Liquid nitrogen tank
By filling the insulation material between the inner liner of the liquid nitrogen tank and the outer balloon, the cold transfer problem caused by the direct contact between the inner liner of the liquid nitrogen tank and the outer balloon is solved, the heat insulation effect is improved, and the manufacturing difficulty and cost are reduced.
Patent Information
- Application Number
- CN202422590868.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The direct connection between the inner and outer gallbladders of the existing liquid nitrogen tank leads to direct transmission of cold volume, reducing the heat insulation and cooling effect. At the same time, the welding requirements are high, manufacturing difficulty and cost increase.
The thermal insulation material with a slightly higher thermal conductivity coefficient is used to fill the inner liner and the outer liner of the liquid nitrogen tank to isolate the inner liner and the outer liner to avoid direct contact, and replace vacuum treatment.
It improves the thermal insulation effect, reduces welding requirements and manufacturing difficulty, and reduces the complexity and cost of the production process of liquid nitrogen tanks.
Smart Images
Figure CN223243103U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of superconducting technology, in particular to a liquid nitrogen tank. Background Art
[0002] Superconducting tapes are made into superconducting magnets, superconducting coils, superconducting cables and other superconducting materials due to their many advantages, such as strong current carrying capacity, low heat loss or even no heat loss. They are widely used in power transmission, large magnets and superconducting motors. In order to make the superconducting material present a superconducting state, the superconducting material can usually be immersed in liquid nitrogen for cooling to reach the critical temperature. The superconducting material produced needs to be analyzed and tested in advance to determine whether it meets the use standards. This includes testing the performance of superconducting materials in liquid nitrogen. In related technologies, liquid nitrogen can be stored in a liquid nitrogen tank. In order to prevent excessive cold energy from being transferred to other surrounding equipment and causing an impact, and to prevent a large amount of cold energy from being lost, resulting in excessive liquid nitrogen consumption, the liquid nitrogen tank also needs to have good heat insulation and cold preservation properties.
[0003] In order to minimize the loss of liquid nitrogen cooling capacity, a liquid nitrogen tank with an insulating cavity can be used. Since the vacuum heat conductivity is close to zero, the insulating cavity is often evacuated in the prior art. At the same time, in order to adapt to the temperature of liquid nitrogen and prevent the inner or outer liner from being deformed by cold, and at the same time have the strength to support the evacuation of the insulating cavity and require high reliability, stainless steel is often used to make the inner and outer liner of the liquid nitrogen tank, and the inner and outer liner are connected together by welding to form a closed insulating cavity, and the insulating cavity is evacuated. Although the cold preservation and heat insulation effects are guaranteed after vacuuming, because the inner and outer liner are directly connected and the stainless steel material has good thermal conductivity, the connection part will cause the cold to be directly transferred to the outer liner, which reduces the heat insulation and cold preservation effect of the liquid nitrogen tank to a certain extent. At the same time, because of the need to vacuumize, it is inevitable that the welding requirements will be increased and the welding difficulty will increase, which increases the manufacturing difficulty and cost. Summary of the Invention
[0004] The present application provides a liquid nitrogen tank to at least solve at least one technical problem existing in the related art.
[0005] The present application provides a liquid nitrogen tank, comprising: a liquid nitrogen tank liner, which is formed with a liquid nitrogen containing cavity and has a liquid nitrogen injection port; a liquid nitrogen tank outer liner, which is sleeved on the outside of the liquid nitrogen tank liner; and a heat insulating material, which is filled between the liquid nitrogen tank liner and the liquid nitrogen tank outer liner to support and isolate the liquid nitrogen tank liner and the liquid nitrogen tank outer liner from each other.
[0006] In one embodiment, the liquid nitrogen tank liner and the liquid nitrogen tank liner form a hollow portion at least at the side wall and the bottom, and the thermal insulation material fills at least a portion of the hollow portion.
[0007] In one embodiment, the insulating material comprises expanded polypropylene.
[0008] In one embodiment, the liquid nitrogen tank liner is an integrally formed stainless steel liner.
[0009] In one embodiment, the liquid nitrogen tank further includes a liquid nitrogen discharge pipe, which passes through the liquid nitrogen tank outer liner, the thermal insulation material and the liquid nitrogen tank inner liner in sequence and is connected to the liquid nitrogen holding chamber.
[0010] In one embodiment, a stop valve is further provided on the liquid nitrogen discharge pipe.
[0011] In one embodiment, the liquid nitrogen discharge pipe is connected to the liquid nitrogen tank liner through threads.
[0012] In one embodiment, the connection between the liquid nitrogen discharge pipe and the liquid nitrogen tank liner is coated with ultra-low temperature resistant epoxy glue.
[0013] In one embodiment, the liquid nitrogen discharge pipe is connected to the bottom of the liquid nitrogen containing chamber.
[0014] In one embodiment, the liquid nitrogen injection port is located at the top of the liquid nitrogen containing chamber.
[0015] This application has at least the following beneficial effects:
[0016] An insulating material with a slightly higher thermal conductivity coefficient is used to fill the space between the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank, so as to replace the vacuum treatment of the hollow part between the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank in the prior art. Although the thermal conductivity coefficient between the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank is increased, the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank are isolated by the insulating material, so that the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank are not in contact with each other, thereby avoiding direct heat transfer between the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank. In actual application, the insulating material isolates the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank to avoid direct contact, which has better thermal insulation effect than vacuuming in the prior art. At the same time, there is no need for high welding requirements and ensuring the leakage rate between the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank, thereby reducing the difficulty of welding the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank, and reducing the difficulty of the manufacturing process of the liquid nitrogen tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0019] Figure 1 This is a schematic diagram of the structure of a liquid nitrogen tank provided according to an embodiment of the present application.
[0020] Figure 2 This is a schematic cross-sectional view of another liquid nitrogen tank structure provided according to an embodiment of the present application.
[0021] Figure 3 This is a schematic cross-sectional view of another liquid nitrogen tank structure provided according to an embodiment of the present application.
[0022] Reference numerals
[0023] 1. Liquid nitrogen tank inner liner; 2. Liquid nitrogen tank outer liner; 3. Liquid nitrogen holding chamber; 4. Thermal insulation material; 5. Connecting block; 6. Sealing chamber; 7. Liquid nitrogen discharge pipe. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.
[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0026] like Figure 1-2As shown, an embodiment of the present application provides a liquid nitrogen tank, comprising: a liquid nitrogen tank liner 1, which is formed with a liquid nitrogen accommodating cavity 3 and has a liquid nitrogen injection port; a liquid nitrogen tank outer liner 2, which is sleeved on the outside of the liquid nitrogen tank liner 1, and a thermal insulation material 4 is filled between the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2. After filling, the thermal insulation material 4 simultaneously supports the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2, and isolates the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2, so that the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2 are not in contact.
[0027] In the present application, a heat insulating material 4 with a slightly higher heat conductivity coefficient is used to fill the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2 between the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2, so as to replace the prior art of vacuuming the hollow part between the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2. Although the heat conductivity between the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2 is increased, the heat insulating material 4 is used to isolate the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2, so that the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2 are separated. The inner liner 1 and the outer liner 2 of the liquid nitrogen tank are not in contact with each other, thereby avoiding direct heat transfer between the inner liner 1 of the liquid nitrogen tank and the outer liner 2 of the liquid nitrogen tank. In actual application, the thermal insulation material 4 isolates the inner liner 1 of the liquid nitrogen tank and the outer liner 2 of the liquid nitrogen tank to avoid direct contact therebetween. Compared with the vacuuming in the prior art, it has a better thermal insulation effect. At the same time, it does not require high welding requirements and ensure the leakage rate between the inner liner 1 of the liquid nitrogen tank and the outer liner 2 of the liquid nitrogen tank, thereby reducing the difficulty of welding the inner liner 1 of the liquid nitrogen tank and the outer liner 2 of the liquid nitrogen tank, and reducing the difficulty of the liquid nitrogen tank manufacturing process.
[0028] It should be noted that the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2 are isolated from each other, forming a hollow portion at least on their side walls and bottom, and the thermal insulation material 4 fills at least a portion of the hollow portion between the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2.
[0029] In this embodiment, the specific arrangement of the thermal insulation material 4 and the structural form that may be formed are not limited. It can be as described in the following embodiment, where the thermal insulation material 4 fills the hollow portion between the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2. The thermal insulation material 4 can also form a connecting block 5, and the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2 are connected by the connecting block 5. For example, the connecting block 5 can be arranged around the side wall, and the remaining side wall portion and the bottom form a relatively sealed hollow portion. The thermal insulation material and air can be used to form a thermal insulation layer between the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2, while preventing the inner and outer liner from contacting each other.
[0030] In another embodiment, the connecting block 5 is arranged around the side wall, that is, the connecting block 5 is arranged along part of the circumference of the side wall of the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2, so that the outer side of the liquid nitrogen tank liner 1 and the inner side of the liquid nitrogen tank outer liner 2 are connected together through the connecting block 5, and the remaining side wall parts and the hollow part of the bottom can form a relatively sealed sealed cavity, through airtightness treatment, such as interference fit between the connecting block 5 and the liquid nitrogen tank liner 1 and the liquid nitrogen tank outer liner 2, or further applying sealant between the connecting block 5 and the liquid nitrogen tank liner 1 and between the connecting block 5 and the liquid nitrogen tank outer liner 2, etc., to enhance airtightness, vacuum treatment can be performed to further improve the thermal insulation effect, and at the same time, there is no need to use a large amount of thermal insulation material 4, thereby saving costs.
[0031] Of course, the specific arrangement of the heat insulating material 4 and the structural form it may form may also be other forms not mentioned in this application that can isolate the liquid nitrogen tank inner liner 1 and the liquid nitrogen tank outer liner 2.
[0032] In one embodiment, the thermal insulation material 4 comprises foamed polypropylene.
[0033] The thermal conductivity coefficient of the foamed polypropylene material is less than 0.028W / (mk), and the foamed polypropylene can also be used as the material of the liquid nitrogen insulation box, so the foamed polypropylene can meet the thermal insulation requirements of the liquid nitrogen tank.
[0034] In one embodiment, the liquid nitrogen tank inner liner 1 can be an integrally formed stainless steel inner liner, and the liquid nitrogen tank outer liner 2 can also be an integrally formed stainless steel outer liner. This reduces the leakage rate of the liquid nitrogen tank inner liner 1 and the liquid nitrogen tank outer liner 2. In other embodiments, since the liquid nitrogen tank outer liner 2 does not require a high leakage rate for liquid nitrogen, and there is no need to vacuum between the liquid nitrogen tank inner liner 1 and the liquid nitrogen tank outer liner 2, the liquid nitrogen tank outer liner can be welded from sheet stainless steel to reduce manufacturing difficulty.
[0035] In one embodiment, if Figure 1-3 As shown, the liquid nitrogen tank further includes a liquid nitrogen discharge pipe 7, which passes through the liquid nitrogen tank outer liner 2, the thermal insulation material 3 and the liquid nitrogen tank inner liner 1 in sequence and is connected to the liquid nitrogen holding chamber 3. A stop valve is also provided on the liquid nitrogen discharge pipe.
[0036] like Figure 1-3 As shown, the liquid nitrogen discharge pipe 7 is arranged at the bottom end of the liquid nitrogen tank outer liner 2, and the liquid nitrogen injection port is located at the top of the liquid nitrogen holding chamber 3, which can facilitate the injection of liquid nitrogen into the liquid nitrogen holding chamber 3 and can smoothly discharge the liquid nitrogen.
[0037] At the same time, the liquid nitrogen injection port can also be set at the side end, or the top and side end of the liquid nitrogen tank formed by the nitrogen tank inner liner and the liquid nitrogen tank outer liner 2, and this application does not limit this.
[0038] In one embodiment, the liquid nitrogen discharge pipe 7 is connected to the liquid nitrogen tank liner 1 through a thread. In order to reduce the liquid nitrogen leakage rate, ultra-low temperature resistant epoxy glue is applied at the connection between the liquid nitrogen discharge pipe 7 and the liquid nitrogen tank liner 1.
[0039] When there is no need to vacuum between the liquid nitrogen tank inner liner 1 and the liquid nitrogen tank outer liner 2, there is no need to seal the liquid nitrogen discharge pipe 7 and the liquid nitrogen tank outer liner 2, which reduces the difficulty of the manufacturing process.
[0040] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.
[0041] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.
[0042] The above is merely an exemplary embodiment of the present application. It should be noted that a person skilled in the art may make several improvements and modifications without departing from the principles of the present application, and these improvements and modifications should also be considered within the scope of protection of the present application.
Claims
1. A liquid nitrogen tank, characterized in that: include: The liquid nitrogen tank liner is formed with a liquid nitrogen containing cavity and has a liquid nitrogen injection port; The outer liner of the liquid nitrogen tank is sleeved on the outer side of the inner liner of the liquid nitrogen tank; The heat insulating material is filled between the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank, and supports the inner liner of the liquid nitrogen tank and the outer liner of the liquid nitrogen tank to isolate each other.
2. The liquid nitrogen tank according to claim 1, wherein The liquid nitrogen tank liner and the liquid nitrogen tank liner form a hollow portion at least at the side wall and the bottom, and the heat insulation material fills at least a portion of the hollow portion.
3. The liquid nitrogen tank according to claim 1, wherein The thermal insulation material includes expanded polypropylene.
4. The liquid nitrogen tank according to claim 1, wherein The liquid nitrogen tank liner is an integrally formed stainless steel liner.
5. The liquid nitrogen tank according to claim 1, wherein It also includes a liquid nitrogen discharge pipe, which passes through the liquid nitrogen tank outer liner, the thermal insulation material and the liquid nitrogen tank inner liner in sequence and is connected to the liquid nitrogen containing chamber.
6. The liquid nitrogen tank according to claim 5, wherein A stop valve is also provided on the liquid nitrogen discharge pipe.
7. The liquid nitrogen tank according to claim 5, wherein The liquid nitrogen discharge pipe is connected to the liquid nitrogen tank liner through threads.
8. The liquid nitrogen tank according to claim 5, wherein The connection between the liquid nitrogen discharge pipe and the liquid nitrogen tank liner is coated with ultra-low temperature resistant epoxy glue.
9. The liquid nitrogen tank according to claim 5, wherein The liquid nitrogen discharge pipe is communicated with the bottom of the liquid nitrogen containing chamber.
10. The liquid nitrogen tank according to claim 1, wherein The liquid nitrogen injection port is located at the top of the liquid nitrogen containing chamber.