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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 whil

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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A rotary positive displacement blower for producing a flow of fluid, said blower including: a housing having a rotor chamber, an inlet port and an outlet port, said outlet port having a width dimension and a length dimension a first rotor located in said rotor chamber, said first rotor having a plur

A rotary positive displacement blower for producing a flow of fluid, said blower including: a housing having a rotor chamber, an inlet port and an outlet port, said outlet port having a width dimension and a length dimension a first rotor located in said rotor chamber, said first rotor having a plurality of lobes and being rotatable about a first axis in a first direction of rotation,said first rotor forming a plurality of first pockets, each said first rotor, each said first pocket adapted to rotate into fluid communication with said inlet port to receive fluid through said inlet port and to rotate into fluid communication with said outlet port to deliver fluid through said outlet port as said first rotor rotates; and a second rotor located in said rotor chamber, said second rotor having a plurality of lobes and being rotatable about a second axis in a second direction of rotation, which is opposite to said first direction of rotation, said second rotor forming a plurality of second pockets, each said second pocket being located between adjacent lobes of said second rotor, each said second pocket adapted to rotate into fluid communication with said inlet port to receive fluid through said inlet port and to rotate into fluid communication with said outlet port to deliver fluid through said outlet port as said second rotor rotates; said outlet port of said housing having a first end located generally adjacent said first rotor and a second end located generally adjacent said second rotor a first edge extending from adjacent said first end in a first plane which is generally perpendicular to said first and second axes of said rotors second edge extending from adjacent said second end in a second plane which is generally perpendicular to said first and second axes of said rotors and generally parallel to and spaced apart from said first plane a third edge which extends from adjacent said first end to said second edge and a fourth edge which extends from adjacent said second end to said first edge said third and fourth edges each being generally convexly curved. whereby the area of said outlet port which becomes exposed to said pocket of said first rotor increases as said first rotor rotates.