CN115111249A - Embedded bolt sleeve and wind driven generator - Google Patents
Embedded bolt sleeve and wind driven generator Download PDFInfo
- Publication number
- CN115111249A CN115111249A CN202210920730.8A CN202210920730A CN115111249A CN 115111249 A CN115111249 A CN 115111249A CN 202210920730 A CN202210920730 A CN 202210920730A CN 115111249 A CN115111249 A CN 115111249A
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- China
- Prior art keywords
- sleeve
- groove
- depth
- embedded bolt
- bolt sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007423 decrease Effects 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 abstract description 19
- 238000010008 shearing Methods 0.000 abstract description 13
- 239000010410 layer Substances 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
-
- 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
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
Abstract
The invention provides a buried bolt sleeve, which comprises a sleeve, wherein a plurality of groove areas are arranged on the outer surface of the sleeve at intervals along the axial direction of the sleeve, and the groove areas have two or more depths. Through the arrangement, the shearing state of the combined cross section of the embedded bolt sleeve and the glass fiber under the drawing of the embedded bolt sleeve is converted into the shearing between the glass fiber layers of the cylindrical enveloping area of the outer surface of the shallow groove, so that the shearing strength is improved, and the drawing limit endurance of the embedded bolt sleeve at the root of the blade is improved.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to an embedded bolt sleeve and a wind driven generator.
Background
The wind power generator can convert wind energy into mechanical energy and further into electric energy. A wind generator typically includes a tower, a nacelle connected to the tower and supporting a hub. Two or more fan blades are arranged on the hub, wherein the fan blades rotate a rotor arranged in the hub about an axis under the influence of wind, wherein rotation of the rotor of the generator relative to the stator generates electrical energy.
The fan blades are typically secured to the hub by root bolts. At present, the root bolt mostly adopts an embedded bolt sleeve process, and the embedded bolt sleeve is matched with the root bolt so as to realize the connection of the blade root of the fan blade and the variable pitch bearing in the hub. And when the root bolt is meshed with the embedded bolt sleeve, the root bolt, the embedded bolt sleeve and the blade root material bear the external limit and the fatigue load together.
Along with the development of the wind power industry, the size and the weight of the fan blade are larger and larger, so that the load of the blade root is correspondingly improved, and the requirement on the connection strength of the root of the fan blade and the hub is higher. In order to enhance the connection endurance of the blade root, the existing embedded bolt sleeve is usually provided with a tooth shape or a boss and other structures on the outer surface, so that the embedded bolt sleeve can be better combined with the blade material. However, the drawing stress of the existing embedded bolt sleeve at the blade root of the blade is mainly the shearing of the glass fiber bonding surface of the embedded bolt sleeve and the blade, and the shearing strength is weak.
Disclosure of Invention
In order to improve the limit drawing resistance of the embedded bolt sleeve, the invention provides the embedded bolt sleeve which comprises a sleeve, wherein a plurality of groove areas are arranged on the outer surface of the sleeve at intervals along the axial direction of the sleeve, and the groove areas have two or more depths.
Furthermore, any two adjacent trench regions include a deep trench region and a shallow trench region, wherein the deep trench region includes a first trench, and the shallow trench region includes a plurality of second trenches, and the depth of the first trench is greater than that of the second trench.
Further, the depth of any two deep groove regions is the same, and the depth of the groove is not less than 1 mm.
Further, the depth of the trench in any two deep trench regions is different, but the depth of the trench in any deep trench region is not less than 1 mm.
Further, the groove depth of the deep groove region is sequentially increased or decreased along the axial direction.
Further, the depth of the grooves of any two shallow groove regions is the same, and the depth of the grooves is not less than 0.5 mm.
Furthermore, the depth of the trench of any two shallow trench regions is different, but the depth of the trench of any shallow trench region is not less than 0.5 mm.
Further, the depth of the shallow trench area is increased or decreased along the axial direction.
Further, the heights of any two deep trench regions are the same or different.
Further, the heights of any two shallow trench regions are the same or different.
Furthermore, chamfers are arranged between any adjacent first groove and second groove and/or between any adjacent first groove and second groove.
The invention also provides a wind driven generator, wherein a blade root of the wind driven generator comprises the embedded bolt sleeve, the embedded bolt sleeve is used for fixing the first end of a blade root bolt, and the second end of the blade root bolt is fixed with the inner ring of the variable pitch bearing through an inner ring nut of the variable pitch bearing, so that the end surface of the blade root is attached to the inner ring of the variable pitch bearing.
According to the embedded bolt sleeve provided by the invention, the outer surface of the embedded bolt sleeve is processed into at least two grooves with different depths and distributed in a staggered manner, and then the shearing state of the combined section of the embedded bolt sleeve and glass fibers after the embedded bolt sleeve is drawn is converted into glass fiber interlayer shearing of a cylindrical enveloping area of the outer surface of a shallow groove. Because the shear strength of the combination interface of the embedded bolt sleeve and the glass fiber is less than the shear strength between glass fiber layers, the embedded bolt sleeve can effectively improve the drawing limit endurance of the embedded bolt sleeve at the root of the blade by adding the shallow groove characteristic.
Drawings
To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.
Fig. 1 shows a schematic view of a pre-buried bolt sleeve according to an embodiment of the present invention;
FIG. 2 shows a schematic cross-sectional view of a pre-buried bolt sleeve according to an embodiment of the present invention;
FIG. 3 is a schematic view of two adjacent groove regions of a sleeve of a fastener bolt according to an embodiment of the invention;
FIGS. 4a and 4b are schematic views of a bolt bushing for connecting blade roots according to an embodiment of the present invention; and
FIG. 5 illustrates a wind turbine employing an embodiment of the present invention.
Detailed Description
The invention is further elucidated with reference to the drawings in conjunction with the detailed description. It should be noted that the components in the figures may be exaggerated and not necessarily to scale for illustrative purposes. In the figures, identical or functionally identical components are provided with the same reference symbols.
In the present invention, "disposed on …", "disposed over …" and "disposed over …" do not exclude the presence of an intermediate therebetween, unless otherwise specified. Further, "disposed on or above …" merely indicates a relative positional relationship between the two components, and may also be converted to "disposed below or below …" and vice versa in certain cases, such as after reversing the product direction.
In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.
In the present invention, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise specified.
It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that, given the teachings of the present invention, required components or assemblies may be added as needed in a particular scenario.
It is also noted herein that, within the scope of the present invention, the terms "same", "equal", and the like do not mean that the two values are absolutely equal, but allow some reasonable error, that is, the terms also encompass "substantially the same", "substantially equal". By analogy, in the present invention, the terms "perpendicular", "parallel" and the like in the directions of the tables also cover the meanings of "substantially perpendicular", "substantially parallel".
The endurance of the connection of the blade and the blade root of the wind driven generator is a key factor for limiting the cost of the whole machine, and the existing blade usually adopts the embedded bolt sleeve process to realize the fixation of the bolt of the blade root, so the ultimate drawing endurance of the embedded bolt sleeve is an important factor for influencing the endurance of the connection of the blade root. The existing embedded bolt sleeve is enabled to be embedded into the inner glass fiber layer and the outer glass fiber layer of the fan blade through the corrugated concave-convex arrangement arranged on the surface, so that the extraction load of the embedded bolt sleeve is increased, and the bearing capacity is improved. However, the inventor finds that by adopting the design, the concave section and the convex section are both cylindrical surfaces, and the drawing stress state of the embedded bolt sleeve at the blade root is as follows: the shearing of the outer surface of the embedded bolt sleeve of the concave section and a glass fiber bonding surface, the shearing of the outer surface of the embedded bolt sleeve of the convex section and the glass fiber bonding surface and the shearing of a glass fiber layer at the groove shoulder position of the concave section are carried out, and the shearing strength of a bonding interface of the embedded bolt sleeve and the glass fiber is relatively small, so that the condition of insufficient drawing limit endurance can be generated. Based on the above, according to the embedded bolt sleeve provided by the invention, the outer surface of the embedded bolt sleeve is processed into at least two grooves which are different in depth and distributed in a staggered manner, that is, the existing corrugated concave-convex arrangement is optimized, and the surface of the convex section is further provided with the shallow groove, so that the shearing state of the combined section of the embedded bolt sleeve and the glass fiber after the embedded bolt sleeve is pulled out is converted into the glass fiber interlayer shearing of the cylindrical envelope area of the outer surface of the shallow groove. Because the shear strength of the combination interface of the embedded bolt sleeve and the glass fibers is less than the shear strength between glass fiber layers, the drawing limit endurance of the embedded bolt sleeve at the root of the blade can be effectively improved by adding the shallow groove characteristic.
The invention is further elucidated with reference to the drawings in conjunction with the detailed description. Fig. 1 and 2 respectively show a structure and a cross-sectional view of a buried bolt sleeve according to an embodiment of the present invention. As shown, a buried bolt sleeve includes a sleeve, wherein a plurality of groove sections having two or more depths are provided at an outer surface of the sleeve at intervals from each other in an axial direction of the sleeve. As shown in the figure, any two adjacent groove regions respectively include a deep groove region and a shallow groove region, the deep groove regions can be numbered 1011, 1012, …, 101i, … and 101m in sequence from the bottom surface of the embedded bolt sleeve along the axial direction, and the shallow groove regions can be numbered 1021, 1022, …, 102i, … and 102n in sequence. Wherein m and n are the number of deep trench regions and shallow trench regions on the outer surface of the sleeve respectively. In the embodiment of the present invention, the values of m and n are equal or differ by 1.
Fig. 3 shows a schematic view of two adjacent groove regions of a fastener sleeve according to an embodiment of the invention. As shown in fig. 3, the deep trench region 101i includes a first trench, and the shallow trench region 102i includes a plurality of second trenches, wherein the depth of the first trench is greater than that of the second trenches.
In the embodiments of the present invention, the lengths of the deep trench region and the shallow trench region are not limited. Specifically, in the embodiment of the present invention, the lengths of the respective deep trench regions may be the same or different, for example, the lengths of the deep trench regions 1011, 1012, …, 101i, …, and 101m may sequentially increase or decrease, or change in disorder. Similarly, the lengths of the shallow trench regions may be the same or different, for example, the lengths of the shallow trench regions 1021, 1022, …, 102i, …, 102n may be sequentially increased or decreased, or randomly changed. In addition, in the embodiment of the present invention, the lengths of the deep trench region 101i and the shallow trench region 102i may be the same or different.
In order to provide good shear strength, in one embodiment of the present invention, the trench depth H is set for the deep trench region 101i and the shallow trench region 102i i And h i Certain limitations are imposed. Specifically, the trench depth of the deep trench region 101i is set to not less than 1mm, and the trench depth of the shallow trench region 102i is set to not less than 0.5 mm. However, in embodiments of the present invention, the trench depths of the different deep trench regions or shallow trench regions may be the same or different. For example, in one embodiment of the present invention, the trench depths of the deep trench regions 1011, 1012, …, 101i, …, 101m are all equal: h 1 ＝H 2 ＝…＝H i ＝…＝H m . In other embodiments of the present invention, the trench depths of the deep trench regions 1011, 1012, …, 101i, …, 101m are not all equal, for example, the trench depths H of the deep trench regions 1011, 1012, …, 101i, …, 101m 1 、H 2 、…、H i 、…、H m The relationship of increasing or decreasing in sequence can be adopted, and the change can be disordered. Similarly, the trench depths of different shallow trench regions may be the same or different. For example, in one embodiment of the present invention, the trench depths of the shallow trench regions 1021, 1022, …, 102i, …, 102n are all equal: h is 1 ＝h 2 ＝…＝h i ＝…＝h m . In other embodiments of the present invention, the trench depths of the shallow trench regions 1021, 1022, …, 102i, …, 102n are not completely equal, for example, the trench depths h of the shallow trench regions 1021, 1022, …, 102i, …, 102n 1 、h 2 、…、h i 、…、h m The relationship of increasing or decreasing in sequence can be adopted, and the change can be disordered. That is, as long as H is satisfied i ≥1mm，h i Not less than 0.5mm and H i ＞h i And (4) finishing.
In order to further improve the shear strength, in an embodiment of the present invention, a chamfer is provided between any adjacent first trench and second trench, and a chamfer is also provided between each second trench of the same shallow trench region.
FIG. 4a is a schematic view of a bolt bushing used to connect the root of a blade according to an embodiment of the present invention; and FIG. 4b is an enlarged partial view of the structure within the dashed box of FIG. 4 a. As shown in the figure, the embedded bolt sleeve 100 is embedded in the root of the blade 200, a first end of the blade root bolt 201 is fixed inside the embedded bolt sleeve through inner wall threads, a second end of the blade root bolt extends out of the blade through a supporting part of the embedded bolt sleeve and further passes through the mounting hole of the variable-pitch bearing 202, and finally the blade root bolt is fixed to the inner ring of the variable-pitch bearing through an inner ring nut 221 of the variable-pitch bearing, so that the end surface of the blade root is attached to the inner ring of the variable-pitch bearing. In an embodiment of the invention, a root flange 203 may also be provided between the blade and the pitch bearing.
Fig. 5 shows a wind turbine having a blade root with an embedded bolt sleeve as described above according to an embodiment of the present invention. The embedded bolt sleeve is embedded into the root of the blade in an embedded mode. Specifically, in the manufacturing process of the blade root, glass fiber yarns are wound outside the embedded bolt sleeve, the outer surface of each yarn is parallel and level to the outer surface of the embedded bolt sleeve in a small enveloping cylinder, and then the yarn and the outer surface of the embedded bolt sleeve are placed into a layer of the blade root and integrally molded with other glass fiber material perfusion resins of the blade root. And in the installation process of the blade, a blade root bolt is screwed into the embedded bolt sleeve, so that the end surface of the blade root of the blade is tightly combined with the inner ring of the variable pitch bearing.
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (11)
1. A pre-buried bolt sleeve comprising a sleeve, wherein a plurality of groove sections are provided at an outer surface of the sleeve at intervals from each other in an axial direction of the sleeve, the plurality of groove sections having two or more depths.
2. The fastener stud sleeve of claim 1, wherein any two adjacent groove regions include a deep groove region and a shallow groove region, wherein the deep groove region includes a first groove and the shallow groove region includes a plurality of second grooves, and wherein the depth of the first groove is greater than the depth of the second groove.
3. The sleeve of claim 2, wherein the depth of any two of said deep grooves is the same and is not less than 1 mm.
4. The sleeve of claim 2, wherein the depth of any two of said deep grooves is different, but the depth of any deep groove is no less than 1 mm.
5. The sleeve of claim 4, wherein the groove depth of said deep groove section increases or decreases in sequence in the axial direction.
6. The embedded bolt sleeve as claimed in claim 2, wherein the depth of the grooves in any two shallow groove regions is the same, and the depth of the grooves is not less than 0.5 mm.
7. The embedded bolt sleeve as claimed in claim 2, wherein the depth of the grooves in any two shallow groove regions is different, but the depth of the grooves in any shallow groove region is not less than 0.5 mm.
8. The fastener stud sleeve of claim 7, wherein the groove depth of the shallow groove region increases or decreases in the axial direction.
9. The fastener stud sleeve of claim 2, wherein any two deep groove regions, and/or any two shallow groove regions, are the same or different length.
10. The embedded bolt sleeve as claimed in claim 2, wherein a chamfer is provided between any adjacent first groove and second groove, and/or second groove.
11. A wind turbine generator comprising a blade, wherein a blade root of the blade comprises the embedded bolt sleeve according to any one of claims 1 to 10, the embedded bolt sleeve is configured to fix a first end of a blade root bolt, and a second end of the blade root bolt is fixed to an inner ring of a pitch bearing through an inner ring nut of the pitch bearing, so that an end surface of the blade root is attached to the inner ring of the pitch bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210920730.8A CN115111249A (en) | 2022-08-02 | 2022-08-02 | Embedded bolt sleeve and wind driven generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210920730.8A CN115111249A (en) | 2022-08-02 | 2022-08-02 | Embedded bolt sleeve and wind driven generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115111249A true CN115111249A (en) | 2022-09-27 |
Family
ID=83334040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210920730.8A Pending CN115111249A (en) | 2022-08-02 | 2022-08-02 | Embedded bolt sleeve and wind driven generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115111249A (en) |
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| CN114770984A (en) * | 2022-06-17 | 2022-07-22 | 北京航空航天大学宁波创新研究院 | Bolt sleeve for connecting wind power blade root and embedded strength improving method thereof |
-
2022
- 2022-08-02 CN CN202210920730.8A patent/CN115111249A/en active Pending
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