A hydrogen concentration detection device

Abstract

The application 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 testing device body arranged on the detection table, a detection pipeline body in communication with one end of the optical testing device body, visual detection of a to-be-detected gas by the optical testing device body after the to-be-detected gas enters the detection pipeline body, a joint, a mixing assembly, a buffer assembly, a speed reduction assembly and a reflection assembly arranged in the detection pipeline body in sequence along a gas entering direction; the mixing assembly, the buffer assembly, the speed reduction assembly and the reflection assembly are arranged in the detection pipeline body in sequence, and the optical testing device body is combined with the optical regulation and control means of a beam splitter and a concave lens, the problem of uneven hydrogen distribution is solved through the mixing assembly, the gas flow rate is reduced and the contact time is prolonged through the buffer and speed reduction assembly, and finally the optical path is significantly prolonged through the optical assembly, and the detection signal is enhanced.

Description

Technical Field

[0001] This invention relates to the field of optical vision detection technology for hydrogen concentration, and more specifically, to a hydrogen concentration detection device. Background Technology

[0002] For certain pipelines, it is necessary to conduct regular inspections to determine whether there is a hydrogen leak. This is done by using an optical testing device (such as TDLAS, a tunable diode laser absorption spectrometer) to emit a laser of the corresponding wavelength, which has characteristic absorption lines of hydrogen molecules at specific wavelengths (such as near-infrared or mid-infrared bands). After passing through the gas being tested, the degree of light intensity attenuation is detected by visual inspection.

[0003] When using an optical testing device to emit specific light waves into a detection pipe to detect hydrogen in a gas, the presence of other gas components in the gas entering the pipe can interfere with the detection accuracy. This detection method relies on the absorption characteristics of hydrogen for specific wavelengths of light; however, when the hydrogen distribution in the gas is sparse or uneven, the sensitivity and accuracy of the detection will be significantly affected. Furthermore, the diffusion process of the gas within the detection pipe needs to be slow and stable. If the gas flow rate is too fast, the effective contact time between the light wave and hydrogen molecules will be reduced, thus affecting the detection efficiency. Simultaneously, the limited optical path length within the detection pipe restricts the distance the light wave can interact with the gas, further limiting detection performance and hindering the achievement of high-precision, high-reliability gas detection results.

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

[0005] To address the issues raised in the background art regarding the reduced sensitivity, accuracy, and overall performance of hydrogen detection using tunable laser absorption spectroscopy, such as complex gas composition, uneven hydrogen distribution, excessively high flow rate, and limited optical path, this invention provides a hydrogen concentration detection device. The device includes a detection platform with an optical testing device body mounted on it. A detection pipe body with one end connected to the optical testing device body is also mounted on the platform. A connector for connecting to a pipe to be tested is located at the end of the detection pipe body furthest from the optical testing device body. The gas to be detected enters the detection pipe body through the connector and is then visually detected by the optical testing device body.

[0006] Since other gases may be present in the gas that directly enters the detection pipeline through the pipeline to be tested, and hydrogen is diffused within the pipeline, the detection method that uses specific light waves to absorb hydrogen through contact is not effective because the hydrogen is not diffused evenly. This will affect the detection of hydrogen leakage and its concentration. This technical solution is to mix the gas to be tested before the hydrogen enters the detection pipeline for detection, so that the hydrogen is in a more uniform state in the mixed gas.

[0007] As a further improvement to this technical solution, a mixing assembly for mixing the gas to be tested is first installed inside the detection pipeline body along the gas inlet direction. The mixing assembly includes a gas-gathering hood and a stirring fan. After the gas to be tested enters the detection pipeline body through the connector, it is accelerated by the gas-gathering hood and then drives the stirring fan to rotate, thereby achieving mixing of the gas to be tested. That is to say, the mixing assembly includes a rotating rod perpendicular to the axial direction of the detection pipeline body. The upper and lower ends of the rotating rod are respectively fixed with a first stirring fan and a second stirring fan. The connector is provided with a first gas-gathering hood and a second stirring fan that are connected to the detection pipeline body. The first and second air-gathering hoods have their air outlets facing one side of the first and second agitating fans, respectively. The mixing assembly also includes a connecting rod, with the rotating rod rotatably connected to one end of the connecting rod at its middle position, and the other end of the connecting rod fixed to the first buffer plate. Notably, the first and second air-gathering hoods have a conical structure, and the narrower air outlets of the conical structures of the first and second air-gathering hoods are positioned close to the agitating fans. Furthermore, the first and second air-gathering hoods are arranged diagonally, causing the first and second agitating fans to rotate in opposite directions.

[0008] Based on this, since the gas velocity is relatively high when it first enters the detection pipeline, the high gas velocity is not conducive to sufficient contact between the laser and the gas to be detected, which will affect the detection efficiency and detection results. Moreover, due to the acceleration by the gas gathering hood, the airflow velocity is further increased. Therefore, it is necessary to decelerate the gas when it enters the detection zone so that it slowly enters the detection zone and contacts and absorbs the laser beam.

[0009] As a further improvement to this technical solution, a buffer assembly and a deceleration assembly are sequentially arranged behind the mixing assembly along the gas entry direction within the detection pipeline body. The buffer assembly includes a first buffer disc and a second buffer disc connected by an elastic telescopic structure. The accelerated gas to be detected is buffered and decelerated by the first and second buffer discs. The elastic telescopic structure includes buffer boxes symmetrically arranged within the detection pipeline body. A sliding cavity is formed within the buffer box along the axial direction of the detection pipeline body. A slider is slidably arranged within the sliding cavity, and a buffer spring is provided within the sliding cavity. The slider is slidably connected to the sliding cavity via the buffer spring. A sliding rod is provided on the slider, with one end fixedly connected to the slider and the other end fixedly connected to the first buffer disc. A mounting rod is fixed to the side of the first buffer disc away from the connecting rod, and the second buffer disc is fixed to the mounting rod. A first mounting ring is fixed within the detection pipeline body, and the first mounting ring forms a sealing structure when it is fitted with the second buffer disc. Furthermore, the second buffer disc has a frustum-shaped structure, and the first mounting ring has a concave structure adapted to the structure of the second buffer disc.

[0010] To allow the gas to disperse into the detection zone, rather than forming a stream of gas;

[0011] As a further improvement to this technical solution, the deceleration assembly includes a second mounting ring fixed in the detection pipeline body. A flow port is provided at the center of the second mounting ring. Several rings of wind deflectors for secondary deceleration of the gas are arranged circumferentially inside the flow port. The rings of wind deflectors are arranged in an alternating pattern.

[0012] In another scheme, the gas to be tested, after being decelerated by the first and second buffer disks, is dispersed by the wind deflector and slowly enters the detection zone for detection. However, since the detection laser emitted by the optical testing device body has a limited optical path within the limited detection zone, it will affect the contact and absorption between the laser and the gas to be tested, which is not conducive to improving detection efficiency and detection results.

[0013] As a further improvement to this technical solution, a detection zone reflection component is provided behind the deceleration component. Secondly, since the laser emitted by the optical testing device body is a single beam and is oriented in the same direction as the detection pipe body, it is not conducive to increasing the optical path within the detection zone. Therefore, a DOE beam splitter is provided inside the detection pipe body near the emitting end of the optical testing device body, and a concave lens is provided inside the detection pipe body on the side of the DOE beam splitter away from the optical testing device body. The reflection component includes a reflective tube with a reflective coating disposed inside the tangential part of the detection pipe body. A reflective disk is provided inside the reflective tube near the deceleration component. The detection laser emitted by the optical testing device body undergoes multiple reflections through the reflective tube and reflective disk to increase the optical path. The reflective disk is positioned near the deceleration component, and the deflection angle formed by the laser reflected onto the reflective disk is symmetrically set with respect to the laser deflection angle refracted by the concave lens.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In this hydrogen concentration detection device, uniform gas mixing is achieved, solving the problem of hydrogen dispersion. Through the conical acceleration structure of the first and second gas-gathering hoods, the airflow is directionally injected to the first and second stirring fans. Due to the diagonal layout of the gas-gathering hoods, the double fan blades rotate in opposite directions to form an upward and downward opposing vortex, which forces convection mixing to achieve uniform molecular distribution of hydrogen in the mixing range, eliminates the concentration gradient caused by background gas interference, and improves the recognition accuracy of TDLAS for characteristic absorption peaks.

[0016] 2. In this hydrogen concentration detection device, a three-stage coordinated deceleration is achieved to optimize the interaction time between light and gas. The high-speed airflow impacts the first and second buffer disks, and the kinetic energy is absorbed by the buffer spring and the damping slide cavity. The frustum-shaped structure of the second buffer disk and the concave sealing surface of the first mounting ring form a turbulent dissipation channel, and the kinetic energy is attenuated in a stepwise manner, reducing the gas velocity to a laminar state, prolonging the interaction time between hydrogen molecules and the laser, and meeting the absorption kinetic requirements. Secondly, turbulent flow dispersion and deceleration are achieved. The escaping gas is cut by the staggered wind deflector strips to form a dispersed micro-airflow. The airflow dispersion avoids local high-speed flow and ensures that the gas enters the detection area at a uniform low speed, eliminating absorption signal jitter caused by flow velocity fluctuations.

[0017] 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 by a concave lens, the incident angle shifts, increasing the spatial sampling density and avoiding missed detections caused by local hydrogen concentration fluctuations. Second, a closed-loop reflection optical path is used, where the refracted light forms a V-shaped reflection chain between the reflector coating and the reflector disk. The deflection angle of the reflector disk is symmetrical to the refraction angle of the concave lens, forming a self-closed-loop optical path, effectively multiplying the optical path. This helps to extend the propagation path of the laser within the detection range, increasing the interaction distance and time between the light wave and hydrogen molecules, thereby enhancing the intensity of the absorbed signal and improving the detection resolution. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the detection pipeline body of the present invention;

[0020] Figure 3 This is a front view of the cross-sectional structure of the reflector tube of the present invention;

[0021] Figure 4 This is a cross-sectional view of the reflector tube of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the buffer component of the present invention;

[0023] Figure 6 This is a schematic diagram of the deceleration assembly of the present invention;

[0024] Figure 7 This is a schematic diagram of the beam reflection state inside the reflector tube of the present invention.

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1. Testing platform; 2. Pipe body for testing; 3. Connector; 4. Optical testing device body; 5. Mixing assembly; 6. Buffer assembly; 7. Deceleration assembly; 8. DOE beam splitter; 9. Concave lens; 10. Reflection assembly;

[0027] 51. First gas-gathering shroud; 52. First agitator; 53. Rotating rod; 54. Second agitator; 55. Second gas-gathering shroud; 56. Connecting rod;

[0028] 61. First buffer plate; 62. Buffer box; 63. Slide cavity; 64. Slider; 65. Slide rod; 66. Buffer spring; 67. Mounting rod; 68. First mounting ring; 69. Second buffer plate;

[0029] 71. Second mounting ring; 72. Wind deflector strip;

[0030] 101. Reflector tube; 102. Reflector disk. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Existing methods for detecting hydrogen using tunable laser absorption spectroscopy suffer from reduced sensitivity, accuracy, and overall performance due to factors such as complex gas composition, uneven hydrogen distribution, excessively high flow rate, and limited optical path.

[0033] Therefore, the present invention provides a hydrogen concentration detection device, see [link to relevant documentation]. Figure 1 As shown, it includes a testing platform 1, an optical testing device body 4 is provided on the testing platform 1, and a testing pipe body 2 is provided on the testing platform 1 with one end connected to the optical testing device body 4. The end of the testing pipe body 2 away from the optical testing device body 4 is provided with a connector 3 for connecting with the pipe to be tested. After the gas to be tested is connected to the testing pipe body 2 through the connector 3, it enters the testing pipe body 2 and is then visually inspected by the optical testing device body 4.

[0034] It should be noted that the optical testing device body 4 in this invention includes a laser emitter and a photodetector. That is, the laser emitter emits a specific light wave that is absorbed by hydrogen gas, and the photodetector detects the degree of light intensity attenuation, converting the light signal into a current signal. The absorption characteristics are then extracted by a lock-in amplifier to achieve visual presentation. As for the photodetector, it belongs to existing mature technologies, such as InGaAs photodiodes, germanium detectors, or photomultiplier tubes. At the same time, there are practical applications of products such as the Tiger Optics HALO H2 gas trace hydrogen analyzer and the JNYQ-O-15 laser gas analyzer.

[0035] For details, see Figures 2-4 As shown, since other gases may be present in the gas that directly enters the detection pipe body 2 through the pipe to be detected, and hydrogen is diffused in the pipe, the detection method of contact absorption by specific light waves with hydrogen will affect the detection of hydrogen leakage and its concentration because the hydrogen is not diffused evenly. 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 more uniform state in the mixed gas. Specifically, a mixing component 5 for mixing the gas to be detected is first set in the detection pipe body 2 along the gas entry direction.

[0036] The mixing component 5 includes a gas-gathering hood and a stirring fan. After the gas to be tested enters the detection pipeline body 2 through the connector 3, it is accelerated by the gas-gathering hood and then drives the stirring fan to rotate, thereby mixing the gas to be tested. That is, the mixing component 5 includes a rotating rod 53 perpendicular to the axial direction of the detection pipeline body 2. 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 connector 3 is provided with a first gas-gathering hood 51 and a second gas-gathering hood 55 that are connected to the detection pipeline body 2. The air outlets of the first gas-gathering hood 51 and the second gas-gathering hood 55 are respectively facing... The first agitator 52 and the second agitator 54 are disposed on one side. The mixing assembly 5 also includes a connecting rod 56. The rotating rod 53 is rotatably connected to one end of the connecting rod 56 at the middle position, and the other end of the connecting rod 56 is fixed to the first buffer plate 61. It is worth mentioning that the first gas gathering hood 51 and the second gas gathering hood 55 have a conical structure, and the narrower air outlets of the conical structures of the first gas gathering hood 51 and the second gas gathering hood 55 are disposed near the agitator. Furthermore, the first gas gathering hood 51 and the second gas gathering hood 55 are arranged diagonally, which causes the first agitator 52 and the second agitator 54 to rotate in opposite directions.

[0037] During operation, after the pipeline to be tested is connected to the pipeline body 2 via connector 3, gas begins to enter through connector 3. Inside the pipeline, after passing through the first gas-gathering hood 51 and the second gas-gathering hood 55, the airflow is accelerated due to the conical structure of the first and second gas-gathering hoods 51 and 55. The accelerated gas to be tested is then blown towards the first agitator fan 52 and the second agitator fan 54. Since the first and second gas-gathering hoods 51 and 55 are diagonally arranged, the gas blown by the first and second gas-gathering hoods 51 and 55 towards the corresponding first and second agitator fans 52 and 54 will cause the first and second agitator fans 52 and 54 to move in opposite directions. The rotation of the first agitator 52 and the second agitator 54 causes the gas entering the detection pipe body 2 to mix, so that the hydrogen in the gas to be detected is no longer in a diffuse state, but is dispersed throughout the gas to be detected, which facilitates subsequent detection. The first agitator 52 and the second agitator 54 rotate in opposite directions, which causes the upper and lower sections of the gas to be detected in the mixing zone to form vortices in opposite directions. When the two vortices collide, the agitation intensity increases, which means that the gas to be detected in the entire mixing component 5 can be mixed more thoroughly, thus laying the groundwork for subsequent detection.

[0038] Further, see Figures 4-6As shown, the gas velocity is relatively high when it first enters the detection pipe body 2. This high velocity is detrimental to the sufficient contact between the laser and the gas to be detected, thus affecting detection efficiency and results. Furthermore, the gas velocity is further increased by the acceleration through the gas-gathering hood. Therefore, it is necessary to decelerate the gas as it enters the detection zone, allowing it to slowly enter and contact the laser beam for absorption. Therefore, this invention employs a buffer assembly 6 and a deceleration assembly 7 sequentially arranged within the detection pipe body 2, following the gas entry direction and located behind the mixing assembly 5. The buffer assembly 6 includes components that are elastically telescopic... The first buffer disk 61 and the second buffer disk 69 are connected. The accelerated gas to be detected is buffered and decelerated by the first buffer disk 61 and the second buffer disk 69. 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.

[0039] It is worth mentioning that a mounting rod 67 is fixed on the side of the first buffer plate 61 away from the connecting rod 56, and the second buffer plate 69 is fixed on the mounting rod 67. A first mounting ring 68 is fixed inside the detection pipe body 2. The first mounting ring 68 and the second buffer plate 69 fit together to form a sealing structure. Secondly, the second buffer plate 69 has a frustum-shaped structure, and the first mounting ring 68 has a concave structure that matches the structure of the second buffer plate 69.

[0040] After the first buffer plate 61 and the second buffer plate 69 perform double deceleration, the gas undergoes a third deceleration through the deceleration assembly 7. This deceleration is intended to disperse the gas into the detection zone rather than forming a stream of gas. Specifically, the deceleration assembly 7 includes a second mounting ring 71 fixed inside the detection pipeline body 2. The second mounting ring 71 has a flow port at its center, and several rings of baffle strips 72 are arranged circumferentially inside the flow port to perform secondary deceleration on the gas. The rings of baffle strips 72 are arranged in an alternating pattern.

[0041] During operation, the gas to be tested, after being mixed by the first agitator 52 and the second agitator 54, enters the buffer zone. It first passes through the first buffer plate 61, which acts as a first barrier. This barrier causes some of the gas to return to the vicinity of the first and second agitators 52 and 54 to continue mixing, further increasing the mixing. The escaped gas then impacts the second buffer plate 69, which forms a second barrier. Under the influence of the first and second buffer plates 61 and 69, and with the increase in the amount of gas to be tested in the mixing zone, the impact propagates deeper into the detection pipe body 2. The first and second buffer plates 61 and 69 are buffered by the slider 64 and the buffer spring 66, while a damping layer is provided inside the sliding cavity 63. The first mounting ring 68 absorbs and accelerates the kinetic energy of the gas to be tested after it is mixed with the first buffer plate 61 and the second buffer plate 69. When the gas rushes towards the first buffer plate 61 and the second buffer plate 69, most of the kinetic energy is absorbed instantly, allowing the gas to escape slowly. The concave and frustum-shaped structure of the first mounting ring 68 and the second buffer plate 69 can play a good sealing role when the gas rushes out instantly, allowing the slider 64 and the buffer spring 66 to better exert their buffering effect. Secondly, the gas that escapes afterward will first impact the inner wall of the detection pipe body 2 through the wedge-shaped inclined surface around the second buffer plate 69, which will further reduce the kinetic energy of the gas. Therefore, the first mounting ring 68 and the second buffer plate 69 can play a better sealing role, exert a buffering effect, and reduce the kinetic energy of the gas after it escapes by hitting the inner wall of the detection pipe body 2.

[0042] When the gas that finally escapes through the wedge-shaped ramps around the second buffer plate 69 enters the deceleration zone, the kinetic energy of the gas entering here is already very small. However, if the gas forms streams of air, the speed will still be relatively fast. Therefore, after passing through several staggered wind deflectors 72 at the flow port, the airflow will be dispersed by the wind deflectors 72, allowing the mixed airflow to gradually enter the detection zone in a dispersed manner, which is convenient for subsequent detection.

[0043] Furthermore, see Figure 3 , Figure 4 and Figure 7As shown, the gas to be tested, after being decelerated by the first buffer disk 61 and the second buffer disk 69, is dispersed by the baffle strip 72 and slowly enters the detection zone for testing. However, since the detection laser emitted by the optical testing device body 4 has a limited optical path within the limited detection zone, this affects the contact and absorption between the laser and the gas to be tested, which is not conducive to improving detection efficiency and detection results. Therefore, this invention uses a detection zone 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 direction as the axis of the detection pipe body 2, it does not... To facilitate increasing the optical path within the detection range, a DOE beam splitter 8 is installed at the emitting end of the detection pipe body 2 near the optical testing device body 4, and a concave lens 9 is installed on the side of the detection pipe body 2 away from the DOE beam splitter 8. The reflection component 10 includes a reflection tube 101 with a reflective coating installed inside the detection pipe body 2, and a reflection disk 102 is installed inside the reflection tube 101 near the deceleration component 7. The detection laser emitted by the optical testing device body 4 is reflected multiple times by the reflection tube 101 and the reflection disk 102 to increase the optical path.

[0044] It is worth mentioning that the reflector 102 is positioned close to the deceleration assembly 7, and the deflection angle formed by the laser reflected onto the reflector 102 is symmetrically set with respect to the laser deflection angle refracted by the concave lens 9.

[0045] At work, such as Figure 7 As shown, after the gas decelerates in the deceleration zone, it disperses and diffuses into the monitoring zone. First, it is blocked by the reflector 102, which further obstructs the gas. Finally, the gas gradually enters the reflector tube 101 through the periphery of the reflector 102, where it begins to absorb and detect the internal laser. The laser emitted by the optical testing device body 4 is first split into several equal beams by the DOE beam splitter 8. The DOE beam splitter 8 is a mature existing technology and will not be elaborated upon here. This transforms the original single-beam laser into multiple parallel laser beams. Then, after refraction by the concave lens 9, the laser beam, originally parallel to the axis of the reflector 102, begins to be emitted towards the inner wall of the reflector 102. Thus, the laser beam originally parallel to the axis of the reflector 102, along with the reflector 102, only reflects back and forth parallel to the axis of the reflector 102. After refraction by the concave lens 9, it appears as... Figure 7The reflection pattern shown greatly increases the optical path, allowing the laser to fully contact and absorb the gas, facilitating subsequent visual detection of the light wave attenuation. Specifically, the laser is refracted by the concave lens 9 onto the inner wall of the reflector tube 101, and then continues to reflect, forming a V-shaped path. When it reaches the reflector disk 102, its reflection angle is symmetrical to the deflection angle of the laser when it is refracted from the concave lens 9. Thus, the laser is reflected back to the reflector tube 101 through the reflector disk 102, forming a VB-shaped path and reflecting back again. This back-and-forth process greatly increases the optical path, allowing the laser to fully contact and absorb the mixed gas to be tested within the reflector tube 101. Subsequently, the photodetector in the optical testing device body 4 performs corresponding visual detection of the attenuation of the reflected light wave, thus successfully determining the concentration of hydrogen.

[0046] In summary, this 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 this with optical control methods using a DOE beam splitter 8 and a concave lens 9. This system first solves the problem of uneven hydrogen distribution through the mixing component 5, then reduces the gas flow rate and extends the contact time through the buffer and deceleration components 7, and finally significantly extends the optical path and enhances the detection signal through the optical components. Thus, it effectively solves the problems of reduced detection sensitivity, accuracy, and overall performance caused by factors such as complex gas composition, uneven hydrogen distribution, excessively high flow rate, and limited optical path when using tunable laser absorption spectroscopy to detect hydrogen.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydrogen concentration detection device, comprising a detection stage (1), wherein an optical testing device body (4) is disposed on the detection stage (1), characterized in that: The detection platform (1) is provided with a detection pipeline body (2) that is connected to the optical testing device body (4) at one end. After the gas to be detected enters the detection pipeline body (2), it is optically detected by the optical testing device body (4). The detection pipeline body (2) is provided with a connector (3), a mixing component (5), a buffer component (6), a deceleration component (7), and a reflection component (10) in sequence along the gas entry direction. The mixing component (5) includes a gas-gathering hood and a stirring fan. After the gas to be tested enters the detection pipeline body (2) through the connector (3), it is accelerated by the gas-gathering hood and then drives the stirring fan to rotate to achieve mixing of the gas to be tested. The buffer assembly (6) includes a first buffer disk (61) and a second buffer disk (69) connected by an elastic telescopic structure. The accelerated gas to be detected is buffered and decelerated by the first buffer disk (61) and the second buffer disk (69). The reflective assembly (10) includes a reflective tube (101) with a reflective coating inside the detection pipe body (2). A reflective disk (102) is provided inside the reflective tube (101) near the deceleration assembly (7). The detection laser emitted by the optical testing device body (4) is reflected multiple times by the reflective tube (101) and the reflective disk (102) to increase the optical path. The detection pipe body (2) is provided with a connector (3) for communicating with the pipe to be tested at one end away from the optical testing device body (4). The mixing component (5) includes a rotating rod (53) perpendicular to the axis of the detection pipe body (2). 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 connector (3) is provided with a first gas gathering hood (51) and a second gas gathering hood (55) connected to the detection pipe body (2). The air outlets of the first gas gathering hood (51) and the second gas gathering hood (55) are respectively set on one side facing the first stirring fan (52) and the second stirring fan (54). The mixing component (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). The other end of the connecting rod (56) is fixed on the first buffer plate (61). The first gas-gathering hood (51) and the second gas-gathering hood (55) are conical in shape, and the narrower air outlets of the conical structures of the first gas-gathering hood (51) and the second gas-gathering hood (55) are located near the agitator fan. The first gas-gathering hood (51) and the second gas-gathering hood (55) are arranged diagonally, causing the first agitator (52) and the second agitator (54) to rotate in opposite directions.

2. The hydrogen concentration detection device according to claim 1, characterized in that: The elastic telescopic structure includes a buffer box (62) symmetrically arranged inside the detection pipe body (2). A sliding cavity (63) is provided 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 provided 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 provided 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 plate (61).

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

4. The hydrogen concentration detection device according to claim 3, characterized in that: The second buffer disk (69) has a frustum-shaped structure, and the first mounting ring (68) has a concave structure that is compatible with the structure of the second buffer disk (69).

5. The hydrogen concentration detection device according to claim 1, characterized in that: The deceleration assembly (7) includes a second mounting ring (71) fixed inside the detection pipeline body (2). The second mounting ring (71) has a flow port at its center. Several rings of wind deflectors (72) for secondary deceleration of the gas are arranged circumferentially inside the flow port. The rings of wind deflectors (72) are arranged in an alternating pattern.

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

7. The hydrogen concentration detection device according to claim 6, characterized in that: The reflector (102) is positioned close to the deceleration assembly (7), and the deflection angle formed by the laser reflected onto the reflector (102) is symmetrically set with respect to the laser deflection angle refracted by the concave lens (9).

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