What is the slow pumping of the air compressor?

Slow pumping of air compressors may be caused by many factors. The following are some common reasons and investigation directions:

1. Core mechanical issues

1. Piston/screw wear
   • performance: The internal clearance increases, the compression efficiency decreases, and it takes longer to reach the target pressure.
   • check: Observe whether there is any abnormal sound or air leakage, or disassemble and inspect piston rings, bearings and other components.
2. valve fault
   • performance: The inlet valve or exhaust valve is not tightly sealed, causing compressed air to flow back or leak.
   • check: Whether the valve plate is deformed, whether the spring fails, or whether there is carbon deposit on the valve seat.
3. Belt/drive system issues
   • performance: Belt slipping and gear wear lead to insufficient speed.
   • check: Belt tightness (pressing should have 1-2cm elasticity), gear box lubricating oil is sufficient.

2. Insufficient maintenance

1. Air filter is blocked
   • performance: The air intake volume is reduced, and the “idle” time of the air compressor is extended.
   • solve: Replace the filter element regularly (usually every 500 hours or 3 months).
2. Plugged oil filter/oil-gas separator
   • performance: Increase in oil path resistance, insufficient lubrication or high oil content in exhaust gas.
   • solve: Replace periodically according to the instructions (usually every 1,000 – 2,000 hours).
3. Insufficient coolant or poor heat dissipation
   • performance: High temperature causes the air compressor to operate at reduced frequency.
   • check: Coolant level and whether dust is accumulated on the radiator.

3. Configuration and use issues

1. Insufficient storage tank capacity
   • performance: Small tanks need to be pressurized frequently, and the air compressor continues to operate at high load.
   • recommendations: Select the air storage tank according to the air consumption (usually matched by 10%-20% of the air compressor exhaust volume).
2. Incorrect pressure switch setting
   • performance: The start-stop pressure difference is too small (such as 0.4-0.6MPa), resulting in frequent start-stop.
   • adjustment: Increase the pressure difference appropriately (usually set to 0.8-1.0MPa).
3. Gas consumption exceeds rated value
   • performance: When multiple pneumatic devices are turned on at the same time, the pressure drops quickly.
   • solve: Upgrade the power of the air compressor or increase the air storage tank.

4. Environmental factors

1. ambient temperature is too high
   • impact: The air compressor has poor heat dissipation and is automatically down-frequency protection.
   • deal with: Improve ventilation or install cooling devices.
2. Higher altitude or thin air
   • impact: Low intake density and reduced pumping efficiency.
   • solve: Select a special model for plateau or increase the displacement of the air compressor.

5. Quick investigation steps

1. listen to the sound: Whether there is air leakage, abnormal vibration or abnormal noise.
2. measured temperature: Check whether the fuselage is too hot.
3. Look at the oil level: Ensure that the lubricating oil is within the scale range.
4. Check records: Review the recent maintenance time and replacement of parts.

If you cannot solve it yourself, it is recommended to contact the air compressor manufacturer or professional maintenance personnel to test the pressure curve, airtightness and sensor status. Regular maintenance (such as replacing tertiary filters and lubricants) can extend equipment life and improve efficiency.