Reason for occurrence: There are foreign objects inside the pump; The pump bearing is locked due to high temperature; Friction between the inner and outer magnetic rotors and the sealing cover; Electrical faults, etc.
Solution: Remove foreign objects; Disassemble and clean; Disassemble and inspect the inner and outer magnetic rotors; Check the electrical components.
In addition to the common faults mentioned above, it should also be noted that when the magnetic gear pump has been inspected several times but no problems can be found, attention should be paid to whether the magnetic coupling is working properly. Bearings, inner magnetic rotors, and spacers all generate heat during operation, which will increase the working temperature. On the one hand, this will reduce the transmitted power, and on the other hand, it will cause great trouble for magnetic pumps that transport easily vaporized liquids. The power transmitted by magnetic steel follows a continuous decreasing curve with increasing temperature. Generally, below the working limit temperature of magnetic steel, the decrease in transmission capacity is reversible, while above the limit temperature, it is irreversible, meaning that the lost transmission capacity of magnetic steel cannot be restored after cooling. In special circumstances, when the magnetic coupling slips (loses step), the eddy current heat in the spacer will increase sharply, and the temperature will rise sharply. If not dealt with in time, it will cause demagnetization of the magnetic steel, resulting in the failure of the magnetic coupling. Therefore, a reliable cooling system should be designed for magnetic pumps.
For media with solid impurities or ferromagnetic impurities, filtration should be installed in the early stage. For high-temperature media, cooling should be considered to ensure that the magnetic coupling does not exceed the working limit temperature.
When considering whether the speed is sufficient, it is necessary to first check whether the speed of the motor itself is normal, which can be measured with a tachometer. If the motor speed is normal, it can be considered whether there will be slippage of the magnetic coupling.
