Building ventilation equipment and ventilation method thereof

Abstract

The invention discloses building ventilation equipment and a ventilation method thereof, and particularly relates to the technical field of building ventilation, the building ventilation equipment comprises a ventilation box body, a first partition plate is fixedly arranged in the ventilation box body, the first partition plate divides the interior of the ventilation box body into an air inlet cavity and an air outlet cavity, and a movable frame is arranged in each of the air inlet cavity and the air outlet cavity; and two threaded rods. The positions of the two movable frames are adjusted by rotating the two threaded rods, and then the first filter screen plate and the second filter screen plate can be exchanged back and forth in the air inlet cavity and the air outlet cavity at regular time, so that the first filter screen plate and the second filter screen plate can be subjected to back flushing cleaning; according to the ventilation device, the situation that dust is accumulated on the first filter screen plate and the second filter screen plate is effectively avoided, so that the ventilation device can work normally for a long time, the situation that the dust is accumulated on the first filter screen plate and the second filter screen plate to breed bacteria is also avoided, and the ventilation quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of building ventilation, and in particular to building ventilation equipment and a ventilation method thereof. Background Art

[0002] Ventilation equipment is widely used in homes and public places. Ventilation equipment can discharge the turbid air inside the building through mechanical air supply, and introduce fresh air from outside the building. The main purpose of ventilation is to remove the dirty air inside the building to ensure the air quality inside the building. Ventilation is widely used in building decoration, warehouse assembly line production and greenhouses for fruit cultivation.

[0003] At present, when building ventilation equipment is actually used, dust will accumulate on the internal filter after long-term use. The dust will clog the filter, which will affect the normal ventilation of the ventilation equipment. The dust accumulated on the filter will breed bacteria, which will affect the quality of ventilation. Summary of the invention

[0004] The object of the present invention is to provide a building ventilation device and a ventilation method thereof to solve the above-mentioned deficiencies in the technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a building ventilation device and a ventilation method thereof, comprising:

[0006] A ventilation box body, wherein a first partition is fixedly provided inside the ventilation box body, the first partition divides the interior of the ventilation box body into an air inlet cavity and an air outlet cavity, a movable frame is provided inside the air inlet cavity and the air outlet cavity, a top plate is provided on the top of the movable frame, and limit slots are provided at the inner ends of the movable frame and the top plate, and a first filter screen plate and a second filter screen plate are provided inside the two limit slots respectively, an air inlet fan connected to the interior of the air inlet cavity is fixedly provided at the front end of the ventilation box body, and an air outlet fan connected to the interior of the air outlet cavity is fixedly provided at the rear end of the ventilation box body;

[0007] Two threaded rods, both ends of the two threaded rods are rotatably connected to the inner side walls of the ventilation box through bearings, a threaded groove is opened at the bottom of the movable frame, one end of the threaded rod passes through the threaded groove and is threadedly connected to the threaded groove, a motor is fixedly provided on one side of the ventilation box, and the output shaft of the motor is fixedly connected to one end of one of the threaded rods.

[0008] Preferably, a synchronous wheel is fixedly provided at one end of the threaded rod, two synchronous wheels are arranged on one side of the ventilation box body, and the two synchronous wheels are connected by a synchronous belt.

[0009] Preferably, the air outlet end of the air intake fan is fixedly connected to the first air outlet duct, the rear end of the ventilation box is fixedly provided with the first air inlet duct connected to the interior of the air intake cavity, the air outlet end of the air outlet fan is fixedly provided with the second air outlet duct, and the front end of the ventilation box is fixedly provided with the second air inlet duct connected to the interior of the air outlet cavity.

[0010] Preferably, a box cover is provided on the top of the ventilation box body, two installation grooves are provided on the inner wall of the ventilation box body and the bottom of the box cover, rubber gaskets are fixed on the inner ends of the installation grooves, and the two movable frames and the top plate are respectively arranged on the inner ends of the two rubber gaskets.

[0011] Preferably, a third filter screen is fixedly provided at the air inlet end of the air inlet fan and the air inlet end of the air outlet fan.

[0012] Preferably, two first plug-in blocks are fixedly provided at the bottom end of the top plate, two first plug-in slots are provided at the top end of the movable frame, and the first plug-in blocks are arranged inside the first plug-in slots.

[0013] Preferably, a second plug-in block is fixedly provided on the front and rear sides of the bottom end of the ventilation box body, a second plug-in slot is opened on the front and rear sides of the top end of the ventilation box body, and the second plug-in block is arranged inside the second plug-in slot.

[0014] Preferably, the top of the front and rear ends of the ventilation box are provided with limit rods, and the second plug-in block is provided with limit holes. One end of the two limit rods respectively passes through the top of the front and rear ends of the ventilation box and extends into the two limit holes. The other end of the limit rod is fixedly provided with a pull block, and the outer end of the limit rod is sleeved with a spring, and the two ends of the spring are respectively fixedly connected to the inner side of the pull block and the ventilation box.

[0015] Preferably, a collecting frame is fixedly provided at the bottom end of the ventilation box body, and a second partition is fixedly provided inside the collecting frame, and the second partition divides the interior of the collecting frame into a first collecting chamber and a second collecting chamber, and the first collecting chamber and the second collecting chamber correspond to the air inlet chamber and the air outlet chamber up and down, and four connecting ports are opened at the bottom end of the ventilation box body, and the four connecting ports are respectively arranged on the front and back sides of the two movable frames, the air inlet chamber is connected with the interior of the first collecting chamber through two connecting ports, and the air outlet chamber is connected with the interior of the second collecting chamber through the other two connecting ports, and a sealing cover is provided at the bottom end of the collecting frame.

[0016] Also includes the ventilation method of the building ventilation equipment:

[0017] S1: Start the air intake fan, the outdoor air will enter the air intake cavity through the first air intake pipe, the air entering the air intake cavity will be filtered by the first filter plate, and the air filtered by the first filter plate will be blown into the room from the first air outlet pipe;

[0018] S2: Start the exhaust fan, and the indoor air enters the air outlet cavity through the second air inlet pipe. The air entering the air outlet cavity is filtered by the second filter plate, and the air filtered by the second filter plate is blown to the outside through the second air outlet pipe;

[0019] S3: After a period of time, the motor is started, and the output shaft of the motor drives a threaded rod to rotate, and the threaded rod drives another threaded rod to rotate through two synchronous wheels and a synchronous belt. Since the threaded rod is threadedly connected to the threaded groove, the two movable frames move toward each other as the two threaded rods rotate, so that the second filter plate moves into the air inlet cavity, and the first filter plate moves into the air outlet cavity. At this time, the air inlet fan and the air outlet fan will back-blow and clean the second filter plate and the first filter plate respectively, so that the dust on the first filter plate and the second filter plate can be back-blown away, and the fallen dust will fall into the collection frame through the connecting port;

[0020] S4: Pull the pull block outward, the pull block drives the limit rod to move outward and stretch the spring, when one end of the limit rod leaves the limit hole on the second plug-in block, remove the box cover from the top of the ventilation box body, the box cover drives the second plug-in block to leave the second plug-in slot, remove the top plate from the top of the movable frame, and then remove the first filter screen plate and the second filter screen plate from the limit card slot on the movable frame, so that the first filter screen plate and the second filter screen plate can be cleaned finely;

[0021] S5: During the filtering process, the dust filtered by the first filter plate and the second filter plate will fall from the connecting port into the first collecting chamber and the second collecting chamber. When a lot of dust accumulates inside the collecting frame, the sealing cover is removed from the bottom of the collecting frame so that the dust inside the collecting frame can be discharged.

[0022] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0023] 1. By rotating the two threaded rods to adjust the positions of the two movable frames, the first filter screen plate and the second filter screen plate can be periodically exchanged back and forth inside the air inlet cavity and the air outlet cavity, so that the first filter screen plate and the second filter screen plate can be back-blown and cleaned, effectively avoiding the accumulation of dust on the first filter screen plate and the second filter screen plate, so that the ventilation equipment can maintain normal operation for a long time, and also avoiding the accumulation of dust on the first filter screen plate and the second filter screen plate to breed bacteria, thereby ensuring the quality of ventilation;

[0024] 2. By taking out the first filter screen plate and the second filter screen plate from the two movable frames and the top plate, the first filter screen plate and the second filter screen plate can be cleaned finely, and then the dust that cannot be removed by backblowing can be cleaned, making the cleaning of the first filter screen plate and the second filter screen plate simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the ventilation box body and its internal structure of the present invention;

[0029] Figure 4 The 3D cross-sectional view of the ventilation box of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 5 The 3D cross-sectional view of the ventilation box of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 6 For the present invention Figure 5 A is a schematic diagram of the enlarged structure;

[0032] Figure 7 It is a schematic diagram of the bottom view of the box cover of the present invention;

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of the air outlet fan and the third filter screen plate of the present invention;

[0034] Fig. 9 It is a schematic diagram of the three-dimensional structure of the movable frame, the top plate and the first filter screen plate of the present invention;

[0035] Fig.10 For the present invention Fig. 9 Middle B is a schematic diagram of the enlarged structure;

[0036] Fig.11 It is a schematic diagram of the three-dimensional structure of the threaded rod, motor, synchronous wheel and synchronous belt of the present invention;

[0037] Fig.12 The 3D cross-sectional view of the ventilation box of the present invention is shown in FIG. Figure 3 ;

[0038] Fig.13 It is a schematic diagram of the three-dimensional structure of the collection frame of the present invention.

[0039] Description of reference numerals:

[0040] 1. Ventilation box; 2. First partition; 3. Air inlet cavity; 4. Air outlet cavity; 5. Movable frame; 6. Top plate; 7. First filter screen; 8. Second filter screen; 9. Air inlet fan; 10. Air outlet fan; 11. Threaded rod; 12. Threaded groove; 13. Motor; 14. Synchronous wheel; 15. Synchronous belt; 16. First air outlet duct; 17. First air inlet duct; 18. Second air outlet duct; 19. Second air inlet duct; 20. Box Cover; 21. Mounting slot; 22. Rubber gasket; 23. Limiting slot; 24. Third filter screen; 25. First plug-in block; 26. First plug-in slot; 27. Second plug-in block; 28. Second plug-in slot; 29. ​​Limiting rod; 30. Limiting hole; 31. Pull block; 32. Spring; 33. Collection frame; 34. Second partition; 35. First collection chamber; 36. Second collection chamber; 37. Connecting port; 38. Blocking cover. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] The present invention provides Figures 1 to 4 and Figures 11 to 13 A building ventilation device and a ventilation method thereof are shown, comprising:

[0043] A ventilation box body 1, a first partition plate 2 is fixedly arranged inside the ventilation box body 1, the first partition plate 2 divides the interior of the ventilation box body 1 into an air inlet chamber 3 and an air outlet chamber 4, a movable frame 5 is arranged inside the air inlet chamber 3 and the air outlet chamber 4, a top plate 6 is arranged at the top of the movable frame 5, and a limit card slot 23 is arranged at the inner end of the movable frame 5 and the top plate 6, and a first filter screen plate 7 and a second filter screen plate 8 are arranged inside the two limit card slots 23 respectively, an air inlet fan 9 connected to the interior of the air inlet chamber 3 is fixedly arranged at the front end of the ventilation box body 1, and an air outlet fan 10 connected to the interior of the air outlet chamber 4 is fixedly arranged at the rear end of the ventilation box body 1;

[0044] Two threaded rods 11, both ends of the two threaded rods 11 are rotatably connected to the inner side walls of the ventilation box 1 through bearings, a threaded groove 12 is opened at the bottom of the movable frame 5, one end of the threaded rod 11 passes through the threaded groove 12 and is threadedly connected with the threaded groove 12, a motor 13 is fixedly arranged on one side of the ventilation box 1, the output shaft of the motor 13 is fixedly connected to one end of one of the threaded rods 11, a synchronous wheel 14 is fixedly arranged on one end of the threaded rod 11, the two synchronous wheels 14 are arranged on one side of the ventilation box 1, and the two synchronous wheels 14 are connected by a synchronous belt 15.

[0045] The air outlet end of the air intake fan 9 is fixedly connected to a first air outlet duct 16, the rear end of the ventilation box body 1 is fixedly provided with a first air inlet duct 17 connected to the interior of the air intake cavity 3, the air outlet end of the air outlet fan 10 is fixedly provided with a second air outlet duct 18, and the front end of the ventilation box body 1 is fixedly provided with a second air inlet duct 19 connected to the interior of the air outlet cavity 4.

[0046] A box cover 20 is provided at the top of the ventilation box body 1, and two installation grooves 21 are provided on the inner wall of the ventilation box body 1 and the bottom of the box cover 20. Rubber gaskets 22 are fixed at the inner ends of the installation grooves 21, and two movable frames 5 and the top plate 6 are respectively arranged at the inner ends of the two rubber gaskets 22.

[0047] A third filter screen plate 24 is fixedly provided at the air inlet end of the air inlet fan 9 and the air inlet end of the air outlet fan 10 .

[0048] A collecting frame 33 is fixedly provided at the bottom end of the ventilation box body 1, and a second partition plate 34 is fixedly provided inside the collecting frame 33. The second partition plate 34 divides the inside of the collecting frame 33 into a first collecting chamber 35 and a second collecting chamber 36. The first collecting chamber 35 and the second collecting chamber 36 correspond to the air inlet chamber 3 and the air outlet chamber 4 in upper and lower directions. Four connecting ports 37 are opened at the bottom end of the ventilation box body 1. The four connecting ports 37 are respectively arranged on the front and rear sides of the two movable frames 5. The air inlet chamber 3 is connected with the inside of the first collecting chamber 35 through two connecting ports 37, and the air outlet chamber 4 is connected with the inside of the second collecting chamber 36 through the other two connecting ports 37. A sealing cover 38 is provided at the bottom end of the collecting frame 33.

[0049] When the air intake fan 9 is started, outdoor air will enter the air intake chamber 3 through the first air intake pipe 17, the air entering the air intake chamber 3 will be filtered by the first filter screen 7, and the air filtered by the first filter screen 7 will be blown into the room from the first air outlet pipe 16. When the air outlet fan 10 is started, the indoor air will enter the air outlet chamber 4 through the second air intake pipe 19, the air entering the air outlet chamber 4 will be filtered by the second filter screen 8, and the air filtered by the second filter screen 8 will be blown to the outdoors from the second air outlet pipe 18. During the filtering process, the dust filtered on the first filter screen 7 and the second filter screen 8 will fall from the connecting port 37 into the first collecting chamber 35 and the second collecting chamber 36. After a lot of dust accumulates inside the collecting frame 33, the sealing cover 38 is removed from the bottom end of the collecting frame 33, so that the dust inside the collecting frame 33 can be discharged.

[0050] After a period of time, the motor 13 is started, and the output shaft of the motor 13 drives a threaded rod 11 to rotate, and the threaded rod 11 drives another threaded rod 11 to rotate through two synchronous wheels 14 and a synchronous belt 15. Since the threaded rod 11 is threadedly connected to the thread groove 12, the two movable frames 5 move toward each other as the two threaded rods 11 rotate and stagger. In this way, the second filter screen plate 8 will move into the air inlet chamber 3, and the first filter screen plate 7 will move into the air outlet chamber 4. At this time, the air inlet fan 9 and the air outlet fan 10 will respectively back-blow and clean the second filter screen plate 8 and the first filter screen plate 7, so that the dust on the first filter screen plate 7 and the second filter screen plate 8 can be back-blown away, and the fallen dust will fall into the collection frame 33 through the connecting port 37;

[0051] The present invention adjusts the positions of the two movable frames 5 by rotating the two threaded rods 11, and then the first filter plate 7 and the second filter plate 8 can be periodically exchanged back and forth inside the air inlet chamber 3 and the air outlet chamber 4, so that the first filter plate 7 and the second filter plate 8 can be backblown and cleaned, effectively avoiding the accumulation of dust on the first filter plate 7 and the second filter plate 8, so that the ventilation equipment can maintain normal operation for a long time, and also avoiding the accumulation of dust on the first filter plate 7 and the second filter plate 8 to breed bacteria, thereby ensuring the quality of ventilation. This embodiment specifically solves the problem that in the actual use of building ventilation equipment in the prior art, dust will accumulate on the filter screen inside after long-term use, and the dust will cause blockage to the filter screen, which will affect the normal ventilation work of the ventilation equipment, and the dust accumulated on the filter screen will breed bacteria, which will affect the quality of ventilation.

[0052] The present invention provides Figures 5 to 10A building ventilation device and a ventilation method thereof are shown, wherein two first plug-in blocks 25 are fixedly provided at the bottom end of the top plate 6, two first plug-in slots 26 are opened at the top end of the movable frame 5, the first plug-in block 25 is arranged inside the first plug-in slot 26, a second plug-in block 27 is fixedly provided on the front and rear sides of the bottom end of the ventilation box body 1, a second plug-in slot 28 is opened on the front and rear sides of the top end of the ventilation box body 1, and the second plug-in block 27 is arranged inside the second plug-in slot 28.

[0053] Limit rods 29 are provided at the top of the front and rear ends of the ventilation box body 1, and limit holes 30 are opened on the second plug-in block 27. One end of the two limit rods 29 passes through the top of the front and rear ends of the ventilation box body 1 respectively and extends into the two limit holes 30. A pull block 31 is fixedly provided at the other end of the limit rod 29, and a spring 32 is sleeved on the outer end of the limit rod 29. The two ends of the spring 32 are respectively fixedly connected to the inner side of the pull block 31 and the ventilation box body 1.

[0054] The pull block 31 is pulled outward, and the pull block 31 drives the limiting rod 29 to move outward and stretch the spring 32. When one end of the limiting rod 29 leaves the limiting hole 30 on the second plug-in block 27, the box cover 20 is removed from the top of the ventilation box body 1, and the box cover 20 drives the second plug-in block 27 to leave the second plug-in slot 28. At this time, the top plate 6 is removed from the top of the movable frame 5, and then the first filter panel 7 and the second filter panel 8 are taken out from the limiting card slot 23 on the movable frame 5. In this way, the first filter panel 7 and the second filter panel 8 can be finely cleaned. By taking the first filter panel 7 and the second filter panel 8 out of the two movable frames 5 and the top plate 6, the first filter panel 7 and the second filter panel 8 can be finely cleaned, and then the dust that cannot be removed by backblowing can be cleaned, making the cleaning of the first filter panel 7 and the second filter panel 8 relatively simple and convenient.

[0055] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A building ventilation device, characterized in that: include: A ventilation box (1), wherein a first partition (2) is fixedly provided inside the ventilation box (1), and the first partition (2) divides the interior of the ventilation box (1) into an air inlet chamber (3) and an air outlet chamber (4); a movable frame (5) is provided inside each of the air inlet chamber (3) and the air outlet chamber (4); a top plate (6) is provided at the top of the movable frame (5); a limit slot (23) is provided at the inner end of the movable frame (5) and the top plate (6); a first filter screen (7) and a second filter screen (8) are provided inside the two limit slots (23), respectively; an air inlet fan (9) connected to the interior of the air inlet chamber (3) is fixedly provided at the front end of the ventilation box (1); and an air outlet fan (10) connected to the interior of the air outlet chamber (4) is fixedly provided at the rear end of the ventilation box (1); Two threaded rods (11), both ends of the two threaded rods (11) are rotatably connected to the inner side walls of the ventilation box (1) via bearings, a threaded groove (12) is provided at the bottom end of the movable frame (5), one end of the threaded rod (11) passes through the inside of the threaded groove (12) and is threadedly connected to the threaded groove (12), a motor (13) is fixedly provided on one side of the ventilation box (1), and the output shaft of the motor (13) is fixedly connected to one end of one of the threaded rods (11).

2. A building ventilation device according to claim 1, characterized in that: A synchronous wheel (14) is fixedly provided at one end of the threaded rod (11), and the two synchronous wheels (14) are arranged on one side of the ventilation box body (1), and the two synchronous wheels (14) are connected via a synchronous belt (15).

3. A building ventilation device according to claim 1, characterized in that: The air outlet end of the air inlet fan (9) is fixedly connected to a first air outlet pipe (16); the rear end of the ventilation box (1) is fixedly provided with a first air inlet pipe (17) connected to the interior of the air inlet cavity (3); the air outlet end of the air outlet fan (10) is fixedly provided with a second air outlet pipe (18); and the front end of the ventilation box (1) is fixedly provided with a second air inlet pipe (19) connected to the interior of the air outlet cavity (4).

4. A building ventilation device according to claim 1, characterized in that: The top of the ventilation box body (1) is provided with a box cover (20), the inner wall of the ventilation box body (1) and the bottom of the box cover (20) are provided with two installation grooves (21), the inner ends of the installation grooves (21) are fixed with rubber gaskets (22), and the two movable frames (5) and the top plate (6) are respectively arranged at the inner ends of the two rubber gaskets (22).

5. A building ventilation device according to claim 1, characterized in that: A third filter screen plate (24) is fixedly provided at the air inlet end of the air inlet fan (9) and the air inlet end of the air outlet fan (10).

6. A building ventilation device according to claim 1, characterized in that: Two first plug-in blocks (25) are fixedly provided at the bottom end of the top plate (6), two first plug-in slots (26) are provided at the top end of the movable frame (5), and the first plug-in blocks (25) are arranged inside the first plug-in slots (26).

7. A building ventilation device according to claim 1, characterized in that: A second plug-in block (27) is fixedly provided on the front and rear sides of the bottom end of the ventilation box body (1), a second plug-in slot (28) is provided on the front and rear sides of the top end of the ventilation box body (1), and the second plug-in block (27) is arranged inside the second plug-in slot (28).

8. A building ventilation device according to claim 7, characterized in that: Limit rods (29) are provided at the top of the front and rear ends of the ventilation box body (1), and the second plug-in block (27) is provided with a limit hole (30). One end of the two limit rods (29) passes through the top of the front and rear ends of the ventilation box body (1) and extends into the two limit holes (30). The other end of the limit rod (29) is fixedly provided with a pull block (31). The outer end of the limit rod (29) is sleeved with a spring (32), and the two ends of the spring (32) are respectively fixedly connected to the inner side of the pull block (31) and the ventilation box body (1).

9. A building ventilation device according to claim 1, characterized in that: A collecting frame (33) is fixedly provided at the bottom end of the ventilation box body (1), and a second partition plate (34) is fixedly provided inside the collecting frame (33). The second partition plate (34) divides the inside of the collecting frame (33) into a first collecting chamber (35) and a second collecting chamber (36). The first collecting chamber (35) and the second collecting chamber (36) correspond to the air inlet chamber (3) and the air outlet chamber (4) in upper and lower directions. Four connecting ports (37) are provided at the bottom end of the ventilation box body (1), and the four connecting ports (37) are respectively provided at the front and rear sides of the two movable frames (5). The air inlet chamber (3) is connected to the inside of the first collecting chamber (35) through two connecting ports (37), and the air outlet chamber (4) is connected to the inside of the second collecting chamber (36) through the other two connecting ports (37). A blocking cover (38) is provided at the bottom end of the collecting frame (33).

10. A building ventilation device according to any one of claims 1 to 9, characterized in that: Also includes the ventilation method of the building ventilation equipment: S1: Start the air intake fan (9), and the outdoor air will enter the air intake chamber (3) through the first air intake pipe (17). The air entering the air intake chamber (3) will be filtered by the first filter screen (7), and the air filtered by the first filter screen (7) will be blown into the room through the first air outlet pipe (16); S2: starting the exhaust fan (10), the indoor air enters the exhaust cavity (4) through the second air inlet pipe (19), the air entering the exhaust cavity (4) is filtered by the second filter screen (8), and the air filtered by the second filter screen (8) is blown to the outside through the second exhaust pipe (18); S3: After a period of time, the motor (13) is started, and the output shaft of the motor (13) drives a threaded rod (11) to rotate. The threaded rod (11) drives another threaded rod (11) to rotate through two synchronous wheels (14) and a synchronous belt (15). Since the threaded rod (11) is threadedly connected to the thread groove (12), the two movable frames (5) move toward each other with the rotation of the two threaded rods (11), so that the second filter screen plate (8) moves to the inside of the air inlet chamber (3), and the first filter screen plate (7) moves to the inside of the air outlet chamber (4). At this time, the air inlet fan (9) and the air outlet fan (10) will respectively back-blow and clean the second filter screen plate (8) and the first filter screen plate (7), so that the dust on the first filter screen plate (7) and the second filter screen plate (8) can be back-blown away, and the fallen dust will fall into the collection frame (33) through the connecting port (37); S4: Pull the pull block (31) outward, the pull block (31) drives the limiting rod (29) to move outward and stretch the spring (32), when one end of the limiting rod (29) leaves the limiting hole (30) on the second plug-in block (27), the box cover (20) is removed from the top of the ventilation box body (1), the box cover (20) drives the second plug-in block (27) to leave the second plug-in slot (28), and the top plate (6) is removed from the top of the movable frame (5), and then the first filter screen plate (7) and the second filter screen plate (8) are taken out from the limiting slot (23) on the movable frame (5), so that the first filter screen plate (7) and the second filter screen plate (8) can be cleaned finely; S5: During the filtering process, the dust filtered by the first filter screen plate (7) and the second filter screen plate (8) will fall from the connecting port (37) into the first collecting chamber (35) and the second collecting chamber (36). After a large amount of dust is accumulated inside the collecting frame (33), the blocking cover (38) is removed from the bottom end of the collecting frame (33), so that the dust inside the collecting frame (33) can be discharged.

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