CONTACTLESS SEALING DEVICE Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: shaft is provided with an open type impeller and radial blades provided on one of its sides. The impeller is received in the ring chamber of the housing with a constant spaced relation between the outer edges of the blades and cylindrical surface of the ring chamber of the housing and constant axial spaced relation between the end face surface of the blades and answered end face surface of the wall of the housing chamber. The sizes of the adjacent blades or groups of the blades vary cyclically over the periphery of the impeller. The height of the adjacent blades or their groups varies sinusoidally. Radial size of the adjacent blades or their groups varies sinusoidally. EFFECT: enhanced reliability. 3 cl, 3 dwg