Pump maintenance professional analysis
2019-09-15 10:04:58
Now we have a detailed analysis of the pump maintenance knowledge for you by the Lebang pump manufacturer.
1. How long does the grease in the water pump bearing need to be replaced? For bearings, lubrication is an important issue in their performance. The appropriateness of the lubricant or lubrication will greatly affect the life of the bearing. If the bearing is using a high-grade grease, it can run for 15000 hours or two years under normal operating conditions. For pumps with a motor power greater than 18.5 kW or in unfavorable conditions such as in an industrial environment with high ambient temperature, high humidity, dust, and aggressiveness, the bearings should be inspected in advance, and if necessary, a replacement of the grease can be scheduled for 5,000 hours. The amount of grease filling varies with the structure and volume of the housing, and it is usually 1/3-1/2 of the filling volume. When the amount of filling is excessive, the grease deteriorates due to stirring and heat, aging and softening.
2. Several errors in the maintenance of mechanical seals The greater the amount of spring compression, the better the sealing effect. Actually, excessive spring compression can lead to rapid wear of the friction pair and instant burnout. Excessive compression causes the spring to lose its ability to adjust the end face of the moving ring, resulting in failure of the seal.
The tighter the dynamic ring seal, the better. In fact, the dynamic ring seal is too harmful and unhelpful. One is to intensify the wear between the seal ring and the sleeve and cause premature leakage; the other is to increase the axial adjustment of the moving ring and the resistance of the movement. When the working conditions change frequently, it cannot be timely adjusted; third, the spring is fatigued and easily damaged; The deformation of the dynamic ring seal affects the sealing effect.
The tighter the ring seal, the better. The static ring seal is basically in a stationary state, and the relatively tight seal effect is better, but too tight is also harmful. One is caused by excessive deformation of the static ring seal, affecting the sealing effect; Second, if the static ring material is graphite, generally more brittle, excessive stress can easily cause fragmentation; Third, the installation, removal difficult, very easy to damage the static ring.
The tighter the impeller locks, the better. Leakage between shaft sleeves and shaft (leakage between shafts) is common in mechanical seal leakage. It is generally believed that the leakage between the shafts means that the impeller is not locked. In fact, there are many factors that lead to leakage between shafts. For example, the inter-shaft mat fails, there is misalignment between the shafts, and there are impurities in the shafts. The shaft and shaft sleeves have large shapes. Bit error, failure of the contact surface, gaps between the parts on the shaft, and excessive shaft thread length can cause shaft leakage. Locking the female lock excessively will only lead to premature failure of the inter-shaft pad. On the contrary, it will properly lock the lock mother so that the inter-axis pad always maintains a certain compression elasticity. In operation, the mother lock locks automatically and timely so that the shaft is always in good condition. The sealed state.
The new one is better than the old one. Relatively speaking, the effect of using a new mechanical seal is better than the old, but the quality or material selection of the new mechanical seal is not appropriate, and the larger dimensional error will affect the sealing effect; in polymeric and permeable media, the static ring will not be excessive. Worn, or not replaced as well. Because the stationary ring is in a stationary state for a long time in the stationary ring seat, the polymer and the impurities are deposited as a whole, which plays a good sealing role.
3 use the bearing should pay attention to the following matters:
Bearings are precision parts, and therefore require a very careful attitude when used, that is, the use of high-performance bearings, if not used, can not achieve the desired performance results, and easy to damage the bearings.
First, to maintain the cleanliness of the bearing and its surrounding environment Even if the invisible dust is invisible to the naked eye, it will increase the bearing wear, vibration and noise.
Second, the use of installation should carefully and carefully do not allow strong punching, do not allow hammer directly hit the bearing, does not allow the transfer of pressure through the rolling body.
Third, the use of appropriate and accurate installation tools to use special tools as much as possible, and strive to avoid the use of cloth and short fibers and the like.
Fourth, to prevent the corrosion of the bearing directly to take the bearing by hand, to fully wash the hands of sweat, and painted with high-quality mineral oil before operation, in the rainy season and summer especially pay attention to rust.
1, in addition to the use of water pumps in strict accordance with the installation instructions, but also pay attention to two points:
One is not to rely solely on "experience." For example, when a water pump leaks at the end of the valve, some operators will save time. Before each start-up, fill some dry soil with the inlet pipe, and then flush the soil with the soil to prevent the bottom valve from leaking. This method looks simple and easy, but it is not enough. Because when the water pump starts to work, sand in the bottom valve will enter the pump with water, wear the impeller, pump casing and shaft, etc., seriously affect the service life, the correct method should be to repair the bottom valve, it can not be repaired ,replace.
The second is to find out that the fault should be eliminated in a timely manner, and do not allow the unit to "sick" work. For example, when the shaft of the water pump is found to be heavily worn, it is necessary to increase the packing in time, otherwise it will cause leakage of the water pump shaft packing. Leakage of the water pump shaft packing not only makes the unit energy consumption is too large, but there will be cavitation, speed up the damage of the impeller, directly affect the service life of the water pump. For another example, if the pump is found to be vibrating violently, it should be stopped and checked immediately. Otherwise, if the water pump is bent and deformed, a safety accident is likely to occur.
2. After the water pump unit and the pipeline are in use for a certain period of time, the pump maintenance work should be done well (1) The water left in the water pump and the pipeline should be drained.
(2) If the disassembly is convenient, the water pump and piping can be removed and cleaned.
(3) Check the ball bearings, such as inner wear, turbulence, ball wear, or spotted surfaces. Can be used to clean the bearing with gasoline or kerosene and butter.
(4) Check whether there are any cracks or small holes in the impeller. If the impeller fixing nut is loose, repair it or replace it if it is damaged. Check the clearance at the wear ring of the impeller. If it exceeds the specified value, it should be repaired or replaced.
(5) If neither the water pump nor the pipeline is disassembled, apply a cover to seal the outlet to prevent debris from entering.
(6) When the transmission tape is not in use, the tape should be removed, cleaned with warm water and then stored in a location where there is no direct sunlight, and it should not be stored in areas with oil, corrosion, and smog. In any case, do not allow the tape to be stained with oil, diesel oil, or gasoline, and do not coat the tape with rosin and other sticky substances. Before using the tape, remove the powder from the tape contact surface.
(7) Wash all screws and bolts with a wire brush, and apply oil or immersed in diesel oil.
In short, in addition to its use in strict accordance with the instructions, it is also necessary to do a good job of repairing and maintaining the pump so as to extend the service life of the pump.
Author: Liang Bang pump manufacturers
1. How long does the grease in the water pump bearing need to be replaced? For bearings, lubrication is an important issue in their performance. The appropriateness of the lubricant or lubrication will greatly affect the life of the bearing. If the bearing is using a high-grade grease, it can run for 15000 hours or two years under normal operating conditions. For pumps with a motor power greater than 18.5 kW or in unfavorable conditions such as in an industrial environment with high ambient temperature, high humidity, dust, and aggressiveness, the bearings should be inspected in advance, and if necessary, a replacement of the grease can be scheduled for 5,000 hours. The amount of grease filling varies with the structure and volume of the housing, and it is usually 1/3-1/2 of the filling volume. When the amount of filling is excessive, the grease deteriorates due to stirring and heat, aging and softening.
2. Several errors in the maintenance of mechanical seals The greater the amount of spring compression, the better the sealing effect. Actually, excessive spring compression can lead to rapid wear of the friction pair and instant burnout. Excessive compression causes the spring to lose its ability to adjust the end face of the moving ring, resulting in failure of the seal.
The tighter the dynamic ring seal, the better. In fact, the dynamic ring seal is too harmful and unhelpful. One is to intensify the wear between the seal ring and the sleeve and cause premature leakage; the other is to increase the axial adjustment of the moving ring and the resistance of the movement. When the working conditions change frequently, it cannot be timely adjusted; third, the spring is fatigued and easily damaged; The deformation of the dynamic ring seal affects the sealing effect.
The tighter the ring seal, the better. The static ring seal is basically in a stationary state, and the relatively tight seal effect is better, but too tight is also harmful. One is caused by excessive deformation of the static ring seal, affecting the sealing effect; Second, if the static ring material is graphite, generally more brittle, excessive stress can easily cause fragmentation; Third, the installation, removal difficult, very easy to damage the static ring.
The tighter the impeller locks, the better. Leakage between shaft sleeves and shaft (leakage between shafts) is common in mechanical seal leakage. It is generally believed that the leakage between the shafts means that the impeller is not locked. In fact, there are many factors that lead to leakage between shafts. For example, the inter-shaft mat fails, there is misalignment between the shafts, and there are impurities in the shafts. The shaft and shaft sleeves have large shapes. Bit error, failure of the contact surface, gaps between the parts on the shaft, and excessive shaft thread length can cause shaft leakage. Locking the female lock excessively will only lead to premature failure of the inter-shaft pad. On the contrary, it will properly lock the lock mother so that the inter-axis pad always maintains a certain compression elasticity. In operation, the mother lock locks automatically and timely so that the shaft is always in good condition. The sealed state.
The new one is better than the old one. Relatively speaking, the effect of using a new mechanical seal is better than the old, but the quality or material selection of the new mechanical seal is not appropriate, and the larger dimensional error will affect the sealing effect; in polymeric and permeable media, the static ring will not be excessive. Worn, or not replaced as well. Because the stationary ring is in a stationary state for a long time in the stationary ring seat, the polymer and the impurities are deposited as a whole, which plays a good sealing role.
3 use the bearing should pay attention to the following matters:
Bearings are precision parts, and therefore require a very careful attitude when used, that is, the use of high-performance bearings, if not used, can not achieve the desired performance results, and easy to damage the bearings.
First, to maintain the cleanliness of the bearing and its surrounding environment Even if the invisible dust is invisible to the naked eye, it will increase the bearing wear, vibration and noise.
Second, the use of installation should carefully and carefully do not allow strong punching, do not allow hammer directly hit the bearing, does not allow the transfer of pressure through the rolling body.
Third, the use of appropriate and accurate installation tools to use special tools as much as possible, and strive to avoid the use of cloth and short fibers and the like.
Fourth, to prevent the corrosion of the bearing directly to take the bearing by hand, to fully wash the hands of sweat, and painted with high-quality mineral oil before operation, in the rainy season and summer especially pay attention to rust.
1, in addition to the use of water pumps in strict accordance with the installation instructions, but also pay attention to two points:
One is not to rely solely on "experience." For example, when a water pump leaks at the end of the valve, some operators will save time. Before each start-up, fill some dry soil with the inlet pipe, and then flush the soil with the soil to prevent the bottom valve from leaking. This method looks simple and easy, but it is not enough. Because when the water pump starts to work, sand in the bottom valve will enter the pump with water, wear the impeller, pump casing and shaft, etc., seriously affect the service life, the correct method should be to repair the bottom valve, it can not be repaired ,replace.
The second is to find out that the fault should be eliminated in a timely manner, and do not allow the unit to "sick" work. For example, when the shaft of the water pump is found to be heavily worn, it is necessary to increase the packing in time, otherwise it will cause leakage of the water pump shaft packing. Leakage of the water pump shaft packing not only makes the unit energy consumption is too large, but there will be cavitation, speed up the damage of the impeller, directly affect the service life of the water pump. For another example, if the pump is found to be vibrating violently, it should be stopped and checked immediately. Otherwise, if the water pump is bent and deformed, a safety accident is likely to occur.
2. After the water pump unit and the pipeline are in use for a certain period of time, the pump maintenance work should be done well (1) The water left in the water pump and the pipeline should be drained.
(2) If the disassembly is convenient, the water pump and piping can be removed and cleaned.
(3) Check the ball bearings, such as inner wear, turbulence, ball wear, or spotted surfaces. Can be used to clean the bearing with gasoline or kerosene and butter.
(4) Check whether there are any cracks or small holes in the impeller. If the impeller fixing nut is loose, repair it or replace it if it is damaged. Check the clearance at the wear ring of the impeller. If it exceeds the specified value, it should be repaired or replaced.
(5) If neither the water pump nor the pipeline is disassembled, apply a cover to seal the outlet to prevent debris from entering.
(6) When the transmission tape is not in use, the tape should be removed, cleaned with warm water and then stored in a location where there is no direct sunlight, and it should not be stored in areas with oil, corrosion, and smog. In any case, do not allow the tape to be stained with oil, diesel oil, or gasoline, and do not coat the tape with rosin and other sticky substances. Before using the tape, remove the powder from the tape contact surface.
(7) Wash all screws and bolts with a wire brush, and apply oil or immersed in diesel oil.
In short, in addition to its use in strict accordance with the instructions, it is also necessary to do a good job of repairing and maintaining the pump so as to extend the service life of the pump.
Author: Liang Bang pump manufacturers
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