Interlayer supporting structure for high-vacuum heat insulation tank body

Abstract

The utility model discloses an interlayer support structure for a high vacuum insulation tank, the high vacuum insulation tank comprises a shell and an inner container, the shell and the inner container form an interlayer, the axial front end of the interlayer is provided with four sliding ends, and the axial rear end of the interlayer is provided with four fixed ends; the fixed end comprises a shell supporting cover connected with the inner wall of the shell and an inner container supporting cover connected with the outer wall of the inner container, the shell supporting cover and the inner container supporting cover are oppositely arranged, do not make contact with each other and form a first cavity, and a composite supporting piece is arranged in the first cavity. The structure of the fixed end is optimized, a plurality of layers of stacked glass fiber reinforced plastic pieces are adopted to prolong a heat conduction path and increase contact heat resistance, the embedded stainless steel reinforcing pieces are adopted to replace the glass fiber reinforced plastic pieces to bear shear loads, and the bearing capacity of the structure is improved on the premise that the heat insulation performance is not affected; the technical problems that in the prior art, the heat insulation requirement cannot be met at the same time, and the bearing requirement can not be met without additionally arranging an auxiliary device are solved.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum insulated tanks and relates to support structures, specifically a sandwich support structure for high vacuum insulated tanks. Background Technology

[0002] In a double-layered high-vacuum insulated tank, the interlayer support, as a structural component connecting the inner container and the outer shell, must first fulfill its connection function, i.e., restrict all degrees of freedom of the inner container relative to the outer shell, and be able to withstand the loads under all possible operating conditions of the tank truck and the worst possible combinations. Secondly, it must ensure insulation requirements. While bearing load, the support inevitably becomes a thermal bridge, requiring the extension of the path or the selection of low thermal conductivity materials to increase thermal resistance. However, extending the path will reduce structural stiffness, and low thermal conductivity materials are mostly non-metallic materials with strength far lower than steel; both methods weaken the load-bearing capacity. Thirdly, the inner container will experience significant temperature deformation after being filled with a cryogenic medium. The support structure must have sufficient adaptability to avoid excessive temperature stress or component shrinkage and detachment leading to load transfer failure.

[0003] According to Chinese patent CN201310503618.5, the existing high-vacuum insulated tank sandwich support technology is relatively mature. For media in the liquid nitrogen temperature range, the traditional "eight-point support" structure of the sandwich support can well meet the functional requirements of both insulation and load-bearing. In this structure, four sliding ends press the fiberglass tube onto the inner container support seat through the outer shell support cover, positioning the lateral and vertical directions of the inner container. The fiberglass tube bears the compressive load parallel to the fabric direction. In addition to positioning the lateral and vertical directions, the four fixed ends also restrict the longitudinal displacement and circumferential rotation of the inner container by simultaneously inserting the fiberglass tube into the outer shell support cover and the inner container support cover. The fiberglass tube also bears additional compressive and shear loads perpendicular to the fabric direction.

[0004] When the container is mobile and has a large load, the vertical and longitudinal inertial forces have a significant impact on the load conditions of the sandwich support. Relying solely on the four fixed-end FRP tubes for load-bearing capacity will lead to crushing due to insufficient insertion contact area and material compressive strength, or shearing due to insufficient material shear strength, thus failing to properly transfer the load. If the FRP tubes are thickened or thickened to meet strength requirements, even if the length of the FRP tubes is increased within the structural limits to extend the heat conduction path, the insulation performance requirements cannot be met simultaneously.

[0005] Alternatively, all eight supports could be replaced with sliding ends, and a tie rod or stop device could be added between the inner container and the outer shell to limit the longitudinal displacement of the inner container. To avoid excessively increasing thermal bridges, the added supports must also find ways to extend the heat conduction path and solve the problems of compensating for assembly errors, the strength problems caused by the significant increase in weight, and a series of manufacturing problems resulting from the increased structural complexity. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a sandwich support structure for high vacuum insulated tanks, so as to solve the technical problem that the existing technology cannot simultaneously meet the insulation requirements and the load-bearing requirements without adding additional auxiliary devices.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A sandwich support structure for a high vacuum insulated tank, the high vacuum insulated tank including an outer shell and an inner container, the outer shell and the inner container forming a sandwich, the axial front end of the sandwich being provided with four sliding ends, and the axial rear end of the sandwich being provided with four fixed ends.

[0009] The fixed end includes an outer shell support cover connected to the inner wall of the outer shell and an inner container support cover connected to the outer wall of the inner container. The outer shell support cover and the inner container support cover are arranged opposite to each other, do not contact each other, and form a first cavity. A composite support member is provided in the first cavity. The composite support member includes, from bottom to top, a first fiberglass pad, a first tubular fiberglass collar, multiple plate-shaped fiberglass collars, a second tubular fiberglass collar, and a second fiberglass pad. The first fiberglass pad, the first tubular fiberglass collar, the multiple plate-shaped fiberglass collars, the second tubular fiberglass collar, and the second fiberglass pad form a second cavity. A stainless steel reinforcing member is provided in the second cavity.

[0010] This utility model also includes the following technical features:

[0011] The outer wall of the outer shell support cover is provided with two pairs of symmetrically distributed ribs.

[0012] The stainless steel reinforcing member and the second cavity are in a transition fit.

[0013] Both the outer shell support cover and the inner container support cover are elongated cylindrical bodies with one end face open, and their interiors are cavities.

[0014] The outer edges of the first fiberglass pad, the first tubular fiberglass collar, and the plate fiberglass collar are the same. The first fiberglass pad and the second fiberglass pad have the same structure, and the first tubular fiberglass collar and the second tubular fiberglass collar have the same structure.

[0015] The stainless steel reinforcing member is an elongated cylindrical body with multiple through holes distributed along the axial direction.

[0016] The first tubular fiberglass collar and the second tubular fiberglass collar are laid in the circumferential direction, while the first fiberglass pad, the plate-shaped fiberglass collar, and the second fiberglass pad are laid in the axial direction.

[0017] The plate-shaped fiberglass collar is provided with 3 to 4 pieces.

[0018] Compared with the prior art, the beneficial technical effects of this utility model are:

[0019] (I) The structure of the fixed end is optimized in this utility model. Multi-layer stacked fiberglass parts are used to extend the heat conduction path and increase the contact thermal resistance. Embedded stainless steel reinforcing parts are used to replace fiberglass parts to bear shear loads. The load-bearing capacity of the structure is improved without affecting the thermal insulation performance. This solves the technical problem in the prior art that the thermal insulation requirements cannot be met at the same time and the load-bearing requirements can be met without adding additional auxiliary devices.

[0020] (II) The way in which the structure of this utility model restricts the degree of freedom of the inner container relative to the outer shell is consistent with the traditional "eight-point support" form, which is mature and reliable, does not require additional auxiliary devices, and avoids the problem of structural complexity.

[0021] (III) This utility model does not significantly increase weight, cost and process complexity, which is conducive to its widespread application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation of this utility model on a high vacuum insulation tank.

[0023] Figure 2 This is a schematic diagram of the fixed end in this utility model;

[0024] Figure 3 This is an exploded view of the fixed end in this utility model;

[0025] Figure 4 This is a longitudinal sectional view of the fixed end in this utility model;

[0026] Figure 5 This is a cross-sectional view of the fixed end in this utility model;

[0027] Figure 6 This is a schematic diagram showing the layering direction of the tubular fiberglass collar in this utility model;

[0028] Figure 7 This is a schematic diagram showing the fabric layer direction of the fiberglass pad in this utility model;

[0029] Figure 8 This is a schematic diagram of the layering direction of the plate-shaped fiberglass collar in this utility model.

[0030] The labels in the diagram represent: 1. Sliding end; 2. Fixed end; 3. Outer shell; 4. Inner container.

[0031] The outer shell support cover 201, the inner container support cover 202, the first fiberglass pad 203, the first tubular fiberglass collar 204, the plate-shaped fiberglass collar 205, the second tubular fiberglass collar 206, the second fiberglass pad 207, the stainless steel reinforcing member 208, the rib plate 209, and the through hole 2010.

[0032] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, all components in this utility model are components known in the art.

[0034] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0035] This utility model provides a sandwich support structure for high vacuum insulated tanks, such as... Figures 1-3 The high vacuum insulated tank includes an outer shell 3 and an inner container 4, which form a sandwich. The front end of the sandwich is provided with four sliding ends 1, and the rear end of the sandwich is provided with four fixed ends 2.

[0036] The fixed end 2 includes an outer shell support cover 201 connected to the inner wall of the outer shell and an inner container support cover 202 connected to the outer wall of the inner container. The outer shell support cover 201 and the inner container support cover 202 are arranged opposite to each other, do not contact each other, and form a first cavity. A composite support component is provided in the first cavity. The composite support component includes, from bottom to top, a first fiberglass pad 203, a first tubular fiberglass collar 204, multiple plate-shaped fiberglass collars 205, a second tubular fiberglass collar 206, and a second fiberglass pad 207. The first fiberglass pad 203, the first tubular fiberglass collar 204, the multiple plate-shaped fiberglass collars 205, the second tubular fiberglass collar 206, and the second fiberglass pad 207 form a second cavity. A stainless steel reinforcing member 208 is provided in the second cavity.

[0037] In the above technical solution, the structure of the fixed end 1 is optimized by using multi-layered stacked fiberglass parts to extend the heat conduction path and increase the contact thermal resistance. Embedded stainless steel reinforcing parts are used to replace fiberglass parts to bear shear loads. The load-bearing capacity of the structure is improved without affecting the thermal insulation performance. This solves the technical problem in the prior art that it is impossible to simultaneously meet the thermal insulation requirements and meet the load-bearing requirements without adding additional auxiliary devices.

[0038] In the above technical solution, both the sliding end 1 and the fixed end 2 are set between the outer shell 3 and the inner container 4 of the high vacuum insulated tank. The structure of the sliding end 1 in this solution is an existing structure, namely the sliding support assembly in Chinese patent CN201310503618.5 (inner and outer tank support structure), which includes an outer tank support cover fixedly set on the outer shell 3 and an inner tank sliding support plate set on the inner container 4, as well as a fiberglass support fixedly set inside the outer tank support cover.

[0039] Both the sliding end 1 and the fixed end 2 are used to limit the lateral and vertical displacement of the inner container 4 relative to the outer shell 3. The function of the sliding end 1 is to fix the front end of the inner container 4, while the improved fixed end 2 is responsible for fixing the rear end of the inner container. The fixed end 2 is assembled with the composite support in the inner container support cover 202 and cannot be longitudinally displaced. However, the fiberglass support contacts the inner tank sliding support plate on the inner container but is not jammed or fixed, and can slide longitudinally when the inner container 4 and the outer shell 3 expand and contract at different times.

[0040] See Figures 4-5 When subjected to vertical loads, the load transfer path is: inner container support cover 202 → composite support component → outer shell support cover 201. Inside the composite support component, there are two parallel load transfer paths:

[0041] Path 1 is: First fiberglass pad 203 → First tubular fiberglass collar 204 → Plate fiberglass collar 205 → Second tubular fiberglass collar 206 → Second fiberglass pad 207;

[0042] Path 2 is: First fiberglass pad 203 → Stainless steel reinforcement 208 → Second fiberglass pad 207.

[0043] The load-bearing area (i.e., the area of ​​the oblong shape) of this composite support is more than twice the size of the circular area of ​​the traditional structure, and the loading direction of most fiberglass parts is perpendicular to the direction of the fabric layers, resulting in higher compressive strength.

[0044] When subjected to longitudinal and tangential loads, the load transfer path is as follows: outer shell support cover 201 → first tubular fiberglass collar 204 → stainless steel reinforcement 208 → second tubular fiberglass collar 206 → inner container support cover 202.

[0045] In this transmission path, the first tubular fiberglass collar 204 and the second tubular fiberglass collar 206 are only subjected to compression and not shear; the shearing force is borne by the stainless steel reinforcement 208. To further improve the stress condition of the fiberglass collars, the depth of the support cover is increased, thereby increasing the insertion depth of the fiberglass collars.

[0046] Because the longitudinal load is greater than the tangential load, the composite support with an elongated oval cross-section is positioned with its straight edges perpendicular to the longitudinal load direction. When subjected to longitudinal loads, the bearing area (i.e., the product of the projected length of the elongated oval and the insertion depth) is significantly increased compared to traditional structures. Furthermore, the loading direction of the fiberglass collar (the direction of the force acting on this part) is perpendicular to the layer direction, preventing the fiberglass component from being crushed. The fiberglass collar and stainless steel reinforcement in the composite support employ a transition fit, and the gap between the fiberglass collar and the support cover is strictly controlled to prevent impact during load transfer.

[0047] The fixed end serves as a thermal bridge between the inner container and the outer shell. The heat transfer path is as follows: outer shell support cover 201 → first fiberglass pad 203 and first tubular fiberglass collar 204 → stainless steel reinforcing member 208 and plate fiberglass collar 205 → second tubular fiberglass collar 206 and second fiberglass pad 207 → inner container support cover 202.

[0048] Due to the increased stress-bearing area, the average thermally conductive cross-sectional area in this path is increased compared to the traditional form. However, the increased depth of the support cover also lengthens the path. Furthermore, by utilizing the characteristic that the thermal conductivity of epoxy fiberglass pipes and plates is lower in the direction perpendicular to the fabric layers, the fiberglass components are rationally arranged. Calculations and verification results show that the heat transfer of the support in this invention is basically the same as that of the traditional form. Moreover, in the traditional form, the fiberglass support is a single unit, while this invention uses a composite support. There is a certain contact thermal resistance between fiberglass components and between fiberglass components and stainless steel reinforcements. Since the resistance value cannot be quantified, it was not included in the calculations. Therefore, in practical applications, the thermal insulation performance of the fixed-end support in this invention meets the requirements.

[0049] When a high-vacuum insulation tank is installed on a vehicle, the longitudinal direction refers to the direction of the vehicle's travel, that is, parallel to the tank's axis; the vertical direction is vertically upward or downward; and the transverse direction is perpendicular to both the vertical and longitudinal directions, such as the direction of the vehicle's swaying from side to side as it moves forward.

[0050] In this technical solution, depending on the different media's requirements for the container's load-bearing and insulation, when the load-bearing requirement is reduced while the insulation requirement is increased, the stainless steel reinforcing member 208 in the composite support can be replaced with a non-metallic material that has lower strength but higher thermal resistance.

[0051] In this technical solution, when the vertical load can be borne by the stacked fiberglass rings alone, the height of the stainless steel reinforcing member 208 in the composite support can be changed to be slightly lower than the height of the stacked rings. This ensures shear resistance but prevents it from contacting the first fiberglass pad 203 and the second fiberglass pad 207 at both ends. This can cut off part of the heat transfer path and further improve the thermal insulation performance.

[0052] Two pairs of symmetrically distributed ribs 209 are provided on the outer side wall of the outer shell support cover 201.

[0053] In the above technical solution, the outer shell support cover 201 protrudes from the outer shell 3 to a certain height, which disrupts the integrity of the shape of the outer shell 3. The rib plate 209 can alleviate the stress concentration at the abrupt change in structure.

[0054] The stainless steel reinforcing member 208 has a transition fit with the second cavity.

[0055] In the above technical solution, the transition fit can effectively eliminate the gap between the stainless steel reinforcing member 208 and the first tubular fiberglass collar 204, multiple plate-shaped fiberglass collars 205 and the second tubular fiberglass collar 206, thus avoiding impact.

[0056] Both the outer shell support cover 201 and the inner container support cover 202 are elongated cylindrical bodies with one end face open, and their interiors are cavities.

[0057] In the above technical solution, this arrangement increases the stress-bearing area of ​​the composite support to reduce pressure. The original support has a circular cross-section; increasing its diameter would also increase the stress-bearing area. However, on the one hand, the longitudinal force is much greater than the transverse force; on the other hand, the fixed spacing of the reinforcing rings in the outer shell 3 limits the extent to which the diameter of the composite support can be increased. Therefore, a support with elongated cylindrical bodies of different widths in the longitudinal and transverse directions is used, with the width direction perpendicular to the direction of the longitudinal force.

[0058] Preferably, elliptical or rounded rectangle shapes can also be used to achieve the same effect.

[0059] The outer edges of the first fiberglass pad 203, the first tubular fiberglass collar 204, and the plate fiberglass collar 205 are the same. The first fiberglass pad 203 and the second fiberglass pad 207 have the same structure. The first tubular fiberglass collar 204 and the second tubular fiberglass collar 206 have the same structure.

[0060] In the above technical solution, this arrangement can constrain the vertical and lateral displacement of the inner container 4 relative to the outer shell 3. These displacements are caused by gravity and inertial forces, respectively. Gravity and inertial forces are vector-decomposed into forces perpendicular to the cross-section of the composite support and balanced by the supporting reaction force provided by the composite support. The composite support's strength must meet the support requirements to curb the aforementioned displacement trends. In this technical solution, when the composite support performs the above functions, the multi-layered fiberglass components are only subjected to pressure perpendicular to the plate surface, and the plate area meets the strength requirements. Simultaneously, the total height of the multi-layered fiberglass components is also the length of the heat transfer path, and the plate surface area of ​​the fiberglass components is also the cross-sectional area of ​​the heat transfer path. From an insulation perspective, a longer path length and a smaller cross-sectional area are better.

[0061] The stainless steel reinforcing member 208 is an elongated cylindrical body with multiple through holes 2010 distributed along the axial direction.

[0062] In the above technical solution, through holes 2010 are opened on the stainless steel reinforcing member 208 to reduce the heat transfer area. One to three through circular holes are opened, and the circular holes are centered or evenly distributed to avoid the tube wall being too thin in a certain place. The remaining cross-sectional area should first meet the shear resistance requirements of the stainless steel reinforcing member, and secondly, it should be reduced as much as possible to weaken the conduction heat flow.

[0063] The cross-sectional shape of the stainless steel reinforcing member 208 can be changed to a rounded rectangle or an ellipse, and the one or more larger round holes can be changed to smaller round holes or irregular holes arranged in a grid or mesh.

[0064] The first tubular fiberglass collar 204 and the second tubular fiberglass collar 206 are laid in the circumferential direction, while the first fiberglass pad 203, the plate-shaped fiberglass collar 205, and the second fiberglass pad 207 are laid in the axial direction.

[0065] In the above technical solutions, fiberglass possesses both good strength and a low thermal conductivity, making it a superior material for thermal insulation support. Fiberglass is an anisotropic material (see Table 1). The different layering directions of fiberglass components utilize the material's properties to make the structure more adaptable to corresponding load-bearing conditions. The mechanical properties of a fiberglass component differ depending on the loading direction (the direction of the force acting on the component). When the loading direction is perpendicular to the layering direction, the compressive strength is higher and the thermal conductivity is lower; conversely, when the loading direction is parallel to the layering direction, the opposite is true. The first tubular fiberglass collar 204 and the second tubular fiberglass collar 206, in addition to transmitting pressure in the plate direction, also need to transmit the larger pressure generated by the longitudinal inertial force acting circumferentially on the collar; therefore, their layering direction is circumferential. The remaining fiberglass components only transmit pressure in the plate direction and occupy the majority of the heat transfer path; therefore, their layering direction is axial.

[0066] Table 1 Physical and Mechanical Properties of Epoxy Fiberglass Pipes for Low-Temperature Insulation

[0067]

[0068] The plate-type fiberglass collar 205 has 3 to 4 collars.

[0069] In the above technical solution, the number of plate-type fiberglass collars 205 is specifically set according to the heat insulation requirements.

Claims

1. A sandwich support structure for a high-vacuum insulated tank, the high-vacuum insulated tank comprising an outer shell (3) and an inner container (4), the outer shell (3) and the inner container (4) forming a sandwich, characterized in that, The interlayer has four sliding ends (1) at its axial front end and four fixed ends (2) at its axial rear end. The fixed end (2) includes an outer shell support cover (201) connected to the inner wall of the outer shell and an inner container support cover (202) connected to the outer wall of the inner container. The outer shell support cover (201) and the inner container support cover (202) are arranged opposite to each other, do not contact each other, and form a first cavity. A composite support member is provided in the first cavity. The composite support member includes a first fiberglass pad (203), a first tubular fiberglass collar (204), a plurality of plate-shaped fiberglass collars (205), a second tubular fiberglass collar (206), and a second fiberglass pad (207) arranged sequentially from bottom to top. The first fiberglass pad (203), the first tubular fiberglass collar (204), the plurality of plate-shaped fiberglass collars (205), the second tubular fiberglass collar (206), and the second fiberglass pad (207) form a second cavity. A stainless steel reinforcing member (208) is provided in the second cavity.

2. The sandwich support structure for high-vacuum insulated tanks as described in claim 1, characterized in that, Two pairs of symmetrically distributed ribs (209) are provided on the outer side wall of the outer shell support cover (201).

3. The sandwich support structure for high-vacuum insulated tanks as described in claim 1, characterized in that, The stainless steel reinforcing member (208) and the second cavity are in a transition fit.

4. The sandwich support structure for high-vacuum insulated tanks as described in claim 1, characterized in that, Both the outer shell support cover (201) and the inner container support cover (202) are elongated cylindrical bodies with an open end face and a hollow interior.

5. The sandwich support structure for high-vacuum insulated tanks as described in claim 1, characterized in that, The outer edges of the first fiberglass pad (203), the first tubular fiberglass collar (204), and the plate fiberglass collar (205) are the same. The first fiberglass pad (203) and the second fiberglass pad (207) have the same structure. The first tubular fiberglass collar (204) and the second tubular fiberglass collar (206) have the same structure.

6. The sandwich support structure for high-vacuum insulated tanks as described in claim 1, characterized in that, The stainless steel reinforcing member (208) is an elongated cylindrical body with multiple through holes (2010) distributed along the axial direction.

7. The sandwich support structure for high-vacuum insulated tanks as described in claim 1, characterized in that, The first tubular fiberglass collar (204) and the second tubular fiberglass collar (206) are laid in the circumferential direction, while the first fiberglass pad (203), the plate-shaped fiberglass collar (205), and the second fiberglass pad (207) are laid in the axial direction.

8. The sandwich support structure for high-vacuum insulated tanks as described in claim 1, characterized in that, The plate-shaped fiberglass collar (205) is provided with 3 to 4 pieces.

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