Mechanical seal washing water and bearing cooling water supply system of centrifugal pump and control method

The invention discloses a mechanical seal washing water and bearing cooling water supply system of a centrifugal pump and a control method, and is mainly used for supplying mechanical seal washing water of the centrifugal pump and bearing lubricating oil cooling water at the two ends of the pump in water transfer by the aid of a complex-terrain, long-distance, large-pipe-diameter and high-lift pipeline. Specifically, a four-way connector is installed on a centrifugal pump body to be connected with a pipeline for water diversion, one end is installed on the centrifugal pump, outlet water is discharged in three directions, an upper opening of the four-way connector is connected with a pipe and provided with a ball valve, air in a pump cavity is discharged, a water outlet pipe of the four-way connector is connected to mechanical seal water supply openings at the two ends and cooling water tanks of bearings at the two ends of the pump, connecting pipelines are designed on the cooling water tanks of the bearings a