JP7557299B2 - Insulating glass modules, insulating glass units and glass windows - Google Patents

Description

The present invention relates to an insulating glass module, an insulating glass unit and a glass window having multiple glass panes.

In recent years, in buildings such as houses, highly insulating double-glazing units that can reduce the heating and cooling load are widely used. Patent Document 1 discloses a double-glazing module that includes a heat-resistant glass plate on the outside of the room, a Low-E glass plate on the inside of the room, and a spacer that is disposed between the heat-resistant glass plate and the Low-E glass plate to form an air gap between the two glass plates. The Low-E glass plate is a glass plate that is coated with a low-radiation special metal film to increase the reflectance in the infrared range that has thermal energy. When the Low-E glass plate is used as the glass plate on the inside of the double-glazing, the special metal film reflects the heat from the heating inside the room, improving the insulating performance.

In a double-glazing unit that has Low-E glass sheets, if a fire breaks out on the exterior side, the Low-E glass sheets reflect heat, which tends to cause the center of the glass sheet opposite the Low-E glass sheet (the glass on the fire side) to become very hot, leading to thermal cracking due to the temperature difference between the center and the periphery of the glass sheet. Therefore, for the glass sheet on the exterior side, which requires fire resistance, it is necessary to use a glass sheet with high surface compressive stress that can withstand the large temperature difference between the center and periphery, or to reduce the temperature difference between the center and periphery of the glass sheet.

Therefore, in the double-glazing unit shown in Patent Document 1, in order to reduce the temperature difference between the center and edge surfaces of the heat-resistant glass plate, a heat-conducting member is provided with one end in contact with the edge surface of the heat-resistant glass plate or the first surface on the outside of the room, and the other end in contact with the frame. With this configuration, heat is transferred from the frame, which has become hot due to a fire, to the edge surface or first surface of the heat-resistant glass plate via the heat-conducting member. This increases the temperature of the edge surface of the heat-resistant glass plate, which results in reducing the temperature difference between the center and peripheral parts of the heat-resistant glass plate, and prevents thermal cracking of the heat-resistant glass plate.

JP 2011-220029 A

In a double-glazing unit, the spacer that forms a gap between the heat-resistant glass plate and the non-heat-resistant glass plate (or non-tempered glass) that does not have a heat-resistant function can be made of metal such as aluminum or resin. If the spacer is made of metal, the U-value (heat transmission coefficient) of the double-glazing unit will be high, and the insulation performance will be reduced. However, if the spacer is made of metal, if a fire occurs on the side of the heat-resistant glass plate, heat will be smoothly transferred from the heat-resistant glass plate to the non-heat-resistant glass plate through the spacer. Therefore, the non-heat-resistant glass plate is heat-transferred by the spacer, and the temperature difference between the center and the periphery of the non-heat-resistant glass plate is less likely to occur. Therefore, the non-heat-resistant glass plate is less likely to crack due to heat, and the heat resistance performance of the double-glazing unit is improved. On the other hand, if the spacer is made of resin, the U-value (heat transmission coefficient) of the double-glazing unit will be low, and the insulation performance will be improved. However, because the spacers are made of resin, in the event of a fire occurring near the heat-resistant glass pane, heat is difficult to transfer from the heat-resistant glass pane to the non-heat-resistant glass pane via the spacer, and the temperature of the non-heat-resistant glass pane increases at the center where heat is transferred through the heated air gap, but the temperature of the periphery does not increase. As a result, a temperature difference occurs between the center and periphery of the non-heat-resistant glass pane, making it prone to thermal cracking. Therefore, in a double-glazing unit with a spacer made of resin, the heat resistance performance is reduced. As such, there is room for improvement in the double-glazing module in terms of achieving both thermal insulation performance and heat resistance performance.

In light of the above situation, there is a demand for double-glazing modules, double-glazing units, and glass windows that can suppress thermal cracking of glass panes while maintaining thermal insulation performance.

The characteristic configuration of the double-glazing module according to the present invention is a double-glazing module that faces a flame-shielding member and can be assembled to the flame-shielding member, and includes a first glass sheet having a first surface and a second surface provided on the back side of the first surface, a second glass sheet having a third surface facing the second surface and a fourth surface provided on the back side of the third surface, a spacer that is disposed on the periphery of the second surface and the third surface and forms a gap layer between the first glass sheet and the second glass sheet, and a heat-conducting member that extends adjacent to the fourth surface, the first glass sheet being formed of tempered glass, crystallized glass, or wire-reinforced glass, the periphery of the first surface and the fourth surface having a flame-shielding region that can be covered by the flame-shielding member, and the heat-conducting member having a thermal conductivity higher than that of the second glass sheet and disposed in at least a part of the flame-shielding region.

In a double-glazing module, the insulation may be increased by using a material with low thermal conductivity for the spacer. The spacer is usually provided in the flame-shielding area of the first glass sheet and the second glass sheet. In a double-glazing module, when a material with low thermal conductivity is used as the spacer, heat is not easily conducted from the first glass sheet to the second glass sheet through the spacer, so that the temperature rise of the peripheral part of the second glass sheet is suppressed, and the temperature difference between the center and the peripheral part of the second glass sheet becomes large. Here, when a fire breaks out in the compartment area facing the first surface of the first glass sheet, the non-flame-shielding area (center part) of the first glass sheet that is not covered by the flame-shielding member is directly exposed to the flame, and the flame-shielding area (periphery part) is not directly exposed to the flame due to the flame-shielding member. In addition, the second glass sheet is heated in its non-flame-shielding area by heat transfer through the heated air gap layer, and is also heated by near-infrared and infrared rays from the flame being irradiated to the second glass sheet. On the other hand, the flame-shielding area (periphery) covered by the flame-shielding member is less likely to heat up than the center of the second glass sheet because the flame-shielding member blocks infrared rays from the flame. Therefore, in the second glass sheet, the non-flame-shielding area (center) that is heated becomes hotter and the flame-shielding area (periphery) becomes colder, which generates thermal stress in the peripheral area that restrains the thermal expansion of the center, and there is a risk of thermal cracking of the second glass sheet. On the other hand, by using tempered glass, crystallized glass, or wire-reinforced glass for the first glass sheet, the first glass sheet can be made into a glass sheet with a large surface compressive stress that can withstand a large temperature difference between the center and the peripheral area. This allows the first glass sheet to effectively suppress thermal cracking.

Therefore, the double-glazing module of this configuration includes a heat-conducting member extending adjacent to the fourth surface of the second glass sheet, and the heat-conducting member has a higher thermal conductivity than that of the second glass sheet and is disposed in at least a part of the flame-shielding region at the periphery of the fourth surface. Therefore, heat is quickly conducted from the non-flame-shielding region (center) to the flame-shielding region (periphery) in the second glass sheet. As a result, when a fire occurs on the first surface side of the first glass sheet, the combustion heat is transferred from the center of the first glass sheet to the center of the second glass sheet through the gap layer, and is also transferred from the center of the second glass sheet to the periphery of the second glass sheet through the heat-conducting member. As a result, the temperature of the periphery of the second glass sheet rises and the temperature difference between the center and the periphery of the second glass sheet becomes smaller, making it difficult for the second glass sheet to thermally crack. In this way, the double-glazing module of this configuration can efficiently prevent thermal cracking of the second glass sheet in the event of a fire while maintaining thermal insulation performance.

Another characteristic feature is that the flame-blocking area is 10 mm to 30 mm from the end face of the first glass sheet or the second glass sheet.

According to this configuration, since the flame-shielding area is provided on the periphery of the glass sheet, the glass sheet can conduct heat from the center to the periphery via the heat-conducting member. As a result, thermal cracking is less likely to occur in the glass sheet. In addition, the overlap (insertion amount) of the glass sheet with respect to the flame-shielding member is stipulated to be 10 mm or more in the "Japan Architectural Standard Specifications for Construction Work and Commentary JASS17 Glass Work" (hereinafter referred to as JASS17). On the other hand, if the vertical length of the flame-shielding area exceeds 30 mm, the flame-shielding member inhibits heating of the periphery of the glass sheet, and the temperature difference between the center and periphery of the glass sheet becomes large, which makes the glass sheet more likely to crack due to thermal cracking. Therefore, the flame-shielding area of this configuration is configured to be 10 mm to 30 mm from the end face of the first glass sheet or the second glass sheet.

Another characteristic feature is that the thermal conductivity of the spacer is lower than the thermal conductivity of the second glass plate.

In the double-glazing module, a spacer is disposed between the first and second glass sheets, and the spacer forms an air gap between the first and second glass sheets. Here, the spacer is made of a material having a lower thermal conductivity than the second glass sheet, so that heat transfer from the first glass sheet to the second glass sheet through the spacer is reduced. This makes it possible to suppress heat transfer between the first and second glass sheets of the double-glazing glass, compared to a single-layer glass sheet. As a result, the double-glazing module can improve the thermal insulation performance. On the other hand, in such a double-glazing module, when the center of the second glass sheet is heated from the center of the first glass sheet through the air gap layer during a fire, the second glass sheet is likely to have a large temperature difference between the center and the periphery. However, in the double-glazing module, as described above, the heat conductive member extends to at least a part of the flame-shielding area at the periphery of the fourth surface of the second glass sheet, and the second glass sheet is configured to be easily heat-transferred from the center to the periphery. Therefore, in a double-glazing module with excellent thermal insulation performance, thermal cracking of the second glass sheet can be effectively suppressed.

Another characteristic feature is that the heat-conducting member is disposed on at least a portion of the end surface of the second glass plate.

According to this configuration, the heat conductive member is disposed on at least a portion of the edge surface as well as on the plate surface of the peripheral portion of the second glass plate, so that the heat of the center of the second glass plate, which is transferred from the center of the first glass plate through the air gap, is efficiently transferred to the edge surface of the second glass plate by the heat conductive member. This makes it easier for the temperature of the edge surface of the second glass plate to rise, so it is possible to further reduce the temperature difference between the center and the edge surface of the second glass plate. As a result, it is possible to reliably prevent thermal cracking in the edge surface, including the edge surface that is far from the center and where the temperature rise is slow, in the second glass plate.

Another characteristic feature is that the heat-conducting member is placed only in the flame-blocking area.

According to this configuration, the heat conductive member is placed only in the flame-shielding area, so that the heat conductive member is placed on the second glass sheet without being visible from the outside. This makes for a good appearance, and prevents thermal cracking of the second glass sheet without the heat conductive member affecting the appearance of the double-glazed module.

Another characteristic feature is that the heat-conducting member extends outside the flame-blocking area.

According to this configuration, since the heat conducting member extends to the outside of the flame-blocking region, in the event of a fire, heat received by the non-flame-blocking region (center) of the second glass plate through the gap layer from the first glass plate is easily transferred to the flame-blocking region (periphery) through the heat conducting member. This makes it possible to quickly reduce the temperature difference between the center and periphery of the second glass plate. In addition, by arranging the heat conducting member in a portion of the non-flame-blocking region of the second glass plate adjacent to the flame-blocking region, it is possible to reduce the range of the heat conducting member in the non-flame-blocking region and minimize the effect of the heat conducting member on the appearance of the second glass plate.

Another characteristic feature is that the heat conductive member is positioned so as not to come into contact with the first glass plate.

According to this configuration, the heat conductive member is arranged so as not to come into contact with the first glass plate, so that heat is not transferred between the first glass plate and the second glass plate via the heat conductive member. This makes it possible to reliably maintain the thermal insulation performance of the insulating glass module.

Another characteristic feature is that the heat conductive member is arranged so as to be in contact with the first glass plate.

According to this configuration, since the heat conductive member is arranged so as to be in contact with the first glass plate, heat can be transferred between the first glass plate and the second glass plate via the heat conductive member. Therefore, when a fire breaks out on the side of the first glass plate, the heat of the first glass plate can be transferred to the second glass plate by the heat conductive member, and the peripheral portion of the second glass plate can be heated. This reduces the temperature difference between the center and peripheral portion of the second glass plate in the event of a fire. As a result, the heat resistance performance of the insulating glass module can be improved.

Another characteristic feature is that the second glass plate is made of non-tempered glass or non-heat-resistant glass.

According to this configuration, the second glass plate is made of non-tempered glass or non-heat-resistant glass, which reduces the manufacturing cost of the second glass plate. In addition, since heat is transferred from the center to the periphery of the second glass plate by the heat-conducting member, the temperature difference between the center and periphery of the second glass plate is small in the event of a fire. As a result, the heat resistance performance of the insulating glass module can be improved.

Another characteristic configuration is that the linear heat transmittance α (W/(m·K)) of a member provided between the first glass plate and the second glass plate in the flame-shielding region is in the range of the following formula:
[Number 1]
((1140/R)-755)/24805≦α<0.042
R: the ratio of the fire resistance time of a second glass plate having a thickness of d (mm) in a fire resistance test by heating from the side of the first glass plate to the fire resistance time of a second glass plate having a thickness of 3 mm, which is set to 1, and is calculated by the following formula.
[Number 2]
R=0.0044d ² -0.0108d+0.9923

According to this configuration, the double-glazing module can satisfy the standard set in the fire test (fire resistance time of 20 minutes or more) by setting the linear heat transmission coefficient α (W/(m·K)) of the member provided across the first and second glass sheets in the flame-blocking area to be equal to or greater than [((1140/R)-755)/24805]. Furthermore, by setting the linear heat transmission coefficient α to less than 0.042 (W/(m·K)), the double-glazing module can improve its thermal insulation performance because heat is less likely to be transferred from the first glass sheet to the second glass sheet. To improve the thermal insulation performance of the double-glazing module, the linear heat transmission coefficient α is preferably equal to or less than 0.03 (W/(m·K)), and more preferably equal to or less than 0.02 (W/(m·K)).

A characteristic configuration of the insulating glass module according to the present invention is a insulating glass module that faces a flame-shielding member and can be assembled to the flame-shielding member,
A first glass plate having a first surface and a second surface provided on a back side of the first surface;
a second glass plate having a third surface opposite to the second surface and a fourth surface provided on a back side of the third surface;
a spacer disposed on a peripheral portion of the second surface and the third surface to form a gap layer between the first glass plate and the second glass plate,
The first glass plate is made of tempered glass, crystallized glass, or wire-reinforced glass,
The first surface and the fourth surface have peripheral portions each having a flame-shielding area that can be covered by the flame-shielding member,
The linear heat transmittance α (W/(m·K)) of a member provided across the first glass plate and the second glass plate in the flame-shielding region is in the range of the following formula:
[Number 3]
((1200/R)-755)/24805≦α<0.042
R: the ratio of the fire resistance time of a second glass plate having a thickness of d (mm) in a fire resistance test by heating from the side of the first glass plate to the fire resistance time of a second glass plate having a thickness of 3 mm, which is set to 1, and is calculated by the following formula.
[Number 4]
R=0.0044d ² -0.0108d+0.9923

According to this configuration, the double-glazing module can satisfy the standard set in the fire test (fire resistance time of 20 minutes or more) by setting the linear heat transmission coefficient α (W/(m·K)) of the member provided across the first and second glass sheets in the flame-blocking area to be equal to or greater than [(1200/R-755)/24805]. Furthermore, by setting the linear heat transmission coefficient α to less than 0.042 (W/(m·K)), the double-glazing module can improve its thermal insulation performance because heat transfer from the first glass sheet to the second glass sheet is made difficult. To improve the thermal insulation performance of the double-glazing module, the linear heat transmission coefficient α is preferably equal to or less than 0.03 (W/(m·K)), and more preferably equal to or less than 0.02 (W/(m·K)).

Another characteristic feature is that the heat-conducting member extends from the end face of the first glass plate to the end face of the second glass plate, and the heat-conducting member has a higher thermal conductivity than the thermal conductivity of the second glass plate.

According to this configuration, a heat-conducting member is provided from the end surface of the first glass sheet to the end surface of the second glass sheet, and the heat-conducting member has a higher heat conductivity than that of the second glass sheet. Therefore, the heat-conducting member quickly conducts heat from the flame-shielding area (periphery) of the first glass sheet to the flame-shielding area (periphery) of the second glass sheet. As a result, when a fire occurs on the first surface side of the first glass sheet, the combustion heat is transferred from the center of the first glass sheet to the center of the second glass sheet through the gap layer, and from the peripheral part of the first glass sheet to the peripheral part of the second glass sheet through the heat-conducting member. As a result, the temperature of the peripheral part of the second glass sheet rises and the temperature difference between the center and the peripheral part of the second glass sheet becomes smaller, making it difficult for the second glass sheet to thermally crack. In this way, the double-glazing module of this configuration can efficiently prevent thermal cracking of the second glass sheet in the event of a fire.

Another characteristic feature is that the flame-blocking area is 10 mm to 30 mm from the end face of the first glass sheet or the second glass sheet.

According to this configuration, since the flame-shielding area is provided on the periphery of the glass sheet, the glass sheet can conduct heat from the center to the periphery via the heat-conducting member. As a result, thermal cracking is less likely to occur in the glass sheet. In addition, the overlap (insertion amount) of the glass sheet with respect to the flame-shielding member is stipulated to be 10 mm or more in the "Japan Architectural Standard Specifications for Construction Work and Commentary JASS17 Glass Work" (hereinafter referred to as JASS17). On the other hand, if the vertical length of the flame-shielding area exceeds 30 mm, the flame-shielding member inhibits heating of the periphery of the glass sheet, and the temperature difference between the center and periphery of the glass sheet becomes large, which makes the glass sheet more likely to crack due to thermal cracking. Therefore, the flame-shielding area of this configuration is configured to be 10 mm to 30 mm from the end face of the first glass sheet or the second glass sheet.

Another characteristic feature is that the third surface further includes a heat conduction suppression film that suppresses heat conduction in the plate surface direction of the second glass plate.

According to this configuration, since the third surface of the second glass plate is provided with a heat conduction suppression film, the heat conduction suppression film can suppress the temperature rise of the second glass plate as a whole. This allows the temperature rise of the second glass plate as a whole to be slow, so that the temperature difference between the center and the periphery of the second glass plate can be reduced. As a result, thermal cracking of the second glass plate can be suppressed.

Another characteristic feature is that the heat conduction suppression film is a heat ray reflecting film.

According to this configuration, when the second glass plate is heated from the first glass plate through the air gap layer, the heat ray reflecting film on the third surface of the second glass plate reflects the heat rays radiated from the first glass plate. As a result, the second glass plate is prevented from absorbing the heat rays radiated from the first glass plate, and the heat transfer from the first glass plate to the second glass plate can be suppressed. This allows the second glass plate to slow down the temperature rise as a whole, thereby reducing the temperature difference between the center and the periphery of the second glass plate and suppressing thermal cracking of the second glass plate.

Another characteristic feature is that the heat ray reflective film includes a metal layer.

According to this configuration, since the heat ray reflecting film contains a metal layer, the metal layer easily transfers heat in the plate surface direction. Therefore, when the second glass plate is heated from the first glass plate through the air gap layer, the second glass plate can efficiently transfer heat from the center to the periphery through the heat ray reflecting film. This makes it possible to effectively suppress thermal cracking of the second glass plate.

Another characteristic feature is that the thermal conductivity of the heat conduction suppression film is lower than the thermal conductivity of the second glass plate.

According to this configuration, the thermal conductivity of the heat conduction suppression film is lower than that of the second glass plate, so the presence of the heat conduction suppression film can further suppress the temperature rise of the second glass plate. This causes the temperature rise of the second glass plate as a whole to be slower, so the temperature difference between the center and the periphery of the second glass plate can be reduced. As a result, thermal cracking of the second glass plate can be more effectively suppressed.

Another characteristic feature is that the corners of the end faces of the second glass plate are not chamfered.

In this configuration, the corners of the end face of the second glass sheet are not chamfered, and so cracks may exist at the corners. This makes the second glass sheet susceptible to thermal cracking. However, in the double-glazing module of this configuration, the heat-conducting member extends over at least a portion of the flame-blocking area on the periphery of the fourth surface of the second glass sheet, thereby reducing the temperature difference between the center and periphery of the second glass sheet, and thus effectively suppressing thermal cracking of the second glass sheet.

Another characteristic feature is that the flame-blocking area is 10 mm to 30 mm from the end faces of the first glass sheet and the second glass sheet.

The Japanese Architectural Standard Specifications for Construction Works and Commentary JASS17 Glass Construction (hereinafter referred to as JASS17) stipulates that the overlap (insertion amount) of the glass sheet over the flame-blocking member must be 10 mm or more. On the other hand, if the vertical length of the flame-blocking area exceeds 30 mm, the flame-blocking member will prevent the peripheral part of the second glass sheet from being heated, and the temperature difference between the center and the peripheral part of the second glass sheet will become large, making the glass sheet more susceptible to thermal cracking. Therefore, the flame-blocking area of this configuration is configured to be 10 mm to 30 mm from the edge faces of the first and second glass sheets.

Another characteristic feature is that the thickness of the second glass plate is 2 mm or more and 10 mm or less.

By making the thickness of the second glass plate between 2 mm and 10 mm as in this configuration, it is possible to improve the thermal insulation provided by the second glass plate while increasing the strength of the second glass plate. This allows the double glazing module to have improved both thermal insulation performance and heat resistance performance.

The glass unit according to the present invention is characterized in that it comprises a double-glazing module having the above-mentioned configuration, and a flame-blocking member that faces the first glass sheet and the second glass sheet and clamps the peripheral portions of the first glass sheet and the second glass sheet with a thermal insulating material interposed therebetween.

The double-glazing unit of this configuration includes a flame-shielding member that sandwiches the peripheral portions of the first and second glass sheets with the insulating material interposed therebetween, so that heat transfer to the first and second glass sheets through the flame-shielding member can also be suppressed. This allows the double-glazing unit to further improve its thermal insulation performance. On the other hand, in such a double-glazing unit, the insulating material makes it difficult for the internal temperature of the flame-shielding member to rise, so that in the event of a fire, the second glass sheet is likely to have a large temperature difference between the center and the peripheral portion. However, in the double-glazing unit of this configuration, as described above, the heat-conducting member extends to the peripheral portion of the fourth surface of the second glass sheet or the end surfaces of the first and second glass sheets, so that the second glass sheet is easily configured to transfer heat from its center portion or the first glass sheet to its peripheral portion. Therefore, in the double-glazing unit of this configuration, thermal cracking of the second glass sheet can also be effectively suppressed.

The characteristic feature of the glass window according to the present invention is that the double-glazed glass module having the above-mentioned configuration is clamped and fixed to the flame-blocking member.

The glass window of this configuration can suppress thermal cracking of the glass panes while maintaining its insulating performance by using a double-glazing module that is clamped and fixed between flame-blocking members.

FIG. 2 is a front view of the glass unit according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 . FIG. 2 is an exploded view of the glass unit according to the first embodiment. FIG. FIG. 11 is a partial cross-sectional view of a glass unit according to a second embodiment. FIG. 11 is a partial cross-sectional view of a glass unit according to a third embodiment. FIG. 10 is a partial cross-sectional view of a glass unit according to a fourth embodiment. FIG. 13 is a partial cross-sectional view of a glass unit according to a fifth embodiment. FIG. 13 is a partial cross-sectional view of a glass unit according to a sixth embodiment. FIG. 23 is a partial cross-sectional view of a glass unit according to a seventh embodiment. 1 is a table showing examples and comparative examples of Test 3. 4 is a graph showing the relationship between the thickness of the second glass plate, the linear heat transmittance, and the fire resistance time. 1 is a graph showing the relationship between the thickness of the second glass plate and the fire resistance time. FIG. 11 is a partial cross-sectional view of a glass unit according to another embodiment.

[First embodiment]
A first embodiment of an insulating glass module 10 according to the present invention will be described with reference to Figures 1 to 4. Figure 2 shows a completed insulating glass unit (hereinafter referred to as "glass unit") 100, and Figure 3 shows the glass unit 100 in a state prior to assembly. The glass unit 100 comprises an insulating glass module (hereinafter referred to as "glass module") 10, an elastic support 24 (an example of a thermal insulating material), and a flame blocking member 20. The glass module 10 comprises insulating glass 1 and a heat conductive member 41, which will be described later.

As shown in FIG. 2, the double-glazed glass 1 is composed of a first glass sheet 11, a second glass sheet 12, and a spacer 13 disposed between the first glass sheet 11 and the second glass sheet 12. The spacer 13 forms an air gap layer 5 between the first glass sheet 11 and the second glass sheet 12. In this embodiment, the spacer 13 is composed of a spacer material 14 and a sealant 15. The spacer material 14 is made of resin. The sealant 15 is located on the outer periphery side of the double-glazed glass 1 relative to the spacer material 14 and blocks the flow of the air gap layer 5 and the outside air. The first glass sheet 11 is heat-resistant glass having a first surface 31 and a second surface 32 provided on the back side of the first surface 31. The second glass sheet 12 is Low-E glass having a third surface 33 facing the second surface 32 of the first glass sheet 11 and a fourth surface 34 provided on the back side of the third surface 33. In this embodiment, the first surface 31 of the first glass plate 11 is disposed on the exterior side.

1 and 2, the insulating glass 1 is rectangular with four peripheral edges 8, and is fitted and fixed to a flame-shielding member 20 having a recess along the peripheral edge 8. The flame-shielding member 20 is composed of a frame 21. The insulating glass 1 faces the flame-shielding member 20 and is configured to be assembled to the flame-shielding member 20. In this embodiment, the frame 21 is a fixed frame for a sash having a recess. The thermal conductivity of the frame 21 is 20 W/m·K or more and 250 W/m·K or less. A setting block 22 having a protective function for the end surface 4 of the insulating glass 1 is installed on the bottom surface of the recess of the frame 21 into which the four sides of the insulating glass 1 are fitted. The end surface 4 of the insulating glass 1 includes the end surface 16 of the first glass sheet 11, the sealant 15, and the end surface 17 of the second glass sheet 12. The setting blocks 22 only need to be installed in several places at the bottom end of the insulating glass 1 so that they can sufficiently distribute and support the weight of the insulating glass 1; they do not need to be installed over the entire area of the four sides of the insulating glass 1.

In order to fix the insulating glass 1 to the frame 21, a backup material 23 is provided between the insulating glass 1 and the frame 21. Furthermore, an elastic support 24 (an example of a heat insulating material) is provided between the insulating glass 1 and the frame 21. This also suppresses heat transfer to the first glass sheet 11 and the second glass sheet 12 through the flame-shielding member 20. As a result, the glass unit 100 can further improve the heat insulating performance. The elastic support 24 is disposed on the peripheral portion 8 of the first glass sheet 11 and the second glass sheet 12, and when the insulating glass 1 does not have a sealant 15, it can also block the flow of the air gap layer 5 and the outside air. In this way, the insulating glass 1 is configured to be sandwiched between the frame 21 (flame-shielding member 20) via the elastic support 24. As a result, the gap between the insulating glass 1 and the frame 21 (flame-shielding member 20) is filled by the elastic support 24.

The double-glazed glass 1 has a flame-shielding area 2 that can be covered by the frame body 21 in the peripheral portion 8 along the four sides of the first surface 31 and the fourth surface 34, and a non-flame-shielding area 3 that is visible from the outside and is not covered by the flame-shielding member 20. As shown in FIG. 1, the double-glazed glass 1 is configured in a rectangular shape, and the flame-shielding area 2 is provided in the peripheral portion 8 of the four sides. Here, the flame-shielding area 2 means a plate surface of the first surface 31 or the fourth surface 34 where the flame is blocked by the frame body 21 when the first surface 31 or the fourth surface 34 of the double-glazed glass 1 is exposed to flame from a direction perpendicular to the plate surface. In other words, the flame-shielding area 2 is an area projected orthogonally from the flame-shielding member 20 onto the first glass sheet 11 or the second glass sheet 12. It is preferable that this flame-shielding area 2 is 10 mm to 30 mm from the end surface 4 of the double-glazed glass 1. JASS17 specifies that the overlap (insertion amount) of the double-glazed glass 1 over the flame-blocking member 20 must be 10 mm or more. On the other hand, if the vertical length of the flame-blocking region 2 exceeds 30 mm, the flame-blocking member 20 will prevent the peripheral portion 8 of the double-glazed glass 1 from being heated, and the temperature difference between the center portion 7 and the peripheral portion 8 of the double-glazed glass 1 will increase, making the double-glazed glass 1 more susceptible to thermal cracking.

The first glass plate 11 can be made of fire-resistant glass, for example, tempered glass, crystallized glass, or wire-reinforced glass. This allows the first glass plate 11 to be a glass plate with a large surface compressive stress that can withstand a large temperature difference between the center portion 7 and the peripheral portion 8. As a result, the first glass plate 11 can effectively suppress thermal cracking. Furthermore, as shown in FIG. 2, the corners of the end surface 16 of the first glass plate 11 are polished into a curved shape to reduce the risk of breakage during transportation or assembly. That is, the corners of the end surface 16 of the first glass plate 11 are chamfered. On the other hand, the corners of the end surface 17 of the second glass plate 12 may not be chamfered from the perspective of cost. If the corners of the end surface 17 of the second glass plate 12 are not chamfered, cracks may exist at the corners. For this reason, the second glass plate 12 is prone to thermal cracking. However, in the glass module 10 of this embodiment, the heat conductive member 41 extends to at least a portion of the flame-blocking region 2 in the peripheral portion 8 of the fourth surface 34 of the second glass sheet 12, thereby reducing the temperature difference between the center 7 and the peripheral portion 8 of the second glass sheet 12, effectively preventing thermal cracking of the second glass sheet 12 and reducing the cost of chamfering the corners.

The second glass plate 12 is made of non-strengthened glass or non-heat-resistant glass. Here, non-strengthened glass or non-heat-resistant glass refers to, for example, ordinary soda glass that is not chemically strengthened (heat-resistant), physically strengthened (heat-resistant), or "wired." The second glass plate 12 preferably has a thickness of 2 mm or more and 10 mm or less, and more preferably has a thickness of 4 mm or more. By making the thickness of the second glass plate 12 a predetermined thickness or more, the strength of the second glass plate 12 can be increased while improving the thermal insulation provided by the second glass plate 12. This allows the glass module 10 to have improved both thermal insulation performance and heat resistance performance.

[Heat conduction suppression film]
The second glass plate 12 is provided on the third surface 33 with a heat conduction suppressing film 12a that suppresses heat conduction in the plate surface direction of the second glass plate 12. The heat conduction suppressing film 12a can suppress the temperature rise of the second glass plate 12 as a whole. This can slow down the temperature rise of the second glass plate 12 as a whole, thereby making it possible to reduce the temperature difference between the central portion 7 and the peripheral portion 8 of the second glass plate 12. As a result, thermal cracking of the second glass plate 12 can be suppressed.

In this embodiment, the heat conduction suppression film 12a is a heat ray reflecting film, and is coated on the surface of the third surface 33. If a heat ray reflecting film is present on the third surface 33 as the heat conduction suppression film 12a, when the second glass plate 12 is heated from the first glass plate 11 through the air gap layer 5, the second glass plate 12 is heated from the first glass plate 11 through the heat ray reflecting film. In this case, the heat ray reflecting film on the third surface 33 reflects the heat rays radiated from the first glass plate 11, so that the second glass plate 12 is suppressed from absorbing the heat rays radiated from the first glass plate 11. This makes it possible to suppress heat transfer from the first glass plate 11 to the second glass plate 12. As a result, the heat insulation performance of the glass module 10 can be improved.

The heat ray reflecting film as the heat conduction suppressing film 12a may be a Low-E film containing a metal layer. When the heat ray reflecting film contains a metal layer, the metal layer easily transfers heat in the plate surface direction. Therefore, when the second glass plate 12 is heated from the first glass plate 11 through the air gap layer 5, the second glass plate 12 can efficiently transfer heat from the center portion 7 to the peripheral portion 8 through the heat ray reflecting film. This can effectively suppress thermal cracking of the second glass plate 12. In addition, since the heat ray reflecting film has a metal layer, it is possible to suppress the radiation of heat in the second glass plate 12. This can also improve the thermal insulation performance of the glass module 10. The thickness of the metal layer is preferably 5 nm to 15 nm, and more preferably 5 nm to 10 nm.

The heat ray reflective film (Low-E film) may be a multilayer film formed by laminating two or more layers selected from a metal layer, a metal oxide layer, a metal nitride layer, and a metal oxynitride layer. A suitable example of the metal layer is a silver layer. A suitable example of the metal oxide layer is a tin oxide layer, a titanium oxide layer, or a zinc oxide layer. A suitable example of the metal nitride layer is silicon nitride. A suitable example of the metal oxynitride layer is silicon oxynitride. The heat ray reflective film is preferably formed by a vacuum film deposition method such as physical vapor deposition (PVD), and in particular, the sputtering method is preferred because it can form a film uniformly over a large area.

[Heat Conductive Material]
The insulating glass 1 includes a heat conductive member 41 extending adjacent to the peripheral portion 8 of the first surface 31 and the peripheral portion 8 of the fourth surface 34. The heat conductive member 41 has a thermal conductivity higher than that of the second glass plate 12 and is configured to be arranged in at least a part of the flame-shielding region 2. That is, the heat conductive member 41 may be arranged in the entire flame-shielding region 2 or in a part of the flame-shielding region 2. In the example of FIG. 2, the heat conductive member 41 is arranged in a continuous state from the first surface 31 to the fourth surface 34, and is arranged in the entire flame-shielding region 2. In this embodiment, the heat conductive member 41 is formed in a sheet shape and is fixed in a state of surface contact with the first surface 31 and the fourth surface 34 of the flame-shielding region 2. Here, the surface contact state means that the heat conductive member 41 faces the first surface 31 and the fourth surface 34 of the flame-shielding region 2, and as long as the majority (e.g., 80% or more of the area) of the heat conductive member 41 contacts the first surface 31 and the fourth surface 34 of the flame-shielding region 2, a portion of the heat conductive member 41 may be in a non-contact state. The thermal conductivity of the second glass plate 12 made of soda glass is generally less than 1 (W/(m·K)). On the other hand, the thermal conductivity of the heat conductive member 41 is preferably 50 (W/(m·K)) or more. As the heat conductive member 41, for example, a metal or alloy such as Sn, Al, Ag, Cu, or Zn can be used. The thermal conductivity of Sn is 64 (W/(m·K)), the thermal conductivity of Al is 204 (W/(m·K)), the thermal conductivity of Ag is 418 (W/(m·K)), the thermal conductivity of Cu is 372 (W/(m·K)), and the thermal conductivity of Zn is 113 (W/(m·K)).

In this way, the heat conductive member 41 extends adjacent to the peripheral portion 8 (flame shielding region 2) of the first surface 31 and the fourth surface 34, so that heat is quickly conducted from the non-flame shielding region 3 to the flame shielding region 2 in the double-glazed glass 1. As a result, for example, if a fire occurs on the side of the first surface 31 on the outdoor side of the double-glazed glass 1, the combustion heat is conducted to the non-flame shielding region 3 of the first glass sheet 11 of the double-glazed glass 1 exposed to the outdoor side, and is also conducted from the non-flame shielding region 3 of the first glass sheet 11 to the non-flame shielding region 3 of the second glass sheet 12 through the gap layer 5. The heat conducted to the non-flame shielding region 3 of the second glass sheet 12 is conducted to the flame shielding region 2 of the second glass sheet 12 through the heat conductive member 41. As a result, the temperature of the flame shielding region 2 in the second glass sheet 12 rises, the temperature difference between the non-flame shielding region 3 and the flame shielding region 2 becomes smaller, and the thermal cracking phenomenon is less likely to occur.

The heat conductive member 41 in this embodiment is provided from the first surface 31 and the fourth surface 34 of the double-glazed glass 1 to the end surface 4. The heat conductive member 41 is arranged on at least a part of the end surface 4 of the double-glazed glass 1. That is, the heat conductive member 41 may be arranged on the entire end surface 4 of the double-glazed glass 1, or on a part of the end surface 4. In the example of FIG. 2, the heat conductive member 41 is arranged on the entire end surface 4 of the double-glazed glass 1. As a result, the heat of the central portion 7 of the double-glazed glass 1, which is directly exposed to the flame in the event of a fire, is efficiently transferred to the end surface 4 of the peripheral portion 8 by the heat conductive member 41. As a result, the temperature of the end surface 4 of the double-glazed glass 1 is easily increased, making it possible to further reduce the temperature difference between the central portion 7 and the peripheral portion 8 of the double-glazed glass 1. Therefore, in the double-glazed glass 1, it is possible to reliably prevent thermal cracking in the peripheral portion 8 of the double-glazed glass 1, including the end surface 4, which is far from the central portion 7 and where the temperature rise is slow.

The heat conducting member 41 is arranged only in the flame-shielding region 2 of the flame-shielding region 2 and non-flame-shielding region 3 of the double-glazing glass 1. In other words, since the heat conducting member 41 does not extend into the non-flame-shielding region 3, the heat conducting member 41 is arranged on the double-glazing glass 1 without being visible from the outside. This makes for a good appearance, and prevents thermal cracking of the double-glazing glass 1 without the heat conducting member 41 affecting the appearance of the double-glazing glass 1.

In this embodiment, the heat conducting member 41 is disposed over the entire flame-shielding region 2 covered by the flame-shielding member 20 (the height is from the end surface 4 to the upper end surface of the flame-shielding member 20). With this configuration, in the event of a fire, heat is transferred from the center 7 (non-flame-shielding region 3) of the double-glazed glass 1, which has become hot due to the heat of combustion of the fire, to the peripheral portion 8 (flame-shielding region 2) via the heat conducting member 41. As a result, the temperature of the peripheral portion 8 of the double-glazed glass 1, which is not directly exposed to the flame due to the flame-shielding member 20, rises quickly, and the temperature difference between the center 7 and the peripheral portion 8, which become very hot due to the heat of combustion of the fire, is reduced, preventing thermal cracking of the double-glazed glass 1 and improving the heat resistance of the double-glazed glass 1.

4, the thermal conductive member 41 is, for example, a tape body with excellent thermal conductivity, and includes a metal foil 42 and an adhesive layer 43. The adhesive layer 43 has an adhesive 44 and thermally conductive fine particles 45. When the thermal conductive member 41 is a tape body, it is easy to adhere to the surface of the double-glazed glass 1, so that improvement in thermal conductivity can be expected. Also, as shown in FIG. 3, in the glass module 10, if the double-glazed glass 1 is prepared in a state in which the thermal conductive member 41 is attached to the peripheral portion 8 and the end surface 4 of the double-glazed glass 1, it is preferable because the thermal conductive member 41 is easily attached and the thermal conductive member 41 protects the end surface 4. In other words, as shown in FIG. 3, the glass module 10 in which the thermal conductive member 41 is fixed to the double-glazed glass 1 is inserted into the frame body 21 in which the setting block 22 and the backup material 23 are housed, and the elastic support body 24 is fitted into the gap between the glass module 10 and the frame body 21 to complete the glass unit 100, which makes assembly easy. The heat conductive member 41 may be provided only in those parts of the insulating glass 1 where thermal cracking is likely to occur, but to ensure heat resistance, it is preferable to provide it around the entire periphery of the insulating glass 1 (the four peripheral edges 8).

In this embodiment, the heat conducting member 41 is configured not to come into contact with the frame 21 of the flame shielding member 20. Because the heat conducting member 41 does not come into contact with the frame 21, the heat conducting member 41 does not require dimensional accuracy in the direction perpendicular to the plate surface of the insulating glass 1. Therefore, taking into account the specifications of the insulating glass 1 and the thermal conductivity of the heat conducting member 41, the thickness, etc. of the heat conducting member 41 can be easily adjusted within a dimensional range that is equal to or smaller than the gap between the insulating glass 1 and the frame 21.

The heat conductive member 41 preferably has a higher absorptivity for near-infrared rays (wavelength 0.7 μm to 2.5 μm) than the second glass plate 12, and particularly preferably has a higher absorptivity for near-infrared rays with a wavelength of 2.5 μm than the second glass plate 12. This absorptivity is preferably 0.1 or more with respect to a maximum value of 1, and more preferably 0.2 or more. When the frame body 21 is heated during a fire, the radiant heat generated from the frame body 21 may be propagated by the near-infrared rays. However, since the second glass plate 12 transmits near-infrared rays, the temperature rise of the peripheral portion 8 of the second glass plate 12 is unlikely to occur due to the radiant heat from the frame body 21. Therefore, in this embodiment, the absorptivity of the near-infrared rays of the heat conductive member 41 is made higher than that of the second glass plate 12. In addition, the thermal conductivity of the frame body 21 in this embodiment is set to 20 (W/(m·K)) or more. As a result, the peripheral portion 8 of the second glass plate 12 can easily receive radiant heat from the frame body 21 through the heat conductive member 41, and the temperature difference between the center portion 7 and the peripheral portion 8 of the second glass plate 12 can be reduced more quickly by raising the temperature of the peripheral portion 8 of the second glass plate 12. In addition, the emissivity of the heat conductive member 41 is preferably 0.1 or more with respect to a maximum value of 1, and more preferably 0.2 or more. This makes it possible to suppress heat loss caused by the radiant heat of the frame body 21 being reflected by the heat conductive member 41, and therefore allows the radiant heat to be efficiently transferred to the flame-shielding area 2 via the heat conductive member 41.

The heat conducting member 41 may be configured with fine irregularities on the surface of the metal foil 42. If the surface of the metal foil 42 has fine irregularities, the surface reflection of radiant heat in the metal foil 42 is suppressed, so that the metal foil 42 can easily absorb radiant heat. As a result, the heat conducting member 41 can efficiently receive radiant heat from the flame shielding member 20 as well, and heat the peripheral portion 8 of the insulating glass 1.

The metal foil 42 provided in the heat conducting member 41 has a thermal conductivity of 50 (W/(m·K)) or more, preferably 100 (W/(m·K)) or more. If the thermal conductivity of the metal foil 42 is 50 (W/(m·K)) or more, the thermal conductivity of the heat conducting member 41 can also be increased to 50 W/mK or more. This allows heat from the center 7 of the double-glazed glass 1 to be quickly transferred to the peripheral portion 8 of the double-glazed glass 1 via the heat conducting member 41, and the peripheral portion 8 can be heated quickly. In order to increase the thermal conductivity of the heat conducting member 41, it is more preferable that the thermal conductivity of the metal foil 42 is 100 (W/(m·K)) or more.

The metal foil 42 is composed of metals or alloys such as Sn, Al, Ag, Cu, and Zn, and contains at least one of Sn, Al, Ag, Cu, and Zn at 50% by weight or more. The thermal conductivity of Sn is 64 (W/(m·K)), the thermal conductivity of Al is 204 (W/(m·K)), the thermal conductivity of Ag is 418 W/m·K, the thermal conductivity of Cu is 372 (W/(m·K)), and the thermal conductivity of Zn is 113 (W/(m·K)). In other words, Sn, Al, Ag, Cu, and Zn all have a thermal conductivity of 50 (W/(m·K)) or more. Therefore, by the metal foil 42 containing at least one of the above-mentioned metals at 50% by weight or more, the thermal conductivity of the heat conductive member 41 can be easily increased. Of Sn, Al, Ag, Cu, and Zn, Zn is the most preferable because it has an anticorrosive effect that does not allow moisture, oxygen, etc., which cause corrosion, to pass through.

The adhesive 44 is either acrylic, silicone, or natural rubber based. This makes it easy to form the adhesive layer 43 in the heat conductive member 41.

The thermal conductivity of the thermally conductive microparticles 45 is higher than that of the adhesive 44. This allows the thermally conductive member 41 to increase the thermal conductivity of the adhesive layer 43 by using the thermally conductive microparticles 45.

The adhesive layer 43 contains 50% to 90% by weight of thermally conductive fine particles 45, preferably 60% to 80% by weight. In this way, the thermally conductive member 41 can ensure both thermal conductivity and adhesiveness in the adhesive layer 43. If the thermally conductive fine particles 45 are less than 50% by weight in the adhesive layer 43, the adhesive layer 43 cannot obtain sufficient thermal conductivity. If the thermally conductive fine particles 45 are more than 90% by weight in the adhesive layer 43, the proportion of the adhesive 44 becomes too low, reducing the adhesive strength and making the thermally conductive member 41 more likely to peel off from the insulating glass 1.

The adhesive layer 43 has a thickness of 10 μm or more and 100 μm or less, preferably 20 μm or more and 90 μm or less. When the adhesive layer 43 has a thickness of 10 μm or more and 100 μm or less, the heat conductive member 41 can ensure both the thermal conductivity and adhesiveness of the adhesive layer 43. In the heat conductive member 41, if the thickness of the adhesive layer 43 is less than 10 μm, peeling may occur due to the difference in thermal expansion between the metal foil 42 and the double-glazed glass 1 during a fire. On the other hand, if the thickness of the adhesive layer 43 exceeds 100 μm, the thermal conductivity of the heat conductive member 41 including the adhesive layer 43 may be reduced due to the large influence of the adhesive 44. Since the adhesive layer 43 includes the adhesive 44 having a lower thermal conductivity than the metal foil 42, it is preferable that the thickness of the adhesive layer 43 is smaller than the thickness of the metal foil 42. For example, if the thickness of the metal foil 42 is 100 μm, the thickness of the adhesive layer 43 can be set to 30 to 50 μm. In this way, the adhesive layer 43 can be set to a thickness approximately half that of the metal foil 42.

The thermally conductive particles 45 contained in the adhesive layer 43 have an average particle diameter of 10 μm or more and 100 μm or less, preferably 20 μm or more and 90 μm or less. When the particle diameter of the thermally conductive particles 45 is 10 μm or more and 100 μm or less, the thermal conductive member 41 can reliably ensure thermal conductivity in the adhesive layer 43. When the particle diameter of the thermally conductive particles 45 is less than 10 μm, the thermally conductive particles 45 are unevenly arranged in the adhesive layer 43, so that uniform thermal conductivity may not be ensured. On the other hand, when the particle diameter of the thermally conductive particles 45 exceeds 100 μm, the surface area of the thermally conductive particles 45 becomes small, so that the thermal conductivity of the thermal conductive member 41 may be reduced. It is preferable that the particle diameter of the thermally conductive particles 45 is equal to or less than the thickness of the adhesive layer 43. As shown in FIG. 4, in this embodiment, the thermal conductive member 41 is configured so that the particle diameter of the thermally conductive particles 45 and the thickness of the adhesive layer 43 are the same.

The thermally conductive microparticles 45 are metal microparticles. When the thermally conductive microparticles 45 are metal microparticles, thermal conductivity can be reliably imparted to the adhesive layer 43. The metal microparticles are composed of metals or alloys such as Sn, Al, Ag, Cu, and Zn, and contain 50% by weight or more of at least one of Sn, Al, Ag, Cu, and Zn. In this way, the thermal conductivity of the adhesive layer 43 can be easily increased.

Of the metal microparticles Sn, Al, Ag, Cu, and Zn, Sn, Zn, and Al, which have low melting points, are preferred. When using metal microparticles with low melting points, even if the adhesive 44 is exposed to the heat of combustion during a fire and its adhesiveness is reduced, the adhesion between the insulating glass 1 and the adhesive layer 43 can be ensured by melting the surface of the metal microparticles. Furthermore, the metal microparticles contained in the adhesive layer 43 may be composed of only one type of metal, or metal microparticles of different metals may be mixed.

The backup material 23 and the elastic support 24 are members for supporting the double-glazing 1 on the frame 21, and are therefore made of resin or rubber with a certain degree of elasticity so as not to damage the double-glazing 1. The backup material 23 and the elastic support 24 are made of resin or rubber with high thermal insulation properties, and heat conduction from the center 7 of the double-glazing 1, which has become hot due to a fire, to the backup material 23 and the elastic support 24 via the heat conductive member 41 is suppressed. As a result, the heat transmitted to the peripheral portion 8 of the double-glazing 1 via the heat conductive member 41 increases, so the peripheral portion 8 can be efficiently heated and the heat resistance performance can be more reliably improved. In addition, in order to suppress the escape of heat from the heat conductive member 41 to the setting block 22 and efficiently raise the temperature of the peripheral portion 8 of the double-glazing 1, it is desirable for the setting block 22 to also be made of a material with high thermal insulation properties.

A glass window installed in a building or the like is realized by clamping and fixing a glass module 10 to a flame-blocking member 20.

[Second embodiment]
A second embodiment of the glass unit 100 will be described with reference to Fig. 5. The same members as those in the first embodiment are denoted by the same reference numbers, and the description thereof will be omitted here.

5, the heat conductive member 41 may be configured to be arranged in the non-flame shielding area 3 on the fourth surface 34 of the second glass plate 12. In other words, the heat conductive member 41 may extend to the outside of the flame shielding area 2. According to this embodiment, the heat received by the non-flame shielding area 3 of the second glass plate 12 from the first glass plate 11 through the gap layer 5 during a fire is easily transferred to the flame shielding area 2 through the heat conductive member 41. As a result, the second glass plate 12 can quickly reduce the temperature difference between the center portion 7 (non-flame shielding area 3) and the peripheral portion 8 (flame shielding area 2). As a result, the heat resistance performance of the second glass plate 12 in the glass module 10 can be improved. In this embodiment, the heat conductive member 41 is also arranged in the flame shielding area 2 and the non-flame shielding area 3 on the first surface 31 of the first glass plate 11. Therefore, even in the first glass sheet 11, the temperature difference between the central portion 7 (non-flame shielding region 3) and the peripheral portion 8 (flame shielding region 2) can be quickly reduced. In addition, the heat conductive member 41 is arranged in a portion of the non-flame shielding region 3 of the first glass sheet 11 and the second glass sheet 12 adjacent to the flame shielding region 2, thereby making it possible to reduce the range of the heat conductive member 41 in the non-flame shielding region 3 and minimize the effect of the heat conductive member 41 on the appearance of the double-glazed glass 1. Although not shown, the heat conductive member 41 may be arranged in the flame shielding region 2 and the non-flame shielding region 3 only on one side of the fourth surface 34 of the second glass sheet 12.

[Third embodiment]
A third embodiment of the glass unit 100 will be described with reference to Fig. 6. The same members as those in the first embodiment are designated by the same reference numbers, and the description thereof will be omitted here.

As shown in FIG. 6, in this embodiment, the heat conductive members 41 are individually arranged on the first surface 31 and the end surface 16 of the first glass sheet 11 and the fourth surface 34 and the end surface 17 of the second glass sheet 12, and are not provided on the outer surface of the spacer 13. That is, the heat conductive members 41 arranged on the second glass sheet 12 are provided in a state where they are not in contact with the first glass sheet 11. Therefore, in this embodiment, the first glass sheet 11 and the second glass sheet 12 can transfer heat from the center 7 to the peripheral portion 8 by the heat conductive members 41 arranged on each of them. This makes it possible to reduce the temperature difference between the center 7 and the peripheral portion 8 in the first glass sheet 11 and the second glass sheet 12 of the double-glazing 1, and improve the heat resistance performance of the glass module 10.

In addition, the heat conductive member 41 is arranged in a discontinuous state between the first glass plate 11 and the second glass plate 12, so that heat is not transferred between the first glass plate 11 and the second glass plate 12 via the heat conductive member 41. This allows the glass module 10 of this embodiment to maintain its thermal insulation performance.

[Fourth embodiment]
A fourth embodiment of the glass unit 100 will be described with reference to Fig. 7. The same members as those in the first embodiment are denoted by the same reference numbers, and the description thereof will be omitted here.

As shown in FIG. 7, in this embodiment, the heat conductive member 41 is provided only on the fourth surface 34 (flame blocking area 2) of the second glass sheet 12 of the double glazing 1 and on the end surface 17 of the second glass sheet 12, and is not provided on the first glass sheet 11. Even with this configuration, the second glass sheet 12 can transfer heat from the center portion 7 heated during a fire to the peripheral portion 8 including the end surface 17 via the heat conductive member 41. This makes it possible to reduce the temperature difference between the center portion 7 and the peripheral portion 8 of the second glass sheet 12. As a result, the heat resistance of the second glass sheet 12 in the glass module 10 can be improved.

[Fifth embodiment]
A fifth embodiment of the glass unit 100 will be described with reference to Fig. 8. The same members as those in the first embodiment are denoted by the same reference numbers, and the description thereof will be omitted here.

As shown in FIG. 8, in this embodiment, the heat conductive member 41 is provided only on the peripheral portion 8 (flame-shielding region 2) of the fourth surface 34 of the double-glazing 1, and is not provided on the end surface 17. Even with this configuration, the heat of the center portion 7 of the second glass sheet 12, which has been heated to a high temperature through the gap layer 5 from the first glass sheet 11 that has received the heat of combustion of a fire, can be transferred to the peripheral portion 8 of the second glass sheet 12, including the end surface 17, through the heat conductive member 41 arranged in the flame-shielding region 2. This makes it possible to reduce the temperature difference between the center portion 7 and the peripheral portion 8 in the second glass sheet 12 of the double-glazing 1, and improve the heat resistance of the second glass sheet 12.

Sixth Embodiment
A sixth embodiment of the glass unit 100 will be described with reference to Fig. 9. The same members as those in the first embodiment are designated by the same reference numbers, and the description thereof will be omitted here.

9, in this embodiment, the heat conductive member 41 is not disposed on the fourth surface 34 of the second glass plate 12, but is disposed from the end surface 16 of the first glass plate 11 to the end surface 17 of the second glass plate 12. That is, the heat conductive member 41 is disposed on the end surface 16, the sealant 15, and the end surface 17. According to this embodiment, heat can be transferred from the first glass plate 11 heated in the event of a fire to the flame-shielding region 2 of the second glass plate 12 via the heat conductive member 41. This allows the second glass plate 12 to quickly reduce the temperature difference between the center portion 7 (non-flame-shielding region 3) and the peripheral portion 8 (flame-shielding region 2). As a result, the heat resistance of the second glass plate 12 in the glass module 10 can be improved.

[Seventh embodiment]
A seventh embodiment of the glass unit 100 will be described with reference to Fig. 10. The same members as those in the first embodiment are denoted by the same reference numbers, and the description thereof will be omitted here.

As shown in FIG. 10, in this embodiment, the heat conductive member 41 is disposed on the fourth surface 34 of the second glass plate 12 and is disposed from the end surface 16 of the first glass plate 11 to the end surface 17 of the second glass plate 12. That is, the heat conductive member 41 is disposed on the end surface 16, the sealant 15, and the end surface 17. According to this embodiment, heat can be transferred from the first glass plate 11 heated in the event of a fire to the flame-shielding area 2 of the second glass plate 12 via the heat conductive member 41. Furthermore, the heat transferred to the non-flame-shielding area 3 of the second glass plate 12 can be transferred to the flame-shielding area 2 of the second glass plate 12 via the heat conductive member 41. As a result, the second glass plate 12 can more quickly reduce the temperature difference between the center portion 7 (non-flame-shielding area 3) and the peripheral portion 8 (flame-shielding area 2). As a result, the heat resistance of the second glass plate 12 in the glass module 10 can be further improved.

[Fireproofing test]
(Test 1)
A fire test was conducted to verify the heat resistance performance of the glass module 10 of the above embodiment. As a comparison, a conventional double-glazing module not provided with a heat-conducting member 41 (hereinafter referred to as "Comparative Example 1") was prepared. Example 1 has the same configuration as the glass module 10 shown in FIG. 2 (first embodiment), and the heat-conducting member 41 is disposed from the flame-shielding region 2 of the first surface 31 of the first glass sheet 11 through the end surface 4 to the flame-shielding region 2 of the fourth surface 34 of the second glass sheet 12. Example 2 has the same configuration as the glass module 10 shown in FIG. 6 (third embodiment), and the heat-conducting member 41 is disposed only on the fourth surface 34 and the end surface 16 of the second glass sheet 12.

The double-glazed glass 1 has a first glass plate 11 made of wire-reinforced heat-resistant glass having a thickness of 6.8 mm, a gap layer 5 having a thickness of 12 mm, and a second glass plate 12 made of Low-E glass having a thickness of 3 mm, and has a gap layer 5 having a thickness of 12 mm between the first glass plate 11 and the second glass plate 12. In the spacer 13, the spacer material 14 is made of resin, and the seal material 15 is made of silicone. The frame 21 is made of iron, the backup material 23 is made of flame-retardant resin, the elastic support 24 is made of fireproof silicone seal material, and the setting block 22 is a fireproof block made of calcium silicate. The heat-conducting member 41 used in Examples 1 and 2 is an aluminum tape with the metal foil 42 being aluminum foil. The heat-conducting member 41 in Example 1 has a thickness of 0.1 mm (metal foil 42: 50 μm, adhesive layer 43: 50 μm). The thermal conductive member 41 in Example 2 has a thickness of 0.2 mm (metal foil 42: 100 μm, adhesive layer 43: 100 μm).

The fire resistance test assumed a fire breaking out on the side of the first glass sheet 11 of the double-glazing glass 1 (the side of the first surface 31). The furnace temperature T was raised in accordance with the ISO-834 heating curve shown below, and the time until the second glass sheet 12 of the double-glazing glass 1 broke was measured.
ISO-834 heating curve: T = 345log(8t+1)+20 t: Heating time (min)

When a fire test was conducted under the above conditions, in Comparative Example 1, the second glass plate 12 broke 13 minutes and 45 seconds after heating began, whereas in Example 1, the second glass plate 12 broke 20 minutes and 10 seconds after heating began, and in Example 2, the second glass plate 12 broke 14 minutes and 52 seconds after heating began.

In Examples 1 and 2, when a fire breaks out on the side of the first glass sheet 11 of the insulating glass 1, the central portion 7 of the first glass sheet 11 becomes hot due to the fire, and the central portion 7 of the second glass sheet 12 is heated from the central portion 7 of the first glass sheet 11 through the air gap layer 5, and heat is transferred from the central portion 7 of the second glass sheet 12, which has become hot, to the peripheral portion 8 through the heat conductive member 41. As a result, the temperature of the peripheral portion 8 of the second glass sheet 12 rises, and the temperature difference between the central portion 7, which becomes very hot due to the heat of combustion of the fire, and the peripheral portion 8 is smaller than in the comparative example.

On the other hand, in Comparative Example 1, since the thermally conductive member 41 is not provided in the insulating glass 1, the end surface 17 of the second glass sheet 12 cannot be actively heated. As a result, in the insulating glass 1, the temperature difference between the central portion 7 of the second glass sheet 12, which becomes hot due to the heat of the first glass sheet 11, and the peripheral portion 8 of the second glass sheet 12, which is less susceptible to the heat of the first glass sheet 11, is larger than in Examples 1 and 2.

The above fire test results show that Examples 1 and 2 have better heat resistance than Comparative Example 1. When the test results are examined, it is believed that the superior heat resistance of Examples 1 and 2 is due to the characteristic configuration in which the heat conductive member 41 is provided from the end surface 17 of the second glass sheet 12 of the insulating glass 1 to the fourth surface 34 of the flame blocking area 2.

The second glass plate 12 of the insulating glass 1 can improve its fireproof performance by increasing the surface compressive stress. However, if the second glass plate 12, in addition to the first glass plate 11, is also made of tempered glass with increased surface compressive stress, the cost of the insulating glass 1 will be high. In addition, if the second glass plate 12, which is Low-E glass, is made of tempered glass, the color tone of the Low-E glass may change. In addition, since there are places in the opening of a building where fireproof window glass is required and places where it is not required, tempered Low-E glass and non-tempered Low-E glass are mixed, which is not aesthetically pleasing for the entire building. For the above reasons, it is preferable not to use tempered glass for the second glass plate 12. In light of this situation, it has become clear that the second glass plate 12, which has a relatively low surface compressive stress, can be used for the fireproof glass module 10 by arranging the heat conductive member 41 on the fourth surface 34 of the insulating glass 1.

(Test 2)
In Example 3, the first glass plate 11 is tempered glass having a thickness of 6.5 mm, and other conditions are the same as those in Example 1. In Example 4, the first glass plate 11 is tempered glass having a thickness of 5 mm, and the second glass plate 12 is Low-E glass having a thickness of 4 mm, and other conditions are the same as those in Example 1. In Example 5, the first glass plate 11 is tempered glass having a thickness of 5 mm, and the heat conductive member 41 has a thickness of 0.4 mm (metal foil 42: 0.2 mm, adhesive layer 43: 0.2 mm), and other conditions are the same as those in Example 1.

When a fire test was conducted under the above conditions, in Example 3, the second glass plate 12 broke 20 minutes and 13 seconds after heating began, in Example 4, the second glass plate 12 broke 20 minutes and 50 seconds after heating began, and in Example 5, the second glass plate 12 broke 21 minutes and 26 seconds after heating began.

The above fire test results show that Examples 3 to 5 also have better heat resistance than Comparative Example 1. When the test results are examined, it is believed that the reason why Example 4 has better heat resistance than Example 3 is that the increased thickness of the second glass plate 12 increases the strength of the glass and increases the specific heat of the second glass plate 12. The increased specific heat of the second glass plate 12 reduces the temperature difference between the center 7 and the peripheral portion 8 of the second glass plate 12. It is also believed that the reason why Example 5 has better heat resistance than Example 3 is that the increased thickness of the heat conductive member 41 allows heat to be transferred more quickly from the center 7 to the peripheral portion 8 of the second glass plate 12.

(Test 3)
A fire resistance test was carried out for Examples 6 to 10 and Comparative Examples 2 and 3 shown in the table of FIG.
The first glass plate 11 is a tempered glass having a thickness of 6.5 mm. The second glass plate 12 is a Low-E glass. In Comparative Example 2 and Example 10, the second glass plate 12 has a thickness of 2 mm, 3 mm, 4 mm, 5 mm, and 8 mm. In Example 8, the second glass plate 12 has a thickness of 3 mm and 5 mm. In Examples 6 to 9 and Comparative Example 3, the second glass plate 12 has a thickness of 3 mm. In the spacer 13, the spacer material 14 is made of resin, and the seal material 15 is made of silicone. The thermal conductivity of the spacer material 14 is 0.24 (W/(m·K)), and the thermal conductivity of the seal material 15 is 0.5 (W/(m·K)). In contrast, the thermal conductivity of the second glass plate 12 is 0.75 (W/(m·K)). Therefore, the thermal conductivity of the spacer 13 (spacer material 14, seal material 15) is lower than that of the second glass plate 12.

Comparative Example 2 and Comparative Example 3 are double-glazed glass that do not include a heat-conducting member 41. In Comparative Example 3, the spacer material 14 is made of aluminum. Example 6 has the same configuration as the glass module 10 shown in FIG. 8 (fifth embodiment), and the heat-conducting member 41 is arranged only on the fourth surface 34 of the second glass surface. Examples 7, 8, and 10 have the same configuration as the glass module 10 shown in FIG. 9 (sixth embodiment), and the heat-conducting member 41 is arranged only in the region extending from the end surface 16 of the first glass sheet 11 to the end surface 17 of the second glass sheet 12. Example 9 has the same configuration as the glass module 10 shown in FIG. 10 (seventh embodiment), and the heat-conducting member 41 is arranged in the region extending from the end surface 16 of the first glass sheet 11 to the end surface 17 of the second glass sheet 12 and on the fourth surface 34 of the second glass surface.

The heat conductive member 41 placed on the end surface 4 of the insulating glass 1 is zinc tape in Examples 7 to 9, and aluminum tape in Example 10. The heat conductive member 41 placed on the fourth surface 34 of the second glass plate 12 is aluminum tape in both Examples 6 and 10. The linear heat transmittance can be obtained by calculating and adding up the products of the thermal conductivity and thickness of the spacer material 14, the sealant 15, and the heat conductive member 41 placed between the first glass plate 11 and the second glass plate 12.

When the fire resistance test was performed under the above conditions, in Comparative Example 2, the second glass plate 12 cracked 13 minutes 18 seconds after the start of heating when the second glass plate 12 was 3 mm, 13 minutes 33 seconds after the start of heating when the second glass plate 12 was 4 mm, and 13 minutes 57 seconds after the start of heating when the second glass plate 12 was 5 mm. In Example 6, the second glass plate 12 cracked 14 minutes 12 seconds after the start of heating, and in Example 7, the second glass plate 12 cracked 17 minutes 20 seconds after the start of heating. In Example 8, the second glass plate 12 cracked 18 minutes 47 seconds after the start of heating when the second glass plate 12 was 3 mm, and 19 minutes 24 seconds after the start of heating when the second glass plate 12 was 5 mm. In Example 9, the second glass plate 12 cracked 20 minutes 10 seconds after the start of heating. In Example 10, the second glass plate 12 cracked 20 minutes 13 seconds after the start of heating when the second glass plate 12 was 3 mm, 20 minutes 36 seconds after the start of heating when the second glass plate 12 was 4 mm, and 21 minutes 14 seconds after the start of heating when the second glass plate 12 was 5 mm. In Comparative Example 3, the second glass plate 12 cracked 30 minutes 00 seconds after the start of heating.

The above fire test results show that the heat resistance performance of Examples 6 to 10 is superior to that of Comparative Example 2. When the test results are examined, it is believed that the reason why the heat resistance performance is superior as the thickness of the second glass plate 12 in Example 10 increases is that the strength of the glass increases and the heat capacity of the second glass plate 12 increases as the thickness of the second glass plate 12 increases. When the heat capacity of the second glass plate 12 increases, the temperature difference between the center 7 and the peripheral portion 8 of the second glass plate 12 decreases. In addition, the heat resistance performance is superior in order from Example 6 to Example 10. It is believed that the linear heat transmittance increases, and heat is transferred quickly from the first glass plate 11 to the peripheral portion 8 of the second glass plate 12. In Comparative Example 3, although the fire test results are good, the linear heat transmittance becomes too high because the spacer material 14 is made of metal (aluminum), so the insulating effect of the insulating glass 1 is reduced.

In this way, in the double-glazed glass 1, because there are components (spacer material 14, sealant 15, heat conductive member 41) arranged from the first glass sheet 11 to the second glass sheet 12 in the flame-blocking region 2, the heat of the first glass sheet 11 can be transferred to the peripheral portion 8 of the second glass sheet 12 via these components. Therefore, when the sum of the linear heat transmittances of these components (spacer material 14, sealant 15, heat conductive member 41) increases, the temperature of the peripheral portion of the second glass sheet increases in proportion to the linear heat transmittance, and it is believed that the temperature difference between the center 7 and peripheral portion 8 of the second glass sheet 12 can be reduced.

FIG. 12 is a graph showing the relationship between the thickness of the second glass plate 12, the linear heat transmittance, and the fire resistance time. The fire resistance time (seconds) when the thickness of the second glass plate 12 is 3 mm is shown by a solid line, and the fire resistance time (seconds) when the thickness of the second glass plate 12 is 5 mm is shown by a dashed line. In either case, the linear heat transmittance and the fire resistance time are proportional to each other. In the graph of FIG. 12, the slope of the solid line and the intersection point between the solid line and the vertical axis (Y axis) can be obtained from the solid line. Using the slope and intersection point of these solid lines, the linear heat transmittance of the members (spacer material 14, sealant 15, heat conductive member 41) provided between the first glass plate 11 and the second glass plate 12 in the flame-shielding region 2 is defined as α (W/(m·K)), and the fire resistance time Tt3 (seconds) when the thickness of the second glass plate 12 is 3 mm can be derived as the following formula 5. Therefore, the fire resistance time Tt3 (seconds) can be calculated using the following formula 5.
[Number 5]
Tt3=24805α+755

Here, we consider the relationship between the thickness (d (mm)) of a glass plate and its fire resistance. The heat capacity of a glass plate can be calculated by specific heat x area x thickness (d (mm)). When the heat capacity of a glass plate increases due to an increase in the thickness (d (mm)) of the glass plate, the temperature of the heated center portion is less likely to rise in inverse proportion to the thickness. Furthermore, as the thickness (d) of the glass plate increases, heat is more easily conducted in the surface direction (e.g., from the center to the periphery) inside the glass plate. From the above, it is considered that the fire resistance obtained by increasing the thickness of the glass plate improves by about the square of the thickness of the glass plate from the viewpoint of heat capacity and heat conduction.

FIG. 13 is a graph showing the relationship between the thickness of the second glass plate 12 and the fire resistance time ratio. In FIG. 12, the vertical axis shows the ratio R of the fire resistance time Tt when the fire resistance time Tt3 (seconds) when the thickness of the second glass plate 12 is 3 mm is set to 1. That is, the ratio R is expressed as a ratio when the fire resistance time of the second glass plate 12 having a plate thickness of d (mm) in a fire resistance test by heating from the side of the first glass plate 11 is set to 1 when the fire resistance time of the second glass plate 12 having a plate thickness of 3 mm is set to 1. The ratio R of the fire resistance time Tt when the linear heat transmittance α is 0.019 (W/(m·K)) can be derived from the curve of the graph in FIG. 13 as the following formula 6. Therefore, the ratio R can be calculated using the following formula 6.
[Number 6]
R=0.0044d ² -0.0108d+0.9923

As shown by the solid line, the resistance increases with an increase in the thickness of the second glass plate 12. By defining the thickness of the second glass plate 12 as d (mm) from the solid line, the fire resistance time Tt (seconds) associated with a change in the thickness of the second glass plate 12 can be calculated by the following formula 7, using the fire resistance time Tt3 (seconds) when the thickness of the second glass plate 12 is 3 mm as a reference.
[Number 7]
Tt=(0.0044d ² -0.0108d+0.9923)×Tt3

Here, the heat capacity of the second glass plate 12 can be calculated by specific heat x area x thickness (d (mm)). When the heat capacity of the second glass plate 12 increases due to an increase in the thickness (d (mm)) of the second glass plate 12, the temperature of the heated center portion 7 is less likely to rise in inverse proportion to the thickness. This reduces the temperature difference between the center portion 7 and the peripheral portion 8 of the second glass plate 12. In addition, as the thickness (d (mm)) of the second glass plate 12 increases, heat is more easily transferred from the center portion 7 to the peripheral portion 8 inside the second glass plate 12. Therefore, as shown in FIG. 13, the thickness (d (mm)) of the second glass plate 12 and the fire resistance time Tt are considered to be correlated by a quadratic function.

In the above formula 7, by substituting the fire resistance time Tt3 (seconds) based on the above formula 5, the fire resistance time Tt (seconds) of the second glass plate 12 can be calculated from the following formula 8 using the thickness d (mm) and linear heat transmittance α (W/m·K) of the second glass plate 12.
[Number 8]
Tt=(0.0044d ² -0.0108d+0.9923)×(24805α+755)

Here, the legally prescribed time for the fire resistance test is 20 minutes.
Therefore, it is preferable that the glass module 10 has a Tt of 1200 (seconds) or more, as shown in the following formula 9.
[Number 9]
Tt=(0.0044d ² -0.0108d+0.9923)×(24805α+755)≧1200

Therefore, a preferred range of linear heat transmittance α (W/(m·K)) for the glass module 10 can be derived using the following formula 10 based on the above formulas 6 and 9.
[Number 10]
α≧((1200/R)-755)/24805

In order to improve the thermal insulation performance of the insulating glass 1, it is preferable that the linear heat transmission coefficient α is smaller than 0.042 (W/(m·K)), which is the linear heat transmission coefficient when the spacer material 14 is made of aluminum (Comparative Example 3). Therefore, it is preferable that the linear heat transmission coefficient α (W/(m·K)) is within the range of the following formula 11.
[Number 11]
((1200/R)-755)/24805≦α<0.042

The glass module 10 can meet the standard time set for the fire test (fire resistance time to pass the fire test: 20 minutes) by setting the linear heat transmission coefficient α (W/(m·K)) in the direction from the first glass plate 11 to the second glass plate 12 of the member provided from the first glass plate 11 to the second glass plate 12 in the flame-shielding region 2 to be equal to or greater than [((1200/R)-755)/24805]. Furthermore, by setting the linear heat transmission coefficient α to less than 0.042 (W/(m·K)), which is the linear heat transmission coefficient when the aluminum spacer material 14 is used (Comparative Example 3), the glass module 10 can improve its insulation performance because heat is less likely to be transferred from the first glass plate 11 to the second glass plate 12. To improve the thermal insulation performance of the glass module 10, the linear heat transmission coefficient α is preferably 0.03 (W/(m·K)) or less, and more preferably 0.02 (W/(m·K)) or less.

The above formula (11) is for a condition where the heat conductive member 41 is not disposed on the fourth surface 34 of the second glass plate 12. Example 6 differs from Comparative Example 2 only in that the heat conductive member 41 is disposed on the fourth surface 34 of the second glass plate 12. Example 9 differs from Example 8 only in that the heat conductive member 41 is disposed on the fourth surface 34 of the second glass plate 12. Example 6 has a fire resistance time that is longer by 60 seconds or more than Comparative Example 2, and Example 9 also has a fire resistance time that is longer by 60 seconds or more than Example 8.

Therefore, in glass module 10 in which thermally conductive member 41 is disposed on fourth surface 34 of second glass plate 12, in the above formula 9, 1200 (seconds), which is the reference time set for the fire test (fire resistance time for passing the fire test: 20 minutes), can be replaced with 1140 (=1200-60) (seconds). That is, in glass module 10 in which thermally conductive member 41 is disposed on fourth surface 34 of second glass plate 12, linear heat transmittance α (W/(m·K)) is preferably within the range of the following formula 12.
[Number 12]
((1140/R)-755)/24805≦α<0.042

In the glass module 10 in which the heat-conducting member 41 is disposed on the fourth surface 34, the linear heat transmission coefficient α (W/(m·K)) in the direction from the first glass plate 11 to the second glass plate 12 of the member provided from the first glass plate 11 to the second glass plate 12 in the flame-shielding region 2 is set to be equal to or greater than [(1140/R-755)/24805], thereby satisfying the standard set for the fire test (fire resistance time of 20 minutes or more). Furthermore, by setting the linear heat transmission coefficient α to less than 0.042 (W/(m·K)), which is the linear heat transmission coefficient when the aluminum spacer material 14 is used (Comparative Example 3), the glass module 10 is less susceptible to heat transfer from the first glass plate 11 to the second glass plate 12, and therefore the thermal insulation performance can also be improved. To improve the thermal insulation performance of the glass module 10, the linear heat transmission coefficient α is preferably 0.03 (W/(m·K)) or less, and more preferably 0.02 (W/(m·K)) or less.

[Other embodiments]
(1) In the above embodiment, the heat conduction suppression film 12a disposed on the third surface 33 of the second glass plate 12 is a heat ray reflective film, but the heat conduction suppression film 12a may be a film body with a hollow structure having high thermal insulation performance. In the above embodiment, the heat ray reflective film as the heat conduction suppression film 12a includes a metal layer, but the heat ray reflective film may be a film that does not include a metal layer. The heat ray reflective film can be formed in a form that does not include a metal layer by being configured, for example, by a dielectric multilayer film. In addition, the thermal conductivity of the heat conduction suppression film 12a may be lower than the thermal conductivity of the second glass plate 12. In this way, the presence of the heat conduction suppression film 12a can further suppress the temperature rise of the second glass plate 12. As a result, the temperature rise of the second glass plate 12 becomes slower as a whole, so that the temperature difference between the center portion 7 and the peripheral portion 8 of the second glass plate 12 can be reduced. As a result, the thermal cracking of the second glass plate 12 can be more effectively suppressed.

(2) In the above embodiment, an example was shown in which a heat conduction suppression film 12a was placed on the third surface 33 of the second glass plate 12, but a configuration in which a heat conduction suppression film 12a is not placed on the third surface 33 of the second glass plate 12 may also be used.

(3) In the above embodiment, an example was shown in which the first surface 31 of the first glass plate 11 in the glass module 10 is arranged on the outdoor side. Alternatively, the fourth surface 34 of the second glass plate 12 may be arranged on the outdoor side.

(4) In the above embodiment, an example was given in which the glass module 10 includes a heat conductive member 41 on the fourth surface 34 of the second glass plate 12, or from the end surface 16 of the first glass plate 11 to the end surface 17 of the second glass plate 12. However, if the linear heat transmittance α falls within the range of the above formula 12 due to the spacer material 14 and the sealing material 15, the heat conductive member 41 does not need to be included.

(5) In the above embodiment, the heat conductive member 41 is arranged around the entire circumference of the peripheral portion 8 of the insulating glass 1 in the glass module 10, but the heat conductive member 41 may be arranged at intervals in the circumferential direction of the peripheral portion 8 of the insulating glass 1. For example, the heat conductive member 41 may be arranged only on the upper and lower sides of the four sides of the insulating glass 1. Even if the heat conductive member 41 is arranged on the four sides of the peripheral portion 8 of the insulating glass 1, the heat conductive member 41 may not be arranged at the corner where two sides intersect. In addition, in the above embodiment, the heat conductive member 41 is arranged over the entire flame-shielding region 2 corresponding to the height direction of the frame body 21, but the heat conductive member 41 may be arranged only in a part of the flame-shielding region 2 adjacent to the end face 4, for example.

(6) The flame-blocking area 2 in the above embodiment may be provided in a shape that crosses the central portion of the insulating glass 1 in addition to the peripheral portion 8 of the insulating glass 1, and is set appropriately according to the shape of the frame 21 of the insulating glass 1. Furthermore, the flame-blocking area 2 only needs to be configured by at least a part of the first surface 31 and the fourth surface 34 of the insulating glass 1 that are covered by the flame-blocking member 20. In other words, the frame 21 may be shaped so as not to cover the end surface 4 of the insulating glass 1.

(7) In the above embodiment, an example was shown in which the frame 21 of the flame-blocking member 20 was a fixed frame of the sash, but the frame 21 is not limited to being a fixed frame of the sash, and may have other configurations, such as a pair of L-shaped angles.

(8) In the above embodiment, an example was shown in which the flame-blocking member 20 includes a backup material 23 and an elastic support 24, but as shown in FIG. 14, the flame-blocking member 20 may be composed of only a frame body 21.

(9) In the above embodiment, an example was shown in which the heat conductive member 41 was disposed on the first surface 31, the fourth surface 34, and the end surface 4 of the insulating glass 1, but the heat conductive member 41 may also be fixed in contact with at least one of the second surface 32 of the first glass plate 11 and the third surface 33 of the second glass plate 12.

In any of the embodiments, the configuration of the heat conductive member 41 is not limited to that shown in Figures 1 to 13. In other words, other configurations can be used as long as the heat conductive member 41 is present on the second glass sheet 12 of the insulating glass 1 when the glass unit 100 is completed.

The present invention can be applied to insulating glass modules and insulating glass units that include multiple glass panes.

1: Double-glazing glass 2: Flame-shielding region 3: Non-flame-shielding region 4, 16, 17: End surface 5: Air gap layer 7: Central portion 8: Peripheral portion 10: Double-glazing module (glass module)
Reference Signs List 11: First glass plate 12: Second glass plate 12a: Thermal conduction suppressing film 13: Spacer 20: Flame blocking member 21: Frame 23: Back-up material 24: Elastic support 31: First surface 32: Second surface 33: Third surface 34: Fourth surface 41: Thermal conduction member 100: Insulating glass unit R: Ratio Tt: Fire resistance time Tt3: Fire resistance time d: Thickness of second glass plate α: Linear heat transmittance

Claims (21)

A double glazing module that faces a flame-blocking member and can be attached to the flame-blocking member,
A first glass plate having a first surface and a second surface provided on a back side of the first surface;
a second glass plate having a third surface opposite to the second surface and a fourth surface provided on a back side of the third surface;
a spacer disposed on a peripheral portion of the second surface and the third surface to form a gap layer between the first glass plate and the second glass plate;
a thermally conductive member extending adjacent to the fourth surface;
The first glass plate is made of tempered glass, crystallized glass, or wire-reinforced glass,
The first surface and the fourth surface have peripheral portions each having a flame-shielding area that can be covered by the flame-shielding member,
the heat conducting member has a thermal conductivity higher than a thermal conductivity of the second glass plate and is disposed in at least a part of the flame blocking region;
A double-glazing module, wherein a linear heat transmittance α (W/(m·K)) of a member provided across the first glass sheet and the second glass sheet in the flame-blocking region is within the range of the following formula:
[Number 1]
((1140/R)-755)/24805≦α<0.042
R: This is the fire resistance time of a second glass plate having a thickness of d (mm) in a fire resistance test performed by heating from the side of the first glass plate, expressed as a ratio when the fire resistance time of a second glass plate having a thickness of 3 mm is set to 1, and is calculated by the following formula.
[Number 2]
R=0.0044d ² -0.0108d+0.9923 The double-glazing module according to claim 1, wherein the flame-blocking area is 10 mm to 30 mm from the end face of the first glass sheet or the second glass sheet. The insulating glass module according to claim 1 or 2, wherein the thermal conductivity of the spacer is lower than the thermal conductivity of the second glass sheet. The insulating glass module according to any one of claims 1 to 3, wherein the heat-conducting member is disposed on at least a portion of the end surface of the second glass sheet. The insulating glass module according to any one of claims 1 to 4, wherein the heat-conducting member is disposed only in the flame-shielding area. The insulating glass module according to any one of claims 1 to 4, wherein the heat-conducting member extends to the outside of the flame-shielding area. The insulating glass module according to any one of claims 1 to 6, wherein the heat-conducting member is arranged so as not to come into contact with the first glass sheet. The insulating glass module according to any one of claims 1 to 6, wherein the heat-conducting member is arranged so as to be in contact with the first glass sheet. The insulating glass module according to any one of claims 1 to 8, wherein the second glass plate is made of non-tempered glass or non-heat-resistant glass. A double glazing module that faces a flame-blocking member and can be attached to the flame-blocking member,
A first glass plate having a first surface and a second surface provided on a back side of the first surface;
a second glass plate having a third surface opposite to the second surface and a fourth surface provided on a back side of the third surface;
a spacer disposed on a peripheral portion of the second surface and the third surface to form a gap layer between the first glass plate and the second glass plate,
The first glass plate is made of tempered glass, crystallized glass, or wire-reinforced glass,
The first surface and the fourth surface have peripheral portions each having a flame-shielding area that can be covered by the flame-shielding member,
A double-glazing module, wherein a linear heat transmittance α (W/(m·K)) of a member provided across the first glass sheet and the second glass sheet in the flame-blocking region is within the range of the following formula:
[Number 3]
((1200/R)-755)/24805≦α<0.042
R: This is the fire resistance time of a second glass plate having a thickness of d (mm) in a fire resistance test performed by heating from the side of the first glass plate, expressed as a ratio when the fire resistance time of a second glass plate having a thickness of 3 mm is set to 1, and is calculated by the following formula.
[Number 4]
R=0.0044d ² -0.0108d+0.9923 a heat conductive member extending from an end surface of the first glass plate to an end surface of the second glass plate;
The insulating glass module according to claim 10 , wherein the heat conducting member has a thermal conductivity higher than a thermal conductivity of the second glass sheet. The insulating glass module according to claim 10 or 11, wherein the flame-blocking region is located at a position from 10 mm to 30 mm from an end face of the first glass plate or the second glass plate. The insulating glass module according to any one of claims 1 to 12, wherein the third surface further comprises a heat conduction suppressing film that suppresses heat conduction in the plate surface direction of the second glass plate. The insulating glass module according to claim 13, wherein the heat conduction suppression film is a heat ray reflecting film. The insulating glass module according to claim 14, wherein the heat reflective film includes a metal layer. The insulating glass module according to claim 13, wherein the thermal conductivity of the heat conduction suppression film is lower than the thermal conductivity of the second glass plate. The insulating glass module according to any one of claims 1 to 16, wherein the corners of the end faces of the second glass sheet are not chamfered. The insulating glass module according to any one of claims 1 to 17, wherein the flame-blocking area is 10 mm to 30 mm from the end faces of the first glass sheet and the second glass sheet. The insulating glass module according to any one of claims 1 to 18, wherein the thickness of the second glass plate is 2 mm or more and 10 mm or less. An insulating glass module according to any one of claims 1 to 19;
a flame-shielding member that faces the first glass plate and the second glass plate and clamps the peripheral portions of the first glass plate and the second glass plate with a thermal insulating material interposed therebetween. A glass window in which the insulating glass module according to any one of claims 1 to 19 is clamped and fixed to the flame blocking member.

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