Large flue built-in evaporator

Abstract

The application relates to a large flue built-in evaporator, belonging to the technical field of evaporators, which comprises a shell, two sealing boxes and a connecting pipe, the two sealing boxes are arranged on opposite sides of the shell and fixedly connected with the shell, the sealing boxes are communicated with the shell, the connecting pipe is arranged in the shell, the two ends of the connecting pipe penetrate through the two sealing boxes and are fixedly connected with the sealing boxes, an air extraction shell is arranged at the connecting position of the sealing box and the connecting pipe, one end of the air extraction shell facing the connecting pipe is arranged as an opening, one side of the air extraction shell and the outer wall of the sealing box are fixedly connected, an air extraction pipeline is fixedly connected with the end of the air extraction shell far from the connecting pipe, the air extraction pipeline is communicated with the air extraction shell, the end of the air extraction pipeline far from the air extraction shell is fixedly connected with the side wall of the shell, the air extraction pipeline is communicated with the shell, an air extraction device for extracting air towards the air extraction pipeline is arranged in the air extraction shell, and the application has the effect of improving the utilization rate of flue gas waste heat.

Description

Technical Field

[0001] This application relates to the technical field of evaporators, and in particular to an evaporator with a large flue built-in. Background Technology

[0002] The evaporator built into the flue is a form of waste heat recovery and utilization in the flue. Specifically, the main flue is divided into two sections by the evaporator: the first main flue and the second main flue. The first main flue is connected to the inlet of the evaporator, and the second main flue is connected to the outlet of the evaporator. The heat of the waste gas in the flue is absorbed and reused in the evaporator.

[0003] The existing flue-mounted evaporator mainly consists of an outer shell, with an air outlet on the top wall and an air inlet on the bottom side wall. Sealing boxes are fixedly connected to opposite sides of the outer shell, and these sealing boxes are connected to the shell. A descending box and a rising box are respectively located on opposite sides of the outer shell. A connecting pipe is fixedly connected to the descending box, with the end of the connecting pipe away from the descending box passing through the sealing boxes and rising box on both sides of the shell. The connecting pipe also passes through the inside of the shell and is welded to the side wall of the sealing box. During operation, water is supplied to the descending box, increasing the water pressure. The water moves along the connecting pipe. When the water reaches the shell, flue gas simultaneously enters the shell. The flue gas contacts the connecting pipe and releases heat, raising the temperature of the connecting pipe. This, in turn, raises the temperature of the water, generating steam. The steam then travels along the connecting pipe to the rising box, where it is then discharged for reuse.

[0004] Regarding the aforementioned technologies, the flue gas temperature is prone to fluctuations due to the actual production conditions of the processed materials and the composition of the flue gas. When the temperature exceeds the rated value that the connecting pipe can withstand, the connecting pipe is prone to expansion, causing cracks at the weld between the connecting pipe and the side wall of the sealing box. To prevent the flue gas inside the shell from spreading out of the shell through the cracks, it is necessary to first intercept the inlet and outlet of the main flue and guide the flue gas to the bypass for discharge, and then repair the evaporator. During the evaporator repair process, it is not easy to recover and utilize the waste heat of the flue gas, resulting in a low utilization rate of waste heat of the flue gas. Summary of the Invention

[0005] In order to improve the utilization rate of flue gas waste heat, this application provides a large flue-mounted evaporator.

[0006] The technical solution for a large flue-mounted evaporator provided in this application is as follows: A large flue-mounted evaporator includes a shell, a sealing box, and a connecting pipe. Two sealing boxes are provided, each located on opposite sides of the shell and fixedly connected to it. The sealing boxes and the shell are in communication. The connecting pipe is located inside the shell, with both ends penetrating through and fixedly connecting to the two sealing boxes. A draft shell is provided at the connection point between the sealing box and the connecting pipe. The end of the draft shell facing the connecting pipe is open, and one side of the draft shell is fixedly connected to the outer wall of the sealing box. A draft duct is fixedly connected to the end of the draft shell away from the connecting pipe, and the draft duct is in communication with the draft shell. The end of the draft duct away from the draft shell is fixedly connected to the side wall of the shell, and the draft duct is in communication with the shell. An exhaust device is provided inside the draft shell to draw air towards the draft duct.

[0007] By adopting the above technical solution, when a crack occurs at the weld, in order to reduce downtime, the weld is not repaired during operation. Repair is carried out after the machine stops. At the same time, the flue gas inside the shell moves out of the shell through the sealed box from the crack. The exhaust device draws the flue gas into the exhaust duct. The flue gas re-enters the shell along the exhaust duct, and the heat of the flue gas is recovered and utilized. There is no need to intercept the inlet and outlet of the large flue and lead the flue gas to the bypass for discharge, thereby improving the utilization rate of flue gas waste heat.

[0008] Optionally, a first support plate is provided inside the exhaust casing. The first support plate and the exhaust casing are parallel to the side wall of the exhaust pipe. A first support rod is fixedly connected to the side wall of the first support plate. The end of the first support rod away from the first support plate is fixedly connected to the inner wall of the exhaust pipe. The exhaust device includes a first rotating rod and a first fan blade. The first rotating rod is located on the side of the first support plate away from the connecting pipe. The first rotating rod is perpendicular to the first support plate. The end of the first rotating rod near the first support plate passes through the first support plate and is rotatably connected to it. Multiple first fan blades are provided. Multiple first fan blades are all located on the end of the first rotating rod near the connecting pipe. Multiple first fan blades are all fixedly connected to the first rotating rod and arranged along the circumferential side wall of the first rotating rod. A motor is fixedly connected to one side wall of the exhaust casing. A first bevel gear is fixedly connected to the output shaft of the motor. A second bevel gear is provided on the side of the first support plate away from the connecting pipe. The first rotating rod and the second bevel gear are fixedly connected and mesh with each other.

[0009] By adopting the above technical solution, the motor is started, which drives the first bevel gear to rotate, the first bevel gear to rotate the second bevel gear, the second bevel gear to rotate the first rotating rod, and the first rotating rod to rotate the first fan blade. The first fan blade discharges the flue gas in the exhaust casing toward the exhaust duct, thus the exhaust device realizes the function of moving the flue gas toward the exhaust duct.

[0010] Optionally, a second support plate is provided at the connection between the exhaust duct and the housing. The second support plate and the housing are parallel to the side wall of the exhaust duct. A second support rod is fixedly connected to the side wall of the second support plate. The end of the second support rod away from the second support plate is fixedly connected to the exhaust duct. A second rotating rod is provided on the side of the second support plate facing the inside of the exhaust duct. The second rotating rod is perpendicular to the second support plate. The end of the second rotating rod near the second support plate passes through the second support plate and is rotatably connected to it. A plurality of second fan blades are fixedly connected to the end of the second rotating rod near the housing. The plurality of second fan blades are all located in the same cross section of the second rotating rod. A linkage component for linking the first rotating rod and the second rotating rod is provided inside the exhaust duct.

[0011] By adopting the above technical solution, during the rotation of the first rotating rod, the second rotating rod is driven to rotate through the linkage component. The second rotating rod drives the second fan blade to rotate, and the second fan blade draws the flue gas in the exhaust duct into the housing. The arrangement of the second rotating rod and the second fan blade accelerates the movement speed of the flue gas in the exhaust duct.

[0012] Optionally, the exhaust duct includes a first duct and a second duct. One end of the first duct is fixedly connected to the exhaust housing, and the first duct and the exhaust housing are connected. The end of the first duct away from the exhaust housing is fixedly connected to the second duct. The length direction of the first duct and the length direction of the second duct are perpendicular and connected. The end of the second duct away from the first duct is fixedly connected to the housing and is connected. The linkage component is disposed inside the first duct.

[0013] By adopting the above technical solution, the flue gas enters the first pipe from the exhaust casing, then enters the second pipe, and then enters the casing from the second pipe, thus guiding the flue gas. At the same time, the linkage component is set inside the first pipe, reducing damage to the exhaust pipe, thereby making it difficult for the flue gas to be discharged to the outside from the exhaust pipe.

[0014] Optionally, the end of the first rotating rod away from the first fan blade extends into the first pipe and is rotatably connected to the inner wall of the first pipe. The end of the second rotating rod away from the second fan blade extends along the second pipe into the first pipe and is rotatably connected to the inner wall of the first pipe. The linkage assembly includes a first sprocket, a second sprocket, and a chain. The first sprocket is located at the end of the first rotating rod inside the first pipe. The first rotating rod passes through the first sprocket and is fixedly connected to it. The second sprocket is located at the end of the second rotating rod inside the first pipe. The second rotating rod passes through the second sprocket and is fixedly connected to it. The chain is sleeved on the outside of the first sprocket and the second sprocket and meshes with both.

[0015] By adopting the above technical solution, the first rotating rod drives the first sprocket to rotate, the first sprocket drives the chain to rotate, the chain drives the second sprocket to rotate, and the second sprocket drives the second rotating rod to rotate, thereby realizing the linkage between the first rotating rod and the second rotating rod.

[0016] Optionally, a corrugated pipe is welded to the outer wall of the sealing box on the side away from the shell. The length direction of the corrugated pipe is perpendicular to the sealing box. A fixing plate is welded to the end of the corrugated pipe away from the sealing box. The fixing plate is perpendicular to the length direction of the corrugated pipe. A connecting pipe passes through the corrugated pipe and passes through the fixing plate and is welded and fixed.

[0017] By adopting the above technical solution, when the connecting pipe expands due to heat, the connecting pipe drives the fixed plate to move, and the fixed plate drives the corrugated pipe to stretch. Through the buffering effect of the corrugated pipe, the weld between the connecting rod and the fixed plate is less likely to crack.

[0018] Optionally, the sealing box has a U-shaped groove on the outer circumferential side wall near one end of the shell, and the U-shaped groove is connected end to end.

[0019] By adopting the above technical solution, when the sealing box expands due to heat, the sealing box can be buffered at the U-shaped groove, making it less likely for gaps to form at the connection between the sealing box and the shell.

[0020] Optionally, a buffer plate is provided on the side of the second fan blade away from the second support plate. The buffer plate is parallel to the second support plate, and the side of the buffer plate facing the second rotating rod is fixedly connected to the second rotating rod.

[0021] By adopting the above technical solution, during the rotation of the second rotating rod, the second rotating rod drives the buffer plate to move. After the second fan blade discharges the flue gas in the exhaust pipe into the housing, the buffer plate blocks the flue gas in the housing, causing the flue gas to diffuse in all directions, making it difficult for the flue gas to move out of the housing quickly from the air outlet.

[0022] Optionally, a sealing cover is provided at the end of the exhaust casing away from the first pipe, and a moving component is provided at the exhaust casing to drive the sealing cover to move.

[0023] By adopting the above technical solution, when air leakage occurs at the connection between the connecting pipe and the fixed plate, the moving component drives the sealing cover to move towards the exhaust shell, and the sealing cover and the exhaust shell abut against each other, making it difficult for the flue gas inside the exhaust shell to diffuse to the outside of the exhaust shell.

[0024] Optionally, the exhaust casing is fixedly connected to the outer walls on opposite sides with a first connecting plate. The first connecting plate and the sealing cover are parallel. The moving component includes a second connecting plate and a lead screw. There are two second connecting plates and two lead screws, each corresponding to the other. The two second connecting plates are fixedly connected to the outer walls on opposite sides of the sealing cover. The second connecting plate and the first connecting plate are parallel. The lead screw is located on the side of the first connecting plate away from the second connecting plate. The length direction of the lead screw is perpendicular to the first connecting plate. The end of the lead screw near the first connecting plate passes through the first connecting plate and the second connecting plate. The lead screw and the first connecting plate are rotatably connected. The lead screw and the second connecting plate are threadedly connected.

[0025] By adopting the above technical solution, two lead screws are rotated simultaneously. Under the guidance of the sealing cover, the lead screws drive the second connecting plate to move, and the second connecting plate drives the sealing cover to move. Thus, the moving component realizes the function of driving the sealing cover to move.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. When the weld of the connecting pipe cracks, the overflowing flue gas is drawn into the exhaust duct by the exhaust device and then re-enters the shell along the exhaust duct to recover and utilize the heat of the flue gas. There is no need to intercept the inlet and outlet of the large flue and lead the flue gas to the bypass for discharge, thereby improving the utilization rate of the waste heat of the flue gas. 2. The linkage component drives the second rotating rod to rotate, which in turn drives the second fan blade to rotate, and the second fan blade accelerates the flow of flue gas in the exhaust duct. 3. Through the buffering effect of the bellows, the expansion of the connecting pipe causes the bellows to stretch, thus making it less likely for the weld between the connecting pipe and the fixing plate to crack. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a large flue-mounted evaporator according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating the structure of the bellows in the embodiments of this application; Figure 3 This is a cross-sectional view of the internal structure of the exhaust duct in the embodiments of this application; Figure 4 This is a schematic diagram illustrating the structure of the mobile component in the embodiments of this application.

[0028] In the diagram, 1. Shell; 11. Sealing box; 111. U-shaped groove; 12. Connecting pipe; 13. Buffer plate; 2. Exhaust shell; 21. First support plate; 22. First support rod; 23. Motor; 24. First bevel gear; 25. Second bevel gear; 26. First connecting plate; 3. Exhaust duct; 31. First duct; 32. Second duct; 4. Exhaust device; 41. First rotating rod; 42. First fan blade; 5. Second support plate; 51. Second support rod; 52. Second rotating rod; 53. Second fan blade; 6. Linkage assembly; 61. First sprocket; 62. Second sprocket; 63. Chain; 7. Corrugated pipe; 71. Fixing plate; 8. Sealing cover; 9. Moving assembly; 91. Second connecting plate; 92. Lead screw. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0030] This application discloses a built-in evaporator in a large flue.

[0031] refer to Figure 1 A large flue-mounted evaporator includes a shell 1, a sealing box 11, and a connecting pipe. There are two sealing boxes 11, which are respectively located on opposite sides of the shell 1. The sealing boxes 11 and the shell 1 are welded and fixed. The connecting pipe 12 is located inside the shell 1, and the opposite ends of the connecting pipe 12 pass through the two sealing boxes 11 and extend to the outside of the sealing boxes 11.

[0032] Moisture enters the housing 1 from one end of the connecting pipe 12, while flue gas enters the housing 1 at the same time. The connecting pipe 12 absorbs the heat of the flue gas, and the temperature of the connecting pipe 12 rises, which in turn raises the temperature of the water inside the connecting pipe 12, generating water vapor. The water vapor then moves out of the housing 1 from the other end of the connecting pipe 12 and is utilized, thus the evaporator realizes the recovery and utilization of the heat of the flue gas.

[0033] refer to Figure 1 and Figure 2 A corrugated pipe 7 is welded to the side of the sealing box 11 away from the shell 1. The length direction of the corrugated pipe 7 is perpendicular to the sealing box 11. The corrugated pipe 7 and the connecting pipe 12 are inserted and matched. A fixing plate 71 is fixedly connected to the end of the corrugated pipe 7 away from the sealing box 11. The fixing plate 71 is perpendicular to the length direction of the corrugated pipe 7. The connecting pipe 12 passes through the corrugated pipe 7 and passes through the fixing plate 71 and is welded and fixed.

[0034] When the connecting pipe 12 expands due to heat, the connecting pipe 12 drives the fixed plate 71 to move, and the fixed plate 71 drives the corrugated pipe 7 to extend or contract. The corrugated pipe 7 plays a buffering role, making it less likely for the weld between the connecting pipe 12 and the fixed plate 71 to crack, and also less likely for the weld between the corrugated pipe 7 and the sealing box 11 to crack.

[0035] refer to Figure 1 The sealing box 11 has a U-shaped groove 111 on its outer circumferential side wall near one end of the housing 1. The U-shaped groove 111 is connected end to end. When the sealing box 11 expands due to heat, it expands at the U-shaped groove 111. The U-shaped groove 111 provides a buffer for directional expansion, thus making it less likely for the weld between the sealing box 11 and the housing 1 to break.

[0036] refer to Figure 1 and Figure 3A vent housing 2 is fixedly connected to the side of the sealing box 11 away from the housing 1. One end of the vent housing 2 is open. The corrugated pipe 7 and the fixing plate 71 both penetrate the open end of the vent housing 2 and extend into the vent housing 2. The connecting pipe 12 penetrates the side wall of the vent housing 2 away from the housing 1 and extends out of the vent housing 2. A vent pipe 3 is provided on the outer side wall of the side wall of the vent housing 2 away from the opening. The vent pipe 3 includes a first pipe 31 and a second pipe 32. The first pipe 31 is fixedly connected to the side wall of the vent housing 2 away from the opening and is connected to the vent housing 2. The length direction of the first pipe 31 is parallel to the length direction of the housing 1. One end of the first pipe 31 is even fixedly connected to the second pipe 32 directly below the housing 1. The length direction of the second pipe 32 is perpendicular to the length direction of the first pipe 31. The end of the second pipe 32 away from the first pipe 31 is fixedly connected to the side wall of the housing 1. The second pipe 32 is connected to the housing 1. A first support plate 21 is provided at the connection between the first pipe 31 and the exhaust shell 2. The first support plate 21 and the side wall of the exhaust shell 2 away from the opening are parallel. Multiple first support rods 22 are fixedly connected to the side wall of the first support plate 21. The first supports are in the same horizontal plane. The end of the first support rod 22 away from the first support plate 21 is fixedly connected to the inner wall of the first pipe 31. An exhaust device 4 for exhausting air into the first pipe 31 is provided at the connection between the first pipe 31 and the exhaust shell 2.

[0037] The exhaust device 4 includes a first rotating rod 41 and a first fan blade 42. The first rotating rod 41 passes through the first support plate 21 and is rotatably connected to it. The length direction of the first rotating rod 41 is perpendicular to the first support plate 21. Multiple first fan blades 42 are provided, and all of them are located on the side of the first support plate 21 facing the exhaust shell 2. All of the multiple first fan blades 42 are connected and fixed to the rotating rod. The multiple first fan blades 42 are in the same horizontal plane. A motor 23 is fixedly connected to the outer wall of the exhaust shell 2 away from the shell 1. The output shaft of the motor 23 passes through the side wall of the exhaust shell 2 and extends into the exhaust shell 2. A first bevel gear 24 is fixedly connected to the output shaft of the motor 23. The first bevel gear 24 is located inside the exhaust shell 2. A second bevel gear 25 is provided on the side of the first fan blade 42 away from the first support plate 21. The second bevel gear 25 is fixedly connected to the first rotating rod 41. The first bevel gear 24 and the second bevel gear 25 mesh. The end of the first rotating rod 41 away from the second bevel gear 25 is rotatably connected to the inner wall of the first pipe 31.

[0038] When the weld between the connecting pipe 12 and the fixing plate 71 cracks, the flue gas enters the exhaust housing 2, and the motor 23 is started. The motor 23 drives the first bevel gear 24 to rotate, the first bevel gear 24 drives the second bevel gear 25 to rotate, the second bevel gear 25 drives the first rotating rod 41 to rotate, and the first rotating rod 41 drives the first fan blade 42 to rotate. During the rotation of the first fan blade 42, the flue gas in the exhaust housing 2 is discharged into the first pipe 31. Then the flue gas enters the housing 1 through the second pipe 32 along the first pipe 31, and the flue gas is reused.

[0039] refer to Figure 1 and Figure 3 A second support plate 5 is provided inside the second pipe 32 near the end of the housing 1. The second support plate 5 is parallel to the first support plate 21. Multiple second support rods 51 are fixedly connected to the side wall of the second support plate 5. The multiple second support rods 51 are in the same horizontal plane. The end of the second support rod 51 away from the second support plate 5 is fixedly connected to the inner wall of the second pipe 32. A second rotating rod 52 is provided at the second support plate 5. The length direction of the second rotating rod 52 is parallel to the length direction of the first rotating rod 41. The end of the second rotating rod 52 near the housing 1 passes through the second support plate 5 and extends into the housing 1. The second rotating rod 52 and the first support plate 21 are parallel to each other. Two support plates 5 are rotatably connected. The end of the second rotating rod 52 away from the housing 1 extends into the first pipe 31 and is rotatably connected to the inner wall of the first pipe 31. Multiple second fan blades 53 are fixedly connected to the circumferential side wall of the end of the second rotating rod 52 near the housing 1. The second fan blades 53 are located on the side of the second support plate 5 facing the housing 1. The multiple second fan blades 53 are in the same horizontal plane. A buffer plate 13 is provided inside the housing 1. The buffer plate 13 is fixedly connected to the second rotating rod 52. The buffer plate 13 and the second rotating rod 52 are perpendicular. A linkage assembly 6 for linkage between the first rotating rod 41 and the second rotating rod 52 is provided inside the first pipe 31.

[0040] The linkage assembly 6 includes a first sprocket 61, a second sprocket 62, and a chain 63. The first sprocket 61 is located at the end of the second rotating rod 52 away from the second bevel gear 25 and is fixedly connected to the first rotating rod 41. The second sprocket 62 is located at the end of the second rotating rod 52 away from the buffer plate 13 and is fixedly connected to the second rotating rod 52. The chain 63 is sleeved on the outside of the first sprocket 61 and the second sprocket 62, and the chain 63 is engaged with both.

[0041] The first rotating rod 41 drives the first sprocket 61 to rotate, the first sprocket 61 drives the chain 63 to rotate, the chain 63 drives the second sprocket 62 to rotate, the second sprocket 62 drives the second rotating rod 52 to rotate, and the second rotating rod 52 drives the second fan blade 53 to rotate. During the rotation of the second fan blade 53, the speed at which the flue gas in the exhaust duct 3 moves towards the housing 1 is accelerated. At the same time, when the flue gas is discharged from the second duct 32 into the housing 1, the buffer plate 13 blocks the flue gas, causing the flue gas to diffuse in all directions.

[0042] refer to Figure 2 and Figure 4 A sealing plate is provided at the opening end of the exhaust shell 2. A first connecting plate 26 is fixedly connected to the outer walls of the opposite sides of the sealing plate. The first connecting plate 26 is parallel to the sealing cover 8. A moving component 9 is provided at the exhaust shell 2 to drive the sealing cover 8 to move up and down.

[0043] The movable component 9 includes a second connecting plate 91 and a lead screw 92. There are two second connecting plates 91 and two lead screws 92, which correspond to each other. The two second connecting plates 91 are fixedly connected to the outer walls of opposite sides of the sealing cover 8. The second connecting plates 91 are parallel to the first connecting plates. The two lead screws 92 are respectively located on the side of the two first connecting plates away from the second connecting plates 91. The length direction of the lead screw 92 is perpendicular to the first connecting plate 26. The lead screw 92 passes through the first connecting plate 26 and the second connecting plate 91. The lead screw 92 and the first connecting plate 26 are rotatably connected. The lead screw 92 and the second connecting plate 91 are threadedly connected.

[0044] When the weld between the fixed plate 71 and the connecting pipe 12 cracks, the screw 92 is rotated. Under the guidance of the sealing cover 8, the screw 92 drives the second connecting plate 91 to move. The second connecting plate 91 drives the sealing cover 8 to move. The sealing cover 8 seals the opening of the exhaust shell 2, making it difficult for the flue gas to diffuse outside the exhaust shell 2.

[0045] The implementation principle of the built-in evaporator in the large flue of this application embodiment is as follows: when the weld between the connecting pipe 12 and the fixing plate 71 cracks, the flue gas diffuses from the crack into the exhaust shell 2. The exhaust device 4 draws the flue gas in the exhaust shell 2 into the exhaust pipe 3. The flue gas enters the shell 1 along the exhaust pipe 3 and is reused. There is no need to lead the flue gas to the bypass for discharge, thereby improving the utilization rate of the waste heat of the flue gas.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large flue-mounted evaporator, comprising a shell (1), a sealing box (11), and a connecting pipe (12), wherein two sealing boxes (11) are provided, the two sealing boxes (11) are respectively disposed on opposite sides of the shell (1) and fixedly connected to the shell (1), the sealing boxes (11) and the shell (1) are connected in communication, the connecting pipe (12) is disposed inside the shell (1), and the two ends of the connecting pipe (12) respectively pass through the two sealing boxes (11) and are fixedly connected, characterized in that: A ventilation shell (2) is provided at the connection between the sealing box (11) and the connecting pipe (12). The end of the ventilation shell (2) facing the connecting pipe (12) is set as an opening. One side of the ventilation shell (2) is fixedly connected to the outer wall of the sealing box (11). A ventilation pipe (3) is fixedly connected to the end of the ventilation shell (2) away from the connecting pipe (12). The ventilation pipe (3) is connected to the ventilation shell (2). The end of the ventilation pipe (3) away from the ventilation shell (2) is fixedly connected to the side wall of the shell (1). The ventilation pipe (3) is connected to the shell (1). A ventilation device (4) is provided inside the ventilation shell (2) to draw air in the direction of the ventilation pipe (3).

2. The built-in evaporator in a large flue according to claim 1, characterized in that: The exhaust casing (2) is provided with a first support plate (21). The first support plate (21) and the exhaust casing (2) are parallel to the side wall of the exhaust pipe (3). A first support rod (22) is fixedly connected to the side wall of the first support plate (21). The end of the first support rod (22) away from the first support plate (21) is fixedly connected to the inner wall of the exhaust pipe (3). The exhaust device (4) includes a first rotating rod (41) and a first fan blade (42). The first rotating rod (41) is located on the side of the first support plate (21) away from the connecting pipe (12). The first rotating rod (41) is perpendicular to the first support plate (21). The end of the first rotating rod (41) near the first support plate (21) passes through the first support plate (21) and the first fan blade (42). A support plate (21) is rotatably connected. Multiple first fan blades (42) are provided. Multiple first fan blades (42) are all located at the end of the first rotating rod (41) near the connecting pipe (12). Multiple first fan blades (42) are fixedly connected to the first rotating rod (41) and arranged along the circumferential side wall of the first rotating rod (41). A motor (23) is fixedly connected to one side wall of the exhaust shell (2). A first bevel gear (24) is fixedly connected to the output shaft of the motor (23). A second bevel gear (25) is provided on the side of the first support plate (21) away from the connecting pipe (12). The first rotating rod (41) and the second bevel gear (25) are fixedly connected. The first bevel gear (24) and the second bevel gear (25) mesh.

3. The large flue-mounted evaporator according to claim 2, characterized in that: A second support plate (5) is provided at the connection between the exhaust duct (3) and the housing (1). The second support plate (5) and the housing (1) are parallel to the side wall of the exhaust duct (3). A second support rod (51) is fixedly connected to the side wall of the second support plate (5). The end of the second support rod (51) away from the second support plate (5) is fixedly connected to the exhaust duct (3). A second rotating rod (52) is provided on the side of the second support plate (5) facing the inside of the exhaust duct (3). The second rotating rod (52) is perpendicular to the second support plate (5). The end of the second rotating rod (52) near the second support plate (5) passes through the second support plate (5) and is rotatably connected to the second support plate (5). A plurality of second fan blades (53) are fixedly connected to the end of the second rotating rod (52) near the housing (1). The plurality of second fan blades (53) are all located in the same cross section of the second rotating rod (52). A linkage component (6) for linking the first rotating rod (41) and the second rotating rod (52) is provided inside the exhaust duct (3).

4. The large flue-mounted evaporator according to claim 3, characterized in that: The exhaust pipe (3) includes a first pipe (31) and a second pipe (32). One end of the first pipe (31) is fixedly connected to the exhaust shell (2). The first pipe (31) and the exhaust shell (2) are connected. The end of the first pipe (31) away from the exhaust shell (2) is fixedly connected to the second pipe (32). The length direction of the first pipe (31) and the length direction of the second pipe (32) are perpendicular and connected. The end of the second pipe (32) away from the first pipe (31) is fixedly connected to the shell (1) and connected. The linkage component (6) is set inside the first pipe (31).

5. The built-in evaporator in a large flue according to claim 4, characterized in that: The first rotating rod (41) extends into the first pipe (31) at the end away from the first fan blade (42) and is rotatably connected to the inner wall of the first pipe (31). The second rotating rod (52) extends into the first pipe (31) along the second pipe (32) at the end away from the second fan blade (53) and is rotatably connected to the inner wall of the first pipe (31). The linkage assembly (6) includes a first sprocket (61), a second sprocket (62), and a chain (63). The first sprocket (61) is located at the end of the first rotating rod (41) inside the first pipe (31). The first rotating rod (41) passes through the first sprocket (61) and is fixedly connected to the first sprocket (61). The second sprocket (62) is located at the end of the second rotating rod (52) inside the first pipe (31). The second rotating rod (52) passes through the second sprocket (62) and is fixedly connected to the second sprocket (62). The chain (63) is sleeved on the outside of the first sprocket (61) and the second sprocket (62) and meshes with both.

6. The built-in evaporator in a large flue according to claim 1, characterized in that: The sealing box (11) has a corrugated pipe (7) welded to the outer wall on the side away from the shell (1). The length direction of the corrugated pipe (7) is perpendicular to the sealing box (11). A fixing plate (71) is welded to the end of the corrugated pipe (7) away from the sealing box (11). The fixing plate (71) is perpendicular to the length direction of the corrugated pipe (7). The connecting pipe (12) passes through the corrugated pipe (7) and passes through the fixing plate (71) and is welded and fixed. The corrugated pipe (7) and the fixing plate (71) are both inside the exhaust shell (2).

7. The built-in evaporator in a large flue according to claim 1, characterized in that: The sealing box (11) has a U-shaped groove (111) on the outer side wall along the circumference of one end near the shell (1), and the U-shaped groove (111) is connected end to end.

8. The large flue-mounted evaporator according to claim 3, characterized in that: A buffer plate (13) is provided on the side of the second fan blade (53) away from the second support plate (5). The buffer plate (13) is parallel to the second support plate (5). The side of the buffer plate (13) facing the second rotating rod (52) is fixedly connected to the second rotating rod (52).

9. The built-in evaporator in a large flue according to claim 1, characterized in that: The exhaust housing (2) is provided with a sealing cover (8) at the end away from the first pipe (31), and a moving component (9) is provided at the exhaust housing (2) to drive the sealing cover (8) to move.

10. A built-in evaporator in a large flue according to claim 9, characterized in that: The exhaust casing (2) is fixedly connected to the outer walls of the opposite sides by a first connecting plate (26). The first connecting plate (26) and the sealing cover (8) are parallel. The moving component (9) includes a second connecting plate (91) and a lead screw (92). There are two second connecting plates (91) and two lead screws (92) that correspond to each other. The two second connecting plates (91) and the outer walls of the sealing cover (8) are fixedly connected to the opposite sides. The second connecting plate (91) and the first connecting plate (26) are parallel. The lead screw (92) is located on the side of the first connecting plate (26) away from the second connecting plate (91). The length direction of the lead screw (92) is perpendicular to the first connecting plate (26). The end of the lead screw (92) near the first connecting plate (26) passes through the first connecting plate (26) and the second connecting plate (91). The lead screw (92) and the first connecting plate (26) are rotatably connected. The lead screw (92) and the second connecting plate (91) are threadedly connected.

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