Hydrogen concentration detection device

Abstract

The invention relates to the technical field of hydrogen concentration optical visual detection, in particular to a hydrogen concentration detection device which comprises a detection table, an optical test device body arranged on the detection table, and a detection pipeline body arranged on the detection table and provided with one end communicated with the optical test device body. To-be-detected gas enters the detection pipeline body and then is subjected to visual detection through the optical testing device body, and a butt joint, a mixing assembly, a buffer assembly, a speed reduction assembly and a reflection assembly are sequentially arranged in the detection pipeline body in the gas entering direction; the mixing assembly, the buffer assembly, the speed reduction assembly and the reflection assembly are sequentially arranged in the detection pipeline body, the optical regulation and control means of the light beam splitter and the concave lens are combined, the problem of uneven hydrogen distribution is solved through the mixing assembly, the gas flow rate is reduced through the buffer assembly and the speed reduction assembly, and the contact time is prolonged; finally, the optical path is obviously prolonged through the optical assembly, and detection signals are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of optical visual detection of hydrogen concentration, and in particular to a hydrogen concentration detection device. Background Art

[0002] For some specific transmission pipelines, it is necessary to inspect the pipelines regularly to determine whether there is a hydrogen leak. The hydrogen molecules have characteristic absorption lines at specific wavelengths (such as the near-infrared or mid-infrared bands). An optical testing device (such as TDLAS, tunable diode laser absorption spectroscopy) is used to emit a laser of the corresponding wavelength. After the laser passes through the gas to be tested, the attenuation of the light intensity is detected by visual inspection.

[0003] When using an optical testing device to emit specific light waves into the detection pipe to detect hydrogen in the gas to be detected, the gas entering the detection pipe is often mixed with other gas components, which may interfere with the detection accuracy. This detection method relies on the absorption characteristics of hydrogen for light waves of a specific wavelength. However, when the hydrogen is sparsely or unevenly distributed in the gas to be tested, it will significantly affect the sensitivity and accuracy of the detection. In addition, the diffusion process of the gas in the detection pipe needs to be kept slow and stable. If the gas flow rate is too fast, it will reduce the effective contact time between the light wave and the hydrogen molecules, thereby affecting the detection efficiency. At the same time, due to the limitation of the optical path length in the detection pipe, the distance between the light wave and the gas is limited, which further restricts the detection performance and is not conducive to achieving high-precision and high-reliability gas detection effects.

[0004] Based on this, the present invention discloses a hydrogen concentration detection device. Summary of the Invention

[0005] To address the problem, raised in the background art, that when using tunable laser absorption spectroscopy to detect hydrogen, factors such as complex gas composition, uneven hydrogen distribution, excessively fast flow rate, and limited optical path can reduce the sensitivity, accuracy, and overall performance of detection, the present invention provides a hydrogen concentration detection device, comprising a detection platform, an optical testing device body disposed on the detection platform, and a detection pipe body disposed on the detection platform, one end of which is connected to the optical testing device body. The detection pipe body is provided with a butt joint for connecting to a pipeline to be detected at one end of the detection pipe body remote from the optical testing device body. After the gas to be detected enters the detection pipe body through the butt joint and connects to the detection pipe body, it is visually detected by the optical testing device body. Since the gas that directly enters the detection pipeline body through the pipeline to be detected may contain other gases, and hydrogen is diffused in the pipeline, the detection method of using specific light waves to absorb hydrogen in contact with the hydrogen will not be uniform, which will affect the detection of hydrogen leakage and its concentration. This technical solution adopts the method of mixing the gas to be detected before the hydrogen enters the detection pipeline body for detection, so that the hydrogen is in a relatively uniform state in the mixed gas.

[0006] As a further improvement of the present technical solution, a mixing assembly for mixing the gas to be detected is first provided in the detection pipe body along the gas entry direction, the mixing assembly includes a gas collecting hood and a stirring fan, after the gas to be detected enters the detection pipe body through the docking joint, it is accelerated by the gas collecting hood and then drives the stirring fan to rotate to achieve mixing of the gas to be detected, that is, the mixing assembly includes a rotating rod perpendicular to the axial direction of the detection pipe body, the upper and lower ends of the rotating rod are respectively fixed with a first stirring fan and a second stirring fan, and the docking joint is provided with a first gas collecting hood and a second stirring fan connected to the detection pipe body. Two air gathering hoods, the air outlets of the first air gathering hood and the second air gathering hood are respectively arranged on one side of the first stirring fan and the second stirring fan, the mixing assembly also includes a connecting rod, the middle position of the rotating rod is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is fixed on the first buffer disk; it is worth mentioning that the first air gathering hood and the second air gathering hood are conical structures, and the narrower air outlets of the conical structures of the first air gathering hood and the second air gathering hood are arranged close to the stirring fan, secondly, the first air gathering hood and the second air gathering hood are arranged diagonally, so that the rotation directions of the first stirring fan and the second stirring fan are opposite.

[0007] On this basis, since the gas flow rate is relatively high when it just enters the detection pipe body, the high gas flow rate is not conducive to the full contact between the laser and the gas to be detected, thus affecting the detection efficiency and detection results; and since the gas flow rate is further increased by the acceleration of the gas collecting hood, it is necessary to decelerate the gas when the gas to be detected enters the detection zone, so that it slowly enters the detection zone and contacts with the laser beam for absorption; As a further improvement of the present technical solution, a buffer assembly and a deceleration assembly are sequentially arranged in the detection pipe body behind the mixing assembly along the gas entry direction, wherein the buffer assembly includes a first buffer disk and a second buffer disk connected by an elastic telescopic structure, and the accelerated gas to be detected is buffered and decelerated by the first buffer disk and the second buffer disk; the elastic telescopic structure includes a buffer box symmetrically arranged in the detection pipe body, a sliding cavity is opened in the buffer box along the axial direction of the detection pipe body, a slider is slidably arranged in the sliding cavity, a buffer spring is arranged in the sliding cavity, the slider is slidably connected in the sliding cavity by the buffer spring, a sliding rod is provided on the slider, one end of the sliding rod is fixedly connected to the slider, and the other end is fixedly connected to the first buffer disk; a mounting rod is fixedly provided on the side of the first buffer disk away from the connecting rod, and the second buffer disk is fixed on the mounting rod, and a first mounting ring is fixedly provided in the detection pipe body, and the first mounting ring and the second buffer disk are fitted to form a sealing structure; secondly, the second buffer disk is a truncated cone structure, and the first mounting ring is an inward concave structure adapted to the structure of the second buffer disk.

[0008] In order to disperse the gas into the detection area instead of forming a flow; As a further improvement of the present technical solution, the deceleration assembly includes a second mounting ring fixed in the detection pipe body, a flow opening is opened at the center position of the second mounting ring, and several circles of windshield strips are circumferentially arranged in the flow opening for secondary deceleration of the gas, and the several circles of windshield strips are staggered.

[0009] In another solution, the gas to be tested, after being decelerated by the first and second buffer trays, is then dispersed by windshield strips and slowly enters the detection zone for testing. However, since the detection laser emitted by the optical testing device has a limited optical path within the limited detection zone, this affects the contact and absorption of the laser with the gas to be tested, which is not conducive to improving detection efficiency and test results. As a further improvement of the present technical solution, a detection interval reflection assembly is provided at the rear of the deceleration assembly. Secondly, since the laser emitted by the optical testing device body is a single beam and is axially oriented with the detection pipe body, it is not conducive to increasing the optical path within the detection interval. Therefore, a DOE beam splitter is provided in the detection pipe body near the emitting end of the optical testing device body, and a concave lens is provided in the detection pipe body on the side of the DOE beam splitter away from the optical testing device body; wherein, the reflection assembly includes a reflection tube with a reflective coating provided on the inner part of the detection pipe body, and a reflection disk is provided in the reflection tube near the position of the deceleration assembly, and the detection laser emitted by the optical testing device body is reflected multiple times by the reflection tube and the reflection disk to increase the optical path; the position of the reflection disk is provided near the deceleration assembly, and the deflection angle formed by the laser reflected on the reflection disk is symmetrical with the deflection angle of the laser refracted by the concave lens.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. In this hydrogen concentration detection device, uniform gas mixing is achieved to solve the problem of hydrogen diffusion. The conical acceleration structure of the first and second gas collecting hoods is used to directionally spray the airflow to the first and second stirring fans. Due to the diagonal layout of the gas collecting hoods, the two fan blades rotate in opposite directions to form upper and lower counter-currents, and forced convection mixing enables hydrogen to be evenly distributed at the molecular level within the mixing range, eliminating the concentration gradient caused by background gas interference and improving the TDLAS recognition accuracy of characteristic absorption peaks.

[0011] 2. In this hydrogen concentration detection device, three-level coordinated deceleration is achieved, the action time of light and gas is optimized, and the high-speed airflow impacts the first buffer disk and the second buffer disk, and the kinetic energy is absorbed by the buffer spring and the damping sliding cavity; the conical structure of the second buffer disk and the concave sealing surface of the first mounting ring form a turbulent dissipation channel, the kinetic energy is step-by-step attenuated, the gas flow rate is reduced to a laminar state, and the action time of hydrogen molecules and laser is extended to meet the absorption dynamics requirements; secondly, turbulent flow is broken up and decelerated, and the escaping gas is cut by the staggered windshield strips to form a dispersed micro-airflow; the airflow is diffused to avoid local high-speed flow, ensure that the gas enters the detection area at a uniform low speed, and eliminate the absorption signal jitter caused by flow velocity fluctuations.

[0012] 3. In this hydrogen concentration detection device, optical path multiplication and detection enhancement are achieved. First, the DOE beam splitter splits a single laser beam into multiple parallel beams. After refraction through a concave lens, the incident angle is offset, the spatial sampling density is improved, and missed detection caused by local fluctuations in hydrogen concentration is avoided; secondly, a closed-loop reflection light path is used, and the refracted light forms a V-shaped reflection chain between the reflection tube coating and the reflection disk; the deflection angle of the reflection disk is symmetrical with the refraction angle of the concave lens, forming a self-closed-loop optical path, effectively doubling the optical path, which is conducive to expanding the propagation path of the laser within the detection range, increasing the interaction distance and time between the light wave and the hydrogen molecules, thereby enhancing the intensity of the absorption signal and improving the detection resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the detection pipeline body of the present invention; Figure 3 is a front view of the cross-sectional structure of the reflector tube of the present invention; Figure 4 is a cross-sectional view of the structure of the reflector tube of the present invention; Figure 5 It is a structural schematic diagram of the buffer assembly of the present invention; Figure 6 It is a structural schematic diagram of the deceleration assembly of the present invention; Figure 7 It is a schematic diagram of the light beam reflection state in the reflection tube of the present invention.

[0014] The meaning of each number in the figure is: 1. Test bench; 2. Test pipe body; 3. Butt joint; 4. Optical test device body; 5. Mixing assembly; 6. Buffer assembly; 7. Speed ​​reduction assembly; 8. DOE beam splitter; 9. Concave lens; 10. Reflection assembly; 51. First gas gathering hood; 52. First stirring fan; 53. Rotating rod; 54. Second stirring fan; 55. Second gas gathering hood; 56. Connecting rod; 61. First buffer tray; 62. Buffer box; 63. Sliding cavity; 64. Sliding block; 65. Sliding rod; 66. Buffer spring; 67. Mounting rod; 68. First mounting ring; 69. Second buffer tray; 71. Second mounting ring; 72. Wind deflector; 101. Reflection tube; 102. Reflection dish. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0016] When using tunable laser absorption spectroscopy technology to detect hydrogen, factors such as complex gas composition, uneven hydrogen distribution, excessively fast flow rate, and limited optical path length will reduce the sensitivity, accuracy, and overall performance of the detection.

[0017] To this end, the present invention provides a hydrogen concentration detection device, see Figure 1 As shown, it includes a detection platform 1, on which an optical testing device body 4 is provided, and a detection pipe body 2 with one end connected to the optical testing device body 4 is provided on the detection platform 1. The end of the detection pipe body 2 away from the optical testing device body 4 is provided with a docking joint 3 for connecting with the pipeline to be detected. After the gas to be detected is connected with the detection pipe body 2 through the docking joint 3, it enters the detection pipe body 2 and is visually detected by the optical testing device body 4.

[0018] It should be noted that the optical testing device body 4 in the present invention includes a laser emitter and a photodetector. That is, the laser emitter emits a specific light wave that comes into contact with hydrogen and is absorbed by the photodetector. The photodetector detects the degree of light intensity attenuation, converts the light signal into a current signal, and then extracts the absorption characteristics through a phase-locked amplifier to achieve visual presentation. As for photodetectors, they are existing mature technologies, such as InGaAs photodiodes, germanium detectors or photomultiplier tubes. At the same time, there are actual product applications such as Tiger Optics HALO H2 gas trace hydrogen analyzer and JNYQ-O-15 laser gas analyzer.

[0019] For details, see Figure 2-Figure 4 As shown, since the gas that directly enters the detection pipe body 2 through the pipeline to be detected may contain other gases, and hydrogen is diffused in the pipeline, and the detection method based on the absorption of specific light waves by contact with hydrogen is not uniform, this will affect the detection of hydrogen leakage and its concentration. Therefore, the present invention adopts the method of mixing the gas to be detected before the hydrogen enters the detection pipe body 2 for detection, so that the hydrogen is in a relatively uniform state in the mixed gas. Specifically, a mixing component 5 for mixing the gas to be detected is first provided in the detection pipe body 2 along the gas entry direction; Among them, the mixing component 5 includes a gas collecting hood and a stirring fan. After the gas to be detected enters the detection pipe body 2 through the docking joint 3, it is accelerated by the gas collecting hood and then drives the stirring fan to rotate to achieve mixing of the gas to be detected. That is to say, the mixing component 5 includes a rotating rod 53 perpendicular to the axial direction of the detection pipe body 2, and the upper and lower ends of the rotating rod 53 are respectively fixed with a first stirring fan 52 and a second stirring fan 54. The docking joint 3 is provided with a first gas collecting hood 51 and a second gas collecting hood 55 connected to the detection pipe body 2, and the air outlets of the first gas collecting hood 51 and the second gas collecting hood 55 are respectively facing The first stirring fan 52 and the second stirring fan 54 are arranged on one side, and the mixing assembly 5 also includes a connecting rod 56. The middle position of the rotating rod 53 is rotatably connected to one end of the connecting rod 56, and the other end of the connecting rod 56 is fixed on the first buffer disk 61; it is worth mentioning that the first air collecting hood 51 and the second air collecting hood 55 are conical structures, and the narrower air outlets of the conical structures of the first air collecting hood 51 and the second air collecting hood 55 are close to the stirring fan. Secondly, the first air collecting hood 51 and the second air collecting hood 55 are arranged diagonally, so that the rotation directions of the first stirring fan 52 and the second stirring fan 54 are opposite.

[0020] During operation, after the pipeline to be detected is connected to the detection pipeline body 2 through the docking joint 3, gas begins to enter through the docking joint 3, and after the gas in the pipeline passes through the first gas collecting hood 51 and the second gas collecting hood 55, the airflow will be accelerated due to the conical structure of the first gas collecting hood 51 and the second gas collecting hood 55, and the accelerated gas to be detected is blown toward the first stirring fan 52 and the second stirring fan 54 respectively. Since the first gas collecting hood 51 and the second gas collecting hood 55 are arranged diagonally, the first gas collecting hood 51 and the second gas collecting hood 55 will blow toward the corresponding first stirring fan 52 and the second stirring fan 54, which will cause the first stirring fan 52 and the second stirring fan 54 to be in opposite directions. Rotate, so that after the gas is stirred by the first stirring fan 52 and the second stirring fan 54, the gas entering the detection pipe body 2 will be mixed, so that the hydrogen in the gas to be detected is no longer in a diffuse state, but is dispersed into the entire gas to be detected, which is convenient for subsequent detection. Letting the first stirring fan 52 and the second stirring fan 54 rotate in opposite directions will cause the upper and lower intervals of the gas to be detected in the mixing interval to form vortices in opposite directions. When the two vortices collide, the stirring intensity is increased, that is, the gas to be detected in the entire mixing component 5 interval can be more fully mixed, and then, pave the way for subsequent detection.

[0021] For further information, see Figure 4-Figure 6 As shown, since the gas flow rate just entering the detection pipe body 2 is relatively high, the high gas flow rate is not conducive to the full contact between the laser and the gas to be detected, thus affecting the detection efficiency and detection results; and due to the acceleration through the gas hood, the air flow speed is further increased, so it is necessary to decelerate the gas to be detected when it enters the detection interval, so that it slowly enters the detection interval and contacts and absorbs the laser beam. Therefore, the present invention adopts a buffer component 6 and a deceleration component 7 arranged in sequence behind the mixing component 5 in the detection pipe body 2 along the gas entry direction, wherein the buffer component 6 includes a plurality of components connected by an elastic telescopic structure. The first buffer disk 61 and the second buffer disk 69 are connected, and the accelerated gas to be detected passes through the first buffer disk 61 and the second buffer disk 69 for buffering and deceleration; the elastic telescopic structure includes a buffer box 62 symmetrically arranged in the detection pipe body 2, and a sliding cavity 63 is opened in the buffer box 62 along the axial direction of the detection pipe body 2. A slider 64 is slidably arranged in the sliding cavity 63, and a buffer spring 66 is provided in the sliding cavity 63. The slider 64 is slidably connected to the sliding cavity 63 through the buffer spring 66. A sliding rod 65 is provided on the slider 64, and one end of the sliding rod 65 is fixedly connected to the slider 64, and the other end is fixedly connected to the first buffer disk 61; It is worth mentioning that a mounting rod 67 is fixed on the side of the first buffer disk 61 away from the connecting rod 56, and the second buffer disk 69 is fixed on the mounting rod 67. A first mounting ring 68 is fixed in the detection pipe body 2, and the first mounting ring 68 and the second buffer disk 69 are fitted to form a sealing structure; secondly, the second buffer disk 69 is a frustum-shaped structure, and the first mounting ring 68 is a concave structure adapted to the structure of the second buffer disk 69.

[0022] After the double deceleration by the first buffer disk 61 and the second buffer disk 69, the gas is decelerated for the third time by the deceleration component 7. The deceleration is to disperse the gas into the detection range rather than forming an airflow. Specifically, the deceleration component 7 includes a second mounting ring 71 fixed in the detection pipe body 2. A flow opening is provided at the center of the second mounting ring 71. Several circles of windshield strips 72 for secondary deceleration of the gas are circumferentially arranged in the flow opening, and the several circles of windshield strips 72 are staggered.

[0023] During operation, the gas to be detected after being mixed by the first stirring fan 52 and the second stirring fan 54 begins to enter the buffer zone, and first passes through the first buffer plate 61 for the first blockage. The gas to be detected after being blocked will partially return to the vicinity of the first stirring fan 52 and the second stirring fan 54 to continue mixing, further increasing the mixing of the gases, and after escaping, it begins to impact the second buffer plate 69, and the second buffer plate 69 forms a second blockage. Under the blocking effect of the first buffer plate 61 and the second buffer plate 69, and the increase of the gas to be detected in the mixing interval, the first buffer plate 61 and the second buffer plate 69 begin to be impacted and spread toward the depth of the detection pipe body 2. The first buffer plate 61 and the second buffer plate 69 are buffered by the slider 64 and the buffer spring 66, and a damping layer is provided in the sliding cavity 63. To absorb and accelerate the kinetic energy of the gas to be detected after mixing, so that when the gas to be detected after acceleration and mixing rushes to the first buffer disk 61 and the second buffer disk 69, most of the kinetic energy will be absorbed instantly, so that the gas will escape slowly. The concave and truncated cone structure design of the first mounting ring 68 and the second buffer disk 69 can play a good sealing role when the gas rushes out instantly, so that the slider 64 and the buffer spring 66 can better play a buffering role. Secondly, the subsequent escaping gas will escape through the wedge-shaped inclined surfaces around the second buffer disk 69 and will first impact the inner wall of the detection pipe body 2, further reducing the kinetic energy of the gas. Therefore, the first mounting ring 68 and the second buffer disk 69 can play a better sealing role, play a buffering role, and allow the gas to hit the inner wall of the detection pipe body 2 after escaping to reduce the kinetic energy. When the gas finally escapes through the wedge-shaped slopes around the second buffer disk 69 and enters the deceleration zone, the kinetic energy of the gas entering here is very small. However, if the gas forms streams, the speed will be faster. Therefore, after passing through several circles of staggered windshields 72 at the flow port position, the airflow will be broken up by the windshields 72, allowing the mixed airflow to gradually disperse and enter the detection zone, facilitating subsequent detection.

[0024] For further information, see Figure 3 、 Figure 4 and Figure 7 As shown, the gas to be detected after being decelerated by the first buffer disk 61 and the second buffer disk 69 is then broken up by the windshield strip 72 and slowly enters the detection interval for detection. However, since the detection laser emitted by the optical testing device body 4 has a limited optical path within the limited detection interval, this will affect the contact and absorption of the laser with the gas to be detected, which is not conducive to improving the detection efficiency and detection results. Therefore, the present invention adopts a detection interval reflection component 10 located behind the deceleration component 7. Secondly, since the laser emitted by the optical testing device body 4 is a single beam and is in the same axial direction as the detection pipe body 2, it is not To facilitate increasing the optical path length within the detection interval, a DOE beam splitter 8 is provided in the detection pipe body 2 near the emission end of the optical testing device body 4, and a concave lens 9 is provided in the detection pipe body 2 on the side of the DOE beam splitter 8 away from the optical testing device body 4. The reflective assembly 10 includes a reflective tube 101 disposed within the detection pipe body 2 and having a reflective coating on the interior. A reflective disk 102 is provided in the reflective tube 101 near the deceleration assembly 7. The detection laser emitted by the optical testing device body 4 is multiply reflected by the reflective tube 101 and the reflective disk 102 to increase the optical path length. It is worth mentioning that the reflective disk 102 is located adjacent to the deceleration assembly 7 , and the deflection angle formed by the laser reflected from the reflective disk 102 is symmetrical to the deflection angle of the laser refracted by the concave lens 9 .

[0025] When working, Figure 7As shown, the gas is decelerated in the deceleration zone and then dispersed into the monitoring zone. It must first be blocked by the reflective disk 102, so that the reflective disk 102 will further block the gas. Finally, the gas gradually enters the reflective tube 101 through the surroundings of the reflective disk 102 and begins to absorb and detect the internal laser. The laser emitted by the optical testing device body 4 first passes through the DOE beam splitter 8 to split it into several beams of equal amount. The DOE beam splitter 8 is an existing mature technology and will not be described in detail here. It changes the original single beam laser into multiple parallel beams of laser light, and then passes through the concave lens 9 for refraction, so that the laser beam originally parallel to the axis of the reflective disk 102 begins to be emitted toward the inner wall of the reflective disk 102. In this way, the laser beam originally parallel to the axis of the reflective disk 102 cooperates with the reflective disk 102 to only reflect back and forth parallel to the axis of the reflective disk 102. After refraction by the concave lens 9, it appears as shown in FIG. Figure 7 The reflection situation shown can greatly increase the optical path, allowing the laser to fully contact and absorb with the gas, which is convenient for subsequent visual detection of the attenuation degree of the light wave. Specifically, the laser refracts the concave lens 9 to the inner wall of the reflection tube 101, and then continues to reflect to form a V-shaped route. When it reaches the position of the reflection disk 102, its reflection angle is exactly symmetrical with the deflection angle of the laser when it is refracted from the concave lens 9. In this way, the laser will be reflected back to the reflection tube 101 through the reflection disk 102, thus forming a VB-shaped route to reflect back. This back and forth greatly increases the optical path, allowing the laser to fully contact and absorb with the mixed gas to be detected in the reflection tube 101. Subsequently, the photoelectric detector in the optical testing device body 4 performs corresponding visual detection of the attenuation degree of the reflected light wave, and the concentration of hydrogen can be smoothly determined.

[0026] In summary, the present invention constructs a complete gas pretreatment and optical path enhancement system by sequentially arranging a mixing component 5, a buffer component 6, a deceleration component 7 and a reflection component 10 in the detection pipe body 2, and combining the optical control means of the DOE beam splitter 8 and the concave lens 9; the system first solves the problem of uneven hydrogen distribution through the mixing component 5, and then reduces the gas flow rate and prolongs the contact time through the buffer and deceleration component 7, and finally significantly prolongs the optical path through the optical component to enhance the detection signal; thereby effectively solving the existing problem of complex gas composition, uneven hydrogen distribution, excessive flow rate and limited optical path when detecting hydrogen using tunable laser absorption spectroscopy technology, which will reduce the sensitivity, accuracy and overall performance of detection.

[0027] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0028] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hydrogen concentration detection device, comprising a detection platform (1), on which an optical testing device body (4) is arranged, characterized in that: A detection pipe body (2) having one end connected to an optical testing device body (4) is provided on the detection table (1); after the gas to be detected enters the detection pipe body (2), it is optically detected by the optical testing device body (4); a docking joint (3), a mixing component (5), a buffer component (6), a deceleration component (7), and a reflection component (10) are sequentially provided in the detection pipe body (2) along the direction in which the gas enters; The mixing assembly (5) includes a gas collecting hood and a stirring fan. After the gas to be detected enters the detection pipe body (2) through the docking joint (3), it is accelerated by the gas collecting hood and then drives the stirring fan to rotate to achieve mixing of the gas to be detected. The buffer assembly (6) comprises a first buffer disk (61) and a second buffer disk (69) connected via an elastic telescopic structure, and the accelerated gas to be detected is buffered and decelerated by the first buffer disk (61) and the second buffer disk (69); The reflection assembly (10) comprises a reflection tube (101) provided inside the detection pipe body (2) and having a reflective coating, a reflection disk (102) provided in the reflection tube (101) adjacent to the deceleration assembly (7), and a detection laser emitted by the optical testing device body (4) undergoes multiple reflections through the reflection tube (101) and the reflection disk (102) to increase the optical path.

2. The hydrogen concentration detection device according to claim 1, characterized in that: The detection pipe body (2) is provided with a docking joint (3) for communicating with the pipe to be detected at one end away from the optical testing device body (4), and the mixing assembly (5) includes a rotating rod (53) perpendicular to the axial direction of the detection pipe body (2), and the upper and lower ends of the rotating rod (53) are respectively fixed with a first stirring fan (52) and a second stirring fan (54), and the docking joint (3) is provided with a first gas collecting hood (51) and a second gas collecting hood (55) connected to the detection pipe body (2), and the air outlets of the first gas collecting hood (51) and the second gas collecting hood (55) are respectively arranged on one side of the first stirring fan (52) and the second stirring fan (54), and the mixing assembly (5) also includes a connecting rod (56), and the middle position of the rotating rod (53) is rotatably connected to one end of the connecting rod (56), and the other end of the connecting rod (56) is fixed on the first buffer disk (61).

3. The hydrogen concentration detection device according to claim 2, characterized in that: The first air gathering hood (51) and the second air gathering hood (55) are in a conical structure, and the narrower air outlets of the conical structures of the first air gathering hood (51) and the second air gathering hood (55) are arranged adjacent to the stirring fan.

4. The hydrogen concentration detection device according to claim 3, characterized in that: The first gas gathering hood (51) and the second gas gathering hood (55) are arranged diagonally, so that the first stirring fan (52) and the second stirring fan (54) rotate in opposite directions.

5. The hydrogen concentration detection device according to claim 1, characterized in that: The elastic telescopic structure includes a buffer box (62) symmetrically arranged in the detection pipe body (2), a sliding cavity (63) is opened in the buffer box (62) along the axial direction of the detection pipe body (2), a slider (64) is slidably arranged in the sliding cavity (63), a buffer spring (66) is arranged in the sliding cavity (63), the slider (64) is slidably connected in the sliding cavity (63) through the buffer spring (66), a sliding rod (65) is arranged on the slider (64), one end of the sliding rod (65) is fixedly connected to the slider (64), and the other end is fixedly connected to the first buffer disk (61).

6. The hydrogen concentration detection device according to claim 5, characterized in that: A mounting rod (67) is fixedly provided on a side of the first buffer disk (61) away from the connecting rod (56), and the second buffer disk (69) is fixedly provided on the mounting rod (67). A first mounting ring (68) is fixedly provided in the detection pipe body (2), and the first mounting ring (68) and the second buffer disk (69) are fitted together to form a sealing structure.

7. The hydrogen concentration detection device according to claim 6, characterized in that: The second buffer disk (69) has a truncated cone structure, and the first mounting ring (68) has an inwardly concave structure adapted to the structure of the second buffer disk (69).

8. The hydrogen concentration detection device according to claim 1, characterized in that: The deceleration assembly (7) comprises a second mounting ring (71) fixedly mounted in the detection pipe body (2), a flow opening being provided at the center of the second mounting ring (71), a plurality of windshield strips (72) for secondary deceleration of the gas being circumferentially arranged in the flow opening, and the plurality of windshield strips (72) are arranged in a staggered arrangement.

9. The hydrogen concentration detection device according to claim 1, characterized in that: A DOE beam splitter (8) is provided in the detection pipe body (2) adjacent to the emission end of the optical test device body (4), and a concave lens (9) is provided in the detection pipe body (2) on a side of the DOE beam splitter (8) away from the optical test device body (4).

10. The hydrogen concentration detection device according to claim 9, characterized in that: The reflective disk (102) is positioned adjacent to the deceleration assembly (7), and the deflection angle formed by the laser reflected onto the reflective disk (102) is symmetrical to the deflection angle of the laser refracted by the concave lens (9).

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