CN218118282U

CN218118282U - Embedded bolt sleeve and wind driven generator

Info

Publication number: CN218118282U
Application number: CN202222442562.4U
Authority: CN
Inventors: 索伦森·B·卡斯顿; 余岫卷
Original assignee: Envision Energy Co Ltd
Current assignee: Envision Energy Co Ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2022-12-23
Anticipated expiration: 2032-09-15

Abstract

The utility model provides a buried bolt cover and aerogenerator in advance, a buried bolt cover includes the sleeve pipe in advance, and the first inner wall of sheathed tube is provided with the inner wall screw thread to and the lower half is connected with first, and has the diameter that increases in the direction of keeping away from first portion, and include that a N section intersect is the section plane of hyperbolic curve or parabola. The length of the embedded bolt sleeve is increased by increasing the lower half part of the horn mouth shape, and meanwhile, the contact area between the end face of the bolt sleeve and the flange is increased by forming a section plane, so that the rigidity of the blade root bolt lock clamping piece is enhanced, the bearing coefficient of the blade root bolt and the bending stress coefficient of the blade root bolt are effectively reduced, and the endurance of blade root connection is improved.

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 increase pre-buried bolt cover terminal surface and blade root flange and/or become oar bearing complex area of contact, the utility model provides a pre-buried bolt cover, including first portion and second portion, wherein the inner wall of first portion is provided with the inner wall screw thread to and the second portion is connected with first portion, for the horn mouth form, it has the diameter that increases in the direction of keeping away from first portion promptly, wherein second portion includes a N section plane, section plane's section intersect is hyperbolic curve or parabola, and wherein N is the natural number.

Further, the height of the second portion is equal to or greater than 5 millimeters.

Furthermore, the section plane is parallel to the central axis of the embedded bolt sleeve or forms an included angle with the central axis of the embedded bolt sleeve.

Further, the second portion comprises two cross-sectional planes, and the two cross-sectional planes are axisymmetric along the central axis of the embedded bolt sleeve.

Further, the minimum distance between the two sectional planes is equal to or greater than the width of the first portion.

Further, the second portion comprises four section planes, and the four section planes are respectively in two-to-two axial symmetry along the central axis of the embedded bolt sleeve.

Further, the minimum distance between any pair of sectional planes is equal to or greater than the width of the first portion.

Further, an outer surface of the first portion 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, its bottom is provided with horn mouth column structure, with extension the length of embedded bolt cover is amputated simultaneously the partial material of the at least both sides of horn mouth column structure, and then the area of contact of increase bolt cover terminal surface and flange. The embedded bolt sleeve can increase the rigidity of the clamping piece of the blade root bolt lock, thereby reducing the bearing coefficient of the blade root bolt and the bending stress coefficient of the blade root bolt, and improving the connection endurance of the blade root.

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 is a schematic structural diagram 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 cross-sectional view of a pre-buried bolt sleeve according to an embodiment of the present invention;

fig. 4 is a schematic view showing a shape of a bottom surface of a buried bolt sleeve according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a pre-buried bolt sleeve according to another embodiment of the present invention;

fig. 6 is a schematic front view of a pre-buried bolt sleeve according to another embodiment of the present invention;

fig. 7 shows a schematic cross-sectional view of a sleeve of a pre-buried bolt according to a further embodiment of the present invention;

fig. 8 is a schematic view showing the shape of the bottom surface of a buried bolt sleeve according to still another embodiment of the present invention;

fig. 9 is a schematic view of a pre-buried bolt bushing for connecting blade roots according to an embodiment of the present invention; and

fig. 10 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, unless otherwise specified, "disposed on …", "disposed above …" and "disposed above …" do not exclude the presence of an intermediate therebetween. Further, "disposed on or above …" merely indicates the relative positional relationship between two members, and may also be converted to "disposed under or below …" or vice versa in certain cases, such as after reversing the product direction.

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 blade of the wind driven generator is a key factor for limiting the cost of the whole machine. At present, the connection of blade roots of blades is realized by adopting an embedded bolt sleeve process, the end face of the embedded bolt sleeve is matched with a blade root flange or a variable pitch bearing, and the shearing load of a matching surface is transferred through friction. The contact area of the end face of the embedded bolt sleeve and the blade root flange or the variable pitch bearing is increased, the friction force can be increased, the pressure of the matched contact surface can be effectively reduced, and the endurance of the matched contact surface is improved.

Based on this, in order to improve the endurance of root bolt, improve the blade root and connect the frictional force that is connected contact cross-section by the holder, reduce the stress level of bolt housing bottom contact surface, the utility model provides a pre-buried bolt housing at first increases the horn mouth column structure of take the altitude in its bottom, with extension the length of pre-buried bolt housing amputates simultaneously the partial material of the at least both sides of horn mouth column structure, and then the area of contact of increase bolt housing terminal surface and flange.

The invention will be further elucidated with reference to the drawings in conjunction with the detailed description.

Fig. 1 shows a schematic structural view of an embedded bolt sleeve according to an embodiment of the present invention. As shown in fig. 1, a stud sleeve comprises a sleeve, wherein the sleeve comprises two parts, wherein the upper part is a first part 101 which is cylindrical, the lower part is a second part 102 which is flared, namely the flared structure has a diameter which increases in a direction away from the first part, and the flared structure comprises N cross-sectional planes 121, wherein N is a natural number. The horn mouth-shaped structure increases the contact area between the end surface of the embedded bolt sleeve and the blade root flange, and further increases the rigidity of the blade root bolt lock clamping piece, so that the bearing coefficient of the blade root bolt can be reduced, the bending stress coefficient of the blade root bolt is reduced, and the endurance of blade root connection is improved. In an embodiment of the present invention, the height H1 of the second portion 102 is greater than or equal to 5 mm, thereby increasing the length of the embedded bolt sleeve and further increasing the rigidity of the root bolt lock clamping member.

Fig. 2 and fig. 3 respectively show a front view and a cross-sectional schematic view of a pre-buried bolt sleeve according to an embodiment of the present invention. As shown, in one embodiment of the present invention, the inner wall of the first portion 101 of the set of embedded bolts is provided with an inner wall thread that matches the surface thread of the root bolt for threadingly securing connection with the root bolt. In order to enable the embedded bolt sleeve to be embedded into the inner and outer glass fiber layers of the fan blade, as shown in the figure, in an embodiment of the present invention, the surface of the first step 101 is provided with a groove 111. Specifically, as shown in the figure, the first part of the embedded bolt sleeve, namely the outer surface of the part embedded to the root of the fan blade, is provided with the corrugated concave-convex arrangement, so that the embedded bolt sleeve and the inner and outer glass fiber layers of the fan blade can be embedded mutually, the extraction load of the embedded bolt sleeve is increased, and the bearing capacity is improved.

As shown in the figure, the second portion 102 is a bell-mouth shaped structure, and the sectional area of the second portion gradually increases from the connection with the first portion 101, and as shown in the figure, the bottom diameter D2 of the bell-mouth shaped structure is greater than the bottom diameter D1 of the first portion 101. In order to make the terminal surface of buried bolt cover in advance can with become the cooperation of oar bearing the embodiment of the utility model discloses an in, still further amputate the partial material of horn mouth column structure forms a N section plane on it, wherein N is the natural number. As shown, in an embodiment of the present invention, the intersecting line of the sectional planes is a hyperbolic line or a parabolic line. In an embodiment of the present invention, the cross-sectional plane is parallel to a central axis of the embedded bolt sleeve, that is, the cross-sectional plane is perpendicular to a bottom surface of the embedded bolt sleeve. In another embodiment of the present invention, an included angle is formed between the section plane and the central axis of the embedded bolt sleeve.

As shown in fig. 1 to 3, in an embodiment of the present invention, the bell-mouth-shaped structure of the second portion 102 includes two cross-sectional planes, and the two cross-sectional planes are axisymmetric along the central axis of the embedded bolt sleeve. In an embodiment of the present invention, the two cross-sectional planes may be parallel or non-parallel. Fig. 4 is a schematic view showing a shape of a bottom surface of a buried bolt sleeve according to an embodiment of the present invention. As shown in fig. 4, the bottom surface of the bell-mouth-shaped structure of the second portion 102 is composed of two line segments and two arc lines, wherein the two line segments are opposite sides, which may be parallel or non-parallel. In an embodiment of the invention, the two straight lines see a minimum close distance, i.e. the minimum distance L1 between the two sectional planes is greater than or equal to the bottom surface diameter D1 of the first portion.

Fig. 5 shows a schematic structural view of a buried bolt sleeve according to still another embodiment of the present invention, fig. 6 and 7 show schematic front and cross-sectional views of the buried bolt sleeve according to the embodiment, respectively, and fig. 8 shows a schematic bottom shape of the buried bolt sleeve according to the embodiment. In another embodiment of the present invention, as shown in fig. 4, the bell-mouth-shaped structure of the second portion 102 comprises four cross-sectional planes, which are obtained by cutting off the partial structure of the bell-mouth bottom end by using two pairs of symmetrical planes, so that the bottom surface of the bell-mouth-shaped structure of the second portion 102 is rectangular. This means that the four cross-sectional planes are each axisymmetrical two by two along the central axis of the fastener insert. Regarding two cross-sectional planes symmetrical to each other as a pair, any pair of cross-sectional planes may be parallel or non-parallel in the embodiment of the present invention. Similarly, in an embodiment of the present invention, the length of any side of the bottom surface of the bell-mouth-shaped structure of the second portion 102, i.e. the minimum distance L1 or L2 between any pair of cross-sectional planes, is greater than or equal to the diameter D1 of the bottom surface of the first portion.

It should be understood that in other embodiments of the present invention, there may be different numbers of cross-sectional planes, and each cross-sectional plane does not necessarily need to be symmetrical around the central axis of the sleeve. For example, in other embodiments of the present invention, a section of a cylindrical feature may be added to the bottom end of the bell-mouth-shaped structure of the second portion 102, and then a symmetrical plane may be used to cut off a portion of the bottom material of the second portion, wherein the height of the cylinder is not limited.

Fig. 9 is a schematic view of a set of embedded bolts connecting blade roots according to an embodiment of the present invention. 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 portion of the embedded bolt sleeve, further penetrates through a mounting hole of the variable pitch bearing 202, and finally is fixed to an 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. 10 shows a wind turbine according to an embodiment of the present invention, in which the blade root of the wind turbine 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 kind of embedded bolt sleeve, characterized by that, comprising:

a first part; wherein an inner wall thread is arranged on the inner wall of the first part; and

and a second portion connected to the first portion and having a diameter that increases in a direction away from the first portion, wherein the second portion includes N sectional planes whose sectional intersections are hyperbolic or parabolic lines, where N is a natural number.

2. The sleeve of claim 1, wherein the second portion has a height of 5 mm or more.

3. The jacket bolt of claim 1, wherein said cross-sectional plane is parallel to or forms an angle with said jacket bolt axis.

4. The jacket bolt of claim 1, wherein the second portion includes two cross-sectional planes, and wherein the two cross-sectional planes are axisymmetric about the jacket bolt central axis.

5. The sleeve of claim 4, wherein the minimum spacing between the two cross-sectional planes is equal to or greater than the width of the first portion.

6. The jacket insert of claim 1, wherein said second portion includes four cross-sectional planes, and wherein said four cross-sectional planes are each axisymmetric with respect to each other about said jacket insert central axis.

7. The sleeve of claim 6, wherein the minimum distance between any pair of cross-sectional planes is greater than or equal to the width of the first portion.

8. The jackbolt sleeve of claim 1, wherein the outer surface of the first portion includes a groove.

9. A wind turbine generator, characterized in that a blade root of the wind turbine generator comprises the embedded bolt sleeve according to any one of claims 1 to 8, 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.