A hollow sandwich composite heat-reflective glass structure with a built-in fabry-perot cavity

Abstract

The utility model provides a kind of hollow sandwich composite heat-induced insulating glass structure of built-in Fabry-Perot cavity, it is sequentially provided with second glass component, hollow cavity, hollow glass, first heat insulation film from outside to inside;Hollow cavity is connected with the structure glue of being arranged at its periphery by spacing strip with butyl glue at both ends, structure glue is clamped between second glass component and hollow glass, Fabry-Perot cavity is located in hollow cavity, Fabry-Perot cavity surface is equipped with Low-E film layer and vanadium dioxide doped layer, wherein the proportion of tungsten element doped in vanadium dioxide doped layer is 1%~3%.Hollow sandwich composite heat-induced insulating glass structure of built-in Fabry-Perot cavity described in the utility model can control the energy transmittance of overall glass by the change of external heat, the higher external heat is, the less energy transmits glass, and the better heat insulation effect is.

Description

Technical Field

[0001] This utility model belongs to the field of glass structure, and particularly relates to a hollow sandwich composite thermotropic insulating glass structure with an internal Fabry-Perot cavity. Background Technology

[0002] Fabry-Perot cavities possess a high degree of precision, enabling extremely fine filtering of light at different frequencies. Only light with frequencies meeting specific conditions can form stable oscillations within the cavity, thus achieving high-precision selection of light frequencies. Thermotropic insulating glass is a type of glass with special heat-insulating properties, adjusting its insulation effect according to temperature changes. Insulating glass is a composite glass product consisting of two or more panes of glass separated by spacers (aluminum / stainless steel / composite materials), with edges sealed with sealant (butyl sealant + silicone sealant), and filled with a dry gas (air / argon / krypton).

[0003] Most existing technologies use thermochromic glass, which heats the glass body as the ambient temperature rises, causing it to change color, alter its light absorption, and reduce visible light transmittance, thereby improving the overall heat insulation effect. However, when used in large-area curtain walls, the gas in the insulating space hinders heat conduction, causing the inner thermochromic coating to sense external temperature with a delay of 10-30 minutes, and the temperature regulation fails under extreme weather conditions (such as sudden rain followed by sunshine). Furthermore, the high thermal conductivity of the metal spacer at the edges of the insulating glass can easily create a "thermal bridge effect" with a temperature difference of 15-20℃, leading to uneven color change. Utility Model Content

[0004] In view of this, the present invention aims to propose a hollow sandwich composite thermochromic insulating glass structure with a built-in Fabry-Perot cavity to solve the problems of uneven color change caused by the gas barrier in the hollow layer blocking heat conduction when thermochromic glass is used in large-area curtain walls, resulting in a delayed sensing of external temperature by the inner thermochromic coating and failure of temperature control under extreme climates; and the "thermal bridge effect" of 15-20℃ easily forming at the edges of the hollow glass due to the high thermal conductivity of the metal spacer strip.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] This utility model provides a hollow sandwich composite thermotropic insulating glass structure with an internal Fabry-Perot cavity. From the outside to the inside, it comprises a second glass assembly, a hollow cavity, an insulating glass unit, and a first insulating film. The hollow cavity is connected to a structural adhesive disposed around its periphery via spacers with butyl rubber at both ends. The structural adhesive is sandwiched between the second glass assembly and the insulating glass unit. The Fabry-Perot cavity is located within the hollow cavity. The surface of the Fabry-Perot cavity is provided with a Low-E film layer and a vanadium dioxide doped layer, wherein the vanadium dioxide doped layer contains 1% to 3% tungsten.

[0007] Furthermore, the Fabry-Perot cavity thickness is 1–3 μm, and the Low-E film thickness is 50–300 nm.

[0008] Furthermore, the Fabry-Perot cavity is located on the inner or outer surface of the hollow cavity.

[0009] Furthermore, both the insulated glass and the second glass component are flat glass with a thickness of 4 mm or more.

[0010] Furthermore, the second glass component is a single-layer glass or a laminated glass.

[0011] Furthermore, the interlayer material of the laminated glass is one of PVB, SGP, or EVA.

[0012] Furthermore, the first heat insulation film material is one or a combination of two or more of the following: online Low-E, offline silver-free Low-E, solar film, and colored glaze.

[0013] Furthermore, the spacer strip is made of one or two of aluminum, stainless steel, and plastic, and the spacer strip contains absorbent material.

[0014] Furthermore, the water-absorbing material is a molecular sieve.

[0015] Furthermore, the hollow cavity is filled with one or a combination of two or more of argon, nitrogen, and krypton.

[0016] Compared with existing technologies, the hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity described in this invention has the following advantages:

[0017] (1) In this utility model, the Fabry-Perot cavity is located outside the hollow cavity, which can avoid the influence of changes in the environment inside the hollow cavity, improve its stability and reliability, and at the same time reduce the heat accumulation inside the hollow glass, ensuring that the hollow glass can continue to exert its original advantages and extend the service life of the glass. The energy transmittance of the overall glass can be controlled by the change of external heat. The higher the external heat, the less energy passes through the glass, and the better the heat insulation effect.

[0018] (2) This invention has a small impact on visible light transmittance and a small change in color, hardly affecting the appearance color and indoor lighting. The energy change of the actual product is relatively synchronous with the temperature change, and the reaction time is within 1 second. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] In the attached diagram:

[0021] Figure 1 This is a schematic diagram of the internal structure of the hollow sandwich composite thermotropic insulating glass structure with a built-in Fabry-Perot cavity when the Fabry-Perot cavity is located on the inner surface of the hollow cavity in an embodiment of this utility model.

[0022] Figure 2 This is a schematic diagram of the hollow sandwich composite thermotropic insulating glass structure with an internal Fabry-Perot cavity, when the Fabry-Perot cavity is located on the outdoor surface of the hollow cavity in an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Insulating glass; 2. Fabry-Perot cavity; 3. First heat insulation film; 4. Second glass assembly; 5. Spacer strip; 6. Butyl rubber; 7. Hollow cavity; 8. Structural adhesive. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] See Figure 1-2 As shown, this embodiment provides a hollow sandwich composite thermotropic insulating glass structure with a built-in Fabry-Perot cavity. From the outside to the inside, it comprises a second glass assembly 4, a hollow cavity 7, an insulating glass unit 1, and a first insulating film 3. The hollow cavity 7 is connected to a structural adhesive 8 located on its periphery via spacers 5 with butyl adhesive 6 at both ends. The structural adhesive 8 is sandwiched between the second glass assembly 4 and the insulating glass unit 1. The Fabry-Perot cavity 2 is located within the hollow cavity. The surface of the Fabry-Perot cavity 2 is coated with a Low-E film and a vanadium dioxide doped layer, wherein the vanadium dioxide doped layer contains 1% to 3% tungsten. The Low-E film is deposited by magnetron sputtering, and the vanadium dioxide doped layer is formed by spin coating. The magnetron sputtering process is a mature technology and equipment that can be directly applied; only appropriate modifications to the spin coating equipment are needed for mass production.

[0030] Specifically, in this embodiment, the thickness of the Fabry-Perot cavity 2 is 1–3 μm, and the thickness of the Low-E film is 50–300 nm.

[0031] Specifically, in this embodiment, the Fabry-Perot cavity 2 is located on the inner or outer surface of the hollow cavity 7.

[0032] Specifically, in this embodiment, both the insulating glass 1 and the second glass assembly 4 are flat glass with a thickness of 4 mm or more.

[0033] Specifically, in this embodiment, the second glass component 4 is a single-layer glass or a laminated glass.

[0034] Specifically, in this embodiment, when the second glass component 4 is laminated glass, the interlayer material of the laminated glass is one of PVB, SGP, and EVA.

[0035] Specifically, in this embodiment, the first heat insulation film 3 is made of one or a combination of two or more of the following: online Low-E, offline silver-free Low-E, solar film, and colored glaze.

[0036] Specifically, in this embodiment, the spacer 5 is made of one or two of aluminum, stainless steel, and plastic, and the spacer 5 is provided with a water-absorbing material, which can be a molecular sieve.

[0037] Specifically, in this embodiment, the hollow cavity 7 is filled with one or a combination of two or more of argon, nitrogen, and krypton.

[0038] Example 1:

[0039] When the Fabry-Perot cavity 2 is located on the inner surface of the hollow cavity 7, the glass configuration is as follows: 6mm ultra-clear tempered glass combined with hollow glass (12A), 6mm ultra-clear tempered glass combined with (combined with the Fabry-Perot cavity, the second glass component is spin-coated with offline silver-free Low-E film).

[0040] Example 2:

[0041] When the Fabry-Perot cavity 2 is located outside the hollow cavity 7, the glass configuration is: 6mm ultra-clear tempered glass (Fabry-Perot cavity) combined with hollow glass (12A) and 6mm ultra-clear tempered glass (spin-coated offline silver-free Low-E film).

[0042] The offline silver-free Low-E film, whose main component is ITO (indium tin oxide), has a visible light transmittance of 90% to 91%. The experiment uses a specific instrument (spectrophotometer) and detection device. The detection device simulates the ambient temperature rising from room temperature of 23°C to the target temperature of 60°C to simulate the use environment of glass.

[0043] In Example 1, at 23°C, the glass has a visible light transmittance of TL (58.7), a* (23°C) transmittance of red and green colors of -3, b* (23°C) transmittance of yellow and blue colors of 3.2, and SHGC (23°C) total solar energy transmittance of 0.59.

[0044] At 60℃, this glass has a visible light transmittance (TL) of 54.4, a*(60℃) representing the red-green color transmittance of -2.1, b*(60℃) representing the yellow-blue color transmittance of 3.3, and SHGC(60℃) representing the total solar energy transmittance of 0.52. The control efficiency = [SHGC(23℃) - SHGC(60℃)] * 100% = 7%.

[0045] In Example 2, at 23°C, the glass has a visible light transmittance of TL (56.3), a* (23°C) transmittance of red and green colors of -3.2, b* (23°C) transmittance of yellow and blue colors of 3.2, and a total solar energy transmittance of SHGC (23°C) of 0.54.

[0046] At 60℃, the visible light transmittance (TL) of this glass is 52.6%. The red-green transmittance value (a*) at 60℃ is -2, the yellow-blue transmittance value (b*) at 60℃ is 3.2, and the total solar energy transmittance (SHGC) at 60℃ is 0.45. The control efficiency = [SHGC(23℃) - SHGC(60℃)] * 100% = 9%.

[0047] Analysis shows that temperature changes have little impact on visible light transmittance, remaining within 5%. Color changes are also minimal, with the color remaining within the same family before and after the change, and the deviation is small, having little impact on the product's appearance. The insulated laminated thermotropic insulating glass structure with an internal Fabry-Perot cavity can control the overall energy transmittance of the glass by adjusting for changes in external heat. Higher external heat results in less energy passing through the glass, leading to better insulation. Furthermore, the impact on visible light transmittance and color change is minimal, having almost no effect on the appearance and not affecting indoor lighting. In actual products, energy changes are highly synchronized with temperature changes, with a response time of less than 1 second. The Fabry-Perot cavity, located on the outside of the hollow cavity, avoids the influence of changes in the internal environment, improving its stability and reliability. It also reduces heat accumulation on the inside of the insulated glass, ensuring it continues to offer its original advantages and extending its lifespan.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hollow laminated composite thermotropic insulating glass structure with an internal Fabry-Perot cavity, characterized in that, The structure consists of a second glass assembly, a hollow cavity, an insulated glass unit, and a first heat insulation film, arranged sequentially from the outside to the inside. The hollow cavity is connected to the structural adhesive surrounding it by spacers with butyl rubber at both ends. The structural adhesive is sandwiched between the second glass assembly and the insulated glass unit. The Fabry-Perot cavity is located inside the hollow cavity. The surface of the Fabry-Perot cavity is provided with a Low-E film layer and a vanadium dioxide doped layer.

2. The hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity according to claim 1, characterized in that, The Fabry-Perot cavity thickness is 1~3μm, and the Low-E film thickness is 50~300nm.

3. The hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity according to claim 2, characterized in that, The Fabry-Perot cavity is located on the inner or outer surface of the hollow cavity.

4. The hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity according to claim 1, characterized in that, Both the insulated glass and the second glass assembly are flat glass with a thickness of 4 mm or more.

5. The hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity according to claim 1, characterized in that, The second glass component is either single-pane glass or laminated glass.

6. The hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity according to claim 5, characterized in that, The interlayer material of laminated glass is one of PVB, SGP, or EVA.

7. The hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity according to claim 1, characterized in that, The spacer strip is made of one or two of the following materials: aluminum, stainless steel, and plastic, and the spacer strip contains absorbent material.

8. The hollow laminated composite thermotropic insulating glass structure with an embedded Fabry-Perot cavity according to claim 7, characterized in that, The water-absorbing material is a molecular sieve.

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