Patent ID: 7811071
Filing Date: 2010-10-12
Classification: F04C,F16C,F25B

Abstract:
1. A scroll machine comprising: a first scroll member having a discharge port and a first spiral wrap; a second scroll member having a second spiral wrap, said first and second spiral wraps being mutually intermeshed; a discharge chamber in fluid communication with said discharge port; a motor for causing said second scroll member to orbit with respect to said first scroll member, whereby said wraps create at least one enclosed space of progressively changing volume between a peripheral suction zone defined by said scroll members and said discharge port, wherein the scroll machine is configured to process a refrigerant comprising carbon dioxide; and an Oldham coupling keyed to said second scroll member and said first scroll member to prevent rotational movement of said second scroll member, said Oldham coupling being formed from a metal material comprising aluminum and having an unsealed porous anodized surface comprising a Type III hardcoat passivation layer, wherein at least a portion of the unsealed porous anodized surface is a contact surface that provides wear resistance in the presence of said refrigerant comprising carbon dioxide for at least 1,000 hours of scroll machine operation.