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Posted - 09/06/2020 :  11:07:25  Show Profile  Reply with Quote
magnetic drive pump advantages and disadvantages

The magnetic drive pump uses the magnet to attract the ferromagnetic material and has the magnetic effect between the magnet or the magnetic field; the non ferromagnetic material does not affect or rarely affects the magnitude of the magnetic force, so it can carry out the power transmission through the non-magnetic conductor (isolation sleeve) without contact, this kind of transmission device is called the magnetic coupling. The motor is connected with the external magnetic steel through the coupling, and the impeller is connected with the internal magnetic steel. A fully sealed isolation sleeve is arranged between the outer magnetic steel and the inner magnetic steel to completely separate the inner and outer magnetic steel, so that the inner magnetic steel is in the medium, and the rotating shaft of the motor directly drives the impeller to rotate synchronously through the suction of the magnetic pole between the magnetic steel.

Its main advantages: because the transmission shaft does not need to penetrate into the pump housing, but uses the magnetic field to drive the inner rotor through the air gap and the thin-wall transmission torque of the isolation sleeve, so the leakage channel of the shaft seal is fundamentally eliminated, and the complete seal is realized; the transmission power has the function of overload protection; in addition to the high requirements of magnetic materials and magnetic circuit design, the technical requirements of other parts are not high; The workload of maintenance and repair of magnetic drive pump is small.

Its main disadvantages: the efficiency of the magnetic drive pump is lower than that of the ordinary centrifugal pump; the material and manufacturing requirements of the isolation sleeve against single side leakage are higher; because of the limitation of the material and magnetic drive, the magnetic drive pump is generally only used to transport the medium below 100 #8451; and 1.6Mpa in China; Due to the poor wear resistance of the isolation sleeve material, the magnetic drive pump is generally used to transport the medium without solid particles; the coupling has a high centring requirement, and the improper centring will lead to the damage of the bearing at the inlet and the wear of the isolation sleeve against single side leakage.

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