Adjusting structure for smoke exhaust air pipe and smoke exhaust system

Abstract

The utility model provides an adjusting structure for a smoke exhaust air pipe and a smoke exhaust system. The adjusting structure comprises a mounting base, a blade set, a sliding part and a self-locking mechanism. The mounting base is used for being fixed to an outlet of a smoke exhaust air pipe and is provided with an inner cavity penetrating in the airflow flowing direction. The blade group is arranged in the inner cavity and comprises a plurality of blades which are distributed in parallel at intervals; the two ends of each blade are rotationally connected with the mounting base so that the blade can swing till the surface of the blade is perpendicular to or parallel to the axial direction of the inner cavity. The sliding pieces are arranged in the inner cavity and arranged on the outer side of the blade set in parallel in the arrangement direction of the blades. The sliding piece is in sliding connection with the mounting base, and a transmission structure is arranged between the sliding piece and each blade; the self-locking mechanism is arranged in the inner cavity and used for being connected with the sliding piece so as to limit movement of the sliding piece. According to the adjusting structure for the smoke exhaust duct, the self-locking mechanism can ensure that the blade group is not interfered by unexpected conditions and is closed during smoke exhaust, smoke can be timely exhausted, and the safety risk is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of fire-fighting smoke exhaust equipment, and more specifically, it relates to an adjustable structure for smoke exhaust ducts and a smoke exhaust system. Background Technology

[0002] Electronic cleanrooms are typically enclosed environments, making it difficult to utilize natural smoke extraction methods such as windows or skylights in the event of a fire. Due to the airtight nature of cleanrooms, smoke extraction systems are essential to ensure the rapid removal of smoke and the safety of personnel in the event of a fire.

[0003] Currently, smoke extraction systems in electronic cleanrooms typically include multiple smoke extraction vents. In the event of a fire requiring smoke extraction, these vents are remotely controlled to open, allowing smoke to pass through the exhaust ducts and be discharged through the vents. After the fire is extinguished, the smoke extraction vents are remotely controlled to reset.

[0004] The inventors discovered that during a fire, smoke exhaust vents are easily affected by vibration or blowing, which can cause the smoke exhaust vents to close unexpectedly, preventing the smoke from being discharged in time and creating a safety hazard. Utility Model Content

[0005] The purpose of this application is to provide an adjustment structure for smoke exhaust ducts to solve the technical problem that existing smoke exhaust duct adjustment structures are prone to poor smoke exhaust or closure during the smoke exhaust process.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide an adjustment structure for a smoke exhaust duct, comprising:

[0007] Mounting base for fixing at the outlet of the exhaust duct, and having an inner cavity that runs through the airflow direction;

[0008] A blade assembly, disposed within the inner cavity, comprises multiple blades arranged in parallel and spaced apart; each blade is rotatably connected at both ends to the mounting base to be adapted to swing so that its surface is perpendicular or parallel to the axial direction of the inner cavity; when each blade swings so that its surface is perpendicular to the axial direction of the inner cavity, two adjacent blades overlap to close the inner cavity.

[0009] A sliding member is disposed within the inner cavity and arranged side-by-side on the outer side of the blade group along the arrangement direction of the blades; the sliding member is slidably connected to the mounting base, and a transmission structure is provided between the sliding member and each blade, so that when the sliding member moves, the transmission structure drives the blade to rotate; and

[0010] A self-locking mechanism is disposed in the inner cavity and is used to connect with the sliding member to restrict the movement of the sliding member and to ensure that each blade is in a position where its surface is parallel to the axial direction of the inner cavity.

[0011] Preferably, the self-locking mechanism includes:

[0012] A swing plate, disposed within the inner cavity and hinged to the mounting base; and

[0013] A first elastic element is disposed in the inner cavity, between the swing plate and the inner wall of the mounting base, so as to drive the swing plate to swing along a preset trajectory.

[0014] The side of the swing plate facing the slider is an inclined surface; during the process of the blade rotating from its surface perpendicular to the inner cavity axis to parallel to the inner cavity axis, the slider abuts against the inclined surface, so that the swing plate swings in the opposite direction along the preset trajectory and the first elastic member undergoes elastic deformation.

[0015] Furthermore, a groove is provided on the swing end face of the swing plate; when the blade rotates to a position where its surface is parallel to the axial direction of the inner cavity, the first elastic member can drive the swing plate to swing along the preset trajectory so that the sliding member is embedded in the groove.

[0016] Preferably, the swing plate has a pull rod extending toward the first elastic member, and the extended end of the pull rod passes through the mounting base and extends outward.

[0017] Preferably, at least one transmission plate is fixedly connected to the sliding member, the transmission plate extends along the arrangement direction of the blades, and is slidably connected to the mounting base along the arrangement direction of the blades.

[0018] Preferably, the transmission structure includes:

[0019] A guide groove is formed on the transmission plate, and its opening direction is perpendicular to the axial direction of the inner cavity and also perpendicular to the arrangement direction of the blades; and

[0020] A transmission rod is fixedly connected to the blade, and the extended end of the transmission rod has a bent portion that is fitted into the guide groove;

[0021] When the transmission plate moves with the sliding member, the bent portion slides in the guide groove to make the blade swing.

[0022] Preferably, a second elastic element is provided between the transmission plate and the mounting base;

[0023] When the blade swings from a state where its surface is perpendicular to the axial direction of the inner cavity, the second elastic element undergoes elastic deformation to adapt to driving the blade to swing to a state where its surface is perpendicular to the axial direction of the inner cavity.

[0024] Preferably, a pull rope is connected to the side of the slider facing away from the blade group. The pull rope passes through the mounting base on the side of the slider facing away from the blade group and extends out to be pulled manually, so that the slider moves away from the blade group until each blade is in a state where its surface is parallel to the axial direction of the inner cavity.

[0025] Preferably, the mounting base further includes:

[0026] A baffle is fixedly disposed in the inner cavity and positioned between the blade assembly and the sliding member to restrict the passage of flue gas.

[0027] In this embodiment, the mounting base is fixedly installed at the outlet of the smoke exhaust duct. When no fire occurs, multiple blades in the blade assembly are overlapped, sealing the inner cavity. In the event of a fire, by controlling the movement of the sliding member, the sliding member can simultaneously drive multiple blades to rotate via multiple transmission structures, allowing each blade to switch from a state perpendicular to the inner cavity axis to a state parallel to the inner cavity axis, thus opening the inner cavity and achieving smoke exhaust. When each blade is parallel to the inner cavity axis on its surface, the self-locking mechanism within the mounting base can fix the position of the sliding member, thereby ensuring that the inner cavity remains open and preventing the blade assembly from being closed due to unforeseen circumstances.

[0028] Compared with the prior art, the adjustment structure for the exhaust duct provided in this application embodiment has a self-locking mechanism that ensures that the blade assembly will not be disturbed by unexpected situations and thus close during the exhaust process, ensuring that the flue gas can be discharged in a timely manner and reducing safety risks.

[0029] The technical solution adopted in this application also provides a smoke exhaust system, including a smoke exhaust duct and a plurality of the aforementioned adjustment structures installed on the smoke exhaust duct.

[0030] Preferably, the smoke exhaust system also includes:

[0031] A control element, connected to each of the sliding elements, is used to move the sliding element to a position where each of the corresponding blades is parallel to the axial direction of the inner cavity on its surface.

[0032] The beneficial effects of the smoke exhaust system provided in this embodiment are the same as those of the aforementioned smoke exhaust duct adjustment structure and smoke exhaust system, and will not be repeated here. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A three-dimensional structural diagram of the adjustable structure for smoke exhaust ducts provided in the embodiments of this application. Figure 1 ;

[0035] Figure 2 A top view of the adjustable structure for the smoke exhaust duct provided in the embodiments of this application. Figure 1 ;

[0036] Figure 3 For along Figure 2 Schematic diagram of the cross-sectional structure of line AA in the middle;

[0037] Figure 4 for Figure 3 A magnified structural diagram of region I in the middle;

[0038] Figure 5 A three-dimensional structural diagram of the adjustable structure for smoke exhaust ducts provided in the embodiments of this application. Figure 2 ;

[0039] Figure 6 A top view of the adjustable structure for the smoke exhaust duct provided in the embodiments of this application. Figure 2 ;

[0040] Figure 7 For along Figure 6 Schematic diagram of the cross-sectional structure of the middle BB line;

[0041] Figure 8 for Figure 7 Enlarged structural diagram of region II;

[0042] Figure 9 This is a schematic diagram of the structure of the smoke exhaust system provided in the embodiments of this application;

[0043] The following are the labeling elements in the figure:

[0044] 1. Mounting base; 2. Blade; 3. Sliding component; 31. Transmission plate; 311. Second elastic component; 32. Pull rope; 4. Transmission structure; 41. Guide groove; 42. Transmission rod; 5. Self-locking mechanism; 51. Swing plate; 511. Groove; 512. Pull rod; 52. First elastic component; 6. Baffle; 7. Smoke exhaust duct; 8. Control component. Detailed Implementation

[0045] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0046] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0047] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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 application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0049] Please refer to the following: Figures 1 to 9 The adjustment structure for the smoke exhaust duct provided in this application will now be described. The adjustment structure for the smoke exhaust duct includes a mounting base 1, two sets of blades, a sliding member 3, and a self-locking mechanism 5.

[0050] Mounting base 1 is used to fix at the outlet of smoke exhaust duct 7 and has an inner cavity that runs through the airflow direction.

[0051] Two sets of blades are arranged in the inner cavity, including multiple blades 2 that are parallel and spaced apart. The blades 2 are made of metal to prevent them from melting due to the high temperature of a fire. The two ends of each blade 2 are rotatably connected to the mounting base 1 to allow it to swing so that its surface is perpendicular or parallel to the axis of the inner cavity. When each blade 2 swings so that its surface is perpendicular to the axis of the inner cavity, two adjacent blades 2 overlap to close the inner cavity.

[0052] The sliding member 3 is disposed in the inner cavity and is arranged in parallel on the outer side of the blade 2 group along the arrangement direction of the blade 2; the sliding member 3 is slidably connected to the mounting base 1, and there is a transmission structure 4 between the sliding member 3 and each blade 2, so that when the sliding member 3 moves, the transmission structure 4 drives the blade 2 to rotate; wherein the transmission mechanism can limit the reciprocating distance of the sliding member 3, thereby limiting the rotation amplitude of each blade 2, so that its surface can only switch to a parallel state perpendicular to the axis of the inner cavity.

[0053] The self-locking mechanism 5 is disposed in the inner cavity and is used to connect with the sliding member 3 to restrict the movement of the sliding member 3 and to ensure that each blade 2 is in a position where its surface is parallel to the axial direction of the inner cavity.

[0054] In this embodiment, the mounting base 1 is fixedly installed at the outlet of the smoke exhaust duct 7. When no fire occurs, multiple blades 2 in the blade group 2 are in a state of overlapping and closing the inner cavity. When a fire occurs, by controlling the movement of the sliding member 3, the sliding member 3 can drive multiple blades 2 to rotate simultaneously through multiple transmission structures 4, so that each blade 2 can rotate from a state perpendicular to the inner cavity axis to a state parallel to the inner cavity axis, thereby opening the inner cavity and realizing smoke exhaust. When each blade 2 is in a state where its surface is parallel to the inner cavity axis, the self-locking mechanism 5 in the mounting base 1 can fix the position of the sliding member 3, thereby ensuring that the inner cavity is always in an open state and preventing the blade group 2 from being closed due to unexpected situations.

[0055] Compared with the prior art, the adjustment structure for the exhaust duct provided in this application embodiment has a self-locking mechanism 5 that ensures that the blade group 2 will not be disturbed by unexpected situations and thus close during the exhaust process, ensuring that the flue gas can be discharged in a timely manner and reducing safety risks.

[0056] In some embodiments, please refer to the following: Figures 1 to 9 As a specific embodiment of the adjustment structure for smoke exhaust duct provided in this application, the self-locking mechanism 5 includes a swing plate 51 and a first elastic member 52.

[0057] The swing plate 51 is disposed in the inner cavity and hinged to the mounting base 1. The surface of the swing plate 51 and the inner bottom surface of the mounting base 1 always have a certain angle, and the side of the swing plate 51 facing the sliding member 3 is an inclined surface.

[0058] The first elastic element 52 is disposed in the inner cavity, between the swing plate 51 and the inner wall of the mounting base 1, so as to drive the swing plate 51 to swing along a preset trajectory; the first elastic element 52 is a compression spring, and the upper and lower ends of the compression spring are respectively connected to the side of the swing plate 51 facing the ground inside the mounting base 1 and the mounting base 1.

[0059] During the process of the blade 2 rotating from its surface perpendicular to the inner cavity axis to being parallel to the inner cavity axis, the sliding member 3 abuts against the inclined surface, so that the swing plate 51 swings in the opposite direction along the preset trajectory and the first elastic member 52 undergoes elastic deformation; during the process of the blade 2 rotating from its surface parallel to the inner cavity axis to being perpendicular to the inner cavity axis, the first elastic member 52 can drive the swing plate 51 to reset.

[0060] A groove 511 is provided on the swing end face of the swing plate 51. The groove 511 can also be in the form of a step, with the height of the step being lower than the highest point of the inclined surface of the swing plate 51. When the blade 2 rotates to a position where its surface is parallel to the axial direction of the inner cavity, the first elastic member 52 can drive the swing plate 51 to swing along a preset trajectory so that the sliding member 3 is embedded in the groove 511.

[0061] By adopting the above technical solution, the groove 511 on the swing plate 51 can fix the position of the sliding member 3 and achieve self-locking. Furthermore, by adjusting the position of the swing plate 51, the position of the sliding member 3 when it is fixed can be easily adjusted, thereby adjusting the angle between the surface of the blade 2 and the axial direction of the inner cavity when it is fixed.

[0062] In some embodiments, please refer to the following: Figure 3 , Figure 4 , Figure 7 and Figure 8 As a specific embodiment of the adjustment structure for the exhaust duct provided in this application, the swing plate 51 has a pull rod 512 extending toward the first elastic member 52, and the extended end of the pull rod 512 passes through the mounting base 1 and extends out.

[0063] By adopting the above technical solution, when a force is applied to the pull rod 512 along its extension direction, the pull rod 512 can be pulled to move away from the mounting base 1. During this process, the pull rod 512 drives the swing plate 51 to swing towards the first elastic member 52, thereby causing the sliding member 3 to disengage from the groove 511 and restore free movement. The above solution enables personnel to unlock the blade 2 and return it to its original position by manually pulling the pull rod 512 after the smoke exhaust is completed.

[0064] In some embodiments, please refer to the following: Figures 1 to 3 , Figures 5 to 7 As a specific embodiment of the adjustment structure for exhaust duct provided in this application, at least one transmission plate 31 is fixedly connected to the sliding member 3. The transmission plate 31 extends along the arrangement direction of the blades 2 and is slidably connected to the mounting base 1 along the arrangement direction of the blades 2.

[0065] By adopting the above technical solution, the transmission plate 31 can transmit the force applied to the sliding rod to the rotation of each blade 2.

[0066] In some embodiments, please refer to the following: Figures 1 to 3 , Figures 5 to 7 As a specific embodiment of the adjustment structure for smoke exhaust duct provided in this application, the transmission structure 4 includes a guide groove 41 and a transmission rod 42.

[0067] The guide groove 41 is formed on the transmission plate 31, and its opening direction is perpendicular to the axial direction of the inner cavity and also perpendicular to the arrangement direction of the blades 2.

[0068] The transmission rod 42 is fixedly connected to the blade 2, and the extended end of the transmission rod 42 has a bent portion that is fitted into the guide groove 41.

[0069] When the transmission plate 31 moves with the sliding member 3, the bent part slides in the guide groove 41 to make the blade 2 swing.

[0070] By adopting the above technical solution, the blade 2 is oscillating using a slider-groove mechanism, which has the advantages of simple structure, rapid response, and easy maintenance; and the length of the guide groove 41 can limit the range of movement of the bent part within the guide groove 41, thereby limiting the oscillation range of the blade 2.

[0071] In some embodiments, please refer to the following: Figures 1 to 3 As a specific embodiment of the adjustment structure for exhaust duct provided in this application, a second elastic element 311 is provided between the transmission plate 31 and the mounting base 1.

[0072] The second elastic element 311 is a compression spring sleeved on the transmission plate 31, with both ends of the compression spring connected to the transmission plate 31 and the mounting base 1, respectively.

[0073] When the blade 2 swings from a state where its surface is perpendicular to the axial direction of the inner cavity, the second elastic element 311 undergoes elastic deformation to be adapted to drive the blade 2 to swing to a state where its surface is perpendicular to the axial direction of the inner cavity.

[0074] By adopting the above technical solution, when the moving part disengages from the groove 511 on the swing plate 51, the second elastic element 311 can drive the transmission plate 31 to move to the initial position, thereby driving the blade 2 to reset.

[0075] In some embodiments, please refer to the following: Figures 1 to 9 As a specific embodiment of the adjustment structure for the exhaust duct provided in this application, a pull rope 32 is connected to the side of the sliding member 3 facing away from the blade group 2. The pull rope 32 passes through the mounting base 1 on the side of the sliding member 3 facing away from the blade group 2 and extends out, so as to be pulled by hand, so that the sliding member 3 moves away from the blade group 2 until each blade 2 is in a state where its surface is parallel to the axial direction of the inner cavity.

[0076] By adopting the above technical solution, the staff can remotely control the sliding part 3 to move away from the blade 2 group by pulling the rope 32. The rope 32 can also be pulled remotely by the rope winder and other equipment, which improves the ease of operation of the equipment.

[0077] In some embodiments, please refer to the following: Figures 1 to 9 As a specific embodiment of the adjustment structure for the smoke exhaust duct provided in this application, the mounting base 1 also includes a baffle 6.

[0078] The baffle 6 is fixedly installed in the inner cavity and is located between the blade group 2 and the sliding member 3 to restrict the passage of flue gas.

[0079] By adopting the above technical solution, the baffle 6 can restrict the flue gas from being discharged to other areas through the through hole through which the pull rope 32 on one side of the sliding member 3 passes.

[0080] The technical solution adopted in this application also provides a smoke exhaust system, including a smoke exhaust duct 7 and a plurality of adjustment structures of any of the foregoing installed on the smoke exhaust duct 7.

[0081] In some embodiments, please refer to Figure 9 As a specific embodiment of the smoke exhaust system provided in this application, the smoke exhaust system also includes a control component 8.

[0082] The control component 8 is connected to each sliding component 3 and is used to move the sliding component 3 to a state in which each corresponding blade 2 is parallel to the axial direction of its surface and the inner cavity. The control component 8 can be a multi-rope winding machine, which can simultaneously wind up the pull ropes 32 on multiple adjustment structures. A tension spring can be set between each pull rope 32 and the multi-rope winding machine to ensure that the winding groove operation can be performed normally when the lengths of multiple pull ropes 32 are inconsistent.

[0083] The beneficial effects of the smoke exhaust system provided in this embodiment are the same as those of the aforementioned smoke exhaust duct regulating structure, and will not be repeated here.

[0084] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An adjustable structure for smoke exhaust ducts, characterized in that, include: Mounting base (1) is used to fix the exhaust duct (7) at the outlet and has an inner cavity that runs through the airflow direction; A blade assembly is disposed in the inner cavity, comprising a plurality of parallel and spaced blades (2); each blade (2) is rotatably connected at both ends to the mounting base (1) to be adapted to swing so that its surface is perpendicular or parallel to the axial direction of the inner cavity; when each blade (2) swings so that its surface is perpendicular to the axial direction of the inner cavity, two adjacent blades (2) overlap to close the inner cavity. A sliding member (3) is disposed in the inner cavity and arranged in parallel on the outer side of the blade group along the arrangement direction of the blades (2); the sliding member (3) is slidably connected to the mounting base (1), and a transmission structure (4) is provided between the sliding member (3) and each blade (2) so that when the sliding member (3) moves, the transmission structure (4) drives the blade (2) to rotate. as well as A self-locking mechanism (5) is provided in the inner cavity for connecting with the sliding member (3) to restrict the movement of the sliding member (3) and to position each blade (2) with its surface parallel to the axial direction of the inner cavity.

2. The regulating structure for smoke exhaust ducts as described in claim 1, characterized in that, The self-locking mechanism (5) includes: A swing plate (51) is disposed in the inner cavity and hinged to the mounting base (1); and The first elastic element (52) is disposed in the inner cavity, between the swing plate (51) and the inner wall of the mounting base (1), so as to drive the swing plate (51) to swing along a preset trajectory; The side of the swing plate (51) facing the slider (3) is an inclined surface; during the process of the blade (2) rotating from its surface perpendicular to the inner cavity axis to parallel to the inner cavity axis, the slider (3) abuts against the inclined surface, so that the swing plate (51) swings in the opposite direction along the preset trajectory and the first elastic member (52) undergoes elastic deformation. Furthermore, a groove (511) is provided on the swing end face of the swing plate (51); when the blade rotates to a position where its surface is parallel to the axial direction of the inner cavity, the first elastic member (52) can drive the swing plate (51) to swing along the preset trajectory so that the sliding member (3) is embedded in the groove (511).

3. The regulating structure for smoke exhaust ducts as described in claim 2, characterized in that, The swing plate (51) has a pull rod (512) extending toward the first elastic member (52), and the extended end of the pull rod (512) passes through the mounting base (1) and extends out.

4. The regulating structure for smoke exhaust ducts as described in claim 1, characterized in that, At least one transmission plate (31) is fixedly connected to the sliding member (3). The transmission plate (31) extends along the arrangement direction of the blades (2) and is slidably connected to the mounting base (1) along the arrangement direction of the blades (2).

5. The adjusting structure for smoke exhaust ducts as described in claim 4, characterized in that, The transmission structure (4) includes: A guide groove (41) is formed on the transmission plate (31), and its opening direction is perpendicular to the axial direction of the inner cavity and also perpendicular to the arrangement direction of the blades (2); and A transmission rod (42) is fixedly connected to the blade (2), and the extended end of the transmission rod (42) has a bent portion that is fitted into the guide groove (41); When the transmission plate (31) moves with the sliding member (3), the bent part slides in the guide groove (41) to make the blade (2) swing.

6. The adjusting structure for smoke exhaust ducts as described in claim 4, characterized in that, A second elastic element (311) is provided between the transmission plate (31) and the mounting base (1). When the blade (2) swings from a state where its surface is perpendicular to the axial direction of the inner cavity, the second elastic element (311) undergoes elastic deformation to be adapted to drive the blade (2) to swing to a state where its surface is perpendicular to the axial direction of the inner cavity.

7. The regulating structure for smoke exhaust ducts as described in claim 1, characterized in that, The sliding member (3) is connected to a pull rope (32) on the side facing away from the blade group. The pull rope (32) passes through the mounting base (1) on the side of the sliding member (3) facing away from the blade group and extends out to be pulled by a person so that the sliding member (3) moves away from the blade group until each blade (2) is in a state where its surface is parallel to the axial direction of the inner cavity.

8. The regulating structure for smoke exhaust ducts as described in claim 1, characterized in that, The mounting base (1) also includes: A baffle (6) is fixedly disposed in the inner cavity and positioned between the blade assembly and the sliding member (3) to restrict the passage of flue gas.

9. A smoke extraction system, characterized in that, It includes a smoke exhaust duct (7) and an adjustment structure installed on the smoke exhaust duct (7) according to any one of claims 1-8.

10. The smoke extraction system as described in claim 9, characterized in that, Also includes: A control element (8), connected to each of the sliding elements (3), is used to move the sliding element (3) to a position where each of the corresponding blades (2) is parallel to the axial direction of the inner cavity on its surface.

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