CN115929790A - Hybrid foil gas thrust bearing - Google Patents
Hybrid foil gas thrust bearing Download PDFInfo
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- CN115929790A CN115929790A CN202210040786.4A CN202210040786A CN115929790A CN 115929790 A CN115929790 A CN 115929790A CN 202210040786 A CN202210040786 A CN 202210040786A CN 115929790 A CN115929790 A CN 115929790A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a dynamic and static pressure mixed foil gas thrust bearing, which comprises a dynamic and static pressure mixed foil gas thrust bearing body, wherein a small hole restrictor, a lever displacement amplifying mechanism and an air groove are arranged on the bearing body in an embedded mode. The small-hole throttler comprises an air outlet groove, and an air outlet end of the air outlet groove is provided with a pressure equalizing cavity; the air outlet groove and the pressure equalizing cavity form a pressure equalizing structure; the lever displacement amplification mechanism includes a lever and a compression spring. The wedge-shaped surface between the foil and the thrust disc can be lifted by the lever, so that the bearing capacity of the bearing is effectively improved, meanwhile, the gas flowing out of the pressure equalizing cavity moves in the circumferential direction, so that a gas film of the gas thrust bearing with the dynamic foil in the running process is formed, the phenomenon that the gas film is not easily formed due to the lifting of the wedge-shaped surface is avoided, the pressure of the gas film is further improved by the output gas, and the bearing capacity of the bearing is enhanced.
Description
Technical Field
The invention belongs to the field of machinery, and particularly relates to a hybrid foil gas thrust bearing.
Background
The aerostatic bearing is a sliding bearing taking gas as a lubricant, and the gas is forcibly pumped into a gap between the bearing and a shaft through an external pressurized gas source to form an air film so as to balance external load. The air hydrostatic bearing is separated by a pressure air film in the starting and running processes, the shaft and the bearing are not directly contacted to generate friction, and the friction force is only from the gas viscosity, so that the friction force is small, no friction and wear are caused, and the service life is long; the hydrostatic bearing has the effect of homogenizing errors, and can effectively reduce the error influence in the bearing machining and assembling processes, so that the aerostatic bearing has high rotation precision. However, hydrostatic bearings also have a number of disadvantages, such as poor stability, low stiffness and the need for high supply pressures. The aerodynamic bearing receives a load by forming an air film by dynamic pressure generated when the bearing rotates at a high speed. The dynamic pressure bearing has stable motion and good vibration resistance, and does not need large external air supply pressure. Although the dynamic pressure foil gas thrust bearing is easy to form a gas film in operation due to the large wedge-shaped surface between the foil and the thrust disc, the bearing capacity of the dynamic pressure foil gas thrust bearing is insufficient; meanwhile, in the starting and stopping processes of the dynamic pressure bearing, the thrust disc is in direct contact friction with the top foil of the bearing, and friction and abrasion are easy to generate. The porous hydrostatic bearing has high bearing capacity and static rigidity, uniform pressure distribution and good dynamic stability. Therefore, how to combine the advantages of the bearing and the bearing, and overcome the disadvantages of the bearing and the bearing becomes an important problem for designing the hybrid foil gas thrust bearing.
Disclosure of Invention
In order to solve the problems, the invention provides a hybrid foil gas thrust bearing. In order to meet the harsh requirement of stable operation of the turbine machinery on the high bearing capacity of the dynamic foil gas thrust bearing, the gas groove is formed in the bearing body, and the lever displacement amplification mechanism is arranged to raise the wedge-shaped surface between the foil and the thrust disc, so that the high bearing capacity of the foil gas thrust bearing is realized; and a small-hole restrictor is added to enable the gas to move circumferentially, so that the phenomenon that a gas film is not easily formed due to the lifting of the wedge-shaped surface is avoided.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a hybrid foil gas thrust bearing of dynamic and static pressure comprises a bearing body, wherein a small-hole throttler, a lever displacement amplification mechanism and a specially-arranged gas groove are arranged on the bearing body, the small-hole throttler comprises a gas outlet groove, a pressure equalizing cavity is formed at the gas outlet end of the gas outlet groove, and the gas outlet groove and the pressure equalizing cavity form a pressure equalizing structure, so that a bearing gas film is favorably formed; the lever displacement amplifying mechanism mainly comprises a lever and a compression spring, the upper end and the lower end of the spring are respectively fixed with the bearing body and the lever, the top end of the lever is contacted with the bearing foil, and the bottom end of the lever is provided with a cylindrical bulge which is communicated with a small air outlet groove; when the air inlet groove is filled with high-pressure air, the high-pressure air coming out of the small air outlet groove can push the cylindrical protrusion of the lever upwards to enable the lever to be stressed so as to compress the spring, the spring moves axially, and the compression displacement of the spring is amplified through the lever to lift the wedge-shaped surface between the foil and the thrust disc, so that the bearing capacity of the bearing is improved.
Furthermore, a bearing shell of the dynamic pressure foil gas thrust bearing is circumferentially provided with a circular air inlet groove with a rectangular cross section, a bearing surface of the gas thrust bearing is circumferentially provided with a circular air outlet groove with a rectangular cross section, the circular air outlet groove is coaxially corresponding to a pressure equalizing cavity with a rectangular cross section arranged below a foil on the bearing shell, and the air inlet grooves corresponding to the air outlet grooves are intersected; the gas from the gas inlet groove can be uniformly distributed on the bearing surface of the dynamic pressure foil gas thrust bearing.
Further, the diameter of the air outlet groove is smaller than or equal to that of the pressure equalizing cavity.
Further, the small-hole throttlers are uniformly distributed on the bearing body.
Further, a ring-to-ring small hole restrictor is mounted on the bearing body; the inner diameters of the pressure equalizing cavities of the small-hole throttleers on the same ring are the same.
Further, a cavity with an n-shaped cross section is circumferentially arranged on a bearing shell of the dynamic pressure foil gas thrust bearing, and a downward small gas outlet groove is arranged in the cavity and is intersected with the gas inlet groove.
Furthermore, a lever displacement amplification mechanism is installed in the cavity, and the top end face of the lever displacement amplification mechanism is in contact with the foil and is on the same water surface with the upper end face of the bearing shell.
Furthermore, the bottom end of the lever displacement amplifying mechanism is provided with an upward circular bulge and a downward circular bulge with rectangular cross sections, the lower end bulge is coaxially communicated with the small air outlet groove arranged in the cavity, and the diameter of the bulge is slightly smaller than that of the air outlet groove.
Furthermore, a spring is installed on an upper projection of the lever displacement amplification mechanism, and the upper end of the spring is fixed with the bearing shell.
The technical scheme adopted by the invention has the following beneficial effects: the invention realizes the mutual combination of dynamic pressure and static pressure characteristics, and is mainly embodied in that the arranged lever displacement amplification mechanism is subjected to thrust through the bottom end, the lever compresses the spring, the lever amplifies the displacement compressed by the spring to lift the wedge-shaped surface between the foil and the thrust disc, so as to improve the rigidity and the bearing capacity of the bearing, and the pressure equalizing structure formed by the air outlet groove and the pressure equalizing cavity is used for avoiding the result that an air film is difficult to form due to the lifting of the wedge-shaped surface, and simultaneously enhancing the pressure of the air film, so as to improve the bearing capacity of the air thrust bearing.
Drawings
FIG. 1 is an exploded view of the present invention;
FIG. 2 is a general assembly view of the present invention;
FIG. 3 is a front elevational view of the general assembly of the present invention;
FIG. 4 is a partial cross-sectional view of the general assembly and an enlarged view of the installation of the present invention;
FIG. 5 is a schematic view of the lever displacement amplifying mechanism of the present invention.
Detailed description of the preferred embodiments
The technical scheme of the invention is further explained by the specific embodiment in combination with the attached drawings.
As shown in fig. 1 and 2, the hybrid dynamic-static foil gas thrust bearing mainly comprises an integrated dynamic-pressure foil gas thrust bearing body 3, a top foil 1, a bump foil 2 and a lever displacement amplification mechanism 4, wherein the lever displacement amplification mechanism is arranged in a cavity 9 formed in a bearing body, the top end of a lever 11 is in contact with the foil 2 and is positioned on the same horizontal plane with the upper surface of the bearing body 3, the lever 11 is fixedly connected with the bearing body 3 through a spring 12, the spring 12 is fixedly connected with a cylindrical bulge 13 on the lever 11, and the lever displacement amplification mechanism 4 can axially move in the cavity 9.
The general assembly front view is shown in fig. 3, the general assembly partial cross-sectional view and the partial enlarged view of a pressure equalizing structure formed by the air outlet groove 6 and the pressure equalizing cavity 8 are shown in fig. 4, three circular air inlet grooves 5, air outlet grooves 6, small air outlet grooves 7 and cavities 9 with rectangular cross sections are formed in the bearing body 3, and the top foil 1 and the corrugated foil 2 are provided with the pressure equalizing cavity 8; the lever displacement amplifying mechanism 4 is arranged in the cavity, and the small air outlet groove 7 and the air outlet groove 6 are intersected with the air inlet groove 5 by the same axial lead; the cylindrical bulge 13 at the lower end of the lever 11 is arranged in the small air outlet groove 7, the diameter of the cylindrical bulge 13 is equal to that of the small air outlet groove 7, and the length of the cylindrical bulge 13 is slightly shorter than that of the small air outlet groove 7, so that the lever displacement amplification mechanism 4 can axially move under the upward pressure of high-pressure air in the air inlet groove 5, a wedge-shaped surface between the foil and the thrust disc is lifted, and the bearing capacity of the bearing is enhanced; the diameter of the gas outlet groove 6 is smaller than that of the pressure equalizing cavity 8, the gas outlet groove 6 is communicated with the pressure equalizing cavity 8 in the same axis, and the gas outlet groove 6 and the pressure equalizing cavity 8 form a pressure equalizing structure, so that a gas film of the gas thrust bearing is formed.
FIG. 5 is a schematic diagram of the lever displacement amplifying mechanism 4 of the present invention, wherein the lever 11 and the spring 12 form the lever displacement amplifying mechanism 4, and the lever 11 is provided with cylindrical protrusions 13 and 14; the cylindrical projection 13 is fixedly connected with the spring 12, the cylindrical projection 14 transmits the thrust of high-pressure gas applied to the cylindrical projection to the spring 12, the spring 12 is compressed, and the compression displacement is amplified through the lever 11 to lift the wedge-shaped surface between the foil and the thrust disc.
The foregoing shows and describes the general principles and features of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A hybrid foil gas thrust bearing is characterized by comprising a hybrid foil gas thrust bearing body (3), wherein a small hole restrictor and a lever displacement amplification mechanism (4) are mounted on the bearing body, the small hole restrictor comprises an air inlet groove (5) and an air outlet groove (6), and an even pressure cavity (8) is formed at the air outlet end of the air outlet groove (6); the air outlet groove (6) and the pressure equalizing cavity (8) form a pressure equalizing structure; thereby forming the air film more easily; the lever displacement amplification mechanism (4) comprises a lever (11) and a spring (12), high-pressure gas is introduced into the gas inlet groove (5), and the bottom end of one side of the lever (11) is compressed by the gas pressure from the gas outlet groove (7) so that the lever (11) moves axially to lift the wedge-shaped surface between the foil and the thrust disc, and therefore the bearing capacity of the bearing is improved.
2. The hybrid foil gas thrust bearing according to claim 1, wherein the lever is an η -shaped lever (11), and a cylindrical protrusion (14) is provided at the bottom end of the lever (11) to communicate with the small gas outlet groove (7); the upper end of the spring (12) is fixed on the bearing, the lower end of the spring is fixed on the cylindrical bulge (13) of the lever (11), and the top end of the lever (11) is in contact with the bearing foil (2).
3. Hybrid foil gas thrust bearing according to claim 1, characterized in that the diameter of the outlet groove (5) is smaller than or equal to the diameter of the pressure-equalizing chamber (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210040786.4A CN115929790A (en) | 2022-01-14 | 2022-01-14 | Hybrid foil gas thrust bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210040786.4A CN115929790A (en) | 2022-01-14 | 2022-01-14 | Hybrid foil gas thrust bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115929790A true CN115929790A (en) | 2023-04-07 |
Family
ID=86654657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210040786.4A Pending CN115929790A (en) | 2022-01-14 | 2022-01-14 | Hybrid foil gas thrust bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115929790A (en) |
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2022
- 2022-01-14 CN CN202210040786.4A patent/CN115929790A/en active Pending
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