Analysis And Optimization Of Output Characteristics Of Ultra-high Pressure Radial Piston Pump

As the manufacturing industry accelerates towards high-end,machinery and equipment put forward higher requirements for hydraulic power.As the core component of mechanical equipment,the ultra-high pressure radial piston pump is the "heart" of the ultra-high pressure hydraulic system,which directly determines the working characteristics of the hydraulic system.Due to the existence of ultra-high pressure,high power,high reliability and other harsh requirements,high-performance ultra-high pressure radial piston pumps are mostly monopolized by foreign companies,becoming one of the "stuck neck" problems in China’s machinery and equipment manufacturing industry.Therefore,this paper takes the 60 MPa ultra-high pressure radial piston pump as an example to model,studies the kinetic characteristics of the plunger pair under the ultra-high pressure condition,analyzes the opening and closing hysteresis law of the valve core under the ultra-high pressure condition,establishes the output pressure and flow model of the ultra-high pressure plunger pump and analyzes its output characteristics,builds an experimental platform to verify the theoretical analysis and results,and finally,optimizes the key parameters of the distribution valve,suppresses pulsation,improves the volumetric efficiency,and optimizes the output characteristics of the ultra-high pressure plunger pump.Research includes:(1)Analyze the kinetic characteristics of ultra-high pressure plunger pair and establish its flow leakage model.Considering the high-pressure deformation of the plunger pair and the eccentricity of the cam,the kinetic analysis of the plunger and the plunger pair was carried out,and the plunger offset and tilt changes under the overpressure condition were obtained by the least squares iteration method.The influence of pressure on oil properties was analyzed,and the ultra-high pressure plunger secondary leakage model was established and solved by the variable step length Rungekuta method.Obtain ultra-high pressure plunger pair leakage flow at60 MPa.The leakage flow rate of the proposed model is basically consistent with the experimental data.(2)Study the distribution characteristics of ultra-high pressure radial piston pump and establish the output model.The structural composition and working principle of the distribution valve were analyzed,and the dynamic analysis of the valve core under ultra-high pressure working conditions was carried out to obtain the opening and closing hysteresis law of the valve core of the distribution valve under ultra-high pressure.A distribution model considering the hysteresis effect of valve core opening and closing was established,and the output pressure and flow model of ultra-high pressure plunger pump were obtained by combining the ultra-high pressure plunger secondary leakage model,and the output characteristics of ultra-high pressure plunger pump under different plunger numbers,different speeds and different pressures were analyzed.(3)An experimental platform was built with a 60 MPa ultra-high pressure radial piston pump as the research object to test the output pressure and flow characteristics of the piston pump under different pressures and different speeds.The results show that the pressure increases,the amplitude of pump output pressure pulsation increases,and the volumetric efficiency decreases.The speed increases,the pressure and flow rate output of the pump increase,and the volumetric efficiency decreases slightly.Verify the rationality of theoretical analysis and mathematical model.(4)Optimize the key parameters of the distribution valve,suppress pressure pulsation,and optimize the output characteristics of ultra-high pressure radial piston pump.An AMEsim simulation model of ultra-high pressure piston pump was constructed,the influence of various parameters of the distribution valve on the pump output pressure and the opening and closing of the valve core was analyzed,and the parameter optimization model of the distribution valve based on NLPQL algorithm and GA algorithm was designed,and the pressure pulsation after optimization was reduced by 14.9%.Effectively suppress the pressure pulsation of the output of the plunger pump under ultra-high pressure conditions.