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Analysis and solution of common faults of magnetic coupling - pump

What if the magnetic pump encounters problems? Here is the solution.

(1) The magnetic pump shaft is broken. The material of the pump shaft of the magnetic pump is 99% aluminum oxide porcelain. The main reason for the fracture of the pump shaft is that the shaft is twisted due to the dry grinding of the bearing when the pump is running empty. When the pump is disassembled for inspection, it can be seen that the bearing is seriously worn and the main way to prevent the pump from breaking is to avoid the pump from idling.

(2) The magnetic centrifugal pump bearing is damaged. The bearing of the magnetic pump is made of high-density carbon. If the pump is cut off or there are impurities in the pump, the bearing will be damaged. If the coaxiality requirements between the inner and outer magnetic rotors of the cylindrical coupling are not guaranteed, the service life of the bearing will also be directly affected.

(3) The magnetic centrifugal pump cannot pump liquid. The failure of magnetic pump to pump liquid is the most common failure of the pump, and there are many reasons. First of all, check whether there is air leakage in the suction pipe of the pump, check whether the air in the suction pipe is discharged, whether the amount of liquid filled in the magnetic pump is sufficient, whether there is debris blocking in the suction pipe, check whether the pump is reversed (especially after the motor is replaced or the power supply line is repaired), and pay attention to whether the suction height of the pump is too high. If the problem still cannot be solved through the above inspection, the pump can be disassembled for inspection to see whether the pump shaft is broken, and whether the dynamic and static rings of the pump are intact, and whether the whole rotor can move slightly axially. If the axial movement is difficult, check whether the carbon bearing is too tightly combined with the pump shaft. It is worth noting that the magnetic pump has been repaired several times and found no problem. Pay attention to whether the magnetic coupling works normally. The bearing, inner magnetic rotor and spacer sleeve will generate heat during operation, which will increase the working temperature, reduce the transmitted power on the one hand, and cause great trouble to the magnetic pump that transports easily vaporized liquid on the other hand. The power transmitted by the magnetic steel is a continuous decline curve with the increase of temperature. Generally, the decline of its transmission capacity is reversible below the working limit temperature of the magnetic steel, but irreversible above the limit temperature, that is, the lost transmission capacity can no longer be restored after the magnetic steel is cooled. In special cases, when the magnetic coupling slips (out of step), the eddy current heat in the spacer will increase sharply, and the temperature will rise sharply. If it is not handled in time, it will cause demagnetization of the magnetic steel and make the magnetic centrifugal pump coupling invalid. Therefore, the magnetic centrifugal pump should be designed with reliable cooling system. For the medium that is not easy to vaporize, the cooling circulation system generally leads out the liquid flow from the impeller outlet or pump outlet, and returns to the suction population through the bearing and magnetic drive part. For the medium that is easy to vaporize, the heat exchanger shall be added or the liquid flow shall be led to the storage tank outside the pump to avoid the heat returning to the suction population. For the medium with solid impurities or ferromagnetic impurities, the filter shall be considered, and for the high temperature medium, the cooling shall be considered, To ensure that the magnetic coupling does not exceed the operating limit temperature. When considering whether the rotational speed is enough, first check whether the rotational speed of the motor is normal. Use a tachometer to measure it. If the rotational speed of the motor is normal, consider whether the magnetic coupling will slip.

(4) The head is insufficient. The causes of this failure include: air in the conveying medium, damaged impeller, insufficient rotating speed, excessive specific gravity of the conveying liquid, and excessive flow.

(5) Insufficient flow. The main reasons for insufficient flow are: impeller damage, insufficient rotation speed, high head, debris blockage in the pipe, etc.