Precautions for mining submersible pumps, and what should be paid attention to when using submersibl

Mining submersible pumps are mainly used for the drainage of the first pump room of the coal mine, the rescue drainage or the re-mining drainage after the flooding disaster of the coal mine, and the centrifugal pump is commonly used. When using the mining submersible pump, it is necessary to avoid frequently opening and closing the mining submersible pump.

The working environment of the mining submersible pump is relatively harsh, and in the process of use, we must try to avoid damage to the pump or its parts due to human error.

1. Do not open or close the mining submersible pump frequently. The interval between start and stop is relatively short, so that the start and stop will make the stator winding flow a large starting current from time to time, the winding is heated badly, and the heat is too late to dissipate, which causes the pump to heat excessively, and the stator winding may be burned out.

2. Be sure to use effective protection devices, such as overload protection and overheat protection.

3. The cable grounding wire is connected to the core wire incorrectly. Solution: Disassemble, repair, reinstall the stator winding, reconnect the cable, and carefully check whether the grounding wire and the core wire are connected correctly.

4. The cable joint is damaged. The stator winding is damp, which causes the insulation resistance to decrease, and the insulation breakdown between the turns of the winding line. Countermeasures: dismantle, overhaul, reinstall stator windings, and replace cables.

5. Take lightning protection measures to avoid damage to the underwater mining submersible pump caused by lightning accidents.

Precautions for installation of mining submersible pumps.

1. Before use, it should be confirmed that the power supply voltage is 5% of the rated voltage, and the voltage shall not fluctuate violently.

2. Before installation, fill the motor with clean water, and rotate the pump motor. Do antifreeze work;

3. Before the motor is used for the first time or after being placed for a long time, the motor insulation test should be done

4. The motor current should be controlled within the rated range (adjust the speed or valve) during operation, the current change should be observed at any time, and the record should be made, when the current fluctuates violently or rises and falls significantly, the motor should be stopped to check the motor insulation, water level and flow changes;

5. The interval between start-up and shutdown is 30 minutes.

6. Regular maintenance and inspection

The size of the current, the stability of the situation;

There is no sign of loosening or overheating in the connection of power cord and motor cord;

The control cabinet is well ventilated and there is no over-temperature condensation;

The pump runs smoothly without abnormal sound.

7. Overhaul: The pump should be overhauled regularly, replace the bearing sleeve, redo the motor cable joint, etc.

Manager Du of Tianjin Aote Pump Industry, look!

Hello pro i, I am happy to answer for you, the use of submersible pumps in coal mines should pay attention to the following matters: 1. Before use, it should be confirmed that the power supply voltage is at 5% of the rated voltage, and the voltage shall not fluctuate violently before the year, such as the voltage is unstable, you can choose to use the frequency conversion cabinet. 2. Before installation, fill the motor with clean water, and rotate the pump motor.

Do antifreeze work; 3. Before the motor is used for the first time or placed for a long time before use, the motor insulation should be tested: 4. The motor should be controlled to respond to the current within the rated range (adjust the speed or valve) during operation, and the current change should be observed at any time, and a record should be made, when the current fluctuates violently or rises and falls significantly, the motor insulation should be stopped to check the motor insulation, water level and flow changes; 5. The interval between start-up and shutdown is 30 minutes 6. Regular maintenance and inspection.

<> submersible pump works underwater, it is compact in structure, light in weight, and does not pump water from the well without a long transmission shaft. Therefore, the submersible pump is very suitable for rural well water irrigation, and the more widely used is the QW submersible pump. This kind of submersible pump adopts waterproof measures such as mechanical seal or air seal to keep the inside of the motor dry and free from water intrusion.

The following points should be paid attention to when using:

1) Check whether the sealing at the air vent, water drain hole, oil drain hole and cable joint of the submersible pump is loose, and if it is loose, it must be tightened.

2) Check the insulation resistance with a 500 volt shake meter, which should not be less than a megaohm, if it is lower than this value, open water, vent holes, and dry or sun-dry.

3) Check the submersible pump cable, if it is broken or broken, it should be replaced to avoid leakage.

4) Before starting the submersible pump, check all the circuits and switches to see if the wiring is correct and reliable, and then idle on the ground for 3 5 minutes (the time should not be too long, so as not to damage the parts or burn out the motor winding), and check whether the motor is correct.

5) When the submersible electric pump is put into the water, the cable must not be stressed, and the rope should be tied to the wooden frame of the wellhead. The maximum depth to which the electric pump is placed in the water is 3 meters, and the minimum depth is meters (from the center of the impeller).

6) During the operation of the submersible pump, the change of the water level in the well should be observed frequently, and the motor must not be exposed to the water surface, nor can it fall into the silt, so as not to affect the heat dissipation of the motor and burn out the winding. The electric pump should be raised and lowered at any time with the change of water level in the well, and if the water volume is reduced or interrupted, the cause should be immediately identified or stopped for inspection. The cable should not rub against the well wall, so as to avoid the well water from penetrating into the motor along the cable core after the cable is worn.

7) After 50 hours of use, check whether the seal is good, and check once a month in the future, and check whether the shielding sleeve between the rotor and stator of the motor is well sealed.

8) After one year of use, the rust of the submersible pump should be checked, and the rust should be removed and painted. If the submersible pump is not used for a long time, it should be carefully inspected and stored in a dry and ventilated house.

There are a few important points to pay attention to when using a submersible pump:

Confirm whether the power supply voltage and current meet the requirements: Before using the submersible pump, it is necessary to confirm whether the voltage and current of the power supply meet the requirements of the pump, so as to avoid damage or unstable operation of the pump due to power mismatch.

Choose the right pump well depth: The submersible pump is suitable for water wells of different depths, but you need to choose the right pump well depth according to the actual situation to ensure that the pump can work normally.

Check whether the pump body and cable are in good condition: Before using the air dispersion of the submersible pump, it is necessary to check whether the pump body is damaged or worn, and at the same time, it is also necessary to check whether the cable is in good condition to avoid problems such as leakage or power failure caused by damage.

Confirm whether the drainage pipeline is unblocked: Before starting the submersible pump, it is necessary to confirm whether the drainage pipeline is unblocked, so as to avoid abnormal or damaged operation of the pump due to pipeline blockage.

Regular maintenance and cleaning: After a period of use, the submersible pump needs to be maintained and cleaned regularly to ensure its normal operation and prolong its service life. Especially when dealing with water containing solid particles, it is necessary to clean the inside of the filter screen and pump body regularly to avoid wear and failure of the pump caused by particulate matter.

Comply with safety operation procedures: When using submersible pumps, it is necessary to comply with relevant safety operation procedures to avoid personal injury and equipment damage caused by improper operation. At the same time, it is necessary to pay attention to the working status of the pump at any time during use, and stop using it in time if there is any abnormality and check the cause.

1. The mining submersible pump works underwater, which is easy to leak electricity, causing power loss and even electric shock accidents. If it is equipped with a leakage protector, as long as the leakage of the submersible pump exceeds the relative value (generally not more than 30 mA), the leakage protector will cut off the power supply of the submersible pump to avoid leakage and waste of electric energy and ensure safety.

2. Do not turn on the power supply voltage abnormally, the submersible pump must observe the power supply voltage value at any time during operation, if it is less than 10% of the rated voltage and more than 10% of the rated voltage, the electric orange machine should be stopped running, find out the cause of the Yuanzeshan and eliminate the fault.

3. Do not frequently switch the mining submersible pump, this is because the submersible pump will produce backflow when it stops, and if it is turned on immediately, the motor load will start, resulting in excessive starting current and burning out the winding. Due to the high current at start-up, frequent start-up will also burn out the motor windings of the mining submersible pump. Ali 02

4. At present, there are many pump motors that can produce water in both forward and reverse rotation, but the water output is small and the current is large when reversing, and the motor winding will be damaged after a long time, so the correct rotation direction of the pump motor should be confirmed and the motor should not be reversed.

1. Before using this product, you must carefully read the instruction manual of this product and the instruction manual of related supporting equipment! In the process of installation, use and maintenance, strictly follow the safety operation procedures of this product and its related equipment!

2. The electrical control system of the electric pump should be equipped with overheating or overcurrent protection devices, and leakage protection devices should be equipped if necessary.

3. The start-up protection and mining mobile cable and the motor for the mine flameproof submersible electric pump connected outside the pump must be a product with the qualification of coal safety mark, and live operation is strictly prohibited during wiring to prevent electric shock.

4. It is forbidden to use cables for hoisting! Failure to do so will cause damage to the device.

5. The electric pump should be connected according to the provisions of the phase sequence identification, and the direction of the electric pump must be consistent with the steering sign. The four-core cable is black and the ground wire must be reliably grounded. Before use, it should be checked that the insulation resistance of the stator winding to the casing is not less than 200 megaohms.

6. The place where the electric pump is used should be set up with a warning sign of "strictly forbidden to enter to prevent electric shock", and it is strictly forbidden to move the electric pump when the electric pump is running, and it is strictly forbidden to open it with electricity.

7. It is forbidden for the motor to run in reverse! Reversing may cause damage to the device; After confirming that the steering is correct, the operation can be started.

8. When the electric pump is transported to Changliang, the following situations should be stopped immediately for inspection, and the fault can be eliminated before it can be operated

a) The thermal insulation resistance is less than 6 trillion ohms, and the cold insulation resistance is less than 200 trillion ohms;

b) When the unit makes abnormal noise or strong vibration during operation;

c) The water output of the electric pump is seriously insufficient or does not produce water;

d), three-phase power supply has phase failure;

e) When the power supply voltage is unstable or the operating current is greater than the rated value.

9. During the installation, maintenance and maintenance of the electric pump, it is strictly forbidden to open it with electricity! It is strictly forbidden to damage the explosion-proof surface!

10. The yield strength of the fastener is 640MPa.

1.When installing the mine explosion-proof submersible pump, the cable should be overhead, and the power cord should not be too long. When the unit is launched, do not stress the electric gear including the sail cable, so as not to cause the power cord to break. Do not sink into the mud for mine explosion-proof submersible pumps, otherwise it will lead to poor heat dissipation and burn out the motor windings.

2.Do not let the mine explosion-proof submersible pump run for a long time to overload the hail, do not pump water with large sand content, and the dewatering operation time of the mine explosion-proof submersible pump should not be too long, so as not to overheat the motor and burn out. During the operation of the unit, the operator must observe whether the working voltage and current are within the value specified on the nameplate at any time, and if it does not meet the requirements, the motor should be stopped to find out the cause and eliminate the fault.

3.When purchasing an explosion-proof submersible pump for mining, you should pay attention to its model, flow rate and head. If the selected specifications are not appropriate, it will not be able to obtain enough water output and the efficiency of the unit will not be exerted.

In addition, the direction of rotation of the motor should also be clarified, some types of mine explosion-proof submersible pumps can produce water when they rotate and reverse, but the water output is small and the current is large when reversing, and its reversal will damage the motor winding. In order to prevent the mine explosion-proof submersible pump from leaking electricity and causing electric shock accidents when working underwater, a leakage protection switch should be installed.

4.Try to avoid turning on the machine at low pressure. The power supply voltage can not differ from the rated voltage by 10%, the voltage is too high will cause the motor to overheat and burn out the winding ALI04, the voltage is too low to reduce the speed of the motor, if it does not reach 70% of the rated speed, the starting centrifugal switch will be closed, resulting in the start winding long time energized and heating and even burning out the winding and capacitor.

1. The submersible pump must not be dehydrated. Even if it is idling, it should not exceed 3 minutes, otherwise the motor may be burned. There is also the fact that the removal of the water surface may expose the water pump to the surface of the water, which is absolutely unacceptable.

2. Once the submersible pump is shut down, remember not to restart it immediately, and need to wait for the water to return to the pipeline, otherwise mechanical failure will easily occur.

3. The head is very critical, it must be used within the range of the suction head, and if it exceeds the suction head, it will not be able to absorb water and cause the pump to run dry.

4. Do not pull the wire when placing and taking out the submersible pump, you need to put down or pull it up with a rope, and it is very likely that the wire insulating sleeve will be damaged if you pull the wire directly.

5. If there is sludge in the working environment, the pump must not be placed in the sludge, and the pump must not be placed horizontally, which is not allowed.

6. If there are weeds or sand in the water, the pump must be covered with a filter screen, otherwise it is easy to be blocked.

7. After starting, there may be a reversal of the impeller, and it is necessary to stop the machine for repair in time.

The correct way to use a water pump is as follows:

1. The submersible pump can not be dehydrated, if it is tested under waterless conditions, the time shall not exceed 5 minutes, in the pumping process, if the water level continues to drop, it must be noted that the pump body can not be exposed to the water surface to work;

2. The submersible sewage pump can not be started immediately after the shutdown, and must wait for the water in the pipe to be returned to the pipe before it can be started, if the water can not be started after starting, it should be stopped immediately to find out the cause and eliminate it;

3. It should be used near the specified head, and the inner diameter of the supporting rubber pipe, iron pipe or canvas pipe should meet the technical requirements;

4. When the submersible pump is put into the water or raised to the water surface, the lifting rope must be pulled, and the cable must not be pulled.

5. The diving depth of the submersible sewage pump is generally to meters, and the submersible pump should be lifted vertically when diving into the water, and it cannot lie horizontally, let alone fall into the mud;

6. The submersible pump should not be started frequently, and should not be used for drainage and irrigation of water with high sand content before the pump, and the outside of the pump can be covered with bamboo mesh or barbed wire to prevent weeds in the water from blocking the submersible pump grid or jamming the pump impeller;

7. After starting, if the impeller reverses, it should be stopped immediately and any two of the three-phase cores in the cable should be replaced to make it turn out of the water.