A planar infiltration type wind power blade pouring system and a pouring method thereof

Abstract

This application discloses a planar permeation wind turbine blade infusion system and method for vacuum infusion molding of wind turbine blade shell layers. The system includes an infusion channel, a guide net, a separator membrane, and a vacuum extraction unit. The bottom surface of the infusion channel is a continuous closed surface, with gradient-diameter infusion holes on the sidewalls. The hole diameter and spacing gradually decrease from the injection end to the far end, preventing direct resin seepage from the bottom surface and allowing the resin to flow out evenly through the sidewall holes. The guide net is connected to the infusion channel and has a gradient-pore structure of permeation holes to guide the resin to diffuse and permeate evenly in a planar direction. The separator membrane is located at the bottom of the guide net and further homogenizes the resin through the flow hole group before wetting the shell layers downwards. The vacuum extraction unit is arranged along the edge of the layers to create a negative pressure environment, achieving a resin "planar diffusion followed by vertical permeation" infusion mode. This ensures a flush infusion front, reduces resin accumulation and insufficient wetting, and improves the infusion quality of the wind turbine blade.

Description

Technical Field

[0001] This application relates to the field of wind turbine blade grouting technology, and more specifically, to a planar permeation wind turbine blade grouting system and grouting method thereof. Background Technology

[0002] Wind turbine blades are an important component of wind turbine generators. The components and skin grouting system of wind turbine blades generally consist of a guide net, grouting channels, and injection ports on the channels. The resin outlet is directly connected to the injection port on the channel. Under the action of vacuum negative pressure, the resin first fills the entire grouting channel, then disperses on the guide net, and the guide net spreads the resin planarly on the shell material.

[0003] Currently, wind turbine blade grouting mostly uses axial grouting channels. As the maximum chord length of the blades becomes wider, the number of axial grouting channels also gradually increases. This results in an excessive number of grouting ports that are scattered in location. Consequently, during the grouting process, issues such as untimely or inconsistent opening sequences of the grouting ports can easily occur, leading to quality problems in the finished grouting blades. Furthermore, the bottom of the grouting channel is open, causing the grouting resin to penetrate in the thickness direction first after entering the channel, resulting in uneven resin penetration and causing quality problems in the finished product.

[0004] In conclusion, improving the quality of finished wind turbine blade injection products is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a planar infiltration wind turbine blade grouting system and grouting method to improve the quality of the finished wind turbine blade grouting product.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A planar infiltration wind turbine blade infusion system is used for vacuum infusion molding of wind turbine blade shell layers. The system includes: an infusion channel equipped with a resin injection port for introducing resin; a cavity with a continuously closed bottom surface formed within the infusion channel; and an infusion hole group formed on the sidewall of the infusion channel. The diameter of each individual infusion hole in the infusion hole group gradually decreases from the resin injection end to the distal end of the infusion channel, and the spacing between adjacent infusion holes in the infusion hole group also gradually decreases from the resin injection end to the distal end of the infusion channel. The following components are included: a flow guide net located at the bottom of the infusion channel and connected to the infusion channel; a permeation hole group formed on the flow guide net, the permeation hole group having a gradient pore structure, so that the flow guide net guides the resin to diffuse along the plane of the flow guide net and permeate uniformly from the permeation hole group; a separation membrane located at the bottom of the flow guide net and laid on top of the shell layer, the separation membrane having a flow hole group formed on the separation membrane; and a vacuum pumping unit distributed along the edge of the shell layer and used to create a negative pressure environment.

[0008] In some embodiments, the diameter of the injection hole at the injection end in the injection hole group is 0.8mm-1.2mm, and the diameter of the injection hole away from the injection end in the injection hole group is 0.5mm-0.8mm; the hole spacing between adjacent injection holes in the injection hole group gradually decreases from 50mm to 30mm from the injection end of the injection channel to the far end.

[0009] In some embodiments, the infusion channel is snapped into the guide net, and the infusion channel and the guide net are bonded together by vacuum sealant.

[0010] In some embodiments, the infusion channel is a flexible channel, and the length of the infusion channel is 6m-20m; the infusion channel is made of a flexible material with vacuum pressure resistance.

[0011] In some embodiments, the flow guiding network is a single structure formed by hot-pressing a flow guiding diffusion layer and a basic flow guiding layer distributed from top to bottom. A first permeation pore group is formed on the flow guiding diffusion layer, and a second permeation pore group is formed on the basic flow guiding layer.

[0012] In some embodiments, along the chord length direction of the wind turbine blade, the porosity of the first permeable pore group gradually decreases from the end near the injection channel to the end away from the injection channel; the porosity of the second permeable pore group is uniformly distributed.

[0013] In some embodiments, the thickness of the flow-guiding diffusion layer is 3 mm, the porosity of the first permeable pore group gradually decreases from 95% to 80% from near the injection channel end to away from the injection channel end, and the pore spacing of the first permeable pore group gradually decreases from 5 mm to 2.5 mm from near the injection channel end to away from the injection channel end; the thickness of the base flow-guiding layer is 2 mm, and the porosity of the second permeable pore group is 80%.

[0014] In some embodiments, the flow guiding mesh further includes a local reinforcing layer, which is hot-pressed together with the flow guiding diffusion layer and the base flow guiding layer; the local reinforcing layer includes narrow-width high-porosity flow guiding strips, which correspond to the tip region of the leading or trailing edge of the shell layer; the width of the narrow-width high-porosity flow guiding strips is 50mm-80mm, and the porosity of the narrow-width high-porosity flow guiding strips is 93%.

[0015] In some embodiments, the vacuum pumping unit includes a semi-permeable membrane pumping pipe, which is composed of a semi-permeable membrane and a pumping pipeline. The semi-permeable membrane pumping pipe is arranged along the edge of the shell layer and connected to the vacuum pump through a T-shaped plastic pipe. The start and end points of the semi-permeable membrane pumping pipe are recessed by 50mm-100mm relative to the start and end points of the edge of the shell layer.

[0016] In some embodiments, the vacuum extraction unit includes an integrated extraction belt or extraction membrane, which has a built-in sealing strip and is directly connected to the vacuum hole of the wind turbine blade mold after being laid. The integrated extraction belt or extraction membrane conforms to the curved surface of the shell layer.

[0017] A method for injecting a planar infiltrated wind turbine blade grouting system, employing the planar infiltrated wind turbine blade grouting system described above, comprising:

[0018] A lower layer of release fabric is laid inside the mold cavity of the wind turbine blade, ensuring that the lower layer of release fabric completely covers the pre-laid fabric layer and that the corners inside the cavity are firmly attached without wrinkles or gaps. On the lower layer of release fabric, according to the structural layer design, the core material, fiberglass, and preform are laid sequentially, and the start and end points are checked; if there are deviations, the corresponding preforms are adjusted. After completing the structural layer laying, an upper layer of release fabric is laid, adjusting its axial position and chordal width on both sides to completely cover the structural layer, ensuring that the corners inside the cavity are firmly attached without wrinkles or gaps. The release membrane and the flow guide net are laid on top of the upper layer of release fabric. The injection channel is laid on the flow guide net. Above, the guide net extends 50mm-100mm beyond the edge of the injection channel in the width direction, and the spacing between adjacent injection channels is 500mm-10000mm; the vacuum extraction unit is arranged along the edge of the shell layer and connected to the vacuum extraction hole, the spacing between the vacuum extraction holes is 100mm-2000mm; after a negative pressure environment is formed, resin is introduced into the injection channel through the injection port, so that the resin enters the guide net through the injection hole group on the side wall of the injection channel, and diffuses along the plane of the guide net, and then evenly penetrates downward into the shell layer through the flow hole group of the isolation membrane to complete the impregnation.

[0019] The planar infiltration wind turbine blade infusion system provided in this application is used for vacuum infusion molding of wind turbine blade shell layers. It includes an infusion channel, a guide net, a separator, and a vacuum pumping unit. The infusion channel is equipped with an injection port to introduce resin, forming a cavity with a continuously closed bottom surface within the channel. An infusion hole group is formed on the sidewall of the infusion channel. The diameter of each individual infusion hole in the group gradually decreases from the injection end of the infusion channel to the distal end, and the spacing between adjacent infusion holes in the group gradually decreases from the distance between the injection ends of the infusion channel. The resin gradually decreases in size from the injection end to the distal end, allowing the resin to be introduced into the injection channel through the injection port. Since the bottom surface of the injection channel has a closed structure, it prevents the resin from directly penetrating downwards from the bottom surface of the injection channel. Instead, the resin flows out through a gradient injection hole group opened on the side wall of the injection channel to compensate for the change in resin flow rate caused by the decrease in vacuum negative pressure along the length of the injection channel. This results in the resin first flowing along the injection channel and being discharged from the injection hole group on the side wall, reducing the uneven penetration caused by the resin penetrating downwards first.

[0020] The guide net is located at the bottom of the injection channel and is connected to the injection channel, allowing resin to be guided through the injection hole group to the guide net. A permeation hole group is formed on the guide net, and the permeation hole group has a gradient pore structure, so that the guide net can guide the resin to diffuse in the plane of the guide net and permeate evenly from the permeation hole group, thereby improving the uniformity of resin permeation. The variable parameter injection hole group on the side wall of the injection channel works in conjunction with the gradient pore structure of the guide net, replacing multi-point axial delivery with planar diffusion. It can cover the same injection area with fewer injection channels and injection ports, directly reducing the amount of auxiliary materials laid in the cavity, reducing the risk of defects caused by operators stepping on the preform, and simplifying the opening and closing of the tubes during the injection process, reducing human error.

[0021] The separator is located at the bottom of the flow guide and laid on top of the shell layer. A group of flow holes is formed on the separator to further guide the resin to lay in a plane and to introduce it into the shell layer through the group of flow holes to form wetting, thereby further improving the uniformity of penetration.

[0022] The vacuum pumping unit is distributed along the edge of the shell layer and forms the negative pressure environment required for grouting. In this way, during the grouting process, the resin forms a grouting pattern of "first planar diffusion and then vertical penetration", which makes the flow front of the grouting resin more even, reduces local resin accumulation or insufficient wetting caused by uneven grouting, and improves the finished product quality of wind turbine blade grouting. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A schematic cross-sectional view of the infusion channel provided in an embodiment of this application;

[0025] Figure 2 This is a top view schematic diagram of the infusion system provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100-Injection channel;

[0028] 200-Flow Guide Network. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0031] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0032] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0033] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0034] like Figures 1-2As shown in the embodiment of this application, the planar permeation wind turbine blade infusion system is used for vacuum infusion molding of wind turbine blade shell layers. It includes an infusion channel 100, a guide net 200, a separator membrane, and a vacuum pumping unit. The infusion channel 100 is equipped with an injection port to introduce resin, forming a cavity with a continuously closed bottom surface within the infusion channel 100. An infusion hole group is formed on the sidewall of the infusion channel 100. The diameter of each infusion hole in the infusion hole group gradually decreases from the injection end of the infusion channel to the distal end, and the distance between adjacent infusion holes in the infusion hole group increases from the infusion channel 100... The resin gradually decreases in size from the injection end to the distal end, allowing the resin to be introduced into the injection channel 100 through the injection port. Since the bottom surface of the injection channel 100 is a closed structure, it prevents the resin from directly penetrating downwards from the bottom surface of the injection channel 100. Instead, the resin flows out through the gradient injection hole group opened on the side wall of the injection channel 100 to compensate for the change in resin flow rate caused by the decrease in vacuum negative pressure along the length of the injection channel 100. This results in the resin flowing along the injection channel 100 first and being discharged from the injection hole group on the side wall, reducing the uneven penetration caused by the resin penetrating downwards first.

[0035] The guide net 200 is located at the bottom of the injection channel 100 and is connected to the injection channel 100, allowing the resin to be guided to the guide net 200 through the injection hole group. A permeation hole group is formed on the guide net 200, and the permeation hole group has a gradient pore structure, so that the guide net 200 can guide the resin to diffuse in the plane of the guide net 200 and permeate evenly from the permeation hole group, thereby improving the uniformity of resin permeation. The variable parameter injection hole group on the side wall of the injection channel 100 works in conjunction with the gradient pore structure of the guide net 200, replacing multi-point axial delivery with planar diffusion. It can cover the same injection area with fewer injection channels 100 and injection ports, directly reducing the amount of auxiliary materials laid in the cavity, reducing the risk of defects caused by operators stepping on the preform, and simplifying the opening and closing of the tubes during the injection process, reducing human error.

[0036] The separator is located at the bottom of the flow guide net 200 and laid on top of the shell layer. A group of flow holes is formed on the separator to further guide the resin to lay in a plane through the separator and to introduce it into the shell layer through the group of flow holes to form wetting, thereby further improving the uniformity of penetration.

[0037] The vacuum pumping unit is distributed along the edge of the shell layer and forms the negative pressure environment required for grouting. In this way, during the grouting process, the resin forms a grouting pattern of "first planar diffusion and then vertical penetration", which makes the flow front of the grouting resin more even, reduces local resin accumulation or insufficient wetting caused by uneven grouting, and improves the finished product quality of wind turbine blade grouting.

[0038] It should be noted that, such as Figure 1As shown, the cross-section of the injection channel 100 can be as follows: Figure 1 The structure shown can also be circular or other cross-sectional shapes, which can be selected according to the actual situation. This application does not limit this.

[0039] In practice, since the resin flow is driven by vacuum negative pressure, the resin penetration rate gradually decreases as the length of the injection channel 100 decreases. Therefore, in this application, in the injection hole group, the diameter of the injection hole at the injection end is 0.8mm-1.2mm, and the diameter of the injection hole away from the injection end is 0.5mm-0.8mm. Furthermore, the hole spacing between adjacent injection holes in the injection hole group gradually decreases from 50mm to 30mm from the injection end of the injection channel 100 to the far end. This is to ensure that the resin can be uniformly gradient discharged along the injection holes on the side wall during the flow of the resin in the injection channel 100, thereby improving the uniformity of resin discharge and enabling the resin to be uniformly laid in a plane.

[0040] In this application, the injection channel 100 and the guide net 200 are snap-fitted together, and the injection channel 100 and the guide net 200 are bonded together by vacuum sealant to achieve mechanical positioning and bonding fixation of the injection channel 100 and the guide net 200, ensuring the sealing and connection strength between the injection channel 100 and the guide net 200, so as to ensure the stable connection between the injection channel 100 and the guide net 200 during vacuum negative pressure injection, and to ensure the normal diffusion of resin.

[0041] In this application, the injection channel 100 is a flexible channel, which allows the injection channel 100 to bend adaptively with the curved surface structure of the shell ply, adapting to the complex curved surface structure of large blades. The length of a single injection channel 100 is 6m-20m, with a maximum length of 20m, which can significantly reduce the number of injection channels 100 and injection ports, further reducing manual operation and improving blade quality.

[0042] In this application, the injection channel 100 is made of a flexible material with vacuum pressure resistance. During vacuum negative pressure injection, it has good structural strength and can resist external atmospheric pressure, ensuring that the cavity of the injection channel 100 does not collapse or deform, maintaining the smoothness and stability of the channel cross-section, and ensuring that the resin output remains in a balanced state along the length of the channel. At the same time, the injection channel 100 has good flexibility. The injection channel 100 can be flexibly bent and laid according to the actual curvature of the mold cavity, which is especially suitable for areas such as the root and tip of blades with large curvature changes, effectively reducing the difficulty of on-site operation and layout.

[0043] In some embodiments, the injection channel 100 is a high-strength epoxy resin composite material with good structural rigidity, which can ensure the stability of the cavity of the injection channel 100 under negative pressure environment, and has high dimensional accuracy to ensure the accuracy of the gradient aperture, so that the amount of resin discharged along the injection channel 100 can reach the expected balanced state.

[0044] In some other embodiments, the injection channel 100 is made of flexible, heat-resistant rubber with good bendability, which can better adapt to the curved surface of the blade for laying, so that the operator can flexibly arrange it in the mold cavity according to the actual curved surface direction. It can be better applied to areas such as the blade root and blade tip with large curvature changes, reducing the difficulty of operation.

[0045] In some other embodiments, the injection channel 100 can be made of plastic with good compressive strength to maintain the unobstructed cross-section of the channel, thereby making the amount of resin dispensed along the length of the channel basically uniform.

[0046] In this application, the flow guiding net 200 is a one-piece structure formed by hot pressing and combining a flow guiding diffusion layer and a basic flow guiding layer distributed from top to bottom. A first permeation hole group is formed on the flow guiding diffusion layer, and a second permeation hole group is formed on the basic flow guiding layer, so that the resin passes through the flow guiding diffusion layer and the basic flow guiding layer in sequence during the process of being introduced into the flow guiding net 200, so as to further guide the resin to lay in a plane and improve the uniformity of laying.

[0047] As the blade chord length gradually increases, in order to guide the resin to spread rapidly along the chord length direction and form a flat wetting front when the resin is introduced into the guide net 200, in this application, the porosity of the first permeation hole group gradually decreases from one end near the injection channel 100 to the other end far away from the injection channel 100, so as to form a channel that can quickly diffuse to both sides through the high porosity at the near end, so as to guide the resin to spread rapidly. When the resin diffuses to the far end, it needs to gradually slow down by gradually decreasing the porosity to avoid air pockets caused by the front rushing too fast and the subsequent resin not keeping up, so as to further ensure the uniformity of the laying.

[0048] The basic flow guiding layer is located below the flow guiding and diffusion layer and is closely attached to the isolation membrane. The porosity of the second permeation pore group is evenly distributed to allow the resin to permeate downwards uniformly and synchronously. In the thickness direction, the resin can be uniformly wetted throughout, thereby improving the uniformity of the laying.

[0049] Specifically, the thickness of the flow-guiding diffusion layer is 3 mm, and the porosity of the first permeation pore group gradually decreases from 95% to 80% from one end near the injection channel 100 to the other end away from the injection channel 100. The pore spacing of the first permeation pore group gradually decreases from 5 mm to 2.5 mm from one end near the injection channel 100 to the other end away from the injection channel 100. By increasing the pore spacing and reducing the porosity, sufficient permeation channels are ensured per unit area in each region to guarantee the amount of resin supplied downwards, so as to avoid the formation of thin-layer wetting or dry areas and improve the wetting effect.

[0050] Specifically, the thickness of the basic flow guide layer is 2mm, and the porosity of the second permeation pore group is 80%, which allows the resin to simultaneously wet the shell layer from the entire plane at a uniform rate, ultimately achieving a pouring state in which the resin can be pushed downward as a whole, thus improving the pouring quality.

[0051] In actual grouting, the leading and trailing edges of the wind turbine blades are areas where the shell layers gradually narrow and become pointed. During grouting, the resin diffuses from the middle injection end to both sides. When the flow front advances to the pointed area, the flow cross-sectional area shrinks sharply. By the time the resin reaches the pointed tip after a long-distance planar diffusion, the driving force has weakened, making it difficult to continue advancing. To ensure the laying effect in the pointed area, in this application, the flow guiding net 200 also includes a local reinforcement layer. The local reinforcement layer is hot-pressed and composited with the flow guiding diffusion layer and the basic flow guiding layer, reducing the laying process and enabling the local reinforcement layer to accurately locate the areas that need reinforcement, thereby accelerating the reinforcement of local areas and improving the grouting effect.

[0052] The local reinforcement layer includes narrow-width, high-porosity guide strips, which correspond to the tip areas of the leading or trailing edges of the shell ply. The width of the narrow-width, high-porosity guide strips is 50mm-80mm, and the porosity of the narrow-width, high-porosity guide strips is 93%. By setting narrow-width, high-porosity guide strips, while maintaining the overall gradient diffusion function of the guide net 200, the problem of resin difficulty in reaching the leading and trailing edge tip areas of the blade due to high flow resistance and long path is specifically solved. This improves the resin filling rate in the tip area and eliminates the potential quality problems of the finished blade caused by local glue deficiency. At the same time, the integrated hot-press composite molding design allows the entire guide net 200 to provide differentiated flow guidance capabilities while remaining a complete and independent component, making it easy to lay and accurately position.

[0053] In some embodiments, the vacuum pumping unit includes a semi-permeable membrane pumping pipe, which is composed of a semi-permeable membrane and a pumping pipeline. The semi-permeable membrane pumping pipe is arranged along the edge of the shell ply and connected to the vacuum pump through a T-junction plastic pipe. The start and end points of the semi-permeable membrane pumping pipe are recessed by 50mm-100mm relative to the start and end points of the edge of the shell ply. The semi-permeable membrane is characterized by the fact that gas can pass through but resin cannot, so that when the resin injection front is pushed to the edge of the pumping side, the semi-permeable membrane can prevent the resin from being sucked into the pumping pipeline and the vacuum pump, thus ensuring that the resin is in the cavity. The integrated composite structure reduces the laying process, and the arrangement along the entire length of the edge ensures uniform pumping in the cavity. The recessed start and end points prevent excessive suction at the edge, protect the ply ends, and simplify the structure of the vacuum pumping unit.

[0054] In other embodiments, the vacuum pumping unit includes an integrated pumping strip or pumping membrane with its own sealing strip. After being laid, it is directly connected to the vacuum hole of the wind turbine blade mold. The integrated pumping strip or pumping membrane conforms to the curved surface of the shell layer. Through the three core features of having its own sealing strip, directly connecting to the mold vacuum hole, and conforming to the curved surface, the overall structure of the vacuum pumping unit is integrated and simplified. This simplifies the laying process, reduces the number of operation steps in the cavity and the risk of stepping on the preform, eliminates local air leakage caused by non-fitting, and shortens the pumping path and reduces vacuum loss. A more efficient and uniform pumping is achieved with a simpler system.

[0055] It should be noted that in practice, the vacuum pumping unit can also replace the integrated pumping belt or pumping membrane with a porous silicone pumping pad to simplify the structure in the same way. The pumping holes can be a combination of the vacuum holes provided by the mold and a mobile vacuum pump. As long as the pumping spacing and vacuum uniformity are ensured, this application does not limit this.

[0056] This application also provides a grouting method for a planar infiltration wind turbine blade grouting system, which uses the planar infiltration wind turbine blade grouting system described in the above embodiments.

[0057] The grouting method for a planar infiltration wind turbine blade grouting system provided in this application specifically includes:

[0058] S100. Lay the lower layer of release cloth inside the mold cavity of the wind turbine blade, so that the lower layer of release cloth completely covers the pre-laid cloth layer, and ensure that the corners inside the cavity are firmly attached, without wrinkles or gaps. The release cloth is laid between the surface of the mold cavity and the shell layer. After curing, the finished blade can be easily separated from the mold without sticking or leaving any residue.

[0059] S200. On the lower release fabric, according to the structural layer design, the core material, fiberglass and preform are laid in sequence, and the starting and ending points are checked. If there is a deviation, the corresponding preform is adjusted. The core material provides the thickness and rigidity of the sandwich structure, the fiberglass provides the strength and fatigue resistance of the skin, and the preform achieves local reinforcement. The materials are laid in sequence to form a complete structural system of the blade shell. Position deviations are found and corrected during the laying stage to avoid the deviations accumulating until they are discovered after pouring and curing, thereby avoiding irreversible quality loss or scrap.

[0060] S300 After the structural layup is completed, the upper release cloth is laid, and its axial position and chord width on both sides are adjusted so that it completely covers the structural layup. Ensure that the corners inside the cavity are firmly attached, without wrinkles or gaps. The upper release cloth covers the core material, fiberglass and preform, separating the structural layup from the upper guide net and isolation membrane. After curing, the auxiliary materials can be completely peeled off, and the inner surface of the blade is smooth.

[0061] S400. The release membrane and flow guide net 200 are laid on top of the upper release cloth. The flow guide net and the release membrane together form a medium layer for resin planar diffusion and uniform penetration. After laying, the core flow control component of the injection system is in place, providing a foundation for the subsequent laying of injection channels and uniform distribution of resin.

[0062] It should be noted that the release membrane is laid first, making it adhere tightly to the upper release cloth, and then the flow guide net 200 is laid on top of the release membrane. This ensures the correctness of the resin's penetration path from top to bottom along the flow guide net, release membrane, and shell layers.

[0063] S500, the injection channel 100 is laid on top of the guide net 200, and the guide net 200 extends 50mm-100mm beyond the edge of the injection channel 100 in the width direction. The spacing between adjacent injection channels 100 is 500mm-10000mm, so that resin can be introduced through the injection channel 100. The guide net 200 extends a certain distance beyond the injection channel 100 to ensure that there is enough guide net 200 width on both sides of the injection channel 100 to receive the resin flowing out from the side wall hole and diffuse it laterally to both sides.

[0064] It should be noted that the spacing between adjacent injection channels 100 can be adjusted appropriately according to the actual situation, and this application embodiment does not limit this.

[0065] S600. The vacuum pumping unit is arranged along the edge of the shell layer and connected to the vacuum pumping hole. The spacing of the vacuum pumping hole is 100mm-2000mm, so that the negative pressure is applied evenly from the periphery of the injection area. The resin is subjected to uniform vacuum attraction in all directions during the planar diffusion process, and the flow front advances horizontally.

[0066] In practice, the density of the extraction pores can be adjusted according to the thickness of the layer and the permeability, but this application does not limit this.

[0067] S700: After a negative pressure environment is formed, resin is introduced into the injection channel 100 through the injection port. The resin enters the guide net 200 through the injection hole group on the side wall of the injection channel 100, and diffuses along the plane of the guide net 200. Then, it permeates evenly downwards through the flow hole group of the isolation membrane to the shell layer, completing the impregnation. The flow path of the resin is along the injection channel 100, the side wall injection hole group, the guide net 200, the flow hole group of the isolation membrane, and to the shell layer, forming an injection mode of "planar diffusion first, then vertical penetration". This reduces problems such as uneven penetration and air pockets caused by vertical penetration first. It allows the resin to penetrate downwards evenly and synchronously after planar laying, improving the uniformity of penetration, increasing injection efficiency, and improving the finished product quality of wind turbine blade injection.

[0068] The above description of the embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A planar infiltration-type wind turbine blade infusion system, used for vacuum infusion molding of wind turbine blade shell layers, characterized in that, include: A filling channel (100) is provided with a glue inlet for introducing resin. The filling channel (100) forms a cavity with a continuously closed bottom surface. A group of filling holes is provided on the side wall of the filling channel (100). The diameter of a single filling hole in the group of filling holes gradually decreases from the glue injection end of the filling channel (100) to the far end. The hole spacing between adjacent filling holes in the group of filling holes gradually decreases from the glue injection end of the filling channel (100) to the far end. A flow guide net (200) is located at the bottom of the infusion channel (100) and is connected to the infusion channel (100). A group of permeable holes is formed on the flow guide net (200). The permeable hole group has a gradient pore structure so that the flow guide net (200) guides the resin to diffuse along the plane of the flow guide net (200) and permeate uniformly from the permeable hole group. An isolation membrane is located at the bottom of the flow guide net and laid on top of the shell layer, and a group of flow holes is formed on the isolation membrane; A vacuum pumping unit is distributed along the edge of the shell layer and is used to create a negative pressure environment.

2. The planar infiltration wind turbine blade injection system according to claim 1, characterized in that, The diameter of the injection hole at the injection end in the injection hole group is 0.8mm-1.2mm, and the diameter of the injection hole away from the injection end in the injection hole group is 0.5mm-0.8mm. The spacing between adjacent injection holes in the injection hole group gradually decreases from 50mm to 30mm from the injection end of the injection channel to the far end.

3. The planar infiltration wind turbine blade injection system according to claim 1, characterized in that, The injection channel (100) is engaged with the guide net (200), and the injection channel (100) and the guide net (200) are bonded together by vacuum sealant.

4. The planar infiltration wind turbine blade injection system according to claim 1, characterized in that, The infusion channel (100) is a flexible channel, and the length of the infusion channel (100) is 6m-20m; The infusion channel (100) is made of a flexible material with vacuum pressure resistance.

5. The planar infiltration wind turbine blade injection system according to claim 1, characterized in that, The flow guiding net (200) is a structure formed by hot-pressing and combining a flow guiding diffusion layer and a basic flow guiding layer distributed from top to bottom. A first permeation hole group is formed on the flow guiding diffusion layer, and a second permeation hole group is formed on the basic flow guiding layer.

6. The planar infiltration wind turbine blade injection system according to claim 5, characterized in that, Along the chord length direction of the wind turbine blade, the porosity of the first permeable pore group gradually decreases from the end near the injection channel to the end away from the injection channel. The porosity of the second permeable pore group is uniformly distributed.

7. The planar infiltration wind turbine blade injection system according to claim 6, characterized in that, The thickness of the flow-guiding diffusion layer is 3 mm. The porosity of the first permeable pore group gradually decreases from 95% to 80% from the end near the injection channel to the end away from the injection channel. The pore spacing of the first permeable pore group gradually decreases from 5 mm to 2.5 mm from the end near the injection channel to the end away from the injection channel. The thickness of the basic flow guiding layer is 2 mm, and the porosity of the second permeable pore group is 80%.

8. The planar infiltration wind turbine blade injection system according to claim 5, characterized in that, The flow guiding net (200) also includes a local reinforcing layer, which is hot-pressed together with the flow guiding diffusion layer and the basic flow guiding layer; The local reinforcement layer includes narrow, high-porosity guide strips, which correspond to the tip region of the leading or trailing edge of the shell layup; The width of the narrow-width high-porosity guide strip is 50mm-80mm, and the porosity of the narrow-width high-porosity guide strip is 93%.

9. The planar infiltration wind turbine blade injection system according to claim 1, characterized in that, The vacuum pumping unit includes a semi-permeable membrane pumping pipe, which is composed of a semi-permeable membrane and a pumping pipeline. The semi-permeable membrane pumping pipe is arranged along the edge of the shell layer and is connected to the vacuum pump through a three-way plastic pipe. The start and end points of the semi-permeable membrane extraction tube are recessed 50mm-100mm relative to the start and end points of the edge of the shell layer.

10. The planar infiltration wind turbine blade injection system according to claim 1, characterized in that, The vacuum pumping unit includes an integrated pumping belt or pumping membrane, which has its own sealing strip. After being laid, it is directly connected to the vacuum hole of the wind turbine blade mold. The integrated pumping belt or pumping membrane conforms to the curved surface of the shell layer.

11. A method for injecting a planar infiltration wind turbine blade grouting system, employing the planar infiltration wind turbine blade grouting system as described in any one of claims 1-10, characterized in that, include: A lower layer of release cloth is laid inside the mold cavity of the wind turbine blade, so that the lower layer of release cloth completely covers the pre-laid cloth layer, and ensures that the corners inside the cavity are firmly attached, without wrinkles or gaps. On the lower release fabric, according to the structural fabric layer design, the core material, glass fiber and preform are laid in sequence, and the start and end points are checked. If there is a deviation, the corresponding preform is adjusted. After the structural layup is completed, the upper release fabric is laid, and its axial position and chord width on both sides are adjusted so that it completely covers the structural layup, and ensures that the corners inside the cavity are firmly attached, without wrinkles or gaps. The isolation membrane and the flow guide net (200) are laid on top of the upper release cloth; The infusion channel is laid on top of the guide net (200), and the guide net (200) extends 50mm-100mm beyond the edge of the infusion channel (100) in the width direction, and the spacing between adjacent infusion channels (100) is 500mm-10000mm; The vacuum pumping unit is arranged along the edge of the shell layer and connected to the vacuum pumping holes, the spacing of which is 100mm-2000mm. After a negative pressure environment is formed, resin is introduced into the injection channel (100) through the injection port, so that the resin enters the guide net (200) through the injection hole group on the side wall of the injection channel (100), and after spreading along the plane of the guide net (200), it permeates evenly downwards to the shell layer through the flow hole group of the isolation membrane to complete the impregnation.

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