CN106545576B - Fluid-solid coupling type gas shock wave adjusting bearing - Google Patents
Fluid-solid coupling type gas shock wave adjusting bearing Download PDFInfo
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- CN106545576B CN106545576B CN201710034627.2A CN201710034627A CN106545576B CN 106545576 B CN106545576 B CN 106545576B CN 201710034627 A CN201710034627 A CN 201710034627A CN 106545576 B CN106545576 B CN 106545576B
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- bearing
- foil
- fluid
- shock wave
- air feed
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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
Abstract
The invention relates to a fluid-solid coupling type gas shock wave adjusting bearing. The current widely used dynamic foil bearing has limited bearing capacity, insufficient stability and high technological requirement of foil surface coating, and the static pressure-dynamic pressure mixed bearing has the problems of insufficient bearing at low rotating speed and unstable pneumatic at high rotating speed. The invention comprises the following components: axle bush (1), air feed orifice (3) have been seted up on the axle bush, air feed orifice exit position damping chamber (4) have, the air feed orifice the structure in damping chamber evenly arrange one row or multirow along circumference at the axle bush internal surface, damping chamber export and rotor (2) in the middle of arrange foil structure (7), foil structure include ripples foil (6), flat foil (5), through changing bearing air feed pressure, orifice structure and damping chamber structure, can with the bearing operating mode phase-match of big clearance heavy load. The invention is used for the fluid-solid coupling type gas shock wave adjusting bearing.
Description
The technical field is as follows:
the invention relates to a gas bearing, in particular to a fluid-solid coupling type gas shock wave adjusting bearing.
Background art:
the gas bearing adopts the gas with the characteristics of low viscosity, small temperature change, cleanness, no pollution, radiation resistance, good compressibility and the like as a lubricating medium, has the advantages of low power consumption, long service life, high precision and the like, but inhibits the application of the bearing in the heavy-load field due to the characteristics of low viscosity, compressibility and the like of the gas.
For example, the main problems of the foil bearing are that the bearing capacity is limited, especially the stability is insufficient in the start-stop process and under external disturbance, the requirement of the foil surface coating process is high, the foil structure is complex, for the static pressure-dynamic pressure hybrid bearing, when the gas supply pressure of the bearing is continuously increased, the gas flows into the bearing gap at the throttling port and is congested, complicated flow field characteristics such as subsonic flow, supersonic flow and even shock wave occur in the bearing gap, pressure loss is caused in the supersonic region, and the bearing capacity and stability of the bearing are reduced, that is, the problems of insufficient bearing at low rotating speed and unstable pneumatic at high rotating speed exist.
The invention content is as follows:
the invention aims to provide a fluid-solid coupling type gas shock wave adjusting bearing.
The above purpose is realized by the following technical scheme:
a fluid-solid coupling type gas shock wave adjusting bearing comprises: the bearing bush has been seted up the air feed orifice on the bearing bush, air feed orifice exit position damping chamber has, the air feed orifice the structure in damping chamber evenly arrange one row or multirow along circumference at the bearing bush internal surface, damping chamber export and rotor in the middle of arrange the foil structure, the foil structure include ripples foil, flat foil, through changing bearing air feed pressure, orifice structure and damping chamber structure, can with the bearing operating mode phase-match of big clearance heavy load.
The fluid-solid coupling type gas shock wave adjusting bearing is characterized in that a gas supply throttling hole nozzle adopts a zooming Laval nozzle structure form, a damping cavity adopts an inwards concave variable cross-section cavity structure, and the gas supply throttling hole directly faces to a groove of a wave foil.
The fluid-solid coupling type gas shock wave adjusting bearing is characterized in that a foil structure is arranged between the outlet of the damping cavity and the rotor, the foil structure comprises a wave foil and a flat foil, the flat foil is arranged between the outlet of the damping cavity and the rotor, and the gas supply throttling hole directly faces the flat foil.
Has the advantages that:
1. the fluid-solid coupling type gas shock wave adjusting bearing is suitable for high-speed heavy-load application, adopts the air inlet throttling hole with the scaling structure and the variable cross-section damping cavity structure on the inner surface of the bearing, can improve the bearing capacity of the existing gas bearing, can improve the pneumatic stability of the bearing, and further widens the application range of the gas bearing.
According to the structural characteristics of the gas bearing and the bearing bush journal dynamic and static parts, the fluid-solid coupling flow characteristics of a lubricant (gas) and the bearing and a rotor (solid) are utilized, the fluid-solid coupling flow characteristics of the internal flow of the gas bearing and the fluid-solid coupling flow characteristics between the bearing and the rotor are improved through the structural forms of the convergent-divergent type throttling hole and the bearing bush damping cavity, the bearing capacity and the stability are improved, one or more rows of throttling gas supply holes are formed in the bearing body, and the convergent-divergent type nozzle throttling gas supply structure is adopted, so that the static pressure bearing and damping effects are provided for the floating of the rotor.
The invention adopts the zoom type nozzle throttling hole, when the airflow at the throttling hole inlet is subsonic, the change of the gas flow speed in the throttling hole flow channel is subsonic-sonic-subsonic, the gas flow speed reaches sonic speed at the throat position, no supersonic flow nor shock wave occurs in the whole process, when the bearing load is larger and the bearing air supply pressure is higher, the airflow at the throttling hole inlet reaches supersonic speed, the change of the gas flow speed in the throttling hole flow channel is supersonic speed-sonic-subsonic, the design point shock wave position is at the throat, the gas pressure is improved after shock wave, the speed is reduced to subsonic speed, and the bearing is improved, thereby ensuring that the complicated flowing conditions of supersonic flow, even shock wave and the like do not occur at the throttling hole outlet position.
According to the invention, the variable cross-section damping cavity structure is arranged at the orifice outlet position on the inner surface of the bearing bush, when shock waves are generated in a bearing bush-rotor gap due to the situations that gas flow in the orifice is not at a design point, the gas supply pressure at the bearing inlet is too high, the outlet pressure is reduced or fluctuated and the like, the damping cavity can adjust the position and the strength of the shock waves, the purpose is to control the sizes of the front and rear areas of the shock waves, and the bearing and the stability of the bearing are automatically adjusted by adjusting the sizes of the high and low pressure areas, so that the bearing and the stability of the bearing are improved, and the pneumatic stability under the conditions of high pressure and high flow.
The whole damping cavity structure adopts the variable cross section, and a shock wave system consisting of a series of normal shock waves and oblique shock waves is generated through the variable cross section, so that the total pressure recovery coefficient can be effectively improved, the energy dissipation after the shock waves is reduced, and the flow characteristic is better than that of the pure normal shock waves.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view of the axial structure of the bearing of the present invention.
FIG. 3 is a schematic view of a circumferentially developed bearing configuration of the present invention.
Fig. 4 is a schematic structural diagram of the fluid-solid coupling type gas shock wave adjusting sliding bearing of the invention.
FIG. 5 is a schematic structural diagram of a fluid-solid coupled gas shock wave regulating foil bearing (corrugated foil) according to the present invention.
FIG. 6 is a schematic structural diagram of a fluid-solid coupled gas shock wave adjusting foil bearing (wave-free foil) according to the present invention.
The specific implementation mode is as follows:
example 1:
a fluid-solid coupling type gas shock wave adjusting bearing comprises: bearing bush 1 has seted up air feed orifice 3 on the bearing bush, air feed orifice exit position damping chamber 4 has, the air feed orifice the structure in damping chamber evenly arrange one row or multirow along circumference at the bearing bush internal surface, damping chamber export and 2 middle foil structure 7 of arranging of rotor, the foil structure include ripples foil 6, flat foil 5, through changing bearing air feed pressure, orifice structure and damping chamber structure, can with the bearing operating mode phase-match of big clearance heavy load.
Example 2:
according to the fluid-solid coupling type gas shock wave adjusting bearing in the embodiment 1, the gas supply throttling hole nozzle adopts a zooming Laval nozzle structure, the damping cavity adopts a concave variable cross-section cavity structure, and the gas supply throttling hole directly faces to the groove of the wave foil.
Example 3:
according to the fluid-solid coupling type gas shock wave adjusting bearing in embodiment 1, a foil structure is arranged between an outlet of the damping cavity and the rotor, the foil structure comprises a corrugated foil and a flat foil, the flat foil is arranged between the outlet of the damping cavity and the rotor, and the gas supply throttling hole directly faces the flat foil.
Claims (2)
1. A fluid-solid coupling type gas shock wave adjusting bearing comprises: the bearing bush is characterized in that: the bearing bush is provided with an air supply throttling hole, a damping cavity is arranged at the outlet of the air supply throttling hole, the air supply throttling hole and the damping cavity are uniformly arranged in a row or multiple rows along the circumferential direction on the inner surface of the bearing bush, a foil structure is arranged between the outlet of the damping cavity and the rotor, the foil structure comprises a corrugated foil and a flat foil, and the bearing can be matched with the working condition of a large-gap large-load bearing by changing the air supply pressure of the bearing, the throttling hole structure and the damping cavity structure;
the air feed orifice nozzle for zoom type nozzle orifice, adopt the Laval spray tube structural style of zoom type, the damping chamber adopt the variable cross section cavity structure of indent, the nozzle of air feed orifice for zoom type nozzle, the export is the variable cross section cavity structure of indent, the air feed orifice direct subtend the groove of bump foil piece department.
2. The fluid-solid coupled gas shock wave adjusting bearing of claim 1, wherein: and a foil structure is arranged between the outlet of the damping cavity and the rotor, the foil structure comprises a corrugated foil and a flat foil, the flat foil is arranged between the outlet of the damping cavity and the rotor, and the air supply throttling hole directly faces the flat foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034627.2A CN106545576B (en) | 2017-01-18 | 2017-01-18 | Fluid-solid coupling type gas shock wave adjusting bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034627.2A CN106545576B (en) | 2017-01-18 | 2017-01-18 | Fluid-solid coupling type gas shock wave adjusting bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106545576A CN106545576A (en) | 2017-03-29 |
| CN106545576B true CN106545576B (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710034627.2A Active CN106545576B (en) | 2017-01-18 | 2017-01-18 | Fluid-solid coupling type gas shock wave adjusting bearing |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107504066B (en) * | 2017-08-14 | 2019-05-17 | 武汉科技大学 | A kind of integral shaft symmetrical jet pressure stabilizing cavity supplied to high pressure disk gas bearing |
Citations (8)
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| JPH0147649B2 (en) * | 1982-11-17 | 1989-10-16 | Aisin Seiki | |
| CN101749322A (en) * | 2008-12-05 | 2010-06-23 | 通用电气公司 | Self-adapting mixed gas radial journal bearing using integral silk net damper |
| CN103438091A (en) * | 2013-08-02 | 2013-12-11 | 湖南大学 | Aero dynamic bearing with metal rubber and elastic chaff composite support structure |
| CN103453017A (en) * | 2013-05-08 | 2013-12-18 | 哈尔滨耦合动力工程技术中心有限公司 | Dynamic and static pressure air floating bearing with zooming structure molded line |
| CN103591127A (en) * | 2013-10-24 | 2014-02-19 | 西安交通大学 | Dynamic pressure transverse bearing with variable dip angle slotting chaff |
| CN104632871A (en) * | 2015-03-17 | 2015-05-20 | 湖南大学 | Minitype foil aerodynamic pressure bearing |
| CN205388095U (en) * | 2016-03-04 | 2016-07-20 | 至玥腾风科技投资有限公司 | Electromagnetism makes active dynamic pressure gas bearing of ability |
| WO2016114418A1 (en) * | 2015-01-13 | 2016-07-21 | 주식회사 부강테크 | Air foil bearing having sensing device using piezoelectric element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH368346A (en) * | 1959-06-26 | 1963-03-31 | Escher Wyss Ag | Device for supplying the carrier gas to the bearing gap of an aerostatic bearing |
| SU1712692A2 (en) * | 1990-03-30 | 1992-02-15 | Московский авиационный технологический институт им.К.Э.Циолковского | Hydrostatic bearing |
| US8029194B2 (en) * | 2007-06-18 | 2011-10-04 | R&D Dynamics Corporation | Restrained, reverse multi-pad bearing assembly |
| WO2009124582A1 (en) * | 2008-04-07 | 2009-10-15 | Abb Research Ltd | Gas-insulated high voltage switch |
| JP2009287654A (en) * | 2008-05-28 | 2009-12-10 | Shimadzu Corp | Dynamic-pressure gas foil bearing |
| CN105498270B (en) * | 2016-01-15 | 2018-01-19 | 南京北大工道创新有限公司 | A kind of supersonic speed high pressure throttling condensing unit |
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2017
- 2017-01-18 CN CN201710034627.2A patent/CN106545576B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0147649B2 (en) * | 1982-11-17 | 1989-10-16 | Aisin Seiki | |
| CN101749322A (en) * | 2008-12-05 | 2010-06-23 | 通用电气公司 | Self-adapting mixed gas radial journal bearing using integral silk net damper |
| CN103453017A (en) * | 2013-05-08 | 2013-12-18 | 哈尔滨耦合动力工程技术中心有限公司 | Dynamic and static pressure air floating bearing with zooming structure molded line |
| CN103438091A (en) * | 2013-08-02 | 2013-12-11 | 湖南大学 | Aero dynamic bearing with metal rubber and elastic chaff composite support structure |
| CN103591127A (en) * | 2013-10-24 | 2014-02-19 | 西安交通大学 | Dynamic pressure transverse bearing with variable dip angle slotting chaff |
| WO2016114418A1 (en) * | 2015-01-13 | 2016-07-21 | 주식회사 부강테크 | Air foil bearing having sensing device using piezoelectric element |
| CN104632871A (en) * | 2015-03-17 | 2015-05-20 | 湖南大学 | Minitype foil aerodynamic pressure bearing |
| CN205388095U (en) * | 2016-03-04 | 2016-07-20 | 至玥腾风科技投资有限公司 | Electromagnetism makes active dynamic pressure gas bearing of ability |
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| CN106545576A (en) | 2017-03-29 |
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Address after: 150000 No. 92, West Da Zhi street, Nangang District, Harbin, Heilongjiang. Patentee after: HARBIN INSTITUTE OF TECHNOLOGY Patentee after: Nanjing Coupling Power Engineering Technology Co.,Ltd. Address before: 150001 No. 92 West straight street, Nangang District, Heilongjiang, Harbin Patentee before: HARBIN INSTITUTE OF TECHNOLOGY Patentee before: Harbin Coupled Power Engineering Technology Centre Co.,Ltd. |