Roots blower having zigzag meandering grooves in the casing inner wall surface
First Claim
1. A Roots blower comprising:
- a casing having an inlet port and an outlet port;
a pair of multi-lobed rotors mounted for rotation in the casing, the rotors being rotated in such a manner that communication between the inlet and outlet ports is cut off, thereby drawing in air through the inlet port, the drawn air being discharged through the outlet port without being compressed; and
two sets of zigzag meandering grooves formed on an inner peripheral wall surface of the casing, each set including 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 thereon 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.
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Accused Products
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.
25 Citations
3 Claims
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1. A Roots blower comprising:
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a casing having an inlet port and an outlet port; a pair of multi-lobed rotors mounted for rotation in the casing, the rotors being rotated in such a manner that communication between the inlet and outlet ports is cut off, thereby drawing in air through the inlet port, the drawn air being discharged through the outlet port without being compressed; and two sets of zigzag meandering grooves formed on an inner peripheral wall surface of the casing, each set including 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 thereon 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. - View Dependent Claims (2, 3)
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Specification