The Design Of Three Screw Pump And Research Of Rotors' Profile Lines Optimization

Three screw pump is a positive displacement pump which has high technology. Because of structure proper redistribution,energy-saving,small hydraulic impulsive> wide applied range on spread of viscosity,great feeding flux,calm and credibility,longevity and so on, three screw pump is extensive used in oil industry,chemical industry,metallurgy,shipping. Three screw pump is one of high degree of accuracy mechanical manufacture, it requirements high degree of accuracy in design and manufacture, so it is difficult in machining about the three screw pump. Now we just do some research in mapping and machining about three screw pump. So there is much problem in the manufacture, such as unbalanced movement,large power wastage,wear and tear quickly> low natural life and so on. Block the development and adhibition about the three screw pump. So it is very necessary to do some research in design,stress and optimization about molded lines.With the analysis in transmission principium and structure modality about the three screw pump, study the demand and the way of the design of rotor molded lines. Making out the mathematics equation of the rotor molded line. Establishing three-dimensional model about the three screw pump in the 3-d design software, do some virtual assemble and interference checking. Analyzed the mechanical characteristics and the problem in addendum correction of the rotor. Do some numerical Simulation about the screws with finite element methods. Optimize the addendum with involutes. The follows are the main study contents.â‘ Analysis the transmission principle and structure characteristic, and research the sealed situation of the three screw pump.â‘¡study the design requirement of the rotor shape about the three screw pump. Analysis the design methods about the rotor shape in screw. Deduce the profile curve about the screw. Establish three-dimensional model about the screw pump. Do some virtual assemble and interference checking.â‘¢Screws' rotors were force analyzed, the main and driven screw's 3D finite element model was established, at the same time, their stress distribution were numerical simulation by the finite element method.â‘£Three screw pump rotor's profile line's problem and its optimization method was analyzed, then main and driven rotors' profile line were optimized, deduced the optimization curves' equations, in that way, it greatly improved screws' processing technology and force conditions.