Design and Experimental Research of a Plastic Gerotor Pump

The article presents a construction solution of a gerotor pump in which the set of gears and body is made of plastic and the results of theoretical and experimental research of this pump. As the initial shape of the body, a square prism was assumed. It consists of three parts, i.e., the front, middle and back bodies, which are connected by screw connections. Using the excavate method, the basic shape of the body was formed within the outline of the initial shape. This shape was subjected to strength analysis using the FEM method. The purpose of these analysis was to determine the place, character and value of stresses and deformations of the basic shape body. These analysis have shown that the pump body deforms both in the axial direction, i.e., along the axis of the pump shaft, as well as in the radial direction, i.e., perpendicular to the axis of the shaft. In order to reduce the values of stresses and deformations, the basic shape of the body was modified to obtain a modified shape of the body. It was subjected to further strength analysis by the FEM method. The modifications have led to a reduction in the value of stresses and deformations. Using the modified shape of the body, a design of gerotor pump made of POM plastic was developed and its model was made. The pump with such a body worked correctly in the pressure range $p =$textbf 20 bar and rotational speed $n =$textbf 1000 rpm.