Phenomenon and cause of magnetic slip in magnetic pump

(1) Sliding magnetic phenomenon when the magnetic pump is overloaded or the rotor is stuck during operation, the driving and driven parts of the magnetic driver will slip off automatically. At this time, the driven parts will not operate synchronously with the driving parts, resulting in demagnetization. It is characterized by: ① the pump outlet pressure decreases. ② The motor current of the pump decreases. ③ The temperature at the magnetic linkage rises rapidly. Under the action of the alternating magnetic field of the active rotor, the permanent magnet on the magnetic driver will produce eddy loss and magnetic loss, resulting in the temperature rise of the permanent magnet, the magnetic force of the magnetic driver will fail, and the sliding bearing of the pump will be damaged at the same time. (2) The reasons for the magnetic slip of the magnetic pump are as follows: ① the barrel pump was originally used, and the outlet pipeline of the pump is DN100. After replacing the pump, the outlet pipeline is required to be DN65. However, due to the difficulty of construction, the original DN100 pipeline is still used. When operating the pump in this way, it is difficult to control the opening of the valve at the pump outlet, which is easy to cause overload operation of the pump and produce sliding magnetism. ② Because the density of liquefied gas changes greatly with temperature and pressure, when using magnetic pump to transport liquefied gas, the working condition of the pump changes greatly, which increases the possibility of cavitation and produces sliding magnetism. ③ The operator's sense of responsibility is not in place, and the liquid level of the storage tank cannot be grasped in time during the operation of the magnetic pump, which makes the pump empty and produce sliding magnetism. ④ The magnetic torque is too small. ⑤ The magnetic sleeve of the magnetic coupling of the pump was not cleaned in time, and there were many attachments to the magnetic sleeve, which reduced the magnetic force and caused sliding magnetism during operation. The phenomenon and causes of magnetic slip in magnetic pump are analyzed.

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