It is worth noting that after the pump has been repaired several times, no problem can be found, and attention should be paid to whether the magnetic coupling is working normally.
Bearings, inner magnetic rotors and spacers will generate heat during operation, which will increase the working temperature, on the one hand, the transmitted power will decrease, and on the other hand, it will cause great trouble to the pump that transports easily vaporized liquids.
The power transmitted by the magnetic steel is a continuously decreasing curve with the increase of temperature. Generally, below the working limit temperature of the magnetic steel, the decrease of its transmission capacity is reversible, but above the limit temperature, it is irreversible, that is, the cooling of the magnetic steel. After that, the lost transmission capacity can never be recovered.
Under special circumstances, 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 the magnetic steel to demagnetize and make the magnetic coupling invalid. Therefore, the magnetic pump should be designed with a reliable cooling system. For the medium that is not easy to vaporize, the cooling circulation system generally leads the liquid flow from the outlet of the impeller or the pump, and returns to the suction port 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 out of the pump To avoid the heat returning to the suction port, for the medium 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.
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