High temperature expansion joints

Abstract

The present invention discloses a high-temperature expansion joint, which includes: a pipe assembly, a bellows assembly and a pull rod assembly. The pipe assembly has a filling portion and an expansion joint. The filling portion is filled with refractory material. The expansion joint includes a first annular segment, a second annular segment and an annular connecting segment. The first annular segment is filled with a first thermal insulation member, and the second annular segment is filled with a second thermal insulation member. The bellows assembly is connected to the pipe assembly. The bellows assembly and the pipe assembly define a thermal insulation filler cavity. The thermal insulation filler cavity surrounds the expansion joint. The thermal insulation filler cavity is filled with a third thermal insulation member. The pull rod assembly is connected to the bellows assembly. The high-temperature expansion joint of the embodiment of the present invention not only absorbs the thermal displacement generated by the hot air duct system, but also improves the reliability and stability of the internal insulation of the pipe assembly, ensures the sealing of the expansion joint, and thus reduces the surface temperature of the bellows assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of hot air pipeline equipment, in particular to a high-temperature expansion joint. Background Art

[0002] Blast furnace ironmaking is a crucial step in steel production. During the blast furnace smelting process, a blower propels hot air from hot blast furnaces through hot blast ducts into the blast furnace. At high temperatures, this hot air combusts with the carbon in the coke to produce carbon monoxide, which reduces the iron oxides in the ore to molten iron. Blast furnace smelting requires a continuous supply of hot air at sufficiently high temperatures. To ensure continuous blast furnace ironmaking, a single blast furnace is typically equipped with three or four hot blast furnaces, which operate in alternating cycles. Blowers then transport the hot air from these furnaces through hot blast ducts. These multiple hot blast furnaces, supplying air to the blast furnace, create a complex system of high-temperature, high-pressure hot air ducts.

[0003] To absorb the thermal expansion of hot air ducts, expansion joints are installed on the hot air branch pipes, hot air main pipes, and hot air main pipes. After the expansion joints are welded to the pipes, the pipes are sprayed with refractory coatings, refractory bricks are laid, and expansion joints are installed on the refractory bricks. Expansion joints are prone to cracking, loss of elasticity, and ceramicization in long-term high-temperature environments. This can cause hot air to pass through the expansion joints and into the bellows of the expansion joints, leading to high temperatures and redness in the pipes or bellows, cracking, air leakage, and even accidents.

[0004] At the same time, the expansion joint is the weakest link in the pipeline system, and the probability of problems is high, because the internal insulation structure of the entire expansion joint is constructed at the same time as the pipeline. In the relevant technology, there are two main methods: replacement and coating. Replacing the expansion joint can completely solve the problem of expansion joint failure, but the replacement requires dismantling the internal refractory structure, re-welding the expansion joint, and then re-constructing the internal insulation structure and baking it. The construction time is long and has a great impact on blast furnace production. Coating only solves the problem of leakage, but if the condition of the pipeline lining continues to deteriorate, the temperature of the coated expansion joint will also fail due to excessive temperature.

[0005] Especially for the corrugated expansion joint on the hot blast branch pipe of the blast furnace hot blast stove, due to the frequent opening and closing of the hot blast stove, the wind temperature in the hot blast branch pipe fluctuates greatly, which can easily damage the refractory bricks in the hot blast branch pipe. Especially when the radial displacement of the hot blast branch pipe expansion joint is large, it will cause the hot blast branch pipe expansion joint to be damaged and leak air, and then production needs to be stopped to repair or replace the damaged hot blast branch pipe expansion joint. During the repair, the refractory bricks need to be removed to complete the welding of cracks and holes, and then the refractory bricks need to be re-laid. The work efficiency is extremely low and the maintenance time is long, causing economic losses to the company due to shutdown. Summary of the Invention

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, an embodiment of the present invention provides a high-temperature expansion joint that is safe, reliable, and easy to maintain.

[0008] The high-temperature expansion joint of an embodiment of the present invention includes: a connecting pipe assembly, a bellows assembly and a pull rod assembly, the connecting pipe assembly has a filling portion and an expansion joint, the filling portion is filled with refractory material, the expansion joint includes a first annular segment and a second annular segment spaced apart along a first direction and an annular connecting segment connecting the first annular segment and the second annular segment, the outer end of the first annular segment is flush with the outer circumferential wall of the connecting pipe assembly, the first annular segment is filled with a first thermal insulation member, the inner end of the second annular segment is flush with the inner circumferential wall of the connecting pipe assembly, the second annular segment is filled with a second thermal insulation member, the bellows assembly is connected to the connecting pipe assembly, the bellows assembly and the connecting pipe assembly define a thermal insulation filler cavity, the thermal insulation filler cavity surrounds the expansion joint, the thermal insulation filler cavity is filled with a third thermal insulation member, and the pull rod assembly is connected to the bellows assembly.

[0009] The high-temperature expansion joint of the embodiment of the present invention, through the refractory buffer mud, stainless steel wire mesh wrapped insulation fiber and ceramic fiber blanket arranged in sequence from the inside to the outside, not only absorbs the thermal displacement generated by the hot air duct system, but also improves the reliability and stability of the internal insulation of the take-over assembly, ensures the sealing of the expansion joint position, and thus reduces the surface temperature of the bellows assembly.

[0010] In some embodiments, the connecting pipe assembly includes an inlet connecting pipe, a first inlet casting ring, an inlet lining pipe, a second inlet casting ring, an outlet connecting pipe, a first outlet casting ring, an outlet lining pipe and a second outlet casting ring; the first end of the inlet connecting pipe is connected to the outer peripheral wall of the first inlet casting ring, the inner peripheral wall of the first inlet casting ring is connected to the first end of the inlet lining pipe, and the second end of the inlet lining pipe is connected to the outer peripheral wall of the second inlet casting ring; the first end of the outlet connecting pipe is connected to the outer peripheral wall of the first outlet casting ring, the inner peripheral wall of the first outlet casting ring is connected to the first end of the outlet lining pipe, and the second end of the outlet lining pipe is connected to the outer peripheral wall of the second outlet casting ring; the first inlet casting ring, the inlet lining pipe, the second inlet casting ring, the first outlet casting ring, the outlet lining pipe and the second outlet casting ring jointly define the connecting seam.

[0011] In some embodiments, the first inlet casting ring, the first outlet casting ring and the first portion of the inlet liner pipe jointly define the first annular segment, the second inlet casting ring, the second outlet casting ring and the first portion of the outlet liner pipe jointly define the second annular segment, and the second portion of the inlet liner pipe and the second portion of the outlet liner pipe define the annular connecting segment.

[0012] In some embodiments, the connecting pipe assembly also includes a dust-blocking ring plate, which is located in the second annular segment. The dust-blocking ring plate is respectively connected to the second inlet casting ring and the second outlet casting ring. The second thermal insulation component is filled between the dust-blocking ring plate and the outlet liner pipe.

[0013] In some embodiments, within the plane where the central axis of the dust-blocking ring plate is located, the cross-section of the dust-blocking ring plate is arc-shaped, the outer peripheral wall of the dust-blocking ring plate is convex, and the inner peripheral wall of the dust-blocking ring plate is concave.

[0014] In some embodiments, a first dust ring is provided in the annular connecting section.

[0015] In some embodiments, the filling portion includes an inlet filling section and an outlet filling section, the inlet connecting pipe, the first inlet casting ring, the inlet lining pipe and the second inlet casting ring jointly define the inlet filling section, and a plurality of first anchor nails are provided in the inlet filling section, the outlet connecting pipe, the first outlet casting ring, the outlet lining pipe and the second outlet casting ring jointly define the outlet filling section, and a plurality of second anchor nails are provided in the outlet filling section.

[0016] In some embodiments, the inlet pipe has an inlet reserved connection section, which is located on the side of the inlet filling section away from the outlet filling section, and the outlet pipe has an outlet reserved connection section, which is located on the side of the outlet filling section away from the inlet filling section.

[0017] In some embodiments, the bellows assembly includes an inlet ring plate and an inlet frame high pipe sleeved on the inlet pipe, an outlet ring plate and an outlet frame high pipe sleeved on the outlet pipe, a guide tube sleeved on the inlet pipe and the outlet pipe, and a bellows sleeved on the inlet frame high pipe and the outlet frame high pipe; the inlet pipe, the inlet ring plate, the inlet frame high pipe, the bellows, the outlet pipe, the outlet ring plate, the outlet frame high pipe and the guide tube jointly define the thermal insulation filler cavity; a second dust ring is provided between the inner circumferential wall of the guide tube and the outer circumferential wall of the inlet pipe, and a gasket is provided between the inner circumferential wall of the guide tube and the outer circumferential wall of the outlet pipe.

[0018] In some embodiments, the pull rod assembly includes an inlet ear plate, an outlet ear plate, a stressed screw and a plurality of nuts, the inlet ear plate is connected to the inlet ring plate, the outlet ear plate is connected to the outlet ring plate, the stressed screw passes through the jack of the inlet ear plate and the jack of the outlet ear plate in sequence along a first direction, the nut is assembled on the stressed screw, and the inlet ear plate and / or the outlet ear plate are located between any two of the nuts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a high-temperature expansion joint according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] Inlet pipe 11, first inlet casting ring 12, inlet lining pipe 13, second inlet casting ring 14, first anchor nail 15,

[0022] Outlet pipe 21, first outlet casting ring 22, outlet lining pipe 23, second outlet casting ring 24, second anchor nail 25,

[0023] Inlet ring plate 31, inlet frame tube 32, outlet ring plate 33, outlet frame tube 34, guide tube 35, bellows 36, inlet ear plate 41, outlet ear plate 42, force screw 43, nut 44,

[0024] Refractory material 51 , first thermal insulation member 52 , second thermal insulation member 53 , third thermal insulation member 54 , dust-blocking ring plate 55 , first dustproof ring 56 , second dustproof ring 57 , and backing plate 58 . DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] The following describes a high-temperature expansion joint according to an embodiment of the present invention with reference to the accompanying drawings.

[0027] like Figure 1As shown, the high-temperature expansion joint of an embodiment of the present invention includes: a pipe assembly, a bellows 36 assembly and a tie rod assembly. The pipe assembly has a filling portion and an expansion joint, the filling portion is filled with refractory material 51, and the expansion joint includes a first annular segment and a second annular segment spaced apart along a first direction, and an annular connecting segment connecting the first annular segment and the second annular segment. The outer end of the first annular segment is flush with the outer circumferential wall of the pipe assembly, and the first annular segment is filled with a first thermal insulation member 52. The inner end of the second annular segment is flush with the inner circumferential wall of the pipe assembly, and the second annular segment is filled with a second thermal insulation member 53. The bellows 36 assembly is connected to the pipe assembly, and the bellows 36 assembly and the pipe assembly define a thermal insulation filler cavity, the thermal insulation filler cavity surrounds the expansion joint, and the thermal insulation filler cavity is filled with a third thermal insulation member 54. The tie rod assembly is connected to the bellows 36 assembly.

[0028] It should be understood that the pipe assembly of the high-temperature expansion joint in the embodiment of the present invention is used to connect the hot air pipes in the hot air duct system, and the thermal expansion displacement between the hot air pipes is absorbed by the bellows 36 assembly, and the pull rod assembly is used to adjust the compensation amount of the bellows 36 assembly.

[0029] Expansion joints in the prior art are prone to problems at the expansion joint, which can cause hot air to flow through the expansion joint and into the bellows 36, leading to high temperatures and redness in the bellows 36, and even cracking, leakage, and even accidents. Therefore, the high-temperature expansion joint in the embodiment of the present invention has a multi-stage expansion joint design and elastic insulation installed within the expansion joint and the insulation filler cavity. This not only absorbs the thermal displacement generated by the hot air pipe, but also acts as an insulating material to reduce the external surface temperature of the bellows 36 assembly.

[0030] Alternatively, as Figure 1 As shown, the filling portion is located within the pipe assembly. Refractory material 51 is filled into the filling portion to reduce the outer surface temperature of the pipe assembly during hot air flow. Those skilled in the art are aware that refractory material 51 is a thermal insulation castable, which is prepared by mixing, adding water, pouring, and drying after formulating.

[0031] Alternatively, as Figure 1 As shown, from left to right are the first annular segment, the annular connecting segment and the second annular segment, and from inside to outside are the second annular segment, the first annular segment and the heat-insulating filler cavity.

[0032] Specifically, the first thermal insulator 52 is made of stainless steel wire mesh wrapped with thermal insulation fibers, consisting of a 0.25 mm thick steel wire mesh wrapped around a 25 mm thick ceramic fiber blanket with a temperature resistance of 1500°C. The second thermal insulator 53 is a dried refractory buffer slurry, which is compressible and heat-resistant up to 1500°C. The third thermal insulator 54 is composed of a 25 mm thick ceramic fiber blanket with a temperature resistance of 1500°C.

[0033] Therefore, the high-temperature expansion joint of the embodiment of the present invention, through the refractory buffer mud, stainless steel wire mesh wrapped insulation fiber and ceramic fiber blanket arranged in sequence from the inside to the outside, not only absorbs the thermal displacement generated by the hot air pipe system, but also improves the reliability and stability of the internal insulation of the connecting pipe assembly, ensures the sealing of the expansion joint position, and thus reduces the surface temperature of the bellows 36 assembly.

[0034] In some embodiments, as Figure 1 As shown, the pipe assembly includes an inlet pipe 11 , a first inlet casting ring 12 , an inlet lining pipe 13 , a second inlet casting ring 14 , an outlet pipe 21 , a first outlet casting ring 22 , an outlet lining pipe 23 and a second outlet casting ring 24 .

[0035] Among them, such as Figure 1 As shown, the central axes of the inlet pipe 11, the first inlet casting ring 12, the inlet lining pipe 13, the second inlet casting ring 14, the outlet pipe 21, the first outlet casting ring 22, the outlet lining pipe 23 and the second outlet casting ring 24 are all arranged in the left-right direction and are coaxial.

[0036] The inlet pipe 11 is located to the left of the outlet pipe 21, and the inlet pipe 11 and the outlet pipe 21 are spaced apart in the left-right direction. The first inlet casting ring 12 is located to the left of the first outlet casting ring 22, and the first inlet casting ring 12 and the first outlet casting ring 22 are in the left-right direction. The second inlet casting ring 14 is located to the left of the second outlet casting ring 24, and the second inlet casting ring 14 and the second outlet casting ring 24 are spaced apart in the left-right direction. The outlet liner pipe 23 is located outside the inlet liner pipe 13, and the outlet liner pipe 23 and the inlet liner pipe 13 are spaced apart in the inside-out direction. From the inside to the outside, the inlet liner pipe 13 and the outlet liner pipe 23 have some overlapping parts.

[0037] Alternatively, as Figure 1 As shown, the right end of the inlet pipe 11 is connected to the outer peripheral wall of the first inlet casting ring 12, the inner peripheral wall of the first inlet casting ring 12 is connected to the left end of the inlet liner pipe 13, and the right end of the inlet liner pipe 13 is connected to the outer peripheral wall of the second inlet casting ring 14.

[0038] The left end of the outlet pipe 21 is connected to the outer peripheral wall of the first outlet casting ring 22 , the inner peripheral wall of the first outlet casting ring 22 is connected to the left end of the outlet liner pipe 23 , and the right end of the outlet liner pipe 23 is connected to the outer peripheral wall of the second outlet casting ring 24 .

[0039] Thus, the spaces between the first inlet casting ring 12 , the inlet liner pipe 13 , the second inlet casting ring 14 , the first outlet casting ring 22 , the outlet liner pipe 23 and the second outlet casting ring 24 collectively define a connection seam.

[0040] Specifically, if Figure 1As shown, the first inlet casting ring 12, the first outlet casting ring 22 and the first part of the inlet liner pipe 13 (referring to the left half of the inlet liner pipe 13) together define a first annular segment, the second inlet casting ring 14, the second outlet casting ring 24 and the first part of the outlet liner pipe 23 (referring to the right half of the outlet liner pipe 23) together define a second annular segment, and the second part of the inlet liner pipe 13 (referring to the right half of the inlet liner pipe 13) and the second part of the outlet liner pipe 23 (referring to the left half of the outlet liner pipe 23) define an annular connecting segment.

[0041] Optionally, the inlet pipe 11, inlet liner 13, outlet pipe 21, and outlet liner 23 are formed from steel plate blanking, coiling, and welding, and the first inlet casting ring 12, second inlet casting ring 14, first outlet casting ring 22, and second outlet casting ring 24 are also formed from steel plate blanking. Furthermore, the inlet pipe 11 and outlet pipe 21 have the same structural dimensions.

[0042] In some embodiments, as Figure 1 As shown, the connecting pipe assembly also includes a dust-blocking ring plate 55, which is located in the second annular segment. The dust-blocking ring plate 55 is respectively connected to the second inlet casting ring 14 and the second outlet casting ring 24. The second thermal insulation component 53 is filled between the dust-blocking ring plate 55 and the outlet liner pipe 23.

[0043] Alternatively, as Figure 1 As shown, the central axis of the dust-blocking ring plate 55 is coaxial with the central axis of the outlet pipe 21. Along the radial direction of the dust-blocking ring plate 55, from the inside to the outside, the second annular section between the outer peripheral wall of the dust-blocking ring plate 55 and the right half of the outlet liner pipe 23 can be filled with the second thermal insulation member 53. The left end of the dust-blocking ring plate 55 is connected to the right wall surface of the second inlet casting ring 14, and the right end of the dust-blocking ring plate 55 is connected to the left wall surface of the second outlet casting ring 24.

[0044] Furthermore, the dust-blocking ring plate 55 is formed by cutting and processing a 3 mm thick 304 stainless steel plate, and the dust-blocking ring plate 55 can be axially deformed.

[0045] Specifically, if Figure 1 As shown, the cross-section of dust-blocking plate 55 is arcuate within the plane of its central axis. The outer circumferential wall of dust-blocking plate 55 is convex, while the inner circumferential wall of dust-blocking plate 55 is concave. It is understood that dust-blocking plate 55 seals the inner end of the second annular segment.

[0046] In some embodiments, as Figure 1As shown, a first dust ring 56 is provided in the annular connecting section. The outer peripheral wall of the first dust ring 56 abuts against the inner peripheral wall of the outlet inner liner 23, and the inner peripheral wall of the first dust ring 56 abuts against the outer peripheral wall of the inlet inner liner 13. The first dust ring 56 is used to seal the annular connecting section. Even if the dust blocking ring plate 55 seal leaks, the first dust ring 56 can also prevent dust from flowing from the second annular section into the first annular section.

[0047] In some embodiments, as Figure 1 As shown, the filling section includes an inlet filling section and an outlet filling section. The inlet pipe 11, the first inlet casting ring 12, the inlet liner 13, and the second inlet casting ring 14 collectively define the inlet filling section, within which a plurality of first anchoring pins 15 are provided. The outlet pipe 21, the first outlet casting ring 22, the outlet liner 23, and the second outlet casting ring 24 collectively define the outlet filling section, within which a plurality of second anchoring pins 25 are provided.

[0048] It can be understood that the inlet filling section and the outlet filling section are both filled with refractory material 51, the refractory material 51 in the inlet filling section is flush with the inner circumferential wall of the second inlet casting ring 14, and the refractory material 51 in the outlet filling section is flush with the inner circumferential wall of the second outlet casting ring 24.

[0049] Alternatively, as Figure 1 As shown, the first anchoring nail 15 is connected to the inner circumferential wall of the inlet pipe 11 to anchor the refractory material 51 in the inlet filling section. The second anchoring nail 25 is connected to the inner circumferential wall of the outlet pipe 21 to anchor the refractory material 51 in the outlet filling section. Therefore, the high-temperature expansion joint of this embodiment of the present invention is already filled with refractory material 51 in the pipe assembly upon shipment and has been baked at 350°C for 72 hours. Therefore, it can be directly assembled on-site in the hot air duct system, significantly shortening the replacement cycle of the high-temperature expansion joint of this embodiment of the present invention.

[0050] In some embodiments, as Figure 1 As shown, the inlet pipe 11 has an inlet reserved connection section, which is located on the side of the inlet filling section away from the outlet filling section (as shown in FIG. Figure 1 The outlet pipe 21 has an outlet reserved connection section, which is located on the side of the outlet filling section away from the inlet filling section (such as Figure 1 to the right of the middle outlet filling section).

[0051] Alternatively, as Figure 1As shown, the distance a of the reserved inlet connection section along the axial direction of the inlet pipe 11 is 10 mm, and the distance b of the reserved outlet connection section along the axial direction of the inlet pipe 11 is 10 mm. In other words, after the refractory material 51 is installed in the inlet pipe 11 and the outlet pipe 21, a 10 mm gap is reserved between the refractory material 51 in the inlet pipe 11 and the left end of the inlet pipe 11, and a 10 mm gap is reserved between the refractory material 51 in the outlet pipe 21 and the right end of the outlet pipe 21, to facilitate subsequent installation on site of the hot air duct system.

[0052] In some embodiments, as Figure 1 As shown, the bellows 36 assembly includes an inlet ring plate 31 and an inlet frame tube 32 mounted on the inlet pipe 11, an outlet ring plate 33 and an outlet frame tube 34 mounted on the outlet pipe 21, a guide tube 35 mounted on the inlet pipe 11 and the outlet pipe 21, and a bellows 36 mounted on the inlet frame tube 32 and the outlet frame tube 34.

[0053] Alternatively, as Figure 1 As shown, the inner circumferential wall of the inlet ring plate 31 is connected to the outer circumferential wall of the inlet pipe 11, and the left end of the inlet frame tube 32 is connected to the outer circumferential wall of the inlet ring plate 31. The inner circumferential wall of the outlet ring plate 33 is connected to the outer circumferential wall of the outlet pipe 21, and the right end of the outlet frame tube 34 is connected to the outer circumferential wall of the outlet ring plate 33. The left end of the bellows 36 is connected to the right end of the inlet frame tube 32, and the right end of the bellows 36 is connected to the left end of the outlet frame tube 34.

[0054] The guide tube 35 is sleeved on the outside of the first annular segment. A gasket 58 is provided between the inner circumference of the guide tube 35 and the outer circumference of the outlet pipe 21. The gasket 58 is connected to the outer circumference of the outlet pipe 21 and the inner circumference of the guide tube 35. A second dust ring 57 is provided between the inner circumference of the guide tube 35 and the outer circumference of the inlet pipe 11.

[0055] Thus, the inlet pipe 11 , the inlet ring plate 31 , the inlet frame tube 32 , the bellows 36 , the outlet pipe 21 , the outlet ring plate 33 , the outlet frame tube 34 and the guide tube 35 together define an annular heat-insulating filler cavity.

[0056] In addition, the inlet ring plate 31 and the outlet ring plate 33 have identical dimensions, as do the inlet and outlet frame tubes 32 and 34. The inlet and outlet ring plates 31 and 33 are machined from blanked steel sheets, while the inlet and outlet frame tubes 32, 34, and guide tube 35 are machined from blanked steel sheets, rolled, and welded together. The bellows 36 is formed by blanking stainless steel sheets, welding them together, and then placing them in a dedicated forming mold. The bellows 36 can be constructed in a duplex configuration.

[0057] In some embodiments, as Figure 1As shown, the tie rod assembly includes an inlet lug plate 41, an outlet lug plate 42, a force screw 43, and a plurality of nuts 44. The inlet lug plate 41 is connected to the inlet ring plate 31, and the outlet lug plate 42 is connected to the outlet ring plate 33. The force screw 43 passes through the insertion holes of the inlet lug plate 41 and the insertion holes of the outlet lug plate 42 in sequence along a first direction. The nuts 44 are assembled on the force screw 43, and the inlet lug plate 41 and / or the outlet lug plate 42 are located between any two nuts 44.

[0058] Specifically, if Figure 1 As shown, there are four nuts 44 , two of which are used to clamp the inlet lug plate 41 , and the other two nuts 44 are used to clamp the outlet lug plate 42 .

[0059] Furthermore, there are multiple tie rod assemblies, and the multiple tie rod assemblies are distributed at intervals along the circumference of the inlet ring plate 31 or the outlet ring plate 33 .

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 therefore should not be understood as limiting the present invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0065] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A high temperature expansion joint, characterized in that: include: A pipe assembly, the pipe assembly comprising a filling portion and an expansion joint, the filling portion being filled with a refractory material, the expansion joint comprising a first annular segment and a second annular segment spaced apart along a first direction, and an annular connecting segment connecting the first annular segment and the second annular segment, the outer end of the first annular segment being flush with the outer circumferential wall of the pipe assembly, the first annular segment being filled with a first thermal insulation member, the inner end of the second annular segment being flush with the inner circumferential wall of the pipe assembly, and the second annular segment being filled with a second thermal insulation member; a bellows assembly connected to the connecting pipe assembly, the bellows assembly and the connecting pipe assembly defining a heat-insulating filler cavity, the heat-insulating filler cavity surrounding the expansion joint, the heat-insulating filler cavity being filled with a third heat-insulating member; a pull rod assembly connected to the bellows assembly; The pipe assembly includes an inlet pipe, a first inlet casting ring, an inlet lining pipe, a second inlet casting ring, an outlet pipe, a first outlet casting ring, an outlet lining pipe and a second outlet casting ring; The first end of the inlet pipe is connected to the outer peripheral wall of the first inlet casting ring, the inner peripheral wall of the first inlet casting ring is connected to the first end of the inlet liner pipe, and the second end of the inlet liner pipe is connected to the outer peripheral wall of the second inlet casting ring; The first end of the outlet pipe is connected to the outer peripheral wall of the first outlet casting ring, the inner peripheral wall of the first outlet casting ring is connected to the first end of the outlet liner pipe, and the second end of the outlet liner pipe is connected to the outer peripheral wall of the second outlet casting ring; The first inlet casting ring, the inlet liner, the second inlet casting ring, the first outlet casting ring, the outlet liner and the second outlet casting ring together define the expansion joint; the first inlet casting ring, the first outlet casting ring and the first portion of the inlet liner together define the first annular segment; the second inlet casting ring, the second outlet casting ring and the first portion of the outlet liner together define the second annular segment; the second portion of the inlet liner and the second portion of the outlet liner define the annular connecting segment; The filling portion includes an inlet filling section and an outlet filling section. The inlet connecting pipe, the first inlet casting ring, the inlet lining pipe and the second inlet casting ring jointly define the inlet filling section, and a plurality of first anchoring nails are provided in the inlet filling section. The outlet connecting pipe, the first outlet casting ring, the outlet lining pipe and the second outlet casting ring jointly define the outlet filling section, and a plurality of second anchoring nails are provided in the outlet filling section.

2. The high temperature expansion joint according to claim 1, characterized in that: The connecting pipe assembly also includes a dust-blocking ring plate, which is located in the second annular segment and is respectively connected to the second inlet casting ring and the second outlet casting ring. The second thermal insulation component is filled between the dust-blocking ring plate and the outlet liner pipe.

3. The high temperature expansion joint according to claim 2, characterized in that: In the plane where the central axis of the dust-blocking ring plate is located, the cross-section of the dust-blocking ring plate is arc-shaped, the outer peripheral wall of the dust-blocking ring plate is a convex surface, and the inner peripheral wall of the dust-blocking ring plate is a concave surface.

4. The high temperature expansion joint according to claim 1, characterized in that: A first dustproof ring is provided in the annular connecting section.

5. The high temperature expansion joint according to claim 1, characterized in that: The inlet pipe has an inlet reserved connection section, which is located on the side of the inlet filling section away from the outlet filling section. The outlet pipe has an outlet reserved connection section, which is located on the side of the outlet filling section away from the inlet filling section.

6. The high temperature expansion joint according to claim 1, characterized in that: The bellows assembly includes an inlet ring plate and an inlet frame tube sleeved on the inlet pipe, an outlet ring plate and an outlet frame tube sleeved on the outlet pipe, a guide tube sleeved on the inlet pipe and the outlet pipe, and a bellows sleeved on the inlet frame tube and the outlet frame tube; The inlet pipe, the inlet ring plate, the inlet frame tube, the bellows, the outlet pipe, the outlet ring plate, the outlet frame tube and the guide tube jointly define the heat-insulating filler cavity; A second dustproof ring is provided between the inner peripheral wall of the guide cylinder and the outer peripheral wall of the inlet pipe, and a gasket is provided between the inner peripheral wall of the guide cylinder and the outer peripheral wall of the outlet pipe.

7. The high temperature expansion joint according to claim 6, characterized in that: The pull rod assembly includes an inlet ear plate, an outlet ear plate, a stressed screw and multiple nuts. The inlet ear plate is connected to the inlet ring plate, and the outlet ear plate is connected to the outlet ring plate. The stressed screw passes through the jack of the inlet ear plate and the jack of the outlet ear plate in sequence along a first direction. The nut is assembled on the stressed screw, and the inlet ear plate and / or the outlet ear plate are located between any two of the nuts.

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