Natural ventilation filter for building facades in cold regions

Abstract

The utility model relates to the technical field of ventilation, and disclose a natural ventilation filter for building outer wall of severe cold area, including filter casing, the inside fixed mounting of filter casing has support plate, the inside movable mounting of support plate has mounting plate, the top fixed mounting of mounting plate has axial flow fan, the utility model discloses compared with traditional filter, this filter environmental adaptability is strong, and the whole structure can adapt to severe cold environment, avoids low temperature influence component function, ensures that still can stable operation in winter, satisfies the demand of building natural ventilation, and the ventilation filtering effect is good, and after the axial flow fan of mounting plate top starts, its output end fan blade and support plate bottom fan blade coordinate rotation, constructs stable airflow channel in filter casing, and the outside air is sent into the room after filtering through the channel, realizes efficient ventilation, and guarantees indoor air quality, and convenient maintenance adjusts simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of ventilation technology, and more specifically, to a natural ventilation filter for the exterior walls of buildings in extremely cold regions. Background Technology

[0002] Natural ventilation filters for building exterior walls in frigid regions are ventilation and filtration devices adapted to low-temperature, high-wind environments and installed on the exterior walls of buildings in such regions. Based on a filter housing frame, it integrates filter plates, axial flow fans, support plates, and other components, combining natural ventilation and air filtration functions. Reinforcing ribs and a double-fixed structure ensure structural stability in frigid environments. Equipped with convenient maintenance components, it efficiently filters outdoor air and delivers it indoors to meet building ventilation needs. Existing technologies using bolts and nuts for the installation of natural ventilation filters for building exterior walls in frigid regions present several problems: at low temperatures, bolts and nuts are prone to stripping and breakage due to metal brittleness, and freeze-thaw cycles can cause corrosion at the joints, leading to loosening over time and affecting the filter's structural stability; during installation and maintenance, workers wearing cold-weather gloves find it inconvenient to operate the bolts, requiring significant effort to tighten them, and low temperatures can cause them to jam, resulting in time-consuming and inefficient disassembly; furthermore, maintenance of internal components requires complete removal of the bolts and nuts, a cumbersome process that can lead to prolonged downtime and affect the ventilation needs of buildings in frigid environments. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a natural ventilation filter for the exterior walls of buildings in extremely cold regions, which has the advantage of convenient installation of axial flow fans.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a natural ventilation filter for the exterior walls of buildings in frigid regions, comprising a filter housing, a support plate fixedly installed inside the filter housing, an mounting plate movably installed inside the support plate, an axial flow fan fixedly installed on the top of the mounting plate, fan blades fixedly installed at the output end of the axial flow fan, fan blades fixedly installed at the bottom of the support plate, and a housing fixedly installed at the bottom of the support plate; The support plate and mounting plate have positioning holes inside, and positioning blocks are movably installed inside the positioning holes. A pull rod is fixedly installed at the bottom of the positioning block, and one end of the pull rod passes through the inside of the box. A spring is fixedly installed between the positioning block and the box.

[0005] As a preferred embodiment of this utility model, the filter housing has fixing grooves on both the front and rear sides. Limiting blocks are movably installed inside the fixing grooves. A filter plate is fixedly installed between the two limiting blocks. A second limiting post is fixedly installed on the outer side of the filter plate. A first limiting post is fixedly installed on the outer side of the filter housing. A limiting workpiece is movably installed on the outer surface of the first limiting post. A groove at one end of the limiting workpiece is engaged with the outer surface of the second limiting post. A first push rod is fixedly installed on the top of the limiting workpiece, and the first push rod is U-shaped.

[0006] As a preferred embodiment of this utility model, a fixing seat is fixedly installed on the inner side of the filter housing, a fixing block is movably installed inside the fixing seat, and a toolbox is fixedly installed on the left side of the fixing block.

[0007] As a preferred embodiment of this utility model, a reinforcing rib is fixedly installed at the angle between the filter housing and the support plate.

[0008] In a preferred embodiment of this invention, the inner diameter of the fixing seat is equal to the outer diameter of the fixing block, and the interior of the fixing seat is made smooth.

[0009] As a preferred embodiment of this utility model, a second push rod is fixedly installed on the front side of the mounting plate, and the outer surface of the second push rod presents a U-shaped form.

[0010] As a preferred embodiment of this utility model, the filter plate and the limiting block are arranged in pairs, with two sets in total, and are movably installed inside the filter housing.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Compared with traditional filters, this utility model has strong environmental adaptability. Its overall structure can adapt to cold environments, avoiding the impact of low temperatures on component functions and ensuring stable operation in winter to meet the natural ventilation needs of buildings. Moreover, it has excellent ventilation and filtration effects. After the axial flow fan at the top of the mounting plate is started, its output fan blades and the fan blades at the bottom of the support plate rotate together, creating a stable airflow channel within the filter housing. Outside air is filtered through the channel and then sent into the room, achieving both efficient ventilation and ensuring indoor air quality. At the same time, maintenance and adjustment are convenient. The support plate and mounting plate are detachably fixed through positioning holes and positioning blocks. When staff need to inspect or adjust, they only need to pull the lever to disengage the positioning block from the positioning hole, and after adjustment, they can release the lever to reset and fix it. No complicated operation is required, saving maintenance time. In addition, the components are well protected. The filter housing provides basic protection for internal components, and the housing can also protect the positioning blocks and springs, reducing component wear in cold environments and extending the service life of the equipment. 2. Compared with traditional filters, this utility model uses a double-fixing design. The filter plate is installed by aligning the limiting blocks on both sides of the filter plate with the front and rear fixing slots of the filter housing. The limiting workpiece is then placed on the first limiting post and pushed to engage with the second limiting post. This double-fixing design effectively prevents the filter plate from shifting, making it suitable for harsh, cold, and windy environments. Assembly is simple and efficient. Furthermore, it provides efficient and clean ventilation: during ventilation, outside air enters the filter housing under the power of the fan blades, first passing through the filter plate to remove impurities, ensuring clean indoor air. Simultaneously, due to the double-fixing structure of the filter plate, it remains stable even in harsh, cold, and windy conditions, without affecting ventilation efficiency, thus balancing practicality and cleanliness. In addition, maintenance is convenient and labor-saving: when the filter plate needs to be replaced or cleaned, the operator only needs to hold the first U-shaped push rod and pull it to disengage the limiting workpiece from the second limiting post, pulling out the filter plate and allowing the limiting blocks to leave the fixing slots. After maintenance, the process is reversed to reinstall the filter plate. No complicated operations are required, significantly saving maintenance time and labor costs. Attached Figure Description

[0012] Figure 1 This is a frontal three-dimensional appearance structural diagram of the present utility model; Figure 2 This is a schematic diagram of the internal structure of the filter housing of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the filter housing of this utility model; Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the exploded structure of the limiting workpiece of this utility model; Figure 6 This is an exploded structural diagram of the mounting plate of this utility model.

[0013] In the diagram: 1. Filter housing; 2. Filter plate; 3. Limiting block; 4. Limiting workpiece; 5. First limiting post; 6. Second limiting post; 7. First push rod; 8. Fixing groove; 9. Fixing seat; 10. Fixing block; 11. Toolbox; 12. Support plate; 13. Reinforcing rib; 14. Axial flow fan; 15. Fan blade; 16. Mounting plate; 17. Second push rod; 18. Housing; 19. Positioning block; 20. Pull rod; 21. Spring; 22. Positioning hole. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figures 1 to 6 As shown, this utility model provides a natural ventilation filter for the exterior wall of a building in a frigid region, including a filter housing 1, a support plate 12 fixedly installed inside the filter housing 1, an mounting plate 16 movably installed inside the support plate 12, an axial flow fan 14 fixedly installed on the top of the mounting plate 16, a fan blade 15 fixedly installed at the output end of the axial flow fan 14, a fan blade 15 fixedly installed at the bottom of the support plate 12, and a housing 18 fixedly installed at the bottom of the support plate 12. The support plate 12 and the mounting plate 16 have positioning holes 22 inside. A positioning block 19 is movably installed inside the positioning hole 22. A pull rod 20 is fixedly installed at the bottom of the positioning block 19, and one end of the pull rod 20 passes through the inside of the box 18. A spring 21 is fixedly installed between the positioning block 19 and the box 18.

[0016] When using the natural ventilation filter for the exterior walls of buildings in frigid regions, the staff first constructs an overall frame based on the filter housing 1. The filter housing 1 provides protection and a foundation for the internal components. The fixed support plate 12 inside is the core load-bearing structure. The support plate 12 and the movable mounting plate 16 are detachably fixed through positioning holes 22 and positioning blocks 19. The positioning blocks 19 are embedded in the positioning holes 22 under the elastic force of the spring 21 to stabilize the mounting plate 16. The pull rod 20 at the bottom of the positioning block 19 passes through the box 18 at the bottom of the support plate 12. The box 18 also provides protection for the positioning blocks 19 and the spring 21. When the filter is working, the axial flow fan 14 at the top of the mounting plate 16 starts, and its output fan blade 15 rotates in coordination with the fan blade 15 at the bottom of the support plate 12, forming an airflow channel in the filter housing 1. Outside air is driven into the channel by the fan blade 15, filtered, and then sent into the room, making it suitable for cold environments. When the mounting plate 16 needs to be repaired or adjusted, the pull rod 20 drives the positioning block 19 to overcome the elastic force of the spring 21 and disengage from the positioning hole 22. After moving the mounting plate 16 to the target position, the pull rod 20 is released, the spring 21 returns to its original position, and pushes the positioning block 19 into the positioning hole 22, fixing the mounting plate 16 so that the filter can resume stable operation.

[0017] When using a natural ventilation filter for exterior walls of buildings in frigid regions, a frame is first constructed based on the filter housing 1. The filter housing 1 provides protection and a foundation for the internal components. The fixed support plate 12 inside is the core load-bearing structure. The support plate 12 and the movable mounting plate 16 are detachably fixed through positioning holes 22 and positioning blocks 19. The positioning blocks 19 are embedded in the positioning holes 22 under the elastic force of the spring 21 to secure the mounting plate 16. The pull rod 20 at the bottom of the positioning block 19 passes through the box 18 at the bottom of the support plate 12. The box 18 also protects the positioning blocks 19 and the spring 21. When the filter is working, the axial flow fan 14 at the top of the mounting plate 16 starts, and its output fan blades 15 rotate in tandem with the fan blades 15 at the bottom of the support plate 12, creating an airflow channel inside the filter housing 1. Outside air is driven into the channel by the fan blades 15, filtered, and then sent into the room, adapting to frigid environments. When the mounting plate 16 needs maintenance or adjustment, the pull rod 20 drives the positioning block 19 to overcome the elastic force of the spring 21 and disengage from the positioning hole 22. After moving the mounting plate 16 to the target position, the pull rod 20 is released, the spring 21 returns to its original position, and pushes the positioning block 19 into the positioning hole 22, fixing the mounting plate 16 and restoring the filter to work. Compared with traditional filters, this filter has strong environmental adaptability, and its overall structure can adapt to cold environments, avoiding the impact of low temperatures on component functions, ensuring stable operation in winter, and meeting the building's natural ventilation needs. Moreover, it has excellent ventilation and filtration effects. After the axial flow fan 14 at the top of the mounting plate 16 is started, its output fan blades 15 and the fan blades 15 at the bottom of the support plate 12 rotate together. A stable airflow channel is constructed within the filter housing 1, allowing outside air to be filtered and delivered into the room, achieving both efficient ventilation and ensuring indoor air quality. Maintenance and adjustment are convenient; the support plate 12 and mounting plate 16 are detachably fixed via positioning holes 22 and positioning blocks 19. During inspection or adjustment, staff only need to pull the lever 20 to disengage the positioning block from the positioning hole, and then release the lever to reset it, eliminating the need for complex operations and saving maintenance time. Furthermore, component protection is adequate; the filter housing 1 provides basic protection for internal components, and the housing 18 protects the positioning blocks 19 and springs 21, reducing component wear in cold environments and extending equipment lifespan. The filter housing 1 has a fixing groove 8 on both the front and rear sides. A limiting block 3 is movably installed inside the fixing groove 8. A filter plate 2 is fixedly installed between the two limiting blocks 3. The outer side of the filter plate 2 is fixedly installed on the second limiting post 6. A first limiting post 5 is fixedly installed on the outer side of the filter housing 1. A limiting workpiece 4 is movably installed on the outer surface of the first limiting post 5. The groove at one end of the limiting workpiece 4 is engaged with the outer surface of the second limiting post 6. A first push rod 7 is fixedly installed on the top of the limiting workpiece 4. The first push rod 7 is U-shaped.

[0018] When assembling natural ventilation filters for exterior walls of buildings in frigid regions, the first step is to secure the filter structure: First, align the limiting blocks 3 on both sides of the filter plate 2 with the fixing grooves 8 at the front and rear of the filter housing 1, initially defining the position of the filter plate 2. Next, place the limiting workpiece 4 onto the first limiting post 5 on the outside of the filter housing 1, and push the limiting workpiece 4 so that one end of its groove engages with the second limiting post 6 on the outside of the filter plate 2, doubly securing the filter plate 2 to prevent displacement. The U-shaped first push rod 7 at the top of the limiting workpiece 4 facilitates subsequent adjustments. When the filter ventilates, outside air... Driven by the fan blade 15, the air enters the filter housing 1 and first passes through the filter plate 2 to remove impurities, ensuring clean indoor air. The filter plate 2 is double-fixed by the limiting block 3 and the fixing groove 8, and the limiting workpiece 4 and the first limiting post 5 and the second limiting post 6, which keeps it stable even in cold and windy environments and does not affect efficiency. If the filter plate 2 needs to be replaced or cleaned, simply grasp the U-shaped first push rod 7 and pull it away from the second limiting post 6 to make the limiting workpiece 4 rotate around the first limiting post 5 and disengage. Then pull out the filter plate 2 to make the limiting block 3 leave the fixing groove 8 for maintenance. After maintenance, reinstall it in reverse order to restore stable operation.

[0019] When assembling a natural ventilation filter for exterior walls of buildings in frigid regions, first fix the filter structure: align the limiting blocks 3 on both sides of the filter plate 2 with the front and rear fixing grooves 8 of the filter housing 1 and insert them for initial positioning; then, place the limiting workpiece 4 onto the first limiting post 5 on the outside of the filter housing 1, and push it so that its groove engages with the second limiting post 6 on the outside of the filter plate 2, providing double fixation to prevent displacement. The U-shaped first push rod 7 facilitates subsequent adjustments. During ventilation, outside air enters the filter housing 1 through the fan blades 15, and is filtered by the filter plate 2 to ensure cleanliness. The filter plate 2 is stable in strong winds and frigid conditions due to its double fixation. During maintenance, grasp the first push rod 7 and pull it away from the second limiting post 6, causing the limiting workpiece 4 to detach, and pull out the filter plate 2 to remove the limiting blocks 3 from the fixing grooves 8. After maintenance, reverse the steps to reassemble. Compared with traditional filters, this filter aligns the limiting blocks 3 on both sides of the filter plate 2 with the front and rear fixing grooves 8 of the filter housing 1 and inserts them into the filter housing. Then, the limiting workpiece 4 is placed on the first limiting post 5 and pushed to engage with the second limiting post 6. The double fixing design effectively prevents the filter plate 2 from shifting, adapting to severe cold and strong wind environments. The assembly operation is simple and efficient. On the other hand, the ventilation is efficient and clean: during ventilation, the outside air enters the filter housing 1 under the power of the fan blade 15, and first passes through the filter plate 2 to remove impurities, ensuring clean indoor air. At the same time, due to the double fixing structure of the filter plate 2, it can remain stable even in severe cold and strong winds, without affecting the ventilation efficiency, taking into account both practicality and cleanliness. In addition, maintenance is convenient and labor-saving: when the filter plate 2 needs to be replaced or cleaned, the staff only needs to hold the U-shaped first push rod 7 and pull it to drive the limiting workpiece 4 away from the second limiting post 6, pull out the filter plate 2 and let the limiting block 3 leave the fixing groove 8. After maintenance, the steps are reversed to reinstall it. No complicated operation is required, which greatly saves maintenance time and labor costs.

[0020] The filter housing 1 has a fixed base 9 installed inside, a fixed block 10 is movably installed inside the fixed base 9, and a toolbox 11 is fixedly installed on the left side of the fixed block 10.

[0021] Because the inner fixing seat 9 of the filter housing 1 cooperates with the movable fixing block 10, the toolbox 11 can be flexibly installed to store maintenance tools. This makes it more convenient for staff to retrieve and put away tools when maintaining the filter in cold environments, further improving maintenance efficiency and saving operation time.

[0022] A reinforcing rib 13 is fixedly installed at the angle between the filter housing 1 and the support plate 12.

[0023] Because a reinforcing rib 13 is fixedly installed at the angle between the filter housing 1 and the support plate 12, the connection strength between the two can be greatly improved, resisting structural deformation and strong wind impact in severe cold environments, ensuring the stability of the core load-bearing structure, reducing component wear, and extending the overall service life of the filter.

[0024] The inner diameter of the fixing seat 9 is equal to the outer diameter of the fixing block 10, and the interior of the fixing seat 9 is made smooth.

[0025] Since the inner diameter of the fixing seat 9 is equal to the outer diameter of the fixing block 10, and the inside of the fixing seat 9 is smooth, the two can fit precisely during installation, reducing friction. The toolbox 11 can be easily installed and removed even in cold environments, while ensuring a stable connection and preventing loosening from affecting use.

[0026] The second push rod 17 is fixedly installed on the front of the mounting plate 16, and the outer surface of the second push rod 17 has a U-shaped shape.

[0027] Because the mounting plate 16 has a U-shaped second push rod 17 fixed on its front, the U-shaped design makes it easy for workers to grip and apply force when adjusting or removing the mounting plate 16. This allows for smooth operation even when wearing gloves in cold weather, further improving the convenience and efficiency of maintenance and adjustment. The filter plate 2 and the limiting block 3 are installed in pairs inside the filter housing 1.

[0028] Since the filter plate 2 and the limiting block 3 are installed in two sets, a total of two sets, in the filter housing 1, the air filtration accuracy and efficiency can be enhanced. Moreover, no machine shutdown is required when maintaining a single set. In severe cold, the staff can flexibly replace them, ensuring continuous and stable ventilation of the filter and reducing the impact of maintenance on use.

[0029] Working principle and usage process of this utility model: When using the natural ventilation filter for the exterior walls of buildings in frigid regions, the staff first constructs an overall frame based on the filter housing 1. The filter housing 1 provides protection and a foundation for the internal components. The fixed support plate 12 inside is the core load-bearing structure. The support plate 12 and the movable mounting plate 16 are detachably fixed through positioning holes 22 and positioning blocks 19. The positioning blocks 19 are embedded in the positioning holes 22 under the elastic force of the spring 21 to stabilize the mounting plate 16. The pull rod 20 at the bottom of the positioning block 19 passes through the box 18 at the bottom of the support plate 12. The box 18 also provides protection for the positioning blocks 19 and the spring 21. When the filter is working, the axial flow fan 14 at the top of the mounting plate 16 starts, and its output fan blade 15 rotates in coordination with the fan blade 15 at the bottom of the support plate 12, forming an airflow channel in the filter housing 1. Outside air is driven into the channel by the fan blade 15, filtered, and then sent into the room, making it suitable for cold environments. When the mounting plate 16 needs to be repaired or adjusted, the pull rod 20 drives the positioning block 19 to overcome the elastic force of the spring 21 and disengage from the positioning hole 22. After moving the mounting plate 16 to the target position, the pull rod 20 is released, the spring 21 returns to its original position, and pushes the positioning block 19 into the positioning hole 22, fixing the mounting plate 16 so that the filter can resume stable operation.

[0030] When assembling natural ventilation filters for exterior walls of buildings in frigid regions, the first step is to secure the filter structure: First, align the limiting blocks 3 on both sides of the filter plate 2 with the fixing grooves 8 at the front and rear of the filter housing 1, initially defining the position of the filter plate 2. Next, place the limiting workpiece 4 onto the first limiting post 5 on the outside of the filter housing 1, and push the limiting workpiece 4 so that one end of its groove engages with the second limiting post 6 on the outside of the filter plate 2, doubly securing the filter plate 2 to prevent displacement. The U-shaped first push rod 7 at the top of the limiting workpiece 4 facilitates subsequent adjustments. When the filter ventilates, outside air... Driven by the fan blade 15, the air enters the filter housing 1 and first passes through the filter plate 2 to remove impurities, ensuring clean indoor air. The filter plate 2 is double-fixed by the limiting block 3 and the fixing groove 8, and the limiting workpiece 4 and the first limiting post 5 and the second limiting post 6, which keeps it stable even in cold and windy environments and does not affect efficiency. If the filter plate 2 needs to be replaced or cleaned, simply grasp the U-shaped first push rod 7 and pull it away from the second limiting post 6 to make the limiting workpiece 4 rotate around the first limiting post 5 and disengage. Then pull out the filter plate 2 to make the limiting block 3 leave the fixing groove 8 for maintenance. After maintenance, reinstall it in reverse order to restore stable operation.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A natural ventilation filter for exterior walls of buildings in frigid regions, comprising a filter housing (1), characterized in that: A support plate (12) is fixedly installed inside the filter housing (1). An mounting plate (16) is movably installed inside the support plate (12). An axial flow fan (14) is fixedly installed on the top of the mounting plate (16). A fan blade (15) is fixedly installed at the output end of the axial flow fan (14). A fan blade (15) is fixedly installed at the bottom of the support plate (12). A housing (18) is fixedly installed at the bottom of the support plate (12). The support plate (12) and the mounting plate (16) are provided with positioning holes (22). A positioning block (19) is movably installed inside the positioning hole (22). A pull rod (20) is fixedly installed at the bottom of the positioning block (19), and one end of the pull rod (20) passes through the inside of the box (18). A spring (21) is fixedly installed between the positioning block (19) and the box (18).

2. The natural ventilation filter for building exterior walls in frigid regions according to claim 1, characterized in that: The filter housing (1) has a fixing groove (8) on both the front and rear sides. A limiting block (3) is movably installed inside the fixing groove (8). A filter plate (2) is fixedly installed between the two limiting blocks (3). The filter plate (2) is fixedly installed on the outside of a second limiting post (6). A first limiting post (5) is fixedly installed on the outside of the filter housing (1). A limiting workpiece (4) is movably installed on the outer surface of the first limiting post (5). The groove at one end of the limiting workpiece (4) is engaged with the outer surface of the second limiting post (6). A first push rod (7) is fixedly installed on the top of the limiting workpiece (4). The first push rod (7) is U-shaped.

3. The natural ventilation filter for building exterior walls in frigid regions according to claim 1, characterized in that: A fixing seat (9) is fixedly installed on the inner side of the filter housing (1), and a fixing block (10) is movably installed inside the fixing seat (9). A toolbox (11) is fixedly installed on the left side of the fixing block (10).

4. The natural ventilation filter for building exterior walls in frigid regions according to claim 1, characterized in that: A reinforcing rib (13) is fixedly installed at the angle between the filter housing (1) and the support plate (12).

5. The natural ventilation filter for building exterior walls in frigid regions according to claim 3, characterized in that: The inner diameter of the fixing seat (9) is equal to the outer diameter of the fixing block (10), and the interior of the fixing seat (9) is set to a smooth surface.

6. The natural ventilation filter for building exterior walls in frigid regions according to claim 1, characterized in that: The second push rod (17) is fixedly installed on the front of the mounting plate (16), and the outer surface of the second push rod (17) presents a U-shaped form.

7. The natural ventilation filter for building exterior walls in frigid regions according to claim 2, characterized in that: The filter plate (2) and the limiting block (3) are paired up, and there are two sets of them movable inside the filter housing (1).

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