Sealing device

Abstract

The utility model relates to the technical field of air pipe sealing, and discloses a sealing device which comprises a plate suitable for covering an air pipe opening of an air pipe, and a fixing part is arranged in the area, close to the air pipe opening, of the outer side wall of the air pipe. One end of the connecting assembly is fixedly connected with the edge area of the plate, and the other end of the connecting assembly is suitable for being detachably connected with the fixing part so that the plate can be connected with the air pipe. According to the sealing device, the air pipe opening is covered with the plate, one end of the connecting assembly is fixedly connected with the plate, and the other end of the connecting assembly is detachably connected with the air pipe, so that the plate can be disassembled and assembled on the air pipe conveniently, and the situation that the air pipe opening is covered with a protective film, so that the next section of air pipe is installed is avoided. And the protective film cannot be dismounted in time or cannot be dismounted thoroughly.

Description

Technical Field

[0001] The utility model relates to the technical field of air duct sealing, in particular to a sealing device. Background Art

[0002] Factories or workshops in the fields of medical, pharmaceutical, microelectronics processing, etc. have high requirements for the cleanliness of the production environment. In order to ensure the cleanliness of the production environment, the air duct needs to be installed cleanly. The installation method of clean air ducts usually adopts the installation method of installing the air duct section by section and removing the plastic protective film at the air duct opening section by section. However, when using this installation method, since the plastic protective film is not easy to remove, when installing the next section of the air duct, there will be a problem that the plastic protective film at the opening of the next section of the air duct cannot be removed in time or is not removed cleanly. Utility Model Content

[0003] In view of this, the utility model provides a sealing device to solve the problem that the plastic protective film at the opening of the next section of air duct cannot be removed in time or is not removed cleanly when installing the next section of air duct.

[0004] The utility model provides a sealing device, comprising:

[0005] The plate is suitable for covering the air duct opening of the air duct, and a fixing portion is provided in an area of ​​the outer wall of the air duct near the air duct opening;

[0006] The connecting component has one end fixedly connected to the edge area of ​​the plate and the other end suitable for detachable connection with the fixing part so as to connect the plate to the air duct.

[0007] Beneficial effect: the air duct opening is covered by the plate, and one end of the connecting component is fixedly connected to the plate, and the other end is detachably connected to the air duct, so as to facilitate the disassembly and assembly of the plate on the air duct, thereby avoiding the problem of using a protective film to cover the air duct opening, that the protective film cannot be removed in time or is not removed cleanly when installing the next section of the air duct.

[0008] In an optional implementation, the length of the fixing portion along a direction parallel to the axis of the air duct is S, wherein 1 mm ≤ S ≤ 5 mm.

[0009] Beneficial effect: By making the fixing part have a certain thickness in a direction parallel to the axis of the air duct, after the connecting component and the fixing part form a detachable connection, the fixing part is prevented from being broken by the pulling force of the connecting component, thereby ensuring the reliability and stability of the connection between the connecting component and the air duct through the fixing part.

[0010] In an optional embodiment, the fixing portion includes a fixing plate, the plane where the fixing plate is located is set at an angle to the axial direction of the air duct, one end of the connecting component is fixedly connected to the plate, and the other end is suitable for detachable connection with the fixing plate.

[0011] In an optional embodiment, along a direction perpendicular to the axis of the air duct, the spacing between the outer wall of the air duct and the outer edge of the plate is M, wherein 10 mm ≤ M ≤ 20 mm.

[0012] Beneficial effect: By providing a certain spacing between the outer wall of the air duct and the outer edge of the plate, space is reserved for the fixed connection between the connecting components and the edge area of ​​the plate.

[0013] In an optional embodiment, the connecting assembly includes an elastic member and a clamping member, one end of the elastic member is fixedly connected to the plate, and the other end is fixedly connected to the clamping member, and the clamping member has a first state of clamping the fixing portion and a second state of loosening the fixing portion.

[0014] Beneficial effect: The plate and the clamping member are connected by an elastic member. Since the elastic member is elastic, the distance between the clamping member and the plate can be easily adjusted, so that it is suitable for different distances between the fixing part and the plate, thereby improving the applicability of the sealing device.

[0015] In an optional embodiment, the clamping member includes two spaced-apart limit plates and a support plate fixedly connecting the two limit plates; any one of the two limit plates is penetrated by a bolt that matches its thread, and the bolt is suitable for pressing the fixing part against the other limit plate.

[0016] Beneficial effect: The bolt is threadedly matched with a limiting plate to press the fixing part against another limiting plate, so that the clamping member can be switched between the first state and the second state by rotating the bolt, which is simple to operate and helps to improve efficiency.

[0017] In an optional embodiment, a protrusion is provided on the side of the plate facing the air duct corresponding to the air duct opening, and at least a part of the protrusion is suitable for extending into the air duct and abutting against the inner wall of the air duct.

[0018] Beneficial effect: By making at least a part of the protrusion extend into the air duct and abut against the inner wall of the air duct, the connection stability between the plate and the air duct can be improved while blocking the air duct opening.

[0019] In an optional implementation, along the axial direction of the air duct, the length of the protrusion is L, where L is ≥ 80 mm.

[0020] Beneficial effect: By making the length of the protrusion greater than or equal to 80 mm, the protrusion can extend into the air duct a sufficient distance, thereby ensuring a good blocking effect and enhancing the connection stability.

[0021] In an optional embodiment, a rubber pad is fixedly connected to the side of the protrusion corresponding to the inner wall of the air duct, and the side of the rubber pad facing away from the protrusion is suitable for abutting against the inner wall of the air duct.

[0022] Beneficial effect: By arranging a rubber pad on the side of the protrusion corresponding to the inner wall of the air duct, the side of the rubber pad facing away from the protrusion is in contact with the inner wall of the air duct, thereby enhancing the fit between the protrusion and the inner wall of the air duct, thereby ensuring that the sealing device seals the air duct opening.

[0023] In an optional embodiment, the thickness of the rubber pad is H, wherein 0.5 mm≤H≤1.5 mm.

[0024] Beneficial effect: By making the rubber pad have a certain thickness, the rubber pad is prevented from being too thin, which is conducive to ensuring that the rubber pad has a good effect of enhancing the fit between the protrusion and the inner wall of the air duct, and avoids the rubber pad being too thick, causing installation difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the sealing device and the air duct in the exploded state of the utility model;

[0027] Figure 2 It is a schematic diagram of the sealing device and the air duct installation state of the utility model;

[0028] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0029] Figure 4 This is a front view of the sealing device and the air duct installed in the utility model;

[0030] Figure 5 It is a schematic diagram of the mounting frame of the utility model.

[0031] Description of reference numerals:

[0032] 1. Air duct; 11. Fixing part; 12. Air duct outlet; 2. Plate; 3. Connecting assembly; 31. Connecting plate; 32. Elastic member; 33. Clamping member; 331. Support plate; 332. Limiting plate; 333. Bolt; 4. Bump; 5. Rubber pad. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Taking the air duct 1 used in the vaccine plant as an example, since the vaccine plant needs to strictly control the concentration of particles, which is mainly reflected in the control of the amount of dust and bacteria, in order to ensure the cleanliness and hygiene of the production environment and prevent pollution during the vaccine production process, efficient air duct application technology is required. In order to ensure the clean installation of the air duct 1, the installation method of installing the plastic protective film section by section and removing it section by section is usually adopted when installing the air duct 1. However, this method will have the problem that when installing the next section of the air duct 1, the plastic protective film of the next section of the air duct 1 cannot be removed in time, or is not removed cleanly. In addition, the frequent use of the plastic protective film and the inability to reuse it also poses potential pollution to the environment and increases construction costs.

[0038] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0039] According to an embodiment of the utility model, a sealing device is provided, comprising:

[0040] The plate 2 is suitable for covering the air duct opening 12 of the air duct 1, and a fixing portion 11 is provided in an area near the air duct opening 12 on the outer wall of the air duct 1;

[0041] The connecting component 3 has one end fixedly connected to the edge area of ​​the plate 2 and the other end suitable for being detachably connected to the fixing portion 11 so as to connect the plate 2 to the air duct 1 .

[0042] The sealing device provided in this embodiment covers the air duct opening 12 by means of the plate 2, and is fixedly connected to the plate 2 at one end by means of a connecting component 3, and is detachably connected to the air duct 1 at the other end, so as to facilitate the disassembly and assembly of the plate 2 on the air duct 1, thereby avoiding the problem that the protective film cannot be removed in time or is not removed cleanly when installing the next section of the air duct 1 due to the use of a protective film to cover the air duct opening 12.

[0043] Specifically, the plate 2 can be a metal plate such as a steel plate, or a non-metal plate such as a wood plate. Preferably, the plate 2 is a straight plate, and the thickness of the plate 2 is greater than or equal to 1 mm. The fixing portion 11 protrudes from the outer wall of the air duct 1. The fixing portion 11 can be integrated with the air duct 1, or can be fixedly connected to the air duct 1 in a split manner. The fixed connection forms include threaded connection, pin connection, bonding, etc. There is a distance between the fixing portion 11 and the plate 2, so that the connecting component 3 can be connected between the fixing portion 11 and the plate 2, wherein one end of the connecting component 3 is fixedly connected to the plate 2, and the other end is detachably connected to the fixing portion 11. When the other end of the connecting component 3 is in a connected state with the fixing part 11, the plate 2 is connected to the air duct 1. When the other end of the connecting component 3 is in a disassembled state with the fixing part 11, it is convenient to remove the plate 2 from the air duct 1, thereby realizing the disassembly and assembly of the plate 2 on the air duct 1 through the disassembly and assembly of the other end of the connecting component 3 with the fixing part 11, thereby realizing the turnover use on different air ducts 1, avoiding the problem of failure to remove in time or unclean removal caused by using a plastic protective film to cover the air duct opening 12, and avoiding potential pollution to the environment caused by frequent use of the plastic film. In addition, since the sealing device provided in this embodiment can be reused, the construction cost can be reduced compared with the one-time use of the plastic protective film.

[0044] The number of the connecting components 3 includes at least two. As a feasible implementation form, two connecting components 3 are respectively arranged on two opposite sides of the plate 2, so that the plate 2 is connected to the air duct 1 through four connecting components 3.

[0045] In some embodiments, in combination Figures 1 to 5 As shown, the length of the fixing portion 11 along the direction parallel to the axis of the air duct 1 is S, wherein 1 mm ≤ S ≤ 5 mm.

[0046] The sealing device provided in this embodiment enables the fixing portion 11 to have a certain thickness in a direction parallel to the axis of the air duct 1, so as to prevent the fixing portion 11 from being broken by the pulling force of the connecting component 3 after the connecting component 3 and the fixing portion 11 form a detachable connection, thereby ensuring the reliability and stability of the connection between the connecting component 3 and the air duct 1 through the fixing portion 11.

[0047] In some embodiments, in combination Figures 1 to 5 As shown, the fixing portion 11 includes a fixing plate, the plane where the fixing plate is located is set at an angle to the axial direction of the air duct 1, one end of the connecting component 3 is fixedly connected to the plate 2, and the other end is suitable for detachable connection with the fixing plate.

[0048] Specifically, the fixing portion 11 can be a fixing plate, and the plane where the fixing plate is located is perpendicular to the axis of the air duct 1; or, the plane where the fixing plate is located forms an acute angle with the axis of the air duct 1, and the end of the fixing plate away from the air duct 1 is inclined toward the direction away from the plate 2. As a feasible implementation form, the fixing plate is integral and arranged along the outer wall of the air duct 1 around the axis of the air duct 1; as an additional implementation form, the fixing plate is split and multiple fixing plates are arranged at intervals along the outer wall of the air duct 1 around the axis of the air duct 1, and correspond to the position of the connecting component 3, so that the connecting component 3 can be detachably connected to the air duct 1 through the fixing plate, thereby forming a detachable connection between the plate 2 and the air duct 1.

[0049] The fixing portion 11 may also be a fixing rod, the axis of which is perpendicular to the axis of the air duct 1; or, the axis of the fixing rod is arranged at an acute angle to the axis of the air duct 1, and the end of the fixing rod away from the air duct 1 is inclined toward the side away from the plate 2. The number of fixing rods matches the number of connecting components 3, and a plurality of fixing rods are arranged at intervals around the axis of the air duct 1 along the outer wall of the air duct 1, and correspond to the positions of the connecting components 3, so that the plate 2 and the air duct 1 are detachably connected through the detachable connection between the connecting components 3 and the fixing rods.

[0050] In some embodiments, in combination Figures 1 to 5 As shown, along the direction perpendicular to the axis of the air duct 1, the spacing between the outer wall of the air duct 1 and the outer edge of the plate 2 is M, wherein 10mm≤M≤20mm.

[0051] The sealing device provided in this embodiment allows a certain spacing between the outer wall of the air duct 1 and the outer edge of the plate 2, so as to reserve space for the fixed connection between the connecting component 3 and the edge area of ​​the plate 2.

[0052] Specifically, one end of the connecting component 3 is fixedly connected to the edge area of ​​the main plane of the plate 2 close to the air duct 1. According to the specifications of the air duct 1, a plate 2 of appropriate specifications is selected so that after the plate 2 covers the air duct opening 12, the spacing between the outer edge of the plate 2 and the outer side wall of the air duct 1 is greater than or equal to 10 mm and less than or equal to 20 mm, so as to reserve space for the fixed connection of one end of the connecting component 3 with the plate 2. As an additional implementation form, one end of the connecting component 3 can also be fixedly connected to the edge area of ​​the plate 2 away from the main plane of the air duct 1, or fixedly connected to the side between the two main planes of the plate 2.

[0053] In some embodiments, in combination Figures 1 to 5 As shown, the connecting assembly 3 includes an elastic member 32 and a clamping member 33. One end of the elastic member 32 is fixedly connected to the plate 2, and the other end is fixedly connected to the clamping member 33. The clamping member 33 has a first state of clamping the fixing portion 11 and a second state of loosening the fixing portion 11.

[0054] The sealing device provided in this embodiment connects the plate 2 and the clamping member 33 via an elastic member 32. Since the elastic member 32 is elastic, the distance between the clamping member 33 and the plate 2 can be easily adjusted, so that it is suitable for use between the fixing portion and the plate 2 with different distances, thereby improving the applicability of the sealing device.

[0055] Specifically, the elastic member 32 includes a spring and an elastic rope. When the plate 2 is installed on the air duct 1 through the connecting assembly 3, the elastic member 32 is in a stretched state, thereby preventing the plate 2 from falling off the air duct 1.

[0056] In some embodiments, in combination Figures 1 to 5 As shown, the clamping member 33 includes two spaced apart limiting plates 332 and a support plate 331 fixedly connecting the two limiting plates 332 ; any one of the two limiting plates 332 is penetrated by a bolt 333 threadably matched with the bolt 333 , and the bolt 333 is suitable for pressing the fixing portion 11 against the other limiting plate 332 .

[0057] In the sealing device provided in this embodiment, the bolt 333 is threadedly matched with a limiting plate 332 to press the fixing part 11 against the other limiting plate 332, so that the clamping member 33 can be switched between the first state and the second state by rotating the bolt 333, which is simple to operate and helps to improve efficiency.

[0058] Preferably, the two limiting plates 332 are parallel to each other, and the projections of the two limiting plates 332 overlap along the direction perpendicular to the plane where the limiting plates 332 are located. One end of the support plate 331 is fixedly connected to one of the limiting plates 332, and the other end is fixedly connected to the other limiting plate 332, so as to support and fix the relative positions of the two limiting plates 332. A threaded hole is provided on one of the limiting plates 332, and a bolt 333 that is threadedly matched with the bolt 333 is passed through the threaded hole, and the axis of the bolt 333 is set at an angle to the plane where the limiting plates 332 are located. A partial area of ​​the bolt 333 is located between the two limiting plates 332, and by rotating around its own axis, under the action of the thread, the bolt 333 has a third state close to the other limiting plate 332 and a fourth state away from the other limiting plate 332. Bring the clamping member 33 close to the fixing portion 11 and make a partial area of ​​the fixing portion 11 between the two limiting plates 332. At this time, rotate the bolt 333 to make the bolt 333 close to the other limiting plate 332 until the fixing portion 11 is clamped between the bolt 333 and the other limiting plate 332, so that the clamping member 33 is in the first state of clamping the fixing portion 11. At this time, the connecting component 3 and the fixing portion 11 are in a connected state, so as to facilitate the connection between the plate 2 and the air duct 1; rotate the bolt 333 to move the bolt 333 away from the other limiting plate 332 until the fixing portion 11 can be disengaged from the clamping member 33, so that the clamping member 33 is in the second state. At this time, the connecting component 3 and the fixing portion 11 are in a disassembled state. When all the connecting components 3 and the fixing portion 11 are in the disassembled state, the plate 2 can be removed from the air duct 1.

[0059] In addition, the limiting plate 332 can be replaced by a limiting rod, and the supporting plate 331 can be replaced by a supporting rod. The two ends of the supporting rod are respectively fixedly connected to a limiting rod, and along the axis direction of the supporting rod, the projections of the two limiting rods overlap. The bolt 333 is passed through one of the limiting rods and is threadedly engaged with the limiting rod. A partial area of ​​the fixing portion 11 is placed between the two limiting rods, and the bolt 333 rotates around its own axis to be suitable for pressing the fixing portion 11 against the other limiting rod, thereby realizing the function of the clamping member 33 clamping the fixing portion 11.

[0060] In some embodiments, in combination Figures 1 to 5 As shown, a protrusion 4 is provided on the side of the plate 2 facing the air duct 1 corresponding to the air duct opening 12 , and at least a part of the protrusion 4 is suitable for extending into the air duct 1 and abutting against the inner wall of the air duct 1 .

[0061] The sealing device provided in this embodiment can improve the connection stability between the plate 2 and the air duct 1 while sealing the air duct opening 12 by allowing at least a portion of the protrusion 4 to extend into the air duct 1 and abut against the inner wall of the air duct 1.

[0062] Specifically, the protrusion 4 can be prepared integrally with the plate 2, or can be fixedly connected to the plate 2 in a split manner, and the fixed connection forms include bolt connection, pin connection, and bonding. When the plate 2 and the protrusion 4 are both made of metal, they can also be welded. The connection component 3 also includes a connection plate 31. When one end of the connection component 3 is fixedly connected to the edge area of ​​the main plane of the plate 2 close to the air duct 1, the connection plate 31 is arranged on the side of the plate 2 facing the air duct 1. The position of the connection plate 31 on the plate 2 avoids the position of the protrusion 4. The connection plate 31 is fixedly connected to the plate 2. The fixed connection forms include bolt connection, pin connection, and bonding. When the plate 2 and the connection plate 31 are both made of metal, they can also be welded. The side of the connection plate 31 facing away from the plate 2 is fixedly connected to the elastic member 32. The fixed connection forms include bolt connection and pin connection. When the connection plate 31 and the elastic member 32 are both made of metal, they can also be welded.

[0063] In some embodiments, in combination Figures 1 to 5 As shown, along the axial direction of the air duct 1, the length of the protrusion 4 is L, where L≥80mm.

[0064] The sealing device provided in this embodiment has a length of the protrusion 4 greater than or equal to 80 mm so that the protrusion 4 can extend into the air duct 1 a sufficient distance, thereby ensuring a good sealing effect and enhancing the connection stability.

[0065] Specifically, by making the length of the protrusion 4 greater than or equal to 80 mm, it is prevented that the length of the protrusion 4 is too short, thereby failing to achieve a good blocking effect and enhance the connection stability.

[0066] In some embodiments, in combination Figures 1 to 5 As shown, a rubber pad 5 is fixedly connected to the side of the protrusion 4 corresponding to the inner wall of the air duct 1 , and the side of the rubber pad 5 facing away from the protrusion 4 is suitable for abutting against the inner wall of the air duct 1 .

[0067] The sealing device provided in this embodiment is provided with a rubber pad 5 on the side of the inner wall of the air duct 1 corresponding to the protrusion 4, so that the side of the rubber pad 5 facing away from the protrusion 4 abuts against the inner wall of the air duct 1, thereby enhancing the fit between the protrusion 4 and the inner wall of the air duct 1, and further ensuring that the sealing device seals the air duct opening 12.

[0068] Specifically, the rubber pad 5 is arranged along the side of the protrusion 4 around the axis of the air duct 1, and the rubber pad 5 can completely cover the side of the protrusion 4 corresponding to the inner wall of the air duct 1, or can partially cover the side of the protrusion 4 corresponding to the inner wall of the air duct 1. The rubber pad 5 is fixedly connected to the protrusion 4, and the fixed connection form includes bolt connection and bonding.

[0069] In some embodiments, in combination Figures 1 to 5As shown, the thickness of the rubber pad 5 is H, wherein 0.5 mm ≤ H ≤ 1.5 mm.

[0070] The sealing device provided in this embodiment makes the rubber pad 5 have a certain thickness, thereby preventing the rubber pad 5 from being too thin, which results in the rubber pad 5 not having a good effect of enhancing the fit between the protrusion 4 and the inner wall of the air duct 1, and preventing the rubber pad 5 from being too thick, which causes installation difficulties.

[0071] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A sealing device, characterized in that: include: A plate (2) adapted to cover an air duct opening (12) of an air duct (1), wherein a fixing portion (11) is provided on an outer wall of the air duct (1) in a region close to the air duct opening (12); A connecting component (3) has one end fixedly connected to the edge region of the plate (2) and the other end adapted to be detachably connected to the fixing portion (11) so as to connect the plate (2) to the air duct (1).

2. The sealing device according to claim 1, characterized in that: The length of the fixing portion (11) in a direction parallel to the axis of the air duct (1) is S, wherein 1 mm ≤ S ≤ 5 mm.

3. The sealing device according to claim 1, characterized in that: The fixing portion (11) comprises a fixing plate, the plane where the fixing plate is located is arranged at an angle with the axial direction of the air duct (1), one end of the connecting component (3) is fixedly connected to the plate (2), and the other end is suitable for detachable connection with the fixing plate.

4. The sealing device according to claim 1, characterized in that: Along a direction perpendicular to the axis of the air duct (1), the spacing between the outer wall of the air duct (1) and the outer edge of the plate (2) is M, wherein 10 mm ≤ M ≤ 20 mm.

5. The sealing device according to claim 1, characterized in that: The connecting assembly (3) comprises an elastic member (32) and a clamping member (33); one end of the elastic member (32) is fixedly connected to the plate (2), and the other end is fixedly connected to the clamping member (33); the clamping member (33) has a first state of clamping the fixing portion (11) and a second state of loosening the fixing portion (11).

6. The sealing device according to claim 5, characterized in that: The clamping member (33) comprises two spaced-apart limiting plates (332) and a supporting plate (331) fixedly connecting the two limiting plates (332); any one of the two limiting plates (332) is provided with a bolt (333) threadedly matched therewith, and the bolt (333) is suitable for pressing the fixing portion (11) against the other limiting plate (332).

7. The sealing device according to any one of claims 1 to 6, characterized in that: A protrusion (4) is provided on the side of the plate (2) facing the air duct (1) corresponding to the air duct opening (12); at least a part of the protrusion (4) is suitable for extending into the air duct (1) and abutting against the inner wall of the air duct (1).

8. The sealing device according to claim 7, characterized in that: Along the axial direction of the air duct (1), the length of the protrusion (4) is L, where L is ≥ 80 mm.

9. The sealing device according to claim 7, characterized in that: The side of the protrusion (4) corresponding to the inner wall of the air duct (1) is fixedly connected with a rubber pad (5), and the side of the rubber pad (5) facing away from the protrusion (4) is suitable for abutting against the inner wall of the air duct (1).

10. The sealing device according to claim 9, characterized in that: The thickness of the rubber pad (5) is H, wherein 0.5 mm ≤ H ≤ 1.5 mm.

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