Dynamic Performance Simulation And Experimental Research Of Circular Arc Helical Gear Pump

Against to the high performance small-scale circular arc helical gear pump used in aviation,aerospace,aircraft,marine,and automobile industries,some problems such as flow leakage,temperature rise significantly,high radial force have arisen with high speed and high pressure.In order to improve gear pump performance,the problems that appeared need to be research and analysis,and make corresponding improvements,therefore,dynamic performance simulation and experimental research of high performance small-scale circular arc helical gear pump are carried out in this article.Aiming at the problem of flow leakage in the operation of high performance small circular spiral helical gear pump in the case of high pressure and high speed working condition,Based on the basic equations of fluid mechanics,considering the influence of the original end face gap,the original radial clearance and the temperature on the viscosity of the hydraulic oil,the radial clearance caused by the deformation of the gear pump body and the influence of the radial flow of the sliding bearing on the leakage,The flow leakage model of circular spiral gear pump is established,and the influence law of each factor on the flow leakage is analyzed.The fluctuation and fluctuation of the fluid pressure fluctuation and the fluctuation of the flow rate of the high performance small circular spiral helical gear pump have important influence on the noise and vibration.In this paper,the three-dimensional simulation of the internal flow field of the gear pump is carried out by using Fluent.The influence of load and speed on the fluctuation of the pressure and flow field in the gear pump is analyzed by simulating the internal flow field of the gear pump.And the correctness of the flow leakage model of the circular helical gear pump is verified by the flow calculation.The influence of the cavitation on the internal fluid pressure fluctuation and the fluctuation of the flow rate is analyzed.In the case of high-pressure and high-speed working conditions,the radial force of the rotor is large,which makes the sliding bearing easy to wear and cause the temperature rise.Aiming at the problem that the temperature rise of the sliding bearing and the pressure drop of the plain bearing cannot balance the whole radial force,In this paper,the three-dimensional simulation of the internal flow field of the sliding bearing is carried out by Fluent.The influence of the inlet pressure,the speed,the eccentricity,the angle and the diameter of the inlet port on the pressure of the hydrostatic pressure and the bearing temperature are analyzed.Through the optimization of the inlet diameter and position angle,the pressure of the hydrostatic tank is improved and the temperature rise of the sliding bearing is reduced.In order to verify the correctness of the simulation results of circular spiral helical gear pump flow leakage model and internal flow field dynamic performance,the experimental study of gear pump prototype is carried out.In this paper,the performance test platform and data acquisition system of the circular helical gear pump are set up.The temperature of the gear pump is tested by the temperature sensor,and the temperature rise law of the gear pump is analyzed and the effect of the sliding bearing in the gear pump is verified.The flow rate of the gear pump is tested,and the leakage law of the gear pump is analyzed.The correctness of the leakage model and the simulation results of the internal flow field of the gear pump are verified.