Low-concentration infrared carbon dioxide sensor probe

Abstract

The utility model discloses a low-concentration infrared carbon dioxide sensor probe which comprises a shell, a PCB (Printed Circuit Board), an infrared light source, a detector, a gas chamber mounting seat and a gas chamber upper cover, the air chamber upper cover is arranged at the bottom of an inner cavity of the shell, the air chamber mounting seat is arranged in the inner cavity of the shell and located above the air chamber upper cover, the infrared light source and the detector are arranged in the air chamber mounting seat and electrically connected with the PCB, the PCB is located at the top end of the air chamber mounting seat, and the air chamber mounting seat is arranged in the air chamber mounting seat. The inner cavity of the air chamber upper cover and the bottom wall of the air chamber mounting seat form an air chamber, and the bottom wall of the air chamber mounting seat is provided with a light source mounting hole for an infrared light source to pass through and a light outlet hole for a detector to receive infrared light. The utility model provides a low-concentration infrared carbon dioxide sensor probe which can improve the detection precision of low-concentration carbon dioxide.

Description

Technical Field

[0001] This utility model relates to a low-concentration infrared carbon dioxide sensor probe, belonging to the field of coal mine safety monitoring technology. Background Technology

[0002] Currently, infrared carbon dioxide sensor probes are gas detection devices based on non-dispersive infrared technology. They detect the concentration of carbon dioxide in the environment by measuring the absorption of infrared light at specific wavelengths. Their working principle is as follows: carbon dioxide molecules selectively absorb infrared light of specific wavelengths, and the absorption intensity is directly proportional to the concentration. The sensor incorporates an infrared light source, a gas chamber, a filter, and a detector. After the infrared light emitted by the light source passes through the gas chamber, the unabsorbed light is detected by the detector, and the carbon dioxide concentration is calculated based on the degree of signal attenuation.

[0003] Coal mining generates a large amount of carbon dioxide gas. Therefore, real-time monitoring of carbon dioxide concentration is necessary to prevent its accumulation, ensure the effectiveness of ventilation systems, and guarantee the safety of underground workers. The requirements for carbon dioxide concentration detection vary depending on the environment. For example, carbon dioxide concentrations are lower in low-altitude environments and within ventilation ducts. Accurately detecting these low concentrations in low-altitude environments and ventilation ducts is a pressing issue in coal mine safety. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a low-concentration infrared carbon dioxide sensor probe, which can improve the detection accuracy of low-concentration carbon dioxide.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A low-concentration infrared carbon dioxide sensor probe includes a housing, a PCB board, an infrared light source, a detector, a gas chamber mounting base, and a gas chamber cover;

[0007] The air chamber cover is located at the bottom of the inner cavity of the outer shell, and the air chamber mounting base is located in the inner cavity of the outer shell and above the air chamber cover. The infrared light source and detector are located inside the air chamber mounting base. The infrared light source and detector are electrically connected to the PCB board. The PCB board is located at the top of the air chamber mounting base. The inner cavity of the air chamber cover and the bottom wall of the air chamber mounting base form an air chamber. The bottom wall of the air chamber mounting base is provided with a light source mounting hole for the infrared light source to pass through and a light output hole for the detector to receive infrared light.

[0008] The inner cavity of the air chamber cover is cylindrical, and multiple air holes are provided on the bottom wall of the air chamber cover. The top of the air holes communicates with the air chamber, and the bottom area of ​​the air holes is larger than the top area of ​​the air holes.

[0009] Furthermore, a first sealing ring is provided between the outer wall of the air chamber cover and the inner wall of the outer shell.

[0010] Furthermore, a second sealing ring is provided between the outer wall of the air chamber mounting base and the inner wall of the outer shell.

[0011] Furthermore, a filter screen is provided between the bottom wall of the outer shell and the bottom wall of the air chamber cover.

[0012] Furthermore, the infrared light source is model MGG 1601-00.

[0013] Furthermore, the detector is model BLC211-D1R1.

[0014] By employing the above technical solution, this invention extends the reflection path of infrared light within the gas chamber, allowing the infrared light to fully contact the carbon dioxide gas inside, thereby improving the detection accuracy of carbon dioxide. Furthermore, designing the vent as a partially penetrating structure ensures that the intake of carbon dioxide gas exceeds the leakage, further enhancing detection accuracy. The outer shell and internal components of this invention are integrally sealed with adhesive, resulting in good sealing performance and a simple and practical structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the low-concentration infrared carbon dioxide sensor probe of this utility model;

[0016] Figure 2 This is a schematic diagram of the bottom wall structure of the air chamber mounting base of this utility model;

[0017] Figure 3 This is a top view of the air chamber cover of this utility model;

[0018] Figure 4 This is a front view of the air chamber cover of this utility model;

[0019] Figure 5 for Figure 4 A bottom view. Detailed Implementation

[0020] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] like Figure 1 As shown, this embodiment provides a low-concentration infrared carbon dioxide sensor probe, which includes a housing 1 and a PCB board 2, an infrared light source 3, a detector 4, a gas chamber mounting base 6, and a gas chamber cover 7 installed in the housing 1.

[0022] The air chamber cover 7 is located at the bottom of the inner cavity of the outer shell 1. A first sealing ring 11 is provided between the outer wall of the air chamber cover 7 and the inner wall of the outer shell 1 to seal the installation gap between the air chamber cover 7 and the outer shell 1. The air chamber mounting seat 6 is located in the inner cavity of the outer shell 1 and above the air chamber cover 7. A second sealing ring 12 is provided between the outer wall of the air chamber mounting seat 6 and the inner wall of the outer shell 1 to seal the installation gap between the air chamber mounting seat 6 and the outer shell 1. The infrared light source 3 and the detector 4 are mounted on the PCB board 2. The PCB board 2 is mounted on the top of the air chamber mounting seat 6, so that the infrared light source 3 and the detector 4 are located in the inner cavity of the air chamber mounting seat 6. Finally, epoxy resin 5 is used to seal the upper part of the outer shell 1, sealing the PCB board 2, the air chamber mounting seat 6, and the air chamber cover 7 in the outer shell 1 for sealing and fixation. The inner cavity of the air chamber cover 7 and the bottom wall of the air chamber mounting seat 6 constitute the air chamber. Figure 2 As shown, the bottom wall of the gas chamber mounting base 6 has a light source mounting hole 8 for the infrared light source 3 to pass through and two light output holes 9 for the detector 4 to receive infrared light. The infrared light source 3 extends into the gas chamber through the light source mounting hole 8. The infrared light emitted by the infrared light source 3 is reflected by the inner wall of the gas chamber cover 7 and then shines onto the detector 4 through the light output holes 9, thus completing the detection of the carbon dioxide concentration in the gas chamber.

[0023] like Figure 1 As shown, the infrared light source 3 in this embodiment is model MGG 1601-00, and the detector 4 is model BLC211-D1R1. The inner cavity of the gas chamber cover 7 is cylindrical. The infrared light emitted by the infrared light source 3 undergoes multiple reflections through the side walls and bottom walls of the inner cavity of the gas chamber cover 7, and finally shines onto the detector 4 through the two light exit holes 9. The cylindrical shape of the inner cavity of the gas chamber cover 7 lengthens the reflection path of the infrared light in the gas chamber, thereby prolonging the time for the infrared light to travel from the infrared light source 3 to the detector 4. This allows the infrared light to fully contact the carbon dioxide gas in the gas chamber, thereby improving the detection accuracy of carbon dioxide.

[0024] like Figure 1 , 3 As shown in Figures 4 and 5, the bottom wall of the gas chamber cover 7 in this embodiment has multiple air holes 10. The top of each air hole 10 communicates with the gas chamber, and the bottom area of ​​each air hole 10 is larger than its top area. Carbon dioxide gas enters from the bottom of the air hole 10 and then enters the gas chamber from the top. During the detection process, some carbon dioxide gas will leak from the air hole 10, resulting in inaccurate detection. In this embodiment, the air holes 10 are designed as a partially penetrating structure. If carbon dioxide gas leaks from the air hole 10, because the top of the air hole 10 is smaller than the bottom, the amount of carbon dioxide gas entering is greater than the amount leaking compared to a fully penetrating structure, thereby further improving the detection accuracy.

[0025] like Figure 1 As shown, in this embodiment, a filter screen 13 is provided between the bottom wall of the outer shell 1 and the bottom wall of the air chamber cover 7. The filter screen 13 is made of steel mesh and serves to filter dust.

[0026] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-concentration infrared carbon dioxide sensor probe, characterized in that: It includes a housing (1), a PCB board (2), an infrared light source (3), a detector (4), a chamber mounting base (6), and a chamber cover (7); The air chamber cover (7) is located at the bottom of the inner cavity of the outer shell (1). The air chamber mounting base (6) is located in the inner cavity of the outer shell (1) and above the air chamber cover (7). The infrared light source (3) and the detector (4) are located inside the air chamber mounting base (6). The infrared light source (3) and the detector (4) are electrically connected to the PCB board (2). The PCB board (2) is located at the top of the air chamber mounting base (6). The inner cavity of the air chamber cover (7) and the bottom wall of the air chamber mounting base (6) form an air chamber. The bottom wall of the air chamber mounting base (6) is provided with a light source mounting hole (8) for the infrared light source (3) to pass through and a light output hole (9) for the detector (4) to receive infrared light. The inner cavity of the air chamber cover (7) is cylindrical. Multiple air holes (10) are provided on the bottom wall of the air chamber cover (7). The top of the air hole (10) is connected to the air chamber. The bottom area of ​​the air hole (10) is larger than the top area of ​​the air hole (10).

2. The low-concentration infrared carbon dioxide sensor probe according to claim 1, characterized in that: A first sealing ring (11) is provided between the outer wall of the air chamber cover (7) and the inner wall of the outer shell (1).

3. The low-concentration infrared carbon dioxide sensor probe according to claim 1, characterized in that: A second sealing ring (12) is provided between the outer wall of the air chamber mounting base (6) and the inner wall of the outer shell (1).

4. The low-concentration infrared carbon dioxide sensor probe according to claim 1, characterized in that: A filter screen (13) is provided between the bottom wall of the outer shell (1) and the bottom wall of the air chamber cover (7).

5. The low-concentration infrared carbon dioxide sensor probe according to claim 1, characterized in that: The infrared light source (3) is model MGG 1601-00.

6. The low-concentration infrared carbon dioxide sensor probe according to claim 1, characterized in that: The detector (4) is model BLC211-D1R1.

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