偏心螺杆泵顾名思义即在泵内只有一根螺杆.沿用我国单螺杆泵行业的习惯命名，通常将偏心螺杆泵的螺杆称为转子，螺杆衬套称为定子。由外界动力源驱动的转子和定子相啮合，构成将吸入腔和排出腔相隔开的密封腔，使泵能有效地工作。 目前世界各国生产的螺杆泵，其转子和定子构成的啮合副，绝大多数的产品还是单头螺旋的转子和双头内螺旋的定子相啮合。近十多年来国外有些厂商开发双头螺旋的转子和三头内啮合螺旋的定子相啮合的单螺杆泵进展很快。个别的厂商已发展到大批量生产和销售。我国也有少数制造厂进行研制，目前尚处在开发阶段。
用偏心螺杆泵替代离心泵输送浮渣来解决离心泵堵塞的问题。
An eccentric screw pump was used in place of centrifugal pump for conveyance of scum, so as to solve the clogging of the latter.
单螺杆泵是一种新型的内啮合回转式容积泵。主要工作部件是偏心螺杆（转子）和固定的衬套（定子）。
Single-screw pump is a new volume of the inner rotary gear pump. The main working parts are eccentric screw (rotor) and fixed bushing (stator).
单螺杆泵在发达国家已广泛使用，国外多数称单螺杆泵为“莫诺泵”《MONOPUMPS》，德国称为“偏心转子泵”。
Single screw pump has been widely used in developed countries, most of the foreign said single screw pump as "Monod pump" "MONOPUMPS", Germany called "eccentric rotor pump".
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