RECIPROCATING PISTON COMPRESSOR

摘要

The compressor contains at least one piston which, together with a cylinder insert, bounds a ring gap which is open over the common longitudinal section and permits a leakage flow of the compressed medium. The piston rod co-operates with a piston and a support part via support surfaces which permit relative movements of the support part with respect to the piston which extend transversely to the longitudinal axis. The piston has a metallic basic body and a sleeve member made of a plastic material on which the running surface of the piston is formed. The cylinder is manufactured of a material whose coefficient of thermal expansion corresponds at least approximately to a resultant coefficient of thermal expansion of the materials of the basic body and of the sleeve member. The compressor in accordance with the invention is particularly suitable for the oil-free compression of a gas.