Infrared detection module of micro correlation structure

Abstract

The utility model relates to the technical field of combustible gas monitoring equipment, in particular to an infrared detection module with a miniature correlation structure. A detection gas chamber is arranged in the support, the light source assembly is arranged at one end of the detection gas chamber, the detector is arranged at the other end of the detection gas chamber, the main control board is electrically connected to the detector, and the periphery of the support is sleeved with the shell. The gas inlet channel is arranged between the shell and the support, so that the detection gas chamber forms a semi-open type detection gas chamber, the influence of dust and ambient light on signal receiving of the detector is reduced, and the gas inlet amount of automatic diffusion of ambient gas and the response time of the sensor are also ensured. And the center of the infrared light and the center of the detector are coaxially arranged, so that the utilization rate of the infrared light is improved. The protection sheet enables gas or dust and the like in the external environment not to enter the areas of the light source assembly and the detector, so that corrosion and pollution of the external environment to electronic elements are avoided, and the detection accuracy and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of combustible gas monitoring equipment, in particular to an infrared detection module with a miniature counter-radiation structure. Background Art

[0002] In recent years, the national gas industry has developed rapidly, and liquefied gas, natural gas, coal-to-gas and other gases have been widely used as energy in industry and commerce. As a new type of energy, its popularization and application have undoubtedly played a huge role in improving the environmental quality of cities. However, with its widespread application, improper use or leakage of these gases will be harmful to health, easy to explode, and there are many hidden dangers and accidents. If the gas leak cannot be discovered and handled in time, it will bring catastrophic harm to society and residents, which to some extent increases the insecurity and instability of the city. For the petroleum, chemical, coal, metallurgy, gas, coking and other industries that widely use gas, any place that produces, stores, and uses flammable and explosive materials requires a monitoring system to ensure the safety of people, production and property.

[0003] Currently, most infrared combustible gas sensors on the market use a reflective solution. Although this solution has the advantage of a small size, since the gas chamber uses metal or coated metal to reflect infrared light, the reflective surface is in long-term contact with the external environment and is easily oxidized or corroded, weakening the receiving signal. Utility Model Content

[0004] In order to solve the technical defects mentioned in the above background technology, the purpose of the utility model is to provide an infrared detection module with a miniature counter-beam structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An infrared detection module with a miniature counter-radiation structure comprises a bracket with a detection chamber arranged inside, a light source assembly arranged at one end of the detection chamber, a detector arranged at the other end of the detection chamber, a main control board electrically connected to the detector, and a shell sleeved on the outer periphery of the bracket; an air intake passage is arranged between the shell and the bracket, the detection chamber is connected to the air intake passage, and the air intake passage is open on a side close to the light source assembly; the light source assembly is used to emit infrared light, and the center of the infrared light is coaxially arranged with the center of the detector; a protective sheet for sealing the light source assembly and the detector is provided on the side of the light source assembly and the detector facing the detection chamber.

[0007] By adopting the above technical solution, the structural limit of the bracket ensures that the beam center of the light source component and the detector center are always on the same axis, improving the utilization rate of infrared light. The detection chamber in the bracket is an open detection chamber. Since there is a housing outside the bracket and a gap exists between the inner wall of the housing and the bracket, that is, an air inlet channel, the open detection chamber of the bracket is formed into a semi-open detection chamber. This not only reduces the influence of dust and ambient light on the signal received by the detector, but also ensures the air intake of automatic diffusion of ambient gas and the response time of the sensor. The sealed protective sheet prevents gases, dust, etc. in the external environment from entering the areas of the light source component and the detector, avoiding corrosion and pollution of the electronic components by the external environment, which may affect the measurement accuracy, and improving the detection accuracy and stability.

[0008] Further, the bracket includes a first mounting position for mounting the light source component, a second mounting position for mounting the detector, and a plurality of columns. The plurality of columns are arranged at intervals, and the plurality of columns, the first mounting position, and the second mounting position enclose to form the detection chamber. Through holes are provided on one side of the first mounting position and the second mounting position facing the detection chamber and are coaxially arranged, reducing the interference of reflected light and improving the detection accuracy. An air inlet channel is formed between the plurality of columns and the inner wall of the housing. One end of the column is fixedly connected to the first mounting position, and the other end of the column is fixedly connected to the second mounting position. The structure is simple, and the rate of gas flowing into the detection chamber can be increased.

[0009] Further, the column is made of a conductive material, and the main control board is electrically connected to the light source component through the column to supply power to the light source component, which has multiple functions, saves costs, and reduces the volume of this structure.

[0010] Further, an air chamber tube is arranged in the bracket, the detection chamber is arranged inside the air chamber tube, and a plurality of ventilation holes communicating the detection chamber with the air inlet channel are arranged on the tube wall of the air chamber tube, reducing the interference of dust and ambient light on the signal received by the detector and improving the measurement accuracy. The air chamber tube is hermetically connected between the light source component and the detector.

[0011] Further, a cover plate is hermetically arranged on the side of the light source component facing away from the protective sheet, improving the sealing performance and preventing gases or dust in the external environment from entering the light source component, thereby improving the measurement accuracy.

[0012] Furthermore, a mounting hole is provided on the main control board, and the detector is welded in the mounting hole and is located on the side of the main control board facing the detection air chamber. The mounting hole structure is limited so that the center of the light beam of the light source assembly and the center of the detector are always on the same axis, thereby reducing the position error caused by assembly and improving the utilization rate of infrared light as well as the efficiency and accuracy of installation.

[0013] Furthermore, the light source assembly includes an infrared light source and a focusing structure. The infrared light source is arranged on the side of the focusing structure away from the detection air chamber. The focusing structure is arranged as a cylindrical structure with a parabolic inner surface. The focus of the parabola coincides with the point where the infrared light source generates light.

[0014] In summary, the beneficial effects of the utility model are:

[0015] The utility model uses the structural limitation of the bracket to make the center of the light beam of the light source assembly and the center of the detector always on the same axis, thereby improving the utilization rate of infrared light. The detection chamber in the bracket is an open detection chamber. Since a shell is provided on the outside of the bracket, there is a gap between the inner wall of the shell and the bracket, namely, an air inlet channel, so that the open detection chamber of the bracket is formed into a semi-open detection chamber, which not only reduces the influence of dust and ambient light on the detector receiving signal, but also ensures the air intake volume of the automatic diffusion of ambient gas and the response time of the sensor. The sealed protective sheet prevents gas or dust from the external environment from entering the area of the light source assembly and the detector, avoiding corrosion and pollution of the electronic components by the external environment, thereby affecting the measurement accuracy, and improving the accuracy and stability of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of an infrared detection module of a micro-radiation structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the internal support structure of an embodiment of the infrared detection module of the micro-radiation structure of the utility model.

[0018] Figure 3 It is a schematic diagram of the internal structure installation of an embodiment of an infrared detection module of a micro-radiation structure of the utility model.

[0019] Description of reference numerals in the figures:

[0020] 1. Infrared detection module with micro-counter-beam structure; 2. Bracket; 21. First mounting position; 22. Second mounting position; 23. Column; 24. Cover plate; 3. Detector; 4. Main control board; 5. Light source assembly; 51. Infrared light source; 52. Focusing structure; 6. Outer shell; 7. Air inlet passage; 8. Detection air chamber; 9. Protective sheet. Detailed implementation mode

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.

[0022] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.

[0023] In the description of the present utility model, if there are descriptions such as "several", its meaning is one or more, and the meaning of multiple is two or more. Understanding of greater than, less than, exceeding, etc. does not include the present number, and understanding of above, below, within, etc. includes the present number. If there are descriptions of first, second, third, etc., they are only used to distinguish technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0024] The following will further elaborate on the embodiments of the present utility model in conjunction with the attached Figures 1-3 drawings.

[0025] An infrared detection module 1 with a miniature opposed structure, as Figure 1 、 Figure 2 、 Figure 3 shown, includes a bracket 2 with a detection chamber 8 arranged inside, a light source assembly 5 arranged at one end of the detection chamber 8, a detector 3 arranged at the other end of the detection chamber 8, a main control board 4 electrically connected to the detector 3, and a housing 6 sleeved on the outer periphery of the bracket 2. An air inlet channel 7 is arranged between the housing 6 and the bracket 2, the detection chamber 8 is communicated with the air inlet channel 7, and the air inlet channel 7 is open on the side close to the light source assembly 5. The light source assembly 5 is used for emitting infrared light, and the center of the infrared light is coaxially arranged with the center of the detector 3. A protective sheet 9 for sealing the light source assembly 5 and the detector 3 is arranged on one side of the light source assembly 5 and the detector 3 facing the detection chamber 8. The protective sheet 9 is made of a material with high light transmittance to improve the signal reception intensity of the detector 3.

[0026] The structural limit of the bracket 2 keeps the beam center of the light source assembly 5 and the center of the detector 3 on the same axis all the time, improving the utilization rate of infrared light. The detection chamber 8 is an open detection chamber 8 in the bracket 2. Since there is a gap between the inner wall of the outer shell 6 and the bracket 2 outside the bracket 2, that is, the air inlet channel 7, the open detection chamber 8 of the bracket 2 is formed into a semi-open detection chamber 8. This not only reduces the influence of dust and ambient light on the signal received by the detector 3, but also ensures the air intake of the automatic diffusion of ambient gas and the response time of the sensor. The sealed protective sheet 9 prevents gas, dust, etc. in the external environment from entering the areas of the light source assembly 5 and the detector 3, avoiding the corrosion and pollution of the external environment to the electronic components, thus affecting the measurement accuracy, and improving the detection accuracy and stability.

[0027] In this embodiment, the bracket 2 includes a first mounting position 21 for mounting the light source assembly 5, a second mounting position 22 for mounting the detector 3, and a plurality of columns 23. The plurality of columns 23 are arranged at intervals, and the plurality of columns 23, the first mounting position 21, and the second mounting position 22 enclose to form the detection chamber 8. Through holes are provided on one side of the first mounting position 21 and the second mounting position 22 facing the detection chamber 8 and are coaxially arranged, reducing the interference of reflected light and improving the detection accuracy. An air inlet channel 7 is formed between the plurality of columns 23 and the inner wall of the outer shell 6. Among them, two columns 23 are provided in this embodiment. One end of the column 23 is fixedly connected to the first mounting position 21, and the other end of the column 23 is fixedly connected to the second mounting position 22. The structure is simple, and the rate of gas flowing into the detection chamber 8 can be increased. The first mounting position 21, the second mounting position 22, and the plurality of columns 23 are integrally injection-molded, so that the beam center of the light source assembly 5 and the center of the detector 3 are always on the same axis, reducing the positional error caused by assembly and improving the utilization rate of infrared light.

[0028] The column 23 is made of conductive material, and the main control board 4 is electrically connected to the light source assembly 5 through the column 23 for supplying power to the light source assembly 5, with multiple functions, saving costs and reducing the volume of this structure.

[0029] Of course, this scheme can also be used to supply power to the light source assembly 5. A high-voltage positive electrode sheet is covered on the surface of the column 23 for providing power to the light source assembly 5 in the bracket 2, and a negatively charged metal mesh is provided at the gas diffusion inlet. When external dust particles are negatively charged through the metal mesh and diffuse to the surface of the column 23 to discharge and deposit, the purpose of electrostatic dust removal and reducing the maintenance frequency of the detection module can be achieved. This high-voltage positive electrode sheet and metal mesh structure are not shown in the figure.

[0030] In another embodiment, an air chamber tube may be provided in the bracket 2, and a detection air chamber 8 is provided inside the air chamber tube. A plurality of vents connecting the detection air chamber 8 and the air inlet passage 7 are provided on the tube wall of the air chamber tube, thereby reducing the interference of dust and ambient light on the signal received by the detector 3 and improving the accuracy of the measurement. The air chamber tube is sealed and connected between the light source assembly 5 and the detector 3. Specifically, one end of the air chamber tube is tightly attached to the first mounting position 21, and the other end is tightly attached to the second mounting position 22. Among them, the first mounting position 21 and the second mounting position 22 are both configured as hole-like structures to improve the efficiency and accuracy of the installation. This air chamber tube structure is not drawn in the figure.

[0031] The main control board 4 and the detector 3 are both installed in the second installation position 22. A protective sheet 9 is sealed on one side of the second installation position 22, and the other side of the second installation position 22 is installed in a sealed cavity to transmit and display the measured values, thereby improving the sealing effect of the main control board 4 and the detector 3.

[0032] A cover plate 24 is sealed on one side of the light source assembly 5 away from the protective sheet 9. The cover plate 24 cooperates with the light source assembly 5 to seal, thereby improving the sealing performance and preventing gas or dust from the external environment from entering the light source assembly 5, thereby improving the measurement accuracy.

[0033] In this embodiment, a mounting hole is provided on the main control board 4, and the detector 3 is welded in the mounting hole and is located on the side of the main control board 4 facing the detection chamber 8. The mounting hole structure is limited so that the center of the light beam of the light source assembly 5 and the center of the detector 3 are always on the same axis, reducing the position error caused by assembly, improving the utilization rate of infrared light and the efficiency and accuracy of installation. The main control board 4 is arranged at one end of the detector 3, and the light source assembly 5 at the opposite end is powered by a conductive medium, so that the area of the main control board 4 is as small as possible, forming a detection module with a cylindrical miniaturized beam structure.

[0034] In this embodiment, the light source assembly 5 includes an infrared light source 51 and a focusing structure 52. The infrared light source 51 is arranged on the side of the focusing structure 52 away from the detection chamber 8. The focusing structure 52 is arranged as a cylindrical structure with a parabolic inner surface. The focus of the parabola coincides with the point where the light of the infrared light source 51 is generated.

[0035] An outer shell 6 is provided outside the bracket 2, so that the open detection gas chamber 8 of the bracket 2 is formed into a semi-open detection gas chamber 8. There is a gap (i.e., the intake channel 7) between the inner wall of the outer shell 6 and the bracket 2, and this intake channel 7 is the entry channel for the gas to be measured. Due to the obstruction of the cover plate 24 at one end of the bracket 2, the gas to be measured and external light cannot enter the detection gas chamber 8 in a straight line. This not only reduces the influence of dust and ambient light on the signal received by the detector 3, but also ensures the intake volume of automatically diffused ambient gas and the response time of the sensor. Since protection sheets 9 are provided on both sides of the detection gas chamber 8, when the user performs maintenance, they only need to remove the outer shell 6 and wipe a small amount of contaminants on the protection sheets 9, thereby increasing the service life of the detection module. The outer shell 6 is made of a metal material, which can not only meet the explosion-proof requirements but also avoid damage to the inside of the sensor caused by bumps.

[0036] The embodiments of the specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An infrared detection module with a miniature opposed structure, characterized in that The invention comprises a bracket (2) having a detection chamber (8) arranged therein, a light source assembly (5) arranged at one end of the detection chamber (8), a detector (3) arranged at the other end of the detection chamber (8), a main control board (4) electrically connected to the detector (3), and a housing (6) sleeved on the outer periphery of the bracket (2); an air intake passage (7) is arranged between the housing (6) and the bracket (2); the detection chamber (8) is connected to the air intake passage (7), and the air intake passage (7) is open on a side close to the light source assembly (5); the light source assembly (5) is used to emit infrared light, and the center of the infrared light is coaxially arranged with the center of the detector (3); and a protective sheet (9) for sealing the light source assembly (5) and the detector (3) is arranged on the side of the light source assembly (5) and the detector (3) facing the detection chamber (8).

2. The infrared detection module with a miniature opposed structure according to claim 1, wherein The bracket (2) comprises a first mounting position (21) for mounting the light source assembly (5), a second mounting position (22) for mounting the detector (3), and a plurality of columns (23); the plurality of columns (23) are arranged at intervals; the plurality of columns (23), the first mounting position (21), and the second mounting position (22) enclose the detection air chamber (8); the first mounting position (21) and the second mounting position (22) are provided with light holes on one side facing the detection air chamber (8) and are arranged coaxially; the air inlet channel (7) is formed between the plurality of columns (23) and the inner wall of the housing (6); one end of the column (23) is fixedly connected to the first mounting position (21), and the other end of the column (23) is fixedly connected to the second mounting position (22).

3. The infrared detection module with a miniature opposed structure according to claim 2, characterized in that The column (23) is configured as a conductive material, and the main control board (4) is electrically connected to the light source assembly (5) via the column (23) to supply power to the light source assembly (5).

4. The infrared detection module with a miniature opposed structure according to claim 1, characterized in that, An air chamber tube is arranged inside the bracket (2), the detection air chamber (8) is arranged inside the air chamber tube, and a plurality of air holes connecting the detection air chamber (8) and the air inlet channel (7) are arranged on the tube wall of the air chamber tube; the air chamber tube is sealed and connected between the light source assembly (5) and the detector (3).

5. The infrared detection module with a miniature opposed structure according to claim 1, characterized in that A cover plate (24) is sealedly provided on one side of the light source assembly (5) facing away from the protection sheet (9).

6. The infrared detection module with a miniature opposed structure according to claim 1, characterized in that, The main control board (4) is provided with a mounting hole, and the detector (3) is welded in the mounting hole and is located on a side of the main control board (4) facing the detection air chamber (8).

7. The infrared detection module with a miniature opposed structure according to claim 1, characterized in that The light source assembly (5) comprises an infrared light source (51) and a light-focusing structure (52); the infrared light source (51) is arranged on a side of the light-focusing structure (52) away from the detection air chamber (8); the light-focusing structure (52) is arranged as a cylindrical structure with a parabolic inner surface; the focus of the parabola coincides with a light generation point of the infrared light source (51).

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