Flow Resistance Analysis And Stability Study Of The Pressure Compensation Device

Pressure compensation devices are used in submersible hydraulic systems to provide a submerged external hydraulic circuit exposed to seawater to provide a backpressure comparable to the ambient pressure and following environmental pressure changes to prevent intrusion of seawater.Submerged depth as an important indicator of submarine,the pressure compensation device proposed a larger range of voltage regulator requirements.The two key factors affecting the pressure regulating device's pressure regulating range are the flow resistance and the stability.The flow resistance determines the lower pressure regulating device's pressure regulating threshold,and the stability affects the upper pressure regulating device's pressure regulating limit.The subject studies the flow resistance and stability of the pressure compensation device through mathematical modeling,CFD simulation,AMESim simulation and experimental research.Based on the research results,the structural optimization,reducing the flow resistance of the device and increasing the stability of the device,so as to expand the pressure compensation Device pressure range.The main contents are as follows:In the first chapter,based on the application environment of pressure compensation device and the proposed background of the subject,this paper briefly introduces the research status of pressure compensation device and the research on the performance of valve components,and expounds the research significance and research content.In the second chapter,based on the working principle of the research object,the pressure compensating devices are respectively mathematically modeled under the decompression working condition and the overflow working condition,the static and dynamic characteristics are analyzed,and the pressure compensation device is qualitatively deduced to have the cracking pressure Of the reasons,and contribute to enhance the stability of the output pressure of the device.In the third chapter,a three-dimensional model of the main runner of the pressure compensation device is established.The appropriate turbulence model is selected and the CFD numerical simulation is carried out by the finite element method.The structural factors that affect the flow resistance of the pressure compensation valve are analyzed,and the structural optimization scheme is obtained.Based on the simulation results,the valve's flow resistance will be reduced by 69%after structural optimization.In the fourth chapter,the AMESim model of pressure compensation device is established.The preliminary simulation results in the relatively unstable condition of the system and the simulation route.According to the simulation route,the influence on the control stability of the system is simulated based on the friction force of the valve core,the dynamic cavity size of the control port,the volume of the pilot valve,the volume of the pilot valve,the size of the damper,the stiffness of the main valve spring,the hydrodynamic force and the pulsation of the system parameters the study.The fifth chapter,the pressure compensation device for the pilot study,the results of the previous study to verify the important components of the optimal parameters to be selected.After optimization,the minimum set pressure of the device under rated flow rate(150L/min)is reduced from 3.42MPa to 0.79MPa,a decrease of 77%,of which the minimum set pressure of the pressure compensation valve is only 0.55MPa;under the rated system pressure(12MPa),the upper limit of pressure regulation is increased from 4MPa to 5MPa.The sixth chapter summarizes the research content and conclusions of the full text and puts forward the prospect of future work.