Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1998-06-30
2000-05-30
Thorpe, Timothy S.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 13, F04B 4900
Patent
active
06068447&
ABSTRACT:
The present invention provides a controller for an air compressor system. The air compressor system includes an air compressor, control unloaders on the air compressor to prevent the air compressor from compressing gases when signaled to unload, an electric motor for driving the air compressor, and a tank for receiving and storing compressed gases from the air compressor. The controller has an adjustable pressure switch to raise or lower the discharge pressure. The differential pressure is pre-set in the pressure switch. The controller includes two methods of operating the air compressor, each of which is manually selected by operating a switch that will designate start/stop control or automatic dual control at the option of the operator. The start/stop control will start the motor when the pressure in the system reaches a predetermined low point. When the preselected high pressure point is reached, a signal is sent to the motor to stop, thereby ending the compressing cycle. When the automatic dual control mode is selected and when the high pressure point is reached, the compressor unloaders are actuated, the motor continues to run and the compressor operates in the unloaded or idling mode. When the aforementioned unloaders are actuated, the unloader time accumulates and times the manually set idle period the compressor will run before shutting down the motor. If during the idle time the system pressure drops to the preselected low point, the unloaders are disabled and the compressor begins to pump to satisfy the compressed air load requirement. The controller also includes a power on/off switch, a running timer, an emergency shutdown with indicator light with remote signaling capability, and an autodrain feature based upon production of compressed air. The controller is adaptable to both rotary screw and reciprocating air compressors.
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Thorpe Timothy S.
Torrente David J.
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