Patent ID: 6824350
Filing Date: 2004-11-30
Classification: F04D

Abstract:
Hydrodynamic sealing system for centrifugal systems, comprising:a double, asymmetric impeller (2) attached to a rotary shaft (3), a fixed housing (4) that surrounds said double impeller (2), a fluid inlet (5) in axial direction and a fluid outlet (6) in radial direction with respect to the double impeller (2), with said double impeller (2) defining a front side (7) which receives the entry of fluid and a rear side (8) close to the sealing zone (9) of the shaft (3) with the fixed housing (4), wherein said double impeller (2) is provided with means (10) for taking the fluid from its front side (7) to its rear side (8), wherein the means for driving the fluid between the two sides (7, 8) of said double impeller include openings (10) made in a core or intermediate wall (11) of said double impeller (2), which depending on their position in relation to the shaft of said double impeller (2) and their size permit a pressure in the sealing zone (9) to be suitably controlled, so that the pressure is an atmospheric pressure.