Title:
SCREW ROTOR AND SCREW TYPE FLUID MACHINE
Document Type and Number:
WIPO Patent Application WO/2005/113984
Kind Code:
A1
Abstract:
A screw type fluid machine so designed that the leakage from the screw type fluid machine is always constant during operation, that is, the gap in an exhaust chamber is always kept substantially constant. Thus, in a screw type fluid machine, the axis-orthogonal sectional shape (805) of the tooth form of a screw rotor is formed by curved lines including an arc (1) constituting the tooth bottom, an arc (3) constituting the outer periphery, and two curved lines that connect the outer periphery with the tooth bottom, wherein one (5) of the two curved lines is a trochoidal curved line generated by points on the outer periphery of a mating screw rotor, while the other of the two curved lines is bisected by the pitch circle into two portions, one from the pitch circle to the outer periphery, and the other from the pitch circle to the tooth bottom; the portion from the pitch circle to the tooth bottom (7) is formed by a predetermined curved line, while the portion from the pitch circle to the outer periphery (9) is formed by the curved line, generated by the bisected predetermined curved line, of the mating screw rotor to complete a tooth form shape.
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Inventors:
NACHI TSUYOSHI (JP)
Application Number:
PCT/JP2005/009415
Publication Date:
December 01, 2005
Filing Date:
May 24, 2005
Export Citation:
Assignee:
NABTESCO CORP (JP)
NACHI TSUYOSHI (JP)
NACHI TSUYOSHI (JP)
International Classes:
F01C1/08; F04C18/16; F04C25/02; (IPC1-7): F04C18/16; F04C25/02
Domestic Patent References:
| WO2004031585A1 | 2004-04-15 |
Foreign References:
| JP2001263276A | 2001-09-26 | |||
| JPH08277790A | 1996-10-22 | |||
| JPH08189485A | 1996-07-23 | |||
| JPS5746083A | 1982-03-16 |
Attorney, Agent or Firm:
NABTESCO CORPORATION (9-18 Kaigan 1-chome, Minato-k, Tokyo 22, JP)
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