Flue gas baffle door and flue gas pipeline assembly

Abstract

The utility model relates to a flue gas baffle door and a flue gas pipeline assembly. The flue gas baffle door comprises a door frame, a door body, an annular sealing piece and a gas supply assembly. A smoke through-flow channel is defined by the inner circumferential wall of the door frame, a first annular groove extending in the circumferential direction of the door frame is formed in the inner circumferential wall of the door frame, the door body is located in the door frame, a second annular groove extending in the circumferential direction of the door body is formed in the outer circumferential wall of the door body, and the annular sealing piece is connected to the door body in a sealed mode and located at a groove opening of the second annular groove. The door body is rotatably connected to the door frame, the door body exposes the smoke through-flow channel at the opening position of the door body, the door body closes the smoke through-flow channel at the closing position of the door body, the end, away from the second annular groove, of the annular sealing piece is in sealed contact with the door frame, and the first annular groove and the second annular groove form a first cavity; the air supply assembly communicates with an air inlet formed in the door frame, the air supply assembly introduces air into the first cavity when the door body is located at the closing position, and the air pressure of the air is larger than that of smoke in the smoke through-flow channel.

Description

Technical Field

[0001] The present disclosure relates to a smoke exhaust system of a thermal power plant, and in particular to a smoke damper door and a smoke duct assembly. Background Art

[0002] The smoke damper door is a valve device installed in the smoke duct. When it is closed, it can cut off the smoke in the smoke duct and achieve sealing.

[0003] The smoke damper door in the related art is prone to seal failure due to wear of the sealing structure after long-term use, and then smoke leakage may occur when the smoke damper door is closed. Utility Model Content

[0004] The purpose of the present disclosure is to provide a smoke damper door and a smoke duct assembly to solve the technical problems in the related art.

[0005] In order to achieve the above-mentioned objectives, the present disclosure provides a smoke damper door in the first aspect, which includes a door frame, a door body, an annular seal and an air supply assembly; the inner peripheral wall of the door frame defines a smoke flow channel, the inner peripheral wall of the door frame is provided with a first annular groove extending along the circumference of the door frame, the door body is located inside the door frame, and the outer peripheral wall of the door body is provided with a second annular groove extending along the circumference of the door body, the annular seal is sealingly connected to the door body and is located at the notch of the second annular groove; the door body is rotatably connected to the door frame so as to be able to be in an open position and a closed position. The invention can switch between two positions, in the open position, the door body exposes the smoke flow channel, and in the closed position, the door body closes the smoke flow channel, and the end of the annular seal away from the second annular groove is in sealing contact with the door frame, and the first annular groove and the second annular groove constitute a first cavity; wherein, an air inlet connected to the first annular groove is formed on the door frame, and the air supply component is connected to the air inlet, and the air supply component is used to introduce gas into the first cavity when the door body is in the closed position, and the gas pressure of the gas is greater than the gas pressure of the smoke in the smoke flow channel.

[0006] Optionally, the inner circumferential wall of the door frame is provided with a first annular plate and a second annular plate relative to each other, and the first annular plate and the second annular plate together with the inner circumferential wall of the door frame define the first annular groove; the outer circumferential wall of the door body is provided with a third annular plate and a fourth annular plate relative to each other, and the third annular plate and the fourth annular plate together with the outer circumferential wall of the door body define the second annular groove; the sealing member includes a first annular elastic member and a second annular elastic member, one end of the first annular elastic member is sealingly connected to the third annular plate, and the other end of the first annular elastic member can be in sealing contact with the first annular plate, and one end of the second annular elastic member is sealingly connected to the fourth annular plate, and the other end of the second annular elastic member can be in sealing contact with the second annular plate.

[0007] Optionally, the first annular elastic member is located outside the second annular groove, and the second annular elastic member is located inside the second annular groove; the length of the first annular plate protruding from the door frame toward the door body is equal to the length of the fourth annular plate protruding from the door frame toward the door body, and the length of the second annular plate protruding from the door frame toward the door body is equal to the length of the third annular plate protruding from the door frame toward the door body.

[0008] Optionally, the air supply assembly includes an air supply valve and an air supply pipe, the air supply valve is installed on the door frame, one end of the air supply pipe is used to connect to the air source, the other end of the air supply pipe is connected to the inlet of the air supply valve, and the outlet of the air supply valve is connected to the air inlet.

[0009] Optionally, the smoke damper door also includes a driving motor and a transmission mechanism, the door body is connected to the door frame via a rotating shaft, the driving motor is installed on the door frame and connected to the rotating shaft, and the transmission mechanism is connected between the rotating shaft and the valve stem of the air supply valve so that the valve stem and the rotating shaft can rotate synchronously; in the open position, the air supply valve is in a cut-off state, and in the closed position, the air supply valve is in a conducting state.

[0010] Optionally, the axis of the valve stem is parallel to the axis of the rotating shaft, and the transmission mechanism is a connecting rod mechanism, which includes a first connecting rod, a second connecting rod and a third connecting rod, the first connecting rod extends radially along the rotating shaft and is fixed to the rotating shaft, the third connecting rod extends radially along the valve stem and is fixed to the valve stem, and both ends of the second connecting rod are respectively hinged to the adjacent first connecting rod and the third connecting rod.

[0011] Optionally, there are multiple door bodies, and the multiple door bodies are arranged side by side. The connecting rod mechanism also includes a fourth connecting rod. The first connecting rod is arranged on the rotating shaft of each door body, and the fourth connecting rod is hinged to the multiple first connecting rods.

[0012] Optionally, a support member is provided on the door frame, and the valve stem is rotatably inserted into the support member.

[0013] Optionally, there are multiple door bodies, and the multiple door bodies are arranged side by side. In the closed position, the second annular grooves between two adjacent door bodies are sealed and connected to form a second cavity, and the second cavity is connected to the first cavity.

[0014] In a second aspect, the present disclosure provides a smoke duct assembly, which includes a smoke duct and the above-mentioned smoke damper door, wherein the smoke duct includes a first duct and a second duct, and a door frame of the smoke damper door is connected between the first duct and the second duct.

[0015] Through the above technical solution, after the smoke damper door is applied to the smoke duct assembly, the smoke flow passage is connected to and communicated with the smoke duct. When the smoke damper door is opened, the door body is in an open position, and at this time, the smoke in the smoke exhaust duct located upstream of the smoke damper door can enter the smoke exhaust duct downstream of the smoke damper door through the smoke flow passage. When the smoke damper door is closed, the door body is in a closed position, and at this time, the door body blocks the smoke flow passage, and the smoke in the smoke exhaust duct located upstream of the smoke damper door cannot enter the smoke exhaust duct downstream of the smoke damper door through the smoke flow passage.

[0016] In the closed position of the door body, the annular seal is connected to the first annular groove and the second annular groove, so that the first annular groove and the second annular groove constitute a first cavity, and the first sealing connection between the door body and the door body is realized by the annular seal. In addition, when the door body is in the closed position, the high-pressure gas introduced into the first cavity by the air supply component through the air inlet is filled in the first cavity. Since the air pressure of the introduced gas is greater than the air pressure of the smoke in the smoke pipe, when the seal fails between the door body and the door frame, the high-pressure gas will flow from the seal failure position into the smoke pipe, so that the smoke cannot enter the first cavity from the seal failure position, and cannot reach the downstream of the smoke damper door through the smoke damper door from the upstream of the smoke damper door, thereby realizing the second sealing of the door frame and the door body through the gas introduced into the first cavity by the air supply component. The sealing performance of the smoke damper door is improved by the above double sealing.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0019] Figure 1is a front view of a smoke damper door provided by an exemplary embodiment of the present disclosure;

[0020] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure at AA in the middle (the air supply valve is not shown);

[0021] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure at BB in the middle (the air supply valve is not shown), wherein the door body shown by the dotted line is in an open position, and the door body shown by the solid line is in a closed position;

[0022] Figure 4 It is a schematic diagram of the connection structure between the drive motor and the transmission mechanism.

[0023] Description of Reference Numerals

[0024] 100 - door frame; 101 - air inlet; 110 - first annular groove; 111 - first annular plate; 112 - second annular plate; 120 - support member;

[0025] 200-door body; 201-rotating shaft; 210-second annular groove; 211-third annular plate; 212-fourth annular plate; 220-first cavity; 230-second cavity;

[0026] 300-air supply assembly; 310-air supply valve; 311-valve stem; 320-air supply pipe;

[0027] 400-connecting rod mechanism; 410-first connecting rod; 420-second connecting rod; 430-third connecting rod; 440-fourth connecting rod;

[0028] 500-driving motor;

[0029] 600 - annular sealing member; 610 - a first annular elastic member; 620 - a second annular elastic member. DETAILED DESCRIPTION

[0030] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0031] In the description of the present disclosure, it is to be understood that the terms "inside" and "outside" refer to the inside and outside of the corresponding structural contour. In addition, the terms "first", "second", etc. are only used to distinguish one element from another element, and have no order or importance.

[0032] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0033] The present disclosure provides a smoke damper door in one aspect to solve the defect that the existing smoke damper door is prone to sealing failure.

[0034] like Figures 1 to 4 As shown, the smoke damper door provided by the present disclosure includes a door frame 100, a door body 200, an annular seal 600 and an air supply assembly 300; the inner peripheral wall of the door frame 100 defines a smoke flow channel, and the inner peripheral wall of the door frame 100 is provided with a first annular groove 110 extending along the circumference of the door frame 100, the door body 200 is located inside the door frame 100, and the outer peripheral wall of the door body 200 is provided with a second annular groove 210 extending along the circumference of the door body 200, and the annular seal 600 is sealingly connected to the door body 200 and is located at the notch of the second annular groove 210; the door body 200 is rotatably connected to the door frame 100 so as to be able to be in an open position and a closed position. The door body 200 switches between two closed positions. In the open position, the door body 200 exposes the smoke flow passage. In the closed position, the door body 200 blocks the smoke flow passage. The end of the annular seal 600 away from the second annular groove 210 is in sealing contact with the door frame 100. The first annular groove 110 and the second annular groove 210 constitute a first cavity 220. An air inlet 101 connected to the first annular groove 110 is formed on the door frame 100. The air supply component 300 is connected to the air inlet 101. The air supply component 300 is used to introduce gas into the first cavity 220 when the door body 200 is in the closed position. The gas pressure is greater than the gas pressure of the smoke in the smoke flow passage.

[0035] Through the above solution, after the smoke damper door is applied to the smoke duct assembly, the smoke flow passage is connected to and communicated with the smoke duct. When the smoke damper door is opened, the door body 200 is in an open position, and the smoke in the smoke exhaust duct upstream of the smoke damper door can enter the smoke exhaust duct downstream of the smoke damper door through the smoke flow passage. When the smoke damper door is closed, the door body 200 is in a closed position, and the door body 200 blocks the smoke flow passage, and the smoke in the smoke exhaust duct upstream of the smoke damper door cannot enter the smoke exhaust duct downstream of the smoke damper door through the smoke flow passage.

[0036] In the closed position of the door body 200 , the annular seal 600 is connected to the first annular groove 110 and the second annular groove 210 , so that the first annular groove 110 and the second annular groove 210 form a first cavity 220 , and the first sealing connection between the door bodies 200 and 200 is achieved through the annular seal 600 . Furthermore, when the door body 200 is in the closed position, the high-pressure gas introduced into the first cavity 220 by the air supply assembly 300 through the air inlet 101 is filled in the first cavity 220. Since the air pressure of the introduced gas is greater than the air pressure of the smoke in the smoke duct, when the seal fails between the door body 200 and the door frame 100, the high-pressure gas will flow into the smoke duct from the seal failure position, so that the smoke cannot enter the first cavity 220 from the seal failure position, nor can it pass through the smoke damper door from the upstream of the smoke damper door to the downstream of the smoke damper door, and then the gas introduced into the first cavity 220 by the air supply assembly 300 realizes the second sealing of the door frame 100 and the door body 200. The sealing performance of the smoke damper door is improved by the above double sealing.

[0037] It should be noted that when the door body 200 is in the open position, the air supply assembly 300 can stop ventilating the air inlet 101 to reduce gas waste. In addition, the door body 200 can be switched between the open position and the closed position manually or electrically, and this disclosure does not make specific limitations on this.

[0038] like Figures 1 to 3 As shown, in some optional embodiments, the inner circumferential wall of the door frame 100 is provided with a first annular plate 111 and a second annular plate 112 relative to each other, and the first annular plate 111 and the second annular plate 112 and the inner circumferential wall of the door frame 100 jointly define a first annular groove 110; the outer circumferential wall of the baffle plate is provided with a third annular plate 211 and a fourth annular plate 212 relative to each other, and the third annular plate 211 and the fourth annular plate 212 and the outer circumferential wall of the baffle plate jointly define a second annular groove 210; the sealing member includes a first annular elastic member 610 and a second annular elastic member 620, one end of the first annular elastic member 610 is sealingly connected to the third annular plate 211, and the other end of the first annular elastic member 610 can be in sealing contact with the first annular plate 111, one end of the second annular elastic member 620 is sealingly connected to the fourth annular plate 212, and the other end of the second annular elastic member 620 can be in sealing contact with the second annular plate 112.

[0039] The annular seal 600 is configured to include a first annular elastic member 610 and a second annular elastic member 620. When the door body 200 is in a closed position, the first annular elastic member 610 can achieve sealing between the first annular plate 111 and the third annular plate 211, and the second annular elastic member 620 can achieve sealing between the second annular plate 112 and the fourth annular plate 212, so that the first annular elastic member 610 and the second annular elastic member 620 can not only seal the first cavity 220, but also have a double sealing effect between the door frame 100 and the door body 200, thereby improving the sealing performance between the door body 200 and the door frame 100.

[0040] like Figure 2 As shown, in some optional embodiments, the first annular elastic member 610 is located outside the second annular groove 210, and the second annular elastic member 620 is located inside the second annular groove 210; the length of the first annular plate 111 protruding from the door frame 100 toward the door body 200 is equal to the length of the fourth annular plate 212 protruding from the door body 200 toward the door frame 100, and the length of the second annular plate 112 protruding from the door frame 100 toward the door body 200 is equal to the length of the third annular plate 211 protruding from the door body 200 toward the door frame 100.

[0041] The first annular elastic member 610 is arranged outside the second annular groove 210, and the second annular elastic member 620 is arranged inside the second annular groove 210, so that the installation direction of the first annular elastic member 610 on the third annular plate 211 is the same as the installation direction of the second annular elastic member 620 on the fourth annular plate 212, so that when the door body 200 switches between the open position and the closed position, the first annular elastic member 610 and the second annular elastic member 620 will not interfere with the door body 200. The length of the first annular plate 111 protruding from the door frame 100 toward the door body 200 is equal to the length of the fourth annular plate 212 protruding from the door body 200 toward the door frame 100, and the length of the second annular plate 112 protruding from the door frame 100 toward the door body 200 is equal to the length of the third annular plate 211 protruding from the door frame 100 toward the door body 200, so that when the first annular elastic member 610 contacts and seals with the first annular groove 110, the second annular elastic member 620 can also contact and seal with the first annular groove 110.

[0042] like Figure 2 and Figure 3As shown, in some optional embodiments, the length of the first annular plate 111 is not equal to the length of the second annular plate 112, and the length of the first annular plate 111 is equal to the length of the fourth annular plate 212, and the length of the second annular plate 112 is equal to the length of the third annular plate 211. This arrangement can prevent any one of the first annular plate 111 and the second annular plate 112 from having a rigid collision with any one of the third annular plate 211 and the fourth annular plate 212 during the rotation of the door body 200.

[0043] like Figure 1 As shown, for the specific structure of the air supply component 300, in some optional embodiments, the air supply component 300 includes an air supply valve 310 and an air supply pipe 320, the air supply valve 310 is installed on the door frame 100, one end of the air supply pipe 320 is used to connect to the air source, the other end of the air supply pipe 320 is connected to the inlet of the air supply valve 310, and the outlet of the air supply valve 310 is connected to the air inlet 101.

[0044] The air supply valve 310 in the air supply assembly 300 can be controlled to switch between the cut-off state and the on state by rotating the valve stem 311 of the air supply valve 310. When the air supply valve 310 is in the on state, the air supply pipe 320 is connected with the air inlet 101 on the door frame 100 to supply gas to the first cavity 220; when the air supply valve 310 is in the cut-off state, the air supply pipe 320 is disconnected from the air inlet 101, and the supply of gas to the first cavity 220 is stopped.

[0045] It should be noted that the gas source here can be an air compressor or a high-pressure gas pipe in a factory. In some optional embodiments, the air supply valve 310 may not be provided, and an air compressor may be directly provided, and the air outlet of the air compressor may be connected to the air inlet 101 of the door frame 100, and whether to supply gas to the first cavity 220 may be controlled by controlling the start / stop of the air compressor.

[0046] like Figure 1 and Figure 4 As shown, in some optional embodiments, the smoke damper door also includes a drive motor 500 and a transmission mechanism, the door body 200 is connected to the door frame 100 via a rotating shaft 201, the drive motor 500 is installed on the door frame 100 and connected to the rotating shaft 201, and the transmission mechanism is connected between the rotating shaft 201 and the valve stem 311 of the air supply valve 310 so that the valve stem 311 and the rotating shaft 201 can rotate synchronously; in the open position, the air supply valve 310 is in a cut-off state, and in the closed position, the air supply valve 310 is in a conducting state.

[0047] By providing the driving motor 500 and the transmission mechanism, the driving motor 500 can simultaneously control the actions of the door body 200 and the air supply valve 310 through the transmission mechanism. When the door body 200 is switched to the closed position, the air supply valve 310 is synchronously switched to the on state, and gas can be quickly introduced into the first cavity 220 to ensure the sealing performance between the door body 200 and the door frame 100. When the door body 200 is switched to the open position, the air supply valve 310 is synchronously switched to the off state, and the gas is stopped from being introduced into the first cavity 220, thereby reducing the waste of gas.

[0048] like Figure 1 and Figure 4 As shown, for the specific structure of the transmission mechanism, in some optional embodiments, the axis of the valve stem 311 is parallel to the axis of the rotating shaft 201, and the transmission mechanism is a connecting rod mechanism 400, which includes a first connecting rod 410, a second connecting rod 420 and a third connecting rod 430. The first connecting rod 410 extends along the radial direction of the rotating shaft 201 and is fixed to the rotating shaft 201, the third connecting rod 430 extends along the radial direction of the valve stem 311 and is fixed to the valve stem 311, and the two ends of the second connecting rod 420 are respectively hinged to the adjacent first connecting rod 410 and the third connecting rod 430. When the driving motor 500 drives the rotating shaft 201 to rotate, the first connecting rod 410 swings. Since the axis of the valve stem 311 is parallel to the axis of the rotating shaft 201, when the first connecting rod 410 swings, the third connecting rod 430 can be driven to swing around the valve stem 311 through the second connecting rod 420 to drive the valve stem 311 to rotate. The synchronous rotation of the rotating shaft 201 and the valve stem 311 is achieved.

[0049] In some optional embodiments, there are multiple door bodies 200, and the multiple door bodies 200 are arranged side by side. The link mechanism 400 also includes a fourth link 440. The first link 410 is arranged on the rotating shaft 201 of each door body 200, and the fourth link 440 is hinged to the multiple first links 410. The synchronous rotation between the multiple rotating shafts 201 is achieved through the fourth link 440, and the rotation directions of the multiple rotating shafts 201 can be consistent, thereby achieving the simultaneous switching of the multiple door bodies 200 to the open position or the simultaneous switching to the closed position.

[0050] In some optional implementations, a support member 120 is provided on the door frame 100 , and the valve stem 311 is rotatably disposed through the support member 120 .

[0051] By providing the support member 120 , the valve stem 311 can be supported, so that the valve stem 311 of the air supply valve 310 can be designed to be longer without shaking, thereby providing more options for the installation position of the air supply valve 310 .

[0052] like Figure 1 and Figure 3As shown, in some optional embodiments, there are multiple door bodies 200, and the multiple door bodies 200 are arranged side by side. In the closed position, the second annular grooves 210 between two adjacent door bodies 200 are sealed and connected to form a second cavity 230, and the second cavity 230 is connected to the first cavity 220. After the gas is introduced into the first cavity 220 connected to the air inlet 101, the gas will also enter the second cavity 230 and the first cavity 220 formed between other door bodies 200 and the door frame 100, so as to achieve the effect of sealing between the two adjacent door bodies 200.

[0053] Based on the above-mentioned damper door, the present disclosure provides a flue pipe assembly in another aspect, the flue pipe assembly includes a flue pipe and the above-mentioned flue damper door, the flue pipe includes a first pipe and a second pipe, and the door frame 100 of the flue damper door is connected between the first pipe and the second pipe. Among them, one of the first pipe and the second pipe is connected to one side of the door frame 100 to form an upstream pipe of the flue damper door, and the other is connected to the other side of the door frame 100 to form a downstream pipe of the flue damper door. When the damper door is closed, the flow of smoke between the first pipe and the second pipe can be disconnected. When the damper door is opened, the first pipe and the second pipe can be connected, so that smoke can flow between the first pipe and the second pipe.

[0054] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations. In addition, the various different embodiments of the present disclosure can also be combined arbitrarily, as long as they do not violate the ideas of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A smoke damper door, characterized in that: It includes a door frame, a door body, an annular seal and an air supply assembly; The inner peripheral wall of the door frame defines a smoke flow channel, the inner peripheral wall of the door frame is provided with a first annular groove extending along the circumference of the door frame, the door body is located inside the door frame, the outer peripheral wall of the door body is provided with a second annular groove extending along the circumference of the door body, and the annular seal is sealingly connected to the door body and is located at the notch of the second annular groove; The door body is rotatably connected to the door frame so as to be switchable between an open position and a closed position. In the open position, the door body exposes the smoke flow passage. In the closed position, the door body seals the smoke flow passage. One end of the annular seal away from the second annular groove is in sealing contact with the door frame. The first annular groove and the second annular groove form a first cavity. Among them, an air inlet connected to the first annular groove is formed on the door frame, and the air supply component is connected to the air inlet. The air supply component is used to introduce gas into the first cavity when the door body is in the closed position, and the gas pressure of the gas is greater than the gas pressure of the smoke in the smoke flow channel.

2. The smoke damper door according to claim 1, characterized in that: The inner peripheral wall of the door frame is provided with a first annular plate and a second annular plate opposite to each other, and the first annular plate and the second annular plate together with the inner peripheral wall of the door frame define the first annular groove; The outer peripheral wall of the door body is provided with a third annular plate and a fourth annular plate opposite to each other, and the third annular plate and the fourth annular plate together with the outer peripheral wall of the door body define the second annular groove; The sealing member includes a first annular elastic member and a second annular elastic member, one end of the first annular elastic member is sealingly connected to the third annular plate, and the other end of the first annular elastic member can be in sealing contact with the first annular plate, one end of the second annular elastic member is sealingly connected to the fourth annular plate, and the other end of the second annular elastic member can be in sealing contact with the second annular plate.

3. The smoke damper door according to claim 2, characterized in that: The first annular elastic member is located outside the second annular groove, and the second annular elastic member is located inside the second annular groove; The length of the first annular plate protruding from the door frame toward the door body is equal to the length of the fourth annular plate protruding from the door frame toward the door body, and the length of the second annular plate protruding from the door frame toward the door body is equal to the length of the third annular plate protruding from the door frame toward the door body.

4. The smoke damper door according to any one of claims 1 to 3, characterized in that: The air supply assembly includes an air supply valve and an air supply pipe. The air supply valve is installed on the door frame. One end of the air supply pipe is used to connect to the air source, the other end of the air supply pipe is connected to the inlet of the air supply valve, and the outlet of the air supply valve is connected to the air inlet.

5. The smoke damper door according to claim 4, characterized in that: The smoke damper door further comprises a driving motor and a transmission mechanism, the door body is connected to the door frame via a rotating shaft, the driving motor is mounted on the door frame and connected to the rotating shaft, and the transmission mechanism is connected between the rotating shaft and the valve stem of the air supply valve so that the valve stem and the rotating shaft can rotate synchronously; In the open position, the air supply valve is in a cut-off state, and in the closed position, the air supply valve is in a conducting state.

6. The smoke damper door according to claim 5, characterized in that: The axis of the valve stem is parallel to the axis of the rotating shaft. The transmission mechanism is a connecting rod mechanism, which includes a first connecting rod, a second connecting rod and a third connecting rod. The first connecting rod extends radially along the rotating shaft and is fixed to the rotating shaft. The third connecting rod extends radially along the valve stem and is fixed to the valve stem. Both ends of the second connecting rod are respectively hinged to the adjacent first connecting rod and the third connecting rod.

7. The smoke damper door according to claim 6, characterized in that: There are multiple door bodies, which are arranged side by side. The connecting rod mechanism also includes a fourth connecting rod. The first connecting rod is arranged on the rotating shaft of each door body, and the fourth connecting rod is hinged to the multiple first connecting rods.

8. The smoke damper door according to claim 5, characterized in that: A support member is provided on the door frame, and the valve stem is rotatably inserted through the support member.

9. The smoke damper door according to any one of claims 1 to 3, characterized in that: There are multiple door bodies, which are arranged side by side. In the closed position, the second annular grooves between two adjacent door bodies are sealed and connected to form a second cavity, and the second cavity is connected to the first cavity.

10. A flue gas duct assembly, characterized in that: The invention comprises a smoke duct and a smoke damper door according to any one of claims 1 to 9, wherein the smoke duct comprises a first duct and a second duct, and a door frame of the smoke damper door is connected between the first duct and the second duct.

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