IS series single-stage single suction centrifugal pump, due to design reasons, the centrifugal pump used in rolling bearing oil lubrication, dynamic sealing leak is very serious, threatening the safe and stable operation of the device, the author in a few years of work, the bearing box sealed several times Small change small leather have achieved some results. However, the problem of leakage has not been completely solved, and after practice, oil lubrication changed to grease lubrication, the effect is good. Centrifugal pump lubrication is mainly to reduce friction friction, reduce wear rate, but also play a cooling, dust, rust and vibration absorption and so on. Do a good job of equipment lubrication is to ensure the normal operation of equipment. Reduce equipment wear and tear, prevent equipment accidents, reduce power consumption, extend the repair cycle and service life of effective measures. Centrifugal pumps used in roaster circulating water system are single-stage single-suction pumps. Various technical parameters are as follows: Model IS150-125-250, flow rate 200m3 / h, lift 20m, shaft power 18.5kw, speed 1450r / min. This type of pump roller bearing lubrication is 30 # (winter) or 40 # (summer) mechanical lubrication. Due to the design reasons, the dynamic seal leakage is very serious, which not only causes a great deal of wasted oil, burns out the bearings, but also pollutes the environment, which is not conducive to the safe operation of equipment and civilized production. In the course of several years of work, in order to solve this problem, many minor changes have been made. 1, the course of the transformation of lubrication 1.1 felt seal instead of a single skeleton oil seal bearing seal is sealed with felt. Leakage is very serious, each pump fuel consumption of about 300kg / a, resulting in a large number of oil waste, a thick layer of oil on the ground. In order to change the situation of oil leakage, change the felt seal to the skeleton seal as follows: ①The inner and outer end caps of the bearing box are machined to produce a circular hole of Φ65mm and 12mm deep, which is suitable for placing a hole of 45mm × 60mm × 12mm The skeleton oil seal. ② remove the felt, the skeleton seal gently hit into with a hammer, and the correct installation. After transformation, the equipment is operating normally, the vibration displacement is about 0.04mm, and the temperature outside the bearing is about 50 ℃. The annual oil consumption of each pump is only about 50kg. Maintains the cleanliness of the pump room, put an end to the bearings, shaft damage due to lack of oil, the operation of the equipment intact. 1.2 single-layer skeleton oil seal into a double-layer oil seal In order to reduce the amount of leakage, according to the bearing housing cover structure, and put forward a transformation program, the bearing housing end hole processing Φ65mm through-hole. The single-layer skeleton oil seal into a double-layer skeleton seal test run shows that this method to prevent oil spills in the short term is very effective. However, continuous operation for 6 months, due to the skeleton oil seal wear will increase the amount of leakage. 2, the defects of the skeleton oil seal The felt seal into a skeleton oil seal, the use of 4a, although the effect is better, but there are obvious shortcomings. In actual work, because the skeleton oil seal has a short service life, it needs to be replaced frequently. When the skeleton oil seal is replaced, all the equipment needs to be disassembled to increase the labor intensity of the worker. On the other hand, during the disassembly and maintenance process of the equipment, impellers, Bearings and other parts of the damage, does not meet the requirements of economic management equipment, but if you do not change the oil seal, resulting in leakage, is not conducive to sealing, but also directly affect the bearing life. In short, the practice proved: skeleton oil seal did not completely solve the problem of oil leakage bearing housing. 3, grease instead of lubricating oil At present, cheap and no leak seal yet, some sealing effect, but expensive, economically unfeasible. After investigation, decided to boldly test - use grease instead of lubricating oil to lubricate. 3.1 Transformation Method Taking into account the pump shaft power is only 18.5kw, the flow rate is only 200m3 / h; pump speed of 1450r / min, linear speed of 3.4m / s. From the above two point of view, with grease lubrication is feasible. 3.2 The specific methods are as follows ①the oil tank let go, the bearing box for cleaning. ② the bearing housing at both ends of the end cap and oil drain plug open, to exclude the air inside the box. ③ with a grease gun lithium grease from the filling hole to the bearing box filled, added to the grease from both ends of the cover and put the oil hole extrusion, as full, and tighten the bearing cover and oil drain plug . Hand crank, the grease evenly distributed in the box. After starting the pump, open the outlet valve, so that the pump is running under normal conditions, monitoring the bearing temperature and oil conditions at both ends of the pump. Infrared thermometer to monitor the temperature, the data shown in Table 1: Table 1 bearing temperature changes with the running time Running time / h Inner bearing temperature / ℃ Outside bearing temperature / ℃ Room temperature / ℃ 0.17 40 41 35 0.33 42 44 35 0.50 44 47 35 0.67 47 50 35 0.83 49 53 35 1 50 54 35 2 50 54 35 10 50 53 34 240 45 50 32 720 44 49 31 After the transformation of the vibration displacement of about 0.04mm. Grease oil quality is good, no change, the pump is operating normally, from the temperature monitoring data and vibration monitoring data can be seen, the grease instead of lubricating oil is feasible, to promote the use of the same type of pump.
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