Heat-preservation corrosion-resistant coating layer structure for pipeline protection

Abstract

The utility model relates to the field of pipeline protection, discloses a heat-preservation corrosion-resistant coating layer structure for pipeline protection, and solves the problems that the performance of polyurethane foam is gradually degraded when the polyurethane foam is at a high temperature for a long time, the temperature of part of the pipeline fluctuates frequently, the polyurethane foam expands with heat and contracts with cold repeatedly, internal microcracks continuously expand, and finally cracks are formed. The heat-preservation corrosion-resistant coating layer structure for pipeline protection comprises primer, a pipeline body arranged on the inner side of the primer, a first heat-preservation layer arranged on the outer side of the pipeline body, a second heat-preservation layer arranged on the outer side of the first heat-preservation layer and a compression-resistant layer arranged on the outer side of the second heat-preservation layer. When the pipeline body conveys high-temperature gas and heat to the second heat preservation layer, the second heat preservation layer is prone to deformation, but due to the fact that the inner side face of the second heat preservation layer is provided with a plurality of grooves which are formed by communicating a plurality of V-shaped grooves and distributed, stress deformation can be effectively reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of pipeline protection, specifically to a thermal insulation and corrosion-resistant coating layer structure for pipeline protection. Background Technology

[0002] The thermal insulation and corrosion-resistant coating structure used for pipeline protection is a composite functional coating structure, usually composed of multiple coatings or materials with different functions, designed to provide comprehensive protection for pipelines, including thermal insulation, corrosion resistance and other related performance enhancements.

[0003] The announcement number CN211145780U discloses an external insulation layer structure for a pipeline, comprising a protective layer, a moisture-proof layer, an insulation layer, stainless steel strapping, aerogel felt, an air barrier layer, and a pipeline. The pipeline is a cylindrical structure. The aerogel felt is a silica gel roll structure, with the aerogel felts stacked sequentially and secured with stainless steel strapping. In the field of pipeline protection, thermal insulation and corrosion-resistant coatings are crucial for ensuring stable pipeline operation. Polyurethane foam is commonly used as an insulation material; however, polyurethane foam is prone to cracking at high temperatures. This is mainly due to its material properties; polyurethane foam has a relatively large coefficient of thermal expansion, which does not match the coefficients of thermal expansion of the pipeline body material and other coating materials. At high temperatures, the difference in expansion between different materials generates thermal stress, which, if exceeded, will cause cracking. High temperatures can intensify the movement of polyurethane foam molecular chains, weaken intermolecular forces, and potentially damage the cross-linked structure, leading to reduced material toughness and increased brittleness. Construction processes are also affected; excessively rapid foaming can generate significant internal stress, and uneven mixing of raw materials can cause localized stress concentration. At high temperatures, these internal stresses, combined with thermal stress, increase the risk of cracking. Furthermore, high temperature and humidity or low temperature during construction can affect the curing effect of polyurethane foam, resulting in inconsistent internal and external curing or incomplete reaction, making it prone to cracking during subsequent high-temperature use. In addition, in application environments where some pipelines transport high-temperature media for extended periods, the performance of polyurethane foam gradually deteriorates due to prolonged exposure to high temperatures. Frequent temperature fluctuations in some pipelines cause repeated thermal expansion and contraction of the polyurethane foam, leading to the continuous expansion of internal microcracks and ultimately cracking, severely impacting the pipeline's protective effect and service life. Utility Model Content

[0004] The purpose of this invention is to provide a thermal insulation and corrosion-resistant coating layer structure for pipeline protection. By using this device, the problem of repeated thermal expansion and contraction of polyurethane foam, which causes internal micro-cracks to continuously expand and eventually crack, seriously affecting the pipeline protection effect and service life is solved.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a thermal insulation and corrosion-resistant coating layer structure for pipeline protection, comprising a primer, a pipeline body disposed inside the primer, a first thermal insulation layer disposed outside the pipeline body, a second thermal insulation layer disposed outside the first thermal insulation layer, a pressure-resistant layer disposed outside the second thermal insulation layer, a corrosion-resistant layer disposed outside the pressure-resistant layer, a groove being formed on the inner wall of the second thermal insulation layer, and a sealing layer being fixedly connected to both transverse ends of the second thermal insulation layer.

[0006] Preferably, the groove is formed by multiple interconnected "V"-shaped grooves, and multiple grooves are provided on the inner side of the second insulation layer.

[0007] Preferably, the primer material is epoxy zinc-rich.

[0008] Preferably, the material of the first insulation layer is glass wool.

[0009] Preferably, the material of the second insulation layer is polyurethane foam board.

[0010] Preferably, the corrosion-resistant layer is made of glass wool and epoxy coal tar pitch.

[0011] Preferably, the sealing layer is made of butyl rubber, and the sealing layer is bonded to both sides of the primer, the pipe body, the first insulation layer, the second insulation layer, and the corrosion-resistant layer.

[0012] Preferably, the material of the pressure-resistant layer is aluminum.

[0013] This utility model proposes a thermal insulation and corrosion-resistant coating layer structure for pipeline protection. When the pipeline body transports high-temperature gas, the heat is transferred to the second insulation layer, which is prone to deformation. However, because the inner side of the second insulation layer has multiple grooves formed by multiple interconnected "V"-shaped grooves, it can effectively reduce stress deformation, reduce the risk of cracking, and extend the service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0015] Figure 2 This is a front cross-sectional view of the main body of the pipe of this utility model.

[0016] Figure 3 This is a schematic diagram of the external structure of the second insulation layer of this utility model;

[0017] Figure 4 This is a top view cross-sectional structural diagram of the second insulation layer of this utility model.

[0018] In the diagram: 1. Primer; 2. Pipe body; 3. First insulation layer; 4. Second insulation layer; 8. Pressure-resistant layer; 5. Corrosion-resistant layer; 6. Groove; 7. Sealing layer. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-4 This utility model provides a technical solution: a thermal insulation and corrosion-resistant coating layer structure for pipeline protection, comprising a primer 1, a pipeline body 2 disposed inside the primer 1, a first thermal insulation layer 3 disposed outside the pipeline body 2, a second thermal insulation layer 4 disposed outside the first thermal insulation layer 3, a pressure-resistant layer 8 disposed outside the second thermal insulation layer 4, and a corrosion-resistant layer 5 disposed outside the pressure-resistant layer 8. A groove 6 is formed on the inner wall of the second thermal insulation layer 4, and sealing layers 7 are fixedly connected to both transverse ends of the second thermal insulation layer 4. The pressure-resistant layer 8 is made of aluminum. The groove 6 is composed of multiple interconnected "V"-shaped grooves, and multiple grooves 6 are provided on the inner side of the second insulation layer 4. The primer 1 is made of epoxy zinc-rich material, the first insulation layer 3 is made of glass wool, the second insulation layer 4 is made of polyurethane foam board, the corrosion-resistant layer 5 is made of glass wool epoxy coal tar, and the sealing layer 7 is made of butyl rubber. The sealing layer 7 is in close contact with both transverse sides of the primer 1, the pipe body 2, the first insulation layer 3, the second insulation layer 4, and the corrosion-resistant layer 5 to reduce the entry of moisture, thereby affecting the insulation and corrosion resistance effect.

[0021] When high-temperature gas is transported inside the main pipe 2, heat is transferred to the interior of the second insulation layer 4. Because the material of the second insulation layer 4 is polyurethane foam board, it is prone to deformation. Since the inner surface of the second insulation layer 4 has grooves 6, when deformation occurs, pressure is transmitted to these grooves, causing the polyurethane foam board at the grooves to deform. These grooves 6 are composed of multiple interconnected "V"-shaped grooves, and multiple grooves 6 are located on the inner surface of the second insulation layer 4. The presence of multiple interconnected "V"-shaped grooves on the polyurethane foam board and multiple grooves 6 on the inner surface of the second insulation layer 4 effectively reduces stress deformation. This is due to its multiple advantages: the unique "V" shape allows stress to be dispersed in different directions along the two inclined sides, avoiding stress concentration at a single point or in a narrow area. When complex stresses arise from thermal expansion and contraction of the pipeline, it can guide stress in different directions along different paths, achieving uniform distribution; multiple "V" shapes... The interconnected grooves form a complex network, greatly expanding the stress transmission and dispersion range, ensuring uniform stress distribution on the insulation layer, and preventing excessive local deformation. Simultaneously, the "V"-shaped structure possesses excellent flexibility and deformability; the apex and sides undergo elastic deformation under stress, converting some stress into elastic potential energy. For example, when the pipeline is subjected to stress impact, the "V"-shaped grooves act like springs, absorbing stress energy and protecting the overall structure. Multiple "V"-shaped grooves can also work collaboratively; when one "V"-shaped groove is overloaded, adjacent grooves quickly assist in sharing and buffering the stress. Furthermore, the groove structure 6, with its flexible direction and shape, can precisely adapt to the complex stresses under actual pipeline conditions, such as axial, radial, and shear stresses. Each "V"-shaped groove functions according to the stress direction, comprehensively addressing various stresses, reducing stress-induced deformation, minimizing cracking of the second insulation layer 4, and extending the service life of the second insulation layer 4.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermal insulation and corrosion-resistant coating structure for pipeline protection, comprising a primer (1), a pipeline body (2) disposed inside the primer (1), a first thermal insulation layer (3) disposed outside the pipeline body (2), a second thermal insulation layer (4) disposed outside the first thermal insulation layer (3), a pressure-resistant layer (8) disposed outside the second thermal insulation layer (4), and a corrosion-resistant layer (5) disposed outside the pressure-resistant layer (8), characterized in that: The inner wall of the second insulation layer (4) is provided with a groove (6), and the two transverse ends of the second insulation layer (4) are fixedly connected with a sealing layer (7).

2. The thermal insulation and corrosion-resistant coating layer structure for pipeline protection according to claim 1, characterized in that: The groove (6) is composed of multiple interconnected "V" shaped grooves, and multiple grooves (6) are provided on the inner side of the second insulation layer (4).

3. The thermal insulation and corrosion-resistant coating layer structure for pipeline protection according to claim 1, characterized in that: The primer (1) is made of epoxy zinc-rich material.

4. The thermal insulation and corrosion-resistant coating layer structure for pipeline protection according to claim 1, characterized in that: The first insulation layer (3) is made of glass wool.

5. The thermal insulation and corrosion-resistant coating layer structure for pipeline protection according to claim 1, characterized in that: The material of the second insulation layer (4) is polyurethane foam board.

6. The thermal insulation and corrosion-resistant coating layer structure for pipeline protection according to claim 1, characterized in that: The corrosion-resistant layer (5) is made of glass wool and epoxy coal tar pitch.

7. The thermal insulation and corrosion-resistant coating layer structure for pipeline protection according to claim 1, characterized in that: The sealing layer (7) is made of butyl rubber, and the sealing layer (7) is bonded to both sides of the primer (1), the pipe body (2), the first insulation layer (3), the second insulation layer (4), and the corrosion-resistant layer (5).

8. The thermal insulation and corrosion-resistant coating layer structure for pipeline protection according to claim 1, characterized in that: The material of the pressure-resistant layer (8) is aluminum.

Images