Research And Optimization On The Wear Performance Of Movable Scroll Plate Friction Pair Of Scroll Compressor Under Multi-speed Conditions

Oil-free scroll compressor,as a new generation of refrigeration compressor,has the advantages of simple and stable structure,low vibration,low noise,energy saving and environmental protection.It is widely used in the refrigeration industry.However,its unique structural design also leads to more friction pairs inside.The friction and wear of the scroll tooth end face of the dynamic and dynamic scroll disk have an important effect on the mechanical efficiency and running stability of the scroll compressor.In order to solve the problem of gas leakage caused by excessive surface wear in the process of scroll compressor,the friction pair composed of scroll tooth end face and static scroll plate chassis end face of a certain type of scroll compression motor scroll plate was studied.The wear change rule and wear mechanism of the vortex tooth end face of the scroll disk at different speeds were studied,and according to the dry friction condition,the lubrication medium at the clearance of the friction pair was changed to optimize the tribological performance of the end face friction pair.The main research contents are as follows:Firstly,a mechanical model was established to analyze the load variation on the end face of the scroll teeth during the operation of the scroll disk.Through finite element analysis,the dynamic contact stress change cloud map of vortex tooth end face at different speeds was obtained,the traditional Archard wear model was modified,and the wear depth at different speeds was calculated by finite element wear simulation,and the relationship between the wear depth and the number of wear was summarized.Secondly,the experimental bench of scroll compressor was built to carry out the end face wear experiment of scroll disk under different speed.The wear of the end face of the scroll disk is measured.The experimental results are compared with the simulation results to verify the correctness of the whole idea.After the end of the experiment,the wear area of the vortex disk was cut,and the wear morphology was observed by scanning electron microscopy,and the wear mechanism of the end face of the vortex disk was analyzed and summarized.Finally,the analysis of the wear mechanism of the end face of the dynamic vortex disc is used to propose an optimized solution for changing the lubricating medium of the end face friction substrate.A self-lubricating composite material of graphite,polytetrafluoroethylene（PTFE）and Mo S₂（molybdenum disulfide）filled polyether ether ketone（PEEK）was prepared,and C-Mo S₂-PTFE-PEEK coating was prepared on the surface of 4032 aluminum alloy substrate by thermal spraying process.The tribological properties of the C-Mo S₂-PTFE-PEEK coating under dry friction conditions were investigated by friction wear test,hardness test,coating adhesion scratch test,X-ray diffraction analysis,X-ray photoelectron spectrometer analysis,analysis of morphological characteristics and elemental distribution and other test experiments,and the tribological properties of the coating were compared with those of the anodized film of 4032 aluminum alloy and the Ni-plated coating of 4032aluminum alloy.The results showed that the tribological properties of C-Mo S₂-PTFE-PEEK coating under dry friction conditions were compared with those of anodic oxide film of 4032 aluminum alloy and Ni-plated coating of 4032 aluminum alloy.The experimental results show that the friction and wear reduction performance of C-Mo S₂-PTFE-PEEK coating is better than the traditional surface modification method,which provides a theoretical reference for improving the wear performance and efficiency of the vortex disc end face.Figure[45]Table[5]Parameter[65]...