It is worth noting that the magnetic pump has been repaired several times and no problem can be found, and attention should be paid to whether the magnetic coupling is working normally. The bearing, inner magnetic rotor and spacer 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 magnetic pump that transports easily vaporized liquid.
The power transmitted by the magnetic steel is a continuous decreasing curve with the increase of temperature. Generally, the decrease of the transmission capacity is reversible below the working limit temperature of the magnetic steel, and irreversible above the limit temperature, 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. 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 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.
When considering whether the rotational speed is sufficient, first check whether the rotational speed of the motor itself is normal, which can be measured by a tachometer. When the rotational speed of the motor is normal, it can be considered whether there will be a slip of the magnetic coupling.
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