Influence of Cylinder Offset on the Operation Characteristics of an Oil-Free Lubricated Wobble-reciprocating Compressor

Abstract

This work introduced the structural characteristic and working principle of cylinder offset oil-free lubricated wobble-reciprocating compressor. A mathematical model of crank-link mechanism was setup. The influence of cylinder offset to side clearance, side pressure and friction power were discussed. It revealed that when the offset applied on suction stroke side, the peak value of side pressure in suction stroke was relatively low in comparison to that of the compression stroke. Low friction loss was hereby achieved; meanwhile the system’s sealability was deteriorated, due to the larger backlash between piston and cylinder during the compression process. Reverse trend was found when the offset moved to compression stroke side. The side pressure in suction stroke and the friction power increased, with the decrease of side pressure of compression process and the improvement of sealability.