Electromechanical combined speed change transmission device and oil pumping unit

Abstract

The invention discloses an electromechanical combined speed change transmission device and an oil pumping unit. The electromechanical combined speed change transmission device comprises a driving motor and a speed change device; the speed change device comprises a speed change rod, a first gear, a second gear, a synchronizer, a third gear and a fourth gear; when the speed change rod is in a firstposition, the first gear and the third gear are matched and engaged to form a first gear chain way with a first transmission ratio; when the speed change rod is in a second position, the second gear and the fourth gear are matched and engaged to form a second gear chain way with a second transmission ratio; the stepless speed adjustment of the driving motor is controlled through adjustment of electric parameters; and the driving motor drives the speed change device to drive a driven belt wheel to rotate. The mechanical speed change is realized through the gear chain ways with different transmission ratios, meanwhile, the electric speed change is realized through adjustment of the rotating speed of the driving motor, and the stroke frequency adjusting range is widened through electromechanical combined speed change, so that the oil punching unit is effectively suitable for low-permeability oil fields and low-yield well conditions.

Description

technical field [0001] The invention relates to the technical field of mechanical transmission in oil field production, in particular to an electromechanical combination variable speed transmission device and an oil pumping unit. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] A pumping unit is a ground-driven device that pumps oil with a rod. According to its basic structure, it can be divided into two categories: beam beam type and beamless type. At present, the beam pumping unit is the most widely used at home and abroad. It is driven by a motor through a belt drive and a two-stage cylindrical gear reducer, and the beam is driven by a crank, connecting rod, and beam to realize reciprocating swing. [0004] The required start-up torque of the existing beam pumping unit is...

AI Technical Summary

Problems solved by technology

[0004] The start-up torque required by the existing beam pumping units is more than twice that of normal operation, so the power of the motors used in the design is relatively large

However, during normal oil pumping, due to the lighter load and the smaller required torque, there is a problem that the load characteristics of the sucker rod do not match the mechanical characteristics of the motor, which leads to a serious phenomenon of low power utilization of the motor

Especially when the donkey head is lowered, because the load becomes lighter, the motor is basically in a state of free decentralization at this time, which reduces the power factor of the grid and the efficiency of the motor, and cannot meet the requirements of low-permeability oil fields and low-production wells for low-stroke pumping

[0005] In low-permeability oilfields and low-production wells, the pumping unit is required to have a low pumping frequency. Excessively high strokes will cause most low-production wells to operate for a long time under low submergence or even severe fluid shortage, which will not only cause pump efficiency Low, low system efficiency, a large waste of system energy consumption, and also seriously deteriorated the working conditions of the oil well pump and sucker rod, seriously aggravated the wear of the oil well pump, the breakage of the rod and tube, the partial wear of the rod and tube, and reduced the pump inspection cycle. Increased cost of oil well pumps

[0006] However, due to the limitation of the transmission ratio of the transmission device, the beam pumping unit widely used at present has a relatively high stroke rate, which is mostly suitable for high-permeability oil fields and high-production wells, but cannot meet low-permeability oil fields and low-production wells for low-stroke pumping. requirements, that is, the existing pumping units have a narrow application range and are generally not suitable for low-permeability oil fields and low-production well conditions.

[0007] Therefore, the existing pumping unit has a narrow application range and is not suitable for low-permeability oil fields and low-production well conditions.

Images