Air intake system and self-cleaning cabin positive pressure air filter using the same

Abstract

This utility model relates to the field of air filter technology, and discloses an air intake system and a self-exhausting dust chamber positive pressure air filter using the same. The system includes an air intake hood, an air inlet section, an intermediate shell, a rear shell assembly, a rear shell cover, and connecting brackets. The air intake hood is installed in front of the air inlet section by screws. The rear end of the air inlet section is detachably and sealed to the front end of the intermediate shell, and the rear end of the intermediate shell is detachably and sealed to the front end of the rear shell assembly via two connecting brackets. The rear shell cover is detachably installed at the rear end of the rear shell assembly. The intermediate shell, rear shell assembly, and rear shell cover are all hollow cylindrical shapes. A pre-filter is installed inside the air inlet section and the intermediate shell. A guide vane mounting hole is formed in the center of the pre-filter, and a fan motor is fixed inside the guide vane mounting hole. A fan wheel is fixed to the drive end of the fan motor. This utility model can effectively filter dust and other impurities in the air, while increasing the pressure inside the chamber to prevent external dust and other pollutants from entering, thus ensuring air quality.

Description

Technical Field

[0001] This utility model relates to the field of air filter technology, and in particular to an air intake system and a positive pressure air filter for a self-exhausting dust chamber using the same. Background Technology

[0002] In high-dust environments such as mines, construction sites, and newly built tunnels, the air quality is poor, and directly inhaling air containing impurities can affect the health of workers. For example, drivers of vehicles and machinery working in high-dust environments may experience health problems if they operate the cab in a dusty environment for extended periods, and in severe cases, may even develop pneumoconiosis.

[0003] There are also some air filters in the prior art, such as the Chinese invention patent with application number CN202210118244.4 entitled "Cavity Air Filter", which discloses a cabin air filter that can be configured to remove gaseous molecular pollutants and VOCs without obstructing airflow. It can be cleaned and reused periodically. However, it is mainly used in the air inlet outside the passenger compartment of a vehicle and has a decentralized structure, which is not convenient for direct integration.

[0004] For example, Chinese utility model patent application number CN202420139824.6, entitled "A Dual-Channel Composite Air Filter for Heavy Vehicles," improves the tightness of the engagement between the lower and upper housings and facilitates disassembly of the upper and lower housings. However, it does not investigate the specific operation and components of the air filter. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide an air intake system and a self-exhausting dust chamber positive pressure air filter using the same, which can effectively filter dust and other impurities in the air, provide clean air, and at the same time increase the pressure inside the chamber to prevent external dust, impurities and other pollutants from entering, thereby further ensuring the air quality inside the chamber.

[0006] This utility model is achieved using the following technical solution: an air intake system, comprising an air intake section, a fan wheel, and a fan motor, wherein:

[0007] The air intake section includes the rear cover and the front cover;

[0008] The rear cover is circular, and the front cover is integrally formed with the rear cover. The front cover is funnel-shaped, and a first air inlet is provided at the center of the front end of the front cover. The first air inlet is used to allow dust-containing air to enter.

[0009] The fan impeller is located inside the front section of the air inlet section, with its center close to and directly facing the first air inlet. It includes a rear fan cover and centrifugal fan guide vanes composed of several vertically arranged blades. The rear fan cover is circular, and the fan guide vanes are used to centrifugally compress and eject the dust-laden air entering from the first air inlet. In conjunction with the aforementioned funnel-shaped front cover, the centrifugally ejected air (at which point the angle of ejection is perpendicular to the fan impeller axis) moves downwards along the inner wall of the funnel-shaped front cover. This causes the dust-laden air concentrated from the first air inlet to move downwards along the inner wall of the front cover under the action of the centrifugal fan, forming a cylindrical airflow. Furthermore, the dust-laden air is centrifugally ejected, and the direction of this ejection is tangential to the tail of the fan blades (the specific structure of which is described in the following paragraph). Therefore, the air moves in a rotating direction around the fan wheel axis. Upon encountering the inner wall of the front cover, it continues to rotate and move downwards along the inner wall. This rotational motion, under the influence of centrifugal force, causes the dust to tend to move towards the inner wall within the airflow. This tendency contributes to the centrifugal dust removal effect.

[0010] It is also equipped with a fan motor to drive the fan wheel.

[0011] Furthermore, the air intake section also includes an air intake grille, which is installed inside the first air intake.

[0012] Furthermore, the fan wheel also includes a front fan cover, and a second air inlet is provided at the center of the front end of the front fan cover, which is close to and directly opposite the first air inlet; the rear end of the front fan cover and the front end of the rear fan cover are connected and fixed by multiple fan guide vanes, the front fan cover is trumpet-shaped, and the fan guide vanes are evenly distributed at intervals with the axial center of the rear fan cover as dots.

[0013] Furthermore, it also includes an air intake shroud, which is mounted in front of the air intake section by screws.

[0014] A self-exhausting dust chamber positive pressure air filter includes an air inlet hood, an air inlet section, an intermediate shell, a rear shell assembly, a rear shell cover, and connecting brackets. The air inlet hood is installed in front of the air inlet section by screws. The rear end of the air inlet section is detachably and sealed to the front end of the intermediate shell, and the rear end of the intermediate shell is detachably and sealed to the front end of the rear shell assembly by two connecting brackets. The rear shell cover is detachably installed in the rear end of the rear shell assembly. The intermediate shell, rear shell assembly, and rear shell cover are all hollow cylindrical shapes. A pre-filter is provided inside the air inlet section and the intermediate shell. A front guide vane mounting hole is formed in the center of the pre-filter, and a fan motor is fixed in the front guide vane mounting hole. The fan motor has a fan wheel fixed to its drive end. The fan wheel is located in the front section inside the air inlet section. An intermediate guide fluid is provided in the rear section inside the intermediate shell. Inertial separation blade rings are spaced apart on the outer wall of the rear end of the intermediate guide fluid. An air outlet pipe is connected to the bottom end of the intermediate guide fluid. The air outlet pipe passes through the intermediate shell and extends to its outer side. An air filter element is sandwiched between the rear side of the intermediate guide fluid and the front end of the rear shell cover. The air filter element is located in the center of the intermediate shell, the rear shell assembly, and the rear shell cover, so that an air channel is formed between the outer side of the air filter element and the inner wall of the intermediate shell, the rear shell assembly, and the rear shell cover. A dust discharge port is provided at the rear bottom end of the rear shell cover. A front guide blade is provided on the outer wall of the front guide blade mounting hole.

[0015] The pre-filter serves two purposes: firstly, it houses the fan motor; secondly, it houses the guide vanes on its outer wall, which rotate the air. The previous air intake system already caused the air to rotate and move downwards along the inner wall of the front shroud. The addition of the guide vanes further enhances this rotational effect, thereby increasing the centrifugal dust removal efficiency.

[0016] Furthermore, an intermediate guide fluid is provided in the rear section of the intermediate shell behind the pre-filter.

[0017] Furthermore, the bottom end of the intermediate guide fluid is connected to an air outlet pipe, the outlet end of which passes through the intermediate shell and extends to its outer side, and the inlet end of the outlet end of the air outlet pipe is connected to the upper part of the air filter element.

[0018] Furthermore, the air intake section includes a rear cover, a front cover, an outer cover ring, an air intake grille, and threaded column seats. The rear cover is circular, and the front cover is integrally formed with the rear cover. The front cover is funnel-shaped, and the outer cover ring is located on the outside of the rear cover. A first air intake is provided at the center of the front end of the front cover, and the air intake grille is installed inside the first air intake. Threaded column seats integrally formed with the air intake grille are symmetrically arranged on both sides of the air intake grille.

[0019] Furthermore, the fan wheel includes a front fan cover, a rear fan cover, and fan guide vanes. A second air inlet is provided at the center of the front end of the front fan cover. The rear end of the front fan cover and the front end of the rear fan cover are connected and fixed by multiple fan guide vanes. The front fan cover is trumpet-shaped, the rear fan cover is circular, and the fan guide vanes are evenly distributed with the axial center of the rear fan cover as dots.

[0020] Furthermore, the intermediate shell includes an intermediate shell, an intermediate front shell ring, an intermediate rear shell ring, an intermediate shell inner sleeve, and an intermediate shell outer inner sleeve. An intermediate front shell ring is provided on the front outer wall of the intermediate shell, and an intermediate rear shell ring is provided on the rear outer wall of the intermediate shell. The intermediate shell inner sleeve is fixed in the center of the intermediate rear shell ring, and the intermediate shell outer inner sleeve is located in the center of the intermediate shell inner sleeve. The height of the intermediate shell inner sleeve is higher than the height of the intermediate shell outer inner sleeve, and a third air inlet is provided in the center of the intermediate shell outer inner sleeve.

[0021] Furthermore, when the upper part of the air passage inside the air filter is closed, the position on the rear cover directly opposite the lower part of the air passage inside the air filter is set to be open, so that the air inside the air filter can be discharged from the lower part of the air passage inside the air filter.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. This utility model discloses a self-exhausting dust chamber positive pressure air filter. A fan motor drives a fan impeller to rotate at high speed, drawing external air into the intake section through the first intake port at the front of the front cover. Air then enters through the second intake port in the center of the front fan cover, is centrifugally compressed by the fan guide vanes, and is expelled outwards between the rear and rear fan covers. Under the action of the fan impeller, airflow and dust are pushed to the vicinity of the duct wall. A cyclone pre-filter further pushes impurities towards the wall. After separation by the inertial separation blade ring assembly, most dust is separated and discharged near the dust outlet. The pre-purified air then passes through the air filter element, where it is further filtered and discharged from the top of the air filter element through the outlet end of the air pipe to the outside of the intermediate shell. This provides clean air while increasing the pressure inside the chamber, preventing external dust and other pollutants from entering and further ensuring the air quality inside the chamber.

[0024] 2. The present invention provides a positive pressure air filter for a self-exhausting dust chamber. By providing an intermediate guide fluid in the rear section of the inner shell, the air can eliminate the air vortex zone when it flows through the guide fluid after passing through the pre-filter. This allows the air from the pre-filter end to enter the inertial separation blade ring assembly more smoothly, thereby reducing resistance and improving the inertial separation effect of impurities. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 ;

[0026] Figure 2 This is the right view of this utility model;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 ;

[0028] Figure 4 This is the front view of this utility model;

[0029] Figure 5 yes Figure 4 Sectional view along axis AA;

[0030] Figure 6 This is a schematic diagram of the structure of this utility model after removing the air intake cover, air intake section, intermediate shell, and connecting frame;

[0031] Figure 7 This is a schematic diagram of the air inlet section in this utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the rear cover in this utility model;

[0033] Figure 9 This is a schematic diagram of the connecting frame in this utility model;

[0034] Figure 10 This is a schematic diagram of the connecting frame in this utility model;

[0035] Figure 11 This is a diagram showing the separation of the wind turbine wheel in this utility model;

[0036] Figure 12 This is a schematic diagram of the connection structure between the intermediate shell and the intermediate fluid guide in this utility model;

[0037] Figure 13 This is a schematic diagram of the structure of the intermediate shell in this utility model;

[0038] Figure 14 This is a schematic diagram of the rear shell assembly in this utility model;

[0039] Figure 15 This is a schematic diagram of the air circulation inside the device during operation.

[0040] In the diagram: 1. Inlet shroud; 2. Inlet section; 3. Intermediate shell; 4. Rear shell assembly; 5. Rear shell cover; 6. Connecting frame; 7. Fan wheel; 8. Pre-filter; 9. Fan motor; 10. Intermediate guide tube; 11. Inertial separation blade ring assembly; 12. Air filter element; 21. Rear cover; 22. Front cover; 23. Outer cover ring; 24. Inlet grille; 25. Threaded column base; 31. Outlet pipe; 32. Intermediate shell; 33. Intermediate front... Shell ring-33; Middle rear shell ring-34; Middle shell inner sleeve-35; Middle shell outer inner sleeve-36; Buckle-41; Rear shell-42; Rear shell front ring-43; Rear shell rear ring-44; Lower shell cover-51; Lower shell ring-52; Inner sleeve ring-53; Retaining ring-54; Dust outlet-55; Upper clamp sleeve-61; Lower clamp seat-62; Inner groove-63; Front fan cover-71; Rear fan cover-72; Fan guide vane-73. Detailed Implementation

[0041] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0042] The purpose of this invention is to address the shortcomings of existing technologies by providing a positive pressure air filter for a self-exhausting dust chamber. Example

[0043] This embodiment provides a self-exhausting dust chamber positive pressure air filter, see reference. Figure 1 As shown, it includes an air intake shroud 1, an air intake section 2, an intermediate shell 3, a rear shell assembly 4, a rear shell cover 5, and a connecting bracket 6. The air intake shroud 1 is installed in front of the air intake section 2 by screws. The rear end of the air intake section 2 is detachably and sealed to the front end of the intermediate shell 3, and the rear end of the intermediate shell 3 is detachably and sealed to the front end of the rear shell assembly 4 by two connecting brackets 6. The rear shell cover 5 is detachably installed in the rear end of the rear shell assembly 4.

[0044] Reference Figures 2-6As shown, the intermediate shell 3, rear shell assembly 4, and rear shell cover 5 are all hollow cylindrical shapes. A pre-filter 8 is installed inside the air inlet section 2 and the intermediate shell 3. A guide vane mounting hole is formed in the center of the pre-filter 8, and a fan motor 9 is fixed inside the guide vane mounting hole. A fan wheel 7 is fixed to the drive end of the fan motor 9. The fan wheel 7 is located in the front section inside the air inlet section 2. An intermediate guide fluid 10 is installed in the rear section inside the intermediate shell 3. Inertial separators are spaced apart on the outer wall of the rear end of the intermediate guide fluid 10. The blade ring assembly 11 has an air outlet pipe 31 connected to the bottom end of the intermediate guide fluid 10. The air outlet pipe 31 passes through the intermediate shell 3 and extends to its outer side. An air filter element 12 is sandwiched between the rear side of the intermediate guide fluid 10 and the front end of the rear shell cover 5. The air filter element 12 is located in the center of the intermediate shell 3, the rear shell assembly 4, and the rear shell cover 5, so that an air channel is formed between the outer side of the air filter element 12 and the inner wall of the intermediate shell 3, the rear shell assembly 4, and the rear shell cover 5. A dust discharge port 55 is provided at the bottom rear part of the rear shell cover 5.

[0045] When the positive pressure air filter in the dust collection chamber is working, the fan motor 9 drives the fan wheel 7 to rotate at high speed, drawing in external air. After being guided by the pre-filter 8, the air flows to the intermediate guide fluid 10. The intermediate guide fluid 10 eliminates the vortex zone at the rear of the pre-filter 8, allowing the air from the pre-filter 8 to enter the inertial separation blade ring assembly 11 on the rear outer wall of the intermediate guide fluid 10 more smoothly. This reduces resistance and improves the inertial separation effect. After being separated by the inertial separation blade ring assembly 11, larger particulate impurities in the air are filtered by the air filter element 12 and discharged from the dust outlet 55. The pre-purified air then passes through the air filter element 12 for further filtration of impurities. After filtration, the air enters the interior of the air filter element 12, and the purified clean air flows upward from inside the filter element and is discharged through the air outlet pipe 31 connected to the bottom of the intermediate guide fluid 10.

[0046] This solves the problem of poor air quality in the cabs, operating rooms, and temporary housing of vehicles and equipment in high-dust environments, and the failure of the working environment for drivers and indoor staff to meet standards, thereby improving the air quality within the space. This self-exhausting dust-filled positive pressure air filter can supply air to the cabin independently or be connected to an existing air conditioning fresh air system as the intake air for the cabin's air conditioning fresh air system.

[0047] Reference Figure 7As shown, the air intake section 2 includes a rear cover 21, a front cover 22, an outer cover ring 23, an air intake grille 24, and a threaded column base 25. The rear cover 21 is circular, and the front cover 22 is integrally formed with the rear cover 21. The front cover 22 is funnel-shaped, and the outer cover ring 23 is located on the outside of the rear cover 21. A first air intake is provided at the center of the front end of the front cover 22, and the air intake grille 24 is installed inside the first air intake. Threaded column bases 25 integrally formed with the air intake grille 24 are symmetrically arranged on both sides of the air intake grille 24. The air intake cover 1 is fixed to the threaded column base 25 by long screws, so that the air intake cover 1 is fixed in front of the air intake section 2.

[0048] Reference Figure 8 As shown, the rear cover 5 includes a lower cover 51, a lower cover ring 52, an inner ring 53, and a retaining ring 54. The lower cover ring 52 is integrally formed and disposed at the front end of the lower cover 51. The lower cover ring 52 is provided with a pin corresponding to the position of the buckle 41. The pin is connected to the buckle 41, so that the rear cover 5 can be easily installed and removed from the rear end of the rear cover assembly 4. The inner ring 53 is disposed at the bottom of the lower cover 51. The retaining ring 54 is integrally formed and disposed on the inner ring 53. The dust outlet 55 is located below the retaining ring 54.

[0049] Reference Figure 9 As shown, the connecting frame 6 includes an upper clamp sleeve 61, a lower clamp seat 62, and an inner groove 63. The upper clamp sleeve 61 is fixed to the upper end of the lower clamp seat 62 by bolts. An inner groove 63 is provided on the inner side of the upper clamp sleeve 61 and the lower clamp seat 62. A sealing ring is provided in the inner groove 63, so that the air inlet section 2 and the intermediate shell 3, and the intermediate shell 3 and the rear shell assembly 4 can be easily sealed and connected or disassembled.

[0050] Reference Figures 10-11 As shown, the fan impeller 7 specifically includes a front fan cover 71, a rear fan cover 72, and fan guide vanes 73. A second air inlet is located at the center of the front end of the front fan cover 71. The rear end of the front fan cover 71 and the front end of the rear fan cover 72 are connected and fixed by multiple fan guide vanes 73. The front fan cover 71 is trumpet-shaped, and the rear fan cover 72 is circular. The fan guide vanes 73 are evenly spaced with the axial center of the rear fan cover 72 as dots, allowing air to enter through the second air inlet at the center of the front end of the front fan cover 71, be centrifugally compressed by the fan guide vanes 73, and then be expelled outwards between the rear end of the front fan cover 71 and the rear fan cover 72. In this embodiment, the fan impeller 7 is a centrifugal impeller with a blade outer diameter of 120~180mm. The fan motor 9 can be driven by a 24V brushless motor with a maximum speed of not less than 4500rpm.

[0051] Reference Figures 12-13As shown, the intermediate shell 3 includes an intermediate shell 32, an intermediate front shell ring 33, an intermediate rear shell ring 34, an intermediate shell inner sleeve 35, and an intermediate shell outer inner sleeve 36. An intermediate front shell ring 33 is provided on the front outer wall of the intermediate shell 32, and an intermediate rear shell ring 34 is provided on the rear outer wall of the intermediate shell 32. The intermediate shell inner sleeve 35 is fixed in the center of the intermediate rear shell ring 34, and the intermediate shell outer inner sleeve 36 is located in the center of the intermediate shell inner sleeve 35. The height of the intermediate shell inner sleeve 35 is higher than the height of the intermediate shell outer inner sleeve 36, and a third air inlet is provided in the center of the intermediate shell outer inner sleeve 36.

[0052] Reference Figure 14 As shown, the rear shell assembly 4 includes a buckle 41, a rear shell 42, a front ring 43, and a rear ring 44. The front ring 43 is disposed on the front outer wall of the rear shell 42, and the rear ring 44 is disposed on the rear outer wall of the rear shell 42. Several buckles 41 are also provided at intervals on the rear outer wall of the rear shell 42.

[0053] This utility model discloses a self-exhausting dust chamber positive pressure air filter, which can either supply air to the chamber independently or be connected to an existing air conditioning fresh air system as the air intake for the chamber's air conditioning fresh air system. When supplying air to the chamber, the filter can be installed on the outer wall of the chamber, with an opening in the chamber wall for connection to the filter's air outlet pipe 31; the filter is fixed to the outer wall of the chamber via a connecting bracket 6.

[0054] Reference Figure 15 As shown in the figure, the arrows indicate the airflow direction inside the filter when it is working. During operation, the fan motor 9 drives the fan wheel 7 to rotate at high speed, causing external air to be drawn into the air inlet section 2 from the first air inlet at the front end of the front cover 22, and then enters through the second air inlet in the center of the front fan cover 71. After being centrifugally compressed by the fan guide vanes 73, it is sent out from between the rear end of the front fan cover 71 and the rear fan cover 72.

[0055] The delivered air flows through the intermediate guide fluid 10 after being guided by the pre-filter 8. The intermediate guide fluid 10 eliminates the air vortex zone at the rear of the pre-filter 8, allowing the air from the pre-filter 8 to enter the inertial separation blade ring assembly 11 more smoothly, thereby reducing resistance and improving the inertial separation effect. During this process, under the action of the fan impeller 7, airflow and dust are sent to the vicinity of the duct wall, and then the impurities are further pushed towards the wall by the cyclone pre-filter 8. After separation by the inertial separation blade ring assembly 11, most of the dust is separated and discharged near the dust outlet 55. The pre-purified air then passes to the air filter element 12 for further filtration of impurities. After filtration, the air enters the interior of the air filter element 12, and the purified clean air flows upward from the inside of the filter element and is discharged through the air outlet pipe 31 connected to the bottom of the intermediate guide fluid 10. This provides clean air to the cabin, increases the pressure inside the cabin, prevents external dust and other pollutants from entering, and further ensures the air quality inside the cabin. Example

[0056] Compared with Example 1, when the upper part of the air filter (12) is closed, the rear cover (5) is set to be open at the hollow part inside the air filter (12) so that the air inside the air filter (12) can be discharged from the lower part of the air filter (12).

Claims

1. An air intake system characterized by: It includes the air inlet section (2), the fan wheel (7), and the fan motor (9), wherein: The air intake section (2) includes the rear cover (21) and the front cover (22); The rear cover (21) is circular, and the front cover (22) is integrally formed with the rear cover (21). The front cover (22) is funnel-shaped, and a first air inlet is provided at the center of the front end of the front cover (22). The first air inlet is used to enter dusty air. The fan wheel (7) is located in the front section inside the air inlet section (2), with its center close to and directly facing the first air inlet. It includes a rear fan cover (72) and a centrifugal fan guide vane (73) composed of several vertically arranged blades. The rear fan cover (72) is circular, and the fan guide vane (73) is used to centrifuge and throw out the dust-containing air that enters from the first air inlet. It is also equipped with a fan motor (9) to drive the fan wheel (7).

2. An air induction system according to claim 1, wherein: The air intake section (2) also includes an air intake grille (24), which is installed inside the first air intake.

3. An air induction system as claimed in claim 1, wherein: The fan wheel (7) also includes a front fan cover (71), and a second air inlet is provided at the center of the front end of the front fan cover (71) and is close to and directly opposite the first air inlet; the rear end of the front fan cover (71) and the front end of the rear fan cover (72) are connected and fixed by multiple fan guide vanes (73), the front fan cover (71) is horn-shaped, and the fan guide vanes (73) are evenly distributed with the axial center of the rear fan cover (72) as dots.

4. An air induction system as claimed in any one of claims 1 to 3, wherein: It also includes an air intake shroud (1), which is mounted in front of the air intake section (2) by screws.

5. A self-dusting cabin positive pressure air filter characterized by, Includes the air intake system as described in claim 4, the intermediate shell (3), the rear shell assembly (4), the rear shell cover (5), and the air filter (12). The air intake system includes an air intake section (2), a fan, and a fan motor (9) that drives the fan to work. The fan discharges the dust-containing air that enters the air intake section (2) downwards. The intermediate shell (3) is connected to the lower edge of the air inlet section (2), the rear shell assembly (4) is connected to the lower edge of the intermediate shell (3), and the rear shell cover (5) is connected to the lower edge of the rear shell assembly (4). The intermediate shell (3) and the rear shell assembly (4) are hollow cylindrical shapes connected in sequence. The rear shell cover (5) is a round bottom cover. The rear bottom of the rear shell cover (5) is provided with a dust discharge port (55). The air filter (12) is disposed in the center inside the middle shell (3) and the rear shell assembly (4), so that an external air channel is formed between the outer side of the air filter (12) and the inner wall of the middle shell (3), the rear shell assembly (4) and the rear shell cover (5). The air filter (12) is hollow inside, forming an internal air channel. The dust-laden air in the external air channel enters the air filter (12) from the outside of the air filter (12). When the rear cover (5) closes the bottom of the air passage inside the air filter (12), the air inside the air filter (12) is discharged from the top of the air passage inside the air filter (12); An inertial separation blade ring group (11) is provided at intervals on the outer wall of the intermediate shell (3).

6. A self-dusting chamber positive air filter as claimed in claim 5, wherein, It also includes the air intake section (2), which includes the rear cover (21) and the front cover (22); The rear cover (21) is circular, and the front cover (22) is integrally formed with the rear cover (21). The front cover (22) is funnel-shaped, and a first air inlet is provided at the center of the front end of the front cover (22). The first air inlet is used to enter dusty air. The fan wheel (7) is located in the front section inside the air inlet section (2), with its center close to and directly facing the first air inlet. It includes a rear fan cover (72) and a centrifugal fan guide vane (73) composed of several vertically arranged blades. The rear fan cover (72) is circular, and the fan guide vane (73) is used to centrifugally compress the dust-containing air entering from the first air inlet and then throw it out. It is also equipped with a fan motor (9) to drive the fan wheel (7).

7. A self-dusting chamber positive air filter as claimed in claim 6, wherein, The air inlet section (2) and the intermediate shell (3) are provided with a pre-filter (8). A guide vane mounting hole is formed in the center of the pre-filter (8). A fan motor (9) is fixed in the guide vane mounting hole. A guide vane is provided on the outer wall of the guide vane mounting hole.

8. A self-dusting chamber positive air filter as claimed in claim 7, wherein, Behind the pre-filter (8), an intermediate guide fluid (10) is provided in the rear section of the interior of the intermediate shell (3).

9. A self-dusting cabin positive air filter as claimed in claim 8, characterized in that The bottom end of the intermediate guide fluid (10) is connected to an air outlet pipe (31). The outlet end of the air outlet pipe (31) passes through the intermediate shell (3) and extends to its outer side. The inlet end of the outlet end of the air outlet pipe (31) is connected to the upper part of the internal air channel of the air filter element (12).

10. A self-dusting cabin positive air filter as defined in claim 7 wherein, When the upper part of the air passage inside the air filter (12) is closed, the position of the rear cover (5) facing the lower part of the air passage inside the air filter (12) is set to be open, so that the air inside the air filter (12) can be discharged from the lower part of the air passage inside the air filter (12).

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