Variable frequency drive system for fluid delivery system

Details Variable frequency drive system for fluid delivery system Variable frequency drive system for fluid delivery system

1994-11-16

1996-06-04

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 442, 417 53, F04B 4106

Patent

active

055227074

ABSTRACT:
A fluid flow delivery system switches a variable speed pump drive among a plurality of pumps. The remaining pumps can be operated as constant speed pumps and can be energized one at a time in response to increasing demand. The pump associated with the variable speed drive can be operated over a variable output range to provide relatively low levels of fluid output, in response to low demand, and can be operated in combination with one or more constant speed pumps to provide increased levels of output fluid in response to greater demand levels.

REFERENCES:
patent: 3005411 (1961-10-01), Metz
patent: 3511579 (1970-05-01), Gray et al.
patent: 3844683 (1974-10-01), Albert
patent: 4290735 (1981-09-01), Sulko
patent: 5259731 (1993-11-01), Dhindsa et al.
Brochure entitled "720 Pressure Reducing Valve" dated Jul., 1983.

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