Thermocouple device for measuring glass temperature and method for manufacturing the same

Abstract

The application discloses a thermocouple device for measuring glass liquid temperature and a preparation method of the thermocouple device, which comprises a thermocouple tube, a temperature measuring point is arranged in the thermocouple tube, a thermocouple wire is arranged on the temperature measuring point, a sleeve is arranged on the outer side of the thermocouple wire, and the end of the thermocouple wire penetrates the sleeve and the thermocouple tube in sequence. The original temperature measuring point does not need to be externally provided with a certain thickness of refractory material, the temperature measurement accuracy is improved, the installation position of the thermocouple tube can be adjusted according to the structure of a platinum gold channel for storing glass liquid or temperature measurement requirements, the installation is flexible, multiple positions of the glass liquid can be detected, the accuracy of detection data is ensured, the temperature measuring point is arranged in the interior of the thermocouple tube, the sealing property of the temperature measuring point is ensured, direct contact between the glass liquid and the temperature measuring point is avoided, damage to the temperature measuring point is reduced, and the problem of temperature measurement accuracy reduction after long-time measurement is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of glass manufacturing, and relates to a thermocouple device for measuring the temperature of glass liquid and a preparation method of the thermocouple device. BACKGROUND

[0002] The manufacturing of substrate glass is a high-tech field integrating multiple specialties such as material science, basic mechanics, thermodynamics, electricity, optics and fluid mechanics. The process flow mainly includes melting, refining, homogenizing, cooling, forming and cold finishing. Except for cold finishing, the other processes belong to the hot end, which can be divided into the kiln system and the platinum channel system. First, the raw materials mainly composed of quartz sand and formed according to a certain ratio are melted at high temperature in the kiln system to form glass melt with a certain viscosity, and then flow through the platinum channel system to perform a series of high-temperature processes such as refining, homogenizing and cooling. It is well known that the system process of substrate glass is based on the viscosity-temperature curve characteristics of the material side, and different temperatures, residence times and other factors are set for different links. Therefore, the monitoring and control of temperature are the most important in the whole process of the hot end.

[0003] Currently, thermocouples are used to monitor the temperature in real time. Among these thermocouples, there are mainly two types: insertion type and welded type. These two types of thermocouples have their own advantages and disadvantages. The insertion type thermocouple has high reliability and slow decay rate, and can be installed in the glass liquid. However, since the thermocouple wire is inside the protective sleeve, the temperature measuring point is separated from the middle of the glass liquid by a certain thickness of refractory material, so the detected temperature is much lower than the actual temperature. Especially in the platinum channel area, it is often used as an auxiliary temperature measurement in the process. The welded thermocouple has the advantages of high temperature measurement accuracy and wide distribution. However, due to poor sealing, there are problems of decay and damage. Moreover, the temperature measuring point of the welded thermocouple is on the platinum tube wall. Although the initial temperature is very accurate, it cannot monitor the temperature inside the glass liquid, but only the temperature on the surface of the glass liquid. Therefore, the concept of equivalent difference is often used to make empirical quantification to meet the daily production control needs. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art that the temperature measuring point is separated from the middle of the glass liquid by a certain thickness of refractory material, so the detected temperature is much lower than the actual temperature, and the temperature measuring point of the welded thermocouple is welded on the platinum tube wall, which cannot detect the temperature inside the glass liquid, and the temperature measurement accuracy is low. Moreover, due to poor sealing, there are problems of decay and damage. The present application provides a thermocouple device for measuring the temperature of glass liquid and a preparation method of the thermocouple device.

[0005] To achieve the above object, the present application adopts the following technical solutions to achieve the above object:

[0006] A thermocouple device for measuring glass liquid temperature comprises a thermocouple tube, an inside of the thermocouple tube is provided with a temperature measuring point, the temperature measuring point is provided with a thermocouple wire, and an outside of the thermocouple wire is sleeved with a sleeve.

[0007] Ends of the thermocouple wire penetrate the sleeve and the thermocouple tube away from the end of the temperature measuring point in sequence.

[0008] The present application is further improved in that:

[0009] The temperature measuring point is arranged at a radially symmetrical center of the thermocouple tube.

[0010] A gap in the inside of the thermocouple tube is provided with a filler.

[0011] The filler is alumina fine powder.

[0012] The thermocouple wire is distributed axially along the inside of the thermocouple tube.

[0013] The inside of the thermocouple tube is provided with a thermal couple sheet, and the temperature measuring point is arranged on the thermal couple sheet.

[0014] An end of the sleeve close to the temperature measuring point is 3-5mm away from the temperature measuring point.

[0015] The thermocouple wire comprises two wires, one is a positive electrode, and the other is a negative electrode, and the end parts of the positive electrode and the negative electrode close to the temperature measuring point are connected.

[0016] The sleeve is provided with a positive electrode hole and a negative electrode hole corresponding to the thermocouple wire.

[0017] The diameters of the positive electrode hole and the negative electrode hole are greater than the diameter of the thermocouple wire.

[0018] A preparation method of a thermocouple device for measuring glass liquid temperature comprises the following steps:

[0019] S1: selecting a thermocouple plate, and determining a temperature measuring point on the thermocouple plate;

[0020] S2: coincidentally welding the positive and negative electrodes of the thermocouple wire on the temperature measuring point;

[0021] S3: performing tube forming on the thermocouple plate, forming a thermocouple tube after the tube forming, and welding a longitudinal joint of the thermocouple tube;

[0022] S4: inserting the sleeve into the ends of the thermocouple wire, and sleeving the sleeve on the outside of the thermocouple wire;

[0023] S5: filling the inside of the thermocouple tube with fine powder, and sealing the port of the thermocouple tube after filling the inside of the thermocouple tube with the fine powder.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The thermocouple device for measuring glass liquid temperature is disclosed, which takes the thermocouple tube as a carrier, sets a temperature measuring point in the inside of the thermocouple tube, connects the thermocouple wire on the temperature measuring point, and simultaneously sets a sleeve outside the thermocouple wire to reinforce the stability of the thermocouple wire fixation, one end of the thermocouple wire is connected with the temperature measuring point for temperature measurement, and the other end can be connected with the external terminal after penetrating the sleeve and the thermocouple tube in sequence, which can monitor the measured temperature in real time. The device disclosed in the present application can directly connect the thermocouple tube with the platinum gold channel for storing glass liquid for temperature measurement. The temperature measuring point takes the thermocouple tube as a carrier, and does not need to set a certain thickness of refractory material outside the original temperature measuring point, thereby improving the accuracy of temperature measurement. The installation position of the thermocouple tube can be adjusted according to the structure of the platinum gold channel for storing glass liquid or the temperature measurement requirement, the installation is flexible, the plurality of positions of the glass liquid can be detected, the accuracy of the detection data is ensured, the temperature measuring point is arranged in the inside of the thermocouple tube, the sealing property of the temperature measuring point is ensured, the direct contact between the glass liquid and the temperature measuring point is prevented, the damage to the temperature measuring point is reduced, and the problem of temperature measurement accuracy reduction after long time measurement is avoided.

[0026] Further, in the thermocouple device disclosed in the embodiment of the present application, the temperature measuring point is arranged at the radially symmetrical center point of the thermocouple tube, which can ensure that the temperature measuring point can measure the temperature at the center of the glass liquid according to the installation mode of the thermocouple tube, thereby improving the comprehensiveness and accuracy of temperature measurement.

[0027] Further, in the thermocouple device disclosed in the embodiment of the present application, the internal gap of the thermocouple tube is provided with a filler, which can reinforce the stability of the arrangement of the internal components and prevent the components from being deviated.

[0028] Further, in the thermocouple device disclosed in the embodiment of the present application, the thermocouple wire is distributed along the internal axis of the thermocouple tube, and when one end of the thermocouple wire is bent, the diameter is increased to ensure that there is enough space in the thermocouple tube.

[0029] Further, in the thermocouple device disclosed in the embodiment of the present application, the temperature measuring point is arranged on the thermocouple sheet to avoid the direct contact between the temperature measuring point and the thermocouple tube during processing, thereby avoiding the damage to the thermocouple tube during processing.

[0030] Further, in the thermocouple device disclosed in the embodiment of the present application, the diameters of the positive pole hole and the negative pole hole are greater than the diameter of the thermocouple wire to ensure the smoothness of the sleeve of the sleeve during installation. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as limiting the scope. All other related drawings can be obtained by those skilled in the art without making creative efforts on the premise of not making creative efforts.

[0032] Figure 1 The overall cross-sectional view of the galvanic device of the present application;

[0033] Figure 2 The cross-sectional detail view of the temperature measuring point of the present application;

[0034] Figure 3 The partial detail view of the thermocouple after welding of the present application;

[0035] Figure 4 The overall schematic view of the plate after initial welding of the thermocouple of the present application;

[0036] Figure 5 The cross-sectional view of the thermocouple after forming of the coiled pipe of the present application;

[0037] Figure 6 The schematic view of the use of the circular pipe cross-sectional shape of the present application;

[0038] Figure 7 The schematic view of the use of the flat pipe cross-sectional shape of the present application.

[0039] Wherein: 1-galvanic tube; 2-thermocouple sheet; 3-temperature measuring point; 4-thermocouple wire; 5-sleeve. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts on the premise of not making creative efforts, belong to the scope of protection of the present application.

[0042] It should be noted that: similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0043] In the description of the embodiments of the application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the application is usually placed, only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", etc. are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0044] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0045] In the description of the embodiments of the application, it should be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0046] The application will be further described in detail below with reference to the drawings:

[0047] Referring to Figures 1 to 7 The embodiment of the application discloses a thermocouple device for measuring glass liquid temperature, taking a thermocouple tube as a carrier, setting a temperature measuring point, mainly aiming at the process monitoring of a platinum channel, designing an insertion type welded thermocouple scheme that can directly reach the cross section center of the glass liquid, and can realize high-precision detection of the internal temperature of the glass, provide more reliable temperature measurement value for the process, further improve the precision control of product quality and defect prevention, and realize the measurement of the center temperature of the glass liquid with different cross section shapes.

[0048] Referring to Figures 1-2 The embodiment of the application discloses a thermocouple device for measuring glass liquid temperature, taking a thermocouple tube as a carrier, setting a temperature measuring point, mainly aiming at the process monitoring of a platinum channel, designing an insertion type welded thermocouple scheme that can directly reach the cross section center of the glass liquid, and can realize high-precision detection of the internal temperature of the glass, provide more reliable temperature measurement value for the process, further improve the precision control of product quality and defect prevention, and realize the measurement of the center temperature of the glass liquid with different cross section shapes.

[0049] Further, in the embodiment of the present application, the temperature measuring point 3 is located in the radially symmetrical middle region inside the thermocouple tube 1, and the whole thermocouple is on one side of the wire, and the middle region is the center position of the platinum channel tube body, which can accurately measure the temperature of the center point of the flowing glass liquid.

[0050] Further, in the embodiment of the present application, a thermocouple sheet 2 is arranged inside the thermocouple tube 1, and the temperature measuring point 3 is arranged on the thermocouple sheet 2.

[0051] Further, in the embodiment of the present application, the thermocouple tube 1 is a platinum thermocouple tube, the thermocouple sheet 2 and the temperature measuring point 3 are welded inside the thermocouple tube 1, and the thermocouple wire 4 is welded on the temperature measuring point 3.

[0052] Further, in the embodiment of the present application, the sleeve 5 is an alumina sleeve.

[0053] Further, in the embodiment of the present application, the platinum thermocouple tube and the platinum channel for storing glass liquid are made of the same material, that is, the Rh content is different from 5% to 20%; and the thickness is designed to be 1.0 mm, which can ensure the operation life of more than 4 years. The main consideration is the erosion and scouring effect of high-temperature glass liquid on the surface of platinum. The thickness of 1.0 mm can meet the requirement that the platinum thermocouple tube 1 still has certain strength under the condition of running for 4 years, so as to ensure that the tube body does not deform.

[0054] Further, in the embodiment of the present application, the inner diameter of the platinum thermocouple tube is generally designed to be in the range of 8 mm to 12 mm according to the distance between the thermocouple wires 4 and the diameter of the alumina sleeve, which can meet the needs of installation and the accommodation space of internal thermocouple temperature measuring points and other components.

[0055] Further, in the embodiment of the present application, the length of the platinum thermocouple tube is related to the shape and diameter of the platinum channel tube body at the measurement position. Since the installation mode of the platinum thermocouple tube 1 is generally vertical or horizontal layout, the main consideration is the consistency of the external corresponding refractory structure and the uniformity of the wire lead. Therefore, the length of the platinum thermocouple tube 1 will be different. According to the size of each section of the platinum channel, the length is about 50 mm to 700 mm. The greater the length, the thicker the wall thickness needs to be increased according to the specific length. Generally, when the length is more than 350 mm, the wall thickness of the platinum thermocouple tube 1 will increase to 1.5 mm, so as to ensure the basic structural strength of the tube body.

[0056] The embodiment of the present application discloses a preparation method of a thermocouple device for measuring the temperature of glass liquid.

[0057] Step 1: selecting a thermocouple plate, and determining a temperature measuring point on the thermocouple plate;

[0058] The selected thermocouple plate includes a sheared material of a platinum thermocouple tube:

[0059] For cutting the platinum galvanic tube, select a platinum plate of appropriate material and thickness, and cut it into the rectangular size of the platinum galvanic tube 1 when it is unfolded. That is, the length of the rectangle is the final tube length, and the width of the rectangle is the circumference of the tube;

[0060] The temperature measurement point determined on the thermocouple board is specifically the welding of the thermocouple:

[0061] The welding of the thermocouple is the same as that of the traditional welded thermocouple. First, mark the center of the cut platinum plate, and then weld the thermocouple piece 2 to the platinum plate. The size of the thermocouple piece 2 is 10mm×10mm×1mm according to the standard.

[0062] Step 2: overlap and weld the positive and negative poles of the even wire 4 on the temperature measuring point;

[0063] The positive and negative ends of the thermocouple 4 are overlapped and welded to the center point of the platinum thermocouple. The welding direction of the thermocouple 4 is predetermined. The thermocouple 4 cannot be welded perpendicular to the plate. If so, the radius of the thermocouple 4 will be larger after turning from one side, and the space inside the platinum thermocouple tube 1 cannot meet the requirements. Therefore, during the welding process, the thermocouple 4 is directly welded to one side in the length direction of the rectangular plate.

[0064] Furthermore, welding wire needs to be added to the welding point to form a 3mm platinum ball to ensure that the welding point has a certain strength. The detailed structure of the local part is as follows: Figure 3 As shown, the final overall structural style is as follows Figure 4 shown.

[0065] Furthermore, in the embodiment of the present invention, the platinum thermocouple sheet 2 may not be used on the thermocouple in some areas according to the size of the tube body, and the positive and negative electrodes of the thermocouple may be directly welded to the center of the plate of the platinum thermocouple tube 1, thereby achieving more sensitive and accurate measurement.

[0066] Step 3: Roll the galvanic plate into a tube, and weld the longitudinal seam of the galvanic tube after the tube is rolled into a tube;

[0067] The coiling of the galvanic tube 1 uses a semicircular trough mold to roll the rectangular plate of the platinum galvanic tube into a tube. During this process, attention should be paid to the protection of the galvanic wire 4 and the root weld point to avoid stress on the galvanic wire during the coiling process. After the tube is rolled into shape, the longitudinal butt weld of the platinum galvanic tube is welded by butt welding, and the weld is polished and polished to ensure that the outer surface has the same smoothness as other areas of the platinum galvanic tube. The cross-sectional view after the tube is rolled is shown as follows: Figure 5 As shown;

[0068] Step 4: Insert the cannula along the end of the even wire so that the cannula is placed outside the even wire;

[0069] The insertion of the alumina sleeve, after the platinum-gold thermocouple tube 1 is formed and welded, two thermocouple wires led out from one side are respectively inserted from two holes of the alumina sleeve 5 which is customized in advance. The alumina sleeve described herein has an outer diameter which is 1mm to 3mm larger than the inner diameter of the platinum-gold thermocouple tube 1, ensuring the smoothness of the insertion process. In addition, the alumina sleeve 5 has two independent positive and negative holes, and the diameter of the holes is about 20% larger than the diameter of the thermocouple wires, ensuring the smoothness of the insertion process.

[0070] After the two wires are respectively inserted into the two holes of the sleeve, the alumina sleeve 5 is slowly moved towards the inside of the platinum-gold thermocouple tube 1. During the movement, the depth of insertion is constantly confirmed by measuring the remaining length outside. Finally, the alumina sleeve 5 is inserted to a distance of about 3mm to 5mm from the center welding temperature measuring point. The final structure is shown in Figure 1

[0071] Step 5: Fill the inside of the thermocouple tube with fine powder until the inside of the thermocouple tube is filled, and then seal the end of the thermocouple tube.

[0072] After the alumina sleeve 5 is inserted in place, the gap of 1mm to 3mm between the outer diameter of the sleeve and the inner diameter of the platinum-gold thermocouple tube 1 is finely filled with alumina filling powder. The filling needs to be done from both ends of the platinum-gold thermocouple tube 1. One end can be filled quickly because there is no thermocouple and alumina sleeve 5. Finally, the matching filling of both ends ensures that all gaps inside the platinum-gold thermocouple tube are sealed by alumina filling powder. The alumina filling powder described herein has a main component AL2O3 content > 99%, and the content of Fe2O3 is < 0.15%, to ensure that the harmful impurity Fe element pollutes the platinum-gold material and the risk of "poisoning". The particle size of the entire filling material needs to be ≤0.2, to ensure the density and smoothness of the powder filling. Finally, the alumina filling powder is used to block the two end ports of the platinum-gold thermocouple tube 1, to ensure that the fine powder inside does not flow out.

[0073] Welding of the assembly and the platinum channel, after the entire plug-in welding thermocouple assembly is assembled, the welding of the assembly and the platinum channel is started. The area of the platinum channel that needs to be measured has been calibrated in advance, and the two ends of the calibrated position have been punched in advance to form an insertion welding hole matching the outer diameter of the platinum-gold thermocouple tube. The diameter of the hole is 0.2mm to 0.5mm larger than the outer diameter of the platinum-gold thermocouple tube, to ensure the smooth insertion of the platinum-gold thermocouple tube. Finally, the two ends of the platinum-gold thermocouple tube are welded to the platinum channel body by adding welding wire.

[0074] In actual measurement, the thermocouple wire 4 located outside the thermocouple tube is used to connect the wiring end, and cooperates with the external temperature measurement system to realize the temperature measurement of the glass liquid.​

[0075] Referring to Figures 6 to 7 Two specific application embodiments disclosed by the embodiments of the present application are as follows:

[0076] One is a standard round pipe and the other is a flat pipe, but both can be installed and customized by the method provided by the present application, thereby realizing accurate and long-term reliable monitoring of the center glass liquid temperature.

[0077] The method disclosed by the embodiments of the present application is tested to show that the temperature measurement accuracy is equivalent to that of the conventional welded thermocouple, the temperature measurement accuracy can reach ±1.0℃ in the temperature range of 0℃ to 1000℃, the temperature measurement accuracy can reach ±2.0℃ in the temperature range of 1100℃ to 1600℃, the actual decay period is prolonged by 70% compared with the conventional welded thermocouple, the decay amount is reduced by 65%, the temperature detection of the center area of the glass liquid is improved from 100℃ to 150℃ to within 5℃ compared with the conventional plug-in thermocouple, and the improvement effect is very significant, and the application will play an important guiding role in the subsequent platinum channel process production.

[0078] The above is only the preferred embodiment of the present application and is not used to limit the present application, and for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A thermocouple device for measuring the temperature of molten glass, characterized in that: The invention comprises a galvanic tube (1), wherein a temperature measuring point (3) is provided inside the galvanic tube (1), a galvanic wire (4) is provided on the temperature measuring point (3), and a sleeve (5) is provided on the outer side of the galvanic wire (4); The end of the thermocouple wire (4) sequentially passes through the sleeve (5) and the end of the thermocouple tube (1) away from the temperature measuring point (3); the preparation method of the thermocouple device for measuring the temperature of the glass liquid comprises the following steps: S1: Select the thermocouple plate and determine the temperature measurement point on the thermocouple plate; S2: overlap and weld the positive and negative poles of the wire on the temperature measuring point; S3: Rolling the galvanic plate into a tube to form a galvanic tube, and welding the longitudinal seam of the galvanic tube; S4: Insert the cannula along the end of the even wire so that the cannula is placed outside the even wire; S5: Fill the inside of the galvanic tube with fine powder until the inside of the galvanic tube is completely filled and then seal the end of the galvanic tube.

2. A thermocouple device for measuring the temperature of molten glass according to claim 1, characterized in that: The temperature measuring point (3) is arranged at the radially symmetrical center of the galvanic tube (1).

3. A thermocouple device for measuring the temperature of molten glass according to claim 1, characterized in that: A filler is provided in the gap inside the galvanic tube (1).

4. A thermocouple device for measuring the temperature of molten glass according to claim 3, characterized in that: The filler is alumina fine powder.

5. A thermocouple device for measuring the temperature of molten glass according to claim 1, characterized in that: The galvanic wires (4) are distributed along the inner axial direction of the galvanic tube (1).

6. A thermocouple device for measuring the temperature of molten glass according to claim 1, characterized in that: A thermocouple (2) is provided inside the galvanic tube (1), and the temperature measuring point (3) is provided on the thermocouple (2).

7. A thermocouple device for measuring the temperature of molten glass according to claim 1, characterized in that: The distance between the end of the sleeve (5) close to the temperature measuring point (3) and the temperature measuring point (3) is 3-5 mm.

8. A thermocouple device for measuring the temperature of molten glass according to claim 1, characterized in that: The dual wire (4) includes two wires, one is a positive electrode and the other is a negative electrode, and the positive electrode and the negative electrode are connected at their ends near the temperature measuring point (3); The sleeve (5) is provided with a positive electrode hole and a negative electrode hole corresponding to the even wire (4).

9. A thermocouple device for measuring the temperature of molten glass according to claim 8, characterized in that: The diameters of the positive electrode hole and the negative electrode hole are both larger than the diameter of the even wire (4).

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