How to extend the life of submersible pumps?

1, confirm the correct direction of rotation of the motor should find out the direction of rotation of the motor, there are many types of submersible pumps forward and reverse can be out of water, but the reverse flow of water is small, the current is large, the long reversal time It will damage the motor windings.

2. Prohibition of abnormal power supply voltage boot Because the low voltage power supply line is relatively long, the voltage at the end of the line is often too low. When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the speed of the submersible pump motor decreases. When the rated speed is less than 70% of the rated speed, the starting centrifugal switch will close, causing the starting winding to be electrified for a long time and generate heat or even burn out. Windings and capacitors. Conversely, excessive voltage causes the motor to overheat and burn out the winding. Therefore, during the operation of the submersible pump, the operator must observe the power supply voltage at any time. If it is less than 10% of the rated voltage and more than 10% of the rated voltage, the motor should be stopped to find out the cause and remove the fault.

3. Insulation resistance of cable installation and submersible pump When installing a submersible pump, the cable should be overhead and the power cable should not be too long. When the submersible pump is launched into the water or raised, do not apply force to the cable to avoid breaking the power cord. Do not sink into the mud while the submersible pump is working, otherwise it will cause the motor to dissipate heat and burn out the motor winding. When installing, the insulation resistance of the motor should not be less than 0.5 megohms.

4. Leakage protector installation Leakage protector is also called life-sustainer. Its role can be understood from the word “life-saving device”. Because the submersible pump works underwater, it is easy to cause electrical loss due to electrical leakage and even cause electrical shock. If the leakage protector is installed, as long as the leakage value of the submersible pump exceeds the operating current value of the leakage protector (generally no more than 30 mA), the leakage protector will cut off the power of the submersible pump to ensure safety, while avoiding leakage and wasting electric energy.

5, to avoid frequent switching Do not frequently switch the submersible pump, this is because the electric pump will generate backflow when stopped, if the immediate start, the motor load will start, resulting in excessive starting current and burn out the winding. Due to the large current at start-up, frequent start-up can also damage the submersible pump motor windings.

6. Don't let the submersible pump work over a long period of time To avoid long-term over-load operation of the submersible pump, do not pump water with a large amount of sediment and observe at any time whether the current value is on the nameplate. If excessive current is found, stop the operation. an examination. In addition, the electric pump dehydration operation time should not be too long, so as not to make the motor overheated and burned.

7, pay attention to routine maintenance should always check the motor often, if found under the cover crack, rubber seal ring damage or failure, etc., should be promptly replaced or repaired to avoid water infiltration submersible pump.

Pay attention to the application of the submersible pump protector and pay attention to some daily protection, which can better extend the life of the submersible pump.