Dual pitch multiphase screw pump

Details Dual pitch multiphase screw pump Dual pitch multiphase screw pump

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 3/00 (2006.01) F04C 2/16 (2006.01) F04C 13/00 (2006.01)

Patent

CA 2174032

A pump for pumping fluids consisting of liquids with a variable volume of entrained air or gas includes a housing having a fluid inlet, a fluid discharge, a walled fluid passage between the fluid inlet and the fluid outlet, and at least one bleed port through the wall at an intermediate point in the fluid passage. At least two parallel interacting helical screw rotors are rotatably mounted within the fluid passage and extend from the fluid inlet to the fluid discharge, the rotors having pumping capabilities at a high first flow rate between the fluid inlet and the intermediate point and at a second low flow rate between the intermediate point and a point nearer the fluid discharge than the intermediate point. Provisions are made for rotatably driving the rotors. In operation, this pump consumes less power than standard single pitch pumps, and it pumps effectively with void volumes between 0% and 100% allowing use of smaller pumps than normally required.

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