Screw-type vacuum pump having overpressure openings
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United States of America Patent
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Dec 10, 2013
Grant Date -
Feb 16, 2012
app pub date -
Apr 13, 2010
filing date -
Apr 17, 2009
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Abstract
A screw vacuum pump, in particular for compression against atmospheric pressure, comprises a pump housing defining a suction chamber. Two meshing screw rotors are arranged in the suction chamber. Further, an overpressure outlet provided, which comprises an overpressure opening in a side wall of the suction chamber. Further, an overpressure valve is arranged in the overpressure outlet. The width (b) of the overpressure opening in the longitudinal direction of the screw rotors is smaller than or equal to a tooth width (B) of the screw rotors.
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