Local reinforcing flange of variable pitch bearing of wind driven generator

Abstract

The utility model relates to a local reinforcing flange of a variable pitch bearing of a wind driven generator. The local reinforcing flange is in an arc shape. The local reinforcing flange comprises a plurality of arc sections arranged in the arc direction of the local reinforcing flange, and the thickness of each arc section is gradually reduced from the middle to the two ends. Each arc section comprises a first surface and a second surface which are opposite to each other, and the first surfaces of the arc sections are coplanar, so that one surface of the local reinforcing flange forms a continuous plane; each arc section is provided with a first through hole. According to the utility model, the installation difficulty of the flange can be reduced, the increased load of the impeller system is reduced, the safety in the construction process is improved, and the overall construction cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbines, and in particular to a local reinforced flange of a variable pitch bearing of a wind turbine. Background Art

[0002] A wind turbine is a large-scale power generation device that converts wind energy into electrical energy through the rotation of blades. The blades are connected to the hub through pitch bearings. During the operation of the wind turbine, cracks may occur in the inner or outer ring of the pitch bearing, and the cage may deform or break. The pitch bearing itself is not repairable and the replacement cost is extremely high. At present, the industry generally adopts the installation of a reinforced flange ring on the end face of the pitch bearing to improve the strength and rigidity of the pitch bearing, thereby increasing the service life of the pitch bearing.

[0003] The traditional method is to use an integral annular flange to reinforce the variable pitch bearing. However, this will require the removal of the blades before installing the flange, and it also requires large lifting equipment, which makes the construction difficult, demanding, and expensive. In order to reduce the difficulty of construction, the utility model with announcement number CN209041031U proposes a segmented variable pitch bearing reinforcement flange for wind turbines, which uses a two-section flange for assembly. Although it reduces the requirements for lifting equipment to a certain extent, when installing one section of the flange, it is necessary to unload half of the connecting bolts between the variable pitch bearing and the hub, and the equipment safety during the construction process is extremely low; and the reinforcement flange provided by the utility model is still a complete ring after installation. Not only is the overall weight large, which increases the load on the variable pitch bearing, but it also has the defects of high construction difficulty and high cost. Utility Model Content

[0004] Based on this, it is necessary to provide a local reinforced flange for a wind turbine pitch bearing, and its specific technical solution is as follows.

[0005] A local reinforced flange of a wind turbine pitch bearing, wherein the local reinforced flange is in an arc shape;

[0006] The local reinforcement flange includes a plurality of arc segments arranged along the arc direction thereof, and the thickness of each arc segment gradually decreases from the middle to both ends;

[0007] The arc segment comprises a first surface and a second surface opposite to each other, and the first surfaces of the arc segments are coplanar, so that one surface of the local reinforcement flange forms a continuous plane;

[0008] Each arc segment is respectively provided with a first through hole.

[0009] Furthermore, rounded corners are formed between adjacent arc segments.

[0010] Furthermore, the pitch bearing and the hub are connected by connecting bolts, and the position of the first through hole corresponds to the position of the connecting bolts.

[0011] Furthermore, the curvature of the local reinforcement flange is not less than the curvature formed by 6 consecutive connecting bolts and not greater than the curvature formed by 12 consecutive connecting bolts.

[0012] Furthermore, the curvature of the local reinforcement flange is 60°.

[0013] Furthermore, the curvature of each arc segment gradually decreases from the middle to both ends.

[0014] Furthermore, the arc segment is divided into a main arc segment located in the middle, and sub-arc segments located on both sides of the main arc segment, and the curvature and thickness of the sub-arc segments on both sides of the main arc segment are symmetrical.

[0015] Furthermore, when the mounting hole of the pitch bearing corresponding to the connecting bolt is a through hole, the continuous plane of the local reinforcement flange fits the end face of the pitch bearing, and the connecting bolt passes through the first through hole to lock the local reinforcement flange.

[0016] Furthermore, when the mounting block of the pitch bearing corresponding to the connecting bolt is a blind hole, the blind hole penetrates the pitch bearing to form a second through hole, the continuous plane of the local reinforcement flange fits with the end face of the pitch bearing, and the connecting bolt passes through the second through hole and the first through hole in sequence to lock the local reinforcement flange.

[0017] Furthermore, the local reinforcement flange is mounted on the inner ring end face or the outer ring end face of the pitch bearing.

[0018] Beneficial effects: The utility model provides a locally reinforced flange for a variable pitch bearing of a wind turbine, which locally reinforces the variable pitch bearing and greatly reduces the size of the flange, thereby reducing the requirements for lifting equipment, reducing the difficulty of installation, and thus reducing costs. In addition, by reducing the size of the flange, the mass of the flange is reduced, and by designing a multi-arc segment structure that is thick in the middle and thin at both ends, the thickest arc segment in the middle is used to reinforce the weak position of the variable pitch bearing, ensuring that there are sufficient connection nodes between the locally reinforced flange and the variable pitch bearing, while further reducing the weight of the locally reinforced flange, thereby reducing the load on the variable pitch bearing. In addition, by reducing the size of the flange, the number of connection nodes on the variable pitch bearing that need to be disassembled when installing the locally reinforced flange is reduced, thereby improving safety during the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a local reinforced flange;

[0021] Figure 2 This is the thickness view of the locally reinforced flange;

[0022] Figure 3 This is a cross-sectional view after the local reinforcement flange is installed;

[0023] Figure 4 It is a schematic diagram of installing a local reinforcement flange when the mounting hole on the pitch bearing is a through hole;

[0024] Figure 5 A schematic diagram of a modified pitch bearing with a blind hole as the mounting hole;

[0025] Figure 6 It is a schematic diagram of installing a local reinforcement flange when the mounting hole on the pitch bearing is a blind hole.

[0026] Explanation of the accompanying drawings: 1. Main arc segment; 2. Sub-arc segment; 3. First surface; 4. Second surface; 5. First through hole; 6. Fillet; 7. Paddle bearing; 8. Connecting bolt; 9. Hub; 11. Blind hole; 12. Second through hole; 13. Local reinforcement flange. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0033] Example

[0034] Reference Figure 1 As shown, this embodiment provides a local reinforcement flange of a wind turbine variable pitch bearing. The local reinforcement flange 13 is in an arc shape, that is, the local reinforcement flange 13 is a non-integral circular ring structure and can be used alone when used to strengthen the variable pitch bearing 7. Figure 2 As shown, specifically, the local reinforcement flange 13 includes a plurality of arc segments arranged along the arc direction, and the thickness of each arc segment gradually decreases from the middle to the two ends. The local reinforcement flange 13 specifically includes a main arc segment 1 located in the middle position, and sub-arc segments 2 located on both sides of the main arc segment 1. The main arc segment 1 has symmetrically arranged sub-arc segments 2 on both sides, that is, the number of sub-arc segments 2 on both sides of the main arc segment 1 is equal, and the thickness and curvature correspond one to one. Each of the arc segments includes a first face 3 and a second face 4 opposite to each other, and the first face 3 of each arc segment is coplanar, so that one side of the local reinforcement flange 13 forms a continuous plane, and when the local reinforcement flange 13 is installed, the continuous plane is made to fit with the end face of the pitch bearing 7. On the other side of the local reinforcement flange 13, a stepped structure is formed due to the different thicknesses of each arc segment. When strengthening the pitch bearing 7, the thickest main arc segment 1 in the middle is aligned with the weak position of the pitch bearing 7 to strengthen the weak position; by setting the gradually thinning sub-arc segment 2, sufficient connection nodes are provided for the pitch bearing 7 and the local reinforcement flange 13, and the thickness of the local reinforcement flange 13 is reduced, thereby reducing the additional load on the pitch bearing 7. In addition, the relatively thin sub-arc segment 2 generates less reaction force on the pitch bearing 7 than the main arc segment 1. The first through hole 5 is respectively provided on each of the arc segments, and the connecting bolt 8 between the pitch bearing 7 and the hub 9 passes through the first through hole 5 to lock the local reinforcement flange 13, thereby realizing the installation of the local reinforcement flange 13.

[0035] The local reinforced flange of the variable pitch bearing of a wind turbine provided in this embodiment locally reinforces the variable pitch bearing 7, greatly reducing the size of the flange, thereby reducing the requirements for hoisting equipment, reducing the difficulty of installation, and thus reducing costs. In addition, by reducing the size of the flange, the mass of the flange is reduced, and by designing a multi-arc segment structure that is thick in the middle and thin at both ends, the thickest arc segment in the middle is used to reinforce the weak position of the variable pitch bearing 7, ensuring that there are sufficient connection nodes between the local reinforced flange 13 and the variable pitch bearing 7, while further reducing the weight of the local reinforced flange 13, thereby reducing the load of the variable pitch bearing 7.

[0036] Specifically, fillets 6 are formed between adjacent arc segments to reduce stress concentration between adjacent arc segments.

[0037] Specifically, refer to Figure 3 As shown, the pitch bearing 7 and the hub 9 are connected by connecting bolts 8. The positions of the first through holes 5 correspond to the positions of the connecting bolts 8. The local reinforcement flange 13 is locked by the connecting bolts 8. There is no need to add additional connecting structures, which reduces the construction difficulty.

[0038] In this embodiment, the curvature of the local reinforcement flange 13 can be designed to be not less than the curvature formed by 6 consecutive connecting bolts 8 and not more than the curvature formed by 12 consecutive connecting bolts 8. Conventionally, the interval curvature of adjacent connecting bolts 8 on the pitch bearing 7 is 6°, that is, the curvature of adjacent first through holes 5 is 6°. The curvature of the local reinforcement flange 13 can be set to have a corresponding curvature of 6 to 12 first through holes 5, ensuring that sufficient connection nodes can be provided between the reinforcement flange and the pitch bearing 7, while reducing the size of the local reinforcement flange 13 as much as possible. Specifically, in this embodiment, the curvature of the local reinforcement flange 13 is selected to be 60°, and the number of the first through holes 5 is 10.

[0039] It should be noted that, in this embodiment, the local reinforcement flange 13 can be installed on the non-assembly end surface of the inner ring or outer ring of the pitch bearing 7 according to the installation method between the pitch bearing 7, the blade, and the hub 9. In the figure shown in this embodiment, the local reinforcement flange 13 is installed on the outer ring of the pitch bearing 7. In other embodiments, the local reinforcement flange 13 can also be installed on the outer ring of the pitch bearing 7. When the local reinforcement flange 13 is installed on the outer ring of the pitch bearing 7, the outer diameter of the local reinforcement flange 13 is equal to or greater than the outer diameter of the outer ring of the pitch bearing 7, and the inner diameter of the local reinforcement flange 13 is equal to or slightly smaller than the inner diameter of the outer ring of the pitch bearing 7, so that the local reinforcement flange can be normally attached to the end surface of the pitch bearing 7 without interfering with other equipment.

[0040] Specifically, in this embodiment, the curvature of each arc segment gradually decreases from the middle to both ends. Four first through holes 5 are provided on the main arc segment 1, two first through holes 5 are provided on the first sub-arc segment 2 adjacent to the main arc segment 1, and one first through hole 5 is provided on the second sub-arc segment 2 adjacent to the main arc segment 1. By reducing the curvature of the sub-arc segment 2, the size of the local reinforcement flange 13 is further reduced.

[0041] Specifically, the mounting holes of the pitch bearing 7 corresponding to the connecting bolts 8 can be divided into through holes and blind holes 11 .

[0042] Reference Figure 4 As shown, when the mounting hole on the pitch bearing 7 is a through hole, the continuous plane of the local reinforcement flange 13 is directly fitted with the end face of the pitch bearing 7, and the connecting bolt 8 is passed through the first through hole 5 and connected with the nut to lock the local reinforcement flange 13. Usually, the pitch bearing 7 includes two symmetrical soft belt positions, which are the weak positions of the pitch bearing 7. The local reinforcement flanges 13 are respectively installed at the two soft belt positions, and the two local reinforcement flanges 13 are symmetrically arranged.

[0043] Reference Figure 5 As shown, when the mounting hole on the pitch bearing 7 is a blind hole 11, the blind hole 11 is modified so that the blind hole 11 penetrates the pitch bearing 7 to form a second through hole 12. Figure 5 In the figure, the left side is the modified second through hole 12, and the right side is the unmodified blind hole 11. Figure 6 As shown, after the blind hole 11 is modified, the continuous plane of the local reinforcement flange 13 is fitted with the end face of the pitch bearing 7, and the connecting bolt 8 passes through the second through hole 12 and the first through hole 5 in sequence to lock the local reinforcement flange 13. It should be noted that this method only illustrates the case where the hub 9 has a mounting through hole and the pitch bearing 7 has a blind hole 11. When the hub 9 has a blind hole 11 and the pitch bearing 7 has a through hole, the local reinforcement flange 13 provided in this embodiment can also be used for reinforcement.

[0044] The local reinforced flange of the variable pitch bearing of a wind turbine provided in this embodiment reduces the requirements for hoisting equipment, avoids the use of large cranes, reduces the difficulty of construction, reduces the construction cost to 1 / 5-1 / 6 of the original, and greatly improves the economy. During the installation of the local reinforced flange 13, it is only necessary to remove the connecting bolts 8 corresponding to the local reinforced flange 13, that is, to install a local reinforced flange 13, it is only necessary to remove about 1 / 6 of the connecting bolts 8, which improves the safety during the construction process. In addition, the local reinforced flange 13 provided in this embodiment reduces the amount of flange material compared to the prior art, thereby reducing the load added to the impeller system, and the added weight is only about 1 / 3 of the prior art, which greatly reduces the impact of the added weight on the overall operating safety and economy of the wind turbine. In summary, the cost required for using the local reinforced flange 13 provided in this embodiment is at least reduced to about 1 / 3 of the cost required by the prior art.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A local reinforced flange of a wind turbine pitch bearing, characterized in that: The local reinforcement flange is in an arc shape; The local reinforcement flange includes a plurality of arc segments arranged along the arc direction thereof, and the thickness of each arc segment gradually decreases from the middle to both ends; The arc segment comprises a first surface and a second surface opposite to each other, and the first surfaces of the arc segments are coplanar, so that one surface of the local reinforcement flange forms a continuous plane; Each arc segment is respectively provided with a first through hole.

2. The local reinforced flange of a wind turbine pitch bearing according to claim 1, characterized in that: Fillets are formed between adjacent arc segments.

3. The local reinforced flange of a wind turbine pitch bearing according to claim 1, characterized in that: The pitch bearing and the hub are connected by connecting bolts, and the position of the first through hole corresponds to the position of the connecting bolts.

4. The local reinforced flange of a wind turbine pitch bearing according to claim 3, characterized in that: The curvature of the local reinforcement flange is not less than the curvature formed by 6 consecutive connecting bolts and not greater than the curvature formed by 12 consecutive connecting bolts.

5. The local reinforced flange of a wind turbine pitch bearing according to claim 1, characterized in that: The arc of the local reinforcement flange is 60°.

6. The local reinforced flange of a wind turbine pitch bearing according to claim 1, characterized in that: The curvature of each arc segment gradually decreases from the middle to both ends.

7. The local reinforced flange of a wind turbine pitch bearing according to claim 1, characterized in that: The arc segment is divided into a main arc segment located in the middle and sub-arc segments located on both sides of the main arc segment. The curvature and thickness of the sub-arc segments on both sides of the main arc segment are symmetrical.

8. The local reinforced flange of a wind turbine pitch bearing according to claim 1, characterized in that: When the mounting hole of the pitch bearing corresponding to the connecting bolt is a through hole, the continuous plane of the local reinforcement flange fits with the end face of the pitch bearing, and the connecting bolt passes through the first through hole to lock the local reinforcement flange.

9. The local reinforced flange of a wind turbine pitch bearing according to claim 1, characterized in that: When the mounting block of the pitch bearing corresponding to the connecting bolt is a blind hole, the blind hole penetrates the pitch bearing to form a second through hole, the continuous plane of the local reinforcement flange fits with the end face of the pitch bearing, and the connecting bolt passes through the second through hole and the first through hole in sequence to lock the local reinforcement flange.

10. A local reinforced flange for a wind turbine pitch bearing according to any one of claims 1 to 9, characterized in that: The local reinforcement flange is mounted on the inner ring end face or the outer ring end face of the pitch bearing.

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