A new fan

Abstract

The application discloses a new fan, which comprises a casing, an air inlet arranged on one side of the casing, and an air outlet arranged on the other side of the casing; a filtering mechanism, which comprises a filtering frame, an unwinding roller, a winding roller, a guide roller and a winding motor; the filtering frame is connected to the casing; a filtering channel is formed in the filtering frame and is opposite to the air inlet; the unwinding roller and the winding roller are respectively rotatably connected to the casing and are located above the filtering frame; the unwinding roller is located on the side far away from the air inlet; the winding motor is drivingly connected to the winding roller; the guide roller is rotatably connected to the bottom of the filtering frame; the winding roller is wound with a filter screen; the filter screen penetrates into the filtering frame downward, passes through the winding roller and is connected to the winding roller; and a fan body is connected to the casing and can make the air in the casing flow from the air inlet to the air outlet. The application can conveniently replace the filter screen, reduces manual operation, prolongs the service life of the filter screen by shifting the position of the filter screen and improves the utilization rate of the filter screen.

Description

Technical Field

[0001] This invention relates to an air conditioner, and more particularly to a fresh air system. Background Technology

[0002] The air inlet of a fresh air system is equipped with a filter. After prolonged use, the filter accumulates a significant amount of dust, requiring replacement. Currently, replacement is typically done manually, by removing and installing the filter from the fresh air system housing and the screws securing it. This method is cumbersome, and since fresh air systems are usually installed at a high position, workers need to climb to a higher location to perform the replacement, resulting in low efficiency. Therefore, there is an urgent need for a fresh air system that allows for convenient filter replacement. Summary of the Invention

[0003] The purpose of this invention is to provide a new type of air ventilator to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this invention is:

[0005] A fresh air fan includes: a housing with an air inlet on one side and an air outlet on the other side; a filtration mechanism including a filter frame, an unwinding roller, a winding roller, a guide roller, and a winding motor; the filter frame is connected inside the housing, and a filtration channel is formed inside the filter frame facing the air inlet; the unwinding roller and the winding roller are rotatably connected inside the housing above the filter frame, with the unwinding roller located further away from the air inlet relative to the winding roller; the winding motor drives the winding roller; the guide roller is rotatably connected to the bottom of the filter frame; a filter screen is wound on the winding roller, and the filter screen passes downward through the filter frame, around the winding roller, and is connected to the winding roller; and a fan body connected inside the housing, enabling air inside the housing to flow from the air inlet to the air outlet.

[0006] This technical solution has at least the following beneficial effects: Within the filtration mechanism, the filter screen released from the unwinding roller passes through the housing and around the guide roller, forming a first filtration section that blocks the filtration channel. The filter screen, after passing around the guide roller and connecting to the take-up roller, forms another filtration section that blocks the filtration channel. Thus, double filtration is formed within the filter frame. When the fan operates, the air inside the housing flows from the inlet to the outlet. When outside air enters the inlet, it undergoes double filtration by the filter screen before entering the housing and finally exiting from the outlet, greatly improving the air purification effect. However, after prolonged use, a significant amount of dust adheres to the filter screen. At this point, starting the take-up motor, because the unwinding roller is located relative to the take-up roller... On the side further away from the air inlet, when the take-up roller rewinds, the part of the filter screen closer to the air inlet has more dust adhering to it and will be directly wound onto the take-up roller. Meanwhile, the part of the filter screen on the side relatively farther from the air inlet has less dust adhering to it and will be transferred to the side closer to the air inlet after passing around the guide roller, continuing to be used as a first-stage filtration section. The filter screen released from the unwind roller will be transferred to the side relatively farther from the air inlet, forming a new first-stage filtration section. This completes the filter screen replacement, making filter screen replacement convenient, reducing manual operation, and extending the filter screen's lifespan by shifting its position, thus improving the filter screen's utilization rate. It also provides double filtration and purification of the incoming air, improving the cleanliness of the output fresh air and resulting in a better overall user experience.

[0007] As a further improvement to the above technical solution, the present invention also includes a cleaning mechanism disposed within the filter frame. A collection hopper is connected to the bottom side of the filter frame, and a recycling box is connected to the bottom end of the collection hopper. With the direction from the air inlet to the air outlet as the left-right direction, a gap is provided between the front and rear sides of the filter screen and the front and rear sides of the filter frame. Two guide rollers are spaced apart along the left-right direction. The cleaning mechanism is located between the two guide rollers and can clean the filter screen on both the front and rear sides. When the filter needs to be replaced, the winding motor is started. The filter, located between the unwinding roller and the guide roller, is driven through the space between the two guide rollers. At the interval between the two guide rollers, the cleaning mechanism cleans the filter and sweeps the adhering material to the two gaps. The adhering material falls from the gap into the collection hopper and is finally collected in the recycling box. In this way, the filter can be cleaned and then moved to the side closer to the air inlet, improving the cleanliness of the filter and reducing the amount of dust and other substances blown from the filter near the air inlet to the filter away from the air inlet, which helps to ensure the air purification effect.

[0008] As a further improvement to the above technical solution, the cleaning mechanism includes a cleaning motor and a cleaning roller. The cleaning roller is rotatably connected to the filter frame and is located between the two guide rollers. The front and rear ends of the cleaning roller extend into the two gaps respectively. The cleaning motor is driven and connected to the cleaning roller. The rotation direction of the cleaning roller is opposite to the rotation direction of the take-up roller. A front cleaning brush and a rear cleaning brush are connected to the cleaning roller. The front cleaning brush extends forward spirally from the middle of the cleaning roller, and the rear cleaning brush extends backward spirally from the middle of the cleaning roller. The cleaning brush and the rear cleaning brush abut against the filter screen. When the filter screen needs to be replaced, start the winding motor and the cleaning motor. The winding motor winds up the filter screen to move it, while the cleaning motor drives the cleaning roller to rotate. The front and rear cleaning brushes on the cleaning roller also rotate with the cleaning roller, forming two spiral cleaning channels in opposite directions on the outside of the cleaning roller. Since the rotation direction of the cleaning roller is opposite to that of the winding roller, the cleaning roller can use the front and rear cleaning brushes to sweep the material adhering to the filter screen away from the air inlet. As the filter screen continues to move towards the air inlet, the swept material can be transferred back to the cleaning roller. In this way, as the front and rear cleaning brushes spirally push the filter screen forward and backward, the material adhering to the filter screen can be gradually swept out and transferred to the gaps at the front and rear ends of the cleaning roller, thus cleaning the filter screen and reducing the accumulation of dust at the turning position of the filter screen.

[0009] As a further improvement to the above technical solution, a switch valve is provided at the bottom of the collection hopper. When the fresh air unit is operating normally for fresh air purification, the switch valve is in the closed state, which can isolate the collection box and prevent dust in the collection box from flowing upward into the collection hopper during fresh air purification.

[0010] As a further improvement to the above technical solution, support frames are connected to the front and rear sides of the filter frame, respectively. The portion of the filter screen located between the take-up roller and the guide roller is designated as the first filter section, and the portion located between the unwind roller and the guide roller is designated as the second filter section. The first and second filter sections abut against the front and rear sides of the two support frames, respectively. When air enters the air inlet, it is first purified by the first filter section, and then purified again by the second filter section before flowing out of the air outlet. The support frames located between the first and second filter sections improve the structural stability of the first and second filter sections and reduce the shaking of the entire filter screen.

[0011] As a further improvement to the above technical solution, an air guide tube is slidably connected inside the housing at the air inlet position. A first linear drive is connected to the housing, and the first linear drive is drive-connected to the air guide tube. The first linear drive can drive the air guide tube to slide against or away from the first filter section. During normal fresh air purification operation, the first linear drive drives the air guide tube to slide against the first filter section. At this time, the air guide tube and the support frame can clamp the first filter section from both sides, further improving the stability of the first filter section during operation. The air guide tube itself can guide the airflow, and the air entering from the air guide tube is directly blown towards the first filter section for purification. When the filter needs to be replaced, the first linear drive drives the air guide tube to slide away from the first filter section. At this time, the filter can slide along the surface of the support frame to realize the transfer of the filter position. After completion, the first linear drive drives the air guide tube to slide against the first filter section again.

[0012] As a further improvement to the above technical solution, a sealing ring is connected to one end of the air guide tube facing the first filter section. The air guide tube abuts against the first filter section through the sealing ring, which can improve the tightness of the connection between the air guide tube and the first filter tube, reduce the flow of air from the air guide tube to the first filter section along the surface of the first filter section to the surrounding areas, and improve the air purification effect.

[0013] As a further improvement to the above technical solution, a brush is connected inside the filter frame above the guide roller. The brush extends in the front-to-back direction and abuts against the side of the first filter section away from the air inlet. When the filter needs to be replaced, the filter moves upward after passing the guide roller near the air inlet. At this time, the brush above the guide roller can clean the filter again, pushing down any substances adhering to the filter. This improves the cleanliness of the filter when it is transferred from the second filter section to the first filter section, thereby further improving the air purification effect.

[0014] As a further improvement to the above technical solution, a pressure frame is slidably connected to the end of the filter frame away from the air inlet. A second linear drive is connected to the filter frame, and the second linear drive is drive-connected to the pressure frame. The second linear drive can drive the pressure frame to slide against the second filter section or slide away from the second filter section. Similarly, during normal fresh air purification operation, the second linear drive drives the pressure frame to slide against the second filter section. At this time, the pressure frame and the support frame can clamp the second filter section from both sides, further improving the stability of the second filter section during operation. When the filter needs to be replaced, the second linear drive drives the pressure frame to slide away from the second filter section. At this time, the filter can slide along the surface of the support frame to realize the transfer of the filter position. After completion, the second linear drive drives the pressure frame to slide back to abut against the second filter section.

[0015] As a further improvement to the above technical solution, an airflow sensor is installed within the filter frame between the first and second filter sections. When a new filter is used for fresh air purification, the airflow sensor measures the airflow between the first and second filter sections. At this time, the airflow value is the normal value. However, after prolonged operation, the airflow entering the filtration channel after passing through the first filter section decreases. When the airflow value measured by the airflow sensor is lower than expected, the filter can be replaced. In this way, the airflow sensor can directly indicate the degree of turbidity of the filter, making it easy to determine whether filter replacement is necessary. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0017] Figure 1 This is an overall front view of the present invention.

[0018] Figure 2 yes Figure 1 A schematic diagram of the AA cross-sectional structure.

[0019] Figure 3 yes Figure 2 A schematic diagram of the BB cross-sectional structure.

[0020] Figure 4 yes Figure 2 A magnified schematic diagram of part C.

[0021] In the attached diagram: 100-machine housing, 110-air inlet, 120-air outlet, 210-filter frame, 220-unwinding roller, 230-winding roller, 240-guide roller, 250-gap, 260-support frame, 300-fan body, 410-collecting hopper, 420-recovery box, 430-cleaning roller, 431-front cleaning brush, 432-rear cleaning brush, 440-pulling brush, 510-air guide tube, 520-first linear drive, 530-pressure frame, 540-second linear drive, 610-first sealing strip, 620-electromagnetic telescopic rod, 630-second sealing strip, 700-filter screen. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0024] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0026] Reference Figure 1 and Figure 2A new type of air ventilator includes a housing 100, a filter mechanism, and a fan body 300. An air inlet 110 is provided on one side of the housing 100, and an air outlet 120 is provided on the other side. The filter mechanism includes a filter frame 210, an unwinding roller 220, a winding roller 230, a guide roller 240, and a winding motor. The filter frame 210 is connected inside the housing 100, and a filter channel is formed within the filter frame 210 directly opposite the air inlet 110. The unwinding roller 220 and the winding roller 230 are rotatably connected inside the housing 100, positioned above the filter frame 210. The rotation axes of the unwinding roller 220 and the winding roller 230 are horizontally aligned and perpendicular to the line connecting the air inlet 110 and the air outlet 120. The unwinding roller 220 is located further away from the winding roller 230. On one side away from the air inlet 110, the winding motor drives and connects to the winding roller 230. The guide roller 240 is rotatably connected to the bottom of the filter frame 210. A filter screen 700 is wound on the winding roller 230. The filter screen 700 passes downward into the filter frame 210, passes around the winding roller 230, and is connected to the winding roller 230. When the filter screen 700 is guided in the filter frame 210, it can completely block the air filtration channel, so that the air entering from the air inlet 110 can be better purified by the filter screen 700. The fan body 300 is connected to the housing 100, which enables the air in the housing 100 to flow from the air inlet 110 to the air outlet 120. The air inlet end of the fan body 300 can face the air inlet 110 directly, or it can be set perpendicular to the air inlet 110, while the air outlet end faces the air outlet 120 of the housing 100.

[0027] As described above, within the filtration mechanism, the filter screen 700, released from the unwinding roller 220, passes through the housing 100 and around the guide roller 240, forming a first filtration section that blocks the filtration channel. The filter screen 700, after passing around the guide roller 240 and connecting to the take-up roller 230, forms another filtration section that blocks the filtration channel. Thus, a double filtration is formed within the filter frame 210. When the fan body 300 operates, the air inside the housing 100 flows from the inlet 110 to the outlet 120. When outside air enters the inlet 110, it undergoes double filtration by the filter screen 700 before entering the housing 100 and finally exiting from the outlet 120, greatly improving the air purification effect. However, after prolonged use, a significant amount of dust adheres to the filter screen 700. When the take-up motor is started, the unwinding roller 220, located further away from the take-up roller 230, will... On one side of the air inlet 110, when the take-up roller 230 is winding up, the part of the filter screen 700 closer to the air inlet 110 has more dust adhering to it and will be directly wound onto the take-up roller 230. Meanwhile, the part of the filter screen 700 farther away from the air inlet 110 has less dust adhering to it and will be transferred to the side closer to the air inlet 110 after passing around the guide roller 240, and will continue to be used as a first-stage filtration section. The filter screen 700 released from the unwind roller 220 will be transferred to the side farther away from the air inlet 110 to form a new first-stage filtration section, thus completing the replacement of the filter screen 700. This makes it convenient to replace the filter screen 700, reduces manual operation, and extends the service life of the filter screen 700 by moving its position, improving the utilization rate of the filter screen 700. It can also perform double filtration and purification of the incoming air, improve the cleanliness of the output fresh air, and improve the overall user experience.

[0028] The area where the air is first filtered by the filter screen 700 within the filtration channel is the first filtration zone, and the area where the air is second filtered by the filter screen 700 is the second filtration zone. When passing through the first filtration zone, most of the dust and other substances adhere to the side of the filter screen 700 closest to the air inlet 110. Since this part of the filter screen 700 is directly wound onto the take-up roller 230 for recycling, there is no need to consider cleaning this part of the filter screen 700. However, for the part of the filter screen 700 located in the second filtration zone, when purifying the air, dust and other substances also adhere to the side closest to the air inlet 110. When the filter screen 700 is replaced, if it is not cleaned in time, the adhered dust and other substances will move to the first filtration zone along with the position of the filter screen 700. At this time, the adhered dust and other substances are located on the side of the filter screen 700 away from the air inlet 110. Under the blowing of the incoming air from the air inlet 110, the airflow easily blows the dust and other substances adhered in the first filtration zone onto the filter screen 700 in the second filtration zone.

[0029] To address this issue, the present invention further includes a cleaning mechanism disposed within the filter frame 210. A collection hopper 410 is connected to the bottom side of the filter frame 210, and a recycling box 420 is connected to the bottom end of the collection hopper 410. With the direction from the air inlet 110 to the air outlet 120 as the left-right direction, a gap 250 is provided between the front and rear sides of the filter screen 700 and the front and rear sides of the filter frame 210. Two guide rollers 240 are spaced apart along the left-right direction. The cleaning mechanism is located between the two guide rollers 240, and the cleaning mechanism is capable of cleaning the filter screen 700 on both the front and rear sides. When the filter 700 needs to be replaced, the winding motor is started. The filter 700, located between the unwinding roller 220 and the guide roller 240, is driven through the space between the two guide rollers 240. At the interval between the two guide rollers 240, the cleaning mechanism can clean the filter 700 and sweep the adhering material to the two gaps 250. The adhering material falls from the gaps 250 into the collection hopper 410 for collection, and finally falls into the recycling box 420 for recycling. In this way, the filter 700 can be cleaned and then transferred to the side closer to the air inlet 110, which improves the cleanliness of the filter 700 and reduces the amount of dust and other substances blown from the side of the filter 700 closer to the air inlet 110 onto the side of the filter 700 farther away from the air inlet 110, which helps to ensure the air purification effect.

[0030] like Figure 3 As shown in the illustration, as one embodiment of the cleaning mechanism, the cleaning mechanism includes a connecting beam, an electric lead screw, and a first cleaning brush. The connecting beam is connected within the filter frame 210 and located between the two cleaning rollers 430. The connecting beam extends in the front-to-back direction. The electric lead screw is connected to the connecting beam, and the first cleaning brush is connected to the electric lead screw. The first cleaning brush abuts against the filter screen 700, and the electric lead screw can drive the first cleaning brush to move in the front-to-back direction. When it is necessary to clean the filter screen 700, the electric lead screw provides a driving force to the first cleaning brush in the front-to-back direction, which can dislodge dust and other substances adhering to the filter screen 700 into the gap 250 located in the front-to-back direction.

[0031] In Embodiment 1, the cleaning of the filter screen 700 relies mainly on the contact between the first cleaning brush and the filter screen 700 as the brush moves back and forth. This method has low cleaning efficiency. Embodiment 2, as the cleaning mechanism, includes a cleaning motor and a cleaning roller 430. The cleaning roller 430 is rotatably connected within the filter frame 210, and its rotation axis extends in the front-to-back direction. The cleaning roller 430 is located between the two guide rollers 240, and its front and rear ends are respectively... The sweeping motor extends into the two gaps 250 and is connected to the sweeping roller 430. The rotation direction of the sweeping roller 430 is opposite to that of the take-up roller 230. A front sweeping brush 431 and a rear sweeping brush 432 are connected to the sweeping roller 430. The front sweeping brush 431 extends forward spirally from the middle of the sweeping roller 430, and the rear sweeping brush 432 extends backward spirally from the middle of the sweeping roller 430. The sweeping brush and the rear sweeping brush 432 abut against the filter screen 700. When the filter 700 needs to be replaced, the winding motor and the cleaning motor are started. The winding motor winds up the filter 700 to transfer it, and the cleaning motor drives the cleaning roller 430 to rotate. The front cleaning brush 431 and the rear cleaning brush 432 on the cleaning roller 430 also rotate with the cleaning roller 430, forming two spiral cleaning channels in opposite directions on the outside of the cleaning roller 430. Since the rotation direction of the cleaning roller 430 is opposite to the rotation direction of the winding roller 230, the cleaning roller 430 can pass through the front cleaning brush 431 and the rear cleaning brush 432. The material adhering to the filter screen 700 is swept away from the air inlet 110. As the filter screen 700 is continuously moved towards the air inlet 110, the swept material can be transferred back to the cleaning roller 430. Thus, with the spiral push of the front cleaning brush 431 and the rear cleaning brush 432 at both ends, the material adhering to the filter screen 700 can be gradually swept away and transferred to the gap 250 at both ends of the cleaning roller 430, thereby cleaning the filter screen 700 and reducing the accumulation of dust at the turning position of the filter screen 700.

[0032] Airflow entering the filter channel from the air inlet 110 easily flows into the collection hopper 410 and is blown into the recovery box 420, causing dust in the recovery box 420 to become airborne. Although the collection hopper 410 and the filter channel are only connected by two gaps 250, which can effectively prevent dust entering the collection hopper 410 from being re-airborne into the filter channel, in order to further reduce dust airborne from the recovery box 420, in this embodiment, a switch valve is provided at the bottom of the collection hopper 410. When the fresh air unit is operating normally for fresh air purification, the switch valve is in the closed state, thus isolating the recovery box 420 and preventing dust in the recovery box 420 from flowing upward into the collection hopper 410 during fresh air purification.

[0033] In the above embodiment, in order to maintain sufficient tension in the unwinding roller 220 during unwinding, the unwinding roller 220 itself can also be driven by a motor to rotate. At this time, the unwound filter screen 700 is mainly held taut by the unwinding roller 220 and the take-up roller 230. In this embodiment, the front and rear sides of the filter frame 210 are respectively connected to support frames 260. The part of the filter screen 700 located between the take-up roller 230 and the guide roller 240 is the first filter section, that is, the part located in the first filtration zone is the first filter section. The part of the filter screen 700 located between the unwinding roller 220 and the guide roller 240 is the second filter section, that is, the part located in the second filtration zone is the second filter section. The first filter section and the second filter section abut against the front and rear sides of the two support frames 260 respectively. When air enters the air inlet 110, it first passes through the first filter section for purification, and then passes through the second filter section for further purification before flowing out from the air outlet 120. At this time, the support frame 260 located between the first and second filter sections can improve the structural stability of the first and second filter sections and reduce the shaking of the entire filter screen 700.

[0034] To further improve the wind pressure resistance of the first filtration section, such as Figure 4 As shown, in this embodiment, an air guide 510 is slidably connected inside the housing 100 at the position of the air inlet 110. A first linear drive 520 is connected to the housing 100. The first linear drive 520 is connected to the air guide 510 in a transmission connection. The first linear drive 520 can drive the air guide 510 to slide against the first filter section or slide away from the first filter section. During normal fresh air purification operation, the first linear drive 520 drives the air guide 510 to slide against the first filter section. At this time, the air guide 510 and the support frame 260 can clamp the first filter section from both sides, further improving the stability of the first filter section during operation. The air guide 510 itself can guide the airflow, and the air entering from the air guide 510 is directly blown towards the first filter section for purification. When the filter 700 needs to be replaced, the first linear drive 520 drives the air guide 510 to slide away from the first filter section. At this time, the filter 700 can slide along the surface of the support frame 260 to realize the transfer of the position of the filter 700. After completion, the first linear drive 520 drives the air guide 510 to slide against the first filter section again.

[0035] Furthermore, a sealing ring is connected to one end of the air guide duct 510 facing the first filter section. The air guide duct 510 abuts against the first filter section through the sealing ring, which can improve the tightness of the connection between the air guide duct 510 and the first filter section, reduce the flow of air blown from the air guide duct 510 to the first filter section along the surface of the first filter section, and improve the air purification effect.

[0036] To further improve the cleanliness of the filter 700 when it moves from the second filtration zone to the first filtration zone, in this embodiment, a brush 440 is connected inside the filter frame 210 above the guide roller 240. The brush 440 extends in the front-to-back direction and abuts against the side of the first filtration section away from the air inlet 110. When the filter 700 needs to be replaced, it moves upward after bypassing the guide roller 240 near the air inlet 110. At this time, the brush 440 above the guide roller 240 can clean the filter 700 again, brushing off any adhering substances. This improves the cleanliness of the filter 700 when it moves from the second filtration section to the first filtration section, thereby further improving the air purification effect.

[0037] Similarly, in order to improve the ability of the second filter section to withstand wind pressure, in this embodiment, a pressure frame 530 is slidably connected to one end of the filter frame 210 away from the air inlet 110, and a second linear drive 540 is connected to the filter frame 210. The second linear drive 540 is connected to the pressure frame 530 in a transmission connection, and the second linear drive 540 can drive the pressure frame 530 to slide against the second filter section or slide away from the second filter section. Similarly, during normal fresh air purification operation, the second linear drive 540 drives the pressure frame 530 to slide against the second filter section. At this time, the pressure frame 530 and the support frame 260 can clamp the second filter section from left to right, further improving the stability of the second filter section during operation. When the filter screen 700 needs to be replaced, the second linear drive 540 drives the pressure frame 530 to slide away from the second filter section. At this time, the filter screen 700 can slide along the surface of the support frame 260 to realize the transfer of the position of the filter screen 700. After completion, the second linear drive 540 drives the pressure frame 530 to slide back against the second filter section.

[0038] The filter frame 210 can be formed by four rectangular plates connected end to end. When the filter frame 210 is connected to the housing 100, the plates on both sides of the filter frame 210 can be connected to the housing 100. Since the filter screen 700 needs to pass through the filter frame 210 from the top side downwards, two clearance slots can be provided at intervals along the front and back direction on the top side of the filter frame 210. The filter screen 700 passes through one clearance slot and enters the filter frame 210, and passes through the other clearance slot upwards and exits the filter frame 210. A first sealing strip 610 and an electromagnetic telescopic rod 620 are connected to the front and rear sides of the clearance slots in the filter channel, respectively. A second sealing strip 630 is connected to the movable end of the electromagnetic telescopic rod 620. The filter screen 700 abuts against the first sealing strip 610. The electromagnetic telescopic rod 620 can move the second sealing strip 630 closer to or away from the filter screen 700. The first sealing strip 610 and the second sealing strip 630 are also provided on the front and rear sides of the two clearance slots. When normal fresh air purification is required, the electromagnetic telescopic rod 620 moves the second sealing strip 630 against the filter screen 700. At this time, the first sealing strip 610 and the second sealing strip 630 clamp the filter screen 700 from front to back, which can effectively reduce gas leakage upward from here. When the filter screen 700 needs to be replaced, the electromagnetic telescopic rod 620 moves the second sealing strip 630 away from the filter screen 700. At this time, the clamping of the filter screen 700 can be released, and the filter screen 700 can be replaced.

[0039] In practical applications, the first linear drive 520 and the second linear drive 540 are mainly used to provide drive along a straight line, and their structural forms are varied, such as electric lead screws or pneumatic rods. The support frame 260 may include two horizontal beams spaced apart in the vertical direction and two vertical beams connected between the two horizontal beams. At this time, the pressure on the first filter section and the second filter section forms a rectangular pressure, so that the pressure frame 530 and the air guide duct 510 will be more stable when pressing the first filter section and the second filter section against the support frame 260.

[0040] To facilitate the assessment of filter 700's usage, in this embodiment, an airflow sensor is installed within the filter frame 210 between the first and second filter sections. When a new filter 700 is used for fresh air purification, the airflow sensor measures the airflow between the first and second filter sections. This airflow value is normal. However, after prolonged operation, if the airflow entering the filtration channel after passing through the first filter section decreases, and the airflow value measured by the airflow sensor is lower than expected, then filter 700 can be replaced. Thus, the airflow sensor provides a direct indication of the filter 700's turbidity, facilitating the determination of whether filter 700 needs replacement.

[0041] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A fresh air ventilator, characterized in that: include: The casing (100) has an air inlet (110) on one side and an air outlet (120) on the other side. The filtration mechanism includes a filter frame (210), an unwinding roller (220), a winding roller (230), a guide roller (240), and a winding motor. The filter frame (210) is connected inside the housing (100), and a filtration channel is formed inside the filter frame (210) facing the air inlet (110). The unwinding roller (220) and the winding roller (230) are rotatably connected inside the housing (100) above the filter frame (210). The unwinding roller (220) is located on the side further away from the air inlet (110) relative to the winding roller (230). The winding motor drives the winding roller (230). The guide roller (240) is rotatably connected to the bottom of the filter frame (210). The winding roller (230) has a winding mechanism with... A filter screen (700) passes downward into the filter frame (210), then around the take-up roller (230) and is connected to the take-up roller (230). Two clearance slots are provided at intervals along the front-back direction on the top side of the filter frame (210). The filter screen (700) enters the filter frame (210) after passing through one clearance slot and exits the filter frame (210) upward from the other clearance slot. A first sealing strip (610) and an electromagnetic telescopic rod (620) are respectively connected on the front and back sides of the clearance slot in the filter channel. A second sealing strip (630) is connected to the movable end of the electromagnetic telescopic rod (620). The filter screen (700) abuts against the first sealing strip (610). The electromagnetic telescopic rod (620) can drive the second sealing strip (630) to move closer to or away from the filter screen (700). The fan body (300) is connected inside the casing (100) and enables the air inside the casing (100) to flow from the air inlet (110) to the air outlet (120). A cleaning mechanism is installed inside the filter frame (210). A collection hopper (410) is connected to the bottom side of the filter frame (210), and a recycling box (420) is connected to the bottom end of the collection hopper (410). With the direction from the air inlet (110) to the air outlet (120) as the left-right direction, a gap (250) is provided between the front and rear sides of the filter screen (700) and the front and rear sides of the filter frame (210). Two guide rollers (240) are spaced apart along the left-right direction. The cleaning mechanism is located between the two guide rollers (240). The cleaning mechanism can clean the filter screen (700) on both the front and rear sides. The cleaning mechanism includes a cleaning motor and a cleaning roller (430). The cleaning roller (430) is rotatably connected to the filter frame (210). Inside the filter frame (210), the cleaning roller (430) is located between the two guide rollers (240). The front and rear ends of the cleaning roller (430) extend into the two gaps (250) respectively. The cleaning motor is connected to the cleaning roller (430). The rotation direction of the cleaning roller (430) is opposite to the rotation direction of the take-up roller (230). A front cleaning brush (431) and a rear cleaning brush (432) are connected to the cleaning roller (430). The front cleaning brush (431) extends forward spirally from the middle of the cleaning roller (430), and the rear cleaning brush (432) extends backward spirally from the middle of the cleaning roller (430). The cleaning brush and the rear cleaning brush (432) abut against the filter screen (700).

2. A fresh air ventilator according to claim 1, characterized in that: The bottom end of the hopper (410) is equipped with a switch valve.

3. A fresh air ventilator according to claim 1, characterized in that: The filter frame (210) is connected to the front and rear sides of the filter frame (260) respectively. The part of the filter screen (700) located between the take-up roller (230) and the guide roller (240) is the first filter section, and the part of the filter screen (700) located between the unwind roller (220) and the guide roller (240) is the second filter section. The first filter section and the second filter section abut against the front and rear sides of the two support frames (260) respectively.

4. A fresh air ventilator according to claim 3, characterized in that: An air guide tube (510) is slidably connected inside the housing (100) at the position of the air inlet (110). A first linear drive (520) is connected to the housing (100). The first linear drive (520) is connected to the air guide tube (510) in a transmission connection. The first linear drive (520) can drive the air guide tube (510) to slide against the first filter section or slide away from the first filter section.

5. A fresh air ventilator according to claim 4, characterized in that: A sealing ring is connected to one end of the air guide tube (510) facing the first filter section.

6. A fresh air ventilator according to claim 3, characterized in that: A brush (440) is connected inside the filter frame (210) above the guide roller (240). The brush (440) extends in the front-back direction and abuts against the side of the first filter section away from the air inlet (110).

7. A fresh air ventilator according to claim 3, characterized in that: The filter frame (210) is slidably connected to a pressure frame (530) at one end away from the air inlet (110). A second linear drive (540) is connected to the filter frame (210). The second linear drive (540) is connected to the pressure frame (530) in a transmission connection. The second linear drive (540) can drive the pressure frame (530) to slide against the second filter section or slide away from the second filter section.

8. A fresh air ventilator according to claim 3, characterized in that: An airflow sensor is installed inside the filter frame (210) between the first filter section and the second filter section.

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