Room type multi-parameter air quality sensor

Abstract

The invention discloses a room type multi-parameter air quality sensor, and belongs to the technical field of air detection, the room type multi-parameter air quality sensor comprises a filtering part, the filtering part comprises a sensor main body, the sensor main body is provided with a display screen, and the bottom of the sensor main body is provided with an air inlet groove; a filter screen used for filtering large-particle impurities in the environment is arranged in the air inlet groove, a plurality of filter holes are evenly formed in the filter screen, the particle attachment amount on a sensitive element is detected in a non-contact mode, when the particle attachment amount reaches a set threshold value, the dust removal process is automatically triggered, the filter screen vibrates through rotation of a cam, and impurities and dust on the filter screen are removed; the device is simple in structure and convenient to operate, manual intervention is not needed, the situation that when a filter screen is blocked and stops working, air and PM2.5 and other small particles in the air enter a detection cavity, and the detection result of the device is affected is prevented, the air pump is closed while the motor is started, dust removal power is provided, airflow is blocked, dust is prevented from being raised by the airflow for the second time during dust removal, and the dust removal efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of air detection technology, and more specifically, to a room-type multi-parameter air quality sensor. Background Technology

[0002] The multi-parameter air quality sensor is an online miniature air environment comprehensive index monitor that can simultaneously detect parameters such as PM2.5, PM1.0, PM10, carbon dioxide (CO2), formaldehyde (CH2O), temperature, humidity, and VOCs in the air environment, basically covering all indicators reflecting air quality. It is an air quality monitoring terminal that supports RS485 communication and can be widely used in residential, commercial, and public places. The sensor and computing chip used in the instrument have the characteristics of high precision, high resolution, and good stability. In precision detection equipment such as laser sensors and particle detectors, the cleanliness of the sensitive elements (such as laser emitters and receivers) inside the detection cavity is the core element to ensure detection accuracy.

[0003] However, existing technologies often face the following key problems in practical applications: the cleaning of filters in traditional sensors often relies on manual periodic operation, which not only consumes labor costs, but also makes it difficult to accurately control the timing of cleaning, resulting in the filter being easily clogged due to particle accumulation, which hinders air and target detection particles from entering the detection chamber, directly affecting the representativeness of the detection sample and the accuracy of the data.

[0004] Regarding the aforementioned technologies, the inventors believe that by using non-contact particle detection and a multi-stage linkage dust removal and purging mechanism, precise removal of particles from the detection chamber and maintenance of a continuously clean environment can be achieved.

[0005] In view of this, we propose a room-type multi-parameter air quality sensor. Summary of the Invention

[0006] 1. Technical problems to be solved

[0007] The purpose of this application is to provide a room-type multi-parameter air quality sensor that solves the technical problems mentioned in the background art.

[0008] 2. Technical Solution

[0009] This application provides a room-type multi-parameter air quality sensor, including a filter component. The sensor body has a display screen, an air inlet groove at its bottom, and a filter screen for filtering large particles of impurities in the environment. The filter screen has a plurality of uniformly distributed filter holes. A vibration assembly for vibrating the filter screen is located on the side of the filter screen. A first sliding groove is located inside the sensor body, and a detection chamber is located inside the sensor body. A sensitive element for detecting air quality is located inside the detection chamber. An exhaust assembly for drawing air in from the outside is also located inside the sensor body.

[0010] The purging component includes a barrier assembly disposed inside the sensor body, a brush for cleaning dust from the top of the filter screen disposed inside the air inlet slot, a drive assembly for moving the brush disposed inside the sensor body, a gas storage assembly for storing and compressing gas disposed inside the sensor body, an air bladder disposed inside the gas storage assembly, and a nozzle for purging the sensitive element disposed on the brush.

[0011] By adopting the above technical solution, the filter hole design combines filtration function with the function of facilitating the discharge of internal dust, preventing external particles from re-entering the detection chamber and ensuring the cleanliness of the internal environment.

[0012] As an optional solution to the technical solution of this application, the filter hole is tapered in shape, the detection cavity is an isosceles trapezoid in cross-section, the detection cavity is located above the air inlet groove and the filter screen, and the air inlet groove and the detection cavity are connected.

[0013] By adopting the above technical solution, the upper part of the detection chamber and the lower part of the filter hole have a larger structure, which will gradually increase the flow velocity when the air is discharged, enhance the carrying capacity of dust particles, and effectively prevent particles from circulating or being deposited again in the detection chamber.

[0014] As an optional solution to the technical solution of this application, the vibration component includes a motor installed inside the sensor body, a drive gear connected to the motor, a driven gear meshing with the side of the drive gear, a cam fixedly connected to the driven gear, slide plates fixedly connected to both sides of the filter screen, and a first elastic element provided below the slide plates.

[0015] By adopting the above technical solution, the filter screen is vibrated by the rotation of the cam to remove impurities and dust from the filter screen without manual intervention. This prevents the filter screen from becoming clogged and blocking the air during operation, as well as preventing fine particles such as PM2.5 in the air from entering the detection chamber and affecting the detection results of the device.

[0016] As an optional solution to the technical solution of this application, the exhaust assembly includes a guide groove disposed inside the sensor body, an air pump for air intake disposed inside the guide groove, an exhaust groove disposed on the side of the sensor body, the interior of the guide groove communicating with the interior of the detection chamber, and the exhaust groove communicating with the guide groove.

[0017] By adopting the above technical solution, the air pump and guide slot facilitate the discharge of the tested air from the exhaust slot.

[0018] As an optional solution to the technical solution of this application, the blocking component includes a second sliding groove disposed inside the sensor body, a toothed plate slidably connected inside the second sliding groove, a partition plate fixedly connected to the side of the toothed plate, a second elastic element disposed on the side of the toothed plate, a first diaphragm disposed on the side of the partition plate for separating the second sliding groove and the guide groove, and a second diaphragm disposed on the side of the brush.

[0019] By adopting the above technical solution, the air pump is turned off while the motor is started, which provides cleaning power and blocks the airflow, preventing dust from being re-raised by the airflow during cleaning and improving cleaning efficiency.

[0020] As an optional solution to the technical solution of this application, the toothed plate is elastically connected to the inner wall of the second slide groove through the second elastic element, the bottom of the toothed plate meshes with the drive gear, the partition extends through the inner wall of the second slide groove to the side of the guide groove, the brush is slidably connected to the inner wall of the detection chamber, and a first diaphragm is provided on the side of the brush.

[0021] By adopting the above technical solution, the diaphragm is used to prevent dust from entering the inside of the chute and causing damage to the mechanical structure.

[0022] As an optional solution to the technical solution of this application, the driving component includes a third slide groove provided inside the sensor body, a bidirectional reciprocating lead screw provided in the third slide groove, a sleeve slidably sleeved on the bidirectional reciprocating lead screw, a lead screw nut rotatably connected inside the sleeve, a pressure plate fixedly connected to the sleeve, a piston rod fixedly connected to the side of the pressure plate, and the side of the bidirectional reciprocating lead screw connected to a drive gear for driving its rotation.

[0023] By adopting the above technical solution, the sleeve can drive the brush and pressure plate to reciprocate through the cooperation of the bidirectional reciprocating screw and the screw nut on the sleeve.

[0024] As an optional solution to the technical solution of this application, the pressure plate is slidably connected to the third slide groove, the brush extends through the inner wall of the detection cavity to the interior of the third slide groove, the brush is fixedly connected to the sleeve, and a first diaphragm for separating the air inlet groove and the third slide groove is provided on the side of the brush.

[0025] By adopting the above technical solution, the nozzle moves with the brush, so the nozzle can move along the sensitive element to blow away the dust attached to the entire sensitive element.

[0026] As an optional solution to the technical solution of this application, the gas storage assembly includes a gas storage tank disposed inside the sensor body, an air inlet disposed on the side of the sensor body, a one-way valve disposed inside the air inlet, a guide groove disposed inside the sensor body, and a gas delivery pipe disposed inside the sensor body.

[0027] By adopting the above technical solution, the pressure plate performs venting and gas storage on both sides when the sleeve moves.

[0028] As an optional solution to the technical solution of this application, a one-way valve is provided inside the guide groove, the air supply pipe is made of elastic telescopic tube, the two ends of the air supply pipe are respectively connected to the guide groove and the nozzle, the air bag is located on the side of the pressure plate away from the piston rod, the piston rod is slidably connected to the air storage tank, and the two sides of the air bag are respectively connected to the one-way valve and the guide groove.

[0029] By adopting the above technical solution, the nozzle can continuously purge the sensitive element when the sleeve reciprocates.

[0030] 3. Beneficial effects

[0031] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0032] 1. By non-contactly detecting the amount of particles attached to the sensitive element, the cleaning process is automatically triggered when the accumulated amount reaches a set threshold. The cam rotation causes the filter screen to vibrate and remove impurities and dust from the filter screen without manual intervention. This prevents the filter screen from clogging and blocking the air during operation, as well as preventing fine particles such as PM2.5 from entering the detection chamber and affecting the detection results of the device. At the same time as starting the motor, the air pump is turned off, which provides cleaning power while blocking the airflow, preventing dust from being re-raised by the airflow during cleaning and improving cleaning efficiency.

[0033] 2. During the above-mentioned vibration cleaning process, the brush will simultaneously reciprocate along the axial direction of the lead screw in the air inlet groove to clean the top of the filter screen. The dust falling on the top of the filter screen will be discharged through the filter holes under the sweeping of the brush. The combination of brush sweeping and filter screen vibration cleaning can further improve the cleaning effect and efficiency of the device.

[0034] 3. During the brush cleaning process described above, the nozzle will simultaneously spray the air stored in the airbag to blow away the sensitive element. Since the nozzle moves with the brush, it can move along the sensitive element to blow away the dust attached to the entire sensitive element, thus avoiding errors in the detection data caused by partial obstruction and the situation where the laser sensor detection data is too high due to dust attached to the sensitive element.

[0035] 4. Simultaneously, during the process of the nozzle purging dust from the sensitive element, the air storage component and airbag work together to ensure that the nozzle can continuously purge the sensitive element during both movement and resetting, preventing dust accumulation and ensuring detection accuracy. Particles on the sensitive element and in the detection chamber are discharged through the conical filter holes under continuous air pressure and airflow. The upper part of the detection chamber and the lower part of the filter holes have a larger structure. When the gas flows through the contraction section, the flow velocity increases because the flow rate is inversely proportional to the cross-sectional area of ​​the channel. This causes the flow velocity to gradually increase during discharge, accelerating gas discharge. The accelerated airflow reduces the internal pressure, enhancing the dust-carrying capacity and effectively preventing particles from circulating or secondary depositing in the detection chamber. It also carries away dust particles from the filter holes, further improving the cleaning effect on the filter screen. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a three-dimensional structural diagram of a room-type multi-parameter air quality sensor.

[0038] Figure 2 This is a schematic diagram of the structure of a room-type multi-parameter air quality sensor viewed from below.

[0039] Figure 3 This is a schematic diagram of the cross-sectional structure of the exhaust assembly of a room-type multi-parameter air quality sensor.

[0040] Figure 4 Room-type multi-parameter air quality sensor Figure 3 Enlarged structural diagram at point A in the middle.

[0041] Figure 5 This is a schematic diagram of the cross-sectional structure of the second slide of a room-type multi-parameter air quality sensor.

[0042] Figure 6 This is a schematic diagram showing the structural relationship between the partition and the guide groove of a room-type multi-parameter air quality sensor.

[0043] Figure 7 This is a schematic diagram of the cross-sectional structure of the barrier component of a room-type multi-parameter air quality sensor.

[0044] Figure 8 This is a schematic cross-sectional view of the drive assembly of a room-type multi-parameter air quality sensor.

[0045] Figure 9 This is a schematic diagram of the cross-sectional structure of the gas storage component of a room-type multi-parameter air quality sensor.

[0046] Figure 10 This is a three-dimensional structural diagram of the vibration component of a room-type multi-parameter air quality sensor.

[0047] Figure 11 This is a schematic diagram showing the structural relationship between the nozzle and the brush of a room-type multi-parameter air quality sensor.

[0048] Figure 12 This is a schematic diagram of the internal structure of the sleeve of a room-type multi-parameter air quality sensor.

[0049] Figure labeling: 10. Sensor body; 11. Display screen; 12. Air inlet slot; 13. Filter screen; 14. Filter holes; 15. Vibration assembly; 151. Motor; 152. Drive gear; 153. Driven gear; 154. Cam; 155. Slide plate; 156. First elastic element; 16. First slide groove; 17. Detection chamber; 18. Sensing element; 19. Exhaust assembly; 191. Guide groove; 192. Air pump; 193. Exhaust groove; 20. Barrier assembly; 201. Second slide groove 202. Groove; 203. Toothed plate; 204. Partition plate; 205. Second elastic element; 206. First diaphragm; 207. Second diaphragm; 21. Brush; 22. Drive assembly; 221. Bidirectional reciprocating screw; 222. Sleeve; 223. Screw nut; 224. Pressure plate; 225. Piston rod; 226. Third slide groove; 23. Air storage assembly; 231. Air storage tank; 232. Air inlet; 233. One-way valve; 234. Guide groove; 235. Air supply pipe; 24. Airbag; 25. Nozzle. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Reference Figures 1 to 12 This application provides a room-type multi-parameter air quality sensor, including a filter component, which includes a sensor body 10, a display screen 11 on the sensor body 10, an air inlet groove 12 at the bottom of the sensor body 10, a filter screen 13 for filtering large particulate impurities in the environment inside the air inlet groove 12, a plurality of filter holes 14 evenly opened on the filter screen 13, a vibration component 15 for vibrating the filter screen 13 on the side, a first sliding groove 16 inside the sensor body 10, a detection chamber 17 inside the sensor body 10, a sensitive element 18 for detecting air quality inside the detection chamber 17, and an exhaust component 19 for drawing in air from the outside inside the sensor body 10.

[0054] The blowing component includes a barrier component 20 disposed inside the sensor body 10, a brush 21 disposed inside the air inlet 12 for cleaning dust on the top of the filter screen 13, a drive component 22 disposed inside the sensor body 10 for driving the brush 21 to move, a gas storage component 23 disposed inside the sensor body 10 for storing and compressing gas, an air bladder 24 disposed inside the gas storage component 23, and a nozzle 25 disposed on the brush 21 for blowing the sensitive element 18.

[0055] The filter hole 14 is tapered in shape, and the detection chamber 17 has an isosceles trapezoidal cross-section. The detection chamber 17 is located above the air inlet slot 12 and the filter screen 13. The air inlet slot 12 and the detection chamber 17 are connected. A laser sensor for detecting PM2.5 is installed inside the detection chamber 17. The horizontal position of the laser sensor is located above the nozzle 25.

[0056] The vibration assembly 15 includes a motor 151 installed inside the sensor body 10. A drive gear 152 is connected to the motor 151. A driven gear 153 meshes with the side of the drive gear 152. A cam 154 is fixedly connected to the driven gear 153. Slide plates 155 are fixedly connected to both sides of the filter screen 13. A first elastic element 156 is provided below the slide plate 155. The slide plate 155 extends through the inner wall of the air intake groove 12 to the inside of the first slide groove 16. The bottom of the slide plate 155 is elastically connected to the inner wall of the first slide groove 16 through the first elastic element 156. The bottom of the cam 154 abuts against the top of the slide plate 155. The size of the drive gear 152 is twice the size of the driven gear 153.

[0057] The exhaust assembly 19 includes a guide groove 191 provided inside the sensor body 10, an air pump 192 for air intake is provided inside the guide groove 191, an exhaust groove 193 is provided on the side of the sensor body 10, the inside of the guide groove 191 communicates with the inside of the detection chamber 17, and the exhaust groove 193 communicates with the guide groove 191.

[0058] Reference Figures 4 to 12 This application provides a room-type multi-parameter air quality sensor. The barrier component 20 includes a second slide groove 201 disposed within the sensor body 10. A toothed plate 202 is slidably connected inside the second slide groove 201. A partition 203 is fixedly connected to the side of the toothed plate 202. A second elastic element 204 is disposed on the side of the toothed plate 202. A first diaphragm 205 for separating the second slide groove 201 from the guide groove 191 is disposed on the side of the partition 203. The toothed plate 202 is elastically connected to the inner wall of the second slide groove 201 through the second elastic element 204. The bottom of the toothed plate 202 meshes with the drive gear 152. The partition 203 extends through the inner wall of the second slide groove 201 to the side of the guide groove 191. A brush 21 is slidably connected to the inner wall of the detection chamber 17. A first diaphragm 205 and a second diaphragm 206 are disposed on the side of the brush 21.

[0059] The drive assembly 22 includes a third slide groove 226 disposed within the sensor body 10. A bidirectional reciprocating lead screw 221 is disposed within the third slide groove 226. A sleeve 222 is slidably sleeved on the bidirectional reciprocating lead screw 221. A lead screw nut 223 is rotatably connected inside the sleeve 222. A pressure plate 224 is fixedly connected to the sleeve 222. A piston rod 225 is fixedly connected to the side of the pressure plate 224. The pressure plate 224 is slidably connected to the third slide groove 226. A brush 21 extends through the inner wall of the detection chamber 17 into the interior of the third slide groove 226. The brush 21 is fixedly connected to the sleeve 222. A first diaphragm 205 is disposed on the side of the brush 21 to separate the air inlet groove 12 from the third slide groove 226. The side of the bidirectional reciprocating lead screw 221 is connected to a drive gear 152 for driving its rotation.

[0060] The gas storage assembly 23 includes a gas storage tank 231 inside the sensor body 10, an air inlet 232 on the side of the sensor body 10, a one-way valve 233 inside the air inlet 232, a guide groove 234 inside the sensor body 10, an air supply pipe 235 inside the sensor body 10, a one-way valve 233 inside the guide groove 234, the air supply pipe 235 is made of elastic telescopic tube, and both ends of the air supply pipe 235 are connected to the guide groove 234 and the nozzle 25, respectively. The air bag 24 is located on the side of the pressure plate 224 away from the piston rod 225. The piston rod 225 is slidably connected to the gas storage tank 231. Both sides of the air bag 24 are connected to the one-way valve 233 and the guide groove 234, respectively.

[0061] This application provides a room-type multi-parameter air quality sensor, the working principle and usage process of which are as follows:

[0062] When the sensor body 10 is working, the air pump 192 draws in air from below, allowing outside air to enter the detection chamber 17 through the air inlet 12 and filter 13. Larger particles in the air are filtered out by the filter 13. The filtered air then enters the detection chamber 17 and is detected by the sensitive element 18 and the laser sensor inside the detection chamber 17. The detected data is processed and displayed on the display screen 11. When the laser sensor detects a large number of particles attached to the sensitive element 18, it outputs an electrical signal to the controller, causing the controller to start the motor 151 and shut down the air pump. 192. When the motor 151 starts, the drive gear 152 will rotate. The rotation of the drive gear 152 will drive the toothed plate 202, which meshes with it, to move closer to the second elastic member 204 inside the second slide groove 201, compressing the second elastic member 204 and driving the partition plate 203 to move. When the guide groove 191 is blocked inside, the toothed plate 202 will move to the position where the drive gear 152 is disengaged. The tooth groove on the side of the toothed plate 202 away from the second elastic member 204 will always be abutted against the rotating drive gear 152 under the action of the elastic force of the second elastic member 204.

[0063] When the drive gear 152 rotates, it drives the driven gear 153 that meshes with it to rotate. The rotation of the driven gear 153 drives the cam 154 to rotate. When the protruding part on the cam 154 rotates to abut against the slide plate 155, it will press the slide plate 155 downward, causing it to move downward in the first slide groove 16 and press against the first elastic member 156. When the protruding part on the cam 154 rotates to release from abutment against the slide plate 155, the slide plate 155 will move upward under the action of the elastic force of the first elastic member 156. This cycle repeats, causing the filter screen 13 connected to the slide plate 155 to vibrate, thereby removing impurities and dust from the filter screen 13.

[0064] When the drive gear 152 rotates, it will also drive the bidirectional reciprocating screw 221 fixedly connected to it to rotate. The rotation of the bidirectional reciprocating screw 221 will drive the sleeve 222 that is matched with it to reciprocate along the axis of the screw through the bidirectional thread groove on it, thereby driving the brush 21 to reciprocate along the axis of the screw in the air inlet groove 12 to clean the top of the filter screen 13.

[0065] Simultaneously, when the sleeve 222 moves, it will drive the pressure plate 224 to move in the third slide groove 226. The movement of the pressure plate 224 will drive the piston rod 225 to move in the air storage groove 231, and generate negative pressure in the screw nut 223. Through the negative pressure, the external air enters the air storage groove 231 through the one-way valve 233 in the air inlet 232 for air storage. The movement of the pressure plate 224 will also squeeze the air bag 24, so that the air inside it enters the air supply pipe 235 through the one-way valve 233 in the guide groove 234, and finally blows it from the nozzle 25 to the sensitive element 18 to purge the sensitive element 18. Since the nozzle 25 moves with the brush 21, the sensitive element 18 can be thoroughly purged.

[0066] When the sleeve 222 moves back on the bidirectional reciprocating screw 221 to reset, it compresses the air in the air storage tank 231 through the piston rod 225, causing it to be ejected from the nozzle 25 through the one-way valve 233 in the guide groove 234. The pressure plate 224 stretches the air bag 24, causing it to draw in air through the one-way valve 233 in the air inlet 232 for air storage. This allows the nozzle 25 to continuously purge the sensitive element 18 during both the movement and reset processes, causing particles on the sensitive element 18 and in the detection chamber 17 to pass through the conical filter hole 14 and be discharged under the action of continuous air pressure and airflow.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A room-type multi-parameter air quality sensor, characterized in that: include, The filter component includes a sensor body (10), a display screen (11) on the sensor body (10), an air inlet groove (12) at the bottom of the sensor body (10), a filter screen (13) for filtering large particulate impurities in the environment inside the air inlet groove (12), a plurality of filter holes (14) evenly opened on the filter screen (13), a vibration component (15) for vibrating the filter screen (13) on the side of the filter screen (13), a first sliding groove (16) inside the sensor body (10), a detection chamber (17) inside the sensor body (10), a sensitive element (18) for detecting air quality inside the detection chamber (17), and an exhaust component (19) for drawing air from the outside inside the sensor body (10). The blowing component includes a barrier assembly (20) disposed inside the sensor body (10), a brush (21) for cleaning dust on the top of the filter screen (13) disposed inside the air inlet slot (12), a drive assembly (22) for driving the brush (21) to move disposed inside the sensor body (10), a gas storage assembly (23) for storing and compressing gas disposed inside the sensor body (10), an air bladder (24) disposed inside the gas storage assembly (23), and a nozzle (25) for blowing the sensitive element (18) disposed on the brush (21).

2. The room-type multi-parameter air quality sensor according to claim 1, characterized in that: The filter hole (14) is conical in shape, and the cross-section of the detection cavity (17) is an isosceles trapezoid. The detection cavity (17) is located above the air inlet groove (12) and the filter screen (13). The air inlet groove (12) and the detection cavity (17) are connected.

3. The room-type multi-parameter air quality sensor according to claim 1, characterized in that: The vibration assembly (15) includes a motor (151) installed inside the sensor body (10), a drive gear (152) connected to the motor (151), a driven gear (153) meshing with the side of the drive gear (152), a cam (154) fixedly connected to the driven gear (153), a slide plate (155) fixedly connected to both sides of the filter screen (13), and a first elastic element (156) provided below the slide plate (155).

4. The room-type multi-parameter air quality sensor according to claim 3, characterized in that: The exhaust assembly (19) includes a guide groove (191) provided inside the sensor body (10), an air pump (192) for air intake is provided inside the guide groove (191), an exhaust groove (193) is provided on the side of the sensor body (10), the inside of the guide groove (191) is connected to the inside of the detection chamber (17), and the exhaust groove (193) is connected to the guide groove (191).

5. The room-type multi-parameter air quality sensor according to claim 3, characterized in that: The blocking component (20) includes a second slide groove (201) provided inside the sensor body (10), a toothed plate (202) is slidably connected inside the second slide groove (201), a partition plate (203) is fixedly connected to the side of the toothed plate (202), a second elastic element (204) is provided on the side of the toothed plate (202), a first diaphragm (205) for separating the second slide groove (201) and the guide groove (191) is provided on the side of the partition plate (203), and a second diaphragm (206) is provided on the side of the brush (21).

6. The room-type multi-parameter air quality sensor according to claim 5, characterized in that: The toothed plate (202) is elastically connected to the inner wall of the second slide groove (201) through the second elastic element (204). The bottom of the toothed plate (202) meshes with the drive gear (152). The partition plate (203) extends through the inner wall of the second slide groove (201) to the side of the guide groove (191). The brush (21) is slidably connected to the inner wall of the detection cavity (17).

7. The room-type multi-parameter air quality sensor according to claim 5, characterized in that: The drive assembly (22) includes a third slide groove (226) provided in the sensor body (10), a bidirectional reciprocating screw (221) provided in the third slide groove (226), a sleeve (222) slidably sleeved on the bidirectional reciprocating screw (221), a screw nut (223) rotatably connected inside the sleeve (222), a pressure plate (224) fixedly connected on the sleeve (222), a piston rod (225) fixedly connected to the side of the pressure plate (224), and the side of the bidirectional reciprocating screw (221) connected to a drive gear (152) for driving its rotation.

8. The room-type multi-parameter air quality sensor according to claim 7, characterized in that: The pressure plate (224) is slidably connected to the third slide groove (226), the brush (21) extends through the inner wall of the detection cavity (17) to the interior of the third slide groove (226), the brush (21) is fixedly connected to the sleeve (222), and the side of the brush (21) is provided with a first diaphragm (205) for separating the air inlet groove (12) and the third slide groove (226).

9. The room-type multi-parameter air quality sensor according to claim 7, characterized in that: The gas storage assembly (23) includes a gas storage tank (231) provided inside the sensor body (10), an air inlet (232) provided on the side of the sensor body (10), a one-way valve (233) provided inside the air inlet (232), a guide groove (234) provided inside the sensor body (10), and a gas delivery pipe (235) provided inside the sensor body (10).

10. The room-type multi-parameter air quality sensor according to claim 9, characterized in that: The guide groove (234) is equipped with a one-way valve (233). The air supply pipe (235) is made of an elastic telescopic tube. The two ends of the air supply pipe (235) are connected to the guide groove (234) and the nozzle (25) respectively. The air bag (24) is located on the side of the pressure plate (224) away from the piston rod (225). The piston rod (225) is slidably connected to the air storage tank (231). The two sides of the air bag (24) are connected to the one-way valve (233) and the guide groove (234) respectively.

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