Structure Research On Noise Reduction Of Valve Plate Of Swash Plate Axial Piston Pump

Axial piston hydraulic pumps are the core power components in the hydraulic transmission systems of many large mechanical and electrical equipment and waterproof equipment.They are widely used in the construction machinery industry and are a major source of noise in the hydraulic system.At present,the country has more and more high requirements for environmental protection,and the hydraulic equipment has put forward increasingly strict requirements for the noise index of its supporting hydraulic components,so the vibration and noise reduction of axial piston pump is very urgent.Aiming at the problems of abnormal vibration of hydraulic components and pipelines and abnormal noise of the pump body when the speed of the 112 displacement swashplate axial piston pump produced by a company is above 1660r/min,the noise reduction structure of the valve plate is analyzed and optimized.Specific research contents are as follows:This paper introduces the research background of the subject and the harm of piston pump noise,so as to clarify the research purpose and significance of this paper;through combining with the research status of piston pump noise reduction at home and abroad,the main research contents and methods of this paper are formulated.The working principle and noise mechanism of piston pump are summarized.The key structural dimensions of valve plate are analyzed by mathematical modeling.According to the analysis results,the structure of valve plate is optimized.Based on the original structural parameters of the valve plate,the parameters of the valve plate are improved,and three kinds of noise reduction structural schemes of the valve plate are put forward,which are changing the envelop angle of the oil discharge hole in the high pressure area,changing the covering length of the oil sealing area of the valve plate,and changing the covering under a certain mismatch angle.The simulation model of pumplinx flow field of piston pump is established,and the characteristics of internal flow field of piston pump are analyzed by numerical simulation.The variation law of internal flow characteristics is obtained,and the pressure variation at the triangular groove of each port plate structure is analyzed.The noise and vibration test platform of swash plate axial piston pump is designed and built.The test principle,arrangement of measuring points and selection of sensors are considered,and the noise of piston pump is tested.According to the actual working conditions of the piston pump,the sound pressure test is carried out when the rotating speed is 1500 r / min,1560 r / min,1600 r /min,1660 r / min and 1900 r / min,and the displacement is 1 / 3 displacement,2 / 3 displacement and full displacement,and the variation law of the overall noise of the piston pump is obtained.The performance of axial piston pump with different noise reduction structure of valve plate is tested,and the volume efficiency and discharge rate of each valve plate structure are calculated and analyzed.Finally,the optimal structure scheme of noise reduction valve plate is obtained by comparing the experimental and simulation results.The dimension parameters of the piston pump studied in this paper under the optimal condition are the envelopment Angle of the oil outlet hole as the structural model 2,namely,the distribution of the envelopment Angle of the oil outlet hole is 40°,35° and 30°.The optimal scheme of covering amount is-0.3 when the supporting role is 0° wrong.After the addition of 5°wrong supporting parts,the optimal size of covering quantity is 0.