Jiangsu Sunkaier Industrial Technology Co., Ltd.
Jiangsu Sunkaier Industrial Technology Co., Ltd.

The Working Principle and Operation Mode of Magnetic Agitator

Overview of working principle of magnetic agitator

In the magnetic agitator, the blade, stirring shaft and internal magnetic rotor are connected as a whole, and are supported by bearings as the passive component of the equipment; the external magnetic rotor is connected with the reducer as the active component of the equipment. The passive and active components are fully isolated by a complete isolation sleeve.

During operation, the external magnetic rotor is driven by the motor through the reducer. Due to the presence of a magnetic field between the internal and external magnetic rotors, the external magnetic rotor can drive the passive components (such as the stirring shaft, etc.) connected to the internal magnetic rotor synchronously to achieve the purpose of torque transmission without contact.

Working mode and characteristics of magnetic agitator

During normal operation of the magnetic agitator, the rotating stirring shaft and blade extend into the absorption tower together, while the sealed bucket is fixed on the agitator cover and does not move. Therefore, there is a working gap between the agitator shaft and the sealed bucket. To prevent the slurry from flowing back into the agitator, it must be sealed.

At the same time, neodymium iron boron magnetic material is selected for the internal and external magnetic rotors. When the working temperature rises above 80℃, serious demagnetization may occur, and the ability to transmit magnetic torque will quickly decrease, which may cause the agitator to malfunction.

To solve these problems, cooling and lubrication channels are designed in the agitator, and the medium is tap water. Since the slurry pressure in the absorption tower is about 0.2MPa, as long as the cooling and lubrication water pressure is kept above 0.3MPa, after cooling the internal and external magnetic rotors and lubricating the sliding bearings, due to the pressure difference between the left and right sides of the sealed bucket, the cooling water continuously enters the absorption tower, preventing the slurry from flowing back into the agitator, and realizing water pressure sealing.

The magnetic agitator has the following characteristics compared with mechanical agitators

  • The mechanical shaft seal is removed and replaced with a water pressure seal, achieving zero leakage.

  • A magnetic drive soft connection is used to achieve contactless transmission, reduce agitator power loss, and achieve significant energy-saving effects.

  • Sliding bearings are used instead of rolling bearings, and the point contact is changed to surface contact, reducing the radial force of the bearings, improving the service life of the bearings, extending the maintenance cycle, and making the agitator operate with low vibration, low noise, stable operation, safety and reliability.

  • The structure is compact and requires less maintenance.

Due to the absence of shaft seals and zero leakage, the magnetic drive agitator has excellent performance, stable operation, and easy maintenance, and has steadily entered the power industry market in recent years.