Patent ID: 9027934
Filing Date: 2015-05-12
Classification: F04B,F16J

Abstract:
1. A sealing assembly for sealing a reciprocating piston rod of a reciprocating compressor positioned radially inwardly thereof, said sealing assembly having a cylinder end and a crankcase end and comprising: a housing which defines a hollow interior that faces radially inwardly, first and second chamber plates positioned within said hollow interior and which define a first recess that faces radially inwardly, first and second sealing elements positioned within said first recess, a first fluid line connected to said first recess, a pump connected to said first fluid line for delivering sealing medium to said first recess at a pressure which is higher than a pressure at said cylinder end of said sealing assembly and biasing said respective first and second sealing elements to opposite axial ends of said first recess and moving said first and second sealing elements radially inwardly, a third chamber plate positioned in said hollow interior at said cylinder end of the sealing assembly, said third chamber plate defining a third recess facing radially inwardly, a third sealing element in said third recess, said third sealing element comprising at least one packing ring, a fourth chamber plate positioned in said hollow interior between said third chamber plate and said first chamber plate, said fourth chamber plate defining a fourth recess facing radially inwardly and an intermediate space between said fourth recess and said third recess, a scraper ring positioned in said fourth recess, a second fluid line which extends partially through said fourth chamber plate and connects to said intermediate space, and a connection bore which extends from said second fluid line to said fourth recess, the interconnected second fluid line and connection bore functioning to maintain the scraper ring in the fourth recess without differential pressure thereon when in use.