Design Theory And Simulation Study Of Water Hydraulic Twin-screw Pump With Medium And High Pressure

Water hydraulic drive not only possess the advantages of hydraulic drive but alsohas such merits of environmental protection, safety, low price and wide availability,which could perfectly satisfy people’s increasing requirements of environmentalprotection. At present, water hydraulic drive has become the frontier in the field ofhydraulic drive and control and has a promising prospect.Hydraulic pump, being the core element in the hydraulic drive system, plays asignificant role in the function of the whole system. Based on document research, thisarticle gives a comprehensive elaboration about the current development and researchstatus of the water hydraulic pump and the screw pump, both domestically and overseas.However, there is still no relevant research done on the water hydraulic screw pump,which possesses such advantages as steady transmission medium, small pressurefluctuation, simple structure, insensitive to medium viscosity, etc. It has been widelyused in various industries. Thus, water hydraulic screw pump is a great potential newresearch direction.Screw pump is a kind of volume type rotor pump, depending on the volume changecaused by the sealed cavity, which is formed by the screw and bushing, to inhale anddischarge the fluid. Screw, acting as the core element of the screw pump, the profiletype determines all the property indexes of the screw pump. This article makes a deepstudy on profile design of screw, the key element of the twin-screw pump, and analysesthe geometrical properties of the profile. In addition, analysis on the constrained modaland transient dynamic of the screw provides a reference for determining not only thegap between the main and the driven screw but also the gap between the screw andbushing. Then, Fluent, the software, is adopted to simulate the flow channel of thetwin-screw pump, which gives birth to the pressure nephogram and velocity vector ofthe pump model. Analysis on the flow field’s changes in flow and hydraulic pressure iscarried out, based on the pressure nephogram and velocity vector. At last, a predictionon the performance of the twin-screw pump is outlined.