Cold fluid pipeline and manufacturing method thereof
By setting up multiple layers of heat insulation and radiation-proof layers around the cold fluid inlet pipe of the cold fluid pipeline and wrapping the outer layer with an aluminum foil layer, the problem of poor insulation effect of existing cold fluid pipelines is solved, and efficient insulation and low-temperature transportation of cold fluid is achieved.
Patent Information
- Application Number
- CN202411635114.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-02-25
AI Technical Summary
The existing low-temperature cold liquid pipelines have poor insulation effect, which leads to an increase in the temperature of the cooling fluid in the tube, making it difficult to effectively transport at very low temperatures.
A cold fluid pipeline is designed. By setting multiple insulation layers and multiple radiation-proof layers in the circumference of the cold fluid inlet pipe, and setting insulation layers between two adjacent radiation-proof layers to form a multi-temperature ladder, and wrapping the aluminum foil layer on the outer layer to form a cold screen, improving the insulation function and the effect of the cold screen.
Through the multi-layer insulation function and the multi-temperature ladder cooling screen function, the insulation performance of the cold fluid pipeline to the cold fluid is significantly improved, heat transfer is reduced, and the low temperature state of the cold fluid is maintained.
Smart Images
Figure CN119508643A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of cryogenic cooling technology, and in particular to a cold fluid pipeline and a manufacturing method thereof. Background Art
[0002] Some instruments and equipment require cryogenic cooling, such as the cryogenic probe in the nuclear magnetic resonance equipment. The instrument and equipment transports the medium through the cryogenic cold liquid pipeline to cool the cryogenic probe. The medium transported by the cryogenic cold liquid pipeline is very special and needs to be transported at a very low temperature. For example, if the medium is liquid nitrogen, liquid nitrogen needs to be transported at a temperature of 77K; or if the medium is cold helium, cold helium needs to be transported at a temperature of 30K.
[0003] In the prior art, the low temperature cold liquid pipeline has a poor insulation effect, which causes the temperature of the cold fluid (such as liquid nitrogen, liquid helium and other liquid gases) in the pipeline to rise. How to solve the above technical problems is what the technicians in this field need to consider. Summary of the invention
[0004] The present application provides a cold fluid pipeline and a manufacturing method thereof to solve the problem of how to improve the thermal insulation performance of the pipeline for cold fluid.
[0005] The first aspect of the embodiment of the present application provides a cold fluid pipeline, including a cold fluid inlet pipe, a first insulation layer, a cold fluid return pipe and an aluminum foil layer. The cold fluid inlet pipe is used to transport cold fluid. The first insulation layer is arranged on the circumferential surface of the cold fluid inlet pipe, and the first insulation layer includes multiple insulation layers and multiple radiation protection layers. The insulation layer and the radiation protection layer are wrapped in sequence, and the insulation layer is arranged between two adjacent radiation protection layers to form multiple temperature steps in the circumferential direction of the cold fluid inlet pipe. The cold fluid return pipe is used to return the cold fluid after heat exchange, and the cold fluid return pipe is arranged on the side of the first insulation layer opposite to the cold fluid inlet pipe. The aluminum foil layer is used to wrap the first insulation layer and the cold fluid return pipe, and the aluminum foil layer contacts the surface of the cold fluid return pipe to form a cold shield.
[0006] Compared with the prior art, the cold fluid pipeline provided in this embodiment is provided with multiple insulation layers and multiple radiation protection layers in the circumferential direction of the cold fluid inlet pipe, and an insulation layer is provided between two adjacent radiation protection layers to reduce the heat transfer between the two adjacent radiation protection layers, and the temperature of the radiation protection layer close to the cold fluid inlet pipe position is lower, and the temperature of the radiation protection layer far from the cold fluid inlet pipe position is higher, so that the first insulation layer forms multiple temperature steps in the circumferential direction of the cold fluid inlet pipe; the aluminum foil layer wraps the first insulation layer and the cold fluid return pipe to form a cold shield, and the aluminum foil layer contacts the cold fluid return pipe for heat conduction, so that the temperature of the aluminum foil layer and the cold fluid return pipe is basically consistent, and the temperature difference between the cold fluid return pipe and the cold fluid inlet pipe is small, so the difference between the lowest temperature and the highest temperature of the multiple temperature steps is small, and according to the radiation heat transfer formula, it can be seen that the heat radiation amount of the first insulation layer is further reduced, so the cold fluid pipeline has a multi-level insulation function and a cold shield function of multiple temperature steps, so as to achieve the effect of improving the thermal insulation performance of the cold fluid pipeline for the cold fluid.
[0007] In a possible embodiment based on the first aspect, a surface of the radiation protection layer is bonded to a surface of the heat insulation layer.
[0008] In this embodiment, the surface of the radiation protection layer and the surface of the thermal insulation layer are attached to each other, which is beneficial to reducing the air medium between the radiation protection layer and the thermal insulation layer, reducing the temperature transferred by the air medium, and thus improving the thermal insulation performance of the first thermal insulation layer.
[0009] In a possible embodiment based on the first aspect, the first insulation layer is provided with an exhaust hole, the exhaust hole passes through the insulation layer and the radiation protection layer, and the exhaust hole is used to exhaust the air between the insulation layer and the radiation protection layer.
[0010] In this embodiment, the exhaust holes are used to evacuate the space between the thermal insulation layer and the radiation protection layer, and to evacuate the space between the first thermal insulation layer and the cold fluid inlet pipe, so as to reduce the temperature transferred by the air medium, thereby improving the thermal insulation performance of the first thermal insulation layer.
[0011] In a possible embodiment based on the first aspect, the heat insulation layer contacts a surface of the cold fluid inlet pipe.
[0012] In this embodiment, the thermal insulation layer is in contact with the surface of the cold fluid inlet pipe, and the anti-radiation layer is arranged on the side of the thermal insulation layer opposite to the cold fluid inlet pipe, thereby reducing the contact between the anti-radiation layer and the cold fluid inlet pipe and reducing the heat transfer between the anti-radiation layer and the cold fluid inlet pipe, thereby improving the thermal insulation performance of the first insulation layer.
[0013] In a possible embodiment based on the first aspect, the material of the radiation protection layer is aluminum foil, and the material of the heat insulation layer is glass fiber.
[0014] In this embodiment, the glass fiber has a heat-insulating property and the aluminum foil has a radiation-proof property, so as to improve the heat-insulating property and the radiation-proof property of the first heat-insulating layer, thereby improving the thermal insulation performance of the first heat-insulating layer.
[0015] In a possible embodiment based on the first aspect, the cold fluid pipeline further includes a second thermal insulation layer, and the second thermal insulation layer is arranged on a circumferential surface of the aluminum foil layer to form multiple temperature steps in a circumferential direction of the aluminum foil layer.
[0016] In this embodiment, the second insulation layer is arranged on the circumferential surface of the aluminum foil layer so that multiple temperature steps are formed in the circumferential direction of the aluminum foil layer. The heat radiation of the aluminum foil layer is further reduced, thereby keeping the aluminum foil layer warm. This is beneficial for the aluminum foil layer to keep the first insulation layer and the cold fluid return pipe warm, so as to achieve the effect of improving the insulation performance of the cold fluid pipeline for the cold fluid.
[0017] In a possible embodiment based on the first aspect, the cold fluid pipeline further includes a shell, the shell is hollow to form a vacuum chamber, and the cold fluid inlet pipe and the first insulation layer are arranged in the vacuum chamber.
[0018] In this embodiment, a vacuum chamber is provided in the shell of the cold fluid pipeline, and the vacuum environment is conducive to reducing the heat transfer of the cold fluid into the pipe, so as to achieve the effect of improving the thermal insulation performance of the pipeline for the cold fluid.
[0019] A second aspect of an embodiment of the present application provides a method for manufacturing a cold fluid pipeline, comprising providing the cold fluid pipeline, winding the first thermal insulation layer around the circumference of the cold fluid inlet pipe, wherein the thermal insulation layer is in contact with the surface of the cold fluid inlet pipe, the thermal insulation layer and the radiation protection layer are wound in multiple layers in sequence, the radiation protection layer is wound between two adjacent thermal insulation layers, the cold fluid return pipe is arranged on the side of the first thermal insulation layer opposite to the cold fluid inlet pipe, and the aluminum foil layer wraps the first thermal insulation layer and the cold fluid return pipe.
[0020] Compared with the prior art in which the cold fluid pipeline adopts welding and other manufacturing processes, the cold fluid pipeline of this embodiment adopts the operation method of winding the first insulation layer, which reduces the manufacturing complexity and cost of the cold fluid pipeline.
[0021] In a possible embodiment based on the second aspect, before winding the first heat insulation layer, the outer surface of the cold fluid inlet pipe is pickled and passivated, and then the outer surface of the cold fluid inlet pipe is dried and cleaned.
[0022] In this embodiment, when the cold fluid pipeline is manufactured, the outer surface of the cold fluid inlet pipe is pickled and passivated, dried and cleaned to reduce the moisture, air, impurities and other media attached to the outer surface of the cold fluid inlet pipe, thereby reducing the medium transfer temperature and improving the thermal insulation performance of the first insulation layer.
[0023] In a possible embodiment based on the second aspect, the cold fluid inlet pipe further includes a second thermal insulation layer, and the second thermal insulation layer is wrapped around the circumference of the aluminum foil layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0025] Figure 1 It is a three-dimensional schematic diagram of a cold fluid pipeline according to an embodiment of the present application;
[0026] Figure 2 for Figure 1 Schematic cross-section of the cold fluid pipeline.
[0027] Description of main component symbols:
[0028] 1. cold fluid pipeline; 11. cold fluid inlet pipe; 12. first thermal insulation layer; 121. exhaust hole; 13. cold fluid return pipe; 14. shell; 141. vacuum chamber; 15. aluminum foil layer; 16. second thermal insulation layer. DETAILED DESCRIPTION
[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.
[0030] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.
[0031] Example
[0032] See also Figure 1 and Figure 2As shown, the first aspect of this embodiment provides a cold fluid pipeline 1, including a cold fluid inlet pipe 11, a first insulation layer 12, a cold fluid return pipe 13 and an aluminum foil layer 15. The cold fluid inlet pipe 11 is used to transport cold fluid. The first insulation layer 12 is arranged on the circumference of the cold fluid inlet pipe 11, and the first insulation layer 12 includes multiple insulation layers and multiple radiation protection layers. The insulation layers and the radiation protection layers are wrapped in sequence, and an insulation layer is arranged between two adjacent radiation protection layers to form multiple temperature steps in the circumference of the cold fluid inlet pipe 11. The cold fluid return pipe 13 is used to return the cold fluid after heat exchange, and the cold fluid return pipe 13 is arranged on the side of the first insulation layer 12 opposite to the cold fluid inlet pipe 11. The aluminum foil layer 15 is used to wrap the first insulation layer 12 and the cold fluid return pipe 13, and the aluminum foil layer 15 contacts the surface of the cold fluid return pipe 13 to form a cold shield.
[0033] The cold fluid pipeline 1 provided in this embodiment is provided with a plurality of heat insulation layers and a plurality of radiation protection layers in the circumference of the cold fluid inlet pipe 11, and a heat insulation layer is provided between two adjacent radiation protection layers to reduce the heat transfer between the two adjacent radiation protection layers, and the temperature of the radiation protection layer close to the cold fluid inlet pipe 11 is lower, and the temperature of the radiation protection layer far from the cold fluid inlet pipe 11 is higher, so that the first heat insulation layer 12 forms multiple temperature steps in the circumference of the cold fluid inlet pipe 11; the aluminum foil layer 15 wraps the first heat insulation layer 12 and the cold fluid return pipe 13 to A cold shield is formed, and the aluminum foil layer 15 contacts and conducts heat with the cold fluid return pipe 13, so that the temperature of the aluminum foil layer 15 and the cold fluid return pipe 13 are basically consistent, and the temperature difference between the cold fluid return pipe 13 and the cold fluid inlet pipe 11 is small, so the difference between the lowest temperature and the highest temperature of the multiple temperature steps is small. According to the radiation heat transfer formula, the heat radiation amount of the first insulation layer 12 is further reduced, so the cold fluid pipeline has a multi-level insulation function and a cold shield function of multiple temperature steps to improve the thermal insulation performance of the cold fluid pipeline 1 for the cold fluid.
[0034] After research, it was found that heat transfer is an important factor causing the temperature change of the cold fluid in the cold fluid pipeline 1. Heat transfer is often a composite process of multiple heat transfer methods. For example, an object has both heat conduction, convection and radiation. Among them, radiation heat transfer is carried out by electromagnetic wave radiation and does not require a material medium. The specific radiation heat transfer formula can be given according to the Stefan-Boltzmann law: q = εσA (T 4 sT 4 ∞), q is the amount of radiant heat transferred through the surface area A per unit time, ε is the emissivity (a dimensionless value that characterizes the radiation capacity of a surface), σ is the Stefan-Boltzmann constant, Ts is the surface temperature, and T∞ is the far-field / ambient temperature. The Stefan-Boltzmann law states that the amount of radiant heat is proportional to the fourth power of the surface temperature, which means that a small temperature increase can significantly increase the radiative heat transfer rate.
[0035] In this embodiment, the cold fluid return pipe 13 is used to return the cold fluid after the heat exchange. Compared with 0°C, the temperature of the cold fluid return pipe 13 is closer to the temperature of the cold fluid inlet pipe 11. The aluminum foil layer 15 is in contact with the cold fluid return pipe 13 for heat conduction, so that the temperature difference between the aluminum foil layer 15 and the cold fluid inlet pipe 11 is small. The cold fluid pipeline 1 is provided with multiple insulation layers and multiple radiation protection layers, and an insulation layer is provided between two adjacent radiation protection layers. The temperature difference between the two adjacent radiation protection layers is small, thereby reducing the radiant heat of the first insulation layer 12 to improve the thermal insulation performance of the pipeline for the cold fluid. Preferably, 12 layers of insulation layers and 12 layers of radiation protection layers are sequentially wrapped around the circumference of the cold fluid inlet pipe 11, so that the temperature of the two adjacent radiation protection layers can be reduced and the wrapping cost of the first insulation layer 12 can be reduced.
[0036] In a possible embodiment based on the first aspect, a surface of the radiation protection layer is bonded to a surface of the heat insulation layer.
[0037] In this embodiment, the surface of the radiation protection layer and the surface of the thermal insulation layer are relatively large, so the surface of the radiation protection layer and the surface of the thermal insulation layer will absorb a large amount of gas, and the gas will transfer heat, which is not conducive to the thermal insulation performance of the first thermal insulation layer 12. The surface of the radiation protection layer and the surface of the thermal insulation layer are attached to each other, which is conducive to reducing the air medium between the radiation protection layer and the thermal insulation layer, reducing the temperature transferred by the air medium, and thus improving the thermal insulation performance of the first thermal insulation layer 12.
[0038] In a possible embodiment based on the first aspect, the first insulation layer 12 is provided with an exhaust hole 121, the exhaust hole 121 penetrates the insulation layer and the radiation protection layer, and the exhaust hole 121 is used to exhaust the air between the insulation layer and the radiation protection layer.
[0039] In this embodiment, the exhaust holes 121 are used to evacuate between the heat insulating layer and the radiation protection layer, and to evacuate between the first heat insulating layer 12 and the cold fluid inlet pipe 11, so as to reduce the temperature transferred by the air medium, thereby improving the thermal insulation performance of the first heat insulating layer 12. After the first heat insulating layer 12 is wrapped, a steel needle (with a diameter of 3 to 5 mm) is used to pierce a plurality of exhaust holes 121 (one exhaust hole 121 for every 15 mm×15 mm) on the surface of the first heat insulating layer 12 obliquely (at an angle with the center line of the cold fluid inlet pipe 11), and the positions of the exhaust holes 121 are distributed as evenly as possible to facilitate interlayer exhaust and vacuuming.
[0040] In a possible embodiment based on the first aspect, the heat insulation layer contacts the surface of the cold fluid inlet pipe 11 .
[0041] In this embodiment, the material of the thermal insulation layer is glass fiber, and the material of the anti-radiation layer is aluminum foil. The anti-radiation layer is arranged on the side of the thermal insulation layer opposite to the cold fluid inlet pipe 11, thereby reducing the contact between the anti-radiation layer and the cold fluid inlet pipe 11, reducing the heat transfer between the anti-radiation layer and the cold fluid inlet pipe 11, thereby improving the thermal insulation performance of the first insulation layer 12.
[0042] In this embodiment, the glass fiber does not absorb water, does not contain volatiles, and has good thermal insulation performance. The aluminum foil has radiation protection performance to improve the thermal insulation and radiation protection of the first insulation layer 12, thereby improving the thermal insulation performance of the first insulation layer 12. The aluminum foil can reflect thermal radiation and prevent frost from forming on the surface of the pipeline. At the same time, it can also block external water vapor and oxygen, thereby improving the thermal insulation performance of the first insulation layer 12. Through experiments, the number of layers of aluminum foil affects the thermal insulation effect. The number of layers of aluminum foil per unit thickness is called layer density. When the layer density increases, the radiation heat transfer decreases, but the contact thermal resistance also decreases, and the heat conduction will increase. This has an optimal layer density. According to experience, the layer density should be 40 layers / 8mm. Therefore, the first insulation layer 12 should be moderately tight, and the winding layer at the bottom of the cold fluid inlet pipe 11 should not have a sagging fish belly phenomenon.
[0043] In an embodiment based on the first aspect, the cold fluid pipeline 1 further includes a sealing plate, which is arranged at an end of the first thermal insulation layer 12 , and an end surface of the sealing plate is in contact with an end surface of the first thermal insulation layer 12 .
[0044] In this embodiment, the end surface of the first insulation layer 12 is fitted with the end surface of the sealing plate to reduce heat transfer at the end surface of the first insulation layer 12, thereby improving the thermal insulation performance of the first insulation layer 12. When the sealing plate is assembled, the end surface of the sealing plate contacts the end surface of the first insulation layer 12, thereby improving the thermal insulation performance of the first insulation layer 12.
[0045] In a possible embodiment based on the first aspect, the cold fluid pipeline 1 further includes a second thermal insulation layer 16 , which is disposed on a circumferential surface of the aluminum foil layer 15 to form multiple temperature steps in a circumferential direction of the aluminum foil layer 15 .
[0046] In this embodiment, the second insulation layer 16 is arranged on the circumferential surface of the aluminum foil layer 15 so that multiple temperature steps are formed in the circumferential direction of the aluminum foil layer 15, and the heat radiation of the aluminum foil layer 15 is further reduced, thereby keeping the aluminum foil layer 15 warm. This is beneficial for the aluminum foil layer 15 to keep the first insulation layer 12 and the cold fluid return pipe 13 warm, so as to improve the insulation performance of the cold fluid pipeline 1 for the cold fluid.
[0047] Preferably, the first insulation layer 12 is first wrapped around the circumference of the cold fluid inlet pipe 11, and the first insulation layer 12 includes 12 insulation layers and 12 radiation protection layers. Then, the first insulation layer 12 and the cold fluid return pipe 1313 are wrapped with an aluminum foil layer 15, and then the second insulation layer 16 is wrapped around the circumference of the aluminum foil layer 15. The second insulation layer 16 includes 12 insulation layers and 12 radiation protection layers. This is conducive to reducing the heat radiation of the first insulation layer 12 and the cold fluid return pipe 13, thereby improving the thermal insulation performance of the cold fluid pipeline 1 for the cold fluid.
[0048] In a possible embodiment based on the first aspect, the cold fluid pipeline 1 further includes a shell 14 , the shell 14 is hollow to form a vacuum chamber 141 , and the cold fluid inlet pipe 11 and the first insulation layer 12 are arranged in the vacuum chamber 141 .
[0049] In this embodiment, a vacuum chamber 141 is provided in the shell 14 of the cold fluid pipeline 1. The vacuum environment is conducive to reducing the heat transfer of the cold fluid inlet pipe 11, so as to achieve the effect of improving the thermal insulation performance of the pipeline for the cold fluid.
[0050] It can be understood that, assuming that the temperature of the vacuum chamber 141 is 0°C and the temperature of the cold fluid inlet pipe 11 is -100°C, in the absence of the cold fluid return pipe 13 and the first insulation layer 12, according to the radiation heat transfer formula, the heat radiation amount of the cold fluid inlet pipe 11 is q1=1004-04; in the presence of the cold fluid return pipe 13, the cold fluid return pipe 13 is arranged in the vacuum chamber 141, assuming that the temperature of the cold fluid return pipe 13 is -50°C, then the heat radiation amount of the cold fluid inlet pipe 11 is q 2=1004-504;Furthermore, a first heat insulating layer 12 (12 heat insulating layers and 12 radiation protection layers) is wrapped between the cold fluid return pipe 13 and the cold fluid inlet pipe 11, and the temperature range of the first heat insulating layer 12 from the cold fluid return pipe 13 to the cold fluid inlet pipe 11 is between -50℃ and -100℃, and the temperature of the first heat insulating layer 12 closest to the cold fluid inlet pipe 11 is assumed to be -98℃, then the heat radiation amount of the cold fluid inlet pipe 11 q3=1004-984. It can be seen that the first heat insulating layer 12 arranged on the circumference of the cold fluid inlet pipe 11 greatly reduces the heat radiation amount of the cold fluid inlet pipe 11.
[0051] The second aspect of the embodiment of the present application provides a method for manufacturing a cold fluid pipeline 1, including the provided cold fluid pipeline 1, wherein a first insulation layer 12 is wound around the circumference of a cold fluid inlet pipe 11, wherein the insulation layer contacts the surface of the cold fluid inlet pipe 11, the insulation layer and the radiation protection layer are wound in multiple layers in sequence, the radiation protection layer is wound between two adjacent insulation layers, the cold fluid return pipe 13 is arranged on the side of the first insulation layer 12 opposite to the cold fluid inlet pipe 11, and the aluminum foil layer 15 wraps the first insulation layer 12 and the cold fluid return pipe 13. The first insulation layer 12 is provided with an exhaust hole 121, the exhaust hole 121 penetrates the insulation layer and the radiation protection layer, and the air between the insulation layer and the radiation protection layer is extracted from the exhaust hole 121. The cold fluid inlet pipe 11 also includes a second insulation layer 16, and the second insulation layer 16 is wrapped around the circumference of the aluminum foil layer 15.
[0052] Compared with the cold fluid pipeline 1 in the prior art which adopts welding and other manufacturing processes, the cold fluid pipeline 1 of this embodiment adopts the operation method of winding the first insulation layer 12, so that the manufacturing complexity and cost of the cold fluid pipeline 1 are reduced.
[0053] In a possible embodiment based on the second aspect, before winding the first heat insulation layer 12 , the outer surface of the cold fluid inlet pipe 11 is pickled and passivated, and then the outer surface of the cold fluid inlet pipe 11 is dried and cleaned.
[0054] In this embodiment, the outer surface of the cold fluid inlet pipe 11 is pickled and passivated, and then the outer surface of the cold fluid inlet pipe 11 is dried and cleaned. After the cold fluid inlet pipe 11 passes the leak detection, the outer surface of the cold fluid inlet pipe 11 is pickled and passivated. After passing the inspection, it is dried at a temperature of 120°C and a drying time of 4 hours. Then, the outer surface of the cold fluid inlet pipe 11 is carefully scrubbed with acetone or anhydrous alcohol. Finally, a clean and dry white filter paper is used to wipe the treated surface. After there is no obvious stain on the paper, it is sent to the winding room to wait for winding. The first insulation layer 12 for winding should be placed in a constant temperature furnace for drying and degreasing. The temperature in the furnace should be uniform and maintained at (70±5)°C. The drying time should generally not be less than 5 hours. The surface of the aluminum foil is a rolled surface, which should be flat and clean. Defects that affect use, such as corrosion, holes, folds, and cracks, are not allowed.
[0055] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.
Claims
1. A cold fluid pipeline, characterized in that: include: A cold fluid inlet pipe, used for conveying cold fluid; A first heat-insulating layer is arranged on the circumference of the cold fluid inlet pipe, the first heat-insulating layer comprises a plurality of heat-insulating layers and a plurality of radiation-proof layers, the heat-insulating layers and the radiation-proof layers are wrapped in sequence, and the heat-insulating layer is arranged between two adjacent radiation-proof layers, so as to form multiple temperature steps in the circumference of the cold fluid inlet pipe; A cold fluid return pipe, used to return the cold fluid after heat exchange, the cold fluid return pipe being arranged on a side of the first thermal insulation layer opposite to the cold fluid inlet pipe; An aluminum foil layer is used to wrap the first heat insulating layer and the cold fluid return pipe, and the aluminum foil layer is in contact with the surface of the cold fluid return pipe to form a cold shield.
2. The cold fluid pipeline according to claim 1, characterized in that: The surface of the radiation protection layer is in contact with the surface of the heat insulation layer.
3. The cold fluid pipeline according to claim 1 or 2, characterized in that: The first heat-insulating layer is provided with an exhaust hole, the exhaust hole runs through the heat-insulating layer and the radiation-proof layer, and the exhaust hole is used to exhaust the air between the heat-insulating layer and the radiation-proof layer.
4. The cold fluid pipeline according to claim 1, characterized in that: The heat insulating layer contacts the surface of the cold fluid inlet pipe.
5. The cold fluid pipeline according to claim 1, characterized in that: The material of the radiation protection layer is aluminum foil, and the material of the heat insulation layer is glass fiber.
6. The cold fluid pipeline according to claim 1, characterized in that: The cold fluid pipeline also includes a second thermal insulation layer, which is arranged on the circumferential surface of the aluminum foil layer to form multiple temperature steps in the circumferential direction of the aluminum foil layer.
7. The cold fluid pipeline according to claim 1, characterized in that: The cold fluid pipeline further comprises a shell, the shell is hollow to form a vacuum chamber, and the cold fluid inlet pipe and the first heat insulation layer are arranged in the vacuum chamber.
8. A method for manufacturing a cold fluid pipeline, characterized in that: include: A cold fluid pipeline according to any one of claims 1 to 7 is provided, wherein the first thermal insulation layer is wrapped around the circumference of the cold fluid inlet pipe, wherein the thermal insulation layer is in contact with the surface of the cold fluid inlet pipe, the thermal insulation layer and the radiation protection layer are wound in multiple layers in sequence, the radiation protection layer is wound between two adjacent thermal insulation layers, the cold fluid return pipe is arranged on a side of the first thermal insulation layer opposite to the cold fluid inlet pipe, and the aluminum foil layer wraps the first thermal insulation layer and the cold fluid return pipe.
9. The method for manufacturing a cold fluid pipeline according to claim 8, characterized in that: Before winding the first heat insulating layer, the outer surface of the cold fluid inlet pipe is subjected to pickling and passivation treatment, and then the outer surface of the cold fluid inlet pipe is dried and cleaned.
10. The method for manufacturing a cold fluid pipeline according to claim 8, characterized in that: The cold fluid inlet pipe also includes a second heat insulating layer, and the second heat insulating layer is wrapped around the circumference of the aluminum foil layer.