A dustproof valve for ventilation ducts

Abstract

This invention discloses a dustproof valve for a ventilation duct, comprising a valve device, a louvered cover connected to the front of the valve device, a rear dust collection frame connected to the rear of the valve device, a valve shell disposed inside the valve device, a driving device installed on the outer wall of the valve shell, an even number of valve guide blocks installed inside the valve shell, and a valve body disposed between the even number of valve guide blocks. This invention utilizes the driving device to actuate the valve body when it is opened, causing it to open 135° and then return to a 90° horizontal ventilation state. This allows the lower top sealing plate to lift the slide frame connected to the top rod on the side slide rail by the same degree and then simultaneously return it to its original position. During the lifting and resetting process, the dustproof net inside the dustproof net roll is stretched, causing the net to work with the cleaning component to form a brush, allowing the dust adhering to the surface of the net to fall off and be collected in the collection box. This achieves dust cleaning of the dustproof net without disassembly, ensuring the normal operation of the airflow and ventilation system during long-term use.

Description

Technical Field

[0001] This invention relates to the field of valve body technology, specifically a dustproof valve for ventilation ducts. Background Technology

[0002] Ventilation duct valves are key components of ventilation systems, primarily used to regulate airflow. Their core functions include: adjusting air volume by controlling the opening degree to match ventilation demand; controlling airflow direction, with some valves guiding airflow along a set path; and blocking or opening ventilation paths, such as isolating abnormal airflow areas when closed to prevent the spread of odors and pollutants, ensuring efficient and stable system operation.

[0003] However, the existing technology has the following shortcomings: the dust prevention of the existing ventilation duct valves is generally achieved by using a dustproof insert plate to be installed and fixed inside the valve body. This means that after a certain period of use, the valve needs to be disassembled, the dustproof plate or dustproof mesh frame needs to be removed for cleaning and then reinstalled. However, the dustproof plate that has not been cleaned for a long time is more likely to attract dust and other foreign objects due to the dust on its surface, which will block the mesh and reduce the ventilation volume. In addition, the valve body needs to be stopped during the disassembly process, which will affect the normal operation of the ventilation system. Summary of the Invention

[0004] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and other accompanying drawings.

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a dustproof valve for ventilation ducts. Each time the valve is opened, the built-in valve body triggers the dustproof net on the dust collection frame to clean the dustproof net. This effectively prevents dust from sticking and accumulating on the dustproof net each time the valve is opened, and allows the dustproof net to be cleaned without disassembly, ensuring the normal operation of the air volume and ventilation system.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a dustproof valve for a ventilation duct, comprising a valve device, a louvered cover connected to the front of the valve device, a rear dust collection frame connected to the rear of the valve device, a valve housing disposed within the valve device, a driving device mounted on the outer wall of the valve housing, an even number of valve guide blocks installed within the valve housing, a valve body disposed between the even number of valve guide blocks, and an even number of valve body sealing side blocks disposed at both the front and rear of the valve body; a frame body disposed within the rear dust collection frame, the frame body being lowered... The frame is equipped with a collection box. A dustproof net roll is fixed on the inner surface of the upper part of the frame. An even number of auxiliary net rails are connected to the bottom of the dustproof net roll. A guide roll is provided at the end of the auxiliary net rails. A cleaning component is provided behind the guide roll. A through groove is opened between the guide roll and the cleaning component. A grooved guide block is provided in the valve guide block. An arc-shaped guide rail is connected to the end of the valve guide block. A connecting top rod is installed on one of the arc-shaped guide rails. A slide is fixed to the top of the arc-shaped guide rail. Side slide rails are provided at both ends of the slide.

[0007] A further improvement to the present invention is that the dustproof net roll has a built-in dustproof net, and both ends of the dustproof net are hollowed out. The dustproof net inside the dustproof net roll passes through the auxiliary net rail and the guide roll in sequence and is then fixed on the slide. The slide is driven to move by the connecting top rod, which is driven by the valve body. Both ends of the slide are slidably engaged with the side slide rail. The arc-shaped guide rail is used for limiting and sliding engagement with the arc-shaped guide rail. The cleaning component cooperates with the dustproof net on the dustproof net roll.

[0008] In a further improvement to the present invention, a drive shaft is provided in the valve body, an even number of valve discs are mounted on the drive shaft, a plurality of embedded spring sleeves are mounted on the valve discs, a lower top sealing plate is nested inside the valve discs, and an adapter plate is mounted on one surface of the valve discs.

[0009] In a further improvement to the present invention, the upper fitting plate is adapted to the sealing side block of the valve body, the lower top sealing plate is fixed by the embedded spring sleeve, the protrusion of the lower top sealing plate is fixed to the connecting top rod, the drive shaft cooperates with the drive device, and the lower top sealing plate is abutted against the grooved guide block and the arc-shaped guide rail.

[0010] In a further improvement to the present invention, the cleaning component is provided with an inclined guide block, an even number of fixing frames are fixed on the surface of the inclined guide block, a connecting rod rotating frame is installed on the inner wall of the fixing frame, an even number of nested rods are connected to the connecting rod rotating frame, and an elastic tension rod is installed between each of the even number of nested rods, and an in-slot slide rail is provided in the through slot.

[0011] In a further improvement to the present invention, the inclined guide block is used to guide the dust of the dustproof net on the dustproof net roll, and a cleaning brush and a cleaning brush can be installed on the nested rod respectively. The lower part of the nested rod is directly opposite the through groove, and the lower part of the through groove is directly opposite the through groove. The through groove is engaged with the frame.

[0012] In a further improvement to the present invention, top frames are installed on both sides of the outer wall of the valve housing, a connecting rod cylinder is fixed on the outer wall of the top frame, and a tension rod is connected to both the connecting rod cylinder and the upper surface of the valve housing. The driving device is located inside the top frame.

[0013] In a further improvement to the present invention, a drive wheel is provided inside the drive device, a driven wheel is provided below the drive wheel, and a transmission belt connects the driven wheel and the drive wheel.

[0014] In a further improvement to the present invention, the driven wheel is connected to the valve body, the driving device consists of a motor and a controller, and the connecting rod cylinder and the valve shell are both suspended by the tension rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects;

[0016] 1. This invention utilizes a drive device to open the valve body, causing it to open 135° and then return to a 90° horizontal ventilation state. This allows the lower top sealing plate to lift the slide frame connected to the top rod on the side slide rail by the same degree and then return it to its original position. During the lifting and resetting process, the dustproof net inside the dustproof net roll is stretched, causing the net to work with the cleaning component to form a brush. This allows the dust adhering to the surface of the net to fall off and be collected in the collection box, thus achieving dust cleaning of the dustproof net without disassembly. This ensures the normal operation of the airflow and ventilation system during long-term use.

[0017] 2. With the cooperation of the grooved guide block and the arc-shaped guide rail, the lower top sealing plate of this invention can be continuously moved and fixed. When closed, the grooved block keeps the lower top sealing plate in contact with the surface of the grooved block, while the valve body sealing side blocks on both sides achieve the sealing of the valve body. The valve disc is fitted with the valve disc adapter plate on both sides to prevent air leakage when the valve is closed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a dustproof valve for a ventilation duct according to the present invention;

[0019] Figure 2 This is a rear view schematic diagram of the valve device in a ventilation duct dustproof valve according to the present invention;

[0020] Figure 3This is a bottom view of the dust collection frame in a ventilation duct dustproof valve according to the present invention.

[0021] Figure 4 This is a front view schematic diagram of the guide block inside the valve in a dustproof valve for a ventilation duct according to the present invention;

[0022] Figure 5 This is a rear view schematic diagram of the valve body in a ventilation duct dustproof valve according to the present invention;

[0023] Figure 6 This is a three-dimensional structural diagram of a through groove in a ventilation duct dustproof valve according to the present invention;

[0024] Figure 7 This is a front view schematic diagram of the valve body in a dustproof valve for a ventilation duct according to the present invention;

[0025] Figure 8 This is a side sectional view of a dustproof valve for a ventilation duct according to the present invention.

[0026] Figure 9 for Figure 8 A magnified three-dimensional structural diagram of part A in the middle;

[0027] Figure 10 This is a schematic diagram of the inner dustproof net of the dustproof net roll in a ventilation duct dustproof valve according to the present invention.

[0028] In the diagram: Valve assembly-1, Louvered cover-2, Rear dust collection frame-3, Valve housing-11, Top frame-12, Pull rod-13, Drive unit-14, Inner valve guide block-15, Connecting rod cylinder-16, Valve body-17, Valve body sealing side block-18, Frame-31, Collection box-32, Dustproof net roll-up-33, Auxiliary net rail-34, Guide roll-up-35, Cleaning assembly-36, Through slot-37, Drive wheel-141, Transmission belt-142 Driven wheel-143, grooved guide block-151, arc-shaped guide rail-152, connecting top rod-153, slide-carriage-154, side slide rail-155, drive shaft-171, valve disc-172, embedded spring cylinder-173, lower top sealing plate-174, inclined guide block-361, fixed frame-362, nested rod-363, elastic tension rod-364, connecting rod rotating frame-365, grooved slide rail-371, disc adapter plate-1721. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0030] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies are not connected through a transitional structure, but rather formed as a whole through a connecting structure. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The present invention will be further described below with reference to the accompanying drawings: Example 1

[0034] As attached Figure 1 To be continued Figure 8 As shown:

[0035] This embodiment provides a dustproof valve for a ventilation duct, including a valve device 1, a louvered cover 2 connected to the front of the valve device 1, a rear dust collection frame 3 connected to the rear of the valve device 1, a valve shell 11 disposed inside the valve device 1, a drive device 14 installed on the outer wall of the valve shell 11, an even number of valve guide blocks 15 installed inside the valve shell 11, a valve body 17 disposed between the even number of valve guide blocks 15, an even number of valve body sealing side blocks 18 disposed at both the front and rear of the valve body 17, and top frames 12 installed on both sides of the outer wall of the valve shell 11. A connecting rod cylinder 16 is fixed to the outer wall of the valve housing 11, and tension rods 13 are connected to the upper surfaces of both the connecting rod cylinder 16 and the valve housing 11. A frame 31 is installed inside the dust collection frame 3, and a collection box 32 is installed below the frame 31. A dustproof net roll 33 is fixed to the inner surface of the upper part of the frame 31. An even number of auxiliary net rails 34 are connected below the dustproof net roll 33. A guide roll 35 is installed at the end of the auxiliary net rails 34, and a cleaning component 36 is installed behind the guide roll 35. A through groove 37 is provided between the guide roll 35 and the cleaning component 36. A drive wheel 141 is installed inside the drive device 14, and a driven wheel 143 is installed below the drive wheel 141. A transmission belt 142 connects the driven wheel 143 and the drive wheel 141. The valve inner guide block 15 is provided with a grooved guide block body 151. The end of the valve inner guide block 15 is connected to an arc-shaped guide rail 152. One of the arc-shaped guide rails 152 is equipped with a connecting top rod 153. A slide 154 is fixed to the top of the arc-shaped guide rail 152. Both ends of the slide 154 are provided with side slide rails 155. The valve body 17 is provided with a drive shaft 171. An even number of valve discs 172 are installed on the drive shaft 171. Several embedded spring cylinders 173 are installed on the valve discs 172. A lower top sealing plate 174 is nested inside the valve discs 172. A groove slide rail 371 is opened in the through groove 37. A disc adapter plate 1721 is installed on one surface of the valve disc 172.

[0036] Furthermore, when the drive device 14 is turned on, under the control of the motor and controller, the valve disc 172 swings from the vertical 0° state to ±135° and then returns to the 90° state.

[0037] Furthermore, at least two grooved guide blocks 151 are provided, which are arc-shaped blocks with grooves in the middle. The grooves are used to assist sliding in conjunction with the protrusions in the center of the lower top sealing plate 174.

[0038] Furthermore, the arc-shaped guide rail 152 is connected to the end of the grooved guide block 151 to assist the protrusion in the center of the lower top sealing plate 174 in limiting and assisting the sliding after extending out of the grooved guide block 151. The connecting top rod 153 is installed between the slots of the arc-shaped guide rail 152 and is fixed and slid by the lower top sealing plate 174.

[0039] Furthermore, the slide 154 is mainly installed on the inner wall of the valve body 11. When the connecting rod 153 is fixed by the lower top sealing plate 174, it rises together, thereby cooperating with the side slide rail 155 to complete the up and down sliding work. When the connecting rod 153 rises, it can complete the corresponding adaptation extension or contraction through its own nesting structure.

[0040] Furthermore, the arc-shaped guide rail 152 is designed in two sets, which are the same as the grooved guide block 151 and are installed at opposite angles. However, the arc-shaped guide rail 152 near its louver cover 2 is not equipped with the connecting top rod 153, slide 154, and side slide rail 155.

[0041] Furthermore, at least two valve discs 172 are provided, and the two discs are installed in opposite directions on the surface of the drive shaft 171. Each disc is equipped with an adapter plate 1721, which is used to seal the valve body sealing side block 18 when the disc is reset to a vertical closed state.

[0042] Furthermore, several embedded spring sleeves 173 are installed on the surface of the valve disc 172, and the springs in the embedded spring sleeves 173 are always pressed against the surface of the lower top sealing plate 174, so that when it is reset, it is always in contact with the surface of the grooved guide block 151 for sealing.

[0043] The specific working principle is as follows:

[0044] This invention involves installing the valve device 1 at a designated location, bolting a louvered cover 2 to the front to cover the valve device 1, and then connecting it to a dust collection frame 3 at the rear. Finally, it is fixed to the ventilation duct. The top frame 12 of the valve housing 11's side wall abuts against the inner wall of the wall. A tension rod 13 is connected to the valve housing and connecting rod cylinder 16 to form a suspension. When the drive device 14 is activated, the drive shaft 171 inside the valve body 17 drives the valve disc 172 from a vertical 0° position, rotating it 135° positive and negative, and then returning it to a 90° horizontal position. During the rotation of the valve disc 172, the lower top sealing plate 174 moves within the grooved guide block 151, and the rear... With the cooperation of the arc-shaped guide rail 152, the connecting rod 153 and the slide 154 are synchronously lifted on the side slide rail 155, stretching the dustproof net inside the dustproof net roll 33 inside the frame 31. The cleaning component 36 cleans the surface of the dustproof net, allowing the dust on the dustproof net to fall into the collection box 32 after falling through the through groove 37. When the use ends, the valve body 17 is triggered to close by the drive device 14, allowing the lower top sealing plate 174 to retract into the grooved guide block 151. At the same time, the embedded spring cylinder 173 continues to push and close, sealing the valve disc 173. The adapter plate 1721 on the disc engages with the valve body sealing side block 18, achieving a high sealing effect. Example 2

[0045] As attached Figure 3 Appendix Figure 6and appendix Figure 9-10 As shown:

[0046] The rear dust collection frame 3 includes a frame 31, with a collection box 32 installed below it. A dustproof net roll 33 is fixed to the inner surface of the frame 31. An even number of auxiliary net rails 34 are connected below the dustproof net roll 33. A guide roll 35 is installed at the end of the auxiliary net rails 34. A cleaning component 36 is installed behind the guide roll 35. A through groove 37 is provided between the guide roll 35 and the cleaning component 36. An inclined guide block 361 is installed inside the cleaning component 36. An even number of fixing brackets 362 are fixed to the surface of the inclined guide block 361. A connecting rod rotating bracket 365 is installed on the inner wall of the fixing bracket 362. An even number of nested rods 363 are connected to the connecting rod rotating bracket 365. An elastic tension rod 364 is installed between each of the even number of nested rods 363. An in-slot slide rail 371 is provided in the through groove 37.

[0047] Furthermore, the collection box 32 is mainly engaged with the frame 31, and its top is directly opposite the through slot 37. With the cooperation of the cleaning component 36, dust can be introduced into the collection box 32 for collection.

[0048] Furthermore, the dustproof net roll 33 has a built-in dustproof net. The two ends of the dustproof net are hollowed out, the middle section is a net body, and the sides of the dustproof net are edged with rubber strips, which facilitates movement within the auxiliary net rail 34, the guide roll 35 and the through groove 37.

[0049] Furthermore, the open ends of the dustproof net inside the dustproof net roll 33 mainly facilitate the dust to fall into the collection box 32 for collection after the dust is cleaned on the surface of the net by the cleaning component 36.

[0050] Furthermore, the guide drum 35 is equipped with two auxiliary rods, which assist in the repositioning of the dustproof net and ensure smoother and more stable operation when the dustproof net is stretched.

[0051] Furthermore, the inclined guide block 361 is in an inclined state and is fixed to the inner surface of the frame 31, penetrating one side of the slot 37. The surface of the inclined guide block 361 is fixed by the fixing bracket 362, which, together with the connecting rod rotating bracket 365, completes the installation of the nested rod 363.

[0052] Furthermore, a spring-loaded tension rod 364 is installed between the nested rods 363. The spring-loaded tension rod 364 is mainly retracted under pressure and nested in the nested rods 363, thereby facilitating the installation and replacement of the cleaning brush and the cleaning brush.

[0053] The specific working principle is as follows:

[0054] This invention uses the collection box 32 below the frame 31 to engage, allowing the dustproof net in the dustproof net roll 33 to engage with the auxiliary net rail 34 and the guide roll 35, and then pass through the slide rail 371 in the through groove 37, with the end fixed to the slide frame. When the valve body is triggered, the slide frame and the dustproof net are lifted, pulling the dustproof net. As it rises, a cleaning brush mounted on the connecting rod rotating frame 365 on the surface of the inclined guide block 361 wiping the dustproof net surface, causing the dustproof net to fall off. The dust is guided by the inclined guide block 361, allowing it to fall into the through groove 37 and enter the collection box 32 for collection. The cleaning brush on the other nested rod 363 works in conjunction with the cleaning brush on the nested rod 363 to keep the cleaning brush clean and extend its service life. The dust cleaned by the cleaning brush falls into the collection box 32. When the cleaning brush and the cleaning brush need to be replaced, the elastic tension rod 364 is removed by moving it, which separates the nested rod 363 in the middle. The two can then be replaced or cleaned and reinstalled for use.

[0055] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0056] The term "embodiment" in this specification means that a specific feature or characteristic described in connection with an embodiment is included in at least one embodiment of the invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0057] Furthermore, the described features or characteristics can be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented without the aforementioned specific details or may be implemented using other methods, components, materials, etc.

Claims

1. A dustproof valve for a ventilation duct, characterized in that, The device includes a valve assembly (1), a louvered cover (2) connected to the front of the valve assembly (1), a rear dust collection frame (3) connected to the rear of the valve assembly (1), a valve housing (11) provided inside the valve assembly (1), a drive device (14) installed on the outer wall of the valve housing (11), an even number of valve guide blocks (15) installed inside the valve housing (11), a valve body (17) provided between the even number of valve guide blocks (15), and an even number of valve body sealing side blocks (18) provided at both the front and rear of the valve body (17). The rear dust collection frame (3) is provided with a frame body (31), a collection box (32) is installed below the frame body (31), a dustproof net roll (33) is fixed on the upper inner surface of the frame body (31), an even number of auxiliary net rails (34) are connected below the dustproof net roll (33), a guide roll (35) is provided at the end of the auxiliary net rails (34), a cleaning component (36) is provided behind the guide roll (35), and a through groove (37) is provided between the guide roll (35) and the cleaning component (36). The valve inner guide block (15) is provided with a grooved guide block body (151), and the end of the valve inner guide block (15) is connected to an arc-shaped guide rail (152). One of the arc-shaped guide rails (152) is equipped with a connecting top rod (153), and a slide (154) is fixed on the top of the arc-shaped guide rail (152). Both ends of the slide (154) are provided with side slide rails (155). The valve body (17) is provided with a drive shaft (171), an even number of valve discs (172) are installed on the drive shaft (171), a number of embedded spring cylinders (173) are installed on the valve discs (172), a lower top sealing plate (174) is nested inside the valve discs (172), and an upper adapter plate (1721) is installed on one surface of the valve discs (172).

2. The dustproof valve for a ventilation duct according to claim 1, characterized in that: The dustproof net roll (33) has a built-in dustproof net, and both ends of the dustproof net are hollow. The dustproof net inside the dustproof net roll (33) passes through the auxiliary net rail (34) and the guide roll (35) in sequence and is then fixed on the slide (154). The slide (154) is driven to move by the connecting top rod (153), which is driven by the valve body (17). Both ends of the slide (154) are slidably engaged with the side slide rail (155). The arc-shaped guide rail (152) is used for limiting and sliding engagement of the arc-shaped guide rail (152). The cleaning component (36) is engaged with the dustproof net on the dustproof net roll (33).

3. The dustproof valve for a ventilation duct according to claim 1, characterized in that: The upper fitting plate (1721) is adapted to the valve body sealing side block (18), the lower top sealing plate (174) is fixed by the embedded spring sleeve (173), the protrusion of the lower top sealing plate (174) is fixed to the connecting top rod (153), the drive shaft (171) cooperates with the drive device (14), and the lower top sealing plate (174) is abutted on the grooved guide block (151) and the arc-shaped guide rail (152).

4. A dustproof valve for a ventilation duct according to claim 2, characterized in that: The cleaning component (36) is provided with an inclined guide block (361), and an even number of fixing frames (362) are fixed on the surface of the inclined guide block (361). A connecting rod rotating frame (365) is installed on the inner wall of the fixing frame (362). An even number of nested rods (363) are connected to the connecting rod rotating frame (365). An elastic tension rod (364) is installed between each of the even number of nested rods (363). A groove slide rail (371) is opened in the through groove (37).

5. A dustproof valve for a ventilation duct according to claim 4, characterized in that: The inclined guide block (361) is used to guide the dust of the dustproof net on the dustproof net roll (33). The nested rod (363) can be used to install cleaning brush and cleaning brush respectively. The bottom of the nested rod (363) is directly opposite the through groove (37), and the bottom of the through groove (37) is directly opposite the through groove (37). The through groove (37) is engaged with the frame (31).

6. A dustproof valve for a ventilation duct according to claim 1, characterized in that: Top frames (12) are installed on both sides of the outer wall of the valve housing (11). A connecting rod cylinder (16) is fixed on the outer wall of the top frame (12). A tension rod (13) is connected to both the connecting rod cylinder (16) and the upper surface of the valve housing (11). The driving device (14) is located inside the top frame (12).

7. A dustproof valve for a ventilation duct according to claim 6, characterized in that: The drive device (14) is provided with a drive wheel (141), and a driven wheel (143) is provided below the drive wheel (141). A transmission belt (142) is connected between the driven wheel (143) and the drive wheel (141).

8. A dustproof valve for a ventilation duct according to claim 7, characterized in that: The driven wheel (143) is connected to the valve body (17), the drive device (14) consists of a motor and a controller, and the connecting rod cylinder (16) and the valve shell (11) are both hoisted by the tension rod (13).

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