A low-leakage low-temperature medium flexible transfer pipeline structure

Abstract

The invention discloses a low-heat-leakage low-temperature medium flexible transfer pipeline structure, wherein a double-layer low-temperature transfer flexible hose assembly is on the inner side, and a double-layer sheath armor assembly wraps the double-layer low-temperature transfer flexible hose on the outer side; the double-layer low-temperature transfer flexible hose assembly includes an inner layer bellows, an inner tube spiral air suction belt, a variable-density insulation layer, an outer tube spiral Hertz contact support, and an outer layer bellows; the double-layer sheath armor assembly includes an inner sheath, an inner tension armor wire, an intermediate sheath, an outer tension armor wire, and an outer sheath. It can ensure that the low-temperature transfer pipeline has the characteristics of high vacuum, low heat leakage, and anti-instability during the transfer process of liquid hydrogen, ensure high vacuum, less heat loss, and higher stability between components, and ensure that the flexible hose still has a good stress state and safe protection effect on the double-layer bellows under various loads such as tension, compression, bending, torsion, and repeated large temperature difference thermal shock; the inner, middle, and outer three-layer non-metallic sheaths separate the metal parts to avoid metal friction and wear, and can also effectively avoid unsafe factors such as electric sparks caused by direct contact and collision of metals.

Description

Technical Field

[0001] The invention relates to a cryogenic medium transfer pipeline, in particular to a low-heat leakage cryogenic medium flexible transfer pipeline structure with double-layer sheath armor in a liquid hydrogen temperature zone. Background Art

[0002] Liquid hydrogen has a boiling point of only about 20K at atmospheric pressure. It has the characteristics of low boiling point and small latent heat of vaporization. In the transportation pipeline, there may be gaseous hydrogen, gas-liquid two-phase hydrogen, saturated hydrogen and supercooled hydrogen. This increases the complexity of the flow of liquid hydrogen in the transportation pipeline and also places very high requirements on the leakage and thermal insulation characteristics of the transportation pipeline. However, the existing transfer pipelines still have some shortcomings in terms of high vacuum, low heat leakage, and high stability. Specifically:

[0003] (1) Most existing transfer pipes use multiple annular supports. This support method will lead to more heat conduction. In addition, no adsorption material is provided between the pipes, which will cause the residual gas in the interlayer to cause convection heat transfer and heat conduction. If leakage occurs at the same time, the transfer process cannot be guaranteed to proceed normally.

[0004] (2) The metal fasteners used in existing pipelines are prone to collision and friction, causing unsafe factors such as electric sparks.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a low-heat-leakage, low-temperature medium flexible transfer pipeline structure to solve the above-mentioned technical problems existing in the prior art.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] The low-leakage low-temperature medium flexible transfer pipeline structure of the present invention comprises a double-layer liquid hydrogen transfer flexible hose assembly and a double-layer sheath armor assembly, wherein the double-layer liquid hydrogen transfer flexible hose assembly is inside, and the double-layer sheath armor assembly wraps the double-layer liquid hydrogen transfer flexible hose outside;

[0009] The double-layer liquid hydrogen transfer flexible hose structure specifically includes an inner layer corrugated pipe, an inner pipe spiral air intake belt, a variable density insulation layer, an outer pipe spiral Hertz contact support, and an outer layer corrugated pipe, which are stacked from the inside to the outside in sequence, wherein:

[0010] The inner tube spiral air suction belt is wound on the inner layer corrugated pipe in a spiral form, and the variable density insulation layer covers the inner tube spiral air suction belt and is fastened by the outer tube spiral Hertz contact support; the outer layer corrugated pipe is connected to the outer tube spiral Hertz contact support, one part is fixed support and the other part is movable support, and the inner spiral air suction belt and the outer spiral Hertz contact support are wound in reverse symmetry with each other;

[0011] The double-layer sheath armor assembly specifically includes an inner sheath, an inner tension armor wire, an intermediate sheath, an outer tension armor wire, and an outer sheath stacked in sequence from the inside to the outside, and the inner sheath is transitionally matched with the outer corrugated tube, wherein:

[0012] The inner tension armor wire is pressed tightly on the inner sheath, the middle sheath covers the inner tension armor wire, the outer tension armor wire is wound around the middle sheath, the inner tension armor wire and the outer tension armor wire are wound in opposite directions, and the outer sheath is pressed tightly on the outer tension armor wire as the outermost layer.

[0013] Compared with the prior art, the low-heat-leakage low-temperature medium flexible transfer pipeline structure provided by the present invention has a simple structure and strong practicality. It can ensure high vacuum, less heat loss and higher stability between components during the transfer process of low-temperature media such as liquid hydrogen, and ensure that the flexible hose still has a good protective effect on the double-layer bellows under various loads such as tension, compression, bending, torsion, and repeated large temperature difference thermal shock. The three layers of non-metallic sheaths inside, middle and outside separate the metal parts to avoid metal friction and wear, and can also effectively avoid unsafe factors such as electric sparks caused by direct contact and collision of metals. This structure solves the problem of multiple dangerous and unreliable factors in existing research, and is of great significance to improving the safety of transfer of low-temperature media such as liquid hydrogen in actual environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the overall structure of a middle section of a low-heat-leakage, low-temperature medium flexible transfer pipeline structure provided by an embodiment of the present invention;

[0015] Figure 2 It is an exploded schematic diagram of a double-layer liquid hydrogen transfer flexible hose according to an embodiment of the present invention;

[0016] Figure 3 It is a schematic diagram of the decomposition of the double-layer sheath armor according to an embodiment of the present invention.

[0017] In the figure:

[0018] 1. Double-layer liquid hydrogen transfer flexible hose assembly, 2. Double-layer sheath armor assembly; 1-1. Inner layer bellows, 1-2. Inner tube spiral suction belt, 1-3. Variable density insulation layer, 1-4. Outer tube spiral Hertz contact support, 1-5. Outer layer bellows; 2-1. Inner sheath, 2-2. Inner tension armor wire, 2-3. Intermediate sheath, 2-4. Outer tension armor wire, 2-5. Outer sheath. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0020] First, the terms that may be used in this article are explained as follows:

[0021] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0022] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0023] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0024] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0025] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0026] The contents not described in detail in the examples of the present invention belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present invention, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used in the examples of the present invention, they are all conventional products that can be purchased commercially.

[0027] The low-leakage low-temperature medium flexible transfer pipeline structure of the present invention comprises a double-layer liquid hydrogen transfer flexible hose assembly and a double-layer sheath armor assembly, wherein the double-layer liquid hydrogen transfer flexible hose assembly is inside, and the double-layer sheath armor assembly wraps the double-layer liquid hydrogen transfer flexible hose outside;

[0028] The double-layer liquid hydrogen transfer flexible hose structure specifically includes an inner layer corrugated pipe, an inner pipe spiral air intake belt, a variable density insulation layer, an outer pipe spiral Hertz contact support, and an outer layer corrugated pipe, which are stacked from the inside to the outside in sequence, wherein:

[0029] The inner tube spiral air suction belt is wound on the inner layer corrugated pipe in a spiral form, and the variable density insulation layer covers the inner tube spiral air suction belt and is fastened by the outer tube spiral Hertz contact support; the outer layer corrugated pipe is connected to the outer tube spiral Hertz contact support, one part is fixed support and the other part is movable support, and the inner spiral air suction belt and the outer spiral Hertz contact support are wound in reverse symmetry with each other;

[0030] The double-layer sheath armor assembly specifically includes an inner sheath, an inner tension armor wire, an intermediate sheath, an outer tension armor wire, and an outer sheath stacked in sequence from the inside to the outside, and the inner sheath is transitionally matched with the outer corrugated tube, wherein:

[0031] The inner tension armor wire is pressed tightly on the inner sheath, the middle sheath covers the inner tension armor wire, the outer tension armor wire is wound around the middle sheath, the inner tension armor wire and the outer tension armor wire are wound in opposite directions, and the outer sheath is pressed tightly on the outer tension armor wire as the outermost layer.

[0032] The inner tube spiral suction belt can capture and release various gases in the transfer process and provide spiral support, which can meet the requirements of efficient adsorption and degassing;

[0033] The variable density heat insulation layer and the outer tube spiral Hertz contact support can improve the vacuum degree between the double-layer tubes and reduce heat convection, while the Hertz contact can also reduce heat conduction.

[0034] The inner tension armor wire and the outer tension armor wire are wound in opposite directions, so that the flexible hose can still have a good protective effect on the double-layer corrugated pipe under the load of tension, compression, bending and twisting and repeated large temperature difference thermal shock, and has the advantages of tension and compression resistance, anti-bending and twisting, and anti-instability;

[0035] The inner sheath, the middle sheath and the outer sheath are non-metallic sheaths, which separate the metal parts, thereby avoiding metal friction and wear, and effectively avoiding the unsafe factor of electric sparks caused by direct contact and collision of metals.

[0036] In summary, the radial cross-sectional features of the low-heat leakage, low-temperature medium flexible transfer pipe structure of the embodiment of the present invention are as follows: a double-layer low-temperature transfer flexible hose assembly is on the inner side, and a double-layer sheath armor assembly wraps the double-layer low-temperature transfer flexible hose on the outer side; the double-layer low-temperature transfer flexible hose assembly includes an inner layer corrugated pipe, an inner tube spiral air suction belt, a variable density insulation layer, an outer tube spiral Hertz contact support, and an outer layer corrugated pipe; the double-layer sheath armor assembly includes an inner sheath, an inner tension armor wire, an intermediate sheath, an outer tension armor wire, and an outer sheath.

[0037] The present invention has a simple structure and strong practicality. It can ensure that the low-temperature transfer pipeline has the characteristics of high vacuum, low heat leakage and anti-instability during the transfer of liquid hydrogen, ensure high vacuum, less heat loss and higher stability between components, and ensure that the flexible hose still has a good stress state and safe protection effect on the double-layer bellows under various loads such as tension, compression, bending, torsion and repeated large temperature difference thermal shock; the inner, middle and outer three-layer non-metallic sheath separates the metal parts to avoid metal friction and wear, and can also effectively avoid unsafe factors such as electric sparks caused by direct contact and collision of metals.

[0038] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0039] Example 1

[0040] like Figure 1 As shown, it is a schematic diagram of the overall structure of the middle section of a new type of high vacuum low leakage flexible transfer pipe with double-layer sheath armor in the liquid hydrogen temperature zone provided by an embodiment of the present invention. The pipe length can be unlimited according to the actual project, and the joints at both ends of the pipe can be connected in the form of vacuum quick opening and vacuum flange connection. The radial cross-section layout of the structure includes a double-layer liquid hydrogen transfer flexible hose assembly 1 and a double-layer sheath armor assembly 2, wherein:

[0041] The double-layer liquid hydrogen transfer flexible hose assembly 1 is on the inner side, and the double-layer sheath armor assembly 2 is on the outer side, wrapping the outermost side of the double-layer liquid hydrogen transfer flexible hose assembly 1;

[0042] like Figure 2 As shown, it is an exploded schematic diagram of the double-layer liquid hydrogen transfer flexible hose according to an embodiment of the present invention. The double-layer liquid hydrogen transfer flexible hose assembly 1 specifically includes an inner layer bellows 1-1, an inner tube spiral suction belt 1-2, a variable layer density insulation layer 1-3, an outer tube spiral Hertz contact support 1-4, and an outer layer bellows 1-5, wherein:

[0043] The inner tube spiral suction belt is wound on the inner tube in a spiral form, the variable density insulation layer covers the inner tube spiral suction belt, and is fastened by the outer tube spiral Hertz contact support, the outer layer corrugated tube is connected to the outer tube spiral Hertz contact support, part of the support is fixed, and part of the support is movable.

[0044] like Figure 3 As shown, it is a schematic diagram of the decomposition of the double-layer sheath armor assembly described in an embodiment of the present invention. The double-layer sheath armor assembly specifically includes an inner sheath 2-1, an inner tension armor wire 2-2, an intermediate sheath 2-3, an outer tension armor wire 2-4, and an outer sheath 2-5.

[0045] The inner sheath and the outer corrugated tube are transitionally matched, the inner tension armor wire is tightly pressed on the inner sheath, and the middle sheath covers the inner tension armor wire to separate the inner and outer tension armor wires. The inner and outer tension armor wires are wound in opposite directions to each other. The outer sheath is the outermost layer and is tightly pressed on the outer tension armor wire. Transitionally matched layers are used to prevent movement and friction.

[0046] Specifically, the inner and outer bellows of the double-layer liquid hydrogen transfer flexible hose assembly 1 are composed of an inner tube spiral suction belt 1-2, a variable layer density insulation layer 1-3 and an outer tube spiral Hertz contact support 1-4. The inner tube spiral suction belt 1-2 has the characteristics of quickly capturing and releasing various gases and spiral supports in the transfer process, and forms a reverse symmetrical stable support structure with the outer tube spiral Hertz contact support 1-4. This structure can not only improve the vacuum degree between layers and reduce heat convection, but also reduce the heat conduction of liquid hydrogen and reduce the internal heat loss, and at the same time ensure the stability of the interlayer components; the variable layer density insulation layer 1-3 arranged between the double reverse spiral supports has a sparse inner layer that can effectively prevent heat conduction, and a dense outer layer that has the characteristics of anti-radiation heat transfer; this structure enables the low-temperature transfer pipeline to have the advantages of fast suction, high vacuum, low heat leakage and stable support along the radial section;

[0047] The double-layer sheath armor assembly 2 is composed of five layers: a non-metallic inner sheath 2-1, an inner tension armor wire 2-2, an intermediate sheath 2-3, an outer tension armor wire 2-4, and an outer sheath 2-5. The inner and outer tension armor wires are wound in opposite directions to ensure that the flexible hose still has a good protective effect on the double-layer liquid hydrogen transfer flexible hose assembly 1 under loads such as tension, compression, bending and twisting. In addition, under repeated large temperature difference thermal shock loads such as transfer precooling, transfer working conditions and shutdown, the double-layer sheath armor assembly 2 has the axial anti-instability feature of the double-layer liquid hydrogen transfer flexible hose assembly 1. The inner, middle and outer three-layer non-metallic sheath separates the metal parts to avoid metal friction and wear, and can also effectively avoid unsafe factors such as electric sparks caused by direct metal contact and collision.

[0048] It is worth noting that the contents not described in detail in the embodiments of the present invention belong to the prior art known to professional and technical personnel in the field.

[0049] To sum up, the structure described in the embodiment of the present invention can meet all requirements of high-vacuum and low-heat-leakage flexible transfer pipelines. Through the combination of the double-layer liquid hydrogen transfer flexible hose assembly and the double-layer sheath armor assembly, a high-vacuum and low-heat-leakage environment can be formed, and the double reverse spiral support can form a more stable structure. At the same time, the double-layer sheath armor can ensure that the flexible hose still has a good protection effect on the double-layer liquid hydrogen transfer flexible hose under various loads such as tension, compression, bending, torsion, and repeated large temperature difference thermal shock.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A low-leakage low-temperature medium flexible transfer pipeline structure, characterized in that: It comprises a double-layer liquid hydrogen transfer flexible hose assembly and a double-layer sheath armor assembly, wherein the double-layer liquid hydrogen transfer flexible hose assembly is inside, and the double-layer sheath armor assembly wraps the double-layer liquid hydrogen transfer flexible hose outside; The double-layer liquid hydrogen transfer flexible hose structure specifically includes an inner layer corrugated pipe, an inner pipe spiral air intake belt, a variable density insulation layer, an outer pipe spiral Hertz contact support, and an outer layer corrugated pipe, which are stacked from the inside to the outside in sequence, wherein: The inner tube spiral air suction belt is wound on the inner layer corrugated pipe in a spiral form, and the variable density insulation layer covers the inner tube spiral air suction belt and is fastened by the outer tube spiral Hertz contact support; the outer layer corrugated pipe is connected to the outer tube spiral Hertz contact support, one part is fixed support and the other part is movable support, and the inner tube spiral air suction belt and the outer spiral Hertz contact support are wound in reverse symmetry with each other; The double-layer sheath armor assembly specifically includes an inner sheath, an inner tension armor wire, an intermediate sheath, an outer tension armor wire, and an outer sheath stacked in sequence from the inside to the outside, and the inner sheath is transitionally matched with the outer corrugated tube, wherein: The inner tension armor wire is pressed tightly on the inner sheath, the middle sheath covers the inner tension armor wire, the outer tension armor wire is wound around the middle sheath, the inner tension armor wire and the outer tension armor wire are wound in opposite directions, and the outer sheath is pressed tightly on the outer tension armor wire as the outermost layer.

2. The low-leakage low-temperature medium flexible transfer pipeline structure according to claim 1 is characterized in that: The inner tube spiral suction belt can capture and release various gases in the transfer process and provide spiral support, which can meet the requirements of efficient adsorption and degassing; The variable density heat insulation layer and the outer tube spiral Hertz contact support can improve the vacuum degree between the double-layer tubes and reduce heat convection, while the Hertz contact can also reduce heat conduction.

3. The low-leakage low-temperature medium flexible transfer pipeline structure according to claim 2 is characterized in that: The inner tension armor wire and the outer tension armor wire are wound in opposite directions, so that the flexible hose can still have a good protective effect on the double-layer corrugated pipe under the load of tension, compression, bending and twisting and repeated large temperature difference thermal shock, and has the advantages of tension and compression resistance, anti-bending and twisting, and anti-instability; The inner sheath, the middle sheath and the outer sheath are non-metallic sheaths, which separate the metal parts, thereby avoiding metal friction and wear, and effectively avoiding the unsafe factor of electric sparks caused by direct contact and collision of metals.

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