Single layer co-base and co-base tank

Abstract

The utility model discloses an embodiment provides a kind of single-layer common bottom and common bottom storage tank, single-layer common bottom includes: common bottom plate, first heat insulation layer and cylindrical lower tank barrel section;The common bottom plate sleeve is connected in the upper end of the lower tank barrel section;The first heat insulation layer covers the lower side of the common bottom plate, and along the included angle of the lower side of the common bottom plate and the upper end of the inside surface of the lower tank barrel section, continuously transition covers the upper portion of the inside surface of the lower tank barrel section;Common bottom storage tank is manufactured by using single-layer common bottom instead of double-layer common bottom, reduces the complexity of bottom structure assembly and manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of aerospace technology, and in particular to a single-layer common-bottom and common-bottom storage tank. Background Technology

[0002] Most mainstream launch vehicles use cryogenic propellants such as liquid oxygen / kerosene, liquid oxygen / methane, and liquid hydrogen / liquid oxygen. When a launch vehicle uses a single-layer common-bottom structure, the temperature difference between the propellants on both sides of the common bottom exceeds 200°C. To meet the propellant temperature requirements for engine start-up and operation, traditional common-bottom tanks are all double-layer common-bottom structures. Their insulation structure is a PMI (polymethacrylimide) foam sandwich / vacuum honeycomb structure located in the middle of the double-layer common bottom. The double-layer common bottom requires the curved surfaces of the bottom of the upper tank and the top of the lower tank to fit together, and also to fit the upper and lower surfaces of the PMI foam used as the insulation layer. The manufacturing process and installation are complex, resulting in a complex assembly process and high manufacturing costs for the aforementioned double-layer common-bottom structure.

[0003] In the process of realizing this utility model, the applicant discovered that the prior art has at least the following problems: the existing single-layer common bottom heat insulation coverage area is small and the heat insulation effect is poor. Utility Model Content

[0004] This utility model provides a single-layer common-bottom and common-bottom storage tank with large temperature difference to solve the problem of small insulation coverage area and poor insulation effect of existing single-layer common-bottom tanks.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a single-layer common bottom, comprising: a common bottom plate (1), a first heat insulation layer (2), and a cylindrical lower box section (3). The common bottom plate (1) is sleeved on the upper end of the lower box section (3); The first insulation layer (2) covers the lower side of the common bottom plate (1) and, along the angle (31) between the lower side of the common bottom plate (1) and the upper end of the inner side of the lower box section (3), continuously transitions to cover the upper part of the inner side of the lower box section (3).

[0006] Furthermore, it also includes: anti-fall-off netting; The anti-fall-off net is installed below the first insulation layer.

[0007] Furthermore, a plurality of fixed supports protruding from the outside of the first insulation layer are provided on the lower side of the common bottom plate; The anti-falling net is connected to the fixed support.

[0008] Furthermore, a plurality of ear pieces are uniformly arranged along the circumferential direction of the inner side surface of the lower box section and below the first insulation layer. The outer edge of the anti-fall-off net is connected to the ear piece.

[0009] Furthermore, the fixed support includes a boss base, an upper support, and a heat insulation sheet; The boss base is connected to the lower side of the common base plate; The upper support is connected to the boss base, and the heat insulation sheet is provided between the upper support and the boss base.

[0010] Furthermore, the anti-fall-off net is ring-shaped; An outlet flange is provided at the center of the common bottom plate; The inner ring of the anti-fall-off net is fitted onto the outside of the outlet flange.

[0011] Furthermore, the anti-fall-off net is composed of multiple ring-shaped fan-shaped nets spliced ​​together to form a ring; A portion of the plurality of fixed supports are evenly arranged along the circumference of the inner ring of the multiple ring fan meshes spliced ​​together at a first fixed interval; The remaining portions of the plurality of fixed supports are evenly arranged along the straight lines corresponding to each seam of the plurality of ring fan meshes at a second fixed interval.

[0012] Furthermore, the first insulation layer includes: an insulation material layer disposed on the lower side of the common base plate, a fiberglass cloth layer disposed on the lower side of the insulation material layer, and a polyurea layer sprayed on the lower side of the fiberglass cloth layer.

[0013] Furthermore, the thickness of the first insulation layer is not less than 20 millimeters.

[0014] Furthermore, the width of the upper part of the inner side of the lower box section that continuously transitions downward from the vertex of the included angle to cover it is greater than or equal to 405 mm.

[0015] Furthermore, the first insulation layer is made of low-density polyurethane foam.

[0016] Secondly, this utility model embodiment provides a common-bottom storage tank, including: a single-layer common bottom as described above, a lower tank bottom, and a cylindrical upper tank. The bottom of the lower tank is connected to the lower end of the lower tank section; The lower edge of the upper box is connected to the upper edge of the common bottom plate; The outer side of the upper tank is provided with a second heat insulation layer.

[0017] Furthermore, the lower portion of the second insulation layer extends along the outer side of the common-bottom tank to cover the area below the included angle. Furthermore, the thickness of the second insulation layer is greater than or equal to 15 mm.

[0018] Furthermore, the second insulation layer is made of low-density polyurethane foam.

[0019] The above technical solution has the following beneficial effects: the first insulation layer covers the lower side of the common bottom plate and extends downward along the surface of the common bottom plate and the lower tank section through the angle between the two to the upper part of the lower tank section. Compared with the traditional technology where the insulation material can only be arranged in the interlayer between the bottom of the upper and lower tanks, the first insulation layer of this utility model provides a larger insulation coverage area and can provide a better insulation effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a single-layer, common-base layer structure according to one embodiment of the present utility model; Figure 2 This is a schematic diagram of the mesh structure of a single-layer common-bottom anti-fall-off net, one of the embodiments of this utility model; Figure 3 This is a three-dimensional perspective view from a bottom angle of one embodiment of the present utility model, showing a single-layer, common-bottom structure with a lower box section. Figure 4 This is a schematic diagram of the structure of a fixed support in one embodiment of the present utility model; Figure 5 This is a partially cutaway structural diagram of a common-bottom storage tank, one of the embodiments of this utility model.

[0022] The reference numerals in the attached diagram are as follows: 1. Common base plate; 2. First insulation layer; 21. Insulation material layer; 22. Fiberglass cloth layer; 23. Polyurea layer; 3. Lower tank section; 31. Angle; 4. Anti-fall net; 5. Fixed support; 6. Ear plate; 51. Boss base; 52. Upper support; 53. Insulation sheet; 7. Outflow flange; 32. Bottom of lower tank; 8. Upper tank; 9. Second insulation layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To meet the propellant temperature requirements for engine start-up and operation, the single-layer common bottom needs to be reliably insulated. At the same time, the single-layer common bottom insulation structure needs to be designed to prevent it from falling off and sticking, so as to avoid the common bottom insulation layer falling into the fuel tank when it is cooled during refueling and during the flight of the rocket, introducing foreign matter and causing launch failure.

[0025] This utility model provides a thermal insulation structure for a single-layer common-bottom storage tank with a large temperature difference, which breaks through the thermal insulation technology of single-layer common-bottom with a large temperature difference of over 200℃, the technology to prevent the common-bottom insulation layer from falling off, and the technology to resist the pressure and bearing capacity of the common-bottom insulation layer.

[0026] Firstly, such as Figure 1 As shown, this utility model embodiment provides a single-layer common bottom, including: a common bottom plate 1, a first heat insulation layer 2, and a cylindrical lower box section 3; The common bottom plate 1 is sleeved on the upper end of the lower box section 3; The first insulation layer 2 covers the lower side of the common bottom plate 1, and continuously transitions to cover the upper part of the inner side of the lower box barrel section 3 along the angle 31 between the lower side of the common bottom plate 1 and the upper end of the inner side of the lower box barrel section 3.

[0027] In some embodiments, to improve the thermal insulation of the single-layer common bottom, the lower tank section 3 is also included as part of the single-layer common bottom. Before laying the first insulation layer, the upper end of the lower tank section 3 is first fitted onto the outer surface of the common bottom plate 1 from below, which can be connected by welding. Then the first insulation layer is laid. The first insulation layer continuously transitions downwards along the angle 31 formed at the junction of the outer surface of the upper part of the common bottom plate 1 and the inner surface of the lower tank section 3, covering the upper part of the inner wall of the lower tank section 3. The first insulation layer covers the entire lower surface of the common bottom plate 1 and a certain width of the upper part of the lower tank section 3, thereby better isolating the temperature of the liquid inside the upper tank section and the lower tank section 3. The shape of the common bottom plate 1 includes a hemispherical or semi-ellipsoidal shape.

[0028] The present invention has the following technical effects: the first insulation layer covers the lower side of the common bottom plate and extends downward along the surface of the common bottom plate and the lower tank section through the angle between the two to the upper part of the lower tank section. Compared with the traditional technology where the insulation material can only be arranged in the interlayer between the bottom of the upper and lower tanks, the first insulation layer of the present invention provides a larger insulation coverage area and can provide a better insulation effect.

[0029] By manufacturing the single-layer common bottom as an independent component, when assembling it into a common bottom tank, it is only necessary to install the upper tank section and the lower tank section on the upper and lower parts of the single-layer common bottom, respectively. This eliminates the problem of precise matching of the curved surface dimensions between the upper and lower tanks and the middle insulation layer in the existing technology, simplifying the production process and making on-site installation simple.

[0030] Furthermore, single-layer common-base also includes: such as Figure 2 The anti-fall-off net 4 shown; The anti-fall-off net 4 is positioned below the first insulation layer 2.

[0031] In some embodiments, an anti-fall-off net 4 is provided below the first insulation layer 2 to further prevent the first insulation layer material from falling into the solution in the lower tank section. Preferably, the anti-fall-off net 4 is a flexible stainless steel mesh. The metal mesh structure in this embodiment of the invention is highly flexible and lightweight. Non-metallic structures have the following problems: the protective net needs to be compatible with the propellant and able to adapt to high and low temperature environments; non-metallic structures are prone to brittle fracture at low temperatures, introducing excess material; metal porous structures have more metal areas and are heavier. Therefore, both non-metallic structures and metal porous structures have their own problems and cannot be used as anti-fall-off nets.

[0032] Furthermore, such as Figure 3 As shown, a plurality of fixed supports 5 protruding from the outside of the first insulation layer 2 are provided on the lower side of the common base plate 1. The anti-falling net 4 is connected to the fixed support 5.

[0033] In some embodiments, the top end of the fixing support 5 is provided with a first through hole; the anti-fall net 4 is connected to the first through hole with a stainless steel fuse. The anti-fall net 4 is fixed by multiple fixing supports 5 to prevent the anti-fall net 4 from falling off accidentally, and at the same time to increase the load-bearing capacity of the anti-fall net 4.

[0034] Furthermore, such as Figure 3 As shown, a plurality of ear pieces 6 are evenly arranged along the circumference of the inner side surface of the lower box section 3 and below the first insulation layer 2. The outer edge of the anti-fall-off net 4 is connected to the ear piece 6.

[0035] In some embodiments, the ear pieces are provided with a second through hole; the anti-falling net 4 is fixed to the second through hole with a stainless steel fuse. The edges of the anti-falling net 4 are fixed by multiple ear pieces 6 to prevent the anti-falling net 4 from accidentally falling off itself. At the same time, it can also increase the load-bearing capacity of the anti-falling net 4, and also seal the edges of the anti-falling net 4 to prevent the material of the first insulation layer 2 from falling from the edges of the anti-falling net 4 into the liquid in the lower tank section 3.

[0036] Furthermore, such as Figure 4 As shown, the fixed support 5 includes a boss base 51, an upper support 52, and a heat insulation sheet 53; The boss base 51 is connected to the lower side of the common base plate 1; The upper support 52 is connected to the boss base 51, and the heat insulation sheet 53 is provided between the upper support 52 and the boss base 51.

[0037] Preferably, the heat insulation sheet 53 is made of fiberglass.

[0038] In some embodiments, the boss base 51 of the fixed support 5 is welded to the lower side of the common base plate 1 or threaded to the lower side of the common base plate 1 by screws and blind threaded holes pre-set on the lower side of the common base plate 1. The upper support 52 is connected to the boss base 51. To minimize heat transfer, a heat insulation sheet 53 is provided between the upper support 52 and the boss base 51 to reduce heat transfer between them to a minimum. A first through hole is provided at the end of the upper support opposite to the boss base. The first through hole is used to connect the anti-falling net 4.

[0039] In some embodiments, such as Figure 4 As shown, the bottom surface of the boss base 51 is connected to the lower side of the common base plate 1. The top surface of the boss base 51 is concave, and the bottom surface of the upper support 52 is concave. The concave bottom surface of the upper support 52 aligns with the concave top surface of the boss base 51, forming a first through hole between the boss base 51 and the upper support 52. The alignment of the concave bottom surface of the upper support 52 with the concave top surface of the boss base 51 reduces the contact area between the upper support 52 and the boss base 51, thus lowering the temperature transfer rate. The heat insulation sheet 53 is disposed between the boss base 51 and the upper support 52. First blind threaded holes are respectively provided at both ends of the top surface of the boss base 51. The heat insulation sheet 53 is provided with a first positioning hole corresponding to the first blind threaded hole, and the upper support 52 is provided with a first fixing hole corresponding to the first blind threaded hole. A first bolt passes through the first fixing hole, the first positioning hole, and is threadedly connected to the first blind threaded hole. The first bolt is made of heat-insulating material.

[0040] In other embodiments, the boss base has a second blind threaded hole at its center; the upper support has a screw portion on the side facing the boss base; the heat insulation sheet has the same external dimensions as the top surface of the boss base, and has a central hole concentric with the second blind threaded hole at its center; the screw portion of the upper support passes through the central hole of the heat insulation sheet and is threadedly connected to the second blind threaded hole.

[0041] In other embodiments, the fixed support further includes heat-insulating fixing screws; the boss base has a second blind threaded hole at its center; the upper support has a positioning hole concentric with the second blind threaded hole; the heat insulation sheet has the same top surface dimensions as the boss base, and has a center hole concentric with the second blind threaded hole; the heat-insulating fixing screws pass through the positioning hole, and the center hole mates with the second blind threaded hole. The heat-insulating fixing screws and the heat insulation sheet fix and isolate the fixed support and the upper support, thus providing heat insulation.

[0042] Furthermore, the anti-fall-off net 4 is ring-shaped; as... Figure 1 As shown, an outlet flange 7 is provided at the bottom center of the common base plate 1; the inner ring of the anti-falling net 4 is sleeved on the outside of the outlet flange 7.

[0043] Furthermore, the anti-fall-off net 4 is composed of multiple ring-shaped fan nets spliced ​​together to form a ring; A portion of the plurality of fixed supports (5) are evenly arranged along the circumference of the inner ring of the spliced ​​multiple ring fan meshes at a first fixed interval; The remaining portions of the plurality of fixed supports (5) are evenly arranged along the straight lines corresponding to each seam of the plurality of ring fan meshes at the second fixed interval.

[0044] Furthermore, the first insulation layer 2 includes: an insulation material layer disposed on the lower side of the common base plate, a fiberglass cloth layer disposed on the lower side of the insulation material layer, and a polyurea layer sprayed on the lower side of the fiberglass cloth layer.

[0045] In some embodiments, the insulation material layer 21 is first laid onto the lower side of the common base plate 1, specifically, by spraying or bonding. One or more layers of fiberglass cloth 22 are then covered on the outer surface of the insulation material layer 21. Four layers of fiberglass cloth are laid in a "generic direction-circumferential direction-generic direction-circumferential direction" manner. The generic direction laying involves first laying a layer of fiberglass cloth along the generic direction (i.e., from one edge of the common base plate through the center to the other edge) without leaving gaps on the lower side of the common base plate 1. The circumferential laying involves laying fiberglass cloth in a continuous loop from the center of the common base plate 1 towards the edge, with the width of the strip of fiberglass cloth as the offset, without gaps. The cross-directional laying of the fiberglass cloth layers ensures that there are no gaps between them, preventing the insulation material layer 21 from falling into the lower tank section 3 even if it detaches. A polyurea layer 23 is sprayed on the underside of the fiberglass cloth layer 22 to passivate and waterproof it. The polyurea layer 23 will not react with the liquid in the lower tank section 3, and can also prevent the liquid in the lower tank section 3 from seeping into the fiberglass cloth layer 22 and the heat insulation material layer 21.

[0046] Furthermore, the thickness of the heat insulation material layer 21 is not less than 20 mm.

[0047] The thickness of the insulation layer 21 is set according to the propellant temperature difference on both sides of the common bottom tank. A thickness of 20mm can meet the insulation effect for a temperature difference of 200℃ on both sides of the common bottom, and the temperature values ​​of the inner and outer sides are close to the propellant temperature. This meets the minimum evaporation rate and the propellant temperature requirements for normal engine operation.

[0048] Furthermore, the width of the upper part of the inner side of the lower box section 3, which is continuously transitioned downward from the vertex of the included angle 31, is greater than or equal to 405 mm.

[0049] After temperature field simulation and experimental verification, the width is greater than or equal to 405 mm, and the temperature of the inner wall of the tank is close to the temperature of the propellant in the lower tank, which meets the minimum evaporation rate and the propellant temperature requirements for normal engine operation.

[0050] Furthermore, the insulation material layer 21 is made of low-density polyurethane foam.

[0051] Low-density polyurethane foam effectively insulates against heat transfer; the density of the low-density polyurethane foam ranges from 75 to 85 kg / cm³. 3 (kg per cubic centimeter).

[0052] Secondly, such as Figure 5 As shown, this utility model embodiment provides a common-bottom storage tank, including: a single-layer common bottom as described above, a lower tank bottom 32, and a cylindrical upper tank 8; The bottom 32 of the lower tank is connected to the lower end of the lower tank section 3; the lower edge of the upper tank 8 is connected to the upper edge of the common bottom plate 1; a second heat insulation layer 9 is provided on the outer side of the upper tank 8.

[0053] Furthermore, the lower part of the second insulation layer 9 extends along the outer side of the common-bottom tank to cover the area below the included angle 31.

[0054] The second insulation layer 9 extends downward from the side of the upper barrel 8 to below the included angle 31, so that there is an overlap between the first insulation layer 2 and the second insulation layer 9, thereby achieving continuous coverage between the insulation layers arranged in different barrel sections and providing better insulation effect.

[0055] Furthermore, the thickness of the second insulation layer 9 is greater than or equal to 15 mm.

[0056] Furthermore, the second insulation layer 9 is made of low-density polyurethane foam.

[0057] Furthermore, the second insulation structure extends 185 mm below the open end of the common base plate.

[0058] Furthermore, the width of the overlapping area between the second insulation layer and the first insulation layer is 80 to 100 millimeters.

[0059] The technical solutions of the present invention will be described in detail below with reference to specific application examples. For technical details not described in the implementation process, please refer to the relevant description above.

[0060] This utility model proposes a heat insulation structure for a single-layer common-bottom storage tank with large temperature difference, which consists of a common-bottom plate 1, a lower tank section 3, an external heat insulation structure (second heat insulation layer 9), a common-bottom heat insulation structure (first heat insulation layer 2), a bottom lug (fixed support 5), a cylinder section lug (lug 6), and a flexible stainless steel anti-fall net 4.

[0061] When the propellant temperature in the upper and lower boxes is >200℃, in order to ensure the insulation effect of the box body and the common bottom, and to form an acceptable temperature gradient for the propellant on the upper and lower sides of the common bottom, the thickness of the outer insulation structure (second insulation layer 9) of the upper box is required to be no less than 15mm, and the insulation layer needs to cover an area of ​​no less than 185mm downward from the large end of the common bottom; the thickness of the common bottom insulation structure (first insulation layer 2) of the common bottom plate 1 is required to be no less than 20mm, and the insulation layer needs to extend downward to the lower box barrel section 3, covering an area of ​​no less than 405mm downward from the large end of the common bottom. When both the upper and lower boxes are low-temperature propellants and the temperature difference is <100℃, in order to ensure the insulation effect of the box body and the common bottom, the thickness of the external insulation structure of the box is required to be no less than 20mm; the thickness of the common bottom plate 1 common bottom insulation structure is no less than 15mm and the insulation layer needs to extend downward to the lower box barrel section 3, covering an area of ​​no less than 405mm downward from the large end face of the common bottom. Twelve sets (six in each set) of fixed supports 5 are installed on the outer surface of the common bottom plate 1 along the busbar direction by fillet welding, totaling 72 fixed supports 5. Twelve fixed supports 5 are installed near the outlet flange 7 of the common bottom plate 1. 48 lugs 6 are installed circumferentially in the lower tank section 3 for fixing the flexible stainless steel anti-fall net 4 to the outside of the common bottom.

[0062] The main structure of the external insulation structure is low-density polyurethane foam (density 35~42kg / cm³). 3 With an external pressure bearing capacity of approximately 0.22 MPa, it can meet the insulation requirements between cryogenic propellants and the external environment. The common-bottom insulation structure, with the main structure being low-density polyurethane foam (density 75~85kg / cm³), is used for insulation. 3This design allows for insulation to withstand large temperature differences exceeding 200℃. Simultaneously, the pressurization pressure required for the propellant tanks of liquid-fueled rocket engines to operate normally is typically 0.25~0.45MPa, while the external pressure bearing capacity of the common-bottom insulation structure is 0.61~0.82MPa, ensuring that the insulation layer will not collapse or delaminate during lower tank pressurization. The outer surface of the polyurethane foam in the common-bottom insulation structure is laid with four layers of fiberglass cloth in a "generic direction-circumferential direction-generic direction-circumferential direction" pattern. When the propellant in the lower tank is kerosene, the outermost layer is sprayed with 0.5mm polyurea to ensure compatibility between the common-bottom insulation structure and kerosene.

[0063] The flexible stainless steel anti-fall net 4 can be customized according to the outer dimensions of the common base plate 1 and the distribution of the bottom lugs (fixed supports 5) and (cylindrical segment) lugs 6. The flexible stainless steel anti-fall net 4 has connecting holes on its inner and outer boundaries. The connecting holes on the outer boundary are secured to the connecting holes of the cylindrical segment lugs 6 using stainless steel wires. The connecting holes on the inner boundary are secured to the bottom lugs in the central area of ​​the common base plate using stainless steel wires. The flexible stainless steel anti-fall net 4 in the middle area of ​​the common base plate 1 is secured to the bottom lugs located on the outer side of the common base plate using stainless steel wires. By controlling the aperture size of the flexible stainless steel anti-fall net 4, the collection of potentially falling objects can be achieved.

[0064] After the common bottom tank is filled, the common bottom plate 1 and the common bottom insulation structure are made of two different materials with different coefficients of linear expansion. The shrinkage of the common bottom insulation structure and the common bottom plate is inconsistent, which may lead to local debonding. During rocket flight, the common bottom insulation structure needs to withstand the vibration load of the rocket body and the swaying load of the propellant in the lower tank, which further increases the risk of debonding and falling. The flexible stainless steel anti-fall net 4 can bear part of the external load and prevent the common bottom insulation structure from falling into the propellant in the lower tank after it falls off, which greatly improves the reliability of the common bottom insulation structure.

[0065] This utility model embodiment has the following technical effects: It breaks through the insulation technology of single-layer common-bottom insulation with a large temperature difference exceeding 200℃, using high-density polyurethane foam (75~85kg / cm3) for insulation, achieving insulation with a large temperature difference exceeding 200℃; it breaks through the technology to prevent the common-bottom insulation layer from falling off, with a flexible filter screen set on the outer side of the common bottom to prevent the insulation layer from falling off; it breaks through the compressive load-bearing technology of the common-bottom insulation layer, with the polyurethane foam having an external pressure bearing capacity of 0.61~0.82MPa, and its outer surface is covered with 4 layers of DW-3 impregnated glass fiber cloth (mounting and winding method: radial → circumferential → radial → circumferential), further improving the external pressure bearing capacity of the foam layer.

[0066] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0067] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0068] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0069] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations falling within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is used in a manner similar to the term "including." Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0070] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A single-layer common-bottom material, characterized in that, include: The common bottom plate (1), the first insulation layer (2) and the cylindrical lower box section (3); The common bottom plate (1) is sleeved on the upper end of the lower box section (3); The first insulation layer (2) covers the lower side of the common bottom plate (1) and, along the angle (31) between the lower side of the common bottom plate (1) and the upper end of the inner side of the lower box section (3), continuously transitions to cover the upper part of the inner side of the lower box section (3).

2. The single-layer common-base as described in claim 1, characterized in that, Also includes: Anti-fall netting (4); The anti-falling net (4) is placed below the first insulation layer (2).

3. The single-layer common-base as described in claim 2, characterized in that, Multiple fixed supports (5) protruding from the outside of the first insulation layer (2) are provided on the lower side of the common bottom plate (1); The anti-falling net (4) is connected to the fixed support (5).

4. The single-layer common-base as described in claim 2, characterized in that, Multiple ear pieces (6) are evenly arranged along the circumferential direction of the inner side surface of the lower box section (3) and below the first insulation layer (2); The outer edge of the anti-fall-off net (4) is connected to the ear piece (6).

5. The single-layer common-base as described in claim 3, characterized in that, The fixed support (5) includes a boss base (51), an upper support (52), and a heat insulation sheet (53); The boss base (51) is connected to the lower side of the common base plate (1); The upper support (52) is connected to the boss base (51), and the heat insulation sheet (53) is provided between the upper support (52) and the boss base (51).

6. The single-layer common-base as described in claim 2, characterized in that, The anti-fall-off net (4) is ring-shaped; The bottom center of the common bottom plate (1) is provided with an outflow flange (7); The inner ring of the anti-falling net (4) is fitted onto the outside of the outlet flange (7).

7. The single-layer common-base as described in claim 3, characterized in that, The anti-fall net (4) is composed of multiple ring-shaped fan nets spliced ​​together to form a ring; A portion of each of the fixed supports (5) is evenly arranged along the circumference of the inner ring of the spliced ​​multi-piece ring fan mesh at a first fixed interval; The remaining portions of the multiple fixed supports (5) are evenly arranged along the straight lines corresponding to each seam of the multiple ring fan mesh at a second fixed interval.

8. The single-layer common-base as described in claim 1, characterized in that, The first insulation layer (2) includes: an insulation material layer disposed on the lower side of the common base plate, a fiberglass cloth layer disposed on the lower side of the insulation material layer, and a polyurea layer sprayed on the lower side of the fiberglass cloth layer.

9. A common-bottom storage tank, characterized in that, include: The single-layer common bottom, lower box bottom (32), and cylindrical upper box (8) as described in claim 1; The bottom of the lower box (32) is connected to the lower end of the lower box section (3); The lower edge of the upper box (8) is connected to the upper edge of the common bottom plate (1); The outer side of the upper tank (8) is provided with a second heat insulation layer (9).

10. The common-bottom storage tank as described in claim 9, characterized in that, The lower part of the second insulation layer (9) extends along the outer side of the common bottom tank and covers the area below the included angle (31).

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