Research On The Principle Of Valuing Main Performance Parameters Of Non Contact Cosine Rotor Pump

Cosine rotor pump is a kind of rotary positive displacement pump,which has the advantages of low coincidence,simple structure and long servicing life.The continuous progress and development of science and technology also put forward higher requirements for the performance of rotor pump,rotor pump is developing in the direction of high pressure,low pulsation,small volume and large displacement.At present,the research on cosine rotor pump is relatively few,because the rotor is the core part of the rotor pump,in order to obtain the high-Performance cosine rotor pump,this paper explores the influence rule of the main performance parameters of the cosine rotor,studying the regularity which affects the pump.The main work is presented as follows:Firstly,deducing the cosine rotor profile equation,basing on Matlab program code to make 3D modeling become convenient.The feasibility of cosine rotor engagement was theoretically analyzed,at the same time,observing the end face of cosine rotor and find the oil trapping phenomenon.The area utilization coefficient and curvature of cosine rotor are deduced theoretically,and further analysis get the utilization extent that different parameters of rotors use pump cavity and curvature variation law.Secondly,using volume change method to deduce the expression of instantaneous flow rate of cosine rotor pump,and the diagram of instantaneous flow rate change of four tooth cosine rotor pump in one revolution is obtained.It is found that the instantaneous flow rate change eight times in one revolution.The ideal and approximate displacement of the rotor pump were calculated,and the correctness of the formula was verified by using the CAD area query function simultaneously.Based on the above formula,exploring the influential regularity of the main performance parameters of the cosine rotor,at the same time,in order to conform to the development trend of large displacement and small volume of the rotor pump,summarizing the matters that should be paid attention in the design process.Thirdly,establishing a two-dimensional model to carry out mesh division and boundary setting of the model,combining flow field analysis of different cosine rotor pump models with Fluent to get pressure distribution and velocity distribution neographs of the internal flow field of the three-tooth,four-tooth and five-tooth cosine rotor pump.At the same time,the outlet velocity and outlet flow rate were obtained.It was found that when there are more teeth,the outlet flow will decrease,but the flow will become more stable.Finally,expanding the analysis of the mechanical properties of the cosine rotor pump.since there is no real contact between the two cosine rotors,the radial force of the cosine rotor pump is the liquid pressure when it working.According to the traditional analysis method,the expression of the liquid pressure of the cosine rotor pump can be calculated,and it was found that the liquid pressure load direction pointed to the suction cavity.Based on the expression of the liquid pressure,the influential regularity of the main performance parameters of the cosine rotor on the liquid pressure can be investigated,and analyzing the influence of different area utilization coefficients on the liquid pressure.The statics and modal analysis of the rotor shaft are analyzed by using ANSYS Workbench,and getting the deformation neographs and the first six modes of vibration of the rotor shaft,which provide a theoretical basis for the gap between the two rotors and resonant prevention.