Profile Design And Multi-rigid-flex Coupling Analysis Of Rotary Vane Compressor

As the core device of the car,the air-conditioning system can provide a comfortable driving environment and reduce the fatigue strength of the driver.The compressor is the heart of the refrigeration system.The rotary vane compressor is a new type of rotary compressor with the advantages of fewer parts,high speed,high efficiency,and low cost.It is widely used in small and medium displacement automobile air conditioning systems.In the actual working process,the compressor rotor runs at high speed.The contact and impact of the blade and the rotor slot,the blade and the cylinder body can easily induce vibration of the body,which causes the external field radiation noise and affects the comfort of the car;the shape line of the blade and the cylinder,and the gap between the blade and the rotor The contact impact,wear and tear of the compressor will also affect the life and compression efficiency of the compressor.Therefore,the development of the cylinder block profile design and dynamic contact excitation research of the rotary vane compressor is important to clarify the dynamic contact excitation mechanism of the rotary vane compressor blade and the cylinder,reduce compressor vibration and noise,and improve compressor life and compression efficiency.The theoretical significance and practical engineering application value.This paper takes the rotary vane compressor as the research object,establishes the mathematical analysis model of the blade and cylinder shape and the numerical model of the compressor multi-rigid body kinematics,studies the influence of the blade offset and the number of blades on the blade kinematics,and reveals the blade motion mechanism Furthermore,based on the theory of rigid-flexible coupling dynamics,a multi-rigidflexible coupling dynamics model of the flexible blade,rigid rotor and cylinder block of the rotary vane compressor is established,and the pressure test data of the primitive cavity is coupled to the flexible blade,The back pressure cavity pressure is applied to the back of the blade as a mechanical boundary condition to study the dynamic characteristics of the multi-rigid-flexible coupling of the rotary vane compressor;then,on the basis of the original simple harmonic-circular arc curve of the cylinder block profile,based on the isometric curve envelope Principle,derive and calculate the new cylinder block profile,study the compressor performance indicators such as the kinematics,dynamic characteristics and volumetric efficiency of the new compressor blades;finally,start from the two aspects of working condition parameters and structural parameters,and study the rotary vane The dynamic characteristics of the compressor under different parameters such as rotor speed,back pressure and number of blades,blade offset and blade head structure.The main research contents are as follows:(1)Based on the equidistant curve envelope principle,establish a mathematical model of the blade and cylinder profile of the rotary vane compressor,derive and calculate the correlation law of blade displacement,speed and rotor angle,and compare it with the numerical solution of multi-rigid body kinematics to verify The rationality of the model,and study the influence of blade offset and number of blades on blade kinematics;(2)Based on the theory of rigid-flexible coupling dynamics,a multi-rigid-flexible coupling dynamics model of the flexible blade,rigid rotor and cylinder of the rotary vane compressor is established,and the pressure test data of the primitive cavity is coupled to the flexible blade,The back pressure cavity pressure is applied to the back of the blade as a mechanical boundary condition,to study the dynamic characteristics of the multi-rigidflexible coupling of the rotary vane compressor,and to clarify the compressor dynamic contact excitation mechanism;(3)Based on the cylinder profile of the original simple harmonic-arc curve,based on the principle of equidistant curve envelope,the trajectory curve of the arc center movement of the blade head is regarded as the cylinder profile,and the lift curve speed is set,The acceleration is zero at the start and end points of the arc curve,derive and calculate the new cylinder block profile,and study the kinematics,dynamics characteristics and volumetric efficiency of the new compressor blades;(4)Based on the multi-rigid-flexible coupling dynamics model of the rotary vane compressor,the influence of working conditions and structural parameters on the dynamic contact excitation of the compressor is studied,and the rotor speed,back pressure and number of blades of the rotary vane compressor are revealed.The correlation between parameters such as offset and blade head structure and compressor dynamic contact excitation.