阅读说明：本技术 一种水平轴风力发电机组叶尖结构连接装置 (Blade tip structure connecting device of horizontal shaft wind generating set ) 是由 郑磊 蔡安民 林伟荣 袁晓旭 于 2021-09-17 设计创作，主要内容包括：本发明提供的一种水平轴风力发电机组叶尖结构连接装置,包括与叶片本体材质相同的叶片本体连接体和与叶片尖部材质相同的叶片尖部连接体,其中,所述叶片本体连接体与叶片尖部连接体间采用接触挤压式连接,叶片本体与叶片本体连接体连接,叶片尖部与叶片尖部连接体连接；本发明回避了不同材料体系制造部件间粘接连接的情况,有效提升了叶片尖部结构连接设计精度,提高了相关安全性和可靠性,降低了失效概率；同时,本发明能够解决叶片尖部尺寸增大、重量增加的连接问题,起到有效连接分段制造叶片本体与叶片尖部的作用,拓宽了风力发电机组叶片生产材料、生产工艺的选择范围,合理降低大型复合材料叶片生产成型质量控制的难度,同时有效提升叶片尖部产品质量,从而降低风力发电机组部件制造、运输成本。(The invention provides a connecting device for a blade tip structure of a horizontal-axis wind generating set, which comprises a blade body connecting body made of the same material as a blade body and a blade tip connecting body made of the same material as the blade tip, wherein the blade body connecting body and the blade tip connecting body are connected in a contact extrusion manner, the blade body is connected with the blade body connecting body, and the blade tip is connected with the blade tip connecting body; the invention avoids the condition of adhesive connection between parts made of different material systems, effectively improves the connection design precision of the blade tip structure, improves the related safety and reliability and reduces the failure probability; meanwhile, the invention can solve the connection problems of increased size and increased weight of the blade tip, play a role in effectively connecting and manufacturing the blade body and the blade tip in sections, widen the selection range of production materials and production processes of the blade of the wind generating set, reasonably reduce the difficulty of the production molding quality control of the large-scale composite material blade, and effectively improve the product quality of the blade tip, thereby reducing the manufacturing and transportation cost of the components of the wind generating set.)

1. The utility model provides a horizontal axis wind generating set apex structure connecting device, its characterized in that includes blade body connector (1) the same with the blade body material and the blade point portion connector (2) the same with blade point portion material, wherein, adopt the contact extrusion formula to be connected between blade body connector (1) and blade point portion connector (2), the blade body is connected with blade body connector (1), and blade point portion is connected with blade point portion connector (2).

2. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade body connecting body (1) is connected with the blade tip connecting body (2) through a connecting rivet (3).

3. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade body is connected with the blade body connecting body (1) through bonding.

4. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade tip is connected with the blade tip connecting body (2) through mechanical assembly.

5. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade tip is connected with the blade tip connecting body (2) through bonding.

6. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade body connecting body (1) is of a variable-section single-cavity structure; the spanwise section of the single-cavity structure is rectangular, and chamfer transition is designed between adjacent surfaces; the blade body connector (1) and the connecting surface of the blade body are matched with the inner surface of the main beam.

7. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade body connecting body (1) is inserted into a cavity defined by a main beam and a shear web of the blade body.

8. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade tip connecting body (2) is arranged on two symmetrical non-adhesive surfaces of the blade body connecting body (1).

9. The connecting device for the blade tip structure of the horizontal-axis wind generating set according to claim 1, wherein the blade tip connecting body (2) is positioned in a cavity of the blade tip.

Technical Field

The invention relates to a wind generating set blade tip structure, in particular to a connecting device for a horizontal shaft wind generating set blade tip structure.

Background

With the continuous promotion of the development trend of single-machine capacity maximization of a horizontal-axis wind generating set, the wind wheel blades are increased along with more obvious effects of airflow spanwise flow, boundary layer separation and the like, so that the pneumatic design of the blades is more complex, and even the lift loss caused by three-dimensional unsteady flow needs to be considered. In order to reduce the design difficulty, the blade aerodynamic design link can introduce various aerodynamic accessories such as winglets, vortex generators, trailing edge flaps and the like by taking the existing achievements of the wings of the aircraft as reference, thereby expanding the application range of the traditional momentum phyll theory BEM design method and obtaining better effect.

However, as the complexity of the specific aerodynamic profile of the blade tip increases, the more disadvantages are exposed to the conventional manufacturing methods using fiber-reinforced composite molding: firstly, when a large wind turbine generator normally operates, the blade tip part is subjected to high incoming flow wind speed, the aerodynamic characteristics of the blade tip part are sensitive to appearance deviation, the control accuracy of geometric appearance, characteristic size, roughness and the like is enhanced, and the surface avoids methods such as hand pasting and bonding as much as possible; secondly, the shape of the tip of the complex blade is complex to bear load, a refined numerical simulation method is proposed to be introduced in the links of pneumatic design and structural design, and the design and test combined research mode is adopted to confirm the functionality and the safety; thirdly, the special shape of the blade tip has a position with a smaller surface curvature radius, and the process defects such as folds and bubbles which are easily shown in manufacturing links such as layering and injection molding are suggested to be concerned, so that the damage and the damage of a stress concentration and speed increasing structure are avoided. In any aspect, the design and manufacturing links of the wind turbine blade of the wind turbine generator system are troubled by the complexity of the special aerodynamic shape of the blade tip, and the design and manufacturing links are determined by the characteristics of the composite material. If the structural modeling is completed by replacing a metal material system, namely the force bearing structure uses a metal frame consisting of customized curves, and the pneumatic appearance is realized by coating a metal skin, the design and manufacturing problems can be better avoided, and the functionality and the safety of the blade tip part are improved. The large-scale wind power blade is predicted to be developed into system planning/design, segmented production/transportation/hoisting and combined installation/debugging in the future, and even can be realized by introducing different material systems and different manufacturing process combinations.

The structural connection design of novel metal material blade point portion and combined material blade body just becomes the problem that new jin appeared. In order to solve the problem of lightning strike, the traditional composite material blade uses an aluminum blade tip and is fixed by structural adhesive in a bonding way. In the actual operation process, the situation that the aluminum blade tip falls off occurs, and then methods such as increasing the bonding area, designing a clamping mode and the like are adopted, so that the structural connection form of the aluminum blade tip is improved, and the connection safety is effectively improved. But the problem that novel metallic material blade tip structural connection meets can be more complicated: firstly, the novel metal blade tip has more detailed appearance and small aluminum density, but the material has low rigidity and is easy to deform, so that the complicated requirement of the special aerodynamic appearance of the blade tip cannot be met; secondly, the size of the blade tip part made of the novel metal material is larger, the weight is increased, the limit load and the fatigue load which need to be borne by the bonding position under the action of the pneumatic load and the rotary centrifugal load are higher, and higher requirements are provided for the structural connection safety of the blade tip part; thirdly, the metal material and the composite material are bonded through structural adhesive, and the different materials are easy to deform and not coordinate, so that fatigue crack propagation of process defects is easy to occur, and finally the bonding surface fails. Therefore, there is a need to improve and upgrade the conventional blade tip structure connection method, and to design a more secure and reliable solution.

This patent is tried to describe a apex structure connecting device, can play the effect that increases horizontal axis wind generating set apex structure connection design security and reliability. The design and research method of the device is mature, the process construction is easy to realize, the reliability is high, and the influence on the safety of the blade is small.

Disclosure of Invention

The invention aims to provide a connecting device for a blade tip structure of a horizontal-axis wind generating set, which overcomes the defects of safety and poor reliability of a traditional blade tip structure connecting mode in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a blade tip structure connecting device of a horizontal shaft wind generating set, which comprises a blade body connecting body made of the same material as a blade body and a blade tip connecting body made of the same material as a blade tip, wherein the blade body connecting body and the blade tip connecting body are connected in a contact extrusion mode, the blade body is connected with the blade body connecting body, and the blade tip is connected with the blade tip connecting body.

Preferably, the blade body connector and the blade tip connector are connected through a connecting rivet.

Preferably, the blade body is connected with the blade body connecting body through bonding.

Preferably, the blade tip and the blade tip connector are connected by mechanical fitting.

Preferably, the blade tip and the blade tip connector are connected by bonding.

Preferably, the blade body connector is of a variable cross-section single-cavity structure; the spanwise section of the single-cavity structure is rectangular, and chamfer transition is designed between adjacent surfaces; the blade body connector and the connecting surface of the blade body are matched with the inner surface of the main beam.

Preferably, the blade body connecting body is inserted into a cavity defined by a main beam and a shear web of the blade body.

Preferably, the blade tip connector is mounted on two symmetrical non-adhesive faces of the blade body connector.

Preferably, the blade tip interface is located within a cavity of the blade tip.

Compared with the prior art, the invention has the beneficial effects that:

the blade tip structure connecting device of the horizontal axis wind generating set can effectively realize the blade tip structure connecting function, does not damage the structure of the original composite material blade body, and does not reduce the safety of the corresponding main beam and the shear web; according to the contact extrusion type connection between the blade body connector and the blade tip connector, the condition of bonding connection between manufacturing components of different material systems is avoided, the structural connection design precision of the blade tip is effectively improved, the related safety and reliability are improved, and the failure probability is reduced; meanwhile, the invention can solve the connection problems of increased size and increased weight of the blade tip, play a role in effectively connecting and manufacturing the blade body and the blade tip in sections, widen the selection range of production materials and production processes of the blade of the wind generating set, reasonably reduce the difficulty of the production molding quality control of the large-scale composite material blade, and effectively improve the product quality of the blade tip, thereby reducing the manufacturing and transportation cost of the components of the wind generating set.

Furthermore, due to the supporting effect of the blade body connecting body on the cavity formed by the main beam and the shear web plate in a surrounding mode, the large deformation of the connecting section after being loaded can be avoided, and the local buckling stability and the torsional rigidity are improved, so that the large deformation fatigue problem and the flutter risk of the tip part of the large flexible blade and the connecting section are reduced.

Furthermore, the connection of the bearing structures in the blade body, namely the bonding connection between the blade body connector and the blade body, is completed in a cavity defined by the main beam and the shear web of the blade body, so that the process quality requirements of composite materials such as positioning, heat preservation, curing and the like can be ensured; the bearing structure outside the blade body is connected, namely the blade tip connecting body is in assembly connection or bonding connection with the blade tip, and the posture positioning of the blade tip structure connecting device is completed, so that the construction operation is more favorably standardized, the finished product quality is improved, and the process period is shortened. The difficulty of high-altitude operation of operators is effectively reduced, and the advantages of technical transformation and popularization of the on-site blade tip are obvious.

Furthermore, through adhesive bonding connection among composite materials, mechanical assembly connection among metal materials and contact extrusion connection between the blade body connector and the blade tip connector, the device avoids the condition of bonding connection among different material system manufacturing components, effectively improves the structural connection design precision of the blade tip, improves the related safety and reliability and reduces the failure probability.

Furthermore, the appearance design of the blade body connector of the device can play a role of forming a cavity with the main beam of the blade body and the shear web plate to form a clamping effect, effectively avoids the blade body from falling off from the direction of the blade tip, and reduces the safety risk of the surrounding environment of the wind generating set.

Furthermore, the connecting device provides possibility for the blade tip to be manufactured by using a metal material, and reduces the probability of damage to the adjacent structure of the blade caused by the lightning receptor at the blade tip in the lightning guiding process, so that the operation and maintenance cost of the wind power plant is reduced.

Drawings

FIG. 1 is a front view of a tip structure attachment apparatus;

FIG. 2 is a side view of the tip structure attachment means.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the blade tip structure connecting device of a horizontal axis wind turbine generator system provided by the invention comprises a blade body connecting body 1, a blade tip connecting body 2 and a connecting rivet 3, wherein the blade body connecting body 1 and the blade tip connecting body 2 are connected in a contact extrusion manner.

The preparation materials between the blade body connector 1 and the blade body are the same.

The blade tip connector 2 is made of the same material as the blade tip.

The composite materials are connected in an adhesive bonding mode, and the metal materials are connected in a mechanical assembly mode.

The blade body connector 1 is connected with the blade tip connector 2 in a contact extrusion mode through the connecting rivet 3.

The blade body connector 1 and the blade body are both made of composite materials, and are connected in an adhesive bonding mode through structural adhesive; the blade body connector 1 and the blade body are connected by an adhesive surface.

The blade tip connecting body 2 and the blade tip are both made of metal materials and are connected in a mechanical assembly mode through welding, bolts, interference fit and the like; or both are made of composite materials, and the connection in an adhesive bonding mode is realized through structural adhesive.

The blade tip connecting body 2 is inserted into a cavity of the blade tip.

The structural form of the blade body connector 1 is as follows: the variable cross-section single-cavity structure of the composite material is characterized in that the spanwise cross section of the single-cavity structure is rectangular, and chamfer transition is designed between adjacent surfaces; the composite material blade is arranged in the composite material blade body and is inserted into a cavity defined by the main beam and the shear web; and the bonding surface of the blade body connector is matched with the inner surface of the main beam; the blade tip connecting body is connected with the inner surface of the main beam in an adhesive bonding mode through structural adhesive and connected with the blade tip connecting body 2 in a contact extrusion mode through a connecting rivet 3. The function is as follows: the load carried by the blade tip connection 2 is transferred to the main blade of the blade body.

Structural form of blade tip connection 2: the blade tip supporting structures designed in pairs are made of the same material as the blade tips, are arranged on the non-bonding surface of the blade body connecting body 1, and are connected with the blade body connecting body 1 in a contact extrusion mode through connecting rivets 3; the blade tip part is connected with a mechanical assembly mode through welding, bolts, interference fit and the like, or is connected with a composite material blade tip part through a structural adhesive bonding mode. The function is as follows: positioning and supporting the blade tip; transmitting the blade tip load to the blade body interface 1.

The structural form of the connecting rivet 3 is as follows: and the mechanical rivets are designed in pairs and are arranged at the joint of the non-bonding surface of the blade body connector 1 and the blade tip connector 2. The function is as follows: connecting a blade body connector 1 and a blade tip connector 2; the transfer blade tip is loaded.

The working principle of the wind generating set blade tip structure connecting device related by the invention is described as follows:

when the blade runs, the blade tip can bear complex load effects such as pneumatic load, centrifugal load and the like, and the blade tip is connected in a mechanical assembly or adhesive bonding mode to transmit the bearing load to the blade tip connector 2; the blade tip connecting body 2 is connected in a contact extrusion mode, and the bearing load is transmitted to the blade body connecting body 1; the blade body connector 1 is connected in an adhesive bonding mode, and bearing load is transmitted to a main bearing structure of the blade body, so that the structural connection effect of the tip part of the blade is realized.

The blade body connector 1 and the blade body, the blade tip connector 2 and the blade tip are respectively made of the same material, the composite materials are connected by only using an adhesive bonding mode, and the metal materials are connected by only using a mechanical assembly mode; only a contact extrusion mode is used for connection between the blade body connector 1 and the blade tip connector 2, so that the effects of reducing the difficulty of a connection process and improving the connection safety and reliability are achieved.

The technical requirements of the wind generating set blade tip structure connecting device related by the invention can affect the effect of the safety and the reliability of the blade tip structure connection, so the invention needs to be taken as a part of the invention and is described as follows:

the blade is used as a slender variable-section beam structure, the section size of a cavity defined by a main beam and a shear web is changed along with the spanwise position, and the section size is gradually reduced from a blade root to a blade tip. The blade body is made of composite materials, the blade body connector 1 is designed to be of a composite material variable-section single-cavity structure, the bonding surface of the blade body connector only comprises an upper surface 4 of the composite material bonding surface and a lower surface 5 of the composite material bonding surface, and the rest surfaces are non-bonding surfaces. The bonding surface of the blade body connector 1 is designed according to the inner side geometric shape of a main beam close to the tip part of the blade body, so that the process requirement of bonding thickness can be met by ensuring the structural adhesive of the two bonding surfaces. Because the geometric shape of customized design can satisfy the dress card mode requirement, even if the two bonding face structure glues the complete failure condition, apex structure connecting device can die because the cross-sectional dimension card effectively avoids droing from the apex direction. The non-bonding surface of the blade body connector 1 is not contacted with any surface of the blade body, so that load transmission on a path outside the bonding surface between the blade body connector 1 and the blade body is avoided, and the structural safety of the shear web of the blade body is effectively protected.

The blade body connector 1 adopts a layering mode of winding a single bundle of fiber clusters or circumferentially laying fiber fabrics. For the circumferential laying condition of the fiber fabric, the lapping positions of the layers are arranged in the bonding surface, the lapping positions of different layers are staggered layer by layer, and the distance meets the requirements of process documents. The contact extrusion mode between blade body connector 1 and blade point connector 2 is connected and should be arranged in the non-bonding face, and 3 position symmetric distributions of connecting rivet to guarantee that the waving direction moment of flexure, the shimmy direction moment of flexure, the torsion direction moment of torsion, span direction power of following the transmission of blade point can turn into the load on evenly distributed connecting rivet 3, realize load transmission through the contact extrusion mode between connecting rivet 3 and blade body connector 1, blade point connector 2.

If the blade tip is made of metal materials, the blade tip connector 2 is designed into a supporting structure made of the same metal materials and is connected in a corresponding mechanical assembly mode; if the blade tip is made of composite material, the blade tip connector 2 is designed as the same composite material support structure and is connected in a corresponding adhesive bonding manner. The use of the same material means that the material for manufacturing the two members to be connected and the connecting material have the same material system and the matched mechanical properties.

The blade body connector 1 is prefabricated and molded, is connected with the blade tip connector 2, and then enters from the root of the blade body through a guide tool, is conveyed to the tip, and is coated with structural adhesive on a bonding surface by using an auxiliary tool, so that the main beam and the shear web are bonded and fixed in a cavity surrounded by the main beam. And adopting a corresponding connection mode to connect the blade tip connecting body 2 with the blade tip. And finally, sealing and packaging the surface contact line of the blade body and the blade tip.

A numerical analysis model is established according to information such as the geometric shapes, the material properties and the connection modes of the blade body, the blade tip part and the blade tip structure connection device, the distribution rule of the transmitted load is simulated, the size of the bonding surface is determined, the structural layering scheme is optimized, and the like, so that the safety and the reliability of the blades of the wind generating set and the related connection structure are effectively guaranteed.

The structure connecting device is clear in load transmission path and strong in structure designability, can effectively solve the connection problem caused by size increase, weight increase and the like of the blade tip part, is suitable for the connection of the blade body manufactured in a segmented mode and the blade tip part, can be made of the same or different materials, and is applied to assembly of the blade tip part and transformation of blade extension technology. The blade tip structure connecting device can achieve safe and reliable structure connecting effects on blade tips produced by different process methods, such as metal material welding, composite material three-dimensional printing and the like.

When the blade runs, the blade tip can bear complex load effects such as pneumatic load, centrifugal load and the like, and the blade tip is connected in a mechanical assembly or adhesive bonding mode to transfer the bearing load to a blade tip connector; the blade tip connecting bodies are connected in a contact extrusion mode, and load bearing loads are transmitted to the blade body connecting bodies; the blade body connector is connected in an adhesive bonding mode, and bearing load is transmitted to a main bearing structure of the blade body, so that the connection effect of the tip part structure of the blade is realized.

The blade body connector and the blade body, and the blade tip connector and the blade tip are respectively made of the same material, the composite materials are connected by only using an adhesive bonding mode, and the metal materials are connected by only using a mechanical assembly mode; only a contact extrusion mode is used for connection between the blade body connector and the blade tip connector, so that the effects of reducing the difficulty of a connection process and improving the connection safety and reliability are achieved.