Combustible gas detector
By integrating key components of the laser detector onto the motherboard, the production process is simplified, manufacturing costs are reduced, and testing accuracy is improved, thus solving the problem of high costs caused by the complex structure of existing laser detectors.
Patent Information
- Application Number
- CN202423245357.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing laser detectors have complex structures and complicated manufacturing processes, resulting in high manufacturing costs.
The integrated design integrates the sensor control unit, sensor signal processing unit, main control unit, laser emitting component and laser receiving component on the motherboard, simplifying the production process and reducing the number of components used.
It reduced production costs, improved the accuracy and efficiency of calibration testing, simplified the production process, and lowered the overall price of laser sensors.
Smart Images
Figure CN223827558U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of combustible gas detection technology, specifically relating to a combustible gas detector. Background Technology
[0002] In recent years, with increased public awareness of gas safety, the use of household gas detectors has become increasingly common. There are many types of household gas detectors, among which laser detectors are widely used in daily life due to their numerous advantages. Laser detectors employ a unique non-contact detection principle, unaffected by various gases, achieving truly zero false alarms. The internal photoelectric chip is hermetically sealed, unaffected by external environmental interference. Laser detectors have a long service life, depending on the laser inside, which has a lifespan of over 10 years, far exceeding the lifespan of semiconductor and catalytic sensors. Furthermore, based on optical principles and employing special algorithms, laser sensors can detect gas concentrations at the ppb (parts per billion) level. The entire detection process is green and safe, without chemical reactions, and produces no excess gas or substances.
[0003] Existing laser detectors mainly consist of a housing and a main board and laser sensor housed inside the housing. The laser sensor includes a transmitting component, a receiving component, a mounting bracket, and a control board. The transmitting and receiving components are mounted on the mounting bracket, which is connected to the main board. The control board is a printed circuit board containing the laser sensor's control unit and signal processing unit. During assembly, the transmitting and receiving components are connected to the control board via soldering and adhesive bonding; the control board is connected to the main board via soldering. Due to the complex internal structure and numerous components of the laser detector, its manufacturing process is cumbersome and its manufacturing cost is high.
[0004] Therefore, there is an urgent need to propose a combustible gas detector and combustible gas detection system to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a combustible gas detector with a simple structure that simplifies manufacturing processes and reduces production costs. This purpose is achieved through the following technical solution:
[0006] The first aspect of this utility model provides a combustible gas detector, comprising:
[0007] A housing, wherein an air inlet is provided on the housing, and the interior of the housing is connected to the external environment through the air inlet;
[0008] The motherboard is disposed inside the housing. The motherboard is provided with a main control unit, a sensor control unit and a sensor signal processing unit. The sensor signal processing unit and the sensor control unit are signal connected, and the sensor control unit and the main control unit are signal connected.
[0009] A laser emitting component is connected to the motherboard and is signal-connected to the sensing and control unit. The sensing and control unit is used to control the laser emitting component to emit laser light.
[0010] A laser receiving component is connected to the motherboard and is signal-connected to the sensing signal processing unit. The laser receiving component is used to receive the laser emitted by the laser emitting component.
[0011] This combustible gas detector employs a superior integrated design, integrating the sensor control unit, sensor signal processing unit, main control unit, laser emitting component, and laser receiving component onto the motherboard. This unification of the sensor control unit, sensor signal processing unit, and main control unit provides greater flexibility for algorithm optimization. During testing, only a single calibration test of the entire device is required, eliminating the need for separate calibration tests of the laser sensor as in existing technologies. This not only saves labor and time costs but also makes the calibration test results more accurate and closer to real-world application scenarios. Furthermore, this integrated design maximizes the reuse of similar functional units. The original laser sensor control unit and sensor signal processing unit can be ported to the motherboard, eliminating the need for a traditional laser sensor control board. The laser emitting component and laser receiving component are directly connected to the motherboard, significantly reducing the number of components and lowering the structural complexity of the combustible gas detector. Because there is no internal laser sensor control board, the structure of the combustible gas detector is no longer limited by the location requirements of the laser sensor control board. The laser emitting and receiving components can be flexibly installed in suitable positions on the mainboard, optimizing the overall layout of the combustible gas detector and making the gas passage more unobstructed. Understandably, this structural simplification greatly simplifies the production process, eliminating the need for laser sensor control board fabrication, assembly, testing, and calibration, thus saving on laser sensor manufacturing costs and consequently reducing the factory cost. By integrating the laser emitting and receiving components into the mainboard, laser sensor manufacturers only need to focus on the research of the more technologically advanced transmitters and receivers, without needing to worry about the overall design. This specialization will inevitably further reduce the price of transmitters and receivers, meaning the price of combustible gas detectors will also decrease. While the mainboard adds some peripheral circuitry, these are conventional circuits and do not significantly increase costs.
[0012] In addition, the combustible gas detector of this utility model may also have the following additional technical features:
[0013] In some embodiments of this utility model, the laser emitting assembly includes an emitter and an emitting board, the emitting board is signal-connected to the sensing and control unit, the emitter is disposed on the emitting board and signal-connected to the emitting board, and the emitting board is connected to the motherboard.
[0014] In some embodiments of this utility model, the transmitter plate and the motherboard are soldered together.
[0015] In some embodiments of this utility model, the laser receiving assembly includes a receiver and a receiving board. The receiving board is connected to the signal processing unit, the receiver is disposed on the receiving board and is signal-connected to the receiving board, and the receiving board is connected to the main board.
[0016] In some embodiments of this utility model, the receiving board and the main board are soldered together.
[0017] In some embodiments of this invention, the laser emitting component and the laser receiving component are arranged opposite each other along any direction of the motherboard.
[0018] In some embodiments of this utility model, the laser emitting component and the laser receiving component are embedded in the motherboard, and the motherboard has a groove extending along the laser transmission path, with both the laser emitting component and the laser receiving component recessed into the interior of the groove.
[0019] In some embodiments of this utility model, a reflector is provided on the motherboard, and the laser emitted by the laser emitting assembly is reflected by the reflector to the laser receiving assembly.
[0020] In some embodiments of this utility model, the reflector includes a first reflective surface and a second reflective surface. The first reflective surface and the laser emitting component are disposed opposite to each other, and the second reflective surface and the laser receiving component are disposed opposite to each other. The laser emitted by the laser emitting component is emitted to the first reflective surface, reflected by the first reflective surface to the second reflective surface, and then reflected by the second reflective surface to the laser receiving component.
[0021] In some embodiments of this utility model, the laser emitting component and the laser receiving component are symmetrically arranged about a first direction, and the first reflecting surface and the second reflecting surface are symmetrically arranged about the first direction. Attached Figure Description
[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0023] Figure 1 A schematic diagram of the structure of a combustible gas detector according to an embodiment of the present invention is shown.
[0024] Figure 2 A schematic diagram of a combustible gas detector according to an embodiment of the present invention is shown.
[0025] Figure 3 A partial structural diagram of a combustible gas detector (laser emitting component and laser receiving component arranged in a certain direction) according to an embodiment of the present invention is shown schematically.
[0026] Figure 4 A partial structural schematic diagram of a combustible gas detector (laser emitting component and laser receiving component arranged in another direction) according to an embodiment of the present invention is shown.
[0027] Figure 5 A partial structural diagram of a combustible gas detector (with a groove on the main board) according to an embodiment of the present invention is shown schematically.
[0028] Figure 6 A partial structural diagram of a combustible gas detector (with a reflector mounted on the main board) according to an embodiment of the present invention is shown schematically.
[0029] The labels in the attached diagram are as follows:
[0030] 100. Housing; 110. Front housing; 111. Air intake; 120. Rear cover;
[0031] 200, Mainboard; 210, Groove; 300, Main Control Unit; 400, Sensor Control Unit; 500, Sensor Signal Processing Unit; 600, Laser Emitting Assembly; 610, Transmitter; 620, Emitting Board; 700, Laser Receiving Assembly; 710, Receiver; 720, Receiving Board; 800, Reflector; 810, First Reflecting Surface; 820, Second Reflecting Surface; 830, Connecting Part; 900, Linkage Unit; 1000, Power Supply Unit; 1010, Power Socket; 1100, Audio-Visual Unit; 1200, Communication Unit. Detailed Implementation
[0032] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0033] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.
[0034] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0035] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.
[0036] Figure 1A schematic diagram of the structure of a combustible gas detector according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of a combustible gas detector according to an embodiment of the present invention is shown. Figure 1 and Figure 2 As shown, this utility model proposes a combustible gas detector, including a housing 100, a main board 200, a laser emitting component 600, and a laser receiving component 700. The housing 100 is provided with an air inlet 111, and the interior of the housing 100 is connected to the external environment through the air inlet 111. The main board 200 is located inside the housing 100 and includes a main control unit 300, a sensor control unit 400, and a sensor signal processing unit 500. The sensor signal processing unit 500 and the sensor control unit 400 are signal-connected, and the sensor control unit 400 and the main control unit 300 are signal-connected. The laser emitting component 600 is connected to the main board 200 and is signal-connected to the sensor control unit 400. The sensor control unit 400 is used to control the laser emitting component 600 to emit laser light. The laser receiving component 700 is connected to the main board 200 and is signal-connected to the sensor signal processing unit 500. The laser receiving component 700 is used to receive the laser light emitted by the laser emitting component 600.
[0037] When the combustible gas detector is powered on and starts working, the sensor control unit 400 on the main board 200 controls the laser emitting component 600 to send laser signals according to certain rules. When combustible gas enters the interior of the housing 100 from the air inlet 111, the laser signal passes through the combustible gas in the optical path (the transmission path of the laser) and reaches the laser receiving component 700. The combustible gas molecules absorb some of the energy of the laser signal, causing the intensity of the laser signal received by the laser receiving component 700 to be attenuated. The laser receiving component 700 transmits the received laser signal to the sensor signal processing unit 500 on the main board 200. The sensor signal processing unit 500 can calculate the concentration value of the combustible gas and some control parameter feedback values based on the laser signal attenuation, and sends these results back to the sensor control unit 400. The sensor control unit 400 adjusts the intensity of the emitted laser signal according to the feedback value and outputs the concentration value to the main control unit 300, thereby realizing the function of detecting concentration.
[0038] This combustible gas detector adopts a superior integrated design, integrating the sensor control unit 400, sensor signal processing unit 500, main control unit 300, laser emitting component 600, and laser receiving component 700 onto the motherboard 200. Combining the sensor control unit 400, sensor signal processing unit 500, and main control unit 300 into one provides greater flexibility for algorithm optimization. During testing, only a single calibration test of the entire device is required, eliminating the need for separate calibration tests of the laser sensor as in existing technologies. This not only saves labor and time costs but also makes the calibration test results more accurate and closer to real-world application scenarios. Furthermore, this integrated design maximizes the reuse of similar functional units. The original laser sensor control unit and sensor signal processing unit 500 are ported to the motherboard 200, and the laser emitting component 600 and laser receiving component 700 are directly connected to the motherboard 200, eliminating the need for a traditional laser sensor control board. This significantly reduces the number of components used and lowers the structural complexity of the combustible gas detector. Since there is no internal laser sensor control board, the structure of the combustible gas detector is no longer limited by the location requirements of the laser sensor control board. The laser emitting component 600 and the laser receiving component 700 can be flexibly installed in suitable positions on the main board 200, optimizing the overall layout of the combustible gas detector and making the gas passage more unobstructed. Understandably, this structural simplification greatly simplifies the production process, eliminating the need for laser sensor control board manufacturing, assembly, testing, and calibration, thus saving on laser sensor manufacturing costs and consequently reducing the factory cost. By integrating the laser emitting component 600 and the laser receiving component 700 into the main board 200, laser sensor manufacturers only need to focus on the research of the more technologically advanced transmitter 610 and receiver 710, without needing to worry about the overall design. This specialization will inevitably further reduce the price of the transmitter 610 and receiver 710, meaning the price of the combustible gas detector will also decrease further. While the main board 200 adds some peripheral circuitry, these are conventional circuits and will not significantly increase costs.
[0039] Furthermore, the housing 100 includes a front housing 110 and a rear cover 120, with an air inlet 111 disposed on the front housing 110, and the rear cover 120 and the front housing 110 being sealed together. The front housing 110 has a receiving cavity, and the main board 200 is disposed inside the receiving cavity. The air inlet 111 includes a plurality of densely arranged square openings to ensure that combustible gas can enter the receiving cavity in the event of a leak.
[0040] See also Figure 2The mainboard 200 also includes a power supply unit 1000, a communication unit 1200, a linkage unit 900, and an audible-visual unit 1100. These units are all connected to the main control unit 300. The power supply unit 1000 is electrically connected to the sensor control unit 400, the sensor signal processing unit 500, the main control unit 300, the laser emitting component 600, and the laser receiving component 700. The power supply unit 1000 includes a power socket 1010 for connecting to a plug, thus connecting the power supply unit 1000 to 220V AC power. In the event of a combustible gas leak, the main control unit 300 can control the linkage unit 900 to output a valve-closing pulse signal, closing the solenoid valve or the internal valve of the gas meter, thereby preventing further gas leakage that could lead to fire, explosion, or other dangerous accidents. Simultaneously, the main control unit 300 controls the audible-visual unit 1100 to trigger an alarm. The communication unit 1200 is used to send monitoring data to the monitoring platform, which is typically the gas company's control system. Users can also be notified via SMS or WeChat.
[0041] Furthermore, Figure 3 A partial structural diagram of a combustible gas detector (laser emitting component 600 and laser receiving component 700 arranged in a certain direction) according to an embodiment of the present invention is shown schematically. See also Figure 3 The laser emitting assembly 600 includes a transmitter 610 and a transmitter board 620. The transmitter board 620 is signal-connected to the sensor control unit 400. The transmitter 610 is mounted on and signal-connected to the transmitter board 620. The transmitter board 620 is connected to the main board 200. Optionally, the transmitter 610 and the transmitter board 620 can be soldered together or connected via pins, making the transmitter 610 and the transmitter board 620 a single unit, which can reduce the assembly difficulty of the laser emitting assembly 600 and the main board 200.
[0042] Optionally, the transmitter board 620 and the motherboard 200 are soldered together. By soldering the transmitter board 620 directly to the motherboard 200, no other components are needed, resulting in a simpler structure and a more secure connection.
[0043] Furthermore, the laser receiving assembly 700 includes a receiver 710 and a receiving board 720. The receiving board 720 is connected to the signal processing unit, the receiver 710 is disposed on the receiving board 720 and is signal-connected to the receiving board 720, and the receiving board 720 is connected to the main board 200. Optionally, the receiver 710 and the receiving board 720 can be soldered together or connected by pins, making the receiver 710 and the receiving board 720 a whole, which can reduce the assembly difficulty of the laser receiving assembly 700 and the main board 200.
[0044] Optionally, the receiver board 720 and the main board 200 are soldered together. By soldering the receiver board 720 directly to the main board 200, no other components are needed, resulting in a simpler structure and a more secure connection.
[0045] Furthermore, Figure 4 A partial structural schematic diagram of a combustible gas detector (laser emitting assembly 600 and laser receiving assembly 700 arranged in another direction) according to an embodiment of the present invention is shown. See also Figure 3 and Figure 4 The laser emitting component 600 and the laser receiving component 700 are arranged opposite each other in any direction along the main board 200. Understandably, since the laser emitting component 600 and the laser receiving component 700 are not restricted by other connecting parts 830, they can be flexibly arranged on the main board 200. Their positions or the length of the optical path (laser transmission path) can be changed according to the layout area and structural appearance requirements of the main board 200, adapting to local conditions. This is beneficial for the miniaturization of the overall structure of the combustible gas detector and also helps to extend the optical path and increase detection accuracy.
[0046] Furthermore, Figure 5 A partial structural diagram of a combustible gas detector (with a recess 210 on the main board 200) according to an embodiment of the present invention is shown schematically. See also Figure 5 In some embodiments, the laser emitting component 600 and the laser receiving component 700 are embedded in the motherboard 200, and the motherboard 200 has a groove 210 extending along the laser transmission path, and the laser emitting component 600 and the laser receiving component 700 are both recessed into the interior of the groove 210.
[0047] Optionally, the transmitter plate 620 and receiver plate 720 are inserted into the main board 200, causing the transmitter 610 and receiver 710 to sink into the main board 200, using the groove 210 as a gas pool. This structural design allows for a more secure fixation of the laser transmitter assembly 600 and laser receiver assembly 700, resulting in a more stable optical path. Optionally, the groove 210 can be a through-slot, connecting both sides of the main board 200. This increases the area of the open gas pool, allowing combustible gases freely diffusing to both sides of the main board 200 to be used for concentration detection, effectively shortening detection time and facilitating rapid audible and visual alarm activation. Furthermore, since the through-slot connects both sides of the main board 200, the air inlet 111 can be located on either side of the main board 200, which benefits the design of the housing 100's structural appearance.
[0048] Furthermore, Figure 6 A partial structural diagram of a combustible gas detector (with a reflector 800 mounted on the main board 200) according to an embodiment of the present invention is shown schematically. See also Figure 6 In some implementations, a reflector 800 is provided on the motherboard 200, and the laser emitted by the laser emitting component 600 is reflected by the reflector 800 to the laser receiving component 700. The laser emitting component 600 and the laser receiving component 700 are independent devices and their positions can be interchanged as needed. The arrangement of the reflector 800 can further extend the optical path. The optical path length is directly related to the accuracy of gas detection; a variable optical path means that the detection accuracy of the gas detector is selectable, allowing for different products to be provided to customers with different accuracy requirements.
[0049] like Figure 6 As shown, in this embodiment, the reflector 800 includes a first reflective surface 810 and a second reflective surface 820. The first reflective surface 810 and the laser emitting component 600 are disposed opposite to each other, and the second reflective surface 820 and the laser receiving component 700 are disposed opposite to each other. The laser emitted by the laser emitting component 600 is emitted to the first reflective surface 810, and then reflected by the first reflective surface 810 to the second reflective surface 820, and then reflected by the second reflective surface 820 to the laser receiving component 700.
[0050] Understandably, in other embodiments, the number of reflective surfaces can be set according to specific needs. Multiple reflections can increase the length of the optical path, thereby greatly improving the accuracy of gas concentration detection.
[0051] See also Figure 6 The laser emitting component 600 and the laser receiving component 700 are symmetrically arranged about a first direction, and the first reflecting surface 810 and the second reflecting surface 820 are about the first direction ( Figure 6 Symmetrical setting in the X direction.
[0052] For example, the laser emitting component 600 and the laser receiving component 700 are arranged side by side. The laser emitted by the laser emitting component is directed along a first direction to a first reflecting surface 810, reflected by the first reflecting surface 810 to a second reflecting surface 820, and then reflected along the first direction to the laser receiving component 700. Of course, in other embodiments, the laser emitting component 600 and the laser receiving component 700 may also be arranged at an angle, specifically according to the space on the motherboard 200, to ensure that the laser receiving component 700 can receive the laser emitted by the laser emitting component 600.
[0053] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A combustible gas detector, characterized in that, include: A housing (100) is provided with an air inlet (111), and the interior of the housing (100) is connected to the external environment through the air inlet (111); A motherboard (200) is disposed inside the housing (100). The motherboard (200) is provided with a main control unit (300), a sensor control unit (400), and a sensor signal processing unit (500). The sensor signal processing unit (500) and the sensor control unit (400) are connected by signals, and the sensor control unit (400) and the main control unit (300) are connected by signals. A laser emitting component (600) is connected to the motherboard (200). The laser emitting component (600) is signal-connected to the sensing control unit (400). The sensing control unit (400) is used to control the laser emitting component (600) to emit laser light. A laser receiving component (700) is connected to the motherboard (200) and is signal-connected to the sensing signal processing unit (500). The laser receiving component (700) is used to receive the laser emitted by the laser emitting component (600).
2. The combustible gas detector according to claim 1, characterized in that, The laser emitting assembly (600) includes a transmitter (610) and a transmitter plate (620). The transmitter plate (620) is signal-connected to the sensing control unit (400). The transmitter (610) is disposed on the transmitter plate (620) and signal-connected to the transmitter plate (620). The transmitter plate (620) is connected to the motherboard (200).
3. The combustible gas detector according to claim 2, characterized in that, The transmitter plate (620) and the main board (200) are welded together.
4. The combustible gas detector according to claim 1, characterized in that, The laser receiving assembly (700) includes a receiver (710) and a receiving board (720). The receiving board (720) is connected to the signal processing unit. The receiver (710) is disposed on the receiving board (720) and is signal-connected to the receiving board (720). The receiving board (720) is connected to the main board (200).
5. The combustible gas detector according to claim 4, characterized in that, The receiving board (720) and the main board (200) are welded together.
6. The combustible gas detector according to claim 1, characterized in that, The laser emitting component (600) and the laser receiving component (700) are arranged opposite each other along any direction of the motherboard (200).
7. The combustible gas detector according to claim 1, characterized in that, The laser emitting component (600) and the laser receiving component (700) are embedded in the motherboard (200). The motherboard (200) has a groove (210) extending along the laser transmission path. Both the laser emitting component (600) and the laser receiving component (700) are recessed into the interior of the groove (210).
8. The combustible gas detector according to any one of claims 1-7, characterized in that, The motherboard (200) is provided with a reflector (800), and the laser emitted by the laser emitting assembly (600) is reflected by the reflector (800) to the laser receiving assembly (700).
9. The combustible gas detector according to claim 8, characterized in that, The reflector (800) includes a first reflective surface (810) and a second reflective surface (820). The first reflective surface (810) and the laser emitting component (600) are disposed opposite to each other, and the second reflective surface (820) and the laser receiving component (700) are disposed opposite to each other. The laser emitted by the laser emitting component (600) is emitted to the first reflective surface (810), and reflected by the first reflective surface (810) to the second reflective surface (820), and then reflected by the second reflective surface (820) to the laser receiving component (700).
10. The combustible gas detector according to claim 9, characterized in that, The laser emitting component (600) and the laser receiving component (700) are symmetrically arranged about a first direction, and the first reflecting surface (810) and the second reflecting surface (820) are symmetrically arranged about the first direction.