Ventilation duct adjustable valve device

Abstract

This invention discloses an adjustable valve device for ventilation ducts. The adjustable valve device includes a ventilation valve, a valve fixing frame inside the ventilation valve, a valve cylinder fixed on the valve fixing frame, a valve disc installed in the valve cylinder, a drive motor fixed to the outside of the valve cylinder, an even number of hinge ears installed on the valve fixing frame, and a swing cover connected between the hinge ears. A rear air guide tube is connected above the valve cylinder. Several fixed rods are fixed to the inner surface of the valve disc, and rod-mounted paddles are fixed to the ends of the fixed rods. A first cylinder is disposed inside the rear air guide tube, and a second cylinder is connected above the first cylinder. This invention, through the linkage design of the rod-mounted paddles at the top of the fixed rods when the valve disc swings, pushes the connecting plate to synchronously deform the air guide tube. This internal linkage structure of the valve achieves directional guidance and efficient extraction of oil fumes in the ventilation duct, significantly improving the exhaust efficiency of the valve in controlling airflow within the duct.

Description

Technical Field

[0001] This invention relates to the field of ventilation valve technology, specifically an adjustable valve device for ventilation ducts. Background Technology

[0002] In food processing workshops, areas such as steaming pots, frying lines, and washing rooms generate a large amount of heat, steam, or irritating odors. These areas require local exhaust through ventilation duct systems to remove unpleasant gases and residual heat, ensuring the lifespan of equipment and the safety of operators. Electric air valves, as key tubular control accessories in ventilation duct systems, have the core function of directly determining the efficiency and stability of the exhaust system by adjusting the airflow state within the duct in a timed and quantitative manner.

[0003] However, the existing technology has the following shortcomings: Although the current valve can achieve basic opening and closing, the installation distance from the pollution source is far, causing the oil fumes to fully diffuse in the pipeline before contacting the valve. The diffused oil fumes will cause airflow turbulence in the pipeline, and the exhaust path of the valve cannot accurately cover the pollution area, resulting in insufficient local exhaust volume and difficulty in timely discharge of high concentrations of harmful gases. This not only aggravates the risk of environmental pollution in the workshop, but also increases the subsequent cleaning and maintenance costs. Therefore, there is an urgent need for an adjustable valve device that can be adapted to the ventilation ducts of food workshops and solve the problem of "valve performance failure caused by the long distance of the pollution source". 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 an adjustable valve device for ventilation ducts. When the valve disc swings, the top plate of the fixed rod pushes the connecting plate to cause the suction guide tube to deform synchronously, thereby realizing the directional guidance and efficient extraction of oil fumes in the ventilation duct and improving the exhaust efficiency of airflow control in the valve tube.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an adjustable valve device for ventilation ducts, comprising a ventilation valve, a valve fixing frame inside the ventilation valve, a valve cylinder fixed on the valve fixing frame, a valve disc installed in the valve cylinder, a drive motor fixed on the outside of the valve cylinder, an even number of hinge ears installed on the valve fixing frame, a flip cover connected between the hinge ears, and a valve rear air guide cylinder connected above the valve cylinder; a plurality of valve upper fixing rods fixed on the inner surface of the valve disc, and rod upper paddles fixed at the ends of the plurality of valve upper fixing rods; a first cylinder body is provided inside the valve rear air guide cylinder, a second cylinder body is connected above the first cylinder body, an even number of cylinder side fixing covers are installed on the side wall of the first cylinder body, an air guide assembly is installed in the second cylinder body, and an air intake guide cylinder is provided below the air guide assembly.

[0007] In a further improvement to the present invention, an even number of auxiliary swing devices are installed on the inner wall of the first cylinder. Each auxiliary swing device is provided with a limiting clamp below it. A transmission component is provided below one of the limiting clamps. A spring seat is provided inside the auxiliary swing device. Double-folding swing rods are connected to both sides of the spring seat. An even number of spring-loaded clamping blocks are provided between the double-folding swing rods. A rod-mounted pin is connected between the double-folding swing rods. An arc-shaped fixing seat is provided inside the limiting clamp. An even number of bidirectional spring cylinders are fixed on the arc-shaped fixing seat. Each of the even number of bidirectional spring cylinders is equipped with a counter-pulling clamp.

[0008] In a further improvement to the present invention, the transmission component is provided with an elastic nested rod, and an even number of connecting swing driving plates are installed at the top of the elastic nested rod. Each of the even number of connecting swing driving plates is fixed with a sleeve rod, and nested inner rods are connected between the sleeve rods. A rod slide is opened on the upper surface of each sleeve rod, and an inner slider is installed at the top of each sleeve rod. A locking cap is installed on the nested inner rod.

[0009] In a further improvement to the present invention, the locking cap is used to limit the sliding of the nested inner rod in the slide rail on the rod, the inner slider is disposed in the suction guide cylinder for sliding cooperation, the connecting swing drive plate cooperates with the lever on the rod, and the auxiliary swing device is installed between the inner wall of the first cylinder and the outer wall of the suction guide cylinder.

[0010] In a further improvement to the present invention, the pin shaft on the rod is nested with the spring clip rod, the inner wall of the spring clip rod is fixed to the outer wall of the air intake guide tube, the spring seat is fixed in the tube side fixing cover, the limiting clamp is used for limiting the air intake guide tube, the arc-shaped fixing seat is fixed to the inner wall of the first tube, and the pull clamp cooperates with the air intake guide tube.

[0011] In a further improvement to the present invention, a wind duct is provided inside the air intake guide tube, an internal welding frame is fixed in the wind duct, an air intake fan is installed on the internal welding frame, and an annular retaining rail is provided in one end of the wind duct.

[0012] In a further improvement to the present invention, the annular rail is provided for the sliding engagement of the slider inside the rail, the lower part of the suction fan is directly opposite the valve disc, the two sides of the air duct are fixed by the sleeve spring clamping rod, and the other end of the air duct is connected to the air guide assembly.

[0013] In a further improvement to the present invention, the wind guide assembly is provided with an even number of crossbeams, each of which has a sliding groove on its upper surface. A folding bellows tube is provided below the crossbeams, and an anti-detachment locking bolt is fixed on the upper surface of the folding bellows tube.

[0014] In a further improvement to the present invention, the anti-loosening bolt passes through the upper groove of the beam and is fixed to the surface of the folding bellows tube, the end of the folding bellows tube is fixed to the upper surface of the air duct, and both ends of the upper groove of the beam are fixed to the inner wall of the second cylinder.

[0015] In a further improvement to the present invention, the valve disc is used to synchronously swing the intake guide tube via a lever on the rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects;

[0017] 1. This invention utilizes the linkage design of the paddle on the top of the fixed rod when the valve disc swings, which drives the connecting plate to synchronously deform the suction guide tube. This linkage structure inside the valve enables directional guidance and efficient extraction of oil fumes in the ventilation duct, significantly improving the exhaust efficiency of the valve in controlling airflow within the duct.

[0018] 2. In this invention, the crossbeam is placed between the second cylinders and the folding bellows cylinder is fixed by the anti-detachment locking bolts on the sliding groove of the beam. When the suction guide cylinder deforms due to the movement of the valve disc, the folding bellows cylinder uses its own tensile properties to extend and retract in linkage, which not only compensates for the displacement of the guide cylinder and maintains the overall airtightness of the valve, but also avoids the decrease in pumping stability caused by structural loosening. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an adjustable valve device for ventilation ducts according to the present invention;

[0020] Figure 2 This is a side view of an adjustable valve device for ventilation ducts according to the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the air guide tube after the valve in an adjustable valve device for ventilation ducts according to the present invention.

[0022] Figure 4 This is a top view of the air guide component in an adjustable valve device for ventilation ducts according to the present invention.

[0023] Figure 5 This is a top view of the intake guide tube in an adjustable valve device for ventilation ducts according to the present invention.

[0024] Figure 6 This is a side sectional view of the first cylinder in an adjustable valve device for ventilation ducts according to the present invention.

[0025] Figure 7 This is a top view of the transmission component in an adjustable valve device for ventilation ducts according to the present invention.

[0026] Figure 8 This is a partial cross-sectional view of the first cylinder in an adjustable valve device for ventilation ducts according to the present invention.

[0027] Figure 9 This is a schematic diagram of the internal cross-sectional structure of an adjustable valve device for ventilation ducts according to the present invention.

[0028] In the diagram: Ventilation valve-1, Valve fixing frame-11, Valve cylinder-12, Valve disc-13, Drive motor-14, Flip cover-15, Hinge lug-16, Rear air guide tube-17, Disc fixing rod-131, Rod paddle-132, First cylinder-171, Second cylinder-172, Cylinder side fixing cover-173, Air guide assembly-174, Suction guide tube-175, Auxiliary swing device-1711, Limiting clamp-1712, Transmission component-1713, Crossbeam-1741, Slide groove on beam-1742, Anti-detachment locking bolt-1743, Folding bellows tube-1744 1751, 1752, 1753, 17111, 17112, 17113, 17121, 17122, 17123, 17124, 17135, 17136, 17137, 17511, 17138, 17139, 17130, 17131, 17132, 17133, 17134, 17135, 17136, 17137, 17511, 171121, 171121. 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:

[0034] Example 1: As shown in the attached document Figure 1 To be continued Figure 5 As shown:

[0035] This embodiment provides an adjustable valve device for ventilation ducts, including a ventilation valve 1, a valve fixing frame 11 inside the ventilation valve 1, a valve cylinder 12 fixed on the valve fixing frame 11, a valve disc 13 installed in the valve cylinder 12, a drive motor 14 fixed on the outside of the valve cylinder 12, an even number of hinge ears 16 installed on the valve fixing frame 11, a swing cover 15 connected between the hinge ears 16, and a valve rear air guide cylinder 17 connected above the valve cylinder 12.

[0036] Furthermore, the swing cover 15 is mainly installed on the valve fixing frame 11 to fit it and complete the closure. The valve fixing frame 11 allows the ventilation duct to extend out from the swing cover 15 to cover the area below the ceiling panel. The hinge ears 16 connected on both sides allow the swing cover 15 to swing on the valve fixing frame 11. Without opening the ceiling panel, the drive motor 14 can be directly opened for maintenance and repair.

[0037] The valve-following air duct 17 contains a first cylinder 171, and a second cylinder 172 is connected above the first cylinder 171. An even number of cylinder side fixing covers 173 are installed on the side wall of the first cylinder 171. An air guide assembly 174 is installed in the second cylinder 172. An air intake guide cylinder 175 is installed below the air guide assembly 174. An even number of auxiliary swing devices 1711 are installed on the inner wall of the first cylinder 171. Each auxiliary swing device 1711 is provided with a limit clamp 1712 below it. A transmission component 1713 is provided below one of the limit clamps 1712.

[0038] Furthermore, the transmission component 1713 is mainly used to cooperate with the lever 132 mounted on the valve disc 13 for transmission, so that the transmission component 1713 triggers the intake guide cylinder 175 to form a displacement.

[0039] Furthermore, the auxiliary swing device 1711 is mainly used for the connection between the air intake guide tube 175 and the first cylinder 171. As the air intake guide tube 175 moves, the auxiliary swing device 1711 deforms, thus completing the synchronous adjustment of the angle of the air intake guide tube 175.

[0040] The wind guide assembly 174 is provided with an even number of crossbeams 1741, each of which has a sliding groove 1742. A folding bellows tube 1744 is provided below the crossbeams 1741, and an anti-detachment locking bolt 1743 is fixed on the upper surface of the folding bellows tube 1744.

[0041] Furthermore, the folding accordion tube 1744 is mainly installed below the crossbeam 1741 and fixed by the anti-detachment bolt 1743, while the other end of the folding accordion tube 1744 is fixed to the top surface of the air intake guide tube 175, forming a linkage tension.

[0042] The air intake guide tube 175 is equipped with an air duct 1751, and an internal welding frame 1752 is fixed in the air duct 1751. An air intake fan 1753 is installed on the internal welding frame 1752.

[0043] Furthermore, the suction fan 1753 is mainly fixed by the built-in welding frame 1752, and the built-in welding frame 1752 indirectly adjusts the suction angle of the suction fan 1753 in conjunction with the change of the angle of the air duct 1751.

[0044] The specific working principle is as follows:

[0045] In this invention, the ventilation valve 1 is installed between ventilation ducts. The valve fixing frame 11 can pass through the ceiling panel covering the ventilation ducts. The swing cover 15 on the valve fixing frame 11 is hinged to the hinge lug 16, allowing direct maintenance of the drive motor 14 from below the ceiling panel. During use, the valve disc 13 inside the valve cylinder 12 is driven to open and close by the drive motor 14. The rear air guide tube 17 is fixed behind the valve cylinder 12 for connecting to another section of the ventilation duct. The first cylinder 171 and the second cylinder 172 are threaded together. The cylinder side fixing cover 173 is installed in conjunction with the auxiliary swing device 1711. The air guide assembly 174 and the suction guide tube 175 are placed inside the first cylinder 171 and the second cylinder 172. During operation, the drive motor 14... The drive valve 13 swings, and the lever on the fixed rod on the valve 13 pushes the connecting plate, causing the suction guide tube 175 to deform synchronously, which enhances the directional guidance of oil fumes in the pipeline. At the same time, the built-in welding frame 1752 in the suction guide tube 175 drives the suction fan 1753 to achieve efficient extraction. The airflow in the pipeline flows through the folded bellows tube 1744 on the top surface of the air duct 1751. The other end of the folded bellows tube 1744 is fixed by the anti-loosening bolt 1743 on the crossbeam 1741 through the slide groove 1742 on the beam. When the guide tube deforms, the folded bellows tube 1744 expands and contracts to compensate for the displacement, which not only maintains the structural airtightness of the air duct 1751 and the folded bellows tube 1744, but also enhances the operational stability of the extraction system.

[0046] Example 2: As shown in the attached document Figure 2 To be continued Figure 9 As shown:

[0047] The valve fixing frame 11 is fixed with a valve cylinder 12, a valve disc 13 is installed in the valve cylinder 12, a drive motor 14 is fixed on the outside of the valve cylinder 12, an even number of hinge ears 16 are installed on the valve fixing frame 11, a swing cover 15 is connected between the hinge ears 16, and a valve rear air guide cylinder 17 is connected above the valve cylinder 12; several valve upper fixing rods 131 are fixed on the inner surface of the valve disc 13, and rod upper paddles 132 are fixed at the ends of the several valve upper fixing rods 131.

[0048] Furthermore, the valve disc 13 is mainly driven by the drive motor 14, which causes it to swing and form a ventilation operation for the ventilation duct. The valve disc fixing rod 131 is fixed to the inner surface of the valve disc 13, and at least three rods are arranged in a triangular pattern. The ends of the rods are used for the fixed connection of the lever 132.

[0049] The valve-following air duct 17 contains a first cylinder 171, a second cylinder 172 is connected above the first cylinder 171, an even number of cylinder side fixing covers 173 are installed on the side wall of the first cylinder 171, an air guide assembly 174 is installed in the second cylinder 172, and an air intake guide 175 is provided below the air guide assembly 174.

[0050] Furthermore, the diameter of the first cylinder 171 is smaller than that of the second cylinder 172, because the second cylinder 172 needs to provide space for the air intake guide cylinder 175 and the air guide assembly 174 to better complete the efficient extraction work.

[0051] The inner wall of the first cylinder 171 is equipped with an even number of auxiliary swing devices 1711. Each auxiliary swing device 1711 is provided with a limit clamp 1712 below it, and a transmission component 1713 is provided below one of the limit clamps 1712. The auxiliary swing device 1711 is provided with a spring seat 17111. Both sides of the spring seat 17111 are connected to double-folding swing rods 17112. An even number of spring clamping blocks 17113 are provided between the double-folding swing rods 17112. The double-folding swing rods 17112 are connected by rod-mounted pin shafts 171121.

[0052] Furthermore, the spring seat 17111 is mainly used for the installation of the spring clamping block rod 17113. Through the built-in top spring of the spring seat 17111, the spring clamping block rod 17113 is lifted, so that the spring clamping block rod 17113 and the air intake guide cylinder 175 undergo angular deformation.

[0053] Furthermore, the pin shaft 171121 on the rod is mainly connected between the double-folding swing rods 17112 and passes through the clamping block inside the spring clamping block rod 17113, so that the double-folding swing rods 17112 can form length compensation when the air intake guide tube 175 changes angle.

[0054] The wind guide assembly 174 has an even number of crossbeams 1741, each of which has a sliding groove 1742. A folding bellows tube 1744 is located below the crossbeams 1741, and an anti-detachment locking bolt 1743 is fixed on the upper surface of the folding bellows tube 1744. The air intake guide tube 175 has an air duct 1751, and an internal welding frame 1752 is fixed in the air duct 1751. An air intake fan 1753 is installed on the internal welding frame 1752. A ring rail 17511 is located at one end of the air duct 1751.

[0055] Furthermore, at least two crossbeams 1741 are provided, each with a sliding groove 1742 in the middle section. The folding accordion tube 1744 is fixed by passing through the sliding groove 1742 with an anti-loosening bolt 1743.

[0056] Furthermore, the folding bellows tube 1744 mainly uses its own stretchability to work with the air intake tube 175 to complete the angle change synchronously when the angle changes, so that the air drawn out by the air intake tube 175 is input into the folding bellows tube 1744 and finally connected to the rear ventilation duct to complete the stable output of air volume.

[0057] Furthermore, an annular guide rail 17511 is provided at one end of the ventilation duct 1751, mainly for the sliding block 17135 inside the guide rail to slide.

[0058] The limiting clamp 1712 is provided with an arc-shaped fixing seat 17121, and an even number of bidirectional spring sleeves 17122 are fixed on the arc-shaped fixing seat 17121. Each of the even number of bidirectional spring sleeves 17122 is equipped with a pull clamp 17123.

[0059] Furthermore, the bidirectional spring sleeve 17122 has a built-in tension spring, and the two ends of the tension spring are fixed to the pull clamp 17123 respectively, so that the pull clamp 17123 completes the limiting engagement of the end of the air duct 1751 to prevent the air duct 1751 from exceeding the displacement range.

[0060] The transmission component 1713 is equipped with a spring-loaded nested rod 17131. An even number of connecting swing plates 17132 are installed at the top of the spring-loaded nested rod 17131. Each of the even number of connecting swing plates 17132 is fixed with a sleeve rod 17133. The sleeve rods 17133 are connected to each other with a nested inner rod 17136. Each of the sleeve rods 17133 has a rod slide rail 17134 on its upper surface. Each of the sleeve rods 17133 has an inner slide rail 17135 installed at the top of its top. A locking cap 17137 is installed on the nested inner rod 17136.

[0061] Furthermore, the elastic nesting rod 17131 is mainly used to support the connecting swing drive plate 17132, which is fixed by the sleeve rod 17133 and moves in conjunction with the end rail slider 17135 on the annular retaining rail 17511.

[0062] Furthermore, the sleeve rods 17133 are connected by nested inner rods 17136, and the surface of the nested inner rods 17136 is fixed with locking caps 17137, so that the locking caps 17137 slide and limit in the slide rails 17134 on the rod, which is suitable for the extension and retraction of the sleeve rods 17133 and the nested inner rods 17136.

[0063] Furthermore, the swing-driven plate 17132, through the lever 132, is pushed by the valve disc 13, causing the lever 132 to compress the elastic nested rod 17131. This causes the elastic nested rod 17131 to contract and, in conjunction with the air duct 1751, to change its angle. Simultaneously, it forms a parallel relationship with the valve disc 13 below, enhancing the extraction efficiency of the ventilation duct.

[0064] The specific working principle is as follows:

[0065] This invention utilizes the valve disc 13 within the valve cylinder 12 inside the valve fixing frame 11, driven by a drive motor 14, to create a swinging motion. During this swinging process, the end lever 132 of the valve disc 13's fixed rod 131 actuates the connecting swing driving plate 17132, causing the connecting swing driving plate 17132 to compress the elastic nested rod 17131. The nested inner rod 17136 connecting the sleeve rods 17133 adjusts its length through the cooperation of the rod slide 17134 and the locking cap 17137. The inner slider 17135 installed at the end of the sleeve rod 17133 assists in movement within the annular rail 17511. As the air duct 1751 tilts under force, the auxiliary swing device 1711 on one side engages with the spring clamping block rod 171. With the cooperation of valve 13 and spring seat 17111, the valve 1751 is forced to retract inward, while the auxiliary swing device 1711 on the other side extends in the opposite direction. The double-fold connecting swing rod 17112 extends and retracts simultaneously to complete the reinforcement of the air duct 1751. The air duct 1751 is inclined and parallel to the valve disc 13. The top of the air duct 1751 is limited between the double-acting spring sleeve 17122 and the pull clamp 17123 on the arc-shaped fixed seat 17121. After the suction fan 1753 on the built-in welding frame 1752 in the air duct 1751 is turned on, it forms the air movement. With the cooperation of the parallel valve disc 13, it completes the extraction of oil fumes in the ventilation duct. Finally, through this linkage process, the directional guidance and efficient extraction of oil fumes in the ventilation duct are achieved, which significantly improves the exhaust efficiency of the valve in the airflow control in the pipe.

[0066] 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.

[0067] 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.

[0068] 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. An adjustable valve device for ventilation ducts, characterized in that, The system includes a ventilation valve (1), a valve fixing frame (11) is provided inside the ventilation valve (1), a valve cylinder (12) is fixed on the valve fixing frame (11), a valve disc (13) is installed in the valve cylinder (12), a drive motor (14) is fixed on the outside of the valve cylinder (12), an even number of hinge ears (16) are installed on the valve fixing frame (11), a swing cover (15) is connected between the hinge ears (16), and a valve rear air guide cylinder (17) is connected above the valve cylinder (12). The valve disc (13) has several valve fixing rods (131) fixed on its inner surface, and the valve fixing rods (131) have rod paddles (132) fixed at their ends. The valve-following air guide tube (17) is provided with a first cylinder (171), and a second cylinder (172) is connected above the first cylinder (171). An even number of cylinder side fixing covers (173) are installed on the side wall of the first cylinder (171). An air guide assembly (174) is installed in the second cylinder (172), and an air intake guide tube (175) is provided below the air guide assembly (174). An even number of auxiliary swing devices (1711) are installed on the inner wall of the first cylinder (171). Each of the auxiliary swing devices (1711) is provided with a limit clamp (1712) below it. A transmission component (1713) is provided below one of the limit clamps (1712). The transmission component (1713) is provided with a spring-loaded nested rod (17131). An even number of connecting swing drive plates (17132) are installed at the top of the spring-loaded nested rod (17131). Each of the even number of connecting swing drive plates (17132) is fixed with a sleeve rod (17133). The sleeve rods (17133) are connected to each other with a nested inner rod (17136). Each sleeve rod (17133) has a rod slide rail (17134) on its upper surface. Each sleeve rod (17133) has an inner slide block (17135) installed at the top of its top. A locking cap (17137) is installed on the nested inner rod (17136). The valve disc (13) swings synchronously with the intake guide tube (175) via the lever (132) on the rod.

2. The adjustable valve device for ventilation ducts according to claim 1, characterized in that: The auxiliary pendulum device (1711) is provided with a spring seat (17111), and double-fold pendulum rods (17112) are connected to both sides of the spring seat (17111). An even number of spring clamping blocks (17113) are provided between the double-fold pendulum rods (17112). A rod-mounted pin shaft (171121) is connected between the double-fold pendulum rods (17112). An arc-shaped fixing seat (17121) is provided inside the limiting clamp (17122). An even number of bidirectional spring cylinders (17122) are fixed on the arc-shaped fixing seat (17121). Each of the even number of bidirectional spring cylinders (17122) is equipped with a pull clamp (17123).

3. The adjustable valve device for ventilation ducts according to claim 1, characterized in that: The locking cap (17137) is used to limit the sliding of the nested inner rod (17136) in the upper slide rail (17134) of the rod. The inner slide block (17135) is disposed in the air intake guide tube (175) for sliding cooperation. The connecting swing drive plate (17132) cooperates with the upper lever (132) of the rod. The auxiliary swing device (1711) is installed between the inner wall of the first cylinder (171) and the outer wall of the air intake guide tube (175).

4. The adjustable valve device for ventilation ducts according to claim 2, characterized in that: The pin shaft (171121) on the rod is nested with the spring clip rod (17113). The inner wall of the spring clip rod (17113) is fixed to the outer wall of the air intake guide tube (175). The spring seat (17111) is fixed in the tube side fixing cover (173). The limiting clamp (1712) is used for limiting the air intake guide tube (175). The arc-shaped fixing seat (17121) is fixed to the inner wall of the first cylinder (171). The pull clamp (17123) cooperates with the air intake guide tube (175).

5. The adjustable valve device for a ventilation duct according to claim 4, characterized in that: The air intake guide tube (175) is provided with an air duct (1751), and an internal welding frame (1752) is fixed in the air duct (1751). An air intake fan (1753) is installed on the internal welding frame (1752). An annular retaining rail (17511) is opened in one end of the air duct (1751).

6. The adjustable valve device for a ventilation duct according to claim 5, characterized in that: The annular rail (17511) is slidably engaged with the inner slider (17135). The suction fan (1753) is directly below the valve disc (13). The two sides of the air duct (1751) are fixed by the spring clamping rod (17113). The other end of the air duct (1751) is connected to the air guide assembly (174).

7. The adjustable valve device for a ventilation duct according to claim 6, characterized in that: The wind guide assembly (174) is provided with an even number of crossbeams (1741), and each of the even number of crossbeams (1741) is provided with a beam sliding groove (1742). A folding bellows tube (1744) is provided below the crossbeams (1741), and an anti-detachment locking bolt (1743) is fixed on the upper surface of the folding bellows tube (1744).

8. The adjustable valve device for a ventilation duct according to claim 7, characterized in that: The anti-detachment bolt (1743) passes through the upper slide groove (1742) of the beam and is fixed to the surface of the folding accordion tube (1744). The end of the folding accordion tube (1744) is fixed to the upper surface of the air duct (1751). The two ends of the upper slide groove (1742) of the beam are fixed to the inner wall of the second cylinder (172).

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