Patent ID: 6402462
Filing Date: 2002-06-11
Classification: F04D,F16J,Y10S

Abstract:
A centrifugal pump with a floating ring seal in a sealing chamber for delivered fluid for a pump shaft and blade-like flat portions arranged in the sealing chamber between a peripheral wall thereof and the floating ring seal and extending in longitudinal section substantially parallel to the pump shaft, wherein arranged in a head region of the sealing chamber is at least one closeable vent opening, characterised in that the blade-like flat portions (60, 60a) extend at the peripheral wall (48) on each side of the at least one closable vent opening (47) and the two flat portions are inclined relative to each other in cross-section and at a spacing relative to the peripheral wall to define between them an antechamber (72) with a gap (70) which is substantially parallel to the pump shaft (14).