Importance

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Abstract

A centrifugal pump provided with an impeller, a pump shaft, a pump housing and with a motor coupled to the pump shaft. A shaft seal device is arranged between the pump shaft and the rear wall of the pump housing respectively, and a cooling unit mounted on the outer surface of the latter at the location where the shaft extends through a hole in the rear wall. The shaft seal device is provided with a first set of sealing element arranged between the rear wall and the pump shaft as well as with a second set of sealing element arranged so as to prevent coolant from leaking between the shaft and the cooling unit. A thrust collar is interconnected with a flush pipe extending inside the collar but around the pump shaft and further arranged under the two sets of sealing element. Coolant can flow on the inner surface as well as on the outer surface of the flush pipe. A particularly efficient seal is provided at the location in the rear wall where the extends therethrough.

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First Claim