Blade with rain cover, manufacturing method and wind turbine generator

Abstract

The invention provides a blade with a rain cover, a manufacturing method and a wind turbine generator, and belongs to the technical field of fan blades. The blade comprises a blade body, and a pre-prepared target mounting area is arranged on the blade root section of the blade body; the rainproof cover is arranged on a pre-prepared target mounting area of the blade body; the reinforcing mechanism is arranged on the blade body, fixedly connected with the rain cover and used for increasing the structural strength between the rain cover and the blade body; the reinforcing mechanism comprises an annular connecting plate arranged on the blade body; the connecting pieces are arranged on the annular connecting plate at intervals, included angles are formed between the connecting pieces and the annular connecting plate, and each connecting piece is fixedly connected with the rainproof cover. The device has the advantages of being accurate in installation and positioning, simple in structure, high in stability and capable of effectively preventing rain.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blades, and in particular to a blade with a rainproof cover, a method for manufacturing a blade with a rainproof cover, and a wind turbine generator set. Background Art

[0002] As a clean and renewable energy source, wind energy has the unique advantages of large single-unit capacity and relatively mature technology. Compared with nuclear energy, wind energy has higher safety; compared with hydropower, wind energy has greater development potential; compared with solar energy, wind energy has lower development costs. The installed capacity of wind turbines is gradually increasing.

[0003] In a wind turbine generator set, wind turbine blades are important devices that convert wind energy into electrical energy. Wind turbines usually operate under complex and harsh conditions. During use, they often encounter weather such as heavy rain. At present, in order to avoid problems such as damage to mechanical and electrical components in the hub caused by rain flowing down the blades, it is usually necessary to install rain covers on wind turbine blades. The blade rain covers match the hub cover of the whole machine to protect electrical components from rain and other damage. However, the installation of rain covers is generally carried out by manual or tooling, and then installed by bonding with adhesives. Manual positioning often results in inaccurate positioning dimensions, which may lead to certain deviations in the installation and positioning of the rain cover. If the deviation is large, it may lead to inappropriate matching with the hub cover, and it is easy to leak or interfere with other problems. In addition, tooling positioning also has certain disadvantages. Due to differences in the size of the blade root airfoil pitch circle, different blades need to prepare tooling of various specifications and sizes. In particular, with the acceleration of the frequency of blade model updates and replacements, tooling that is only suitable for the installation of a single model of blade rain covers is bound to cause a waste of resources and can no longer meet the needs. In the prior art, the following patents involve the installation of wind turbine blade rain shields: Patent CN220599937U discloses a wind turbine blade rain shield installation device, which, through the arrangement of an adjustment box, a positioning block, a round rod, an elliptical block, a positioning cylinder, a limit spring, a positioning rod, a cross plate and a limit rod, enables the wind turbine blade rain shield to be easily and quickly assembled and positioned and installed, but the installation device has a complex structure, is not practically operable, and cannot meet the installation requirements of various models. Patent CN217440220U discloses a rain shield, a wind turbine blade and a wind turbine generator set, wherein the rain shield includes a plurality of rainproof units, connectors and fasteners. The rain cover is composed of multiple rainproof units spliced ​​into a closed annular cover body through connectors. By adjusting the position of the fasteners in the waist-shaped hole to change the inner diameter of the annular cover body, the rain cover can be matched with different blade root sizes of wind turbine blades, increasing the adaptability and assembly adaptability of the rain cover. However, this method is complex and trivial in structure, and in the process of splicing multiple rainproof units, the shape of the rain cover cannot be effectively guaranteed, and accurate positioning and installation cannot be achieved. Patent CN109268218A discloses a wind turbine blade rain cover and a wind turbine generator set and a method for installing the rain cover. This patent mainly realizes that the guide rails on both sides or one side of the rain cover body completely seal the hub cover and the blade, and realize smooth relative rotation, mainly to improve the sealing and matching of the rain cover and the hub cover, but the slide rails and sliders of this method are complex, and the actual guide rail positioning is not easy to operate, resulting in the subsequent actual effect failing to meet expectations.

[0004] Therefore, the current tooling structure or process for installing the rain cover is complex and cannot meet the requirements for accurate positioning and installation of various models. In addition, the manual method is used, which results in installation errors, and is prone to leaks and interference. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a blade with a rain cover, a manufacturing method and a wind turbine set, so as to solve the above-mentioned problem that the tooling structure or process of the current rain cover installation is complex, cannot meet the requirements of various models, and adopts manual methods, resulting in installation errors, and prone to rain leakage or interference.

[0006] In order to achieve the above objectives, in a first aspect, an embodiment of the present invention provides a blade with a rain cover, the blade comprising: A blade body, wherein a pre-prepared target installation area is provided on a blade root section of the blade body; A rain cover is arranged on a pre-prepared target installation area of ​​the blade body; A reinforcing mechanism, which is arranged on the blade body and fixedly connected to the rain cover, and is used to increase the structural strength between the rain cover and the blade body; The strengthening mechanism includes: An annular connecting plate, arranged on the blade body; A plurality of connecting pieces are arranged on the annular connecting plate at intervals and have an angle with the annular connecting plate, and each connecting piece is fixedly connected to the rain cover.

[0007] Optionally, the rain cover is composed of an annular mounting portion, a connecting portion and a rainproof portion which are connected in sequence; The annular mounting portion is mounted on a pre-prepared target mounting area of ​​the blade body and assembled and mounted with the outer surface of the blade body; An accommodating space is formed between the connecting portion, the rainproof portion and the blade body, the reinforcing mechanism is located in the accommodating space, and the connecting portion is connected to a connecting piece of the reinforcing mechanism.

[0008] Optionally, the annular mounting portion and the blade body are fixed by gluing.

[0009] Optionally, the angle between the connecting piece and the annular connecting plate and the angle between the annular mounting portion and the connecting portion are complementary angles.

[0010] Optionally, a mesh pattern is provided on the surface where the rain cover is connected to the connecting piece to increase the contact area.

[0011] In a second aspect, an embodiment of the present invention further provides a method for manufacturing a blade with a rain cover, which is used to manufacture the above-mentioned blade with a rain cover, and the method comprises: Step S1, according to the theoretical installation position of the rain cover, determine the rain cover installation position mark with a preset depth on the blade positive mold, and perform the blade negative mold on the blade positive mold to obtain the blade forming mold, the blade forming mold has a reinforcement mechanism installation area and a positioning line, and the positioning line is used to form a target installation area on the blade during the blade forming process; Step S2, applying a release agent and laying a release cloth on the blade forming mold; Step S3, after laying a layer of demoulding cloth in the reinforcement mechanism installation area of ​​the blade forming mold, lay the reinforcement mechanism in the reinforcement mechanism installation area, and lay a polytetrafluoroethylene film or a vacuum bag film in the area where the connecting piece of the reinforcement mechanism is located, and wrap the connecting piece layer to form a sealed space; Step S4, laying a blade ply on the blade forming mold, and laying a release cloth, an isolation film, a guide net, a bonding vacuum bag film, and plugging an exhaust pipe and a rubber inlet pipe on the ply; Step S5, using a vacuum infusion process to form the blade, and demoulding the blade after a first preset time; Step S6, unfolding the connecting piece of the reinforcing mechanism to a preset angle; Step S7: fix the rain cover to the pre-prepared target installation area, and connect and fix the connecting piece to the rain cover.

[0012] Optionally, in step S2, applying a release agent and laying a release cloth on the blade forming mold includes: Step S21, applying a release agent on the blade forming mold; Step S22: after a second preset time has passed since the release agent is applied, a release cloth is laid on the blade forming mold.

[0013] Optionally, in step S2, applying a release agent and laying a release cloth on the blade forming mold includes: Step S21, applying a release agent on the blade forming mold; Step S22: After the release agent forms a film, a release cloth is laid on the blade forming mold.

[0014] Optionally, in step S3, before placing the reinforcement mechanism in the reinforcement mechanism installation area, the method further includes: The connecting piece of the reinforcing mechanism is wrapped with a polytetrafluoroethylene film or a vacuum bag film.

[0015] In a third aspect, an embodiment of the present invention further provides a wind turbine generator set, comprising the above-mentioned blade with a rain cover.

[0016] This technical solution forms a target installation area on the blade body when manufacturing the blade body to indicate the installation position of the rain cover, thereby ensuring the accuracy of the installation position. In addition, a reinforcing mechanism is provided to increase the structural strength of the connection part to improve the service life. The overall structure is simple and stable, which effectively improves the strength and reliability of the assembly with the hub cover and avoids the risks of rain leakage and interference.

[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a schematic structural diagram of a blade with a rain cover provided by the present invention; Figure 2 is a front view of a blade with a rain cover provided by the present invention; Figure 3 It is a schematic structural diagram of the rain cover provided by the present invention; Figure 4 is a structural schematic diagram of the strengthening mechanism provided by the present invention; Figure 5 The present invention is a flowchart of a method for manufacturing a blade with a rain cover.

[0019] Description of Reference Numerals 1 - blade body; 2 - rain cover; 21 - annular mounting portion 22 - connection part; 23 - rainproof part; 3 - reinforcement mechanism 31 - annular connecting plate; 32 - connecting piece. DETAILED DESCRIPTION

[0020] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0021] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the inventive product is usually placed when in use.

[0022] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0023] The terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0024] The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Figure 1 It is a schematic structural diagram of a blade with a rain cover provided by the present invention; Figure 2 is a front view of a blade with a rain cover provided by the present invention; Figure 3 It is a schematic structural diagram of the rain cover provided by the present invention; Figure 4 is a structural schematic diagram of the strengthening mechanism provided by the present invention; Figure 5 The present invention is a flowchart of a method for manufacturing a blade with a rain cover.

[0028] like Figure 1-4 As shown, this embodiment provides a blade with a rain cover, and the blade includes: A blade body 1, wherein a pre-prepared target installation area is provided on a blade root section of the blade body 1; A rain cover 2 is arranged on a pre-prepared target installation area of ​​the blade body 1; A reinforcing mechanism 3, which is arranged on the blade body 1 and is fixedly connected to the rain cover 2, and is used to increase the structural strength between the rain cover 2 and the blade body 1; The strengthening mechanism 3 comprises: An annular connecting plate 31 is provided on the blade body 1; A plurality of connecting pieces 32 are arranged at intervals on the annular connecting plate 31 and form an angle with the annular connecting plate 31 . Each connecting piece 32 is fixedly connected to the rain cover 2 .

[0029] Specifically, in this embodiment, a target installation area is formed on the blade when the blade is formed, so that position guidance can be provided when the rain cover 2 is subsequently installed to ensure the accuracy of the installation position, rain protection, and interference avoidance. In addition, since the working environment of the blade is relatively harsh, a reinforcing mechanism 3 is provided to connect the rain cover 2 and the blade body 1, which can ensure the overall strength of the connection part and improve the service life. According to the shape and structure of the blade, the reinforcing mechanism 3 is provided to include an annular connecting plate 31 and a plurality of connecting pieces 32. The annular connecting plate 31 is sleeved on the blade body 1, and can be integrally formed with the blade, or fixed by pasting; the connecting piece 32 is provided in plurality, which can be specifically determined according to the use environment. Generally, the more the number of connecting pieces 32, the greater the structural strength.

[0030] Further, in this embodiment, the rain cover 2 is configured to be composed of an annular mounting portion 21, a connecting portion 22 and a rain protection portion 23 connected in sequence; The annular mounting portion 21 is subsequently mounted on a pre-prepared target mounting area of ​​the blade body, and assembled and mounted with the outer surface of the blade body 1; The connection portion 22 , the rainproof portion 23 and the blade body 1 form a receiving space, the reinforcement mechanism 3 is located in the receiving space, and the connection portion 22 is connected to the connection piece 32 of the reinforcement mechanism 3 .

[0031] Specifically, the connecting portion 22 may have a certain angle with the annular mounting portion 21 , or may be directly vertically arranged.

[0032] In one embodiment, the annular mounting portion 21 and the rainproof portion 23 are hollow cylindrical thin-walled structures, the diameter of the annular mounting portion 21 is smaller than the diameter of the rainproof portion 23, and the connecting portion 22 is a reducer structure with a hollow interior.

[0033] In one embodiment, the annular mounting portion 21 adopts a hollow cylindrical thin-wall structure, and the rainproof portion 23 and the connecting portion 22 adopt a reducer structure with a hollow interior.

[0034] Furthermore, the annular mounting portion 21 is fixed to the blade body 1 by gluing or hand lamination.

[0035] Specifically, in this embodiment, the connection is stable, the operation is convenient and the cost is low by pasting.

[0036] Furthermore, the angle between the connecting piece 32 and the annular connecting plate 31 and the angle between the annular mounting portion 21 and the connecting portion 22 are complementary angles.

[0037] Specifically, in this embodiment, the angle between the connecting piece 32 and the annular connecting plate 31 is complementary to the angle between the annular mounting portion 21 and the connecting portion 22, so that the connecting piece 32 and the connecting portion 22 are parallel to each other, thereby ensuring the contact area of ​​the parts, thereby enhancing the structural strength of the connecting parts and improving the service life.

[0038] Furthermore, a mesh is provided on the surface where the rain cover 2 is connected to the connecting piece 32. When the rain cover 2 is connected to the connecting piece 32, the connecting parts will contact each other. Therefore, a mesh is provided on the surface where the rain cover 2 is connected to the connecting piece 32, which can increase the contact area and ensure the bonding effect.

[0039] like Figure 5 As shown, this embodiment provides a method for manufacturing a blade with a rain cover, which is used to manufacture the above-mentioned blade with a rain cover, and the method includes: Step S1, according to the theoretical installation position of the rain cover, determine the rain cover installation position mark with a preset depth on the blade positive mold, and perform the blade negative mold on the blade positive mold to obtain the blade forming mold, the blade forming mold has a reinforcement mechanism installation area and a positioning line, and the positioning line is used to form a target installation area on the blade during the blade forming process; Step S2, applying a release agent and laying a release cloth on the blade forming mold; Step S3, laying a layer of demoulding cloth in the reinforcement mechanism installation area of ​​the blade forming mold, so that the surface of the subsequently formed annular reinforcement plate becomes a rough bonding surface, which is conducive to bonding. Then lay the reinforcement mechanism in the reinforcement mechanism installation area, and lay polytetrafluoroethylene film or vacuum bag film in the area where the connecting piece of the reinforcement mechanism is located, and use it to wrap the connecting piece layer area, so that the connecting piece area where the layer is laid forms a closed space; Step S4, laying a blade ply on the blade forming mold, and laying a release cloth, an isolation film, a guide net, a bonding vacuum bag film, and plugging an exhaust pipe and a rubber inlet pipe on the ply; Step S5, using a vacuum infusion process to form the blade, and demoulding the blade after a first preset time; Step S6, unfolding the connecting piece of the reinforcing mechanism to a preset angle; Step S7: fix the rain cover to the pre-prepared target installation area, and connect and fix the connecting piece to the rain cover.

[0040] Specifically, in the process of manufacturing the blade mold, according to the locations where the rain cover and the reinforcement mechanism are installed, the installation positions of the rain cover and the reinforcement mechanism are marked in the male mold area, and a certain thickness is considered, and then the blade female mold is remade on the male mold. Through the positioning marks, the remade blade mold has a clear positioning line and reinforcement mechanism installation area at the location where the rain cover is installed.

[0041] In one embodiment, steps S2-S7 specifically include: applying a layer of release agent in the mold, and after drying, laying a layer of release cloth in the area with the positioning line in the mold, laying a layer of annular release cloth at the position of the reinforcement mechanism, and then laying a layer of polytetrafluoroethylene film or vacuum bag film at the position of the reinforcement mechanism connecting piece, and then laying the biaxial cloth annular structure and its connecting piece and other reinforcement mechanisms on the mold in sequence, and wrapping the connecting piece of the reinforcement mechanism with polytetrafluoroethylene film or vacuum bag film, so that each connecting piece area forms a closed space, and then laying a normal blade layer on it.

[0042] Secondly, after demoulding and before painting, the multiple connecting pieces of the reinforcement mechanism are unfolded and folded outward and upward along the thickness direction of the blade. The prefabricated rain shield is positioned according to the positioning position, and then the multiple connecting pieces of the erected reinforcement mechanism are bonded together with the vertical surface of the rain shield, so that the reinforcement mechanism and the prefabricated rain shield are bonded together to form the reinforcement mechanism of the rain shield. Then, an adhesive and an indentation tape are used to install and lock the partially prefabricated rain shield along the positioning position preformed on the outer surface of the blade, so that the accurate positioning and installation of the rain shield can be achieved.

[0043] In one embodiment, step S2, applying a release agent and laying a release cloth on the blade forming mold, comprises: Step S21, applying a release agent on the blade forming mold; Step S22: after a second preset time has passed since the release agent is applied, a release cloth is laid at a subsequent bonding position on the blade forming mold.

[0044] The specific drying time can be set according to the instructions or experience. After drying for a certain period of time, the release cloth can be laid.

[0045] In another embodiment, step S2, applying a release agent and laying a release cloth on the blade forming mold, comprises: Step S21, applying a release agent on the blade forming mold; Step S22: After the release agent forms a film, a release cloth is laid on the blade forming mold.

[0046] Specifically, after applying the release agent on the blade forming mold, in order to ensure the demoulding effect, it is necessary to wait until the surface of the release agent is dry and forms a film before laying the release cloth at the subsequent bonding position. Therefore, the judgment is made directly based on experience.

[0047] Furthermore, in step S3, before placing the reinforcement mechanism in the reinforcement mechanism installation area, the method further includes: A layer of demoulding cloth is laid in the reinforcement mechanism laying area of ​​the blade forming mold; a polytetrafluoroethylene film is laid in multiple connecting piece areas of the reinforcement mechanism, and then the connecting piece laying layer of the reinforcement mechanism is wrapped to form an enclosed space in the connecting piece laying area to prevent resin from infiltrating into the connecting piece during the blade infusion process.

[0048] This embodiment provides a wind turbine generator set, including the blade with the rain cover mentioned above.

[0049] Embodiment 1: First, in the process of manufacturing the blade mold, according to the installation position of the rain cover and the requirements of the area 805-900mm, the installation position of the rain cover is made in the male mold area, the distance is measured from the blade root and the positioning lines of the two positions 805mm and 900mm are drawn, with a certain thickness of 0.59mm, and then the blade female mold is remade on the male mold. The female mold remade by this male mold has a clear positioning line depth of about 0.59mm at the installation position of the rain cover. Secondly, apply a layer of release agent in the blade mold, wait for it to dry, then lay a layer of demoulding cloth in the area with 805mm-900mm positioning line in the mold, lay a layer of polytetrafluoroethylene film or vacuum bag film in the position of the connecting piece of the reinforcing mechanism, and then lay the reinforcing mechanism layer on the mold in sequence, biaxial cloth 2AX800, the laying order is 3 layers ±45°, where the length of the connecting piece of the biaxial reinforcing mechanism is 100mm, and then, wrap the connecting piece layer of the reinforcing mechanism with polytetrafluoroethylene film or vacuum bag film, so that the connecting piece layer forms a closed space. Then lay the normal blade layer on it, after the layer is completed, lay the demoulding cloth, isolation film, and guide net on the layer structure in sequence; bond the vacuum bag film, plug the exhaust pipe and the rubber inlet pipe, and use the vacuum infusion process to introduce the epoxy resin system into the layer. After curing, demoulding. The annular connecting plate 31 of the reinforcing mechanism and the blade are co-cured into one.

[0050] Then, after the demoulding, the reinforcing mechanism is protected from being painted, and the connecting piece 32 of the reinforcing mechanism without resin injection is unfolded and erected outward and upward along the thickness direction of the blade. Then, polyurethane or epoxy resin adhesive is applied to the positioning position 805-900mm of the blade molding, and the partially prefabricated rain cover is installed using an indentation belt. Then, the connecting piece of the reinforcing mechanism is installed on the prefabricated rain cover facade using a hand-paste process, as a rain cover reinforcement mechanism, together with the molded positioning area, the accurate positioning and installation of the rain cover can be achieved.

[0051] Embodiment 2: In the process of manufacturing blade molds, according to the installation position of the rain cover and the requirements of the area 700mm-900mm, the installation position of the rain cover is made in the male mold area, the distance is measured from the blade root and the positioning lines of the two positions of 700mm and 900mm are drawn. According to the different positioning requirements of the rain cover of the whole machine, multiple positioning lines can be made and marked. There is a certain thickness of 0.2mm, and then the blade female mold is made on the male mold. The female mold made by this male mold has a clear positioning line depth of about 0.2mm at the installation position of the rain cover. Secondly, apply a layer of release agent in the blade mold, wait for it to dry, then lay a layer of demoulding cloth in the area of ​​the 700mm-900mm positioning line in the mold, lay a layer of polytetrafluoroethylene film or vacuum bag film in the position of the connecting piece of the reinforcement mechanism, and then lay the reinforcement mechanism layer according to the cut shape on the mold, triaxial cloth 3AX973, the laying order is 4 layers ±45 / 0°, among which the length of the connecting piece of the triaxial reinforcement mechanism is 85mm, and then, wrap the connecting piece layer of the reinforcement mechanism with polytetrafluoroethylene film or vacuum bag film, so that the connecting piece layer forms a closed space. Then lay the normal blade layer on it, and after the layer is completed, lay the demoulding cloth, isolation film, and guide net on the layer structure in turn; bond the vacuum bag film, plug the exhaust pipe and the rubber inlet pipe, and use the vacuum infusion process to introduce the epoxy resin system into the layer. After curing, demoulding. The annular connecting plate 31 of the reinforcement mechanism and the blade are co-cured into one.

[0052] Then, after the demoulding, the reinforcing mechanism is protected from being painted, and the multiple connecting pieces 32 of the reinforcing mechanism that are not infused with resin are unfolded and erected outward and upward along the thickness direction of the blade. Then, polyurethane or epoxy resin adhesive is applied on the positioning position 700-900mm of the blade molding, and the partially prefabricated rain cover is installed using an indentation belt. Then, the multiple connecting pieces of the reinforcing mechanism are installed on the prefabricated rain cover facade using a hand-paste process, as a rain cover reinforcement mechanism, together with the molded positioning area, the accurate positioning and installation of the rain cover can be achieved.

[0053] The resin is epoxy resin or polyurethane resin.

[0054] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0055] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor (processor) perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0056] The optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, the technical scheme of the embodiments of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner when there is no contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations. In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A blade with a rain cover, characterized in that: The blade comprises: A blade body (1), wherein a pre-prepared target installation area is provided on a blade root section of the blade body (1); A rain cover (2) is arranged on a pre-prepared target installation area of ​​the blade body (1); A reinforcing mechanism (3), arranged on the blade body (1) and fixedly connected to the rain cover (2), and used to increase the structural strength between the rain cover (2) and the blade body (1); The strengthening mechanism (3) comprises: An annular connecting plate (31) arranged on the blade body (1); A plurality of connecting pieces (32) are arranged at intervals on the annular connecting plate (31) and form an angle with the annular connecting plate (31); each connecting piece (32) is fixedly connected to the rain cover (2).

2. The blade with a rain cover according to claim 1, characterized in that: The rain cover (2) is composed of an annular mounting portion (21), a connecting portion (22) and a rain protection portion (23) which are connected in sequence; The annular mounting portion (21) is mounted on a pre-prepared target mounting area of ​​the blade body, and is assembled and mounted with the outer surface of the blade body (1); An accommodation space is formed between the connecting portion (22), the rainproof portion (23) and the blade body (1); the reinforcing mechanism (3) is located in the accommodation space; and the connecting portion (22) is connected to a connecting piece (32) of the reinforcing mechanism (3).

3. The blade with rain cover according to claim 2, characterized in that: The annular mounting portion (21) and the blade body (1) are fixed by gluing.

4. The blade with a rain cover according to claim 2, characterized in that: The angle between the connecting sheet (32) and the annular connecting plate (31) and the angle between the annular mounting portion (21) and the connecting portion (22) are complementary angles.

5. The blade with a rain cover according to claim 1, characterized in that: A mesh pattern is provided on the surface where the rain cover (2) is connected to the connecting piece (32) to increase the contact area.

6. A method for manufacturing a blade with a rain cover, used for manufacturing the blade with a rain cover as claimed in any one of claims 1 to 5, characterized in that: The method comprises: Step S1, according to the theoretical installation position of the rain cover, determine the rain cover installation position mark with a preset depth on the blade positive mold, and perform the blade negative mold on the blade positive mold to obtain the blade forming mold, the blade forming mold has a reinforcement mechanism installation area and a positioning line, and the positioning line is used to form a target installation area on the blade during the blade forming process; Step S2, applying a release agent and laying a release cloth on the blade forming mold; Step S3, after laying a layer of demoulding cloth in the reinforcement mechanism installation area of ​​the blade forming mold, lay the reinforcement mechanism in the reinforcement mechanism installation area, and lay a polytetrafluoroethylene film or a vacuum bag film in the area where the connecting piece of the reinforcement mechanism is located, and wrap the connecting piece layer to form a sealed space; Step S4, laying a blade ply on the blade forming mold, and laying a release cloth, an isolation film, a guide net, a bonding vacuum bag film, and plugging an exhaust pipe and a rubber inlet pipe on the ply; Step S5, using a vacuum infusion process to form the blade, and demoulding the blade after a first preset time; Step S6, unfolding the connecting piece of the reinforcing mechanism to a preset angle; Step S7: fix the rain cover to the pre-prepared target installation area, and connect and fix the connecting piece to the rain cover.

7. The method for manufacturing a blade with a rain cover according to claim 6, characterized in that: In step S2, applying a release agent and laying a release cloth on the blade forming mold includes: Step S21, applying a release agent on the blade forming mold; Step S22: after a second preset time has passed since the release agent is applied, a release cloth is laid on the blade forming mold.

8. The method for manufacturing a blade with a rain cover according to claim 6, characterized in that: In step S2, applying a release agent and laying a release cloth on the blade forming mold includes: Step S21, applying a release agent on the blade forming mold; Step S22: After the release agent forms a film, a release cloth is laid on the blade forming mold.

9. The method for manufacturing a blade with a rain cover according to claim 6, characterized in that: In step S3, before placing the reinforcement mechanism in the reinforcement mechanism installation area, the method further includes: The connecting piece of the reinforcing mechanism is wrapped with a polytetrafluoroethylene film or a vacuum bag film.

10. A wind turbine generator set, characterized in that: The invention comprises a blade with a rain cover according to any one of claims 1 to 5.

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