Vibration Characteristics And Experimental Study On Reed Valve Of Rotary Vane Compressor

Rotary vane compressors have the advantages of high compression ratio,good adaptability to working fluids,small size,light weight,fewer parts,and simple manufacturing and maintenance.They are widely used in automotive air conditioning systems.As a key component of the rotary vane compressor,the exhaust structure is mainly composed of the valve seat on the cylinder block,the reed valve plate,and the lift limiter.Its periodic high-speed operation discharges the compressed high-temperature and high-pressure working fluid.In the exhaust process,due to the complex and changeable exhaust service conditions and multiple excitation sources,fluid pulsation and valve flap flutter show a strong coupling effect,and valve exhaust noise is particularly prominent,which seriously affects the acoustic quality of automobile air-conditioning compressors.Therefore,it has important theoretical significance and engineering practical value to carry out the vibration characteristics and experimental research of the reed valve plate of the rotary vane compressor.This paper takes the exhaust structure of a rotary vane compressor as the research object,establishes a single particle model of the reed valve plate,builds an reed valve plate opening measurement test bench,and studies the effect of exhaust working conditions and geometric parameters on the dynamic characteristics of the valve plate.Reveal the movement mechanism of the reed valve plate;then,based on the improved valve plate structure parameters,the reed valve plate cantilever model,the exhaust structure and fluid two-way fluid-solid coupling model,and the exhaust structure broadband noise prediction model were established to study the exhaust The kinematics,dynamics and acoustic characteristics of the valve discs,with the help of the rotary vane compressor noise measurement test bench,verify the rationality of the improved reed valve structure design.The main research contents are as follows:(1)Based on the suction-compression-exhaust cycle state of the rotary vane compressor,comprehensively consider the characteristics of the reed valve plate and lift limiter before and after being wound,and regard the valve plate movement process as a single sizeless,single degree of freedom Without tilting and translational particles,establish the differential equation of single-particle valve motion,and use the fourth-order Runge-Kutta method to solve the valve motion law and reveal the exhaust motion mechanism of the rotary vane compressor;(2)Build an reed valve opening measurement system to verify the rationality of the single-mass valve motion model;then,based on the model,study the effect of geometric and motion parameters such as valve thickness,valve lift,and spindle speed on the exhaust structure Dynamic characteristics affect the law;furthermore,improve the single-curvature linear lift limiter profile;(3)Establish the analytical model and finite element model of the cantilever beam of the reed valve plate to obtain the natural frequency and mode shape of the valve plate;then,comprehensively considering the coupling effect of the fluid area and the solid area,an improved rear row is established based on the dynamic grid Two-way fluid-solid coupling model of gas structure to study the dynamic characteristics of the flow field of the reed valve plate;(4)Based on the two-way fluid-structure coupling turbulence parameters,with the help of the semi-empirical correction formula of the source term of the Lilley equation,a broadband noise model of the reed valve plate was established to study the noise distribution of the reed valve plate;then,a noise test platform for the rotary vane compressor was built,Test the noise before and after the improved exhaust structure to verify the effectiveness of the improved structure on exhaust noise control.