The Key Techniques Of Reciprocating Compressor Stepless Capacity Control System And Construction Of Engine Test Bed Research

This thesis is composed of two parts:The key techniques of reciprocating compressor stepless capacity control system(SCCS)and construction of engine test bed research.As the core equipment,reciprocating compressor is widely used in petroleum,chemical industry,machinery,metallurgy and other industries,as well as one of high energy consumption equipment.With the adjustment of production demand,the compressor cannot work under full load which resulting in huge energy waste.Therefore,the capacity control of the compressor becomes the focus of attention.Compared with other existing methods,the stepless capacity control system has the following advantages:high efficiency,continuous gas and significant effect.This thesis is a research studying on the key technology of SCCS and the system's influence on the compressor.Aero engine rotor has the characteristics of high speed,complex structure and high load.According to statistics,70%of aviation engine failures are caused by unbalanced rotor vibration.At present,research on dynamic balance is generally carried out at home and abroad using a simplified rotor dynamic balance system.However,dealing with high speed and multi-rotor thin-wall casing system,the actual balance effect is not ideal.It is difficult to achieve the ideal balance effect for the practical problems of the dynamic balance of motor rotor in the maintenance factory,which often cost a lot to disassemble the engine several times.Looking through the development process of aviation in developed countries,the test bench is an important cornerstone for promoting engine technology progress and exploring scientific research problems.Based on the present development of engine technology,this paper set up a test bed for vacuum full speed electric drive engine.The main research contents of this paper are as follows:(1)Designed a stable and reliable hydraulic system for the requirements of the composition principle and the actuator's control actions of SCCS;Through AMESim simulation method,the key parameters of hydraulic system oil supply pressure,pipeline length and oil station backpressure are simulated and analyzed,and the optimal design parameters are summarized.Through hydraulic system performance test,verified the validity of the dynamic response simulation;concluded oil supply pressure and system load,gear pump flow,the change of the relationship between the oil temperature which conclude the hydraulic system working characteristic and provide clear guidance for field application.(2)Based on the analysis and calculation of the possible influence of SCCS on the compressor during the implementation process,the effect of different capacity adjustment methods on the reverse angle of the compressor is summarized.By using multi-body dynamics simulation software RecurDyn to simulate the motion mechanism of the compressor,analyzed the influence of the Flexible body motion mechanism of modeling,summarized the compressor motion mechanism under various load.All provided technical support for SCCS application promotion at the scene and as well as reference basis is provided to load the reciprocating compressor fault diagnosis of SCCS.(3)Aiming at the research on the problem of dynamic balance,designed the principle and the overall design framework of the test bed for vacuum full speed electric drive engine.And analyzed the test bed construction including engine reforming,driving system,vacuum system,lubricating oil system,test bench and so on.Completed the design and selection of vacuum system and the design,selection and manufacture of the lubricating oil system.Planned and designed the overall layout of the laboratory,and carried out the smooth implementation of the construction project,which laid a solid foundation for the research of dynamic balance test.