CN112983755A

CN112983755A - Blade root and blade

Info

Publication number: CN112983755A
Application number: CN202110182180.XA
Authority: CN
Inventors: 易平; 孙找
Original assignee: Sany Renewable Energy Co Ltd
Current assignee: Sany Renewable Energy Co Ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-06-18
Anticipated expiration: 2041-02-09
Also published as: CN112983755B

Abstract

The invention provides a blade root and a blade, wherein the blade root comprises: the embedded thread sleeve comprises an embedded thread sleeve and one-way pieces, wherein the two adjacent one-way pieces clamp the embedded thread sleeve and coat the outer side face of the embedded thread sleeve. The blade root provided by the invention is used for solving the defects that in the prior art, the strength of the blade root is influenced because the field construction is time-consuming and the inner and outer reinforcing layers are easily wrinkled, and the layering process is reduced because the reinforcing layers do not need to be laid or the number of the reinforcing layers is reduced, so that the wrinkling is not easily formed, the field construction time is favorably shortened, and the construction efficiency is improved.

Description

Blade root and blade

Technical Field

The invention relates to the technical field of fans, in particular to a blade root and a blade.

Background

Wind power generation has the characteristics of low carbon, environmental protection, large capacity and the like, and is one of emerging development trends of power systems at present. With the development of wind power technology and the increase of the single machine capacity of the wind power generating set, how to further improve the reliability of the wind power generating set and reduce the manufacturing cost of the wind power generating set is a challenge faced by the current large-scale wind power generating set.

In the related art, referring to fig. 1 to 3, the blade root is constructed by sequentially laying an outer skin 120, an outer reinforcement layer 130, a pre-embedded assembly 140, an inner reinforcement layer 150, and an inner skin 160 on a mold 110. The embedded component 140 comprises a UD (Uni-Direction) rod 190, a thread insert 170 and a foam strip 180, the UD rod 190 is generally about 1m long, the lower surface of the UD rod 190 is a plane, a slope is arranged from the middle part to the tip part of the UD rod 190 on the upper surface, the thread insert 170 wound with fiber yarns is clamped in the middle of the UD rod 190, and the foam strip 180 is arranged at the end part of the thread insert 170.

In general, 20 layers of the outer reinforcement layer 130 are required to be laid, then the thread sleeve 170 and the UD rod 190 are laid, and 20 layers of the inner reinforcement layer 150 are laid on the inner side, so that the field construction is time-consuming, and the inner reinforcement layer 150 and the outer reinforcement layer 130 are easily wrinkled, so that the strength of the blade root is affected.

In order to solve the problems, a scheme that a light and thin flexible material is laid in a layer of a blade root is provided, wherein a V-shaped cut is formed at the tail end of the flexible material, and then the flexible material is poured and molded in advance. The structure only considers the problem of the folds of the flexible materials, the folds of the prefabricated member are not considered, the strength characteristics of the UD rod and the manufacturing efficiency advantages of the UD rod are not fully utilized, the emphasis is on improving the folds at the end part of the blade root cloth layer, and the problems that the field construction is time-consuming, the folds of the inner and outer reinforcing layers are easily caused, the strength of the blade root is influenced and the like are not solved.

Disclosure of Invention

The invention provides a blade root, which is used for solving the defects that in the prior art, the strength of the blade root is influenced because the field construction is time-consuming and the inner and outer reinforcing layers are easy to wrinkle, does not need to lay the reinforcing layers or reduce the number of the reinforcing layers, is difficult to form wrinkles, reduces the layering process, is also beneficial to shortening the field construction time and improving the construction efficiency.

The invention provides a blade root comprising:

embedding a threaded sleeve;

and the adjacent two unidirectional pieces clamp the embedded threaded sleeve and coat the outer side surface of the embedded threaded sleeve.

According to the blade root provided by the invention, the unidirectional element comprises a first clamping section and a second clamping section, the first clamping section clamps the embedded threaded sleeve, the second clamping section clamps the embedded flexible strip, and the second clamping section comprises a second inclined part coplanar with the first inclined part of the embedded flexible strip.

According to the blade root provided by the invention, the second inclined part comprises a first inclined surface and a second inclined surface which is opposite to the first inclined surface and is connected with the first inclined surface to form an included angle, the first inclined surface and the second inclined surface form an included angle with the surface of the paving layer of the first clamping section, the first clamping section comprises the surface of the paving layer and a clamping surface, and the clamping surface is connected through the surface of the paving layer.

According to the blade root provided by the invention, the first inclined plane and the surface of the paving layer form a first included angle, the second inclined plane and the surface of the paving layer form a second included angle, and the sum of the first included angle and the second included angle is an acute angle.

According to the invention, the first inclined part and the second inclined part are provided with reinforcing layers.

The blade root provided by the invention further comprises an embedded mold, the end part of the first clamping section is coplanar with the first end of the embedded mold, the second clamping section extends to the second end of the embedded mold along the first clamping section, and the first end and the second end are two opposite ends of the embedded mold.

The blade root provided by the invention further comprises an embedded die, an embedded outer skin and an embedded inner skin, wherein the embedded die, the embedded outer skin, the unidirectional pieces and the embedded inner skin are sequentially laid, and the embedded screw sleeves and the embedded flexible strips which are coaxially arranged are clamped between the adjacent unidirectional pieces.

According to the blade root provided by the invention, the unidirectional part is made of a unidirectional glass fiber material or a multi-axis glass fiber material;

and/or, the unidirectional element is formed by pultrusion.

According to the invention there is provided a blade root comprising a main beam area and edge areas at the ends of the main beam area, the length of the unidirectional elements of the main beam area being greater than the length of the unidirectional elements of the edge areas.

The invention also provides a blade comprising a blade root as described above.

The blade root provided by the invention comprises the embedded screw sleeves and the unidirectional parts, the adjacent unidirectional parts cover the outer side surfaces of the embedded screw sleeves, in order to completely cover the embedded screw sleeves, the thickness of the unidirectional parts needs to be increased, the volume proportion of the unidirectional parts in the blade root is increased due to the increased thickness of the unidirectional parts, the strength and the rigidity of the unidirectional parts are correspondingly enhanced, the structural strength and the structural rigidity of the blade root are favorably improved, reinforcing layers do not need to be laid or the number of layers of the reinforcing layers is reduced, wrinkles are not easily formed, the problem that the reinforcing layers generate wrinkles can be solved, the laying process is reduced, the field construction time is favorably shortened, and the construction efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an exploded view of a structure of a blade root provided in the related art;

fig. 2 is a schematic structural view of an assembled state of a pre-buried assembly provided in the related art;

fig. 3 is a schematic structural view of an exploded state of a pre-buried assembly provided in the related art;

FIG. 4 is a schematic exploded view of a blade root according to an embodiment of the present invention;

FIG. 5 is a schematic view of an assembled condition of a blade root according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an assembled state of a pre-buried component of a blade root according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram illustrating an exploded state of a pre-embedded component of a blade root according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a one-way element in a blade root according to an embodiment of the present invention.

Reference numerals:

110: a mold; 120: an outer skin; 130: an outer reinforcement layer;

140: pre-burying the assembly; 150: an inner reinforcement layer; 160: an inner skin;

170: a threaded sleeve; 180: a foam strip; 190: UD rod;

210: pre-burying a mold; 211: a first end; 212: a second end;

220: pre-burying an outer skin; 230: a one-way member; 231: a first clamping section;

2311: laying surface; 2312: a clamping surface; 232: a second clamping section;

2321: a first inclined surface; 2322: a second inclined surface; 2323: a third included angle;

240: pre-burying an inner skin; 250: embedding a threaded sleeve; 260: pre-burying a flexible strip;

261: a first inclined portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiments of the first aspect of the present invention, as illustrated in fig. 4-8, provide a blade root comprising: the embedded screw sleeve 250 and the unidirectional pieces 230 are embedded, and the two adjacent unidirectional pieces 230 clamp the embedded screw sleeve 250 and coat the outer side face of the embedded screw sleeve 250.

The one-way member 230 is configured with a clamping surface 2312 having the same shape as the outer side surface of the embedded thread insert 250, that is, the one-way member 230 is configured with an inward concave clamping surface 2312, so that the two one-way members 230 clamp and fix the embedded thread insert 250, the two one-way members 230 are matched to completely cover the outer side surface of the embedded thread insert 250, and the one-way member 230 completely protects the embedded thread insert 250; and the thickness of the one-way member 230 needs to be increased in order to fully cover the embedded screw sleeve 250. Because the thickness of the one-way member 230 is increased, the strength and rigidity of the one-way member 230 are correspondingly increased, which is helpful for improving the structural strength and structural rigidity of the blade root.

Compared with the prior art, as shown in reference 2 and fig. 3, the UD rod clamps the local outer side surface of the thread sleeve, and the structure of the blade root is reinforced through the inner and outer reinforcing layers; the clamping surface 2312 of the one-way member 230 of the embodiment is completely coated with the embedded thread insert 250, the thickness of the one-way member 230 is increased, the strength and the rigidity of the one-way member 230 are increased, at the moment, an inner reinforcing layer and an outer reinforcing layer can not be laid or the number of layers of the inner reinforcing layer and the outer reinforcing layer can be reduced, the layering process of the blade root is simplified, the production efficiency is improved, and the weight reduction of the blade root is realized.

Wherein the unidirectional element 230 may be understood as a UD rod. The outer side surface of the embedded screw sleeve 250 can be understood as a cylindrical surface of the embedded screw sleeve 250, the outer side surface does not include end surfaces of two ends of the embedded screw sleeve 250, one side end surface of the embedded screw sleeve 250 is coplanar with one end surface of the unidirectional member 230, and the other end surface of the embedded screw sleeve 250 is wrapped between the two unidirectional members 230.

The blade root of this embodiment, including the one-way component 230 that can wrap pre-buried swivel nut 250, the thickness increase of one-way component 230, and then structural strength and structural rigidity increase, simultaneously, for the UD stick structure of local cladding swivel nut among the correlation technique, the one-way component 230 of this embodiment has still increased the shared volume proportion in the blade root, because the structural strength of one-way component 230 is stable, help strengthening the bulk strength and the rigidity of blade root, need not to lay the enhancement layer or reduce the number of piles of enhancement layer this moment, then be difficult to form the fold, can solve the problem that the enhancement layer produced the fold, lay the process has been reduced, still help shortening on-the-spot engineering time, promote the efficiency of construction.

The fatigue resistance of the bolt in the blade root can be effectively improved by increasing the rigidity of the blade root, and the fatigue resistance of the bolt is an important factor influencing the design of the pitch circle size of the blade root and the number of the bolts. Under the same load condition, the blade root of the embodiment is adopted, so that the pitch circle size of the blade root can be smaller, the number of bolts can be fewer, and the weight of the whole blade root can be lighter.

In some embodiments, and as shown with reference to fig. 6-8, the one-way member 230 includes a first clamping section 231 and a second clamping section 232, the first clamping section 231 clamps the embedded threaded sleeve 250, the second clamping section 232 clamps the embedded flexible strip 260, and the second clamping section 232 includes a second inclined portion coplanar with the first inclined portion 261 of the embedded flexible strip 260.

The first clamping section 231 comprises a clamping surface 2312, the clamping surfaces 2312 oppositely arranged in the two unidirectional parts 230 clamp the outer side surfaces of the embedded screw sleeves 250, the second clamping section 232 is provided with a surface which is the same as the outer surface shape of the embedded flexible strip 260, so that the oppositely arranged unidirectional parts 230 can stably clamp and fix the embedded flexible strip 260, the first inclined part 261 of the embedded flexible strip 260 and the second inclined part of the unidirectional part 230 form an inclined surface, paving layers on the inclined surface is convenient, wrinkles are avoided in the paving process, and the area is increased.

The embedded flexible strip 260 is generally made of a PVC foam material, the embedded flexible strip 260 is generally in a long strip structure, and the embedded flexible strip 260 can be understood as a PVC foam strip.

Referring to fig. 7, the first inclined portions 261 each include two oppositely disposed inclined surfaces, and the second inclined portions also include two oppositely disposed inclined surfaces, it can be understood that the upper and lower surfaces of the embedded flexible strip 260 are both inclined surfaces, and the upper and lower surfaces of the unidirectional element 230 are both inclined surfaces. Wherein, pre-buried flexible strip 260 not only includes first slope portion 261, and the one end that pre-buried flexible strip 260 and pre-buried swivel nut 250 butt joint is equipped with connecting portion, and the shape of connecting portion and pre-buried swivel nut 250's shape looks adaptation.

Referring to the blade root structure shown in fig. 1 to 3, the inner and outer reinforcement layers need to be laid by about 50 layers, the laying process of the reinforcement layers is complicated, the construction time is long, and wrinkles are easily generated, but the blade root structure of this embodiment may omit or reduce the reinforcement layers, and if the reinforcement layers are laid on the unidirectional member 230, the first inclined portion 261 and the second inclined portion are provided, so that longer reinforcement layers can be conveniently lapped on the first inclined portion 261 and the second inclined portion.

In some embodiments, the second clamping section 232 further includes an extension portion having the same structure as the first clamping section 231 and configured to clamp the fixed embedded flexible strip 260, the extension portion is located between the second inclined portion and the first clamping section 231, and the extension portion is configured to facilitate fixing the embedded flexible strip 260.

In some embodiments, referring to FIG. 7, the second angled portion includes a first angled face 2321 and a second angled face 2322 disposed opposite and angled from the first angled face 2321, the first angled face 2321 and the second angled face 2322 each form an angle with the layup surface 2311 of the first clamping segment 231, the first clamping segment 231 includes a layup surface 2311 and a clamping surface 2312, and the clamping surfaces 2312 are connected by the layup surface 2311. The ply surface 2311 is generally planar and the ply surface 2311 is used to lay down skins or reinforcement layers.

The second inclined portion defines a tip structure by the first inclined surface 2321 and the second inclined surface 2322, the tip structure being located at an end away from the first clamping section 231.

In some embodiments, referring to FIG. 7, the first inclined surface 2321 forms a first included angle with the mat surface 2311, the second inclined surface 2322 forms a second included angle with the mat surface 2311, the sum of the first included angle and the second included angle is a third included angle 2323, and the third included angle 2323 is an acute angle.

The first included angle and the second included angle may be the same or different, but it is required to ensure that the third included angle 2323 is an acute angle, and therefore, the first included angle and the second included angle also need to be acute angles, and the angles of the first included angle and the second included angle may be set as required.

In some embodiments, the surfaces of the first inclined portion 261 and the second inclined portion are provided with a reinforcing layer (not shown), which serves as a reinforcement for adjusting the gap between the one-way element 230 and the inner skin or the outer skin and also for increasing the torsional rigidity of the blade root. Wherein, the enhancement layer generally adopts the multiaxial cloth. Wherein the reinforcement layer may include at least one of an inner reinforcement layer and an outer reinforcement layer.

In this embodiment, the number of enhancement layers is less than 50.

In some embodiments, referring to fig. 4 and 5, the blade root further includes an insert 210, an end of the first clamping segment 231 is coplanar with a first end 211 of the insert 210, the second clamping segment 232 extends along the first clamping segment 231 to a second end 212 of the insert 210, and the first end 211 and the second end 212 are opposite ends of the insert 210.

The first end 211 of the pre-buried mold 210 corresponds to the section of the blade root of 0 meter, the second end 212 corresponds to the termination position near the geometric cylindrical section of the blade root, the one-way piece 230 is stopped from the section of the blade root of 0 meter to the termination position near the geometric cylindrical section of the blade root, and inclined planes are inverted on the upper surface and the lower surface of the one-way piece 230, so that the one-way piece can be conveniently lapped with a longer reinforcing layer.

In some embodiments, referring to fig. 4 to 6, the blade root further includes an embedded mold 210, an embedded outer skin 220, and an embedded inner skin 240, the embedded mold 210, the embedded outer skin 220, the unidirectional members 230, and the embedded inner skin 240 are sequentially laid, and an embedded swivel nut 250 and an embedded flexible strip 260 coaxially disposed are clamped between adjacent unidirectional members 230.

Compared with the blade root shown in fig. 1, the blade root of the embodiment can omit the inner and outer reinforcing layers by increasing the strength and rigidity of the unidirectional member 230, so that the problem of wrinkles in the process of laying the reinforcing layers does not exist, the laying efficiency is improved, and the construction time is shortened.

The unidirectional member 230 is directly laid after the pre-buried outer skin 220 is laid, and the thickness of the unidirectional member 230 is thicker than that of a conventional UD rod in consideration of the fact that the unidirectional member 230 can also play a role of replacing an inner reinforcing layer and an outer reinforcing layer. The length of the one-way element 230 ends from the end surface of the first end 211 of the blade root to the vicinity of the cylindrical section of the geometry of the second end 212 of the blade root. If the reinforcing layer is laid, the reinforcing layer beyond the unidirectional member 230 can be overlapped with the upper and lower oblique angles of the tip of the unidirectional member 230, and finally, the inner skin is laid and then integrally poured and formed.

In some embodiments, the unidirectional member 230 is made of a unidirectional glass fiber material or a multi-axial glass fiber material, and the unidirectional glass fiber material or the multi-axial glass fiber material has light weight and high structural strength, and is beneficial to weight reduction and reinforcement of the unidirectional member 230, so that the weight of the blade root is reduced, and the structural strength of the blade root is improved.

In some embodiments, the unidirectional element 230 is formed by pultrusion, and the unidirectional element 230 is a prefabricated structural element, and the pultrusion process is simple and efficient.

The unidirectional component 230 is a pultrusion prefabricated component, the modulus of the unidirectional component 230 is improved by about 20% compared with that of the ordinary poured glass fiber, and therefore the effect that the blade root can bear larger blade root load by using thinner blade root thickness can be achieved, and the weight of the blade root is reduced.

In some embodiments, the blade root includes a main beam region and edge regions (not shown) at the ends of the main beam region, the length of the unidirectional elements 230 in the main beam region being greater than the length of the unidirectional elements 230 in the edge regions. The length of the unidirectional elements 230 in the main beam region is large, which contributes to enhancing the structural strength of the main beam region, and the length of the unidirectional elements 230 in the edge region is small, which contributes to reducing the weight of the edge region, thereby optimizing the bearing capacity and weight distribution of the blade root.

The blade root in the above embodiment provides a structure of a pultrusion prefabricated blade root from the perspective of structure modularization manufacturing and assembling, the rigidity of the blade root can be effectively improved, the fatigue resistance of bolt connection can be improved, the one-way part 230 can be prefabricated in a separate die, a main die of a blade shell does not need to be occupied, and the production efficiency of the blade can be greatly improved.

In a second aspect of the embodiments of the present invention, referring to fig. 4 to 8, a blade is provided, which includes the blade root in one or more embodiments, and the blade root has all the above beneficial effects, and details are not repeated herein.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A blade root, comprising:

embedding a threaded sleeve;

2. The blade root as claimed in claim 1, wherein the one-way member includes a first clamping section to clamp the embedded threaded sleeve and a second clamping section to clamp the embedded flexible strip, the second clamping section including a second inclined portion coplanar with the first inclined portion of the embedded flexible strip.

3. The blade root of claim 2, wherein the second beveled portion includes a first beveled surface and a second beveled surface disposed opposite and connected to the first beveled surface at an included angle, the first and second beveled surfaces each forming an included angle with a ply surface of the first clamping section, the first clamping section including the ply surface and a clamping surface, the clamping surface being connected by the ply surface.

4. The blade root of claim 3, wherein the first inclined surface forms a first included angle with the ply surface, the second inclined surface forms a second included angle with the ply surface, and a sum of the first included angle and the second included angle is an acute angle.

5. A blade root according to claim 2, characterized in that the first and second inclined portions lay down a reinforcement layer.

6. The blade root of claim 2, further comprising an insert, wherein an end of the first clamping segment is coplanar with a first end of the insert, the second clamping segment extends along the first clamping segment to a second end of the insert, and the first and second ends are opposite ends of the insert.

7. The blade root as claimed in any one of claims 1 to 6, further comprising an embedded mold, an embedded outer skin and an embedded inner skin, wherein the embedded mold, the embedded outer skin, the unidirectional members and the embedded inner skin are sequentially laid, and the embedded thread sleeves and the embedded flexible strips which are coaxially arranged are clamped between the adjacent unidirectional members.

8. A blade root according to any one of claims 1-6, characterized in that the material of the unidirectional element is a unidirectional fiberglass material or a multi-axial fiberglass material;

and/or, the unidirectional element is formed by pultrusion.

9. A blade root according to any one of claims 1 to 6, comprising a main beam region and edge regions at ends of the main beam region, the unidirectional elements of the main beam region having a length greater than the length of the unidirectional elements of the edge regions.

10. A blade comprising a blade root according to any one of claims 1 to 9.