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Screw air compressor drive comparison
Sep 21, 2018

Efficiency

Excellent gear transmission efficiency can reach 98%~99%, and the excellent belt drive design can achieve 99% efficiency under normal working conditions. The difference between the two does not depend on the choice of drive mode, but on the manufacturer's design and manufacturing level.

2. No-load energy consumption

For gear direct transmission, the no-load pressure is generally maintained above 2.5 bar, and some even up to 4 bar to ensure lubrication of the gearbox.

In the case of the belt drive, theoretically the no-load pressure can be zero because the oil sucked in by the rotor is sufficient to lubricate the rotor and the bearing. Generally for safety reasons, the pressure is maintained at around 0.5 bar.

Take a 160kw gear-driven air compressor as an example. It works 8000 hours a year, 15% (1200 hours) of which is idling. This machine will consume 28800kwh more than the belt-driven same-power air compressor every year. The electricity bill (assuming that the two machines have a no-load differential of 2 bar and a difference of 15% in energy consumption), in the long run, this will be a small expense.

3. Loss of oil

Experienced actual users know that the first damage to the oil loss situation will be the gearbox. There is no such safety issue with belt drive systems.

4. Design work pressure according to user requirements

Usually the work pressure required by the user is not exactly the same as the pressure of the manufacturer's standard model. For example, if the user requires a pressure of 10 bar, depending on the condition of the post-treatment equipment, the length of the piping and the degree of sealing, the working pressure of the air compressor may be 11 or 11.5 bar. In this case, a compressor with a rated pressure of 13 bar is usually installed and the outlet pressure is set to the required working pressure on site. At this time, the amount of exhaust gas will remain basically the same, because the final working pressure is reduced, but the speed of the rotor is not increased.



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