JPH0920521A - Method of heating multi-directional conductive tube - Google Patents

Abstract

(57) [Summary] [Structure] A single-phase alternating current ib was supplied to the lower ends of the introduction pipe 16 and the riser cell 18 of the four-way conductive pipe. In addition, a single-phase alternating current id having a phase difference of 60 ° with the single-phase alternating current ib is supplied to the lower end of the rising pipe cell 18 and the bypass pipe 34, and the single-phase alternating current id is supplied to the bypass pipe 34 and the upper end of the rising pipe cell 18. AC current i
A single-phase alternating current ic having a phase difference of 60 ° with d was supplied. Therefore, the current density becomes uniform over the entire four-way conductive tube. [Effect] The current density is made uniform over the entire area of the four-way conductive tube.
By uniformly heating the entire area of the rectangular conductive tube, it is possible to prevent bubbles from being generated in the molten glass G and prevent cracks from being generated in the conduit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies a heating current to a four-way conductive tube formed of a noble metal member such as platinum so that the flow path of a high-temperature molten glass such as high-temperature molten glass extends in four directions. The present invention relates to a method for heating a four-way conductive tube for heating a four-way conductive tube.

[0002]

2. Description of the Related Art A vacuum degassing apparatus 10 shown in FIG. 2 is used in a process of degassing molten glass G as a high temperature molten material in a melting tank and continuously supplying it to the next processing furnace. is there. That is, the molten glass G supplied from the melting tank (not shown) is supplied to the first stirrer tube 14 via the conduit 12. The molten glass G supplied to the first stirrer tube 14 is agitated by a stirrer (not shown) and guided to the introducing pipe 16, and the molten glass G guided to the introducing pipe 16 passes through the rising pipe cell 18 and the rising pipe 20. And is introduced into the vacuum degassing tank 22. Then, bubbles are removed from the molten glass G introduced into the vacuum degassing tank 22, and the bubbles are continuously supplied to the next processing furnace through the downcomer 24.

In this case, the molten glass G is 1200 to 14
Since it is necessary to maintain the temperature at a high temperature of about 00 °,
Molten glass G conduit (conduit 12, first stirrer tube 1
4, the introduction pipe 16, the rising pipe cell 18, the rising pipe 20, the vacuum degassing tank 22, and the descending pipe 24) are formed of a noble metal member such as platinum. In order to maintain good homogeneity of the molten glass G, it is necessary to uniformly heat each conduit, and the current density supplied to each conduit must be kept constant.

As shown in FIG. 3, the first stirrer tube 1
4, the feed pipes 30, the riser cell 18, and the riser pipe 20 are provided with power supply terminals 30A, 30B ...
The power supplies 32A, 32B ... Are electrically connected to the power supply terminals 30A, 30B. The power supplies 32A, 32B ... Supply a single-phase alternating current of a commercial power supply (hereinafter referred to as a three-phase power supply). That is, the power supply 32A is connected to the power supply terminals 30A and 30B.
Are electrically connected to each other, and the power supply 32B is electrically connected to the power supply terminals 30B and 30C. And power supply 32A
Single-phase alternating current ia for heating and power source 32B supplied from
The current magnitudes of the heating single-phase alternating current ib supplied from the respective components are set to be equal (| ia | = | i
b |).

Further, as shown in FIG. 4, single-phase alternating current i
The phase difference between a and the single-phase alternating current ib is set to 60 °. Therefore, the combined current (ia + ib) of the single-phase alternating current ia and the single-phase alternating current ib has a magnitude of the single-phase alternating current i.
It becomes equal to a or the magnitude of the single-phase alternating current ib. As a result, the first stirrer tube 14 and the introduction tube 16 are uniformly heated.

Similarly, a power supply 32C is electrically connected to the power supply terminals 30C and 30E, and the heating single-phase AC current ic supplied from the power supply 32C is set to have the same size as the single-phase AC current ib. (| Ic | = | ib |). Further, since the phase difference between the single-phase alternating current ic and the single-phase alternating current ib is set to 60 °, the magnitude of the combined current of the single-phase alternating current ic and the single-phase alternating current ib is the single-phase alternating current. ic
Or becomes equal to the magnitude of the single-phase alternating current ib. Therefore, the introduction pipe 16 and the riser cell 18 are uniformly heated.

Further, a power source 32D is electrically connected to the power supply terminals 30F and 30J, and the heating single-phase alternating current id is set to have the same magnitude as the single-phase alternating current ic. (| Id | = | ic |). Therefore, the riser cell 18 and the bypass pipe 34 are uniformly heated. Thereby, the first stirrer tube 14 and the introduction tube 1
6. The riser cell 18 and the bypass tube 34 are heated uniformly. The arrows indicated by G in FIGS. 2 and 3 indicate the flow direction of the molten glass.

[0008]

However, in the conventional heating method, the introduction pipe (first conductive pipe) 16 and the riser cell 1 are used.
In the case where the conduit is branched in four directions, such as the connecting portion of the lower end portion 8 (second conductive tube), the upper end portion of the ascending tube cell 18 (third conductive tube) and the bypass pipe (fourth conductive tube) 34. If an electric current for heating is supplied to the entire area of each conduit, three electric currents are combined at the connecting portion of each conduit, which may result in overheating.

Therefore, as shown in FIG.
It is necessary to provide A. When the non-heated portion 34A is provided in this manner, there is a problem that when the molten glass G flows through the non-heated portion 34A, the temperature of the molten glass G lowers and bubbles are generated in the molten glass G. Further, since the temperature of the non-heated portion 34A becomes lower than the temperature of the heated conduit, there is a problem that a temperature difference occurs between the non-heated portion and the heated portion, and the conduit is cracked.

The present invention has been made in view of such circumstances, and heating of a four-way conductive tube which can prevent bubbles from being generated in the molten glass G and cracks in the conduit. The purpose is to provide a method.

[0011]

In order to achieve the above-mentioned object, the present invention provides a single-phase alternating current of a three-phase alternating current over the entire area of a multi-directional conductive tube which branches a flow path of a high temperature molten material in four or more directions. It is characterized in that the respective single-phase alternating currents, which are respectively supplied and become a combined current among the single-phase alternating currents, are set to a phase difference of 60 ° to make the current density in the entire area of the multi-directional conductive tube uniform. .

Further, in order to achieve the above-mentioned object, the present invention forms the multi-directional conductive pipe by first, second, third and fourth conductive pipes, and arranges the first and second conductive pipes adjacent to each other. A single single-phase alternating current is supplied, and a second single-phase alternating current having a phase difference of 60 ° from the first single-phase alternating current is supplied to the adjacent second and third conductive tubes. Second single-phase alternating current and 6 in the conductive tube
It is characterized in that a third single-phase alternating current having a phase difference of 0 ° is supplied.

According to the present invention, the single-phase alternating currents of the three-phase alternating currents are respectively supplied to the entire area of the four-way conductive tube, and the single-phase alternating currents which are combined currents among these single-phase alternating currents are generated. The phase difference was set to 60 °. That is, the adjacent first,
The first single-phase alternating current is supplied to the second conductive tube, and the second single-phase alternating current having a phase difference of 60 ° from the first single-phase alternating current is supplied to the adjacent second and third conductive tubes. A third single-phase alternating current having a phase difference of 60 ° from the second single-phase alternating current was supplied to the third and fourth conductive tubes.

Thus, the current density in the entire area of the four-way conductive tube can be made uniform, so that the entire area of the four-way conductive tube is heated uniformly.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for heating a four-way conductive tube according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an explanatory view explaining a heating method of a four-way conductive tube according to the present invention. It should be noted that, in FIG. 1, the same members as those of the conventional technique shown in FIG.

As shown in FIG. 1, the first stirrer tube 14 is provided.
Power supply terminals 30A and 30B at the upper and lower ends of the
Is provided, and the power supply 32A is electrically connected to the power supply terminals 30A and 30B. Further, a power supply terminal 30C is provided at the lower end portion (second conductive tube) of the rising tube cell 18, and a power supply 32B is electrically connected to the power supply terminals 30B and 30C.

Further, a power supply terminal 30E is provided at the upper end (fourth conductive tube) of the riser cell 18 and a power supply terminal 30F is provided at the left end of the bypass tube (third conductive tube) 34, and the power supply terminal 30E, A power source 32C is electrically connected to 30F. In addition, the power supply terminal 30J is provided at the lower end of the conduit 35 connected to the right end of the bypass pipe (third conductive pipe) 34.
Is provided, and the power supply 32D is electrically connected to the power supply terminal 30J and the power supply terminal 30C.

The arrow indicated by G in FIG. 1 indicates the flow direction of the molten glass. The operation of the heating device for a four-way conductive tube embodying the method for heating a four-way conductive tube according to the present invention having the above-described structure will be described. A single-phase alternating current ib, a single-phase alternating current ic, and a single-phase alternating current id are supplied from the power source 32B, the power source 32C, and the power source 32D, respectively. In this case, the single-phase AC current ib, the single-phase AC current ic, and the single-phase AC current id are set to have the same magnitude (| ib |
= | Ic | = | id |), the phase difference between the single-phase alternating current ib and the single-phase alternating current id is set to 60 °. Therefore, the combined current (ib + id) of the single-phase alternating current ib and the single-phase alternating current id is equal in magnitude to the single-phase alternating current ib and the single-phase alternating current id. Therefore, the lower end portion (second conductive tube) of the rising tube cell 18 is uniformly heated with the introduction tube 16 (first conductive tube) and the bypass tube 34 (third conductive tube).

The single-phase alternating current id and the single-phase alternating current i
The phase difference from c is set to 60 °. Therefore, the combined current (id + i) of the single-phase alternating current id and the single-phase alternating current ic
In c), the magnitude is the single-phase alternating current id or the single-phase alternating current ic.
Is equal to Therefore, the bypass pipe 34 (third conductive pipe) and the upper end portion (fourth conductive pipe) of the riser cell 18 are uniformly heated.

As a result, the introduction pipe (first conductive pipe) 16,
The lower end of the riser cell 18 (second conductive pipe), the riser cell 1
Since the upper end portion (third conductive tube) of 8 and the bypass tube (fourth conductive tube) 34 are uniformly heated, even when each conductive tube is branched in four directions like a four-way conductive tube, It is possible to uniformly heat the entire area of the four-way conductive tube by eliminating the non-heated portion 34A conventionally required.

In the above embodiment, the case where the four-way conductive tube is made of a platinum member has been described, but the present invention is not limited to this.
The method for heating a four-way conductive tube according to the present invention can also be applied to the case of uniformly heating a conductive tube made of a noble metal other than platinum (metal heating tube, non-metal heating tube, etc.).
Further, in the above-mentioned embodiment, the case where the conductive tube forming the flow path of the molten glass G is uniformly heated has been described. However, the present invention is not limited to this, and heating of non-metals, fluids, etc., plate members other than the conductive tube, etc. It can also be applied to the case of branching in four directions.

Further, as in the above embodiment, by keeping the phase difference between the adjacent currents at 60 °, it is possible to heat not only the four-way conductive tube but also the multi-way conductive tube such as the five-way conductive tube and the six-way conductive tube. Is.

[0023]

As described above, according to the method for heating a four-way conductive tube of the present invention, a single-phase alternating current of a three-phase alternating current is supplied to the entire area of the four-way conductive tube, and these single-phase alternating currents are supplied. Mutual single-phase alternating current, which is a combined current in the alternating current, is 60
The phase difference was set to °. That is, the adjacent first and second
The first single-phase alternating current is supplied to the conductive tube, and the second single-phase alternating current having a phase difference of 60 ° from the first single-phase alternating current is supplied to the adjacent second and third conductive tubes. A third single-phase alternating current having a phase difference of 60 ° from the second single-phase alternating current was supplied to the third and fourth conductive tubes.

As a result, the current density in the entire area of the four-way conductive tube can be made uniform, so that the entire area of the four-way conductive tube is heated uniformly. Therefore, it is possible to prevent bubbles from being generated in the molten glass G and prevent cracks from being generated in the conduit.

[Brief description of drawings]

FIG. 1 is an explanatory view explaining a heating method of a four-way conductive tube according to the present invention.

FIG. 2 is an explanatory diagram explaining the operation of the vacuum degassing apparatus.

FIG. 3 is an explanatory diagram illustrating a conventional method for heating a conduit.

FIG. 4 is a vector diagram showing the relationship between the phase difference and the magnitude of the current supplied to the conduit.

[Explanation of symbols]

 16 ... Introducing tube (first conductive tube) 18 ... Ascending tube cell (second conductive tube, fourth conductive tube) 34 ... Bypass tube (third conductive tube) ib, ic, id ... Single-phase alternating current

Claims (2)

[Claims] 1. A single-phase alternating current of a three-phase alternating current is supplied to the entire area of a multi-directional conductive tube that branches a flow path of the high-temperature molten material in four or more directions, and becomes a combined current in the single-phase alternating current. A method for heating a multi-directional conductive tube, wherein mutual phase alternating currents are set to a phase difference of 60 ° to make the current density of the entire multi-directional conductive tube uniform. 2. The multi-directional conductive tube is formed of first, second, third and fourth conductive tubes, and the first and second conductive tubes adjacent to each other are firstly formed.
Single-phase alternating current is supplied, and 60 ° with the first single-phase alternating current to the adjacent second and third conductive tubes.
The second single-phase AC current having a phase difference of 60 ° is supplied to the adjacent third and fourth conductive tubes.
The method for heating a multi-directional conductive tube according to claim 1, wherein a third single-phase alternating current having a phase difference of 1 is supplied.