Thread groove type vacuum pump
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 24, 1987
Grant Date -
N/A
app pub date -
Aug 14, 1986
filing date -
Aug 14, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hollow cylindrical stator and a cylindrical rotor are disposed in the stator with a gap therebetween, the inner peripheral surface of the stator or the outer peripheral surface of the rotor being provided with a helical groove, or thread groove, and evacuation being performed by rotation of the rotor. The width of the helical groove adjacent the suction side of the pump is larger than the width of a ridge between adjacent turns of the groove.
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