A kind of multi-layer bubbling foil dynamic pressure gas thrust bearing

Abstract

The invention discloses a dynamic pressure gas thrust bearing with multiple layers of bubbling foils. The dynamic pressure gas thrust bearing comprises a bearing seat and a shaft, wherein the shaft with a rotor thrust plate is arranged in the bearing seat, a plurality of groups of elastic components with the same structure are arranged between the bearing seat and the rotor thrust plate, and the elastic components are uniformly arranged along the circumferential direction of the bearing seat; each elastic component comprises the multiple layers of bubbling foils and a flat foil, the multiple layers of bubbling foils are arranged above the bearing seat, and the flat foil is arranged between a top bubbling foil and the rotor thrust plate and fits with an elastic bubbling foil; bubbling bulges are formed on each bubbling foil; and one end of the elastic component is fixed on the bearing seat by a locating component, and the other end of the elastic component is free. By virtue of the elastic components which are arranged in sections and composed of the flat foils and the bubbling foils, the rigidity distribution and the assembly character of the bearing are improved, and unstable whirling motion of a rotor is effectively restrained. According to the bearing with the multiple layers of bubbling foils, multiple adaptability rigidities are generated by multiple layers of supporting, the rigidity variation range of the bearing is extended, and the rigidity character of the foil bearing is improved.

Description

technical field [0001] The invention belongs to the field of dynamic pressure gas bearings in mechanical design, and particularly designs a multilayer bubbling foil dynamic pressure gas thrust bearing. Background technique [0002] With the development of technologies in the fields of aerospace, energy and power, in order to maintain the stability and reliability of high-speed machinery, higher and higher requirements are placed on lubrication technology. When the rotor speed is very high or the relative motion speed is very high, such as aircraft turbine engine or micro gas turbine, the friction caused by high-speed motion makes the oil temperature rise rapidly and cannot form an effective lubricating film, and the oil bearing can no longer meet the needs; When the working environment requires high purity, such as turbomachinery used in helium liquefaction devices and space refrigerators, if oil bearings are used, the working environment will be polluted. At this time, oth...

AI Technical Summary

Problems solved by technology

However, the rigidity of the traditional single-layer bubbling foil bearing bubbling support is relatively large, and the bubbling fulcrum has almost no deformation margin, which is likely to cause excessive friction on the bearing surface during the start-stop phase and during operation, causing friction damage to the bearing and rotor; and The surface stiffness of the single-layer foil bearing is consistent, and it cannot adapt to the change of the local support stiffness of the bearing with the load. application in

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