Methane and carbon monoxide detection sensing module

Abstract

The utility model discloses a methane and carbon monoxide detection sensing module which comprises a main body and a detection cavity arranged in the main body, one end of the detection cavity is provided with an incident mirror, and the other end of the detection cavity is provided with a reflecting mirror. A first emergent hole located in the middle and a second emergent hole located below the first emergent hole are formed in the incident mirror, and a second incident hole is formed in the first incident hole and the reflecting mirror; a first laser, a first detector and a second detector are mounted on the main body, the first laser emits first laser towards the first incident hole, the first detector is used for receiving the first laser emitted by the second emergent hole, and the second detector is used for receiving the second laser emitted by the first emergent hole; a second laser is mounted on the main body and is used for emitting second laser to the second incident hole; a first sealing cover is arranged on the main body, and an air inlet hole is formed in the first sealing cover; the whole sensing module is small in size and convenient to carry, and methane and carbon monoxide gas detection can be achieved at the same time.

Description

A methane and carbon monoxide detection sensor module Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to a methane and carbon monoxide detection sensor module. Background Technology

[0002] In coal mining operations, safe production is of paramount importance, and accurate monitoring of underground gases is a crucial link in ensuring safety. Methane and carbon monoxide are key gases in coal mines, making accurate detection of their concentrations extremely significant.

[0003] Traditional coal mine gas detection technologies, such as catalytic combustion and infrared absorption sensors, have certain limitations. Catalytic combustion sensors are susceptible to poisoning by gases such as sulfides, leading to decreased detection accuracy and shortened lifespan. Infrared absorption sensors are easily affected by water vapor and dust in complex environments, resulting in poor stability. Both types of sensors generally suffer from slow response speeds, making it difficult to provide timely and accurate feedback when gas concentrations change abruptly, thus failing to meet the stringent requirements for real-time performance and accuracy in coal mine safety production.

[0004] Laser detection technology, with its unique advantages, is gradually being widely used in the field of coal mine gas detection. Tunable Laser Absorption Spectroscopy (TDLAS) utilizes the interaction between laser light and gas molecules to accurately measure gas concentration by detecting the degree to which a specific wavelength of laser light is absorbed by the gas. Compared with traditional detection technologies, TDLAS-based detection equipment has strong anti-interference capabilities, effectively resisting various interference factors in the complex environment of underground coal mines and ensuring the reliability of detection data; it has a fast response time, reacting to changes in gas concentration in a very short time, providing strong support for timely safety measures; it has high detection accuracy, accurately detecting even extremely low concentrations of gas, effectively preventing potential safety hazards; and it has a long service life, reducing equipment maintenance and replacement costs and improving production efficiency. However, existing methane and carbon monoxide detection modules are independent, integrated into a single detection module, resulting in a relatively large overall size. Summary of the Invention

[0005] The purpose of this invention is to provide a methane and carbon monoxide detection sensing module, which solves the problem of large overall size in the existing technology that uses separate methane and carbon monoxide detection modules integrated into a single unit.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A methane and carbon monoxide detection sensing module includes a main body and a detection cavity disposed within the main body. An incident mirror is mounted at one end of the detection cavity, and a reflector is mounted at the other end. The incident mirror has a first emission port located in the center and a second emission port and a first incident port located below the first emission port. The reflector has a second incident port coaxial with the first emission port. A first laser, a first detector, and a second detector are mounted on one side of the detection cavity. The first laser emits a first laser beam towards the first incident port. The first detector receives the first laser beam emitted from the second emission port, and the second detector receives the second laser beam emitted from the first emission port. A second laser is mounted on the other side of the detection cavity and emits a second laser beam towards the second incident port. A first sealing cover for sealing the detection cavity is provided on the main body, and an air inlet is provided on the first sealing cover.

[0008] Preferably, the first sealing cover is provided with a filter screen located below the air inlet and a waterproof and breathable membrane disposed on the filter screen.

[0009] Preferably, the main body has a first mounting slot for mounting a first laser, a second mounting slot for mounting a first detector, and a third mounting slot for mounting a second detector.

[0010] Preferably, the main body is equipped with a second sealing cover for protecting the first laser, the first detector, and the second detector.

[0011] Preferably, the main body has a fourth mounting slot for mounting a second laser.

[0012] Preferably, the main body is equipped with a third sealing cover for protecting the second laser.

[0013] Preferably, the second sealing cover has a first stepped groove, the third sealing cover has a second stepped groove, and the main body has a third stepped groove. The first stepped groove, the second stepped groove, and the third stepped groove together form an installation cavity, and the first sealing cover is securely installed in the installation cavity.

[0014] Preferably, the opposing sides of the incident mirror and the reflecting mirror are both complex surfaces.

[0015] Preferably, the bottom of the main body is provided with an integrated cavity for mounting a control circuit board, which is used to connect the first laser, the second laser, the first detector, and the second detector.

[0016] Beneficial effects:

[0017] By installing an incident mirror and a reflector at intervals within the detection cavity of the main body, the first laser emitted by the first laser enters through the first incident hole, reflects multiple times between the incident mirror and the reflector, and then exits through the second exit hole. The first detector detects the first laser, thus detecting the concentration of carbon monoxide gas. Conversely, the second laser emitted by the second laser enters through the second incident hole and exits directly through the first exit hole without any reflection. The second detector detects the second laser, thus detecting the concentration of methane gas. Therefore, without changing the detection cavity, by creating corresponding first incident holes, second incident holes, first exit holes, and second exit holes on the incident mirror and the reflector, different lasers emitted by different lasers can pass through non-interference optical paths to detect the concentration of different gases within the detection cavity. This makes the entire sensing module extremely small and portable, and it can simultaneously detect methane and carbon monoxide gas.

[0018] The detection chamber is sealed by the first sealing cap, while the air inlet provides a channel for gas to enter the detection environment. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the exploded structure of an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional structural schematic diagram of an embodiment of the present utility model;

[0021] Figure 3 is a bottom-view three-dimensional structural diagram of an embodiment of the present invention;

[0022] Figure 4 is a first-view three-dimensional structural diagram of the main body in an embodiment of this utility model;

[0023] Figure 5 is a second-view perspective three-dimensional structural diagram of the main body in an embodiment of this utility model;

[0024] In Figures 1 to 5, the correspondence between component names or lines and the attached drawing numbers is as follows:

[0025] 1. Main body; 2. Detection cavity; 3. Entrance mirror; 4. Reflector; 5. First exit hole; 6. Second exit hole; 7. First entrance hole; 8. First laser; 9. First detector; 10. Second detector; 11. Second laser; 12. First sealing cover; 13. Air inlet; 14. Filter screen; 15. Waterproof and breathable membrane; 16. First mounting groove; 17. Second mounting groove; 18. Third mounting groove; 19. Second sealing cover; 20. Fourth mounting groove; 21. Third sealing cover; 22. First step groove; 23. Second step groove; 24. Third step groove; 25. Integrated cavity; 26. Second entrance hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Referring to Figures 1-5, an embodiment of this utility model proposes a methane and carbon monoxide detection sensing module. The detection principle adopts the tunable laser spectral absorption detection method (TDLAS). Specifically, it includes a main body 1 and a detection cavity 2 disposed in the main body 1. An incident mirror 3 is installed at one end of the detection cavity 2, and a reflector 4 is installed at the other end of the detection cavity 2. The sides of the incident mirror 3 and the reflector 4 facing each other are both complex curved surfaces, which can achieve a long reflected optical path in a small interval distance.

[0028] The incident mirror 3 has a first exit hole 5 located in the middle and a second exit hole 6 and a first entrance hole 7 located below the first exit hole 5. The reflecting mirror 4 has a second entrance hole 26 coaxial with the first exit hole 5. The first exit hole 5 and the second entrance hole 26 are located in the middle of the incident mirror 3 and the reflecting mirror 4. When light passes through, it will not be reflected, but will directly enter from the second entrance hole 26 and exit from the first exit hole 5. The first entrance hole 7 and the second exit hole 6 are off-center relative to the center. Therefore, the light entering from the first entrance hole 7 will be reflected back and forth multiple times on the tortuous surface between the incident mirror 3 and the reflecting mirror 4 before exiting from the second exit hole 6, which has a longer optical path.

[0029] Specifically, a first laser 8, a first detector 9, and a second detector 10 are installed on the main body 1, located on one side of the detection cavity 2. The first laser 8 emits a first laser beam toward the first entrance hole 7, the first detector 9 receives the first laser beam emitted from the second exit hole 6, and the second detector 10 receives the second laser beam emitted from the first exit hole 5. Simultaneously, a second laser 11 is installed on the main body 1, located on the other side of the detection cavity 2, and emits a second laser beam toward the second entrance hole 26. The first laser beam is reflected back and forth in the entrance mirror 3 and the reflecting mirror 4 and then detected by the first detector 9, thereby detecting carbon monoxide gas in the detection cavity 2. The second laser beam passes directly through the detection cavity 2 and is detected by the second detector 10, thereby detecting methane gas in the detection cavity 2. Furthermore, the second laser beam is not interfered with by the first laser beam. Through the above structural arrangement, the two laser beams have independent optical paths, and the detection of two gases is achieved even when the first laser 8 and the second laser 11 emit laser beams of different wavelengths.

[0030] Meanwhile, a first sealing cover 12 for sealing the detection chamber 2 is provided on the main body 1. An air inlet 13 is provided on the first sealing cover 12. The detection chamber 2 is sealed by the first sealing cover 12 to prevent the external environment gas from flowing rapidly into the interior. The air inlet 13 provides a channel for the detection environment gas to enter the detection chamber 2, so that the gas to be detected in the detection chamber 2 can be retained for a period of time, thereby improving the detection accuracy.

[0031] To ensure the breathability and waterproofness of the air inlet 13, a filter screen 14 located below the air inlet 13 and a waterproof and breathable membrane 15 disposed on the filter screen 14 are provided on the first sealing cover 12. The filter screen 14 filters impurities to avoid interference during the detection process, while the waterproof and breathable membrane 15 ensures gas flow and avoids the influence of moisture.

[0032] Specifically, the main body 1 has a first mounting slot 16 for mounting the first laser 8, a second mounting slot 17 for mounting the first detector 9, and a third mounting slot 18 for mounting the second detector 10. By providing the first mounting slot 16, the second mounting slot 17, and the third mounting slot 18 on the main body 1, positioning is achieved during the assembly of the first laser 8, the first detector 9, and the second detector 10, ensuring that no shaking occurs. Simultaneously, a second sealing cover 19 is installed on the main body 1 to protect the first laser 8, the first detector 9, and the second detector 10. The second sealing cover 19 is detachable to allow for the assembly of internal components and provides protection for the internal components after being connected to the main body 1.

[0033] Specifically, a fourth mounting groove 20 for mounting the second laser 11 is provided on the main body 1. At the same time, a third sealing cover 21 for protecting the second laser 11 is installed on the main body 1. The second laser 11 is positioned and installed through the fourth mounting groove 20 to ensure the installation stability of the second laser 11, while the third sealing cover 21 protects the internal components.

[0034] Specifically, a first stepped groove 22 is provided on the second sealing cover 19, a second stepped groove 23 is provided on the third sealing cover 21, and a third stepped groove 24 is provided on the main body 1. The first stepped groove 22, the second stepped groove 23, and the third stepped groove 24 enclose and form an installation cavity. The first sealing cover 12 is fastened and installed in the installation cavity. By forming an installation cavity and then installing the first sealing cover 12, the connection strength between the second sealing cover 19 and the third sealing cover 21 on the main body 1 can be further enhanced, and the overall structural stability is better.

[0035] Meanwhile, an integrated cavity 25 is provided at the bottom of the main body 1. The integrated cavity 25 is used to install a control circuit board. The control circuit board is used to connect the first laser 8, the second laser 11, the first detector 9, and the second detector 10. Thus, the entire sensing module is small in size and can transmit the detection signal to the outside through the internally integrated control circuit board at the same time.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A methane and carbon monoxide detection sensing module, characterized in that: The device includes a main body (1) and a detection cavity (2) located within the main body (1). An incident mirror (3) is installed at one end of the detection cavity (2), and a reflector (4) is installed at the other end of the detection cavity (2). The incident mirror (3) has a first exit hole (5) located in the middle and a second exit hole (6) and a first entrance hole (7) located below the first exit hole (5). The reflector (4) has a second entrance hole (26) coaxial with the first exit hole (5). A first laser (8), a first detector (9), and a second detector (10) are installed on one side of the detection cavity (2). The first laser (8) emits a first laser toward the first entrance hole (7), the first detector (9) is used to receive the first laser emitted from the second exit hole (6), and the second detector (10) is used to receive the second laser emitted from the first exit hole (5); a second laser (11) is installed on the main body (1) on the other side of the detection cavity (2), and the second laser (11) is used to emit a second laser toward the second entrance hole (26); a first sealing cover (12) is provided on the main body (1) for sealing the detection cavity (2), and an air inlet (13) is provided on the first sealing cover (12).

2. The methane and carbon monoxide detection sensor module according to claim 1, characterized in that: The first sealing cover (12) is provided with a filter screen (14) located below the air inlet (13) and a waterproof and breathable membrane (15) provided on the filter screen (14).

3. The methane and carbon monoxide detection sensor module according to claim 1, characterized in that: The main body (1) has a first mounting slot (16) for mounting the first laser (8), a second mounting slot (17) for mounting the first detector (9), and a third mounting slot (18) for mounting the second detector (10).

4. The methane and carbon monoxide detection sensor module according to claim 3, characterized in that: The main body (1) is equipped with a second sealing cover (19) for protecting the first laser (8), the first detector (9) and the second detector (10).

5. The methane and carbon monoxide detection sensing module according to claim 4, characterized in that: The main body (1) has a fourth mounting slot (20) for mounting a second laser (11).

6. The methane and carbon monoxide detection sensing module according to claim 5, characterized in that: The main body (1) is equipped with a third sealing cover (21) for protecting the second laser (11).

7. The methane and carbon monoxide detection sensing module according to claim 6, characterized in that: The second sealing cover (19) has a first step groove (22), the third sealing cover (21) has a second step groove (23), and the main body (1) has a third step groove (24). The first step groove (22), the second step groove (23) and the third step groove (24) together form an installation cavity, and the first sealing cover (12) is fastened in the installation cavity.

8. A methane and carbon monoxide detection sensing module according to any one of claims 1-7, characterized in that: The sides of the incident mirror (3) and the reflecting mirror (4) facing each other are both complex surfaces.

9. The methane and carbon monoxide detection sensing module according to claim 8, characterized in that: The bottom of the main body (1) is provided with an integrated cavity (25), which is used to install a control circuit board. The control circuit board is used to connect the first laser (8), the second laser (11), the first detector (9), and the second detector (10).

Images