SHAFT SEAL AUXILIARY FLUSHING SYSTEM FOR CENTRIFUGAL PUMP AND AXIAL-FLOW PUMP

摘要

A shaft seal auxiliary flushing system for a centrifugal pump and for an axial-flow pump, provided with a main operating pump (1) and a standby pump (2) respectively provided with identical shaft seal flushing systems. The shaft seal flushing system of the main operating pump (1) and the shaft seal flushing system of the standby pump (2) are connected in parallel with each other to constitute common shaft seal flushing systems that are in communication with each other. The common shaft seal flushing systems are such that: a first water outlet pipe (5) connected onto a water outlet (23) of the main operating pump (1) and a first opening/closing valve (3) provided on the first water outlet pipe (5) and used for controlling outflow of flushing water, a second water outlet pipe (6) connected onto a water outlet (24) of the standby pump (2) and a second opening/closing valve (4) provided on the second water outlet pipe (6) and used for controlling outflow of flushing water, and a first fluid guide pipe (7) connected onto a water outlet of the first water outlet pipe (5) and that of the second water outlet pipe (6), where a water outlet of the first fluid guide pipe (7) is respectively connected to a flushing water inlet on a sealing gland (10) of the main operating pump (1) via a third water outlet pipe (8) and to a flushing water inlet on a sealing gland (11) of the standby pump (2) via a fourth water outlet pipe (9). Fluid material parameters in sealed cavities of the main and standby pumps can be kept identical at all times by means of the flushing system.