A heating de-icing unit for a wind turbine blade and a wind turbine blade

Abstract

The application belongs to the technical field of wind power deicing, and particularly relates to a heating deicing unit of a wind power blade and the wind power blade. The heating deicing unit comprises at least two power connection posts and an electric heating layer. The at least two power connection posts are used for connecting positive and negative poles of a power supply respectively. The power connection posts are connected with the wind power blade and are provided with fastening sleeves. The electric heating layer is arranged between the fastening sleeves and the wind power blade, and the electric heating layer is attached to the wind power blade. The electric heating layer is electrically connected with the power connection posts. The power connection posts can be fixed on the wind power blade at a set position during the processing of the wind power blade or after the processing of the wind power blade. The electric heating layer is attached to the surface of the wind power blade to form a first connection structure. The electric heating layer is compressed by the fastening sleeves and the power connection posts to form a second connection structure, so that the electric heating layer is more firmly and reliably connected with the wind power blade and is less likely to be detached. The heating deicing unit with different powers on the blade body can more energy-efficiently deice.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind power deicing, and particularly relates to a heating deicing unit of a wind power blade and the wind power blade. BACKGROUND

[0002] With the development of wind power generation technology, the size of wind power blades is getting larger and larger. Compared with small wind power blades, large wind power blades are more likely to be shut down due to icing in winter, which seriously affects the power generation efficiency and power grid scheduling. Therefore, the market demand for blades with ice melting function is also increasing. At present, the ice melting technical solutions for wind power blades mainly include two kinds: one is to heat the inside of the blade cavity through a hot air device, and the other is to paste an electric heating layer on the blade. The former structure is too complex and has low ice melting efficiency; and the latter usually directly pastes the electric heating layer on the surface of the blade, which is unreliable in long-term use and has a great risk of debonding failure. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved by the application is to provide a heating deicing unit of a wind power blade and the wind power blade, so that the electric heating layer is more firmly and reliably connected with the wind power blade and is less likely to debond.

[0004] The application provides a heating deicing unit of a wind power blade, which comprises:

[0005] At least two power connection posts for connecting positive and negative poles of a power supply respectively, the power connection posts being connected with the wind power blade and provided with fastening sleeves;

[0006] An electric heating layer arranged between the fastening sleeves and the wind power blade and attached to the wind power blade, the electric heating layer having through holes for the power connection posts to pass through, and the electric heating layer being electrically connected with the power connection posts.

[0007] Optionally, the end of the power connection post is provided with a connecting piece connected with the wind power blade.

[0008] Optionally, the connecting piece is embedded in the wind power blade.

[0009] Optionally, the connecting piece is integrally formed with the power connection post.

[0010] Optionally, at least two conductive pieces are sleeved on the power connection post and located on the two sides of the electric heating layer respectively, and the conductive pieces are tightly attached to the electric heating layer through the fastening sleeves.

[0011] And / or, the electric heating layer is one or more compounds of carbon fiber conductor fabric, graphene heating film and metal fiber fabric.

[0012] Optionally, the power connection post is screwed with the fastening sleeve.

[0013] And / or, the power terminal is sleeved with a protective cap.

[0014] Optionally, the fastening sleeve is a hexagonal flange nut.

[0015] And / or, the protective cap is screwed with the power terminal.

[0016] Optionally, a plurality of the electric heating layers are connected in series.

[0017] The application provides a wind power blade, comprising a blade body, a plurality of heating and deicing units arranged along the length direction of the blade body.

[0018] Optionally, the outer surface of the blade body is provided with a metal mesh for a lightning attracting part of a lightning attracting device.

[0019] The application has the beneficial effect that the heating and deicing unit provided by the application can be fixed in the set position of the wind power blade during the processing of the wind power blade or after the processing of the wind power blade, the electric heating layer is attached to the surface of the wind power blade to form a first connection structure, the fastening sleeve is connected with the power terminal to compress the electric heating layer to form a second connection structure, which can make the electric heating layer and the wind power blade more firmly and reliably connected, and less likely to be debonded. The different power heating and deicing units of the blade body can be more energy-saving for deicing. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a cross-sectional structure schematic diagram of the heating and deicing unit of the application.

[0021] Figure 2 It is a structure schematic diagram of the heating and deicing unit of the application arranged in the wind power blade.

[0022] Figure 3 It is a partial structure schematic diagram of the wind power blade of the application.

[0023] In the figure: 100, heating and deicing unit; 110, power terminal; 111, fastening sleeve; 112, connecting piece; 120, electric heating layer; 130, conductive piece; 140, protective cap; 200, blade body. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects of the application more clear and explicit, the application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0025] In the processing of large wind turbine blades, usually divided into several modules are manufactured, and then assembled together to form a complete wind turbine blade. In order to facilitate installation, the heating deicing unit 100 can be installed when manufacturing multiple modules.

[0026] In a first aspect, as shown in Figure 1 and Figure 2 The heating deicing unit 100 of the wind turbine blade provided by the application comprises at least two power supply terminals 110 and an electric heating layer 120; wherein the at least two power supply terminals 110 are used to connect the positive and negative poles of the power supply respectively, the power supply terminals 110 are connected with the wind turbine blade and provided with a fastening sleeve 111; the electric heating layer 120 is arranged between the fastening sleeve 111 and the wind turbine blade, and the electric heating layer 120 is attached to the wind turbine blade, the electric heating layer 120 has a through hole for the power supply terminal 110 to pass through, and the electric heating layer 120 is electrically connected with the power supply terminal 110.

[0027] Compared with the prior art, the heating deicing unit 100 provided by the application can be fixed in the set position of the wind turbine blade during the processing of the wind turbine blade or after the processing of the wind turbine blade, the electric heating layer 120 is attached to the surface of the wind turbine blade to form a first connection structure, and the fastening sleeve 111 is connected with the power supply terminal 110 to compress the electric heating layer 120 to form a second connection structure, so that the electric heating layer 120 can be connected with the wind turbine blade more firmly and reliably, and is less likely to be detached.

[0028] It should be noted that the wind turbine blade is currently composed of reinforcing fibers and epoxy resin, and the power supply terminal 110 is arranged when pouring the epoxy resin or laying the reinforcing fibers in the mold, so that the power supply terminal 110 and the wind turbine blade become a whole, having higher structural strength; the power supply terminal 110 can also be bonded to the wind turbine blade by using epoxy resin.

[0029] In addition, the power supply terminal 110 can be relatively located at any position of the electric heating layer 120, and the installation position of the power supply terminal 110 can avoid the main beam area of the wind turbine blade, solving the problem that the electric heating layer 120 can only draw electrodes from both sides, and breaking through the problem of limited electrode arrangement.

[0030] In an embodiment, the end of the power supply terminal 110 is provided with a connecting piece 112 connected with the wind turbine blade. Specifically, the connecting piece 112 as a part of the power supply terminal 110 can increase the contact surface with the wind turbine blade, and improve the connection strength of the power supply terminal 110 with the wind turbine blade. The connecting piece 112 is integrally formed with the power supply terminal 110 and made of the same material, and the specific material includes but is not limited to pure copper, copper alloy or aluminum material.

[0031] In one embodiment, the connecting piece 112 is embedded in the wind blade, so that the connecting strength of the connecting piece 112 (the power terminal 110) and the wind blade can be enhanced, and the firmness of the electric heating layer 120 can be improved.

[0032] In one embodiment, at least two conductive pieces 130 are sleeved on the power terminal 110 and located on the two sides of the electric heating layer 120 respectively, and the conductive pieces 130 are pressed and adhered to the electric heating layer 120 by the fastening sleeve 111. Specifically, the conductive pieces 130 can increase the current passing capacity of the power terminal 110 and the electric heating layer 120, and the conductive pieces 130 and the electric heating layer 120 can be fully adhered by the fastening sleeve 111, so that the overheat ablation damage caused by the delamination of the conductive pieces 130 and the electric heating layer 120 can be prevented.

[0033] In one embodiment, the conductive piece 130 is made of a continuous sheet structure, which can be made of pure copper, copper alloy, pure aluminum, but is not limited to this. The length of the conductive piece 130 is 0-2000mm, the width is 10-100mm, and the thickness is 0.1-0.5mm. The length of the conductive piece 130 is not less than 50mm, the width and the thickness are allowed to be stacked, the interlayer adhesion strength of the conductive piece 130 and the electric heating layer 120 is ensured, the conductive piece 130 can be processed by opening holes, and the cross section of the opening holes is not limited to circular, square or special-shaped, and more particularly, after the opening holes, the same fabric material as the electric heating layer 120 can be used for perforation and winding treatment.

[0034] In this embodiment, the electric heating layer 120 is one or more compounds of carbon fiber conductor fabric, graphene heating film and metal fiber fabric. The contact area between the electric heating layer 120 and the conductive piece 130 can be coated with low-resistance epoxy conductive adhesive, so that the electric heating layer 120 and the conductive piece 130 are fully contacted and conducted.

[0035] In one embodiment, the power terminal 110 is screwed with the fastening sleeve 111; in some embodiments, the power terminal 110 and the fastening sleeve 111 can also be welded or bonded or clamped.

[0036] In one embodiment, a protective cap 140 is sleeved on the power terminal 110. Specifically, the protective cap 140 can be made of a flexible material with a temperature resistance of not less than 100℃, such as fluororubber, butyl rubber, polyimide, polyether ether ketone, PE, PVC, etc. The main function of the protective cap 140 is to prevent the power terminal 110 from entering glue, to ensure good current conduction, and to also play a certain insulation role.

[0037] In one embodiment, the fastening sleeve 111 is a hexagonal flange nut. Specifically, the flange part of the hexagonal flange nut can increase the contact surface for pressing the conductive piece 130, can improve the adhesion of the conductive piece 130 and the electric heating layer 120, and can also play a role in fixing the electric heating layer 120. Of course, in some embodiments, the fastening sleeve 111 can also be a combination of a nut and a gasket.

[0038] In one embodiment, the protective cap 140 is screwed with the power terminal post 110. In other embodiments, the protective cap 140 is made of fluororubber or butyl rubber, and can also be sleeved on the power terminal post 110 through the elastic shrinkage of the protective cap 140.

[0039] In one embodiment, as shown in FIG. 1, the plurality of electric heating layers 120 in the heating deicing unit 100 are connected in series. Specifically, the first electric heating layer 120 in each heating deicing unit 100 is laid at a distance D1 from the leading edge of the blade body 200, and 10mm≤D1≤20mm; the spacing of each electric heating layer 120 is controlled as D2, and 30mm≤D2≤50mm. Figure 2

[0040] In a second aspect, as shown in FIG. 2, the present application provides a wind power blade, which comprises a blade body 200 and a plurality of heating deicing units 100 arranged along the length direction of the blade body 200. It should be noted that the tip part and the leading edge of the blade body 200 are more likely to be iced, and larger-power heating deicing units 100 can be arranged at these two parts, and the different-power heating deicing units 100 arranged on the blade body 200 can achieve more energy-saving deicing. Figure 3 Specifically, the heating deicing units 100 are arranged in the leading edge position of the windward surface and the leeward surface of the blade body 200, wherein the blade body 200 contains a plurality of heating partitions (heating A, B...X zones) on a single surface, each heating partition contains a plurality of heating deicing units 100, and the power supply between the heating partitions is independent; the heating deicing units 100 can be designed according to the required heating power in the heating partition, and the resistance design of each electric heating layer 120 also has independence.

[0041] The total width of the electric heating layer 120 in the heating A zone is greater than that in the next partition, i.e. LA>LB>...>LX, the interval distance of each heating zone in the spanwise position is L1, and 30mm≤L1≤50mm; the total width L2 of each heating zone should not be less than 20% of the cross-sectional arc length.

[0042] In one embodiment, a metal mesh is arranged on the outer surface of the blade body 200, which is used as a lightning attracting part of a lightning attracting device. Specifically, the metal mesh is made of, but not limited to, a protective metal mesh material such as copper mesh and aluminum mesh, and the lightning attracting part is formed by placing the metal mesh on the outermost layer of the blade structure. The heating deicing unit 100 is located in the next outer layer and is completely wrapped by the metal mesh. Once the blade is struck by lightning, the metal mesh can preferentially attract lightning and release energy, which can effectively protect the heating zone from being damaged by lightning. It should be particularly pointed out that generally, the coverage size of the metal mesh in each direction is greater than the range of the heating zone.

[0043] ​​

[0044] Those skilled in the art will understand that the above discussion of any embodiment is merely exemplary in nature and is not intended to imply that the present application is limited to these examples; the above embodiments or technical features among different embodiments can also be combined, steps can be implemented in any order, and there are many other changes, such as the different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0045] One or more embodiments of the present application are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the present application. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present application should be included in the scope of the present application.

Claims

1. A heating de-icing unit for a wind turbine blade, characterized in that, The application relates to a heating and deicing unit (100) for a wind turbine blade. The heating and deicing unit (100) comprises: at least two power supply terminals (110) for connecting positive and negative poles of a power supply respectively, the power supply terminals (110) being connected to the wind turbine blade and provided with fastening sleeves (111); 2. The heating de-icing unit (100) according to claim 1, characterized in that, an electric heating layer (120) arranged between the fastening sleeves (111) and the wind turbine blade and adhered to the wind turbine blade, the electric heating layer (120) having through holes for the power supply terminals (110) to pass through, and the electric heating layer (120) being electrically connected to the power supply terminals (110).

3. The heating de-icing unit (100) according to claim 2, characterized in that, Ends of the power supply terminals (110) are provided with connecting pieces (112) connected to the wind turbine blade.

4. The heating de-icing unit (100) according to claim 2, characterized in that, The connecting pieces (112) are embedded in the wind turbine blade.

5. The heating de-icing unit (100) according to claim 1, characterized in that, The connecting pieces (112) are integrally formed with the power supply terminals (110).

6. The heating de-icing unit (100) according to any one of claims 1-5, characterized in that, At least two conductive pieces (130) are arranged on the power supply terminals (110) and located on two sides of the electric heating layer (120) respectively, the conductive pieces (130) being tightly adhered to the electric heating layer (120) through the fastening sleeves (111). The power supply terminals (110) are screwed with the fastening sleeves (111).

7. The heating de-icing unit (100) according to claim 6, characterized in that And / or, protective caps (140) are arranged on the power supply terminals (110). The fastening sleeves (111) are hexagonal flange nuts.

8. The heating de-icing unit (100) according to any one of claims 1-5, characterized in that, And / or, the protective caps (140) are screwed with the power supply terminals (110).

9. A wind turbine blade, characterised in that A plurality of the electric heating layers (120) are connected in series.

10. A wind turbine blade according to claim 9, characterised in that The wind turbine blade comprises a blade body (200) and a plurality of the heating and deicing units (100) according to any one of claims 1-8 arranged along the length direction of the blade body (200). An outer surface of the blade body (200) is provided with a metal mesh serving as a lightning attracting part of a lightning attracting device.

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