Oil-free Scroll Air Compressors For Electric Trucks

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Oil-free Scroll Air Compressors for Electric Trucks

 

 

 

Working Principle: How to Achieve "Oil-Free" Compression?

The core working principle of an oil-free scroll compressor can be summarized as "meshing of moving and stationary scrolls, continuous volume change." Its working process consists of three stages:

 

1. Intake Stage: Air enters through the intake port on the outside of the scroll. The crescent-shaped sealed cavity formed by the meshing of the moving and stationary scrolls gradually expands, drawing in air.

 

2. Compression Stage: The moving scroll is driven by an eccentric shaft, oscillating around the center of the stationary scroll in a small-radius planar motion (revolutionary motion). The moving scroll itself does not rotate (controlled by an anti-rotation mechanism), ensuring that the two scrolls always maintain a 180° phase difference. As the moving scroll moves, the volume of the sealed cavity continuously decreases, and the air is gradually pushed towards the center and compressed.

 

3. Exhaust Stage: Once the air is compressed to the rated pressure, it is continuously discharged from the exhaust port at the center of the stationary scroll. Because the scrolls operate without contact (only a tiny gap), there is no metal-to-metal friction within the compression chamber; no lubricating oil is required.

 

 

 

The compression medium	Air medium
Working pressure	Suction pressure	Atmospheric pressure
	Discharge pressure	0~12.5Mpa
	Power to flow ratio	≤12(including motor and controller)
Temperature	Temperature	-40℃~+65℃
	Suction temperature	-40℃~+65℃
	Discharge temperature	≤90℃+Ambient temperature(Water cooling)

 

 

 

 

The oil-free scroll air compressor is a positive displacement compressor. Its core consists of two identical scroll discs (one fixed, the other eccentrically moving) meshing together, each 180° out of phase. Its most significant feature is that no lubricating oil is required within the compression chamber, thus eliminating oil contamination of the compressed air.

 

Technical information on scroll-type oil-free air compressor

 

Compressor style	Oil-free scroll air compressor
The compression medium	Air
Normal speed	1800-3200rpm
Power supply voltage	380VAC Three-phase
Compressor cooling method	Forced water cooling
Weight	44kg(including motor and controller)
Shell	Electroplating on aluminum parts
Installation method	Bolt connection
Installation size	Drawing 4 - M10 mounting position and motor metal waterproof connector
Outline dimension	334*300*354
Suction pipe inner size	Outer diameter Φ25
Exhaust pipe inner size	Φ25 M22*1.5 Compression fitting
Hydraulic pressure of coolant	＜1bar
External coolant flow rate	≥10L/min
Coolant inlet temperature	≤65℃

 

 

 

 

 

Speed(rpm)	3200
Rated flow (L/min)	≥480
Applied power(KW)	≤5.8(including motor and controller)
Power to flow ratio	≤12(including motor and controller)

 

 

 

 

Speed(rpm)	3200
Noise level,dB(A)	≤65

 

 

 

 

 

 

 

 

 

 

Before troubleshooting, the power supply must be disconnected. Always disconnect the main power supply and release the pressure inside the air compressor before any repairs or maintenance.

 

 

The air compressor can only be inspected after it has cooled to a temperature where it can be touched by hand. Do not use cold water to cool it directly.

 

 

Hydrogen fuel cell systems: Provide clean, oil-free compressed air to the fuel cell stack, preventing catalyst poisoning.

Railway systems: Used in train braking and air suspension systems.

High-speed trains: Provide a clean air source for pneumatic equipment.

 

 

 

 

 

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