First, mechanical seal overhaul: The tighter the static ring seal, the better. The static ring seal is basically at rest, and the relatively tight seal will be better, but too tight is also harmful. First, the static ring seal is caused by excessive deformation, which affects the sealing effect. Second, if the static ring material is graphite, it is generally brittle, and excessive force is easy to cause chipping. Third, it is difficult to install and disassemble, and it is easy to damage the static ring. The tighter the moving ring seal is, the better. In fact, the dynamic ring seal is too tight and harmful. First, the wear between the seal ring and the bushing is intensified, and the leakage is premature; secondly, the resistance of the moving ring in the axial adjustment and movement is increased, and the adjustment cannot be made timely when the working conditions change frequently; the third is that the spring is excessively fatigued and easily damaged; It is to deform the moving ring seal and affect the sealing effect. The tighter the impeller lock is, the better. In mechanical seal leaks, leakage between the bushing and the shaft (interaxial leakage) is more common. It is generally believed that the leakage between the shafts is that the impeller locks are not locked. In fact, there are many factors causing leakage between the shafts, such as the failure of the inter-axis pads, the offset, the impurities between the shafts, and the larger shape of the shaft and the sleeve. Position errors, contact surface damage, gaps between components on the shaft, and excessive length of the shaft threads can cause leakage between the shafts. Excessive locking of the lock nut will only lead to premature failure of the inter-axis pad. On the contrary, the lock nut is moderately locked, so that the inter-axis pad always maintains a certain compression elasticity. During operation, the lock nut will automatically lock in time, so that the shaft is always in good condition. Sealed state. The new one is better than the old one. Relatively speaking, the effect of using a new mechanical seal is better than that of the old one, but the quality or material selection of the new mechanical seal is not appropriate. The large dimensional error will affect the sealing effect; in the polymerizable and permeable medium, the static ring is not excessive. Wear or not replace it as well. Because the static ring is in a static state for a long time in the static ring seat, the polymer and impurities are deposited as one body, which has a good sealing effect. 1. Check the ball bearings, such as inner casing wear, sway, ball wear or spots on the surface should be replaced. The bearings can be cleaned with gasoline or kerosene and then greased. 2. If the disassembly is convenient, the submerged pump and pipeline can be removed and cleaned. 3. Dispense the remaining water in the pump and tubing. 4. If the submerged pump and piping are not removed, apply a cover to seal the outlet to prevent debris from entering. 6. Brush all screws and bolts with a wire brush and apply oil or dipped in diesel to store. 7. When the drive tape is not in use, remove the tape, wipe it with warm water, store it in a place where there is no direct sunlight, and do not store it in places with oil, corrosives and smoke. Under no circumstances should the tape be stained with oil, diesel or gasoline, and do not apply rosin and other viscous materials to the tape. Before using the tape, remove the white powder from the contact surface of the tape. In addition to strictly in accordance with the instructions, you should also do a good job of repair and maintenance of the submerged pump, in order to extend the life of the submerged pump. Third, the use of the submerged pump in addition to strictly in accordance with the instructions for use, should also pay attention to the following points: First, it is forbidden to rely solely on "experience." For example, when the submerged pump leaks in the bottom valve, some of the robots save trouble. Before each boot, first fill the inlet pipe with some dry soil, then fill the water to flush the bottom valve, so that the bottom valve does not leak. This method seems simple and easy, but it is not enough. Because when the submerged pump starts to work, the sand in the bottom valve will enter the pump with water, wear the impeller, pump casing and shaft, etc., which seriously affects the service life. The correct method should be to overhaul the bottom valve. Repaired, replaced. The second is to find out the faults should be eliminated in time, and should not let the crew work with the disease. For example, if the underfill pump shaft packing is seriously worn, it is necessary to increase the packing in time, otherwise the liquid pump shaft packing will leak. The leakage of the submerged pump shaft packing not only makes the unit consume too much energy, but also cavitation, accelerates the damage of the impeller, and directly affects the service life of the submerged pump. For example, if the submerged pump is found to vibrate violently, it should be stopped immediately, otherwise it is very likely that a safety accident will occur if the submerged pump is bent and deformed. Fourth, the grease in the bearing of the submerged pump is replaced: Concerned about surprises Label: Underwater pump operation and maintenance Previous: Ultrasonic cleaning system common problems Next: Centrifugal pump common conditioning method Weigh 100-1000g Electronic Scales Weigh 100-1000G Electronic Scales,Weight Scale,Electronic Weighing System,Digital Measuring Cup Scale Shanghai Liuyuan Trading Co. , Ltd. , https://www.ly-weighing.com
The greater the amount of spring compression, the better the sealing effect. In fact, if the spring compression amount is too large, the friction pair may be sharply worn and burned instantaneously; excessive compression causes the spring to lose the ability to adjust the end face of the moving ring, resulting in seal failure.
Second, the submerged pump unit and pipeline after a period of use after the submerged pump maintenance work:
5. Inspect the impeller for cracks or small holes, and if the impeller fixing nut is loose, repair or replace if damaged. Check the clearance at the impeller reducing ring. If it exceeds the specified value, it should be repaired or replaced.
For bearings, lubrication is an important issue for performance. The suitability of the lubricant or lubrication method will greatly affect the life of the bearing. If the bearing is made of high grade grease, it can run for 15,000 hours or two years under normal operating conditions. For submerged pumps with motor power greater than 18.5 KW or under adverse conditions such as high ambient temperature, high air humidity, high dust, and aggressive industrial environment, the bearings should be inspected in advance, and if necessary, 5,000 hours of grease replacement can be arranged. The amount of grease filling varies with the structure and volume of the casing, and is generally filled to 1/3-1/2 of the volume. When the filling amount is too much, the grease deteriorates due to stirring and heating, aging and softening. 