Building ventilation pipeline anti-blocking device

Abstract

The utility model discloses a building ventilating duct anti-blocking device which comprises an air pipe body, at least two air pressure detection assemblies are further arranged on the air pipe body and arranged on the two sides of a filtering assembly, a storage box is arranged at the bottom of the air pipe body, the filtering assembly is installed in a first sliding groove, and the air pipe body is provided with a first air outlet. The bottom of the first sliding groove is communicated with the interior of the storage box, and a moving mechanism is further arranged at the bottom of the interior of the storage box and used for replacing the filter assemblies in the air pipe body. After detecting that the air pressure difference before and after the filter assembly exceeds a set value, the filter assembly in the air pipe main body is replaced by a new filter assembly in time through the moving mechanism, so that the problems that the existing filter assembly needs to be manually replaced regularly by a worker, the unblocked filter assembly is easy to check or clean, and the working efficiency is high are solved. And the working intensity and the labor cost are increased.

Description

Technical Field

[0001] This utility model relates to the field of air duct anti-blocking technology, specifically to an anti-blocking device for building ventilation ducts. Background Technology

[0002] Air duct is short for ventilation duct. It is a metal or non-metal pipe used in ventilation and air conditioning engineering of industrial and civil buildings. Ventilation duct is a municipal infrastructure that is used to facilitate air circulation and reduce the concentration of harmful gases. Ventilation duct is usually used to transport gas in order to achieve the effect of ventilation and air exchange.

[0003] Chinese utility model patent CN219607284U discloses an anti-clogging device for building ventilation ducts. The device involves installing a filter plate and a dust filter plate on a fixed frame, which is then installed on the duct. After a certain period of use, workers can remove the fixed frame and the filter structure from the duct together, replace it with a new filter structure, and reinstall it on the duct, thus preventing clogging. However, because workers often cannot visually determine whether clogging has occurred before regularly cleaning the filter structure, they may accidentally disassemble and clean non-clogging filter structures during manual inspection or cleaning, increasing workload and labor costs. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a device for preventing blockage of building ventilation ducts.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A building ventilation duct anti-clogging device includes a duct body, a filter assembly is provided on the inner side of the duct body, and an installation assembly is also provided on the filter assembly.

[0007] The duct body is also equipped with at least two air pressure detection components, which are located on both sides of the filter component to detect the pressure difference in the duct body before and after the filter component.

[0008] The installation assembly includes a storage box with a first opening at the top. The top of the storage box is connected to the bottom of the duct body. The bottom of the duct body has a first groove, which is located directly above the storage box. This forms a first storage cavity and a second storage cavity inside the storage box, which are used to hold the filter assembly before use and the filter assembly after use, respectively.

[0009] The filter assembly inside the duct body is installed in the first slide groove. The bottom of the first slide groove is connected to the inside of the storage box. The bottom of the storage box is also equipped with a moving mechanism for replacing the filter assembly inside the duct body.

[0010] Furthermore, the moving mechanism includes a first horizontal moving structure and a lifting structure disposed on the first horizontal moving structure for driving the filter assembly to move horizontally and vertically;

[0011] Both the first horizontal moving structure and the lifting structure are located inside the storage box, and a first detection component is also provided between the first horizontal moving structure and the storage box to detect the relative position between the lifting structure and the first slide.

[0012] A second detection component is also provided between the lifting structure and the filter component to align the lifting structure with the corresponding filter component and drive the filter component to move.

[0013] Furthermore, the storage box is equipped with a support structure that spans the first and second storage cavities to provide sliding support for the filter assembly.

[0014] The lifting structure includes a mounting base, which is set on the first horizontal moving structure. The mounting base is also provided with a telescopic structure. The top of the telescopic structure is provided with a connecting structure, which is inserted into the bottom of the filter assembly to drive the filter assembly to move.

[0015] Furthermore, the connecting structure includes a second lever with a top slot, the bottom of the second lever being fixedly connected to the top of the telescopic structure, and the top slot of the second lever being connected to the second detection component.

[0016] The bottom of the filter assembly has a slot, the width of which is adapted to the width of the second lever.

[0017] Furthermore, the support structure includes a partition, which is fixedly connected inside the storage box. The partition is located above the mounting base, and the height between the top of the partition and the main body of the air duct is the same as the vertical height of the filter assembly, which is used to limit and support the filter assembly.

[0018] Furthermore, a storage groove is provided on the top of the mounting base. The storage groove is located directly below the second lever and its shape is adapted to the shape of the second lever so that when the second lever moves to its lowest position, the bottom wall of the second lever contacts the bottom wall of the storage groove, and the top wall of the second lever is lower than the bottom wall of the filter assembly on the partition.

[0019] Furthermore, the mounting base is symmetrically fixedly connected to the first lever at the edge of the storage slot, and the top wall of the first lever is lower than the bottom wall of the filter assembly on the partition.

[0020] When the second lever is inserted into the filter assembly, the bottom wall of the second lever is lower than the top wall of the first lever, so that during horizontal movement, the filter assembly is moved by contact between the first lever and the second lever.

[0021] Furthermore, the filter assembly includes a mounting frame, and the inner wall of the mounting frame is provided with a filter structure;

[0022] The mounting frame is located inside the duct body and is installed to the duct body via a locking assembly;

[0023] The mounting frame is located on the inner wall of the storage box, and the inner wall of the storage box is slidably connected to the outer side of the mounting frame.

[0024] Furthermore, the locking assembly includes two second sealing covers, which are symmetrically fixedly connected to both sides of the duct body. An electromagnet is installed inside each second sealing cover, and a magnetic plate is installed on one side of each electromagnet. A rod is fixedly connected to one side of the magnetic plate. The end of the rod away from the magnetic plate passes through the corresponding second sealing cover and the side wall of the duct body in sequence. The end of the rod inside the duct body is inserted into the side wall of the mounting frame to lock and fix the mounting frame. 。

[0025] Compared with existing technologies, this anti-clogging device for building ventilation ducts has the following advantages:

[0026] This invention features a storage box located beneath the main body of the duct, divided into a first storage chamber and a second storage chamber. These chambers hold several pre- and post-use filter components, respectively. A pressure detection component detects when the pressure difference before and after the filter component exceeds a set value. A moving mechanism then promptly replaces the filter component in the duct with a new one. This eliminates the need for staff to periodically replenish the filter components and remove used ones, avoiding the need to disassemble unclogged or unnecessarily cleaned components. This solves the problem of existing methods requiring manual replacement of filters, which can lead to the need to check or clean even unclogged components, increasing workload and labor costs. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a cross-sectional view of the storage box of this utility model;

[0029] Figure 3 This is a cross-sectional view of the main body of the air duct of this utility model;

[0030] Figure 4 This is a three-dimensional structural diagram of the limiting frame of this utility model;

[0031] Figure 5 This is a cross-sectional view of the second sealing cover of this utility model;

[0032] Figure 6 This is a three-dimensional structural diagram of the first lever of this utility model.

[0033] In the diagram: 1. Main body of the duct; 2. Storage box; 3. Collection box; 4. Scraper; 5. Filter structure; 6. First sealing cover; 7. Limiting frame; 8. Mounting frame; 9. Magnetic strip; 10. Storage slot; 11. Telescopic structure; 12. Second sealing cover; 13. Magnetic plate; 14. Spring; 15. Electromagnet; 16. Limiting rod; 17. Insert rod; 18. Partition plate; 19. First lever; 20. Second lever. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] like Figure 1-6 As shown, this utility model provides a technical solution: a building ventilation duct anti-clogging device, including a duct body 1, a filter assembly is provided on the inner side of the duct body 1, and an installation assembly is also provided on the filter assembly; at least two air pressure detection assemblies are also provided on the duct body 1, and the two air pressure detection assemblies are located on both sides of the filter assembly, for detecting the pressure difference in the duct body 1 before and after the filter assembly; the installation assembly includes a storage box 2 with a first opening at the top, the top of the storage box 2 is connected to the bottom of the duct body 1, the bottom of the duct body 1 has a first sliding groove, and the first sliding groove is located directly above the storage box 2, forming a first storage cavity and a second storage cavity connected inside the storage box 2, for placing the filter assembly before use and the filter assembly after use, respectively; the filter assembly in the duct body 1 is installed in the first sliding groove, the bottom of the first sliding groove is connected to the inside of the storage box 2, and a moving mechanism is also provided at the bottom inside the storage box 2 for replacing the filter assembly in the duct body 1.

[0036] In use, along the horizontal section of the duct body 1, the air intake end is the front side. The front side of the storage box 2 is equipped with an opening and closing door, and corresponding latches and sealing rings are provided to maintain the airtightness of the storage box 2. The top of the storage box 2 is bolted to the bottom of the duct body 1, and a sealing ring is installed between them to improve the sealing effect. The air pressure detection component is a differential pressure gauge, located on both sides of the filter assembly, i.e., the front and rear sides. By detecting the air pressure before and after filtration and comparing the air pressure difference, it is used to determine whether the filter assembly is clogged. It is connected to the controller, which is used when the filter assembly needs to be adjusted. When replacing components, the filter assembly inside the duct body 1 is disassembled by the moving mechanism and moved to the second storage chamber. Then, a new filter assembly is moved from the first storage chamber and installed in the first slide groove to filter the airflow. The air pressure is detected by a barometer to determine if there is a blockage. The filter assembly that needs to be replaced is then replaced by the moving mechanism. This means that in subsequent work, only the personnel need to periodically remove the used filter assembly and clean the cleaned filter assembly. The storage box 2 is also equipped with a controller to coordinate and control the various electrical components.

[0037] The moving mechanism includes a first horizontal moving structure and a lifting structure disposed on the first horizontal moving structure for driving the filter assembly to move horizontally and vertically; both the first horizontal moving structure and the lifting structure are located inside the storage box 2, and a first detection component is also disposed between the first horizontal moving structure and the storage box 2 for detecting the relative position between the lifting structure and the first slide groove; a second detection component is also disposed between the lifting structure and the filter assembly to align the lifting structure with the corresponding filter assembly and drive the filter assembly to move.

[0038] In use, the first detection component can be a limit sensor, which is installed on the storage box 2 and the first horizontal moving structure respectively. It is triggered when the lifting structure moves to the center directly below the first slide groove to determine whether the lifting structure has moved to the center directly below the first slide groove, thereby starting to drive the filter component to move upward and gradually install the filter into the air duct body 1. The second detection component can be a laser range sensor, which is installed in the middle of the lifting structure and has a recessed marking part at the bottom of the filter component. When the lifting structure moves, the laser range sensor constantly detects the distance above. When the marking part is detected, i.e., the set distance, the controller controls the lifting structure to move upward and connect with the filter component, thereby cooperating with the first horizontal moving structure to drive the filter component to move.

[0039] The storage box 2 has an internal support structure that spans the first and second storage cavities and is used to slide the filter assembly. The lifting structure includes a mounting base that is mounted on the first horizontal moving structure. The mounting base also has a telescopic structure 11. The top of the telescopic structure 11 has a connecting structure that is inserted into the bottom of the filter assembly to drive the filter assembly to move.

[0040] In use, the telescopic structure 11 uses an electric telescopic push rod to drive the filter assembly to move up and down. The first horizontal moving structure includes a threaded rod, the two ends of which are rotatably connected to the inner wall of the storage box 2. One end of the threaded rod extends through the side wall of the storage box 2 to the outside and is fixedly connected to the output end of the motor. The motor is a forward and reverse motor and is fixedly installed on the outside of the storage box 2. A limiting rod is also fixedly connected to the inner wall of the storage box 2. The limiting rod passes through the mounting seat, allowing the mounting seat to slide on the limiting rod and restricting the rotation of the mounting seat. The mounting seat and the threaded rod are threadedly connected. The motor drives the threaded rod to rotate, causing the threaded rod to drive the mounting seat to slide back and forth along the axis of the threaded rod. Then, the mounting seat further drives the electric telescopic push rod to move. The second detection component moves the electric telescopic push rod to the appropriate position. Then, the lifting and lowering of the telescopic push rod connects the top connecting structure with the corresponding filter assembly, and then drives the filter assembly to move.

[0041] The connecting structure includes a second lever 20 with a top slot, the bottom of which is fixedly connected to the top of the telescopic structure 11, and the second detection component is connected to the top slot of the second lever 20. The bottom of the filter component has a slot, the width of which is adapted to the width of the second lever 20. In use, a recessed marking part is set in the slot and corresponds to the second detection component below. The second detection component detects the relative position of the telescopic structure 11 and the filter component, so that the telescopic structure 11 can drive the second lever 20 to be inserted into the slot. Then, when the telescopic structure 11 moves horizontally, the second lever 20 and the slot can further drive the filter component to move horizontally.

[0042] The support structure includes a partition 18, which is fixedly connected inside the storage box 2. The partition 18 is located above the mounting base. The height between the top of the partition 18 and the main body of the duct is the same as the vertical height of the filter assembly, which is used to limit and support the filter assembly. In use, the top of the filter assembly presses against the top of the main body of the duct, while the bottom is slidably connected to the partition 18, allowing the filter assembly to slide between the bottom of the main body of the duct and the top of the partition 18. The top of the partition 18 is also fixedly connected to an upwardly protruding slide rail, and a corresponding second slide groove is provided below the filter assembly. The filter assembly slides on the slide rail through the second slide groove, further improving the stability of the slide.

[0043] The top of the mounting base has a storage groove 10, which is located directly below the second lever 20 and is shaped to match the shape of the second lever 20. When the second lever 20 moves to its lowest position, the bottom wall of the second lever 20 contacts the bottom wall of the storage groove 10, and the top wall of the second lever 20 is lower than the bottom wall of the filter assembly on the partition 18. The mounting base is symmetrically fixedly connected to the first lever 19 at the edge of the storage groove 10. The top wall of the first lever 19 is lower than the bottom wall of the filter assembly on the partition 18. When the second lever 20 is inserted into the filter assembly, the bottom wall of the second lever 20 is lower than the top wall of the first lever 19, so that during horizontal movement, the filter assembly is moved by the contact between the first lever 19 and the second lever 20.

[0044] During use, the filter assembly is in contact with the partition 18 and the duct body 1 at all planes, and the top and bottom surfaces of the filter assembly are oriented in the same direction, which helps to limit the tilting of the filter assembly; by pushing the second lever 20 with the first lever 19, the lateral force on the telescopic structure 11 is reduced during horizontal movement, thus protecting the telescopic structure 11.

[0045] The filter assembly includes a mounting frame 8, with a filter structure 5 installed on its inner wall; the mounting frame 8 is located inside the duct body 1 and is installed to the duct body 1 via a locking assembly; the mounting frame 8 is located on the inner wall of the storage box 2, with the inner wall of the storage box 2 slidably connected to the outer side of the mounting frame 8; several magnetic strips 9 are fixedly embedded on both inner side walls of the storage box 2, and the side of the magnetic strips 9 away from the storage box 2 is coplanar with the side wall of the storage box 2; several magnetic blocks corresponding to the magnetic strips 9 are provided on the outer side of the mounting frame 8, and the sides of the magnetic blocks that contact the magnetic strips 9 attract each other; in use, the filter structure 5 can be composed of a filter plate and a dust filter plate, with the magnetic strips 9 distributed at equal intervals from top to bottom, and the side of the mounting frame 8 contacts the magnetic strips 9 through the magnetic blocks, increasing the friction between the mounting frame 8 and the storage box 2, so that the mounting frame 8 can remain stable.

[0046] The locking assembly includes two second sealing covers 12, which are symmetrically fixedly connected to both sides of the duct body 1. An electromagnet 15 is installed inside the second sealing cover 12. A magnetic plate 13 is installed on one side of the electromagnet 15. A plug rod 17 is fixedly connected to one side of the magnetic plate 13. The end of the plug rod 17 away from the magnetic plate 13 passes through the corresponding second sealing cover 12 and the side wall of the duct body 1 in sequence. The end of the plug rod 17 inside the duct body 1 is inserted into the side wall of the mounting frame 8 to lock and fix the mounting frame 8. In use, the side of the plug rod 17 near the mounting frame 8 is inclined. The magnetic plate 13 is slidably sleeved on the limiting rod 16. One end of the limiting rod 16 contacts the outside of the side wall of the duct body 1, and the other end is fixedly connected to the corresponding second sealing cover 12. A spring 14 is also provided between the magnetic plate 13 and the second sealing cover 12 and is sleeved on the limiting rod 16.

[0047] Two limiting frames 7 are symmetrically fixedly connected inside the duct body 1, and are symmetrically arranged on both sides of the corresponding mounting frame 8. This ensures that when the telescopic structure 11 pushes the mounting frame 8 upward into the duct body 1, the mounting frame 8 is restricted by the limiting frames 7, improving its stability. A sealing ring is provided at the contact point between the two frames to enhance the sealing effect. When locking the mounting frame 8, the telescopic structure 11 pushes the mounting frame 8 upward, causing the top of the mounting frame 8 to push the insertion rod 17 through the inclined surface, thereby moving the magnetic plate 13. The magnetic plate 13 compresses the spring 14. Then, when the mounting frame 8 reaches its highest point, several holes on the mounting frame 8 correspond exactly to several insertion rods 17, allowing the insertion rods to be inserted... The rod 17 is inserted into the mounting frame 8 to lock the mounting frame 8 and prevent it from falling downwards. When disassembling the mounting frame 8, the second lever 20 is first inserted into the bottom of the mounting frame 8 to prevent it from falling freely. The controller operates the electromagnet 15, which pulls the magnetic plate 13, further moving the rod 17 away from the mounting frame 8, releasing the lock on the mounting frame 8, and causing the second lever 20 to move downwards. The mounting frame 8 moves downwards under gravity, following the second lever 20. To prevent jamming, the part of the second lever 20 that contacts the mounting frame 8 is made magnetic or Velcro is added to make the second lever 20 pull the mounting frame 8 downwards.

[0048] The inner wall of the duct body 1 is also provided with a scraper 4. The top of the scraper 4 is provided with a second horizontal moving structure for driving the scraper 4 to move. The scraper 4 is located on the side of the air intake of the filter component. The two opposite side walls of the duct body 1 are provided with second openings. The outer side of the duct body 1 is symmetrically and detachably connected with a collection box 3, and the collection box 3 is connected to the second opening so that the scraper 4 pushes the dust into the collection box 3. In use, the second horizontal moving structure can be used in the same way as the first horizontal moving structure, through the cooperation of the threaded rod and the limiting rod to drive the scraper 4 to move. Alternatively, an electric telescopic push rod can be used to drive the scraper 4 to reciprocate. The outer side of the top of the scraper 4 is provided with a first sealing cover 6 to prevent leakage of the groove between the duct body 1 and the scraper 4.

[0049] In the initial state, by opening the door on one side of the storage box 2, several mounting frames 8 are placed into the first storage cavity inside the storage box 2 along the partition 18. The first storage cavity is located on the side away from the door. Then, the second lever 20 is moved to the bottom of the first mounting frame 8 by the first horizontal moving structure (the distance between the second lever 20 and the first slide groove is from near to far, namely the first mounting frame 8 and the second mounting frame 8). Then, the second lever 20 is moved upward a suitable distance and inserted into the bottom of the first mounting frame 8. Then, it is moved horizontally again to push the first mounting frame 8 to the bottom of the first slide groove. The first mounting frame 8 is further pushed upward by the telescopic structure 11 and inserted into the air duct body 1. It is locked by the locking component to realize the installation of the first mounting frame 8. Then, the second lever 20 is lowered into the storage slot 10.

[0050] When the filter structure 5 in the first mounting frame 8 becomes clogged and needs to be replaced, insert the second lever 20 back into the bottom of the first mounting frame 8, then release the lock on the first mounting frame 8. Then lower the second lever 20 so that the first mounting frame 8 moves downward onto the partition 18, and then moves horizontally to move the first mounting frame 8 into the second storage cavity. After the first mounting frame 8 has been moved to the designated position, move the second lever 20 downward to disengage from the first mounting frame 8. Then move the second mounting frame 8 from below into the air duct body 1. Repeat this process to replace the filter structure 5 in the air duct body 1 in a timely manner.

Claims

1. A building ventilation duct anti-clogging device, comprising a duct body (1), wherein a filter assembly is disposed on the inner side of the duct body (1), and an installation assembly is further disposed on the filter assembly, characterized in that: The air duct body (1) is also provided with at least two air pressure detection components, and the two air pressure detection components are arranged on both sides of the filter component to detect the pressure difference in the air duct body (1) before and after the filter component. The installation assembly includes a storage box (2) with a first opening at the top. The top of the storage box (2) is connected to the bottom of the duct body (1). The bottom of the duct body (1) is provided with a first sliding groove, and the first sliding groove is located directly above the storage box (2). The storage box (2) forms a first storage cavity and a second storage cavity that are connected to each other, which are used to place the filter assembly before use and the filter assembly after use, respectively. The filter assembly inside the duct body (1) is installed in the first slide groove. The bottom of the first slide groove is connected to the interior of the storage box (2). The bottom of the storage box (2) is also provided with a moving mechanism for replacing the filter assembly inside the duct body (1).

2. The anti-clogging device for building ventilation ducts according to claim 1, characterized in that: The moving mechanism includes a first horizontal moving structure and a lifting structure disposed on the first horizontal moving structure, for driving the filter component to move horizontally and vertically. Both the first horizontal moving structure and the lifting structure are located inside the storage box (2), and a first detection component is also provided between the first horizontal moving structure and the storage box (2) for detecting the relative position between the lifting structure and the first slide groove; A second detection component is also provided between the lifting structure and the filter component, so that the lifting structure is aligned with the corresponding filter component and the filter component is driven to move.

3. The anti-clogging device for building ventilation ducts according to claim 2, characterized in that: The storage box (2) is provided with a support structure inside, which spans the first storage cavity and the second storage cavity and is used to slide support the filter assembly; The lifting structure includes a mounting base, which is disposed on a first horizontal moving structure. The mounting base is also provided with a telescopic structure (11). The top of the telescopic structure (11) is provided with a connecting structure. The telescopic structure (11) is inserted into the bottom of the filter assembly to drive the filter assembly to move.

4. The anti-clogging device for building ventilation ducts according to claim 3, characterized in that: The connection structure includes a second paddle (20) with a top slot, the bottom of the second paddle (20) being fixedly connected to the top of the telescopic structure (11), and the second detection component being connected to the top slot of the second paddle (20). The bottom of the filter assembly has a slot, the width of which is adapted to the width of the second lever (20).

5. The anti-clogging device for building ventilation ducts according to claim 4, characterized in that: The support structure includes a partition (18), which is fixedly connected inside the storage box (2). The partition (18) is located above the mounting base. The height between the top of the partition (18) and the air duct body (1) is the same as the vertical height of the filter assembly, and is used to limit and support the filter assembly.

6. The anti-clogging device for building ventilation ducts according to claim 5, characterized in that: The top of the mounting base is provided with a storage groove (10), which is located directly below the second lever (20) and is shaped to match the shape of the second lever (20) so that when the second lever (20) moves to its lowest position, the bottom wall of the second lever (20) contacts the bottom wall of the storage groove (10), and the top wall of the second lever (20) is lower than the bottom wall of the filter assembly on the partition (18).

7. The anti-clogging device for building ventilation ducts according to claim 6, characterized in that: The mounting base is symmetrically fixedly connected to a first lever (19) at the edge of the storage slot (10), and the top wall of the first lever (19) is lower than the bottom wall of the filter assembly on the partition (18). When the second lever (20) is inserted into the filter assembly, the bottom wall of the second lever (20) is lower than the top wall of the first lever (19) so that the filter assembly is pushed to move by the contact between the first lever (19) and the second lever (20) during horizontal movement.

8. The anti-clogging device for building ventilation ducts according to claim 1, characterized in that: The filter assembly includes a mounting frame (8), and the inner wall of the mounting frame (8) is provided with a filter structure (5); The mounting frame (8) is located inside the duct body (1), and the mounting frame (8) is installed with the duct body (1) by a locking assembly; The mounting frame (8) is located on the inner wall of the storage box (2), and the inner wall of the storage box (2) is slidably connected to the outer side of the mounting frame (8).

9. The anti-clogging device for building ventilation ducts according to claim 8, characterized in that: The locking assembly includes two second sealing covers (12), which are symmetrically fixedly connected to both sides of the air duct body (1). An electromagnet (15) is provided inside the second sealing cover (12). A magnetic plate (13) is provided on one side of the electromagnet (15). A plug rod (17) is fixedly connected to one side of the magnetic plate (13). The end of the plug rod (17) away from the magnetic plate (13) passes through the corresponding second sealing cover (12) and the side wall of the air duct body (1) in sequence. The end of the plug rod (17) inside the air duct body (1) is inserted into the side wall of the mounting frame (8) to lock and fix the mounting frame (8).

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