Vacuum pump
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United States of America Patent
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Sep 27, 2016
Grant Date -
Sep 19, 2013
app pub date -
Oct 18, 2011
filing date -
Dec 10, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
In a rotor blade cylindrical portion or a stator portion in which thread grooves are formed, convex surfaces (thread groove peak surfaces) configuring the peak sections of the thread grooves are cut by a desired amount over the entire circumference (a circumferential direction of the thread grooves) of a certain range in an axial direction. As a result, the gap on the lower side of the thread groove portion can partially be expanded by cutting the thread groove peak surfaces by a desired amount.
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