Flue damper limiting device

Abstract

The utility model belongs to the technical field of flue flashboard installation, and relates to a flue flashboard limiting device which comprises a limiting frame, a movable flashboard and a positioning and fixing plate, and the limiting frame is connected with the movable flashboard in a sliding mode and abuts against a discharge flue through the positioning and fixing plate. And the movable flashboard can be driven to be inserted into the discharge flue to control flue gas flow. The utility model has the beneficial effects that the limiting frame is arranged to drive the movable flashboard to move stably, and the stability between the limiting frame and the discharge flue is enhanced through the fixed outer plate, the fixed inner plate and the positioning fixed plate, so that the smoke leakage can be avoided, and the smoke control can be better realized; water flow enters the water flow distribution groove through the flow guide pipe and the water inlet pipe, the movable flashboard can be rapidly cooled in a large area, the flashboard maintenance efficiency is improved, the cost is low, and the efficiency is high. And the rotatable movable scraping plate is arranged, impurities attached to the movable gate plate are cleaned in time, and the impurities are collected through the collecting box and then discharged.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue damper installation, in particular to a flue damper limiting device. Background Art

[0002] In the construction industry, in order to control the flow of smoke in the smoke exhaust duct, it is usually necessary to place a smoke damper in the smoke duct. When it is necessary to control the flow of smoke in the smoke exhaust duct, the smoke duct channel is opened and closed by raising and lowering the smoke damper. The way to fix the smoke damper is generally to set an opening groove at the top of the smoke exhaust duct, insert the smoke damper into the smoke exhaust duct, and then fix the damper and the slot of the smoke exhaust duct with bolts, and fill the gap with sealing material to prevent smoke leakage. Some methods also use a limit plate, fix the damper and the limit plate vertically, and then insert it into the slot, and then fix the limit plate and the smoke exhaust duct to each other. At the same time, the limit plate blocks the slot to ensure that the smoke does not leak out. Although the above two methods are low-cost, they are not firmly fixed, which can easily cause inaccurate smoke control and cause a greater risk of smoke leakage.

[0003] In addition, since the direction of smoke flow is parallel to the extension direction of the flue and perpendicular to the movement direction of the gate, under the influence of the fan draft, the flue gate, which originally moved up and down perpendicular to the extension direction of the flue, will move up and down at a certain angle, which can easily cause the flue gate to not open and close properly, and easily get stuck, causing smoke leakage, and thus making it impossible to achieve precise control of the smoke flow. In particular, when the gate needs to be replaced or repaired, the surface temperature of the gate must be lowered before the operation can be performed, which seriously affects the progress of the project. In addition, the flue gate will adhere to a large amount of impurities such as soot after working for a long time, and needs to be replaced frequently, which wastes costs. Therefore, a flue gate limit device is needed to solve the above technical problems. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, the utility model provides a flue damper limiting device to achieve stable and smooth opening and closing of the flue damper, and solves the technical problem that the flue damper is prone to getting stuck, resulting in inaccurate control.

[0005] The technical solution adopted in the embodiment of the utility model is: a flue damper limiting device can be connected to the smoke exhaust duct, including a limiting frame, a movable damper and a positioning and fixing plate. The limiting frame is slidably connected to the movable damper and abuts against the smoke exhaust duct through the positioning and fixing plate. The movable damper is driven to move and can be inserted into the smoke exhaust duct to control the flow of smoke.

[0006] Furthermore, two sides of the limiting frame are connected to the positioning fixing plate through a fixed outer plate and a fixed inner plate respectively, and the positioning fixing plate abuts against the smoke exhaust duct and the movable damper at the same time.

[0007] Furthermore, the fixed outer plate and the fixed inner plate are both of U-shaped structure, and a thermal expansion sheet is provided between the two and the smoke exhaust duct.

[0008] Furthermore, the limiting frame is provided with a limiting guide groove perpendicular to the length direction of the smoke exhaust duct, and is slidably connected to the movable gate through the limiting guide groove.

[0009] Furthermore, the limiting frame is provided with a guide transverse groove along the width direction of the smoke exhaust duct, and both ends of the guide transverse groove are connected to the limiting guide groove.

[0010] Furthermore, a movable plate is provided in the guide transverse groove, which is rotatably connected to the movable scraper. The movable scraper can be driven to scrape off impurities attached to the movable gate plate.

[0011] Furthermore, the end of the movable plate is rotatably connected to the synchronous rotating rod via a rotating plate, and the two synchronous rotating rods are connected to the limiting frame via a pulley.

[0012] Furthermore, a water flow distribution groove is provided in the movable gate plate, and the water flow distribution groove is connected with the return pipe through a guide vertical pipe.

[0013] Furthermore, the water flow distribution trough is connected to a sealing plug via a water inlet pipe, and the sealing plug is slidably connected to a flow guide cover.

[0014] Furthermore, the end of the flow guide cover away from the sealing plug is connected to the flow guide pipe, and the flow guide pipe and the return pipe are both connected to the water storage tank.

[0015] The advantages and positive effects of the utility model are as follows: a limit frame is set to drive the movable gate plate to move smoothly, and it is connected to the smoke exhaust duct through a fixed outer plate, a fixed inner plate and a positioning fixed plate, thereby enhancing the stability between the limit frame and the smoke exhaust duct, which can not only avoid smoke leakage, but also better realize smoke control; the water flow in the water storage tank enters the water flow distribution trough through the guide pipe and the water inlet pipe, which can quickly cool the movable gate plate over a large area, making it convenient for maintenance personnel to quickly repair the gate plate, thereby improving the efficiency of gate plate maintenance, with low cost and high efficiency; a rotatable movable scraper is set to clean impurities such as tar and smoke dust attached to the movable gate plate, and discharge them after collecting them through the collection box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of the embodiment provided by the utility model in use;

[0017] Figure 2 A schematic diagram of the movable damper in the embodiment provided by the utility model in the open state, wherein the arrow represents the direction of smoke flow;

[0018] Figure 3 A schematic cross-sectional view of the limiting frame of an embodiment provided by the utility model;

[0019] Figure 4 A schematic diagram of the three-dimensional structure of the movable plate of the embodiment provided by the utility model;

[0020] Figure 5 A schematic diagram of the three-dimensional structure of the movable scraper of the embodiment provided by the utility model;

[0021] Figure 6 A schematic diagram of the three-dimensional structure of a water storage tank according to an embodiment of the utility model;

[0022] Figure 7 A schematic diagram of a cross-sectional structure of a flow guide riser provided in an embodiment of the utility model;

[0023] Figure 8 This is a schematic diagram of the cross-sectional structure of the air deflector of an embodiment provided by the utility model.

[0024] In the figure:

[0025] 1. Limiting frame; 101. Limiting guide groove; 102. Movable gate; 103. Fixed outer plate; 104. Fixed inner plate; 105. Thermal expansion sheet; 106. Positioning fixing plate;

[0026] 2. Guide transverse groove; 201. movable plate; 202. movable scraper; 203. sealing element; 204. connecting rod; 205. synchronous rotating rod; 206. rotating plate; 207. collecting box;

[0027] 3. Water storage tank; 301. Diversion pipe; 302. Diversion cover; 303. Sealing plug; 304. Return pipe; 305. Water inlet pipe; 306. Water flow distribution trough; 307. Diversion vertical pipe;

[0028] 4. Smoke exhaust duct. DETAILED DESCRIPTION

[0029] An embodiment of the utility model provides a flue damper limiting device, which is described below in conjunction with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments.

[0030] A flue damper limiting device can be connected to a smoke exhaust duct, comprising a limiting frame, a movable damper and a positioning fixing plate. The limiting frame is slidably connected to the movable damper and abuts against the smoke exhaust duct through the positioning fixing plate. The movable damper is driven to move so that it can be inserted into the smoke exhaust duct to control the flow of smoke.

[0031] Preferably, two sides of the limiting frame are connected to the positioning fixing plate through a fixed outer plate and a fixed inner plate respectively, and the positioning fixing plate abuts against the smoke exhaust duct and the movable damper at the same time.

[0032] Preferably, the fixed outer plate and the fixed inner plate are both of U-shaped structure, and a thermal expansion sheet is provided between the two and the smoke exhaust duct.

[0033] Preferably, the limiting frame is provided with a limiting guide groove perpendicular to the length direction of the smoke exhaust duct, and is slidably connected to the movable gate plate through the limiting guide groove.

[0034] Preferably, the limiting frame is provided with a guide transverse groove along the width direction of the smoke exhaust duct, and both ends of the guide transverse groove are connected to the limiting guide groove.

[0035] Preferably, a movable plate is provided in the guide transverse groove, which is rotatably connected to the movable scraper. The movable scraper can be driven to scrape off impurities attached to the movable gate plate.

[0036] Preferably, the end of the movable plate is rotatably connected to the synchronous rotating rod via a rotating plate, and the two synchronous rotating rods are connected to the limiting frame via a pulley.

[0037] Preferably, a water flow distribution groove is provided in the movable gate plate, and the water flow distribution groove is connected with the return pipe through a guide vertical pipe.

[0038] Preferably, the water flow distribution trough is connected to a sealing plug via a water inlet pipe, and the sealing plug is slidably connected to a flow guide cover.

[0039] Preferably, the end of the flow guide cover away from the sealing plug is connected to the flow guide pipe, and the flow guide pipe and the return pipe are both connected to the water storage tank.

[0040] Embodiment 1:

[0041] The utility model proposes a flue damper limiting device, such as Figure 1 As shown, it includes a limit frame 1 fixed on the smoke exhaust duct 4. The limit frame 1 is a rectangular frame structure, and a movable gate 102 is connected to the inner side thereof. The movable gate 102 can be inserted into the smoke exhaust duct 4 to control the flow of smoke. When the movable gate 102 needs to be repaired or replaced, it is first pulled up and taken out before processing. A traction frame is installed on the top of the limit frame 1, and a driving cylinder is provided between the top of the limit frame 1 and the traction frame, and a servo motor is installed on one side of the top of the limit frame 1 and the inner side of the traction frame. Figure 3 As shown, a guide transverse groove 2 perpendicular to the smoke flow direction is opened on the front side of the limiting frame 1 , and the movable gate 102 moves downward, passes through the guide transverse groove 2 and is inserted into the smoke exhaust duct 4 .

[0042] like Figure 2 As shown, a limiting guide groove 101 is provided on the inner side (left and right sides) of the rectangular limiting frame 1, and the limiting guide groove 101 is connected with both ends of the guiding transverse groove 2, and the limiting guide groove 101 is slidably connected with the movable gate plate 102, so that the movable gate plate 102 can move up and down along the length direction of the limiting guide groove 101, and the switch movable gate plate 102 is stable and safe, not easy to deviate, and the opening and closing is more precise.

[0043] The top of the movable gate plate 102 is fixedly connected to the output end of the bottom of the driving cylinder at the top of the limiting frame 1 , and the driving cylinder can drive the movable gate plate 102 to move up and down along the limiting guide groove 101 .

[0044] A fixed outer plate 103 and a fixed inner plate 104 are respectively installed on the front and rear sides of the bottom of the limiting frame 1, and both the fixed outer plate 103 and the fixed inner plate 104 are of a U-shaped structure. The fixed outer plate 103 is at the front side of the fixed inner plate 104 (that is, along the direction of smoke flow, the fixed outer plate 103 is in front of the limiting frame 1, and the fixed inner plate 104 is at the rear), and the fixed outer plate 103 and the fixed inner plate 104 are both wrapped around the outside of the smoke exhaust duct 4, and both are connected to the positioning fixing plate 106 through a spring. With the help of the elastic force of the spring, the positioning fixing plate 106 is close to the outer wall of the smoke exhaust duct, and the end of the positioning fixing plate 106 that is close to the interactive gate plate 102 is an inclined structure, which can better contact with the movable gate plate 102, and the connection is more stable and can prevent smoke leakage. A thermal expansion sheet 105 is provided between the fixed outer plate 103 and the smoke exhaust duct 4 and between the fixed inner plate 104 and the smoke exhaust duct 4, which can better prevent smoke leakage and make the connection between the limiting frame 1 and the smoke exhaust duct more stable and firm.

[0045] In the embodiment of the present disclosure, when the above-mentioned limiting device is installed on the smoke exhaust duct 4, the installation end of the smoke exhaust duct 4 is inserted between the fixed outer plate 103 and the fixed inner plate 104, and the four sides where the fixed outer plate 103 and the fixed inner plate 104 are connected to the smoke exhaust duct 4 are provided with positioning fixing plates 106. Under the action of the above-mentioned spring, the positioning fixing plate 106 is moved to a suitable position on the outside of the smoke exhaust duct 4 to allow the movable gate plate 102 to be inserted into the smoke exhaust duct. At the same time, the inclined structures of the inner ends of the positioning fixing plates 106 on both sides are fitted with the movable gate plate 102, thereby improving the stability of the connection between the smoke exhaust duct 4 and the limiting frame 1. At this time, the movable gate plate 102 is inserted into the smoke exhaust duct to control the flow of smoke.

[0046] As the smoke flows in the smoke exhaust duct 4 and the limiting frame 1, the heat generated by the flowing smoke expands the thermal expansion sheet 105 between the fixed outer plate 103, the fixed inner plate 104 and the smoke exhaust duct 4, thereby making the connection between the smoke exhaust duct 4 and the limiting frame 1 more stable and preventing smoke leakage. The driving cylinder at the top of the limiting frame 1 drives the movable gate 102 to move up and down along the inner side of the limiting guide groove 101, thereby allowing the movable gate 102 to control the flow of smoke in the smoke exhaust duct 4. When the movable gate 102 needs to be repaired or replaced, it only needs to be taken out upwards, which is very convenient.

[0047] Embodiment 2

[0048] Based on the first embodiment, Figure 5 As shown, a movable plate 201 is slidably installed inside the guide transverse groove 2, and a groove is provided at the bottom of the movable plate 201. A movable scraper 202 is installed in the above groove through a rotating shaft. The movable scraper 202 can be rotated to clean the impurities such as tar and smoke attached to the movable gate plate 102. When the movable gate plate 102 moves upward, the movable scraper 202 rotates to clean the impurities attached to its surface. The side of the movable scraper 202 used for cleaning is a downward inclined structure, which cleans more thoroughly. Along the direction of smoke flow, the movable scraper 202 is located in front of the movable gate plate 102 for easy scraping;

[0049] like Figure 4 As shown, seals 203 are slidably installed on the left and right sides of the limit frame 1, and a driving handle is installed on the outer side of the seal 203. The seal 203 is installed below the guide groove 2. Figure 5 As shown, the left and right seals 203 are connected by a connecting rod 204, and the connecting rod 204 is a cylindrical structure. The left and right sides of the limit frame 1 are rotatably installed with a synchronous rotating rod 205 through a bearing seat. The synchronous rotating rod 205 is a cylindrical structure, and the tops of the two synchronous rotating rods 205 are connected to the output end of the servo motor on one side of the top of the limit frame 1 through a pulley. A rotating plate 206 is installed at the bottom of the synchronous rotating rod 205, and the rotating plate 206 is an elliptical structure. The outer sides of the two rotating plates 206 are rotatably installed on both sides of the movable plate 201.

[0050] like Figure 4As shown, a collecting box 207 is installed at the bottom of the movable gate plate 102. The collecting box 207 is an L-shaped structure. Both ends of the collecting box 207 move upward along the limiting guide groove 101. A sealing member 203 is also slidably installed on the inner side of the collecting box 207. When the flue gate plate (i.e., the movable gate plate 2) is running in the limiting device, the driving cylinder on the top of the limiting frame 1 drives the movable gate plate 102 to move upward. At the same time, the servo motor on one side of the top of the limiting frame 1 drives the two synchronous rotating rods 205 to rotate through the pulley, so that the bottom of the synchronous rotating rod 205 drives the rotating plate 206 to rotate. The far end point of one rotating plate 206 pushes the movable plate 201 to move laterally on the inner side of the guiding transverse groove 2, then the far end point of the rotating plate 206 in the opposite direction leaves the other end of the movable plate 201 and loses the thrust on the other end of the movable plate 201. The two rotating plates 206 continue to rotate, then the rotating plate 206 at the other end of the movable plate 201 pushes the movable plate 201 to move, then the movable The rotating plate 206 at one end of the plate 201 loses the push on the movable plate 201, and the two rotating plates 206 rotate at high speed to make the movable plate 201 move at high frequency inside the guide transverse groove 2. Under the action of the spring, the movable scraper 202 on the inner side of the movable plate 201 scrapes one side of the movable gate plate 102, and the inclined structure on the outer side of the movable scraper 202 cleans the tar, smoke and other impurities attached to one side of the movable gate plate 102. The cleaned impurities fall into the collection box 207 for collection, and the cleaned impurities are prevented from falling into the smoke exhaust duct 4, so that the movable gate plate 102 moves smoothly along the limiting guide groove 101. After the movable gate plate 102 moves upward, the seal 203 is pulled at any end on the left and right sides of the limiting frame 1, and one seal 203 drives the other seal 203 to move through the connecting rod 204, so that the seal 203 pushes the impurities collected in the collection box 207 out in time to prevent excessive accumulation of impurities.

[0051] Embodiment 3

[0052] Based on the first embodiment, Figure 1 and Figure 7 As shown, a water storage tank 3 is installed on the top rear side of the limiting frame 1, a water injection port is provided on the top of the water storage tank 3, and a water pump is installed on one side of the water storage tank 3. Figure 8 As shown, a guide pipe 301 is installed at the bottom of the water storage tank 3, a guide cover 302 is installed at the bottom of the guide pipe 301, an opening is provided at the bottom of the guide cover 302, a sealing plug 303 is installed on the inner side of the guide cover 302 through a spring, a cross-shaped slot is provided at the bottom of the sealing plug 303, and the bottom of the sealing plug 303 is slidably installed in the opening at the bottom of the guide cover 302. Figure 7As shown, a return pipe 304 is installed on the input end of the water pump on one side of the water storage tank 3, and the return pipe 304 passes through the top of the limiting frame 1 and the traction frame on the top of the limiting frame 1. A water inlet pipe 305 is installed on one side of the top of the movable gate plate 102. The water inlet pipe 305 is a tubular structure. The top of the water inlet pipe 305 is slidably installed in the opening at the bottom of the guide cover 302. The top of the water inlet pipe 305 pushes the bottom of the sealing plug 303 to move upward. A water flow distribution groove 306 is opened inside the movable gate plate 102, and a reinforcing rib is arranged inside the water flow distribution groove 306, and the top of the water flow distribution groove 306 is The inner side of the water flow distribution groove 306 is connected with the inner end of the water inlet pipe 305, and the other side of the water flow distribution groove 306 is installed with a guide vertical pipe 307. The bottom of the guide vertical pipe 307 is connected with the inside of the water flow distribution groove 306. The inner side of the guide vertical pipe 307 is slidably connected with the return pipe 304. When the movable gate 102 fails in the installation of the limit device, the top driving cylinder of the limit frame 1 drives the movable gate 102 to move upward to a higher position, then the water inlet pipe 305 on one side of the top of the movable gate 102 moves upward and is inserted into the opening at the bottom of the guide cover 302, then the top of the water inlet pipe 305 pushes the guide cover The sealing plug 303 in 302 moves upward, pushing the sealing plug 303 to move upward, so that the water in the water storage tank 3 flows to the inside of the guide cover 302 through the guide pipe 301, and then the water flows through the slot at the bottom of the sealing plug 303 and the water inlet pipe 305 to the inside of the water flow distribution groove 306. The water flow is distributed inside the water flow distribution groove 306, so that the water flow quickly cools down the hot movable gate 102, which is convenient for maintenance personnel to repair the gate in time and reduce the gate leaving the flue for a long time to affect the control of flue gas. After the maintenance is completed, the movable gate 102 drives the water inlet pipe 30 5 moves downward, the water inlet pipe 305 loses the thrust on the sealing plug 303, and the sealing plug 303 seals the opening at the bottom of the deflector 302 under the action of the spring, so that the water pump on one side of the water storage tank 3 works, and the return pipe 304 is inserted into the guide vertical pipe 307 to extract the water flow inside the water flow distribution groove 306, and the water flow enters the guide vertical pipe 307 through the bottom of the guide vertical pipe 307. The return pipe 304 moves upward to continuously extract the water flow in the water flow distribution groove 306 in the movable gate plate 102 that moves downward, which is convenient for later reuse, with low cost and high cooling effect.

[0053] When in use, the installation end of the smoke exhaust duct 4 is inserted between the fixed outer plate 103 and the fixed inner plate 104. Under the action of the spring, the positioning fixing plates 106 at four locations move on the outside of the smoke exhaust duct 4 to ensure a stable connection between the smoke exhaust duct 4 and the limiting frame 1. The heat generated by the flowing smoke causes the thermal expansion sheet 105 on the outside of the fixed inner plate 104 to expand, thereby supporting the side wall of the smoke exhaust duct 4, so that the installation limiting device can be stably installed. The driving cylinder on the top of the limiting frame 1 drives the movable gate plate 102 to move upward, and the servo motor on one side of the top of the limiting frame 1 drives the bottom of the two synchronous rotating rods 205 through the pulley. The rotating plate 206 at the top rotates, and the rotating plates 206 at two places rotate at high speed to push the movable plate 201 to move at high frequency in the guide transverse groove 2. Under the action of the spring, the movable scraper 202 on the inner side of the movable plate 201 scrapes one side of the movable gate plate 102 (the side facing the flue gas), and the inclined structure on the outer side of the movable scraper 202 cleans the tar, smoke and other impurities attached to one side of the movable gate plate 102. The cleaned impurities fall into the collection box 207 for collection. After the movable gate plate 102 moves upward, the seal 203 is pulled to push the impurities collected in the collection box 207 out in time.

[0054] When a failure occurs in the installation of the limit device on the flue damper (ie, the movable damper 102), the top driving cylinder of the limit frame 1 drives the movable damper 102 to move upward to a higher position. As the water inlet pipe 305 on one side of the top of the movable gate plate 102 moves upward and is inserted into the opening at the bottom of the deflector 302, it pushes the sealing plug 303 to move upward, and the water flow in the water storage tank 3 flows into the deflector 302 through the deflector pipe 301, and the water flow flows into the water flow distribution groove 306 through the water inlet pipe 305 through the groove at the bottom of the sealing plug 303. The water flow is distributed in the water flow distribution groove 306 to cool the hot movable gate plate 102, and then the movable gate plate 102 is pulled upward and the surface impurities are scraped off, so that the maintenance personnel can repair the movable gate plate in time. After the maintenance is completed, the movable gate plate 102 drives the water inlet pipe 305 to move downward, and under the action of the spring, the sealing plug 303 seals the opening at the bottom of the deflector 302, and the water pump on one side of the water storage tank 3 drives the return pipe 304 to be inserted into the deflection vertical pipe 307 to extract the water flow inside the water flow distribution groove 306 for use again next time.

[0055] The advantages and positive effects of the utility model are as follows: a limit frame is provided to drive the movable gate plate to move smoothly, and it is connected to the smoke exhaust duct by a fixed outer plate, a fixed inner plate and a positioning fixed plate, thereby enhancing the stability between the limit frame and the smoke exhaust duct, which can not only avoid smoke leakage, but also better realize smoke control; the water flow in the water storage tank enters the water flow distribution trough through the guide pipe and the water inlet pipe, which can quickly cool the movable gate plate over a large area, facilitate maintenance personnel to quickly repair the gate plate, improve the efficiency of gate plate maintenance, and have low cost and high efficiency; a rotatable movable scraper is provided to clean impurities such as tar and smoke attached to the movable gate plate, and discharge them after being collected through a collection box.

[0056] The above is a detailed description of the embodiments of the utility model, but the contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A flue damper limiting device, which can be connected to a flue, is characterized by: It includes a limit frame, a movable damper and a positioning and fixing plate. The limit frame is slidably connected with the movable damper and abuts against the smoke exhaust duct through the positioning and fixing plate. The movable damper can be driven to move and inserted into the smoke exhaust duct to control the flow of smoke.

2. The flue damper limiting device according to claim 1 is characterized in that: Both sides of the limiting frame are connected to the positioning fixing plate through a fixed outer plate and a fixed inner plate respectively, and the positioning fixing plate abuts against the smoke exhaust duct and the movable damper at the same time.

3. The flue damper limiting device according to claim 2 is characterized in that: The fixed outer plate and the fixed inner plate are both of U-shaped structure, and a thermal expansion sheet is arranged between the fixed outer plate and the smoke exhaust duct.

4. The flue damper limiting device according to any one of claims 1 to 3, characterized in that: The limiting frame is provided with a limiting guide groove perpendicular to the length direction of the smoke exhaust duct, and is slidably connected with the movable gate through the limiting guide groove.

5. The flue damper limiting device according to claim 4 is characterized in that: The limiting frame is provided with a guide transverse groove along the width direction of the smoke exhaust duct, and both ends of the guide transverse groove are connected to the limiting guide groove.

6. The flue damper limiting device according to claim 5 is characterized in that: A movable plate is provided in the guide transverse groove and is rotatably connected to a movable scraper. The movable scraper can be driven to scrape off impurities attached to the movable gate plate.

7. The flue damper limiting device according to claim 6 is characterized in that: The end of the movable plate is rotatably connected to the synchronous rotating rod through a rotating plate, and the two synchronous rotating rods are connected to the limiting frame through a pulley.

8. The flue damper limiting device according to any one of claims 5 to 7, characterized in that: A water flow distribution groove is arranged in the movable gate plate, and the water flow distribution groove is communicated with the return pipe through a guide vertical pipe.

9. The flue damper limiting device according to claim 8, characterized in that: The water flow distribution trough is connected to the sealing plug through a water inlet pipe, and the sealing plug is slidably connected to the guide cover.

10. The flue damper limiting device according to claim 9, characterized in that: The end of the flow guide cover away from the sealing plug is connected to the flow guide pipe, and the flow guide pipe and the return pipe are both connected to the water storage tank.

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