News Digest:Nine tips of submersible dredge pump maintenance, Do pump offers submersible dredge pump, which is also called heavy duty agitator pump, submersible sand pump, submersible dredge pump, or submersible sludge pump, which can handle sand, gravel, rock, solid
Nine tips of submersible dredge pump maintenance:
Do pump offers submersible dredge pump, which is also called heavy duty agitator pump, submersible sand pump, submersible dredge pump, or submersible sludge pump, which can handle sand, gravel, rock, solid with water dredging and piping.
1. The dis-assembly method of the submersible dredge pump should be correct: Before dis-assembly, mark the joint between the front and rear end caps and the base with a pair of tweezers. Because the assembly of the motor at the factory is quite reasonable, if it is not assembled as it is after repair, it may cause a slight error and cause the shaft to be less flexible. When disassembling, carefully observe the degree of burnout of the windings, and initially analyze the cause of the burnout. Pay attention to the faults that are easy to see, such as slight brooms and ball breaks. If the rust is serious, do not harden the hard smashing. You can use the method of gas welding to heat the joints. While heating, use a hammer to tap and use the principle of heat rise to remove it with “Lama” or tweezers.
When removing the submersible electric dredge pump and clicking on the bad winding, pay attention to protect the iron core and the plastic retainer. If the method is not suitable, it may cause the iron core to rise and be damaged. When the motor is energized, it may generate electromagnetic effects, causing the iron core to vibrate and the winding itself to vibrate, which may easily cause insulation damage of the insulating paper and the electromagnetic wire. The method of thread removal is to cut from one end face with a diagonal pliers and the other end with a pliers.
2. Homemade wire molds should be combined: the ruled lines should be correct. After embedding one phase, another phase is embedded so that the ends form a "three-layer plane", and the ends must be tightly wrapped to prevent scratching during assembly.
3. To adjust the position of the "limit screw", carefully and carefully, the rotor is free to rotate, and the no-load current is the best. Then be sure to tighten the lock nut.
4. The waterproof insulation of the joint should be handled. The sheath and the insulation layer are peeled off at the joint, and the paint layer and the oxide layer on the surface of the copper wire are removed, and the solder is soldered after being spliced. Then remove the sharp corners, burrs and soldering fluid, and use a polyethylene strip with a half stack of 6 layers, and then use a layer of polyester tape to make a layer of 2 layers as a mechanical protective layer.
5. Insulating paint method on the coil of the submersible dredge pump motor. After the motor is finished, the insulation paint should be applied after shaping. The correct method of painting is to immerse the entire wire stator of the motor in an insulating varnish and take it out for 0.5 h. Some repair shops usually use a brush to apply insulating varnish on the stator. Because the insulating varnish has a certain viscosity, the permeability and uniformity are poor, which makes the process of the upper insulating varnish fail to meet the specified quality requirements.
6. The temperature and time of baking the varnished stator should be appropriate. The purpose of baking the stator is to dry the insulating varnish and remove the moisture and moisture between the stator coil wires. The correct baking method is: the stator is placed in an oven (furnace) for baking, the temperature is raised to 110-120 ° C for 12 h, the heat is kept and cooled with the oven (furnace) for 12 h (wires of different seasons and different qualities, There are differences in temperature and time requirements). Some repair shops often have large discounts on baking temperature and time. The general baking temperature is 60-80 ° C, the time is 4-6 h, and some even do not heat-treat, which causes the moisture and moisture in the stator coil can not be exhausted. , so that the quality of the motor does not meet the requirements.
7. Filling the mechanical oil should pay attention to the quality of the oil-immersed motor repair, should be filled in the gap between the stator and the rotor, No. 5 (or No. 10) new mechanical oil, and some repair shops often mix new and old mechanical oil , reducing the quality of mechanical oil, affecting the use of the motor in the future.
8. The insulation resistance of the motor winding to the casing meets the requirements. The insulation resistance (cold) value of the winding to the casing after the stator is oiled can be measured by a 500v voltmeter, which should be no less than 1 oomω, and the oil-immersed motor after repairing the household is rarely It is not uncommon for insulation resistance to be less than 5m12, especially in rainy and humid seasons. Insulation resistance value is too low, it is easy to cause electric shock accidents, and must not be taken lightly.
9. The integral sealed box should be inspected and repaired regularly: The integral sealed box is the key sealing component of the submersible dredge pump, and its technical status will directly affect the normal operation of the motor. After the submersible dredge pump runs 5mω, it should be lifted to the ground for inspection. The inspection methods and requirements are as follows:
A small amount of oil is drained from the oil hole in the lower end cap of the motor to see if there is any moisture in the oil. If the water content in the oil does not exceed 5ml, the seal is normal and can be used continuously, and will be checked once a month. If the water content exceeds 5ml after 50h of operation, the water should be drained, the oil should be filled up, the screw plug should be tightened, and then run for 50 hours for the second inspection. If the water content is less than 5ml, it can be used continuously, and will be checked once a month as described above. If the water content is greater than 5 ml, there is a problem with the seal. If there is water in the top cover oil, it indicates that the first pair of grinding blocks are leaking or the lower sealing rubber ring is damaged; if there is water in the oil in the lower cover, the second pair of grinding blocks is leaking or the lower rubber ring is damaged. At this time, the leaking abrasive block and the damaged rubber seal ring should be treated or replaced. For the integral sealed box that is repaired or will be replaced, a pneumatic test must be performed to check for air leaks. If there is a leak, reinstall or replace the sealed box and dry or dry the motor. Finally, inject new oil from the upper and lower oil holes.
Nine tips of submersible dredge pump maintenance:
For more information, contact us at info@dopumpgroup.com or call dredge pump for sale at +8615031104888.
