Problems with reciprocating compressor piston rings and piston ring grooves
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The piston rings should move freely within the piston grooves and possess a certain degree of expansion force; when pressed by hand, they should be completely seated within the grooves and should be 0.5–1.0 mm lower than the surface of the piston. The reason why the piston ring is 0.5–1.0 mm lower than the piston surface.
The piston ring is lower than the piston surface, which meets the requirements for back clearance. To prevent the rings from getting stuck inside the cylinder, if the back clearance is too small, the piston ring grooves can be drilled deeper appropriately.
On the piston, in addition to the piston rings, there are also support rings. These support rings serve to provide support on the left and right sides, and their height is higher than that of the piston surface; the lower position of the piston rings is intended to prevent wear
First, understand the functions of the piston ring and the support ring. 1. Piston rings serve to seal gases ； 2. The support ring serves to bear the weight of the piston and cylinder (I’ve forgotten the specific percentage it supports). Piston ring sealing is achieved by the pressure of the gas pushing the piston rings into contact with the cylinder wall, thereby creating friction for sealing purposes. As designed, the piston rings should be lower than the surface of the piston; if they are higher, they will encounter excessive resistance while rotating in their grooves, which can lead to jamming. This results in increased friction between the piston rings and the cylinder wall, causing the seal to fail and producing abnormal noises inside the cylinder.