Sliding heat insulation structure capable of preventing fluid channeling and abrasion and expansion joint

Abstract

The invention relates to the field of high-temperature chemical devices, and provides a sliding fluid channeling prevention and abrasion prevention heat insulation structure and an expansion joint, the heat insulation structure is used for the expansion joint, the expansion joint comprises an inlet pipe assembly, a corrugated pipe and an outlet pipe assembly which are connected in sequence, a guide cylinder is connected with the inlet pipe assembly, and a baffle ring assembly is connected with the outlet pipe assembly; the heat insulation structure comprises a flow guide heat insulation layer, the flow guide heat insulation layer is arranged between the corrugated pipe and the flow guide cylinder, the flow guide heat insulation layer comprises a first heat insulation layer and a second heat insulation layer, the second heat insulation layer is arranged above the first heat insulation layer, the first heat insulation layer is connected with the flow guide cylinder, and the second heat insulation layer is connected with a baffle ring assembly; the baffle ring heat insulation layer is arranged between the outlet pipe assembly and the baffle ring assembly. According to the heat insulation structure, the working temperature of the corrugated pipe can be stably reduced for a long time, the hidden danger that the corrugated pipe fails due to accumulation of medium particles is effectively eliminated, and the heat insulation structure is simple in structure, easy to install and high in applicability.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature chemical equipment, and in particular to a sliding, anti-channeling, and anti-wear thermal insulation structure and an expansion joint. Background Art

[0002] In the field of high-temperature chemical equipment, pipelines have the characteristics of high medium temperature and high flow rate. As an important flexible compensation equipment of the pressure pipeline system, the bellows expansion joint can compensate for the thermal deformation of the pipeline, play a role in reducing vibration, reducing pipeline stress and increasing pipeline service life. In high-temperature media applications, the pipeline has a large thermal expansion and low material allowable stress. In order to extend the service life of the bellows and improve material performance, an insulation layer is usually filled inside the expansion joint to reduce the temperature of the bellows, such as Figure 1 shown.

[0003] When the device is started and the pipeline has axial displacement, such as Figure 2 As shown, the insulation layer of the guide tube is separated from the retaining ring assembly, and high-temperature and high-speed media can easily pass through the dust ring and enter the interior of the bellows. The insulation layer of the guide tube loses its insulation effect, causing local overheating of the bellows and increasing the failure risk of the bellows expansion joint.

[0004] When the pipe has both axial displacement and angular displacement, such as Figure 3 As shown, the insulation layer of the guide tube loses its insulation effect, and a gap appears between the dust ring and the retaining ring assembly due to the change in angular displacement. Under the continuous flushing of high-temperature and high-speed media, the dust ring loses its function of blocking medium particles and is at risk of falling off at any time. Medium particles enter the bellows and accumulate, which can easily lead to corrosion damage and high-temperature creep failure of the bellows during long-term operation, and the loss of flexible compensation function.

[0005] In summary, the thermal insulation structure of the prior art cannot prevent crossflow when the device is started and the pipeline produces axial displacement and / or angular displacement. On the one hand, high-temperature and high-speed media can easily enter the interior of the bellows, thereby causing the insulation layer of the guide tube to lose its thermal insulation effect, resulting in local overheating of the bellows, and then easily causing the bellows to fail due to high-temperature creep and lose its flexible compensation function; at the same time, on the other hand, the dust ring will lose its function of blocking medium particles and is accompanied by the risk of falling off at any time. Medium particles enter the bellows and accumulate, which can easily cause corrosion damage to the bellows during long-term operation and lose its flexible compensation function.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The purpose of the present invention is to propose a sliding, anti-channeling and anti-wear insulation structure and expansion joint to solve the problem that the insulation structure of the prior art cannot prevent channeling when the device is started and the pipeline produces axial displacement and / or angular displacement. On the one hand, high-temperature and high-speed media can easily enter the interior of the bellows, thereby causing the insulation layer of the guide tube to lose its insulation effect, causing local overheating of the bellows, and then easily causing high-temperature creep failure of the bellows and loss of flexible compensation function; at the same time, on the other hand, the dust ring will lose its function of blocking medium particles and is accompanied by the risk of falling off at any time. Medium particles enter the bellows and accumulate, which can easily cause corrosion damage to the bellows during long-term operation and loss of flexible compensation function.

[0008] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0009] A slip-proof, channeling-proof, and wear-resistant thermal insulation structure is used for an expansion joint. The expansion joint includes an inlet pipe assembly, a bellows, and an outlet pipe assembly connected in sequence. A guide tube and a retaining ring assembly are arranged inside the expansion joint. The guide tube is connected to the inlet pipe assembly, and the retaining ring assembly is connected to the outlet pipe assembly.

[0010] The thermal insulation structure comprises:

[0011] A flow-guiding heat-insulating layer, the flow-guiding heat-insulating layer being arranged between the bellows and the flow-guiding cylinder, the flow-guiding heat-insulating layer comprising a first heat-insulating layer and a second heat-insulating layer, the second heat-insulating layer being arranged above the first heat-insulating layer, the first heat-insulating layer being connected to the flow-guiding cylinder, and the second heat-insulating layer being connected to the retaining ring assembly;

[0012] a baffle ring heat insulation layer, the baffle ring heat insulation layer being arranged between the outlet pipe assembly and the baffle ring assembly,

[0013] A dustproof ring is arranged between the guide tube and the retaining ring assembly.

[0014] Furthermore, the thermal insulation structure further includes a dustproof tube, which is arranged between the first thermal insulation layer and the second thermal insulation layer, and the dustproof tube is fixedly connected to the retaining ring assembly.

[0015] Furthermore, the gap between the guide tube and the retaining ring assembly is d1, the diameter of the dust ring is d2, and d1 and d2 satisfy: d2≥2d1.

[0016] Furthermore, the heat insulation structure also includes a baffle assembly, and the baffle assembly is arranged between the guide tube and the baffle ring assembly.

[0017] Furthermore, the baffle assembly includes at least a first baffle, the first baffle is arranged on a side close to the outlet pipe assembly, and the dust ring is arranged on a side close to the inlet pipe assembly.

[0018] Furthermore, the baffle assembly further includes a second baffle, which is arranged on a side close to the inlet pipe assembly, and the dust ring is arranged between the first baffle and the second baffle.

[0019] Furthermore, the first baffle is connected to the baffle ring assembly, and the second baffle is connected to the guide tube.

[0020] Furthermore, the dustproof cylinder is connected to the second heat insulation layer.

[0021] Furthermore, a mounting groove is provided in the first thermal insulation layer, the mounting groove is provided on a side close to the second thermal insulation layer, and the mounting groove is provided on a side close to the outlet pipe assembly.

[0022] A second aspect of the present invention provides an expansion joint, wherein the expansion joint uses any one of the above-mentioned sliding, anti-channeling, and anti-wear insulation structures.

[0023] The present invention proposes a sliding, anti-channeling, and anti-wear thermal insulation structure and expansion joint. Compared with the prior art, the sliding, anti-channeling, and anti-wear thermal insulation structure and expansion joint of the present invention have the following beneficial effects:

[0024] 1) The sliding anti-channeling and anti-wear insulation structure and expansion joint described in the present invention have a dual anti-channeling mechanism, which can achieve zero medium intrusion: the dust ring of the insulation structure and the first baffle and the second baffle form a labyrinth sealing structure, which, in conjunction with the diversion effect of the guide tube, forms a first anti-channeling mechanism, which can increase the flow resistance of the medium and isolate the inflow of the medium to a certain extent; the first insulation layer and the second insulation layer are split-type diversion insulation layers, and the first insulation layer and the second insulation layer cooperate to form a second anti-channeling mechanism. The first insulation layer and the second insulation layer cooperate to dynamically adapt to the displacement of the pipeline through the sliding sealing interface, completely blocking the high-temperature and high-speed medium path, and preventing the bellows from over-temperature creep failure.

[0025] 2) The present invention provides a sliding, anti-channeling, and anti-wear insulation structure and expansion joint, wherein the dustproof sleeve connects the retaining ring assembly and the second insulation layer, further strengthening the structural rigidity of the sliding interface and preventing seal failure during displacement.

[0026] 3) The sliding anti-channeling and anti-wear insulation structure and expansion joint described in the present invention have a strict proportional relationship between the dust ring diameter d2 and the guide tube-retaining ring assembly gap d1, d2 ≥ 2d1, which can avoid friction and wear caused by displacement while ensuring the interception efficiency of the labyrinth seal.

[0027] 4) The present invention describes a sliding, anti-channeling, and anti-wear thermal insulation structure and expansion joint, wherein the first baffle is connected to the baffle ring assembly, and the second baffle is connected to the guide tube. This arrangement ensures the flexible compensation effect of the expansion joint, while increasing the medium flow resistance and reducing the medium flow area, effectively blocking the erosion of high-speed medium particles, isolating small particles that pass through the large dust ring, and preventing the dust ring from falling off and becoming ineffective.

[0028] 5) The sliding, anti-channeling, and anti-wear thermal insulation structure and expansion joint described in the present invention have a simple structure, are easy to install, and have strong applicability, and can be used in various types of expansion joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is one of the structural diagrams of the thermal insulation structure of the prior art;

[0030] Figure 2 This is the second structural diagram of the thermal insulation structure of the prior art;

[0031] Figure 3 This is the third structural diagram of the thermal insulation structure of the prior art;

[0032] Figure 4 This is one of the structural schematic diagrams of a sliding, anti-channeling, and anti-wear insulation structure according to an embodiment of the present invention;

[0033] Figure 5 This is a second structural schematic diagram of a sliding, anti-channeling, and anti-wear thermal insulation structure according to an embodiment of the present invention;

[0034] Figure 6 This is the third structural schematic diagram of a sliding, anti-channeling, and anti-wear insulation structure according to an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Inlet pipe assembly; 2. Guide tube; 3. Guide insulation layer; 31. First insulation layer; 311. Mounting groove; 32. Second insulation layer; 4. Bellows; 5. Retaining ring assembly; 6. Dust ring; 61. Baffle assembly; 611. First baffle; 612. Second baffle; 7. Retaining ring insulation layer; 8. Outlet pipe assembly; 9. Dust tube. DETAILED DESCRIPTION

[0037] In order to make the technical means, objectives and effects of the present invention easier to understand, embodiments of the present invention are described in detail below with reference to specific figures.

[0038] It should be noted that all terms used in the present invention to indicate direction and position, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "low", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the various components in a certain specific state (as shown in the accompanying drawings). They are only for the convenience of describing the present invention, and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0040] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] Example 1

[0043] The thermal insulation structure of the prior art, such as Figures 1-3 As shown, when the device is started and the pipeline produces axial displacement and / or angular displacement, crossflow is not prevented. On the one hand, high-temperature and high-speed medium can easily enter the interior of the bellows 4, thereby causing the insulation layer of the guide tube 2 to lose its insulation effect, causing local overheating of the bellows 4, and then easily causing the bellows 4 to fail due to high-temperature creep and lose its flexible compensation function; at the same time, on the other hand, the dust ring will lose its function of blocking medium particles and is accompanied by the risk of falling off at any time. Medium particles enter the interior of the bellows 4 and accumulate, which can easily cause the bellows 4 to be corroded and damaged during long-term operation, and lose its flexible compensation function.

[0044] In order to solve the above technical problems, Figures 4-6 As shown, the applicant proposes a slip-proof, anti-channeling, and anti-wear insulation structure for an expansion joint. The expansion joint includes an inlet pipe assembly 1, a bellows 4, and an outlet pipe assembly 8 connected in sequence. A guide tube 2 and a retaining ring assembly 5 are arranged inside the expansion joint. The guide tube 2 is connected to the inlet pipe assembly 1, and the retaining ring assembly 5 is connected to the outlet pipe assembly 8.

[0045] The thermal insulation structure comprises:

[0046] A flow-guiding heat-insulating layer 3 is provided between the bellows 4 and the flow-guiding cylinder 2. The flow-guiding heat-insulating layer 3 includes a first heat-insulating layer 31 and a second heat-insulating layer 32. The second heat-insulating layer 32 is provided above the first heat-insulating layer 31. The first heat-insulating layer 31 is fixedly connected to the flow-guiding cylinder 2. The second heat-insulating layer 32 is fixedly connected to the retaining ring assembly 5.

[0047] The baffle ring heat insulation layer 7 is arranged between the outlet pipe assembly 8 and the baffle ring assembly 5.

[0048] The dustproof ring 6 is arranged between the guide tube 2 and the retaining ring assembly 5.

[0049] The flow-guiding heat-insulating layer 3 and the baffle ring heat-insulating layer 7 work together to significantly reduce the operating temperature of the bellows 4 and avoid high-temperature creep.

[0050] In the present application, the thermal insulation structure has a dual anti-channeling mechanism, which can achieve zero intrusion of the medium: the dust ring 6 of the thermal insulation structure and the retaining ring assembly 5 form a labyrinth sealing structure, and then cooperate with the diversion function of the guide tube 2 to form a first anti-channeling mechanism, which can increase the flow resistance of the medium and isolate the medium from flowing in to a certain extent; the first thermal insulation layer 31 and the second thermal insulation layer 32 are split-type diversion insulation layers 3, and the first thermal insulation layer 31 and the second thermal insulation layer 32 cooperate to form a second anti-channeling mechanism. The first thermal insulation layer 31 and the second thermal insulation layer 32 cooperate to form a sliding sealing interface. When the pipeline undergoes axial / angular displacement, the two layers of thermal insulation layers achieve dynamic sealing through precise matching, completely blocking the path of high-temperature and high-speed media entering the interior of the bellows 4, and preventing the bellows 4 from over-temperature creep failure.

[0051] Specifically, the heat insulation structure further includes a dustproof tube 9 , which is disposed between the first heat insulation layer 31 and the second heat insulation layer 32 , and is fixedly connected to the retaining ring assembly 5 .

[0052] The dustproof tube 9 connects the retaining ring assembly 5 and the second heat insulation layer 32 to further strengthen the structural rigidity of the sliding interface and prevent the seal from failing during the displacement process.

[0053] Specifically, the gap between the guide tube 2 and the retaining ring assembly 5 is d1, the diameter of the dust ring 6 is d2, and d1 and d2 satisfy: d2 ≥ 2d1.

[0054] In this embodiment, d2=2d1.

[0055] The strict proportional relationship d2 of the dust ring 6 and the gap d1 of the guide tube 2-blocking ring assembly 5 is d2≥2d1, which can avoid friction and wear caused by displacement while ensuring the interception efficiency of the labyrinth seal.

[0056] Specifically, the heat insulation structure further includes a baffle assembly 61 , and the baffle assembly 61 is disposed between the guide tube 2 and the baffle ring assembly 5 .

[0057] Specifically, the baffle assembly 61 includes at least a first baffle 611 , which is disposed on a side close to the outlet pipe assembly 8 , and the dust ring 6 is disposed on a side close to the inlet pipe assembly 1 .

[0058] Specifically, the baffle assembly 61 further includes a second baffle 612 , which is disposed on a side close to the inlet pipe assembly 1 , and the dust ring 6 is disposed between the first baffle 611 and the second baffle 612 .

[0059] The first baffle 611 and the second baffle 612 form a sandwich structure, protecting the dust seal 6 in the middle and effectively preventing the impact and accumulation of particles. This arrangement ensures the flexible compensation function of the expansion joint, while increasing the flow resistance of the medium and reducing the medium circulation area, effectively preventing the erosion of high-speed medium particles, isolating small particles that pass through the large dust seal 6, and preventing the dust seal 6 from falling off and becoming ineffective.

[0060] Specifically, the first baffle 611 is connected to the baffle ring assembly 5 , and the second baffle 612 is connected to the guide tube 2 .

[0061] This setting ensures the flexible compensation effect of the expansion joint, while increasing the medium flow resistance, reducing the medium flow area, effectively blocking the erosion of high-speed medium particles, isolating small particles after passing through the large dust ring, and preventing the dust ring 6 from falling off and failing.

[0062] In this embodiment, if Figures 4-6 As shown, the first baffle 611 is connected to the baffle ring assembly 5 , and the second baffle 612 is connected to the guide tube 2 .

[0063] Specifically, the dustproof cylinder 9 is connected to the second heat insulation layer 32 .

[0064] This setting further strengthens the structural rigidity of the sliding interface and prevents seal failure during displacement.

[0065] Specifically, an installation groove 311 is set in the first insulation layer 31, and the installation groove 311 is set on a side close to the second insulation layer 32, and the installation groove 311 is set on a side close to the outlet pipe assembly 8; when the insulation structure is installed, the installation groove 311 cooperates with the dustproof tube 9.

[0066] The design of the installation groove 311 is as follows: 1. When the insulation structure is installed, the installation groove 311 provides an installation space for the dust tube 9; 2. When the insulation structure is displaced, the installation groove 311 can reduce the contact area with the second insulation layer 32, reduce the heat conduction efficiency, and improve the overall insulation performance.

[0067] More specifically, in this embodiment, the guide tube 2 is welded to the inlet pipe assembly 1, the baffle ring assembly 5 is welded to the outlet pipe assembly 8, the guide tube 2 is connected to the first thermal insulation layer 31, the second baffle 612, and the dust ring 6, and the baffle ring assembly 5 is respectively connected to the second thermal insulation layer 32, the first baffle 611, and the dust tube 9.

[0068] When the pipeline is started, thermal displacement occurs. Since the second insulation layer 32 and the dust shield 9 are interconnected with the retaining ring assembly 5, they prevent the high-temperature medium in the pipeline from entering the interior of the bellows 4, effectively preventing the failure of the insulation layer when the expansion joint is in the displacement state. When the expansion joint is in the displacement state, the dust shield 6 can stretch freely, fully covering the gap between the guide tube 2 and the retaining ring assembly 5, preventing medium particles from entering the interior of the bellows 4 and reducing the risk of bellows 4 failure.

[0069] When the pipeline is started, the medium flow rate increases. Since the first baffle 611 and the second baffle 612 increase the medium flow resistance and reduce the medium flow area, they can effectively isolate the medium particles after passing through the dust ring 6, block the erosion of high-speed medium particles, and further isolate the fine particles after passing through the dust ring 6. At the same time, the first baffle 611 can also prevent the dust ring 6 from falling off and becoming ineffective, thereby extending the service life of the bellows 4.

[0070] The sliding anti-channeling and anti-wear insulation structure described in the present invention has a dual anti-channeling mechanism, which can achieve zero medium intrusion: the dust ring 6 of the insulation structure forms a labyrinth sealing structure with the first baffle 611 and the second baffle 612, and then cooperates with the diversion effect of the guide tube 2 to form a first anti-channeling mechanism, which can increase the flow resistance of the medium and isolate the medium from flowing in to a certain extent; the first insulation layer 31 and the second insulation layer 32 are split-type diversion insulation layers 3, and the first insulation layer 31 and the second insulation layer 32 cooperate to form a second anti-channeling mechanism. The first insulation layer 31 and the second insulation layer 32 cooperate to form a sliding sealing interface. When the pipeline undergoes axial / angular displacement, the two insulation layers are precisely matched to achieve dynamic sealing, completely blocking the path for high-temperature and high-speed media to enter the interior of the bellows 4, and preventing the bellows 4 from over-temperature creep failure.

[0071] The sliding, anti-channeling, and anti-wear insulation structure described in the present invention has a simple structure, is easy to install, and has strong applicability. It can achieve long-term and stable reduction in the working temperature of the bellows 4, effectively eliminate the hidden danger of failure of the bellows 4 due to accumulation of medium particles, and ensure the safe and reliable operation of the expansion joint and the device.

[0072] In summary, the first thermal insulation layer 31, the second thermal insulation layer 32, the baffle ring thermal insulation layer 7, the dust ring 6, the baffle assembly 61, the first baffle 611, the second baffle 612, the dust cylinder 9, the guide cylinder 2, and the baffle ring assembly 5 cooperate to play multiple roles:

[0073] 1. It can effectively reduce the working temperature of the core component bellows 4.

[0074] Second, the working stability of the thermal insulation structure is improved, which can achieve long-term and stable reduction in the working temperature of the bellows 4, and avoid failure of the thermal insulation layer of the expansion joint under the displacement state; when the pipeline undergoes axial / angular displacement, the thermal insulation structure has the ability to compensate for axial / angular displacement, and the thermal insulation structure can also achieve dynamic sealing through precise matching, maintaining a tight fit when the pipeline is displaced, ensuring that the thermal insulation function does not fail, and completely blocking the path for high-temperature and high-speed media to enter the interior of the bellows 4.

[0075] 3. The thermal insulation structure can effectively reduce the possibility of failure of the bellows 4 due to accumulation of medium particles, improve the safety and reliability of the expansion joint, and ensure the safe operation of the device.

[0076] 4. It has simple structure, easy installation and strong applicability, and can be used in various forms of expansion joints.

[0077] Example 2

[0078] This embodiment proposes an expansion joint, which includes a sliding, anti-channeling, and anti-wear insulation structure as described in any one of Embodiment 1.

[0079] The expansion joint includes not only the sliding, anti-channeling and anti-wear insulation structure but also other related components. Since the specific structures and specific assembly relationships of the related components are all existing technologies, they will not be described in detail here.

[0080] The advantages of the expansion joint described above are the same as those of the above-mentioned sliding, anti-channeling, and anti-wear thermal insulation structure compared to the prior art, and will not be repeated here.

[0081] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A thermal insulation structure for sliding, anti-channeling and anti-wear, characterized in that: Used for an expansion joint, the expansion joint comprises an inlet pipe assembly (1), a bellows (4) and an outlet pipe assembly (8) connected in sequence, a guide tube (2) and a retaining ring assembly (5) are arranged inside the expansion joint, the guide tube (2) is connected to the inlet pipe assembly (1), and the retaining ring assembly (5) is connected to the outlet pipe assembly (8). The thermal insulation structure comprises: A flow-guiding heat-insulating layer (3), the flow-guiding heat-insulating layer (3) being arranged between the bellows (4) and the flow-guiding tube (2), the flow-guiding heat-insulating layer (3) comprising a first heat-insulating layer (31) and a second heat-insulating layer (32), the second heat-insulating layer (32) being arranged above the first heat-insulating layer (31), the first heat-insulating layer (31) being connected to the flow-guiding tube (2), and the second heat-insulating layer (32) being connected to the retaining ring assembly (5); a baffle ring heat insulation layer (7), the baffle ring heat insulation layer (7) being arranged between the outlet pipe assembly (8) and the baffle ring assembly (5), A dustproof ring (6), the dustproof ring (6) being arranged between the guide tube (2) and the retaining ring assembly (5).

2. The slip-proof, channeling-proof, and wear-resistant thermal insulation structure according to claim 1, characterized in that: The heat insulation structure further comprises a dustproof cylinder (9), the dustproof cylinder (9) being arranged between the first heat insulation layer (31) and the second heat insulation layer (32), and the dustproof cylinder (9) being fixedly connected to the retaining ring assembly (5).

3. The sliding, anti-channeling, and anti-wear insulation structure according to claim 1, characterized in that: The gap between the guide tube (2) and the retaining ring assembly (5) is d1, the diameter of the dust ring (6) is d2, and d1 and d2 satisfy: d2≥2d1.

4. The slip-proof, channeling-proof, and wear-resistant thermal insulation structure according to claim 1, characterized in that: The heat insulation structure further comprises a baffle assembly (61), wherein the baffle assembly (61) is arranged between the guide cylinder (2) and the baffle ring assembly (5).

5. The sliding, anti-channeling, and anti-wear insulation structure according to claim 4, characterized in that: The baffle assembly (61) comprises at least a first baffle (611), wherein the first baffle (611) is arranged on a side close to the outlet pipe assembly (8), and the dust ring (6) is arranged on a side close to the inlet pipe assembly (1).

6. The sliding, anti-channeling, and anti-wear insulation structure according to claim 5, characterized in that: The baffle assembly (61) further comprises a second baffle (612), the second baffle (612) being arranged on a side close to the inlet pipe assembly (1), and the dust ring (6) being arranged between the first baffle (611) and the second baffle (612).

7. The sliding, anti-channeling, and anti-wear insulation structure according to claim 6, characterized in that: The first baffle (611) is connected to the baffle ring assembly (5), and the second baffle (612) is connected to the guide tube (2).

8. The sliding, anti-channeling, and anti-wear thermal insulation structure according to claim 2, characterized in that: The dustproof cylinder (9) is connected to the second heat insulation layer (32).

9. The sliding, anti-channeling, and anti-wear insulation structure according to claim 8, characterized in that: A mounting groove (311) is provided on the first thermal insulation layer (31), and the mounting groove (311) is provided on a side close to the second thermal insulation layer (32), and the mounting groove (311) is provided on a side close to the outlet pipe assembly (8).

10. An expansion joint, characterized in that: The expansion joint uses the slip, anti-channeling, and anti-wear insulation structure described in any one of claims 1 to 9.

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