Wind wheel with vibration monitoring function for wind driven generator

Abstract

The utility model provides a wind wheel with a vibration monitoring function for a wind driven generator, and relates to the field of wind power generation. The wind wheel comprises a hub used for being connected with a main shaft of the wind driven generator, a plurality of blades which are detachably arranged on the hub and provided with mounting slots in the side faces, a plurality of vibration monitoring assemblies matched with the blades in a one-to-one mode, and an electric slip ring, wherein the vibration monitoring assemblies are matched with the blades in a one-to-one mode. The vibration monitoring assembly comprises a mounting rack in plugging cooperation with the mounting slot, a positioning block used for positioning the mounting rack and detachably arranged at a slot opening of the mounting slot, and a vibration sensor group detachably arranged on the mounting rack. The positioning block is provided with a lead through hole adaptive to a sensor group wire. The rotating part of the electric slip ring is electrically connected with the sensor group of any vibration monitoring assembly, and the fixed part is connected with the power output end of the wind driven generator. According to the wind wheel, synchronous disassembly and assembly of the vibration sensor set are achieved, time is saved, and operation complexity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, and particularly to a wind wheel for a wind turbine with a vibration monitoring function. Background Technique

[0002] A wind turbine is a device that captures the kinetic energy of flowing air through wind turbine blades, first converts wind energy into mechanical energy, and then into electrical energy. It has many remarkable advantages. On the one hand, as a renewable and clean energy acquisition method, wind energy is inexhaustible and the power generation process is pollution-free. On the other hand, with the development of technology, its cost continues to decrease, its economic competitiveness continues to increase, it can also reduce dependence on imported energy, and ensure the safe and stable energy supply. Moreover, wind energy resources are widely distributed, suitable for development in many regions, and at the same time, the construction period of wind turbines is relatively short, and they can be put into use relatively quickly.

[0003] In the actual application of wind turbines, the vibration monitoring of blades is extremely important. First, it can ensure the safe operation and prevent the blades from being damaged, such as fatigue cracks, due to dynamic loads such as the thrust of the wind, and avoid the whole machine accident caused by blade failures, endangering the safety of personnel and equipment. Second, it can improve the power generation efficiency. By understanding the vibration characteristics of the blades, the operating parameters can be adjusted to reduce air resistance, improve the wind energy capture efficiency, and at the same time extend the blade life. In addition, it can also reduce the maintenance cost, realize early fault detection, so as to take preventive maintenance measures, and at the same time reasonably arrange the maintenance plan according to the vibration trend, improve the maintenance efficiency and reduce the downtime.

[0004] In the prior art, the all-round monitoring of vibration data is mainly achieved by installing multiple vibration sensors (such as acceleration sensors or strain sensors, etc.) on the blades and transmitting them to the background server in real time to realize the remote monitoring of the wind turbine blades. However, the multiple vibration sensors are disassembled and assembled independently (for example, screw installation or adhesive fixation), and there is a problem that the installation or disassembly process is cumbersome.

[0005] In view of the cumbersome nature of the independent disassembly and assembly of multiple vibration sensors on the wind turbine blades, it is extremely urgent to solve this complex disassembly and assembly problem. This can not only improve the installation and disassembly efficiency, reduce the labor and time costs, but also ensure the stability and reliability of the vibration monitoring system, and provide a strong guarantee for the safe operation, efficient power generation and low-cost maintenance of wind turbines. Content of the Utility Model

[0006] The purpose of the utility model is to provide a wind wheel for a wind turbine with a vibration monitoring function, aiming to solve the technical problems in the above background technique.

[0007] The technical solution of the utility model is realized as follows:

[0008] The technical solution of this application provides a wind turbine rotor with a vibration monitoring function, including:

[0009] A hub for connecting the main shaft of the above-mentioned wind turbine;

[0010] Blades detachably arranged on the above-mentioned hub, and mounting slots are arranged on the side surface connected to the above-mentioned hub;

[0011] Wherein, the number of the above-mentioned blades is multiple, and the multiple above-mentioned blades are evenly spaced along the circumferential direction of the above-mentioned hub;

[0012] Vibration monitoring components, the number of which is equal to the number of the above-mentioned blades, and respectively match with the multiple above-mentioned blades one by one;

[0013] Wherein, the above-mentioned vibration monitoring component includes a mounting frame, a positioning block and a vibration sensor group. The mounting frame and the above-mentioned mounting slot are in plug-in fit. The positioning block is detachably arranged at the notch of the above-mentioned mounting slot for positioning the above-mentioned mounting frame. The vibration sensor group is detachably arranged on the mounting frame. The positioning block is provided with a lead through hole for adapting the wires of the above-mentioned vibration sensor group; and

[0014] An electric slip ring, including a rotating part and a fixed part that cooperate with each other. The rotating part is electrically connected to the vibration sensor group of any one of the above-mentioned vibration monitoring components at the same time, and the fixed part is used for electrically connecting to the power output end of the above-mentioned wind turbine.

[0015] A further technical solution is that the above-mentioned vibration sensor group includes an acceleration sensor, a strain sensor and a fiber Bragg grating sensor, and the above-mentioned acceleration sensor, the above-mentioned strain sensor and the above-mentioned fiber Bragg grating sensor are all detachably arranged on the above-mentioned mounting frame.

[0016] A further technical solution is that the above-mentioned mounting slot includes a first slot and a second slot that are communicated with each other and arranged coaxially. The caliber of the first slot is smaller than that of the second slot, and one end of the second slot far from the first slot penetrates to the side surface of the root of the blade;

[0017] Wherein, the mounting frame and the first slot are in plug-in fit, and the positioning block is detachably arranged in the second slot.

[0018] A further technical solution is that the above-mentioned first slot includes a cylindrical slot and a strip slot that are communicated with each other, and the strip slot is arranged on the outer periphery of the cylindrical slot;

[0019] Among them, the above-mentioned mounting bracket includes two cylindrical blocks arranged in parallel and at intervals, and any one of the above-mentioned cylindrical blocks is inserted and matched with the above-mentioned cylindrical groove. A connecting strip for connecting the two is arranged between the two above-mentioned cylindrical blocks, which is used for detachably connecting the acceleration sensor, the strain sensor and the fiber Bragg grating sensor. An insertion block is arranged on the outer periphery of any one of the above-mentioned cylindrical blocks, which is used for inserting and matching with the above-mentioned strip-shaped groove.

[0020] A further technical solution is that the number of the above-mentioned connecting strips is three, and the three above-mentioned connecting strips are evenly arranged at intervals along the circumferential direction of the above-mentioned cylindrical block;

[0021] Among them, the above-mentioned acceleration sensor, strain sensor and fiber Bragg grating sensor are respectively arranged on the three above-mentioned connecting strips.

[0022] A further technical solution is that the whole formed by the two above-mentioned cylindrical blocks and the three above-mentioned connecting strips is an integrally formed structure.

[0023] A further technical solution is that the above-mentioned positioning block and the above-mentioned second slot are connected by a bolt group.

[0024] A further technical solution is that the above-mentioned positioning block is located inside the above-mentioned second slot.

[0025] A further technical solution is that any one of the above-mentioned blades and the above-mentioned hub are connected by a flange bolt structure.

[0026] Compared with the prior art, the technical solution of the present utility model has at least the following advantages or beneficial effects:

[0027] When the installation operation is carried out in this application, the specific steps are as follows: First, install the vibration sensor group on the mounting bracket. Then, position the whole of the mounting bracket and the vibration sensor group in the installation slot at the root of the blade. Subsequently, install the positioning block at the notch of the installation slot, which can achieve precise positioning of the mounting bracket and effectively avoid the shaking of the mounting bracket. In this way, the stability of the installation and positioning of the vibration sensor group is greatly improved. Stable installation and positioning are beneficial to ensuring the accuracy of data detection of the vibration sensor group. Finally, install the blade on the hub to complete the installation of the blade. On the contrary, the vibration sensor group can be disassembled according to the opposite steps. In this application, the synchronous disassembly and assembly of the vibration sensor group can be realized. Compared with the traditional independent disassembly and assembly method, this synchronous disassembly and assembly method is more convenient and fast, and has strong practicability. It not only saves the time of installation and disassembly, but also reduces the complexity of operation, providing convenience for the maintenance and overhaul of wind turbines. Description of the Drawings

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0029] Figure 1 FIG. is a schematic structural diagram of a wind turbine rotor with a vibration monitoring function according to an embodiment of the present invention;

[0030] Figure 2 FIG.

[0029] is an exploded view of a wind turbine rotor with a vibration monitoring function according to an embodiment of the present invention;

[0031] Figure 3 FIG. Figure 1 is a schematic structural diagram of the cooperation between the mounting bracket and the vibration sensor group according to an embodiment of the present invention;

[0032] Figure 4 is Figure 3 a cross-sectional view of;

[0033] Figure 5 FIG. is a partial schematic diagram of a blade according to an embodiment of the present invention;

[0034] Figure 6 FIG.

[0033] is a partial cross-sectional view of a blade according to an embodiment of the present invention;

[0035] Figure 7 FIG. Figure 5 is a schematic structural diagram of a positioning block according to an embodiment of the present invention.

[0036] Reference numerals: 100 - hub, 110 - annular connecting member, 120 - protective shell, 200 - blade, 300 - main shaft, 400 - mounting bracket, 410 - cylindrical block, 420 - insertion block, 430 - connecting bar, 500 - positioning block, 510 - lead through hole, 600 - electric slip ring, 700 - vibration sensor group, 710 - acceleration sensor, 720 - strain sensor, 730 - fiber Bragg grating sensor, 800 - mounting slot, 810 - first slot, 8101 - strip-shaped slot, 8102 - cylindrical slot, 820 - second slot, 900 - flange bolt structure. Detailed implementation manners

[0037] Embodiment 1

[0038] Please refer to Figures 1-7, an embodiment of the present application provides a wind turbine rotor with a vibration monitoring function, which includes a hub 100 and three blades 200 arranged on the outer circumference of the hub 100. The three blades 200 are evenly spaced along the circumferential direction of the hub 100. The blades 200 and the hub 100 are connected by a flange bolt structure 900, which can realize the quick installation or disassembly of the blades 200 and the hub 100. A vibration monitoring component is provided for any one of the blades 200.

[0039] Among them, the vibration monitoring component includes a mounting frame 400, a positioning block 500, and a vibration sensor group 700. The mounting frame 400 is in plug-in fit with the mounting slot 800. The positioning block 500 is detachably arranged at the notch of the mounting slot 800 for positioning the mounting frame 400. The vibration sensor group 700 is detachably arranged on the mounting frame 400, and the positioning block 500 is also provided with a lead through hole 510 to adapt to the wires of the vibration sensor group 700. The vibration sensor group 700 includes an acceleration sensor 710, a strain sensor 720, and a fiber Bragg grating sensor 730. The acceleration sensor 710, the strain sensor 720, and the fiber Bragg grating sensor 730 are all detachably arranged on the mounting frame 400. The acceleration sensor 710 reflects the vibration condition by measuring the acceleration change of the blade 200 during vibration. When the blade 200 vibrates, the mass block in the acceleration sensor 710 will generate an inertial force proportional to the acceleration. By measuring this inertial force, the acceleration value can be calculated. The strain sensor 720 indirectly reflects the vibration condition by measuring the strain change of the blade 200 during vibration. When the blade 200 vibrates, the strain on its surface or inside will change. The strain sensor 720 can detect these changes and convert them into electrical signals for output. The fiber Bragg grating sensor 730 measures the strain and temperature changes of the blade 200 by using the wavelength change of the fiber Bragg grating, and then indirectly reflects the vibration condition of the blade 200. When the blade 200 vibrates, it will cause the strain and temperature changes of the fiber Bragg grating, resulting in the change of the reflection wavelength of the fiber Bragg grating. By measuring this wavelength change, the vibration condition of the blade 200 can be calculated.

[0040] Furthermore, the hub 100 is also provided with a slip ring 600, which includes a rotating part and a fixed part that cooperate with each other. The rotating part is electrically connected to the vibration sensor group 700 of any vibration monitoring component at the same time, and the fixed part is used to be electrically connected to the power output end of the wind turbine. It should be noted that the slip ring 600 is mainly composed of a rotating part (rotor), a fixed part (stator), a brush (or contact piece), insulating material, a housing, etc. The rotating part is usually connected to equipment components that need to rotate, such as the wind turbine blade 200, and is composed of metal rings for conducting current and signals; the fixed part is connected to the fixed equipment structure and includes brushes or contact pieces that contact the rotating part; the brushes are made of conductive materials such as carbon brushes or metal contact pieces and are in close contact with the conductive rings of the rotating part to achieve current and signal transmission; the insulating material is used to isolate different conductive paths to prevent short circuits and signal interference; the housing can protect the internal structure and play roles such as dust-proof and waterproof to ensure the normal operation of the slip ring 600 in a harsh environment. The slip ring 600 is an existing device and will not be described in detail here.

[0041] When performing the installation operation in this application, the specific steps are as follows: First, install the vibration sensor group 700 on the mounting bracket 400. Then, position the whole of the mounting bracket 400 and the vibration sensor group 700 in the mounting slot 800 at the root of the blade 200. Subsequently, install the positioning block 500 at the notch of the mounting slot 800, which can achieve precise positioning of the mounting bracket 400 and effectively avoid the shaking of the mounting bracket 400. In this way, the stability of the installation and positioning of the vibration sensor group 700 is greatly improved. Stable installation and positioning are beneficial to ensuring the accuracy of data detection of the vibration sensor group 700. Finally, install the blade 200 on the hub 100, thus completing the installation of the blade 200. Conversely, the vibration sensor group 700 can be disassembled according to the reverse steps. In this application, the synchronous disassembly and assembly of the vibration sensor group 700 can be achieved. Compared with the traditional independent disassembly and assembly method, this synchronous disassembly and assembly method is more convenient and fast, and has strong practicability. It not only saves the time of installation and disassembly, but also reduces the complexity of operation, providing convenience for the maintenance and repair of the wind turbine.

[0042] Specifically, the hub 100 includes an annular connecting piece 110 and a protective shell 120. The blade 200 is arranged on the outer ring surface of the annular connecting piece 110, and the protective shell 120 covers one end of the annular connecting piece 110 and encloses an installation space with the annular connecting piece 110, and the slip ring 600 is arranged in this installation space. The design of the protective shell 120 plays a good sealing role in the port of the annular connecting piece 110. It not only avoids the damage of the outer slip ring by external factors (such as rainwater), but also blocks the intrusion of external dust into the interior of the wind turbine through the annular connecting piece 110, effectively ensuring the normal and stable operation of the wind turbine.

[0043] Example 2

[0044] Please refer to Figures 3-7 , this embodiment is the same as the main body of Embodiment 1, and the main difference is that: the above-mentioned installation slot 800 includes a first slot 810 and a second slot 820 that are communicated with each other and arranged coaxially. The diameter of the first slot 810 is smaller than that of the second slot 820. One end of the second slot 820 far from the first slot 810 penetrates to the side of the root of the blade 200;

[0045] Among them, the above-mentioned mounting bracket 400 is inserted and matched with the first slot 810, and the positioning block 500 is detachably arranged in the second slot 820.

[0046] In the above embodiment, when the positioning block 500 is installed in the second slot 820, the slot opening of the first slot 810 can be sealed, so that the mounting bracket 400 is firmly fixed in the first slot 810, effectively preventing the mounting bracket 400 from sliding out of the first slot 810. In addition, when the positioning block 500 is installed in the second slot 820, the positioning block 500 will abut against the mounting bracket 400, further improving the stability of the mounting bracket 400.

[0047] In some embodiments of the present invention, the first slot 810 includes a cylindrical slot 8102 and a strip slot 8101 that are communicated with each other, and the strip slot 8101 is arranged on the outer periphery of the cylindrical slot 8102;

[0048] Among them, the above-mentioned mounting bracket 400 includes two cylindrical blocks 410 that are parallel and spaced apart. Any one of the cylindrical blocks 410 is inserted and matched with the cylindrical slot 8102. A connecting strip 430 for connecting the two is arranged between the two cylindrical blocks 410, which is used for detachably connecting the acceleration sensor 710, the strain sensor 720, and the fiber Bragg grating sensor 730. An insertion block 420 is arranged on the outer periphery of any one of the cylindrical blocks 410 for insertion and matching with the strip slot 8101.

[0049] In the above embodiment, when the cylindrical block 410 is docked with the cylindrical slot 8102, the outer ring surface of the cylindrical block 410 contacts the side wall of the cylindrical slot 8102, which can effectively prevent the mounting bracket 400 from shaking. In addition, the insertion and matching of the insertion block 420 and the strip slot 8101 can effectively prevent the mounting bracket 400 from rotating, thereby greatly improving the stability of the docking between the mounting bracket 400 and the first slot 810.

[0050] Optionally, the number of the above-mentioned strip grooves 8101 is four, and the four strip grooves 8101 are evenly spaced along the circumferential direction of the cylindrical block 410. And four insertion blocks 420 are arranged on the cylindrical block 410, and are respectively inserted and matched with the four strip grooves 8101, so as to further improve the stability of the docking between the mounting frame 400 and the first slot 810.

[0051] In some embodiments of the present utility model, the number of the above-mentioned connecting strips 430 is three, and the three connecting strips 430 are evenly spaced along the circumferential direction of the cylindrical block 410;

[0052] Among them, the above-mentioned acceleration sensor 710, strain sensor 720 and fiber Bragg grating sensor 730 are respectively arranged on the three connecting strips 430.

[0053] In the above-mentioned embodiment, the above-mentioned acceleration sensor 710, strain sensor 720 and fiber Bragg grating sensor 730 are all installed on the corresponding connecting strip 430 through a bolt group, so as to realize the rapid installation or disassembly of the sensor (acceleration sensor 710, strain sensor 720 or fiber Bragg grating sensor 730).

[0054] Furthermore, the whole composed of the two cylindrical blocks 410 and the three connecting strips 430 is processed by an integral molding process, which is beneficial to improving the structural stability of the molded mounting frame 400.

[0055] In some embodiments of the present utility model, the above-mentioned positioning block 500 and the second slot 820 are connected by a bolt group.

[0056] In the above-mentioned embodiment, by adopting the connection method of the bolt group, the rapid disassembly and installation of the positioning block 500 can be realized. In addition, a notch is arranged on the outer side of the positioning block 500, and its function is to adapt to the head of the bolt, so as to avoid the head of the bolt protruding from the outer side of the positioning block 500, and further prevent the assembly of the blade 200 from being affected.

[0057] Furthermore, by arranging the positioning block 500 inside the second slot 820, it is possible to avoid the positioning block 500 protruding from the second slot 820, thereby preventing the assembly of the blade 200 from being affected.

[0058] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A wind turbine rotor with vibration monitoring function, characterized in that, Comprising: A hub (100) for connecting to the main shaft (300) of the wind turbine; Blades (200) detachably arranged on the hub (100), and mounting slots (800) are provided on the side surface connected to the hub (100); Wherein, the number of the blades (200) is multiple, and the multiple blades (200) are evenly spaced along the circumferential direction of the hub (100); Vibration monitoring components, the number of which is equal to the number of the blades (200), and respectively match with the multiple blades (200) one by one; Wherein, the vibration monitoring component includes a mounting frame (400), a positioning block (500) and a vibration sensor group (700), the mounting frame (400) is in plug-in fit with the mounting slot (800), the positioning block (500) is detachably arranged at the notch of the mounting slot (800) for positioning the mounting frame (400), the vibration sensor group (700) is detachably arranged on the mounting frame (400), and the positioning block (500) is provided with a lead through hole (510) for adapting to the wires of the vibration sensor group (700); and An electric slip ring (600), including a rotating part and a fixed part that cooperate with each other, the rotating part is electrically connected to the vibration sensor group (700) of any one of the vibration monitoring components, and the fixed part is used for electrically connecting to the power output end of the wind turbine.

2. The wind wheel for a wind turbine with a vibration monitoring function according to claim 1, characterized in that, The vibration sensor group (700) includes an acceleration sensor (710), a strain sensor (720) and a fiber Bragg grating sensor (730), and the acceleration sensor (710), the strain sensor (720) and the fiber Bragg grating sensor (730) are all detachably arranged on the mounting frame (400).

3. The wind turbine rotor with vibration monitoring function according to claim 2, characterized in that, The mounting slot (800) includes a first slot (810) and a second slot (820) that are communicated with each other and coaxially arranged, the diameter of the first slot (810) is smaller than the diameter of the second slot (820), and one end of the second slot (820) far from the first slot (810) penetrates to the side surface of the root of the blade (200); Wherein, the mounting frame (400) is in plug-in fit with the first slot (810), and the positioning block (500) is detachably arranged in the second slot (820).

4. The wind wheel for a wind turbine with a vibration monitoring function according to claim 3, characterized in that, The first slot (810) includes a cylindrical slot (8102) and a strip-shaped slot (8101) that are communicated with each other, and the strip-shaped slot (8101) is arranged on the outer periphery of the cylindrical slot (8102); Among them, the mounting bracket (400) includes two cylindrical blocks (410) arranged in parallel and at intervals. Any one of the cylindrical blocks (410) is inserted and matched with the cylindrical groove (8102). A connecting strip (430) for connecting the two is arranged between the two cylindrical blocks (410) and is used for detachably connecting the acceleration sensor (710), the strain sensor (720), and the fiber Bragg grating sensor (730). An insertion block (420) is arranged on the outer periphery of any one of the cylindrical blocks (410) and is used for inserting and matching with the strip-shaped groove (8101).

5. The wind turbine rotor with vibration monitoring function according to claim 4, characterized in that, The number of the connecting strips (430) is three, and the three connecting strips (430) are evenly arranged at intervals along the circumferential direction of the cylindrical block (410); Among them, the acceleration sensor (710), the strain sensor (720), and the fiber Bragg grating sensor (730) are respectively arranged on the three connecting strips (430).

6. The wind wheel for a wind turbine with a vibration monitoring function according to claim 5, characterized in that, The whole formed by the two cylindrical blocks (410) and the three connecting strips (430) is an integrally formed structure.

7. A wind turbine rotor with vibration monitoring function according to claim 3, characterized in that, The positioning block (500) and the second slot (820) are connected by a bolt group.

8. A wind turbine rotor with vibration monitoring function according to claim 7, characterized in that, The positioning block (500) is located inside the second slot (820).

9. The wind turbine rotor with vibration monitoring function according to claim 1, characterized in that, Any one of the blades (200) and the hub (100) are connected by a flange bolt structure (900).

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