公开(公告)号：US3989993A

公开(公告)日：1976-11-02

申请号：US530316

申请日：1974-12-06

Applicant: Roy D. Ewing

Inventor： Roy D. Ewing

IPC: E21B43/12 ,  F04B1/02 ,  F04B47/02 ,  F04B49/06 ,  H02P7/20

CPC classification number: F04B47/02 ,  E21B43/127 ,  F04B1/02 ,  F04B49/06 ,  F04B2201/121 ,  F04B2205/09

Abstract: A drive and control mechanism for an electrically operated reciprocating apparatus, intended especially for a long-stroke well-pumping apparatus. The mechanism automatically controls the direction of travel of the apparatus and effects reversals at the ends of each stroke. On start-up the apparatus always travels in a direction toward its farther limit of travel. Control is effected without series of sequentially operating relays which can shut down the apparatus unnecessarily in the event any one relay drops out accidentally, as can result from a voltage drop. The circuit includes protective means for shutting down the apparatus immediately in the event certain malfunctions occur, for example, if the parts travel beyond proper limits, or if the apparatus commences to operate at excessive speed, or if a motor overheats.

Abstract translation: 用于电动往复运动装置的驱动和控制机构，特别用于长冲程井泵装置。 该机构自动控制设备的行进方向，并在每个行程末端产生反转。 在启动时，设备始终沿着其更远的行进极限的方向行进。 控制是在没有一系列顺序工作的继电器的情况下实现的，可以在任何一个继电器意外掉电的情况下不必要地关闭设备，这可能是由于电压降而导致的。 该电路包括用于在某些故障发生的情况下立即关闭设备的保护装置，例如，如果部件超出适当的限制，或者设备开始以超速运行，或者电机过热。