Screw vacuum pump with male and female screw rotors having unequal leads
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United States of America Patent
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Jun 29, 2010
Grant Date -
Sep 28, 2006
app pub date -
Mar 2, 2004
filing date -
Mar 3, 2003
priority date (Note) -
Expired
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Abstract
In a screw vacuum pump 30, equal lead screws each in the range of 1 to 4 leads are added on the discharge side of male and female screw rotors (4) and (5) having a continuously changing screw gear helix angle, at a final lead angle of the male and female unequal lead screw rotors on the discharge side that continuously change in helix angle following the advance of the screw gear helix.
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