A chimney telescopic expansion joint

Abstract

The chimney telescopic expansion joint disclosed by the application comprises an inlet pipe, a section pipe and an outlet pipe; the inlet pipe comprises a circular ring columnar inlet connector and a circular ring-shaped fixing plate formed on the right end of the inlet connector; the section pipe comprises a circular ring columnar section pipe body; the left end of the section pipe body is formed with a circular ring-shaped sliding plate, and the right end is connected with the outlet pipe; a left limiting assembly is connected on the fixing plate; the left limiting assembly comprises a circular ring-shaped limiting plate; the left side end of the limiting plate is formed with a circular ring columnar limiting pipe; the sliding plate is slidingly arranged between the fixing plate and the limiting plate; the outer diameter of the sliding plate is smaller than the inner diameter of the limiting pipe; a first axial compensation assembly is arranged between the outlet pipe and the section pipe body. The chimney expansion joint has the effect of improving the deformation absorption capacity of the chimney expansion joint through compensation in two directions of radial and axial directions.

Description

Technical Field

[0001] This invention relates to the field of chimneys, and more particularly to a chimney expansion joint. Background Technology

[0002] In existing thermal power plants, flue gas is discharged to the outside through the chimney. Since the flue gas carries heat, the chimney will deform due to thermal expansion. At this time, expansion joints are installed on the chimney to absorb these deformations. Expansion joints are generally fluorinated rubber rings.

[0003] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the fluorinated rubber ring is a fluorinated rubber bellows; the fluorinated rubber ring is resistant to high temperature and still has elasticity at high temperatures, but its elasticity is small, so the axial and radial absorption cannot meet the requirements. Summary of the Invention

[0004] To address the technical problem of improving the absorption capacity of chimney deformation, this invention provides a chimney expansion joint.

[0005] The present invention provides a chimney expansion joint with the following technical solution:

[0006] A chimney expansion joint includes an inlet pipe, a section pipe, and an outlet pipe. The inlet pipe includes a cylindrical inlet connector and a cylindrical fixing plate formed at the right end of the inlet connector. The section pipe includes a cylindrical section body. A cylindrical sliding plate is formed at the left end of the section body, and the right end is connected to the outlet pipe. A left limiting assembly is connected to the fixing plate. The left limiting assembly includes a cylindrical limiting plate. A cylindrical limiting tube is formed at the left end of the limiting plate. The sliding plate slides between the fixing plate and the limiting plate. The outer diameter of the sliding plate is smaller than the inner diameter of the limiting tube. The inner diameter of the limiting plate is larger than the outer diameter of the section body. A first axial compensation assembly is provided between the outlet pipe and the section body.

[0007] By adopting the above technical solution, since the sliding plate is slidably set between the fixed plate and the limiting plate, it can absorb the radial deformation when the chimney expands due to heat; since the first axial compensation component is set between the outlet pipe and the main body of the section pipe, it can absorb the axial deformation when the chimney expands due to heat; through the compensation settings in both radial and axial directions, the chimney expansion joint has sufficient deformation absorption capacity.

[0008] Optionally, a fixed flange is formed on the outer cylindrical surface of the right end of the pipe segment body; a gland flange is formed on the outer cylindrical surface of the left end of the outlet pipe; the outer diameter of the outlet pipe is equal to the inner diameter of the pipe segment body and the left end of the outlet pipe is inserted into the right end opening of the pipe segment body; the first axial compensation assembly includes several left-right distributed first sealing rings and several first axial compensation bolts; the first sealing rings are sleeved on the outlet pipe and located inside the fixed flange; the left end of the gland flange is inserted into the right end opening of the fixed flange; the first axial compensation bolts pass through the gland flange and the fixed flange in the left-right direction and are screwed with a first axial compensation nut.

[0009] By adopting the above technical solution, by setting several first sealing rings distributed on the left and right between the gland flange and the main body of the pipe section, the sealing can be satisfied while absorbing axial deformation. At the same time, the connection method of the first axial compensation bolt, the gland flange and the fixed flange can satisfy both fastening and absorption of deformation.

[0010] Optionally, the fixed flange includes a cylindrical annular fixed flange seat welded to the outer cylindrical surface of the main body of the pipe section; a circular fixed flange ring is welded to the right end of the fixed flange seat; the gland flange includes a cylindrical annular gland flange seat welded to the outer cylindrical surface of the outlet pipe; a circular gland flange ring is welded to the right end of the gland flange seat; the outer diameter of the gland flange seat is the same as the inner diameter of the fixed flange seat; the first axial compensating bolt passes through the fixed flange ring and the gland flange ring in the left-right direction.

[0011] By adopting the above technical solution, the left end of the gland flange seat can extend between the fixed flange seat and the outlet pipe, ensuring accurate connection position of the segment pipe and the outlet pipe. At the same time, it can compress the first sealing ring to achieve the best sealing and compensation effect, and the first sealing ring can be increased or decreased adaptively.

[0012] Optionally, the limiting tube and the fixing plate are welded together as one piece.

[0013] By adopting the above technical solution, the limiting pipe and the fixing plate are welded together to ensure the connection stability between the inlet pipe and the section pipe, and the chimney can work normally.

[0014] Optionally, the limiting tube is sleeved on the fixing plate from right to left; a coaxially arranged annular cylindrical inner support tube is formed on the left end face of the fixing plate; a second axial compensation component is provided between the inner support tube and the limiting tube.

[0015] By adopting the above technical solution, a second axial compensation component is provided between the inner support tube and the limiting tube, which further improves the absorption of axial deformation.

[0016] Optionally, the left end of the limiting tube is detachably fixed with an annular outer support ring; a compression bolt is threaded through and screwed onto the outer support ring from left to right; the second axial compensation assembly includes a plurality of second sealing rings distributed on the left and right and an annular compression ring sleeved on the inner support tube; the second sealing ring is located on the right side of the compression ring; the right end of the compression bolt abuts against the compression ring vertically; the compression ring abuts against the second sealing ring on its right side.

[0017] By adopting the above technical solution, the compression ring abuts against the second sealing ring and the compression ring is adjustable left and right. This allows for the addition or removal of the second sealing ring, thereby increasing or decreasing its deformation absorption amount and enhancing its sealing performance.

[0018] Optionally, the left end of the limiting tube is formed with several connecting slots; the outer support ring is formed with several connecting holes with left and right openings; the portion between an adjacent pair of connecting holes mates with the connecting slots; a connecting bolt is radially screwed onto the outer cylindrical surface of the outer support ring; the inner end of the connecting bolt is screwed onto the limiting tube.

[0019] By adopting the above technical solution, the limiting tube and the outer support ring can be detachably connected, which is beneficial for the disassembly and assembly of the chimney expansion joint.

[0020] Optionally, the periphery of the fixing plate is fitted with an annular inner sealing ring; the inner cylindrical surface of the inner sealing ring is formed with an annular groove-shaped insertion groove that mates with the fixing plate.

[0021] By adopting the above technical solution, an inner sealing ring is provided around the fixed plate to improve the sealing performance of the chimney, and the insertion groove provided on the inner cylindrical surface of the inner sealing ring ensures the positional stability of the inner sealing ring.

[0022] Optionally, a ring-shaped left frame is formed on the outer cylindrical surface of the limiting tube; a ring-shaped right frame is formed on the outer cylindrical surface of the middle part of the segment tube body; a skin is connected between the outer ends of the right frame and the left frame; thermal insulation cotton is provided in the cavity between the left limiting component, the sliding plate, the segment tube body, the right frame and the skin; a plurality of pressure strips and a plurality of pressure plate bolts are provided between the outer ends of the right frame and the left frame; the pressure strips press down on the skin; the pressure plate bolts on the left frame side pass through the pressure strips, the skin and the left frame from the outside to the inside and are screwed with skin connecting nuts; the pressure plate bolts on the right frame side pass through the pressure strips, the skin and the right frame from the outside to the inside and are screwed with skin connecting nuts.

[0023] By adopting the above technical solutions, the insulation cotton and the skin have a heat insulation effect; the skin is connected more stably and is not easily damaged by the pressure strip.

[0024] Optionally, the outer ends of the left frame and the right frame are provided with a plurality of L-shaped ear plates evenly distributed around the circumference; the ear plates are formed with connecting holes; the ear plates on the left and right sides correspond one to one and a pair of ear plates facing each other are provided with transport rods; a pair of limiting nuts are screwed to both ends of the transport rods; the pair of limiting nuts on the same side clamp the ear plates on the corresponding side.

[0025] By adopting the above technical solution, a transport rod is connected during transportation, which prevents the left limiting component and the segment tube from moving relative to each other during transportation, and the skin is not easily damaged. During use, the transport rod is removed, allowing the segment tube and the left limiting component to move radially relative to each other to absorb radial deformation.

[0026] In summary, the beneficial effects of the present invention are as follows:

[0027] 1. The chimney expansion joint has sufficient deformation absorption capacity through compensation settings in both radial and axial directions.

[0028] 2. This ensures that the left limit component and the segment tube will not move relative to each other during transportation, and the skin is less likely to be damaged. Attached Figure Description

[0029] Figure 1 This is a left-side structural schematic diagram of Embodiment 1 of the present invention.

[0030] Figure 2 This is the invention Figure 1 A schematic diagram of the cross-section of AA.

[0031] Figure 3 This is the invention Figure 2 A magnified schematic diagram of part B in the diagram.

[0032] Figure 4 This is the invention Figure 3 A magnified schematic diagram of part C.

[0033] Figure 5 This is the invention Figure 3 A magnified schematic diagram of part D.

[0034] Figure 6 This is a cross-sectional structural schematic diagram of Embodiment 2 of the present invention.

[0035] Figure 7 This is the invention Figure 6 A magnified schematic diagram of part E in the diagram.

[0036] Figure 8 This is the invention Figure 7 A magnified schematic diagram of a portion of F.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Inlet pipe; 11. Inlet connector; 12. Left stiffening plate; 13. Left stiffening plate; 14. Inner support pipe;

[0039] 20. Pipe section; 21. Pipe section body; 22. Sliding plate; 23. Right frame inner support ring; 24. Right frame outer support ring; 25. Right stiffening plate; 26. Fixed flange; 261. Fixed flange seat; 262. Fixed flange ring;

[0040] 30. Left limiting assembly; 31. Limiting plate; 32. Limiting tube; 320. Connecting slot; 33. Inner support ring of the left frame; 34. Outer support ring of the left frame; 35. Central stiffener plate; 36. Extrusion bolt; 37. Extrusion ring; 38. Second sealing ring; 39. Inner sealing ring;

[0041] 40. Thermal insulation cotton;

[0042] 50. Skin;

[0043] 60. Pressure plate; 61. Pressure plate bolt; 62. Skin connecting nut;

[0044] 70. Transport tie rod; 71. Limit nut; 72. Ear plate;

[0045] 80. Outlet pipe; 81. Gland flange; 811. Gland flange seat; 812. Gland flange ring;

[0046] 90. First sealing ring;

[0047] 100. First axial compensating bolt; 101. First axial compensating nut. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1-8 The present invention will be described in further detail below.

[0049] This application discloses a chimney expansion joint, referring to... Figures 1-3 , Figure 6 and Figure 7 It includes an inlet pipe 10, a section pipe 20, an outlet pipe 80, and a left limiting component 30; the left limiting component 30 is used to limit the radial movement of the section pipe 20 and is disposed on the right end face of the inlet pipe 10; the outlet pipe 80 is connected to the right end of the section pipe 20; a first axial compensation component is disposed between the outlet pipe 80 and the section pipe 20; the first axial compensation component is used to absorb axial expansion.

[0050] Reference Figure 3 and Figure 7The inlet pipe 10 includes an annular cylindrical inlet connector 11 and an annular fixing plate 12 welded to the right end of the inlet connector 11; several circumferentially evenly distributed left stiffening plates 13 are welded between the outer cylindrical surface of the inlet connector 11 and the left end face of the fixing plate 12.

[0051] Reference Figure 3 and Figure 5 The segment pipe 20 includes a cylindrical segment pipe body 21; a cylindrical sliding plate 22 is welded to the left end of the segment pipe body 21, a cylindrical right frame is welded to the outer cylindrical surface in the middle, and a fixed flange 26 is welded to the outer cylindrical surface at the right end; the fixed flange 26 includes a cylindrical fixed flange seat 261 welded to the outer cylindrical surface of the segment pipe body 21; a cylindrical fixed flange ring 262 is welded to the right end of the fixed flange seat 261.

[0052] refer to Figure 3 and Figure 5 A gland flange 81 is formed on the outer cylindrical surface of the left end of the outlet pipe 80; the gland flange 81 includes a ring-shaped gland flange seat 811 on the outer cylindrical surface of the outlet pipe 80; a ring-shaped gland flange ring 812 is welded to the right end of the gland flange seat 811; the outer diameter of the gland flange seat 811 is the same as the inner diameter of the fixed flange seat 261.

[0053] refer to Figure 3 and Figure 5 The first axial compensation assembly includes several first sealing rings 90 distributed on the left and right and several first axial compensation bolts 100; the first sealing rings 90 are sleeved on the outlet pipe 80 and located inside the fixed flange seat 261; the left end of the gland flange seat 811 is inserted into the right end opening of the fixed flange seat 261; the first axial compensation bolts 100 pass through the fixed flange ring 262 and the gland flange ring 812 in the left and right directions and are screwed with first axial compensation nuts 101.

[0054] refer to Figure 3 and Figure 7 The left limiting component 30 includes an annular limiting plate 31; an annular cylindrical limiting tube 32 is welded to the left end of the limiting plate 31; an annular left frame is welded to the outer cylindrical surface of the limiting tube 32; the sliding plate 22 is slidably disposed between the fixed plate 12 and the limiting plate 31; the outer diameter of the sliding plate 22 is smaller than the inner diameter of the limiting tube 32.

[0055] refer to Figure 3 and Figure 7The left frame includes an annular inner support ring 33 welded to the outer cylindrical surface of the limiting tube 32; an annular cylindrical outer support ring 34 is welded to the outer end of the inner support ring 33; several circumferentially evenly distributed central rib plates 35 are formed on the right ends of the limiting plate 31, the limiting tube 32, and the inner support ring 33; the right frame includes an annular inner support ring 23 welded to the outer cylindrical surface of the middle part of the segment tube body 21; an annular cylindrical outer support ring 34 is welded to the outer end of the inner support ring 23. The outer support ring 24 of the right frame; several circumferentially evenly distributed right stiffening plates 25 are welded between the outer support ring 24 of the right frame, the inner support ring 23 of the right frame and the main body of the segment pipe 21; a skin 50 is connected between the outer ends of the outer support ring 24 of the right frame and the outer support ring 34 of the left frame; thermal insulation cotton 40 is installed in the cavity between the left limiting component 30, the sliding plate 22, the main body of the segment pipe 21, the right frame and the skin 50; the material of the skin 50 is vulcanized fluorinated rubber; the material of the thermal insulation cotton 40 is glass fiber cloth covered with aluminum silicate fiber cotton.

[0056] refer to Figure 3 , Figure 4 and Figure 7 Skin connecting assemblies are respectively provided on the outer support ring 24 of the right frame and the outer support ring 34 of the left frame; the skin connecting assembly includes several pressure plates 60 and several pressure plate bolts 61; the pressure plates 60 are located on the outside of the skin 50; the pressure plate bolts 61 on the right side pass through the pressure strip 60, the skin 50 and the outer support ring 24 of the right frame from the outside to the inside and are screwed with skin connecting nuts 62; the pressure plate bolts 61 on the left side pass through the pressure strip 60, the skin 50 and the outer support ring 34 of the left frame from the outside to the inside and are screwed with skin connecting nuts 62.

[0057] refer to Figure 3 , Figure 4 and Figure 7 An L-shaped ear plate 72 is fitted onto the pressure plate bolt 61; a connecting hole is formed on the ear plate 72; a transport rod 70 is threaded through a pair of ear plates 72 that correspond one-to-one and are opposite to each other; a pair of limit nuts 71 are screwed to both ends of the transport rod 70; a pair of limit nuts 71 on the same side clamp the ear plate 72 on the corresponding side.

[0058] refer to Figure 3 The left end faces of the limiting tube 32 and the fixing plate 12 are parallel and welded together.

[0059] In Example 2, reference Figures 6-8 The inner support ring 33 of the left frame is welded to the middle of the outer cylindrical surface of the limiting tube 32; the limiting tube 32 is sleeved on the fixing plate 12 from right to left; the periphery of the fixing plate 12 is sleeved with an annular inner sealing ring 39; the inner cylindrical surface of the inner sealing ring 39 is formed with an annular groove-shaped insertion groove that mates with the fixing plate 12.

[0060] A coaxially arranged annular cylindrical inner support tube 14 is welded to the left end face of the fixing plate 12; a second axial compensation component is provided between the inner support tube 14 and the limiting tube 32; an annular outer support ring 35 is detachably fixed to the left end of the limiting tube 32; a compression bolt 36 is threaded through and screwed onto the outer support ring 35 from left to right.

[0061] The second axial compensation assembly includes several second sealing rings 38 distributed on the left and right sides and an annular compression ring 37 sleeved on the inner support tube 14; the second sealing rings 38 are located on the right side of the compression ring 37; the right end of the compression bolt 36 abuts against the compression ring 37 vertically; the compression ring 37 abuts against the second sealing ring 38 on its right side.

[0062] The left end of the limiting tube 32 is formed with several connecting slots 320; the outer support ring 35 is formed with several connecting holes with left and right openings; the part between an adjacent pair of connecting holes mates with the connecting slots 320; a connecting bolt is radially screwed onto the outer cylindrical surface of the outer support ring 35; the inner end of the connecting bolt is screwed onto the limiting tube 32.

[0063] The working principle of a chimney expansion joint according to this application is as follows:

[0064] Example 1: During normal operation, all transport rods 70 are removed; the chimney expansion joint is installed on the chimney. When hot flue gas flows through, the chimney expands due to heat, thus the first sealing ring 90 is compressed, absorbing axial deformation; the sliding plate 22 slides between the fixed plate 12 and the limiting plate 31 to absorb radial deformation; thus, the chimney expansion joint has sufficient deformation absorption capacity through the compensation settings in both radial and axial directions.

[0065] Example 2: Based on Example 1, when the chimney expands due to heat, the second sealing ring 38 is compressed, further absorbing axial deformation; thus making the axial deformation absorption capacity of the chimney expansion joint stronger.

[0066] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A chimney expansion joint, characterized in that: It includes an inlet pipe (10), a segment pipe (20), and an outlet pipe (80); the inlet pipe (10) includes an annular cylindrical inlet connector (11) and an annular fixed plate (12) formed at the right end of the inlet connector (11); the segment pipe (20) includes an annular cylindrical segment pipe body (21); the left end of the segment pipe body (21) is formed with an annular sliding plate (22), and the right end is connected to the outlet pipe (80); a left limiting component (30) is connected to the fixed plate (12); the left... The limiting component (30) includes an annular limiting plate (31); a cylindrical limiting tube (32) is formed on the left side end of the limiting plate (31); the sliding plate (22) is slidably disposed between the fixed plate (12) and the limiting plate (31); the outer diameter of the sliding plate (22) is smaller than the inner diameter of the limiting tube (32); the inner diameter of the limiting plate (31) is larger than the outer diameter of the segment pipe body (21); a first axial compensation component is disposed between the outlet pipe (80) and the segment pipe body (21); The limiting tube (32) is sleeved on the fixing plate (12) from right to left; a coaxially arranged annular cylindrical inner support tube (14) is formed on the left end face of the fixing plate (12); a second axial compensation component is provided between the inner support tube (14) and the limiting tube (32). The left end of the limiting tube (32) is detachably fixed with an annular outer support ring (35); a compression bolt (36) is threaded through and screwed onto the outer support ring (35) from left to right; the second axial compensation assembly includes a plurality of second sealing rings (38) and an annular compression ring (37) sleeved on the inner support tube (14); the second sealing ring (38) is located to the right of the compression ring (37); the right end of the compression bolt (36) abuts against the compression ring (37); the compression ring (37) abuts against the second sealing ring (38) on its right side. The left end of the limiting tube (32) is formed with a plurality of connecting slots (320); the outer support ring (35) is formed with a plurality of connecting holes with left and right openings; the part between an adjacent pair of connecting holes mates with the connecting slots (320); a connecting bolt is radially screwed onto the outer cylindrical surface of the outer support ring (35); the inner end of the connecting bolt is screwed onto the limiting tube (32); The periphery of the fixing plate (12) is fitted with an annular inner sealing ring (39); the inner cylindrical surface of the inner sealing ring (39) is formed with an annular groove-shaped insertion groove that mates with the fixing plate (12); A ring-shaped left frame is formed on the outer cylindrical surface of the limiting tube (32); a ring-shaped right frame is formed on the outer cylindrical surface of the middle part of the segment tube body (21); a skin (50) is connected between the outer ends of the right frame and the left frame; a heat insulation cotton (40) is provided in the cavity between the left limiting component (30), the sliding plate (22), the segment tube body (21), the right frame and the skin (50); a heat insulation cotton (40) is provided between the outer ends of the right frame and the left frame. A plurality of pressure strips (60) and a plurality of pressure plate bolts (61) are provided; the pressure strips (60) press down on the skin (50); the pressure plate bolts (61) on the left frame side pass through the pressure strips (60), the skin (50) and the left frame from the outside to the inside and are screwed with skin connecting nuts (62); the pressure plate bolts (61) on the right frame side pass through the pressure strips (60), the skin (50) and the right frame from the outside to the inside and are screwed with skin connecting nuts (62).

2. The chimney expansion joint according to claim 1, characterized in that: A fixed flange (26) is formed on the outer cylindrical surface of the right end of the segment pipe body (21); a gland flange (81) is formed on the outer cylindrical surface of the left end of the outlet pipe (80); the outer diameter of the outlet pipe (80) is equal to the inner diameter of the segment pipe body (21) and the left end of the outlet pipe (80) is inserted into the right end opening of the segment pipe body (21); the first axial compensation assembly includes several left and right distributed first sealing rings (90) and several first axial compensation bolts (100); the first sealing rings (90) are sleeved on the outlet pipe (80) and located inside the fixed flange (26); the left end of the gland flange (81) is inserted into the right end opening of the fixed flange (26); the first axial compensation bolts (100) pass through the gland flange (81) and the fixed flange (26) in the left and right directions and are screwed with first axial compensation nuts (101).

3. The chimney expansion joint according to claim 2, characterized in that: The fixed flange (26) includes a cylindrical fixed flange seat (261) welded to the outer cylindrical surface of the main body of the pipe section (21); a cylindrical fixed flange ring (262) is welded to the right end of the fixed flange seat (261); the gland flange (81) includes a cylindrical gland flange seat (811) welded to the outer cylindrical surface of the outlet pipe (80); a cylindrical gland flange ring (812) is welded to the right end of the gland flange seat (811); the outer diameter of the gland flange seat (811) is the same as the inner diameter of the fixed flange seat (261); the first axial compensation bolt (100) passes through the fixed flange ring (262) and the gland flange ring (812) in the left and right directions.

4. The chimney expansion joint according to claim 1, characterized in that: The limiting tube (32) and the fixing plate (12) are welded together as one unit.

5. A chimney expansion joint according to claim 1, characterized in that: The outer ends of the left and right frames are provided with a number of L-shaped ear plates (72) evenly distributed around the circumference; the ear plates (72) are formed with connecting holes; the ear plates (72) on the left and right sides correspond one to one and the pair of ear plates (72) facing each other are provided with transport rods (70); the two ends of the transport rods (70) are respectively screwed with a pair of limiting nuts (71); the pair of limiting nuts (71) on the same side clamp the ear plates (72) on the corresponding side.

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