Bearing temperature lower horizontal hydroelectric generating set some of the ways - bearing knowledge

1 power plant overview of gaozhou county, guangdong province, pale hydroelectric power station is a runoff hydropower station, the catchment area of 39. 6 km2, the installed capacity of 2800 kw, including a 800 kw, another 2000 kw. Turbine models respectively: HLA218 - WJ - And HL160-60 WJ - 71; Generator model is respectively: SFW800 - And SFW2000-6/1180 6/1430. Both sets of hydroelectric generating set for chongqing water turbine factory products, belong to two fulcrum structure, thrust bearing in permanent magnet machine side, changed the traditional Settings, namely thrust bearing between the generator and the turbine. Both units are put into operation in September 1991. Until January 1998 for seven years, the ultra high temperature operation of the unit bearing are, sometimes as high as 73 ℃, and was forced to stop, this has caused the tile burning failure many times. By our technical staff, ZhuGuanJu engineers and the processing of neighboring brothers power station of countless times, still have little effect. Later after the manufacturer Wang Shouzhong strong participation, engineers, and the author of bearing oil and cooling circulation system, temperature has a significant decrease, has achieved a great success. 2 defects in the repair process of the past, our levelness, concentricity and smoothness of the spindle and the tile surface crapping all in strict accordance with the manufacturer and the relevant code requirements. Cooling water water quality, water pressure also conforms to the standard, but the temperature is not fall down. Finally, in December 1997, the manufacturer Wang Shouzhong engineer to on-site guidance, inspection, found that the main force of the bearing on the design of the internal there are some problems: 1. Cooler capacity is too small, failed to take away a large amount of waste heat, bearing internal cause temperature rise. 2. Thrust plate of the main mirror plate of vertical degree is not enough, one of the units is mainly due to thrust head caused by loose. In some places higher than 0. 5 mm, but in some places to settle 0. 15 mm, causing thrust tile surface stress in some places is overweight, and some places don't stress, so that the stress after a certain time of running friction surface temperature, temperature rising, eventually lead to the tile burning failure. 3. Thrust bearing no dedicated cooling pump, cooling oil circulation mainly by smooth full thrust ball and take part of the cold oil, high speed rotation of failed to produce the effect of the temperature decrease. 4. Upper and lower bearing of the oil hole is too small, make the cold oil circulation greatly hindered, so can't cooling. Three improvement measures in view of the four major shortcomings exist, we take the corresponding measures: 1. In the position of the bearing inner free equipped with cooler, cooler is made from the hollow copper pipe, and outside the copper tube with lathe processing into spiral shape, facilitate heat dissipation. 2. For loose thrust head, because the scene processing is difficult, we together with the main shaft back to the manufacturer to repair. After repair the mirror plate verticality biggest differ in plus or minus 0. Less than 5 mm, to receive strength evenly in the thrust tile. 3. Because there is no specific oil pump, we in the lateral thrust ball processing four symmetrical spoon holes, spin bring a lot of cold oil from below, the cooling effect is greatly improved. 4. Upper and lower bearing of the oil hole from 10 mm to drill for 14 mm, make up the cold oil more clear. 4 conclusion through a series of transformation and for more than two years of operation, proved that bearing temperature at a temperature below that at which allows all the time, made the technical renovation has achieved results, improve the level of the production safety, increase the economic benefits, create social value.