A connection device for wind turbine blades

Abstract

This utility model discloses a connection device for wind turbine blades, relating to the field of wind turbine blade assembly technology. It includes multiple blade bodies, with adjacent blade bodies fixed by a connection unit. The connection unit includes: a connecting core disposed inside the connection point of adjacent blade bodies; and a blind hole rivet for fixing the blade body to the connecting core. The blade body has a through hole for the blind hole rivet; the connecting core has a connection hole for connecting the blind hole rivet; the connection hole consists of an inner threaded section and an outer smooth section; the blind hole rivet has a second threaded section and a second smooth section corresponding to the connection hole. This utility model enables a tighter connection between the blade body, the connecting plate, and the connecting core.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine blade assembly technology, specifically a connection device for wind turbine blades. Background Technology

[0002] Wind turbine blades must cope with various external environmental factors such as wind speed changes, turbulence, and wind shear. These factors can cause dynamic responses such as vibration, bending, and torsion in the blades. Furthermore, large wind turbine blades can be tens or even hundreds of meters long, so they are usually produced, transported, and assembled on-site in sections.

[0003] The existing blades are connected and fixed by rivets when they are assembled in sections. However, rivets are fixed by clamping force, so the blades are prone to slight displacement. A single wind turbine blade requires hundreds of rivets to connect. Assembly errors and the clamping performance of the rivets themselves can easily cause the blades to wobble, and the cumulative error will significantly increase the amplitude of the blade wobble. Utility Model Content

[0004] The purpose of this invention is to provide a connection device for wind turbine blades to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a connecting device for wind turbine blades, comprising multiple blade bodies, with adjacent blade bodies fixed by a connecting unit; the connecting unit includes: The connecting core is located on the inner side of the connection between two adjacent blade bodies; Blind hole rivets are used to fix the blade body to the connecting core; The blade body has a through hole for inserting a blind rivet; the connecting core has a connecting hole for connecting the blind rivet. The connecting hole consists of an inner threaded section and an outer smooth section. The blind hole rivet is provided with a threaded section two and a smooth section two corresponding to the connecting hole.

[0006] As a further embodiment of this utility model, the connecting hole is stepped, and the diameter of the smooth rod section is larger than the diameter of the threaded section.

[0007] As a further embodiment of this utility model, the connecting unit further includes two connecting plates, which are respectively disposed on the upper and lower sides of the connection between the two blade bodies; a second through hole is provided on the connecting plate at the position corresponding to the first through hole.

[0008] As a further embodiment of this utility model, the second through hole is configured as an inverted cone shape.

[0009] Compared with the prior art, the beneficial effects of this utility model are: This utility model, through the setting of blind hole rivets and connecting holes, and the threaded engagement of threaded section two and threaded section one, can play a role in positioning and pre-tightening the connection between the blade body and the connecting core. At the same time, it can also prevent the blind hole rivets from falling off before riveting, and facilitate subsequent riveting operations. Through the expansion of the smooth section two of the blind hole rivet, the through hole one and the smooth section one can be filled, making the connection between the blade body and the connecting core tighter. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structural connection state of this utility model; Figure 3 This is a schematic diagram of the connecting core structure of this utility model; Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 This is a schematic diagram of the blind hole rivet structure of this utility model; Figure 6 This is a schematic diagram of the connecting plate structure of this utility model; Figure 7 This is a schematic diagram of the through hole two structure on the connecting plate of this utility model.

[0011] The attached figures are labeled as follows: 1-Blade body, 2-Connecting plate, 3-Connecting core, 4-Connecting hole, 5-Blind hole rivet, 6-Threaded section one, 7-Smooth rod section one, 8-Threaded section two, 9-Smooth rod section two. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Please see Figures 1-6This utility model provides a technical solution: a connection device for wind turbine blades, comprising multiple blade bodies 1, with adjacent blade bodies 1 fixed by a connection unit; the connection unit includes a connecting core 3 and a blind hole rivet 5; the connecting core 3 is disposed on the inner side of the connection between adjacent blade bodies 1; the blind hole rivet 5 is used to fix the blade body 1 to the connecting core 3; the blade body 1 has a through hole for the blind hole rivet 5 to pass through; the connecting core 3 has a connection hole 4 for connecting the blind hole rivet 5; the connection hole 4 is composed of an inner threaded section 6 and an outer smooth section 7; the blind hole rivet 5 is provided with a second threaded section 8 and a second smooth section 9 corresponding to the connection hole 4.

[0014] refer to Figure 1 and Figure 2 During assembly, the connecting core 3 is placed inside the connection between two adjacent blade bodies 1, aligning the connecting hole 4 with the through hole 1. Then, the threaded section 8 of the blind hole rivet 5 is screwed into the threaded section 6 of the connecting hole 4. The smooth section 9 of the blind hole rivet 4 is then pressed with a rivet gun, causing the smooth section 9 to expand and fill the smooth section 7 of the connecting core 3 and the through hole 1. The threaded engagement between the threaded section 8 and the threaded section 6 provides positioning and pre-tightening for the connection between the blade body 1 and the connecting core 3, while also preventing the blind hole rivet from falling off before riveting, facilitating subsequent riveting operations. The expansion of the smooth section 9 of the blind hole rivet 4 fills the through hole 1 and the smooth section 7, making the connection between the blade body 1 and the connecting core 3 tighter.

[0015] Specifically, such as Figure 3 and Figure 4 As shown, the connecting hole 4 is stepped, and the diameter of the smooth rod section 7 is larger than the diameter of the threaded section 6; this allows for easy insertion of the blind hole rivet 5 into the connecting hole 4.

[0016] Specifically, such as Figure 1 , Figure 2 and Figure 6 As shown, the connecting unit also includes two connecting plates 2, which are respectively disposed on the upper and lower sides of the connection between the two blade bodies 1; a second through hole is provided on the connecting plate 2 at the position corresponding to the first through hole; the two connecting plates 2 cover the upper and lower sides of the blade body 1, which can protect the connection between the blade bodies 1; when the blind hole rivet 5 is installed, it first passes through the second through hole and the first through hole and then connects to the connecting hole 4; when the second smooth rod section 9 expands, it also fills the second through hole; so that the connecting plate 2, the blade body 1 and the connecting core 3 are stably connected; the side ear plates of the two connecting plates 2 can be directly riveted with ordinary rivets; so that the two connecting plates 2 form a whole, making the connection more stable.

[0017] Specifically, such as Figure 7As shown, the second through hole is designed as an inverted cone shape with a small outer diameter and a large inner diameter; after the second section 9 of the smooth rod expands and fills the second through hole, the difficulty of falling off increases, which can effectively improve the reliability of the connection.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connecting device for wind turbine blades comprising a plurality of blade bodies (1), characterised in that: Two adjacent blade bodies (1) are fixed by a connecting unit; the connecting unit includes: The connecting core (3) is located inside the connection between two adjacent blade bodies (1); Blind hole rivets (5) are used to fix the blade body (1) and the connecting core (3); The blade body (1) has a through hole for a blind rivet (5); the connecting core (3) has a connecting hole (4) for connecting the blind rivet (5). The connecting hole (4) is composed of an inner threaded section (6) and an outer smooth section (7); The blind hole rivet (5) is provided with a threaded section two (8) and a smooth section two (9) corresponding to the connecting hole (4).

2. A connecting device for a wind turbine blade according to claim 1, characterized in that: The connecting hole (4) is stepped, and the diameter of the first smooth rod section (7) is larger than the diameter of the first threaded section (6).

3. A connecting device for wind turbine blades according to claim 1, characterized in that: The connecting unit also includes two connecting plates (2), which are respectively located on the upper and lower sides of the connection between the two blade bodies (1); a through hole two is provided on the connecting plate (2) at the position corresponding to the through hole one.

4. A connecting device for a wind turbine blade according to claim 3, characterized in that: The second through hole is configured as an inverted cone shape.

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