Rotary expansible chamber devices – Combined
Patent
1997-06-10
1999-08-31
Vrablik, John J.
Rotary expansible chamber devices
Combined
4182061, F04C 1818, F04C 2906
Patent
active
059445017
ABSTRACT:
A Roots blower includes a casing having an inlet port and an outlet port, and a pair of multi-lobed rotors mounted for rotation in the casing. The rotors are rotated in such a manner that communication between the inlet and outlet ports is cut off, so that air is drawn in through the inlet port and the drawn air is discharged through the outlet port without being compressed. Two sets of zigzag meandering grooves are formed on an inner peripheral wall surface of the casing. Each set includes a plurality of zigzag meandering grooves zigzag extending in rotation directions of the rotors over two regions of the inner peripheral wall surface of the casing spreading from locations corresponding to apexes of front lobes of the rotors to the outlet port with respect to the rotation directions of the rotors when communication between the inlet port and chambers defined by the front lobes, rear lobes and the inner peripheral wall surface of the casing is cut off by the rear lobes with respect to the rotation directions of the rotors, respectively.
REFERENCES:
patent: 4781541 (1988-11-01), Sohler et al.
Anlet Co., Ltd.
Vrablik John J.
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