Air supply and exhaust efficient filtering device for clean laboratory

Abstract

The invention provides a clean laboratory air supply and exhaust efficient filtering device, and relates to the technical field of air filtering. The air supply and exhaust efficient filtering device for the clean laboratory comprises an air pipe with an air duct, and a first air opening and a second air opening are formed in the two ends of the air duct respectively; the fan is connected to the first air opening; the filtering mechanism comprises a first filtering net, an activated carbon filtering net and a second filtering net which are arranged in the air pipe, the first filtering net is arranged close to the first air opening, the second filtering net is arranged close to the second air opening, and the activated carbon filtering net is arranged between the first filtering net and the second filtering net. When air in the laboratory is discharged out of the room, the first filter screen does not participate in the filtering process, so that the subsequent filtering effect of the first filter screen is improved, the service life of the first filter screen is prolonged, and when outdoor air is fed into the laboratory, the activated carbon filter screen does not participate in the filtering process, so that the service life of the activated carbon filter screen is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of air filtration, and in particular to a high-efficiency filtering device for supply and exhaust air in a clean laboratory. Background Art

[0002] In the construction and operation of clean laboratories, the design and implementation of air supply and exhaust systems are crucial. Traditional clean laboratory air supply and exhaust systems usually include fixed filtering devices to filter dust and harmful gases in the air to ensure that the air quality in the laboratory meets specific standards.

[0003] In most traditional air supply and exhaust systems, filters and other filtering devices are usually fixed in the air duct. Due to the different air quality indoors and outdoors, fixed filters and other filtering devices cannot automatically adjust according to changes in air quality, resulting in the inability to filter in the most optimized manner under different air quality conditions. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a high-efficiency filtering device for supply and exhaust air in a clean laboratory.

[0005] The present invention provides a clean laboratory air supply and exhaust high efficiency filtering device, comprising: The air duct has an air duct, and two ends of the air duct are respectively set as a first air outlet and a second air outlet; A fan connected to the first air outlet; A filtering mechanism, comprising a first filter screen, an activated carbon filter screen and a second filter screen arranged in the air duct, wherein the first filter screen is arranged near the first air outlet, the second filter screen is arranged near the second air outlet, and the activated carbon filter screen is arranged between the first filter screen and the second filter screen; and A rotating member is arranged in the air duct, wherein when the fan is not working or when the fan is working to make the wind flow from the second air outlet to the first air outlet, the first filter is located outside the air duct, and the activated carbon filter and the second filter are located in the air duct; when the fan is working to make the wind flow from the first air outlet to the second air outlet, the rotating member is rotated by the wind, so that the first filter moves into the air duct and the activated carbon filter moves out of the air duct.

[0006] Optionally, the air duct also includes a lower tube chamber and an upper tube chamber, the mass of the activated carbon filter is greater than the mass of the first filter, the first filter and the activated carbon filter are used to move from the upper tube chamber into the air duct in a vertical direction, the rotating member includes a wind shield, a rotating shaft and an arc-shaped wind guide plate, the lower tube chamber is provided with a cylindrical cavity and an air guide slope, the rotating shaft is rotatably connected to the center of the cylindrical cavity, the air guide slope is close to the position of the fan, one end of the wind shield is in sliding contact with the inner wall of the cylindrical cavity, the other end of the wind shield is connected to the arc-shaped wind guide plate, and the connection between the wind shield and the arc-shaped wind guide plate is rotatably connected to the inner wall of the cylindrical cavity through the rotating shaft, the mass of the arc-shaped wind guide plate is greater than the mass of the wind shield, and the arc surface of the arc-shaped wind guide plate is in sliding contact with the inner wall of the cylindrical cavity.

[0007] Optionally, a groove is provided on the arc surface of the arc-shaped air guide plate.

[0008] Optionally, a driving mechanism is provided in the air duct, and the driving mechanism is connected to the rotating member. When the rotating member is rotated by wind, the first filter moves from the upper tube chamber into the air duct, and the activated carbon filter moves from the air duct into the upper tube chamber.

[0009] Optionally, the driving mechanism includes a first pull wire, a first lifting wire, a second lifting wire, a fixed pulley and a first guide wire pulley, one end of the first pull wire is connected to an end of the wind shield away from the arc-shaped wind guide plate, the other end of the first pull wire is connected to the bottom end of the first filter net, the top of the first filter net is connected to one end of the first lifting wire, the other end of the first lifting wire is connected to the second lifting wire after bypassing the fixed pulley, the second lifting wire is connected to the top of the activated carbon filter, and the fixed pulley is rotatably connected to the inner wall of the upper tube chamber.

[0010] Optionally, the driving mechanism further includes a first wire wheel and a second wire wheel, the first wire wheel and the second wire wheel are rotatably connected to the inner wall of the air duct, and the first wire wheel and the second wire wheel are used to contact the first pull wire.

[0011] Optionally, the clean laboratory air supply and exhaust high efficiency filtering device further comprises a cleaning mechanism, wherein the cleaning mechanism is disposed in the upper tube chamber, and when the first filter net moves vertically, the cleaning mechanism is used to clean the first filter net.

[0012] Optionally, the cleaning mechanism includes a shell and a soft brush, the shell is connected to the inner side wall and the inner bottom wall of the upper tube chamber, the soft brush is connected to the shell, and the bristles of the soft brush are in contact with the first filter.

[0013] Optionally, the clean laboratory supply and exhaust air high-efficiency filtration device also includes a soot blowing mechanism, and a soot cleaning port is provided at the lower edge of the inner wall of the upper tube chamber. When the activated carbon filter moves vertically downward, the soot blowing mechanism is used to blow out the dust and dirt in the shell from the soot cleaning port.

[0014] Optionally, the soot blowing mechanism includes a cylinder, a spring, a second pull wire, a winding wheel, a gear, a piston and a rack. The cylinder is connected to the inner bottom of the upper tube chamber, and an air outlet and an air inlet are respectively provided at both ends of the cylinder. The air outlet is communicated with the shell, and the piston is slidably connected in the cylinder. One end of the spring is connected to the piston, and the other end of the spring is connected to the inner wall of the cylinder away from the shell. The gear is rotatably connected to the end of the cylinder away from the shell through a pin shaft, and the winding wheel is mounted on the pin shaft. One end of the second pull wire is connected to the piston, and the other end of the second pull wire is wound around the winding wheel. The rack is connected to the activated carbon filter, and the rack is used to mesh with the gear.

[0015] The beneficial effect of the clean laboratory air supply and exhaust high-efficiency filtering device of the present invention is as follows: by arranging a rotating part in the air duct, when the air in the laboratory needs to be discharged outdoors, since there is less dust in the air in the laboratory, the first filter is located outside the air duct, so that the first filter does not participate in the filtering process, so as to improve the subsequent filtering effect of the first filter and improve the service life of the first filter, while the activated carbon filter and the second filter are located in the air duct, the air in the laboratory first passes through the second filter from the second air outlet to filter the dust, and then passes through the activated carbon filter to filter the harmful gas and then is discharged from the first air outlet, when it is necessary to send the outdoor air into the laboratory, although there is more dust in the outdoor air, there is almost no harmful gas, at this time, when the fan works to make the wind flow from the first air outlet to the second air outlet, the rotating part can be rotated by the wind, thereby driving the first filter to move into the air duct, and the activated carbon filter to move out of the air duct, so that the activated carbon filter does not participate in the filtering process, so as to improve the service life of the activated carbon filter, and the outdoor air is intercepted twice by the first filter and the second filter, thereby improving the air quality sent into the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a high-efficiency filtration device for supplying and exhausting air in a clean laboratory according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the clean laboratory air supply and exhaust high efficiency filtering device during exhausting according to an embodiment of the present invention; Figure 3 It is a schematic diagram of a soot blowing mechanism of a clean laboratory air supply and exhaust high efficiency filtering device during exhausting of an embodiment of the present invention; Figure 4This is a schematic diagram of the air supply and exhaust high-efficiency filtering device for clean laboratories in the air supply process according to an embodiment of the present invention; Figure 5 for Figure 4 A magnified view of the structure at A; Figure 6 This is a schematic diagram of the clean laboratory air supply and exhaust high efficiency filtration device during air supply according to an embodiment of the present invention; Figure 7 The diagram is a schematic diagram of the dust blowing mechanism of the clean laboratory air supply and exhaust high efficiency filtering device during air supply in an embodiment of the present invention.

[0017] Explanation of reference numerals: 1, air duct; 11, first air outlet; 12, second air outlet; 13, lower tube chamber; 131, cylindrical cavity; 132, wind guide slope; 14, upper tube chamber; 141, ash cleaning port; 2, fan; 3, rotating part; 31, wind shield; 32, rotating shaft; 33, arc-shaped air guide plate; 331, groove; 4, driving mechanism; 41, first pull wire; 42, first lifting wire; 43, second lifting wire ; 44. Fixed pulley; 45. First wire pulley; 46. Second wire pulley; 5. Soot blowing mechanism; 51. Cylinder; 511. Air outlet; 512. Air inlet; 52. Spring; 53. Second pull wire; 54. Winding wheel; 55. Gear; 56. Piston; 57. Rack; 6. Cleaning mechanism; 61. Shell; 62. Soft brush; 7. First filter; 8. Activated carbon filter; 9. Second filter. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] In the description of the present invention, it should be noted that, 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or embodiments in a suitable manner.

[0021] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0022] The Z axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis represents the up, and the negative direction of the Z axis represents the down; the X axis in the accompanying drawings represents the horizontal direction, and is designated as the left and right positions, and the positive direction of the X axis represents the left side, and the negative direction of the X axis represents the right side; the Y axis in the accompanying drawings represents the front and back positions, and the positive direction of the Y axis represents the front side, and the negative direction of the Y axis represents the back side. It should also be noted that the aforementioned Z axis, Y axis, and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] The embodiment of the present invention provides a high-efficiency filtering device for supplying and exhausting air in a clean laboratory, comprising: an air duct 1, having an air duct, wherein two ends of the air duct are respectively set as a first air outlet 11 and a second air outlet 12; a fan 2, connected to the first air outlet 11; a filtering mechanism, comprising a first filter screen 7, an activated carbon filter screen 8 and a second filter screen 9 arranged in the air duct 1, the first filter screen 7 is arranged close to the first air outlet 11, the second filter screen 9 is arranged close to the second air outlet 12, and the activated carbon filter screen 8 is arranged between the first filter screen 7 and the second filter screen 9; and a rotating member 3, arranged in the air duct 1, wherein when the fan 2 is not working or the fan 2 is working to make the wind flow from the second air outlet 12 to the first air outlet 11, the first filter screen 7 is located outside the air duct, and the activated carbon filter screen 8 and the second filter screen 9 are located in the air duct, and when the fan 2 is working to make the wind flow from the first air outlet 11 to the second air outlet 12, the rotating member 3 is blown by the wind and rotates, so that the first filter screen 7 moves into the air duct and the activated carbon filter screen 8 moves out of the air duct.

[0024] Specifically, combined Figure 1 , Figure 2 and Figure 6 As shown, the first air outlet 11 is the rear end of the air duct 1 (the negative direction of the Y axis in the figure), located outdoors, and the second air outlet 12 is the front end of the air duct 1 (the positive direction of the Y axis in the figure), located in the laboratory. The air duct is the channel through which the wind flows in the air duct 1.

[0025] In this optional embodiment, by setting a rotating part 3 in the air duct 1, when the air in the laboratory needs to be discharged outdoors, since there is less dust in the air in the laboratory, the first filter 7 is located outside the air duct, so that the first filter 7 does not participate in the filtering process, so as to improve the subsequent filtering effect of the first filter 7 and increase the service life of the first filter 7, while the activated carbon filter 8 and the second filter 9 are located in the air duct. The air in the laboratory first passes through the second filter 9 from the second air outlet 12 to filter the dust, and then passes through the activated carbon filter 8 to filter the harmful gas. After that, it is discharged from the first air outlet 11. When it is necessary to send outdoor air into the laboratory, although there is a lot of dust in the outdoor air, there is almost no harmful gas. At this time, when the fan 2 works to make the wind flow from the first air outlet 11 to the second air outlet 12, the rotating part 3 can be blown by the wind and rotate, thereby driving the first filter 7 to move into the air duct and the activated carbon filter 8 to move out of the air duct, so that the activated carbon filter 8 does not participate in the filtering process, so as to increase the service life of the activated carbon filter 8, and the first filter 7 and the second filter 9 are used to intercept the outdoor air for two times, thereby improving the air quality sent to the laboratory.

[0026] Furthermore, the air duct 1 also includes a lower tube chamber 13 and an upper tube chamber 14, the mass of the activated carbon filter 8 is greater than the mass of the first filter 7, the first filter 7 and the activated carbon filter 8 are used to move into the air duct from the upper tube chamber 14 in the vertical direction, the rotating member 3 includes a wind shield 31, a rotating shaft 32 and an arc-shaped wind guide plate 33, the lower tube chamber 13 is provided with a cylindrical cavity 131 and an air guide inclined surface 132, the rotating shaft 32 is rotatably connected to the center of the cylindrical cavity 131, and the air guide inclined surface 132 is close to the position of the fan 2 , so that the wind can flow to the gap of the cylindrical cavity 131 through the wind guide slope 132, one end of the wind shield 31 is in sliding contact with the inner wall of the cylindrical cavity 131, and the other end of the wind shield 31 is connected to the arc-shaped wind guide plate 33, and the connection between the wind shield 31 and the arc-shaped wind guide plate 33 is rotatably connected to the inner wall of the cylindrical cavity 131 through the rotating shaft 32, the mass of the arc-shaped wind guide plate 33 is greater than the mass of the wind shield 31, and the arc surface of the arc-shaped wind guide plate 33 is in sliding contact with the inner wall of the cylindrical cavity 131.

[0027] Optionally, a groove 331 is provided on the arc surface of the arc-shaped air guide plate 33 .

[0028] In this optional embodiment, combined with Figure 6 As shown, the wind can blow toward the groove 331 on the arc surface of the arc-shaped wind guide plate 33, thereby increasing the thrust of the wind on the arc-shaped wind guide plate 33, thereby maintaining the position of the arc-shaped wind guide plate 33 and improving the stability of the positions of the first filter screen 7 and the activated carbon filter screen 8.

[0029] Furthermore, a driving mechanism 4 is provided in the air duct 1, and the driving mechanism 4 is connected to the rotating member 3. When the rotating member 3 is rotated by the wind, the first filter screen 7 moves from the upper tube chamber 14 into the air duct, and the activated carbon filter screen 8 moves from the air duct into the upper tube chamber 14.

[0030] Optionally, the driving mechanism 4 includes a first pull wire 41, a first lifting wire 42, a second lifting wire 43, a fixed pulley 44 and a first guide wire 45, one end of the first pull wire 41 is connected to one end of the wind shield 31 away from the arc-shaped wind guide plate 33, the other end of the first pull wire 41 is connected to the bottom end of the first filter screen 7, the top of the first filter screen 7 is connected to one end of the first lifting wire 42, the other end of the first lifting wire 42 is connected to the second lifting wire 43 after passing around the fixed pulley 44, the second lifting wire 43 is connected to the top of the activated carbon filter screen 8, and the fixed pulley 44 is rotatably connected to the inner wall of the upper tube chamber 14.

[0031] In this optional embodiment, combined with Figure 2 As shown, at this time, when the fan 2 is not working, or when the fan 2 is working to make the wind flow from the second air outlet 12 to the first air outlet 11, that is, when the air in the laboratory is discharged to the outside, the wind cannot exert a force on the wind shield 31, and because the mass of the arc-shaped wind guide plate 33 is greater than the mass of the wind shield 31, the mass of the activated carbon filter 8 is greater than the mass of the first filter 7, the activated carbon filter 8 is located in the air duct, and the first filter 7 is located in the upper tube chamber 14, combined with Figure 4 and Figure 5 As shown, when it is necessary to supply air from the outside to the laboratory, the wind can apply thrust to the wind shield 31 through the gap of the columnar cavity 131, causing the wind shield 31 to rotate clockwise, thereby pulling down the first filter screen 7 through the first pull wire 41, and then raising the activated carbon filter screen 8 through the fixed pulley 44 until the arc surface of the arc-shaped air guide plate 33 covers the gap of the columnar cavity 131, thereby achieving the goal of moving the first filter screen 7 out of the air duct and moving the activated carbon filter screen 8 into the air duct.

[0032] Furthermore, the driving mechanism 4 further includes a first wire wheel 45 and a second wire wheel 46 , which are rotatably connected to the inner wall of the air duct 1 , and are used to contact the first pull wire 41 .

[0033] In this optional embodiment, combined with Figure 4 and Figure 5 As shown, the first wire wheel 45 and the second wire wheel 46 can be rotatably connected to the corresponding positions of the inner wall of the air duct 1 through a wheel seat. When the first pull wire 41 moves, it can roll in contact with the first wire wheel 45 and the second wire wheel 46, thereby reducing the resistance of the first pull wire 41 and improving the smoothness of the first pull wire 41 when moving.

[0034] Optionally, a cleaning mechanism 6 is further included. The cleaning mechanism 6 is disposed in the upper tube chamber 14 . When the first filter screen 7 moves vertically, the cleaning mechanism 6 is used to clean the first filter screen 7 .

[0035] Furthermore, the cleaning mechanism 6 includes a shell 61 and a soft brush 62 . The shell 61 is connected to the inner side wall and the inner bottom wall of the upper tube chamber 14 . The soft brush 62 is connected to the shell 61 . The bristles of the soft brush 62 are in contact with the first filter 7 .

[0036] In this optional embodiment, combined with Figure 3 and Figure 6 As shown, no matter whether the first filter 7 moves vertically upward (along the positive direction of the Z axis) or vertically downward (along the negative direction of the Z axis), the bristles of the soft brush 62 can sweep the filter holes of the first filter 7, thereby sweeping away the dust and dirt trapped on the first filter 7, thereby achieving a self-cleaning effect for the first filter 7.

[0037] Optionally, a soot blowing mechanism 5 is further included. A soot cleaning port 141 is provided at the lower edge of the inner wall of the upper tube chamber 14 . When the activated carbon filter 8 moves vertically downward, the soot blowing mechanism 5 is used to blow out the soot in the shell 61 from the soot cleaning port 141 .

[0038] Furthermore, the sootblowing mechanism 5 includes a cylinder 51, a spring 52, a second pull wire 53, a winding wheel 54, a gear 55, a piston 56 and a rack 57. The cylinder 51 is connected to the inner bottom of the upper tube chamber 14. The two ends of the cylinder 51 are respectively provided with an air outlet 511 and an air inlet 512. The air outlet 511 is communicated with the shell 61. The piston 56 is slidably connected in the cylinder 51. One end of the spring 52 is connected to the piston 56, and the other end of the spring 52 is connected to the inner wall of the cylinder 51 away from the shell 61. The gear 55 is rotatably connected to the end of the cylinder 51 away from the shell 61 through a pin shaft. The winding wheel 54 is mounted on the pin shaft. One end of the second pull wire 53 is connected to the piston 56, and the other end of the second pull wire 53 is wound around the winding wheel 54. The rack 57 is connected to the activated carbon filter 8, and the rack 57 is used to mesh with the gear 55.

[0039] In this optional embodiment, combined with Figure 4 , Figure 6 and Figure 7As shown, the fan 2 is in working state, causing wind to flow from the first air outlet 11 to the second air outlet 12, so that outdoor air is sent into the laboratory through the first air outlet 11 and the second air outlet 12 in turn. At this time, the first filter screen 7 moves vertically downward, and the activated carbon filter screen 8 and the rack 57 move vertically upward together, so that the rack 57 is meshed with the gear 55, and then the activated carbon filter screen 8 and the rack 57 continue to move upward, thereby driving the gear 55 to rotate to drive the pin shaft to rotate counterclockwise, and then drive the winding wheel 54 to rotate, so that one end of the second pull wire 53 is wound on the winding wheel 54, and the other end of the second pull wire 53 pulls the piston 56 to move to the front end of the cylinder 51 (the end of the cylinder 51 in the positive direction of the Y axis), so that the spring 52 is in a compressed state, combined with Figure 2 and Figure 3 As shown, when it is not necessary to supply air to the laboratory, the fan 2 is turned off, or when it is necessary to exhaust air to the outside, the wind direction of the fan 2 is changed so that the wind flows from the second air outlet 12 to the first air outlet 11, and the air in the laboratory is discharged to the outside through the second air outlet 12 and the first air outlet 11 in turn. At this time, the activated carbon filter 8 moves vertically downward together with the rack 57, and drives the pin shaft to rotate clockwise by driving the gear 55 to rotate, so that the winding wheel 54 releases the second pull wire 53, so that the second pull wire 53 releases the pulling force on the piston 56, and the spring 52 returns to the natural state to push the piston 56 to move toward the front end of the cylinder 51, so that the cylinder 5 1 is blown into the shell body 61 through the air outlet 511, and the dust and dirt at the bottom of the shell body 61 are blown out from the cleaning port 141. It should be noted that since the first filter screen 7 is used for filtering outdoor air, it retains much more dust and dirt than the second filter screen 9. By timely blowing out the dust and dirt at the bottom of the shell body 61 from the cleaning port 141, the effect of automatic cleaning is achieved. It should be noted that since the second filter screen 9 has a smaller dust interception capacity than the first filter screen 7, the second filter screen 9 can be fixed inside the air duct 1 by a detachable connection, and the second filter screen 9 can be removed and cleaned or replaced regularly.

[0040] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A clean laboratory air supply and exhaust high efficiency filtration device, characterized in that: include: An air duct (1) having an air duct, wherein two ends of the air duct are respectively provided as a first air outlet (11) and a second air outlet (12); A fan (2) connected to the first air outlet (11); A filtering mechanism, comprising a first filter screen (7), an activated carbon filter screen (8) and a second filter screen (9) arranged in the air duct (1), the first filter screen (7) being arranged close to the first air outlet (11), the second filter screen (9) being arranged close to the second air outlet (12), and the activated carbon filter screen (8) being arranged between the first filter screen (7) and the second filter screen (9); and A rotating member (3) is arranged in the air duct (1), wherein when the fan (2) is not working or when the fan (2) is working so that wind flows from the second air outlet (12) to the first air outlet (11), the first filter (7) is located outside the air duct, and the activated carbon filter (8) and the second filter (9) are located inside the air duct; when the fan (2) is working so that wind flows from the first air outlet (11) to the second air outlet (12), the rotating member (3) is rotated by the wind, so that the first filter (7) moves into the air duct and the activated carbon filter (8) moves out of the air duct.

2. The clean laboratory air supply and exhaust high efficiency filtration device according to claim 1, characterized in that: The air duct (1) further comprises a lower tube chamber (13) and an upper tube chamber (14); the mass of the activated carbon filter (8) is greater than the mass of the first filter (7); the first filter (7) and the activated carbon filter (8) are used to move from the upper tube chamber (14) into the air duct along a vertical direction; the rotating member (3) comprises a wind shield (31), a rotating shaft (32) and an arc-shaped wind guide plate (33); the lower tube chamber (13) is provided with a columnar cavity (131) and a wind guide inclined surface (132); the rotating shaft (32) is rotatably connected to the center of the columnar cavity (131); the wind guide The inclined surface (132) is close to the position of the fan (2), one end of the wind shield (31) is in sliding contact with the inner wall of the columnar cavity (131), the other end of the wind shield (31) is connected to the arc-shaped wind guide plate (33), and the connection between the wind shield (31) and the arc-shaped wind guide plate (33) is rotatably connected to the inner wall of the columnar cavity (131) via the rotating shaft (32), the mass of the arc-shaped wind guide plate (33) is greater than the mass of the wind shield (31), and the arc surface of the arc-shaped wind guide plate (33) is in sliding contact with the inner wall of the columnar cavity (131).

3. The clean laboratory air supply and exhaust high efficiency filtration device as claimed in claim 2, characterized in that: The arc surface of the arc-shaped air guide plate (33) is provided with a groove (331).

4. The clean laboratory air supply and exhaust high efficiency filtration device as claimed in claim 2, characterized in that: A driving mechanism (4) is provided in the air duct (1), and the driving mechanism (4) is connected to the rotating member (3) for driving. When the rotating member (3) is rotated by wind, the first filter screen (7) moves from the upper tube chamber (14) into the air duct, and the activated carbon filter screen (8) moves from the air duct into the upper tube chamber (14).

5. The clean laboratory air supply and exhaust high efficiency filtration device as claimed in claim 4, characterized in that: The driving mechanism (4) comprises a first pulling wire (41), a first lifting wire (42), a second lifting wire (43), a fixed pulley (44) and a first guide wheel (45); one end of the first pulling wire (41) is connected to an end of the wind shield (31) away from the arc-shaped wind guide plate (33); the other end of the first pulling wire (41) is connected to the bottom end of the first filter screen (7); the top end of the first filter screen (7) is connected to one end of the first lifting wire (42); the other end of the first lifting wire (42) is connected to the second lifting wire (43) after passing through the fixed pulley (44); the second lifting wire (43) is connected to the top end of the activated carbon filter screen (8); and the fixed pulley (44) is rotatably connected to the inner wall of the upper tube chamber (14).

6. The clean laboratory air supply and exhaust high efficiency filtration device as claimed in claim 5, characterized in that: The driving mechanism (4) further comprises a first wire wheel (45) and a second wire wheel (46), wherein the first wire wheel (45) and the second wire wheel (46) are rotatably connected to the inner wall of the air duct (1), and the first wire wheel (45) and the second wire wheel (46) are used to contact the first pull wire (41).

7. The clean laboratory air supply and exhaust high efficiency filtration device as claimed in claim 2, characterized in that: It also comprises a cleaning mechanism (6), wherein the cleaning mechanism (6) is arranged in the upper tube chamber (14), and when the first filter screen (7) moves vertically, the cleaning mechanism (6) is used to clean the first filter screen (7).

8. The clean laboratory air supply and exhaust high efficiency filtration device as claimed in claim 7, characterized in that: The cleaning mechanism (6) comprises a shell (61) and a soft brush (62); the shell (61) is connected to the inner side wall and the inner bottom wall of the upper tube chamber (14); the soft brush (62) is connected to the shell (61); and the bristles of the soft brush (62) are in contact with the first filter screen (7).

9. The clean laboratory air supply and exhaust high efficiency filtration device as claimed in claim 8, characterized in that: It also includes a soot blowing mechanism (5), wherein a soot cleaning port (141) is provided at the lower edge of the inner wall of the upper tube chamber (14), and when the activated carbon filter (8) moves vertically downward, the soot blowing mechanism (5) is used to blow out soot and dirt in the shell (61) from the soot cleaning port (141).

10. The clean laboratory air supply and exhaust high efficiency filtration device according to claim 9, characterized in that: The soot blowing mechanism (5) comprises a cylinder (51), a spring (52), a second pull wire (53), a winding wheel (54), a gear (55), a piston (56) and a rack (57); the cylinder (51) is connected to the inner bottom of the upper tube chamber (14); two ends of the cylinder (51) are respectively provided with an air outlet (511) and an air inlet (512); the air outlet (511) is communicated with the shell (61); the piston (56) is slidably connected to the cylinder (51); one end of the spring (52) is connected to the piston (56); The other end of the spring (52) is connected to the inner wall of one end of the cylinder (51) away from the shell (61), the gear (55) is rotatably connected to the end of the cylinder (51) away from the shell (61) through a pin shaft, the winding wheel (54) is sleeved on the pin shaft, one end of the second pull wire (53) is connected to the piston (56), the other end of the second pull wire (53) is wound around the winding wheel (54), the rack (57) is connected to the activated carbon filter (8), and the rack (57) is used to mesh with the gear (55).

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