无油空气压缩机

That there is no lubricant anywhere in the compression chamber. The rotors are timed by gears and never touch each other or any oil. It is not the same as an oil-injected machine with good filtration downstream.

The strictest class in the standard: no measurable oil at all, including vapour and aerosol, not merely a low figure. Every machine we supply comes with its certificate.

Particulate filtration, yes: pipe scale and intake dust still exist. But you can drop the coalescing and carbon stages, which removes about 0.4 bar of permanent pressure drop and the energy that goes with it.

Yes, oil-free says nothing about water. The machine still draws in humid ambient air, so you dry to whatever pressure dew point your process requires exactly as you would with any other compressor.

Without oil to seal the gap between the rotors, they have to be manufactured to far tighter tolerances, coated, and timed by precision gears. That is a fundamentally more expensive machine to build, not a price premium for a badge.

Food and beverage, pharmaceutical, electronics, hospitals and textile air-jet weaving. In a fabrication shop or a vehicle workshop it is money spent on a risk you do not have.

On paper it gets close. The difference is what happens when a filter element fails or is not changed on time, with an oil-free machine there is nothing to fail. That is a risk decision, not a technical one.

Intake filters, gearbox oil, coolers and the rotor coating inspection. There is no separator element and no oil in the air path, so consumable cost is lower, though the scheduled interventions are more specialised.

It is clean water. Nothing oily leaves the machine, so there is no oil-water separator to buy or maintain and nothing to declare to an environmental inspector.

Two-stage compresses in two smaller steps with cooling in between, which cuts specific energy by 8–12%. Above about 37 kW and continuous running, it pays for itself. Below that, single-stage is usually the sensible choice.