Self-cleaning fresh air filtering device

Abstract

The invention provides a self-cleaning type fresh air filtering device, and relates to the technical field of fresh air filtering and cleaning, the self-cleaning type fresh air filtering device comprises a shell and a barrier plate, a rotating rod is rotatably connected to the barrier plate, a connecting block is fixedly connected to the rotating rod, and a connecting rod is fixedly connected to the side, away from the rotating rod, of the connecting block; and a filter screen is rotationally connected to the connecting rod and penetrates through the baffle, one end of the filter screen is arranged in the air inlet cavity, the side, away from the air inlet cavity, of the filter screen is arranged in the air outlet cavity, and a recycling device used for collecting impurities on the filter screen is arranged in the air outlet cavity. According to the fresh air filtering device, self-cleaning of the interior of the fresh air filtering device can be achieved to a certain extent, and the situation of shutdown caused by dismounting of the filtering net is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fresh air filtration and cleaning, and in particular to a self-cleaning fresh air filtration device. Background Art

[0002] Fresh air fans are used in factories to replace the air in the factories so that the temperature and humidity in the factories reach an appropriate state. Fresh air fans can effectively filter out harmful substances such as dust, smoke and formaldehyde in the factories. In closed or semi-closed factory environments, the use of fresh air fans can achieve effective ventilation and reduce the accumulation of harmful gases. At the same time, compared with traditional window ventilation, fresh air fans can recover heat during operation and reduce energy loss caused by ventilation.

[0003] Referring to the Chinese patent document with announcement number CN116085901B, entitled "An Intelligent Cabinet Self-cleaning Fresh Air System", the device detects the air volume in the cabinet by using a sensor. When the air volume decreases, the cleaning part is driven to move by the second transmission member, thereby cleaning the filter.

[0004] According to the above technical solution, when cleaning the filter in the fresh air fan, it is necessary to disassemble the filter from the fresh air unit and clean the impurities on the disassembled filter. When cleaning the impurities on the filter, it is necessary to first use a soft brush or a vacuum cleaner to clean the dust and dirt on the surface of the filter. During the cleaning process, there may be larger particles or debris attached to the filter. The staff is required to pat the filter to make the impurities on the filter fall off, and reassemble the cleaned filter in the fresh air fan to clean the filter. The operation is relatively cumbersome and the operation of the fresh air fan needs to be stopped, affecting its use. Summary of the invention

[0005] In view of this, the present application provides a self-cleaning fresh air filtering device, which aims to solve the problem of needing to stop the machine and disassemble the filter when cleaning the filter.

[0006] A self-cleaning fresh air filtering device provided in the present application adopts the following technical scheme, including a shell, a baffle plate fixedly connected to the shell, an air outlet chamber is arranged above the baffle plate, an air inlet chamber is arranged below the baffle plate, and a first air inlet and a first air outlet are provided on the shell for allowing external air to pass into the room, the first air inlet and the first air outlet are arranged at the air inlet chamber of the shell, a second air inlet and a second air outlet are provided on the shell for allowing internal air to pass to the outdoors, and the second air inlet and the second air outlet are arranged in the air outlet chamber of the shell; a rotating rod is rotatably connected to the baffle plate, a connecting block is fixedly connected to the rotating rod, a connecting rod is fixedly connected to a side of the connecting block away from the rotating rod, a filter net is rotatably connected to the connecting rod, the filter net is arranged through the baffle plate, and one end of the filter net is arranged in the air inlet chamber, and a side of the filter net away from the air inlet chamber is arranged in the air outlet chamber, and a recovery device for collecting impurities on the filter net is arranged in the air outlet chamber.

[0007] The filter is penetrated through the air inlet cavity and the air outlet cavity so that each part of the filter can be evenly exposed to the air flow during rotation, thereby extending the service life of the filter. When the filter rotates to the air outlet cavity, it is blown by the exhaust air, which can help remove impurities on the filter to a certain extent and reduce clogging of the filter.

[0008] Optionally, a sealing baffle is fixedly connected to the shell, a connecting port is opened on the sealing baffle, the filter screen is arranged in the connecting port, the connecting port is set to be circular, abutment springs are fixedly connected to the side of the sealing baffle close to the connecting port, the abutment springs are distributed in a circular array on the sealing baffle, and an abutment plate capable of abutting against the side wall of the filter screen is fixedly connected to the side of the abutment spring away from the sealing baffle.

[0009] The abutment plate is used to reduce the impact force that may be generated by the filter during movement, prevent the filter from directly hitting the shell, thereby avoiding damage and reducing impact damage. The service life of the filter can be extended, reducing the frequency and cost of replacing the filter.

[0010] Optionally, the recovery device includes a lower fixed plate fixedly connected to the baffle plate and arranged on a side facing the air outlet cavity, an upper fixed plate is fixedly connected to the shell, the upper fixed plate is arranged toward the baffle plate, and the upper fixed plate and the lower fixed plate are staggered.

[0011] Optionally, a connecting sleeve is fixedly connected in the air inlet chamber, a blanking port is opened on the baffle plate, and the blanking port is arranged on both sides of the lower fixed plate, and one end of the connecting sleeve is connected to the blanking port.

[0012] By recycling the impurities, the situation where the second air outlet is blocked by too many impurities can be reduced, and the impurities after cleaning can be collected, thereby reducing the accumulation of impurities in the air outlet cavity and enhancing the efficiency of fresh air replacement.

[0013] Optionally, a dual-output reducer is fixedly connected to one side of the rotating rod, a rotary air exchanger is rotatably connected in the shell, and one end of the rotary air exchanger is fixedly connected to the dual-output reducer, a rotating motor is fixedly connected in the shell, and the output shaft of the rotating motor is fixedly connected to the input end of the dual-output reducer.

[0014] Shaking the filter can help shake off dust and impurities attached to the filter, thereby maintaining the ventilation performance of the filter and improving the efficiency of air filtration. Shaking can also prevent impurities from long-term attachment to the filter and causing accumulation and blockage, thereby extending the service life of the filter.

[0015] Optionally, the shell is fixedly connected to a first fan near the first air outlet, and the first fan is used to drive fresh air in the air inlet chamber into the room. The shell is fixedly connected to a second fan near the second air outlet, and the second fan is used to drive the gas in the air outlet chamber to move out of the room.

[0016] Optionally, a silent filter for reducing noise is fixedly connected to the first air outlet and the second air inlet.

[0017] Optionally, a secondary filter is fixedly connected to the air inlet chamber, and the secondary filter is arranged on the side of the rotary air exchanger away from the filter. A secondary filter is fixedly connected to the air inlet chamber, and the secondary filter is arranged on the side of the secondary filter away from the rotary air exchanger.

[0018] The continuous rotation of the filter can maximize the air flow and avoid the decrease of air flow due to partial blockage of the filter. At the same time, regular reverse blowing can remove dust and dirt on the filter, thereby extending the service life of the filter.

[0019] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects: 1. The filter is penetrated through the air inlet cavity and the air outlet cavity so that each part of the filter can be evenly exposed to the air flow during the rotation process, thereby extending the service life of the filter. When the filter rotates to the air outlet cavity, it is blown by the exhaust air, which can help remove impurities on the filter to a certain extent and reduce the clogging of the filter.

[0020] 2. The abutment plate is used to reduce the impact force that may be generated by the filter during movement, prevent the filter from directly hitting the shell, thereby avoiding damage and reducing impact damage. The service life of the filter can be extended, reducing the frequency and cost of replacing the filter.

[0021] 3. Shaking the filter can help shake off the dust and impurities attached to the filter, thereby maintaining the ventilation performance of the filter and improving the efficiency of air filtration. Shaking can also prevent the accumulation and blockage caused by long-term attachment of impurities to the filter, thereby extending the service life of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a self-cleaning fresh air filtering device according to this embodiment; Figure 2 Schematic diagram of the structure inside the shell of this embodiment; Figure 3 This is a schematic diagram of the structure of the dual-output reducer and the rotary air exchanger of this embodiment; Figure 4 Schematic diagram of the structure of the filter screen in this embodiment; Figure 5 It is a schematic structural diagram of the abutment spring and the abutment plate of this embodiment; Figure 6 Schematic diagram of the structure of the rotating rod and the blocking plate of this embodiment.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. Shell; 11. Blocking plate; 12. Air outlet chamber; 13. Air inlet chamber; 14. First air inlet; 15. First air outlet; 16. Second air inlet; 17. Second air outlet; 2. Rotating rod; 21. Connecting block; 22. Filter; 23. Connecting rod; 3. Recovery device; 31. Lower fixing plate; 32. Upper fixing plate; 33. Connecting sleeve; 34. Dropping port; 4. Sealing baffle; 41. Connecting port; 42. Abutting spring; 43. Abutting plate; 5. Dual-output reducer; 51. Rotary air exchanger; 52. Rotating motor; 6. First fan; 61. Second fan; 7. Silent filter; 8. Intermediate filter; 81. Secondary filter. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 6 , the technical scheme of the embodiment of the present application is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0025] like Figure 1 and Figure 2 As shown, this embodiment provides a self-cleaning fresh air filtering device, including a shell 1, a transmission mechanism, a filtering mechanism, a buffer mechanism and a recovery device 3, a baffle plate 11 is fixedly connected to the shell 1, an air outlet cavity 12 is arranged above the baffle plate 11, an air inlet cavity 13 is arranged below the baffle plate 11, and a first air inlet 14 and a first air outlet 15 for allowing outdoor air to pass into the room are provided on the shell 1, the first air inlet 14 and the first air outlet 15 are arranged at the air inlet cavity 13 of the shell 1, and a baffle plate 11 is fixedly connected to the shell 1, an air outlet cavity 12 is arranged above the baffle plate 11, an air inlet cavity 13 is arranged below the baffle plate 11, and a first air inlet 14 and a first air outlet 15 are provided on the shell 1 for allowing indoor air to pass into the room. The second air inlet 16 and the second air outlet 17 are arranged in the air outlet chamber 12 of the shell 1, and the filter mechanism is driven to rotate by the transmission mechanism. The filter screen 22 arranged in the filter mechanism rotates under the drive of the transmission mechanism, so that the filter screen 22 filters the air in the air inlet chamber 13. When the filter screen 22 rotates to the air outlet chamber 12, impurities on the filter screen 22 are removed. The buffer mechanism is used to reduce the damage of the filter screen 22 during rotation. The recovery device 3 is used to recover impurities dropped from the filter screen 22.

[0026] like Figure 3 , Figure 4 and Figure 6 As shown, the transmission mechanism includes a rotating motor 52, a dual-output reducer 5, a rotating rod 2, a connecting block 21 and a connecting rod 23. The rotating motor 52 is fixedly connected to the inside of the housing 1, the input end of the dual-output reducer 5 is fixedly connected to the output end of the rotating motor 52, one of the output ends of the dual-output reducer 5 is fixedly connected to the rotating rod 2, the connecting block 21 is fixedly connected to the rotating rod 2, the connecting rod 23 is fixedly connected to the connecting block 21, and is arranged at one end of the connecting block 21 away from the rotating rod 2, and the connecting rod 23 is rotatably connected to the filter screen 22.

[0027] When it is necessary to drive the filter 22 to rotate, start the rotating motor 52, and the rotation of the output shaft of the rotating motor 52 is driven to the rotating rod 2 via the dual-output reducer 5, and drives the rotating rod 2 to rotate. The rotation of the rotating rod 2 drives the connecting rod 23 to rotate, and the connecting rod 23 drives the filter 22 to move, so that the filter 22 located on the side of the air inlet chamber 13 is moved to the side of the air outlet chamber 12, and the filter 22 located on the side of the air outlet chamber 12 is moved to the side of the air inlet chamber 13, so that part of the filter 22 is cleaned.

[0028] like Figure 3 As shown, a rotary air exchanger 51 is provided in the housing 1, and one end of the rotary air exchanger 51 is fixedly connected to one of the output ends of the dual-output reducer 5. The dual-output reducer 5 can drive the rotary air exchanger 51 to rotate to exchange air heat.

[0029] like Figure 2 As shown, the filtering mechanism also includes a medium filter 8 and a secondary filter 81. The medium filter 8 is fixedly connected in the shell 1 and arranged at the air inlet chamber 13. The medium filter 8 is arranged on the side of the rotary air exchanger 51 away from the filter 22. The secondary filter 81 is fixedly connected in the shell 1 and arranged at the air inlet chamber 13. The secondary filter 81 is arranged on the side of the medium filter 8 away from the rotary air exchanger 51.

[0030] like Figure 5 As shown, the buffer mechanism includes a sealing baffle 4, a connecting port 41, an abutting spring 42 and an abutting plate 43. The sealing baffle 4 is fixedly connected to the shell 1. The connecting port 41 is opened on the sealing baffle 4, and the filter screen 22 is sleeved in the connecting port 41. The connecting port 41 is set to be circular. The abutting spring 42 is fixedly connected to the sealing baffle 4 and is arranged at one end of the sealing baffle 4 close to the connecting port 41. The abutting springs 42 are distributed in a ring array on the sealing baffle 4. The abutting plate 43 is fixedly connected to the abutting spring 42 and is arranged on the side of the abutting spring 42 away from the sealing baffle 4.

[0031] like Figure 2 As shown, the shell 1 is fixedly connected to a first fan 6 near the first air outlet 15, and the first fan 6 is used to drive the fresh air in the air inlet chamber 13 into the room. The shell 1 is fixedly connected to a second fan 61 near the second air outlet 17, and the second fan 61 is used to drive the gas in the air outlet chamber 12 to move out of the room.

[0032] like Figure 1 and Figure 2 As shown, the recovery device 3 includes a lower fixed plate 31, an upper fixed plate 32, a connecting sleeve 33 and a blanking port 34. The lower fixed plate 31 is fixedly connected to the baffle plate 11 and is arranged on the side facing the air outlet chamber 12. The upper fixed plate 32 is fixedly connected to the inside of the shell 1 and is arranged on the side facing the baffle plate 11. The upper fixed plate 32 and the lower fixed plate 31 are staggered. The connecting sleeve 33 is fixedly connected to the inside of the shell 1 and is arranged in the air inlet chamber 13. A blanking port 34 is opened on the baffle plate 11. The blanking port 34 is arranged on both sides of the lower fixed plate 31. The connecting sleeve 33 and the blanking port 34 are connected.

[0033] like Figure 2 As shown, a silent filter 7 for reducing noise is fixedly connected to the first air outlet 15 and the second air inlet 16 .

[0034] When the present application is in use, when it is necessary to introduce fresh air into the room, the first fan 6 is started, and the first fan 6 drives the external fresh air located at the first air inlet 14 to enter the shell 1, and moves from the first air outlet 15 to the room after passing through the filter 22, the rotary air exchanger 51, the intermediate filter 8 and the secondary filter 81. When fresh air is introduced into the room, the second fan 61 is started, and the second fan 61 drives the internal air located at the second air inlet 16 to move into the shell 1, and moves toward the second air outlet 17 after passing through the rotary air exchanger 51 and the filter 22, thereby realizing the rotation of the indoor air.

[0035] When the air passes through the rotary air exchanger 51, the rotating motor 52 is started, and the output shaft of the rotating motor 52 drives the two output shafts of the dual-output reducer 5 to rotate, and drives the rotating rod 2 and the rotary air exchanger 51 to rotate, so that the temperature of the indoor air is exchanged with the temperature of the outside air, and in the process of rotation of the rotating rod 2, the rotating rod 2 drives the connecting block 21 to rotate, and the connecting block 21 drives the connecting rod 23 to rotate, and the rotation of the connecting rod 23 drives the filter 22 to rotate, so that the filter 22 rotates from one side of the air inlet chamber 13 toward one side of the air outlet chamber 12, and the filter 22 rotates from one side of the air outlet chamber 12 toward one side of the air inlet chamber 13. When the filtered filter 22 moves from the air inlet chamber 13 to the air outlet chamber 12, the second fan 61 drives the indoor air to blow toward the filter 22, so that the impurities on the filter 22 are blown off, thereby cleaning the filter 22.

[0036] During the rotation of the filter 22, since the connecting rod 23 and the rotating rod 2 are not concentric, the filter 22 will shake to a certain extent toward the connecting port 41 during the rotation to reduce impurities that may remain on the filter 22. During the shaking of the filter 22, the damage to the filter 22 is reduced due to the setting of the abutment plate 43 and the abutment spring 42.

[0037] When impurities on the filter 22 are blown off by the indoor air, the impurities move from the upper fixed plate 32 close to the filter 22 toward the lower fixed plate 31, and move from the lower fixed plate 31 toward the upper fixed plate 32 away from the filter 22. When the impurities move to the drop port 34, since the weight of the impurities is greater than the weight of the air, the impurities will move from the drop port 34 to the connecting sleeve 33, thereby collecting the impurities.

[0038] In this embodiment, the filter 22 is arranged to penetrate the air inlet chamber 13 and the air outlet chamber 12, so that each part of the filter 22 can be evenly exposed to the air flow during the rotation process, thereby extending the service life of the filter 22. When the filter 22 rotates to the air outlet chamber 12, it is blown by the exhaust air, which can help remove impurities on the filter 22 to a certain extent and reduce the blockage of the filter 22.

[0039] In this embodiment, the filter 22 rotates continuously to maximize the air flow and avoid a decrease in air flow due to partial blockage of the filter 22. At the same time, dust and dirt on the filter 22 can be removed by regular reverse blowing, thereby extending the service life of the filter 22.

[0040] In this embodiment, shaking the filter 22 helps to shake off dust and impurities attached to the filter, thereby maintaining the ventilation performance of the filter 22 and improving the efficiency of air filtration. Shaking can also prevent accumulation and blockage caused by long-term attachment of impurities to the filter 22, thereby extending the service life of the filter 22.

[0041] In this embodiment, the abutment plate 43 is used to reduce the impact force that may be generated by the filter screen 22 during movement, preventing the filter screen 22 from directly hitting the shell 1, thereby avoiding damage and reducing impact damage. The service life of the filter screen 22 can be extended, reducing the frequency and cost of replacing the filter screen 22.

[0042] The implementation principle of a self-cleaning fresh air filtering device in the embodiment of the present application is as follows: when fresh air needs to be introduced into the room, the first fan 6 is started, and the first fan 6 drives the external fresh air located at the first air inlet 14 to enter the shell 1, and moves from the first air outlet 15 to the room after passing through the filter 22, the rotary air exchanger 51, the intermediate filter 8 and the secondary filter 81. When fresh air is introduced into the room, the second fan 61 is started, and the second fan 61 drives the internal air located at the second air inlet 16 to move into the shell 1, and moves toward the second air outlet 17 after passing through the rotary air exchanger 51 and the filter 22, thereby realizing the rotation of the indoor air.

[0043] When the air passes through the rotary air exchanger 51, the rotating motor 52 is started, and the output shaft of the rotating motor 52 drives the two output shafts of the dual-output reducer 5 to rotate, and drives the rotating rod 2 and the rotary air exchanger 51 to rotate, so that the temperature of the indoor air is exchanged with the temperature of the outside air, and in the process of rotation of the rotating rod 2, the rotating rod 2 drives the connecting block 21 to rotate, and the connecting block 21 drives the connecting rod 23 to rotate, and the rotation of the connecting rod 23 drives the filter 22 to rotate, so that the filter 22 rotates from one side of the air inlet chamber 13 toward one side of the air outlet chamber 12, and the filter 22 rotates from one side of the air outlet chamber 12 toward one side of the air inlet chamber 13. When the filtered filter 22 moves from the air inlet chamber 13 to the air outlet chamber 12, the second fan 61 drives the indoor air to blow toward the filter 22, so that the impurities on the filter 22 are blown off, thereby cleaning the filter 22.

[0044] During the rotation of the filter 22, since the connecting rod 23 and the rotating rod 2 are not concentric, the filter 22 will shake to a certain extent toward the connecting port 41 during the rotation to reduce impurities that may remain on the filter 22. During the shaking of the filter 22, the damage to the filter 22 is reduced due to the setting of the abutment plate 43 and the abutment spring 42.

[0045] When impurities on the filter 22 are blown off by the indoor air, the impurities move from the upper fixed plate 32 close to the filter 22 toward the lower fixed plate 31, and move from the lower fixed plate 31 toward the upper fixed plate 32 away from the filter 22. When the impurities move to the drop port 34, since the weight of the impurities is greater than the weight of the air, the impurities will move from the drop port 34 to the connecting sleeve 33, thereby collecting the impurities.

[0046] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A self-cleaning fresh air filtering device, comprising a housing (1), a baffle plate (11) fixedly connected to the housing (1), an air outlet cavity (12) being arranged above the baffle plate (11), and an air inlet cavity (13) being arranged below the baffle plate (11), characterized in that: The shell (1) is provided with a first air inlet (14) and a first air outlet (15) for allowing external air to flow into the room, and the shell (1) is provided with a second air inlet (16) and a second air outlet (17) for allowing internal air to flow into the room. The baffle plate (11) is rotatably connected to a rotating rod (2), the rotating rod (2) is fixedly connected to a connecting block (21), a side of the connecting block (21) away from the rotating rod (2) is fixedly connected to a connecting rod (23), a filter screen (22) is rotatably connected to the connecting rod (23), the filter screen (22) is arranged to penetrate the baffle plate (11), one end of the filter screen (22) is arranged in the air inlet cavity (13), and a side of the filter screen (22) away from the air inlet cavity (13) is arranged in the air outlet cavity (12), and a recovery device (3) for collecting impurities on the filter screen (22) is arranged in the air outlet cavity (12), and a recovery device (3) for collecting impurities on the filter screen (22) is arranged in the air outlet cavity (12).

2. A self-cleaning fresh air filter device according to claim 1, characterized in that: A sealing baffle (4) is fixedly connected to the housing (1), a connecting port (41) is provided on the sealing baffle (4), the filter screen (22) is sleeved in the connecting port (41), the connecting port (41) is arranged in a circular shape, abutment springs (42) are fixedly connected to a side of the sealing baffle (4) close to the connecting port (41), the abutment springs (42) are distributed in an annular array on the sealing baffle (4), and abutment plates (43) capable of abutting against a side wall of the filter screen (22) are fixedly connected to a side of the abutment springs (42) away from the sealing baffle (4).

3. A self-cleaning fresh air filter device according to claim 1, characterized in that: The recovery device (3) comprises a lower fixing plate (31) fixedly connected to the baffle plate (11) and arranged on a side facing the air outlet cavity (12); an upper fixing plate (32) is fixedly connected to the shell (1), the upper fixing plate (32) is arranged facing the baffle plate (11), and the upper fixing plate (32) and the lower fixing plate (31) are arranged in a staggered manner.

4. A self-cleaning fresh air filter device according to claim 3, characterized in that: A connecting sleeve (33) is fixedly connected to the air inlet chamber (13), a material drop opening (34) is provided on the baffle plate (11), and the material drop opening (34) is arranged on the left and right sides of the lower fixed plate (31), and one end of the connecting sleeve (33) is in communication with the material drop opening (34).

5. The self-cleaning fresh air filtering device according to claim 1, characterized in that: A dual-output reducer (5) is fixedly connected to one side of the rotating rod (2); a rotary air exchanger (51) is rotatably connected to the housing (1); one end of the rotary air exchanger (51) is fixedly connected to the dual-output reducer (5); a rotary motor (52) is fixedly connected to the housing (1); and an output shaft of the rotary motor (52) is fixedly connected to an input end of the dual-output reducer (5).

6. A self-cleaning fresh air filter device according to claim 1, characterized in that: The shell (1) is fixedly connected to a first fan (6) near the first air outlet (15), and the first fan (6) is used to drive fresh air in the air inlet chamber (13) into the room. The shell (1) is fixedly connected to a second fan (61) near the second air outlet (17), and the second fan (61) is used to drive the gas in the air outlet chamber (12) to move out of the room.

7. The self-cleaning fresh air filtering device according to claim 1, characterized in that: The first air outlet (15) and the second air inlet (16) are both fixedly connected with a silent filter (7) for reducing noise.

8. The self-cleaning fresh air filtering device according to claim 5, characterized in that: A secondary filter (8) is fixedly connected to the air inlet cavity (13), and the secondary filter (8) is arranged on a side of the rotary air exchanger (51) away from the filter (22); a secondary filter (81) is fixedly connected to the air inlet cavity (13), and the secondary filter (81) is arranged on a side of the secondary filter (8) away from the rotary air exchanger (51).

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