Structure Improvement And Process Research Of Non-oil-immersed Air Gap Type Hydraulic Motor Pump

Noise and vibration reduction of hydraulic power source is the key of silent hydraulic technology.Noise reduction space of hydraulic pump itself is not large at present.Starting from the integration of motor and hydraulic pump,it becomes an important way to achieve a large noise reduction.Although domestic hydraulic motor pump has been studied for many years,it still stays at the level of prototype manufacturing.The research of hydraulic motor vane pump has undergone ten years of accumulation and continuous optimization and improvement.It is necessary to push it to the market and form independent knowledge products.This topic is devoted to changing the patent of non-oil-immersed air gap hydraulic motor vane pump into a product.The motor pump avoids the energy loss caused by oil agitation by the rotor of the oil-immersed hydraulic motor pump,thereby improving the total efficiency of the hydraulic motor pump.This paper aims to provide a theoretical basis and technical support for the production and manufacture of non-oil-immersed air gap hydraulic motor vane pump products(hereinafter referred to as motor pump).Aiming at the shortcomings of motor pump structure,the improvement design was carried out,and the basic structure of the central shaft,shell and pump core seat was determined.The strength of the improved pump core seat was checked and analyzed,and the processing technology was selected for its special structure.The simulation analysis was carried out for the flow channels of different structure forms,and the optimal structure of the flow channel was selected as the oil passage and heat dissipation flow of motor pump.According to the motor performance required by the main pump of motor pump,the basic design technical parameters of the motor for driving the main pump are calculated.The air gap length and iron core length between stator and rotor are parameterized and optimized by RMxprt module,and the optimal air gap length and iron core length of the motor are determined.The two-dimensional transient field of the motor is simulated by finite element method using Ansoft Maxwell software.The starting characteristics,magnetic field distribution,magnetic density distribution and loss of the driving motor and the standard motor under no-load condition are compared and analyzed.The operation efficiency of the driving motor is calculated and the rationality of the motor design is verified.The assembly of motor pump rotor assembly adopts hot-sleeve technology,and accurately calculates the heating temperature of cast aluminium rotor when hot-sleeve is used.The influence of the increase of the axial length of cast aluminium rotor core after heating on the performance of motor pump is theoretically analyzed.The setting of correcting surface and supporting surface of motor pump rotor is completed,and the allowable unbalance of two correcting planes is calculated accurately,which is passed on the dynamic balancing machine.The dynamic balance of motor pump rotor is corrected by the method of weighting and de-weighting.According to the special structure of motor pump,the selection of speed sensor and the design of the measured body are completed,the overall scheme of motor pump speed measurement is determined,the performance test system of motor pump is designed,and the installation arrangement of each component is completed by using three-dimensional design software.The integrated blocks of the loading system and the sensor installed at the entrance of motor pump are designed.Finally,the integrated blocks of the sensor installed in the loading system and the motor pump entrance are designed.The scheme of motor pump performance test is determined.