CN201535319U - Inner pion-shaped air wedge slot dynamic and static pressure composite air bearing - Google Patents
Inner pion-shaped air wedge slot dynamic and static pressure composite air bearing Download PDFInfo
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- CN201535319U CN201535319U CN2009203121021U CN200920312102U CN201535319U CN 201535319 U CN201535319 U CN 201535319U CN 2009203121021 U CN2009203121021 U CN 2009203121021U CN 200920312102 U CN200920312102 U CN 200920312102U CN 201535319 U CN201535319 U CN 201535319U
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- 210000003739 neck Anatomy 0.000 abstract 1
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- 238000005516 engineering process Methods 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model discloses an inner pion-shaped air wedge slot dynamic and static pressure composite air bearing, and relates to the bearing technique, in particular to an air bearing which is used for supporting super-high speed rotation machine and is provided with a novel structure form. The structure is characterized in that the inner surface of the bearing adopts pion-shaped air wedge slot design, dynamic and static pressure composite design and thrust surface dynamic and static pressure design, the thrust surface adopts spiral-shaped pressure boost groove designs, and the inner surface and the thrust surface are respectively provided with static pressure air supply holes. The air bearing of the utility model avoids defects such as coupling between static pressure and dynamic pressure and mutual interference, avoids the defect that the dynamic pressure effects on two ends of the bearing are not consistent, not only prominently improves the bearing ability and rotation speed of the bearing, but also greatly lowers the axial and transverse vibration of rotor shaft necks, and improves the stability and the reliability of the rotor system. Thereby the air bearing has simple structure, high bearing force, stable operation and high reliability, and further widens the application range of the air bearing.
Description
Technical field
The utility model belongs to technical field of bearings, relates to a kind of a kind of interior π shape gas wedge groove dynamic and static pressure composite air-bearing that supports high-speed rotating machine.
Background technique
Air-bearing is a high-tech product that develops rapidly mid-term in 20th century, and it is compared with traditional rolling bearing or oily sliding bearing, has high rotating speed, highi degree of accuracy, low power consumption, pollution-free, advantage such as the life-span is long, environmental suitability is strong.Therefore be widely used in industries such as national defence, the energy, lathe and medical treatment, especially obvious superiority more arranged at ultra high speed rotating machinery and ultraprecise Instrument technology field.
At present, air-bearing is lubricated to mainly contain two kinds of basic lubricating systems, and a kind of is static-pressure air bearing, as shown in Figure 1; Another kind is kinetic pressure air-float bearing of inner or active and static pressure mixed type air-bearing.Kinetic pressure air-float bearing of inner can be divided into dual mode, and the first is slotted on the rotor of air-bearing supporting, and it two is to slot on the air-bearing internal surface; Accompanying drawing 2 is sectional views of a kind of axial flow slot type kinetic pressure air-float bearing of inner, among the figure, and rotor journal 1, bearing support 2, the supercharging flow path groove 3 of rotor journal 1 outer round surface, elastic ring 4, supercharging flow path groove position man type; Patent application: π shape groove active and static pressure mixed type gas bearing, application number 94207681.8 is seen shown in Figure 3ly, its core is to offer π shape supercharging flow path groove on rotor journal.
No matter be static-pressure air bearing or kinetic pressure air-float bearing of inner, its principle all is to rely on gas lubrication, bearing is exactly a viscosity of utilizing gas, improve the gas pressure in the gap, thereby axle suspension is floated the bearing that comes (sees and [day] ten closes Jin Yizhu, Han Huanchen translates " pneumatic bearing---design, making and application ", Yuhang Publishing House, 1988).Axial flow slot type kinetic pressure air-float bearing of inner is to be processed into the air-flow conduit in journal surface, and the surface that relatively moves that dynamic and static gaps is wedge-like diminishes gradually along the movement direction gap, utilize the viscous effect of gas, make axle suspension float at the wedge-shaped surface traction generation pressure that relatively moves and (see [Soviet Union] B.H De Luozhidaoweiqi work, Zheng Lizhu translates, " kinetic pressure air-float bearing of inner ", National Defense Industry Press, 1982); The advantage of above-mentioned static pressure, kinetic pressure air-float bearing of inner is simple in structure, is convenient to safeguard, uses also very effective in many cases; But the bearing capacity of static-pressure air bearing is low, and the solid of rotation weight that is supported can not be too high; Above-mentioned two kinds of kinetic pressure air-float bearing of inner because the structural feature of slotting on the rotor journal, all exist the short time such as start-stop to surface of contact wear-resisting property requirement height, and the rough easier generation sound parts of journal surface bump and rub, wear and tear, and cause the fault of bearing.
Patent application: internal groove self-lubricating dynamic-static pressure coupling air-float bearing, application number: 200720177830.7, see Fig. 4 A, Fig. 4 B.Shown in, its main contents are as follows: it is made up of rotor journal 1, bearing support 2, supercharging flow path groove 3, damping elastomer circle 4, air vent 5, spray nozzle of the gas supply 6; Air vent 5 and spray nozzle of the gas supply 6 constitute static-pressure system, and the supercharging flow path groove is the dynamic pressure system.Mainly there are two problems in it: the one, and the spray nozzle of the gas supply 6 of static-pressure system is positioned at the supercharging flow path groove 3 of dynamic pressure system, when there is vibration in inhomogeneous or rotor when the static-pressure system air feed, the flow field that the air that spray nozzle of the gas supply 6 is come in forms produces disturbance, bearing two end supports rigidity is no longer equal, thereby can cause high-speed rotating machine vibration exceeding the standard or unstability; The 2nd, two supercharging flow path grooves at the bearing two ends of dynamic pressure system do not connect, under the situation that the rotor appearance is vibrated or the static pressure supply gas pressure does not wait, the dynamic pressure effect at bearing two ends is equity no longer, thereby has reduced the bearing capacity of air-bearing, has promptly reduced the reliability of high-speed rotating machine.
Patent application: the kinetic pressure air-float bearing of inner of flow passage self-lubricating structure, application number: 200720177829.4, see that its main contents are as follows shown in Fig. 5 A, Fig. 5 B: it is made up of rotor journal 1, bearing support 2, supercharging flow path groove 3, elastic ring 4; Mainly there are two problems in it: the one, owing to be pure kinetic pressure air-float bearing of inner, the start up period and low-speed stage (as below 20,000 rev/mins), the dynamic pressure effect of this air-bearing is relatively poor, axle journal can not effectively float, bearing lubrication is not smooth, causes the short time to be bumped rubbing and vibrates comparatively serious; The 2nd, two supercharging flow path grooves at bearing two ends do not connect, rotor occur vibration or part bump rub or external disturbance under, the dynamic pressure effect at bearing two ends is equity no longer, thereby has reduced the bearing capacity of kinetic pressure air-float bearing of inner, has promptly reduced the reliability of high-speed rotating machine.
The model utility content
The technical problems to be solved in the utility model is to propose a kind of interior π shape gas wedge groove dynamic and static pressure composite air-bearing, has overcome the deficiency of the existence of above-mentioned existing static-pressure air bearing, kinetic pressure air-float bearing of inner and dynamic-static pressure coupling air-float bearing.
π shape gas wedge groove dynamic and static pressure composite air-bearing in a kind of, described compound, one is meant that bearing is made of static-pressure system and dynamic pressure system, two are meant that bearing has radial and axial (thrust) bearing value simultaneously.
For achieving the above object, technical solution of the present utility model is:
Static-pressure system is to offer the static pressure air vent of perforation respectively at bearing thrust face and internal surface, comprises thrust surface static pressure inlet hole, the vertical nozzle of thrust surface static pressure, internal surface static pressure air vent and internal surface static pressure tangential nozzle; The vertical nozzle direction of thrust surface static pressure is vertical with thrust surface, and nozzle has two rows, and every row is centrosymmetric along the thrust surface center and evenly distributes; Internal surface static pressure tangential nozzle has a row, lays respectively between the internal surface dynamic pressure π shape gas wedge groove, and nozzle direction and bearing inner surface are tangential and intersect.
The dynamic pressure system comprises thrust surface dynamic pressure spiral chute and internal surface dynamic pressure π shape gas wedge groove; Thrust surface dynamic pressure spiral chute degree of depth unanimity, the top has wedge angle, evenly distributes at interval along thrust surface and thrust surface static pressure nozzle; Internal surface dynamic pressure π shape gas wedge groove, it is shaped as π shape, and groove width is even, and the gas angle of wedge is arranged, and along the degree of depth of sense of rotation groove from depth to shallow promptly, π shape gas wedge groove evenly distributes along the whole circle of internal surface, and spaced apart with internal surface static pressure nozzle.
Radial support is made of the static-pressure system and the dynamic pressure system of bearing inner surface, and thrust is made of static-pressure system on the bearing thrust face and dynamic pressure system.
The beneficial effects of the utility model are that bearing inner surface adopts the design of π shape gas wedge groove, active and static pressure mix design and the design of thrust surface active and static pressure, improved the low speed of bearing, the bearing capacity of high speed stage, the π shape gas wedge groove design of perforation has effectively improved stable, the reliability of supporting; Thrust surface can reduce the axial vibration that is supported axle journal greatly, has further widened the using scope of air-bearing.
Description of drawings
Fig. 1 is existing static-pressure air bearing structural representation.
Fig. 2 is existing axial flow slot type kinetic pressure air-float bearing of inner schematic representation.
Fig. 3 is existing π shape groove active and static pressure mixed type gas bearing structure schematic representation.
Fig. 4 A is existing internal groove self-lubricating dynamic-static pressure coupling air-float bearing structural representation.
Fig. 4 B is the air-bearing internal surface supercharging flow path groove structural representation of Fig. 4 A.
Fig. 5 A is the kinetic pressure air-float bearing of inner structural representation of existing flow passage self-lubricating structure.
Fig. 5 B is the air-bearing internal surface supercharging flow path groove structural representation of Fig. 5 A.
Fig. 6 is an interior π shape gas wedge groove dynamic and static pressure composite air-bearing cross sectional representation of the present utility model.
Fig. 7 is the thrust surface schematic representation of Fig. 6.
Fig. 8 is the longitudinal section schematic representation of Fig. 6.
Fig. 9 A, Fig. 9 B, Fig. 9 C are bearing inner surface π shape gas wedge groove shape and change in depth schematic representation.
Among the figure: 01 thrust surface static pressure air vent; 02 internal surface static pressure air vent; The vertical nozzle of 03 thrust surface static pressure; 04 internal surface static pressure tangential nozzle; 05 internal surface dynamic pressure π shape gas wedge groove; 06 thrust surface dynamic pressure spiral chute, 07 seal ring.
Embodiment
Be described in detail embodiment below in conjunction with technology and accompanying drawing.
As shown in the figure, interior π shape gas wedge groove dynamic and static pressure composite air-bearing of the present utility model is made up of thrust surface static pressure air vent 01, internal surface static pressure air vent 02, the vertical nozzle 03 of thrust surface static pressure, internal surface static pressure tangential nozzle 04, internal surface dynamic pressure π shape gas wedge groove 05, thrust surface dynamic pressure spiral chute 06, seal ring 07.Interior π shape gas wedge groove dynamic and static pressure composite air-bearing mainly provides support stiffness by static-pressure system and dynamic pressure system for rotor journal, wherein,
Static-pressure system comprises thrust surface static pressure inlet hole 01, the vertical nozzle 03 of thrust surface static pressure, internal surface static pressure air vent 02, internal surface static pressure tangential nozzle composition 04; Vertical nozzle 03 direction of thrust surface static pressure is vertical with thrust surface, and nozzle has two rows, and every row is centrosymmetric along the thrust surface center and evenly distributes; Internal surface static pressure tangential nozzle 04 has a row, lays respectively between the internal surface dynamic pressure π shape gas wedge groove 05, and nozzle direction and bearing inner surface are tangential and intersect.
The dynamic pressure system comprises thrust surface dynamic pressure spiral chute 06, internal surface dynamic pressure π shape gas wedge groove 05; Thrust surface dynamic pressure spiral chute 06 degree of depth unanimity, the top has wedge angle, evenly distributes at interval along thrust surface and thrust surface static pressure nozzle; Internal surface dynamic pressure π shape gas wedge groove 05 is shaped as π shape, and groove width is even, and the gas angle of wedge is arranged, along the degree of depth of sense of rotation groove from depth to shallow promptly.π shape groove evenly distributes at interval along internal surface and with internal surface static pressure nozzle.
Simultaneously, see also Fig. 7 A, Fig. 7 B and Fig. 7 C, core technology of the present utility model is to adopt the design of π shape gas wedge groove, active and static pressure mix design and the design of thrust surface active and static pressure.Its principle is according to air-bearing and the structural feature that is supported rotor journal sound parts, at first utilize static-pressure system that rotor journal is suspended at bearing inner surface and thrust surface, and provide support stiffness and damping for the rotation in certain speed range of rotor journal; After the rotating speed of rotor journal increases to a certain degree, the dynamic pressure system begins to bring into play bigger support stiffness, be that air in thrust surface dynamic pressure spiral chute 06, the internal surface dynamic pressure π shape gas wedge groove 05 is driven by the rotor journal of high speed rotating, form the effect of gas boosting.Seal ring 07 can also reduce air-bearing and rub and wear and tear being supported bumping of rotor startup stage except the function with seals high pressure gas.
This dynamic pressure of air-bearing, static pressure composite design can provide by the support stiffness of low speed in the high speed rotating process for rotor journal, have avoided coupling and interference effect mutually between static pressure and the dynamic pressure; The π shape gas wedge groove design that connects can be avoided " eight " font or the inconsistent serious drawback of " people " font supercharging flow path groove (or being the dynamic pressure groove) two ends dynamic pressure effect, the design that connects makes bearing two ends pressurized effect or support stiffness unanimity, makes the rotor journal operation more stable, reliable.The design of thrust surface active and static pressure can make rotor journal be suspended between the two bearings, play the effect of thrust bearing, greatly reduced the axial vibration of rotor journal, simultaneously also has the good restraining effect for radial vibration, therefore, significantly improve the stability of rotor journal operation, widened the using scope of air-bearing.
Claims (1)
1. π shape gas wedge groove dynamic and static pressure composite air-bearing in a kind comprises thrust surface static pressure air vent (01), internal surface static pressure air vent (02), the vertical nozzle of thrust surface static pressure (03), internal surface static pressure tangential nozzle (04), internal surface dynamic pressure π shape gas wedge groove (05), thrust surface dynamic pressure spiral chute (06) and seal ring (07); It is characterized in that: comprise static-pressure system and dynamic pressure system, wherein,
Static-pressure system is to offer the static pressure air vent of perforation respectively at bearing thrust face and internal surface, and the vertical nozzle of thrust surface static pressure (03) direction is vertical with thrust surface, and nozzle has two rows, and every row is centrosymmetric along the thrust surface center and evenly distributes; Internal surface static pressure tangential nozzle (04) has a row, lays respectively between the internal surface dynamic pressure π shape gas wedge groove (05), and nozzle direction and bearing inner surface are tangential and intersect;
The dynamic pressure system offers dynamic pressure spiral chute (06), internal surface dynamic pressure π shape gas wedge groove (05) respectively at bearing thrust face and internal surface; Thrust surface dynamic pressure spiral chute (06) degree of depth unanimity, the top has wedge angle, evenly distributes at interval along thrust surface and thrust surface static pressure nozzle; Internal surface dynamic pressure π shape gas wedge groove (05);
Groove be shaped as π shape, groove width is even, and the gas angle of wedge is arranged, along the degree of depth of sense of rotation groove from depth to shallow promptly; π shape gas wedge groove (05) evenly distributes along the whole circle of internal surface, and spaced apart with internal surface static pressure nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203121021U CN201535319U (en) | 2009-10-09 | 2009-10-09 | Inner pion-shaped air wedge slot dynamic and static pressure composite air bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203121021U CN201535319U (en) | 2009-10-09 | 2009-10-09 | Inner pion-shaped air wedge slot dynamic and static pressure composite air bearing |
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| CN201535319U true CN201535319U (en) | 2010-07-28 |
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| CN2009203121021U Expired - Lifetime CN201535319U (en) | 2009-10-09 | 2009-10-09 | Inner pion-shaped air wedge slot dynamic and static pressure composite air bearing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106195007A (en) * | 2016-07-28 | 2016-12-07 | 重庆大学 | A kind of pneumatic air supporting rotary apparatus |
| CN109826866A (en) * | 2019-01-21 | 2019-05-31 | 南京航空航天大学 | A kind of two-way spiral groove protection bearing arrangement |
| CN110242672A (en) * | 2018-03-09 | 2019-09-17 | 三菱重工业株式会社 | Split sleeve bearing, rotating machinery |
-
2009
- 2009-10-09 CN CN2009203121021U patent/CN201535319U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106195007A (en) * | 2016-07-28 | 2016-12-07 | 重庆大学 | A kind of pneumatic air supporting rotary apparatus |
| CN106195007B (en) * | 2016-07-28 | 2019-03-19 | 重庆大学 | A kind of pneumatic air bearing rotating device |
| CN110242672A (en) * | 2018-03-09 | 2019-09-17 | 三菱重工业株式会社 | Split sleeve bearing, rotating machinery |
| CN109826866A (en) * | 2019-01-21 | 2019-05-31 | 南京航空航天大学 | A kind of two-way spiral groove protection bearing arrangement |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100728 Effective date of abandoning: 20110202 |