Wind turbine blade vacuum infusion flow guiding and isolating assembly

Abstract

The application discloses a wind power generation blade vacuum infusion flow guide isolation assembly, wherein the wind power generation blade vacuum infusion flow guide isolation assembly comprises an isolation film and a flow guide net, the flow guide net is arranged on the isolation film, a temperature-sensitive color-changing layer is arranged on the flow guide net and / or the isolation film, the temperature-sensitive color-changing layer is configured to change color under the change of temperature, is used for monitoring local temperature abnormity in a wind power generation blade vacuum infusion process, and when the temperature of the temperature-sensitive color-changing layer covering area exceeds a preset threshold value, the temperature-sensitive color-changing layer changes from a first color to a second color, and the first color and the second color are different. The technical scheme provided by the application can provide real-time and visual temperature monitoring means when the blade is heated and solidified or maintained and heated by arranging the temperature-sensitive color-changing layer on the flow guide net and / or the isolation film.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a vacuum injection flow guiding and isolation component for wind turbine blades. Background Technology

[0002] Vacuum infusion is a commonly used composite material molding method in the manufacturing process of wind turbine blades. This process involves injecting resin into pre-laid fiber-reinforced materials and curing it in a vacuum environment to ultimately form a high-strength composite material structure.

[0003] However, during the vacuum infusion and curing process, the exothermic reaction of the resin may cause localized excessively high temperatures. Traditional temperature monitoring methods (such as thermocouples or infrared thermometry) can usually only achieve "point" or "line" monitoring, which is difficult to cover the entire surface of the wind turbine blade and has monitoring blind spots. As a result, there are still high quality risks and production costs in the manufacturing process of wind turbine blades. Utility Model Content

[0004] The purpose of this application is to provide a vacuum injection flow guiding and isolation component for wind turbine blades, which can monitor local temperature anomalies during the vacuum injection process of wind turbine blades.

[0005] This utility model provides a vacuum injection flow guiding and isolation component for wind turbine blades, comprising: Separating membrane; A flow guide net is applied to the isolation membrane, and the flow guide net and / or the isolation membrane are provided with a temperature-sensitive color-changing layer; The thermochromic layer is configured to change color in response to temperature changes, and is used to monitor local temperature anomalies during the vacuum injection process of wind turbine blades. When the temperature in the area covered by the thermochromic layer exceeds a preset threshold, the thermochromic layer changes from a first color to a second color, and the first color and the second color are different.

[0006] Beneficial effects: This wind turbine blade vacuum-injection flow-guiding and isolation assembly involves laying an isolation membrane on the blade body material during the vacuum injection process, followed by laying a flow-guiding mesh on the isolation membrane. The resin diffuses rapidly and evenly to all areas of the blade mold through the pores and channels of the flow-guiding mesh, ensuring the composite material is fully impregnated. The isolation mesh prevents the flow-guiding mesh from adhering to the cured resin (facilitating later peeling) and ensures product surface quality.

[0007] By installing a thermosensitive color-changing layer on the airflow guide net and / or isolation membrane, real-time and visual temperature monitoring can be provided during blade heating and curing or maintenance heating. The thermosensitive color-changing layer can cover the entire blade or a portion of it, allowing the covered area to monitor localized temperature anomalies during the vacuum filling process when the airflow guide net and isolation membrane are attached to the wind turbine blade surface. Once the surface temperature of the covered area exceeds a preset threshold, the color changes from the first color to the second color (e.g., from light to dark), allowing operators to visually observe the color-changing area. This enables comprehensive and real-time temperature monitoring of the wind turbine blade surface, preventing localized overheating issues from being overlooked due to monitoring blind spots.

[0008] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This flow-guiding and isolation component can quickly respond to temperature changes. When the local temperature abnormally rises above a preset threshold, the area covered by the temperature-sensitive color-changing layer immediately changes color, promptly alerting operators. It can detect localized temperature anomalies in a timely manner, allowing operators to intervene promptly, effectively avoiding quality problems caused by localized overheating, reducing the defect rate of wind turbine blades, improving product quality, and ensuring the reliability and stability of wind turbine blades in actual operation.

[0009] Meanwhile, temperature monitoring using this airflow isolation component eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the wind turbine blades simply by observing the color changes of the isolation membrane and the airflow guide net. Compared to traditional monitoring methods that require wiring for thermocouples or specialized equipment and calibration maintenance for infrared thermometry, this airflow isolation component simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0010] In one optional implementation, the preset threshold is any temperature value within the range of 40℃ to 100℃.

[0011] Beneficial effects: The exothermic peak and curing temperature of the resin used for wind turbine blade infusion vary. The wide range of 40℃-100℃ can flexibly match the temperature warning requirements of different resin types, wind turbine blade specifications and production processes, ensuring that the temperature-sensitive color-changing layer can accurately respond to the critical temperature in specific scenarios.

[0012] In one optional embodiment, both the flow guide net and the isolation membrane are provided with a temperature-sensitive color-changing layer.

[0013] Beneficial effects: The flow guide net directly contacts the resin flow path, and the temperature-sensitive color-changing layer on the flow guide net can reflect local temperature changes in real time during the resin flow process; the isolation membrane is close to the main blade material, and the temperature-sensitive color-changing layer on the isolation membrane can monitor the temperature distribution in the core area of ​​the curing reaction. The combination of the two can capture anomalies from both the flow path and the core curing area, avoiding the omission of a single monitoring point and ensuring no temperature blind spots.

[0014] In one optional embodiment, the thermochromic layer is a reversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer decreases from a state exceeding the preset threshold to a state below the preset threshold, the color of the area covered by the thermochromic layer changes from the second color to the first color.

[0015] Beneficial Effects: In the production of wind turbine blades, resin curing is a dynamic process with constantly changing temperatures. The reversible thermochromic layer can track temperature changes in real time. When the temperature of the area covered by the thermochromic layer exceeds a preset threshold, the color changes from the first color to the second color, alerting operators to an abnormal temperature. When the temperature returns to normal, the color changes back to the first color. This allows operators to continuously monitor temperature fluctuations and promptly identify potential problems. In the early stages of resin curing, due to the intense chemical reaction, local temperatures may fluctuate frequently. The reversible color-changing characteristic allows operators to monitor the temperature at any time, ensuring the entire curing process is conducted within a suitable temperature range. If an abnormal temperature is detected during production, operators can take measures to cool down the area. Once the temperature returns to normal, the reversible thermochromic layer will return to its first color, allowing subsequent operations to continue without waiting for the entire production process to end for inspection and adjustment. This avoids production interruptions and delays caused by temperature issues, improving production efficiency.

[0016] In one optional embodiment, the thermochromic layer is an irreversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer decreases from a state exceeding the preset threshold to a state below the preset threshold, the color of the area covered by the thermochromic layer remains the second color.

[0017] Beneficial effects: The irreversible color-changing layer accurately records situations where the temperature exceeds a preset threshold. Regardless of subsequent temperature changes, the color-changing area retains its second color, providing a direct and tamper-proof record of temperature anomalies for the production process. This helps operators clearly understand which parts of the wind turbine blades have experienced temperature problems, as well as the approximate severity and scope of the problems, during subsequent quality inspection and analysis, facilitating the tracing and investigation of potential quality hazards.

[0018] In one optional embodiment, the thermosensitive color-changing layer is disposed on the outer surface of the flow guide mesh and / or the outer surface of the isolation membrane.

[0019] Beneficial effects: By placing the thermochromic layer on the outer surface of the flow guide mesh and / or the isolation membrane, the thermochromic layer is directly exposed to the visible range. Operators can quickly observe the color change with the naked eye without disassembling or touching the inside of the component, and can detect temperature anomalies in the first instance. At the same time, the heat exchange between the outer surface and the environment is more direct, and the response to temperature fluctuations is more sensitive, which can shorten the early warning delay time and provide a more sufficient window for timely intervention.

[0020] In one optional embodiment, the thermosensitive color-changing layer is applied to the outer surface of the flow guide mesh and / or the outer surface of the isolation membrane by spraying, printing or hot pressing.

[0021] Beneficial effects: Spray coating is suitable for complex curved surfaces or mesh structures (such as the mesh gaps of a flow guide), and can evenly cover irregular surfaces with atomized paint, ensuring no dead corners in the thermochromic layer. Printing is suitable for flat or regularly textured release film surfaces, allowing precise control of the pattern and thickness of the thermochromic layer and avoiding material waste. Hot-press bonding combines the pre-made thermochromic film with the flow guide or release film under high temperature and pressure, suitable for scenarios requiring high adhesion, and does not affect the original performance of the flow guide or release film due to solvents.

[0022] In one alternative embodiment, the flow-guiding isolation component further includes a protective layer covering the outer surface of the thermochromic layer.

[0023] Beneficial effects: By setting a protective layer on the outer surface of the thermochromic layer, direct contact between the thermochromic layer and external substances such as resin and solvent can be isolated, avoiding failure of the color-changing material due to chemical corrosion (such as active ingredients in resin), physical friction (such as pressure extrusion during vacuum infusion), or high-temperature aging. This ensures that the thermochromic layer maintains a sensitive response to temperature throughout the entire infusion and curing process, reducing monitoring failures caused by damage to the thermochromic layer.

[0024] In one alternative embodiment, the thermosensitive color-changing layer is disposed inside the flow guide mesh and / or inside the isolation membrane.

[0025] Beneficial effects: The internally designed thermochromic layer can be encapsulated by the mesh structure of the flow guide or the substrate of the separator, reducing direct contact with the external environment (such as resin, solvent, and mechanical friction), and lowering the risk of failure due to chemical corrosion and physical wear. For example, the thermochromic layer inside the flow guide will not be washed away by the flowing resin, and the thermochromic layer inside the separator can also avoid being squeezed and damaged under vacuum negative pressure, ensuring a stable response to temperature changes throughout the entire process cycle.

[0026] In one optional embodiment, the thermosensitive color-changing layer is disposed inside the flow guiding mesh and / or the isolation membrane via a multi-layer co-extrusion process. Beneficial effects: The multi-layer co-extrusion process, by co-extruding and compounding the thermosensitive color-changing layer material with the substrate of the flow guiding mesh / isolation membrane in a molten state, forms a tight intermolecular bond between the thermosensitive color-changing layer and the substrate of the flow guiding mesh / isolation membrane, rather than a physical connection achieved through later bonding. This prevents the thermosensitive color-changing layer from detaching during use due to resin erosion, mechanical stress, or temperature changes, ensuring its stable temperature monitoring function during core operations such as flow guiding and isolation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of a vacuum injection flow-guiding isolation assembly for wind turbine blades according to one embodiment provided in this application; Figure 2 This is a cross-sectional view of a vacuum injection flow-guiding isolation assembly for wind turbine blades in another embodiment provided in this application; Figure 3 This is a cross-sectional view of a vacuum injection flow-guiding isolation assembly for wind turbine blades in another embodiment provided in this application.

[0029] Explanation of reference numerals in the attached figures: 100. Separating membrane; 200. Traffic diversion network; 300, Thermochromic layer; 400. Protective layer. Detailed Implementation

[0030] In related technologies, the exothermic reaction of the resin during vacuum infusion and curing may cause localized excessively high temperatures. Traditional temperature monitoring methods (such as thermocouples or infrared thermometry) can usually only achieve "point" or "line" monitoring, which is difficult to cover the entire surface of the wind turbine blade and has monitoring blind spots. As a result, there are still high quality risks and production costs in the manufacturing process of wind turbine blades.

[0031] To address this issue and reduce blind spots in monitoring the surface temperature of wind turbine blades during manufacturing, the inventors of this application have installed numerous sensors around the wind turbine blades to monitor their temperature. Because wind turbine blades are relatively large, a large number of sensors are required, increasing production costs and equipment maintenance complexity.

[0032] Based on this, the inventors of this application have redesigned the vacuum-injection flow-guiding and isolation component for wind turbine blades. During the vacuum injection process, an isolation membrane is laid on the blade body material, followed by the flow-guiding mesh laid on the isolation membrane. The resin diffuses rapidly and evenly to all areas of the blade mold through the pores and channels of the flow-guiding mesh, ensuring that the composite material is fully impregnated. The isolation mesh is used to prevent the flow-guiding mesh from adhering to the cured resin (facilitating later peeling) and ensuring the surface quality of the product.

[0033] By installing a thermosensitive color-changing layer on the airflow guide net and / or isolation membrane, real-time and visual temperature monitoring can be provided during blade heating and curing or maintenance heating. The thermosensitive color-changing layer can cover the entire blade or a portion of it, allowing the covered area to monitor localized temperature anomalies during the vacuum filling process when the airflow guide net and isolation membrane are attached to the wind turbine blade surface. Once the surface temperature of the covered area exceeds a preset threshold, the color changes from the first color to the second color (e.g., from light to dark), allowing operators to visually observe the color-changing area. This enables comprehensive and real-time temperature monitoring of the wind turbine blade surface, preventing localized overheating issues from being overlooked due to monitoring blind spots.

[0034] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This flow-guiding and isolation component can quickly respond to temperature changes. When the local temperature abnormally rises above a preset threshold, the area covered by the temperature-sensitive color-changing layer immediately changes color, promptly alerting operators. It can detect localized temperature anomalies in a timely manner, allowing operators to intervene promptly, effectively avoiding quality problems caused by localized overheating, reducing the defect rate of wind turbine blades, improving product quality, and ensuring the reliability and stability of wind turbine blades in actual operation.

[0035] Meanwhile, temperature monitoring using this airflow isolation component eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the wind turbine blades simply by observing the color changes of the isolation membrane and the airflow guide net. Compared to traditional monitoring methods that require wiring for thermocouples or specialized equipment and calibration maintenance for infrared thermometry, this airflow isolation component simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, but not all embodiments.

[0037] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0038] According to embodiments of the present invention, on the one hand, such as Figures 1 to 3 As shown, a vacuum injection flow guiding and isolation assembly for wind turbine blades is provided, including an isolation membrane 100 and a flow guiding net 200.

[0039] Specifically, such as Figures 1 to 3 As shown, the flow guide net 200 is covered on the isolation membrane 100, wherein the flow guide net 200 and / or the isolation membrane 100 are provided with a temperature-sensitive color-changing layer 300.

[0040] Specifically, the thermochromic layer 300 is configured to change color in response to temperature changes, and is used to monitor local temperature anomalies during the vacuum injection process of wind turbine blades. When the temperature in the area covered by the thermochromic layer 300 exceeds a preset threshold, the thermochromic layer 300 changes from a first color to a second color, and the first color and the second color are different.

[0041] This wind turbine blade vacuum-injected flow-guiding and isolation assembly involves laying an isolation membrane 100 onto the blade body material during the vacuum injection process, followed by laying a flow-guiding mesh 200 on top of the isolation membrane 100. The resin diffuses rapidly and evenly to all areas of the blade mold through the pores and channels of the flow-guiding mesh 200, ensuring the composite material is fully impregnated. The isolation mesh prevents the flow-guiding mesh 200 from adhering to the cured resin (facilitating later peeling) and also prevents impurities or air bubbles in the resin from entering the blade body structure, ensuring product surface quality.

[0042] By installing a thermosensitive color-changing layer 300 on the airflow guide net 200 and / or the isolation membrane 100, real-time and visual temperature monitoring can be provided during blade heating and curing or maintenance heating. The thermosensitive color-changing layer 300 can cover the entire blade or a portion of it, allowing the covered area to monitor localized temperature anomalies during the vacuum injection process when the airflow guide net 200 and isolation membrane 100 are attached to the wind turbine blade surface. Once the surface temperature of the area covered by the thermosensitive color-changing layer 300 exceeds a preset threshold, the color changes from a first color to a second color (e.g., from light to dark), allowing operators to visually observe the color-changing area. This enables comprehensive and real-time temperature monitoring of the wind turbine blade surface, preventing localized overheating problems from being overlooked due to monitoring blind spots.

[0043] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This flow-guiding and isolation component can quickly respond to temperature changes. When the local temperature abnormally rises above a preset threshold, the area covered by the temperature-sensitive color-changing layer 300 immediately changes color, promptly alerting operators. It can detect localized temperature anomalies in a timely manner, allowing operators to intervene promptly, effectively avoiding quality problems caused by localized overheating, reducing the defect rate of wind turbine blades, improving product quality, and ensuring the reliability and stability of wind turbine blades in actual operation.

[0044] Meanwhile, temperature monitoring using this airflow isolation component eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the wind turbine blades simply by observing the color changes of the isolation membrane 100 and the airflow guide net 200. Compared to traditional monitoring methods that require wiring for thermocouples or specialized equipment and calibration maintenance for infrared temperature measurement, this airflow isolation component simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0045] Specifically, the thermochromic layer 300 is a functional layer that is sensitive to temperature changes and can intuitively present temperature information through color changes. The thermochromic layer 300 is mainly composed of thermosensitive pigments / microcapsules and binders or dispersion media. It achieves color change through specific chemical reactions or physical changes and has a variety of characteristics and application advantages.

[0046] Specifically, the thermosensitive color-changing layer 300 can be applied to the outer surface of the flow guide net 200 or the outer surface of the isolation membrane 100. Alternatively, the thermosensitive color-changing layer 300 can be applied inside the flow guide net 200 or the isolation membrane 100. In this embodiment, the application does not impose specific restrictions on the placement of the thermosensitive color-changing layer 300.

[0047] It should be noted that the first color and the second color are different. The first color represents the color of the isolation membrane 100 and the guide net 200 under normal temperature conditions of the wind turbine blade, while the second color represents the color of the isolation membrane 100 and the guide net 200 when the temperature exceeds a preset threshold. In actual production, if the thermosensitive color-changing layer 300 of the isolation membrane 100 and the guide net 200 is set to a light color, such as light blue, under normal conditions, and the thermosensitive color-changing layer 300 turns to a dark color, such as dark black, when the local temperature exceeds the preset threshold, for example, reaching 60℃, the operator can quickly detect the temperature abnormality from the obvious color change, and can intuitively determine which areas on the surface of the wind turbine blade are too hot without the need for additional complex equipment or data analysis.

[0048] Specifically, the choice of the first and second colors can be adjusted according to the actual production scenario and needs. For some wind turbine blade materials or production processes that are more sensitive to temperature changes, a color combination with higher contrast, such as yellow and red, can be selected to make the temperature change display more prominent. For situations where it is necessary to distinguish different temperature ranges, multiple different second colors can be set to correspond to different temperature thresholds, providing operators with more detailed temperature information and helping them to control the production process more accurately.

[0049] In one embodiment, the preset threshold is any temperature value within the range of 40℃ to 100℃.

[0050] The exothermic peak and curing temperature of the resin used for wind turbine blade infusion vary (for example, the exothermic peak of some resins is 60~80℃, and some special materials may require monitoring at lower or higher temperatures). The wide range of 40℃-100℃ can flexibly match the temperature warning requirements of different resin types, wind turbine blade specifications and production processes, ensuring that the thermosensitive color-changing layer 300 can accurately respond to the critical temperature in specific scenarios.

[0051] From the low-temperature flow stage at the beginning of resin infusion, to the heat release peak during the curing process, and then to the temperature control for later maintenance heating, the range of 40℃-100℃ can cover the temperature anomaly range that may occur in the manufacturing and maintenance of wind turbine blades, avoiding the omission of local overheating risks at different stages due to fixed preset thresholds, and realizing temperature safety monitoring throughout the entire process.

[0052] In one embodiment, such as Figure 1 and Figure 2 As shown, both the flow guide net 200 and the isolation membrane 100 are provided with a temperature-sensitive color-changing layer 300.

[0053] The flow guide net 200 directly contacts the resin flow path, and the thermosensitive color-changing layer 300 on the flow guide net 200 can reflect local temperature changes during the resin flow process in real time (such as instantaneous overheating caused by resin accumulation); the isolation membrane 100 is close to the blade body material, and the thermosensitive color-changing layer 300 on the isolation membrane 100 can monitor the temperature distribution in the core area of ​​the curing reaction (such as continuous heat release near the fiber layer). The combination of the two can capture anomalies from both the flow path and the core curing area, avoiding the omission of a single monitoring point and ensuring no temperature blind spots.

[0054] In addition, when the color-changing layers of the flow guide net 200 and the separator 100 show consistent color changes in the same area (such as both exceeding the preset threshold for color change), the authenticity of the temperature anomaly in that area can be cross-verified, avoiding misjudgments caused by local environmental interference (such as impurities or light) on a single material; if there is a difference in color change between the two, it can also help analyze the cause of the anomaly (such as the flow guide net 200 heating up first due to the fast resin flow, while the separator 100 does not change color due to the lag in heat conduction), providing a more detailed basis for process adjustment.

[0055] In addition, wind turbine blades have complex structures (such as uneven thickness and many corners). The dual temperature-sensitive color-changing layer 300 of the guide net 200 and the isolation membrane 100 can complement each other to cover the complex areas of the blade through different laying angles and coverage ranges. It is especially suitable for temperature monitoring of large blades or irregular structures, ensuring that the temperature status of the entire area can be captured.

[0056] In one embodiment, the thermochromic layer 300 is a reversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer 300 decreases from a state exceeding a preset threshold to a state below a preset threshold, the color of the area covered by the thermochromic layer 300 changes from a second color to a first color.

[0057] In the production of wind turbine blades, resin curing is a dynamic process with constantly changing temperatures. The reversible thermochromic layer 300 can track temperature changes in real time. When the temperature of the area covered by the thermochromic layer 300 exceeds a preset threshold, the color changes from the first color to the second color, alerting operators to an abnormal temperature. When the temperature returns to normal, the color changes back to the first color. This allows operators to continuously monitor temperature fluctuations and promptly identify potential problems. In the early stages of resin curing, due to the intense chemical reaction, local temperatures may fluctuate frequently. The reversible color-changing characteristic allows operators to monitor the temperature at any time, ensuring the entire curing process is conducted within a suitable temperature range. If an abnormal temperature is detected during production, operators can take measures to cool down the area. Once the temperature returns to normal, the reversible thermochromic layer 300 will revert to the first color, allowing subsequent operations to continue without waiting for the entire production process to end for inspection and adjustments. This avoids production interruptions and delays caused by temperature issues, improving production efficiency.

[0058] The reversible color-changing characteristic helps operators analyze temperature change trends. By observing the frequency and duration of color changes, the severity and duration of temperature anomalies can be determined. Frequent color changes in a certain area indicate large temperature fluctuations, potentially indicating poor heat dissipation or other problems; prolonged color changes suggest a more severe temperature anomaly, requiring timely adjustment of process parameters.

[0059] Specifically, wind turbine blade production is typically large-scale and continuous. The reversible thermochromic layer 300 can be used multiple times, effectively monitoring temperature in each production cycle. Compared to disposable or irreversible monitoring methods, this significantly reduces production costs. For example, a production line producing multiple wind turbine blades daily would require replacing irreversible thermochromic flow-guiding isolation components each time, resulting in high costs. In contrast, the reversible thermochromic flow-guiding isolation component can be reused repeatedly; ensuring its stable performance is sufficient to continuously serve production.

[0060] Specifically, the material of the reversible color-changing layer can be inorganic thermochromic material, organic thermochromic material, etc. In this embodiment, no specific limitation is made on the material of the reversible color-changing layer.

[0061] For example, the material of the reversible color-changing layer can be pure VO2, an inorganic thermochromic material, whose color changes with temperature and composition. Within a certain temperature range, the color can reversibly change between colorless, light yellow, and dark blue.

[0062] For example, the material of the reversible color-changing layer can be a spiropyran-based organic thermochromic material. At different temperatures, the molecular structure will switch between a spirocyclic structure and an open-ring structure, thereby causing a color change, such as from colorless to blue or purple.

[0063] In one embodiment, the thermochromic layer 300 is an irreversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer 300 decreases from a state exceeding a preset threshold to a state below a preset threshold, the color of the area covered by the thermochromic layer 300 remains the second color.

[0064] The irreversible color-changing layer accurately records temperatures exceeding a preset threshold. Regardless of subsequent temperature changes, the color-changing area retains its second color, providing a clear and tamper-proof record of temperature anomalies during production. This helps operators clearly understand which parts of the wind turbine blades experienced temperature problems, as well as the approximate severity and scope of the issues, facilitating the tracing and investigation of potential quality hazards during subsequent quality inspections and analyses.

[0065] The preset threshold temperature for reversible color-changing layers is generally between 50°C and 80°C. If the temperature of the wind turbine blade exceeds 80°C, the reversible color-changing layer will not change color according to the established color-changing mechanism to alert the operator because it exceeds its set threshold range. The preset threshold temperature for irreversible color-changing layers can be flexibly set to exceed 80°C. When the temperature of the wind turbine blade exceeds 80°C, the irreversible color-changing layer can change color to alert the operator based on its own set threshold above 80°C, preventing the membrane 100 from being damaged by high temperature and causing rupture.

[0066] There are many types of materials used for irreversible color-changing layers. Commonly used materials include phosphates, sulfates, nitrates, oxides, and sulfides of lead, nickel, chromium, zinc, cobalt, iron, cadmium, strontium, magnesium, barium, molybdenum, and manganese, as well as methyl violet, phenolic compounds, acid clay, azo pigments, and arylmethane pigments. Specifically, high-temperature resistant fluorane dyes can be used as leuco dyes, p-toluenesulfonic acid as a color developer, and microencapsulated for one-time temperature indication at around 100°C.

[0067] In one embodiment, such as Figure 1 and Figure 3 As shown, a thermosensitive color-changing layer 300 is provided on the outer surface of the guide net 200 and / or the outer surface of the isolation membrane 100.

[0068] By placing the thermochromic layer 300 on the outer surface of the flow guide net 200 and / or the isolation membrane 100, the thermochromic layer 300 is directly exposed to the visible range. Operators can quickly observe the color change with the naked eye without disassembling or touching the inside of the component, and can detect temperature anomalies at the first time. At the same time, the heat exchange between the outer surface and the environment is more direct, and the response to temperature fluctuations is more sensitive, which can shorten the early warning delay time and provide a more sufficient window for timely intervention.

[0069] A thermosensitive color-changing layer 300 is provided on the outer surface of the flow guide net 200 and / or the separator 100. This eliminates the need for complex modifications to the internal structure of the flow guide net 200 or the separator 100, avoids potential damage to material properties due to internal integration, simplifies the production process, and makes it easier for industrial-scale mass production.

[0070] In one embodiment, the thermochromic layer 300 is applied to the outer surface of the flow guide net 200 and / or the outer surface of the isolation membrane 100 by spraying, printing or hot pressing.

[0071] The spraying process is suitable for complex curved surfaces or mesh structures (such as the mesh gaps of the flow guide 200). It can evenly cover irregular surfaces with atomized paint, ensuring that the thermosensitive color-changing layer 300 has no dead corners. The printing process is suitable for flat or regularly textured surfaces of the release film 100. It can precisely control the pattern and thickness of the thermosensitive color-changing layer 300, avoiding material waste. The hot-pressing process combines the pre-made thermosensitive color-changing film with the flow guide 200 or the release film 100 under high temperature and pressure. It is suitable for scenarios with high adhesion requirements and will not affect the original performance of the flow guide 200 or the release film 100 due to solvents.

[0072] Spraying, printing, and hot-pressing are all mature mass production processes that can be integrated into existing production lines for guide nets 200 and separators 100 (e.g., spraying directly online after substrate molding) without the need for additional complex equipment. Furthermore, process parameters (such as coating thickness and bonding temperature) are easy to control, enabling efficient mass production, reducing the manufacturing cost per unit, and meeting the needs of large-scale wind turbine blade production.

[0073] For example, printing processes can be used to create thicker color-changing layers in specific areas (such as blade corners and thick-walled areas), enhancing the sensitivity of temperature monitoring in critical areas; spraying processes can flexibly adjust the formulation of color-changing materials to achieve customization of different temperature thresholds (such as 40℃, 60℃, 80℃), meeting the process requirements of different resin systems or blade models and improving the versatility of components.

[0074] In one embodiment, such as Figure 3 As shown, the flow-guiding and isolation assembly also includes a protective layer 400, wherein the protective layer 400 is applied to the outer surface of the thermochromic layer 300.

[0075] By setting a protective layer 400 on the outer surface of the thermochromic layer 300, direct contact between the thermochromic layer 300 and external substances such as resin and solvent can be isolated, avoiding failure of the color-changing material due to chemical corrosion (such as active ingredients in resin), physical friction (such as pressure extrusion during vacuum infusion), or high-temperature aging. This ensures that the thermochromic layer 300 maintains a sensitive response to temperature throughout the entire infusion and curing process, reducing monitoring failures caused by damage to the thermochromic layer 300.

[0076] The vacuum infusion process involves complex conditions such as negative pressure environment, temperature fluctuation and resin flow impact. The protective layer 400 can enhance the bonding strength between the thermosensitive color-changing layer 300 and the flow guide net 200 / isolation membrane 100, preventing the thermosensitive color-changing layer 300 from falling off or cracking under stress. At the same time, the material of the protective layer 400 can increase the upper limit of the temperature resistance of the thermosensitive color-changing layer 300, so that the thermosensitive color-changing layer 300 can still work stably in high temperature environment close to the preset threshold, and extend the effective monitoring cycle.

[0077] Specifically, the protective layer 400 can be made of polyester film, polypropylene film, polyurethane coating, etc. In this embodiment, no specific restrictions are placed on the material type of the protective layer 400.

[0078] In one embodiment, such as Figure 2 As shown, the thermosensitive color-changing layer 300 is disposed inside the flow guide net 200 and / or inside the isolation membrane 100.

[0079] The internally installed thermochromic layer 300 can be encapsulated by the mesh structure of the flow guide net 200 or the substrate of the separator 100 itself, reducing direct contact with the external environment (such as resin, solvent, mechanical friction) and lowering the risk of failure due to chemical corrosion and physical wear. For example, the thermochromic layer 300 inside the flow guide net 200 will not be washed away by the flowing resin, and the thermochromic layer 300 inside the separator 100 can also avoid being squeezed and damaged under vacuum negative pressure, ensuring a stable response to temperature changes throughout the entire process cycle.

[0080] The outer surface of the flow guide 200 needs to be smooth or have a specific texture to ensure smooth resin flow, and the outer surface of the release membrane 100 needs to have good isolation or adhesion. Placing the color-changing layer inside can avoid changing its original physical properties due to the color-changing material being coated on the surface, ensuring that the core functions such as flow guidance and isolation are not affected, and there is no need to worry that the color-changing layer will obstruct the resin flow channel or damage the isolation effect.

[0081] In one embodiment, the thermosensitive color-changing layer 300 is disposed inside the flow guide net 200 and / or the isolation membrane 100 by a multi-layer co-extrusion process.

[0082] The multi-layer co-extrusion process involves co-extruding and compounding the thermosensitive color-changing layer 300 material with the substrate of the flow guide net 200 / isolation membrane 100 in a molten state. This results in a tight intermolecular bond between the thermosensitive color-changing layer 300 and the substrate of the flow guide net 200 / isolation membrane 100, rather than a physical connection achieved through later bonding. This prevents the thermosensitive color-changing layer 300 from falling off during use due to resin erosion, mechanical stress, or temperature changes, ensuring that it consistently performs its temperature monitoring function during core functions such as flow guidance and isolation.

[0083] Multi-layer co-extrusion does not damage the pore structure of the flow guide 200 during the molding process (ensuring smooth resin flow) nor does it affect the key properties of the release liner 100, such as barrier properties and temperature resistance. By controlling parameters such as extrusion temperature and pressure during the process, the temperature-sensitive color-changing layer 300 can be prevented from failing due to high temperatures, while ensuring that the mechanical strength and chemical stability of the substrate are not affected, thus achieving compatibility between the temperature monitoring function and the core function of the substrate.

[0084] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0085] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0086] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A vacuum-filled flow-guiding and isolation assembly for wind turbine blades, characterized in that, include: Separator (100); A flow guide net (200) is applied to the isolation membrane (100), and the flow guide net (200) and / or the isolation membrane (100) are provided with a thermosensitive color-changing layer (300). The thermochromic layer (300) is configured to change color in response to temperature changes, and is used to monitor local temperature anomalies during the vacuum injection process of wind turbine blades. When the temperature in the area covered by the thermochromic layer (300) exceeds a preset threshold, the thermochromic layer (300) changes from a first color to a second color, and the first color and the second color are different.

2. The wind turbine blade vacuum injection flow guiding and isolation assembly according to claim 1, characterized in that, The preset threshold is any temperature value within the range of 40℃ to 100℃.

3. The wind turbine blade vacuum injection flow guiding and isolation assembly according to claim 2, characterized in that, Both the flow guide net (200) and the isolation membrane (100) are provided with a thermosensitive color-changing layer (300).

4. The wind turbine blade vacuum injection flow guiding and isolation assembly according to claim 2, characterized in that, The thermochromic layer (300) is a reversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer (300) decreases from a state exceeding the preset threshold to a state below the preset threshold, the color of the area covered by the thermochromic layer (300) changes from the second color to the first color.

5. The wind turbine blade vacuum injection flow guiding and isolation assembly according to claim 2, characterized in that, The thermochromic layer (300) is an irreversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer (300) decreases from a state exceeding the preset threshold to a state below the preset threshold, the color of the area covered by the thermochromic layer (300) remains the second color.

6. The wind turbine blade vacuum injection flow guiding and isolation assembly according to any one of claims 1 to 5, characterized in that, The thermosensitive color-changing layer (300) is provided on the outer surface of the flow guide net (200) and / or the outer surface of the isolation membrane (100).

7. The wind turbine blade vacuum injection flow guiding and isolation assembly according to claim 6, characterized in that, The thermosensitive color-changing layer (300) is applied to the outer surface of the flow guide net (200) and / or the outer surface of the isolation membrane (100) by spraying, printing or hot pressing.

8. The wind turbine blade vacuum injection flow guiding and isolation assembly according to claim 7, characterized in that, The flow-guiding isolation component also includes a protective layer (400) which covers the outer surface of the thermosensitive color-changing layer (300).

9. The wind turbine blade vacuum injection flow guiding and isolation assembly according to any one of claims 1 to 5, characterized in that, The thermosensitive color-changing layer (300) is disposed inside the flow guide net (200) and / or inside the isolation membrane (100).

10. The wind turbine blade vacuum injection flow guiding and isolation assembly according to claim 9, characterized in that, The thermosensitive color-changing layer (300) is disposed inside the flow guide net (200) and / or inside the isolation membrane (100) through a multi-layer co-extrusion process.

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