CN102723805B - Method for improving kinetic stability of high-stored-energy flywheel metal hub - Google Patents
Method for improving kinetic stability of high-stored-energy flywheel metal hub Download PDFInfo
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- CN102723805B CN102723805B CN201210207276.8A CN201210207276A CN102723805B CN 102723805 B CN102723805 B CN 102723805B CN 201210207276 A CN201210207276 A CN 201210207276A CN 102723805 B CN102723805 B CN 102723805B
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- wheel hub
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- outer ring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention discloses a method and a device for improving kinetic stability of a metal hub of a high-stored-energy flywheel. By changing the geometric dimension of the metal hub of the high-stored-energy flywheel, the natural frequency of the metal hub is changed to avoid resonance resulting from the fact that the natural frequency of the metal hub and the working frequency of the metal hub are the same; and a deflection torque is generated in the rotation process of the hub to prevent the edge of the hub from falling off from the hub and keep the magnitude of interference of the hub, so as to improve the kinetic stability of the metal hub. The natural frequency and the center of the centrifugal force of the hub are changed by changing the geometric dimension of the metal hub, therefore, not only is the probability of resonance generated in the operation is effectively reduced, but also the problem of loss of magnitude of interference of the edge of the hub and the metal hub is effectively solved, and the kinetic stability of the metal hub is improved.
Description
Technical field
The present invention relates to machine science field, especially a kind of method and device that improves high accumulated energy flywheel metal wheel hub dynamic stability.
Background technology
High energy-storing flywheel system as a kind of long service life, polluted the existing 30 years of researches history of the mechanical energy storing device little, maintenance cost is low.At the initial stage, the main element of energy storage is wheel rim rotor, is conventionally formed by metal manufacture, and as high strength steel, but huge centrifugal force will make metallic rotator be split into three bulks when High Rotation Speed.Energy storage total amount not only to square being directly proportional of flywheel mass, rotary speed, and be directly proportional to the ratio of rotor material hot strength, density, therefore reduce quality, increase speed and can improve to greatest extent the energy storage total amount of flywheel energy storage system.Composite material rotor has the feature that intensity is high, density is little compared with metallic rotator, can store more energy.Resin base fiber reinforced composite material like this, as carbon fibre or glass, has the advantages that intensity is high, density is little, is desirable flywheel rim rotor manufactured materials, occupies an important seat in high accumulated energy flywheel.
High running speed has brought great centrifugal force, produces high radial stress, circumferential stress in wheel rim.The reciprocation of radial stress and circumferential stress radially outwards expands composite material wheel rim.Flywheel metal wheel hub is as the connector that keeps interference fit between wheel rim and gyroaxis, and metal alloy or composite material higher by intensity, that quality is less are made conventionally.Metal alloy metal wheel hub provides the strength and stiffness of flywheel assembly.But the deflection of the radial-deformation of metal wheel hub and composite material wheel rim is not on the same order of magnitude, wheel rim separates with metal wheel hub like this, produce sharply vibration, the metal wheel hub of being made up of composite material is flexible better, can reduce separating of metal wheel hub and wheel rim, but composition metal wheel hub is usually because rigidity is inadequate, himself critical whirling speed is little compared with design and operation rotating speed.
When the composite material wheel rim of interference fit separates with metal wheel hub, will bring the high vibration that is difficult to imagination while producing gap.In the time of this vibration frequency and flywheel assembly and each part generation resonance, can directly destroy operating high energy-storing flywheel system.But common correlation technique is devoted to solve flywheel assembly and consistency problem ultralight, high-strength composite material wheel rim.
The disclosed two kinds of metal wheel hub structures of Chinese patent (patent No. ZL 200410010855.9) are respectively the titanium alloy metal wheel hubs that the metal wheel hub that is connected with internal rotor is made up of interior ring, outer shroud and spoke, be connected with external rotor, the titanium alloy metal wheel hub being formed by interior ring, outer shroud, spoke, magnetic guiding loop, and the process for making of metal wheel hub, in this method, do not relate to critical whirling speed and the response thereof of rotor, rotor will produce sharply vibration while passing through first critical speed.
Summary of the invention
The object of the invention is: a kind of method and device that improves high accumulated energy flywheel metal wheel hub dynamic stability is provided, it can reduce high-speed cruising hour wheel and lose because of the metal wheel hub magnitude of interference, and reduce the resonance possibility while operation, to overcome the deficiencies in the prior art.
The present invention is achieved in that the method that improves high accumulated energy flywheel metal wheel hub dynamic stability, it is characterized in that: by changing the physical dimension of metal wheel hub of high accumulated energy flywheel, the natural frequency of metal wheel hub is changed, thereby avoid the natural frequency of metal wheel hub identical with its operating frequency and produce and resonate; And make wheel hub in rotation process, produce a deflection torque, and avoid wheel rim to come off from wheel hub, keep its magnitude of interference, to improve the dynamic stability of metal wheel hub.
High accumulated energy flywheel metal wheel hub, comprises inner ring, and outer ring is connected with web between inner ring and outer ring, and inner ring top is less by 1/3～1/2 to the vertical length at center than inner ring bottom to the vertical length at center.
On outer ring, be provided with vertically to equally distributed groove.On outer ring, fluting is divided into several by groove by the outer ring of metal wheel hub, has so not only interrupted circumferential stress transmission, promotes the radially extension in turning course, produces interfacial stress, just reduces value of interference fit and carrys out transmitting torque; And this compression is also by the radial drawing stress reducing in wheel rim, can improve total energy storage.This structure can increase the compatibility of metal wheel hub and composite material wheel rim, ensures the magnitude of interference of wheel rim and metal wheel hub, can change the stress state of wheel hub itself, improves its deflection.
The outer wall of outer ring is back taper, and its tapering is 1:150.Back taper can ensure axiality and the magnitude of interference of wheel rim and metal wheel hub.
The link position of web and inner ring and outer ring is provided with chamfering, and the radius of curvature of chamfering is web length 1/5.Web provides rigidity, rigidity and web thickness proportion relation for metal wheel hub.Web thickness is thicker, provides rigidity higher.
The present invention adopts the non-uniform thickness in metal wheel hub cross section to design, and can save material, improve critical frequency and operation rotating speed, and better reduction assembled cooling time.
The present invention considers, in the situation of metal wheel hub dynamic performance and distortion, intensity, metal wheel hub structure to be designed at the same time.Select the physical dimension of metal wheel hub, as web thickness, faying face length, inner ring, outer ring thickness design, in design process, adopt finite element analysis, as used ANSYS finite element analysis software to carry out interaction design.
Metal wheel hub structure in the present invention, it is 1.4-3 times that its critical whirling speed exceedes working speed multiple.In the present invention, the design operation rotating speed of metal wheel hub is 16000 revs/min (RPM), and corresponding design operation frequency is 266.7HZ, and this metal wheel hub is made up of 3J33.In metal wheel hub structure, known by finite element analysis in the present invention, outer ring thickness is 18mm.It is large that the coefficient of friction of axle and metal wheel hub is taken turns intermarginal coefficient of friction compared with metal wheel hub and composite material, and therefore outer ring length is more longer compared with inner ring, to ensure to provide and the enough frictional resistance of inner ring place same order.Metal wheel hub structure in the present invention, under normal running rotating speed, its radial deformation ensures to contact with composite material wheel rim, such as interference fit.
Owing to adopting above-mentioned technical scheme, compared with prior art, the present invention adopts the mode that changes metal wheel hub physical dimension to change its natural frequency, and centrifugal force center, both effectively reduced the possibility that produces resonance in running, can efficiently solve again the problem of wheel rim and the loss of the metal wheel hub magnitude of interference, improve the dynamic stability of metal wheel hub; The inventive method is simple, and the structure adopting is easily made, with low cost, and result of use is good.
Accompanying drawing 1 is structural representation of the present invention.
Embodiment;
Embodiments of the invention 1: the method that improves high accumulated energy flywheel metal wheel hub dynamic stability, by changing the physical dimension of metal wheel hub of high accumulated energy flywheel, the natural frequency of metal wheel hub is changed, thereby avoid the natural frequency of metal wheel hub identical with its operating frequency and produce and resonate; And make wheel hub in rotation process, produce a deflection torque, and avoid wheel rim to come off from wheel hub, keep its magnitude of interference, to improve the dynamic stability of metal wheel hub.
The structure of high accumulated energy flywheel metal wheel hub as shown in Figure 1, comprises inner ring 1, and outer ring 3 is connected with web 2 between inner ring 1 and outer ring 3, and inner ring 1 top is less by 1/2 to the vertical length at center than inner ring 1 bottom to the vertical length at center; On outer ring 3, be provided with vertically to equally distributed groove 5; The outer wall of outer ring 3 is back taper, and its tapering is 1:150; Web 2 is provided with chamfering 4 with the link position of inner ring 1 and outer ring 3, and the radius of curvature of chamfering 4 is web length 1/5.
Outer ring 3, inner ring 1 and the web 2 of metal wheel hub can adopt high duty metal, as titanium alloy TC 4, aluminium alloy 7075, elastic alloy 3J33 etc.The good cost performance of aluminium alloy.
While choosing metal wheel hub critical frequency coefficient of safety, relevant to supporting, in the present embodiment, choose 3 for coefficient of safety, critical whirling speed is 48000 revs/min (RPM), corresponding design operation frequency is 800HZ.Metal wheel hub structure under high speed operation rotating speed, 16000 revs/min (RPM), corresponding design operation frequency is 266.7HZ, needs to ensure that effective contact-making surface length minimum of outer ring and wheel rim is 412mm.
Product of the present invention, in the time of low operation rotating speed, is not considered the distortion of composite wheel rim, and when rotating speed increases, wheel rim deforms, and deflection occurs in the outer ring 3 of resultant metal wheel hub of the present invention, to ensure interference fit, also can reduce the tangential stress between wheel rim and metal wheel hub.Like this, because critical speed and the frequency of the metal wheel hub in the present invention self are higher, therefore can not resonate.
When product of the present invention and composite wheel rim assemble, the initial magnitude of interference adopts cold charge and pressure to assemble the mode combining and ensures.Chilling temperature is subzero 145 DEG C; Be 30 minutes cooling time, and being pressed into length is 75mm, and pressing-in force is 270KN, and press-in speed is 4m/s, after press-fiting, keeps axial compressive force 30min.
Claims (1)
1. one kind is improved the method for high accumulated energy flywheel metal wheel hub dynamic stability, it is characterized in that: by changing the physical dimension of metal wheel hub of high accumulated energy flywheel, the natural frequency of metal wheel hub is changed, thereby avoid the natural frequency of metal wheel hub identical with its operating frequency and produce and resonate; And make wheel hub in rotation process, produce a deflection torque, and avoid wheel rim to come off from wheel hub, keep its magnitude of interference, to improve the dynamic stability of metal wheel hub; High accumulated energy flywheel metal wheel hub comprises inner ring (1), outer ring (3), between inner ring (1) and outer ring (3), be connected with web (2), it is characterized in that: inner ring (1) top is less by 1/3～1/2 to the vertical length at center than inner ring (1) bottom to the vertical length at center; On outer ring (3), be provided with vertically to equally distributed groove (5); The outer wall of outer ring (3) is back taper, and its tapering is 1:150; The link position of web (2) and inner ring (1) and outer ring (3) is provided with chamfering (4), and the radius of curvature of chamfering (4) is web length 1/5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207276.8A CN102723805B (en) | 2012-06-21 | 2012-06-21 | Method for improving kinetic stability of high-stored-energy flywheel metal hub |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207276.8A CN102723805B (en) | 2012-06-21 | 2012-06-21 | Method for improving kinetic stability of high-stored-energy flywheel metal hub |
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| Publication Number | Publication Date |
|---|---|
| CN102723805A CN102723805A (en) | 2012-10-10 |
| CN102723805B true CN102723805B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210207276.8A Expired - Fee Related CN102723805B (en) | 2012-06-21 | 2012-06-21 | Method for improving kinetic stability of high-stored-energy flywheel metal hub |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108321977A (en) * | 2018-03-06 | 2018-07-24 | 广东电网有限责任公司电力科学研究院 | One kind dividing valve circular ring shell alloy wheel hub combined accumulation energy flywheel |
| CN113595322A (en) * | 2021-07-29 | 2021-11-02 | 中国科学院工程热物理研究所 | Anti-disengagement flywheel structure and flywheel energy storage system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4860611A (en) * | 1986-08-15 | 1989-08-29 | Flanagan Ralph C | Energy storage rotor with flexible rim hub |
| CN1592044A (en) * | 2004-05-12 | 2005-03-09 | 中国科学院长春光学精密机械与物理研究所 | High-Energy accumulation density flywheel hub structure and making method thereof |
| CN202073979U (en) * | 2010-12-17 | 2011-12-14 | 上海复合材料科技有限公司 | Flywheel with composite material structure |
| CN202280752U (en) * | 2011-10-27 | 2012-06-20 | 南通大通宝富风机有限公司 | Novel hub |
| CN202651976U (en) * | 2012-06-21 | 2013-01-02 | 贵州大学 | High energy-storage metal wheel hub of flywheel |
-
2012
- 2012-06-21 CN CN201210207276.8A patent/CN102723805B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4860611A (en) * | 1986-08-15 | 1989-08-29 | Flanagan Ralph C | Energy storage rotor with flexible rim hub |
| CN1592044A (en) * | 2004-05-12 | 2005-03-09 | 中国科学院长春光学精密机械与物理研究所 | High-Energy accumulation density flywheel hub structure and making method thereof |
| CN202073979U (en) * | 2010-12-17 | 2011-12-14 | 上海复合材料科技有限公司 | Flywheel with composite material structure |
| CN202280752U (en) * | 2011-10-27 | 2012-06-20 | 南通大通宝富风机有限公司 | Novel hub |
| CN202651976U (en) * | 2012-06-21 | 2013-01-02 | 贵州大学 | High energy-storage metal wheel hub of flywheel |
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| CN102723805A (en) | 2012-10-10 |
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