What Is the Common Issue Causing Magnetic Drive Pump Failures?

If basic preventive maintenance measures are taken, sealless magnetic pumps do not often fail.
But in order to have better pump quality and efficiency, there are several basic concepts that need to be understood. The following introduces the main problems that may be encountered.

1. Pump Dry Running
   Dry running will occur when the pump is running when the flow rate is insufficient and the liquid is not filled with liquid. If the pump is running idling, internal components (such as impellers, bearings, etc.) will rub, resulting in a large amount of Frictional heat and pressure can damage the pump.
   
   
2. Motor Overload
   Mostly caused by excessive current. The main reasons for excessive current are increased pipeline outlet load, excessive head, poor heat dissipation, pipeline blockage, and wrong selection of motor or pump. Wait, the operating power at this time will increase, and the motor may burn out under long-term operation.
   
   
3. Cavitation
   When the pump is running, if the local area of ​​the overflow part (commonly found in the impeller) is due to large resistance in the inlet pipeline, more gas phase of the conveyed medium, etc., the pressure of the pumped liquid is reduced to When the liquid vaporizes at the current temperature and pressure, the liquid begins to vaporize and form bubbles. After the bubbles enter the impeller with the liquid, the surrounding high pressure causes the bubbles to shrink rapidly and even burst. At the same time as the bubbles condense and collapse, the liquid particles fill the holes at high speed, causing a strong water hammer effect at this moment and hitting the metal surface with extremely high impact frequency.
   Cavitation is the most harmful to pumps. When cavitation occurs, the pump will vibrate violently and make noise, which will cause damage to the pump bearings, rotor, or impeller.
   
   
4. Magnetic Decoupling Decoupling
   As the temperature rises, the strength of the magnetic force weakens or the fluid viscosity is too high, the transmittable torque is less than the required torque, and in the absence of cooling or sufficient torque. If the pump continues to operate under high conditions, demagnetization will occur, which will cause the magnet of the magnetic pump to demagnetize, thereby damaging the pump and causing malfunction.

To avoid these problems, use an idle protector to monitor the current or power of the pump motor when it is running. When the current is too high or too low, it will immediately issue a warning or automatically shut down. This function greatly reduces the power generated by the pump. Probability of failure and maintenance costs.

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