Symmetrically balanced chain type oil pumping unit

Abstract

The invention provides a symmetric balancing chain drive pumping unit which is a double-chain system pumping unit which is designed for solving the problems of poor reliability, high failure rate of a balancing mechanism and a reversing mechanism, etc. The double-chain system pumping unit adopts a chain sprocket transmission mechanism to transfer power based on the symmetric balancing principle, and completes reversing through two crank shaped chain links, and improves the reliability of the whole pumping unit based on the maintenance of the characteristics of the prior chain-drive pumping unit, such as long stroke, large load, light weight, nodes and so on, so that the operation is more stable.

Description

technical field [0001] The invention relates to an oil production mechanical device, in particular to a chain pumping unit for reciprocating balance by mechanical weights. Background technique [0002] At present, conventional beam pumping units are widely used in underground oil and gas extraction devices. Although it has the advantages of simple structure, reliability and durability, and easy maintenance, it is increasingly difficult to meet the needs of deep wells and heavy oil wells. Long stroke and large load are required. In this case, the chain pumping unit has the advantages of long stroke, small inertial load, small mass and small footprint. However, the problem of balance and reversing has not been well solved. Less reliable. The traditional chain pumping unit includes a set of chain and sprocket system. The main factor affecting its reliability is the poor reliability of its chain links and chains. There are two kinds of uneven stress in this connection method fr...

AI Technical Summary

Problems solved by technology

[0002] At present, conventional beam pumping units are widely used in underground oil and gas extraction devices. Although it has the advantages of simple structure, reliability and durability, and easy maintenance, it is increasingly difficult to meet the needs of deep wells and heavy oil wells. Long stroke and large load are required. In this case, the chain pumping unit has the advantages of long stroke, small inertial load, small mass and small footprint. However, the problem of balance and reversing has not been well solved. poor reliability

The traditional chain pumping unit includes a set of chain and sprocket system. The main factor affecting its reliability is the poor reliability of its chain links and chains. There are two kinds of uneven stress in this connection method from a mechanical point of view. One is that on the plane of the chain track, the eccentric force will generate a considerable lateral bending moment to act on the chain; the other is that on the normal plane of the track plane, only one side of the balance weight is stressed, and a second side bending will inevitably occur Torque, also acting on the chain

These two torques make the special link of the chain distort and deform in the respective directions of the torque for a long time. Coupled with the impact of the reversing, the stress situation at this place is relatively bad, which leads to frequent chain breaks, and indirectly increased cost

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