1, Efficiency,
Excellent gear transmission efficiency can reach 98%-99%, and
excellent belt transmission design can also reach 99% efficiency
under normal working conditions.The difference between the two does not depend on the choice of
transmission mode, but on the manufacturer's design and
manufacturing level.
2, No load energy consumption
For direct gear transmission, no-load pressure is generally
maintained at more than 2.5 bar, and some even as high as 4 bar, to
ensure lubrication of the gearbox.
In the case of belt drive, no-load pressure can theoretically be
zero because the oil sucked into the rotor is sufficient to lubrate
the rotor and bearings.For safety purposes, the pressure is maintained at about 0.5 bar.Taking a 160-kW geared air compressor as an example, it works 8000
hours per year, of which 15% (i.e. 1200 hours) are idle. This
machine will consume 28,800 kWh more electricity per year than the
belt driven air compressor of the same power (assuming the no-load
pressure difference between the two machines is 2 bar, about 15%
energy consumption difference).In the long run, this will be costly.
3, The loss of oil
Experienced practical users know that the gearbox will be the first
to suffer in a loss of oil.The belt drive system does not have such safety problems at all.
4. Design working pressure according to user requirements
Usually the working pressure required by the user is not exactly
the same as that of the manufacturer's standard model.For example, the user's required pressure is 10 bar. According to
the condition of post-processing equipment, pipe length and sealing
degree, the working pressure of Suzhou air compressor may be 11 or
11.5 bar.In this case, an air compressor with a rated pressure of 13 bar
will generally be installed and the outlet pressure set at the site
to the required working pressure.At this point, the exhaust volume will basically remain the same,
because the final working pressure is reduced but the rotor speed
does not increase.Represent the modern technology of belt drive design manufacturers
simply change the pulley diameter and design the working pressure
to be exactly the same as the user's requirements, so that the user
with the same power of the motor can get more air volume.For gears, this is not so convenient.
