An inflatable refrigerated thermal insulation layer and a thermal insulation material thereof

Abstract

The application discloses an inflatable refrigeration and heat preservation layer and heat preservation material thereof, and relates to the technical field of cold chain storage and transportation and flexible inflatable equipment. The heat preservation layer is composed of an outer protective layer, an inner membrane and an inner heat preservation layer arranged on the inner side of the inner membrane. The outer protective layer and the inner membrane form a first inflatable cavity, and the first inflatable cavity is provided with a radiation-resistant intermediate layer. A through hole is formed in the radiation-resistant intermediate layer, and a flexible micro-tension pull belt is arranged in the through hole. Resistance limiting nodes are arranged on the two sides of the pull belt to limit and fix the radiation-resistant intermediate layer inside the inflatable cavity. The base of the radiation-resistant intermediate layer is provided with protruding portions on the two sides. When the outer protective layer is locally deformed under pressure, the protruding portions are preferentially in contact with the outer protective layer or the inner membrane, thereby preventing the base of the radiation-resistant intermediate layer from being flatly attached. The application can maintain the heat insulation gap under dynamic pressure conditions, reduce the probability of cold bridge formation, and improve the heat insulation stability and engineering applicability of the flexible inflatable heat preservation structure.

Description

Technical Field

[0001] This invention relates to the field of cold chain storage and transportation and flexible inflatable equipment technology, specifically to an inflatable refrigeration insulation layer and its insulation material. Background Technology

[0002] Existing mobile cold storage facilities, inflatable refrigerated boxes, and similar flexible insulation equipment mostly employ single-layer membrane structures or use foam materials filled within the membrane layer for insulation. While these structures can meet the requirements for lightweight and retractable use to some extent, they still have shortcomings in terms of thermal insulation performance.

[0003] To improve thermal insulation, existing technologies also employ metal reflective films for anti-radiation thermal insulation. These solutions typically require a certain air gap between the reflective surface and adjacent layers to reduce heat radiation transfer. However, in flexible inflatable structures, due to factors such as internal air pressure changes, external wind loads, handling compression, or localized pressure, the internal reflective film is prone to wrinkling, shifting, or contact with adjacent layers. Once the reflective film adheres extensively to the outer or inner layer, the original air gap decreases or disappears, reducing the anti-radiation thermal insulation effect. Simultaneously, it creates continuous contact areas, increasing the solid-state heat transfer path and affecting the overall insulation performance.

[0004] In existing technologies, common solutions to the aforementioned problems mainly involve increasing the thickness of the foamed insulation material or setting reflective material only on one side of the membrane layer. The former increases the structural thickness and weight, affecting the folding and storage performance of the flexible inflatable structure; the latter has limited thermal insulation effect. Existing technologies lack a structural solution suitable for flexible inflatable structures that can minimize planar adhesion between the reflective membrane substrate and adjacent membrane layers under external pressure.

[0005] Therefore, it is necessary to provide a new inflatable refrigeration insulation layer and its insulation material to improve the above-mentioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide an inflatable refrigeration insulation layer and its insulation material to solve the problem that the reflective film in the existing flexible inflatable insulation structure is prone to surface adhesion with adjacent film layers under pressure, resulting in a reduction in the heat insulation gap and a decrease in the heat insulation performance.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an inflatable refrigeration and heat preservation layer, which includes, from the outside to the inside, an outer protective layer, an inner membrane, and an inner heat preservation layer disposed inside the inner membrane;

[0008] The outer protective layer is sealed to the periphery of the inner diaphragm, together forming a closed first air-filled cavity; The first inflation chamber is provided with an anti-radiation intermediate layer, which is a flexible thin film substrate with a low emissivity metal coating and is not directly fixed to the outer protective layer and the periphery edge of the inner diaphragm. Multiple flexible micro-tension straps are arrayed inside the first inflation cavity, and the two ends of each flexible micro-tension strap are fixedly connected to the inner wall of the outer protective layer and the outer wall of the inner diaphragm, respectively. The anti-radiation intermediate layer has through holes corresponding to the flexible micro-tension straps, and the flexible micro-tension straps are inserted into the corresponding through holes; On a single flexible micro-tension belt, a first resistance limiting node and a second resistance limiting node are fixed at positions on opposite sides of the anti-radiation intermediate layer; The radial dimensions of both the first resistance limiting node and the second resistance limiting node are larger than the diameter of the through hole, so as to physically clamp and limit the anti-radiation intermediate layer between the first resistance limiting node and the second resistance limiting node. The anti-radiation intermediate layer has raised portions protruding from the substrate surface distributed in an array on both sides of the substrate surface; When the outer protective layer is subjected to external pressure and undergoes local deformation towards the inner membrane, the raised portion preferentially abuts against the outer protective layer or the inner membrane to prevent the substrate of the anti-radiation intermediate layer from being surface-fitted with the outer protective layer or the inner membrane.

[0009] Furthermore, the raised portion includes a first peak protruding toward the outer protective layer and a second peak protruding toward the inner diaphragm; the maximum protrusion height of the tip of the raised portion relative to its base is 10% to 20% of the nominal thickness of the first inflation cavity.

[0010] Furthermore, the substrate of the anti-radiation intermediate layer is a flexible thin film with stable planar dimensions, and the raised portion is formed by continuous deformation of the substrate of the flexible thin film through mechanical imprinting; the geometric shape of the raised portion is one or more of the following: conical, truncated cone, pyramidal, or hemispherical.

[0011] Furthermore, the first resistance limiting node and the second resistance limiting node are hot-melt thickened sections, knotted sections, or fasteners fixed on the flexible micro-tension belt.

[0012] Furthermore, the anti-radiation intermediate layer is an aluminum-plated polyester film or a silver-plated polymer film, and the edge of the perforation hole is provided with a reinforcing sealing ring.

[0013] Furthermore, the inner insulation layer is located outside the first air-filled cavity, and its interior is encapsulated with aerogel felt or microporous insulation material.

[0014] Furthermore, the outer protective layer has a white high-reflectivity coating on the side of its surface facing away from the first inflation cavity, and the material of the outer protective layer includes tear-resistant TPU or PVC composite mesh fabric.

[0015] The present invention also provides a thermal insulation material made using the above-mentioned inflatable refrigeration insulation layer.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an anti-radiation intermediate layer within the first inflation cavity and uses a flexible micro-tension strap to pass through and limit the anti-radiation intermediate layer, so that the anti-radiation intermediate layer can be kept inside the first inflation cavity instead of being directly fixed to the outer protective layer or the inner membrane, thereby facilitating the formation of a heat insulation gap on both sides of the anti-radiation intermediate layer.

[0017] This invention achieves physical clamping and positioning of the anti-radiation interlayer on the flexible micro-tension belt by setting a first resistance limiting node and a second resistance limiting node on the belt, with the node size larger than the aperture of the through hole. This structure enables the anti-radiation interlayer to maintain a relatively stable position under normal inflation, reducing disordered drift and displacement of the anti-radiation interlayer within the cavity.

[0018] This invention addresses this issue by creating raised portions on both sides of the anti-radiation interlayer substrate. This allows the anti-radiation interlayer to preferentially contact the outer protective layer or inner membrane via these raised portions when the outer protective layer undergoes localized deformation under pressure, rather than directly adhering to the substrate of the anti-radiation interlayer over a large area. This structure helps reduce the planar contact area and decreases the likelihood of forming a continuous solid-state heat transfer path.

[0019] This invention utilizes the combination of a flexible micro-tension band and a raised portion to achieve different functions under normal and compressed conditions: under normal inflation, the flexible micro-tension band positions and limits the anti-radiation interlayer; under localized compression, the raised portion preferentially contacts adjacent membrane layers and forms localized support. This combination helps to reduce the adverse effects of external pressure on the thermal insulation gap.

[0020] This invention helps reduce radiative heat transfer by setting the anti-radiation intermediate layer as a flexible thin-film substrate with a low-emissivity metal coating; and by placing the inner insulation layer outside the first air-filled cavity and encapsulating it with a low-thermal-conductivity material, it further helps reduce heat transfer through the structural layers. The above structural combination improves the overall thermal insulation performance of the insulation layer.

[0021] This invention improves the structural stability of the penetration area and reduces the risk of damage to the penetration area during long-term use by setting the penetration hole on the anti-radiation intermediate layer and setting a reinforcing sealing ring at the edge of the penetration hole.

[0022] This invention improves the overall structural durability by using a tear-resistant TPU or PVC composite mesh fabric as the outer protective layer; and by applying a white, high-reflectivity coating to the outside of the outer protective layer, it helps reduce the absorption of external radiant heat. This structure is suitable for use in flexible inflatable refrigeration and insulation equipment.

[0023] The structural forms adopted in this invention, such as the pull strap insertion, node limiting, film imprinting, and heat sealing connection, can be integrated with existing flexible inflatable product processing technology, making it convenient for processing, manufacturing, and implementation. Attached Figure Description

[0024] Figure 1 This is a partial cross-sectional structural diagram of an inflatable refrigeration insulation layer and its insulation material in a normal inflatable suspension state, according to the present invention. Figure 2 This is a partial cross-sectional structural diagram of an inflatable refrigeration insulation layer and its insulation material under localized pressure and contact conditions, according to the present invention. Figure 3 This is a partially enlarged structural diagram of an inflatable refrigeration insulation layer and its insulation material, in which a flexible micro-tension strap passes through an anti-radiation intermediate layer and is clamped and limited by a resistance limiting node. Figure 4 This is a three-dimensional structural diagram of an inflatable refrigeration insulation layer and its anti-radiation intermediate layer in the insulation material, according to the present invention.

[0025] In the figure: 1. Outer protective layer; 2. Inner diaphragm; 3. Inner insulation layer; 4. First air-filling cavity; 5. Anti-radiation intermediate layer; 501. Through hole; 502. Raised part; 6. Flexible micro-tension band; 601. First resistance limiting node; 602. Second resistance limiting node. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-4 The technical solution and working principle of the present invention will be described in detail.

[0027] This embodiment provides an inflatable cooling and insulation layer, comprising, from the outside to the inside, an outer protective layer 1, an inner membrane 2, and an inner insulation layer 3 disposed inside the inner membrane 2. The outer protective layer 1 and the inner membrane 2 are sealed together at their peripheral edges by high-frequency welding or hot-melt process, forming a closed first inflatable cavity 4. In practical applications, the outer protective layer 1 is made of tear-resistant TPU or PVC composite mesh fabric; the surface of the outer protective layer 1 facing away from the first inflatable cavity 4 may be coated with a white high-reflectivity coating to reduce the absorption of radiant heat on the outer surface. The inner insulation layer 3 is located outside the first inflatable cavity 4, and the inner insulation layer 3 may be encapsulated with aerogel felt or microporous insulation material to reduce heat transfer to the inside.

[0028] An anti-radiation intermediate layer 5 is disposed inside the first inflation chamber 4. The substrate of the anti-radiation intermediate layer 5 is a flexible film with stable planar dimensions, specifically an aluminum-plated polyester film or a silver-plated polymer film, and its surface has a low-emissivity metal coating. The anti-radiation intermediate layer 5 exists independently inside the first inflation chamber 4. The peripheral edge of the anti-radiation intermediate layer 5 is not directly fixed to the outer protective layer 1 and the inner membrane 2, which helps to reduce the formation of a continuous solid heat transfer path between the anti-radiation intermediate layer 5 and adjacent layers through peripheral connection parts.

[0029] Multiple flexible micro-tension bands 6 are arrayed within the first inflation chamber 4. Each flexible micro-tension band 6 has its two ends fixedly connected to the inner wall of the outer protective layer 1 and the outer wall of the inner diaphragm 2, respectively. An array of through holes 501 are formed on the thin film substrate of the anti-radiation intermediate layer 5. The positions of the through holes 501 correspond to the positions of the flexible micro-tension bands 6, and reinforcing sealing rings can be provided at the edges of the through holes 501. The flexible micro-tension bands 6 are correspondingly inserted into the through holes 501.

[0030] On a single flexible micro-tension band 6, a first resistance limiting node 601 and a second resistance limiting node 602 are respectively fixed at opposite positions on both sides of the anti-radiation intermediate layer 5. The first resistance limiting node 601 and the second resistance limiting node 602 are heat-fused thickened sections, knotted sections, or sleeved fasteners fixed on the flexible micro-tension band 6. The outer diameters of the first resistance limiting node 601 and the second resistance limiting node 602 are both larger than the diameter of the through hole 501, so as to physically clamp and limit the anti-radiation intermediate layer 5 between the first resistance limiting node 601 and the second resistance limiting node 602. When the first inflation chamber 4 is inflated to the nominal working air pressure, the outer protective layer 1 and the inner diaphragm 2 are stretched outward, the flexible micro-tension band 6 is in a stretched state, and the first resistance limiting node 601 and the second resistance limiting node 602 limit the anti-radiation intermediate layer 5 accordingly.

[0031] The anti-radiation intermediate layer 5 has raised portions 502 arrayed on both sides of its substrate surface. The raised portions 502 are formed by continuous mechanical molding of the flexible film substrate. The geometry of the raised portions 502 is one or more of a cone, truncated cone, pyramid, or hemispherical shape. Each raised portion 502 includes a first peak protruding towards the outer protective layer 1 and a second peak protruding towards the inner membrane 2; the first and second peaks may be arranged correspondingly or alternately. The maximum protrusion height of the tip of the raised portion 502 relative to its substrate is 10% to 20% of the nominal thickness of the first inflation cavity 4.

[0032] When the outer protective layer 1 undergoes localized deformation towards the inner membrane 2 under external pressure, the outer protective layer 1 in the pressured area moves closer to the inner membrane 2, and the corresponding flexible micro-tension band 6 becomes relaxed and bent. At this time, the raised portion 502 on the surface of the anti-radiation intermediate layer 5 preferentially abuts against the outer protective layer 1 or the inner membrane 2. This structure allows the main body of the anti-radiation intermediate layer 5 to maintain a gap with the adjacent layer under localized pressure conditions, thereby reducing the possibility of forming a continuous solid heat transfer path and preventing the substrate of the anti-radiation intermediate layer 5 from forming a planar bond with the outer protective layer 1 or the inner membrane 2.

[0033] In some embodiments, a thermal insulation material assembly for forming the aforementioned anti-radiation intermediate layer 5 may also be provided. This thermal insulation material assembly includes a flexible thin-film substrate. The surface of the flexible thin-film substrate has a low-emissivity metal coating, and its two side surfaces have arrayed raised portions 502, and arrayed perforations 501 are provided. The perforations 501 are used for the flexible micro-tension band 6 to pass through, so that the flexible thin-film substrate can be limited on the flexible micro-tension band 6 by the resistance limiting nodes 601 and 602 provided on both sides of the flexible micro-tension band 6.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An inflatable refrigeration and insulation layer, characterized in that, From the outside to the inside, it includes an outer protective layer (1), an inner membrane (2), and an inner heat insulation layer (3) disposed inside the inner membrane (2). The outer protective layer (1) is sealed to the periphery of the inner diaphragm (2) to form a closed first air-filled cavity (4). The first inflation chamber (4) is provided with an anti-radiation intermediate layer (5). The anti-radiation intermediate layer (5) is a flexible thin film substrate with a low emissivity metal coating and is not directly fixed to the periphery of the outer protective layer (1) and the inner diaphragm (2). Multiple flexible micro-tension bands (6) are arrayed in the first inflation cavity (4). The two ends of each flexible micro-tension band (6) are fixedly connected to the inner wall of the outer protective layer (1) and the outer wall of the inner diaphragm (2), respectively. The anti-radiation intermediate layer (5) has a through hole (501) corresponding to the flexible micro-tension band (6), and the flexible micro-tension band (6) is inserted into the corresponding through hole (501). On a single flexible micro-tension tether (6), a first resistance limiting node (601) and a second resistance limiting node (602) are fixed at positions on opposite sides of the anti-radiation intermediate layer (5). The radial dimensions of both the first resistance limiting node (601) and the second resistance limiting node (602) are larger than the diameter of the through hole (501); The anti-radiation intermediate layer (5) has raised portions (502) that protrude from the substrate surface on both sides of the substrate surface.

2. The inflatable refrigeration and insulation layer according to claim 1, characterized in that, The raised portion (502) includes a first peak protruding toward the outer protective layer (1) and a second peak protruding toward the inner diaphragm (2); the maximum protrusion height of the tip of the raised portion (502) relative to its base is 10% to 20% of the nominal thickness of the first air cavity (4).

3. The inflatable refrigeration and insulation layer according to claim 1, characterized in that, The substrate of the anti-radiation intermediate layer (5) is a flexible thin film with stable planar dimensions. The raised portion (502) is formed by continuous deformation of the substrate of the flexible thin film through mechanical imprinting. The geometric shape of the raised portion (502) is one or more of the following: conical, truncated cone, pyramidal, or hemispherical.

4. The inflatable refrigeration and insulation layer according to claim 1, characterized in that, The first resistance limiting node (601) and the second resistance limiting node (602) are hot-melt thickened sections, knotted sections or fasteners fixed on the flexible micro-tension belt (6).

5. The inflatable refrigeration and insulation layer according to claim 1, characterized in that, The anti-radiation intermediate layer (5) is an aluminum-plated polyester film or a silver-plated polymer film, and the edge of the through hole (501) is provided with a reinforcing sealing ring.

6. The inflatable refrigeration and insulation layer according to claim 1, characterized in that, The inner insulation layer (3) is located outside the first air-filled cavity (4), and its interior is encapsulated with aerogel felt or microporous insulation material.

7. The inflatable refrigeration and insulation layer according to claim 1, characterized in that, The outer protective layer (1) has a white high-reflection coating on the side of the outer protective layer (1) away from the first inflation cavity (4), and the material of the outer protective layer (1) includes tear-resistant TPU or PVC composite mesh fabric.

8. A thermal insulation material, characterized in that, It is made using the inflatable refrigeration insulation layer as described in any one of claims 1 to 7.

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