CN-113494528-B - Combined type gas thrust foil bearing device

Abstract

The invention provides a combined type gas thrust foil bearing device, which comprises a bottom plate assembly, wherein a gasket is arranged on the bottom plate assembly, a plurality of top foils and combined wave foils are clamped on the gasket and the bottom plate assembly, the gasket comprises an annular sheet body, radial grooves of the gasket are annularly arranged on the inner side of the circumference of the annular sheet body, bending parts are arranged at the end parts of the top foils and the combined wave foils of the device and are clamped on the radial grooves to be fixed on the gasket and the bottom plate, so that the top foils and the combined wave foils are in a natural state, the fixed end can not generate additional mechanical effect on the top foils and the wave foils, the thickness of the gasket can be adjusted to adjust the angle between the top foils and the combined wave foils, the combined wave foils can be formed by sectional wave foils and sectional flat foils with different widths, the rigidity and the bearing capacity of the whole combined wave foils can be changed through the combination of the sectional wave foils and the sectional flat foils with different widths, and the specific requirements under different working conditions can be adapted.

Inventors

• AN QI
• WANG XU
• XU HAOJIE
• Shao Congpeng
• FENG WEIJUN
• ZHANG JIE
• ZHU JINGWEI

Assignees

• 苏州昌恒精密金属压铸有限公司

Dates

Publication Date

20260512

Application Date

20210708

Claims (8)

1. 1. The combined type gas thrust foil bearing device comprises a bottom plate assembly, and is characterized in that a gasket is arranged on the bottom plate assembly, and a plurality of top foils and combined wave foils are clamped on the gasket and the bottom plate assembly; The top foil comprises a top foil arc-shaped sheet, and a top foil bending part is arranged at the end part of the top foil arc-shaped sheet; The corrugated foil assembly comprises a gasket, and is characterized in that a corrugated foil bending part is arranged at the end part of the combined corrugated foil, the corrugated foil bending part extends into the top foil bending part, the top foil bending part is clamped in the radial groove, the corrugated foil bending part is positioned at the lower part of the gasket, and the gasket is positioned between the top foil and the combined corrugated foil.
2. 2. The combined type gas thrust foil bearing device of claim 1, wherein the base plate assembly comprises a supporting base plate and a base plate adding layer positioned at the lower part of the supporting base plate, the base plate adding layer and the supporting base plate are connected through a plurality of cylindrical pins, the supporting base plate is provided with a base plate radial groove corresponding to the gasket radial groove, and the base plate adding layer is provided with a groove or a through hole corresponding to the gasket radial groove.
3. 3. The combination gas thrust foil bearing assembly of claim 2, wherein the cylindrical pin passes through the spacer and connects the spacer and the base plate assembly in combination.
4. 4. The combined gas thrust foil bearing arrangement of claim 2, wherein the top foil fold and the wave foil fold pass through the base plate radial slot.
5. 5. The combined gas thrust foil bearing arrangement of claim 1, wherein the combined wave foil includes at least one set of staggered segmented flat foils and segmented wave foils arranged in an axial alignment.
6. 6. The combination gas thrust foil bearing assembly of claim 1, wherein said top foil and combination wave foil are circumferentially disposed on said spacer and said base plate assembly.
7. 7. The combined gas thrust foil bearing arrangement of claim 1, wherein the top foil fold and the wave foil fold are L-shaped.
8. 8. The combined gas thrust foil bearing assembly of claim 1, wherein an upper surface of the top foil is provided with a wear resistant coating.

Description

Combined type gas thrust foil bearing device Technical Field The invention relates to the field of dynamic pressure gas bearings, in particular to a combined gas thrust foil bearing device. Background The aerodynamic foil bearing is applied to the military field such as the aerospace field at the earliest in the 70 th century, in particular to the corrugated foil bearing in the United states, and is widely applied to the onboard turbines, turbine refrigerators, automobile turbochargers and the like of civil aircraft such as boeing and fighter aircraft such as phantom in the eighth nineties. Korean also applied the aerodynamic foil bearing to a high-speed centrifugal blower, and various centrifugal blowers and compressors have been developed. However, the air dynamic pressure foil bearing theory research is not perfect so far, the design rule of universality is not available, standardization and serialization are difficult, each bearing structure and design parameter are required to be independently researched, developed and tested, the manufacturing process is complex, the development investment is huge, and the technological level requirement is high. Thus, in recent years, some countries have been working on developing foil bearings of respective characteristics, which are expected to be successfully applied to various types of high-speed turbomachinery. Foil type thrust gas bearings currently used in the field of high-speed turbomachinery are still most widely used in the U.S. wave foil type structure. In the prior art, most of the patents related to the gas thrust foil bearing are of integral structures, for example, the patent publication No. CN105202027B discloses a hybrid dynamic pressure gas thrust bearing, which has the following defects that 1, an outer disc and an inner disc are matched together to fix a foil, one end of the foil is fixed on the inner end face of the outer disc, then the inner disc and the outer disc squeeze the foil to be fixed for positioning, the fixed position of the foil fixed by the integral structure is provided with additional force which is not in a natural state and affects the performance of the gas thrust foil bearing, and 2, the foil is of integral fixed structure, the rigidity and the damping of the foil cannot be adjusted, and the best performance cannot be realized according to actual needs. Disclosure of Invention In order to solve the technical problems, the invention provides a combined type gas thrust foil bearing device, which comprises a bottom plate assembly, wherein a gasket is arranged on the bottom plate assembly, and a plurality of top foils and combined wave foils are clamped on the gasket and the bottom plate assembly; The top foil comprises a top foil arc-shaped sheet, and a top foil bending part is arranged at the end part of the top foil arc-shaped sheet; The corrugated foil assembly comprises a gasket, and is characterized in that a corrugated foil bending part is arranged at the end part of the combined corrugated foil, the corrugated foil bending part extends into the top foil bending part, the top foil bending part is clamped in the radial groove, the corrugated foil bending part is positioned at the lower part of the gasket, and the gasket is positioned between the top foil and the combined corrugated foil. Preferably, the cylindrical pin penetrates through the gasket and connects the gasket and the bottom plate assembly in a combined mode. Preferably, the bottom plate assembly comprises a supporting bottom plate and a bottom plate adding layer positioned at the lower part of the supporting bottom plate, the bottom plate adding layer and the supporting bottom plate are connected through a plurality of cylindrical pins, the supporting bottom plate is provided with a bottom plate radial groove corresponding to the gasket radial groove, and the bottom plate adding layer is provided with a groove or a through hole corresponding to the gasket radial groove. Preferably, the top foil fold and the corrugated foil fold pass through the bottom plate radial slot. Preferably, the combined wave foil comprises at least one group of staggered segmented flat foils and segmented wave foils, and the segmented flat foils and the segmented wave foils are axially arranged. Preferably, the top foil and the combined wave foil are circumferentially arranged on the gasket and the bottom plate assembly. Preferably, the top foil bent portion and the corrugated foil bent portion are L-shaped. Preferably, the upper surface of the top foil is provided with a wear resistant coating. The combined type gas thrust foil bearing device has the advantages that 1, bending parts are arranged at the end parts of the top foil and the combined wave foil and clamped on radial grooves to be fixed on gaskets and bottom plates, so that the top foil and the combined wave foil are in a natural state, the fixed ends can not generate additional mechanical effects on the top foil and the wave