An air quality detection device

Abstract

This utility model relates to the field of ecological environment monitoring technology and discloses an air quality monitoring device, including a housing. A detection component for detecting harmful gases is detachably connected to the upper end of the housing's inner cavity. A suction pipe is interconnected to the top of the housing. A fan is detachably connected to the top of the suction pipe's inner cavity. A PM2.5 / 10 detection module is detachably connected to the bottom of the suction pipe's inner cavity. A filter component for filtering airborne dust particles is detachably installed in the inner cavity of the suction pipe above the PM2.5 / 10 detection module. This utility model can actively introduce air into the detection area during detection and can perform segmented detection to ensure effective detection of different air qualities. It also features automatic cleaning, ensuring autonomous suction and detection performance, reducing the difficulty of use, and improving the device's practicality.

Description

Technical Field

[0001] This utility model relates to the field of ecological environment monitoring technology, specifically an air quality monitoring device. Background Technology

[0002] Ecological and environmental monitoring refers to the detection and assessment of various elements in the natural environment in order to understand the status, changes and influencing factors of the ecosystem. The purpose of ecological and environmental monitoring is to protect and improve the ecological environment and ensure the health and sustainable development of the ecosystem. Ecological and environmental monitoring includes air quality monitoring and atmospheric pollutant monitoring to assess the concentration of pollutants in the air and their impact on the ecosystem.

[0003] An air quality detector is a device that can detect formaldehyde, PM2.5, TVOC, temperature, and humidity in real time to measure air quality. It uses formaldehyde sensors, PM2.5 sensors, TVOC sensors, and temperature and humidity sensors to draw the gas into the device. After the gas is drawn into the device, the weak signals collected by the sensors are amplified by an operational amplifier. Some noise interference is then removed, and after processing by specialized technology, the measurement data can be displayed on the screen in real time to provide a reference for air purification.

[0004] Existing air quality detection devices typically integrate detection modules to ensure diverse air quality monitoring. However, in actual operation, particulate matter exists in the air, and with prolonged use, some dust particles tend to adhere to the surface of the detection module. This not only significantly reduces the sensitivity of the detection module, thereby lowering the accuracy of the detection, but also blocks the gas flow channel, affecting air sampling efficiency. Furthermore, it makes subsequent cleaning difficult, reducing the ease of use of the detection device. Therefore, we propose an air quality detection device. Utility Model Content

[0005] The main objective of this invention is to provide an air quality detection device that can effectively solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an air quality detection device, comprising a housing, a detection component for detecting harmful gases detachably connected to the upper end of the housing cavity, an air intake pipe interconnected to the top of the housing, a fan detachably connected to the top of the air intake pipe cavity, a PM2.5 / 10 detection module detachably connected to the bottom of the air intake pipe cavity, a filter component for filtering dust particles in the air detachably provided in the air intake pipe cavity above the PM2.5 / 10 detection module, and an exhaust pipe interconnected to one side of the housing, with a one-way valve provided in the exhaust pipe cavity.

[0007] Preferably, the detection component includes a gas detection plate, a VOCs detection module, a CO2 detection module, and a temperature and humidity sensing module. The gas detection plate is detachably connected to the upper end of the inner cavity of the housing, and the VOCs detection module, CO2 detection module, and temperature and humidity sensing module are detachably connected to the lower surface of the gas detection plate, respectively.

[0008] Preferably, the filter assembly includes a mounting frame, a filter membrane holder, a filter membrane, a snap-fit ​​hole, and an elastic connecting rod. The mounting frame has a snap-fit ​​hole inside, and the filter membrane holder is nested inside the snap-fit ​​hole. The filter membrane holder has a filter membrane inside, and the top of the snap-fit ​​hole is detachably connected to an elastic connecting rod, the bottom of which abuts against the upper surface of the filter membrane holder.

[0009] Preferably, the lower surface of the filter membrane is coated with a hydrophobic coating, and the hydrophobic coating is a silicon dioxide nano-coating.

[0010] Preferably, a PZT piezoelectric ceramic ring is detachably connected to the lower surface of the filter membrane holder.

[0011] Preferably, the upper surface of the gas detection plate is detachably equipped with a wireless transmission module.

[0012] Preferably, a base plate is fixedly connected to the back of the housing, and fixing bolts are threaded to all four corners of the base plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model's detection component, fan, filter component, PM2.5 / 10 detection module, and PZT piezoelectric ceramic ring work together. During detection, the fan actively introduces outside air into the housing. Upon entering, the air first contacts the PM2.5 / 10 detection module to detect the PM2.5 / 10 content. After detection, the air passes through the filter membrane before entering the housing. The filter membrane prevents dust particles from entering the housing, thus preventing them from adhering to the VOCs detection module, CO2 detection module, and temperature and humidity sensing module. This ensures the sensitivity and accuracy of the VOCs detection module, CO2 detection module, and temperature and humidity sensing module. Simultaneously, utilizing the inverse piezoelectric effect, the PZT piezoelectric ceramic ring generates high-frequency vibrations, emitting ultrasonic waves. These ultrasonic waves act on the filter membrane, causing dust particles adhering to the filter membrane surface to detach due to the high-frequency vibrations, achieving an automatic dust removal function. This effectively extends the filter membrane's service life and reduces the frequency of manual maintenance.

[0015] 2. This utility model utilizes the combination of a PZT piezoelectric ceramic ring and a hydrophobic coating. During subsequent cleaning, the PZT piezoelectric ceramic ring generates high-frequency vibrations, emitting ultrasonic waves. These ultrasonic waves act on the filter membrane, causing dust particles adhering to the filter membrane surface to fall off due to the high-frequency vibrations. Furthermore, the hydrophobic coating prevents the adhesion of wet particles. Combined with the PZT piezoelectric ceramic ring, this further enhances the self-cleaning effect, ensuring autonomous air intake during testing. This effectively improves the air quality detection results, reduces the difficulty of using the testing device, and enhances the practicality of the testing device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a structural schematic diagram of the vertical sectional view of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of utility model A;

[0019] Figure 4 This is a schematic diagram of the structure of the filter membrane of this utility model.

[0020] In the diagram: 1. Base plate; 2. Housing; 3. Fixing bolts; 4. Exhaust pipe; 5. Intake pipe; 6. Wireless transmission module; 7. Gas detection board; 8. VOCs detection module; 9. CO2 detection module; 10. Temperature and humidity sensing module; 11. PM2.5 / 10 detection module; 12. Mounting bracket; 13. Filter membrane holder; 14. PZT piezoelectric ceramic ring; 15. Fan; 16. Snap-fit ​​hole; 17. Elastic connecting rod; 18. Hydrophobic coating; 19. Filter membrane. Detailed Implementation

[0021] 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.

[0022] Example

[0023] Please see Figure 1 - Figure 4The air quality detection device shown in the figure includes a housing 2. A detection component for detecting harmful gases is detachably connected to the upper end of the inner cavity of the housing 2. An air intake pipe 5 is interconnected to the top of the housing 2. A fan 15 is detachably connected to the top of the inner cavity of the air intake pipe 5. A PM2.5 / 10 detection module 11 is detachably connected to the bottom of the inner cavity of the air intake pipe 5. A filter component for filtering dust particles in the air is detachably installed in the inner cavity of the air intake pipe 5 above the PM2.5 / 10 detection module 11. An exhaust pipe 4 is interconnected to one side of the housing 2, and a one-way valve is installed in the inner cavity of the exhaust pipe 4.

[0024] The detection components include a gas detection plate 7, a VOCs detection module 8, a CO2 detection module 9, and a temperature and humidity sensing module 10. The gas detection plate 7 is detachably connected to the upper end of the inner cavity of the housing 2, and the VOCs detection module 8, CO2 detection module 9, and temperature and humidity sensing module 10 are detachably connected to the lower surface of the gas detection plate 7. Through the flexible combination of the VOCs detection module 8, CO2 detection module 9, and temperature and humidity sensing module 10, diverse air quality detection needs can be met, effectively improving the versatility and practicality of the detection device. (The VOCs detection module is based on the gas-sensitive characteristics of semiconductor metal oxides, and detects the concentration by the change in conductivity caused by gas adsorption; the CO detection module adopts the non-dispersive infrared (NDIR) principle, and realizes detection by utilizing the absorption characteristics of CO to infrared light of a specific wavelength; the temperature and humidity sensing module 10 senses changes in ambient humidity and temperature through a polymer capacitive humidity sensing element and a thermistor, respectively. These technologies are all existing technologies and will not be described in detail here.)

[0025] The filtration assembly includes a mounting frame 12, a filter membrane holder 13, a filter membrane, a snap-fit ​​hole 16, and an elastic connecting rod 17. The mounting frame 12 has a snap-fit ​​hole 16 inside, and the filter membrane holder 13 is nested within the snap-fit ​​hole 16. A filter membrane is placed inside the filter membrane holder 13. An elastic connecting rod 17 is detachably connected to the top of the snap-fit ​​hole 16, and the bottom end of the elastic connecting rod 17 abuts against the upper surface of the filter membrane holder 13. A hydrophobic coating 18, which is a silica nano-coating, is applied to the lower surface of the filter membrane holder 13. A PZT piezoelectric ceramic ring 14 is detachably connected to the lower surface of the filter membrane holder 13. The filter membrane is connected to the PZT piezoelectric ceramic ring via the silica nano-hydrophobic coating 18. The ring (PZT piezoelectric ceramic ring operates based on the inverse piezoelectric effect. When an alternating voltage is applied to its two poles, the internal electric dipoles generate periodic rotation and displacement under the action of the electric field, causing the ceramic ring to undergo mechanical expansion and contraction vibration, and output ultrasonic waves with the same frequency as the voltage change frequency (such as 40kHz). When this ultrasonic wave acts on the surface of the filter membrane 19, it removes dust particles through high-frequency vibration, realizing a non-contact self-cleaning function. This technology is existing technology and will not be described in detail here) vibration cleaning structure can effectively remove dust from the surface of the filter membrane 19 while achieving automatic cleaning and preventing wet particles from adhering, effectively improving filtration efficiency and component lifespan.

[0026] The gas detection plate 7 has a detachable wireless transmission module 6 on its upper surface, and a base plate 1 is fixedly connected to the back of the housing 2. Each corner of the base plate 1 is threaded with a fixing bolt 3. By installing the detachable wireless transmission module 6 on the upper surface of the gas detection plate 7 (the wireless transmission module 6 is based on electromagnetic wave theory; it encodes the digital signal output by the gas detection plate 7 using Manchester encoding, modulates it onto a 2.4GHz carrier wave using GFSK, amplifies it with 20dBm power, and then radiates it into space via a PCB loop antenna; the receiving antenna captures the signal and, after low-noise amplification, coherent demodulation, and CRC verification, encapsulates the data according to the MQTT protocol, and then transmits it wirelessly to the cloud server using encrypted (AES-128) data via the TCP / IP protocol stack; this technology is existing and will not be described in detail here), in conjunction with the threaded fixing bolts 3 at the four corners of the base plate 1 on the back of the housing 2, it achieves real-time wireless transmission of detection data and facilitates rapid installation, deployment, and subsequent module upgrades and maintenance, effectively improving the practicality and adaptability of the air quality detection device.

[0027] It should be noted that this utility model is an air quality detection device. The device is installed in the target detection area using fixing bolts 3 at the corners of the base plate 1. After power is connected, the fan 15 is started, actively drawing outside air into the suction pipe 5. Upon entering the suction pipe 5, the air first contacts the PM2.5 / 10 detection module, quickly detecting the PM2.5 / 10 content. Subsequently, the air is further filtered through a filter membrane. The silica nano-hydrophobic coating 18 on the filter membrane effectively intercepts dust particles, preventing them from entering the housing 2 and affecting the detection components. After filtration, the air enters the housing 2, where the VOCs detection module, CO2 detection module, and temperature and humidity sensing module 10 begin operation, accurately detecting the content of corresponding components in the air and ambient temperature and humidity data. The wireless transmission module on the gas detection board 7... Block 6 encodes and processes the data acquired by each detection module and sends it to the receiving terminal via wireless signal. During continuous operation of the device, the PZT piezoelectric ceramic ring can be periodically controlled to generate high-frequency vibration and emit ultrasonic waves using the inverse piezoelectric effect. The ultrasonic waves act on the filter membrane 19, causing the dust particles attached to the surface of the filter membrane 19 to fall off due to high-frequency vibration. Combined with the hydrophobic coating 18 to prevent the adhesion of wet particles, efficient automatic dust removal is achieved, ensuring the air permeability of the filter membrane 19, maintaining the stable autonomous air suction effect and accurate detection capability of the device, and effectively improving the convenience and practicality of the detection device.

[0028] 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.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An air quality detection device comprising a housing (2), characterised in that: The upper end of the inner cavity of the housing (2) is detachably connected to a detection component for detecting harmful gases. The top end of the housing (2) is interconnected with a suction pipe (5). The top end of the inner cavity of the suction pipe (5) is detachably connected to a fan (15). The bottom end of the inner cavity of the suction pipe (5) is detachably connected to a PM2.5 / 10 detection module (11). The inner cavity of the suction pipe (5) above the PM2.5 / 10 detection module (11) is detachably equipped with a filter component for filtering dust particles in the air. The side of the housing (2) is interconnected with an exhaust pipe (4), and the inner cavity of the exhaust pipe (4) is equipped with a one-way valve.

2. The air quality detection device of claim 1, wherein: The detection assembly includes a gas detection plate (7), a VOCs detection module (8), a CO2 detection module (9), and a temperature and humidity sensing module (10). The gas detection plate (7) is detachably connected to the upper end of the inner cavity of the housing (2), and the VOCs detection module (8), CO2 detection module (9), and temperature and humidity sensing module (10) are detachably connected to the lower surface of the gas detection plate (7).

3. The air quality detection device of claim 2, wherein: The filter assembly includes a mounting bracket (12), a filter membrane holder (13), a filter membrane (19), a snap-fit ​​hole (16), and an elastic connecting rod (17). The mounting bracket (12) has a snap-fit ​​hole (16) inside. The filter membrane holder (13) is nested inside the snap-fit ​​hole (16). The filter membrane holder (19) is provided inside the filter membrane holder (13). The elastic connecting rod (17) is detachably connected to the top of the snap-fit ​​hole (16), and the bottom end of the elastic connecting rod (17) abuts against the upper surface of the filter membrane holder (13).

4. The air quality detection device of claim 3, wherein: The lower surface of the filter membrane is coated with a hydrophobic coating (18), and the hydrophobic coating (18) is a silicon dioxide nano-coating.

5. The air quality detection device of claim 3, wherein: A PZT piezoelectric ceramic ring (14) is detachably connected to the lower surface of the filter membrane holder (13).

6. An air quality detection device according to claim 2, characterized in that: The gas detection plate (7) is detachably equipped with a wireless transmission module (6) on its upper surface.

7. The air quality detection device of claim 1, wherein: The back of the housing (2) is fixedly connected to a base plate (1), and the corners of the base plate (1) are all threaded with fixing bolts (3).

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