Study of the stator geometry for a Moineau pump

Abstract

Abstract Moineau pumps are volumetric pumps with progressive cavities and have an eccentric rotor towards the rotation axis. The eccentric rotor performs a rotational movement towards a stator, usually made of an elastomer moulded in a cylindrical tube. Producing the pump involves knowing the cross-section of the helical rotor model, as well as knowledge of the stator shape as a complex surface, and of the enwrapping of the rotor lobes in their relative movement, in relation to the stator. An analysis for the trilobed helical pump case is proposed, in which, by defining the rotor shape, the stator model can be formed. The two objects, the rotor and the stator are in reciprocal enwrapping movement, as a result of the revolving without sliding movement (rolling) of two circular centrodes, defined in relation to their front sections. The helical surfaces of the rotor and stator are cylindrical helical surfaces.