A three-dimensional elongated groove vacuum insulation structure and its preparation method

Abstract

To address the insulation problem of three-dimensional wing-like structures with protruding leading edges, this invention discloses a large-angle curved three-dimensional long-groove vacuum insulation structure and its preparation method. Through adsorption core material three-dimensional molding and stainless steel mold extrusion molding, the arc-shaped vacuum insulation panel achieves precise dimensional control, arbitrary angle bending, and extremely low thermal conductivity, further solving the insulation problem of protruding structures. The three-dimensional long-groove vacuum insulation structure disclosed in this invention consists of a frame, a core material, and a membrane material. The frame is made of nylon or polyimide, the core material is fumed silica or oxide fibers, and the membrane material is a composite membrane containing aluminum foil. Compared with splicing molding, integral molding eliminates thermal bridges caused by seams, reducing the risk of heat and cold leakage. The overall thermal conductivity can reach 0.0005 W / mK. Furthermore, mold molding allows the membrane material and core material to be completely bonded and adhered, effectively improving the surface flatness and smoothness of the panel and increasing the assembly accuracy with the target insulation component.

Description

Technical Field

[0001] This invention relates to a vacuum insulation structure and its preparation method, particularly to a three-dimensional elongated groove vacuum insulation structure and its preparation method, belonging to the field of thermal insulation materials. Background Technology

[0002] Vacuum insulation panels are composed of a porous core material and a vacuum protective barrier membrane. Due to their unique vacuum structure, they effectively restrict convective heat transfer, making them the super insulation material with the lowest known thermal conductivity. Therefore, under the same insulation requirements, vacuum insulation panels require a thinner thickness and are lighter in weight compared to other insulation materials. In addition, vacuum insulation panels also have excellent fire resistance and superior sound insulation properties, and are now widely used in cold chain transportation, home appliances, LNG transportation, building insulation, military industry, and even aerospace fields.

[0003] However, in practical applications, vacuum insulation panels are mostly single-plate structures, which limits their application range. Chinese Utility Model Patent 202222228236.3 discloses a double-sided concave vacuum insulation panel, including a composite insulation panel. The composite insulation panel has an internal irregularly shaped core material device, which includes an air-absorbing core material, a supporting core material, and heat-insulating grooves. The supporting core material has multiple outward-facing heat-insulating grooves running through its upper and lower ends. Each of these heat-insulating grooves contains an air-absorbing core material. A fixing device is provided at the front end of the composite insulation panel. This technical solution solves the problems of the vacuum insulation panel's flat outer wall making it difficult to bend, its smooth outer wall resulting in a small adhesion area, and its heavy weight making it prone to detachment. Chinese patent CN201710736115.0 discloses an integrated vacuum insulation panel three-dimensional storage box, including a box body that unfolds as a whole. The box body unfolds into six rigid plastic panels, with soft material at the joints between the rigid plastic panels. Each side of the box body's interior is fitted with a vacuum insulation panel. Each rigid plastic panel of the box body can be folded and assembled for fixation. Four vertical rigid plastic panels of the box body are fitted with first fixing devices near the bottom, and two opposing vertical rigid plastic panels are fitted with second fixing devices near the top. The first fixing device includes a first stop rack, a first gear, and a first turning contact. This invention provides a storage box with a reasonable design structure, good insulation effect, and a vacuum inside the insulation panel, thus reducing the thermal bridging effect and minimizing heat loss. The box is also easy to disassemble and install.

[0004] For three-dimensional wing-like structures with protruding leading edges, it is necessary to prepare a high-efficiency slot-type thermal insulation structure that is in close contact with it. The current traditional manufacturing methods of vacuum insulation panels cannot completely solve this problem, mainly because vacuum insulation panels cannot be bent at large angles. Therefore, new technologies need to be developed. Summary of the Invention

[0005] To address the insulation problem of three-dimensional wing-like protruding leading edge structures, this invention discloses a three-dimensional long groove vacuum insulation structure with large-angle bending and its preparation method. This enables the arc-shaped vacuum insulation panel to achieve precise and controllable dimensions, bend at any angle, and simultaneously possess extremely low thermal conductivity, further solving the insulation problem of protruding structures.

[0006] To achieve the above objectives, the three-dimensional elongated slotted vacuum insulation structure disclosed in this invention comprises a frame, a core material, and a membrane material. The frame is made of nylon or polyimide, the core material is made of fumed silica or oxide fibers, and the membrane material is a composite membrane containing aluminum foil. The overall thermal conductivity is less than 0.0005 W / mK.

[0007] The three-dimensional long groove vacuum insulation structure is folded in half along its width, with one side concave and the other side convex. The convex part can be either right-angled or arc-shaped, and the height is the line connecting the two points at the widest point from the apex of the convex part.

[0008] The present invention also discloses a method for preparing the above-mentioned structure, comprising the following steps in sequence:

[0009] 1) Metal wire mesh processing to form a shape consistent with the surface of the groove in the structure, with both sides closed;

[0010] 2) Coat the surface of the metal wire mesh structure with an oily release agent, place it in a glass wool slurry tank, and filter it from the side of the groove;

[0011] 3) After a certain period of filtration, one side can be blocked to continue filtration. When the filtration cotton felt reaches a certain thickness, the metal wire mesh structure and cotton are removed together and dried.

[0012] 4) Prepare a grooved metal outer mold, the shape of the inner surface of the groove is consistent with the outer surface of the raised part of the vacuum insulation structure;

[0013] 5) Prepare a grooved metal inner mold, the shape of the outer surface of the groove is consistent with the inner surface of the vacuum insulation structure groove;

[0014] 6) Place the grooved metal outer mold onto the metal wire mesh structure dried in step (3) and the cotton protrusion. Aluminum-plastic composite film is pre-attached between the mold and the cotton. Then the metal wire mesh is demolded.

[0015] 7) The grooved metal inner mold supports the cotton groove surface in step (6), and aluminum-plastic composite film is pre-attached between the mold and the cotton; 8) Fill the gap between the inner mold and the outer mold with the frame, and the frame is in close contact with the surrounding frame.

[0016] 9) The inner and outer molds are connected and tightened by edge bolts, and fit tightly with the frame;

[0017] 10) Place the tightened inner and outer molds into the vacuum chamber and evacuate the vacuum until the vacuum level is below 0.1 Pa;

[0018] 11) Heat the vacuum chamber, maintain the temperature for a certain period of time, and then cool it down to room temperature;

[0019] 12) Remove the inner and outer molds from the vacuum chamber, unscrew the nuts, and obtain a three-dimensional long groove vacuum insulation structure.

[0020] Beneficial effects

[0021] This invention breaks through the traditional single-flat-panel vacuum insulation panel design, enabling various complex insulation designs through splicing, effectively broadening the application range of vacuum insulation panels. Compared with splicing molding, integral molding eliminates thermal bridges caused by seams, reducing the risk of heat and cold leakage in insulation, with an overall thermal conductivity conversion of 0.0005W / mK. Furthermore, mold forming allows for complete adhesion and bonding between the membrane material and the core material, effectively improving the surface flatness and smoothness of the panel and increasing the assembly precision with the target insulation component. Attached Figure Description

[0022] Figure 1 The three-dimensional long groove vacuum insulation structure of the present invention is shown in the figure. 1 is the aluminum-plastic composite film of the protruding part of the vacuum insulation structure, 2 is glass wool, 3 is the aluminum-plastic composite film of the groove part of the vacuum insulation structure, and 4 is the nylon frame.

[0023] Figure 2 The cross-section is an angular vacuum insulation structure.

[0024] Figure 3 The cross-section is a corrugated vacuum insulation structure. Detailed Implementation

[0025] To facilitate understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will now be further described in conjunction with the accompanying drawings.

[0026] Example

[0027] Reference Figure 2 A vacuum insulation structure with an angled cross-section, 10mm thick at the top and 20mm thick at the bottom, with an angle of 45°. Figure 2 The vertical maximum diameter is 200mm, and the length is 1 meter. The fabrication method of this structure includes the following sequential steps:

[0028] 1) Metal wire mesh processing, forming and Figure 2 The inner surface on the right side has a consistent shape, and both sides are closed.

[0029] 2) Coat the surface of the metal wire mesh structure with an oily release agent, place it in a glass wool slurry tank, and filter it from the side of the groove;

[0030] 3) After 10 minutes of suction filtration, place a stainless steel plate outside the long side of the metal wire mesh and cotton felt to block adsorption, continue suction filtration for another 10 minutes, remove the metal wire mesh structure and cotton felt together, remove the stainless steel plate, and dry.

[0031] 4) Prepare a cross-sectional angled metal outer mold, the inner surface shape of which is the same as... Figure 2 The left outer surface is consistent;

[0032] 5) Prepare a cross-sectional angled metal inner mold, the shape of the outer surface of the angle being the same as... Figure 2 The inner surface on the right side is consistent;

[0033] 6) Place the metal outer mold onto the metal wire mesh structure and cotton raised surface dried in step (3). Aluminum-plastic composite film is pre-attached between the mold and the cotton. Then the metal wire mesh is demolded.

[0034] 7) Press the metal inner mold against the cotton groove surface in step (6), and pre-attach an aluminum-plastic composite film between the mold and the cotton.

[0035] 8) Fill the gap between the inner mold and the outer mold with nylon borders, ensuring tight contact between the four borders;

[0036] 9) The inner and outer molds are connected and tightened by edge bolts, and fit tightly with the nylon;

[0037] 10) Place the tightened inner and outer molds into the vacuum chamber and evacuate until the vacuum level reaches 0.01 Pa;

[0038] 11) Heat the vacuum chamber to 200℃ and hold for 6 minutes, then cool to room temperature;

[0039] 12) Remove the inner and outer molds from the vacuum chamber, unscrew the nuts, and obtain... Figure 2 Vacuum insulation structure.

[0040] Example

[0041] Reference Figure 3 A type of vacuum insulation structure with a corrugated cross-section and a uniform thickness of 15mm. Figure 3 The product has a vertical height of 300mm, a length of 1.8 meters, a polyimide frame, and a core material of chopped fiberglass. Its manufacturing method is as follows:

[0042] 1) Metal wire mesh processing, forming and Figure 3 The inner surface on the right side has a consistent shape, and both sides are closed.

[0043] 2) Coat the surface of the metal wire mesh structure with an oily release agent, place it in a chopped wire slurry tank, and filter it from the side of the groove;

[0044] 3) After 15 minutes of suction filtration, remove the metal mesh structure and the adsorbed cotton felt together, dry them, trim the edges, and adjust the size accordingly. Figure 3 Consistent product structure;

[0045] 4) Prepare a corrugated metal outer mold, the inner surface shape of which is similar to... Figure 3 The left outer surface is consistent;

[0046] 5) Prepare a corrugated metal inner mold, the outer surface of which is shaped like... Figure 3 The inner surface on the right side is consistent;

[0047] 6) Place the wavy metal outer mold onto the raised surface of the metal wire mesh structure and cotton felt that was dried in step (3). Aluminum-plastic composite film is pre-attached between the mold and the cotton. Then the metal wire mesh is demolded.

[0048] 7) Press the wavy metal inner mold against the groove surface of the cotton felt dried in step (6), and apply an aluminum-plastic composite film between the mold and the cotton in advance;

[0049] 8) Fill the gap between the inner mold and the outer mold with a polyimide border, ensuring that the borders are in close contact with each other and there are no gaps between them and the cotton felt.

[0050] 9) The inner and outer molds are connected and tightened by edge bolts, and are tightly fitted to the polyimide;

[0051] 10) Place the tightened inner and outer molds into the vacuum chamber and evacuate the vacuum until the vacuum level reaches 0.001 Pa; 11) Heat the vacuum chamber to 250°C and hold for 2 minutes, then cool it down to room temperature;

[0052] 12) Remove the inner and outer molds from the vacuum chamber, unscrew the nuts, and obtain... Figure 3 product.

[0053] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the scope of protection of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for preparing a three-dimensional elongated groove-type vacuum insulation structure, characterized in that... The three-dimensional elongated slotted vacuum insulation structure consists of a frame, a core material, and a membrane material. The structure is folded in half along its width, with one side concave and the other convex. The convex shape is either right-angled or arc-shaped. The fabrication method includes the following sequential steps: (1) Metal wire mesh processing to form a shape consistent with the surface of the groove of the three-dimensional long groove vacuum insulation structure, with both sides closed; (2) Coat the surface of the metal wire mesh structure with an oily release agent, place it in a glass wool slurry tank, and filter it from the side of the groove. (3) After a certain period of filtration, cover one side and continue filtration. When the filtration cotton felt reaches a certain thickness, remove the metal wire mesh structure and the cotton felt together and dry them. (4) Prepare a grooved metal outer mold, the shape of the inner surface of the groove is consistent with the outer surface of the raised vacuum insulation structure; (5) Prepare a grooved metal inner mold, the shape of the outer surface of the groove is consistent with the inner surface of the vacuum insulation structure groove; (6) Place the grooved metal outer mold onto the raised surface of the metal wire mesh structure and cotton felt that was dried in step (3). Aluminum-plastic composite film is pre-attached between the mold and the cotton felt. Then the metal wire mesh is demolded. (7) The grooved metal inner mold supports the grooved surface of the cotton felt in step (6), and aluminum-plastic composite film is pre-attached between the mold and the cotton felt; (8) Fill the gap between the inner mold and the outer mold with the border, and make the borders in close contact around the edges; (9) The inner mold and the outer mold are connected and tightened by edge bolts, and fit tightly with the frame; (10) Place the tightened inner mold and outer mold into the vacuum chamber and evacuate the vacuum. When the vacuum level is lower than 0.1 Pa; (11) Heat the vacuum chamber, keep it at the temperature for a certain time, and then cool it down to room temperature; (12) The inner and outer molds are removed from the vacuum chamber, and the nuts are unscrewed to obtain a three-dimensional long groove vacuum insulation structure.

2. The method for preparing a three-dimensional elongated groove vacuum insulation structure according to claim 1, characterized in that... The frame is made of nylon or polyimide, with an overall thermal conductivity of less than 0.0005 W / m·K.

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