Study On Dynamic Characteristics Of High Speed And High Pressure Double Arc Helical Gear Pump

Gear pump is a common fluid transfer and conveying element.Because of its simple structure,high efficiency,and not easy to be contaminated by oil,it is widely used in aviation,aerospace and marine fields.With the development and progress of science and technology,the performance requirements of gear pumps are also getting higher and higher,which is mainly reflected in the high speed,high pressure and miniaturization of gear pumps.In order to ensure the stability of the gear pump under high speed and high working pressure,it is necessary to carry out technical research on the dynamic characteristics of the gear pump.This article takes the double-arc helical gear pump as the research object,analyzes the dynamic characteristics of the main components of the gear pump and the whole machine and optimizes the structure,and provides a basic model and method for the future research of high-performance gear pumps.The thesis first establishes a three-dimensional solid model of a double-arc helical gear pump.The finite element software ANSYS is used to perform static analysis and modal analysis on the gear pump rotor system,pump body,sliding bearing,front pump cover,rear pump cover and the whole machine analysis.According to the analysis results,the structural weak links in the original scheme were found,and the structure of the original gear pump was optimized and improved based on the analysis.The rotor system is an important part of the gear pump.After reducing the diameter of the rotating shaft and making it lightweight,it still meets the requirements.The pump body is an important support for gear pumps.The goal is to reduce weight.In the original design,the maximum structural stress is far less than the material’s ultimate stress.On the premise of excess design margin,the pump body is topologically optimized.The weight is reduced by 5%,and the stiffness is improved co MPared to before optimization.Aiming at the problems of complex bearing of gear pump sliding bearings and the easy wearing of metal materials,the sliding bearings were optimized with new lightweight materials,and co MPare silicon nitride and silicon carbide two solutions,finally silicon carbide was selected.In the original design,the first-order natural frequency of the double-arc helical gear pump is 2234.7Hz,and the weight of the whole machine is 13.5499 kg.After optimization,the first-order natural frequency is 2392.6Hz,the weight of the whole machine is 11.2394 kg,and 17% weight is reduced,the natural frequency of the whole machine is higher than the rotation frequency of the rotor system from 0 to 166.67 Hz,and no resonance occurs.By analyzing the dynamic characteristics of the double-arc helical gear pump and optimizing and improving the structure,the structural rigidity of the gear pump is increased,the natural frequency of the structure is increased,the natural frequency between the main components of the gear pump,and the natural frequency of the whole machine and the rotor The frequency shift separation between the system rotation frequencies improves the dynamic performance of the original double circular arc helical gear pump.