Scroll type fluid displacement apparatus with surface treated spiral element
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United States of America Patent
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-
Sep 11, 1990
Grant Date -
N/A
app pub date -
Mar 12, 1984
filing date -
Mar 15, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scroll type fluid displacement apparatus is disclosed in which the scrolls are made of aluminum or an aluminum alloy to reduce the weight of the apparatus. The scrolls are finished by end milling and then electrolytically or chemically polished to reduce the roughness of the mating surfaces. Thereafter, at least one scroll is treated with alumite to reduce wearing due to contact between the scrolls. As a result, sealing of the fluid pockets between the scrolls during extended use of the apparatus can be maintained.
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