等壁厚与常规井下螺杆泵对比分析

A comparative analysis of the equal-wall thickness downhole screw pump and the normal downhole screw pump.

常规螺杆泵定子由于橡胶厚度不均匀致使其存在受力、散热和溶胀不均匀等问题,而等壁厚定子螺杆泵通过改变泵体结构,能够保证定子橡胶厚度均匀,从而改善了螺杆泵工作性能。采用ANSYS对常规螺杆泵和等壁厚螺杆泵的定子衬套进行受力和变形研究,找出了2种螺杆泵定子橡胶衬套在不同工况下的受力状态和变形规律,并进行了对比分析,得出了2种螺杆泵的截面型线的变形规律,为型线的设计提供了依据。最后对2种螺杆泵进行了室内性能对比试验,结果表明,在相同压力下,等壁厚螺杆泵的容积效率更高,且在许可的容积效率下,其承压能力更强。

The uneven rubber thickness of the conventional screw pump's stator leads to its uneven stress,cooling and swelling,but the equal-wall thickness screw pump can ensure the evenness of the stator rubber's thickness through change of the pump structure so as to improve the operating performance of screw pump.The ANSYS software was applied to study the stress and deformation of the stator bushing of the equal-wall thickness downhole screw pump and the normal downhole screw pump,finding out the stress condition and deformation law of the bushing of both pumps,obtaining the deformation law of the profile of the cross section of both pumps and providing the basis for the profile design.Finally,the laboratory comparative experiment of the performance of both pumps was conducted.The result showed that under the same pressure the equal-wall thickness pump had a higher volume efficiency and a stronger loading capacity with the permissible volume efficiency.