Wind power generation blade and rapid maintenance method of wind power generation blade

Abstract

The invention relates to a wind power generation blade and a rapid maintenance method of the wind power generation blade, the wind power generation blade comprises a first blade layer, an original inner core layer and a second blade layer which are stacked, the second blade layer is provided with a repairing through hole, and the original inner core layer is provided with a damage removing hole. The damage removing hole is communicated with the repairing through hole and extends to the inner surface of the first blade layer; a recovery structure layer connected with the second blade layer is arranged at the repair through hole; one or more repairing core pieces are arranged in the damage removing hole; and the one or more repairing core pieces and the repairing core pieces as well as the repairing core pieces and the first blade layer are connected through continuous colloid filling and curing, and a repairing inner core layer is formed. Compared with the prior art, when the wind power generation blade is maintained in a wind field, the maintenance time is short, the operation is simple, the maintenance quality is stable, the structural performance is excellent after maintenance, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generators, and relates to a wind power generation blade and a rapid maintenance method for the wind power generation blade. Background Art

[0002] Wind power generation is a clean and pollution-free renewable energy source with a wide distribution range, flexible installation, and little impact on the ecological environment. Therefore, it is increasingly valued by countries around the world. Driven by the dual-carbon policy, the domestic wind power industry has developed rapidly, with a significant increase in annual new deliveries. As we all know, blades are the core components of wind turbines, mainly composed of composite materials, including a large number of sandwich structures. Sandwich structure damage often occurs during the transportation, installation and operation of blades. In the past, after the blades failed in the wind farm, the traditional repair method was mostly injection repair. Due to the limitations of wind farm conditions, it is necessary to manually mix the resin, the weighing ratio is difficult to control, and the degassing effect is poor; the resin injection and curing time is long, and the repair quality is difficult to guarantee; to ensure that the resin Tg is qualified, it is necessary to heat the inner and outer surfaces of the blade at the same time, which is difficult to operate. In addition, the defective repair area often fails repeatedly during the subsequent operation, causing problems such as secondary repair. Therefore, for the damage recovery of the blade sandwich structure, a repair method with short time, simple operation, reliable quality, and excellent repair structure performance is urgently needed. Summary of the invention

[0003] The purpose of the present invention is to provide a wind power generation blade and a quick maintenance method for the wind power generation blade with short maintenance time, simple operation, reliable quality and excellent maintenance structure performance.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A first aspect of the present invention provides a wind turbine blade, comprising a first blade layer, an original inner core layer and a second blade layer which are stacked, wherein a repair through hole is provided on the second blade layer, and a damage removal hole is provided on the original inner core layer, wherein the damage removal hole is connected to the repair through hole and extends to the inner surface of the first blade layer;

[0006] The repair through hole is provided with a recovery structure layer connected to the second blade layer;

[0007] One or more repair cores are arranged in the damage removal hole, and one or more repair cores and the repair cores and the first blade layer are connected by continuous colloid filling and curing to form a repair inner core layer.

[0008] Furthermore, the repair core piece is obtained by preforming the reinforcing material and the core material;

[0009] The recovery structure layer is obtained by wet hand lay-up, vacuum infusion or prefabrication.

[0010] Furthermore, the core material is one of balsa wood core material, PVC foam core material, PET foam core material, PU foam core material, PP foam core material, PA foam core material or paulownia wood core material.

[0011] Furthermore, the reinforcing material is a resin, or a composite material of a resin and a fiber; wherein the resin is selected from at least one of epoxy resin, polyurethane resin, unsaturated polyester resin, vinyl resin or nylon resin, and the fiber is selected from at least one of glass fiber, carbon fiber, polyester fiber, aramid fiber, boron fiber, polyparaphenylene benzobisoxazole fiber or basalt fiber.

[0012] Furthermore, the molding method of the repair core is one of immersion curing molding, wet hand lay-up molding, prepreg molding, vacuum introduction molding, winding molding, injection molding, RTM molding or pultrusion molding.

[0013] Furthermore, the dimensions of the repair core member include: a length of 10 to 1000 mm; a width of 10 to 200 mm; and a thickness that is 0.5 to 6 mm smaller than the thickness of the inner core in the original inner core layer.

[0014] Furthermore, the colloid is one of epoxy system colloid, acrylic system colloid, polyurethane system colloid or organic silicone system colloid, and the curing temperature is 15 to 35°C.

[0015] Furthermore, the thickness of the colloid after solidification is 0.5 to 6 mm.

[0016] A second aspect of the present invention provides a rapid maintenance method for a wind power generation blade, wherein the wind power generation blade comprises a stacked second blade layer, an original inner core layer having a blade inner core defect, and a first blade layer, and the rapid maintenance method comprises the following steps:

[0017] S1: determining the damaged area of ​​the blade inner core, removing the corresponding area structures on the second blade layer and the original inner core layer in sequence, forming a repair through hole on the second blade layer, and forming a damage removal hole on the original inner core layer;

[0018] S2: Select a combination of repair cores with appropriate size and enhancement effect according to the defect size and the type of the original inner core layer material;

[0019] S3: applying a colloid in the damage removal hole, and then arranging a repair core or arranging a plurality of repair cores in parallel on the colloid, and filling the space between the repair core and the damage removal hole and the inner surface of the first blade layer, and between the plurality of repair cores with the colloid;

[0020] S4: Wet hand paste or bonding of prefabricated glass fiber reinforced plastic plates on the surface of the repaired core and the repaired through holes to obtain a restored structural layer;

[0021] S5: Maintain vacuum pressure, cure at room temperature or heat the surface to complete the repair of the damaged blade structure.

[0022] A third aspect of the present invention provides a rapid maintenance method for a wind power generation blade, wherein the wind power generation blade comprises a stacked second blade layer, an original inner core layer having a blade inner core defect, and a first blade layer, and the rapid maintenance method comprises the following steps:

[0023] S1: determining the damaged area of ​​the blade inner core, removing the corresponding area structures on the second blade layer and the original inner core layer in sequence, forming a repair through hole on the second blade layer, and forming a damage removal hole on the original inner core layer;

[0024] S2: Select a combination of repair cores with appropriate size and enhancement effect according to the defect size and the type of the original inner core layer material;

[0025] S3: applying a colloid in the damage removal hole, and then arranging a repair core or arranging a plurality of repair cores in parallel on the colloid, and filling the space between the repair core and the damage removal hole and the inner surface of the first blade layer, and between the plurality of repair cores with the colloid;

[0026] S4: Maintain vacuum pressure and cure the colloid at room temperature or by surface heating;

[0027] S5: Use wet hand paste to vacuum infuse or bond prefabricated FRP panels to restore the structural layer on the surface of the repaired core and the repaired through holes;

[0028] S6: Maintaining the vacuum pressure, the surface is heated and solidified to complete the repair of the damaged blade structure.

[0029] Furthermore, in step S4, room temperature curing includes: curing at 15-35° C. for 1 hour under vacuum pressure in the damage removal hole; heating curing includes: curing at 70-80° C. for 0.5 hour under vacuum pressure in the damage removal hole.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a wind turbine blade and a method for quickly repairing a wind turbine blade, which can realize the repair of a sandwich structure of a wind turbine blade in a wind farm with short time, simple operation, reliable quality, excellent repair structure performance, and elimination of potential rework risks; compared with conventional ply-laying and pouring repair methods, 3 to 5 hours of repair time can be saved, and repair costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1It is a structural schematic diagram of a wind power generation blade in the present invention;

[0033] Figure 2 A schematic diagram of the structure of a blade after the inner core defect of the blade is removed in a rapid repair method of a wind power blade in the present invention;

[0034] Figure 3 A schematic diagram of a process flow of a rapid maintenance method for wind turbine blades in the present invention;

[0035] Figure 4 It is a schematic diagram of the enhanced structure type of the repair core member in the present invention;

[0036] Figure 5 It is a schematic diagram of the immersion molding reinforcement process of the repair core member in the present invention;

[0037] Figure 6 A physical picture of the sandwich structure of the reinforced balsa wood repair blade in the present invention;

[0038] Figure 7 It is a schematic diagram of the vacuum infusion molding reinforcement process of the repair core in the present invention;

[0039] Figure 8 A physical picture of the sandwich structure of the enhanced PET repair blade in the present invention;

[0040] Fig. 9 It is a schematic diagram of the wet hand lay-up forming reinforcement process of the repair core member in the present invention;

[0041] Description of the markings in the figure:

[0042] 10-original inner core layer, 11-first blade layer, 12-second blade layer, 13-repair inner core layer, 14-repair core member, 15-damage removal hole, 16-repair through hole, 17-restore structure layer, 31-reinforcement material, 32-core material, 41-epoxy resin, 42-balsa wood, 43-release cloth, 51-PET core material, 52-biaxial 800 glass fiber, 61-PVC core material, 62-hand-laid biaxial 600 glass fiber cloth. DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 A wind turbine blade shown in the figure comprises a first blade layer 11, an original inner core layer 10 and a second blade layer 12 which are stacked, wherein a repair through hole 16 is opened on the second blade layer 12, and a damage removal hole 15 is opened on the original inner core layer 10, wherein the damage removal hole 15 is connected to the repair through hole 16 and extends to the inner surface of the second blade layer 12;

[0045] A recovery structure layer 17 connected to the second blade layer 12 is provided at the repair through hole 16;

[0046] One or more repair cores 14 are arranged in the damage removal hole 15, and one or more repair cores 14 and the repair cores 14 and the first blade layer 11 are connected by continuous colloid filling and curing to form a repair inner core layer;

[0047] The repair core 14 is preformed by composite of the reinforcement material 31 and the core material 32;

[0048] The recovery structure layer 17 is obtained by wet hand lay-up, vacuum infusion or prefabrication.

[0049] In some specific embodiments, the first blade layer 11 and the second blade layer 12 are glass fiber reinforced plastic laminates, which may be a composite material of glass fiber and epoxy resin or polyurethane, or a composite material of carbon fiber and epoxy resin or polyurethane.

[0050] In some specific embodiments, the damage removal hole 15 is a square slot.

[0051] The repair core 14 is a rectangular parallelepiped core, and the length direction of the rectangular parallelepiped core arranged in the damage removal hole 15 is consistent with the length direction of the blade.

[0052] In some preferred embodiments, the rectangular parallelepiped core is a flat plate structure without slots, holes or closed holes.

[0053] In some optional embodiments, the core material 32 is one of balsa wood core material, PVC foam core material, PET foam core material, PU foam core material, PP foam core material, PA foam core material or paulownia wood core material.

[0054] In some specific embodiments, Figure 3 As shown, the composite forms of the core material 32 and the reinforcement material 31 include internal reinforcement, external reinforcement, and external + internal reinforcement.

[0055] In some optional embodiments, the reinforcing material 31 is a resin, or a composite material of a resin and a fiber; wherein the resin is selected from at least one of epoxy resin, polyurethane resin, unsaturated polyester resin, vinyl resin or nylon resin, and the fiber is selected from at least one of glass fiber, carbon fiber, polyester fiber, aramid fiber, boron fiber, polyparaphenylene benzobisoxazole fiber or basalt fiber.

[0056] In some preferred embodiments, if the material of the repair core 14 is reinforced PET, each repair core 14 includes at least one reinforced fiberglass, and the length direction of the reinforced fiberglass is laid along the length direction of the blade when in use.

[0057] In some preferred embodiments, if the material of the repair core 14 is reinforced PVC, each repair core 14 includes at least one reinforced fiberglass reinforced plastic, and the length direction of the reinforced fiberglass reinforced plastic is laid along the length direction of the blade when in use.

[0058] In some optional embodiments, the molding method of the repair core 14 is one of immersion curing molding, wet lay-up molding, prepreg molding, vacuum infusion molding, winding molding, injection molding, RTM molding or pultrusion molding.

[0059] In some optional embodiments, the dimensions of the repair core 14 include: length of 10 to 1000 mm, tolerance + / - 10 mm; width of 10 to 200 mm, tolerance + / - 5 mm; thickness 0.5 to 6 mm less than the core material thickness in the original inner core layer 10, tolerance + / - 0.5 mm.

[0060] In some optional embodiments, the colloid is one of epoxy system colloid, acrylic system colloid, polyurethane system colloid or organic silicone system colloid, and the curing temperature is 15-35°C.

[0061] In some optional embodiments, the thickness of the colloid after solidification is 0.5 to 6 mm.

[0062] A rapid repair method for a wind power generation blade, the wind power generation blade comprises a stacked second blade layer 12, an original inner core layer 10 having a blade inner core defect, and a first blade layer 11, such as Figure 3 As shown, the rapid repair method includes the following steps:

[0063] S1: Determine the damaged area of ​​the blade inner core, remove the corresponding area structures on the second blade layer 12 and the original inner core layer 10 in turn, form a repair through hole 16 on the second blade layer 12, and form a damage removal hole 15 on the original inner core layer 10, such as Figure 2 As shown;

[0064] S2: Select a combination of repair cores with appropriate size and enhancement effect according to the defect size and the type of the original inner core layer material;

[0065] S3: applying colloid in the damage removal hole 15, and then arranging the repair core 14 or arranging multiple repair cores 14 in parallel on the colloid, and making the colloid fill the space between the repair core 14 and the damage removal hole 15 and the inner surface of the first blade layer 11, and between the multiple repair cores 14;

[0066] S4: Wet hand-laying or bonding the prefabricated glass fiber reinforced plastic plate on the surface of the repair core 14 and the repair through hole 16 to obtain a restored structural layer 17; specifically, the structure and material used for the restored structural layer 17 are consistent with the structure and material of the second blade layer 12;

[0067] S5: Maintain vacuum pressure, cure at room temperature or heat the surface to complete the repair of the damaged blade structure;

[0068] Room temperature curing includes: curing the damage removal hole 15 and the repair through hole 16 under vacuum pressure at 15-35° C. for 1 hour;

[0069] The heating and curing process includes: heating and curing the damage removal hole 15 and the repair through hole 16 at 70-80° C. for 0.5 h under vacuum pressure.

[0070] A rapid repair method for a wind power generation blade, the wind power generation blade comprises a stacked second blade layer 12, an original inner core layer 10 having a blade inner core defect, and a first blade layer 11, such as Figure 3 As shown, the quick repair method includes the following steps:

[0071] S1: Determine the damaged area of ​​the blade inner core, remove the corresponding area structures on the second blade layer 12 and the original inner core layer 10 in turn, form a repair through hole 16 on the second blade layer 12, and form a damage removal hole 15 on the original inner core layer 10, such as Figure 8 As shown;

[0072] S2: Select a combination of repair cores with appropriate size and enhancement effect according to the defect size and the type of the original inner core layer material;

[0073] S3: applying colloid in the damage removal hole 15, and then arranging the repair core 14 or arranging multiple repair cores 14 in parallel on the colloid, and making the colloid fill the space between the repair core 14 and the damage removal hole 15 and the inner surface of the first blade layer 11, and between the multiple repair cores 14;

[0074] S4: Maintain vacuum pressure and cure the colloid at room temperature or by surface heating;

[0075] Among them, room temperature curing includes: curing at 15-35°C for 1 hour under vacuum pressure in the damage removal hole 15; heating curing includes: curing at 70-80°C for 0.5 hour under vacuum pressure in the damage removal hole 15

[0076] S5: using wet hand paste, vacuum infusion or bonding of prefabricated glass fiber reinforced plastic plates on the surface of the repair core 14 and the repair through hole 16 to obtain a restoration structure layer 17; specifically, the structure and materials used in the restoration structure layer 17 are consistent with the structure and materials of the second blade layer 12;

[0077] S6: Maintaining vacuum pressure, the surface is heated and cured at 60-70°C to complete the repair of the damaged blade structure.

[0078] In some optional embodiments, the thickness of the colloid after curing is 1-3 mm, and the size of a single colloid bubble does not exceed 50 mm*50 mm*50 mm.

[0079] In some optional embodiments, the bonding quality of the repair core can be inspected visually, by tapping and / or by a low-frequency ultrasonic detector.

[0080] In some optional embodiments, the second blade layer 12 may be formed by wet hand lay-up and vacuum infusion to restore the structural layer material.

[0081] The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0082] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0083] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0084] Embodiment 1:

[0085] like Figure 2 A method for quickly repairing a wind turbine blade suitable for a wind farm is shown, wherein the original wind turbine blade comprises a first blade layer 11, an original inner core layer 10 and a second blade layer 12 which are stacked, wherein the structural defect is located on the inner core of the original inner core layer 10;

[0086] The quick maintenance method includes two maintenance procedures. This embodiment adopts the first maintenance procedure:

[0087] S1: Determine the damaged area of ​​the original inner core layer 10 of the blade and remove the damaged core material

[0088] The defect size of the original inner core layer of the blade is 500mm*400mm. The minimum damage area is marked according to the defect size, and a repair through hole 16 is formed on the second blade layer 12 to remove the damaged core material to form a damage removal hole 15;

[0089] S2: Select the appropriate size and reinforcement combination of the repair core according to the defect size and the type of the original inner core material.

[0090] The original inner core layer 10 in this area is balsa wood structural core material, and reinforced balsa wood is selected as the repair core member;

[0091] The size of a single repair core: length 490 ~ 500mm, width 95 ~ 100mm;

[0092] The number of repair core parts is 4 in total;

[0093] Balsa wood enhancement methods Figure 5 As shown, before use, the balsa wood 42 is soaked in epoxy resin 41 (Daosheng 180 / 185), the surface fully absorbs the resin, and the surface is covered with a release cloth 43 for curing.

[0094] S3: Apply glue and repair core parts

[0095] Fill the damage removal hole 15 with an acrylic repair colloid, using a two-component glue gun and a static mixing head, with a colloid thickness of 6 to 8 mm; remove the four pieces of reinforced balsa wood surface release cloth 43, and place them one by one on the colloid surface. Press the reinforced balsa wood to the same height as the adjacent original inner core layer 10, and fill the gap between the repair core 14 and the damage removal hole 15 and the inner surface of the first blade layer 11, as well as the surface of the repair core 14 with the colloid, and remove the excess acrylic colloid.

[0096] S4: Restore the structure layer

[0097] After the reinforced balsa wood is filled, acrylic colloid is applied to the surface to eliminate the core material step, and the open cavity is filled with hand-paste resin;

[0098] The same material structure as the second blade layer 12 is laid at the repair through hole 16 by wet hand lay-up to obtain a restoration structure layer 17;

[0099] Two layers of vacuum bags are placed on the surface of the cloth layer for tightening, and an electric blanket is covered on the surface.

[0100] S5: Heating and curing

[0101] The electric blanket was set to 60°C and heated for 3 hours for curing to complete the repair of the damaged blade structure.

[0102] The actual picture of the sandwich structure of the reinforced balsa wood repair blade is as follows Figure 6 shown.

[0103] Example 2

[0104] like Figure 2 A method for quickly repairing a wind turbine blade suitable for a wind farm is shown, wherein the original wind turbine blade comprises a first blade layer 11, an original inner core layer 10 and a second blade layer 12 which are stacked, wherein the structural defect is located on the inner core of the original inner core layer 10;

[0105] The quick maintenance method includes two maintenance procedures. This embodiment adopts the second maintenance procedure:

[0106] S1: Identify the damaged area of ​​the original inner core layer of the blade and remove the damaged core material

[0107] The defect size of the original inner core layer of the blade is 400mm*400mm. The minimum damage area is marked according to the defect size, and a repair through hole 16 is formed on the second blade layer 12 to remove the damaged core material to form a damage removal hole 15;

[0108] S2: Select the appropriate size and reinforcement combination of the repair core according to the defect size and the type of the original inner core material.

[0109] The original inner core layer 10 in this area is a PET structural core material, and a reinforced PET is selected as the repair core member 14;

[0110] The size of a single repair core: length 390 ~ 400mm, width 95 ~ 100mm;

[0111] The number of repair core parts is 4 in total;

[0112] PET enhancement methods such as Figure 7 As shown, before use, PET foam 51 and biaxial 800 glass fiber 52 are stacked layer by layer, and the surface is covered with a release cloth, and vacuum infusion molding is used to infiltrate biaxial 800 glass fiber 52 and PET foam 51, and heated to solidify. Before use, the reinforced PET is cut into the required size of the repair core, and it is ensured that there is at least one biaxial 800 reinforced glass fiber inside a single repair core.

[0113] S3: Apply glue and repair core parts

[0114] Fill the damage removal hole 15 with a repair colloid of a polyurethane system, using a two-component glue gun and a static mixing head, with a colloid thickness of 6 to 8 mm; remove the four pieces of release cloth from the surface of the reinforced PET and place them one by one on the surface of the colloid. Press the reinforced PET to the same height as the adjacent original inner core layer 10, and fill the space between the reinforced PET and the damage removal hole 15 and the inner surface of the first blade layer 11 with the colloid, and remove the excess polyurethane colloid.

[0115] S4: Filling colloid solidification

[0116] After the reinforced PET is filled, a vacuum bag is arranged at the repair through hole 16 for tightening;

[0117] The curing procedure is to cure at 15°C for 1 hour; or cover with an electric blanket and heat at 70°C for 0.5 hour.

[0118] S5: Restore the structure layer

[0119] After removing the vacuum bag, sand the core steps and fill the open cavities with hand-laid resin;

[0120] Restoring the second blade layer 12 using a dry glass fiber layup vacuum infusion method;

[0121] Place two layers of vacuum bags on the surface to tighten it, and cover it with an electric blanket.

[0122] S6: Heating and curing

[0123] The electric blanket was set to 70°C and heated for 5 hours for curing.

[0124] The actual picture of the sandwich structure of the reinforced PET repair blade is as follows Figure 8 shown.

[0125] Embodiment 3:

[0126] like Figure 2 A method for quickly repairing a wind turbine blade suitable for a wind farm is shown, wherein the original wind turbine blade comprises a first blade layer 11, an original inner core layer 10 and a second blade layer 12 which are stacked, wherein the structural defect is located on the inner core of the original inner core layer 10;

[0127] The quick maintenance method includes two maintenance procedures. This embodiment adopts the first maintenance procedure:

[0128] S1: Determine the damaged area of ​​the original inner core layer 10 of the blade and remove the damaged core material

[0129] The defect size of the original inner core layer of the blade is 1000mm*500mm. The minimum damage area is marked according to the defect size, and a repair through hole 16 is formed on the second blade layer 12 to remove the damaged core material to form a damage removal hole 15;

[0130] S2: Select the appropriate size and reinforcement combination of the repair core according to the defect size and the type of the original inner core material.

[0131] The original inner core layer 10 in this area is a PVC structural core material, and reinforced PVC is selected as the repair core member;

[0132] The size of a single repair core: length 990 ~ 1000mm, width 95 ~ 100mm;

[0133] The number of repair core parts is 5 in total;

[0134] PVC reinforcement methods such as Fig. 9 As shown, before use, the biaxial 600 glass fiber cloth 62 is soaked with epoxy resin 41 (Daosheng 180 / 185), and the surface fully absorbs the resin. The PVC core material 61 is placed on the biaxial 600 glass fiber cloth 62 filled with epoxy resin, stacked in sequence, and covered with a release cloth 43 on the surface for curing. Before use, the reinforced PVC is cut into the size of the repair core according to the required size, and it is ensured that there is at least one biaxial 600 reinforced glass fiber reinforced plastic inside a single repair core.

[0135] S3: Apply glue and repair core parts

[0136] Fill the damage removal hole 15 with epoxy repair colloid, using a two-component glue gun and a static mixing head, with a colloid thickness of 6 to 8 mm; remove the four pieces of reinforced PVC surface release cloth 43 and place them one by one on the colloid surface. Press the reinforced PVC to the same height as the adjacent original inner core layer 10, and fill the space between the repair core 14 and the damage removal hole 15 and the inner surface of the first blade layer 11, as well as the surface of the repair core 14 with the colloid, and remove the excess epoxy colloid.

[0137] S4: Restore the structure layer

[0138] After the reinforced PVC is filled, epoxy colloid is coated on the entire surface and epoxy colloid is coated on the repair through hole, and the material structure of the prefabricated second blade layer 12 is placed on the repair through hole 16 to obtain a recovery structure layer 17;

[0139] A layer of vacuum bag is arranged on the surface of the prefabricated second blade layer 12 for tightening.

[0140] S5: Heating and curing

[0141] The curing procedure is to cure at 35°C for 1 hour; or cover with an electric blanket and heat at 70°C for 0.5 hour.

[0142] In summary, the present invention proposes a wind turbine blade and a rapid repair method for a wind turbine blade, using a two-component colloid that can be cured at room temperature and a prefabricated reinforced repair core to quickly complete the bonding repair of the damaged area. The method overcomes the impact caused by the harsh conditions of the wind farm, and can achieve a short repair time for wind turbine blades, simple operation, reliable repair quality, and excellent repair structure performance, while reducing repair costs.

[0143] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A wind turbine blade, comprising a first blade layer (11), an original inner core layer (10) and a second blade layer (12) which are stacked, characterized in that: The second blade layer (12) is provided with a repair through hole (16), the original inner core layer (10) is provided with a damage removal hole (15), and the damage removal hole (15) is connected to the repair through hole (16) and extends to the inner surface of the second blade layer (12); A recovery structure layer (17) connected to the second blade layer (12) is provided at the repair through hole (16); One or more repair cores (14) are arranged in the damage removal hole (15), and the one or more repair cores (14) and the repair cores (14) and the first blade layer (11) are connected by continuous colloid filling and curing to form a repair inner core layer (13).

2. The wind turbine blade according to claim 1, characterized in that: The repair core (14) is obtained by preforming a composite of a reinforcing material and a core material; The recovery structure layer (17) is obtained by wet hand lay-up, vacuum infusion or prefabrication.

3. The wind turbine blade according to claim 1, characterized in that: The core material is one of balsa wood core material, PVC foam core material, PET foam core material, PU foam core material, PP foam core material, PA foam core material or paulownia wood core material.

4. The wind turbine blade according to claim 1, characterized in that: The reinforcing material is a resin, or a composite material of a resin and a fiber; wherein the resin is selected from at least one of epoxy resin, polyurethane resin, unsaturated polyester resin, vinyl resin or nylon resin, and the fiber is selected from at least one of glass fiber, carbon fiber, polyester fiber, aramid fiber, boron fiber, polyparaphenylene benzobisazole fiber or basalt fiber.

5. The wind turbine blade according to claim 1, characterized in that: The molding method of the repair core (14) is one of immersion curing molding, wet hand lay-up molding, prepreg molding, vacuum introduction molding, winding molding, injection molding, RTM molding or pultrusion molding.

6. The wind turbine blade according to claim 1, characterized in that: The dimensions of the repair core (14) include: a length of 10 to 1000 mm; a width of 10 to 200 mm; and a thickness that is 0.5 to 6 mm smaller than the thickness of the inner core in the original inner core layer (10).

7. The wind turbine blade according to claim 1, characterized in that: The colloid is one of epoxy system colloid, acrylic system colloid, polyurethane system colloid or organic silica gel system colloid, and the curing temperature is 15-35°C.

8. The wind turbine blade according to claim 7, characterized in that: The thickness of the colloid after solidification is 0.5-6 mm.

9. A method for quickly repairing a wind turbine blade, the wind turbine blade comprising a stacked second blade layer (12), an original inner core layer (10) having a blade inner core defect, and a first blade layer (11), characterized in that: The method comprises the following steps: Determine the damaged area of ​​the blade inner core, remove the corresponding area structures on the second blade layer (12) and the original inner core layer (10) in sequence, form a repair through hole (16) on the second blade layer (12), and form a damage removal hole (15) on the original inner core layer (10); Coating a colloid in the damage removal hole (15), then arranging a repair core (14) or arranging a plurality of repair cores (14) in parallel on the colloid, and allowing the colloid to fill the space between the repair core (14) and the damage removal hole (15) and the inner surface of the first blade layer (11), as well as between the plurality of repair cores (14); Wet hand-laying or bonding the prefabricated glass fiber reinforced plastic plate on the surface of the repair core (14) and the repair through hole (16) to obtain a restored structural layer (17); Maintain vacuum pressure, cure at room temperature or heat the surface to complete the repair of the damaged blade structure.

10. A method for quickly repairing a wind turbine blade, the wind turbine blade comprising a stacked second blade layer (12), an original inner core layer (10) having a blade inner core defect, and a first blade layer (11), characterized in that: The method comprises the following steps: Determine the damaged area of ​​the blade inner core, remove the corresponding area structures on the second blade layer (12) and the original inner core layer (10) in sequence, form a repair through hole (16) on the second blade layer (12), and form a damage removal hole (15) on the original inner core layer (10); Coating a colloid in the damage removal hole (15), then arranging a repair core (14) or arranging a plurality of repair cores (14) in parallel on the colloid, and allowing the colloid to fill the space between the repair core (14) and the damage removal hole (15) and the inner surface of the first blade layer (11), as well as between the plurality of repair cores (14); Maintain vacuum pressure, cure at room temperature or surface heating; On the surface of the repair core (14) and the repair through hole (16), a wet hand paste is used to vacuum infuse or bond the prefabricated glass fiber reinforced plastic plate to obtain a restored structural layer (17); While maintaining vacuum pressure, the surface is heated and solidified to complete the repair of the damaged blade structure.

11. The method for rapid maintenance of wind turbine blades according to claim 10, characterized in that: Room temperature curing includes: The damage removal hole (15) is placed under vacuum pressure and cured at 15-35°C for 1 hour; the heat curing includes: the damage removal hole (15) is placed under vacuum pressure and heated and cured at 70-80°C for 0.5 hour.

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