A prefabricated direct-buried heat-insulating pipe joint structure sealed by a heat-shrinkable tape

Abstract

The application discloses a prefabricated direct-buried heat preservation pipe joint structure sealed by a heat shrinkable tape, and belongs to the technical field of heat preservation pipe connection. The prefabricated direct-buried heat preservation pipe joint structure sealed by a heat shrinkable tape comprises a first direct-buried heat preservation pipe, and one end of the first direct-buried heat preservation pipe is fixedly connected with a first sealing connector. The application realizes mechanical limiting of the second sealing connector after the insertion of the first sealing connector through the clamping design of the annular limiting boss and the annular limiting groove, effectively limits the insertion depth deviation, guarantees the stability of the connection position of the two even if subjected to external forces such as long-term soil settlement, pipeline thermal expansion and cold contraction, avoids the damage of the sealing effect of the first heat shrinkable sealing tape due to relative displacement, improves the long-term operation safety of the joint structure, and the setting of the anti-skid lines and the protective lines enhances the anti-skid performance of the limiting structure, further improves the connection stability, and ensures that reliable limiting effect can be maintained under extreme working conditions.

Description

Technical Field

[0001] This application relates to the field of thermal insulation pipe connection technology, and more specifically, to a prefabricated direct-buried thermal insulation pipe joint structure with heat shrinkable tape sealing. Background Technology

[0002] Precast direct-buried insulated pipes are widely used in pipeline projects such as centralized heating, cooling, oil and gas transportation due to their excellent thermal insulation performance, corrosion resistance and ease of construction. The joint structure is the weakest link in the precast direct-buried insulated pipe system, and its sealing and insulation performance directly affects the operational reliability and service life of the entire pipeline system.

[0003] For example, the existing patent document CN217815466U discloses a prefabricated direct-buried insulated pipe joint structure with heat shrinkable tape sealing. By using the combination of the first sealing connector, the second sealing connector and the first heat shrinkable sealing tape, the sealing insulated pipe joint structure facilitates the connection between the first direct-buried insulated pipe and the second direct-buried insulated pipe when making the joint. At the same time, it can effectively ensure the sealing performance of the first direct-buried insulated pipe and the second direct-buried insulated pipe after connection, and effectively improve the connection efficiency of the sealing insulated pipe joint structure.

[0004] However, when the second sealing connector is connected to the first sealing connector, the second sealing connector is directly inserted into the first sealing connector. The connection part lacks restraint. During long-term use, the insertion depth may shift due to external forces such as soil settlement and thermal expansion and contraction of pipelines, which may damage the sealing effect of the first heat shrink sealing strip and cause leakage risk. Utility Model Content

[0005] The purpose of this application is to provide a heat-shrinkable tape-sealed prefabricated direct-buried insulated pipe joint structure, which can effectively solve the problem that the lack of limiting at the connection part in the prior art may lead to displacement and sealing failure during long-term use. It achieves the effect of fixed insertion depth and mechanical limiting of the connection part to avoid sealing failure.

[0006] This application provides a heat-shrinkable tape-sealed prefabricated direct-buried insulated pipe joint structure, including: The first direct-buried insulation pipe has a first sealing connector fixedly connected to one end, and a second sealing connector is sleeved on the outside of the first sealing connector. A second direct-buried insulation pipe is fixedly connected to one end of the second sealing connector. A limiting structure is provided between the first sealing connector and the second sealing connector to limit the position of the first sealing connector and the second sealing connector after installation; A sealing component is disposed outside the first sealing connector and the second sealing connector, and is used to seal the connection.

[0007] The present application further specifies that the limiting structure includes an annular limiting boss fixed on the inner wall of the first sealing connector, and an annular limiting groove adapted to the annular limiting boss is provided on the inner wall of the second sealing connector.

[0008] This application is further configured such that the annular limiting protrusion is provided with anti-slip texture, the annular limiting groove is provided with anti-slip texture, the inner side wall of the first sealing connector is provided with a guide groove, and the side surface of the second sealing connector is fixedly connected with a guide rod adapted to the guide groove.

[0009] The present application further specifies that the sealing assembly includes a first heat-shrinkable sealing strip sleeved on the outside of the first sealing connector, a sealing sleeve sleeved on the second direct-buried insulation pipe, a sealing ring sleeved on the outside of the first direct-buried insulation pipe, a fixed end cap sleeved on the outside of the first direct-buried insulation pipe, and a sealing filler filling the space between the sealing sleeve and the first heat-shrinkable sealing strip.

[0010] The present application further provides that a first connecting block is fixedly connected to the side surface of the sealing sleeve, a second connecting block is fixedly connected to the side surface of the fixed end cap, and a bolt is movably connected to the side surface of the first connecting block, the bolt passing through the second connecting block.

[0011] The present application further provides that the side surface of the bolt is threaded with a nut, the end of the bolt is fitted with a rubber sleeve, and the sealing assembly further includes a second heat-shrinkable sealing strip fitted on the outside of the sealing sleeve.

[0012] The application further specifies that the end of the second sealing connector is provided with a guide slope, and the length of the second heat shrink sealing strip is twice that of the sealing sleeve, with both ends extending to the outside of the first direct-buried insulation pipe and the second direct-buried insulation pipe.

[0013] The beneficial effects of this application are as follows: The interlocking design of the annular limiting boss and the annular limiting groove achieves mechanical limiting after the second sealing connector is inserted into the first sealing connector, effectively limiting the displacement of the insertion depth. Even under long-term external forces such as soil settlement and pipeline thermal expansion and contraction, the stability of the connection position can be guaranteed, avoiding damage to the sealing effect of the first heat shrink sealing strip due to relative displacement, and improving the long-term operational safety of the joint structure. The anti-slip texture and protective texture enhance the anti-slip performance of the limiting structure, further improving the connection stability and ensuring that a reliable limiting effect can still be maintained under extreme working conditions. Attached Figure Description

[0014] Figure 1 This is a plan view of a heat-shrinkable tape-sealed prefabricated direct-buried insulated pipe joint structure according to this application; Figure 2 yes Figure 1 Sectional view at point AA; Figure 3 This is a partial three-dimensional view of a heat-shrinkable tape-sealed prefabricated direct-buried insulated pipe joint structure according to this application; Figure 4 This is a partial exploded view of a heat-shrinkable tape-sealed prefabricated direct-buried insulated pipe joint structure according to this application. Figure 5 This is a bolt structure diagram of a heat-shrinkable tape-sealed prefabricated direct-buried insulated pipe joint structure according to this application.

[0015] Explanation of the numbers in the diagram: 1. First buried insulation pipe; 2. Second buried insulation pipe; 3. First sealing connector; 31. Annular limiting boss; 311. Anti-slip texture; 32. Guide groove; 4. Second sealing connector; 41. Annular limiting groove; 421. Anti-slip texture; 42. Guide rod; 5. First heat shrink sealing strip; 6. Sealing sleeve; 61. First connecting block; 7. Sealing ring; 8. Fixed end cap; 81. Second connecting block; 9. Bolt; 91. Nut; 92. Rubber sleeve; 10. Second heat shrink sealing strip; 11. Sealing filler. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0017] like Figures 1-5 As shown in the figure, a heat shrinkable tape sealed prefabricated direct-buried insulated pipe joint structure of this embodiment includes a first direct-buried insulated pipe 1, one end of the first direct-buried insulated pipe 1 is fixedly connected to a first sealing connector 3, a second sealing connector 4 is sleeved on the outside of the first sealing connector 3, and one end of the second sealing connector 4 is fixedly connected to a second direct-buried insulated pipe 2.

[0018] It also includes a limiting structure, which is set between the first sealing connector 3 and the second sealing connector 4 to limit the position of the first sealing connector 3 and the second sealing connector 4 after installation. The limiting structure includes an annular limiting boss 31 fixed on the inner wall of the first sealing connector 3, an annular limiting groove 41 adapted to the annular limiting boss 31 on the inner wall of the second sealing connector 4, anti-slip texture 311 on the annular limiting boss 31, anti-slip texture 421 in the annular limiting groove 41, a guide groove 32 on the inner side wall of the first sealing connector 3, and a guide rod 42 adapted to the guide groove 32 fixedly connected to the side surface of the second sealing connector 4.

[0019] The matching design of the annular limiting boss 31 and the annular limiting groove 41 forms a precise mechanical limit, which can strictly restrict the axial displacement of the first sealing connector 3 and the second sealing connector 4. Even in a complex underground environment for a long time, it will not shift its position under external force, avoiding damage to the sealing structure due to connection misalignment, and reducing the risk of leakage at the source. The limiting structure adopts an annular design and is arranged coaxially with the connector, so the force is evenly distributed and will not cause local stress concentration at the connector, protecting the structural integrity and extending the service life of the joint. The anti-slip texture 311 and the anti-slip texture 421 in the annular limiting groove 41 mesh with each other, increasing the friction of the limiting structure and further improving the limiting stability. This effectively prevents relative sliding between the connectors under extreme working conditions, ensuring long-term reliable limiting effect. The matching design of the guide groove 32 and the guide rod 42 provides precise guidance for the assembly of the first sealing connector 3 and the second sealing connector 4, ensuring that the annular limiting boss 31 can quickly and accurately engage with the annular limiting groove 41, avoiding misalignment and jamming during assembly, and improving assembly efficiency and accuracy.

[0020] It also includes a sealing component, which is set outside the first sealing connector 3 and the second sealing connector 4 to seal the connection and prevent leakage. The sealing component includes a first heat-shrinkable sealing strip 5 sleeved on the outside of the first sealing connector 3, a sealing sleeve 6 sleeved on the second direct-buried insulation pipe 2, a sealing ring 7 sleeved on the outside of the first direct-buried insulation pipe 1, and a fixed end cap 8 sleeved on the outside of the first direct-buried insulation pipe 1. A sealing filler 11 is filled between the sealing sleeve 6 and the first heat-shrinkable sealing strip 5. The sealing filler 11 is a flexible heat-insulating sealing material that combines sealing and heat preservation functions, prevents the connection part from becoming a weak point in the insulation, and prevents heat loss from the pipeline or intrusion of external cold water. It is especially suitable for high-temperature transportation scenarios.

[0021] The first heat-shrinkable sealing tape is directly sleeved on the outside of the first sealing connector 3, forming the first sealing barrier at the core mating part of the connector. After heat shrinking, it fits tightly and can effectively block the leakage of the medium from the gap of the connector, providing a strong sealing effect. The sealing filler 11 between the sealing sleeve 6 and the first heat-shrinkable sealing tape can fully fill the tiny gap between them, forming a second sealing line of defense. It can also adapt to the slight deformation of the connector, avoiding the creation of new leakage channels due to deformation, and further enhancing the sealing effect. The setting of the sealing ring 7 and the fixed end cap 8 forms an axial sealing constraint on one end of the sealing sleeve 6, preventing the sealing filler 11 from overflowing. At the same time, it enhances the connection sealing between the sealing sleeve 6 and the first buried insulation pipe 1, forming a multi-seal synergy, which greatly improves the overall sealing reliability and meets the sealing requirements for high-temperature liquid transportation.

[0022] A first connecting block 61 is fixedly connected to the side surface of the sealing sleeve 6, and a second connecting block 81 is fixedly connected to the side surface of the fixed end cap 8. A bolt 9 is movably connected to the side surface of the first connecting block 61, and the bolt 9 passes through the second connecting block 81. A nut 91 is threadedly connected to the side surface of the bolt 9, and a rubber sleeve 92 is fitted onto the end of the bolt 9. The sealing assembly also includes a second heat-shrinkable sealing strip 10 fitted onto the outside of the sealing sleeve 6. A guide slope is provided at the end of the second sealing connector 4. The length of the second heat-shrinkable sealing strip 10 is twice that of the sealing sleeve 6, and both ends extend to the outside of the first direct-buried insulation pipe 1 and the second direct-buried insulation pipe 2.

[0023] The sealing sleeve 6 and the fixed end cap are detachably and fixedly connected by the first connecting block 61, the second connecting block 81 and the bolt 9, thereby firmly locking the sealing sleeve 6 in the preset position, preventing the sealing sleeve 6 from shifting due to external force, ensuring the structural stability of the sealing assembly and ensuring that the sealing effect does not fail. The edges of the first connecting block 61 and the second connecting block 81 are rounded, and the sealing sleeve wraps around the end of the bolt 9 to make its end rounded and avoid scratching the second heat shrink sealing strip 10.

[0024] The guide bevel at the end of the second sealing connector 4 reduces the frictional resistance when assembling the first sealing connector 3 and the second sealing connector 4, allowing them to nest and connect more smoothly. This avoids damage to the connector due to excessive resistance during assembly. The second heat-shrinkable sealing tape 10 is twice the length of the sealing sleeve 6, extending to the outside of the first and second direct-buried insulation pipes 2 at both ends, forming an overall covering and sealing of the sealing sleeve 6 and the connector docking area. The sealing coverage is wider, effectively preventing external moisture, soil impurities, etc. from entering the seal, protecting the internal sealing components and further enhancing the leak-proof effect.

[0025] The working principle of this application is as follows: When it is necessary to connect the first direct-buried insulation pipe 1 and the second direct-buried insulation pipe 2, the sealing sleeve 6 is fitted onto the second direct-buried insulation pipe 2, the sealing ring 7 and the fixed end cap 8 are fitted onto the first direct-buried insulation pipe 1, the first heat-shrinkable sealing tape 5 is fitted onto the first sealing connector 3, the second sealing connector 4 is aligned with the pipe opening of the first sealing connector 3 and inserted, the guide rod 42 is inserted into the guide groove 32 until the annular limiting boss 31 engages in the annular limiting groove 41, at which point the insertion depth reaches the preset value, completing the initial limiting and fixing. The first heat-shrinkable sealing tape 5 is then shrunk and fixed by heating. The first seal is achieved. Then, the sliding sealing sleeve 6 is fitted over the outside of the first sealing connector 3 and the second sealing connector 4. The sealing filler 11 is filled inside the sealing sleeve 6. The sliding sealing ring 7 and the fixed end cap 8 are connected so that one end of the sealing ring 7 contacts the sealing sleeve 6. The sealing sleeve 6 and the fixed end cap 8 are fixedly connected by bolts 9 and nuts 91. A rubber sleeve 92 is fitted over the end of the bolt 9. Finally, a second heat shrink sealing tape 8 is fitted over the outside of the sealing sleeve 6, the sealing ring 7 and the fixed end cap 8. The tape is heated so that its two ends shrink and are fixed on the first direct-buried insulation pipe 1 and the second direct-buried insulation pipe 2, thus completing the overall seal.

[0026] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A prefabricated direct-buried insulated pipe joint structure with heat-shrinkable tape sealing, characterized in that, It includes a first direct-buried insulation pipe (1), one end of the first direct-buried insulation pipe (1) is fixedly connected to a first sealing connector (3), a second sealing connector (4) is sleeved on the outside of the first sealing connector (3), and one end of the second sealing connector (4) is fixedly connected to a second direct-buried insulation pipe (2). A limiting structure is provided between the first sealing connector (3) and the second sealing connector (4) to limit the position of the first sealing connector (3) and the second sealing connector (4) after installation; A sealing component is disposed outside the first sealing connector (3) and the second sealing connector (4) for sealing the connection.

2. The prefabricated direct-buried insulated pipe joint structure with heat shrinkable tape sealing according to claim 1, characterized in that: The limiting structure includes an annular limiting boss (31) fixed on the inner wall of the first sealing connector (3), and an annular limiting groove (41) adapted to the annular limiting boss (31) is provided on the inner wall of the second sealing connector (4).

3. The prefabricated direct-buried insulated pipe joint structure with heat shrinkable tape sealing according to claim 2, characterized in that: The annular limiting boss (31) is provided with anti-slip texture (311), the annular limiting groove (41) is provided with anti-slip texture (421), the inner side wall of the first sealing connector (3) is provided with guide groove (32), and the side surface of the second sealing connector (4) is fixedly connected with guide rod (42) adapted to guide groove (32).

4. The prefabricated direct-buried insulated pipe joint structure with heat shrinkable tape sealing according to claim 1, characterized in that: The sealing assembly includes a first heat shrinkable sealing strip (5) sleeved on the outside of the first sealing connector (3), a sealing sleeve (6) sleeved on the second direct-buried insulation pipe (2), a sealing ring (7) sleeved on the outside of the first direct-buried insulation pipe (1), a fixed end cap (8) sleeved on the outside of the first direct-buried insulation pipe (1), and a sealing filler (11) between the sealing sleeve (6) and the first heat shrinkable sealing strip (5).

5. The prefabricated direct-buried insulated pipe joint structure with heat shrinkable tape sealing according to claim 4, characterized in that: The sealing sleeve (6) is fixedly connected to a first connecting block (61) on its side surface, and the fixed end cap (8) is fixedly connected to a second connecting block (81) on its side surface. The first connecting block (61) is movably connected to a bolt (9) on its side surface, and the bolt (9) passes through the second connecting block (81).

6. The prefabricated direct-buried insulated pipe joint structure with heat shrinkable tape sealing according to claim 5, characterized in that: The bolt (9) has a nut (91) threaded on its side surface, and a rubber sleeve (92) is fitted on the end of the bolt (9). The sealing assembly also includes a second heat-shrinkable sealing strip (10) fitted on the outside of the sealing sleeve (6).

7. The prefabricated direct-buried insulated pipe joint structure with heat shrinkable tape sealing according to claim 6, characterized in that: The end of the second sealing connector (4) is provided with a guide slope, and the length of the second heat shrink sealing strip (10) is twice that of the sealing sleeve (6), with both ends extending to the outside of the first direct buried insulation pipe (1) and the second direct buried insulation pipe (2).

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