QR code|Site map| Contact Feiyue Welcome to Jiangsu Feiyue Machine Pump Group Co., Ltd.

Jiangsu Feiyue Machine And Pumps Group Co., Ltd.

National Service Hotline:400-0523-588

Hot key words:Petrochemical pumpBB3S series horizontal open pumpHigh temperature pumpHigh temperature hot water circulation pumpFTLM desulfurization pumpFZBM series thermal insulation wear-resistant slurry pumpLJYA series slurry pumpHigh temperature and high pressure magnetic pump

CURRENT LOCATIONHome > Evaporative concentration > Nonferrous metallurgy

Magnetic pump maintenance instructions

Back to list Originate: Browse: Release date:2018/3/15 9:52:07【Big In Small

1) Shaft break

    The material of the pump shaft of the magnetic pump is 99% alumina ceramics. The main reason for the pump shaft to break is because the pump runs dry and the shaft is twisted due to dry grinding of the bearings. When disassembling the pump, you can see that the bearing has been worn seriously. The main way to prevent the pump from breaking is to avoid the pump from idling.

    (2) Bearing damage

     The material of the bearing of the magnetic pump is 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 requirement between the inner and outer magnetic rotors of the cylindrical coupling is not guaranteed, it will directly affect the life of the bearing.

    (3) Insufficient head

    The reasons for this failure are: there is air in the transport medium, the impeller is damaged, the speed is not enough, the proportion of the transported liquid is too large, and the flow rate is too large.

    (4) Insufficient flow

    The main causes of insufficient flow are: impeller damage, insufficient speed, excessive head, clogged debris in the tube, etc.

    (5) The magnetic pump cannot produce liquid.

    The failure of the magnetic pump to produce liquid is the most prone failure of the pump, and there are many reasons. First, check the pump's suction line for leaks, check whether the air in the suction pipe is exhausted, whether the amount of liquid filled in the magnetic pump is sufficient, whether there is debris in the suction pipe, and check whether the pump is reversed (Especially after changing the motor or after repairing the power supply line), you should also pay attention to whether the suction height of the pump is too high. If the above inspection still cannot be solved, the pump can be disassembled and inspected to see if the pump shaft is broken. It should also be checked whether the moving ring and static ring of the pump are intact, and whether the whole rotor can move a little axially. If the axial movement is difficult, check whether the carbon bearing is too tightly coupled with the pump shaft. It is worth noting that the magnetic pump has been repaired several times and the problem cannot be found. It should be noted whether the magnetic coupling is working properly. Bearings, internal magnetic rotors and spacers will generate heat during operation, which will increase the operating temperature, on the one hand, reduce the power transmitted, on the other hand, it will cause great trouble to the magnetic pump that transports easily vaporized liquid. The power transferred by the magnetic steel is a continuous decreasing curve with the increase of temperature. Generally, the reduction of the transmission capacity below the working limit temperature of the magnetic steel is reversible, and above the limit temperature is irreversible, that is, the cooling of the magnetic steel After that, the lost transmission capacity can no longer be recovered. Under special circumstances, when the magnetic coupling slips (out of step), the heat of the eddy current 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 coupling invalid. Therefore, the magnetic pump should design a reliable cooling system. For the medium that is not easy to vaporize, the cooling circulation system generally draws the liquid flow from the outlet of the impeller or the pump outlet, and returns to the suction population through the bearing and the magnetic transmission part. For the medium that is easy to vaporize, a heat exchanger should be added or the liquid flow should be led outside the pump The storage tank should avoid the heat from returning to the suction. For media with solid impurities or ferromagnetic impurities, filtration should be considered, and 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 rotation speed is enough, first check whether the rotation speed of the motor itself is normal, and can be measured with a tachometer. When the rotation speed of the motor is normal, it can be considered whether the magnetic coupling will slip off. . After repairing it several times, no problem can be found, and it should be noted whether the magnetic coupling is working properly. Bearings, internal magnetic rotors and spacers will generate heat during operation, which will increase the operating temperature, on the one hand, reduce the power transmitted, on the other hand, it will cause great trouble to the magnetic pump that transports easily vaporized liquid. The power transferred by the magnetic steel is a continuous decreasing curve with the increase of temperature. Generally, the reduction of the transmission capacity below the working limit temperature of the magnetic steel is reversible, and above the limit temperature is irreversible, that is, the cooling of the magnetic steel After that, the lost transmission capacity can no longer be recovered. Under special circumstances, when the magnetic coupling slips (out of step), the heat of the eddy current 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 coupling invalid. Therefore, the magnetic pump should design a reliable cooling system. For the medium that is not easy to vaporize, the cooling circulation system generally draws the liquid flow from the outlet of the impeller or the pump outlet, and returns to the suction through the bearing and the magnetic transmission part. For the medium that is easy to vaporize, a heat exchanger should be added or the liquid flow should be led outside the pump The storage tank should avoid the heat from returning to the suction. For media with solid impurities or ferromagnetic impurities, filtration should be considered, and 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 rotation speed is enough, first check whether the rotation speed of the motor itself is normal, and can be measured with a tachometer. When the rotation speed of the motor is normal, it can be considered whether the magnetic coupling will slip off.