Patent ID: 6695576
Filing Date: 2004-02-24
Classification: F04D

Abstract:
A pump for liquids, in particular, a centrifugal pump for electric household appliances and the like, comprising:a rigid support structure including a body having an annular end in which an opening is defined, and a volute connected to the said end of the body so as to define a pumping chamber therewith, a bladed rotor disposed in the chamber and connected to a drive shaft which is mounted rotatably in the body and extends through the opening, and a first annular sealing member and a second annular sealing member which are carried by the structure and which encircle the drive shaft in a leaktight manner in respective axially spaced-apart positions, a lubrication chamber containing a lubricating grease being defined between the sealing members and the drive shaft, and a first sealing ring, closer to the rotor, having a radially inner portion which forms at least one sealing lip which bears on the shaft and a radially intermediate circular portion which is disposed outside the at least one lip and which has a substantially U-shaped cross-section with its convex side facing the rotor.