A steel chimney

Abstract

The utility model discloses a steel chimney, including outer tube and inner tube, the outer tube with the inner tube is connected through first connecting plate and second connecting plate, first connecting plate with the outer tube welding fixed, one end of second connecting plate with the inner tube welding fixed, the other end with first connecting plate welding fixed, have a plurality of spliced weld and a plurality of interval arrangement's stress expansion slot on the inner tube, stress expansion slot is located between two first connecting plate or two second connecting plate of adjacent. The steel chimney of the utility model reduces the cracking risk of weld effectively, and the structure is relatively simple.

Description

Technical Field

[0001] This utility model relates to the field of steel chimney technology, and specifically to a steel chimney. Background Technology

[0002] Currently, most steel chimney structures are in the form of a sleeve, which includes an outer sleeve and an inner sleeve. The outer sleeve serves to bear the load, while the inner sleeve serves to exhaust the flue gas. The inner sleeve can expand and contract freely when heated. However, when the flue gas temperature is very high, a large temperature stress will be generated within the temperature unit. Under the combined action of this stress and the residual stress from welding, there is a risk of cracking in the welds on the inner sleeve.

[0003] To address this issue, existing solutions involve welding outer connecting angle steel to the outer cylinder wall and inner connecting angle steel frames to the inner cylinder. The outer and inner connecting angle steel frames are connected by connectors. The outer connecting angle steel has oblong holes, and the inner connecting angle steel frames have connecting holes. Connectors are inserted into the connecting holes and oblong holes. When the flue gas temperature is high, the inner cylinder deforms due to heat, allowing the connectors to move relative to each other within the oblong holes, thus releasing the thermal stress on the inner cylinder and effectively reducing the risk of weld cracking. However, this solution requires high precision in machining the oblong holes and has a relatively complex structure. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a steel chimney that effectively reduces the risk of cracking at the weld while having a relatively simple structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A steel chimney includes an outer cylinder and an inner cylinder, which are connected by a first connecting plate and a second connecting plate. The first connecting plate is welded to the outer cylinder, and one end of the second connecting plate is welded to the inner cylinder and the other end is welded to the first connecting plate. The inner cylinder has multiple splicing welds and multiple spaced stress expansion grooves, which are located between two adjacent first connecting plates or two adjacent second connecting plates.

[0007] In a preferred embodiment, the outer cylinder includes an outer upper cylinder and an outer lower cylinder arranged adjacent to each other, the outer upper cylinder and the outer lower cylinder being connected by a flange assembly; the inner cylinder includes an inner upper cylinder and an inner lower cylinder, the inner upper cylinder and the inner lower cylinder being connected by a connecting assembly.

[0008] In a preferred embodiment, the connecting assembly and the flange assembly are independently arranged. The connecting assembly includes an upper connecting member disposed on the inner upper cylinder and a lower connecting member disposed on the inner lower cylinder. The upper connecting member is welded to the inner upper cylinder, and the lower connecting member is welded to the inner lower cylinder. Glass fiber yarn is provided between the upper connecting member and the lower connecting member.

[0009] In a preferred embodiment, the upper connector has a groove, the lower connector has a protrusion inserted into the groove, and the glass fiber yarn fills the gap between the groove and the protrusion.

[0010] In a preferred embodiment, the connecting assembly includes an upper connecting member disposed on the upper inner cylinder and a lower connecting member disposed on the lower inner cylinder, one end of the upper connecting member and the lower connecting member being welded and fixed to the flange assembly, respectively.

[0011] In a preferred embodiment, the other end of the upper connector is welded and fixed to the inner upper cylinder, and the other end of the lower connector is welded and fixed to the inner lower cylinder, with the upper connector and the lower connector abutting against each other. The upper connector and the lower connector have simple structures and relatively mature manufacturing processes.

[0012] In a preferred embodiment, the upper inner cylinder and / or the lower inner cylinder each have a plurality of splicing welds, the splicing welds being located in the middle of the second connecting plate.

[0013] In a preferred embodiment, the opening diameter of the inner cylinder is greater than 2m, and the thickness of the inner cylinder is 2-3mm. The thinner inner cylinder reduces manufacturing costs.

[0014] In a preferred embodiment, the inner cylinder is made of titanium, the second connecting plate is a titanium composite plate, the titanium layer of the titanium composite plate faces the inner cylinder, and the carbon steel layer of the titanium composite plate faces the first connecting plate; or, the inner cylinder and the second connecting plate are made of stainless steel, and the first connecting plate is made of carbon steel.

[0015] In a preferred embodiment, thermal insulation cotton is provided between the outer cylinder and the inner cylinder.

[0016] The present invention adopts the above solution and has the following advantages compared with the prior art:

[0017] The steel chimney of this utility model has an outer cylinder and an inner cylinder connected by a first connecting plate and a second connecting plate. Compared with a structure in which the outer cylinder and inner cylinder are set independently, the inner cylinder of this steel chimney can be made of a thinner metal plate, saving manufacturing costs. When the flue gas temperature inside the inner cylinder is too high, the stress expansion groove on the inner cylinder deforms and releases the temperature stress, effectively reducing the risk of cracking of the splicing weld on the inner cylinder. The stress expansion groove structure is simple and relatively easy to manufacture. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a steel chimney according to an embodiment of the present utility model;

[0020] Figure 2 This is a partial schematic diagram of a steel chimney according to Embodiment 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the connection between two adjacent steel chimney sections according to Embodiment 1 of this utility model;

[0022] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the connection between two adjacent steel chimney sections according to Embodiment 2 of this utility model.

[0024] in,

[0025] 1. Outer cylinder; 11. Upper outer cylinder; 12. Lower outer cylinder; 13. Flange assembly;

[0026] 2. Inner cylinder; 21. Stress expansion groove; 22. Upper inner cylinder; 23. Lower inner cylinder;

[0027] 3. First connecting plate; 4. Second connecting plate;

[0028] 5. Connecting components; 51. Upper connector; 511. Groove; 52. Lower connector; 521. Protrusion; 53. Fiberglass yarn; 6. Thermal insulation cotton. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] Reference Figures 1 to 4 As shown, this embodiment provides a steel chimney, including an outer cylinder 1 and an inner cylinder 2. Insulation cotton 6 is provided between the outer cylinder 1 and the inner cylinder 2, and the insulation cotton 6 plays the role of heat preservation.

[0032] Furthermore, referring to Figure 2 As shown, the outer cylinder 1 and the inner cylinder 2 are connected by a first connecting plate 3 and a second connecting plate 4. The first connecting plate 3 is welded to the outer cylinder 1, and one end of the second connecting plate 4 is welded to the inner cylinder 2, while the other end is welded to the first connecting plate 3. Furthermore, in one embodiment, the inner cylinder 2 is made of titanium, and the second connecting plate 4 is a titanium composite plate, with the titanium layer of the titanium composite plate facing the inner cylinder 2 and the carbon steel layer of the titanium composite plate facing the first connecting plate 3. In another embodiment, the inner cylinder 2 and the second connecting plate 4 are made of stainless steel, and the first connecting plate 3 is made of carbon steel.

[0033] Since the outer cylinder 1 and the inner cylinder 2 are connected by the first connecting plate 3 and the second connecting plate 4, instead of the separate outer cylinder and inner cylinder in the prior art, the thickness of the inner cylinder is thinner. Specifically, in this embodiment, the opening diameter of the inner cylinder 2 is greater than 2m and the thickness is 2-3mm, which can effectively reduce production costs and improve product competitiveness.

[0034] The inner cylinder 2 has multiple splicing welds and multiple spaced stress expansion grooves 21. More specifically, the inner upper cylinder 22 and the inner lower cylinder 23 both have multiple splicing welds. Taking the inner upper cylinder 22 as an example, the inner upper cylinder 22 is divided into multiple splicing sections, and there is a splicing weld between every two splicing sections. During operation, the two splicing sections are aligned and circumferentially butted together. The splicing weld is specifically located in the middle of the second connecting plate 4.

[0035] The stress expansion groove 21 is part of the inner cylinder 2, forming a groove by bending outward from the main body of the inner cylinder 2. The stress expansion groove 21 is located between two adjacent first connecting plates 3 or two adjacent second connecting plates 4. One or more stress expansion grooves 21 can be provided between two adjacent first connecting plates 3 or two adjacent second connecting plates 4, and the number is not limited in this embodiment. When the inner cylinder 2 is heated, the temperature stress can be released through the deformation of the stress expansion groove 21, effectively reducing the risk of cracking at the splicing weld. The stress expansion groove 21 has a relatively simple structure and a mature manufacturing process, which improves the market competitiveness of this chimney product.

[0036] Reference Figure 3 and Figure 4 As shown, the outer cylinder 1 includes an outer upper cylinder 11 and an outer lower cylinder 12 arranged adjacent to each other, and the outer upper cylinder 11 and the outer lower cylinder 12 are connected by a flange assembly 13; the inner cylinder 2 includes an inner upper cylinder 22 and an inner lower cylinder 23, and the inner upper cylinder 22 and the inner lower cylinder 23 are connected by a connecting assembly 5.

[0037] Furthermore, in this embodiment, the connecting assembly 5 and the flange assembly 13 are independently configured. The flange assembly includes two flanges, a gasket, and bolts. During installation, the bolt holes of the two flanges are aligned, the selected gasket is placed between the sealing surfaces of the two flanges, the bolts are inserted, and the nuts are manually tightened. The connecting assembly 5 and the stress expansion groove 21 are configured in the vertical direction. The connecting assembly 5 includes an upper connecting member 51 disposed on the inner upper cylinder 22 and a lower connecting member 52 disposed on the inner lower cylinder 23. Fiberglass yarn 53 is provided between the upper connecting member 51 and the lower connecting member 52. The upper connecting member 51 is welded to the inner upper cylinder 22, and the lower connecting member 52 is welded to the inner lower cylinder 23.

[0038] Specifically, refer to Figure 4 As shown, the upper connector 51 has a groove 511, and the lower connector 52 has a protrusion 521 that inserts into the groove 511. Fiberglass yarn 53 fills the gap between the groove 511 and the protrusion 521 to press and seal the upper connector 51 and the lower connector 52, preventing the leakage of toxic gases. This embodiment can achieve a sealing effect while also effectively eliminating temperature stress, especially when the stress expansion groove 21 is insufficient to withstand temperature stress, thus playing a certain auxiliary role.

[0039] In this embodiment, the outer cylinder 1 and inner cylinder 2 of the steel chimney are connected by the first connecting plate 3 and the second connecting plate 4. Compared with the structure in which the outer cylinder 1 and inner cylinder 2 are set independently, the inner cylinder 2 of the steel chimney can be made of a thinner metal plate, which saves manufacturing costs. When the flue gas temperature inside the inner cylinder is too high, the temperature stress can be released by the deformation of the stress expansion groove 21 on the inner cylinder 2, and the temperature stress can also be released by the expansion and contraction between the upper connecting piece 51 and the lower connecting piece 52, which effectively avoids cracking of the splicing weld.

[0040] Example 2

[0041] This embodiment is basically the same as Embodiment 1, except that, referring to... Figure 5 As shown, the connecting assembly 5 includes an upper connecting member 51 disposed on the inner upper cylinder 22 and a lower connecting member 52 disposed on the inner lower cylinder 23. Both the upper connecting member 51 and the lower connecting member 52 are flat and are inserted into the gap of the flange assembly 13, which refers to the clearance between the two flanges. One end of the upper connecting member 51 and the lower connecting member 52 are welded to the two flanges of the flange assembly, respectively. The other end of the upper connecting member 51 is welded to the inner upper cylinder 22, and the other end of the lower connecting member 52 is welded to the inner lower cylinder 23. During installation, after welding one end of both the upper connecting member 51 and the lower connecting member 52 to the flange assembly 13, bolts and nuts are used to secure the flanges, with the upper connecting member 51 and the lower connecting member 52 abutting against each other. This embodiment of the connecting assembly has a simpler structure, is easier to construct, and provides a better sealing effect.

[0042] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0043] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this utility model are only relative to the relative positional relationships of the various components of this utility model in the accompanying drawings.

[0044] The above embodiments are only for illustrating the technical concept and features of this utility model, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly, and should not be construed as limiting the protection scope of this utility model. All equivalent transformations or modifications made based on the principles of this utility model should be covered within the protection scope of this utility model.

Claims

1. A steel chimney, comprising an outer cylinder and an inner cylinder, characterized in that, The outer cylinder and the inner cylinder are connected by a first connecting plate and a second connecting plate. The first connecting plate is welded to the outer cylinder, and one end of the second connecting plate is welded to the inner cylinder and the other end is welded to the first connecting plate. The inner cylinder has multiple splicing welds and multiple spaced stress expansion grooves. The stress expansion grooves are located between two adjacent first connecting plates or two adjacent second connecting plates.

2. The steel chimney according to claim 1, characterized in that, The outer cylinder includes an upper outer cylinder and a lower outer cylinder arranged adjacent to each other, and the upper outer cylinder and the lower outer cylinder are connected by a flange assembly; the inner cylinder includes an upper inner cylinder and an lower inner cylinder, and the upper inner cylinder and the lower inner cylinder are connected by a connecting assembly.

3. The steel chimney according to claim 2, characterized in that, The connecting assembly and the flange assembly are independently configured. The connecting assembly includes an upper connecting member disposed on the inner upper cylinder and a lower connecting member disposed on the inner lower cylinder. The upper connecting member is welded to the inner upper cylinder, and the lower connecting member is welded to the inner lower cylinder. Glass fiber yarn is provided between the upper connecting member and the lower connecting member.

4. The steel chimney according to claim 3, characterized in that, The upper connector has a groove, the lower connector has a protrusion that inserts into the groove, and the glass fiber yarn fills the gap between the groove and the protrusion.

5. The steel chimney according to claim 2, characterized in that, The connecting assembly includes an upper connecting member disposed on the inner upper cylinder and a lower connecting member disposed on the inner lower cylinder, with one end of the upper connecting member and the lower connecting member respectively welded and fixed to the flange assembly.

6. The steel chimney according to claim 5, characterized in that, The other end of the upper connector is welded and fixed to the inner upper cylinder, and the other end of the lower connector is welded and fixed to the inner lower cylinder. The upper connector and the lower connector abut against each other.

7. The steel chimney according to claim 4 or 6, characterized in that, The upper inner cylinder and / or the lower inner cylinder each have multiple splicing welds, and the splicing welds are located in the middle of the second connecting plate.

8. The steel chimney according to claim 1, characterized in that, The inner cylinder has an opening diameter greater than 2m and a thickness of 2-3mm.

9. The steel chimney according to claim 8, characterized in that, The inner cylinder is made of titanium, and the second connecting plate is a titanium composite plate, with the titanium layer of the titanium composite plate facing the inner cylinder and the carbon steel layer of the titanium composite plate facing the first connecting plate; or, the inner cylinder and the second connecting plate are made of stainless steel, and the first connecting plate is made of carbon steel.

10. The steel chimney according to claim 1, characterized in that, Insulating cotton is provided between the outer cylinder and the inner cylinder.

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