Inside and outside of submersible pump are different
Submersible pump is characterized by built-in submersible pumps and exterior submersible pumps, then what different places do they have to make people distinguish it out.
Built-in submersible pump, which in the motor base outside another electric pump shell to surround it, the motor base and the pump shell can be made into one, into a ring structure, and then install the pump outlet cover. The liquid flows through the circular space between the submersible pump housing and the motor base, and then cools the surface of the motor base directly and flows out through the aqueduct. Built-in submersible pump motor cooling effect is better, suitable for large areas of the ground in the occasion, long-term use of good results, high reliability.
Outside submersible pump, installed in the motor outside the water pipe as a water flow, the liquid directly from the pump connected to the drainage pipe, not through the motor surface, its cooling than the built-in submersible pump to be worse.
In summary, the difference between built-in and exterior submersible pumps is also very large and can be easily identified. Due to the poor cooling performance of the exterior submersible pump, it needs to be improved and made it in a large area Drain, the motor exposed to the surface, the cooling effect becomes better.
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Prevent submersible pump malfunction
Submersible pump is an important equipment for deep wells, the whole unit should be submerged into the water. But what are the problems with submersible pumps?
Submersible pump for the vertical arrangement, the pump and the motor coaxial, so that the weight of the rotating parts and impeller to withstand the same direction of water pressure; Second, the submersible pump is used in the liquid, the transport of sewage media containing impurities, Material; Third, the submersible pump is a kind of centrifugal pump, in its operation, the power is always increased with the increase in traffic, when the flow exceeds the design flow and reach a certain value, the motor will be burned due to overload.
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Submersible pump industry development features is not obvious
Any industry development will have its own industry characteristics, our submersible pump industry is no exception. Now we analyze the submersible pump industry development characteristics and a future development direction.
The first is the area. In the world, the wells with submersible pump manufacturers are mainly concentrated in Europe and the United States, China, India and other countries, in terms of China, mainly concentrated in Shandong, Zhejiang, Guangzhou and other provinces, Zhejiang Wenling submersible pump industry is the most concentrated, Wenling City production and sales accounted for about 60% of the country.
Cyclical. The production and sales of submersible pumps are affected by changes in the overall economy and the disposable income of the residents. But the submersible pump to meet people’s basic production and living needs, but also a relatively rigid demand, cyclical changes are not very obvious.
Seasonal. Well submersible pumps are widely used in the production and living water, agriculture and forestry irrigation and factories, mine water supply and drainage and other fields, does not have obvious seasonal.
Then the future development of submersible pumps are: new technology, the continuous use of new materials, design will tend to more efficient, energy saving, environmental protection direction, the overall design to the modular design of the detachable development direction.
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Why Submersible pump current is too large?
Submarine pump use stability will affect the efficiency of drainage, submersible pump current stability control is to maintain its smooth work of the necessary measures. However, the use of submersible pumps will inevitably occur in point problems, such as the ammeter in the operation of the pointer swing, so why has these problems? How to solve them?
The reason why submersible pump has the above situation as following:
1.Due to the moving water level down below to the water level, causing the pump gap water. The main reason is that the submersible pump flow is too large or the depth of the well is not enough. The measures that should be taken are:
①First,turn down the valve on the water pipe, reducing the flow of the pump, so that the moving water level down, submersible pump inlet is always located under the water.
②Increase the submersible pump downhole depth to the moving water level decline, the submersible pump inlet is always located under the water.
2.Another reason is the submersible pump rotor damage caused by the motor can not work properly, resulting in decreased speed, pump flow, lift reduced, so the ammeter pointer swing. At this point the treatment is to replace the rotor.
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The cause of submersible pump burned out
1. The ground wire is connected to the wrong power source. There are four cores in the cable of the submersible pump. Be careful not to connect the ground wire as a power cord.
2. Submersible pump mechanical seal damage and leakage. Often use megger to check the submersible pump insulation resistance, the occurrence of insulation resistance is reduced in time to take maintenance measures, it will not happen to burn the motor.
3. After the cable is damaged. Always check the insulation resistance of the submersible pump.
4. Impeller stuck. When the impeller is locked, the current increases over the rated value for a long time, and the stator windings of the submersible pump will burn out soon.
5. Stator windings at both ends of the shell. Winding to ground breakdown.
6. Submersible pump “open”, “stop” too often.
7. Submersible pump dehydration running time is too long. Submersible pump dehydration running time can only be about 1 minute time, a long time, the pump due to poor heat and temperature rise.
8. Lack of work. In the absence of work, the submersible pump is generally in the braking state, the current is much larger than the rated value, when the submersible pump winding temperature increases, if last for a long time, it will burn the stator windings.
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Application of Cutting Submersible Pump in Naphthenic Acid Plant
Cutting submersible sewage pump is very important to our lives, recently it has adopted a new technology, according to the characteristics of naphthenic device production, the piston-type vacuum pump to switch cutting submersible sewage pump, and cutting submersible sewage pump. The application of some of the problems in the corresponding transformation. Here to tell you about it.
1.Production and operation practice shows that the transformation effect is good for the cutting submersible sewage pump equipment, the smooth production and cost reduction and laid a solid foundation.
2. One of the core equipment of the naphthenic acid plant is a cutting submersible sewage pump, which removes air or other gases from the reactor-vacuum still or the closed vessel receiving tank and pulls out the neutral oil High purity naphthenic acid.
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Smoking and fuel injection problems of submersible pump
In the course of operation, if operate improperly, submersible pump is often faulty. Such as submersible pump vacuum drop, fuel injection, smoke, oil spills and other phenomena, if your equipment has such a situation, please do not worry, we help you analyze the relevant knowledge and reasons.
1.Smoking, it is normal if the submersible pump begain to run and smoke. But it is abnormal if smoke for a long time.
Solution: smoking shows that submersible pump inlet has repairation situation, including the pipeline, valves, containers. After the leak, the smoke will end.
2.Fuel injection, it means there is a large number of leaks outside the intake, or even the atmosphere exposed.
Solution: Seal the submersible pump inlet to make it operate, if not spray, then there is a leak; check if the exhaust valve is damaged, replace the bad exhaust valve.
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Removal of sewage pump rust
If Sewage pump placed for a long, it will be very prone to rust, and will impact our normal use. Nanjing Forever Sewage Treatment Equipments Co., LTD. tells you some tips about removing sewage pump rust:
1.If don’t not use in a long time, release water in the sewage pump cavity, and dry pump chamber with a dry cloth. If the inside of the pump chamber is not dry, the pump chamber will rust for a long time.
2.Artificial remove rust will be the least cost with most provincial insurance. We can use our own tools to get rid of the rust, we man-made remove rust, do not need to use other chemical products so that can save some costs. Why is it insurance? Because if use chemical to remove rust, pump cavity will be more or less damaged.
3.Derusting with rust remover: This measure can remove rust completely but pump chamber will be damaged.
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Explosion proof grade requirements of submersible pumps
The submersible pump will become explosion-proof submersible pump when equipped with explosion-proof motor, motor explosion can be divided into D2BT4 (solid explosion) and D2CT4 (gas explosion). No matter what explosion-proof way is to prevent the use of the pump when the sparks occurred accident, now let’s share explosion-proof submersible pump explosion-proof grade requirements.
Explosion-proof requirements of explosion-proof submersible pumps: This requires the use of electrical equipment under the conditions specified in the design and manufacture, in the above-mentioned explosive with the occasion, even if the equipment failure, will not cause the surrounding explosive The gas environment is ignited and exploded.
To make the submersible motor has a certain explosion-proof performance, can adapt to the explosive environment in the use of requirements, to be submersible motor structure, parts manufacturing materials and manufacturing processes, and other specialized measures to be guaranteed. Explosion-proof submersible pump is in the ordinary submersible sewage pump on the basis of optimization and improvement, submersible submersible submersible submersible pump submersible motor based on the use of explosion-proof motor, pump outside the cable leads to the use of explosion-proof head, its role in the conductive part of the explosive medium, or to prevent dangerous sparks and localized heating of conductive parts that may be in contact with explosive mixtures.
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Submersible pump debugging steps
Do you know submersible pump debugging steps?Let’s share with you!
A. Over-current and overload debugging:
The thermal relay current adjustment knob, and slowly to less than the actual operating current direction of rotation, each rotation a little scale, interval 2-5 minutes until the thermal relay action unit to stop working so far. And then reverse the rotation can be a little scale;
B. The lack of phase sensitivity debugging:
The unit to start again, and one by one off the unit knife switch fuse, the unit in two-phase power state. Observe whether the thermal relay can cut off the control power within 5 seconds;
C. Short-circuit test:
This step is usually dependent on the power supply system to protect the air switch. Generally do not make field tests (more dangerous) requires the power supply system must be equipped with air switch (air switch model preferred DW10 type, DZ type is the second choice).
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