Pumps – Condition responsive control of pump drive motor – By controlling drive motor motive fluid
Patent
1981-12-30
1984-07-31
Look, Edward K.
Pumps
Condition responsive control of pump drive motor
By controlling drive motor motive fluid
60372, 60379, 417399, F04B 4900
Patent
active
044627599
ABSTRACT:
An emergency shutdown system for an air-balanced pumping unit which includes a pump motor, a walking beam driven by the pump motor, a rod string reciprocated by the beam, and an air-balance cylinder and an air receiver which together define an air spring for storing energy from the beam is disclosed. A lever arm is pivotally mounted on the walking beam and attached at one end to the rod string so that a rotational moment is exerted in proportion to the weight of the rod string. Such rotational moment is opposed by an air bag, the output force of the air bag being adjustable within the expected range of the rotational moment. Thus, by properly adjusting the air bag, loss of load on the rod string results in movement of the lever arm. A shutdown valve is operatively connected to the lever arm and bleeds air from the air cylinder upon loss of load.
REFERENCES:
patent: 2577479 (1951-12-01), Owen et al.
patent: 3306210 (1967-02-01), Boyd et al.
patent: 3369490 (1968-02-01), Hawk
patent: 3632234 (1972-01-01), Lake
patent: 3782117 (1974-01-01), James
All American University, Incorporated
Look Edward K.
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