Blade root structure, blade and wind turbine

Abstract

The utility model discloses a kind of blade root structure, blade and wind-driven generator, blade root structure includes blade root, the end surface of blade root is equipped with multiple blade root connectors, each blade root connector is unevenly arranged along the circumference of blade root to form blade root connector dense area in the high load area of blade root.The utility model has the advantages of being able to extend the service life of blade root without increasing the existing material cost, reduce operating and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, and in particular to a blade root structure, blade and wind turbine. Background Technology

[0002] In wind power generation equipment, the blades are connected to the wind turbine through the blade root. The blade root must bear the weight of the entire blade and withstand various loads. With the increasing power of the entire turbine and the increasingly longer and more flexible wind turbine blades, the load on the blades during wind turbine operation is becoming increasingly large, leading to frequent problems with the blade root connection.

[0003] The applicant discovered that during operation, the blade root load of the wind turbine is non-uniformly distributed due to factors such as its shape and operation (e.g., Figure 2 As shown in the diagram, under a conventional, uniformly arranged bolt arrangement, bolt life in some high-load areas is extremely short, making them highly susceptible to ultimate and fatigue failure. Current reinforcement methods typically increase the number of bolts at the blade root by increasing the pitch circle diameter, thereby enhancing the load-bearing capacity of the blade root and ensuring the safety and reliability of the blade connection. However, this approach significantly increases the cost of electric blades and wind turbine units, and the blade root diameter is limited by transport altitude and production capacity, preventing its unlimited increase. Utility Model Content

[0004] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a blade root structure that can extend the service life of the blade root and reduce operation and maintenance costs without increasing existing material costs. A blade and a wind turbine are also provided.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A leaf root structure includes a leaf root, and the end face of the leaf root is provided with a plurality of leaf root connectors. Each of the leaf root connectors is non-uniformly arranged along the circumference of the leaf root to form a dense area of ​​leaf root connectors in the high load region of the leaf root.

[0006] As a further improvement to the above technical solution: The distribution of each blade root connector is matched with the load distribution of the blade root.

[0007] The angles between two adjacent leaf root connectors are distributed in an arithmetic sequence.

[0008] The first term of the arithmetic sequence is 3°, and the common difference is 0.02°.

[0009] The angles between two adjacent leaf root connectors are distributed in a geometric sequence.

[0010] The first term of the geometric sequence is 3°, and the common ratio is 1.01.

[0011] The blade root connector includes bolt holes formed on the end face of the blade root and bolts inserted into the bolt holes.

[0012] The blade root connector includes a bolt sleeve pre-embedded on the end face of the blade root and a bolt inserted into the bolt sleeve.

[0013] A leaf blade comprising the aforementioned leaf root structure.

[0014] A wind turbine includes the blades described above.

[0015] Compared with the prior art, the advantages of this utility model are: 1. The blade root structure of this utility model, through the non-uniform arrangement of the blade root connectors, enables the distribution of the blade root connectors to adapt to the load distribution of the blade root, thereby extending the service life of the blade root and reducing operation and maintenance costs without increasing the existing material costs.

[0016] 2. In the blade root structure of this utility model, the blade root connectors are distributed in a linear proportion according to the load distribution curve of the blade root, so that the load on each blade root connector is more evenly distributed, the service life of each blade root connector is more consistent, and the service life of the blade root is further extended. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the leaf root structure in this utility model.

[0018] Figure 2 This is a load distribution diagram of the existing leaf roots.

[0019] The labels in the diagram represent: 1. Leaf root; 2. Leaf root connector; 3. Dense area of ​​leaf root connectors. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Example 1: like Figure 1 As shown, the blade root structure of this embodiment includes a blade root 1. The end face of the blade root 1 is provided with a plurality of blade root connectors 2. Each blade root connector 2 is non-uniformly arranged along the circumference of the blade root 1 to form a dense area 3 of blade root connectors in the high load area of ​​the blade root 1.

[0025] In this embodiment of the blade root structure, the multiple blade root connectors 2 on the end face of the blade root 1 are arranged non-uniformly. A dense area 3 of blade root connectors 3 is formed in the high-load region of the blade root 1. That is, in the high-load region, more blade root connectors 2 are used, making the blade root connectors 2 more dense and distributing the load borne by each individual blade root connector 2. In the low-load region, the blade root connectors 2 are relatively sparser. This embodiment of the blade root structure, through the non-uniform arrangement of the blade root connectors 2, allows the distribution of the blade root connectors 2 to adapt to the load distribution of the blade root 1, extending the service life of the blade root 1 and reducing operation and maintenance costs without increasing existing material costs.

[0026] Furthermore, in this embodiment, the distribution of each blade root connector 2 matches the load distribution of the blade root 1, that is, the blade root connector 2 is distributed in a linear proportion according to the load distribution curve of the blade root 1, so that the load on each blade root connector 2 is more evenly distributed, the service life of each blade root connector 2 is more consistent, and the service life of the blade root 1 is further extended.

[0027] Of course, in other embodiments, the blade root connectors 2 can also adopt other non-uniform arrangement forms. For example, the interval angles between two adjacent blade root connectors 2 are distributed in an arithmetic sequence, with the first term of the arithmetic sequence being 3° and the common difference being 0.02°, and the interval angles between two adjacent blade root connectors 2 being 3.05°, 3.07°, 3.09°, 3.11°, 3.13°, etc. As another example, the interval angles between two adjacent blade root connectors 2 are distributed in a geometric sequence, with the first term of the geometric sequence being 3° and the common ratio being 1.01, and the interval angles between two adjacent blade root connectors 2 being 3.050°, 3.081°, 3.111°, 3.142°, etc. Using a geometric or arithmetic arrangement for the blade root connectors 2 facilitates processing and installation. Of course, in many other embodiments, the blade root connectors 2 can also adopt an irregular, non-uniform arrangement form.

[0028] Furthermore, in this embodiment, the blade root connector 2 includes a bolt hole formed on the end face of the blade root 1 and a bolt inserted into the bolt hole. Of course, in other embodiments, other connection methods can also be used. For example, the blade root connector 2 includes a bolt sleeve pre-embedded on the end face of the blade root 1 and a bolt inserted into the bolt sleeve. That is, the pre-embedded bolt sleeve method is used, so that the blade root structure of this embodiment can be applied to blade roots 1 with various connection methods, and has strong applicability.

[0029] Example 2: The blade of this embodiment includes the leaf root structure of Embodiment 1. The beneficial effects of the blade of this embodiment can be referred to Embodiment 1 accordingly, and the structures of other parts of the blade can be referred to the prior art, which will not be repeated here.

[0030] Example 3: The wind turbine of this embodiment includes the blades of Embodiment 2. The beneficial effects of the wind turbine of this embodiment can be referred to Embodiment 1 accordingly, and the structure of other parts of the wind turbine can be referred to the prior art, which will not be described in detail here.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A leaf root structure, characterized in that: Includes a blade root (1), and the end face of the blade root (1) is provided with a plurality of blade root connectors (2). Each blade root connector (2) is non-uniformly arranged along the circumference of the blade root (1) to form a dense area of ​​blade root connectors (3) in the high load area of ​​the blade root (1). The interval angles between two adjacent leaf root connectors (2) are distributed in an arithmetic sequence; or, the interval angles between two adjacent leaf root connectors (2) are distributed in a geometric sequence.

2. The leaf root structure according to claim 1, characterized in that: The distribution of each blade root connector (2) matches the load distribution of the blade root (1).

3. The leaf root structure according to claim 1, characterized in that: The first term of the arithmetic sequence is 3°, and the common difference is 0.02°.

4. The leaf root structure according to claim 1, characterized in that: The first term of the geometric sequence is 3°, and the common ratio is 1.

01.

5. The leaf root structure according to any one of claims 1 to 4, characterized in that: The blade root connector (2) includes a bolt hole on the end face of the blade root (1) and a bolt inserted into the bolt hole.

6. The leaf root structure according to any one of claims 1 to 4, characterized in that: The blade root connector (2) includes a bolt sleeve pre-embedded on the end face of the blade root (1) and a bolt inserted into the bolt sleeve.

7. A blade, characterized in that: Includes the leaf root structure as described in any one of claims 1 to 6.

8. A wind turbine generator, characterized in that: Includes the blade as described in claim 7.

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