Point type laser gas sensor

Abstract

The utility model relates to the technical field of sensors, and discloses a point type laser gas sensor, which comprises a gauge outfit display and circuit integration device, a side guide device, a transition connection device and a monitoring sensor device, the gauge outfit display and circuit integration device comprises a first lower shell, an upper shell and a circuit board, the circuit board is sleeved in a closed space formed after the first lower shell and the upper shell are assembled, and the side guide device is composed of a photoelectric alarm assembly and an explosion-proof connector assembly. According to the point type laser gas sensor, the gauge head display and circuit integration device, the side guiding device, the transition connecting device and the monitoring sensor device are arranged to form the point type laser gas sensor, and in the using process, real-time online monitoring with non-contact, one-time calibration, high precision and high sensitivity can be achieved; after the point-type laser gas sensor provided by the utility model is installed and used in a multi-point type sectioning area network type coverage manner, the current situation that the labor intensity of manual operation is high and the danger is strong can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a point-type laser gas sensor. Background Art

[0002] A gas sensor is a converter that converts a certain gas volume fraction into a corresponding electrical signal. The internal detection head conditions and detects the gas sample through the gas sensor, which usually includes filtering out impurities and interfering gases, drying or refrigerating the instrument display part. As a prior art, the relevant technical content of the gas sensor has been disclosed. For example, the authorized patent with the announcement number CN108107086A proposes that "the present invention provides a gas detection method and a gas sensor based on an array gas sensor, which belongs to the field of gas identification. The method includes the following steps: real-time acquisition of the resistance value of the array gas sensor; calculating the resistance value change rate of the target sensor, and calculating the resistance value change rate of the gas sensor once each time a new resistance value is acquired; judging whether there is at least one gas sensor in the target sensor, M of the N consecutive resistance value change rates are greater than the resistance value change rate threshold; if so, judging whether the sensitivity of most gas sensors to all the target gases is greater than the sensitivity threshold; if so, taking the time point of the last resistance value acquisition used to calculate the first resistance value change rate in the N consecutive resistance value change rates as the gas sampling point".

[0003] However, it can be seen from the disclosure of the prior art that in the process of achieving the detection purpose, it needs to be calibrated repeatedly, which means that the existing device still has certain defects in accuracy and sensitivity. For this reason, this application will provide a point laser gas sensor for improvement. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a point-type laser gas sensor, which solves the problems raised by the above-mentioned background technology.

[0005] The utility model provides the following technical solutions: a point-type laser gas sensor, comprising a meter display and circuit integration device, a side guide device, a transition connection device, and a monitoring sensor device, wherein the meter display and circuit integration device comprises a first lower shell, an upper shell, and a circuit board, wherein the circuit board is mounted in a closed space formed by assembling the first lower shell and the upper shell;

[0006] The side guide device is composed of a photoelectric alarm assembly and an explosion-proof joint assembly, which are respectively installed on both sides of the top of the first lower shell, and the transition connection device includes a thread joint assembly, and the top of the thread joint assembly is connected to the bottom of the first lower shell;

[0007] The monitoring sensor device includes a second lower shell, an upper cover, a waterproof and breathable component, an optical-mechanical component and a waterproof and breathable membrane. The top of the second lower shell is connected to the bottom of the thread connector component, the bottom of the second lower shell is installed on the top of the upper cover to form a protective space, the optical-mechanical component is sleeved inside the protective space, the waterproof and breathable membrane is attached to the top of the waterproof and breathable component and together with it is sleeved on the inner side of the middle part of the upper cover, the waterproof and breathable membrane is located between the waterproof and breathable component and the upper cover, and the waterproof and breathable component is nested on the inner side of the bottom of the upper cover.

[0008] Preferably, the surface of the front end of the first lower shell is connected to the inner side of the rear end of the upper shell by threads, and the first lower shell and the upper shell are both made of aluminum alloy.

[0009] The thread joint assembly is composed of a S-shaped external threaded barrel, an internal threaded sleeve and a T-shaped internal threaded barrel. The bottom of the S-shaped external threaded barrel is fitted and connected with the top of the T-shaped internal threaded barrel. The internal threaded sleeve is clamped on the outside of the top of the T-shaped internal threaded barrel and is threadedly connected with the bottom of the S-shaped external threaded barrel.

[0010] Preferably, the top of the bottom of the Chinese-character-shaped externally threaded barrel is threadedly connected to the inner side of the bottom of the first lower shell body.

[0011] Preferably, a protruding threaded rod is provided on the top of the second lower shell body, and the protruding threaded rod is locked with the inner thread of the T-shaped internal threaded tube, the waterproof grade of the waterproof breathable membrane is IP68, the air permeability of the waterproof breathable membrane is 1000-1500mL / cm² / min (7kPa), and the bottom of the upper cover and the interior of the waterproof breathable assembly are both provided with air intake space.

[0012] Preferably, the side guide device is composed of two explosion-proof joint assemblies, and the two explosion-proof joint assemblies are respectively installed on both sides of the top of the first lower shell.

[0013] Preferably, the side guide device is composed of an explosion-proof joint assembly and an antenna, and the explosion-proof joint assembly and the antenna are respectively installed on both sides of the top of the first lower shell.

[0014] Preferably, the meter display and circuit integration device also includes an electronic display for displaying data parameters.

[0015] Preferably, the transition connection device also includes a flexible joint and a live pipe joint.

[0016] The meter display and circuit integration device is provided with a Bluetooth module, and the supported communication modes include 485, 4-20ma; NB-IoT, 4GCat1.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model comprises a meter display and circuit integration device, a side guide device, a transition connection device and a monitoring sensor device to form a point-type laser gas sensor. During use, non-contact, one-time calibration, high-precision and high-sensitivity real-time online monitoring can be realized.

[0019] 2. The point laser gas sensor proposed in the utility model can solve the current situation of high labor intensity and high risk of manual work after being installed and used in multi-point area network coverage, and can also meet the use requirements of simplicity, convenient layout, complete functions, timely response, and flexible expansion in terms of technical structure.

[0020] 3. The point laser gas sensor proposed by the utility model has multiple usage modes, and can be applied to different environments, meet different usage requirements, and has a wide range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of the first structural embodiment of the utility model;

[0022] Figure 2 It is a front view schematic diagram of the first embodiment of the structure of the utility model;

[0023] Figure 3 It is a bottom view schematic diagram of the first structural embodiment of the utility model;

[0024] Figure 4 It is an exploded view of the first embodiment of the structure of the utility model;

[0025] Figure 5 It is a cross-sectional schematic diagram of the second structural embodiment of the utility model;

[0026] Figure 6 It is a front view schematic diagram of the second structural embodiment of the utility model;

[0027] Figure 7 It is a bottom view schematic diagram of the second structural embodiment of the utility model;

[0028] Figure 8 It is an exploded view of the second structural embodiment of the utility model;

[0029] Fig. 9 It is a cross-sectional schematic diagram of the third structural embodiment of the utility model;

[0030] Fig.10 It is a front view schematic diagram of the third structural embodiment of the utility model;

[0031] Fig.11 This is a bottom view schematic diagram of the third structural embodiment of the utility model;

[0032] Fig.12 It is an exploded view of the third structural embodiment of the utility model.

[0033] In the figure: 1. First lower shell; 2. Upper shell; 3. Photoelectric alarm assembly; 4. Explosion-proof connector assembly; 5. Thread connector assembly; 6. Second lower shell; 7. Upper cover; 8. Waterproof and breathable assembly; 9. Circuit board; 10. Optical-mechanical assembly; 11. Waterproof and breathable membrane; 12. Antenna. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Embodiment 1

[0035] See also Figure 1-4 A point-type laser gas sensor includes a meter display and circuit integration device, a side guide device, a transition connection device, and a monitoring sensor device. The meter display and circuit integration device includes a first lower shell 1, an upper shell 2, and a circuit board 9. The circuit board 9 is mounted in a closed space formed by assembling the first lower shell 1 and the upper shell 2.

[0036] The surface of the front end of the first lower shell 1 is connected to the inner side of the rear end of the upper shell 2 by threads, which is convenient for subsequent disassembly and maintenance of the circuit board 9. The first lower shell 1 and the upper shell 2 are both made of aluminum alloy material, which improves the corrosion resistance of the meter display and the circuit integration device. The meter display and the circuit integration device also include an electronic display with data parameter display, which facilitates the real-time collection and observation of subsequent detection data;

[0037] The side guide device is composed of a photoelectric alarm assembly 3 and an explosion-proof joint assembly 4, which are respectively installed on both sides of the top of the first lower shell 1, and the transition connection device includes a thread joint assembly 5, and the top of the thread joint assembly 5 is connected to the bottom of the first lower shell 1;

[0038] The thread joint assembly 5 is composed of a Chinese character external thread barrel, an internal thread sleeve and a T-shaped internal thread barrel. The bottom of the Chinese character external thread barrel is fitted and connected with the top of the T-shaped internal thread barrel. The internal thread sleeve is clamped on the outside of the top of the T-shaped internal thread barrel and is threadedly connected with the bottom of the Chinese character external thread barrel. The top of the bottom of the Chinese character external thread barrel is threadedly connected with the inner side of the bottom of the first lower shell 1. The thread joint assembly 5 provides a connection structure condition for the assembly of the meter display and circuit integration device and the monitoring sensor device, and the structure of the thread joint assembly 5 itself also has the use effect of disassembly and separation, and is flexible and diverse in use.

[0039] The monitoring sensor device includes a second lower shell 6, an upper cover 7, a waterproof and breathable component 8, an optical-mechanical component 10 and a waterproof and breathable membrane 11. The top of the second lower shell 6 is connected to the bottom of the thread connector component 5, the bottom of the second lower shell 6 is installed on the top of the upper cover 7 and forms a protective space, the optical-mechanical component 10 is sleeved inside the protective space, the waterproof and breathable membrane 11 is attached to the top of the waterproof and breathable component 8 and is sleeved together on the middle inner side of the upper cover 7, the waterproof and breathable membrane 11 is located between the waterproof and breathable component 8 and the upper cover 7, and the waterproof and breathable component 8 is nested on the inner side of the bottom of the upper cover 7;

[0040] A protruding threaded rod is provided on the top of the second lower shell 6, and the protruding threaded rod is locked with the inner thread of the T-shaped internal threaded tube, thereby improving the flexibility of installation and use of the second lower shell 6 and the first lower shell 1. The waterproof grade of the waterproof breathable membrane 11 is IP68, and the air permeability of the waterproof breathable membrane 11 is 1000-1500mL / cm² / min (7kPa). The bottom of the upper cover 7 and the interior of the waterproof breathable component 8 are both provided with air intake space.

[0041] Working principle: When in use, the gas to be detected passes through the waterproof and breathable component 8 and the upper cover 7 into the environment where the optical-mechanical component 10 is located. The optical signal captured by the optical-mechanical component 10 is a sensor based on tunable semiconductor laser absorption spectroscopy (TDLAS). TDLAS is the abbreviation of Tunable Diode Laser Absorption Spectroscopy. The laser gas detector mainly utilizes the narrow line width and wavelength of the tunable semiconductor laser that change with the injected current. By modulating the wavelength of the laser, the wavelength of the laser scans over the absorption peak of the gas molecules to be measured, so that based on the Lambert-Beer law, the gas molecules absorb the modulated laser, thereby realizing the measurement of the concentration of the gas molecules according to the absorption amount, and then the circuit board 9 in the header display and the circuit integration device performs photoelectric analog analysis and conversion, and the detection result will be quantitatively displayed in digital form on the header display and the electronic display in the circuit integration device. If it is an alarm type, the photoelectric alarm component 3 will be triggered at the same time to perform a photoelectric alarm, thereby realizing the system's early warning and alarm monitoring of the gas. Embodiment 2

[0042] See also Figure 5-8 A point-type laser gas sensor includes a meter display and circuit integration device, a side guide device, a transition connection device, and a monitoring sensor device. The meter display and circuit integration device includes a first lower shell 1, an upper shell 2, and a circuit board 9. The circuit board 9 is mounted in a closed space formed by assembling the first lower shell 1 and the upper shell 2.

[0043] The surface of the front end of the first lower shell 1 is connected to the inner side of the rear end of the upper shell 2 by threads, which is convenient for subsequent disassembly and maintenance of the circuit board 9. The first lower shell 1 and the upper shell 2 are both made of aluminum alloy material, which improves the corrosion resistance of the meter display and the circuit integration device. The meter display and the circuit integration device also include an electronic display with data parameter display, which facilitates the real-time collection and observation of subsequent detection data;

[0044] The side guide device is composed of two explosion-proof joint assemblies 4, which are respectively installed on both sides of the top of the first lower shell 1, and the transition connection device includes a thread joint assembly 5, and the top of the thread joint assembly 5 is connected to the bottom of the first lower shell 1;

[0045] The thread joint assembly 5 is composed of a Chinese character external thread barrel, an internal thread sleeve and a T-shaped internal thread barrel. The bottom of the Chinese character external thread barrel is fitted and connected with the top of the T-shaped internal thread barrel. The internal thread sleeve is clamped on the outside of the top of the T-shaped internal thread barrel and is threadedly connected with the bottom of the Chinese character external thread barrel. The top of the bottom of the Chinese character external thread barrel is threadedly connected with the inner side of the bottom of the first lower shell 1. The thread joint assembly 5 provides a connection structure condition for the assembly of the meter display and circuit integration device and the monitoring sensor device, and the structure of the thread joint assembly 5 itself also has the use effect of disassembly and separation, and is flexible and diverse in use.

[0046] The monitoring sensor device includes a second lower shell 6, an upper cover 7, a waterproof and breathable component 8, an optical-mechanical component 10 and a waterproof and breathable membrane 11. The top of the second lower shell 6 is connected to the bottom of the thread connector component 5, the bottom of the second lower shell 6 is installed on the top of the upper cover 7 and forms a protective space, the optical-mechanical component 10 is sleeved inside the protective space, the waterproof and breathable membrane 11 is attached to the top of the waterproof and breathable component 8 and is sleeved together on the middle inner side of the upper cover 7, the waterproof and breathable membrane 11 is located between the waterproof and breathable component 8 and the upper cover 7, and the waterproof and breathable component 8 is nested on the inner side of the bottom of the upper cover 7;

[0047] A protruding threaded rod is provided on the top of the second lower shell 6, and the protruding threaded rod is locked with the inner thread of the T-shaped internal threaded tube, thereby improving the flexibility of installation and use of the second lower shell 6 and the first lower shell 1. The waterproof grade of the waterproof breathable membrane 11 is IP68, and the air permeability of the waterproof breathable membrane 11 is 1000-1500mL / cm² / min (7kPa). The bottom of the upper cover 7 and the interior of the waterproof breathable component 8 are both provided with air intake space.

[0048] Working principle: When in use, the gas to be tested passes through the waterproof and breathable component 8 and the upper cover 7 into the environment where the optomechanical component 10 is located. The optical signal captured by the optomechanical component 10 is a sensor based on tunable semiconductor laser absorption spectroscopy (TDLAS). TDLAS is the abbreviation of Tunable Diode Laser Absorption Spectroscopy. The laser gas detector mainly utilizes the narrow line width and wavelength of the tunable semiconductor laser that change with the injected current. By modulating the wavelength of the laser, the wavelength of the laser scans over the absorption peak of the gas molecules to be tested, so that based on the Lambert-Beer law, the gas molecules absorb the modulated laser, thereby realizing the measurement of the concentration of the gas molecules according to the absorption amount, and then the circuit board 9 in the meter display and the circuit integration device performs photoelectric analog analysis and conversion, and the detection results will be quantitatively displayed in digital form on the meter display and the electronic display in the circuit integration device for direct recording and monitoring by the user. Embodiment 3

[0049] See also Figure 9-12 A point-type laser gas sensor includes a meter display and circuit integration device, a side guide device, a transition connection device, and a monitoring sensor device. The meter display and circuit integration device includes a first lower shell 1, an upper shell 2, and a circuit board 9. The circuit board 9 is mounted in a closed space formed by assembling the first lower shell 1 and the upper shell 2.

[0050] The surface of the front end of the first lower shell 1 is connected to the inner side of the rear end of the upper shell 2 by threads, which is convenient for subsequent disassembly and maintenance of the circuit board 9. The first lower shell 1 and the upper shell 2 are both made of aluminum alloy material, which improves the corrosion resistance of the meter display and the circuit integration device. The meter display and the circuit integration device also include an electronic display with data parameter display, which facilitates the real-time collection and observation of subsequent detection data;

[0051] The side guide device is composed of an explosion-proof joint assembly 4 and an antenna 12. The explosion-proof joint assembly 4 and the antenna 12 are respectively installed on both sides of the top of the first lower shell 1. The transition connection device includes a thread joint assembly 5, and the top of the thread joint assembly 5 is connected to the bottom of the first lower shell 1.

[0052] The meter display and circuit integration device are equipped with a Bluetooth module, which supports communication methods including 485, 4-20ma; NB-IoT, 4GCat1;

[0053] The thread joint assembly 5 is composed of a Chinese character external thread barrel, an internal thread sleeve and a T-shaped internal thread barrel. The bottom of the Chinese character external thread barrel is fitted and connected with the top of the T-shaped internal thread barrel. The internal thread sleeve is clamped on the outside of the top of the T-shaped internal thread barrel and is threadedly connected with the bottom of the Chinese character external thread barrel. The top of the bottom of the Chinese character external thread barrel is threadedly connected with the inner side of the bottom of the first lower shell 1. The thread joint assembly 5 provides a connection structure condition for the assembly of the meter display and circuit integration device and the monitoring sensor device, and the structure of the thread joint assembly 5 itself also has the use effect of disassembly and separation, and is flexible and diverse in use.

[0054] The monitoring sensor device includes a second lower shell 6, an upper cover 7, a waterproof and breathable component 8, an optical-mechanical component 10 and a waterproof and breathable membrane 11. The top of the second lower shell 6 is connected to the bottom of the thread connector component 5, the bottom of the second lower shell 6 is installed on the top of the upper cover 7 and forms a protective space, the optical-mechanical component 10 is sleeved inside the protective space, the waterproof and breathable membrane 11 is attached to the top of the waterproof and breathable component 8 and is sleeved together on the middle inner side of the upper cover 7, the waterproof and breathable membrane 11 is located between the waterproof and breathable component 8 and the upper cover 7, and the waterproof and breathable component 8 is nested on the inner side of the bottom of the upper cover 7;

[0055] A protruding threaded rod is provided on the top of the second lower shell 6, and the protruding threaded rod is locked with the inner thread of the T-shaped internal threaded tube, thereby improving the flexibility of installation and use of the second lower shell 6 and the first lower shell 1. The waterproof grade of the waterproof breathable membrane 11 is IP68, and the air permeability of the waterproof breathable membrane 11 is 1000-1500mL / cm² / min (7kPa). The bottom of the upper cover 7 and the interior of the waterproof breathable component 8 are both provided with air intake space.

[0056] Working principle: When in use, the gas to be detected passes through the waterproof and breathable component 8 and the upper cover 7 into the environment where the optical-mechanical component 10 is located. The optical signal captured by the optical-mechanical component 10 is a sensor based on tunable semiconductor laser absorption spectroscopy (TDLAS). TDLAS is the abbreviation of Tunable Diode Laser Absorption Spectroscopy. The laser gas detector mainly utilizes the narrow line width and wavelength of the tunable semiconductor laser that change with the injected current. By modulating the wavelength of the laser, the wavelength of the laser scans over the absorption peak of the gas molecules to be measured, so that based on the Lambert-Beer law, the gas molecules absorb the modulated laser, thereby realizing the measurement of the concentration of the gas molecules according to the absorption amount, and then the circuit board 9 in the header display and the circuit integration device performs photoelectric analog analysis and conversion, and the detection result will be quantitatively displayed in digital form on the header display and the electronic display in the circuit integration device, and the detected data can be remotely transmitted through the antenna 12 and the Bluetooth module, so that the user can remotely monitor it in the control background. Embodiment 4

[0057] See also Figure 1-4 A point-type laser gas sensor includes a meter display and circuit integration device, a side guide device, a transition connection device, and a monitoring sensor device. The meter display and circuit integration device includes a first lower shell 1, an upper shell 2, and a circuit board 9. The circuit board 9 is mounted in a closed space formed by assembling the first lower shell 1 and the upper shell 2.

[0058] The surface of the front end of the first lower shell 1 is connected to the inner side of the rear end of the upper shell 2 by threads, which is convenient for subsequent disassembly and maintenance of the circuit board 9. The first lower shell 1 and the upper shell 2 are both made of aluminum alloy material, which improves the corrosion resistance of the meter display and the circuit integration device. The meter display and the circuit integration device also include an electronic display with data parameter display, which facilitates the real-time collection and observation of subsequent detection data;

[0059] The side guide device is composed of a photoelectric alarm assembly 3 and an explosion-proof joint assembly 4, which are respectively installed on both sides of the top of the first lower shell 1, and the transition connection device also includes a flexible joint and a flexible joint, which is installed between the meter display and circuit integration device and the monitoring sensor device;

[0060] The monitoring sensor device includes a second lower shell 6, an upper cover 7, a waterproof and breathable component 8, an optical-mechanical component 10 and a waterproof and breathable membrane 11. The top of the second lower shell 6 is connected to the bottom of the thread connector component 5, the bottom of the second lower shell 6 is installed on the top of the upper cover 7 to form a protective space, the optical-mechanical component 10 is mounted inside the protective space, the waterproof and breathable membrane 11 is attached to the top of the waterproof and breathable component 8 and is jointly mounted on the middle inner side of the upper cover 7, the waterproof and breathable membrane 11 is located between the waterproof and breathable component 8 and the upper cover 7, and the waterproof and breathable component 8 is nested on the inner side of the bottom of the upper cover 7.

[0061] Working principle: When in use, the gas to be detected passes through the waterproof and breathable component 8 and the upper cover 7 into the environment where the optical-mechanical component 10 is located. The optical signal captured by the optical-mechanical component 10 is a sensor based on tunable semiconductor laser absorption spectroscopy (TDLAS). TDLAS is the abbreviation of Tunable Diode Laser Absorption Spectroscopy. The laser gas detector mainly utilizes the narrow line width and wavelength of the tunable semiconductor laser that change with the injected current. By modulating the wavelength of the laser, the wavelength of the laser scans over the absorption peak of the gas molecules to be measured, so that based on the Lambert-Beer law, the gas molecules absorb the modulated laser, thereby realizing the measurement of the concentration of the gas molecules according to the absorption amount, and then the circuit board 9 in the header display and the circuit integration device performs photoelectric analog analysis and conversion, and the detection result will be quantitatively displayed in digital form on the header display and the electronic display in the circuit integration device. If it is an alarm type, the photoelectric alarm component 3 will be triggered at the same time to perform a photoelectric alarm, thereby realizing the system's early warning and alarm monitoring of the gas.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. At the same time, in the drawings of the present utility model, the fill pattern is only for distinguishing the layers, without any other limitation.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A point-type laser gas sensor, comprising a meter display and circuit integration device, a side guide device, a transition connection device, and a monitoring sensor device, characterized in that: The meter display and circuit integration device comprises a first lower shell (1), an upper shell (2) and a circuit board (9), wherein the circuit board (9) is mounted in a closed space formed by assembling the first lower shell (1) and the upper shell (2); The side guide device is composed of a photoelectric alarm assembly (3) and an explosion-proof joint assembly (4), wherein the photoelectric alarm assembly (3) and the explosion-proof joint assembly (4) are respectively installed on both sides of the top of the first lower shell (1), and the transition connection device includes a thread joint assembly (5), and the top of the thread joint assembly (5) is connected to the bottom of the first lower shell (1); The monitoring sensor device comprises a second lower shell (6), an upper cover (7), a waterproof and breathable component (8), an optical-mechanical component (10) and a waterproof and breathable membrane (11); the top of the second lower shell (6) is connected to the bottom of the thread connector component (5); the bottom of the second lower shell (6) is mounted on the top of the upper cover (7) to form a protective space; the optical-mechanical component (10) is mounted inside the protective space; the waterproof and breathable membrane (11) is located between the waterproof and breathable component (8) and the upper cover (7); and the waterproof and breathable component (8) is nested inside the bottom of the upper cover (7).

2. A point laser gas sensor according to claim 1, characterized in that: The surface of the front end of the first lower shell (1) is threadedly connected to the inner side of the rear end of the upper shell (2); the first lower shell (1) and the upper shell (2) are both made of aluminum alloy.

3. A point-type laser gas sensor according to claim 1, characterized in that: The thread joint assembly (5) is composed of a Chinese character "Z" external thread barrel, an internal thread sleeve and a T-shaped internal thread barrel. The bottom of the Chinese character "Z" external thread barrel is fitted and connected with the top of the T-shaped internal thread barrel. The internal thread sleeve is clamped on the outside of the top of the T-shaped internal thread barrel and is threadedly connected with the bottom of the Chinese character "Z" external thread barrel.

4. A point-type laser gas sensor according to claim 3, characterized in that: The top of the bottom of the Chinese-shaped external threaded cylinder is threadedly connected to the inner side of the bottom of the first lower shell (1).

5. A point-type laser gas sensor according to claim 3, characterized in that: The top of the second lower shell (6) is provided with a protruding threaded rod, and the protruding threaded rod is thread-locked with the inner side of the T-shaped internal threaded cylinder. The waterproof grade of the waterproof breathable membrane (11) is IP68, and the air permeability of the waterproof breathable membrane (11) is 1000-1500 mL / cm 2 / min (7 kPa), the bottom of the upper cover (7) and the interior of the waterproof breathable component (8) are both provided with air intake spaces.

6. A point-type laser gas sensor according to claim 1, characterized in that: The side guide device is composed of two explosion-proof joint assemblies (4), and the two explosion-proof joint assemblies (4) are respectively installed on both sides of the top of the first lower shell (1).

7. A point-type laser gas sensor according to claim 1, characterized in that: The side-guiding device is composed of an explosion-proof joint assembly (4) and an antenna (12); the explosion-proof joint assembly (4) and the antenna (12) are respectively mounted on two sides of the top of the first lower shell (1).

8. A point-type laser gas sensor according to claim 1, characterized in that: The meter display and circuit integration device also includes an electronic display for displaying data parameters.

9. A point-type laser gas sensor according to claim 1, characterized in that: The transition connection device also includes a flexible joint and a movable joint.

10. A point-type laser gas sensor according to claim 1, characterized in that: The meter display and circuit integration device is provided with a Bluetooth module, and the communication modes supported include 485 and 4-20ma; NB-IoT, 4GCat1.

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