What is the foil?
Foil bearings are a type of specialized air bearings that use the foil loaded with a spring to support the magazine on axle or shaft until a certain rotation rate is achieved. When the foil bearing rotates, the air pulls into the space between the magazine and the sleeve. This creates sufficient air pressure in this space to push the foil out of the way, so the bearing is completely supported by the air. Since there is no physical contact between the different components of the bearing of the film at this point, there is very low wear beyond the initial start period. Foil bearings can be used in any application that includes a high speed of rotation, and turbomachines is one prominent example.
Bearings are devices that are designed to allow one object to turn in another object, and they are usually expected to resist some type of load. Traditional bearings consist of sleeves and bearings that are separated by balls, rollers or other components that B mustI have to be linked to. Other simpler bearings contain no cylinder elements and the bearing of the film is a variation that uses the foil to replace both cylinder elements and bearing surfaces.
Most of the foil bearings consist of three main ingredients that are a bearing housing and two layers of foil. These layers are usually referred to as upper foils and foils and each serves a different purpose. The upper foil usually acts as a bearing surface that is what is a magazine about a shaft or axle, while the bumpy foil offers the necessary support. When the diary rotates in the foil deposit, the air foil is occupied. This causes the foil to pull out of the bearing housing and diary and leave the shaft or axle suspended on the pressure air layer.
The main purpose of the foil bearing is to eliminate the requirement for oil or other lubrication of the subpacses that most other bearing patterns have. INObviously, the magazine and sleeve are separated during pressure by pressure air and new volumes of air are constantly stretched, small or no wear occurs if sufficient rotation speed is maintained. Wear occurs whenever the foil bearing is put into operation or stopped, although some of these bearings last over 100,000 such cycles.
There are also several other advantages that offer foil bearings, such as increased tolerance to incorrect leveling. The bearings are often very sensitive to incorrect leveling, but the bearing of the film is usually correct automatically. Some foil bearings can also withstand temperatures above 1,200 ° F (about 650 ° C), making them well suitable for high -temperature turbomachiners and other similar applications.