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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0634544 (1984-07-25) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 23 인용 특허 : 4 |
An improved pump control having a device for measuring relative movement between structural components of a pumpjack unit, and converting the movement into a signal which varies according to the magnitude of the movement. The signal is divided into an upstroke and downstroke component so that during
In a control system for the control of a prime mover of an oil well pumpjack apparatus which drives a downhole pump by means of a rod string, wherein the pumpjack unit includes structural components affixed to one another for reciprocating the rod string, the improvement comprising: control means by
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