Why does corrosion-resistant magnetic pump not allow empty operation: Causes and preventive measures

Corrosion-resistant magnetic pumps have been widely used in chemical, pharmaceutical and environmental industries due to their non-leakage design and excellent corrosion resistance. However, the corrosion-resistant magnetic pump is strictly prohibited from running empty during operation.

This article will delve into the reasons why corrosion-resistant magnetic pumps do not allow empty operation and provide corresponding precautions to ensure safe and efficient pump operation.

Definition of idling

Idling is when the pump runs without liquid. This usually occurs when the liquid does not enter the pump chamber in time when the pump is started, or when the liquid supply is interrupted during operation.

1) The influence of idling on corrosion resistant magnetic pump

1. Damaged sliding bearing

The sliding bearings of corrosion-resistant magnetic pumps are usually made of materials such as high-performance ceramics or silicon carbide and rely on the liquid being transported to lubricate and cool them. If the pump is running without liquid, sliding bearings can quickly overheat due to lack of lubrication and cooling, leading to serious wear and even damage.

2. Overheating

When the corrosion-resistant magnetic pump is running in the air, there is no liquid flow in the pump chamber, and the pump body cannot effectively dissipate heat, resulting in a rapid rise in temperature. Overheating will not only damage the pump body and internal components, but also may cause safety accidents such as fire.

3. Magnetic coupler demagnetization

The magnetic coupler is an important part of the magnetic pump and is responsible for transferring the power of the motor to the pump shaft. If the pump runs for a long time in the idling state, the temperature of the magnetic coupler will increase significantly, causing the magnet to demagnetize, which reduces the transmission efficiency and even fails.

4. The pump body is damaged

When the pump is idling, the internal lack of liquid lubrication and cooling, resulting in increased wear of the pump body and impeller, and serious damage to the pump body, unable to continue to use.

2) Measures to prevent idling

1. Install the liquid level controller

A level controller is installed at the inlet of the pump to monitor the liquid level in real time. Once the level is too low, the level controller will issue an alarm or automatically stop the operation of the pump to prevent idling.

2. Set the flow protection device

The flow protection device can detect the actual flow of the pump. Once the flow rate is detected to be too low or no flow, the flow protection device will cut off the power supply in time to stop the operation of the pump and prevent idling.

3. Get regular checkups

Regular inspection of pump inlet and outlet pipes, level controllers and flow protection devices to ensure that they are operating properly, timely detection and resolution of potential problems to prevent idling.

4. Pump before starting

Before starting the corrosion-resistant magnetic pump, ensure that the pump cavity is filled with liquid. This can be done by manually filling the pump or setting up an automatic pumping system, ensuring that the pump has enough liquid when it starts.

Corrosion resistant magnetic pump with its excellent sealing performance and corrosion resistance, has become the preferred equipment in many industries. However, idling damage to the magnetic pump is significant and serious. By understanding the hazards of idling and taking appropriate preventive measures, such as installing level controllers, setting flow protection devices, regular inspection and pre-start pump, idling can be effectively avoided to ensure the safe and efficient operation of corrosion-resistant magnetic pumps.