CN113464385A - Wind driven generator hub structure and wind driven generator - Google Patents
Wind driven generator hub structure and wind driven generator Download PDFInfo
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- CN113464385A CN113464385A CN202110844898.0A CN202110844898A CN113464385A CN 113464385 A CN113464385 A CN 113464385A CN 202110844898 A CN202110844898 A CN 202110844898A CN 113464385 A CN113464385 A CN 113464385A
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- 230000007704 transition Effects 0.000 claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 210000003734 kidney Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 241000282326 Felis catus Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/21—Rotors for wind turbines
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention provides a wind driven generator hub structure and a wind driven generator, the hub structure comprises a hub body, a main shaft connecting flange and at least one blade bearing flange, the main shaft connecting flange and the at least one blade bearing flange are arranged on the hub body, a web plate is arranged on the inner side of each blade bearing flange, the inner wall of the hub body comprises a first curved surface used for connecting the inner end surface of the web plate and the inner end surface of the main shaft connecting flange in a smooth transition mode, the first curved surface comprises a first transition curved surface tangent to the inner end surface of the web plate, the first transition curved surface comprises a transition curve, the transition curve is an intersection line of the first transition curved surface and the first section, the first section is perpendicular to the inner end surface of the web plate and passes through the central point of the inner end surface of the web plate, the transition curve is a non-arc curve, the curvature radius of the transition curve is larger than the radius of the first arc, and the first arc radius is the radius when the transition curve is an arc. The invention can reduce the stress concentration effect at the chamfer angle at the inner side of the web plate.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a wind driven generator hub structure and a wind driven generator.
Background
The hub is an important part of a wind generating set, and in the structure of the wind generating set, the hub is connected with a main shaft and blades of a fan. The blades are mounted on the hub through a variable pitch bearing, the main shaft of the fan is mounted on the hub through a main shaft flange, and the size, the weight and the like of the hub are controlled within a reasonable range based on the limitation of manufacturing cost and land transportation conditions.
However, with the development of wind power technology, the fan is continuously developed towards a large impeller, the design of the hub tends to be large in diameter along with the increase of load, the outer edge of the hub is closer to a main shaft flange, the transition of the inner side position of a web plate of the hub is severe, stress concentration is obvious, the service life of the hub is greatly shortened, and the safety problem is caused.
Disclosure of Invention
The invention solves the problem that the service life of the hub is influenced by the stress concentration of the inner side of the web plate of the hub.
In order to solve the above problems, the present invention provides a hub structure of a wind turbine, including: the inner side of the blade bearing flange is provided with a web plate, the inner wall of the hub body comprises a first curved surface used for connecting the inner end surface of the web plate with the inner end surface of the main shaft connecting flange in a smooth transition mode, the first curved surface comprises a first transition curved surface tangent to the inner end surface of the web plate, the first transition curved surface comprises a transition curve, the transition curve is the intersection line of the first transition curved surface and a first section, and the first section is perpendicular to the inner end surface of the web plate and passes through the central point of the inner end surface of the web plate; the transition curve is a non-circular arc curve, and the curvature radius of the transition curve is larger than the radius of a first circular arc, wherein the radius of the first circular arc is the radius of the transition curve when the transition curve is a circular arc.
Preferably, the transition curve is an arc line between a long axis end point and a short axis end point on an elliptic curve, a projection of the long axis of the elliptic curve on the surface where the web is located is along the radial direction of the web, and a projection of the short axis of the elliptic curve on an extending surface of the inner end surface of the main shaft connecting flange is along the radial direction of the main shaft connecting flange.
Preferably, the transition curve is an arc on a parabola, and the end point of the arc is the vertex of the parabola, and the opening direction of the parabola faces to the inner side of the hub body.
Preferably, the first curved surface further comprises a second transition curved surface tangent to the inner end surface of the main shaft connecting flange.
Preferably, the outer end face of the web and the inner end face of the blade bearing flange are in arc transition.
Preferably, the web is provided with a plurality of process holes for assisting in mounting blade mounting bolts.
Preferably, the fabrication hole is a kidney-shaped hole.
Preferably, the hub body outer wall is provided with at least one personnel access hole.
Preferably, the hub body is provided with at least one mounting opening, the number of the mounting openings corresponds to the number of the blade bearing flanges, and the mounting openings are circumferentially arranged around the outer wall of the hub body at intervals.
Compared with the prior art, the hub structure of the wind driven generator has the following beneficial effects:
the transition curve of the transition between the web plate and the main shaft connecting flange is optimized, the transition curve is optimized to be a curve with the curvature radius larger than that of the circular arc, the shape of the transition curve is smoother than that of the circular arc, so that the position where stress is concentrated is transited more smoothly, and the stress concentration effect at the inner chamfer of the web plate is reduced.
The invention also provides a wind driven generator, which comprises the wind driven generator hub structure.
Compared with the prior art, the wind driven generator has the same beneficial effects as the hub structure of the wind driven generator has in the prior art, and the description is omitted.
Drawings
FIG. 1 is a schematic overall structural view of a hub structure of a wind turbine according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a hub structure of a wind turbine according to an embodiment of the present invention;
FIG. 3 is an enlarged view taken at point I in FIG. 2;
FIG. 4 is a schematic diagram of a prior art transition curve in the shape of a circular arc;
FIG. 5 is a schematic view of an embodiment of the present invention in which the transition curve is an arc on an ellipse;
fig. 6 is a schematic diagram of an arc segment of a parabola as a transition curve in an embodiment of the invention.
Description of reference numerals:
1-a hub body; 2-a main shaft connecting flange; 3-a blade bearing flange; 4-a web; 5-transition curve; 6-a first curved surface; 7-first cross section.
Detailed Description
In a wind generating set, the hub not only bears the load, but also is connected with the blade or the variable-pitch bearing, the fan main shaft and the air guide sleeve. The hub is provided with a boss and a web plate for mounting and positioning the variable-pitch bearing, the variable-pitch bearing is mounted on the boss, and a mounting space for mounting the blades is formed between the variable-pitch bearing and the web plate. The hub is provided with a main shaft flange for installing a main shaft of the fan.
In the prior art, the development of large blades is a trend, and with the increase of the radius of a variable pitch bearing, the outer edge of a hub is closer to a main shaft flange, so that the axial space of the hub between the main shaft flange and the variable pitch bearing is reduced, and the axial direction refers to the axial direction of the main shaft flange. The closer the main shaft flange is to the part of the hub connected with the blade root, the closer the included angle between the main shaft flange and the end face of the hub is to a right angle, and therefore stress at the position of the inner side chamfer of the web plate is increased. In addition, the spindle flange cannot be moved in the axial direction away from the hub, even with the cost and land transportation requirements.
The hub is a key factor influencing the long-term reliable operation of the wind generating set, and therefore the problem that the stress concentration on the inner side of a web plate of the hub is caused by the fact that the axial space of the hub between a main shaft flange and a variable pitch bearing is reduced due to the fact that the diameter of the hub is increased is a key problem to be solved urgently in the field.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 to 3, an embodiment of the invention provides a hub structure of a wind turbine, including: the hub comprises a hub body 1, a main shaft connecting flange 2 and at least one blade bearing flange 3, wherein the main shaft connecting flange 2 and the at least one blade bearing flange 3 are arranged on the hub body 1, a web 4 is arranged on the inner side of each blade bearing flange 3, the inner wall of the hub body 1 comprises a first curved surface 6 which is used for connecting the inner end surface of the web 4 with the inner end surface of the main shaft connecting flange 2 in a smooth transition mode, the first curved surface 6 comprises a first transition curved surface which is tangent to the inner end surface of the web 4, the first transition curved surface comprises a transition curve 5, the transition curve 5 is an intersection line of the first transition curved surface and a first section 7, and the first section 7 is perpendicular to the inner end surface of the web 4 and passes through the central point of the inner end surface of the web 4; the transition curve 5 is a non-circular arc curve, and the curvature radius of the transition curve 5 is greater than a first circular arc radius, wherein the first circular arc radius is a radius when the transition curve is a circular arc.
As shown in fig. 1, the hub body 1 is substantially a spherical structure, at least one mounting opening is formed in the hub body 1, the mounting opening is used for mounting a blade, the blade is fixedly mounted at the mounting opening through a pitch bearing and a blade bearing flange 3, the number of the mounting opening corresponds to the number of the blade bearing flange 3, and the mounting opening is circumferentially spaced around the outer wall of the hub body 1. All set up the mounting hole on the 1 outer wall of wheel hub body between per two adjacent installing ports, the mounting hole is suitable for the installation impeller cat ladder, installs the impeller cat ladder so that install the impeller, and the mounting hole is the bolt hole usually.
In a specific embodiment, the number of the mounting openings may be one, two or three, and correspondingly, the number of the blade bearing flanges 3 may also be one, two or three, thereby obtaining a single-blade wind driven generator, a double-blade wind driven generator or a three-blade wind driven generator. In view of cost and energy conversion rate, a three-blade wind turbine generator with a hub structure including a hub body 1, a main shaft connecting flange 2 and three blade bearing flanges 3 disposed on the hub body 1 is preferred in this embodiment.
The inner side of the blade bearing flange 3 is provided with a web plate 4, and the web plate 4 is arranged in a closed annular surface structure. The inner side means that the direction near the center of the hub body 1 is inner, and vice versa. The setting of web 4 plays the reinforcing action to the installation of hub body 1 and blade, improves the reliability that hub body 1 and blade are connected.
The periphery of web 4 and 1 inner wall connection of wheel hub body, have the chamfer between 4 inboard and the 1 inner wall of wheel hub body of web, 4 inboard chamfer positions of web are because of structural rigidity changes easily produce stress concentration. In the prior art, the transition between the inner end surface of the web 4 and the main shaft connecting flange 2 usually adopts an arc surface transition, that is, the inner wall of the hub body 1 between the inner end surface of the web 4 and the inner end surface of the main shaft connecting flange 2 is an arc surface, that is, the first transition curved surface is an arc surface, and therefore, an intersecting curve between a tangent plane formed by cutting the hub body 1 by the first section 7 and the arc surface is an arc line, as shown in fig. 4. It is to be noted that the first cross section 7 is perpendicular to the inner end surface of the web 4 and passes through the centre point of the inner end surface of the web 4.
Because the wheel hub body 1 usually will set up personnel's access hole, hoist mounting hole and guardrail mounting hole etc.. Therefore, the stress level of the opening on the hub body 1 is concentrated, the effect of reducing stress concentration is slight by thickening the wall thickness of the hub body 1 or locally thickening the opening position, and the whole weight of the hub body 1 can be increased. Stress can be reduced to a certain extent by increasing the arc angle, but because the space of the hub body 1 is limited, the arc angle increase of the chamfer angle of the inner end surface of the web plate 4 can be interfered with other holes on the hub body 1 generally, and therefore the stress concentration problem of the chamfer angle on the inner side of the web plate 4 cannot be solved in the form of arc surface transition between the inner end surface of the web plate 4 and the main shaft connecting flange 2.
In this embodiment, the circular arc-shaped curve of the transition between the web 4 and the main shaft connecting flange 2 is optimized, and the transition curve 5 is optimized to be a curve with a curvature radius larger than that of a circle, that is, the curvature radius of the transition curve 5 is larger than that of the first circular arc, so as to reduce the curvature of the transition curve 5 between the inner end surface of the web 4 and the main shaft connecting flange 2.
It should be noted that the first curved surface 6 between the inner end surface of the web 4 and the inner end surface of the spindle connecting flange 2 includes a first transition curved surface and a second transition curved surface, where the first transition curved surface is a curved surface close to the inner end surface side of the web 4, one end of the first transition curved surface is tangent to the inner end surface of the web 4, the second transition curved surface is a curved surface close to the inner end surface side of the spindle connecting flange 2, and the second transition curved surface is preferably tangent to the inner end surface of the spindle connecting flange 2, and the first transition curved surface and the second transition curved surface are in smooth transition connection. Because this embodiment mainly solves the problem of the inboard chamfer angle department stress concentration of web 4, consequently, increase the radius of curvature with the first transition curved surface inner transition curve that the terminal surface is connected in the web 4, suitably lengthen the axial space of wheel hub body 1 between main shaft flange 2 and web 4, can improve the problem of the inboard stress concentration of web 4.
In one preferred embodiment, as shown in fig. 5, the transition curve 5 is an arc line between the end point of the long axis and the end point of the short axis on the elliptic curve, the projection of the long axis of the elliptic curve on the plane of the web 4 is along the radial direction of the web 4, and the projection of the short axis of the elliptic curve on the plane extending from the end face of the main shaft connecting flange 2 is along the radial direction of the main shaft connecting flange 2.
It should be understood that an elliptic curve has a major axis with two vertices, a minor axis with two vertices, and four vertices, up, down, left, and right, with the major axis end point referring to one of the vertices of the major axis and the minor axis end point referring to one of the vertices of the minor axis. Thus, the arcs between the major and minor axis endpoints on the elliptic curve include the arc between the upper and left vertices, the arc between the upper and right vertices, the arc between the lower and left vertices, and the arc between the lower and right vertices of the ellipse. It will be understood that the transition curve 5 in this embodiment is one of the four arcs described above, and is mainly related to the relative position relationship between the web 4 and the main shaft connecting flange 2, for example, as shown in fig. 1, one of the webs 4 is located on the upper side of the hub body 1, and the main shaft connecting flange 2 is arranged on the right side of the hub body 1, so that the transition curve 5 between the inner end surface of the web 4 and the main shaft connecting flange 2 is an arc between the top point and the right top point of the ellipse.
A transition curve 5 between the inner end surface of the web plate 4 and the main shaft connecting flange 2 is optimized to be a section of arc on an elliptic curve from an arc, so that the curvature radius of the transition position is increased, and the stress concentration is reduced.
In another preferred embodiment, as shown in fig. 6, the transition curve 5 is an arc on a parabola, and the end point of the arc is the vertex of the parabola, and the opening direction of the parabola is towards the inner side of the hub body 1. It is to be understood that a parabola is a locus of points in a plane having an equal distance to a certain point and a certain straight line, the certain point being a focus, the certain straight line being a quasi-line, the parabola being an axisymmetric figure, the symmetry axis being a straight line perpendicular to the quasi-line and passing through the focus, and it is to be understood that an arc line whose end point is a vertex of the parabola is an arc on a curve on one side of the symmetry axis of the parabola. By optimizing the transition curve 5 between the inner end surface of the web plate 4 and the main shaft connecting flange 2 into a section of arc on a parabola, the curvature radius of the inner side chamfer position of the web plate 4 is increased, so that the first transition curved surface between the inner end surface of the web plate 4 and the second transition curved surface is smoother, and the stress concentration is reduced.
In some embodiments, the web 4 is provided with a plurality of process holes for assisting in installing the blade assembling bolts, and the process holes are used for installing the connecting bolts of the variable-pitch blade. Preferably, the fabrication hole is a kidney-shaped hole so as to facilitate the installation and the removal of the bolt of the blade root and the variable pitch bearing.
In order to optimize the stress on the edge of the fabrication hole and reduce the stress concentration effect caused by structural change, in this embodiment, the outer end surface of the web 4 and the inner end surface of the blade bearing flange 3 are in arc transition.
The web 4 is also provided with maintenance holes for structural maintenance of the web 4 to ensure that the web 4 has sufficient strength to enhance the mounting of the blade.
Another embodiment of the invention provides a wind turbine comprising a wind turbine hub structure as described above.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A hub structure of a wind driven generator comprises a hub body (1), and a main shaft connecting flange (2) and at least one blade bearing flange (3) which are arranged on the hub body (1), wherein a web plate (4) is arranged on the inner side of the blade bearing flange (3),
the inner wall of the hub body (1) comprises a first curved surface (6) for connecting the inner end surface of the web plate (4) with the inner end surface of the main shaft connecting flange (2) in a smooth transition way,
the first curved surface (6) comprises a first transition curved surface tangent with the inner end surface of the web plate (4),
the first transition curved surface comprises a transition curve (5), the transition curve (5) is an intersection line of the first transition curved surface and a first cross section (7), wherein the first cross section (7) is perpendicular to the inner end surface of the web plate (4) and passes through the central point of the inner end surface of the web plate (4);
the transition curve (5) is a non-circular arc curve, and the curvature radius of the transition curve (5) is larger than a first circular arc radius, wherein the first circular arc radius is the radius of the transition curve when the transition curve is a circular arc.
2. Wind turbine hub structure according to claim 1, wherein the transition curve (5) is an arc between the end point of the major axis and the end point of the minor axis of an elliptic curve, and the projection of the major axis of the elliptic curve on the inner end surface of the web (4) is arranged in the radial direction of the web (4), and the projection of the minor axis of the elliptic curve on the inner end surface of the main shaft connecting flange (2) is arranged in the radial direction of the main shaft connecting flange (2).
3. Aerogenerator hub structure according to claim 1, characterized in that the transition curve (5) is an arc on a parabola, the end points of which are the vertices of the parabola, the opening direction of which is towards the inside of the hub body (1).
4. Wind turbine hub structure according to claim 1, wherein the first curved surface (6) further comprises a second curved transition surface tangential to the inner end surface of the main shaft connecting flange (2), the second curved transition surface being in smooth transition connection with the first curved transition surface.
5. Wind turbine hub structure according to claim 1, wherein the inner wall of the hub body (1) further comprises an arc-shaped curved surface for smooth transition connection of the outer end surface of the web (4) with the inner end surface of the blade bearing flange (3).
6. Wind turbine hub structure according to claim 1, wherein said web (4) is provided with a plurality of fabrication holes for auxiliary mounting of blade mounting bolts.
7. The wind turbine hub structure of claim 6, wherein the fabrication holes are kidney shaped holes.
8. Wind turbine hub structure according to claim 1, wherein said hub body (1) is provided with at least one personnel access hole.
9. Wind turbine hub structure according to claim 1, wherein said hub body (1) is provided with at least one mounting opening corresponding in number to the number of blade bearing flanges (3), a plurality of said mounting openings being circumferentially spaced around the outer wall of said hub body (1).
10. A wind power generator, characterized by comprising a wind power generator hub structure according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110844898.0A CN113464385A (en) | 2021-07-26 | 2021-07-26 | Wind driven generator hub structure and wind driven generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110844898.0A CN113464385A (en) | 2021-07-26 | 2021-07-26 | Wind driven generator hub structure and wind driven generator |
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| Publication Number | Publication Date |
|---|---|
| CN113464385A true CN113464385A (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110844898.0A Pending CN113464385A (en) | 2021-07-26 | 2021-07-26 | Wind driven generator hub structure and wind driven generator |
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| WO2003064854A1 (en) * | 2002-01-31 | 2003-08-07 | Neg Micon A/S | Blade-hub for a wind turbine |
| WO2012130240A1 (en) * | 2011-03-30 | 2012-10-04 | Vestas Wind Systems A/S | A hub for a wind turbine |
| EP2653719A2 (en) * | 2012-04-19 | 2013-10-23 | General Electric Company | Hub for wind turbine rotor |
| CN204200489U (en) * | 2014-11-10 | 2015-03-11 | 北京金风科创风电设备有限公司 | The wheel hub of wind-driven generator |
| CN107139649A (en) * | 2017-05-16 | 2017-09-08 | 西安航空制动科技有限公司 | A kind of airplane wheel component |
| CN211314446U (en) * | 2019-10-24 | 2020-08-21 | 中国船舶重工集团海装风电股份有限公司 | Wind generating set and hub thereof |
| CN111894794A (en) * | 2020-09-10 | 2020-11-06 | 明阳智慧能源集团股份公司 | Two-blade wind generating set hub |
-
2021
- 2021-07-26 CN CN202110844898.0A patent/CN113464385A/en active Pending
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|---|---|---|---|---|
| WO2003064854A1 (en) * | 2002-01-31 | 2003-08-07 | Neg Micon A/S | Blade-hub for a wind turbine |
| WO2012130240A1 (en) * | 2011-03-30 | 2012-10-04 | Vestas Wind Systems A/S | A hub for a wind turbine |
| EP2653719A2 (en) * | 2012-04-19 | 2013-10-23 | General Electric Company | Hub for wind turbine rotor |
| US20130280089A1 (en) * | 2012-04-19 | 2013-10-24 | General Electric Company | Hub for wind turbine rotor |
| CN204200489U (en) * | 2014-11-10 | 2015-03-11 | 北京金风科创风电设备有限公司 | The wheel hub of wind-driven generator |
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Application publication date: 20211001 |
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