Design And Application Of Pneumatic Strain Energy Accumulator

As one of the widely used energy sources in the industry field,compressed air is widely used in automobile manufacturing,electronics,semiconductor manufacturing and other industries because of its rapid response,high efficiency,safety,low cost and other advantages.Due to the compressibility and leakage of compressed air,the utilization rate of compressed air is very low.Therefore,improving the utilization rate of compressed air is of great significance to environmental protection and energy-saving.Aiming at the problem of the traditional gas storage tank cannot charge/discharge energy at constant pressure,which will lead to unstable operation and secondary waste of energy when it is used in the exhaust recovery energy-saving circuit,a new type of Pneumatic strain energy accumulator based on super elastic rubber material is proposed in this paper,which can charge/discharge energy at constant pressure and be applied to the exhaust recovery energy-saving circuit to achieve the purpose of energy-saving.The main contents of this paper are as follows:(1)Based on the rubber airbag energy storage components,the structure design of pneumatic strain energy accumulator is carried out,mainly including the processing,connection mode and seal design of each component.Based on the hyperelastic property of rubber material,the principle of constant pressure energy storage of Pneumatic strain energy accumulator is explained,and the constant pressure property of inflation expansion of Pneumatic strain energy accumulator is verified by finite element simulation software Abaqus.(2)The influence factors of peak pressure,expansion pressure and contraction pressure of Pneumatic strain energy accumulator are analyzed.Based on the energy analysis method of the first law of thermodynamics and the enthalpy analysis method of the second law of thermodynamics,a mathematical model describing the charging/discharging energy storage efficiency of the accumulator is established.(3)The charging/discharging experimental platform is built to analyze the energy storage efficiency.The acquisition control program is designed by using Simulink software to collect the gas flow,temperature and pressure entering the pneumatic strain energy accumulator during the charging/discharging process to calculate the energy storage efficiency.Based on the uncertainty method,the changes of expansion pressure,contraction pressure and energy storage efficiency of rubber and latex airbags after cyclic inflation and deflation were analyzed,and the stability of mechanical properties of rubber and latex airbags after cyclic inflation and deflation was determined.(4)The energy-saving application verification of pneumatic strain energy accumulator is carried out.The exhaust energy-saving circuit based on pneumatic strain energy accumulator is built,the mathematical model of energy-saving efficiency is established,and the sensitivity analysis of influencing factors of energy-saving efficiency is carried out.The energy-saving efficiency range of pneumatic strain energy accumulator and its influence on the loop operation stability is verified.The results show that the standard deviations of expansion pressure,contraction pressure and energy storage efficiency are 0.5%,0.4%and 0.584%,respectively.the energy storage efficiency is about 76.9%and the energy density is 309.48 k J/m~3,which indicate that the pneumatic strain energy accumulator can store/release energy with high energy storage efficiency and energy density.The maximum energy-saving efficiency is 54.1%when it is applied to the pneumatic circuit for exhaust recovery,and the stability of the cylinder operation is improved compared with the traditional circuit.The results show that it is feasible to replace the traditional air storage tank with pneumatic strain energy accumulator to improve the use efficiency of compressed air.