Inner sealing supporting structure at chimney flange joint

Abstract

The utility model provides an inner sealing supporting structure at the chimney flange connecting position, and belongs to the technical field of chimney installation. Comprising a plurality of pipe joints which are coaxially connected end to end, connecting flanges are coaxially and fixedly connected to the outer walls of the two ends of each pipe joint, the connecting flanges at the joints of the adjacent pipe joints are connected through flange bolts, corrosion-resistant layers are arranged on the inner walls of the pipe joints, and corrosion-resistant joint strip assemblies are arranged between the adjacent pipe joints. The anti-corrosion joint strip assembly comprises two corner joint rings made of the same material as the anti-corrosion layer, and the two corner joint rings between the adjacent connecting flanges are in close contact. The corner pasting rings made of the same material as the corrosion-resistant layers in the pipe joints are welded and connected to the corrosion-resistant layers on the inner walls of the pipe joints, when the two pipe joints are connected with each other, the corner pasting rings on the two pipe joints are tightly combined between the connecting flanges, smoke is prevented from flowing out, corrosion to carbon steel layers on the outer surfaces of the chimney pipe joints is reduced, and the service life of the chimney pipe joints is prolonged. The effect of prolonging the service life of the chimney is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chimney installation, in particular to an inner sealing support structure of a chimney flange connection. Background Art

[0002] A chimney is a structure that provides ventilation for hot flue gas or smoke from boilers, fireplaces, blast furnaces, etc. Chimneys are usually vertical to ensure smooth flow of gas. Small and medium-sized chimneys usually use composite steel plates bent into a cylindrical shape, and the connecting seams at both ends of the plate are welded to form a pipe section. Traditional chimneys are composed of multiple pipe sections connected together, and adjacent pipe sections need to be sealed to avoid chimney leakage.

[0003] The inner wall of a traditional chimney needs to be coaxially processed with a corrosion-resistant coating to prevent the carbon steel layer of the chimney body from contacting the flue gas and causing corrosion of the chimney. However, due to construction conditions, it is difficult to fully cover the joints of the various pipe sections of the chimney with a corrosion-resistant coating to seal the smoke inside the chimney. In addition, the chimney is prone to shaking when affected by multiple factors such as wind during use, which in turn causes gaps between the pipe sections. The smoke in the chimney will still corrode the carbon steel layer of the pipe sections. Utility Model Content

[0004] In view of the above problems, the utility model provides an internal sealing support structure of a chimney flange connection.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is as follows:

[0006] Provided is an internal sealing support structure at the chimney flange connection, comprising a plurality of pipe sections connected coaxially end to end, with connecting flanges coaxially fixedly connected to the outer walls of both ends of the pipe sections, the connecting flanges at the connection of adjacent pipe sections are connected by flange bolts, a corrosion-resistant layer is provided on the inner wall of the pipe section, and an anti-corrosion strip assembly is provided between adjacent pipe sections;

[0007] The anti-corrosion strip assembly includes two corner rings with L-shaped cross-sections. One end edge of the corner ring is coaxially welded and fixed to the inner wall of the corrosion-resistant layer, and the other end edge extends toward the connecting flange of the pipe segment. The two corner rings are respectively connected to two adjacent pipe segments. The corner rings are made of the same material as the corrosion-resistant layer, and the two corner rings between adjacent connecting flanges are in close contact.

[0008] Furthermore, the corner ring is welded and fixed at both ends after the angle steel bar is rolled into a circle.

[0009] Furthermore, a first annular groove is coaxially provided on the connecting flange at one end of the pipe segment, a first elastic protrusion is provided on the corner ring close to the first annular groove and protrudes into the first annular groove, and a first sealing ring is filled in the first annular groove.

[0010] Furthermore, a second annular groove is provided on the connecting flange at the other end of the pipe joint away from the first annular groove. The second annular groove is concentric with and staggered with the first annular groove. A second elastic protrusion is provided on the corner ring close to the second annular groove and protrudes into the second annular groove. A second sealing ring is filled in the second annular groove.

[0011] Furthermore, the corner rings at both ends of the pipe section are respectively provided with a first filling part and a second filling part adapted to the first elastic protrusion and the second elastic protrusion, and a third sealing ring is also filled and arranged between the first filling part, the first elastic protrusion and the second filling part, and the second elastic protrusion.

[0012] Furthermore, a fourth sealing ring is provided between the seams of two adjacent pipe sections, and the fourth sealing ring is located on the outside of the anti-corrosion strip assembly.

[0013] The beneficial effects of the utility model are as follows: by adopting a corner ring made of the same material as the internal corrosion-resistant layer of the pipe segment and welding it to the corrosion-resistant layer on the inner wall of the pipe segment, when two pipe segments are connected to each other, the corner rings on the two pipe segments are tightly combined between the connecting flanges to prevent smoke from flowing out, thereby reducing corrosion to the carbon steel layer on the surface of the chimney pipe segment and increasing the service life of the chimney. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the internal sealing support structure at the chimney flange connection of Example 1 of the present application.

[0015] Figure 2 This is a schematic structural diagram of the internal sealing support structure at the chimney flange connection of Example 2 of the present application.

[0016] Among them, 1. pipe joint; 11. connecting flange; 111. first ring groove; 112. second ring groove; 12. flange bolt; 2. corrosion-resistant layer; 3. corner ring; 31. first elastic protrusion; 32. second elastic protrusion; 33. first filling part; 34. second filling part; 4. fourth sealing ring. DETAILED DESCRIPTION

[0017] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Example 1

[0019] The present application embodiment discloses a chimney flange connection inner sealing support structure, referring to Figure 1, including a plurality of pipe segments 1 connected coaxially end to end, each pipe segment 1 having a corrosion-resistant layer 2 fixedly disposed on its inner wall, the corrosion-resistant layer 2 being made of corrosion-resistant material, such as stainless steel or titanium alloy, each pipe segment 1 having two ends coaxially welded and fixedly connected with a connecting flange 11, and the connecting flanges 11 at both ends of the pipe segment 1 having holes directly through them. After two root pipe segments 1 are butt-jointed, the holes on the connecting flanges 11 are aligned, and then a flange bolt 12 is passed through the two connecting flanges 11 and then threadedly connected with a flange nut, thereby connecting the two pipe segments 1 into one.

[0020] An anti-corrosion strip assembly is arranged between adjacent pipe sections 1. In the embodiment of the present application, the anti-corrosion strip assembly includes two corner rings 3 with L-shaped cross-sections. The corner rings 3 are rolled into a right-angle steel bar by a special rolling machine, and then the two ends of the angle steel bar are welded and fixed to form the corner rings 3. One end edge of the corner ring 3 is coaxially welded and fixed to the inner wall of the corrosion-resistant layer 2, and one end edge extends to the connecting flange 11 of the pipe section 1. The two corner rings 3 are respectively connected to the two adjacent pipe sections 1, and the corner rings 3 are made of the same material as the corrosion-resistant layer 2. When the two pipe sections 1 are connected as one, the two corner rings 3 between the adjacent connecting flanges 11 are in close contact. By using two corner rings 3 of the same material as the corrosion-resistant layer 2 to block the inner side of the joint of the two pipe sections 1, and sealingly connecting with the corrosion-resistant layer 2 by welding, when the two pipe sections 1 are connected to each other, the two corner rings 3 are squeezed between the two connecting flanges 11 and forced to be in close contact with each other, thereby isolating and sealing the seam between the corrosion-resistant layer 2 on the inner side of the pipe section 1. Moreover, the integrally rolled corner ring 3 has a stable overall structure. When the chimney is in use and shaken, the corner ring 3 and the corrosion-resistant part, as well as the corner ring 3 and the connecting flange 11, have stable structures. Compared with the structure formed by welding a cylinder and a circular ring, it can effectively avoid damage and air leakage at the joints.

[0021] Among them, a flange rib plate can be arranged between the outer wall of the pipe segment 1 and the connecting flange 11 to enhance the structural stability between the connecting flange 11 and the pipe segment 1. The flange rib plate has at least one right angle. The two right-angle sides of the flange rib plate are respectively welded and fixed to the connecting flange 11 and the outer wall of the pipe segment 1. Multiple flange rib plates are evenly spaced along the circumference of the pipe segment 1.

[0022] Furthermore, a fourth sealing ring 4 is provided between the joints of two adjacent pipe sections 1, the fourth sealing ring 4 is located outside the anti-corrosion strip assembly, and the fourth sealing ring 4 elastically contacts the two connecting flanges 11. The fourth sealing ring 4 can ensure that there is no air leakage between the pipe sections 1.

[0023] Example 2

[0024] Reference Figure 2 The difference between Example 2 and Example 1 is that the structure of the corner ring 3 is different.

[0025] In another embodiment of the present application, a first annular groove 111 is coaxially provided on the connection flange 11 at one end of the pipe segment 1, a first elastic protrusion 31 is provided on the corner ring 3 near the first annular groove 111 and protrudes into the first annular groove 111, and a first sealing ring is filled in the first annular groove 111. A second annular groove 112 is provided on the connection flange 11 at the other end of the pipe segment 1 away from the first annular groove 111, the second annular groove 112 is concentric with and staggered with the first annular groove 111, a second elastic protrusion 32 is provided on the corner ring 3 near the second annular groove 112 and protrudes into the second annular groove 112, and a second sealing ring is filled in the second annular groove 112.

[0026] When two pipe segments 1 are connected and the connecting flange 11 is squeezed by the flange bolts 12, the first elastic protrusion 31 on one corner ring 3 is inserted into the first annular groove 111 on the connecting flange 11 at the end of the pipe segment 1 where it is located, and the second elastic protrusion 32 on the other corner ring 3 is inserted into the second annular groove 112 on the connecting flange 11 at the end of the other pipe segment 1 at the joint. By the cooperation between the first annular groove 111 and the first elastic protrusion 31 and the cooperation between the second annular groove 112 and the second elastic protrusion 32, the relative position of the corner ring 3 after it extends between the two connecting flanges 11 during the installation process can be effectively limited, so as to avoid the corner ring 3 being squeezed into the inside of the pipe segment 1 and causing a gap in the welding seam between the corner ring 3 and the inner wall of the pipe segment 1.

[0027] Furthermore, the first filling part 33 and the second filling part 34 adapted to the first elastic protrusion 31 and the second elastic protrusion 32 are respectively arranged on the corner rings 3 at both ends of the pipe section 1, and a third sealing ring is also filled and arranged between the first filling part 33, the first elastic protrusion 31 and the second filling part 34, and the second elastic protrusion 32. When the two corner rings 3 are attached to each other, the first filling parts 33 of the two corner rings 3 are engaged with the first elastic protrusion 31, the second filling part 34 is engaged with the second elastic protrusion 32, and the third sealing ring is filled between the two, which can limit the positions of the two corner rings 3 while maintaining the sealing of the joint between the two angle iron rings.

[0028] The first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring 4 can all be made of high temperature resistant rubber sealing rings, or asbestos ropes impregnated with high temperature resistant sealant, which can effectively ensure the sealing and isolation effect of chimney smoke.

[0029] The parts with the first elastic protrusion 31 and the second elastic protrusion 32 on the two corner rings 3 can be formed by stamping metal rings and sleeved on the outer side of the corner rings 3, and fixed to the corner rings 3 by spot welding or other methods.

[0030] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications 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 equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An internal sealing support structure for a chimney flange connection, characterized in that: It comprises a plurality of pipe sections (1) connected coaxially end to end, the outer walls of both ends of the pipe sections (1) are coaxially fixedly connected with connecting flanges (11), the connecting flanges (11) at the connection points of adjacent pipe sections (1) are connected by flange bolts (12), the inner walls of the pipe sections (1) are provided with corrosion-resistant layers (2), and anti-corrosion strip components are provided between adjacent pipe sections (1); The anti-corrosion strip assembly comprises two corner rings (3) with L-shaped cross-sections, one end edge of the corner ring (3) is coaxially welded to the inner wall of the corrosion-resistant layer (2), and the other end edge extends toward the connecting flange (11) of the pipe segment (1), and the two corner rings (3) are respectively connected to two adjacent pipe segments (1), and the corner rings (3) are made of the same material as the corrosion-resistant layer (2), and the two corner rings (3) between adjacent connecting flanges (11) are in close contact.

2. The chimney flange connection inner sealing support structure according to claim 1, characterized in that: The corner ring (3) is rolled into a circle by an angle steel bar and then both ends are welded and fixed.

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