Magnetic pump can not hit the liquid is the most prone to failure of the pump, and the reasons are also more. First of all, we should check whether there is a leak in the suction pipe of the pump, check whether the air in the suction pipe is discharged, whether the amount of liquid injected in the magnetic pump is enough, whether there is debris in the suction pipe, we should also check whether the pump is reversed, and pay attention to whether the suction height of the pump is too high. If it can not be solved through the above inspection, the pump can be disassembled to check whether the pump shaft is broken, and the dynamic ring and static ring of the pump should be checked whether the whole rotor can move in a small amount of axial direction. If the axial movement is difficult, check whether the carbon bearing is too tightly combined with the pump shaft.

The material of the pump shaft of the magnetic pump is 99% alumina porcelain, and the main reason for the fracture of the pump shaft is that the shaft is broken because the pump is running empty and the bearing is dry ground. When the pump is disassembled, it can be seen that the bearing has been seriously worn. The main way to prevent the pump from breaking is to avoid empty operation of the pump.

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, it will cause damage to the bearing. If the coaxiality between the inner and outer magnetic rotor of the cylindrical coupling is not guaranteed, it will directly affect the life of the bearing.

The reasons for this failure are: there is air in the conveying medium, the impeller is damaged, the speed is not enough, the proportion of the conveying liquid is too large, and the flow is too large. The main causes of insufficient flow are: impeller damage, speed is not enough, head is too high, and there is debris in the tube.

The power transmitted by magnetic steel with the increase of temperature is a continuous decline curve, usually, below the working limit temperature of magnetic steel, the decline in its transmission capacity is reversible, and above the limit temperature is irreversible, that is, after the cooling of magnetic steel, the loss of transmission capacity can no longer be restored. Under special circumstances, when the magnetic coupling slips, the eddy current heat in the sleeve will increase sharply, and the temperature will rise sharply. If it is not treated in time, it will cause the magnetic steel to demagnetize and make the magnetic coupling fail. Therefore, the magnetic pump should design a reliable cooling system.

For the medium that is not easy to vaporize, the cooling circulation system generally leads the liquid flow from the impeller outlet or the pump outlet, and returns to the suction population through the bearing and magnetic transmission part. For the medium that is easy to vaporize, the heat exchanger should be added or the liquid flow should 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, filtration should be considered. For the high temperature medium, cooling should be considered. To ensure that the magnetic coupling does not exceed the working limit temperature.