Anti-cracking electric heat shrink sleeve

Abstract

The utility model provides a kind of anti-cracking electric heat melting sleeve, it is related to electric heat melting sleeve technical field, including inner wall pipe, the outside of the inner wall pipe is equipped with protective structure, the protective structure includes the fiber anti-cracking protective layer, temperature insulation layer and anticorrosive layer connected in order from inside to outside, adaptive pressure compensation structure is equipped between the fiber anti-cracking protective layer and temperature insulation layer, for compensating interlayer stress when pipeline is deformed due to medium pressure fluctuation or environmental temperature change, the outside of the anticorrosive layer is equipped with degradable buffer protection structure.Compared with prior art, the utility model is equipped with adaptive pressure compensation structure between the fiber anti-cracking protective layer and temperature insulation layer, so that electric heat melting sleeve has adaptive pressure compensation function, effectively make up the defect that traditional electric heat melting sleeve fixed layer structure is insufficient in anti-deformation ability, interlayer is easily stripped from stress concentration and cracks, build up initiative stress buffer and double security mechanism of over-limit safety protection.

Description

Technical Field

[0001] This utility model relates to the field of electrothermal fusion sleeve technology, and in particular to a crack-resistant electrothermal fusion sleeve. Background Technology

[0002] As a key component for pipeline connection and protection, electrothermal fusion sleeves are widely used in long-distance pipeline projects for oil, natural gas, water supply and drainage, etc. Their performance is directly related to the sealing, corrosion resistance and service life of the pipeline system. In actual working conditions, pipelines not only need to withstand the continuous pressure from the transported medium (such as high-pressure oil and natural gas), but also need to cope with the influence of complex external conditions such as underground soil compression and sudden changes in ambient temperature (such as day-night temperature difference and seasonal changes). Therefore, stringent requirements are placed on the crack resistance, deformation resistance and long-term protection capabilities of electrothermal fusion sleeves.

[0003] Application No. 202420675351.1 discloses a crack-resistant electrofusion sleeve. This electrofusion sleeve adopts a fixed laminated structure of a fiber crack-resistant protective layer, a thermal insulation layer, and an anti-corrosion layer, attempting to achieve basic crack prevention and protection functions through the combination of multiple materials, providing initial protection for pipeline connections. However, when the pipeline undergoes tensile or bending deformations due to pressure fluctuations of the transported medium (such as pulsed pressure shocks during high-pressure oil transportation) or drastic changes in ambient temperature (such as alternating extreme low and high temperatures), the lack of an effective stress buffer and dispersion structure between the layers means that it can only rely on the strength of each layer to resist deformation stress, which easily leads to the failure of interlayer bonding and causes peeling. The problems of separation and lifting can lead to local cracking, seriously affecting the anti-cracking effect. Secondly, its long-term protection and environmental adaptability are insufficient. The outer side of the anti-corrosion layer of the electrothermal fusion sleeve only reduces surface friction and wear by setting anti-slip grooves. The protective structure is simple. Under the collision, friction during pipeline transportation and mechanical squeezing during burial construction, the anti-corrosion layer is prone to damage and peeling. Moreover, after being buried underground, it cannot form a reinforced waterproof barrier. Faced with the continuous soil squeezing stress and long-term erosion by groundwater and corrosive media, the single anti-corrosion layer is difficult to achieve long-term resistance, which not only reduces the protection life, but also fails to meet the damage resistance requirements during the installation stage and the environmental friendliness after burial. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model proposes a crack-resistant electrothermal fusion sleeve.

[0005] The technical solution of this utility model is implemented as follows: a crack-resistant electrothermal fusion sleeve includes an inner wall tube, and a protective structure is provided on the outer side of the inner wall tube. The protective structure includes a fiber crack-resistant protective layer, a thermal insulation layer and an anti-corrosion layer connected sequentially from the inside to the outside. An adaptive pressure compensation structure is provided between the fiber crack-resistant protective layer and the thermal insulation layer to compensate for interlayer stress when the pipeline deforms due to fluctuations in medium pressure or changes in ambient temperature. A biodegradable buffer protective structure is provided on the outer side of the anti-corrosion layer to absorb mechanical impact during construction and form a waterproof barrier after burial to enhance protection. Multiple anti-slip grooves are provided on the outer wall of the protective structure.

[0006] Preferably, the adaptive pressure compensation structure includes a groove formed in the insulation layer near the surface wall of the fiber anti-cracking protective layer, an elastic connecting block connected to the inner surface wall of the groove, an annular airbag connected to the inner side wall of the elastic connecting block, and multiple annular airbags are provided, which are evenly arranged from top to bottom on the outer side of the fiber anti-cracking protective layer.

[0007] Preferably, the adaptive pressure compensation structure further includes an air inlet pipe connected to the outer wall of the uppermost annular airbag, the inlet end of the air inlet pipe penetrating and extending to the outside of the protective structure, and a connecting pipe connecting the two annular airbags.

[0008] Preferably, the biodegradable buffer protection structure includes a buffer sleeve disposed on the outer wall of the anti-corrosion layer, the inner wall of the buffer sleeve having a honeycomb-shaped buffer cavity, and the honeycomb-shaped buffer cavity being filled with bentonite blocks.

[0009] Preferably, one end of the inner wall tube is provided with a first connecting component, the first connecting component including a first connecting sleeve connected to one end of the inner wall tube, and a first connecting outer block connected to the end of the first connecting sleeve away from the inner wall tube.

[0010] Preferably, an annular heating wire mesh tube is connected to the inner wall of the end of the first connecting sleeve away from the first connecting tube, and the inner wall of the annular heating wire mesh tube is provided with a slot.

[0011] Preferably, one end of the inner wall tube is provided with a second connecting component, the second connecting component includes a second connecting sleeve connected to the other end of the inner wall tube, the end of the second connecting sleeve away from the inner wall tube is connected to a second connecting outer block, and the outer wall of the second connecting outer block is connected to an insert block that matches the slot.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In use, this utility model, by setting an adaptive pressure compensation structure between the fiber anti-cracking protective layer and the insulation layer, enables the electrothermal fusion sleeve to have an adaptive pressure compensation function. This effectively makes up for the defects of the traditional electrothermal fusion sleeve fixed layered structure, such as insufficient deformation resistance and easy peeling and cracking between layers due to stress concentration. It establishes a dual protection mechanism of active stress buffering and over-limit safety protection. When the pipeline deforms due to medium pressure fluctuations or drastic changes in ambient temperature in scenarios such as high-pressure oil transportation, the annular airbag can accurately compensate for the interlayer stress through real-time expansion and contraction. This avoids the problem of interlayer peeling and local cracking caused by the traditional structure relying solely on the strength of the material itself to resist stress, and significantly improves the structural stability and protective reliability of the electrothermal fusion sleeve under complex working conditions.

[0014] 2. In use, this utility model effectively overcomes the shortcomings of traditional electrothermal fusion sleeves, which rely solely on anti-slip grooves for protection, are susceptible to mechanical impact damage, and lack long-term protection after burial, by setting a biodegradable buffer protection structure on the outside of the anti-corrosion layer. During the installation and burial stages, the buffer sleeve and the internal honeycomb buffer cavity can efficiently absorb the impact force generated by mechanical collisions and compression, avoiding the risk of cracking due to accidental damage during construction, and significantly reducing construction difficulty and fusion sleeve loss rate. After being buried underground, the PLA material buffer sleeve can be naturally degraded by microorganisms, meeting the environmental protection requirements of green engineering. Moreover, the bentonite blocks in the honeycomb buffer cavity expand when exposed to water to form a dense waterproof barrier, replacing the weak protection of the traditional single-layer anti-corrosion layer, significantly enhancing the anti-corrosion and soil compression resistance in the underground environment. This structure achieves a unity of protection, environmental protection, and long-term effectiveness, solving the problem of damage resistance during the construction stage, and achieving the goal of long-term underground protection through the synergy of degradable materials and bentonite blocks, comprehensively improving the reliability and environmental adaptability of pipeline connections. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is an enlarged schematic diagram of the adaptive pressure compensation structure of this utility model;

[0019] Figure 4 This is an enlarged schematic diagram of the biodegradable buffer protection structure of this utility model.

[0020] In the diagram: 1. Inner wall tube; 2. Protective structure; 21. Fiber anti-cracking protective layer; 22. Thermal insulation layer; 23. Anti-corrosion layer; 3. First connecting assembly; 31. First connecting sleeve; 32. First connecting outer sleeve block; 33. Annular heating wire mesh tube; 34. Slot; 4. Second connecting assembly; 41. Second connecting sleeve; 42. Second connecting outer sleeve block; 43. Insert block; 5. Adaptive pressure compensation structure; 51. Groove; 52. Elastic connecting block; 53. Annular airbag; 54. Air inlet pipe; 55. Connecting pipe; 6. Biodegradable buffer protection structure; 61. Buffer sleeve; 62. Honeycomb buffer cavity; 63. Bentonite block; 7. Anti-slip groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1 and Figure 2 As shown, a crack-resistant electrothermal fusion sleeve includes an inner tube 1, with a protective structure 2 on the outer side of the inner tube 1. The protective structure 2 includes a fiber anti-cracking protective layer 21, a thermal insulation layer 22, and an anti-corrosion layer 23 connected sequentially from the inside to the outside. The fiber anti-cracking protective layer 21 is directly attached to the outer wall of the inner tube 1 to enhance the structural strength of the inner tube 1 to resist foundation deformation. The thermal insulation layer 22 covers the outside of the fiber anti-cracking protective layer 21 and can block the influence of external temperature changes on the inner tube 1 and the fiber anti-cracking protective layer 21, preventing the pipeline from cracking due to brittleness caused by temperature difference. The anti-corrosion layer 23 serves as the outermost basic protection to isolate the internal structure from the erosion of underground corrosive media. The outer wall of the protective structure 2 is uniformly provided with multiple anti-slip grooves 7 along the axial direction, which can reduce surface friction damage during handling and installation of the fusion sleeve and help improve the protective durability of the anti-corrosion layer 23.

[0023] Furthermore, one end of the inner wall tube 1 is provided with a first connecting component 3. The first connecting component 3 includes a first connecting sleeve 31 connected to one end of the inner wall tube 1. The end of the first connecting sleeve 31 away from the inner wall tube 1 is connected to a first connecting outer block 32. The inner surface of the end of the first connecting outer block 32 away from the first connecting sleeve 31 is connected to an annular heating wire mesh cylinder 33. The inner surface of the annular heating wire mesh cylinder 33 is provided with a slot 34.

[0024] One end of the inner wall tube 1 is provided with a second connecting component 4. The second connecting component 4 includes a second connecting sleeve 41 connected to the other end of the inner wall tube 1. The end of the second connecting sleeve 41 away from the inner wall tube 1 is connected to a second connecting outer sleeve block 42. The outer wall of the second connecting outer sleeve block 42 is connected to an insert block 43 that matches the slot 34.

[0025] As can be seen from the above, during use, the fiber anti-cracking protective layer 21 strengthens the protection of the inner wall pipe 1, improving its structural stability. The outer insulation layer 22 simultaneously insulates both the inner wall pipe 1 and the fiber anti-cracking protective layer 21, preventing the pipe from cracking due to brittleness caused by cold. To address the angle deviation problem that may occur during pipe connection, the upper end of the device uses a spherical connection between the first connecting sleeve 31 and the first connecting outer sleeve block 32, allowing the upper end of the pipe to be flexibly adjusted in angle, preventing stress cracking caused by forced angle adaptation, and ensuring free connection of the pipe. The lower end uses the movable connection between the second connecting sleeve 41 and the second connecting outer sleeve block 42 to achieve adaptive adjustment of the angle of the lower end of the electrothermal fusion sleeve, further avoiding the risk of cracking caused by angle changes. Finally, the anti-slip groove 7 provides auxiliary protection for the anti-corrosion structure of the pipe by reducing external wear, extending the overall protection life, and ultimately constructing a multi-dimensional anti-cracking protection system.

[0026] refer to Figure 2 and Figure 3 As shown, an adaptive pressure compensation structure 5 is provided between the fiber anti-cracking protective layer 21 and the thermal insulation layer 22, which is used to compensate for the interlayer stress when the pipeline deforms due to fluctuations in medium pressure or changes in ambient temperature.

[0027] The adaptive pressure compensation structure 5 includes a groove 51 formed in the heat insulation layer 22 near the surface wall of the fiber anti-cracking protective layer 21. An elastic connecting block 52 is connected to the inner surface wall of the groove 51. An annular airbag 53 is connected to the inner side wall of the elastic connecting block 52. Multiple annular airbags 53 are provided, and multiple annular airbags 53 are evenly arranged from top to bottom on the outer side of the fiber anti-cracking protective layer 21.

[0028] The adaptive pressure compensation structure 5 also includes an air inlet pipe 54 connected to the outer wall of the uppermost annular airbag 53. The inlet end of the air inlet pipe 54 penetrates and extends to the outside of the protective structure 2, and a connecting pipe 55 is connected between the two annular airbags 53.

[0029] Through the above technical solution:

[0030] Before use, open the air inlet pipe 54 and connect it to an external inflation device to fill the annular airbag 53 with inert gases such as nitrogen. This enables the electrothermal fusion sleeve to have an adaptive pressure compensation function, establishing a dual protection mechanism of active stress buffering and over-limit safety protection. This effectively compensates for the insufficient deformation resistance of traditional fixed laminated structures. When the pipeline deforms due to medium pressure fluctuations or drastic changes in ambient temperature in scenarios such as high-pressure oil transportation, the annular airbag 53 can compensate for interlayer stress through real-time expansion and contraction, avoiding the interlayer delamination caused by traditional structures relying solely on the material's own strength to resist stress. The system addresses issues such as separation and localized cracking. Furthermore, the pressure regulating valve provides a safety net; when stress transmission causes the pressure inside the annular airbag 53 to exceed a threshold, it automatically releases pressure to prevent excessive deformation, thus eliminating structural damage to the fusible sleeve caused by stress overload. This achieves dynamic adaptation and protection against stress in the fusible sleeve, significantly improving its resistance to deformation and safety under complex working conditions. (The automatic pressure regulating valve connects to the compensation layer of the annular airbag 53 through a pre-reserved through hole in the protective structure 2; its main body is exposed outside the anti-corrosion layer 23 or embedded in the pre-reserved installation groove of the anti-corrosion layer 23, not shown in the figure.)

[0031] Additionally, refer to Figure 2 and Figure 4 As shown, the outer side of the anti-corrosion layer 23 is provided with a biodegradable buffer protection structure 6, which is used to absorb mechanical impact during the construction stage and form a waterproof barrier after burial to enhance protection.

[0032] The biodegradable buffer protection structure 6 includes a buffer sleeve 61 disposed on the outer wall of the anti-corrosion layer 23. The inner wall of the buffer sleeve 61 is provided with a honeycomb-shaped buffer cavity 62. The honeycomb-shaped buffer cavity 62 is filled with bentonite blocks 63. The buffer sleeve 61 is a component made of polylactic acid (PLA) material.

[0033] Through the above technical solution:

[0034] In use, the buffer sleeve 61 located on the anti-corrosion layer 23 effectively compensates for the shortcomings of traditional electrothermal fusion sleeves, which rely solely on anti-slip grooves 7 for protection, are susceptible to mechanical impact damage, and lack long-term protection after burial. It constructs a full life-cycle protection system covering the construction to burial stage. During installation and burial, the buffer sleeve 61 and honeycomb buffer cavity 62 can absorb impact force, avoid construction damage risks, and reduce construction difficulty and fusion sleeve loss rate. After being buried underground, the PLA material buffer sleeve 61 naturally degrades to meet environmental protection requirements. The bentonite blocks 63 inside its cavity expand when exposed to water to form a waterproof barrier, replacing the weak protection of the single-layer anti-corrosion layer 23, enhancing underground corrosion resistance and compression resistance, achieving a unity of protection, environmental protection, and long-term effectiveness, and comprehensively improving the reliability of pipeline connections and environmental adaptability.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crack-resistant electrothermal fusion sleeve, characterized in that: The system includes an inner wall pipe (1), and a protective structure (2) is provided on the outer side of the inner wall pipe (1). The protective structure (2) includes a fiber anti-cracking protective layer (21), a heat insulation layer (22), and an anti-corrosion layer (23) connected sequentially from the inside to the outside. An adaptive pressure compensation structure (5) is provided between the fiber anti-cracking protective layer (21) and the heat insulation layer (22) to compensate for interlayer stress when the pipeline deforms due to fluctuations in medium pressure or changes in ambient temperature. A biodegradable buffer protection structure (6) is provided on the outer side of the anti-corrosion layer (23) to absorb mechanical impact during construction and form a waterproof barrier after burial to enhance protection. Multiple anti-slip grooves (7) are provided on the outer wall of the protective structure (2).

2. The anti-cracking electrofusion sleeve according to claim 1, characterized in that: The adaptive pressure compensation structure (5) includes a groove (51) formed on the surface wall of the insulation layer (22) near the fiber anti-cracking protective layer (21). An elastic connecting block (52) is connected to the inner surface wall of the groove (51). An annular airbag (53) is connected to the inner side wall of the elastic connecting block (52). Multiple annular airbags (53) are provided, and multiple annular airbags (53) are evenly arranged from top to bottom on the outer side of the fiber anti-cracking protective layer (21).

3. The anti-cracking electrofusion sleeve according to claim 2, characterized in that: The adaptive pressure compensation structure (5) also includes an air inlet pipe (54) connected to the outer wall of the uppermost annular airbag (53). The inlet end of the air inlet pipe (54) penetrates and extends to the outside of the protective structure (2). A connecting pipe (55) is connected between the two annular airbags (53).

4. The anti-cracking electrofusion sleeve according to claim 1, characterized in that: The biodegradable buffer protection structure (6) includes a buffer sleeve (61) disposed on the outer wall of the anti-corrosion layer (23), and the inner wall of the buffer sleeve (61) is provided with a honeycomb-shaped buffer cavity (62), and the honeycomb-shaped buffer cavity (62) is filled with bentonite blocks (63).

5. The anti-cracking electrofusion sleeve according to claim 1, characterized in that: One end of the inner wall tube (1) is provided with a first connecting component (3), the first connecting component (3) includes a first connecting sleeve (31) connected to one end of the inner wall tube (1), and a first connecting outer block (32) is connected to the end of the first connecting sleeve (31) away from the inner wall tube (1).

6. The anti-cracking electrofusion sleeve according to claim 5, characterized in that: The inner wall of the first connecting sleeve block (32) away from the first connecting sleeve (31) is connected to an annular heating wire mesh cylinder (33), and the inner wall of the annular heating wire mesh cylinder (33) is provided with a slot (34).

7. The anti-cracking electrofusion sleeve according to claim 6, characterized in that: One end of the inner wall tube (1) is provided with a second connecting component (4). The second connecting component (4) includes a second connecting sleeve (41) connected to the other end of the inner wall tube (1). The end of the second connecting sleeve (41) away from the inner wall tube (1) is connected to a second connecting outer block (42). The outer wall of the second connecting outer block (42) is connected to a plug (43) that matches the slot (34).

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