Low volume variable rpm submersible well pump

Details Low volume variable rpm submersible well pump Low volume variable rpm submersible well pump

1986-01-24

1987-07-07

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 53, 417424, 415501, F04B 4906

Patent

active

046784047

ABSTRACT:
A low volume submersible pump assembly has features to stabilize the operation. The pump assembly includes a centrifugal pump driven by a submerged electrical motor. The centrifugal pump has an impeller configuration that is designed for high specific head, but potentially unstable operation. At the design speed, the pump potentially could deliver an indeterminate flow rate for a given head. Also, at the design speed, the design flow rate will yield a design head that is very close to the maximum head at zero flow. The pump has the characteristic of requiring a significant increase in torque to produce higher flow rates. To stabilize the potentially unstable pump, a variable speed drive varies the speed of the motor to maintain constant torque. Maintaining a constant torque allows a considerable variance in head with only a small variance in flow rate resulting.

REFERENCES:
patent: 3551072 (1970-12-01), Zimmerly
patent: 3563672 (1971-02-01), Bergstrom
patent: 3568771 (1971-03-01), Vincent et al.
patent: 3751192 (1973-08-01), Boyd
patent: 3779457 (1973-12-01), Cornyn, Jr. et al.
patent: 3985467 (1976-10-01), Lefferson
patent: 4177649 (1979-12-01), Venema
patent: 4284943 (1981-08-01), Rowe
patent: 4309871 (1982-01-01), Venema
patent: 4370098 (1983-01-01), McClain et al.
patent: 4511312 (1985-04-01), Hartwig
The Berkeley Pump Company Brochure, "Submersible Pumps," Bulletin 1205, 1956.

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