Surface acoustic wave sensor, wind driven generator blade and wind driven generator
By installing oil-proof components and a sealing connection layer inside the mounting cavity of the wind turbine blade, the problem of lubricating grease seeping into the surface acoustic wave sensor is solved, achieving safe protection of the sensor and accurate signal acquisition.
Patent Information
- Application Number
- CN202522428667.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-11-17
AI Technical Summary
During operation, lubricating grease can easily seep into the surface acoustic wave sensor through the gaps in the sensor probe, causing damage to the sensor and posing safety hazards such as arcing and overheating of the equipment. Traditional detection methods cannot meet the requirements for real-time and accurate detection.
An oil-proof component is installed inside the mounting cavity of the wind turbine blade, and the sensor body is housed in the oil-proof groove and fixed by a sealing connection layer to form a physical barrier and sealing structure to prevent grease from seeping into the sensor.
It effectively prevents lubricating grease from contacting the sensor probe, avoiding sensor damage caused by grease seepage, and ensuring the safe operation of wind turbine blades and the quality of signal acquisition.
Smart Images
Figure CN223710669U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to wind power generation technical field especially relates to a surface acoustic wave sensor, wind turbine blade and wind driven generator. BACKGROUND
[0002] With the development of global clean energy industry, the installed capacity of wind power generation is continuously expanding, and as the core component, the wind turbine blade is affected by the complex environment in the wild for a long time, and faults such as lightning carbonization and natural erosion cracking occur frequently. If such faults are not detected and repaired in time, not only will it lead to a significant decrease in power generation efficiency, but also may cause safety accidents such as blade fracture, resulting in high maintenance cost and safety threat. Traditional manual detection needs to stop, is low in efficiency and depends on experience, video detection is easy to be disturbed by environment and unstable in precision, and all of them cannot meet the real-time and accurate detection requirements.
[0003] In order to solve the problems of traditional detection methods, the detection technology based on surface acoustic wave has become a research hotspot because it can accurately capture the fault characteristics of the blade. Generally, the sensing probe of the surface acoustic wave sensor needs to be close to the surface or inside of the blade to effectively collect signals, so as to ensure stable power supply and signal collection quality.
[0004] However, there are usually a lot of lubricating oil inside the wind power blade and hub, and when the surface acoustic wave sensor collects signals, the sensing probe needs to be tightly attached to the inner surface of the blade. When the wind turbine is running, the blade rotates, and the oil inside the blade will flow to the sensor. If the oil seeps into the sensor through the gap of the sensing probe, the sensor may be damaged, and in severe cases, it may cause circuit sparking and high temperature of the equipment, which poses a threat to the wind turbine blade. UTILITY MODEL CONTENTS
[0005] The main purpose of the utility model is to provide a surface acoustic wave sensor, a wind turbine blade and a wind driven generator, which can prevent oil from seeping into the sensor through the gap of the sensing probe and causing damage to the sensor.
[0006] To achieve the above purpose, the surface acoustic wave sensor provided by the utility model is arranged in the mounting cavity of the wind turbine blade, and comprises:
[0007] The oil-proof piece is connected with the cavity wall of the mounting cavity on the side away from the oil-proof groove.
[0008] The sensor body comprises a main body and a sensing probe, the main body is contained in the oil-proof groove, the main body is provided with a mounting groove on the side facing the groove bottom wall of the oil-proof groove, and the sensing probe is arranged in the main body and contained in the mounting groove; and
[0009] A sealing connecting layer is arranged between the sensing probe and the bottom wall of the oil-proof groove, and is used for fixing the oil-proof member and the sensing probe and sealing the mounting groove.
[0010] In an embodiment, the oil-proof member comprises a mounting seat, a first flange and a first flow guide part, the mounting seat is provided with the oil-proof groove on one side thereof; the edge of the mounting seat is provided with the first flange close to the slot of the oil-proof groove; one end of the first flow guide part is arranged on the first flange, and the other end of the first flow guide part away from the mounting seat is sealingly abutted against the inner wall of the mounting cavity.
[0011] In an embodiment, the first flow guide part is arranged obliquely relative to the first flange, and the other end of the first flow guide part away from the mounting seat extends in a direction away from the bottom wall of the oil-proof groove.
[0012] In an embodiment, the oil-proof member further comprises a second flow guide part, the second flow guide part is arranged on the first flange and arranged obliquely relative to the first flange, and the other end of the second flow guide part away from the first flange extends in a direction close to the bottom wall of the oil-proof groove; the second flow guide part is used for guiding the oil flowing to the slot of the oil-proof groove to move in a direction away from the oil-proof groove.
[0013] In an embodiment, the oil-proof member further comprises a second flange, the second flange is arranged on the bottom wall of the oil-proof groove; and the other end of the second flange away from the bottom wall of the oil-proof groove is in abutting contact with the main body.
[0014] In an embodiment, the sealing connecting layer is a polyurethane adhesive layer or an epoxy resin adhesive layer.
[0015] In an embodiment, the oil-proof member is a glass steel base; and / or
[0016] The sensing probe is a glass steel probe.
[0017] The utility model also provides a wind driven generator blade, which comprises:
[0018] A paddle body, an installation cavity is formed in the paddle body; and
[0019] The surface acoustic wave sensor is accommodated in the installation cavity; and
[0020] A connecting layer is arranged between the oil-proof member and the cavity wall of the installation cavity, and is used for fixing the oil-proof member and the paddle body.
[0021] In an embodiment, the connecting layer is a polyurethane adhesive layer or an epoxy resin adhesive layer.
[0022] The utility model also provides a wind driven generator, including the wind driven generator blade as above-mentioned.
[0023] The surface acoustic wave sensor provided by the utility model is arranged in the installation cavity of the wind driven generator blade, and the oil-proof piece, the sealing connection layer and the sensor body arranged in the oil-proof groove can solve the problem of the lubricating grease of the blade root part seeping into the sensor from the gap of the sensing probe. Specifically, the oil-proof groove is arranged on one side of the oil-proof piece of the surface acoustic wave sensor, and the oil-proof groove provides a containing space for the sensor body. The main body of the sensor body is arranged in the oil-proof groove, and an installation groove is arranged on the side of the groove bottom wall of the oil-proof groove, facing the oil-proof groove. The sensing probe is arranged on the main body and arranged in the installation groove, so that the sensing probe can be accurately directed towards the direction of the groove bottom wall of the oil-proof groove. At the same time, the sealing connection layer is arranged between the sensing probe of the sensor body and the groove bottom wall of the oil-proof groove. On the one hand, the oil-proof piece and the sensor body can be fixed, and the sensing probe can be connected to the groove bottom wall of the oil-proof groove through the sealing connection layer. When the wind driven generator is running and the blade is rotating, the lubricating grease inside the hub and the blade flows to the sensor from multiple directions. The oil-proof groove structure of the oil-proof piece first forms a physical barrier to block the direct contact of the grease with the sensor body and the sensing probe. Even if a small amount of grease tries to approach, it is also difficult to break through the surrounding protection of the oil-proof groove, so as to avoid the seepage of the grease along the gap of the sensing probe into the inside of the sensor. On the other hand, the sealing connection layer can further prevent the grease from entering the installation groove. Therefore, the surface acoustic wave sensor provided by the utility model can effectively block the contact of the lubricating grease with the sensing probe, avoid the damage of the sensor caused by the seepage of the grease, and further eliminate the safety hazards such as circuit sparking and high temperature of the equipment, so as to ensure the safe operation of the wind driven generator blade. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in the drawings without creating any creative labor.
[0025] Figure 1 The structure schematic view of one embodiment of the surface acoustic wave sensor provided by the utility model is shown in the figure.
[0026] Figure 2 The structure schematic view of another embodiment of the surface acoustic wave sensor provided by the utility model is shown in the figure.
[0027] Figure 3 The sectional view of the wind driven generator blade provided by the utility model is shown in the figure.
[0028] Figure 4A structure schematic view of a fourth embodiment of the surface acoustic wave sensor provided by the utility model.
[0029] Explanation of reference numerals:
[0030] 100, surface acoustic wave sensor; 1, oil-proof piece; 11, mounting seat; 111, oil-proof groove; 12, first flange; 13, first flow guide part; 14, second flow guide part; 15, second flange; 2, sensor body; 21, sensing probe; 22, main body; 3, sealing connection layer; 200, paddle body; 4, mounting cavity; 300, connection layer; 1000, wind turbine blade.
[0031] The implementation, functional features and advantages of the utility model will be further described in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0033] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.
[0034] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, taking "A and / or B" as an example, including A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the utility model.
[0035] The utility model provides a kind of surface acoustic wave sensor 100, is located in the mounting cavity 4 of wind turbine blade 1000.
[0036] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 In an embodiment, the surface acoustic wave sensor 100 comprises:
[0037] The oil-proof piece 1 is provided with an oil-proof groove 111 on one side thereof, and the side of the oil-proof piece 1 away from the oil-proof groove 111 is connected with the cavity wall of the installation cavity 4;
[0038] The sensor body 2 comprises a main body 22 and a sensing probe 21, the main body 22 is contained in the oil-proof groove 111, the side of the main body 22 facing the groove bottom wall of the oil-proof groove 111 is provided with an installation groove, and the sensing probe 21 is arranged in the main body and contained in the installation groove; and
[0039] The sealing connection layer 3 is arranged between the sensing probe 21 and the groove bottom wall of the oil-proof groove 111, and is used for fixing the oil-proof piece 1 and the sensing probe 21 and sealing the installation groove.
[0040] It should be noted that, please refer to Figure 3 The inside of the blade body 200 of the wind turbine blade 1000 is pre-formed with an installation cavity 4, and the surface acoustic wave sensor 100 is assembled in the installation cavity 4 by a fixing or bonding manner and arranged close to the blade root.
[0041] The oil-proof piece 1 is a core protection component for preventing grease from penetrating into the sensor, and needs to have excellent oil resistance and aging resistance in material selection. High polymer materials such as fluororubber and polytetrafluoroethylene can be generally used. Such materials not only resist long-term erosion of lubricating grease at the blade root position, but also adapt to temperature fluctuations and humidity changes of field wind turbines, avoiding structural failure caused by environmental factors. From the shape structure, the oil-proof piece 1 can be designed as a block or plate structure, one side of which is recessed to form an oil-proof groove 111. The shape of the oil-proof groove 111 needs to be adapted to the subsequent sensor body 2, which is generally a rectangular, circular or special-shaped groove structure matching the profile of the sensor body 2. The depth of the groove body needs to ensure that the sensor body 2 is completely contained therein, and the top surface of the sensor body 2 does not exceed the surface of the oil-proof piece 1, forming a semi-enclosed physical protection space. At the same time, the inner wall of the oil-proof groove 111 needs to be smooth and free of obvious gaps, further reducing the possibility of grease adhesion and penetration. Through this structural design, the oil-proof piece 1 can directly block the flowing lubricating grease outside from contacting the sensing probe 21, and build a first protective barrier for the sensing probe 21. In addition, the top of the oil-proof groove 111 is not closed, which can retain the expansion capability of collecting air sound.
[0042] The sensor body 2 is the core functional component for collecting paddle failure features, and its material composition needs to consider signal conduction performance and structural stability. The main body 22 usually uses piezoelectric ceramic material as the core element for surface acoustic wave excitation and reception. Piezoelectric ceramic material has excellent electromechanical conversion efficiency and can accurately convert the vibration signal of the paddle into an electrical signal. At the same time, the outside is wrapped with a layer of wear-resistant insulating material, such as an aluminum oxide ceramic coating, to protect the internal piezoelectric element from minor mechanical impact and environmental erosion. In terms of shape and structure, the main body 22 is generally designed as a thin sheet or small block structure, and the overall size needs to match the oil-proof groove 111 of the oil-proof piece 1 to ensure that it can be completely and tightly contained in the oil-proof groove 111. The side of the main body 22 in contact with the bottom wall of the oil-proof groove 111 needs to be flat to ensure stable fixation through the subsequent sealing connection layer 3. At the same time, the sensing probe 21 of the sensor body 2 for signal collection needs to be set towards the bottom of the oil-proof groove 111 and tightly adhere to the bottom of the oil-proof groove 111 to ensure that the surface acoustic wave signal can be efficiently conducted to the inside of the sensor and accurately capture the failure feature signals such as lightning carbonization and natural erosion cracking of the paddle.
[0043] The sealing connection layer 3 has the dual functions of fixing the oil-proof piece 1 and the sensing probe 21 and filling the gap. In terms of material selection, it needs to meet the requirements of adhesive strength, sealing performance and oil resistance. Generally, epoxy high-temperature and oil-resistant adhesive can be used. This type of adhesive can form a high-strength adhesive structure after curing, ensuring that the sensor body 2 and the bottom wall of the oil-proof groove 111 will not be displaced due to the centrifugal force generated by the high-speed rotation of the paddle. At the same time, the adhesive layer formed after curing has good sealing performance, which can fill the possible small gaps between the sensor body 2 and the bottom wall of the oil-proof groove 111, preventing lubricating oil from seeping into the inside of the sensor body 2. In terms of structure, the sealing connection layer 3 is a thin film structure uniformly filled between the sensor body 2 and the bottom wall of the oil-proof groove 111. The thickness of the adhesive layer needs to be controlled within a range that can ensure sufficient adhesion and fixation without causing the distance between the sensor body 2 and the paddle surface to be too large, which would affect the signal collection range. Through this structural design, the sealing connection layer 3 not only stably fixes the sensor body 2 in the oil-proof groove 111, ensuring that the sensing probe 21 always maintains close contact with the solid surface of the paddle and guarantees the quality of signal collection, but also further seals possible gaps and forms a double protection structure with the oil-proof groove 111 of the oil-proof piece 1, eliminating the risk of oil seeping into the inside of the sensor.
[0044] The oil-proof piece 1, the sealing connection layer 3 and the sensor body 2 accommodated therein are adopted, the problem that the lubricating grease at the root part of the blade seeps into the sensor from the gap of the sensing probe 21 can be solved. Specifically, the oil-proof piece 1 of the surface acoustic wave sensor 100 is provided with an oil-proof groove 111 on one side, which provides a containing space for the sensor body 2; the main body 22 of the sensor body 2 is accommodated in the oil-proof groove 111, and an installation groove is formed on the side of the main body 22 facing the groove bottom wall of the oil-proof groove 111, the sensing probe 21 is arranged on the main body 22 and accommodated in the installation groove, so that the sensing probe 21 can be accurately directed to the direction of the groove bottom wall of the oil-proof groove 111, and the sealing connection layer 3 is arranged between the sensing probe 21 of the sensor body 2 and the groove bottom wall of the oil-proof groove 111. On the one hand, the oil-proof piece 1 and the sensor body 2 can be fixed, and the sensing probe 21 can be stably connected with the groove bottom wall of the oil-proof groove 111 through the sealing connection layer 3. When the wind turbine is running and the blade is rotating, the lubricating grease inside the hub and the blade flows to the sensor from multiple directions, the oil-proof groove 111 structure of the oil-proof piece 1 first forms a physical barrier to block the direct contact of the grease with the sensor body 2 and the protruding sensing probe 21. Even if a small amount of grease tries to approach, it is also difficult to break through the surrounding protection of the oil-proof groove 111, avoiding the seepage of the grease into the sensor through the gap of the sensing probe 21. On the other hand, the sealing connection layer 3 can further prevent the grease from entering the installation groove. Therefore, the surface acoustic wave sensor 100 provided by the utility model can effectively block the lubricating grease from contacting the sensing probe 21, avoid the damage of the sensor caused by the seepage of the grease, and further eliminate the safety hazards such as circuit sparking and high temperature of the equipment, to ensure the safe operation of the wind turbine blade 1000.
[0045] In addition to the above-mentioned fluororubber, polytetrafluoroethylene and other high molecular materials, the material of the oil-proof piece 1 can also be selected as the same as the material of the wind turbine blade 1000, that is, the oil-proof piece 1 is a glass steel base. Since the blade body 200 usually takes glass steel as the core material, the use of the same material for the oil-proof piece 1 can keep the acoustic impedance values of the two consistent, and the matching of the acoustic impedance values is crucial for the conduction of the surface acoustic wave signal. When the surface acoustic wave signal is transmitted from the blade to the oil-proof piece 1, the consistent acoustic impedance can greatly reduce the reflection and scattering loss of the signal at the interface of different media, avoid the attenuation or distortion of the signal due to the difference of the media, and ensure that the subsequent sensor body 2 can more accurately receive the surface acoustic wave signal related to the fault of the blade, further improving the sensitivity of fault detection. From the perspective of structural adaptability, the glass steel material also has good formability and can be processed into the same block or disc structure as the foregoing, and can stably form the oil-proof groove 111, and has certain oil resistance and mechanical strength, which can meet the oil-proof protection requirements and adapt to the mechanical environment in the operation process of the blade, and the compatibility with the blade material can also reduce the aging or adaptation problems that may be caused by the long-term contact of different materials.
[0046] Correspondingly, the material of the sealing connection layer 3 can be selected from polyurethane glue or epoxy resin with similar acoustic impedance value to the glass steel, in addition to epoxy oil-resistant adhesive and silicone high-temperature sealant. Considering that the oil-proof part 1 is made of glass steel, the sealing connection layer 3 as the connecting medium between the sensing probe 21 and the bottom wall of the oil-proof groove 111 has similar acoustic impedance value to the glass steel, which can further optimize the conduction path of the surface acoustic wave signal. When the signal is transmitted from the oil-proof part 1 (glass steel) to the sealing connection layer 3, the difference in acoustic impedance between the two is small, which can reduce the signal loss at the connection interface and ensure efficient signal transmission to the sensing probe 21. At the same time, both polyurethane glue and epoxy resin have excellent adhesive strength and oil resistance, and can form a stable film structure after curing, which not only meets the fixing requirements of the sensor body 2 and the oil-proof part 1, but also effectively seals the gap between the sensing probe 21 and the bottom wall of the oil-proof groove 111 to prevent oil from seeping in. The polyurethane glue also has a certain elasticity, which can play a buffering role when the paddle operates with slight vibration, reducing the impact of vibration on the connection stability of the sensing probe 21 and the oil-proof part 1. The epoxy resin has better high-temperature resistance and can adapt to the possible local temperature rise during the operation of the wind turbine, further ensuring the long-term reliability of the connection structure.
[0047] Please refer to Figure 1 and Figure 2 In an embodiment, the oil-proof part 1 includes a mounting seat 11, a first flange 12, and a first flow guide 13. The mounting seat 11 has an oil-proof groove 111 on one side. The side of the mounting seat 11 away from the oil-proof groove 111 is connected to the cavity wall of the mounting cavity 4. The edge of the mounting seat 11 is provided with the first flange 12 near the slot of the oil-proof groove 111. One end of the first flow guide 13 is arranged on the first flange 12, and the other end of the first flow guide 13 away from the mounting seat 11 is in sealing abutment with the inner wall of the mounting cavity 4.
[0048] It should be noted that the mounting seat 11 in the oil-proof piece 1, as the core bearing basis of the oil-proof piece 1, needs to have oil resistance and structural stability to adapt to the complex environment of the paddle mounting cavity 4. The material can be high-strength glass steel or modified phenolic resin composite material. Such materials not only have good compatibility with the paddle material, reducing stress deformation caused by long-term contact of different materials, but also provide sufficient structural strength for the opening of the oil-proof groove 111 while ensuring oil resistance, avoiding deformation of the oil-proof groove 111 caused by centrifugal force generated by high-speed rotation of the paddle. From the shape structure, the overall profile of the mounting seat 11 can be designed as an arc or a stepped shape that fits the inner wall of the paddle mounting cavity 4, ensuring a stable fit with the mounting cavity 4 after installation and reducing installation gaps; the oil-proof groove 111 is provided on the side of the mounting seat 11 facing the inside of the paddle, and the inner wall of the groove body can be designed as a slightly inclined smooth curved surface, which facilitates quick installation and positioning of the sensor body 2 and guides the small amount of oil that may be attached to slide along the curved surface, avoiding accumulation in the groove.
[0049] The first flange 12, as a key transition structure connecting the mounting seat 11 and the first flow guide 13, needs to have the same material as the mounting seat 11 or use a material with similar elastic modulus, such as the same type of glass steel or reinforced polypropylene, to ensure that no gaps are formed between the two due to differences in material shrinkage. From the shape structure, the first flange 12 is annular around the edge of the mounting seat 11, and its height needs to be slightly higher than the groove of the oil-proof groove 111, forming a "lip" structure. This design can initially block the oil flowing into the oil-proof groove 111 before the first flow guide 13 is installed; at the same time, a shallow groove needs to be provided on the side of the first flange 12 facing the first flow guide 13, and the shape of the shallow groove needs to be adapted to one end of the first flow guide 13. This can provide precise installation and positioning for the first flow guide 13, increase the contact area between the two, and improve the connection stability to prevent the first flow guide 13 from falling off during paddle vibration.
[0050] The first flow guide 13 needs to have oil resistance and aging resistance, and can be made of polyurethane elastic strip or glass steel flange. Long-term contact with lubricating oil will not cause swelling or aging failure. From the shape structure, the first flow guide 13 can be designed as an "L" type or "U" type section, with one end fixed to the first flange 12 and the other end designed as an arc, increasing the blocking area of the oil-proof piece 1 and effectively blocking oil from flowing into the oil-proof groove 111 from the space between the paddle body 200 and the first flange 12. In addition, the length of the first flow guide 13 needs to be consistent with the circumference of the first flange 12 to ensure complete ring sealing without dead angles.
[0051] In the embodiment, the mounting seat 11 is attached to the inner wall of the mounting cavity 4, reducing the initial installation gap, and the smooth curved surface design of the oil prevention groove 111 further reduces the risk of oil accumulation; the baffle structure of the first flange 12 not only enhances the initial blocking ability of oil, but also improves the connection stability with the first flow guide part 13. Thus, the sealing protection effect is further strengthened on the basis of the original oil prevention, ensuring that the sensing probe 21 is always in an environment free of oil erosion.
[0052] In addition to the above-mentioned fluororubber and polyurethane elastic material, the first flow guide part 13 can also be made of glass fiber reinforced plastic with the same material as the mounting seat 11. Since the mounting seat 11 is usually made of glass fiber reinforced plastic, selecting the same material for the first flow guide part 13 can achieve consistency of the overall material of the oil prevention part 1. On the one hand, it can avoid the gap problem at the connection part after long-term use due to the difference in thermal expansion coefficient and shrinkage rate between different materials, improving the stability and durability of the overall structure of the oil prevention part 1. On the other hand, glass fiber reinforced plastic has certain structural strength and oil resistance, which can meet the flow guide requirements of the first flow guide part 13 and avoid the loss of sealing effect due to material aging or swelling of the first flow guide part 13. From the shape structure, if the first flow guide part 13 is made of glass fiber reinforced plastic, it needs to be designed as a thin sheet or arc structure with certain elastic deformation ability. The thin sheet design can be attached to the slight curvature of the inner wall of the mounting cavity 4 through slight deformation, and the arc structure can increase the contact area with the inner wall of the mounting cavity 4, ensuring the sealing effect. At the same time, the connection mode of the first flow guide part 13 and the first flange 12 can be adjusted to integral molding or bolt fixation. Integral molding can completely eliminate the gap at the connection part of the two, and bolt fixation is convenient for subsequent maintenance and replacement. Both modes can ensure the positional stability of the first flow guide part 13 during the operation of the paddle, avoiding displacement of the first flow guide part 13 due to vibration.
[0053] Please refer to Figure 1 and Figure 2 In an embodiment, the first flow guide part 13 is inclined relative to the first flange 12, and the end of the first flow guide part 13 away from the mounting seat 11 is arranged to extend away from the groove bottom wall of the oil prevention groove 111.
[0054] It should be noted that the connection end of the first flow guide part 13 and the first flange 12 needs to be designed as a smooth transition arc connection structure, rather than a right angle connection. This arc connection can reduce the stress concentration at the connection part of the two, avoiding cracking of the connection end due to long-term inclined stress. Moreover, the extension direction of the first flow guide part 13 deviates from the groove bottom wall of the oil prevention groove 111, so that the first flow guide part 13 as a whole assumes an inclined posture opening outward.
[0055] In the embodiment, the inclined extension structure makes the first flow guide part 13 away from the bottom wall of the oil-proof groove 111, can actively guide the lubricating grease outside the circumferential side of the oil-proof part 1 to flow back during rotation to avoid entering the oil-proof groove 111; and the outwardly opened inclined posture can disperse the impact force of the paddle vibration on the first flow guide part 13, avoid fatigue damage of the first flow guide part 13 due to long-term vertical stress, prolong the service life of the first flow guide part 13, and at the same time, the structure also facilitates the disassembly and assembly of the sensor in the installation cavity 4, reduces the friction loss of the first flow guide part 13 and the inner wall of the installation cavity 4, and ensures the maintenance convenience of the whole sensor.
[0056] Referring to Figure 1 and Figure 2 In an embodiment, the oil-proof part 1 further comprises a second flow guide part 14, which is arranged on the first flange 12 and is inclined relative to the first flange 12, and the end of the second flow guide part 14 away from the first flange 12 is arranged to extend towards the bottom wall of the oil-proof groove 111; the second flow guide part 14 is used to guide the oil flowing into the oil-proof groove 111 to move away from the oil-proof groove 111.
[0057] It should be noted that if the first flange 12 is made of glass steel, the second flow guide part 14 can be made of a thin glass steel sheet of the same material, which is integrally formed or bonded to ensure the connection strength with the first flange 12 and avoid falling off due to paddle vibration; if the first flange 12 is made of oil-resistant high polymer material, the second flow guide part 14 can be made of fluororubber modified high polymer sheet with stronger flexibility, which can adapt to the slight space changes inside the installation cavity 4 while maintaining oil resistance. From the shape structure, the second flow guide part 14 is not simply inclined as a flat plate, and the side thereof facing the direction of oil flow can be designed as an arc-shaped convex surface. The arc-shaped structure can more smoothly change the trajectory of the oil flow, reducing the retention of the oil on the surface of the second flow guide part 14; at the same time, the end of the second flow guide part 14 away from the first flange 12 extends towards the bottom wall of the oil-proof groove 111, but the end needs to maintain a certain gap with the edge of the slot of the oil-proof groove 111, which neither blocks the protection space of the sensor body 2 by the oil-proof groove 111, nor accurately covers the main path of the oil flowing into the slot of the oil-proof groove 111.
[0058] In the embodiment, the second flow guide part 14 can reduce the flow resistance of the oil, so that the oil can slide away from the oil-proof groove 111 more quickly, reducing the risk of penetration caused by oil retention.
[0059] Referring to Figure 2 In an embodiment, the oil-proof part 1 further comprises a second flange 15, which is arranged on the bottom wall of the oil-proof groove 111; and the end of the second flange 15 away from the bottom wall of the oil-proof groove 111 is in abutting contact with the main body 22.
[0060] It should be noted that if the bottom wall of the oil-proof groove 111 is made of glass steel, the second flange 15 can be integrally formed of the same material to ensure the firmness of the connection with the bottom wall, and to avoid the flange from falling off due to blade vibration; if the bottom wall is made of oil-resistant high polymer material, the second flange 15 can be made of reinforced oil-resistant plastic with slightly higher hardness, which maintains oil resistance while providing stable support for the sensor body 2 to prevent the sensor body 2 from deforming under long-term pressure. From the shape structure, the second flange 15 can be designed as a ring or a plurality of evenly distributed block structures. The ring structure can provide uniform circumferential support for the sensor body 2, and the block structure can achieve local fixed-point support without affecting the filling of the sealing connection layer 3. At the same time, the end face of the second flange 15 away from the bottom wall needs to be polished flat to ensure that it can form a close-fitting planar contact with the sensor body 2 when in contact, avoiding uneven end faces that cause uneven stress on the sensor body 2.
[0061] In this embodiment, the second flange 15 can provide additional support for the sensor body 2, avoiding the stress sinking or deviation that may occur when the sensor body 2 is fixed only by the sealing connection layer 3, ensuring that the sensor body 2 always maintains a stable relative position with the bottom wall of the oil-proof groove 111, and thus ensuring the signal acquisition posture of the sensor probe 21.
[0062] In an embodiment, the sensor probe 21 is a glass steel probe.
[0063] It should be noted that the sensor probe 21 uses a glass steel probe, and the core design logic is to precisely match the acoustic impedance value with the glass steel material of the wind turbine blade 1000. Since the blade body 200 is made of glass steel, its acoustic impedance value has a specific parameter, and the acoustic impedance value of the glass steel probe can be adjusted by the material formula to match the blade, which fundamentally solves the core problem of the acoustic surface wave signal when transmitting between different media interfaces: when the signal is transmitted from the blade (glass steel) to the sensor probe (glass steel), there is no significant medium difference, which can greatly reduce the reflection and scattering loss of the signal at the interface. Compared with other material probes (such as metal, ordinary ceramic), the glass steel probe can avoid signal attenuation or distortion caused by acoustic impedance mismatch, allowing the sensor to more efficiently capture the subtle acoustic surface wave changes caused by lightning carbonization and cracking inside the blade.
[0064] Further, the cooperation of the glass steel probe and the glass steel oil-proof piece 1 and the glass steel second flange 15 can construct a "no-difference sound conduction path" from the blade to the sensor: the signal is first transmitted from the blade to the oil-proof piece 1 (glass steel), and then transmitted to the probe (glass steel) through the second flange 15 (glass steel), and there is no signal loss of the cross-medium interface in the whole process, which further guarantees the integrity and accuracy of signal acquisition. At the same time, the oil resistance and anti-aging of the glass steel probe are consistent with the material of the blade and the oil-proof piece 1, which can also avoid the electrochemical corrosion or physical wear caused by the long-term contact of different materials, thereby optimizing the signal transmission and prolonging the service life of the probe and other components.
[0065] Please refer to Figure 3 The utility model also provides a wind driven generator blade 1000, including paddle body 200, surface acoustic wave sensor 100 and connecting layer 300. Wherein, the inside of paddle body 200 is formed with installation cavity 4;Surface acoustic wave sensor 100 is contained in installation cavity 4;Connecting layer 300 is located between oil-proof piece 1 and the cavity wall of installation cavity 4, for fixing oil-proof piece 1 and paddle body 200. In addition, the specific embodiment of surface acoustic wave sensor 100 please refer to the technical scheme described above, since the wind driven generator blade 1000 adopts all technical schemes of surface acoustic wave sensor 100, at least has all beneficial effects brought by surface acoustic wave sensor 100, here is no longer tediously.
[0066] In an embodiment, the connecting layer 300 is a polyurethane adhesive layer or an epoxy adhesive layer.
[0067] It should be noted that the connecting layer 300 can generally use epoxy high-temperature-resistant and oil-resistant adhesive. Such adhesive can form a high-strength bonding structure after curing, ensuring that the oil-proof piece 1 and the cavity wall of the installation cavity 4 will not be displaced due to the centrifugal force generated by the high-speed rotation of the paddle body 200. At the same time, the adhesive layer formed after curing has good sealing performance, which can fill the small gap that may exist between the oil-proof piece 1 and the cavity wall of the installation cavity 4, thereby preventing lubricating oil from seeping into the main body 22. From the structural form, the connecting layer is a film-like structure uniformly filled between the oil-proof piece 1 and the cavity wall of the installation cavity 4. The thickness of the adhesive layer needs to be controlled to ensure sufficient bonding and fixation, and at the same time, it will not cause the distance between the oil-proof piece 1 and the cavity wall of the installation cavity 4 to be too large, thereby affecting the signal acquisition range. Through this structural design, the connecting layer 300 can stably fix the surface acoustic wave sensor 100 in the installation cavity 4, thereby ensuring the signal acquisition quality.
[0068] Correspondingly, the material of the connecting layer 300 can be polyurethane adhesive or epoxy resin layer in addition to epoxy oil-resistant adhesive and silicone high-temperature sealant, which has a similar acoustic impedance value to the glass fiber reinforced plastic, and the closeness of the acoustic impedance value to the glass fiber reinforced plastic can further optimize the conduction path of the surface acoustic wave signal. When the signal is transmitted from the blade body 200 (glass fiber reinforced plastic) to the connecting layer 300, the difference in acoustic impedance between the two is small, which can reduce the loss of the signal at the connecting interface and ensure efficient transmission of the signal to the sensing probe 21. At the same time, both polyurethane adhesive and epoxy resin have excellent adhesive strength and oil resistance, and can form a stable film structure after curing, which can not only meet the fixing requirements of the sensor and the blade body 200, but also effectively seal the gap between the sensing probe 21 and the bottom wall of the oil-proof groove 111, and block the infiltration of oil. The polyurethane adhesive also has a certain elasticity, which can play a buffering role when the blade body 200 generates slight vibration during operation, and reduce the influence of vibration on the connection stability of the sensor and the blade body 200. The epoxy resin has better high-temperature resistance, which can adapt to the possible local temperature rise during the operation of the wind turbine, and further ensure the long-term reliability of the connecting structure.
[0069] The utility model also provides a wind driven generator, including the wind driven generator blade 1000 as recorded in the above technical scheme. Since the wind driven generator adopts all the technical solutions of the wind driven generator, it at least has all the beneficial effects brought by the surface acoustic wave sensor 100, which will not be repeated here.
[0070] The above is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by the utility model specification and the attached drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.
Claims
1. A surface acoustic wave sensor provided in a mounting cavity of a wind turbine blade, characterized in that The surface acoustic wave sensor comprises: The oil-proof piece is provided with an oil-proof groove on one side thereof, and the side of the oil-proof piece away from the oil-proof groove is connected with the cavity wall of the mounting cavity; The sensor body comprises a main body and a sensing probe, the main body is accommodated in the oil-proof groove, the side of the main body facing the groove bottom wall of the oil-proof groove is provided with a mounting groove, and the sensing probe is arranged on the main body and accommodated in the mounting groove; and The sealing connection layer is arranged between the sensing probe and the groove bottom wall of the oil-proof groove, and is used for fixing the oil-proof piece and the sensing probe and sealing the mounting groove.
2. The surface acoustic wave sensor of claim 1, wherein, The oil-proof piece comprises a mounting seat, a first flange and a first flow guide part, the mounting seat is provided with the oil-proof groove on one side thereof, the side of the mounting seat away from the oil-proof groove is connected with the cavity wall of the mounting cavity, the edge of the mounting seat is provided with the first flange close to the groove opening of the oil-proof groove, and one end of the first flow guide part is arranged on the first flange, and the end of the first flow guide part away from the mounting seat is sealingly abutted with the inner wall of the mounting cavity.
3. The surface acoustic wave sensor of claim 2, wherein, The first flow guide part is arranged obliquely relative to the first flange, and the end of the first flow guide part away from the mounting seat extends in a direction away from the groove bottom wall of the oil-proof groove.
4. The surface acoustic wave sensor of claim 2, wherein, The oil-proof piece further comprises a second flow guide part, the second flow guide part is arranged on the first flange and arranged obliquely relative to the first flange, the end of the second flow guide part away from the first flange extends in a direction close to the groove bottom wall of the oil-proof groove, and the second flow guide part is used for guiding the oil flowing to the groove opening of the oil-proof groove to move in a direction away from the oil-proof groove.
5. The surface acoustic wave sensor of claim 2, wherein, The oil-proof piece further comprises a second flange, the second flange is arranged on the groove bottom wall of the oil-proof groove, and the end of the second flange away from the groove bottom wall of the oil-proof groove is in abutting contact with the main body.
6. The surface acoustic wave sensor according to any one of claims 1 to 5, wherein The sealing connection layer is a polyurethane adhesive layer or an epoxy resin adhesive layer.
7. The surface acoustic wave sensor according to any one of claims 1 to 5, wherein The oil-proof piece is a glass steel base; and / or The sensing probe is a glass steel probe.
8. A wind turbine blade, characterised in that Comprise: The paddle body is provided with a mounting cavity in the inside thereof; and The surface acoustic wave sensor according to any one of claims 1 to 7 is accommodated in the mounting cavity; and The connection layer is arranged between the oil-proof piece and the cavity wall of the mounting cavity, and is used for fixing the oil-proof piece and the paddle body.
9. A wind turbine blade according to claim 8, wherein The connection layer is a polyurethane adhesive layer or an epoxy resin adhesive layer.
10. A wind power generator, characterized by The wind turbine blade comprises the wind turbine blade according to claim 8 or 9.