CN219827413U

CN219827413U - Anti-fatigue stud and blade root connecting structure of wind driven generator

Info

Publication number: CN219827413U
Application number: CN202320475756.6U
Authority: CN
Inventors: 余岫卷; 陈铁锋; 韩鲁明; 贲晨阳
Original assignee: Envision Energy Co Ltd
Current assignee: Envision Energy Co Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-10-13
Anticipated expiration: 2033-03-14

Abstract

The utility model relates to an anti-fatigue stud and blade root connecting structure of a wind driven generator, which comprises a stud body (1), wherein one end of the stud body (1) is a blind hole thread matching end, and the other end is a nut matching end; the blind hole thread matching end is inconsistent with the thread type arranged on the nut matching end. Compared with the prior art, one end of the double-end stud designed by the utility model is in threaded fit with the blind hole, and the other end of the double-end stud is in fit with the nut to form a connecting pair. In the threaded connection structure, the external load bearing endurance of different threads is different, for example, the connection endurance of 3 threads of M threads, MJ threads and Rd threads is sequentially increased. The problem of bolt failure of stock fan products at key joints can be solved by using the double-end stud by utilizing the high-endurance thread pair.

Description

Anti-fatigue stud and blade root connecting structure of wind driven generator

Technical Field

The utility model relates to the technical field of studs, in particular to an anti-fatigue stud and blade root connecting structure of a wind driven generator.

Background

The wind driven generator is an electric power device which converts wind energy into mechanical work and drives a rotor to rotate and finally outputs alternating current. The hub is a core component of the wind driven generator and is used for rotatably carrying the blades and the components such as the pitch bearing of the blades so as to generate electric energy. Pitch bearings are one of the key components in wind turbines that are used to change the pitch angle of the wind turbine blades to facilitate power generation.

In the prior art, the following two solutions are often adopted in the face of fatigue failure of bolts used for connecting a pitch bearing and a blade, and between a hub and the pitch bearing: firstly, the operation and maintenance replacement times are increased, and the normal connection of the connection pair is ensured; and secondly, the secondary processing improvement is carried out in the factory, and the connection pair needs to be redesigned. However, the above solution is difficult to assemble and disassemble and is expensive.

Disclosure of Invention

The utility model aims to overcome at least one of the defects in the prior art and provide an anti-fatigue stud and wind driven generator blade root connecting structure. One end of the double-end stud is in threaded fit with the blind hole, and the other end of the double-end stud is in fit with the nut to form a connecting pair. In the threaded connection structure, the bearing external load endurance of different threads is different, and the problem of bolt failure of stock fan products at key connection positions can be solved by utilizing a high endurance screw pair by using a double-end stud.

The aim of the utility model can be achieved by the following technical scheme:

the utility model aims at providing an anti-fatigue stud, which comprises a stud body, wherein one end of the stud body is a blind hole thread matching end, and the other end of the stud body is a nut matching end; the blind hole thread matching end is inconsistent with the thread type arranged on the nut matching end.

Further, the threads arranged at the blind hole thread matching end are first threads, and the threads arranged at the nut matching end are second threads; the thread profile of the first thread and the second thread is one of triangle, trapezoid, zigzag or circular arc.

Further, the thread profile of the first thread and the second thread is one of trapezoid, zigzag or circular arc.

Further, the thread profile of the first thread and the second thread is one of zigzag or circular arc.

Further, the thread profile of the first thread and the second thread is one of circular arcs.

Further, the nominal diameters of the first thread and the second thread are the same.

Further, the nominal diameters of the first thread and the second thread are different.

Further, the blind hole internal thread is an M thread, and the first thread is an M thread or an MJ thread; the second thread is an Rd thread. In the threaded connection structure, the external load bearing endurance of different threads is different, for example, the connection endurance of 3 threads of M threads, MJ threads and Rd threads is sequentially increased. The problem of bolt failure of stock fan products at key joints can be solved by using the double-end stud by utilizing the high-endurance thread pair.

The second purpose of the utility model is to provide a blade root connecting structure of a wind driven generator, which comprises blades, a blade root flange, a pitch bearing outer ring nut, a hub, a pitch bearing inner ring nut, a pitch bearing and 2 anti-fatigue studs.

Further, the blade root flange and the variable-pitch bearing are connected in a matched manner through an anti-fatigue stud and a variable-pitch bearing outer ring nut; the hub and the variable-pitch bearing are connected with the inner ring nut of the variable-pitch bearing in a matched manner through an anti-fatigue stud.

Compared with the prior art, one end of the double-end stud designed by the utility model is in threaded fit with the blind hole, and the other end of the double-end stud is in fit with the nut to form a connecting pair. In the threaded connection structure, the external load bearing endurance of different threads is different, for example, the connection endurance of 3 threads of M threads, MJ threads and Rd threads is sequentially increased. The problem of bolt failure of stock fan products at key joints can be solved by using the double-end stud by utilizing the high-endurance thread pair.

Drawings

FIG. 1 is a schematic view of a twin-screw in an embodiment;

FIG. 2 is an elevation view of a double-ended screw in an embodiment;

FIG. 3 is an enlarged schematic view of area A of FIG. 2;

FIG. 4 is an enlarged schematic view of region B of FIG. 2;

FIG. 5 is a schematic illustration of a blade root connection configuration of a wind turbine in an embodiment;

the reference numerals in the figures indicate: 1-a stud body; 2-a first thread; 3-second threads; 100-blades, 101-embedded bolt sleeves; 102-blade root bolts; 103-blade root flange; 104-a pitch bearing outer ring nut; 105-pitch bearing hub bolts, 106-hubs, 107-pitch bearing inner ring nuts and 108-pitch bearings.

Detailed Description

The utility model will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present utility model, and a detailed implementation manner and a specific operation process are provided, but the protection scope of the present utility model is not limited to the following embodiments.

Examples

As shown in fig. 1, an anti-fatigue stud comprises a stud body 1, wherein one end of the stud body 1 is a blind hole thread matching end, and the other end is a nut matching end; the thread types arranged on the blind hole thread matching end and the nut matching end are inconsistent. The threads arranged at the threaded matching end of the blind hole are first threads 2, and the threads arranged at the threaded matching end of the nut are second threads 3; the nominal diameters of the first thread 2 and the second thread 3 are the same.

As shown in fig. 5, a blade root connection structure of a wind driven generator comprises a blade 100, a blade root flange 103, a pitch bearing outer ring nut 104, a hub 106, a pitch bearing inner ring nut 107, a pitch bearing 108, an embedded bolt sleeve 101, a blade root bolt 102 and a pitch bearing hub bolt 105. Wherein the blade root bolts 102 and the pitch bearing hub bolts 105 are the fatigue resistant studs described above.

The embedded bolt sleeve 101 is embedded into the root of the blade 100 and is in threaded connection with the blade root bolt 102. The blade 100, the blade root flange 103 and the pitch bearing 108 are matched and connected with the pitch bearing outer ring nut 104 through the blade root bolts 102; the hub 106 and the pitch bearing 108 are connected in a matched manner through a pitch bearing hub bolt 105 and a pitch bearing inner ring nut 107.

The blind hole end internal threads of the hub 106 and the embedded bolt sleeve are M threads, the blind hole thread matching ends of the blade root bolt 102 and the variable pitch bearing hub bolt 105 can be matched with the bolt sleeve internal threads by using M threads or MJ threads, and the nut matching ends can be used by using Rd threads and matched nuts, as shown in figures 2-4.

Working principle:

one end of the double-end stud in the embodiment is in threaded fit with the blind hole, and the other end of the double-end stud is in threaded fit with the nut to form a connecting pair. In the threaded connection structure, the external load bearing endurance of different threads is different, for example, the connection endurance of 3 threads of M threads, MJ threads and Rd threads is sequentially increased. With high endurance screw pairs, the stud illustrated in fig. 2 can be used to solve the problem of bolt failure of critical connections below stock fan products.

The above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. The anti-fatigue stud is characterized by comprising a stud body (1), wherein one end of the stud body (1) is a blind hole threaded matching end, and the other end is a nut matching end; the blind hole thread matching end is inconsistent with the thread type arranged on the nut matching end.

2. The anti-fatigue stud according to claim 1, wherein the threads provided at the threaded mating end of the blind hole are first threads (2) and the threads provided at the threaded mating end of the nut are second threads (3); the thread profile of the first thread (2) and the second thread (3) is one of triangle, trapezoid, zigzag or circular arc.

3. An anti-fatigue stud according to claim 2, wherein the thread profile of the first thread (2) and the second thread (3) is one of trapezoidal, saw-tooth or circular arc.

4. An anti-fatigue stud according to claim 2, wherein the thread profile of the first thread (2) and the second thread (3) is one of saw tooth or circular arc.

5. An anti-fatigue stud according to claim 2, wherein the thread profile of the first thread (2) and the second thread (3) is one of circular arcs.

6. A fatigue resistant stud according to claim 2, wherein the nominal diameters of the first thread (2) and the second thread (3) are the same.

7. A fatigue resistant stud according to claim 2, wherein the nominal diameters of the first thread (2) and the second thread (3) are different.

8. The anti-fatigue stud according to claim 2, wherein the blind hole internal thread matched by the blind hole thread matching end is an M thread, and the first thread (2) is an M thread or an MJ thread; the second thread (3) is an Rd thread.

9. A wind turbine blade root connection structure, comprising a blade (100), a blade root flange (103), a pitch bearing outer ring nut (104), a hub (106), a pitch bearing inner ring nut (107) and a pitch bearing (108), and 2 anti-fatigue studs according to any of claims 1-8.

10. A blade root connection structure of a wind turbine according to claim 9,

the blade (100), the blade root flange (103) and the variable-pitch bearing (108) are connected with the variable-pitch bearing outer ring nut (104) in a matched manner through an anti-fatigue stud;

the hub (106) and the variable-pitch bearing (108) are connected with the variable-pitch bearing inner ring nut (107) in a matched mode through an anti-fatigue stud.