A temperature measuring device and method for measuring the center temperature of a lead-bismuth alloy heating section pipe.

Abstract

This invention discloses a temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipeline, comprising a support tube, a thermocouple, and a guide rod. The support tube is radially inserted into the main body of the heating section pipeline, and has a first through hole and a second through hole at the connection points with the left and right side walls of the main pipeline. A detection window is provided in the middle of the support tube. The thermocouple and the guide rod are respectively sealed to the main pipeline. One end of the thermocouple has a detection part and a bending part, and one end of the guide rod has a guide surface. The end of the thermocouple with the detection part extends into the support tube through the first through hole, and the end of the guide rod with the guide surface extends into the support tube through the second through hole. The guide surface abuts against the bending part and forms the bending part so that the detection part extends out of the detection window. The temperature measuring device of this invention is easy to install, has high measurement accuracy, and is resistant to high temperature and corrosion, making it suitable for the working environment of liquid lead-bismuth alloy.

Description

Technical Field

[0001] This invention relates to the field of temperature measurement technology, and in particular to a temperature measuring device and method for measuring the center temperature of a lead-bismuth alloy heating section pipe. Background Technology

[0002] Lead-bismuth reactors possess significant advantages such as high inherent safety, miniaturization, and broad application prospects, making them an important research direction for advanced nuclear energy systems. Liquid lead-bismuth alloys are widely used in nuclear energy and thermal engineering due to their excellent thermal conductivity and radiation resistance. However, compared to conventional liquids like water, liquid lead-bismuth alloys exhibit unique thermophysical properties, including low Prandtl numbers, high thermal conductivity, high density, viscosity, and coefficients of thermal expansion. During natural circulation, they display unique thermo-hydraulic characteristics, significantly different from water in terms of flow heat transfer and system thermo-hydraulic characteristics, and also differing from liquid sodium coolant in their circulation flow. Therefore, precise positioning of the pipe center is required when measuring the temperature field inside the pipe. However, existing measuring equipment suffers from complex structures, inconvenient operation, and insufficient accuracy, making it difficult to meet the measurement requirements in high-temperature liquid metal environments.

[0003] Therefore, there is an urgent need for a simple and highly accurate center measurement method. Summary of the Invention

[0004] The main objective of this invention is to provide a temperature measuring device for the center temperature of a lead-bismuth alloy heating section pipeline. This device is easy to install, has high measurement accuracy, is resistant to high temperatures and corrosion, and is suitable for the working environment of liquid lead-bismuth alloy.

[0005] To achieve the above objectives, this invention proposes a temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipeline, comprising a support tube, a thermocouple, and a guide rod. The support tube is radially inserted into the main body of the heating section pipeline. A first through hole and a second through hole are provided at the connection points between the support tube and the left and right side walls of the main pipeline. A detection window is provided in the middle of the support tube. The thermocouple and the guide rod are respectively sealed to the main pipeline. One end of the thermocouple has a detection section and a bending section, and one end of the guide rod has a guide surface. The end of the thermocouple with the detection section extends into the support tube through the first through hole, and the end of the guide rod with the guide surface extends into the support tube through the second through hole. The guide surface abuts against the bending section, and the guide surface forms the bending section so that the detection section extends out of the detection window.

[0006] This invention provides a support tube radially installed inside the main body of the heating section pipe. The thermocouple extends into the main body of the pipe through the support tube, and the detection window of the thermocouple extends out of the support tube and contacts the liquid metal through a guide rod. This precisely controls the detection position to be located at the center of the main body of the pipe, while avoiding the displacement of the temperature sensing element caused by the liquid metal fluid, thereby achieving higher measurement accuracy.

[0007] Preferably, the temperature measuring device further includes a first mounting component and a second mounting component;

[0008] The first mounting assembly includes a first tube seat, a first clamping nut, and a first locking core. One end of the first tube seat is fixedly connected to the left end of the support tube, and the other end of the first tube seat is threadedly connected to the first clamping nut. The first locking core is disposed inside the first clamping nut.

[0009] The second mounting assembly includes a second tube seat, a second clamping nut, and a second locking core. One end of the second tube seat is fixedly connected to the right end of the support tube, and the other end of the second tube seat is threadedly connected to the second clamping nut. The second locking core is disposed inside the second clamping nut.

[0010] The thermocouple, with the detection part at one end, is inserted through the first mounting assembly and extends into the support tube through the first through hole; the guide rod, with the guide surface at one end, is inserted through the second mounting assembly and extends into the support tube through the second through hole.

[0011] The system includes a first mounting assembly and a second mounting assembly, allowing the thermocouple and guide rod to easily extend directly into the pipe body from outside the heating copper plate via these assemblies, thus simplifying operation. A tight seal is achieved through the use of a compression nut and a retaining clip.

[0012] Preferably, the first and second locking cores are made of copper. Copper is deformable, and when used with a clamping nut, it deforms to clamp the thermocouple and guide rod, thus achieving a sealed fixation. Furthermore, copper is resistant to high temperatures and corrosion, making it suitable for the working environment of liquid lead-bismuth alloys.

[0013] Preferably, the first tube seat includes a first thin tube seat and a first thick tube seat connected by threads. The first thin tube seat is fixedly connected to the left end of the support tube, and the first thick tube seat is threadedly connected to the first compression nut. The diameter of the first thin tube seat is smaller than the diameter of the first thick tube seat.

[0014] The second tube seat includes a second thin tube seat and a second thick tube seat connected by threads. The second thin tube seat is fixedly connected to the right end of the support tube, and the second thick tube seat is threadedly connected to the second compression nut. The diameter of the second thin tube seat is smaller than the diameter of the second thick tube seat.

[0015] Measuring the temperature inside the heating section of a liquid lead-bismuth alloy pipe usually requires drilling a hole in the heating copper plate surrounding the pipe. The copper plate is typically over 50 cm thick. The larger the diameter of the hole, the more uneven the heating surface of the pipe becomes and the more difficult it is to drill the hole. Therefore, it is necessary to minimize the diameter of the hole. Thus, a combination of a thin tube seat and a thick tube seat is used. The thin tube seat is placed inside the copper plate, and the thick tube seat is connected to the clamping nut. This simple assembly reduces assembly costs.

[0016] Preferably, the length of the detection window along the axial direction of the support tube is 58 mm. The size of the detection window can be adjusted so that the detection part of the thermocouple can easily extend out of the detection window by bending.

[0017] Preferably, the detection window faces the liquid inlet side of the pipe body, and the axis of the pipe body passes through the detection window. This positions the detection window at the center of the pipe body, allowing the thermocouple to extend out of the detection window and make direct contact with the liquid lead-bismuth alloy, resulting in more accurate detection.

[0018] Preferably, the length of the thermocouple extending into the support tube is 115mm to 130mm; the length of the guide rod extending into the support tube is also 115mm to 130mm. By adjusting the lengths of the thermocouple and the guide rod, the detection section of the thermocouple extends from the detection window of the support tube through the guide surface of the guide rod, facilitating contact with the liquid lead-bismuth alloy for temperature detection.

[0019] On the other hand, the present invention also provides a method for measuring the center temperature of a lead-bismuth alloy heating section pipe, comprising the following steps:

[0020] S1. The support pipe is installed radially through the inside of the heating section pipe body;

[0021] S2. Install the first mounting component and the second mounting component at both ends of the support pipe respectively, and weld them to the pipe body for sealing.

[0022] S3. Insert the thermocouple into the first mounting assembly and extend it into the support tube through the first through hole. Adjust the length and position of the thermocouple to ensure that its detection part is located in the center of the pipeline body.

[0023] S4. Insert the guide rod into the second mounting assembly and extend it into the support tube through the second through hole. Adjust the length of the guide rod so that the end of the thermocouple located in the support tube is bent along the guide surface to form a bend, thereby allowing the detection part to extend out of the detection window.

[0024] S5. Tighten the first and second clamping nuts to compress and deform the first and second clips, respectively fixing the thermocouple and guide rod to complete the positioning and sealing.

[0025] The method described in this invention is simple to operate and easy to install. It enables the thermocouple's temperature measuring section to be accurately positioned at the center of the lead-bismuth alloy heating section pipe without being offset by the impact of the liquid lead-bismuth alloy, resulting in high measurement accuracy. The material is resistant to high temperature and corrosion and is suitable for the working environment of liquid lead-bismuth alloy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the temperature measuring device in the temperature measuring state in the embodiment;

[0028] Figure 2 This is a schematic diagram of the structure of the first mounting component and the second mounting component in the embodiment;

[0029] Figure 3 This is a schematic diagram of the structure when the first mounting component is connected to the support tube and a thermocouple is inserted in the embodiment.

[0030] In the attached diagram: 1-pipe body, 2-support pipe, 21-first through hole, 22-second through hole, 23-detection window, 3-thermocouple, 31-detection section, 32-bending section, 4-guide rod, 41-guide surface, 5-first mounting assembly, 51-first pipe seat, 511-first thin pipe seat, 512-first thick pipe seat, 52-first clamping nut, 53-first clamping core, 6-second mounting assembly, 61-second pipe seat, 611-second thin pipe seat, 612-second thick pipe seat, 62-second clamping nut, 63-second clamping core.

[0031] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0033] It should be understood that the terms "center," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more. In addition, the term "comprising" and any variations thereof mean "at least comprising."

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0036] Example

[0037] Reference Figures 1-3This invention provides a temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe, comprising a support tube 2, a thermocouple 3, and a guide rod 4. The support tube 2 is radially inserted into the main body 1 of the heating section pipe. A first through hole 21 and a second through hole 22 are provided at the connection points between the support tube 2 and the left and right side walls of the main body 1. A detection window 23 is provided in the middle of the support tube 2. In practical applications, the support tube 2 can be pre-installed inside the main body 1, or it can be installed later, i.e., after drilling holes on both sides of the main body 1, the support tube 2 is inserted into the main body 1. The thermocouple 3 and the guide rod 4 are respectively sealed to the main body 1. One end of the thermocouple 3 has a detection part 31 and a bending part 32. One end of the guide rod 4 has a guide surface 41, which is an inclined surface. In practical applications, the surface of the inclined surface can be a plane or a concave arc surface. In some embodiments, one end of the thermocouple 3 with a detection part 31 is inserted into the support tube 2 through the first through hole 21, and one end of the guide rod 4 with a guide surface 41 is inserted into the support tube 2 through the second through hole 22. The lengths of the thermocouple 3 and the guide rod 4 are adjusted so that they contact each other at the detection window 23. The detection part 31 of the thermocouple 3 deviates from its path through the guide surface 41, thereby forming a bent part 32 at the end of the thermocouple 3. The bent part 32 finally abuts against the guide surface 41, and the detection part 31 extends out of the detection window 23. After the thermocouple 3 and the guide rod 4 are inserted into the support tube 2 and the detection part 31 finally extends out of the detection window 23, a known sealing method, such as welding, can be used to seal the thermocouple 3 and the guide rod 4 at the first through hole 21 and the second through hole 22.

[0038] In existing technologies, liquid lead-bismuth alloys exhibit different flow heat transfer and system thermo-hydraulic characteristics compared to conventional water circulation. Therefore, when measuring the temperature field inside a pipe, precise positioning of the pipe center is required. However, the high density of liquid lead-bismuth alloys results in strong impact on the thermocouple 3 during flow, easily causing positional displacement and significantly increasing the difficulty of high-precision measurement. Furthermore, the high-temperature liquid metal environment demands high standards for material resistance and corrosion resistance, which are difficult to meet measurement requirements. Traditional measuring equipment is complex in structure, inconvenient to operate, and lacks sufficient accuracy. This invention addresses this by setting a radial support tube 2 within the pipe body 1, placing the thermocouple 3 inside the support tube 2, and creating a detection window 23 on the support tube 2. A guide rod 4 extends the temperature-measuring section of the thermocouple 3 beyond the detection window 23, achieving precise positioning and avoiding the impact of the liquid lead-bismuth alloy flow affecting the thermocouple 3's measurement position, thus improving detection accuracy. The entire temperature measuring device is simple in design and easy to operate.

[0039] In this embodiment, as Figure 1 and Figure 2As shown, the temperature measuring device also includes a first mounting assembly 5 and a second mounting assembly 6. The first mounting assembly 5 includes a first tube seat 51, a first clamping nut 52, and a first locking core 53. One end of the first tube seat 51 is fixedly connected to the left end of the support tube 2, and the other end of the first tube seat 51 is threadedly connected to the first clamping nut 52. The first locking core 53 is disposed inside the first clamping nut 52. The second mounting assembly 6 includes a second tube seat 61, a second clamping nut 62, and a second locking core 63. One end of the second tube seat 61 is fixedly connected to the right end of the support tube 2, and the other end of the second tube seat 61 is threadedly connected to the second clamping nut 62. The second locking core 63 is disposed inside the second clamping nut 62. The thermocouple 3 has one end with a detection part 31 inserted into the first mounting assembly 5 and extends into the support tube 2 through the first through hole 21. The guide rod 4 has one end with a guide surface 41 inserted into the second mounting assembly 6 and extends into the support tube 2 through the second through hole 22. The lengths of the thermocouple 3 and the guide rod 4 are adjusted so that they contact each other at the detection window 23. The detection part 31 of the thermocouple 3 deviates from its path through the guide surface 41, thereby forming a bend 32 at the end of the thermocouple 3. The bend 32 finally abuts against the guide surface 41, and the detection part 31 extends out of the detection window 23. After the thermocouple 3 and the guide rod 4 are inserted into the support tube 2 and the detection part 31 finally extends out of the detection window 23, the first clamping nut 52 and the second clamping nut 62 are tightened. Since the first clip 53 and the second clip 63 are made of copper, the thermocouple 3 and the guide rod 4 are fixed and sealed by extrusion deformation. Since the outer perimeter of the liquid lead-bismuth alloy heating section pipe body 1 is usually wrapped with a thick copper plate for heating, the first mounting component 5 and the second mounting component 6 are used to pass through the copper plate and connect to the pipe body 1, making it easier for the thermocouple 3 and the guide rod 4 to enter the pipe body 1.

[0040] In order to minimize the aperture size of the holes on the copper plate, in this embodiment, as follows: Figure 2 and Figure 3 As shown, the first tube seat 51 includes a first thin tube seat 511 and a first thick tube seat 512 connected by threads. The first thin tube seat 511 is fixedly connected to the left end of the support tube 2, and the first thick tube seat 512 is threadedly connected to the first clamping nut 52. The diameter of the first thin tube seat 511 is smaller than the diameter of the first thick tube seat 512. The second tube seat 61 includes a second thin tube seat 611 and a second thick tube seat 612 connected by threads. The second thin tube seat 611 is fixedly connected to the right end of the support tube 2, and the second thick tube seat 612 is threadedly connected to the second clamping nut 62. The diameter of the second thin tube seat 611 is smaller than the diameter of the second thick tube seat 612. By combining the thin and thick tube seats, the thin tube seat is embedded in the copper plate, which reduces the difficulty of drilling holes in the copper plate and reduces costs. At the same time, the thick tube seat serves as a connector, perfectly matching the hole diameter of the clamping nut. The thin tube seat, the thick tube seat, and the clamping nut are all made of 316 stainless steel, which is resistant to high temperature and corrosion.

[0041] In this embodiment, the length of the detection window 23 along the axial direction of the support tube 2 is 58 mm. The size of the detection window 23 is adjusted so that the detection part 31 of the thermocouple 3 can easily extend out of the detection window 23 after bending. The length of the thermocouple 3 extending into the support tube 2 is 115 mm to 130 mm, and the length of the guide rod 4 extending into the support tube 2 is also 115 mm to 130 mm. The lengths of the thermocouple 3 and the guide rod 4 are adjusted so that the thermocouple 3 and the guide rod 4 contact each other at the detection window 23. The detection section of the thermocouple 3 extends out from the detection window 23 after being bent through the guide surface 41, facilitating contact with the liquid lead-bismuth alloy and positioning it at the center of the pipe for temperature detection.

[0042] Using the above-mentioned temperature measuring device, the present invention provides a method for measuring the center temperature of a lead-bismuth alloy heating section pipe, comprising the following steps:

[0043] S1. The support pipe 2 is installed radially through the inside of the heating section pipe body 1;

[0044] S2. Install the first mounting component 5 and the second mounting component 6 at both ends of the support pipe 2 respectively, and weld them to the pipe body 1 for sealing.

[0045] S3. Insert the thermocouple 3 into the first mounting assembly 5 and extend it into the support tube 2 through the first through hole 21. Adjust the length and position of the thermocouple 3 to ensure that its detection part 31 is located in the center of the pipe body 1.

[0046] S4. Insert the guide rod 4 into the second mounting assembly 6 and extend it into the support tube 2 through the second through hole 22. Adjust the length of the guide rod 4 so that the end of the thermocouple 3 located in the support tube 2 is bent along the guide surface 41 to form a bent part 32, thereby allowing the detection part 31 to extend out of the detection window 23.

[0047] S5. Tighten the first clamping nut 52 and the second clamping nut 62, and squeeze and deform the first clip 53 and the second clip 63 to fix the thermocouple 3 and the guide rod 4 respectively to complete the positioning and sealing.

[0048] According to the temperature measuring device and method provided in this embodiment, the length of thermocouple 3 extending into support tube 2 is adjusted to 123mm, and the length of guide rod 4 extending into support tube 2 is adjusted to 119mm. The copper plate is heated, and the center temperature of the main body 1 of the liquid lead-bismuth alloy heating section is measured under different heating powers. Due to the inherent characteristics of the liquid lead-bismuth alloy, a constant heat flow and a constant cold source are maintained in the closed pipe loop, ultimately forming a stable temperature distribution in the loop and a stable temperature stratification in the heating pipe. To verify the measurement accuracy of the measurement method described in this invention, measurements are also taken... The temperature at a distance of 1 mm from the pipe wall at the same cross-section of the pipe body 1 can also be measured using the well-known method of inserting a thermocouple. Since only the temperature at a distance of 1 mm from the pipe wall needs to be measured, a hole can be drilled directly in the pipe wall, and the length of the inserted thermocouple can be controlled. Alternatively, other well-known measurement methods can be used. The drilling position can be any other position on the same cross-section of the pipe body 1 where the first through hole 21 and the second through hole 22 are located. In this embodiment, the line connecting the drilling position at the 1 mm temperature of the pipe wall to the center of the pipe is perpendicular to the line connecting the first through hole 21 and the second through hole 22. The data obtained by measuring the pipe center temperature and the temperature at 1 mm from the pipe wall under different heating powers are compared with the CFD simulation data. The results are shown in Table 1.

[0049] Table 1

[0050]

[0051] It can be seen that by using the temperature measuring device and measurement method described in this invention, the error range between the measured pipe center temperature and the CFD simulation data under different heating powers is 1.8~3.1%, and the error range between the temperature difference between the pipe center and the point 1mm away from the pipe wall and the CFD simulation data is around 3%. The measurement accuracy is high and the position is precise.

[0052] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe, characterized in that, It includes a support tube (2), a thermocouple (3), and a guide rod (4); the support tube (2) is radially inserted inside the main body of the heating section pipe (1), and the support tube (2) is provided with a first through hole (21) and a second through hole (22) at the connection between the support tube (2) and the left and right sides of the pipe wall of the main body of the pipe (1), and a detection window (23) is opened in the middle of the support tube (2); the thermocouple (3) and the guide rod (4) are respectively sealed to the main body of the pipe (1); one end of the thermocouple (3) is provided with a detection part (31) and a bending part (32). One end of the guide rod (4) is provided with a guide surface (41). The thermocouple (3) is provided with the detection part (31) at one end, which extends into the support tube (2) through the first through hole (21). The guide rod (4) is provided with the guide surface (41) at one end, which extends into the support tube (2) through the second through hole (22). The guide surface (41) abuts against the bending part (32). The guide surface (41) is used to form the bending part (32) so that the detection part (31) extends out of the detection window (23).

2. The temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in claim 1, characterized in that, It also includes a first mounting component (5) and a second mounting component (6); The first mounting assembly (5) includes a first tube seat (51), a first clamping nut (52) and a first locking core (53). One end of the first tube seat (51) is fixedly connected to the left end of the support tube (2), and the other end of the first tube seat (51) is threadedly connected to the first clamping nut (52). The first locking core (53) is disposed inside the first clamping nut (52). The second mounting assembly (6) includes a second tube seat (61), a second clamping nut (62), and a second locking core (63). One end of the second tube seat (61) is fixedly connected to the right end of the support tube (2), and the other end of the second tube seat (61) is threadedly connected to the second clamping nut (62). The second locking core (63) is disposed inside the second clamping nut (62). The thermocouple (3) with the detection part (31) is inserted through the first mounting assembly (5) and extends into the support tube (2) through the first through hole (21); the guide rod (4) with the guide surface (41) is inserted through the second mounting assembly (6) and extends into the support tube (2) through the second through hole (22).

3. The temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in claim 2, characterized in that, The first card core (53) and the second card core (63) are made of copper.

4. The temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in claim 2, characterized in that, The first tube seat (51) includes a first thin tube seat (511) and a first thick tube seat (512) connected by threads. The first thin tube seat (511) is fixedly connected to the left end of the support tube (2), and the first thick tube seat (512) is threadedly connected to the first compression nut (52). The diameter of the first thin tube seat (511) is smaller than the diameter of the first thick tube seat (512).

5. The temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in claim 2, characterized in that, The second tube seat (61) includes a second thin tube seat (611) and a second thick tube seat (612) connected by threads. The second thin tube seat (611) is fixedly connected to the right end of the support tube (2), and the second thick tube seat (612) is threadedly connected to the second compression nut (62). The diameter of the second thin tube seat (611) is smaller than the diameter of the second thick tube seat (612).

6. The temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in claim 1, characterized in that, The length of the detection window (23) along the axial direction of the support tube (2) is 58 mm.

7. The temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in claim 1, characterized in that, The detection window (23) faces the liquid inlet side of the pipe body (1), and the axis of the pipe body (1) passes through the detection window (23).

8. The temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in claim 1, characterized in that, The length of the thermocouple (3) extending into the support tube (2) is 115mm to 130mm; the length of the guide rod (4) extending into the support tube (2) is 115mm to 130mm.

9. A method for measuring the center temperature of a lead-bismuth alloy heating section pipe, characterized in that, Using a temperature measuring device for measuring the center temperature of a lead-bismuth alloy heating section pipe as described in any one of claims 2 to 8, the measurement steps include: S1. The support pipe (2) is installed radially through the inside of the main body (1) of the heating section pipe; S2. Install the first mounting component (5) and the second mounting component (6) at both ends of the support pipe (2) respectively, and weld them to the pipe body (1) for sealing. S3. Insert the thermocouple (3) into the first mounting assembly (5) and extend it into the support tube (2) through the first through hole (21). Adjust the length and position of the thermocouple (3) to ensure that its detection part (31) is located in the center of the pipe body (1). S4. Insert the guide rod (4) into the second mounting assembly (6) and extend it into the support tube (2) through the second through hole (22). Adjust the length of the guide rod (4) so ​​that the end of the thermocouple (3) located in the support tube (2) is bent along the guide surface (41) to form a bend (32), thereby allowing the detection part (31) to extend out of the detection window (23). S5. Tighten the first clamping nut (52) and the second clamping nut (62) to compress and deform the first clip (53) and the second clip (63) to fix the thermocouple (3) and the guide rod (4) respectively to complete the positioning and sealing.

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