| Scroll compressor is widely used in the fields of small refrigeration,machinery,food,medicine,petrochemical,power engineering and so on because of its high efficiency,low noise and compact structure.Due to the special motion form and force characteristics of scroll compressor,there are radial leakage and tangential leakage in the compression chamber,which greatly reduces the efficiency of scroll compressor and becomes one of the main factors hindering its development.The orbiting scroll is one of the most important components in the rotor system of the scroll compressor,and the overturning moment on the orbiting scroll causes the orbiting scroll to overturn,which directly affects the stability of the rotor system and the tangential leakage of the scroll compressor,therefore,In this paper,the model of scroll compressor is taken as the research object,and the overturning and tangential leakage of orbiting scroll are taken as the research emphasis,based on the basic theory of scroll compressor,the overturning law and tangential leakage of orbiting scroll under overturning moment are studied by using virtual prototype modeling technology,multi-body dynamics simulation technology and Fluent numerical simulation technology.First of all,the force and moment of the parts in the scroll compressor are analyzed,especially the gas force and moment of the orbiting scroll.The force balance equation is established,and the forces of the orbiting scroll and the needle bearing are analyzed under the overturning state.The dynamics theoretical model of the scroll compressor rotor system is established under the ideal condition and the condition with the movement pair clearance.Secondly,the model of scroll compressor is established by Solidworks and UG12.0,and the dynamic model of scroll compressor with clearance and different tooth height is established by ADAMS,which considers the overturning moment of orbiting scroll.The clearance has a positive correlation with the overturning of the orbiting scroll,and the tooth height has an effect on the orbiting scroll vibration during the starting and accelerating stage of the compressor;The change range of crank angle corresponding to the most serious eccentric wear and tangential leakage area of friction pair under the influence of clearance is determined;It is found that the tooth height is the main factor affecting the maximum displacement of the orbiting scroll,and the clearance is the main factor affecting the maximum velocity of the orbiting scroll.The research results can provide important theoretical support for the structure optimization design of scroll compressor and the research of tangential leakage under the overturning characteristics of orbiting scroll.Finally,the physical model of inclined compression chamber and the mathematical model of tangential leakage are established,the calculation formula of tangential leakage area is modified,and the tangential leakage is calculated theoretically;At the same time,Fluent software is used to analyze the flow field of a single inclined compression chamber and simulate the leakage.The effects of tooth height and clearance on the distribution of pressure field and velocity field and the leakage rate in a single inclined compression chamber are obtained.The consistency of numerical simulation and theoretical calculation results verified the physical model of inclined compression chamber and the mathematical model of leakage. |
