CONTACTLESS SEALING DEVICE Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: open-type impeller made in the form of a disk with radial blades on its location surface and fixed on the shaft is located in the casing annular chamber with axial clearances between the end surfaces of the blades and mating end flat wall of the chamber, and radial clearances between the external edges of the blades and cylindrical surface of the chamber. The distance between the external edges of adjacent blades or their groups and the disk axis is cyclically alternating one in circumferential direction. EFFECT: enhanced reliability. 3 dwg