Normal pressure air insulation structure and air insulation box having the same

Abstract

The present invention discloses a normal pressure air insulation structure and an air insulation box having the same, wherein the normal pressure air insulation structure comprises: an inner liner layer, the inner liner layer encloses an upwardly open storage cavity; an outer envelope, the outer envelope covers the inner liner layer, the upper end of the outer envelope is connected to the upper end of the inner liner layer, an air cavity with vents is formed between the outer envelope and the inner liner layer, and the inner liner layer and the outer envelope are both made of foldable materials; a hanging support, the hanging support comprises a connecting part, and the connecting part is connected to the top of the inner liner layer and the top of the outer envelope. The normal pressure air insulation structure separates the insulation function and the supporting function of the air cavity through the hanging support, which is beneficial to increase the insulation effect of the air cavity. When the normal pressure air insulation structure is not needed, it can be detached from the hanging support to achieve folding, thereby reducing the transportation cost.

Description

Technical Field

[0001] The present invention relates to the technical field of heat preservation equipment, and in particular to a normal pressure air heat preservation structure and an air heat preservation box having the same. Background Art

[0002] At present, most of the insulation equipment used for fresh food transportation is disposable white foam boxes, because most insulation boxes take up a lot of space and the one-way transportation cost is too high. Insulation boxes with airbag insulation are more portable. Insulation boxes with airbag structure generally use pressurized airbag insulation. The pressure inside the airbag is greater than the external air pressure. A small number of them use normal pressure airbag insulation.

[0003] However, when using an airbag structure at normal pressure, there is a common problem that the airbag is squeezed by the objects and deforms greatly, thus affecting the thermal insulation effect of the thermal insulation box. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] In the first aspect, the present invention provides a normal pressure air insulation structure, including an inner liner layer, the inner liner layer enclosing a storage cavity open upward; an outer envelope, the outer envelope covers the inner liner layer, the upper end of the outer envelope is connected to the upper end of the inner liner layer, an air cavity with ventilation holes is formed between the outer envelope and the inner liner layer, and the inner liner layer and the outer envelope are both made of foldable materials; a hanging support, the hanging support includes a connecting portion, and the connecting portion is connected to the top of the inner liner layer and the top of the outer envelope.

[0006] A normal-pressure air insulation structure provided according to an embodiment of the present invention has at least the following beneficial effects: an inner liner layer encloses an upwardly open storage space for placing items that need to be insulated, an outer layer covers the inner liner layer, and the upper end of the outer layer is connected to the upper end of the inner liner layer to form an air cavity with a vent. The normal-pressure air insulation structure also includes a hanging support, which includes a connecting portion, and the connecting portions are both connected to the top of the inner liner layer and the outer layer. The hanging support is used to connect the inner liner layer and the outer layer to a supporting substrate of an external device, so that the load borne by the inner liner layer is applied to the supporting substrate of the external device through the hanging support, which is beneficial to reduce the extrusion of the air cavity after the inner liner layer is borne by the load, reduce the deformation of the air cavity, and thus increase The thermal insulation effect of the normal-pressure air insulation structure; the inner liner layer and the outer envelope are both made of foldable materials, and ventilation holes are provided on the air cavity. When the normal-pressure air insulation structure is not needed, the inner liner layer and the outer envelope can be folded to squeeze the air out of the air cavity, thereby reducing the space occupied by the normal-pressure air insulation structure and increasing the portability of the normal-pressure air insulation structure. When the normal-pressure air insulation structure needs to be used, the hanging support is hung on the supporting base of the external device to unfold the normal-pressure air structure, and air enters the air cavity from the ventilation holes, thereby achieving the air insulation effect. By controlling the size of the ventilation holes in the air cavity, the flow of air in the air cavity with the outside world when in a thermal insulation state can be controlled, thereby controlling its thermal insulation effect.

[0007] According to some embodiments of the present invention, the atmospheric pressure air insulation structure further includes a sealing member, which is disposed at the vent hole and is used to open and close the air cavity.

[0008] A sealing piece is arranged at the vent hole and is used to open and close the air cavity. When the normal-pressure air insulation structure is not needed, the sealing piece is opened, the inner liner layer and the outer layer can be folded, and the air is squeezed out of the air cavity through the sealing piece, thereby reducing the space occupied by the normal-pressure air insulation structure; when the normal-pressure air insulation structure needs to be used, the hanging support piece is hung on the supporting base of the external device, so that the normal-pressure air insulation structure is unfolded, and air enters the air cavity from the sealing piece. When the air fills the air cavity, the sealing piece is closed to form a relatively closed air cavity, which is beneficial to increasing the insulation effect of the normal-pressure air insulation structure. The setting of the sealing piece is beneficial to forming a relatively closed air cavity, which is beneficial to the air cavity increasing the insulation effect of the inner liner layer.

[0009] According to some embodiments of the present invention, two vents are provided on the air cavity, and the sealing member comprises an exhaust check valve and an intake check valve, and the exhaust check valve and the intake check valve are respectively provided at the two vents.

[0010] Two ventilation holes are arranged on the air cavity, and the sealing part comprises an exhaust one-way valve and an air inlet one-way valve. When the normal-pressure air insulation structure is unfolded or folded, a pressure difference is formed between the air cavity and the outside, and there is no need to control the valve. The air can be freely discharged or enter the air cavity through two one-way valves in different directions, which is beneficial to increasing the convenience of using the normal-pressure air insulation structure for users. When the normal-pressure air insulation structure is unfolded and is in an insulation state, since the pressure of the air cavity is almost the same as that of the external air, the air fluidity between the two is relatively small, which is beneficial to ensuring the insulation performance of the normal-pressure air insulation structure.

[0011] According to some embodiments of the present invention, it also includes an inner grille, the bottom surface of the outer envelope is located below the bottom surface of the inner liner layer, the air cavity includes a vertical cavity and a horizontal cavity, the vertical cavity is located between the inner peripheral surface of the outer envelope and the outer peripheral surface of the inner liner layer, the horizontal cavity is located between the inner bottom surface of the outer envelope and the outer bottom surface of the inner liner layer, the inner grille is arranged in the air cavity, and the inner grille divides the air cavity from the inside to the outside into several layers of air partitions, and through holes are arranged between adjacent air partitions; the thickness of each air partition is set to 0.008 to 0.026m.

[0012] The normal-pressure air insulation structure also includes an inner grille, the bottom surface of the outer envelope is located below the bottom surface of the inner liner layer, the air cavity includes a vertical cavity and a horizontal cavity, the vertical cavity is located between the inner peripheral surface of the outer envelope and the outer peripheral surface of the inner liner layer, and the horizontal cavity is located between the inner bottom surface of the outer envelope and the outer bottom surface of the inner liner layer, that is, the outer envelope can insulate the items in the cavity from the peripheral surface and the bottom surface, the inner grille is arranged in the air cavity, and the air cavity is divided into several layers of air barriers from the inside to the outside, through holes are arranged between adjacent air barriers, and the thickness of each air barrier layer is set to 0.008-0.026m. By controlling the thickness of each air barrier layer, the convection of air in the air barrier layer can be reduced, and the items in the inner liner are insulated layer by layer through the multiple air barriers arranged from the inside to the outside, which is beneficial to increase the insulation effect of the normal-pressure air insulation structure, and through holes are arranged between the air barriers, which is beneficial for the air to be discharged or enter the air barrier layer through the through holes and the vents of the air cavity between the air barriers. By controlling the thickness of each layer of vertical cavity and transverse cavity, the degree of air convection in the vertical cavity and transverse cavity is reduced, thereby improving the thermal insulation effect in the air thermal insulation state.

[0013] According to some embodiments of the present invention, the inner grille divides the horizontal cavity into several layers of sub-horizontal cavities, and the inner grille divides the vertical cavity into several layers of sub-vertical cavities, and the thickness of each layer of sub-vertical cavity is L1, and satisfies the formula: L1 3 =(Gr1V 2 ) / (ga v Δt1), where g is the acceleration due to gravity, a vis the volume change coefficient of air, Δt1 is the temperature difference on both sides of the sub-vertical cavity, Δt1 is set to 1 to 30°C, V is the kinematic viscosity of air, Gr is the Grashof number, and Gr1 of the sub-vertical cavity is ≤ 2860; the thickness of each layer of the sub-horizontal cavity is L2, and satisfies the formula: L2 3 =(Gr2V 2 ) / (ga v Δt2), where g is the acceleration due to gravity, a v is the volume change coefficient of air, Δt2 is the temperature difference on both sides of the sub-transverse cavity, Δt2 is set to 1 to 30°C, V is the kinematic viscosity of air, Gr is the Grashof number, and Gr2 of the sub-transverse cavity is ≤2430.

[0014] According to the calculation formula of the Grashof number, through the gravitational acceleration, the volume change coefficient of the air, the temperature difference on both sides of the sub-vertical cavity or sub-transverse cavity and the kinematic viscosity of the air, by controlling the value range of the Grashof number, the appropriate thickness range of the sub-vertical cavity and sub-transverse cavity can be selected, which can reduce the air convection in the air barrier and help increase the thermal insulation effect of the normal pressure air insulation structure.

[0015] According to some embodiments of the present invention, the atmospheric pressure air insulation structure further includes a support plate, which is disposed in the storage cavity and abuts against the inner bottom surface of the liner layer.

[0016] The normal pressure air insulation structure also includes a support plate, which is arranged in the storage cavity and abuts against the inner bottom surface of the liner layer. The support plate supports the items placed in the storage cavity of the liner layer, which is helpful to reduce the problem that the bottom surface of the liner layer is locally deformed due to the pressure of the items, thereby causing a large change in the shape of the air cavity, thereby reducing the insulation effect, and is helpful to increase the practicality of the normal pressure air insulation structure.

[0017] According to some embodiments of the present invention, a bottom support is further included, the outer covering layer covers the outer side of the inner liner layer, and the bottom support is connected to the lower end of the inner liner layer and the lower end of the outer covering layer.

[0018] The outer layer covers the outer side surface of the inner liner layer, and the bottom support is connected to the outer bottom surface of the inner liner layer. The bottom support is used as the base of the normal-pressure air insulation structure. The setting of the bottom support can be used to strengthen the supporting effect of the normal-pressure air insulation structure, which is beneficial to avoid the risk of damage caused by excessive pressure on the inner liner layer, and is beneficial to increase the durability of the normal-pressure air insulation structure.

[0019] According to some embodiments of the present invention, a side wall support is further included. The side wall support is foldably connected as a whole, and the side wall support is connected to the side wall of the inner liner layer.

[0020] The normal-pressure air insulation structure also includes a side wall support member, which is foldably connected as a whole and is connected to the inner side wall of the inner liner layer to support items placed in the storage cavity of the inner liner layer. This helps to reduce the shaking of items placed in the storage cavity and the collision of items with the side wall of the inner liner layer, which causes the shape of the air cavity to change, affecting the insulation effect of the differential-pressure air insulation structure and helping to increase the practicality of the normal-pressure air insulation structure.

[0021] In a second aspect, the present invention further provides an air insulation box, comprising a box body, a storage space formed inside the box body; a normal-pressure air insulation structure as shown in any one of the first aspects, wherein the normal-pressure air insulation structure is arranged in the storage space, and a hanging support is connected to the box body.

[0022] An air insulation box provided according to an embodiment of the present invention has at least the following beneficial effects: the air insulation box comprises a box body and the above-mentioned normal-pressure air insulation structure, and by connecting the suspension support of the normal-pressure air insulation structure to the box body, the normal-pressure air insulation structure can be conveniently unfolded, and the load on the inner liner layer can be applied to the external box body, which is beneficial to maintaining the shape of the air cavity inside the air insulation box, thereby maintaining the insulation performance of the air insulation box; the external box body can protect the internal normal-pressure air insulation structure, absorb external impact during transportation, and exert tension on the inner liner layer through the suspension support, so that the tension and pressure of the inner liner layer are in a balanced state, and the inner wall of the inner liner layer has a certain tension, which is beneficial to reduce the deformation of the air cavity squeezed by the objects, and is beneficial to reduce the position deviation of the inner liner layer during transportation, thereby maintaining the insulation effect of the air insulation box.

[0023] According to some embodiments of the present invention, the box body includes a cover plate and a bottom shell, the bottom shell as a whole is foldably connected, and the hanging support is connected to the upper end of the bottom shell.

[0024] The box body includes a cover plate and a bottom shell, and the bottom shell is foldably connected as a whole. During transportation, the built-in normal-pressure air insulation structure of the air insulation box can be compressed and folded, and the external bottom shell can be disassembled, thereby reducing the space occupied by the air insulation box when not in use, which is beneficial to reducing transportation costs and increasing the practicality of the air insulation box.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1A schematic diagram of the structure of an air insulation box provided in some embodiments of the present invention;

[0028] Figure 2 for Figure 1 AA cross-sectional view of an air insulated box shown in FIG.

[0029] In the attached drawings: 100 - inner liner layer; 200 - outer cladding layer; 300 - air cavity; 310 - vertical cavity; 320 - horizontal cavity; 330 - ventilation hole; 400 - suspension support; 500 - inner grille; 510 - through hole; 600 - box body. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, the meaning of "several" is an indefinite quantity, the meaning of "multiple" is more than two, "greater than", "less than", "exceed", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If there is a description of the first and the second, it is only for the purpose of distinguishing the technical features, and it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. In addition, "and / or" appearing in the full text represents three parallel solutions. For example, A and / or B represents the solution satisfied by A, the solution satisfied by B, or the solution satisfied by both A and B.

[0033] In the description of the present invention, if there is a short sentence containing multiple parallel features, the attributive in it limits the closest feature, for example: B, C set on A, E connected to D, which means that B is set on A, E is connected to D, and does not constitute a limitation on C; but the attributives that express the relationship between features, such as "set at intervals", "circular arrangement", etc., do not belong to this category. If the word "all" is placed before the attributive, it means that all the features in the short sentence are limited, such as B, C, D all set on A, which means that B, C and D are all set on A.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] At present, the main insulation container for refrigerated transportation of fresh agricultural products is white foam box, which is white garbage. It causes multiple pollution to the environment during the production and life cycle. However, white foam box has low cost and good insulation effect, and cannot be replaced at present. The main reasons are: EPS white foam box has low cost, and the cost is acceptable as a one-time use in fresh transportation; others such as EPP insulation box and PU plastic insulation box have high strength, high cost, and can be used multiple times, but due to the one-way flow of goods, large volume and high cost, they are not easily accepted by the market. Generally, foldable insulation boxes made of EPP and PU require a certain thickness to have a better insulation effect, which makes their volume still large after folding.

[0036] At present, the airbag-type thermal insulation boxes with good folding performance are roughly divided into pressurized airbag structures and normal pressure airbag structures. Most of the airbag-type thermal insulation boxes use pressurized airbags for insulation, but this causes a large change in the shape and size of the airbag before and after inflation. The volume of the airbag increases rapidly after inflation. The thermal insulation box is made of many materials, the shape is not fixed, and the manufacturing process is complicated. If the airbag becomes smaller, the manufacturing difficulty increases, the pressure on the airbag is affected, and the support becomes worse. For the normal pressure airbag thermal insulation structure, the shape of the airbag is easily deformed by the extrusion of the object, and the thermal insulation effect is poor.

[0037] Combine the following Figure 1-Figure 2 Embodiments of the present invention are described.

[0038] Example 1, see Figure 1-Figure 2 An air insulation box includes a box body 600, in which a normal pressure air insulation structure is arranged. The box body 600 is a common plastic box with an upper end opening. The normal pressure air insulation structure includes: an inner liner layer 100, an outer layer 200 and a hanging support 400. The inner liner layer 100 forms an upwardly open storage cavity. The inner liner layer 100 covers the outer layer 200. The upper end of the outer layer 200 is connected to the upper end of the inner liner layer 100. An air cavity 300 with a vent 330 is formed between the outer layer 200 and the inner liner layer 100. The inner liner layer 100 and the outer layer 200 are both made of foldable materials. The hanging support 400 includes a connecting part, which is connected to the top of the inner liner layer 100 and the top of the outer layer 200. The hanging support 400 is used to connect the outer layer 200 and the inner liner layer 100 to the box body 600.

[0039] The box body 600 serves as the supporting base of the atmospheric pressure air insulation structure, and the hanging support 400 is connected to the upper end of the box body 600, so that the atmospheric pressure air insulation structure can be easily unfolded, and the load borne by the liner layer 100 is applied to the supporting base of the external device through the hanging support 400, so that the pressure load of the article borne by the liner layer 100 and the tension of the hanging support 400 are in a balanced state, which is conducive to reducing the extrusion of the article on the air cavity 300, resulting in the deformation of the air cavity 300, and is conducive to increasing the insulation effect of the atmospheric pressure air insulation structure; the tension and pressure of the liner layer 100 are balanced, so that the inner wall of the liner layer 100 has a certain tension, which can offset the pressure of the article on the side wall of the liner layer 100 to maintain the shape of the air cavity 300. In addition, the air flows in the closed air cavity 300, which produces a certain shock damping effect on the shaking of the liner layer 100, so that the displacement of the liner layer 100 during transportation is small, thereby maintaining the insulation effect of the air insulation box.

[0040] It should be noted that the shape of the vent hole 330 can be various, such as square, round, long strip, etc., as long as the air can enter or exit the air cavity 300 through the vent hole 330.

[0041] The outer box 600 can protect the internal atmospheric pressure air insulation structure and absorb external impact during transportation. According to the size of the existing logistics box of the logistics company, the atmospheric pressure air insulation structure of suitable size can be customized and hung in the logistics box, so that the logistics box can be converted into an insulation box.

[0042] When in use, the normal pressure air insulation structure is suspended on the existing common box 600 through the suspension support 400, and the inner liner layer 100 and the air cavity 300 are unfolded. When unfolded, the space between the inner liner layer 100 and the outer layer 200 is expanded, and the external air can enter the air cavity 300 from the vents 330, and the air cavity 300 is used to provide insulation for the items in the inner liner layer 100. By controlling the size of the vents 330 of the air cavity 300, the flow of air in the air cavity 300 and the external air can be controlled when the air cavity 300 is in the insulation state, thereby maintaining the insulation effect of the normal pressure air insulation structure. The inner liner layer 100 forms an upwardly open storage cavity, which can be used to place items that need to be kept warm. The outer layer 200 covers the inner liner layer 100, and the upper end of the outer layer 200 is connected to the upper end of the inner liner layer 100. The outer layer 200 and the inner liner layer 100 form an air cavity 300 with ventilation holes 330, and the air cavity 300 can keep the items placed in the inner liner layer 100 warm.

[0043] When not in use, since the inner layer 100 and the outer layer 200 are both made of foldable materials, the suspension support 400 can be separated from the box body 600, the inner layer 100 and the outer layer 200 can be folded, and the air in the air cavity 300 can be squeezed out of the air cavity 300 through the vents 330, which is beneficial to reducing the space occupied by the normal-pressure air insulation structure, increasing the portability of the normal-pressure air insulation structure, and reducing the transportation cost of the insulation box using the normal-pressure air insulation structure.

[0044] It should be noted that the inner liner layer 100 and the outer layer 200 are both foldable and air-tight material parts, such as fiber, airtight cloth, rubber, etc. The material is thin and light. The normal pressure air insulation structure can be folded by the inner liner layer 100 and the outer layer 200, so that the normal pressure air insulation structure can be unfolded and folded, which is conducive to reducing the transportation cost of the insulation box using the normal pressure air insulation structure.

[0045] The box body 600 includes a cover plate, which is conducive to sealing the storage cavity of the liner layer 100, ensuring the insulation effect of the insulation box on the items contained in the storage cavity. The cover plate can be a conventional foam insulation material, or an airbag insulation structure can be used to achieve the insulation effect inside the box body 600. The box body 600 can be set as an existing box body 600 structure such as a turnover box, a logistics box or a frame, so as to achieve the suspension support effect on the liner layer 100.

[0046] Further preferably, the suspension support 400 may be in the shape of a cantilever beam, for example: the suspension support 400 includes a rod portion, and a connecting portion and a hanging portion are respectively provided at both ends of the rod portion, the connecting portion is connected to the top of the inner liner layer 100 and the outer envelope 200, and the hanging portion may be set to the shape of a hook, which is hung on the box body 600 through the hook, and through the supporting effect of the rod portion of the suspension support 400, the inner liner layer 100 and the air cavity 300 are unfolded, thereby realizing the connection between the normal pressure air insulation structure and the box body 600. The suspension support 400 may also be in the shape of a cable, for example: the suspension support 400 includes a connecting portion and a hanging portion, the connecting portion and the hanging portion are connected by a metal wire or a rope, the connecting portion is connected to the top of the inner liner layer 100 and the outer layer 200, the hanging portion can be set to a hook or the like, and is hung on the box body 600, and the inner liner layer 100 and the air cavity 300 are expanded by the tension of the metal wire or the rope, so as to realize the connection between the normal pressure air insulation structure and the box body 600

[0047] Further preferably, the outer layer 200 abuts against the inner side and inner bottom of the storage space. The number of the suspension support members 400 can be four, and the four suspension support members 400 have their hanging parts hung on the bottom shell, so that the liner layer 100 and the air cavity 300 are unfolded, and the outer layer 200 abuts against the inner side and inner bottom of the storage space, so as to reduce the movement of the normal pressure air insulation structure during transportation, thereby increasing the insulation effect of the air insulation box.

[0048] More preferably, a sealing member is further included, and the sealing member is arranged at the vent hole 330 , that is, the sealing member replaces the vent hole 330 , and the sealing member is used to open and close the air cavity 300 . Specifically, the sealing member is a one-way valve, which is arranged at the vent hole 330 and is used to open and close the air cavity 300. When the normal-pressure air insulation structure is not needed, the sealing member is opened and the inner liner layer 100 and the outer layer 200 can be folded. When folded, the air in the air cavity 300 is discharged through the sealing member, thereby reducing the space occupied by the normal-pressure air insulation structure; when the normal-pressure air insulation structure needs to be used, the hanging support member 400 is hung on the supporting base of the external device, and then the normal-pressure air insulation structure is unfolded, and the air enters the air cavity 300 from the sealing member. When the air fills the air cavity 300, the sealing member is closed to form a relatively closed air cavity 300, thereby reducing the heat exchange between the air in the air cavity 300 and the outside air, which is beneficial to increase the insulation effect of the normal-pressure air insulation structure.

[0049] Further preferably, two vents 330 are arranged on the air cavity 300, and there are also two sealing members, which are respectively an exhaust check valve and an air intake check valve, and the exhaust check valve and the air intake check valve are respectively arranged at the two vents 330. By using two check valves in different directions, the air cavity 300 and the external air can realize automatic flow when the normal pressure air insulation structure is unfolded and folded, and the air can be freely discharged or enter the air cavity 300 without manually controlling the valve, which is conducive to increasing the convenience of the user to use the normal pressure air insulation structure. When unfolded, air enters the air cavity 300 from the outside through the air intake check valve, and when folded, the air is discharged from the air cavity 300 to the outside. When the normal pressure air insulation structure is unfolded and in the insulation state, since the pressure inside the air cavity 300 is equivalent to that of the external air, the two check valves do not work, and the air in the air cavity 300 maintains a constant state and does not exchange with the external air, which is conducive to ensuring the insulation performance of the normal pressure air insulation structure.

[0050] Further preferably, the bottom surface of the outer layer 200 is located below the bottom surface of the inner liner layer 100, and the air cavity 300 includes a vertical cavity 310 and a horizontal cavity 320. The vertical cavity 310 is located between the inner circumferential surface of the outer layer 200 and the outer circumferential surface of the inner liner layer 100, and the horizontal cavity 320 is located between the inner bottom surface of the outer layer 200 and the outer bottom surface of the inner liner layer 100. The vertical cavity 310 and the horizontal cavity 320 are connected, which is beneficial to maintaining the thermal insulation effect of the inner liner layer 100.

[0051] According to the principle of heat transfer, heat transfer is divided into three situations: conduction, convection and radiation. In the air cavity 300, ignoring the radiation factor, the heat transfer in the air cavity 300 depends on conduction and convection. The air cavity 300 is divided into a vertical cavity 310 and a horizontal cavity 320. The air flow in the air cavity 300 is restricted, which belongs to the natural convection heat transfer in a limited space. The convection in the air cavity 300 mainly depends on the Gr number (Grasho f) with the thickness L of the air cavity 300 as the characteristic size. The formula is: From this, we can get L 3 =(Gr V 2 ) / (ga v Δt), where a v is the air expansion coefficient, Δt is the temperature gradient on both sides of the air barrier, and V is the kinematic viscosity of the air.

[0052] Further preferably, the atmospheric pressure air insulation structure further comprises an inner grille 500, which is arranged in the air cavity 300, and the air cavity 300 is divided into several layers of air interlayers from the inside to the outside by the inner grille 500, and through holes 510 are arranged between adjacent air interlayers. Preferably, the inner grille 500 is also arranged as a foldable and airtight material member, and the air cavity 300 is divided into several layers of air interlayers from the inside to the outside by the separation effect of the inner grille 500. Through holes 510 are arranged between the air interlayers, which is conducive to the gas flow between the air interlayers through the through holes 510 and the vents 330 of the air cavity 300, so that the air is discharged or enters the air interlayer. The thickness of each air interlayer is set to 0.008 to 0.026m.

[0053] The normal-pressure air insulation structure divides the air cavity 300 into several layers through the partitioning effect of the inner grille 500, thereby reducing the convection in the air cavity 300 by controlling the thickness of each air barrier layer, and relying on the layer-by-layer insulation effect of the multiple air barriers, which is beneficial to increasing the insulation effect of the normal-pressure air insulation structure.

[0054] The inner grille 500 divides the horizontal cavity 320 into several layers of sub-horizontal cavities, and the inner grille 500 divides the vertical cavity 310 into several layers of sub-vertical cavities. The thickness of each layer of sub-vertical cavity is L1, and the formula is satisfied: L1 3 =(Gr1V 2 ) / (ga vΔt1), where g is the acceleration due to gravity, a v is the volume change coefficient of air, Δt1 is the temperature difference on both sides of the sub-vertical cavity, Δt1 is set to 1 to 30°C, V is the kinematic viscosity of air, Gr is the Grashof number, and Gr1 of the sub-vertical cavity is ≤ 2860; the thickness of each layer of the sub-horizontal cavity is L2, and satisfies the formula: L2 3 =(Gr2V 2 ) / (ga v Δt2), where g is the acceleration due to gravity, a v is the volume change coefficient of air, Δt2 is the temperature difference on both sides of the sub-transverse cavity, Δt2 is set to 1 to 30°C, V is the kinematic viscosity of air, Gr is the Grashof number, and Gr2 of the sub-transverse cavity is ≤2430.

[0055] For the sub-vertical cavity, when Gr1≤2860, and for the sub-horizontal cavity, when Gr2≤2430, the heat transfer in the sub-vertical cavity and the sub-horizontal cavity depends on heat conduction. When the Gr value is greater than the above value, convection begins to form in the sub-vertical cavity and the sub-horizontal cavity. The larger the Gr value, the more intense the convection. According to the above formula, the thickness of the sub-horizontal cavity and the sub-vertical cavity and the number of parallel layers are selected to make Gr less than the above value, so that natural convection cannot be formed in the sub-horizontal cavity and the sub-vertical cavity, and the air cavity 300 has a better thermal insulation effect.

[0056] The formula determines the thickness of the air barrier according to the actual use situation. For example, the temperature of the outer side of the sub-vertical cavity is 30 degrees and the temperature of the inner side is 0 degrees, that is, Δt1 is 30 degrees, Gr1 is 2860, and a v The volume change coefficient is set to 0.0035, and the kinematic viscosity of air is 0.0000148m^2 / s at 20 degrees atmospheric pressure. The thickness of the sub-vertical cavity can be calculated to be about 0.0085m; if the temperature of the outer side of the sub-vertical cavity is 30 degrees and the temperature of the inner side is 31 degrees, that is, Δt1 is 1 degree, Gr1 is 2860, a v The volume change coefficient is set to 0.0035, and the kinematic viscosity of air is taken as 0.0000148m^2 / s at 20 degrees atmospheric pressure. It can be calculated that the thickness of the sub-vertical cavity is about 0.026m;

[0057] If the temperature of the outer side of the sub-transverse cavity is 30 degrees and the temperature of the inner side is 0 degrees, that is, Δt2 is 30 degrees, Gr2 is 2430, a v The volume change coefficient is set to 0.0035, and the kinematic viscosity of air is 0.0000148m^2 / s at 20 degrees atmospheric pressure. The thickness of the sub-cavity can be calculated to be about 0.008m; if the temperature of the outer side of the sub-cavity is 30 degrees and the temperature of the inner side is 31 degrees, that is, Δt2 is 1 degree, Gr2 is 2430, a vThe volume change coefficient is set to 0.0035, and the kinematic viscosity of air is taken as 0.0000148m^2 / s at 20 degrees atmospheric pressure. It can be calculated that the thickness of the sub-transverse cavity is about 0.025m;

[0058] If the outside temperature of the air cavity 300 is 30 degrees and the inside temperature is 0 degrees, the total temperature difference is 30 degrees, then the total Δt = 30 degrees. If the inner grille 500 is set with 2 layers, then 3 layers of air insulation are set in the insulation box, and the average temperature difference of each layer is Δt = 10 degrees. v The volume change coefficient is set to be 0.0035, the kinematic viscosity of air is taken as 0.0000148m^2 / s, the kinematic viscosity of dry air at 20 degrees atmospheric pressure, Gr1 is 2860, and Gr2 is 2430. The sub-vertical cavity thickness L1 of the single-layer air barrier is approximately 0.012m, and the sub-horizontal cavity thickness L2 is approximately 0.011m, which is consistent with the air barrier thickness range of 0.008 to 0.026m.

[0059] Further preferably, the inner grille 500 includes two layers, and the two layers of inner grilles 500 divide the air cavity 300 from the inside to the outside into three layers of air interlayers. By controlling the thickness of each layer of air interlayer, the heat preservation effect of each layer of air interlayer is controlled, and the items in the liner are insulated layer by layer through the three layers of air interlayers arranged from the inside to the outside. The normal pressure air insulation structure is arranged in three layers, which can effectively control the volume of the air cavity 300 after being filled with air, and control the space size of the normal pressure air insulation structure after being folded, which is conducive to maintaining the portability of the normal pressure air insulation structure. There are two through holes 510, and flow limiting valves are arranged in both through holes 510. Specifically, the flow limiting valves can be exhaust check valves and air intake check valves. Exhaust check valves and air intake check valves are respectively arranged in the two through holes 510. The arrangement of the exhaust check valve and the air intake check valve is conducive to controlling the air flow between two adjacent air interlayers, and is conducive to maintaining the heat preservation effect of each air interlayer.

[0060] Further preferably, the atmospheric pressure air insulation structure also includes a support plate, which is arranged in the storage cavity, and the support plate is against the inner bottom surface of the liner layer 100. The support plate supports the items placed in the storage cavity of the liner layer 100. When the items are placed in the storage cavity, the bottom surface of the liner layer 100 is not easily deformed to a large extent, so that the shape of the bottom air cavity 300 is more stable, which is conducive to increasing the practicality of the atmospheric pressure air insulation structure. Specifically, the support plate can be set as a frame or a hard plate. The support plate can also be set as an insulation plate, which is set in the storage cavity so that the insulation plate is subjected to a certain pressure to reduce the stress on the liner layer 100.

[0061] Further preferably, a bottom support is also included, the outer layer 200 covers the outer surface of the inner liner layer 100, and the bottom support is connected to the lower end of the inner liner layer 100 and the lower end of the outer layer 200. For example, the bottom support can be set as a whole foam board, and the foam board is connected to the lower end of the inner liner layer 100 and the lower end of the outer layer 200, that is, the bottom support is used as the base of the air insulation box, thereby replacing the insulation performance of the transverse cavity 320, which is conducive to strengthening the support of the bottom of the air insulation box, thereby reducing the risk of damage caused by excessive pressure on the bottom surface of the inner liner layer 100. For another example, the bottom support can be set to have an insulation board to strengthen the support of the air insulation box.

[0062] Further preferably, it also includes a side wall support member, and the side wall support member is foldably connected as a whole, such as the side wall support member can be set to an upper and lower section, and the upper and lower sections are rotatably connected, so as to achieve folding. The side wall support member is connected to the side wall of the liner layer 100, and is used to support the items placed in the storage cavity of the liner layer 100, which is conducive to reducing the shaking of the items contained in the storage cavity, and the collision of the items with the side wall of the liner layer 100, resulting in the shape of the air cavity 300 changing, affecting the insulation effect of the normal pressure air insulation structure, which is conducive to increasing the practicality of the normal pressure air insulation structure.

[0063] Embodiment 2, in order to further improve the portability of the incubator, this embodiment provides an incubator, which has the same atmospheric pressure air insulation structure as that of embodiment 1, except that the box body 600 of this embodiment is a foldable box body 600, as disclosed in the "foldable incubator and folding method thereof" with application number: CN202010917638.7, which discloses "a foldable incubator comprising six baffle plates for assembling six faces of a rectangular parallelepiped, and in an assembled state, the bottom face of the incubator is foldable. The baffle is supported under the four side baffles, and the top baffle covers the four side baffles. When folded, the bottom baffle is at the bottom, the inner surface of the rear baffle faces down and is pressed on the bottom baffle. The left and right baffles are stacked together with their outer surfaces facing down and pressed against the rear baffle. The outer surface of the top baffle faces down and is pressed against the left or right baffle. The inner surface of the front baffle faces down and presses against the top baffle. The canvas bag is directly sewn from canvas material. The production process requirements are low, so the production cost of the foldable thermal insulation box is greatly reduced. After disassembling the thermal insulation box, the six baffles can be stacked together vertically layer by layer, which minimizes the occupied volume of the thermal insulation box in the folded state and saves transportation costs. ", For example, the application number is: CN201920316395.4, "A foldable integrated multi-zone cold storage thermal insulation box, disclosed in "A foldable integrated multi-zone cold storage thermal insulation box, including: a thermal insulation box body, a box cover; wherein the thermal insulation box body includes a front plate, a rear plate, at least two side plates, a top plate and a bottom plate, and the inner side surfaces of the upper and lower ends of the front plate, the rear plate, and at least two side plates are respectively provided with a first groove and a second groove, and the inner side surfaces of the front plate and the rear plate are provided with at least two third grooves in the vertical direction, and the side plates include a first plate and a second plate, and the cross-sections of the first plate and the second plate are both in the shape of a right-angled trapezoid, and the first plate and the second plate are combined to form a rectangular plate-like structure. The cold storage and heat preservation box of the present invention can be folded and placed, which not only reduces the occupied space, but also facilitates transportation and carrying. The upper and lower bottom plates are completely free, and the two side panels enable the heat preservation box to avoid the infiltration of external air and the loss of internal cold as much as possible when it is opened. "

[0064] Since the box body 600 of the present embodiment is foldably connected as a whole, during the return process of the air insulation box after completing the transportation of goods, the built-in normal pressure air insulation structure and the box body 600 can be compressed and folded at the same time, thereby greatly reducing the space occupied by the air insulation box when not in use, which is beneficial to reducing transportation costs and reducing the pollution to the environment caused by the use of white foam boxes.

[0065] Of course, since the foldable box body 600 structure has been widely used in the field of thermal insulation boxes, the box body 600 of the present invention is not limited to the above-mentioned foldable structure.

[0066] The preferred embodiments of the present invention are specifically described above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A normal pressure air insulation structure, characterized in that ,include: An inner liner layer, wherein the inner liner layer forms an upwardly open storage cavity; An outer layer, the outer layer covers the inner layer, the upper end of the outer layer is connected to the upper end of the inner layer, an air cavity with vents is formed between the outer layer and the inner layer, and the inner layer and the outer layer are both made of foldable materials; A hanging support, wherein the hanging support comprises a connecting portion, wherein the connecting portion is connected to the top of the inner liner layer and the top of the outer cladding layer; the hanging support is used to connect the inner liner layer and the outer cladding layer to a supporting substrate of an external device, so that the load borne by the inner liner layer acts on the supporting substrate of the external device through the hanging support, thereby unfolding the atmospheric pressure air insulation structure; An inner grille, the inner grille being arranged in the air cavity, and the inner grille dividing the air cavity into a plurality of air partition layers from the inside to the outside; The side wall support member is foldably connected as a whole, and the side wall support member is connected to the side wall of the liner layer.

2. The atmospheric pressure air insulation structure according to claim 1 is characterized in that , also includes a sealing member, which is arranged at the vent hole and is used to open and close the air cavity.

3. The atmospheric pressure air insulation structure according to claim 2 is characterized in that The air cavity is provided with two vents, and the sealing member includes an exhaust one-way valve and an intake one-way valve, and the exhaust one-way valve and the intake one-way valve are respectively arranged at the two vents.

4. The atmospheric pressure air insulation structure according to any one of claims 1 to 3, characterized in that The inner bottom surface of the outer covering layer is located below the outer bottom surface of the inner liner layer, the air cavity includes a vertical cavity and a horizontal cavity, the vertical cavity is located between the inner peripheral surface of the outer covering layer and the outer peripheral surface of the inner liner layer, the horizontal cavity is located between the inner bottom surface of the outer covering layer and the outer bottom surface of the inner liner layer, and through holes are arranged between adjacent air interlayers; the thickness of each layer of the air interlayer is set to 0.008 to 0.026m.

5. The atmospheric pressure air insulation structure according to claim 4, characterized in that The inner grille divides the horizontal cavity into several layers of sub-horizontal cavities, and the inner grille divides the vertical cavity into several layers of sub-vertical cavities. The thickness of each layer of the sub-vertical cavity is , and satisfy the formula: , where g is the acceleration due to gravity, is the volume variation coefficient of air, is the temperature difference on both sides of the sub-vertical cavity, is set to 1 to 30°C, V is the kinematic viscosity of air, Gr is the Grashof number, and the sub-chamber ≤2860; the thickness of each sub-transverse cavity is , and satisfy the formula: , where g is the acceleration due to gravity, is the volume variation coefficient of air, is the temperature difference on both sides of the sub-transverse cavity, is set to 1 to 30°C, V is the kinematic viscosity of air, Gr is the Grashof number, and the sub-transverse cavity ≤2430.

6. The atmospheric pressure air insulation structure according to claim 1, characterized in that , also includes a support plate, which is arranged in the storage cavity and abuts against the inner bottom surface of the liner layer.

7. The atmospheric pressure air insulation structure according to claim 1, characterized in that , also includes a bottom support member, the outer layer covers the outer surface of the inner layer, and the bottom support members are connected to the lower end of the outer layer and the lower end of the inner layer.

8. An air insulation box, characterized in that: include: A box body, wherein a storage space is formed inside the box body ； The normal-pressure air insulation structure according to any one of claims 1 to 7, wherein the normal-pressure air insulation structure is arranged in the storage space, and the suspension support is connected to the box body.

9. The air insulation box according to claim 8, characterized in that The box body includes a cover plate and a bottom shell, the bottom shell is foldably connected as a whole, and the hanging support is connected to the upper end of the bottom shell.

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