211g型单螺杆泵可无脉动地工作 g型单螺杆泵工作时，通过螺杆转子与泵套的孔壁间形成的一个个密封腔，平稳地从低压区运送到高压区，在整个运送过程中，介质作纯轴向运动，可完全做到无脉动地运送介质。这一点与齿轮泵不同。齿轮泵工作时，在齿轮的转动下，莫诺定子，介质作轴向与径向及其复合方向的运动，产生明显的搅拌现象。其输出压力的表现形式:g型单螺杆泵的输出压力比较稳定，齿轮泵则出口压力会有波动。这一点在输送高粘度的介质(如重油等)时比较---。
管柱脱落的故障现象是：运行电流很低，基本上是电机的空载电流，除了有一股一股的气外，井口基本上无产液，正发循环时油套连通。the failure phenomenon of the string is: the running current is very low， basically the motors no load current. besides the gas with a single strand of gas， the wellhead basically has no liquid production，&the oil sleeve is connected when circulating.减少管柱脱落的措施有：将油管上扣扭矩由原来的值提高到值；采用油管螺纹垫片；定子上的装卸短节采用防松螺纹连接；采用油管锚或张力封隔器固定螺杆泵。the measures to reduce the falling off of the pipe string are as follows: increase the torque from the original value to the maximum value; use the oil pipe screw gasket; the loading&unloading joint on the stator is connected by loosening screw thread;&use the oil pipe anchor/tension packer to fix the screw pump.
ｂ、转子b， rotors转子的结构也非常简单，主体是钢制杆件，一般外涂耐磨耐蚀的铬合金材料。其作用是传递动力和写定子形成密封腔。the structure of the rotor is also very ---， the main body is steel rod， generally coated with abrasion resistant&corrosion resistant chromium alloy material. its function is to transfer power&write the stator to form a seal cavity.ｃ、回转筒c， rotary barrel回转筒也就是一根内径较大的油管或空心定子筒，接在定子的上部以给转子和抽油杆杆柱以较大的回旋空间，防止转子和抽油杆因偏心运动磨擦磨损油管。a rotary cylinder is also an oil tube/hollow stator barrel with larger inner diameter. it is connected to the upper part of the stator to provide larger swirl space for the rotor&---er rod string， so as to prevent the rotor&---er rod from attrition wear due to eccentric wear.
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