Check valve mounting mechanism and flue closure mechanism

Abstract

This utility model provides a check valve installation mechanism and a flue sealing mechanism, belonging to the field of flue sealing, to solve the problem of oil fumes seeping into the user's room through gaps such as the valve body edge and the connection with the wall; it includes a first fixing member with a square first receiving groove; a first elastic sealing member disposed in the first receiving groove; a second fixing member with a through hole, the side wall of the through hole being bent towards the wall to form a square limiting part, which is used to insert into the first receiving groove; and a second elastic sealing member disposed on the side wall of the second fixing member facing the wall, for abutting against the wall; through the action of the first elastic sealing member and the second elastic sealing member, gaps between the second fixing member and the wall caused by protrusions or grooves on the installation wall, as well as gaps at the connection between the first fixing member and the second fixing member caused by protrusions or grooves, can be effectively avoided, ensuring that a seal can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of flue sealing, and in particular relates to a check valve installation mechanism and a flue sealing mechanism. Background Technology

[0002] In modern urban residential buildings, public exhaust ducts have become a standard feature in high-rise apartments. However, since public exhaust ducts are usually vertical single-channel structures, when residents on different floors use the exhaust equipment simultaneously or at different times, the "exhaust duct draft effect" is easily triggered by air pressure imbalance. This causes kitchen fumes from different households to "cross-contaminate" each other, and even "backflow" of fumes, seriously affecting the living environment and quality of life.

[0003] To address this issue, the common practice is to install a backflow preventer at the interface between the user's exhaust pipe and the shared flue. These preventers typically employ a one-way valve structure, relying on the airflow pressure during range hood startup to open the valve and allow exhaust. When the machine stops, the valve closes under gravity or spring force, theoretically preventing the backflow of fumes from the shared flue. However, in practice, the preventer only blocks the reverse airflow through the valve opening and cannot effectively seal the gap between the valve body and the wall mounting hole. Therefore, even when the valve is closed, fumes from the shared flue can still seep into the user's room through gaps such as the valve body edge and the connection point with the wall, failing to completely solve the problems of backflow and odor transfer. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a check valve installation mechanism and a flue sealing mechanism to solve the problem that oil fumes in public flues still seep into the user's room through gaps such as the valve body edge and the connection with the wall in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides a check valve installation mechanism, including a first fixing member, a first elastic sealing member, a second fixing member, and a second elastic sealing member; the first fixing member is disposed on a valve seat frame; the first fixing member has a square first receiving groove; the first elastic sealing member is disposed in the first receiving groove; the second fixing member is detachably connected to the first fixing member, and the second fixing member has a through hole, the side wall of the through hole is bent towards the wall to form a square limiting part, the limiting part is used to insert into the first receiving groove, and the first elastic sealing member is located between the first receiving groove and the limiting part; the second elastic sealing member is disposed on the side wall of the second fixing member facing the wall, and is used to abut against the wall.

[0006] Optionally, the first resilient seal is provided with a second receiving groove for insertion of the limiting part.

[0007] Optionally, the second fastener is bolted to the first fastener.

[0008] On the other hand, a flue sealing mechanism is also provided, including: a check valve mounting mechanism as described above, further including a plurality of first valve plates, a plurality of second valve plates, a plurality of reset components, and a sealing component; the valve seat frame is a square channel formed by a plurality of interconnected side plates; the number of first valve plates is equal to and corresponds one-to-one with the number of side plates of the valve seat frame, the first end of each first valve plate is rotatably connected to the corresponding side plate, and can slide vertically on the side plate; the number of second valve plates is equal to and corresponds one-to-one with the first valve plates, the first end of the second valve plate is rotatably connected to the second end of the corresponding first valve plate, and the second end of the second valve plate is rotatably connected to the corresponding side plate; the number of reset components is equal to and corresponds one-to-one with the number of first valve plates. In a one-to-one correspondence, a reset component is disposed on the side plate, which acts on the first end of the first valve plate to provide a force that causes the first end of the first valve plate to slide upward. Under the force of the reset component, all the first valve plates retract inward and combine to form a first guide cone with a sealed top and an open bottom, and all the second valve plates retract inward and combine to form a second guide cone with a sealed bottom and an open top. The bottom end of the first guide cone is connected to the smoke exhaust device, and the top end of the second guide cone faces the inside of the common flue. A sealing component is disposed on the top of the valve seat frame, which abuts against the side wall of each second valve plate located in the second guide cone to seal the gap between the second valve plate and the side plate.

[0009] Optionally, it also includes multiple guide components, the number of which is equal to and corresponds one-to-one with the number of first valve plates; the guide components are disposed on the side plate, and the first end of the first valve plate is rotatably connected to the corresponding guide component.

[0010] Optionally, the guide assembly includes a guide member and a slider. The guide member is disposed on the side plate, the slider is slidably connected to the guide member, and the first end of the first valve plate is rotatably connected to the slider.

[0011] Optionally, the reset assembly includes at least one sleeve, at least one guide post, and at least one elastic element; the sleeve, guide post, and elastic element are arranged in a one-to-one correspondence; one end of the guide post is connected to the side plate, and the other end is slidably disposed in the sleeve, and the sleeve is connected to the slider; the elastic element is sleeved on the guide post, one end of which is connected to the sleeve and the other end of which is connected to the side plate.

[0012] Optionally, the second end of the first valve plate includes a mounting portion arranged parallel to the horizontal plane. A protrusion is provided on the side wall of the mounting portion facing the internal space of the first guide cone. The protrusion includes a first guide surface and a second guide surface arranged opposite to each other. The angle formed by the first guide surface and the side wall of the first valve plate facing the internal space of the first guide cone is an acute angle. When all the first valve plates are retracted, the second guide surfaces of each protrusion surround and form a third guide cone with a closed top and an open bottom.

[0013] Optionally, each side plate has an inclined first guide plate at its bottom, and all the first guide plates together form a first truncated pyramid structure with openings at both the top and bottom. The top opening area of ​​the first truncated pyramid structure is larger than the bottom opening area. The top opening area of ​​the first truncated pyramid structure is less than or equal to the area of ​​the closed plane formed by the side walls of each mounting part facing the internal space of the first guide cone when all the first valve plates are retracted, and is larger than the bottom opening area of ​​the third guide cone.

[0014] Optionally, the enclosure assembly includes multiple second guide vanes; each side plate has an inclined second guide vane at its top, and all the second guide vanes together form a second frustum structure with openings at both the top and bottom, the top opening area of ​​the second frustum structure being larger than the bottom opening area; the top end of the second guide vane away from the side plate abuts against the side wall of the second valve plate located on the same side plate; the bottom opening area of ​​the second frustum structure is greater than or equal to the top opening area of ​​the first frustum structure.

[0015] As described above, the check valve installation mechanism and flue sealing mechanism provided by this utility model have at least the following beneficial effects: 1. Through the action of the first elastic seal and the second elastic seal, gaps between the second fastener and the wall can be effectively avoided due to protrusions or grooves on the wall, as well as gaps at the connection between the first fastener and the second fastener due to protrusions or grooves, thus ensuring a seal.

[0016] 2. Excellent backflow prevention performance: The double-layer sealing structure formed by the first and second guide cones, combined with the auxiliary sealing effect of the negative pressure of the common flue on the second valve plate, achieves sealing in non-smoke exhaust state, effectively preventing backflow of oil fumes and cross-contamination of odors.

[0017] 3. Sensitive and reliable opening and closing: The valve opens automatically using the power of the exhaust airflow, requiring no electricity or manual operation. The unique protruding design divides the airflow into two streams, each acting on a different location, generating sufficient opening force with a relatively small amount of oil fumes, resulting in a rapid response.

[0018] 4. High smoke extraction efficiency: The three-stage flow guiding structure (first truncated pyramid structure, first flow guiding cone, and third flow guiding cone) effectively gathers and disperses oil fumes, forming a concentrated airflow. The streamlined smoke passage formed after activation has low resistance, ensuring smooth smoke extraction and promoting efficient operation of the range hood.

[0019] 5. High sealing reliability: It adopts a multi-stage sealing design, including the edge of the valve plate fitting together when the valve plate is closed, and the dynamic seal between the second valve plate and the second guide plate, to ensure effective prevention of leakage under various working conditions. Attached Figure Description

[0020] Figure 1 The diagram shown is an overall structural schematic of a check valve installation mechanism according to this utility model.

[0021] Figure 2 The diagram shown is an exploded view of a check valve installation mechanism according to this utility model.

[0022] Figure 3 The diagram shown is a structural schematic of a flue sealing mechanism according to this utility model.

[0023] Figure 4 The diagram shown is an angle view of a flue sealing mechanism of this utility model, omitting one of the side plates and the structure disposed on the side plate.

[0024] Figure 5 The diagram shown is a structural schematic of one of the side plates of a flue sealing mechanism according to this utility model.

[0025] Figure 6 The diagram shown is a schematic diagram of a flue sealing mechanism of this utility model, omitting one of the side plates and the structure disposed on the side plate from another angle.

[0026] Component designation explanation: 1. First fixing member; 111. First receiving groove; 2. First elastic seal; 21. Second receiving groove; 3. Second fixing member; 4. Second elastic seal; 5. Valve seat frame; 51. Side plate; 6. First valve plate; 61. Mounting part; 62. Protrusion; 621. First guide surface; 622. Second guide surface; 7. Second valve plate; 8. Reset assembly; 81. Sleeve; 82. Guide post; 83. Elastic member; 9. Sealing assembly; 91. Second guide plate; 10. Guide assembly; 101. Guide member; 102. Slider; 11. First guide plate. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] Please refer to all the accompanying drawings below. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0029] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0030] Please see Figure 1-2 This utility model provides a check valve installation mechanism, including a first fixing member 1, a first elastic sealing member 2, a second fixing member 3, and a second elastic sealing member 4; The first fixing member 1 is disposed on the valve seat frame 5, and the first fixing member 1 is provided with a square first receiving groove 111; the first fixing member 1 can be disposed on the outer side wall of the valve seat frame 5 by means of welding or other methods.

[0031] The first elastic seal 2 is disposed within the first receiving groove 111; the second fixing member 3 is detachably connected to the first fixing member 1, and the second fixing member 3 is provided with a through hole. The side wall of the through hole is bent towards the wall to form a square limiting part, which is used to insert into the first receiving groove 111, and the first elastic seal 2 is located between the first receiving groove 111 and the limiting part to seal the connection between the first fixing member 1 and the second fixing member 3. The second elastic seal 4 is disposed on the side wall of the second fixing member 3 facing the wall, and is used to abut against the wall to seal the connection between the second fixing member 3 and the cavity.

[0032] The first elastic sealing member 2 may be provided with a second receiving groove 21 for the insertion of the limiting part. During installation, the limiting part can be inserted into the second receiving groove 21 first, and then the limiting part and the second receiving groove 21 can be inserted into the first receiving groove 111 as a whole to achieve a seal. The second fixing member 3 and the first fixing member 1 can be bolted together to fix the second fixing member 3 to the wall. The first elastic sealing member 2 and the second elastic sealing member 4 can be elastic sealing structures made of materials such as rubber, which is not limited in this embodiment.

[0033] This embodiment effectively avoids gaps between the second fixing member 3 and the wall caused by protrusions or grooves on the installation wall, as well as gaps at the connection between the first fixing member 1 and the second fixing member 3 caused by protrusions or grooves, thus ensuring a seal. Furthermore, the design of the first fixing member 1 and the second fixing member 3 enhances the versatility of this installation mechanism. Specifically, if the size of the interface at the public flue is uneven, different sizes of second fixing members 3 can be selected to complete the installation of the check valve.

[0034] Please see Figure 3-6 On the other hand, a flue sealing mechanism is also provided, which includes the aforementioned check valve mounting mechanism, and further includes a valve seat frame 5, a plurality of first valve plates 6, a plurality of second valve plates 7, a plurality of reset components 8 and a sealing component 9.

[0035] The valve seat frame 5 is a square channel formed by multiple interconnected side plates 51. There can be three, four, five, or other side plates 51. In this embodiment, there are four side plates 51, which together form a rectangular valve seat frame 5. The valve seat frame 5 is hollow inside.

[0036] The number of first valve plates 6 is equal to and corresponds one-to-one with the number of side plates 51 of the valve seat frame 5. The first end of each first valve plate 6 is rotatably connected to the corresponding side plate 51 and can slide vertically on the side plate 51. Specifically, each side plate 51 is provided with a guide assembly 10, and the first end of the first valve plate 6 is rotatably connected to the corresponding guide assembly 10. The guide assembly 10 is used to enable the first end of the first valve plate 6 to slide vertically on the side plate 51. The guide assembly 10 may include a guide member 101 and a slider 102. The guide member 101 may be a guide rod or a guide rail, etc. The guide member 101 is provided on the side plate 51 and is vertically arranged. The slider 102 is slidably connected to the guide member 101, and the first end of the first valve plate 6 is rotatably connected to the slider 102, specifically by hinge.

[0037] The number of second valve plates 7 is equal to that of the first valve plates 6 and they correspond one-to-one. The first end of the second valve plate 7 is rotatably connected to the second end of the corresponding first valve plate 6, and the second end of the second valve plate 7 is rotatably connected to the corresponding side plate 51. The first end of the second valve plate 7 and the second end of the first valve plate 6, as well as the second end of the second valve plate 7 and the corresponding side plate 51, are hinged.

[0038] The number of reset components 8 is equal to and corresponds one-to-one with the number of first valve plates 6. The reset components 8 are mounted on the side plate 51 and act on the first end of the first valve plate 6, providing a force that causes the first end of the first valve plate 6 to slide upwards. Under the force of the reset components 8, all the first valve plates 6 converge inwards to form a first guide cone with a sealed top and an open bottom. Similarly, all the second valve plates 7 converge inwards to form a second guide cone with a sealed bottom and an open top. The bottom of the first guide cone is connected to the smoke exhaust equipment, and the top of the second guide cone faces the interior of the common flue.

[0039] The sealing component 9 is disposed on the top of the valve seat frame 5. It is used to abut against the side wall of each second valve plate 7 located in the second guide cone to seal the gap between the second valve plate 7 and the side plate 51, so as to prevent oil fumes from passing through the gap between the second end of the second valve plate 7 and the hinge point of the corresponding side plate 51.

[0040] When a user's own exhaust system stops working, and a strong upward airflow (i.e., a "dragging effect") is generated in the public exhaust duct due to the use of powerful range hoods by residents on lower floors, the air pressure in the public exhaust duct is lower than the air pressure in the user's kitchen. At this time, the air pressure will give the second valve plate 7 an upward driving force, which in turn causes multiple second valve plates 7 to keep together retracting inward and combining to form a second guide cone with a sealed bottom and an open top. Multiple first valve plates 6 retract inward and combine to form a first guide cone with a closed top and an open bottom to maintain a sealed state.

[0041] When the user's exhaust equipment, such as a range hood, is working, the kitchen fumes are first discharged onto the first guide cone. At this time, the fumes come into contact with the first valve plate 6, and because the first valve plate 6 is inclined, the fumes converge at the top of the first guide cone. After convergence, the air pressure of the fumes increases, and this air pressure overcomes the negative pressure in the common flue, exerting a driving force on the second valve plate 7, causing the first valve plate 6 and the second valve plate 7 to rotate. This causes the first end of the first valve plate 6 to rotate with the guide assembly 10, and the guide assembly 10 moves downward relative to the side plate 51. At this time, the second valve plate 7 also rotates with the first valve plate 6, causing the second valve plate 7 to disengage from the sealing assembly 9, thereby connecting the first and second guide cones to form a smoke passage, allowing the fumes to be discharged into the common flue.

[0042] When the user's smoke exhaust equipment is not in use, the reset component 8 applies an upward force to the first valve plate 6 and uses the negative pressure in the common flue to apply a driving force to the second valve plate 7, thereby causing multiple first valve plates 6 to retract inward and combine to form a first guide cone with a closed top and an open bottom. All second valve plates 7 retract inward together to form a second guide cone with a sealed bottom and an open top, and the second valve plates 7 abut against the sealing component 9 to achieve a seal.

[0043] The reset assembly 8 may include at least one sleeve 81, at least one guide post 82, and at least one elastic element 83; the sleeve 81, guide post 82, and elastic element 83 are arranged in a one-to-one correspondence. One end of the guide post 82 is connected to the side plate 51, and the other end is slidably disposed inside the sleeve 81, which is connected to the slider 102. The elastic element 83 is a spring, which is sleeved on the guide post 82, with one end connected to the sleeve 81 and the other end connected to the side plate 51. In this embodiment, there are two sleeves 81, two guide posts 82, and two elastic elements 83, which are divided into two groups and symmetrically arranged on both sides of the guide post 101 to ensure the smooth operation of the first valve plate 6. When the fumes exert a downward force on the first valve plate 6, the first end of the first valve plate 6 moves downward, at which time the elastic element 83 is compressed. When no oil fumes apply a downward force to the first valve plate 6, the elastic force of the elastic element 83 causes the first end of the first valve plate 6 to move upward, so that multiple first valve plates 6 retract inward and combine to form a first guide cone with a closed top and an open bottom. All second valve plates 7 retract inward together and combine to form a second guide cone with a sealed bottom and an open top.

[0044] The second end of the first valve plate 6 includes a mounting portion 61 arranged parallel to the horizontal plane. A protrusion 62 is provided on the side wall of the mounting portion 61 facing the internal space of the first guide cone. The protrusion 62 and the first valve plate 6 can be integrally formed. The protrusion 62 includes a first guide surface 621 and a second guide surface 622 arranged opposite to each other. The angle formed by the first guide surface 621 and the side wall of the first valve plate 6 facing the internal space of the first guide cone is an acute angle. When all the first valve plates 6 are retracted inward, the second guide surfaces 622 of each protrusion 62 surround and form a third guide cone with a closed top and an open bottom.

[0045] like Figure 6 As shown, when the user's smoke exhaust equipment is in use, the fumes are first collected by the first guide cone. When they are collected at the third guide cone, the fumes are divided into two parts. One part enters the third guide cone and is collected again by the second guide surface 622 of the third guide cone to form a first airflow that breaks through the third guide cone. The other part enters the angle formed by the first guide surface 621 and the first valve plate 6 to form a second airflow that breaks through the first guide cone. In this way, the airflow generated by the fumes can break through the first guide cone and the second guide cone to form a smoke passage.

[0046] Each side plate 51 has an inclined first guide plate 11 at its bottom. All the first guide plates 11 together form a first truncated pyramid structure with openings at both the top and bottom, and the top opening area of ​​the first truncated pyramid structure is larger than the bottom opening area. This first truncated pyramid structure is used to collect oil fumes. Preferably, the top opening area of ​​the first truncated pyramid structure is less than or equal to the area of ​​the closed plane formed by the side walls of each mounting part 61 facing the internal space of the first guide cone when all the first valve plates 6 are retracted. More preferably, the top opening area of ​​the first truncated pyramid structure is less than or equal to the area of ​​the closed plane formed by the side walls of each mounting part 61 facing the internal space of the first guide cone when all the first valve plates 6 are retracted; and greater than the bottom opening area of ​​the third guide cone. This ensures that the oil fumes collected by the first truncated pyramid structure are divided into two parts, one part abutting against the first guide surface 621, and the other part entering the third guide cone, thereby ensuring that the oil fumes can break through the first guide cone.

[0047] The enclosed assembly 9 includes multiple second guide plates 91. Each side plate 51 has an inclined second guide plate 91 at its top. All the second guide plates 91 together form a second truncated pyramid structure with openings at both the top and bottom. The top opening area of ​​the second truncated pyramid structure is larger than the bottom opening area. The end of the second guide plate 91 away from the top of the side plate 51 abuts against the side wall of the second valve plate 7 located in the second guide cone body, which is correspondingly located on the same side plate 51. This serves to seal the gap between the second valve plate 7 and the side plate 51, and also to limit the rotation of the second valve plate 7. The bottom opening area of ​​the second truncated pyramid structure is greater than or equal to the top opening area of ​​the first truncated pyramid structure, thereby ensuring that the fumes can enter the common flue from the second truncated pyramid structure.

[0048] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A check valve mounting mechanism characterized by comprising: It includes a first fixing member (1), a first elastic seal (2), a second fixing member (3), and a second elastic seal (4); The first fixing member (1) is used to be mounted on the valve seat frame; the first fixing member (1) is provided with a square first receiving groove (111); The first elastic seal (2) is disposed in the first receiving groove (111); The second fixing member (3) is detachably connected to the first fixing member (1). The second fixing member (3) is provided with a through hole. The side wall of the through hole is bent towards the wall to form a square limiting part. The limiting part is used to be inserted into the first receiving groove (111), and the first elastic sealing member (2) is located between the first receiving groove (111) and the limiting part. The second elastic seal (4) is disposed on the side wall of the wall of the second fixing member (3) for abutting against the wall.

2. The back check valve mounting mechanism of claim 1, wherein: The first elastic seal (2) is provided with a second receiving groove (21) for the insertion of the limiting part.

3. The back check valve mounting mechanism of claim 1, wherein: The second fastener (3) is bolted to the first fastener (1).

4. A flue closure mechanism, characterised in that, include: The check valve mounting mechanism as described in any one of claims 1-3 further includes a plurality of first valve plates (6), a plurality of second valve plates (7), a plurality of reset components (8), and a sealing component (9); The valve seat frame (5) is a square channel formed by multiple interconnected side plates (51); The number of the first valve plates (6) is equal to the number of the side plates (51) of the valve seat frame (5) and they correspond one-to-one. The first end of each first valve plate (6) is rotatably connected to the corresponding side plate (51) and can slide on the side plate (51) in the vertical direction. The number of the second valve plates (7) is equal to that of the first valve plates (6) and they correspond one-to-one. The first end of the second valve plate (7) is rotatably connected to the second end of the corresponding first valve plate (6), and the second end of the second valve plate (7) is rotatably connected to the corresponding side plate (51). The number of reset components (8) is equal to and corresponds one-to-one with the number of the first valve plates (6). The reset components (8) are disposed on the side plate (51) and act on the first end of the first valve plate (6) to provide a force that causes the first end of the first valve plate (6) to slide upward. Under the force of the reset components (8), all the first valve plates (6) together retract inward and combine to form a first guide cone with a sealed top and an open bottom. All the second valve plates (7) together retract inward and combine to form a second guide cone with a sealed bottom and an open top. The bottom end of the first guide cone is connected to the smoke exhaust device, and the top end of the second guide cone faces the inside of the common flue. The sealing component (9) is disposed on the top of the valve seat frame (5) and is used to abut against the side wall of each of the second valve pieces (7) located in the second guide cone to seal the gap between the second valve piece (7) and the side plate (51).

5. The flue sealing mechanism according to claim 4, characterized in that: It also includes multiple guide components (10), the number of which is equal to and corresponds one-to-one with the number of the first valve plate (6); the guide components (10) are disposed on the side plate (51), and the first end of the first valve plate (6) is rotatably connected to the corresponding guide component (10).

6. The flue sealing mechanism according to claim 5, characterized in that: The guide assembly (10) includes a guide (101) and a slider (102). The guide (101) is disposed on the side plate (51). The slider (102) is slidably connected to the guide (101). The first end of the first valve plate (6) is rotatably connected to the slider (102).

7. The flue sealing mechanism according to claim 6, characterized in that: The reset assembly (8) includes at least one sleeve (81), at least one guide post (82), and at least one elastic element (83); the sleeve (81), the guide post (82), and the elastic element (83) are arranged in a one-to-one correspondence; One end of the guide post (82) is connected to the side plate (51), and the other end is slidably disposed in the sleeve (81). The sleeve (81) is connected to the slider (102). The elastic element (83) is sleeved on the guide post (82), with one end connected to the sleeve (81) and the other end connected to the side plate (51).

8. The flue sealing mechanism according to claim 4, characterized in that: The second end of the first valve plate (6) includes a mounting part (61) arranged parallel to the horizontal plane. The mounting part (61) is provided with a protrusion (62) on the side wall facing the inner space of the first guide cone. The protrusion (62) includes a first guide surface (621) and a second guide surface (622) arranged opposite to each other. The angle formed by the first guide surface (621) and the side wall facing the inner space of the first guide cone of the first valve plate (6) is an acute angle. When all the first valve plates (6) are retracted, the second guide surfaces (622) of each protrusion (62) surround and form a third guide cone with a closed top and an open bottom.

9. The flue sealing mechanism according to claim 8, characterized in that: Each of the side plates (51) is provided with an inclined first guide plate (11) at its bottom. All the first guide plates (11) are arranged to form a first truncated pyramid structure with openings at both the top and bottom. The opening area at the top of the first truncated pyramid structure is larger than the opening area at the bottom. The top opening area of ​​the first truncated pyramid structure is less than or equal to the area of ​​the closed plane formed by the side walls of each mounting part (61) facing the internal space of the first guide cone when all the first valve plates (6) are retracted; and greater than the bottom opening area of ​​the third guide cone.

10. The flue sealing mechanism according to claim 9, characterized in that: The enclosed assembly (9) includes a plurality of second guide plates (91); each of the side plates (51) has an inclined second guide plate (91) at its top, and all the second guide plates (91) together form a second frustum structure with openings at both the top and bottom ends, the top opening area of ​​the second frustum structure being larger than the bottom opening area; the end of the second guide plate (91) away from the top of the side plate (51) abuts against the side wall of the second valve plate (7) correspondingly disposed on the same side plate (51) located in the second guide cone; The bottom opening area of ​​the second frustum structure is greater than or equal to the top opening area of ​​the first frustum structure.

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