Gas turbine rotor pull rod online monitoring system and device

Abstract

The invention is suitable for the field of online monitoring of rotary machinery, and provides an online monitoring system and device for a pull rod of a gas turbine rotor. Firstly, an optical fiber comprising grating sensors is installed in a center hole of a pull rod, temperature calibration and tension calibration are conducted on the pull rod, and a relation curve between the transmission wavelength of each grating sensor and the temperature and a relation curve between the transmission wavelength of each grating sensor and the tension are determined; when the gas turbine rotor works, the optical fiber demodulation module determines transmission wavelength information, the transmission wavelength information is converted into a wireless signal through the transmitting module which is installed on the rotor and is in wired connection with the optical fiber demodulation module, the wireless signal is transmitted to the receiving module on the air cylinder, and the receiving module converts the wireless signal into the transmission wavelength information and forwards the transmission wavelength information to the stress analysis module. And the stress condition of the pull rod is determined according to the relation curve and the transmission wavelength information, so that the stress of the gas turbine rotor is monitored in real time. The problems of complex installation and difficult maintenance caused by wired connection inside and outside the gas turbine rotor in a traditional stress monitoring method are solved.

Description

Technical Field

[0001] The present application relates to the field of online monitoring of rotating machinery, and in particular to an online monitoring system and device for a combustion turbine rotor tie rod. Background Art

[0002] In modern machinery, stress monitoring of rotating components, such as combustion turbine rotors, is crucial for predicting equipment failures, improving operational safety, and extending equipment life. However, traditional stress monitoring methods for rotating components often rely on wired connections and battery power, making installation complex and maintenance difficult. These methods become particularly inconvenient and unreliable in high-speed environments. Summary of the Invention

[0003] In view of this, the present application provides an online monitoring system and device for a gas turbine rotor tie rod, which realizes real-time wireless measurement of stress on the gas turbine rotor and provides system power support through short-range wireless power supply, solving the problem of traditional methods requiring wired connection and battery power supply.

[0004] In a first aspect, the present application provides a combustion turbine rotor tie rod online monitoring system, the system comprising a tie rod calibration module, an optical fiber demodulation module, a wireless communication transmitting and receiving module, and a stress analysis module; The pull rod calibration module includes a pull rod and an optical fiber installed in the center hole of the pull rod. A plurality of grating sensors are prepared on the optical fiber, and the grating period of each grating sensor is different. The pull rod at the location of the grating sensor is subjected to segment-by-segment temperature calibration to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor. The pull rod is then subjected to tension and stretching calibration to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor. The optical fiber demodulation module is used to receive the transmitted light of the optical fiber, demodulate the transmitted light to obtain the transmission wavelength information of each grating sensor, and transmit the transmission wavelength information to the wireless communication transmitting module of the wireless communication transmitting and receiving module via wired transmission; The wireless communication transmitting and receiving module includes a wireless communication transmitting module installed on the rotor and a wireless communication receiving module installed on the cylinder, wherein the wireless communication transmitting module is physically connected to the optical fiber demodulation module, and is used to encode and modulate the transmission wavelength information into a wireless signal and transmit the wireless signal outward; the wireless communication receiving module is used to receive the wireless signal and demodulate and decode it into the transmission wavelength information; The stress analysis module is used to compare the first relationship curve, the second relationship curve and the transmission wavelength information to obtain the stress condition of the pull rod.

[0005] Optionally, the system further includes a wireless power transmission and reception module; The wireless power supply transmitting and receiving module includes a wireless power supply receiving module installed on the rotor and a wireless power supply transmitting module installed on the cylinder, wherein the wireless power supply transmitting module is used to convert electrical energy into electromagnetic waves and send them to the wireless power supply receiving module, and the wireless power supply receiving module is used to convert the electromagnetic waves into electrical energy.

[0006] Optionally, the grating sensor is a Bragg grating sensor.

[0007] Optionally, the step of performing temperature calibration on the pull rod at the location of the grating sensor section by section to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor includes: For any grating sensor, place the pull rod section where the grating sensor is located in the eddy current solenoid, adjust the current, and when the temperature is determined to be stable at a preset calibration temperature, record the transmission wavelength of the grating sensor; The above steps are respectively performed for a plurality of calibration temperatures to obtain a first relationship curve between the transmission wavelength and the temperature.

[0008] Optionally, the step of performing tension calibration on the pull rod to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor includes: A dynamometer is installed at one end of the pull rod, a tension is applied to the pull rod at a preset temperature, and the transmission wavelength of each grating sensor on the pull rod is determined. The tension is repeatedly adjusted and the transmission wavelength of each grating sensor on the pull rod is determined to obtain a corresponding relationship curve between the transmission wavelength and the tension at the preset temperature; Adjust the preset temperature, repeat the steps of determining the transmission wavelength of each grating sensor, and repeat the steps of adjusting the tension and determining the transmission wavelength of each grating sensor, so as to obtain a corresponding relationship curve between the transmission wavelength and tension of each grating sensor at different temperatures, and determine it as the second relationship curve.

[0009] Optionally, if the number of the pull rods is greater than one, a certain length of the optical fiber in each pull rod is reserved at both ends of the pull rod, and the optical fibers in different pull rods are fused end to end in sequence, so that the optical fibers in the above pull rods are connected in series to form a long optical fiber, and one end of the long optical fiber is connected to the light source, and the other end is connected to the optical fiber demodulation module.

[0010] A second aspect of the present application provides an online monitoring device for a gas turbine rotor tie rod, the device comprising a bearing 1, a rotor 2, an optical fiber 3, a wheel disc 4, a nut 5, a tie rod 6, a rotor module 7, a cylinder module 8, and a host computer 9; The bearing 1 is mounted on the rotor 2. An optical fiber 3 is mounted in the center hole of the pull rod 6. The pull rod 6 is mounted on the wheel disc 4 and fixed by a nut 5. Several grating sensors are prepared on the optical fiber 3. The pull rods at the locations of the grating sensors are temperature-calibrated section by section to obtain a first curve of the relationship between the transmission wavelength and temperature of each grating sensor. The pull rods are then tension-stretched to obtain a second curve of the relationship between the transmission wavelength and tension of each grating sensor. The rotor module 7 includes a light source, an optical fiber demodulation unit, and a wireless communication transmitting unit, wherein the optical fiber demodulation unit and the wireless communication transmitting unit are connected by wire; the optical fiber demodulation unit is used to receive the transmitted light of the optical fiber, demodulate the transmitted light to obtain the transmission wavelength information of each grating sensor, and transmit the transmission wavelength information to the wireless communication transmitting unit by wire; the wireless communication transmitting unit is used to encode and modulate the transmission wavelength information into a wireless signal, and transmit the wireless signal outward; The cylinder module 8 includes a wireless communication receiving unit for receiving the wireless signal, demodulating and decoding it into the transmission wavelength information, and sending it to the host computer 9; The host computer 9 is used to compare the first relationship curve, the second relationship curve and the transmission wavelength information to obtain the force condition of the pull rod.

[0011] Optionally, the rotor module 7 further includes a wireless power receiving unit, and the cylinder module 8 further includes a wireless power transmitting unit; The wireless power supply transmitting unit is used to convert electrical energy into electromagnetic waves and send them to the wireless power supply receiving unit, and the wireless power supply receiving unit is used to convert the electromagnetic waves into electrical energy.

[0012] Optionally, the grating sensor is a Bragg grating sensor; If the number of the pull rods is greater than one, a portion of the length of the optical fiber in each pull rod is reserved at both ends of the pull rod, and the optical fibers in different pull rods are fused end to end in sequence to connect the optical fibers in the above pull rods in series to form a long optical fiber, and one end of the long optical fiber is connected to the light source, and the other end is connected to the optical fiber demodulation module.

[0013] Optionally, the step of performing temperature calibration on the pull rod at the location of the grating sensor section by section to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor includes: For any grating sensor, the pull rod section at the location of the grating sensor is placed in an eddy current solenoid, the current is adjusted, and when the temperature is determined to be stable at a preset calibration temperature, the transmission wavelength of the grating sensor is recorded; the above steps are performed for multiple calibration temperatures to obtain a first relationship curve between the transmission wavelength and the temperature; The step of performing tension calibration on the pull rod to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor includes: A dynamometer is installed at one end of the pull rod, a tension is applied to the pull rod at a preset temperature, and the transmission wavelength of each grating sensor on the pull rod is determined. The tension is repeatedly adjusted and the transmission wavelength of each grating sensor on the pull rod is determined to obtain a corresponding relationship curve between the transmission wavelength and the tension at the preset temperature; Adjust the preset temperature, repeat the steps of determining the transmission wavelength of each grating sensor, and repeat the steps of adjusting the tension and determining the transmission wavelength of each grating sensor, so as to obtain a corresponding relationship curve between the transmission wavelength and tension of each grating sensor at different temperatures, and determine it as the second relationship curve.

[0014] In the embodiment provided herein, an optical fiber containing several grating sensors is first installed in the center hole of a tie rod. Each grating sensor has a different grating period, and its transmission wavelengths are spaced apart from each other by a distance, preventing mutual interference. This allows for accurate identification and location of a specific section of a tie rod. The tie rod is then temperature-calibrated and tension-calibrated to determine the transmission wavelength-temperature curve and the transmission wavelength-tension curve for each grating sensor within the tie rod. An optical fiber demodulation module then receives the transmitted light from the optical fiber and demodulates it to obtain the transmission wavelength information of the grating sensor. A wireless communication transmitter module, wiredly connected to the optical fiber demodulation module and mounted on the rotor, converts the transmission wavelength information into a wireless signal and transmits it externally. A wireless communication receiver module, mounted on the cylinder, receives the wireless signal, converts it into transmission wavelength information, and then forwards it to a stress analysis module, which determines the stress condition of the tie rod based on the first and second relationship curves and the transmission wavelength information. This solves the problem of traditional stress monitoring methods requiring wired connections between the inside and outside of the combustion turbine rotor, which results in complex installation and difficult maintenance.

[0015] Furthermore, the present application realizes wireless power supply inside and outside the combustion turbine rotor by installing a wireless power supply receiving module on the rotor and a wireless power supply transmitting module on the cylinder, thereby solving the problem that the traditional stress monitoring method relies on battery power, which leads to maintenance difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A system module diagram provided for an embodiment of the present application; Figure 2 Schematic diagram of the combustion turbine rotor tie rod online monitoring system provided in an embodiment of the present application; Figure 3 This is a diagram of the device structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0018] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0019] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0020] The present application provides a combustion turbine rotor tie rod online monitoring system and device to solve the problem that the traditional stress monitoring method requires wired connection and battery power supply inside and outside the combustion turbine rotor, resulting in complex installation and difficult maintenance.

[0021] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0022] like Figure 1 As shown, this is a system module diagram of a combustion turbine rotor tie rod online monitoring system provided by the present application. The system includes a tie rod calibration module, an optical fiber demodulation module, a wireless communication transmitting and receiving module, and a stress analysis module. The functions and effects of each module are described below.

[0023] Module 1, the drawbar calibration module, includes a drawbar, an optical fiber mounted within the drawbar's center hole, and several grating sensors mounted on the optical fiber. Temperature calibration is performed on the drawbar at the locations of the grating sensors to obtain a first curve showing the relationship between transmission wavelength and temperature for each grating sensor. Tension calibration is then performed on the drawbar to obtain a second curve showing the relationship between transmission wavelength and tension for each grating sensor.

[0024] In this module, multiple grating sensors are prepared on each optical fiber. The spacing distance between each grating sensor can be pre-set. The grating period of each grating sensor is different, and their transmission wavelengths are spaced a certain distance apart from each other without interfering with each other, so that a specific grating sensor can be accurately located through the characteristic wavelength, thereby accurately identifying and locating a specific position of a pull rod.

[0025] Typically, the tie rod of a gas turbine rotor is surrounded by several discs. Therefore, the spacing between optical grating sensors can also be determined based on the position of the discs. For example, if there are five discs on the tie rod, a optical grating sensor is installed at each of the five discs on the optical fiber inside the tie rod. After determining the position of each optical grating sensor, the optical fiber is threaded into the center hole of the tie rod according to that position. High-temperature resistant anaerobic adhesive is then used to seal the fiber to the inner wall of the tie rod.

[0026] After the optical fiber is installed, the pull rod needs to be calibrated for temperature and tension.

[0027] The temperature calibration method involves presetting several calibration temperatures, such as 20°C, 100°C, 200°C, and 300°C. After selecting one of these calibration temperatures, the rod segment at the grating sensor's location is placed in an eddy current solenoid. The current is adjusted until the temperature stabilizes at the selected calibration temperature, and the transmission wavelength of the grating sensor is recorded. Repeating these steps for each rod segment at each grating sensor's location yields the transmission wavelength for each grating sensor at that calibration temperature.

[0028] Select another calibration temperature and repeat the above steps to determine the transmission wavelength of each grating sensor. The corresponding relationship between the transmission wavelength and temperature at each calibration temperature is obtained, thereby determining the first transmission wavelength-temperature relationship curve. For example, using calibration temperatures of 20°C, 100°C, 200°C, and 300°C, and seven grating sensors, the corresponding relationship between the transmission wavelength and temperature at each calibration temperature is shown in the following table.

[0029] Temperature (°C) Sensor 1 (nm) Sensor 2(nm) Sensor 3(nm) Sensor 4(nm) Sensor 5(nm) Sensor 6(nm) Sensor 7(nm) 20 <![CDATA[λ T20,1 ]]> <![CDATA[λ T20,2 ]]> <![CDATA[λ T20,3 ]]> <![CDATA[λ T20,4 ]]> <![CDATA[λ T20,5 ]]> <![CDATA[λ T20,6 ]]> <![CDATA[λ T20,7 ]]> 100 <![CDATA[λ T100,1 ]]> <![CDATA[λ T100,2 ]]> <![CDATA[λ T100,3 ]]> <![CDATA[λ T100,4 ]]> <![CDATA[λ T100,5 ]]> <![CDATA[λ T100,6 ]]> <![CDATA[λ T100,7 ]]> 200 <![CDATA[λ T200,1 ]]> <![CDATA[λ T200,2 ]]> <![CDATA[λ T200,3 ]]> <![CDATA[λ T200,4 ]]> <![CDATA[λ T200,5 ]]> <![CDATA[λ T200,6 ]]> <![CDATA[λ T200,7 <!-- 4 -->]]> 300 <![CDATA[λ T300,1 ]]> <![CDATA[λ T300,2 ]]> <![CDATA[λ T300,3 ]]> <![CDATA[λ T300,4 ]]> <![CDATA[λ T300,5 ]]> <![CDATA[λ T300,6 ]]> <![CDATA[λ T300,7 ]]> The method for tensile calibration is: A dynamometer is installed at one end of the pull rod, and a tensile force is applied to the pull rod at a preset temperature to determine the transmission wavelength of each grating sensor on the pull rod. The tensile force is repeatedly adjusted and the transmission wavelength of each grating sensor on the pull rod is determined to obtain a corresponding relationship curve between the transmission wavelength and the tensile force at the preset temperature.

[0030] Adjust the preset temperature, then repeat the steps of determining the transmission wavelength of each grating sensor, and adjusting the tension and determining the transmission wavelength of each grating sensor, to obtain a corresponding relationship curve between the transmission wavelength and tension of each grating sensor at different temperatures, and determine this curve as the second relationship curve. Taking calibration temperatures of 20°C, 100°C, 200°C, and 300°C, and tensions of 200kN, 300kN, and 400kN as an example, the corresponding relationships between the transmission wavelength and tension of each grating sensor at different temperatures are shown in the following table: Temperature (°C) Tensile force (kN) Sensor 1(nm) Sensor 2(nm) Sensor 3(nm) …… 20 200 <![CDATA[λ T20,L200,1 ]]> <![CDATA[λ T20,L200,2 ]]> <![CDATA[λ T20,L200,3 ]]> …… 20 300 <![CDATA[λ T20,L300,1 ]]> <![CDATA[λ T20,L300,2 ]]> <![CDATA[λ T20,L300,3 ]]> …… 20 400 <![CDATA[λ T20,L400,1 ]]> <![CDATA[λ T20,L400,2 ]]> <![CDATA[λ T20,L400,3 ]]> …… 100 200 <![CDATA[λ T100,L200,1 ]]> <![CDATA[λ T100,L200,2 ]]> <![CDATA[λ T100,L200,3 ]]> …… 100 300 <![CDATA[λ T100,L300,1 ]]> <![CDATA[λ T100,L300,2 ]]> <![CDATA[λ T100,L300,3 ]]> …… 100 400 <![CDATA[λ T100,L400,1 ]]> <![CDATA[λ T100,L400,2 ]]> <![CDATA[λ T100,L400,3 ]]> …… 200 200 <![CDATA[λ T200,L200,1 ]]> <![CDATA[λ T200,L200,2 ]]> <![CDATA[λ T200,L200,3 ]]> …… 200 300 <![CDATA[λ T200,L300,1 ]]> <![CDATA[λ T200,L300,2 ]]> <![CDATA[λ T200,L300,3 ]]> …… 200 400 <![CDATA[λ T200,L400,1 ]]> <![CDATA[λ T200,L400,2 ]]> <![CDATA[λ T200,L400,3 ]]> …… 300 200 <![CDATA[λ T300,L200,1 ]]> <![CDATA[λ T300,L200,2 ]]> <![CDATA[λ T300,L200,3 ]]> …… 300 300 <![CDATA[λ T300,L300,1 ]]> <![CDATA[λ T300,L300,2 ]]> <![CDATA[λ T300,L300,3 ]]> …… 300 400 <![CDATA[λ T300,L400,1 ]]> <![CDATA[λ T300,L400,2 ]]> <![CDATA[λ T300,L400,3 ]]> …… Through the above steps, the temperature calibration and tension calibration of the pull rod can be achieved.

[0031] In another embodiment, the grating sensor is a Bragg grating sensor. Compared to conventional grating sensors, Bragg grating sensors can achieve sub-nanometer (pm-level) wavelength resolution, making them suitable for high-precision measurements. Furthermore, the signal of a Bragg grating sensor is wavelength-encoded, unaffected by factors such as light source intensity fluctuations and fiber bending losses. Therefore, Bragg grating sensors offer significant advantages in accuracy, anti-interference capabilities, multi-parameter sensing, distributed measurement, and long-term stability, making them particularly suitable for high-precision, long-distance, multi-point monitoring, and extreme environment monitoring. While conventional grating sensors are lower in cost, they cannot match the performance and functionality of Bragg grating sensors. In this embodiment, the grating sensor is designated as a Bragg grating sensor to improve accuracy.

[0032] In another embodiment, if the number of the pull rods is greater than one, a portion of the length of the optical fiber in each pull rod is reserved at both ends of the pull rod, and the optical fibers in different pull rods are fused end to end in sequence, so that the optical fibers in the above-mentioned pull rods are connected in series to form a long optical fiber, and one end of the long optical fiber is connected to the light source, and the other end is connected to the optical fiber demodulation module.

[0033] For distributed sensing and multi-tie rod monitoring scenarios, this module can connect the optical fibers in different tie rods to be monitored into a single long fiber. This not only simplifies installation and maintenance, but also improves data consistency and reliability.

[0034] Module 2, fiber demodulation module: This module is used to receive the transmitted light of the optical fiber, demodulate the transmitted light to obtain the transmission wavelength information of each grating sensor, and transmit the transmission wavelength information to the wireless communication transmitting module of the wireless communication transmitting and receiving module via wired transmission.

[0035] This module can be installed in the area inside the gas turbine where the rotor end temperature and centrifugal force are low, and the module is connected to the wireless communication transmission module also installed on the rotor by wire, so that the transmission wavelength information can be transmitted to the wireless communication transmission module.

[0036] Module 3, wireless communication transmitting and receiving module. This module includes a wireless communication transmitting module mounted on the rotor and a wireless communication receiving module mounted on the cylinder. The wireless communication transmitting module is physically connected to the optical fiber demodulation module and is used to encode and modulate the transmission wavelength information into a wireless signal and transmit the wireless signal. The wireless communication receiving module is used to receive the wireless signal and demodulate and decode it into the transmission wavelength information.

[0037] Since the rotor is a rotating component, the pull rod is inside the rotor, and the cylinder surrounds the rotor and is a non-rotating component, this module can wirelessly transmit the transmission wavelength information obtained inside the rotating component to the outside, thereby solving the problem that the traditional stress monitoring method requires a wired connection between the inside and outside of the rotating component.

[0038] Module 4, stress analysis module: This module is used to compare the first relationship curve, the second relationship curve and the transmission wavelength information to obtain the stress condition of the pull rod.

[0039] Since the first curve reflects the relationship between transmission wavelength and temperature, and the second curve reflects the relationship between transmission wavelength and tension, the force applied to the tie rod can be determined by combining this information with the transmission wavelength. Furthermore, this module can display the force applied to the tie rod using charts (e.g., line charts and bar charts).

[0040] So far, completed Figure 1 Module description shown.

[0041] In an embodiment of the present application, an optical fiber containing several grating sensors is first installed in the center hole of a tie rod. The tie rod is then temperature-calibrated and tension-calibrated to determine the transmission wavelength-temperature relationship curves and the transmission wavelength-tension relationship curves of each grating sensor in the tie rod. A fiber demodulation module then receives the transmitted light from the optical fiber, demodulates it to obtain the transmission wavelength information of the grating sensor, and converts the transmission wavelength information into a wireless signal for external transmission via a wireless communication transmitter module installed on the rotor and wired to the fiber demodulation module. The wireless signal is then received by a wireless communication receiver module installed on the cylinder, converted into transmission wavelength information, and forwarded to the stress analysis module, which determines the stress condition of the tie rod based on the first and second relationship curves and the transmission wavelength information. This solves the problem of traditional stress monitoring methods requiring wired connections between the inside and outside of the combustion turbine rotor, resulting in complex installation and difficult maintenance.

[0042] In another embodiment, the above system further includes a wireless power transmission and reception module; The wireless power supply transmitting and receiving module includes a wireless power supply receiving module installed on the rotor and a wireless power supply transmitting module installed on the cylinder, wherein the wireless power supply transmitting module is used to convert electrical energy into electromagnetic waves and send them to the wireless power supply receiving module, and the wireless power supply receiving module is used to convert the electromagnetic waves into electrical energy.

[0043] This module realizes wireless power supply inside and outside the gas turbine rotor through a wireless power supply receiving module installed on the rotor and a wireless power supply transmitting module installed on the cylinder, solving the problem that traditional stress monitoring methods rely on battery power, which makes maintenance difficult.

[0044] Taking the gas turbine as an example, the light source, optical fiber demodulation module, wireless communication transmission module, and wireless power supply receiving module are installed on the rotor side of the gas turbine, and the wireless communication receiving module and wireless power supply transmission module are installed on the cylinder side of the gas turbine. Figure 2 As shown in the figure, the wireless communication transmitter module, wireless power receiving module, and wireless communication receiver module, wireless power transmitter module are located on the inner and outer sides of the rotating component, respectively. This overcomes the difficulties of wireless communication and wireless power supply between the rotating and static components of the tie rod mechanics monitoring, solves the problem of inability to monitor the gas turbine rotor tie rod online, and enables continuous monitoring of the gas turbine rotor tie rod during rotor operation.

[0045] like Figure 3 As shown, the present application also provides a gas turbine fault diagnosis device, which includes a bearing 1, a rotor 2, an optical fiber 3, a wheel disc 4, a nut 5, a pull rod 6, a rotor module 7, a cylinder module 8, and a host computer 9; The rotor 2 is mounted on the bearing 1 and supports the rotor in a cantilever manner. The rotor 2 is composed of a wheel disc 4, a tie rod 6, and a nut 5. The tie rod 6 passes through each wheel disc and is fastened at both ends by the nut 5 to tighten and fix the wheel discs together to form the rotor 2. An optical fiber 3 is installed in the center hole of the tie rod 6. Several grating sensors are prepared on the optical fiber 3. The grating period of each grating sensor is different, and their transmission wavelengths are spaced a distance apart from each other and do not interfere with each other, so as to accurately identify and locate a specific section of a tie rod. By performing temperature calibration on the tie rod at the location of the grating sensor, a first relationship curve between the transmission wavelength and temperature of each grating sensor is obtained. Then, by performing tension and stretch calibration on the tie rod, a second relationship curve between the transmission wavelength and tension of each grating sensor is obtained. The rotor module 7 includes a light source, an optical fiber demodulation unit, and a wireless communication transmitting unit, wherein the optical fiber demodulation unit and the wireless communication transmitting unit are connected by wire; the optical fiber demodulation unit is used to receive the transmitted light of the optical fiber, demodulate the transmitted light to obtain the transmission wavelength information of each grating sensor, and transmit the transmission wavelength information to the wireless communication transmitting unit by wire; the wireless communication transmitting unit is used to encode and modulate the transmission wavelength information into a wireless signal, and transmit the wireless signal outward; The cylinder module 8 includes a wireless communication receiving unit for receiving the wireless signal, demodulating and decoding it into the transmission wavelength information, and sending it to the host computer 9; The host computer 9 is used to compare the first relationship curve, the second relationship curve and the transmission wavelength information to obtain the force condition of the pull rod.

[0046] In another embodiment, the rotor module 7 further includes a wireless power receiving unit, and the cylinder module 8 further includes a wireless power transmitting unit; The wireless power supply transmitting unit is used to convert electrical energy into electromagnetic waves and send them to the wireless power supply receiving unit, and the wireless power supply receiving unit is used to convert the electromagnetic waves into electrical energy.

[0047] In another embodiment, the grating sensor is a Bragg grating sensor; If the number of the pull rods is greater than one, a portion of the length of the optical fiber in each pull rod is reserved at both ends of the pull rod, and the optical fibers in different pull rods are fused end to end in sequence to connect the optical fibers in the above pull rods in series to form a long optical fiber, and one end of the long optical fiber is connected to the light source, and the other end is connected to the optical fiber demodulation module.

[0048] In another embodiment, the step of performing segment-by-segment temperature calibration on the pull rod at the location of the grating sensor to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor includes: For any grating sensor, the pull rod section at the location of the grating sensor is placed in an eddy current solenoid, the current is adjusted, and when the temperature is determined to be stable at a preset calibration temperature, the transmission wavelength of the grating sensor is recorded; the above steps are performed for multiple calibration temperatures to obtain a first relationship curve between the transmission wavelength and the temperature; The step of performing tension calibration on the pull rod to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor includes: A dynamometer is installed at one end of the pull rod, a tension is applied to the pull rod at a preset temperature, and the transmission wavelength of each grating sensor on the pull rod is determined. The tension is repeatedly adjusted and the transmission wavelength of each grating sensor on the pull rod is determined to obtain a corresponding relationship curve between the transmission wavelength and the tension at the preset temperature; Adjust the preset temperature, repeat the steps of determining the transmission wavelength of each grating sensor, and repeat the steps of adjusting the tension and determining the transmission wavelength of each grating sensor, so as to obtain a corresponding relationship curve between the transmission wavelength and tension of each grating sensor at different temperatures, and determine it as the second relationship curve.

[0049] The above-mentioned embodiment of the present invention provides an online monitoring system for a gas turbine rotor rod, and based on this system, provides an online monitoring device for a gas turbine rotor rod. Through the above-mentioned system and device, the problem of traditional stress monitoring methods requiring wired connections and battery power supply inside and outside the rotating parts, resulting in complex installation and difficult maintenance, is solved.

[0050] This embodiment also discloses a computer device, which includes a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement any of the above-mentioned methods applied to the gas turbine rotor pull rod online monitoring system.

[0051] In addition, in the above-mentioned example implementation of the online monitoring device for the gas turbine rotor pull rod, the logical division of each program module is only an example. In actual application, the above-mentioned functions can be assigned to different program modules as needed, for example, for the convenience of corresponding hardware configuration requirements or software implementation. That is, the internal structure of the gas turbine rotor pull rod online monitoring device is divided into different program modules to complete all or part of the functions described above.

[0052] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A combustion turbine rotor tie rod online monitoring system, characterized in that: The system includes a pull rod calibration module, an optical fiber demodulation module, a wireless communication transmitting and receiving module and a stress analysis module; The pull rod calibration module includes a pull rod and an optical fiber installed in the center hole of the pull rod. A plurality of grating sensors are prepared on the optical fiber, and the grating period of each grating sensor is different. The pull rod at the location of the grating sensor is subjected to segment-by-segment temperature calibration to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor. The pull rod is then subjected to tension and stretching calibration to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor. The optical fiber demodulation module is used to receive the transmitted light of the optical fiber, demodulate the transmitted light to obtain the transmission wavelength information of each grating sensor, and transmit the transmission wavelength information to the wireless communication transmitting module of the wireless communication transmitting and receiving module via wired transmission; The wireless communication transmitting and receiving module includes a wireless communication transmitting module installed on the rotor and a wireless communication receiving module installed on the cylinder, wherein the wireless communication transmitting module is physically connected to the optical fiber demodulation module, and is used to encode and modulate the transmission wavelength information into a wireless signal and transmit the wireless signal outward; the wireless communication receiving module is used to receive the wireless signal and demodulate and decode it into the transmission wavelength information; The stress analysis module is used to compare the first relationship curve, the second relationship curve and the transmission wavelength information to obtain the stress condition of the pull rod.

2. The system according to claim 1, wherein: The system also includes a wireless power transmission and reception module; The wireless power supply transmitting and receiving module includes a wireless power supply receiving module installed on the rotor and a wireless power supply transmitting module installed on the cylinder, wherein the wireless power supply transmitting module is used to convert electrical energy into electromagnetic waves and send them to the wireless power supply receiving module, and the wireless power supply receiving module is used to convert the electromagnetic waves into electrical energy.

3. The system according to claim 1, wherein: The grating sensor is a Bragg grating sensor.

4. The system according to claim 1, wherein: The step of performing temperature calibration on the pull rod at the location of the grating sensor section by section to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor includes: For any grating sensor, place the pull rod section where the grating sensor is located in the eddy current solenoid, adjust the current, and when the temperature is determined to be stable at a preset calibration temperature, record the transmission wavelength of the grating sensor; The above steps are respectively performed for a plurality of calibration temperatures to obtain a first relationship curve between the transmission wavelength and the temperature.

5. The system according to claim 1, wherein: The step of performing tension calibration on the pull rod to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor includes: A dynamometer is installed at one end of the pull rod, a tension is applied to the pull rod at a preset temperature, and the transmission wavelength of each grating sensor on the pull rod is determined. The tension is repeatedly adjusted and the transmission wavelength of each grating sensor on the pull rod is determined to obtain a corresponding relationship curve between the transmission wavelength and the tension at the preset temperature; Adjust the preset temperature, repeat the steps of determining the transmission wavelength of each grating sensor, and repeat the steps of adjusting the tension and determining the transmission wavelength of each grating sensor, so as to obtain a corresponding relationship curve between the transmission wavelength and tension of each grating sensor at different temperatures, and determine it as the second relationship curve.

6. The system according to claim 1, wherein: If the number of the pull rods is greater than one, a portion of the length of the optical fiber in each pull rod is reserved at both ends of the pull rod, and the optical fibers in different pull rods are fused end to end in sequence to connect the optical fibers in the above pull rods in series to form a long optical fiber, and one end of the long optical fiber is connected to the light source, and the other end is connected to the optical fiber demodulation module.

7. A combustion turbine rotor tie rod online monitoring device, characterized in that: The device comprises a bearing (1), a rotor (2), an optical fiber (3), a wheel disc (4), a nut (5), a pull rod (6), a rotor module (7), a cylinder module (8), and a host computer (9); The bearing (1) is mounted on the rotor (2), an optical fiber (3) is mounted in the center hole of the pull rod (6), the pull rod (6) is mounted on the wheel disc (4) and fixed by a nut (5); a plurality of grating sensors are mounted on the optical fiber (3); the pull rod at the position of the grating sensor is subjected to segmented temperature calibration to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor; and the pull rod is subjected to tension and stretching calibration to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor; The rotor module (7) includes a light source, an optical fiber demodulation unit, and a wireless communication transmitting unit, wherein the optical fiber demodulation unit and the wireless communication transmitting unit are connected by wire; the optical fiber demodulation unit is used to receive the transmitted light of the optical fiber, demodulate the transmitted light to obtain the transmission wavelength information of each grating sensor, and transmit the transmission wavelength information to the wireless communication transmitting unit by wire; the wireless communication transmitting unit is used to encode and modulate the transmission wavelength information into a wireless signal, and transmit the wireless signal outward; The cylinder module (8) includes a wireless communication receiving unit for receiving the wireless signal, demodulating and decoding the wireless signal into the transmission wavelength information, and sending the information to the host computer (9); The host computer (9) is used to compare the first relationship curve, the second relationship curve and the transmission wavelength information to obtain the force condition of the pull rod.

8. The device according to claim 7, characterized in that The rotor module (7) further includes a wireless power receiving unit, and the cylinder module (8) further includes a wireless power transmitting unit; The wireless power supply transmitting unit is used to convert electrical energy into electromagnetic waves and send them to the wireless power supply receiving unit, and the wireless power supply receiving unit is used to convert the electromagnetic waves into electrical energy.

9. The device according to claim 7, characterized in that The grating sensor is a Bragg grating sensor; If the number of the pull rods is greater than one, a portion of the length of the optical fiber in each pull rod is reserved at both ends of the pull rod, and the optical fibers in different pull rods are fused end to end in sequence to connect the optical fibers in the above pull rods in series to form a long optical fiber, and one end of the long optical fiber is connected to the light source, and the other end is connected to the optical fiber demodulation module.

10. The device according to claim 7, characterized in that The step of performing temperature calibration on the pull rod at the location of the grating sensor section by section to obtain a first relationship curve between the transmission wavelength and temperature of each grating sensor includes: For any grating sensor, the pull rod section at the location of the grating sensor is placed in an eddy current solenoid, the current is adjusted, and when the temperature is determined to be stable at a preset calibration temperature, the transmission wavelength of the grating sensor is recorded; the above steps are performed for multiple calibration temperatures to obtain a first relationship curve between the transmission wavelength and the temperature; The step of performing tension calibration on the pull rod to obtain a second relationship curve between the transmission wavelength and tension of each grating sensor includes: A dynamometer is installed at one end of the pull rod, a tension is applied to the pull rod at a preset temperature, and the transmission wavelength of each grating sensor on the pull rod is determined. The tension is repeatedly adjusted and the transmission wavelength of each grating sensor on the pull rod is determined to obtain a corresponding relationship curve between the transmission wavelength and the tension at the preset temperature; Adjust the preset temperature, repeat the steps of determining the transmission wavelength of each grating sensor, and repeat the steps of adjusting the tension and determining the transmission wavelength of each grating sensor, so as to obtain a corresponding relationship curve between the transmission wavelength and tension of each grating sensor at different temperatures, and determine it as the second relationship curve.

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