Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1999-07-20
2001-06-19
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Electric or magnetic motor
C417S410300
Reexamination Certificate
active
06247906
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to lowering the high cost of manufacture, and reducing the size and weight of rotary positive displacement electric motor driven gas, vapor and liquid pumps used to provide pressure or vacuum.
Over the years various rotary electric motor driven, gas, vapor and liquid pumping devices have been developed to supply pressure or vacuum for various applications with varying degrees of success. Many devices typically use a separate electric motor to drive a separate pump. Other prior devices use a combined motor and rotary screw pump design.
Prior pumping devices have high manufacturing costs, high part count, low manufacturing efficiency, are noisy in operation, employ bulky and inefficient mufflers, and occupy a lot of space with more weight.
SUMMARY OF THE INVENTION
An improved electric pump is provided for use in various pressure and/or vacuum applications. Advantageously, the efficient pump has low electrical consumption, simplified control, operating and wiring requirements, reduced design restrictions, long service life, low mechanical part count, increased performance and manufacturing efficiency, and significantly reduced manufacturing costs. Desirably, the dependable pump is easy to use, cooler in operation, is multi and/or variable speed, has lower starting amp draw and lower amp draw while running than conventional pumps while achieving high electrical and magnetic efficiency, increased performance, quiet operation, and occupying less space with less weight.
A preferred embodiment of the pump uses a compact one piece pump/motor stator, an efficient, effective and low reluctance magnetic flux path, nonmagnetic endplates, a combined gear pump/motor design or a combined rotary vane pump/motor design both with simplified control requirements, active electronic noise reduction and/or cancellation, and a friction and wear reducing coating applied to parts subject to friction and wear. This provides for excellent efficiency of manufacture, low manufacturing cost, low mechanical part count, high reliability, long life, increased pressure output, quiet operation and a pump which is also very compact.
The novel electric pump has: a rotor or rotors which function and operate as the electric switched reluctance motor rotor or rotors and also as the rotary vane pump rotor or gear pump rotors; a compact one piece stator which functions and operates as the electric switched reluctance motor stator and also as the rotary vane pump stator or gear pump stator, an efficient and effective magnetic flux path; compact, nonmagnetic and lightweight endplates which function as the motor endplates and also as the pump endplates; a friction and wear reducing coating applied to parts subject to friction and wear; audio transducers which are utilized for active noise control; and an electronic computer controller to operate, control and regulate the pump/motor and also to control, operate, and regulate the audio transducers to provide active noise reduction and/or cancellation.
REFERENCES:
patent: 4412794 (1983-11-01), Presley
patent: 4677359 (1987-06-01), Enami et al.
patent: 5370508 (1994-12-01), Barthod et al.
patent: 5421706 (1995-06-01), Martin, Sr.
patent: 5649811 (1997-07-01), Krol, Jr. et al.
Niro, Scavone, Haller & Niro Chicago, IL
Van Quang
Walberg Teresa
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