Design and simulation of meshing of a particular internal rotary pump

This paper presents a complete description of a specific geometry applicable to internal rotary pump. A particular design is considered, characterized by superior flow-rate performance and a different contact mechanism in respect with the common trochoidal pumps. All the necessary aspects regarding the kinematics and operation of the machine are taken into account, by means of a mathematical formulation. In particular, the kinematic analysis considers the possible presence of transmission errors and assures the absence of interference by a tooth contact analysis. The achieved mathematical model allows the designer to obtain the complete definition of the rotor profiles in parametric form.

► We studied an original profile for internal rotary pumps. ► The profile shows many potential advantages in respect with the epitrochoidal design. ► The profile geometry is explained and parameterized. ► A tooth contact analysis is performed to consider possible transmission errors. ► Corrections in the profile are proposed for feasible design of the machine.