Abstract: The pretightening force of the screw in the cylinder head of the refrigerator compressor causes the deformation of the cylinder hole, which has a great inpact on the compressor’s performance and reliability. This paper mainly establishes a numerical method for analyzing the cylinder deformation caused by the screw force of the cylinder head’s. The numerical model of the compressor is established by the finite element method. The cylinder head screw is preloaded, and the deformation of the cylinder bore is analyzed, so as to judge whether the stiffness of the crankcase cylinder is reasonable, which has a some guiding significance for the design of the reciprocating compressor crankcase.

Key words: Reciprocating compressor, Screw pretightening force, Cylinder deformation