CN210738742U - Wind-powered electricity generation blade extension festival prevents weighing down structure - Google Patents
Wind-powered electricity generation blade extension festival prevents weighing down structure Download PDFInfo
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- CN210738742U CN210738742U CN201921157660.5U CN201921157660U CN210738742U CN 210738742 U CN210738742 U CN 210738742U CN 201921157660 U CN201921157660 U CN 201921157660U CN 210738742 U CN210738742 U CN 210738742U
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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
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- 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 utility model discloses a wind-powered electricity generation blade extension festival prevents weighing down structure adopts specific anti-falling scheme to include the prefabricated glass steel piece that bonds with former blade, is connected with extension festival web through preventing weighing down the rope. The prefabricated glass fiber reinforced plastic block is formed by vacuum infusion of glass fiber cloth and is fixed on the blade in a bonding or cloth pasting fixing mode. And manually pasting the reinforced glass fiber cloth near the end position of the extension section web. The strength of the application is better.
Description
Technical Field
The utility model belongs to the technical field of the wind-powered electricity generation blade, especially, relate to a wind-powered electricity generation blade extension festival prevents weighing down structure.
Background
The power of the wind driven generator is proportional to the second power of the length of the wind power blade, and in a low wind speed area, the blade is lengthened to be the most effective method for capturing more wind energy. The reliability of the connection between the extension joint and the original blade is one of the most important techniques for extending the blade. The extension joint is prevented falling and can be tensioned when the connection position fails, and the extension joint is prevented from falling before wind field personnel find problems. Different wind power blades and extension joint structures enable the anti-falling rope to bear different tensile forces, and the connecting position of the anti-falling rope, the original blade and the blade tip needs to meet certain strength requirements.
SUMMERY OF THE UTILITY MODEL
Based on the above object, the utility model provides a wind-powered electricity generation blade extension festival prevents weighing down structure.
In order to realize the purpose of the utility model, the utility model provides an anti-falling structure for the extension joint of the wind power blade, the original blade is connected with a prefabricated glass fiber reinforced plastic block in a bonding way, and the prefabricated glass fiber reinforced plastic block is connected with an extension joint web plate through an anti-falling rope; the connecting structure of the prefabricated glass fiber reinforced plastic block and the anti-falling rope is characterized in that through holes are punched in the centers of the prefabricated glass fiber reinforced plastic block in the width directions of 1/5 and 4/5 along the thickness direction of the length method, the diameter of each hole is not smaller than 10mm, or plastic pipes with the inner diameter of 10mm to 12mm and the outer diameter of 15mm to 20mm are pre-embedded in the width directions of 1/5 and 4/5 of the prefabricated glass fiber reinforced plastic block when the glass fiber reinforced plastic is prefabricated.
Wherein, the reinforced glass fiber cloth is hand pasted near the end position of the extension joint web.
The reinforced glass fiber cloth is adhered to the web plate in a hand pasting forming mode at the punching position of the long section web plate.
The prefabricated glass fiber reinforced plastic block is formed by vacuum infusion of 20-40 layers of glass fiber cloth, and has a length of 400-600 mm and a width of 200-400 mm.
The prefabricated glass fiber reinforced plastic block and the original blade are bonded in a reinforcing mode of structural adhesive or glass fiber cloth, and the thickness of the structural adhesive is 3mm to 5mm when the prefabricated glass fiber reinforced plastic block and the original blade are bonded by using the adhesive; when the glass fiber cloth and the glass fiber are used for reinforcing, the number of the reinforcing layers is 5 to 10.
Wherein, the anti-falling rope is made of a material with high tensile strength and certain corrosion resistance.
Wherein, the length of the anti-falling rope after connecting the original blade and the extension section is kept with a certain margin.
And establishing a local finite element model with the original blade and the connecting part of the extension section in a parameterization mode according to the geometric dimension and the layering number of the prefabricated glass fiber reinforced plastic block.
And applying complete constraint to one end of the local finite element model along the span direction, uniformly applying a design limit load in the middle of the punching position of the prefabricated glass fiber reinforced plastic block, and calculating to obtain the optimal solution of the geometric dimension and the layer number of the prefabricated glass fiber reinforced plastic block meeting the design requirement.
The web plate with the extension section is characterized in that a finite element model is built by adopting a parameterization method, complete constraint is applied to one spanwise end of the finite element model of the web plate, a design limit load is applied to the end head of the web plate according to the diameter size of the anti-falling rope, and the required optimal solution of the web plate reinforcing layer number is obtained through calculation.
Compared with the prior art, the beneficial effects of the utility model are that, this application includes the prefabricated glass steel piece that bonds with former blade, is connected with the extension festival web through preventing weighing down the rope, has improved the better connected mode of joint strength.
Drawings
Fig. 1 shows a schematic diagram of the method steps of the present application.
1-prefabricating a glass fiber reinforced plastic block, 2-extending joints, 3-original blades, 4-in the direction from the blade root to the blade tip, and 5-preventing falling ropes.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The anti-falling scheme comprises a prefabricated glass fiber reinforced plastic block bonded with an original blade, and is connected with an extension joint web plate through an anti-falling rope. The design method can efficiently obtain the optimal scheme through a finite element method according to different tensile forces borne by the anti-falling rope and the safety margin of technical requirements.
The application provides a structure of preventing falling of extension festival combines certain model blade extension festival, and the scheme schematic diagram of preventing falling is shown in figure 1.
Specifically, the prefabricated glass fiber reinforced plastic block 1 and the original blade 3 are bonded by structural adhesive, and the anti-falling rope penetrates through the prefabricated glass fiber reinforced plastic block to be connected with the web plate of the extension joint 2. Holes are formed in the web plate, and the anti-falling rope 5 penetrates through the holes to be connected.
Specifically, a local finite element of the connecting position of the original blade and the extension section is established. The prefabricated glass fiber reinforced plastic block and the structural adhesive adopt 8-node solid units and share nodes with the shell unit, and irrelevant positions such as the front edge and the rear edge can be omitted in the model under the condition that the structure of a concerned position (namely the prefabricated glass fiber reinforced plastic block) is accurate and complete.
Specifically, the ultimate tensile force borne by the anti-falling rope 5 is calculated, and the final ultimate load is obtained by considering the safety margin of the design requirement.
Specifically, under the load data provided by a certain type of extension project, the prefabricated glass fiber reinforced plastic block is designed to be vacuum-filled with 24 layers of biaxial 800 glass fiber cloth, the spanwise direction is 450mm, the chord direction is 270mm, the interlaminar shear stress is 17.51MPa and meets the allowable shear strength of 81.7MPa of the biaxial 800 glass fiber cloth, and the maximum tensile stress is 65.67MPa and meets the allowable tensile strength of 68MPa of the biaxial 800 glass fiber cloth (the allowable strength needs are divided by the safety factor of 2.204 according to GL standard).
Specifically, a web finite element model is established, complete constraint is applied to one end of the model, and limit load is uniformly applied to a node of the inner surface of a hole far away from the constraint direction.
Specifically, under the load data provided by a certain type of extension project, the web reinforced 12-layer biaxial 800 glass fiber cloth is designed to bear the maximum stress of 66.67MPa, and the allowable tensile strength of 68MPa of the biaxial 800 glass fiber cloth is met.
Specifically, prefabricated glass steel piece set up at the former blade of blade span direction and extension festival hookup location, the span length is 400mm to 600 mm. The chord-wise center position is aligned with the extension section web and has a length of 200mm to 400 mm. And the prefabricated glass fiber reinforced plastic block is formed by vacuum glue injection of 20-40 layers of glass fiber cloth. And (3) punching a through hole at the center of the thickness of the prefabricated glass fiber reinforced plastic block in the chord directions 1/5 and 4/5 along the span direction of the blade, wherein the diameter of the through hole is not less than 10mm, and in addition, a way of embedding a pipeline is provided, and plastic pipes with the inner diameter of 10mm to 12mm and the outer diameter of 15mm to 20mm are embedded when the glass fiber reinforced plastic is prefabricated.
Specifically, the prefabricated glass fiber reinforced plastic block and the original blade are bonded in a reinforcing mode of structural adhesive or glass fiber cloth, the structural adhesive is used for bonding, and the thickness of the structural adhesive is 3mm to 5 mm. The glass fiber reinforcement mode is used, and the number of the reinforcement layers is 5 to 10.
A finite element method is adopted to establish a blade local model, the span length of the model is not less than the connecting length of the original blade and the extension joint, the suction surface, the pressure surface and the web plate adopt 4-node shell units, and the prefabricated glass fiber reinforced plastic block adopts 8-node solid units. And completely endowing the actual layering condition of the blade to the shell unit, and defining the three-dimensional structure of the entity unit in a parameterization mode. The method comprises the steps of thinning solid unit grids (at least 3 rows of grids are defined in the thickness direction) between two holes where a prefabricated glass fiber reinforced plastic block is contacted with an anti-falling rope, calculating to obtain the ultimate tensile force borne by the anti-falling rope 5 under the condition that the original blade and an extension joint are connected and fail, obtaining the ultimate load according to the safety margin of the design requirement, completely restraining one end of a model along the direction of the blade, and uniformly applying the ultimate load to nodes at the position of the thinned grids. And extracting the stress of the main fiber direction of the glass fiber reinforced plastic block and the shear stress of the structural adhesive layer as a result, and analyzing the strength of the prefabricated glass fiber reinforced plastic block and the structural adhesive. And obtaining an optimal scheme capable of meeting the design requirement by adjusting the three-dimensional structure of the parameterized and defined prefabricated glass fiber reinforced plastic block. And (3) establishing a local solid unit model of the web of the extension section by adopting a finite element method, wherein the spanwise length of the web is not less than 500 mm. Parameterizing to define a three-dimensional structure of the web plate, laying the actual layer of the web plate to a solid unit model, and refining solid unit grids at the contact position of the web plate and the anti-falling rope (at least 5 rows of grids are defined in the thickness and the direction from the suction surface to the pressure surface). The web model is completely restrained along one end of the span direction of the blade, and a limit load is applied to the end of the web according to the diameter of the anti-falling rope. And obtaining the stress of the main fiber direction, analyzing the structural strength of the web plate, and obtaining an optimal scheme capable of meeting the design by adjusting the parameterized and defined three-dimensional structure of the web plate (increasing the glass fiber cloth reinforced layer).
And (3) checking the strength of the anti-falling rope and the prefabricated glass fiber reinforced plastic block under different load conditions by a finite element method to obtain the optimal design of the prefabricated glass fiber reinforced plastic block. In addition, the stress of the end position of the extension section web is simulated by a finite element method, and the local reinforcement design of the web is guided. The anti-falling scheme can tension the extension section when the connection position of the extension section and the original blade is failed, and ensures that the extension section cannot fall off before wind field personnel find problems. The prefabricated glass fiber reinforced plastic block is formed by vacuum infusion of glass fiber cloth and is fixed on the blade in a bonding or cloth pasting fixing mode. And manually pasting the reinforced glass fiber cloth near the end position of the extension section web. And analyzing the strength of the connecting position by a finite element method to obtain the geometric dimension and the layer number of the prefabricated glass fiber reinforced plastic blocks meeting the design strength requirement and the reinforcing layer number of the glass fiber cloth at the end position of the extension web plate.
It should be noted that, the strength design requirements, allowable strength of the structure:
in the formula: rKObtaining a material characteristic value for calculation;
γMathe local safety factor is defined as:
in the formula: gamma rayM0-1.35 fractional coefficients;
C1a1.35 aging effects;
C2a-1.1 temperature effect;
C3a—1.1vacuum suction injection molding, 1.2 manual wet laying molding;
C4a1.0 post-cure laminate, 1.1 non-post-cure laminate.
It should be noted that, the limit load, which is equal to the sum of the centrifugal force and the extension joint gravity at the rated rotation speed, may be expressed as:
P＝mg+r×rpm×11.18×10-6
in the formula: m-extension joint mass;
r-wind wheel radius;
rpm-rated speed of the fan.
It should be noted that the parameterization method is used for establishing the web finite element model, and the concrete parameterization method can be expressed as
layers＝a
thick_core＝b
thick_CF＝c
thick_strCF＝d
altitude＝e
length＝f
/prep7
local,11,,,,,，,-90
et,1,solid185,，,1
keyopt,1,8,1
block,-b/2,b/2,0,c,0,d
block,-b/2-c,-b/2,0,c,0,d
block,b/2,b/2+c,0,c,0,d
block,-b/2-c,b/2+c,0,c,d,d+layers*d。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. An anti-falling structure for an extension joint of a wind power blade is characterized in that an original blade is connected with a prefabricated glass fiber reinforced plastic block in an adhesive mode, and the prefabricated glass fiber reinforced plastic block is connected with an extension joint web plate through an anti-falling rope; the connecting structure of the prefabricated glass fiber reinforced plastic block and the anti-falling rope is characterized in that through holes are punched in the centers of the prefabricated glass fiber reinforced plastic block in the width directions of 1/5 and 4/5 along the thickness direction of the length method, the diameter of each hole is not smaller than 10mm, or plastic pipes with the inner diameter of 10mm to 12mm and the outer diameter of 15mm to 20mm are pre-embedded in the width directions of 1/5 and 4/5 of the prefabricated glass fiber reinforced plastic block when the glass fiber reinforced plastic is prefabricated.
2. The wind turbine blade extension joint anti-falling structure is characterized in that a reinforcing glass fiber cloth is hand pasted near the end position of the extension joint web.
3. The wind turbine blade extension joint anti-falling structure according to claim 2, wherein the reinforced glass fiber cloth is bonded with the web by hand pasting at the punching position of the web of the extension joint.
4. The wind power blade extension joint anti-falling structure as claimed in claim 1 or 2, wherein the prefabricated glass fiber reinforced plastic block is formed by 20 to 40 layers of glass fiber cloth through vacuum infusion, and has a length of 400mm to 600mm and a width of 200mm to 400 mm.
5. The wind power blade extension joint anti-falling structure according to claim 1 or 2, wherein the prefabricated glass fiber reinforced plastic block and the original blade are bonded by adopting a structural adhesive or glass fiber cloth reinforcement mode, and when the prefabricated glass fiber reinforced plastic block and the original blade are bonded by using an adhesive, the thickness of the structural adhesive is 3mm to 5 mm; when the glass fiber cloth and the glass fiber are used for reinforcing, the number of the reinforcing layers is 5 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921157660.5U CN210738742U (en) | 2019-07-23 | 2019-07-23 | Wind-powered electricity generation blade extension festival prevents weighing down structure |
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| CN201921157660.5U CN210738742U (en) | 2019-07-23 | 2019-07-23 | Wind-powered electricity generation blade extension festival prevents weighing down structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318957A (en) * | 2019-07-23 | 2019-10-11 | 中科国风科技有限公司 | A kind of wind electricity blade extension section anti-falling structure |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318957A (en) * | 2019-07-23 | 2019-10-11 | 中科国风科技有限公司 | A kind of wind electricity blade extension section anti-falling structure |
| CN110318957B (en) * | 2019-07-23 | 2024-07-23 | 中科国风科技有限公司 | Wind-powered electricity generation blade extension festival anti-falling structure |
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