螺杆式空气压缩机

Two helical rotors mesh together and trap air between themselves and the housing. As the air travels along the rotors that trapped space gets smaller, so the air is squeezed continuously rather than in pulses.

There is no reciprocating mass, so no impact loading and almost no vibration. That is why a screw machine is rated for a 100% duty cycle while a piston machine needs to rest 30–40% of the time.

Mineral oil every 2,000 hours, semi-synthetic every 4,000, full synthetic every 8,000. In Gulf and Pakistani ambient temperatures synthetic usually works out cheaper per hour despite costing more per litre.

The airend is the rotor pair and their housing, the actual compressor. With correct oil and filtration it runs 40,000 hours or more. We hold rebuilt exchange airends so a replacement is a next-day job rather than a six-week repair.

Fixed speed if the machine runs loaded nearly all the time. It is cheaper and marginally more efficient at full load. Variable speed if demand swings, because an unloaded fixed-speed machine still draws 25–35% of full power for no air at all.

Yes, continuous duty is what the design is for, and many of our installations run 8,000 hours a year. What shortens life is not hours but heat, dirty intake air and skipped oil changes.

Almost always airflow, not the machine. A blocked cooler, a dirty intake filter, recirculating hot discharge air, or a plant room without enough ventilation. Check those before assuming the compressor is at fault.

Air-cooled below about 90 kW, unless the plant room cannot get rid of the heat. Above that, water cooling takes the heat out of the room entirely, which in a Gulf summer is often the difference between a machine that runs and one that trips.

Yes, up to 76% of the electrical input comes back as hot water at around 70 °C. On a 45 kW machine running two shifts that is enough to pre-heat boiler feed water. We calculate it from your running hours before recommending it.

Take the kW, multiply by running hours and your tariff. A 37 kW machine at 6,000 hours a year on a typical industrial tariff costs many times its purchase price over ten years, which is why specific energy, in kW per m³/min, matters more than the quoted price.