,532 B1
- Document ID: US6398532B1
- Status: Granted
- Kind: B1
- Application number: 09/696,917
- Filed: 2000-10-26
- Granted: 2002-06-04
- Earliest claimed: 1999-10-26
- Assignees: Shiliang Zha
- Inventors: Shiliang Zha; Qian Zha
- Web page: https://patentgrep.com/patent/US6398532B1

## CPC

- F04C 18/56: of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C 18/084: {Toothed wheels}
- F04C 18/52: of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- Y10T 74/19953: Worm and helical
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention relates to a single screw compressor comprising a body housing a spindle, a screw and two pinions for engaging the screw, wherein both said pinions and said screw have unequal-width teeth, the diameter along said screw in an outer profile is varied, and the range of the closing angle formed when one of said pinion teeth engages,, with and is in close contact with one of the grooves of said screw is from 60° to 66°. The compressor according to the present invention has advantages such as high gas discharge volume, high Energy Efficiency Ratio, smallbulk, high rigidity with the pinion stand and durability.

## Claims

### Claim 1

A single screw compressor comprising two pinions with teeth wherein the teeth of said pinions are modified to be unequal in width, with each pinion teeth being separable into two parts, a left part and a right part, by an imaginary dividing line parallel to the right of the line generated through the center of rotation of each pinion, the width of the left part being larger than that of the right part.