Bolt anti-falling structure for wind turbine generator

Abstract

The utility model discloses a bolt anti-falling structure for a wind turbine generator. The bolt anti-falling structure comprises a variable pitch bearing, a fan blade and a fastening assembly. Wherein an embedded part is arranged at the root of the fan blade; the fastening assembly comprises a first fastening piece which penetrates into the inner ring of the variable pitch bearing and is connected with the embedded part, and a second fastening piece for fixing the first fastening piece; and meanwhile, connecting pieces are arranged between the adjacent first fastening pieces so as to realize integral fixation. According to the bolt anti-falling structure for the wind turbine generator, the adjacent first fastening pieces are continuously fixed through the connecting pieces, the situation that one or more sets of first fastening pieces fall off after deformation and fracture is effectively prevented, secondary damage to a hub is avoided, and the service life of the hub is prolonged. In the period that the connecting piece can bear the maximum number of first fasteners and possibly fall off at the same time, field operation and maintenance personnel carry out regular inspection work, regularly inspect the condition of the wind turbine generator and timely process the broken first fasteners so as to avoid secondary damage, and the operation and maintenance management workload of equipment is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, specifically to a bolt anti-loosening structure for wind turbine units. Background Technology

[0002] Currently, wind turbine blades typically use studded bolts to connect the blades to the pitch bearings. Since these studded bolts are not fully threaded, when the connection between the studded bolt and the fastening nut at the blade end deforms and breaks, the studded bolt will quickly detach and fall into the hub. Because some in-service wind turbines lack bolt detachment detection devices, the detached studded bolt will not trigger a turbine alarm or shutdown. The broken bolt and nut will then impact the pitch hydraulic components and other still-connected studded bolts inside the hub during turbine operation, causing serious secondary damage, ultimately leading to component damage and turbine shutdown, severely threatening the safe operation of the turbine. Therefore, this utility model aims to propose a bolt detachment prevention structure for wind turbines. Utility Model Content

[0003] In order to overcome the technical problems described in the prior art, the purpose of this utility model is to provide a bolt anti-loosening structure for wind turbines.

[0004] This utility model discloses a bolt anti-loosening structure for wind turbine units, comprising:

[0005] Pitch bearings; wind turbine blades with embedded parts at their roots; and...

[0006] The fastening assembly includes a first fastener that passes through the inner ring of the pitch bearing and is connected to the embedded part, and a second fastener for securing the first fastener.

[0007] Connectors are provided between several adjacent first fasteners to achieve overall fixation.

[0008] As a preferred technical solution, the embedded part is a pre-embedded installation nut, the first fastener is a double-ended bolt, and the second fastener is an anti-loosening nut.

[0009] As a preferred technical solution, any of the connectors has 3 to 5 sets of mounting through holes to allow the corresponding number of the first fasteners to be fixed as a whole.

[0010] As a preferred technical solution, all the first fasteners of the inner ring of the pitch bearing are covered by the connecting member.

[0011] As a preferred technical solution, the connector is a connecting piece with a thickness of 2-3mm.

[0012] As a preferred technical solution, the connector is made of galvanized steel.

[0013] As a preferred technical solution, the connector is disposed inside the second fastener, and the second fastener simultaneously fixes the first fastener and the connector.

[0014] As a preferred technical solution, the fastening assembly further includes a third fastener, the connector is disposed outside the second fastener, and the third fastener is used to fix the connector.

[0015] In summary, this utility model has the following technical effects:

[0016] This utility model discloses a bolt anti-loosening structure for wind turbines, comprising a pitch bearing, wind turbine blades, and fastening components. An embedded part is disposed at the root of the wind turbine blade. The fastening components include a first fastener that penetrates the inner ring of the pitch bearing and connects to the embedded part, and a second fastener for fixing the first fastener. Connectors are disposed between several adjacent first fasteners to achieve overall fixation. This bolt anti-loosening structure for wind turbines, by continuously fixing several adjacent first fasteners with connecting parts, effectively prevents single or multiple sets of first fasteners from deforming and breaking, thus avoiding secondary damage to the hub. Within the period during which the connecting parts can withstand the maximum number of first fasteners potentially falling off simultaneously, on-site maintenance personnel can conduct regular inspections, regularly check the condition of the wind turbine, and promptly address any broken first fasteners to prevent secondary damage, effectively reducing the workload of equipment maintenance. Therefore, compared with existing wind turbine technology, the bolt anti-loosening structure for wind turbines provided by this utility model has significant technical advantages. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a plan view of a set of connectors provided in some embodiments;

[0019] Figure 2 This is a planar schematic diagram of multiple sets of connectors spliced ​​together according to some embodiments;

[0020] Figure 3 This is an installation diagram of a set of connectors provided in some embodiments;

[0021] The meanings of the reference numerals in the attached figures are as follows:

[0022] 1- Pitch bearing;

[0023] 2-First fastener;

[0024] 3-Connector, 31-Mounting through hole. Detailed Implementation

[0025] The technical solution of this embodiment will be clearly and completely described below with reference to the accompanying drawings. The embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Therefore, it should be understood that various modifications and changes can be made to this embodiment without departing from the scope of protection of this utility model.

[0026] In the description of this invention, unless otherwise expressly specified and limited, the term "and / or" includes any and all combinations of one or more of the associated listed items. Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly; for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Furthermore, in the description of this utility model, it should be understood that the directional terms described in this embodiment are used to describe the angles shown in the accompanying drawings and should not be construed as limiting this embodiment. It should also be understood that, in the context, when an element or feature is mentioned as being connected to another element (one or more), it can be connected not only directly to the other element (one or more) but also indirectly to the other element (one or more) through an intermediate element.

[0028] Before introducing the technical solution of this utility model, it is necessary to explain the background of its invention. Currently, wind turbine blades typically use double-ended studs to connect the blades to the pitch bearings. These studs are not fully threaded. When the connection between the stud and the blade end fastening nut deforms and breaks, the stud will quickly fall into the hub. Since some in-service wind turbines lack bolt detachment detection devices, the detached stud will not trigger a turbine alarm or shutdown. The broken bolt and nut will impact the pitch hydraulic components and other still-connected studs inside the hub during turbine operation, causing serious secondary damage, eventually leading to turbine failure and shutdown, severely threatening the safe operation of the turbine. Therefore, this utility model aims to propose a bolt detachment prevention structure for wind turbines.

[0029] Please see Figures 1 to 3An exemplary embodiment of this utility model provides a bolt anti-loosening structure for wind turbines, including a pitch bearing 1, wind turbine blades, and fastening components. An embedded part is disposed at the root of the wind turbine blades. The fastening components include a first fastener 2 that penetrates the inner ring of the pitch bearing 1 and connects to the embedded part, and a second fastener for fixing the first fastener 2. Connecting parts 3 are disposed between several adjacent first fasteners 2 to achieve overall fixation. The bolt anti-loosening structure for wind turbines, using the above structure, continuously fixes several adjacent first fasteners 2 through the connecting parts 3, effectively preventing single or multiple sets of first fasteners 2 from deforming and breaking, thus avoiding secondary damage to the hub. Within the period during which the connecting parts 3 can withstand the maximum number of first fasteners 2 that may simultaneously fall off, on-site maintenance personnel can conduct regular inspections, regularly check the condition of the wind turbine, and promptly address any broken first fasteners 2 to prevent secondary damage, effectively reducing the workload of equipment maintenance and management.

[0030] The following is a detailed description of connector 3:

[0031] As a preferred technical solution, any connector 3 has 3 to 5 sets of mounting through holes 31 to allow a corresponding number of first fasteners 2 to be fixed together. It should be noted that the accompanying drawings of this embodiment show one connector 3 with 4 sets of mounting through holes 31 as an example. Depending on the anti-loosening level of the fasteners used, this four-hole connector 3 can withstand the simultaneous detachment of one to three first fasteners. Further details can be found in the attached drawings. Figure 2 Several connecting pieces 3 are spliced ​​together to form a ring structure corresponding to the inner ring of the bearing, which can cover all the first fasteners 2 of the inner ring of the pitch bearing 1. In addition, the connecting piece 3 is a connecting piece with a thickness of 2-3mm and is made of galvanized steel, so that the connecting piece 3 can ensure a certain strength and corrosion resistance, while minimizing the operating load on the wind turbine blades.

[0032] It should be noted that the embedded part is a pre-embedded installation nut, the first fastener 2 is a double-ended bolt, that is, both ends are threaded, and the second fastener is a lock nut. Preferably, the tensile strength of the double-ended bolt is not less than 800 MPa, so as to meet the tensile force requirements when multiple sets of first fasteners 2 break.

[0033] Preferably, the present invention has the following two installation structures:

[0034] 1. Connector 3 is located inside the second fastener: The second fastener simultaneously fixes the first fastener 2 and connector 3. The specific installation method is as follows: During installation, first, the mounting nut is pre-embedded at the blade root. Then, one end of the double-ended bolt is connected to the mounting nut along the blade axial direction, and the other end passes through the inner ring of the pitch bearing 1 and connects to connector 3, and then to the anti-loosening nut. It should be understood that a hydraulic tensioning tool should be used to tighten it to the preset torque value. It should be understood that this installation structure is suitable for the initial installation of wind turbine units.

[0035] 2. Connector 3 is located outside the second fastener: The fastening assembly also includes a third fastener. The specific installation method is as follows: During installation, first, the mounting nut is pre-embedded at the blade root. Then, one end of the double-ended bolt is connected to the mounting nut along the blade axial direction, and the other end passes through the inner ring of the pitch bearing 1 and is connected to the anti-loosening nut. Next, connector 3 is fitted onto the outermost end of the double-ended bolt and secured by the third fastener. Similarly, a hydraulic tensioning tool is used to tighten it to the preset torque value. It should be understood that this installation structure is suitable for improving existing wind turbine units.

[0036] In addition, as a preferred technical solution, a bolt detachment detection device is also provided in the bolt anti-detachment structure for wind turbines of this utility model. The detached double-headed bolts trigger the wind turbine to alarm or stop in time through this bolt detachment detection device, so as to carry out equipment operation and maintenance management.

[0037] In summary, the bolt anti-loosening structure for wind turbines of this invention avoids the need for shutdown and maintenance due to the deformation and detachment of a single bolt. Instead, on-site maintenance personnel can conduct regular inspections only within the period during which the maximum number of first fasteners 2 that the connector 3 can withstand may simultaneously detach. This reduces the failure rate of the pitch system, narrows the scope of failures caused by bolt deformation and breakage, improves the reliability of wind farm equipment operation, and reduces the time required to handle secondary damage-related failures. Therefore, compared to existing wind turbine technologies, the bolt anti-loosening structure for wind turbines provided by this invention has significant technical advantages.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bolt anti-loosening structure for wind turbine generators, characterized in that, include: Pitch bearing; The wind turbine blades have embedded parts at their roots; as well as, The fastening assembly includes a first fastener that passes through the inner ring of the pitch bearing and is connected to the embedded part, and a second fastener for fixing the first fastener. Connectors are provided between several adjacent first fasteners to achieve overall fixation.

2. The bolt anti-loosening structure according to claim 1, characterized in that, The embedded part is a pre-embedded installation nut, the first fastener is a double-ended bolt, and the second fastener is a lock nut.

3. The bolt anti-loosening structure according to claim 2, characterized in that, Each of the connectors has 3 to 5 sets of mounting through holes to allow the corresponding number of the first fasteners to be fixed together.

4. The bolt anti-loosening structure according to claim 3, characterized in that, All the first fasteners on the inner ring of the pitch bearing are covered by the connecting member.

5. The bolt anti-loosening structure according to claim 4, characterized in that, The connector is a 2-3mm thick connecting piece.

6. The bolt anti-loosening structure according to claim 5, characterized in that, The connector is made of galvanized steel.

7. The bolt anti-loosening structure according to any one of claims 1-6, characterized in that, The connector is located inside the second fastener, and the second fastener simultaneously fixes the first fastener and the connector.

8. The bolt anti-loosening structure according to any one of claims 1-6, characterized in that, The fastening assembly further includes a third fastener, the connector being disposed outside the second fastener, and the third fastener being used to fix the connector.

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