Cable-free balance long-stroke oil pumping unit

Abstract

The invention is suitable for the technical field of oilfield oil pumping units, and provides a cable-free balance long-stroke oil pumping unit. The cable-free balance long-stroke oil pumping unit comprises an oil pumping rod, a bracket, a motor assembly, a connecting rod, a crank, a vertical guide groove and a hinged parallelogram framework, wherein two opposite edge borders extend reversely by certain distances respectively; one end point is taken as a suspension point, and the other end point is taken as a balance point; the oil pumping rod is connected to the suspension point; a slide block is arranged in the vertical guide groove; a counterweight block is fixed on the slide block; the counterweight block is connected to the balance point; two intersection points exist between a connecting line of the suspension point and the balance point and two non-prolonged borders respectively; the bracket is supported on one of the intersection points; one end of the connecting rod is hinged to the movable end of the crank, and the other end of the connecting rod is hinged to any of the two non-prolonged borders. By adopting the equipment, a long oil pumping stroke is realized; moreover, the counterweight block is small in size and is balanced in mass, and a cable is not needed; the parallelogram framework can rotate stably in a balanced manner, so that efficient and stable oil pumping work is ensured.

Description

technical field [0001] The invention belongs to the technical field of oil field pumping units, in particular to a cable-free balanced long-stroke pumping unit. Background technique [0002] At present, the rod pumping equipment in the world is mainly beam pumping unit (commonly known as kowtow machine, hereinafter referred to as kowtow machine), accounting for about 80%; the other 20% is no beam pumping unit (such as tower pumping unit). machine, linear motor pumping unit, hereinafter referred to as linear pumping unit) and other rodless pumping units. [0003] The principle of the kowtow machine is as follows: figure 1 As shown, the kowtow machine has a simple structure and a reliable driving method, but the counterweight load 100 of the pumping unit cannot be completely balanced with the sucker rod load 200, and is limited by the properties of the mechanism, such as the additional dynamic force at both ends caused by the change of acceleration. The unbalanced load incre...

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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a cable-free balanced long-stroke pumping unit, which aims to solve the problem that the existing four-bar pumping unit needs a large mass of balance weight load and driving block, and the equipment needs to work due to the need for cables. Technical problems with potential safety hazards in operation

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