Optical fiber strain load monitoring system for power generation fan

Abstract

The utility model relates to the technical field of power generation fans, in particular to a power generation fan optical fiber strain load monitoring system, which comprises a plurality of groups of strain sensors, each group of strain sensors comprises a plurality of strain units arranged on the inner wall of a power generation fan blade or a barrel, and the plurality of strain units are arranged at equal intervals and are positioned in the same circumference; and a plurality of junction boxes, wherein each junction box corresponds to one group of strain sensors. According to the optical fiber strain load monitoring system provided by the utility model, the strain unit is connected to the structural inner wall of the power generation fan through the base, the base can be detachably connected to the connecting seat, and the connecting seat can carry the optical fiber strain sensor and the infrared laser positioning part. The installation position of the current set of strain units can be achieved through the infrared laser positioning component, the optical fiber strain sensor can be rapidly installed on the connecting base and then connected with the optical fiber bundle through the optical fiber connector, and therefore the arrangement and installation difficulty of the sensor is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power generation fan, concretely relates to power generation fan optical fiber strain load monitoring system. BACKGROUND

[0002] With the continuous progress of wind power generation technology, wind turbine is developing towards large-scale and complex. As the key component of wind turbine, the running state of blade directly affects the efficiency and safety of the whole wind turbine. However, the blade bears irregular, variable load wind force in the running process, which is easy to produce overload, fatigue and other hidden troubles, and even suffers the damage of natural disasters such as icing and lightning.

[0003] Because the optical fiber sensor has the advantages of intrinsic safety, no electromagnetic interference, lightning resistance, corrosion resistance and long service life, it is particularly suitable for monitoring in such harsh environment as wind turbine blade. The monitoring system based on optical fiber sensor is usually composed of sensor, signal transmission device, data acquisition and processing system and other parts. The sensor is responsible for collecting the strain and deformation data of the blade and the cylinder, and the signal transmission device transmits the data to the data acquisition and processing system for analysis and processing.

[0004] At present, the optical fiber sensor is connected to the specific position of the power generation fan by field bonding. Because the structure of wind turbine blade and cylinder is complex and the size is large, the arrangement and installation of sensor are difficult, which is not conducive to the construction of optical fiber strain load monitoring system. UTILITY MODEL CONTENT

[0005] In view of the technical problems existing in the prior art optical fiber strain monitoring system, the utility model provides a kind of power generation fan optical fiber strain load monitoring system, comprising:

[0006] Multiple groups of strain sensors, each group of strain sensors includes multiple strain units arranged on the inner wall of the blade or cylinder of the power generation fan, and the multiple strain units are arranged at equal intervals and are in the same circumference;

[0007] Multiple junction boxes, each junction box corresponds to a group of strain sensors, and the junction box is connected with multiple strain units by optical fiber bundle;

[0008] Demodulator, connected with the junction box by optical fiber bundle;

[0009] Control cabinet, electrically connected with the demodulator;

[0010] The strain unit comprises a base, a connecting seat and a fiber strain sensor, the base is connected to a predetermined position of the power generating fan blade or the inner wall of the cylinder through an adhesive layer, at least two connecting seats are detachably connected to the base, and the connecting seat is used for connecting the fiber strain sensor and an infrared laser positioning component.

[0011] Preferably, the base comprises a plurality of connecting blocks arranged in a ring shape, the connecting blocks are provided with insertion holes, adjacent connecting blocks are connected through sheet-shaped connecting structures, and the thickness of the sheet-shaped connecting structures is lower than the thickness of the connecting blocks, so that gaps are formed between adjacent connecting blocks.

[0012] Preferably, the connecting seat is provided with a plug below, the plug can be inserted into the insertion hole, and the side surface of the connecting block is further provided with a positioning hole, and after the plug is inserted into the insertion hole, the plug can be fixed by a positioning pin inserted into the positioning hole.

[0013] Preferably, the connecting block and the connecting seat are rigidly connected.

[0014] Preferably, the first end of the connecting seat is provided with a connecting hole, the second end of the fiber strain sensor is provided with a connector plug, the fiber strain sensor is connected into the connecting hole of every two connecting seats, and the fiber bundle is connected to the connector through plug-in connection.

[0015] Preferably, the distance between the sheet-shaped connecting structure and the bottom surface of the connecting block is greater than 3 mm.

[0016] Preferably, the distance between the sheet-shaped connecting structure and the bottom surface of the connecting block is greater than 3 mm.

[0017] Preferably, the fiber strain sensor comprises a Bragg grating sensor.

[0018] Compared with the prior art, the utility model has the advantages that:

[0019] The fiber strain load monitoring system disclosed by the utility model is characterized in that the strain unit is connected to the inner wall of the structure of the power generating fan through the base, the base can be detachably connected to the connecting seat, the connecting seat can carry the fiber strain sensor and the infrared laser positioning component, the installation position of the current group of strain units can be realized by using the infrared laser positioning component, the fiber strain sensor can be quickly installed on the connecting seat, and then the fiber strain sensor is connected to the fiber bundle through the fiber connector, so that the arrangement and installation difficulty of the sensor are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures can be represented by a like numeral. For purposes of clarity, not every component can be called out in every drawing. There will now be described, by way of example, various aspects of the application with reference to the accompanying drawings in which:

[0021] Figure 1 is a structural schematic view of the power generating fan optical fiber strain load monitoring system shown in the utility model;

[0022] Figure 2 is a schematic view of the strain sensor in the power generating fan blade or cylinder inner wall shown in the utility model;

[0023] Figure 3 is a structural schematic view of the strain unit shown in the utility model;

[0024] Figure 4 is a structural schematic view of the base shown in the utility model;

[0025] Figure 5 is a structural schematic view of the optical fiber strain sensor mounted to the base shown in the utility model. DETAILED DESCRIPTION

[0026] In order to better understand the technical content of the utility model, specific embodiments are described below with the accompanying drawings.

[0027] In combination with Figure 1 shown, the utility model proposes a kind of power generating fan optical fiber strain load monitoring system, including multiple groups of strain sensors, multiple junction boxes, demodulator and control cabinet, multiple groups of strain sensors are respectively arranged at the root of power generating fan blade and the top and bottom position of cylinder inner wall.

[0028] In combination with Figure 2 shown, each group of strain sensors includes multiple strain units 24, multiple strain units 24 are arranged at equal intervals, and are in the same circumference.

[0029] Further, each junction box corresponds to a group of strain sensors, the junction box is connected with multiple strain units 24 by fiber bundle 25, the demodulator is connected with the junction box by fiber bundle 25, and the control cabinet is electrically connected with the demodulator.

[0030] In optional embodiment, fiber strain sensor 244 includes Bragg grating sensor, Bragg grating sensor is very sensitive to mechanical stress, is suitable for measuring friction, torsion, pressure and the like, and fiber strain sensor 244 is connected with junction box by fiber bundle 25.

[0031] Further, the junction box transmits the signals from the strain sensors to the demodulator through the optical cable, the demodulator is responsible for converting the optical signal into an electrical signal and extracting the strain information therefrom, and the signal processed by the demodulator is transmitted to the control cabinet through a cable or other communication interface. This signal processing and transmission process ensures that the system can monitor the strain load in real time, providing an important basis for health monitoring and safety evaluation of engineering structures.

[0032] Specifically, taking the power fan blade as an example, four strain units 24 are arranged at each monitoring position in the inner wall of the power fan blade, which monitor the strain load at four positions of the power fan blade and reflect the strain load change of the power fan blade. Each strain unit 24 is connected to the first junction box 22 through the optical fiber bundle 25, the first junction box 22 in the three blades is connected to the first demodulator 21, and the first demodulator 21 is connected to the first control cabinet 20 through the wire bundle, thereby realizing strain monitoring of the three blades through the first control cabinet 20.

[0033] Specifically, taking the power fan cylinder as an example, four strain units 24 are arranged on the inner wall of the power fan cylinder, an upper monitoring ring 101 is arranged above the power fan cylinder, and a lower monitoring ring 102 is arranged below the power fan cylinder. The upper monitoring ring 101 and the lower monitoring ring 102 are each provided with four strain units 24, the four strain units 24 are connected to the second junction box 12 through the optical fiber bundle 25, the two second junction boxes 12 are connected to the second demodulator 11 through the optical fiber bundle, and the second demodulator 11 is connected to the second control cabinet 10 through the wire bundle, thereby realizing strain monitoring of the power fan cylinder through the second control cabinet 10.

[0034] In combination Figure 3 As shown in the figure, the strain unit 24 comprises a base 242, a connecting seat 243, and a fiber optic strain sensor 244. The base 242 is connected to a predetermined position of the inner wall of the power fan blade or cylinder through an adhesive layer 241. The base 242 is detachably connected to at least two connecting seats 243, and the connecting seat 243 is used to connect the fiber optic strain sensor 244 and the infrared laser positioning component.

[0035] The infrared laser positioning component can be an infrared laser emitter, which can emit linear laser and point laser. That is, after the diameter of the to-be-installed position is determined, the linear laser is projected onto the beam of the inner wall of the structure, which can accurately determine the axial position of other installation positions, so as to ensure that they are in the same axial section. Then, the point laser can determine the specific installation point, so that the four installation positions are intuitively displayed.

[0036] In this way, after the position of any one strain unit 24 in a group of strain units 24 is determined, the remaining positions of the inner wall of the power fan blade or cylinder can be positioned through the detachable infrared laser positioning component, which can reduce the difficulty of arranging the strain units and ensure the installation accuracy.

[0037] The adhesive layer 241 is formed by high-strength sealant, which makes the base 242 adhere tightly to the inner wall of the generator blade or cylinder. When the generator blade or cylinder structure deforms, the deformation can be effectively transmitted to the base 242, then to the connecting seat 243, and then to the fiber optic strain sensor 244, so that the structural deformation of the generator blade or cylinder can be effectively reflected by the fiber optic strain sensor 244.

[0038] Combination Figure 3 As shown, the base 242 includes a plurality of connecting blocks 242a arranged in a ring. The connecting blocks 242a are provided with insertion holes 242b. Adjacent connecting blocks 242a are connected by a sheet-like connecting structure 242c. The thickness of the sheet-like connecting structure 242c is lower than the thickness of the connecting blocks 242a, so that a gap 242d is formed between adjacent connecting blocks 242a.

[0039] In an optional embodiment, the spacing of gap 242d is greater than 5 mm.

[0040] In this way, there is space for deformation between multiple connecting blocks 242a, which can sensitively transmit the deformation of the structural components themselves.

[0041] Furthermore, based on the direction of the deformation to be monitored, two connecting seats 243 are arranged in a suitable direction, combined with... Figure 3 As shown, a pin is provided below the connector 243, which can be inserted into the socket 242b. The side of the connector 242a is also provided with a positioning hole 242e. After the pin is inserted into the socket 242b, it can be fixed by the positioning pin 245 inserted into the positioning hole 242e.

[0042] The connecting block 242a and the connecting seat 243 are rigidly connected.

[0043] Furthermore, the first end of the connector 243 is provided with a connection hole, and the second end of the fiber optic strain sensor 244 is provided with a connector plug. The fiber optic strain sensor 244 is connected to the connection holes of every two connectors 243, and the fiber optic bundle 25 is plugged into the connector.

[0044] Thus, the two ends of the fiber optic strain sensor 244 are respectively inserted into the connection holes of the connector 243, and the end of the fiber optic bundle 25 is provided with a female plug, which is connected to the connector. It can be seen that the connector 243 and the fiber optic strain sensor 244, as an independent strain monitoring unit, can be flexibly configured in any direction of the base 242, which also facilitates the insertion of the fiber optic bundle 25.

[0045] In an optional embodiment, the distance between the sheet-shaped connecting structure 242c and the bottom surface of the connecting block 242a is greater than 3mm. Thus, a concave-convex structure is formed below the base 242, which is beneficial to the reliable connection between the adhesive layer 241 and the base 242.

[0046] In combination with the above embodiments, the optical fiber strain load monitoring system provided by the utility model, the strain unit is connected to the structure inner wall of the power generation fan through the base, and the base can be detachably connected to the connecting seat; the connecting seat can carry the optical fiber strain sensor and the infrared laser positioning component; the current installation position of a group of strain units can be realized by using the infrared laser positioning component; the optical fiber strain sensor can be quickly installed to the connecting seat; and then the optical fiber connector is connected with the optical fiber bundle together, so that the arrangement and installation difficulty of the sensor are reduced.

[0047] Although the utility model has disclosed as above with preferred embodiments, it is not used to limit the utility model. Those skilled in the art of the utility model can make various changes and decorations without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be defined by the claims.

Claims

1. A power generating windmill optical fiber strain load monitoring system characterized by, The utility model relates to a kind of wind turbine blade strain sensor, including: Multiple groups of strain sensors, each group of strain sensors includes multiple strain units (24) arranged on the inner wall of the power generation fan blade or cylinder, multiple strain units (24) are arranged equidistantly and are in the same circumference; Multiple junction boxes, each of the junction boxes corresponds to a group of the strain sensors, and the junction boxes are connected with multiple strain units (24) by fiber optic bundle (25); A demodulator is connected to the junction boxes by fiber optic bundle (25); A control cabinet is electrically connected to the demodulator; Wherein, the strain unit (24) includes a base (242), a connecting seat (243) and a fiber optic strain sensor (244), the base (242) is connected to the inner wall of the power generation fan blade or cylinder at a predetermined position by an adhesive layer (241), and the base (242) is detachably connected to at least two connecting seats (243), the connecting seat (243) is used to connect the fiber optic strain sensor (244) and the infrared laser positioning component.

2. The power-generating windmill fiber optic strain load monitoring system of claim 1, wherein, The base (242) includes multiple connecting blocks (242a) arranged in a ring shape, the connecting blocks (242a) are provided with insertion holes (242b), adjacent connecting blocks (242a) are connected by sheet-shaped connecting structures (242c), and the thickness of the sheet-shaped connecting structure (242c) is lower than the thickness of the connecting block (242a), so that gaps (242d) are formed between adjacent connecting blocks (242a).

3. The power-generating windmill fiber optic strain load monitoring system of claim 2, wherein, The connecting seat (243) is provided with a latch below, the latch can be inserted into the insertion hole (242b), and the side surface of the connecting block (242a) is further provided with a positioning hole (242e), after the latch is inserted into the insertion hole (242b), the positioning pin (245) inserted into the positioning hole (242e) can be fixed.

4. The power-generating windmill fiber optic strain load monitoring system of claim 3, wherein, The connecting block (242a) and the connecting seat (243) are rigidly connected.

5. The power-generating windmill fiber optic strain load monitoring system of claim 1, wherein, The first end of the connecting seat (243) is provided with a connecting hole, the second end of the fiber optic strain sensor (244) is provided with a connector plug, the fiber optic strain sensor (244) is connected into the connecting hole of every two connecting seats (243), and the fiber optic bundle (25) is connected to the connector.

6. The power-generating windmill fiber optic strain load monitoring system of claim 2, wherein, The distance between the sheet-shaped connecting structure (242c) and the bottom surface of the connecting block (242a) is greater than 3mm.

7. The power-generating windmill fiber optic strain load monitoring system of claim 2, wherein, The distance between the gaps (242d) is greater than 5mm.

8. The power-generating windmill fiber optic strain load monitoring system of claim 1, wherein, The fiber optic strain sensor (244) includes a Bragg grating sensor.

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