Gas sampling device

Abstract

The utility model provides a gas sampling device and belongs to the technical field of body sampling. Comprising a sampling instrument, the upper end of the sampling instrument is communicated with a sampling pipe, the upper end of the sampling pipe is fixedly provided with a connecting block, the connecting block is provided with a cavity, the connecting block is provided with a connecting hole communicated with the cavity and the sampling pipe, the inner wall of the connecting hole is fixedly provided with a filter screen, and the upper end face of the filter screen and the inner bottom wall of the cavity are located on the same horizontal plane; a rotating shaft is rotationally arranged on the inner bottom wall of the cavity, a plurality of driving impellers which are located on the same horizontal plane and annularly distributed around the outer wall of the rotating shaft at equal intervals are fixed to the outer wall of the rotating shaft, a scraper is fixed to the outer wall of the rotating shaft and located at the lower ends of the driving impellers, and the lower end of the scraper is attached to the inner bottom wall of the cavity. According to the utility model, impurities in gas can be effectively filtered out, and the sampling quality is prevented from being influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas sampling and relates to a gas sampling device. Background Art

[0002] Air pollution, also known as atmospheric pollution, is usually defined by the International Organization for Standardization (ISO) as: the phenomenon that certain substances enter the atmosphere due to human activities or natural processes, presenting a sufficient concentration for a sufficient time and thus harming human comfort, health and welfare or the environment. Gas sampling is the process of collecting samples of pollutants or polluted air in the atmosphere, and the degree of air pollution is judged by detecting the sampled gas.

[0003] A patent document with the publication number of CN220508552U discloses a gas sampling device, which includes a support plate. An fixing plate is fixedly installed on the surface of the support plate. The number of the fixing plates is two, and a gas collecting tank is rotatably installed between the fixing plates. One end of the gas collecting tank is connected with a sampling pipe through a threaded connection. An angle adjusting component is hinged to one side of the gas collecting tank. On the surface of the support plate and on one side of the fixing plate, an air pump is fixedly installed. The output end of the air pump is fixedly installed with an output pipe, and the other end of the output pipe extends into the gas collecting tank. An installation frame is fixedly installed on the lower surface of the support plate.

[0004] However, the above prior art still has the following deficiencies:

[0005] The gas sampling device in the prior art may sample gas containing dust during sampling. Since the sampling device lacks a filtering component, the device may be blocked during the sampling process, affecting the normal progress of the sampling work and being difficult to clean. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and propose a gas sampling device to solve the technical problem that the gas sampling device in the prior art mentioned in the background art cannot filter gas containing dust, resulting in the dust drawn into the gas sampling device during the sampling process blocking the device.

[0007] To achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A gas sampling device includes a sampler. The upper end of the sampler is connected to a sampling tube. A connecting block is fixed to the upper end of the sampling tube. The connecting block has a cavity. The connecting block is provided with a connecting hole that communicates the cavity and the sampling tube. A filter screen is fixed to the inner wall of the connecting hole. The upper end surface of the filter screen is at the same horizontal plane as the inner bottom wall of the cavity. An air inlet pipe is provided at one end of the connecting block. The air inlet pipe is communicated with the cavity. A rotating shaft is rotatably provided on the inner bottom wall of the cavity. A plurality of driving impellers are fixed to the outer wall of the rotating shaft. The driving impellers are located at the same horizontal plane and are annularly and equally spaced around the outer wall of the rotating shaft. A scraping plate is fixed to the outer wall of the rotation. The scraping plate is located below the plurality of driving impellers. The lower end of the scraping plate is in contact with the inner bottom wall of the cavity.

[0009] Working principle:

[0010] Drive the sampler to extract air. The outside air enters the cavity through the air inlet pipe. The gas entering the cavity will drive the rotating shaft to rotate through the driving impeller. The rotating shaft drives the scraping plate to rotate synchronously. The scraping plate scrapes the impurities on the surface of the filter screen.

[0011] The beneficial effects of the present utility model are as follows:

[0012] By setting the connecting block, the filter screen, the scraping plate, the rotating shaft, and the driving impeller, when driving the sampler to extract air, the gas entering the cavity will drive the rotating shaft to rotate through the driving impeller. The rotating shaft drives the scraping plate to rotate synchronously. The scraping plate scrapes the impurities on the surface of the filter screen. The scraping plate can effectively prevent the filter screen from being blocked and affecting the sampling efficiency. At the same time, the filter screen can filter the impurities in the air, effectively preventing the gas containing dust from being extracted into the sampler and affecting the subsequent detection quality. Description of the drawings

[0013] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0014] Figure 2 is a side cross-sectional view of the connecting block and the air inlet pipe of an embodiment of the present utility model;

[0015] Figure 3 is a top cross-sectional view of the connecting block and the air inlet pipe of an embodiment of the present utility model;

[0016] Figure 4 is a side cross-sectional view of the connecting block of an embodiment of the present utility model.

[0017] Description of the reference numerals: 1. Sampler; 2. Sampling tube; 3. Connecting block; 4. Cavity; 5. Connecting hole; 6. Filter screen; 7. Intake pipe; 8. Rotating shaft; 9. Driving impeller; 10. Scraper; 11. Annular groove; 12. Annular block; 13. Air intake hole; 14. Round hole; 15. Guide block; 16. Guide groove; 17. Sealing block; 18. Opening; 19. Annular retaining ring; 20. Limiting groove; 21. Limiting block; 22. Spring; 23. Card slot; 24. Protrusion; 25. Limiting hole; 26. Pointing block; 27. Pointing line; 28. Anti-slip rubber block. Detailed implementation manners

[0018] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0019] As Figures 1-3 shown, a gas sampling device includes a sampler 1. The sampler 1 refers to an instrument or device for collecting air pollutants or polluted air. The upper end of the sampler 1 is communicated with a sampling tube 2. The upper end of the sampling tube 2 is fixed with a connecting block 3. The connecting block 3 has a cavity 4. The connecting block 3 is provided with a connecting hole 5 communicating the cavity 4 and the sampling tube 2. The inner wall of the connecting hole 5 is fixed with a filter screen 6. The upper end surface of the filter screen 6 and the inner bottom wall of the cavity 4 are on the same horizontal plane. One end of the connecting block 3 is provided with an intake pipe 7. The intake pipe 7 is communicated with the cavity 4. The inner bottom wall of the cavity 4 is rotatably provided with a rotating shaft 8. The outer wall of the rotating shaft 8 is fixed with a plurality of driving impellers 9 located on the same horizontal plane and annularly and equidistantly distributed around the outer wall of the rotating shaft 8. The outer wall of the rotating shaft 8 is fixed with a scraper 10. The scraper 10 is located below the plurality of driving impellers 9. The lower end of the scraper 10 is in contact with the inner bottom wall of the cavity 4. When the sampler 1 is driven to extract air, the gas entering the cavity 4 will drive the rotating shaft 8 to rotate through the driving impeller 9. The rotating shaft 8 drives the scraper 10 to rotate synchronously. The scraper 10 scrapes the impurities on the surface of the filter screen 6.

[0020] As Figure 1 and Figure 2As shown, the connecting block 3 is cylindrical. The outer wall of the connecting block 3 has an annular groove 11. An annular block 12 is embedded in the annular groove 11. The intake pipe 7 is fixed on the annular block 12. Both the upper and lower ends of the annular block 12 have annular guide blocks 15. Annular guide grooves 16 for respectively embedding the two guide blocks 15 are formed in the upper and lower walls of the annular groove 11. An air intake hole 13 communicating with the intake pipe 7 is formed in the annular block 12. Three circular holes 14 with different radii are equidistantly formed in the side wall of the connecting block 3. All three circular holes 14 are respectively communicated with the cavity 4. After the annular block 12 rotates around the connecting block 3, the air intake hole 13 can be communicated with one of the circular holes 14. The radius of the air intake hole 13 is the same as the inner pipe radius of the intake pipe 7. The radius of one of the circular holes 14 is the same as the radius of the air intake hole 13, and the radii of the other two circular holes 14 are respectively larger and smaller than the radius of the air intake hole 13. By pushing the intake pipe 7, the annular block 12 can be driven to rotate along the annular groove 11. When the air intake hole 13 is communicated with the circular hole 14 with the smallest radius, according to the venturi effect, when the air flow flows from the open area into the narrow area, since the atmosphere can be regarded as an incompressible fluid, the air quality cannot accumulate in large quantities in the narrow area, so it accelerates through this area, making the wind speed increase. When the wind speed increases, the incoming gas drives the rotating shaft 8 to rotate through the driving impeller 9, and makes the rotating speed of the rotating shaft 8 increase, so that the frequency of the scraper 10 cleaning the impurities on the surface of the filter screen 6 becomes faster. When the air intake hole 13 is communicated with the circular hole 14 with the largest radius, the wind speed decreases. When the wind speed decreases, the incoming gas drives the rotating shaft 8 to rotate through the driving impeller 9, and makes the rotating speed of the rotating shaft 8 decrease, so that the frequency of the scraper 10 cleaning the impurities on the surface of the filter screen 6 becomes slower.

[0021] As Figure 1 、 2As shown in Fig. 4, a sealing block 17 is detachably installed on the top of the connecting block 3. An opening 18 is formed at the top of the connecting block 3 for the sealing block 17 to be embedded and communicate with the cavity 4. A circular retaining ring 19 is fixed to the top of the sealing block 17. The lower end of the circular retaining ring 19 can abut against the top of the connecting block 3. Two symmetrically arranged limiting grooves 20 are formed on the outer wall of the sealing block 17. A limiting block 21 is slidably arranged in the limiting groove 20. A spring 22 is fixed between the limiting block 21 and the inner wall of the limiting groove 20. Two symmetrically arranged clamping grooves 23 are formed on the inner wall of the opening 18 for one end of each of the two corresponding limiting blocks 21 to be embedded. A convex block 24 is fixed to the top of the limiting block 21. A limiting hole 25 is formed at the top of the sealing block 17 for the convex block 24 to pass through and communicate with the limiting groove 20. One end of the convex block 24 is fixed with an anti-slip rubber block 28 located above the connecting block 3. A pointing block 26 is fixed to the upper end of the air inlet pipe 7. Three pointing lines 27 corresponding to the three circular holes 14 are engraved on the top of the connecting block 3. By simultaneously pushing the two convex blocks 24 closer to each other, the convex block 24 drives the limiting block 21 to move along the limiting groove 20 until the limiting block 21 disengages from the clamping groove 23, and then pulling the convex block 24 upward can detach the sealing block 17 from the connecting block 3, facilitating the cleaning of the connecting block 3.

[0022] The specific operation method of the present invention is as follows:

[0023] By pushing the air inlet pipe 7, the annular block 12 can be driven to rotate along the annular groove 11, and the pointing block 26 at the top of the air inlet pipe 7 is aligned with one of the pointing lines 27. At this time, the air inlet hole 13 is communicated with one of the circular holes 14. The sampling instrument 1 is driven to extract air. The outside air sequentially enters the cavity 4 through the air inlet pipe 7, the air inlet hole 13, and one of the circular holes 14. The gas entering the cavity 4 drives the rotating shaft 8 to rotate through the driving impeller 9. The rotating shaft 8 drives the scraper 10 to rotate synchronously. The scraper 10 scrapes the impurities on the surface of the filter net 6. The gas passes through the filter net 6 to filter the impurities and then enters the sampling instrument 1 through the sampling pipe 2.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A gas sampling device, comprising a sampler (1), wherein the upper end of the sampler (1) is connected to a sampling tube (2), characterized in that: A connection block (3) is fixed to the upper end of the sampling tube (2), the connection block (3) having a cavity (4), the connection block (3) having a connection hole (5) communicating the cavity (4) and the sampling tube (2), a filter screen (6) is fixed to the inner wall of the connection hole (5), the upper end surface of the filter screen (6) and the inner bottom wall of the cavity (4) are located at the same horizontal plane, an air inlet pipe (7) is provided at one end of the connection block (3), the air inlet pipe (7) is connected to the cavity (4), a rotating shaft (8) is rotatably provided on the inner bottom wall of the cavity (4), a plurality of driving impellers (9) located at the same horizontal plane and distributed around the outer wall of the rotating shaft (8) at equal intervals are fixed to the outer wall of the rotating shaft (8), a scraper (10) is fixed to the outer wall of the rotating shaft (8), the scraper (10) is located at the lower end of the plurality of driving impellers (9), and the lower end of the scraper (10) is in contact with the inner bottom wall of the cavity (4).

2. A gas sampling device according to claim 1, characterized in that: The connecting block (3) is cylindrical, and the outer wall of the connecting block (3) has an annular groove (11). An annular block (12) is embedded in the annular groove (11). The air intake pipe (7) is fixed on the annular block (12). The annular block (12) has an air intake hole (13) connected to the air intake pipe (7). The side wall of the connecting block (3) has three circular holes (14) with different radii at equal intervals. The three circular holes (14) are all connected to the cavity (4). After the annular block (12) rotates around the connecting block (3), the air intake hole (13) can be connected to one of the circular holes (14). The radius of the air intake hole (13) is the same as the inner pipe radius of the air intake pipe (7). The radius of one of the circular holes (14) is the same as the radius of the air intake hole (13), and the radii of the other two circular holes (14) are respectively larger and smaller than the radius of the air intake hole (13).

3. A gas sampling device according to claim 2, characterized in that: The annular block (12) has annular guide blocks (15) at the upper and lower ends, and the upper and lower walls of the annular groove (11) are provided with annular guide grooves (16) for embedding the two guide blocks (15) respectively.

4. A gas sampling device according to claim 1, characterized in that: A sealing block (17) is detachably mounted on the top of the connection block (3); an opening (18) is provided on the top of the connection block (3) for the sealing block (17) to be embedded and communicate with the cavity (4); an annular retaining ring (19) is fixed on the top of the sealing block (17); and the lower end of the annular retaining ring (19) can abut against the top of the connection block (3).

5. A gas sampling device according to claim 4, characterized in that: The outer wall of the sealing block (17) is provided with two symmetrically arranged limiting grooves (20), a limiting block (21) is slidably arranged in the limiting groove (20), a spring (22) is fixed between the limiting block (21) and the inner wall of the limiting groove (20), the inner wall of the opening (18) is provided with two symmetrically arranged clamping grooves (23) for two corresponding ends of the limiting blocks (21) to be embedded, a protrusion (24) is fixed on the top of the limiting block (21), and a limiting hole (25) is provided on the top of the sealing block (17) for the protrusion (24) to pass through and communicate with the limiting groove (20).

6. A gas sampling device according to claim 5, characterized in that: An anti-slip rubber block (28) located at the upper end of the connecting block (3) is fixed to one end of the protruding block (24).

7. A gas sampling device according to claim 2, characterized in that: A pointing block (26) is fixed to the upper end of the air inlet pipe (7), and three pointing lines (27) corresponding to the three circular holes (14) are engraved on the top of the connecting block (3).

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