Wind power blade and refitting process thereof
阅读说明：本技术 风电叶片及其改装工艺 (Wind power blade and refitting process thereof ) 是由 兰连军 胡雪琛 皮富强 金德智 章建康 郑海 林建平 项灵文 王超 刘恒 郑建飞 于 2020-12-09 设计创作，主要内容包括：本发明涉及风电发电技术领域,尤其涉及一种风电叶片及及其改装工艺。该风电叶片靠近其叶尖部位设置有排水孔,排水孔设置于风电叶片的吸力面,且与风电叶片的内腔连通；排水孔距离叶尖部位的尖部为a＝k-1*L,距离叶尖部位的后缘为b＝k-2*L；L为风电叶片的长度。该风电叶片能够明显减小或消除哨声,及时排除安全隐患,提高了整个风电机组的运动可靠性。(The invention relates to the technical field of wind power generation, in particular to a wind power blade and a modification process thereof. The wind power blade is provided with a drain hole close to the blade tip, and the drain hole is arranged on the suction surface of the wind power blade and communicated with the inner cavity of the wind power blade; the tip of the drainage hole from the tip part is a ═ k 1 L, and b ═ k from the rear edge of the tip part 2 L; and L is the length of the wind power blade. The wind power blade can obviously reduce or eliminate whistle, timely eliminates potential safety hazards, and improves the motion reliability of the whole wind turbine generator.)
1. A wind power blade is characterized in that a drain hole is formed in the position, close to the blade tip, of the wind power blade, and the drain hole is formed in the suction surface of the wind power blade and communicated with the inner cavity of the wind power blade;
the tip of the drainage hole from the tip part is a ═ k1L, and the deviation is ± 10 mm, the unit of a is mm;
the above-mentionedThe rear edge of the water drainage hole from the tip part is k2L, and the deviation is ± 5 mm, the unit of b is mm;
wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3Are the corresponding dimensionless scaling factors;
m0＝13.3，n02.22, which is a dimensionless basis coefficient;
L045 meters, base length; and L is the actual length of the wind power blade, and the unit is meter.
2. The wind power blade according to claim 1, wherein an axis of the drain hole is obliquely arranged relative to the suction surface, an included angle β between the axis of the drain hole and the suction surface is 25 ° to 35 °, and an included angle γ between the axis of the drain hole and the axis of the wind power blade is 35 ° to 45 °; the drain hole is gradually close to the rear edge of the blade tip part from outside to inside and gradually far away from the axis of the wind power blade.
3. The wind blade as set forth in claim 2, wherein the inner bore wall of the drainage hole is coated with a finish.
4. The utility model provides a repacking technology of wind-powered electricity generation blade which characterized in that for repacking the original wash port of wind-powered electricity generation blade, the repacking step includes:
polishing a preset area on the periphery of the original drain hole: spreading a preset area around the original drain hole by taking the original drain hole as a center, polishing the coating on the surface of the shell in the preset area completely, and cleaning;
determining the position of a new drainage hole and punching: determining the position of the new drainage hole at the tip part of the suction surface of the wind power blade, wherein the tip part of the new drainage hole away from the tip part is a (k)1L, and the deviation is ± 10 mm, the unit of a is mm; the new drain hole is positioned at a distance from the blade tipTrailing edge of b-k2L, and the deviation is ± 5 mm, the unit of b is mm; wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3Are the corresponding dimensionless scaling factors; m is0＝13.3，n02.22, which is a dimensionless basis coefficient; l is045 meters, base length; l is the actual length of the wind power blade, and the unit is meter; drilling holes at the positions of the new drainage holes until the holes are communicated with the inner cavity of the wind power blade;
plugging the original drain hole: firstly, cleaning the paint on the inner side wall of the original drain hole, ensuring that the inner side wall of the original drain hole is a pitted surface, plugging the original drain hole by using structural adhesive, pasting a layer of triaxial cloth by taking the original drain hole as a center, covering demoulding cloth on the triaxial cloth, and curing;
painting a predetermined area: painting the predetermined area to make the predetermined area consistent with other areas of the wind turbine blade.
5. The retrofitting process according to claim 4, wherein said new drain hole location is located in said predetermined area.
6. The refitting process according to claim 4, wherein in the step of determining the position of the new drain hole and punching, during the punching process, the axis of the new drain hole is ensured to be obliquely arranged relative to the suction surface, the included angle β between the axis of the new drain hole and the suction surface is 30 ° ± 5 °, and the included angle γ between the axis of the new drain hole and the axis of the wind power blade is 40 ° ± 55 °; the new drain hole is gradually close to the rear edge of the blade tip part from outside to inside and gradually far away from the axis of the wind power blade.
7. The retrofitting process according to claim 6, wherein in said step of locating and perforating a new drain hole, after said new drain hole is perforated, a finish is applied to the inner wall of said new drain hole.
8. The retrofitting process of any one of claims 4 to 6 wherein said triaxial fabric is selected to be a 1200 g/square meter triaxial fabric of 100mm x 100mm in said step of plugging an existing drain hole.
9. The retrofitting process of claim 8 wherein said triaxial fabric has a pitted outer surface that is flat, wrinkle free and bubble free.
10. The retrofitting process according to claim 9, wherein in said step of painting a predetermined area, it comprises the steps of:
puttying, namely puttying in the preset area to be smooth, curing and polishing;
brushing primer, namely brushing primer on the preset area after the putty is scraped on the preset area, and curing;
brushing finish paint, brushing finish paint on the preset area after brushing the primer on the preset area, and curing;
and brushing aerial mark paint, and brushing transverse empty mark paint on the preset area after finishing brushing the finish paint on the preset area.
Technical Field
The invention relates to the technical field of wind power generation, in particular to a wind power blade and a modification process thereof.
Background
The whistle sound exists when the apex of wind generating set leads to the operation because of the wash port, and this can influence the operating personnel to the judgement of unit health status, and unnecessary shut down inspection can influence the power generation benefit of wind-powered electricity generation field to a certain extent. Meanwhile, after the water drainage device runs for a long time, the thought of operators is easy to be paralyzed, whistle caused by other defects such as cracking of the blade tip is easy to be considered as a water drainage hole, and huge potential safety hazards can be buried.
Disclosure of Invention
The invention provides a wind power blade and a modification process thereof, which aim to solve the technical problem of whistle at the blade tip of a wind generating set.
The invention provides a wind power blade, wherein a drain hole is formed in the position, close to the blade tip, of the wind power blade, and the drain hole is formed in the suction surface of the wind power blade and is communicated with the inner cavity of the wind power blade;
the tip of the drainage hole from the tip part is a ═ k1L, and b ═ k from the rear edge of the tip part2*L；
The tip of the drainage hole from the tip part is a ═ k1L, and the deviation is ± 10 mm, the unit of a is mm;
the rear edge of the drainage hole away from the blade tip is k2L, and the deviation is ± 5 mm, the unit of b is mm;
wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3Are the corresponding dimensionless scaling factors;
m0＝13.3，n02.22, which is a dimensionless basis coefficient;
L045 meters, base length; and L is the length of the wind power blade, and the unit is meter.
Furthermore, the axis of the drain hole is obliquely arranged relative to the suction surface, the included angle beta between the axis of the drain hole and the suction surface is 25-35 degrees, and the included angle gamma between the axis of the drain hole and the axis of the wind power blade is 35-45 degrees; the drain hole is gradually close to the rear edge of the blade tip part from outside to inside and gradually far away from the axis of the wind power blade.
Further, the inner hole wall of the drainage hole is coated with finish paint.
The invention also provides a modification process of the wind power blade, which is used for modifying the original drain hole of the wind power blade, and the modification steps comprise:
polishing a preset area on the periphery of the original drain hole: spreading a preset area around the original drain hole by taking the original drain hole as a center, polishing the coating on the surface of the shell in the preset area completely, and cleaning;
determining the position of a new drainage hole and punching: determining the position of the new drainage hole at the tip part of the suction surface of the wind power blade, wherein the tip part of the new drainage hole away from the tip part is a (k)1L, and the deviation is ± 10 mm, the unit of a is mm; the position of the new drain hole is b-k away from the rear edge of the blade tip part2L, and the deviation is ± 5 mm, the unit of b is mm; wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3Is correspondingly absentThe scale factor of the dimension; m is0＝13.3，n02.22, which is a dimensionless basis coefficient; l is045 meters, base length; l is the actual length of the wind power blade, and the unit is meter; drilling holes at the positions of the new drainage holes until the holes are communicated with the inner cavity of the wind power blade;
plugging the original drain hole: firstly, cleaning the paint on the inner side wall of the original drain hole, ensuring that the inner side wall of the original drain hole is a pitted surface, plugging the original drain hole by using structural adhesive, pasting a layer of triaxial cloth by taking the original drain hole as a center, covering demoulding cloth on the triaxial cloth, and curing;
painting a predetermined area: painting the predetermined area to make the predetermined area consistent with other areas of the wind turbine blade.
Further, the new drain hole position is located in the predetermined area.
Further, in the step of determining the position of the new drainage hole and punching, in the punching process, the axis of the new drainage hole is ensured to be obliquely arranged relative to the suction surface, an included angle β between the axis of the new drainage hole and the suction surface is 30 ° ± 5 °, and an included angle γ between the axis of the new drainage hole and the axis of the wind power blade is 40 ° ± 5 °; the new drain hole is gradually close to the rear edge of the blade tip part from outside to inside and gradually far away from the axis of the wind power blade.
Further, in the step of determining the position of the new drain hole and punching, after the new drain hole is punched, finishing paint is coated on the inner hole wall of the new drain hole.
Further, in the step of plugging the original drain holes, the triaxial cloth is 1200 g/square meter triaxial cloth with the thickness of 100mm × 100 mm.
Furthermore, the outer surface of the triaxial fabric is a pitted surface, and the triaxial fabric is flat, wrinkle-free and bubble-free.
Further, in the step of painting the predetermined area, the step of:
puttying, namely puttying in the preset area to be smooth, curing and polishing;
brushing primer, namely brushing primer on the preset area after the putty is scraped on the preset area, and curing;
brushing finish paint, brushing finish paint on the preset area after brushing the primer on the preset area, and curing;
and brushing aerial mark paint, and brushing transverse empty mark paint on the preset area after finishing brushing the finish paint on the preset area.
The wind power blade and the modification process thereof provided by the embodiment of the invention have the following beneficial effects:
in the wind power blade provided by the embodiment of the invention, the drain hole is arranged at the position of the preset drain hole, and the tip part of the preset drain hole, which is far away from the blade tip part, meets the empirical formula: a ═ k1L, the trailing edge from the tip location satisfies the empirical formula: k ═ b2L; wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3；m0＝13.3，n0＝2.22，L045 m; and L is the length of the wind power blade. The whistle can be obviously reduced or eliminated in the region, in the working process of the wind turbine blade, when the whistle is generated, the condition that the drain hole generates the whistle is eliminated, a worker can definitely generate other faults for the wind turbine blade, and the whistle is maintained in time, so that potential safety hazards are timely eliminated, and the motion reliability of the whole wind turbine generator is improved.
In the modification process of the wind power blade provided by the embodiment of the invention, the new drain hole is arranged at the position of the preset drain hole, and the tip part of the preset drain hole, which is far away from the blade tip part, meets the empirical formula: a ═ k1L, the trailing edge from the tip location satisfies the empirical formula: k ═ b2L; wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3；m0＝13.3，n0＝2.22，L045 m; and L is the length of the wind power blade. The whistle sound can be obviously reduced or eliminated in the area, and when the whistle is generated in the working process of the wind power bladeDuring sounding, the condition that the whistle sound is generated by the drain hole is eliminated, so that workers can definitely generate other faults for the wind power blade, timely maintain the wind power blade, eliminate potential safety hazards in time and improve the motion reliability of the whole wind power unit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of a tip portion of a wind turbine blade according to an embodiment of the present invention.
Description of reference numerals:
100-wind power blades; 110-drainage holes.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment provides a wind power blade, as shown in fig. 1, a drain hole 110 is formed in a position, close to a blade tip, of a wind power blade 100, and the drain hole 110 is arranged on a suction surface of the wind power blade 100 and is communicated with an inner cavity of the wind power blade 100;
the tip of the drainage hole from the tip part is a ═ k1L, and the deviation is ± 10 mm, the unit of a is mm; the rear edge of the water drainage hole from the tip part is k2L, and the deviation is ± 5 mm, the unit of b is mm;
wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3Are the corresponding dimensionless scaling factors; m is0＝13.3，n02.22, which is a dimensionless basis coefficient; it is to be noted thatL and L0In the two empirical formulas, the corresponding value of unit meter is calculated as a dimensionless number.
L045 meters, base length; and L is the length of the wind power blade and is measured in meters.
In the wind power blade provided by the embodiment of the invention, the drain hole is arranged at the position of the preset drain hole, and the tip part of the preset drain hole, which is far away from the blade tip part, meets the empirical formula: a ═ k1L, and the deviation is ± 10 mm; the position of the preset drain hole and the rear edge of the blade tip part meet the empirical formula: k ═ b2L, and the deviation is ± 5 mm; wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3；m0＝13.3，n0＝2.22，L045 m; and L is the length of the wind power blade. The whistle can be obviously reduced or eliminated in the region, in the working process of the wind turbine blade, when the whistle is generated, the condition that the drain hole generates the whistle is eliminated, a worker can definitely generate other faults for the wind turbine blade, and the whistle is maintained in time, so that potential safety hazards are timely eliminated, and the motion reliability of the whole wind turbine generator is improved.
In this embodiment, the axis of the drain hole is inclined with respect to the suction surface, an included angle β between the axis of the drain hole and the suction surface is 30 ° ± 5 °, and an included angle γ between the axis of the drain hole and the axis of the wind power blade is 40 ° ± 5 °; the drain hole is gradually close to the rear edge of the blade tip part from outside to inside and is gradually far away from the axis of the wind power blade. By the arrangement, the occurrence of whistle sound of the blade tip caused by the drain hole can be further eliminated or avoided.
In the embodiment, the inner hole wall of the drain hole is coated with finish paint, so that the corrosion of the outer periphery to the inner hole wall of the drain hole is prevented, and the drain hole is effectively protected.
The embodiment of the invention also provides a modification process of the wind power blade, which is used for modifying the original drain hole of the wind power blade, and the modification step comprises the following steps:
s202, grinding a preset area on the periphery of the original drain hole: taking the original drain hole as a center, diffusing a preset area around the original drain hole, polishing the coating on the surface of the shell in the preset area completely, and cleaning;
s204, determining the position of a new drainage hole and punching: determining a new drain hole position at the tip part of the suction surface of the wind power blade, wherein the tip part of the new drain hole position away from the tip part is a (k)1L, and the deviation is ± 10 mm, the unit of a is mm; the position of the new water drainage hole is b-k away from the rear edge of the blade tip part2L and deviations ± 5 mm, units of b being mm. Wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3For the corresponding dimensionless scaling factor, it should be noted that L and L0In the two empirical formulas, the corresponding value of unit meter is calculated as a dimensionless number. m is0＝13.3，n02.22, which is a dimensionless basis coefficient; l is045 meters, base length; l is the length of the wind power blade and the unit is meter; and drilling holes at the positions of the new drainage holes until the holes are communicated with the inner cavity of the wind power blade.
S206, plugging the original drain hole: firstly, cleaning paint on the inner side wall of an original drain hole, ensuring that the inner side wall of the original drain hole is a rough surface, plugging the original drain hole by using structural adhesive, pasting a layer of triaxial cloth by taking the original drain hole as a center, covering demoulding cloth on the triaxial cloth, and curing;
s208 painting the predetermined area: painting the predetermined area to make the predetermined area consistent with other areas of the wind turbine blade.
In the modification process of the wind power blade provided by the embodiment of the invention, the new drain hole is arranged at the position of the preset drain hole, and the tip part of the preset drain hole, which is far away from the blade tip part, meets the empirical formula: a ═ k1L, and the deviation is ± 10 mm; the position of the preset drain hole and the rear edge of the blade tip part meet the empirical formula: k ═ b2L, and the deviation is ± 5 mm; wherein k is1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3；m0＝13.3，n0＝2.22，L045 m; and L is the length of the wind power blade. The whistle can be obviously reduced or eliminated in the region, in the working process of the wind turbine blade, when the whistle is generated, the condition that the drain hole generates the whistle is eliminated, a worker can definitely generate other faults for the wind turbine blade, and the whistle is maintained in time, so that potential safety hazards are timely eliminated, and the motion reliability of the whole wind turbine generator is improved.
In this embodiment, the new drain hole is located in a predetermined area.
In this embodiment, in the step of determining the position of the new drainage hole and punching the hole in S204, in the punching process, it is ensured that the axis of the new drainage hole is obliquely arranged with respect to the suction surface, an included angle β between the axis of the new drainage hole and the suction surface is 25 ° to 35 °, and an included angle γ between the axis of the new drainage hole and the axis of the wind turbine blade is 35 ° to 45 °; the new drain hole is gradually close to the rear edge of the blade tip part from outside to inside and gradually far away from the axis of the wind power blade.
In this embodiment, in the step of determining the position of the new drainage hole and punching in S204, after the new drainage hole is punched, the inner hole wall of the new drainage hole is coated with the finish paint.
In this embodiment, in the step of plugging the original drain holes in S206, the triaxial fabric is 1200 g/square meter triaxial fabric of 100mm × 100 mm.
In this embodiment, in the step of plugging the original drainage hole in S206, the outer surface of the triaxial fabric is a rough surface, and is flat, wrinkle-free, and bubble-free.
In the present embodiment, the step of painting the predetermined area in S208 includes the steps of:
s302, putty coating, namely coating a smooth putty in a preset area, curing and polishing;
s304, priming, namely after putty is applied to the preset area, priming the preset area and curing;
s306, brushing finish paint on the preset area after brushing the primer on the preset area, and curing;
s308, brushing aerial mark paint, and brushing transverse empty mark paint on the preset area after finishing brushing the finish paint on the preset area.
Example one
Taking the length L of the wind power blade as an example, and taking the length L of the wind power blade as 45 m, according to an empirical formula, and taking the length a as k1*L，b＝k2*L；k1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3；m0＝13.3，n0＝2.22，L0If the distance between the position of the drainage hole and the tip a of the tip part is 45 meters, the value range of the drainage hole from the tip part a is as follows: a is 599 mm +/-5 mm, and the value range from the rear edge b is as follows: b is 100mm +/-5 mm.
An included angle beta between the axis of the drain hole and the suction surface is 30 degrees +/-5 degrees, and an included angle gamma between the axis of the drain hole and the axis of the wind power blade is 40 degrees +/-5 degrees;
in this embodiment, the position and the angle are respectively: 600 mm for a, 100mm for b, 29 ° for β, 38 ° for γ, as shown in the table below.
Example two
Taking the length L of the wind power blade as 55 m as an example, according to an empirical formula a k1*L，b＝k2*L；k1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3；m0＝13.3，n0＝2.22，L0If the distance between the position of the drainage hole and the tip a of the tip part is 45 meters, the value range of the drainage hole from the tip part a is as follows: a is 701 mm +/-5 mm, and the value range from the rear edge b is as follows: b is 117 mm ± 5 mm.
An included angle beta between the axis of the drain hole and the suction surface is 30 degrees +/-5 degrees, and an included angle gamma between the axis of the drain hole and the axis of the wind power blade is 40 degrees +/-5 degrees;
in this embodiment, the position and the angle are respectively: a is 700 mm, b is 120 mm, β is 30 °, γ is 40 °, and the specific values are shown in the following table.
EXAMPLE III
Taking the length L of the wind power blade as an example, 78 m, and k according to an empirical formula1*L，b＝k2*L；k1＝m0-(L-L0)*55*10-3，k2＝n0-(L-L0)*9*10-3；m0＝13.3，n0＝2.22，L0If the distance between the position of the drainage hole and the tip a of the tip part is 45 meters, the value range of the drainage hole from the tip part a is as follows: a is 895 mm +/-10 mm, and the value range from the rear edge b is as follows: and b is 150 mm +/-5 mm.
An included angle beta between the axis of the drain hole and the suction surface is 30 degrees +/-5 degrees, and an included angle gamma between the axis of the drain hole and the axis of the wind power blade is 40 degrees +/-5 degrees;
in this embodiment, the position and the angle are respectively: a is 900 mm, b is 150 mm, β is 32 °, γ is 41 °, and is shown in the following table.
In the following table, taking three sizes of wind turbine blades as an example, the arrangement positions and angles of the drain holes are respectively:
in the existing wind power blade, when the position of the drain hole is not at the setting position determined by the empirical formula, the wind power blade is blown by a simulation environment test, the distance between the wind power blade and the drain hole is 10 meters, the whistle decibels are all over 80, and when the position of the modified drain hole is within the position range determined by the empirical formula, the whistle decibels are all lower than 15. Wind-powered electricity generation blade like each data carries out approximate environmental simulation before the equipment in above-mentioned table, blow the wind-powered electricity generation blade promptly, and measure apart from wind-powered electricity generation blade 10 meters distance, whistle average decibel value is 12.8 respectively, 11.5, 12.4, apex whistle has obviously been reduced, in the installation wind-powered electricity generation blade actual work process, because external environment's complexity, the whistle that is less than 15 decibels can be submerged by ambient noise, can ignore the influence of apex whistle this moment, when great decibel whistle appears, then can tentatively judge that the wind-powered electricity generation blade probably has broken down, in time remind the maintenance personal to carry out maintenance work.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the above embodiments, the descriptions of the orientations such as "up", "down", and the like are based on the drawings.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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