High temperature expansion joint

Abstract

The application discloses a high-temperature expansion joint, which comprises a fixed pipe section, a movable pipe section, a connecting part and a temperature reducing assembly. The fixed pipe section comprises a first pipe section and a second pipe section, the movable pipe section is connected between the first pipe section and the second pipe section, and a set gap is arranged between the movable pipe section and the fixed pipe section to adapt to thermal deformation of the high-temperature pipeline. The connecting part is arranged in the set gap and is sealingly connected between the fixed pipe section and the movable pipe section, and the length of the connecting part is adjustable to adapt to width change of the set gap. The temperature reducing assembly is arranged in any one of the fixed pipe section and the movable pipe section, and the temperature reducing assembly is connected with the connecting part and is suitable for reducing the working temperature of the connecting part to prevent the connecting part from being structurally failed due to heat. The high-temperature expansion joint has the advantages of high structural reliability and long operation cycle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline equipment, in particular to a high-temperature expansion joint. BACKGROUND

[0002] The expansion joint refers to a flexible element capable of effectively compensating for axial deformation. The high-temperature expansion joint has large axial flexibility and is easy to deform, can compensate for the thermal expansion difference of high-temperature pipelines and shells due to different wall temperatures, reduce the axial load of high-temperature pipelines, and thus reduce the thermal stress of high-temperature pipelines, tube sheets and shells, thereby avoiding strength damage, instability damage and pull-out damage. The high-temperature expansion joint in the related art is prone to problems of pipe coking or structural failure. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a high-temperature expansion joint having the advantages of high structural reliability and long operation cycle.

[0004] The high-temperature expansion joint of the present application comprises a fixed pipe section and a movable pipe section. The fixed pipe section comprises a first pipe section and a second pipe section. The movable pipe section is connected between the first pipe section and the second pipe section, and a set gap is provided between the movable pipe section and the fixed pipe section to accommodate thermal deformation of the high-temperature pipeline. A connecting portion is provided in the set gap and is sealingly connected between the fixed pipe section and the movable pipe section. The length of the connecting portion is adjustable to accommodate changes in the width of the set gap. A cooling assembly is provided in either the fixed pipe section or the movable pipe section. The cooling assembly is connected to the connecting portion and is adapted to reduce the operating temperature of the connecting portion to prevent structural failure of the connecting portion due to heat.

[0005] The high-temperature expansion joint of the present application has the advantages of high structural reliability and long operation cycle.

[0006] In some embodiments, the connecting portion comprises a first portion, a second portion and a bellows. The first portion is provided at one end of the fixed pipe section and extends along the circumference of the fixed pipe section. The second portion is provided at one end of the movable pipe section and extends along the circumference of the movable pipe section. The first portion is fitted in the second portion and is movable relative to the second portion. The bellows is provided on the outer circumferential side of the first portion and is connected between the fixed pipe section and the movable pipe section to close the gap between the first portion and the second portion.

[0007] In some embodiments, the first part is made of thermal insulation material, one end of the first part is connected to the inner wall of the fixed pipe section, the other end of the first part extends along the axial direction of the movable pipe section to the outside of the fixed pipe section, and a first gap is formed between the first part and one end of the fixed pipe section, and part of the second part is fitted in the first gap.

[0008] In some embodiments, one end of the second part is connected to the inner wall of the movable pipe section, the other end of the second part extends along the axial direction of the movable pipe section to the outer circumferential side of the first part and fits the first part in the second part, and a second gap is formed between the second part and the inner wall of the movable pipe section to fit the second part inside the inner wall of the fixed pipe section.

[0009] In some embodiments, the cooling assembly is arranged in the movable pipe section, the cooling assembly is in communication with the second gap and is adapted to introduce cooling medium into the second gap to reduce the temperature of the bellows.

[0010] In some embodiments, the cooling assembly includes an annular pipe and a plurality of air inlet pipes, the annular pipe is sleeved on the outer circumferential side of the movable pipe section and extends along the outer circumferential side of the movable pipe section, the plurality of air inlet pipes are connected between the annular pipe and the movable pipe section to communicate the annular pipe and the second gap, and the plurality of air inlet pipes are uniformly spaced along the outer circumferential side of the movable pipe section.

[0011] In some embodiments, the annular pipe includes an air inlet valve and a liquid outlet valve, the air inlet valve is connected to the upper end of the annular pipe for cooling medium to flow into the annular pipe, and the liquid outlet valve is arranged at the lower end of the annular pipe to adapt to discharge waste liquid in the annular pipe.

[0012] In some embodiments, a thermal insulation layer is arranged in the movable pipe section, the thermal insulation layer is arranged on the inner wall of the movable pipe section to reduce heat loss in the movable pipe section, the thermal insulation layer has an annular protrusion near the end of the fixed pipe section, and at least part of the first part is fitted in the annular protrusion to reduce heat loss between the first part and the thermal insulation layer.

[0013] In some embodiments, the high-temperature expansion joint further includes a linkage assembly, the linkage assembly is arranged in the movable pipe section, one end of the linkage assembly is connected to the first pipe section, the other end of the linkage assembly is connected to the second pipe section, the length of the linkage assembly is adjustable, and the spacing between the first pipe section and the movable pipe section and the spacing between the second pipe section and the movable pipe section are the same.

[0014] In some embodiments, the high-temperature expansion joint further comprises a pull rod, one end of the pull rod is arranged at the first pipe segment, the other end of the pull rod is arranged at the second pipe segment, and the movable pipe segment is sleeved on the pull rod at least partially, so that the movable pipe segment can slide along the length direction of the pull rod. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of a high-temperature expansion joint of an embodiment of the present application.

[0016] Figure 2 is a structural schematic diagram of a high-temperature expansion joint of an embodiment of the present application. Figure 1 is a sectional view at A-A in FIG.

[0017] Figure 3 is a sectional view at A-A in FIG. Figure 1 is a sectional view at A-A in FIG.

[0018] Figure 4 is a structural schematic diagram of a high-temperature expansion joint of an embodiment of the present application.

[0019] REFERENCE SIGNS:

[0020] fixed pipe segment 1; first pipe segment 101; second pipe segment 102;

[0021] movable pipe segment 2; thermal insulation layer 21; annular protrusion 211;

[0022] connecting part 3; first connecting part 301; second connecting part 302; first part 31; second part 32; corrugated pipe 33; first gap 34; second gap 35;

[0023] cooling assembly 4; first assembly 401; second assembly 402; annular pipe 41; air inlet pipe 42; air inlet valve 43; liquid outlet valve 44;

[0024] linkage assembly 5; first connecting position 51; second connecting position 52; third connecting position 53; first segment 501; second segment 502;

[0025] pull rod 6. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0027] The high-temperature expansion joint of the embodiments of the present application is described below in combination with Figure 1 , Figure 2 , Figure 3 and Figure 4

[0028] ​The high-temperature expansion joint comprises a fixed pipe section 1, a movable pipe section 2, a connecting part 3 and a temperature-lowering assembly 4.

[0029] The fixed pipe section 1 comprises a first pipe section 101 and a second pipe section 102, and the movable pipe section 2 is connected between the first pipe section 101 and the second pipe section 102, and a set gap is provided between the movable pipe section 2 and the fixed pipe section 1 to accommodate the thermal deformation of the high-temperature pipeline.

[0030] Specifically, the fixed pipe section 1 comprises a first pipe section 101 and a second pipe section 102, one end of the first pipe section 101 is connected to one end of the high-temperature pipeline, one end of the second pipe section 102 is connected to the other end of the high-temperature pipeline, the movable pipe section 2 is connected between the other end of the first pipe section 101 and the other end of the second pipe section 102 to allow the medium in the high-temperature pipeline to flow between the fixed pipe section 1 and the movable pipe section 2, and a set gap is provided between the fixed pipe section 1 and the movable pipe section 2 to allow the fixed pipe section 1 and the movable pipe section 2 to expand after being heated.

[0031] The connecting part 3 comprises a first connecting part 301 and a second connecting part 302, the movable pipe section 2 is connected to the first pipe section 101 through the first connecting part 301, and the movable pipe section 2 is connected to the second pipe section 102 through the second connecting part 302, when the high-temperature pipeline is heated and expanded, the first pipe section 101 and the second pipe section 102 connected to the high-temperature pipeline move towards the movable pipe section 2, the width of the set gap changes, the two ends of the connecting part 3 are connected to the two ends of the set gap, and the length of the connecting part 3 is adjustable to allow the connecting part 3 to adapt to the change in the width of the set gap after the high-temperature pipeline is heated and deformed.

[0032] The temperature-lowering assembly 4 is arranged in any one of the fixed pipe section 1 and the movable pipe section 2, and the temperature-lowering assembly 4 is connected to the connecting part 3 and is adapted to lower the working temperature of the connecting part 3 to prevent the connecting part 3 from being structurally failed due to heat.

[0033] Specifically, the temperature-lowering assembly 4 is arranged in the movable pipe section 2 and located on the outer circumferential side of the movable pipe section 2, there are two temperature-lowering assemblies 4, and the two temperature-lowering assemblies 4 correspond to the two connecting parts 3 one by one, each temperature-lowering assembly 4 is adapted to lower the temperature of the corresponding connecting part 3 when the high-temperature expansion joint of the embodiment of the present application is working to make the temperature of the connecting part 3 not exceed the safe temperature of the connecting part 3, thereby preventing the connecting part 3 from being structurally failed due to heat or the fluid in the high-temperature pipeline from being sintered on the inner side of the connecting part 3 under high-temperature conditions.

[0034] The high-temperature expansion joint of the embodiment of the present application reduces the temperature of the connecting part 3 of the high-temperature expansion joint of the embodiment of the present application during operation by arranging the cooling assembly 4 on the outer circumferential side of the movable pipe section 2, so that the temperature of the connecting part 3 is not higher than the safety temperature of the connecting part 3, thereby preventing the connecting part 3 from being structurally invalid due to heat or the fluid in the high-temperature pipeline from sintering on the inner side of the connecting part 3, so that the high-temperature expansion joint of the embodiment of the present application can work for a long time in a high-temperature environment, and has the advantages of high structural reliability and long operation cycle.

[0035] In some embodiments, the connecting part 3 includes a first part 31, a second part 32, and a bellows 33, the first part 31 is arranged at one end of the fixed pipe section 1 and extends along the circumference of the fixed pipe section 1, the second part 32 is arranged at one end of the movable pipe section 2 and extends along the circumference of the movable pipe section 2, the first part 31 is fitted in the second part 32 and is movable relative to the second part 32, and the bellows 33 is arranged on the outer circumferential side of the first part 31 and connected between the fixed pipe section 1 and the movable pipe section 2 to close the gap between the first part 31 and the second part 32.

[0036] Specifically, the first part 31 is arranged at one end of the fixed pipe section 1 facing the movable pipe section 2, and the first part 31 extends along the circumference of the fixed pipe section 1, the second part 32 is arranged at one end of the movable pipe section 2 facing the fixed pipe section 1, and the second part 32 extends along the circumference of the movable pipe section 2, the outer diameter of the first part 31 is smaller than the inner diameter of the second part 32, so that at least part of the first part 31 can be fitted in the second part 32.

[0037] The length of the bellows 33 along its axial direction can be adjusted to change the length of the bellows 33, one end of the bellows 33 is sealingly connected to the pipe wall of the fixed pipe section 1, the other end of the bellows 33 is sealingly connected to the pipe wall of the movable pipe section 2, and both the first part 31 and the second part 32 are located in the inner wall of the bellows 33, so that the bellows 33 seals both the first part 31 and the second part 32 inside the bellows 33.

[0038] Therefore, the first part 31 is fitted inside the second part 32, when there is high-temperature fluid in the movable pipe section 2 and the fixed pipe section 1, the high-temperature fluid needs to bypass the first part 31 and the second part 32 to flow to the inside of the bellows 33, which can effectively reduce the temperature of the high-temperature fluid at the bellows 33, and on the other hand, can reduce the disturbance of the connecting part 3 to the high-temperature fluid in the fixed pipe section 1, and reduce the influence of the high-temperature expansion joint of the embodiment of the present application on the high-temperature pipeline.

[0039] In some embodiments, the first part 31 is made of heat-insulating material, one end of the first part 31 is connected to the inner wall of the fixed pipe section 1, the other end of the first part 31 extends along the axial direction of the movable pipe section 2 to the outside of the fixed pipe section 1, and the first part 31 has a first gap 34 between the one end of the first part 31 and the fixed pipe section 1, and part of the second part 32 is fitted in the first gap 34.

[0040] Specifically, the first part 31 is arranged such that the end of the first part 31 extends out of the fixed pipe section 1, and the outer diameter of the first part 31 is smaller than the inner diameter of the fixed pipe section 1, so as to form the first gap 34 between the outer wall of the first part 31 and the inner wall of the fixed pipe section 1, and the second part 32 is fitted in the first gap 34.

[0041] Therefore, the first part 31 made of heat-insulating material can effectively reduce the heat dissipation of the high-temperature fluid in the movable pipe section 2 and the fixed pipe section 1 at the connecting part 3, and reduce the influence of the high-temperature expansion joint on the high-temperature fluid in the high-temperature pipeline. When the high-temperature fluid exists in the movable pipe section 2 and the fixed pipe section 1, the high-temperature fluid needs to bypass the first part 31 to enter the first gap 34, and bypass the end of the second part 32 in the first gap 34 to contact the bellows 33, which reduces the temperature of the high-temperature fluid at the inner wall of the bellows 33, thereby avoiding the sintering of the inner wall of the bellows 33 and reducing the thermal stress at the welding position of the bellows 33.

[0042] In some embodiments, one end of the second part 32 is connected to the inner wall of the movable pipe section 2, the other end of the second part 32 extends along the axial direction of the movable pipe section 2 to the outer circumferential side of the first part 31 and makes the first part 31 fitted in the second part 32, and the second part 32 has a second gap 35 between the inner wall of the movable pipe section 2 and the second part 32 to make the second part 32 fitted inside the inner wall of the fixed pipe section 1.

[0043] Specifically, the second part 32 is a tubular structure, the axis of the second part 32 coincides with the axis of the movable pipe section 2, one end of the second part 32 is connected to the inner wall of the movable pipe section 2, the other end of the second part 32 extends into the first gap 34, and the outer wall surface of the second part 32 has a set interval with the bellows 33, and the outer wall surface of the second part 32 has the second gap 35 with the inner wall surface of the movable pipe section 2.

[0044] Therefore, the second part 32 has intervals with the first part 31, the bellows 33 and the fixed pipe section 1, when the high-temperature fluid exists in the movable pipe section 2 and the fixed pipe section 1, the high-temperature fluid needs to bypass the first part 31 to enter the first gap 34, and bypass the end of the second part 32 in the first gap 34 to enter the second gap 35 between the second part 32 and the bellows 33, and contact the bellows 33, which reduces the temperature of the high-temperature fluid at the inner wall of the bellows 33, thereby avoiding the sintering of the inner wall of the bellows 33 and reducing the thermal stress at the welding position of the bellows 33, and the high-temperature expansion joint has the advantages of high structural reliability and long operation cycle.

[0045] In some embodiments, the temperature reduction assembly 4 is arranged on the movable pipe section 2, and the temperature reduction assembly 4 is in communication with the second gap 35 and is adapted to introduce a cooling medium into the second gap 35 to reduce the temperature of the corrugated pipe 33.

[0046] Specifically, the temperature reduction assembly 4 is arranged on the movable pipe section 2 near one end of the movable pipe section 2 close to the fixed pipe section 1, and the temperature reduction assembly 4 includes a first assembly 401 and a second assembly 402. The first assembly 401 is arranged on the movable pipe section 2 near one end of the movable pipe section 2 close to the first pipe section 101, and the first assembly 401 is connected to the outer wall of the first connecting portion 301 to make the first assembly 401 in communication with the second gap 35 inside the first connecting portion 301. The second assembly 402 is arranged on the movable pipe section 2 near one end of the movable pipe section 2 close to the second pipe section 102, and the second assembly 402 is connected to the outer wall of the second connecting portion 302 to make the second assembly 402 in communication with the second gap 35 inside the second connecting portion 302.

[0047] Therefore, when there is high-temperature fluid in the movable pipe section 2 and the fixed pipe section 1, the cooling medium can be introduced into the second gap 35 of the connecting portion 3 through the temperature reduction assembly 4. The cooling medium can be a low-temperature fluid such as an inert gas that does not react with the high-temperature fluid. After the cooling medium enters the second gap 35, it will push the high-temperature fluid in contact with the inner wall of the corrugated pipe 33 out of the second gap 35 and / or the first gap 34, and the cooling medium will be in contact with the inner wall of the corrugated pipe 33 to reduce the temperature of the corrugated pipe 33, thereby avoiding sintering of the inner wall of the corrugated pipe 33 and reducing the thermal stress of the welding position of the corrugated pipe 33. The high-temperature expansion joint of the embodiments of the present application has the advantages of high structural reliability and long operation cycle.

[0048] In some embodiments, the temperature reduction assembly 4 includes an annular pipe 41 and a plurality of gas inlet pipes 42. The annular pipe 41 is arranged on the outer circumferential side of the movable pipe section 2 and extends closed along the outer circumferential side of the movable pipe section 2. The plurality of gas inlet pipes 42 are connected between the annular pipe 41 and the movable pipe section 2 to communicate the annular pipe 41 and the second gap 35, and the plurality of gas inlet pipes 42 are uniformly spaced along the outer circumferential side of the movable pipe section 2.

[0049] Specifically, the annular pipe 41 is arranged on the outer circumferential side of the movable pipe section 2, and the gas inlet pipe 42 is connected between the connecting portion 3 and the annular pipe 41 to communicate the second gap 35 of the connecting portion 3 and the inner cavity of the annular pipe 41. The cooling medium in the annular pipe 41 flows into the second gap 35 through the gas inlet pipe 42 to cool the corrugated pipe 33.

[0050] Therefore, the plurality of air inlet pipes 42 are evenly spaced along the circumference of the annular pipe 41, so that the cooling medium in the annular pipe 41 can be evenly distributed along the circumference of the second gap 35 after entering the second gap 35, so that the temperature of the bellows 33 is uniformly reduced, and the thermal stress of the bellows 33 is reduced, so that the high-temperature expansion joint of the embodiment has the advantages of high structural reliability and long operation cycle.

[0051] In some embodiments, the annular pipe 41 comprises an air inlet valve 43 connected to the upper end of the annular pipe 41 for the cooling medium to flow into the annular pipe 41, and a liquid outlet valve 44 arranged at the lower end of the annular pipe 41 for discharging the waste liquid in the annular pipe 41.

[0052] Specifically, the air inlet valve 43 is arranged at the upper end of the annular pipe 41, and the air inlet valve 43 is connected to the gas supply device to introduce the cooling medium into the annular pipe 41. When the pressure of the cooling medium in the annular pipe 41 is insufficient, the high-temperature fluid in the second gap 35 is easily backflowed into the annular pipe 41 through the air inlet pipe 42, cooled in the annular pipe 41 and accumulated at the lower end of the annular pipe 41.

[0053] Therefore, the liquid outlet valve 44 is arranged at the lower end of the annular pipe 41 to facilitate the discharge of the waste liquid accumulated in the annular pipe 41 to avoid the waste liquid in the annular pipe 41 entering the second gap 35 through the air inlet pipe 42 to contaminate the high-temperature fluid flowing in the movable pipe section 2 and the fixed pipe section 1.

[0054] In some embodiments, the movable pipe section 2 is provided with a heat preservation layer 21 arranged on the inner wall of the movable pipe section 2 to reduce heat loss in the movable pipe section 2. The heat preservation layer 21 has an annular protrusion 211 at the end close to the fixed pipe section 1, and at least part of the first part 31 can be fitted in the annular protrusion 211 to reduce heat loss between the first part 31 and the heat preservation layer 21.

[0055] Specifically, the heat preservation layer 21 is a cylindrical structure, and the outer wall of the heat preservation layer 21 is attached to the inner wall of the movable pipe section 2. The high-temperature fluid flowing through the movable pipe section 2 can flow through the inner side of the inner wall of the heat preservation layer 21. The heat preservation layer 21 is made of heat preservation material, and the end along the length direction of the heat preservation layer 21 has an annular protrusion 211. The annular protrusion 211 extends along the circumference of the movable pipe section 2 and protrudes towards the connecting part 3. The outer wall of the annular protrusion 211 is attached to the inner wall of the movable pipe section 2, and the thickness of the annular protrusion 211 is smaller than the width of the first gap 34, so that at least part of the annular protrusion 211 can be fitted in the first gap 34 when the movable pipe section 2 moves towards the fixed pipe section 1.

[0056] Therefore, the heat preservation layer 21 can reduce heat loss in the high-temperature fluid in the movable pipe section 2, reduce the influence of the high-temperature expansion joint on the high-temperature fluid in the high-temperature pipeline, and the at least partial annular protrusion 211 can be matched in the first gap 34 to increase the axial coverage of the heat preservation layer 21 and increase the stroke of the movable pipe section 2 moving towards the fixed pipe section 1, so that the high-temperature expansion joint can adapt to larger deformation of the high-temperature pipeline.

[0057] In some embodiments, the high-temperature expansion joint further comprises a connecting rod assembly 5, the connecting rod assembly 5 is arranged in the movable pipe section 2, one end of the connecting rod assembly 5 is connected with the first pipe section 101, the other end of the connecting rod assembly 5 is connected with the second pipe section 102, and the length of the connecting rod assembly 5 is adjustable and the distance between the first pipe section 101 and the movable pipe section 2 and the distance between the second pipe section 102 and the movable pipe section 2 are the same.

[0058] Specifically, the connecting rod assembly 5 is connected between the first pipe section 101, the movable pipe section 2 and the second pipe section 102, the connecting position of the connecting rod assembly 5 and the movable pipe section 2 is located in the middle of the movable pipe section 2, the connecting rod assembly 5 and the movable pipe section 2 have a first connecting position 51, the connecting rod assembly 5 and the first pipe section 101 have a second connecting position 52, and the connecting rod assembly 5 and the second pipe section 102 have a third connecting position 53.

[0059] The connecting rod assembly 5 comprises a first section 501 and a second section 502, the part of the connecting rod assembly 5 between the first connecting position 51 and the second connecting position 52 forms the first section 501, the part of the connecting rod assembly 5 between the third connecting position 53 and the second connecting position 52 forms the second section 502, and the lengths of the first section 501 and the second section 502 are always the same.

[0060] Therefore, the lengths of the first section 501 and the second section are kept the same, the distance between the first pipe section 101 and the movable pipe section 2 and the distance between the second pipe section 102 and the movable pipe section 2 are the same, the lengths of the first connecting part 301 and the second connecting part 302 are the same, the first connecting part 301 and the second connecting part 302 have the same deformation amount when the high-temperature pipeline expands or shrinks, and the deformation amount of one of the first connecting part 301 and the second connecting part 302 is prevented from being too large to cause structural damage, so that the high-temperature expansion joint has the advantages of high structural reliability and long operation cycle.

[0061] The high-temperature expansion joint further comprises a pull rod 6, one end of the pull rod 6 is arranged in the first pipe section 101, the other end of the pull rod 6 is arranged in the second pipe section 102, and at least part of the movable pipe section 2 is sleeved on the pull rod 6, so that the movable pipe section 2 can slide along the length direction of the pull rod 6.

[0062] Specifically, the plurality of pull rods 6 are uniformly arranged along the circumference of the movable pipe section 2, one end of the pull rod 6 is connected with the first pipe section 101, the other end of the pull rod 6 is connected with the second pipe section 102, the pull rod 6 can be stretched and contracted along the length direction to adapt to the change of the interval between the first pipe section 101 and the second pipe section 102, the movable pipe section 2 is provided with a sliding seat, the sliding seat is sleeved on the outer circumferential side of the pull rod 6, so that the movable pipe section 2 can move along the axial direction of the pull rod 6 and the radial movement of the movable pipe section 2 along the pull rod 6 is limited.

[0063] Therefore, when the high-temperature pipeline expands or contracts, the first pipe section 101 and the second pipe section 102 produce displacement along the axial direction, the plurality of pull rods 6 can bear the thermal stress in the high-temperature pipeline to reduce the expansion and contraction of the first connecting part 301 and the second connecting part 302 when the high-temperature pipeline expands or contracts, the probability of structural damage at the connecting part 3 is reduced by reducing the deformation amount of the connecting part 3, and the high-temperature expansion joint of the embodiment of the present application has the advantages of high structural reliability and long operation cycle.

[0064] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0066] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0068] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the particular feature, structure, material, or characteristic following the term is included in at least one embodiment or example of the present application. The illustrative appearances of the above terms in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Also, the terms "first", "second", "third", etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

[0069] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary, and are not to be construed as limiting the present application, and any changes, modifications, replacements, and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A high temperature expansion joint, characterized by, The application relates to a high-temperature pipeline, which comprises a fixed pipe section and a movable pipe section, the fixed pipe section comprises a first pipe section and a second pipe section, the movable pipe section is connected between the first pipe section and the second pipe section, and a set gap is arranged between the movable pipe section and the fixed pipe section to adapt to the thermal deformation of the high-temperature pipeline; a connecting part is arranged in the set gap and is sealingly connected between the fixed pipe section and the movable pipe section, and the length of the connecting part can be adjusted to adapt to the width change of the set gap; a cooling assembly is arranged in any one of the fixed pipe section and the movable pipe section, the cooling assembly is connected with the connecting part and is adapted to reduce the working temperature of the connecting part to prevent the connecting part from being structurally failed due to heat; the connecting part comprises a first part, a second part and a bellows, the first part is arranged at one end of the fixed pipe section and extends along the circumference of the fixed pipe section, the second part is arranged at one end of the movable pipe section and extends along the circumference of the movable pipe section, the first part is matched in the second part and is movable relative to the second part, and the bellows is arranged at the outer circumferential side of the first part and is connected between the fixed pipe section and the movable pipe section to close the gap between the first part and the second part; the first part is made of heat-insulating material, one end of the first part is connected with the inner wall of the fixed pipe section, the other end of the first part extends to the outer side of the fixed pipe section along the axial direction of the movable pipe section, and a first gap is arranged between the first part and one end of the fixed pipe section, and part of the second part can be matched in the first gap; one end of the second part is connected with the inner wall of the movable pipe section, the other end of the second part extends to the outer circumferential side of the first part along the axial direction of the movable pipe section and matches the first part in the second part, and a second gap is arranged between the second part and the inner wall of the movable pipe section to match the second part in the inner wall of the fixed pipe section; the cooling assembly is arranged in the movable pipe section, the cooling assembly is communicated with the second gap and is adapted to introduce cooling medium into the second gap to reduce the temperature of the bellows; the cooling assembly comprises an annular pipe and a plurality of air inlet pipes, the annular pipe is sleeved on the outer circumferential side of the movable pipe section and extends along the outer circumferential side of the movable pipe section, the plurality of air inlet pipes are connected between the annular pipe and the movable pipe section to communicate the annular pipe and the second gap, and the plurality of air inlet pipes are uniformly and spacedly arranged along the outer circumference of the movable pipe section; the annular pipe comprises an air inlet valve and a liquid outlet valve, the air inlet valve is connected with the upper end of the annular pipe to enable the cooling medium to flow into the annular pipe, and the liquid outlet valve is arranged at the lower end of the annular pipe and is adapted to discharge waste liquid in the annular pipe; a heat-insulating layer is arranged in the movable pipe section, the heat-insulating layer is arranged on the inner wall of the movable pipe section to reduce the heat loss in the movable pipe section, the heat-insulating layer is provided with an annular protrusion near the end of the fixed pipe section, and at least part of the first part can be matched in the annular protrusion to reduce the heat loss between the first part and the heat-insulating layer. ​ ​ ​ ​ ​ ​ 2. The high temperature expansion joint of claim 1, wherein, ​ 3. The high temperature expansion joint of claim 2, wherein, ​ 4. The high temperature expansion joint of claim 3, wherein, ​ 5. The high temperature expansion joint of claim 1, wherein, ​ 6. The high temperature expansion joint according to any one of claims 1-5, characterized in that, Further comprising a linkage assembly arranged on the movable pipe segment, one end of the linkage assembly being connected to the first pipe segment, and the other end of the linkage assembly being connected to the second pipe segment, the length of the linkage assembly being adjustable and making the distance between the first pipe segment and the movable pipe segment and the distance between the second pipe segment and the movable pipe segment the same.

7. The high temperature expansion joint of claim 6, wherein, Further comprising a pull rod, one end of the pull rod being arranged on the first pipe segment, and the other end of the pull rod being arranged on the second pipe segment, at least part of the movable pipe segment being sleeved on the pull rod, so that the movable pipe segment can slide along the length direction of the pull rod.

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