Abstract: According to we finely adjust the suction valve of a type of light commercial compressor and design two kinds of suction valve. The input power, cooling capacity, coefficient of performance (COP) were obtained and analyzed, and verified by the test. The results show that the waist adjustment of the suction valve causes slight changes on the stiffness, which affects the closing angle of the suction valve in the process of movement. The suction valve with higher stiffness can be closed more timely, and the closing angle is 2.68° earlier, which reduces the back flow of the suction side, helps to increase the cooling capacity of the compressor, but causes the increase of the total input power. Finally, the COP of the suction valve with lower stiffness is higher, with an increase of about 0.005. The research conclusions provide ideas and basis for the further efficiency improvement of the compressor and the reliability design of the compressor valve.

Key words: Light commercial compressor, Suction valve, Size refinement