Special PTFE hose for conveying liquid at extreme temperature

Abstract

The utility model belongs to PTFE hose technical field, and disclose a kind of special PTFE hose for extreme temperature resistant special liquid delivery, including hose main body, the outside of hose main body is equipped with detachable protective sleeve, the hose main body is by the inner lining, reinforcing layer, outer sheath sequentially arranged from inside to outside, the inner lining includes modified PTFE base layer, the inner wall of modified PTFE base layer is combined with perfluoropolyether coating, the reinforcing layer includes superfine stainless steel wire inner layer, the outer side of superfine stainless steel wire inner layer is provided with aramid fiber outer layer, the outer sheath is by the stainless steel foil layer, aerogel layer, fluorine rubber layer sequentially arranged from outside to inside, the detachable protective sleeve includes two symmetrically arranged half sleeve body, with wide temperature range, the strong ability of preventing special medium penetration, pressure fatigue resistance performance is excellent, and installation maintenance is convenient, and the advantages, such as high protection reliability.

Description

Technical Field

[0001] This utility model belongs to the field of PTFE hose technology, specifically a special PTFE hose for transporting special liquids resistant to extreme temperatures. Background Technology

[0002] In fields such as chemical engineering, aerospace, and new energy, it is often necessary to transport special liquids that are highly corrosive, cryogenic (such as liquid hydrogen and liquid nitrogen), or high-temperature (such as molten salt and hot oil). These scenarios place extremely high demands on the extreme temperature resistance, chemical stability, pressure resistance, and protective reliability of the transport hoses. Polytetrafluoroethylene (PTFE) has become a commonly used base material for special liquid transport hoses due to its excellent corrosion resistance and wide operating temperature range.

[0003] However, traditional PTFE hoses still have many shortcomings: a single PTFE liner is prone to embrittlement in cryogenic environments and creep at high temperatures, and its barrier properties against highly permeable media such as supercritical CO2 and hydrofluoric acid are insufficient, making it prone to media leakage or seepage; the reinforcing layer is mostly made of single metal wire or fiber braid, which has significant strength decay and poor fatigue resistance at extreme temperatures, making it difficult to withstand pulse pressure for a long time; the outer sheath has limited protective function and limited resistance to high-temperature radiation, low-temperature condensation and mechanical wear, and the hose lacks convenient detachable protection, making installation and maintenance inconvenient, which further affects its service life and safety under extreme working conditions.

[0004] Therefore, a special PTFE hose for transporting special liquids that can withstand extreme temperatures is proposed to address the above problems. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a special PTFE hose for transporting special liquids resistant to extreme temperatures. It has the advantages of a wide range of extreme temperature resistance, strong resistance to special media penetration, excellent pressure resistance and fatigue resistance, convenient installation and maintenance, and high protection reliability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a special PTFE hose for transporting special liquids resistant to extreme temperatures, comprising a hose body, wherein a detachable protective sleeve is fitted on the outside of the hose body; The hose body is composed of an inner lining layer, a reinforcing layer, and an outer sheath arranged sequentially from the inside to the outside. The inner liner includes a modified PTFE base layer, and the inner wall of the modified PTFE base layer is coated with a perfluoropolyether coating. The reinforcing layer includes an inner layer of ultra-fine stainless steel wire, and an outer layer of aramid fiber is provided on the outside of the inner layer of ultra-fine stainless steel wire. The outer sheath is composed of a stainless steel foil layer, an aerogel layer, and a fluororubber layer arranged sequentially from the outside to the inside. The detachable protective sleeve includes two symmetrically arranged half-sleeve bodies. The side of the half-sleeve bodies that are in contact with each other has a side lug on the outside, and the two side lugs that are in contact with each other are connected by a fixing bolt.

[0007] Preferably, the thickness of the perfluoropolyether coating is set to 5-10 μm.

[0008] Preferably, the inner wall of the liner is polished using micro-nano structured methods and has spiral flow channels.

[0009] Preferably, the inner layer of the ultrafine stainless steel wire is coated with a nickel-phosphorus alloy with a thickness of 5-8 μm.

[0010] Preferably, the thickness of the stainless steel foil layer is set to 0.1-0.3 mm, and the thickness of the aerogel layer is set to 5-8 mm.

[0011] Preferably, the inner wall of the detachable protective sleeve is provided with equidistant sealing rings along the axial direction, and a sealed cavity is formed between the sealing rings, the detachable protective sleeve, and the hose body.

[0012] Preferably, the sealing ring is composed of two semi-rings, and the semi-rings are disposed on the inner wall of the half-sleeve.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The main body of this utility model hose adopts a layered optimized design. The inner lining layer is a composite of modified PTFE base layer and perfluoropolyether coating. It retains the characteristics of PTFE in high and low temperature resistance and strong corrosion resistance, while the perfluoropolyether coating greatly improves the barrier ability against highly permeable media. At the same time, micro-nano structured polishing and spiral flow guide groove effectively optimize the transportation efficiency of high viscosity media. The reinforcing layer is composed of an inner layer of ultra-fine stainless steel wire plated with nickel-phosphorus alloy and an outer layer of aramid fiber. It avoids hydrogen embrittlement in cryogenic environments, maintains high strength in high temperature environments, and improves fatigue resistance. It can withstand pulse pressure for a long time. The outer sheath has a multi-layer structure of stainless steel foil, aerogel, and fluororubber, which can efficiently reflect high temperature radiation and block heat transfer. At the same time, it resists low temperature condensation and mechanical wear, and comprehensively ensures the structural stability and media transportation safety of the hose in extreme temperature ranges. 2. The design of this utility model's detachable protective sleeve combines convenient installation with protective functionality. The two half-sleeves are connected by side lugs and fixing bolts, facilitating quick disassembly and assembly for inspection and maintenance of the hose body. The sealing ring on the inner wall forms a sealed chamber with the hose body, which not only enhances the sealing performance between the sleeve and the hose but also serves as a buffer space for leak monitoring, providing timely warnings of the risk of inner lining damage. In addition, the protective sleeve provides extra mechanical protection for the hose body, reducing damage caused by external friction and compression, and further extending the overall service life of the hose. It is particularly suitable for scenarios with stringent requirements for maintenance efficiency and safety redundancy, such as aerospace and nuclear industries. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the main body of the hose of this utility model; Figure 4 This is a schematic diagram of the structure of the inner lining layer of this utility model; Figure 5 This is a schematic diagram of the reinforcing layer of this utility model; Figure 6 This is a schematic diagram of the structure of the outer sheath of this utility model.

[0015] In the picture: 1. Hose body; 11. Inner liner; 111. Modified PTFE base layer; 112. Perfluoropolyether coating; 12. Reinforcing layer; 121. Inner layer of ultra-fine stainless steel wire; 122. Outer layer of aramid fiber; 13. Outer sheath; 131. Stainless steel foil layer; 132. Aerogel layer; 133. Fluororubber layer; 2. Detachable protective sleeve; 21. Half-sleeve body; 22. Side lug; 23. Fixing bolt; 3. Sealing ring; 4. Sealing chamber. Detailed Implementation

[0016] 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.

[0017] like Figures 1 to 6 As shown, this utility model provides a special PTFE hose for conveying special liquids resistant to extreme temperatures, including a hose body 1 and a detachable protective sleeve 2 sleeved on the outside of the hose body 1. The detachable protective sleeve 2 facilitates quick disassembly and assembly for inspection and maintenance of the hose body 1, and also provides additional mechanical protection for the hose body 1, reducing damage caused by external friction and compression, thereby extending the overall service life of the hose. The hose body 1 is composed of an inner liner 11, a reinforcing layer 12, and an outer sheath 13 arranged sequentially from the inside to the outside. The inner liner 11 includes a modified PTFE base layer 111, which remains stable in a wide temperature range of -196℃ to 300℃ and also has strong corrosion resistance. The inner wall of the modified PTFE base layer 111 is coated with a perfluoropolyether coating 112, which has a thickness of 5-10μm, and can significantly improve the barrier ability against highly permeable media such as supercritical CO2 and hydrofluoric acid. In addition, the inner wall of the inner liner 11 is polished with a micro-nano structure and has spiral flow channels, which can effectively optimize the transport efficiency of high viscosity media. The reinforcing layer 12 includes an inner layer of ultra-fine stainless steel wire 121. The surface of the ultra-fine stainless steel wire inner layer 121 is plated with a nickel-phosphorus alloy with a thickness of 5-8μm, which can avoid hydrogen embrittlement in cryogenic environments. An outer layer of aramid fiber 122 is provided on the outside of the ultra-fine stainless steel wire inner layer 121. The outer layer of aramid fiber 122 enables the reinforcing layer 12 to maintain high strength in high-temperature environments and improves fatigue resistance, allowing it to withstand pulse pressure for a long time. The outer sheath 13 is composed of a stainless steel foil layer 131, an aerogel layer 132, and a fluororubber layer 133 arranged sequentially from the outside to the inside. The stainless steel foil layer 131 is 0.1-0.3mm thick and can effectively reflect high-temperature radiation; the aerogel layer 132 is 5-8mm thick and can effectively block heat transfer; the fluororubber layer 133 can resist low-temperature condensation and mechanical wear, ensuring the structural stability of the hose in extreme temperature ranges. The detachable protective sleeve 2 includes two symmetrically arranged half sleeve bodies 21. The side of the half sleeve bodies 21 that is in contact with each other has a side lug 22 on the outside. The two side lugs 22 that are in contact with each other are connected by a fixing bolt 23. Through the cooperation of the side lugs 22 and the fixing bolt 23, the two half sleeve bodies 21 can be quickly disassembled and assembled, improving the convenience of installation and maintenance.

[0018] Specifically, the thickness of the perfluoropolyether coating 112 is set to 5-10 μm.

[0019] Furthermore, the inner wall of the inner liner 11 is polished using micro-nano structure and has spiral flow channels.

[0020] Furthermore, the inner layer of the ultra-fine stainless steel wire 121 is coated with a nickel-phosphorus alloy with a thickness of 5-8μm.

[0021] It is worth noting that the thickness of the stainless steel foil layer 131 is set to 0.1-0.3 mm, and the thickness of the aerogel layer 132 is set to 5-8 mm.

[0022] It is worth noting that the inner wall of the detachable protective sleeve 2 is provided with equidistant sealing rings 3 along the axial direction. A sealing chamber 4 is formed between the sealing rings 3, the detachable protective sleeve 2, and the hose body 1. The sealing rings 3 not only enhance the sealing between the detachable protective sleeve 2 and the hose body 1, but also serve as a buffer space for leakage monitoring, and can provide timely warning of the risk of damage to the inner lining layer 11.

[0023] It is worth mentioning that the sealing ring 3 is composed of two semi-rings, and the semi-rings are located on the inner wall of the semi-sleeve body 21, which is compatible with the split structure of the semi-sleeve body 21, making it easy to disassemble and assemble along with the protective sleeve.

[0024] Working principle and process: When conveying special liquids, in the inner lining layer 11 of the hose body 1, the modified PTFE base layer 111 provides basic support for liquid conveying by relying on its own characteristics of withstanding extreme temperatures from -196℃ to 300℃ and strong corrosion resistance. The perfluoropolyether coating 112 on its inner wall enhances the barrier ability against highly permeable media such as supercritical CO2 and hydrofluoric acid. At the same time, the inner wall, which is polished by micro-nano structure and has spiral guide grooves, can optimize the conveying efficiency of high viscosity media. In the reinforcing layer 12, the inner layer 121 of ultra-fine stainless steel wire with nickel-phosphorus alloy coating avoids hydrogen embrittlement in cryogenic environments, and the outer aramid fiber outer layer 122 ensures strength in high-temperature environments and improves fatigue resistance. Together, they bear the conveying pressure to maintain structural stability. In the outer sheath 13, the stainless steel foil layer 131 The aerogel layer 132 effectively reflects high-temperature radiation, blocks heat transfer, and the fluororubber layer 133 resists low-temperature condensation and mechanical wear, providing comprehensive protection for the internal structure. During installation, the two half-sleeve bodies 21 of the detachable protective sleeve 2 are spliced ​​to the outside of the hose body 1 through the side ears 22 and the fixing bolts 23. The sealing ring 3, which is composed of semi-rings on the inner wall, is set along with the half-sleeve bodies and together with the detachable protective sleeve 2 and the hose body 1, forms a sealed chamber 4, which not only enhances the sealing performance but also serves as a buffer space for leak monitoring to warn of the risk of damage to the inner lining layer 11. During transportation, the special liquid is stably transported under the synergistic effect of the various layers. The detachable protective sleeve 2 also provides additional mechanical protection for the hose body 1 and facilitates maintenance and repair, ultimately achieving safe and efficient transportation of special liquids under extreme temperature environments.

[0025] 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.

[0026] 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 special PTFE hose for transporting special liquids resistant to extreme temperatures, comprising a hose body (1), characterized in that: A detachable protective sleeve (2) is fitted on the outside of the hose body (1). The hose body (1) is composed of an inner lining layer (11), a reinforcing layer (12), and an outer sheath (13) arranged sequentially from the inside to the outside; The inner liner (11) includes a modified PTFE base layer (111), and the inner wall of the modified PTFE base layer (111) is coated with a perfluoropolyether coating (112). The reinforcing layer (12) includes an inner layer (121) of ultra-fine stainless steel wire, and an outer layer (122) of aramid fiber is provided on the outside of the inner layer (121). The outer sheath (13) is composed of a stainless steel foil layer (131), an aerogel layer (132), and a fluororubber layer (133) arranged sequentially from the outside to the inside; The detachable protective sleeve (2) includes two symmetrically arranged half sleeve bodies (21). The side of the half sleeve body (21) that is in contact with each other has a side ear (22) formed on the outside. The two side ears (22) that are in contact with each other are connected by a fixing bolt (23).

2. The PTFE hose for transporting special liquids resistant to extreme temperatures according to claim 1, characterized in that: The thickness of the perfluoropolyether coating (112) is set to 5-10 μm.

3. The PTFE hose for transporting special liquids resistant to extreme temperatures according to claim 1, characterized in that: The inner wall of the liner (11) is polished with micro-nano structure and has spiral guide grooves.

4. The PTFE hose for transporting special liquids resistant to extreme temperatures according to claim 1, characterized in that: The inner layer (121) of the ultrafine stainless steel wire is coated with a nickel-phosphorus alloy with a thickness of 5-8 μm.

5. The PTFE hose for transporting special liquids resistant to extreme temperatures according to claim 1, characterized in that: The thickness of the stainless steel foil layer (131) is set to 0.1-0.3 mm, and the thickness of the aerogel layer (132) is set to 5-8 mm.

6. The PTFE hose for transporting special liquids resistant to extreme temperatures according to claim 1, characterized in that: The inner wall of the detachable protective sleeve (2) is provided with equidistant sealing rings (3) along the axial direction, and a sealing chamber (4) is formed between the sealing rings (3), the detachable protective sleeve (2), and the hose body (1).

7. The PTFE hose for transporting special liquids resistant to extreme temperatures according to claim 6, characterized in that: The sealing ring (3) is composed of two semi-rings, and the semi-rings are located on the inner wall of the semi-sleeve body (21).

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