Control circuit for shutting off the electrical power to a liqui

Details Control circuit for shutting off the electrical power to a liqui Control circuit for shutting off the electrical power to a liqui

1979-10-31

1981-09-01

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 18, 417 33, 417 63, F04B 4900

Patent

active

042869250

ABSTRACT:
A control circuit for turning off the electrical power to the drive motor, which reciprocates a polished rod of a pump, when the pump has exhausted the supply of liquid in the well. Simultaneously measuring the polished rod load and rod position and turning off the power when the load is greater than or equal to a preset load and the position is equal to a preset position on the downstroke of the well. A first comparator measures the polished rod load relative to a preset load, and a second comparator measures the polished rod position relative to a preset point so that the power is shut off when the load is greater than or equal to the preset load and the position is equal to the preset point on the downstroke. A set of digital latches act to insure that the load is greater than the preset load for two consecutive strokes before the power is shut off. Measuring when the polished rod load is less than a preset load and the polished rod position is equal to a preset point on the upstroke and turning off power to the well and signalling that an abnormal condition exists at the well. Connections are provided for an external plotter so that a plot of load versus position can be plotted to give a visual representation of the well activity.

REFERENCES:
patent: 2577479 (1951-12-01), Owen et al.
patent: 3269320 (1966-08-01), Tilley et al.
patent: 3306210 (1967-02-01), Boyd et al.
patent: 3851995 (1974-12-01), Mills
patent: 3953777 (1976-04-01), McKee

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