Device for preventing high-temperature volatilization of pool bottom thermocouple of substrate glass furnace

Abstract

To solve a high-temperature oxidation and volatilization problem of a pool bottom thermocouple.SOLUTION: A device for preventing high-temperature volatilization of a pool bottom thermocouple of a substrate glass furnace comprises a waterproof junction box, a metal connecting pipe, a precious-metal protective sleeve, a thermocouple core and a corundum protection pipe. An insulating material is provided between the metal connecting pipe and the precious-metal protective sleeve. A high-purity aluminum oxide slurry is filled between the precious-metal protective sleeve and the thermocouple core in a sealing manner. The insulating material is made of high-purity aluminum oxide. In the present application, by respectively arranging the insulating material and the high-purity aluminum oxide slurry at two ends of the thermocouple core, high-temperature oxygen can be prevented from entering and causing oxidation and volatilization of a wire and the sleeve, the oxidation and volatilization that would otherwise affect the measurement precision of a thermocouple wire. The furnace thus can continuously, efficiently and stably operate for a long time during a five-year operation cycle, and a direction and a basis are provided for the optimization and adjustment of the process.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention belongs to the technical field of temperature measurement by a thermocouple at the pool bottom of a high-generation substrate glass furnace, and specifically relates to an apparatus for preventing high-temperature volatilization in the thermocouple at the pool bottom of a substrate glass furnace.

Background Art

[0002] Glass products are widely applied in the display field, and it is difficult to imagine the development of the display device industry without the support of the glass industry. At present, although other materials can replace glass in some applications, they still cannot completely replace the excellent performance of glass. From the traditional color cathode ray tube industry to the modern flat panel display industry, glass has continued to play an important role in display devices. In fact, glass is the frame and carrier of the entire device and also an optical component. As the upper and lower two substrates of a flat panel display device, a precise micro semiconductor processing process is required. To meet the requirements of a large supply volume, high-speed high-temperature refining, and long-term efficient and stable operation of the substrate glass furnace, the temperature measurement accuracy and long-term stability of the thermocouple at the pool bottom of the furnace become one of the problems to be solved.

[0003] In the manufacturing process of substrate glass, first, the glass batch is stably and smoothly fed into the supply port of the melting furnace through the supply system, melted, clarified, and homogenized in the furnace to provide a homogeneous glass liquid suitable for the next process. The glass liquid melted in the melting furnace is an alkali-free high-aluminum borosilicate glass, and this glass product is mainly substrate glass for flat panel displays.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The bottom thermocouple of the kiln furnace plays a role in measuring the temperature of the glass liquid during the life cycle of the kiln furnace, and is the main means to provide a powerful guideline for the adjustment and monitoring of the process. If the measurement accuracy of the bottom thermocouple of the pool drops significantly or fails, it will bring a fatal blind spot to the process adjustment and optimization of the production line. Therefore, by solving the problem of high-temperature oxidation and volatilization of the bottom thermocouple of the pool, it is possible to realize the long-term high-efficiency and stable operation of the bottom thermocouple of the pool within the 5-year operation cycle of the kiln furnace, and to provide a direction and basis for the optimization adjustment of the process.

Means for Solving the Problem

[0005] In order to achieve the above object, the present invention adopts the following technical means. The present invention includes a waterproof junction box (1), a metal connection pipe (2), a noble metal protection sleeve (3), a thermocouple core (5) and a corundum protection tube (7). An insulating material (6) is provided between the metal connection pipe (2) and the noble metal protection sleeve (3). A gap sealing material (4) formed of high-purity aluminum oxide slurry is hermetically filled between the noble metal protection sleeve (3) and the thermocouple core (5). The insulating material (6) adopts high-purity aluminum oxide. A part of the corundum protection tube (7) is installed in the metal connection pipe (2), and the other part is installed in the noble metal protection sleeve (3). An apparatus for preventing high-temperature volatilization of the bottom thermocouple of a substrate glass kiln furnace is disclosed.

[0006] Furthermore, the purity of the high-purity aluminum oxide used as the insulating material (6) is 99% or more.

[0007] Furthermore, the insulation resistance of the insulating material (6) at room temperature exceeds 10 14 Ω.

[0008] Furthermore, the noble metal protection sleeve (3) adopts PtRh 10 for use.

[0009] Furthermore, the diameter of the noble metal protection sleeve (3) is 12 mm.

[0010] Furthermore, the thermocouple core (5) adopts a Type B thermocouple or a Type R thermocouple. The positive electrode of the Type B thermocouple is PtRh 30 and the negative electrode of the Type B thermocouple is PtRh6. The positive electrode of the Type R thermocouple is PtRh 13 and the negative electrode of the Type R thermocouple is Pt. The wire diameter of the thermocouple core (5) is 0.8 mm.

[0011] Furthermore, the high-purity aluminum oxide slurry contains high-purity aluminum oxide and a rheology agent.

[0012] Furthermore, the purity of the high-purity aluminum oxide in the high-purity aluminum oxide slurry is 99% or more.

[0013] Furthermore, carboxymethyl cellulose is adopted as the rheology agent in the high-purity aluminum oxide slurry.

[0014] Furthermore, the addition amount of the rheology agent is 1.0% - 1.2%, and the sedimentation volume of the suspension in the high-purity aluminum oxide slurry is 9 - 11%.

Advantages of the Invention

[0015] The present invention has the following beneficial effects. The present invention discloses a device for preventing high-temperature volatilization in the pool-bottom thermocouple of a substrate glass furnace, which includes a waterproof connection box, a metal connection pipe, a noble metal protection sleeve, a thermocouple element core, and a corundum protection tube. An insulating material is provided between the metal connection pipe and the noble metal protection sleeve, and a high-purity aluminum oxide slurry is hermetically filled between the noble metal protection sleeve and the thermocouple element core. The insulating material employs high-purity aluminum oxide. A part of the corundum protection tube is installed inside the metal connection pipe, and the other part is installed inside the noble metal protection sleeve. By arranging an insulating material and a high-purity aluminum oxide slurry at both ends of the thermocouple element core respectively, the present invention can avoid the following: that is, the oxidation volatilization of wires and sleeves caused by the intrusion of high-temperature oxygen, which can affect the measurement accuracy of the thermocouple wire. Thereby, during the 5-year operation cycle of the furnace, it is possible to continuously operate with high efficiency and stability for a long time, providing direction and basis for the optimization adjustment of the process.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0017] Hereinafter, the present invention will be described in detail based on specific embodiments. These descriptions are for the purpose of explaining the present invention and do not limit the present invention.

[0018] To make it easier for those skilled in the art to better understand the technical solution of the present invention, hereinafter, with reference to the drawings in the embodiments of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described. It is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor shall also fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects and do not represent a specific order or sequence. When appropriate, these terms can be replaced, and it should be understood that the embodiments of the present invention can be implemented in an order different from the order described or illustrated herein. Also, the terms "comprising" and "having" and their variants are intended to mean non-exclusive inclusion. For example, a process, method, system, product or device including a plurality of steps or elements can include other steps or elements not explicitly listed, or other steps or elements inherent to these processes, methods, products or devices.

[0020] As shown in FIGS. 1 and 2, the device for preventing high-temperature volatilization in the pool-bottom thermocouple of the substrate glass furnace according to the present invention includes a waterproof junction box 1, a metal connection pipe 2, a noble metal protection sleeve 3, a thermocouple core 5, and a corundum protection tube 7. An insulating material 6 is provided between the metal connection pipe 2 and the noble metal protection sleeve 3, and a gap sealing material 4 formed of high-purity aluminum oxide slurry is hermetically filled between the noble metal protection sleeve 3 and the thermocouple core 5. The insulating material 6 is made of high-purity aluminum oxide, and a part of the corundum protection tube 7 is installed in the metal connection pipe 2, and the other part is installed in the noble metal protection sleeve 3.

[0021] Specifically, the waterproof junction box 1 in this embodiment can protect the internal wiring from the intrusion of moisture and prevent electrical accidents such as short circuits and leakage.

[0022] The corundum protection tube 7 is a tubular structure made of corundum material, which has excellent high-temperature resistance, corrosion resistance, and wear resistance, and is widely used in various fields such as high-temperature furnaces, thermocouple protection tubes, and heat exchangers. In this embodiment, the corundum protection tube 7 is used as the protection tube for the thermocouple core 5 in the high-temperature furnace, and can prevent the thermocouple core 5 from being corroded and worn at high temperatures. Due to such excellent high-temperature resistance performance, the corundum protection tube 7 can be used for a long time at a high temperature of up to 1800°C. Furthermore, it has excellent corrosion resistance and can withstand the erosion of various chemical substances.

[0023] Preferably, the purity of the high-purity aluminum oxide used as the insulating material 6 is 99% or more. Note that the high-purity aluminum oxide contains no other impurities, and it is preferable to use a purity of 99.5%. Furthermore, the insulation resistance of the insulating material 6 at room temperature is 10 14 Ω or more.

[0024] Preferably, the noble metal protection sleeve 3 adopts PtRh 10 Furthermore, the diameter of the noble metal protection sleeve 3 is 12 mm. Note that the noble metal protection sleeve 3 is usually a tube made of noble metals such as platinum, gold, silver, and palladium, and has the characteristics of high purity, high density, and high corrosion resistance. These metals have very high chemical stability and can be used in various corrosive environments. In this embodiment, the noble metal protection sleeve 3 is used to protect the thermocouple core 5.

[0025] Preferably, the thermocouple core 5 adopts a B-type thermocouple or an R-type thermocouple. The positive electrode of the B-type thermocouple is PtRh 30 and the negative electrode is PtRh6. The positive electrode of the R-type thermocouple is PtRh 13 and the negative electrode is Pt. The wire diameter of the thermocouple core 5 is 0.8 mm.

[0026] The B-type thermocouple, also known as the B-type thermocouple wire, uses 70% platinum and 30% rhodium as the conductor material. This thermocouple has excellent performance in a very high temperature measurement range from about 800°C to 1800°C. The B-type thermocouple has good physical and chemical properties, excellent thermoelectric potential stability and oxidation resistance at high temperatures, and can be applied to oxidizing and inert atmospheres.

[0027] The R-type thermocouple is also called a single platinum rhodium thermocouple. One of its conductors contains 87% platinum and 13% rhodium, and the other conductor is 100% pure platinum. This thermocouple can be applied to temperatures up to 1600°C and has advantages such as the highest accuracy, the best stability, a wide temperature measurement range, and a long service life. The R-type thermocouple has good physical and chemical properties, excellent thermoelectric potential stability and oxidation resistance at high temperatures, and is suitable for oxidizing and inert atmospheres. However, its thermoelectric potential and thermoelectric power are small, the sensitivity is low, the mechanical strength decreases at high temperatures, it is very sensitive to contamination, and since the noble metal material is expensive, the initial investment is large.

[0028] Those skilled in the art can select an appropriate B-type thermocouple or R-type thermocouple according to actual production needs.

[0029] Preferably, the high-purity aluminum oxide slurry contains high-purity aluminum oxide and a rheology agent. Furthermore, the purity of the high-purity aluminum oxide in the high-purity aluminum oxide slurry is 99% or more. Furthermore, carboxymethyl cellulose is adopted as the rheology agent in the high-purity aluminum oxide slurry. Furthermore, the addition amount of the rheology agent is 1.0 - 1.2%, and the sedimentation volume of the suspension in the high-purity aluminum oxide slurry is 9 - 11%.

[0030] Note that the rheology agent is an additive used to provide pseudoplasticity or thixotropy in paint technology. The rheological properties are determined by the composition and concentration of the components during paint formulation, and the concentration of the rheology agent determines the rheological properties of the paint. Its concentration affects properties such as the viscosity, thixotropy, and fluidity of the paint. As the concentration of the rheology agent increases, the viscosity of the paint usually increases, the fluidity decreases, and the thixotropy is enhanced. Thixotropy refers to the fact that when the paint is subjected to a shear force, its viscosity changes, affecting the flow and deformation characteristics of the paint. Therefore, the concentration of the rheology agent can be used to control the performance of the paint, such as leveling, sag prevention, edge coverage, and coating. Furthermore, the concentration of the rheology agent also affects the drying speed and film-forming process of the paint. If the concentration is too high or too low, it will also affect the drying speed and film-forming process of the paint, and as a result, it may affect the performance and quality of the coating.

[0031] Through numerous experiments, on the premise of ensuring the fluidity, forming speed, and late-stage structural strength of the high-purity aluminum oxide slurry, when the addition amount of the rheology agent is 1.0 - 1.2%, under the condition that the sedimentation volume of the suspension in the high-purity aluminum oxide slurry is 9 - 11%, it was confirmed that the high-purity aluminum oxide slurry has good physical properties.

[0032] Finally, the above embodiments illustrate the technical solutions of the present invention and do not limit its protection scope. Despite the detailed description of the present invention based on the above embodiments, those skilled in the art should understand that various changes, modifications, or equivalent replacements can be made to the specific implementation methods of the present invention after reading this disclosure. All of these changes, modifications, or equivalent replacements are included within the protection scope of the claims of the present invention.

Description of Reference Numerals

[0033] 1 Waterproof Junction Box 2 Metal Connection Pipe 3 Noble Metal Protection Sleeve 4 Gap sealing material 5 Thermocouple core 6 Insulating material 7 Corundum protection tube

Claims

1. The device includes a waterproof junction box (1), a metal connection pipe (2), a precious metal protective sleeve (3), a thermocouple core (5) and a corundum protective tube (7). An insulating material (6) is provided between the metal connection pipe (2) and the precious metal protection sleeve (3), a gap seal material (4) made of high-purity aluminum oxide slurry is sealed and filled between the precious metal protection sleeve (3) and the thermocouple core (5), the insulating material (6) adopts high-purity aluminum oxide, a part of the corundum protection tube (7) is installed in the metal connection pipe (2), and the other part is installed in the precious metal protection sleeve (3).

2. 2. The device for preventing high-temperature volatilization of a pool bottom thermocouple of a substrate glass furnace as claimed in claim 1, wherein the purity of the high-purity aluminum oxide used as the insulating material (6) is 99% or more.

3. The insulation resistance of the insulating material (6) at room temperature is 10 １４ The apparatus for preventing high temperature volatilization of the pool bottom thermocouple of a substrate glass furnace according to claim 1, wherein the temperature exceeds Ω.

4. The precious metal protective sleeve (3) is PtRh １０ The device for preventing high temperature volatilization of the pool bottom thermocouple of the substrate glass furnace as claimed in claim 1 .

5. 2. The device for preventing high temperature volatilization of pool bottom thermocouple of substrate glass furnace as claimed in claim 1, wherein the diameter of said precious metal protective sleeve (3) is 12 mm.

6. The thermocouple core (5) is a B-type thermocouple or an R-type thermocouple, and the positive electrode of the B-type thermocouple is PtRh. ３０ The negative electrode of the B-type thermocouple is PtRh ６ The positive electrode of the R-type thermocouple is PtRh １３ 2. The device for preventing high-temperature volatilization of a pool bottom thermocouple of a substrate glass furnace according to claim 1, wherein the negative electrode of the R-type thermocouple is Pt, and the wire diameter of the thermocouple core (5) is 0.8 mm.

7. 2. The apparatus for preventing high temperature volatilization of a pool bottom thermocouple of a substrate glass furnace as claimed in claim 1, wherein said high purity aluminum oxide slurry comprises high purity aluminum oxide and a rheology agent.

8. 8. The apparatus for preventing high-temperature volatilization of a pool bottom thermocouple of a substrate glass furnace as claimed in claim 7, wherein the purity of the high-purity aluminum oxide in the high-purity aluminum oxide slurry is 99% or more.

9. 8. The apparatus for preventing high temperature volatilization of a pool bottom thermocouple of a substrate glass furnace as claimed in claim 7, wherein carboxymethyl cellulose is adopted as a rheological agent in the high purity aluminum oxide slurry.

10. The device for preventing high temperature volatilization of the pool bottom thermocouple of the substrate glass furnace as claimed in claim 7, wherein the amount of the rheological agent added is 1.0% to 1.2%, and the sedimentation volume of the suspension in the high purity aluminum oxide slurry is 9 to 11%.

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