Self-checking humidity detection device, system and slip ring chamber humidity detection method

Abstract

The present invention provides a self-checking humidity detection device, system and slip ring chamber humidity detection method, which belongs to the field of humidity detection technology. The device includes: a first pipeline, a second pipeline, a first signal generator, a first signal receiver, a second signal generator, a second signal receiver, a signal processor and a power supply; the first signal generator and the first signal receiver are arranged in the first pipeline, and are relatively arranged at the two ends of the first pipeline, and the first pipeline is provided with an opening; the second signal generator and the second signal receiver are arranged in the second pipeline, and are relatively arranged at the two ends of the second pipeline, and the second pipeline is sealed inside; the first signal generator and the second signal generator are respectively connected to the power supply, and the first signal receiver and the second signal receiver are respectively connected to the signal processor. The present invention can effectively detect the air humidity of the slip ring chamber, and can perform self-checking without taking out the humidity detector, effectively reducing the operating cost.

Description

Technical Field

[0001] The present invention relates to the technical field of humidity detection, and in particular to a self-checking humidity detection device, a self-checking humidity detection system and a slip ring chamber humidity detection method. Background Art

[0002] The generator of a doubly-fed wind turbine generator set has a slip ring and a matching brush device. The slip ring consists of three electrodes that are connected to the three phases of the generator respectively. The brushes are in contact with the three phases of the slip ring respectively to collect the current generated by the generator during operation. The slip ring and the matching brush device are generally surrounded by the slip ring chamber of the generator. The brush is made of conductive materials such as carbon powder. The brush is in contact with the surface of the slip ring. The brush is fixed relative to the slip ring. When the slip ring rotates, the brush rubs against the surface of the slip ring. This friction will gradually wear away the conductive materials such as carbon powder on the brush surface, and the worn-away material becomes powder.

[0003] In humid air conditions, powder that falls off the brush will combine with humid water vapor to form a paste-like substance, which is easy to accumulate between the brush and the brush holder. As the amount of paste-like substance at this position increases, it will agglomerate. The agglomeration between the brush holder and the brush will cause the brush to get stuck. The brush is originally pushed toward the surface of the slip ring by the spring, so that the brush will still stick to the slip ring after being worn shorter, but the sticking phenomenon will cause the brush to no longer be pushed toward the slip ring smoothly. At this time, there is a gap between the slip ring and the brush surface. Due to the existence of the gap, an arc will be generated between the slip ring and the brush every time the generator generates electricity. The high temperature caused by the arc will burn the surface of the slip ring, and may cause the brush and the wires connected to the brush to carbonize due to the high temperature, thereby damaging the slip ring and the brush system.

[0004] In order to avoid the above phenomenon, it is necessary to add a humidity sensor to the slip ring chamber. Conventional humidity sensors need to be recalibrated and tested regularly to confirm the accuracy of the sensor in measuring humidity. The calibration work requires the humidity sensor to be removed from the generator slip ring chamber and taken to a special testing laboratory for inspection. The sensor can only be used after it is tested to be qualified. This will delay the power generation operation of the wind turbine and increase operating costs. Summary of the invention

[0005] The purpose of the present invention is to provide a self-checking humidity detection device, system and slip ring chamber humidity detection method to solve the technical problem in the prior art that humidity sensors need to be taken out for inspection regularly.

[0006] In order to achieve the above object, in a first aspect of the present invention, a self-checking humidity detection device is provided, which is used to detect the humidity in a slip ring chamber, comprising:

[0007] A first pipeline, a second pipeline, a first signal generator, a first signal receiver, a second signal generator, a second signal receiver, a signal processor and a power supply;

[0008] The first signal generator and the first signal receiver are arranged in the first pipe and are arranged at two ends of the first pipe opposite to each other. The first pipe is provided with an opening so that the air in the first pipe is connected with the air in the slip ring chamber.

[0009] The second signal generator and the second signal receiver are arranged in the second pipe and are arranged at two ends of the second pipe opposite to each other, and the interior of the second pipe is sealed;

[0010] The first signal generator and the second signal generator are connected to the power supply respectively, and the first signal receiver and the second signal receiver are connected to the signal processor respectively.

[0011] Optionally, the first signal generator and the second signal generator are laser transmitters, the first signal receiver and the second signal receiver are laser receivers, and the signal processor is an image processor;

[0012] The first signal generator and the second signal generator are used to generate laser signals, the first signal receiver is used to receive the laser signal generated by the first signal generator and send the received laser signal to the image processor, and the second signal receiver is used to receive the laser signal generated by the second signal generator and send the received laser signal to the image processor;

[0013] The image processor is used to process the received laser signal to convert the received laser signal into a corresponding humidity value.

[0014] A second aspect of the present invention provides a humidity detection system for a self-checking slip ring chamber, comprising:

[0015] The above-mentioned self-checking humidity detection device;

[0016] A main controller; and a heating device disposed in the slip ring chamber;

[0017] The main controller is connected to the self-checking humidity detection device and the heating device respectively;

[0018] The self-checking humidity detection device is used to detect the humidity value in the slip ring chamber, and the main controller is used to control the heating device to heat when the humidity value in the slip ring chamber is greater than the humidity threshold until the humidity value in the slip ring chamber is no greater than the humidity threshold.

[0019] A third aspect of the present invention provides a slip ring chamber humidity detection method, which is applied to the above-mentioned self-checking humidity detection device, and the method comprises:

[0020] emitting a laser signal through the first signal generator;

[0021] receiving the laser signal emitted by the first signal generator through the first signal receiver and sending the received laser signal to the image processor;

[0022] The received laser signal is processed by the image processor to obtain a corresponding spectrum, the obtained spectrum is matched with a pre-calibrated reference spectrum, and the humidity value in the slip ring chamber is determined according to the matching result. The reference spectrum at least includes light wave frequency bands and light wave amplitudes corresponding to different humidity values.

[0023] Optionally, the calibration method of the reference spectrum includes:

[0024] performing a drying process on the first pipe and the second pipe;

[0025] placing the first pipe in an environment with a humidity of a first humidity value, emitting a laser signal through the first signal generator, sending the laser signal emitted by the first signal generator to the image processor through the first signal receiver, and processing the received laser signal through the image processor to obtain a first spectrum; and

[0026] The second signal generator emits a laser signal, the second signal receiver sends the laser signal emitted by the second signal generator to the image processor, and the image processor processes the received laser signal to obtain a second spectrum;

[0027] Matching the first spectrum with the second spectrum, marking the frequency band in the first spectrum that does not belong to the second spectrum as the light wave frequency band of water vapor scattered light waves, obtaining the first light wave amplitude of the light wave frequency band of the water vapor scattered light waves in the current environment, and calibrating the humidity value corresponding to the first light wave amplitude as the first humidity value;

[0028] placing the first pipe in an environment with a second humidity value, obtaining a second light wave amplitude of a light wave frequency band of the water vapor scattered light wave in the current environment, calibrating a humidity value corresponding to the second light wave amplitude as the second humidity value, wherein the second humidity value is greater than the first humidity value;

[0029] The above process is repeated until the humidity values ​​corresponding to the different light wave amplitudes in the light wave frequency band of the water vapor scattered light wave are calibrated to obtain a calibrated reference spectrum.

[0030] Optionally, matching the obtained spectrum with a pre-calibrated reference spectrum, and determining the humidity value in the slip ring chamber according to the matching result, includes:

[0031] Determining a target light wave frequency band according to the obtained spectrum, wherein the target light wave frequency band is a light wave frequency band belonging to the light wave frequency band of the water vapor scattered light wave in the obtained spectrum;

[0032] A target light wave amplitude in the target light wave frequency band is obtained, and a humidity value corresponding to a light wave amplitude in the reference spectrum that matches the target light wave amplitude is used as a humidity value in the slip ring chamber.

[0033] Optionally, the method further comprises:

[0034] When the interior of the second pipe is in an unsealed state, emitting laser signals through the first signal generator and the second signal generator;

[0035] The laser signal sent by the first signal generator is sent to the image processor through the first signal receiver, and the received laser signal is processed by the image processor to obtain a third spectrum; the laser signal sent by the second signal generator is sent to the image processor through the second signal receiver, and the received laser signal is processed by the image processor to obtain a fourth spectrum;

[0036] The third spectrum is matched with the fourth spectrum to obtain a verification result.

[0037] Optionally, matching the third spectrum with the fourth spectrum to obtain a verification result includes:

[0038] Matching the third spectrum with a pre-calibrated reference spectrum, and determining a humidity value corresponding to the third spectrum according to the matching result; and matching the fourth spectrum with a pre-calibrated reference spectrum, and determining a humidity value corresponding to the fourth spectrum according to the matching result;

[0039] In the case where the humidity value corresponding to the third spectrum matches the humidity value corresponding to the fourth spectrum, determining that the self-checking humidity detection device is in a normal state;

[0040] In the case that the humidity value corresponding to the third spectrum does not match the humidity value corresponding to the fourth spectrum, it is determined that the self-checking humidity detection device is in an abnormal state.

[0041] Optionally, the method further comprises:

[0042] It is determined that the self-checking humidity detection device has a self-checking function.

[0043] Optionally, determining that the self-checking humidity detection device has a self-checking function includes:

[0044] The second signal generator emits a laser signal, the second signal receiver sends the laser signal emitted by the second signal generator to the image processor, and the image processor processes the received laser signal to obtain a fifth spectrum;

[0045] The fifth spectrum is matched with the reference spectrum, and when there is no light wave frequency band in the fifth spectrum that matches the light wave frequency band of the water vapor scattered light wave, it is determined that the self-checking humidity detection device has a self-checking function.

[0046] The present invention can effectively detect the air humidity in the slip ring chamber, and can perform self-calibration without taking out the humidity detector, and can effectively reduce the operation cost without affecting the power generation operation of the wind turbine generator set.

[0047] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0049] Figure 1 It is a structural schematic diagram of a self-checking humidity detection device provided by a preferred embodiment of the present invention;

[0050] Figure 2 It is a structural schematic diagram of a self-checking humidity detection system provided by a preferred embodiment of the present invention;

[0051] Figure 3 The present invention provides a flow chart of a method for detecting humidity in a slip ring chamber according to a preferred embodiment of the present invention.

[0052] Description of Reference Numerals

[0053] 11 - first pipeline, 12 - second pipeline, 21 - first signal generator, 22 - first signal receiver, 23 - second signal generator, 24 - second signal receiver, 30 - signal processor, 40 - power supply, 50 - opening. DETAILED DESCRIPTION

[0054] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0055] The slip ring and three sets of brush devices are arranged in the slip ring chamber of the generator of the existing doubly fed wind turbine generator set. The slip ring has three electrodes, and the three electrodes of the slip ring are respectively connected to the three-phase winding inside the generator. The three sets of brushes are respectively in contact with the three-phase electrodes of the slip ring to collect the current generated by the generator when it is running. Among them, the brush is fixed in the slip ring chamber, and the slip ring can rotate. In this way, when the slip ring rotates, the brush rubs against the surface of the slip ring, and the friction causes the conductive materials such as carbon powder on the brush surface to be gradually worn away, and the worn away materials form conductive powder.

[0056] When the wind turbine is running in a dry environment, the powder that is ground off is more likely to fall into the powder collection box. When the wind turbine is running in a humid environment, the powder that falls off the brush will combine with the humid water vapor to form a paste-like substance. The paste-like substance is easy to accumulate between the brush and the brush holder, and the paste-like substance will agglomerate as it increases, causing the brush to get stuck. When the generator is operating normally, the brush is pushed to the surface of the slip ring by the spring, so that the brush will still be close to the slip ring after being worn short, but the sticking phenomenon caused by the agglomeration of the paste-like substance will make the brush no longer be pushed to the slip ring. At this time, there is a gap between the slip ring and the brush surface. Due to the existence of the gap, every time the generator generates electricity, an arc will be generated between the slip ring and the brush. The high temperature caused by the arc will burn the surface of the slip ring, and may cause the brush and the wires connected to the brush to be carbonized due to the high temperature, thereby damaging the slip ring and the brush system.

[0057] At present, a heater is usually placed in the slip ring chamber of the generator, and the heat provided by the heater is used to dry the slip ring chamber to avoid jamming. However, the existing heater usually determines the start and stop of heating based on the time interval, and the heater power consumption is high, so the open-loop heating system will waste a lot of electricity. In order to avoid the above phenomenon, it is necessary to add a humidity sensor to the slip ring chamber. The detector can convert the humidity information in the slip ring into a switch signal or a digital signal with a certain resolution and transmit it to the fan main control system. After the main control system obtains the humidity information, it decides whether to heat and dry the slip ring according to the test results, so as to achieve the purpose of precise control of drying and save electricity.

[0058] In order to solve the above problems, Figure 1 As shown, the first aspect of this embodiment provides a self-checking humidity detection device for detecting the humidity in a slip ring chamber, comprising:

[0059] A first pipeline 11, a second pipeline 12, a first signal generator 21, a first signal receiver 22, a second signal generator 23, a second signal receiver 24, a signal processor 30 and a power supply 40; the first signal generator 21 and the first signal receiver 22 are arranged in the first pipeline 11, and are arranged at two ends of the first pipeline 11 opposite to each other, and an opening 50 is arranged on the first pipeline 11 so that the air in the first pipeline 11 is connected with the air in the slip ring chamber; the second signal generator 23 and the second signal receiver 24 are arranged in the second pipeline 12, and are arranged at two ends of the second pipeline 12 opposite to each other, and the interior of the second pipeline 12 is sealed; the first signal generator 21 and the second signal generator 23 are respectively connected to the power supply 40, and the first signal receiver 22 and the second signal receiver 24 are respectively connected to the signal processor 30.

[0060] Among them, the first signal generator 21 and the second signal generator 23 are laser transmitters, the first signal receiver 22 and the second signal receiver 24 are laser receivers, and the signal processor 30 is an image processor; the first signal generator 21 and the second signal generator 23 are used to generate laser signals, the first signal receiver 22 is used to receive the laser signal generated by the first signal generator 21 and send the received laser signal to the image processor, and the second signal receiver 24 is used to receive the laser signal generated by the second signal generator 23 and send the received laser signal to the image processor; the image processor is used to process the received laser signal to convert the received laser signal into a corresponding humidity value.

[0061] In this embodiment, the laser transmitter is an infrared laser transmitter, and the first pipe 11 and the second pipe 12 are metal pipes. It can be understood that the two ends of the first pipe 11 and the second pipe 12 can be sealed by a detachable sealing component so that the inside of the first pipe 11 and the second pipe 12 is in a sealed state. The laser transmitter and the laser receiver are respectively installed on the sealing components at both ends of the first pipe 11 and the second pipe 12, and are inside the first pipe 11 and the second pipe 12. Specifically, a laser transmitter is installed at one end of the first pipe 11, and a corresponding laser receiver is installed at the other end of the first pipe 11 at a position opposite to the laser transmitter to capture the laser signal emitted by the laser transmitter; similarly, a laser transmitter is installed at one end of the second pipe 12, and a corresponding laser receiver is installed at the other end of the first pipe 11 at a position opposite to the laser transmitter to capture the laser signal emitted by the laser transmitter.

[0062] An opening 50 is provided on the pipe wall of the first pipe 11, so that the first pipe 11 can be connected to the external air, so that the air humidity in the first pipe 11 can be regarded as the air humidity in the external environment; the second pipe 12 is completely sealed, and is filled with dried air or air with low humidity, so as to compare the spectra of the laser signals received by the two laser receivers in the first pipe 11 and the second pipe 12.

[0063] When in use, the first pipe 11 and the second pipe 12 can be bound together and installed in the slip ring chamber. The input power 40 of the two laser transmitters is set separately using the same power line 40 to ensure that when the power 40 fluctuates, the output light sources of the two laser transmitters fluctuate similarly.

[0064] The laser receiver inputs the received laser signal into the image processor, and the image processor performs spectral analysis on the received laser signal to determine the air humidity in the first pipe 11. According to the Raman scattering principle, water vapor is scattered by light and generates light with a wavelength different from the emitted laser frequency, and other substances such as tiny dust can also produce Raman scattering. When in use, the image processor performs Fourier transform on the graphic waveform of the laser signal received in the first pipe 11, converts the spectrum into the frequency domain, intercepts the frequency band with a wavelength close to the Raman scattering characteristics of water vapor, or intercepts the frequency that is not found in the second pipe 12, or the frequency in the second pipe 12 that is the same as that in the first pipe 11, but with a significantly smaller amplitude. These frequencies are called water vapor characteristic frequencies. At this time, the amplitude of the water vapor characteristic frequency in the first pipe 11 is observed, and it is matched with the pre-calibrated mapping relationship of water vapor characteristic frequency, amplitude and humidity value to determine the relative humidity of the air in the first pipe 11, that is, the humidity of the slip ring chamber. At the same time, the amplitude of the above frequency band in the first pipe 11 is compared with the amplitude of the frequency band in the second pipe 12, so as to verify whether the laser system can work normally. For example, the second pipe 12 is sealed at ordinary times. When the unit stops working, the humidity in the slip ring room can be reduced by drying equipment. When the first pipe 11 detects that the humidity in the slip ring room is less than 40%, when self-check is required, the sealing component of the second pipe 12 can be opened to make the second pipe 12 and the slip ring room the same. At this time, the humidity of the first pipe 11 and the second pipe 12 is measured. If the humidity measurement values ​​of the two are close, it can be judged that the humidity measurement instrument of the first pipe 11 is effective.

[0065] like Figure 2 As shown, the second aspect of the present invention provides a humidity detection system for a self-checking slip ring chamber, comprising:

[0066] The above-mentioned self-checking humidity detection device; the main controller and the heating device arranged in the slip ring chamber; the main controller is connected with the self-checking humidity detection device and the heating device respectively; the self-checking humidity detection device is used to detect the humidity value in the slip ring chamber, and the main controller is used to control the heating device to heat when the humidity value in the slip ring chamber is greater than the humidity threshold value, until the humidity value in the slip ring chamber is not greater than the humidity threshold value. For example, when the humidity value is detected to reach 60%, it is considered that the air humidity in the slip ring chamber reaches the warning value, the image processor sends an alarm signal to the fan main controller, and the main controller controls the heating device to heat the slip ring chamber, thereby achieving the purpose of precise control of drying and saving electric energy at the same time.

[0067] like Figure 3 As shown, the third aspect of the present invention provides a slip ring chamber humidity detection method, which is applied to the above-mentioned self-checking humidity detection device, and the method includes:

[0068] emitting a laser signal through a first signal generator;

[0069] receiving the laser signal emitted by the first signal generator through the first signal receiver and sending the received laser signal to the image processor;

[0070] The received laser signal is processed by an image processor to obtain a corresponding spectrum, and the obtained spectrum is matched with a pre-calibrated reference spectrum. The humidity value in the slip ring chamber is determined according to the matching result. The reference spectrum at least includes light wave frequency bands and light wave amplitudes corresponding to different humidity values.

[0071] In this embodiment, the self-checking humidity detection device can detect the humidity in the slip ring chamber at set time intervals, or can start detecting the humidity in the slip ring chamber in response to a control instruction, which is not limited here.

[0072] In order to accurately detect the ambient humidity, before detecting the ambient humidity, it is necessary to calibrate the mapping relationship between the light wave frequency band, amplitude and humidity of the water vapor scattered light wave in advance. The calibration method of the reference spectrum of this embodiment includes:

[0073] S100, drying the first pipe and the second pipe to ensure that there are no impurities and water vapor in the pipes. Connecting the laser transmitter and the laser receiver of the first pipe and the second pipe respectively, checking the spectrum of the receiving end of the first pipe and the second pipe through the image processor, slicing the spectrum, calibrating the frequency within a certain range, and then calibrating several such frequency ranges, comparing the spectrum diagrams of the two receiving ends until the optical frequency range and amplitude of the first pipe and the second pipe are close.

[0074] S200, placing the first pipe in an environment with a first humidity value, emitting a laser signal through a first signal generator, sending the laser signal emitted by the first signal generator to an image processor through a first signal receiver, and processing the received laser signal through the image processor to obtain a first spectrum; and emitting a laser signal through a second signal generator, sending the laser signal emitted by the second signal generator to the image processor through a second signal receiver, and processing the received laser signal through the image processor to obtain a second spectrum.

[0075] For example, the self-checking humidity detection device is placed in an environment with a humidity of about 20%. Since the first pipe is connected to the humidity environment through an opening, and the second pipe is always sealed, the air humidity in the first pipe is close to the air humidity in the slip ring chamber, while the air humidity in the second pipe remains dry. At this time, the first laser emitter and the second laser emitter are turned on respectively to obtain the first spectrum of the first pipe and the second spectrum of the second pipe.

[0076] S300, matching the first spectrum with the second spectrum, marking the frequency band in the first spectrum that does not belong to the second spectrum as the light wave frequency band of the water vapor scattered light wave, obtaining the first light wave amplitude of the light wave frequency band of the water vapor scattered light wave in the current environment, and calibrating the humidity value corresponding to the first light wave amplitude as the first humidity value;

[0077] S400, placing the first pipe in an environment with a second humidity value, obtaining a second light wave amplitude of a light wave frequency band of a water vapor scattered light wave in the current environment, calibrating a humidity value corresponding to the second light wave amplitude as a second humidity value, and the second humidity value is greater than the first humidity value;

[0078] Step S400 is repeated until the calibration of humidity values ​​corresponding to different light wave amplitudes in the light wave frequency band of the water vapor scattered light wave is completed, and a calibrated reference spectrum is obtained.

[0079] By comparing the first spectrum obtained through the first pipe and the second spectrum obtained through the second pipe, it can be found that the first spectrum has a certain frequency band of light waves added compared to the second spectrum. Since the second pipe is dry air, while the first pipe is air with 20% humidity, and the light waves of this band have not been found in the second pipe, during the marking process, only water vapor is added to the first pipe more than the second pipe, so this frequency range can be regarded as the characteristic frequency of water vapor. Therefore, the light waves of this frequency band are the water vapor scattered light waves under the device. The amplitude of the light waves of this frequency band is obtained, and the humidity value corresponding to the amplitude is calibrated to 20%. Then the first pipe is placed in an environment with a humidity of about 40%, and the above operation is repeated to obtain the spectrum of the first pipe in an environment with a humidity of 40%. It is found that when the first pipe is in an environment with a humidity of 40%, the amplitude of the water vapor scattered light waves is increased compared to the amplitude of the water vapor scattered light waves when the first pipe is in an environment with a humidity of 20%. The humidity value corresponding to the amplitude of the water vapor scattered light waves at this time is calibrated to 40%. Repeat the above process, for example, place the first pipe in an environment with a humidity of 20%, 40%, 60%, and 80% in turn, calibrate the humidity value corresponding to the amplitude of the water vapor scattered light wave, and complete the calibration of the reference spectrum.

[0080] Normally, when the relative humidity reaches 70% or even higher, water vapor molecules may easily condense into molecular clusters. At this time, the spectrum generated by Raman scattering may produce light in a new band. The corresponding features are marked by the image processor for feature recognition. After the light wave image is Fourier transformed, the spectrum formed will add light waves of new frequencies. When the light waves of this frequency are identified, the relative humidity range of the air corresponding to the light waves can be calibrated.

[0081] After obtaining the reference spectrum, the humidity of the environment to be detected can be obtained through the reference spectrum. Then, in this embodiment, the obtained spectrum is matched with the pre-calibrated reference spectrum, and the humidity value in the slip ring chamber is determined according to the matching result, including:

[0082] The target light wave frequency band is determined according to the obtained spectrum, and the target light wave frequency band is the light wave frequency band of the water vapor scattered light wave in the obtained spectrum; the target light wave amplitude of the target light wave frequency band is obtained, and the humidity value corresponding to the light wave amplitude matching the target light wave amplitude in the reference spectrum is used as the humidity value in the slip ring chamber.

[0083] When in use, the device is placed close to the inner wall of the generator slip ring chamber to be tested. The first pipe uses a metal pipe with good thermal conductivity and is placed close to the inner wall of the generator slip ring chamber. Because the actual temperature of the generator case may be lower than the air temperature, the temperature will directly affect the relative humidity. Therefore, placing the first pipe close to the metal wall of the generator collector ring chamber can more accurately obtain the relative humidity near the metal surface of the collector ring chamber. The laser transmitter in the first pipe is controlled to emit laser light to obtain the corresponding spectrum, and the obtained spectrum is matched with the pre-calibrated reference spectrum. If there is a light wave belonging to the light wave frequency band of water vapor scattered light waves in the obtained spectrum, it means that there is water vapor in the first pipe, and the amplitude of the light wave is obtained. The obtained light wave amplitude is matched with the light wave amplitude of the same frequency band in the reference spectrum, and the humidity value corresponding to the successfully matched light wave amplitude in the reference spectrum is used as the humidity value in the slip ring chamber.

[0084] The method of this embodiment also includes: when the interior of the second pipe is in an unsealed state, emitting a laser signal through the first signal generator and the second signal generator; the first signal receiver sends the laser signal sent by the first signal generator to the image processor, and the image processor processes the received laser signal to obtain a third spectrum; the second signal receiver sends the laser signal sent by the second signal generator to the image processor, and the image processor processes the received laser signal to obtain a fourth spectrum; the third spectrum is matched with the fourth spectrum to obtain a verification result.

[0085] Among them, matching the third spectrum with the fourth spectrum to obtain a verification result includes: matching the third spectrum with a pre-calibrated reference spectrum, determining the humidity value corresponding to the third spectrum according to the matching result, and matching the fourth spectrum with a pre-calibrated reference spectrum, determining the humidity value corresponding to the fourth spectrum according to the matching result; when the humidity value corresponding to the third spectrum matches the humidity value corresponding to the fourth spectrum, determining that the self-verifying humidity detection device is in a normal state; when the humidity value corresponding to the third spectrum does not match the humidity value corresponding to the fourth spectrum, determining that the self-verifying humidity detection device is in an abnormal state.

[0086] In order to ensure the accuracy of self-verification, the method also includes: determining that the self-verification type humidity detection device has a self-verification function: emitting a laser signal through a second signal generator, sending the laser signal emitted by the second signal generator to an image processor through a second signal receiver, and processing the received laser signal through the image processor to obtain a fifth spectrum; matching the fifth spectrum with a reference spectrum, and determining that the self-verification type humidity detection device has a self-verification function when there is no light wave frequency band in the fifth spectrum that matches the light wave frequency band of the water vapor scattered light wave.

[0087] In this embodiment, the sealed second pipe is filled with dry air. When in use, the humidity detection device can be set to automatically turn on the laser transmitter in the second pipe every day or after a period of time, and perform spectral analysis on the light wave signal received by the laser receiver in the second pipe, and compare the frequency of the spectrum obtained in the second pipe and the first pipe after Fourier transformation. Remove the light waves with repeated frequencies in the second pipe and the first pipe, and the remaining ones are the light waves formed after scattering by water vapor and impurities, which are made into the light wave frequency band to be verified, so that the redundant light wave bands generated by the aging of the laser system can be filtered out. Match the light wave frequency band to be verified with the calibrated water vapor scattered light wave frequency band to obtain the current environmental humidity, and other light waves are not processed. . If the light wave calibrated by the first pipe during the test is not found in the second pipe, it proves that water vapor has not entered the second pipe, and it is determined that the self-verification type humidity detection device still has the self-verification function; if the light wave calibrated by the first pipe during the test is found in the second pipe, it proves that the second pipe has leaked and entered water vapor, and it is determined that the self-verification type humidity detection device no longer has the self-verification function. After it is determined that the self-checking humidity detection device has a self-checking function, the first pipeline can be self-checked: when the unit stops working, the humidity in the slip ring chamber is reduced by a drying device. When the first pipeline detects that the humidity in the slip ring chamber is less than 40%, the sealing component of the second pipeline is opened to make the second pipeline and the slip ring chamber the same. At this time, the humidity of the first pipeline and the second pipeline is measured. If the difference between the humidity measurement values ​​of the two is less than a threshold value, it can be determined that the humidity measuring instrument of the first pipeline is valid. Otherwise, it is determined that the humidity measuring instrument of the first pipeline has failed.

[0088] The optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, a variety of simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0089] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0090] Those skilled in the art will understand that all or part of the steps in the method for implementing the above-mentioned embodiments can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor (processor) execute all or part of the steps of the method of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0091] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A self-checking humidity detection device for detecting the humidity in a slip ring chamber, characterized in that: include: A first pipeline, a second pipeline, a first signal generator, a first signal receiver, a second signal generator, a second signal receiver, a signal processor and a power supply; The first signal generator and the first signal receiver are arranged in the first pipe and are arranged at two ends of the first pipe opposite to each other. The first pipe is provided with an opening so that the air in the first pipe is connected with the air in the slip ring chamber. The second signal generator and the second signal receiver are arranged in the second pipe and are arranged at two ends of the second pipe opposite to each other, and the interior of the second pipe is sealed; The first signal generator and the second signal generator are connected to the power supply respectively, and the first signal receiver and the second signal receiver are connected to the signal processor respectively.

2. The self-checking humidity detection device according to claim 1, characterized in that: The first signal generator and the second signal generator are laser transmitters, the first signal receiver and the second signal receiver are laser receivers, and the signal processor is an image processor; The first signal generator and the second signal generator are used to generate laser signals, the first signal receiver is used to receive the laser signal generated by the first signal generator and send the received laser signal to the image processor, and the second signal receiver is used to receive the laser signal generated by the second signal generator and send the received laser signal to the image processor; The image processor is used to process the received laser signal to convert the received laser signal into a corresponding humidity value.

3. A humidity detection system for a self-checking slip ring chamber, characterized in that: include: The self-checking humidity detection device as claimed in any one of claims 1 to 2; A main controller; and a heating device disposed in the slip ring chamber; The main controller is connected to the self-checking humidity detection device and the heating device respectively; The self-checking humidity detection device is used to detect the humidity value in the slip ring chamber, and the main controller is used to control the heating device to heat when the humidity value in the slip ring chamber is greater than the humidity threshold until the humidity value in the slip ring chamber is no greater than the humidity threshold.

4. A method for detecting humidity in a slip ring chamber, characterized in that: Applied to the self-checking humidity detection device according to claim 2, the method comprises: emitting a laser signal through the first signal generator; receiving the laser signal emitted by the first signal generator through the first signal receiver and sending the received laser signal to the image processor; The received laser signal is processed by the image processor to obtain a corresponding spectrum, the obtained spectrum is matched with a pre-calibrated reference spectrum, and the humidity value in the slip ring chamber is determined according to the matching result. The reference spectrum at least includes light wave frequency bands and light wave amplitudes corresponding to different humidity values.

5. The method for detecting humidity in a slip ring chamber according to claim 4, characterized in that: The calibration method of the reference spectrum includes: performing a drying process on the first pipe and the second pipe; placing the first pipe in an environment with a humidity of a first humidity value, emitting a laser signal through the first signal generator, sending the laser signal emitted by the first signal generator to the image processor through the first signal receiver, and processing the received laser signal through the image processor to obtain a first spectrum; and The second signal generator emits a laser signal, the second signal receiver sends the laser signal emitted by the second signal generator to the image processor, and the image processor processes the received laser signal to obtain a second spectrum; Matching the first spectrum with the second spectrum, marking the frequency band in the first spectrum that does not belong to the second spectrum as the light wave frequency band of water vapor scattered light waves, obtaining the first light wave amplitude of the light wave frequency band of the water vapor scattered light waves in the current environment, and calibrating the humidity value corresponding to the first light wave amplitude as the first humidity value; placing the first pipe in an environment with a second humidity value, obtaining a second light wave amplitude of a light wave frequency band of the water vapor scattered light wave in the current environment, calibrating a humidity value corresponding to the second light wave amplitude as the second humidity value, wherein the second humidity value is greater than the first humidity value; The above process is repeated until the calibration of humidity values ​​corresponding to different light wave amplitudes in the light wave frequency band of the water vapor scattered light wave is completed, and a calibrated reference spectrum is obtained.

6. The method for detecting humidity in a slip ring chamber according to claim 5, characterized in that: Matching the obtained spectrum with a pre-calibrated reference spectrum, and determining the humidity value in the slip ring chamber according to the matching result, including: Determining a target light wave frequency band according to the obtained spectrum, wherein the target light wave frequency band is a light wave frequency band belonging to the light wave frequency band of the water vapor scattered light wave in the obtained spectrum; A target light wave amplitude in the target light wave frequency band is obtained, and a humidity value corresponding to a light wave amplitude in the reference spectrum that matches the target light wave amplitude is used as a humidity value in the slip ring chamber.

7. The method for detecting humidity in a slip ring chamber according to claim 5, characterized in that: The method further comprises: When the interior of the second pipe is in an unsealed state, emitting laser signals through the first signal generator and the second signal generator; The laser signal sent by the first signal generator is sent to the image processor through the first signal receiver, and the received laser signal is processed by the image processor to obtain a third spectrum, and the laser signal sent by the second signal generator is sent to the image processor through the second signal receiver, and the received laser signal is processed by the image processor to obtain a fourth spectrum; The third spectrum is matched with the fourth spectrum to obtain a verification result.

8. The method for detecting humidity in a slip ring chamber according to claim 7, characterized in that: Matching the third spectrum with the fourth spectrum to obtain a verification result includes: Matching the third spectrum with a pre-calibrated reference spectrum, and determining a humidity value corresponding to the third spectrum according to the matching result; and matching the fourth spectrum with a pre-calibrated reference spectrum, and determining a humidity value corresponding to the fourth spectrum according to the matching result; In the case where the humidity value corresponding to the third spectrum matches the humidity value corresponding to the fourth spectrum, determining that the self-checking humidity detection device is in a normal state; In the case that the humidity value corresponding to the third spectrum does not match the humidity value corresponding to the fourth spectrum, it is determined that the self-checking humidity detection device is in an abnormal state.

9. The method for detecting humidity in a slip ring chamber according to claim 5, characterized in that: The method further comprises: It is determined that the self-checking humidity detection device has a self-checking function.

10. The method for detecting humidity in a slip ring chamber according to claim 9, characterized in that: Determining that the self-checking humidity detection device has a self-checking function includes: The second signal generator emits a laser signal, the second signal receiver sends the laser signal emitted by the second signal generator to the image processor, and the image processor processes the received laser signal to obtain a fifth spectrum; The fifth spectrum is matched with the reference spectrum, and when there is no light wave frequency band in the fifth spectrum that matches the light wave frequency band of the water vapor scattered light wave, it is determined that the self-checking humidity detection device has a self-checking function.

Images