Atmospheric sampling device

Abstract

The utility model belongs to atmospheric sampling technical field especially relates to an atmospheric sampling device, include: the round tub one, the detachable installation round tub two on the round tub one upper end, the bucket groove two is established on the round tub two upper end, the filter screen is fixed in the bucket groove two inside bottom, the ring is fixedly installed in the filter screen, the fixed disc is fixed in the bucket groove two inside upper end, the screw thread disc is detachably installed in the fixed disc, the hydrophobic microporous membrane is fixed in the screw thread disc, the rubber sealing ring is fixed in the hydrophobic microporous membrane, the pipeline is fixed in the rubber sealing ring, the mounting plate is fixedly installed in the pipeline, the fan blade is rotatably connected to the mounting plate lower end, the threaded rod is fixed to the fan blade bottom, the threaded rod bottom penetrates the installation ring and extends into the round tub one, the threaded rod bottom penetrates the moving disc, and is threadedly connected. The utility model has the advantages that air and foreign particles in the atmosphere can be separated and sampled at the same time, the diversity and efficiency of the function are improved, and installation and dismounting are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of atmospheric sampling technology, and in particular relates to an atmospheric sampling device. Background Technology

[0002] Atmospheric sampling refers to the process of collecting gas or particulate matter samples from the atmospheric environment using scientific methods. Its purpose is to obtain physical, chemical, or biological data on the composition of air for use in environmental monitoring, pollution assessment, meteorological research, or health impact analysis.

[0003] In atmospheric sampling, traditional methods typically require the separate operation of air sampling devices and particulate matter sampling devices, depending on the target substance. Air sampling devices are mainly used to collect gaseous pollutants such as sulfur dioxide, nitrogen oxides, and volatile organic compounds, usually employing methods such as adsorption tubes, gas bags, or condensation enrichment. Particulate matter sampling devices, on the other hand, target suspended particles and typically rely on impact samplers or cyclone separators. Because the physical properties of the two target substances differ significantly, the use of different devices for separate sampling leads to frequent equipment changes, parameter adjustments, and even multiple samplings during actual monitoring or research. This not only increases operational complexity but also reduces overall work efficiency.

[0004] Furthermore, during particulate matter sampling, airflow disturbances can cause collected particles to be carried out of the sampling chamber by reverse airflow, resulting in a lower-than-expected sample volume. This is particularly noticeable during long-term sampling or in high-wind-speed environments, affecting the accuracy of subsequent analyses. Simultaneously, particles of different sizes may be further lost during sampling due to inertial impaction, rebound, or secondary suspension. Ultrafine particles, in particular, are more prone to escape due to Brownian motion or turbulence within the sampler, making it difficult for the sampling results to accurately reflect the actual concentration and composition of particulate matter in the atmosphere. These issues increase the risk of experimental error. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned technical problems by providing an atmospheric sampling device that can simultaneously separate and sample air and foreign particles in the atmosphere, thereby improving the versatility and efficiency of its functions, while also facilitating installation and disassembly.

[0006] In view of this, the present invention provides an atmospheric sampling device, comprising:

[0007] A cylindrical barrel 1, with a cylindrical barrel 2 detachably mounted on its upper end. A barrel groove 2 is formed at the upper end of the cylindrical barrel 2. A filter screen is fixed at the bottom inside the barrel groove 2. An installation ring is fixed inside the filter screen. A fixing plate is fixed at the upper end inside the barrel groove 2. A threaded disc is detachably mounted inside the fixing plate. A hydrophobic microporous membrane is fixed inside the threaded disc. A rubber sealing ring is fixed inside the hydrophobic microporous membrane. A pipe is fixed inside the rubber sealing ring. An installation plate is fixed inside the pipe. A fan blade is rotatably connected to the lower end of the installation plate. A threaded rod is fixed to the bottom end of the fan blade.

[0008] The bottom end of the threaded rod passes through the mounting ring and extends into the cylinder. The bottom end of the threaded rod also passes through the movable disc and is threadedly connected.

[0009] In this technical solution,

[0010] Furthermore, liquid is placed in the second tank, and the liquid is located above the hydrophobic microporous membrane. The surface of the hydrophobic microporous membrane material is superhydrophobic, so water cannot pass through the micropores due to surface tension, while gas molecules can pass through freely.

[0011] Furthermore, a threaded hole is opened at the upper end of the fixed disk, and a sealing rubber I is installed on the internal thread of the threaded hole. An external thread is opened on the outer wall of the threaded disk, and a sealing rubber II is installed on the external thread. The threaded disk extends into the threaded hole opened at the upper end of the fixed disk, and the internal thread is connected to the external thread. The sealing rubber I and the sealing rubber II are fitted together.

[0012] Furthermore, a pipe hole is opened at the upper end of the pipe, the mounting plate is fixed in the pipe hole, the upper end of the mounting plate is fixed with a motor, and the drive end of the motor is fixed with fan blades.

[0013] Furthermore, an installation hole is provided at the lower end of the second cylindrical barrel, and the filter screen is fixed in the installation hole.

[0014] Furthermore, a groove is formed at the upper end of the cylindrical barrel, and the bottom end of the threaded rod extends into the groove through the pipe hole.

[0015] Furthermore, a limiting groove is provided at one end of the inner wall of the barrel trough, a threaded hole is provided at the upper end of the movable disk, the bottom end of the threaded rod passes through the threaded hole provided in the movable disk and is threadedly connected, a movable plate is fixed at one end of the outer wall of the movable disk, one end of the movable plate is inserted into the limiting groove, a connecting plate is fixed at the other end of the outer wall of the movable disk, and a baffle is fixed at the lower end of the connecting plate.

[0016] Furthermore, a connecting pipe 2 is installed at one end of the outer wall of the first cylindrical barrel, the first connecting pipe is inserted into the second connecting pipe, a collection bucket is installed at one end of the first connecting pipe, and valves are installed at the upper ends of the outer walls of the first and second connecting pipes.

[0017] Furthermore, one end of the baffle is arc-shaped and fits against the inner wall of the barrel groove.

[0018] Furthermore, an annular screw groove is formed at the lower end of the second cylinder, and a threaded ring is fixed at the upper end of the first cylinder. The threaded ring extends into the annular screw groove and is threadedly connected.

[0019] The beneficial effects of this utility model are:

[0020] This utility model features a second cylindrical barrel detachably mounted on the upper end of a first cylindrical barrel. A groove is formed at the upper end of the second cylindrical barrel. A filter screen is fixed to the bottom of the groove, and an installation ring is fixed inside the filter screen. A fixing plate is fixed to the upper end of the groove, and a threaded disc is detachably mounted inside the fixing plate. A hydrophobic microporous membrane is fixed inside the threaded disc, a rubber sealing ring is fixed inside the hydrophobic microporous membrane, a pipe is fixed inside the rubber sealing ring, and an installation plate is fixed inside the pipe. A fan blade is rotatably connected to the lower end of the installation plate, and a threaded rod is fixed to the bottom end of the fan blade. The bottom end of the threaded rod passes through the installation ring and extends into the first cylindrical barrel, and the bottom end of the threaded rod passes through the movable disc and is threadedly connected. When atmospheric air sampling is required, the device... When installed in a suitable location, the motor is started, causing the fan blades to rotate and blow outside air into the second tank. After being filtered by the filter screen, foreign particles in the air are intercepted and collected by the filter screen. The filtered air enters the first tank and then enters the collection tank through the first and second connecting pipes. While collecting, the baffle moves downward. After collecting for a period of time, the baffle blocks the second connecting pipe. The sampling of air and foreign particles is completed and then tested. This achieves the effect of simultaneously separating and sampling air and foreign particles in the atmosphere, improving the versatility and efficiency of functions, and also facilitating installation and disassembly. Attached Figure Description

[0021] Figure 1 This is the front view of this utility model;

[0022] Figure 2 This is a cross-sectional view of the present invention;

[0023] Figure 3 This is a sectional view of the cylindrical part of this utility model;

[0024] Figure 4 This is the utility model Figure 3 Enlarged view of point A;

[0025] Figure 5 This is a top view of the hydrophobic microporous membrane of this utility model;

[0026] Figure 6 This is the main view of the pipe of this utility model;

[0027] Figure 7 This is a cross-sectional view of the pipe of this utility model;

[0028] Figure 8 This is the utility model Figure 7 Enlarged view of point B;

[0029] The markings in the diagram are as follows:

[0030] 1. Circular barrel one; 2. Circular barrel two; 3. Collection barrel; 4. Limiting groove; 5. Barrel trough one; 6. Barrel trough two; 7. Liquid; 8. Pipe; 9. Pipe hole; 10. Motor; 11. Threaded rod; 12. Filter screen; 13. Mounting ring; 14. Connecting pipe one; 15. Connecting pipe two; 16. Annular threaded groove; 17. Mounting hole; 18. Threaded ring; 19. Fixed plate; 20. Threaded plate; 21. Hydrophobic microporous membrane; 22. Rubber sealing ring; 23. Moving plate; 24. Moving plate; 25. Connecting plate; 26. Baffle plate; 27. Fan blade; 28. Mounting plate. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0032] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Please see Figures 1 to 8 The embodiments provided by this utility model are as follows:

[0036] Example: An atmospheric sampling device, comprising:

[0037] A cylindrical barrel 1 is detachably mounted on the upper end of cylindrical barrel 1. A barrel groove 2 is opened at the upper end of cylindrical barrel 2. A filter screen 12 is fixed at the bottom inside the barrel groove 2. An installation ring 13 is fixed inside the filter screen 12. A fixing plate 19 is fixed at the upper end inside the barrel groove 2. A threaded plate 20 is detachably mounted inside the fixing plate 19. A hydrophobic microporous membrane 21 is fixed inside the threaded plate 20. A rubber sealing ring 22 is fixed inside the hydrophobic microporous membrane 21. A pipe 8 is fixed inside the rubber sealing ring 22. An installation plate 28 is fixed inside the pipe 8. A fan blade 27 is rotatably connected to the lower end of the installation plate 28. A threaded rod 11 is fixed at the bottom end of the fan blade 27.

[0038] The bottom end of the threaded rod 11 passes through the mounting ring 13 and extends into the cylindrical barrel 1. The bottom end of the threaded rod 11 passes through the movable disk 23 and is threadedly connected.

[0039] Efficient air sampling and particulate matter enrichment are achieved through modular design. Cylinder 1 serves as the basic container, forming a double-layer structure with Cylinder 2. The trough 6 at the upper end of Cylinder 2 constitutes the filter chamber.

[0040] When outside air is drawn in through pipe 8, the fan blades 27 driven by motor 10 generate negative pressure airflow, which is dynamically adjusted by the moving disc 23 linked by threaded rod 11. The air first impacts the filter screen 12 below the fixed disc 19, whose mounting ring 13 ensures rigid support for the filter screen 12 to intercept large particles. The threaded connection between the threaded disc 20 and the fixed disc 19 allows for quick replacement of the hydrophobic microporous membrane 21, which forms an airtight isolation layer with the rubber sealing ring 22. The mounting plate 28 not only fixes the motor 10 but also forms a directional airflow channel through the pipe hole 9, allowing the filtered air to enter the collection area of ​​the cylindrical container 1 in an orderly manner.

[0041] Liquid 7 is placed in tank 26. Liquid 7 is located above hydrophobic microporous membrane 21. The surface of hydrophobic microporous membrane 21 is superhydrophobic. Water cannot pass through the micropores due to surface tension, while gas molecules can pass through freely.

[0042] The liquid 7 inside the tank 6 and the hydrophobic microporous membrane 21 form a dual protection mechanism. Liquid 7 prevents collected foreign matter from escaping, while the hydrophobic microporous membrane 21, due to its superhydrophobic properties, blocks the liquid 7, preventing it from mixing with the collected foreign particles. The surface tension of liquid 7 forms a liquid barrier on the membrane surface, effectively preventing particle escape while allowing gas molecules to pass through freely. This design significantly improves the particle retention rate, and the liquid 7 layer also helps prevent foreign matter from escaping.

[0043] A threaded hole is opened at the upper end of the fixed plate 19, and a sealing rubber I is installed on the internal thread of the threaded hole. An external thread is opened on the outer wall of the threaded plate 20, and a sealing rubber II is installed on the external thread. The threaded plate 20 extends into the threaded hole opened at the upper end of the fixed plate 19, and the internal thread is connected to the external thread. The sealing rubber I and the sealing rubber II are fitted together.

[0044] The fixed disc 19 and the threaded disc 20 employ a sealed structure to ensure the system's airtightness. A sealing rubber I is pre-installed inside the threaded hole of the fixed disc 19, forming a nested sealing interface with the sealing rubber II on the outer wall of the threaded disc 20. When the threaded disc 20 is screwed in, the two sealing rubbers undergo elastic deformation, generating radial pressure. This prevents liquid 7 from leaking through the threaded gap and also avoids unfiltered air short-circuiting into the collection area. The threaded connection facilitates disassembly and maintenance.

[0045] A pipe hole 9 is opened at the upper end of the pipe 8, and the mounting plate 28 is fixed in the pipe hole 9. The motor 10 is fixed at the upper end of the mounting plate 28, and the fan blade 27 is fixed at the drive end of the motor 10.

[0046] The pipe hole 9 at the top of pipe 8 integrates the power module and airflow control function. Mounting plate 28 serves as the mounting base for motor 10. Motor 10 directly drives fan blades 27 to generate axial airflow, with adjustable speed to adapt to different sampling flow rate requirements. The optimized ratio of the pipe hole diameter 9 to the fan blade diameter ensures a uniform airflow velocity distribution on the filter screen 12 surface, preventing particle penetration due to excessively high local flow velocities. This integrated design reduces energy consumption while ensuring sampling flow rate stability.

[0047] A mounting hole 17 is provided at the lower end of the cylindrical barrel 2, and the filter screen 12 is fixed in the mounting hole 17.

[0048] The filter screen 12 is fixed inside the mounting hole 17 at the bottom of the cylindrical barrel 2. The matching design of the diameter of the mounting hole 17 and the effective filtration area of ​​the filter screen 12 ensures that the pressure drop when the airflow passes through the filter screen 12 is controlled within a reasonable range, which ensures sufficient contact time to capture particulate matter and avoids overloading of the motor 10 due to excessive resistance.

[0049] A groove 5 is opened at the upper end of the cylindrical barrel 1, and the bottom end of the threaded rod 11 extends into the groove 5 through the pipe hole 9.

[0050] The trough 5 at the upper end of the cylindrical barrel 1 serves as a temporary storage chamber for filtered air and forms a linkage mechanism with the threaded rod 11. The threaded rod 11 extends into the trough 5 through the pipe hole 9, so that when the fan blade 27 rotates, the threaded rod 11 synchronously drives the moving disk 23 to perform axial displacement. The trough 5 not only serves as an airflow buffer space, but also precisely controls the raising and lowering of the moving disk 23 through the rotation of the threaded rod 11, thereby adjusting the open or closed state of the airflow path.

[0051] A limiting groove 4 is opened at one end of the inner wall of the barrel trough 5. A threaded hole is opened at the upper end of the movable disk 23. The bottom end of the threaded rod 11 passes through the threaded hole opened in the movable disk 23 and is threadedly connected. A movable plate 24 is fixed at one end of the outer wall of the movable disk 23. One end of the movable plate 24 is inserted into the limiting groove 4. A connecting plate 25 is fixed at the other end of the outer wall of the movable disk 23. A baffle 26 is fixed at the lower end of the connecting plate 25.

[0052] The limiting groove 4 on the inner wall of the trough 5 and the moving plate 24 of the moving disk 23 form a guiding mechanism, ensuring that the moving disk 23 can only move axially and will not deflect. The threaded rod 11 engages with the threaded hole of the moving disk 23, allowing the moving disk 23 to smoothly rise and fall along the threaded rod 11 when the motor 10 drives the fan blade 27 to rotate. The baffle 26 at the lower end of the connecting plate 25 gradually closes the airflow channel as the moving disk 23 descends, forming a staged sampling control. When the baffle 26 completely covers the connecting pipe 15, the airflow is cut off, and the sampling process automatically stops, allowing the user to accurately control the sampling duration. This mechanical linkage design requires no additional sensors and can achieve sampling timing management solely through threaded transmission.

[0053] A connecting pipe 15 is installed on one end of the outer wall of the cylindrical barrel 1. A connecting pipe 14 is inserted into the connecting pipe 15. A collection bucket 3 is installed on one end of the connecting pipe 14. Valves are installed on the upper ends of the outer walls of the connecting pipe 14 and the connecting pipe 15.

[0054] The connecting pipe 15 on the outer wall of cylindrical container 1 and the connecting pipe 14 on the outer wall of collection container 3 form a detachable sampling interface. After connecting pipe 14 is inserted into connecting pipe 15, the airflow is regulated by a valve to direct the filtered air into collection container 3. This design allows collection container 3 to be replaced at any time during sampling, avoiding cross-contamination, while the valve structure ensures no gas leakage during disassembly. Collection container 3 can be independently sealed and sent for testing, improving the accuracy of the test data.

[0055] One end of the baffle 26 is arc-shaped and fits against the inner wall of the barrel groove 5.

[0056] The arc-shaped end face of the baffle 26 precisely fits against the inner wall of the barrel trough 5, forming a dynamic sealing structure. As the moving disc 23 descends, the baffle 26 slides along the inner wall of the barrel trough 5, gradually reducing the cross-sectional area of ​​the airflow channel, and ultimately completely sealing the inlet of the connecting pipe 15. The arc-shaped design reduces frictional resistance, ensuring smooth movement of the baffle 26. This structure automatically cuts off the airflow at the end of sampling, preventing backflow of outside air into the collected samples and improving the reliability of the sampling data.

[0057] The lower end of the second cylinder 2 has an annular threaded groove 16, and the upper end of the first cylinder 1 has a fixed threaded ring 18. The threaded ring 18 extends into the annular threaded groove 16 and is threadedly connected.

[0058] The annular screw groove 16 at the lower end of cylindrical barrel 2 and the threaded ring 18 at the upper end of cylindrical barrel 1 form a quick-release mechanism. The threaded connection ensures good airtightness when the two barrels are joined, preventing unfiltered air from seeping in through the joint. The depth of the annular screw groove 16 matches the pitch of the threaded ring 18, so that cylindrical barrel 2 and cylindrical barrel 1 form a rigid whole after tightening, and will not loosen during sampling. This design facilitates the user's disassembly and cleaning of the filter screen 12 or replacement of the hydrophobic microporous membrane 21, while ensuring structural stability after repeated assembly.

[0059] In this embodiment, when performing atmospheric sampling, the operator first needs to securely assemble the first cylinder 1 and the second cylinder 2 using the threaded connection between the threaded ring 18 and the annular screw groove 16 to ensure the overall airtightness of the sampling system. After installation, the motor 10 is started, and its output shaft directly drives the fan blade 27 to rotate at high speed inside the pipe 8, forming a stable negative pressure gradient inside the system.

[0060] In the airflow path, outside air is first drawn into the tank 6. At this time, the pre-filled liquid 7 and the hydrophobic microporous membrane 21 form a dual protection system: the collected foreign particles are between the filter screen 12 and the hydrophobic microporous membrane 21, and at the same time, the hydrophobic microporous membrane 21 and the liquid 7 can shield the upper part of the collected foreign particles to prevent them from flying away. This can collect foreign particles while preventing them from mixing with the liquid 7, which facilitates the detection of the collected foreign particles.

[0061] As the airflow continues to descend, the precisely calculated filter 12 begins its filtration function. The filter 12 is securely fixed within the mounting hole 17 by the mounting ring 13; its mesh size is optimized to efficiently intercept suspended particulate matter. The captured particles continuously accumulate on the surface of the filter 12, while the purified air enters the buffer space of the trough 5.

[0062] The entire sampling process is accompanied by ingenious mechanical linkages. The operation of motor 10 not only drives fan blade 27 to generate negative pressure, but also drives moving disk 23 to perform axial displacement through threaded rod 11. Due to the precise fit between moving plate 24 and limiting groove 4, moving disk 23 is restricted to linear motion only. This allows baffle 26 at the end of connecting plate 25 to move smoothly downwards along a preset trajectory, gradually adjusting the cross-sectional area of ​​the airflow channel.

[0063] At the end of the sampling period, the arc-shaped edge of the baffle 26 forms a complete seal with the inner wall of the first tank 5, completely blocking the air intake channel of the second connecting pipe 15. At this time, the operator can close the valves on the first connecting pipe 14 and the second connecting pipe 15 to safely separate the collection tank 3 from the system. Throughout the sampling cycle, the synergistic effect of the hydrophobic microporous membrane 21 and the liquid 7 continues to play a key role, preventing the secondary escape of collected particles and ensuring the representativeness of the gas sample. This achieves the effect of simultaneously separating and sampling air and foreign particles in the atmosphere, improving the versatility and efficiency of the function, while also facilitating installation and disassembly.

[0064] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An atmospheric sampling device, characterized in that... ,include: A cylindrical barrel (1) is provided. A cylindrical barrel (2) is detachably installed on the upper end of the cylindrical barrel (1). A barrel groove (6) is provided on the upper end of the cylindrical barrel (2). A filter screen (12) is fixed at the bottom inside the barrel groove (6). A mounting ring (13) is fixed inside the filter screen (12). A fixing plate (19) is fixed at the upper end inside the barrel groove (6). A threaded plate (20) is detachably installed inside the fixing plate (19). A hydrophobic microporous membrane (21) is fixed inside the threaded plate (20). A rubber sealing ring (22) is fixed inside the hydrophobic microporous membrane (21). A pipe (8) is fixed inside the rubber sealing ring (22). An installation plate (28) is fixed inside the pipe (8). A fan blade (27) is rotatably connected to the lower end of the installation plate (28). A threaded rod (11) is fixed at the bottom end of the fan blade (27). The bottom end of the threaded rod (11) passes through the mounting ring (13) and extends into the cylindrical barrel (1). The bottom end of the threaded rod (11) passes through the movable disk (23) and is threadedly connected.

2. An atmospheric sampling device according to claim 1, characterized in that: Liquid (7) is placed in the second tank (6). The liquid (7) is located above the hydrophobic microporous membrane (21). The surface of the hydrophobic microporous membrane (21) is superhydrophobic. Water cannot pass through the micropores due to surface tension, while gas molecules can pass through freely.

3. An atmospheric sampling device according to claim 1, characterized in that: The upper end of the fixed disk (19) has a threaded hole, and a sealing rubber is installed on the inner thread of the threaded hole. The outer wall of the threaded disk (20) has an external thread, and a sealing rubber is installed on the external thread. The threaded disk (20) extends into the threaded hole at the upper end of the fixed disk (19), and the inner thread is connected to the outer thread. The sealing rubber is fitted with the sealing rubber.

4. An atmospheric sampling device according to claim 1, characterized in that: The pipe (8) has a pipe hole (9) at the upper end, the mounting plate (28) is fixed in the pipe hole (9), the mounting plate (28) has a motor (10) fixed at the upper end, and the motor (10) has a fan blade (27) fixed at the drive end.

5. An atmospheric sampling device according to claim 1, characterized in that: The lower end of the cylindrical barrel (2) has an installation hole (17), and the filter screen (12) is fixed in the installation hole (17).

6. An atmospheric sampling device according to claim 4, characterized in that: The upper end of the cylindrical barrel (1) is provided with a barrel groove (5), and the bottom end of the threaded rod (11) extends into the barrel groove (5) through the pipe hole (9).

7. An atmospheric sampling device according to claim 6, characterized in that: A limiting groove (4) is opened at one end of the inner wall of the barrel trough (5). A threaded hole is opened at the upper end of the movable disk (23). The bottom end of the threaded rod (11) passes through the threaded hole opened in the movable disk (23) and is threadedly connected. A movable plate (24) is fixed at one end of the outer wall of the movable disk (23). One end of the movable plate (24) is inserted into the limiting groove (4). A connecting plate (25) is fixed at the other end of the outer wall of the movable disk (23). A baffle plate (26) is fixed at the lower end of the connecting plate (25).

8. An atmospheric sampling device according to claim 1, characterized in that: A connecting pipe 2 (15) is installed on one end of the outer wall of the cylindrical barrel 1 (1). A connecting pipe 1 (14) is inserted into the connecting pipe 2 (15). A collection bucket (3) is installed on one end of the connecting pipe 1 (14). Valves are installed on the upper ends of the outer walls of the connecting pipe 1 (14) and the connecting pipe 2 (15).

9. An atmospheric sampling device according to claim 7, characterized in that: One end of the baffle (26) is arc-shaped, and the other end of the baffle (26) is attached to the inner wall of the barrel groove (5).

10. An atmospheric sampling device according to claim 1, characterized in that: The lower end of the second cylindrical barrel (2) has an annular screw groove (16), and the upper end of the first cylindrical barrel (1) is fixed with a threaded ring (18). The threaded ring (18) extends into the annular screw groove (16) and is threadedly connected.

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