CN102434580B - Elastic support device for foil dynamic bearing and manufacturing method thereof - Google Patents
Elastic support device for foil dynamic bearing and manufacturing method thereof Download PDFInfo
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- CN102434580B CN102434580B CN2011103441750A CN201110344175A CN102434580B CN 102434580 B CN102434580 B CN 102434580B CN 2011103441750 A CN2011103441750 A CN 2011103441750A CN 201110344175 A CN201110344175 A CN 201110344175A CN 102434580 B CN102434580 B CN 102434580B
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Abstract
The invention discloses an elastic support device for a foil dynamic bearing. The elastic support device comprises a bearing elastic support consisting of a bearing elastic support body and a first key, wherein the first key is arranged at one end of the bearing elastic support body; an angle of 70-100 degrees is formed between the first key and the bearing elastic support body; and the inner and outer surfaces of the bearing elastic support body are provided with a plurality of bumps. The elastic support device has the characteristics of convenience for manufacturing, simple structure, economic efficiency, rationality, adjustable rigidity and relatively strong bearing force, and can be widely applied to the foil dynamic bearing of high-speed turbo-machinery. The invention further discloses a method for manufacturing the elastic support device for the foil dynamic bearing.
Description
Technical field
The present invention relates to the foil dynamical pressure bearing of high rate turbine machinery, particularly relate to a kind of foil dynamical pressure bearing resilient supporting unit and preparation method thereof.
Background technique
Foil bearing is to use fluid to make oiling agent and adopt a kind of hydraulic bearing of paillon foil as elastic supporting element.The U.S. is since late 1960s, successfully be applied on the core coolant parts air cycle machine (ACM) of DC-10 plane environmental control system, because it has without oil, high efficiency, non-maintaining, anti shock and vibration, the advantage such as contamination resistance is strong, reliability is high, the life-span is long, on nearly all aircarrier aircraft afterwards, the air cycle machine that all adopts foil bearing to support.
Foil bearing is divided into blade profile foil bearing and the large class of wave mode foil bearing two, generally top foil and foil dynamical pressure bearing elastic support, consists of.Top foil forms by tinsel is curling, and generally compacting forms foil dynamical pressure bearing elastic support through mould by tinsel.During stationary rotor, top foil and axle fit tightly, and produce the dynamic pressure air film during rotor high-speed rotation and push top foil open, and axle suspension is floated on air film.Foil dynamical pressure bearing elastic support Main Function is to optimize air film to distribute, and strengthens bearing load carrying capacity; Simultaneously, foil dynamical pressure bearing elastic support can strengthen the structural damping of bearing, effectively strengthens the product shock resistance.
The raising of foil bearing bearing capacity is mainly the improvement to foil dynamical pressure bearing elastic support.Structural feature and bearing capacity according to foil dynamical pressure bearing elastic support, be divided into the three generations to foil bearing.First generation foil bearing is early production, and without foil dynamical pressure bearing elastic support or foil dynamical pressure bearing elastic support rigidity homogeneous, the foil bearing bearing capacity is very low; The characteristics of second generation foil bearing are that elastic support rigidity changes in a direction (axial or circumferential), effectively improve the air film structure, have reduced the air leakage of this direction end, and the foil bearing bearing capacity improves a lot; Third generation foil bearing comprises the paillon foil through meticulous cutting of a greater number, foil dynamical pressure bearing elastic support rigidity changes at both direction (axial and circumferential), the air film structure all is optimized at both direction, farthest reduce the air leakage of end, further increased the foil bearing bearing capacity.
although foil bearing has advantages of numerous, but because theoretical research seriously lags behind, cause preparation process very complicated, especially foil dynamical pressure bearing elastic support design and produce more complicated, its design criterion, size is determined, material selection, heat treatment and surface treatment etc. all need expend extensive work, not only develop difficulty very large, and exploitation drops into huge, technological level requires high, only have at present a few company to grasp its designing and manufacturing method, its design criterion and preparation process also are in strict restricted area, application also mainly is confined to the minority fields such as Aero-Space.
In recent years, some countries start to develop and have the foil bearing of characteristic separately, the domestic foil bearing elastic support structure that much has independent intellectual property right that also occurs.
publication number is CN1563732A, denomination of invention is CN2363119Y for application for a patent for invention and the publication number of " mechanical bearing flat foil type thrust gas bearing of high speed surbine ", denomination of invention discloses a kind of elastic support structure that adopts sheet rubber to replace tinsel for the utility model patent of " dynamic pressure radial bearing for elastic support foil piece ", this bearing structure is simple, make easy to process, but poor as the elastic sheet rubber temperature tolerance that supports, the bearing elastic support easily lost efficacy because of overheated causing, can't regulate because of rigidity simultaneously, bearing load carrying capacity is lower, can't realize industrial applications.
Publication number is that patent CN101280801A, denomination of invention disclose a kind of elastic support structure with bubbling for the application for a patent for invention of " a kind of kinetic pressure gas bearing structure with radial support foil slice ", this structure has overcome the poor shortcoming of elastic sheet rubber temperature tolerance, but its bubble structure need to adopt specialized mould to be stamped to form, and the rigidity homogeneous, bearing capacity is lower.
Summary of the invention
The objective of the invention is provides a kind of foil dynamical pressure bearing resilient supporting unit and preparation method thereof in order to overcome the deficiency of above-mentioned background technology, makes it have easy to make, simple in structure, economical rationality, rigidity is adjustable, bearing capacity is higher characteristics.
A kind of foil dynamical pressure bearing resilient supporting unit provided by the invention, comprise the bearing elastic support that is formed by bearing elastic support body and first key, described first key is arranged at an end of bearing elastic support body, first key and bearing elastic support body are 70 °～100 °, and on described bearing elastic support body, inner and outer surface is provided with many projections.
In technique scheme, described bearing elastic support body is provided with many bearing grooves, described bearing groove and protruding intercross arrangement.
In technique scheme, the bulge clearance of described bearing elastic support body inner and outer surface is arranged.
In technique scheme, the unfolded drawing of described bearing elastic support is rectangular or eccentric circular ring.
In technique scheme, described bearing groove has many rows, and the spacing of arranging between the bearing groove is reduced by bearing groove center gradually.
In technique scheme, the spacing between described many projections is identical.
In technique scheme, the spacing between described many projections is reduced to the other end gradually by first key.
In technique scheme, the projection thickness of these both sides, inside and outside of described bearing elastic support is not identical.
A kind of method of making foil dynamical pressure bearing resilient supporting unit, A, coating on bearing elastic support body the place that needs to reserve projection can etch-proof coating; B, the bearing elastic support body that will coat coating are put into chemical corrosion liquid or electrochemical corrosive liquid; The thickness of the projection that C, the time setting of by control, corroding need to form, corrode rear taking-up bearing elastic support body; D, the part that will be corroded are removed from bearing elastic support body; E, with coating removal.
In technique scheme, cut out out the bearing groove by the method for stamping-out or line cutting on bearing elastic support body before giving bearing elastic support body coated.
foil dynamical pressure bearing resilient supporting unit of the present invention and preparation method thereof, has following beneficial effect: adopt the on-mechanical processing methods such as chemical corrosion or electrochemical corrosion to make due to the bearing elastic support, so need not mould, both easy to make, reduced again the duration and cost that a large amount of mould development machinings need, and the projection that is processed into not only makes the bearing elastic support keep elasticity preferably, and make the tinsel material as foil dynamical pressure bearing resilient supporting unit also not be subjected to the restriction of metal material mechanics performance, widened timber range, improved work efficiency.
Selection by material, corrosion depth and groove width, and by the method for stamping-out or line cutting, cut out, make the bearing elastic support that is processed into the bearing groove, this bearing elastic support is not only simple in structure, and realized the variation of bearing elastic support rigidity on all directions, and the reasonable layout by rigidity, make the optimization of bearing air film, greatly improved bearing capacity.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1 wave mode bearing;
Fig. 2 is the unfolded drawing of bearing elastic support radially in the embodiment of the present invention 1;
Fig. 3 is the structural representation of the embodiment of the present invention 2 blade profile bearings;
Fig. 4 is the expansion plan view of bearing elastic support radially in the embodiment of the present invention 2;
Fig. 5 is the expansion plan view of bearing elastic support radially in the embodiment of the present invention 2;
Fig. 6 is the structural representation of thrust bearing elastic support of the present invention;
Fig. 7 is foil bearing of the present invention gas film pressure distribution schematic diagram vertically.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples, but this embodiment should not be construed as limitation of the present invention.
Figure 1 shows that wave mode bearing structure schematic diagram, the wave mode bearing comprises bearing housing 1, bearing elastic support 2, top foil 3 and the axle 4 that arranges from outside to inside successively.Axle 4 is suspended in High Rotation Speed on air film, and top foil 3, due to the effect of bearing elastic support 2, fits tightly with axle 4 when axle 4 is static, after axle 4 reaches certain rotating speed, the air film dynamic pressure that produces overcomes the elastic force of bearing elastic support 2, pushes top foil 3 open, and axle 4 is suspended on air film.In order to strengthen the damping of wave mode bearing, top foil 3 can adopt multilayer, be generally 1 layer to 3 layers, winding direction can be in the same way, can be also reverse, the number of plies is more, damping and amortization is stronger, but bearing capacity can reduce, and oppositely damping and amortization is better than in the same way, but the fabrication and installation required precision is higher, needs trade-off.
Referring to Fig. 2 and Fig. 6, the foil dynamical pressure bearing resilient supporting unit in wave mode bearing of the present invention comprises bearing elastic support 2.Described bearing elastic support 2 is comprised of bearing elastic support body 2.4 and first key 2.3, one end of bearing elastic support body 2.4 is provided with first key 2.3, first key 2.3 is 70 °～100 ° with bearing elastic support body 2.4, in the present embodiment, first key 2.3 is 90 ° with bearing elastic support body 2.4.Bearing elastic support body 2.4 inner and outer surface are provided with many projections 2.1, and the spacing between described many projections 2.1 is identical, and projection 2.1 intervals of described bearing elastic support body 2.4 inner and outer surface are arranged.Bearing elastic support body 2.4 is provided with many bearing grooves 2.2, described bearing groove 2.2 and protruding 2.1 intercross arrangement.described bearing groove 2.2 has many rows, spacing between many row's bearing grooves 2.2 is reduced laterally gradually by bearing groove 2.2 centers, this arrangement can make rigidity be reduced gradually by middle mind-set two ends vertically, so just reduced the foil bearing possibility of two ends air leakage vertically, simultaneously by material choose and projection 2.1 is highly the definite of corrosion depth, jointly determined the axial distribution of bearing elastic support 2 rigidity, in the present embodiment, bearing groove 2.2 numbers are even number, be generally 2 to 6, determine the quantity of bearing groove 2.2 cuttings according to the size of bearing elastic support 2 sizes, in most preferred embodiment, bearing groove 2.2 has four, radial bearing elastic support 2 is divided into 5 parts in cross section vertically, spacing width between described bearing groove 2.2 comprises 3 quantity laterally altogether by center, be b1, b2, b3, pass through b1, b2 and b3 choose the axial distribution that can determine bearing elastic support body 2.4 rigidity, b1＞b2＞b3 wherein.Fig. 7 has shown that fully the arrangement of this spacing makes distribution situation and the effect of pressure on bearing elastic support 2, the curve I is the pressure distribution that bearing elastic support 2 is not passed through cutting, the curve II is the pressure distribution of bearing elastic support 2 after cutting, the curve II shows, bearing elastic support 2 bearing capacity after cutting obviously increases.Bearing elastic support 2 comprises radial bearing elastic support and thrust bearing elastic support.Figure 2 shows that the unfolded drawing of radial bearing elastic support, Figure 6 shows that the unfolded drawing of thrust bearing elastic support, the unfolded drawing of radial bearing elastic support is rectangular, and the unfolded drawing of thrust bearing elastic support is eccentric circular ring.
The making method of foil dynamical pressure bearing resilient supporting unit of the present invention is as follows:
A, by the method for stamping-out or line cutting, cut out out bearing groove 2.2 on bearing elastic support body 2.4.
B, coating on radial bearing elastic support body 2.4 place that needs to reserve projection 2.1 can etch-proof coating (not shown);
C, the bearing elastic support body 2.4 that will coat coating are put into chemical corrosion liquid (not shown) or electrochemical corrosive liquid (not shown);
The thickness of the projection 2.1 that D, the time setting of by control, corroding need to form, corrode rear taking-up bearing elastic support body 2.4;
E, the part that will be corroded are removed from bearing elastic support body 2.4;
F, with coating removal.
The present embodiment and substantially the same manner as Example 1, difference is: Figure 3 shows that blade profile bearing structure schematic diagram, radial bearing elastic support in described blade profile bearing is joined and is formed by multi-disc blade profile radial bearing Flexible element 5 both sides, size according to the blade profile bearing, generally choose 4 to 12, the benefit of doing like this is to be easier to assembling with respect to monolithic, and in the present embodiment, the radial bearing elastic support is comprised of 5 blade profile radial bearing Flexible elements 5.
Referring to Fig. 4 to Fig. 5, spacing between projection 2.1 on blade profile radial bearing Flexible element 5, reduced gradually to deviating from the other end by first key 2.3, in the present embodiment, the projection 2.1 on blade profile radial bearing Flexible element 5 has 5, and the spacing between projection 2.1 comprises a1, a2, a3 and a4, wherein a1 is near a side of first key 2.3, a4 is positioned at a side that deviates from first key 2.3, and a2 and a3 are positioned between the two successively, a1＞a2＞a3＞a4.In the same thickness situation, spacing is larger, rigidity is less, and it is more reasonable that between this protruding 2.1, the layout of the circumferential variation of spacing makes the circumferential Stiffness Distribution of blade profile radial bearing Flexible element 5, has obviously improved the bearing capacity of blade profile radial bearing Flexible element 5.In the present embodiment, blade profile radial bearing Flexible element 5 is provided with two bearing grooves 2.2, bearing groove 2.2 is divided into 3 parts in cross section vertically with blade profile radial bearing Flexible element 5, spacing width between described radial bearing groove 2.2 comprises 2 quantity laterally altogether by center, be b1, b2, can determine the axial distribution of blade profile radial bearing Flexible element 5 rigidity by choosing of b1 and b2, wherein b1＞b2.Fig. 7 has shown that fully the arrangement of this spacing makes distribution situation and the effect of pressure on bearing elastic support 2, the curve I is the pressure distribution that bearing elastic support 2 is not passed through cutting, the curve II is the pressure distribution of bearing elastic support 2 after cutting, the curve II shows, bearing elastic support 2 bearing capacity after cutting obviously increases.internal projection 2.1.1 and the outer lug 2.1.2 of blade profile radial bearing Flexible element 5 highly are respectively h1 and h2, the inside and outside degree of depth of namely corroding, h1 and h2 can be the same or different, during h1=h2, only need can reach requirement through once corroding inner and outer surface, when h1 ≠ h2, corrosion need be carried out at twice, namely first will one side coat fully can etch-proof coating, another side is first corroded, control the time well, after the another side corrosion depth reaches requirement, the coating removal of the part that the one side of complete coated need to be corroded, put into chemical corrosion liquid or electrochemical corrosive liquid corrodes, controlling the time well according to required corrosion depth gets final product.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
The content that is not described in detail in this specification belongs to the known prior art of related domain professional and technical personnel.
Claims (6)
1. foil dynamical pressure bearing resilient supporting unit, it is characterized in that: it comprises the bearing elastic support (2) that is comprised of bearing elastic support body (2.4) and first key (2.3), described first key (2.3) is arranged at an end of bearing elastic support body (2.4), first key (2.3) is 70 °～100 ° with bearing elastic support body (2.4), and the upper inner and outer surface of described bearing elastic support body (2.4) is provided with many projections (2.1); Described bearing elastic support body (2.4) is provided with many bearing grooves (2.2), described bearing groove (2.2) and projection (2.1) intercross arrangement; Described bearing groove (2.2) has many rows, and the spacing of arranging between bearing groove (2.2) is reduced by bearing groove (2.2) center gradually; Spacing between described many projections (2.1) is reduced to the other end gradually by first key (2.3).
2. foil dynamical pressure bearing resilient supporting unit according to claim 1, is characterized in that: projection (2.1) the interval layout of described bearing elastic support body (2.4) inner and outer surface.
3. foil dynamical pressure bearing resilient supporting unit according to claim 1, it is characterized in that: the unfolded drawing of described bearing elastic support (2) is rectangular or eccentric circular ring.
4. foil dynamical pressure bearing resilient supporting unit according to claim 1 is characterized in that: projection (2.1) thickness of the inside and outside both sides of described bearing elastic support body (2.4) is not identical.
5. method of making foil dynamical pressure bearing resilient supporting unit as claimed in claim 1 is characterized in that:
A, coating on bearing elastic support body (2.4) place that needs to reserve projection (2.1) can etch-proof coating;
B, the bearing elastic support body (2.4) that will coat coating are put into chemical corrosion liquid or electrochemical corrosive liquid;
The thickness of the projection (2.1) that C, the time setting of by control, corroding need to form, corrode rear taking-up bearing elastic support body (2.4);
D, the part that will be corroded are removed from bearing elastic support body (2.4);
E, with coating removal.
6. the method for making foil dynamical pressure bearing resilient supporting unit according to claim 5, is characterized in that: cut out out bearing groove (2.2) by the method for stamping-out or line cutting on bearing elastic support body (2.4) before to bearing elastic support body (2.4) coated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103441750A CN102434580B (en) | 2011-11-04 | 2011-11-04 | Elastic support device for foil dynamic bearing and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103441750A CN102434580B (en) | 2011-11-04 | 2011-11-04 | Elastic support device for foil dynamic bearing and manufacturing method thereof |
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| CN102434580A CN102434580A (en) | 2012-05-02 |
| CN102434580B true CN102434580B (en) | 2013-11-20 |
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| CN2011103441750A Expired - Fee Related CN102434580B (en) | 2011-11-04 | 2011-11-04 | Elastic support device for foil dynamic bearing and manufacturing method thereof |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943813B (en) * | 2012-11-19 | 2014-12-10 | 湖南大学 | Radial foil piece gas bearing with windowing type bulged support foil piece |
| JP2017101726A (en) * | 2015-12-01 | 2017-06-08 | Ntn株式会社 | Foil bearing |
| CN106451894A (en) * | 2016-12-05 | 2017-02-22 | 中国工程物理研究院机械制造工艺研究所 | High-speed permanent magnet motor using aerodynamic pressure foil bearings for supporting |
| CN106523518A (en) * | 2016-12-16 | 2017-03-22 | 南京航空航天大学 | Variable-width type bump foil aerodynamic gas radial bearing and mounting method thereof |
| CN110418903B (en) * | 2017-03-15 | 2021-01-15 | 株式会社Ihi | Radial foil bearing |
| CN107725593A (en) * | 2017-11-09 | 2018-02-23 | 西安交通大学 | Elastic bearing Foil gas bearing with the pre- wedge shape space of inherent structure |
| DE102018213697A1 (en) * | 2018-08-15 | 2020-02-20 | Robert Bosch Gmbh | Air bearing, storage unit and compressor |
| CN110566571A (en) * | 2019-08-09 | 2019-12-13 | 珠海格力电器股份有限公司 | elastic foil gas dynamic pressure bearing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS59197614A (en) * | 1983-04-23 | 1984-11-09 | Ishikawajima Harima Heavy Ind Co Ltd | Bearing construction |
| FR2641046B1 (en) * | 1988-12-23 | 1991-04-05 | Abg Semca | |
| US5902049A (en) * | 1997-03-28 | 1999-05-11 | Mohawk Innovative Technology, Inc. | High load capacity compliant foil hydrodynamic journal bearing |
| CN202360588U (en) * | 2011-11-04 | 2012-08-01 | 武汉航达航空科技发展有限公司 | Elastic supporting device for foil dynamic pressure bearing |
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