JP2023084387A - Glass transfer device, device for manufacturing glass article and method for manufacturing glass article - Google Patents

Abstract

To reliably inhibit a flange part of a transfer pipe from being worn due to overheat.SOLUTION: A glass transfer device includes: a transfer pipe 7 for transferring a molten glass GM; and a holding brick 8 for holding the transfer pipe 7. The transfer pipe 7 includes: a tubular body part 9 through which the molten glass GM circulates; a flange part 10 installed to the body part 9; and an electrode part 11 for energizing the flange part 10. The flange part 10 is provided with a heat shielding member 18.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a glass transfer apparatus for transferring molten glass, a glass article manufacturing apparatus, and a glass article manufacturing method.

Plate glass is used as a glass substrate or a cover glass for panel displays such as liquid crystal displays and organic EL displays.

For example, Patent Literature 1 discloses an apparatus for manufacturing sheet glass. This manufacturing apparatus includes a melting tank serving as a supply source of molten glass, a clarification tank provided downstream of the melting tank, a homogenization tank provided downstream of the clarification tank, and a homogenization tank downstream of the homogenization tank. a pot provided, a molded body provided downstream of the pot, and a glass feed channel interconnecting these components. The clarification tank, homogenization tank, pot, and glass supply path are made of precious metal such as platinum, and have a function as a glass transfer device that controls the temperature of the molten glass and transfers it to the downstream side.

The glass transfer device includes a transfer pipe for transferring molten glass and holding bricks (refractory bricks) for holding the transfer pipe. The transfer pipe includes a tubular main body portion for transferring the molten glass, a flange portion provided on the main body portion, and an electrode portion for energizing the flange portion. The flange portion and the electrode portion function as a heating device for controlling the temperature of the molten glass.

WO2019/045099

During operation after completion of the assembly process, preheating process, etc., the main body is energized and heated by electric current supplied from the electrode part and the flange part, and high-temperature molten glass flows therein. Therefore, the main body tends to reach a high temperature. As a result, the flange portion may be overheated by the radiant heat from the main body portion which has reached a high temperature. When the flange portion is overheated in this manner, the flange portion may be oxidized and worn. In particular, if the flow rate of the molten glass is increased for the purpose of improving productivity, etc., the amount of heat per unit time brought into the transfer pipe by the molten glass increases, so the flange portion is easily worn due to overheating.

An object of the present invention is to reliably suppress wear and tear of a flange portion of a transfer pipe due to overheating.

(1) The present invention, invented to solve the above problems, is a glass transfer device comprising a transfer pipe for transferring molten glass and holding bricks for holding the transfer pipe, wherein the transfer pipe comprises molten glass comprising a tubular main body through which is circulated, a flange provided in the main body, and an electrode for energizing the flange, wherein the flange is provided with a heat shielding member. .

With this configuration, the heat shield member can reduce the radiant heat from the main body, so that the flange can be prevented from being overheated and worn by the radiant heat from the main body.

(2) In the configuration of (1) above, the end of the transfer pipe protrudes from the holding brick, the flange is provided at the end of the transfer pipe, and the heat shield member is provided at the end of the transfer pipe. part, it is preferably provided on the holding brick side of the flange part.

The side of the flange portion opposite to the holding brick is not directly affected by the radiant heat from the transfer pipe because the flange portion or the like of another adjacent transfer pipe abuts against it. Therefore, by providing a heat shield member on the holding brick side of the flange portion, the radiant heat from the body portion can be efficiently reduced.

(3) In the configuration of (1) or (2) above, the flange portion includes an inner flange portion made of noble metal and an outer flange portion made of non-noble metal provided on the outer circumference of the inner flange portion, and the outer flange portion The thickness of the portion is preferably greater than the thickness of the inner flange portion.

By doing so, it is possible to reduce the cost of the flange portion by reducing the amount of precious metal (for example, platinum or platinum alloy) used. On the other hand, the outer flange portion made of non-noble metal (for example, nickel or nickel alloy) has a problem that it is more likely to be worn by heat such as heat generated by the electrode portion when energized, compared to the inner flange portion made of noble metal. Therefore, in the above configuration, the thickness of the outer flange portion made of non-noble metal is made larger than the thickness of the inner flange portion made of noble metal, so that the volume of the outer flange portion becomes relatively large. As a result, the outer flange is less likely to be overheated than in the case where the thickness of the outer flange made of non-noble metal is approximately the same as the thickness of the inner flange made of noble metal.

(4) In the configuration of (3) above, the outer flange portion has a stepped portion between the flange surface of the outer flange portion and the flange surface of the inner flange portion, and the heat shield member extends along the stepped portion. It is preferred to have a first heat shield provided.

The stepped portion of the outer flange portion is susceptible to radiant heat from the body portion. Therefore, it is preferable to provide the first heat shield member to protect the stepped portion from the radiant heat of the main body portion.

(5) In the configuration of (4) above, the heat shield preferably has a second heat shield provided along at least one of the flange surface of the inner flange portion and the flange surface of the outer flange portion.

The flange surface of the inner flange portion and the flange surface of the outer flange portion are less susceptible to wear due to radiant heat from the body portion than the step portion of the outer flange portion. However, these parts may also be worn by radiant heat from the main body. Therefore, it is preferable to provide a second heat shield member to protect the flange surface of the inner flange portion and the flange surface of the outer flange portion from the radiant heat of the main body portion.

(6) In the configuration of (5) above, it is preferable that the first heat shield member is refractory brick and the second heat shield member is refractory fiber.

Refractory bricks have the advantage of exhibiting a stable heat shielding effect over a long period of time with little deterioration due to heat. On the other hand, refractory fibers are easier to install than refractory bricks, but have the disadvantage of being easily deteriorated by heat. Therefore, in the above configuration, a refractory brick is provided as a first heat shield member at the stepped portion where wear is likely to occur due to radiant heat from the main body, and the flange surface and / Or the flange surface of the outer flange portion is provided with refractory fiber as a second heat shield member. As a result, it is possible to reliably suppress the wear of the flange portion while suppressing the complication of the installation work of the heat shield member.

(7) In any one of the configurations (4) to (6) above, it is preferable to provide a restricting member that restricts positional displacement of the first heat shield member with respect to the stepped portion in the longitudinal direction of the main body portion.

With this configuration, even if the main body expands in the longitudinal direction due to thermal expansion in a preheating step or the like before operation, the regulating member regulates the displacement of the first heat shield member with respect to the stepped portion. Therefore, even if the main body thermally expands, the stepped portion can be reliably protected from the radiant heat of the main body by the first heat shield member.

(8) In any one of the configurations (3) to (7) above, the outer flange portion may be made of nickel or a nickel alloy.

In this way, although the electrical resistance of the electrode portion when energized can be reduced, the main body portion is likely to be worn due to radiant heat. In other words, the effect of the present invention is that it is possible to suppress wear due to overheating of the flange portion, which is particularly useful.

(9) In any one of the above configurations (1) to (8), it is preferable that a cooling device for cooling the flange portion is provided, and the cooling device uses gas as a coolant.

In this way, a water supply/discharge device or a tank becomes unnecessary, and equipment costs and the like can be reduced. On the other hand, cooling using gas (e.g., air) as a coolant tends to have a lower cooling effect on the flange than cooling using water as a coolant, and wear of the flange due to radiant heat from the main body becomes apparent. Cheap. In other words, the effect of the present invention that it is possible to suppress wear due to overheating of the flange portion becomes more useful.

(10) The present invention, invented to solve the above problems, is a glass article manufacturing apparatus for manufacturing a glass article from molten glass, comprising any one of the above configurations (1) to (9). and a glass transfer device comprising:

In this way, the same advantages as those of the corresponding configuration already described can be obtained.

(11) The present invention, invented to solve the above problems, is a method for producing a glass article from molten glass, comprising any one of the configurations (1) to (9) above. It is characterized by including a step of transferring molten glass by means of a glass transfer device.

In this way, the same advantages as those of the corresponding configuration already described can be obtained.

ADVANTAGE OF THE INVENTION According to this invention, it can suppress reliably that the flange part of a transfer pipe wears by overheating.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the manufacturing apparatus of the glass article which concerns on 1st embodiment. It is a sectional view showing a glass transfer device concerning a first embodiment. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; It is sectional drawing which expands and shows the edge part periphery of the transfer pipe|tube contained in the glass transfer apparatus which concerns on 2nd embodiment. FIG. 5 is a cross-sectional view of the glass transfer device of FIG. 4 corresponding to the AA cross-sectional view of FIG. 2; It is sectional drawing which expands and shows the edge part periphery of the transfer pipe|tube contained in the glass transfer apparatus which concerns on 2nd embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates, referring drawings for the form for implementing this invention. In addition, overlapping description may be omitted by attaching the same reference numerals to the corresponding constituent elements in each embodiment. When only a part of the configuration is described in each embodiment, the configurations of other embodiments previously described can be applied to other portions of the configuration. In addition to combinations of configurations explicitly specified in the description of each embodiment, configurations of a plurality of embodiments can be partially combined even if they are not specified unless there is a particular problem with the combination.

(First embodiment)
As shown in FIG. 1, the apparatus for manufacturing glass articles according to the first embodiment includes, in order from the upstream side, a dissolution tank 1, a clarification tank 2, a homogenization tank (stirring tank) 3, a pot 4, a molding It comprises a body 5 and glass supply channels 6a-6d connecting each of these components 1-5. In addition, although not shown, the manufacturing apparatus includes a slow cooling furnace for slowly cooling the glass ribbon GR formed by the molded body 5 and a cutting device for cutting the glass ribbon GR after slow cooling.

The melting tank 1 is a vessel for carrying out a melting step of melting the supplied frit to obtain molten glass GM. The melting tank 1 is connected to the fining tank 2 by a glass feed line 6a.

The clarification tank 2 is a container for carrying out a clarification process in which the molten glass GM is transferred and defoamed by the action of a clarifier or the like. The fining tank 2 is connected to the homogenizing tank 3 by a glass feed line 6b.

The homogenization tank 3 is a tubular vessel with a bottom for performing the process of stirring and homogenizing the clarified molten glass GM (homogenization process). The homogenization tank 3 is provided with a stirrer 3a having stirring blades. The homogenization vessel 3 is connected to the pot 4 by a glass feed channel 6c.

The pot 4 is a container for performing a conditioning step of conditioning the molten glass GM to a state suitable for molding. The pot 4 functions, for example, as a volume for adjusting the viscosity and flow rate of the molten glass GM. The pot 4 is connected to the molding 5 by a glass feed channel 6d.

The formed body 5 is formed by forming the molten glass GM into a plate shape by the overflow downdraw method. The molded body 5 has a substantially wedge-shaped cross-sectional shape (a cross-sectional shape perpendicular to the plane of FIG. 1). An overflow groove (not shown) is formed in the upper portion of the compact 5 .

The molded body 5 causes the molten glass GM to overflow from the overflow groove and flow down along both side wall surfaces of the molded body 5 (side surfaces located on the front and back sides of the paper surface). The formed body 5 fuses the flowing molten glass GM at the lower top portion of the side wall surface. Thereby, a strip-shaped glass ribbon GR is formed. The glass ribbon GR is cut by a cutting device after passing through a slow cooling furnace to obtain sheet glass (glass article) having a desired size.

The sheet glass thus obtained has a thickness of, for example, 0.01 to 10 mm, and is used for panel displays such as liquid crystal displays and organic EL displays, organic EL lighting, and substrates and protective covers for solar cells. . The compact 5 may be formed by another down-draw method such as the slot down-draw method, or a molding apparatus using the float method may be used in place of the compact 5 . Glass articles manufactured by the manufacturing apparatus are not limited to plate glass, and include glass rolls obtained by winding glass ribbons into rolls, glass tubes, and other various shapes. For example, when forming a glass tube, instead of the formed body 5, a forming apparatus using the Danner method is provided.

As the composition of plate glass, silicate glass and silica glass are used, preferably borosilicate glass, soda lime glass, aluminosilicate glass and chemically strengthened glass are used, and alkali-free glass is most preferably used. Here, the alkali-free glass is a glass that does not substantially contain an alkali component (alkali metal oxide), and specifically, a glass in which the weight ratio of the alkali component is 3000 ppm or less. be. The weight ratio of the alkaline component is preferably 1000 ppm or less, more preferably 500 ppm or less, and most preferably 300 ppm or less.

The glass supply paths 6a to 6d, the clarification tank 2, the homogenization tank 3, and the pot 4 function as a glass transfer device for transferring the molten glass GM.

The glass supply paths 6a to 6d, etc. as a glass transfer device are provided with a transfer pipe 7 for transferring the molten glass GM and holding bricks 8 for holding the transfer pipe 7 (see FIG. 2). The glass supply paths 6a to 6d and the like may be composed of a single transfer pipe 7. Alternatively, the glass supply paths 6a to 6d and the like may be configured by connecting a plurality of transfer pipes 7. FIG.

As shown in FIGS. 2 and 3, the transfer pipe 7 includes a body portion 9, a flange portion 10 provided on the outer peripheral portion (outer peripheral surface) of the body portion 9, and an electrode portion functioning together with the flange portion 10 as a heating device. 11 and a cooling device 12 that cools the flange portion 10 and the electrode portion 11 .

The main body 9 is made of a noble metal such as platinum or a platinum alloy and has a tubular shape (for example, a cylindrical shape). The body portion 9 transfers the molten glass GM from one end side (upstream side) to the other end side (downstream side) by passing the molten glass GM inside.

A portion of the outer peripheral portion of the body portion 9 excluding the ends in the longitudinal direction of the body portion 9 is held by the holding bricks 8 . That is, the longitudinal ends of the body portion 9 protrude from the retaining bricks 8 . The holding bricks 8 are arranged so as to surround the entire circumference of the body portion 9 .

A longitudinal end portion 8a of the retaining brick 8 is provided with a notch for receiving an outer flange portion 15, which will be described later, and the cross-sectional shape of the outer peripheral surface of the end portion 8a is circular. On the other hand, the intermediate portion 8b of the holding brick 8 in the longitudinal direction has a rectangular cross-sectional shape on the outer peripheral surface. The inner peripheral surface of the end portion 8 a and the inner peripheral surface of the intermediate portion 8 b have the same diameter, and are both joined to the outer peripheral surface of the main body portion 9 by the joining layer 13 . The holding brick 8 is divided into a plurality of (for example, upper and lower two) divided bodies (not shown) around the body portion 9 . By constructing the holding bricks 8 from divided bodies in this way, the installation work of the holding bricks 8 is facilitated.

The holding bricks 8 are made of heat-insulating refractory bricks. As the refractory brick, for example, an alumina-based or zirconia-based electroformed refractory, an alumina-based or silica-based fired refractory, or the like can be used.

As the bonding layer 13 that bonds the main body portion 9 and the holding brick 8, for example, a diffusion bonding material containing alumina powder and silica powder, alumina cement, or the like can be used. Here, the diffusion-bonded body is a bonded body formed by filling the space between the body portion 9 and the holding brick 8 with raw material powder and then performing diffusion bonding by heating. Diffusion bonding refers to a method in which powders are brought into contact with each other and bonded using diffusion of atoms occurring between contact surfaces. The filling of the raw material powder of the diffusion bonded body is performed, for example, in an assembly process before operation, and the heating of the powder that is the raw material of the diffusion bonded body is performed, for example, by turning the glass transfer device (glass supply paths 6a to 6d, etc.) during operation. It is carried out in the transfer step of transferring the molten glass GM using

The flange portion 10 is provided at the longitudinal end portion of the body portion 9 . The flange portion 10 is disc-shaped and formed so as to surround the entire circumference of the body portion 9 . The flange portion 10 is configured (welded) integrally with the body portion 9 so as to be concentric with the body portion 9 .

The flange portion 10 includes an inner flange portion 14 and an outer flange portion 15 integrally fixed to the outer periphery of the inner flange portion 14 .

The inner flange portion 14 is made of precious metal such as platinum or platinum alloy. The inner flange portion 14 is configured integrally with each end portion of the body portion 9 . The outer flange portion 15 is made of a non-noble metal such as nickel or a nickel alloy and has an annular shape (for example, an annular shape). The outer flange portion 15 is formed integrally with the inner flange portion 14 by joining the inner peripheral portion thereof and the outer peripheral portion of the inner flange portion 14 by welding.

The thickness T2 of the outer flange portion 15 is larger than the thickness T1 of the inner flange portion 14 . On the holding brick 8 side, the outer flange portion 15 has a stepped portion 16 extending along the longitudinal direction of the body portion 9 between the flange surface 15a of the outer flange portion 15 and the flange surface 14a of the inner flange portion 14. . On the opposite side of the holding brick 8, the flange surface 15b of the outer flange portion 15 and the flange surface 14b of the inner flange portion 14 are flush with each other, and are not shown in the figure (for example, the flange portion of the adjacent transfer pipe). Butted.

The electrode portion 11 is formed in a plate shape from nickel or a nickel alloy. The electrode portion 11 of the present embodiment is provided integrally with the upper portion of the flange portion 10 (outer flange portion 15). A power source (not shown) is connected to the electrode portion 11 . In addition, the electrode portion 11 may be provided on the lower portion or side portion of the flange portion 10 (outer flange portion 15).

The cooling device 12 has a cooling channel 17 through which a coolant made of gas such as air is passed. The cooling channel 17 is formed into a predetermined shape by bending a metal single pipe. Specifically, the cooling channel 17 has an annular portion 17a having a predetermined diameter and a pair of straight portions 17b connected to the ends of the annular portion 17a.

The annular portion 17a is fixed to one surface of the outer flange portion 15 (flange surface 15a in the illustrated example) along the periphery of the outer flange portion 15 . Straight portion 17 b is fixed to one surface of electrode portion 11 along the edge of electrode portion 11 . The flow path shape and arrangement position of the cooling flow path 17 are not particularly limited. The cooling channel 17 may be formed inside the electrode portion 11 and/or the outer flange portion 15 .

A heat shield member 18 is provided on the flange portion 10 . The heat shield member 18 is provided along the first heat shield member 19 provided along the stepped portion 16 of the outer flange portion 15, the flange surface 14a of the inner flange portion 14, and the flange surface 15a of the outer flange portion 15. A second heat shield member 20 is provided.

The first heat shield member 19 is a tubular body (for example, a cylinder) that is housed inside the stepped portion 16 . The first heat shield member 19 is fixed near the flange portion 10 without being fixed to the flange portion 10 . The first heat shield member 19 is preferably in contact with the stepped portion 16 . The first heat shield member 19 and the holding bricks 8 are not in contact with each other, but may be in contact with each other. However, when the first heat shield member 19 and the holding bricks 8 are in contact with each other, the first heat shield member 19 is not fixed to the holding bricks 8 and is relatively movable with respect to the holding bricks 8. preferable.

The tip of the end 8 a of the holding brick 8 is inserted into the inner peripheral surface of the first heat shield member 19 . That is, the first heat shield member 19 and the tip of the end portion 8a of the holding brick 8 have overlapping portions D in which the arrangement positions overlap each other when viewed in the radial direction of the main body portion 9 .

The first heat shield member 19 is divided around the body portion 9 into a plurality of (four in the illustrated example) divided bodies 19a. By constructing the first heat shield member 19 from the divided body 19a in this manner, the installation work of the first heat shield member 19 is facilitated.

The first heat shield member 19 is made of refractory bricks in this embodiment. As the refractory brick, for example, an alumina-based or zirconia-based electroformed refractory, an alumina-based or silica-based fired refractory, or the like can be used.

The second heat shield member 20 includes an inner annular body (for example, an annular shape) 20a that covers the flange surface 14a of the inner flange portion 14, and an outer annular body (for example, an annular shape) 20b that covers the flange surface 15a of the outer flange portion 15. Prepare. The second heat shield member 20 is fixed to the flange portion 10 by adhesion.

The second heat shield member 20 is made of refractory fiber in this embodiment. As the refractory fiber, for example, a blanket composed of alumina fiber, silica fiber, zirconia fiber, and blended fibers thereof can be used.

A method for manufacturing sheet glass using the manufacturing apparatus having the above configuration will be described below. In this method, during operation, the raw glass is melted in the melting tank 1 (melting process) to obtain the molten glass GM. A homogenization step by and a conditioning step by the pot 4 are performed. After that, the molten glass GM is transferred to the molded body 5, and a glass ribbon GR is formed from the molten glass GM by a molding process. After that, the glass ribbon GR is formed into a predetermined size through a slow cooling process using a slow cooling furnace and a cutting process using a cutting device to obtain a plate glass (glass article).

Then, the method includes a transfer step of transferring the molten glass GM using a glass transfer device (glass supply paths 6a to 6d, etc.) during the above steps. In this transfer step, a voltage is applied to the electrode portion 11 to heat the body portion 9 in order to control the temperature of the molten glass GM flowing in the body portion 9 of the transfer pipe 7 .

In this case, the body portion 9 becomes hot, and radiant heat is generated from the body portion 9 . If the flange portion 10 is overheated by this radiant heat, the flange portion 10 may be worn. In particular, the stepped portion 16 of the outer flange portion 15 made of non-precious metal is likely to be worn due to oxidation or the like. Therefore, a heat shield member 18 is provided on the flange portion 10 to prevent the flange portion 10 from being overheated and worn.

Specifically, the stepped portion 16 of the outer flange portion 15 is protected from the radiant heat of the main body portion 9 by a first heat shield member 19 made of refractory bricks. The flange surface 14a of the inner flange portion 14 and the flange surface 15a of the outer flange portion 15 are protected from the radiant heat of the main body portion 9 by the second heat shield member 20 made of refractory fiber.

Refractory bricks have the advantage of exhibiting a stable heat shielding effect over a long period of time with little deterioration due to heat. On the other hand, refractory fibers are easier to install than refractory bricks, but have the disadvantage of being easily deteriorated by heat.

Since the stepped portion 16 of the outer flange portion 15 is made of a non-noble metal and is relatively close to the body portion 9, it is most susceptible to wear. On the other hand, the flange surface 14 a of the inner flange portion 14 is close to the main body portion 9 , but is made of noble metal, so that it is less susceptible to wear than the stepped portion 16 . The flange surface 15 a of the outer flange portion 15 is made of a non-noble metal, but is separated from the main body portion 9 , so that it is less susceptible to wear than the stepped portion 16 .

Therefore, a first heat shield member 19 made of refractory bricks is provided at the stepped portion 16 which is likely to be worn by the radiant heat from the main body portion 9 . A second heat shield member 20 made of refractory fiber is provided on the flange surface 14a of the inner flange portion 14 and the flange surface 15a of the outer flange portion 15, which are relatively less likely to be worn by radiant heat from the body portion 9. As shown in FIG. As a result, it is possible to reliably suppress wear and tear of the flange portion 10 due to overheating caused by radiant heat from the main body portion 9 while suppressing the installation work of the heat shield member 18 from becoming complicated.

In addition to this, the cooling device 12 circulates gaseous refrigerant (for example, air) in the cooling flow path 17 to cool the flange portion 10 (mainly the outer flange portion 15). As a result, wear of the flange portion 10 due to overheating can be suppressed more reliably. A water-cooled type cooling device requires facilities for supplying and discharging water, which increases the facility cost. Moreover, when a water leak occurs, there is a possibility of leading to a serious accident. On the other hand, in this embodiment, since the cooling device 12 uses gas as a refrigerant, only a device for supplying the refrigerant is required, and equipment for recovering the discharged refrigerant is not required, thereby significantly reducing the equipment cost. In addition, it is possible to prevent serious accidents from occurring due to water leakage.

When a gaseous refrigerant (for example, air) is circulated through the cooling passage 17, the cooling capacity is lower than that of the water cooling system, so that the flange portion 10 is significantly worn due to overheating. Therefore, if the heat shield member 18 of the present invention is applied, the effect of suppressing wear due to overheating of the flange portion 10 becomes remarkable.

(Second embodiment)
As shown in FIGS. 4 and 5, the glass transfer device according to the second embodiment differs from the glass transfer device according to the first embodiment in that the stepped portion in the longitudinal direction of the body portion 9 of the transfer pipe 7 16 is provided with a regulating member 21 for regulating displacement of the first heat shield member 19 with respect to 16 .

The regulating member 21 is composed of a plurality of engaging claws 21 a that can be engaged with the first heat shield member 19 . A proximal end portion of the engaging claw 21a is fixed to the flange surface 15a of the outer flange portion 15 by welding. In this state, the tip of the engaging claw 21a protrudes inward from the stepped portion 16. As shown in FIG. That is, the engaging claw 21 a can engage with the end surface 19 b of the first heat shield member 19 accommodated inside the stepped portion 16 on the holding brick 8 side. The base end portion of the engaging claw 21a may be fixed to the stepped portion 16 of the outer flange portion 15 by welding.

A plurality of engaging claws 21 a (two each in the illustrated example) are arranged at positions corresponding to the end surfaces of the divided bodies 19 a of the first heat shield member 19 .

The regulating member 21 (engagement claw 21a) is made of, for example, a noble metal such as platinum or a platinum alloy, or heat-resistant steel.

With this configuration, as shown in FIG. 6, even if the body portion 9 is elongated in the longitudinal direction due to thermal expansion as indicated by the dashed line in the drawing during a preheating step before operation, the restricting member 21 is not engaged. Positional deviation of the first heat shield member 19 with respect to the stepped portion 16 is restricted by the matching pawl 21a. Specifically, when the body portion 9 thermally expands, the flange portion 10 also moves together with the body portion 9 . At this time, the engaging claw 21 a of the restricting member 21 provided on the outer flange portion 15 engages with the end face 19 b of the first heat shield member 19 . Due to this engagement, the first heat shield member 19 also moves together with the flange portion 10 so as to follow the thermal expansion of the body portion 9 . Therefore, even if the body portion 9 thermally expands, the stepped portion 16 is always protected by the first heat shield member 19 , so that wear of the stepped portion 16 due to the radiant heat of the body portion 9 can be reliably suppressed.

The configuration of the restricting member 21 is not particularly limited as long as it can restrict the positional deviation of the first heat shield member 19 with respect to the stepped portion 16 . For example, one of the stepped portion 16 and the first heat shield member 19 is provided with a protrusion, the other of the stepped portion 16 and the first heat shield member 19 is provided with a recess, and the protrusion and the recess are fitted. You may constitute a regulation member by this.

Here, the preheating step is a step in which the constituent elements 1 to 5 and 6a to 6d of the manufacturing apparatus are individually separated and heated to sufficiently expand. The preheating step is followed by the assembly step of connecting the components 1-5, 6a-6d to each other. The preheating process and the assembly process are processes performed before operation.

In this case, the bonding layer 13 that bonds the main body 9 and the holding brick 8 is preferably composed of a diffusion bonded material containing alumina powder and silica powder. In this way, in the preheating step in which the main body 9 thermally expands, the bonding layer 13 is in the state of the powder P (see FIG. 6) that is the raw material of the diffusion bonding, and the thermal expansion of the main body 9 is sufficiently prevented. acceptable. Therefore, expansion of the main body portion 9 is inhibited, and damage or deformation of the main body portion 9 can be prevented.

The overlapping portion D (see FIG. 4) between the first heat shield member 19 and the end portion 8a of the holding brick 8 during operation is caused by the thermal expansion of the main body portion 9, and the first heat shield member 19 and the holding brick during the preheating process. 8 may be smaller than the overlapping portion D0 (see FIG. 6) with the end portion 8a of . In other words, the gap S (see FIG. 4) between the inner flange portion 14 (or the inner annular portion 20a of the second heat shield member 20) and the end portion 8a of the retaining brick 8 during operation is When it becomes larger than the gap S0 (see FIG. 6) between the inner flange portion 14 (or the inner annular portion 20a of the second heat shield member 20) and the end portion 8a of the retaining brick 8 during the preheating step due to thermal expansion. There is Even in this case, the regulation member 21 keeps the stepped portion 16 protected by the first heat shield member 19, so that the radiant heat of the main body portion 9 is prevented from directly acting on the stepped portion 16 through the enlarged gap S1. can be prevented.

In addition, the present invention is not limited to the configuration of the above-described embodiment, nor is it limited to the above-described effects. Various modifications can be made to the present invention without departing from the gist of the present invention.

In the above-described embodiment, the flange portion 10 is provided at the longitudinal end portion of the body portion 9 , but may be provided in the middle portion of the body portion 9 . When the flange portion 10 is provided at the longitudinal end portion of the body portion 9 , the flange portion 10 on the opposite side of the holding brick 8 is abutted against the flange portion of another adjacent transfer pipe or the like. Therefore, radiant heat from the body portion 9 can be efficiently reduced simply by providing the heat shield member 18 on the holding brick 8 side of the flange portion 10 . On the other hand, when the flange portion 10 is provided in the middle portion of the main body portion 9 , it is preferable to provide heat shielding members 18 on both sides of the flange portion 10 .

In the above embodiment, the second heat shield member 20 is provided on each of the flange surface 14a of the inner flange portion 14 and the flange surface 15a of the outer flange portion 15. may be provided only on the flange surfaces 14a and 15a. Alternatively, the second heat shield member 20 may be omitted.

In the above embodiment, the case where the thickness T2 of the outer flange portion 15 is greater than the thickness T1 of the inner flange portion 14 and the outer flange portion 15 has the stepped portion 16 has been described, but the present invention is not limited to this. The thickness T2 of the outer flange portion 15 and the thickness T1 of the inner flange portion 14 may be approximately the same, and the step portion 16 of the outer flange portion 15 may be omitted. In this case, it is preferable to arrange a heat shielding member made of refractory bricks along the flange surface 15a of the outer flange portion 15 to protect the flange surface 15a of the outer flange portion 15 from the radiant heat of the main body portion 9.

In the above embodiment, the cooling device 12 may include a fan that blows air to the flange portion 10 from the outside. In this case, the cooling flow path 17 of the cooling device 12 may be omitted, or may be used together with ventilation by a fan.

In the above embodiment, a thermometer for measuring the temperature of the flange portion 10 such as the step portion 16 may be provided. In this way, the deteriorated state of the heat shield member 18 such as the first heat shield member 19 can be predicted based on the measurement result of the thermometer.

1 Dissolving tank 2 Clarifying tank 3 Homogenizing tank 4 Pot 5 Molded body 6a to 6d Glass supply path 7 Transfer pipe 8 Holding brick 9 Body part 10 Flange part 11 Electrode part 12 Cooling device 13 Bonding layer 14 Inner flange part 15 Outer flange part 16 Stepped portion 18 Heat shielding member 19 First heat shielding member 19a Divided body 20 Second heat shielding member 20a Inner annular body 20b Outer annular body 21 Regulating member 21a Engagement claw

Claims (11)

A glass transfer device comprising a transfer pipe for transferring molten glass and holding bricks for holding the transfer pipe,
The transfer pipe includes a tubular main body portion through which the molten glass flows, a flange portion provided on the main body portion, and an electrode portion for energizing the flange portion,
The glass transfer device, wherein the flange portion is provided with a heat insulating member. an end of the transfer tube protruding from the retaining brick;
The flange portion is provided at the end portion of the transfer pipe,
2. The glass transfer device according to claim 1, wherein the heat shield member is provided on the holding brick side of the flange portion at the end portion of the transfer pipe. The flange portion includes an inner flange portion made of a noble metal and an outer flange portion made of a non-noble metal provided on the outer periphery of the inner flange portion,
The glass transfer device according to claim 1 or 2, wherein the thickness of the outer flange portion is larger than the thickness of the inner flange portion. The outer flange portion has a stepped portion between the flange surface of the outer flange portion and the flange surface of the inner flange portion,
4. The glass transfer device according to claim 3, wherein the heat shield member has a first heat shield member provided along the stepped portion. 5. The glass transfer device according to claim 4, wherein the heat shield member has a second heat shield member provided along at least one of the flange surface of the inner flange portion and the flange surface of the outer flange portion. The first heat shield member is a refractory brick,
6. The glass transfer device according to claim 5, wherein the second heat shield member is refractory fiber. The glass transfer device according to any one of claims 4 to 6, further comprising a regulating member that regulates displacement of the first heat shield member with respect to the stepped portion in the longitudinal direction of the body portion. The glass transfer device according to any one of claims 3 to 7, wherein the outer flange portion is made of nickel or nickel alloy. The glass transfer device according to any one of claims 1 to 8, further comprising a cooling device for cooling the flange portion, wherein the cooling device uses gas as a coolant. A glass article manufacturing apparatus for manufacturing glass articles from molten glass,
An apparatus for manufacturing glass articles, comprising the glass transfer apparatus according to any one of claims 1 to 9. A method for producing a glass article from molten glass, comprising:
A method for producing a glass article, comprising the step of transferring the molten glass by the glass transfer device according to any one of claims 1 to 9.

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