Magnetic reaction kettleThe contactless stirring is achieved through magnetic coupling transmission technology, and its working principle can be disassembled into the following core steps:
1、 Magnetic coupling transmission: the core mechanism of power transmission
Coupling of internal and external magnets
Internal magnetic rotor: located inside the reaction vessel, directly connected to the stirring blade, usually made of permanent magnet material (such as neodymium iron boron).
External magnetic rotor: It is driven to rotate by a motor and drives the internal magnetic rotor to rotate synchronously by penetrating a non-magnetic isolation sleeve (such as stainless steel or titanium alloy) through a magnetic field.
Magnetic field effect: The rotating magnetic field of the outer magnetic rotor penetrates the isolation sleeve and interacts with the magnetic field of the inner magnetic rotor to form non-contact torque transmission, driving the stirring blade to rotate.
Static sealing structure
Traditional reaction vessels rely on mechanical shaft seals for sealing, but they are prone to leakage due to wear and tear. The magnetic reaction kettle eliminates mechanical shaft seals through magnetic coupling transmission and adopts a static sealing structure (such as O-ring or metal seal) to ensure the isolation of the reaction medium from the outside world.
IIMagnetic reaction kettleCollaborative work of key components
isolating sleeve
Material: usually made of stainless steel or titanium alloy, requiring high strength and corrosion resistance.
Function: Isolate the reaction medium from external magnetic fields, while withstanding high temperature and high pressure environments (such as a maximum temperature of 350 ℃ and a pressure of 15MPa).
Design requirement: The thickness should balance the magnetic field penetration force and pressure bearing capacity to avoid a decrease in stirring efficiency due to magnetic field attenuation.
mixing system
Mixing blade design: Select propulsion, turbine, or anchor type according to reaction requirements to ensure uniform mixing of materials.
Speed control: By adjusting the external magnetic rotor speed (usually 0-1000r/min) through a variable frequency motor, stepless speed regulation is achieved to adapt to different reaction conditions.
Temperature Control System
Heating method: jacket steam, electrically heated thermal oil or oil bath circulation, precise control of reaction temperature (accuracy ± 1 ℃).
Cooling function: equipped with cooling jacket or external circulation cooling system, quickly cooling down to terminate the reaction.
3、 Operation process and security mechanism
Preparation before reaction
Check the sealing of the isolation sleeve to ensure there is no risk of leakage.
Select the material of the kettle body based on the characteristics of the medium (such as stainless steel, titanium, or Hastelloy).
Install the mixing blade and calibrate the alignment of the inner and outer magnets to avoid vibration caused by magnetic field displacement.
Reaction process control
Parameter monitoring: Real time feedback of data to the control system through pressure sensors and temperature sensors.
safeguard:
Overpressure relief: Equipped with rupture discs or safety valves, it automatically releases pressure when the pressure exceeds the set value.
Overtemperature power-off: The temperature sensor triggers power-off protection to prevent equipment damage or uncontrolled reactions.
Magnetic steel demagnetization protection: If the inner magnetic rotor demagnetizes due to high temperature, the system will automatically shut down and sound an alarm.
Post reaction processing
After cooling and lowering the pressure to a safe range, loosen the main bolt and remove the kettle cover.
Clean the kettle body and mixing system to prevent residual media from corroding the equipment.