Kinematics Analysis And Flow Field Simulation Of Opposed Biconical Cone Screw Seawater Hydraulic Pump

Opposed biconical cone Screw seawater hydraulic pump is a new type positivedisplacement pump with new structure and working principle, which is based on theprinciple of moving and changing chambers by the cone spiral motion pair. Itbreakthroughs traditional hydraulic pumps structure, using two opposed cone-screwpair in hydraulic pump unprecedentedly. Having less friction pairs and no flowdistribution devices, the pump can eliminate some defects on structure andperformance in the exciting hydraulic pumps. In this paper, Kinematics characteristicsand flow field distribution of the opposed biconical cone Screw seawater hydraulicpump are analyzed, providing theoretical basis for the design of the pump.Cone screw-bush pair is the key component in the opposed biconical cone Screwseawater hydraulic pump. Spatial meshing principle of the pair s surfaces istheoretically analyzed. And displacement and velocity equations of different points onthe screw were presented. The motion simulation of the pair is also conducted usingPro/Mechanism, studying the screw s motion trajectory and law.The fluid dynamics model of the pump with screw-bush pair is established. Theflow field for different pump pressure conditions and different positions of the conescrew rotor were numerically simulated, in which the pressure distribution in thesealing cavity and the hydraulic force on the rotor were obtained．A new surface building method of the pair based on plan cross-section elementsand cylindrical helix is proposed. And the sealing mechanism, modeling method,motion law and flow distribution in the pump with the new screw-bush pair arestudied. Comparing with the traditional pair, the new one is considered to have moreadvantages. It has good sealing characteristics, easier surface building method andmodeling process, no axial displacement of screw, and more stable flow distribution.Several influence factors on the performance and life of the opposed biconicalcone Screw seawater hydraulic pump are studied. Based on the design theory of thetraditional single screw pump, the structure design steps for the new pair are given.