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US 10,844,855 B2Granted
Austempered grey iron scroll and method of making thereof
AssigneeTrane International Inc.
InventorGeorge Hansen
Life of this patent
Estimating the term…
Abstract
A scroll compressor includes scroll members that are made of austempered grey iron in whole or in part. The austempering process can increases fatigue strength and toughness of a grey iron while maintaining its good machinability and vibration damping characteristics. Use of austempered grey iron scroll members allows the scroll compressor to improve its capacity, efficiency, and durability.
Claims16
A scroll compressor, comprising:
- a fixed austempered grey iron scroll member;
- an orbiting austempered grey iron scroll member;
- a motor connecting and driving a drive shaft;
- a crank pin connecting the drive shaft to the orbiting austempered grey iron scroll member through a bearing;
- a discharge port in fluid communication with the fixed austempered grey iron scroll member;
- and
- a shell hermetically sealing the scroll compressor,
- wherein each of the fixed austempered grey iron scroll member and the orbiting austempered grey iron scroll member includes an austempered grey iron wrap,
- the orbiting austempered grey iron scroll member is constrained to orbit relative to a fixed austempered grey iron scroll member,
- rotation of the drive shaft and the crank pin draws the orbiting austempered grey iron scroll member around in an orbital path,
- the austempered grey iron wrap is made from a low carbon grey iron, and
- the low carbon grey iron has 3.25 wt. % maximum of carbon content, no more than 0.7 wt. % of copper content, no more than 0.20 wt. % of chromium content, no more than 0.05 wt. % of molybdenum content, no more than 0.05 wt. % of tin content, and no more than 0.015 wt. % of antimony.
9 more elements
A method for preparing an austempered grey iron scroll member, comprising:
- austenitizing a grey iron scroll at a temperature of about 600° C.-about 1000° C. to obtain an austenitized grey iron scroll;
- and
- austempering the austenitized grey iron scroll at a temperature of about 250° C.-about 471° C. for about 30 minutes-about 4 hours,
- wherein the grey iron scroll includes a grey iron wrap,
- the grey iron wrap is made from a low carbon grey iron, and
- the low carbon grey iron has 3.25 wt. % maximum of carbon content, no more than 0.7 wt. % of copper content, no more than 0.20 wt. % of chromium content, no more than 0.05 wt. % of molybdenum content, no more than 0.05 wt. % of tin content, and no more than 0.015 wt. % of antimony.
3 more elements
A method for preparing an austempered grey iron scroll member, comprising:
- austenitizing a grey iron at a temperature of about 600° C.-about 1000° C. to obtain an austenitized grey iron;
- austempering the austenitized grey iron at a temperature of about 250° C.-about 471° C. for about 30 minutes-about 4 hours to obtain an austempered grey iron;
- and
- making an austempered grey iron scroll member from the austempered grey iron,
- wherein the grey iron is a low carbon grey iron that contains 3.25 wt. % maximum of carbon content, no more than 0.7 wt. % of copper content, no more than 0.20 wt. % of chromium content, no more than 0.05 wt. % of molybdenum content, no more than 0.05 wt. % of tin content, and no more than 0.015 wt. % of antimony.
2 more elements
Dependencies are inferred from the claim text.