Research On The Leakage Model Under Capsizing Of Scroll Compression Maneuvering Scroll Disk

As a new type of highly efficient fluid machinery,scroll compressor is widely used in petrochemical industry,low temperature refrigeration and other fields.Compared with other rotary compressors,it has the advantages of reliable operation,energy saving and high efficiency.With the emergence of emerging technologies driving the development of emerging industries,the application of scroll machinery will become more and more common.The reliability of the scroll compressor depends to a great extent on the stability of the rotor system.As one of the most important components of the rotor system,the movable scroll has a direct impact on the quality of the rotor system's dynamic characteristics.In this paper,the horizontal natural gas compressor is taken as the research object,considering the overturning of the movable scroll under the action of gas force,and the rotor system model under different gaps is simulated and analyzed.In order to study the effect of the gap size on the leakage change of scroll compressors,the model of the leakage cavity under different gaps was established using theoretical modeling.Using the method of numerical simulation,the changes of radial leakage and tangential leakage of a single leakage cavity are analyzed and studied.Firstly,theoretical research is carried out on the overturning model of the rotor system under the overturning of the movable scroll.According to the geometric design parameters of the scroll compressor,Solidworks is used to analyze the gap vector model of the rotor system,and the rotor system models under different gaps are established.Secondly,on the basis of the three-dimensional solid model with clearance,the rotor system dynamics model was established in the virtual prototype software ADAMS,and the motion simulation and the rigid-flexible coupling simulation simulation were carried out.The inclination angle of the scroll of the scroll compressor with one revolution of the crankshaft under the action of gas force is obtained.The simulation results show that: at a fixed gap value,the maximum inclination angle occurs within the range of 313.2 °~ 330.6 °in the spindle cycle.The gap has no effect on the displacement of the center of mass of the movable scroll under overturning,but it will increase the vibration of the movable scroll;Flexibility has no effect on the displacement of the center of mass of the scroll scroll of the scroll compressor,but the maximum value of the radial direction of the center of mass displacement in the flexible body of the scroll during the period is 3.17 times under the rigid condition,which intensifies the overturning of the scroll and reduces thevortex.The service life of the scroll compressor.The research results provide a theoretical basis for reducing the change in the leakage of the scroll compressor and optimizing the structure.Finally,for the problem of the change of the gap value in different directions in the case of the scroll compressor overturning,the leakage model of a single compression chamber under different gaps is established by controlling the value of a single variable,and the Fluent numerical simulation software is used to obtain the values of different gap values.The distribution law of the velocity vector field and pressure vector field of the compression cavity is analyzed,and the experimental results of different models are analyzed and compared.The results show that the axial gap is the main reason for radial leakage,and the radial gap is the main reason for tangential leakage,which is in accordance with the normal law of movable scroll leakage.The comparative analysis found that when the movable scroll overturns,the effect on tangential leakage is more obvious than radial leakage.