CONTACTLESS SEALING DEVICE Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: shaft is installed in a spaced relation to the casing circular groove. Hermetically secured on the shaft is a disk-shaped impeller with radial blades on the end surface, facing the opposite direction of the sealed space. A number of by-passes with inlet and outlet sections are made in the casing end wall, on the side of the blades. The inlet sections are shifted to the periphery of the impeller, and the outlet sections to its base. EFFECT: enhanced reliability. 7 cl, 5 dwg