Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1976-06-07
1979-01-23
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 27, F04B 4902, F04B 4908
Patent
active
041358600
ABSTRACT:
Method and apparatus for controlling the operation of a motor driven compressor which is automatically unloaded when the receiver pressure reaches a predetermined maximum level and loaded when the receiver pressure reaches a predetermined minimum level by means of pressure actuated electric control means which are time delayed to start and stop the compressor motor and the unloading and loading operation in accordance with predetermined mode of operation. The compressor driving motor is controlled to stop immediately upon the receiver pressure first reaching the maximum pressure level whereupon time delay circuit means starts to measure a time interval during which the motor upon having been restarted in response to a restart pulse is prevented from further stoppage each time the maximum receiver pressure level is reached subsequent to the first, whereby the compressor can be brought on load immediately in response to demand for working medium during the measured time interval and whereby overheating of the motor between subsequent stoppages and restarts is avoided. Upon expiration of the measured time interval, the motor will stop running until the minimum receiver pressure is reached, unless the compressor should be on load at such time, in which case the motor will continue running until the compressor again is unloaded upon reaching the maximum receiver pressure level, whereupon the aforementioned cycle is repeated.
REFERENCES:
patent: 2221857 (1940-11-01), Bartholomew
patent: 2267959 (1941-12-01), Teach
patent: 2589006 (1952-03-01), Yerger
patent: 2595369 (1952-05-01), Repscha et al.
patent: 2707440 (1955-05-01), Long et al.
patent: 2720355 (1955-10-01), Widmyer
patent: 2741986 (1956-04-01), Smith
patent: 2793803 (1957-05-01), Yerger
patent: 3424370 (1969-01-01), Law
patent: 3994628 (1976-11-01), Kemper
Atlas Copco Aktiebolag
Freeh William L.
Look Edward
Munson Eric Y.
LandOfFree
Method and device for controlling the pressure of a working medi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for controlling the pressure of a working medi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for controlling the pressure of a working medi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2270995