Lightweight wind power truss type tower connecting node

Abstract

The utility model discloses a light-weight wind power truss type tower connecting node which comprises a node connecting pipe and an inclined rod. According to the utility model, when the inclined rod is connected with the node connecting pipe, the self-strength of the node connecting pipe is improved through a plurality of groups of vertical ribs arranged on the inner side wall, and meanwhile, the reinforcing sleeve is also welded on the outer wall of the node connecting pipe, so that the strength of the node connecting pipe is further improved through the reinforcing sleeve, and the connecting stability is improved; the outer wall of the reinforcing sleeve is provided with a node fixing base with a connecting cavity matched with the inclined rod in shape, after the inclined rod is inserted into the connecting cavity, the vertical long edge and the two sets of transverse short edges of the I-shaped inclined rod are fixedly riveted to the node fixing base through a plurality of sets of second rivets and first rivets, that is, the end, connected with the node connecting pipe, of the inclined rod is fixed in a full-surrounding mode, and the node connecting pipe is fixed in a full-surrounding mode. And four sets of inclined ribs are further arranged on the outer wall of the joint fixing base, so that the connection stability is further improved.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a lightweight wind power truss tower connection node. Background Technology

[0002] Wind energy, as a clean and renewable energy source, has received widespread attention. Truss wind turbine towers achieve optimal material distribution in space, obtaining sufficient strength, stiffness, and stability with minimal material cost, and are widely used in the wind power field. Currently, the fastening connection methods for lightweight truss wind turbine towers are mainly welding and bolting. Bolting connections generally use the torque method, which is inexpensive and convenient. However, applying torque creates preload on the bolts, which can reduce the bolt's load-bearing capacity, make the applied prestress inaccurate, and reduce the bolt's anti-loosening performance. Furthermore, bolted connections are prone to fatigue failure or detachment due to vibration under alternating loads. Additionally, the large gap between the nut and bolt can cause the bolt to loosen or experience stress corrosion-induced delayed fracture, resulting in poor vibration resistance, anti-loosening properties, and fatigue resistance for tower flanges using high-strength bolt connections.

[0003] During normal operation of a wind turbine, the bolts of various connecting components are subjected to the combined forces of various vibrations over a long period, making them prone to loosening. To prevent uneven stress and shearing of the bolts after loosening, regular anti-loosening checks must be performed. Current technologies rely on manual periodic inspections and maintenance, which are labor-intensive and costly. Furthermore, during operation, the flanges of traditional wind turbine towers are under eccentric tension. When the outer edge of the flange opens and shifts, the stress on the bolts increases linearly with the tension of the tower wall, and the stress amplitude also increases significantly. Therefore, traditional wind turbine tower flanges have certain structural defects. To address this, a publicly available technology proposes a wind turbine tower connection node structure, mainly including a node steel pipe tower column and a vertical connecting device. The two ends of the node steel pipe tower column are connected to the upper and lower tower sections respectively through the vertical connecting device. The node steel pipe tower column has two vertically arranged node plates, which are at a certain angle to each other. The node plates are used to connect the truss diagonal members. The disclosed technology utilizes structural high-strength rivets to provide more stable connection support for truss wind turbine tower connection nodes. The structural high-strength rivets employ riveting technology, preventing loosening and resisting fatigue, which can greatly reduce subsequent maintenance work, essentially achieving low-maintenance or even maintenance-free operation of structural connection fasteners.

[0004] However, the above-mentioned structure still has certain drawbacks in its use. The diagonal brace and the node plate are only fixedly connected by a planar connecting plate and multiple sets of rivets, resulting in a very limited connection range and unstable connection. The node plate and the node steel pipe tower column are only reinforced by an arc-shaped transverse stiffening plate located between the two sets of node plates on opposite sides, which limits the reinforcement methods. Furthermore, there is no corresponding reinforcement structure inside the node steel pipe tower column. Obviously, the above defects lead to insufficient fracture resistance of the structure in practical applications, and further improvements are necessary. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a lightweight wind power truss tower connection node.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a lightweight wind turbine truss tower connection node, comprising a node connection pipe and a diagonal brace, wherein the inner wall of the node connection pipe is provided with a first reinforcing rib structure for improving the strength of the node connection pipe, a reinforcing sleeve is fixedly connected to the outer wall of the node connection pipe, a node fixing seat is fixedly connected to the outer wall of the reinforcing sleeve, a second reinforcing rib structure for supporting the node fixing seat is provided between the node fixing seat and the reinforcing sleeve, the diagonal brace is provided at the end of the node fixing seat away from the reinforcing sleeve, and the diagonal brace and the node fixing seat are riveted and fixed by multiple sets of first rivets and second rivets.

[0007] As a further description of the above technical solution:

[0008] The inner wall of the node fixing seat is provided with a connecting cavity, and the inner cavity size is adapted to the outer dimensions of the diagonal rod.

[0009] As a further description of the above technical solution:

[0010] The node fixing seat and the diagonal bar are both in the shape of an I-beam, consisting of a set of vertical long sides and two sets of horizontal short sides located at both ends of the vertical long sides. The horizontal short sides of the node fixing seat and the horizontal short sides of the diagonal bar are fixed together by multiple sets of first rivets, and the vertical long sides of the node fixing seat and the vertical long sides of the diagonal bar are fixed together by multiple sets of second rivets.

[0011] As a further description of the above technical solution:

[0012] The first and second rivets in multiple sets are all stainless steel rivets.

[0013] As a further description of the above technical solution:

[0014] The first reinforcing rib structure includes multiple sets of vertical ribs. All sets of vertical ribs are arranged on the inner side wall of the node connecting pipe and are evenly distributed in a circle with the axis of the node connecting pipe as the center. The two ends of the length direction of the multiple sets of vertical ribs are respectively aligned with the two ends of the length direction of the node connecting pipe.

[0015] As a further description of the above technical solution:

[0016] The second reinforcing rib structure includes four sets of diagonal ribs. The four sets of diagonal ribs are respectively fixedly connected between the upper wall of the node fixing seat and the reinforcing sleeve, the lower wall of the node fixing seat and the reinforcing sleeve, the left wall of the node fixing seat and the reinforcing sleeve, and the right wall of the node fixing seat and the reinforcing sleeve. The node fixing seat is supported by the four sets of diagonal ribs.

[0017] As a further description of the above technical solution:

[0018] The node connecting pipe and the reinforcing sleeve, as well as the reinforcing sleeve and the node fixing seat, are all fixed by welding.

[0019] This utility model has the following beneficial effects:

[0020] 1. Compared with the existing technology, in this lightweight wind power truss tower connection node, when the diagonal bar is connected to the node connection pipe, the node connection pipe has its own strength improved by multiple sets of vertical ribs set on the inner side wall. At the same time, a reinforcing sleeve is welded on the outer wall of the node connection pipe. The strength of the node connection pipe is further improved by the reinforcing sleeve, thereby improving the stability of the connection.

[0021] 2. Compared with the existing technology, the lightweight wind power truss tower connection node has a node fixing seat with a connection cavity that matches the shape of the diagonal bar on the outer wall of the reinforcing sleeve. After the diagonal bar is inserted into the connection cavity, the vertical long side and the two sets of horizontal short sides of the I-shaped diagonal bar are riveted and fixed to the node fixing seat by multiple sets of second rivets and first rivets, respectively. That is, the end of the diagonal bar connected to the node connection pipe is fully surrounded and fixed, making the connection very stable. In addition, the outer wall of the node fixing seat is also provided with four sets of diagonal ribs, which further improves the connection stability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a lightweight wind turbine truss tower connection node proposed in this utility model;

[0023] Figure 2 This is a partial sectional view of the node fixing seat and diagonal brace section of a lightweight wind power truss tower connection node proposed in this utility model;

[0024] Figure 3 This is a partial sectional view of the node fixing seat of a lightweight wind power truss tower connection node proposed in this utility model.

[0025] Legend:

[0026] 1. Node connecting pipe; 2. Vertical rib; 3. Reinforcing sleeve; 4. Node fixing seat; 401. Connecting cavity; 5. Diagonal bar; 6. First rivet; 7. Second rivet; 8. Diagonal rib. Detailed Implementation

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Reference Figures 1 to 3 The present invention provides a lightweight wind power truss tower connection node, including a node connection pipe 1 and a diagonal bar 5; the connection node structure is consistent with that in the prior art. In this embodiment, the upper and lower ends of the node connection pipe 1 are connected to the tower, and the truss is connected to the node connection pipe 1 through the diagonal bar 5.

[0029] To improve the strength of the node connecting pipe 1, a first reinforcing rib structure is provided on the inner wall of the node connecting pipe 1 to improve the strength of the node connecting pipe 1. The first reinforcing rib structure includes multiple sets of vertical ribs 2, which are all provided on the inner wall of the node connecting pipe 1 and are distributed in a circular pattern with the axis of the node connecting pipe 1 as the center. The two ends of the length direction of the multiple sets of vertical ribs 2 are aligned with the two ends of the length direction of the node connecting pipe 1, and the multiple sets of vertical ribs 2 are supported from the internal docking point of the connecting pipe 1 to improve the structural strength.

[0030] To further improve the strength of the node connecting pipe 1, a reinforcing sleeve 3 is fixedly connected to the outer wall of the node connecting pipe 1. The node connecting pipe 1 and the reinforcing sleeve 3 are fixed by welding. The reinforcing sleeve 3 further improves the structural strength of the node connecting pipe 1 and increases its service life.

[0031] To achieve a surround-type fixation of the diagonal rod 5, a node fixing seat 4 is fixedly connected to the outer wall of the reinforcing sleeve 3, and the reinforcing sleeve 3 and the node fixing seat 4 are both fixed by welding. The diagonal rod 5 is located at the end of the node fixing seat 4 away from the reinforcing sleeve 3. The diagonal rod 5 and the node fixing seat 4 are fixed by riveting with multiple sets of first rivets 6 and second rivets 7. The inner wall of the node fixing seat 4 is provided with a connecting cavity 401, the inner size of which is adapted to the outer size of the diagonal rod 5. The cross-sections of the node fixing seat 4 and the diagonal rod 5 are both composed of a set of vertical long sides and two sets of vertical long sides respectively. The horizontal short sides at both ends form an I-shape. The horizontal short side of the node fixing seat 4 and the horizontal short side of the diagonal rod 5 are fixed by multiple sets of first rivets 6. The vertical long side of the node fixing seat 4 and the vertical long side of the diagonal rod 5 are fixed by multiple sets of second rivets 7. The multiple sets of first rivets 6 and second rivets 7 are all stainless steel rivets. Stainless steel rivets have the characteristics of corrosion resistance, high strength and long service life. After the diagonal rod 5 is inserted into the connecting cavity 401, it is riveted and fixed by multiple sets of first rivets 6 and second rivets 7, forming a surrounding fixation of the diagonal rod 5, which effectively improves the connection strength.

[0032] To improve the strength of the node fixing seat 4, a second reinforcing rib structure for supporting the node fixing seat 4 is provided between the node fixing seat 4 and the reinforcing sleeve 3. The second reinforcing rib structure includes four sets of diagonal ribs 8, which are respectively fixedly connected between the upper wall of the node fixing seat 4 and the reinforcing sleeve 3, between the lower wall of the node fixing seat 4 and the reinforcing sleeve 3, between the left wall of the node fixing seat 4 and the reinforcing sleeve 3, and between the right wall of the node fixing seat 4 and the reinforcing sleeve 3. The node fixing seat 4 is supported by the four sets of diagonal ribs 8, which greatly improves the strength of the node fixing seat 4 and forms an integral whole with the reinforcing sleeve 3 and the node connecting pipe 1.

[0033] Working principle: The top and bottom ends of the node connecting pipe 1 are connected to the tower. The truss is connected to the node connecting pipe 1 through the diagonal brace 5. Multiple sets of vertical ribs 2 support the node connecting pipe 1 from the internal joint point, improving the structural strength. The structural strength of the node connecting pipe 1 is further improved by the reinforcing sleeve 3, which increases its service life. The horizontal short side of the node fixing seat 4 is fixed to the horizontal short side of the diagonal brace 5 by multiple sets of first rivets 6, and the vertical long side of the node fixing seat 4 is fixed to the vertical long side of the diagonal brace 5 by multiple sets of second rivets 7. The multiple sets of first rivets 6 and second rivets 7 are all stainless steel rivets, which have the characteristics of corrosion resistance, high strength and long service life. After the diagonal brace 5 is inserted into the connecting cavity 401, it is fixed by multiple sets of first rivets 6 and second rivets 7, forming a surrounding fixation of the diagonal brace 5, which effectively improves the connection strength. The node fixing seat 4 is supported by four sets of diagonal ribs 8, which greatly improves the strength of the node fixing seat 4 and forms a whole with the reinforcing sleeve 3 and the node connecting pipe 1.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lightweight wind turbine truss-type tower connection node, characterized in that: The device includes a node connecting pipe (1) and a diagonal rod (5). The inner wall of the node connecting pipe (1) is provided with a first reinforcing rib structure for improving the strength of the node connecting pipe (1). A reinforcing sleeve (3) is fixedly connected to the outer wall of the node connecting pipe (1). A node fixing seat (4) is fixedly connected to the outer wall of the reinforcing sleeve (3). A second reinforcing rib structure for supporting the node fixing seat (4) is provided between the node fixing seat (4) and the reinforcing sleeve (3). The diagonal rod (5) is located at the end of the node fixing seat (4) away from the reinforcing sleeve (3). The diagonal rod (5) and the node fixing seat (4) are riveted and fixed by multiple sets of first rivets (6) and second rivets (7).

2. The lightweight wind turbine truss tower connection node according to claim 1, characterized in that: The inner wall of the node fixing seat (4) is provided with a connecting cavity (401), and the inner size of the connecting cavity (401) is adapted to the outer size of the diagonal bar (5).

3. A lightweight wind turbine truss tower connection node according to claim 2, characterized in that: The cross-sections of the node fixing seat (4) and the diagonal rod (5) are both in the shape of an I-shape, consisting of a set of vertical long sides and two sets of horizontal short sides located at both ends of the vertical long sides. The horizontal short sides of the node fixing seat (4) and the horizontal short sides of the diagonal rod (5) are fixed together by multiple sets of first rivets (6), and the vertical long sides of the node fixing seat (4) and the vertical long sides of the diagonal rod (5) are fixed together by multiple sets of second rivets (7).

4. A lightweight wind turbine truss tower connection node according to claim 3, characterized in that: The first rivet (6) and the second rivet (7) in multiple sets are all stainless steel rivets.

5. A lightweight wind turbine truss tower connection node according to claim 4, characterized in that: The first reinforcing rib structure includes multiple sets of vertical ribs (2). The multiple sets of vertical ribs (2) are all set on the inner side wall of the node connecting pipe (1) and are distributed in a circular pattern with the axis of the node connecting pipe (1) as the center. The two ends of the length direction of the multiple sets of vertical ribs (2) are respectively aligned with the two ends of the length direction of the node connecting pipe (1).

6. A lightweight wind turbine truss tower connection node according to claim 5, characterized in that: The second reinforcing rib structure includes four sets of diagonal ribs (8). The four sets of diagonal ribs (8) are respectively fixedly connected between the upper wall of the node fixing seat (4) and the reinforcing sleeve (3), between the lower wall of the node fixing seat (4) and the reinforcing sleeve (3), between the left wall of the node fixing seat (4) and the reinforcing sleeve (3), and between the right wall of the node fixing seat (4) and the reinforcing sleeve (3). The node fixing seat (4) is supported by the four sets of diagonal ribs (8).

7. A lightweight wind turbine truss tower connection node according to claim 6, characterized in that: The node connecting pipe (1) and the reinforcing sleeve (3) are fixed together by welding as are the reinforcing sleeve (3) and the node fixing seat (4).

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