Wind turbine blade ohmic tube structure

Abstract

The application discloses a wind power generation blade ohmic tube structure, wherein the wind power generation blade ohmic tube structure comprises an ohmic tube and a temperature-sensitive color-changing layer, the ohmic tube is internally provided with a flow guide cavity, a flow guide opening in communication with the flow guide cavity is formed in the side wall of the ohmic tube, and the temperature-sensitive color-changing layer is arranged on the outer surface of the ohmic tube or embedded in the interior of the ohmic tube. The temperature-sensitive color-changing layer is configured to change color under the change of temperature, is used for monitoring local temperature abnormity of the ohmic tube in the vacuum infusion process of the wind power generation blade, and changes from a first color to a second color when the temperature in the coverage area of the temperature-sensitive color-changing layer exceeds a preset threshold value, and the first color and the second color are different. The technical scheme provided by the application can comprehensively and real-timely monitor the temperature of the ohmic tube on the wind power generation blade, can accurately capture the local heat release concentration problem caused by resin accumulation, avoids over-burning of the glass steel due to temperature out of control, thereby reduces the risk of blade scrapping, and guarantees the quality of the blade.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to an ohmic tube structure for wind power generation blades. Background Technology

[0002] In the vacuum infusion process of wind turbine blades, the ohmic tube, as a core flow guiding component, plays a crucial role in delivering resin to the blade's flow guiding mesh, and its performance directly affects the resin distribution and infusion quality.

[0003] In existing technologies, during the resin flow process in the ohmic tube, localized heat release can easily occur due to resin accumulation inside, leading to abnormally high temperatures. This can cause the fiberglass to overheat and turn white, severely affecting blade strength and even causing it to be scrapped. Currently, the industry uses external equipment such as thermal imagers for temperature monitoring, but such equipment cannot fully cover the ohmic tubes on the blade surface, resulting in monitoring blind spots. Consequently, wind turbine blade manufacturing still faces high quality risks and production costs. Utility Model Content

[0004] The purpose of this application is to provide an ohmic tube structure for wind turbine blades, which can provide comprehensive and real-time temperature monitoring of the ohmic tubes on the wind turbine blades. This can accurately detect the problem of local heat concentration caused by resin accumulation, avoid overheating and whitening of fiberglass due to temperature runaway, thereby reducing the risk of blade scrapping and ensuring blade quality.

[0005] This utility model provides an ohmic tube structure for wind turbine blades, comprising: An ohmic tube has a flow guiding cavity inside, and a flow guiding port communicating with the flow guiding cavity is opened on the side wall of the ohmic tube. The flow guiding port is used to inject resin into the flow guiding mesh of the wind turbine blade. A thermosensitive color-changing layer is disposed on the outer surface of the ohm tube or embedded inside the ohm tube; The thermochromic layer is configured to change color in response to temperature changes, and is used to monitor local temperature anomalies in the ohmic tube 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 ohmic tube structure, by incorporating a temperature-sensitive color-changing layer, provides real-time, visualized temperature monitoring during blade heating and curing or maintenance. The color-changing layer can cover the entire ohmic tube 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), allowing operators to visually observe the color change. This enables comprehensive, real-time temperature monitoring of the ohmic tube on the wind turbine blade, accurately detecting localized heat accumulation caused by resin buildup, preventing overheating and whitening of the fiberglass due to temperature runaway, thus reducing the risk of blade failure and ensuring blade quality.

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

[0008] Meanwhile, using this ohmic tube structure for temperature monitoring eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the ohmic tube 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 ohmic tube structure simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0009] Furthermore, the usage of this ohmic tube structure is basically the same as that of ordinary ohmic tubes, 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 ohmic tube itself, resulting in minimal process modifications and easy large-scale deployment.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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 filling process of wind turbine blades. 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 filling process or adjusting the layout of the ohmic tube.

[0014] In one optional implementation, the preset threshold is any temperature value within the range of 40℃ to 100℃.

[0015] Beneficial effects: The exothermic peak and curing temperature of the resin used for wind turbine blade infusion vary (e.g., 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 temperature-sensitive color-changing layer can accurately respond to the critical temperature in specific scenarios.

[0016] In one alternative embodiment, the thermochromic layer is disposed on the outer surface of the ohmic tube.

[0017] Beneficial effects: By placing the thermosensitive color-changing layer on the outer surface of the ohm tube, it can be directly exposed to the operator's field of vision. The color change can be observed with the naked eye without disassembly or the use of additional tools, which can detect local temperature anomalies in the first place and buy time for timely cooling measures (such as local water spraying, adjusting heating parameters, etc.). It is especially suitable for the rapid response requirements in the large-scale production of wind turbine blades.

[0018] In one alternative embodiment, the thermochromic layer is applied to the outer surface of the ohmic tube by spraying, printing, or hot-pressing.

[0019] Beneficial effects: Spraying, printing, and hot-pressing are all mature surface treatment processes that do not require significant modifications to the original structure of the ohmic tube (such as the flow guide cavity and flow guide port). They can be directly integrated into the existing ohmic tube production process, lowering the barrier to technology implementation. Regardless of the material of the ohmic tube, such as plastic or composite materials, stable adhesion can be achieved through spraying, printing, and hot-pressing processes, demonstrating wide adaptability.

[0020] In one alternative embodiment, the wind turbine blade ohmic tube structure further includes a protective layer covering the outer surface of the thermochromic layer.

[0021] Beneficial effects: By covering the outer surface of the thermochromic layer with a protective layer, the erosion and damage to the thermochromic layer caused by external environmental factors such as dust, resin splashes, and mechanical friction can be effectively isolated. During the filling process of wind turbine blades, the ohmic tube may come into contact with resin, molds, or tools. The protective layer can prevent the thermochromic layer from being scratched, contaminated, or chemically corroded, ensuring that it maintains stable temperature response performance even after repeated use and reducing the loss of monitoring function due to the failure of the thermochromic layer.

[0022] In one optional embodiment, the thermochromic layer and the ohmic tube are formed into an ohmic tube structure by multi-layer co-extrusion, and the thermochromic layer is embedded in the ohmic tube.

[0023] Beneficial effects: The multi-layer co-extrusion process integrates the thermochromic layer and the ohmic tube into a single structure. This embedded design avoids the mechanical friction, chemical corrosion (such as resin splashing), or environmental aging that could occur with the exposed thermochromic layer, ensuring long-term stability of its temperature response performance. Especially during the grouting process of wind turbine blades, the ohmic tube needs to withstand certain pressures and operational impacts; this embedded structure significantly extends its service life and reduces the frequency of maintenance and replacement.

[0024] In one optional embodiment, the ohmic tube includes a pipe body and two support plates, the two support plates being disposed on opposite sides of the pipe body and extending along the length of the pipe body.

[0025] Beneficial effects: The two opposing support plates extend along the length of the pipe body, which can increase the contact area between the ohmic tube and the guide net, enhance the support strength of the ohmic tube during the injection process, avoid positional displacement or tilting caused by resin flow impact or external operation collision, ensure that the guide port is always accurately aligned with the guide net, and ensure the stability of the resin injection path.

[0026] In one alternative embodiment, the pipe body is arc-shaped.

[0027] Beneficial effects: The arc-shaped pipe body has no right angles or sharp edges inside, which can reduce the resistance and eddies when the resin flows in the guide cavity, allowing the resin to pass through the guide cavity more smoothly and be discharged from the guide port. This reduces the risk of resin accumulation caused by sudden changes in local flow velocity, indirectly reducing the possibility of concentrated heat release. Combined with the temperature monitoring function of the thermosensitive color-changing layer, it is more conducive to ensuring the uniformity of injection. 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 schematic diagram of the structure of the ohmic tube of a wind turbine blade in one embodiment provided in this application; Figure 2 This is a cross-sectional view of an ohmic tube structure for a wind turbine blade according to one embodiment provided in this application; Figure 3 This is a cross-sectional view of the ohmic tube structure of a wind turbine blade in another embodiment provided in this application.

[0030] Explanation of reference numerals in the attached figures: 100. Ohmic tube; 110. Flow guide cavity; 120. Flow guide port; 130. Pipe body; 140. Support plate; 200. Thermochromic layer; 300. Protective layer. Detailed Implementation

[0031] In existing technologies, during the resin flow process in the ohmic tube, localized heat release can easily occur due to resin accumulation inside, leading to abnormally high temperatures. This can cause the fiberglass to overheat and turn white, severely affecting blade strength and even causing it to be scrapped. Currently, the industry uses external equipment such as thermal imagers for temperature monitoring, but such equipment cannot fully cover the ohmic tubes on the blade surface, resulting in monitoring blind spots. Consequently, wind turbine blade manufacturing still faces high quality risks and production costs.

[0032] To address this issue and reduce the blind spots in monitoring the surface temperature of the ohmic tube during wind turbine blade manufacturing, the inventors of this application have installed numerous sensors around the ohmic tube to monitor its temperature. Because wind turbine blades are relatively large, a large number of sensors are required, increasing production costs and equipment maintenance complexity.

[0033] Based on this, the inventors of this application have redesigned the ohmic tube structure of wind turbine blades. By setting a temperature-sensitive color-changing layer on the ohmic tube, a real-time, visualized temperature monitoring method can be provided during blade heating and curing or maintenance heating. The temperature-sensitive color-changing layer can cover the entire ohmic tube or a part of it, allowing the covered area to be used to monitor local temperature anomalies in the ohmic tube during vacuum filling of the wind turbine blade. Once the surface temperature of the area covered by the temperature-sensitive color-changing layer exceeds a preset threshold, the color changes from the first color to the second color (e.g., from light to dark). Operators can visually see the color-changing area, achieving comprehensive and real-time temperature monitoring of the ohmic tube on the wind turbine blade. This accurately detects localized heat concentration caused by resin accumulation, preventing overheating and whitening of the fiberglass due to temperature runaway, thereby reducing the risk of blade scrapping and ensuring blade quality.

[0034] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This ohmic tube structure 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, using this ohmic tube structure for temperature monitoring eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the ohmic tube 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 ohmic tube structure simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0036] Furthermore, the usage of this ohmic tube structure is basically the same as that of ordinary ohmic tubes, 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 ohmic tube itself, resulting in minimal process modifications and easy large-scale deployment.

[0037] 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.

[0038] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0039] According to embodiments of the present invention, on the one hand, such as Figures 1 to 3 An ohmic tube structure for wind turbine blades is provided, comprising an ohmic tube 100 and a thermochromic layer 200.

[0040] Specifically, such as Figure 1 As shown, the ohmic tube 100 is provided with a flow guiding cavity 110, wherein a flow guiding port 120 is provided on the side wall of the ohmic tube 100, the flow guiding port 120 is connected to the flow guiding cavity 110, the flow guiding cavity 110 is used to guide the resin so that the resin flows along the extension direction of the ohmic tube 100, and the resin in the flow guiding cavity 110 is injected into the flow guiding net of the wind turbine blade through the flow guiding port 120.

[0041] Specifically, such as Figure 2 and Figure 3 As shown, the thermo-sensitive color-changing layer 200 is disposed on the outer surface of the ohm tube 100, or the thermo-sensitive color-changing layer 200 can be embedded inside the ohm tube 100.

[0042] Specifically, the thermochromic layer 200 is configured to change color in response to temperature changes. The thermochromic layer 200 is used to monitor local temperature anomalies in the ohm tube 100 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.

[0043] This wind turbine blade ohmic tube structure, by incorporating a thermosensitive color-changing layer 200 on the ohmic tube 100, provides real-time, visualized temperature monitoring during blade heating and curing or maintenance. The thermosensitive color-changing layer 200 can cover the entire ohmic tube 100 or a portion thereof, allowing the covered area to monitor localized temperature anomalies during vacuum infusion of the ohmic tube 100. 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 change. This enables comprehensive, real-time temperature monitoring of the ohmic tube 100 on the wind turbine blade, accurately detecting localized heat accumulation caused by resin buildup, preventing overheating and whitening of the fiberglass due to temperature runaway, thus reducing the risk of blade failure and ensuring blade quality.

[0044] During vacuum infusion and curing, the exothermic reaction of the resin can easily lead to localized overheating. This Ohm tube 100 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.

[0045] Meanwhile, temperature monitoring using the Ohm Tube 100 structure eliminates the need for complex equipment installation and debugging. Operators can determine the temperature of the Ohm Tube 100 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 Ohm Tube 100 structure simplifies the operation process and reduces equipment procurement, installation, and maintenance costs.

[0046] Furthermore, the usage of this ohmic tube 100 structure is basically the same as that of a regular ohmic tube 100, requiring no changes to the vacuum extraction, laying method, or curing process. Only a thermosensitive color-changing layer 200 needs to be added to the multi-layered structure of the ohmic tube 100 itself, resulting in minimal process modifications and easy large-scale deployment.

[0047] Specifically, the ohmic tube 100 has a flow guide cavity 110 (a channel for resin flow) inside, and a flow guide port 120 communicating with the flow guide cavity 110 is opened on the side wall. Resin is injected into the flow guide net of the blade through the flow guide port 120 to ensure that the resin is uniformly impregnated in the blade mold. The ohmic tube 100 can be of any shape, and in this embodiment, the shape of the ohmic tube 100 is not specifically limited.

[0048] 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.

[0049] Specifically, the thermochromic layer 200 can be deposited on the outer surface of the ohmic tube 100. The outer surface of the ohmic tube 100 can be entirely covered by the thermochromic layer 200, or only partially covered. In this embodiment, there are no specific limitations on the size of the thermochromic layer 200 and the ohmic tube 100. Alternatively, the thermochromic layer 200 can be embedded within the ohmic tube 100.

[0050] It should be noted that the first color and the second color are different. The first color represents the color of the ohmmeter 100 under normal temperature conditions, while the second color represents the color of the ohmmeter 100 when the temperature exceeds a preset threshold. In actual production, if the thermochromic layer 200 of the ohmmeter 100 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 thermochromic 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 ohmmeter 100 are overheating without the need for additional complex equipment or data analysis.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Specifically, wind turbine blade production is typically large-scale and continuous. The reversible temperature-sensitive chromatic 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, if a production line produces multiple wind turbine blades daily, using an irreversible chromatic ohmmeter 100 would require replacing it every time, resulting in high costs. The reversible chromatic ohmmeter 100, however, can be reused repeatedly; ensuring its stable performance allows it to continuously serve production.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 a preset threshold, the color of the area covered by the thermochromic layer 200 remains the second color.

[0060] 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 filling process of wind turbine blades. 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 filling process or adjusting the layout of the Ohm tube 100.

[0061] The preset threshold temperature for reversible color-changing layers is generally between 50°C and 80°C. If the temperature of the ohmmeter 100 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 ohmmeter 100 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 ohmmeter 100 from overheating locally.

[0062] 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.

[0063] In one embodiment, the preset threshold is any temperature value within the range of 40℃ to 100℃.

[0064] 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 200 can accurately respond to the critical temperature in specific scenarios.

[0065] 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.

[0066] In one embodiment, such as Figure 3 As shown, the thermochromic layer 200 is disposed on the outer surface of the ohmic tube 100.

[0067] Thermosensitive color-changing layer 200 is placed on the outer surface of ohmic tube 100, which can be directly exposed to the operator's field of vision. The color change can be observed with the naked eye without disassembly or the use of additional tools. This allows for the immediate detection of local temperature anomalies, giving time to take timely cooling measures (such as local water spraying, adjusting heating parameters, etc.). It is especially suitable for the rapid response requirements in the large-scale production of wind turbine blades.

[0068] Compared to embedding it inside the ohm tube 100, the thermosensitive color-changing layer 200 on the outer surface can be achieved through processes such as spraying and coating, which is simpler to prepare and has less impact on the original structure of the ohm tube 100 (such as the flow guide cavity 110 and the flow guide port 120), making it easier to be compatible with existing ohm tube 100 manufacturing processes. If the color-changing layer experiences localized wear or failure, the surface can be repaired by recoating separately, reducing maintenance costs and operational complexity.

[0069] Meanwhile, the thermosensitive color-changing layer 200 is set on the outer surface without occupying the space of the flow guiding cavity 110 inside the ohm tube 100, nor affecting the resin injection path of the flow guiding port 120. It can ensure the temperature monitoring function while fully preserving the core flow guiding performance of the ohm tube 100, avoiding problems such as resin flow obstruction and uneven distribution caused by internal structural changes, and ensuring the stability of the injection process.

[0070] In one embodiment, the thermochromic layer 200 is applied to the outer surface of the ohm tube 100 by spraying, printing or hot pressing.

[0071] Spraying, printing, and hot-pressing are all mature surface treatment processes that do not require significant modifications to the existing structure of the ohmic tube 100 (such as the flow guide cavity 110 and the flow guide port 120). They can be directly integrated into the existing ohmic tube 100 production process, lowering the barrier to technology implementation. The ohmic tube 100, regardless of whether it is made of plastic or composite materials, can achieve stable adhesion through spraying, printing, and hot-pressing processes, demonstrating wide applicability.

[0072] 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.

[0073] In one embodiment, such as Figure 3 As shown, the ohmic tube structure of the wind turbine blade also includes a protective layer 300, which is applied to the outer surface of the thermosensitive color-changing layer 200.

[0074] By covering the outer surface of the thermochromic layer 200 with a protective layer 300, the corrosion and damage to the thermochromic layer 200 caused by external environmental factors such as dust, resin splashes, and mechanical friction can be effectively isolated. During the filling process of wind turbine blades, the ohm tube 100 may come into contact with resin, molds, or tools. The protective layer 300 can prevent the thermochromic layer 200 from being scratched, contaminated, or chemically corroded, ensuring that it maintains stable temperature response performance during repeated use and reducing the loss of monitoring function due to the failure of the thermochromic layer.

[0075] The protective layer 300 enhances the bonding strength between the temperature-sensitive color-changing layer 200 and the outer surface of the ohmic tube 100, preventing the color-changing layer from falling off during transportation, installation, or grouting operations. Simultaneously, its temperature resistance and aging resistance properties are adaptable to temperature variations during wind turbine blade manufacturing (such as the medium-to-high temperature environment during the curing stage), ensuring the stability of the entire structure under complex process conditions.

[0076] Specifically, the protective layer 300 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 300.

[0077] In one embodiment, such as Figure 2 As shown, the thermochromic layer 200 and the ohmic tube 100 are formed into the ohmic tube 100 structure through multi-layer co-extrusion, and the thermochromic layer 200 is embedded in the ohmic tube 100.

[0078] The multi-layer co-extrusion process integrates the thermochromic layer 200 and the ohmic tube 100 into a single structure. This embedded design avoids the mechanical friction, chemical corrosion (such as resin splashing), or environmental aging that could affect the exposed thermochromic layer, ensuring long-term stability of its temperature response performance. Especially during the grouting process of wind turbine blades, the ohmic tube 100 needs to withstand certain pressures and operational impacts; this embedded structure significantly extends its service life and reduces the frequency of maintenance and replacement.

[0079] The thermochromic layer 200 is embedded inside the ohm tube 100, with a shorter heat conduction path to the ohm tube 100. This allows for faster and more direct sensing of local temperature changes in the ohm tube 100 caused by resin accumulation, reducing interference from external environments (such as airflow and light) on temperature monitoring, ensuring the correspondence between color changes and the actual temperature of the ohm tube 100, and improving early warning accuracy.

[0080] In one embodiment, such as Figure 1 As shown, the ohmic tube 100 includes a pipe body 130 and a support plate 140. There are two support plates 140, which are arranged on opposite sides of the pipe body 130 and extend along the length of the pipe body 130.

[0081] Two opposing support plates 140 extend along the length of the pipe body 130, which can increase the contact area between the ohmic tube 100 and the guide net, enhance the support strength of the ohmic tube 100 during the injection process, avoid positional displacement or tilting caused by resin flow impact or external operation collision, ensure that the guide port 120 is always accurately aligned with the guide net, and ensure the stability of the resin injection path.

[0082] The support plate 140 can provide lateral reinforcement to the pipe body 130, reduce pipe deformation caused by internal resin pressure, and ensure the unobstructed flow of the guide cavity 110. At the same time, the fit between the support plate 140 and the mold surface can help fix the flow channel space, guide the resin to be evenly distributed along the preset path, avoid local accumulation, and indirectly reduce the risk of local heat release caused by resin retention.

[0083] In one embodiment, such as Figure 1 As shown, the pipe body 130 is arc-shaped.

[0084] The arc-shaped pipe body 130 has no right angles or sharp edges inside, which can reduce the resistance and eddies when the resin flows in the guide cavity 110, allowing the resin to pass through the guide cavity 110 more smoothly and be discharged from the guide port 120. This reduces the risk of resin accumulation caused by sudden changes in local flow velocity and indirectly reduces the possibility of concentrated heat release. Combined with the temperature monitoring function of the temperature-sensitive color-changing layer 200, it is more conducive to ensuring the uniformity of injection.

[0085] Specifically, the arc-shaped structure has stronger resistance to deformation compared to the straight or angular structure, and can better withstand the internal pressure and external operational impact during the resin injection process. It reduces the damage or cracking of the pipe body 130 caused by uneven stress, and extends the service life of the ohm tube 100. It is especially suitable for the high-pressure environment during the injection of large wind turbine blades.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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. An ohmic tube structure for wind turbine blades, characterized in that, include: An ohmic tube (100) is provided with a flow guide cavity (110) inside. The side wall of the ohmic tube (100) is provided with a flow guide port (120) that communicates with the flow guide cavity (110). The flow guide port (120) is used to inject resin into the flow guide net of the wind turbine blade. A thermochromic layer (200) is disposed on the outer surface of the ohm tube (100) or embedded inside the ohm tube (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 ohm tube (100) 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.

2. The ohmic tube structure for wind turbine blades according to claim 1, 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.

3. The ohmic tube structure for wind turbine blades according to claim 1, 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.

4. The ohmic tube structure for wind turbine blades according to claim 1, characterized in that, The preset threshold is any temperature value within the range of 40℃ to 100℃.

5. The ohmic tube structure for wind turbine blades according to any one of claims 1 to 4, characterized in that, The thermosensitive color-changing layer (200) is disposed on the outer surface of the ohmic tube (100).

6. The ohmic tube structure for wind turbine blades according to claim 5, characterized in that, The thermosensitive color-changing layer (200) is applied to the outer surface of the ohmic tube (100) by spraying, printing or hot pressing.

7. The ohmic tube structure for wind turbine blades according to claim 5, characterized in that, The wind turbine blade ohmic tube structure also includes a protective layer (300), which is applied to the outer surface of the thermosensitive color-changing layer (200).

8. The ohmic tube structure for wind turbine blades according to any one of claims 1 to 4, characterized in that, The thermochromic layer (200) and the ohmic tube (100) are formed into an ohmic tube (100) structure by multi-layer co-extrusion, and the thermochromic layer (200) is embedded in the ohmic tube (100).

9. The ohmic tube structure for wind turbine blades according to any one of claims 1 to 4, characterized in that, The ohmic tube (100) includes a pipe body (130) and two support plates (140). The two support plates (140) are located on opposite sides of the pipe body (130) and extend along the length of the pipe body (130).

10. The ohmic tube structure for wind turbine blades according to claim 9, characterized in that, The pipe body (130) is arc-shaped.

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