Wind turbine blade and its manufacturing method

Abstract

The present disclosure relates to a wind turbine blade and a preparation method thereof. On the outer surface of the blade body of the wind turbine blade, a first region located at the trailing edge of the blade body and a second region located at the leading edge of the blade are formed. An anti-icing coating is provided on the outer surface of the blade body. The anti-icing coating includes a first coating and a second coating. The first coating includes a plurality of coating bands, and the plurality of coating bands are arranged at intervals in the first region. The second coating is arranged in the second region. For different regions on the blade body, the anti-icing coating of the wind turbine blade is arranged in different ways, which can remove ice in a targeted manner and has a good anti-icing effect.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind turbine blade processing, and in particular, to a wind turbine blade and a preparation method thereof. Background Art

[0002] Icing commonly occurs on the wind turbine blades of wind turbines. Icing will affect the operation of the unit, resulting in a large deviation in the power curve of the wind turbine. Wind turbine blade icing will also affect the balance of the impeller, which may cause the unit to shut down due to a fault, resulting in a loss of electricity. In the related art, there are methods of using air heating de-icing, electric heating de-icing or coating de-icing. Among them, coating anti-icing is a relatively common anti-icing method in the field of wind power generation. Coating anti-icing is to coat an anti-icing coating on the outer surface of the wind turbine blade for anti-icing. The severity of icing formed in different regions of the blade body of the wind turbine blade is different, and the shape and thickness of the formed ice are also different. For example, icing is more likely to occur on one side of the leading edge region of the blade body, while the severity of icing on one side of the trailing edge region of the blade body is lighter than that on one side of the leading edge region of the blade body. Using a single arrangement method to coat the anti-icing coating on the surfaces of different regions of the blade body of the wind turbine blade for de-icing is not targeted, and the anti-icing effect is not good. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a wind turbine blade and a preparation method thereof. For different regions on the blade body, the anti-icing coating is arranged in different ways, which can remove icing targeted and has a better anti-icing effect.

[0004] To achieve the above purpose, the first aspect of the present disclosure provides a wind turbine blade, including:

[0005] A blade body, with a cavity formed inside the blade body; on the outer surface of the blade body, there is a first region on the trailing edge side of the blade body and a second region on the leading edge side of the blade body;

[0006] An anti-icing coating, including a first coating and a second coating. The first coating includes a plurality of coating bands, and the plurality of coating bands are arranged at intervals in the first region; the second coating is arranged in the second region.

[0007] Optionally, the coating bands extend along the length direction of the blade body, and the plurality of coating bands are arranged at intervals along the length direction and / or the circumferential direction of the blade body.

[0008] Optionally, the blade body sequentially forms a root section, a middle section and a tip section along its length direction, and both the first region and the second region are on the outer surface of the middle section.

[0009] Optionally, the anti-icing coating further includes a third coating disposed on the outer surface of the blade tip section.

[0010] Optionally, the first coating and the second coating are hydrophobic coatings, and the third coating is an anti-icing coating.

[0011] Optionally, the wind turbine blade further includes a pneumatic thermal de-icing unit disposed in the cavity for heating the blade body.

[0012] Optionally, a web is disposed in the cavity, and the web divides the cavity into a first cavity and a second cavity along the length direction of the blade body. The first cavity and the second cavity communicate with each other at the front end of the cavity. The intake end of the pneumatic thermal de-icing unit communicates with the rear end of the second cavity, and the outlet end of the pneumatic thermal de-icing unit communicates with the front end of the second cavity.

[0013] Optionally, a wind deflector and a counterweight chamber are provided in the cavity. The wind deflector divides the second cavity into a first chamber and a second chamber along the length direction of the first cavity. The pneumatic thermal de-icing unit is disposed in the first chamber, and the counterweight chamber is disposed in the second chamber. The counterweight chamber, together with the wind deflector, the web, and the inner wall of the blade body, encloses a pneumatic thermal chamber corresponding to the second region of the middle section of the blade body. A first through hole is provided on the wind deflector, and a second through hole is provided on the counterweight chamber. The outlet end of the pneumatic thermal de-icing unit (10) communicates with the first through hole.

[0014] Optionally, the pneumatic thermal de-icing unit includes a blower, a heater, and a ventilation duct. The intake port of the blower communicates with the second cavity, the outlet port of the blower communicates with the intake end of the heater, and the outlet end of the heater communicates with the first through hole of the wind deflector through the ventilation duct.

[0015] A second aspect of the present disclosure provides a method for manufacturing a wind turbine blade, including:

[0016] Installing a pneumatic thermal de-icing unit in the cavity of the blade body;

[0017] Determining a first region and a second region on the surface of the blade body;

[0018] Performing pretreatment on the first region and the second region;

[0019] Coating a first coating on the first region and a second coating on the second region, wherein the first coating includes a plurality of spaced-apart coating bands.

[0020] Through the above technical solution, a first region located on one side of the trailing edge of the blade body and a second region located on one side of the leading edge of the blade body are formed on the outer surface of the blade body. An anti-icing coating is provided on the outer surface of the blade body. The anti-icing coating includes a first coating and a second coating. Coating the second coating in the second region can play a role in anti-icing. The first coating includes a plurality of coating bands, and the plurality of coating bands are spaced apart in the first region. When ice accretion adheres to both the coated band region and the non-coated band region in the first region simultaneously, the ice accretion in the coated band region is looser than that in the non-coated band region, and the thickness of the ice accretion in the coated band region is also smaller than that in the non-coated band region. As a result, the stress distribution in the transition layer between the ice accretion in the coated band region and the ice accretion in the non-coated band region is uneven, and cracks are more likely to occur, and it cannot stably adhere to the outer surface of the blade body. When the blade body vibrates or rotates, the ice layer in the first region is more likely to fall off from the surface of the blade body, thereby avoiding the formation of large-area ice accretion and achieving the effect of ice removal. For the sides of the leading edge and the trailing edge of the blade with different ice accretion conditions, the anti-icing coating is arranged in the second region located on one side of the leading edge of the blade and the first region located on one side of the trailing edge of the blade respectively, which is more targeted and has a better anti-icing effect.

[0021] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0023] Figure 1 is a schematic structural diagram of a blade body provided in an exemplary embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of the position setting of the anti-icing coating provided in an exemplary embodiment of the present disclosure;

[0025] Figure 3 is Figure 1 the A-A sectional view of

[0026] Figure 4 is a schematic structural diagram of a gas thermal de-icing unit installed in a blade body provided in an exemplary embodiment of the present disclosure.

[0027] DESCRIPTION OF REFERENCE NUMERALS

[0028] 1 - Root section; 2 - Middle section; 201 - Second region; 202 - First region; 3 - Tip section; 4 - Anti - icing coating; 401 - Second coating; 402 - Coating strip; 403 - Third coating; 5 - Leading edge of the blade; 6 - Web; 7 - Trailing edge of the blade; 8 - Second cavity; 9 - First cavity; 10 - Aerothermal de - icing unit; 101 - Blower; 102 - Heater; 103 - Ventilation duct; 104 - Bracket; 11 - Windshield; 12 - Aerothermal chamber; 13 - Counterweight bin. Detailed implementation manners

[0029] The following will describe in detail the detailed implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for explaining and understanding the present disclosure, and are not used to limit the present disclosure.

[0030] In the present disclosure, unless otherwise stated, the orientation words such as "upper, lower, left, right" generally indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present disclosure. "Inner, outer" refer to the inside and outside of the contour of the component or structure itself. "First, second" etc. are used to distinguish one element from another, without sequence and importance. In addition, in the present disclosure, the length direction of the blade body refers to the direction from the root of the blade body to the tip of the blade body.

[0031] As Figures 1 to 4 shown, a first aspect of the present disclosure provides a wind turbine blade, including: a blade body, with a cavity formed inside the blade body; a first region 202 formed on the outer surface of the blade body on one side of the trailing edge 7 of the blade body and a second region 201 formed on one side of the leading edge 5 of the blade body; an anti - icing coating 4, including a first coating and a second coating 401, the first coating including a plurality of coating strips 402, the plurality of coating strips 402 being spaced apart and provided in the first region 202; the second coating 401 being provided in the second region 201.

[0032] In the above-described embodiment, a first region 202 located on one side of the trailing edge 7 of the blade body and a second region 201 located on one side of the leading edge 5 of the blade body are formed on the outer surface of the blade body. An anti-icing coating 4 is provided on the outer surface of the blade body. The anti-icing coating 4 includes a first coating and a second coating 401. Coating the second coating 401 on the second region 201 can play a role in anti-icing. The first coating includes a plurality of coating bands 402, and the plurality of coating bands 402 are spaced apart in the first region 202. When ice accretion adheres to both the coating band 402 region and the non-coating band region in the first region 202 simultaneously, the ice accretion in the coating band 402 region is relatively loose compared to the ice accretion in the non-coating band region, and the thickness of the ice accretion in the coating band 402 region is also smaller than that in the non-coating band region. As a result, the stress distribution in the transition layer between the ice accretion in the coating band 402 region and the ice accretion in the non-coating band region is uneven, and cracks are more likely to occur, and it cannot stably adhere to the outer surface of the blade body. When the blade body vibrates or rotates, the ice layer on the first region 202 is more likely to fall off from the surface of the blade body, thereby avoiding the formation of a large area of ice accretion and achieving the effect of ice removal. For the sides of the leading edge 5 and the trailing edge 7 of the blade with different ice accretion conditions, the anti-icing coating 4 is arranged respectively in the second region 201 located on one side of the leading edge 5 of the blade and the first region 202 located on one side of the trailing edge 7 of the blade, which is more targeted and has a better anti-icing effect.

[0033] In some specific embodiments, the entire outer surface of the blade body in the second region 201 is coated with the second coating 401, and the anti-icing effect is better. In addition, the first region 202 is located on one side of the trailing edge 7 of the blade body. The first region 202 may include all or part of the region of the trailing edge 7, and the first region 202 may also be included in the region of the trailing edge 7. The second region 201 is located on one side of the leading edge 5 of the blade. The second region 201 may include all or part of the region of the leading edge 5, and the second region 201 may also be included in the region of the leading edge 5.

[0034] As Figure 2 shown, in some embodiments, the coating bands 402 extend along the length direction of the blade body, and the plurality of coating bands 402 are spaced apart along the length direction and / or the circumferential direction of the blade body.

[0035] In the above-described embodiment, the circumferential direction of the blade body is the direction around the central axis of the blade body. The plurality of coating bands 402 may be arranged along the length direction of the blade body on the first region 202 on the surface of the blade body, or the plurality of coating bands 402 may be arranged around the central axis of the blade on the first region 202 on the surface of the blade body.

[0036] It should be understood that the shape of the coating strip 402 can be arbitrarily constructed, for example, it can be constructed as a rectangle, a square, a triangle, or a star. A plurality of coating strips 402 can be arranged in the first region 202 of the blade body at any interval to achieve a better anti-icing effect. Details are not described herein.

[0037] As Figure 1 shown, in some embodiments, the blade body is sequentially formed with a root section 1, a middle section 2, and a tip section 3 along its length direction, and both the first region 202 and the second region 201 are located on the outer surface of the middle section 2.

[0038] In the above embodiment, the region near the root of the blade body is the root region. From the root of the blade body to the tip of the blade body, it is sequentially divided into a root section 1, a middle section 2, and a tip section 3. The first region 202 is located at the position of the trailing edge 7 of the middle section 2 of the blade body, and the first region 202 includes the trailing edge 7 of the middle section 2 of the blade body; the second region 201 is located at the position of the leading edge 5 of the middle section 2 of the blade body, and the second region 201 includes the leading edge 5 of the middle section 2 of the blade body; the first region 202 and the second region 201 jointly cover the entire region of the middle section 2 of the blade body.

[0039] In some specific embodiments, the middle section 2 of the blade body is the section that is more likely to ice among the three sections of the blade body. The first region 202 and the second region 201 are arranged in the middle section 2. The first region 202 is located on one side of the trailing edge 7, and the second region 201 is located on one side of the leading edge 5. The second coating 401 of the anti-icing coating 4 is coated on the second region 201, and a plurality of coating strips 402 included in the first coating are arranged at intervals in the first region 202, so as to prevent and remove ice from different regions of the middle section 2 in a targeted manner.

[0040] As Figure 3 shown, in some embodiments, the anti-icing coating 4 further includes a third coating 403, and the third coating 403 is arranged on the outer surface of the tip section 3. It can protect the outer surface of the tip section 3 and make the ice on the tip section 3 easier to fall off to achieve the anti-icing effect.

[0041] As Figure 2 shown, in some embodiments, the first coating and the second coating 401 are hydrophobic coatings, and the third coating 403 is an anti-icing coating.

[0042] In the above-described embodiments, the hydrophobic coating can be made of polyolefin, polycarbonate, or polyamide; the anti-icing coating can be made of an anti-icing and anti-snow coating, which mainly consists of an alternating multi-block inorganic-organic interpenetrating network polymer (IPN) binder and a highly active nano anti-icing and anti-snow additive that has been surface-modified. It is suitable for various coating methods, can be self-cured at room temperature, and forms a dry coating film with a thickness of 30 μm on the protected surface, which can prevent ice and snow from adhering, and at the same time has composite functions such as corrosion resistance, wear resistance, anti-aging, and surface self-cleaning.

[0043] In addition, it should be understood that an anti-icing coating 4 can be applied to the root section 1 of the outer surface of the blade body to achieve the effect of preventing ice formation.

[0044] As Figure 4 shown, in some embodiments, the wind turbine blade further includes a pneumatic thermal de-icing unit 10, which is disposed in the cavity and is used to heat the blade body.

[0045] In the above-described embodiments, when the pneumatic thermal de-icing unit 10 heats the blade body, the ice covering the surface of the blade body can be melted to form a water layer near the part of the ice covering the surface of the blade body. The water layer is located between the outer surface of the blade body and the unmelted ice layer. The unmelted ice layer contacts the water layer, and the adhesion is relatively low. When the blade body vibrates or rotates, the unmelted ice layer falls off from the blade body, achieving the effect of removing ice.

[0046] In addition, based on the anti-icing coating 4 provided on the blade body, the pneumatic thermal de-icing unit 10 disposed in the cavity can further improve the effects of preventing ice formation and removing ice, and can remove the ice on the outer surface of the blade body faster, with a better anti-icing effect.

[0047] In some embodiments, when the wind turbine unit is operating, the blade body of the wind turbine unit rotates, and the ice-covered part of the leading edge 5 of the blade body melts into water. During the rotation of the blade body, the water flows from the leading edge 5 of the blade to the trailing edge 7 of the blade. At a relatively low temperature, the water will quickly condense to form a large area of ice covering. A plurality of coating bands 402 are arranged at intervals in a first region 202 on one side of the trailing edge 7 of the blade body. When the ice covering adheres to both the coating band 402 region and the non-coating band region in the first region 202 at the same time, the ice covering in the coating band 402 region is relatively loose compared to the ice covering in the non-coating band region, and the thickness of the ice covering in the coating band 402 region is also smaller than that in the non-coating band region. As a result, the stress distribution in the transition layer between the ice covering in the coating band 402 region and the ice covering in the non-coating band region is uneven, and cracks are more likely to occur, and it cannot stably adhere to the outer surface of the blade body. When the blade body vibrates or rotates, the ice layer covering the first region 202 is more likely to fall off from the surface of the blade body, thus avoiding the situation of a large area of ice covering existing on the trailing edge 7 of the blade for a long time.

[0048] As Figure 3 and Figure 4 shown, in some embodiments, a web 6 is provided 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 communicates with the second cavity 8 at the front end of the cavity. The air inlet end of the pneumatic thermal de-icing unit 10 communicates with the rear end of the second cavity 8, and the air outlet end of the pneumatic thermal de-icing unit 10 communicates with the front end of the second cavity 8.

[0049] In the above embodiment, the air in the second cavity 8 enters the pneumatic thermal de-icing unit 10 from the air inlet end of the pneumatic thermal de-icing unit 10, and then after being heated by the pneumatic thermal de-icing unit 10, it is discharged into the first cavity 9 from the air outlet end of the pneumatic thermal de-icing unit 10, and then enters the second cavity 8 through the front end of the first cavity 9, and then enters the pneumatic thermal de-icing unit 10 again, forming a cycle, continuously circulating and heating the air in the cavity, heating the blade body, so as to melt the ice covering near the surface of the blade body, achieving the effect of removing the ice covering.

[0050] In addition, it should be understood that the front end refers to the position on the blade body close to the blade tip; the rear end refers to the position on the blade body close to the blade root.

[0051] As Figure 4 shown, in some embodiments, a wind baffle 11 and a counterweight chamber 13 are provided in the first cavity 9. The wind baffle 11 divides the first cavity 9 into a first chamber and a second chamber along the length direction of the first cavity 9. The pneumatic thermal de-icing unit 10 is arranged in the first chamber, and the counterweight chamber 13 is arranged in the second chamber. The counterweight chamber 13, the wind baffle 11, the web 6 and the inner wall of the blade body enclose a pneumatic thermal chamber 12. The pneumatic thermal chamber 12 corresponds to the second region 201 of the middle section 2 of the blade body. A first through hole is provided on the wind baffle 11, and a second through hole is provided on the counterweight chamber 13. The air outlet end of the pneumatic thermal de-icing unit 10 communicates with the first through hole.

[0052] In the above embodiment, the wind baffle 11 can be arranged at the boundary line between the root section 1 and the middle section 2. The first chamber is located in the root section 1, and the second chamber is located in the middle section 2 and the tip section 3.

[0053] In some embodiments, the counterweight chamber 13 can be configured as a solid plate. The counterweight chamber 13, the wind deflector 11, the web 6, and the inner wall of the blade body enclose a pneumatic heating chamber 12. The arrangement of the pneumatic heating chamber 12 can increase the residence time of the heated air, enabling the second region 201 of the middle section 2 of the blade body corresponding to the pneumatic heating chamber 12 to be 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 an area on the entire blade body where icing is more likely to occur. Through the arrangement of the pneumatic heating chamber 12, focused heating can be carried out on the second region 201, melting the ice covering closer to the surface of the blade body in the second region 201 more quickly. Then, during the rotation of the blade body, the ice covering in the second region 201 slides off, achieving the effect of quickly removing ice covering.

[0054] As Figure 4 shown, in some embodiments, the pneumatic de-icing unit 10 includes a blower 101, a heater 102, and a ventilation duct 103. The air inlet of the blower 101 communicates with the second cavity 8, the air outlet of the blower 101 communicates with the air inlet end of the heater 102, and the air outlet end of the heater 102 communicates with the first through-hole of the wind deflector 11 through the ventilation duct 103.

[0055] In the above embodiments, the blower 101 sucks air from the second cavity 8 and then inputs the air into the heater 102. The air is heated by the heater 102, and the heated air enters the pneumatic heating chamber 12 through the ventilation duct 103 and the first through-hole of the wind deflector 11. The pneumatic heating chamber 12 corresponds to the second region 201 of the middle section 2 of the blade body. The air in the pneumatic heating chamber 12 has a higher temperature and generates more heat. Correspondingly, the outer surface temperature of the blade body in the second region 201 that is heated is higher, and the ice covering close to the outer surface of the blade body can be melted more quickly.

[0056] As Figure 4 shown, in some embodiments, the ventilation duct 103 can be configured as a ventilation hose. A bracket 104 can be provided on the web 6. A plurality of brackets 104 are detachably arranged on the web 6, and the hose is detachably arranged on the bracket 104, which facilitates the disassembly and maintenance of the ventilation duct 103. Among them, the bracket 104 can be fixed to the web 6 using screws or pasted to the web 6 using resin.

[0057] In some embodiments, an icing sensor is further included. The icing sensor can be arranged in the nacelle of the wind turbine or on the blade body. A plurality of icing sensors can be provided. The icing sensor is signal-connected to the control system in the wind turbine, and the icing sensor can detect the icing condition on the blade body.

[0058] In the above-described embodiment, the air-heating de-icing unit 10 is signal-connected to the control system in the wind turbine. The icing sensor detects the icing condition of the blade body, and preset light-icing threshold and heavy-icing threshold. When the detected icing thickness on the blade body is less than or equal to the light-icing threshold, the icing state at this time is light icing; when the detected icing thickness on the blade body is greater than the light-icing threshold and less than the heavy-icing threshold, the icing state at this time is moderate icing; when the detected icing thickness on the blade body is greater than the heavy-icing threshold, the icing state at this time is heavy icing.

[0059] When the icing state is light icing, the air-heating de-icing unit 10 may not be turned on. By using the anti-icing coatings 4 provided on the middle section 2 and the tip section 3 of the blade body surface, in addition, the root section 1 of the blade body may also be provided with the anti-icing coating 4. Setting the anti-icing coating 4 on the blade body surface can play a role in preventing icing. Of course, the air-heating de-icing unit 10 may also be turned on, which can be determined according to the actual situation.

[0060] When the icing state is moderate icing or heavy icing, the air-heating de-icing unit 10 may be turned on. The combination of the air-heating de-icing unit 10 and the anti-icing coating 4 can achieve a better de-icing effect.

[0061] The second aspect of the present disclosure provides a method for manufacturing a wind power blade, including: installing the air-heating de-icing unit 10 in the cavity of the blade body; determining a first area 202 and a second area 201 on the surface of the blade body; preprocessing the first area 202 and the second area 201; coating a first coating on the first area 202 and coating a second coating 401 on the second area 201, wherein the first coating includes a plurality of spaced coating strips 402.

[0062] In some embodiments, installing the air-heating de-icing unit 10 in the cavity of the blade body specifically includes: installing a heater 102, a blower 101, a ventilation duct 103, a ventilation duct 103 and a bracket 104 at a preset position. Among them, the installation of the ventilation duct 103 and the bracket 104 is specifically: mixing glue; brushing the glue on the web 6; abutting the ventilation duct bracket 104 against the preset position of the web 6; hand-laying fiberglass cloth to fix the ventilation duct 103 and the bracket 104.

[0063] In some embodiments, before the step of installing the pneumatic thermal de-icing unit 10 in the cavity of the blade body, the method for manufacturing a wind turbine blade further includes: opening holes in the blade counterweight bin 13 and installing a wind deflector 11 and opening holes in the wind deflector 11. Opening holes in the blade counterweight bin 13 specifically includes: arranging a drill in a preset position in the first cavity 9, installing a drill pipe and a drill bit, punching holes at the preset position of the counterweight bin 13 to form a second through hole; installing the wind deflector 11 and opening holes in the wind deflector 11 specifically includes: opening a first through hole in the wind deflector 11; mixing glue; applying the glue at a preset position in the cavity of the blade body; abutting the wind deflector 11 against the preset position; and hand-laying and fixing fiberglass cloth.

[0064] In some embodiments, the pretreatment of the first region 202 and the second region 201 includes: grinding the outer surface of the blade body of the first region 202 and the second region 201; cleaning the outer surface of the blade body of the polished first region 202 and the second region 201 to remove debris and oil.

[0065] In some embodiments, the method for manufacturing a wind turbine blade further includes coating a third coating 403 on the outer surface of the blade body in the tip region.

[0066] In addition, the first coating, the second coating 401, and the third coating 403 are all anti-icing coatings 4.

[0067] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0068] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure does not separately describe various possible combination methods.

[0069] Furthermore, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A wind power blade, characterized in that, The wind power blade includes: a blade body, within which a cavity is formed; on the outer surface of the blade body, a first region is formed on one side of the blade trailing edge of the blade body and a second region is formed on one side of the blade leading edge of the blade body; an anti-icing coating, including a first coating and a second coating, the first coating including a plurality of coating bands, and the plurality of coating bands being spaced and arranged in the first region; the second coating is arranged in the second region; the coating bands extend along the length direction of the blade body, and the plurality of coating bands are spaced and arranged along the length direction and / or the circumferential direction of the blade body; the blade body successively forms a root section, a middle section, and a tip section along its length direction, and both the first region and the second region are on the outer surface of the middle section; the anti-icing coating further includes a third coating, and the third coating is arranged on the outer surface of the tip section; the first coating and the second coating are hydrophobic coatings, and the third coating is an anti-icing coating; the wind power blade further includes a pneumatic heating de-icing unit, which is arranged in the cavity and is used for heating the blade body; a web is arranged in the cavity, and the web divides the cavity into a first cavity and a second cavity along the length direction of the blade body. The first cavity and the second cavity communicate at the front end of the cavity. The air inlet end of the pneumatic heating de-icing unit communicates with the rear end of the second cavity, and the air outlet end of the pneumatic heating de-icing unit communicates with the front end of the second cavity; a wind deflector and a counterweight chamber are arranged in the first cavity. The wind deflector divides the first cavity into a first chamber and a second chamber along the length direction of the first cavity. The pneumatic heating de-icing unit is arranged in the first chamber, and the counterweight chamber is arranged in the second chamber. The counterweight chamber, the wind deflector, the web, and the inner wall of the blade body enclose a pneumatic heating chamber, which corresponds to the second region of the middle section of the blade body. A first through hole is arranged on the wind deflector, a second through hole is arranged on the counterweight chamber, and the air outlet end of the pneumatic heating de-icing unit communicates with the first through hole; 2. The wind power blade according to claim 1, wherein, the pneumatic heating de-icing unit includes a blower, a heater, and a ventilation duct. The air inlet of the blower communicates with the second cavity, the air outlet of the blower communicates with the air inlet end of the heater, and the air outlet end of the heater communicates with the first through hole of the wind deflector through the ventilation duct; 3. A preparation method of a wind power blade, characterized in that, A method for manufacturing the wind power blade according to claim 1 or 2, the method including: installing a pneumatic heating de-icing unit in the cavity of the blade body; determining a first region and a second region on the surface of the blade body; performing pretreatment on the first region and the second region; coating the first coating on the first region and coating the second coating on the second region, wherein the first coating includes a plurality of coating bands arranged at intervals.

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