Motor pump assembly comprising a flushed rear-bearing system combined with an electrical rotation direction detector.

摘要

The motor pump assembly comprises a shaft (3) for a rotor (13) carried on two bearings (19, 28, 22) and firmly attached to a rotor (13) of an electric motor (4) immersed in a rotor liquid circuit which is defined by an air gap tube (12) of the electric motor (4) and is connected in parallel between the periphery of the pump rotor (2) and a return via an axial passage (5) in the shaft (3) of the rotor (13) of the motor (4). The rear bearing system of the shaft (3) of the motor (4), located on the side opposite the pump rotor (2), comprises at least one bearing passage (32, 23, 5a) connected in parallel to the rotor liquid circuit which returns to the downstream circuit (1) of the pump through the shaft (3) of the rotor (13) of the electric motor (4), so as to bring about automatic draining of the rotor liquid circuit. Application to central heating circulating pumps with three-phase asynchronous motor. <IMAGE>