Device for preventing high temperature volatilization at the 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 relates to the technical field of temperature measurement using pool bottom thermocouples in advanced substrate glass furnaces, and more particularly to a device for preventing high-temperature volatilization in pool bottom thermocouples in substrate glass furnaces. [Background technology]

[0002] Glass products are widely used in the display industry, and it is difficult to imagine the development of the display device industry without the support of the glass industry. While other materials can now replace glass in some applications, they still cannot completely replace the excellent performance of glass. From the traditional color CRT industry to the modern flat-panel display industry, glass continues to play an important role in display devices. In fact, glass is the frame and carrier for the entire device, as well as an optical component. The upper and lower substrates of flat-panel display devices require precise micro-semiconductor processing. To meet the requirements of large-volume glass substrate furnaces, high-speed, high-temperature refining, and long-term efficient and stable operation, the temperature measurement accuracy and long-term stability of thermocouples at the bottom of the furnace pool are key challenges.

[0003] In the glass substrate manufacturing process, glass ingredients are first fed stably and smoothly into the inlet of a melting furnace via a supply system, where they are melted, refined, and homogenized to produce a homogeneous glass liquid suitable for the next process. The glass liquid melted in the melting furnace is alkali-free high-aluminum borosilicate glass, and this glass product is mainly used as substrate glass for flat panel displays. Summary of the Invention [Problem to be solved by the invention]

[0004] The kiln pool-bottom thermocouple is responsible for measuring the glass liquid temperature throughout the kiln's life cycle and is the primary means for providing guidance for process adjustment and monitoring. A significant decline in the measurement accuracy of the pool-bottom thermocouple or its failure to function properly can pose a critical blind spot for process adjustment and optimization on the production line. Therefore, resolving the high-temperature oxidation and volatilization problem of the pool-bottom thermocouple can ensure long-term, efficient, and stable operation of the pool-bottom thermocouple within the kiln's five-year operating cycle, providing direction and evidence for process optimization. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention employs the following technical techniques. The present invention discloses a device for preventing high-temperature volatilization of a pool bottom thermocouple in a substrate glass furnace, comprising 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), wherein an insulating material (6) is provided between the metal connection pipe (2) and the precious metal protective sleeve (3), a gap sealant (4) made of high-purity aluminum oxide slurry is hermetically filled between the precious metal protective sleeve (3) and the thermocouple core (5), the insulating material (6) adopts high-purity aluminum oxide, and a portion of the corundum protective tube (7) is installed inside the metal connection pipe (2), and another portion is installed inside the precious metal protective sleeve (3).

[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 is 10 14 Exceeds Ω.

[0008] Furthermore, the precious metal protective sleeve (3) is PtRh 10 will be adopted.

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

[0010] Furthermore, the thermocouple core (5) adopts 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 PtRh6, and the positive electrode of the R-type thermocouple is PtRh 13 The negative electrode of the R-type thermocouple is Pt, and 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 rheological 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 employed as a rheological agent in the high purity aluminum oxide slurry.

[0014] Furthermore, 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%. [Effects of the Invention]

[0015] The present invention has the following beneficial effects. The present invention discloses a device for preventing high-temperature volatilization of the pool-bottom thermocouple in a substrate glass furnace. The device includes a waterproof connection box, a metal connection pipe, a precious metal protective sleeve, a thermocouple element core, and a rigid ball protection tube. An insulating material is provided between the metal connection pipe and the precious metal protective sleeve. A high-purity aluminum oxide slurry is sealed and filled between the precious metal protective sleeve and the thermocouple element core. The insulating material is made of high-purity aluminum oxide, and one portion of the rigid ball protection tube is mounted inside the metal connection pipe, while the other portion is mounted inside the precious metal protective sleeve. By providing the insulating material and high-purity aluminum oxide slurry on both ends of the thermocouple element core, the present invention prevents the intrusion of high-temperature oxygen, which can cause oxidation and volatilization of the wire or sleeve and affect the measurement accuracy of the thermocouple wire. This allows the furnace to continue operating efficiently and stably for a long period of time over a five-year operating cycle, providing direction and basis for process optimization. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic diagram showing the structure of a device for preventing high-temperature volatilization of a thermocouple at the bottom of a pool in a substrate glass furnace according to an embodiment of the present invention; [Figure 2] 1 is a partial method diagram of a metal connection pipe and a precious metal protective sleeve in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described in detail below with reference to specific examples, which are merely illustrative of the present invention and are not intended to limit the present invention.

[0018] In order to facilitate those skilled in the art in understanding the technical solutions of the present invention, the following clearly and completely describes the technical techniques of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. It is clear that the described embodiments are only some embodiments of the present invention, and are not all embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without creative work also fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first," "second," and the like in the present specification and claims, as well as in the drawings, are used to distinguish between similar objects and do not imply a particular order or context. It should be understood that, where appropriate, these terms are interchangeable and that embodiments of the present invention may be performed in an order other than that described or illustrated herein. Furthermore, the terms "comprising" and "having" and variations thereof are intended to be non-exclusive inclusive; for example, a process, method, system, product, or apparatus that includes multiple steps or elements may include other steps or elements not expressly listed or that are inherent to the process, method, product, or apparatus.

[0020] As shown in Figures 1 and 2, the device for preventing high-temperature volatilization of a pool-bottom thermocouple in a substrate glass furnace according to the present invention 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 protective sleeve 3, and a gap sealant 4 made of high-purity aluminum oxide slurry is hermetically filled between the precious metal protective sleeve 3 and the thermocouple core 5. The insulating material 6 is made of high-purity aluminum oxide, and a portion of the corundum protective tube 7 is fitted within the metal connection pipe 2, and the other portion is fitted within the precious metal protective sleeve 3.

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

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

[0023] Preferably, the purity of the high-purity aluminum oxide used as the insulating material 6 is 99% or more. The high-purity aluminum oxide does not contain 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 It is greater than or equal to Ω.

[0024] Preferably, the precious metal protective sleeve 3 is PtRh 10 The noble metal protective sleeve 3 is used. The diameter of the noble metal protective sleeve 3 is 12 mm. The noble metal protective sleeve 3 is usually a tube made of a noble metal such as platinum, gold, silver, or palladium, and is characterized by high purity, high density, and high corrosion resistance. These metals have very high chemical stability and can be used in a variety of corrosive environments. In this embodiment, the noble metal protective sleeve 3 is used to protect the thermocouple core 5.

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

[0026] The Type B thermocouple, also known as Type B thermocouple wire, uses 70% platinum and 30% rhodium as its conductor material. This thermocouple has excellent performance in the very high temperature measurement range of approximately 800°C to 1800°C. Type B thermocouples have good physical and chemical properties, excellent thermoelectric potential stability, and excellent oxidation resistance at high temperatures, making them suitable for use in oxidizing and inert atmospheres.

[0027] The R-type thermocouple, also known as a single platinum-rhodium thermocouple, has one conductor containing 87% platinum and 13% rhodium, while the other is 100% pure platinum. This thermocouple is suitable for temperatures up to 1600°C and offers advantages such as the highest accuracy, best stability, a wide temperature measurement range, and a long service life. R-type thermocouples have excellent physical and chemical properties, excellent thermoelectric potential stability, and high-temperature oxidation resistance, making them suitable for use in oxidizing and inert atmospheres. However, their thermoelectric potential and thermoelectric coefficient are small, their sensitivity is low, their mechanical strength decreases at high temperatures, they are highly susceptible to contamination, and their expensive precious metals require a large initial investment.

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

[0029] Preferably, the high-purity aluminum oxide slurry contains high-purity aluminum oxide and a rheological agent. Furthermore, the purity of the high-purity aluminum oxide in the high-purity aluminum oxide slurry is 99% or more. Furthermore, the high-purity aluminum oxide slurry uses carboxymethyl cellulose as the rheological agent. Furthermore, 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%.

[0030] Rheological agents are additives used in coating technology to provide pseudoplastic or thixotropic properties. Rheological properties are determined by the composition and concentration of the components in a coating formulation, and the concentration of the rheological agent determines the rheological properties of the coating. The concentration affects properties such as viscosity, thixotropy, and flow of the coating. Increasing the concentration of the rheological agent typically increases the viscosity of the coating, decreases its flow, and strengthens its thixotropy. Thixotropy refers to the change in viscosity of a coating when subjected to shear forces, affecting its flow and deformation characteristics. Therefore, the concentration of the rheological agent can be used to control coating performance such as leveling, sagging prevention, edge coverage, and coating. Furthermore, the concentration of the rheological agent also affects the drying speed and film-forming process of the coating. If the concentration is too high or too low, it can affect the drying speed and film-forming process of the coating, ultimately affecting the performance and quality of the coating.

[0031] Through numerous experiments, it was confirmed that, on the premise of ensuring the fluidity, forming speed, and later structural strength of the high-purity aluminum oxide slurry, when the amount of rheology agent added was 1.0 to 1.2%, the high-purity aluminum oxide slurry had good physical properties, provided that the sedimentation volume of the suspension in the high-purity aluminum oxide slurry was 9 to 11%.

[0032] Finally, the above examples are intended to illustrate the technical solutions of the present invention, and do not limit its scope of protection. Although the present invention has been described in detail based on the above examples, 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 in the scope of protection of the claims of the present invention. [Explanation of symbols]

[0033] 1 Waterproof tangent box 2 metal connecting pipes 3 Precious metal protection sleeve 4. Gap sealant 5 thermocouple core 6. Insulating materials 7 Corundum protection tube

Claims

1. It 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 connecting pipe (2) and the precious metal protective sleeve (3), a gap sealant (4) made of high-purity aluminum oxide slurry is sealed and filled between the precious metal protective sleeve (3) and the thermocouple core (5), the insulating material (6) adopts high-purity aluminum oxide, a part of the corundum protective tube (7) is fitted inside the metal connecting pipe (2), and the other part is fitted inside the precious metal protective sleeve (3), and the high-purity aluminum oxide slurry contains high-purity aluminum oxide and a rheological agent.

2. 2. The device for preventing high-temperature volatilization of a pool bottom thermocouple in a substrate glass furnace according to 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 device for preventing high temperature volatilization of a 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 2. The device for preventing high-temperature volatilization of the pool bottom thermocouple of a substrate glass furnace as claimed in claim 1,

5. 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 diameter of the 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 and 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 in a substrate glass furnace according to claim 1, wherein the purity of the high-purity aluminum oxide in the high-purity aluminum oxide slurry is 99% or more.

8. 2. The apparatus for preventing high-temperature volatilization of a pool bottom thermocouple in a substrate glass furnace as claimed in claim 1, wherein carboxymethyl cellulose is used as the rheological agent in the high-purity aluminum oxide slurry.

9. 2. The device for preventing high-temperature volatilization of a pool bottom thermocouple in a substrate glass furnace according to claim 1, 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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