Analysis And Experimental Study On The Aerodynamic Noise Characteristics Of The Exhaust Components Of Air Conditioning Compressor

With the rapid development of science and technology and the improvement of quality of life in China,all kinds of household appliances,especially air conditioners,have gradually become the necessities of life.Air conditioners bring people comfort,but also have a huge negative impact,especially the noise generated by air conditioners.As the core component of air conditioners,compressor naturally becomes the focus of public attention.Secondly,due to At this stage,the fierce competition in the air-conditioning industry has once again pushed the urgent development of the air-conditioning industry to a climax.This paper focuses on the flow process of refrigerant in the compressor pump and the generated aerodynamic noise,and studies it from the theoretical and experimental direction,and carries out the subject under the condition of fully mastering the research status,background and future development direction of the rotary compressor industry.Using the CFD general software PumpLinx to control the deformation area of the compression cavity in the pump body,a compressible turbulent flow model including the complex space of the pump body from the intake to the exhaust fluid area is established,and the dynamic simulation of the refrigerant flow process is realized,which provides some reference for the follow-up simulation analysis and guiding the actual development and production;using fluent and LMS virtual Lab combined system to simulate the flow field and acoustic calculation of the high-speed flow refrigerant in each component of the exhaust module,and compared the numerical results with the experimental results,which verified the accuracy and reliability of the simulation method and turbulence model.In the analysis of the flow of refrigerant in the pump body,it is found that there is obvious pressure disturbance at the inlet and outlet.When the pressure disturbance propagates in the flow space,it will produce impact and vortex flow.It is mainly formed at the inlet and the outlet near the blade area,which is the main aerodynamic noise source in the cylinder body.The traditional structure of the exhaust cavity is analyzed The aerodynamic noise is mainly caused by the interaction of high-speed refrigerant with valve plate and guard plate and the pressure pulsation caused by the collision with rough exhaust tank wall.At the same time,the transmission loss of muffler is calculated to compare with the transmission loss of improved structure.Based on the study of the flow characteristics of the refrigerant in the discharge module,a new design structure is proposed in this paper.Compared with the traditional structure,the guard board and muffler cover which limit the lift of the valve plate are removed from the traditional assembly parts,the support on the pump body itself is taken as the structure of limit the lift of the valve plate,and the space of the valve plate movement can be used as a single expansion pipe muffler.The results show that the new type of timing unit has a larger volume reduction than the existing structure in a wide frequency range,which has a positive effect on improving the air flow noise of the compressor.Finally,a test-bed is built for experiment and comparison to verify the correctness of the simulation and the feasibility of the structure.Although there are still a lot of work to be improved in this study,it has a very important practical significance for the development of the research on the aerodynamic noise direction of the rolling rotor compressor.