Learn how to use the submerged pump for sulphuric acid safely!
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Posted by sdbfsteel sdbfsteel - Filed in Business - 443 views
Submerged pump for sulphuric acid is widely used in sewage discharge in municipal engineering, factories, commerce, hospitals, hotels, residential areas, etc. due to its advantages of simple installation, small footprint, convenient maintenance, and no noise. In order to ensure the safe use of submerged pump for sulphuric acid, users must learn some safety protection points when using them. Let's talk about them in detail below.
1. It is forbidden to start the machine when the power supply voltage is abnormal
Because the low-voltage power supply line is relatively long, it is common for the voltage at the end of the line to be too low. When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the motor speed of the submersible pump will drop. When it does not reach 70% of the rated speed, the start centrifugal switch will be closed, causing the start winding to be energized for a long time and heat up or even burn out. windings and capacitors. On the contrary, the high voltage causes the motor to overheat and burn out the windings. Therefore, during the operation of the submersible pump, the operator must observe the power supply voltage value 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 eliminate the fault.
2. Confirm the correct rotation direction of the motor
The rotation direction of the motor should be clarified. Now there are many types of high-lift submersible pumps that can discharge water during forward rotation and reverse rotation, but the water output is small and the current is large during reverse rotation. The long reverse rotation time will damage the motor windings.
3. Cable installation and insulation resistance requirements of submersible pumps
When installing the submersible pump, the cable should be overhead, and the power cable should not be too long. Do not apply force to the cable when the submersible pump is launched or lifted, so as not to cause the power cord to break. Do not sink into the mud when the submersible pump is working, otherwise it will cause poor heat dissipation of the motor and burn the motor windings. During installation, the insulation resistance of the motor should not be lower than 0.5 megohms.
4. Avoid frequent switching
Do not turn on and off the submersible pump frequently, this is because the backflow will occur when the electric pump stops, and if it is turned on immediately, the motor load will start, resulting in excessive starting current and burning out the windings. Due to the large current at startup, frequent startup will also burn out the submersible pump motor windings.
5. Installation of leakage protector
Leakage protector is also called life saver, its function can be understood from the three words of life saver. Because the submersible pump works underwater, it is easy to leak electricity, resulting in power loss and even electric shock accidents. If a 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 supply of the submersible pump to ensure safety and avoid leakage and waste of electricity.
6. Prohibit long-term overloading of submersible pumps
In order to avoid the long-term overloading of the submersible pump, do not pump water with a large amount of sand and observe whether the current value is in the value specified on the nameplate at any time. If the current is found to be too large, it should be stopped for inspection. In addition, the dehydration time of the electric pump should not be too long, so as not to overheat the motor and burn it.
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