Pumps – With condition responsive pumped fluid control – Responsive to pump created drive motor condition
Patent
1978-03-01
1981-02-10
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Responsive to pump created drive motor condition
417282, 417290, 417310, F04B 4902
Patent
active
042498660
ABSTRACT:
An electronic control system for sequential actuation of a four-way solenoid valve is used to selectively load and unload a slide valve control for a screw compressor. The electronic control system is responsive to output air pressure and pulses a four-way solenoid valve to selectively load and unload the system so that it will maintain system pressure within a preselected deadband. Selective pulsing of the four-way solenoid valve is used to gate hydraulic fluid to load and unload chambers separated by a piston coupled to a slide valve which shifts longitudinally and changes the capacity of the screw compressor. The control system senses output line pressure, and when a limit pressure is exceeded, a dump solenoid valve and fast-unload system is actuated to entirely unload the system of air pressure until reduced to a level below the set deadband. The control circuit also monitors current to the motor which drives the screw compressor. When the motor current is above a normal limit, further loading of the compressor is inhibited. If the current continues to rise, indicating a decrease in voltage available for power, the compressor is driven to an unloaded state until the current matches the preset normal limits. By use of electronic control for selective pulsing of the four-way solenoid valve, energy savings are realized by maintaining operation within a narrow deadband of operation.
REFERENCES:
patent: 1997476 (1935-04-01), Wallene
patent: 2007388 (1935-07-01), Tarleton
patent: 3936239 (1976-02-01), Shaw
patent: 4052135 (1977-10-01), Shoop et al.
patent: 4068980 (1978-01-01), Fine et al.
patent: 4076461 (1978-02-01), Moody, Jr. et al.
patent: 4080110 (1978-03-01), Szymaszek
First David J.
Shaw David N.
Dunham-Bush, Inc.
Smith Leonard E.
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