What is an air suspension fan?
Release date:
2022-03-02
An air-bearing fan is a type of blower in which the high-speed rotation of the blower rotor generates a hydrodynamic pressure effect between the rotor and the foil bearing surface, creating a high-pressure gas film that lifts the rotor!
Air suspension fan It is a type of blower in which, as the blower rotor spins at high speed, the air generates a hydrodynamic pressure effect between the rotor and the foil bearing surface, forming a high-pressure gas film that lifts the rotor!
The air-bearing fan primarily consists of an impeller, a levitation bearing, a frequency converter, a high-speed permanent-magnet motor, and its structural control system. The motor’s main shaft is coaxial with the fan impeller, and the high-speed rotor system is directly supported by bearings. The key core technologies include the bearing technology, the high-speed permanent-magnet synchronous motor and its control technology. The working medium is air, and the supporting surfaces are elastic flat foil sheets, while the supporting components are elastic wave foil sheets.
Initially, the impeller rotor is in contact with the bearings. However, as the rotor enters a high-speed rotation state, a dynamic pressure effect arises between the surfaces due to the viscosity of the air and the wedge-shaped air film. On the foil and rotor surfaces, both flat foils and corrugated foils undergo elastic deformation: the flat foils are pushed aside, leaving the rotor suspended in midair. The non-uniform circumferential air pressure enables the foil bearing to support the load. Or, put more simply, during the rotor’s high-speed rotation, a high-pressure gas film forms between the rotor and the foils, thereby lifting the rotor. Air-bearing fan.
As can be seen above, although... Air suspension fan After the equipment is running normally, there is no friction between the impeller and the rotor; however, this does not mean that there is absolutely no friction throughout the entire operation process. During the startup and shutdown phases of foil bearings, when the rotational speed falls below the critical speed, the hydrodynamic pressure effect is insufficient to stabilize the rotor. At this point, contact friction still occurs between the inner surface of the bearing and the rotor. Although this period is brief, it does involve some degree of sliding friction. The wear caused by this thin-film friction can shorten the service life of the bearing. Therefore, when using air-bearing fans, it’s best to minimize frequent start-ups and shutdowns. Meanwhile, to extend the service life of hydrodynamic bearings, it’s essential to apply a high-quality lubricating coating to their surfaces.
Air suspension fan Technical Features
1. Energy-efficient and highly efficient—without contact losses or mechanical friction in the bearings, it achieves stepless high-speed regulation, boosting fan operating efficiency up to 95%. Air-bearing fan.
2. Low noise, compact size, and easy installation—all components (high-speed motor, frequency converter, floating bearings) are integrally mounted on a shared base, eliminating the need for a specially designed foundation. This equipment is small in size, lightweight, easy to install and operate, and features low noise and vibration during operation, with a noise level below <80 dB.
3. Highly system-integrated: The blower itself is equipped with integrated local control and a variable-frequency drive system, eliminating the need for separate frequency converter cabinets and operator control panels. Through the blower’s own control panel, operators can set various functions and monitor parameters such as fluid temperature, motor speed, outlet pressure, air volume, and power consumption. The high-efficiency filter, cooling system, fully automatic anti-surge system, and power-off and fault protection systems are all centrally installed within the blower cabinet, providing convenience for operators and reducing the likelihood of operational accidents.
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