Positive pressure air filter of self-dust-discharging cabin

Abstract

The invention relates to the technical field of air filters, and discloses a self-dust-discharging cabin positive pressure air filter which comprises an air inlet cover, an air inlet section, a middle shell, a rear shell assembly, a rear shell cover and a connecting frame. The rear end of the air inlet section and the front end of the middle shell are detachably connected in a sealed mode through two connecting frames, the rear end of the middle shell and the front end of the rear shell assembly are detachably connected in a sealed mode through two connecting frames, and the rear shell cover is detachably installed at the rear end of the rear shell assembly. The middle shell, the rear shell assembly and the rear shell cover are all in the shape of a cylinder with the hollow center, a prefilter is arranged in the air inlet section and the middle shell, a front guide vane body mounting hole is formed in the center of the prefilter, a fan motor is fixed in the front guide vane body mounting hole, and a fan wheel is fixed to the driving end of the fan motor. Dust and other impurities in air can be effectively filtered, meanwhile, the pressure in the cabin is increased, external dust, impurities and other pollutants are prevented from entering the cabin, and the air quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of air filters, and in particular to a positive-pressure air filter for a self-dust exhausting cabin. Background Art

[0002] In high-dust environments such as mines, construction sites, and newly built tunnels, the air quality is poor, and directly inhaling impurities from the outside air can affect the health of workers. For example, drivers of vehicles and machinery working in high-dust environments will be affected by their health if they work in the cockpit in a high-dust environment for a long time, and in severe cases, they 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 and name Cabin Air Filter, which discloses a cabin air filter that can be configured to remove gaseous molecular pollutants and VOCs without hindering air flow and can be periodically cleaned and reused. However, it is mainly used in the air inlet outside the passenger compartment of the vehicle and has a decentralized structure, which is not convenient for direct integration.

[0004] Another example is the Chinese invention patent with application number CN202420139824.6, entitled A Dual-channel Composite Filter Air Filter for Heavy Vehicles, which can improve the tightness of the engagement between the lower shell and the upper shell, and facilitate the operation when removing the upper shell and the lower shell. However, it does not study the specific work and components of the filter air filter. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a self-dust exhaust cabin positive pressure air filter, which can effectively filter dust and other impurities in the air to provide clean air, while increasing the pressure in the cabin to prevent external dust impurities and other pollutants from entering, thereby further ensuring the air quality in the cabin.

[0006] The present invention is implemented by the following technical scheme: a self-dust exhaust cabin positive pressure air filter, comprising an air intake hood, an air intake section, an intermediate shell, a rear shell assembly, a rear shell cover and a connecting frame, wherein the air intake hood is installed in front of the air intake section by screws, and the rear end of the air intake section and the front end of the intermediate shell, and the rear end of the intermediate shell and the front end of the rear shell assembly are respectively detachably sealed and connected by two connecting frames, and the rear shell cover is detachably installed at the rear end of the rear shell assembly; the intermediate shell, the rear shell assembly and the rear shell cover are all cylindrical with a central hollow, and a pre-filter is arranged inside the air intake section and the intermediate shell, and a front guide vane mounting hole is formed in the center of the pre-filter, and the front guide vane mounting hole is provided in the front guide vane mounting hole. A fan motor is fixed, and a fan wheel is fixed to the driving end of the fan motor. The fan wheel is located in the front section inside the air inlet section, and an intermediate flow guide is provided in the rear section inside the intermediate shell. An inertial separation blade ring group is arranged at intervals on the outer wall of the rear end of the intermediate flow guide. The bottom end of the intermediate flow guide is connected with an air outlet pipe, and the air outlet pipe extends to the outside of the intermediate shell after passing through the intermediate shell. An air filter element is sandwiched between the rear side of the intermediate flow guide 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 walls of the intermediate shell, the rear shell assembly, and the rear shell cover. A dust outlet is provided at the rear bottom end of the rear shell cover. The air inlet section includes a rear cover body, a front cover body, an outer cover ring, an air inlet grille and a threaded column seat. The rear cover body is circular, and the front cover body is integrally formed with the rear cover body. The front cover body is funnel-shaped, and the outer cover ring is arranged on the outside of the rear cover body; a first air inlet is arranged at the front end center of the front cover body, and the air inlet grille is installed in the first air inlet, and threaded column seats integrally formed with the air inlet grille are symmetrically arranged on both sides of the air inlet grille.

[0007] Furthermore, the fan wheel includes a front fan cover, a rear fan cover and fan guide vanes, a second air inlet is arranged at the front center 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 a plurality of fan guide vanes, the front fan cover is trumpet-shaped, the rear fan cover is circular, and the fan guide vanes are evenly spaced with the axial center of the rear fan cover as a circle.

[0008] Further, 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. A circle of intermediate front shell ring is arranged on the front outer wall of the intermediate shell, a circle of intermediate rear shell ring is arranged on the rear outer wall of the intermediate shell, the intermediate shell inner sleeve is fixed at the center of the intermediate rear shell ring, the intermediate shell outer inner sleeve is arranged at 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 arranged at the center of the intermediate shell outer inner sleeve. The rear shell assembly includes a buckle, a rear shell, a rear shell front ring and a rear shell rear ring. The rear shell front ring is arranged on the front outer wall of the rear shell, the rear shell rear ring is arranged on the rear outer wall of the rear shell, and a plurality of buckles are arranged at intervals on the rear outer wall of the rear shell.

[0009] Furthermore, the rear shell cover comprises a lower shell cover, a lower shell ring, an inner sleeve ring and a retaining ring, the lower shell ring is integrally formed and arranged at the front end of the lower shell cover, the inner sleeve ring is arranged at the bottom of the lower shell cover, and the retaining ring is integrally formed and arranged on the inner sleeve ring. The connecting frame comprises an upper clamp sleeve, a lower clamp seat and an inner groove, the upper clamp sleeve is fixed to the upper end of the lower clamp seat by bolts, and a circle of inner groove is arranged on the inner side of the upper clamp sleeve and the lower clamp seat.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. A self-dust exhaust cabin positive pressure air filter of the present invention drives the fan wheel to rotate at high speed through the fan motor, so that the external air is sucked into the air inlet section from the first air inlet at the front end of the front cover body, enters through the second air inlet in the center of the front fan cover, and is sent out from between the rear end of the front fan cover and the rear fan cover after centrifugal compression by the fan guide vane. Under the action of the fan wheel, the airflow, dust, etc. are sent to the vicinity of the wall surface of the air duct, and then the impurities are further pushed to the wall surface by the cyclone pre-filter. After the separation action of the inertial separation blade ring group, most of the dust is separated and discharged near the dust outlet. The air that has been preliminarily purified is passed to the air filter element, and is further filtered by the air filter element and discharged from the dust outlet, thereby providing clean air, while increasing the pressure in the cabin, preventing external dust impurities and other pollutants from entering, and further ensuring the air quality in the cabin.

[0011] 2. A self-dust exhaust cabin positive pressure air filter of the present invention is provided with an intermediate flow guide at the rear section inside the intermediate shell, so that when the air flows through the intermediate flow guide after passing through the guide of the pre-filter, the air vortex area can be eliminated, so that the air coming from the pre-filter end can enter the inertial separation blade ring group more smoothly, so as to reduce the resistance and improve the inertial separation effect of impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 2 It is a right side view of the present invention; Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 4 It is a front view of the present invention; Figure 5 yes Figure 4 AA section view; Figure 6 It is a schematic diagram of the structure of the present invention after removing the air intake cover, the air intake section, the intermediate shell and the connecting frame; Figure 7 It is a structural schematic diagram of the air inlet section in the present invention; Figure 8 It is a schematic structural diagram of the rear shell cover in the present invention; Fig. 9 It is a structural schematic diagram of the connecting frame in the present invention; Fig.10 It is a structural schematic diagram of the connecting frame in the present invention; Fig.11 is a separation diagram of the fan wheel of the present invention; Fig.12 It is a schematic diagram of the connection structure between the intermediate shell and the intermediate body guide in the present invention; Fig.13 It is a schematic diagram of the structure of the intermediate shell in the present invention; Fig.14 It is a structural schematic diagram of the rear housing assembly in the present invention; Fig.15 It is a schematic diagram of the air circulation inside the present invention when it is working.

[0013] Figure: air intake cover-1; air intake section-2; intermediate shell-3; rear shell assembly-4; rear shell cover-5; connecting frame-6; fan wheel-7; pre-filter-8; fan motor-9; intermediate guide body-10; inertial separation blade ring group-11; air filter element-12; rear cover body-21; front cover body-22; outer cover ring-23; air intake grille-24; threaded column seat-25; outlet pipe-31; intermediate shell-32; 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 body-42; rear shell front ring-43; rear shell rear ring-44; lower shell cover-51; lower shell ring-52; inner sleeve ring-53; baffle ring-54; dust discharge port-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 DESCRIPTION

[0014] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0015] The purpose of the present invention is to provide a self-dust exhausting cabin positive pressure air filter in view of the defects of the prior art. Example

[0016] This embodiment provides a self-dust exhaust cabin positive pressure air filter, referring to Figure 1 As shown, it includes an air intake hood 1, an air intake section 2, an intermediate shell 3, a rear shell assembly 4, a rear shell cover 5 and a connecting frame 6. The air intake hood 1 is installed in front of the air intake section 2 by screws, and the rear end of the air intake section 2 and the front end of the intermediate shell 3, as well as the rear end of the intermediate shell 3 and the front end of the rear shell assembly 4 are detachably sealed and connected by two connecting frames 6 respectively, and the rear shell cover 5 is detachably installed at the rear end of the rear shell assembly 4.

[0017] Reference Figure 2-Figure 6 As shown, the middle shell 3, the rear shell assembly 4, and the rear shell cover 5 are all hollow cylinders in the center. The air inlet section 2 and the middle shell 3 are provided with a pre-filter 8. A front guide vane mounting hole is formed in the center of the pre-filter 8. A fan motor 9 is fixed in the front guide vane mounting hole. A fan wheel 7 is fixed at the driving end of the fan motor 9. The fan wheel 7 is located in the front section of the air inlet section 2. An intermediate guide body 10 is provided in the rear section of the middle shell 3. An inertial separation The blade ring assembly 11 and the bottom end of the intermediate body guide 10 are connected with an air outlet pipe 31, and the air outlet pipe 31 extends to the outside of the intermediate shell 3 after passing through the intermediate shell 3. An air filter element 12 is sandwiched between the rear side of the intermediate body guide 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 walls of the intermediate shell 3, the rear shell assembly 4, and the rear shell cover 5. A dust outlet 55 is provided at the rear bottom end of the rear shell cover 5.

[0018] When the self-dust-discharging cabin positive pressure air filter is working, the fan motor 9 drives the fan wheel 7 to rotate at a high speed, so that the external air is sucked in, and after being guided by the pre-filter 8, it flows to the intermediate guide body 10. The intermediate guide body 10 will eliminate the eddy flow area at the rear of the pre-filter 8, so that the air coming from the end of the pre-filter 8 can enter the inertial separation blade ring group 11 spaced on the rear end outer wall of the intermediate guide body 10 more smoothly, reducing the resistance while improving the inertial separation effect, so that the larger particle impurities in the air are filtered by the air filter element 12 and discharged from the dust discharge port 55, and the purified clean air flows out from the inside of the filter element and is discharged through the outlet pipe 31 connected to the bottom end of the intermediate guide body 10. Thereby, the poor air environment of the cab, operating room, simple room, etc. of vehicles, equipment, etc. in high dust environment, and the problem that the working environment of the driver and indoor staff cannot meet the standard can be solved, and the air environment quality in the space can be improved. The self-dust-discharging cabin positive pressure air filter can be used to supply air to the cabin alone, or it can be connected to the air conditioning fresh air system in the prior art as the air intake of the cabin air conditioning fresh air system.

[0019] Reference Figure 7 As shown, the air inlet section 2 includes a rear cover body 21, a front cover body 22, an outer cover ring 23, an air inlet grille 24 and a threaded column seat 25. The rear cover body 21 is circular, and the front cover body 22 is integrally formed with the rear cover body 21. The front cover body 22 is funnel-shaped, and the outer cover ring 23 is arranged on the outside of the rear cover body 21; a first air inlet is arranged at the front center of the front cover body 22, and the air inlet grille 24 is installed in the first air inlet. Threaded column seats 25 integrally formed with the air inlet grille 24 are symmetrically arranged on both sides of the air inlet grille 24, and the air inlet cover 1 is fixed to the threaded column seat 25 by long screws, so that the air inlet cover 1 is fixed in front of the air inlet section 2.

[0020] Reference Figure 8 As shown, the rear shell cover 5 includes a lower shell cover 51, a lower shell ring 52, an inner ring 53 and a retaining ring 54. The lower shell ring 52 is integrally formed and arranged at the front end of the lower shell cover 51. The lower shell 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 shell cover 5 can be conveniently installed and disassembled at the rear end of the rear shell assembly 4. The inner ring 53 is arranged at the bottom of the lower shell cover 51, and the retaining ring 54 is integrally formed and arranged on the inner ring 53. The dust exhaust port 55 is located below the retaining ring 54.

[0021] Reference Fig. 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, and a circle of inner groove 63 is arranged inside the upper clamp sleeve 61 and the lower clamp seat 62. A sealing ring is arranged in the inner groove 63, so that the air inlet section 2 and the middle shell 3, and the middle shell 3 and the rear shell assembly 4 can be conveniently sealed and docked or disassembled.

[0022] Reference Figure 10-11 As shown, the fan wheel 7 specifically includes a front fan cover 71, a rear fan cover 72 and a fan guide vane 73. A second air inlet is provided at the front center 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 a plurality of 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 a dot, so that air enters from the second air inlet at the front center of the front fan cover 71, and is centrifugally compressed by the fan guide vanes 73 and then sent out from between the rear end of the front fan cover 71 and the rear fan cover 72. The fan wheel 7 in this embodiment is a centrifugal impeller with a blade outer diameter of 120-180 mm. The fan motor 9 can be driven by a 24V brushless motor, and its maximum speed is not less than 4500 rpm.

[0023] Reference Figure 12-13 As 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. A circle of intermediate front shell ring 33 is arranged on the front end outer wall of the intermediate shell 32, a circle of intermediate rear shell ring 34 is arranged on the rear end outer wall of the intermediate shell 32, the intermediate shell inner sleeve 35 is fixed at the center of the intermediate rear shell ring 34, the intermediate shell outer inner sleeve 36 is arranged at 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 arranged at the center of the intermediate shell outer inner sleeve 36.

[0024] Reference Fig.14 As shown, the rear shell assembly 4 includes a buckle 41, a rear shell 42, a rear shell front ring 43 and a rear shell rear ring 44. The rear shell front ring 43 is arranged on the front end outer wall of the rear shell 42, and the rear shell rear ring 44 is arranged on the rear end outer wall of the rear shell 42. A plurality of buckles 41 are also arranged at intervals on the rear outer wall of the rear shell 42.

[0025] The self-dust exhaust cabin positive pressure air filter of the present invention can be used to supply air to the cabin alone, or it can be connected to the air conditioning fresh air system in the prior art to serve as the air intake of the cabin air conditioning fresh air system. When supplying air to the cabin, the filter can be installed on the outer wall of the cabin, and a hole is opened in the cabin wall to connect with the air outlet pipe 31 of the filter; the filter is fixed to the outer wall surface of the cabin through a connecting frame 6.

[0026] Reference Fig.15 As shown, the arrow in the figure indicates the flow direction of the internal air of the filter when it is working. When working, the fan motor 9 drives the fan wheel 7 to rotate at a high speed, so that the external air is sucked 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, and is centrifugally compressed by the fan guide vane 73 and sent out from between the rear end of the front fan cover 71 and the rear fan cover 72.

[0027] The air sent out flows through the intermediate guide body 10 after being guided by the pre-filter 8. The intermediate guide body 10 will eliminate the air vortex area at the rear of the pre-filter 8, so that the air coming from the end of the pre-filter 8 can enter the inertial separation blade ring group 11 more smoothly to reduce resistance and improve the inertial separation effect. In this process, under the action of the fan wheel 7, the airflow, dust, etc. are sent to the vicinity of the wall surface of the air duct, and then the impurities are further pushed to the wall surface by the cyclone pre-filter 8. After the separation action of the inertial separation blade ring group 11, most of the dust is separated and discharged near the dust outlet 55. The air after preliminary purification is passed to the air filter element 12 to further filter the impurities. After filtration, it enters the interior of the air filter element 12. It is discharged from the dust outlet 55. The purified clean air flows out from the interior of the filter element and is discharged through the outlet pipe 31 connected to the bottom end of the intermediate guide body 10, so as to provide clean air for the cabin, increase the pressure in the cabin, prevent external dust impurities and other pollutants from entering, and further ensure the air quality in the cabin.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A self-dust exhaust cabin positive pressure air filter, characterized in that: It comprises an air intake hood (1), an air intake section (2), an intermediate shell (3), a rear shell assembly (4), a rear shell cover (5) and a connecting frame (6), The air intake hood (1) is installed in front of the air intake section (2) by means of screws; the rear end of the air intake section (2) and the front end of the intermediate shell (3), and the rear end of the intermediate shell (3) and the front end of the rear shell assembly (4) are respectively detachably sealed and connected via two connecting frames (6); the rear shell cover (5) is detachably installed at the rear end of the rear shell assembly (4); The intermediate shell (3), the rear shell assembly (4), and the rear shell cover (5) are all cylindrical in shape with a central hollow. A pre-filter (8) is arranged inside the air inlet section (2) and the intermediate shell (3). A front guide vane mounting hole is formed in the center of the pre-filter (8). A fan motor (9) is fixed in the front guide vane mounting hole. A fan wheel (7) is fixed to the driving end of the fan motor (9). The fan wheel (7) is located in the front section of the air inlet section (2). An intermediate guide body (10) is arranged in the rear section of the intermediate shell (3). An inertial separation blade ring group (11) is arranged at intervals on the rear end outer wall of the intermediate guide body (10). The bottom end of the intermediate guide body (10) is connected to an air outlet pipe (31). The air outlet pipe (31) passes through the intermediate shell (3) and extends to the outside thereof. An air filter element (12) is sandwiched between the rear side of the intermediate flow guide (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 passage is formed between the outer side of the air filter element (12) and the inner walls 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 rear bottom end of the rear shell cover (5); The air inlet section (2) comprises a rear cover body (21), a front cover body (22), an outer cover ring (23), an air inlet grille (24) and a threaded column seat (25); the rear cover body (21) is circular, the front cover body (22) and the rear cover body (21) are integrally formed, the front cover body (22) is funnel-shaped, and the outer cover ring (23) is arranged on the outside of the rear cover body (21); a first air inlet is arranged at the center of the front end of the front cover body (22), the air inlet grille (24) is installed in the first air inlet, and threaded column seats (25) integrally formed with the air inlet grille (24) are symmetrically arranged on both sides of the air inlet grille (24).

2. The self-dust exhaust cabin positive pressure air filter according to claim 1, characterized in that: The fan wheel (7) comprises a front fan cover (71), a rear fan cover (72) and a fan guide vane (73); a second air inlet is arranged at the center of the front end of the front fan cover (71); a rear end of the front fan cover (71) and a front end of the rear fan cover (72) are connected and fixed via a plurality of fan guide vanes (73); the front fan cover (71) is trumpet-shaped, the rear fan cover (72) is circular, and the fan guide vanes (73) are evenly spaced and distributed with the axial center of the rear fan cover (72) as a dot.

3. The self-dust exhausting cabin positive pressure air filter according to claim 2, characterized in that: The intermediate shell (3) comprises 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); a circle of the intermediate front shell ring (33) is arranged on the front end outer wall of the intermediate shell (32); a circle of the intermediate rear shell ring (34) is arranged on the rear end outer wall of the intermediate shell (32); the intermediate shell inner sleeve (35) is fixed at the center of the intermediate rear shell ring (34); the intermediate shell outer inner sleeve (36) is arranged at 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 arranged at the center of the intermediate shell outer inner sleeve (36); The rear shell assembly (4) comprises a buckle (41), a rear shell (42), a rear shell front ring (43) and a rear shell rear ring (44); the rear shell front ring (43) is arranged on the front end outer wall of the rear shell (42); the rear shell rear ring (44) is arranged on the rear end outer wall of the rear shell (42); and a plurality of buckles (41) are arranged at intervals on the rear outer wall of the rear shell (42).

4. The self-dust exhaust cabin positive pressure air filter according to claim 3, characterized in that: The rear shell cover (5) comprises a lower shell cover (51), a lower shell ring (52), an inner sleeve ring (53) and a retaining ring (54); the lower shell ring (52) is integrally formed and arranged at the front end of the lower shell cover (51); the inner sleeve ring (53) is arranged at the bottom of the lower shell cover (51); and the retaining ring (54) is integrally formed and arranged on the inner sleeve ring (53).

5. The self-dust exhaust cabin positive pressure air filter according to claim 4, characterized in that: The connecting frame (6) comprises 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 means of bolts; a circle of inner groove (63) is provided on the inner sides of the upper clamp sleeve (61) and the lower clamp seat (62).

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