| With the increasing demand of compressed air in military,chemical,automobile and other fields,the air compressor used to produce compressed air is developing towards small high pressure.Small high pressure air compressor is used to produce more than 10 MPa high pressure air compression machinery.High pressure means that the multistage compression,at the same time,there is still a requirement of displacement,and the current used to produce small high pressure air compressor use reed valve,more consistent,it is not easy to adjust the parameters and resistance to high pressure valves have apparently can not adapt to multistage compression valve at various levels shall have the difference,has limits on the performance of multistage compressor.Therefore,this paper replaced the original reed valve and improved the small high-pressure air compressor.Based on the improved scheme,a mathematical model was established,its characteristics were discussed and the feasibility of the scheme was verified.At the same time,optimization and research were carried out on the small high-pressure air compressor.The main research contents are as follows:According to the characteristics of the various type of air compressor,combined with the technical requirements of small high pressure air compressor,has chosen a level 4 ten swash plate cylinder piston type air compressor,optimized the layout of the plunger,at all levels on the cooling system,distribution flow system integration design,the valve can be changed to stiffness and prestressing quantity flexible adjustment of the traditional one-way valve.The single cylinder system mathematical model of swash plate air compressor was established considering the influence of valve characteristics in the working process,and the characteristic curve of swash plate air compressor with one-way valve was obtained by using the fourth-order Runge-Kutta method.By changing the speed and valve parameters,The influence law and influence degree of rotation speed,spring stiffness of inlet and outlet valves and preload on pressure pulsation and displacement of swash plate air compressor are obtained.By connecting the mathematical model of each level of cylinder with the mathematical model of interstage cooler and gas storage tank,the mathematical model of four-stage ten-cylinder working process of the whole machine is established,and the characteristic curve of four-stage ten-cylinder swash plate air compressor working process is obtained.The cylinder diameter was optimized based on the theory of thermodynamics,and the influence of adjusting the third and fourth cylinder diameters and only adjusting the fourth cylinder diameters on the distribution of compression ratio of air compressor at all levels was compared,and the distribution of compression ratio of air compressor at all levels was more reasonable by adjusting the fourth cylinder diameter.Particle swarm optimization algorithm was applied to optimize the speed and valve parameters of multistage swash plate air compressor.Firstly,the matching speed of each cylinder of multistage air compressor was optimized,and a unified speed was selected.Then,the optimal valve parameters of each cylinder were optimized.Finally,a single-stage experimental prototype was designed and processed,the components and components used in the experiment were selected and processed,the experimental scheme and measurement principle were drawn up,and the single-stage experimental platform was built,which made certain preparations for the subsequent single-stage air compressor characteristic verification experiment and multi-stage air compressor performance test experiment. |
