초록 ▼

A screw pump, includes a pump case having a fluid inlet, a pumping chamber, and a fluid discharge with at least two intermeshed parallel screw members rotatably mounted therein and in fluid communication with the fluid inlet and the fluid discharge. One synchronous electric drive motor mounted to ea

A screw pump, includes a pump case having a fluid inlet, a pumping chamber, and a fluid discharge with at least two intermeshed parallel screw members rotatably mounted therein and in fluid communication with the fluid inlet and the fluid discharge. One synchronous electric drive motor mounted to each screw member provides the driving power to the screws. Electronic controls are provided for sensing the rotary positions of the motors for synchronizing rotation of the screw members. The pump is also capable of pumping multi-phase fluids.

대표청구항 ▼

[ Having described the invention, I claim:] [1.]1. A screw pump, comprising:a pump case having a fluid inlet, a pumping chamber, and a fluid discharge;at least two oppositely-handed intermeshed parallel screw members rotatably mounted within said pumping chamber and in fluid communication with said

[ Having described the invention, I claim:] [1.]1. A screw pump, comprising:a pump case having a fluid inlet, a pumping chamber, and a fluid discharge;at least two oppositely-handed intermeshed parallel screw members rotatably mounted within said pumping chamber and in fluid communication with said fluid inlet and said fluid discharge;one synchronous electric drive permanent magnet brushless direct-current type motor mounted to each said screw member; andelectronic control means incorporated into a polyphase inverter for sensing rotary positions of said permanent magnet brushless direct-current motors to synchronize rotation of said screw members without the use of timing gears.