Off-source intermittent heating fan blade and preparation method

Abstract

The invention relates to the technical field of wind power generation, in particular to an off-source intermittent heating fan blade and a preparation method, the off-source intermittent heating fan blade comprises a fan blade, a wireless induction power generation pile, a guide rail and an induction coil, and the fan blade is sequentially provided with a wireless induction layer and an electric heating function layer from inside to outside. The electric heating film comprises an insulating base body and conductive powder dispersed in the insulating base body, and the insulating layers are arranged on the outer surfaces of the electrodes and the electric heating film respectively; the guide rail is installed on the wireless induction power generation column, and an induction coil is arranged in the guide rail. According to the off-source rest heating fan blade, the induction coil acts on the induction coil through the external wireless power supply transmitting device, and the induction coil is electrically connected with the electric heating function layer through the electrode, so that the electric heating function layer is heated through the wireless power supply electromagnetic induction technology, the problem of icing of the blade is effectively solved, and the load of the fan blade is reduced.

Description

Technical Field

[0001] The invention relates to the field of wind power generation, and in particular to an off-source intermittent heating fan blade and a preparation method thereof. Background Art

[0002] The wind power industry plays an important role in implementing the "carbon peak and carbon neutrality" task and promoting the construction of ecological civilization due to its better environmental performance and good power conversion rate. Wind power generation effectively utilizes my country's wind resources in various places, which is both environmentally friendly and efficient. With the continuous updating of wind power generation technology, it has now occupied an indispensable position in the field of new energy. The vigorous promotion of wind energy utilization can reduce greenhouse gas emissions, reduce environmental pollution, and adjust the energy structure, which is of great significance to the sustainable development of human society.

[0003] While a large number of wind turbines have been invested, they are also facing a series of severe tests. First, in order to maximize the use of wind resources, almost all wind turbines are installed in open high-cold areas and near the coast with strong winds. Due to the particularity of the regional environment, the probability of wind turbine blades encountering icing disasters is higher. Icing increases the load-bearing capacity of wind turbine blades, causing mechanical overload of wind turbine blades, which not only reduces the power generation efficiency of wind turbines, but also makes the power generation efficiency less than 50% when the impact of icing is serious.

[0004] Therefore, in order to solve the above problems caused by blade icing, the present invention discloses an off-source intermittent heating fan blade and a preparation method, which solves the problem by stimulating wireless induction blade heating and ice melting through an off-source induction power generation pile. Summary of the invention

[0005] The main purpose of the present invention is to provide a remote intermittent heating fan blade and a preparation method, aiming to solve the problem of rapid deicing and reducing the load on the fan blade.

[0006] In order to achieve the above-mentioned object, the first aspect of the present invention is to provide an off-source intermittent heating fan blade, comprising: a fan blade, a wireless induction power generation column, a guide rail and an induction coil, wherein the guide rail is mounted on the wireless induction power generation column and an induction coil is arranged inside. The fan blade is provided with a wireless induction layer and an electric heating function layer from the inside to the outside.

[0007] The electrothermal functional layer includes a first insulating layer, a second insulating layer, an electrode and an electrothermal film, wherein the electrode is exposed on the outer surface of the electrothermal film, and the electrothermal film includes an insulating matrix and conductive powder dispersed in the insulating matrix, and the two first insulating layers and the second insulating layer are respectively arranged on the outer surfaces of the electrode and the electrothermal film.

[0008] The electric heating functional layer comprises an insulating layer, an electrode and an electric heating film, wherein the electrode is exposed on the outer surface of the electric heating film, the electric heating film comprises an insulating matrix and conductive powder dispersed in the insulating matrix, and the insulating layer is respectively arranged on the outer surfaces of the electrode and the electric heating film; Furthermore, the particle size of the conductive powder is selected to be in the range of 5 nm to 50 nm.

[0009] Furthermore, the volume ratio of the conductive powder to the insulating matrix is ​​between 1:20 and 1:1. Furthermore, the material of the first insulating layer and the second insulating layer includes any one of polyethylene terephthalate, polyimide, polyurethane, and ethylene vinyl acetate, or a combination of at least two thereof; The material of the insulating layer includes any one of polyethylene terephthalate, polyimide, polyurethane, and ethylene vinyl acetate, or a combination of at least two thereof; The insulation layer plays a vital role in the electric heating functional layer. It not only prevents current leakage, but also protects the electric heating diaphragm and electrodes from environmental erosion. Polyethylene terephthalate (PET), polyimide (PI), polyurethane (PU), ethylene vinyl acetate (EVA) and other materials are selected as the insulation layer due to their excellent insulation properties, chemical stability and mechanical strength. These materials can effectively isolate the electric heating diaphragm from the external environment, ensuring that the current only flows inside the electric heating diaphragm, thereby improving the safety and reliability of the entire system.

[0010] These materials have extremely high resistivity, which can effectively prevent current leakage and ensure the safe operation of the system. They can withstand corrosion from a variety of chemicals, including acids, alkalis, salts, etc., thereby extending the service life of the system. These materials have high mechanical strength and can resist the effects of external mechanical forces, protecting the electric heating diaphragm and electrodes from damage.

[0011] The insulating matrix includes any one of thermoplastic polyurethane, polyethylene oxide, polypropylene, polyethylene, and polyethersulfone, or a combination of at least two thereof.

[0012] The insulating matrix is ​​a key component in the electric heating functional layer. It carries the conductive powder and provides the necessary support for it. Thermoplastic polyurethane (TPU), polyethylene oxide (PEO), polypropylene (PP), polyethylene (PE), polyethersulfone (PES) and other materials are selected as the insulating matrix materials because of their good processing performance, thermal stability and mechanical strength. These materials can form a good dispersion system with the conductive powder to ensure that the electric heating film has uniform conductivity and heat distribution.

[0013] These materials are easy to process and can meet the needs of electric heating membranes of different shapes and sizes. They can maintain stable performance over a wide temperature range, ensuring that the electric heating membrane can work normally in high or low temperature environments. These materials have high mechanical strength and can resist the mechanical stress that the electric heating membrane may be subjected to during use.

[0014] The conductive powder includes any one of nano silver powder, nano aluminum powder, nano iron powder, graphene, conductive carbon black, and carbon nanotubes, or a combination of at least two of them.

[0015] Conductive powder is the core component of the electric heating functional layer, which is responsible for converting electrical energy into thermal energy. Nano silver powder, nano aluminum powder, nano iron powder, graphene, conductive carbon black, carbon nanotubes and other materials are selected as conductive powder materials because of their excellent electrical conductivity and thermal stability. These materials have extremely high electron mobility and thermal conductivity, and can efficiently convert electrical energy into thermal energy in a short time. These materials have extremely low resistivity, which can ensure that the electric heating film has a high efficiency in electrical energy conversion. They can maintain stable performance at high temperatures, ensuring that the electric heating film will not fail in high temperature environments. These materials can form a good dispersion system with the insulating matrix, ensuring that the electric heating film has uniform conductivity and heat distribution.

[0016] Furthermore, the weight percentage of the insulating matrix in the electrothermal functional layer is 5-15, and the weight percentage of the conductive powder is 1-15.

[0017] Furthermore, the thickness of the electrothermal functional layer is 50-200 μm.

[0018] The thickness of the electric heating functional layer and the ratio of the conductive powder to the insulating matrix have an important influence on its performance. Appropriate thickness and ratio can ensure that the electric heating diaphragm has uniform conductivity and heat distribution, thereby improving its heating efficiency and stability. By optimizing the thickness and ratio of the electric heating functional layer, it can be ensured that the electric heating diaphragm has uniform conductivity and heat distribution, thereby improving its heating efficiency and stability. Appropriate thickness and ratio can ensure that the electric heating diaphragm has high efficiency in electric energy conversion and reduce energy waste. Through reasonable ratio and thickness design, it can be ensured that the electric heating functional layer has good mechanical properties, can resist the effects of external mechanical forces, and extend the service life of the system.

[0019] The present invention also provides a method for preparing a fan blade with intermittent heating from a source, comprising: Weigh 5 to 15 parts of organic polymer binder by mass and add them to 80 to 90 parts of organic solvent to dissolve to obtain a polymer solution, weigh 1 to 15 parts of conductive powder and add them to the polymer solution, and stir them thoroughly to obtain a slurry for the electric heating functional layer; The slurry of the electric heating functional layer is placed on the surface of the second insulating layer and cured at high temperature to form an electric heating film; The electrode is arranged on the surface of the electric heating film away from the second insulating layer; Arranging a first insulating layer on the surface of the electric heating film away from the second insulating layer to form an electric heating functional layer; A protective induction coil is arranged on the outer surface of the first insulating layer, and the protective induction coil is electrically connected to the electrode; An external insulating bearing layer is arranged on a side of the protective induction coil facing away from the first insulating layer; The base layer of the fan blade is installed on the outer surface of the insulating bearing layer.

[0020] Furthermore, the organic solvent includes any one of N-methylpyrrolidone, N,N-dimethylformamide or N,N-dimethylacetamide, or a combination of at least two thereof.

[0021] Compared with the prior art, the method for preparing a fan blade with intermittent heating from a source has the following beneficial effects: 1. A heating layer is introduced into the wind turbine blades. The induction coil is acted on by a wireless induction excitation device matched with the wind turbine, and the electrode electrically connects the induction coil with the electrothermal functional layer, that is, the wireless power supply electromagnetic induction technology makes the electrothermal functional layer heat up; 2. The wireless induction heating fan blades of the present invention have wireless charging heating sensing function, and utilize wireless charging electromagnetic induction technology to effectively solve the deicing problem and reduce the load on the fan blades; 3. The wireless induction heating fan blades of the present invention can be well fitted with the flexible electric heating functional film, which greatly reduces the impact on the aerodynamic characteristics of the fan operation, improves the utilization rate of wind energy, and increases the economic benefits of wind power generation; 4. The off-source power generation pile and wind turbine blades form a supporting facility, reducing the load of the wind turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the wireless induction wind power generation pile and supporting facilities of the present invention; Figure 2 It is a schematic diagram of the structure of the wireless induction heating fan blade of the present invention; Figure 3 It is the electric heating curve of the wireless induction heating fan blade in Example 1 of the present invention.

[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] like Figure 1 and Figure 2As shown, the present invention provides the present invention relates to the field of wind power generation, specifically a kind of intermittent heating of wind turbine blades from a source, including a wind turbine blade 100, a wireless induction power generation pile 200, a guide rail 300 and an induction coil 400, wherein the wind turbine blade is provided with a wireless induction layer and an electrothermal functional layer from the inside to the outside. The wireless induction layer 500 includes an insulating bearing layer 510 and a protective induction coil 520, wherein the insulating bearing layer combines the induction coil with the electrothermal functional layer 600; the protective induction coil 520 is arranged on the outer surface of the electrothermal functional layer 600 and is electrically connected to the electrode. The electrothermal functional layer 600 includes a first insulating layer 610, a second insulating layer 640, an electrode 620 and an electrothermal film 630, wherein the electrode 620 is exposed on the outer surface of the electrothermal film, and the electrothermal film includes an insulating matrix and conductive powder dispersed in the insulating matrix. The first insulating layer 610 and the second insulating layer 640 are respectively arranged on the outer surfaces of the electrode and the electrothermal film; the guide rail is installed on the wireless induction power generation column, and an induction coil is arranged inside.

[0025] The off-source intermittent heating of the fan blades of the present invention is achieved by acting on the induction coil through an external wireless power transmission device, and the electrode electrically connects the induction coil with the electrothermal functional layer, that is, the wireless power supply electromagnetic induction technology makes the electrothermal functional layer generate heat, effectively solving the problem of blade icing and reducing the load on the fan blades; and the fan blades and the flexible electrothermal functional film can fit well, greatly reducing the impact on the aerodynamic characteristics of the fan operation, improving the utilization rate of wind energy, and increasing the economic benefits of wind power generation; the off-source power generation pile and the fan blades form a supporting facility, which reduces the load of the wind turbine generator set.

[0026] The off-source intermittent heating of the fan blades of the present invention is based on the principle of wireless power supply electromagnetic induction technology: the technology uses an external wireless power supply transmitter to generate a changing magnetic field, which acts on the induction coil 400 installed on the fan blade (and the induction coil inside the guide rail 300, if they also participate in the power receiving process). The conductor in the induction coil 400 will generate an induced current in the changing magnetic field, which is the phenomenon described by Faraday's law of electromagnetic induction.

[0027] The induced current is then electrically connected to the electric heating functional layer 600 through the electrode 620. The electric heating functional layer 600 includes an electric heating film 630, which is composed of an insulating matrix and conductive powder dispersed therein. When the induced current flows through the electric heating film, due to the resistance of the conductive powder, the electrical energy is converted into thermal energy, thereby causing the electric heating functional layer 600 to generate heat.

[0028] The insulating bearing layer 510 is used to support and protect the induction coil 520 to ensure that it can work stably in a harsh wind power generation environment. At the same time, the first insulating layers 610 and 640 are respectively arranged on the outer surfaces of the electrode 620 and the electric heating film 630 to prevent current leakage and short circuit, thereby ensuring the safe operation of the entire system.

[0029] Furthermore, through wireless power supply electromagnetic induction technology, the electrothermal functional layer can be quickly heated to melt the ice layer on the blades, reduce the load on the wind turbine blades, and improve the operating efficiency and safety of the wind turbine. Effectively solve the problem of blade icing; the electrothermal functional film can fit well with the wind turbine blades and will not significantly change the aerodynamic shape of the blades, thereby reducing the impact on the aerodynamic characteristics of the wind turbine and improving the utilization rate of wind energy. Reduce the impact on the aerodynamic characteristics of the wind turbine; by reducing blade icing and reducing the load of the wind turbine generator set, the wind turbine blades of the present invention can extend the service life of the wind turbine, reduce maintenance costs, and improve the economic benefits of wind power generation. The off-source power generation pile 200 and the wind turbine blades 100 form a complete supporting facility, without the need for additional power cord connection, reducing the complexity of installation and maintenance, and also reducing dependence on traditional power grids.

[0030] The present invention also provides a method for preparing a fan blade with intermittent heating from a source, comprising: Weigh 5 to 15 parts of organic polymer binder by mass and add them to 80 to 90 parts of organic solvent to dissolve to obtain a polymer solution, weigh 1 to 15 parts of conductive powder and add them to the polymer solution, and stir them thoroughly to obtain a slurry of the electric heating functional layer 600; The slurry of the electric heating functional layer 600 is disposed on the surface of the second insulating layer 640 and cured at high temperature to form the electric heating film 630; The electrode 620 is disposed on the surface of the electric heating film 630 away from the second insulating layer 640; A first insulating layer 610 is disposed on the surface of the electric heating film 630 away from the second insulating layer 640 to form an electric heating functional layer 600; A protection induction coil 520 is disposed on the outer surface of the first insulating layer 610 , and the protection induction coil 520 is electrically connected to the electrode 620 ; An external insulating bearing layer 510 is provided on a side of the protective induction coil 520 facing away from the first insulating layer 610; The wind turbine blade base layer 100 is mounted on the outer surface of the insulating bearing layer 510 .

[0031] Principle analysis: Preparation process of electrothermal functional layer slurry: First, the organic polymer binder is dissolved in an organic solvent to form a polymer solution. Then, the conductive powder is added to the polymer solution and stirred thoroughly. The purpose of this step is to prepare the slurry of the electrothermal functional layer 600, in which the conductive powder will be dispersed in the polymer matrix as an electrothermal element.

[0032] The slurry of the electric heating functional layer is coated on the surface of the second insulating layer 640, and the solvent in the polymer solution is volatilized through a high temperature curing process to form a cured electric heating film 630. This step ensures that the electric heating film has good conductivity and mechanical strength. An electrode 620 is set on the surface of the electric heating film 630 away from the second insulating layer 640. The electrode serves as an interface between the electric heating film and the external circuit, and is responsible for transferring the induced current to the electric heating film, thereby generating heat. The first insulating layers 610 and 640 are respectively set on the outer surfaces of the electric heating film 630 and the electrode 620 (if 640 is not used as a substrate in the previous step). These insulating layers are used to prevent current leakage and short circuit to ensure the safe operation of the entire system. A protective induction coil 520 is set on the outer surface of the first insulating layer 610, and the protective induction coil 520 is electrically connected to the electrode 620. The induction coil is responsible for receiving the external wireless power supply signal and converting it into electrical energy and transmitting it to the electric heating film. An external insulating bearing layer 510 is set on the side of the protective induction coil 520 away from the first insulating layer 610. The insulating bearing layer is used to support and protect the induction coil to prevent it from being mechanically damaged or corroded by the environment. Finally, the outer surface of the insulating bearing layer 510 is mounted on the fan blade base layer 100 to complete the assembly of the entire fan blade.

[0033] As an example, the preparation method of the present invention is relatively simple, does not require complex equipment and process steps, and is suitable for large-scale production. The materials used (such as organic polymer binders, conductive powders, insulating layer materials, etc.) are relatively low in cost, which is conducive to reducing the manufacturing cost of the entire fan blade. Through the carefully designed electrothermal functional layer slurry and preparation process, the electrothermal diaphragm is ensured to have good conductivity and thermal stability, thereby ensuring the stable operation of the fan blade in harsh environments. The entire heating system is cleverly integrated into the internal structure of the fan blade and will not significantly change the aerodynamic shape of the blade, thereby reducing the impact on the aerodynamic characteristics of the fan operation. Since the heating system works by wireless power supply, no additional power cord connection is required, which makes the maintenance and replacement of the entire system more convenient and quick.

[0034] The preparation method of the off-source intermittent heating fan blades of the present invention has the advantages of simple process, low material cost, stable electrothermal performance, compact structure, and easy maintenance and replacement, and provides a new and efficient heating solution for the field of wind power generation.

[0035] The technical solution of the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0036] Example 1 A method for intermittently heating fan blades from a remote source, wherein the specific material composition and steps are as follows: (1) Dissolve 5 parts by weight of thermoplastic polyurethane particles (insulating matrix raw material) in 80 parts by weight of N-methylpyrrolidone solution and mechanically stir at 60°C to form a TPU-NMP solution; (2) Add 15 parts by weight of conductive carbon black to the TPU-NMP solution prepared in step 1, and mix the conductive carbon black and the TPU-NMP solution evenly by mechanical stirring to form a slurry of the electric heating film 630; (3) The slurry of the electric heating film 630 prepared in step (2) is uniformly coated on the surface of the polyimide film (the second insulating layer 640), and dried at 60° C. for 8 h, and then cured at high temperature to form the electric heating film 630; (4) placing the copper electrode (electrode 620) on the surface of the electric heating film 630 in step (3), and sealing a layer of polyimide film (first insulating layer 610) on the surface of the electric heating film to form an electric heating functional layer 600; (5) A protective induction coil 520 is arranged on one side of the electrothermal functional layer 600 prepared in step (4), and the induction coil is connected to the copper electrode in step (4). An insulating bearing layer 510 is arranged on the outer surface of the protective induction coil 520, and the thickness of the insulating bearing layer 510 is 40 μm, thereby obtaining a wireless induction heating fan blade.

[0037] Reference Figure 2 , is the electric heating curve of the wireless induction heating fan blade in this embodiment. In an environment of normal temperature and pressure, and relative humidity not exceeding 50%, the experimental conditions are: the wireless power supply transmitter is connected to a DC power supply with a rated voltage of 10V, and the distance between the wireless power supply transmitter and the wireless induction heating fan blade is 5-20 cm.

[0038] The intermittent heating fan blade obtained in this embodiment can quickly reach a constant temperature state within 50 seconds when a voltage of 12 V is applied, and the constant temperature can reach 60°C.

[0039] Example 2 A method for intermittently heating fan blades from a remote source, wherein the specific material composition and steps are as follows: (1) Dissolve 10 parts by weight of polyethylene oxide particles (insulating matrix raw material) in 80 parts by weight of N,N-dimethylformamide solution and stir mechanically at 70°C to form a PEO-DMF solution; (2) adding 10 parts by weight of nano silver powder to the PEO-DMF solution prepared in step (1), and mixing the nano silver powder and the PEO-DMF solution uniformly by mechanical stirring to form a slurry for the electric heating film 630; (3) The slurry of the electric heating film 630 prepared in step (2) is uniformly coated on the surface of the polyimide film (the second insulating layer 640), and dried at 70°C for 10 hours, and then cured at high temperature to form the electric heating film 630; (4) placing the copper electrode (electrode 620) on the surface of the electric heating film 630 in step (3), and sealing a layer of polyimide film (first insulating layer 610) on the surface of the electric heating film to form an electric heating functional layer 600; (5) A protective induction coil 520 is arranged on one side of the electrothermal functional layer 600 prepared in step (4), and the induction coil is connected to the copper electrode in step (4). An insulating bearing layer 510 is arranged on the outer surface of the protective induction coil 520, and the thickness of the insulating bearing layer 510 is 60 μm, thereby obtaining a wireless induction heating fan blade.

[0040] The fan blades intermittently heated from the source obtained in this embodiment can quickly reach a constant temperature state within 50 seconds when a voltage of 15 V is applied, and the constant temperature can reach 90°C.

[0041] Example 3 A remote source intermittent heating fan blade, the specific material composition and steps during implementation are: (1) 13 parts by weight of polypropylene particles (insulating matrix raw material) were dissolved in 85 parts by weight of N,N-dimethylacetamide solution, and mechanically stirred at 80°C to form a PP-DMAC solution; (2) adding 13 parts by weight of nano iron powder and nano aluminum powder to the PP-DMAC solution prepared in step (1), and uniformly mixing the nano iron powder and nano aluminum powder with the PP-DMAC solution by mechanical stirring to form a slurry of the electric heating diaphragm (630); (3) The slurry of the electric heating film 630 prepared in step (2) is uniformly coated on the polyimide film (the second insulating layer 640), and dried at 65° C. for 12 h, and then cured at high temperature to form the electric heating film 630; (4) placing the copper electrode (electrode 620) on the surface of the electric heating film 630 in step (3), and sealing a layer of polyimide film (first insulating layer 610) on the surface of the electric heating film to form an electric heating functional layer 600; (5) A protective induction coil 520 is arranged on one side of the electrothermal functional layer 600 prepared in step (4), the induction coil is connected to the copper electrode of step (4), and an insulating bearing layer 510 is arranged on the outer surface of the protective induction coil (520), the packaging thickness of the insulating bearing layer 510 is 50 μm, and thus a wireless induction heating fan blade is obtained.

[0042] The intermittent heating fan blade obtained in this embodiment can quickly reach a constant temperature state within 100 seconds when a voltage of 14 V is applied, and the constant temperature can reach 67°C.

[0043] Example 4 A remote source intermittent heating fan blade, the specific material composition and steps during implementation are: (1) Dissolve 7 parts by weight of polyethylene particles (insulating matrix raw material) in 90 parts by weight of NN dimethyl pyrrolidone solution and mechanically stir at 85°C to form a PE-NMP solution; (2) adding 3 parts by weight of conductive carbon black and carbon nanotubes to the PE-NMP solution prepared in step (1), and uniformly mixing the conductive carbon black and carbon nanotubes with the PE-NMP solution by mechanical stirring to form a slurry of the electric heating film 630; (3) The slurry of the electric heating film 630 prepared in step (2) is uniformly coated on the surface of the polyimide film (the second insulating layer 640), and dried at 65° C. for 12 h, and then cured at high temperature to form the electric heating film 630; (4) placing the copper electrode (electrode 620) on the surface of the electric heating film 630 in step (3), and sealing a layer of polyimide film (first insulating layer 610) on the surface of the electric heating film to form an electric heating functional layer 600; (5) A protective induction coil 520 is arranged on the other side of the electrothermal functional layer 600 prepared in step (4), and the induction coil is connected to the copper electrode in step (4). An insulating bearing layer 510 is arranged on the outer surface of the protective induction coil 520, and the packaging thickness of the insulating bearing layer 510 is 65 μm, so that an insulating bearing layer 510 is obtained.

[0044] The fan blades intermittently heated from the source obtained in this embodiment can quickly reach a constant temperature state within 50 seconds when a voltage of 15 V is applied, and the constant temperature can reach 70°C.

[0045] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A fan blade intermittently heated from a source, characterized in that: include: A wind turbine blade (100), a wireless induction power generation column (200), a guide rail (300) and an induction coil (400), wherein the guide rail (300) is mounted on the wireless induction power generation column (200), and the induction coil (400) is arranged inside the guide rail (300); and the wind turbine blade (100) is provided with a wireless induction layer (500) and an electric heating function layer (600) in sequence from the inside to the outside.

2. The intermittent heating fan blade from a separate source according to claim 1, characterized in that: The electrothermal functional layer (600) comprises a first insulating layer (610), a second insulating layer (640), an electrode (620) and an electrothermal film (630), wherein the electrode (620) is exposed on the outer surface of the electrothermal film (630), the electrothermal film (630) comprises an insulating matrix and conductive powder dispersed in the insulating matrix, and the two first insulating layers (610) and the second insulating layer (640) are respectively arranged on the outer surfaces of the electrode (620) and the electrothermal film (630).

3. The intermittent heating fan blade from a separate source according to claim 2, characterized in that: The wireless induction layer (500) comprises an insulating bearing layer (510) and a protective induction coil (520); the insulating bearing layer (510) combines the protective induction coil (520) with the electrothermal functional layer (600); the protective induction coil (520) is arranged on the outer surface of the electrothermal functional layer (600) and is electrically connected to the electrode (620).

4. The intermittent heating fan blade from a separate source according to claim 3, characterized in that: The material of the insulating bearing layer (510) includes any one of polyethylene terephthalate, polyimide, polyurethane, and ethylene vinyl acetate, or a combination of at least two thereof; The material of the first insulating layer (610) and the second insulating layer (640) includes any one of polyethylene terephthalate, polyimide, polyurethane, and ethylene vinyl acetate, or a combination of at least two thereof; The insulating matrix includes any one of thermoplastic polyurethane, polyethylene oxide, polypropylene, polyethylene, and polyethersulfone, or a combination of at least two thereof.

5. The intermittent heating fan blade from a separate source according to claim 2, characterized in that: The conductive powder includes any one of nano silver powder, nano aluminum powder, nano iron powder, graphene, conductive carbon black, and carbon nanotubes, or a combination of at least two of them.

6. The intermittent heating fan blade from a separate source according to claim 2, characterized in that: The weight percentage of the insulating matrix in the electrothermal functional layer (600) is 5 to 15, and the weight percentage of the conductive powder is 1 to 15; the thickness of the electrothermal functional layer (600) is 50 to 200 μm.

7. The intermittent heating fan blade from a separate source according to claim 2, characterized in that: The particle size of the conductive powder is selected in the range of 5 nm to 20 nm.

8. The intermittent heating fan blade from a separate source according to claim 2, characterized in that: The volume ratio of the conductive powder to the insulating matrix is ​​between 1:20 and 1:

1.

9. A method for preparing a fan blade with intermittent heating from a source, characterized in that: include: Weighing 5 to 15 parts of an organic polymer binder by weight and adding them to 80 to 90 parts of an organic solvent to dissolve to obtain a polymer solution, weighing 1 to 15 parts of a conductive powder and adding them to the polymer solution, and stirring them thoroughly to obtain a slurry of an electric heating functional layer (600); The slurry of the electric heating functional layer (600) is arranged on the surface of the second insulating layer (640) and cured at high temperature to form an electric heating film (630); The electrode (620) is arranged on a surface of the electric heating film (630) facing away from the second insulating layer (640); A first insulating layer (610) is provided on a surface of the electric heating film (630) facing away from the second insulating layer (640) to form an electric heating functional layer (600); A protective induction coil (520) is arranged on the outer surface of the first insulating layer (610), and the protective induction coil (520) is electrically connected to the electrode (620); An external insulating bearing layer (510) is provided on a side of the protective induction coil (520) facing away from the first insulating layer (610); The fan blade base layer (100) is installed on the outer surface of the insulating bearing layer (510).

10. The method for preparing a fan blade with intermittent heating from a source according to claim 9, characterized in that: The organic solvent includes any one of N-methylpyrrolidone, N,N-dimethylformamide or N,N-dimethylacetamide, or a combination of at least two thereof.

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