Research On Design Principle Of New Pump-motor Integrated Energy Recovery Device

At present,in the fields of elevators,forklift trucks,excavators,reverse osmosis seawater desalination,petroleum,natural gas processing,metallurgical coal,chemical fertilizer synthetic ammonia,sewage treatment,a large amount of energy is directly discharged and wasted.In order to recover and reuse the energy,improve energy utilization efficiency,alleviate the crisis of energy shortage,energy recovery devices came into being and have been widely used.There are four main types of recovery which contain pump-motor type,hydraulic turbine type,piston type and rotor type.With the development of industry,more efficient,reliable,miniaturized,integrated energy recovery devices are required.Therefore,the innovative energy-saving device with more efficient and integrated design has important research significance and scientific value.Firstly,through the discussion and comparison of the mechanical connection and functional integration pump-motor energy recovery technology,the energy recovery efficiency of the two is obtained,and the performance evaluation index of pump-motor energy recovery device is given.Then based on functional integration recovery technology,a new pump-motor integrated device is designed,subsequently the structural design theory of main innovative parts which obtain swashplate mechanism,return plate,cylinder block,distribution plate and oil-passing shell and a scientific description of detailed working process of the device are provided.Secondly,the dynamics and kinematics model of the new pump-motor energy recovery device is completely established,and the structural and dimensional parameters of key components are designed through the force model,empirical parameters and optimization functions.And based on the kinematics and dynamics model,the key friction pair characteristics are studied.Mainly by studying the influence of the piston pair structure on its force,specific pressure and specific power,it is concluded that the friction and wear condition of the short contact piston pair structure is improved compared with that of the long contact structure.Then the length of the piston cylinder sleeve is optimized based on the force variation law of the piston pair.In addition,the leakage model of the piston pair is establisned to obtain the leakage rule and volume loss,and in combination with process property the reasonable radius clearance of the piston pair is designed.Subsequently,the ANSYS Workbench static analysis module is used to check the strength and stiffness of key components.The stress-strain and deformation law is found,the maximum stress-strain and deformation results are analyzed to verify the preliminary structural size parameters and to provide experience and reference for future device structure optimization.Finally,the principle test-bed of pump-motor energy recovery technology which is applied in the throttling speed control circuit is built to verify the feasibility of the recovery technology as a new type of hydraulic power source,which can provide some reference for the research and application of the new device.