空气压缩机

Duty cycle and air quality decide it. Intermittent use, a few hours a day: piston. Anything running more than about two hours a day: rotary screw. Air that touches food, medicine, electronics or textiles: oil-free.

It is the share of time a machine can spend compressing. A piston compressor needs to rest 30–40% of the time to shed heat. A screw compressor is rated for 100%. Running a piston machine continuously is the most common reason one dies early.

At 7 bar, budget roughly 6 kW per m³/min (about 0.17 kW per cfm). So a plant needing 3 m³/min is looking at an 18–22 kW machine. Higher pressure needs proportionally more.

Free air delivery is what actually comes out of the outlet, measured to ISO 1217. Displacement is the theoretical volume the rotors sweep. Displacement is always the bigger and more flattering number, always compare FAD, at the same pressure.

Yes. A receiver steadies pressure, catches condensate and stops a fixed-speed machine short-cycling. A useful rule is 6–10 litres per cfm, so a 100 cfm machine wants a 600–1,000 litre receiver.

Only if your demand varies. Log the machine for a week: if it is unloaded for more than about a third of its running hours, variable speed pays back in 14–24 months. On a constantly loaded duty it may never pay, and we will tell you so.

Our standard build is rated to 46 °C, and a high-ambient package takes it to 52 °C. Above the rating the machine does not explode: it derates and then trips on discharge temperature, usually on the hottest afternoon of the year.

A canopied screw machine is typically 66–72 dB(A) at one metre, which is quiet enough to stand beside and talk. An open piston machine is often above 85 dB(A) and needs hearing protection or a separate room.

Three phase for anything above about 3 kW. Star-delta starting is standard. Variable speed machines start soft. We supply the full-load current, starting current and recommended cable and fuse sizes with every quotation.

Delivery, positioning, connection to your existing pipework, commissioning, a performance check against the quoted figures, and operator handover. Foundation and electrical supply to the machine are normally the customer's scope, we specify both in writing.