Bulb tubular turbine generator damping winding broken bar fault monitoring device

Abstract

The utility model discloses a bulb tubular hydro-generator damping winding broken bar fault monitoring device, which relates to the technical field of generator rotor temperature monitoring and comprises a stator and a rotor, a plurality of ventilation ducts are arranged on the inner side wall of the stator, a plurality of spectrometers used for emitting ultraviolet light are arranged on the side walls of the ventilation ducts, and the spectrometers are arranged on the inner side wall of the stator. The damping bar is arranged on the outer side wall of the rotor, the magnetic pole iron core is arranged on the side of the damping bar, and a plurality of quantum dot nano coatings are arranged on the side, facing the stator, of the magnetic pole iron core; the problems that an infrared temperature measurement mode adopted by an existing bulb tubular turbine generator damping winding broken bar fault detection device is large in limitation, errors are increased, and even temperature measurement fails are solved.

Description

Technical Field

[0001] This utility model relates to the field of generator rotor temperature monitoring technology, specifically to a lamp-type through-flow hydro generator damping winding broken bar fault monitoring device. Background Technology

[0002] In recent years, with the continuous increase in the capacity of axial-flow turbine generators, the electromagnetic and thermal loads on the damping windings have also increased significantly. Damping bar breakage faults have repeatedly occurred in such units both domestically and internationally. The broken damping bar is usually the one closest to the leeward side, and the area near the broken bar often exhibits obvious overheating characteristics. Therefore, monitoring the gas temperature near the damping bar close to the leeward side can help in the monitoring and early warning of such faults.

[0003] The invention patent with publication number CN107764404A, entitled "Online Monitoring Method for Broken Bar Faults in Damping Winding of a Bulb-type Axial-flow Hydrogen Generator," describes the use of infrared thermography to monitor the temperature changes at the fault point of the broken bar in the damping winding of a bulb-type axial-flow hydrogen generator. However, due to the influence of the working environment of the bulb-type axial-flow hydrogen generator, the ambient light may be unstable due to generator vibration and mechanical movement, which may cause delays and affect the real-time monitoring effect. At the same time, there is a lot of water vapor and dust in the air, which greatly interferes with the infrared thermography equipment, and may even reflect or refract infrared rays, leading to increased temperature measurement errors or even failure. Utility Model Content

[0004] This invention provides a fault monitoring device for broken bars in the damping winding of a bulb-type hydro-generator, which solves the problem that the existing infrared temperature measurement method used in the fault detection device for broken bars in the damping winding of a bulb-type hydro-generator has great limitations, leading to increased errors or even temperature measurement failure.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] A lamp-type through-flow hydro generator damping winding broken bar fault monitoring device includes a stator and a rotor. The inner sidewall of the stator has several ventilation grooves, and several spectrometers for emitting ultraviolet light are installed on the sidewalls of the ventilation grooves. It also includes a damping bar disposed on the outer sidewall of the rotor and a magnetic pole core disposed on the side of the damping bar. The magnetic pole core has several quantum dot nano-coatings on one side facing the stator.

[0007] This invention utilizes the optical properties of quantum dot nanosensors to make them shift in a predictable manner with temperature changes. Then, ultraviolet light emitted by a spectrometer excites the quantum dot nanocoating to generate a fluorescence signal. By capturing the fluorescence signal with a spectrometer, the temperature change near the magnetic pole core can be obtained, thereby determining whether a broken bar fault has occurred in the damping winding near the magnetic pole core.

[0008] In terms of environmental adaptability, existing infrared temperature measurement technology is limited by environmental conditions, leading to a decrease in measurement accuracy. For example, unstable light in the environment caused by vibration and mechanical movement may cause delays, affecting the real-time monitoring effect. Furthermore, the lens is susceptible to high temperature or gas corrosion, resulting in a decrease in accuracy and requiring frequent maintenance. In contrast, the quantum dot nanocoating material has excellent corrosion resistance and can work stably for a long time in extreme environments (such as high or low temperatures), greatly reducing labor costs. It is also a non-contact coating that does not require line of sight. The fluorescence characteristics of the quantum dot nanocoating change with temperature, providing higher sensitivity and spatial resolution. It also performs well under weak signals and exhibits strong noise resistance. Even in high temperature or vibration environments, it can provide fast and accurate temperature measurement. The light amplification effect of the quantum dot nanocoating significantly improves the intensity of the temperature measurement signal, especially in low light environments.

[0009] The quantum dot structure of the quantum dot nanocoating has high thermal stability and resistance to radiation damage, enabling it to operate normally in high-temperature and radiation environments. This characteristic makes it more suitable for use in industrial equipment that operates for long periods of time, such as generator damping strips.

[0010] Furthermore, it also includes several acoustic positioning devices installed on the sidewalls of the ventilation ditch.

[0011] By emitting ultrasonic waves of a specific frequency through an acoustic positioning device, the speed of sound changes when passing through a gas and temperature field. Using relevant formulas and the time difference between the emission and reception of the ultrasonic waves, a gas temperature field can be constructed. By comparing this gas temperature field with that under normal conditions, it can be determined whether a broken bar fault has occurred in the damping winding. At the same time, it can also reduce or calibrate the local errors caused by the quantum dot nanocoating to a certain extent.

[0012] Because existing infrared thermometry technology has low spatial resolution, the measurement results may be affected by local errors. This invention uses time difference of arrival (TOA) technology based on acoustic signals to quickly determine the rotor's rotation position and temperature field distribution. By reducing or calibrating local errors, the accuracy and reliability of the measurement are improved.

[0013] Meanwhile, based on the time when the acoustic signal receiver of the acoustic positioning device receives the signal, the current rotation position and rotation distance of the rotor can be determined, thereby determining whether the temperature monitoring area has rotated to the area below the spectrometer. This allows the temperature of the damping strip to be monitored only during the time period when the temperature monitoring area rotates to the range covered by ultraviolet light, making the temperature measurement data more targeted and reducing the workload of analyzing the temperature measurement results.

[0014] In addition, the spectrometer and quantum dot nanocoating monitor the temperature changes near the damping strip, and the acoustic positioning device calibrates it, which can solve the problem of environmental interference. Furthermore, by combining acoustic sampling with quantum dot fluorescence transient analysis, the local temperature near the quantum dot nanocoating is matched with the global temperature field of the acoustic wave, which can greatly reduce measurement errors and improve the accuracy of the device.

[0015] Compared to existing infrared temperature measurement methods, quantum dot coated sensors offer superior corrosion resistance and their sound waves are unaffected by light or other factors, allowing them to penetrate smoke and dust, making them suitable for extreme environments with low or high temperatures. Furthermore, the quantum dot coating in these sensors is passively luminescent, with sound energy provided by a centralized acoustic positioning device. This eliminates the need for a power supply to the terminal, significantly reducing power consumption and maintenance costs, thus lowering overall costs. This results in a longer lifespan, greater mechanical flexibility, and excellent long-term stability, enabling continuous real-time monitoring and feedback of the damping strip's temperature. It also exhibits good environmental adaptability. Moreover, the dual physical mechanisms of optical and acoustic verification enhance its reliability compared to single-sensor technologies. The biodegradable quantum dot materials reduce electronic waste, making it sufficiently green and low-carbon, demonstrating superior technological advancement and engineering applicability.

[0016] Furthermore, several of the aforementioned acoustic positioning devices are uniformly distributed around the central axis of the rotor. This allows for precise acquisition of changes in the optical properties of the quantum dot nanocoating, thereby measuring the gas temperature within the motor's ventilation channels and subsequently monitoring the damping strips.

[0017] Furthermore, it also includes a magnetic field shielding shell installed outside the device. This effectively suppresses the influence of the magnetic field and avoids device failure caused by excessively high surface temperatures of the motor core. Since the spectrometer and related components of the acoustic positioning device are located in the ventilation trench, the spectrometer and signal acquisition equipment will not fail due to severe high temperatures.

[0018] Furthermore, several of the aforementioned spectrometers are evenly distributed around the central axis of the rotor. This allows for timely monitoring of any faulty damping windings.

[0019] Furthermore, the quantum dot nanocoating is uniformly distributed on the surface of the magnetic pole core.

[0020] Furthermore, it also includes a signal amplifier that is connected to the spectrometer and the acoustic positioning device.

[0021] Furthermore, it also includes a control center that is connected to the signal amplifier.

[0022] Furthermore, it also includes a power module installed on the stator. This module can provide continuous power supply effectively and, when changes in the optical properties of the quantum dot nanocoating are detected, can issue real-time alerts, optimize system operation, reduce unnecessary maintenance costs and expenses, and monitor the equipment's operating status, condition, and load in real time. It has high applicability and scalability, can significantly save experimental costs, and improve data acquisition accuracy.

[0023] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0024] (1) This utility model utilizes the optical properties of quantum dot nanosensors to make them shift in a predictable manner with temperature changes. Then, the quantum dot nanocoating is excited by ultraviolet light irradiated by a spectrometer to generate a fluorescence signal. The fluorescence signal is captured by the spectrometer to obtain the temperature change near the magnetic pole core, thereby determining whether the damping winding near the magnetic pole core has a broken bar fault.

[0025] (2) Quantum dot nanocoatings are made by quantum dot coating materials. They have good corrosion resistance and can work stably for a long time in extreme environments (such as high temperature or low temperature). They can greatly reduce labor costs and are non-contact coverage, which does not require line of sight. The fluorescence characteristics of quantum dot nanocoatings change with temperature, which can provide higher sensitivity and spatial resolution. They also perform well under weak signals and have strong anti-noise ability. The light amplification effect of quantum dot nanocoatings significantly improves the intensity of temperature measurement signals.

[0026] (3) By emitting ultrasonic waves of a specific frequency through the acoustic positioning device, the speed of sound changes when passing through the gas and temperature field. By using relevant formulas and the time difference between the emission and reception of ultrasonic waves, the gas temperature field can be constructed. By comparing it with the gas temperature field under normal conditions, it can be determined whether the damping winding has a broken bar fault. At the same time, it can also reduce or calibrate the local error caused by the quantum dot nanocoating to a certain extent.

[0027] (4) The quantum dot coating of the quantum dot coated sensor is passively luminescent, and the acoustic energy is provided by a centralized acoustic positioning device. The terminal does not require power supply, which can greatly reduce power consumption and maintenance costs, and significantly reduce the overall cost. This results in a better service life and mechanical flexibility, good long-term stability, and the ability to monitor and provide feedback on the temperature of the damping strip in real time for a long time and continuously. It also has good environmental adaptability. Furthermore, the optical and acoustic dual physical mechanisms verify each other, and its reliability surpasses that of single sensing technology. It can also biodegrade quantum dot materials to reduce electronic waste, making it green and low-carbon, with better technological advancement and engineering applicability.

[0028] (5) By monitoring the temperature change near the damping strip with a spectrometer and quantum dot nanocoating, and calibrating it with an acoustic positioning device, the problem of environmental interference can be solved. Furthermore, by combining acoustic sampling with quantum dot fluorescence transient analysis, the local temperature near the quantum dot nanocoating can be matched with the global temperature field of the acoustic wave, which can greatly reduce measurement errors and improve the accuracy of the device. Attached Figure Description

[0029] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0030] Figure 1 This is a partial sectional view of the generator stator and rotor in this utility model;

[0031] Figure 2 This is a schematic diagram of the damping bar structure in this utility model;

[0032] Among them, 1-stator, 2-rotor, 3-ventilation groove, 4-spectrometer, 5-damping strip, 6-magnetic pole core, 7-quantum dot nano-coating, 8-sonic positioning device. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0035] Example

[0036] This embodiment provides a lamp-type axial-flow hydro generator damping winding broken bar fault monitoring device, such as... Figure 1 and Figure 2 As shown, it includes a stator 1 and a rotor 2. The inner sidewall of the stator 1 is provided with a plurality of ventilation grooves 3. A plurality of spectrometers 4 for emitting ultraviolet light are installed on the sidewall of the ventilation grooves 3. It also includes a damping strip 5 disposed on the outer sidewall of the rotor 2 and a magnetic pole core 6 disposed on the side of the damping strip 5. The magnetic pole core 6 is provided with a plurality of quantum dot nano-coatings 7 on one side facing the stator 1.

[0037] The number of spectrometers 4 is determined according to the requirements. Preferably, their monitoring range can achieve 360° all-round monitoring around the rotor 2. Their detection end is installed facing the side of the rotor 2. The spectrometers 4 are preferably miniature spectrometers, which are easy to install in the relatively narrow ventilation groove 3. The quantum dot nano-coating 7 is made by printing nano-dot coating, which can be lead sulfide quantum dots.

[0038] The quantum dot nanocoating 7 in this embodiment can be implemented using mature existing technologies.

[0039] In a more preferred embodiment, a plurality of acoustic positioning devices 8 are also included, which are installed on the sidewalls of the ventilation ditch 3.

[0040] The number of acoustic positioning devices 8 is preferably equal to the number of spectrometers 4. Miniature acoustic positioning devices 8 are also used to facilitate installation in relatively narrow ventilation trenches 3. The ultrasonic frequency emitted by the device is preferably 20-100kHz. The acoustic positioning device 8 includes a transmitting end and a receiving end. The transmitting end is located on the side wall of the ventilation trench 3, and the receiving end is preferably installed on the damping strip 5 on the rotor. When generating the temperature model, edge computing combined with a lightweight AI model can be used.

[0041] Preferably, an edge processing unit is integrated inside the spectrometer 4, which can realize real-time monitoring, automatic filtering of abnormal data, scanning periodic data, automatic identification of sensor failure areas, dynamic adjustment of acoustic wave path to achieve redundant coverage, and encapsulation and transmission of parameters such as temperature.

[0042] In a more preferred embodiment, several of the acoustic positioning devices 8 are evenly distributed around the central axis of the rotor 2.

[0043] In a more preferred embodiment, a magnetic field shielding enclosure is also included, mounted externally to the device. The device wiring is also preferably shielded.

[0044] In a more preferred embodiment, several spectrometers 4 are evenly distributed around the central axis of the rotor 2.

[0045] In a more preferred embodiment, the quantum dot nanocoating 7 is uniformly distributed on the surface of the magnetic pole core 6. A rectangular array distribution is preferred.

[0046] In a more preferred embodiment, a signal amplifier is also included that is signal-connected to the spectrometer 4 and the acoustic positioning device 8.

[0047] In a more preferred embodiment, a control center connected to the signal amplifier is also included. The control center can employ any existing mature technology, such as a microcontroller, server system, PLC, or single-chip microcomputer.

[0048] In a more preferred embodiment, a power module mounted on the stator 1 is also included.

[0049] The data collected by the spectrometer 4 and the acoustic positioning device 8 are converted into digital signals by an analog-to-digital converter (ADC) through a signal amplifier for signal transmission. Preferably, wireless signals are used to encapsulate and transmit the data. After arriving at the control center, the data is collected, reassembled, and stored to obtain real-time gas temperature data and operating status. The control center can be a microcontroller or a server system.

[0050] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0051] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A damping winding broken bar fault monitoring device for a bulb-through hydro generator, comprising a stator (1) and a rotor (2), characterized in that, The inner wall of the stator (1) is provided with a plurality of ventilation grooves (3), the side wall of the ventilation groove (3) is provided with a plurality of spectrometers (4) for emitting ultraviolet light, further comprising a damping strip (5) arranged on the outer side wall of the rotor (2) and a magnetic pole core (6) arranged on the side of the damping strip (5), the magnetic pole core (6) is provided with a plurality of quantum dot nano coating (7) on the side of the stator (1).

2. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 1, characterized in that, Further comprising a plurality of sound wave positioning devices (8) mounted on the side wall of the ventilation groove (3).

3. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 2, characterized in that, A plurality of sound wave positioning devices (8) are uniformly distributed around the central axis of the rotor (2).

4. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 1, characterized in that, Further comprising a magnetic field shielding shell mounted outside the device.

5. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 1, characterized in that, A plurality of the spectrometer (4) is uniformly distributed around the central axis of the rotor (2).

6. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 1, characterized in that, The quantum dot nano coating (7) is uniformly distributed on the surface of the magnetic pole core (6).

7. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 2, characterized in that, Further comprising a signal amplifier connected with the signal of the spectrometer (4) and the sound wave positioning device (8).

8. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 7, characterized in that, Further comprising a control center connected with the signal of the signal amplifier.

9. A lamp bulb through-flow type hydro-generator damping winding broken-bar fault monitoring device according to claim 1, characterized in that, Further comprising a power module mounted on the stator (1).

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