Fan speed

It should be above 3,000 revolutions per minute to be considered high speed, right?

Generally, 3000 r/min is used as the threshold; fans equipped with a speed increase gearbox that operate at speeds above 3000 r/min are considered high-speed fans. However, standard textbooks do not classify fans based on their speed. Classification of fans: I. Classification of fans by pressure 1. Ventilators: Exhaust pressure is below 0.115 MPa. 2. Blowers: Exhaust pressure is between 0.115 and 0.35 MPa. 3. Compressors: Exhaust pressure is above 0.35 MPa. 4. High-pressure centrifugal fans: (3000–15000) Pa. 5. Medium-pressure centrifugal fans: (1000–3000) Pa. 6. Low-pressure centrifugal fans: Below 1000 Pa. 7. High-pressure axial flow fans: 500–5000 Pa. 8. Low-pressure axial flow fans: Below 500 Pa. II. Classification of fans by airflow direction 1. Centrifugal ventilators: The inlet and outlet directions of the airflow are perpendicular to each other at 90 degrees ； 2. Axial flow fan: The inlet and outlet directions of the airflow are collinear on the same axis ； 3. Mixed-flow fan: The inlet and outlet directions of the airflow are coaxial and in a straight line relationship ； III. Classification of fans by usage 1. Fans specifically designed for kitchens ； 2. Air conditioning unit fan ； 3. Industrial fans ； 4. Roof fan series ； 5. Fans for industrial equipment ； 6. Dust exhaust and feeding fan ； 7. Silent fan ； 8. Explosion-proof and corrosion-resistant fan ； IV. Classification by material: 1. Ordinary fans 2. Explosion-proof fans 3. Corrosion-resistant fans 4. Heat-resistant fans 5. Wear-resistant fans V. Classification by structure: 1. Single-intake fans 2. Dual-intake fans 3. Multi-blade fans 4. Vane-type fans 5. Cabinet-type fans VI. Classification by drive method: 1. Type A drive – The fan impeller is directly mounted on the motor shaft. 2. Type B drive – The impeller is mounted in a cantilever manner, with the pulley located between the two bearings in the bearing housing. 3. Type C drive – The pulley is mounted in a cantilever manner at one end of the shaft, while the impeller is mounted in a cantilever manner at the other end. 4. Type E drive – The pulley is mounted in a cantilever manner, and the impeller is mounted between the two bearings; this includes configurations with dual intakes and bearings supported on the casing or intake opening. 5. Type D drive – The impeller is mounted in a cantilever manner relative to the fan casing through a bearing box, and it is connected to the motor via a coupling. 6. Type F drive – The bearing housings are installed at both ends of the fan casing, and the motor is connected to the fan via a coupling

High speed is considered to be above 3,000 revolutions per minute; 3,000 revolutions per minute is the synchronous speed

The so-called high speed and low speed mainly depend on whether there is a transmission device.

It has an accelerator, 4800 revolutions per minute – can that be considered high speed?

It can be considered so, but there’s currently no classification standard for this one!

As long as there is a gearbox, it can operate at high speeds

For the equipment in my factory, which doesn’t have a speed increase gearbox, how do I calculate the rotational speed of 4220–4570? It should be the rotational speed of the fan shaft, and this is unrelated to whether there is a speed increase gearbox or not