| 主权项 |
1. A submerged centrifugal electric pump, comprising:
a tubular-shaped external casing comprising a first tubular portion and a second tubular portion suitable to be connected coaxial to each other; a pumping unit axially inserted into a first chamber defined in said first tubular portion of said casing to suction a liquid through a suctioning opening and transfer said liquid through a discharge opening; a motor unit axially inserted into a second chamber defined in said second tubular portion of said casing and provided with a motor shaft to be operatively connected to said pumping unit; a means for fixing an axial position of said motor shaft interposed between said motor unit and said pumping unit and said means for fixing comprising a substantially tubular-shaped occlusion member having an elastic material portion for engaging an internal surface of said casing in correspondence of a connecting end of said second tubular portion to said first tubular portion; a tubular-shaped support body for being inserted coaxial inside said casing and axially linked to said occlusion member; a fastening member associated with said occlusion member to perform a radial expansion of said elastic material portion, so as to fasten the elastic material portion against said internal surface of said casing, said elastic material portion of said occlusion member having an internal operating side, said internal operating side having a substantially frusto-conical abutment surface, in correspondence of a zone for engaging said fastening member; and a rolling support means associated with said motor shaft for holding axial thrust, and inserted into a seat made in said support body, said rolling support means comprising a thrust bearing member provided with an internal part, blocked between a shoulder of said motor shaft and a ring engaged in a groove of the motor shaft, and an external part blocked between a ring engaged in the support body and an internal shoulder of the support body. |
