Submersible pump maintenance should pay attention to what matters?

Submersible pump maintenance should pay attention to the matter:

1. Submersible pump disassembly method to be correct: before demolition to the end cover and the base of the sewn with prickly heat marked. Because the motor assembly at the factory is quite reasonable, if not repaired as it is assembled, it may cause slight error and cause the shaft to be less flexible. Be careful to observe the degree of burnout when demolished, a preliminary analysis of the reasons for burning, pay attention to a slight sweep bore, ball rupture and other easy to see the fault. Such as serious corrosion, not hard hit hard 铳, gas welding heat seam can be used at the joint method, while heating with a hammer tap, the use of heat up principle with "Rama" or prickly heat removed.

In the repair submersible pump click bad winding, pay attention to protect the core and plastic retainer. If the method is not suitable, it may cause the core up and disability, the motor may produce electromagnetic effects when energized so that the core vibration, the winding itself vibration, it is likely to cause insulation paper, wire insulation damage. The stitching method is to use the diagonal pliers to cut off from one end face, and to pliers out the other end.

2. Homemade line to fit: embedding to be correct. To embed a phase, and then embedded in another phase, so that the end of the formation of "three-tier plane," the end must be tightly wrapped to prevent scratches in the assembly.

3. To adjust the position of the "limit screw" should be carefully adjusted to achieve rotor rotation freely, and no-load current is the best state. Then be sure to tighten the lock nut.

4. Waterproof insulation joints to deal with the joints peel off the jacket and insulation, and remove the copper surface paint, oxide layer, twisted after the soldering. And then remove the sharp corners, burrs and soldering liquid, with a half-stack of polyethylene tape 6 layers, and then use polyester tape half-stack 2 layers, as a mechanical protective layer.

5. Submersible pump motor coil insulation paint method Motor under the line, after setting the insulating paint. The correct coating method is: the entire motor stator embedded immersion insulating paint lasted 0.5h removed. However, some repair shops usually use a brush brush to apply insulating paint on the stator. Since the insulating paint has a certain viscosity, the permeability and the uniformity are poor, which makes the process of insulating paint fail to meet the required quality requirements.

6. Baking varnish stator temperature and time To properly bake the stator is intended to dry the insulation paint and remove the stator coil wire moisture and moisture. The correct method of baking is as follows: the stator is baked in an oven (oven), the temperature is raised to 110 to 120 DEG C for 12 hours, the temperature is kept and cooled with the oven for 12 hours (different seasons, different quality wires, There are differences in temperature and time requirements). And some repair shop often in the baking temperature and time on the large discount bar, the general baking temperature is 60 ~ 80 ℃, time is 4 ~ 6h, and some do not even heat treatment, resulting in the stator coil moisture and moisture can not drive , Leaving the quality of the motor does not meet the requirements.

7. Fill mechanical oil to pay attention to quality Oil-immersed motor repair, should be in its stator, rotor all gaps in the 5th (or 10) new mechanical oil, and some repair shop often new and old mechanical oil mixture , Reducing the quality of mechanical oil, affecting the use of the motor in the future.

8. Insulation resistance of the motor windings on the enclosure meets the requirements Insulation resistance (cold state) of the windings on the enclosure after the stator oil injection can be measured with a voltmeter of 500v, which should not be less than 1oomω, and very few oil-immersed motors are repaired after renovations Have reached the value of this regulation, especially in the wet and humid season, the insulation resistance of less than 5m12 is also not uncommon. Insulation resistance is too low, easy to cause electric shock accident, must not be taken lightly.

9. Integral sealed box to be regularly checked and repaired: Integral sealed box is the key seal submersible pump components, the technical status of the good or bad, it will directly affect the motor can operate normally. Submersible pump operation 5mω, it should be put on the ground for inspection. Inspection methods and requirements are as follows:

Release a small amount of oil from the filler hole on the lower end cap of the motor to see if there is any moisture in the oil. If the oil in the water does not exceed 5ml, indicating that the seal is normal, can continue to use, check once a month later. If the operation 50h, the water content of more than 5ml, the water should be drained, the oil enough, the refueling larvae l screw tighten, and then run 50h, for the second inspection. If the water content is less than 5ml, you can continue to use, after a month as described above check. If the water content is more than 5ml, there is a problem with the seal. If there is water in the cover oil, it indicates that the first pair of grinding blocks are leaking or the lower sealant ring is damaged; if there is water in the lower cover, the second pair of grinding blocks leaks or the lower rubber ring is damaged. At this time, the leaky grinding block and the damaged rubber seal should be handled or replaced. After the repair or replacement of the sealed box, you must do the pressure test to check for any leaks. If the leak, to be re-install or replace the sealed box, and the motor drying or drying. Finally, from the top and bottom of the hole will be new oil

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