Aerogel composite refrigerator glass cover plate

Abstract

The utility model belongs to the technical field of energy -conserving commercial refrigerator, concretely relates to a kind of aerogel composite refrigerator glass cover plate. The aerogel layer is located between the outer glass layer and the inner glass layer, the aerogel layer has gradient pore structure, and the pore size of the aerogel layer changes from large to small from the direction close to the outer glass layer to the direction away from the outer glass layer. The application fills the air layer part of traditional double-layer hollow glass with high-transmittance aerogel material, has high-transmittance and excellent heat preservation performance, and the cover plate can be thinned, which is very suitable for equipment with internal material display requirements, such as commercial ice cream cabinet.

Description

Technical Field

[0001] This utility model belongs to the field of energy-saving commercial refrigerator technology, specifically relating to an aerogel composite refrigerator glass cover. Background Technology

[0002] Commercial refrigerators are widely used in the food retail and catering industries. Their glass door covers must ensure good light transmission so customers can clearly see the goods inside, while also possessing excellent insulation performance to reduce cold loss and lower energy consumption. Traditional commercial refrigerator glass covers often use double-layered ordinary glass, which, while offering acceptable light transmission, has limited insulation. Replacing them with Low-e coated glass improves insulation somewhat, but overall, the insulation effect still needs improvement. This is mainly because coated glass only improves the radiative heat dissipation performance of the glass cover, but has little impact on air convection heat transfer. Even with double-layered glass, the air layer between the two panes easily forms convection, which is not conducive to heat insulation. While using inert gas instead of air in some double-layered glass solutions can improve insulation to some extent, the convection problem remains, resulting in poor insulation performance. Even if insulation materials are used to fill the interlayer, the limitations of the materials themselves often prevent them from simultaneously meeting the requirements of high light transmission and efficient insulation. Moreover, traditional commercial freezers have thick glass covers, making it difficult to open and close the doors.

[0003] Aerogel, as a novel nanoporous material, has extremely low thermal conductivity, and some aerogels also have high light transmittance. Its rational application in commercial refrigerator glass covers is expected to solve existing problems. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides an aerogel composite glass cover for a refrigerator.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: an aerogel composite refrigerator glass cover, comprising: an outer glass layer, an inner glass layer and an aerogel layer, wherein the aerogel layer is located between the outer glass layer and the inner glass layer, the aerogel layer has a gradient pore structure, and the pore size of the aerogel layer decreases from the direction close to the outer glass layer to the direction away from the outer glass layer.

[0006] Furthermore, the aerogel layer comprises an outer layer and an inner layer, wherein the pore size of the outer layer is 20nm~50nm, and the pore size of the inner layer is ≤20nm.

[0007] Furthermore, the outer surface of the outer glass layer is coated with a low-emissivity metal oxide film.

[0008] Furthermore, a transition layer is provided between the aerogel layer and the outer glass layer and the inner glass layer, respectively.

[0009] Furthermore, the aerogel layer is surrounded by an absorbent layer and a support layer from the inside out, and the absorbent layer and the support layer are located between the outer glass layer and the inner glass layer.

[0010] Furthermore, the edge of the cover plate is provided with a waterproof layer, a sealant layer and a frame layer from the inside out.

[0011] Furthermore, the waterproof layer has a U-shaped cross-section, and the sealant layer completely covers the waterproof layer.

[0012] Furthermore, the frame is provided with a card slot.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. Excellent heat preservation performance: The introduction of a high-transmittance aerogel layer, with its extremely low thermal conductivity, effectively blocks the heat exchange between the inside and outside of the freezer. Compared with traditional double-layer glass cover, it can significantly reduce cold loss, reduce freezer energy consumption, and lower operating costs.

[0015] 2. Excellent light transmittance: The use of high-transmittance aerogel and high-transmittance glass ensures that customers can clearly see the products inside the freezer from the outside, without affecting the product display effect and enhancing the consumer shopping experience.

[0016] 3. High structural reliability: The design of three-layer waterproof sealing material and aluminum alloy frame ensures that the entire glass cover is stable, waterproof and moisture-proof, and the aerogel layer can play a stable heat preservation role for a long time, extending the service life of the glass cover.

[0017] 4. Improved operability: By using low thermal conductivity aerogel to replace the air layer in the double glass, the thickness of this layer is significantly reduced, which in turn reduces the overall thickness of the glass cover, thereby improving the convenience of opening the door and making the door more operable.

[0018] In summary, this application uses a high-transmittance aerogel material to fill the air layer of traditional double-glazed insulated glass, which combines high light transmittance and excellent thermal insulation performance. Moreover, the cover plate can be thinned, making it very suitable for equipment that needs to display internal materials, such as commercial ice cream display cases. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of the aerogel composite refrigerator glass cover in Example 1;

[0020] Figure 2 This is a schematic diagram of the layer structure of the aerogel layer in Example 2;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the aerogel composite refrigerator glass cover in Example 3.

[0022] In the picture:

[0023] 1. Outer glass layer, 2. Inner glass layer, 3. Aerogel layer, 4. Water-absorbing layer, 5. Support layer, 6. Waterproof layer, 7. Sealant layer, 8. Frame, 301. Outer layer, 302. Inner layer. Detailed Implementation

[0024] To facilitate understanding of this utility model, it will be described in more detail below with reference to the accompanying drawings and specific embodiments. However, this utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0025] Example 1: Combination Figure 1 An aerogel composite refrigerator glass cover is understood to include: an outer glass layer 1, an inner glass layer 2, and an aerogel layer 3. The aerogel layer 3 is located between the outer glass layer 1 and the inner glass layer 2. The aerogel layer 3 has a gradient pore structure, and the pore size of the aerogel layer 3 decreases from the direction closer to the outer glass layer 1 to the direction farther away from the outer glass layer 1. The large pores on the outer side reflect infrared radiation, while the small pores on the inner side inhibit gas convection. The aerogel layer 3 is composed of silica aerogel doped with nanofibers and transparent resin, with a light transmittance ≥85% and a thermal conductivity ≤0.015 W / (m·K).

[0026] The outer edges of the outer glass layer 1 and the inner glass layer 2 are fixedly connected by a frame 8. The frame 8 is provided with a slot, and the edges of the outer glass layer 1, the inner glass layer 2, and the aerogel layer 3 are embedded in the corresponding slot and fixed with sealant. The frame 8 enhances the overall rigidity of the glass cover and facilitates installation and disassembly.

[0027] This application uses a high-transmittance aerogel material to fill the air layer of traditional double-glazed windows, thereby reducing air convection between the double panes and its impact on insulation performance. Simultaneously, the high transmittance of aerogel allows for light transmission not found in other filling materials, such as expanding foam, while maintaining insulation performance. Furthermore, due to the low thermal conductivity of aerogel, its thickness can be effectively reduced compared to double-glazed windows, resulting in a thinner cabinet door cover and improved ease of opening and closing. This makes it highly suitable for applications such as commercial ice cream display cases where displaying internal materials is required.

[0028] Example 2: Based on the structure of Example 1, combined with... Figure 2It is understood that the aerogel layer 3 includes an outer layer 301 and an inner layer 302, wherein the pore size of the outer layer 301 is 20nm~50nm, and the pore size of the inner layer 302 is ≤20nm.

[0029] Example 3: Based on the structure of Example 2, combined with Figure 3 It is understood that an absorbent layer 4 and a support layer 5 are sequentially arranged around the aerogel layer 3 from the inside out, and the absorbent layer 4 and the support layer 5 are located between the outer glass layer 1 and the inner glass layer 2, and are embedded in each other. The absorbent layer 4 can be made of activated carbon particles, covering the edges of the aerogel sheets in the aerogel layer 3 to keep the aerogel layer 3 dry and ensure its performance stability. The support layer 5 has a certain degree of elasticity, supporting the two glass layers and also providing a certain degree of cushioning.

[0030] The cover plate has a waterproof layer 6 and a sealant layer 7 arranged sequentially from the inside to the outside at its edge sealing end. The waterproof layer 6 has a U-shaped cross-section, and the sealant layer 7 completely covers the waterproof layer 6 and is located within the frame 8 to ensure the integrity of the seal. The waterproof sealing material required for the waterproof layer 6 needs to be structurally and chemically stable, able to bond tightly to glass, and have a certain degree of elasticity. Preferably, silicone sealant is used for sealing.

[0031] In one embodiment, a transition layer is provided between the aerogel layer 3 and the outer glass layer 1 and the inner glass layer 2, respectively. The transition layer may be a polyvinyl butyral film, and bubble-free bonding is achieved through hot pressing process to avoid light transmission loss caused by traditional adhesives.

[0032] In one embodiment, the outer surface of the outer glass layer 1 is coated with a low-emissivity metal oxide film, which can be titanium dioxide, to reflect infrared radiation while maintaining a visible light transmittance of over 90%.

[0033] The aerogel composite refrigerator glass cover has a core structure consisting of an outer tempered glass layer, an aerogel functional layer, an inner tempered glass layer, and edge sealing components, which are described in detail below with reference to the attached drawings:

[0034] like Figure 3 As shown, the outer glass layer 1 has a thickness of 2-3 mm. A low-emissivity metal oxide film, such as a TiO2 / Ag / TiO2 composite film, is sputtered on the tempered glass surface. The infrared reflectivity is ≥80% and the visible light transmittance is ≥90%.

[0035] The inner glass layer 2, with a thickness of 2-3mm, is made of the same material as the outer tempered glass and does not require low-emissivity coating treatment.

[0036] Aerogel layer 3, 2-5 mm thick, is made of gradient-pore silica aerogel, with pore diameters transitioning from ≤50 nm on the outer side to ≤20 nm on the inner side. It is doped with 5-10% nanofibers to enhance mechanical strength, has a light transmittance ≥85%, and a thermal conductivity ≤0.015 W / (m·K). The gradient pore design: large pores on the outer side (≤50 nm) reflect infrared radiation, while small pores on the inner side (≤20 nm) suppress gas convection.

[0037] The frame 8 wraps around the glass edge, and is filled with a double layer of butyl rubber and silicone sealant, with activated carbon desiccant particles embedded inside.

[0038] The sealant layer 7 is placed between the aluminum frame 8 and the glass to buffer stress and enhance airtightness.

[0039] Interface transition layer: The aerogel and glass are bonded together by hot pressing with a PVB film, avoiding the light transmission loss caused by traditional adhesives.

[0040] Before assembly, the glass substrate needs to be ultrasonically cleaned to remove surface impurities, ensuring adhesion to the aerogel while avoiding affecting light transmittance; then the adhered glass surface is nitrided for 5 minutes to increase its surface activity, and then a low-emissivity coating is applied to the outer surface of the outer glass.

[0041] Aerogels were prepared using the sol-gel method. Tetraethyl orthosilicate (TEOS) and anhydrous ethanol were mixed at a molar ratio of 1:5, followed by catalytic hydrolysis with 0.1% hydrochloric acid. 5% glass nanofibers (≤50 nm in diameter) were then doped into the mixture. The mixture was stirred for 2 hours to form a homogeneous sol. Gradient drying technology was then used to form inner and outer aerogels with different porosities. The aerogels were then hot-pressed onto a glass cover plate. The aerogel layer and an approximately 0.5 mm thick PVB film were hot-pressed at 120°C and 0.5 MPa for 30 minutes to eliminate air bubbles. The aerogel was then sandwiched between two layers of tempered glass, with pre-drained vents at the edges, and then vacuum-sealed. After sealing, elastic structural adhesive was applied between the aluminum frame and the glass, and the aluminum frame and glass were then installed.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. An aerogel composite glass cover for a refrigerator, comprising: The outer glass layer (1) and the inner glass layer (2) are characterized in that they further include: an aerogel layer (3) located between the outer glass layer (1) and the inner glass layer (2), the aerogel layer (3) having a gradient pore structure, and the pore size of the aerogel layer (3) decreasing from near the outer glass layer (1) to away from the outer glass layer (1).

2. The aerogel composite refrigerator glass cover according to claim 1, characterized in that, The aerogel layer (3) includes an outer layer (301) and an inner layer (302), wherein the pore size of the outer layer (301) is 20nm~50nm and the pore size of the inner layer (302) is ≤20nm.

3. The aerogel composite refrigerator glass cover according to claim 1, characterized in that, The outer surface of the outer glass layer (1) is coated with a low-emissivity metal oxide film.

4. The aerogel composite refrigerator glass cover according to claim 1, characterized in that, A transition layer is provided between the aerogel layer (3) and the outer glass layer (1) and the inner glass layer (2), respectively.

5. The aerogel composite refrigerator glass cover according to any one of claims 1-4, characterized in that, The aerogel layer (3) is surrounded by an absorbent layer (4) and a support layer (5) from the inside out, and the absorbent layer (4) and the support layer (5) are located between the outer glass layer (1) and the inner glass layer (2).

6. The aerogel composite refrigerator glass cover according to claim 5, characterized in that, The cover plate has a waterproof layer (6), a sealant layer (7) and a frame (8) arranged sequentially from the inside to the outside at the edge sealing end.

7. The aerogel composite refrigerator glass cover according to claim 6, characterized in that, The waterproof layer (6) has a U-shaped cross section, and the sealant layer (7) completely covers the waterproof layer (6).

8. The aerogel composite refrigerator glass cover according to claim 6, characterized in that, The frame (8) is provided with a card slot.

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