Multi-stage helical screw rotor
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United States of America Patent
Stats
-
Jul 11, 2006
Grant Date -
Apr 25, 2002
app pub date -
Oct 30, 2001
filing date -
Oct 18, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vacuum pump includes an inlet port (14) and an exhaust port (86, 88). Gas from an enclosure connected to the inlet port is pumped to the exhaust port by first and second rotors (18, 52, 254) which are mounted on first and second shafts (30, 60) extending through a pump chamber (112). The rotors are connected with shaft sections (140, 150, 240, 250) which include a lobe (142, 172, 242, 242') extending from the shaft sections and a mating channel (152, 182, 252, 252') defined in the other. The lobes matingly engage the channels during rotation of the rotors to form a suction section (154). The suction section (154) compresses a volume of gas entering the pump from the inlet port (14) reducing the power consumed to move the volume of gas through the pump chamber more easily and increase pump efficiency.
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