An insulating box

Abstract

The utility model belongs to the technical field of film type enclosure system, especially an insulation box, including from top to bottom set upper plywood, upper polyurethane block, lower polyurethane block and lower plywood, and the upper plywood, the upper polyurethane block, the lower polyurethane block and the lower plywood form sandwich structure, be provided with expansion joint on the upper plywood, be provided with expansion joint on the upper plywood, the expansion joint runs through the upper plywood and the upper polyurethane block. The utility model has the advantages of simple structure, through the setting of expansion joint to compensate the contraction of plywood and polyurethane, avoid the integral damage of insulation box, ensure the temperature insulation effect, solve the plywood and polyurethane contraction problem caused by ultralow temperature, simultaneously add the crack stop belt structure on the basis of expansion joint, connect the polyurethane containing expansion joint into one through the crack stop belt, increase the service life of insulation box whole, facilitate people to use.

Description

Technical Field

[0001] This utility model relates to the technical field of film-type enclosure systems, and in particular to an insulation box. Background Technology

[0002] Membrane-type enclosure systems are crucial equipment for ensuring the safe storage of liquefied natural gas (LNG) at cryogenic temperatures of approximately -163°C. In this system, the insulation box, as the core insulation component, is extensively laid on the inner wall of the tank. Its main function is to provide efficient insulation to control the evaporation rate and to provide a supporting base for the secondary and / or primary shielding layers. Traditional insulation boxes typically employ a laminated composite structure, typically consisting of a sandwich-like main body made of an upper plywood layer, a middle polyurethane foam layer, and a lower plywood layer. When the insulation box is subjected to prolonged cryogenic operating environments, its polyurethane foam and plywood undergo significant cold shrinkage. However, most existing insulation box designs, especially their polyurethane foam core layer, are usually a single, continuous unit without a pre-designed stress relief structure. This "rigid" monolithic structure presents the following problems when facing cryogenic conditions:

[0003] 1. Shrinkage stress accumulation and random cracking problems

[0004] Due to the difference in thermal expansion coefficients between polyurethane foam and plywood, and their different shrinkage rates during cooling, significant thermal stress is generated at the interface and within the polyurethane layer. Existing monolithic structures lack effective stress release and guidance mechanisms, leaving these stresses uncompensated. As a result, stress is randomly released at the weakest points of the material, leading to unpredictable and irregular internal cracks or interfacial delamination in the polyurethane foam layer or the plywood it is bonded to. These random cracks severely compromise the structural integrity of the insulation box and create localized thermal bridges, significantly reducing its insulation performance.

[0005] 2. Limited service life and reliability

[0006] The aforementioned random cracking and crack propagation issues directly restrict the long-term durability and reliability of the insulation box. The continuous generation and accumulation of microcracks accelerates material aging and fatigue, potentially causing severe degradation of insulation performance or structural damage to the insulation box before it reaches its design life, resulting in high maintenance costs and safety hazards.

[0007] In summary, there is an urgent need to propose an insulating box structure that can actively guide shrinkage deformation and effectively suppress crack generation. Utility Model Content

[0008] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide an insulation box to solve the problems of shrinkage caused by plywood and polyurethane at ultra-low temperatures and the damage to the overall strength of polyurethane and reduction of the overall service life of the insulation box caused by expansion joints.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] An insulation box includes an upper plywood, an upper polyurethane block, a lower polyurethane block, and a lower plywood arranged from top to bottom, wherein the upper plywood, the upper polyurethane block, the lower polyurethane block, and the lower plywood form a sandwich structure, and an expansion joint is provided on the upper plywood, the expansion joint penetrating the upper plywood and the upper polyurethane block.

[0011] As a preferred technical solution of this application, the expansion joint includes a first expansion joint and a second expansion joint that are intersected and connected to each other.

[0012] As a preferred technical solution of this application, the first expansion joint is provided along the first direction of the upper plywood.

[0013] As a preferred technical solution of this application, the gap width of the first expansion joint does not exceed 4mm.

[0014] As a preferred technical solution of this application, the second expansion joint is provided along the second direction of the upper plywood.

[0015] As a preferred technical solution of this application, the gap width of the second expansion joint does not exceed 4mm.

[0016] As a preferred technical solution of this application, a heat insulation reinforcement layer is provided between the upper polyurethane block and the lower polyurethane block.

[0017] As a preferred technical solution of this application, the heat insulation reinforcement layer covers the entire plane of the opposing surfaces of the upper polyurethane block and the lower polyurethane block.

[0018] As a preferred technical solution of this application, the upper plywood is provided with smooth holes that penetrate the upper polyurethane block, the heat insulation reinforcement layer, the lower polyurethane block and the lower plywood, and at least two smooth holes are provided.

[0019] The insulating box described in this utility model has the following beneficial effects:

[0020] 1. This solution addresses the uneven shrinkage of plywood and polyurethane caused by ultra-low temperatures by setting expansion joints, while also compensating for the shrinkage of both polyurethane and plywood, preventing overall damage to the insulation box and ensuring thermal insulation performance.

[0021] 2. This solution adds a crack-stopping strip structure to the expansion joint. The crack-stopping strip connects the polyurethane blocks containing the expansion joint into one unit. When the expansion joint damages the overall strength of the polyurethane, the crack-stopping strip can connect the polyurethane blocks into one unit, increasing the overall service life of the insulation box. Attached Figure Description

[0022] The present invention includes the following figures:

[0023] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation on it. Wherein:

[0024] Figure 1 This is a schematic diagram of the structure of an insulation box according to the present invention.

[0025] Figure 2 This is an exploded structural diagram of an insulating box according to the present invention.

[0026] Figure 3 This is a side view of the insulation box described in this utility model.

[0027] The correspondence between the numbers in the attached diagram is as follows:

[0028] 1-Upper plywood; 101-Lower plywood; 2-Upper polyurethane block; 201-Lower polyurethane block; 3-First expansion joint; 301-Second expansion joint; 4-Insulation reinforcement layer; 5-Smooth hole. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings. This detailed description is an illustration of exemplary embodiments of the present invention, including various details of these embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0030] Specifically, refer to Figures 1-3As shown, an insulation box includes an upper plywood 1, an upper polyurethane block 2, a lower polyurethane block 201, and a lower plywood 101 arranged from top to bottom, forming a sandwich structure. An expansion joint is provided on the upper plywood 1, which penetrates the upper plywood 1 and the upper polyurethane block 2. The expansion joint runs along the height direction of the insulation box from the upper plywood 1 to the upper polyurethane block 2, dividing the upper plywood 1 and the upper polyurethane block 2 into multiple independent small units. In this field, due to the inherent difference in the linear expansion coefficients of polyurethane and plywood, and the inconsistent shrinkage characteristics of the two during the ultra-low temperature cooling process, significant cold stress is easily generated at the two-phase interface and inside the polyurethane matrix. This stress will be randomly released at the weakest part of the material, causing significant cold shrinkage deformation of the polyurethane or plywood. To address this issue, this application solves the shrinkage compatibility problem between plywood and polyurethane under ultra-low temperature conditions by setting expansion joints. The expansion joints compensate for the shrinkage of both materials, preventing damage to the overall structure of the insulation box and ensuring stable insulation performance.

[0031] Furthermore, in this embodiment, the expansion joint includes a first expansion joint 3 and a second expansion joint 301 that are interconnected. In practical applications, one or more first expansion joints 3 and second expansion joints 301 can be set according to actual needs.

[0032] Furthermore, in this embodiment, the first expansion joint 3 is provided along the first direction of the upper plywood 1. The first direction on the upper plywood 1 refers to the width direction of the upper plywood 1 on the surface of the upper plywood 1. Alternatively, it can be the length direction of the upper plywood 1 on the upper surface of the upper plywood 1. One or more first expansion joints 3 can be provided according to actual needs.

[0033] Furthermore, in this embodiment, the width of the first expansion joint 3 does not exceed 4mm. Since an excessively wide expansion joint will weaken the effective load-bearing section of the polyurethane and reduce its compressive strength, limiting the width of the joint ensures that even in the worst case, the structure still maintains a minimum level of strength and stability.

[0034] like Figure 1 As shown, further, in this embodiment, the second expansion joint 301 is provided along the second direction of the upper plywood 1. The second direction on the upper plywood 1 refers to the length direction of the upper plywood 1 on the surface of the upper plywood 1. Alternatively, it can also be the width direction of the upper surface of the upper plywood 1, so that the second expansion joint 301 intersects with the first expansion joint 3. Multiple second expansion joints 301 can be provided according to actual needs.

[0035] Furthermore, in this embodiment, the gap width of the second expansion joint 301 does not exceed 4mm. Since an excessively wide expansion joint will weaken the effective load-bearing section of the polyurethane and reduce its compressive strength, limiting the gap width ensures that the structure retains a minimum level of strength and stability even in the worst-case scenario.

[0036] Furthermore, in this embodiment, a heat-insulating reinforcement layer 4 is provided between the upper polyurethane block 2 and the lower polyurethane block 201. Therefore, based on the first expansion joint 3 and the second expansion joint 301, the upper polyurethane block 2, which contains the expansion joint and is divided into multiple independent small units, is connected into one unit through the heat-insulating reinforcement layer 4. Since the expansion joint will damage the overall strength of the upper polyurethane block 2, the heat-insulating reinforcement layer 4 can connect the upper polyurethane block 2, which is divided into multiple independent small units, into one unit, thereby increasing the overall service life of the insulation box. It is worth noting that the heat-insulating reinforcement layer 4 can be a crack-resistant strip or fiberglass cloth. Fiberglass cloth can prevent the lower polyurethane block 201 from cracking along the expansion joint. In addition, other composite materials can also be used.

[0037] Furthermore, in this embodiment, the heat insulation reinforcement layer 4 covers the entire plane of the opposite surfaces of the upper polyurethane block 2 and the lower polyurethane block 201. The heat insulation reinforcement layer 4 uses crack-resistant strips to integrate the surface, which was originally composed of multiple independent polyurethane blocks, into a whole.

[0038] like Figure 2 As shown, further, in this embodiment, the upper plywood 1 is provided with smooth holes 5 corresponding to the upper polyurethane block 2, the heat insulation reinforcement layer 4, the lower polyurethane block 201 and the lower plywood 101. At least two smooth holes 5 are provided. In actual use, the number of smooth holes 5 can also be set according to the actual use requirements, so that when assembling the upper plywood 1, the upper polyurethane block 2, the lower polyurethane block 201 and the lower plywood 101, the smooth holes 5 can be used to achieve the positioning effect of the upper polyurethane block 2, the heat insulation reinforcement layer 4, the lower polyurethane block 201 and the lower plywood 101, so that they are aligned during assembly.

[0039] The implementation principle of an insulation box according to an embodiment of this application is as follows: First, a first expansion joint 3 and a second expansion joint 301 with a thickness of 12mm are pre-reserved along the horizontal and vertical directions of the upper plywood 1, dividing the upper plywood 1 into multiple small units of the same size and independent size. At the same time, the first expansion joint 3 and the second expansion joint 301 extend from top to bottom along the upper plywood 1 towards the bottom of the upper polyurethane block 2, dividing the upper plywood 1 and the upper polyurethane block 2 into multiple independent small units. Multiple smooth holes 5 are pre-reserved on the upper plywood 1, the upper polyurethane block 2, the heat insulation reinforcement layer 4, the lower polyurethane block 201, and the lower plywood 101. Board 101 is positioned and aligned using smooth holes, and then bonded from top to bottom. Next, the heat insulation reinforcement layer 4 completely covers and is bonded to the opposite side of the upper polyurethane block 2 and the lower polyurethane block 201. In the event of extremely low temperatures, the first expansion joint 3 and the second expansion joint 301 can solve the shrinkage problem of the upper plywood 1 and the upper polyurethane block 2, and compensate for the shrinkage of the upper plywood 1 and the upper polyurethane block 2 through the first expansion joint 3 and the second expansion joint 301, so as to avoid damage to the insulation box as a whole and ensure the heat insulation effect. At the same time, the heat insulation reinforcement layer 4 connects the polyurethane blocks containing the expansion joints into one unit. The expansion joints will damage the overall strength of the polyurethane. The heat insulation reinforcement layer 4 can connect the upper polyurethane blocks 2, which are divided into multiple independent small units, into one unit, thereby increasing the overall service life of the insulation box.

[0040] All structures in this application can be customized in terms of material and length according to actual usage. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted accordingly.

[0041] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0042] The above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present utility model should be included in the protection scope recorded in the claims.

Claims

1. An insulating box, characterized in that, It includes an upper plywood, an upper polyurethane block, a lower polyurethane block, and a lower plywood arranged from top to bottom, and the upper plywood, the upper polyurethane block, the lower polyurethane block, and the lower plywood form a sandwich structure. An expansion joint is provided on the upper plywood, and the expansion joint passes through the upper plywood and the upper polyurethane block.

2. The insulation box as described in claim 1, characterized in that: The expansion joint includes a first expansion joint and a second expansion joint that are intersected and connected.

3. The insulation box as described in claim 2, characterized in that: The first expansion joint is provided along the first direction of the upper plywood.

4. The insulation box as described in claim 3, characterized in that: The width of the first expansion joint shall not exceed 4mm.

5. The insulation box as described in claim 2, characterized in that: The second expansion joint is provided along the second direction of the upper plywood.

6. The insulation box as described in claim 5, characterized in that: The width of the second expansion joint shall not exceed 4mm.

7. The insulation box as described in claim 1, characterized in that: A heat insulation reinforcement layer is provided between the upper polyurethane block and the lower polyurethane block.

8. The insulation box as described in claim 7, characterized in that: The thermal insulation reinforcement layer covers the entire plane of the opposing surfaces of the upper and lower polyurethane blocks.

9. The insulation box as described in claim 7, characterized in that: The upper plywood has smooth holes that penetrate the upper polyurethane block, the heat insulation reinforcement layer, the lower polyurethane block, and the lower plywood, and there are at least two smooth holes.

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