Screw pump
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United States of America Patent
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Nov 18, 2008
Grant Date -
Jun 14, 2007
app pub date -
Jan 24, 2007
filing date -
May 8, 2003
priority date (Note) -
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Abstract
A pump including at least three rotors each being provided with a generally helical screw thread, the rotors being mounted for rotation in a housing such that the screw threads of the rotors mesh and rotation of one rotor causes rotation of the other rotor, wherein the pitch of the threads is less than 1.6 times the outer diameter of the rotors or where one of the rotors has a larger outer diameter than the other rotors the outer diameter of the larger diameter rotor.
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