A novel carbon dioxide sensor

Abstract

This utility model relates to the field of sensor technology and discloses a novel carbon dioxide sensor, including a sensor body and a mounting plate. The sensor body is fixedly mounted on the mounting plate, and a protective shell is slidably disposed on one side of the mounting plate. The sensor body is located inside the protective shell. A limiting plate is fixedly disposed on one side of the mounting plate, located on one side of the sensor body. An equidistantly spaced air inlet is provided on one side of the sensor body. This utility model uses a humidity compensation module to monitor the humidity of the gas entering the sensor body in real time. When the humidity changes, it can perform humidity compensation correction on the measurement results, ensuring that the sensor body can accurately measure carbon dioxide concentration under different humidity environments. This ensures that the working state of the sensor body in complex environments is not affected by environmental factors such as temperature and humidity, guaranteeing the accuracy of the measurement results.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, specifically, it relates to a novel carbon dioxide sensor. Background Technology

[0002] The optimal location for installing a carbon dioxide sensor indoors should be one that represents the carbon dioxide concentration of the monitored area, while avoiding direct exposure to ventilation openings, areas with high foot traffic, or equipment that may generate other gases. Specifically, the sensor should be installed at a height of 1.2 to 1.5 meters above the ground, aligned with the human breathing zone.

[0003] When carbon dioxide sensors are installed indoors for environmental monitoring, they can provide real-time information on indoor carbon dioxide concentration, offering data support for ventilation systems, ensuring indoor air quality, and creating a comfortable and healthy living and working environment. However, current carbon dioxide sensors on the market lack stability in complex environments and are easily affected by environmental factors such as temperature and humidity, leading to inaccurate measurement results.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: A novel carbon dioxide sensor includes a sensor body and a mounting plate. The sensor body is fixedly mounted on the mounting plate. A protective shell is slidably disposed on one side of the mounting plate, and the sensor body is located inside the protective shell. A limiting plate is fixedly disposed on one side of the mounting plate, located on one side of the sensor body. An air inlet is provided on one side of the sensor body, arranged equidistantly. Vent holes are provided on one side of the protective shell, and a cavity is disposed inside the sensor body. The air inlet communicates with the cavity. A printed circuit board is disposed inside the cavity. An infrared light-emitting diode, an infrared detector, a humidity compensation module, a temperature compensation module, and a microprocessor are disposed inside the cavity. The infrared light-emitting diode, the infrared detector, the humidity compensation module, the temperature compensation module, and the microprocessor are all electrically connected to the printed circuit board.

[0006] In a preferred embodiment of this utility model, the temperature compensation module adopts a high-precision thermistor, the temperature compensation module is in close contact with the infrared detector, the humidity compensation module adopts a capacitive humidity sensor, and the humidity compensation module is installed near the air inlet.

[0007] In a preferred embodiment of this utility model, a symmetrically arranged sliding groove is provided on one side of the mounting plate, and a symmetrically arranged guide strip is fixedly connected to one side of the protective shell, with the guide strip slidably connected to the inner wall of the sliding groove.

[0008] In a preferred embodiment of this utility model, a waterproof and breathable membrane is provided on one side of the inner wall of the protective shell, and the waterproof and breathable membrane is located between the sensor body and the vent.

[0009] In a preferred embodiment of this utility model, the limiting plate is provided with symmetrically arranged connecting grooves, and the protective shell is fixedly connected to one side with symmetrically arranged connecting seats. The connecting seats are adapted to the connecting grooves, and a positioning groove is provided on one side of the connecting seats.

[0010] In a preferred embodiment of this utility model, a symmetrically arranged mounting shell is fixedly connected to one side of the limiting plate, and a wedge-shaped positioning block is slidably arranged on the inner wall of the mounting shell, the positioning block being adapted to the positioning groove.

[0011] In a preferred embodiment of this utility model, a spring is installed on the inner wall of one side of the mounting housing, one end of the spring is connected to the outer wall of one side of the positioning block, a connecting block is slidably arranged on one side of the mounting housing, the connecting block is fixedly connected to the outer wall of one side of the positioning block, and one end of the connecting block is fixedly connected to the same connecting rod.

[0012] Compared with the prior art, the present invention has the following advantages: This invention features a temperature compensation module that monitors the temperature changes inside the sensor body in real time. When the temperature changes, it compensates for the impact of temperature changes on the measurement results. A humidity compensation module also monitors the humidity of the gas entering the sensor body in real time. When the humidity changes, it corrects the measurement results for humidity variations. This ensures that the sensor body can accurately measure carbon dioxide concentration under different humidity conditions, preventing interference from environmental factors such as temperature and humidity in complex environments and guaranteeing the accuracy of the measurement results.

[0013] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0014] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of a novel carbon dioxide sensor according to the present invention; Figure 2 This is a schematic diagram of the connection structure between the protective shell and the limiting plate of a novel carbon dioxide sensor according to this utility model. Figure 3 This is a schematic diagram of the cross-sectional structure of the protective shell, limiting plate, and mounting shell of a novel carbon dioxide sensor according to this utility model; Figure 4This is a side view cross-sectional structural diagram of the protective shell, limiting plate, and mounting shell of a novel carbon dioxide sensor according to this utility model; Figure 5 This utility model relates to a novel carbon dioxide sensor. Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the internal structure of the sensor body of a novel carbon dioxide sensor according to this utility model.

[0015] In the diagram: 1. Sensor body; 2. Mounting plate; 3. Protective housing; 4. Slide groove; 5. Guide strip; 6. Air inlet; 7. Limiting plate; 8. Vent hole; 9. Mounting housing; 10. Connecting seat; 11. Connecting groove; 12. Waterproof and breathable membrane; 13. Connecting rod; 14. Positioning groove; 15. Positioning block; 16. Spring; 17. Connecting block; 18. Cavity; 19. Printed circuit board; 20. Infrared light-emitting diode; 21. Infrared detector; 22. Humidity compensation module; 23. Temperature compensation module; 24. Microprocessor. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0017] like Figures 1 to 6 As shown A novel carbon dioxide sensor includes a sensor body 1 and a mounting plate 2. The sensor body 1 is fixedly mounted on the mounting plate 2. A protective shell 3 is slidably disposed on one side of the mounting plate 2, and the sensor body 1 is located inside the protective shell 3. A limiting plate 7 is fixedly disposed on one side of the mounting plate 2, located on one side of the sensor body 1. An air inlet 6 is equidistantly arranged around the sensor body 1 on one side, and a ventilation hole 8 is equidistantly distributed on one side of the protective shell 3. A cavity 18 is disposed inside the sensor body 1, and the air inlet 6 communicates with the cavity 18. Indoor gas enters the protective shell 3 through the ventilation hole 8 and enters the cavity 18 of the sensor body 1 through the air inlet 6. A printed circuit board 19 is disposed inside the cavity 18. An infrared light-emitting diode 20, an infrared detector 21, a humidity compensation module 22, a temperature compensation module 23, and a microprocessor 24 are disposed inside the cavity 18. The infrared light-emitting diode 20 serves as an infrared light source, emitting a wavelength that precisely matches the characteristic absorption wavelength of carbon dioxide gas. The infrared detector 21 converts the received infrared light signal into an electrical signal. Infrared detector 21, humidity compensation module 22, temperature compensation module 23, and microprocessor 24 are all electrically connected to printed circuit board 19. Microprocessor 24 is an STM32. Temperature compensation module 23 uses a high-precision thermistor and is in close contact with infrared detector 21. It monitors the temperature change inside sensor body 1 in real time. When the temperature changes, the resistance value of the thermistor changes accordingly. Microprocessor 24 automatically adjusts the driving current of infrared light source and the amplification factor of infrared detector 21 based on the resistance change of the thermistor to compensate for the influence of temperature change on measurement results. Humidity compensation module 22 uses a capacitive humidity sensor and is installed near air inlet 6. It monitors the humidity of the gas entering sensor body 1 in real time. When the humidity changes, the capacitance value of humidity sensor changes accordingly. Microprocessor 24 performs humidity compensation correction on the measurement results based on the capacitance change of humidity sensor to ensure that sensor body 1 can accurately measure carbon dioxide concentration under different humidity environments.

[0018] In a specific embodiment, a waterproof and breathable membrane 12 is provided on one inner wall of the protective shell 3. The waterproof and breathable membrane 12 is located between the sensor body 1 and the vent 8, ensuring that only gas can enter the interior of the sensor body 1, preventing moisture and small particles from damaging the internal components of the sensor body 1. A symmetrically arranged sliding groove 4 is provided on one side of the mounting plate 2. A symmetrically arranged guide strip 5 is fixedly connected to one side of the protective shell 3. The guide strip 5 is slidably connected to the inner wall of the sliding groove 4. A symmetrically arranged connecting groove 11 is provided on the limiting plate 7. A symmetrically arranged connecting seat 10 is fixedly connected to one side of the protective shell 3. The connecting seat 10 is adapted to the connecting groove 11. A positioning groove 14 is provided on one side of the connecting seat 10. A symmetrically arranged mounting shell 9 is fixedly connected to one side of the limiting plate 7. A wedge-shaped positioning block 15 is slidably arranged on the inner wall of the mounting shell 9. The positioning block 15 and the positioning groove 14 are connected to each other. The four-phase adapter has a spring 16 installed on the inner wall of one side of the mounting housing 9. One end of the spring 16 is connected to the outer wall of the positioning block 15. The sensor body 1 is fixedly installed on the mounting plate 2. After installation, the sensor body 1 is installed in a suitable indoor position through the mounting plate 2. Then, the protective housing 3 is moved by the sliding groove 4 and the guide bar 5. The protective housing 3 drives the connecting seat 10 to move, so that the connecting seat 10 moves to the inside of the connecting groove 11. At this time, the positioning block 15 is pushed into the positioning groove 14 under the action of the spring 16, realizing the positioning function of the connecting seat 10, so that the protective housing 3 is stable and can play a protective role for the sensor body 1. A connecting block 17 is slidably set on one side of the mounting housing 9. The connecting block 17 is fixedly connected to the outer wall of the positioning block 15. One end of the connecting block 17 is fixedly connected to the same connecting rod 13.

[0019] The implementation principle of this novel carbon dioxide sensor is as follows: In specific use, the sensor body 1 is fixedly installed on the mounting plate 2. After installation, the sensor body 1 is installed in a suitable indoor position through the mounting plate 2. Then, the protective shell 3 is moved by the sliding groove 4 and guide bar 5. The protective shell 3 drives the connecting seat 10 to move, so that the connecting seat 10 moves to the inside of the connecting groove 11. At this time, the positioning block 15 is pushed into the positioning groove 14 under the action of the spring 16, realizing the positioning function of the connecting seat 10, so that the protective shell 3 is stable and can protect the sensor body 1. When the sensor body 1 is working, indoor gas enters the protective shell 3 through the vent 8 and enters the cavity 18 of the sensor body 1 through the air inlet 6. The infrared light-emitting diode 20 is used as an infrared light source to emit light. The wavelength is precisely matched to the characteristic absorption wavelength of carbon dioxide gas. The infrared detector 21 converts the received infrared light signal into an electrical signal. The temperature compensation module 23 monitors the temperature change inside the sensor body 1 in real time. When the temperature changes, the resistance value of the thermistor changes accordingly. The microprocessor 24 automatically adjusts the driving current of the infrared light source and the amplification factor of the infrared detector 21 according to the change in the resistance value of the thermistor to compensate for the influence of temperature change on the measurement results. The humidity compensation module 22 monitors the humidity of the gas entering the sensor body 1 in real time. When the humidity changes, the capacitance value of the humidity sensor changes accordingly. The microprocessor 24 performs humidity compensation correction on the measurement results according to the change in the capacitance value of the humidity sensor, ensuring that the sensor body 1 can accurately measure the carbon dioxide concentration under different humidity environments.

Claims

1. A novel carbon dioxide sensor comprising a sensor body (1) and a mounting plate (2), characterized in that, The sensor body (1) is fixedly mounted on the mounting plate (2). A protective shell (3) is slidably provided on one side of the mounting plate (2). The sensor body (1) is located inside the protective shell (3). A limiting plate (7) is fixedly provided on one side of the mounting plate (2). The limiting plate (7) is located on one side of the sensor body (1). An air inlet (6) is provided on one side of the sensor body (1) and is arranged in a circumferential manner at equal intervals. Ventilation holes (8) are provided on one side of the protective shell (3) and are distributed at equal intervals. A cavity is provided inside the sensor body (1). The body (18) has an air inlet (6) that communicates with the cavity (18). A printed circuit board (19) is provided inside the cavity (18). An infrared light-emitting diode (20), an infrared detector (21), a humidity compensation module (22), a temperature compensation module (23), and a microprocessor (24) are provided inside the cavity (18). The infrared light-emitting diode (20), the infrared detector (21), the humidity compensation module (22), the temperature compensation module (23), and the microprocessor (24) are all electrically connected to the printed circuit board (19).

2. A novel carbon dioxide sensor as claimed in claim 1, wherein, The temperature compensation module (23) uses a high-precision thermistor and is in close contact with the infrared detector (21). The humidity compensation module (22) uses a capacitive humidity sensor and is installed near the air inlet (6).

3. A novel carbon dioxide sensor as claimed in claim 1, wherein, The mounting plate (2) has a symmetrically arranged sliding groove (4) on one side, and the protective shell (3) has a symmetrically arranged guide strip (5) fixedly connected to one side. The guide strip (5) is slidably connected to the inner wall of the sliding groove (4).

4. A novel carbon dioxide sensor as claimed in claim 1, wherein, A waterproof and breathable membrane (12) is provided on one side of the inner wall of the protective shell (3), and the waterproof and breathable membrane (12) is located between the sensor body (1) and the vent (8).

5. A novel carbon dioxide sensor as claimed in claim 1, wherein, The limiting plate (7) has symmetrically arranged connecting grooves (11), and the protective shell (3) has symmetrically arranged connecting seats (10) fixedly connected to one side. The connecting seats (10) are adapted to the connecting grooves (11), and the connecting seats (10) have a positioning groove (14) on one side.

6. A novel carbon dioxide sensor as claimed in claim 5, wherein, The limiting plate (7) is fixedly connected to a symmetrically arranged mounting shell (9) on one side. The inner wall of the mounting shell (9) is slidably provided with a wedge-shaped positioning block (15), which is adapted to the positioning groove (14).

7. A novel carbon dioxide sensor as claimed in claim 6, wherein, A spring (16) is installed on the inner wall of one side of the mounting housing (9). One end of the spring (16) is connected to the outer wall of one side of the positioning block (15). A connecting block (17) is slidably arranged on one side of the mounting housing (9). The connecting block (17) is fixedly connected to the outer wall of one side of the positioning block (15). One end of the connecting block (17) is fixedly connected to the same connecting rod (13).

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