Detection device for gaseous pollutants in air

Abstract

The invention discloses a detection device for gaseous pollutants in air. The detection device comprises a variable section structure, a transmission structure and a variable choke structure, the two ends of the variable-section structure are connected with the two transmission sections of the transmission structure, the wind wheel connected with the driving section of the transmission structure is driven by airflow to rotate, the shape of the variable-section structure is switched between a similar tubular shape and a similar spherical shape, and the two telescopic pipes arranged at the two ends of the variable-section structure are matched with deformation of the variable-section structure to extend or retract. The variable choke structure comprises choke plates A and choke plates B, the multiple choke plates A are obliquely arranged in a connecting ring connected with the opposite ends of the two telescopic pipes in an annular array mode to be matched with deformation of the variable section structure, and the multiple choke plates B are matched with the multiple choke plates A in a one-to-one telescopic mode through a multi-connecting-rod mechanism on the variable choke structure. The variable-cross-section structure has the advantages that the variable-cross-section structure is switched from a tubular-like shape to a spherical-like shape under external high-speed air flow, the air blocking surface of the variable air blocking structure is increased, and blown-in air flow is detected after speed reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air gaseous pollutant detection, in particular to an air gaseous pollutant detection device. BACKGROUND

[0002] Air pollutants include particulate matter and gaseous pollutants, etc., and the gaseous pollutants include ozone, nitrogen oxides, sulfur dioxide, carbon monoxide, volatile organic compounds, heavy metals, ammonia, etc.

[0003] For regional air quality detection, an air station uses an electrochemical sensor as a detection carrier to detect gaseous pollutants. The air station is set outdoors, and outdoor air enters the air station with the wind, and the airflow contacts the detection end of the electrochemical sensor, and the gaseous pollutants in the air are detected by the electrochemical sensor in the air station. Different gaseous pollutants are detected by setting multiple corresponding electrochemical sensors, and then the air is discharged from the air station.

[0004] The flow rate of outdoor gas is variable, and the flow rate of gas will affect the detection of the electrochemical sensor. The flow rate of gas (> 2 m / s) will cause the diffusion layer of the electrochemical sensor to be compressed, the response speed to be accelerated, and the electrolyte of the electrochemical sensor to evaporate at an accelerated speed (30% shorter life), and the high flow rate will disturb the gas-solid interface balance, and the output fluctuation of the electrochemical sensor will increase.

[0005] In view of this, an air gaseous pollutant detection device is provided. SUMMARY

[0006] The purpose of the present application is to provide an air gaseous pollutant detection device to solve the problem of shortened life caused by the electrolyte of the electrochemical sensor evaporating at an accelerated speed due to too fast gas flow rate, and the output fluctuation of the electrochemical sensor increasing.

[0007] To achieve the above purpose, the present application provides the following technical scheme: an air gaseous pollutant detection device, comprising a variable cross-section structure, a transmission structure, a sensor group and a variable wind resistance structure arranged in a detection device case;

[0008] The two ends of the variable cross-section structure are connected with the two transmission sections of the transmission structure having opposite and opposite directions, and the wind wheel connected with the driving section of the transmission structure is rotated by the airflow, the shape of the variable cross-section structure is switched between the tubular shape and the spherical shape, and the two telescopic pipes arranged at the two ends of the variable cross-section structure are elongated or shortened in cooperation with the deformation of the variable cross-section structure. The high-speed airflow drives the wind wheel to rotate, the two transmission sections of the transmission structure move relatively, the two ends of the variable cross-section structure move relatively, the variable cross-section structure is switched from the tubular shape to the spherical shape, the cross section of the variable cross-section structure becomes larger, and the airflow blown from the telescopic pipe enters a larger space and is slowed down.

[0009] Pipes are fixed to the connecting rings at opposite ends of the two telescopic tubes, and the pipes connect to the outside of the chassis; airflow enters or exits along the pipes.

[0010] A variable air resistance structure is installed inside the telescopic tube. The variable air resistance structure includes air resistance plates A and B. Multiple air resistance plates A are arranged in a ring array and tilted within a connecting ring at opposite ends of the two telescopic tubes. In conjunction with the deformation of the variable cross-section structure, multiple air resistance plates B are connected to the multiple air resistance plates A one-to-one by a multi-link mechanism on the variable air resistance structure. When high-speed airflow enters the variable cross-section structure and passes through it, the air resistance surface of the variable air resistance structure increases as the variable cross-section structure switches from a tubular shape to a spherical shape, further reducing the velocity of the high-speed airflow.

[0011] The sensor array is located at the bottom of the variable cross-section structure, and the size of the sensors in the sensor array within the projection range of the variable wind resistance structure in the vertical direction is driven by the wind turbine.

[0012] Preferably, the variable cross-section structure includes elastic sheets and elastic membranes, with multiple elastic sheets and multiple elastic membranes alternately joined to form a cylindrical component. Both ends of the cylindrical component are fixed to connecting rings at opposite ends of two telescopic tubes. The elastic membranes are located between adjacent elastic sheets, and when the elastic sheets bend, the elastic membranes adaptably expand, exhibiting better extensibility.

[0013] The connection point with the sensor assembly is an elastic membrane. The expansion and contraction of the elastic membrane is flexible and will not affect the sensor assembly.

[0014] Preferably, the inner wall of the elastic sheet is fixed with multiple air baffles. When the airflow entering the variable cross-section structure passes through the air baffles, it is further decelerated, and when the elastic sheet bends, two adjacent air baffles come into contact with each other to form an obstruction, so the elastic sheet will not bend excessively.

[0015] Preferably, the transmission structure includes slide rails, racks, connecting shafts, gears, and connecting bars. Two slide rails are symmetrically fixed inside the housing. Two racks are slidably disposed within the grooves of the two slide rails. One end of the connecting shaft is connected to the impeller, and the other end is connected to the gear. The gear meshes with the two racks. One end of each connecting bar is connected to one of the two racks, and the other end is connected to the connecting rings at both ends of the variable wind resistance structure. When the impeller is blown by airflow, it drives the gear to rotate, causing the two racks meshing with the gear to move relative to each other, thereby causing the two connecting bars to move relative to each other.

[0016] Preferably, the rack is provided with guide bars at both the upper and lower ends, and the two guide bars slide within guide grooves corresponding to the upper and lower ends of the slide groove. As the rack slides along the slide groove, the guide bars slide along the guide grooves to limit the sliding of the rack and maintain the stability of the rack's sliding.

[0017] Preferably, the variable resistance structure further comprises a connecting rod A and a connecting rod B, one end of the connecting rod A is fixed with a fixed rod, the fixed rod is fixed with a connecting ring between the telescopic pipe and the variable cross-section structure, the other end of the connecting rod A is sleeved with a sleeve ring, a plurality of rotating shafts A are arranged in an annular array on the sleeve ring, a plurality of rotating shafts B are arranged at the inner ends of the plurality of wind resistance plates B, and the two ends of the plurality of connecting rods B are connected with the plurality of rotating shafts A and the plurality of rotating shafts B respectively. When the connecting rings at the two ends of the variable cross-section structure move relatively, the telescopic pipe is stretched, at this time, the fixed rod drives the connecting rod A to move transversely, thereby driving the sleeve ring to move transversely, the connecting rod B moves transversely and tilts under the cooperation of the rotating shaft A and the rotating shaft B, thereby pulling the wind resistance plate B out of the wind resistance plate A, the wind resistance plate A and the wind resistance plate B form a larger wind resistance surface, and the gas flow rate is further reduced.

[0018] Preferably, the wind resistance plate A is provided with a movable slot, and the wind resistance plate B is inserted into the movable slot.

[0019] Preferably, limit grooves are arranged at the two side walls of the movable slot respectively, and limit blocks are fixed at the two sides of the wind resistance plate B respectively, and the limit blocks slide along the limit grooves. When the wind resistance plate B is pulled out of the movable slot, the limit blocks slide along the limit grooves, the pulling-out distance of the wind resistance plate B is limited, the wind resistance plate B will not be separated from the wind resistance plate A, and the wind resistance plate B will not affect the pushing of the wind resistance plate B into the wind resistance plate A.

[0020] Preferably, the sensor group comprises a circuit board box, a base, a connecting chamber and an electrochemical sensor body, the circuit board box is arranged in the cabinet, the base is arranged above the circuit board box and is fixed with the circuit board box through a stand column, the connecting chamber is fixed on the base, a plurality of electrochemical sensor bodies are sequentially inserted into the sockets on the circuit board box through the holes on the base, the connecting chamber is connected with the elastic film, and the detection end of the electrochemical sensor body is located in the cavity of the variable cross-section structure. The electrochemical sensor body is electrically connected in the form of insertion, and the operation is convenient.

[0021] Compared with the prior art, the application has the following advantages:

[0022] The application has the advantages that under the external high-speed airflow, the variable cross-section structure is switched from a pipe-like shape to a spherical shape, the wind resistance surface of the variable resistance structure is increased, and the blown-in airflow is detected after being slowed down.

[0023] In the application, the variable cross-section structure and the variable resistance structure change synchronously, the speed reduction capacity for the incoming airflow is enhanced according to the acceleration of the gas flow rate, and the incoming airflow is slowed down faster under the high-speed airflow. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Structure diagram of the whole structure of the present application;

[0025] Figure 2 Structure diagram of the structure of the present application before adjusting the gas flow rate;

[0026] Figure 3 Structure diagram of the structure of the present application after adjusting the gas flow rate;

[0027] Figure 4 Structure diagram of the transmission structure of the present application;

[0028] Figure 5 Structure diagram of the variable cross-section structure of the present application;

[0029] Figure 6 Structure diagram of the variable wind resistance structure of the present application before changing;

[0030] Figure 7 Structure diagram of the variable wind resistance structure of the present application after changing;

[0031] Figure 8 Structure diagram of the variable wind resistance structure of the present application;

[0032] Figure 9 Structure diagram of the connection structure of the wind resistance plate A and the wind resistance plate B of the present application;

[0033] Figure 10 Explosive diagram of the wind resistance plate A and the wind resistance plate B of the present application;

[0034] Figure 11 Structure diagram of the sensor group of the present application.

[0035] In the figure: 100, case; 200, variable cross-section structure; 300, transmission structure; 400, wind wheel; 500, sensor group; 600, telescopic pipe; 700, pipe; 800, connecting ring; 900, variable wind resistance structure;

[0036] 201, elastic sheet; 202, elastic film; 203, wind resistance strip;

[0037] 301, slide; 302, rack; 303, connecting shaft; 304, gear; 305, connecting strip;

[0038] 3011, sliding groove; 3012, guide groove;

[0039] 3021, guide strip;

[0040] 501, circuit board box; 502, base; 503, stand; 504, connecting chamber; 505, electrochemical sensor body;

[0041] 901, connecting rod A; 902, fixed rod; 903, collar; 904, rotating shaft A; 905, wind deflector A; 906, wind deflector B; 907, rotating shaft B; 908, connecting rod B;

[0042] 9051, movable slot; 9052, limiting slot;

[0043] 9061, limiting block. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0045] A detection device for air gaseous pollutants, please refer to Figures 1 to 3 、 Figure 6 and Figure 7 , comprising a variable cross-section structure 200, a transmission structure 300, a sensor group 500 and a variable wind resistance structure 900 arranged in a detection device case 100; the case 100 is provided with a gas collection system, an analysis instrument system, a calibration system, a data acquisition and transmission system;

[0046] The gas collection system comprises a plurality of gas detection sensors;

[0047] The analysis instrument system comprises a gas analyzer;

[0048] The calibration system comprises a dynamic gas calibrator;

[0049] The data acquisition and transmission system comprises a data acquisition device, an industrial computer / server and a data transmission unit.

[0050] Two ends of the variable cross-section structure 200 are connected with two transmission sections of the transmission structure 300 having opposite and opposite directions, and the wind wheel 400 connected with the driving section of the transmission structure 300 is driven to rotate by airflow, the shape of the variable cross-section structure 200 is switched between a pipe-like shape and a spherical shape, and the two telescopic pipes 600 arranged at two ends of the variable cross-section structure 200 are elongated or shortened in cooperation with the deformation of the variable cross-section structure 200.

[0051] The high-speed airflow drives the wind wheel 400 to rotate, under the action of the rotating wind wheel 400, the two transmission sections of the transmission structure 300 move relatively, so that the two ends of the variable cross-section structure 200 move relatively, the variable cross-section structure 200 is switched from a pipe-like shape to a spherical shape, the cross-section of the variable cross-section structure 200 becomes larger, and the airflow blown from the telescopic pipe 600 enters a larger space and is slowed down.

[0052] Two telescopic tubes 600 are connected to a connecting ring 800 at opposite ends, and a pipe 700 is fixed thereon. The pipe 700 connects to the outside of the chassis 100. Airflow enters or exits along the pipe 700.

[0053] In this embodiment, the telescopic tube 600 is a corrugated pipe.

[0054] A variable air resistance structure 900 is installed inside the telescopic pipe 600. The variable air resistance structure 900 includes air resistance plates A905 and B906. Multiple air resistance plates A905 are arranged in a ring array and tilted within the connecting ring 800 connecting the opposite ends of the two telescopic pipes 600. In conjunction with the deformation of the variable cross-section structure 200, the multiple air resistance plates B906 are telescopically connected to the multiple air resistance plates A905 via a multi-link mechanism on the variable air resistance structure 900. When a high-speed airflow enters the variable cross-section structure 200 and passes through the variable air resistance structure 900, as the variable cross-section structure 200 switches from a tubular shape to a spherical shape, the air resistance surface of the variable air resistance structure 900 increases, further reducing the velocity of the high-speed airflow.

[0055] The sensor group 500 is located at the bottom of the variable cross-section structure 200, and the size of the sensor of the sensor group 500 in the vertical direction within the projection range of the wind outlet of the variable wind resistance structure 900 is driven by the wind turbine 400.

[0056] This invention, by incorporating a wind turbine 400, a variable cross-section structure 200, a telescopic tube 600, a transmission structure 300, and a variable wind resistance structure 900, has the advantages of allowing the variable cross-section structure 200 to switch from a tubular to a spherical shape under high-speed external airflow, increasing the wind resistance surface of the variable wind resistance structure 900, and slowing down the incoming airflow for detection. This solves the problem that excessively high gas flow rates can lead to shorter detection lifespan and increased output fluctuations in electrochemical sensors.

[0057] For details, please refer to Figure 5 The variable cross-section structure 200 includes elastic sheets 201 and elastic membranes 202. Multiple elastic sheets 201 and multiple elastic membranes 202 are alternately joined to form a cylindrical component. Both ends of the cylindrical component are fixed to connecting rings 800 at opposite ends of two telescopic tubes 600. The elastic membranes 202 are located between adjacent elastic sheets 201. When the elastic sheets 201 bend, the elastic membranes 202 expand adaptively, providing better extensibility.

[0058] In this embodiment, when the telescopic tube 600 is at its shortest length, the elastic plate 201 is in a slightly bent state. The elastic plate 201 abuts against the connecting rings 800 at both ends. Under normal gas flow rate, the elastic force generated by the slightly bent elastic plate 201 prevents the impeller 400 from being blown away. When the gas flow rate is too fast, the force that blows the impeller 400 is greater than the elastic force generated by the elastic plate 201, and the variable cross-section structure 200 deforms.

[0059] The sensor group 500 is electrically connected with the analytical instrument system in the cabinet 100.

[0060] In this embodiment, the elastic film 202 is connected with the sensor group 500, and the expansion and contraction of the elastic film 202 is flexible and does not affect the sensor group 500.

[0061] In this embodiment, the inner wall of the elastic sheet 201 is fixed with a plurality of wind-blocking strips 203. The airflow entering the variable cross-section structure 200 is further slowed down when passing through the wind-blocking strips 203, and after the elastic sheet 201 is bent, the adjacent two wind-blocking strips 203 contact each other to form an obstacle, and the elastic sheet 201 will not be excessively bent.

[0062] Please refer to Figure 4 , the transmission structure 300 includes two slides 301, two racks 302, a connecting shaft 303, a gear 304, and two connecting strips 305. The two slides 301 are symmetrically fixed in the cabinet 100, the two racks 302 are respectively slidably arranged in the sliding grooves 3011 of the two slides 301, one end of the connecting shaft 303 is connected with the wind wheel 400, the other end is connected with the gear 304, the gear 304 is engaged with the two racks 302, one end of each of the two connecting strips 305 is connected with the two racks 302, and the other end is connected with the connecting rings 800 at two ends of the variable wind-blocking structure 900. The wind wheel 400 is driven by the airflow to drive the gear 304 to rotate, the two racks 302 engaged with the gear 304 move relatively, thereby driving the two connecting strips 305 to move relatively, thereby driving the two connecting rings 800 at one end of the two telescopic pipes 600 to move relatively, and realizing the deformation of the variable cross-section structure 200.

[0063] In this embodiment, the connecting shaft 303 passes through the top of the cabinet 100, and the connecting shaft 303 is rotatably connected with the cabinet 100 through a bearing.

[0064] In this embodiment, the rack 302 and the gear 304 can be made of self-lubricating material.

[0065] In this embodiment, the connecting strip 305 is L-shaped, the horizontal ends of the two L-shaped connecting strips 305 are respectively fixed with the two racks 302, and the vertical ends of the two L-shaped connecting strips 305 are respectively fixed with the top middle sections of the two connecting rings 800. When the two connecting rings 800 move relatively or oppositely, the stress point is in the middle section, and it is stable.

[0066] In this embodiment, the rack 302 is provided with a guide strip 3021 at the upper and lower ends, and the two guide strips 3021 are respectively slidably arranged in the guide grooves 3012 corresponding to the upper and lower ends of the sliding groove 3011. During the sliding of the rack 302 along the sliding groove 3011, the guide strip 3021 slides along the guide groove 3012 to limit the sliding of the rack 302, and the sliding of the rack 302 is stable.

[0067] Please refer to Figures 6 to 8 The variable resistance structure 900 further comprises a connecting rod A 901 and a connecting rod B 908. One end of the connecting rod A 901 is fixed with a fixed rod 902, and the fixed rod 902 is fixed with the connecting ring 800 between the telescopic pipe 600 and the variable cross-section structure 200. The other end of the connecting rod A 901 is sleeved with a sleeve ring 903, and a plurality of rotating shafts A 904 are arranged in an annular array on the sleeve ring 903. The inner ends of a plurality of resistance plates B 906 are provided with rotating shafts B 907, and the two ends of a plurality of connecting rods B 908 are connected with the rotating shafts A 904 and the rotating shafts B 907 respectively. When the connecting rings 800 at both ends of the variable cross-section structure 200 move relatively, the telescopic pipe 600 is stretched. At this time, the fixed rod 902 drives the connecting rod A 901 to move transversely, thereby driving the sleeve ring 903 to move transversely. The connecting rod B 908 moves transversely and tilts under the cooperation of the rotating shafts A 904 and the rotating shafts B 907, so as to tilt and pull out the resistance plate B 906 from the inside of the resistance plate A 905. The resistance plate A 905 and the resistance plate B 906 form a larger resistance surface, and further reduce the gas flow rate.

[0068] In this embodiment, please refer to Figures 9 to 10 An active slot 9051 is formed on the resistance plate A 905, and the resistance plate B 906 is inserted into the active slot 9051. The resistance plate B 906 moves in and out of the resistance plate A 905 along the active slot 9051, and the resistance plate B 906 can be hidden in the resistance plate A 905.

[0069] In this embodiment, please refer to Figures 9 to 10 Limiting grooves 9052 are respectively formed at both sides of the active slot 9051. One end of the limiting groove 9052 is open, and the other end in the limiting groove 9052 is closed. Limiting blocks 9061 are respectively fixed at both sides of the resistance plate B 906, and the limiting blocks 9061 slide along the limiting grooves 9052. When the resistance plate B 906 is pulled out of the active slot 9051, the limiting blocks 9061 slide along the limiting grooves 9052, and the pulling-out distance of the resistance plate B 906 is limited. The resistance plate B 906 will not be separated from the resistance plate A 905, and will not affect the resistance plate B 906 to be pushed back into the resistance plate A 905.

[0070] Please refer to Figure 11The sensor group 500 comprises a circuit board box 501, a base 502, a connecting chamber 504 and an electrochemical sensor body 505. The circuit board box 501 is arranged in the cabinet 100 and electrically connected with the analytical instrument system. The base 502 is arranged above the circuit board box 501 and fixed with the circuit board box 501 through the stand column 503. The connecting chamber 504 is fixed on the base 502. The electrically connected ends of the plurality of electrochemical sensor bodies 505 pass through the holes on the base 502 in sequence and are plugged with the sockets on the circuit board box 501. The connecting chamber 504 is connected with the elastic film 202. The detection end of the electrochemical sensor body 505 is located in the cavity of the variable cross-section structure 200. The electrochemical sensor body 505 is electrically connected in the plug-in mode, which is convenient to operate.

[0071] In the embodiment, the electrochemical sensor body 505 comprises a gas-permeable film, a filter, an electrode system, an electrolyte, a pin and a shell.

[0072] The gas-permeable film is located at the top detection end of the electrochemical sensor body 505. The filter is located below the gas-permeable film. The electrode system is deposited on a hydrophobic gas-permeable substrate. The electrolyte fills the entire sensor cavity and infiltrates all electrodes.

[0073] Working principle: After the cabinet 100 is arranged outdoors and the corresponding devices are installed, under the condition of non-high-speed airflow, the elastic force of the slightly curved elastic sheet 201 resists against the adjacent two connecting rings 800. The telescopic pipe 600 is in the shortest state. The wind wheel 400 cannot be blown by the airflow. The external airflow enters from one pipe 700, passes through one telescopic pipe 600, enters the tubular variable cross-section structure 200 after passing through the annularly distributed plurality of inclined air resistance plates A905, is detected by the detection end of the electrochemical sensor body 505 after passing through the electrochemical sensor body 505, and then is discharged from another telescopic pipe 600 and another pipe 700.

[0074] In the case of high-speed airflow, the wind wheel 400 is blown by high-speed airflow, under the action of the rotating wind wheel 400, the connecting shaft 303 rotates with the wind wheel 400, the gear 304 also rotates, and the two racks 302 meshing with the gear 304 move relatively along the slide 301 respectively, the guide bar 3021 moves along the guide groove 3012, so that the two connecting bars 305 move relatively, the two connecting rings 800 fixed with the two connecting bars 305 move relatively, the elastic sheet 201 bends, the elastic film 202 adaptively expands, the variable cross-section structure 200 switches from a tubular shape to a spherical shape, and the telescopic pipe 600 stretches, the connecting ring 800 at the connection of the variable cross-section structure 200 moves, the fixed rod 902 drives the connecting rod A 901 to move laterally, thereby driving the sleeve ring 903 to move laterally, since the connecting ring 800 where the wind deflector A 905 is located is stationary, the connecting rod B 908 moves laterally and tilts under the cooperation of the rotating shaft A 904 and the rotating shaft B 907, thereby tilting the wind deflector B 906 out of the wind deflector A 905, and the wind deflector A 905 and the wind deflector B 906 form a larger wind deflector. The external high-speed airflow enters from a pipe 700, passes through a telescopic pipe 600, and the airflow entering the telescopic pipe 600 is slowed down after passing through the wind deflector B 906 and the wind deflector A 905, and the cross-section of the variable cross-section structure 200 becomes larger after switching to a spherical shape, the airflow blown from the telescopic pipe 600 enters a larger space and is slowed down, and the airflow after being slowed down is detected by the electrochemical sensor body 505, and then the airflow is discharged from another telescopic pipe 600 and another pipe 700.

[0075] When the external airflow is not high-speed, the variable cross-section structure 200 switches from a spherical shape to a tubular shape, the telescopic pipe 600 contracts, and the wind deflector B 906 is pushed back into the wind deflector A 905, which is used in the non-high-speed airflow state.

[0076] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A device for detecting gaseous air pollutants, characterized in that: It includes a variable cross-section structure (200), a transmission structure (300), a sensor group (500), and a variable wind resistance structure (900) installed in the housing (100) of the detection device; The two ends of the variable cross-section structure (200) are connected to the two transmission sections of the transmission structure (300) which have relative and opposite transmission directions. The wind turbine (400) connected to the drive section of the transmission structure (300) is driven to rotate by the airflow. The shape of the variable cross-section structure (200) switches between tubular and spherical. The two telescopic tubes (600) set at both ends of the variable cross-section structure (200) lengthen or shorten in coordination with the deformation of the variable cross-section structure (200). Pipes (700) are fixed on the connecting rings (800) at opposite ends of the two telescopic pipes (600), and the pipes (700) connect to the outside of the chassis (100); A variable wind-blocking structure (900) is installed inside the telescopic pipe (600). The variable wind-blocking structure (900) includes wind-blocking plate A (905) and wind-blocking plate B (906). Multiple wind-blocking plates A (905) are arranged in a ring array and tilted inside the connecting ring (800) connecting the opposite ends of the two telescopic pipes (600). With the deformation of the variable cross-section structure (200), multiple wind-blocking plates B (906) are telescopically connected to multiple wind-blocking plates A (905) one by one by the multi-link mechanism on the variable wind-blocking structure (900). The sensor group (500) is located at the bottom of the variable cross-section structure (200), and the size of the sensor of the sensor group (500) in the vertical direction within the projection range of the wind outlet of the variable wind resistance structure (900) is driven by the wind wheel (400).

2. The detection device for gaseous air pollutants according to claim 1, characterized in that: The variable cross-section structure (200) includes elastic sheets (201) and elastic membranes (202). Multiple elastic sheets (201) and multiple elastic membranes (202) are alternately connected to form a cylindrical component. The two ends of the cylindrical component are respectively fixed to the connecting rings (800) at opposite ends of two telescopic tubes (600). Among them, the connection point with the sensor group (500) is an elastic membrane (202).

3. The detection device for gaseous air pollutants according to claim 2, characterized in that: Multiple air-blocking strips (203) are fixed to the inner wall of the elastic sheet (201).

4. The detection device for gaseous air pollutants according to claim 2, characterized in that: The transmission structure (300) includes a slide rail (301), a rack (302), a connecting shaft (303), a gear (304), and a connecting bar (305). The two slide rails (301) are symmetrically fixed inside the housing (100). The two racks (302) are slidably disposed in the grooves (3011) of the two slide rails (301). One end of the connecting shaft (303) is connected to the wind turbine (400), and the other end is connected to the gear (304). The gear (304) meshes with the two racks (302). One end of the two connecting bars (305) is connected to the two racks (302), and the other end is connected to the connecting rings (800) at both ends of the variable wind resistance structure (900).

5. The detection device for gaseous air pollutants according to claim 4, characterized in that: The rack (302) is provided with guide bars (3021) at both the upper and lower ends, and the two guide bars (3021) slide in the guide grooves (3012) opened at the upper and lower ends of the slide groove (3011), respectively.

6. The detection device for gaseous air pollutants according to claim 4, characterized in that: The variable wind resistance structure (900) further includes a connecting rod A (901) and a connecting rod B (908). One end of the connecting rod A (901) is fixed with a fixing rod (902). The fixing rod (902) is fixed with a connecting ring (800) between the telescopic tube (600) and the variable cross-section structure (200). The other end of the connecting rod A (901) is sleeved with a collar (903). Multiple rotating shafts A (904) are arranged in a ring array on the collar (903). The inner ends of multiple wind resistance plates B (906) are all provided with rotating shafts B (907). The two ends of the multiple connecting rods B (908) are respectively connected to multiple rotating shafts A (904) and multiple rotating shafts B (907).

7. The detection device for gaseous air pollutants according to claim 6, characterized in that: The wind baffle plate A (905) has a movable groove (9051), and the wind baffle plate B (906) is inserted into the movable groove (9051); Among them, limit grooves (9052) are respectively opened on both sides of the active groove (9051), and limit blocks (9061) are respectively fixed on both sides of the wind baffle plate B (906). The limit blocks (9061) slide along the limit grooves (9052).

8. The detection device for gaseous air pollutants according to claim 2, characterized in that: The sensor assembly (500) includes a circuit board box (501), a base (502), a connecting chamber (504), and an electrochemical sensor body (505). The circuit board box (501) is disposed inside the chassis (100). The base (502) is disposed above the circuit board box (501) and fixed to the circuit board box (501) by a column (503). The connecting chamber (504) is fixed on the base (502). The electrical connection ends of multiple electrochemical sensor bodies (505) pass through holes on the base (502) in sequence and are plugged into sockets on the circuit board box (501). The connecting chamber (504) is connected to the elastic membrane (202), and the detection end of the electrochemical sensor body (505) is located inside the cavity of the variable cross-section structure (200).

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