螺杆泵属于容积泵类.随着机械制造技术和工程材料的发展,它的应用范围逐步扩大,六十年代已开始用于地质岩心钻探的施工中.螺杆泵结构简单,主要由定子和转子组成.其工作原理和精密螺旋运输机相似.当转子在定子中回转,就形成许多空穴,带着新泵送的流质向排出方向前行,转子不断回转,流质便持续地排出.定子能用多种材料制造,一般用天然或合成橡胶做定子.用较软的天然橡胶,能适应泵送粗糙和带摩擦性的流质;用硬胶则适应于泵送压力较高、摩擦性较小的流质.此外,还可采用工具钢、不锈钢、四氟乙烯、氯乙烯或尼龙做材料. With the development of mechanical manufacturing technology and engineering materials, its application range has been gradually expanded, and it has been used in the construction of geological core drilling in the 1960s. The screw pump is simple in structure and mainly consists of a stator and a rotor . Its working principle is similar to that of a precision screw conveyor. When the rotor rotates in the stator, many holes are formed, with the newly pumped liquid material going forward in the discharge direction and the rotor continuously rotating, and the liquid substance is continuously discharged. The material is made of natural or synthetic rubber stator, soft natural rubber can be used to pump the rough and frictional liquid; hard plastic is adapted to pump higher pressure, less friction liquid In addition, tool steel, stainless steel, tetrafluoroethylene, vinyl chloride or nylon can be used as the material.