CN111637149A - Foil gas bearing with elastic damping structure - Google Patents
Foil gas bearing with elastic damping structure Download PDFInfo
- Publication number
- CN111637149A CN111637149A CN202010459369.4A CN202010459369A CN111637149A CN 111637149 A CN111637149 A CN 111637149A CN 202010459369 A CN202010459369 A CN 202010459369A CN 111637149 A CN111637149 A CN 111637149A
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- China
- Prior art keywords
- foil
- elastic ring
- bearing
- elastic
- wire mesh
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/02—Sliding-contact bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
- F16F15/1213—Spiral springs, e.g. lying in one plane, around axis of rotation
Abstract
A foil gas bearing with an elastic damping structure comprises an inner bearing sleeve, wherein a foil element is fixed in the inner part of the inner bearing sleeve, an elastic ring is arranged outside the inner bearing sleeve, a metal wire mesh is filled between the elastic ring and an outer bearing sleeve, and the outer bearing sleeve is connected with a bearing end cover through a bolt; the elastic ring is in a thin-wall cylindrical structure, the inner wall and the outer wall of the elastic ring are provided with an inner boss and an outer boss, and a metal wire mesh is filled between the two outer bosses; the foil element is divided into a top foil and a wave foil, the top foil is formed by curling a single flat foil into a smooth flexible inner surface, the wave foil is divided into a plurality of strip foils with different widths and structural parameters along the axial direction and the circumferential direction, the corrugated bulges on the adjacent strip wave foils are distributed in a staggered way, and the top foil and the wave foil are matched with each other to form an arc surface; the elastic damping structure is formed by the elastic ring and the metal wire mesh, so that vibration energy of the rotor when the rotor is over critical is consumed, vibration and impact of the high-speed rotor system during operation are absorbed, the increase of the amplitude of the rotor is inhibited, and the motion stability of the high-speed rotor system is improved.
Description
Technical Field
The invention relates to the technical field of foil gas bearings, in particular to a foil gas bearing with an elastic damping structure.
Background
In modern high-speed rotating machinery such as a turbocharger, an aircraft engine, a gas turbine and the like, a rotor usually works above a first-order critical rotating speed or even a multi-order critical rotating speed, when the rotor is close to or accelerates to pass through the critical rotating speed, the rotor system has very large vibration or even instability, and the vibration problem is an important factor influencing the reliability of the high-speed rotor system all the time.
The vibration problem of the high-speed rotor can be generally suppressed by increasing the consumption of vibration energy and changing the natural frequency of the rotor, wherein the former suppresses the vibration amplitude of the rotor by applying a damper to the rotor and introducing external damping to a rotor system to consume the vibration energy of the rotor; in the latter, an elastic support is generally adopted to replace a rigid support, the rotor support rigidity is reduced, so that the critical rotating speed of the rotor is reduced, the vibration amplitude of the rotor when the rotor is over-critical is reduced, the working rotating speed of the rotor is far away from the critical rotating speed, and the vibration response of the rotor to unbalance is reduced.
At present, the rotor system of a foreign gas turbine mostly adopts a form of parallel combination of an elastic support and a damper, firstly, the critical rotating speed of the rotor is reduced, the power frequency of the rotor is far away from the critical rotating speed, and a working band with wide rotating speed variation range and small vibration is provided for the rotor; and secondly, external damping is provided for the rotor system, and the supercritical vibration of the rotor is further reduced. It is therefore of great importance to investigate the combination of elastic support and damper.
The foil gas bearing is used as an important branch of a gas dynamic pressure lubrication technology, gas is used as a lubrication medium, gas film pressure is generated on the surface of the bearing through a dynamic pressure effect to enable a rotor to be suspended, the rigidity and damping are provided for the bearing through elastic deformation and coulomb friction by a foil supporting structure, and the adaptability of the bearing is greatly improved. Compared with a rolling bearing or a sliding bearing, the foil gas bearing has the advantages of low friction power consumption, wide working temperature range, allowable bearing clearance loss, impact resistance and the like.
Although foil gas bearings have many advantages, there are also a number of problems that are difficult to avoid: the bearing capacity of the foil gas bearing is low due to the low viscosity of the gas as a lubricating medium; and the inherent properties of the gas lubrication medium and the foil supporting structure enable the damping of the gas foil bearing to be small, subsynchronous vibration can occur when the rotating speed of the rotor is too high, the vibration amplitude of the system is too large, and the high-speed stability of the rotor system needs to be improved.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, the present invention provides a foil gas bearing having an elastic damping structure, which can effectively absorb vibration and impact during the operation of a high-speed rotor system, and suppress the increase of the amplitude of the rotor, thereby improving the motion stability of the high-speed rotor system.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a foil gas bearing with elastic damping structure, includes inner bearing housing 4, and inner bearing housing 4 is inside to be fixed with foil element 6, and inner bearing housing 4 outside is equipped with elastic ring 5, and it has wire mesh 7 to fill between elastic ring 5 and the outer bearing housing 3, and outer bearing housing 3 and bearing end cover 2 pass through bolt 1 and connect.
The elastic ring 5 is a thin-wall cylinder structure, the inner wall and the outer wall of the elastic ring are respectively provided with an inner boss and an outer boss which are regularly rectangular, the inner boss and the outer boss are distributed in a staggered manner and are also uniformly distributed along the circumferential direction of the elastic ring, and the number and the width parameters of the inner boss and the outer boss are calculated by the strength of the elastic ring.
The elastic ring 5 is divided into a split type and an integrated type, when the span of the foil gas bearing is small, the integrated type is adopted, the middle part of the integrated type elastic ring 5 is provided with an opening for fixing the pin, the length of the inner boss and the outer boss is greater than the width of the foil gas bearing, and the height of the outer boss is greater than that of the inner boss; the foil gas bearing is split when the span is large.
The wire mesh 7 is filled between every two outer bosses of the elastic ring 5, the wire mesh 7 is limited by the outer bosses of the elastic ring 5, the outer bearing sleeve 3 and the bearing end cover 2, the elastic ring 5 has high rigidity but low damping, and the wire mesh 7 has low rigidity and high damping.
The metal wire mesh 7 is coiled by metal wires into a spiral shape, and is formed by stretching, weaving, pressurizing and heat treatment, and the length and width parameters of the metal wire mesh 7 can be calculated by consuming damping required by bearing vibration.
The foil element 6 is divided into a top foil and a wave foil, the top foil is formed by curling a single flat foil into a smooth flexible inner surface, the wave foil is divided into a plurality of strip foils with different widths and structural parameters along the axial direction and the circumferential direction, the corrugated bulges on the adjacent strip wave foils are distributed in a staggered mode, and the top foil and the wave foil are matched with each other to form an arc-shaped surface.
The center of a circle formed by the top foil is inclined upwards, and the rotor is concentric with a three-circle formed by the outward protrusion in the elastic ring under the action of gravity.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the foil gas bearing with the elastic damping structure, the bump foil in the foil element is divided into a plurality of strip foils with different widths and structural parameters along the axial direction and the circumferential direction, the bump protrusions on the adjacent strip foils are distributed in a staggered mode, the bumps on the single foil can be arranged in a plurality of modes, and the good bump foil distribution mode enables the structural rigidity of the foil gas bearing to be adjusted in the axial direction and the circumferential direction according to the gas film pressure and gas film thickness distribution characteristics, so that the ultimate bearing capacity and the system stability of the bearing are greatly improved.
The wire mesh is an elastic porous substance and has the characteristics of high damping and high elasticity. When the rotor is in a working state, the inner bearing sleeve extrudes the elastic ring under the action of eccentric force so as to extrude the metal wire mesh, and the elastic ring and the metal wire mesh are mutually coupled to provide enough rigidity and damping for the supporting system; the rigidity and the damping of the wire mesh are increased along with the increase of the eccentric force when the rotating speed of the rotor is increased, so that sufficient damping can be provided, the pressure distribution of the inner bearing sleeve is improved, the vibration reduction characteristic of the whole supporting system is improved, and larger unbalanced force can be adapted.
According to the foil gas bearing with the elastic damping structure, the foil structure can change the supporting rigidity of the rotor and reduce the vibration energy of a high-speed rotor system during operation; the elastic damping structure can effectively absorb vibration and impact generated during the operation of the high-speed rotor system, and the vibration and the impact are matched with each other to jointly inhibit the increase of the amplitude of the rotor, so that the operation stability of the high-speed rotor system is improved.
Drawings
Fig. 1 is a radial cross-sectional view of a foil gas bearing having an elastic damping structure according to the present invention.
Fig. 2 is an axial sectional view of a foil gas bearing having an elastic damping structure according to the present invention.
Fig. 3 is a cross-sectional view of the split elastic ring structure of the present invention.
Fig. 4 is a structural view of an elastic damping structure composed of a wire mesh and an elastic ring.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
Referring to fig. 1 and 2, the foil gas bearing with the elastic damping structure comprises an inner bearing sleeve 4, a foil element 6 is fixed inside the inner bearing sleeve 4, an elastic ring 5 is arranged outside the inner bearing sleeve 4, the elastic ring 5 is of an integrated structure, a metal wire mesh 7 is filled between the elastic ring 5 and an outer bearing sleeve 3, and the outer bearing sleeve 3 is connected with a bearing end cover 2 through a bolt 1.
Referring to fig. 3, the elastic ring 5 of the foil gas bearing with the elastic damping structure is a split structure.
The foil element 6 is divided into a top foil and a wave foil, the top foil is formed by curling a single flat foil into a smooth flexible inner surface, the wave foil is divided into a plurality of strip foils with different widths and structural parameters along the axial direction and the circumferential direction, the corrugated bulges on the adjacent strip wave foils are distributed in a staggered mode, and the top foil and the wave foil are matched with each other to form an arc-shaped surface so as to provide structural rigidity and damping performance for the rotor.
The foil element 6 changes rigid support into flexible support, so that the rotor support rigidity is reduced, and the vibration amplitude of the rotor in the over-critical state is reduced; the center of the circle formed by the top foil is inclined upwards, and the rotor is concentric with the three circles formed by the inner and outer bulges of the elastic ring 5 under the action of gravity.
Referring to fig. 4, the elastic ring 5 is a thin-walled cylinder structure, and the inner and outer walls thereof are provided with regular rectangular inner and outer bosses which are distributed in a staggered manner and are uniformly distributed along the periphery of the elastic ring; the number and width parameters of the inner boss and the outer boss can be calculated by the strength of the elastic ring. A metal wire mesh 7 is filled between every two outer bosses of the elastic ring, the metal wire mesh 7 is limited by the two outer bosses of the elastic ring 5, the outer bearing sleeve 3 and the bearing end cover 2, wherein the elastic ring 5 has high rigidity and low damping, the metal wire mesh 7 has low rigidity and high damping, and the elastic ring 5 and the metal wire mesh 7 jointly form an elastic damping structure to consume the vibration energy of the rotor when the rotor is over critical; the damping of the wire mesh is a nonlinear increasing function of the eccentricity of the shaft neck, the damping is basically linear damping under the condition of smaller eccentricity, and the damping can increase nonlinearly as the eccentricity is larger or the rotating speed of the rotor is increased, so that the wire mesh has a considerable effect on the inhibition of the rotor amplitude, particularly the inhibition of the critical amplitude.
The elastic ring 5 has strong self-adaptability, and during work, under the interaction of the wire mesh 7 and the unbalanced force of the rotor, the contact state of the inner boss and the outer boss of the elastic ring 5 is constantly changed, even sliding displacement occurs, so that the supporting rigidity and the critical rotating speed are changed, and a possibly large vibration peak value is avoided.
The above examples are only preferred embodiments of the present invention, and all simple equivalent changes and modifications made in the claims and the specification of the present invention should be covered by the protection of the present invention.
Claims (7)
1. A foil gas bearing with an elastic damping structure, comprising an inner bearing sleeve (4), a foil element (6) being fixed inside the inner bearing sleeve (4), characterized in that: an elastic ring (5) is arranged outside the inner bearing sleeve (4), a metal wire mesh (7) is filled between the elastic ring (5) and the outer bearing sleeve (3), and the outer bearing sleeve (3) is connected with the bearing end cover (2) through a bolt (1).
2. The foil gas bearing with elastic damping structure of claim 1, wherein: the elastic ring (5) is of a thin-wall cylindrical structure, the inner wall and the outer wall of the elastic ring are respectively provided with an inner boss and an outer boss which are regular rectangular, the inner boss and the outer boss are distributed in a staggered manner and are also uniformly distributed along the circumferential direction of the elastic ring, and the number and the width parameters of the inner boss and the outer boss are calculated by the strength of the elastic ring.
3. The foil gas bearing with elastic damping structure of claim 1, wherein: the elastic ring (5) is divided into a split type and an integrated type, when the span of the foil gas bearing is small, the integrated type is adopted, the middle part of the integrated type elastic ring is provided with a hole for fixing the pin, the length of the inner boss and the outer boss is greater than the width of the foil gas bearing, and the height of the outer boss is greater than that of the inner boss; the foil gas bearing is split when the span is large.
4. The foil gas bearing with elastic damping structure as claimed in claim 2, wherein: the wire mesh (7) is filled between every two outer bosses of the elastic ring (5), the wire mesh (7) is limited by the outer bosses of the elastic ring (5), the outer bearing sleeve (3) and the bearing end cover (2), the elastic ring (5) has high rigidity but low damping, and the wire mesh (7) has low rigidity and high damping.
5. The foil gas bearing with elastic damping structure of claim 1, wherein: the metal wire mesh (7) is coiled by metal wires into a spiral shape, and is formed by stretching, weaving, pressurizing and heat treatment, and the length and width parameters of the metal wire mesh (7) can be calculated by consuming damping required by bearing vibration.
6. The foil gas bearing with elastic damping structure of claim 1, wherein: the foil element (6) is divided into a top foil and a wave foil, the top foil is formed by curling a single flat foil into a smooth flexible inner surface, the wave foil is divided into a plurality of strip foils with different widths and structural parameters along the axial direction and the circumferential direction, the corrugation bulges on the adjacent strip wave foils are distributed in a staggered mode, and the top foil and the wave foil are matched with each other to form an arc-shaped surface.
7. The foil gas bearing with elastic damping structure as claimed in claim 6, wherein: the center of the circle formed by the top foil is inclined upwards, and the rotor is concentric with a three-circle formed by the outward protrusion of the elastic ring under the action of gravity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010459369.4A CN111637149A (en) | 2020-05-27 | 2020-05-27 | Foil gas bearing with elastic damping structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010459369.4A CN111637149A (en) | 2020-05-27 | 2020-05-27 | Foil gas bearing with elastic damping structure |
Publications (1)
| Publication Number | Publication Date |
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| CN111637149A true CN111637149A (en) | 2020-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010459369.4A Pending CN111637149A (en) | 2020-05-27 | 2020-05-27 | Foil gas bearing with elastic damping structure |
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| Country | Link |
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| CN (1) | CN111637149A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027907A (en) * | 2021-03-22 | 2021-06-25 | 西安交通大学 | Elastic ring-elastic foil combined radial bearing |
| CN113494529A (en) * | 2021-08-07 | 2021-10-12 | 苏州昌恒精密金属压铸有限公司 | Unit ring combined type wave foil type radial air bearing |
| CN113803367A (en) * | 2021-11-18 | 2021-12-17 | 天津飞旋科技股份有限公司 | Foil dynamic pressure bearing, casting mold and shaft system |
| CN114198390A (en) * | 2021-12-16 | 2022-03-18 | 中车株洲电机有限公司 | Radial foil air bearing |
| CN114352362A (en) * | 2021-12-07 | 2022-04-15 | 浙江意动科技股份有限公司 | Elastic support structure, bearing support using same and flexible rotor |
| CN115789085B (en) * | 2023-02-20 | 2023-04-25 | 天津飞旋科技股份有限公司 | Foil dynamic pressure air bearing and shafting |
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| CN103438091A (en) * | 2013-08-02 | 2013-12-11 | 湖南大学 | Aero dynamic bearing with metal rubber and elastic chaff composite support structure |
| JP5644547B2 (en) * | 2011-01-27 | 2014-12-24 | 株式会社島津製作所 | Dynamic pressure gas bearing |
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| CN108730330A (en) * | 2018-08-09 | 2018-11-02 | 北京瑞深航空科技有限公司 | The method of adjustment of compliant foil air bearing and its rigidity and damping |
| CN110735853A (en) * | 2019-12-23 | 2020-01-31 | 潍坊富源增压器有限公司 | Elastic foil type dynamic pressure air bearing |
| CN111120514A (en) * | 2020-01-19 | 2020-05-08 | 至玥腾风科技集团有限公司 | Air bearing comprising self-adaptive damper |
-
2020
- 2020-05-27 CN CN202010459369.4A patent/CN111637149A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009022943A1 (en) * | 2007-08-13 | 2009-02-19 | Yury Ivanovich Ermilov | Multiblade gasodynamic bearing |
| JP5644547B2 (en) * | 2011-01-27 | 2014-12-24 | 株式会社島津製作所 | Dynamic pressure gas bearing |
| CN102927124A (en) * | 2012-10-10 | 2013-02-13 | 西安交通大学 | Multi-layer bubbled foil radial dynamic pressure gas bearing |
| CN103438091A (en) * | 2013-08-02 | 2013-12-11 | 湖南大学 | Aero dynamic bearing with metal rubber and elastic chaff composite support structure |
| CN104454992A (en) * | 2014-09-30 | 2015-03-25 | 湖南大学 | Elastic radial air bearing |
| CN106286701A (en) * | 2016-10-14 | 2017-01-04 | 西安交通大学 | A kind of elastic circular antivibrator with metal-rubber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027907A (en) * | 2021-03-22 | 2021-06-25 | 西安交通大学 | Elastic ring-elastic foil combined radial bearing |
| CN113494529A (en) * | 2021-08-07 | 2021-10-12 | 苏州昌恒精密金属压铸有限公司 | Unit ring combined type wave foil type radial air bearing |
| CN113803367A (en) * | 2021-11-18 | 2021-12-17 | 天津飞旋科技股份有限公司 | Foil dynamic pressure bearing, casting mold and shaft system |
| CN114352362A (en) * | 2021-12-07 | 2022-04-15 | 浙江意动科技股份有限公司 | Elastic support structure, bearing support using same and flexible rotor |
| CN114198390A (en) * | 2021-12-16 | 2022-03-18 | 中车株洲电机有限公司 | Radial foil air bearing |
| CN115789085B (en) * | 2023-02-20 | 2023-04-25 | 天津飞旋科技股份有限公司 | Foil dynamic pressure air bearing and shafting |
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Application publication date: 20200908 |