IS series single-stage single-suction centrifugal pump, due to design reasons, the rolling bearing used in the centrifugal pump is lubricated with oil, and the dynamic seal leakage is very serious, threatening the safe and stable operation of the equipment. The author has repeatedly sealed the bearing housing in several years of work. The small reform of the small leather has achieved certain results. However, the leakage problem has not been completely solved. After the practice, the oil is lubricated to lubricate the grease, and the effect is good.
Key words: centrifugal pump; lubrication; sealing; vibration of centrifugal pump The lubrication of rolling bearing is mainly to reduce the friction power consumption, reduce the wear rate, and also play the role of cooling, dustproof, rust and vibration absorption. Doing a good job of equipment lubrication is to ensure the normal operation of the equipment. Effective measures to reduce equipment wear, prevent equipment accidents, reduce power consumption, and extend repair cycle and service life.
The centrifugal pump used in the circulating water system of the roaster is a single-stage single-suction pump. The various technical parameters are as follows:
The model is IS150-125-250, the flow rate is 200m3/h, the head is 20m, the shaft power is 18.5kw, and the speed is 1450r/min.
This type of pump rolling bearing lubrication is lubricated by 30# (winter) or 40# (summer) mechanical lubricants. Due to design reasons, the leakage of the dynamic seal is very serious, which not only causes a large amount of oil to be wasted, the bearing burns out, but also pollutes the environment, which is not conducive to the safe operation of the equipment and civilized production. In the work of several years, in order to solve this problem, the small reforms were carried out several times.
1. The process of lubrication mode transformation 1.1 felt seal changed to single-layer skeleton oil seal The original bearing box seal is sealed with felt. The leakage is very serious. The fuel consumption of each pump is about 300kg/a, which causes a lot of oil to be wasted, and the oil on the ground is thick.
In order to change this oil leakage condition, change the felt seal to the skeleton seal as follows:
1 The inner and outer end caps of the bearing housing are machined, and a round hole of Φ65mm and depth of 12mm is arranged for the frame to fit a frame oil seal of 45mm×60mm×12mm.
2 Remove the felt and gently insert the skeleton oil seal with a hammer and install it properly.
After the transformation, the equipment is operating normally, the vibration displacement is about 0.04mm, and the external temperature of the bearing is about 50°C. The annual consumption of oil per pump is only about 50kg. The pump room is kept clean and hygienic, and the bearing and shaft damage accidents caused by lack of oil are prevented, and the equipment is running well.
1.2 Single-layer skeleton oil seal is changed to double-layer skeleton oil seal In order to reduce the leakage amount, according to the structure of the bearing box end cover, a modification scheme is proposed, and the inner hole of the bearing box end cover is processed into a Φ65mm through hole. Change the single-layer skeleton oil seal to double-layer skeleton oil seal:
The trial run shows that this method is very effective in preventing oil leakage in the short term. However, after 6 months of continuous operation, the leakage of the skeleton oil seal will increase.
2, the defective seal skeleton <br> <br> felt seal to the seal, the use of 4a, although the effect is better, but there are significant drawbacks.
In actual work, because the skeleton oil seal has a short life and needs to be replaced frequently, when the skeleton oil seal is replaced, the equipment needs to be completely disassembled, on the one hand, the labor intensity of the worker is increased, and on the other hand, in the process of dismantling and repairing the equipment, the impeller is sometimes caused. Damage to parts such as bearings does not meet the economic management requirements of the equipment, but if the oil seal is not changed, it will cause leakage, which is not conducive to sealing, and also directly affects bearing life. In short, practice has proved that the skeleton oil seal does not completely solve the oil leakage problem of the bearing housing of this structure.
3, instead of lubricating grease <br> <br> present, nor cheap seal leaks yet, some good sealing effect, but the price is expensive, economically unviable. After investigation and research, it was decided to test the boldness - lubricating with grease instead of lubricating oil.
3.1 The transformation method takes into account that the pump shaft power is only 18.5kw, the flow rate is only 200m3/h; the pump speed is 1450r/min, and the line speed is 3.4m/s. From the above two points, lubrication with grease is feasible.
3.2 The specific method is as follows: 1 The oil in the fuel tank is released, and the bearing housing is cleaned.
2 Open the end cover and the oil drain hole at both ends of the bearing housing to remove the air inside the box.
3 Use a grease gun to fill the lithium grease from the oil filler hole to the bearing housing, add the grease from the two end caps and the oil drain hole, and consider it to be full, and tighten the bearing end cover and the oil drain hole plug. . Use the hand-cranked car to distribute the grease evenly inside the box.
After starting the pump, open the outlet valve to operate the pump under normal conditions, and monitor the bearing temperature and oil quality at both ends of the pump. The temperature was monitored with an infrared thermometer as shown in Table 1:
Table 1 bearing temperature with running time change running time / h inner bearing temperature / ° C outer bearing temperature / ° C room temperature / ° C
0.17404135
0.33424435
0.50444735
0.67475035
0.83495335
1505435
2505435
10505334
240455032
720444931
After the transformation, the vibration displacement is about 0.04mm.
The grease oil quality is good, no change, the pump is running normally. It can be seen from the temperature monitoring data and the vibration monitoring data that it is feasible to replace the lubricating oil with grease, which can be promoted and used on the same type of pump.
3.3 Grease lubrication effect Grease is not easy to leak, which is beneficial to the lubrication of water pump bearings, ensuring safe and stable operation of the pump, greatly reducing the amount of fuel and the number of refueling. Not only save fuel, but also reduce the labor intensity of workers. Specifically:
1 save oil costs. The consumption of lubricating grease is 9kg/a per pump and the cost is 63 yuan/a. The oil consumption is 4kg/month under the condition of the skeleton oil seal, and the cost is 200 yuan/a. Each pump can save 137 yuan / a, greatly reducing the cost of lubrication.
2 reduce maintenance costs. The average life of the skeleton oil seal is 4 months. In order to replace the skeleton oil seal, it needs to be dismantled and repaired about 3 times a year, and it is changed to lithium grease lubrication to reduce labor costs. Material and mechanical costs, and avoid damage to equipment parts during maintenance.
3 extended the equipment operating cycle. From vibration. Temperature and other aspects of monitoring, the use of grease sealing performance, bearing good operation, extending the life of the bearing.
4 improved the job environment.
4. Conclusion <br> <br> In short, instead of mechanical lubricating grease, such low speed, small flow water pump is feasible, and there is a clear economic and environmental benefits, the equipment is economically reasonable An effective measure of operation.
Key words: centrifugal pump; lubrication; sealing; vibration of centrifugal pump The lubrication of rolling bearing is mainly to reduce the friction power consumption, reduce the wear rate, and also play the role of cooling, dustproof, rust and vibration absorption. Doing a good job of equipment lubrication is to ensure the normal operation of the equipment. Effective measures to reduce equipment wear, prevent equipment accidents, reduce power consumption, and extend repair cycle and service life.
The centrifugal pump used in the circulating water system of the roaster is a single-stage single-suction pump. The various technical parameters are as follows:
The model is IS150-125-250, the flow rate is 200m3/h, the head is 20m, the shaft power is 18.5kw, and the speed is 1450r/min.
This type of pump rolling bearing lubrication is lubricated by 30# (winter) or 40# (summer) mechanical lubricants. Due to design reasons, the leakage of the dynamic seal is very serious, which not only causes a large amount of oil to be wasted, the bearing burns out, but also pollutes the environment, which is not conducive to the safe operation of the equipment and civilized production. In the work of several years, in order to solve this problem, the small reforms were carried out several times.
1. The process of lubrication mode transformation 1.1 felt seal changed to single-layer skeleton oil seal The original bearing box seal is sealed with felt. The leakage is very serious. The fuel consumption of each pump is about 300kg/a, which causes a lot of oil to be wasted, and the oil on the ground is thick.
In order to change this oil leakage condition, change the felt seal to the skeleton seal as follows:
1 The inner and outer end caps of the bearing housing are machined, and a round hole of Φ65mm and depth of 12mm is arranged for the frame to fit a frame oil seal of 45mm×60mm×12mm.
2 Remove the felt and gently insert the skeleton oil seal with a hammer and install it properly.
After the transformation, the equipment is operating normally, the vibration displacement is about 0.04mm, and the external temperature of the bearing is about 50°C. The annual consumption of oil per pump is only about 50kg. The pump room is kept clean and hygienic, and the bearing and shaft damage accidents caused by lack of oil are prevented, and the equipment is running well.
1.2 Single-layer skeleton oil seal is changed to double-layer skeleton oil seal In order to reduce the leakage amount, according to the structure of the bearing box end cover, a modification scheme is proposed, and the inner hole of the bearing box end cover is processed into a Φ65mm through hole. Change the single-layer skeleton oil seal to double-layer skeleton oil seal:
The trial run shows that this method is very effective in preventing oil leakage in the short term. However, after 6 months of continuous operation, the leakage of the skeleton oil seal will increase.
2, the defective seal skeleton <br> <br> felt seal to the seal, the use of 4a, although the effect is better, but there are significant drawbacks.
In actual work, because the skeleton oil seal has a short life and needs to be replaced frequently, when the skeleton oil seal is replaced, the equipment needs to be completely disassembled, on the one hand, the labor intensity of the worker is increased, and on the other hand, in the process of dismantling and repairing the equipment, the impeller is sometimes caused. Damage to parts such as bearings does not meet the economic management requirements of the equipment, but if the oil seal is not changed, it will cause leakage, which is not conducive to sealing, and also directly affects bearing life. In short, practice has proved that the skeleton oil seal does not completely solve the oil leakage problem of the bearing housing of this structure.
3, instead of lubricating grease <br> <br> present, nor cheap seal leaks yet, some good sealing effect, but the price is expensive, economically unviable. After investigation and research, it was decided to test the boldness - lubricating with grease instead of lubricating oil.
3.1 The transformation method takes into account that the pump shaft power is only 18.5kw, the flow rate is only 200m3/h; the pump speed is 1450r/min, and the line speed is 3.4m/s. From the above two points, lubrication with grease is feasible.
3.2 The specific method is as follows: 1 The oil in the fuel tank is released, and the bearing housing is cleaned.
2 Open the end cover and the oil drain hole at both ends of the bearing housing to remove the air inside the box.
3 Use a grease gun to fill the lithium grease from the oil filler hole to the bearing housing, add the grease from the two end caps and the oil drain hole, and consider it to be full, and tighten the bearing end cover and the oil drain hole plug. . Use the hand-cranked car to distribute the grease evenly inside the box.
After starting the pump, open the outlet valve to operate the pump under normal conditions, and monitor the bearing temperature and oil quality at both ends of the pump. The temperature was monitored with an infrared thermometer as shown in Table 1:
Table 1 bearing temperature with running time change running time / h inner bearing temperature / ° C outer bearing temperature / ° C room temperature / ° C
0.17404135
0.33424435
0.50444735
0.67475035
0.83495335
1505435
2505435
10505334
240455032
720444931
After the transformation, the vibration displacement is about 0.04mm.
The grease oil quality is good, no change, the pump is running normally. It can be seen from the temperature monitoring data and the vibration monitoring data that it is feasible to replace the lubricating oil with grease, which can be promoted and used on the same type of pump.
3.3 Grease lubrication effect Grease is not easy to leak, which is beneficial to the lubrication of water pump bearings, ensuring safe and stable operation of the pump, greatly reducing the amount of fuel and the number of refueling. Not only save fuel, but also reduce the labor intensity of workers. Specifically:
1 save oil costs. The consumption of lubricating grease is 9kg/a per pump and the cost is 63 yuan/a. The oil consumption is 4kg/month under the condition of the skeleton oil seal, and the cost is 200 yuan/a. Each pump can save 137 yuan / a, greatly reducing the cost of lubrication.
2 reduce maintenance costs. The average life of the skeleton oil seal is 4 months. In order to replace the skeleton oil seal, it needs to be dismantled and repaired about 3 times a year, and it is changed to lithium grease lubrication to reduce labor costs. Material and mechanical costs, and avoid damage to equipment parts during maintenance.
3 extended the equipment operating cycle. From vibration. Temperature and other aspects of monitoring, the use of grease sealing performance, bearing good operation, extending the life of the bearing.
4 improved the job environment.
4. Conclusion <br> <br> In short, instead of mechanical lubricating grease, such low speed, small flow water pump is feasible, and there is a clear economic and environmental benefits, the equipment is economically reasonable An effective measure of operation.
The Laser Distance Meter is precise measuring tools with high accuracy and 100m long distance. The laser distance measurer can be used indoor and outdoors. It's widely used in many areas, specially in construction industry, thanks to the IP54 dust and water resistant. The digital height measurement device
Why Our 100m Laser Distance Measurer?
1. Long range: 0.03-100m.
2. High Accuracy. The accuracy can achieve ±1.5 mm.
3. Multiple Functional Designs: can be used to measure distance, area, volume, angle, and Pythagorean measurement. Also can add function: Bluetooth, USB charge, voice, touch screen etc.
4. IP54 waterproof rating and dustproof
Laser Distance Meter 100M,Laser Meter 100M,Laser Measure 100M Range,100M Laser Distance Meter
Chengdu JRT Meter Technology Co., Ltd , https://www.cdlaserrangfinder.com