A metal vacuum insulated panel packaging method and a metal vacuum insulated panel

Abstract

The application discloses a metal vacuum heat insulation plate packaging method, which comprises the following steps: step one, placing a plate body arranged under the atmosphere into a vacuum chamber; wherein the plate body comprises an upper barrier piece, a lower barrier piece, a core material, an adsorbent and heat sealing glue; step two, performing vacuumizing on the plate body in the vacuum chamber; step three, performing pressure heating on the upper barrier piece and / or the lower barrier piece in the vacuum chamber, so that the heat sealing glue between the upper barrier piece and the lower barrier piece is melted, and the upper barrier piece and the lower barrier piece are glued together; step four, breaking the vacuum, and taking out the vacuum heat insulation plate prepared in the vacuum chamber; and step five, welding and packaging the edge of the vacuum heat insulation plate under the atmospheric pressure. The application further discloses a metal vacuum heat insulation plate. The application performs air extraction in the vacuum chamber, has high air extraction efficiency, then performs pre-sealing, and finally performs welding and packaging under the atmospheric pressure, so that an air extraction hole is not needed to be arranged, the sealing effect is good, the efficiency is higher, and air leakage is not easy.

Description

Technical Field

[0001] This invention relates to the field of vacuum insulation panel technology, and particularly to a method for packaging a metal vacuum insulation panel and a metal vacuum insulation panel. Background Technology

[0002] Vacuum insulation panels are a new type of thermal insulation material, composed of a core filling material and a vacuum-protected surface layer. They are currently the world's most advanced and efficient thermal insulation material. The main advantages of vacuum insulation panels are excellent thermal insulation performance, thinness, and light weight. They effectively prevent heat transfer caused by air convection, thus significantly reducing the thermal conductivity and exhibiting energy-saving and environmentally friendly characteristics.

[0003] To improve the heat resistance of vacuum insulation panels, some metal vacuum insulation panels have been disclosed in the prior art. The preparation method of the metal vacuum insulation panels in the prior art is usually as follows: after being sealed under atmospheric pressure, an air extraction hole is set on the barrier film, and then an air extraction device is used to extract air from the inside of the panel through the air extraction hole. Finally, the air extraction hole is sealed to obtain the metal vacuum insulation panel. Its drawbacks are: low air extraction efficiency, difficulty in obtaining a good vacuum degree inside the panel, and the sealing effect of the air extraction hole after sealing is not good enough, so that the sealed position of the air extraction hole is prone to air leakage during long-term use of the metal vacuum insulation panel. Summary of the Invention

[0004] Based on the aforementioned problems in the existing technology, the purpose of this application is to provide a method for encapsulating a metal vacuum insulation panel. This method involves evacuating air from a vacuum chamber, which is highly efficient, followed by pre-sealing, and finally welding and encapsulating the panel under atmospheric pressure. This eliminates the need for evacuation holes, resulting in a good sealing effect and reduced leakage.

[0005] The second objective of this application is to provide a metal vacuum insulation panel.

[0006] The technical solution adopted by this application to solve its technical problem is: a method for encapsulating a metal vacuum insulation panel, comprising the following steps:

[0007] Step 1: Place the plate, which has been prepared under atmospheric conditions, into a vacuum chamber; wherein the plate includes an upper barrier, a lower barrier, a core material, an adsorbent, and a heat sealant. The core material and the adsorbent are located between the upper barrier and the lower barrier, and the heat sealant is located at the edge sealing position of the upper barrier and the lower barrier, and an air extraction channel is formed between the heat sealant and the upper barrier and the lower barrier.

[0008] Step 2: Vacuum the plate in the vacuum chamber, and the gas in the core material is drawn to the outside through the vacuum channel.

[0009] Step 3: Pressurize and heat the upper barrier and / or lower barrier in the vacuum chamber to melt the heat-sealing adhesive between the upper barrier and the lower barrier, thereby sealing the upper barrier and the lower barrier together.

[0010] Step 4: Break the vacuum and remove the vacuum insulation panel made inside the vacuum chamber;

[0011] Step 5: Under atmospheric pressure, weld and seal the adhesive-sealed area of ​​the vacuum insulation panel.

[0012] Furthermore, in step five, the sealing area of ​​the vacuum insulation board is welded and encapsulated to form a closed weld ring; it also includes step six, which is to trim and trim the sealing area located outside the weld ring.

[0013] Furthermore, the heat-sealing adhesive is ring-shaped, and after melting, it is heat-sealed together with the upper and lower barrier components to form a sealing area; the welding ring is located inside the sealing area.

[0014] Furthermore, the upper barrier is an upper metal barrier film made of stainless steel foil or alloy material, and the lower barrier is a lower metal barrier film made of stainless steel foil or alloy material.

[0015] Furthermore, the upper barrier is a metal barrier film made of stainless steel foil or alloy material, and the lower barrier is a barrier bottom shell formed by stamping stainless steel foil or alloy material.

[0016] Furthermore, the core material is made of one or more of the following materials: centrifugal cotton, basalt, gas silica, and high silica glass fiber.

[0017] Furthermore, the adsorbent is made of one or more materials such as barium-lithium alloy, cobalt oxide, vanadium, zirconium, and iron.

[0018] Furthermore, the heat-sealing adhesive is an EVA, PES, PE, PA, SBS, or EAA hot melt adhesive.

[0019] Furthermore, the heat-sealing adhesive is made by dispensing EVA or PES hot melt adhesive. The PES heat-sealing adhesive or EVA heat-sealing adhesive is applied to the edge of the lower barrier component using a ring-shaped dispensing method.

[0020] Furthermore, in step two, the plate is evacuated in the vacuum chamber, and the vacuum level in the vacuum chamber is 0.01 Pa to 50 Pa.

[0021] Furthermore, in step three, the heat-sealing temperature of the heat-sealing adhesive made of EVA material is 50℃-150℃, and the heat-sealing time is 60S-120S; the heat-sealing temperature of the heat-sealing adhesive made of PES material is 110℃-210℃, and the heat-sealing time is 60S-120S.

[0022] Furthermore, the heat sealant is a hot melt adhesive film, which is fixed to the lower barrier component using double-sided adhesive.

[0023] Furthermore, in step five, the welding and encapsulation method is laser welding or resistance welding.

[0024] Furthermore, in step five, the edges of the vacuum insulation panel are encapsulated by laser welding, and the peel strength of the vacuum insulation panel after laser welding is 20N / mm-60N / mm.

[0025] Furthermore, the surfaces of the upper barrier and / or lower barrier are coated with an insulating coating.

[0026] The technical solution adopted by this application to solve its technical problem is: a metal vacuum insulation plate, which is made by the above-mentioned encapsulation method.

[0027] The beneficial effects of this application are as follows: After the panel is prepared, it is placed in a vacuum chamber and evacuated. Because an air extraction channel is formed between the heat-sealing adhesive and the upper and lower barrier components, it facilitates the extraction of gas from the core material. After reaching a predetermined vacuum level, the upper and / or lower barrier components are pressurized and heated within the vacuum chamber, causing the heat-sealing adhesive to melt. After melting, the upper and lower barrier components are heat-sealed together, achieving pre-sealing. However, in high-temperature environments, the heat-sealing adhesive in the pre-sealed metal vacuum insulation panel will remelt, leading to air leakage. To address this issue, the pre-sealed metal vacuum insulation panel is laser-welded at room temperature. Laser welding firmly connects the upper and lower barrier components, making the metal vacuum insulation panel less prone to leakage in high-temperature environments. Therefore, the present invention pre-seales and then performs laser welding encapsulation at room temperature under atmospheric conditions, resulting in a strong and reliable seal and good airtightness for the metal vacuum insulation panel. Attached Figure Description

[0028] Figure 1 This is an exploded view of the metal vacuum insulation panel in this application;

[0029] Figure 2 This is an exploded view of a metal vacuum insulation panel according to another embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the metal vacuum insulation panel in this application.

[0031] Explanation of reference numerals in the attached figures

[0032] Upper barrier 1, lower barrier 2, core material 3, adsorbent 4, heat sealant 5, welding ring 6. Detailed Implementation

[0033] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 3 As shown, a metal vacuum insulation panel encapsulation method of the present invention includes the following steps:

[0035] Step 1: Place the prepared plate in a vacuum chamber. The plate includes an upper barrier 1, a lower barrier 2, a core material 3, an adsorbent 4, and a heat sealant 5. The core material 3 and the adsorbent 4 are located between the upper barrier 1 and the lower barrier 2. The heat sealant 5 is located at the edge sealing position of the upper barrier 1 and the lower barrier 2, and an air extraction channel is formed between the heat sealant 5 and the upper barrier 1 and the lower barrier 2. Step 2: Evacuate the plate in the vacuum chamber, and the gas in the core material 3 is extracted to the outside through the air extraction channel. Step 3: Pressurize and heat the upper barrier 1 and / or the lower barrier 2 in the vacuum chamber to melt the heat sealant 5 located between the upper barrier 1 and the lower barrier 2, thereby sealing the upper barrier 1 and the lower barrier 2 together. Step 4: Break the vacuum and remove the vacuum insulation plate made in the vacuum chamber. Step 5: Weld and seal the sealed area of ​​the vacuum insulation plate under atmospheric pressure.

[0036] Thus, the present invention relates to a method for encapsulating a metal vacuum insulation panel. After the panel is prepared, it is placed in a vacuum chamber and evacuated. Since the heat-sealing adhesive 5 forms an air extraction channel with the upper barrier 1 and the lower barrier 2, it facilitates the extraction of gas from the core material 3. After reaching a predetermined vacuum level, the upper barrier 1 and / or the lower barrier 2 are pressurized and heated within the vacuum chamber, causing the heat-sealing adhesive 5 to melt. The melted adhesive then heat-seales the upper barrier 1 and the lower barrier 2 together, achieving pre-sealing of the upper barrier 1 and the lower barrier 2. However, in a high-temperature environment, the heat-sealing adhesive 5 may remelt, leading to air leakage. To address this issue, the pre-sealed metal vacuum insulation panel is laser-welded at room temperature. Laser welding firmly connects the upper barrier 1 and the lower barrier 2, preventing air leakage in a high-temperature environment. Therefore, the present invention pre-seales and then performs laser welding encapsulation at room temperature under atmospheric conditions, resulting in a strong and reliable seal and good airtightness for the metal vacuum insulation panel.

[0037] In a preferred embodiment, in step five, a closed-end weld ring 6 is formed by welding and encapsulating the encapsulated area of ​​the vacuum insulation panel; the embodiment also includes a sixth step, which involves trimming and pruning the encapsulated area located outside the weld ring 6. After the vacuum insulation panel is laser-welded and encapsulated to form the closed-end weld ring 6, the laser welding firmly connects the upper barrier 1 and the lower barrier 2 together, resulting in a strong and reliable seal with good airtightness. At this time, the seal formed by the encapsulated area located outside the weld ring 6 presents both the problem of difficult placement of the metal vacuum insulation panel and the increase of boundary effects. Therefore, in step six, the encapsulated area located outside the weld ring 6 is trimmed and pruned to give the metal vacuum insulation panel a narrower seal, reducing the boundary effects.

[0038] In this embodiment, the heat-sealing adhesive 5 is ring-shaped. After the heat-sealing adhesive 5 melts, it is heat-sealed together with the upper barrier 1 and the lower barrier 2 to form a sealing area. The welding ring 6 is located inside the sealing area. When the sealing area is trimmed, the welding ring 6 will not be affected. Depending on the shape of the vacuum insulation board, the heat-sealing adhesive 5 can be ring-shaped or U-shaped.

[0039] like Figure 2 As shown, in this embodiment, the upper barrier 1 is an upper metal barrier film made of stainless steel foil or alloy material, and the lower barrier 2 is a lower metal barrier film made of stainless steel foil or alloy material. Thus, a bag-type metal vacuum insulation panel can be manufactured. Alternatively, as... Figure 1 As shown, the upper barrier 1 is a metal barrier film made of stainless steel foil or alloy material, and the lower barrier 2 is a barrier bottom shell formed by stamping stainless steel foil or alloy material. In this way, a shell-type metal vacuum insulation panel can be made.

[0040] Furthermore, the core material 3 is made of one or more of the following materials: centrifugal cotton, basalt, gaseous silica, and high-silica glass fiber. Different core materials 3 can be selected according to different needs. After testing, the thermal conductivity of a metal vacuum insulation panel made with centrifugal cotton core material using this encapsulation method is 2.1-2.4 mw / m·K; the thermal conductivity of a metal vacuum insulation panel made with basalt core material using this encapsulation method is <5 mw / m·K; and the thermal conductivity of a metal vacuum insulation panel made with gaseous silica core material + basalt core material using this encapsulation method is <10 mw / m·K.

[0041] Furthermore, the adsorbent 4 is made of one or more materials such as barium-lithium alloy, cobalt oxide, vanadium, zirconium, and iron. The adsorbent 4 absorbs residual moisture in the core material 3, thus maintaining good thermal insulation performance of the metal vacuum insulation panel.

[0042] In this embodiment, the heat-sealing adhesive 5 is preferably made by dispensing EVA or PES hot melt adhesive. PES refers to polyethersulfone, a high-performance thermoplastic engineering plastic with excellent heat resistance, chemical corrosion resistance, high-voltage electrical resistance, self-lubrication, and low coefficient of friction. After the PES heat-sealing adhesive melts under pressure and heat, it firmly heat-seales the upper barrier 1 and the lower barrier 2 together.

[0043] Preferably, the PES heat-sealing adhesive is applied to the edge of the lower barrier component by a ring-shaped dispensing method. Before encapsulation, the PES heat-sealing adhesive is applied to the edge of the lower barrier component by a ring-shaped dispensing method. Then, the core material 3 is placed on the lower barrier component 2, the absorbent 4 is placed on the core material 3, and finally the upper barrier component 1 is placed on the core material 3. Positioning is achieved by dispensing to prevent displacement of the PES heat-sealing adhesive and to ensure that the upper barrier component 1 and the lower barrier component 2 can be heat-sealed together.

[0044] In this embodiment, in step two, the plate is evacuated in a vacuum chamber, with a vacuum level of 0.01 Pa to 50 Pa. Preferably, the vacuum level in the vacuum chamber is less than 5 Pa, thereby achieving heat sealing of the upper barrier 1 and the lower barrier 2 together in a high vacuum chamber, resulting in a metal vacuum insulation panel with good heat insulation performance.

[0045] In a preferred embodiment of the present invention, in step three, the heat-sealing adhesive made of EVA material has a heat-sealing temperature of 50℃-150℃ and a heat-sealing time of 60S-120S; the heat-sealing adhesive made of PES material has a heat-sealing temperature of 110℃-210℃ and a heat-sealing time of 60S-120S. Testing has shown that at these temperatures and times, the upper barrier 1 and the lower barrier 2 can be firmly heat-sealed together.

[0046] In this embodiment, the heat-sealing adhesive 5 is a hot melt adhesive film, which is fixed to the lower barrier component using double-sided tape. Hot melt adhesive film is a derivative of hot melt adhesive; it is an environmentally friendly adhesive that requires high-temperature heating to melt and bond various materials. Fixing the hot melt adhesive film with double-sided tape ensures that the lower barrier component 2 is accurately heat-sealed to the upper barrier component 1. In this embodiment, the heat-sealing adhesive 5 can also be a PE, PA, SBS, EAA, or other heat-sealing adhesives.

[0047] Furthermore, in step five, the welding and encapsulation method is either laser welding or resistance welding. When the upper barrier 1 and lower barrier 2 are relatively thick, resistance welding can be used. Resistance welding generally involves applying a certain pressure to the workpieces being welded, using the workpieces as load resistors, and supplying power to the workpieces through the upper and lower electrodes. The Joule heat generated by the current passing through the workpieces melts the contact surfaces between the two workpieces, thus achieving a weld between the two contact surfaces. Resistance welding is suitable for thicker plates.

[0048] Preferably, in step five, the edges of the vacuum insulation panel are sealed by laser welding, and the peel strength of the vacuum insulation panel after laser welding is 20N / mm-60N / mm. After laser welding, the peel strength of the vacuum insulation panel is relatively large, resulting in a good sealing effect between the upper barrier 1 and the lower barrier 2, and making it less prone to air leakage.

[0049] To improve the insulation of the metal vacuum insulation panel, the surfaces of the upper barrier 1 and / or the lower barrier 2 are coated with an insulating coating, such as an electrically insulating coating, to achieve a strong insulation effect.

[0050] The present invention also discloses a metal vacuum insulation panel, which is manufactured using the above-described encapsulation method.

[0051] In summary, the metal vacuum insulation panel manufactured using this encapsulation method has a strong and reliable seal with good airtightness. The upper barrier 1 and lower barrier 2 are made of stainless steel foil or alloy material, possessing properties of acid and alkali resistance, puncture resistance, high and low temperature resistance, and non-flammability. Its operating temperature range is -196℃ to 600℃, and it can operate in environments up to 800℃. This metal vacuum insulation panel is suitable for aerospace, energy storage, new energy batteries, high-temperature household appliances and equipment, LNG pipeline insulation, and other fields.

[0052] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for encapsulating a metal vacuum insulation panel, characterized in that: Includes the following steps: Step 1: Place the plate, which has been prepared under atmospheric conditions, into a vacuum chamber; wherein the plate includes an upper barrier, a lower barrier, a core material, an adsorbent, and a heat sealant. The core material and the adsorbent are located between the upper barrier and the lower barrier, and the heat sealant is located at the edge sealing position of the upper barrier and the lower barrier, and an air extraction channel is formed between the heat sealant and the upper barrier and the lower barrier. Step 2: Vacuum the plate in the vacuum chamber, and the gas in the core material is drawn to the outside through the vacuum channel. Step 3: Pressurize and heat the upper barrier and / or lower barrier in the vacuum chamber to melt the heat-sealing adhesive between the upper barrier and the lower barrier, thereby sealing the upper barrier and the lower barrier together. Step 4: Break the vacuum and remove the vacuum insulation panel made inside the vacuum chamber; Step 5: Under atmospheric pressure, weld and seal the encapsulated area of ​​the vacuum insulation panel to form a closed weld ring within the encapsulated area of ​​the vacuum insulation panel.

2. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: It also includes step six, which involves trimming and cutting the edges of the adhesive sealing area located outside the welding ring.

3. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: The heat-sealing adhesive is ring-shaped. After melting, the heat-sealing adhesive is heat-sealed together with the upper and lower barrier components to form a sealed area.

4. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: The upper barrier is an upper metal barrier film made of stainless steel foil or alloy material, and the lower barrier is a lower metal barrier film made of stainless steel foil or alloy material.

5. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: The upper barrier is a metal barrier film made of stainless steel foil or alloy material, and the lower barrier is a barrier bottom shell formed by stamping stainless steel foil or alloy material.

6. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: The core material is made of one or more of the following materials: centrifugal cotton, basalt, gas silica, and high silica glass fiber.

7. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: The adsorbent is made of one or more materials such as barium-lithium alloy, cobalt oxide, vanadium, zirconium, and iron.

8. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: The heat-sealing adhesive is made of EVA, PES, PE, PA, SBS, or EAA hot melt adhesive; the heat-sealing temperature of the heat-sealing adhesive is 50℃-210℃, and the heat-sealing time is 60S-120S.

9. The metal vacuum insulation panel encapsulation method as described in claim 1, characterized in that: In step five, the welding and encapsulation method is laser welding or resistance welding.

10. A metal vacuum insulation panel, characterized in that: It is manufactured using the packaging method described in any one of claims 1-9.

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