Insulating glass

Abstract

To improve the heat insulation property of a window of a double-glazed glass including a hollow layer filled with gas, and a vacuum layer.SOLUTION: A double-glazed glass 1 includes: first and second plate glasses 3, 4 separately arranged via at least a spacer 41; a third plate glass 5 arranged separately from the second plate glass 4 in an outer peripheral part via a vacuum layer sealing material 47; a hollow layer 10 formed between the first and second plate glasses 3, 4 and filled with gas; a vacuum layer 30 formed between the second and third plate glasses 4, 5; and a hollow layer sealing material disposed at an outer peripheral side from the spacer 41 in the outer peripheral part of the hollow layer 10. A relation between a width A1 of the vacuum layer sealing material 47, a width B1 of a center in a thickness direction of the spacer 41, and a width B2 of a center in a thickness direction of the hollow layer sealing material with respect to a width direction β of the double-glazed glass 1 is A1<B1+B2 so as to reduce a heat flow flux density in the spacer 41 when heat transmission is performed between the first and third plate glasses 3, 5.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to insulating glazing. [Background technology]

[0002] In recent years, in order to meet the demands for ZEH (Zero Energy Houses) and ZEB (Zero Energy Buildings), there has been a demand for window glass with significantly improved insulating performance.One of the means being considered to achieve this is the use of double-glazed glass, which includes vacuum-insulating glass, in which the pressure in the gap between the two glass panes is equivalent to that of a vacuum layer.

[0003] Patent Document 1 describes a double-glazing unit in which a spacer is sandwiched between two glass sheets, the outer periphery between the two glass sheets is sealed with a sealing part, and the gap between the two glass sheets is reduced in pressure to 0.1 Pa or less. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-179439 A Summary of the Invention [Problem to be solved by the invention]

[0005] It is conceivable to form a hollow layer by placing another glass sheet with a gap on one side of the vacuum insulating glass, and to fill the hollow layer with an inert gas such as argon gas or krypton gas, or a gas such as dry air, to form a double-glazed glass. However, in this double-glazed glass, heat is transferred through the spacer for forming the hollow layer and the sealing material for forming the vacuum layer of the vacuum insulating glass, and the amount of heat transfer may be large. As a result, there is room for improvement in terms of improving the insulating performance of window glass using double-glazed glass.

[0006] An object of the present disclosure is to improve the heat insulation performance of a window glass provided with a double-layer glass including a hollow layer filled with gas and a vacuum layer.

Means for Solving the Problems

[0007] The double-layer glass of the present disclosure includes a first plate glass and a second plate glass spaced apart at least via a spacer, a third plate glass spaced apart from the second plate glass via a vacuum layer sealing material at the outer peripheral portion, a hollow layer formed between the first plate glass and the second plate glass and filled with gas, a vacuum layer formed between the second plate glass and the third plate glass and having a pressure lower than the standard atmospheric pressure, and a hollow layer sealing material provided on the outer peripheral side of the spacer at the outer peripheral portion of the hollow layer. The double-layer glass is configured such that, in order to reduce the heat flux density in the spacer when heat transfer occurs between the first plate glass and the third plate glass, with respect to the finding direction orthogonal to the side direction at each side portion when the double-layer glass is viewed in the thickness direction, the relationship between the width A1 of the vacuum layer sealing material, the width B1 at the center in the thickness direction of the spacer, and the width B2 at the center in the thickness direction of the hollow layer sealing material is A1 < B1 + B2.

Advantages of the Invention

[0008] According to the double-layer glass according to the present disclosure, since the range in the finding direction of the portion where the spacer and the vacuum layer overlap in the thickness direction of the double-layer glass becomes larger, the heat transfer suppression effect of the vacuum layer on the spacer becomes larger. As a result, the heat flux density in the spacer becomes smaller, and the linear heat transmittance particularly at the edge portion of the outer periphery of the double-layer glass becomes smaller, thereby improving the heat insulation performance of the window glass provided with the double-layer glass.

Brief Description of the Drawings

[0009] [Figure 1] It is a view of the double-layer glass of the embodiment viewed in the thickness direction. [Diagram 2] It is a cross-sectional view taken along line A-A of FIG. 1. [Diagram 3] It is an enlarged view of part B of FIG. 2. [Figure 4]FIG. 13 is a diagram showing the results of a simulation in which the relationship between the margin width of a vacuum layer sealing material, the heat insulating performance, adhesive strength, and sealing reliability of insulating glass is obtained. [Diagram 5] FIG. 4 is a view corresponding to FIG. 3 showing the insulating glass of the comparative example. [Figure 6] FIG. 5 is a view corresponding to FIG. 3 of insulating glass according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present disclosure will be described with reference to the drawings. The shapes, materials, values, and quantities described below are examples for the purpose of explanation, and can be changed as appropriate according to the specifications of the insulating glass. In the following, the same elements in all the drawings will be assigned the same reference numerals. In addition, in the description in the text, the reference numerals previously described will be used as necessary.

[0011] 1 to 3 show a double-glazing unit 1 according to an embodiment. The double-glazing unit 1 includes a group of glass sheets 2, a first hollow layer 10, a second hollow layer 11, a vacuum layer 30, and a second sealing material 40. The group of glass sheets 2 includes a first, second, third, and fourth glass sheets 3, 4, 5, and 6, which are four glass sheets. Each of the glass sheets 3 to 6 is transparent or translucent. Each of the glass sheets 3 to 6 is rectangular and flat, has a flat surface, and has a predetermined thickness.

[0012] The fourth glass pane 6 is positioned furthest from the room, and the third glass pane 5 is positioned furthest from the room. The first glass pane 3 is positioned between the fourth glass pane 6 and the second glass pane 4, so as to face the indoor main surface 6a of the fourth glass pane 6 and the outdoor main surface 4a of the second glass pane 4. The second glass pane 4 is positioned between the first glass pane 3 and the third glass pane 5, so as to face the indoor main surface 3a of the first glass pane 3 and the outdoor main surface 5a of the third glass pane 5. The insulating glass 1 is assembled around the inner periphery of a frame-shaped frame (not shown) to form a window pane.

[0013] A heat reflecting film may be provided on the indoor main surface 6a of the fourth glass sheet 6, both main surfaces 3a, 3b of the first glass sheet 3, and the outdoor main surface 4a of the second glass sheet 4. The heat reflecting film is composed of an infrared reflecting film formed of a thin metal film having infrared blocking properties, or the like. The heat reflecting film can block the passage of infrared rays through the glass sheets on which it is provided. The heat reflecting film may be a Lo-E film.

[0014] The first hollow layer 10 and the second hollow layer 11 are formed between the first glass sheet 3 and the second glass sheet 4, and between the fourth glass sheet 6 and the first glass sheet 3, respectively, and are filled with dry air or an inert gas such as argon gas or krypton gas. Specifically, the first glass sheet 3 and the second glass sheet 4 are spaced apart in the thickness direction via a spacer 41 and a first sealing material 45 on both sides of the spacer 41 in the thickness direction. The spacer 41 is a hollow, approximately rectangular frame-shaped member arranged on the outer periphery between the first glass sheet 3 and the second glass sheet 4. The material of the spacer 41 is not particularly limited, but it is formed into a predetermined shape by, for example, a metal such as aluminum or an alloy containing aluminum, a composite of a resin and a metal, or a configuration in which a metal foil is provided on the surface of a resin. The spacer 41 has a spacer internal space 42 and a through hole 43 that communicates the spacer internal space 42 with a gas-filled space on the inner periphery side of the spacer 41 between the first glass sheet 3 and the second glass sheet 4. A desiccant (not shown) such as silica gel is accommodated in the spacer internal space 42. This makes it possible to dry the gas in the first hollow layer 10. The spacer 41 may not be hollow, and the desiccant may be omitted.

[0015] The first sealing material 45 adheres to the main surface 3a of the first glass sheet 3 and the spacer 41, and seals between the main surface 3a and the spacer 41, thereby preventing moisture from entering the first hollow layer 10. An adhesive made of, for example, butyl rubber can be used as the first sealing material 45. The first sealing material 45 corresponds to a sealing material on the inner circumference side of the hollow layer.

[0016] The second sealing material 40 is provided on the outer periphery of the first hollow layer 10, closer to the outer periphery than the spacer 41 and the first sealing material 45. The second sealing material 40 is bonded to the first glass sheet 3 and the second glass sheet 4, and suppresses deformation of the first sealing material 45 by retaining its shape. For example, a resin such as silicone, urethane, or polysulfide can be used as the second sealing material 40. The second sealing material 40 corresponds to a hollow layer sealing material.

[0017] The configurations of the spacer 41 and the first and second sealing materials 45, 40 arranged in the second hollow layer 11 between the fourth glass sheet 6 and the first glass sheet 3 are similar to the configurations of the spacer 41 and the first and second sealing materials 45, 40 arranged in the first hollow layer 10.

[0018] Next, the vacuum layer 30 is formed between the second glass sheet 4 and the third glass sheet 5, and the inside is at a lower pressure than the standard atmospheric pressure. Specifically, the second glass sheet 4 and the third glass sheet 5 are spaced apart in the thickness direction via a plurality of columnar spacers 46 arranged so as to be scattered along the surface direction of each of the main surfaces 4b and 5a. In addition, the second glass sheet 4 and the third glass sheet 5 are spaced apart in the thickness direction at the periphery via a vacuum layer sealing material 47. Then, during the manufacture of the double glazing 1, the gas in the internal space between the second glass sheet 4 and the third glass sheet 5 is discharged to the outside by a vacuum pump (not shown) to reduce the pressure inside, thereby forming the vacuum layer 30. The degree of vacuum of the vacuum layer 30 is not particularly limited, but may be a low vacuum such as 0.5 atmospheres, or a high vacuum such as 0.01 Pa.

[0019] The spacers 46 inside the vacuum layer 30 are arranged at a pitch of, for example, 10 to 100 mm. The shape, size, number, and arrangement pattern of the spacers 46 are not particularly limited and can be appropriately selected. The spacers 46 are formed of, for example, resin or metal.

[0020] The vacuum layer sealing material 47 seals the gap in the outer peripheral part of the vacuum layer 30. The vacuum layer sealing material 47 can be formed by heating and melting a glass adhesive. The glass adhesive contains, for example, a heat-fusible glass powder and a binder, and the binder is removed by heating the glass adhesive, the glass powder is melted, and the vacuum layer sealing material 47 may be formed of the melt.

[0021] Also, as shown in FIG. 3, in order to reduce the heat flux density in the spacer 41 in the first hollow layer 10 when heat transfer is performed between the first plate glass 3 and the third plate glass 5, with respect to the finding direction β orthogonal to the side direction at each side portion L1, L2, L3, L4 when the multilayer glass 1 is viewed in the thickness direction α, the relationship between the width A1 of the vacuum layer sealing material 47, the width B1 at the center in the thickness direction of the spacer, and the width B2 at the center in the thickness direction of the second sealing material 40 is set as A1 < B1 + B2. Thereby, as will be described later, the heat insulation performance of the window glass can be improved.

[0022] Also, with respect to the finding direction β, the inner peripheral end 48 of the vacuum layer sealing material 47 is located closer to the outer peripheral end E2 than the inner peripheral end E1 at the contact portion between the first sealing material 45 provided between the spacer 41 and the second plate glass 4 and the second plate glass 4. Further, the width A1 of the vacuum layer sealing material 47 can be 3 mm or more and less than 9 mm.

[0023] According to the above multilayer glass 1, the heat insulation performance of the window glass provided with the multilayer glass 1 can be improved. Specifically, with respect to the finding direction β, since the relationship of A1 < B1 + B2 is satisfied, the range in the finding direction of the portion where the spacer 41 in the first hollow layer 10 and the vacuum layer 30 overlap in the thickness direction α of the multilayer glass 1 (the range of the arrow γ in FIG. 3) becomes large. That is, the distance from the inner peripheral end of the spacer 41 to the vacuum layer sealing material 47 in the vacuum layer 30 becomes large. Thereby, the heat transfer suppression effect exerted by the vacuum layer 30 on the spacer 41 becomes large. For this reason, the heat flux density at the spacer 41 becomes small, and the linear heat transmittance rate particularly at the edge portion of the outer periphery of the multilayer glass 1 becomes small, thereby improving the heat insulation performance of the window glass provided with the multilayer glass 1.

[0024] In addition, in the viewing direction β, the inner peripheral end 48 of the vacuum layer sealing material 47 is located closer to the outer peripheral end E2 than the inner peripheral end E1 at the contact portion between the second glass sheet 4 and the first sealing material 45 provided between the spacer 41 and the second glass sheet 4. This increases the distance from the inner peripheral end E1 of the first sealing material 45, which serves as a heat conductor between the spacer 41 and the second glass sheet 4, to the vacuum layer sealing material 47. This increases the heat transfer suppression effect that the vacuum layer 30 has on the spacer 41, thereby further improving the thermal insulation performance of the window glass.

[0025] 1 to 3, the heat transfer simulation results showed that the heat flow density change point where the thermal insulation performance was poorest was near the contact part between the inner peripheral end 48 of the vacuum layer sealing material 47 and the third glass sheet 5, which corresponds to part C in Fig. 3. However, it was confirmed that the heat flux density at the heat flow density change point could be sufficiently reduced. Furthermore, it was confirmed from the above simulation results that the heat flux density at the spacer 41 could be reduced.

[0026] When the width in the find direction β of the vacuum layer sealing material 47 was 6 mm, the simulated linear heat transmittance of the window glass to which the insulating glass 1 was attached was 0.033 W / (m·K), which was small. The smaller the width in the find direction β of the vacuum layer sealing material 47 was, the smaller the linear heat transmittance could be, and when the width in the find direction β of the vacuum layer sealing material 47 was 3 mm, the linear heat transmittance was 0.031 W / (m·K). On the other hand, when the width in the find direction of the vacuum layer sealing material 47 was 10 mm, the linear heat transmittance was 0.041 W / (m·K).

[0027] Furthermore, in the embodiment of Figures 1 to 3, when the width A1 of the vacuum layer sealing material 47 is set to be 3 mm or more and less than 9 mm, it is possible to highly achieve both an improvement in the insulating performance of the window glass and an improvement in the adhesive strength between the vacuum layer sealing material 47 and the glass plates 4, 5 on both sides.

[0028] FIG. 4 shows the results of a simulation that determines the relationship between the width (finding width) A1 of the vacuum layer sealing material 47 in the find direction β, the heat insulating performance, adhesive strength, and sealing reliability of the double-glazed glass 1. The "adhesive strength" column shows the adhesive strength between the vacuum layer sealing material 47 and the glass sheets 4 and 5 on both sides. The "sealing reliability" column shows the sealing reliability in the vacuum layer 30. In the table of FIG. 4, a double circle indicates the highest level of performance, a circle indicates good performance or strength, and a triangle indicates a level where improvement in performance or strength is desired. From the simulation results of FIG. 4, it was confirmed that when the find width A1 of the vacuum layer sealing material 47 is 3 mm or more and less than 9 mm, the heat insulating performance of the window glass can be sufficiently increased, and the adhesive strength and sealing reliability of the vacuum layer sealing material 47 can be improved. On the other hand, when the find width A1 of the vacuum layer sealing material 47 is 10 mm, the heat insulating performance is lower than when the find width A1 is 9 mm or less. Furthermore, when the clearance width A1 of the vacuum layer sealing material 47 was 2.5 mm, the adhesive strength and sealing reliability of the vacuum layer sealing material 47 reached a level at which improvements were desired.

[0029] FIG. 5 is a diagram corresponding to FIG. 3 of a double-glazing unit 1a of a comparative example. In the comparative example, the relationship between the width A1 of the vacuum layer sealing material 47, the width B1 of the spacer 41 at the thickness direction center in the first hollow layer 10, and the width B2 of the second sealing material 40 at the thickness direction center in the viewing direction of the double-glazing unit 1a is A1>B1+B2. In this comparative example, there is no overlapping portion between the spacer 41 and the vacuum layer 30 in the thickness direction α of the double-glazing unit 1a. In this case, the entire spacer 41 and the vacuum layer sealing material 47 overlap in the thickness direction α, so the distance from the inner peripheral end of the spacer 41 to the vacuum layer sealing material 47 is reduced. This reduces the heat transfer suppression effect that the vacuum layer 30 exerts on the spacer 41. This increases the heat flux density in the spacer 41, and also increases the linear heat transmittance at the edge of the outer periphery of the double-glazing unit 1a. Therefore, the heat insulation performance of the window glass using the double-glazing unit 1a is lower than that of the embodiment of FIGS. 1 to 3. In the comparative example, the heat flow density conversion point with the poorest thermal insulation performance was the part D in Fig. 5 near the contact part between the inner peripheral end 48 of the vacuum layer sealing material 47 and the third glass sheet 5. The heat flux density at the heat flow density conversion point was greater than the heat flux density at the heat flow density conversion point of part C in Fig. 3, and the thermal insulation performance was deteriorated.

[0030] Fig. 6 is a diagram of a double-glazing glass 1b according to another embodiment, corresponding to Fig. 3. In the configuration of this example, a resin spacer 50 having the function of a first sealing material is provided in each of the hollow layers 10 and 11 instead of the spacer 41 (Figs. 2 and 3). The spacer 50 is made of a thermoplastic elastomer such as a styrene-based thermoplastic elastomer (TPS), and has a rectangular frame shape bonded to the main surfaces of the glass sheets 3, 4, and 6 on both sides. In each of the hollow layers 10 and 11, a second sealing material 40 is provided on the outer periphery side of the spacer 50.

[0031] In this example, the inner peripheral end 48 of the vacuum layer sealing material 47 may be located closer to the outer peripheral end F2 than the inner peripheral end F1 at the contact portion between the spacer 41 and the second glass sheet 4 in the viewing direction β. With this configuration, the distance from the inner peripheral end F1 of the spacer 41 to the vacuum layer sealing material 47 becomes large. Therefore, the heat transfer suppression effect that the vacuum layer 30 has on the spacer 41 becomes greater, and the heat insulating performance of the window glass can be further improved. In this example, the other configurations and functions are the same as those in Figs. 1 to 3.

[0032] In addition, in each of the above embodiments, the insulating glass 1, 1b includes the first to fourth glass sheets 3 to 6, but it is also possible to omit the fourth glass sheet 6 and have only one hollow layer. Also, the insulating glass may have three or more hollow layers and two or more vacuum layers. [Explanation of symbols]

[0033] Reference Signs List 1, 1a, 1b insulating glass, 2 group of glass sheets, 3 first glass sheet, 4 second glass sheet, 5 third glass sheet, 6 fourth glass sheet, 3a, 3b, 4a, 4b, 5a, 6a main surfaces, 10 first hollow layer, 11 second hollow layer, 30 vacuum layer, 40 second sealing material, 41 spacer, 42 spacer internal space, 43 through hole, 45 first sealing material, 46 spacer, 47 vacuum layer sealing material, 48 inner peripheral edge, 50 spacer.

Claims

1. a first glass sheet and a second glass sheet spaced apart by at least a first spacer; a third glass sheet spaced apart from the second glass sheet at an outer periphery thereof via a vacuum layer sealing material; a fourth glass sheet spaced apart from the first glass sheet via at least a second spacer; a first hollow layer formed between the first glass sheet and the second glass sheet and filled with a gas; a vacuum layer formed between the second glass sheet and the third glass sheet, the vacuum layer having a pressure lower than standard atmospheric pressure; a second hollow space formed between the first glass sheet and the fourth glass sheet and filled with a gas; a first hollow layer sealing material provided on the outer periphery of the first hollow layer, the first hollow layer being located on the outer periphery side of the first spacer; A second hollow layer sealing material is provided on an outer periphery of the second hollow layer, the second hollow layer being closer to the outer periphery than the second spacer. In order to reduce the heat flux density in the first spacer when heat is transferred between the first glass sheet and the third glass sheet, the relationship between the width A1 of the vacuum layer sealing material, the width B1 of the first spacer at the thickness direction center, and the width B2 of the first hollow layer sealing material at the thickness direction center is set to A1<B1+B2 in a direction perpendicular to the side direction of each side portion when the insulating glass is viewed in the thickness direction. Double glazing.

2. The insulating glass according to claim 1, The width A1 of the vacuum layer sealing material is 3 mm or more and less than 9 mm; Double glazing.

3. The insulating glass according to claim 1, Each of the first spacer and the second spacer is a composite of a resin and a metal. Insulating glass

4. The insulating glass according to claim 1, a hollow layer inner periphery sealing material provided between the first spacer and the second glass plate, the hollow layer inner periphery sealing material including an adhesive; In the detection direction, an inner peripheral end of the vacuum layer sealing material is located closer to an outer peripheral end of a contact portion between the hollow layer inner peripheral side sealing material and the second glass sheet than an inner peripheral end of the contact portion between the hollow layer inner peripheral side sealing material and the second glass sheet. Double glazing.

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