Research And Development Of High Efficient Scroll Compressor With Economized Vapor Injection

As the latest generation of the displacement compressor,the scroll compressors are used widely in the air conditioning for industry and commerce by the advantages of light weight,small volume,small vibration,low sound,high performance and high reliability.Recently,with the fast development of refrigeration and food cold chain,the marketing for refrigeration compressors increases quickly.So the refrigeration scroll compressor becomes one of the important fields for scroll compressor development.The refrigeration scroll compressors increases its market share by the advantages of lighter weight,smaller volume and higher performance,compared with the traditional refrigeration reciprocating compressor.The existing refrigeration scroll compressors use the involutes of circle as the geometry of the scroll wraps,which lowers the advantages of light weight,small volume and high performance of scroll compressors.Since the compression ratio of the refrigeration conditions is higher,the reliability of scroll compressors under high compression ratio is the bottle neck which decides the application of scroll compressors in refrigeration field.This paper studied and developed a refrigeration scroll compressors with higher performance and reliability.The hybrid scroll wrap geometry was studied and developed,which provides high compression ratio,shortens the leaking length and reduces the outer diameter of scroll wraps.So the compressor performance is increased,and the compressor volume and weight is decreased.The key to increase the performance and reliability of compressors is to improve the dynamics of compressor parts.This paper discusses the axial compliance design,the radial compliance design and optimizes the related parameters,which improves the dynamics of the main parts of compressor.So the performance and reliability of compressor is increased.The parameters of the inject port on fixed scroll is optimized,which balances the performance with and without EVI(Economized Vapor Injection)application.At last,the tests are done to verify the performance and reliability of compressor.The test results show the performance with and without EVI achieved the requirements of design target,and all reliability tests passed,which will guide the compressor production in future in theory.