Elastic foil dynamic pressure air flotation radial bearing, motor and air compressor

Abstract

The invention provides an elastic foil dynamic pressure air floatation radial bearing, a motor and an air compressor, the elastic foil dynamic pressure air floatation radial bearing comprises a bearing seat, a top foil arranged in an inner hole of the bearing seat and a supporting foil supported between the inner hole of the bearing seat and the peripheral wall of the top foil, and the top foil is of a whole circle structure. According to the radial bearing, interference of the free end does not exist in the inner circle of the top foil of the bearing, the bearing area is increased, and therefore the bearing performance of the radial bearing can be improved, and the phenomenon of gas film end leakage at the free end of the top foil in the prior art is thoroughly eradicated.

Description

technical field [0001] The invention belongs to the technical field of foil bearing design, and in particular relates to an elastic foil dynamic pressure air bearing radial bearing, a motor and an air compressor. Background technique [0002] Gas dynamic pressure bearing (also known as dynamic pressure air bearing) is a dynamic pressure gas bearing with elastic support, such as figure 1 shown. The high-speed rotation of the rotating shaft 101 drives the gas flow between the bearing 102 and the rotating shaft 101, and the viscous gas enters the wedge-shaped area to generate a hydrodynamic pressure effect, forming a high-pressure gas film 103 (also called a dynamic pressure gas film). When the pressure of the high-pressure gas film 103 is large enough, the The rotating shaft 101 rotating at high speed can be suspended. When the rotating shaft rotates at high speed, the high-pressure air film 103 squeezes the bearing 102, and both the top foil (also called the top foil) and t...

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Problems solved by technology

[0003] An air-bearing radial bearing and foil are disclosed in the prior art. The inner foil 2 has a working surface facing the rotation axis and a non-rotating surface away from the rotation axis. The working surface, as shown in Figure 2, uses two The inner foils in the opposite direction of rotation are built with each other to improve the radial foil wear. The free end of the inner foil is curled and extended to the fixed end, so the inner diameter of the local area of ​​the fixed end becomes smaller, which will greatly reduce the nominal design clearance of the bearing. Affect the performance of the bearing

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