Isolation sleeve as the main part of the magnetic pump is located between the rotating magnetic rotor and the rotating outer rotor, and due to the pump material strength and processing technology and the use of conditions and other restrictions, most of the isolation sleeve made of metal material. Magnet rotor in the coupling rotation, the metal sleeve is subject to a sinusoidal alternating magnetic field, according to the principle of electromagnetic induction, will produce induced current. Induced current in the wall thickness of the isolation sleeve closed to form a vortex. Centrifugal pump in accordance with Joule - , Eddy current in the isolation sleeve will produce a lot of heat. In the meantime, during the working process of the magnetic pump, the fluid in the gap between the inner magnetic rotor and the isolation sleeve moves rapidly with the rotation of the inner magnetic rotor, and the moving fluid generates violent erosion and friction on the isolation sleeve wall to make the isolation sleeve In addition, the shield motor windings have copper loss, fever caused by magnetic loss, before and after the guide bearing and the thrust plate more or less to bear the load, friction, will also cause heat, making the metal sleeve temperature increases. , Isolation sleeve is the main component of the magnetic pump heat source body. Because the isolation sleeve is the temperature of the magnetic pump to withstand the highest place, the centrifugal pump is located between the rotating magnetic rotor inside and outside the temperature sensor on the isolation sleeve on the temperature changes in real-time monitoring can more intuitive reaction of the magnetic rotor inside and outside the rotor Operating temperature status changes, timely detection of failure.