【Weekly Question】Discussion on loading/unloading issues caused by centrifugal compressors

In centrifugal compressors, a decrease in the current of the main motor along with frequent automatic load adjustments may indicate the following problems: 1. **Internal wear of the compressor**: Prolonged operation can lead to wear of components such as blades and bearings, which affects compression efficiency. 2. **System leakage**: Undetected leaks in the pressure system cause the compressor to load and unload. 3. **Cooling system issues**: Insufficient cooling can lead to a decline in compressor performance. 4. **Control system failure**: Issues with the control logic or sensors can lead to incorrect loading and unloading behaviors. 5. **Power supply issues**: An unstable power supply or a drop in voltage can also cause the device to operate unevenly. 6. **Failure in outlet pressure regulation**: Damage or changes to the outlet pressure control valve or related components prevent the compressor from operating stably. It is recommended to conduct a thorough inspection and maintenance of the above aspects. .

Macroscopically, the decrease in current is presumed to be caused by an increased gap, while the frequent loading and unloading is presumed to be caused by axial movement.

Unstable or low supply voltage may cause a decrease in the current of the compressor’s main motor. This may be caused by fluctuations in grid voltage, poor contact in power supply lines, or aging of power supply equipment. It is recommended to check the voltage meter to confirm whether the supply voltage is stable, and consider using a voltage stabilizer or replacing it with a higher-quality power supply to resolve the issue