A gas detection device for SF6 decomposition components based on mid-infrared spectroscopy

Abstract

The present invention relates to the technical field of gas detection devices, and in particular to a SF6 decomposition component gas detection device based on mid-infrared spectroscopy, comprising a detection box, a gas detection mechanism for inspecting SOF2 gas for fault diagnosis is provided on the detection box, a laser protection mechanism for preventing laser beam dispersion is provided at the upper end of the detection box, an exhaust gas purification mechanism is provided on the gas detection mechanism, an automatic heat dissipation mechanism is provided inside the detection box, and the gas detection mechanism comprises a mounting bracket fixedly mounted on the side of the detection box, and a QCL laser is detachably mounted on the mounting bracket. The present invention generates a central wave number of 1351cm by setting a gas detection mechanism and utilizing the mutual cooperation between a QCL laser and a microphone. ‑1 The mid-infrared laser can automatically analyze the concentration of SOF2, the decomposition component of SF6, and can effectively avoid the interference of other decomposition components of SF6 such as H2S, SO2F2 and CO, thereby ensuring the accuracy of SOF2 detection results.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection devices, and in particular to a SF6 decomposition component gas detection device based on mid-infrared spectroscopy. Background Art

[0002] SF6 gas has excellent insulation and arc extinguishing properties and is widely used in gas-insulated equipment. When local electric shock occurs in SF6 equipment due to a fault, SF6 gas will decompose under the action of electric field energy to generate gases such as SOF2 and SO2F2. Therefore, the insulation monitoring and fault diagnosis of SF6 insulation equipment can be carried out by detecting the decomposition components of SF6 and the changes in their content.

[0003] In the prior art, mid-infrared spectroscopy is usually used to detect and analyze SOF2 gas. However, the main products of SF6 decomposition include not only SOF2 and SO2, but also gases such as H2S, SO2F2 and CO. These gases will interfere with the detection of SOF2 during the spectral analysis process, which will greatly reduce the accuracy of SOF2 gas detection. In addition, the detection device in the prior art has low integration and is inconvenient to use. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a SF6 decomposition component gas detection device based on mid-infrared spectroscopy, which solves the technical problem in the prior art that the accuracy of detection and analysis of SF6 decomposition components cannot be effectively guaranteed, and has the advantage of being able to automatically eliminate the influence of other interfering gases and effectively improve the detection accuracy.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a SF6 decomposition component gas detection device based on mid-infrared spectroscopy, comprising a detection box, a gas detection mechanism for inspecting SOF2 gas for fault diagnosis is provided on the detection box, a laser protection mechanism for preventing laser beam dispersion is provided on the upper end of the detection box, an exhaust gas purification mechanism is provided on the gas detection mechanism, and an automatic heat dissipation mechanism is provided inside the detection box. During fault detection, the gas detection mechanism will perform mid-infrared spectroscopy analysis on the gas in the gas-insulated equipment to determine whether the electrical equipment has partial discharge due to the fault. During the detection process, the exhaust gas purification mechanism will purify the exhaust gas. The gas detection mechanism includes a mounting bracket fixedly mounted on the side of the detection box, and an installation bracket is provided on the side of the detection box. A QCL laser is detachably mounted on the mounting bracket, a mounting seat body is arranged at the upper end of the detection box body, a leveling auxiliary mechanism for automatically leveling the mounting seat body is arranged on the detection box body, a photoacoustic cell for generating photoacoustic signals is arranged on the mounting seat body, calcium fluoride lenses are arranged at both ends of the photoacoustic cell respectively, a microphone for detecting photoacoustic signals and converting them into digital signals is arranged on the photoacoustic cell, a detection gas inlet and a detection gas outlet are symmetrically arranged at the upper end of the photoacoustic cell, a laser controller is arranged below the mounting bracket, a function generator capable of generating a fixed frequency modulation signal is arranged inside the detection box body, and a phase-locked amplifier is arranged on the side of the detection box body; after the microphone converts the sound signal into a digital signal, the phase-locked amplifier will perform phase-locked amplification processing on the digital signal, thereby displaying relevant concentration information.

[0006] Preferably, the QCL laser is coaxially arranged with the photoacoustic cell. When the QCL laser emits a laser of a certain frequency under the control of a laser controller, the laser beam will enter the photoacoustic cell horizontally through the calcium fluoride lens.

[0007] Preferably, the exhaust gas purification mechanism is located at the upper end of the detection gas outlet, and the gas will enter the interior of the exhaust gas purification mechanism through the detection gas outlet after being tested.

[0008] Preferably, the laser protection mechanism includes a rectangular long groove and a rectangular short groove opened at the upper end of the detection box, two movable sliders are symmetrically arranged inside the rectangular long groove, and a mounting protrusion is movably installed inside the rectangular short groove. A connecting bent rod is fixedly connected between the mounting protrusion and one of the movable sliders, a semicircular protective bent pipe is fixedly installed on the movable slider, a driving component for driving the movable slider to slide is provided on the inner wall of the rectangular long groove, a spherical bracket is fixedly installed on the mounting protrusion, and a cleaning ball is rotatably connected to the spherical bracket, and when the two movable sliders slide under the action of the driving component, the two protective bent pipes will be brought closer to or away from each other.

[0009] Preferably, an avoidance groove is opened between the rectangular long groove and the rectangular short groove, and the linkage bent rod passes through the inside of the avoidance groove. When the movable slider moves, it will cooperate with the linkage bent rod to make the installation protrusion move synchronously.

[0010] Preferably, the spherical bracket is provided with a micro motor for driving the cleaning ball to rotate, and the outside of the cleaning ball is wrapped with a cleaning sponge. When the mounting protrusion moves, the cleaning ball will move synchronously, and when the cleaning ball moves, the cleaning sponge will contact the laser head of the QCL laser.

[0011] Preferably, the exhaust gas purification mechanism includes a circular tank body fixedly mounted on the detection gas outlet, a primary filter plate is fixedly mounted inside the circular tank body, an activated carbon filter plate is arranged on the upper end of the primary filter plate, a tertiary filter plate is arranged on the upper end of the activated carbon filter plate, a ventilation bracket is arranged below the primary filter plate, a blowing assembly is fixedly mounted on the ventilation bracket, an exhaust duct is coaxially arranged on the upper end of the circular tank body, the primary filter plate is a mesh structure for supporting the activated carbon filter plate and the tertiary filter plate, the tertiary filter plate is a porous sponge structure, which can re-adsorb the gas molecules.

[0012] Preferably, the ventilation bracket is located above the detection gas outlet, and a ventilation slot is provided on the ventilation bracket. When the blowing assembly is working, the gas in the photoacoustic cell will quickly enter the interior of the circular tank and be discharged to the outside through the exhaust pipe.

[0013] Preferably, the leveling auxiliary mechanism includes a rectangular cavity opened at the upper end of the detection box, an installation platform is movably installed inside the rectangular cavity, a telescopic round rod is arranged below the corner of the installation platform, a horizontal sensor is fixedly installed at the lower end of the installation platform, and the installation seat is fixedly installed on the installation platform. When the installation platform is tilted, the horizontal sensor will automatically sound an alarm.

[0014] Preferably, the automatic heat dissipation mechanism includes a box inner cavity opened inside the detection box, a heat dissipation inclined groove is opened on the outer side of the box inner cavity, a heat dissipation fan is fixedly installed on the inner wall of the box inner cavity, a temperature sensor is arranged inside the box inner cavity, the temperature sensor and the heat dissipation fan are electrically connected through a wire, when the temperature inside the detection box reaches a preset value, the heat dissipation fan will be powered on and operated under the action of the temperature sensor, thereby quickly dissipating the heat in the box inner cavity to the outside.

[0015] By means of the above technical solution, the present invention provides a SF6 decomposition component gas detection device based on mid-infrared spectroscopy, which has at least the following beneficial effects:

[0016] 1. The present invention sets up a gas detection mechanism and utilizes the cooperation between the QCL laser and the microphone to generate a central wave number of 1351cm -1The mid-infrared laser can automatically analyze the concentration of SOF2, the decomposition component of SF6, and can effectively avoid the interference of other decomposition components of SF6 such as H2S, SO2F2 and CO, thereby ensuring the accuracy of SOF2 detection results.

[0017] 2. The present invention sets up a laser protection mechanism and utilizes the cooperation between the movable slider and the protective bend pipe. During gas analysis and detection, the laser emission area can be automatically shielded and protected to prevent dust and other impurities from falling between the QCL laser and the photoacoustic cell and affecting the laser beam. This can effectively improve the stability of the laser and thus ensure the accuracy of gas detection.

[0018] 3. The present invention sets a laser protection mechanism and utilizes the cooperation between the spherical bracket and the cleaning ball to automatically wipe and clean the laser head of the QCL laser before gas detection to prevent dust from adhering to the laser head. It can also prevent dust from dispersing the laser beam, thereby improving stability.

[0019] 4. The present invention provides a laser protection mechanism and utilizes the cooperation between the spherical bracket and the micro motor to automatically rotate the part of the cleaning ball that contacts the laser head to the inside of the spherical bracket after wiping and cleaning is completed, thereby preventing the dusty part of the cleaning ball from contacting the laser head again during the resetting process to cause contamination.

[0020] 5. The present invention adopts an integrated platform to detect and analyze the gas decomposition components by setting up a gas detection mechanism. It has a high degree of integration and can effectively improve the detection efficiency. Moreover, it can reduce the interference of ambient noise to a certain extent, thereby improving the accuracy of photoacoustic signal detection and also improving the accuracy of gas detection.

[0021] 6. The present invention provides an exhaust gas purification mechanism and utilizes the cooperation between the blowing assembly and the filter plate to automatically perform graded purification on the gas after the detection is completed, thereby removing most of the harmful components in the gas and effectively preventing these gases from being directly discharged and causing pollution to the surrounding air environment.

[0022] 7. The present invention provides a leveling auxiliary mechanism and utilizes the cooperation between the telescopic round rod and the level sensor to automatically and quickly level the photoacoustic cell, ensuring that the photoacoustic cell and the QCL laser are always in a horizontally aligned state, which can improve the accuracy of gas detection to a certain extent.

[0023] 8. The present invention provides an automatic heat dissipation mechanism and utilizes the cooperation between the heat dissipation fan and the temperature sensor to automatically and quickly dissipate the heat inside the detection box, thereby preventing precision components such as function generators and phase-locked amplifiers from being damaged by being in a high temperature environment for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of some structures in the present invention;

[0027] Figure 3 It is a structural schematic diagram of the gas detection mechanism in the present invention;

[0028] Figure 4 It is a structural schematic diagram of the laser protection mechanism in the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the cleaning ball in the present invention;

[0030] Figure 6 It is a structural schematic diagram of the linkage bending rod in the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of the exhaust gas purification mechanism in the present invention;

[0032] Figure 8 It is a structural schematic diagram of the automatic heat dissipation mechanism in the present invention;

[0033] Fig. 9 It is the infrared spectrum data diagram of the gas components in the present invention.

[0034] In the figure: 1. detection box; 2. gas detection mechanism; 201. mounting bracket; 202. QCL laser; 203. mounting seat; 204. photoacoustic cell; 205. calcium fluoride lens; 206. microphone; 207. detection gas inlet; 208. detection gas outlet; 209. laser controller; 210. function generator; 211. lock-in amplifier; 3. laser protection mechanism; 301. rectangular long groove; 302. rectangular short groove; 303. moving slider; 304. mounting bump; 305. linkage bending rod; 306. protection bending pipe; 307. Drive assembly; 308, spherical bracket; 309, cleaning ball; 4, exhaust gas purification mechanism; 401, circular tank; 402, primary filter plate; 403, activated carbon filter plate; 404, tertiary filter plate; 405, ventilation bracket; 406, blowing assembly; 407, exhaust duct; 5, leveling auxiliary mechanism; 501, rectangular cavity; 502, mounting platform; 503, telescopic round rod; 504, level sensor; 6, automatic heat dissipation mechanism; 601, box body; 602, heat dissipation chute; 603, heat dissipation fan; 604, temperature sensor. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] In the prior art, mid-infrared spectroscopy is usually used to detect and analyze the decomposed components of SF6. However, due to the presence of other potential interfering gases, the accuracy of SOF2 gas detection will be greatly reduced. In addition, the integration of the detection device is low and inconvenient to use. In order to solve this technical defect in the prior art, Figure 1 , Figure 2 as well as Figure 3As shown, this embodiment proposes a SF6 decomposition component gas detection device based on mid-infrared spectroscopy, which can automatically perform concentration analysis on the decomposition component SOF2 of SF6, and can effectively avoid the interference of other decomposition components of SF6 such as H2S, SO2F2 and CO. The device detection box 1 is provided with a gas detection mechanism 2 for inspecting SOF2 gas for fault diagnosis, and the upper end of the detection box 1 is provided with a laser protection mechanism 3 for preventing laser beam dispersion. The gas detection mechanism 2 is provided with an exhaust gas purification mechanism 4, and the interior of the detection box 1 is provided with an automatic heat dissipation mechanism 6. During fault detection, the gas detection mechanism 2 will perform mid-infrared spectroscopy analysis on the gas in the gas-insulated equipment, so as to determine whether the electrical equipment has caused partial discharge due to the fault. During the detection process, the exhaust gas purification mechanism 4 will purify the exhaust gas.

[0038] In order to quickly complete gas detection and determine the cause of the fault, the present embodiment is provided with a gas detection mechanism 2. Specifically, the gas detection mechanism 2 includes a mounting bracket 201 fixedly mounted on the side of the detection box 1, and a QCL laser 202 is detachably mounted on the mounting bracket 201. A mounting seat body 203 is disposed at the upper end of the detection box 1. A leveling auxiliary mechanism 5 for automatically leveling the mounting seat body 203 is disposed on the detection box 1. A photoacoustic cell 204 for generating photoacoustic signals is disposed on the mounting seat body 203. The QCL laser 202 is coaxially arranged with the photoacoustic cell 204. When the QCL laser 202 emits a laser of a certain frequency under the control of the laser controller 209, the laser beam will pass through the calcium fluoride lens. 205 horizontally enters the photoacoustic cell 204, calcium fluoride lenses 205 are respectively set at both ends of the photoacoustic cell 204, a microphone 206 for detecting the photoacoustic signal and converting the sound signal into a digital signal is provided on the photoacoustic cell 204, a detection gas inlet 207 and a detection gas outlet 208 are symmetrically set at the upper end of the photoacoustic cell 204, a laser controller 209 is arranged below the mounting bracket 201, a function generator 210 capable of generating a modulation signal of a certain frequency is arranged inside the detection box 1, a phase-locked amplifier 211 is arranged on the side of the detection box 1, after the microphone 206 converts the sound signal into a digital signal, the phase-locked amplifier 211 will perform phase-locked amplification processing on the digital signal, thereby displaying relevant concentration information.

[0039] According to the above content, when the staff uses the device to perform insulation monitoring and fault diagnosis on SF6 equipment, the gas will enter the interior of the photoacoustic cell 204 through the detection gas inlet 207. At the same time, the QCL laser 202 will emit a laser of a certain frequency under the action of the laser controller 209.

[0040] Since the main decomposition products of SF6 include SOF2, the potential interfering gases for its detection are H2S, SO2F2 and CO. In the mid-infrared band (wave number range of 400cm-1 4000cm -1 ), SO2 and SOF2 both have strong absorption, therefore, when selecting infrared light band to measure SO2 and SOF2, the mid-infrared band can be considered.

[0041] In this regard, we used the Fourier transform infrared spectroscopy experimental platform to obtain the following Fig. 9 In the infrared spectrum data shown in the figure, we chose the central wave number of 1354cm -1 In the mid-infrared laser, within this wavelength range, SO2 and SOF2 have strong absorption, while their interfering gases (H2S, CO and SO2F2) have weak absorption. Therefore, the interference of other decomposition components can be effectively avoided.

[0042] Next, the function generator 210 will generate a modulation signal of a certain frequency inside the photoacoustic cell 204. Then, the microphone 206 will detect the photoacoustic signal and convert the acoustic signal into a digital signal. Finally, the phase-locked amplifier 211 will perform phase-locked amplification processing on the digital signal converted by the microphone 206, thereby displaying the relevant concentration information and completing the gas component analysis.

[0043] In this embodiment, the gas detection mechanism 2 is provided, and the cooperation between the QCL laser 202 and the microphonic device 206 is utilized to generate a central wave number of 1351 cm -1 The mid-infrared laser can automatically perform concentration analysis on the decomposition component SOF2 of SF6, which can effectively avoid the interference of other decomposition components of SF6 such as H2S, SO2F2 and CO, thereby ensuring the accuracy of SOF2 detection results; moreover, this embodiment adopts an integrated platform to detect and analyze the gas decomposition components by setting up a gas detection mechanism 2, which has a high degree of integration and can effectively improve the detection efficiency. Moreover, it can reduce the interference of ambient noise to a certain extent, thereby improving the accuracy of photoacoustic signal detection, and also can improve the accuracy of gas detection.

[0044] Embodiment 2

[0045] In order to prevent dust and debris in the environment from falling between the QCL laser 202 and the photoacoustic cell 204 and affecting the laser beam, based on the first embodiment, as shown in FIG. Figure 1 , Figure 2 as well as Figure 4-Figure 6As shown, the present embodiment is provided with a laser protection mechanism 3. Specifically, the laser protection mechanism 3 comprises a rectangular long groove 301 and a rectangular short groove 302 which are provided at the upper end of the detection box 1. An avoidance groove is provided between the rectangular long groove 301 and the rectangular short groove 302. A linkage bent rod 305 passes through the inside of the avoidance groove. When the moving slider 303 moves, the installation protrusion 304 moves synchronously with the linkage bent rod 305. Two moving sliders 303 are symmetrically provided inside the rectangular long groove 301. A mounting protrusion 304 is movably installed inside the rectangular short groove 302. A linkage bent rod 305 is fixedly connected between the installation protrusion 304 and one of the moving sliders 303. A semi-movable A circular protective bend 306 and a driving component 307 for driving the movable slider 303 to slide are provided on the inner wall of the rectangular long groove 301. A spherical bracket 308 is fixedly installed on the mounting protrusion 304. A cleaning ball 309 is rotatably connected to the spherical bracket 308. When the two movable sliders 303 slide under the action of the driving component 307, the two protective bends 306 will be moved closer to or away from each other. The spherical bracket 308 is provided with a micro motor for driving the cleaning ball 309 to rotate. The outside of the cleaning ball 309 is wrapped with a cleaning sponge. When the mounting protrusion 304 moves, the cleaning ball 309 will move synchronously. When the cleaning ball 309 moves, the cleaning sponge will contact the laser head of the QCL laser 202.

[0046] According to the above content, initially, the two protective curved pipes 306 are in a state of being separated from each other, and the cleaning ball 309 is located next to the QCL laser 202 .

[0047] During gas detection, the two movable sliders 303 will approach each other under the action of the driving component 307. When the movable sliders 303 move, the two semicircular protective bends 306 will contact each other, thereby shielding the laser emission area and preventing impurities such as dust from falling between the QCL laser 202 and the photoacoustic cell 204.

[0048] Moreover, when the movable slider 303 moves, it will cooperate with the linked bent rod 305 to make the mounting protrusion 304 move synchronously. When the two protective bent tubes 306 contact each other, the mounting protrusion 304 will just move from one side of the QCL laser 202 to the other side. During the movement, the cleaning ball 309 will contact the laser head of the QCL laser 202, thereby wiping and cleaning the laser head to prevent dust from adhering to the laser head.

[0049] Subsequently, the cleaning ball 309 will rotate 180 degrees under the action of the micro motor, thereby rotating the portion that has just been in contact with the laser head to the inside of the spherical bracket 308, thereby preventing dust and other impurities from being brought onto the laser head again during the subsequent resetting process.

[0050] In this embodiment, by setting up the laser protection mechanism 3 and utilizing the mutual cooperation between the movable slider 303 and the protective bend 306, the laser emission area can be automatically shielded and protected during gas analysis and detection, so as to prevent dust and other impurities from falling between the QCL laser 202 and the photoacoustic cell 204 and affecting the laser beam, thereby effectively improving the stability of the laser and thus ensuring the accuracy of gas detection; moreover, by setting up the laser protection mechanism 3 and utilizing the mutual cooperation between the spherical bracket 308 and the cleaning ball 309, the laser head of the QCL laser 202 can be automatically wiped and cleaned before gas detection to prevent dust from adhering to the laser head, and dust can also be prevented from causing dispersion and other effects on the laser beam, thereby improving stability; in addition, by setting up the laser protection mechanism 3 and utilizing the mutual cooperation between the spherical bracket 308 and the micro motor, the part of the cleaning ball 309 in contact with the laser head can be automatically rotated to the inside of the spherical bracket 308 after wiping and cleaning is completed, so as to prevent the part of the cleaning ball 309 with dust from contacting the laser head again during the resetting process and causing contamination.

[0051] Embodiment 3

[0052] In order to prevent the detected exhaust gas from being directly discharged and causing pollution to the surrounding environment, based on the above embodiment, this embodiment is provided with an exhaust gas purification mechanism 4, such as Figure 1 , Figure 3 as well as Figure 7 As shown, the exhaust gas purification mechanism 4 includes a circular tank body 401 fixedly mounted on the detection gas outlet 208, a primary filter plate 402 is fixedly mounted inside the circular tank body 401, an activated carbon filter plate 403 is arranged at the upper end of the primary filter plate 402, a tertiary filter plate 404 is arranged at the upper end of the activated carbon filter plate 403, a ventilation bracket 405 is arranged below the primary filter plate 402, the ventilation bracket 405 is located above the detection gas outlet 208, ventilation grooves are opened on the ventilation bracket 405, when the blowing component 406 is working, the gas in the photoacoustic pool 204 will quickly enter the interior of the circular tank body 401 and be discharged outward through the exhaust pipe 407, a blowing component 406 is fixedly mounted on the ventilation bracket 405, an exhaust pipe 407 is coaxially arranged at the upper end of the circular tank body 401, the primary filter plate 402 is a mesh structure for supporting the activated carbon filter plate 403 and the tertiary filter plate 404, the tertiary filter plate 404 is a porous sponge structure, which can adsorb gas molecules again.

[0053] According to the above content, after the gas detection is completed, the gas inside the photoacoustic cell 204 will quickly enter the interior of the circular tank 401 under the action of the blowing component 406. Next, the activated carbon filter plate 403 and the three-stage filter plate 404 will adsorb the gas to remove harmful components in the detection gas.

[0054] This embodiment provides an exhaust gas purification mechanism 4, and utilizes the cooperation between the blowing assembly 406 and the filter plate to automatically perform graded purification on the gas after the detection is completed, remove most of the harmful components inside the gas, and effectively prevent these gases from being directly discharged and causing pollution to the surrounding air environment.

[0055] Embodiment 4

[0056] In order to automatically and quickly level the photoacoustic cell 204, based on the above embodiment, Figure 1-Figure 4 As shown, the present embodiment is provided with a leveling auxiliary mechanism 5. Specifically, the leveling auxiliary mechanism 5 includes a rectangular cavity 501 opened at the upper end of the detection box 1, and a mounting platform 502 is movably installed inside the rectangular cavity 501. A telescopic round rod 503 is provided below the corner of the mounting platform 502. A horizontal sensor 504 is fixedly installed at the lower end of the mounting platform 502. The mounting seat body 203 is fixedly installed on the mounting platform 502. When the mounting platform 502 is tilted, the horizontal sensor 504 will automatically sound an alarm.

[0057] When installing and debugging the equipment, Figure 4 As shown, the four telescopic rods 503 can be extended upwards individually. When the installation platform 502 is in a tilted state, the horizontal sensor 504 will automatically sound an alarm. Next, the staff will use the telescopic rods 503 to quickly level the installation platform 502, which can effectively ensure that the photoacoustic cell 204 and the QCL laser 202 are in a horizontal alignment state.

[0058] This embodiment provides a leveling auxiliary mechanism 5, and utilizes the cooperation between the telescopic rod 503 and the level sensor 504 to automatically and quickly level the photoacoustic cell 204, thereby ensuring that the photoacoustic cell 204 and the QCL laser 202 are always in a horizontally aligned state, thereby improving the accuracy of gas detection to a certain extent.

[0059] Embodiment 5

[0060] In order to prevent the function generator 210, the lock-in amplifier 211 and other precision components from being damaged due to high temperature, based on the above embodiment, Figure 2 and Figure 8As shown, the present embodiment is provided with an automatic heat dissipation mechanism 6. Specifically, the automatic heat dissipation mechanism 6 includes a box inner cavity 601 opened inside the detection box 1, a heat dissipation inclined groove 602 is opened on the outer side of the box inner cavity 601, a heat dissipation fan 603 is fixedly installed on the inner side wall of the box inner cavity 601, a temperature sensor 604 is arranged inside the box inner cavity 601, and the temperature sensor 604 is electrically connected to the heat dissipation fan 603 through a wire. When the temperature inside the detection box 1 reaches a preset value, the heat dissipation fan 603 will be powered on and operated under the action of the temperature sensor 604, so as to quickly discharge the heat in the box inner cavity 601 to the outside.

[0061] During the gas detection process, the temperature sensor 604 will continuously monitor the temperature inside the detection box 1. When the temperature reaches a preset value, the heat dissipation fan 603 will enter the working state under the control of the temperature sensor 604, thereby quickly dissipating the heat in the inner cavity 601 of the box.

[0062] This embodiment provides an automatic heat dissipation mechanism 6, and utilizes the cooperation between the heat dissipation fan 603 and the temperature sensor 604 to automatically and quickly dissipate the heat inside the detection box 1, thereby preventing precision components such as the function generator 210 and the phase-locked amplifier 211 from being damaged due to being in a high temperature environment for a long time.

[0063] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A SF6 decomposition component gas detection device based on mid-infrared spectroscopy, comprising a detection box (1), characterized in that: The detection box (1) is provided with a gas detection mechanism (2) for detecting SOF2 gas for fault diagnosis, the upper end of the detection box (1) is provided with a laser protection mechanism (3) for preventing laser beam dispersion, the gas detection mechanism (2) is provided with an exhaust gas purification mechanism (4), and the interior of the detection box (1) is provided with an automatic heat dissipation mechanism (6); The gas detection mechanism (2) comprises a mounting bracket (201) fixedly mounted on the side of a detection box (1); a QCL laser (202) is detachably mounted on the mounting bracket (201); a mounting seat body (203) is arranged at the upper end of the detection box (1); a leveling auxiliary mechanism (5) for automatically leveling the mounting seat body (203) is arranged on the detection box (1); a photoacoustic pool (204) for generating a photoacoustic signal is arranged on the mounting seat body (203); and two ends of the photoacoustic pool (204) are respectively arranged A calcium fluoride lens (205) is provided, a microphone (206) for detecting photoacoustic signals and converting them into digital signals is provided on the photoacoustic cell (204), a detection gas inlet (207) and a detection gas outlet (208) are symmetrically provided at the upper end of the photoacoustic cell (204), a laser controller (209) is provided below the mounting bracket (201), a function generator (210) capable of generating a fixed frequency modulation signal is provided inside the detection box (1), and a lock-in amplifier (211) is provided on the side of the detection box (1); The laser protection mechanism (3) comprises a rectangular long slot (301) and a rectangular short slot (302) provided at the upper end of the detection box (1); two movable sliders (303) are symmetrically arranged inside the rectangular long slot (301); a mounting protrusion (304) is movably installed inside the rectangular short slot (302); a linkage bent rod (305) is fixedly connected between the mounting protrusion (304) and one of the movable sliders (303); a semicircular protective bent pipe (306) is fixedly installed on the movable slider (303); a driving component (307) for driving the movable slider (303) to slide is provided on the inner wall of the rectangular long slot (301); a spherical bracket (308) is fixedly installed on the mounting protrusion (304); and a cleaning ball (309) is rotatably connected to the spherical bracket (308).

2. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 1 is characterized in that: The QCL laser (202) is coaxially arranged with the photoacoustic cell (204).

3. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 1 is characterized in that: The exhaust gas purification mechanism (4) is located at the upper end of the detection gas outlet (208).

4. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 1 is characterized in that: An escape groove is provided between the rectangular long groove (301) and the rectangular short groove (302), and the linkage bent rod (305) passes through the inside of the escape groove.

5. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 1 is characterized in that: The spherical bracket (308) is provided with a micro motor for driving the cleaning ball (309) to rotate, and the outside of the cleaning ball (309) is wrapped with a cleaning sponge.

6. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 1 is characterized in that: The exhaust gas purification mechanism (4) comprises a circular tank body (401) fixedly mounted on the detection gas outlet (208), a primary filter plate (402) fixedly mounted inside the circular tank body (401), an activated carbon filter plate (403) disposed at the upper end of the primary filter plate (402), a tertiary filter plate (404) disposed at the upper end of the activated carbon filter plate (403), a ventilation bracket (405) disposed below the primary filter plate (402), a blowing assembly (406) fixedly mounted on the ventilation bracket (405), and an exhaust pipe (407) coaxially disposed at the upper end of the circular tank body (401).

7. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 6 is characterized in that: The ventilation bracket (405) is located above the detection gas outlet (208), and a ventilation slot is provided on the ventilation bracket (405).

8. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 1 is characterized in that: The leveling auxiliary mechanism (5) comprises a rectangular cavity (501) opened at the upper end of the detection box (1), a mounting platform (502) is movably installed inside the rectangular cavity (501), a telescopic round rod (503) is arranged below the corner of the mounting platform (502), and a level sensor (504) is fixedly installed at the lower end of the mounting platform (502).

9. The SF6 decomposition component gas detection device based on mid-infrared spectroscopy according to claim 1 is characterized in that: The automatic heat dissipation mechanism (6) comprises a box inner cavity (601) opened inside the detection box (1), a heat dissipation inclined groove (602) is opened on the outer side of the box inner cavity (601), a heat dissipation fan (603) is fixedly installed on the inner side wall of the box inner cavity (601), and a temperature sensor (604) is arranged inside the box inner cavity (601).

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