CN217682735U

CN217682735U - Embedded bolt sleeve and wind driven generator

Info

Publication number: CN217682735U
Application number: CN202222017221.2U
Authority: CN
Inventors: 余岫卷; 卢力航; 韩鲁明; 陈铁锋; 王永武
Original assignee: Envision Energy Co Ltd
Current assignee: Envision Energy Co Ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2022-10-28
Anticipated expiration: 2032-08-02

Abstract

The utility model provides a buried bolt cover in advance, it includes the sleeve pipe, and the sleeve pipe is close to its inner wall threaded one end and is provided with two at least flutings. The grooving damages the integrity of the section of the circular ring at the tail part of the embedded bolt sleeve, and further reduces the section rigidity of the grooved part, so that the rigidity reducing effect can be realized under the condition that the tail part of the embedded bolt sleeve is shorter. Adopt pre-buried bolt cover can reduce bolt cover afterbody length on the one hand, saves bolt cover material materials, and on the other hand can also guarantee the good rigidity transition of bolt cover and blade main part.

Description

Embedded bolt sleeve and wind driven generator

Technical Field

The utility model relates to a wind power generation technical field, in particular to buried bolt cover and aerogenerator in advance.

Background

The wind power generator can convert wind energy into mechanical energy and further into electric energy. A wind generator typically includes a tower, a nacelle connected to the tower and supporting a hub. Two or more fan blades are arranged on the hub, wherein the fan blades rotate a rotor arranged in the hub about an axis under the influence of wind, wherein rotation of the rotor of the generator relative to the stator generates electrical energy.

The fan blades are typically secured to the hub by root bolts. At present, the root bolt mostly adopts an embedded bolt sleeve process, and the embedded bolt sleeve is matched with the root bolt so as to realize the connection of the blade root of the fan blade and the variable pitch bearing in the hub. And when the root bolt is meshed with the embedded bolt sleeve, the root bolt, the embedded bolt sleeve and the blade root material bear the external limit and the fatigue load together.

Along with the development of the wind power industry, the size and the weight of the fan blade are larger and larger, so that the load of the blade root is correspondingly improved, and the requirement on the connection strength of the root of the fan blade and the hub is higher.

SUMMERY OF THE UTILITY MODEL

In order to guarantee the good transition of buried bolt cover and fan blade rigidity in advance, the utility model provides a buried bolt cover in advance, the installation structure comprises a sleeve, the sleeve pipe has relative first end and second section each other, and first end is for being close to the one end of sheathed tube inner wall screw thread, wherein first end department is provided with two at least flutings.

Further, the space shape of any one of the slots is a spiral line shape, and the central trajectory line of the slot is a spiral line.

Further, the helix angle of the central track line of the slot ranges from 45 ° to 90 °.

Further, the spatial shape of any one of the slots is linear, and the central trajectory line of the slot is parallel to the axis of the sleeve.

Further, any one of the slots is rectangular in shape when flattened along the circumferential direction of the sleeve.

Further, when any one of the slots is flattened along the circumferential direction of the sleeve, the slot is trapezoidal in shape, and the width of the first end is larger than that of the second end, wherein the first end is the end close to the tail end of the sleeve.

Further, the depth of the groove is more than or equal to 4 mm.

Further, a round hole is formed in the second end of any one of the slots, and the diameter of the round hole is larger than the width of the second end.

Further, the depth, and/or shape, and/or width of each slot may be the same or different.

Further, the opening of the first end of the sleeve pipe is gradually reduced inwards to form a horn-shaped structure, and the groove is formed in the horn-shaped structure.

Further, the outer surface of the sleeve includes a groove.

The utility model also provides a wind driven generator, its blade root include as before the buried bolt cover in advance, buried bolt cover in advance is used for the first end of fixed blade root bolt, the second end of blade root bolt through become the inner circle nut of oar bearing fixed with become the inner circle of oar bearing, so that the terminal surface of blade root with become the laminating of the inner circle of oar bearing.

The utility model provides a pair of embedded bolt cover through setting up grooved mode at the afterbody, has destroyed the ring cross-section integrality of embedded bolt cover's afterbody, and then reduced the cross-sectional rigidity of fluting part, consequently can realize under the shorter condition of embedded bolt cover afterbody that rigidity slows down the effect. Adopt pre-buried bolt cover can reduce bolt cover afterbody length on the one hand, saves bolt cover material materials, and on the other hand can also guarantee the good rigidity transition of bolt cover and blade main part.

Drawings

To further clarify the above and other advantages and features of various embodiments of the present invention, a more particular description of various embodiments of the invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.

Fig. 1 shows a schematic cross-sectional view of a pre-buried bolt sleeve according to an embodiment of the present invention;

fig. 2 is a schematic front view of a pre-buried bolt sleeve according to an embodiment of the present invention;

fig. 3 is a schematic structural view illustrating a grooving of a pre-buried bolt sleeve according to an embodiment of the present invention;

fig. 4a and 4b are schematic diagrams illustrating the connection of a blade root by a set of embedded bolts according to an embodiment of the present invention; and

fig. 5 shows a wind power generator using an embodiment of the present invention.

Detailed Description

The invention will be further elucidated with reference to the drawings in conjunction with the detailed description. It should be noted that the components in the figures may be exaggerated and not necessarily to scale for illustrative purposes. In the figures, identical or functionally identical components are provided with the same reference symbols.

In the present invention, "disposed on" \ 8230 "", "disposed above" \8230and "disposed above" \8230 "", do not exclude the presence of an intermediate therebetween, unless otherwise specified. Furthermore, "arranged on or above" \\8230 ", merely indicates a relative positional relationship between two components, and in certain cases, such as after reversing the product direction, may also be converted to" arranged under or below \8230 ", and vice versa.

In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.

In the present application, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise indicated.

It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those skilled in the art will appreciate that the components or assemblies may be added as needed for specific scenarios, given the teachings of the present invention.

It is also to be noted that, within the scope of the present invention, the expressions "identical", "equal", etc., do not mean that the two values are absolutely equal, but allow a certain reasonable error, that is, the expressions also cover "substantially identical", "substantially equal". By analogy, in the present disclosure, the terms "perpendicular to", "parallel to", and the like in the table direction also cover the meaning of "substantially perpendicular to", "substantially parallel to".

The endurance of the blade root connection of the wind driven generator is a key factor for limiting the cost of the whole machine, and the blade root connection is realized by adopting an embedded bolt sleeve process at present, so the ultimate drawing endurance of the embedded bolt sleeve is an important index for influencing the blade root connection endurance. The area where the rigidity of the bonding part of the embedded bolt sleeve and the blade is changed obviously enables the blade to possibly generate higher shear stress load when rotating, and leads to cracks between the embedded bolt sleeve and the blade, and further connection failure. Therefore, in order to improve the ultimate pull resistance of the bolt sleeve, on the one hand, the rigidity of the bolt sleeve can be considered so as to form a good rigidity transition between the bolt sleeve and the blade. Based on this, the utility model provides a pre-buried bolt cover, its mode through the afterbody fluting slows down rigidity.

The invention will be further elucidated with reference to the drawings in conjunction with the detailed description. Fig. 1 and fig. 2 respectively show a cross section and a front view of a pre-buried bolt sleeve according to an embodiment of the present invention. As shown, a buried bolt sleeve includes a sleeve having a first end and a second end opposite to each other, and being a unitary cylinder. According to different functions, the sleeve can be divided into three parts in sequence: grooved portion 101, threaded portion 102, and support portion 103.

The end where the slotted part 101 is located is denoted as the first end or the tail end of the cannula. Because the embedded bolt sleeve is embedded into the blade root, a good transition with the rigidity of the blade needs to be formed. Based on this, in an embodiment of the present invention, N slots 111 are provided at the tail end of the sleeve, and the value of N is preferably greater than or equal to 2. In the embodiment of the present invention, the shape, position and size of each slot on the same sleeve can be the same or different. That is, the shape, location, and size of each slot may be identical on the same ferrule, or there may be a difference in one or more of the shape, location, and size of any two slots on the same ferrule.

In an embodiment of the present invention, the central trajectory line spatial shape of the slot 111 is a straight line. The central trajectory of the slot 111 is parallel to the axis of the cannula.

In yet another embodiment of the present invention, the slotted space shape is a helix, and the slotted center trajectory line is a helix. Preferably, in an embodiment of the present invention, the helix angle a of the central trajectory line of the slot has a value in the range of 45 ° or more and a < 90 °.

Fig. 3 shows a schematic structural view of a slot of a pre-buried bolt sleeve according to an embodiment of the present invention. As shown in fig. 3, when the slot is flattened along the circumferential direction of the sleeve, the widths of the portions of the slot may be the same or different. In an embodiment of the present invention, the slot 111 is shaped as a parallelogram when it is flattened along the circumferential direction of the casing, that is, the width L1 of the first end of the slot 111 is equal to the width L2 of the second end of the slot 111. In one embodiment of the present invention, the slot 111 is trapezoidal in shape when it is flattened along the circumferential direction of the casing, that is, the width L1 of the first end of the slot 111 is greater than the width L2 of the second end of the slot 111, wherein the first end of the slot 111 is the end close to the tail end of the casing. It should be understood that in other embodiments of the present invention, the shape of the slot flattened along the circumferential direction of the sleeve may be other shapes, but the following requirements must be satisfied: l1 is more than 0 and less than or equal to L2, namely the width L1 of the first end of the slot 111 is not less than the width L2 of the second end of the slot 111, and the values of the two are not 0.

In order to better weaken the rigidity of the sleeve tail, in the embodiment of the present invention, the depth H of the slot is preferably greater than or equal to 4 mm, wherein the depth H refers to the vertical distance from the first end of the slot 111 to the second end thereof.

In order to improve the fatigue strength of the second end of the slot, in an embodiment of the present invention, the second end of the slot is further provided with a circular hole 112, and the diameter of the circular hole is preferably greater than the width L2 of the second end of the slot 111.

In order to further reduce the rigidity of the tail of the sleeve, in an embodiment of the present invention, the inner wall of the groove 101 is designed to be trumpet-shaped, i.e. the opening of the first end of the sleeve is inwardly tapered to form a trumpet-shaped structure, as shown in the figure, the groove 111 is disposed on the trumpet-shaped structure.

A first end of the threaded portion 102 is connected to a second end of the slotted portion 101, and an inner surface thereof is provided with inner wall threads for engagement with a root bolt. In an embodiment of the present invention, a sealing ring may be disposed between the grooved portion 101 and the threaded portion 102.

The first end of the support part 103 is connected to the second end of the threaded part 102, and the first end of the blade root bolt is fixed to the threaded part and then extends out of the blade root through the support part.

In order to further strengthen the drawing endurance of the embedded bolt sleeve, in an embodiment of the present invention, grooves are disposed on the outer surface of the sleeve, and the grooves may be uniformly distributed on the outer surface of the sleeve, and the depth and the distance of the grooves are set according to requirements.

Fig. 4a is a schematic view of a pre-buried bolt bushing for connecting blade roots according to an embodiment of the present invention; and FIG. 4b is an enlarged view of a portion of the structure within the dashed box of FIG. 4 a. As shown in the figure, the embedded bolt sleeve 100 is embedded in the root of the blade 200, a first end of the blade root bolt 201 is fixed inside the embedded bolt sleeve through inner wall threads, a second end of the blade root bolt extends out of the blade through a supporting part of the embedded bolt sleeve and further passes through the mounting hole of the variable-pitch bearing 202, and finally the blade root bolt is fixed to the inner ring of the variable-pitch bearing through an inner ring nut 221 of the variable-pitch bearing, so that the end surface of the blade root is attached to the inner ring of the variable-pitch bearing. In an embodiment of the invention, a blade root flange 203 may also be provided between the blade and the pitch bearing.

Fig. 5 shows a wind power generator according to an embodiment of the present invention, the blade root of the wind power generator is provided with the embedded bolt sleeve as described above. The embedded bolt sleeve is embedded into the root of the blade in an embedded mode. Specifically, in the manufacturing process of the blade root, glass fiber yarns are wound outside the embedded bolt sleeve, the outer surface of each yarn is parallel and level to the outer surface of the embedded bolt sleeve in a small enveloping cylinder, and then the yarn and the outer surface of the embedded bolt sleeve are placed into a layer of the blade root and integrally molded with other glass fiber material perfusion resins of the blade root. And in the installation process of the blade, a blade root bolt is screwed into the embedded bolt sleeve, so that the end surface of the blade root of the blade is tightly combined with the inner ring of the variable pitch bearing.

While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

Claims

1. A jackbolt sleeve comprising a sleeve having first and second ends opposite one another and the first end being the end proximate the inner wall thread of the sleeve, wherein at least two slots are provided at the first end.

2. The jackbolt sleeve of claim 1, wherein the spatial shape of any of the slots is a helix and the central trajectory of the slot is a helix.

3. The embedded bolt sleeve as defined in claim 2, wherein the helix angle a of the grooved central trajectory line ranges from:

45°≤A<90°。

4. the jackbolt sleeve of claim 1, wherein the spatial shape of any of the slots is linear and the central trajectory of the slot is parallel to the axis of the sleeve.

5. The jackbolt sleeve of claim 1, wherein the width of a first end of any slot is equal to the width of a second end of the slot when the slot is flattened along the circumference of the sleeve.

6. The sleeve of claim 1, wherein the slot has a first end with a width greater than a width of a second end when the slot is flattened along the circumference of the sleeve, wherein the first end is the end adjacent to the first end of the sleeve.

7. The sleeve of claim 1, wherein the depth of any one of said slots is greater than or equal to 4 mm.

8. The jackbolt sleeve of claim 1, wherein a circular hole is provided at the second end of any of the slots, the diameter of the circular hole being greater than the width of the second end of the slot, and wherein the first end is the end of the first end of the sleeve.

9. The sleeve of claim 1, wherein the depth, shape and/or width of each slot is the same or different.

10. The jackbolt sleeve of claim 1, wherein the opening at the first end of the sleeve tapers inwardly to form a flared configuration, and the slot is disposed in the flared configuration.

11. The jackbolt sleeve of claim 1, wherein the outer surface of the sleeve includes a groove.

12. A wind turbine generator comprising a blade, wherein a blade root of the blade comprises the embedded bolt sleeve according to any one of claims 1 to 11, the embedded bolt sleeve is configured to fix a first end of a blade root bolt, and a second end of the blade root bolt is fixed to an inner ring of a pitch bearing through an inner ring nut of the pitch bearing, so that an end surface of the blade root is attached to the inner ring of the pitch bearing.