Quick-response multi-point temperature measuring device suitable for high-temperature liquid metal

Abstract

The invention discloses a quick-response multi-point temperature measuring device suitable for high-temperature liquid metal, and belongs to the technical field of measuring devices. Comprising a temperature measuring device and a fixed sealing device, the temperature measuring device comprises a thermocouple tube bundle, a thermocouple wire positioning cone and a thermocouple tube bundle side wall welding section; the fixing and sealing device comprises a fixing nut, a sealing ring, a connecting nut, an upper square flange, a flange gasket and a lower flange. The device is good in sealing effect and comprises a flange sealing mode and a clamping sleeve sealing mode, and the detachable requirement of the temperature measuring device can be met through the flange position; the thermocouple wire probe is in direct contact with fluid, so that the temperature measurement result is more accurate, and the response time of the thermocouple wire can be determined according to actual requirements; the main bodies of the temperature measuring elements are all arranged in the tube bundle, so that the temperature measuring device cannot be damaged due to large fluid flow; in addition, the thermocouple wire is used as a temperature measuring element, and compared with a sheathed thermocouple, the cost can be greatly reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of measuring devices, and specifically relates to a fast-response multi-point temperature measuring device suitable for high-temperature liquid metal. Background Art

[0002] In the liquid metal experimental system, precise temperature control is crucial. Due to the uneven flow or heating of the experimental working fluid in the pipeline, complex mixing of hot and cold fluids will occur in the converging components, resulting in significant temperature pulsations. These pulsations can cause drastic changes in the thermal stress inside the equipment. Long-term thermal stress cycles can easily cause thermal fatigue, which in turn leads to damage to the equipment structure or even failure. Therefore, accurately capturing the instantaneous changes in temperature during the mixing of hot and cold fluids is crucial to ensure the safety and stability of the equipment.

[0003] However, existing temperature measurement devices have some limitations: Single-point measurement: Most of the existing temperature measuring devices are single-point measurements, which can only obtain temperature data of a local area and cannot fully reflect the temperature distribution and change trend of the entire fluid.

[0004] Non-contact measurement: Existing multi-point temperature measurement devices are mainly non-contact measurements, such as infrared thermometers. Their measurement accuracy is greatly affected by factors such as the fluid surface state and ambient temperature, and it is difficult to accurately reflect the temperature distribution inside the fluid.

[0005] Armored thermocouple: Existing contact multi-point temperature measurement equipment generally uses armored thermocouples. Although the measurement accuracy is high, the response speed of armored thermocouples is slow, and multiple armored thermocouples in the same measurement system may interfere with each other, affecting the measurement accuracy and stability.

[0006] In order to solve the above technical problems, the present application proposes a fast-response multi-point temperature measuring device suitable for high-temperature liquid metal. Summary of the invention

[0007] The present application provides a fast-response multi-point temperature measurement device suitable for high-temperature liquid metal, which solves the problems existing in the existing multi-point temperature measurement technology.

[0008] The present application provides a fast-response multi-point temperature measuring device suitable for high-temperature liquid metal, which adopts the following technical solutions: including: A temperature measuring device, the temperature measuring device comprising a thermocouple tube bundle, a thermocouple wire positioning cone and a side wall welding section of the thermocouple tube bundle; the thermocouple wire positioning cone and the side wall welding section of the thermocouple tube bundle are both located at the lower part of the thermocouple tube bundle, have the same height position, and are symmetrically distributed on both sides of the thermocouple tube bundle; A fixed sealing device, the fixed sealing device comprising a fixed nut, a sealing ring, a connecting nut, an upper flange, a flange gasket, and a lower flange; the fixed nut, the connecting nut, the upper flange, and the lower flange are fixedly connected in sequence from top to bottom to form a cavity that is narrow at the top and wide at the bottom inside, which is used to place the thermocouple tube bundle; The sealing ring is arranged between the fixing nut and the connecting nut, and the flange gasket is arranged between the upper flange and the lower flange.

[0009] Furthermore, a lead-out section having a diameter close to the inner diameter of the flange is welded to the bottom surface of the lower flange, and the bottom surface of the lead-out section is welded to the outside of the pipeline.

[0010] Furthermore, a lead-out section is welded on the top surface of the upper flange, and an annular section is welded above the lead-out section for welding to the bottom surface of the connecting nut.

[0011] Furthermore, the upper flange and the lower flange have the same size, a plurality of upper flange connecting holes are arranged in a circular array on the edge of the upper flange, and a plurality of lower flange connecting holes are arranged in a circular array on the edge of the lower flange. The upper flange connecting holes and the lower flange connecting holes are in a one-to-one correspondence, and the upper flange and the lower flange are connected by multiple sets of bolts passing through the upper flange connecting holes and the lower flange connecting holes.

[0012] Furthermore, a perforated side wall and a slotted side wall are provided on one end of the thermocouple tube bundle.

[0013] Furthermore, the thermocouple wire positioning cone is placed on the perforated side wall of the thermocouple tube bundle, the thermocouple wire positioning cone is provided with holes, and the holes on the thermocouple wire positioning cone and the holes on the perforated side wall are in a one-to-one correspondence; the thermocouple tube bundle side wall welding section is installed on the slotted side wall of the thermocouple tube bundle.

[0014] Furthermore, the thermocouple tube bundle side wall welding section is welded to the slotted side wall by cold welding.

[0015] Furthermore, the inner diameter of the fixing nut is the same as the outer diameter of the thermocouple tube bundle.

[0016] Furthermore, the inner diameter of the connecting nut is consistent with the inner diameter of the fixing nut, and the threads of the fixing nut and the connecting nut match.

[0017] Furthermore, the fixing nut is provided with an internal slope of the nut, the top surface of the inner diameter of the connecting nut is provided with an upper slope of the nut, and the upper slope of the nut is consistent with the internal slope of the nut; the sealing ring is symmetrical up and down, and its top and bottom surfaces have a certain slope, the size of which matches the internal slope of the nut and the upper slope of the nut; the internal slope of the nut, the sealing ring and the upper slope of the nut are combined together to form a sealing condition, and a cavity is formed inside, which matches the outer diameter of the thermocouple tube bundle.

[0018] Beneficial effects of this application: 1. Fast response: Thermocouple wire has a fast response speed and can monitor temperature pulsation in real time and capture instantaneous temperature changes; it is suitable for monitoring rapid temperature changes of high-temperature liquid metal.

[0019] 2. Multi-point measurement: The temperature data of multiple points can be measured simultaneously to fully reflect the temperature distribution and change trend of the entire fluid; it is suitable for scenarios where multi-point monitoring of fluid temperature is required.

[0020] 3. Accurate measurement: The thermocouple wire probe is in direct contact with the fluid, with high measurement accuracy and little impact from the environment; accurate temperature data can be obtained, providing a reliable basis for experimental research and equipment control.

[0021] 4. Removable: The temperature measuring device can be disassembled through flange connection, which is convenient for maintenance and replacement. It is suitable for scenarios where the temperature measuring device needs to be replaced frequently, such as temperature measurement under different experimental conditions, temperature monitoring of different experimental equipment, etc.

[0022] 5. Anti-interference: The main body of the temperature measuring element is located inside the tube bundle, and only the temperature measuring probe is in direct contact with the fluid, which effectively avoids mutual interference between multiple temperature measuring elements; stable and reliable temperature data can be obtained without being affected by the external environment.

[0023] 6. Low cost: Compared with armored thermocouples, the cost of thermocouple wire is greatly reduced, which is economical and affordable; it is suitable for large-scale temperature measurement application scenarios and reduces experimental costs.

[0024] 7. Shock resistance: The temperature measuring device has a reasonable structural design and strong shock resistance, and will not be damaged by large fluid flow. It is suitable for shock and vibration conditions that may occur in high-temperature liquid metal circulation systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] For ease of explanation, the present application is described in detail through the following specific implementations and drawings.

[0026] Figure 1 It is the overall schematic diagram of the temperature measuring device of this application; Figure 2 is a cross-sectional view of the temperature measuring device of the present application; Figure 3 It is a schematic diagram of the structure of the thermocouple tube bundle of the present application; Figure 4 is a schematic diagram of the measurement point arrangement of the present application; Figure 5 is a schematic diagram of a fixing nut of the present application; Figure 6 is a schematic diagram of a connection nut of the present application; Figure 7is a general schematic diagram of the sealing device of the present application; Figure 8 is a schematic diagram of the upper flange of the present application; Fig. 9 is a schematic diagram of the lower flange of the present application; Fig.10 It is a schematic diagram of the detachable part of the temperature measuring device of the present application.

[0027] In the figure: 1, thermocouple tube bundle, 2, fixing nut, 3, sealing ring, 4, connecting nut, 5, upper flange, 6, flange gasket, 7, lower flange, 8, thermocouple wire positioning cone, 9, side wall welding section of thermocouple tube bundle; 201, internal thread of the nut, 202, internal slope of the nut; 401, nut thread, 402, nut bottom surface, 403, nut upper slope surface; 501, top surface of upper flange, 502, connecting hole of upper flange, 503, bottom surface of upper flange; 701, top surface of lower flange, 702, connecting hole of lower flange, 703, bottom surface of lower flange. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present application and the accompanying drawings to further describe the technical solutions of the present application, but the present application is not limited to these embodiments; in the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other.

[0030] like Figure 1-4 and Figure 8-10 A specific embodiment of a fast-response multi-point temperature measuring device suitable for high-temperature liquid metal is shown, comprising a temperature measuring device and a fixed sealing device.

[0031] Specifically, the temperature measuring device includes a thermocouple tube bundle 1, a thermocouple wire positioning cone 8 and a thermocouple tube bundle side wall welding section 9, wherein the thermocouple tube bundle 1 is used to wrap the thermocouple wire to form protection, the thermocouple wire positioning cone 8 is used to fix and position the thermocouple wire and reduce interference with the fluid physical field, the thermocouple wire positioning cone 8 and the thermocouple tube bundle side wall welding section 9 are both located in the bottom area of ​​the thermocouple tube bundle 1, and the two maintain the same height in the vertical direction and are symmetrically distributed on both sides of the thermocouple tube bundle 1, ensuring the accuracy and stability of the measurement.

[0032] Specifically, the structure of the thermocouple tube bundle 1 is made by traditional processes such as wire cutting and laser welding; the selection of the size of the thermocouple tube bundle 1 needs to be evaluated by the number of measuring points, and it should be ensured that the diameter of the thermocouple wires of all measuring points after being twisted into a bundle is smaller than the inner diameter of the thermocouple tube bundle 1, and a certain amount of excess space is reserved. In actual operation, the size of the thermocouple tube bundle 1 can be flexibly adjusted by adjusting the number of thermocouple measuring points, thereby reducing the impact of the introduction of multi-point temperature measuring devices on the fluid physical field.

[0033] Specifically, the thermocouple wire positioning cone 8 is manufactured by a 3D printing process into a mold matching the thermocouple tube bundle 1, and is filled with high-temperature resistant ceramic glue and removed after it is shaped.

[0034] Specifically, the fixed sealing device is composed of a fixed nut 2, a sealing ring 3, a connecting nut 4, an upper flange 5, a flange gasket 6 and a lower flange 7; the fixed nut 2 is installed above the connecting nut 4, and a sealing ring 3 is placed between the two to achieve a sealing effect. The fixed nut 2, the sealing ring 3, the connecting nut 4, the upper flange 5 and the lower flange 7 are fixedly connected from top to bottom in sequence, forming a cavity structure that is narrow at the top and wide at the bottom, and the cavity structure is used to accommodate the thermocouple tube bundle 1.

[0035] Specifically, the flange gasket 6 is placed between the upper flange 5 and the lower flange 7, and its material can be determined to be graphite, copper sheet, polytetrafluoroethylene, etc. according to actual conditions to ensure the sealing performance of the entire device.

[0036] In other preferred embodiments, Figure 8 and Fig. 9 As shown, Figure 8 As shown, the upper flange 5 includes an upper flange top surface 501, an upper flange connecting hole 502 and an upper flange bottom surface 503. The inner diameter size of the upper flange 5 should be sufficient to allow the temperature measuring device to move freely up and down inside the upper flange 5. A lead-out section is welded to the upper surface 501 of the upper flange, and an annular section is welded above the lead-out section for welding with the bottom surface 402 of the connecting nut to form a whole.

[0037] Specifically, the lower flange 7 includes a lower flange top surface 701, a lower flange connecting hole 702 and a lower flange bottom surface 703. A lead-out section close to the inner diameter of the flange is welded to the bottom surface of the lower flange 7. The bottom surface of the lead-out section is welded to the outside of the pipeline and welded to the experimental pipeline. The main function of the lower flange 7 is to realize the detachability of the temperature measuring device rather than for sealing. The ferrule composed of the fixing nut 2, the sealing ring 3 and the connecting nut 4 can realize the sealing function. The sealing device can be tightened first during installation to facilitate adjustment of the thermocouple wire positioning cone 8 to face the direction of the fluid flow, thereby ensuring the accuracy of the temperature measurement.

[0038] In other preferred embodiments, the upper flange 5 and the lower flange 7 have the same size, the upper flange 5 has a plurality of upper flange connecting holes 502 in a circular array on the edge, the lower flange 7 has a plurality of lower flange connecting holes 702 in a circular array on the edge, the upper flange connecting holes 502 and the lower flange connecting holes 702 are in a one-to-one correspondence, and the upper flange 5 and the lower flange 7 are connected by a plurality of sets of bolts passing through the upper flange connecting holes 502 and the lower flange connecting holes 702.

[0039] Specifically, the upper flange 5 and the lower flange 7 are connected by multiple sets of bolts passing through the upper flange connection holes 502 and the lower flange connection holes 702 to ensure firmness and reliability.

[0040] In other preferred embodiments, a perforated side wall and a slotted side wall are provided on one end of the thermocouple tube bundle 1 .

[0041] Specifically, one end of the thermocouple tube bundle 1 is an open end, and the other end is a sealed end. The sealed end of the thermocouple tube bundle 1 is the fluid temperature measurement point, that is, the lower end of the thermocouple tube bundle 1. The side wall of one side of the lower end of the thermocouple tube bundle 1 with multiple holes is a perforated side wall, and the side wall of the other side with a groove is a grooved side wall.

[0042] Specifically, the manufacturing process of the temperature measuring device is as follows: the thermocouple tube bundle 1 is processed through traditional processes such as wire cutting and laser welding, and a thermocouple wire positioning cone 8 made of high-temperature resistant ceramic glue is attached to the thermocouple tube bundle 1 using a mold. After the finished thermocouple wire is tested and the reading is normal, one end of the temperature measuring probe enters from the upper opening position of the thermocouple tube bundle 1 to ensure that the temperature measuring probe at each measuring point only extends about 1 mm long to ensure the accuracy of the temperature measuring position. After the thermocouple is inserted, the remaining part inside the thermocouple tube bundle 1 is filled with high-temperature resistant ceramic glue to form a seal. Finally, the thermocouple tube bundle 1 and the thermocouple tube bundle side wall welding section 9 are combined into one by cold welding technology to form a seal to ensure good sealing.

[0043] Specifically, the thermocouple wire positioning cone 8 is placed on the perforated side wall of the thermocouple tube bundle 1, and the thermocouple wire positioning cone 8 is provided with holes, and the holes on the thermocouple wire positioning cone 8 and the holes on the perforated side wall are in a one-to-one correspondence; the thermocouple tube bundle side wall welding section 9 is installed on the grooved side wall of the thermocouple tube bundle 1.

[0044] Specifically, the hole size of the hole on the thermocouple wire positioning cone 8 is recommended to be set to 1-1.5 mm, and the specific number can be determined according to actual conditions. In principle, there are no less than two thermocouple wires.

[0045] In other preferred embodiments, the inner diameter of the connecting nut 4 is consistent with the inner diameter of the fixing nut 2 , the fixing nut 2 and the connecting nut 4 have matching threads, and the inner diameter of the fixing nut 2 is the same as the outer diameter of the thermocouple tube bundle 1 .

[0046] Specifically, the inner diameter of the connecting nut 4 is consistent with the inner diameter of the fixing nut 2, and the inner diameter of the fixing nut 2 is the same as the outer diameter of the thermocouple tube bundle 1, so as to achieve a tight fit, ensure good sealing, and ensure fixing stability.

[0047] In other preferred embodiments, Figure 5-7 As shown, the fixing nut 2 is provided with an internal nut slope 202, the inner diameter top surface of the connecting nut 4 is provided with a nut upper slope 403, and the nut upper slope 403 is consistent with the internal nut slope 202; the sealing ring 3 is symmetrical up and down, and its top and bottom surfaces have a certain slope, the size of which matches the internal nut slope 202 and the nut upper slope 403; the internal nut slope 202, the sealing ring 3 and the nut upper slope 403 are combined together to form a sealing condition, and a cavity is formed inside, which matches the outer diameter of the thermocouple tube bundle 1.

[0048] Specifically, the specific structure of the fixing nut 2 can be seen Figure 5 , including an internal thread 201 of the nut and an internal slope 202 of the nut; wherein, one end of the fixed nut 2 is open, and the other end is provided with a small hole, the aperture of the small hole is consistent with the outer diameter of the thermocouple tube bundle 1, and a thread is provided inside, and the inner wall of the fixed nut 2 is provided with an internal slope 202 of the nut.

[0049] Specifically, the specific structure of the connecting nut 4 can be seen Figure 6 , including a thread surface 401, a bottom surface 402 and a nut upper slope surface 403; wherein, the connecting nut thread 401 matches the internal thread 201 of the nut; a nut upper slope surface 403 is provided on the top of the connecting nut 4, and the size of the slope surface is consistent with the size of the internal slope surface 202 of the nut; the nut bottom surface 402 is welded to the upper flange top surface 501 to form a whole; the inner diameter of the connecting nut 4 matches the outer diameter of the thermocouple tube bundle 1.

[0050] Specifically, the specific structure of the sealing ring 3 can be seen Figure 7 The sealing ring 3 is symmetrical up and down, and the top and bottom surfaces are provided with slopes, and the size of the slope is consistent with the size of the internal slope 202 of the nut and the upper slope 403 of the nut; the combination order and combination method of the three can be seen Figure 7 The threaded surface 201 of the fixing nut and the threaded surface 401 of the connecting nut can be coupled to each other. After the fixing nut 2 is tightened along the thread direction, the sealing ring 3 will be squeezed and deformed, so that it fits tightly on the thermocouple tube bundle 1, thereby achieving a sealing effect.

[0051] The installation process of the device using the technical solution of this application is as follows: Determine the size of each component according to the actual situation, complete the processing and make the temperature measuring device; determine the temperature section of the fluid to be measured, open a hole on the top of the pipeline, and weld the bottom surface 703 of the lower flange to the pipeline; put the upper flange 5, the connecting nut 4, and the fixing nut 2 on the outside of the thermocouple tube bundle 1, and weld the bottom surface 402 of the nut to the top surface 501 of the upper flange; adjust the direction of the thermocouple tube bundle 1, determine that the sealing ring 3 is in the correct position, and tighten the fixing nut 2. During the process, pay attention to the direction of the thermocouple wire positioning cone 8 facing the direction of the fluid flow; place the thermocouple tube bundle 1 through the lower flange 7 in the experimental pipeline, and tighten the multiple groups of bolts of the upper flange 5 and the lower flange 7; at this point, the whole set of the invention device is assembled.

[0052] After the experiment is completed, in order to realize the reuse of the fast-response multi-point temperature measuring device and facilitate the modification and processing of the experimental pipeline, the temperature measuring device can be disassembled; the specific structure after disassembly can be seen Fig.10 That is, except for the lower flange 7 connected with the pipeline, the other parts of the whole set of invention device can be disassembled as a whole, so as to realize the multiple use of the multi-point temperature measuring device.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] Those skilled in the art to which the present application belongs may make various modifications or additions to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present application or exceed the scope defined by the attached claims.

Claims

1. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal, characterized in that: include: A temperature measuring device, the temperature measuring device comprising a thermocouple tube bundle, a thermocouple wire positioning cone and a side wall welding section of the thermocouple tube bundle; the thermocouple wire positioning cone and the side wall welding section of the thermocouple tube bundle are both located at the lower part of the thermocouple tube bundle, have the same height position, and are symmetrically distributed on both sides of the thermocouple tube bundle; A fixed sealing device, the fixed sealing device comprising a fixed nut, a sealing ring, a connecting nut, an upper flange, a flange gasket, and a lower flange; the fixed nut, the connecting nut, the upper flange, and the lower flange are fixedly connected in sequence from top to bottom to form a cavity that is narrow at the top and wide at the bottom inside, which is used to place the thermocouple tube bundle; The sealing ring is arranged between the fixing nut and the connecting nut, and the flange gasket is arranged between the upper flange and the lower flange.

2. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 1, characterized in that: A lead-out section having a diameter close to the inner diameter of the flange is welded to the bottom surface of the lower flange, and the bottom surface of the lead-out section is welded to the outside of the pipeline.

3. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 2, characterized in that: A lead-out section is welded to the top surface of the upper flange, and an annular section is welded above the lead-out section for welding to the bottom surface of the connecting nut.

4. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 3, characterized in that: The upper flange and the lower flange have the same size, a plurality of upper flange connecting holes are arranged in a circular array on the edge of the upper flange, and a plurality of lower flange connecting holes are arranged in a circular array on the edge of the lower flange. The upper flange connecting holes and the lower flange connecting holes are in a one-to-one correspondence, and the upper flange and the lower flange are connected by a plurality of sets of bolts passing through the upper flange connecting holes and the lower flange connecting holes.

5. The fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 1, characterized in that: A perforated side wall and a slotted side wall are provided on one end of the thermocouple tube bundle.

6. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 5, characterized in that: The thermocouple wire positioning cone is arranged on the perforated side wall of the thermocouple tube bundle. The thermocouple wire positioning cone is provided with holes. The holes on the thermocouple wire positioning cone and the holes on the perforated side wall are in a one-to-one correspondence. The thermocouple tube bundle side wall welding section is installed on the slotted side wall of the thermocouple tube bundle.

7. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 6, characterized in that: The thermocouple tube bundle side wall welding section is welded to the slotted side wall by cold welding.

8. The fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 1, characterized in that: The inner diameter of the fixing nut is the same as the outer diameter of the thermocouple tube bundle.

9. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 8, characterized in that: The inner diameter of the connecting nut is consistent with the inner diameter of the fixing nut, and the threads of the fixing nut and the connecting nut match.

10. A fast-response multi-point temperature measuring device suitable for high-temperature liquid metal according to claim 9, characterized in that: The fixing nut is provided with an internal slope of the nut, the top surface of the inner diameter of the connecting nut is provided with an upper slope of the nut, and the upper slope of the nut is consistent with the internal slope of the nut; the sealing ring is symmetrical up and down, and its top and bottom surfaces have a certain slope, and the size matches the internal slope of the nut and the upper slope of the nut; the internal slope of the nut, the sealing ring and the upper slope of the nut are combined together to form a sealing condition, and a cavity is formed inside, which matches the outer diameter of the thermocouple tube bundle.

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