CN116006394A - Blade root embedded part and fan blade root connection structure - Google Patents
Blade root embedded part and fan blade root connection structure Download PDFInfo
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- CN116006394A CN116006394A CN202310029559.6A CN202310029559A CN116006394A CN 116006394 A CN116006394 A CN 116006394A CN 202310029559 A CN202310029559 A CN 202310029559A CN 116006394 A CN116006394 A CN 116006394A
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- blade root
- embedded part
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- bosses
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- 239000000835 fiber Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 6
- 238000010008 shearing Methods 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
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Abstract
The invention relates to a blade root embedded part, which comprises an embedded part main body (1021) and a plurality of bosses (1022) arranged along the outer surface of the embedded part main body (1021), wherein the bosses (1022) are axially arranged at intervals along the embedded part main body (1021), and a through hole (1023) for bolting is arranged in the center of the bosses. Compared with the prior art, the blade root embedded part designed by the invention is provided with a plurality of bosses for connecting shear bolts along the axial direction of the main body at intervals, and the blade root connection design in a tensile form is changed into a shear-resistant form by utilizing the embedded part. Because the pretightening force of the shear bolt generates pressure between the blade root and the variable-pitch bearing, the friction force between the blade root and the variable-pitch bearing is increased, and the friction force can resist the shearing force of a part of blade bending moment on the joint surface of the blade root and the variable-pitch bearing inner ring, so that the strength of blade root connection can be improved.
Description
Technical Field
The invention relates to the technical field of wind driven generators, in particular to a blade root embedded part and a fan blade root connecting structure.
Background
A wind power generator is a device that converts wind energy into mechanical energy and then into electrical energy. Which comprises a tower, a nacelle connected to the tower and supporting a hub. The hub is provided with a plurality of fan blades, wherein the fan blades drive a rotor arranged in the hub to rotate around an axis under the action of wind force, and the rotation of the rotor of the generator relative to the stator generates electric energy. There are generally two ways of connecting the wind blade root to the pitch bearing: t-shaped punching and embedded blade root bolt sleeve type. Along with the increase of blade length, the megawatt level of wind generating set improves, and blade load also constantly increases, and more blades transition from traditional T type connection mode that punches to pre-buried blade root bolt cover connected mode to arrange more connecting bolts at the blade root, in order to guarantee that blade root connecting bolt has sufficient ultimate strength and fatigue strength.
The wind-powered electricity generation blade root pre-buried structure of design among the prior art is mostly the blade root connection structure of tensile form, has following shortcoming:
(1) In order to facilitate polishing of a high-speed metal polisher, the embedded bolt sleeve of the blade root generally protrudes out of the end face of the blade root composite material; because the composite material is solidified and contracted, after the blades are assembled, the end faces of the blade root embedded bolt sleeves at the positions of the common die joint are obviously and commonly lower than the end faces of the bolt sleeves at other positions, and the larger the pitch circle of the blades, the larger the contraction of the positions of the die joint is. In order to ensure the flatness of the end face of the blade root embedded bolt sleeve, when the end face is polished, the end face of the blade root embedded bolt sleeve near the die joint is not polished, and the end faces of the blade root embedded bolt sleeves at other positions are polished to be level with the blade root composite material; when the high-speed metal polisher touches the composite material, the high-speed friction generates heat, and the composite material is easy to burn, so that the mechanical property of the composite material is poor.
(2) The area of the end face of the embedded bolt sleeve of the blade root is smaller, and when the embedded bolt sleeve contacts with the end face of the flange, the rigidity of a connected piece is smaller, and the fatigue life of the connecting bolt is reduced.
(3) In the traditional blade root embedded connection structure, only the bolt sleeve, the flange and the variable pitch bearing are pressed components, the blade root composite material is not compressed, the stiffness of the connected component is not contributed, and the maximum drawing force of the embedded bolt sleeve and the fatigue resistance of the connecting bolt are reduced.
The three defects cause that the process of the embedded blade is difficult to control during production, meanwhile, the fatigue life of the blade root bolt is short during the on-hook operation process, the blade root bolt is broken frequently, and the reliability and the service life of the wind power blade are reduced.
Disclosure of Invention
The invention aims to overcome at least one of the defects in the prior art and provide a blade root embedded part and fan blade root connecting structure. The embedded parts of the blade root are distributed along the circumferential direction of the blade root, when the blade is loaded, the blade bending moment can lead the single side of the blade root to be pulled or pressed, and the shear bolts bear and resist the contact surface shearing force between the blade root and the variable-pitch bearing, thereby realizing the connection function of the blade root and the variable-pitch bearing. Because the pretightening force of the shear bolt generates pressure between the blade root and the variable-pitch bearing, the friction force between the blade root and the variable-pitch bearing is increased, and the friction force can resist the shearing force of a part of blade bending moment on the joint surface of the blade root and the variable-pitch bearing inner ring, so that the strength of blade root connection can be improved.
The aim of the invention can be achieved by the following technical scheme:
the invention aims at providing a blade root embedded part, which comprises an embedded part main body and a plurality of bosses arranged along the outer surface of the embedded part main body, wherein the bosses are axially arranged at intervals along the embedded part main body, and a through hole for bolting is arranged in the center of the boss. The diameter of the boss is larger than or equal to that of the embedded part main body, and threads matched with the shear bolts are arranged on the inner wall of the through hole.
Further, the cross section of the embedded part main body comprises any one of a circle, a rectangle or an ellipse, and is preferably a circle.
Further, the outer surface of the embedded part main body is provided with a thread groove or a rotary groove for winding fiber yarns. The fiber yarn is wound on the embedded part main body, so that the bonding strength of the embedded part and the fiber material of the blade root can be improved.
Further, the height of the top surface of the boss in the axial direction of the through hole from the outer surface of the embedded part main body is more than or equal to 0.
Further, the height of the bottom surface of the boss along the axial direction of the through hole from the outer surface of the embedded part main body is more than or equal to 0.
Further, the cross section of the boss along the axial direction of the through hole is concentric circles.
Further, the interval between the adjacent bosses is smaller than the diameter of one boss.
Further, the number of the bosses is at least 1, preferably 2.
The second purpose of the invention is to provide a fan blade root connecting structure, which comprises a blade root, shear bolts, a variable pitch bearing and the blade root embedded part; the blade root embedded part is embedded to the bottom of the blade root, and the variable pitch bearing is connected with the blade root through a shear bolt penetrating through the blade root embedded part.
Further, in order to improve the self strength of the blade root, at least 4 blade root embedded parts are embedded to the bottom of the blade root, and the blade root embedded parts are uniformly distributed along the circumferential direction of the blade root.
Compared with the prior art, the blade root embedded part designed by the invention is provided with a plurality of bosses for connecting shear bolts along the axial direction of the main body at intervals, and the blade root connection design in a tensile form is changed into a shear-resistant form by utilizing the embedded part. Because the pretightening force of the shear bolt generates pressure between the blade root and the variable-pitch bearing, the friction force between the blade root and the variable-pitch bearing is increased, and the friction force can resist the shearing force of a part of blade bending moment on the joint surface of the blade root and the variable-pitch bearing inner ring, so that the strength of blade root connection can be improved.
Drawings
Fig. 1 is a front view (a) and a cross-sectional view (b) of a root embedment in embodiment 1;
FIG. 2 is a schematic view of a blade root connection structure of embodiment 1;
FIG. 3 is a schematic view of a blade root connection structure of embodiment 2;
the reference numerals in the figures indicate: 101-blade root; 102-blade root embedded parts; 1021-embedded part main body; 1022-boss; 1023-through holes; 103-shear bolts; 104-a pitch bearing; 105-hub.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are provided, but the protection scope of the present invention is not limited to the following embodiments.
Example 1
Fig. 1 shows a front view (a) and a section view (b) of a blade root embedment. As shown in fig. 1, a blade root embedded part 102 includes an embedded part main body 1021 and a plurality of bosses 1022 arranged along the outer surface of the embedded part main body 1021, wherein the bosses 1022 are axially arranged at intervals along the embedded part main body 1021, and a through hole 1023 for bolting is arranged in the center of the boss.
The cross section of the embedment body 1021 includes any one of a circle, a rectangle, or an ellipse. The outer surface of the embedded part main body 1021 is provided with a thread groove or a rotary groove for winding fiber yarns. The height of the top surface of the boss 1022 along the axial direction of the through hole 1023 from the outer surface of the embedded part main body 1021 is greater than 0. The height of the bottom surface of the boss 1022 along the axial direction of the through hole 1023 from the outer surface of the embedded part main body 1021 is greater than 0. The cross section of the boss 1022 along the axial direction of the through hole 1023 is concentric circular. The spacing between adjacent bosses 1022 is less than the diameter of one boss 1022. The number of bosses 1022 is at least 1.
Fig. 2 is a schematic view of a fan blade root connection structure. As shown in fig. 2, a fan blade root connection structure includes a blade root 101, a shear bolt 103, a pitch bearing 104, and a blade root embedded part 102. The blade root 101 is provided with the blade root embedded parts 102, at least 4 blade root embedded parts 102 are uniformly distributed along the circumferential direction of the blade root 101, and are embedded into the bottom of the blade root 101. More specifically, in the manufacturing process of the blade root of the blade, glass fiber yarns are wound on the outer surface of the embedded part 102 of the blade root, the outer surface of the yarns is flush with the outer surface of the embedded part 102 of the blade root in a small-enveloping cylinder, and then the yarns are placed in the paving layer of the blade root and are integrally molded with other glass fiber materials of the blade root by pouring resin. In the process of installing the blade, the shear bolts 103 are screwed into the blade root embedded parts 102, so that the end surfaces of the blade roots 101 are tightly combined with the inner rings of the pitch bearings 104. The hub 105 and the pitch bearing 104 are connected in a matched manner through bolts.
Compared with the existing blade root connecting structure designed in a tension mode, the blade root bolt is designed to be in a shear mode, embedded parts are added to the blade root for improving the self strength of the blade root, and the embedded parts are distributed along the circumferential direction of the blade root. When the blade is loaded, the bending moment of the blade can lead the single side of the blade root to be pulled or pressed, and the shear bolt can bear and resist the contact surface shearing force of the blade root and the pitch bearing, thereby realizing the connection function of the blade root and the pitch bearing. Because the pretightening force of the shear bolt generates pressure between the blade root and the variable-pitch bearing, the friction force between the blade root and the variable-pitch bearing is increased, and the friction force can resist the shearing force of a part of blade bending moment on the joint surface of the blade root and the variable-pitch bearing inner ring, so that the strength of blade root connection can be improved.
Example 2
The structure of the embedded part of the blade root in embodiment 2 is basically the same as that of the embedded part of the blade root in embodiment 1, except that in embodiment 2, the height of the top surface of the boss 1022 along the axial direction of the through hole 1023 from the outer surface of the embedded part main body 1021 is equal to 0. The height of the bottom surface of the boss 1022 along the axial direction of the through hole 1023 from the outer surface of the embedded part main body 1021 is equal to 0.
Fig. 3 is a schematic view of a fan blade root connection structure. The blade root embedment 102 in this fan blade root connection configuration uses the configuration described above.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A blade root embedded part is characterized in that the blade root embedded part (102) comprises an embedded part main body (1021) and a plurality of bosses (1022) arranged along the outer surface of the embedded part main body (1021),
the bosses (1022) are axially arranged at intervals along the embedded part main body (1021), and through holes (1023) for bolt connection are formed in the centers of the bosses.
2. The blade root embedment of claim 1, wherein the embedment body (1021) cross-section includes any one of circular, rectangular, or elliptical.
3. The embedded part of the blade root according to claim 1, wherein the external surface of the embedded part main body (1021) is provided with a thread groove or a rotary groove for winding fiber filaments.
4. The embedded part of the blade root according to claim 1, wherein the height of the top surface of the boss (1022) along the axial direction of the through hole (1023) from the outer surface of the embedded part main body (1021) is greater than or equal to 0.
5. The embedded part of claim 4, wherein the height of the bottom surface of the boss (1022) along the axial direction of the through hole (1023) from the outer surface of the embedded part main body (1021) is greater than or equal to 0.
6. A blade root embedment according to claim 1, characterized in that the cross section of the boss (1022) along the axial direction of the through hole (1023) is concentric circular.
7. A blade root embedment as defined in claim 1, wherein the spacing between adjacent bosses (1022) is less than the diameter of one boss (1022).
8. The blade root embedment of claim 1, wherein the number of bosses (1022) is at least 1.
9. A fan blade root connection structure, characterized by comprising a blade root (101), a shear bolt (103), a pitch bearing (104) and a blade root embedment (102) according to any of claims 1-8;
the blade root embedded part (102) is embedded to the bottom of the blade root (101), and the variable-pitch bearing (104) is connected with the blade root (101) through a shear bolt (103) penetrating through the blade root embedded part (102).
10. The embedded blade root part according to claim 9, wherein the number of embedded blade root parts (102) is at least 4, and the embedded blade root parts (102) are uniformly distributed along the circumference of the blade root (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310029559.6A CN116006394A (en) | 2023-01-09 | 2023-01-09 | Blade root embedded part and fan blade root connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310029559.6A CN116006394A (en) | 2023-01-09 | 2023-01-09 | Blade root embedded part and fan blade root connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116006394A true CN116006394A (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310029559.6A Pending CN116006394A (en) | 2023-01-09 | 2023-01-09 | Blade root embedded part and fan blade root connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116006394A (en) |
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2023
- 2023-01-09 CN CN202310029559.6A patent/CN116006394A/en active Pending
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