Self-compensation grading air elbow

Abstract

The invention provides a self-compensating graded air elbow, and relates to the technical field of boiler sealing structures, the self-compensating graded air elbow comprises a water cooling wall, a connector is arranged on the water cooling wall, a graded air pipe is fixedly connected to the connector, a sealing housing is arranged at the position, arranged on the outer side of the graded air pipe in a sleeving mode, of the connector, and an expansion sealing box is fixedly arranged outside the sealing housing. The expansion joint is additionally arranged on the outer side of the fan air sealing cover shell, so that the expansion absorption capacity is enhanced, and the problem of welding seam cracking of the outer protection plate of the graded air elbow is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler sealing structures, and particularly relates to a self-compensating stepped air duct elbow. Background Art

[0002] The stepped air duct belongs to the air box system and has an expansion difference with the water wall system. Especially during the startup stage of the unit, the expansion difference caused by the temperature difference induces expansion stress at the weld of the outer guard plate of the fan air duct elbow. Under the action of long-term alternating stress, the weld cracks. Moreover, the stepped air duct is relatively close to the water wall and has only one elbow, so its ability to absorb expansion is weak. Therefore, there is a problem of cracking at the weld of the outer guard plate of the stepped air duct elbow. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0004] To achieve the above object, the present invention provides a self-compensating stepped air duct elbow, including a water wall, an interface is arranged on the water wall, a stepped air duct is fixedly connected to the interface, a sealing cover is sleeved outside the stepped air duct at the interface, and an expansion sealing box is fixedly arranged outside the sealing cover.

[0005] By adding an expansion joint outside the fan air seal cover of the present invention, the ability to absorb expansion difference is enhanced, and the problem of cracking at the weld of the outer guard plate of the stepped air duct elbow is solved.

[0006] Optionally, the sealing cover is welded to the interface.

[0007] Further, the sealing cover is fully welded to the expansion sealing box.

[0008] Further, the stepped air duct is fully welded to the expansion sealing box.

[0009] Further, the expansion sealing box is arranged as an expansion joint.

[0010] Further, the included angle between the axis of the connecting elbow of the stepped air duct and the water wall and the axis of the interface is set to be not greater than 10°.

[0011] Further, the stepped air duct includes a main body portion arranged parallel to the water wall and a corner portion fixedly connected to the interface, and the distance between the axis of the main body portion and the water wall is set to be not less than 800 mm.

[0012] Further, the expansion sealing box includes an expansion section, and a fixed section is integrally arranged at one end of the expansion section facing the stepped air duct, and the diameter of the fixed section is larger than the diameter of the expansion section.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0014] The above-mentioned and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the drawings, in which:

[0015] Figure 1 It is a schematic diagram of the overall structure of a self-compensating hierarchical air duct elbow according to the present invention.

[0016] Description of the reference numerals in the drawings:

[0017] 1. Water-cooled wall; 2. Interface; 3. Hierarchical air duct; 31. Main body part; 32. Corner part; 4. Sealing cover shell; 5. Expansion sealing box; 51. Expansion section; 52. Fixed section. Detailed Embodiments

[0018] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0019] The present application provides a self-compensating hierarchical air duct elbow, which will be described in detail below with reference to Figure 1 as follows.

[0020] A self-compensating hierarchical air duct elbow includes a water-cooled wall 1, an interface 2 is provided on the water-cooled wall 1, a hierarchical air duct 3 is fixedly connected to the interface 2, a sealing cover shell 4 is sleeved outside the hierarchical air duct 3 at the interface 2, and the sealing cover shell 4 is movably connected or detachably fixedly connected to the hierarchical air duct 3 to provide a telescopic space for the expansion stress to be conducted to the hierarchical air duct 3, and an expansion sealing box 5 is fixedly provided outside the sealing cover shell 4.

[0021] By adding an expansion joint outside the air seal cover shell 4 of the fan in the present invention, the ability to absorb expansion difference is enhanced, and the problem of weld cracking of the outer guard plate of the hierarchical air duct elbow is solved.

[0022] In some embodiments, the sealing cover shell 4 is welded to the interface 2. The welded sealing cover shell 4 can improve the sealing performance of the sealing cover shell 4.

[0023] In some embodiments, the sealing cover shell 4 is fully welded to the expansion sealing box 5. The full welding setting can maximize the sealing performance of the sealing cover shell 4 and the expansion sealing box 5, and prevent the gas in the pipeline from flowing out through the gap between the sealing cover shell 4 and the expansion sealing box 5.

[0024] In some embodiments, the classified air duct 3 and the expansion seal box 5 are full-welded. The full-welded setting can maximize the sealing performance between the classified air duct 3 and the expansion seal box 5, preventing the gas in the pipeline from flowing out through the gap between the classified air duct 3 and the expansion seal box 5.

[0025] In some embodiments, the expansion seal box 5 is provided as an expansion joint. The setting of the expansion joint can effectively absorb the expansion stress caused by the temperature difference at the interface 2 at the elbow of the classified air duct 3, thereby completing the absorption of the expansion stress while ensuring the seal.

[0026] In some embodiments, the included angle between the axis of the connection elbow of the classified air duct 3 and the water-cooled wall 1 and the axis of the interface 2 is set to be not greater than 10°. By changing the original design included angle of 35° to not exceeding 10°, preferably 10°, the flame center can move upward, reducing the direct contact between the flame and the connection position of the elbow and the interface 2, and reducing the temperature difference change at the elbow and the interface 2, thereby further reducing the expansion stress caused by the temperature difference at the interface 2.

[0027] In some embodiments, the classified air duct 3 includes a main body portion 31 arranged parallel to the water-cooled wall 1 and a corner portion 32 fixedly connected to the interface 2. The distance between the axis of the main body portion 31 and the water-cooled wall 1 is set to be not less than 800 mm, preferably 800 mm. The setting of the distance between the axis of the main body portion 31 and the water-cooled wall 1 can provide sufficient adjustment space for the bending angle of the corner portion 32.

[0028] In some embodiments, the expansion seal box 5 includes an expansion section 51. At one end of the expansion section 51 facing the classified air duct 3, a fixed section 52 is integrally provided. The diameter of the fixed section 52 is set to be larger than the diameter of the expansion section 51. The setting of the fixed section 52 can provide a part for the seal box to be fixedly connected to the classified air duct 3. The classified air duct 3 and the fixed connection part can be directly welded by full welding, providing a larger welding area for the welding part, facilitating the welding operation, further improving the welding quality, and ensuring the sealing performance between the seal box and the classified air duct 3.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0031] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0033] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0034] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A self-compensating graded wind elbow, characterized in that: It comprises a water-cooled wall, the water-cooled wall is provided with an interface, the interface is fixedly connected with a graded air duct, the interface is sleeved with a sealing shell outside the graded air duct, and an expansion sealing box is fixedly provided outside the sealing shell.

2. A self-compensating graded wind elbow as claimed in claim 1, characterized in that: The sealing cover shell and the interface are welded.

3. A self-compensating graded wind elbow as claimed in claim 1, characterized in that: The sealing cover shell and the expansion sealing box are fully welded.

4. A self-compensating graded wind elbow as claimed in claim 3, characterized in that: The graded air duct and the expansion sealing box are fully welded.

5. A self-compensating graded wind elbow as described in any one of claims 3-4, characterized in that: The expansion sealing box is configured as an expansion joint.

6. A self-compensating graded wind elbow as claimed in claim 1, characterized in that: The angle between the axis of the elbow connecting the graded air duct and the water-cooled wall and the axis of the interface is not greater than 10°.

7. The self-compensating graded wind elbow according to claim 1, characterized in that: The graded air duct includes a main body portion arranged parallel to the water-cooled wall and a corner portion fixedly connected to the interface, and the distance between the axis of the main body portion and the water-cooled wall is not less than 800 mm.

8. The self-compensating graded wind elbow according to claim 5, characterized in that: The expansion sealing box includes an expansion section, and a fixed section is integrally provided at one end of the expansion section facing the graded air duct, and the diameter of the fixed section is larger than the diameter of the expansion section.

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