CN112112897A - Porous tilting pad bearing based on closed squeeze film damper - Google Patents
Porous tilting pad bearing based on closed squeeze film damper Download PDFInfo
- Publication number
- CN112112897A CN112112897A CN202011105567.7A CN202011105567A CN112112897A CN 112112897 A CN112112897 A CN 112112897A CN 202011105567 A CN202011105567 A CN 202011105567A CN 112112897 A CN112112897 A CN 112112897A
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- Prior art keywords
- squeeze film
- porous
- damper
- film damper
- shell
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
- F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
- F16C32/0618—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings via porous material
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
- F16C32/0677—Details of hydrostatic bearings independent of fluid supply or direction of load of elastic or yielding bearings or bearing supports
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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
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/20—Application independent of particular apparatuses related to type of movement
- F16C2300/22—High-speed rotation
Abstract
The invention discloses a porous tilting pad bearing based on a closed squeeze film damper, which comprises a bearing base, wherein the bearing base comprises a shell and a plurality of tiles arranged in the shell, the tiles surround an annular structure concentric with the shell, a squeeze film damper is arranged between the shell and the tiles, a cavity is formed in the squeeze film damper and filled with hydraulic oil, a shell of the squeeze film damper is of a compressible revolving body structure, one side of the tile, far away from the shell, is provided with a mounting groove, a porous material is arranged in the mounting groove, the porous material and the bottom of the mounting groove are arranged at intervals along the radial direction so as to enable the interval area to form an air cavity, and the bottom of the mounting groove is provided with a porous air supply hole communicated with the air cavity. The invention can generate larger damping through the arrangement of the squeeze film damper and the porous of the compressible revolving body structure, and is expected to be applied to megawatt-level turbomachinery.
Description
Technical Field
The invention relates to the technical field of bearings, and particularly provides a porous tilting pad bearing based on a closed squeeze film damper.
Technical Field
In industrial production, the working principle of the porous gas bearing is complex, when external driving force is not provided for a rotor and only an external gas source is provided, high-pressure gas permeates into the porous material through a gas inlet hole, and finally a gas film is formed in a bearing gap to support an external load; under such conditions, the bearing behaves as a purely hydrostatic gas bearing. When external high-pressure air pressure is not provided and only external driving force is provided for the rotor, the lubricating gas is brought into the wedge-shaped gap and forms a lubricating gas film to bear external load because the air flow has certain viscosity; the bearing then behaves as a purely hydrodynamic gas bearing. When an external air source and an external force for driving the rotor to rotate are provided at the same time, if the rotating speed is high, the dynamic pressure effect caused by the rotation of the rotor is not negligible, the higher the rotating speed is, the stronger the wedge effect and the dynamic pressure effect of the air film are, the larger the bearing capacity of the bearing is, and the more difficult the formed air film thickness distribution is to change under the condition, so that the bearing has higher rigidity.
In order to reduce the amplitude and improve the effective damping of the system, an extrusion oil film damper is widely applied in the industry at present. For example, the invention patent application with the application publication number of CN108916306A discloses a heavy rotor vibration suppression device, and specifically discloses a heavy rotor vibration suppression device which comprises a bearing sleeved on a shaft, wherein a sleeve is sleeved outside the bearing, a bearing seat is arranged outside the sleeve, a gap is formed between the sleeve and the bearing seat, O-shaped sealing rings are arranged at two ends of the outer surface of the sleeve, lubricating oil is filled in the gap, the two O-shaped sealing rings are matched with the sleeve and the bearing seat to form an extrusion film damper, a support plate is arranged on the bearing seat, a butterfly-shaped spring seat which is abutted against the sleeve is arranged in the support plate, an arc-shaped structure at the top of the butterfly-shaped. Above-mentioned application is when the rotor vibration, and belleville spring supporting seat department vibrates thereupon and is absorbed system part vibration energy by damping device for the squeeze film plays damped effect, reduces rotor vibration amplitude, makes entire system have certain damping, presses down the effect of shaking, but squeeze film attenuator is open, and the during operation avoids producing revealing of hydraulic oil, the polluted environment, and the damping effect remains further improvement simultaneously. In addition, the closed squeeze film damper is researched in foreign countries, threaded connection and rubber ring sealing are adopted, but the structure is complex, the shell is not compressible, and the vibration resistance is poor.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a porous tilting pad bearing based on a closed squeeze film damper, the squeeze film damper is introduced into the porous tilting pad bearing, the cross rigidity of the bearing is eliminated by adopting a tilting pad structure, the stability of a bearing-rotor system is improved, the rotation precision of the rotor system is improved, in addition, a shell of the squeeze film damper is made into a compressible revolving body structure, a cavity is formed in the revolving body, and hydraulic oil is filled in the cavity. When vibration is transmitted to the squeeze film damper through the tiles, the damper shell deforms under stress, hydraulic oil in the cavity flows in the cavity under the squeezing action, greater damping is generated, and vibration reduction and energy absorption effects are greatly improved.
The technical scheme includes that the bearing comprises a bearing base, the bearing base comprises a shell and a plurality of tiles arranged in the shell, the tiles are enclosed into an annular structure concentric with the shell, an extruded oil film damper is installed between the shell and the tiles, a cavity is formed inside the extruded oil film damper, hydraulic oil is filled in the cavity, a shell of the extruded oil film damper is of a compressible revolving body structure, one side, far away from the shell, of each tile is provided with a mounting groove, a porous body is installed in each mounting groove, the porous body and the bottom of each mounting groove are arranged at intervals along the radial direction, so that air cavities are formed in the interval areas, and porous air supply holes communicated with the air cavities are formed in.
Further, an external air supply port is formed in the outer end face of the tile in the axial direction, and the external air supply port is communicated with the porous air supply hole.
Furthermore, a plurality of damper plungers are installed inside the squeeze film damper and are arranged in the cavity in a staggered mode.
Furthermore, a damper oil outlet is formed in one end, close to the shell, of the squeeze film damper and penetrates through the shell of the squeeze film damper, a through hole matched with the damper oil outlet is formed in the shell, and the damper oil outlet is installed in the through hole.
Furthermore, a double sealing ring is arranged between the shell of the squeeze film damper and the oil outlet of the damper.
Furthermore, one side of the porous material, which is far away from the bottom of the mounting groove, is higher than the top surface of the mounting groove, and the porous material is connected with the side surface of the mounting groove through filling glue.
Further, the number of the tiles is 4, and the interval between every two adjacent tiles is equal.
Furthermore, 2 squeeze film dampers are arranged between any tile and the shell.
Has the advantages that:
1. the invention provides a new idea and selection for improving the damping performance of the porous tilting pad bearing by introducing the squeeze film damper, when vibration is transmitted to the squeeze film damper through the tilting pad, high-viscosity lubricating oil is squeezed to reciprocate in the damper to consume energy, the damping performance of the bearing can be greatly improved, the cross rigidity of the bearing can be eliminated, the stability of a bearing-rotor system is improved, in addition, the closed squeeze film damper can effectively avoid the leakage of the hydraulic oil and the environmental pollution, and the structure is simple.
2. According to the invention, through the arrangement of the external air supply port, the air pressure in the porous air can be conveniently adjusted, and the adaptability is improved; in addition, the hydraulic oil throttling device can be used as a throttling device of hydraulic oil, the porosity is uniform, the permeability is consistent and isotropic, the high bearing capacity and the high stability are guaranteed, hydraulic oil can be conveniently replaced and added by combining the oil outlet of the damper, the sealing effect is greatly improved by the aid of the double sealing rings, and leakage of the hydraulic oil is prevented.
3. The invention is easy to fill glue by the height difference of the porous bulge mounting groove, and can reliably fix the porous material; the bearing capacity and stability can be further improved by limiting the number of the tiles and the number of the squeeze film dampers on the tiles.
Drawings
Fig. 1 is a perspective view of the overall structure of the present invention.
Fig. 2 is a front view of the overall structure of the present invention.
FIG. 3 is a schematic view of the tile structure of the present invention.
FIG. 4 is a schematic view of the squeeze film damper according to the present invention.
Fig. 5 is a sectional view taken along line a-a in fig. 4.
Reference numerals: 1. the damper comprises a shell, 2, tiles, 3, a squeeze film damper, 31, a mounting groove, 32, a damper plunger, 33, a damper oil outlet, 4, a porous body, 5, a porous air supply hole, 6 and an external air supply port.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of the present invention.
The invention provides a porous tilting pad bearing based on a closed squeeze film damper, which comprises a bearing base as shown in figures 1 to 3, wherein the bearing base comprises a shell 1 and a plurality of tiles 2, preferably 4 tiles, arranged in the shell 1, the 4 tiles 2 enclose an annular structure concentric with the shell 1, the intervals between the adjacent 2 tiles 2 are equal, a squeeze film damper 3 is arranged between the shell 1 and the tiles 2, preferably 2 squeeze film dampers 3 are arranged between each tile 2 and the shell 1, a cavity is formed in the squeeze film damper 3 and filled with hydraulic oil, the shell of the squeeze film damper 3 is of a compressible revolving body structure, when vibration is transmitted to the squeeze film damper 3 through the tilting tiles 2, the shell of the squeeze film damper 3 deforms under force, and the hydraulic oil in the cavity flows in the cavity under the action of squeezing, the tile 2 is provided with a mounting groove 31 on one side far away from the shell 1, a porous 4 is mounted in the mounting groove 31, the porous 4 is radially spaced from the bottom of the mounting groove 31 so that the spaced area forms an air cavity, the bottom of the mounting groove 31 is provided with a porous air supply hole 5 communicated with the air cavity, and the air cavity is used for providing a buffer area for air so that the air can uniformly pass through the porous 4 to enter a gap formed by the surface of the porous 4 and the shaft diameter. When external driving force is not provided for the rotor and only external gas source is provided, high-pressure gas permeates into the porous material 4 through the external gas inlet 6 and the porous gas supply holes 5, and finally forms a gas film in a bearing gap, the gas enters the gap and is extruded to cause pressure rise, so that the rotor is supported, the gas film is always present in the running process of the rotor, so that the rotor only contacts with the gas film from beginning to end, and the static pressure gas bearing is a bearing which has no friction basically and small loss due to small gas friction coefficient, and under the working condition, the bearing is equivalent to a pure static pressure gas bearing. When external high-pressure air pressure is not provided and only external driving force is provided for the rotor, the lubricating gas is brought into the wedge-shaped gap and forms a lubricating gas film to bear external load because the air flow has certain viscosity; in this case, the bearing corresponds to a purely hydrodynamic gas bearing. When an external air source and an external force for driving the rotor to rotate are provided at the same time, if the rotating speed is high, the dynamic pressure effect caused by the rotation of the rotor is not negligible, the performance of the bearing is determined by the coupling effect of the static pressure effect and the dynamic pressure effect, and the bearing can be regarded as a dynamic and static pressure mixed gas bearing. The operation state of the bearing-rotor system can be controlled by adjusting the magnitude of the external air supply pressure and the rotation speed of the shaft.
In the present embodiment, as shown in fig. 3, an external air supply port 6 is provided on an outer end surface of the tile 2 in the axial direction, the external air supply port 6 communicates with the porous air supply hole 5, and the external air supply port 6 is provided to facilitate the input of an external air source.
In this embodiment, as shown in fig. 4 and 5, a plurality of damper plungers 32 are installed inside the squeeze film damper 3, the damper plungers 32 are arranged in a cavity in a staggered manner, the damper plungers 32 may be made of graphite, the permeability of the damper plungers 32 in each direction is the same, the graphite plungers are prepared by a cold isostatic pressing process, and after mechanical processing, the pores are cleaned by ultrasonic waves, so that the pores are not blocked. The graphite plunger in the embodiment has all the characteristics of common graphite, and has the characteristics of uniform and compact material structure, high mechanical strength, uniform pore distribution, strong oxidation resistance, good machining performance and the like.
In this embodiment, as shown in fig. 2 and 5, a damper oil outlet 33 is formed in one end, close to the outer shell 1, of the squeeze film damper 3, the damper oil outlet 33 penetrates through the shell of the squeeze film damper 3, a through hole matched with the damper oil outlet 33 is formed in the outer shell 1, and the damper oil outlet 33 is installed in the through hole, so that hydraulic oil can be conveniently replaced and added; in addition, the double sealing rings are arranged between the shell of the squeeze film damper 3 and the oil outlet 33 of the damper, so that the sealing effect can be greatly improved, and the leakage of hydraulic oil is prevented.
In this embodiment, as shown in fig. 2, the side of the porous layer 4 away from the bottom of the mounting groove 31 is higher than the top surface of the mounting groove 31, and the porous layer 4 and the side surface of the mounting groove 31 are connected by filling adhesive, so that the adhesive can be easily filled by providing a height difference, and the porous layer 4 can be reliably fixed.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. Porous tilting pad bearing based on closed squeeze film damper, including bearing pedestal, bearing pedestal includes shell (1) and sets up a plurality of tiles (2) in shell (1), a plurality of tiles (2) enclose into the concentric annular structure with shell (1), install squeeze film damper (3) between shell (1) and tile (2), squeeze film damper (3) inside vacuole formation, the cavity intussuseption is filled with hydraulic oil, its characterized in that, the casing of squeeze film damper (3) is compressible structure, one side that shell (1) was kept away from to tile (2) is equipped with mounting groove (31), install porous (4) in mounting groove (31), porous (4) and mounting groove (31) bottom set up along radial interval, so that the interval region forms the air cavity, and a porous air supply hole (5) communicated with the air cavity is formed at the bottom of the mounting groove (31).
2. The porous tilting pad bearing based on closed squeeze film damper according to claim 1 wherein the tile (2) is provided with an external air supply port (6) on the outer end surface in the axial direction, the external air supply port (6) communicating with the porous air supply hole (5).
3. The closed squeeze film damper based porous tilting pad bearing according to claim 1, characterized in that a plurality of damper plungers (32) are installed inside the squeeze film damper (3), and the plurality of damper plungers (32) are staggered in the cavity.
4. The porous tilting pad bearing based on the closed squeeze film damper as claimed in any one of claims 1 to 3, wherein a damper oil outlet (33) is arranged at one end of the squeeze film damper (3) close to the housing (1), the damper oil outlet (33) penetrates through the housing of the squeeze film damper (3), a through hole matched with the damper oil outlet (33) is arranged on the housing (1), and the damper oil outlet (33) is installed in the through hole.
5. The closed squeeze film damper-based porous tilting pad bearing according to claim 4, characterized in that a double seal ring is installed between the housing of the squeeze film damper (3) and the damper oil outlet (33).
6. The porous tilting pad bearing based on the closed squeeze film damper according to claim 1, wherein the side of the porous (4) far away from the bottom of the mounting groove (31) is higher than the top surface of the mounting groove (31), and the porous (4) is connected with the side surface of the mounting groove (31) through filling glue.
7. The closed squeeze film damper based porous tilting pad bearing according to claim 1, characterized in that said tiles (2) are 4, and the spacing between adjacent 2 tiles (2) is equal.
8. The closed squeeze film damper-based porous tilting pad bearing according to claim 7, characterized in that 2 squeeze film dampers (3) are installed between any tile (2) and the housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011105567.7A CN112112897A (en) | 2020-10-15 | 2020-10-15 | Porous tilting pad bearing based on closed squeeze film damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011105567.7A CN112112897A (en) | 2020-10-15 | 2020-10-15 | Porous tilting pad bearing based on closed squeeze film damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112112897A true CN112112897A (en) | 2020-12-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011105567.7A Pending CN112112897A (en) | 2020-10-15 | 2020-10-15 | Porous tilting pad bearing based on closed squeeze film damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112112897A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992244A (en) * | 2022-07-07 | 2022-09-02 | 郑州大学 | Porous tilting pad static pressure gas thrust bearing with damper |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5790419A (en) * | 1980-11-21 | 1982-06-05 | Hitachi Seiko Ltd | Static pressure air bearing |
| CN104533955A (en) * | 2015-01-13 | 2015-04-22 | 江南大学 | Water lubrication tilting pad static-pressure bearing structure cooled through water returning grooves |
| CN105593542A (en) * | 2013-10-11 | 2016-05-18 | 通用电气公司 | Hermetically sealed damper assembly and methods of assembling same |
| CN106195007A (en) * | 2016-07-28 | 2016-12-07 | 重庆大学 | A kind of pneumatic air supporting rotary apparatus |
-
2020
- 2020-10-15 CN CN202011105567.7A patent/CN112112897A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5790419A (en) * | 1980-11-21 | 1982-06-05 | Hitachi Seiko Ltd | Static pressure air bearing |
| CN105593542A (en) * | 2013-10-11 | 2016-05-18 | 通用电气公司 | Hermetically sealed damper assembly and methods of assembling same |
| CN104533955A (en) * | 2015-01-13 | 2015-04-22 | 江南大学 | Water lubrication tilting pad static-pressure bearing structure cooled through water returning grooves |
| CN106195007A (en) * | 2016-07-28 | 2016-12-07 | 重庆大学 | A kind of pneumatic air supporting rotary apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 党根茂: "《气体润滑技术》", 30 June 1990, 东南大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992244A (en) * | 2022-07-07 | 2022-09-02 | 郑州大学 | Porous tilting pad static pressure gas thrust bearing with damper |
| CN114992244B (en) * | 2022-07-07 | 2023-06-02 | 郑州大学 | Porous tilting pad static pressure gas thrust bearing with damper |
| 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: 20201222 |