Flow Field Characteristics Of The Scroll Compressor And Stress-strain Analysis Of Orbiting Scroll Wrap

The internal flow field of the scroll compressor working chamber changes rapidly,and it is difficult to obtain the distribution of fluid transient parameters by experimental method.The internal flow field characteristics are studied by combining theoretical model and numerical simulation.During the working process,the working environment and force of the orbiting scroll are complex,which leads to the deformation of the scroll teeth and affects the working efficiency and reliability of the scroll compressor.Aiming at the pre-compression phenomenon and flow field characteristics,the geometric model and mathematical model are established.The dynamic mesh technology is used to simulate the flow field distribution at different crankshaft speeds,and the mechanism of pre-compression phenomenon is proved.There are asymmetric flow field distribution and different intensity vortex areas in the suction process,and pre-compression occurs at the end.With the increase of crankshaft speed,the crank angle of pre-compression occurs about 10 °～ 21 ° in advance,which causes the pressure in the suction chamber to increase by 23.5 % ～ 29 %,so that the actual suction volume is no longer equal to the ideal suction volume,and the vortex phenomenon at the tail of scroll teeth is also intensified.During the compression process,the pressure distribution in the same pair of compression chamber is symmetrical and the temperature distribution is uneven.The exhaust process affects the flow field distribution in the exhaust pipe and the central compression chamber due to the periodic opening and closing of the exhaust port.Aiming at the problem of stress and strain distribution of the orbiting scroll plate,based on the finite element theory,the force and deformation analysis are carried out by numerical simulation.The method of solving the temperature load of the scroll plate is improved.The nonlinear distribution is used to deal with the temperature load and solve the temperature distribution function of the scroll plate.Single load and multiload coupling are applied to the scroll plate respectively,and the stress and strain characteristics of the orbiting scroll plate under different loads are analyzed.Under multi-load coupling,the maximum deformation and stress of the scroll tooth are greatly affected by the inertial force.The maximum deformation and stress value of the scroll tooth increase by 7.97 μm and 52.5 MPa respectively compared with the temperaturegas pressure load.In different working chambers,the deformation of the inner wall of the scroll tooth is greater than that of the outer wall,and the maximum difference is1.11 μm.Between different working chambers,the deformation amplitude of the inner and outer walls gradually decreases with the gas compression process.The above research is helpful to optimize the suction and compression process of the scroll compressor,improve its operating efficiency,and provide certain theoretical references for the structural design and improvement of the scroll plate.