Composite dry vacuum pump having roots and screw rotors
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United States of America Patent
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Aug 27, 1996
Grant Date -
N/A
app pub date -
Mar 3, 1995
filing date -
Nov 24, 1994
priority date (Note) -
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Abstract
A composite dry vacuum pump of this invention has closed chambers accommodating a pair of screw rotors and a pair of roots rotors respectively mounted coaxially to the front ends of the screw rotors. The roots rotors and the screw rotors are rotated at the same speed in opposite directions by a motor to aspirate fluids from a suction port on one end wall and discharge the fluid through a discharge port on the outer surface of the other end wall. The characteristics of power requirement of the portion of the roots rotors and that of the portion of the screw rotors changes inversely to the suction port pressure variation, therefore the characteristic of the total power requirement of the pump of this invention is almost flat over the all pressure range and the motor having smaller output power can operate the pump according to the present invention. Furthermore, the pump of this invention having the roots rotors coaxially assembled on the front end of the screw rotors makes a device containing this pump more compact one.
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