Surface acoustic wave sensing device and wind generating set

Abstract

The utility model discloses a surface acoustic wave sensing device and a wind generating set, and relates to the technical field of wind power equipment monitoring, the surface acoustic wave sensing device is applied to the wind generating set, the wind generating set is provided with a main bearing and a bearing installation seat, and the main bearing is installed in the bearing installation seat. The surface acoustic wave sensing device comprises a mounting structure and a plurality of sensors, and the mounting structure is used for being mounted on the first side surface of the bearing mounting seat along the axis; the plurality of sensors are arranged on the mounting structure at intervals, each sensor is provided with a probe, and the plurality of probes are used for abutting against the first side surface so as to monitor the surface acoustic wave of the main bearing. According to the utility model, the plurality of sensors are arranged on the mounting structure, and the probes of the plurality of sensors are propped against the surface of the bearing mounting seat, so that multi-point monitoring on the surface acoustic waves of the main bearing is formed, the detection capability on early weak defect signals of the main bearing is improved, and a reliable abnormal signal positioning effect can be realized.

Description

Technical Field

[0001] This utility model relates to the field of wind power equipment monitoring technology, and in particular to a surface acoustic wave sensing device and a wind turbine generator set. Background Technology

[0002] As wind turbine generators become larger, the main bearings, as the core components connecting the transmission chain, bear increasingly complex and demanding loads. Early failures of the main bearings (such as raceway spalling and cage damage) will trigger specific acoustic characteristic signals. By capturing and analyzing these signals, early warning of failures can be achieved.

[0003] Currently, the condition monitoring of the main bearings of wind turbine generators mainly relies on acoustic monitoring methods. Since the main bearing is usually installed in a bearing mounting housing, it is difficult to measure the main bearing directly. Therefore, the mainstream monitoring method usually involves placing a single-point audio acquisition device, such as an audio or surface acoustic wave sensor, on the surface of the bearing mounting housing to collect the acoustic emission signals during the operation of the main bearing, and then combining this with spectrum analysis to determine whether there is a fault in the bearing.

[0004] However, the damage signals emitted when the internal raceways and rollers of the main bearing are slightly damaged are relatively weak. In addition, the main bearing often contains a lot of lubricating grease, which absorbs and consumes the damage audio signals. Therefore, mainstream acoustic monitoring solutions are unable to detect early defect signals with weak intensity.

[0005] Therefore, there is an urgent need for a new type of surface acoustic wave sensing device to solve the problem that mainstream acoustic monitoring schemes are unable to detect early defect signals with weak intensity. Utility Model Content

[0006] The main purpose of this invention is to propose a surface acoustic wave sensing device and a wind turbine generator set, which aims to solve the problem that current acoustic monitoring schemes are unable to detect early defect signals with weak intensity.

[0007] To achieve the above objectives, the surface acoustic wave (SAW) sensing device proposed in this utility model is applied to a wind turbine generator set. The wind turbine generator set has a main bearing and a bearing mounting base. The main bearing is installed in the bearing mounting base. The SAW sensing device includes a mounting structure and multiple sensors. The mounting structure is used to install on a first side of the bearing mounting base along the axis. Multiple sensors are spaced apart on the mounting structure. Each sensor has a probe. Multiple probes are used to abut against the first side to monitor the SAW of the main bearing.

[0008] In one embodiment, a coupling layer is provided on the side of the probe facing the first side, the probe is connected to the coupling layer, the acoustic impedance of the coupling layer is matched with the acoustic impedance of the first side, and the coupling layer is used to abut against the first side.

[0009] In one embodiment, the wind turbine generator set also has a main shaft that mates with a main bearing; the mounting structure is ring-shaped and includes at least two arc-shaped structures that are detachably connected to each other to form a ring; the inner circumference of the mounting structure is for the main shaft to pass through; a first side of the mounting structure along the axial direction is for mounting on a first side surface; and multiple sensors are respectively disposed on the at least two arc-shaped structures.

[0010] In one embodiment, the mounting structure further includes a conduit structure, through which at least two arc segment structures are detachably connected.

[0011] In one embodiment, the arc segment structure has a receiving cavity inside, and the sensor is disposed in the receiving cavity. The arc segment structure has multiple monitoring holes on the first side along the axial direction. The multiple monitoring holes are spaced apart along the circumferential direction of the arc segment structure. Multiple probes are inserted through the multiple monitoring holes one by one, and the coupling layer on each probe extends out of the corresponding monitoring hole and abuts against the first side.

[0012] In one embodiment, the number of sensors distributed on each arc segment structure is the same; and / or, the sensors are arranged at equal intervals on the arc segment structure.

[0013] In one embodiment, an adsorption structure is provided on the side of the arc-shaped structure facing the first side, and the adsorption structure is used to adsorb onto the first side.

[0014] In one embodiment, the adsorption structure further includes a plurality of adhesive sites coated with adhesive, the plurality of adhesive sites being spaced apart on one side of the arc segment structure facing the first side.

[0015] In one embodiment, the first side of the bearing mounting base is made of ferromagnetic material, and the adsorption structure includes multiple magnetic positions, each of which is provided with a magnetic element. The multiple magnetic positions are spaced apart on the side of the arc structure facing the first side.

[0016] This utility model also proposes a wind turbine generator set, including a main bearing, a bearing mounting base, and the aforementioned surface acoustic wave sensing device.

[0017] The technical solution of this utility model, by employing an installation structure mounted on the first side of the bearing mounting base, provides a stable and close-to-the-monitor mounting foundation for the sensor array. This ensures that the sensor can be positioned at a suitable monitoring location near the main bearing, facilitating the effective acquisition of surface acoustic waves (SAW) from the main bearing. Furthermore, by having the sensor probe abut against the first side, it ensures that SAW can be efficiently transmitted to the sensor probe through solid contact, effectively reducing signal attenuation and distortion caused by air gaps or loose mounting, and guaranteeing the fidelity of the original signal acquisition. Furthermore, since multiple sensors are spaced apart on the mounting structure, the probes of multiple sensors can form multi-point monitoring of the main bearing. This allows multiple sensors to collect surface acoustic wave signals from different spatial orientations during the operation of the main bearing, thereby realizing multi-point collaborative monitoring of the overall operating status of the main bearing. This design can capture early fault acoustic signals from the main bearing from different spatial locations, which can increase the signal acquisition coverage and signal information dimension of the main bearing. It facilitates signal enhancement and mutual verification through multi-channel data joint analysis, improves the detection capability of early damage to the main bearing, and effectively reduces the missed or false alarm rate caused by weak signals or single sensor failure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an embodiment of the surface acoustic wave sensing device provided by this utility model.

[0020] Figure 2 A schematic diagram of a wind turbine generator set according to an embodiment of the present invention.

[0021] Figure 3 A schematic diagram of the sensor structure of an embodiment of the surface acoustic wave sensing device provided by this utility model.

[0022] Explanation of icon numbers:

[0023] 1. Surface acoustic wave sensing device; 11. Mounting structure; 111. Arc segment structure; 112. Conduit structure; 113. Adsorption structure; 1131. Adhesive position; 1132. Magnetic position; 12. Sensor; 121. Probe; 122. Coupling layer;

[0024] 2. Wind turbine generator set; 21. Main bearing; 22. Bearing mounting base.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] As wind turbine generators become larger, the main bearings, as the core components connecting the transmission chain, bear increasingly complex and demanding loads. Early failures of the main bearings (such as raceway spalling and cage damage) will trigger specific acoustic characteristic signals. By capturing and analyzing these signals, early warning of failures can be achieved.

[0030] Currently, the condition monitoring of the main bearings of wind turbine generators mainly relies on acoustic monitoring methods. Since the main bearing is usually installed in a bearing mounting housing, it is difficult to measure the main bearing directly. Therefore, the mainstream monitoring method usually involves placing a single-point audio acquisition device, such as an audio or surface acoustic wave sensor, on the surface of the bearing mounting housing to collect the acoustic emission signals during the operation of the main bearing, and then combining this with spectrum analysis to determine whether there is a fault in the bearing.

[0031] However, the damage signals emitted when the internal raceways and rollers of the main bearing are slightly damaged are relatively weak. In addition, the main bearing often contains a lot of lubricating grease, which absorbs and consumes the damage audio signals. Therefore, mainstream acoustic monitoring solutions are unable to detect early defect signals with weak intensity.

[0032] Therefore, there is an urgent need for a new type of surface acoustic wave sensing device to solve the problem that mainstream acoustic monitoring schemes are unable to detect early defect signals with weak intensity.

[0033] To address the aforementioned problems, this utility model proposes a surface acoustic wave sensing device.

[0034] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the surface acoustic wave (SAW) sensing device 1 is applied to a wind turbine generator set 2. The wind turbine generator set 2 has a main bearing 21 and a bearing mounting base 22. The main bearing 21 is installed in the bearing mounting base 22. The SAW sensing device 1 includes a mounting structure 11 and a plurality of sensors 12. The mounting structure 11 is used to install on a first side of the bearing mounting base 22 along the axis. The plurality of sensors 12 are spaced apart on the mounting structure 11. The sensors 12 have probes 121. The plurality of probes 121 are used to abut against the first side to monitor the SAW of the main bearing 21.

[0035] The technical solution of this utility model, by employing an installation structure 11 mounted on the first side of the bearing mounting base 22, provides a stable and close-to-the-monitor mounting foundation for the sensor 12 array, ensuring that the sensor 12 can be positioned at a suitable monitoring location near the main bearing 21, which helps to effectively collect the surface acoustic waves of the main bearing 21. Furthermore, by having the probe 121 of the sensor 12 abut against the first side, it is ensured that the surface acoustic waves can be efficiently transmitted to the probe 121 of the sensor 12 through solid contact, effectively reducing signal attenuation and distortion caused by air gaps or loose installation, and ensuring the fidelity of the original signal acquisition. Furthermore, since multiple sensors 12 are spaced apart on the mounting structure 11, the probes 121 of the multiple sensors 12 can form multi-point monitoring of the main bearing 21, enabling multiple sensors 12 to collect surface acoustic wave signals of the main bearing 21 during operation from different spatial orientations, thereby realizing multi-point collaborative monitoring of the overall operating status of the main bearing 21. This design can capture early fault acoustic signals from the main bearing 21 from different spatial locations, which can increase the signal acquisition coverage and signal information dimension of the main bearing 21, facilitate signal enhancement and mutual verification through multi-channel data joint analysis, improve the detection capability of early damage to the main bearing 21, and effectively reduce the false alarm or missed alarm rate caused by weak signals or failure of a single sensor 12.

[0036] Furthermore, since the main bearing 21 of the wind turbine generator set 2 is large in size and long in diameter, single-point acoustic monitoring is difficult to locate abnormal signals of the main bearing 21. However, the technical solution of this utility model uses probes 121 of multiple sensors 12 to monitor the surface acoustic waves of the main bearing 21 from different spatial orientations. Moreover, the positions of the multiple sensors 12 on the mounting structure 11 can be known in advance. Therefore, it is convenient to use time difference positioning, phase analysis and other algorithms in combination with the position of the sensors 12 on the mounting structure 11 to accurately determine the specific circumferential or axial position of the abnormal sound source inside the main bearing 21, so as to achieve a reliable abnormal signal location effect.

[0037] Overall, the technical solution of this utility model forms a multi-point monitoring of the surface acoustic waves of the main bearing 21 by setting multiple sensors 12 in the mounting structure 11 and having the probes 121 of the multiple sensors 12 abut against the surface of the bearing mounting seat 22, thereby improving the detection capability of early weak defect signals of the main bearing 21 and achieving a reliable abnormal signal positioning effect.

[0038] It can be understood that the wind turbine generator set 2 may have components such as a generator, main shaft, main bearing 21, bearing mounting seat 22, hub, and blades. The main bearing 21 is installed in the bearing mounting seat 22, the main shaft passes through the main bearing 21, one end of the main shaft is connected to the hub, the outer circumference of the hub is connected to the blades, and the other end of the main shaft is connected to the generator drive. Under the action of wind, the blades drive the hub and main shaft to rotate, thereby generating electricity.

[0039] As an optional implementation, the mounting structure 11 can be annular, so that multiple sensors 12 are spaced apart along the circumference of the annular mounting structure 11, and the annular mounting structure 11 is mounted on the first side of the bearing mounting seat 22, thereby monitoring the circumferential location of the main bearing 21. Furthermore, the circumferential arrangement of the mounting structure 11 also allows the main shaft to pass through the inner ring of the mounting structure 11, avoiding interference of the mounting structure 11 with the rotation of the main shaft.

[0040] Furthermore, since the main bearing 21 is installed inside the bearing mounting housing 22, it is difficult to measure the main bearing 21 directly. The surface acoustic wave (SAW) of the main bearing 21 needs to be measured through the bearing mounting housing 22. When an abnormality occurs inside the main bearing 21, such as raceway damage, roller breakage, or grease contamination, the abnormal SAW signal often attenuates significantly by the time it reaches the probe 121 of the sensor 12 after propagating along the solid. Therefore, this places high demands on the sensitivity of the sensor 12; insufficient sensitivity will prevent the effective identification of abnormal acoustic signatures at the distal end of the main bearing 21.

[0041] Please see Figures 1 to 3 To improve the sensitivity of sensor 12 and avoid the problem that sensor 12 cannot effectively identify abnormal acoustic patterns at the far end of main bearing 21 due to insufficient sensitivity, in this embodiment of the utility model, a coupling layer 122 is provided on the side of probe 121 facing the first side. Probe 121 is connected to coupling layer 122. The acoustic impedance of coupling layer 122 is matched with the acoustic impedance of the first side. Coupling layer 122 is used to abut against the first side.

[0042] In this embodiment, by providing a coupling layer 122 on the side of the probe 121 facing the first side, and matching the acoustic impedance of the coupling layer 122 with the acoustic impedance of the first side, the coupling layer 122 fills the microscopic gap between the probe 121 and the first side, thereby achieving efficient transmission of acoustic wave energy. Specifically, since surface acoustic wave signals are reflected and scattered when passing through different medium interfaces, the formula for calculating the reflection coefficient R is R=[(Z2-Z1) / (Z2+Z1)], where Z1 and Z2 represent the acoustic impedances of the two media, respectively. The closer the acoustic impedances (Z1, Z2) of the two media are, the smaller the reflection coefficient R value, meaning that more energy can penetrate the interface. Therefore, by providing a coupling layer 122 on the probe 121 and matching the acoustic impedance of the coupling layer 122 with the acoustic impedance of the first side, the reflection and scattering loss of the sound wave at the interface between the probe 121 and the first side is reduced, allowing more acoustic signal energy to be transmitted to the sensor 12, directly improving the sensitivity and fidelity of signal acquisition. In addition, the coupling layer 122 abuts against the first side surface. By controlling the surface roughness of the coupling layer 122, the coupling layer 122 and the first side surface of the bearing mounting seat 22 can form good contact when abutting, avoiding the loss of surface acoustic wave signal caused by air gap, and further ensuring the reliability of monitoring.

[0043] As an optional implementation, the coupling layer 122 can be made of a specially formulated resin material. The density of the composite material can be adjusted by adding high-density fillers such as tungsten powder and barium sulfate, so that the acoustic impedance value of the coupling layer 122 is between that of the probe 121 and the steel material of the bearing mounting seat 22, thereby achieving a better acoustic impedance matching effect.

[0044] Please see Figure 1 and Figure 2 In an embodiment of this utility model, the wind turbine generator set 2 also has a main shaft (not shown in the figure), which is engaged with the main bearing 21; the mounting structure 11 is ring-shaped and includes at least two arc segment structures 111, which are detachably connected to each other and form a ring; the inner circumference of the mounting structure 11 is used for the main shaft to pass through; the first side of the mounting structure 11 along the axial direction is used for mounting on the first side; and multiple sensors 12 are respectively disposed on at least two arc segment structures 111.

[0045] In this embodiment, by setting the mounting structure 11 as a ring and including at least two arc-shaped structures 111 that are detachably connected to each other, both the surrounding multi-point monitoring of the main bearing 21 is achieved, and the assembly problem of not being able to fit a complete ring structure when the main shaft is already installed is solved. Specifically, since the main shaft of the wind turbine generator set 2 is already installed with the main bearing 21, and the main shaft of the wind turbine generator set 2 is relatively long, it is difficult to fit a complete ring structure from the end of the main shaft onto the bearing mounting seat 22; however, by adopting a scheme in which at least two arc-shaped structures 111 are detachably connected to each other to form a ring, the mounting structure 11 can be assembled separately from the side of the main shaft. First, each arc-shaped structure 111 is arranged around the main shaft, and then each arc-shaped structure 111 is spliced ​​into a complete ring through a detachable connection, so that the mounting structure 11 can be conveniently installed on the first side of the bearing mounting seat 22. At the same time, the inner circumference of the mounting structure 11 allows the main shaft to pass through, avoiding interference with the normal rotation of the main shaft. Furthermore, by setting multiple sensors 12 on at least two arc-shaped structures 111, the sensors 12 can be distributed circumferentially along the annular mounting structure 11, enabling all-round monitoring of the main bearing 21. This ensures that the optimal detection range of the sensing probe 121 can cover the entire circumferential area of ​​the main bearing 21, thereby improving the comprehensiveness and reliability of the monitoring.

[0046] As an optional implementation, the arc structure 111 can be a semi-circular arc segment (or a structure approximately a semi-circular arc segment) or a one-third circular arc segment. Two semi-circular arc segments (or structures approximately a semi-circular arc segment) can be connected by bolts, snap-fit ​​connections, or splicing to form a complete ring-shaped installation structure 11; or three one-third circular arc segments can be spliced ​​at the ends to form a ring, in order to meet the monitoring requirements of main bearings 21 with different diameter specifications. The connection method of the arc structure 111 is not limited here.

[0047] Please see Figure 1 In an embodiment of this utility model, the mounting structure 11 further includes a conduit structure 112, and at least two arc segment structures 111 are detachably connected through the conduit structure 112.

[0048] In this embodiment, a conduit structure 112 is used to achieve a detachable connection between at least two arc-shaped structures 111, thereby ensuring the overall ring-shaped rigidity of the mounting structure 11 while providing a regular routing channel for the signal cables of the sensor 12. Specifically, the conduit structure 112 not only acts as a mechanical connector to splice the arc-shaped structures 111 into a stable ring-shaped whole, ensuring the installation stability of the mounting structure 11 on the bearing mounting seat 22, but its hollow internal cavity can also be used to run the signal transmission cables of the sensor 12, allowing the cables to be arranged in an orderly manner along the circumference of the mounting structure 11, avoiding potential mechanical damage, lubricant contamination, or electromagnetic interference to the exposed cables; in addition, since the conduit structure 112 and the arc-shaped structures 111 are detachably connected, the arc-shaped structures 111 and the sensor 12 can be positioned first during installation, and then connected and fixed through the conduit structure 112, simplifying the on-site assembly process. It also facilitates partial disassembly when maintaining or replacing individual arc-shaped structures 111 or the sensor 12 later, without having to remove the entire mounting structure 11.

[0049] It is understood that the two ends of the conduit structure 112 may be provided with flanges or threaded joints, and the end of the arc segment structure 111 is provided with a corresponding connection interface, which can be detached by bolt fastening or thread engagement; the material of the conduit structure 112 may be engineering plastic to take into account both mechanical strength and electromagnetic interference resistance.

[0050] Please see Figure 1 and Figure 3 In an embodiment of this utility model, the arc segment structure 111 has a receiving cavity (not shown in the figure) inside, and the sensor 12 is disposed in the receiving cavity. The arc segment structure 111 has multiple monitoring holes on the first side along the axial direction. The multiple monitoring holes are arranged at intervals along the circumference of the arc segment structure 111. Multiple probes 121 are inserted through the multiple monitoring holes one by one, and the coupling layer 122 on each probe 121 extends out of the corresponding monitoring hole and abuts against the first side.

[0051] In this embodiment, by providing a receiving cavity inside the arc segment structure 111 and placing the sensor 12 inside the receiving cavity, a physical protective space is provided for the sensor 12, effectively isolating it from high-intensity vibrations, electromagnetic interference, and lubricating grease contamination around the main bearing 21 seat, thereby improving the working reliability and service life of the sensor 12 under harsh working conditions. Simultaneously, by opening multiple monitoring holes spaced circumferentially on the first side of the arc segment structure 111 along the axial direction, and having the probe 121 correspondingly inserted into each monitoring hole, it is ensured that the probe 121 can be directly aligned with the first side of the bearing mounting seat 22. The probe 121 is brought into contact with the ground to achieve effective acquisition of surface acoustic waves. The radial limiting effect of the monitoring hole on the probe 121 ensures that the probe 121 maintains a stable contact posture during long-term use, avoiding displacement or loosening of the probe 121 due to vibration. In addition, by allowing the coupling layer 122 on each probe 121 to extend out of the corresponding monitoring hole and abut against the first side, it is ensured that the coupling layer 122 can directly fill the gap between the probe 121 and the first side, achieving acoustic impedance matching and tight contact, minimizing the transmission loss of sound waves at the interface, and ensuring the sensitivity and fidelity of signal acquisition.

[0052] As an optional implementation, the opening of the receiving cavity may be provided with a removable sealing cover to facilitate the installation and maintenance of the sensor 12, while preventing contaminants from entering the receiving cavity.

[0053] Please see Figure 1 and Figure 2 To improve the convenience of monitoring data processing and the accuracy of positioning algorithms, in the embodiments of this utility model, the number of sensors 12 distributed on each arc segment structure 111 is the same; and / or, the sensors 12 are arranged at equal intervals on the arc segment structure 111.

[0054] In this embodiment, by ensuring that the number of sensors 12 distributed on each arc segment structure 111 is consistent, the entire sensor 12 array exhibits a uniform circumferential distribution after multiple arc segment structures 111 are spliced ​​into a ring-shaped mounting structure 11. This facilitates the use of unified algorithm parameters during subsequent signal processing, simplifying the complexity of multi-channel signal joint analysis. Simultaneously, the uniformly distributed sensor 12 array helps improve the computational stability and positioning accuracy of algorithms such as time difference positioning and phase analysis, avoiding positioning errors or algorithm distortions caused by uneven sensor 12 distribution. Furthermore, by equidistantly spacing the sensors 12 on the arc segment structure 111, the arc length distance between adjacent sensors 12 remains constant. Therefore, when performing abnormal sound source localization calculations, a uniformly spaced array model can be directly used for time difference estimation, reducing additional geometric correction calculations due to unequal spacing and improving the real-time performance and accuracy of the positioning algorithm. At the same time, the equidistant arrangement also ensures that the monitoring sensitivity of each sensor 12 to different orientations of the main bearing 21 is consistent, avoiding local monitoring blind spots or uneven sensitivity caused by differences in sensor 12 spacing.

[0055] As an optional implementation, for the ring-shaped mounting structure 11 formed by splicing two semicircular arc segments, 3 to 5 sensors 12 can be equidistantly arranged on each semicircular arc segment, so that the entire ring array has 6 to 10 uniformly distributed monitoring points, taking into account both monitoring resolution and cost control requirements.

[0056] Due to the need to protect the main bearing 21, the bearing mounting base 22 provides tight protection for the main bearing 21, and for strength considerations, the sensor 12 cannot be installed by drilling. Please refer to... Figure 1 and Figure 2 To solve the technical problem of not being able to drill holes on the surface of the main bearing 21 seat to install the sensor 12, in an embodiment of this utility model, an adsorption structure 113 is provided on the side of the arc segment structure 111 facing the first side, and the adsorption structure 113 is used to adsorb onto the first side.

[0057] In this embodiment, by setting an adsorption structure 113 on the side of the arc-shaped structure 111 facing the first side, the arc-shaped structure 111 is directly fixed to the first side of the bearing mounting seat 22 using the adsorption structure 113. This eliminates the need for drilling or bolting on the bearing mounting seat 22, avoiding the risk of damaging the structural strength of the main bearing 21 seat and meeting the requirement that the surface of the wind turbine main bearing 21 seat should not have any hole-like damage. At the same time, the adsorption structure 113 enables rapid installation and disassembly between the arc-shaped structure 111 and the first side, facilitating the placement of the sensor 12 and subsequent maintenance and replacement by on-site construction personnel, thus improving the efficiency and convenience of on-site operations. In addition, the adsorption structure 113 maintains a tight fit between the arc-shaped structure 111 and the first side in the adsorption state, providing a mechanical basis for the stable contact between the sensor 12 probe 121 and the first side. This ensures that the arc-shaped structure 111 will not loosen or shift under the vibration environment during the long-term operation of the wind turbine generator 2, guaranteeing the long-term stability and reliability of the monitoring system.

[0058] As an optional implementation, the adsorption structure 113 can be at least one of magnetic adsorption, vacuum adsorption or adhesive adsorption, or a combination of multiple adsorption methods, to meet the fixing requirements of bearing mounting seats 22 with different materials and surface conditions.

[0059] Please see Figure 1 In an embodiment of the present invention, the adsorption structure 113 further includes a plurality of adhesive sites 1131, the adhesive sites 1131 being coated with adhesive, and the plurality of adhesive sites 1131 being spaced apart on one side of the arc segment structure 111 facing the first side.

[0060] In this embodiment, by providing multiple adhesive positions 1131 in the adsorption structure 113 and applying adhesive to the adhesive positions 1131, a firm connection between the arc segment structure 111 and the first side surface is achieved by utilizing the adhesive force after the adhesive has cured. Compared to simple mechanical clamping or magnetic fixation, adhesive connection can provide uniform fixing force to the adhesive part. In addition, after the adhesive has cured, it can also fill the microscopic unevenness between the arc segment structure 111 and the first side surface.

[0061] As an optional implementation method, the adhesive can be an epoxy resin structural adhesive or an acrylic ester instant adhesive, selected according to the on-site construction conditions and curing time requirements; the spacing between each adhesive position 1131 is reasonably arranged according to the length and rigidity of the arc structure 111.

[0062] Please see Figure 1 and Figure 2In an embodiment of this utility model, the first side of the bearing mounting base 22 is made of ferromagnetic material, and the adsorption structure 113 includes a plurality of magnetic adsorption positions 1132. Magnetic elements are provided on the magnetic adsorption positions 1132, and the plurality of magnetic adsorption positions 1132 are spaced apart on the side of the arc segment structure 111 facing the first side.

[0063] In this embodiment, since the first side of the bearing mounting base 22 is made of ferromagnetic material, multiple magnetic suction positions 1132 are set in the adsorption structure 113, and magnetic components are set on the magnetic suction positions 1132. The magnetic attraction between the magnetic components and the ferromagnetic first side is used to quickly adsorb and fix the arc segment structure 111, realizing the sensor 12 can be used immediately after installation, shortening the on-site installation and debugging time. At the same time, the magnetic connection method is reversible, which facilitates the disassembly and maintenance of the arc segment structure 111 or the sensor 12 in the later stage without damaging the surface of the bearing mounting base 22, thus meeting the maintenance-free and damage-free working condition requirements of the main bearing 21 seat. Furthermore, since multiple magnetic attraction positions 1132 are spaced apart on the side of the arc structure 111 facing the first side, the magnetic attraction force is evenly distributed along the contact surface. Combined with the spacing design between the multiple magnetic attraction positions 1132, it can effectively resist the displacement tendency of the arc structure 111 in the tangential and normal directions, ensuring a stable contact between the arc structure 111 and the first side. At the same time, the attraction force provided by the magnetic attraction positions 1132 can also help the probe 121 maintain a stable contact pressure with the first side, ensuring the efficient transmission of surface acoustic wave signals.

[0064] Furthermore, by combining magnetic attraction and adhesive adhesion, the adsorption effect between the arc structure 111 and the first side is made more reliable, so as to resist the complex vibration and impact load generated during the operation of the wind turbine generator 2 and prevent the arc structure 111 from loosening or falling off during long-term use.

[0065] In one optional implementation, the magnetic component can be a neodymium iron boron permanent magnet or a ferrite magnet, selected according to the required adsorption force; the magnetic attraction position 1132 can be configured as a countersunk hole structure or a boss structure for embedding or fixing the magnetic component, and the adsorption surface of the magnetic component is flush with or slightly protruding from the side of the arc segment structure 111 facing the first side to ensure effective contact with the first side; multiple magnetic attraction positions 1132 can be arranged at intervals along the circumference and axial direction of the arc segment structure 111 to form a multi-point magnetic attraction array, thereby improving the overall adsorption stability.

[0066] In addition, the magnetic attraction position 1132 and the adhesive position 1131 can be stacked together, such as the adhesive position 1131 being stacked on the outside of the magnetic attraction position 1132; the magnetic attraction position 1132 and the adhesive position 1131 can also be spaced apart, which is not limited here.

[0067] Please see Figure 2This utility model also proposes a wind turbine generator set 2, which includes a main bearing 21, a bearing mounting base 22, and the aforementioned surface acoustic wave (SAW) sensing device 1. The specific structure of the SAW sensing device 1 is as described in the above embodiments. Since this wind turbine generator set 2 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The main bearing 21 is installed inside the bearing mounting base 22, and the SAW sensing device 1 is correspondingly installed on the first axial side of the bearing mounting base 22.

[0068] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A surface acoustic wave sensing device, characterized by, The application is applied to a wind turbine, the wind turbine has a main bearing and a bearing mounting seat, the main bearing is installed in the bearing mounting seat, the surface acoustic wave sensing device comprises: a mounting structure for mounting on a first side of the bearing mounting seat along an axis; a plurality of sensors are arranged on the mounting structure, the sensors have probes for abutting against the first side to monitor the surface acoustic wave of the main bearing.

2. The SAW sensor device of claim 1, wherein, The probe is provided with a coupling layer on the side facing the first side, the probe is connected with the coupling layer, the acoustic impedance of the coupling layer matches the acoustic impedance of the first side, and the coupling layer is used for abutting against the first side.

3. The SAW sensor device of claim 2, wherein, The wind turbine also has a main shaft matched with the main bearing; The mounting structure is annular, the mounting structure comprises at least two arc segment structures, the at least two arc segment structures are detachably connected with each other and form a ring, an inner periphery of the mounting structure is used for passing through the main shaft, a first side of the mounting structure along the axis is used for mounting on the first side, and the plurality of sensors are arranged on the at least two arc segment structures respectively.

4. The SAW sensor device of claim 3, wherein, The mounting structure further comprises a wire tube structure, and the at least two arc segment structures are detachably connected through the wire tube structure.

5. The SAW sensor device of claim 4, wherein, The arc segment structure is internally provided with a receiving cavity, the sensor is arranged in the receiving cavity, a first side of the arc segment structure along the axis is provided with a plurality of monitoring holes, the plurality of monitoring holes are arranged at intervals along the circumference of the arc segment structure, the plurality of probes are correspondingly arranged in the plurality of monitoring holes, and the coupling layer on each probe extends out of the corresponding monitoring hole and abuts against the first side.

6. The SAW sensor device of claim 3, wherein, The number of sensors distributed on each arc segment structure is consistent; and / or, the sensors are equally and interval arranged on the arc segment structure.

7. The SAW sensor device of claim 3, wherein, The arc segment structure is provided with an adsorption structure on the side facing the first side, and the adsorption structure is used for adsorbing on the first side.

8. The SAW sensor device of claim 7, wherein, The adsorption structure further comprises a plurality of adhesive positions, the adhesive positions are coated with adhesive, and the adhesive positions are arranged at intervals on the side of the arc segment structure facing the first side.

9. The surface acoustic wave sensor device of claim 7 or 8, wherein, The first side of the bearing mounting seat is made of ferromagnetic material, the adsorption structure comprises a plurality of magnetic positions, the magnetic positions are provided with magnetic members, and the magnetic positions are arranged at intervals on the side of the arc segment structure facing the first side.

10. A wind power unit, characterized in that The application further discloses a wind turbine comprising a main bearing, a bearing mounting seat and the surface acoustic wave sensing device.

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