Thrust air foil bearing with high bearing capacity

Abstract

The invention discloses a thrust air foil bearing with high bearing capacity. The thrust air foil bearing comprises a bearing base, a dowel pin, a first layer of bump foils, a second layer of bump foils, a third layer of bump foils and a top foil; foil supporting structures of the bump foils are different; each section of the bearing is divided into three areas, namely a first wedge-shaped area, a small-rigidity area and a large-rigidity area. After ends, with different arc lengths, of sections at upper and lower layers of the bump foils are aligned, the other ends are caused to have height difference as a result of thickness of foils, so that a first wedge shape is formed; micro gaps delta h are formed in middle areas of the bump foils, rigidity characteristics in step gradual change are formed, and the small-rigidity area with relatively small rigidity is formed; starting ends of the bump foils on each layer are completely superposed after being aligned and stacked together to form the large-rigidity area with relatively large rigidity. As a result of the wave-shaped guide effect of the large-rigidity area, self-adaptive regulation is generated, and relative positions of the bump foils on each layer are precisely positioned. Under action of load, deformation of different sizes is generated by the large-rigidity area and the small-rigidity area, so that height difference of delta h2 is caused, and a second wedge shape is formed on a junction. A gas film is further compressed, so that bearing capacity of the thrust bearing is improved.

Description

technical field [0001] The invention relates to the technical field of air dynamic pressure bearings, in particular to a thrust air foil bearing with high load capacity. Background technique [0002] The air dynamic pressure foil bearing uses the wedge effect. As the speed increases, the gas in the surrounding environment is dragged into the wedge due to the viscosity of the gas. When the speed rises to a certain level, the gas pressure in the wedge increases to support the rotor. Common corrugated foil thrust bearings such as figure 1 As shown, one end of the top foil of the thrust air foil bearing is fixed on the bottom plate of the thrust bearing seat, and the other end in a free state is supported by the corrugated foil between the top foil and the bottom plate of the thrust bearing seat. The two ends of the top foil create a height difference Form a wedge. The high-speed rotation of the thrust disc drags the air in the surrounding environment into the wedge. As the sp...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned existing technical deficiencies, and provide solutions to the relative position between the multi-layer corrugated foils and the serious problem of wedge-shaped deformation under large loads. At the same time, it is the first time to propose a thrust air foil with double wedges and high load-bearing capacity. Disc bearing

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