Air filter with self-sealing device

Abstract

The application relates to the field of air filters, in particular to an air filter with a self-sealing device. The air filter comprises a ventilation cylinder, a blocking plate, a filter element assembly and a linkage mechanism; the ventilation cylinder is provided with an air inlet and an air outlet at the horizontal direction ends, a through-plug opening penetrating the top of the ventilation cylinder along the vertical direction and a slide penetrating the whole ventilation cylinder, and the through-plug opening is located between the air inlet and the slide; the blocking plate is vertically slidably arranged at the through-plug opening; the filter element assembly is slidably arranged at the slide and comprises a filter element; when the filter element is in a filtering state, the filter element is blocked in the middle of the slide, and the bottom end of the blocking plate is flush with the bottom end of the through-plug opening; when the filter element is in a replacement state, the filter element moves upwards and is exposed from the top of the slide, and the blocking plate is blocked in the inner side of the ventilation cylinder; the linkage mechanism is in transmission connection with the filter element assembly and the blocking plate. The application does not interfere with the air circulation in normal use to ensure the utilization rate of the filter element, and can automatically close the air circulation in the ventilation cylinder when the filter element is replaced.

Description

Technical Field

[0001] This invention relates to the field of air filters, and in particular to an air filter with a self-sealing device. Background Technology

[0002] Air filters are generally used in environments such as workshops, factories, and laboratories, or for dust protection in electronic, mechanical, and communication equipment. When replacing the filter element, the air filter needs to be sealed to reduce pollution to the external environment. The seal should be removed after the filter element replacement is complete.

[0003] Chinese Patent Publication No. CN218306845U discloses an air filter with a self-sealing device, comprising an air filter body, a threaded rotating rod internally connected to the air filter body, a turntable fixed on the threaded rotating rod, a connecting rod rotatably connected to one end of the turntable, and a hinge seat hinged to the other end of the connecting rod. A sliding plate is fixed to the outside of the hinge seat and slides against the inner wall of the air filter body. Rotating the threaded rotating rods on both sides causes the air filter body to drive the turntable to rotate, causing the connecting rod to move to the right while rotating along the hinge seat until the insert is inserted into the opening, sealing the air filter. Unscrewing the bolts allows the filter frame on the connecting plate to be pulled out of the air filter for easy cleaning. After cleaning, the filter frame is reinserted into the air filter and fixed in place by bolts.

[0004] However, the above technical solution has the following shortcomings:

[0005] Structures such as inserts and fixing plates used to seal the air filter are located inside the air filter body. Under normal use conditions where the air filter is not sealed, they will affect airflow, and air can only flow from the inlet to the filter frame. Only the area on the filter frame that is aligned with the inlet can be effectively filtered, while the rest of the area is not effectively utilized, resulting in low utilization of the filter frame. Summary of the Invention

[0006] The purpose of this invention is to address the problems existing in the background art by proposing an air filter with a self-sealing device that does not interfere with airflow during normal use to ensure filter element utilization and can automatically seal the airflow inside the ventilation duct when the filter element is replaced.

[0007] The technical solution of the present invention provides an air filter with a self-sealing device, comprising a ventilation cylinder, a sealing plate, a filter element assembly, and a linkage mechanism. The ventilation cylinder has an air inlet and an air outlet at its horizontal ends, and a through-hole extending vertically through the top of the ventilation cylinder, and a slide rail extending through the entire ventilation cylinder. The through-hole is located between the air inlet and the slide rail. The sealing plate is vertically slidably disposed at the through-hole. The filter element assembly, including a filter element, is slidably disposed at the slide rail. When the filter element is in the filtering state, the filter element is blocked in the middle of the slide rail, and the bottom end of the sealing plate is flush with the bottom end of the through-hole. When the filter element is in the replacement state, the filter element moves upward and protrudes from the top of the slide rail, and the sealing plate seals the inside of the ventilation cylinder. The linkage mechanism is drivenly connected to the filter element assembly and the sealing plate.

[0008] Preferably, two limiting plates are symmetrically arranged at the top of the ventilation duct, and a sliding channel for the sealing plate to slide is formed between the two limiting plates.

[0009] Preferably, the filter element includes a filter element frame and a core installed inside the filter element frame. The filter element frame has an outwardly extending positioning platform on one side of its horizontal direction. The filter element assembly also includes a sliding frame that is vertically slidably disposed at the slide rail and a top plate that is horizontally disposed at the top of the sliding frame. The sliding frame has a positioning groove on one side of its horizontal direction for the positioning platform to engage. The projected size of the top plate is larger than the opening size at the top of the slide rail.

[0010] Preferably, the ventilation duct protrudes outward at both ends in the width direction at the slide, and when the core is located in the filtration position inside the ventilation duct, the core and the ventilation duct are centered and aligned, and the outer contour edge of the core is flush with the inner wall of the middle part of the ventilation duct.

[0011] Preferably, a fixed platform is provided at the top of the ventilation duct, and a second slide rod is horizontally slidably provided on the fixed platform. A push-pull plate and a locking platform are respectively connected to the two ends of the second slide rod. A second spring is sleeved on the outer periphery of the second slide rod, with its two ends respectively connected to the fixed platform and the locking platform. The outer end of the locking platform has a downward inclined surface. The bottom of the sliding frame has a locking groove for the locking platform to be inserted. A limiting rod that can be rotatably provided on the top of the locking platform can block the top plate.

[0012] Preferably, a handle is provided at the top of the top plate.

[0013] Preferably, the ventilation duct is equipped with a lifting mechanism for driving the top plate to rise and fall.

[0014] Preferably, the linkage mechanism includes a connecting plate disposed on the top of the sealing plate and two sets of linkage components arranged symmetrically. The linkage components include a belt, two sets of pulley assemblies disposed on the top and bottom of the ventilation duct respectively, a first connecting frame connected to the top plate and one side of the belt at both ends respectively, and a second connecting frame connected to the connecting plate and the other side of the belt at both ends respectively. The pulley assembly includes a bracket disposed on the ventilation duct and a pulley rotatably disposed on the bracket. The belt is fitted onto the two pulleys in the same set of linkage components.

[0015] Preferably, a guide plate is provided at the bottom of the second connecting frame, and a first slide rod is horizontally slidably arranged on the guide plate. The two ends of the first slide rod are respectively connected to an end plate and a vibrating strip. A first spring is sleeved on the outer periphery of the first slide rod, with its two ends respectively connected to the guide plate and the vibrating strip. The vibrating strip is vertically distributed, and multiple "V"-shaped grooves are arranged side by side along the vertical direction on the vibrating strip. A third connecting frame is connected to the bottom of the vibrating strip. A dust collection seat is provided at the bottom of the ventilation duct, and the dust collection seat is located below the slide rail and connected to the third connecting frame. Excitation tables are provided on both sides of the ventilation duct, and the excitation tables have "V"-shaped surfaces that are adapted to the "V"-shaped grooves on the vibrating strip.

[0016] Preferably, the top two sides of the dust collection seat have dust collection surfaces that slope towards the center, and the center has a vertically connected dust collection channel.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] This invention does not interfere with the airflow inside the ventilation duct during normal use, allowing air to circulate to all areas of the core, ensuring the utilization rate of the filter element. Furthermore, when replacing the filter element, the linkage mechanism can automatically seal the sealing plate inside the ventilation duct, making the filter element replacement process more convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the filter element in the filtration state in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A partial structural sectional view;

[0021] Figure 3 This is a schematic diagram of the structure when replacing the filter element according to an embodiment of the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle;

[0023] Figure 5 for Figure 3 Enlarged view of the structure at point B;

[0024] Figure 6 Exploded cross-sectional view of the ventilation duct and dust collection seat;

[0025] Figure 7 This is an exploded view of the structure of the top plate, sliding frame, handle, filter element frame, and core.

[0026] Reference numerals: 1. Ventilation duct; 101. Air inlet; 102. Air outlet; 103. Slide rail; 104. Insertion port; 2. Top plate; 3. Sliding frame; 301. Positioning groove; 302. Slot; 4. Handle; 5. Filter frame; 501. Positioning platform; 6. Core; 7. Dust collection seat; 701. Dust collection surface; 702. Dust collection channel; 8. Pulley; 9. Bracket; 10. Belt; 11. First connecting frame; 12. Second connecting frame; 13. Connecting plate; 14. Sealing plate; 15. Limiting plate; 16. Vibration table; 17. Guide plate; 18. First slide rod; 19. End plate; 20. Vibration bar; 21. First spring; 22. Third connecting frame; 23. Fixed platform; 24. Second slide rod; 25. Push-pull plate; 26. Slot; 27. Second spring; 28. Limiting rod. Detailed Implementation

[0027] Example 1

[0028] like Figures 1-7 As shown in the figure, the air filter with a self-sealing device proposed in this embodiment includes a ventilation cylinder 1, a sealing plate 14, a filter element assembly and a linkage mechanism.

[0029] like Figure 1 and Figure 6 As shown, the ventilation duct 1 has an air inlet 101 and an air outlet 102 at its horizontal ends, and an insertion port 104 that extends vertically through the top of the ventilation duct 1 and a slide 103 that extends through the entire ventilation duct 1. The insertion port 104 is located between the air inlet 101 and the slide 103. Air entering the ventilation duct 1 from the air inlet 101 first passes through the area below the insertion port 104, then through the area of ​​the slide 103, and finally exits from the air outlet 102.

[0030] The sealing plate 14 is vertically slidably installed at the insertion port 104. It can block the airflow inside the ventilation duct 1 by sliding down to the limit position and release the blockage of the ventilation duct 1 when sliding up to the limit position.

[0031] The filter element assembly is slidably disposed at the slide rail 103, and includes a filter element, a sliding frame 3 vertically slidably disposed at the slide rail 103, and a top plate 2 horizontally disposed at the top of the sliding frame 3. The filter element includes a filter element frame 5 and a core 6 installed inside the filter element frame 5. When replacing the filter element, the assembled filter element frame 5 and core 6 are replaced as a whole.

[0032] When the filter element is in the filtering state, it is positioned in the middle of the slide 103, and the bottom end of the sealing plate 14 is flush with the bottom end of the insertion port 104. Without external force, the weight of the filter element assembly is sufficient to maintain it in the filtering state, with the filter element located inside the ventilation duct 1 for air filtration. When the filter element is in the replacement state, it moves upward and protrudes from the top of the slide 103, and the sealing plate 14 seals the inside of the ventilation duct 1.

[0033] Two limiting plates 15 are symmetrically arranged at the top of the ventilation duct 1, forming a sliding channel between the two limiting plates 15 for the sealing plate 14 to slide. This further guides the sliding process of the sealing plate 14, allowing it to slide accurately in the vertical direction. When the filter element is in the filtration state, the sealing plate 14 is in the unsealed position of the ventilation duct 1. The protection of the limiting plates 15 on both sides also prevents dust accumulation on the sealing plate 14, improving its cleanliness.

[0034] The filter element frame 5 has an outwardly extending positioning platform 501 on one horizontal surface, and the positioning platform 501 has a through hole. The sliding frame 3 has a positioning groove 301 on one horizontal surface for the positioning platform 501 to engage, and the bottom of the positioning groove 301 has a threaded hole. When installing the filter element frame 5, the positioning platform 501 is engaged into the positioning groove 301, and a bolt is passed through the through hole and threaded into the threaded hole. The head of the bolt is inside the positioning groove 301 and will not protrude from the sliding frame 3. After installation, the surface of the core 6 facing the air direction is flush with one side surface of the filter element frame 5 and one side surface of the sliding frame 3. The projected size of the top plate 2 is larger than the top opening size of the slide rail 103. When the sliding frame 3 slides down to its limit position, the top plate 2 blocks the top opening of the slide rail 103.

[0035] When the ventilation duct 1 protrudes outward at both ends in the width direction at the slide 103, and the core 6 is located in the filter position inside the ventilation duct 1, the core 6 is centered and aligned with the ventilation duct 1, and the outer contour edge of the core 6 is flush with the inner wall of the middle part of the ventilation duct 1. That is, the core 6 is not blocked by the ventilation duct 1, and it will not be unable to effectively filter the air due to the small size of the core 6. The size of the core 6 is just right to the air flow range. When the air flows to the core 6, it can flow to all areas of the core 6, ensuring the filtration effect and utilization rate in a balanced manner.

[0036] like Figures 2-4 As shown, the linkage mechanism is connected to the filter element assembly and the sealing plate 14, so that the filter element assembly and the sealing plate 14 move in opposite directions at the same time. When the filter element assembly moves upward to be replaced, the sealing plate 14 moves downward to seal the inside of the ventilation cylinder 1. After the filter element in the filter element assembly is replaced, when the filter element assembly moves downward, the sealing plate 14 moves upward to release the seal.

[0037] In normal use, this embodiment will not interfere with the air circulation inside the ventilation duct 1. The air can circulate to all areas on the core 6, ensuring the utilization rate of the filter element. When replacing the filter element, the sealing plate 14 can be automatically sealed inside the ventilation duct 1 through the linkage mechanism. Two processes can be performed in one operation, making the filter element replacement process more convenient.

[0038] Example 2

[0039] like Figures 1-7As shown in this embodiment, an air filter with a self-sealing device is proposed. Compared with Embodiment 1, in this embodiment, a fixed platform 23 is provided at the top of the ventilation cylinder 1. A second sliding rod 24 is horizontally slidably arranged on the fixed platform 23. Push-pull plates 25 and locking platforms 26 are respectively connected to the two ends of the second sliding rod 24. A second spring 27 is sleeved on the outer periphery of the second sliding rod 24, with its two ends connected to the fixed platform 23 and the locking platform 26 respectively. The outer end of the locking platform 26 has a downward inclined surface. The bottom of the sliding frame 3 has a locking groove 302 for the locking platform 26 to be inserted. A limiting rod 28 is rotatably provided on the top of the locking platform 26 to block the top plate 2. When the filter element is in normal use, the top plate 2 rests on the top of the ventilation cylinder 1. By rotating the limiting rod 28, the limiting rod 28 can be blocked above the top plate 2, keeping the position of the top plate 2 stable, thereby keeping the position of the core 6 stable. The core 6 performs effective air filtration inside the ventilation cylinder 1.

[0040] When replacing the filter element, rotate the limiting rod 28 away from the top plate 2, moving the top plate 2 upwards. The top plate 2 then moves the sliding frame 3 and the filter element upwards. The side of the sliding frame 3 slides on the outer end of the mounting plate 26, and the second spring 27 is compressed. When the sliding frame 3 moves to the height where the mounting groove 302 faces the mounting plate 26, the mounting plate 26 is pushed forward by the second spring 27, and the outer end of the mounting plate 26 is engaged in the mounting groove 302. At this time, the filter element is fully exposed from the slide rail 103, and the sliding frame 3 and the filter element are in stable positions, allowing the user to easily disassemble and replace the filter element. After replacing the filter element, pull the push-pull plate 25 outwards to remove the mounting plate 26 from the mounting groove 302, lower the top plate 2, and then rotate the limiting rod 28 again to block the top plate 2.

[0041] like Figures 1-3 As shown, a handle 4 is provided on the top of the top plate 2, allowing users to easily raise and lower the top plate 2 by gripping the handle 4. Furthermore, the ventilation duct 1 is equipped with a lifting mechanism for driving the top plate 2 to rise and fall. The lifting mechanism can adopt a structure that can achieve linear drive, such as an electric push rod or a cylinder. The action of the lifting mechanism is controlled by an external control switch to raise or lower the top plate 2, making it more labor-saving.

[0042] This embodiment can assist in limiting the position of the filter element assembly, making it easier to replace the filter element, reducing the workload when replacing the filter element, and improving the replacement efficiency.

[0043] Example 3

[0044] like Figures 1-7As shown, this embodiment proposes an air filter with a self-sealing device. Compared to Embodiment 1, in this embodiment, the linkage mechanism includes a connecting plate 13 disposed on the top of the sealing plate 14 and two sets of linkage components symmetrically arranged. The linkage components include a belt 10, two sets of pulley assemblies respectively disposed on the top and bottom of the ventilation duct 1, a first connecting frame 11 whose two ends are respectively connected to the top plate 2 and one side of the belt 10, and a second connecting frame 12 whose two ends are respectively connected to the connecting plate 13 and the other side of the belt 10. The pulley assembly includes a bracket 9 disposed on the ventilation duct 1 and pulleys 8 rotatably disposed on the bracket 9. The belt 10 is fitted onto the two pulleys 8 in the same set of linkage components. When the top plate 2 moves upward, the first connecting frame 11 drives the belt 10 to rotate, which in turn drives the two pulleys 8 to rotate. On the other side, the belt 10 drives the second connecting frame 12 to move downward. The second connecting frame 12 drives the sealing plate 14 to move downward through the connecting plate 13. When the sealing plate 14 reaches the sealing position, the filter element is completely exposed above the slide rail 103, but the sliding frame 3 does not detach from the slide rail 103. The sealing plate 14 limits the movement range of the sliding frame 3, preventing it from slipping off. Similarly, when the filter element is replaced and the sliding frame 3 is moved downward, the top plate 2 rests on the top of the ventilation duct 1, limiting the upward movement range of the sealing plate 14 and preventing it from detaching from the insertion port 104. Instead, the bottom of the sealing plate 14 is flush with the inner wall of the ventilation duct 1, ensuring smooth airflow.

[0045] For pulley 8 and belt 10, synchronous pulleys and synchronous belts can be selected accordingly to improve the smoothness of power transmission during linkage and prevent slippage of pulley 8 and belt 10.

[0046] The bottom of the second connecting frame 12 is provided with a guide plate 17. A first sliding rod 18 is horizontally slidably mounted on the guide plate 17. The two ends of the first sliding rod 18 are respectively connected to an end plate 19 and a vibrating strip 20. A first spring 21 is sleeved on the outer periphery of the first sliding rod 18, with its two ends connected to the guide plate 17 and the vibrating strip 20 respectively. The vibrating strip 20 is vertically distributed, and the bottom end of the vibrating strip 20 is connected to a third connecting frame 22. The bottom of the ventilation duct 1 has a dust collection seat 7, which is located below the slide rail 103 and is connected to the third connecting frame 22. When the top plate 2 moves upward, the sealing plate 14 moves downward, and the second connecting frame 12 drives the guide plate 17 to move downward. The guide plate 17 drives the first sliding rod 18, the vibrating strip 20, the third connecting frame 22, and the dust collection seat 7 to move downward, making it convenient for users to clean the dust remaining on the dust collection seat 7.

[0047] like Figure 3 and Figure 4As shown, the vibrating bar 20 has multiple "V"-shaped grooves arranged side by side along the vertical direction. Excitation platforms 16 are provided on both sides of the ventilation duct 1, and each excitation platform 16 has a "V"-shaped surface that matches the "V"-shaped grooves on the vibrating bar 20. When the vibrating bar 20 first begins to move downwards, it moves vertically, and the dust collection seat 7 moves vertically, moving downwards from the bottom of the ventilation duct 1. As the vibrating bar 20 continues to move downwards, the multiple "V"-shaped grooves on the vibrating bar 20 will sequentially contact the "V"-shaped surface of the excitation platform 16. When the vibrating bar 20 is pushed by the excitation platform 16, it moves laterally and compresses the first spring 21. Then, the first spring 21 pushes the vibrating bar 20 to move in the opposite direction, causing the vibrating bar 20 to reciprocate horizontally while moving vertically. The dust collection seat 7 also reciprocates while moving vertically, shaking off the dust accumulated on it. Users need to place a trash can below to collect the dust.

[0048] The dust collection seat 7 has dust collection surfaces 701 sloping towards the center on both sides of its top, and a vertically connected dust collection channel 702 in the center. The two dust collection surfaces 701 are located on the front and rear sides of the filter element, respectively. Dust may fall when the filter element is in the filtering state or when the user replaces the filter element, and the dust falls downwards onto the dust collection surfaces 701. Therefore, the dust collection seat 7 is lowered and vibrated to shake off the dust. Most of the dust on the dust collection seat 7 falls through the dust collection channel 702. After the filter element is replaced, the sealing plate 14 moves upward, the dust collection seat 7 moves upward and connects with the slide rail 103 at the bottom of the ventilation duct 1, and the sliding bracket 3 is inserted into the dust collection channel 702, resulting in a neat overall structure.

[0049] In this embodiment, a linkage mechanism is used to link the filter element assembly and the sealing plate 14, achieving synchronous movement. In addition, a structure that can remove dust by vibration is added to shake off the dust on the dust collection seat 7, improving the cleanliness of the entire air filter after filter element replacement.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An air filter with a self-sealing device, characterized in that, include: The ventilation duct (1) has an air inlet (101) and an air outlet (102) at its two horizontal ends, and has an insertion port (104) that passes through the top of the ventilation duct (1) in the vertical direction and a slide (103) that passes through the entire ventilation duct (1). The insertion port (104) is located between the air inlet (101) and the slide (103). A blocking plate (14) is vertically slidably installed at the insertion port (104); The filter element assembly is slidably disposed in the slide (103) and includes the filter element; when the filter element is in the filtering state, the filter element is blocked in the middle of the slide (103), and the bottom end of the sealing plate (14) is flush with the bottom end of the insertion port (104); when the filter element is in the replacement state, the filter element moves up and protrudes from the top of the slide (103), and the sealing plate (14) seals the inside of the ventilation tube (1); The linkage mechanism is connected to the filter element assembly and the sealing plate (14) in a transmission manner; The filter element includes a filter element frame (5) and a core (6) installed inside the filter element frame (5). The filter element frame (5) has an extended positioning platform (501) on one side of its horizontal direction. The filter element assembly also includes a sliding frame (3) vertically slidably disposed at the slide rail (103) and a top plate (2) horizontally disposed at the top of the sliding frame (3). The sliding frame (3) has a positioning groove (301) on one side of its horizontal direction for the positioning platform (501) to be inserted into. The projected size of the top plate (2) is larger than the opening size at the top of the slide rail (103). The linkage mechanism includes a connecting plate (13) set on the top of the sealing plate (14) and two sets of linkage components arranged symmetrically. The linkage components include a belt (10), two sets of pulley assemblies set on the top and bottom of the ventilation duct (1) respectively, a first connecting frame (11) connected to the top plate (2) and one side of the belt (10) at both ends respectively, and a second connecting frame (12) connected to the connecting plate (13) and the other side of the belt (10) at both ends respectively. The pulley assembly includes a bracket (9) set on the ventilation duct (1) and a pulley (8) rotatably set on the bracket (9). The belt (10) is fitted on the two pulleys (8) in the same set of linkage components. The bottom of the second connecting frame (12) is provided with a guide plate (17), and a first slide rod (18) is horizontally slidably provided on the guide plate (17). The two ends of the first slide rod (18) are respectively connected to an end plate (19) and a vibrating strip (20). The outer periphery of the first slide rod (18) is fitted with a first spring (21) whose two ends are respectively connected to the guide plate (17) and the vibrating strip (20). The vibrating strip (20) is vertically distributed, and multiple "V" shaped grooves are arranged side by side along the vertical direction on the vibrating strip (20). The bottom end of the vibrating strip (20) is connected to a third connecting frame (22). The bottom of the ventilation duct (1) is provided with a dust collection seat (7), which is located below the slide (103) and is connected to the third connecting frame (22). Both sides of the ventilation duct (1) are provided with excitation tables (16), which have "V" shaped surfaces that are adapted to the "V" shaped grooves on the vibrating strip (20). Without external force, the weight of the filter element assembly is sufficient to maintain the filter element assembly in a filtering state.

2. An air filter with a self-sealing device according to claim 1, characterized in that, Two limiting plates (15) are symmetrically arranged at the top of the ventilation duct (1), and a sliding channel for the sealing plate (14) to slide is formed between the two limiting plates (15).

3. An air filter with a self-sealing device according to claim 1, characterized in that, The ventilation duct (1) protrudes outward at both ends in the width direction at the slide (103). When the core (6) is located in the filter position inside the ventilation duct (1), the core (6) is centered and aligned with the ventilation duct (1), and the outer contour edge of the core (6) is flush with the inner wall of the middle part of the ventilation duct (1).

4. An air filter with a self-sealing device according to claim 1, characterized in that, A fixed platform (23) is provided at the top of the ventilation duct (1). A second slide rod (24) is horizontally slidably provided on the fixed platform (23). A push-pull plate (25) and a locking platform (26) are respectively connected to the two ends of the second slide rod (24). A second spring (27) is sleeved on the outer periphery of the second slide rod (24) and its two ends are respectively connected to the fixed platform (23) and the locking platform (26). The outer end of the locking platform (26) has a downward inclined surface. The bottom of the sliding frame (3) has a slot (302) for the locking platform (26) to be inserted. A limiting rod (28) that can be blocked above the top plate (2) is rotatably provided on the top of the locking platform (2).

5. An air filter with a self-sealing device according to claim 4, characterized in that, The top plate (2) is equipped with a handle (4).

6. An air filter with a self-sealing device according to claim 5, characterized in that, The ventilation duct (1) is equipped with a lifting mechanism for driving the top plate (2) to rise and fall.

7. An air filter with a self-sealing device according to claim 1, characterized in that, The dust collection seat (7) has dust collection surfaces (701) that slope towards the center on both sides of the top, and a dust collection channel (702) that runs vertically through the center.

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