Temperature measuring probe and manufacturing method thereof

Abstract

The invention discloses a temperature measuring probe and a manufacturing method thereof, and relates to the technical field of high temperature measurement, the temperature measuring probe comprises a pipe body with a hollow channel, one end of the pipe body is a measuring end, the measuring end of the pipe body is coated with a refractory material layer, and the refractory material layer is coated with an insulating layer. The pipe body and the refractory material layer are provided with through holes communicated with the hollow channel, and the pipe body is provided with a port communicated with the hollow channel; the ceramic tube is arranged in the through hole, and one end of the ceramic tube is in a closed state; and the sapphire optical fiber is inserted from the port of the tube body, passes through the hollow channel and extends into the ceramic tube. According to the invention, the measurement precision of the temperature measurement probe with the sapphire optical fiber can be further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature temperature measurement, and particularly relates to a temperature measurement probe and a manufacturing method thereof. Background Art

[0002] Optical fiber temperature measurement technology is an advanced temperature measurement method based on optical fibers and plays an important role in many fields. In the context of the rapid development of modern industry and technology, the demand for accurate temperature measurement is increasing day by day. Traditional temperature measurement methods such as thermocouples and thermal resistors have limitations in some special environments. For example, in environments with strong electromagnetic interference, flammable and explosive substances, and high voltages, these traditional temperature measurement methods may not work properly or pose safety hazards. The platinum / platinum-rhodium thermocouple widely used in the steel industry can measure temperatures up to 1800°C, but it is susceptible to electromagnetic radiation interference and may also be oxidized in the long term. Infrared thermometers can only be used to measure the surface temperature of molten metals because they cannot penetrate the molten pool.

[0003] Optical fiber temperature measurement technology has emerged as the times require. Optical fibers have many advantages such as anti-electromagnetic interference, corrosion resistance, small size, and light weight. It can work stably in harsh environments. Optical fiber thermometers can withstand high temperatures, are not affected by electromagnetic interference and thermal oxidation, and can accurately measure temperatures. At the same time, optical fibers can transmit signals over long distances, enabling temperature monitoring to be carried out over a wider range.

[0004] In the steel industry, optical fiber temperature measurement technology is playing an increasingly important role in measuring the temperature of high-temperature melts. At present, accurate measurement of the temperature of high-temperature melts in the steel production process is crucial. Traditional temperature measurement methods often have many problems when facing harsh environments such as high temperature, strong corrosion, and electromagnetic interference, while optical fiber temperature measurement technology has gradually become an ideal choice in the steel industry due to its unique advantages. Optical fiber temperature measurement has the characteristic of strong anti-electromagnetic interference ability and can still work accurately and stably in the complex electromagnetic environment at the steel production site. At the same time, it can withstand high-temperature environments, can directly contact high-temperature melts for measurement, and is not easily damaged like traditional temperature measurement equipment. In addition, optical fiber temperature measurement has a fast response speed, can monitor the change of melt temperature in real time, and provides timely data support for the precise control of the production process.

[0005] In terms of technological applications, many steel enterprises have successfully applied fiber optic temperature measurement technology to key equipment such as blast furnaces, converters, and electric furnaces, achieving accurate measurement of the temperature of high-temperature melts. By combining with an automated control system, production parameters can be adjusted in a timely manner according to temperature changes, improving production efficiency and product quality. However, despite the significant progress of fiber optic temperature measurement technology in the steel industry, there are still some challenges. Sapphire fiber performs excellently in high-temperature environments due to its high melting point and excellent physical and chemical properties. The melting point of single-crystal sapphire fiber is as high as 2050 °C, making it an ideal material for realizing high-temperature sensors. Sapphire fiber has good light transmittance in the wavelength range of 0.3 to 4.0 μm and has the characteristics of an optical waveguide. These properties make sapphire fiber have broad application prospects in fields such as high-temperature fiber sensing and near-infrared sensing. Experimental studies have shown that the optical transmission loss of sapphire fiber increases with time at high temperatures, but its stability superior to other materials at high temperatures makes it one of the materials that can withstand extreme high-temperature conditions. Therefore, issues such as how to further improve the measurement accuracy of sapphire fiber, enhance the stability and durability of the sensor, and reduce costs are all problems that need to be solved in the future. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a temperature measurement probe and a manufacturing method thereof, which can further improve the measurement accuracy of the temperature measurement probe with sapphire fiber.

[0007] The specific technical solution of the embodiments of the present invention is as follows:

[0008] A temperature measurement probe, the temperature measurement probe includes:

[0009] A tube body with a hollow channel, one end of the tube body is a measurement end, the measurement end of the tube body is coated with a refractory material layer, through holes communicating with the hollow channel are opened on the tube body and the refractory material layer, and a port communicating with the hollow channel is provided on the tube body;

[0010] A ceramic tube with one end closed and disposed in the through hole;

[0011] A sapphire fiber, the sapphire fiber is inserted from the port of the tube body, passes through the hollow channel and extends into the ceramic tube.

[0012] Preferably, the refractory material layer at least includes the following components by mass fraction: SiO2: 5%-7%, CaO: 1.5%-2.0%, Al2O3: greater than or equal to 90%.

[0013] Preferably, the outer surface of the sapphire fiber has a nano high-temperature resistant coating.

[0014] Preferably, the nano high-temperature resistant coating is an aluminum oxide nanorod coating.

[0015] Preferably, there are a plurality of through holes, and the plurality of through holes are circumferentially distributed around the tube body and the refractory layer; each through hole is provided with the ceramic tube;

[0016] There are a plurality of sapphire optical fibers, and the plurality of sapphire optical fibers respectively extend into the ceramic tubes in each through hole.

[0017] Preferably, the through holes are arranged at the side walls of the tube body and the refractory material layer and are near the end of the tube body.

[0018] Preferably, a skeleton assembly connected to the tube body is arranged in the refractory material layer. The skeleton assembly includes a plurality of first rod bodies and a plurality of second rod bodies. The first rod bodies extend along the axial direction of the tube body and are circumferentially distributed around the tube body. Each first rod body is connected to the tube body through at least two second rod bodies, and the at least two second rod bodies are distributed along the axial direction of the tube body and extend along the radial direction of the tube body.

[0019] Preferably, the tube body, the first rod bodies, and the second rod bodies are all made of steel materials, and the second rod bodies are respectively welded to the tube body and the first rod bodies.

[0020] Preferably, the temperature measuring probe includes: a metal wire, and the metal wire is wound around the circumferential direction of a plurality of the first rod bodies along the axial direction of the tube body; the refractory material layer covers the metal wire, the first rod bodies, and the second rod bodies.

[0021] Preferably, the refractoriness of the refractory material layer reaches 1800 degrees Celsius.

[0022] Preferably, the lower end of the tube body is hermetically connected through a lower end plate, and the upper end of the tube body is hermetically connected through an upper end plate; at least one blocking ring is connected to the side wall of the other end of the tube body; the port is located on the side wall of the other end of the tube body and above the uppermost blocking ring.

[0023] Preferably, a lifting assembly for lifting the tube body is connected to the upper end plate. The lifting assembly includes: a holding member connected to the upper end plate; a lifting ring connection block screwed on the holding member; and a lifting ring connected to the lifting ring connection block.

[0024] A manufacturing method of using the temperature measuring probe as described in any one of the above, the manufacturing method includes:

[0025] Coat the sapphire optical fiber with a nano high-temperature resistant coating;

[0026] A through hole is provided in the tube body, and a sapphire optical fiber with a nano high-temperature resistant coating is inserted into the tube body from the port of the tube body and extends into the ceramic tube through the hollow channel, and the ceramic tube is arranged in the through hole, and one end of the ceramic tube in a closed state faces outward;

[0027] A skeleton assembly is connected to the measurement end of the tube body, and a metal wire is wound around the skeleton assembly along the axial direction of the tube body;

[0028] Refractory material is processed outside the measurement end of the tube body having the skeleton assembly and the ceramic tube, so that the refractory material layer covers the skeleton assembly, the measurement end of the tube body and the ceramic tube to form a refractory material layer, and at least part of the end of the ceramic tube in a closed state leaks out.

[0029] The technical solution of the present invention has the following remarkable beneficial effects:

[0030] In the temperature measurement probe of the present application, the ceramic tube is communicated with the inside of the tube body, so that the sapphire optical fiber is inserted into the tube body from the port of the tube body and extends into the ceramic tube through the hollow channel, and most of the ceramic tube and the measurement end of the tube body are covered by using the refractory material layer, and it is ensured that the ceramic tube can be in contact with the medium to be measured. Through the above method, not only the ceramic tube and the tube body are protected to ensure the service life and stability of the temperature measurement probe under long-term measurement, but also the sapphire optical fiber can accurately determine the temperature of the medium to be measured through the thermal radiation of the ceramic tube.

[0031] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, and do not specifically limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can, under the teaching of the present invention, select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention.

[0033] Figure 1 It is a schematic structural diagram of the temperature measurement probe in the embodiment of the present invention;

[0034] Figure 2It is a cross-sectional view of a ceramic tube with a sapphire optical fiber in an embodiment of the present invention;

[0035] Figure 3 It is Figure 1 the cross-sectional view at C-C in

[0036] Figure 4 It is Figure 1 the cross-sectional view at B-B in

[0037] Figure 5 It is Figure 1 the structural diagram at A in

[0038] Reference numerals of the above drawings:

[0039] 1. Tube body; 11. Hollow channel; 12. Port; 13. Lower end plate; 14. Upper end plate; 15. Blocking ring; 16. Rib plate; 2. Refractory material layer; 3. Through hole; 4. Ceramic tube; 5. Sapphire optical fiber; 51. Nano high-temperature resistant coating; 6. Skeleton assembly; 61. First rod body; 62. Second rod body; 7. Metal wire; 8. Lifting assembly; 81. Holding member; 82. Hoop connection block; 83. Hoop; 100. Clamping device. Specific embodiments

[0040] Combined with the description of the specific embodiments of the present invention and the drawings, the details of the present invention can be more clearly understood. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and cannot be understood in any way as a limitation of the present invention. Under the teaching of the present invention, those skilled in the art can conceive any possible variations based on the present invention, and these should all be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0042] In order to further improve the measurement accuracy of the temperature measurement probe with the sapphire optical fiber 5, a temperature measurement probe is proposed in this application. Figure 1 It is a schematic structural diagram of the temperature measurement probe in an embodiment of the present invention. Figure 2 It is a sectional view of the ceramic tube with a sapphire optical fiber in an embodiment of the present invention. Figure 3 For Figure 1 the sectional view at C-C in, as Figures 1 to 3 shown, the temperature measurement probe may include: a tube body 1 having a hollow channel 11, one end of the tube body 1 being a measurement end, the measurement end of the tube body 1 being coated with a refractory material layer 2, through holes 3 communicating with the hollow channel 11 being formed in the tube body 1 and the refractory material layer 2, and a port 12 communicating with the hollow channel 11 being provided on the tube body 1; a ceramic tube 4 with one end in a closed state disposed in the through hole 3; a sapphire optical fiber 5, and the sapphire optical fiber 5 is inserted from the port 12 of the tube body 1, passes through the hollow channel 11 and extends into the ceramic tube 4.

[0043] The temperature measurement probe in this application is in communication with the inside of the tube body 1 through the ceramic tube 4, so that the sapphire optical fiber 5 is inserted from the port 12 of the tube body 1, passes through the hollow channel 11 and extends into the ceramic tube 4, and most of the ceramic tube 4 and the measurement end of the tube body 1 are coated with the refractory material layer 2 to ensure that the ceramic tube 4 can be in contact with the medium to be measured. Through the above method, not only the ceramic tube 4 and the tube body 1 are protected to ensure the service life and stability of the temperature measurement probe under long-term measurement, but also the sapphire optical fiber 5 can accurately determine the temperature of the medium to be measured through the thermal radiation of the ceramic tube 4.

[0044] The tube body 1 can have relatively high strength and certain high-temperature resistance. Generally speaking, the tube body 1 can be made of a high-temperature resistant metal material, such as steel material. Both ends of the tube body 1 can be in a closed state or in an open state. Preferably, in order to facilitate the coating of the refractory material layer 2 on one end of the tube body 1 which is the measurement end and prevent the refractory material from entering the tube body 1, one end of the tube body 1 which is the measurement end is in a closed state. For example, the lower end of the tube body 1 is hermetically connected through a lower end plate 13. Similarly, in order to protect the sapphire optical fiber 5 in the tube body 1, the upper end of the tube body 1 can be hermetically connected through an upper end plate 14. The tube body 1 has a hollow channel 11, and the hollow channel 11 is used for laying the sapphire optical fiber 5 so that the sapphire optical fiber 5 can extend into the ceramic tube 4.

[0045] One end of the tube body 1 is a measurement end. For example, one end of the lower end of the tube body 1 is the measurement end. The measurement end of the tube body 1 is coated with a refractory material layer 2, and the refractory material layer 2 can protect the tube body 1 to prevent the tube body 1 from directly contacting the medium to be measured. As feasible, the refractoriness of the refractory material layer 2 can reach 1800 degrees Celsius, so that the temperature measurement probe can measure the temperature of the medium to be measured in the temperature range of 1000 - 1750 °C for a long time. In order to make the refractoriness of the refractory material layer 2 reach 1800 degrees Celsius, as feasible, the refractory material layer 2 can at least include the following components by mass fraction: SiO2: 5% - 7%, CaO: 1.5% - 2.0%, Al2O3: greater than or equal to 90%. Among them, the bulk density of the refractory material layer 2 needs to reach 3.1 t / m 3 3. The tube body 1 and the refractory material layer 2 are provided with through holes 3 communicating with the hollow channel 11. The through holes 3 are used to accommodate the ceramic tube 4 so that the inside of the ceramic tube 4 can communicate with the hollow channel 11 of the tube body 1. The ceramic tube 4 is arranged in the through hole 3. One end of the ceramic tube 4 is in a closed state and faces outward. By the above method, one end of the ceramic tube 4 is exposed. When the temperature measurement probe is inserted into the medium to be measured to measure the temperature, one end of the ceramic tube 4 can be in direct contact with the medium to be measured, so as to realize the rapid heating of the ceramic tube 4, so that it generates thermal radiation. The thermal radiation signal can be reliably and stably transmitted to the near-infrared spectrometer through the sapphire optical fiber 5 to accurately measure the temperature of the medium to be measured.

[0046] To more stably maintain the stable and reliable transmission of the thermal radiation signal, the outer surface of the sapphire optical fiber 5 may have a nano high-temperature resistant coating 51. The nano high-temperature resistant coating 51 can further improve the high-temperature resistance performance of the sapphire optical fiber 5, which is generally reflected in the following two aspects. First, enhance thermal stability. The nano high-temperature resistant coating 51 can maintain stable performance in a high-temperature environment, effectively blocking the influence of the external high temperature on the sapphire optical fiber 5, preventing the optical fiber from changing its performance due to high temperature, such as thermal expansion and change of thermo-optic coefficient, and ensuring its normal operation in a high-temperature environment. Second, broaden the working temperature range. The nano high-temperature resistant coating 51 enables the sapphire optical fiber 5 to withstand higher temperatures and broadens the temperature range of its application. For example, in some scenarios that require working in an extremely high-temperature environment, the nano high-temperature resistant coating 51 can enable the sapphire optical fiber 5 to stably transmit signals under high-temperature conditions that it could not originally withstand, realizing the precise measurement and monitoring of parameters such as temperature and pressure. In other aspects, the nano high-temperature resistant coating 51 can protect the surface of the sapphire optical fiber 5, improve the optical performance of the sapphire optical fiber 5, and improve the temperature sensing function and electromagnetic shielding function of the sapphire optical fiber 5. Specifically, in terms of protecting the surface of the sapphire optical fiber 5, it can prevent mechanical damage. The nano high-temperature resistant coating 51 has high hardness and wear resistance, and can form a strong protective film on the surface of the optical fiber, reducing mechanical damage such as friction and scratching suffered by the optical fiber during use, improving the mechanical strength of the optical fiber, and extending its service life. It can also resist chemical corrosion. In some harsh chemical environments, the nano high-temperature resistant coating 51 can isolate the sapphire optical fiber 5 from contact with corrosive substances, preventing the surface of the optical fiber from being eroded by chemical substances and maintaining the optical performance and structural integrity of the optical fiber. For example, in the fields of petrochemical industry, etc., the optical fiber may come into contact with various corrosive chemical substances, and the nano high-temperature resistant coating 51 can effectively protect the optical fiber from corrosion. It can also reduce surface defects. The nano high-temperature resistant coating 51 can fill the tiny defects and pores on the surface of the optical fiber, making the surface of the optical fiber smoother, reducing the scattering and loss of light on the surface of the optical fiber, and improving the transmission quality of the optical signal. In terms of improving optical performance, the nano high-temperature resistant coating 51 can reduce light scattering and optimize the light transmission mode. The uniformity and smoothness of the nano high-temperature resistant coating 51 can reduce the scattering phenomenon of light during the transmission of the optical fiber, enabling the light to be transmitted more concentratedly in the optical fiber core, reducing the transmission loss, improving the intensity and stability of the optical signal, and thus realizing the transmission of the optical signal over a longer distance. Some specific nano high-temperature resistant coatings 51 can also match the optical characteristics of the sapphire optical fiber 5, optimize the light transmission mode, suppress the excitation of high-order modes, enable the optical signal to be transmitted in the optical fiber in a more ideal mode, and improve the demodulation accuracy and measurement accuracy of the signal. In addition, some nano high-temperature resistant coating 51 materials have temperature-sensitive characteristics. By coating this kind of coating on the sapphire optical fiber 5, real-time sensing of the ambient temperature can be achieved.When the temperature changes, the optical or physical properties of the coating will change accordingly. By detecting these changes, the temperature change can be accurately measured, and it can be well applied to the temperature monitoring field in high-temperature environments. In some environments with strong electromagnetic interference, the nano high-temperature resistant coating 51 can be made of materials with electromagnetic shielding performance to provide electromagnetic shielding protection for the sapphire optical fiber 5 and prevent the influence of external electromagnetic interference on the optical signal transmission, ensuring the stability and reliability of the optical fiber communication system.

[0047] Furthermore, the nano high-temperature resistant coating 51 can be selected as an aluminum oxide nanorod coating, which has the following special advantages compared with the conventional nano high-temperature resistant coating 51: higher hardness and wear resistance, excellent chemical stability and corrosion resistance, high thermal stability and heat insulation. Aluminum oxide itself has a very high hardness, with a Mohs hardness of up to 9, second only to diamond. The nanorod structure endows it with more excellent mechanical properties than ordinary nano coatings, enabling it to maintain a good shape and integrity in high-temperature environments, effectively resisting the erosion and friction of sand, particles, etc., reducing the wear and damage of the coating, and extending the service life of the coating. It is particularly suitable for equipment in harsh environments such as high-temperature industrial furnaces. Aluminum oxide has strong chemical inertness and is not easily reactive with chemical substances such as acids, alkalis, and salts. The high specific surface area and special structure of the nanorod coating can provide more effective protection in chemical corrosion environments. The aluminum oxide nanorod coating has a high melting point and thermal stability, and can withstand high temperatures without melting or deforming.

[0048] As a feasible solution, there can be multiple through-holes 3. The multiple through-holes 3 are distributed circumferentially around the tube body 1 and the refractory layer. Each through-hole 3 is provided with a ceramic tube 4. There are multiple sapphire optical fibers 5, and the multiple sapphire optical fibers 5 are respectively inserted into the ceramic tubes 4 in each through-hole 3. In this way, when the measurement end of the temperature measurement probe is inserted into the medium to be measured, the temperature of the medium to be measured at different angles in the circumferential direction of the measurement end can be measured, thereby making the temperature at this position in the medium to be measured more accurate. In order to reduce the depth of the temperature measurement probe inserted into the medium to be measured, the through-holes 3 can be arranged on the side walls of the tube body 1 and the refractory material layer 2 and near the end of the tube body 1.

[0049] As a feasible solution, there can be multiple through-holes 3, and the multiple through-holes 3 are arranged along the axial direction of the tube body 1. Each through-hole 3 is provided with a ceramic tube 4. There are multiple sapphire optical fibers 5, and the multiple sapphire optical fibers 5 are respectively inserted into the ceramic tubes 4 in each through-hole 3. In this way, when the measurement end of the temperature measurement probe is inserted into the medium to be measured, the temperature of the medium to be measured at different heights of the measurement end can be measured, thereby reflecting the temperature gradient at different depths of the medium to be measured.

[0050] By combining the above two methods, the temperature measurement probe can comprehensively reflect the temperature distribution of the medium to be measured, such as in a high-temperature molten bath. For example, the height of the slag in the high-temperature molten bath can be indirectly measured based on the temperature changes at different heights, providing important basic data for the smelting of the high-temperature molten bath.

[0051] As feasible, as Figure 3 shown, a skeleton assembly 6 connected to the pipe body 1 is provided inside the refractory material layer 2. The skeleton assembly 6 is used to make the refractory material layer 2 more firmly wrapped outside the measurement end of the pipe body 1, preventing the refractory material layer 2 from detaching from the pipe body 1. In a specific embodiment, the skeleton assembly 6 includes a plurality of first rod bodies 61 and a plurality of second rod bodies 62. The first rod bodies 61 extend along the axial direction of the pipe body 1 and are arranged circumferentially around the pipe body 1. Each first rod body 61 is connected to the pipe body 1 through at least two second rod bodies 62. The at least two second rod bodies 62 are arranged along the axial direction of the pipe body 1 and extend in the radial direction of the pipe body 1. By the above method, the first rod bodies 61 are used to effectively strengthen the firmness of the refractory material layer 2 in the radial direction of the pipe body 1, preventing the refractory material layer 2 from detaching from the pipe body 1 in the radial direction; and by using the second rod bodies 62, not only are the first rod bodies 61 connected to the pipe body 1, but also the firmness of the refractory material layer 2 in the axial direction of the pipe body 1 is effectively strengthened, preventing the refractory material layer 2 from detaching from the pipe body 1 in the axial direction.

[0052] As feasible, Figure 4 For Figure 1 the sectional view at B-B in Figure 4 shown, on the outer side wall of the upper part of the measurement end of the pipe body 1, there are rib plates 16 connected and extending along the axial direction of the pipe body 1 and distributed circumferentially around the pipe body 1. The refractory material layer 2 covers the lower part of the rib plates 16. Further, the upper ends of the first rod bodies 61 can be connected to the rib plates 16. For example, the upper ends of the first rod bodies 61 are arranged side by side with the rib plates 16, and the upper ends of the first rod bodies 61 are connected to the outer side wall of the rib plates 16. In this way, there is enough distance between the upper ends of the first rod bodies 61 and the rib plates 16 to achieve the connection between the two, such as a welded connection. By the above method, the firmness between the refractory material layer 2 and the pipe body 1 can be effectively strengthened, especially the firmness between the refractory material layer 2 and the pipe body 1 in the circumferential direction of the pipe body 1, preventing the refractory material layer 2 from rotating and detaching from the pipe body 1.

[0053] In order to facilitate the connection of the second rod bodies 62 to the pipe body 1 and the first rod bodies 61, as feasible, the pipe body 1, the first rod bodies 61, and the second rod bodies 62 can all be made of steel materials, and the second rod bodies 62 are respectively welded to the pipe body 1 and the first rod bodies 61.

[0054] As feasible, as Figure 3As shown in the figure, the temperature measurement probe may include: a metal wire 7, which is wound around the circumferential direction of a plurality of first rod bodies 61 along the axial direction of the pipe body 1. The refractory material layer 2 covers the metal wire 7, the first rod body 61, and the second rod body 62. For example, the metal wire 7 may be wound around the circumferential direction of a plurality of first rod bodies 61 in a spiral manner. The metal wire 7 preferably uses a high-temperature resistant material, such as steel wire. The presence of the metal wire 7 can, on the one hand, further strengthen the firmness between the refractory material layer 2 and the pipe body 1, preventing the refractory material layer 2 from breaking and detaching; on the other hand, the metal wire 7 can reduce the influence of external electromagnetic interference on the signal transmission of the sapphire optical fiber 5, so that the temperature measured by the temperature measurement probe is more accurate.

[0055] As a feasible solution, as Figure 1 shown in the figure, at least one blocking ring 15 is connected to the side wall of the other end of the pipe body 1. The blocking ring 15 may be connected to the area of the pipe body 1 that does not cover the refractory material layer 2. A clamping device 100 with a clamping component can clamp the pipe body 1 below the blocking ring 15 through the clamping component, and the clamping component abuts against the blocking ring 15, so as to fully support the weight of the temperature measurement probe in the vertical direction. For example, there may be two blocking rings 15, and the clamping components of the clamping device 100 are also two. The two clamping components clamp the pipe body 1 below the blocking ring 15 and respectively abut against their corresponding blocking rings 15. The port 12 may be located on the side wall of the other end of the pipe body 1 and above the uppermost blocking ring 15, so as to prevent the clamping component from clamping the port 12 when clamping the pipe body 1, affecting the entry and exit of the sapphire optical fiber 5. After the clamping device 100 clamps the temperature measurement probe, the lifting device connected to the clamping device 100 can be lifted and lowered, so as to insert the temperature measurement probe into the high-temperature molten pool.

[0056] As a feasible solution, Figure 5 for Figure 1 the structural diagram at position A in Figure 5 shown in the figure, a lifting component 8 for lifting the pipe body 1 may be connected to the upper end plate 14. When it is necessary to lift the temperature measurement probe, the hook body can be hung into the lifting component 8 to lift the temperature measurement probe. The lifted temperature measurement probe can be lowered into the medium to be measured, such as a high-temperature melt, such as molten steel and molten iron in the steel industry. In a specific embodiment, the lifting component 8 may include: a holding member 81 connected to the upper end plate 14; a ring connection block 82 screwed on the holding member 81; and a ring 83 connected to the ring connection block 82.

[0057] During the use of the temperature measurement probe, the measurement end of the temperature measurement probe is immersed in the medium to be measured, such as the molten steel in an electric arc furnace or a ladle in a refining furnace. When the ceramic tube 4 comes into contact with the medium to be measured, the ceramic tube 4 will generate thermal radiation, and the thermal radiation signal is coupled out of the temperature measurement probe through the sapphire optical fiber 5 with a nano high-temperature resistant coating 51. Outside the temperature measurement probe, a multimode optical fiber is used to transmit the thermal radiation signal from the temperature measurement probe to a spectrometer. Then, a CNN-assisted model can be used to process the near-infrared thermal radiation spectrum in the thermal radiation signal and determine the temperature measured by the temperature measurement probe. In addition to the CNN model, a temperature calibration model based on the peak emission wavelength and emission intensity in the near-infrared window can also be used. Further, the spectrometer can transmit the measured temperature to a metallurgical model, and the metallurgical model will collect information such as additives, power supply, molten steel temperature, and molten steel weight. After that, the metallurgical model will combine machine learning algorithms and expert models for analysis and decision-making, so as to give guiding information for the next smelting operation.

[0058] The temperature measurement probe in this application can measure the temperature of the medium to be measured in the temperature range of 1000 - 1750 degrees Celsius, and can be applied to environments with severe electromagnetic interference and strong oxidants, with an error rate as low as 0.5%. It is especially suitable for the iron and steel industry, can continuously measure the temperature at different heights and angles of a high-temperature molten bath in real time, reflect the temperature gradient of the high-temperature molten bath, and monitor the thickness of the high-temperature molten slag based on the temperature changes at different heights, solving the problem that the high-temperature molten bath and the thickness of the slag cannot be continuously monitored in real time. Secondly, under the protection of the refractory layer 2, the service life of the sapphire optical fiber 5 for temperature measurement is extended, and continuous temperature measurement for multiple furnaces can be realized, which not only increases the number of temperature measurements, but also reduces the cost of temperature measurement for the high-temperature molten bath. Finally, using the temperature measurement probe can replace manual temperature measurement to achieve high-efficiency automatic temperature measurement, improve the production efficiency of the high-temperature molten bath, and reduce the energy consumption per ton of steel.

[0059] In this application, a manufacturing method using the temperature measurement probe as described above is also proposed. The manufacturing method includes:

[0060] Apply a nano high-temperature resistant coating 51 on the outside of the sapphire optical fiber 5. Further, the nano high-temperature resistant coating 51 can preferably be an aluminum oxide nanorod coating.

[0061] A through hole 3 is opened on the tube body 1, and the sapphire optical fiber 5 with a nano high-temperature resistant coating 51 is inserted into the ceramic tube 4 through the hollow channel 11 from the port 12 of the tube body 1, and the ceramic tube 4 is arranged in the through hole 3, with the closed end of the ceramic tube 4 facing outward.

[0062] Connect the skeleton component 6 to the measurement end of the tube body 1, and wind the metal wire 7 around the skeleton component 6 along the axial direction of the tube body 1. Further, a rib plate 16 extending along the axial direction of the tube body 1 and distributed circumferentially around the tube body 1 can also be connected to the outer side wall of the upper part of the measurement end of the tube body 1, and the rib plate 16 is then connected to the first rod body 61, such as by welding.

[0063] Process the refractory material outside the measurement end of the tube body 1 having the skeleton component 6 and the ceramic tube 4, so that the refractory material coats the skeleton component 6, the measurement end of the tube body 1, and the ceramic tube 4 to form a refractory material layer 2, and at least part of the end of the ceramic tube 4 in a closed state leaks out. For example, the refractory material can be applied to coat the skeleton component 6, the measurement end of the tube body 1, and the ceramic tube 4, and then baked to form a usable refractory material layer 2. In the above manner, the refractory material layer 2 is combined with the tube body 1, the skeleton component 6, and the ceramic tube 4 into one body.

[0064] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" describing a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not materially affect the basic novel features of the combination. Using the terms "comprising" or "including" to describe the combinations of elements, components, parts, or steps herein also contemplates embodiments consisting essentially of these elements, components, parts, or steps. By using the term "may" herein, it is intended that any attribute described as "may" include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of "a" or "an" used to describe an element, component, part, or step does not preclude other elements, components, parts, or steps.

[0065] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. The above embodiments are only for explaining the technical concept and characteristics of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A temperature measuring probe, characterized in that: The temperature measuring probe comprises: A tube body having a hollow channel, one end of the tube body being a measuring end, the measuring end of the tube body being covered with a refractory material layer, a through hole communicating with the hollow channel being provided on the tube body and the refractory material layer, and a port communicating with the hollow channel being provided on the tube body; A ceramic tube disposed in the through hole and having one end in a closed state; A sapphire optical fiber is inserted from the end of the tube body through the hollow channel and extends into the ceramic tube.

2. The temperature measuring probe according to claim 1, characterized in that: The refractory material layer at least comprises the following components in mass fractions: SiO2: 5%-7%, CaO: 1.5%-2.0%, Al2O3: greater than or equal to 90%.

3. The temperature measuring probe according to claim 1, characterized in that: The outer surface of the sapphire optical fiber is provided with a nanometer high temperature resistant coating.

4. The temperature measuring probe according to claim 3, characterized in that: The nano high temperature resistant coating is an aluminum oxide nanorod coating.

5. The temperature measuring probe according to claim 1, characterized in that: There are a plurality of through holes, and the plurality of through holes are distributed around the circumference of the tube body and the refractory layer; each of the through holes has the ceramic tube; There are multiple sapphire optical fibers, and the multiple sapphire optical fibers extend into the ceramic tube in each of the through holes respectively.

6. The temperature measuring probe according to claim 1, characterized in that: The through hole is arranged at the side wall of the tube body and the side wall of the refractory material layer, and is located near the end of the tube body.

7. The temperature measuring probe according to claim 1, characterized in that: The refractory material layer has a skeleton assembly connected to the tube body, and the skeleton assembly includes a plurality of first rods and a plurality of second rods, the first rods extend along the axial direction of the tube body and are distributed around the circumference of the tube body, each of the first rods is connected to the tube body through at least two of the second rods, and at least two of the second rods are distributed along the axial direction of the tube body and extend along the radial direction of the tube body.

8. The temperature measuring probe according to claim 7, characterized in that: The tube body, the first rod body, and the second rod body are all made of steel material, and the second rod body is respectively welded to the tube body and the first rod body.

9. The temperature measuring probe according to claim 7, characterized in that: The temperature measuring probe comprises: a metal wire, which is wound around the circumferential direction of the plurality of first rods along the axial direction of the tube; and the refractory material layer covers the metal wire, the first rod and the second rod.

10. The temperature measuring probe according to claim 2, characterized in that: The refractoriness of the refractory material layer reaches 1800 degrees Celsius.

11. The temperature measuring probe according to claim 1, characterized in that: The lower end of the tube body is sealed and connected via a lower end plate, and the upper end of the tube body is sealed and connected via an upper end plate; at least one blocking ring is connected to the side wall of the other end of the tube body; the port is located on the side wall of the other end of the tube body and above the uppermost blocking ring.

12. The temperature measuring probe according to claim 11, characterized in that: The upper end plate is connected with a lifting assembly for lifting the tube body, and the lifting assembly includes: a holding piece connected to the upper end plate; a lifting ring connecting block screwed on the holding piece; and a lifting ring connected to the lifting ring connecting block.

13. A method for manufacturing a temperature measuring probe according to any one of claims 1 to 12, characterized in that: The production method comprises: Apply nano-high temperature resistant coating to the sapphire optical fiber; A through hole is provided on the tube body, and a sapphire optical fiber with a nano-high temperature resistant coating is inserted from the end of the tube body through the hollow channel and extended into the ceramic tube. The ceramic tube is arranged in the through hole, and one end of the ceramic tube in a closed state faces outward; Connect a skeleton component to the measuring end of the tube body, and wind a metal wire around the skeleton component along the axial direction of the tube body; Inserting a sapphire optical fiber with a nano-high temperature resistant coating from the end of the tube body through the hollow channel and into the ceramic tube; The refractory material layer is processed to the outside of the measuring end of the tube body having the skeleton component and the ceramic tube, so that the refractory material layer covers the skeleton component, the measuring end of the tube body and the ceramic tube, and one end of the ceramic tube in a closed state at least partially leaks out.

Images