Screw compressor and method of manufacturing rotor for the same

Rotary expansible chamber devices – With wear surface treatment or integrally plated wear layer

Reexamination Certificate

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Details

C418S179000, C418S201100, C148S230000, C148S232000

Reexamination Certificate

active

06884049

ABSTRACT:
A screw compressor of which a female rotor is driven by a motor, and of which a male rotor is driven by the female rotor. The male or female rotor is composed of a member which is made of cast iron and is subjected to surface hardening treatment or heat treatment including quenching. The surface hardening treatment may include sulphonitriding or nitiriding treatment. In the case of subjecting the cast iron to the heat treatment, austemper treatment is applied.

REFERENCES:
patent: 2538239 (1951-01-01), Farnsworth
patent: 3647577 (1972-03-01), Nobuyasu
patent: 4000011 (1976-12-01), Sato et al.
patent: 4944663 (1990-07-01), Iizuka et al.
patent: 5743321 (1998-04-01), Joern et al.
patent: 02107721 (1990-04-01), None
patent: 02108885 (1990-04-01), None
patent: 03290086 (1991-12-01), None
patent: 04048028 (1992-02-01), None
patent: 09112469 (1997-05-01), None
patent: A-11-62860 (1999-03-01), None

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