F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
341/39
F04B 49/06 (2006.01) F01C 1/10 (2006.01)
Patent
CA 1212163
MICRO-PROCESSOR CONTROL OF COMPRESSION RATIO AT FULL LOAD IN A HELICAL SCREW ROTARY COMPRESSOR RESPONSIVE TO COMPRESSOR DRIVE MOTOR CURRENT Abstract of the Disclosure 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 of 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. - 1 -
457502
Murphy David A.
Spellar Peter C.
Ab Ph. Nederman & Company
Fetherstonhaugh & Co.
Frick Company
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