Lightweight wind power blade structure

Abstract

The utility model discloses a light-weight wind power blade structure which comprises a main beam, a front edge structure and a rear edge structure. The trailing edge structure comprises a transverse rib plate and a trailing edge beam; the transverse rib plate is connected between the main beam and the rear edge beam, and a light-weight strengthening film is laid on the outer surface of the transverse rib plate. The front edge structure is connected with the end, away from the rear edge structure, of the main beam. According to the wind power blade trailing edge structure, the non-solid transverse rib plate is used for replacing a solid composite sandwich plate in an existing wind power blade trailing edge structure (the transverse rib plate and the composite sandwich plate are made of the same material), the weight of a wind power blade can be reduced (the maximum weight reduction amplitude reaches more than 20%), and under the action of the rib structure and the light reinforcing film, the weight of the wind power blade can be reduced. And the rigidity of the wind power blade can be ensured, so that the required aerodynamic configuration of the wind power blade can be kept when the wind power blade rotates.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation equipment, in particular to a lightweight wind power blade structure. Background Art

[0002] As wind turbine blades become larger and larger, their weight becomes heavier, which makes them inconvenient to install and transport. Therefore, it is necessary to make the wind turbine blades lighter. However, if the wind turbine blades are too lightweight, it will not only affect the overall stiffness of the wind turbine blades, but also fail to ensure that the wind turbine blades can maintain their required aerodynamic shape when rotating, and will also affect the weather resistance of the wind turbine blades.

[0003] Therefore, how to lighten the wind turbine blades while ensuring the overall stiffness of the wind turbine blades so that the wind turbine blades can maintain their required aerodynamic shape when rotating and without reducing the weather resistance of the wind turbine blades needs to be solved urgently. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a lightweight wind turbine blade structure.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is as follows:

[0006] A lightweight wind turbine blade structure, comprising a main beam, a leading edge structure, and a trailing edge structure;

[0007] The trailing edge structure includes transverse ribs and trailing edge beams;

[0008] The transverse ribs are connected between the main beam and the trailing edge beam, and the outer surface of the transverse ribs is paved with a lightweight strengthening membrane;

[0009] The leading edge structure is connected to an end of the main beam away from the trailing edge structure.

[0010] In this technical solution, the solid composite sandwich panels in the existing wind turbine blade trailing edge structure are replaced by non-solid transverse ribs (the transverse ribs and the composite sandwich panels are made of the same material). This not only reduces the weight of the wind turbine blade, but also ensures the stiffness of the wind turbine blade under the action of the rib structure and the lightweight reinforcement membrane, so that the wind turbine blade can maintain its required aerodynamic shape when rotating.

[0011] Furthermore, each rib of the transverse ribs is hollow, which can further reduce the weight of the wind turbine blade.

[0012] Furthermore, one end of the transverse rib connected to the main beam is provided with a mounting groove to facilitate the alignment of the transverse rib and the main beam.

[0013] Furthermore, the lightweight reinforcement membrane includes a base fabric layer, a protective coating layer, and an auxiliary layer;

[0014] The base fabric layer is provided between the protective coating layers;

[0015] The auxiliary layer is arranged on the periphery of the corresponding protective coating layer, sandwiching the base fabric layer and the protective coating layer;

[0016] The lightweight strengthening membrane is adhered to the outer surface of the transverse rib through the auxiliary layer at the bottom.

[0017] Furthermore, the base fabric layer is a fiber base fabric layer, which mainly plays the role of maintaining the stability of the lightweight reinforced membrane structure.

[0018] Furthermore, the protective coating is a PVC (polyvinyl chloride) protective coating, a PTFE (polytetrafluoroethylene) protective coating, a PVF (polyvinyl fluoride) protective coating, a PVDF (polyvinylidene fluoride) protective coating or an ETFE (ethylene-tetrafluoroethylene copolymer) protective coating, which has the protective effects of resistance to UV aging, wear resistance, rain erosion resistance, high and low temperature impact resistance, acid and alkali resistance, moisture and heat aging resistance, flame retardancy and self-cleaning.

[0019] Furthermore, both ends of the lightweight strengthening membrane are connected to the corresponding main beam and trailing edge beam respectively through epoxy structural adhesive, thereby being fixed to the outer surface of the transverse rib.

[0020] Furthermore, both ends of the lightweight strengthening membrane are connected to the corresponding main beam and trailing edge beam respectively through non-metallic bolts, thereby being fixed to the outer surface of the transverse rib.

[0021] Furthermore, webs are provided between the main beams to improve the overall stiffness of the wind turbine blades.

[0022] Furthermore, the web is fitted with one end of the transverse rib.

[0023] Compared with the existing technology, the principles and advantages of this technical solution are as follows:

[0024] 1. Replacing the solid composite sandwich panels in the existing wind turbine blade trailing edge structure with non-solid transverse ribs (the transverse ribs and the composite sandwich panels are made of the same material) can not only reduce the weight of the wind turbine blade (the maximum weight reduction is more than 20%), but also ensure the stiffness of the wind turbine blade under the action of the rib structure and lightweight reinforcement membrane, so that the wind turbine blade can maintain its required aerodynamic shape when rotating.

[0025] 2. The lightweight reinforced membrane includes a base fabric layer, a protective coating, and an auxiliary layer; the base fabric layer is arranged between the protective coatings, and plays a role in maintaining the stability of the lightweight reinforced membrane structure; the protective coating has protective functions such as resistance to UV aging, wear resistance, rain erosion resistance, high and low temperature impact resistance, acid and alkali resistance, resistance to wet and hot aging, flame retardancy and self-cleaning; the auxiliary layer is arranged on the periphery of the corresponding protective coating, sandwiching the base fabric layer and the protective coating in the middle, and is used to improve the bonding performance of the lightweight reinforced membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the services required in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a cross-sectional schematic diagram of a lightweight wind turbine blade structure according to a first embodiment of the present utility model;

[0028] Figure 2 This is a three-dimensional diagram of a lightweight wind turbine blade structure after omitting the lightweight reinforcement film in the first embodiment of the present utility model;

[0029] Figure 3 This is a schematic diagram of a lightweight reinforcement membrane in a lightweight wind turbine blade structure according to a first embodiment of the present utility model;

[0030] Figure 4 This is a schematic diagram of a lightweight strengthening membrane in a lightweight wind turbine blade structure connected to a corresponding main beam via epoxy structural adhesive in a first embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of a lightweight strengthening membrane in a lightweight wind turbine blade structure connected to a corresponding main beam through non-metallic bolts in a second embodiment of the present utility model.

[0032] Reference numerals:

[0033] 1- Main beam; 2- Transverse ribs; 3- Trailing edge beam; 4- Leading edge beam; 5- Composite sandwich panel; 6- Lightweight reinforcement membrane; 7- Mounting groove; 8- Base fabric layer; 9- Protective coating; 10- Auxiliary layer; 11- Epoxy structural adhesive; 12- Non-metallic bolts; 13- Web plate. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to two specific embodiments:

[0035] Example 1

[0036] like Figures 1 to 4 As shown, the lightweight wind turbine blade structure described in this embodiment includes a main beam 1, a leading edge structure and a trailing edge structure.

[0037] The leading edge structure includes a leading edge beam 4 and a composite sandwich panel 5 ; the trailing edge structure includes a transverse rib 2 and a trailing edge beam 3 .

[0038] Both ends of the leading edge beam 4 are connected to the corresponding main beam 1 through corresponding composite sandwich panels 5 .

[0039] The transverse ribs 2 are connected between the main beam 1 and the trailing edge beam 3 , and a lightweight strengthening membrane 6 is laid on the outer surface of the transverse ribs 2 .

[0040] A web 13 is provided between the main beams 1 , and the web 13 is in contact with one end of the transverse rib 2 to improve the overall stiffness of the wind turbine blade.

[0041] Specifically, in this embodiment, each rib of the transverse rib is hollow, which can further reduce the weight of the wind turbine blade. In addition, the end of the transverse rib connected to the main beam is provided with a mounting groove 7 to facilitate the alignment of the transverse rib and the main beam.

[0042] Specifically, in this embodiment, the lightweight strengthening membrane 6 includes a base fabric layer 8, a protective coating 9, and an auxiliary layer 10; the base fabric layer 8 is arranged between the protective coatings 9; the auxiliary layer 10 is arranged on the periphery of the corresponding protective coating 9, sandwiching the base fabric layer 8 and the protective coating 9 in the middle; the lightweight strengthening membrane 6 is bonded to the outer surface of the transverse rib 2 through the auxiliary layer 10 at the bottom.

[0043] Among the above,

[0044] The base fabric layer 8 is a fiber base fabric layer, woven from fibers, and mainly plays the role of maintaining the structural stability of the lightweight reinforcement membrane 6. The weaving method can be plain weave, twill weave or warp knitted biaxial fabric, and the fiber type is glass fiber (it can also be one or more of carbon fiber, ultra-high molecular weight polyethylene fiber, liquid crystal polymer fiber, aramid fiber, polyester fiber), and the base fabric layer 8 has a gram weight range of 500g / QUOTE , thickness range 0.4mm.

[0045] The protective coating 9 is a PVC protective coating with a thickness of 0.2 mm. It has the following protective effects: UV aging resistance, wear resistance, rain erosion resistance, high and low temperature impact resistance, acid and alkali resistance, heat and humidity aging resistance, flame retardancy, and self-cleaning, which can ensure that the composite film material has an environmental service life of more than 20 years.

[0046] The auxiliary layer 10 is a sodium naphthalene complex chemical treatment layer (it can also be a silicone resin surface modification treatment layer, a plasma surface treatment layer or a perfluoro copolymer resin treatment layer), which can simultaneously achieve good interface compatibility with the protective coating 9 and the external adherend, thereby improving the bonding performance. The thickness is 0.2 mm.

[0047] Specifically, in this embodiment, both ends of the lightweight strengthening membrane 6 are connected to the corresponding main beam 1 and the trailing edge beam 3 respectively through the epoxy structural adhesive 11 , thereby being fixed to the outer surface of the transverse rib 2 .

[0048] In this embodiment, the solid composite sandwich panels 5 in the existing wind turbine blade trailing edge structure are replaced by non-solid transverse ribs 2 (the transverse ribs 2 and the composite sandwich panels 5 are made of the same material). This not only reduces the weight of the wind turbine blade (with a maximum weight reduction of more than 20%), but also ensures the rigidity of the wind turbine blade under the action of the rib structure and the lightweight reinforcement membrane 6, so that the wind turbine blade can maintain its required aerodynamic shape when rotating.

[0049] Example 2

[0050] Compared with the first embodiment, this embodiment Figure 5 As shown, both ends of the lightweight strengthening membrane 6 are connected to the corresponding main beam 1 and the trailing edge beam 3 respectively through non-metallic bolts 12, thereby being fixed to the outer surface of the transverse rib 2.

[0051] Furthermore, the non-metallic bolts 12 are glass fiber reinforced plastic bolts to meet the requirements of lightning protection of the bolts on the blades, and meet the requirements of high mechanical stiffness, corrosion resistance, light weight, good fatigue performance, etc.

[0052] In addition, the non-metallic bolts 12 may also be insulating FRP (fiber reinforced plastic) bolts such as basalt fiber reinforced bolts and aramid fiber reinforced bolts, or thermoplastic insulating bolts such as polyphenylene sulfide, polyetheretherketone, and nylon.

[0053] The above-described embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any changes made based on the shape and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lightweight wind turbine blade structure, characterized in that: Including main beam, leading edge structure and trailing edge structure; The trailing edge structure includes transverse ribs and trailing edge beams; The transverse ribs are connected between the main beam and the trailing edge beam, and the outer surface of the transverse ribs is paved with a lightweight strengthening membrane; The leading edge structure is connected to an end of the main beam away from the trailing edge structure.

2. A lightweight wind turbine blade structure according to claim 1, characterized in that: Each rib of the transverse rib is hollow.

3. The lightweight wind turbine blade structure according to claim 1, characterized in that: An installation groove is provided at one end of the transverse rib plate connected to the main beam.

4. The lightweight wind turbine blade structure according to claim 1, characterized in that: The lightweight reinforced membrane includes a base fabric layer, a protective coating layer, and an auxiliary layer; The base fabric layer is provided between the protective coating layers; The auxiliary layer is arranged on the periphery of the corresponding protective coating layer, sandwiching the base fabric layer and the protective coating layer; The lightweight strengthening membrane is adhered to the outer surface of the transverse rib through the auxiliary layer at the bottom.

5. The lightweight wind turbine blade structure according to claim 4, characterized in that: The base fabric layer is a fiber base fabric layer.

6. The lightweight wind turbine blade structure according to claim 4, characterized in that: The protective coating is a PVC protective coating, a PTFE protective coating, a PVF protective coating, a PVDF protective coating or an ETFE protective coating.

7. The lightweight wind turbine blade structure according to claim 1, characterized in that: Both ends of the lightweight strengthening membrane are connected to the corresponding main beam and trailing edge beam respectively through epoxy structural adhesive, thereby being fixed to the outer surface of the transverse rib plate.

8. The lightweight wind turbine blade structure according to claim 1, characterized in that: Both ends of the lightweight strengthening membrane are connected to the corresponding main beam and the trailing edge beam respectively through non-metallic bolts, thereby being fixed to the outer surface of the transverse rib plate.

9. A lightweight wind turbine blade structure according to any one of claims 1 to 8, characterized in that: Webs are provided between the main beams.

10. The lightweight wind turbine blade structure according to claim 9, characterized in that: The web is in contact with one end of the transverse rib.

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