A steel chimney with adjustable smoke exhaust efficiency

Abstract

The present invention discloses a steel chimney with adjustable smoke exhaust efficiency, which relates to the technical field of steel chimneys and includes a draft fan arranged at the top of the steel chimney and an adjusting mechanism arranged below the draft fan. The adjusting mechanism includes a plurality of concentrically arranged rings with gradually increasing ring diameters. Each ring includes a plurality of sector-shaped plates. The sector-shaped plates in adjacent two rings are slidably connected in the radial direction. The sector-shaped plates in the ring with the largest ring diameter are connected to the top of the steel chimney. The present invention can adjust the smoke exhaust efficiency of the steel chimney even when the draft fan fails.

Description

Technical Field

[0001] The present invention relates to the technical field of steel chimneys, and specifically relates to a steel chimney with adjustable smoke exhaust efficiency. Background Art

[0002] Chimneys include reinforced concrete chimneys and steel chimneys. A reinforced concrete chimney refers to a chimney with a barrel wall made of reinforced concrete, and a steel chimney refers to a chimney with a barrel wall made of steel. Due to the shorter construction period and lower construction cost of steel chimneys, the application of steel chimneys is becoming more and more widespread.

[0003] In order to improve the smoke exhaust efficiency of steel chimneys, a draft fan is usually installed at the top of the steel chimney. However, when the draft fan fails, the smoke exhaust efficiency of the steel chimney cannot be adjusted.

[0004] Therefore, how to adjust the smoke exhaust efficiency of a steel chimney when the draft fan fails is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] Aiming at the above-mentioned deficiencies existing in the prior art, the present invention provides a steel chimney with adjustable smoke exhaust efficiency, which can adjust the smoke exhaust efficiency of the steel chimney even when the draft fan fails.

[0006] To achieve the above object, the invention provides the following technical solutions:

[0007] A steel chimney with adjustable smoke exhaust efficiency includes a draft fan arranged at the top of the steel chimney and an adjustment mechanism arranged below the draft fan. The adjustment mechanism includes a plurality of concentrically arranged rings with gradually increasing ring diameters. Each ring includes a plurality of fan-shaped plates. The fan-shaped plates in adjacent two rings are slidably connected in the radial direction, and the fan-shaped plates in the ring with the largest ring diameter are connected to the top of the steel chimney.

[0008] Further, among adjacent two rings, the fan-shaped plates in the ring with the larger ring diameter are provided with slide rails, and the fan-shaped plates in the ring with the smaller ring diameter are provided with chutes, and the slide rails are slidably matched with the chutes. <U+

[0009] [[ID=U+0000031]]Further, handles are provided on the outer circles of the fan-shaped plates.

[0010] Further, a support rod is provided at the top of the steel chimney, a rain cap is provided at the top of the support rod, and the draft fan is arranged inside the rain cap.

[0011] Further, the fan-shaped plates in adjacent two rings are connected by fasteners.

[0012] Further, the annular body is arranged in a conical cylinder shape. A connecting rod is rotatably connected to the fan-shaped plate in the annular body with the smallest ring diameter. The upper end of the connecting rod is rotatably connected to the upper end of the support rod, and the support rod is vertically slidably connected to the top of the steel chimney.

[0013] Further, a sliding cylinder is provided at the top of the steel chimney. The support rod is arranged in the sliding cylinder, and the support rod is vertically slidably matched with the sliding cylinder.

[0014] Further, a limiting plate is provided on the outer wall of the steel chimney, and the limiting plate is arranged below the sliding cylinder.

[0015] Compared with the prior art, the beneficial effects of the invention are as follows:

[0016] 1. In the steel chimney provided by the present invention, when pushing the fan-shaped plate in the annular body with a smaller ring diameter towards the center of the smoke exhaust opening at the top of the steel chimney, the annular body with a smaller ring diameter can be used to block the smoke exhaust opening at the top of the steel chimney, so as to reduce the diameter of the smoke exhaust opening at the top of the steel chimney and improve the smoke exhaust efficiency; when pushing the fan-shaped plate in the annular body away from the center of the smoke exhaust opening at the top of the steel chimney, the annular body with a larger ring diameter can be used to block the smoke exhaust opening at the top of the steel chimney, so as to increase the diameter of the smoke exhaust opening at the top of the steel chimney and reduce the smoke exhaust efficiency. All in all, when the induced draft fan at the top of the steel chimney fails, the steel chimney provided by the present invention can still adjust the smoke exhaust efficiency, which is beneficial to improving the use flexibility.

[0017] 2. In the steel chimney provided by the present invention, the adjusting mechanism for adjusting the smoke exhaust efficiency is a pure mechanical structure, which is convenient for overhaul and maintenance and is beneficial to improving the efficiency of overhaul and maintenance.

[0018] 3. Unexpectedly, in the steel chimney provided by the present invention, when pushing the fan-shaped plate in the annular body with a smaller ring diameter towards the center of the smoke exhaust opening at the top of the steel chimney, the annular body with a smaller ring diameter can be used to block the smoke exhaust opening at the top of the steel chimney, which can not only improve the smoke exhaust efficiency but also reduce the probability of rain and snow entering the smoke exhaust opening, improving the rain and snow prevention effect of the steel chimney of the present invention.

[0019] 4. The present invention uses fasteners to fix the fan-shaped plates in two adjacent annular bodies together, which is beneficial to improving the operation stability of the steel chimney of the present invention.

[0020] 5. In the steel chimney provided by the present invention, by arranging the annular body in a conical cylinder shape, not only can the smoke exhaust efficiency be improved by increasing the smoke flow velocity at the smoke exhaust opening at the top of the steel chimney, but also the suction force of the steel chimney can be increased by increasing the height of the steel chimney, which is more beneficial to improving the smoke exhaust efficiency.

[0021] 6. In the steel chimney provided by the present invention, since the fan-shaped plate in the ring body with the smallest ring diameter is connected to the support rod through the connecting rod, when the height of the fan-shaped plate in the ring body with the smallest ring diameter increases, the height of the support rod, the rain cap on the support rod, and the induced draft fan also increases accordingly, so as to maintain the distance between the ring body with the smallest ring diameter and the induced draft fan and prevent the induced draft fan and the rain cap from obstructing the outflow of flue gas.

[0022] 7. Unexpectedly, after increasing the height of the steel chimney, because the ring body forms a conical structure, it is more convenient for rain and snow to flow down along the outer surface of the ring body, reducing the probability of rain and snow entering the interior of the steel chimney and further improving the rain and snow prevention effect of the steel chimney.

[0023] 8. In the steel chimney provided by the present invention, by installing a limiting plate on the outer wall of the steel chimney, when the connecting rod breaks, the support rod can be supported by the limiting plate, thereby preventing the support rod, the rain cap, and the induced draft fan from falling, and preventing the top of the ring body and the steel chimney from being damaged by the induced draft fan and the rain cap, improving the protection effect of the steel chimney of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Structural schematic diagram of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 1 Figure 1 ;

[0025] Figure 2 Structural schematic diagram of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 1 Figure 2 ;

[0026] Figure 3 Structural schematic diagram of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 1 Figure 3 ;

[0027] Figure 4 Structural schematic diagram of the adjustment mechanism installed on the top of the steel chimney in Embodiment 1;

[0028] Figure 5 For Figure 4 Partial enlarged view at A in

[0029] Figure 6 State of the adjustment mechanism in Embodiment 1 Figure 1 ;

[0030] Figure 7 State of the adjustment mechanism in Embodiment 1 Figure 2 ;

[0031] Figure 8 State of the adjustment mechanism in Embodiment 1 Figure 3 ;

[0032] Figure 9Schematic diagram of the structure of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 2;

[0033] Figure 10 Schematic diagram of the structure of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 3 Figure 1 ;

[0034] Figure 11 Schematic diagram of the structure of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 3 Figure 2 ;

[0035] Figure 12 Schematic diagram of the structure of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 4 Figure 1 ;

[0036] Figure 13 Schematic diagram of the structure of a steel chimney with adjustable smoke exhaust efficiency in Embodiment 4 Figure 2 .

[0037] In the figure:

[0038] 1 - Steel chimney, 11 - Sliding cylinder,

[0039] 2 - Support rod,

[0040] 3 - Rainproof cap,

[0041] 4 - Induced draft fan,

[0042] 51 - Ring body, 511 - Sector - shaped plate, 512 - Slide rail, 513 - Slide groove, 514 - Fastener, 515 - Connecting rod, 516 - Handle,

[0043] 6 - Limiting plate. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment 1:

[0046] As Figure 1-8 shown, a steel chimney with adjustable smoke exhaust efficiency includes an induced draft fan 4 and an adjustment mechanism.

[0047] As Figure 1-3As shown in the figure, the induced draft fan 4 is installed on the top of the steel chimney 1. Specifically, a support rod 2 is installed on the top of the steel chimney 1, a rain cap 3 is installed on the top of the support rod 2, and the induced draft fan 4 is installed inside the rain cap 3. After the induced draft fan 4 is started, it can help the flue gas inside the steel chimney 1 to be discharged outwards.

[0048] As Figure 1-4 shown in the figure, the adjusting mechanism is arranged below the induced draft fan 4. The adjusting mechanism includes a plurality of annular bodies 51 that are concentrically arranged and have gradually increasing ring diameters. For example, in this embodiment, there are three annular bodies 51, which are respectively denoted as annular body 51a, annular body 51b, and annular body 51c. The annular body 51a, annular body 51b, and annular body 51c are concentrically arranged. The ring diameter refers to the inner diameter and outer diameter of the annular body 51. The inner diameter of the annular body 51a < the inner diameter of the annular body 51b < the inner diameter of the annular body 51c, and the outer diameter of the annular body 51a < the outer diameter of the annular body 51b < the outer diameter of the annular body 51c.

[0049] As Figure 1-4 shown in the figure, the sector-shaped plate 511 in the annular body 51 with the largest ring diameter (i.e., the annular body 51c) is installed on the top of the steel chimney 1.

[0050] As Figure 4 and Figure 5 shown in the figure, the annular body 51 includes a plurality of sector-shaped plates 511. For example, in this embodiment, the annular body 51 includes four sector-shaped plates 511. The sector-shaped plates 511 in adjacent two annular bodies 51 are slidably connected in the radial direction. Specifically, among adjacent two annular bodies 51, slide rails 512 are installed on the upper end surfaces of all the sector-shaped plates 511 in the annular body 51 with a larger ring diameter, and sliding grooves 513 are provided on the lower end surfaces of all the sector-shaped plates 511 in the annular body 51 with a smaller ring diameter. The slide rails 512 are slidably matched with the sliding grooves 513 along the radial direction.

[0051] The smaller the diameter of the smoke exhaust port at the top of the steel chimney 1, the faster the flow velocity of the flue gas with the same flow rate passing through the port per unit time, and the higher the smoke exhaust efficiency can be improved.

[0052] As Figure 6 shown in the figure, the first state of the adjusting mechanism is that the sector-shaped plates 511 in the annular body 51a, annular body 51b, and annular body 51c are all combined into a complete ring, and the diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51a.

[0053] As Figure 7 shown in the figure, the second state of the adjusting mechanism is that the sector-shaped plates 511 in the annular body 51a are located on the sector-shaped plates 511 in the annular body 51b, and the sector-shaped plates 511 in the annular body 51b and annular body 51c are combined into a complete ring, and the diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51b.

[0054] As Figure 8As shown in the figure, the third state of the adjusting mechanism: the sector-shaped plate 511 in the annular body 51a is located on the sector-shaped plate 511 in the annular body 51b, the sector-shaped plate 511 in the annular body 51b is located on the sector-shaped plate 511 in the annular body 51c, and the sector-shaped plates 511 in the annular body 51c are joined together to form a complete ring. The diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51c.

[0055] Among the above three states of the adjusting mechanism, when the adjusting mechanism is in the first state, the diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51a. Also, because the inner diameter of the annular body 51a < the inner diameter of the annular body 51b < the inner diameter of the annular body 51c, when the adjusting mechanism is in the first state, the smoke flow velocity through the smoke exhaust port at the top of the steel chimney 1 is the fastest, and the smoke exhaust efficiency is the highest. When the adjusting mechanism is in the third state, the diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51c. Similarly, because the inner diameter of the annular body 51a < the inner diameter of the annular body 51b < the inner diameter of the annular body 51c, when the adjusting mechanism is in the third state, the smoke flow velocity through the smoke exhaust port at the top of the steel chimney 1 is the slowest, and the smoke exhaust efficiency is the lowest.

[0056] When it is necessary to improve the smoke exhaust efficiency, it is necessary to reduce the diameter of the smoke exhaust port at the top of the steel chimney 1. The specific operation is as follows: The worker pushes the sector-shaped plate 511 in the annular body 51b towards the center of the smoke exhaust port at the top of the steel chimney 1, so that the diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51b, that is, the adjusting mechanism is adjusted from the third state to the second state. If you want to further improve the smoke exhaust efficiency, you need to continue to push the sector-shaped plate 511 in the annular body 51a towards the center of the smoke exhaust port at the top of the steel chimney 1. At this time, the diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51a, that is, the adjusting mechanism is adjusted from the second state to the first state.

[0057] When it is necessary to reduce the smoke exhaust efficiency, it is necessary to increase the diameter of the smoke exhaust port at the top of the steel chimney 1. The specific operation is as follows: The worker pushes the sector-shaped plate 511 in the annular body 51a in the direction away from the center of the smoke exhaust port at the top of the steel chimney 1, so that the sector-shaped plate 511 in the annular body 51a slides onto the sector-shaped plate 511 in the annular body 51b, and the inner diameter of the annular body 51b becomes the diameter of the smoke exhaust port at the top of the steel chimney 1, that is, the adjusting mechanism is adjusted from the first state to the second state. If you want to further reduce the smoke exhaust efficiency, you need to continue to push the sector-shaped plate 511 in the annular body 51b in the direction away from the center of the smoke exhaust port, so that the sector-shaped plate 511 in the annular body 51b slides onto the sector-shaped plate 511 in the annular body 51c, and the inner diameter of the annular body 51c becomes the diameter of the smoke exhaust port at the top of the steel chimney 1, that is, the adjusting mechanism is adjusted from the second state to the third state.

[0058] As can be seen from the above process, when pushing the sector-shaped plate 511 in the ring body 51 with a smaller ring diameter towards the center of the smoke exhaust opening at the top of the steel chimney 1, the ring body 51 with a smaller ring diameter can be used to block the smoke exhaust opening at the top of the steel chimney 1, so as to reduce the diameter of the smoke exhaust opening at the top of the steel chimney 1 and improve the smoke exhaust efficiency; when pushing the sector-shaped plate 511 in the ring body 51 away from the center of the smoke exhaust opening at the top of the steel chimney 1, the ring body 51 with a larger ring diameter can be used to block the smoke exhaust opening at the top of the steel chimney 1, so as to increase the diameter of the smoke exhaust opening at the top of the steel chimney 1 and reduce the smoke exhaust efficiency. In short, when the induced draft fan 4 at the top of the steel chimney 1 fails, the steel chimney 1 provided in this embodiment can still adjust the smoke exhaust efficiency, which is beneficial to improving the use flexibility.

[0059] Furthermore, in the steel chimney 1 provided in this embodiment, the adjustment mechanism for adjusting the smoke exhaust efficiency is a pure mechanical structure, which is convenient for maintenance and is beneficial to improving the maintenance efficiency.

[0060] In addition, unexpectedly, when pushing the sector-shaped plate 511 in the ring body 51 with a smaller ring diameter towards the center of the smoke exhaust opening at the top of the steel chimney 1, the ring body 51 with a smaller ring diameter can be used to block the smoke exhaust opening at the top of the steel chimney 1, so that not only the smoke exhaust efficiency can be improved, but also the probability of rain and snow entering the smoke exhaust opening can be reduced, improving the rain and snow prevention effect of the steel chimney 1 in this embodiment.

[0061] Embodiment 2:

[0062] On the basis of Embodiment 1, this Embodiment 2 makes further improvements:

[0063] As Figure 9 shown, a handle 516 is installed on the outer circle of the sector-shaped plate 511 in the ring body 51a and the ring body 51b. The setting of the handle 516 can facilitate the worker to operate the sector-shaped plate 511 and more conveniently adjust the steel chimney in this embodiment.

[0064] Embodiment 3:

[0065] On the basis of Embodiment 1 or Embodiment 2, this Embodiment 3 makes further improvements:

[0066] As Figure 10-11 shown, Figure 10 the figure shows a schematic structural diagram of the improvement made on the basis of Embodiment 1, Figure 11 and the figure shows a schematic structural diagram of the improvement made on the basis of Embodiment 2. In order to maintain the three states of the adjustment mechanism in Embodiment 1, fasteners 514 such as screws or bolts can be used to fix the sector-shaped plates 511 in two adjacent ring bodies 51 together, so as to improve the stability. When it is necessary to adjust the position of the sector-shaped plate 511 in the ring body 51, the fastener 514 needs to be screwed off first.

[0067] Example 4:

[0068] On the basis of Example 3, Example 4 makes further improvements:

[0069] As Figure 12-13 shown, the annular body 51 is arranged in a conical cylinder shape. A connecting rod 515 is rotatably connected to the sector-shaped plate 511 in the annular body 51 with the smallest ring diameter (i.e., the annular body 51a). The upper end of the connecting rod 515 is rotatably connected to the upper end of the support rod 2. The support rod 2 is vertically slidably matched with a sliding cylinder 11 installed at the top of the steel chimney 1.

[0070] Because the annular body 51 is arranged in a conical cylinder shape, when adjusting the position of the annular body 51, the height of the annular body 51 can be changed, and thus the height of the steel chimney 1 can also be changed. Also, because the sector-shaped plate 511 in the annular body 51a is connected to the support rod 2 through the connecting rod 515, when the height of the annular body 51 changes, the height of the support rod 2, the rainproof cap 3, and the induced draft fan 4 can change adaptively.

[0071] As Figure 12-13 shown, the first state of the adjusting mechanism is: the sector-shaped plates 511 in the annular bodies 51a, 51b, and 51c are all joined together to form a complete conical cylinder shape. The diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51a, and moreover, the highest end of the steel chimney 1 is the height where the inner edge of the annular body 51a is located.

[0072] The second state of the adjusting mechanism is: the sector-shaped plate 511 in the annular body �1a is located on the sector-shaped plate 511 in the annular body 51b, and the sector-shaped plates 511 in the annular bodies 51b and 51c are joined together to form a complete conical cylinder shape. The diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51b, and moreover, the highest end of the steel chimney 1 is the height where the inner edge of the annular body 51b is located.

[0073] The third state of the adjusting mechanism: the sector-shaped plate 511 in the annular body 51a is located on the sector-shaped plate 511 in the annular body 51b, the sector-shaped plate 511 in the annular body 51b is located on the sector-shaped plate 511 in the annular body 51c, and the sector-shaped plates 511 in the annular body 51c are joined together to form a complete conical cylinder shape. The diameter of the smoke exhaust port at the top of the steel chimney 1 is the inner diameter of the annular body 51c, and moreover, the highest end of the steel chimney 1 is the height where the inner edge of the annular body 51c is located.

[0074] Because the inner diameter of the annular body 51a < the inner diameter of the annular body 51b < the inner diameter of the annular body 51c, when the sector-shaped plates 511 in the annular bodies 51a, 51b, and 51c are joined together to form a complete conical cylinder shape, the height of the inner edge of the annular body 51a > the height of the inner edge of the annular body 51b > the height of the inner edge of the annular body 51c > the original top height of the steel chimney 1.

[0075] Also, since the sector-shaped plate 511 in the ring body 51a is connected to the support rod 2 through the connecting rod 515, when the height of the sector-shaped plate 511 in the ring body 51a increases, the height of the support rod 2 and the rain cap 3 and the induced draft fan 4 on the support rod 2 also increases accordingly, so as to maintain the distance between the ring body 51a and the induced draft fan 4 and prevent the induced draft fan 4 and the rain cap 3 from obstructing the outflow of the flue gas.

[0076] When the induced draft fan 4 fails, in Embodiment 1, the flue gas flow rate at the smoke exhaust port at the top of the steel chimney 1 is increased to improve the smoke exhaust efficiency. In this Embodiment 5, not only that, but the draft of the steel chimney 1 can also be increased by increasing the height of the steel chimney 1. The chimney draft = chimney height × gas density difference inside and outside the chimney. The higher the height of the steel chimney 1, the more the draft of the steel chimney 1 can be increased, and thus the more beneficial it is to improve the smoke exhaust efficiency.

[0077] Unexpectedly, after increasing the height of the steel chimney 1, since the ring body 51 forms a conical structure, it is more convenient for rain and snow to flow down along the outer surface of the ring body 51, reducing the probability of rain and snow entering the interior of the steel chimney 1 and further improving the rain and snow prevention effect of the steel chimney 1.

[0078] Furthermore, when the connecting rod 515 breaks, in order to prevent the rain cap 3 and the induced draft fan 4 from falling and hitting the top of the ring body 51 and the steel chimney 1, a limiting plate 6 is installed on the outer wall of the steel chimney 1. The limiting plate 6 is arranged below the sliding cylinder 11. Thus, when the connecting rod 515 breaks, the support rod 2 can be supported by the limiting plate 6, preventing the support rod 2, the rain cap 3, and the induced draft fan 4 from falling, and preventing the top of the ring body 51 and the steel chimney 1 from being damaged by the induced draft fan 4 and the rain cap 3, thereby improving the protection effect on the steel chimney 1 of this embodiment.

[0079] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A steel chimney with adjustable smoke exhaust efficiency, including a draft fan arranged at the top of the steel chimney, characterized in that, A support rod is provided at the top of the steel chimney, and a rain cap is provided at the top of the support rod. The induced draft fan is arranged inside the rain cap. Further included is an adjusting mechanism arranged below the induced draft fan. The adjusting mechanism includes a plurality of concentrically arranged rings with gradually increasing ring diameters. The rings include a plurality of sector-shaped plates. The sector-shaped plates in adjacent two rings are slidably connected in the radial direction. The sector-shaped plate in the ring with the largest ring diameter is connected to the top of the steel chimney. Among adjacent two rings, the ring with a smaller ring diameter is located outside the ring with a larger ring diameter. The sector-shaped plates in adjacent two rings are connected by fasteners. The rings are arranged in a conical tube shape. A connecting rod is rotatably connected to the sector-shaped plate in the ring with the smallest ring diameter. The upper end of the connecting rod is rotatably connected to the upper end of the support rod. The support rod is vertically slidably connected to the top of the steel chimney.

2. The steel chimney with adjustable smoke exhaust efficiency according to claim 1, wherein, Among adjacent two rings, a slide rail is provided on the sector-shaped plate in the ring with a larger ring diameter, and a slide groove is provided on the sector-shaped plate in the ring with a smaller ring diameter. The slide rail is in sliding fit with the slide groove.

3. The steel chimney with adjustable smoke exhaust efficiency according to claim 1, wherein A handle is provided on the outer circle of the sector-shaped plate.

4. The steel chimney with adjustable smoke exhaust efficiency according to claim 1, wherein A sliding cylinder is provided at the top of the steel chimney, and the support rod is arranged inside the sliding cylinder. The support rod is vertically slidably matched with the sliding cylinder.

5. The steel chimney with adjustable smoke exhaust efficiency according to claim 4, characterized in that, A limiting plate is provided on the outer wall of the steel chimney, and the limiting plate is arranged below the sliding cylinder.

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