Structural Design And Research Of Resonators Based On Sound Pressure Sealing

As an important component of mechanical systems,sealing devices are widely used in various industrial equipment and can effectively prevent leakage.As a new type of sealing device,sound pressure sealing utilizes the high pressure amplitude in the resonant cavity to hinder fluid leakage.The existing sound pressure sealing devices are mostly cylindrical resonator structures,and when the size is small,the pressure amplitude generated is smaller,resulting in a reduced sealing effect.Therefore,this article designs a small-sized ring resonator and compares it with existing cylindrical resonators,compares the pressure amplitude inside the cavity,and analyzes the influencing factors of the pressure amplitude inside the ring resonator.The main research content is as follows:A theoretical analysis was conducted on the pressure amplitude of a piston driven variable cross-section resonant tube.By using the control equation in the ideal state,the asymptotic expansion method was used to obtain the resonant mode frequency expression of the variable cross-section resonant tube.Combined with the state equation,the approximate expression of the dimensionless pressure in the resonant cavity was solved.The obtained resonant frequency is used as the driving frequency to excite the resonant tube,and the pressure amplitude inside the cavity of different tube types in closed and open states is compared and analyzed.The optimal tube type that can enhance the pressure amplitude is obtained.Establish a ring resonator model.In order to enhance the pressure amplitude of a small size sound pressure sealing structure,a conical resonant cavity model is rotated around the axis once to establish the ring resonator model that needs to be studied.Theoretical analysis of the approximate analytical expressions for the resonant frequency and pressure amplitude of the resonator in an open state.Comparing the resonant frequency obtained from theoretical analysis with the resonant frequency calculated from simulation,it was found that the two results were similar,indicating the accuracy of the theoretical analysis.Compare and analyze the pressure amplitude in the two resonant cavities of a conical resonator and a ring resonator when the driving frequency and driving intensity are different.The results showed that in the case of smaller sizes,the pressure amplitude in the annular resonant cavity was much higher than that in the conical resonant cavity under different driving intensities when reaching the resonant frequency.This indicates that in smaller sizes,the annular resonant cavity can generate larger pressure amplitudes,which can effectively enhance sealing performance.Study the factors affecting the pressure amplitude in the ring resonant cavity.The factors that affect the pressure amplitude in the resonant cavity mainly include the material of the resonant cavity,environmental temperature,the size of the resonant cavity opening,and the inclination of the end face.By controlling other conditions to remain unchanged and using different materials to establish a resonant cavity model,the calculation results show that the pressure amplitude of the resonant cavity composed of different materials will also vary.Among them,when the material is copper,the pressure amplitude of the resonant cavity is the highest.Analyzing the ambient temperature,the amplitude of pressure inside the cavity shows a trend of first increasing and then decreasing with the increase of temperature.Analyze the ratio of opening height to shaft diameter and the influence of end face inclination on pressure amplitude.Through independent analysis and cross experimental analysis,it can be concluded that when the end face inclination remains unchanged,the ratio is increased by simultaneously increasing the opening height and shaft diameter.The larger the ratio,the smaller the pressure amplitude;Keeping the ratio constant,the opening height and shaft diameter constant,increasing the inclination of the end face,and increasing the pressure amplitude.Build an experimental platform to verify the reliability of simulation calculations.To verify the reliability of simulation and simplify the experiment,a conical resonator model was used to construct the experiment,and the resonant frequency and pressure amplitude of the resonator were measured in an open state.By processing the data and comparing it with the simulation results,it was found that the two results were similar,indicating the reliability of the simulation calculation.