Application Of Coupling Between Hydraulic Accumulator And Flywheel Energy Storage System

The purpose of this study is to improve the energy recovery efficiency and energy density,improve the low energy density of ordinary accumulator,which is important for the development trend of large-scale and miniaturized construction machinery,and save considerable space while recovering energy.The physical simulation model of hydraulic flywheel accumulator and four port axial piston pump is built by AMESim,and the related hydraulic circuit is built by combining the lifting of heavy object and the lifting of boom of hydraulic excavator,and the differential equation of displacement and moving speed of variable pump is obtained.The energy density and energy recovery effect of the hydraulic flywheel accumulator are further analyzed by matching the parameters of specific working conditions.First of all,the hydraulic flywheel accumulator system based on four port pump is applied to the new elevator safety protection system,and the related overall design scheme of energy recovery is proposed.The stability of the hydraulic flywheel accumulator is tested,and the comfort of the elevator is still maintained during the braking and starting process of the elevator.The new elevator safety protection system can not only play a smooth and non polar buffering role when the elevator falls,but also protect the personal safety.At the same time,it can avoid vibration and eliminate the fear of the elevator falling in the car.Secondly,it is also applied to the excavator working condition,using the equivalent gravity potential energy,the simulation assumption is made,which has certain rationality.The working performance of the hydraulic flywheel accumulator is tested.The energy density of the hydraulic flywheel accumulator is high,and more energy can be stored in the same space.Through AMESim simulation,the energy recovery is 80.1 k J,which is about 3.22W·h/kg after conversion in mode 2,which is 89.4% higher than the energy density of ordinary hydraulic accumulator(1.7 W·h/kg),which makes up for the current range of energy storage power and charging and discharging time to a certain extent;in the application of new elevator,the energy density isincreased to 4.02 W·h/kg.The energy density of W·h/kg in the application of hydraulic excavator boom is 4.64 W·h/kg,which is about 2.73 times higher than that of ordinary hydraulic accumulator 1.7 W·h/kg.The simulation results show that compared with the ordinary hydraulic accumulator,the hydraulic flywheel accumulator with the same volume improves the energy storage density while taking into account the energy recovery efficiency;the differential equation is used to control the inclination angle of the pump swash plate and reduce the load jitters.