1 vertical water pump unit due to the structure, manufacture, installation error, incoming flow and other reasons, the operation of the spindle and impeller by the radial force, the pump guide bearing plays a stabilizing role of the pump shaft and impeller. Guide bearing the earliest use of rubber materials, water lubrication. As the pump to large-scale development, the rotating part of the unbalanced radial force increases, although later the use of better wear resistance of polyurethane and other materials, and the use of water lubrication, but the effect is not good, the bearing material pole Easy to wear, poor running water quality when the river only hundreds of hours. Check found that the inner wall of the bearing was frayed with a large number of sand, indicating that water seal sealing effect is not good, the river sediment will still enter the bearings. Therefore, later widely used in large vertical pumps oil-lubricated Babbitt bearings, to increase its bearing capacity of anti-wear. However, the structure of the oil bearing complex, high cost, fatal drawback is that the following water seal unreliable, often fail a lot of water leakage, and bearing damage caused by flooding. Taking into account the water lubrication guide bearing, as long as sediment does not enter the river to ensure that its operational life may be greatly extended. Analyze its problems, improve its structure, the oil bearing to water bearing. 2 Comparison of two kinds of water lubrication bearing structure 2.1 rubber seal water lubrication guide bearings Traditional rubber seal water lubrication guide bearings taking into account the river water lubrication sediment more serious, at the top of the bearing water tank for pressure water lubrication (Figure 1). This structure in multi-silt pumping station effect is still not satisfactory, the pump body in the river of sediment will still enter the bearings, damage to the bushing and journal. The reason is that after the water flows out from the lower part through the guide vane slot, the overcurrent section suddenly expands to form a recirculation zone at the top of the clear water tank, the water flow velocity slows down and the sediment in the water is deposited by gravity and falls into the clear water tank through the rubber plate sealing gap And the bearing clearance, bearing damage from abrasion. Figure 1 rubber seal seal water lubrication guide bearing 2.2 pipe-type water lubricated bearings Housui water-lubricated bearings, retaining the oil bearing guide vane water guide cone and pump shaft protection tube, the pump body at the upper end of the tube with the pump shaft Between the additional dynamic water sealing device, through the blade embedded in the pipe or guide the upper guide bearing water, the pressure is greater than the pump body of water, water along the bearing wall sink downward flow, the formation of lubrication (Figure 2). This structure compared with the traditional rubber seal sealed water lubrication structure, the upper part of the bearing is completely isolated from the water inside the pump, to ensure that the river sediment will not enter the bearing, the bearing has good lubrication conditions. This is in line with the literature [1] introduced a small vertical guide vane pump silt water pumping protection measures exactly the same. Figure 2 Care-type clear water lubrication guide bearing 3 oil bearing into water bearing application examples 3.1 Application Background Jiangsu Jiangdu third pumping station installed ZL13.5-8 large vertical pump supporting 1600kW vertical reversible variable pole motor 10 Set, pump impeller diameter D = 2.0m, design head 8m, design flow 13.5m3s. The pump adopts double Biyou tube type oil lubricated alloy bearing, the bearing is arranged in the guide vane body hub, the lower part of the hub adopts the comb-tooth labyrinth ring sealing device, the upper part of the hub is connected with the split-type rear water taper and the fixed protective tube, Outside the pump shaft and out of the pump cover, between the outer wall of the protective tube and the pump cover is provided with a static seal, the inner side of the protective tube and the pump shaft communicating with the atmosphere [2], prevent the pump body of water into the guide vane body hub cavity damage oil bearings.
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