A DEVICE FOR ABSORBING THE AXIAL THRUST OF A MULTISTAGE CENTRIFUGAL PUMP

摘要

This invention relates to a device for absorbing the axial thrust of a multistage centrifugal pump, which possesses an axial gap (8), radial gaps (6, 7), an axial bearing (9) absorbing the remaining residual thrust. The axial bearing (9) is being assigned a cardanic ring (10) serving for the compensation of errors of alignment. The relieving device is designed in such as way that, in all the operating states, a residual thrust occurs which acts in the direction of the suction side of the centrifugal pump, and in that the cardanic ring (10) is dimensioned in such a way that it is deformed elastically by the residual thrust. The spring constant of the cardanic ring (10) possesses a characteristic such that, starting from a maximum gap width (s) in the state of rest of the centrifugal pump, the axial gap (s) (8) close (s) under operating conditions to a minimum width at which contact between the faces delimiting the axial gap (s) (8) is still avoided. (FIG. - 1)