Importance

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Abstract

A rotary positive displacement blower for producing a flow of fluid. The blower includes a housing having a rotor chamber, an inlet port and an outlet port. The outlet port has a first end and a second end and a first edge and a second edge which extend from the first end towards the second end while becoming increasingly spaced apart from one another. A first rotor and a second rotor are located in the rotor chamber. Each rotor includes a plurality of lobes and are each rotatable about a respective axis. Each rotor includes a plurality of pockets adapted to rotate into fluid communication with the inlet port to receive fluid and to rotate into fluid communication with the outlet port to deliver fluid as the rotors rotate. Fluid passages located in the housing extend between the outlet port and the rotor chamber to provide a flow of high pressure fluid from the outlet port to the pockets of the rotors to pre-pressurize the fluid contained therein before each pocket rotates into fluid communication with the outlet port thereby reducing pressure pulsations and resulting noise and vibration.

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First Claim