JP6489440B2 - Glass article manufacturing equipment - Google Patents

Description

  The present invention relates to a manufacturing apparatus for glass articles such as tubular glass.

  For example, an apparatus for manufacturing a glass article such as tubular glass includes a molded body for molding molten glass, a molding chamber in which the molded body is disposed, a combustion chamber for heating the molding chamber via a partition, and the combustion chamber. And a burner for heating.

  Conventionally, silicon carbide refractories known to have excellent fire resistance, heat resistance, thermal shock resistance and high thermal conductivity have been widely used for the partition walls.

  However, the silicon carbide refractory reacts with residual oxygen in the exhaust gas of the burner at a high temperature to produce a silicate compound. This silicate compound is fragile and expands with respect to the original silicon carbide refractory. Therefore, a part of the partition wall may be peeled off, collapsed, or deformed, resulting in a gap in the partition wall. In this case, the exhaust gas enters the molding chamber through this gap, and the molding conditions of the molten glass are not stabilized.

  For such a problem, for example, Patent Document 1 proposes to use an electric heater as a heating means instead of a burner.

JP 2009-234873 A

  However, in order to use an electric heater in a glass article manufacturing apparatus, equipment such as a transformer is required, which may increase the manufacturing cost. From such a viewpoint, a burner is used as a heating means. Is preferably used.

  When using a burner as a heating means, it is conceivable to use a refractory having oxidation resistance for the partition as a method for solving the above-mentioned problem. However, in this case, there is a possibility that the partition wall cannot obtain the high thermal conductivity that the silicon carbide refractory has. Conventionally, a silicon carbide refractory as a partition has a function of a soaking plate that suppresses uneven temperature in the molding chamber and uniformly heats the molten glass flowing on the molded body due to its high thermal conductivity. It was. Therefore, if a refractory material having oxidation resistance is simply used for the partition wall, the partition wall may not be obtained due to the action of the soaking plate (soaking action), which may adversely affect the molding of the molten glass. is there.

  In view of the above circumstances, an object of the present invention is to provide a soaking action as well as oxidation resistance to partition walls in a glass article manufacturing apparatus using a burner as a heating means.

  An apparatus for manufacturing a glass article according to the present invention, which was created to solve the above problems, comprises a molded body for molding molten glass, a molding chamber in which the molded body is disposed, and heating the molding chamber through a partition wall. In a manufacturing apparatus for manufacturing a glass article including a combustion chamber that performs heating and a burner that heats the combustion chamber, the partition includes an oxidation-resistant portion made of an oxide-based refractory, and the molding in the oxidation-resistant portion. And a soaking part made of a non-oxide refractory having a thermal conductivity higher than that of the oxidation-resistant part, which is disposed in at least a partial region on the chamber side. Here, the oxide-based refractory is a refractory containing an oxide as a main material (hereinafter the same). Further, the non-oxide refractory is a refractory containing a non-oxide as a main raw material (hereinafter the same). In addition, a main raw material is a raw material with the mass% contained most in a raw material.

  In this configuration, the partition wall is composed of an oxidation resistant portion and a soaking portion. The oxidation resistant portion is made of an oxide refractory that is difficult to oxidize, and therefore has oxidation resistance. The soaking part is made of a non-oxide refractory having a higher thermal conductivity than that of the oxidation resistant part, and thus has a soaking action. The non-oxide refractory in the soaking part is inferior in oxidation resistance, but the soaking part is disposed on the molding chamber side in the oxidation resistant part and is not in contact with the residual oxygen in the exhaust gas, so it is oxidized. Hateful. As described above, the partition wall is composed of the oxidation resistant part and the soaking part, thereby having oxidation resistance and soaking action. That is, according to the glass article manufacturing apparatus of the present invention, the partition wall can be provided with a soaking action as well as oxidation resistance.

  Said structure WHEREIN: It is preferable that the said non-oxide type refractory is a silicon carbide refractory.

  Since the silicon carbide refractory has a higher thermal conductivity, a soaking action can be more reliably imparted to the partition wall.

  Said structure WHEREIN: It is preferable that the said oxide refractory is an alumina zircon refractory.

  Since the alumina zircon refractory has a relatively high thermal conductivity among oxide-based refractories, it can further impart a soaking action to the partition walls. Moreover, since the alumina zircon refractory has high heat resistance, the heat resistance of the partition walls can be improved.

  Said structure WHEREIN: It is preferable that the said molded object is a sleeve rotationally driven around the inclined axis line.

  If it is this structure, it will become a manufacturing apparatus of the so-called Danner type tubular glass, and can manufacture tubular glass and rod-shaped glass.

  In the above configuration, the molding chamber has a high temperature region provided on the inclined upper side and a low temperature region provided on the inclined lower side along the axis of the sleeve, and at least in the high temperature region, the soaking part Is preferably disposed.

  A higher temperature in the molding chamber is more likely to cause temperature unevenness, so that the soaking action of the soaking part becomes more effective.

  Said structure WHEREIN: It is preferable that the said soaking | uniform-heating part is arrange | positioned only at the bottom side of the said molding chamber.

  When placed on the bottom side of the molding chamber, it is possible to place it just by placing it without using an adhesive. Even when using an adhesive, soaking until the adhesive is dry. There is no need to support the part, and the arrangement is easy.

  As described above, according to the present invention, in a glass article manufacturing apparatus using a burner as a heating means, it is possible to impart a soaking action together with oxidation resistance to a partition wall.

It is a schematic side sectional view showing an apparatus for manufacturing a glass article according to an embodiment of the present invention. It is an AA arrow schematic sectional drawing of FIG. It is a schematic sectional side view which shows the modification of the manufacturing apparatus of a glass article. It is a figure equivalent to the AA arrow schematic sectional drawing of FIG. 1 which shows the modification of the manufacturing apparatus of a glass article.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side cross-sectional view showing a glass article manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. This glass article manufacturing apparatus 1 is a so-called Danner apparatus, and manufactures a tubular glass Gt.

  The manufacturing apparatus 1 heats the molded body 2 for molding the molten glass Gm, the molding chamber 3 in which the molded body 2 is disposed, the combustion chamber 5 for heating the molding chamber 3 via the partition walls 4, and the combustion chamber 5. And a burner 6. The manufacturing apparatus 1 also includes a feeder 7 that supplies molten glass Gm to the molded body 2 and an outer wall 8 that partitions the molding chamber 3 and the combustion chamber 5 from the external space of the manufacturing apparatus 1.

  The molded body 2 is a sleeve that is rotationally driven around an axis that is inclined with respect to a horizontal plane. The partition wall 4 includes a main body portion 4a and a ceiling portion 4b provided thereabove. A plurality of burners 6 are attached to the outer wall 8. A plurality of temperature sensors 9 such as thermocouples are installed in the molding chamber 3 in order to detect the temperature in the molding chamber 3. The outer wall 8 is provided with a discharge port 8a for discharging the exhaust gas from the burner 6. A support wall portion 8 b that supports the main body portion 4 a of the partition wall 4 is provided on the inner surface of the outer wall 8.

  The molding chamber 3 includes a high temperature region provided on the inclined upper side (upstream side of the molten glass Gm) and a low temperature region provided on the inclined lower side (downstream side of the molten glass Gm) along the axis of the molded body 2 (sleeve). Have In the illustrated example of FIG. 1, in the molding chamber 3, the left side from the center in the thickness direction of the support wall 8b is the high temperature region H, and the right side from the center in the thickness direction of the support wall 8b is the low temperature region L. The temperature in the high temperature region is, for example, 1200 to 900 ° C. The temperature in the low temperature region is, for example, 1100 to 700 ° C.

  In the manufacturing apparatus 1, while the air is ejected from the inner hole of the molded body 2 (sleeve), the molded body 2 is rotated around its axis, and the molten glass Gm is supplied from the feeder 7 onto the molded body 2. The tubular glass Gt is manufactured by pulling the molten glass Gm that has flowed 2 in the lateral direction by a not-shown tube drawing device.

  Next, the partition 4 which is a feature of the present invention will be described in detail.

  The partition wall 4 includes an oxidation resistant part 10 and a heat equalizing part 11 disposed in at least a partial region of the oxidation resistant part 10 on the molding chamber 3 side. The oxidation resistant part 10 is made of an oxide refractory. The soaking part 11 is made of a non-oxide refractory having a higher thermal conductivity than the oxidation-resistant part 10.

  In the present embodiment, the soaking part 11 is disposed in the entire region of the oxidation resistant part 10 on the molding chamber 3 side. However, the present invention is not limited to this, and as shown in FIG. 3, the soaking part 11 may be disposed only in the high temperature region (left side in FIG. 3) of the molding chamber 3. Moreover, as shown in FIG. 4, the soaking | uniform-heating part 11 may be arrange | positioned only at the bottom side (lower side in FIG. 4) of the molding chamber 3. As shown in FIG.

  The method of disposing the soaking part 11 on the oxidation resistant part 10 is not particularly limited. For example, the soaking part 11 may be bonded using an adhesive or the like. Just place it.

  Examples of the oxide refractory used for the oxidation resistant portion 10 include alumina zircon refractory, mullite refractory, alumina refractory, and the like. In addition, when the soaking part 11 is arrange | positioned in the whole region of the oxidation-resistant part 10 like this embodiment, it is not necessary to consider in particular, However, Soaking part in the whole region of the oxidation-resistant part 10 When 11 is not disposed, the oxide refractory used for the oxidation resistant portion 10 is preferably one that does not cause a problem with the volatile component of the molten glass Gm.

In the present invention, the alumina zircon refractory is a refractory having a total amount of Al ₂ O ₃ , ZrO ₂ and SiO ₂ of 90 mass% or more. The mullite refractory is a refractory having mullite (3Al ₂ O ₃ .2SiO ₂ ) of 90 mass% or more. The alumina refractory is a refractory having Al ₂ O ₃ of 80 mass% or more.

  Examples of the non-oxide refractory used for the soaking part 11 include a silicon carbide refractory, an aluminum nitride refractory, and a silicon nitride refractory. In addition, the non-oxide type refractory used for the soaking | uniform-heating part 11 has a preferable material which a reaction with the volatile component of molten glass Gm does not produce a problem.

In the present invention, the silicon carbide refractory is a refractory having SiC of 35 mass% or more. The aluminum nitride refractory is a refractory having an AlN of 80 mass% or more. The silicon nitride refractory is a refractory having a Si ₃ N ₄ content of 15 mass% or more.

  The thermal conductivity of the non-oxide refractory used for the soaking part 11 is preferably 8 W / m · K or more, more preferably 10 W / m · K or more, and most preferably 13 W / m · K or more. When the thermal conductivity of the non-oxide refractory is less than 8 W / m · K, the soaking action may not be sufficiently obtained.

  The manufacturing apparatus 1 of the present invention configured as described above can enjoy the following effects.

  The partition wall 4 includes an oxidation resistant part 10 and a soaking part 11. Since the oxidation resistant portion 10 is made of an oxide refractory that is difficult to oxidize, it has oxidation resistance. And since the soaking | uniform-heating part 11 consists of a non-oxide type refractory material whose heat conductivity is higher than the oxidation-resistant part 10, it has a soaking | uniform-heating action. The non-oxide refractory of the soaking part 11 is inferior in oxidation resistance, but the soaking part 11 is disposed on the molding chamber 3 side in the oxidation resistant part 10 and does not come into contact with residual oxygen in the exhaust gas. So it is difficult to oxidize. Thus, the partition 4 is comprised by the oxidation-resistant part 10 and the soaking | uniform-heating part 11, and has oxidation resistance and a soaking | uniform-heating action. That is, according to the glass article manufacturing apparatus 1 of the present embodiment, a soaking action can be imparted to the partition walls together with oxidation resistance.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the technical idea. For example, in the above embodiment, the glass article manufacturing apparatus manufactures tubular glass by the Danner method. However, the present invention is not limited to this, and for example, plate glass is manufactured by the overflow downdraw method or the like. You may do.

1 Glass article manufacturing equipment 2 Molded body (sleeve)
3 Molding chamber 4 Partition 5 Combustion chamber 6 Burner 10 Oxidation resistant portion 11 Heat equalizing portion Gm Molten glass Gt Tubular glass (glass article)

Claims (6)

A glass article comprising a molded body for molding molten glass, a molding chamber in which the molded body is disposed, a combustion chamber for heating the molding chamber via a partition, and a burner for heating the combustion chamber is manufactured. In manufacturing equipment,
The partition wall is disposed in an oxidation-resistant portion made of an oxide-based refractory and at least a partial region on the molding chamber side in the oxidation-resistant portion, and has a higher thermal conductivity than the oxidation-resistant portion. A soaking part made of non-oxide refractory ,
The oxide-based refractory and the non-oxide-based refractory are plate-shaped members, respectively .   The apparatus for manufacturing a glass article according to claim 1, wherein the non-oxide refractory is a silicon carbide refractory.   The apparatus for producing a glass article according to claim 1 or 2, wherein the oxide-based refractory is an alumina zircon refractory.   The said molded object is a sleeve rotationally driven around the inclined axis line, The manufacturing apparatus of the glass article of any one of Claims 1-3 characterized by the above-mentioned. The molding chamber has a high temperature region provided on the inclined upper side and a low temperature region provided on the inclined lower side along the axis of the sleeve,
The apparatus for producing a glass article according to claim 4, wherein the soaking part is disposed at least in the high temperature region.   The apparatus for manufacturing a glass article according to claim 4 or 5, wherein the soaking part is disposed only on the bottom side of the molding chamber.

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