JP2001335346A - Glass panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage originated from a part where a through-hole is formed. SOLUTION: In a glass panel, spacers 2 for holding spacing are interposed between a pair of plate glasses of which the faces are opposed to each other, an outer peripheral part between the plate glasses is sealed, and a space part V is formed between the plate glasses. Through-holes 4 communicating with the space part are formed in one glass plate 1A of the pair of plate glasses, and the space part is sucked through the through-holes to keep the space in a decompressed state. Plate thickness T1 of one plate glass of the pair of glasses is made thicker than plate thickness T2 of another plate glass 1B of the pair of glasses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space between a pair of glass sheets having a plate surface facing each other, a spacer for maintaining a space between the glass sheets, and an outer peripheral portion between the glass sheets being sealed. Forming a gap, forming a through hole communicating with the gap in one of the pair of glass sheets, sucking the gap through the through hole, and keeping the gap in a reduced pressure state Related to the glass panel.

[0002]

2. Description of the Related Art The above-mentioned glass panel is one in which a gap formed between glass sheets is maintained in a reduced pressure state to enhance heat insulation performance. Suction is performed through the through-holes formed in the sheet glass, and the gap is kept in a reduced pressure state.The gap between the sheet glass is set so that a large bending moment does not act on the sheet glass due to the pressure difference between the pressure of the gap and the atmospheric pressure. The plate glass is supported by spacers for maintaining the spacing interposed therebetween, thereby reducing bending stress generated in the plate glass.

[0003]

However, the bending stress generated in the glass sheet tends to concentrate on the location where the through-hole where the cross-sectional shape of the glass sheet changes rapidly, and the glass panel is easily damaged from the location where the through-hole is formed. There is. The present invention has been made in view of the above circumstances, and has as its object to prevent breakage from a portion where a through hole is formed.

[0004]

The feature of the invention according to claim 1 is that, as exemplified in FIGS. 1 and 5, between a pair of plate glasses 1 (1A, 1B) whose plate surfaces face each other. A spacer 2 for maintaining an interval is interposed, and an outer peripheral portion between the glass sheets 1 is sealed to form a gap V between the glass sheets 1, and one of the glass sheets 1A of the pair of glass sheets 1 A glass panel in which a through-hole 4 communicating with the gap V is formed, the gap V is sucked through the through-hole 4, and the gap V is held in a reduced pressure state, The point is that the plate thickness T1 of 1A is larger than the plate thickness T2 of the other plate glass 1B. [Operation] Since the plate thickness T1 of one glass plate 1A in which the through hole 4 communicating with the gap V is formed is larger than the plate thickness T2 of the other glass plate 1B, bending of the glass plate 1A is performed. By increasing the rigidity as compared with the related art, it is possible to reduce the bending stress generated in the plate glass 1A in which the through holes 4 are formed, as compared with the related art. Further, instead of increasing the thickness of the pair of glass sheets 1 together, the thickness T1 of the one glass sheet 1A forming the through hole 4 is made larger than the thickness T2 of the other glass sheet 1B. The thickness T1 of one of the glass sheets 1A is increased in a state where the thickness T2 of the other glass sheet 1B is reduced by the thickness of 1A, that is,
The bending stress generated in one of the glass sheets 1A that is easily damaged from the formation of the through hole is made smaller than in the past, and the bending stress that is generated in the other glass sheet 1B that is less likely to be damaged than that of the glass sheet 1A is increased. In a state where the magnitude of the bending stress is distributed in a well-balanced manner in accordance with the easiness of breakage of the glass sheet 1, the bending stress generated in the glass sheet 1A in which the through holes 4 are formed can be made smaller than before. [Effect] Since the bending stress generated in the plate glass having the through hole formed therein can be made smaller than in the past, even if the bending stress is concentrated on the portion where the through hole is formed, the glass panel is formed from the portion where the through hole is formed. Can be prevented from being damaged. Further, in a state in which the thickness of one glass sheet is reduced by the thickness of the other glass sheet, it is possible to prevent the glass panel from being damaged from the location where the through hole is formed, without increasing the thickness of the entire glass panel. In the case of a glass panel in which one of the thick glass plates is attached to the outside of a building or the like, the thickness of the flat glass plate that is exposed to the wind and rain or undergoes a drastic temperature change is less likely to have such a risk. Therefore, the glass panel is less likely to be damaged, and the durability can be enhanced.

[0005] The characteristic structure of the invention described in claim 2 is shown in FIG.
As illustrated in FIG. 6, a glass tube 5 is attached to the through hole 4, and the glass tube 5 and the through hole 4 are bonded to each other.
The point is that the end portion 5a of the glass tube 5 is melted to seal the through hole 4 in a state where the gap V is sucked through the glass tube 5 and decompressed. [Operation] The tip of the suction cup A2 forming the suction port A1 of the suction device A is brought into close contact with the plate surface of one sheet glass 1A so as to cover the through hole 4 with the suction cup A2. When the gap V is sucked through the bonded glass tube 5 and depressurized, the sheet glass 1A is kept in a state where the gap V is depressurized.
Since the inclination angle (bending) of the glass tube 5 is small and the change in the attitude of the glass tube 5 is small, the glass tube 5 is heated by the glass tube melting heating source A5 provided inside the suction cup A2 while the gap V is decompressed. When the distal end portion 5a is melted and sealed, it is easy to hold the heating source A5 and the distal end portion 5a of the glass tube 5 at predetermined relative positions. [Effect] The tip of the glass tube is easily heated to a predetermined temperature with high accuracy, and the tip of the glass tube is melted so that a pinhole or the like is not formed, and the through hole is easily sealed. Note that, for convenience of comparison with the drawings, the description is given with reference numerals, but the present invention is not limited to the configuration of the attached drawings by the entry.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows one embodiment of a glass panel of the present invention. A glass panel P has a plurality of gaps between a pair of glass sheets 1 whose sheet surfaces are opposed to each other at intervals along the sheet surface. The holding spacer 2 is interposed, and the outer peripheral portion between the plate glasses 1 is sealed over the entire circumference with a sealing portion 3 made of a low melting point glass such as a solder glass having a low gas permeability. 10 ^-2 Torr (about 1.33P
a) A gap portion V maintained in the following reduced pressure state is formed between the glass sheets 1.

[0007] The pair of glass sheets 1 are both made of transparent float glass, and the thickness T1 of the outer glass sheet 1A attached to the outside of the building, which is one of the glass sheets, is: The outer glass sheet 1 is made thicker than the thickness T2 of the inner glass sheet 1B attached to the inside of the building, which is the other glass sheet.
A having a plate thickness T1 of 3.1 mm is used as A, and an inner plate glass 1B having a plate thickness T2 of 2.8 mm is used.
The bending stiffness of the outer glass sheet 1A is increased as compared with the related art.

The spacer 2 has a compressive strength of 5 × 10 ³ k.
Using a material of gf / cm ² (about 4.9 × 10 ⁴ N / cm ² ) or more, for example, stainless steel (SUS304), the diameter is about 0.3 mm to 1.0 mm, and the height is about 0.1 mm. 15mm
A columnar shape of about 1.0 mm is preferable, and an interval between the spacers 2 is preferably about 20 mm.

The outer peripheral edges of the two glass sheets 1 are arranged in such a manner that the outer peripheral edge of the inner glass sheet 1B protrudes over the entire periphery along the sheet surface direction from the outer peripheral edge of the outer glass sheet 1A. When forming 3, the sealing work of the gap V is efficiently performed by placing a sealing material such as a paste-like solder glass on the protruding portion with the inner plate glass 1B facing down. And it is configured to be able to perform it reliably.

A method for maintaining the gap V of the glass panel intermediate product P1 in which the outer peripheral portion between the plate glasses 1 is sealed by the sealing portion 3 with the spacer 2 interposed therebetween in a reduced pressure state will be described. Outer plate glass 1A of the glass panel intermediate product P1
Has a diameter of 3 m communicating with the gap V, as shown in FIG.
A stepped through hole 4 consisting of a large-diameter hole 4a having a diameter of about m and a small-diameter hole 4b having a diameter of about 2 mm is formed in advance, and a glass tube 5 is mounted in the large-diameter hole 4a so as to be perpendicular to the plate surface. And
The peripheral surface of the through hole 4 and the glass tube 5 are hermetically bonded and fixed with low melting point glass 6.

FIGS. 3 and 4 show a glass panel intermediate product P1.
Is drawn through the glass tube 5 to depressurize the gap V, and then heat-melts and seals the tip 5a of the glass tube 5 to form a suction-sealing device A, which has a suction port A1. A flexible pipe A3 that sucks and discharges the gas in the gap V is connected to the lateral side of the cylindrical suction cup A2,
The distal end of the suction cup A2 is provided with an elastic O-ring A4 for sealing the space between the suction cup A2 and the surface of the outer glass sheet 1A.
An electric heater A5 as a heating source for heating and melting the distal end portion 5a of the glass tube 5 is provided inside the bottom of the glass tube 5.

Then, as shown in FIG. 5, the glass panel intermediate product P1 is horizontally supported in the heating furnace B so that the outer glass sheet 1A is on the upper side. The suction cup A2 is placed so as to cover the glass tube 5 adhered and fixed, and the tip of the suction cup A2 is brought into close contact with the plate surface of the outer glass sheet 1A via the O-ring A4,
While the whole glass panel intermediate product P1 is heated to, for example, about 200 ° C. to activate the inside of the gap V, the gas in the gap V is sucked and discharged through the flexible pipe A3 to reduce the gap V to 1.0 × The pressure is reduced to 10 ^-2 Torr (about 1.33 Pa) or less.

In the depressurizing operation of the gap V, since the bending rigidity of the sheet glass 1A in which the through hole 4 is formed is larger than that of the related art, the tip of the suction cup A2 is brought into close contact with the plate surface of the sheet glass 1A to form the gap. During suction of V, even if the sheet glass 1A bends due to the pressure difference between the pressure in the gap V and the atmospheric pressure, the inclination angle (bending) of the sheet glass 1A becomes smaller than before,
As a result, the change in the unevenness of the plate surface becomes small,
Even if the degree of decompression is large, it is possible to prevent a decrease in the degree of adhesion between the tip of the suction cup A2 and the plate surface of the plate glass 1A without strongly pressing the suction cup A2 against the plate glass 1A, as compared with the related art. It is easy to greatly reduce the pressure in the gap portion in a state in which the glass panel P is not easily broken, and a glass panel P having high heat insulation performance can be manufactured.

In other words, as the degree of pressure reduction in the gap V increases, the inclination angle (bending) of the plate glass portion between the spacers 2 and between the spacer 2 and the outer peripheral portion of the plate glass 1A increases, and the unevenness of the plate surface increases. Since the change becomes large, the gap V formed between the glass sheets having the same thickness as in the related art is obtained.
When suction is performed by the suction cup A2 to reduce the pressure, the degree of adhesion between the tip of the suction cup A2 and the plate surface of the glass sheet 1A is reduced, and it is difficult to greatly reduce the pressure in the gap V, and it is difficult to enhance the heat insulation performance. .

In order to solve this drawback, the tip of the suction cup A2 is pressed against the sheet glass 1A more strongly than before to improve the adhesion, or the sheet glass 1A is made thicker to increase its bending rigidity. However, when the tip of the suction cup A2 is strongly pressed against the glass sheet 1A, in addition to the pressure difference between the pressure in the gap V and the atmospheric pressure, the pressing force of the suction cup A2 that is stronger than before is increased.
Therefore, there is a disadvantage that the glass sheet 1A is easily damaged. When the thickness of the glass sheet 1A is increased, the conventional glass panel P forms a gap V between the glass sheets 1 having the same thickness. However, there is a drawback that the thickness of the entire glass panel P becomes thick, and that the construction conditions such as attachment to the sash need to be changed.

In contrast to the above, the glass panel P of the present invention
Is a state in which the suction cup A2 is not strongly pressed against the glass sheet 1A and the thickness of the glass sheet 1A is reduced by the thickness of the glass sheet 1A. Less uneven changes in the
Since it is possible to suppress a decrease in the degree of adhesion between the suction cup A2 and the glass sheet 1A, the gap V is greatly reduced in pressure without increasing the thickness of the entire glass panel in a state where the glass sheet 1A is not easily damaged, and the heat insulation is achieved. The glass panel P with high performance can be manufactured.

Next, the glass tube 5 is heated by the electric heater A5.
Is melted by locally heating (approximately 1000 ° C.) the distal end portion 5a, thereby sealing the through hole 4 as shown in FIG.
After cooling in this state, the protective cap 7 covering the molten glass tube 5 is adhered to the outer glass sheet 1A to manufacture the glass panel P as shown in FIG.

The glass tube 5 has a thickness of 0.1 to 0.1 mm.
It is preferable to use one having a thickness of 1.0 mm. In other words, if a thickness exceeding 1.0 mm is used, it takes time from the temperature rise to the self-fusion when the tip 5a is closed, and the temperature rises to unnecessary parts in the surroundings. There is a risk that cracks may occur in the glass sheet 1 or the sealing portion 3 due to the resulting temperature gradient. Also,
When the thickness is less than 0.1 mm, the temperature can be easily raised, but it is difficult to maintain the shape by self-melting and the strength is weak, so that the material is extremely easily broken. Incidentally, in this embodiment, the outer diameter of the glass tube 7 is 1 to 1
0 mm and the height are set to 6 mm or less.

[Another Embodiment] <1> In the glass panel of the present invention, the thickness of the inner flat glass attached to the inside of a building or the like is made larger than the thickness of the outer flat glass attached to the outside of a building or the like. The thickness may be increased so that a through-hole communicating with the gap is formed in the inner glass sheet, the gap is sucked through the through-hole, and the gap is maintained in a reduced pressure state. <2> In the glass panel of the present invention, the entire glass panel intermediate product in which the outer peripheral portion between the glass sheets is sealed with a sealing portion with a spacer interposed is placed in a vacuum chamber, and the gap portion is evacuated. What is held may be used. <3> The glass panel of the present invention may be attached to a partition wall that partitions a building. <4> The glass panel of the present invention extends the periphery of one plate glass having a greater plate thickness than the other plate glass over the entire periphery.
You may make it protrude along the sheet surface direction from the periphery of the other sheet glass. <5> The glass panel of the present invention is not limited to one in which a glass tube adhered to a through-hole is melted to seal the through-hole. For example, molten glass having a low melting point is allowed to flow into the through-hole. Then, it may be sealed with the low melting point glass. <6> The glass panel of the present invention can be used for a wide variety of applications, for example, for construction and vehicles (automobile window glass, railway vehicle window glass, ship window glass).
・ For device elements (surface glass of plasma display,
It can be used for the doors and walls of refrigerators and the doors and walls of heat retaining devices. <7> The plate glass used for the glass panel of the present invention is:
The type is not limited to the float glass described in the above embodiment, and the type thereof can be arbitrarily selected. For example, template glass, ground glass (glass having a function of diffusing light by surface treatment), and mesh Glass or tempered glass, plate glass having functions such as heat ray absorption, ultraviolet ray absorption, heat ray reflection, and low radiation, or a combination thereof may be used. The composition of the glass may be soda silicate glass (soda lime silica glass), borosilicate glass, aluminosilicate glass, or various crystallized glasses. <8> The plate glass used for the glass panel of the present invention is:
One glass sheet and the other glass sheet are not limited to those having different lengths and widths, but may be ones formed to have the same dimensions. The two glass sheets may be overlapped so that the edges are aligned. <9> The spacer material used for the glass panel of the present invention is not limited to stainless steel. For example, the spacer may be formed of various materials such as Inconel 718, other metal materials, quartz glass, and ceramic. Also, the shape thereof is not limited to a columnar shape, but may be a prismatic shape, and the spacing between the spacers can be appropriately changed. <10> In the glass panel of the present invention, the outer peripheral portion between the glass sheets may be sealed with a metal solder as a sealing material.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a glass panel.

FIG. 2 is an explanatory view of a method for manufacturing a glass panel.

FIG. 3 is a perspective view of a suction sealing device mounted on a glass panel.

FIG. 4 is an explanatory view of a method for manufacturing a glass panel.

FIG. 5 is an illustration of a method for manufacturing a glass panel.

FIG. 6 is an explanatory view of a method for manufacturing a glass panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet glass 1A One sheet glass 1B The other sheet glass 2 Spacer 4 Through-hole 5 Glass tube V Void T1 Sheet glass thickness of one sheet glass T2 Sheet thickness of the other sheet glass

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masao Misono 3-5-11 Doshomachi, Chuo-ku, Osaka-shi, Osaka F-term in Nippon Sheet Glass Co., Ltd. 2E016 AA05 BA07 CA01 CB01 CC02 EA01 4G061 AA20 BA01 BA02 CB02 CB12 CB14 CD02 CD14 CD22 CD23 CD24 CD25 DA24

Claims (2)

[Claims] 1. A spacer for maintaining a space between a pair of glass sheets whose sheet surfaces are opposed to each other,
Sealing the outer peripheral portion between the plate glasses, forming a gap between the plate glasses, forming a through hole communicating with the gap portion on one of the pair of plate glasses, and passing through the through hole. A glass panel in which the gap is sucked and the gap is held in a reduced pressure state, wherein the thickness of the one glass sheet is greater than the thickness of the other glass sheet. 2. A glass tube is attached to the through-hole, the glass tube and the through-hole are adhered to each other, and the gap is sucked through the glass tube to reduce the pressure of the glass tube. 2. The glass panel according to claim 1, wherein the through hole is sealed by melting a tip portion.