Filtering device for ventilating duct

Abstract

The utility model discloses a filtering device for a ventilating duct, and relates to the technical field of filtering devices. An annular filter groove is formed in the peripheral side of the inner wall of the ventilation pipeline, an arc-shaped notch communicated with the annular filter groove is formed in the side portion of the ventilation pipeline, an annular installation frame is arranged in the annular filter groove in a running fit mode, an arc-shaped plate is arranged on the side portion of the annular installation frame, a supporting annular plate is arranged on the peripheral side of the inner wall of the annular installation frame, and a filter screen is placed on the supporting annular plate. A limiting assembly is arranged on the side portion of the ventilation pipeline. The positions of the connecting base and the outer gear ring are conveniently adjusted through the movable frame, meanwhile, the probability that the outer gear ring is blocked during rotation is reduced, the outer gear ring is conveniently inserted into the first annular clamping groove to be meshed with the inner gear ring through elastic sliding of the connecting base on the movable frame, and therefore the connecting base is rotated to drive the plug pin to slide. And the limiting of the semicircular clamping plate by the plug pin is canceled, so that the convenience of dismounting the filter screen is improved.

Description

Technical Field

[0001] This utility model belongs to the field of filtration devices, specifically, it relates to a filtration device for ventilation ducts. Background Technology

[0002] A filtration device for ventilation ducts is a device used to purify the air inside ventilation ducts.

[0003] Chinese patent CN220758370U discloses an air filtration device for a ventilation duct, comprising: a curved mounting strip with through holes at both ends, and the curved mounting strip being threadedly connected to the outer ring surface of the ventilation duct by bolts passing through the through holes.

[0004] The ventilation duct air filtration device disclosed in the application requires unscrewing two bolts on the arc-shaped mounting strip when disassembling and cleaning the filter element, making the disassembly and assembly process of the filter element cumbersome and time-consuming. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a filtration device for ventilation ducts, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A filtration device for ventilation ducts includes: a ventilation duct, an annular filter groove on the circumference of the inner wall of the ventilation duct, an arc-shaped slot communicating with the annular filter groove on the side, an annular mounting frame rotatably fitted inside the annular filter groove, an arc-shaped plate mounted on the side of the annular mounting frame, the arc-shaped plate rotatably fitted inside the arc-shaped slot, a support ring plate on the circumference of the inner wall of the annular mounting frame, a filter screen placed on the support ring plate, and a limiting component mounted on the side of the ventilation duct;

[0008] The limiting component includes a storage box installed on the side of the ventilation duct. A gear is rotatably fitted on one side of the inner wall of the storage box. One end face of the gear is provided with an annular groove. An internal gear ring is installed on the outer circumference of the annular groove. A movable frame is rotatably fitted on one side of the inner wall of the storage box. A connecting seat is elastically fitted on the movable frame. An external gear ring is installed on one end face of the connecting seat. The external gear ring and the internal gear ring are adapted to each other. A rack is elastically slidable on the lower side of the inner wall of the storage box. The gear meshes with the rack. A pin is installed on one side of the rack. A semi-circular retaining plate is installed on the side of the arc-shaped plate. The pin passes through the semi-circular retaining plate laterally.

[0009] Optionally, a support rod is installed on one side of the inner wall of the storage box, and a gear rotates and engages around the support rod. A stop is provided on one end of the support rod, and the gear is located between the stop and the ventilation duct.

[0010] Optionally, the connecting seat includes a support ring column, an external gear ring is installed on the end face of the support ring column near the ventilation duct, two connecting blocks are installed on the side of the support ring column, the connecting blocks are elastically fitted on the movable frame, a push rod is installed on the end face of the support ring column away from the ventilation duct, the end of the push rod away from the support ring column extends to the outside of the storage box, a handle is installed on one side of the push rod, and the handle is located on the side of the storage box away from the ventilation duct.

[0011] Optionally, a second annular groove is provided on one side of the inner wall of the storage box, and a bearing is installed on the inner circumference of the second annular groove, with the movable frame installed on the circumference of the bearing.

[0012] Optionally, the movable frame includes a connecting ring plate installed on the periphery of the bearing. The connecting ring plate is rotatably fitted in the annular groove. Two connecting rods are installed on one end face of the connecting ring plate. The connecting rods pass through the connecting block laterally. The push rod and the external gear ring are both located between the two connecting rods. Two springs are installed between the connecting block and the connecting ring plate. The springs are sleeved on the periphery of the corresponding connecting rods.

[0013] Optionally, an arc-shaped block is provided on the side of the pin away from the rack, and a through hole is provided in the horizontal direction of the semi-circular plate. The through hole penetrates the semi-circular plate, and the pin penetrates through the through hole.

[0014] Optionally, an annular baffle is provided on the inner wall of the ventilation duct, and the filter screen is located between the annular baffle and the supporting ring plate.

[0015] Optionally, the ventilation duct is connected to both the upper and lower ends with corrugated pipes, and a flange is installed on one end of the corrugated pipe, with the corrugated pipe located between the flange and the ventilation duct.

[0016] Optionally, the ventilation duct is equipped with two support plates on its side, and a fixing rod is installed between the upper and lower support plates. A cylinder is rotatably fitted around the fixing rod, and an L-shaped connecting plate is installed on the side of the cylinder. The L-shaped connecting plate is installed on the side of the arc plate, and a handle is installed on the side of the arc plate. The handle is located between the L-shaped connecting plate and the semi-circular clamping plate.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0018] The movable frame facilitates the position adjustment of the connecting seat and the outer gear ring, while reducing the probability of obstruction during the rotation of the outer gear ring. The connecting seat slides elastically on the movable frame, making it easy to insert the outer gear ring into the annular slot and engage with the inner gear ring. Rotating the connecting seat drives the pin to slide, thus removing the pin's restriction on the semi-circular retaining plate and improving the convenience of filter screen disassembly. At the same time, when the connecting seat is released, the outer gear ring and the inner gear ring quickly disengage, allowing the semi-circular retaining plate to rotate and squeeze the pin, reducing the probability of obstruction during rack sliding and improving the convenience of filter screen installation.

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0021] In the picture:

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the filter screen;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the connector;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the limiting component;

[0026] Figure 5 This is a schematic diagram of an L-shaped connecting plate structure.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] Ventilation duct 1, Corrugated pipe 2, Flange 3, Arc plate 4, Storage box 5, Handle 6, Filter screen 8, Arc block 9, Annular baffle 10, Support ring plate 11, Gear 12, Rack 13, Support rod 14, Internal gear ring 15, External gear ring 16, Support ring column 17, Connecting block 18, Connecting rod 19, Spring 20, Turn handle 21, Connecting ring plate 22, Bearing 23, Spring 1 24, Pin 25, Semi-circular clamping plate 26, L-shaped connecting plate 27, Support plate 28, Push rod 29.

[0029] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0030] 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.

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] A filtration device for ventilation ducts is a device used to purify the air inside ventilation ducts. Here is some common information about it:

[0033] Pre-filters: Primarily used to filter larger dust particles, hair, fibers, and other impurities. They typically use coarse filter screens, such as wire mesh or non-woven fabric. Their filtration efficiency is relatively low, but they offer low resistance, high dust holding capacity, and are easy to clean and replace. They are generally installed at the beginning of ventilation ducts as a primary filter, protecting subsequent filtration equipment.

[0034] Medium-efficiency filters: These are used to filter smaller dust particles, with a filtration accuracy typically between 1 and 10 microns. Common materials include fiberglass and synthetic fibers. Medium-efficiency filters have high filtration efficiency, effectively removing most dust from the air. They can be installed in the middle of ventilation ducts to further improve air quality.

[0035] High-efficiency particulate air (HEPA) filters can filter extremely small dust particles, and even microorganisms such as bacteria and viruses, with a filtration accuracy of 0.1-0.3 microns. They typically use high-performance filter materials such as ultra-fine glass fiber filter paper. HEPA filters have extremely high filtration efficiency, but they also have higher resistance and are relatively expensive. They are generally installed at the end of ventilation ducts in places with extremely high air quality requirements, such as operating rooms and laboratories.

[0036] Activated carbon filters: These filters utilize the adsorption properties of activated carbon to remove odors and harmful gases from the air, such as formaldehyde and benzene. Activated carbon filters can be used alone or in combination with other types of filters, and are typically installed in ventilation ducts where air purification of odors and harmful gases is required.

[0037] Protects the ventilation system: Prevents dust and other impurities from entering the ventilation system's fans, ducts, and other components, reducing wear and blockage and extending the service life of the ventilation system.

[0038] Improve indoor air quality: Effectively filter pollutants such as dust, pollen, and bacteria in the air, providing clean and healthy air indoors, improving people's living and working environment, and reducing the risk of respiratory diseases and other health problems.

[0039] Meeting the needs of special locations: In some places with extremely high air quality requirements, such as electronic chip manufacturing workshops and pharmaceutical sterile rooms, ventilation duct filtration devices can ensure the cleanliness of the production environment and guarantee product quality and the safety of the production process.

[0040] Filtration efficiency: Select a filtration device with appropriate filtration efficiency based on the air quality requirements of the place of use and the design standards of the ventilation system to ensure effective removal of target pollutants.

[0041] Resistance characteristics: Considering the resistance of the filter device, excessive resistance will increase the energy consumption and operating costs of the ventilation system, and affect the ventilation effect. Generally speaking, a filter device with lower resistance should be selected while meeting the filtration efficiency requirements.

[0042] Dust holding capacity: The larger the dust holding capacity, the longer the service life of the filter and the longer the replacement cycle. For environments with high dust content, a filter with a large dust holding capacity should be selected to reduce the frequency of replacement and maintenance costs.

[0043] Materials and Structure: Select appropriate materials and structures based on the usage environment and requirements. For example, in humid environments, corrosion-resistant materials should be selected; in situations requiring frequent cleaning, structures that are easy to disassemble and clean should be chosen.

[0044] Ventilation duct filtration devices offer numerous advantages, primarily in air purification, equipment protection, environmental optimization, and energy utilization. A detailed introduction follows:

[0045] Significant air purification effect: Highly efficient filtration of pollutants: It can effectively intercept and filter various pollutants in the air, from large particles of dust and hair to tiny pollen, bacteria, viruses and harmful gases. It can remove them in a targeted manner according to the different filtration precision devices, providing high-quality clean air for the indoor environment.

[0046] Improve air quality: It can significantly reduce the concentration of suspended particulate matter in the air, reduce the harm of inhalable particulate matter to the human respiratory system, and remove odors and harmful gases, making indoor air fresher and healthier, which helps to improve people's quality of life and work efficiency.

[0047] Protect ventilation system equipment: Reduce equipment wear: Prevent dust and other impurities from entering the ventilation system's fans, ducts, and air conditioning units, avoiding these impurities from causing wear on internal components such as impellers and bearings, thereby extending the equipment's service life and reducing maintenance and replacement costs.

[0048] Preventing duct blockage: Avoid the accumulation of dust and debris in ventilation ducts to prevent blockage, ensure smooth airflow in the ventilation system, maintain normal system operation, and reduce problems such as poor ventilation and increased energy consumption caused by duct blockage.

[0049] Optimize indoor environmental comfort: Reduce noise: While filtering the air, it can also absorb and reduce noise to a certain extent, reducing the noise generated by the ventilation system and creating a quieter and more comfortable indoor environment.

[0050] Stable temperature and humidity: By effectively filtering the air, the ventilation system can regulate the indoor temperature and humidity more evenly and stably, avoiding uneven indoor temperature and humidity caused by air impurities affecting heat exchange efficiency, thus improving the comfort of the indoor environment.

[0051] Improve energy efficiency: Reduce ventilation resistance: Keep ventilation ducts clean to reduce ventilation resistance caused by dust accumulation, allowing the ventilation system to operate at lower resistance, thereby reducing the energy consumption of the fan and achieving energy saving.

[0052] Improving heat exchange efficiency: Ensuring the cleanliness and efficient operation of air filters helps improve the heat exchange efficiency of heat exchange equipment such as air conditioning systems, enabling the equipment to utilize energy more effectively, reduce energy consumption, and lower energy costs.

[0053] Wide range of applications: Strong applicability: Different types and filtration precision filters can be selected according to different usage locations and needs, suitable for various industrial sites, commercial buildings, hospitals, schools, residences, etc., to meet the air quality requirements of different environments.

[0054] Please see Figure 1-5 As shown, this embodiment provides a filtration device for ventilation ducts, including: a ventilation duct 1, an annular filter groove is provided on the inner circumference of the ventilation duct 1, and an arc-shaped groove connected to the annular filter groove is provided on the side. An annular mounting frame is rotatably fitted inside the annular filter groove. An arc-shaped plate 4 is installed on the side of the annular mounting frame. The arc-shaped plate 4 is rotatably fitted inside the arc-shaped groove. A support ring plate 11 is provided on the inner circumference of the annular mounting frame. A filter screen 8 is placed on the support ring plate 11. A limiting component is installed on the side of the ventilation duct 1.

[0055] The limiting component includes a storage box 5 installed on the side of the ventilation duct 1. A gear 12 is rotatably fitted on one side of the inner wall of the storage box 5. One end face of the gear 12 is provided with an annular groove. An internal gear ring 15 is installed on the outer circumference of the annular groove. A movable frame is rotatably fitted on one side of the inner wall of the storage box 5. A connecting seat is elastically fitted on the movable frame. An external gear ring 16 is installed on one end face of the connecting seat. The external gear ring 16 is adapted to the internal gear ring 15. A rack 13 is elastically slidable on the lower side of the inner wall of the storage box 5. The gear 12 meshes with the rack 13. A pin 25 is installed on one side of the rack 13. One end of the pin 25 extends to the outside of the storage box 5. A semi-circular plate 26 is installed on the side of the arc plate 4. The pin 25 passes through the semi-circular plate 26 laterally.

[0056] A spring 24 is installed between the rack 13 and one side of the inner wall of the storage box 5, and the rack 13 is located between the spring 24 and the pin 25.

[0057] One application of this embodiment is as follows: When the filter screen 8 needs to be disassembled, cleaned, or replaced, first press the connecting seat to move the outer gear ring 16 towards the gear 12 until the outer gear ring 16 is inserted into the annular slot and meshes with the inner gear ring 15. At this time, rotate the connecting seat to drive the outer gear ring 16 and the movable frame to rotate. The rotation of the outer gear ring 16 drives the inner gear ring 15 and the gear 12 to rotate synchronously. The rotation of the gear 12 drives the rack 13 meshing with it to move towards the spring 24. The movement of the rack 13 drives the pin 25 to move synchronously, so that the pin 25 is pulled out from the semi-circular plate 26, and the pin 25 is removed from the arc plate 4. Then rotate the arc plate 4 to make the annular mounting bracket rotate out of the annular filter groove. At this time, release the connecting seat, and the connecting seat is pulled by the elastic force. The external gear ring 16 slides away from the gear 12 to reset, thereby disengaging the external gear ring 16 from the internal gear ring 15. The filter screen 8 is then removed from the support ring plate 11, completing the disassembly of the filter screen 8. After the new filter screen 8 is placed back on the support ring plate 11, the arc-shaped plate 4 is rotated in the opposite direction to reset, causing the semi-circular retaining plate 26 to press against the pin 25. The pin 25 is pressed into the storage box 5, and the sliding of the pin 25 pushes the rack 13 to slide synchronously. The rack 13 slides and presses against the spring 24, causing the gear 12 to rotate. When the arc-shaped plate 4 is fully rotated into the arc-shaped slot, the spring 24 rebounds, pushing the rack 13 and pin 25 to quickly reset, allowing the pin 25 to pass through the semi-circular retaining plate 26, thus achieving the limiting and fixing of the arc-shaped plate 4. It should be noted that all electrical equipment involved in this application can be powered by a battery or an external power source.

[0058] The movable frame facilitates the position adjustment of the connecting seat and the outer gear ring 16, while reducing the probability of the outer gear ring 16 being obstructed during rotation. The connecting seat slides elastically on the movable frame, making it easy to insert the outer gear ring 16 into the annular slot and engage with the inner gear ring 15. This allows the connecting seat to rotate, driving the pin 25 to slide and releasing the pin 25 from its limiting position on the semi-circular retaining plate 26, thus improving the ease of disassembling the filter screen 8. At the same time, when the connecting seat is released, the outer gear ring 16 and the inner gear ring 15 quickly disengage, allowing the semi-circular retaining plate 26 to rotate and press and displace the pin 25, reducing the probability of the rack 13 being obstructed during sliding and improving the ease of installing the filter screen 8.

[0059] like Figure 3 As shown, a support rod 14 is installed on one side of the inner wall of the storage box 5 in this embodiment. The gear 12 is rotatably engaged with the support rod 14. A stop is provided on one end face of the support rod 14. The gear 12 is located between the stop and the ventilation duct 1. The support rod 14 and the stop cooperate to support the gear 12 and reduce the probability of the gear 12 falling off the support rod 14 during rotation.

[0060] like Figure 3As shown, the connecting seat in this embodiment includes a support ring column 17, an external gear ring 16 is mounted on the end face of the support ring column 17 near the ventilation duct 1, two connecting blocks 18 are mounted on the side of the support ring column 17, the connecting blocks 18 are elastically fitted on the movable frame, a push rod 29 is mounted on the end face of the support ring column 17 away from the ventilation duct 1, the end of the push rod 29 away from the support ring column 17 extends to the outside of the storage box 5, a handle 21 is mounted on one side of the push rod 29, the handle 21 is located on the side of the storage box 5 away from the ventilation duct 1, the handle 21, the push rod 29 and the support ring column 17 cooperate to facilitate the rotation of the handle 21 to drive the push rod 29, the support ring column 17 and the external gear ring 16 to rotate synchronously, and at the same time cooperate with the connecting blocks 18 to facilitate the synchronous rotation of the movable frame.

[0061] like Figure 3 As shown, the storage box 5 in this embodiment has an annular groove 2 on one side of its inner wall. A bearing 23 is installed on the inner circumference of the annular groove 2. The movable frame is installed on the circumference of the bearing 23. The stability of the movable frame when it rotates is improved by the cooperation of the annular groove 2 and the bearing 23.

[0062] like Figure 3 As shown, the movable frame in this embodiment includes a connecting ring plate 22 mounted on the periphery of the bearing 23. The connecting ring plate 22 is rotatably fitted in the annular groove. Two connecting rods 19 are mounted on one end face of the connecting ring plate 22. The connecting rods 19 transversely pass through the connecting block 18. The push rod 29 and the external gear ring 16 are both located between the two connecting rods 19. Two springs 20 are mounted between the connecting block 18 and the connecting ring plate 22. The springs 20 are sleeved on the periphery of the corresponding connecting rods 19. The distance between the connecting rod 19 and the gear 12 is less than the thickness of the external gear ring 16, thereby reducing the probability of the connecting block 18 falling off the connecting rod 19. The connection of the connecting rod 19 and the connecting block 18 facilitates the rotation of the connecting block 18, which drives the connecting rod 19 and the connecting ring plate 22 to rotate synchronously. At the same time, it improves the stability of the support ring column 17 when sliding relative to the connecting ring plate 22. The springs 20 facilitate the pulling of the support ring column 17 and the external gear ring 16 for springback reset.

[0063] like Figure 4 As shown, in this embodiment, the pin 25 is provided with an arc-shaped block 9 on the side away from the rack 13, and the semi-circular plate 26 is provided with a through hole 1 in the horizontal direction. The through hole 1 passes through the semi-circular plate 26, and the pin 25 passes through the through hole 1. The through hole 1 facilitates the pin 25 to pass through the semi-circular plate 26, and the arc-shaped block 9 facilitates the rotation of the semi-circular plate 26 to squeeze and displace the pin 25, thereby reducing the friction between the semi-circular plate 26 and the pin 25, and at the same time, it facilitates the pin 25 to be aligned with the through hole 1 and inserted.

[0064] like Figure 2As shown, an annular baffle 10 is provided on the inner wall of the ventilation duct 1 in this embodiment. The filter screen 8 is located between the annular baffle 10 and the supporting ring plate 11. The annular baffle 10 and the supporting ring plate 11 cooperate to facilitate vertical positioning of the filter screen 8 and reduce the probability of displacement of the filter screen 8 in the ventilation duct 1.

[0065] like Figure 1 As shown, in this embodiment, the ventilation duct 1 is connected to both the upper and lower ends with corrugated pipes 2. A flange 3 is installed on one end of the corrugated pipe 2. The corrugated pipe 2 is located between the flange 3 and the ventilation duct 1. Through the telescoping function of the corrugated pipe 2, it is easy to connect to the exhaust port and air inlet at different distances, realizing the horizontal or vertical position compensation function and improving the applicability of the device. The flange 3 facilitates connection to the exhaust port and air inlet.

[0066] like Figure 5 As shown, in this embodiment, the ventilation duct 1 is equipped with two support plates 28 on its side, and a fixing rod is installed between the upper and lower support plates 28. A cylinder is rotatably fitted around the fixing rod, and an L-shaped connecting plate 27 is installed on the side of the cylinder. The L-shaped connecting plate 27 is installed on the side of the arc plate 4, and a handle 6 is installed on the side of the arc plate 4. The handle 6 is located between the L-shaped connecting plate 27 and the semi-circular clamping plate 26. The support plates 28 and the fixing rod cooperate to facilitate the support of the cylinder and the L-shaped connecting plate 27. The L-shaped connecting plate 27 facilitates the support of the arc plate 4. The cylinder and the fixing rod cooperate to improve the stability of the rotation of the arc plate 4, the annular mounting bracket and the support ring plate 11. The handle 6 facilitates the rotation of the arc plate 4.

[0067] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A filter device for ventilation ducts, characterized in that, include: Ventilation duct (1), the inner wall of ventilation duct (1) is provided with an annular filter groove and the side is provided with an arc-shaped slot connected to the annular filter groove. An annular mounting frame is rotatably fitted inside the annular filter groove. An arc-shaped plate (4) is installed on the side of the annular mounting frame. A support ring plate (11) is provided on the inner wall of the annular mounting frame. A filter screen (8) is placed on the support ring plate (11). A limiting component is installed on the side of ventilation duct (1). The limiting component includes a storage box (5) installed on the side of the ventilation duct (1). A gear (12) is rotatably fitted on one side of the inner wall of the storage box (5). An annular groove is provided on one end face of the gear (12). An internal gear ring (15) is installed on the outer circumference of the annular groove. A movable frame is rotatably fitted on one side of the inner wall of the storage box (5). A connecting seat is elastically fitted on the movable frame. An external gear ring (16) is installed on one end face of the connecting seat. A rack (13) is elastically slidable on the lower side of the inner wall of the storage box (5). The gear (12) meshes with the rack (13). A pin (25) is installed on one side of the rack (13). A semi-circular plate (26) is installed on the side of the arc plate (4). The pin (25) passes through the semi-circular plate (26) laterally.

2. A filtration device for ventilation ducts according to claim 1, characterized in that, A support rod (14) is installed on one side of the inner wall of the storage box (5). A gear (12) rotates and engages with the support rod (14). A stop block is provided on one end face of the support rod (14).

3. A filtration device for ventilation ducts according to claim 1, characterized in that, The connecting seat includes a support ring column (17), an external gear ring (16) is installed on the end face of the support ring column (17) near the ventilation duct (1), two connecting blocks (18) are installed on the side of the support ring column (17), the connecting blocks (18) are elastically fitted on the movable frame, and a push rod (29) is installed on the end face of the support ring column (17) away from the ventilation duct (1).

4. A filtration device for ventilation ducts according to claim 3, characterized in that, The storage box (5) has an annular groove on one side of its inner wall. A bearing (23) is installed on the inner circumference of the annular groove, and the movable frame is installed on the circumference of the bearing (23).

5. A filter device for ventilation ducts according to claim 4, characterized in that, The movable frame includes a connecting ring plate (22) installed around the bearing (23). Two connecting rods (19) are installed on one end face of the connecting ring plate (22). The connecting rods (19) pass through the connecting block (18) laterally. Two springs (20) are installed between the connecting block (18) and the connecting ring plate (22).

6. A filtration device for ventilation ducts according to claim 1, characterized in that, The pin (25) has an arc-shaped block (9) on the side away from the rack (13), and the semi-circular plate (26) has a through hole in the horizontal direction.

7. A filter device for ventilation ducts according to claim 1, characterized in that, The ventilation duct (1) has an annular baffle (10) on its inner wall.

8. A filter device for ventilation ducts according to claim 1, characterized in that, The ventilation duct (1) is connected to both the upper and lower ends with corrugated pipes (2), and a flange (3) is installed on one end of the corrugated pipe (2).

9. A filter device for ventilation ducts according to claim 1, characterized in that, The ventilation duct (1) is equipped with two support plates (28) on its side. A fixing rod is installed between the upper and lower support plates (28). A cylinder is rotatably fitted around the fixing rod. An L-shaped connecting plate (27) is installed on the side of the cylinder. The L-shaped connecting plate (27) is installed on the side of the arc plate (4).

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