Hydrodynamic sealing system for centrifugal systems

Abstract

Comprises 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). Said system is characterised in that said double impeller (2) is provided with means (10) for taking the fluid from its front side (7) to its rear side (8), so that when the double impeller (2) rotates there arises a control of the pressure in the sealing zone (9), thus permitting balancing of the stresses on the impeller and optimisation of the sealing system.

Dependencies are inferred from the claim text.