Vacuum insulated panel

Abstract

The utility model discloses a vacuum insulated panel, including honeycomb core, fibrofelt, getter and barrier membrane, honeycomb fibrofelt sandwich structure is formed by respectively setting the fibrofelt on the both sides of honeycomb core thickness direction, and the barrier membrane is set up around honeycomb fibrofelt sandwich structure and wraps it, and getter is set up between fibrofelt and barrier membrane. The vacuum insulated panel disclosed by the utility model is simple in structure, the vacuum insulated panel can be formed only by attaching the fiber felts to the two sides of the honeycomb core in the thickness direction, placing the getter on the surfaces of the fiber felts, wrapping the sandwich structure of the honeycomb fiber felts through the barrier film and vacuumizing, and the vacuum insulated panel is simple in preparation process, low in cost and high in practicability. The complexity of the preparation process of the vacuum insulation panel can be reduced; the density of the honeycomb core is far lower than that of the fiber felt, so that the weight reduction effect is achieved, and the weight reduction effect is achieved compared with the whole use of the fiber felt; the honeycomb core and the fiber felt are used as porous materials, so that the heat conductivity coefficient can be reduced, and excellent heat insulation performance is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of thermal insulation materials, more particularly to a vacuum insulation board. BACKGROUND

[0002] The vacuum insulation board is mainly composed of a core material, a barrier film and a getter, and is a new generation of high-performance thermal insulation material obtained by reducing pressure and vacuumizing. The vacuum insulation board has been widely used in the thermal insulation field of various industries due to its good heat insulation performance, and the fields with high usage include refrigerators, freezers, thermal insulation boxes, medical product delivery, containers, low-temperature transportation and building industries.

[0003] The core material in the vacuum insulation board is one of the main components of the vacuum insulation board, which is generally made of porous medium material processed by a special process. Common core materials mainly include particle core material, foam core material, fiber core material and composite core material. The functions of the core material mainly include three aspects: first, structural support to prevent the vacuum insulation board from shrinking and collapsing under the condition of internal vacuum; second, prevention of heat radiation; and third, reduction of heat conduction. Since the core material is a porous substance with a small contact area, it can effectively reduce heat transfer caused by heat conduction.

[0004] The patent with publication number CN109665862 A proposes a vacuum insulation board including a honeycomb structure material, an embedded material, an embedded vacuum insulation board, a high-barrier film bag and a getter. The vacuum insulation board needs to be filled with the embedded material in the honeycomb structure material and then cured at high temperature before being combined with the high-barrier film bag. The process is complex, the process flow is long, and the process cost and material cost are high.

[0005] Therefore, how to reduce the complexity of the preparation process of the vacuum insulation board while ensuring excellent heat insulation performance and lightweight effect has become a technical problem to be solved by the technical personnel in the field. UTILITY MODEL CONTENTS

[0006] Therefore, the purpose of the utility model is to provide a vacuum insulation board that reduces the complexity of the preparation process of the vacuum insulation board while ensuring excellent heat insulation performance and lightweight effect.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A vacuum insulation board includes a honeycomb core, a fiber felt, a getter and a barrier film. The two sides of the honeycomb core in the thickness direction are respectively provided with fiber felts to form a honeycomb fiber felt sandwich structure. The barrier film is arranged around the honeycomb fiber felt sandwich structure and wraps it. The getter is arranged between the fiber felt and the barrier film.

[0009] Optionally, in the vacuum insulation board, the getter is arranged between the barrier film and the at least one fiber felt.

[0010] Optionally, in the vacuum insulation board, the honeycomb holes of the honeycomb core are arranged in an array structure, and the shape of the honeycomb holes comprises at least one of a polygon and a circle.

[0011] Optionally, in the vacuum insulation board, the density of the honeycomb core ranges from 29kg / m 3 -144kg / m 3 , and the side length of the honeycomb hole is 1.83mm-9.6mm.

[0012] Optionally, in the vacuum insulation board, the shape of the honeycomb core is one of a circle, a polygon, a wedge, or a special shape.

[0013] Optionally, in the vacuum insulation board, the shape of the fiber felt is the same as that of the honeycomb core, and the size of the fiber felt is larger than that of the honeycomb core.

[0014] Optionally, in the vacuum insulation board, the material of the honeycomb core is one of an organic polymer material, an inorganic non-metal material, or a metal material.

[0015] Optionally, in the vacuum insulation board, the material of the fiber felt is one of a glass fiber felt, a ceramic fiber felt, or an aerogel felt.

[0016] Optionally, in the vacuum insulation board, the getter comprises at least one of a desiccant getter, an oxide getter, and a metal getter.

[0017] Optionally, in the vacuum insulation board, the barrier film comprises a base film and a plurality of polymer material thin films.

[0018] As can be seen from the above, the vacuum insulation board disclosed by the utility model has a simple structure, only needs to paste the fiber felt on the two sides of the honeycomb core arranged oppositely, place the getter on the surface of the fiber felt, wrap the honeycomb fiber felt sandwich structure through the barrier film, and can form the vacuum insulation board through vacuumizing, so that the preparation process is simple, the cost is low, and the complexity of the preparation process of the vacuum insulation board can be reduced; at the same time, the density of the honeycomb core is far lower than that of the fiber felt, so that the effect of weight reduction is achieved, the overall thickness of the vacuum insulation board is thicker, the thickness of the honeycomb core is thicker, and the effect of weight reduction is more obvious; compared with using the fiber felt entirely, the honeycomb core and the fiber felt have the effect of light weight; the contact area of the honeycomb core and the fiber felt is small, so that the heat effect caused by heat conduction can be reduced; the honeycomb core and the fiber felt are porous materials, so that the thermal conductivity coefficient can be reduced, and excellent heat insulation performance is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the honeycomb fiber felt sandwich structure disclosed in the embodiments of this utility model;

[0021] Figure 2 This is a schematic diagram of the molding process of the honeycomb fiber felt sandwich structure disclosed in the embodiments of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the vacuum insulation panel disclosed in the embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the honeycomb core structure disclosed in an embodiment of the present utility model.

[0024] Among them, 10 is the honeycomb core, 20 is the fiber felt, 30 is the air absorbent, and 40 is the barrier membrane. Detailed Implementation

[0025] The core of this utility model lies in disclosing a vacuum insulation panel that reduces the complexity of the manufacturing process of the vacuum insulation panel while ensuring excellent insulation performance and lightweight effect.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 3 As shown in the figure, this utility model embodiment discloses a vacuum insulation panel, including a honeycomb core 10, a fiber felt 20, a getter 30, and a barrier film 40.

[0028] In this structure, fiber felt 20 is disposed on both sides of the honeycomb core 10 in the thickness direction. The fiber felt 20 is preferably inorganic fiber felt, forming a honeycomb fiber felt sandwich structure. A barrier membrane 40 is disposed around the honeycomb fiber felt sandwich structure and wraps around it. A getter 30 is disposed between the fiber felt 20 and the barrier membrane 40. The fiber felt 20 can play a role in balancing pressure and preventing the edges of the honeycomb core 10 from collapsing. Figure 1As shown, the two sides of the honeycomb core 10 that are opposite each other refer to the two sides facing the honeycomb holes.

[0029] During manufacturing, a vacuum insulation panel is prepared using a vacuum filtration method. The panel is constructed by sequentially forming a honeycomb fiber felt sandwich structure consisting of fiber felt 20, honeycomb core 10, and fiber felt 20. Then, getter 30 is placed on the honeycomb fiber felt sandwich structure. Finally, the entire structure is wrapped with a barrier membrane 40. The air in the barrier membrane 40 is extracted using a vacuum filtration method to achieve a pressure of at least one atmosphere. The barrier membrane 40 is then sealed, preferably by heat fusion sealing, to obtain the vacuum insulation panel.

[0030] The specific manufacturing steps are as follows: The barrier film 40 is made into an open barrier bag according to the shape of the honeycomb core 10; the fiber felt 20 is cut into a shape consistent with the honeycomb core 10; the fiber felt 20 and the honeycomb core 10 are placed in an oven and dried at 80℃ for 2 hours; after removing the fiber felt 20 and the honeycomb core 10, they are then processed sequentially... Figure 1 The structure shown is laid out, and the fiber felt 20 and the honeycomb core 10 do not need to be connected, which simplifies the process; the getter 30 is placed on the surface of the fiber felt 20; the prepared structure is placed in a barrier bag; the barrier bag is placed in a vacuum equipment and vacuumed; after vacuuming, the opening of the barrier bag is sealed to form a vacuum insulation board, preferably by heat sealing. Figure 2 The diagram shown is a schematic of the formation of a honeycomb fiber felt sandwich structure.

[0031] The honeycomb core 10 has excellent specific strength and specific modulus, which can improve the rigidity of the overall structure with a small increase in weight, and can resist earthquakes, impacts and fatigue. At the same time, the honeycomb core 10 has high porosity, and the air in the honeycomb cells can be completely extracted to maintain a good vacuum state.

[0032] The vacuum insulation panel disclosed in this embodiment has a simple structure. It only requires laying fiber felt 20 on the opposite sides of the honeycomb core 10 to form a honeycomb fiber felt sandwich structure. The getter 30 is placed on the surface of the fiber felt 20, and the honeycomb fiber felt sandwich structure is wrapped by the barrier film 40. The vacuum insulation panel is formed by vacuuming. The manufacturing process is simple and low-cost, which can reduce the complexity of the vacuum insulation panel manufacturing process. At the same time, since the density of the honeycomb core 10 is much lower than that of the fiber felt 20, it has a weight reduction effect. The thicker the overall thickness of the vacuum insulation panel, the thicker the honeycomb core 10, and the more obvious the weight reduction effect. Compared with using fiber felt all the way, it has a lightweight effect. The small contact area between the honeycomb core 10 and the fiber felt 20 can reduce the thermal effect caused by heat conduction. As porous materials, the honeycomb core 10 and the fiber felt 20 can reduce the thermal conductivity and have excellent thermal insulation performance.

[0033] Furthermore, the getter 30 is disposed between the barrier membrane 40 and at least one fiber felt 20, preferably between two fiber felts 20 and the barrier membrane 40, that is, the getter 30 is disposed on both sides of the honeycomb fiber felt sandwich structure to absorb air in the honeycomb core 10, form a vacuum state, reduce heat conduction and convection, thereby achieving a good heat insulation effect.

[0034] Furthermore, the honeycomb cells of the honeycomb core 10 are arranged in an array structure, and the shape of the honeycomb cells includes at least one of polygons and circles. The polygons can be rectangles, pentagons, hexagons, etc. The shape of the honeycomb cells is preferably hexagonal, and the side length of each honeycomb cell is preferably the same. Multiple consecutive honeycomb cells are combined to form the honeycomb core 10, and the density of the honeycomb core 10 is in the range of 29 kg / m³. 3 -144kg / m 3 The side length of the honeycomb cells ranges from 1.83mm to 9.6mm. The standard side lengths of the honeycomb cells include the following values: 1.83mm, 2.75mm, 3mm, 3.67mm, 4mm, 5.5mm, and 9.6mm. Different side lengths and densities of the honeycomb cells can be selected according to the compressive strength requirements of the product.

[0035] Furthermore, the shape of the honeycomb core 10 can be one of the following: circular, polygonal (such as triangle, rectangle, pentagon, hexagon, etc.), wedge-shaped, or irregular. Figure 2 The honeycomb core 10 shown is rectangular in shape. Figure 4 The honeycomb core 10 shown is conical in shape and has a three-dimensional structure. Furthermore, the shape of the fiber felt 20 is preferably the same as that of the honeycomb core 10, such as... Figure 1 As shown in the figure, both the honeycomb core 10 and the fiber felt 20 are rectangular in shape. The size of the fiber felt 20 is larger than that of the honeycomb core 10. Preferably, the side length of the fiber felt 20 is at least 3 mm longer than the corresponding side length of the honeycomb core 10. During the vacuuming process, the fiber felt 20 can protect the edges of the honeycomb core 10 from collapsing. The shape of the prepared vacuum insulation board can be circular, polygonal, hollow circular, wedge-shaped, etc., which can be determined according to actual needs.

[0036] Furthermore, the honeycomb core 10 is made of one of the following materials: organic polymer, inorganic non-metallic, or metallic. Organic polymers include aramid, inorganic non-metallic materials include glass cloth, ceramic, wood, and carbon fiber, and metallic materials include aluminum alloy and stainless steel.

[0037] Furthermore, the fiber felt 20 is made of one of glass fiber felt, ceramic fiber felt or aerogel felt. Among them, aerogel felt is a thermal insulation felt made of nano-silica or metal aerogel as the main material and composited with carbon fiber or ceramic glass fiber cotton or pre-oxidized fiber felt through a special process. It has a low thermal conductivity of 0.02W / (m·K)-0.03W / (m·K).

[0038] Furthermore, the getter 30 includes at least one of the following: desiccant-type getters, oxide-type getters, and metal-type getters. That is, getter 30 can be one of these three types, or a combination of multiple types, meaning that part of getter 30 is a desiccant-type getter, and another part is one or more of oxide-type or metal-type getters. Desiccant-type getters include CaO, MgCl2, etc.; oxide-type getters include CuO, etc.; and metal-type getters include barium-lithium alloy getters, etc., capable of absorbing nitrogen, oxygen, and hydrogen. Getter 30 can adsorb gases generated by external permeation or internal material release from the vacuum insulation panel, ensuring a better vacuum level within the vacuum insulation panel, maintaining its insulation performance, and extending its service life.

[0039] The barrier membrane 40 comprises a base membrane and multiple layers of polymer material films, typically including a protective layer, a water vapor barrier layer, a gas barrier layer, a radiation shielding layer, and a heat-sealing layer. It serves to encapsulate, isolate, and prevent permeation. On one hand, it wraps the honeycomb fiber felt sandwich structure to isolate it from external air and maintain a vacuum inside. On the other hand, the barrier membrane 40 itself is a dense material, effectively preventing nitrogen, oxygen, and water vapor from penetrating into the vacuum insulation panel. Furthermore, the barrier membrane 40 also reduces heat conduction and heat radiation.

[0040] The following are the specific parameters of the various components of a vacuum insulation panel, as detailed in the table below. The thermal conductivity of the vacuum insulation panels shown in the table is between 0.009 W / (m·K) and 0.034 W / (m·K), which is relatively low and indicates good thermal insulation performance.

[0041]

[0042]

[0043] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0044] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

[0045] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of the different embodiments or examples, without contradiction.

Claims

1. A vacuum insulation panel, characterized in that, The device includes a honeycomb core (10), a fiber felt (20), a getter (30), and a barrier film (40). The fiber felt (20) is disposed on both sides of the honeycomb core (10) in the thickness direction to form a honeycomb fiber felt sandwich structure. The barrier film (40) is disposed around the honeycomb fiber felt sandwich structure and wraps it. The getter (30) is disposed between the fiber felt (20) and the barrier film (40).

2. The vacuum insulation panel as described in claim 1, characterized in that, The getter (30) is disposed between the barrier membrane (40) and at least one of the fiber felts (20).

3. The vacuum insulation panel as described in claim 1, characterized in that, The honeycomb core (10) has honeycomb holes arranged in an array structure, and the shape of the honeycomb holes includes at least one of polygons and circles.

4. The vacuum insulation panel as described in claim 3, characterized in that, The density range of the honeycomb core (10) is 29 kg / m³. 3 -144kg / m 3 The side length of the honeycomb holes is 1.83mm-9.6mm.

5. The vacuum insulation panel as described in claim 1, characterized in that, The honeycomb core (10) is in the shape of a circle, a polygon, a wedge, or an irregular shape.

6. The vacuum insulation panel as described in claim 5, characterized in that, The shape of the fiber felt (20) is the same as that of the honeycomb core (10), and the size of the fiber felt (20) is larger than that of the honeycomb core (10).

7. The vacuum insulation panel according to any one of claims 1-6, characterized in that, The honeycomb core (10) is made of one of the following materials: organic polymer, inorganic non-metallic, or metallic.

8. The vacuum insulation panel as described in claim 7, characterized in that, The fiber felt (20) is made of one of glass fiber felt, ceramic fiber felt or aerogel felt.

9. The vacuum insulation panel as described in claim 7, characterized in that, The getter (30) includes at least one of the following: desiccant getter, oxide getter, and metal getter.

10. The vacuum insulation panel as described in claim 7, characterized in that, The barrier film (40) includes a base film and a multilayer polymer film.

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