Water pump rotating shaft supporting device for multistage centrifugal pump

The utility model belongs to the technical field of centrifugal pumps, specifically relates to a water pump rotating shaft supporting device for a multistage centrifugal pump. The supporting device is especially suitable for main drainage, forcible drainage and mine recovery drainage after flooding in a mining area. The device comprises a bearing body for supporting the end of a water pump rotating shaft, wherein a sliding bearing is arranged between the bearing body and the water pump rotating shaft, and a bearing lubrication cooling mechanism capable of introducing the stage pressure difference of the centrifugal pump to keep normal operation of the sliding bearing is arranged on the centrifugal pump. According to the supporting device provided by the utility model, the sliding bearing is used as the supporting bearing at the end of the water pump rotating shaft, and water is used to conduct lubrication cooling of the sliding bearing at the same time, thereby lowering the noise and temperature rise of the sliding bearing and greatly improving the mechanical efficiency and operating reliability of the sliding bearing; and further the multistage centrifugal pump can operate in both a dry-type operating condition and a wet-type operating condition, thereby not affecting the drainage performance of the entire pump set.