Miniature carbon monoxide gas sensing module

Abstract

The utility model discloses a miniature carbon monoxide gas sensing module which is characterized in that the miniature carbon monoxide gas sensing module comprises a shell, the shell is provided with an upper opening and a lower opening, a first reflecting mirror and a second reflecting mirror are installed in the shell in a spaced mode, and the opposite side faces of the first reflecting mirror and the second reflecting mirror are toric surfaces; the first reflecting mirror is provided with a light inlet hole and a light outlet hole, and the shell is provided with a laser emitting laser to the light inlet hole and a receiver receiving the laser from the light outlet hole; an upper cover plate is mounted on the upper opening, a gas inlet end for filling carbon monoxide gas into the shell is arranged on the upper cover plate, and a lower cover plate is mounted on the lower opening; the overall structure does not change the size of the shell, the number of the reflectors is small, the overall size can be controlled within 100 cm < 3 >, and the laser optical path can be increased to the meter level or above.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection sensors, in particular to a miniature carbon monoxide gas sensor module. Background Art

[0002] Carbon monoxide is a tasteless, colorless and odorless gas. Higher concentrations of carbon monoxide can cause varying degrees of harm to the human body, even coma or death from electric shock. Carbon monoxide in underground mine working environments mainly comes from gas, coal dust explosions, coal oxidation and fire, as well as blasting operations at mining faces. In order to ensure the safety of the working environment in mines and the personal safety of workers, the carbon monoxide concentration in mine air shall not exceed 0.0024%.

[0003] Based on the principle of tunable semiconductor laser absorption spectroscopy (TDLAS), the carbon monoxide concentration in mine air can be detected through a portable gas detection sensor. Since the detection accuracy is related to the movement path of the laser in the carbon monoxide gas, generally speaking, the movement length of the laser in the detected gas is increased by adding more reflectors and refraction mirrors inside. However, this increases the volume of the entire sensor module, making it inconvenient to carry in mines. Utility Model Content

[0004] (1) Technical issues

[0005] The purpose of the utility model is to provide a miniature carbon monoxide gas sensor module to solve the problem in the prior art that the increase in the length of the laser moving stroke requires an increase in the number of reflectors and refracting mirrors, which results in an increase in the volume of the entire sensor module and is inconvenient to carry.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A miniature carbon monoxide gas sensor module includes a shell having an upper opening and a lower opening. A first reflector and a second reflector are installed in the shell at intervals, and the facing sides of the first reflector and the second reflector are both complex surfaces; the first reflector is provided with a light inlet and a light outlet, and the shell is provided with a laser for emitting laser light toward the light inlet and a receiver for receiving laser light from the light outlet; an upper cover is installed on the upper opening, and an air inlet end for filling the interior of the shell with carbon monoxide gas is provided on the upper cover; a lower cover is installed on the lower opening.

[0009] Preferably, a back cover for covering the laser and the receiver is installed on the housing.

[0010] Preferably, the air inlet end includes a first air inlet hole, a second air inlet hole and a third air inlet hole which are spaced apart on the upper cover plate, and the first air inlet hole is located between the second air inlet hole and the third air inlet hole.

[0011] Preferably, the aperture of the first air inlet hole is larger than the apertures of the second air inlet hole and the third air inlet hole.

[0012] Preferably, a first filter screen corresponding to the first air inlet hole, a second filter screen corresponding to the second air inlet hole, and a third filter screen corresponding to the third air inlet hole are installed on the upper cover plate.

[0013] Preferably, the shell has an inner cavity wall, and a black coating layer is provided on the inner cavity wall.

[0014] Preferably, the first reflector and the second reflector are perpendicular to the inner cavity wall of the housing and are fixed by an adhesive.

[0015] Preferably, the shell and the back cover are provided with a step structure located at the upper opening, and the upper cover plate is welded and fixed to the step structure.

[0016] Preferably, the lower cover is fixed to the shell by screws, and a sealing gasket is provided between the lower cover and the shell.

[0017] Preferably, a mounting nut is fixed on the lower cover plate.

[0018] (3) Beneficial effects

[0019] By installing a first reflector and a second reflector at intervals within the housing, and forming complex curved surfaces on the opposing sides of the first reflector and the second reflector, a circularly distributed reflection light path can be formed using the complex curved surfaces. When the laser light emitted by the laser enters the light inlet hole, it is reflected 16 times between the first reflector and the second reflector. After increasing the moving optical path of the laser light, it is emitted from the light outlet hole and received by the receiver. Carbon monoxide gas in the air is introduced into the housing through the air inlet end to absorb the laser light, thereby obtaining a corresponding detection signal.

[0020] The overall structure does not change the shell size, and the number of reflectors is small, so the overall volume can be controlled within 100cm 3 The laser optical path can be increased to above meter level. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the explosion structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic structural diagram of an embodiment of the utility model in an assembled state;

[0023] exist Figures 1 to 2 In the figure, the corresponding relationship between the component names or lines and the figure numbers is as follows:

[0024] Upper cover 1, first air inlet 21, second air inlet 22, third air inlet 23, back cover 2, shell 3, step structure 31, inner cavity wall 32, lower cover 4, bolt 5, first reflector 6, second reflector 7, light inlet 71, light outlet 72, first filter 8, second filter 9, third filter 10, laser 11, receiver 12. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] See also Figure 1-Figure 2As shown, in an embodiment of the present invention, a miniature carbon monoxide gas sensor module is provided, comprising a housing 3 having an upper opening and a lower opening. A first reflector 6 and a second reflector 7 are installed within the housing 3 at intervals. The first reflector 6 and the second reflector 7 are perpendicular to the inner wall 32 of the housing 3 and are fixed by adhesive. Specifically, a certain gap is required when installing the first reflector 6 and the second reflector 7 to allow for adhesive fixation and ensure that the axes of the first reflector 6 and the second reflector 7 are coaxial. The facing sides of the first reflector 6 and the second reflector 7 are toric surfaces, i.e., the first reflector 6 and the second reflector 7 are each provided with a toric surface, thereby generating multiple beams of reflected light along the circumferential direction. The specific number of reflected light beams can be varied depending on the design dimensions of the toric surface. Without changing the number or distance between the first reflector 6 and the second reflector 7, the module can reflect an incident laser beam at least 16 times, thereby increasing the laser optical path length while maintaining a compact size and improving detection accuracy. Specifically, a light inlet 71 and a light outlet 72 are provided on the first reflector 6. A laser 11 for emitting laser light toward the light inlet 71 and a receiver 12 for receiving laser light from the light outlet 72 are installed on the housing 3. By setting the light inlet 71, the laser light emitted by the laser 11 is emitted inward. After at least 16 reflections, the laser light is emitted from the light outlet 72 and received by the receiver 12, thereby generating a photoelectric signal. At the same time, an upper cover plate 1 is installed on the upper opening, and an air inlet end for filling the interior of the shell 3 with carbon monoxide gas is provided on the upper cover plate 1. A lower cover plate 4 is installed on the lower opening. The interior of the shell 3 is sealed by the upper cover plate 1 and the lower cover plate 4. Carbon monoxide contained in the external gas enters the interior of the shell 3 through the air inlet end. During the laser reflection process, it can be absorbed by the carbon monoxide gas to realize the detection of the carbon monoxide concentration based on the tunable semiconductor laser absorption spectroscopy (TDLAS) principle. The specific detection principle and the circuit control involved are all existing technologies and can be directly applied. The main purpose of this embodiment is to increase the laser optical path and reduce the volume. The overall volume can be controlled within 100 cm 3 In the case of the laser beam path can reach more than meter level, thus improving the detection accuracy.

[0027] Specifically, a back cover 2 for covering the laser 11 and the receiver 12 is installed on the housing 3 , and the laser 11 and the receiver 12 are covered and protected by the back cover 2 .

[0028] Carbon monoxide gas is introduced into the interior of the shell 3 through the air inlet end, and the air inlet end includes a first air inlet hole 21, a second air inlet hole 22 and a third air inlet hole 23 which are spaced apart on the upper cover plate 1. The first air inlet hole 21 is located between the second air inlet hole 22 and the third air inlet hole 23. By arranging multiple air inlet holes, the amount of gas entering the inner cavity of the shell 3 is increased. At the same time, the aperture of the first air inlet hole 21 is made larger than the apertures of the second air inlet hole 22 and the third air inlet hole 23, thereby increasing the amount of carbon monoxide gas flowing inward from the middle position of the inner cavity of the shell 3.

[0029] In order to prevent external impurities from entering the inner cavity of the shell 3, a first filter screen 8 corresponding to the first air inlet 21, a second filter screen 9 corresponding to the second air inlet 22, and a third filter screen 10 corresponding to the third air inlet 23 are installed on the upper cover plate 1 to filter impurities through the filters at corresponding positions.

[0030] In order to absorb stray light generated during the internal laser reflection process and thus achieve optical noise reduction, specifically, the shell 3 has an inner cavity wall 32, and a black coating layer is provided on the inner cavity wall 32 to absorb stray light by utilizing black.

[0031] Specifically, a step structure 31 is provided at the upper opening on the shell 3 and the back cover 2, and the upper cover plate 1 is welded and fixed on the step structure 31. The upper cover plate 1 is positioned, i.e., welded, through the step structure 31, and the back cover 2 is fixedly connected to the shell 3 at the same time.

[0032] In order to facilitate internal assembly and maintenance, the lower cover plate 4 is fixed to the shell 3 by screws. A sealing gasket is provided between the lower cover plate 4 and the shell 3. The lower cover plate 4 is locked to achieve internal sealing and prevent gas leakage. At the same time, a mounting nut is fixed on the lower cover plate 4. The entire module is installed by the mounting nut, which is convenient for carrying and use.

[0033] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and description, and should not be construed as indicating or implying relative importance.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A miniature carbon monoxide gas sensor module, characterized by: The invention comprises a shell (3), the shell (3) having an upper opening and a lower opening, a first reflector (6) and a second reflector (7) being installed in the shell (3) at intervals, and the facing sides of the first reflector (6) and the second reflector (7) are both complex curved surfaces; The first reflector (6) is provided with a light inlet (71) and a light outlet (72); the housing (3) is provided with a laser (11) for emitting laser light toward the light inlet (71), and a receiver (12) for receiving laser light from the light outlet (72); An upper cover plate (1) is mounted on the upper opening, an air inlet for filling the interior of the shell (3) with carbon monoxide gas is provided on the upper cover plate (1), and a lower cover plate (4) is mounted on the lower opening.

2. The micro carbon monoxide gas sensor module according to claim 1, characterized in that: A back cover (2) for covering the laser (11) and the receiver (12) is installed on the housing (3).

3. The micro carbon monoxide gas sensor module according to claim 1, characterized in that: The air inlet end comprises a first air inlet hole (21), a second air inlet hole (22) and a third air inlet hole (23) which are spaced apart and opened on the upper cover plate (1); the first air inlet hole (21) is located between the second air inlet hole (22) and the third air inlet hole (23).

4. The micro carbon monoxide gas sensor module according to claim 3, characterized in that: The aperture of the first air inlet hole (21) is larger than the apertures of the second air inlet hole (22) and the third air inlet hole (23).

5. The micro carbon monoxide gas sensor module according to claim 4, characterized in that: The upper cover plate (1) is provided with a first filter (8) corresponding to the first air inlet hole (21), a second filter (9) corresponding to the second air inlet hole (22), and a third filter (10) corresponding to the third air inlet hole (23).

6. A miniature carbon monoxide gas sensor module according to any one of claims 1 to 5, characterized in that: The housing (3) has an inner cavity wall (32), and a black coating layer is provided on the inner cavity wall (32).

7. The micro carbon monoxide gas sensor module according to claim 6, characterized in that: The first reflector (6) and the second reflector (7) are perpendicular to the inner cavity wall (32) of the housing (3) and are fixed by adhesive.

8. The micro carbon monoxide gas sensor module according to claim 2, characterized in that: The housing (3) and the rear cover (2) are provided with a step structure (31) located at the upper opening, and the upper cover plate (1) is welded and fixed on the step structure (31).

9. The micro carbon monoxide gas sensor module according to claim 8, characterized in that: The lower cover plate (4) is fixed to the housing (3) by screws, and a sealing gasket is provided between the lower cover plate (4) and the housing (3).

10. The micro carbon monoxide gas sensor module according to claim 9, characterized in that: A mounting nut is fixed on the lower cover plate (4).

Images