Research On Back Pressure Chamber System Of Electric Scroll Compressor Process

Since the 21 st century,energy and environmental issues have been increasingly concerned by the international community.China has also vigorously developed new energy industry.As a representative of the new energy industry,the electric vehicle has occupied a certain share in the automotive industry and will be a hot spot for the development of the automotive industry.As electric vehicle differs from traditional cars,new requirements are also put forward for air-conditioning compressor.As a fourth-generation compressor,scroll compressor has outstanding advantages such as high volumetric efficiency,compact structure,stable operation,and low noise,and has been widely used in electric vehicle air conditioning system.The back pressure chamber is an important cavity of the electric scroll compressor,and it undertakes key functions such as lubrication circulation and axial force balance of the orbiting scroll.In order to make the structure more compact,the elect ric scroll compressor has the main balance weight arranged in the back pressure chamber.On the one hand,the agitation of the balance weight with the main shaft will have a great influence on the flow characteristics of the lubricating oil and the axial f orce balance of the orbiting scroll.On the other hand,the balance weight itself will have a certain resistance loss.Therefore,the degree of influence and the law of change of the balance weight agitation in the various functions of the back pressure ch amber and the balance weight itself are urgently needed.Establish a simplified model of the back pressure chamber,use Fluent Sliding Mesh technology,and consider the wide range of rotating speed and the complex characteristics of the air conditioning system.Simulate the transient process of balance weight agitating the lubricating oil in the back pressure chamber at different speed and inlet pressure.Firstly,the velocity distribution and streamline diagram on the axial and radial auxiliary planes of the back pressure chamber are analyzed to obtain the lubricating oil flow characteristics.The average lubricating oil flow is analyzed to provide a basis for the lubricant circulation design.Then the axial balance force provided by the top plane of the ba ck pressure chamber and the law of the axial force of the orbiting scroll with the rotation angle of the main shaft are analyzed.Combined with the characteristics of the axial gas force and the axial balance force on the orbiting scroll,A new design method is proposed to coordinate the design of the axial balance force and the axial gas force angle position in order to achieve the best running condition of the orbiting scroll.The two angle schemes provided greatly reduce the range of the axial force of the orbiting scroll,and the orbiting scroll will be more stable and reliable.Finally,the change law of pressure difference resistance,frictional resistance and total resistance coursed by the balance weight agitation is analyzed.The aerodynamic design is used to balance weight,which makes the distribution of the lubricating oil flow streamline in the back pressure chamber more reasonable,fluid energy dissipation and balance weight resistance are reduced,and machine energy consumption is reduced.