An intelligent indoor formaldehyde monitoring system based on multi-sensor fusion

Abstract

This utility model discloses an indoor formaldehyde intelligent monitoring system based on multi-sensor fusion, comprising: a base, a detection device rotatably connected to the inner wall of the top of the base, and an air extraction device slidably connected to the inner wall of the top of the detection device; this utility model relates to the field of formaldehyde monitoring technology. The detection device and air extraction device, through the collaborative work of a formaldehyde sensor, a humidity sensor, and a combustible gas sensor, can simultaneously monitor indoor formaldehyde concentration, humidity, and combustible gas content, avoiding the limitations of single-sensor detection. A motor drives the fan blades to rotate at high speed, creating negative pressure to actively draw indoor air in through a first filter, pass it through the sensor, and then discharge it through a second filter. Compared to passive diffusion sampling, this greatly accelerates the gas flow speed, enabling the sensor to quickly contact the gas to be detected.

Description

Technical Field

[0001] This utility model relates to the field of formaldehyde monitoring technology, specifically to an indoor formaldehyde intelligent monitoring system based on multi-sensor fusion. Background Technology

[0002] As people's requirements for the quality of indoor living and working environments continue to increase, indoor air quality testing is becoming increasingly important. Formaldehyde, as a common harmful pollutant in indoor decoration materials and furniture, can cause serious harm to human health if exposed to excessive levels of formaldehyde for a long time.

[0003] Currently, most indoor formaldehyde monitoring devices on the market have limitations. Traditional monitoring devices usually use passive diffusion sampling, which results in slow gas flow, long detection response time, and inability to detect sudden changes in pollutant concentration in a timely manner. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides an indoor formaldehyde intelligent monitoring system based on multi-sensor fusion, which solves the problem of long detection response time caused by the passive diffusion sampling commonly used in traditional monitoring equipment.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An indoor formaldehyde intelligent monitoring system based on multi-sensor fusion includes: a base, a detection device rotatably connected to the inner wall of the top of the base, and an air extraction device slidably connected to the inner wall of the top of the detection device; the detection device includes a triangular frame, a first filter and a display screen fixedly connected to the inner wall of the triangular frame, a triangular support plate fixedly connected to the inner wall of the triangular frame, a humidity sensor, a combustible gas sensor and a formaldehyde sensor symmetrically fixedly connected to the outer wall of the triangular support plate, a rotating shaft fixedly connected to the outer wall of the bottom of the triangular frame, an installation groove formed on the outer wall of the top of the triangular frame, and a threaded hole formed on the inner wall of the top of the installation groove.

[0009] Preferably, the first filter and the display screen are arranged in an array along the inner wall of the triangular frame, with the first filter positioned below the display screen. The first filter filters out impurities such as dust and hair, protecting the internal sensors.

[0010] Preferably, the humidity sensor, combustible gas sensor, and formaldehyde sensor correspond to the positions of the first filter screen. These sensors are connected to the display screen via signal transmission lines. The formaldehyde sensor uses a commercially available ZE07-CH2O sensor from Weisheng. Formaldehyde gas diffuses into the interior through the breathable membrane on the sensor surface. On the working electrode surface, formaldehyde molecules are oxidized, releasing electrons. The electrons generated in the reaction form a current through the external circuit. The magnitude of the current is linearly related to the formaldehyde concentration. The internal circuit of the sensor converts the current signal into a voltage signal, which is then amplified, filtered, and processed before being output as a digital signal to the display screen via the signal transmission line for easy observation of feedback data. The humidity sensor uses a commercially available AHT20 sensor. When the ambient humidity is high... When the humidity changes, the polymer dielectric layer absorbs or releases moisture, causing a change in its dielectric constant. Since the capacitance value is proportional to the dielectric constant, the change in humidity directly translates into a change in capacitance. The capacitance signal is converted into a digital signal by an analog-to-digital converter and output to the display screen via a signal transmission line for easy observation of feedback data. The combustible gas sensor uses a commercially available MQ-5 sensor, which detects combustible gases through the gas adsorption reaction on the surface of a tin dioxide semiconductor. The tin dioxide surface adsorbs oxygen molecules and captures electrons from the semiconductor. These electrons re-enter the conduction band of the semiconductor, causing a decrease in the resistance of the tin dioxide. The change in resistance simulates a voltage signal and is converted into an output signal, which is then output to the display screen via a signal transmission line for easy observation of feedback data.

[0011] Preferably, a suction cup is fixedly connected to the outer wall of the bottom of the base, the inner wall of the top of the base is rotatably connected to the outer wall of the rotating shaft, the suction cup at the bottom of the base fixes the device to ensure stable detection position, and the rotating shaft is rotatably connected to the base, allowing for manual rotation and easy observation of the index of each sensor.

[0012] Preferably, the air extraction device includes an air extraction cylinder, with screws slidably connected to the inner wall of the air extraction cylinder, support frames symmetrically fixedly connected to the inner wall of the air extraction cylinder, a motor fixedly connected to the inner wall of the support frame, a rotating rod rotatably connected to the inner wall of the motor, fan blades fixedly connected to the outer wall of the rotating rod, and a second filter screen fixedly connected to the outer wall of the bottom of the air extraction cylinder.

[0013] Preferably, the outer wall of the suction cylinder is slidably connected to the inner wall of the mounting groove, and the outer wall of the screw is threadedly connected to the inner wall of the threaded hole. When it is necessary to disassemble and maintain the suction device, turn the screw to make it exit from the threaded hole, thereby disconnecting the suction cylinder from the triangular frame. Then, slide the suction cylinder upward along the mounting groove and pull it out. The reverse is also true.

[0014] (III) Beneficial Effects

[0015] This invention provides an intelligent indoor formaldehyde monitoring system based on multi-sensor fusion. It has the following beneficial effects:

[0016] (I) This detection device, through the collaborative operation of formaldehyde, humidity, and combustible gas sensors, can simultaneously monitor indoor formaldehyde concentration, humidity, and combustible gas content. This avoids the limitations of single-sensor detection, significantly improving the accuracy and reliability of the results and providing users with comprehensive and accurate indoor air quality data. Furthermore, the device is rotatably connected to the base via a rotating shaft, allowing for manual adjustment of its orientation. This facilitates observation of the sensor readings on the display screen at different angles, making data reading more convenient and enhancing the user experience.

[0017] (II) This air extraction device uses a motor to drive the fan blades to rotate at high speed to create negative pressure, actively drawing indoor air in through the first filter, passing it through the sensor, and then expelling it through the second filter. Compared with passive diffusion sampling, this greatly accelerates the gas flow speed, allowing the sensor to quickly contact the gas to be detected, effectively shortening the response time. At the same time, the screw is connected to the triangular frame of the detection device. When the air extraction device needs to be disassembled for maintenance, simply turn the screw to pull it out of the threaded hole, and the air extraction cylinder can be pulled out along the mounting groove. The installation is the reverse operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a partial cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the triangular frame structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the triangular support plate of this utility model;

[0022] Figure 5 This is a schematic diagram of the formaldehyde sensor of this utility model;

[0023] Figure 6 This is a schematic diagram of the air extraction device of this utility model.

[0024] In the diagram: 1. Base; 11. Suction cup; 2. Detection device; 21. Triangular frame; 22. First filter screen; 23. Display screen; 24. Triangular support plate; 25. Humidity sensor; 26. Combustible gas sensor; 27. Formaldehyde sensor; 28. Rotating shaft; 29. ​​Mounting groove; 291. Threaded hole; 3. Air extraction device; 31. Air extraction cylinder; 32. Screw; 33. Support frame; 34. Motor; 35. Rotating rod; 36. Fan blade; 37. Second filter screen. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-6 This utility model provides a technical solution: an indoor formaldehyde intelligent monitoring system based on multi-sensor fusion, comprising: a base 1, a detection device 2 rotatably connected to the inner wall of the top of the base 1, and an air extraction device 3 slidably connected to the inner wall of the top of the detection device 2; the detection device 2 includes a triangular frame 21, a first filter 22 and a display screen 23 fixedly connected to the inner wall of the triangular frame 21, a triangular support plate 24 fixedly connected to the inner wall of the triangular frame 21, a humidity sensor 25, a combustible gas sensor 26 and a formaldehyde sensor 27 symmetrically fixedly connected to the outer wall of the triangular support plate 24, a rotating shaft 28 fixedly connected to the outer wall of the bottom of the triangular frame 21, an installation groove 29 opened on the outer wall of the top of the triangular frame 21, and a threaded hole 291 opened on the inner wall of the top of the installation groove 29.

[0027] The first filter 22 and the display screen 23 are arranged in an array along the inner wall of the triangular frame 21. The first filter 22 is located below the display screen 23. The first filter 22 filters dust, hair and other impurities to protect the internal sensors.

[0028] Humidity sensor 25, combustible gas sensor 26, and formaldehyde sensor 27 correspond to the positions of the first filter 22. These sensors are connected to the display screen 23 via signal transmission lines. Formaldehyde sensor 27 uses a commercially available ZE07-CH2O sensor from Weisheng. Formaldehyde gas diffuses into the sensor through the breathable membrane on its surface. On the working electrode surface, formaldehyde molecules are oxidized, releasing electrons. The electrons generated in the reaction form a current through the external circuit. The magnitude of the current is linearly related to the formaldehyde concentration. The internal circuit of the sensor converts the current signal into a voltage signal, which is then amplified, filtered, and processed before being output as a digital signal to the display screen 23 via the signal transmission line for easy observation of feedback data. Humidity sensor 25 uses a commercially available AHT20 sensor. When... When the ambient humidity changes, the polymer dielectric layer absorbs or releases moisture, causing a change in its dielectric constant. Since the capacitance value is proportional to the dielectric constant, the change in humidity is directly converted into a change in capacitance. The capacitance signal is converted into a digital signal by an analog-to-digital converter and output to the display screen 23 through a signal transmission line for easy observation of feedback data. The combustible gas sensor 26 uses a commercially available MQ-5 sensor, which detects combustible gas through the gas adsorption reaction on the surface of a tin dioxide semiconductor. The tin dioxide surface adsorbs oxygen molecules and captures electrons from the semiconductor. These electrons re-enter the conduction band of the semiconductor, causing a decrease in the resistance of the tin dioxide. The change in resistance value is used to simulate a voltage signal and is converted into an output signal. The digital signal is output to the display screen 23 through a signal transmission line for easy observation of feedback data.

[0029] A suction cup 11 is fixedly connected to the outer wall of the bottom of the base 1. The inner wall of the top of the base 1 is rotatably connected to the outer wall of the rotating shaft 28. The suction cup 11 at the bottom of the base 1 fixes the device to ensure the stability of the detection position. The rotating shaft 28 is rotatably connected to the base 1, and can be rotated manually to facilitate observation of the index of each sensor.

[0030] The air extraction device 3 includes an air extraction cylinder 31. A screw 32 is slidably connected to the inner wall of the air extraction cylinder 31. A support frame 33 is symmetrically fixed to the inner wall of the air extraction cylinder 31. A motor 34 is fixedly connected to the inner wall of the support frame 33. A rotating rod 35 is rotatably connected to the inner wall of the motor 34. A fan blade 36 is fixedly connected to the outer wall of the rotating rod 35. A second filter screen 37 is fixedly connected to the outer wall at the bottom of the air extraction cylinder 31.

[0031] The outer wall of the vacuum pump 31 is slidably connected to the inner wall of the mounting groove 29, and the outer wall of the screw 32 is threadedly connected to the inner wall of the threaded hole 291. When it is necessary to disassemble and maintain the vacuum device 3, turn the screw 32 to make it exit from the threaded hole 291, thereby disconnecting the vacuum pump 31 from the triangular frame 21. Then, slide the vacuum pump 31 upward along the mounting groove 29 and pull it out. The reverse is also true.

[0032] In use, the suction cup 11 at the bottom of the base 1 fixes the device to ensure a stable detection position. The detection device 2 is rotatably connected to the base 1 via the rotating shaft 28 and can be rotated manually to facilitate observation of the readings of each sensor. The fan blades 36 on the air extraction device 3 rotate to create negative pressure, drawing indoor air in through the first filter 22 and then through the detection device 2 to the second filter 37. The first filter 22 filters out dust, hair, and other impurities to protect the internal sensors.

[0033] When the motor 34 on the support frame 33 starts, it drives the rotating rod 35 and the fan blade 36 to rotate at high speed, forming an airflow channel in the air extraction cylinder 31. Air is drawn in from the first filter screen 22, passes through the formaldehyde sensor 27, humidity sensor 25, and combustible gas sensor 26 on the triangular support plate 24 and comes into contact with them, and then enters from the second filter screen 37 at the bottom of the air extraction cylinder 31. After being accelerated by the fan blade 36, it flows upward and is discharged. When it is necessary to disassemble and maintain the air extraction device 3, turn the screw 32 to make it come out from the threaded hole 291, which will disconnect the air extraction cylinder 31 from the triangular frame 21. Then, slide the air extraction cylinder 31 upward along the mounting groove 29 and pull it out. The reverse is also true.

[0034] The filtered air comes into contact with the formaldehyde sensor 27, humidity sensor 25, and combustible gas sensor 26 on the triangular support plate 24. Each sensor independently collects signals. The formaldehyde sensor 27 converts the formaldehyde concentration into a current signal through an electrochemical reaction, which is then converted into a voltage signal by the internal circuit and output as a digital value to the display screen 23. The humidity sensor 25 uses the capacitive principle to convert humidity changes into capacitance values, which are then converted into digital signals by an ADC and output synchronously to the display screen 23. The combustible gas sensor 26 converts the combustible gas concentration into an analog voltage signal through the change in the resistance of the tin dioxide semiconductor, which is then converted into a digital signal and output to the display screen 23. The triangular frame 21 rotates on the base 1 via the pivot 28, and its direction can be manually adjusted for easy data reading.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-sensor fusion-based indoor formaldehyde intelligent monitoring system, characterized in that, include: A base (1) is rotatably connected to the inner wall of the top of the base (1), and an air extraction device (3) is slidably connected to the inner wall of the top of the detection device (2). The detection device (2) includes a triangular frame (21). A first filter screen (22) and a display screen (23) are fixedly connected to the inner wall of the triangular frame (21). A triangular support plate (24) is fixedly connected to the inner wall of the triangular frame (21). A humidity sensor (25), a combustible gas sensor (26), and a formaldehyde sensor (27) are symmetrically fixedly connected to the outer wall of the triangular support plate (24). A rotating shaft (28) is fixedly connected to the outer wall at the bottom of the triangular frame (21). An installation groove (29) is opened on the outer wall at the top of the triangular frame (21). A threaded hole (291) is opened on the inner wall at the top of the installation groove (29).

2. The indoor formaldehyde intelligent monitoring system based on multi-sensor fusion according to claim 1, characterized in that: The first filter (22) and the display screen (23) are arranged in an array along the inner wall of the triangular frame (21), and the first filter (22) is located below the display screen (23).

3. The indoor formaldehyde intelligent monitoring system based on multi-sensor fusion according to claim 1, characterized in that: The humidity sensor (25), combustible gas sensor (26) and formaldehyde sensor (27) are positioned corresponding to the first filter (22), and are connected to the display screen (23) via signal transmission lines.

4. The indoor formaldehyde intelligent monitoring system based on multi-sensor fusion according to claim 1, characterized in that: A suction cup (11) is fixedly connected to the outer wall of the bottom of the base (1), and the inner wall of the top of the base (1) is rotatably connected to the outer wall of the rotating shaft (28).

5. The indoor formaldehyde intelligent monitoring system based on multi-sensor fusion according to claim 1, characterized in that: The air extraction device (3) includes an air extraction cylinder (31), with screws (32) slidably connected to the inner wall of the air extraction cylinder (31), and support frames (33) symmetrically fixedly connected to the inner wall of the air extraction cylinder (31). A motor (34) is fixedly connected to the inner wall of the support frame (33), and a rotating rod (35) is rotatably connected to the inner wall of the motor (34). A fan blade (36) is fixedly connected to the outer wall of the rotating rod (35), and a second filter screen (37) is fixedly connected to the outer wall of the bottom of the air extraction cylinder (31).

6. The multi-sensor fusion-based indoor formaldehyde intelligent monitoring system according to claim 5, characterized in that: The outer wall of the vacuum pump (31) is slidably connected to the inner wall of the mounting groove (29), and the outer wall of the screw (32) is threadedly connected to the inner wall of the threaded hole (291).

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