Micro-processor control of compression ratio at full load in a h

Details Micro-processor control of compression ratio at full load in a h Micro-processor control of compression ratio at full load in a h

1984-10-10

1985-05-28

Gluck, Richard E.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417280, 417282, 417310, 418201, F04B 4906, F01C 116

Patent

active

045197482

ABSTRACT:
An axial flow helical screw type compressor has a slide valve member and slide stop member mounted end to end beneath the intermeshing rotors such that the slide valve member controls communication between the work chamber defined by the rotors and the casing to the outlet port and the slide stop member and the valve member together control the working fluid inlet to the bores of the rotors, the slide valve member and the slide stop being independently movable. Control means for the slide valve member and slide stop include position sensing means for these two members, inlet and outlet pressure sensing means, and means for feeding these inputs into programmable circuitry to control the positions of the slide member and slide stop. Additional control means senses the occurrence of full load operation and then causes the slide valve member and slide stop member to move as a closed unit in a given direction, or the reverse, as the compressor drive motor current is sensed, continuously seeking the position at which such current is at a minimum.

REFERENCES:
patent: 2418835 (1947-04-01), Haugsted
patent: 3380650 (1968-04-01), Drummond et al.
patent: 3535053 (1970-10-01), Jednacz
patent: 3648479 (1972-03-01), Richardson
patent: 3855515 (1974-12-01), Hutchins, Jr.
patent: 4076461 (1978-02-01), Moody et al.
patent: 4080110 (1978-03-01), Szymaszek
patent: 4249866 (1981-02-01), Shaw et al.
patent: 4351160 (1982-09-01), Kountz et al.
patent: 4388048 (1983-06-01), Shaw et al.

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