CN109322784B

CN109322784B - Front edge component of blade for wind generating set, blade and impeller

Info

Publication number: CN109322784B
Application number: CN201811510101.8A
Authority: CN
Inventors: 陈威; 杨建军; 肖智龙
Original assignee: Jiangsu Goldwind Science and Technology Co Ltd
Current assignee: Jiangsu Goldwind Science and Technology Co Ltd
Priority date: 2018-12-11
Filing date: 2018-12-11
Publication date: 2023-05-09
Anticipated expiration: 2038-12-11
Also published as: CN109322784A

Abstract

The invention relates to a leading edge member for a blade of a wind power plant, comprising: the leading edge member can cover the leading edge region of the blade shell body, and the leading edge member comprises an inner surface and an outer surface, wherein the inner surface is provided with a connecting part protruding out of the inner surface for being inserted into the joint of the pressure surface and the suction surface of the leading edge region of the blade shell body. The pneumatic performance influence and the structural performance influence of the blade caused by overlarge die closing gap, misplacement of front and rear edges and the like in the traditional blade production process are eliminated.

Description

Front edge component of blade for wind generating set, blade and impeller

Technical Field

The invention relates to the field of wind power generation, in particular to the field of leading edge components, blades and impellers of blades for a wind generating set.

Background

Currently, as shown in fig. 1, the blade 10 is produced by bonding the pressure surface 12 (PS) and the suction surface 11 (SS) of the blade 10 after being respectively layered, poured and cured, so as to form a complete blade shell.

With current production processes, the problem of closing the blade 10 is common. Referring to fig. 2a and 2b together, fig. 2a is a schematic partial structure at a in fig. 1, and fig. 2b is a schematic partial structure at a in fig. 1. In the process of clamping the blade 10, as shown in fig. 2a, the problem that the gap between the PS surface and the SS surface is too large due to the layering and polishing repair errors of the PS surface or the SS surface or the gap between the PS surface and the SS surface is larger due to the fact that the PS surface and the SS surface cannot be effectively close to each other due to the problems of too much adhesive glue and the like often occurs; alternatively, as shown in fig. 2b, the PS surface and the SS surface may have a problem of mold clamping misalignment due to a relative misalignment of the leading edges of the PS surface and the SS surface in the chord direction due to a shape error or a mold error.

These problems cause deviations of the blade shell from the originally designed blade structure and aerodynamic properties, which in turn affect the final performance of the blade, resulting in a reduced power production of the wind turbine.

Disclosure of Invention

According to the embodiment of the invention, the front edge component of the blade for the wind generating set is provided, and the problems of overlarge die closing gap or dislocation of the blade and the like are solved.

In one aspect, according to an embodiment of the present invention, a leading edge member for a blade of a wind power plant is provided, the leading edge member being capable of covering a leading edge region of a blade shell body, and the leading edge member comprises an inner surface and an outer surface, the inner surface being provided with a connection portion protruding from the inner surface for plugging at a junction of a pressure surface and a suction surface of the leading edge region of the blade shell body.

According to one aspect of an embodiment of the invention, the leading edge member has a chordwise cross-sectional length along the blade that is 20% -40% of the chordwise cross-sectional length of the blade.

According to one aspect of an embodiment of the invention, the leading edge member tapers in thickness at the end in the chord direction of the blade to smoothly transition with the blade shell surface.

According to one aspect of the embodiment of the invention, the connection parts are continuously or alternately distributed along the axial direction of the blade, and the cross section of the connection parts along the chord direction of the blade is rectangular, wedge-shaped, triangular, arc-shaped or T-shaped.

According to an aspect of an embodiment of the present invention, the leading edge member includes a heating portion which is built in the leading edge member, and a heating range of the heating portion substantially covers the surface of the leading edge member.

According to one aspect of the embodiment of the invention, the heating part is one or a combination of more than two of a metal heating film, a carbon fiber material and glass fiber material mixed heating film, a heating wire, a pre-buried heat conduction fluid channel and a pre-buried chemical reaction exothermic substance.

According to an aspect of an embodiment of the present invention, the leading edge member includes an inner fiber lay-up, a heating portion, an insulating layer, a lightning protection portion, and an outer fiber lay-up in this order from the inner surface to the outer surface, and the leading edge member is preformed by a vacuum infusion process, a prepreg curing process, or an injection molding process.

According to one aspect of the embodiment of the invention, the power line and/or the ground line of the heating part and the lightning protection part are fixedly arranged along the inner fiber layer, are pre-buried in the connecting part, and can be introduced into the blade cavity through the connecting part.

According to one aspect of an embodiment of the invention, the leading edge member outer surface is provided with icing sensors and/or temperature sensors for detecting leading edge icing conditions.

According to one aspect of the embodiment of the invention, the front edge components are arranged in a sectional mode along the axial direction of the blade, and each front edge component is formed by splicing a plurality of mutually independent front edge component units, and adjacent sectional end faces are not connected.

In another aspect, an embodiment according to the present invention provides a blade comprising any of the above-mentioned leading edge members, wherein the leading edge members cover a leading edge region attached to the outer shell of the blade.

According to one aspect of the embodiment of the invention, the front edge component can be prefabricated in advance and then mounted on the blade, or the front edge component can be formed by directly paving a layer on the corresponding area of the front edge of the blade after die assembly.

According to one aspect of an embodiment of the invention, the blade is formed by at least one of the following methods: reserving a certain thickness in the front edge area in the shell layering process of the blade, and installing and fixing a front edge component in the front edge area of the blade after the shell of the blade is clamped; after the shell of the blade is assembled, polishing the front edge area of the blade, and installing and fixing the front edge component on the front edge area of the blade; after the shell of the blade is assembled, the front edge component is directly fixed on the front edge area of the blade.

In yet another aspect, an embodiment of the present invention provides an impeller for a wind turbine generator, including the blade described above.

In summary, the beneficial effects of the embodiments of the present invention at least include the following:

1) The front edge component is additionally arranged, so that the whole outer surface of the blade shell forms a smooth continuous surface, the structure and the pneumatic performance of the blade are corrected, and the pneumatic performance influence and the structural performance influence of the blade caused by overlarge die closing gaps, front and rear edge dislocation and the like in the traditional blade production process are eliminated;

2) The thickness of the front edge component is thinner, so that the front edge component has the characteristics of high strength and high toughness, and the arc or arch deformation size of the front edge component on the section is larger, thereby being convenient for the attachment, installation and fixation of the front edge component and the surface of the blade shell;

3) The length of the chord-wise section of the front edge component along the blade is preferably 20% -25% of the length of the chord-wise section of the blade, which is beneficial to the balance weight of the front edge and the rear edge of the blade, and on the other hand, the volume of the front edge component can be reduced, which is convenient for the production and the installation of the front edge component;

4) The front edge component is in thickness taper at the end part along the chord direction of the blade, so that the contact area of the front edge component and the blade can be increased, and the front edge component can be tightly attached, so that the front edge component is firmly installed on the blade shell;

5) The connecting part protruding out of the inner surface is arranged on the inner surface of the front edge component, the original mode of bonding by normal force is changed into the mode of combining normal force and shearing force, and the front edge cracking risk caused by overlarge die clamping thickness is eliminated;

6) The heating part is arranged in the front edge component, so that the front edge component has the function of deicing the blade, and the advantages of the front edge component are utilized to realize the rapid manufacturing and the later transformation of the heated deicing blade;

7) The quality risk and reworking caused by the conduction of the lightning protection net and the heating film after the production of the traditional heating deicing blade are avoided, and the resistance measurement can be directly carried out after the front edge component is manufactured;

8) The front edge component is made into a sectional form, so that the front edge component is more beneficial to transportation and installation, and when the heating part is arranged in the front edge component, independent heating deicing of each region can be realized, and the energy waste caused by large-scale heating is avoided.

Drawings

The invention will be better understood from the following description of specific embodiments thereof, taken in conjunction with the accompanying drawings, in which:

other features, objects and advantages of the present invention will become more apparent upon reading the following detailed description of non-limiting embodiments thereof, taken in conjunction with the accompanying drawings in which like or similar reference characters designate the same or similar features.

FIG. 1 is a schematic cross-sectional view of a prior art blade along the chord direction;

FIG. 2a is a schematic view of the partial structure at A in FIG. 1;

FIG. 2b is a schematic view of the partial structure at A in FIG. 1;

FIG. 3 is a schematic view of a wind turbine blade according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a preformed leading edge component of an embodiment of the invention;

FIG. 5 is a partial schematic structural view at B of FIG. 3 in accordance with an embodiment of the present invention;

FIG. 6 is a partial schematic structural view at C of FIG. 3 in accordance with an embodiment of the present invention;

fig. 7 is a schematic structural view of a front edge member with a built-in heating portion according to an embodiment of the present invention.

Reference numerals illustrate:

10-leaf blade; 11-suction surface; 12-pressure surface; 13-die closing gap; 14-die closing deviation; 15-bonding glue;

20-a leading edge member; 21-a connection; 22-the end of the leading edge member; 23-inner fiber lay-up; 24-a heating part; 25-an insulating layer; 26-lightning protection part; 27-outer fibre lay-up

Detailed Description

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order not to unnecessarily obscure the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structures of the dust removing device and the yaw brake apparatus of the present invention. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

According to the embodiment of the invention, the front edge component of the blade for the wind generating set is provided, the front edge component can cover the front edge area of the outer shell of the blade, the front edge component comprises an inner surface and an outer surface, and a connecting part protruding out of the inner surface is arranged on the inner surface and is used for being inserted into the joint of the pressure surface and the suction surface of the front edge area of the outer shell of the blade.

For a better understanding of the invention, the leading edge member of a blade for a wind power plant is described in detail below in connection with fig. 3 to 7.

Referring to fig. 3, fig. 3 is a schematic structural view of a wind turbine blade according to an embodiment of the invention.

Blade 10 of a wind power plant, comprising: a first outer shell member and a second outer shell member, the outer shell members being joined together to form the outer shell of the blade 10; the leading edge member 20, the leading edge member 20 being capable of covering a leading edge region attached to the outer shell of the blade 10.

Illustratively, in this embodiment, the first outer shell member is the suction surface 11 (SS surface) of the blade 10, the second outer shell member is the pressure surface 12 (PS surface) of the blade 10, and when the blade 10 is clamped, the suction surface 11 (SS surface) of the blade 10 and the pressure surface 12 (PS surface) of the blade 10 are buckled together, so that the front edges of the two shells are connected and fixed together, and the rear edges of the two shells are connected and fixed together, thereby forming a complete blade shell. At this time, the gap at the connecting position of the shell, which is caused by the mold closing of the blades, is large, or the deviation occurs at the connecting position of the shell, so that the outer surface of the finally formed blade shell is discontinuous or not smooth, the deviation occurs between the structure and the pneumatic performance of the blade 10 at the beginning of the design, and the generating capacity of the wind generating set is affected. At this time, the front edge member 20 is fixed to the front edge region of the blade shell to cover the front edge region of the outer shell of the blade 10, so that the risk of deformation of the airfoil of the blade 10 caused by the adhesion of the suction surface 11 and the pressure surface 12 at the front edge due to the die clamping gap or dislocation is eliminated, that is, the dislocated front edge or the front edge with the gap is wrapped in the front edge member 20, and at this time, the aerodynamic shape of the front edge of the blade 10 is the front edge member 20. By adding the leading edge member 20, the overall outer surface of the blade shell is formed into a smooth continuous surface, modifying the structural and aerodynamic properties of the blade 10.

Specifically, the leading edge member 20 may be prefabricated in advance and then mounted on the corresponding area of the leading edge of the blade shell, or the fiber layer may be directly laid on the corresponding area of the leading edge of the blade shell after mold clamping to form the leading edge member 20.

Specifically, the leading edge member 20 in the present embodiment is only a part of the leading edge of the blade 10, and since one of the purposes of the leading edge member 20 is to repair the blade 10, the number of layers of the inner fiber lay-up 23 and the outer fiber lay-up 27 of the leading edge member 20 is small, for example, two to three layers may be laid separately, so long as a smooth continuous surface after curing can be achieved. The thickness is thin, so that the front edge member 20 has the characteristics of high strength and high toughness, and the arc or arc-shaped deformation size of the front edge member 20 on the section is large, so that the front edge member 20 and the surface of the blade shell are convenient to attach, install and fix.

Illustratively, the leading edge member 20 may be secured to the blade shell surface by bonding, binding, riveting, or the like. Of course, the present embodiment is not limited to these mounting forms, and any form is possible as long as the leading edge member 20 and the blade shell can be firmly fixed, and the loosening does not occur, and the aerodynamic shape of the blade 10 is not affected.

Specifically, after installation, the leading edge member 20 has a chordwise cross-sectional length along the blade 10 that is 20% -40% of the chordwise cross-sectional length of the blade 10. Since the airfoil pitch moment center of the blade 10 is generally located 20% -25% from the airfoil leading edge chord length, a leading edge member 20 length less than 25% is advantageous for blade 10 leading and trailing edge weighting on the one hand, and the leading edge member 20 can be reduced in volume for production and installation of the leading edge member 20 on the other hand, so that it is preferable that the chord-wise cross-sectional length of the leading edge member 20 along the blade 10 is 20% -25% of the chord-wise cross-sectional length of the blade 10.

Please refer to fig. 4, fig. 5 and fig. 6 together. Wherein FIG. 4 is a schematic view of the structure of a preformed leading edge member 20 according to an embodiment of the present invention; FIG. 5 is a partial schematic structural view at B of FIG. 3 in accordance with an embodiment of the present invention; fig. 6 is a partial structural diagram of fig. 3 at C according to an embodiment of the present invention.

Taking the prefabricated front edge component 20 as an example, the front edge component 20 is in a thin-wall arched structure as a whole, and the end parts of the front edge component 20 are in right-angle butt joint or oblique-angle butt joint with the blade shell.

For easy disassembly, the leading edge member 20 tapers in thickness at the end in the chord direction of the blade 10 to smoothly transition with the shell surface of the blade 10, avoiding the occurrence of a stepped effect on the surface of the blade 10. Illustratively, the ends of the leading edge members 20 may be tapered from the inner surface to the outer surface of the leading edge members 20 to form a slope that matches the shell of the blade 10, thus allowing for increased contact area and a tighter fit, thereby providing a secure mounting of the leading edge members 20 to the shell of the blade 10 and avoiding the risk of stress and turbulence at non-smooth locations.

In order to increase the reliability of the connection, the inner surface of the leading edge member 20 is provided with a connection portion 21 protruding from the inner surface for plugging in the junction of the pressure surface and the suction surface of the leading edge region of the shell of the blade 10. The connection portions 21 are continuously distributed or distributed at intervals along the axial direction of the blade 10, and the cross section of the connection portions 21 along the chord direction of the blade 10 is rectangular, wedge-shaped, triangular, arc-shaped or T-shaped, and then is adhered and fixed with the blade shell through the adhesive 15. Preferably, the connecting portion 21 has a wedge-shaped structure, so that the leading edge member 20 itself can be firmly fitted to the blade shell, and is not easily detached. And, through the connection of leading edge component 20 and blade shell leading edge gap, change the mode that originally only passes through normal force bonding into normal force and shearing force combination mode, eliminate the leading edge fracture risk that the compound die thickness is too big.

When the wind generating set is installed in a region which is easily frozen, such as a cold region and a high humidity region, the front edge surface of the blade 10 is frozen, and in order to keep the blade 10 in a good aerodynamic shape, the blade 10 needs to be deiced. The heating part 24 is arranged in the front edge member 20, and the heating range of the heating part 24 basically covers the surface of the front edge member 20, so that the deicing function of the blade 10 is well realized. The heating part 24 is built in the front edge member 20, so that the front edge member 20 has the function of deicing the blade 10, and the advantages of the front edge member 20 are utilized to realize rapid manufacturing and later modification of the heated deicing blade 10.

Specifically, referring to fig. 7, fig. 7 is a schematic structural diagram of the front edge member 20 with the built-in heating portion 24 according to the embodiment of the present invention.

The front edge member 20 comprises an inner fiber lay-up 23, a heating portion 24, an insulating layer 25, a lightning protection portion 26 and an outer fiber lay-up 27 from the inner surface to the outer surface in this order, wherein the insulating layer 25 is used for insulating the heating portion 24 and the lightning protection portion 26 from electrical conduction damage. The leading edge member 20 may be preformed by a vacuum infusion process or an injection molding process. The prefabricated front edge component 20 avoids the quality risk and reworking caused by the fact that the lightning protection net is conducted with the heating film after the traditional heating deicing blade 10 is produced, and the resistance measurement can be directly carried out after the front edge component 20 is produced.

Specifically, the heating portion 24 may be one or a combination of two or more of a metal heating film, a carbon fiber glass fiber mixed heating film, a heating wire, a pre-buried heat conduction fluid channel, a pre-buried chemical heat release substance, and the like. Wherein, the pre-buried chemical exothermic material can be supersaturated solution, such as sodium acetate.

Specifically, the lightning protection portion 26 may be a lightning protection metal mesh, a lightning protection belt, or the like.

The manufacturing process and the wiring method are illustrated by taking the heating part 24 as a heating film and the lightning protection part 26 as a lightning protection copper net.

Specifically, the front edge member 20 mainly adopts the process modes of vacuum infusion, prepreg curing or high-pressure injection molding and the like of composite materials, wherein the main materials are a heating film and a lightning protection copper mesh, the auxiliary materials are glass fiber cloth, resin and the like, and insulation is needed between the heating film and the lightning protection copper mesh. In FIG. 7, 2-3 layers of inner glass fiber cloth, heating films, insulation, lightning protection copper mesh and outer glass fiber cloth are sequentially arranged from right to left, and finally vacuum pouring and curing are carried out; or 2-3 layers of inner glass fiber cloth prepreg, heating film, insulating prepreg, lightning protection copper net and outer glass fiber cloth prepreg in sequence from right to left, and finally, directly curing and forming; or firstly placing the heating film on the bottom layer, paving an insulating material in the middle, paving a lightning protection copper net, and finally performing injection molding and solidification.

When the heating film and/or the lightning protection copper mesh are/is arranged in the front edge member 20, a heating film power line or a lightning protection copper mesh ground line can be pre-buried in the connecting part 21 of the front edge member 20 and can be introduced into the cavity of the blade 10 through the connecting part 21; alternatively, it is fixedly disposed along one side of the outer periphery of the connection portion 21, and can be introduced into the cavity of the blade 10 via the connection portion 21. Through the wiring mode of this embodiment, reduced deicing in the prior art and walked the influence of line to blade aerodynamic performance from the blade surface.

Further, a sensor (not shown in the drawings) may be arranged at the outer surface of the leading edge member 20 for detecting surface icing conditions, for example, an icing sensor or a temperature sensor or the like may be arranged. When the sensor acquires the icing signal, the icing signal is transmitted to the heating controller or the main controller, so that automatic control of heating and deicing is realized; the wiring mode of the sensor signal transmission line can be the same as that of the lightning protection copper net grounding and/or heating film power line.

Specifically, the icing sensor needs to be disposed on the surface of the leading edge member 20 due to its working characteristics so as to be in direct contact with the external natural environment, and when the icing sensor is large in volume, the icing sensor may also be disposed on the top of the nacelle of the wind turbine generator set, so as to reduce the influence on the aerodynamic performance of the blade 10; the temperature sensor may be disposed on the surface of the leading edge member 20 or may be embedded within the layup of the leading edge member 20 during the formation of the leading edge member 20.

For example, the icing sensor may be a direct detection type sensor and/or an indirect detection type sensor. Illustratively, the direct detection type sensor may detect by optical, electrical, etc. means. For example, the optical sensor detects whether the blade surface is frozen according to the difference of optical properties of ice, water and air, and the electrical icing sensor detects whether the blade surface is frozen according to the difference of electrical properties of ice, air and water. The indirect detection type sensor can calculate whether the ice is frozen or not by measuring conditions such as air humidity, temperature, relative movement speed of the blade and the sensor and the like.

Specifically, when the temperature acquisition signal T1, the local wind speed signal Vw, the local relative humidity RH, the local air pressure P, the impeller rotating speed R, the distance D between the temperature sensor and the center of the impeller, and other signals are sent to the wind turbine generator control system, and when the set condition is met, it can be determined that icing exists near the temperature sensor on the surface of the blade 10, the wind turbine generator control system starts the heating of the area, and after heating for 30 minutes, the temperature sensor is judged again according to the acquired signals; if the set condition is not reached, icing is considered to be eliminated, and thus one detection cycle is ended. After 30 minutes, restarting the wind generating set control system for detection, and circulating in this way; or the control system of the wind generating set can judge according to all signals acquired in real time, and when the set condition is met, the automatic heating is started. In particular, after these parameters are obtained, the vapor enthalpy-entropy diagram can be used to correspondingly find icing conditions.

It is understood that 30 minutes is only one value manually set, and other values are naturally set according to the local situation.

In each of the above embodiments, the leading edge member 20 is described as an integral component. Of course, the front edge member 20 may also be made into a segmented form, specifically, the front edge member 20 is arranged in a segmented manner along the axial direction of the blade 10, and is formed by splicing a plurality of mutually independent front edge members 20 units, and adjacent segmented end surfaces are not connected. In this way, not only is the transportation and installation facilitated, but also the individual heating and deicing of each region can be realized when the heating part 24 is arranged in the front edge member 20, and the energy waste caused by large-scale heating is avoided.

An embodiment of the present invention discloses a blade comprising a leading edge member 20 as described in any of the above, wherein the leading edge member 20 covers a leading edge region attached to the outer shell of the blade 10.

The leading edge member 20 may be prefabricated in advance and then attached to the blade 10, or may be directly laid in a region corresponding to the leading edge of the blade 10 after mold clamping, thereby forming the leading edge member 20.

The blade (10) is formed by at least one of the following methods: in the shell layering process of the blade 10, a certain thickness is reserved in the front edge area, and after the shell of the blade 10 is clamped, the front edge component 20 is installed and fixed in the front edge area of the blade 10; after the shell of the blade 10 is clamped, polishing the front edge area of the blade 10, and mounting and fixing the front edge member 20 to the front edge area of the blade 10; after the shell of the blade 10 is clamped, the leading edge member 20 is directly attached to the leading edge region of the blade 10.

Embodiments of the present invention also disclose an impeller for a wind power generator set, wherein the impeller comprises the blade 10 as described in any of the embodiments above. The specific advantageous effects are the same as those of the blade 10 described in the embodiments, and will not be described in detail herein.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different technical features presented in different embodiments may be combined to achieve advantageous effects. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in view of the drawings, the description, and the claims.

Claims

1. A leading edge member (20) for a blade (10) of a wind power plant, characterized in that the leading edge member (20) is capable of being covered on the outer surface of the leading edge region of the blade (10) outer shell for shaping the leading edge region of the blade (10), and that the leading edge member (20) comprises an inner surface and an outer surface, that the leading edge member (20) has a connecting portion (21) extending from the inner surface and protruding from the inner surface, and that the connecting portion (21) is integrally arranged with the leading edge member (20) for plugging in a junction of a pressure surface and a suction surface of the leading edge region of the blade (10) outer shell.

2. The leading edge member (20) according to claim 1, wherein a chordwise cross-sectional length of the leading edge member (20) along the blade (10) is 20% -40% of the chordwise cross-sectional length of the blade (10).

3. The leading edge member (20) according to claim 2, wherein the leading edge member (20) tapers in thickness at an end along a chord direction of the blade (10) to smoothly transition with a shell surface of the blade (10).

4. The leading edge member (20) according to claim 1, wherein the connection portions (21) are continuously or intermittently distributed along the axial direction of the blade (10), and a cross section of the connection portions (21) along the chord-wise direction of the blade (10) is rectangular, wedge-shaped, triangular, arc-shaped or T-shaped.

5. The leading edge member (20) according to any of claims 1 to 4, wherein the leading edge member (20) comprises a heating portion (24), the heating portion (24) is built into the leading edge member (20), and a heating range of the heating portion (24) substantially covers the surface of the leading edge member (20).

6. The leading edge component (20) of claim 5, wherein the heating portion (24) is one or a combination of two or more of a metal heating film, a carbon fiber material and glass fiber material mixed heating film, a heating wire, a pre-buried heat transfer fluid channel, and a pre-buried chemical reaction exothermic material.

7. The leading edge component (20) according to claim 6, wherein the leading edge component (20) comprises, in order from the inner surface to the outer surface, an inner fiber lay-up (23), a heating portion (24), an insulating layer (25), a lightning protection portion (26) and an outer fiber lay-up (27), the leading edge component (20) being preformed by a vacuum infusion process, a prepreg curing process or an injection molding process.

8. The leading edge component (20) according to claim 7, characterized in that the power and/or ground wires of the heating portion (24) and the lightning protection portion (26) are fixedly arranged along the inner fibre lay-up (23) and pre-buried in the connection portion (21) and can be led into the blade (10) cavity via the connection portion (21).

9. The leading edge member (20) according to claim 8, wherein an outer surface of the leading edge member (20) is provided with an icing sensor and/or a temperature sensor for detecting a leading edge icing condition.

10. The leading edge component (20) according to any of claims 1 to 4, 6 to 9, wherein the leading edge component (20) is arranged in a segmented manner along the axial direction of the blade (10), and is formed by splicing a plurality of mutually independent leading edge component units, and adjacent segmented end surfaces are not connected.

11. A blade comprising a leading edge member (20) according to any of claims 1-10, wherein the leading edge member (20) covers a leading edge area connected to the outer shell of the blade (10).

12. The blade (10) according to claim 11, wherein the leading edge member (20) is a preform; alternatively, a ply is directly laid on a region corresponding to the leading edge of the blade (10) after mold clamping, thereby forming the leading edge member (20).

13. The blade (10) according to claim 12, wherein the blade (10) is formed by at least one of the following methods:

a certain thickness is reserved in the front edge area in the shell layering process of the blade (10), and the front edge component (20) is fixedly installed in the front edge area of the blade (10) after the shell of the blade (10) is clamped;

after the shell of the blade (10) is clamped, polishing the front edge area of the blade (10), and installing and fixing the front edge component (20) on the front edge area of the blade (10);

after the shell of the blade (10) is assembled, the front edge component (20) is directly installed and fixed on the front edge area of the blade (10).

14. An impeller for a wind power plant, comprising a blade (10) according to any of claims 11-13.