节流口/节流杆排量信号控制机构分析与研究

Research on Discharge Signal Control Mechanism of Throttle Gate /Throttle Bar

节流口与节流杆机构是井下控制机构中的典型机构,既可作为主轴执行机构的前驱机构,为其提供动力,还可根据节流压降的变化监测其运动形成,达到遥控目的。介绍了节流口与节流杆机构的结构、工作原理、设计参数和设计要求,分析了节流活塞、节流口机构以及节流口+节流杆机构的工作特性。分析结果表明,若要提高节流口机构控制系统的稳定性,应增大阻尼系数或减小弹簧刚度和活塞机构质量,若要提高其快速性,应增大弹簧刚度或减小活塞机构质量;若要提高节流杆机构控制系统的稳定性,则应减小弹簧刚度和活塞机构质量,增大节流杆与孔间缝隙、孔直径等,若要提高其快速性,则应增大弹簧刚度和减小活塞机构质量,减小节流杆与孔间缝隙、孔直径。为保证上述2系统具有良好的稳定性和快速性,应调节各参数,找到二者的平衡点。

The throttle gate and throttle rod are typical components of downhole control mechanism, which ei- ther work as a forerunner mechanism of main shaft executive unit to provide power, or monitor its own movement through the changes of throttle pressure drop to achieve remote control. The structure, operating principle, design parameters and design requirements of the throttle gate and throttle rod mechanism are introduced, and the throttle piston, throttle gate and the operating characteristic of throttle gate and throttle rod mechanism are analyzed. The results show that damping factor should be increased while spring stiffness and mass of the piston mechanism should be reduced to improve the throttle gate control system stability. To improve the rapidity of throttle gate control sys- tem, spring stiffness should be increased but the mass of the piston mechanism should be reduced. In order to im- prove the stability of the throttle rod mechanism control system, the spring stiffness and the mass of the piston mechanism should be reduced while the rod and gate gapping and the gate diameter should be increased. While to improve the rapidity of the throttle rod mechanism control system, the spring stiffness should be increased but the mass of the piston mechanism, the rod and gate gapping and the gate diameter should be reduced. The parameters should be optimized to ensure a good stability and rapidity balance of the throttle gate and throttle rod mechanism.