Device and method for improving reliability of thermocouple at channel cooling section during temperature rise stage

Abstract

A device for improving the reliability of a thermocouple at a channel cooling section during a temperature rise stage. A notch (5) is provided on a thermocouple sheet (2), and a thermocouple (4) is provided in the notch (5) of a groove-shaped structure. The notch (5) is bent upwards, such that a partial cavity is formed between the inside thereof and a cooling tube body (1), and the structure of the cavity needs to be sufficient for flexible movement of a temperature measurement point, i.e., a welding joint (3) of the thermocouple (4). The root of the thermocouple (4), i.e., the temperature measurement point (3) of the welding thermocouple, is accurately arranged in the notch (5), thereby ensuring good contact between the temperature measurement point and a measured object, and improving the accuracy of temperature measurement. The sliding thermocouple structure solves the problem of large-area damage to thermocouples at the top during a temperature rise stage, thus improving the reliability of thermocouples. Also provided is a method for the reliability of a thermocouple at a channel cooling section during a temperature rise stage.

Description

Device and method for improving reliability of channel cooling section thermocouple in temperature rising stage TECHNICAL FIELD

[0001] The present application belongs to the technical field of substrate glass manufacturing, and relates to a device and method for improving reliability of a channel cooling section thermocouple in a temperature rising stage. BACKGROUND

[0002] The hot end technology of substrate glass is a core part of its preparation, and each functional area section has different process settings. Generally, the internal temperature of most of the main body reaches above 1400 DEG C, and needs to be stably operated for a long time. The thermocouple is an important basic component for temperature monitoring and process control of the hot end equipment, and different numbers and points are designed according to different structures and different materials of each functional section. Generally, in the high-temperature area, i.e. above 1600 DEG C process interval, the thermocouple mainly has the problem of material oxidation and volatilization under long-term operation, while in the low-temperature area, the operation is relatively constant, and most of them can realize a service life of more than 4 years. In the top of the cooling section in the low-temperature area, a certain number of thermocouples are arranged, which are mainly used to monitor the flow and temperature of the glass liquid supplied to the forming area, but these thermocouples often have a large proportion of damage in the temperature rising stage. According to the statistical analysis of multiple lines, the basic rule of damage of the thermocouples in this area is summarized, that is, the damage mainly occurs in the late temperature rising stage, the temperature is mainly concentrated in 900 DEG C to 1200 DEG C, and the damage is obviously gathered compared with other parts. Through mechanism analysis, it is basically determined that the damage of the thermocouples at the top of the cooling is related to the collapse deformation and axial expansion displacement of the cooling pipe body in the high-temperature empty pipe stage. Since the pipe body is not filled with molten glass liquid at this time, the pipe body material gradually softens under the action of high temperature, and slowly creeps and collapses. In addition, the thermocouples at the top are sintered with the filling layer and cannot move freely, causing local stress to reach the tensile limit. Therefore, for the thermocouples at the top of the cooling pipe, under the condition that the strength of the thermocouple itself is difficult to be greatly improved at the current stage, the main scheme to solve the problem is to keep the mobility of the thermocouple and enable it to release the tensile stress within a certain distance. TECHNICAL PROBLEM

[0003] The thermocouple cannot move freely due to sintering with the filling layer, causing local stress to reach the tensile limit. TECHNICAL SCHEME

[0004] The present application aims to solve the problems in the prior art, and provides a device and method for improving reliability of a channel cooling section thermocouple in a temperature rising stage.

[0005] To achieve the above-mentioned purpose, the technical scheme is adopted as follows:

[0006] The application provides a device for improving the reliability of a thermocouple in a cooling section of a lifting passage during a heating stage, which comprises a thermocouple and a thermowell installed on a cooling pipe body.

[0007] An opening with a groove structure is formed on the thermowell, and a cavity is formed between the opening and the cooling pipe body, the root of the thermocouple is arranged in the cavity, and the root of the thermocouple is a temperature measuring point of a welded thermocouple.

[0008] Preferably, a ceramic fiber cloth is arranged above the thermowell.

[0009] Preferably, the surface area of the ceramic fiber cloth is greater than the surface area of the thermowell.

[0010] Preferably, a filling material is arranged above the ceramic fiber cloth.

[0011] Preferably, the opening is a rectangular gap, the gap width is greater than 1.2-1.5 times the diameter of the thermocouple, and the gap width is less than the diameter of the temperature measuring point.

[0012] Preferably, the length of the opening ranges from 20 mm to 50 mm.

[0013] Preferably, a plurality of openings are formed on the thermowell.

[0014] Preferably, a plurality of openings are formed on the thermowell.

[0015] Preferably, the thermowell is welded to the cooling pipe body.

[0016] The application further provides a method for improving the reliability of a thermocouple in a cooling section of a lifting passage during a heating stage.

[0017] The thermowell is installed on the cooling pipe body, the thermocouple is arranged at the opening on the thermowell, the opening with the groove structure enables the thermocouple to have displacement release when the cooling section expands or collapses, and the reliability of the thermocouple in the lifting passage is improved. Advantages

[0018] The device for improving the reliability of the thermocouple in the heating stage of the cooling section of the lifting channel is provided, and the traditional thermocouple may be fixed insecurely in the application scene, and is easily displaced or damaged by external force. The device solves the problem of fixing the thermocouple by opening a gap in the thermocouple sheet and arranging the thermocouple in the gap of the groove structure, so that the thermocouple is more stable and reliable in use. The gap is curved upward, so that a local cavity is formed between the inside of the gap and the cooling pipe body. The cavity structure is sufficient for the flexible movement of the thermocouple measurement point welding point. The position of the thermocouple measurement point is crucial to the accuracy of the measurement result. The device accurately sets the root of the thermocouple (the measurement point of the welded thermocouple) in the gap, ensures good contact between the measurement point and the measured object, and improves the accuracy of temperature measurement. Through the sliding thermocouple structure, the problem of large-area damage of the top thermocouple in the heating stage is solved, and the reliability of the thermocouple is improved.

[0019] Further, the root surface of the thermocouple is covered with a protective ceramic fiber cloth to keep the root movable in the thermocouple and not affected by the sintering of the surrounding filler.

[0020] Further, the length of the gap is determined to be 20-50 mm according to the actual expansion and collapse, which is too small to realize sufficient displacement release, and too large to cause local deformation of the cooling pipe body, which affects the bending of the thermocouple sliding path and the release of displacement, and the adjacent area is also provided with the same thermocouple monitoring point.

[0021] Further, a slit with the same size as the groove gap is opened on the ceramic fiber cloth before laying to ensure that the internal thermocouple wire can extend out of the slit and has the ability to protect the movement of the lower thermocouple sheet and the thermocouple measurement point. The ceramic fiber cloth has a larger area than the thermocouple sheet, which can ensure the coverage of the entire thermocouple sheet.

[0022] Further, the ceramic fiber cloth has the characteristics of high temperature resistance, heat insulation and insulation. It can effectively block the direct influence of the external high temperature environment on the thermocouple and the thermocouple sheet, prevent the thermocouple from being damaged due to excessive temperature, and ensure the accuracy and stability of the measurement. The ceramic fiber cloth also has a certain buffering effect, which reduces the damage of external impact and vibration to the thermocouple and the thermocouple sheet, and prolongs the service life.

[0023] Further, the ceramic fiber cloth combined with the filler material can form a good thermal insulation layer. This helps to reduce heat loss of the cooling pipe body, improve energy utilization efficiency, and prevent the temperature change of the surrounding environment from interfering with the temperature measurement of the cooling pipe body. The filler material fills in the ceramic fiber cloth, serving as a fixing and compacting role. It can make the ceramic fiber cloth more closely adhere to the thermocouple and thermocouple, prevent it from loosening or shifting, and ensure that the thermocouple is always in the correct measurement position. The filler material can also increase the stability of the entire device, reduce the shaking or vibration caused by external factors, and further improve the reliability of temperature measurement.

[0024] Further, the width of the rectangular gap is 1.2-1.5 times larger than the diameter of the thermocouple, so that the thermocouple can be easily placed in the gap. The gap width is less than the diameter of the temperature measuring point, which can effectively prevent the temperature measuring point from sliding out of the gap.

[0025] Further, multiple thermocouples and multiple gaps on each thermocouple can arrange thermocouples in different positions, so as to more comprehensively cover different areas of the cooling pipe body and obtain more accurate temperature distribution information. This can avoid measurement errors caused by the limitations of a single temperature measuring point, and provide more reliable temperature data for the operation and control of the equipment. If a thermocouple in a certain thermocouple or gap fails, the thermocouples in other thermocouples and gaps can still work, thereby reducing the impact of a single thermocouple failure on the entire temperature measurement system. This redundant design improves the reliability and stability of the device, ensuring that the temperature can be measured accurately and continuously during long-term operation. In different working scenarios, different parts of the cooling pipe body may need to be monitored or more detailed measurements may be needed according to the characteristics of temperature changes. The design of multiple thermocouples and gaps can flexibly adjust the arrangement position and number of thermocouples to meet different working conditions and needs. When the thermocouple needs to be maintained or replaced, the thermocouple in the thermocouple or gap that has a problem can be selected for processing, without affecting the normal work of other parts. This design makes maintenance more convenient and efficient, reducing downtime and maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0026] 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 embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0027] Figure 1 is a cross-sectional view of the thermocouple root of the present application.

[0028] Figure 2 is a structure of the thermocouple with a slot-shaped opening of the present application.

[0029] Figure 3 is a structure diagram of the device for reliability of the thermocouple in the lifting channel cooling section in the temperature rising stage of the present application.

[0030] Figure 4 is a principle of the movement and stress release of the thermocouple temperature measuring point of the present application.

[0031] Wherein: 1-cooling pipe body, 2-thermocouple, 3-welding point, 4-thermocouple, 5-opening, 6-ceramic fiber cloth, 7-filling material. Embodiment of the present application

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than 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.

[0033] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0034] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0035] In the description of the embodiments of the present application, it should be noted that, if the orientation or position relationship indicated by the terms "upper", "lower", "horizontal", "inner" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship when the product of the present application is used, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0036] 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.

[0037] In the description of the embodiments of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "arrange", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected, can be mechanically connected, or can be electrically connected, can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] The present application will be further described in detail below in combination with the drawings:

[0039] The present application provides a device for improving the reliability of the thermocouple in the heating stage of the cooling section of the lifting channel, as shown in FIGS. 1 to 4, which comprises a thermocouple 4 and a thermowell 2 installed on the cooling pipe body 1; a slot-shaped opening 5 is formed on the thermowell 2, and a cavity is formed between the opening 5 and the cooling pipe body 1, the root of the thermocouple 4 is arranged in the cavity, and the root of the thermocouple 4 is the temperature measuring point of the welded thermocouple.

[0040] A ceramic fiber cloth 6 is arranged above the thermowell 2, and a filling material 7 is arranged above the ceramic fiber cloth 6, the surface area of the ceramic fiber cloth 6 is greater than that of the thermowell 2, and the thermowell 2 is welded to the cooling pipe body 1 by a welding point 3. The opening 5 is a rectangular gap, the gap width is 1.2-1.5 times greater than the diameter of the thermocouple 4, and the gap width is less than the diameter of the temperature measuring point. The length of the opening 5 ranges from 20mm to 50mm.

[0041] The number of thermocouples 2 and openings 5 is designed in the following forms: 1) the thermowell 2 has several openings 5 formed on each thermowell 2; 2) several openings 5 are formed on the thermowell 2.

[0042] Specifically, referring to FIG. 1, which is a cross-sectional view of the root of the thermocouple, the cooling pipe body 1 is the functional section of the equipment required to be monitored by the thermocouple of the present application, which is a precious metal pipe through which glass flows, and the cross section is a flat pipe with a nearly elliptical shape. The main function of this structure is to achieve a large heat dissipation area and improve the overall heat dissipation efficiency, which is also the main function of the cooling section. Due to the special structure of the cooling section, the support of the top of the pipe body is limited. Therefore, during the heating stage, the glass liquid has not yet flowed in, and there is no effective support for it. When the temperature reaches 600℃ or above, the top of the pipe body will slowly collapse and deform, and with the extension of time and the further rise of temperature, the collapse of the pipe body will accelerate. At the same time, the high temperature also causes the cooling pipe body to expand synchronously along the length direction of the axis. The movement of the above two flat pipes together promotes the displacement of a certain point in the top region of the cooling section body 1.

[0043] In summary, there are three main ideas to solve the problem of top thermocouple tensile fracture caused by flat tube collapse and expansion. The first is to optimize the structural strength and high-temperature stability of the cooling tube body 1 through manufacturing and processing, which has certain technical difficulties. The main reason is that the industry has strict requirements for process and product performance, and the material has strict index requirements. The second is to improve the strength of the thermocouple itself to make it have enough tensile capacity. Considering the size limitation of the welded thermocouple wire and the external protection device, and the reverse tensile damage that too large strength may cause to the cooling tube body 1, the strength of the thermocouple wire can only be improved in a small range, but it still cannot resist the larger collapse and expansion force. The third is the idea of the present application, which is to design the temperature measuring point or wire path of the thermocouple to make the wire have a certain flexibility, so that the wire can release the tension when it is subjected to tension, and the stress of the wire can be released from the path process.

[0044] The thermocouple sheet 2 with a slot-shaped opening 5 is an innovative design based on the traditional welded thermocouple sheet. The main function of the traditional welded thermocouple sheet is to form a small buffer platform on the platinum body that needs to be monitored, which also serves as a welding platform for the thermocouple wire, avoiding direct welding of the thermocouple wire on the platinum body, which may affect the local quality of the platinum body. The thermocouple sheet 2 with a slot-shaped opening of the present application has a structure as shown in Figure 2, which has a slot-shaped opening feature 5. This feature can be made by cutting in the middle and bending locally from a complete rectangular sheet, or it can be made by one-stroke stamping during batch production.

[0045] The formed opening feature has the following requirements: the opening width is greater than 1.2-1.5 times the diameter of the wire, and less than the diameter of the thermocouple temperature measuring point welding point, which is in the range of 2.5mm-3.0mm. The length of the opening is determined according to the actual expansion and collapse amount in the range of 20mm-50mm. Too small cannot achieve enough displacement release, and too large will cause local deformation of the cooling tube body 1, which will affect the displacement release and the bending of the thermocouple sliding path. The adjacent area also has the same thermocouple monitoring point, so a reasonable range value is set for the design of the opening length.

[0046] As shown in Figure 1, the opening presents an upward bending, forming a local cavity between its interior and the cooling tube body 1. This cavity structure is sufficient for the flexible movement of the thermocouple temperature measuring point welding point. During the actual heating process of the cooling tube body 1, the inclined distribution of the tube body causes collapse and expansion, resulting in a backward equivalent displacement of the cooling tube body 1 at the thermocouple temperature measuring point. Therefore, when initially setting, the thermocouple temperature measuring point should be placed at the front end of the slot-shaped opening to ensure sufficient displacement.

[0047] Considering that the filling material 7 also exists outside the cooling pipe body 1 and the material has certain binding property at 500 DEG C, this has a fundamental influence on the implementation of the application. Therefore, a protective layer for preventing sintering of the filling material 7 needs to be added on the thermocouple 2, as shown in FIG. 3, a layer of ceramic fiber cloth 6 is laid outside the thermocouple 2, the material has high-temperature non-melting property at 1500 DEG C, the main component is Al2O3, the content is greater than or equal to 70%, and the thickness is 0.5 mm. Before laying, a gap with the same size as the slot-shaped opening 5 needs to be formed on the ceramic fiber cloth 6, so as to ensure that the internal thermocouple wire can extend from the gap and has the ability to protect the movement of the thermocouple 2 and the temperature measuring point of the thermocouple 4. The area of the ceramic fiber cloth 6 is larger than that of the thermocouple 2, and the coverage of the entire thermocouple 2 can be ensured.

[0048] In the actual temperature rising process, when the cooling pipe body 1 reaches a temperature above 600 DEG C, local collapse and overall expansion displacement occur, at this time, the slidable thermocouple temperature measuring point in the inside can produce matching displacement under the action of the thermocouple wire tensile stress, the principle is shown in FIG. 4, the thermocouple 4 moves along the slot-shaped opening 5 from one end to the other end, until the whole temperature rising process is completed, and the position of the thermocouple is finally fixed.

[0049] Through this way, the application in various sizes of cooling pipe body 1 has obtained significant effect, the failure rate of the top thermocouple in the temperature rising stage is reduced by nearly 80%, the process requirement of the temperature measuring capacity in this area is effectively guaranteed, and reliable guarantee is provided for the process control of large-flow glass.

[0050] The application provides a device and method for improving the reliability of a thermocouple in a lifting channel cooling section in a temperature rising stage, the thermocouple 2 is installed on the cooling pipe body 1, the thermocouple 4 is placed in the slot-shaped opening 5 on the thermocouple 2, the slot-shaped opening 5 enables the thermocouple 4 to release displacement when the cooling section expands or collapses, and the reliability of the thermocouple in the lifting channel is improved.

[0051] Therefore, the structure has the following advantages: 1) the release of the thermocouple wire tensile stress is realized through the small-range movement of the root of the thermocouple 4; 2) the root surface of the thermocouple 4 is covered with the protective ceramic fiber cloth 6, so that the root of the thermocouple 4 can move and is not affected by the sintering of the surrounding filling material 7; 3) the metal sheet welded on the surface of the cooling pipe body 1 is the thermocouple 2, which is different from the general thermocouple and has the open slot-shaped opening 5; 4) at least one metal sheet is used for limiting the temperature measuring point of the thermocouple 4, and at least one temperature measuring point can be realized by forming a plurality of openings on one metal sheet or by forming one opening by a plurality of metal sheets.

[0052] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. 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 device for improving the reliability of a thermocouple in a hot leg of a channel during a warm-up phase, characterized by The thermocouple (4) and the thermowell (2) installed on the cooling pipe body (1) are included. An opening (5) with a groove structure is formed on the thermowell (2), and a cavity is formed between the opening (5) and the cooling pipe body (1). The root of the thermocouple (4) is arranged in the cavity, and the root of the thermocouple (4) is the temperature measuring point of the welded thermocouple.

2. The device for reliability of a thermocouple in a temperature ramping phase of a lift channel cooling segment of claim 1, wherein, A ceramic fiber cloth (6) is arranged above the thermowell (2).

3. The device for reliability of a thermocouple in a temperature ramping phase of a lift channel cooling segment of claim 2, wherein, The surface area of the ceramic fiber cloth (6) is greater than the surface area of the thermowell (2).

4. The device for reliability of a thermocouple in a temperature ramp-up phase of a lift channel cooling segment of claim 2, wherein, A filling material (7) is arranged above the ceramic fiber cloth (6).

5. The device of claim 1, wherein, The opening (5) is a rectangular gap, the gap width is 1.2-1.5 times greater than the diameter of the thermocouple (4), and the gap width is less than the diameter of the temperature measuring point.

6. The device of claim 1, wherein, The length of the opening (5) ranges from 20mm to 50mm.

7. The device of claim 1, wherein, There are several thermowells (2), and an opening (5) is formed on each thermowell (2).

8. The device of claim 1, wherein, There are several openings (5) formed on the thermowell (2).

9. The device of claim 1, wherein, The thermowell (2) is welded on the cooling pipe body (1).

10. A method of improving the reliability of a thermocouple in a hot leg of a channel during a warm-up phase, the method comprising: The device for improving the reliability of the thermocouple in the cooling section of the lifting channel in the temperature rising stage comprises the lifting channel cooling section thermocouple according to any one of claims 1 to 9. The thermowell (2) is installed on the cooling pipe body (1), the thermocouple (4) is placed at the opening (5) on the thermowell (2), and the opening (5) with a groove structure allows the thermocouple (4) to have displacement release when it is expanded or collapsed in the cooling section, thereby improving the reliability of the thermocouple in the lifting channel.

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