Parallel Shaft Screw Pump Drive Design

Screw pump is one of the most common mechanical oil production device, the conventional screw pump and direct drive screw pump is mainly used in oil field at present stage. How to increase drive efficiency and prevent the rod string reversal is always problems to be solved. The conventional screw pump generally uses the belt and bevel gear transmission mechanism, transmission loss of rotation, inefficiently and big loss because of the belt transmission is easy to slip. In addition usually adopts the ratchet pawl the mechanical anti reverse device, can not be automatically released inversion energy, the need for manual operation, there are serious security hidden danger; Polished rod is directly driven by the motor connection direct drive screw pump, improve transmission efficiency, but due to the lack of speed reducer, motor of the same power cannot meet the requirement of torque, and when the rod reversal also cannot decrease the reverse torque at the end of the motor. Although application of dynamic soft brake device can automatically release reversal, but the device is more electronic components, short service life and frequent replacement. So the research of new screw pump with high efficiency transmission mechanism, as well as anti reverse device, is of great significance for the safe and efficient production of oil field.The new offset type screw pump drive system using high performance plane two stage reducer, this paper focuses on the model driven electromagnetic brake system on the basis of the. By using Solid Works 3D modeling software, after calculation, completed the design of anti reverse device of the electromagnetic brake, and numerical simulation analysis. The calculation results show that the braking electromagnetic brake torque is designed in this paper to 218.2N·m, if in accordance with the gear reduction ratio 10~15, the maximum torque to the output shaft of the speed reducer is driven rod can reach 2182~3273Nm, can completely meet the braking ordinary screw pump rod reversal need. Stress analysis results show that the device can meet the strength requirements. The PLC design, complete electromagnetic special intelligent brake control system, under the control of the system, the electromagnetic brake device can effectively stop the sucker rod reversal, and can automatically release the reverse torque, effectively reduce the reversal caused by pumping rod breaking accident, also prolong the use period, improve safety performance.Analysis of the mechanism of screw pump well torque release, the two stage is discussed in detail in part two rod string reversal of the form, one is the rod itself stored elastic energy inversion stage, another is the oil pressure differential caused similar to the hydraulic motor effect stage. This paper obtains the relationship equation between two stages of rod string unconstrained inversion process inangular velocity, angular acceleration and the reversal time. Theory has practical significance for the research of rod reversal, and brake electromagnetic braking device on the release time interval has a guiding significance.