Flue baffle valve

Abstract

The invention belongs to the technical field of flue gas baffles and discloses a flue baffle valve which comprises a large valve set, a motor assembly and a follow-up assembly, the large valve set comprises a large valve body and a large valve plate, the large valve plate integrally falls into the large valve body, and the motor assembly and the follow-up assembly are arranged at the two ends of the axis of the large valve body respectively and fixedly connected with the large valve body and the large valve plate. The motor assembly drives the large valve plate to turn over along the axis, the follow-up assembly rotates along with the motor assembly, opening and closing of the large valve set are achieved, a sealing air channel T is formed between the inner side of the large valve body and the outer side of the large valve plate, and a cavity formed by the motor assembly and the follow-up assembly and the connecting portion of the large valve body and the large valve plate is communicated with the sealing air channel T; sealing air can pass through the cavity to form an air seal of the connecting part of the motor assembly and the follow-up assembly with the large valve body and the large valve plate. The connecting parts of the motor assembly and the follow-up assembly with the large valve body and the large valve plate are improved, absolute sealing of the position of the rotating shaft is guaranteed, and the sealing performance is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of smoke dampers, and in particular relates to a smoke duct damper valve. Background Art

[0002] Flue gas desulfurization (FGD) is the only desulfurization method currently used in large-scale commercial applications in the world, and is the main technical means for thermal power plants to control acid rain and sulfur dioxide pollution. Flue gas dampers are important equipment for entering and exiting operation in desulfurization devices, including FGD main flue flue dampers and bypass flue gas dampers. The former is used to ensure the normal operation of the FGD system, and the latter is quickly opened when the FGD system fails to ensure the normal operation of the boiler. Commonly used are single-axis double louver damper valves, which mainly include large valve group, small valve group, double rocker mechanism and motor assembly. The large valve group mainly includes large valve body, large valve plate, motor assembly, etc. The large valve plate is installed on the large valve body, and the motor assembly is installed on both sides of the large valve body. It is fixedly connected to the axis of the large valve plate through the valve seat shaft, and the large valve plate is driven to open and close by rotation. The small valve group is fixedly installed on the large valve body, connected to the inner cavity of the large valve body, and connected to the motor assembly through the double rocker mechanism to achieve linkage. When the large valve group for flue gas is closed, the small valve group for sealing air is opened; when the large valve group is opened, the small valve group is closed. The large valve group is used to open and close to pass and block flue gas, and the small valve group is used to introduce sealing air. When the large valve group is closed, the internal pressure of the large valve group is increased to achieve air sealing and prevent the large valve body from entering the closed connection due to poor sealing.

[0003] The existing single-axis double-louver circular baffle valve has the following problems: the sealing air of the traditional flue baffle valve can only pass through the channel between the inner side of the large valve body and the large valve plate, and the connection gap between the motor assembly and the large valve body and the large valve plate cannot be air-tight, and the smoke leakage rate is difficult to achieve, especially at the matching junction of the large valve plate and the valve seat shaft position. To achieve the seal between the motor assembly and the large valve body and the large valve plate, either welding is used to fix it, which is not convenient for disassembly and maintenance, increasing the maintenance cost. It is also difficult to ensure the coaxiality between the large valve plate and the valve seat; the structural design of the sealing air valve body has over-positioning. Summary of the invention

[0004] The object of the present invention is to provide a flue damper valve to solve the above-mentioned technical problems.

[0005] In order to solve the above technical problems, a specific technical solution of a flue damper valve of the present invention is as follows: A flue damper valve comprises a large valve group, a motor assembly and a follower assembly, wherein the large valve group comprises a large valve body and a large valve plate, wherein the large valve plate falls into the large valve body as a whole, wherein the motor assembly and the follower assembly are respectively arranged at two ends of the axis of the large valve body and are fixedly connected to the large valve body and the large valve plate, wherein the motor assembly drives the large valve plate to flip along the axis, and the follower assembly rotates accordingly to realize the opening and closing of the large valve group, wherein a sealed air channel T is formed between the inner side of the large valve body and the outer side of the large valve plate, and a cavity formed at the connection part between the motor assembly and the follower assembly and the large valve body and the large valve plate is communicated with the sealed air channel T, and the sealed air can form an air seal at the connection part between the motor assembly and the follower assembly and the large valve body and the large valve plate through the cavity.

[0006] Furthermore, the large valve body has connecting holes at both ends of the axis, and a connecting flange is provided on the outside of the connecting hole. The large valve plate is disc-shaped and has rotating shaft connecting parts at both ends of the axis. The rotating shaft connecting part of the large valve plate is aligned with the connecting hole of the large valve body, and the motor assembly and the follower assembly are respectively fixedly connected to the two ends of the large valve body through the connecting flange of the large valve body, and are fixedly connected to the large valve plate through the rotating shaft connecting part of the large valve plate.

[0007] Furthermore, the motor assembly includes a motor seat and a driving shaft, and the driving shaft is coaxially arranged in the motor seat; the follower assembly includes a follower seat and a driven shaft, and the driven shaft is coaxially arranged in the follower seat. The rotating shaft connecting part of the large valve plate includes a rotating shaft connecting seat and a connecting ring, and the connecting ring is coaxially arranged on the outer periphery of the rotating shaft connecting seat, and there is a gap between the rotating shaft connecting seat, and the driving shaft and the driven shaft are respectively fixedly mounted on the rotating shaft connecting parts on both sides of the large valve plate, and the ends of the motor seat and the follower seat have connecting grooves, and a connecting flange 2 is provided in the middle, and the connecting flange 2 is fixedly connected to the connecting flange 1 of the large valve body, and the connecting groove is used for nesting connection with the connecting ring, and the connection is a stopper 1, and the outer wall of the motor seat and the follower seat is tightly connected to the inner wall of the connecting hole of the large valve body, and the connection is a stopper 2.

[0008] Furthermore, the connecting ring of the large valve plate has rectangular grooves on both sides, so that the cavity formed between the inner wall of the motor seat or the follower seat and the inner wall of the connecting ring and the outer wall of the driving shaft or the driven shaft and the rotating shaft connecting seat is connected to the sealing air channel T, and the sealing air can pass into the cavity to perform air sealing on the stopper.

[0009] Furthermore, circular holes evenly distributed around the circumference are provided at the second stoppers on the outer walls of the motor seat and the follower seat for blocking and sealing the flue wind at the second stoppers through sealing wind. The motor seat, the follower seat and the shaft connection are machined, and the fitting clearance between the first stopper and the second stopper is obtained by machine tool processing, and the clearance size is controlled within 0.05-0.1mm.

[0010] Furthermore, the small valve group is installed on the large valve body and is connected to the sealing air channel, and the small valve group is used to introduce the sealing air.

[0011] Furthermore, the large valve group also includes an elastic sheet and a pressure plate, the pressure plate is fixedly mounted on the upper and lower ends of the inner side of the circumference of the large valve body, and the upper and lower ends of the edge of the large valve plate are sealed with the pressure plate through elastic sheets; the pressure plate includes an upper pressure plate and a lower pressure plate, the elastic sheet includes an upper spring sheet and a lower spring sheet, one end of the upper spring sheet is fixedly connected to the upper edge of the large valve plate, and the other end is a free end, which can be fitted with the upper pressure plate when closed, one end of the lower spring sheet is fixedly connected to the edge of the lower pressure plate, and the other end is a free end, which can be fitted with the lower edge of the large valve plate when closed, and the free end of the elastic sheet is bent inward to form two inclined surfaces.

[0012] Furthermore, it includes a double rocker mechanism, the small valve group is connected to the motor assembly through the double rocker mechanism, and is linked with the large valve group. When the large valve group is closed, the small valve group is opened; when the large valve group is opened, the small valve group is closed.

[0013] Furthermore, bolt holes are provided on the upper and lower sides of the plate surface of the large valve plate, and the bolt holes are used to screw in lifting eye bolts, so as to facilitate lifting out the large valve plate when disassembling it.

[0014] Furthermore, the small valve group includes a small valve body, a small valve plate, a small valve stem and a square tube. The small valve body is fixedly mounted on the large valve body, the square tube is fixedly mounted on one side of the small valve body, and round tubes are provided at both ends of the axis of the small valve body. The small valve stem passes through the round tubes at both ends of the small valve body and the square tube. The small valve stem is fixed to the side wall of the small valve body and the end of the square tube through square bearing seats respectively. The small valve plate is fixed on the small valve stem, and rotates with the small valve stem to realize the opening and closing of the small valve body.

[0015] A flue damper valve of the present invention has the following advantages: the present invention improves the connection part between the motor assembly and the follower assembly and the large valve body and the large valve plate, so that the cavity formed by the connection part between the motor assembly and the follower assembly and the large valve body and the large valve plate is communicated with the sealed air channel, and the sealed air can form an air seal at the connection part between the motor assembly and the follower assembly and the large valve body and the large valve plate through the cavity. At the same time, the motor seat 41, the follower seat 51 and the rotating shaft connecting part 121 are machined to ensure the coaxiality of the connection of each component, and the matching clearance at the stopper 1 and the stopper 2 is obtained by machine processing, and the clearance size can be controlled, which theoretically ensures the absolute sealing of the rotating shaft position. The present invention also improves the structure of the elastic sheet, so that the elastic sheet is not easily deformed, and the sealing performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the flue damper valve of the present invention; Figure 2It is a schematic diagram of the structure of the large valve body of the present invention; Figure 3 It is a schematic diagram of the structure of the large valve plate of the present invention; Figure 4 A top view of the flue damper valve of the present invention; Figure 5 for Figure 4 BB cross-sectional view; Figure 5a for Figure 5 A partial enlarged view of Figure 6 for Figure 4 AA section view; Figure 6a for Figure 6 A partial enlarged view of Figure 7 It is a schematic diagram of the structure of the motor assembly of the present invention; Figure 8 It is a schematic diagram of the structure of the follower assembly of the present invention; Fig. 9 It is a schematic diagram of the structure of the small valve group of the present invention; Fig.10 It is a cross-sectional view of the small valve group of the present invention; Markings in the figure: 1. Large valve group; 11. Large valve body; 111. Connecting hole; 112. Connecting flange 1; 12. Large valve plate; 121. Rotating shaft connecting part; 1211. Rotating shaft connecting seat; 1212. Connecting ring; 12121. Rectangular groove; 122. Bolt hole; 123. Eye bolt; 13. Elastic sheet; 131. Upper spring sheet; 132. Lower spring sheet; 133. Inclined surface; 14. Pressing plate; 141. Upper pressing plate; 142. Lower pressing plate; 2. Small valve group; 2 1. Small valve body; 211. Round tube; 22. Small valve plate; 23. Small valve stem; 24. Square tube; 25. Square bearing seat; 26. O-ring; 3. Double rocker mechanism; 31. Large swing arm; 32. Small swing arm; 33. Connecting rod; 4. Motor assembly; 41. Motor seat; 411. Connecting notch; 412. Round hole; 413. Connecting flange 2; 42. Driving shaft; 5. Follower assembly; 51. Follower seat; 52. Driven shaft; SA1. Stopper 1; SA2. Stopper 2. DETAILED DESCRIPTION

[0017] In order to better understand the purpose, structure and function of the present invention, a flue damper valve of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a flue damper valve of the present invention comprises a large valve group 1, a small valve group 2, a double rocker mechanism 3, a motor assembly 4 and a follower assembly 5. The large valve group 1 comprises a large valve body 11, a large valve plate 12, an elastic sheet 13 and a pressure plate 14. Figure 2 As shown, the large valve body 11 is annular, with connecting holes 111 at both ends of the axis, and a connecting flange 112 outside the connecting hole 111. Figure 3 As shown, the large valve plate 12 is disc-shaped, with a rotating shaft connection part 121 at both ends of the axis. The large valve plate 12 falls into the large valve body 11 as a whole, and the rotating shaft connection part 121 is aligned with the connecting hole 111 of the large valve body 11. The motor assembly 4 and the follower assembly 5 are respectively fixedly connected to the two ends of the large valve body 11 through the connecting flange 112 of the large valve body 11, and are fixedly connected to the large valve plate 12 through the rotating shaft connection part 121 of the large valve plate 12. The motor assembly 4 drives the large valve plate 12 to flip along the axis, and the follower assembly 5 rotates accordingly to realize the opening and closing of the large valve group 1.

[0019] The pressing plate 14 is fixedly mounted on the upper and lower ends of the inner circumference of the large valve body 11. The upper and lower ends of the edge of the large valve plate 12 are sealed and connected to the pressing plate 14 through the elastic sheet 13.

[0020] like Figure 4 , Figure 5 As shown, a sealed air passage T is formed between the inner side of the large valve body 11 and the outer side of the large valve plate 12. The small valve group 2 is installed on the large valve body 11 and communicates with the sealed air passage. The small valve group 2 is connected to the motor assembly 4 through the double rocker mechanism 3 and realizes linkage with the large valve group 1. When the large valve group 1 is closed, the small valve group 2 is opened; when the large valve group 1 is opened, the small valve group 2 is closed. The small valve group 2 is used to introduce sealed air, increase the internal pressure of the large valve group 1 when the large valve group 1 is closed, realize air sealing, and prevent smoke from entering the connection between the components after the large valve group 1 is closed.

[0021] The cavity formed at the connection between the motor assembly 4 and the follower assembly 5 and the large valve body 11 and the large valve plate 12 of the present invention is connected to the sealed air channel T, and the sealed air can form an air seal at the connection between the motor assembly 4 and the follower assembly 5 and the large valve body 11 and the large valve plate 12 through the cavity.

[0022] Specifically, Figure 7 As shown, the motor assembly 4 mainly includes a motor base 41 and a driving shaft 42, and the driving shaft 42 is coaxially arranged in the motor base 41. Figure 8 As shown, the follower assembly 5 mainly includes a follower seat 51 and a driven shaft 52, and the driven shaft 52 is coaxially arranged in the follower seat 51. Figure 3As shown, the shaft connection part 121 of the large valve plate 12 includes a shaft connection seat 1211 and a connection ring 1212. The connection ring 1212 is coaxially arranged on the outer periphery of the shaft connection seat 1211, and there is a gap between the connection ring 1212 and the shaft connection seat 1211. The driving shaft 42 and the driven shaft 52 are respectively fixedly mounted on the shaft connection parts 121 on both sides of the large valve plate 12 by bolts. The motor seat 41 and the follower seat 51 have connection notches 411 at the ends, and have a second connection flange 413 in the middle. The second connection flange 413 is fixedly connected to the first connection flange 112 of the large valve body 11. The connection notch 411 is used for nesting connection with the connection ring 1212. The connection is a stopper SA1. The outer wall of the motor seat 41 and the follower seat 51 is tightly connected to the inner wall of the connection hole 111 of the large valve body 11. The connection is a stopper SA2.

[0023] In order to solve the sealing problem between the motor assembly 4 and the follower assembly 5 and the connecting ring 1212 of the large valve plate 12 (stop SA1), as shown in FIG. Figure 3 As shown, the present invention opens rectangular grooves 12121 on both sides of the connecting ring 1212 of the large valve plate 12, so that the cavity formed between the inner wall of the motor seat 41 (or the follower seat 51) and the inner wall of the connecting ring 1212 and the driving shaft 42 (or the driven shaft 52) ​​and the outer wall of the rotating shaft connecting seat 1211 can be connected to the sealing air channel, and the sealing air of the small valve group 2 can pass into the cavity to perform air sealing on the stop SA1 to prevent smoke from entering.

[0024] At the same time, in order to solve the problem of sealing between the motor assembly 4 and the follower assembly 5 and the connecting hole 111 of the large valve group 1 (stop 2 SA2), as shown in FIG. Figure 6 , Figure 6a , Figure 7 , Figure 8 As shown, the present invention opens circular holes 412 evenly distributed around the circumference at the stopper second SA2 on the outer wall of the motor seat 41 and the follower seat 51, so as to block and seal the flue wind at the stopper second SA2 through sealing wind. Meanwhile, the motor seat 41, the follower seat 51 and the rotating shaft connecting part 121 are machined to ensure the coaxiality of the connection of each component. The matching clearance at the stopper first SA1 and the stopper second SA2 is obtained by machine processing, and the clearance size can be controlled within 0.05-0.1mm, thereby theoretically ensuring absolute sealing.

[0025] like Figure 5aAs shown, the pressure plate 14 includes an upper pressure plate 141 and a lower pressure plate 142, and the elastic sheet 13 includes an upper elastic sheet 131 and a lower elastic sheet 132. One end of the upper elastic sheet 131 is fixedly connected to the upper edge of the large valve plate 12, and the other end is a free end, which can fit with the upper pressure plate 141 when closed. One end of the lower elastic sheet 132 is fixedly connected to the edge of the lower pressure plate 142, and the other end is a free end, which can fit with the lower edge of the large valve plate 12 when closed. In order to further improve the sealing performance, the present invention improves the elastic sheet 13. The free end of the elastic sheet 13 is bent inwardly to form two inclined surfaces 133, and the bending angle is 60-120 degrees. Compared with the elastic sheet in a flat shape, the bent elastic sheet 13 has an inclined surface. When the sealing wind acts on the inclined surface 133, the elastic sheet is not easily deformed, thereby improving the sealing performance.

[0026] In order to facilitate the rapid disassembly of the large valve plate 12, bolt holes 122 are provided on the upper and lower surfaces of the large valve plate 12. When disassembling, the motor assembly 4 and the follower assembly 5 are first removed as a whole, and then the driving shaft 42 and the driven shaft 52 are removed. Finally, the lifting eye bolt 123 is tightened into the bolt hole 122, and the large valve plate 12 can be lifted out with the lifting rope.

[0027] The small valve group 2 includes a small valve body 21, a small valve plate 22, a small valve stem 23 and a square tube 24. The small valve body 21 is fixedly mounted on the large valve body 11. The square tube 24 is fixedly mounted on one side of the small valve body 21. Both ends of the axis of the small valve body 21 have round tubes 211 for mounting the small valve stem 23. The small valve stem 23 passes through the round tubes 211 at both ends of the small valve body 21 and the square tube 24. The small valve stem 23 is fixed to the side wall of the small valve body 21 and the end of the square tube 24 through square bearing seats 25 respectively. The small valve plate 22 is fixed on the small valve stem 23. As the small valve stem 23 rotates, the small valve body 21 is opened and closed. The cooperation of the whole small valve stem 23 and the small valve body 21 is ensured by the circular holes of the circular tubes 211 on both sides. The coaxiality and roughness of the circular holes are obtained by boring after welding. At the same time, in order to ensure the sealing of the small valve plate 22, grooves are opened on the circular tubes 211 on both sides to install O-rings 26. At the same time, the circular tubes 211 should enter the cavity of the small valve body 21 for a distance to facilitate the flushing with the small valve plate 22. In order to cooperate with the double rocker mechanism and avoid the bending moment of the small valve stem, the present invention extends a square tube on the small valve body and installs a square bearing seat, which has one less square bearing seat than the traditional design, avoiding the problem of over-positioning.

[0028] like Figure 1 As shown, the double rocker mechanism 3 includes a large swing arm 31, a small swing arm 32 and a connecting rod 33. One end of the large swing arm 31 is fixedly connected to the outer end of the driven shaft 52 of the follower assembly 5, and the other end is rotatably connected to one end of the connecting rod 33. The other end of the connecting rod 33 is rotatably connected to one end of the small swing arm 32, and the other end of the small swing arm 32 is fixedly connected to the outer end of the small valve stem 23. The motor assembly 4 drives the driving shaft 42 to rotate, driving the small valve stem 23 to rotate synchronously.

[0029] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A flue damper valve, comprising a large valve assembly (1), a motor assembly (4) and a follower assembly (5), wherein the large valve assembly (1) comprises a large valve body (11) and a large valve plate (12), wherein the large valve plate (12) is integrally inserted into the large valve body (11), wherein the motor assembly (4) and the follower assembly (5) are respectively arranged at two ends of an axis of the large valve body (11) and are fixedly connected to the large valve body (11) and the large valve plate (12), wherein the motor assembly (4) drives the large valve plate (12) to turn along the axis, and the follower assembly (5) rotates accordingly, thereby realizing the opening and closing of the large valve assembly (1), wherein a sealed air passage T is formed between the inner side of the large valve body (11) and the outer side of the large valve plate (12), wherein the motor assembly (4) drives the large valve plate (12) to turn along the axis, and the follower assembly (5) rotates accordingly, thereby realizing the opening and closing of the large valve assembly (1), and ... the motor assembly (4) drives the large valve plate (12) to turn along the axis, and the follower assembly (5) rotates accordingly, and wherein the motor assembly (4) drives the large valve plate (12) to turn along the axis, and the follower assembly (5) rotates accordingly, and wherein the motor assembly (4) drives the large valve plate (12) to turn along the axis, and the follower assembly (5) rotates accordingly, and wherein the motor assembly (4) drives the large valve plate (12) to turn along the axis, and the follower assembly (5) rotates accordingly, and wherein the motor assembly (4) drives the large valve plate (12) to turn along the axis The cavity formed at the connection between the motor assembly (4) and the follower assembly (5) and the large valve body (11) and the large valve plate (12) is communicated with the sealing air channel T, and the sealing air can pass through the cavity to form an air seal at the connection between the motor assembly (4) and the follower assembly (5) and the large valve body (11) and the large valve plate (12).

2. The flue damper valve according to claim 1, characterized in that: The large valve body (11) has connecting holes (111) at both ends of the axis, and the connecting hole (111) has a connecting flange (112) on the outside. The large valve plate (12) is disc-shaped and has a rotating shaft connecting portion (121) at both ends of the axis. The rotating shaft connecting portion (121) of the large valve plate (12) is aligned with the connecting hole (111) of the large valve body (11). The motor assembly (4) and the follower assembly (5) are respectively fixedly connected to the two ends of the large valve body (11) through the connecting flange (112) of the large valve body (11), and are fixedly connected to the large valve plate (12) through the rotating shaft connecting portion (121) of the large valve plate (12).

3. The flue damper valve according to claim 2, characterized in that: The motor assembly (4) comprises a motor seat (41) and a driving shaft (42), wherein the driving shaft (42) is coaxially arranged in the motor seat (41); the follower assembly (5) comprises a follower seat (51) and a driven shaft (52), wherein the driven shaft (52) is coaxially arranged in the follower seat (51); the rotating shaft connecting portion (121) of the large valve plate (12) comprises a rotating shaft connecting seat (1211) and a connecting ring (1212), wherein the connecting ring (1212) is coaxially arranged on the outer periphery of the rotating shaft connecting seat (1211) and has a gap with the rotating shaft connecting seat (1211); the driving shaft (42) and the driven shaft (52) are connected to each other. ) are respectively fixedly mounted on the rotating shaft connection parts (121) on both sides of the large valve plate (12); the motor seat (41) and the follower seat (51) have connection slots (411) at their ends and have a second connection flange (413) in the middle; the second connection flange (413) is fixedly connected to the first connection flange (112) of the large valve body (11); the connection slot (411) is used for nesting connection with the connection ring (1212); the connection point is a stopper one (SA1); the outer wall of the motor seat (41) and the follower seat (51) are tightly connected to the inner wall of the connection hole (111) of the large valve body (11); the connection point is a stopper two (SA2).

4. The flue damper valve according to claim 3, characterized in that: The connecting ring (1212) of the large valve plate (12) has rectangular grooves (12121) on both sides, so that the cavity formed between the inner wall of the motor seat (41) or the follower seat (51) and the inner wall of the connecting ring (1212) and the outer wall of the driving shaft (42) or the driven shaft (52) and the rotating shaft connecting seat (1211) is connected to the sealing air channel T, and the sealing air can pass into the cavity to perform air sealing on the stopper 1 (SA1).

5. The flue damper valve according to claim 4, characterized in that: The outer walls of the motor seat (41) and the follower seat (51) are provided with circular holes (412) evenly distributed around the circumference at the stop opening 2 (SA2) for blocking and sealing the flue air at the stop opening 2 (SA2) through sealing air. The motor seat (41), the follower seat (51) and the shaft connecting portion (121) are machined, and the matching clearance between the stop opening 1 (SA1) and the stop opening 2 (SA2) is obtained by machine processing, and the clearance size is controlled within 0.05-0.1 mm.

6. The flue damper valve according to claim 1, characterized in that: The small valve group (2) is mounted on the large valve body (11) and is in communication with the sealing air passage; the small valve group (2) is used to allow the sealing air to pass through.

7. The flue damper valve according to claim 1, characterized in that: The large valve assembly (1) further comprises an elastic sheet (13) and a pressure plate (14), wherein the pressure plate (14) is fixedly mounted at the upper and lower ends of the inner side of the circumference of the large valve body (11), and the upper and lower ends of the edge of the large valve plate (12) are sealedly connected to the pressure plate (14) via the elastic sheet (13); the pressure plate (14) comprises an upper pressure plate (141) and a lower pressure plate (142), wherein the elastic sheet (13) comprises an upper elastic sheet (131) and a lower elastic sheet (132), wherein one end of the upper elastic sheet (131) is fixedly connected to the upper edge of the large valve plate (12), and the other end is a free end, and can be fitted with the upper pressure plate (141) when closed; one end of the lower elastic sheet (132) is fixedly connected to the edge of the lower pressure plate (142), and the other end is a free end, and can be fitted with the lower edge of the large valve plate (12) when closed; the free end of the elastic sheet (13) is bent inwardly to form two inclined surfaces (133).

8. The flue damper valve according to claim 6, characterized in that: The small valve group (2) is connected to a motor assembly (4) via the double rocker mechanism (3) and is linked to a large valve group (1). When the large valve group (1) is closed, the small valve group (2) is opened; when the large valve group (1) is opened, the small valve group (2) is closed.

9. The flue damper valve according to claim 1, characterized in that: Bolt holes (122) are provided on the upper and lower sides of the plate surface of the large valve plate (12), and the bolt holes (122) are used to screw in eyebolts (123) to facilitate lifting out the large valve plate (12) when disassembling it.

10. The flue damper valve according to claim 6, characterized in that: The small valve group (2) comprises a small valve body (21), a small valve plate (22), a small valve stem (23) and a square tube (24); the small valve body (21) is fixedly mounted on the large valve body (11); the square tube (24) is fixedly mounted on one side of the small valve body (21); two ends of the axis of the small valve body (21) have round tubes (211); the small valve stem (23) passes through the round tubes (211) at both ends of the small valve body (21) and passes through the square tube (24); the small valve stem (23) is fixed to the side wall of the small valve body (21) and the end of the square tube (24) via square bearing seats (25) respectively; the small valve plate (22) is fixed to the small valve stem (23); as the small valve stem (23) rotates, the small valve body (21) is opened and closed.

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