A filter and a ventilation system having the same

Abstract

The application relates to the technical field of indoor ventilation, in particular to a filter and a ventilation system with the same. The filter comprises a shell, a filter core arranged in the shell, and a flow rate adjusting device arranged at a position close to the edge of the filter core. The flow rate adjusting device comprises an inner shell, an elastic sheet and a driving assembly. The elastic sheet is arranged in the inner shell, one end of the elastic sheet is fixedly connected with the inner side wall of the inner shell, and the other end is a free end. The elastic sheet has a first state of being accommodated in the inner shell and a second state of extending out of the inner shell to cover part of the surface of the filter core. The driving assembly is suitable for driving the elastic sheet to switch between the first state and the second state. The driving assembly drives the elastic sheet in the inner shell to pop out of the inner shell and enables the elastic sheet to cover the surface of the filter core, so that the ventilation area of the filter core can be adjusted, the resistance can be increased or reduced, and the function of adjusting the air supply size of the filter core is realized. The filter of the application has simple structure, small volume, and is more conducive to installation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of indoor ventilation technology, and more specifically to a filter and a ventilation system having the same. Background Technology

[0002] In centralized air supply scenarios, the ventilation system has multiple air outlets and corresponding filters. As the filters are used for a long time, the accumulation of dust and other impurities will cause the filter resistance to change, resulting in different air volumes at different air outlets.

[0003] To address this issue, existing technologies typically involve adding a fan or valve to the air supply duct. The additional power from the fan or the additional resistance from the valve is used to regulate the airflow from the filter, ensuring consistent airflow across different outlets. However, adding a fan alone only increases airflow; adding a valve alone only decreases airflow. Therefore, both a fan and a valve must be installed simultaneously for comprehensive airflow control. However, this simultaneous installation increases the complexity and size of the overall components, making installation and maintenance more difficult. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art, which is that adding both a fan and a valve at the same time will increase the complexity and volume of the overall components and make installation and maintenance difficult, thereby providing a filter and a ventilation system having the same.

[0005] To address the above problems, the present invention provides a filter comprising: case; The filter element is disposed within the housing; A flow rate regulating device is disposed near the edge of the filter element. The flow rate regulating device includes an inner shell, an elastic sheet, and a drive assembly. The elastic sheet is disposed inside the inner shell. One end of the elastic sheet is fixedly connected to the inner sidewall of the inner shell, and the other end is a free end. It has a first state of being housed in the inner shell and a second state of extending out of the inner shell to cover a portion of the surface of the filter element. The drive assembly is adapted to drive the elastic sheet to switch between the first state and the second state.

[0006] Furthermore, it also includes: A limiting component is disposed within the inner shell, and the driving component is adapted to drive the limiting component to rotate in order to limit the elastic sheet and keep it in a first state, or to release the limiting of the elastic sheet and keep it in a second state.

[0007] Furthermore, a pair of inner shells are fixed inside the housing and are arranged opposite to each other and parallel to the filter element, and each inner shell includes two support members arranged at intervals; The limiting assembly includes a plurality of limiting baffles spaced apart along the height direction of the filter element and a rotating member supported at one end of the lower surface of the limiting baffles. The plurality of limiting baffles are respectively staggered on two opposing support members of a pair of inner shells. One end of the limiting baffle is rotatably connected to the support member, and the other end is a free end with a space reserved between it and the inner wall of the support member. The elastic sheet is bent and wound in the elastic sheet channel formed by the plurality of limiting baffles. The driving assembly is adapted to drive the rotating member to support at one end of the lower surface of the limiting baffle to limit the elastic sheet and keep it in a first state, or to rotate to a side away from the limiting baffle, so that the limiting baffle rotates to a vertical position to release the limiting of the elastic sheet and keep it in a second state.

[0008] Furthermore, the rotating member is a wedge-shaped block, having at least a first surface that contacts the limiting baffle and a second surface that contacts the driving assembly, and is rotatably connected to the support member via a shaft and a torsion spring sleeved on the shaft.

[0009] Furthermore, the drive assembly is provided in two sets, and the drive assembly is disposed on the inner shell. The drive assembly includes a motor, a gear, and a pusher plate. The gear is rotatably disposed on the support member, and the motor is disposed on one side of the gear. The output shaft of the motor is connected to the gear. The pusher plate is movably disposed on the guide rails of a pair of support members. The pusher plate meshes with the gear. When the gear drives the pusher plate to reciprocate along the guide direction of the guide rail, the pusher plate can push the rotating member to rotate until the first surface contacts the limiting stop plate, or release the limiting stop plate of the rotating member so that the limiting stop plate and the rotating member rotate until the elastic sheet extends out of the inner shell to cover a portion of the surface of the filter element.

[0010] Furthermore, the drive assembly includes a motor, a gear, and two pushers. The gear is rotatably mounted on the housing, and the motor is mounted on one side of the gear. The output shaft of the motor is connected to the gear. The two pushers are movably mounted on the guide rails of a corresponding pair of support members. The two pushers mesh with the gear. When the gear drives the pushers to reciprocate along the guide direction of the guide rail, the pushers can push the rotating member to rotate until the first surface contacts the limiting stop, or release the limiting stop of the rotating member on the limiting stop, causing the limiting stop and the rotating member to rotate until the elastic sheet extends out of the inner shell to cover a portion of the filter element surface.

[0011] Furthermore, the drive assembly includes a motor, gears, and pushers. Two gears and two pushers are respectively disposed on a corresponding pair of support members. The motor is disposed between the two gears and is connected to the two gears respectively via the transmission belt. The pushers mesh with the gears. When the gears drive the pushers to reciprocate along the guide direction of the guide rail, the pushers can push the rotating member to rotate until the first surface contacts the limiting stop, or release the limiting stop of the rotating member on the limiting stop, causing the limiting stop and the rotating member to rotate until the elastic sheet extends out of the inner shell to cover a portion of the filter element surface.

[0012] Furthermore, the top of the support member is provided with a bent portion, the gear is located at the bent portion, and the pusher plate has a chain-like structure.

[0013] Furthermore, the filter element has a quadrilateral structure, and the flow rate regulating device is provided on all four sides of the filter element; Also includes: A control system is connected to each of the flow rate regulating devices, and the control system is adapted to control the linkage or individual movement of multiple flow rate regulating devices.

[0014] The present invention also provides a ventilation system including the filter described in any of the above embodiments.

[0015] The present invention has the following advantages: 1. This invention provides a filter in which a flow rate regulating device is provided on the filter element. The driving component drives an elastic sheet inside the inner shell to pop out from the inner shell and cover the surface of the filter element. The driving component can also retract the elastic sheet into the inner shell, thereby adjusting the ventilation area of ​​the filter element and increasing or decreasing the resistance, thus regulating the air supply of the filter element. The filter of this application has a simple structure, small size, and is more conducive to installation and maintenance.

[0016] 2. This filter structure features multiple limiting baffles on both sides of the inner shell. These baffles are parallel and staggered, forming a spring channel that limits the elastic sheet. A drive assembly rotates the limiting baffles toward the opening of the inner shell, releasing them from their restraint and allowing the elastic sheet to pop out from the spring channel. By using multiple limiting baffles, the extension amount of the elastic sheet can be better adjusted, thereby controlling the area of ​​the elastic sheet covering the filter element and adjusting the airflow.

[0017] 3. In this filter structure, a push plate is set, which meshes with a gear, so that the rotating end of the limiting baffle abuts against the surface of the push plate. The supporting force of the push plate on the limiting baffle is greater than the weight of the limiting baffle itself, so that the limiting baffle is perpendicular to the inner shell and limits the elastic sheet. After the gear drives the push plate to move, the limiting baffle loses the supporting force and rotates, releasing the limiting force on the elastic sheet, and the elastic sheet can then pop out from the inner shell. The filter of this application has a simple structure, small size, and is more conducive to installation and maintenance.

[0018] 4. This filter structure, by setting up a control system, connects the control system to multiple flow rate regulating devices, thereby enabling multiple flow rate regulating devices to move in tandem or controlling only a single flow rate regulating device, thus improving its practicality. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the filter structure in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the filter element after it is partially blocked in Embodiment 1 of the present invention; Figure 3 This is a cross-section of the filter in Embodiment 1 of the present invention. Figure 1 ; Figure 4 This is a cross-section of the filter in Embodiment 1 of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the driving component in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the pusher plate in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the filter structure in Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the filter structure in Embodiment 3 of the present invention; Explanation of reference numerals in the attached figures: 1. Shell; 2. Filter element; 3. Flow rate regulating device; 4. Inner shell; 5. Elastic sheet; 6. Limiting baffle; 7. Spring sheet channel; 8. Motor; 9. Gear; 10. Push plate; 11. Guide rail; 12. Rotating component; 13. Shaft; 14. Transmission belt; 15. Support component. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Example 1 like Figures 1 to 6 As shown, this embodiment provides a filter, including: a housing 1, a filter element 2, and a flow rate regulating device 3. The filter element 2 is disposed inside the housing 1. The flow rate regulating device 3 is disposed near the edge of the filter element 2. The flow rate regulating device 3 includes an inner shell 4, an elastic sheet 5, and a driving assembly. The elastic sheet 5 is disposed inside the inner shell 4. One end of the elastic sheet 5 is fixedly connected to the inner sidewall of the inner shell 4, and the other end is a free end. It has a first state of being housed in the inner shell 4 and a second state of extending out of the inner shell 4 to cover a portion of the surface of the filter element 2. The driving assembly is adapted to drive the elastic sheet 5 to switch between the first state and the second state.

[0026] Specifically, the flow rate regulating device 3 is located near the edge of the filter element 2. The flow rate regulating device 3 is located on the air outlet side of the filter element 2. The flow rate regulating device 3 includes an inner shell 4, an elastic sheet 5, and a drive assembly. The inner shell 4 is fixedly installed inside the housing 1 and located near the edge of the filter element 2. One end of the elastic sheet 5 is fixedly connected to the inner wall of the inner shell 4, and the other end is a free end. When the elastic sheet 5 is installed inside the inner shell 4, it is in the first state. When it is necessary to reduce the air volume, the drive assembly drives the free end of the elastic sheet 5 to extend out of the inner shell 4 and make the elastic sheet 5 cover part of the surface of the filter element 2, thereby reducing the area of ​​the filter element 2, increasing the air resistance, thereby reducing the air flow and making the air volume smaller. At this time, the elastic sheet 5 is in the second state.

[0027] It should be noted that the amount of extension of the drive component to drive the elastic sheet 5 can be controlled to adjust the air volume as needed, thereby controlling the area of ​​the elastic sheet 5 covering the surface area of ​​the filter element 2, thus adjusting the air resistance and achieving the purpose of adjusting different air volumes.

[0028] Preferably, in this embodiment, the flow rate regulating device 3 is located on the air outlet side of the filter element 2, resulting in cleaner air on the air outlet side. The flow rate regulating device 3 located on the air outlet side can effectively extend its service life. Furthermore, the flow rate regulating device 3 located on the air outlet side is easier to disassemble and clean. In other optional embodiments, the flow rate regulating device 3 can also be located on the air inlet side of the filter element 2.

[0029] Furthermore, it also includes a limiting component. The limiting component is disposed within the inner shell 4, and the driving component is adapted to drive the limiting component to rotate so as to limit the elastic piece 5 to maintain it in a first state, or to release the limiting of the elastic piece 5 to maintain it in a second state.

[0030] Specifically, such as Figure 3 and Figure 4 As shown, the lower end of the inner shell 4 has an opening, and the free end of the elastic piece 5 can extend out from the opening of the inner shell 4. The limiting component is rotatably disposed inside the inner shell 4. The limiting component can close the opening of the inner shell 4 and limit the elastic piece 5, so that the elastic piece 5 cannot extend out from the opening, keeping the elastic piece 5 in the first state. The driving component drives the limiting component to rotate, so that the limiting component opens the opening of the inner shell 4, releases the limitation on the elastic piece 5, and the elastic piece 5 can extend out from the opening, keeping the elastic piece 5 in the second state.

[0031] Furthermore, a pair of inner shells 4 are fixed inside the shell 1 and are arranged opposite to each other and parallel to the filter element 2. Each inner shell 4 includes two support members 15 spaced apart. The limiting assembly includes a plurality of limiting baffles 6 spaced apart along the height direction of the filter element 2 and a rotating member 12 supported on one end of the lower surface of the limiting baffles 6. The plurality of limiting baffles 6 are respectively staggered on the two opposing support members 15 of the pair of inner shells 4. One end of the limiting baffle 6 is rotatably connected to the support member 15, and the other end is a free end, with a space reserved between it and the inner wall of the support member 15. The elastic sheet 5 is bent and wrapped in the elastic sheet channel 7 formed by the plurality of limiting baffles 6. The driving assembly is adapted to drive the rotating member 12 to support one end of the lower surface of the limiting baffle 6 to limit the elastic sheet 5 and keep it in a first state, or to rotate to a side away from the limiting baffle 6, so that the limiting baffle 6 rotates to a vertical position to release the limiting of the elastic sheet 5 and keep it in a second state.

[0032] Specifically, such as Figures 3 to 6 As shown, two inner shells 4 parallel to the filter element 2 are fixedly arranged inside the housing 1. The two inner shells 4 are arranged opposite to each other. Each inner shell 4 includes two support members 15, which are spaced apart. The tops of the two support members 15 of a pair of inner shells 4 are connected to each other.

[0033] exist Figure 3 In the middle, one end of the elastic sheet 5 is fixedly connected to two support members 15 of the left inner shell 4. The limiting assembly includes multiple limiting baffles 6 and a rotating member 12 supported on one end of the lower surface of the limiting baffles 6. The multiple limiting baffles 6 are respectively arranged on two opposing support members 15 of a pair of inner shells 4. One end of the limiting baffle 6 is rotatably connected to the support member 15 through the rotating member 12. The other end of the limiting baffle 6 has a gap with the inner wall of the opposing support member 15. The multiple staggered limiting baffles 6 form a spring sheet channel 7. The elastic sheet 5 is bent and wrapped in the spring sheet channel 7. The spring sheet channel 7 formed by the limiting baffles 6 can limit the elastic sheet 5, so that the elastic sheet 5 is in the first state. At this time, the rotating member 12 is supported on the bottom surface of the limiting baffle 6, so that the limiting baffle 6 and the support member 15 are perpendicular to each other.

[0034] The drive assembly can drive the rotating component 12 to rotate, and the rotating component 12 drives the limiting baffle 6 to move towards Figure 4 The lower part rotates, causing the limiting baffle 6 to release the limiting of the elastic sheet 5. Due to its own elasticity, the elastic sheet 5 can extend out of the inner shell 4 and cover the surface of the filter element 2.

[0035] Furthermore, the rotating member 12 is a wedge-shaped block, having at least a first surface that contacts the limiting baffle 6 and a second surface that contacts the driving assembly, and is rotatably connected to the support member 15 via a shaft 13 and a torsion spring sleeved on the shaft 13.

[0036] Furthermore, the drive assembly is provided in two sets. The drive assembly is set on the inner shell 4. The drive assembly includes a motor 8, a gear 9 and a pusher 10. The gear 9 is rotatably set on the support member 15. The motor 8 is set on one side of the gear 9. The output shaft of the motor 8 is connected to the gear 9. The pusher 10 is movably set on the guide rail 11 of a pair of support members 15. The pusher 10 meshes with the gear 9. When the gear 9 drives the pusher 10 to reciprocate along the guide direction of the guide rail 11, the pusher 10 can push the rotating member 12 to rotate until the first surface contacts the limiting baffle 6, or release the limiting baffle 6 of the rotating member 12 so that the limiting baffle 6 and the rotating member 12 rotate until the elastic piece 5 extends out of the inner shell 4 to cover part of the surface of the filter element 2.

[0037] Specifically, such as Figures 3 to 6 As shown, a pair of inner shells 4 are each equipped with a set of driving components, including a motor 8, a gear 9, and a pusher plate 10. The gear 9 is rotatably mounted on the support member 15, and the motor 8 is located on one side of the gear 9. The output shaft of the motor 8 is connected to the gear 9, and the motor 8 can drive the gear 9 to rotate. The pusher plate 10 is movably mounted on the guide rail 11 of the pair of support members 15. The pusher plate 10 meshes with the gear 9, and the rotation of the gear 9 will drive the pusher plate 10 to move. When the elastic plate 5 is in the first state, the second surface of the rotating member 12 abuts against the surface of the pusher plate 10, and the pusher plate 10 can provide support force for the rotating member 12, so that the rotating member 12 can support the limiting stop plate 6 so that it is perpendicular to the support member 15 and limits the elastic plate 5; the motor 8 drives the gear 9 to rotate, and the gear 9 drives the pusher plate 10 along the guide rail 11. Figure 4 As it moves upward, the second surface of the rotating component 12 disengages from the surface of the push plate 10, and the rotating component 12 moves towards the surface due to the weight of the limiting stop plate 6 and the elastic force of the torsion spring. Figure 4 The bottom is rotated to release the restriction on the elastic sheet 5, so that the elastic sheet 5 changes from the first state to the second state and extends out from the inner shell 4 to cover part of the surface of the filter element 2.

[0038] Furthermore, such as Figure 5 or Figure 6 As shown, the top of the support member 15 is provided with a bent portion, the gear 9 is located at the bent portion, and the pusher 10 has a chain-like structure. When the pusher 10 moves to the bent portion of the support member 15, it will bend along with the bent portion. The bending of the pusher 10 can save space at the top of the support member 15.

[0039] Furthermore, such as Figure 2 As shown, filter element 2 has a quadrilateral structure, and flow rate regulating devices 3 are provided on all four sides of filter element 2.

[0040] Furthermore, it also includes a control system, which is connected to the flow rate regulating device 3. The control system is suitable for controlling the linkage or individual movement of multiple flow rate regulating devices 3. The control system is electrically connected to the motor 8, and the motor 8 controls the extension and retraction of the elastic sheet 5.

[0041] The implementation method of this embodiment is as follows: When airflow adjustment is required, the control system controls motor 8 to drive gear 9 to rotate, and gear 9 rotates to drive pusher 10 along... Figure 4 As it moves upward, the second surface of the rotating component 12 disengages from the surface of the push plate 10, and the rotating component 12 moves towards the limit stop plate 6 due to its own weight and the elastic force of the torsion spring. Figure 4 The pusher plate 10 rotates downwards, releasing the restraint on the elastic sheet 5, causing it to transition from the first state to the second state. The elastic sheet 5 then extends from the inner shell 4 using its own elastic force, covering a portion of the filter element 2 surface. As the pusher plate 10 moves, more restraining plates 6 rotate, increasing the extension of the elastic sheet 5 and expanding the coverage area. When it is necessary to retract the elastic sheet 5, the control system controls the motor 8 to drive the gear 9 to rotate in the opposite direction, causing the pusher plate 10 to move along... Figure 4 As the device moves downwards, the pusher 10 pushes the second surface of the rotating member 12, causing the rotating member 12 to rotate. At this time, the pushing force of the pusher 10 is greater than the sum of the weight of the limiting stop plate 6 and the elastic force of the torsion spring. The rotation of the rotating member 12 will drive the limiting stop plate 6 to rotate, so that the limiting stop plate 6 is reset and perpendicular to the support member 15. While the limiting stop plate 6 is rotating, the free end of the limiting stop plate 6 will retract the elastic piece 5 into the inner shell 4 and limit the elastic piece 5 in the elastic channel. After all the limiting stop plates 6 are reset, the control system controls the motor 8 to stop driving the gear 9. At this time, the elastic piece 5 changes from the second state to the first state, and the second surface of the rotating member 12 abuts against the surface of the pusher 10.

[0042] Example 2 The filter provided in this embodiment differs from that in Embodiment 1 in that: Figure 7 As shown, the drive assembly includes a motor 8, a gear 9, and two pushers 10. The gear 9 is rotatably mounted on the housing 1. The motor 8 is mounted on one side of the gear 9, and the output shaft of the motor 8 is connected to the gear 9. The two pushers 10 are movably mounted on the guide rails 11 of a corresponding pair of support members 15. The two pushers 10 mesh with the gear 9. When the gear 9 drives the pushers 10 to reciprocate along the guide direction of the guide rails 11, the pushers 10 can push the rotating member 12 to rotate until the first surface contacts the limiting baffle 6, or release the limiting baffle 6 from the limiting baffle 6, causing the limiting baffle 6 and the rotating member 12 to rotate until the elastic sheet 5 extends out of the inner shell 4 to cover a portion of the surface of the filter element 2.

[0043] Specifically, in this embodiment, a motor 8 and a gear 9 are used to drive two push plates 10, which are located on the upper and lower sides of the gear 9 respectively. The implementation method of this embodiment is the same as that in embodiment 1.

[0044] Example 3 The filter provided in this embodiment differs from those in Embodiments 1 and 2 in that: Figure 8 As shown, the drive assembly includes a motor 8, gears 9, and pushers 10. Two gears 9 and two pushers 10 are respectively mounted on a pair of corresponding support members 15. The motor 8 is mounted between the two gears 9 and is connected to the two gears 9 via a transmission belt 14. The pushers 10 mesh with the gears 9. When the gears 9 drive the pushers 10 to reciprocate along the guide direction of the guide rail 11, the pushers 10 can push the rotating member 12 to rotate until the first surface contacts the limiting baffle 6, or release the limiting baffle 6 from the rotating member 12, causing the limiting baffle 6 and the rotating member 12 to rotate until the elastic sheet 5 extends out of the inner shell 4 to cover a portion of the surface of the filter element 2.

[0045] Specifically, in this embodiment, the motor 8 is connected to two gears 9 via a transmission belt 14, and drives the two gears 9 to rotate via the transmission belt 14. The implementation method of this embodiment is the same as that in Embodiments 1 and 2.

[0046] Example 4 This embodiment provides a ventilation system, including: The filter is the filter described in any one of Examples 1, 2, and 3.

[0047] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A filter, characterized in that, include: Shell (1); Filter element (2) is disposed inside the housing (1); A flow rate regulating device (3) is disposed near the edge of the filter element (2). The flow rate regulating device (3) includes an inner shell (4), an elastic sheet (5), and a driving assembly. The elastic sheet (5) is disposed inside the inner shell (4). One end of the elastic sheet (5) is fixedly connected to the inner wall of the inner shell (4), and the other end is a free end. It has a first state of being housed in the inner shell (4) and a second state of extending out of the inner shell (4) to cover a portion of the surface of the filter element (2). The driving assembly is adapted to drive the elastic sheet (5) to switch between the first state and the second state. Also includes: A limiting component is disposed within the inner shell (4), and the driving component is adapted to drive the limiting component to rotate so as to limit the elastic sheet (5) to keep it in a first state, or to release the limiting of the elastic sheet (5) to keep it in a second state. A pair of inner shells (4) are fixed inside the housing (1) and are arranged opposite to each other and parallel to the filter element (2). Each inner shell (4) includes two support members (15) arranged at intervals. The limiting assembly includes a plurality of limiting baffles (6) spaced apart along the height direction of the filter element (2) and a rotating member (12) supported on one end of the lower surface of the limiting baffles (6). The plurality of limiting baffles (6) are respectively staggered on two opposing support members (15) of a pair of inner shells (4). One end of the limiting baffle (6) is rotatably connected to the support member (15), and the other end is a free end with a reserved space between it and the inner wall of the support member (15). The elastic sheet (5) is bent and wrapped in the elastic sheet channel (7) formed by the plurality of limiting baffles (6). The driving assembly is adapted to drive the rotating member (12) to support one end of the lower surface of the limiting baffle (6) to limit the elastic sheet (5) and keep it in a first state, or to rotate to a side away from the limiting baffle (6) so that the limiting baffle (6) rotates to a vertical position to release the limiting of the elastic sheet (5) and keep it in a second state.

2. The filter according to claim 1, characterized in that: The rotating member (12) is a wedge-shaped block, having at least a first surface that contacts the limiting baffle (6) and a second surface that contacts the driving assembly, and is rotatably connected to the support member (15) via a shaft (13) and a torsion spring sleeved on the shaft (13).

3. The filter according to claim 2, characterized in that: The drive assembly has two sets, which are mounted on the inner shell (4). Each drive assembly includes a motor (8), a gear (9), and a pusher (10). The gear (9) is rotatably mounted on the support member (15). The motor (8) is mounted on one side of the gear (9), and its output shaft is connected to the gear (9). The pusher (10) is movably mounted on the guide rails (11) of a pair of support members (15). The pusher (10) is connected to the inner shell (4). When the gear (9) meshes and the gear (9) drives the pusher (10) to reciprocate along the guide direction of the guide rail (11), the pusher (10) can push the rotating member (12) to rotate until the first surface contacts the limiting baffle (6), or release the limiting baffle (6) of the rotating member (12) so that the limiting baffle (6) and the rotating member (12) rotate until the elastic piece (5) extends out of the inner shell (4) to cover a part of the surface of the filter element (2).

4. The filter according to claim 2, characterized in that: The drive assembly includes a motor (8), a gear (9), and two pushers (10). The gear (9) is rotatably mounted on the housing (1). The motor (8) is mounted on one side of the gear (9). The output shaft (13) of the motor (8) is connected to the gear (9). The two pushers (10) are movably mounted on the guide rails (11) of a corresponding pair of support members (15). The two pushers (10) mesh with the gear (9). When the gear (9) drives the pushers (10) to reciprocate along the guide direction of the guide rail (11), the pushers (10) can push the rotating member (12) to rotate until the first surface contacts the limiting baffle (6), or release the limiting baffle (6) of the rotating member (12) so that the limiting baffle (6) and the rotating member (12) rotate until the elastic sheet (5) extends out of the inner shell (4) to cover a portion of the surface of the filter element (2).

5. The filter according to claim 2, characterized in that: The drive assembly includes a motor (8), gears (9) and pushers (10). Two gears (9) and two pushers (10) are respectively mounted on a pair of support members (15). The motor (8) is mounted between the two gears (9). The motor (8) is connected to the two gears (9) via a transmission belt (14). The pusher (10) meshes with the gears (9). When the gears (9) drive the pusher (10) to reciprocate along the guide direction of the guide rail (11), the pusher (10) can push the rotating member (12) to rotate until the first surface contacts the limiting baffle (6), or release the limiting baffle (6) of the rotating member (12) so that the limiting baffle (6) and the rotating member (12) rotate until the elastic sheet (5) extends out of the inner shell (4) to cover a portion of the surface of the filter element (2).

6. The filter according to any one of claims 3-5, characterized in that: The top of the support member (15) is provided with a bent part, the gear (9) is located at the bent part, and the pusher (10) has a chain-like structure.

7. The filter according to any one of claims 1-5, characterized in that: The filter element (2) has a quadrilateral structure, and the flow rate regulating device (3) is provided on all four sides of the filter element (2). Also includes: The control system is connected to the flow rate regulating device (3) respectively, and the control system is adapted to control the linkage or individual movement of multiple flow rate regulating devices (3).

8. A ventilation system, characterized in that, Includes the filter as described in any one of claims 1-7.

Images