CN107344422A - Wind electricity blade lightweight leaf and root structure production method - Google Patents

Abstract

The invention discloses a production method of a lightweight blade root structure of a wind power blade. The blade root structure includes a body of fiber reinforced composite material, the body forms the shape of the blade root structure, and the body wraps and fixes a plurality of bolt sleeve assemblies inside, and is characterized in that , the body has a lightweight material insert and a lightweight material layer; wherein the production method of the lightweight blade root structure includes the following steps: configuring a forming mold; laying an outer glass fiber layer and a lightweight material layer; installing the insert body; installation of bolt sleeves; installation of lightweight strips; laying of inner fiberglass layers and infusion molding. The interposers are correspondingly arranged at interval positions on the outer sides of each of the bolt sleeve assemblies, the light material layer is arranged between the outer side of the bolt sleeve assembly and the outer surface of the body, and the light material layer blade root The side end is spaced a certain distance from the side end surface of the blade root of the wind power blade. Compared with the blade root structure in the prior art, the weight is lighter, and the interface protection and production efficiency are improved.

Description

Production method of lightweight blade root structure for wind power blades

technical field

The invention relates to the technical field of wind power generation, in particular to a method for producing a lightweight blade root structure of a wind power blade with a lighter weight.

Background technique

With the increase of power generation, the length or weight of wind power blades increases synchronously, which leads to a synchronous increase in the operating load of bearings, towers and other supporting projects. On the premise of not affecting the power generation, reducing the total weight of the blades is one of the development directions of wind power blades.

An existing technology, such as the US patent with the publication number US20110044817A1, which is the subject of the blade root connection method, provides a bearing capacity for high-power blades because more bolts can be assembled. However, the inside and outside of the pre-embedded bolt sleeve (also known as the inner and outer skin) are all fiber reinforced materials, and the density of existing fiber reinforced materials is usually greater than 1000Kg/m ³ , such as glass fiber reinforced epoxy resin with a density of about 1900Kg/m ^3. The overall weight of the blade root structure is too large.

Another prior art, such as the Chinese patent with the publication number CN1802285A and the theme of the blade root connector, reduces the weight of the blade root by means of a backing plate while providing bearing capacity. At the same time, it increases the thickness of the product by laying reinforcement material strips layer by layer between the two pre-embedded bolt sleeves. But this method still has the problems of heavy weight and complicated construction technology. In addition, the lightweight material protrudes along the axial direction of the blade and is flush with the end surface of the blade root. Since this type of lightweight material is not completely closed, it is easy to be attacked by other media, such as swelling in liquid and easy to occur in air. oxidation and so on.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in the art to a person of ordinary skill in the art.

Contents of the invention

A main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art, and provide a method for producing a lightweight root structure of a wind turbine blade that is lighter in weight and can improve production efficiency.

In order to realize the above-mentioned purpose of the invention, the present invention adopts following technical scheme:

According to one aspect of the present invention, a method for producing a lightweight blade root structure of a wind turbine blade is provided. The blade root structure includes a body of fiber-reinforced composite material, the body forms the shape of the blade root structure, and the body wraps and fixes a plurality of internal bolts A set of components, the body has a lightweight material insert and a lightweight material layer; wherein the production method of the lightweight blade root structure includes the following steps:

Provide configuration with a forming mold;

laying an outer glass fiber layer and a lightweight material layer, and laying an outer reinforcing fiber layer and a lightweight material layer in the position corresponding to the outer wall of the root structure in the mold, including the reinforcing fiber between the lightweight material layer and the blade root Floor;

Install the insert body, place multiple insert bodies on the inner side of the light material layer, so that the outer surface of the insert body is tiled on the light material layer, and two adjacent insert bodies determine the installation position of the bolt sleeve assembly ;

installing the bolt sleeves, placing the bolt sleeves between two adjacent interposers respectively, and keeping them fixed on the outer glass fiber layer;

Install the lightweight bar, and insert the lightweight bar into the end of the bolt sleeve assembly close to the top of the wind turbine blade;

laying an inner glass fiber layer, the inner glass fiber layer covers the bolt sleeve assembly and the insert;

Infusion molding, pouring resin into the mold, heating and curing.

According to an embodiment of the present invention, in the step of installing the bolt sleeve, a fiber layer is laid between the bolt sleeve and the insert body, so as to reserve a glue injection path.

According to an embodiment of the present invention, wherein the radial cross-section of the lightweight strip is gradually reduced toward the direction of the blade tip.

According to an embodiment of the present invention, a fiber-reinforced resin layer is formed on the outer periphery of the bolt sleeve assembly, and the fiber-reinforced resin layer covers and fixes the bolt sleeve assembly, and this layer of fiber-reinforced resin layer is integrally formed with the body .

According to an embodiment of the present invention, the inner diameter of the end portion of the body facing the direction of the blade tip gradually increases outward.

According to an embodiment of the present invention, the root-side end of the lightweight material layer is spaced from the root-side end surface of the wind turbine blade by a certain distance, and the blade root-side end of the lightweight material layer has a slope, and the inside of the slope is The edge extends toward the blade root side, and the outer edge of the slope extends toward the blade tip side; the fiber reinforced composite material of the body is matched with the slope.

According to an embodiment of the present invention, wherein the insert body is a split type or a plurality of integrally formed prefabricated parts, the shape of at least one side of the insert between the two bolt sleeve assemblies matches the shape of the bolt sleeve.

According to an embodiment of the present invention, the radial height of the inner insert body is less than or equal to 2/3 of the diameter of the bolt sleeve.

According to one embodiment of the present invention, the insert body is formed by pultrusion or compression molding, and the insert body is made of fiber-reinforced resin, wherein the fiber is glass fiber or carbon fiber, and the resin is thermosetting resin or thermoplastic resin; The length of the insert body is greater than the length of the embedded bolt sleeve.

According to an embodiment of the present invention, the shape of the radially outer end surface of the insert body is a plane or an arc surface, and at least one end is aligned with the fiber reinforced resin material outside the bolt sleeve.

It can be seen from the above technical solutions that the advantages and positive effects of the production method of the lightweight blade root structure of wind power blades according to the embodiment of the present invention are:

Compared with the blade root structure in the prior art, the root structure of the wind power blade produced by the embodiment of the present invention is lighter in weight, and the interface protection and production efficiency are improved. , replacing the fiber reinforced material in part of the outer skin, the weight of the blade will be significantly reduced. In the direction of the blade tip of the pre-embedded bolt sleeve, the winding degree is increased by gradually reducing the cross section, and the material density of the bolt sleeve at this place reaches 7800Kg/m3, which can greatly reduce the weight. By replacing a part of the fiberglass or metal material of the blade root with a lightweight material with a density lower than that of epoxy resin or unsaturated polyester fiberglass, the weight of the blade is lighter under the same power generation condition.

It is also possible to replace part of the blade root layup with prefabricated parts to reduce the layup time and improve the utilization rate of the mold.

Structurally, it can protect lightweight materials from water and oil corrosion, and better protect the external interface of bolt sleeves.

In the blade root structure in the embodiment of the present invention, in the area where the bolt sleeve has a large degree of winding in the direction of the blade tip, or in the area outside the drawing force, 60-300Kg/ ^m3 light material is used instead of FRP material, so that the blade structure is more refined Lightweight.

Description of drawings

Various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals designate the same or similar parts throughout. in:

Fig. 1 is a schematic diagram of an outline structure of a root structure of a wind power blade according to an exemplary embodiment.

Fig. 2 is a partially cutaway structural schematic diagram of a root structure of a wind power blade according to an exemplary embodiment.

Fig. 3 is a partially cut-away structural schematic diagram of a blade root structure of a wind power blade according to an exemplary embodiment.

FIG. 4 is an enlarged schematic diagram of point A in FIG. 3 .

Fig. 5 is a schematic cross-sectional structure diagram of a single side of a blade root structure of a wind power blade according to an exemplary embodiment.

Fig. 6 is a schematic diagram showing an exploded structure of a bolt sleeve assembly of a wind turbine blade root structure according to an exemplary embodiment.

Wherein, the reference signs are explained as follows:

1. Body; 2. Bolt sleeve assembly; 21. Bolt sleeve; 22. Lightweight bar; 3. Insert body; 4. Lightweight material layer.

detailed description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

Fig. 1 is a schematic diagram of an outline structure of a root structure of a wind power blade according to an exemplary embodiment. Fig. 2 is a partially cutaway structural schematic diagram of a root structure of a wind power blade according to an exemplary embodiment. Fig. 3 is a partially cut-away structural schematic diagram of a blade root structure of a wind power blade according to an exemplary embodiment.

As shown in the figure, the embodiment of the present invention provides a wind turbine blade root structure, which mainly includes a body 1 of fiber reinforced composite material, the body forms the shape of the blade root structure, and wraps and fixes a plurality of bolt sleeve assemblies 2 inside. Wherein, there are multiple lightweight material inserts 3 and lightweight material layers 4 inside the body. A plurality of the bolt sleeve assemblies 2 are arranged at intervals along the blade root circumferential direction, and the arrangement of the bolt sleeve assemblies 2 is set corresponding to the corresponding fixing structure of the hub of the generator. Each bolt sleeve assembly 2 has a bolt sleeve 21 and a lightweight strip 22 respectively, and the light strip 22 is inserted into the end of the bolt sleeve 21 facing the blade tip; the insert body 3 is correspondingly arranged on each The outer spaced position of the bolt sleeve assembly 2 fills the space between each substantially cylindrical bolt sleeve assembly 2 , and the light material layer 4 is arranged on the outer side of the bolt sleeve assembly 2 and the body 1 Between the outer surfaces, the root-side end of the lightweight material layer 4 is spaced from the root-side end surface of the wind turbine blade by a certain distance, so that the fiber-reinforced composite material of the main body 1 can be molded and solidified in the space to form a larger structure Strong end face structure.

According to common knowledge in the field, the blade root direction refers to the direction of the generator hub where the blade is fixed, and the blade tip direction generally refers to the direction opposite to the blade root direction and points to the outer tip of the blade. The radially outer side mentioned in this specification refers to the side away from the center of the blade root, and the radially inner side refers to the side relatively closer to the center of the blade root.

The aforementioned lightweight materials can be lightweight materials such as lightweight foamed plastics, glass microbeads, light fiberglass, wood or bamboo, which are conducive to reducing weight and cost while filling and fixing. Lightweight wood such as balsa wood; foamed plastics such as PET, PVC and other foam materials. It can be understood by those skilled in the art that various easy-to-form industrial materials with a density lower than 300Kg/m3 can be selected as light-weight materials.

Compared with the existing blade structure, the structure of the embodiment of the present invention is lighter, and the interface protection and production efficiency are improved. The structure of the embodiment of the present invention replaces a part of the fiberglass or metal material of the blade root with a lightweight material with a density lower than that of epoxy resin or unsaturated polyester fiberglass, so that the weight of the blade is lighter under the same power generation condition. The structure of the embodiment of the present invention replaces part of the blade root layup with the prefabricated molding to reduce the layup time and improve the utilization rate of the mold. The present invention can protect lightweight materials from water and oil erosion structurally, and better protect the external interface of the bolt sleeve 21 .

FIG. 4 is an enlarged schematic diagram of point A in FIG. 3 . Fig. 5 is a schematic cross-sectional structure diagram of a single side of a blade root structure of a wind power blade according to an exemplary embodiment. Fig. 6 is a schematic diagram showing an exploded structure of a bolt sleeve assembly of a wind turbine blade root structure according to an exemplary embodiment.

As shown in the figure, according to an embodiment, the inner diameter of the end portion of the bolt sleeve 21 facing the blade tip direction is selected to be in an increasing shape, and the outer diameter of the bolt sleeve 21 is gradually increasing facing the blade tip direction. It not only achieves light weight, but also increases the frictional force against pulling out. The inner diameter of the end portion of the body facing the direction of the blade tip gradually increases outwards, so as to achieve light weight. The radial cross-section of the lightweight strip 22 in the bolt sleeve assembly 2 decreases gradually toward the blade tip, one side matches the gradually opening shape of the inner surface of the blade tip side of the body 1 , and the weight of the two sides can also be reduced.

There are gaps between the outer circumference of the bolt cover assembly 2 and adjacent components, so as to form a layer of fiber reinforced resin, which is adapted to the shape of the bolt cover assembly 2 and completely covered.

The end of the lightweight material layer 4 on the blade root side has an inclined surface, the inner edge of the inclined surface extends toward the blade root side, and the outer edge of the inclined surface extends toward the blade tip side, that is, the end portion forms a tapered shape with a large inside and a small outside; The fiber-reinforced composite material of the main body 1 is matched with the inclined surface, and the bonding strength of the two is enhanced by the inclined surface, and the tapered shape with a large inside and a small outside can make the fiber-reinforced composite material have an inward fixing effect on the lightweight material layer 4 after forming. . This fiber-reinforced resin layer can optionally be formed in one pass by compression molding.

Referring to Fig. 1 and Fig. 2, the insert body 3 can be a split type or a multi-unit integrally formed prefabricated part, and the shape of at least one side of the insert body matches the shape of the bolt sleeve 21 . In this embodiment, the two sides are an arc that matches the shape of the bolt sleeve 21 as an example. In this way, the light material insert can fill the space between the bolt sleeve 21 and the fiber-reinforced resin of the outer skin. The radial height of the insert body 3 is selected to be less than or equal to 3/4 of the diameter of the bolt sleeve 21, so that the fiber-reinforced composite material of the body 1 wraps the fixed bolt sleeve 21 from the inside to the outside, and at the same time improves the spreading efficiency , Reduce fabric wrinkles. Moreover, the inner end surface of the insert body 3 may be arc-shaped, so as to be firmly combined with the fiber-reinforced composite material formed after the main body 1 .

Furthermore, the insert body 3 is selected as pultrusion molding or compression molding, and is prefabricated in advance, while the split insert body 3 can be mass-produced quickly with a uniform shape, and the mold used is relatively small, greatly Reduce tooling costs. On the other hand, if the interposer 3 is integrally formed by multiple units, the production speed and assembly speed can be improved. The insert body 3 is made of fiber-reinforced resin, wherein the fiber is selected as glass fiber or carbon fiber, and the resin is selected as thermosetting resin or thermoplastic resin. The length of the insert body 3 is selected to be greater than the length of the embedded bolt sleeve 21 so that the insert body 3 overlaps the bolt sleeve 21 and the lightweight strip 22 at the same time. The shape of the radially outer end surface of the insert body 3 is a plane or an arc surface, and at least the outer end is aligned with the fiber-reinforced resin material on the outside of the bolt sleeve 21. A more advanced example is that the two outer ends of the insert body 3 are just aligned with the two The outer circumferences of adjacent bolt sleeves 21 are tangent, so that the outer sides of a plurality of inserts 3 can form a complete circle, so that the force can be transmitted evenly, and the inner structure of the inner inserts 3 can be used to ensure the stability of the bolt sleeves. The 21 outsides are evenly fixed and compressed.

According to the above-mentioned embodiment, a plurality of bolt sleeve assemblies 2 can be fixed by using the body 1, and at the same time, the lightweight strip 22 and the lightweight material layer 4 of the outer layer can greatly reduce the overall weight of the blade root structure, and the lightweight strip The parts 22 and the outer lightweight material layer 4 only replace the materials that do not affect the structural strength, and will not affect the structural strength of the blade root. Moreover, the prefabricated insert body 3 can also better ensure that the bolt sleeve 21 The strength of the outer molding structure avoids the problem of stress concentration. At the same time, since most of the components in the body 1 are prefabricated, it can be completed by molding or a relatively simplified lay-up process in production. At the same time, there is no large volume of area to be cured, and it also has the advantage of fast curing.

The embodiment of the present invention also provides a method for constructing a root structure of a wind power blade, comprising the following steps:

Provide a mold that can be used to shape the root structure of wind power blades;

laying an outer glass fiber layer and a lightweight material layer 4, and laying an outer glass fiber layer and a lightweight material layer 4 at a position corresponding to the outer wall of the root structure in the mold;

Install the insert body 3, respectively place the insert body 3 inside the lightweight material layer 4, so that the outer surface of the insert body 3 is tiled on the light material layer 4, and two adjacent insert bodies 3 determine the bolts The installation position of the kit;

Install bolt sleeves 21, place the bolt sleeves 21 between two adjacent interposers 3 respectively, and keep them fixed on the outer glass fiber layer, optional between the bolt sleeves 21 and the interposers 3 Lay the fiber layer to leave a glue injection channel;

Install the lightweight strip 22, and plug the lightweight strip 22 into the end of the bolt sleeve assembly 2 close to the top of the wind power blade;

Repeat the step 2 of installing the bolt set assembly and the step 3 of the insert body until all the bolt set assemblies 2 and the insert body 3 are installed;

laying an inner glass fiber layer, the inner glass fiber layer covers the bolt sleeve assembly and the insert body 3;

Infusion molding, pouring resin into the mold, heating and curing.

The blade root structure in the embodiment of the present invention is lighter than the blade root structure in the prior art, and the interface protection and production efficiency are improved. In the embodiment of the present invention, the same volume density is about one tenth of the material. Substituting fiber reinforcements for parts of the outer skin will result in a significant reduction in blade weight. It increases the degree of winding in the direction of the tip of the embedded bolt sleeve by gradually reducing the cross section, and the material density of the bolt sleeve at this point reaches 7800Kg/m3. By replacing a part of the fiberglass or metal material of the blade root with a lightweight material with a density lower than that of epoxy resin or unsaturated polyester fiberglass, the weight of the blade is lighter under the same power generation condition.

By using prefabricated parts such as the lightweight strip 22 and the insert body 3, part of the blade root layup can also be replaced by the prefabricated shaped part to reduce the layup time and improve the utilization rate of the mold.

Moreover, the light weight is wrapped in the skin, which can protect the light weight material from water and oil corrosion structurally, and at the same time better protect the external interface of the bolt sleeve.

In the blade root structure in the embodiment of the present invention, the FRP material is replaced by light-weight materials with a density lower than 300Kg/m ³ in the region where the bolt sleeve has a large disturbance in the direction of the blade tip or the region that meets the pull-out force, so that the blade structure is finer and lighter. quantity.

It is to be understood that the features discussed in the various embodiments are interchangeable where possible.

Although the present invention has been described in detail above, it is clear that various modifications and changes can be made without departing from the scope of the invention.

When describing elements of the invention or preferred embodiments of the invention, the words "a", "an", "the" and "said" are intended to mean that there are one or more of the elements. The terms "comprising", "comprising", and "having" and the like are intended to be open-ended and mean that other elements may be present other than the listed elements.

In view of the foregoing, it will be seen that the several objects of the invention are achieved and other beneficial results obtained.

As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims (10)

1. A production method for a lightweight blade root structure of a wind power blade, the blade root structure includes a body of fiber reinforced composite material, and the body wraps and fixes a plurality of bolt sleeve assemblies inside, it is characterized in that the body has a lightweight material inner The insert body and the lightweight material layer; wherein the production method of the lightweight blade root structure includes the following steps: Configure a forming mold; Laying an outer glass fiber layer and a lightweight material layer, laying an outer glass fiber layer and a lightweight material layer at a position corresponding to the outer wall of the root structure in the mold; Install the insert body, place multiple insert bodies on the inner side of the light material layer, so that the outer surface of the insert body is tiled on the light material layer, and two adjacent insert bodies determine the installation position of the bolt sleeve assembly ; installing the bolt sleeves, placing the bolt sleeves between two adjacent interposers respectively, and keeping them fixed on the outer glass fiber layer; Install the lightweight bar, and insert the lightweight bar into the end of the bolt sleeve assembly close to the top of the wind turbine blade; laying an inner glass fiber layer, the inner glass fiber layer covers the bolt sleeve assembly and the insert; Infusion molding, pouring resin into the mold, heating and curing. 2. The method for producing lightweight blade root structure of wind power blades according to claim 1, characterized in that, in the step of installing the bolt sleeve, a fiber layer is laid between the bolt sleeve and the insert to leave out of the dispensing channel and prevent resin build-up. 3 . The method for producing a lightweight root structure of a wind turbine blade according to claim 1 , wherein the radial cross-section of the lightweight strip decreases gradually toward the blade tip. 4 . 4. The method for producing a lightweight blade root structure for wind turbine blades according to claim 1, wherein a fiber-reinforced resin layer is formed on the outer periphery of the bolt sleeve assembly, and the fiber-reinforced resin layer covers and fixes the bolt sleeve assembly , this layer of fiber-reinforced resin is integrally formed with the body. 5 . The method for producing a lightweight root structure of a wind turbine blade according to claim 1 , wherein the inner diameter of the end portion of the body facing the direction of the blade tip increases outwards. 6 . 6. The method for producing a lightweight blade root structure of a wind turbine blade according to claim 1, wherein the root side end of the lightweight material layer is spaced from the end surface of the blade root of the wind turbine blade by a certain distance, and the lightweight The end of the material layer on the blade root side has an inclined plane, an example is that the inner edge of the inclined plane extends toward the blade root side, and the outer edge of the inclined plane extends toward the blade tip side; the fiber-reinforced composite material of the body is mated with the inclined plane. 7. The method for producing a lightweight blade root structure for wind turbine blades according to claim 1, wherein the insert body is a split-type or multi-unit integrally formed prefabricated part, and the inner insert between two bolt sleeve assemblies The insert has at least one side whose shape matches the shape of the bolt sleeve. 8. The method for producing a lightweight root structure of a wind turbine blade according to claim 1, wherein the radial height of the insert body is less than or equal to 3/4 of the outer diameter of the bolt sleeve. 9. The method for producing a lightweight root structure of a wind turbine blade according to any one of claims 1 to 8, wherein the insert is formed by pultrusion or compression molding, and the insert is made of fiber-reinforced resin Material, wherein the fiber is glass fiber or carbon fiber, and the resin is thermosetting resin or thermoplastic resin; the length of the insert body is greater than the length of the pre-embedded bolt sleeve. 10. The method for producing a lightweight root structure of a wind turbine blade according to any one of claims 1 to 8, wherein the shape of the radially upper and outer end surface of the insert body is a plane or an arc surface, and at least one end is connected to the bolt sleeve Alignment of outer fiber reinforced resin material.