Mechanical equipment topic 01: The reason why magnetic pumps are more prone to cavitation than centrifugal pumps
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This post was last edited by zx9527007 on 2009-12-8 19:50. The magnetic pump is only structurally different from ordinary pumps. Its cavitation performance does not change due to its different structure. It mainly depends on its hydraulic model. The magnetic pump is different from the ordinary centrifugal pump in that it mainly has an isolation sleeve. Internal and external magnets, this place is prone to eddy current heat, which is of course prone to cavitation. Such low pressure is prone to cavitation. Due to the magnetic eddy current generated in the magnetic pump, it is easy to vaporize. Cavitation is caused by the vaporization of liquid. Therefore, magnetic pumps are more prone to cavitation than centrifugal pumps!
I just know that temperature changes have a greater impact.
This situation will not cause cavitation and has little impact on the working conditions, but it will be extremely harmful to the pump. When the magnetic pump is running, a small amount of liquid must be used to flush and cool the annular area between the inner magnetic rotor and the isolation sleeve and the friction pair of the sliding bearing. The flow rate of the coolant is usually 2%-3% of the pump design flow rate. The annular area between the inner magnetic rotor and the isolation sleeve generates high heat due to eddy currents. When the cooling lubricant is insufficient or the flushing holes are not smooth or blocked, the temperature of the medium will be higher than the operating temperature of the permanent magnet, causing the temperature of the internal and external magnetic rotors to rise. When the demagnetization temperature of the magnet is reached, the magnet will demagnetize rapidly and irreversibly.