초록 ▼

In order to accommodate a labyrinth seal whose diameter is too large to form a gas passage using conventional techniques, the labyrinth seal is made in two parts. A first part is an inner ring whose outer diameter is sufficiently small so as to permit the forming of a passage therein with convention

In order to accommodate a labyrinth seal whose diameter is too large to form a gas passage using conventional techniques, the labyrinth seal is made in two parts. A first part is an inner ring whose outer diameter is sufficiently small so as to permit the forming of a passage therein with conventional techniques. The second part is an outer ring which can then be fastened to the inner ring so as to then extend, in combination, to the radial extent necessary to complete the sealing engagement with an adjacent element. The outer and inner rings are preferably interconnected by way of an interference fit.

대표청구항 ▼

[ What is claimed is:] [1.] In a centrifugal compressor of the type having a drive shaft, an impeller, a bearing, a transmission chamber and a balance piston to counteract the thrust load of the impeller, a labyrinth seal interposed between the balance piston and the transmission chamber, wherein th

[ What is claimed is:] [1.] In a centrifugal compressor of the type having a drive shaft, an impeller, a bearing, a transmission chamber and a balance piston to counteract the thrust load of the impeller, a labyrinth seal interposed between the balance piston and the transmission chamber, wherein the labyrinth seal comprises an inner ring and an outer ring, said inner ring comprising:an axial opening with radially inwardly extending teeth for sealingly receiving said drive shaft therein,a rear face for engaging a surface of the bearing disposed adjacent thereto,a passage formed between said rear face and said axial opening for providing fluid communication therebetween for the purpose of pressurizing the labyrinth seal, andan outer cylindrical surface located radially outwardly from said passage; andsaid outer ring comprising: an axial opening for receivingly engaging said outer cylindrical surface of said inner ring,an axially extending flange integrally connected near a radially outer portion of said outer ring, andsaid flange having radially extending teeth for sealingly engaging a surface on a rear side of said impeller.