JP7490389B2 - Glass modules, glass units and glass windows - Google Patents

Description

The present invention relates to a glass module, a glass unit, and a glass window that include glass plates.

Patent Document 1 shows fireproof glass in which the peripheral portion of the glass plate is fixed in a state in which it is covered by a frame, which is an example of a flame-shielding member. The overlap (insertion amount) of the glass plate with respect to the flame-shielding member is specified in "Japan Architectural Standard Specifications for Construction Work and Commentary JASS17 Glass Work" (hereinafter referred to as JASS17). JASS17 exemplifies the overlap of the glass plate as the total surface clearance (the dimension of the gap between the plate surface of the glass plate and the flame-shielding member) at the peripheral portion of the glass plate. If the overlap of the glass plate is large, when the center of the glass plate receives the heat of combustion during a fire, the temperature difference between the center of the glass plate and the peripheral portion covered by the flame-shielding member becomes large, and the glass plate is prone to thermal cracking. For this reason, it is common to minimize the overlap of the glass plate.

JP 2013-209289 A

As shown in Patent Document 1, the glass plate is sandwiched between flame-blocking members on both the upper and lower sides. Here, if the glass plate is heated due to a fire and reaches its softening point, the glass plate may deform under its own weight and become detached from the flame-blocking members supporting the upper side. If this happens, the fire-protection function of the glass plate will be significantly impaired.

In light of the above situation, there is a demand for glass modules, glass units, and glass windows that prevent the glass plate from coming off the flame-blocking member even if the glass plate is deformed by the heat of combustion during a fire.

The characteristic configuration of the glass module according to the present invention is that it is a glass module that faces a flame-shielding member and can be assembled to the flame-shielding member, and includes a glass plate, and the glass plate includes an upper covering area that can be clamped and covered by the flame-shielding member on the upper side of the plate surface when the direction of gravity is the vertical direction, and a lower covering area that can be clamped and covered by the flame-shielding member on the lower side of the plate surface, and the vertical length of the upper covering area is configured to be longer than the vertical length of the lower covering area.

According to this configuration, the glass plate in the glass module is configured so that, when the direction of gravity is the vertical direction, the vertical length of the upper covered area is longer than the vertical length of the lower covered area. Therefore, even if the glass plate is deformed by being heated by the heat of combustion such as a fire, the upper covered area of the glass plate is less likely to come off the flame blocking member. As a result, the glass module can maintain the fire protection function of the glass plate in the event of a fire.

Another characteristic feature is that the glass plate is configured to be clamped between the flame-blocking member via an elastic support.

With this configuration, the glass plate can be supported with the elastic support member filling the gap between it and the flame blocking member.

Another characteristic feature is that the vertical length of the upper covering area is configured to be 1.5 times or more the sum of the dimensions of the gap between the glass plate and the flame blocking member in the direction perpendicular to the surface of the glass plate.

A glass module is generally assembled to a flame-shielding member by arranging various elastic supports in the gap between the glass plate and the flame-shielding member. In this case, when the glass plate is deformed by the heat of combustion during a fire, the elastic supports arranged between the glass plate and the flame-shielding member in the upper covering region of the glass plate may thermally decompose, and the support function of the glass plate in the upper covering region may be lost. If this happens, the glass plate may easily come off the flame-shielding member. Therefore, in this configuration, the vertical length of the upper covering region is configured to be 1.5 times or more the sum of the dimensions of the gap between the glass plate and the flame-shielding member in the direction perpendicular to the plate surface of the glass plate. As a result, even if the elastic supports in the upper covering region are thermally decomposed and a gap occurs between the flame-shielding member and the glass plate, the upper covering region of the glass plate will not easily come off the flame-shielding member.

Another characteristic feature is that the vertical length of the lower covering area is configured to be greater than the sum of the dimensions of the gap between the glass plate and the flame blocking member in the direction perpendicular to the surface of the glass plate.

When the glass plate is deformed by the heat of combustion during a fire, the elastic support arranged in the lower covering area of the glass plate may thermally decompose, and the support function of the glass plate in the lower covering area may be lost. In this case, the glass plate may tilt, and the upper covering area may become easily detached from the flame-shielding member. Therefore, in this configuration, the vertical length of the lower covering area is configured to be greater than the sum of the dimensions of the gap between the glass plate and the flame-shielding member in the direction perpendicular to the plate surface of the glass plate. As a result, even if the elastic support in the lower covering area thermally decomposes and a gap occurs between the flame-shielding member and the glass plate, the amount of tilt of the glass plate is suppressed, and the upper covering area of the glass plate is less likely to become detached from the flame-shielding member.

Another characteristic feature is that the vertical length of the upper covering region is configured to be 10 mm or more and 30 mm or less from the end face of the upper side of the glass plate.

JASS17 stipulates that the vertical length of the upper covering region must be 10 mm or more. On the other hand, if the vertical length of the upper covering region exceeds 30 mm, the flame-blocking member will prevent the upper covering region on the periphery of the glass plate from being heated, and the temperature difference between the center and periphery of the glass plate will increase, making the glass plate more susceptible to thermal cracking. Therefore, in this configuration, the vertical length of the upper covering region is configured to be 10 mm or more and 30 mm or less from the edge of the upper side of the glass plate.

Another characteristic feature is that the length of the lower covering area in the vertical direction is configured to be 10 mm or more and 30 mm or less from the end face of the lower side of the glass plate.

JASS17 stipulates that the vertical length of the lower covering area must be 10 mm or more. On the other hand, if the vertical length of the lower covering area exceeds 30 mm, the flame-shielding member will prevent the lower covering area on the periphery of the glass plate from being heated, and the temperature difference between the center and periphery of the glass plate will increase, making the glass plate more susceptible to thermal cracking. Therefore, in this configuration, the vertical length of the lower covering area is configured to be 10 mm or more and 30 mm or less from the edge of the lower side of the glass plate.

Another characteristic feature is that the thickness of the glass plate is 5 mm or more.

According to this configuration, by increasing the thickness of the glass plate, deformation due to heat is suppressed, so that the upper covering area of the glass plate is less likely to come off the flame-shielding member.

Another characteristic feature is that the glass plate has a first outer surface and a second outer surface provided on the rear side of the first outer surface, and is provided with a heat-conducting member arranged adjacent to at least one of the first outer surface and the second outer surface, the heat-conducting member having a higher thermal conductivity than the glass plate and configured to be arranged in at least a portion of the upper covering region.

In the event of a fire, the center of the glass plate is directly heated by the heat of combustion, but the upper covering region of the glass plate is prevented from heating by the flame-shielding member. Therefore, if the vertical length of the upper covering region is greater than the vertical length of the lower covering region, the temperature difference between the center of the glass plate and the periphery of the upper covering region becomes large, thermal stress occurs in the periphery that restrains the thermal expansion of the center, and the upper covering region of the glass plate is particularly susceptible to thermal cracking. Therefore, in this configuration, the glass module is provided with a heat-conducting member having a higher thermal conductivity than the glass plate, and the heat-conducting member is configured to be arranged on at least a part of the first outer surface and the second outer surface of the upper covering region. In this way, if a fire occurs in a compartment facing one of the glass plates, the combustion heat is transferred from the center of the glass plate to the upper covering region via the heat-conducting member. As a result, the temperature difference between the center of the glass plate and the upper covering region becomes smaller, making it difficult for thermal cracking to occur in the periphery of the glass plate.

Another characteristic feature is that the thermally conductive member comprises a metal foil and an adhesive layer, and the adhesive layer comprises an adhesive and thermally conductive fine particles.

According to this configuration, the thermally conductive member has an adhesive layer with a pressure-sensitive adhesive, so that the thermally conductive member can be easily fixed to the glass plate. In addition, the thermally conductive member has a metal foil and has thermally conductive fine particles in the adhesive layer, so that the thermally conductive member can reliably transfer heat from the center of the glass plate to the peripheral portion.

Another characteristic feature is that the thermally conductive microparticles have a higher thermal conductivity than the adhesive.

The adhesive layer of the thermally conductive member tends to have a lower thermal conductivity than metal foil because it contains an adhesive. However, as in this configuration, by making the thermal conductivity of the thermally conductive microparticles higher than that of the adhesive, the thermal conductivity of the adhesive layer can be easily increased.

Another characteristic feature is that the surface of the metal foil has projections and recesses.

The metal foil of the heat conducting member is located on the front surface of the glass plate and is covered by the flame-shielding member. Therefore, in the event of a fire, radiant heat from the flame-shielding member may be transmitted to the metal foil. In this case, if the surface of the metal foil is uneven as in this configuration, surface reflection in the metal foil is suppressed, making it easier for the metal foil to absorb radiant heat. As a result, the heat conducting member can efficiently receive heat from the flame-shielding member as well and heat the peripheral portion of the glass plate.

The glass unit according to the present invention is characterized in that it comprises a glass module having the above-mentioned configuration and a flame-blocking member that holds both sides of the peripheral portion of the glass plate.

According to this configuration, the glass unit can be composed of a glass module and a flame-shielding member that sandwiches the upper and lower covered areas of the glass plate. This makes it possible to prevent the upper covered area of the glass plate from coming off the flame-shielding member, even if, for example, a fire breaks out in a compartment facing one of the glass plates and the glass plate is deformed by the heat of the combustion.

Another characteristic feature is that the flame-blocking member is a fixed frame for the sash.

With this configuration, the flame-blocking member is a fixed frame of the sash, so in the event of a fire, the flame-blocking member will not be lost and the peripheral portion of the glass plate can be heated.

Another characteristic feature is that the thermal conductivity of the fixing frame is 20 W/mK or more and 250 W/mK or less.

In this configuration, if the thermal conductivity of the fixed frame is 20 W/mK or more, it is sufficiently greater than the thermal conductivity of the glass plate (approximately 1 W/mK), and heat is easily transferred from the fixed frame to the glass plate. This makes it possible to reduce the temperature difference between the center and the periphery of the glass plate. If the thermal conductivity of the fixed frame were to exceed 250 W/mK, the fixed frame would be expensive, so the thermal conductivity of the fixed frame in this configuration is set to 20 W/mK or more and 250 W/mK or less.

Another characteristic feature is that a second heat conductive member is interposed between the upper covering region of the glass plate and the flame shielding member, and the thermal conductivity of the second heat conductive member is 20 W/mK or more and 250 W/mK or less.

According to this configuration, since the second heat conducting member is interposed between the upper covering region of the glass plate and the flame shielding member, the heat of the flame shielding member can be easily transferred to the glass plate by the second heat conducting member. The second heat conducting member has a thermal conductivity that is sufficiently greater than the thermal conductivity of the glass plate (approximately 1 W/mK). Therefore, the temperature difference between the center and the periphery of the glass plate can be reduced more quickly.

Another characteristic feature is that the second heat conducting member is provided in surface contact with the flame blocking member and the upper covering region.

According to this configuration, the second heat conducting member is provided in surface contact with the flame shielding member and the upper covering region, so that heat can be efficiently exchanged between the flame shielding member and the upper covering region. This makes it possible to more effectively reduce the temperature difference between the center and the periphery of the glass plate.

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

With this configuration, the glass module is fixed so that both sides of the peripheral portion are clamped to the flame-blocking member, which prevents the glass plate from falling off the flame-blocking member in the event of a fire, thereby maintaining fire protection performance.

FIG. 2 is a cross-sectional 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. 11 is a partial cross-sectional view of a glass unit according to another embodiment. FIG. 11 is a partial cross-sectional view of a glass unit according to another embodiment.

[First embodiment]
A first embodiment of a glazing unit 100 according to the present invention will be described with reference to Fig. 1 and Fig. 2. The glazing unit 100 includes a glazing module 10 and a flame-shielding member 20. The glazing module 10 includes a glass plate 1 and a heat-conducting member 11, which will be described later.

As shown in FIG. 1, the glass plate 1 is a rectangular single-layer glass having four peripheral edges 8, and is fitted and fixed into a flame-shielding member 20 having a recess along the peripheral edge 8 of the single-layer glass.

The flame-shielding member 20 is composed of a frame 21. The glass plate 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 of a sash having a recess. The thermal conductivity of the frame 21 is 20 W/mK or more and 250 W/mK or less. The glass plate 1 is fixed in the recess of the frame 21 by sandwiching the peripheral portion 8 between the backup material 23 and the elastic support 24. As shown in FIG. 1, a setting block 22 having a function of protecting the end surface 4 of the glass plate 1 is installed on the bottom surface of the recess of the frame 21 into which the four sides of the glass plate 1 are fitted. The setting block 22 only needs to be installed at several points on the lower end of the glass plate 1 to a degree that the weight of the glass plate 1 can be sufficiently distributed and supported, and does not need to be installed over the entire area of the four sides of the glass plate 1. In addition, in order to fix the glass plate 1 to the frame 21, a backup material 23 is provided between the glass plate 1 and the frame 21. Furthermore, to improve the waterproofing between the glass plate 1 and the frame 21, an elastic support 24 is provided on the upper part of the backup material 23 as a sealant. In this way, the glass plate 1 is configured to be clamped to the frame 21 (flame blocking member 20) via the elastic support 24. This allows the glass plate 1 to be supported by the elastic support 24, filling the gap between the glass plate 1 and the frame 21 (flame blocking member 20).

When the direction of gravity is the up-down direction, the peripheral portion 8 of the glass plate 1 includes an upper covering region 8a that can be clamped and covered by the frame body 21 on the upper side of the outer plate surfaces 5 and 6, and a lower covering region 8b that can be clamped and covered by the frame body 21 on the lower side of the outer plate surfaces 5 and 6. As shown in FIG. 1, the end surface 4 of the glass plate 1 is polished into a smooth curved shape to reduce the risk of breakage during transportation or assembly. In addition, a mark may be provided on the glass plate 1 to distinguish the upper covering region 8a from the lower covering region 8b. For example, a marking using removable tape may be applied to the boundary between the upper covering region 8a of the glass plate 1 and the region that is not covered.

The glass plate 1 has a first outer surface 5 and a second outer surface 6 provided on the back side of the first outer surface 5, and is made of tempered glass with a compressive stress of 150 MPa or more. The thickness of the glass plate 1 is, for example, 5 mm or more, preferably 6 mm or more, and more preferably 8 mm or more. By increasing the thickness, the glass plate 1 becomes less likely to deform due to heating. The glass plate 1 has, on the outer surface 5, 6, a flame-shielding area 2 that can be covered with a frame body 21, and a non-flame-shielding area 3 that is visible from the outside and is not covered by the flame-shielding member 20. The glass plate 1 is configured in a rectangular shape, and the flame-shielding area 2 is provided on the peripheral portion 8 of each of the four sides. The upper covering area 8a and the lower covering area 8b are present in the flame-shielding area 2. Here, the flame-blocking region 2 refers to the surface of the first outer panel surface 5 or the second outer panel surface 6 of the glass plate 1 that is blocked from the flame by the frame body 21 when the first outer panel surface 5 or the second outer panel surface 6 of the glass plate 1 is exposed to flame from a direction perpendicular to the panel surface. In other words, the flame-blocking region 2 (upper covering region 8a and lower covering region 8b) is the region where the flame-blocking member 20 is orthogonally projected onto the glass plate 1.

In this embodiment, the vertical length L1 of the upper covering area 8a is configured to be greater than the vertical length L2 of the lower covering area 8b. The length L2 satisfies the overlap allowance (insertion length) defined in the "Japan Architectural Standard Specifications for Building Construction and Commentary JASS17 Glass Construction."

With this configuration, even if the glass plate 1 is heated due to a fire or the like and softens and deforms under its own weight, the upper covering area 8a of the glass plate 1 is less likely to come off the frame 21. As a result, the glass plate 1 continues to be held by the flame blocking member 20 while maintaining its fireproofing performance.

When the glass sheet 1 is deformed by the heat of combustion during a fire, the elastic support 24 arranged in the upper covering region 8a of the glass sheet 1 may be thermally decomposed, and the support function of the glass sheet 1 may be lost in the upper covering region 8a. In this case, the upper covering region 8a of the glass sheet 1 may easily come off the frame body 21. Therefore, in this embodiment, the vertical length L1 of the upper covering region 8a is configured to be larger than the sum of the dimensions of the gap between the glass sheet 1 and the frame body 21 in the direction perpendicular to the plate surface (outer plate surfaces 5, 6) of the glass sheet 1, and is preferably 1.5 times or more the sum of the dimensions of the gap, and more preferably 2 times or more the dimensions of the gap. In other words, in the frame body 21, when the width in the direction perpendicular to the plate surface (outer plate surfaces 5, 6) of the glass sheet 1 is W1 and the thickness of the glass sheet 1 is W2, the vertical length L1 of the upper covering region 8a is larger than the sum of the dimensions of the gap between the glass sheet 1 and the frame body 21 (corresponding to the distance (W1-W2)). In this way, the overlap of the upper covering region 8a of the glass plate 1 with the frame body 21 is set to be larger than the movable region in the width direction of the frame body 21. As a result, even if the elastic support 24 in the upper covering region 8a is thermally decomposed and a gap occurs between the frame body 21 and the glass plate 1, the upper covering region 8a of the glass plate 1 is less likely to come off the frame body 21.

When the glass plate 1 is deformed by the heat of combustion during a fire, the elastic support 24 arranged in the lower covering region 8b of the glass plate 1 may thermally decompose, and the support function of the glass plate 1 may be lost in the lower covering region 8b. In this case, the glass plate 1 may tilt, and the upper covering region 8a may easily come off the frame body 21. Therefore, in this embodiment, the vertical length L2 of the lower covering region 8b is configured to be larger than the sum of the dimensions of the gap between the glass plate 1 and the frame body 21 in the direction perpendicular to the plate surface (outer plate surfaces 5, 6) of the glass plate 1. In other words, the vertical length L2 of the lower covering region 8b is larger than the sum of the dimensions of the gap between the glass plate 1 and the frame body 21 (corresponding to the distance (W1-W2)). As a result, even if the elastic support 24 in the lower covering region 8b thermally decomposes and a gap occurs between the frame body 21 and the glass plate 1, the amount of tilt of the glass plate 1 is suppressed, and the upper covering region 8a of the glass plate 1 is less likely to come off the frame body 21.

The vertical length L1 of the upper covering region 8a is configured to be 10 mm to 30 mm from the end surface 4 on the upper side of the glass plate 1, and preferably 15 mm to 25 mm. In JASS17, the covering region (overhang) of the glass plate 1 is stipulated to be equal to or greater than the sum of the surface clearance of the glass plate 1 (the dimension of the gap between the plate surface of the glass plate 1 and the flame shielding member 20), and to be 10 mm or more. Here, the total surface clearance of the glass plate 1 corresponds to the distance (W1-W2) in FIG. 1. On the other hand, although there is no particular regulation regarding the upper limit of the covering region (overhang), if the vertical length L1 of the upper covering region 8a exceeds 30 mm, the temperature difference between the center portion 7 and the peripheral portion 8 becomes large, and thermal cracking is likely to occur in the peripheral portion 8 of the glass plate 1. Therefore, in this configuration, the vertical length L1 of the upper covering region 8a is configured to be 10 mm to 30 mm from the end surface 4 on the upper side of the glass plate 1.

The vertical length L2 of the lower covering region 8b is configured to be 10 mm to 30 mm from the end surface 4 on the lower side of the glass plate 1, and preferably 10 mm to 18 mm. JASS17 specifies that it should be equal to or greater than the total surface clearance of the glass plate 1, and should be 10 mm or more. On the other hand, although there is no particular regulation regarding the upper limit of the covering region (overhang), if the vertical length L2 of the lower covering region 8b exceeds 30 mm, the temperature difference between the center portion 7 and the peripheral portion 8 becomes large, and thermal cracking is likely to occur in the peripheral portion 8 of the glass plate 1. Therefore, in this configuration, the vertical length L2 of the lower covering region 8b is configured to be 10 mm to 30 mm from the end surface 4 on the lower side of the glass plate 1. The lower covering region 8b is an area in which the glass plate 1 is less likely to come off than the upper covering region 8a. For this reason, the vertical length L2 of the lower covering region 8b is preferably 18 mm or less.

In the event of a fire, the central portion 7 of the glass sheet 1 is directly heated by the heat of combustion, but the upper covering region 8a of the glass sheet 1 is prevented from being heated by the flame-shielding member 20. Therefore, if the vertical length L1 of the upper covering region 8a is greater than the vertical length L2 of the lower covering region 8b, the temperature difference between the central portion 7 of the glass sheet 1 and the peripheral portion 8 of the upper covering region 8a becomes large, and the upper covering region 8a of the glass sheet 1 is particularly susceptible to thermal cracking. Therefore, the glass module 10 further includes a heat-conducting member 11 arranged adjacent to at least one of the first outer plate surface 5 and the second outer plate surface 6 of the upper covering region 8a. In this embodiment, the heat-conducting member 11 is arranged on both the first outer plate surface 5 and the second outer plate surface 6, but the heat-conducting member 11 may be arranged only on one of the first outer plate surface 5 and the second outer plate surface 6. The heat-conducting member 11 has a higher thermal conductivity than the glass sheet 1 and is configured to be arranged in at least a part of the upper covering region 8a (flame-shielding region 2). That is, the heat conducting member 11 may be disposed over the entire upper covering region 8a (flame-shielding region 2) or over a portion of the upper covering region 8a (flame-shielding region 2). Also, as shown in FIG. 1, the heat conducting member 11 may be disposed adjacent to at least one of the first outer plate surface 5 and the second outer plate surface 6 of the lower covering region 8b (flame-shielding region 2).

In the example shown in FIG. 1, the heat conductive member 11 is formed in a sheet shape and is fixed in a state of surface contact with the outer plate surfaces 5 and 6 of the flame-shielding area 2. Here, the surface contact state means that the heat conductive member 11 faces the outer plate surfaces 5 and 6 of the flame-shielding area 2, and as long as the majority of the heat conductive member 11 (e.g., 80% or more of the area) is in contact with the outer plate surfaces 5 and 6 of the flame-shielding area 2, a part of the heat conductive member 11 may be in a non-contact state. The thermal conductivity of the glass plate 1 made of soda glass is generally less than 1 W/mK. The thermal conductivity of the heat conductive member 11 is 50 W/mK or more, preferably 100 W/mK or more. For example, metals such as Sn, Al, Ag, Cu, and Zn can be used as the heat conductive member 11. By the way, the thermal conductivity of Sn is 64 W/mK, the thermal conductivity of Al is 204 W/mK, the thermal conductivity of Ag is 418 W/mK, the thermal conductivity of Cu is 372 W/mK, and the thermal conductivity of Zn is 113 W/mK.

In this way, by disposing the heat conductive member 11 on at least a part of the outer plate surfaces 5, 6 of the flame-shielding area 2, heat is conducted from the non-flame-shielding area 3 to the flame-shielding area 2 in the glass plate 1. As a result, if a fire breaks out in a compartment facing one of the glass plates 1, for example, the heat of combustion is conducted to the non-flame-shielding area 3 of the glass plate 1 exposed to the compartment, and from the non-flame-shielding area 3 to the flame-shielding area 2 of the glass plate 1 via the heat conductive member 11. As a result, the temperature of the flame-shielding area 2 rises and the temperature difference between the non-flame-shielding area 3 and the flame-shielding area 2 becomes smaller, making it difficult for the glass plate 1 to thermally crack.

In this embodiment, the heat conductive member 11 is provided from the outer plate surfaces 5, 6 (flame-shielding area 2) of the peripheral portion 8 of the glass plate 1 to the end surface 4. The heat conductive member 11 is arranged on at least a part of the end surface 4 of the glass plate 1. That is, the heat conductive member 11 may be arranged on the entire end surface 4 of the glass plate 1, or on a part of the end surface 4. As the heat conductive member 11, for example, metals or alloys such as Sn, Al, Ag, Cu, and Zn can be used. As a result, the combustion heat of the center portion 7 of the glass plate 1, which is directly exposed to the flame in the event of a fire, is efficiently transmitted to the end surface 4 of the peripheral portion 8 by the heat conductive member 11. As a result, the temperature of the end surface 4 of the glass plate 1 is easily increased, so that the temperature difference between the center portion 7 and the peripheral portion 8 of the glass plate 1 can be further reduced. Therefore, it is possible to reliably prevent thermal cracking in the peripheral portion 8 of the glass plate 1, which is far from the center portion 7 and where the temperature rise is slow.

The heat conducting member 11 is disposed only in the flame-shielding region 2 of the flame-shielding region 2 and non-flame-shielding region 3 of the glass plate 1. In other words, since the heat conducting member 11 does not extend into the non-flame-shielding region 3, the heat conducting member 11 is disposed on the glass plate 1 in a state in which it is not visible from the outside. This makes it possible to prevent thermal cracking of the glass plate 1 without the heat conducting member 11 affecting the appearance of the glass plate 1.

In this embodiment, the heat conducting member 11 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 glass plate 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 11. As a result, the temperature of the peripheral portion 8 of the glass plate 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 glass plate 1 and improving the fire resistance of the glass plate 1.

2, the thermally conductive member 11 is, for example, a tape body having excellent thermal conductivity, and includes a metal foil 12 and an adhesive layer 13. The adhesive layer 13 includes an adhesive 14 and thermally conductive fine particles 15. When the thermally conductive member 11 is a tape body, it is easy to adhere to the glass plate 1, so that smooth thermal conduction can be expected. Also, as shown in FIG. 1, if the glass plate 1 is prepared in a state in which the thermally conductive member 11 is attached to the outer plate surfaces 5, 6 and the end surface 4 of the peripheral portion 8 of the glass plate 1, it is preferable because the thermally conductive member 11 is easy to attach and the thermally conductive member 11 protects the end surface 4. The thermally conductive member 11 may be provided only in the part of the glass plate 1 where thermal cracking is likely to occur, but in order to ensure fire resistance, it is preferable to provide it around the entire circumference of the glass plate 1 (the peripheral portion 8 of the four sides).

In this embodiment, the heat conducting member 11 is configured not to come into contact with the frame 21 of the flame shielding member 20. Since the heat conducting member 11 does not come into contact with the frame 21, the heat conducting member 11 does not require dimensional accuracy in the direction perpendicular to the plate surface of the glass plate 1. Therefore, taking into account the specifications of the glass plate 1 and the thermal conductivity of the heat conducting member 11, the thickness, etc. of the heat conducting member 11 can be easily adjusted within a dimensional range that is equal to or smaller than the gap between the glass plate 1 and the frame 21.

The heat conductive member 11 preferably has a higher absorptivity for near-infrared rays (wavelength 0.7 μm to 2.5 μm) than the glass plate 1, and in particular, the absorptivity for near-infrared rays with a wavelength of 2.5 μm is preferably higher than the glass plate 1. This absorptivity is preferably 0.1 or more with 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 glass plate 1 transmits near-infrared rays, the temperature rise of the peripheral portion 8 of the glass plate 1 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 11 is made higher than that of the glass plate 1. In addition, the thermal conductivity of the frame body 21 in this embodiment is set to 20 W/mK or more. As a result, the peripheral portion 8 of the glass plate 1 can easily receive radiant heat from the frame 21 through the heat conductive member 11, so that the temperature difference between the center portion 7 and the peripheral portion 8 of the glass plate 1 can be reduced more quickly by raising the temperature of the peripheral portion 8 of the glass plate 1. In addition, the emissivity of the heat conductive member 11 is preferably 0.1 or more with 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 21 being reflected by the heat conductive member 11, so that the radiant heat can be efficiently transferred to the flame-shielding area 2 via the heat conductive member 11.

The heat conducting member 11 may be configured with fine irregularities on the surface of the metal foil 12. If the surface of the metal foil 12 has fine irregularities, surface reflection in the metal foil 12 is suppressed, and the metal foil 12 is more likely to absorb radiant heat. As a result, the heat conducting member 11 can efficiently receive radiant heat from the flame shielding member 20 as well, and heat the peripheral portion 8 of the glass plate 1.

The metal foil 12 provided in the heat conducting member 11 has a thermal conductivity of 50 W/mK or more, preferably 100 W/mK or more. If the thermal conductivity of the metal foil 12 is 50 W/mK or more, the thermal conductivity of the heat conducting member 11 can also be increased to 50 W/mK or more. This allows heat from the center 7 of the glass plate 1 to be quickly transferred to the peripheral portion 8 of the glass plate 1 via the heat conducting member 11, allowing the peripheral portion 8 to be heated quickly. In order to increase the thermal conductivity of the heat conducting member 11, it is more preferable that the thermal conductivity of the metal foil 12 is 100 W/mK or more.

The metal foil 12 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/mK, the thermal conductivity of Al is 204 W/mK, the thermal conductivity of Ag is 418 W/mK, the thermal conductivity of Cu is 372 W/mK, and the thermal conductivity of Zn is 113 W/mK. In other words, Sn, Al, Ag, Cu, and Zn all have a thermal conductivity of 50 W/mK or more. Therefore, by the metal foil 12 containing at least one of the above-mentioned metals at 50% by weight or more, the thermal conductivity of the heat conductive member 11 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 14 is either acrylic, silicone, or natural rubber based. This makes it easy to form the adhesive layer 13 in the thermally conductive member 11.

The thermally conductive microparticles 15 have a higher thermal conductivity than the adhesive 14. This allows the thermally conductive member 11 to increase the thermal conductivity of the adhesive layer 13 by using the thermally conductive microparticles 15.

The adhesive layer 13 contains 50% to 90% by weight of thermally conductive microparticles 15, preferably 60% to 80% by weight. This allows the thermally conductive member 11 to ensure both thermal conductivity and adhesiveness in the adhesive layer 13. If the thermally conductive microparticles 15 are less than 50% by weight in the adhesive layer 13, the adhesive layer 13 cannot obtain sufficient thermal conductivity. If the thermally conductive microparticles 15 are more than 90% by weight in the adhesive layer 13, the proportion of the adhesive 14 becomes too low, reducing the adhesive strength and making the thermally conductive member 11 more likely to peel off from the glass plate 1.

The adhesive layer 13 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 13 has a thickness of 10 μm or more and 100 μm or less, the thermal conductive member 11 can ensure both thermal conductivity and adhesiveness in the adhesive layer 13. In the thermal conductive member 11, if the thickness of the adhesive layer 13 is less than 10 μm, peeling may occur due to the difference in thermal expansion between the metal foil 12 and the glass plate 1 in the event of a fire. On the other hand, if the thickness of the adhesive layer 13 exceeds 100 μm, the thermal conductivity of the thermal conductive member 11 including the adhesive layer 13 may be reduced due to the large influence of the adhesive 14. Since the adhesive layer 13 includes the adhesive 14 having a lower thermal conductivity than the metal foil 12, it is preferable that the thickness of the adhesive layer 13 is smaller than the thickness of the metal foil 12. For example, if the thickness of the metal foil 12 is 100 μm, the thickness of the adhesive layer 13 can be set to 30 to 50 μm. In this way, the adhesive layer 13 can be set to a thickness approximately half that of the metal foil 12.

The thermally conductive particles 15 contained in the adhesive layer 13 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 15 is 10 μm or more and 100 μm or less, the thermally conductive member 11 can reliably ensure thermal conductivity in the adhesive layer 13. When the particle diameter of the thermally conductive particles 15 is less than 10 μm, the thermally conductive particles 15 are unevenly arranged in the adhesive layer 13, so that uniform thermal conductivity may not be ensured. On the other hand, when the particle diameter of the thermally conductive particles 15 exceeds 100 μm, the surface area of the thermally conductive particles 15 becomes small, so that the thermal conductivity of the thermally conductive member 11 may be reduced. The particle diameter of the thermally conductive particles 15 is preferably equal to or less than the thickness of the adhesive layer 13. As shown in FIG. 2, in this embodiment, the thermally conductive member 11 is configured so that the particle diameter of the thermally conductive particles 15 and the thickness of the adhesive layer 13 are the same.

The thermally conductive microparticles 15 are metal microparticles. When the thermally conductive microparticles 15 are metal microparticles, thermal conductivity can be reliably imparted to the adhesive layer 13. 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 13 can be easily increased.

As metal microparticles, of 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 14 is exposed to the heat of combustion during a fire and its adhesiveness is reduced, the adhesion between the glass plate 1 and the adhesive layer 13 can be ensured by melting the surface of the metal microparticles. In addition, the metal microparticles contained in the adhesive layer 13 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 glass plate 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 glass plate 1. The backup material 23 and the elastic support 24 are made of resin or rubber with high thermal insulation properties, and the heat transfer from the center 7 of the glass plate 1, which has become hot due to a fire, to the backup material 23 and the elastic support 24 via the heat conductive member 11 is suppressed. As a result, the heat transferred to the peripheral portion 8 of the glass plate 1 via the heat conductive member 11 increases, so the temperature of the peripheral portion 8 can be efficiently raised, and fire resistance can be improved more reliably. In addition, in order to suppress the escape of heat from the heat conductive member 11 to the setting block 22 and efficiently raise the temperature of the peripheral portion 8 of the glass plate 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. 3. The same members as those in the first embodiment are designated by the same reference numbers, and the description thereof will be omitted here.

In this embodiment, the second heat conductive member 30 is interposed between the upper covering region 8a of the glass plate 1 and the frame body 21. The second heat conductive member 30 is disposed between the frame body 21 and the heat conductive member 11 fixed to the upper covering region 8a. The second heat conductive member 30 is made of a metal having a thermal conductivity of 20 W/mK or more and 250 W/mK or less. If the second heat conductive member 30 is a metal, a material having a higher thermal conductivity than the glass plate 1 can be easily selected. The second heat conductive member 30 has a first contact portion 31 and a second contact portion 32. The first contact portion 31 is a portion that is in surface contact with the heat conductive member 11 fixed to the peripheral portion 8 of the glass plate 1. The second contact portion 32 is bent toward the bottom side of the frame body 21 more than the backup material 23, and is a portion that is in surface contact with the inner surface 25 of the frame body 21. With this configuration, heat can be easily transferred from the frame 21, which has become hot due to a fire, to the peripheral portion 8 of the glass plate 1 through the second heat conductive member 30, which has a thermal conductivity sufficiently higher than that of the glass plate 1 (approximately 1 W/mK). In addition, since the thermal conductivity of the frame 21 is 20 W/mK or more, it is sufficiently higher than the thermal conductivity of the glass plate 1 (approximately 1 W/mK), and heat is easily transferred from the frame 21, which has become hot due to a fire, to the peripheral portion 8 of the glass plate 1 through the second heat conductive member 30. As a result, the peripheral portion 8 of the glass plate 1 is easily heated, and the temperature difference between the center portion 7 and the peripheral portion 8 of the glass plate 1 can be quickly reduced. As a result, thermal cracking of the glass plate 1 can be prevented, and the fire resistance of the glass plate 1 can be improved. The second heat conductive member 30 may be provided in the lower covering region 8b, or may be provided over the peripheral portions 8 of the four sides of the glass plate 1.

[Third embodiment]
A third embodiment of the glass unit 100 will be described with reference to Fig. 4. The same members as those in the first embodiment are denoted by the same reference numbers, and the description thereof will be omitted here.

The heat conductive member 11 may be configured to be arranged on at least one of the first outer plate surface 5 and the second outer plate surface 6 in the non-flame-shielding region 3. In this embodiment, the heat conductive member 11 is arranged adjacent to both the outer plate surfaces 5 and 6 of the non-flame-shielding region 3 adjacent to the flame-shielding region 2 in addition to the flame-shielding region 2 of the glass plate 1. Although not shown, the heat conductive member 11 may be arranged on only one of the first outer plate surface 5 and the second outer plate surface 6 in the non-flame-shielding region 3. In this configuration, due to the presence of the heat conductive member 11 fixed to the non-flame-shielding region 3, the combustion heat received by the non-flame-shielding region 3 of the glass plate 1 is easily transferred to the flame-shielding region 2 via the heat conductive member 11. This makes it possible to quickly reduce the temperature difference between the non-flame-shielding region 3 and the flame-shielding region 2 of the glass plate 1. In addition, the heat conductive member 11 is provided on the outer plate surfaces 5 and 6 of the non-flame shielding region 3 that are adjacent to the flame shielding region 2, so it is possible to reduce the range of the heat conductive member 11 in the non-flame shielding region 3 and minimize the effect of the heat conductive member 11 on the appearance of the glass plate 1.

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

In this embodiment, the heat conductive member 11 is provided only on the outer plate surfaces 5, 6 (flame-blocking region 2) of the glass plate 1, and not on the end surface 4. Even with this configuration, the heat conductive member 11 arranged in the flame-blocking region 2 can transfer heat from the center portion 7 of the glass plate 1, which has become extremely hot due to the heat of combustion of a fire, to the peripheral portion 8 including the end surface 4, via the heat conductive member 11. This makes it possible to reduce the temperature difference between the center portion 7 and the peripheral portion 8 of the glass plate 1, thereby improving fire resistance.

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

In this embodiment, the heat conductive member 11 is provided from the outer plate surfaces 5 and 6 of the glass plate 1 to the frame body 21. In this manner, the heat conductive member 11 may be configured to be able to contact the frame body 21, at least a portion of which is the flame-shielding member 20. The heat conductive member 11 has a first contact portion 16 and a second contact portion 17. The first contact portion 16 is a portion that is in surface contact with the outer plate surfaces 5 and 6 of the glass plate 1. The second contact portion 17 is a portion that is in surface contact with the inner surface 25 of the frame body 21 while being sandwiched between the frame body 21 and the backup material 23. In addition, since the thermal conductivity of the frame body 21 is 20 W/mK or more, it is sufficiently larger than the thermal conductivity of the glass plate 1 (about 1 W/mK), and heat is easily transferred from the frame body 21 to the peripheral portion 8 of the glass plate 1 via the second contact portion 17. With this configuration, two heat transfer paths to the peripheral portion 8 of the glass plate 1 can be secured, one from the center portion 7 of the glass plate 1 and the other from the frame 21, which further promotes heating of the peripheral portion 8 of the glass plate 1.

[Other embodiments]
(1) In the above embodiment, in the glass module 10, the heat conductive member 11 may be disposed around the entire periphery 8 of the glass plate 1, or the heat conductive member 11 may be disposed at intervals in the circumferential direction of the peripheral portion 8 of the glass plate 1. The heat conductive member 11 may be disposed, for example, only on the upper and lower sides of the four sides of the glass plate 1. Even if the heat conductive member 11 is disposed on the four sides of the peripheral portion 8 of the glass plate 1, the heat conductive member 11 may not be disposed at the corners where two sides intersect. In the above embodiment, the heat conductive member 11 is disposed over the entire flame-shielding region 2 corresponding to the height direction of the frame 21, but the heat conductive member 11 may be disposed, for example, only in a part of the flame-shielding region 2 adjacent to the end face 4.

(2) In the above embodiment, the flame-shielding area 2 may be provided in a shape that crosses the central part of the glass plate 1 in addition to the peripheral part 8 of the glass plate 1, and is set appropriately according to the shape of the frame body 21 of the glass plate 1. Furthermore, the flame-shielding area 2 may be configured by at least a part of the outer plate surfaces 5, 6 of the glass plate 1 that are covered by the flame-shielding member 20. In other words, the frame body 21 may be shaped so as not to cover the end surface 4 of the glass plate 1.

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

(4) 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. 7, the flame-blocking member 20 may be composed of only a frame body 21.

(5) In the above embodiment, an example in which the glass plate 1 is made of single-layer glass has been shown, but as shown in FIG. 8, the glass plate 1 may be made of double-layer glass. In the example of FIG. 8, the glass plate 1 is made of a first glass plate 41, a second glass plate 42, and a spacer 43 arranged between the first glass plate 41 and the second glass plate 42. The first glass plate 41 is tempered glass, and the second glass plate 42 is Low-E glass. A low-reflection film 44a is coated on the surface 44 of the second glass plate 42 facing the first glass plate 41. The heat conductive member 11 is fixed in contact with at least the outer plate surface 45 and the end surface 47 of the first glass plate 41 and the outer plate surface 46 and the end surface 48 of the second glass plate 42. The heat conductive member 11 may be fixed in contact with the inner surface of the first glass plate 41 and the inner surface of the second glass plate 42.

In any of the embodiments, the configuration of the heat conducting member 11 or the second heat conducting member 30 is not limited to that shown in Figures 1 to 8. In other words, other configurations can be adopted as long as the heat conducting member 11 or the second heat conducting member 30 is in contact with and fixed to the outer plate surface (at least one of 5, 6, 45, and 46) of the glass plate 1 when the glass unit 100 is completed.

The present invention can be applied to glass modules and glass units that include glass plates. It can also be applied to double glazing as well as single glazing.

1: Glass plate 2: Flame-shielding region 3: Non-flame-shielding region 4: End faces 5, 6: Outer plate surface 7: Central portion 8: Peripheral portion 8a: Upper covering region 8b: Lower covering region 10: Glass module 11: Thermally conductive member 12: Metal foil 13: Adhesive layer 14: Adhesive 15: Thermally conductive fine particles 20: Flame-shielding member 21: Frame 22: Setting block 23: Backup material 24: Elastic support 30: Second thermally conductive member 41: First glass plate 42: Second glass plate 100: Glass unit L1, L2: Vertical length W1: Width of recess of frame W2: Thickness of glass plate

Claims (16)

A glass module that faces a flame-shielding member and can be assembled to the flame-shielding member,
A glass plate is provided.
When the gravity direction is the up-down direction, the glass plate includes an upper covering region on the upper side of the plate surface that can be clamped and covered by the flame-shielding member, and a lower covering region on the lower side of the plate surface that can be clamped and covered by the flame-shielding member,
a length in the vertical direction of the upper covering region is configured to be longer than a length in the vertical direction of the lower covering region,
The glass plate has a first outer plate surface and a second outer plate surface provided on a back side of the first outer plate surface,
A heat conductive member is provided adjacent to at least one of the first outer plate surface and the second outer plate surface,
The heat conductive member includes a metal foil and an adhesive layer, has a thermal conductivity higher than that of the glass plate, and is configured to be disposed on at least a portion of the upper covering region ;
The adhesive layer comprises an adhesive and thermally conductive particles . The glass module according to claim 1 , wherein the thermally conductive particles have a thermal conductivity greater than that of the adhesive. 3. The glass module according to claim 1, wherein the surface of the metal foil has projections and recesses. The glass module according to claim 1 , wherein the glass plate is configured to be held by the flame-shielding member via an elastic support body. 5. A glass module as claimed in claim 1, wherein the vertical length of the upper covering region is configured to be 1.5 times or more the sum of the dimensions of the gap between the glass plate and the flame-shielding member in a direction perpendicular to the plate surface of the glass plate. A glass module as described in any one of claims 1 to 5, wherein the vertical length of the lower covering region is configured to be greater than the sum of the dimensions of the gap between the glass plate and the flame-shielding member in a direction perpendicular to the plate surface of the glass plate. The glass module according to claim 1 , wherein the length in the vertical direction of the upper covering region is configured to be 10 mm or more and 30 mm or less from the end face on the upper side of the glass plate. The glass module according to claim 1 , wherein the vertical length of the lower covering region is configured to be 10 mm or more and 30 mm or less from the end face on the lower side of the glass plate. 9. The glass module according to claim 1, wherein the glass plate has a thickness of 5 mm or more. A glass module according to any one of claims 1 to 9 ;
a flame-shielding member that holds a peripheral portion of the glass plate. The glass unit according to claim 10 , wherein the flame blocking member is a fixed frame of a sash. The glass unit according to claim 11 , wherein the fixing frame has a thermal conductivity of 20 W/mK or more and 250 W/mK or less. A glass module that faces a flame-shielding member and can be assembled to the flame-shielding member,
Equipped with a glass plate,
When the gravity direction is the up-down direction, the glass plate includes an upper covering region on the upper side of the plate surface that can be clamped and covered by the flame-shielding member, and a lower covering region on the lower side of the plate surface that can be clamped and covered by the flame-shielding member,
a length in the vertical direction of the upper covering region is configured to be longer than a length in the vertical direction of the lower covering region,
The glass plate has a first outer plate surface and a second outer plate surface provided on a back side of the first outer plate surface,
A heat conductive member is provided adjacent to at least one of the first outer plate surface and the second outer plate surface,
the thermally conductive member includes a metal foil and an adhesive layer, has a thermal conductivity higher than that of the glass plate, and is configured to be disposed on at least a portion of the upper cover region; and
a flame-shielding member that holds the peripheral portion of the glass plate,
A second heat conductive member is interposed between the upper covering region of the glass plate and the flame shielding member,
A glass unit, wherein the thermal conductivity of the second thermal conductive member is 20 W/mK or more and 250 W/mK or less. A second heat conductive member is interposed between the upper covering region of the glass plate and the flame shielding member,
13. The glass unit according to claim 10 , wherein the second thermal conduction member has a thermal conductivity of not less than 20 W/mK and not more than 250 W/mK. The glass unit according to claim 13 or 14 , wherein the second heat conducting member is provided in surface contact with the flame blocking member and the heat conducting member arranged in the upper covering region. A glass window, comprising: a glass module according to any one of claims 1 to 9 ; and the glass module is clamped and fixed to the flame blocking member.

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