Analysis Of Key Components Of Diaphragm Compressor

Diaphragm compressor is a special type of reciprocating compressor,which compresses gas through high-speed vibration of diaphragm to obtain clean and pollution-free high-pressure gas.According to this advantage,it is widely used in petroleum,chemical,military and other industries.Crankshaft diaphragm compressor needs to be subjected to various alternating loads in the working process,and it is the most complicated component in the whole equipment.The reliability of diaphragm compressor can be effectively improved by avoiding the resonance of crankshaft in the working process,accurately obtaining the position of dangerous load of crankshaft and improving the design structure of crankshaft in time.The dynamic characteristic analysis of crankshaft is based on finite element method and multi-body dynamics,and the working process of crankshaft is simulated and analyzed by computer technology.First of all,the research focus of this paper is the crankshaft connecting rod mechanism in diaphragm compressor.In the early stage of the research,the working principle of diaphragm compressor is known by referring to the related data of reciprocating compressors at home and abroad.According to its working principle,the motion state and statics of mechanical shafting in the whole system are studied,and the motion characteristics and stress law of crankshaft are mastered,which provides theoretical basis for the dynamic characteristics analysis of crankshaft in the following chapters.Secondly,using ANSYS Workbench software,the free mode and constrained mode of the crankshaft in the unconstrained state are analyzed,and the corresponding frequencies and vibration modes of the two modes are obtained.The critical speed of the crankshaft is analyzed.According to the critical speed data,the crankshaft will not resonate in the constrained mode.Thirdly,the finite element simulation of crankshaft is carried out by using ANSYS Workbench,and a cycle of response analysis and calculation of crankshaft is carried out to find out the most concentrated part of internal stress,and the safety of this dangerous part is checked.Through simulation analysis,it is found that their calculated fatigue strength exceeds the allowable strength and meets the safety requirements.Finally,ADAMS simulation software is used to dynamically simulate the crankshaft and the connecting rod mechanism,and a cycle of dynamic analysis of the crankshaft connecting rod mechanism is carried out,so as to obtain the stress situation of the main shaft diameter and crank pin when the crankshaft becomes rigid.Then the crankshaft is made flexible,and a rigid-flexible coupling model is formed.Finally,the dynamic simulation analysis of the crankshaft connecting rod mechanism is carried out,and finally the load of the crankshaft,bearing and crank pin after flexible treatment is obtained.According to the above research,the dynamic simulation of the crankshaft connecting rod mechanism can know in detail the stress change in the stress concentration area of the mechanism in the working process,and provide a reference for the later optimization design and the strength calculation after optimization.