JP2014088301A - Heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electric power transmission member for transmitting electric power in a heating device, which has a heating body heated by the electric power transmission member, from being blown out by detecting an electric power member being overloaded by acquiring temperature information on the electric power transmission member itself and performing management and, especially, to prevent an electrode itself from being blown out since the electrode which supplies electric power directly to a glass fusing member is loaded larger than the glass fusing member when glass is fused.SOLUTION: There is provided a heating device having a heating body, an electric power transmission member which transmits electric power to the heating body, and a temperature information acquiring mechanism for the transmission member.

Description

The present invention relates to fusing prevention during energization of a power conducting member that supplies power in various heating devices, and in particular, in a device for heating and melting glass, a temperature control mechanism in the glass heating member, and an accident prevention mechanism in the temperature control mechanism It is about.

  In Japanese Patent Application Laid-Open No. 2003-073130, in a glass element molding apparatus, temperature control of molten glass is a very important process for managing the molding amount, quality, and the like of an optical glass element to be molded. It is described that the method of heating by direct energization is a technique that can control the heating target portion with high efficiency and high accuracy.

Japanese Patent Application Laid-Open No. 10-152329 describes that an electrode can be used as a support material for a glass-melting member because an electrode is used for energization in the direct current heating method.

In the glass melting apparatus, controlling the temperature of the molten glass is extremely important particularly in the expression of performance as optical glass and the maintenance of quality.

The temperature of the glass melted member in contact with the molten glass in the glass melting apparatus is controlled by various control methods. Among them, the method of heating by directly energizing the glass melted member makes the arbitrary range of the glass melted member uniform. It can be heated and plays a big role especially in maintaining the quality of the optical glass.

However, when the direct current heating method is adopted, a load is directly applied to the glass melting member unlike the indirect heating method, and thus the temperature control mechanism is required to be safe.

When a high load is applied to the glass melt member in the direct current heating method due to some factor, the melt member portion is in a high temperature state, which may greatly deviate from the glass forming conditions.

In many glass melting apparatuses including the above-described prior art, temperature measurement is performed only for a glass melting member in contact with molten glass, and temperature measurement is not performed for a portion serving as an electrode that is directly energized.

In the above case, when a high load as described above occurs, the electrode connected to the glass melting member may become high temperature before the glass melting member.

In this case, due to the overload generated in the electrode itself, the electrode itself is worn or melted, the glass melt member is deteriorated, or melted.

Moreover, not only glass melting but also when a heating element generates heat by energization, an electrode for supplying power may be melted by overheating itself.

JP 2003-073130 A Japanese Patent Laid-Open No. 10-152329

The present invention has been made in view of the above problems, and in a heating device having a heating element heated by a power transmission member that transmits power, by acquiring and managing temperature information for the power transmission member itself. An object is to detect an overload on the power member in advance and prevent the power transmission member from fusing.

In particular, when melting glass, the load of the electrode itself that directly heats the glass melt member may be larger than that of the glass melt member, avoiding the risk of the electrode itself fusing. It is necessary to do.

The present inventors provide a temperature information acquisition mechanism for the heating element to which power is supplied by the power transmission member, and at the same time, provide a temperature information acquisition mechanism for the power transmission member, thereby preventing the power transmission member itself. The inventors have found that an overload is detected at an early stage, and have completed the present invention.

  More specifically, the present invention provides the following.

(1) heating element,
A heating apparatus comprising: a power transmission member that transmits power to a heating element; and a temperature information acquisition mechanism of the transmission member.

(2) The heating device according to (1), wherein the heating element and the power conducting member are made of the same metal.

(3) The heating element is a glass heating member for melting the glass raw material,
(1) or (2), wherein the power conducting member is an electrode for supplying power to the glass heating member, and the temperature information acquisition mechanism is a thermocouple connected to the electrode. Heating device.

(4) a display unit for displaying the temperature measured by the thermocouple,
(3) The heating device according to any one of (3), further including an alarm device that emits a signal when the measured temperature of the display unit is out of a set range.

(5) a step of melting glass with a glass heating member,
A glass manufacturing method comprising: a step of transmitting power to the glass heating member by a power transmission member; and a temperature information acquisition step of acquiring temperature information of the transmission member.

(6) The glass manufacturing method according to (5), comprising a glass heating member made of the same metal and the power transmission member.

(7) The power transmission member is an electrode for supplying power to the glass heating member,
The glass production method according to (5) or (6), wherein the temperature information acquisition step is performed by a thermocouple.

(8) The glass production according to any one of (5) to (7), further comprising a mechanism that emits a signal when the value of the temperature information acquired by the temperature information acquisition step is outside the set range. Method.

According to the present invention, when the power transmission member itself is subjected to a high load and becomes high temperature due to an unforeseen situation due to an operation error or a machine trouble, the temperature of the power transmission member itself is out of the setting range of the measurement value. By transmitting the signal at the time, an overload on the power transmission member itself can be detected early.

Positional relationship diagram of flow path and thermocouple of the present invention Positional relationship diagram of molten iron and thermocouple of the present invention A control panel that displays the temperature measured by a thermocouple

  Hereinafter, an embodiment of the present invention will be described in detail. However, the present invention is not limited to the following embodiment, and may be implemented with appropriate modifications within the scope of the object of the present invention. it can. In addition, although description may be abbreviate | omitted suitably about the location where description overlaps, the meaning of invention is not limited.

  In optical glass molding, usually, cullet is prepared by mixing and stirring raw materials and performing primary melting. Thereafter, in secondary melting, cullet is put into a glass melted iron, melted into glass, stirred, and molded through a flow path. The glass melt and the channel are heated by indirect heating and direct heating, and the temperature is controlled using values measured by a thermocouple.

Further, in the present specification, the “heating element” refers to a generic name for those that generate heat by applying electricity or magnetism. For example, in glass production, it refers to a glass heating member that generates heat when energized, but also refers to a known heating element such as a heater.

In particular, in the present specification, “a member for heating a glass” is a concept indicating a portion in contact with molten glass. That is, in FIG. 1, the glass melted iron 1 and the flow path 2 are particularly pointed out.

Further, in the present specification, the “power transmission member” refers to a general term for means for transmitting power to the heating element. For example, it refers to a conductor such as an electrode or a cord. That is, in FIG. 1, the electrode 3 is particularly indicated.

FIG. 1 shows the entire glass melting apparatus in which an electrode to be energized and a thermocouple are connected to a glass melting apparatus connected to a molten iron. The glass melting apparatus according to the present invention has a glass melter 1 and a flow channel 2 connected to the glass melting tank 1, and an electrode 3 is welded on the flow channel 2, and on the flow channel and the electrode, Thermocouples 4 and 5 are welded respectively.

  In the present invention, the glass heating member is preferably a member that is stable even at high temperatures during glass melting, and in particular, a material that can be used for known glass melting such as white metal, quartz, gold, platinum group alloy, and reinforced platinum. Can be used.

The material for the glass heating member is preferably the same material from the viewpoint of strength, electrical conductivity, thermal conductivity and the like. In particular, it is desirable that the materials for the glass heating members such as the molten iron and the flow path are the same.

  The power transmission member is also preferably made of the same material as the heating element for the same reason as described above. In particular, the glass heating member and the power transmission member (electrode 3 in FIG. 1) are preferably made of the same material.

  The electrode is provided to energize and heat the glass heating member, and can be welded to an arbitrary position of the glass heating member. For example, it is possible to precisely control the temperature of an arbitrary position by welding a plurality of electrodes on the flow path 2 in FIG. 1 and on the molten iron 7 in FIG.

The temperature information acquisition mechanism indicates a control panel having a display unit for displaying temperature information.

The temperature information acquisition information is measured by, for example, a thermocouple.

The thermocouple in the present invention is provided for measuring the temperature of the electrode itself, in addition to the glass heating member, and in the vicinity of the welded portion between the glass heating member and the electrode, between the plurality of electrodes connected to the glass heating member. In addition to measuring the temperature of the glass heating member itself by providing it at the point, it is also possible to obtain temperature information of the electrode by welding to the electrode itself. Specifically, it is desirable to weld to the side surface and bottom surface of the glass melt, the vicinity of the welded portion of the flow channel and the electrode, the intermediate points of the plurality of electrodes on the flow channel, and the electrode itself.

  The thermocouple welded to the electrode itself can be welded to any point of the electrode, but is not particularly affected by the high temperature glass in the flow path and can measure the average temperature of the electrode itself. Where required, it is desirable to weld to the center of gravity of the electrode.

FIG. 2 is a mode in which the molten iron heating electrode 6 is welded to the glass melt 7, and the temperature of the glass melt 7 is controlled by direct current heating as in the flow path 2 of FIG. 1.
In this case, it is desirable to control the temperature of the glass melt 7 by welding the thermocouple 8 to the melt heating electrode 6.

FIG. 3 shows a temperature control panel 9 for displaying the measured temperature from the thermocouple connected to the glass melting apparatus. For example, in FIG. 1, the temperature control panel 9 includes a display unit for the temperature measured from the thermocouples 4 and 5 and an alarm device 10.

In the temperature display section of the control panel, when the measured temperature is out of the set temperature range due to the temperature of the measurement site, energization output, etc., a signal is transmitted from the temperature control device and an alarm device incorporated in the control panel Operates.

The alarm device refers to a device having a mechanism for transmitting a signal when a temperature value measured by a thermocouple exceeds a set measurement value range. As the generated signal, means such as light and sound can be used.

The temperature measurement range can be arbitrarily set depending on the material of the glass heating member.

For example, in FIG. 1, it is desirable that the measurement temperature of the electrode itself is 500 ° C. lower than the melting point of the material used for the glass heating member.

For example, in FIG. 1, when reinforced platinum is used for the molten iron 1 and the flow path 2 that are glass heating members and the electrode 4 that is a power transmission member, the temperature is 1200 ° C., which is 500 ° C. lower than the melting point of the reinforced platinum. Is set so that the alarm device 10 is activated.

When the alarm device is activated, the power transmission member to be measured is in an overloaded state, and therefore measures to reduce the load are taken as appropriate.
For example, in FIG. 1, the current value applied to the electrode is gradually decreased so that the electrode temperature is decreased in units of several tens of degrees Celsius, and measures are taken to prevent fusing.

  When the alarm device is activated, it is possible to perform temperature control manually, but it is desirable to perform temperature control using an automatic control mechanism.

After the fusing prevention mechanism has been introduced, no overheating has been confirmed even in the same operation, and no fusing has occurred.

DESCRIPTION OF SYMBOLS 1 Glass molten metal 2 Glass flow path 3 Electrode 4 Channel temperature measurement thermocouple 5 Electrode temperature measurement thermocouple 6 Molten metal heating electrode 7 Glass molten metal 8 Electrode temperature measurement thermocouple 9 Temperature control panel 10 Alarm device

Claims (8)

Heating element,
A heating apparatus comprising: a power transmission member that transmits power to a heating element; and a temperature information acquisition mechanism of the transmission member.
The heating device according to claim 1, wherein the heating element and the power conducting member are made of the same metal.
The heating element is a glass heating member for melting glass raw materials,
The heating apparatus according to claim 1 or 2, wherein the power conducting member is an electrode for supplying power to the glass heating member, and the temperature information acquisition mechanism is a thermocouple connected to the electrode. .
A display unit for displaying the temperature measured by the thermocouple;
The heating apparatus according to claim 3, further comprising an alarm device that emits a signal when the measured temperature of the display unit is out of a set range.
A step of melting glass with a glass heating member,
A glass manufacturing method comprising: a step of transmitting power to the glass heating member by a power transmission member; and a temperature information acquisition step of acquiring temperature information of the transmission member.
The glass manufacturing method according to claim 5, comprising a glass heating member made of the same metal and the power transmission member.
The power transmission member is an electrode for supplying power to the glass heating member;
The glass manufacturing method according to claim 5, wherein the temperature information acquisition step is performed by a thermocouple.
Furthermore, it has a mechanism which emits a signal when the value of the temperature information acquired by the said temperature information acquisition process becomes out of a setting range, The glass manufacturing method in any one of Claim 5 to 7 characterized by the above-mentioned.

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