The Structure Design Of Twin-Screw Pump Screw Rotor And Performance Analysis And Optimization

Oil, gas and water multiphase mix-transportation has become a modern industry inevitable trend, particularly the oil and gas gathering, transportation. As the key equipment in mix- transportation systems, efficiency and reliability of the multiphase pump is the focus of the entire transport system. With its strong applicability and significant performance advantages, screw pump is widely used in petrochemical industry, machine tool hydraulic systems and other industrial uses. As a research object in this paper, twin-screw pumps screw rotor end profile is analyzed with the finite element software in dynamics and static of the screw rotor structure combined with the actual conditions, and light-weight design improvement as well as optimizationAs the core technology, the tooth profile of screw directly determines the performance parameters. Through establishment the profile equation of the end face and three-dimensional model of the screw rotor, this paper analyzes the influence of geometrical parameters and different geometric dimensions of spiral tooth profile to the properties of pumps. In addition, optimized selection of the key performance indicators of screw pumps by orthogonal test is done. As it meets the commonly lead conditions, a theoretical displacement and leakage of the pump are selected to provide dynamics and statics analysis numerical basis of screw pumps rotor. By orthogonal test method in the premise of meeting the theory quantity of flow, with the aim to select small leakage, the structure parameter of screw rotor profile will be optimized.Dynamics analysis of the structure is the key step in this article. Depending on the screw rotor solid modeling, mesh division unit, the boundary conditions and constraints, calculation of each mode shapes and frequencies of the screw rotor in the absence of prestressed and prestressed use of modal analysis workbench module, we analyze whether the screw rotor resonance phenomenon occurs and the maximum deformation values in normal condition during operation. With the screw rotor harmonic analysis and the analysis of the amplitude variation curve of the screw rotor at different frequencies, we provide a reference of loading frequency section for the actual work process.Based on the screw rotor lightweight design, this article focuses on the design by an order optimization method, parametric modeling by means of parameter expressions, parametric coordinates, the use of design variables, statics analysis to screw rotor drive shaft with APDL programming language of ANSYS. Combined with its light-weight improvements, we try to find the maximum stress and maximum deformation the screw rotor driveshaft suffers and the best shaft diameter under the optimizing goal, to provide a reference for theoretical study and practical work.