A self-sealing device for non-metallic expansion joints in desulfurization flues

Abstract

This utility model discloses a self-sealing device for a non-metallic expansion joint in a desulfurization flue, comprising a flue pipe body, a connecting flange welded to the bottom of the flue pipe body, a sealing pipe sleeved on the upper outer side of the flue pipe body, a connecting pipe sleeved on the upper outer side of the sealing pipe, a fixed base welded to the middle outer side of the flue pipe body, a rack symmetrically welded above the fixed base, and connecting parts adapted to the rack symmetrically welded to both sides of the connecting pipe. A driving assembly is rotatably connected to the inner side of the fixed groove. The driving assembly drives the rack to slide inside the connecting parts, and a limiting assembly limits the rack, improving the stability of the connection between the flue pipe body and the connecting pipe and preventing gas leakage inside the pipe.

Description

Technical Field

[0001] This utility model relates to the technical field of non-metallic expansion joint sealing devices, specifically to a self-sealing device for non-metallic expansion joints in desulfurization flues. Background Technology

[0002] Expansion joints are flexible elements that can effectively compensate for axial deformation. For example, expansion joints welded to the shell of a fixed tube sheet heat exchanger have high axial flexibility and are easy to deform. They can compensate for the thermal expansion difference between the tubes and the shell caused by different wall temperatures, reduce their axial load, thereby reducing the thermal stress of the tubes, tube sheet and shell, and avoiding strength failure, instability failure and tube pull-out failure.

[0003] In actual production, due to limited operating space, it is inconvenient for workers to connect non-metallic expansion joints to pipelines. When non-metallic expansion joints age, it is also inconvenient for workers to replace them, which reduces maintenance efficiency.

[0004] Therefore, based on this, a design or technical improvement is proposed to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned shortcomings and provide a self-sealing device for non-metallic expansion joints in desulfurization flues.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A self-sealing device for a non-metallic expansion joint in a desulfurization flue includes a flue pipe body. A connecting flange is welded to the bottom of the flue pipe body. A sealing pipe is sleeved on the upper outer side of the flue pipe body. The inner wall of the outer side of the flue pipe body is fitted with the inner side of the sealing pipe. A connecting pipe is sleeved on the upper outer side of the sealing pipe. The inner side of the connecting pipe is fitted with the outer side of the sealing pipe. A fixed base is welded to the middle outer side of the flue pipe body. A rack is symmetrically welded above the fixed base. Connecting parts adapted to the rack are symmetrically welded to the left and right sides of the connecting pipe. Each connecting part includes a connecting seat fixedly connected to the lower two sides of the connecting pipe. A fixing groove adapted to the rack is opened on the inner wall of the connecting seat. The rack is slidably connected to the inner side of the fixing groove. A driving assembly is rotatably connected to the inner side of the fixing groove for driving the rack to slide within the fixing groove.

[0008] Furthermore, the drive assembly includes a gear rotatably connected to the inside of the fixed groove, the gear meshing with the rack, a connecting rod fixedly connected to one side of the gear, the connecting rod penetrating the inner wall of the connecting seat, a rotating handle welded to one end of the connecting rod, and a limit assembly provided below the gear for limiting the rack.

[0009] Furthermore, the limiting assembly includes a limiting rod rotatably connected to the inner side of the fixed groove. The limiting rod is located below the gear, and fixing pins are fixedly connected to both sides of the limiting rod. The inner wall of the connecting seat has fixing holes adapted to the fixing pins. The upper end of the limiting rod is adapted to the rack, and a pressure plate is welded to the lower end of the limiting rod. A fixing block is welded to the inner side of the lower part of the fixed groove. Limiting grooves are formed on the inner walls of both the fixing block and the pressure plate. A return spring is embedded inside the limiting groove.

[0010] Furthermore, the inner wall of the fixed base is provided with a slot adapted to the sealing pipe, and a first sealing ring is sleeved on the outer side of the flue pipe body. The first sealing ring is embedded in the inner side of the slot, and the lower end opening of the sealing pipe is in contact with the first sealing ring.

[0011] Furthermore, a sealing ring is welded to the inner side of the lower part of the connecting pipe, and an annular sealing strip adapted to the flue pipe body is fixedly connected to the inner side of the sealing ring. The annular sealing strip fits against the outer side of the flue pipe body, and a third sealing ring is sleeved on the outer side of the flue pipe body. The third sealing ring is in contact with the lower surface of the sealing ring, and the upper opening of the sealing pipe is in contact with the third sealing ring.

[0012] Furthermore, a limiting ring is welded to the upper inner side of the connecting pipe, and a positioning groove adapted to the flue pipe body is opened on the lower inner wall of the limiting ring. A second sealing ring is fixedly connected inside the positioning groove, and the upper opening of the flue pipe body is in contact with the second sealing ring.

[0013] Compared with existing technologies, the beneficial effects of this solution are:

[0014] 1. The device achieves high-efficiency sealing through a multi-layer sealing structure. The first sealing ring, fitted on the outer side of the flue pipe body, is embedded in the groove of the fixed base and contacts the lower opening of the sealing pipe, forming the first seal. The annular sealing strip on the inner side of the connecting pipe fits against the outer side of the flue pipe body, forming the second seal. The third sealing ring contacts the upper opening of the sealing pipe, forming the third seal. The second sealing ring below the limiting ring contacts the upper opening of the flue pipe body, forming the fourth seal. The multiple seals work together to significantly improve the overall sealing performance of the device, effectively preventing the leakage of corrosive gases and liquids in the desulfurization flue, ensuring a safe working environment, and reducing the risk of equipment corrosion.

[0015] 2. In the drive assembly, the gear meshes with the rack. Rotating the handle drives the connecting pipe to slide along the rack, thereby causing the sealing pipe and the connecting pipe to move relative to the main body of the flue pipe. This allows for flexible adaptation to the expansion or contraction of the flue pipe caused by temperature changes. The limiting assembly is adapted to the rack through the limiting rod. With the help of the return spring, the rack can be stably limited after the device is adjusted, preventing the connecting pipe and the sealing pipe from shifting during operation and ensuring the stability of the structure during dynamic changes. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram showing the connection between the sealed pipe and the main body of the flue pipe of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the connecting pipe of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the connector of this utility model.

[0021] In the diagram: 1. Main body of flue pipe; 2. Fixed base; 3. Slot; 4. Sealing pipe; 5. First sealing ring; 6. Rack; 7. Connecting pipe; 8. Connecting seat; 9. Fixing groove; 10. Gear; 11. Connecting rod; 12. Rotating handle; 13. Limiting rod; 14. Fixing pin; 15. Fixing block; 16. Limiting groove; 17. Return spring; 18. Limiting ring; 19. Positioning groove; 20. Second sealing ring; 21. Sealing ring; 22. Annular sealing strip; 23. Third sealing ring; 24. Fixing hole; 25. Connecting flange; 26. Pressure plate. Detailed Implementation

[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] like Figures 1-4The self-sealing device for a non-metallic expansion joint in a desulfurization flue includes a flue pipe body 1. A connecting flange 25 is welded to the bottom of the flue pipe body 1 for connecting to an external desulfurization flue. A sealing pipe 4 is sleeved on the upper outer side of the flue pipe body 1 for sealing the pipe connection. The inner wall of the outer side of the flue pipe body 1 fits against the inner side of the sealing pipe 4. A connecting pipe 7 is sleeved on the upper outer side of the sealing pipe 4, and the inner side of the connecting pipe 7 fits against the outer side of the sealing pipe 4. A fixed base 2 is welded to the middle outer side of the flue pipe body 1. A rack 6 is symmetrically welded above the fixed base 2. Connecting parts adapted to the rack 6 are symmetrically welded on both sides of the connecting pipe 7. The connecting parts include connecting seats 8 fixedly connected to the lower sides of the connecting pipe 7. A fixing groove 9 adapted to the rack 6 is opened on the inner wall of the connecting seat 8. The rack 6 is slidably connected to the inner side of the fixing groove 9. A driving component is rotatably connected to the inner side of the fixing groove 9 for driving the rack 6 to slide within the fixing groove 9.

[0024] In one embodiment, the drive assembly includes a gear 10 rotatably connected to the inside of the fixed groove 9. The gear 10 meshes with the rack 6 and drives the rack 6 to slide inside the fixed groove 9 during rotation. A connecting rod 11 is fixedly connected to one side of the gear 10. The connecting rod 11 passes through the inner wall of the connecting seat 8. A rotating handle 12 is welded to one end of the connecting rod 11. A limit assembly is provided below the gear 10 to limit the rack 6.

[0025] In one embodiment, the limiting assembly includes a limiting rod 13 rotatably connected to the inner side of the fixing groove 9. The limiting rod 13 is located below the gear 10. Fixing pins 14 are fixedly connected to both sides of the limiting rod 13. The inner wall of the connecting seat 8 is provided with fixing holes 24 that are adapted to the fixing pins 14. The upper end of the limiting rod 13 is adapted to the rack 6 for limiting the rack 6. A pressure plate 26 is welded to the lower end of the limiting rod 13. A fixing block 15 is welded to the inner side of the lower part of the fixing groove 9. Limiting grooves 16 are provided on the inner walls of the fixing block 15 and the pressure plate 26. A return spring 17 is embedded in the inside of the limiting groove 16 for pushing the limiting rod 13 to rotate inside the fixing groove 9 so that it remains in contact with the rack 6, thereby limiting it.

[0026] In one embodiment, the inner wall of the fixed base 2 is provided with a groove 3 that is adapted to the sealing pipe 4, and a first sealing ring 5 is sleeved on the outer side of the flue pipe body 1. The first sealing ring 5 is embedded in the inner side of the groove 3, and the lower end opening of the sealing pipe 4 is in contact with the first sealing ring 5 to form a first seal on the lower end of the sealing pipe 4.

[0027] In one embodiment, a sealing ring 21 is welded to the inner side of the lower part of the connecting pipe 7. An annular sealing strip 22 adapted to the flue pipe body 1 is fixedly connected to the inner side of the sealing ring 21. The annular sealing strip 22 fits against the outer side of the flue pipe body 1 to form a second seal. A third sealing ring 23 is sleeved on the outer side of the flue pipe body 1. The third sealing ring 23 is in contact with the lower surface of the sealing ring 21. The upper opening of the sealing pipe 4 is in contact with the third sealing ring 23. The third sealing ring 23 seals the upper end of the sealing pipe 4 to form a third seal.

[0028] In one embodiment, a limiting ring 18 is welded to the upper inner side of the connecting pipe 7, and a positioning groove 19 adapted to the flue pipe body 1 is provided on the lower inner wall of the limiting ring 18 for limiting the upper end of the flue pipe body 1. A second sealing ring 20 is fixedly connected inside the positioning groove 19, and the upper opening of the flue pipe body 1 is in contact with the second sealing ring 20 to form a fourth seal.

[0029] The specific workflow of this plan is as follows:

[0030] The device is fixedly connected to the external desulfurization flue via a connecting flange 25 welded to the bottom of the flue pipe body 1, providing an installation foundation for the entire device. A first sealing ring 5 is embedded in the groove 3 on the inner wall of the fixing base 2. The sealing pipe 4 is sleeved on the outer side above the flue pipe body 1, and its lower opening contacts the first sealing ring 5 to form the first sealing structure. The connecting pipe 7 is sleeved on the outer side above the sealing pipe 4, and an annular sealing strip 22 is fixed inside the sealing ring 21 on the inner side below the connecting pipe 7. The annular sealing strip 22 is connected to the flue pipe. The outer side of the main body 1 of the flue pipe is fitted together to form a second sealing structure; the third sealing ring 23 fitted on the outer side of the main body 1 of the flue pipe is in contact with the lower surface of the sealing ring 21, and at the same time, the upper opening of the sealing pipe 4 is in contact with the third sealing ring 23 to form a third sealing mechanism; the second sealing ring 20 is fixed in the positioning groove 19 on the inner wall below the limiting ring 18 on the upper inner side of the connecting pipe 7, and the upper opening of the main body 1 of the flue pipe is in contact with the second sealing ring 20 to form a fourth sealing mechanism, thereby improving the sealing performance of the equipment and preventing the leakage of harmful gases.

[0031] During connection, the rotating handle 12 at one end of the connecting rod 11 in the reverse drive assembly rotates in the opposite direction. The connecting rod 11 drives the gear 10 inside the fixed groove 9 to rotate synchronously. Since the gear 10 and the rack 6 mesh with each other, and the rack 6 is slidably connected inside the fixed groove 9, when the gear 10 rotates in the reverse direction, it drives the rack 6 to slide upward inside the fixed groove 9. At this time, the connecting seat 8 and the connecting pipe 7 fixed to it move downward relative to the rack 6. During the upward sliding of the rack 6 inside the fixed groove 9, the rack 6 pushes the limit rod 13 to rotate, thus resetting the position. When the spring 17 is compressed, the limiting rod 13 cannot limit the rack 6. When the gas in the pipe is heated and expands, the connecting pipe 7 and the flue pipe body 1 are separated. At this time, the flue pipe body 1 moves downward relative to the connecting pipe 7, which drives the rack 6 to move synchronously. Since the rack 6 and the limiting rod 13 are in contact with each other, during the downward movement, under the action of the return spring 17, the limiting rod 13 is pushed to contact the rack 6, which limits the rack 6, thereby preventing the connecting pipe 7 and the flue pipe body 1 from deviating.

[0032] During normal operation of the device, the multiple sealing structures work together. The first sealing ring 5 continuously seals the lower end of the sealing pipe 4, the third sealing ring 23 seals the upper end of the sealing pipe 4, the annular sealing strip 22 fits tightly against the outside of the flue pipe body 1, the second sealing ring 20 seals the upper end of the flue pipe body 1, and at the same time, the limiting ring 18 limits the upper end of the flue pipe body 1 through the positioning groove 19, ensuring that each sealing component is always in a fitted state, effectively preventing the leakage of corrosive gases and liquids in the desulfurization flue and maintaining a good sealing effect.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A self-sealing device for a non-metallic expansion joint of a desulphurization flue comprising a flue pipe body (1), characterized in that: A connecting flange (25) is welded to the bottom of the flue pipe body (1). A sealing pipe (4) is fitted on the upper outer side of the flue pipe body (1). The inner wall of the outer side of the flue pipe body (1) is fitted with the inner side of the sealing pipe (4). A connecting pipe (7) is fitted on the upper outer side of the sealing pipe (4). The inner side of the connecting pipe (7) is fitted with the outer side of the sealing pipe (4). A fixed base (2) is welded to the middle outer side of the flue pipe body (1). The upper part of the fixed base (2) is aligned with the outer side of the sealing pipe (4). The connecting pipe (7) is welded with a rack (6), and the left and right sides of the connecting pipe (7) are symmetrically welded with connectors adapted to the rack (6). The connectors include connecting seats (8) fixedly connected to the left and right sides below the connecting pipe (7). The inner wall of the connecting seat (8) is provided with a fixing groove (9) adapted to the rack (6). The rack (6) is slidably connected to the inner side of the fixing groove (9). The inner side of the fixing groove (9) is rotatably connected with a driving component for driving the rack (6) to slide inside the fixing groove (9).

2. A self-sealing device for a non-metallic expansion joint of a desulphurization flue according to claim 1, characterized in that: The drive assembly includes a gear (10) rotatably connected to the inside of the fixed groove (9), the gear (10) meshing with the rack (6), a connecting rod (11) fixedly connected to one side of the gear (10), the connecting rod (11) penetrating the inner wall of the connecting seat (8), a rotating handle (12) welded to one end of the connecting rod (11), and a limit assembly provided below the gear (10) for limiting the rack (6).

3. A self-sealing device for a non-metallic expansion joint in a desulfurization flue according to claim 2, characterized in that: The limiting assembly includes a limiting rod (13) rotatably connected to the inside of the fixed groove (9). The limiting rod (13) is located below the gear (10). Fixed pins (14) are fixedly connected to both sides of the limiting rod (13). The inner wall of the connecting seat (8) is provided with a fixing hole (24) adapted to the fixing pin (14). The upper end of the limiting rod (13) is adapted to the rack (6). A pressure plate (26) is welded to the lower end of the limiting rod (13). A fixing block (15) is welded to the inner side below the fixed groove (9). The inner walls of the fixing block (15) and the pressure plate (26) are both provided with limiting grooves (16). A return spring (17) is embedded inside the limiting groove (16).

4. A self-sealing device for a non-metal expansion joint of a desulphurization flue as claimed in claim 1, wherein: The inner wall of the fixed base (2) is provided with a slot (3) that is adapted to the sealing pipe (4). The outer side of the flue pipe body (1) is provided with a first sealing ring (5). The first sealing ring (5) is embedded in the inner side of the slot (3). The lower end opening of the sealing pipe (4) is in contact with the first sealing ring (5).

5. A self-sealing device for a non-metallic expansion joint of a desulphurization flue as claimed in claim 1, wherein: A sealing ring (21) is welded to the inner side of the lower part of the connecting pipe (7). An annular sealing strip (22) adapted to the flue pipe body (1) is fixedly connected to the inner side of the sealing ring (21). The annular sealing strip (22) fits against the outer side of the flue pipe body (1). A third sealing ring (23) is sleeved on the outer side of the flue pipe body (1). The third sealing ring (23) is in contact with the lower surface of the sealing ring (21). The upper opening of the sealing pipe (4) is in contact with the third sealing ring (23).

6. A self-sealing device for a non-metal expansion joint of a desulphurization flue according to claim 5, characterized in that: A limiting ring (18) is welded to the upper inner side of the connecting pipe (7). A positioning groove (19) adapted to the flue pipe body (1) is opened on the lower inner wall of the limiting ring (18). A second sealing ring (20) is fixedly connected inside the positioning groove (19). The upper opening of the flue pipe body (1) is in contact with the second sealing ring (20).

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