The Effect Of Kinematic Pair Clearance On Tangential Leakage Gap Of Scroll Compressor

The scroll compressor is a new type of positive displacement compressor.Compared with the traditional type compressor,it has the characteristics of high efficiency,low vibration,low noise,simple and compact structure,stable operation and good reliability.The main components of scroll compressors are composed of orbiting scrolls,fixed scrolls,crankshafts,anti-rotation mechanisms,support bodies,and counterweights.In an ideal working state,orbiting scrolls perform translational translational motion and vortexing.The disks mesh with each other to achieve compression of the gaseous medium.However,due to the dimensional error of the manufacturing process,the existence of the auxiliary clearance and the wear clearance,the scroll compressor is in a non-ideal motion state.At this point,the orbiting scroll will generate autorotation,which will change the tangential leakage gap of the orbiting vortex,resulting in a change in the tangential leakage of the compression fluid.Therefore,based on the principle of mechanics,this paper simplifies the parallel four-bar mechanism model and uses the continuous contact model.Based on the theoretical analysis of the multi-component and multi-degree-of-freedom gapless mechanism,a gap rod model is established to analyze the motion pair clearance to the dynamic and stationary vortex.The influence of the tangential leakage gap of the tooth can be used as reference for engineering problems in the optimization design of scroll compressor anti-rotation mechanism scroll compressors and improvement of compressor performance.According to the theoretical basis of the scroll body profile of the scroll compressor,a corresponding theoretical model is established for the geometric characteristics and mechanism of the three pairs of compression chambers of the scroll compressor,and the corresponding volume calculation formulae of the compression chamber are given respectively;based on the vortex The geometrical characteristics of the scroll vortex line of the compressor are used to calculate the coordinate expressions of the vortex line and the center of gravity of the vortex,and the vortex is analyzed and calculated according to the leakage form of the gas medium when the moving and stationary scrolls mesh with each other.The length of the leakline in the two leakage forms of the compressor;The force model of the orbiting scroll is established,and the various forces acting on the scroll are analyzed and calculated,and the expression of each gas force is given.At the same time,a comparative systematic mechanical analysis of the mutual forces between the orbiting scroll and its anti-rotation mechanism,the Oldham slip ring,is presented.Both the orbiting scroll and the cross ring slip ring are listed separately.The balance equation of force and moment is the theoretical guidance for the study of the force of the scroll compressor and the anti-rotation mechanism during normal operation of the scroll compressor.According to the structure of the crank pin anti-rotation mechanism of an oil-free lubrication scroll compressor,a mechanism model corresponding to the structure is established;from the perspective of the working principle of the crank pin anti-rotation mechanism,the analysis is based on kinematics and mechanism principles.The force of the crank pin is self-rotating,and the equation of motion balance of the anti-rotation crank pin is established;the working principle of the crank pin anti-rotation mechanism is analyzed;the anti-rotation mechanism of the crank pin is reduced to a parallel four-bar linkage mechanism;the number of anti-rotation crank pins is determined.Reasonable choices and their relative distribution.Aiming at the tangential leakage problem caused by the clearance gap of the scroll compressor of the crank pin anti-rotation mechanism,a parallel four-bar linkage model based on the principle of mechanics is used to convert the mechanism with clearance into an equivalent gapless model using the continuous contact model.Institutions carry out research,and use MATLAB numerical analysis software and ADAMS dynamics simulation software to obtain the effect of gap value on crank vortex autorotation angle and tangential leakage gap.The results obtained by the two methods are compared and studied to obtain the effect of the gap at the crank pin of the rotor on the rotation and tangential leakage of the movable scroll.