Tempering method for a screw-type vacuum pump
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United States of America Patent
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Jun 19, 2007
Grant Date -
Jan 27, 2005
app pub date -
Oct 30, 2002
filing date -
Nov 15, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A screw-type vacuum pump (1) is tempered such that characteristics of the pump are not substantially altered when the pump is subjected to thermal stress. In order to achieve said aim, cooling is adjusted according to an operating state of the screw-type vacuum pump (1), preferably to maintain a substantially constant pump gap (4).
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