A filtering device for a ventilator

Abstract

The present invention relates to the technical field of respiratory devices. Disclosed is a filtering device for a ventilator, which includes a filtering layer, and further includes a fixing block detachably connected to a blower. A pipe vertically penetrates through and is fixedly connected to the middle of the fixing block; a dust-proof mechanism for dust-proofing the pipe is provided at the top of the fixing block. The filtering layer abuts against the bottom of the pipe, and the filtering layer is detachably connected to the fixing block. This solution mainly solves the problem that in cities with a large amount of dust, users need to replace the filtering layer multiple times a day, greatly reducing the safety of users.

Description

Technical Field

[0001] The present invention relates to the technical field of breathing devices. Background Art

[0002] The N95 mask can isolate smaller particles, and its filtration efficiency for particles with an aerodynamic diameter of 0.075 µm ± 0.02 µm reaches more than 95%. The aerodynamic diameters of airborne bacteria and fungal spores vary between 0.7 - 10 µm, and such airborne bacteria and fungal spores are also within the protection range of the N95 mask. Moreover, the N95 mask fits more closely to the face and is not prone to air leakage from the periphery. However, after wearing the N95 mask for a long time, it is easy to cause difficulty in breathing for users due to its good isolation performance, and even symptoms such as dizziness may occur due to hypoxia. Especially for the elderly and children with relatively weak constitutions, a facial protection device that can provide facial protection for users and ensure smooth breathing has emerged as the times require.

[0003] Existing facial protection devices include a breathing mask and a breathing machine for filtering air. Among them, the breathing machine successively includes a connected filter layer and a blower, and then the outlet of the blower is communicated with the breathing mask; during actual use, the filter layer is directly connected to the air inlet of the blower, that is, the filter layer is directly exposed to the air; in cities with more sand and dust, a large amount of dust will adhere to the surface of the filter layer, affecting its hygiene, resulting in the need to replace the filter layer multiple times a day; each time a new filter layer is replaced, the user has the opportunity to come into contact with external pollutants or droplets carrying germs of others, and replacing the filter layer multiple times will directly greatly reduce the safety of the user. Summary of the Invention

[0004] The present invention aims to provide a filtering device for a breathing machine to solve the problem that in cities with a large amount of dust, users need to replace the filter layer multiple times a day, greatly reducing the safety of users.

[0005] To achieve the above object, the basic scheme of the present invention is as follows: A filtering device for a breathing machine includes a filter layer, and further includes a fixing block detachably connected to a blower. A pipe is vertically penetrated and fixedly connected in the middle of the fixing block; a dust-proof mechanism for dust-proofing the pipe is provided at the top of the fixing block. The filter layer abuts against the bottom of the pipe, and the filter layer is detachably connected to the fixing block.

[0006] Advantages of the basic scheme:

[0007] 1. This solution connects the fixed block to the air inlet of the fan. When the fan is started, it generates air flow, sucking in outside air through the dust-proof mechanism, pipeline, and filter layer. Compared with the prior art, this solution is applicable to general cities, and is more suitable for cities with large amounts of sand and dust. By blocking dust in the air through the dust-proof mechanism, the amount of dust adhering to the filter layer is effectively reduced, thereby extending the service life of the filter layer; moreover, it also reduces costs and avoids the safety issues faced by users when replacing the filter layer multiple times a day.

[0008] 2. The fixed block and the fan in this solution are detachably connected, which is convenient for installation and disassembly; in a highly virus-contaminated environment, the fixed block in this solution can be used as a disposable product. After use, it can be directly disassembled for recycling without being used a second time, thus avoiding the harm caused by secondary use.

[0009] 3. The filter layer and the fixed block in this solution are detachably connected, which is convenient for installation and disassembly; in a highly virus-contaminated environment, the filter layer in this solution can be used as a disposable product. After use, it can be directly disassembled for recycling without being used a second time, thus avoiding the harm caused by secondary use.

[0010] Furthermore, the dust-proof mechanism includes a box body fixed to the top of the fixed plate and side holes opened on both sides of the box body; the box body communicates with the pipeline; dust-proof nets are provided on the side holes, and dust-proof shafts are rotatably connected to the dust-proof nets, and negative pressure blades are provided on the dust-proof shafts.

[0011] With the above settings, the air flow acts on the negative pressure blades, thereby driving the negative pressure blades to rotate, accelerating the inhalation speed of outside air; the air passing through the dust-proof net can block the dust in the air outside, and the air enters the pipeline through the dust-proof net.

[0012] Furthermore, a first dust-proof plate and a second dust-proof plate are provided in the pipeline, and the first dust-proof plate is higher than the second dust-proof plate; a number of first air holes are provided on the first dust-proof plate, and a number of second air holes are provided on the second dust-proof plate; filter nets are provided on both the first air holes and the second air holes.

[0013] With the above settings, the air entering the pipeline will pass through the first dust-proof plate and the second dust-proof plate in sequence. Specifically: the air passes through the first air holes and the second air holes in sequence, and the dust is filtered again through the filter nets, further strengthening the isolation of dust in the air; the air continues to flow towards the filter layer and is filtered by the filter layer. On the one hand, it reduces the pollution of the filter layer, extends the service time of the filter layer, thereby reducing costs and also avoiding the safety issues faced by users when replacing the filter layer multiple times a day. On the other hand, it also greatly reduces the amount of dust in the air entering the fan.

[0014] Furthermore, an opening is provided at the top of the box body, and a box cover is detachably connected to the opening.

[0015] With the above settings, after use, the lid can be removed from the opening, and then the dust inside the box, at the upper end of the pipeline, and on the top of the first dust-proof plate can be cleared. Then, the filter layer can be removed or replaced, and at this time, the dust at the bottom of the second dust-proof plate and the lower end of the pipeline can be cleared; therefore, this solution can be used repeatedly, reducing costs and having strong practicability.

[0016] Furthermore, a chamber is provided inside the fixed block. A first rotating shaft and a second rotating shaft are rotatably connected inside the chamber. A first belt is provided between the first rotating shaft and the second rotating shaft; a fan blade is provided on the first rotating shaft; a transverse hole communicating with the first air hole is provided on the first dust-proof plate, and a transverse block extending into the chamber is slidably connected inside the transverse hole. A first spring is provided between the transverse block and the pipeline; a steel wire rope is connected to the transverse block and is wound and fixed on the second rotating shaft; several third air holes communicating with the first air hole are provided on the transverse block; a power mechanism for driving the first rotating shaft to rotate is provided inside the chamber; an air inlet pipe and an air outlet pipe are respectively provided on both sides of the pipeline, and both the air inlet pipe and the air outlet pipe are located between the first dust-proof plate and the second dust-proof plate. A wind mechanism communicating with the air inlet pipe and a blocking mechanism for opening and closing the air outlet pipe as the transverse block reciprocates are provided inside the chamber.

[0017] With the above settings, after using for a period of time, the power mechanism drives the first rotating shaft to rotate. The first rotating shaft drives the second rotating shaft to rotate through the first belt. The second rotating shaft pulls the transverse block to move rightward in the transverse hole through the steel wire rope, causing the first spring to compress.

[0018] When the transverse block moves rightward, the first air hole and the third air holes are misaligned, and then the first air hole is blocked by the transverse block. Therefore, no air will pass through the first dust-proof plate; the blocking mechanism opens the air outlet pipe as the transverse block moves; the wind mechanism generates an air flow. The air flow enters the pipeline through the air inlet pipe, and the air flow is located between the first dust-proof plate and the second dust-proof plate. The dust at the bottom of the first dust-proof plate and the top of the second dust-proof plate can be blown away by the air flow, and the dust is discharged into the chamber from the air outlet pipe along with the air flow.

[0019] Furthermore, the power mechanism includes a first air pipe and a second air pipe fixedly connected to the chamber. An airbag is provided between the first air pipe and the second air pipe. The first air pipe is communicated with the pipeline. A one-way valve for the gas to flow unidirectionally towards the airbag is provided on the first air pipe. A pressure relief valve is provided on the second air pipe, and the second air pipe is arranged towards the direction of the fan blade.

[0020] With the above settings, after air enters the pipeline, a part of the air will enter the first trachea. Due to the setting of the one-way valve, the air can only move towards the airbag through the first trachea. As more and more air enters the airbag, the airbag continuously expands. When the pressure value in the airbag is greater than the critical value of the pressure relief valve, the pressure relief valve opens, and the gas in the airbag is ejected through the second trachea and acts on the fan blades, causing the fan blades to rotate, which in turn drives the rotation of the first rotating shaft.

[0021] Furthermore, the wind power mechanism includes a wind power shaft rotatably connected to the chamber and wind power blades fixedly connected to the wind power shaft. The wind power blades are located in the air inlet pipe, and a second belt is provided between the wind power shaft and the dust-proof shaft.

[0022] With the above settings, the dust-proof shaft can also drive the rotation of the wind power shaft through the second belt, and the wind power shaft drives the wind power blades to rotate, thereby generating an air flow in the air inlet pipe.

[0023] Furthermore, the transverse block is slidably connected to the air inlet pipe, and the transverse block is provided with a vertical hole and an air outlet hole communicating with the air inlet pipe; a filter block is provided in the vertical hole; a corrugated pipe is connected to the side wall of the fixed block, and the corrugated pipe is communicated with the air outlet hole.

[0024] With the above settings, when the transverse block moves to the right, the air outlet hole is misaligned with the air inlet pipe, while the vertical hole is communicated with the air inlet pipe; the air flow in the air inlet pipe is filtered by the filter block and then enters the pipeline; the corrugated pipe can automatically stretch and contract with the horizontal reciprocating movement of the transverse block without affecting the work.

[0025] Furthermore, the blocking mechanism includes a first wedge block fixedly connected to the chamber and a cylinder fixedly connected to the transverse block. The first wedge block is located between the transverse block and the air outlet pipe; a second wedge block for blocking the air outlet pipe is vertically slidably connected in the cylinder, and a second spring is provided between the second wedge block and the cylinder; the second wedge block abuts against the first wedge block.

[0026] With the above settings, when the transverse block moves to the right, the transverse block drives the first wedge block and the cylinder to move to the right together. Since the first wedge block abuts against the second wedge block, the first wedge block moves upward in the cylinder, and the second spring is compressed, that is, the blocking effect of the first wedge block on the air outlet pipe disappears, and the air outlet pipe is opened.

[0027] Furthermore, a third rotating shaft is rotatably connected in the chamber, and a third belt is provided between the third rotating shaft and the second rotating shaft; a dust-attracting layer is provided on the third belt; the air outlet pipe is arranged facing the third belt; an auxiliary hole is provided on the fixed block, and a sealing cover is detachably connected to the auxiliary hole.

[0028] Through the above settings, the dust is driven by the air outlet pipe and acts on the dust adhesion layer along with the airflow, thereby realizing the collection of dust; after use, the sealing cover is removed from the auxiliary hole, and the dust adhesion layer is replaced to be used for dust collection again. Description of the Drawings

[0029] Figure 1 Figure 1 is a partial cross-sectional view in the front view direction of the first embodiment of a filtering device for a ventilator according to the present invention;

[0030] Figure 2 Figure 2 is a partial cross-sectional view in the front view direction of the second embodiment of a filtering device for a ventilator according to the present invention;

[0031] Figure 3 is Figure 2 the enlarged view of part A in

[0032] Figure 4 is Figure 2 the enlarged view of part B in

[0033] Figure 5 is Figure 2 the enlarged view of part C in

[0034] Figure 6 Figure 3 is a partial cross-sectional view in the front view direction of the third embodiment of a filtering device for a ventilator according to the present invention. Detailed Description of the Embodiments

[0035] The following is a further detailed description through specific embodiments:

[0036] The reference numerals in the accompanying drawings of the specification include: filter layer 1, fixing block 2, pipe 3, box body 4, dust-proof net 5, dust-proof shaft 6, negative pressure blade 7, first dust-proof plate 8, second dust-proof plate 9, filter screen 10, chamber 11, first rotating shaft 12, second rotating shaft 13, first belt 14, fan blade 15, transverse block 16, first spring 17, steel wire rope 18, air inlet pipe 19, air outlet pipe 20, first air pipe 21, second air pipe 22, airbag 23, one-way valve 24, pressure relief valve 25, wind shaft 26, wind blade 27, second belt 28, vertical hole 29, air outlet hole 30, filter block 31, corrugated pipe 32, first wedge block 33, cylinder 34, second wedge block 35, second spring 36, box cover 37, third rotating shaft 38, third belt 39, dust adhesion layer 40, sealing cover 41.

[0037] Embodiment 1

[0038] Basically as shown in Figure 1 the figure: a filtering device for a ventilator, including a filter layer 1 and a fixing block 2, the fixing block 2 is U-shaped, and the fixing block 2 is fixed at the air inlet of the fan by bolts.

[0039] A pipe 3 runs vertically through the middle of the fixed block 2, and the pipe 3 is fixed to the fixed block 2 by bolts; a dust-proof mechanism is arranged at the top of the pipe 3. The dust-proof mechanism includes a box body 4 fixed to the top of the fixed plate and side holes opened on both sides of the box body 4. The box body 4 is fixed to the fixed plate by bolts, and the bottom of the box body 4 communicates with the pipe 3; a dust-proof net 5 is welded on the side hole, and a dust-proof shaft 6 is rotatably connected to the dust-proof net 5, and a negative pressure blade 7 is fixed to the dust-proof shaft 6. An opening is formed at the top of the box body 4, and a box cover 37 is threadedly connected to the opening. The filter layer 1 abuts against the bottom of the pipe 3, and the filter layer 1 is fixed to the fixed block 2 by bolts.

[0040] A first dust-proof plate 8 and a second dust-proof plate 9 are fixed in the pipe 3 by bolts, and the first dust-proof plate 8 is higher than the second dust-proof plate 9; a number of first air holes are opened on the first dust-proof plate 8, and a number of second air holes are opened on the second dust-proof plate 9. Filter nets 10 are fixed to the upper and lower ends of the first air holes and the upper and lower ends of the second air holes.

[0041] The specific implementation process is as follows:

[0042] Start the fan. The fan generates air flow and sucks the outside air into the pipe 3 and the filter layer 1; during the process of the air flow moving into the pipe 3, the air flow acts on the negative pressure blade 7, thereby driving the negative pressure blade 7 to rotate, accelerating the suction speed of the outside air; the air passing through the dust-proof net 5 can block the dust of the air outside, and the air enters the pipe 3 through the dust-proof net 5.

[0043] The air entering the pipe 3 will pass through the first dust-proof plate 8 and the second dust-proof plate 9 in sequence. Specifically: the air passes through the first air holes and the second air holes in sequence, and the dust is filtered again through the filter nets 10, further strengthening the isolation of the dust in the air; the air continues to flow towards the filter layer 1 and is filtered by the filter layer 1 again. On the one hand, it reduces the pollution of the filter layer 1, prolongs the service life of the filter layer 1, thereby reducing the cost, and also avoids the safety problems faced by the user when replacing the filter layer 1 multiple times a day. On the other hand, it also greatly reduces the amount of dust in the air entering the fan. In a highly virus-contaminated environment, this solution can be used as a disposable product. After use, it can be directly disassembled for recycling without being used a second time, thereby avoiding the harm caused by secondary use.

[0044] When the use is completed, the box cover 37 can be removed from the opening, and then the dust in the box body 4, the upper end of the pipe 3 and the top of the first dust-proof plate 8 can be removed; then the filter layer 1 can be removed or replaced. At this time, the dust at the bottom of the second dust-proof plate 9 and the lower end of the pipe 3 can be removed; therefore, this solution can be reused, reducing the cost and having strong practicability. And, this solution is more cost-effective and more practical than other filtering devices.

[0045] Embodiment Two

[0046] Basically as shown in the appended Figure 2 , the appended Figure 3 , the appended Figure 4 and the appended Figure 5 as shown: The structure and implementation method of Example 2 are basically the same as those of Example 1, and the differences are as follows: A chamber 11 is opened in the fixed block 2, and a first rotating shaft 12 and a second rotating shaft 13 are rotatably connected in the chamber 11. Both the first rotating shaft 12 and the second rotating shaft 13 are located on the right side of the pipeline 3. A first belt 14 is sleeved between the first rotating shaft 12 and the second rotating shaft 13; A fan blade 15 is fixedly connected to the first rotating shaft 12; A transverse hole communicating with the first air hole is opened on the first dust-proof plate 8, and a transverse block 16 is slidably connected in the transverse hole. Both ends of the transverse block 16 extend into the chamber 11, and a first spring 17 is fixedly connected between the transverse block 16 and the pipeline 3; A steel wire rope 18 is connected to the right end of the transverse block 16, and the steel wire rope 18 is wound and fixedly connected to the second rotating shaft 13; A number of third air holes communicating with the first air hole are equidistantly opened in the horizontal direction on the transverse block 16.

[0047] A power mechanism for driving the first rotating shaft 12 to rotate is arranged in the chamber 11, and the power mechanism is located on the right side of the pipeline 3; The power mechanism includes a first air pipe 21 and a second air pipe 22 fixedly connected to the chamber 11. An air bag 23 is communicated between the first air pipe 21 and the second air pipe 22. The first air pipe 21 is communicated with the pipeline 3, and a one-way valve 24 for unidirectional gas flow towards the air bag 23 is fixedly connected to the first air pipe 21. A pressure relief valve 25 is fixedly connected to the second air pipe 22, and the second air pipe 22 is arranged towards the direction of the fan blade 15.

[0048] An air inlet pipe 19 and an air outlet pipe 20 are communicated with the side wall of the pipeline 3. The air inlet pipe 19 is located on the left side wall of the pipeline 3, and the right end of the air inlet pipe 19 is flared. The air outlet pipe 20 is located on the right side wall of the pipeline 3, and the left end of the air outlet pipe 20 is flared; Both the air inlet pipe 19 and the air outlet pipe 20 are located between the first dust-proof plate 8 and the second dust-proof plate 9.

[0049] Inside the chamber 11, there is a wind power mechanism communicated with the air inlet pipe 19 and a sealing mechanism for opening and closing the air outlet pipe 20 as the transverse block 16 reciprocates; the wind power mechanism includes a wind power shaft 26 rotatably connected to the chamber 11 and wind power blades 27 fixedly connected to the wind power shaft 26. The wind power blades 27 are located inside the air inlet pipe 19, and a second belt 28 is sleeved between the wind power shaft 26 and the dust-proof shaft 6 on the left. The transverse block 16 is slidably connected to the air inlet pipe 19, and a vertical hole 29 and an air outlet hole 30 communicated with the air inlet pipe 19 are opened on the transverse block 16; a filter block 31 is fixedly connected inside the vertical hole 29; a corrugated pipe 32 is fixedly connected to the side wall of the fixed block 2, and the corrugated pipe 32 is communicated with the air outlet hole 30. The corrugated pipe 32 can automatically stretch and contract as the transverse block 16 reciprocates horizontally without affecting the work. The sealing mechanism includes a first wedge block 33 fixedly connected to the chamber 11 and a cylinder 34 fixedly connected to the transverse block 16. Both the first wedge block 33 and the cylinder 34 are located on the right side of the pipe 3. The first wedge block 33 is fixed to the inner wall of the chamber 11 by bolts. The first wedge block 33 is located between the transverse block 16 and the air outlet pipe 20, and the first wedge block 33 is higher than the air outlet pipe 20; a second wedge block 35 for sealing the air outlet pipe 20 is vertically slidably connected inside the cylinder 34, and a second spring 36 is fixedly connected between the second wedge block 35 and the cylinder 34; the second wedge block 35 abuts against the first wedge block 33.

[0050] The specific implementation process is as follows:

[0051] The dust-proof shaft 6 on the left can also drive the rotation of the wind power shaft 26 through the second belt 28. The wind power shaft 26 drives the rotation of the wind power blades 27, thereby generating an air flow inside the air inlet pipe 19. The air flow is discharged outside the fixed block 2 through the air outlet pipe 20 and the corrugated pipe 32.

[0052] After the air enters the pipe 3, a part of the air will enter the first air pipe 21. Due to the setting of the one-way valve 24, the air can only move towards the airbag 23 through the first air pipe 21; as more and more air enters the airbag 23, the airbag 23 continuously expands. When the pressure value inside the airbag 23 is greater than the critical value of the pressure relief valve 25, the pressure relief valve 25 opens, and the gas inside the airbag 23 is ejected through the second air pipe 22 and acts on the fan blades 15. The fan blades 15 rotate, thereby driving the rotation of the first rotating shaft 12; the first rotating shaft 12 drives the rotation of the second rotating shaft 13 through the first belt 14, and the second rotating shaft 13 pulls the transverse block 16 to move to the right in the transverse hole through the steel wire rope 18, causing the first spring 17 to be compressed.

[0053] The horizontal block 16 moves to the right, causing the first air hole and the third air hole to be offset, and then blocking the first air hole through the horizontal block 16. Therefore, no air will pass through the first dust-proof plate 8. When the horizontal block 16 moves to the right, the horizontal block 16 drives the second wedge block 35 and the cylinder 34 to move to the right together. Since the first wedge block 33 abuts against the second wedge block 35, the second wedge block 35 moves upward in the cylinder 34, and the second spring 36 is compressed, that is, the blocking effect of the second wedge block 35 on the air outlet pipe 20 disappears, causing the air outlet pipe 20 to open. When the horizontal block 16 moves to the right, it can also cause the air outlet hole 30 to be offset from the air inlet pipe 19, while the vertical hole 29 communicates with the air inlet pipe 19. The air flow in the air inlet pipe 19 is filtered by the filter block 31 and then enters the pipe 3. The air flow can blow away the dust at the bottom of the first dust-proof plate 8 and the top of the second dust-proof plate 9. The dust is discharged into the chamber 11 from the air outlet pipe 20 along with the air flow. Using this intermittent dust removal method can avoid blocking the first dust-proof plate 8 and the second dust-proof plate 9. Moreover, when it is no longer in use, the box cover 37 can be removed from the opening, and then the dust inside the box body 4, the upper end of the pipe 3, and the top of the first dust-proof plate 8 can be removed; then the filter layer 1 can be removed or replaced. At this time, the dust at the bottom of the second dust-proof plate 9 and the lower end of the pipe 3 can be removed; therefore, this solution can be reused, reducing costs and having strong practicality.

[0054] Embodiment 3

[0055] Basically as shown in the attached Figure 6 figure: The structure and implementation method of Embodiment 3 are basically the same as those of Embodiment 2. The difference lies in that: a third rotating shaft 38 is rotatably connected in the chamber 11, and a third belt 39 is sleeved between the third rotating shaft 38 and the second rotating shaft 13. A dust-adhering layer 40 is adhered to the third belt 39, and the dust-adhering layer 40 is made of a flexible material; the air outlet pipe 20 is arranged facing the third belt 39; an auxiliary hole is opened on the fixed block 2, and a sealing cover 41 is threadedly connected to the auxiliary hole.

[0056] The specific implementation process is as follows:

[0057] The air outlet pipe 20 drives the dust to act on the dust-adhering layer 40 along with the air flow, thereby realizing the collection of dust; when it is no longer in use, the sealing cover 41 is removed from the auxiliary hole, and the dust-adhering layer 40 is replaced to be able to be used again for dust collection.

[0058] The above are only embodiments of the present invention, and common general knowledge of specific structures and / or characteristics in the solution is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A filtering device for a ventilator, comprising a filtering layer, characterized in that: It further includes a fixing block detachably connected to the fan. A pipe vertically penetrates through the middle of the fixing block and is fixedly connected thereto. A dust-proof mechanism for dust-proofing the pipe is provided at the top of the fixing block. The filter layer abuts against the bottom of the pipe, and the filter layer is detachably connected to the fixing block. The dust-proof mechanism includes a box body fixedly connected to the top of the fixing plate and side holes opened on both sides of the box body. The box body communicates with the pipe. Dust-proof nets are provided on the side holes, and dust-proof shafts are rotatably connected to the dust-proof nets. Negative pressure blades are provided on the dust-proof shafts. A first dust-proof plate and a second dust-proof plate are provided in the pipe, and the first dust-proof plate is higher than the second dust-proof plate. A number of first air holes are provided on the first dust-proof plate, and a number of second air holes are provided on the second dust-proof plate. Filter meshes are provided on both the first air holes and the second air holes. A chamber is provided in the fixing block. A first rotating shaft and a second rotating shaft are rotatably connected in the chamber. A first belt is provided between the first rotating shaft and the second rotating shaft. A fan blade is provided on the first rotating shaft. A transverse hole communicating with the first air hole is provided on the first dust-proof plate, and a transverse block extending into the chamber is slidably connected in the transverse hole. A first spring is provided between the transverse block and the pipe. A steel wire rope is connected to the transverse block and is wound and fixedly connected to the second rotating shaft. A number of third air holes communicating with the first air hole are provided on the transverse block. A power mechanism for driving the first rotating shaft to rotate is provided in the chamber. An air inlet pipe and an air outlet pipe are respectively provided on both sides of the pipe, and both the air inlet pipe and the air outlet pipe are located between the first dust-proof plate and the second dust-proof plate. A wind power mechanism communicating with the air inlet pipe and a blocking mechanism for opening and closing the air outlet pipe as the transverse block reciprocates are provided in the chamber. The transverse block is slidably connected to the air inlet pipe, and a vertical hole and an air outlet hole communicating with the air inlet pipe are provided on the transverse block. A filter block is provided in the vertical hole. A corrugated pipe is connected to the side wall of the fixing block and is communicated with the air outlet hole. When the transverse block moves towards the second rotating shaft, the first air hole and the third air hole are misaligned, the air outlet hole and the air inlet pipe are misaligned, and the vertical hole communicates with the air inlet pipe.

2. The filtering device for a ventilator according to claim 1, wherein: An opening is provided at the top of the box body, and a box cover is detachably connected to the opening.

3. The filtering device for a ventilator according to claim 1, wherein: The power mechanism includes a first air pipe and a second air pipe fixedly connected to the chamber. An airbag is provided between the first air pipe and the second air pipe. The first air pipe is communicated with the pipe. A one-way valve for unidirectional gas flow towards the airbag direction is provided on the first air pipe. A pressure relief valve is provided on the second air pipe, and the second air pipe is arranged towards the fan blade direction.

4. The filtering device for a ventilator according to claim 3, wherein: The wind power mechanism includes a wind power shaft rotatably connected to the chamber and wind power blades fixedly connected to the wind power shaft. The wind power blades are located in the air inlet pipe. A second belt is provided between the wind power shaft and the dust-proof shaft.

5. The filtering device for a ventilator according to claim 1, wherein: The blocking mechanism includes a first wedge block fixedly connected to the chamber and a cylinder fixedly connected to the transverse block. The first wedge block is located between the transverse block and the air outlet pipe. A second wedge block for blocking the air outlet pipe is vertically slidably connected in the cylinder, and a second spring is provided between the second wedge block and the cylinder. The second wedge block abuts against the first wedge block.

6. The filter device for a ventilator according to claim 5, characterized in that: A third rotating shaft is rotatably connected in the chamber, and a third belt is provided between the third rotating shaft and the second rotating shaft. A dust sticking layer is provided on the third belt; the air outlet pipe is arranged towards the third belt; an auxiliary hole is provided on the fixed block, and a sealing cover is detachably connected to the auxiliary hole.

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