CN109553276B - Platinum channel electric heating device and method - Google Patents
Platinum channel electric heating device and method Download PDFInfo
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- CN109553276B CN109553276B CN201710884481.0A CN201710884481A CN109553276B CN 109553276 B CN109553276 B CN 109553276B CN 201710884481 A CN201710884481 A CN 201710884481A CN 109553276 B CN109553276 B CN 109553276B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
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Abstract
The utility model relates to a platinum passageway electrical heating equipment and method, this equipment include be used for circulating platinum pipe (1) of glass liquid, locate first ring electrode (7) and second ring electrode (8) at the relative both ends of platinum pipe (1) cover, first ring electrode (7) periphery interval is provided with a plurality of first binding post, the periphery interval of second ring electrode (8) is provided with a plurality of second binding post, first binding post is connected with the second binding post electricity through first ring electrode (7), platinum pipe (1), second ring electrode (8). The equipment and the method disclosed by the invention can reduce the temperature difference of the glass liquid on the same section of the platinum pipe, improve the uniformity and the optical quality of the glass product and meet the requirements of the market on the glass product.
Description
Technical Field
The disclosure relates to the technical field of glass preparation, in particular to platinum channel electric heating equipment and a method.
Background
In the manufacturing process of TFT, LTPS substrate glass and optical glass, a kiln process melts batch into molten glass, the molten glass is subjected to a platinum channel process for clarification and homogenization, the molten glass is subjected to the platinum channel process and then is sent to a forming process to be made into a substrate glass plate semi-finished product, the semi-finished product is processed into a finished product, and then the finished product is packaged and transported to a panel manufacturer for use.
As the substrate glass and the optical glass are increasingly demanded in the technical progress and the market, the demand for the improvement of the quality of the glass and the market expectation are pushed in turn, which demand for the optical quality of the substrate glass and the optical glass is increasingly high.
Disclosure of Invention
The device and the method can reduce the temperature difference of glass liquid on the same section of a platinum pipe, improve the uniformity and optical quality of a glass product and meet the requirements of the market on the glass product.
In order to achieve the above object, the present disclosure provides a platinum channel electric heating apparatus, which includes a platinum pipe for circulating glass liquid, a first ring electrode and a second ring electrode sleeved at two opposite ends of the platinum pipe, wherein a plurality of first connection terminals are arranged at intervals on the periphery of the first ring electrode, a plurality of second connection terminals are arranged at intervals on the periphery of the second ring electrode, and the first connection terminals are electrically connected with the second connection terminals through the first ring electrode, the platinum pipe and the second ring electrode.
The present disclosure also provides a platinum channel electrical heating method, including: the molten glass is introduced into a platinum pipe of the platinum channel electric heating device provided by the disclosure for heating.
According to the platinum channel electric heating equipment and the platinum channel electric heating method, the plurality of wiring terminals are arranged on the annular electrode, the current passing through the platinum tube is more uniform by adjusting the current proportion of different wiring terminals, the temperature difference on the cross section of the platinum tube is reduced, the nonuniformity of a glass product is reduced, the optical quality of the glass product is improved, and the requirement of the market on the glass product is met.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic structural view (side view) of an embodiment of a conventional platinum channel electric heating apparatus.
Fig. 2 is a schematic structural view (cross-sectional view) of an embodiment of a conventional platinum channel electric heating device.
Fig. 3 is a schematic structural view (side view) of one embodiment of the platinum channel electric heating apparatus of the present disclosure.
FIG. 4 is a schematic structural view (cross-sectional view) of one embodiment of the platinum channel electric heating apparatus of the present disclosure.
Description of the reference numerals
1 platinum tube 2 ring electrode 3 ring electrode
4 wiring terminal with inner conducting ring 5 and outer conducting ring 6
7 first ring electrode 7-1 first connection terminal 7-2 first connection terminal
7-3 first connection terminal 8 second ring electrode
T1 first thermocouple T2 second thermocouple T3 third thermocouple
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the manufacture of substrate glass and optical glass, in the process of flowing glass liquid through a platinum channel platinum tube, current is applied to two ends of the platinum channel platinum tube through electrodes, so that the temperature of the platinum tube is increased, and the glass liquid flowing through the platinum channel platinum tube is heated and homogenized. The inventors of the present disclosure have found that glass optical properties, such as refractive index or transmittance non-uniformity of the resulting finished glass, are affected by temperature non-uniformity of the glass melt during the homogenization stage. The specific reason is as follows: in the existing platinum channel electric heating mode, due to the physical characteristics of current, the distribution of the current on a platinum tube cannot reach an even degree, so that the platinum tube cannot uniformly generate heat, the temperature of glass liquid flowing through the platinum tube is different at different parts of the platinum tube, the temperature difference between the upper part and the lower part of the glass liquid can reach more than 50 ℃ on the section of the same platinum tube, and the temperature difference between the middle part and the upper part can also reach more than 30 ℃, so that the optical quality of a produced glass product cannot be further improved.
In order to solve the above problem, as shown in fig. 1, the present disclosure provides a platinum channel electric heating apparatus, which includes a platinum tube 1 for flowing glass liquid, a first ring electrode 7 and a second ring electrode 8 sleeved at two opposite ends of the platinum tube 1, wherein a plurality of first connection terminals are arranged at intervals on the periphery of the first ring electrode 7, a plurality of second connection terminals are arranged at intervals on the periphery of the second ring electrode 8, and the first connection terminals are electrically connected to the second connection terminals through the first ring electrode 7, the platinum tube 1 and the second ring electrode 8. The utility model provides a platinum passageway electrical heating equipment can be through the proportion of the different binding post electric currents of control flow through for the electric current through the platinum pipe is more even, and the temperature difference reduces on the platinum pipe cross-section, has reduced the inhomogeneity of glass product, has improved the optical quality of glass product, reaches the requirement of market to the glass product.
According to the present disclosure, the first connection terminal may be provided in three or more, and the second connection terminal may be provided in three or more. The more the number of the connection terminals is, the better the temperature control effect is, but the equipment cost is increased, as shown in fig. 4, the preferred arrangement of the present disclosure is that three first connection terminals are arranged, and the first connection terminals are distributed in a regular triangle, that is, an angle formed by connection lines at the centers of adjacent connection terminals is 60 °, and preferably one of the first connection terminals is arranged at the top end of the first ring electrode 7; the number of the second connecting terminals is three, and the second connecting terminals are distributed in a regular triangle shape, and preferably one of the second connecting terminals is arranged at the top end of the second annular electrode 8, so that the upper, middle and lower parts of the platinum tube can control the temperature. In addition, the corresponding staggered angle between the corresponding first connecting terminal and the corresponding second connecting terminal (the included angle formed by the connecting line between the center of the first connecting terminal and the center of the first annular electrode and the connecting line between the center of the second connecting terminal and the center of the second annular electrode) can be 0-60 degrees.
According to the disclosure, the first ring electrode 7 and the second ring electrode 8 may be respectively provided with an inner conductive ring 4 and an outer conductive ring 5, the inner conductive ring 4 is sleeved on the platinum pipe, the outer conductive ring is sleeved on the inner conductive ring 5, and the inner conductive ring 4 is in contact with the outer conductive ring 5. The two layers of conducting rings are arranged, so that current distribution is more uniform, the contact resistance of the contact surface is improved, current is redistributed, and in addition, because the temperature of the inner layer conducting ring is higher, the temperature of the outer layer conducting ring is low, the outer layer conducting ring can be made of cheaper materials, so that the cost is reduced.
The materials of the apparatus of the present disclosure are well known to those skilled in the art in light of the present disclosure, for example, the material of the platinum tube 1 may be platinum or platinum alloy, the material of the inner conductive ring 4 may be platinum or platinum alloy, the material of the outer conductive ring 5 may be platinum, platinum alloy, palladium or nickel, and the platinum alloy may be platinum-rhodium alloy. Other materials may be used by those skilled in the art and will not be described in detail in this disclosure.
In order to measure the temperature of the body of the platinum pipe at different positions conveniently and adjust the current proportion flowing through different connecting terminals, a plurality of thermocouples can be arranged on the periphery of the platinum pipe 1 along the height direction, one thermocouple can be arranged at each of the top and the bottom of the platinum pipe, and one or more thermocouples can be arranged at other positions as required. In one embodiment, as shown in fig. 3 to 4, a first thermocouple T1 is disposed at the top of the outer periphery of the platinum pipe 1, a second thermocouple T2 is disposed at the middle of the outer periphery of the platinum pipe 1, a third thermocouple T3 is disposed at the bottom of the outer periphery of the platinum pipe, and the contact end points of the first thermocouple T1, the second thermocouple T2 and the third thermocouple T3 with the platinum pipe 1 are on the same vertical plane.
The present disclosure also provides a platinum channel electrical heating method, including: the molten glass is introduced into a platinum tube 1 of a platinum channel electric heating device provided by the present disclosure to be heated.
In one embodiment, the difference between the temperature of the vertex and the temperature of the midpoint on the same vertical section of the outer periphery of the platinum tube 1 may be controlled to be not more than 10 ℃, preferably not more than 5 ℃ and the difference between the temperature of the midpoint and the temperature of the bottom point may be controlled to be not more than 20 ℃, preferably not more than 15 ℃ by controlling the ratio of the current flowing through the plurality of first connection terminals and the ratio of the current flowing through the plurality of second connection terminals. The specific current control mode takes three first connection terminals as the current input terminals, as shown in fig. 4, the current flowing through the first connection terminal 7-2 and the first connection terminal 7-3 on the lower side is regulated by the input current to account for 30% to 80%, preferably 50% to 70%, of the total current, and the current flowing through the first connection terminal 7-2 is within 10% of the current flowing through the first connection terminal 7-3.
The platinum channel electrical heating apparatus and method of the present disclosure are further described in detail with reference to the embodiments described in the drawings, but the present disclosure is not limited thereto.
Fig. 1-2 are schematic diagrams of platinum channel electrical heating apparatus. As shown in FIG. 1, the apparatus comprises a platinum tube 1, a ring electrode 2 and a ring electrode 3, wherein the ring electrode 2 and the ring electrode 3 are the same, and a first thermocouple T1, a second thermocouple T2 and a third thermocouple T3 are three temperature monitoring points at the middle lower part of the section of the platinum tube 1, and arrows indicate the flowing direction of molten glass. As shown in fig. 2, the ring electrode 2 is composed of a connection terminal 6, an outer conductive ring 5 and an inner conductive ring 4, wherein the outer conductive ring 5 and the inner conductive ring 4 are welded together. The inner part of the inner layer conducting ring 4 is welded with the platinum pipe 1, and the ring electrode 2 and the ring electrode 3 are connected with an external power supply through leads.
The existing platinum channel electric heating equipment has the disadvantages that after the annular electrode 2 and the annular electrode 3 are connected with an external power supply, current passes through the platinum pipe 1, due to the physical characteristics of the current, the current forms a loop along the upper part of the platinum pipe 1, the current density of the middle part and the lower part of the platinum pipe 1 is smaller than that of the upper part, and thus a large temperature difference is formed between the middle part and the lower part of the cross section of the platinum pipe 1, in the actual production, the temperature difference between the upper part and the middle part of the cross section of the platinum pipe 1 (T1-T2) reaches more than 30 ℃, the temperature difference between the lower part and the upper part (T2-T3) reaches more than 50 ℃ and even higher, the uniformity of glass liquid in the homogenizing process is limited, the further improvement of the optical quality of glass is also limited, and the market demand cannot be better met.
Fig. 3-4 are schematic structural diagrams of a specific embodiment of the platinum channel electric heating apparatus of the present disclosure, and as shown in fig. 3, the platinum channel electric heating apparatus of the present disclosure includes, in addition to a conventional platinum pipe 1, a first thermocouple T1, a second thermocouple T2, and a third thermocouple T3 as temperature monitoring points, a first ring electrode 7 and a second ring electrode 8, and the number of connection terminals on the first ring electrode 7 and the second ring electrode 8 is 3, which is different from the structure of the existing apparatus.
The first ring electrode 7 and the second ring electrode 8 are connected with an external power supply, the input currents of the first connecting terminal 7-1, the first connecting terminal 7-2 and the first connecting terminal 7-3 of the first ring electrode 7 can be adjusted according to percentage, the currents passing through the 3 second connecting terminals corresponding to the second ring electrode 8 in a matching mode can also be adjusted according to percentage, the condition that the heating temperature is uneven due to excessive current flowing from the upper portion of the platinum tube 1 is avoided, and therefore the temperature difference values detected by the first thermocouple T1, the second thermocouple T2 and the third thermocouple T3 of the middle and lower three temperature monitoring points on the section of the platinum tube 1 are adjusted, the heating of the platinum tube 1 and the heating of glass liquid flowing through the platinum tube 1 are completed, the temperature difference of the glass liquid at the middle and lower portions on the section of the platinum tube 1 is reduced, and the uniformity of the glass liquid is improved, the optical quality of the glass product is improved, and the requirement of the market on the glass quality is met.
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.
The method for testing the light stripe detection qualification rate in the embodiment comprises the following steps: xenon light penetrates through the glass, the stripe grade condition on the glass plate is observed, the grade 4 is a waste product, and the grades 1, 2 and 3 are qualified products.
Example 1
In this example, the glass melt was electrically heated by using the platinum channel electric heating apparatus shown in FIGS. 3 to 4. The first connecting terminal 7-1, the first connecting terminal 7-2, the first connecting terminal 7-3 and the three second connecting terminals (not shown) are made of copper, the inner conductive ring 4 is made of platinum-rhodium 20 alloy, and the outer conductive ring 5 is made of nickel. The current is applied to the first ring electrode 7 and the second ring electrode 8, the current ratio flowing through the first connecting terminal 7-1 is 30%, the current ratio flowing through the first connecting terminal 7-2 and the first connecting terminal 7-3 is 35%, the corresponding included angle of the connecting terminals matched with the first ring electrode 7 and the second ring electrode 8 is 0 ° (i.e. the connecting terminals are overlapped along the axial direction), after the temperature of the platinum tube is increased to 1500 ℃, the temperature difference between the first thermocouple T1 and the second thermocouple T2 is between 6 and 10 ℃, and the temperature difference between the second thermocouple T2 and the third thermocouple T3 is between 10 and 18 ℃, so that the temperature uniformity of the molten glass in the platinum tube is well improved, and the qualified rate of the prepared glass product light stripe detection is shown in Table 1.
Example 2
The same as example 1 except that: the light stripe detection qualification rate parameters of the prepared glass products are shown in table 1 by controlling the current ratio flowing through different first connecting terminals, controlling the temperature difference between the first thermocouple T1 and the second thermocouple T2 to be between 2 and 5 ℃, and the temperature difference between the second thermocouple T2 and the third thermocouple T3 to be between 6 and 11 ℃.
Comparative example
This comparative example electrically heated the molten glass using the platinum channel electric heating apparatus shown in FIGS. 1-2. The connecting terminal 6 is made of copper, the inner-layer conductive ring 4 is made of platinum-rhodium 20 alloy, and the outer-layer conductive ring 5 is made of nickel. After applying a current to the electrodes 7 and 8 and the temperature of the platinum tube increased to 1500 ℃, the temperature difference between the first thermocouple T1 and the second thermocouple T2 was between 50 and 60 ℃ and the temperature difference between the second thermocouple T2 and the third thermocouple T3 was between 25 and 40 ℃. The qualified rate parameters of the prepared glass product light stripe detection are shown in table 1.
TABLE 1
| Examples | The qualification rate of the light stripe detection% |
| Example 1 | 100 percent of pass rate, more than 90 percent of first grade |
| Example 2 | 100 percent of pass rate, more than 98 percent of first grade |
| Comparative example 1 | 95 percent of pass rate, more than one grade and 80 percent |
As can be seen from Table 1, the apparatus and method of the present disclosure can reduce the temperature difference of the glass liquid on the same cross section of the platinum tube, improve the uniformity and optical quality of the glass product, and meet the requirements of the market for the glass product.
Although specific embodiments have been described and illustrated herein, it is to be understood that the specific embodiments of the present disclosure are for purposes of further explaining the intent and content of the disclosure, and are not to be construed as limiting the disclosure, since certain modifications may be made to the disclosure without departing from the spirit and intent of the disclosure and the scope of the appended claims.
Claims (8)
1. The utility model provides a platinum passageway electrical heating equipment, this equipment is including platinum pipe (1) that is used for circulating glass liquid, first ring electrode (7) and second ring electrode (8) of platinum pipe (1) relative both ends are located to the cover, first ring electrode (7) periphery interval is provided with a plurality of first binding post, the periphery interval of second ring electrode (8) is provided with a plurality of second binding post, first binding post is connected with second binding post electricity through first ring electrode (7), platinum pipe (1), second ring electrode (8), wherein, first binding post sets up to more than three, second binding post sets up to more than three, flows through first binding post with second binding post's current proportion is adjustable.
2. The device according to claim 1, wherein the first terminals are arranged in three and distributed in a regular triangle, wherein one first terminal is arranged at the top end of the first ring electrode (7); the number of the second wiring terminals is three, the second wiring terminals are distributed in a regular triangle, and one of the second wiring terminals is arranged at the top end of the second annular electrode (8).
3. Apparatus according to claim 1, wherein the first and second ring electrodes (7, 8) are each provided with an inner conductive ring (4) and an outer conductive ring (5).
4. The apparatus according to claim 3, wherein the platinum tube (1) is made of platinum or a platinum alloy, the inner conductive ring (4) is made of platinum or a platinum alloy, and the outer conductive ring (5) is made of platinum, a platinum alloy, palladium or nickel.
5. The apparatus according to claim 1, wherein the platinum pipe (1) is provided at its outer circumference with a plurality of thermocouples in a height direction.
6. The apparatus of claim 5, wherein the platinum pipe (1) is provided at the top of the outer circumference with a first thermocouple (T1), at the middle with a second thermocouple (T2), and at the bottom with a third thermocouple (T3), and the first thermocouple (T1), the second thermocouple (T2), and the third thermocouple (T3) are on the same vertical plane as the end points of the platinum pipe (1) where they contact.
7. A method of electrically heating a platinum channel, the method comprising: introducing molten glass into a platinum tube (1) of the platinum channel electric heating equipment as set forth in any one of claims 1 to 6 for heating, and controlling the ratio of the currents flowing through the plurality of first connection terminals and the ratio of the currents flowing through the plurality of second connection terminals so that the difference between the temperature of the vertex and the temperature of the midpoint on the same vertical section of the periphery of the platinum tube (1) is controlled not to exceed 10 ℃ and the difference between the temperature of the midpoint and the temperature of the bottom point is controlled not to exceed 20 ℃.
8. The method of claim 7, wherein the temperature of the apex and the temperature of the midpoint are controlled to differ by no more than 5 ℃ and the temperature of the midpoint and the temperature of the nadir are controlled to differ by no more than 15 ℃.
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| CN201710884481.0A CN109553276B (en) | 2017-09-26 | 2017-09-26 | Platinum channel electric heating device and method |
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| TW572858B (en) * | 2001-02-15 | 2004-01-21 | Nitto Boseki Co Ltd | Bushing temperature controller |
| WO2003062727A1 (en) * | 2002-01-24 | 2003-07-31 | Heraeus Tenevo Ag | Resistance furnace |
| CN201660544U (en) * | 2010-04-22 | 2010-12-01 | 河北东旭投资集团有限公司 | Electric heating structure of platinum channel |
| CN102583955A (en) * | 2012-01-19 | 2012-07-18 | 河南国控宇飞电子玻璃有限公司 | Direct electric-heating flange used for platinum channel |
| JP5731438B2 (en) * | 2012-04-06 | 2015-06-10 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass plate manufacturing method and manufacturing apparatus |
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Effective date of registration: 20240523 Address after: 276005, 1st Floor, Chengkai Building, Liuqing Street, Lanshan District, Linyi City, Shandong Province Patentee after: Shandong Yikang Material Technology Co.,Ltd. Country or region after: China Patentee after: Dongxu Pharmaceutical Glass (Beijing) Technology Co.,Ltd. Patentee after: Gansu Xukang Material Technology Co.,Ltd. Patentee after: DONGXU OPTOELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 050035 No. 9, the Yellow River Avenue, hi tech Zone, Hebei, Shijiazhuang Patentee before: DONGXU OPTOELECTRONIC TECHNOLOGY Co.,Ltd. Country or region before: China |