If there is a gap on the dynamic sealing surface, a large flow of oil will escape. There are no sealing strips in these two places, which increases the risk of leaks. ③ There is a sealing strip on the upper oil basin cover and the upper oil basin cover of the water guide. It is the same as the sealing strip at the bottom. The sealing strip is pressed by the tightening force of the bolt. form a sealing surface. There are also possible leak points ④ At the labyrinth ring, the upper labyrinth ring is closed on the oil basin and the lower labyrinth ring is locked on the water guide tile by the pin labyrinth lock. two labyrinth rings should measure 1.8~2.2mm. When the unit is running, oil flows up the labyrinth ring to the oil return hole at the junction of the two labyrinth rings. The oil that rises here returns to the basinn oil through the hole if the hole is clogged. As a result, the return flow is not smooth and the turbine oil will be discharged out of the water-oil guide basin. ⑤ At the two sealing strips between the tile frame and the guide tile, it can be seen from the structure and working principle of the simple tile that the large shaft will continue to rub and impact the tile surface when the unit rotates, and the impact force is transmitted to the tiling frame through the tiling lifting bolts, the fixed tiling frame is fixed to the upper cover. If the impact force is large, the tile lifting bolts will loosen, causing a large gap to form between the tile frame and the tile frame. tiling, which will cause oil leakage from the water guide bearing. ⑥ The joint between the tile frame and the big shaft. The sealing material between the big shaft and the tile frame is pressed by thebolts. Long-term operation will cause the felt seal to fail and result in oil leakage. ⑦Other oil leakage points mainly include: the output of the temperature measuring resistor, the connection point of the oil-water signal device, the oil port of the cooler, etc. If oil is leaking from these parts, it is only a very small amount and is not the main point of oil leaking. When installing the water guide bearing, the treatment process of the sealing surface did not meet the manufacturer's requirements. There were too many burrs and the sealing surface was rough, and there were even large pits that could leak oil. Through the above analysis, the exterior of the water guide bearing was carefully inspected, but no obvious oil leak points were found. Problems inside the water guide bearing, for example if the r holeoil return is blocked, if the sealing effect of the sealing strip. is good, etc., can only be solved after disassembly of the bearing. The internal structure cannot be inspected. 3. Solution to water guide bearing oil leakage problem. In order to accurately grasp the amount of oil leakage in the water guide oil basin, the oil level in the water guide oil basin was measured. The measurement data is as shown in. Table 1: Table 1 Oil level measurement data Table 2 Processed oil level measurement data 3.1 The first treatment plan It can be seen from the above table that the daily oil leakage volume gradually increases, l The unit must therefore be immediately treated to avoid oil. The season at that time was the rainy season, and the unit was not allowed to shut down for a long time so as not to affect the impact. A simple temporary treatment was carried out tor electricity production. Use a pneumatic wrench to symmetrically. Tighten the tile lifting bolts to reduce the gap between the tile frame and the tile. After treatment, the measurement was performed again. The data is shown in Table 2. It can be seen from Table 2 that the tightening of the lifting bolts has played a certain role, but a large amount of oil still escapes every day, which does not fundamentally solve the problem. oil leak problem. The reasons need to be studied in more detail. 3.2 The second treatment plan is to shut down the unit, disassemble the water guide bearing and perform a full inspection. When checking the two joints between the tile frame and the tile, it was found that the sealing strip was hard. During installation, the sealing strip was coated with more sealant. The glue and sealing strip were integrated into one and becameare a hard block. so that the sealing strip has no elastic recovery force. A gap is formed between the tile frame and the tile, and a large amount of turbine oil escapes. No anomalies were noted in the other rooms. According to the traditional treatment method, replace the same sealing strip, apply the same sealant and reinstall it. After reinstallation, measure the oil level.According to Table 3. Table 3 Oil level measurement data after reassembly Table 3 shows that after the unit is processed, the initial oil leak is significantly reduced, but after the unit has been running for a while, the oil leak shows an increasing trend and rises to the level of the first simple treatment (tighten the elevator). The amount of oil leakage behind the tile bolt) shows that replacing the sealing strip did not have a good effect. The initial effect of replacing thesealing strip is better. The reason for the analysis is mainly that the initial sealing strip is still elastic, and the impact of sealant curing at low temperatures is not obvious. As the operation time increases, the sealing strip hardens together. with the sealant, and the sealing strip completely loses its elasticity. The sealing effect is lost; the material selected for the sealing strip does not comply with standards. 3.3 The third treatment plan learned from the second treatment and replaced it with Aizhigao recovery elastic sealing strip for the second time. At the same time, the traditional process has been modified directly without applying putty. The oil level in the water guide oil basin remains unchanged, completely solving the problem of oil leakage in the water guide bearing. 4 Conclusion: Choose sealing strips of different materialsux depending on local conditions. Different working environments need to use sealing strips of different materials. If the working environment is particularly harsh, low temperature and humid, sealing strips with high elastic recovery power should be used. Some traditional processes need to be modified appropriately. No sealing tape should be used on sealing strips. It can be used directly without glue, so that the equipment can better adapt to on-site conditions. The sealing strip of the water guide bearing of Unit 5 of Wanjiazhai Hydropower Station was treated in the same way. After their replacement, units 5 and 6 have been operating for over a year without any oil leaks.
General. water wheel The generator set undergoes a thorough overhaul every 3 to 5 years, at which time the generator will be dismantled. CheckCheck if the guide bearing is worn. If wear is significant, it can be repaired and polished before continued use. If it is damaged following an accident, it will need to be replaced. The summary is this: as long as it doesn't burn out, you can continue to use it.