JP2001064043A - Production of low-pressure double layer glass and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for producing low-pressure double layer glass capable of rapidly producing a large amount of the low-pressure double layer glass. SOLUTION: The low-pressure double layer glass 1 is formed with a low- pressure space by isolating two sheets of sheet glass apart a prescribed spacing, disposing dotty, wire-shaped or net-like spacers for holding the spacing therebetween and melting and hermetically sealing the peripheral marginal edges of this panel. In the method for maintaining a low pressure in the hollow layer of the double layer glass 1 at the time of the production described above, >=2 units of vacuum pumps 41 and >=2 units of buffer tanks 7 and 8 connected with these vacuum pumps 41 are used and the discharge pipes emerging from the buffer tanks are connected to the aperture of the double layer glass, by which the low pressure is generated in the hollow layer of the double layer glass.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the field of energy saving in the field of construction such as housing and non-residential, the field of transportation of automobiles, vehicles, ships, aircrafts, etc., and the field of equipment such as freezers, freezer showcases, constant temperature and humidity chambers. The present invention relates to an apparatus for producing a low-pressure double-glazed glass having high heat insulating performance applied to an opening that requires the following.

[0002]

2. Description of the Related Art In recent years, in order to create a comfortable and healthy living environment with excellent energy saving, double glazing having heat insulation performance has been used more frequently than ever before and has been rapidly spreading.

As this double-glazed glass panel, Japanese Patent Application No. 55-40450 (JP-A-56-13) discloses a double-glazed glass panel in which a space formed by opposed glass sheets is reduced in pressure.
9384), Japanese Patent Application No. 61-506251 (Japanese Patent Publication No.
No. 84707) and Japanese Patent Application No. 2-511568 (Japanese Patent Publication No. 05-501896).

[0004]

In order to provide a heat insulating property by reducing the internal space of the double glazing, a pressure of 10 Pa
Below, it is necessary to reduce the pressure to preferably 1 Pa or less.
The double glazing whose internal space is depressurized in this way is called a low pressure double glazing. In order to reduce the internal pressure to the desired internal pressure, it is necessary to provide a sufficient area of the opening in the double-layer glass cell, but if the area of the opening is increased, sealing becomes difficult, and a strength problem occurs. The opening area is not enough,
There is a problem that it takes too much time for decompression.

[0005]

SUMMARY OF THE INVENTION According to the present invention, two sheets of glass are spaced at a predetermined interval, and a dot-like, linear or mesh-like spacer for maintaining this interval is provided. In a method of producing a low-pressure double-glazed glass having a low-pressure space formed by melting and sealing a portion thereof, a low pressure is applied to the hollow layer of the double-glazed glass. In this method, two or more vacuum pumps and two or more vacuum pumps connected to the vacuum pump are connected. Using more than one buffer tank,
A method for producing a low-pressure double glazing, characterized in that an exhaust pipe coming out of the buffer tank is connected to an opening of the double glazing to lower the pressure in a hollow layer of the double glazing.

[0006] Further, there is provided the method for producing a low-pressure double-glazed glass, wherein vacuum pumps having different ultimate vacuum degrees or low-pressure arrival speeds are used.

[0007] Further, a vacuum gauge and an open / close valve are provided between the buffer tank and the double-glazed glass, and the open / close valve is closed in response to an abnormal value of the vacuum gauge. It is a manufacturing method of.

[0008] Further, there is provided an apparatus used in the method for producing a low-pressure double-glazed glass, wherein a pipe connecting the buffer tank and the vacuum pump is connected by a pipe provided with an opening / closing valve.

In the piping from the buffer tank to the double glazing, an opening / closing valve is provided in each piping of the buffer tank, the tip of which is connected to the single glazing, and connected to the double glazing. This is an apparatus used in the method for producing the low-pressure double glazing.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is for producing a low-pressure double glazing in which two glass sheets are separated at a predetermined interval. Two sheets of glass are clear float glass, heat-absorbing glass, heat-reflecting glass, high-performance heat-reflecting glass, line-in glass, net-in glass, template glass, tempered glass, double-strength glass, low-reflection glass, Various functional plate glasses such as high transmittance plate glass, ground glass, tapesti (frost) glass, ceramics printed glass, laminated glass can be appropriately combined, and at least one sheet is preferably a low radiation plate glass obtained by laminating a special metal on these various plate glasses. . Further, it is more preferable that the low radiation plate glass has no film laminated only in a portion having a width of 10 to 15 mm from the edge portion.

In particular, an antireflection metal oxide layer selected from one or more oxides of zinc, tin, titanium, indium, bismuth and zirconium having a thickness of 10 to 60 nm, a silver layer having a thickness of 5 to 30 nm, An antioxidant layer containing at least one metal selected from the group consisting of aluminum, titanium, zinc, tantalum and a nickel chromium alloy having a thickness of 0.3 to 30 nm; zinc, tin, titanium, indium and bismuth having a thickness of 30 to 100 nm; A layer in which one or more anti-reflective metal oxide layers selected from oxides of zirconium are sequentially laminated, or a layer having a thickness of 10 to 60 nm
Anti-reflective metal oxide layer selected from one or more of oxides of zinc, tin, titanium, indium, bismuth, and zirconium, aluminum, titanium, zinc, tantalum and nickel-chromium alloy having a thickness of 0.3 to 30 nm Antioxidant layer containing one or more metals selected from
A 30 nm silver layer, an antioxidant layer containing at least one metal selected from the group consisting of aluminum, titanium, zinc, tantalum and a nickel chromium alloy having a thickness of 0.3 to 30 nm; zinc and tin having a thickness of 30 to 100 nm; Titanium, indium,
When a film layer composed of an anti-reflection metal oxide layer selected from one or more of bismuth and zirconium oxide layers is used in order, the glass has sufficient heat resistance at the preheating temperature of the glass when the glass is heated and melted. It is more preferable because the heat insulation performance can be remarkably improved.

It is preferable that the two glass sheets have the same size. As a material for a dot-like, linear or mesh-like spacer for maintaining a distance between two sheet glasses, as long as the material has a lower hardness than glass and has an appropriate compressive strength, it is not particularly limited, but a metal, an alloy, or the like can be used. , Steel or ceramics are preferred. For metals, iron, copper, aluminum,
Alloys such as tungsten, nickel, chromium, titanium, etc.
For steel, carbon steel, chrome steel, nickel steel, stainless steel, nickel chrome steel, manganese steel, chromium manganese steel, chromium molybdenum steel, silicon steel, brass, nichrome, duralumin, and the like are used.

The point spacers are arranged in a grid, for example, in a spherical, cylindrical or prismatic shape.

The linear spacer has a circular, semicircular, or square cross section, and may be linear or curved. The mesh spacer may be a square or rhombus.

In the case where a metal or alloy is coated with ceramics, the design can be improved by coloring, and the reflection characteristic of the metal can be suppressed.

The spacing between the dot-like, linear or mesh-like spacers is 100 mm or less, preferably 75 mm or less.

The arrangement of these spacers may be regular or irregular as long as it is within the range of the arrangement interval.

The interval between the two sheets of glass is 0.05 mm or more and 2.0 mm or less, and 0.1 mm or more and 1.0 mm or more.
The following is preferred.

A circular hole having a diameter of about 10 mm is made in advance in one of the two pieces of the combined glass,
The peripheral edge is melt-sealed, and the hole is provided with a glass tube for exhaust. Alternatively, an opening may be formed without forming a hole in the glass and melting and sealing a part of the peripheral end.

It is preferable that the glass tube for exhaust and the exhaust tube coming out of the buffer tank are connected by using a flexible tube to exhaust air. Glass pipes for exhausting two or more double-glazed glasses may be connected to the exhaust pipe.

There are two or more buffer tanks, and one or more vacuum pumps are connected to each buffer tank. The buffer tank pressure is adjusted according to the production volume, from a relatively high pressure reduced pressure to a pressure reduced to a pressure lower than the pressure of the hollow layer of the product. When there are two buffer tanks, one buffer tank is placed in a relatively high pressure reduced pressure state,
The other buffer tank is evacuated to a pressure lower than the pressure of the hollow layer of the product.

The pressure state of such a buffer tank is as follows.
It may be realized individually by a vacuum pump connected to the buffer tank.However, it is recommended that the pipes connecting the buffer tank and the vacuum pump be connected by a pipe with an open / close valve, and that the appropriate vacuum pump is used. However, it is preferable to make the state of the buffer tank low in pressure.

The vacuum pump is a rotary pump, a booster pump, a cryopump, or the like. A cryopump is used as a buffer tank in which all the buffer tanks are depressurized by the rotary pump or the booster pump, and then further reduced to a lower pressure state. It is preferable to reduce the pressure.

The piping for exhausting between the buffer tank and the double glazing is obtained by taking out a pipe with an open / close valve from each buffer tank, unifying the pipe and connecting the pipe to the exhaust glass pipe of the double glazing. An open / close valve and a vacuum gauge are provided on the unified pipe. The on-off valve is desirably provided as close as possible to the double-glazed glass. The vacuum gauge is provided on the buffer tank side of the opening / closing valve.

In a preferred embodiment, the piping for exhaust between the buffer tank and the double glazing should be increased as much as possible so that the pressure of the buffer tank does not greatly change at the time of decompression, because the productivity is improved. is there.

The vacuum gauge detects the pressure in the sealed hollow layer of the double glazing. Based on the value of the pressure detected by the vacuum gauge, the on-off valve of the pipe coming out of the buffer tank is opened and closed. That is, in the initial stage of decompression of the sealed hollow layer of the double-glazed glass, only the open / close valves of the pipes coming out of the buffer tank with the highest pressure are opened, and the open / close valves of the pipes coming out of the other buffer tanks are opened. Is closed and decompression is started. When the pressure in the sealed hollow layer drops and becomes about the same as the set pressure of the buffer tank connected to reduce the pressure, close the open / close valve of the connected buffer tank and the second largest pressure Open only the open / close valve of the pipe coming out of the buffer tank. In this way, only the open / close valves of the pipes coming out of the buffer tank with a lower pressure are opened, and finally,
The sealed hollow layer is depressurized with a buffer tank set to a desired pressure as a low-pressure double-glazed glass, and when the sealed hollow layer reaches a desired pressure, an opening for exhausting the double-glazed glass Is sealed to produce a low-pressure double glazing.

Here, the predetermined pressure of the low pressure double glazing is, for example, 10 Pa or less, preferably 1 Pa or less.

The vacuum gauge is used for controlling the opening / closing of the opening / closing valve coming out of the buffer tank as described above.
If the double-glazed glass breaks during the depressurization, a pressure increase is detected by a vacuum gauge, and all the open / close valves on the damaged double-glazed glass side are closed to prevent a pressure increase in the buffer tank. Furthermore, if the sealing state of the double-glazed glass is poor, it will take time to depressurize or it will not be depressurized, and the product inspection shall be performed at the same time by the time differentiation of the pressure drop of the sealed hollow layer. Can be done.

It is to be noted that the piping between the buffer tank and the double glazing should be provided independently with a large number of single piping systems. In this case, since the pressure can be reduced, there is no need to stop the apparatus, which is a desirable embodiment.

Although the opening and closing valve may be manually operated, it is preferable that the opening and closing valve can be automatically controlled using an electromagnetic valve or a hydraulic valve.

The vacuum gauge is preferably a set of a U-shaped manometer, a McLeod vacuum gauge, a Pirani vacuum gauge, an ionization vacuum gauge, etc., which can measure both a high pressure state and a low pressure state.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

Example 1 FIG. 1 is a schematic system diagram of an apparatus for producing a low-pressure double-glazed glass according to Example 1. The buffer tank 7 is connected to a vacuum pump 40 via a pipe 50 provided with an opening / closing valve 30, and the buffer tank 8 is connected to a vacuum pump 41 via a pipe 51 provided with an opening / closing valve 31. Furthermore, piping 5
0 and the pipe 51 are connected by a pipe 53 provided with an opening / closing valve 33.

Electromagnetic valves were used for all of the open / close valves 30, 31, and 33. As the vacuum pump 40, a rotary pump and a booster pump can be used in combination, and a cryopump is used as the vacuum pump 41.

The pipe 55 between the buffer tanks 7 and 8 and the double glazing is composed of one pipe provided with the open / close valve 20 extending from the buffer tank 7 and one pipe provided with the open / close valve 23 extending from the buffer tank 8. An open / close valve 10 and a vacuum gauge 4 are provided in a unified pipe section.

In the pipe 55, the on-off valves 10, 2
0 and 23 all used an electromagnetic valve, and the vacuum gauge 4 used both a Pirani gauge and an ionization gauge.

Using the apparatus shown in FIG. 1, low pressure double glazing was produced in the following order. The opening and closing valves 10 and 31 were closed, and the opening and closing valves 20, 23, 30 and 33 were opened, and the pressure in the buffer tanks 7 and 8 was reduced to 30 Pa by the rotary pump of the vacuum pump 40. Then, the pressure in the buffer tanks 7 and 8 was reduced to 15 Pa using the booster pump of the vacuum pump 40. Next, the opening / closing valves 20, 23, 30, 33
Is closed, the opening / closing valve 31 is opened, the cryopump is operated, and after the pressure of the buffer tank 8 reaches 0.1 Pa, the opening / closing valve 31 is closed, and a flexible pipe is connected to the pipe 55 through the pipe 55. And ligated. After connecting the openings of the double glazing, the opening and closing valves 10 and 20 are opened to reduce the pressure. When the Pirani vacuum gauge of the vacuum gauge 4 indicates 15 Pa, the opening and closing valve 20 is closed and the opening and closing valve 23 is opened. The pressure was switched to the reduced pressure by the buffer tank 8. After the pressure reduction by the buffer tank 8 is started, the ionization vacuum gauge of the vacuum gauge 4 indicates 0.1 Pa, and then the open / close valves 10, 20, 2 are opened.
3 was closed, the opening of the double glazing was sealed, the double glazing was replaced, and production of the low pressure double glazing continued.

The opening and closing of the open / close valve other than the opening of the open / close valve 10 was automatically controlled based on a value read by a vacuum gauge.

When the low-pressure double glazing was manufactured by the manufacturing apparatus of the present embodiment, the time required for depressurizing the hollow layer was greatly reduced. Furthermore, it was confirmed from the value obtained by differentiating the read value of the vacuum gauge with time that a double-glazed glass with a poor sealing state can be detected.

Example 2 FIG. 2 is a schematic system diagram of an apparatus for producing a low-pressure double-glazed glass according to Example 2. This is an example in which a pipe 56 between the buffer tanks 7 and 8 and the multi-layer glass is added to the apparatus of the first embodiment. Piping 56
Open / close valves 11, 21 and 24 operate in the same manner as the open / close valves 10, 20 and 23 of the pipe 55, respectively.

Up to the point where the double glazing 1 is connected to the pipe 55, the same procedure as in the first embodiment is performed. When the pressure of the double glazing 1 is switched to the buffer tank 8, the double glazing 2 is connected to the pipe 56. Decompression of the double glazing 2 was started. After the pressure in the buffer tank 8 is reduced, the opening / closing valve 10 is automatically closed when the hollow layer of the multilayer glass 1 reaches 0.1 Pa, and after closing the opening, the multilayer glass is replaced. The double glazing 2 is similarly replaced with the next double glazing.

In the control of the opening / closing valve, the buffer tank was designed not to simultaneously reduce the pressure of the two double glazings.

In this embodiment, it is possible to realize a state in which the buffer tanks 7 and 8 are always depressurizing the double-layer glass, and it is possible to manufacture with a production efficiency about 1.5 times that of the first embodiment.

Example 3 FIG. 3 is a schematic system diagram of an apparatus for producing a low-pressure double-glazed glass according to Example 3. This embodiment is an example in which three buffer tanks are used. Buffer tanks 7, 8 and vacuum pump 40,
Reference numeral 42 is the same as in the first and second embodiments.

The vacuum pump 42 connected to the buffer tank 9 uses a rotary pump, a booster pump, and a cryopump to reduce the pressure of the hollow layer of the multi-layer glass by 15 P.
a and 0.1 Pa.

The manufacturing apparatus according to the present embodiment adjusts the waiting time for the switching of the buffer tank occurring in the second embodiment.

With the manufacturing apparatus of this embodiment, the production efficiency of the low-pressure double glazing could be made about three times that of the first embodiment.

[0048]

The apparatus for producing a low-pressure double-glazed glass according to the present invention comprises:
A large amount of low pressure double glazing can be manufactured in a short time.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram of an apparatus for producing a low-pressure double-glazed glass using two buffer tanks according to the present invention.

FIG. 2 is a schematic system diagram of an apparatus for producing a low-pressure double-glazed glass according to a second embodiment of the present invention.

FIG. 3 is a schematic system diagram of an apparatus for producing a low-pressure double-glazed glass according to a third embodiment of the present invention.

[Explanation of symbols]

 1,2,3 Double glazing 4,5,6 Vacuum gauge 7,8,9 Buffer tank 10,11,12 Open / close valve 40,41,42 Vacuum pump

Continued on the front page (72) Inventor Nobuyuki Itakura 1510 Oguchicho, Matsusaka-shi, Mie Central Glass Co., Ltd. Glass Research Laboratory F-term (reference) 4G061 AA13 AA18 BA01 BA02 BA07 BA10 CB02 CD02 CD13 CD14 CD23 CD25 DA30 DA61

Claims (5)

[Claims] 1. Two glass sheets are spaced at a predetermined interval, and a dot-like, linear or mesh-like spacer for maintaining this interval is provided, and the peripheral edge of the panel is melt-sealed to reduce the pressure. In a method of producing a low-pressure double-glazed glass having a space formed therein, a method of lowering the pressure of the hollow layer of the double-glazed glass using two or more vacuum pumps and two or more buffer tanks connected to the vacuum pump. A method for producing a low-pressure double glazing, wherein an exhaust pipe protruding from the buffer tank is connected to an opening of the double glazing to lower the pressure of the hollow layer of the double glazing. 2. The method for producing a low pressure double glazing according to claim 1, wherein vacuum pumps having different ultimate vacuum degrees or low pressure arrival speeds are used. 3. A vacuum gauge and an opening / closing valve are provided between the buffer tank and the double glazing, and the opening / closing valve is closed in response to an abnormal value of the vacuum gauge.
The method for producing a low-pressure double-glazed glass according to claim 2. 4. The apparatus used in the method for producing a low-pressure double-glazed glass according to claim 1, wherein a pipe connecting the buffer tank and the vacuum pump is connected by a pipe provided with an opening / closing valve. . 5. The piping from the buffer tank to the double glazing is characterized in that a buffer valve is provided with an opening / closing valve in each of the pipes, and the tip of the opening is connected to the double glazing. An apparatus used in the method for producing a low-pressure double-glazed glass according to claim 1.