Can the magnetic drive pump maintain magnetic force under extreme high temperature?

Time：2022/2/10 14:54:40 Category：TECHNICAL ARTICLE Source： Click：

Magnetic drive pump are widely used in petroleum refining, petrochemical and other industries to transport special petroleum, printing and dyeing materials and their high-temperature media (operating temperature T<400℃). So can it maintain its magnetic force at extreme high temperatures? The following is an introduction by Shanghai Lingnai Special Magnetic Pump Co., Ltd. There is no magnetism at extremely high temperatures. The permanent magnet made of this material has a wide working temperature range (-45-400°C), high coercivity, good anisotropy in the direction of the magnetic field, and no demagnetization when the same magnetic pole is close. It is a good magnetic source.

When the magnetic drive pump is running, a small amount of liquid is used to flush and cool the annular gap area between the inner magnetic rotor and the blocking sleeve and the sliding bearing. The flow of coolant is usually 2% to 3% of the planned flow of the pump. The annular gap between the inner magnetic rotor and the barrier sleeve generates high heat due to eddy currents. When the cooling lubricant is lacking or the scouring hole is not smooth or blocked, the temperature of the medium will be higher than the working temperature of the permanent magnet, so that the inner magnetic rotor gradually loses its magnetism and the magnetic drive fails. When the medium is water or water-based liquid, the temperature rise of the annular area can be maintained at 3-5℃; when the medium is hydrocarbon or oil, the temperature rise of the annular area can be maintained at 5-8℃.

The magnetic drive pump should work under the regular temperature conditions, and the medium temperature should not exceed the specification. The platinum resistance temperature sensor can be installed on the surface of the magnetic pump barrier sleeve to detect the temperature rise in the annular area, and alarm or stop the machine when the temperature exceeds the limit. The ambient temperature of the magnetic pump should be less than 40℃, and the temperature rise of the motor should not exceed 75℃. The market mainly uses CQG type and CQB-G type.

Magnetic drive pumps are widely used in petroleum refining, petrochemical and other industries to transport special petroleum, printing and dyeing materials and other high temperature media conditions should not exceed 350 degrees Celsius, and the operating power of the pump will be affected under over-temperature conditions.