Pump industry suppliers to tell you: magnetic pump material selection conditions of inner and outer magnetic steel

magnetic pump material selection of inner and outer magnetic steel

magnetic drive pump magnetic pump for short. Like shield pump, only static seal no dynamic seal structure. So during conveying fluid leak-off. Used in petrochemical system conveying inflammable, explosive, volatile, toxic, such as corrosion and precious liquids.

the pump body structure or centrifugal pump, but USES the magnetic drive transmission principle, through the coupling of the motor and outer magnetic steel together. Within the impeller and magnet steel together. Between the inner and outer magnetic steel is equipped with fully sealed isolation cover, the inner and outer magnetic steel completely separated, the magnetic steel in the medium.

and the motor shaft by magnetic polarity attraction between synchronization directly to drive the impeller rotation. Main component is magnetic pump inside the pump body, impeller, magnetic steel, magnetic steel, isolation cover, inside the pump shaft, pump shaft and the sliding bearing, roller bearing, coupling, etc.

at present commonly used material is as follows: rare earth cobalt, is a new type of permanent magnetic steel. Such as samarium cobalt, aluminum nickel and cobalt, praseodymium cobalt, cobalt and mixed rare earth rare cobalt and copper, etc. The magnetic energy product can reach 80 ~ 240 kl/m, magnetic transmission efficiency is high, and has a strong ability to resistance to demagnetization.

choose ferrite as magnetic water pump material earlier, but due to the magnetic energy product only 10 ~ 30 kj/m3, using only temperature 85 ℃, magnetic transmission loss is big, are now less likely to use. Metal separation sleeve, because within the set of the eddy current loss, in order to reduce the eddy current loss, improve the transmission efficiency and usually selects high resistance materials. The eddy current loss accounts for about 5% ~ 25% of total transmission efficiency. Non-metallic losses as set inside there is no electricity eddy current.

once the operating temperature is higher than in the operation of the magnetic pump magnet steel allowable temperature, the demagnetization effect will occur. Domestic magnetic pump generally use temperature for 1 ℃. Magnetic pump transmission medium is not allowed to contain iron has a ferromagnetic impurities or hard impurities. In order to prevent bearing and isolation of overheating or burning, avoid by all means is idle running, not allowed to run at less than 30% rated flow. Due to the fundamental magnetic pump to eliminate the leakage of the shaft sealing, at the same time automatic overload protection in power transmission. In the petroleum chemical industry and medicine, etc, when driving power is not big, now has been gradually expanding the application.

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