Combustible gas leak detection device

Abstract

The utility model discloses a combustible gas leakage detection device relates to gas safety monitoring equipment technical field, solved the combustible gas leakage detection of prior art cannot realize long -distance, many -sided gas scanning detection problem. The utility model discloses a handle storehouse, be equipped with processing unit in handle storehouse, and handle storehouse one end is equipped with the holder, and is connected with the collection storehouse through holder, the collection storehouse is parallelly arranged with laser radar scanner and image collector in, processing unit electric connection all with laser radar scanner and image collector, be equipped with scanning window with laser radar scanner and image collector corresponding on the collection storehouse. Through setting holder can support and adjust the attitude of collection storehouse, and then adjust the scanning direction of laser radar scanner and image collector, to realize the scanning of many -sided, and the inspection efficiency is improved greatly. Utilize laser radar scanner can realize the concentration and distance data in scanning range to gather.

Description

Technical Field

[0001] This utility model relates to the technical field of gas safety monitoring equipment, and in particular to a combustible gas leak detection device. Background Technology

[0002] Currently, the detection of combustible gas leaks mainly relies on technologies such as point contact detection, open path detection, and handheld infrared imagers (OGI). However, these technologies have many shortcomings in practical applications: 1. Point-contact detection uses catalytic combustion or electrochemical sensors, which require close contact with the leak point. The response speed is slow, and it cannot achieve rapid screening over long distances and large areas. In addition, the sensors are susceptible to poisoning and have a limited lifespan.

[0003] 2. Open path detection, such as non-dispersive infrared (NDIR) technology, is usually fixed installation or directional detection, which makes it difficult to quickly and comprehensively scan and locate complex environments, and cannot accurately locate the leak source.

[0004] 3. Handheld infrared imagers (OGI) use the absorption of gases by specific infrared bands to create images. Although they can visualize leak points, the equipment is expensive and bulky, and is greatly affected by ambient temperature and target gas concentration. The detection effect is poor in the absence of temperature difference or low concentration conditions, and it cannot provide quantitative or distance information.

[0005] Existing technologies generally suffer from the following drawbacks: First, existing equipment is either a single-point measurement or a fixed-direction path measurement, which cannot simultaneously cover "long distance," "all-round," and "precise positioning," making it difficult to conduct rapid and comprehensive leak detection of complex equipment such as storage tanks, pipeline interfaces, and valve assemblies. Second, the detection efficiency is low, requiring inspection personnel to use handheld equipment to check suspicious points one by one at close range, resulting in high workload and easy omissions. Third, the level of intelligence is low, relying mostly on personnel experience to judge leak points and concentrations, lacking automatic identification, analysis, and early warning capabilities.

[0006] Chinese invention patent CN114858354A discloses a combustible gas micro-leakage detection device and method based on a quantum cascade laser. The device includes a transmitter and a receiver, which correspond to each other. The transmitter includes a quantum cascade laser and a visible light laser. A first MCU drives the quantum cascade laser and the visible light laser to emit laser light through a first control circuit. Both the quantum cascade laser and the visible light laser are connected to an optical path coupling and shaping unit. The receiver includes a photodetector, which is positioned on the optical path of the optical path coupling and shaping unit to emit infrared light. The photodetector is connected to a second MCU through a second control circuit. This invention can detect minute leaks of combustible gas with high sensitivity and selects the "fingerprint" absorption peak of the target gas as the detection wavelength, avoiding cross-interference from other gas components.

[0007] This solution utilizes laser penetration to detect leaked combustible gas by causing absorption, enabling the inspection of minute gas leaks in a fixed optical path direction. It can achieve a certain degree of long-distance scanning, but it lacks multi-directional recognition capabilities. Therefore, there is an urgent need for a new type of detection equipment that can achieve rapid, long-distance, and multi-directional scanning, and intelligently identify and locate the leak source. Utility Model Content

[0008] To address the shortcomings in the aforementioned background technology, this utility model proposes a combustible gas leak detection device, which solves the problem that existing combustible gas leak detection technologies cannot achieve long-distance, multi-directional gas scanning detection.

[0009] The technical solution of this utility model is implemented as follows: A combustible gas leak detection device includes a handle compartment, a processing unit is provided in the handle compartment, a pan-tilt unit is provided at one end of the handle compartment and is connected to a collection compartment through the pan-tilt unit, a laser radar scanner and an image acquisition unit are arranged in parallel in the collection compartment, the laser radar scanner and the image acquisition unit are both electrically connected to the processing unit, and the collection compartment is provided with scanning windows corresponding to the laser radar scanner and the image acquisition unit.

[0010] Preferably, the handle compartment is equipped with a human-machine interface unit, which is electrically connected to the processing unit. The human-machine interface unit includes a display screen, an alarm, and buttons fixedly mounted on the handle compartment, all of which are electrically connected to the processing unit. The alarm is a three-mode alarm (audio, visual, and vibration) used to issue an alarm signal when the gas concentration exceeds the standard.

[0011] Preferably, the lidar scanner includes a laser emitter and a laser receiver fixedly installed in the acquisition chamber, a prism that rotates within the acquisition chamber and is matched with the emission path of the laser emitter, and a drive motor for driving the prism to rotate is provided within the acquisition chamber.

[0012] Preferably, the laser emitter is a tunable diode laser, whose operating wavelength corresponds to the characteristic absorption spectrum of the target combustible gas, and an optical beam expander is integrated on the laser emitter; the laser receiver is a photodetector, and a receiving lens is provided on the laser receiver.

[0013] Preferably, the handle compartment contains a power module for supplying power to the entire device. The rear of the handle compartment has ventilation holes for heat dissipation during operation. The image acquisition device is a high-definition camera for capturing visible light images of the scanning area, and the processing unit is a microcontroller board. A protective lens is fixedly installed at the scanning window.

[0014] The beneficial effects of this utility model are: By setting up a gimbal, the attitude of the data collection chamber can be supported and adjusted, thereby adjusting the scanning direction of the LiDAR scanner and image acquisition unit to achieve multi-directional scanning and significantly improve inspection efficiency. By installing the LiDAR scanner and image acquisition unit inside the collection chamber, the LiDAR scanner can collect concentration and distance data within the scanning range, while the image acquisition unit can collect visible light image data. This allows for remote detection of gas leaks without close contact with the leak source. Furthermore, the handheld design of the handle compartment and the built-in power module ensure the device's portability. The protective lens of the scanning window and the heat dissipation holes at the rear effectively protect core components, reduce environmental interference, and extend the device's lifespan. Overall, it achieves safe, efficient, intelligent, and stable combustible gas leak detection, fully meeting the actual needs of mobile inspections in industrial scenarios. Attached Figure Description

[0015] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the present invention. In the diagram: 1: Handle compartment, 2: Processing unit, 3: Gimbal, 4: Acquisition compartment, 5: LiDAR scanner, 6: Image acquisition unit, 7: Scanning window, 8: Human-computer interaction unit, 9: Laser emitter, 10: Laser receiver, 11: Prism, 12: Optical beam expander, 13: Power module, 14: Heat dissipation hole, 15: Receiving lens. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 , 2As shown in Embodiment 1, a combustible gas leak detection device includes a handle compartment 1, within which a processing unit 2 is located. A pan-tilt unit 3 is mounted at one end of the handle compartment 1 and is connected to a data acquisition compartment 4. A lidar scanner 5 and an image acquisition unit 6 are arranged side-by-side within the data acquisition compartment 4. In this embodiment, the pan-tilt unit 3 is an electrically powered scanning pan-tilt unit capable of horizontal and vertical rotation. The rotation of the pan-tilt unit 3 drives the data acquisition compartment 4 to perform omnidirectional scanning. The image acquisition unit and the lidar scanner 5 are mounted coaxially or adjacent to each other, synchronously acquiring visible light video or images of the scanned area.

[0019] The lidar scanner 5 and the image acquisition unit 6 are both electrically connected to the processing unit 2, and the acquisition chamber 4 is provided with a scanning window 7 corresponding to the lidar scanner 5 and the image acquisition unit 6.

[0020] In a further specific embodiment, the lidar scanner 5 includes a laser emitter 9 and a laser receiver 10 fixedly installed within the acquisition chamber 4. Specifically, in this embodiment, the laser emitter 9 is a tunable diode laser that emits laser light of a specific wavelength, which is set to the characteristic absorption spectrum of the target combustible gas. When passing through the leakage area, the laser echo signal received by the laser receiver changes, thereby enabling the lidar scanner 5 to measure the distance to the measurement point and determine the concentration change along the path. An optical beam expander 12 is integrated on the laser emitter 9 to expand the laser beam. In addition, the laser receiver 10 is a high-sensitivity photodetector, and a receiving lens 15 is integrated on the laser receiver 10 to receive the laser echo signal. A prism 11, which rotatably cooperates with the emission path of the laser emitter 9, is installed inside the acquisition chamber 4, and a drive motor is provided inside the acquisition chamber 4 to drive the rotation of the prism 11. In this embodiment, the drive motor 12 is connected to the prism 11 through a gear pair, which drives the prism 11 to rotate at high speed to form a line laser. At the same time, the gimbal drives the acquisition chamber and the lidar scanner on it to perform pitch motion, converting the line laser into a surface laser, which facilitates omnidirectional scanning.

[0021] In addition, the image acquisition unit 6 is a high-definition camera used to work synchronously with the lidar scanner to acquire visible light images of the scanned area.

[0022] As a further specific implementation, the gimbal 3 adopts a conventional electric gimbal, electrically connected to the processing unit, and can perform horizontal rotation scanning and vertical pitch scanning under its control. In this embodiment, as a feasible solution, the gimbal includes a first drive motor, with a U-shaped frame fixedly mounted at the output end of the first drive motor. The middle part of the U-shaped frame is fixedly connected to the output end of the first drive motor by bolts, so that the first drive motor can drive the U-shaped frame to rotate horizontally. The two open ends of the U-shaped frame are respectively rotatably engaged with the rotating shafts located at both ends of the acquisition chamber. A second drive motor is fixedly mounted on the U-shaped frame, and the second drive motor is engaged with one of the rotating shafts through a gear pair, so that the second drive motor can drive the acquisition chamber to perform vertical pitch movement. The gimbal can drive the laser emitter 9 and the laser receiver 10 to scan within a certain angle range in the horizontal and vertical directions, realizing omnidirectional coverage measurement of the surrounding environment. As an optional solution, both the first drive motor and the second drive motor are equipped with angle sensors, which can respectively feed back the angle signals of the U-shaped frame and the acquisition chamber to the processing unit during the scanning process. The processing unit can record the angle information of each measurement point, the laser echo signal obtained by the laser receiver, and the visible light image information acquired by the corresponding image acquisition device in real time.

[0023] In Example 2, based on Example 1, a human-machine interface unit 8 is provided on the handle compartment 1, and the human-machine interface unit 8 is electrically connected to the processing unit 2. Specifically, in this example, the human-machine interface unit 8 includes a display screen, an alarm, and buttons fixedly mounted on the handle compartment 1, all of which are electrically connected to the processing unit. The alarm is a three-mode alarm with sound, light, and vibration; when the gas concentration exceeds the standard, it can simultaneously emit sound, flashing light, and vibration alarm signals.

[0024] The display screen shows information recorded by the processing unit for the operator to access. When the concentration exceeds the limit at a certain point, the device emits an audible, visual, and vibration alarm. Buttons include standard buttons for operation such as a power button, scan mode switch button, and data storage button. Additionally, there are directional buttons for controlling the scanning direction. When pressed, these buttons transmit signals to the processing unit, controlling the first or second drive motor of the pan-tilt unit to adjust the scanning direction.

[0025] In addition, a power module 13 is installed inside the handle compartment 1. The power module 13 uses a high-energy-density battery to provide continuous power to the entire device and meet the needs of mobile use. Correspondingly, a heat dissipation hole 14 is provided at the rear of the handle compartment 1 for heat dissipation during device operation, to prevent the performance of components from being affected by excessive temperature.

[0026] As a further optional implementation, a protective lens is fixedly provided at the scanning window 7. In this embodiment, the protective lens 15 is made of wear-resistant and high light transmittance materials such as glass, which is used to protect the optical components of the lidar scanner 5 and the image acquisition unit 6, while allowing light to pass through.

[0027] In addition, the processing unit 2 can be a conventional microcontroller board, such as an ARM industrial control motherboard, which can be used to receive the laser echo signal from the laser receiver 10, calculate the gas concentration based on the laser echo signal, and generate the concentration distribution data of each measurement point by combining the angle information of the pan-tilt unit 3.

[0028] The usage process of this embodiment: In a methane leak detection scenario at a chemical plant, the inspection personnel hold this device, stand at a point in the plant area, press the power button to start the equipment, and initiate an all-around scan via button 17. The pan-tilt unit 3 drives the acquisition chamber 4 to begin a 180° horizontal and 30° vertical rotation scan. The laser emitter 9 emits a specific wavelength of laser light, which is refracted by the prism 11 to form a planar laser covering the target area. The laser echo signal is acquired by the laser receiver 10. The processing unit, based on the laser echo data and distance acquired by the laser receiver, and the angles of the pan-tilt unit's joints, calculates the methane concentration and spatial coordinates of each measurement point in real time, generating a three-dimensional concentration distribution model. Simultaneously, the image acquisition unit 6 captures high-definition video and transmits it to the processing unit. In this embodiment, through rotational scanning, the entire visible space can be covered in a single operation, achieving multi-directional scanning, avoiding blind spots of traditional equipment, and improving inspection efficiency several times over. Based on the principle of lidar scanner, it can realize long-distance and non-contact leak detection, ensuring the safety of inspection personnel. At the same time, combined with the ranging function of lidar scanner, it can not only detect leaks, but also accurately calculate the distance and spatial coordinates between the leak point and the equipment, and realize the preliminary quantification of gas concentration.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A combustible gas leak detection device, characterized in that: The device includes a handle compartment (1), which contains a processing unit (2). One end of the handle compartment (1) is equipped with a gimbal (3) and is connected to a data acquisition compartment (4) via the gimbal (3). The data acquisition compartment (4) contains a laser radar scanner (5) and an image acquisition device (6) arranged in parallel. Both the laser radar scanner (5) and the image acquisition device (6) are electrically connected to the processing unit (2). The data acquisition compartment (4) has a scanning window (7) corresponding to the laser radar scanner (5) and the image acquisition device (6).

2. The combustible gas leak detection device according to claim 1, characterized in that: The handle compartment (1) is provided with a human-computer interaction unit (8), which is electrically connected to the processing unit (2).

3. The combustible gas leak detection device according to claim 2, characterized in that: The human-computer interaction unit (8) includes a display screen, an alarm and a button fixedly installed on the handle compartment (1), and the display screen, the alarm and the button are all electrically connected to the processing unit (2).

4. The combustible gas leak detection device according to claim 3, characterized in that: The alarm is a three-mode alarm with sound, light, and vibration.

5. The combustible gas leak detection device according to any one of claims 1 to 4, characterized in that: The laser radar scanner (5) includes a laser emitter (9) and a laser receiver (10) fixedly installed in the acquisition chamber (4). A prism (11) that is matched with the emission path of the laser emitter (9) is rotatably installed in the acquisition chamber (4). A drive motor for driving the prism (11) to rotate is installed in the acquisition chamber (4).

6. The combustible gas leak detection device according to claim 5, characterized in that: The laser emitter (9) is a tunable diode laser, whose operating wavelength corresponds to the characteristic absorption spectrum of the target combustible gas, and an optical beam expander (12) is integrated on the laser emitter (9); the laser receiver (10) is a photodetector, and a receiving lens (15) is provided on the laser receiver (10).

7. The combustible gas leak detection device according to claim 6, characterized in that: The handle compartment (1) is equipped with a power module (13).

8. The combustible gas leak detection device according to claim 7, characterized in that: The handle compartment (1) is provided with a heat dissipation hole (14) at the rear.

9. The combustible gas leak detection device according to claim 8, characterized in that: The image acquisition device (6) is a high-definition camera used to acquire visible light images of the scanning area, and the processing unit (2) is a microcontroller board.

10. The combustible gas leak detection device according to claim 9, characterized in that: A protective lens is fixedly installed at the scanning window (7).

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