Split tank multilayer structure and method of construction thereof

Abstract

The application provides a split type storage tank multi-layer structure and a construction method thereof, which comprises the following multi-layers: an upper cap type multi-layer, an upper spherical segment petal type multi-layer, a column segment multi-layer, a lower spherical segment petal type multi-layer and a lower cap type multi-layer; the multi-layers and the covered body are fixed by using double-sided pressure sensitive adhesive and nylon buckles, and the multi-layers are mutually overlapped and the joints are fixed by using metalized plastic film adhesive tape. The application adopts three-dimensional design to tailor the storage tank, greatly improves the adhesion between the multi-layers and the storage tank, makes the multi-layer film smooth, bright and wrinkle-free, greatly guarantees the optical properties of the multi-layer film, and solves the problem that the local compression caused by the discomfort between the multi-layers and the covered body leads to the decline of the heat insulation performance. In addition, the better adhesion reduces the mechanical response of the multi-layers in the satellite launching process, so that the multi-layers are less likely to be damaged.

Description

Technical Field

[0001] This invention relates to the field of thermal control technology, specifically to a multi-layered structure of a split-type storage tank and its construction method. More specifically, it relates to a multi-layered, three-dimensional, high-efficiency design and implementation method for split-type storage tanks. Background Technology

[0002] The concept of multi-layer insulation (MLI) was proposed by Peterson in 1951. He argued that after solid-phase and gas-phase heat transfer decreased to a certain extent, radiative heat transfer became the primary mode of heat transfer. Therefore, combining highly reflective thin-film materials with spacer materials of very low thermal conductivity could achieve a good insulation effect. In practical aerospace engineering applications, different combinations of reflective and spacer materials are used to reduce the amount of radiative heat transfer.

[0003] The paper "Mix-Ratio Control Method for Bi-component Falling Pressure Propulsion System," published in the June 2019 issue of *Shanghai Aerospace*, points out that during on-orbit operation, due to the influence of internal and external factors, the cumulative propellant consumption always has a certain deviation. The remaining propellant components will not be able to provide effective impulse, shortening the satellite's lifespan. Therefore, the mixture ratio is a key technical indicator that needs to be focused on in bi-component falling pressure propulsion systems. When the temperature varies within the range of 15–25°C, the fuel tank pressure changes by 5.6%, and the oxygen tank pressure changes by 8.5%. Tank temperature changes have a significant impact on the mixture ratio. Therefore, when using propellants in orbit, the oxygen tank and fuel tank must have good temperature stability, uniformity, and consistency.

[0004] However, propellant tanks generally have a large heat capacity, making it difficult to rapidly raise their temperature using only heaters. Therefore, they are typically encased in multi-layered thermal insulation to reduce heat leakage. Pre-launch temperature control and on-orbit heaters compensate for this leakage to maintain the temperature level of the transfer orbit. If the multi-layered design and implementation are inappropriate, excessive heat leakage from the tank can occur, making it difficult to maintain the tank's temperature using only compensating heaters. This can lead to an inappropriate fuel mixture, making it difficult to achieve the pre-calculated flight attitude, and in severe cases, can cause poor propellant flow or even solidification within the tank, preventing the delivery of propellant to the thruster.

[0005] A review of existing technologies reveals that Ren Yajie's article, "Wrapping Technology of Multilayer Insulation," introduces the design of multilayer materials from several aspects, including wrapping environment requirements, wrapping methods, opening design of reflective surfaces, wrinkling measures for reflective screens, layer design, and compression requirements during wrapping. The article also points out that excessively tight wrapping of multiple layers can lead to heat leakage due to high interlayer pressure. However, the article does not provide specific design and implementation methods. Zhao Yibo et al.'s article, "Research Progress of Multilayer Insulation Structures," reviews the insulation principles, material selection, manufacturing processes, and applications of multilayer insulation. However, the application only shows an overall diagram of a foreign implementation; the article does not provide specific design and implementation methods. Based on the diagram, it can be roughly judged that it involves overall wrapping and multilayer external binding design and implementation methods.

[0006] Ren Yajie studied the normal thermal performance of multilayer insulation in his works "Normal Heat Transfer Analysis of Multilayer Insulation" and "Study on Normal Thermal Performance of Multilayer Insulation". Ye Wenlian et al., in "Heat Transfer Analysis of Variable Density Multilayer Insulation Applied to Cryogenic Tanks", used a layer-by-layer heat transfer model to analyze the heat transfer process in vacuum multilayer insulation structures. Wang Ying et al., in "Study on Heat Transfer Performance of Variable Density Multilayer Insulation Structure for Space Fuel Tanks", used an improved Lockheed model to study the heat transfer performance of variable density multilayer insulation. The above literature provides theoretical analysis and research on the insulation effect of multilayer insulation from two aspects: the individual materials that make up the multilayer and the different composition forms of the multilayer. The research focuses on the heat transfer model of the multilayer itself. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a multi-layered, split-type storage tank structure and its construction method.

[0008] According to the present invention, a split-type multi-layer storage tank structure includes: an upper cap-type multi-layer structure, an upper spherical segment multi-layer structure, a column segment multi-layer structure, a lower spherical segment multi-layer structure, and a lower cap-type multi-layer structure.

[0009] The multi-layer structure is fixed to the encapsulated body using double-sided pressure-sensitive adhesive and Velcro. The multi-layer structure overlaps with each other, and the seams are fixed with metallized plastic film tape.

[0010] Preferably, the interlocking includes interlocking between the upper cap-type multilayer and the upper part of the upper ball segment melon petal multilayer, interlocking between the upper ball segment melon petal multilayers, interlocking between the lower part of the upper ball segment melon petal multilayer and the column segment multilayer, interlocking between the lower ball segment melon petal multilayers, and interlocking between the lower part of the lower ball segment melon petal multilayer and the lower cap-type multilayer.

[0011] Preferably, the upper and lower melon-shaped multilayer sections are respectively adhered to the upper and lower spherical sections of the storage tank using double-sided pressure-sensitive adhesive; the upper melon-shaped multilayer section covers the upper spherical section of the storage tank and extends a predetermined distance into the column section of the storage tank; the lower melon-shaped multilayer section is limited by the obstruction of the lower end face of the storage tank mounting flange and only covers the lower spherical section of the storage tank, and the lower melon-shaped multilayer section is connected to the storage tank body by Velcro at one end near the column section of the storage tank; the column section multilayer section covers the column section of the storage tank; the two sides of the column section multilayer section along the axial direction of the storage tank are interlocked by Velcro, and the upper part of the column section multilayer section and the part of the upper melon-shaped multilayer section extending into the column section of the storage tank are fixed by double-sided pressure-sensitive adhesive; the upper and lower cap-type multilayer sections are inserted from both ends of the storage tank and overlap with the upper and lower spherical section melon-shaped multilayer sections respectively.

[0012] Preferably, the adhesive tape substrate used for multi-layer fixing and overlapping is entirely derived from the constituent materials of the multi-layer itself.

[0013] Preferably, the multilayer structure adopts an alternating structure of double-sided aluminized polyester film and polyester mesh, wherein the double-sided aluminized polyester film is provided with vent holes. The material used for bonding at the overlapping seams of the multilayers is consistent with the multilayer film material; the overlap width between the multilayers is between 20mm and 40mm.

[0014] Preferably, the multilayer membrane is made of 16μm double-sided aluminized polyester film, and the inner surface bottom film of the multilayer membrane is a 25μm polyimide film; the double-sided pressure-sensitive adhesive used to fix the multilayer membrane to the covered storage tank is a double-sided aluminized polyester film coated with acrylic pressure-sensitive adhesive on both sides.

[0015] A method for constructing a multi-layered, split-type storage tank structure according to the present invention includes:

[0016] Step S1: Based on the thermal environment of the storage tank and the temperature to be maintained, determine the materials and structural forms of each multi-layered part, and determine the number of layers of the spherical segment of the storage tank.

[0017] Step S2: Assemble multiple layers on the storage tank with the installed thermal compensation structure;

[0018] Step S3: After the storage tank is installed, cover the storage tank flange when assembling the multiple layers on the upper surface of the storage tank mounting plate, and fix the joint between the multiple layers of the column section with metallized plastic film tape.

[0019] Preferably, in step S1, the material and number of layers of the multilayer structure are obtained through thermal simulation or thermal vacuum test; wherein, a mathematical calculation model for thermal control simulation is established based on the overall configuration layout of the satellite, the satellite flight attitude and the working mode of each unit are set according to the transfer orbit segment, and the power required for tank compensation heating and the corresponding number of layers required for the multilayer are obtained; the multilayer of the tank is modeled using three-dimensional modeling software to obtain the size of a single multilayer, and the number of segments of the tank spherical segment melon layer is determined based on the size of the single multilayer.

[0020] Preferably, in step S2, the upper and lower melon-shaped multilayers are respectively adhered to the upper and lower spherical sections of the storage tank using double-sided pressure-sensitive adhesive; the column sections are covered with multilayer columns; the upper and lower cap-shaped multilayers are inserted from both ends of the storage tank and overlap with the upper and lower spherical melon-shaped multilayers respectively; the outer surface of the seam formed by the overlapping multilayers is fixed with metallized plastic film tape; wherein, the upper melon-shaped multilayer covers the upper spherical section of the storage tank and extends a predetermined distance into the column section; the lower melon-shaped multilayer is limited by the obstruction of the lower end face of the storage tank mounting flange and only covers the lower spherical section of the storage tank, and the lower melon-shaped multilayer is connected to the storage tank body with Velcro at one end near the column section; the column sections are overlapped on both sides along the axial direction of the storage tank with Velcro, and the upper part of the column sections and the part of the upper melon-shaped multilayer extending into the column section are fixed with double-sided pressure-sensitive adhesive.

[0021] Preferably, the outer membrane of each part of the tank located outside the compartment is conductive and each part is grounded in multiple layers; the thermal compensation structure is to use silicone rubber to attach polyimide film-type electric heating elements to the lower ball section of the tank to achieve thermal compensation of the tank when the preset low temperature conditions are met.

[0022] According to the present invention, a storage tank adopts the aforementioned multi-layer structure of a split-type storage tank.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This invention employs a three-dimensional design to "tailor-make" the storage tank, significantly improving the adhesion between the multilayer membrane and the tank. This results in a smooth, glossy, and wrinkle-free multilayer membrane, largely preserving its optical properties and resolving the problem of reduced thermal insulation performance caused by localized compression due to misalignment between the multilayer membrane and the encapsulated material. Furthermore, the improved adhesion reduces the mechanical response of the multilayer membrane during satellite launch, making it less susceptible to damage.

[0025] 2. This invention employs a method of interlocking multiple layers and fixing them with double-sided pressure-sensitive adhesive, Velcro, and single-sided acrylic pressure-sensitive adhesive, making the multiple layers and the storage tank a solid whole. Compared to binding and fixing the multiple layers to the outside of the storage tank, this avoids the problem of reduced heat insulation effect caused by local compression of the multiple layers. At the same time, the interlocking parts are equivalent to increasing the thickness of the multiple layers, resulting in better blocking of radiative heat transfer. Therefore, the multi-layer structure of this invention has better heat insulation effect, is convenient and efficient to implement, and is also suitable for scenarios with high requirements for the heat insulation effect of the storage tank.

[0026] 3. The present invention uses multiple layers of tank mounting plates to cover the tank flange and overlap with the tank in multiple layers, which blocks the radiative heat exchange between the tank and the outside through the flange, thus further enhancing the heat preservation effect of the tank.

[0027] 4. The adhesive tape substrate used in the multi-layer fixing and interlocking of this invention is entirely derived from the constituent materials of the multi-layer itself. The materials are all low thermal conductivity and low outgassing rate, which reduces heat leakage from the tank and also reduces the risk of contamination to the spacecraft caused by the introduction of other materials. Attached Figure Description

[0028] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of a specific embodiment of the present invention;

[0030] Figure 2 This is an embodiment diagram of a specific embodiment of the present invention;

[0031] Figure 3 This is a temperature data graph from a specific embodiment of the present invention, showing the lines corresponding to tank 1 and tank 2 during the test process;

[0032] Figure 4 for Figure 3 The image with the lines corresponding to storage tank 2 hidden in the middle;

[0033] Figure 5 for Figure 3 The image with the lines corresponding to storage tank 1 hidden in the middle;

[0034] Figure 6 for Figure 1 The diagram shows a top view of the structure.

[0035] The diagram shows:

[0036] Detailed Implementation

[0037] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0038] This invention, based on three-dimensional design, forms a split-layer structure, enabling rapid, customized design of multi-layer storage tanks. The operation sequence is clear, easy to implement, and provides excellent bonding, maximizing the preservation of the original optical properties of the multi-layer film. Determining the number of melon-shaped multilayer slices requires ensuring both no warping during the actual multilayer coating process and sufficient overlap between the slices. The curvature of the spherical segments often needs to be adapted to different numbers of slices; when necessary, physical coating tests are conducted using printed multilayer paper templates of the melon slices.

[0039] The split-type multilayer structure includes an upper-cap multilayer structure, an upper spherical segment multilayer structure, a columnar segment multilayer structure, a lower spherical segment multilayer structure, and a lower-cap multilayer structure. During the three-dimensional design and implementation of the split-type multilayer structure, the multilayer structure is fixed to the encapsulated body using double-sided pressure-sensitive adhesive and Velcro. The multilayer structures overlap, and all seams are secured with metallized plastic film tape, increasing the bonding strength between the multilayer structure and the encapsulated body, as well as between different multilayer components, while reducing heat leakage. This invention proposes a highly efficient three-dimensional design and implementation method for split-type multilayer storage tanks, characterized by high design efficiency, high fit, good versatility, ease of implementation, and low heat leakage. Combined with other thermal control methods, it can achieve stable temperature control of the storage tank.

[0040] The present invention will now be described in detail. For example... Figure 1 As shown, this invention discloses a multi-layer, three-dimensional, high-efficiency design and implementation method for a split-type propellant tank. A satellite propellant tank is installed in the middle layer of the cabin, and the required temperature range for the tank during the transfer orbit phase is 5℃~45℃, with an optimal operating temperature of 18℃~22℃. To ensure the tank operates at the optimal temperature, the following steps are performed for the tank's thermal control design and implementation:

[0041] First, the materials and structural forms of each multi-layered component of the propellant tank are determined based on the thermal environment and the required temperature. The materials and number of layers are obtained through thermal simulation. The simulation analysis should consider factors such as the tank's structural layout, the temperature environment, the optimal operating temperature, coating degradation, and flight attitude. The multi-layer materials must be able to withstand the temperature environment and provide good thermal insulation; this can be determined through thermal vacuum testing if necessary. Specifically, a mathematical model for thermal control simulation is established based on the overall satellite configuration. The satellite's flight attitude and the operating modes of each individual unit are set according to the transfer orbit segment, resulting in a required power of 30W for the tank's compensation heating, and a requirement of 10 layers for the multi-layered tank. The heaters are polyimide film-type electric heaters, and the multi-layers utilize a structure of alternating double-sided aluminized polyester film and polyester mesh, as used on satellites. The double-sided aluminized polyester film has vent holes to facilitate the release of gases adsorbed by the multilayer. Vent holes with a diameter of single digits (mm) should be opened on the reflective screens and outer surface films of the multilayer units, and the vent area should not exceed 1.2% of the total area. The multilayer membrane uses a 16μm double-sided aluminized polyester film to reduce heat exchange with the internal environment. The bottom film on the inner surface of the multilayer tank is a 25μm polyimide film to prevent damage to the multilayer from burrs or protrusions, thus reducing the insulation effect. More specifically, the multilayer membrane inside the satellite compartment uses a low-infrared-emissivity double-sided aluminized polyester film to effectively reduce heat exchange between the multilayer tank and the internal environment. Furthermore, the material used for bonding at the overlapping seams of the multilayer should be consistent with the multilayer membrane material. The double-sided pressure-sensitive adhesive used to fix the multilayer to the covered tank is a double-sided aluminized polyester film coated with acrylic pressure-sensitive adhesive on both sides. The multi-layer membrane for the satellite's external storage tank uses either a conductive polyimide aluminized secondary surface mirror or a conductive F46 silver-plated secondary surface mirror, which are both anti-static and have a low solar energy absorption ratio. Furthermore, the material used for bonding the overlapping seams of the multiple layers should be consistent with the multi-layer membrane material. Generally, a conductive polyimide aluminized secondary surface mirror is coated with acrylic pressure-sensitive adhesive on one side, or a conductive F46 silver-plated secondary surface mirror is coated with acrylic pressure-sensitive adhesive on one side. The overlap area between multiple layers is between 20mm and 40mm to ensure the strength of the overlap while minimizing the weight of the multiple layers.

[0042] Secondly, the number of segments in the multi-layered spherical segment of the storage tank is determined. Using 3D modeling software, models of the upper cap-type multi-layered tank, upper spherical segment multi-layered tank, column-type multi-layered tank, lower spherical segment multi-layered tank, and lower cap-type multi-layered tank are created, yielding the relevant dimensions of a single upper spherical segment multi-layered tank, a single lower spherical segment multi-layered tank, a column-type multi-layered tank, an upper cap-type multi-layered tank, and a lower cap-type multi-layered tank. During the design process, overlapping between the multi-layered sections is ensured. The multi-layered tanks, except for the column-type multi-layered tank, are then 3D unfolded and put into production. In this embodiment, the number of spherical segment multi-layered tanks is 9. The storage and operation of the multi-layered tanks should be carried out under specific environmental temperature and humidity conditions and should not be folded to prevent moisture and damage to the multi-layered coatings. More specifically, the multi-layered tanks should be modeled according to their actual thickness, coverage, and overlapping patterns to ensure the accuracy of the dimensions of each multi-layered section. Furthermore, to facilitate production and processing, the upper spherical segment multi-layered tank, lower spherical segment multi-layered tank, upper cap-type multi-layered tank, and lower cap-type multi-layered tank often require 3D unfolding.

[0043] Secondly, silicone rubber is used to attach polyimide film-type electric heating elements to the lower spherical section of the storage tank to achieve thermal compensation for the low-temperature storage tank, and the wiring is completed. The heater is designed with one main and one backup, and thermal compensation for the low-temperature storage tank is achieved through feedback from the thermistors arranged in the lower spherical section of the storage tank and the setting of the temperature control threshold in a self-closed loop.

[0044] Secondly, thermal control is implemented according to the assembly sequence and fixing method of the various parts of the multi-layered structure. Specifically, the upper and lower melon-shaped multi-layers are adhered to the upper and lower spherical sections of the storage tank using double-sided pressure-sensitive adhesive. The outer surface of the seam formed by the overlapping melon-shaped multi-layers is fixed using metallized plastic film tape. The storage tank is then covered with multiple column sections. The upper melon-shaped multi-layer not only needs to cover the upper spherical section but also extend a certain distance into the column section. The lower melon-shaped multi-layer, limited by the obstruction of the lower end face of the storage tank mounting flange, only needs to cover the spherical section. However, the lower melon-shaped multi-layer near the column section needs to be connected to the storage tank body using Velcro to solve the problem of not being able to overlap with the column section multi-layer, increasing the firmness of its connection with the storage tank. The two sides of the column section multi-layer along the storage tank axis are overlapped using Velcro, and the upper part of the column section multi-layer is fixed to the part of the upper melon-shaped multi-layer extending into the column section using double-sided pressure-sensitive adhesive. The seam is fixed using metallized plastic film tape. The upper and lower cap-type multilayer panels are fitted onto both ends of the tank and overlapped with the upper and lower spherical segment multilayer panels. The outer surface of the joint is fixed with metallized plastic film tape. After the tank is installed, the tank flange is covered when assembling the multilayer panels on the upper surface of the tank mounting plate, and the joint between the flange and the column segment multilayer panels is fixed with metallized plastic film tape. In a preferred embodiment, the metallized plastic film tape should be consistent with the multilayer film of the tank, generally a double-sided aluminized polyester film coated with acrylic pressure-sensitive adhesive on one side, a conductive polyimide aluminized secondary surface mirror coated with acrylic pressure-sensitive adhesive on one side, or a conductive F46 silver-plated secondary surface mirror coated with acrylic pressure-sensitive adhesive on one side. The double-sided pressure-sensitive adhesive is generally a polyimide film coated with acrylic pressure-sensitive adhesive on both sides. The dimensions of the multilayer panels on the upper surface of the tank mounting plate should be able to fit the multilayer panels of the tank column segments, ensuring overlap between the multilayer panels and reducing heat leakage through the tank flange. The outer membranes of each part of the storage tank located outside the cabin must be conductive and each part must be grounded to prevent static electricity accumulation and discharge in the space environment.

[0045] Finally, the effectiveness of the multi-layer three-dimensional design and implementation method of the propellant tanks of this invention was verified through a vacuum thermal test. The temperature of the two propellant tanks located at different positions within the satellite module throughout the transfer orbit segment was controlled between 20 and 22°C. Figure 3 As shown, through the tank thermal control design and implementation method of the present invention, the tank temperature can reach the optimal level during the lowest operating conditions of the spacecraft, which is also the stage when the propulsion system needs to work.

[0046] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A multi-layered, split-type storage tank structure, characterized in that, include: Multi-layered structures include: top-hat type, top-spherical segment multi-layered structure, columnar segment multi-layered structure, bottom-spherical segment multi-layered structure, and bottom-hat type multi-layered structure. The multi-layer structure is fixed to the encapsulated body using double-sided pressure-sensitive adhesive and Velcro fasteners. The multi-layer structure overlaps with each other, and the seams are fixed with metallized plastic film tape. The upper and lower melon-shaped multi-layered structures are respectively attached to the upper and lower spherical sections of the storage tank using double-sided pressure-sensitive adhesive. The upper melon-shaped multi-layered structure covers the upper spherical section and extends a predetermined distance into the column section of the storage tank. The lower melon-shaped multi-layered structure, limited by the obstruction of the lower end face of the storage tank mounting flange, only covers the lower spherical section of the storage tank. The lower melon-shaped multi-layered structure is connected to the storage tank body at one end near the column section using Velcro. The column section multi-layered structure covers the column section of the storage tank. The two sides of the column section multi-layered structure along the axial direction of the storage tank are interlocked using Velcro, and the upper part of the column section multi-layered structure and the part of the upper melon-shaped multi-layered structure extending into the column section of the storage tank are fixed with double-sided pressure-sensitive adhesive. The upper and lower cap-type multi-layered structures are inserted from both ends of the storage tank and overlap with the upper and lower spherical section melon-shaped multi-layered structures, respectively.

2. The multi-layer structure of the split-type storage tank according to claim 1, characterized in that, The interlocking includes the interlocking of the upper cap-type multilayer with the upper part of the upper ball segment melon layer, the interlocking between the upper ball segment melon layers, the interlocking of the lower part of the upper ball segment melon layer with the column layer, the interlocking between the lower ball segment melon layers, and the interlocking of the lower part of the lower ball segment melon layer with the lower cap-type multilayer.

3. The multi-layer structure of the split-type storage tank according to claim 1, characterized in that, The adhesive tape substrate used for multi-layer fixing and overlapping is entirely derived from the constituent materials of the multi-layer itself.

4. The multi-layer structure of the split-type storage tank according to claim 1, characterized in that, The multilayer structure uses alternating layers of double-sided aluminized polyester film and polyester mesh. The double-sided aluminized polyester film has vent holes. The material used for bonding the overlapping seams of the multilayers is consistent with the multilayer film material. The overlap width between the multilayers is between 20mm and 40mm. The multilayer film uses 16μm double-sided aluminized polyester film, and the inner surface of the multilayer is a 25μm polyimide film. The double-sided pressure-sensitive adhesive used to fix the multilayers to the covered storage tank is a double-sided aluminized polyester film coated with acrylic pressure-sensitive adhesive on both sides.

5. A method for constructing a multi-layered, split-type storage tank structure according to any one of claims 1 to 4, characterized in that, include: Step S1: Based on the thermal environment of the storage tank and the temperature to be maintained, determine the materials and structural forms of each multi-layered part, and determine the number of layers of the spherical segment of the storage tank. Step S2: Assemble multiple layers on the storage tank with the thermal compensation structure already installed; Step S3: After the storage tank is installed, cover the storage tank flange when assembling the multiple layers on the upper surface of the storage tank mounting plate, and fix the joint between the multiple layers of the column section with metallized plastic film tape.

6. The method for constructing a multi-layered split-type storage tank according to claim 5, characterized in that, In step S1, the material and number of layers of the multilayer structure are obtained through thermal simulation or thermal vacuum test. A mathematical calculation model for thermal control simulation is established based on the overall satellite configuration and layout. The satellite flight attitude and the working mode of each unit are set according to the transfer orbit segment to obtain the power required for tank compensation heating and the corresponding number of layers required for the multilayer structure. The tank multilayer is modeled using 3D modeling software to obtain the size of a single multilayer piece. The number of segments of the tank spherical segment melon-shaped multilayer is determined based on the size of the single multilayer piece.

7. The method for constructing a multi-layered split-type storage tank structure according to claim 5, characterized in that, In step S2, the upper and lower melon-shaped multilayer sections are respectively adhered to the upper and lower spherical sections of the storage tank using double-sided pressure-sensitive adhesive; the column section multilayer section is used to cover the column section of the storage tank; the upper and lower cap-type multilayer sections are inserted from both ends of the storage tank and overlap with the upper and lower spherical section melon-shaped multilayer sections respectively; the outer surface of the joint formed by the overlapping multilayer sections is fixed with metallized plastic film tape; the upper melon-shaped multilayer section covers the upper spherical section of the storage tank and extends a predetermined distance into the column section of the storage tank; the lower melon-shaped multilayer section is limited by the obstruction of the lower end face of the storage tank mounting flange and only covers the lower spherical section of the storage tank, and the lower melon-shaped multilayer section is connected to the storage tank body with nylon fastener at one end near the column section of the storage tank; the two sides of the column section multilayer section are overlapped with nylon fastener along the axial direction of the storage tank, and the upper part of the column section multilayer section and the part of the upper melon-shaped multilayer section extending into the column section of the storage tank are fixed with double-sided pressure-sensitive adhesive.

8. The method for constructing a multi-layered split-type storage tank structure according to claim 7, characterized in that, The tank located outside the compartment has multiple conductive outer membranes for each part and multiple grounding treatments for each part; the thermal compensation structure uses silicone rubber to attach polyimide film-type electric heating elements to the lower spherical section of the tank to achieve thermal compensation of the tank when the preset low temperature conditions are met.

9. A storage tank, characterized in that, The split-type multi-layer storage tank structure is adopted as described in any one of claims 1 to 4.

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