CN218177373U

CN218177373U - Wind power blade

Info

Publication number: CN218177373U
Application number: CN202222411486.0U
Authority: CN
Inventors: 祝亮; 贾克斌; 范子超; 朱志成; 包大恩; 范晓旭; 李存义; 王贺; 王博; 朱孟喆; 程蕊; 黄岩
Original assignee: Zhongke Rongzhi International Technology Beijing Co ltd; Zhongneng Power Tech Development Co Ltd
Current assignee: Longyuan Beijing New Energy Engineering Technology Co ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2022-12-30
Anticipated expiration: 2032-09-09

Abstract

The utility model relates to a wind-powered electricity generation blade, this wind-powered electricity generation blade's blade body's surface is formed with the first region that is located the blade trailing edge of blade body and is located the second region of blade leading edge, and the surface of blade body is provided with prevents icing the coating, prevents icing the coating and includes first coating and second coating, and first coating includes a plurality of coating areas, and first region is located to a plurality of coating area intervals, and the second region is located to the second coating. According to the wind power blade, the anti-icing coating is arranged in different modes aiming at different areas on the blade body, so that the icing can be removed in a targeted manner, and the anti-icing effect is good.

Description

Wind power blade

Technical Field

The disclosure relates to the technical field of wind power blade processing, in particular to a wind power blade.

Background

The problem of icing of wind power blades of a wind turbine generator generally exists, and the icing can affect the operation of the wind turbine generator, so that the deviation of a power curve of the wind turbine generator is large. The icing of the wind power blade can also influence the balance of an impeller, possibly cause the failure shutdown of a unit and cause the loss of electric quantity, and in the related technology, a method for deicing by using gas heat, electric heating or a coating exists, wherein the coating icing is a common anti-icing method in the field of wind power generation, and the coating icing is performed by coating an anti-icing coating on the outer surface of the wind power blade. The severity of ice coating formed in different regions of the blade body of the wind power blade is different, and the formed ice coating forms and thicknesses are different, for example, ice coating is easily generated on one side of the blade front edge region of the blade body, the severity of ice coating generated on one side of the blade rear edge region of the blade body is lower than that generated on one side of the blade front edge region, and the ice coating is coated on the surfaces of the different regions of the blade body of the wind power blade in a single arrangement mode for deicing.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a wind-powered electricity generation blade, this wind-powered electricity generation blade is to the region of difference on the blade body, and the coating of preventing icing adopts different modes to arrange, can have corresponding getting rid of icing, and the effect of preventing icing is better.

In order to achieve the above object, the present disclosure provides a wind turbine blade, comprising:

the blade comprises a blade body, wherein a cavity is formed inside the blade body; the outer surface of the blade body is provided with a first area positioned on one side of the blade trailing edge of the blade body and a second area positioned on one side of the blade leading edge of the blade body;

an anti-icing coating comprising a first coating and a second coating, the first coating comprising a plurality of coating bands, the plurality of coating bands being spaced apart in the first region; the second coating is disposed in the second region.

Optionally, the coating band extends along the length direction of the blade body, and a plurality of coating bands are arranged at intervals along the length direction and/or the circumferential direction of the blade body.

Optionally, the blade body is sequentially formed with a root section, a middle section and a tip section along a length direction thereof, and the first region and the second region are both located on an outer surface of the middle section.

Optionally, the ice cover prevention coating further comprises a third coating provided on the outer surface of the tip section.

Optionally, the first coating and the second coating are hydrophobic coatings and the third coating is an anti-icing coating.

Optionally, the wind turbine blade further comprises a gas-heated deicing unit, and the gas-heated deicing unit is arranged in the cavity and used for heating the blade body.

Optionally, a web is arranged in the cavity, and divides the cavity into a first cavity and a second cavity along the length direction of the blade body, the first cavity is communicated with the second cavity at the front end of the cavity, the air inlet end of the air-heated deicing unit is communicated with the rear end of the second cavity, and the air outlet end of the air-heated deicing unit is communicated with the front end of the second cavity.

Optionally, a wind shield and a counterweight bin are arranged in the second cavity, the wind shield divides the second cavity into a first cavity and a second cavity along the length direction of the first cavity, the gas-heated deicing unit is arranged in the first cavity, the counterweight bin is arranged in the second cavity, the counterweight bin, the wind shield, the web and the inner wall of the blade body enclose a gas-heated chamber, the gas-heated chamber corresponds to a second area of the middle section of the blade body, a first through hole is formed in the wind shield, a second through hole is formed in the counterweight bin, and a gas outlet end of the gas-heated deicing unit (10) is communicated with the first through hole.

Optionally, the air-heating deicing unit includes air-blower, heater and air pipe, the air intake of air-blower with the second cavity intercommunication, the air outlet of air-blower with the air inlet end intercommunication of heater, the air-out end of heater passes through air pipe with the first through-hole intercommunication of deep bead.

Optionally, the wind-powered electricity generation blade still includes the support, and is a plurality of support detachably sets up on the web, ventilation pipe detachably sets up on the support.

According to the technical scheme, the first area located on one side of the rear edge of the blade body and the second area located on one side of the front edge of the blade are formed on the outer surface of the blade body, the anti-icing coating is arranged on the outer surface of the blade body and comprises the first coating and the second coating, and the second coating is coated on the second area and can play a role in preventing icing; the first coating comprises a plurality of coating belts, the coating belts are arranged in the first area at intervals, when ice is attached to the coating belt area and the non-coating belt area of the first area at the same time, the ice coating of the coating belt area is looser than the ice coating of the non-coating belt area, the ice coating of the coating belt area is smaller than the ice coating of the non-coating belt area, the stress distribution of a transition layer between the ice coating of the coating belt area and the ice coating of the non-coating belt area is uneven, cracks are easy to generate, the ice coating cannot be stably attached to the outer surface of the blade body, when the blade body vibrates or rotates, the ice coating of the first area is easy to fall off from the surface of the blade body, large-area ice coating is avoided, and the ice coating removing effect is achieved.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:

FIG. 1 is a schematic view of a blade body construction provided in an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic illustration of the placement of an anti-icing coating provided in an exemplary embodiment of the present disclosure;

FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 1;

FIG. 4 is a schematic illustration of a configuration in which a gas-heated deicing unit provided in an exemplary embodiment of the present disclosure is mounted within a blade body.

Description of the reference numerals

1-a root section; 2-a middle section; 201-a second area; 202-a first area; 3-a blade tip section; 4-anti-icing coating; 401 — a second coating; 402-coating a tape; 403-a third coating; 5-the leading edge of the blade; 6-a web; 7-the trailing edge of the blade; 8-a second cavity; 9-a first cavity; 10-gas-heated deicing unit; 101-a blower; 102-a heater; 103-ventilation duct; 104-a scaffold; 11-wind deflector; 12-gas-heated chamber; 13-counterweight cabin.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, directional terms such as "upper, lower, left, and right" are generally used to indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present disclosure and simplifying the description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present disclosure. "inner and outer" refer to the inner and outer contours of the component or structure itself. The terms "first," "second," and the like are used herein to distinguish one element from another, and are not intended to be sequential or important. In the present disclosure, the longitudinal direction of the blade body refers to a direction from the blade root of the blade body to the blade tip of the blade body.

As shown in fig. 1-4, the present disclosure provides a wind turbine blade comprising: the blade comprises a blade body, wherein a cavity is formed inside the blade body; the outer surface of the blade body is provided with a first area 202 positioned on the blade trailing edge 7 side of the blade body and a second area 201 positioned on the blade leading edge 5 side of the blade body; the ice coating prevention coating 4 comprises a first coating layer and a second coating layer 401, wherein the first coating layer comprises a plurality of coating bands 402, and the plurality of coating bands 402 are arranged in the first area 202 at intervals; a second coating 401 is provided in the second region 201.

In the above embodiment, the outer surface of the blade body is formed with the first region 202 located on the blade trailing edge 7 side of the blade body and the second region 201 located on the blade leading edge 5 side of the blade body, the outer surface of the blade body is provided with the ice coating prevention coating 4, the ice coating prevention coating 4 includes the first coating and the second coating 401, and the second coating 401 is coated on the second region 201, which can play a role of preventing ice coating; the first coating comprises a plurality of coating bands 402, the coating bands 402 are arranged at intervals in the first region 202, when ice is attached to the coating bands 402 and the non-coating bands of the first region 202 at the same time, the ice coating of the coating bands 402 is looser than the ice coating of the non-coating bands, the ice coating of the coating bands 402 is smaller than the ice coating of the non-coating bands, the stress distribution of a transition layer between the ice coating of the coating bands 402 and the ice coating of the non-coating bands is uneven, cracks are easy to generate, the ice coating cannot be stably attached to the outer surface of the blade body, when the blade body vibrates or rotates, the ice coating of the first region 202 is easy to fall off from the surface of the blade body, large-area ice coating is avoided, the ice removing effect is achieved, the ice coating preventing effect is better for the side of the leading edge 5 of the blade and the side of the trailing edge 7 of the blade, the ice coating preventing effect is better for the second region 201 on the leading edge 5 side of the blade and the first region 202 on the trailing edge 7 of the blade.

In some specific embodiments, the second coating 401 is coated on the outer surface of the blade body in the whole area of the second area 201, so that the ice coating prevention effect is good. In addition, the first region 202 is located on one side of the blade trailing edge 7, the first region 202 may include all or a part of the blade trailing edge 7, and the first region 202 may also be included in the blade trailing edge 7 region. The second region 201 is located at one side of the leading edge 5 of the blade, the second region 201 may include all or a part of the leading edge 5 of the blade, and the second region 201 may also be included in the leading edge 5 of the blade.

As shown in FIG. 2, in some embodiments, the coated strip 402 extends along the length of the blade body, and a plurality of coated strips 402 are spaced apart along the length and/or circumference of the blade body.

In the above embodiments, the circumferential direction of the blade body is the direction around the central axis of the blade body, and the plurality of coated strips 402 may be provided on the first region 202 of the blade body surface in the longitudinal direction of the blade body, or the plurality of coated strips 402 may be provided on the first region 202 of the blade body surface in the direction around the central axis of the blade.

It should be understood that the shape of the coated strip 402 may be configured in any configuration, such as rectangular, square, triangular, and star. A plurality of coated bands 402 can be provided at any spacing in the first region 202 of the blade body to achieve a better anti-icing effect. And will not be described in detail herein.

As shown in fig. 1, in some embodiments, the blade body is sequentially formed with a root section 1, a middle section 2 and a tip section 3 along the length direction thereof, and the first region 202 and the second region 201 are both located on the outer surface of the middle section 2.

In the above embodiments, the region close to the root of the blade body is a root region, and is divided into a root section 1, a middle section 2, and a tip section 3 in sequence from the root of the blade body to the tip of the blade body, the first region 202 is located at the position of the blade trailing edge 7 of the middle section 2 of the blade body, and the first region 202 includes the blade trailing edge 7 of the middle section 2 of the blade body; the second region 201 is located at the position of the blade leading edge 5 of the middle section 2 of the blade body, the second region 201 contains the blade leading edge 5 of the middle section 2 of the blade body; the first region 202 and the second region 201 together cover the entire area of the blade body middle section 2.

In some embodiments, the central section 2 of the blade body is a section which is relatively easy to freeze out of three sections of the blade body, the first area 202 and the second area 201 are arranged in the central section 2, the first area 202 is arranged on the side of the trailing edge 7 of the blade, the second area 201 is arranged on the side of the leading edge 5 of the blade, the second coating 401 of the ice-proof coating 4 is coated on the second area 201, the first coating comprises a plurality of coating bands 402 which are arranged at intervals on the first area 202, and different areas of the central section 2 can be subjected to targeted ice-proof and ice-removal.

As shown in fig. 3, in some embodiments, ice protection coating 4 further comprises a third coating 403, and third coating 403 is provided on the outer surface of tip section 3. The outer surface of the blade tip section 3 can be protected, so that the ice of the blade tip section 3 is easier to fall off, and the ice coating prevention effect is achieved.

As shown in fig. 2, in some embodiments, the first and second coatings 401 are hydrophobic coatings and the third coating 403 is an anti-ice coating.

In the above embodiments, the hydrophobic coating may be made of polyolefin, polycarbonate, polyamide; the anti-ice coating can be made of anti-ice and snow coating, and the anti-ice and snow coating mainly comprises multiblock inorganic-organic interpenetrating network polymer (IPN) base materials which are arranged alternately and high-activity nano anti-ice and snow additive agent which is subjected to surface modification treatment. Is suitable for various coating methods, can be self-cured at normal temperature, forms a dry coating film with the thickness of 30 mu m on the protected surface, can prevent ice and snow from adhering, and simultaneously has the composite functions of corrosion resistance, wear resistance, aging resistance, surface self-cleaning and the like.

Further, it should be understood that an anti-icing coating 4 may be applied to the root section 1 of the outer surface of the blade body to achieve an anti-icing effect.

As shown in fig. 4, in some embodiments, the wind turbine blade further includes a gas-heated deicing unit 10, and the gas-heated deicing unit 10 is disposed in the cavity for heating the blade body.

In the above embodiment, the gas-heated deicing unit 10 heats the blade body to melt the ice on the portion of the blade body surface close to the blade body surface to form a water layer, the water layer is located between the outer surface of the blade body and the unmelted ice coating layer, the unmelted ice coating layer is in contact with the water layer, the adhesion force is low, and the unmelted ice coating layer falls off from the blade body when the blade body vibrates or rotates, so that the deicing effect is achieved.

In addition, on the basis of the anti-icing coating 4 arranged on the blade body, the air-heated deicing unit 10 arranged in the cavity can further improve the anti-icing and deicing effects, can remove the icing on the outer surface of the blade body more quickly, and has a better anti-icing effect.

In some embodiments, when the wind turbine generator is in operation, the blade body of the wind turbine generator rotates, the ice coating portion of the blade leading edge 5 of the blade body melts into water, during the rotation of the blade body, the water flows from the blade leading edge 5 to the blade trailing edge 7, the water can be rapidly condensed at a lower temperature, a large area of ice coating is formed, a plurality of coating belts 402 are arranged at intervals in the first region 202 on one side of the blade trailing edge 7 of the blade body, when the ice coating is simultaneously attached to the coating belt 402 region and the non-coating belt region of the first region 202, the ice coating in the coating belt 402 region is looser than the ice coating in the non-coating belt region, the ice coating in the coating belt 402 region is also smaller than the ice coating thickness in the non-coating belt region, so that the stress distribution of the transition layer between the ice coating in the coating belt 402 region and the ice coating in the non-coating belt region is uneven, cracks are easily generated, the ice coating layer cannot be stably attached to the outer surface of the blade body, and when the blade body vibrates or rotates, the ice coating layer of the first region 202 is more easily separated from the surface of the blade body, thereby avoiding the long-area of the ice coating.

As shown in fig. 3 and 4, in some embodiments, a web 6 is disposed in the cavity, the web 6 divides the cavity into a first cavity 9 and a second cavity 8 along the length direction of the blade body, the first cavity 9 is communicated with the second cavity 8 at the front end of the cavity, the air inlet end of the air-heated deicing unit 10 is communicated with the rear end of the second cavity 8, and the air outlet end of the air-heated deicing unit 10 is communicated with the front end of the second cavity 8.

In the above embodiment, the air in the second cavity 8 enters the air-heated deicing unit 10 from the air inlet end of the air-heated deicing unit 10, is heated by the air-heated deicing unit 10, is discharged into the first cavity 9 from the air outlet end of the air-heated deicing unit 10, enters the second cavity 8 from the front end of the first cavity 9, and then enters the air-heated deicing unit 10 to form a circulation, so that the air in the cavity is continuously heated in a circulation manner to heat the blade body, thereby melting the ice covering close to the surface of the blade body and achieving the effect of deicing.

Additionally, it should be understood that the forward end refers to a location on the body of the blade near the tip of the blade; the rear end refers to a position on the blade body close to the blade root.

As shown in fig. 4, in some embodiments, a wind shield 11 and a weight cabin 13 are disposed in the first cavity 9, the wind shield 11 divides the first cavity 9 into a first cavity and a second cavity along the length direction of the first cavity 9, the gas-heat deicing unit 10 is disposed in the first cavity, the weight cabin 13 is disposed in the second cavity, the weight cabin 13, the wind shield 11, the web 6 and the inner wall of the blade body enclose a gas-heat chamber 12, the gas-heat chamber 12 corresponds to the second region 201 of the middle section 2 of the blade body, the wind shield 11 is provided with a first through hole, the weight cabin 13 is provided with a second through hole, and the gas outlet end of the gas-heat deicing unit 10 is communicated with the first through hole.

In the above embodiments, the wind deflector 11 may be disposed at the boundary between the root section 1 and the middle section 2, with the first cavity being located at the root section 1 and the second cavity being located at the middle section 2 and the tip section 3.

In some embodiments, the weight cabin 13 may be configured as a solid plate, the weight cabin 13, the wind deflector 11, the web 6 and the inner wall of the blade body enclose a gas-heat chamber 12, the gas-heat chamber 12 is arranged to increase the retention time of the heated air, so that the second region 201 of the middle section 2 of the blade body corresponding to the gas-heat chamber 12 is heated more sufficiently, the second region 201 of the blade body is located on the side of the blade leading edge 5 of the middle section 2 of the blade body, the second region 201 includes the blade leading edge 5 of the middle section 2 of the blade body, the second region 201 is a region on the whole blade body where icing is easier, and by arranging the gas-heat chamber 12, the second region 201 can be heated intensively, so as to melt the ice coating of the second region 201 close to the surface of the blade body more quickly, and then during the rotation of the blade body, the ice coating of the second region 201 slides off, so as to achieve the effect of quickly removing the ice coating.

As shown in fig. 4, in some embodiments, the air-heated deicing unit 10 includes an air blower 101, a heater 102, and a ventilation duct 103, an air inlet of the air blower 101 is communicated with the second cavity 8, an air outlet of the air blower 101 is communicated with an air inlet end of the heater 102, and an air outlet end of the heater 102 is communicated with the first through hole of the wind deflector 11 through the ventilation duct 103.

In the above embodiment, the blower 101 sucks air from the second cavity 8, then inputs the air into the heater 102, the air is heated by the heater 102, the heated air enters the air heating chamber 12 through the ventilation duct 103 and the first through hole of the wind shield 11, the air heating chamber 12 corresponds to the second region 201 of the blade body middle section 2, the temperature of the air in the air heating chamber 12 is high, the generated heat is high, the temperature of the heated outer surface of the blade body of the corresponding second region 201 is high, and the ice coating close to the outer surface of the blade body can be melted quickly.

As shown in fig. 4, in some embodiments, the ventilation duct 103 may be configured as a ventilation hose, the web 6 may be provided with a bracket 104, the plurality of brackets 104 may be detachably provided on the web 6, and the ventilation duct 103 may be detachably provided on the brackets 104, which may facilitate the detachment and maintenance of the ventilation duct 103. The bracket 104 may be fixed to the web 6 by using screws, or may be adhered to the web 6 by using resin.

In some embodiments, the wind turbine further comprises an icing sensor, the icing sensor can be arranged on a cabin or a blade body of the wind turbine, the icing sensor can be arranged in a plurality of numbers, the icing sensor is in signal connection with a control system in the wind turbine, and the icing sensor can detect the icing condition on the blade body.

In the above described embodiments, the gas-heated deicing unit 10 is in signal connection with the control system in the wind turbine. The icing sensor detects the icing condition of the blade body, a slight icing threshold and a severe icing threshold are preset, and when the icing thickness on the blade body is detected to be smaller than or equal to the slight icing threshold, the icing state is slight icing; when the icing thickness of the blade body is detected to be larger than a light icing threshold and smaller than a high icing threshold, the icing state at the moment is medium icing; and when the icing thickness of the blade body is detected to be larger than the heavy icing threshold, the icing state at the moment is heavy icing.

When the icing state is light icing, the gas-heated deicing unit 10 is not started, and the icing-resistant coatings 4 arranged on the middle section 2 and the blade tip section 3 of the surface of the blade body are utilized, in addition, the root section 1 of the blade body can also be provided with the icing-resistant coatings 4, and the icing-resistant coatings 4 arranged on the surface of the blade body can play a role in icing resistance. Of course, the gas-heated deicing unit 10 may be turned on, which may be determined according to actual conditions.

When the icing state is moderate icing or severe icing, the gas-heated deicing unit 10 can be opened, and the gas-heated deicing unit 10 is combined with the anti-icing coating 4, so that a better deicing effect can be achieved.

The present disclosure also provides a method for manufacturing a wind turbine blade, including: a gas-heated deicing unit 10 is arranged in a cavity of the blade body; defining a first region 202 and a second region 201 on the surface of the blade body; preprocessing a first area 202 and a second area 201; a first coating is applied to the first region 202 and a second coating 401 is applied to the second region 201, wherein the first coating comprises a plurality of spaced apart coating bands 402.

In some embodiments, mounting the gas-heated de-icing unit 10 within the cavity of the blade body specifically comprises: the heater 102, the blower 101, the ventilation duct 103 and the bracket 104 are installed at preset positions, wherein the installation of the bracket 104 of the ventilation duct 103 is specifically as follows: preparing glue; the glue is brushed on the web 6; abutting the vent pipe bracket 104 at a preset position of the web 6; the bracket 104 of the ventilation duct 103 is fixed by hand pasting glass fiber cloth.

In some embodiments, prior to the step of installing the gas-heated deicing unit 10 in the cavity of the blade body, the method of manufacturing a wind turbine blade further comprises: at 13 trompils in blade counterweight storehouse and installation deep bead 11 and trompil on deep bead 11, specifically include in 13 trompils in blade counterweight storehouse: arranging a drilling machine at a preset position in the first cavity 9, installing a drill rod and a drill bit, punching at a preset position of the counterweight bin 13, and forming a second through hole; installing wind deflector 11 and opening a hole on wind deflector 11 specifically includes: a first through hole is formed in the wind shield 11; preparing glue; gluing at a preset position in a cavity of the blade body; abutting the wind shield 11 at a preset position; and manually pasting the glass fiber cloth for fixation.

In some embodiments, pre-processing the first region 202 and the second region 201 includes: grinding the outer surfaces of the blade bodies of the first area 202 and the second area 201; the outer surfaces of the blade bodies of the first area 202 and the second area 201 after polishing are cleaned, and chips and oil stains are removed.

In some embodiments, the method for manufacturing a wind turbine blade further includes applying a third coating 403 to the outer surface of the blade body in the tip region.

In addition, the first coating layer, the second coating layer 401, and the third coating layer 403 are all the ice coating preventing coating layer 4.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure as long as it does not depart from the gist of the present disclosure.

Claims

1. A wind blade, comprising:

the blade comprises a blade body, wherein a cavity is formed inside the blade body; a first area located on one side of a blade trailing edge of the blade body and a second area located on one side of a blade leading edge of the blade body are formed on the outer surface of the blade body;

2. The wind blade as set forth in claim 1, wherein the coating band extends along a length direction of the blade body, and a plurality of the coating bands are arranged at intervals along the length direction and/or a circumferential direction of the blade body.

3. The wind turbine blade of claim 1, wherein the blade body is formed with a root section, a middle section, and a tip section along a length direction thereof in sequence, and the first region and the second region are both located on an outer surface of the middle section.

4. The wind blade of claim 3 wherein the anti-icing coating further comprises a third coating disposed on an outer surface of the tip section.

5. The wind blade of claim 4 wherein the first and second coatings are hydrophobic coatings and the third coating is an anti-icing coating.

6. The wind power blade according to any one of claims 1 to 5, further comprising a gas-heated deicing unit disposed in the cavity for heating the blade body.

7. The wind blade as recited in claim 6, wherein a web is disposed in the cavity, the web divides the cavity into a first cavity and a second cavity along a length direction of the blade body, the first cavity is communicated with the second cavity at a front end of the cavity, an air inlet end of the gas-heated deicing unit is communicated with a rear end of the second cavity, and an air outlet end of the gas-heated deicing unit is communicated with a front end of the second cavity.

8. The wind blade according to claim 7, wherein a wind shield and a counterweight chamber are arranged in the first cavity, the wind shield divides the first cavity into a first cavity and a second cavity along the length direction of the first cavity, the gas-thermal deicing unit is arranged in the first cavity, the counterweight chamber is arranged in the second cavity, the counterweight chamber, the wind shield, the web and the inner wall of the blade body enclose a gas-thermal chamber, the gas-thermal chamber corresponds to a second area of the middle section of the blade body, a first through hole is arranged on the wind shield, a second through hole is arranged on the counterweight chamber, and the gas outlet end of the gas-thermal deicing unit is communicated with the first through hole.

9. The wind-powered electricity generation blade of claim 8, wherein, the air-heated deicing unit includes air-blower, heater and air pipe, the air intake of air-blower with the second cavity intercommunication, the air outlet of air-blower with the air inlet end intercommunication of heater, the air-out end of heater pass through air pipe with the first through-hole intercommunication of deep bead.

10. The wind blade of claim 9 further comprising a plurality of brackets removably disposed on the web, wherein the ventilation duct is removably disposed on the brackets.