Axial thrust balancing device for pumps

摘要

This invention relates to an axial thrust balancing device for pumps which cancels an axial thrust caused by impellers by utilizing a discharge water pressure. In the device, there is provided a small axial gap between a low pressure sidewall of a balancing drum tightly fitted over a shaft of impellers and a flange-like end wall extending inwardly from a stationary wall along the low pressure sidewall of said balancing drum. On application of the device to a vertical pump, in particular, the balancing drum is prevented from being in contact with the end wall during suspension of operation.