Wind turbine blade reinforcement tube structure

Abstract

The application discloses a wind power generation blade reinforcing tube structure, wherein the wind power generation blade reinforcing tube structure comprises a reinforcing tube body and a temperature-sensitive color-changing layer; the reinforcing tube body comprises, from inside to outside, an inner base layer, a reinforcing layer and an outer covering layer; the temperature-sensitive color-changing layer is arranged on the outer surface of the reinforcing tube body or embedded in the reinforcing tube body; the temperature-sensitive color-changing layer is used for monitoring local temperature abnormalities of the reinforcing tube structure in a vacuum infusion process of a wind power generation blade; when the temperature of the temperature-sensitive color-changing layer covering area exceeds a preset threshold, 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 quickly respond to temperature changes; when the local temperature abnormalities exceed the preset threshold, the temperature-sensitive color-changing layer covering area immediately changes color, an early warning is sent to an operator in time, quality problems caused by local overheating are effectively avoided, the substandard rate of the wind power generation blade is reduced, and the product quality is improved.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a wind turbine blade reinforcement tube structure. Background Technology

[0002] In the vacuum infusion process of wind turbine blades, the reinforcing tube is a key component to ensure resin delivery and system sealing, and its performance stability directly affects the blade molding quality.

[0003] In the existing technology, during the vacuum infusion process, the connection between the injection port and the reinforcing tube is prone to local heat concentration due to resin accumulation. Excessive temperature will cause the reinforcing tube to soften and the sealing performance to decrease, which will lead to air leakage and even cause the blade to be scrapped. Utility Model Content

[0004] The purpose of this application is to provide a wind turbine blade reinforcement tube structure that can quickly respond to temperature changes. When the local temperature rises abnormally and exceeds a preset threshold, the area covered by the temperature-sensitive color-changing layer immediately changes color, promptly issuing an early warning to the operator. This effectively avoids quality problems caused by local overheating, reduces the defect rate of wind turbine blades, and improves product quality.

[0005] In a first aspect, this utility model provides a wind turbine blade reinforcement tube structure, comprising: The reinforced pipe body consists of, from the inside out, an inner base layer, a reinforcing layer, and an outer cladding layer; A thermosensitive color-changing layer is disposed on the outer surface of the reinforcing tube body or embedded inside the reinforcing tube body; The thermochromic layer is configured to change color in response to temperature changes, and is used to monitor local temperature anomalies in the reinforcing tube structure 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 reinforcement tube structure, by incorporating a thermosensitive color-changing layer on the main body of the reinforcement tube, provides real-time, visualized temperature monitoring during blade heating and curing or maintenance. The thermosensitive color-changing layer can cover the entire reinforcement tube structure or a portion thereof, allowing the covered area to monitor localized temperature anomalies during vacuum infusion of the wind turbine blade. 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), which operators can visually observe. This enables comprehensive, real-time temperature monitoring of the reinforcement tube structure on the wind turbine blade, accurately capturing localized heat accumulation caused by resin buildup and preventing problems such as softening and leakage of the reinforcement tube due to undetected temperature anomalies. The color change of the thermosensitive color-changing layer precedes the heat resistance limit of the reinforcement tube, providing a time window for manual intervention (such as localized cooling), effectively preventing blade failure due to overheating. This is particularly suitable for the production of high-value, large wind turbine blades, reducing quality risks and cost waste.

[0007] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This reinforced tube structure can respond quickly 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.

[0008] Meanwhile, using this reinforced tube structure for temperature monitoring eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the reinforced tube structure on the wind turbine blade simply by observing its color change. Compared to traditional monitoring methods that require wiring with thermocouples or specialized equipment and calibration maintenance with infrared thermometry, this reinforced tube structure simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0009] Furthermore, the usage of this reinforced pipe structure is basically the same as that of ordinary reinforced pipe structures, requiring no changes to vacuum extraction, laying methods, or curing processes. Only a temperature-sensitive color-changing layer needs to be added to the multi-layered structure of the reinforced pipe itself, resulting in minimal process modifications and easy large-scale deployment.

[0010] In one optional embodiment, the thermosensitive color-changing layer is disposed between any two of the inner base layer, the reinforcing layer, and the outer cover layer.

[0011] Beneficial effects: Localized heat release during the injection of wind turbine blades is often accompanied by heat transfer between layers (such as the diffusion of heat from the inner base layer to the reinforcing layer and outer coating layer due to resin accumulation). Embedding the thermosensitive color-changing layer between any two layers can directly capture abnormal heat conduction between layers. This is more effective in reflecting the dynamic changes in temperature distribution than placing it only on the surface or at a single point inside, thus improving the accuracy of monitoring.

[0012] In one optional embodiment, the thermochromic layer is disposed between the reinforcing layer and the outer coating layer.

[0013] Beneficial effects: The reinforcing layer is the core of the tube's mechanical support. The gap between the reinforcing layer and the outer coating is close to the outside of the reinforced tube body. This not only reflects the tendency of heat generated by resin accumulation to be transferred to the outside, but also covers areas prone to overheating, such as the glue injection port connection. Temperature changes at this location are directly related to the stability of the reinforcing layer, and can provide early warning of the reduction in the strength of the reinforced tube structure caused by high temperature.

[0014] In one alternative embodiment, the thermochromic layer is applied to the outer surface of the reinforcing layer by spraying, printing, or hot-pressing.

[0015] Beneficial effects: Spraying, printing, and hot pressing are all mature surface treatment processes that can be directly processed on the outer surface of the reinforcing layer in batches without modifying the internal structure of the reinforcing tube (such as the inner base layer and the reinforcing layer). This results in high production efficiency and strong compatibility with existing reinforcing tube manufacturing processes, making it easy to achieve large-scale application.

[0016] In one alternative embodiment, the thermochromic layer is embedded inside the outer coating layer.

[0017] Beneficial effects: The outer cladding itself is the outer protective structure of the reinforcing tube. After the thermochromic layer is embedded inside it, it can be completely wrapped by the outer cladding, isolating it from external mechanical friction, impact, ultraviolet radiation and chemical corrosion. It can also avoid material dissolution or wear caused by direct contact with the inner base layer and the reinforcing layer. It can significantly reduce the risk of the thermochromic layer failing due to external factors, and is especially suitable for reinforcing tube scenarios that are used repeatedly for a long time.

[0018] In one alternative embodiment, the thermochromic layer and the outer coating layer are formed into the reinforced tube structure by multi-layer co-extrusion.

[0019] Beneficial effects: The multi-layer co-extrusion process uses the same extrusion equipment to simultaneously extrude and composite the thermosensitive color-changing material and the outer coating material in a molten state. This can eliminate air and impurities at the interlayer interface, allowing the thermosensitive color-changing layer and the outer coating to form a molecular-level bond, significantly improving the adhesion strength of the two and avoiding the delamination and peeling problems that may occur in traditional bonding processes. It is especially suitable for scenarios where the reinforced tube is subjected to pressure fluctuations during vacuum injection.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Beneficial effects: The irreversible color-changing property can permanently retain traces of temperatures exceeding a preset threshold. Even if the temperature subsequently drops to a safe range, the color remains the second color, which can clearly mark the areas where overheating occurred during the wind turbine blade injection process. This provides direct evidence for process review and quality traceability, and facilitates the analysis of high-frequency locations of resin accumulation and heat release concentration, thereby optimizing the injection process or adjusting the reinforcement tube structure layout.

[0024] In one optional implementation, the preset threshold is any temperature value within the range of 40℃ to 100℃.

[0025] 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.

[0026] In one alternative embodiment, the reinforcing layer is a steel wire structure.

[0027] Beneficial effects: The reinforcing layer uses a steel wire structure, giving it high tensile strength and elastic modulus. As a reinforcing layer, it enhances the tensile, bending, and impact resistance of the reinforced pipe structure. For example, in fluid transport pipelines, it can effectively resist pipe wall expansion or rupture caused by internal medium pressure, ensuring the stability of the reinforced pipe structure. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a cross-sectional view of a wind turbine blade reinforcement tube structure according to one embodiment provided in this application; Figure 2 This is a cross-sectional view of the wind turbine blade reinforcement tube structure in another embodiment provided in this application.

[0030] Explanation of reference numerals in the attached figures: 100. Reinforced pipe body; 110. Inner base layer; 120. Reinforcing layer; 130. Outer cladding layer; 200. Thermochromic layer. Detailed Implementation

[0031] In related technologies, during the vacuum infusion process, the connection between the injection port and the reinforcing tube is prone to local heat concentration due to resin accumulation. Excessive temperature can cause the reinforcing tube to soften and the sealing performance to decrease, which in turn can lead to air leakage and even cause the blade to be scrapped.

[0032] Based on this, the inventors of this application have redesigned the structure of the reinforcing tube for wind turbine blades. By setting a thermosensitive color-changing layer on the main body of the reinforcing tube, a real-time and visual temperature monitoring method can be provided during the heating and curing of the blade or maintenance heating. The thermosensitive color-changing layer can cover the entire reinforcing tube structure or a part of the reinforcing tube structure, so that during the use of the reinforcing tube structure, the area covered by the thermosensitive color-changing layer can be used to monitor local temperature anomalies in the reinforcing tube structure during the vacuum filling process of the wind turbine blade. Once the surface temperature of the area covered by the thermosensitive color-changing layer exceeds a preset threshold, the color changes from the first color to the second color (e.g., from light to dark), and the operator can intuitively see the color-changing area. This enables comprehensive and real-time temperature monitoring of the reinforcing tube structure on the wind turbine blade, accurately capturing the problem of local heat concentration caused by resin accumulation, and avoiding problems such as softening and air leakage of the main body of the reinforcing tube due to undetected temperature anomalies. The color change of the thermochromic layer occurs earlier than the heat resistance limit of the reinforcing tube, providing a time window for artificial intervention (such as local cooling). This effectively prevents blade scrapping due to overheating, making it particularly suitable for the production of high-value large wind turbine blades, reducing potential quality risks and cost waste.

[0033] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This reinforced tube structure can respond quickly 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.

[0034] Meanwhile, using this reinforced tube structure for temperature monitoring eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the reinforced tube structure on the wind turbine blade simply by observing its color change. Compared to traditional monitoring methods that require wiring with thermocouples or specialized equipment and calibration maintenance with infrared thermometry, this reinforced tube structure simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0035] Furthermore, the usage of this reinforced pipe structure is basically the same as that of ordinary reinforced pipe structures, requiring no changes to vacuum extraction, laying methods, or curing processes. Only a temperature-sensitive color-changing layer needs to be added to the multi-layered structure of the reinforced pipe itself, resulting in minimal process modifications and easy large-scale deployment.

[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 2 The following describes embodiments of the present invention.

[0038] According to embodiments of the present invention, on the one hand, such as Figure 1 and Figure 2 As shown, a wind turbine blade reinforcement tube structure is provided, including a reinforcement tube body 100 and a thermo-sensitive color-changing layer 200.

[0039] Specifically, such as Figure 1 As shown, the reinforced pipe body 100 includes an inner base layer 110, a reinforcing layer 120, and an outer cladding layer 130, wherein the inner base layer 110, the reinforcing layer 120, and the outer cladding layer 130 are arranged sequentially from the inside to the outside.

[0040] Specifically, such as Figure 1 and Figure 2 As shown, the thermo-color-changing layer 200 is disposed on the outer surface of the reinforcing tube body 100, or the thermo-color-changing layer 200 is disposed inside the reinforcing tube body 100.

[0041] Specifically, the thermochromic layer 200 is configured to change color in response to temperature changes, and is used to monitor local temperature anomalies in the reinforcing tube structure during the vacuum injection process of wind turbine blades. When the temperature in the area covered by the thermochromic layer 200 exceeds a preset threshold, the thermochromic layer 200 changes from a first color to a second color, and the first color and the second color are different.

[0042] This wind turbine blade reinforcement tube structure, by incorporating a thermosensitive color-changing layer 200 on the reinforcement tube body 100, provides real-time, visualized temperature monitoring during blade heating and curing or maintenance heating. The thermosensitive color-changing layer 200 can cover the entire reinforcement tube structure or a portion thereof, allowing the covered area to monitor localized temperature anomalies during vacuum infusion of the wind turbine blade. Once the surface temperature of the covered area 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 change. This enables comprehensive, real-time temperature monitoring of the reinforcement tube structure on the wind turbine blade, accurately capturing localized heat concentration caused by resin buildup and preventing problems such as softening and leakage of the reinforcement tube body 100 due to undetected temperature anomalies. The color change of the thermochromic layer 200 occurs earlier than the heat resistance limit of the reinforcing tube, providing a time window for manual intervention (such as local cooling). This effectively prevents blade scrapping due to overheating, making it particularly suitable for the production of high-value large wind turbine blades, reducing potential quality risks and cost waste.

[0043] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This reinforced tube structure can quickly respond to temperature changes; when a localized temperature abnormally rises above a preset threshold, the area covered by the temperature-sensitive color-changing layer 200 immediately changes color, promptly alerting operators. This timely detection of localized temperature anomalies allows for prompt intervention, effectively preventing 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, using this reinforced tube structure for temperature monitoring eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the reinforced tube structure on the wind turbine blade simply by observing its color change. Compared to traditional monitoring methods that require wiring with thermocouples or specialized equipment and calibration maintenance with infrared thermometry, this reinforced tube structure simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0045] Furthermore, the usage of this reinforced pipe structure is basically the same as that of ordinary reinforced pipe structures, requiring no changes to vacuum extraction, laying methods, or curing processes. Only a thermosensitive color-changing layer 200 needs to be added to the multi-layered structure of the reinforced pipe itself, resulting in minimal process modifications and easy large-scale promotion.

[0046] Specifically, the inner base layer 110, as the inner foundation structure of the wind turbine blade reinforcement tube, is in direct contact with fluids such as injection resin, and needs to meet the requirements of chemical corrosion resistance and a certain degree of flexibility. Therefore, the inner base layer 110 can be made of materials such as modified polyethylene, polyvinyl chloride, and silicone composite materials. In this embodiment, no specific restrictions are placed on the material of the inner base layer 110.

[0047] Specifically, as the core load-bearing structure of the wind turbine blade reinforcement tube, the reinforcement layer 120 needs to bear the mechanical support function of the reinforcement tube body 100. Therefore, the reinforcement layer 120 can be made of steel wire skeleton, glass fiber reinforced composite material, etc. In this embodiment, no specific restrictions are placed on the material of the reinforcement layer 120.

[0048] Specifically, the outer cladding layer 130, as the outermost structure of the wind turbine blade reinforcement tube, needs to protect the internal structure. Therefore, the outer cladding layer 130 can be made of modified polypropylene, polyamide, thermoplastic elastomer, etc. In this embodiment, no specific restrictions are placed on the material of the outer cladding layer 130.

[0049] Specifically, the thermochromic layer 200 is a functional layer that is sensitive to temperature changes and can intuitively present temperature information through color changes. The thermochromic layer 200 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 properties and application advantages.

[0050] Specifically, the thermochromic layer 200 can be applied to the outer surface of the reinforcing tube body 100. The outer surface of the reinforcing tube body 100 can be entirely covered by the thermochromic layer 200, or only partially covered. In this embodiment, no specific limitation is placed on the size of the area covered by the thermochromic layer 200 and the reinforcing tube body 100. Alternatively, the thermochromic layer 200 can be embedded within the reinforcing tube body 100.

[0051] It should be noted that the first color and the second color are different. The first color represents the color of the reinforcing tube structure under normal temperature conditions, while the second color represents the color of the reinforcing tube structure when the temperature exceeds a preset threshold. In actual production, if the thermosensitive color-changing layer 200 of the reinforcing tube structure is set to a light color, such as light blue, under normal conditions, when the local temperature exceeds the preset threshold, such as reaching 60℃, the thermosensitive color-changing layer 200 turns into a dark color, such as dark black. Operators can quickly detect temperature abnormalities from the obvious color change, and can intuitively determine which areas of the reinforcing tube structure are overheating without the need for additional complex equipment or data analysis.

[0052] 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.

[0053] In one embodiment, such as Figure 1 As shown, the thermosensitive color-changing layer 200 is disposed between any two of the inner base layer 110, the reinforcing layer 120 and the outer cover layer 130.

[0054] Localized heat release during the injection of wind turbine blades is often accompanied by heat transfer between layers (such as the heat from resin accumulation spreading from the inner base layer 110 to the reinforcing layer 120 and the outer cover layer 130). By embedding the thermosensitive color-changing layer 200 between any two layers, abnormal heat conduction between layers can be directly captured. This is more effective in reflecting the dynamic changes in temperature distribution than setting it only on the surface or at a single point inside, thus improving the accuracy of monitoring.

[0055] In addition, placing the thermochromic layer 200 between any two layers can provide physical protection for the thermochromic layer 200, preventing it from directly contacting the external environment (such as friction or collision) or internal fluids (such as resin corrosion), reducing the failure of the color-changing material caused by external factors, and is especially suitable for scenarios where reinforcing tubes are reused, ensuring long-term stable temperature sensing function.

[0056] Specifically, the thermochromic layer 200 can be disposed between the inner base layer 110 and the reinforcing layer 120, or between the reinforcing layer 120 and the outer cover layer 130. In this embodiment, the location of the thermochromic layer 200 is not specifically limited.

[0057] In one embodiment, such as Figure 1 As shown, the thermochromic layer 200 is disposed between the reinforcing layer 120 and the outer cover layer 130.

[0058] The reinforcing layer 120 is the core of the tube's mechanical support. The gap between the reinforcing layer 120 and the outer covering layer 130 is close to the outside of the reinforcing tube body 100. This not only reflects the tendency of heat generated by resin accumulation to be transferred to the outside, but also covers areas prone to overheating, such as the glue injection port connection. Temperature changes at this location are directly related to the stability of the reinforcing layer 120, and can provide early warning of the reduction in the strength of the reinforcing tube structure caused by high temperature.

[0059] In addition, the outer coating 130 provides a physical barrier for the thermochromic layer 200, preventing the thermochromic layer 200 from being directly exposed to external friction, impact or environmental erosion. At the same time, the thermal conductivity of the reinforcing layer 120 can quickly transfer local heat to the thermochromic layer, ensuring timely temperature response.

[0060] In one embodiment, the thermochromic layer 200 is disposed on the outer surface of the reinforcing layer 120 by spraying, printing or hot pressing.

[0061] Spraying, printing, and hot-pressing are all mature surface treatment processes that can be directly mass-produced on the outer surface of the reinforcing layer 120 without modifying the internal structure of the reinforcing tube (such as the inner base layer 110 and the reinforcing layer 120). This process is highly efficient and compatible with existing reinforcing tube manufacturing processes, making it easy to achieve large-scale application.

[0062] Specifically, spraying and printing enable large-area, continuous construction, making them suitable for mass production. Furthermore, the thickness and sensitivity of the color-changing layer can be controlled by adjusting the paint concentration or printing parameters to meet different temperature monitoring needs.

[0063] In one embodiment, such as Figure 2 The thermosensitive color-changing layer 200 shown is embedded inside the outer cover layer 130.

[0064] The outer cladding layer 130 itself is the outer protective structure of the reinforcing tube. After the thermochromic layer 200 is embedded inside it, it can be completely wrapped by the outer cladding layer 130, isolating it from external mechanical friction, impact, ultraviolet radiation and chemical corrosion (such as resin and solvent in the wind turbine blade injection environment). It can also avoid material mutual dissolution or wear caused by direct contact with the inner base layer 110 and the reinforcing layer 120. It can significantly reduce the risk of failure of the thermochromic layer 200 due to external factors, and is especially suitable for reinforcing tube scenarios that are used repeatedly for a long time.

[0065] Specifically, the outer coating 130 can be made of transparent or semi-transparent material. The thermosensitive color-changing layer 200 embedded inside can visualize the color change without penetrating the outer coating 130. The transparency of the outer coating 130 can directly transmit the color-changing signal, and workers can observe the temperature change with the naked eye.

[0066] In one embodiment, the thermochromic layer 200 and the outer coating layer 130 are formed into a reinforced tube structure by multi-layer co-extrusion.

[0067] The multi-layer co-extrusion process uses the same extrusion equipment to simultaneously extrude and composite the thermosensitive color-changing material and the outer coating layer 130 material in a molten state. This process can eliminate air and impurities at the interlayer interface, allowing the thermosensitive color-changing layer 200 and the outer coating layer 130 to form a molecular-level bond, significantly improving the adhesion strength of the two and avoiding the delamination and detachment problems that may occur in traditional bonding processes. It is especially suitable for scenarios where the reinforced tube is subjected to pressure fluctuations during vacuum injection.

[0068] In one embodiment, the thermochromic layer 200 is a reversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer 200 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 200 changes from a second color to a first color.

[0069] In the production of wind turbine blades, resin curing is a dynamic process with constantly changing temperatures. The reversible thermochromic layer 200 tracks these temperature changes in real time. When the temperature in the area covered by the layer exceeds a preset threshold, the color changes from the first color to the second color, alerting the operator 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 occurs within a suitable temperature range. If an abnormal temperature is detected during production, operators can take measures to cool the area. Once the temperature returns to normal, the reversible thermochromic layer 200 will revert to its first color, allowing subsequent operations to continue without waiting for the entire production process to finish before checking and adjusting. This avoids production interruptions and delays caused by temperature issues, improving production efficiency.

[0070] 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.

[0071] Specifically, wind turbine blade production is typically large-scale and continuous. The reversible thermochromic layer 200 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 the entire reinforcing tube structure each time if an irreversible thermochromic reinforcing tube structure was used, resulting in high costs. In contrast, the reversible thermochromic reinforcing tube structure can be reused repeatedly, and only requires ensuring its stable performance to continuously serve production.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In one embodiment, the thermochromic layer 200 is an irreversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer 200 decreases from a state exceeding a preset threshold to a state below the preset threshold, the color of the area covered by the thermochromic layer 200 remains the second color.

[0076] The irreversible color-changing property can permanently retain traces of temperatures exceeding a preset threshold. Even if the temperature subsequently drops to a safe range, the color will remain the second color, which can clearly mark the areas where overheating occurred during the wind turbine blade injection process. This provides a direct basis for process review and quality traceability, and facilitates the analysis of high-frequency locations of resin accumulation and heat release concentration, thereby optimizing the injection process or adjusting the reinforcement tube structure layout.

[0077] The preset threshold temperature for reversible color-changing layers is generally between 50°C and 80°C. If the temperature of the reinforcing tube structure 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 reinforcing tube structure 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 localized overheating of the reinforcing tube structure.

[0078] 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.

[0079] In one embodiment, the preset threshold is any temperature value within the range of 40℃ to 100℃.

[0080] 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 between 60℃ and 80℃, while some special materials may require monitoring at lower or higher temperatures). The wide range of 40℃ to 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 200 can accurately respond to the critical temperature in specific scenarios.

[0081] 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.

[0082] In one embodiment, the reinforcing layer 120 is a steel wire structure.

[0083] The reinforcing layer 120 uses a steel wire structure, giving it high tensile strength and elastic modulus. As a reinforcing layer, it enhances the tensile, bending, and impact resistance of the reinforced pipe structure. For example, in fluid transport pipelines, it can effectively resist pipe wall expansion or rupture caused by internal medium pressure, ensuring the stability of the reinforced pipe structure.

[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. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0088] 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 them. 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 therein. Such 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 wind turbine blade reinforcement tube structure, characterized in that, include: The reinforced pipe body (100) includes, from the inside out, an inner base layer (110), a reinforcing layer (120) and an outer covering layer (130). A thermosensitive color-changing layer (200) is disposed on the outer surface of the reinforcing tube body (100) or embedded inside the reinforcing tube body (100); The thermochromic layer (200) is configured to change color in response to temperature changes, and is used to monitor local temperature anomalies in the reinforcing tube structure during the vacuum injection process of the wind turbine blade. When the temperature in the area covered by the thermochromic layer (200) exceeds a preset threshold, the thermochromic layer (200) changes from a first color to a second color, and the first color and the second color are different.

2. The wind turbine blade reinforcement tube structure according to claim 1, characterized in that, The thermosensitive color-changing layer (200) is disposed between any two of the inner base layer (110), the reinforcing layer (120) and the outer cover layer (130).

3. The wind turbine blade reinforcement tube structure according to claim 2, characterized in that, The thermosensitive color-changing layer (200) is disposed between the reinforcing layer (120) and the outer cover layer (130).

4. The wind turbine blade reinforcement tube structure according to claim 3, characterized in that, The thermochromic layer (200) is applied to the outer surface of the reinforcing layer (120) by spraying, printing or hot pressing.

5. The wind turbine blade reinforcement tube structure according to claim 1, characterized in that, The thermosensitive color-changing layer (200) is embedded inside the outer cover layer (130).

6. The wind turbine blade reinforcement tube structure according to claim 5, characterized in that, The thermochromic layer (200) and the outer coating layer (130) are formed into the reinforced tube structure by multi-layer co-extrusion.

7. The wind turbine blade reinforcement tube structure according to any one of claims 1 to 6, characterized in that, The thermochromic layer (200) is a reversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer (200) 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 (200) changes from the second color to the first color.

8. The wind turbine blade reinforcement tube structure according to any one of claims 1 to 6, characterized in that, The thermochromic layer (200) is an irreversible thermochromic layer. When the surface temperature of the area covered by the thermochromic layer (200) 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 (200) remains the second color.

9. The wind turbine blade reinforcement tube structure according to any one of claims 1 to 6, characterized in that, The preset threshold is any temperature value within the range of 40℃ to 100℃.

10. The wind turbine blade reinforcement tube structure according to any one of claims 1 to 6, characterized in that, The reinforcing layer (120) is a steel wire structure.

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