CN214836881U

CN214836881U - Fan blade state monitoring device

Info

Publication number: CN214836881U
Application number: CN202120487898.5U
Authority: CN
Inventors: 刘子煌; 李华滨; 康文胜; 翁文; 江勇; 张平; 王鸿
Original assignee: Huaneng Fujian Liancheng New Energy Co ltd
Current assignee: Huaneng Fujian Liancheng New Energy Co ltd
Priority date: 2021-03-08
Filing date: 2021-03-08
Publication date: 2021-11-23
Anticipated expiration: 2031-03-08

Abstract

The utility model discloses a fan blade state monitoring device, which comprises a sensor external member, a second optical splitter, an MPO optical cable and an optical fiber demodulator, wherein the optical fiber demodulator is connected with three groups of sensor external members through the second optical splitter, the sensor external member is arranged in a fan blade, the sensor external member comprises an optical fiber acceleration sensor, an optical fiber strain sensor, an optical fiber temperature compensation sensor, an optical branching box and a first optical splitter, the optical fiber acceleration sensor, the optical fiber strain sensor and the optical fiber temperature compensation sensor are connected with the optical transmission of the branch end of the second optical splitter through the branch end of the first optical splitter, the optical fiber demodulator is connected with the optical transmission of the second optical splitter through the MPO optical cable, and the problem that the prior fan blade monitoring adopts an electrical sensor to acquire data to easily cause the blade to be struck by lightning is solved, the system has the advantages of simple and convenient networking, strong lightning-resistant and anti-interference capability, long service life, strong multiplexing capability and the like.

Description

Fan blade state monitoring device

Technical Field

The utility model relates to a aerogenerator field especially relates to a fan blade state monitoring devices.

Background

At present, the accumulated installed capacity of wind power in China is close to 1 hundred million kilowatts and is the first place in the world, and the installed target is 2 hundred million kilowatts in 2020, which means huge operation and maintenance markets. The blade in the wind generating set is an important component, and transfers the generated power to the fan under the action of wind force, so that the fan obtains corresponding rotating speed. The unit is arranged at wind ports of mountains, wildlands, beaches, islands and the like, and is affected by irregular direction-changing and load-changing wind power and strong gust impact, so that the unit is affected by severe summer and cold weather and extreme temperature difference all the year round, and is inconvenient in traffic in the natural environment, and once a blade fails, the blade is difficult to find in time and is very difficult to repair. A large number of practices prove that most faults are phenomena of blade cracking, skin peeling, strength reduction, lightning stroke damage and the like, and if the faults are not processed in time, the blades are irreversibly and seriously damaged, so that the blades are thoroughly damaged. At present, the monitoring of the fan blade is generally acquired by adopting an electrical sensor, and the sensor needs an extra power supply sensor to be installed inside the blade, so that the blade is easily struck by lightning. The online monitoring system based on the optical fiber sensing technology can realize long-term online monitoring on the temperature, load and vibration of the blades, the tower barrel and the tower footing of the wind turbine generator and the bolt pre-tightening force of the blade root and the tower barrel, and has the advantages of simplicity and convenience in networking, strong lightning-resistant and anti-interference capacity, long service life, strong multiplexing capacity and the like compared with electrical monitoring.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fan blade state monitoring device, adopt the problem that electricity sensor data collection leads to the blade to suffer the thunderbolt easily to present fan blade monitoring, adopt the light to realize carrying out long-term on-line monitoring to signals such as the bolt pretightning force of the temperature, load, vibration and blade root and the tower section of thick bamboo of wind turbine generator system blade, a tower section of thick bamboo and column foot based on optical fiber sensing technique on-line monitoring system to optical monitoring has advantages such as the network deployment is simple and convenient, long service life and multiplexing ability are strong.

In order to achieve the above purpose, the utility model adopts the following scheme:

the utility model provides a fan blade state monitoring devices, includes sensor external member, second optical splitter, MPO optical cable, optical fiber demodulator passes through second optical splitter branch connection has three group's sensor external members, the sensor external member is installed in the fan blade, the sensor external member includes optic fibre acceleration sensor optic fibre strain transducer optic fibre temperature compensation sensor, optical branching box, first optical splitter, optic fibre acceleration sensor optic fibre strain transducer optic fibre temperature compensation sensor pass through the branch end of first optical splitter with the branch end optical transmission of second optical splitter is connected, optical fiber demodulator pass through the MPO optical cable with second optical splitter optical transmission is connected.

The fan blade state monitoring device at least comprises four optical fiber strain sensors, and the optical fiber strain sensors are in optical transmission connection with branch ends of the first optical branch devices through branch ends of the optical branch boxes.

A fan blade state monitoring device is disclosed, the optical fiber demodulator comprises an ASE broadband light source, a tunable F-P filter, a third optical branch device, a first coupler, a second coupler, a circulator, a single-peak filter, a photoelectric conversion module, an analog-to-digital conversion module, a sawtooth wave generator, an FPGA, an ARM and an external interface, the optical fiber demodulator is composed of a plurality of channels in total, an F-P filtering demodulation method is adopted, the ASE broadband light source is incident to the tunable F-P filter, the sawtooth wave generator generates sawtooth wave voltage to drive the F-P filter to selectively transmit incident light, the transmitted light is divided into optical signals through the third optical branch device to be respectively sent to the first coupler of each channel, the first coupler is coupled with two optical signals, one of the optical signals is incident to the other second coupler, two coupled optical signals respectively enter the two unimodal filters, pass through the photoelectric conversion module and the analog-to-digital conversion module and then enter the FPGA for processing; and the other path of optical signal is transmitted to the optical fiber strain sensor after passing through the circulator and is reflected back to a spectrum signal, the reflected optical signal is transmitted to the photoelectric conversion module after passing through the circulator and is transmitted to the FPGA for processing after passing through the analog-to-digital conversion module, and the data processed by the FPGA is further processed by the ARM and then transmitted to an upper computer for displaying through the external interface.

The utility model provides a fan blade state monitoring devices possesses following advantage and beneficial effect: the utility model discloses a can realize carrying out long-term on-line monitoring to signals such as the bolt pretightning force of the temperature, load, vibration and blade root of wind turbine generator system blade, a tower section of thick bamboo and column foot through based on optical fiber sensing technique on-line monitoring system, compare that electrical monitoring has advantages such as the network deployment is simple and convenient, anti thunderbolt interference killing feature is strong, long service life, multiplexing ability are strong.

Drawings

Fig. 1 is a block diagram of the fan blade state monitoring device of the present invention.

Fig. 2 is the utility model discloses fan blade state monitoring devices's optic fibre demodulation appearance system block diagram.

The reference numbers in the figures denote:

1. an optical fiber acceleration sensor; 2. an optical fiber strain sensor; 3. an optical fiber temperature compensation sensor; 4. an optical branching box; 5. a first optical splitter; 6. a second optical splitter; 7. an MPO optical cable; 8. an optical fiber demodulator; 9. an ASE broadband light source; 10. a tunable F-P filter; 11. a third optical splitter; 12. a first coupler; 13. a second coupler; 14. a circulator; 15. A single-peak filter; 16. a photoelectric conversion module; 17. an analog-to-digital conversion module; 18. a sawtooth wave generator; 19. an FPGA; 20. ARM; 21. an external interface; 22. a sensor package.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 2, a fan blade condition monitoring device includes a sensor suite 22, a second optical splitter 6, an MPO optical cable 7, and a fiber demodulator 8.

The sensor suite 22 is installed in the fan blade, and the sensor suite 22 comprises an optical fiber acceleration sensor 1, an optical fiber strain sensor 2, an optical fiber temperature compensation sensor 3, an optical branching box 4 and a first optical splitter 5.

The optical fiber acceleration sensor 1 does not need to be powered, the frequency response range of the optical fiber acceleration sensor 1 is smaller than 500Hz, the amplitude of the optical fiber acceleration sensor is smaller than 2g, and the optical fiber acceleration sensor 1 collects vibration signals of the fan blade.

The optical fiber strain sensors 2 do not need to be powered, the measurement range is from-1500 micro to +1500 micro, at least four optical fiber strain sensors are used for each blade, and the optical fiber strain sensors 2 collect strain signals of the fan blades.

The optical fiber strain sensor 2 is in optical transmission connection with the branch end of the first optical branch device 5 through the branch end of the optical branching box 4, and the optical fiber temperature compensation sensor 3 collects temperature signals of the fan blade.

The optical fiber temperature compensation sensor 3 is made of stainless steel, does not need power supply, is used for compensating errors of the strain sensor caused by temperature, can measure the temperature of the blade, and is required to be close to the strain sensor during installation.

The optical fiber acceleration sensor 1, the optical fiber strain sensor 2 and the optical fiber temperature compensation sensor 3 are in optical transmission connection with a branch end of the second optical branch device 6 through a branch end of the first optical branch device 5.

And the optical fiber demodulator 8 is in optical transmission connection with the second optical splitter 6 through the MPO optical cable 7.

The optical fiber demodulator 8 comprises an ASE broadband light source 9, a tunable F-P filter 10, a third optical splitter 11, a first coupler 12, a second coupler 13, a circulator 14, a single-peak filter 15, a photoelectric conversion module 16, an analog-to-digital conversion module 17, a sawtooth wave generator 18, an FPGA19, an ARM20 and an external interface 21,

the optical fiber demodulator 8 is composed of 12 channels in total, and adopts an F-P filtering demodulation method.

The ASE broadband light source 9 is incident to the tunable F-P filter 10, and the sawtooth wave generator 18 generates sawtooth wave voltage to drive the F-P filter to selectively transmit the incident light.

The transmitted light is divided into 12 optical signals by the third optical splitter 11 and respectively provided to the first couplers 12 of 12 channels, the first couplers 12 couple out two optical signals,

one of the two optical signals is incident to the other second coupler 13, and the two coupled optical signals are respectively incident to the two unimodal filters 15, pass through the photoelectric conversion module 16 and the analog-to-digital conversion module 17, and then enter the FPGA19 for processing;

another optical signal is incident to the optical fiber strain sensor after passing through the circulator 14, and is reflected back to a spectrum signal, and the reflected optical signal is incident to the photoelectric conversion module 16 after passing through the circulator 14, and enters the FPGA19 for processing after passing through the analog-to-digital conversion module 17.

And after the data processed by the FPGA19 is further processed by the ARM20, the result is sent to an upper computer for display through the external interface 21.

The optical fiber regulator 8 receives the vibration signal, the strain signal and the temperature signal transmitted by the fan blade, calculates vibration data, strain data and temperature data, processes the data, calculates the current natural frequency and size of the fan blade, the size of load and the change condition of temperature, and judges the current running condition of the fan blade.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a fan blade state monitoring devices which characterized in that: comprises a sensor suite (22), a second optical branch device (6), an MPO optical cable (7) and an optical fiber demodulator (8), the optical fiber demodulator (8) is connected with three groups of sensor kits (22) through the second optical splitter (6) in a branching way, the sensor suite (22) is arranged in the fan blade, the sensor suite (22) comprises an optical fiber acceleration sensor (1), an optical fiber strain sensor (2), an optical fiber temperature compensation sensor (3), an optical branching box (4) and a first optical branching device (5), the optical fiber acceleration sensor (1), the optical fiber strain sensor (2) and the optical fiber temperature compensation sensor (3) are in optical transmission connection with the branch end of the second optical branch device (6) through the branch end of the first optical branch device (5), and the optical fiber demodulator (8) is in optical transmission connection with the second optical splitter (6) through the MPO optical cable (7).

2. A fan blade condition monitoring device as claimed in claim 1, wherein: the optical fiber strain sensors (2) at least comprise four optical fiber strain sensors, and the optical fiber strain sensors (2) are in optical transmission connection with the branch ends of the first optical branch devices (5) through the branch ends of the optical branching boxes (4).

3. A fan blade condition monitoring device as claimed in claim 1, wherein: the optical fiber demodulator (8) comprises an ASE broadband light source (9), a tunable F-P filter (10), a third optical splitter (11), a first coupler (12), a second coupler (13), a circulator (14), a single-peak filter (15), a photoelectric conversion module (16), an analog-to-digital conversion module (17), a sawtooth generator (18), an FPGA (19), an ARM (20) and an external interface (21), wherein the optical fiber demodulator (8) is composed of 12 channels in total, the ASE broadband light source (9) enters the tunable F-P filter (10) by adopting an F-P filtering demodulation method, the sawtooth generator (18) generates sawtooth wave voltage to drive the F-P filter to selectively transmit the incident light, the transmitted light is divided into 12 optical signals through the third optical splitter (11) and is respectively transmitted to the first couplers (12) of the 12 channels, the first coupler (12) couples two optical signals, wherein one optical signal is incident to the other second coupler (13), the two coupled optical signals are respectively incident to the two unimodal filters (15), and then enter the FPGA (19) for processing after passing through the photoelectric conversion module (16) and the analog-to-digital conversion module (17); and the other path of optical signal is incident to the optical fiber strain sensor after passing through the circulator (14) and is reflected back to a spectrum signal, the reflected optical signal is incident to the photoelectric conversion module (16) after passing through the circulator (14) and enters the FPGA (19) for processing after passing through the analog-to-digital conversion module (17), and the data processed by the FPGA (19) is further processed by the ARM (20) and then is sent to an upper computer for displaying through the external interface (21).