Abstract: The finite element calculation is made to stress situation of the doublehelix single screw pump by the use of common software (ANSYS). The deformation, stress and strain's distribution of the doublehelix single screw pump bush are discussed when the bush is under equal pressure, disordered pressure and the static contact with the bush and screw. The stress state and deformation regularity of the doublehelix single screw pump bush are revealed, and the influence of condensability of the bush material on the deformation discussed, which offer the reference to the optimal design of the structure and the performance improvement of doublehelix single screw pump.

Key words: double helix single screw pump, bush, Finite element analysis, ANSYS, optimal design