In design and calculation of scroll compressor with symmetrical circular arc plus line-shaped top profile

rotating angle of crankshaft at the very moment when centre compression chamber is formed is totally different from that at the beginning of the discharge. There is no complete and distinct elaboration about the two kinds of angles yet

so it may cause large errors in calculating different compression chambers.Through in-depth research on the geometric property of scroll compressor with symmetrical circular arc plus line-shaped top profile

mesh-apart angle and discharge angle are defined and distinction between them is illustrated. According to the feature that reduction of centre compression chamber is due to an increase in wall thickness of top profile

the calculation formula of mesh-apart angle is derived elaborately and the methods to calculate the expanded volume of wall thickness of top profile and discharge angle after modification are presented. The difference between mesh-apart angle and discharge angle is verified through calculation example

it is mentioned that discharge angle of scroll compressor can make an impact on design of discharge port.