Screw compressor and method of manufacturing rotor for the same
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United States of America Patent
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Apr 26, 2005
Grant Date -
Jun 12, 2003
app pub date -
Nov 20, 2002
filing date -
Dec 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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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.
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