A portable air pollution detection device

Abstract

This invention relates to the field of air pollution detection technology and discloses a portable air pollution detection device, including a housing with a top cover. An air inlet is located within the housing's inner cavity, and an air inlet cylinder is installed on the inner wall of the air inlet. An air inlet sealing cylinder is slidably connected to the inner wall of the air inlet cylinder, and an air inlet pipe is fixedly sleeved on the outer wall of the air inlet sealing cylinder. By rotating a rotating bracket, the filter element rotates, switching its position between the air inlet and outlet ends. When the filter element becomes clogged with dust due to long-term use, it is rotated to the outlet sealing cylinder. The air discharged from the outlet sealing cylinder then back-blown to clean the dust on the filter element surface. Filter element maintenance can be completed without disassembling the device, making the operation simple and efficient. The airflow to the cleaned filter element is significantly increased, effectively avoiding insufficient airflow caused by filter clogging, ensuring the detection accuracy of the particulate matter sensor and the temperature and humidity sensor, and extending the filter element's service life.

Description

Technical Field

[0001] This invention relates to the field of air pollution detection technology, specifically to a portable air pollution detection device. Background Technology

[0002] With the acceleration of industrialization and the densification of urban populations, air pollution has become an increasingly prominent problem. Particulate matter, harmful gases, and changes in temperature and humidity in the air can all have a significant impact on human health and the ecological environment. Against this backdrop, air pollution detection devices have become important tools for people to monitor the surrounding air quality and avoid pollution risks. Portable detection devices, in particular, are widely used in various scenarios such as daily travel, outdoor work, and environmental inspections because they can be used anytime and anywhere.

[0003] Currently, there are still many shortcomings in existing portable air pollution detection devices: First, the air intake filter structure of most devices is inconvenient to clean, and the device needs to be disassembled for maintenance, which is cumbersome and time-consuming. After long-term use, the filter element is easily blocked by large dust particles, resulting in insufficient air intake, which in turn affects the detection accuracy and the stability of device operation. Summary of the Invention

[0004] This invention provides a portable air pollution detection device that solves the problems mentioned in the background art.

[0005] This invention provides the following technical solution: a portable air pollution detection device, comprising a housing, a top cover on the top of the housing, an air inlet hole in the inner cavity of the housing, an air inlet cylinder installed on the inner wall of the air inlet hole, an air inlet sealing cylinder slidably connected to the inner wall of the air inlet cylinder, an air inlet pipe fixedly sleeved on the outer wall of the air inlet sealing cylinder, a central connecting pipe fixedly sleeved at the end of the air inlet pipe away from the air inlet sealing cylinder, and an air extraction pipe fixedly sleeved at the end of the central connecting pipe away from the air inlet pipe, the outer wall of the air extraction pipe being fitted with... The device is equipped with a guide tube, an exhaust fan blade inside the exhaust pipe, an exhaust pipe on the inner wall of the guide tube, a particulate matter sensor and a temperature and humidity sensor on the inner wall of the middle connecting pipe, a switching shaft inside the outer shell, a rotating bracket at the bottom of the switching shaft, a protective cylinder on the inner wall of the rotating bracket, a filter element inside the protective cylinder, a control board inside the outer shell, a display screen and an input module on the inner wall of the top cover, and a hand handle on the outer wall of the outer shell.

[0006] As a preferred embodiment of the present invention, an exhaust pipe is installed at the end of the exhaust pipe away from the guide pipe, and an exhaust sealing cylinder is installed at the end of the exhaust pipe away from the exhaust pipe. An exhaust hole is opened on the outer wall of the outer shell, and an exhaust cylinder is installed on the inner wall of the exhaust hole. The exhaust sealing cylinder is slidably connected to the exhaust cylinder.

[0007] As a preferred embodiment of the present invention, the inner wall of the air outlet cylinder is provided with an air outlet limiting groove, the outer wall of the air outlet sealing cylinder is provided with an air outlet limiting block, the air outlet limiting block is slidably connected to the air outlet limiting groove, the inner wall of the air inlet cylinder is provided with an air inlet limiting groove, the outer wall of the air inlet sealing cylinder is provided with an air inlet limiting block, the air inlet limiting block is slidably connected to the air inlet limiting groove.

[0008] As a preferred embodiment of the present invention, the outer wall of the air inlet sealing cylinder is provided with an air inlet sealing groove, and an air inlet sealing ring is installed on the inner wall of the air inlet sealing groove; the outer wall of the air outlet sealing cylinder is provided with an air outlet sealing groove, and an air outlet sealing ring is installed on the inner wall of the air outlet sealing groove.

[0009] As a preferred embodiment of the present invention, a rotating shaft is installed on the inner wall of the exhaust fan blade, and a rotating handle is installed at the end of the rotating shaft away from the exhaust fan blade. The rotating shaft is movably connected to the guide tube and the central connecting tube.

[0010] As a preferred embodiment of the present invention, an air inlet sealing column is installed on the outer wall of the air inlet sealing cylinder, an air outlet sealing column is installed on the outer wall of the air outlet sealing cylinder, and the air outlet pipe and the air inlet pipe are corrugated pipes.

[0011] As a preferred embodiment of the present invention, a rotating plate is installed on the outer wall of the switching shaft, an arc plate is installed on the outer edge of the rotating plate, a top groove is opened in the middle of the arc plate, an arc-shaped spring plate is installed on the inner wall of the top groove, and a left support plate and a right support plate are respectively installed at both ends of the arc-shaped spring plate, and the right support plate and the left support plate are not connected.

[0012] As a preferred embodiment of the present invention, a left-side release groove is provided on the left side of the top of the arc plate, and a right-side release groove is provided on the right side of the top of the arc plate. The left-side release groove and the right-side release groove are connected to the top groove.

[0013] As a preferred embodiment of the present invention, the display screen is electrically connected to the control board, the input module is electrically connected to the control board, the top cover is mounted on the outer casing, and the switching shaft is rotatably connected to the outer casing and the top cover.

[0014] As a preferred embodiment of the present invention, the inner cavity of the hand handle is provided with a battery module, the battery module is electrically connected to the control board, and the inner wall of the hand handle is equipped with a charging module, the charging module being electrically connected to the battery module.

[0015] The present invention has the following beneficial effects: 1. This portable air pollution detection device rotates the filter element by rotating the support, switching the filter element's position between the inlet and outlet ends. When the filter element becomes clogged with dust due to long-term use, rotating it to the outlet sealing cylinder allows the air discharged from the outlet sealing cylinder to back-blow and clean the dust on the filter element surface. Filter element maintenance can be completed without disassembling the device, making it simple and efficient. The air intake flow of the cleaned filter element is significantly increased, effectively avoiding insufficient air intake caused by filter element clogging, ensuring the detection accuracy of the particulate matter sensor and temperature and humidity sensor, and extending the service life of the filter element.

[0016] 2. This portable air pollution detection device can manually drive the exhaust fan to extract air by rotating the handle, shaft, and exhaust fan blades. It does not rely on electric components, effectively solving the problem of easy failure of electric exhaust components under extreme temperature and humidity conditions. This allows the device to operate normally in various harsh environments such as high temperature and low temperature, expanding the applicability of the device. At the same time, the manual exhaust mode can also serve as a backup for electric exhaust, further improving the operational reliability of the device.

[0017] 3. This portable air pollution detection device rotates the rotating bracket, which drives the rotating plate and the arc plate to rotate. When the arc plate rotates, it moves the air inlet sealing cylinder and the air outlet sealing cylinder outward, so that the air inlet sealing cylinder and the air outlet sealing cylinder come into contact. This effectively seals the gap between the rotating bracket and the outer shell, preventing air leakage during air intake or exhaust. It ensures that the extracted air can fully contact the particulate matter sensor and the temperature and humidity sensor, thus guaranteeing the accuracy and reliability of the detection data. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the top three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the bottom three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the vertical cross-section of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the diagram; Figure 6 This is a schematic diagram of the arc plate structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B in the diagram; Figure 8 This is a schematic diagram of the cross-sectional structure of the present invention.

[0019] In the diagram: 1. Outer shell; 2. Top cover; 3. Air inlet; 4. Air inlet cylinder; 5. Air outlet; 6. Air outlet cylinder; 7. Air inlet limiting groove; 8. Air inlet sealing cylinder; 81. Air inlet sealing groove; 82. Air inlet sealing ring; 9. Air inlet limiting block; 10. Air outlet limiting groove; 11. Air outlet sealing cylinder; 111. Air outlet sealing groove; 112. Air outlet sealing ring; 12. Air outlet limiting block; 13. Air inlet sealing column; 14. Air outlet sealing column; 15. Air inlet pipe; 16. Middle connecting pipe; 17. Guide pipe; 18. Extraction pipe; 19. Rotating shaft; 20. 21. Exhaust fan blade; 22. Rotary handle; 23. Exhaust pipe; 24. Air outlet pipe; 25. Particulate matter sensor; 26. Temperature and humidity sensor; 27. Control board; 28. Display screen; 29. ​​Input module; 20. Switching shaft; 31. Rotating bracket; 32. Protective cylinder; 33. Filter element; 34. Rotating plate; 35. Arc plate; 36. Top groove; 37. Left release groove; 38. Right release groove; 39. Arc-shaped spring plate; 40. Right support plate; 41. Left support plate; 42. Hand handle; 43. Battery module; 44. Charging module. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-8 A portable air pollution detection device includes a housing 1, a top cover 2 on the top of the housing 1, an air inlet 3 in the inner cavity of the housing 1, an air inlet cylinder 4 installed on the inner wall of the air inlet 3, an air inlet sealing cylinder 8 slidably connected to the inner wall of the air inlet cylinder 4, an air inlet pipe 15 fixedly sleeved on the outer wall of the air inlet sealing cylinder 8, a middle connecting pipe 16 fixedly sleeved at the end of the air inlet pipe 15 away from the air inlet sealing cylinder 8, and an exhaust pipe 18 fixedly sleeved at the end of the middle connecting pipe 16 away from the air inlet pipe 15, a guide pipe 17 installed on the outer wall of the exhaust pipe 18, and the exhaust pipe 1... The inner cavity of 8 is equipped with an exhaust fan blade 20, the inner wall of the guide pipe 17 is equipped with an exhaust pipe 22, the inner wall of the middle connecting pipe 16 is equipped with a particulate matter sensor 24 and a temperature and humidity sensor 25, the inner cavity of the outer shell 1 is equipped with a switching shaft 29, the bottom of the switching shaft 29 is equipped with a rotating bracket 30, the inner wall of the rotating bracket 30 is equipped with a protective cylinder 31, the inner cavity of the protective cylinder 31 is equipped with a filter element 32, the inner cavity of the outer shell 1 is equipped with a control board 26, the inner wall of the top cover 2 is equipped with a display screen 27 and an input module 28, and the outer wall of the outer shell 1 is equipped with a hand handle 41.

[0022] In the above structure, the air outside the outer casing 1 can be drawn into the middle connecting pipe 16 and the guide pipe 17 by rotating the exhaust fan blade 20. Then the air is discharged through the exhaust pipe 22, the air outlet pipe 23 and the air outlet sealing cylinder 11. At this time, the air comes into contact with the particulate matter sensor 24 and the temperature and humidity sensor 25. The particulate matter sensor 24 and the temperature and humidity sensor 25 obtain corresponding data. Long-term use will cause large dust particles to enter the filter element 32, making it difficult for air to enter the middle connecting pipe 16. By rotating the rotating bracket 30, the filter element 32 is positioned at the air outlet sealing cylinder 11, so that the air discharged from the air outlet sealing cylinder 11 can clean the dust on the filter element 32, so that the air flow of the cleaned filter element 32 is greater than that of the uncleaned filter element 32.

[0023] In a preferred embodiment: an exhaust pipe 23 is installed at the end of the exhaust pipe 22 away from the guide pipe 17, and an exhaust sealing cylinder 11 is installed at the end of the exhaust pipe 23 away from the exhaust pipe 22. An exhaust hole 5 is opened on the outer wall of the outer shell 1, and an exhaust cylinder 6 is installed on the inner wall of the exhaust hole 5. The exhaust sealing cylinder 11 and the exhaust cylinder 6 are slidably connected.

[0024] In the above structure, by setting the air outlet pipe 23, when the filter element 32 is far away from the air outlet sealing cylinder 11, the air outlet sealing cylinder 11 will shrink into the interior of the outer shell 1. At this time, the distance between the air outlet sealing cylinder 11 and the exhaust pipe 22 will become shorter, so it is necessary to connect them through the air outlet pipe 23. The function of the air inlet pipe 15 and the air outlet pipe 23 is the same.

[0025] In a preferred embodiment: the inner wall of the air outlet cylinder 6 is provided with an air outlet limiting groove 10, the outer wall of the air outlet sealing cylinder 11 is provided with an air outlet limiting block 12, the air outlet limiting block 12 is slidably connected to the air outlet limiting groove 10, the inner wall of the air inlet cylinder 4 is provided with an air inlet limiting groove 7, the outer wall of the air inlet sealing cylinder 8 is provided with an air inlet limiting block 9, the air inlet limiting block 9 is slidably connected to the air inlet limiting groove 7.

[0026] In the above structure, by setting the outlet limiting block 12 and the outlet limiting groove 10, when the outlet sealing cylinder 11 moves, the outlet limiting block 12 and the outlet limiting groove 10 limit the movement, so that the outlet sealing cylinder 11 can only slide in the outlet cylinder 6 and cannot rotate. This allows the outlet sealing column 14 on the outlet sealing cylinder 11 to be stably in the left release groove 36. By setting the inlet limiting groove 7 and the inlet limiting block 9, when the inlet sealing cylinder 8 moves, the inlet limiting groove 7 and the inlet limiting block 9 limit the movement, so that the inlet sealing cylinder 8 can only slide in the inlet cylinder 4 and cannot rotate. This allows the inlet sealing column 13 on the inlet sealing cylinder 8 to be stably in the right release groove 37, thus improving the stability of the device operation.

[0027] In a preferred embodiment: an air inlet sealing groove 81 is provided on the outer wall of the air inlet sealing cylinder 8, and an air inlet sealing ring 82 is installed on the inner wall of the air inlet sealing groove 81; an air outlet sealing groove 111 is provided on the outer wall of the air outlet sealing cylinder 11, and an air outlet sealing ring 112 is installed on the inner wall of the air outlet sealing groove 111.

[0028] In the above structure, by setting the inlet sealing ring 82 and the outlet sealing ring 112, when the filter element 32 is located at the inlet sealing ring 82, the inlet sealing ring 82 is in contact with the rotating bracket 30, so that the gap between the rotating bracket 30 and the outer shell 1 is sealed, allowing air to stably pass through the filter element 32 and enter the middle connecting pipe 16. When the filter element 32 is located at the outlet sealing ring 112, the outlet sealing ring 112 is in contact with the rotating bracket 30, so that the gap between the rotating bracket 30 and the outer shell 1 is sealed, allowing air to stably pass through the filter element 32 and be discharged.

[0029] In a preferred embodiment: a rotating shaft 19 is installed on the inner wall of the exhaust fan blade 20, and a rotating handle 21 is installed at the end of the rotating shaft 19 away from the exhaust fan blade 20. The rotating shaft 19 is movably connected to the guide tube 17 and the central connecting tube 16.

[0030] In the above structure, by holding the rotating handle 21, rotating the rotating handle 21 will drive the rotating shaft 19 to rotate, so that the rotating shaft 19 will drive the exhaust fan blade 20 to rotate, so that the device can manually extract air. The device can be used in low temperature and high temperature environments.

[0031] In a preferred embodiment: an air inlet sealing column 13 is installed on the outer wall of the air inlet sealing cylinder 8, an air outlet sealing column 14 is installed on the outer wall of the air outlet sealing cylinder 11, and the air outlet pipe 23 and the air inlet pipe 15 are corrugated pipes.

[0032] In the above structure, by setting the air intake sealing column 13 and the air exhaust sealing column 14, when the arc plate 34 rotates, it will drive the air intake sealing column 13 and the air exhaust sealing column 14 to move inward and outward. When the air intake sealing column 13 moves inward, the air intake sealing cylinder 8 on the air intake sealing column 13 will move accordingly, so that the air intake sealing cylinder 8 will move away from the rotating bracket 30. When the air exhaust sealing column 14 moves outward, the air exhaust sealing cylinder 11 on the air exhaust sealing column 14 will move accordingly, so that the air exhaust sealing cylinder 11 moves towards the rotating bracket 30.

[0033] In a preferred embodiment: a rotating plate 33 is installed on the outer wall of the switching shaft 29, an arc plate 34 is installed on the outer edge of the rotating plate 33, a top groove 35 is opened in the middle of the arc plate 34, an arc-shaped spring plate 38 is installed on the inner wall of the top groove 35, and a left support plate 40 and a right support plate 39 are respectively installed at both ends of the arc-shaped spring plate 38, and the right support plate 39 and the left support plate 40 are not connected.

[0034] In the above structure, through the arrangement of the arc-shaped spring plate 38, the right support plate 39 and the left support plate 40, when the filter element 32 needs to reach the air outlet sealing cylinder 11, the rotating bracket 30 drives the arc plate 34 to rotate, so that the movement of the arc plate 34 causes the right support plate 39 to deform, gradually causing the air inlet sealing column 13 to enter the right release groove 37. At this time, the right release groove 37 can move the air inlet sealing column 13 inward. When the rotating bracket 30 rotates, it will also squeeze the air inlet sealing cylinder 8 inward, so that the air inlet sealing cylinder 8 moves away from the rotating bracket 30.

[0035] In a preferred embodiment: a left release groove 36 is provided on the left side of the top of the arc plate 34, and a right release groove 37 is provided on the right side of the top of the arc plate 34. The left release groove 36 and the right release groove 37 are connected to the top groove 35.

[0036] In the above structure, when the intake sealing column 13 is located in the top groove 35, the intake sealing column 13 moves towards the rotating bracket 30. When the intake sealing column 13 is located in the right release groove 37, the intake sealing column 13 moves inward. When the exhaust sealing column 14 is located in the top groove 35, the exhaust sealing column 14 moves towards the rotating bracket 30. When the exhaust sealing column 14 is located in the left release groove 36, the exhaust sealing column 14 is separated from the rotating bracket 30.

[0037] In a preferred embodiment: the display screen 27 is electrically connected to the control board 26, the input module 28 is electrically connected to the control board 26, the top cover 2 is mounted on the outer casing 1, and the switching shaft 29 is rotatably connected to the outer casing 1 and the top cover 2.

[0038] In the above structure, the information detected by the particulate matter sensor 24 and the temperature and humidity sensor 25 is transmitted to the control board 26. The control board 26 then processes the detected information and transmits it to the display screen 27, so that the data is displayed on the display screen 27 and the user can observe the air pollution status on the display screen 27.

[0039] In a preferred embodiment: a battery module 42 is provided in the inner cavity of the hand handle 41, the battery module 42 is electrically connected to the control board 26, and a charging module 43 is installed on the inner wall of the hand handle 41, the charging module 43 is electrically connected to the battery module 42.

[0040] In the above structure, the battery module 42 is placed in the hand handle 41. Since the battery module 42 is heavy, it is not easy to place it in the outer shell 1. If the battery module 42 is placed in the outer shell 1, it will cause the area away from the operator's hand to be heavy, which will cause hand pain when using the instrument for a long time. The battery module 42 supplies power to the control board 26, and the data cable is plugged into the charging module 43 to charge the battery module 42.

[0041] Working principle: During use, rotating the handle 21 drives the rotating shaft 19 and the exhaust fan blade 20 to rotate. The rotation of the exhaust fan blade 20 draws outside air into the guide tube 17 through the filter element 32, the air inlet sealing cylinder 8, the air inlet pipe 15, and the central connecting pipe 16. At this time, the particulate matter sensor 24 and the temperature and humidity sensor 25 have detected the air. The air in the guide tube 17 is discharged through the exhaust pipe 22, the air outlet pipe 23, and the air outlet sealing cylinder 11. The data detected by the particulate matter sensor 24 and the temperature and humidity sensor 25 are transmitted to the control board 26, and the control board 26 transmits the data to the display screen 27, which displays the data. When the filter element 32 needs to be cleaned, the rotating bracket 30 is rotated... As the rotating bracket 30 rotates, it drives the filter element 32 to rotate. This rotation causes the right-side support plate 39 to deform, allowing the intake sealing column 13 on the intake sealing cylinder 8 to enter the right-side release groove 37. At this time, the intake sealing column 13 and the intake sealing cylinder 8 move inwards. The rotating bracket 30 also pushes the intake sealing cylinder 8 inwards, gradually causing the exhaust sealing column 14 on the exhaust sealing cylinder 11 to contact the left-side support plate 40. This causes the left-side support plate 40 to deform, and the exhaust sealing column 14 gradually enters between the left-side support plate 40 and the right-side support plate 39. At this time, both the left-side and right-side support plates 40 and 39 simultaneously support the exhaust sealing column 14, causing it to move inwards towards the exhaust sealing cylinder 11. As the rotating bracket 30 moves closer, the exhaust sealing ring 112 on the exhaust sealing cylinder 11 comes into contact with the rotating bracket 30, sealing the gap between the rotating bracket 30 and the outer casing 1. Then, rotating the rotating handle 21 drives the rotating shaft 19 and the exhaust fan blade 20 to rotate. The exhaust fan blade 20 draws air through the intake sealing cylinder 8, the central connecting pipe 16, the guide pipe 17, the exhaust pipe 22, and the exhaust sealing cylinder 11. The air discharged from the exhaust sealing cylinder 11 can clean the dust on the filter element 32. When the filter element 32 needs to be adjusted to the intake sealing cylinder 8, the rotating bracket 30 is rotated clockwise. The rotation of the rotating bracket 30 causes the filter element 32 to rotate, resulting in deformation of the left support plate 40, thus facilitating the exhaust. The vent sealing column 14 on the sealing cylinder 11 enters the left release groove 36. At this time, the vent sealing column 14 and the vent sealing cylinder 11 move inward. When the rotating bracket 30 rotates, it also squeezes the vent sealing cylinder 11 inward, gradually causing the vent sealing cylinder 11 on the inlet sealing cylinder 8 to come into contact with the right support plate 39, causing the right support plate 39 to deform. The vent sealing cylinder 11 gradually enters between the left support plate 40 and the right support plate 39. At this time, the left support plate 40 and the right support plate 39 support the vent sealing cylinder 11 at the same time, causing the inlet sealing cylinder 8 and the inlet sealing column 13 to move closer to the rotating bracket 30. The inlet sealing ring 82 on the inlet sealing cylinder 8 will come into contact with the rotating bracket 30. At this time, the filter element 32 can be cleaned.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended technical solutions and their equivalents.

Claims

1. A portable air pollution detection device, comprising a housing (1), characterized in that: The outer shell (1) has a top cover (2) on its top. The inner cavity of the outer shell (1) has an air inlet (3). An air inlet cylinder (4) is installed on the inner wall of the air inlet (3). An air inlet sealing cylinder (8) is slidably connected to the inner wall of the air inlet cylinder (4). An air inlet pipe (15) is fixedly sleeved on the outer wall of the air inlet sealing cylinder (8). A middle connecting pipe (16) is fixedly sleeved on one end of the air inlet pipe (15) away from the air inlet sealing cylinder (8). An air extraction pipe (18) is fixedly sleeved on the other end of the middle connecting pipe (16) away from the air inlet pipe (15). A guide pipe (17) is installed on the outer wall of the air extraction pipe (18). An air extraction fan blade (20) is provided in the inner cavity of the air extraction pipe (18). The inner wall of the guide tube (17) is equipped with an exhaust pipe (22), the inner wall of the middle connecting pipe (16) is equipped with a particulate matter sensor (24) and a temperature and humidity sensor (25), the inner cavity of the outer shell (1) is equipped with a switching shaft (29), the bottom of the switching shaft (29) is equipped with a rotating bracket (30), the inner wall of the rotating bracket (30) is equipped with a protective cylinder (31), the inner cavity of the protective cylinder (31) is equipped with a filter element (32), the inner cavity of the outer shell (1) is equipped with a control board (26), the inner wall of the top cover (2) is equipped with a display screen (27) and an input module (28), and the outer wall of the outer shell (1) is equipped with a hand handle (41).

2. The portable air pollution detection device according to claim 1, characterized in that: The exhaust pipe (22) is equipped with an exhaust pipe (23) at one end away from the guide pipe (17), and an exhaust sealing cylinder (11) is installed at the other end of the exhaust pipe (23) away from the exhaust pipe (22). An exhaust hole (5) is opened on the outer wall of the outer shell (1), and an exhaust cylinder (6) is installed on the inner wall of the exhaust hole (5). The exhaust sealing cylinder (11) and the exhaust cylinder (6) are slidably connected.

3. The portable air pollution detection device according to claim 2, characterized in that: The inner wall of the air outlet cylinder (6) is provided with an air outlet limiting groove (10), and the outer wall of the air outlet sealing cylinder (11) is provided with an air outlet limiting block (12). The air outlet limiting block (12) is slidably connected to the air outlet limiting groove (10). The inner wall of the air inlet cylinder (4) is provided with an air inlet limiting groove (7), and the outer wall of the air inlet sealing cylinder (8) is provided with an air inlet limiting block (9). The air inlet limiting block (9) is slidably connected to the air inlet limiting groove (7).

4. A portable air pollution detection device according to claim 2, characterized in that: The outer wall of the air inlet sealing cylinder (8) is provided with an air inlet sealing groove (81), and an air inlet sealing ring (82) is installed on the inner wall of the air inlet sealing groove (81). The outer wall of the air outlet sealing cylinder (11) is provided with an air outlet sealing groove (111), and an air outlet sealing ring (112) is installed on the inner wall of the air outlet sealing groove (111).

5. A portable air pollution detection device according to claim 1, characterized in that: A rotating shaft (19) is installed on the inner wall of the exhaust fan blade (20). A rotating handle (21) is installed at the end of the rotating shaft (19) away from the exhaust fan blade (20). The rotating shaft (19) is movably connected to the guide tube (17) and the central connecting tube (16).

6. A portable air pollution detection device according to claim 2, characterized in that: The outer wall of the air inlet sealing cylinder (8) is equipped with an air inlet sealing column (13), the outer wall of the air outlet sealing cylinder (11) is equipped with an air outlet sealing column (14), and the air outlet pipe (23) and the air inlet pipe (15) are corrugated pipes.

7. A portable air pollution detection device according to claim 1, characterized in that: A rotating plate (33) is installed on the outer wall of the switching shaft (29). An arc plate (34) is installed on the outer edge of the rotating plate (33). A top groove (35) is opened in the middle of the arc plate (34). An arc-shaped spring plate (38) is installed on the inner wall of the top groove (35). A left support plate (40) and a right support plate (39) are respectively installed at both ends of the arc-shaped spring plate (38). The right support plate (39) and the left support plate (40) are not connected.

8. A portable air pollution detection device according to claim 7, characterized in that: The left side of the top of the arc plate (34) is provided with a left release groove (36), and the right side of the top of the arc plate (34) is provided with a right release groove (37). The left release groove (36) and the right release groove (37) are connected to the top groove (35).

9. A portable air pollution detection device according to claim 1, characterized in that: The display screen (27) is electrically connected to the control board (26), the input module (28) is electrically connected to the control board (26), the top cover (2) is mounted on the outer shell (1), and the switching shaft (29) is rotatably connected to the outer shell (1) and the top cover (2).

10. A portable air pollution detection device according to claim 1, characterized in that: The inner cavity of the hand handle (41) is provided with a battery module (42), which is electrically connected to the control board (26). The inner wall of the hand handle (41) is provided with a charging module (43), which is electrically connected to the battery module (42).

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