CN212716981U - Megawatt wind power blade - Google Patents
Megawatt wind power blade Download PDFInfo
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- CN212716981U CN212716981U CN202021702630.0U CN202021702630U CN212716981U CN 212716981 U CN212716981 U CN 212716981U CN 202021702630 U CN202021702630 U CN 202021702630U CN 212716981 U CN212716981 U CN 212716981U
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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 utility model provides a megawatt level wind-powered electricity generation blade belongs to wind power equipment technical field, include: the top end of the blade body is provided with a mounting structure for connecting a blade tip; the blade tip is detachably connected to the top end of the blade body through the mounting structure, the blade tip is made of insulating materials, the thickness of the blade tip is 10 cm-40 cm, and the top end of the blade tip is in smooth transition; the utility model discloses a megawatt level wind-powered electricity generation blade does not set up the arrester on the top of apex, and the apex all adopts insulating material, does not contain any electrically conductive, semiconductive material in the inside of apex to the top design of apex is slick and sly transition, thereby improves the dielectric strength of apex, makes the apex climb the arc in-process at the lightning current, can not appear puncturing and the smooth phenomenon of dodging, and the feasibility and the reliability of the lightning protection of apex all obtain great improvement.
Description
Technical Field
The utility model relates to a wind power equipment technical field, concretely relates to megawatt level wind-powered electricity generation blade and equipment, manufacturing method and the manufacturing method of apex thereof.
Background
At present, the synergistic technology of megawatt wind generating set blades which are widely applied in the market comprises the following steps: pneumatic attachment technology and blade extension technology. Wherein, the blade extension technique comprises: blade root extension techniques and blade tip extension techniques. The blade tip prolonging and efficiency increasing technology is based on the traditional momentum phyllotactic theory, realizes the unit efficiency increase by increasing the wind sweeping area of the wind wheel, and has the characteristic of remarkable efficiency increasing benefit.
The scheme widely applied at present is to extend the existing blade and arrange a lightning protection system on the extended blade tip. Specifically, the aerodynamic profile of the existing blade is cut off from a position close to the blade tip (for example, about 2m from the blade tip), a new extended airfoil is added at the cut-off position, and the lightning protection system is arranged on the new airfoil.
However, as the blades are longer and longer, the absolute thickness of the blade tip airfoil is smaller and smaller, and the narrow space causes a great deal of design difficulty and construction difficulty of the existing lightning protection system, great difficulty and risk exist in the process of technical improvement construction. Therefore, the feasibility and the reliability of the conventional blade extension scheme have more problems and risks, the process improvement of the lightning protection system is only carried out based on the existing conditions, the lightning protection performance is lower, and lightning accidents are easy to occur in areas with complex thunderstorm environments.
Therefore, in order to solve the defects of the prior art, it is necessary to provide a reliable lightning protection for the blade extension technology, and to reduce the difficulty of blade extension to some extent.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the blade among the prior art when carrying out the apex extension, the relatively poor and lower defect of reliability of feasibility of the lightning protection of the apex that sets up to a megawatt level wind-powered electricity generation blade that lightning protection reliability is high is provided.
The utility model also provides an assembly method, manufacturing method and the manufacturing method of apex of megawatt level wind-powered electricity generation blade.
In order to solve the technical problem, the utility model provides a megawatt level wind-powered electricity generation blade, include:
the blade comprises a blade body, a blade body and a blade tail, wherein the blade body is provided with a front edge, a rear edge, a windward surface and a leeward surface;
the blade tip is detachably connected to the top end of the blade body through the mounting structure, the blade tip is made of insulating materials, a shell of the blade tip is an insulating skin made of insulating composite materials, the thickness of the blade tip is 10 cm-40 cm, the length of the blade tip is 0.2-5m, and the top end of the blade tip is in smooth transition.
Preferably, the blade tip is of a hollow structure.
Preferably, the interior of the blade tip is filled with an insulating liquid, an insulating solid or an insulating gas.
Preferably, the insulating gas includes: air, nitrogen or heptafluoroisobutyronitrile, the insulating liquid comprising: an insulating oil, the insulating solid comprising: adhesive glue, balsa wood, PET, silicone or insulating foam. Among them, PET is commonly called polyester resin. Is a polycondensate of terephthalic acid and ethylene glycol.
Preferably, a lightning receptor is arranged on the mounting structure of the blade body and electrically connected with a down conductor in the blade body.
Preferably, a lightning receptor is arranged on the blade body in a region close to the mounting structure for connecting the blade tip, and the lightning receptor is electrically connected with a down conductor in the blade body.
Preferably, the thickness of the blade tip is 20-40 cm.
Preferably, the length of the blade tip is 0.2-5 m.
Preferably, the lightning receptor has a cylindrical body adapted to protrude onto the blade body or the mounting structure, the cylindrical body being adapted to be inserted into the blade body and the mounting structure.
Preferably, the lightning receptor is made of a conductive material such as stainless steel, aluminum alloy, copper or copper alloy.
Preferably, the mounting structure includes: the slot sets up the root at the apex with inserting the post, insert the post setting at the tip of blade body, at this moment, it adopts insulating material, like glass steel to insert the post.
Preferably, the lightning receptor comprises a profiled structure for forming part of the mounting structure. The special-shaped structure is a slot connected to the end of the blade body. The mounting structure further includes: and the inserting column is arranged at the root of the blade tip.
Preferably, the mounting structure further includes: set up respectively on the blade body and set up the slot on the apex, still include: the two ends of the connecting strip are respectively inserted into the slot of the blade body and the slot of the blade tip, and at the moment, the part of the connecting strip, which at least extends into the blade tip, is made of an insulating material, such as glass fiber reinforced plastics.
The utility model also provides a manufacturing approach of apex in megawatt level wind-powered electricity generation blade in any one of above-mentioned scheme, including following step:
forming the blade tip with a hollow structure in the blade tip mould by adopting an insulating composite material;
the inside of the shell of the blade tip is filled with an insulating substance.
The utility model also provides an assembly method of megawatt level wind-powered electricity generation blade of any one of above-mentioned scheme, including following step:
providing a formed blade body and a blade tip;
arranging a bonding material at the joint surface of the blade tip and/or the mounting structure of the blade body;
the blade tips are adhered to the joint surface of the mounting structure of the blade body to be connected in a bonding mode;
and the joint of the blade tip and the mounting structure of the blade body is bonded and reinforced by wrapping an insulating material.
The utility model provides a manufacturing approach of megawatt level wind-powered electricity generation blade of any one of above-mentioned scheme still, its characterized in that includes following step:
combining and connecting molds for manufacturing the blade body and the blade tip together;
forming the blade tip by adopting an insulating composite material in the blade tip mould;
and forming the blade body in a blade mold, so that the blade body and the blade tip are formed into a whole in the mold.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a wind-powered electricity generation blade, have the apex of detachable connection on the top of blade body, the integral insulating sheet structure that is of apex, top at the apex does not set up arrester and downlead, and be smooth transition with the top design of apex, there is not the closed angle structure either, smooth transition can be understood as the transition from blade leading edge to trailing edge direction, also can be from the transition of windward side to leeward side direction, because the apex is very thin, and do not contain any electrically conductive in surface and the inside of apex, semiconductive material, therefore, the apex has sufficient dielectric strength, the apex climbs the arc in-process at the lightning current, breakdown and smooth phenomenon of dodging can not appear, the lightning protection's of apex feasibility and reliability all obtain great improvement.
2. The utility model provides a wind-powered electricity generation blade, the replacement section position absolute thickness of apex has good application between 20-40cm to the minimum can not be less than 10cm, according to IEC61400-24 new edition specification requirement, more toward the apex region, the probability that the blade suffered the thunderbolt damage is big more, to the lower (replacement section position absolute thickness is less than 40cm) lobate configuration of the replacement section position absolute thickness of apex, hardly prevent inside guide's production in the regional increase insulation of apex. Therefore, aiming at the situation, the lightning protection system is cancelled in the area with the great risk of lightning strike on the blade tip, the top end of the blade tip is designed into an arc shape, the whole blade tip is designed into an insulating structure without any conductive and semiconductive substances, so that the down-leading channel cannot be generated in the blade tip, the lightning current can be enabled to be swept from the surface of the blade to the lightning receptor on the blade body in a sweeping mode, and the internal breakdown condition cannot be generated.
3. The utility model provides a wind-powered electricity generation blade, the inside of apex can be hollow structure, arranges the insulating composite of sufficient intensity through the casing at the apex, makes the breakdown strength of insulating composite part be not less than 75KV to increase the surface insulation strength of apex, prevent that the blade can not appear drawing down the passageway at the in-process of sweeping, make the thunder current sweep to the arrester of blade body from the apex with the form of sweeping from the apex surface, and the inside breakdown condition can not appear.
In addition, the inside of the blade tip may be considered to be added with an insulating substance, which may be an insulating solid, an insulating liquid or an insulating gas, wherein the insulating solid includes: light insulating materials such as adhesive glue, balsa wood, PET, silica gel or insulating foam, insulating gas includes: heptafluoroisobutyronitrile, nitrogen and other inert gases, wherein the insulating liquid comprises: and (4) insulating oil. When the tip of the blade is filled with insulating gas or insulating liquid, the tip shell is a closed hollow structure, and when the tip of the blade is filled with insulating solid, the joint part of the tip shell and the blade body can be an open structure. By the means, the insulation strength of the blade tip can be increased, the condition that the leading-down channel cannot appear in the blade tip is improved, the lightning current is swept from the blade tip to the lightning receptor of the blade body in a sweeping mode from the surface of the blade tip, and the internal breakdown condition cannot occur.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic perspective view of an embodiment of a megawatt wind turbine blade according to the present invention.
Fig. 2 is a schematic diagram of a longitudinal sectional structure of a first mounting structure of a megawatt wind turbine blade according to the present invention.
Fig. 3 is a schematic diagram of a longitudinal sectional structure of a second mounting structure of a megawatt wind turbine blade according to the present invention.
Fig. 4 is a schematic diagram of a longitudinal sectional structure of a third mounting structure of a megawatt wind turbine blade according to the present invention.
Description of reference numerals:
1. a blade body; 11. a leading edge; 12. a trailing edge; 13. the windward side; 14. a leeward side;
2. a blade tip; 3. a lightning receptor; 4. inserting a column; 5. a slot; 6. a connecting strip; 7. and guiding the down wire.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a specific implementation of a megawatt wind turbine blade, as shown in fig. 1, including: a blade body 1 and a detachable blade tip 2, the blade body having: the blade comprises a front edge 11, a rear edge 12, a windward side 13 and a leeward side 14, wherein the root of the blade body is used for being connected with a rotating shaft, and the top end of the blade body is connected with a replaceable blade tip 2. With the development of the blade tip prolonging and efficiency increasing technology, the length of the blade is longer and longer, the length of the blade tip 2 in the embodiment is 0.2-5m, the connecting surface of the blade tip 2 and the blade body 1 is not less than 10cm in the thickness direction of the blade, the shapes of the connecting surfaces of the blade body and the blade tip are the same, and the surface of the connecting area between the blade body 1 and the blade tip 2 is in smooth transition so as to ensure the continuity of the aerodynamic shape of the whole blade.
The blade tip 2 of the present embodiment is made of an insulating material, and the thickness of the blade tip 2 is very thin, and is between 10cm and 40 cm. The top end of the blade tip 2 is not provided with a lightning receptor, but the top end is designed into a smooth transition structure without sharp corners.
The blade tip 2 of the present embodiment may be a solid structure or a hollow structure. Specifically, the shell of the blade tip 2 is an insulating skin formed by molding an insulating composite material, wherein the insulating composite material is a glass fiber composite material or a composite material formed by mixing glass fibers and other fibers. When the interior of the blade tip 2 is hollow, the interior of the blade tip 2 can be filled with insulating gas such as nitrogen, heptafluoroisobutyronitrile and the like to increase the voltage resistance. In addition, the inside of the blade tip 2 may be filled with insulating liquid such as insulating oil, or with light insulating material such as adhesive glue, silica gel, or foam, so that the inside of the casing forms a solid structure to increase the voltage resistance.
In this embodiment, the top end of the blade body 1 is connected to the blade tip 2 through a mounting structure.
As shown in fig. 2, the mounting structure includes: the blade comprises an inserting column 4 and a slot 5, wherein the inserting column 4 is arranged on the blade body 1, the slot 5 is arranged on the blade tip 2, and at the moment, the inserting column 4 needs to be inserted into the blade tip 2, so that the inserting column 4 needs to be made of a non-conductive insulating material such as glass fiber reinforced plastics. During connection, the inserting columns 4 are inserted into the inserting grooves 5, then the two joint surfaces of the blade body 1 and the blade tip 2 are connected in a bonding mode, and then the periphery of the joint is reinforced through bonding composite materials. In addition, as an alternative embodiment, the blade body 1 and the blade tip 2 may be fixedly connected by other conventional fixing means besides gluing, for example, by fasteners or mortise and tenon fastening.
The blade body 1 of this embodiment is provided with the lightning receptor 3, the lightning receptor 3 adopts stainless steel material, and in addition, as an alternative implementation, the lightning receptor 3 can also adopt other conductor materials such as aluminum alloy, copper or copper alloy. In particular, the lightning receptor 3 is provided with a cylindrical body for attachment, which is inserted into the blade body 1 in the region close to the mounting structure and then fixed by means of gluing. In addition, as an alternative embodiment, the lightning receptor 3 may be connected to the blade body 1 by other conventional fixing means besides adhesion, such as fasteners, mortise and tenon joints, etc.
As shown in fig. 2, the blade body 1 includes a down conductor 7, one end of the down conductor 7 is connected to the lightning receptor 3, the down conductor 7 has a medium voltage cable voltage rating of not less than 17.5kv within at least 5m from the lightning receptor 3, and the down conductor 7 is connected to the lightning receptor 3 by a fastener or by thermal welding.
Example 2
The present embodiment provides a specific implementation manner of a wind turbine blade, and as shown in fig. 3, the structure of the wind turbine blade of the present embodiment is substantially the same as that of embodiment 1, except that: the mounting structure of the present embodiment includes: insert post 4 and slot 5, insert post 4 and set up on blade tip 2, slot 5 sets up on blade body 1, and at this moment, owing to insert post 4 and be a part of blade tip 2, consequently, for slot 5, need not to require slot 5 must be insulating.
In this embodiment, the part of the lightning receptor 3 forms the slot 5, the slot 5 is used for matching with the insertion column 4 at the root of the blade tip 2, when the connection is performed, the insertion column 4 on the blade tip 2 is inserted into the slot 5 at the end of the lightning receptor 3, and then the lightning receptor is fixed by gluing, so that the installation can be completed. In addition, as an alternative embodiment, the blade tip 2 and the lightning receptor 3 may be fixed by other conventional fixing means besides gluing, for example, by fasteners or mortise and tenon fixing.
Example 3
The present embodiment provides a specific implementation manner of a wind turbine blade, as shown in fig. 4, the structure of the wind turbine blade of the present embodiment is substantially the same as that of embodiment 2, except that: the root of apex 2 of this embodiment is provided with slot 5 equally, then adopts connecting strip 6, connects arrester 3 and apex 2 respectively.
Specifically, when the lightning arrester is connected, the two ends of the connecting strip 6 are respectively inserted into the slot 5 of the lightning arrester 3 and the slot 5 of the blade tip 2, and then the lightning arrester can be installed after being fixed by glue. In addition, as an alternative embodiment, the blade tip 2 and the lightning receptor 3 may be fixed by other conventional fixing means besides gluing, for example, by fasteners or mortise and tenon fixing.
Example 4
The embodiment provides a wind-powered electricity generation blade's embodiment, and wind-powered electricity generation blade's of this embodiment apex 2 is hollow structure, consequently, when apex 2 and the blade body 1 of this embodiment are connected, adopts the form of edge direct bonding to connect, then, at the outer lane of apex 2 and the junction of blade body 1, adopts insulating combined material to paste the reinforcement.
In addition, as an alternative real-time manner, the blade tip 2 and the blade body 1 of the present embodiment may be connected by other conventional connection manners besides adhesion, for example, by fasteners or by mortise and tenon joints.
Example 5
The embodiment provides a method for manufacturing a blade tip, and particularly relates to a method for manufacturing a blade tip through a die, which includes the following steps:
and in the blade tip mould, insulating composite materials are adopted to form the blade tip with a hollow structure.
The interior of the blade tip is filled with an insulating substance to finally form an insulated blade tip.
Wherein, in the interior of the blade tip, according to the actual needs, can fill insulating solid, for example, fill insulating foam, pack insulating foam into the blade tip from the opening of blade tip root.
It is also possible to fill the blade tips with an insulating liquid, for example, an insulating oil, which is injected into the blade tips from the opening at the root of the blade tips and then the opening is adhesively sealed with glass fiber reinforced plastic.
It may also be filled with an insulating gas, for example, an inert gas: and nitrogen is injected into the blade tip from the opening at the root of the blade tip, and then the opening is sealed by adopting glass fiber reinforced plastics.
Example 6
The embodiment provides an assembling method of a blade, which includes the following steps when the blade body and the blade tip are assembled when a die is independently adopted to produce the blade body and the blade tip:
providing a formed blade body and a blade tip;
and arranging a bonding material at the joint surface of the blade tip and/or the mounting structure of the blade body.
And the blade tips are adhered to the joint surfaces of the mounting structures of the blade body to be connected in a bonding manner.
And the joint of the blade tip and the mounting structure of the blade body is bonded and reinforced by wrapping an insulating material.
Example 7
The embodiment provides a manufacturing method of a blade, which comprises the following steps:
combining and connecting molds for manufacturing the blade body and the blade tip together;
forming the blade tip by adopting an insulating composite material in the blade tip mould;
and forming the blade body in a blade mold, so that the blade body and the blade tip are formed into a whole in the mold.
The manufacturing method of the blade further comprises the following steps: set up the arrester on the blade body, the arrester be provided with multiple form, wherein include: connecting the lightning receptor to the mounting structure of the blade body; further comprising: connecting a lightning receptor at a region of the blade body proximate the mounting structure; further comprising: the lightning receptor and the mounting structure of the blade body are arranged into a whole.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. Megawatt wind turbine blade, characterized by comprising:
the blade comprises a blade body (1) and a blade tail, wherein the blade body (1) is provided with a front edge (11), a rear edge (12), a windward side (13) and a leeward side (14), and the top end of the blade body (1) is provided with a mounting structure for connecting a blade tip (2);
the blade tip (2) is detachably connected to the top end of the blade body (1) through the mounting structure, the blade tip (2) is made of insulating materials, a shell of the blade tip (2) is an insulating skin made of insulating composite materials, the thickness of the blade tip (2) is 10 cm-40 cm, the length of the blade tip is 0.2-5m, and the top end of the blade tip (2) is in smooth transition.
2. Megawatt wind turbine blade according to claim 1, characterized in that the blade tip (2) is of hollow construction.
3. Megawatt wind turbine blade according to claim 2, characterized in that the inside of the blade tip (2) is filled with an insulating liquid, an insulating solid or an insulating gas.
4. The megawatt wind turbine blade in accordance with claim 3, wherein the insulating gas comprises: air, nitrogen or heptafluoroisobutyronitrile, the insulating liquid comprising: an insulating oil, the insulating solid comprising: adhesive glue, balsa wood, PET, silicone or insulating foam.
5. A megawatt wind turbine blade according to any one of claims 1-4, characterized in that a lightning receptor (3) is arranged on the mounting structure of the blade body, which lightning receptor (3) is electrically connected with a down conductor (7) inside the blade body (1).
6. A megawatt wind turbine blade according to any one of claims 1-4, characterized in that the blade body (1) is provided with a lightning receptor (3) at a region close to the mounting structure for connecting the blade tip (2), the lightning receptor (3) being electrically connected with a down conductor (7) within the blade body (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020212717637 | 2020-07-01 | ||
| CN202021271763 | 2020-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212716981U true CN212716981U (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021702630.0U Active CN212716981U (en) | 2020-07-01 | 2020-08-14 | Megawatt wind power blade |
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|---|---|
| CN (1) | CN212716981U (en) |
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2020
- 2020-08-14 CN CN202021702630.0U patent/CN212716981U/en active Active
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