Is the magnetic coupling working properly?

The following is XINLANCouplingThe analysis pump cannot pump liquid.The failure of the pump to pump liquid is a common failure of the pump*, and there are many reasons for it.First of all, check whether the suction pipe of the pump is leaking, check whether the air in the suction pipe is discharged, whether the amount of liquid filled in the pump is sufficient, whether there is any blockage in the suction pipe, and check whether the pump is reversed ( Especially after the motor has been changed or the power supply line has been overhauled), pay attention to whether the suction height of the pump is too high.If you still can't solve the problem through the above inspection, you can disassemble the pump and check whether the coupling is broken. Also, check whether the moving ring and static ring of the pump are intact, and whether the entire rotor can move slightly in the axial direction.If the axial movement is difficult, check whether the carbon bearing is too tightly combined with the pump shaft.

    It is worth noting that the pump has been repaired several times and no problems can be found. It should be noted that the magnetic coupling is working properly.Bearings, inner magnetic rotors and spacers all generate heat during operation, which will increase the operating temperature, on the one hand, reduce the transmitted power, on the other hand, it will cause a lot of trouble for pumps that transport easily vaporized liquids.The power transmitted by the magnetic steel is a continuous decline curve with the increase of temperature. Generally, the reduction of its transmission capacity is reversible below the working limit temperature of the magnetic steel, but is irreversible above the limit temperature, that is, the magnetic steel is cooled. Later, the lost delivery capacity can no longer be restored.Under special circumstances, when the magnetic coupling slips (out of step), the eddy current heat in the spacer will increase sharply, and the temperature will rise sharply. If it is not handled in time, it will cause the magnetic steel to demagnetize and cause the magnetic coupling to fail.

    Therefore, the magnetic pump should be designed with a reliable cooling system.For the medium that is not easy to vaporize, the cooling circulation system generally leads the liquid flow from the outlet of the impeller or the pump, and returns to the suction port through the bearing and the magnetic transmission part. For the medium that is easy to vaporize, a heat exchanger should be added or the liquid flow should be led outside the pump To prevent the heat from returning to the suction port, consider filtering the medium with solid impurities or ferromagnetic impurities, and consider cooling for high-temperature media to ensure that the magnetic coupling does not exceed the operating limit temperature.When considering whether the rotation speed is sufficient, first check whether the rotation speed of the motor itself is normal, which can be measured with a tachometer. When the rotation speed of the motor is normal, consider whether there will be slippage of the magnetic coupling.
 

Botou XINLAN Coupling Co., Ltd. is an enterprise specializing in the research and production of couplings.Our company has a variety of equipment and strong technical force. It is a manufacturer of various types of couplings. The main products are: various star- shaped elastic couplings, tire couplings, universal couplings, drum gears Type coupling, plum-shaped elastic coupling, rigid coupling, slider coupling, roller chain coupling, diaphragm coupling, elastic sleeve pin coupling, elastic pin coupling, Elastic pin gear coupling, water pump coupling, etc.