Pumps – Condition responsive control of pump drive motor – Plural pumps having separate drive motors – supply sources,...
Patent
1978-04-27
1980-11-11
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Plural pumps having separate drive motors, supply sources,...
417 26, 417 28, 417 34, F04B 4902
Patent
active
042329973
ABSTRACT:
A method and apparatus for controlling a compressor is disclosed wherein both the compressed air output and the speed of the compressor are simultaneously adjusted in relation to compressed air demand over a wide range of air demands and in a way so as to use less input energy during below-peak demand and automatically return the compressor to an operating condition of minimum speed and minimum power input when there is no demand on the compressor. A reciprocating piston compressor with at least two, and typically more than two, compression chambers driven by a prime mover has a separate unloader device for each compression chamber. A control assembly is responsive to tank pressures indicating demand on the compressor with the movement of one movable control member simultaneously operating both a control valve adapted for successively operating each of the unloader devices one at a time and a speed regulating member for the prime mover. Receiver tank pressure is used to pressurize the unloader devices via the control valve and also move the movable control member to decrease compressor speed as each compression chamber is successively unloaded to not compress air and conversely to increase compressor speed and compressor output to restore tank pressure as demand increases. A pressure regulator adjusts the movable control member by sensing the tank pressure when a selected maximum tank pressure is reached and at that time the movable control member is automatically returned to a position to a minimum speed and minimum power input operating condition for the compressor air demand.
REFERENCES:
patent: 1692266 (1928-11-01), Holdsworth
patent: 1692269 (1928-11-01), Osgood
patent: 1756137 (1930-04-01), Saharoof
patent: 1834593 (1931-12-01), Holdsworth
patent: 1998265 (1935-04-01), Aikman
patent: 2476048 (1949-07-01), Lamberton
patent: 2626099 (1953-01-01), Ashley
patent: 3335738 (1967-08-01), Christensen et al.
Donahue Robert L.
Grimmer John E.
Freeh William L.
Grimmer Schmidt Corp.
Lewis, Jr. Ancel W.
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