Oil retention in scroll compressor pump members
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United States of America Patent
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Feb 12, 2008
Grant Date -
Nov 23, 2006
app pub date -
May 18, 2005
filing date -
May 18, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Oil retention recesses are formed on either or both orbiting and non-orbiting scroll elements. In one embodiment, the recesses are formed in a tip of a wrap of at least one of the scroll members. In another embodiment the recesses are formed on the base of at least one of the scroll elements. The recesses ensure that a sufficient quantity of oil is captured within the recesses to provide the lubrication into the interfacing surface of these elements. The recesses help, after a compressor is shutdown for long periods, to provide as lack of lubricant between the engaged scroll elements upon compressor start up. Other events may also cause momentary loss of oil supply at the compressor, such as, for example, compressor flooding. The recesses also help during intermittent interruption of oil delivery or when the amount of oil circulation is less than desirable.
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