Screw machine

US6893240B2 · kind B2 · utility

Assignee

• CARRIER CORPORATION · US

Inventors

• James W. Bush · Sidney, US
• Clark V. Cooper · Glastonbury, US
• Ronald T. Drost · Colchester, US
• Hong Du · Wethersfield, US
• Harry E. Eaton · Woodstock, US
• Hussein E. Khalifa · Manlius, US
• Keshava B. Kumar · Windsor, US
• Reng Rong Lin · Manlius, US
• Philip H. McCluskey · Dunlap, US
• Raymond L. DeBlois · Tolland, US

Key dates

• Filing date: Dec 2, 2002
• Grant date: May 17, 2005
• Expiry date: Dec 2, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05C2251/10
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A screw machine (10) has a rotor housing (12) defining overlapping bores (12-1, 12-2). Female rotor (14) is located in bore (12-1) and male rotor (16) is located in bore (12-2). A wear resistant coating is deposited on the tips (14-1, 16-1) of the rotors. A conformable coating is deposited on the valleys (14-2, 16-2) of the rotors. A conformable coating is depsoited on the surface of the bores coacting with the rotors.