A sandwich low heat conduction support structure for ultra-low temperature medium and ultra-low temperature medium container

Abstract

The present invention discloses a sandwich low heat conduction support structure for ultra-low temperature medium and an ultra-low temperature medium container, which relates to the field of ultra-low temperature medium storage or transportation technology, including a tie rod, an annular transition plate, a radial sleeve and a sealing ring plate, wherein the sealing ring plate is arranged in an inner container, the tie rod is arranged horizontally, and one end of the tie rod is fixed on the sealing ring plate, and the other end passes through the side wall of the inner container and the side wall of the outer cylinder in sequence and is fixed on the outer wall of the outer cylinder, and the radial sleeve is sleeved on the tie rod, and one end of the radial sleeve is fixed on the sealing ring plate, and the other end passes through the side wall of the inner container and is fixed on the outer wall of the inner container through the annular transition plate. The beneficial effects of the present invention are applicable to ultra-low temperature medium storage containers with extremely high requirements for low temperature insulation performance, have the advantages of long thermal bridge and large thermal resistance, and have the effect of ultra-low heat leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-low temperature medium storage or transportation, and in particular to an interlayer low heat conduction support structure for ultra-low temperature medium and an ultra-low temperature medium container. Background Art

[0002] At present, vacuum insulated cryogenic storage and transportation pressure vessels such as conventional liquid nitrogen (77K grade) storage tanks, tank trucks or tank containers usually adopt a traditional sandwich support structure in which stainless steel materials and epoxy resin materials are combined. The purpose is to reduce the heat leakage caused by heat conduction in the sandwich support structure.

[0003] The insulation performance of cryogenic medium storage or transport containers generally depends on the amount of heat transfer between the inner container and the outer shell. Heat transfer mainly consists of three parts: heat conduction of the insulation layer, convection heat transfer of vacuum interlayer gas molecules, and heat conduction of interlayer pipes and supports. The mature high vacuum multi-layer winding insulation method solves the heat transfer caused by the first two methods, while the heat transfer of the interlayer support depends on the support material and support structure. Therefore, the optimized design of the interlayer support structure becomes the key to the good insulation performance of cryogenic liquid storage containers.

[0004] With the development of technology, the application of ultra-low temperature media has become increasingly widespread. For ultra-low temperature media storage and transportation pressure vessels with temperatures lower than liquid nitrogen, conventional support structures can no longer meet their stringent heat leakage requirements. Therefore, designing an ultra-low heat leakage sandwich support structure is the key to ensuring the normal use of storage and transportation containers. Summary of the invention

[0005] The object of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an interlayer low heat conduction support structure for ultra-low temperature medium and an ultra-low temperature medium container.

[0006] The technical solution of the present invention is as follows:

[0007] A sandwich low heat conduction support structure for ultra-low temperature medium, which is arranged in an ultra-low temperature medium container, the ultra-low temperature medium container includes an inner container and an outer cylinder, and is characterized in that it includes a pull rod, an annular transition plate, a radial sleeve and a sealing ring plate, the sealing ring plate is arranged in the inner container, the pull rod is arranged horizontally, and one end of the pull rod is fixed on the sealing ring plate, and the other end passes through the side wall of the inner container and the side wall of the outer cylinder in sequence and is fixed to the outer wall of the outer cylinder, the radial sleeve is sleeved on the pull rod, and one end of the radial sleeve is fixed on the sealing ring plate, and the other end passes through the side wall of the inner container and is fixed to the outer wall of the inner container through the annular transition plate.

[0008] A specific embodiment of the present invention also includes an annular thermal insulation member, a columnar support and a cover plate, wherein the columnar support is arranged through the outer cylinder, the annular thermal insulation member is arranged inside the columnar support, the pull rod is located at one end of the outer cylinder and sequentially passes through the bottom wall of the columnar support and the annular thermal insulation member and is arranged in the columnar support, and the cover plate is arranged at the top end of the columnar support to seal the end of the pull rod in the columnar support.

[0009] A specific embodiment of the present invention further comprises a metal elastic element, wherein the metal elastic element is arranged in the columnar support and located outside the annular thermal insulation member, and the pull rod passes through the metal elastic element.

[0010] A specific implementation manner of the present invention further comprises a radiation protection cover, which is arranged in the columnar support and sleeved on the end of the pull rod.

[0011] In a specific implementation manner of the present invention, the radiation protection cover is made of aluminum foil and glass fiber paper.

[0012] In a specific implementation manner of the present invention, a heat insulating wrapping layer is provided on the outer wall of the pull rod and the radial sleeve.

[0013] In a specific implementation manner of the present invention, the heat insulating wrapping layer is made of a combination of aluminum foil, glass fiber paper and flame retardant paper.

[0014] In a specific implementation manner of the present invention, the pull rod and the radial sleeve are both made of austenitic stainless steel.

[0015] A super-low temperature medium container comprises any of the above-mentioned interlayer low heat conduction support structures for super-low temperature medium.

[0016] In a specific embodiment of the present invention, the ultra-low temperature medium container is provided with four interlayer low thermal conductivity support structures for ultra-low temperature medium located in the same horizontal plane along the circumferential direction, wherein two of the interlayer low thermal conductivity support structures for ultra-low temperature medium are symmetrically arranged with the center line as the symmetry axis, and the angle with the center line is 30°, and the other two interlayer low thermal conductivity support structures for ultra-low temperature medium are also symmetrically arranged with the same center line as the symmetry axis, and the angle with the center line is 45°.

[0017] The present invention has at least one of the following beneficial effects:

[0018] The sandwich support structure for low-temperature media of the present invention can connect the tie rod and the radial sleeve into a heat conduction path through the annular transition plate and the sealing ring plate to form a series thermal resistance, and the tie rod and the radial sleeve are both made of austenitic stainless steel material, which has a small cross-sectional area and a longer length. Combined with the use of an annular thermal insulation member with ultra-low thermal conductivity as contact heat conduction, the thermal bridge of the entire sandwich low thermal conduction structure is long and the thermal resistance is large, while ensuring the strength of the tie rod. The thermal bridge and thermal resistance of the entire sandwich support structure for ultra-low temperature media are greatly increased, and the heat leakage of the structure is greatly reduced. The metal elastic element effectively solves the impact of temperature difference stress on the stainless steel tie rod, and the service life of the sandwich support structure is improved; the thermal radiation is effectively reduced by the thermal insulation wrap layer and the radiation protection cover, and the heat leakage is greatly reduced. In summary, the above structure makes the sandwich support structure for low-temperature media suitable for ultra-low temperature medium storage containers with extremely high requirements for low-temperature thermal insulation performance, and has the advantages of long thermal bridge and large thermal resistance, and has an insulation effect with ultra-low heat leakage.

[0019] The ultra-low temperature medium container of the present invention can be used to store or transport ultra-low temperature media with extremely high requirements for low-temperature insulation performance. The sandwich support structure for the low-temperature medium is distributed in a circumferential direction in the same vertical plane at a total of 4 locations. The upper 2 locations are symmetrical about the vertical center line and the angle between them is 30°, and the lower 2 locations are symmetrical about the vertical center line and the angle between them is 45°. The arrangement is reasonable to ensure that at least 2 pull rods bear the tension at the same time in any direction of movement, so that the strength of the sandwich support structure is guaranteed, the structural strength of the ultra-low temperature medium container is improved, and the insulation effect of ultra-low heat leakage is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0022] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of part B;

[0023] Figure numerals: 1. stainless steel pull rod, 2. annular transition plate, 3. radial sleeve, 4. sealing ring plate, 5. locking nut, 6. annular insulation member, 7. metal elastic element, 8. fastening nut, 9. columnar support, 10. radiation protection cover, 11. cover plate, 12. insulation wrapping layer, 13. inner container, 14. outer cylinder. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with specific examples, but the present invention is not limited to the following specific examples.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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 the present invention can be understood by specific circumstances.

[0027] like Figures 1 to 3 As shown, this embodiment provides a sandwich low heat conduction support structure for ultra-low temperature medium, and the support structure is arranged in an ultra-low temperature medium container. Generally speaking, the ultra-low temperature medium container includes an inner container 13 and an outer cylinder 14, and a vacuum interlayer is between the inner container 13 and the outer cylinder 14. The support structure is arranged in the ultra-low temperature medium container to play a supporting role and has a low heat conduction effect, thereby ensuring that the storage and transportation container can be used normally. The specific structure of the support structure is described in detail below.

[0028] The support structure includes a tie rod 1, an annular transition plate 2, a radial sleeve 3 and a sealing ring plate 4. The sealing ring plate 4 is arranged in the inner container 13. The tie rod 1 is arranged horizontally, and one end of the tie rod 1 passes through the side wall of the sealing ring plate 4 and is fixed on the sealing ring plate 4, and the other end passes through the side wall of the inner container 13 and the side wall of the outer cylinder 14 in sequence and is fixed on the outer wall of the outer cylinder 14. Specifically, both ends of the tie rod 1 are processed with fastening threads, and the head is stamped and tightened with a hexagon socket, so that the two ends of the tie rod 1 are respectively fixed by a locking nut 5 and a fastening nut 8. The radial sleeve 3 is sleeved on the tie rod 1. Specifically, the radial sleeve 3 is arranged between the sealing ring plate 4 and the inner container 13. One end of the radial sleeve 3 is fixed on the sealing ring plate 4, and the other end passes through the side wall of the inner container 13 and is fixed on the outer wall of the inner container 13 through the annular transition plate 2.

[0029] In this embodiment, the pull rod 1 and the radial sleeve 3 can be connected into a heat conduction path through the annular transition plate 2 and the sealing ring plate 4 to form a series thermal resistance, thereby effectively lengthening the thermal bridge and increasing the thermal resistance.

[0030] In this embodiment, an annular heat insulating member 6, a columnar support 9 and a cover plate 11 are also included. The columnar support 9 is set through the outer cylinder 14, and the annular heat insulating member 6 is set inside the columnar support 9. One end of the pull rod 1 located at the outer cylinder 14 passes through the bottom wall of the columnar support 9 and the annular heat insulating member 6 in sequence and is set in the columnar support 9. The annular heat insulating member 6 is fixed to the pull rod 1 by tightening the nut 8. The cover plate 11 is set at the top of the columnar support 9 to seal the end of the pull rod 1 in the columnar support 9. The annular heat insulating member 6 is in the ambient temperature range under normal working conditions, which greatly increases the range of ultra-low thermal conductivity materials that can be selected.

[0031] In this embodiment, a metal elastic element 7 is further included, and the metal elastic element 7 is arranged in the columnar support 9 and located outside the annular heat insulating member 6. The pull rod 1 passes through the metal elastic element 7, and the metal elastic element 7 is fixed to the pull rod 1 by a fastening nut 8. The metal elastic element 7 can make the stainless steel pull rod 1 withstand the temperature difference stress caused by the thermal expansion and contraction of the inner container, thereby effectively solving the influence of the temperature difference stress on the stainless steel pull rod and improving the service life of the sandwich support structure.

[0032] In this embodiment, a radiation protection cover 10 is also included, and the radiation protection cover 10 is arranged in the columnar support 9 and sleeved on the end of the pull rod 1. The radiation protection cover is made of a combination of aluminum foil and glass fiber paper, and covers the stainless steel pull rod 1 and the fastening nut 8, reflecting the radiated heat from the columnar support 9 and the cover plate 11, effectively reducing thermal radiation and greatly reducing heat leakage.

[0033] In this embodiment, the outer walls of the pull rod 1 and the radial sleeve 3 are both provided with a heat insulating wrapping layer 12. The heat insulating wrapping layer 12 is made of a combination of aluminum foil, glass fiber paper and flame retardant paper, which effectively reduces heat radiation.

[0034] In this embodiment, the tie rod 1 and the radial sleeve 3 are both made of austenitic stainless steel, with a small cross-sectional area and a longer length. Under the premise of ensuring the strength of the tie rod, the thermal bridge of the entire interlayer low heat conduction structure is long and the thermal resistance is large, which greatly reduces the heat leakage of the structure;

[0035] The support structure in this embodiment can connect the pull rod 1 and the radial sleeve 3 into a heat conduction path through the annular transition plate 2 and the sealing ring plate 4, forming a series thermal resistance, thereby effectively lengthening the thermal bridge and increasing the thermal resistance, and effectively solving the influence of temperature difference stress on the stainless steel pull rod through the metal elastic element, thereby improving the service life of the sandwich support structure, effectively reducing thermal radiation through the insulation wrap layer and the radiation protection cover, and greatly reducing the amount of heat leakage. The stainless steel pull rod 1 and the radial sleeve 3 have a small cross-sectional area and a long length, and are combined with an annular insulation member with ultra-low thermal conductivity as contact heat conduction, which greatly increases the thermal bridge and thermal resistance of the entire sandwich support structure for ultra-low temperature media, and achieves an insulation effect of ultra-low heat leakage, so that it can be used in ultra-low temperature medium storage or transportation containers, not only to play a supporting role, but also to achieve an insulation effect of ultra-low heat leakage.

[0036] like Figures 1 to 3 As shown, this embodiment also provides an ultra-low temperature medium container including the above-mentioned interlayer low thermal conductivity support structure for ultra-low temperature medium.

[0037] The ultra-low temperature medium container includes an inner container 13 and an outer cylinder 14, and a vacuum interlayer is formed between the inner container 13 and the outer cylinder 14. The sealing tube ring plate 4 is arranged in the inner container 13, and the tie rod 1 is arranged horizontally, and one end of the tie rod 1 penetrates the side wall of the sealing tube ring plate 4 and is fixed on the sealing tube ring plate 4, and the other end penetrates the side wall of the inner container 13 and the side wall of the outer cylinder 14 in sequence and is fixed on the outer wall of the outer cylinder 14. Specifically, both ends of the tie rod 1 are processed with fastening connection threads, and the head is stamped and tightened with a hexagon socket, so that the two ends of the tie rod 1 are respectively fixed by a locking nut 5 and a fastening nut 8. The radial sleeve 3 is sleeved on the tie rod 1. Specifically, the radial sleeve 3 is arranged between the sealing tube ring plate 4 and the inner container 13, one end of the radial sleeve 3 is fixed on the sealing tube ring plate 4, and the other end penetrates the side wall of the inner container 13 and is fixed on the outer wall of the inner container 13 through the annular transition plate 2. The cylindrical support 9 is arranged through the outer cylinder 14, the annular heat insulating member 6 is arranged inside the cylindrical support 9, and the pull rod 1 is arranged in the cylindrical support 9 at one end of the outer cylinder 14, which passes through the bottom wall of the cylindrical support 9 and the annular heat insulating member 6 in sequence. The annular heat insulating member 6 is fixed to the pull rod 1 by the fastening nut 8, and the cover plate 11 is arranged at the top of the cylindrical support 9 to seal the end of the pull rod 1 in the cylindrical support 9. The annular heat insulating member 6 is in the ambient temperature range under normal working conditions, which greatly increases the range of ultra-low thermal conductivity materials that can be selected. The metal elastic element 7 is arranged in the cylindrical support 9 and is located outside the annular heat insulating member 6. The pull rod 1 passes through the metal elastic element 7, and the metal elastic element 7 is fixed to the pull rod 1 by the fastening nut 8. The stainless steel pull rod 1 can be subjected to the temperature difference stress caused by the thermal expansion and contraction of the inner container through the metal elastic element 7, thereby effectively solving the influence of the temperature difference stress on the stainless steel pull rod and improving the service life of the sandwich support structure. The radiation protection cover 10 is arranged in the columnar support 9 and is sleeved on the end of the tie rod 1. The radiation protection cover is made of a combination of aluminum foil and glass fiber paper, and covers the stainless steel tie rod 1 and the fastening nut 8, reflecting the radiated heat from the columnar support 9 and the cover plate 11, effectively reducing thermal radiation and greatly reducing heat leakage. The outer walls of the tie rod 1 and the radial sleeve 3 are both provided with an insulating wrapping layer 12. The insulating wrapping layer 12 is made of a combination of aluminum foil, glass fiber paper and flame retardant paper, which effectively reduces thermal radiation. The tie rod 1 and the radial sleeve 3 are both made of austenitic stainless steel, with a small cross-sectional area and a longer length. Under the premise of ensuring the strength of the tie rod, the thermal bridge of the entire interlayer low heat conduction structure is long and the thermal resistance is large, which greatly reduces the heat leakage of the structure;

[0038] In this embodiment, the ultra-low temperature medium container is provided with four interlayer low thermal conductivity support structures for ultra-low temperature medium located in the same horizontal plane along the circumferential direction, wherein two of the interlayer low thermal conductivity support structures for ultra-low temperature medium are symmetrically arranged with the center line as the symmetry axis, and the angle with the center line is α, α is equal to 30°, and the other two interlayer low thermal conductivity support structures for ultra-low temperature medium are also symmetrically arranged with the same center line as the symmetry axis, and the angle with the center line is β, β is equal to 45°, thereby ensuring that at least two pull rods 1 bear tension at the same time in any movement direction, and the strength of the interlayer support structure is guaranteed.

[0039] The ultra-low temperature medium container in this embodiment has a stable structure and has a heat insulation effect with ultra-low heat leakage.

[0040] The above are only examples of the features of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent exchange or equivalent replacement falls within the protection scope of the present invention.

Claims

1. A sandwich low heat conduction support structure for ultra-low temperature medium, which is arranged in an ultra-low temperature medium container, wherein the ultra-low temperature medium container comprises an inner container (13) and an outer cylinder (14), characterized in that: The invention comprises a pull rod (1), an annular transition plate (2), a radial sleeve (3), a sealing tube ring plate (4), an annular heat insulating member (6), a metal elastic element (7), a columnar support (9), a radiation protection cover (10) and a cover plate (11); the sealing tube ring plate (4) is arranged in an inner container (13); the pull rod (1) is arranged transversely, and one end of the pull rod (1) is fixed on the sealing tube ring plate (4), and the other end passes through the side wall of the inner container (13) and the side wall of the outer cylinder (14) in sequence and is fixed on the outer wall of the outer cylinder (14); the radial sleeve (3) is sleeved on the pull rod (1), and one end of the radial sleeve (3) is fixed on the sealing tube ring plate (4), and the other end passes through the side wall of the inner container (13) and is fixed on the outer wall of the inner container (13) through the annular transition plate (2); the columnar support The seat (9) is arranged on the outer cylinder (14), the annular heat insulating member (6) is arranged inside the columnar support (9), the pull rod (1) is located at one end of the outer cylinder (14) and sequentially passes through the bottom wall of the columnar support (9) and the annular heat insulating member (6) and is arranged in the columnar support (9), the cover plate (11) is arranged at the top of the columnar support (9) and seals the end of the pull rod (1) in the columnar support (9), the metal elastic element (7) is arranged in the columnar support (9) and is located on the outside of the annular heat insulating member (6), the pull rod (1) is arranged through the metal elastic element (7), the radiation protection cover (10) is arranged in the columnar support (9) and is sleeved on the end of the pull rod (1), and the outer walls of the pull rod (1) and the radial sleeve (3) are provided with an insulating winding layer (12).

2. The sandwich low thermal conductivity support structure for ultra-low temperature medium according to claim 1, characterized in that: The radiation protection cover (10) is made of aluminum foil and glass fiber paper.

3. The sandwich low thermal conductivity support structure for ultra-low temperature medium according to claim 1, characterized in that: The heat insulating wrapping layer (12) is made of a combination of aluminum foil, glass fiber paper and flame retardant paper.

4. The sandwich low thermal conductivity support structure for ultra-low temperature medium according to claim 1, characterized in that: The pull rod (1) and the radial sleeve (3) are both made of austenitic stainless steel.

5. A cryogenic medium container, characterized in that: It comprises the interlayer low thermal conductivity support structure for ultra-low temperature medium as described in any one of claims 1 to 4.

6. The ultra-low temperature medium container according to claim 5, characterized in that: The ultra-low temperature medium container is provided with four interlayer low thermal conductivity support structures for ultra-low temperature medium located in the same horizontal plane along the circumferential direction, wherein two of the interlayer low thermal conductivity support structures for ultra-low temperature medium are symmetrically arranged with the center line as the symmetry axis, and the angle between them and the center line is 30°, and the other two interlayer low thermal conductivity support structures for ultra-low temperature medium are also symmetrically arranged with the same center line as the symmetry axis, and the angle between them and the center line is 45°.

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