Internal Cooling of the Piston Rod in Non-Lubricated Piston Compressors

摘要

In non-lubricated piston compressors the wear of the piston rod packing rings is still a problem that needs to bernconsidered. Due to the demands of high gas pressure and leak-tight sealing the frictional heat of the rings is causingrnhigh temperatures in the area of the piston rod packing. High temperatures are – among other factors – one reasonrnfor an increase of wear and thus for a lifetime reduction of the packing. To increase this lifetime – and so to increasernthe time between two technical services – the idea of an internal cooling of the piston rod with a phase changingrnmedium was created. To investigate this new cooling method for non-lubricated piston compressors a researchrnproject between the EFRC R&D Working Group (European Forum for Reciprocating Compressors) and thernTechnical University of Dresden was initiated. Within this project a test bench with a full scale balanced opposedrnprocess gas compressor was set up and measurements shall be taken. The measured values will be used for arnvalidation of a thermal simulation model based on the software ANSYS. Also a model test rig is investigated whichrnallows the investigation of temperature along a hollow piston rod in a moving system.