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Influence of back pressure disturbance balance disc on viscous internal flow of scroll compressor
Published:2024-10-30 author:LIU Xingwang, LI Gengze, LIU Xiaoming, et al. Browse: 139 Check PDF documents
Influence of back pressure disturbance balance disc on viscous 
internal flow of scroll compressor


LIU Xingwang1, LI Gengze1, LIU Xiaoming2, LIU Guojun1, WANG Long1


(1.School of Petrochemical Industry, Lanzhou University of Technology, Lanzhou 730500, China; 2.Compressor 

Technology Laboratory of Anhui Province, State Key Laboratory of Compressor Technology, Hefei 230031, China)


Abstract:  Aiming at the problem that the back pressure generated by the lubricant in the back pressure chamber of the electric scroll compressor can not balance the axial gas force accurately under the working condition of variable rotational speed, a back pressure disturbance balancing disk with a disturbance piece was proposed. Firstly, the principle of the back pressure disturbance balance disk was analyzed, the Bezier curve was used to construct the disturbance piece profile, the static pressure increment of the disturbed lubricant was derived and the influence on the outlet installation angle and the number of the disturbance piece on the static pressure of the lubricant were calculated theoretically. Then, the model of the back pressure cavity containing the back pressure disturbance balance disk was established, the fluid domain was divided into the rotating domain and the fixed domain, the numerical simulation was carried out with a rotating coordinate system and the pressure field of the lubricant in the back pressure chamber was studied. Finally, the static pressure of the lubricant at different outlet installation angles and different number of disturbance pieces was simulated according to theoretical calculations and analyzed in comparison with the optimal back pressure of the compressor. The research results show that the back pressure disturbance balancing disk can make the lubricant static pressure increase by 21% and the static pressure increment increase with the increase of spindle speed. The appropriately increased disturbance piece outlet installation angle can make the lubricant static pressure increase 0.032 MPa. After comparing with the optimal back pressure, the difference between lubricant static pressure and the optimal back pressure before disturbance is 26%, while the difference between the lubricant static pressure and the optimal back pressure after the reasonable design of the disturbing piece is only 9%, which greatly improves the axial balance of the electric scroll compressor at variable speed.

Key words: electric scroll compressor; disturbance sheet model; outlet installation angles; number of disturbance pieces; variable working conditions; axial balancing; lubricating oil static pressure increment; optimal back pressure

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