Sealing structure for field connection of chimney flange

Abstract

The utility model provides a sealing structure for on-site connection of a chimney flange, and belongs to the technical field of chimney manufacturing. Comprising a plurality of pipe joints which are coaxially connected, connecting flanges are coaxially and fixedly connected to the outer portions of the two ends of each pipe joint, the connecting flanges close to each other on every two adjacent pipe joints are fixedly connected through a plurality of sets of flange bolts, the pipe joints are made of titanium steel composite plates, the titanium plate surfaces of the pipe joints face the inner sides, and annular patches are arranged on the inner sides of every two adjacent pipe joints along butt joints. The annular patch adopts a pure titanium strip, the annular patch covers a butt joint seam of the two adjacent pipe joints, and the edges of the two ends of the annular patch are welded and fixed to the inner walls of the two pipe joints respectively. The pipe joints are made of the titanium steel composite plates, the titanium plate surfaces of the pipe joints face inwards, and the joint positions of the inner sides of the two pipe joints are covered with the ring patches made of the pure titanium material, so that the inner wall of the flue on the inner side of the chimney is made of the titanium material, the carbon steel layers of the pipe joints are effectively prevented from being corroded, and 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 manufacturing, in particular to a sealing structure for on-site connection of chimney flanges. 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] At present, chimney pipe sections are made of titanium-steel composite plates, with the titanium plate surface of the titanium-steel composite plates facing the inside of the chimney to achieve corrosion resistance. However, due to the thicker pipe section plates, when the pipe sections are connected by welding, the welds often fail to completely cover the seams on the inside of the pipe sections. The flue gas in the chimney is still likely to corrode the carbon steel layer on the pipe sections, affecting the structural stability of the pipe sections. Utility Model Content

[0004] In view of the above problems, the utility model provides a sealing structure for on-site connection of chimney flanges.

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

[0006] Provided is a sealing structure for chimney flange field connection, comprising a plurality of coaxially connected pipe sections, both ends of each pipe section are coaxially fixedly connected with connecting flanges, the connecting flanges on two adjacent pipe sections that are close to each other are connected and fixed by multiple groups of flange bolts, the pipe section adopts titanium-steel composite plates, the titanium plate surfaces of the pipe sections face inwards, annular patches are arranged along the butt joints on the inner sides of the two adjacent pipe sections, the annular patches adopt pure titanium bars, the annular patches cover the butt joints of the two adjacent pipe sections, and the edges at both ends of the annular patches are respectively welded and fixed to the inner walls of the two pipe sections.

[0007] Furthermore, a sealing ring is provided in the joint between adjacent pipe sections, and the sealing ring is in sealing contact with the connecting flanges on both sides.

[0008] Furthermore, the diameter of the middle portion of the ring patch is smaller than the diameters of the two ends, so that an expansion and contraction cavity is formed between the middle portion of the ring patch and the seams of the two pipe sections.

[0009] Furthermore, corresponding through holes are opened on the connecting flanges at both ends of the pipe joint, and a limiting sleeve is inserted into the connecting flanges of two adjacent pipe joints. One end of the limiting sleeve is coaxially fixedly connected with a limiting plate for abutting against the outside of the through hole. The limiting sleeve is simultaneously inserted into the through holes on the two adjacent connecting flanges. The limiting sleeve and the through hole have an interference fit. The flange bolt includes a screw and a nut. The screw is threadedly connected to the nut after passing through the limiting sleeve.

[0010] Furthermore, one end of the limiting sleeve away from the limiting plate passes through two connecting flanges, and a thrust sleeve is provided on the side of the connecting flange close to the nut. The thrust sleeve is sleeved on the end of the limiting sleeve extending out of the connecting flange and abuts against the connecting flange, the screw passes through the thrust sleeve, and the nut abuts against the end of the thrust sleeve away from the connecting flange.

[0011] Furthermore, a sealing sleeve covering the gap between the two pipe sections is coaxially arranged in the expansion and contraction cavity, a lap ring is fixedly connected to the outside of the sealing sleeve vertically and radially along the sealing sleeve, sealing strips are arranged in the angles between the lap ring and the sealing sleeve on both sides, a clamping column is arranged on the connecting flange at one end of the pipe section, and the lap ring extends into the gap between the two pipe sections and is clamped with the clamping column.

[0012] The beneficial effect of the utility model is as follows: by adopting titanium-steel composite plates to make pipe sections, and making the titanium plates of the pipe sections face inward, and then using pure titanium ring patches to cover the joints on the inner sides of the two pipe sections, the inner walls of the flue inside the chimney can be made of titanium, which effectively prevents the carbon steel layer of the pipe sections from being corroded and prolongs the service life of the chimney. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the sealing structure for on-site connection of the chimney flange according to an embodiment of the present application.

[0014] Among them, 1. pipe joint; 11. connecting flange; 12. perforation; 13. clamping column; 2. ring patch; 21. expansion and contraction cavity; 3. sealing ring; 4. limiting sleeve; 41. limiting plate; 51. screw; 52. nut; 6. thrust sleeve; 7. sealing sleeve; 71. lap ring; 72. sealing strip. DETAILED DESCRIPTION

[0015] 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.

[0016] The present application embodiment discloses a sealing structure for on-site connection of a chimney flange, referring to Figure 1, several pipe segments 1, multiple pipe segments 1 are coaxially connected, and both ends of each pipe segment 1 are coaxially welded with connecting flanges 11. The pipe segment 1 is made of titanium steel composite plate, and the titanium plate surface of the pipe segment 1 faces the inside. The connecting flanges 11 close to each other on two adjacent pipe segments 1 are connected and fixed by multiple sets of flange bolts. Specifically, through holes 12 are correspondingly opened on the connecting flanges 11 at both ends of the pipe segment 1. The flange bolts include screws 51 and nuts 52. The screws 51 are threadedly connected to the nuts 52 after passing through the through holes 12 on the connecting flanges 11 on the two pipe segments 1.

[0017] An annular patch 2 is provided along the butt joint of the inner side of two adjacent pipe segments 1. The annular patch 2 is made of pure titanium strips. The annular patch 2 covers the butt joint of the two adjacent pipe segments 1, and the two end edges of the annular patch 2 are respectively welded and fixed to the inner walls of the two pipe segments 1. By placing the annular patch 2 made of pure titanium inside the pipe segment 1, covering the joint between the adjacent pipe segments 1, and welding the two side edges to the titanium plate surface inside the two pipe segments 1, the inner wall of the chimney can be completely closed by the titanium panel, effectively avoiding the corrosion of the carbon steel layer of the pipe segment 1 by flue gas, and greatly improving the service life of the chimney.

[0018] In order to improve the sealing performance of the gap between the two pipe sections 1 and prevent external rainwater from penetrating into the inner side of the pipe section 1, a sealing ring 3 is provided in the joint between the adjacent pipe sections 1, and the sealing ring 3 is in sealing contact with the connecting flanges 11 on both sides. The sealing ring 3 can be an asbestos rope soaked in sealant, or a high temperature resistant rubber ring.

[0019] Furthermore, the diameter of the middle of the ring patch 2 is smaller than that of the two ends, so that an expansion and contraction cavity 21 is formed between the middle of the ring patch 2 and the joints of the two pipe sections 1. The ring patch 2 is made of a pure titanium plate with an arc-shaped cross section and rolled into a cylinder with a contracted middle part by a special processing rolling machine, so that the ring patch 2 has a slight elasticity along its own axial direction. During the use of the chimney, the flange bolts may loosen and the chimney may shake, which may cause the size of the joints between the pipe sections 1 to change, and easily cause cracks to appear at the welding position of the ring patch 2 and the inner wall of the chimney pipe section 1. After the ring patch 2 has an expansion margin, the ring patch 2 can still maintain a stable connection with the inner wall of the pipe section 1 during the shaking of the chimney pipe section 1.

[0020] Furthermore, in order to improve the coaxial stability between the pipe segments 1, a limiting sleeve 4 is also inserted into the through-holes 12 of the connecting flanges 11 of two adjacent pipe segments 1. The limiting sleeve 4 passes through the two through-holes 12 at the same time and is connected with the through-holes 12 by interference fit. One end of the limiting sleeve 4 is coaxially connected with a limiting plate 41 for overlapping the outer wall of the connecting flange 11. The screw 51 of the flange bolt passes through the limiting sleeve 4 and is threadedly connected with the nut 52. The relative positional relationship between adjacent pipe segments 1 can be further limited by the limiting sleeve 4 in each through-hole 12 to avoid relative torsion, deflection, translation, etc. between the pipe segments 1, thereby ensuring the stability of the connection structure of the ring patch 2 in the pipe segment 1.

[0021] Furthermore, one end of the limiting sleeve 4 away from the limiting sheet 41 passes through the two connecting flanges 11, and a thrust sleeve 6 is provided on the side of the connecting flange 11 close to the nut 52. The thrust sleeve 6 is sleeved on the end of the limiting sleeve 4 extending out of the connecting flange 11 and abuts against the connecting flange 11. The screw 51 passes through the thrust sleeve 6, and the nut 52 abuts against the end of the thrust sleeve 6 away from the connecting flange 11. By providing the thrust sleeve 6, the barrel of the limiting sleeve 4 can be completely passed through the two connecting flanges 11 and then accommodated in the thrust sleeve 6. The nut 52 pushes the thrust sleeve 6 to indirectly abut against the connecting flange 11, which ensures that the limiting sleeve 4 has a limiting effect on the two pipe joints 1, and also effectively limits the movement of the flange bolts on the connecting flange 11.

[0022] Furthermore, a sealing sleeve 7 covering the gap between the two pipe sections 1 is coaxially arranged in the expansion and contraction cavity 21, and a lap ring 71 is fixedly connected to the outside of the sealing sleeve 7 vertically and radially along the sealing sleeve 7, and sealing strips 72 are arranged in the angles between the lap ring 71 and the sealing sleeve 7 on both sides, and a clamping column 13 is arranged on the connecting flange 11 at one end of the pipe section 1, and the lap ring 71 extends into the gap between the two pipe sections 1 and is clamped with the clamping column 13. The sealing strip 72 can also be made of high-temperature resistant rubber or asbestos rope soaked in sealant. A clamping hole matching the size of the clamping column 13 is opened on the lap ring 71. After the lap ring 71 is clamped and matched with the clamping column 13 on the connecting flange 11 of the pipe segment 1, the two pipe segments 1 are connected in position, so that the two pipe segments 1 can clamp the sealing strip 72 between the lap ring 71 and the sealing sleeve 7. The sealing sleeve 7 and the lap ring 71 are also made of pure titanium plate. When the ring patch 2 in the pipe segment 1 is damaged, the sealing sleeve 7 and the sealing strip 72 between the pipe segments 1 can still play a good sealing and anti-corrosion effect, thereby ensuring the stability of the chimney structure.

[0023] 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. A sealing structure for chimney flange field connection, characterized in that: The invention comprises a plurality of coaxially connected pipe sections (1), wherein both ends of each pipe section (1) are coaxially fixedly connected with connecting flanges (11), and the connecting flanges (11) on two adjacent pipe sections (1) that are close to each other are connected and fixed by multiple groups of flange bolts. The pipe section (1) is made of titanium-steel composite plates, and the titanium plate surface of the pipe section (1) faces inwards. An annular patch (2) is arranged along the butt joint of the inner side of two adjacent pipe sections (1), and the annular patch (2) is made of pure titanium bars. The annular patch (2) covers the butt joint of the two adjacent pipe sections (1), and the edges at both ends of the annular patch (2) are respectively welded and fixed to the inner walls of the two pipe sections (1).

2. A sealing structure for on-site connection of chimney flange according to claim 1, characterized in that: A sealing ring (3) is provided in the joint between adjacent pipe sections (1), and the sealing ring (3) is in sealing contact with the connecting flanges (11) on both sides.

3. A sealing structure for on-site connection of chimney flange according to claim 2, characterized in that: The diameter of the middle portion of the ring patch (2) is smaller than the diameters of the two ends, so that an expansion and contraction cavity (21) is formed between the middle portion of the ring patch (2) and the seams of the two pipe sections (1).

4. The sealing structure for chimney flange on-site connection according to claim 1, characterized in that: The connecting flanges (11) at both ends of the pipe joint (1) are provided with corresponding through holes (12). The connecting flanges (11) of two adjacent pipe joints (1) are provided with limiting sleeves (4). One end of the limiting sleeve (4) is coaxially fixedly connected with a limiting plate (41) for abutting against the outside of the through hole (12). The limiting sleeve (4) is simultaneously passed through the through holes (12) on the two adjacent connecting flanges (11). The limiting sleeve (4) and the through hole (12) are interference fit. The flange bolt comprises a screw rod (51) and a nut (52). The screw rod (51) is threadedly connected with the nut (52) after passing through the limiting sleeve (4).

5. The sealing structure for chimney flange on-site connection according to claim 4, characterized in that: One end of the limiting sleeve (4) away from the limiting plate (41) passes through two connecting flanges (11); a thrust sleeve (6) is provided on the side of the connecting flange (11) close to the nut (52); the thrust sleeve (6) is sleeved on the end of the limiting sleeve (4) extending out of the connecting flange (11) and abuts against the connecting flange (11); the screw (51) passes through the thrust sleeve (6); and the nut (52) abuts against one end of the thrust sleeve (6) away from the connecting flange (11).

6. The sealing structure for chimney flange on-site connection according to claim 3, characterized in that: A sealing sleeve (7) covering the gap between the two pipe sections (1) is coaxially arranged in the expansion and contraction cavity (21); a lap ring (71) is fixedly connected to the outside of the sealing sleeve (7) in a radially vertical direction of the sealing sleeve (7); sealing strips (72) are arranged in the angles between the two sides of the lap ring (71) and the sealing sleeve (7); a clamping column (13) is arranged on the connecting flange (11) at one end of the pipe section (1); the lap ring (71) extends into the gap between the two pipe sections (1) and is clamped to the clamping column (13).

Images