Compared with the traditional flexible jaw coupling pump, magnetic drive pump is mainly constitute of three parts: pump body, motor and driving device. Magnetic pump is the application of permanent magnet magnetic force to achieve torque transfer, that is, through magnetic coupler (permanent magnet coupling) to the motor output torque transfer to the impeller, to achieve the purpose of conveying medium of a pump. Because the pump shaft and the inner magnetic rotor are completely closed by the pump body and the isolation sleeve, there is no contact and friction between the inner and outer magnetic rotors, the power consumption is small, and it has damping damping, reducing the impact of the motor vibration on the pump and the impact of the pump cavitation vibration on the motor. Because the pump body and other common chemical pump pump body difference is not big, so now the magnetic pump research mainly focused on the driving device part.
At present, the research on magnetic pump at home and abroad mainly includes the following aspects:
Arrangement of internal and external magnets
In order to reduce the loss of magnetic flux (magnetic leakage), the form of magnetization arrangement is usually adopted. In order to further reduce magnetic leakage, tangential magnetized magnets can be added between two adjacent magnetic poles or a gradual magnetic circuit system can be adopted.
High temperature problem of magnetic pump
The driving device in the magnetic pump mainly has synchronous magnetic transmission and asynchronous induction ring two structural forms. Synchronous magnetic transmission technology's application in industry has been more than half a century, through theoretical analysis and experimental research and industrial practice, this technology has been mature, but under the condition of high temperature magnetism of permanent magnet can disappear dropped significantly until more than Curie temperature of a magnet magnetic (PVC) as well as adopted by the magnet and yoke bonding adhesive thermal aging, bonding strength is reduced, It will cause the failure of magnetic pump operation, resulting in huge economic loss, and become an obstacle to the development of permanent magnet drive.