Apparatus for generating an electrical signal which is proportio

Details Apparatus for generating an electrical signal which is proportio Apparatus for generating an electrical signal which is proportio

1980-11-03

1982-12-14

Myracle, Jerry W.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

73151, 7386245, F04B 4906

Patent

active

043636055

ABSTRACT:
Apparatus for generating an electrical signal which is proportional to the tension in a bridle which supports a string of sucker rod associated with a pumpjack unit. The apparatus includes a main frame having a load cell mounted thereto, and opposed cable engaging arms, one of which extends from the load cell to a cable of the bridle. The two arms place the load cell in compression thereby generating an electrical signal in proportion to the magnitude of the force exerted to spring the spaced parallel cables apart from one another. The signal is utilized to obtain an indirect measurement which is proportional to the tension in the sucker rod. This signal can be combined with another signal related to the position of the walking beam of the pumpjack unit to thereby provide a dynamometer card. The signal is also used as a pump off control which discontinues current flow to the pumpjack motor when the signal assumes a predetermined electrical configuration.

REFERENCES:
patent: 2189552 (1940-02-01), Raphael
patent: 2645121 (1953-07-01), Scott
patent: 2720112 (1955-10-01), Coyne et al.
patent: 3023615 (1962-03-01), Bennett
patent: 4043191 (1977-08-01), Mills
patent: 4208665 (1980-06-01), Mills

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