According to the production process conditions and the characteristics of the medium, the domestic magnetic pump model CQB80-65-250, the performance parameters of flow 0.014 m3 / s, pump head 80 m, NPSH 4.0 m, pump speed 2900 r / min, motor power 7500W, pump efficiency 54%. Magnetic pump is mainly composed of motor, magnetic coupling and corrosion-resistant centrifugal pump. When the motor drives the outer magnetic steel of the magnetic coupling to rotate, the magnetic flux passes through the gap and the isolation sleeve and acts on the inner magnet mounted on the pump shaft, so that the rotor rotates synchronously with the motor without mechanical contact to transmit the torque at the input end of the pump shaft Since the liquid is enclosed in a stationary isolation sleeve, there is no dynamic seal and no leakage at all. It is precisely because of the advantages of complete leak-free, successfully solve the problem of drip leakage in the fluid transport has become a very important product in environmental protection projects, more and more vulnerable to environmental protection industry such as Pepsi Chemical Wen wing industry attention, Is also the main reason for the selection of low-pressure recycling system absorption tower transformation. After the magnetic pump is put into operation, the problem of ammonia leakage is eliminated, and the utility model has the advantages of low vibration and low noise during running, bearing lubrication by the medium liquid itself and no need of lubricating oil. However, after more than a month of operation, noise increases and pump output decreases. Inspection found that the radial and axial bearing wear occurred, in particular, the graphite part of the thrust bearing was seriously damaged, leaving only a small part of the bearing body and impeller mouth rings and other internal parts worn seriously, had to be replaced. The next pump operation in the course of such phenomena occur continuously, the average time of 1 to 2 months.
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