A measuring device for the response time of thermocouples

Abstract

The utility model discloses a kind of thermocouple response time measuring devices, including measuring pipeline, vertical pipeline, electric heating equipment and fixture, one end of measuring pipeline is provided with import, the other end is provided with export, vertical pipeline is vertically set on measuring pipeline, and with the inside of measuring pipeline is communicated, electric heating wire is set on the outer surface of measuring pipeline and vertical pipeline, fixture is located at the top of measuring pipeline, and fixed plate is vertically slidably arranged on fixture;High thermal conductivity lead bismuth liquid is used as medium in the application, heat can be quickly transferred to thermocouple and armored sleeve, reduce the lag caused by sleeve thermal resistance, fit actual working condition, reduce the measurement deviation caused by medium thermal property difference;Electric heating equipment precision temperature control, cooperate with flowing lead bismuth liquid, both ensure that step temperature test is accurate, and simulate actual dynamic heat exchange, avoid the response time misjudgment caused by heat accumulation at sleeve under static state.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor response time measurement technology, and specifically to a thermocouple response time measurement device. Background Technology

[0002] Thermocouples are widely used in industrial temperature measurement due to their mature manufacturing process and low cost. They can be classified into three types according to their structure: grounded, armored, and exposed. In lead-bismuth stacks, due to the corrosive nature of lead and bismuth, armored thermocouples are typically used for temperature measurement. When measuring the temperature of fluids that change rapidly, the thermocouple cannot immediately reflect the measured temperature; it requires a certain period of time to reach thermal equilibrium. Only when thermal equilibrium is reached can the temperature value reflected by the thermocouple be considered the actual temperature of the measured fluid.

[0003] The dynamic response characteristics of a sensor refer to the relationship between the temperature of the temperature sensor and the temperature increment of the measured medium. In practical applications, response time is often used to describe the response of a temperature sensor to a step temperature, that is, the time required for the output temperature of the thermocouple to reach 63.2% of the step temperature of the measured fluid when the fluid temperature undergoes a step change. This time is also called the time constant.

[0004] Existing methods for measuring thermocouple response time mainly include: laser step heating method, which uses a high-power laser to rapidly focus and heat the thermocouple measuring end, and achieves step temperature jumps by adjusting the number of lasers; comparison method, which mostly involves inserting the thermocouple from a low-temperature air medium into a constant-temperature water bath by hand or with the help of clamps; and water flow test method, such as the method proposed in CN114646408A, which involves inserting the thermocouple from a low-temperature air medium into a constant-temperature and constant-speed water bath with clamps.

[0005] However, the unique structure of armored thermocouples leads to a distinctive heat transfer problem during measurement: while heat from the measured fluid is transferred to the thermocouple, it inevitably diffuses into the armor sheath. Due to the sheath's limited heat capacity and thermal resistance, the conduction, accumulation, and dissipation of heat within the sheath create additional heat exchange processes. This causes a lag and attenuation in the temperature change sensed by the thermocouple's sensing element. Specifically, when the measured fluid temperature undergoes a step change, some heat is first absorbed by the sheath and then slowly transferred to the internal thermocouple. This results in the thermocouple's output temperature signal reflecting not only the thermal equilibrium between the measured fluid and the sensing element but also the sheath's own thermal response, leading to errors in the measured response time.

[0006] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a thermocouple response time measuring device, which aims to solve the problem that the sheath of the armored thermocouple affects the measurement accuracy of the thermocouple response time.

[0008] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0009] A thermocouple response time measuring device, comprising:

[0010] The measuring pipe has an inlet at one end and an outlet at the other end; the inlet is connected to an external pump body for introducing lead-bismuth liquid into the measuring pipe, and the outlet is connected to an external receiving device.

[0011] A vertical pipe is installed vertically on the measuring pipe and connected to the measuring pipe;

[0012] An electric heating device is disposed around the outer surface of the measuring pipe and the vertical pipe;

[0013] A clamp is located at the top of the measuring pipe; a fixing plate is vertically slidably mounted on the clamp for fixing the thermocouple and aligning the thermocouple with the vertical pipe.

[0014] Furthermore, the measuring pipe is a U-shaped pipe, the measuring pipe is arranged at an angle, and the connection point between the vertical pipe and the measuring pipe is the highest point on the measuring pipe.

[0015] Furthermore, the electric heating device includes:

[0016] A heating wire is arranged around the outer surface of the measuring pipe and the vertical pipe; the heating wire is connected to an external power source;

[0017] An insulation layer is wrapped around the outside of the heating wire.

[0018] Furthermore, the clamp includes:

[0019] A support is located at the top of the measuring pipe;

[0020] A slide rail is vertically mounted on one side of the bracket; the fixing plate is slidably mounted on the slide rail.

[0021] A bulletproof block is mounted on the bracket and cooperates with the fixing plate to prevent the fixing plate from rebounding.

[0022] A locking component is disposed on the bracket and cooperates with the fixing plate to lock the fixing plate.

[0023] Furthermore, the locking component includes:

[0024] A rotating plate is mounted on the bracket; a limit rod is provided on the rotating plate;

[0025] A triangular block is rotatably mounted on the rotating plate; the side of the triangular block near the fixed plate abuts against the limiting rod; the side of the fixed plate near the triangular block is provided with an open slot plate, and the triangular block cooperates with the open slot plate to restrict the rise of the open slot plate;

[0026] A tension spring, one end of which is located on the top of the triangular block and the other end of which is located on the bracket, so as to drive the triangular block to abut against the limiting rod;

[0027] An unlocking lever is rotatably mounted on one side of the bracket; a round rod is vertically mounted on one side of the unlocking lever, and the round rod cooperates with the triangular block to drive the triangular block to rotate away from the fixed plate and disengage from the limiting position of the opening slot plate.

[0028] Furthermore, the clamp also includes:

[0029] A trigger rod is rotatably mounted on the bracket; a stop bar is provided on the bracket, one end of the trigger rod abuts against the bottom wall of the open slot plate, and the other end is located at the bottom of the stop bar and abuts against the stop bar; when the end of the trigger rod near the stop bar rotates downward, it can drive the open slot plate to slide upward until it disengages from the trigger rod and slides down along the slide rail.

[0030] Furthermore, the clamp also includes:

[0031] Two sensors are respectively located at the top and bottom of the bracket.

[0032] Furthermore, the surface of the vertical pipe is covered with aluminum foil to cover the opening of the vertical pipe.

[0033] Furthermore, the measuring conduit includes:

[0034] The first pipeline is arranged at an angle; the lower part of the first pipeline is the inlet.

[0035] A first control valve is installed on the first pipeline and is used to control the opening and closing of the first pipeline;

[0036] The second pipe is perpendicular to the first pipe and is connected to the first pipe at its higher point;

[0037] The third pipe is perpendicular to the second pipe and is connected to the end of the second pipe away from the first pipe; the third pipe is arranged horizontally, and the vertical pipe is arranged vertically on the third pipe;

[0038] The fourth pipe is vertically disposed at the bottom of the third pipe and connected to the end of the third pipe away from the second pipe;

[0039] The fifth pipe is perpendicular to the fourth pipe and is connected to the end of the fourth pipe away from the third pipe; the end of the fifth pipe away from the fourth pipe is the outlet.

[0040] The second control valve is installed on the fifth pipeline and is used to control the opening and closing of the fifth pipeline.

[0041] Furthermore, the measuring conduit also includes:

[0042] A connecting pipe is connected to the inlet of the first pipe and the outlet of the fifth pipe; a third control valve is provided on the connecting pipe to control the on / off state of the connecting pipe.

[0043] Compared with the prior art, the beneficial effects of this utility model are:

[0044] In this invention, lead-bismuth liquid with high thermal conductivity is used as the test medium. Its heat can be quickly transferred to the thermocouple and the sheath, reducing the thermal response lag caused by the thermal resistance of the sheath. This is more in line with the heat transfer characteristics under the actual working conditions of lead-bismuth stacks and effectively reduces the measurement deviation caused by the difference in the thermal properties of the medium in existing methods. At the same time, the heating wires surrounding the outer surface of the measuring pipe and the vertical pipe can accurately increase and maintain the temperature of the lead-bismuth liquid. Combined with the flow of lead-bismuth liquid driven by the pump, it can ensure the accuracy of step temperature test through a stable temperature environment, and simulate the dynamic heat exchange between the fluid and the thermocouple under actual working conditions through the flow state, avoiding the misjudgment of response time caused by the accumulation of heat at the sheath under static medium. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0046] Figure 2 This is a schematic diagram of the measuring pipe structure of this utility model.

[0047] Figure 3 This is a schematic diagram of the heating wire and insulation layer structure of this utility model.

[0048] Figure 4 This is a schematic diagram of the fixture structure of this utility model.

[0049] Figure 5 This is a schematic diagram of the open slot plate structure of this utility model.

[0050] Figure 6 for Figure 5 Enlarged diagram of point A in the diagram.

[0051] Figure 7 This is a front view schematic diagram of the measuring pipe structure of this utility model.

[0052] The numbers in the diagram represent: 1. Measuring pipe; 11. First pipe; 12. Second pipe; 13. Third pipe; 14. Fourth pipe; 15. Fifth pipe; 16. Connecting pipe; 2. Vertical pipe; 3. Electric heating equipment; 31. Heating wire; 32. Insulation layer; 4. Clamp; 41. Fixing plate; 411. Open slot plate; 42. Bracket; 43. Slide rail; 44. Bulletproof block; 45. Locking assembly; 451. Rotating plate; 452. Limiting rod; 453. Triangular block; 454. Tension spring; 455. Unlocking rod; 456. Round rod; 46. Trigger rod; 47. Stop bar; 48. Sensor. Detailed Implementation

[0053] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0054] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "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 this utility model and simplifying the description, and do not indicate or imply that the device or element 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 this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] In view of the shortcomings of the prior art, this embodiment provides a device for measuring the response time of a thermocouple, which can be referred to as follows:

[0057] As attached Figure 1 and attached Figure 3 As shown, a thermocouple response time measuring device includes a measuring pipe 1, a vertical pipe 2, an electric heating device 3, and a clamp 4. The measuring pipe 1 has an inlet at one end and an outlet at the other. The inlet is connected to an external pump body for introducing lead-bismuth liquid into the measuring pipe 1. The lead-bismuth liquid is used to measure the thermocouple response time. The outlet is connected to an external receiving device for collecting the discharged lead-bismuth liquid. The vertical pipe 2 is vertically mounted on the measuring pipe 1 and communicates with the interior of the measuring pipe 1 to facilitate the insertion of the thermocouple into the flowing lead-bismuth liquid within the measuring pipe 1. The electric heating device 3 is arranged around the measuring pipe 1. On the outer surface of the vertical pipe 2, the temperature of the lead-bismuth liquid is increased and maintained to ensure the stability and accuracy of the measurement. The electric heating device 3 is connected to an external power source. The clamp 4 is located at the top of the measuring pipe 1, and a fixing plate 41 is vertically slidably installed on the clamp 4. The fixing plate 41 is used to fix the thermocouple, and the thermocouple corresponds to the vertical pipe 2. After the thermocouple is fixed, by sliding the fixing plate 41, the measuring end of the thermocouple can be slid into the vertical pipe 2 to contact the lead-bismuth liquid in the vertical pipe 2. Then, with the action of the fixing plate 41, it slides into the interior of the measuring pipe 1 to measure the thermocouple response time.

[0058] Measuring pipe 1 is made of a high-temperature resistant, lead-bismuth corrosion-resistant alloy material and is horizontally arranged. One end of the inlet is sealed to the output of an external pump via a flange, allowing pre-treated liquid lead-bismuth to be delivered to the pipe at a stable flow rate. The other end of the outlet is also connected to an external receiving device via a sealed structure, forming a circulation loop for the liquid lead-bismuth. This ensures continuous flow of the liquid lead-bismuth during measurement, simulating the dynamic characteristics of the fluid under actual working conditions. The pipe's inner diameter is designed based on the thermocouple measuring end size and the required lead-bismuth flow rate, ensuring continuous flow of the liquid lead-bismuth within the pipe and allowing the thermocouple measuring end to fully contact the fluid, reducing the impact of local temperature gradients on the measurement.

[0059] Vertical pipe 2 is welded vertically to the middle of measuring pipe 1 or above the outlet, connecting to the interior of measuring pipe 1. Its axis intersects perpendicularly with the axis of measuring pipe 1, forming a "T" shape. The inner diameter of vertical pipe 2 is slightly larger than the outer diameter of the thermocouple, providing a guiding channel for thermocouple insertion, reducing leakage of lead-bismuth liquid from the interface, and ensuring that the measuring end of the inserted thermocouple is precisely located in the center region of the lead-bismuth liquid flow within measuring pipe 1, avoiding interference from pipe wall temperature fluctuations on the measurement.

[0060] The clamp 4 is fixedly installed on the bracket 42 at the top of the measuring pipe 1. Its fixing plate 41 is vertically slidably engaged with the main body of the clamp 4 via the slide rail 43. The fixing plate 41 is provided with clamping holes adapted to the outer diameter of the thermocouple. The thermocouple can be fixed by bolts or elastic clamps to prevent the thermocouple from shaking due to the impact of the lead-bismuth liquid flow during the measurement. After the thermocouple is fixed, by driving the fixing plate 41 to slide down along the slide rail 43, the measuring end of the thermocouple can be accurately sent into the lead-bismuth liquid flow in the measuring pipe 1 through the vertical pipe 2. The insertion depth can be precisely controlled by the scale markings to ensure that the relative position of the thermocouple and the fluid is consistent in each measurement, thereby improving the repeatability of the measurement.

[0061] Compared to existing technologies, this measuring device offers significant advantages in measuring the response time of armored thermocouples. It uses lead-bismuth liquid as the measured medium, leveraging its high thermal conductivity to rapidly transfer heat, closely mirroring the actual heat transfer process. This overcomes measurement biases caused by differences in the thermal properties of the medium in existing methods, and is particularly effective in addressing the thermal response effects of the armored sheath, greatly improving measurement accuracy. Simultaneously, the electric heating device 3 surrounding the pipe, in conjunction with an automatic power controller, stabilizes the lead-bismuth liquid temperature at the set value with fluctuations less than the expected 0.2%, resolving the insufficient temperature stability issue of existing technologies. This provides a stable thermal environment for step temperature testing, ensuring the repeatability of response time measurements.

[0062] In addition, by driving the lead-bismuth liquid to flow continuously in the measuring pipe 1 through the pump, the dynamic state of the fluid in the lead-bismuth pile is simulated. Compared with the existing static water tank or air medium, it is closer to the heat exchange process between the thermocouple and the flowing fluid during actual operation, and avoids the misjudgment of response time caused by the accumulation of heat at the armored sleeve in a static environment.

[0063] In this embodiment, aluminum foil is provided on the surface of the vertical pipe 2 to cover the opening of the vertical pipe 2 and form a dense heat insulation barrier.

[0064] Aluminum foil has excellent heat reflection properties, which can effectively reflect the heat emitted from inside the vertical pipe 2, reduce the diffusion of heat from the opening of the vertical pipe 2 to the outside, and avoid the temperature drop inside the vertical pipe 2 and the temperature rise of thermocouples that have not entered the vertical pipe 2 due to heat leakage, thereby affecting the temperature stability of the lead bismuth liquid in the measuring pipe 1 and the measurement of the thermocouple response time.

[0065] In this embodiment, as shown in the appendix Figure 2 and attached Figure 7 As shown, the measuring pipe 1 is a U-shaped pipe, and the measuring pipe 1 is arranged at an angle. The connection point between the vertical pipe 2 and the measuring pipe 1 is the highest point on the measuring pipe 1.

[0066] Measuring pipe 1 adopts a U-shaped pipe structure and is arranged at an angle, which is adjustable. The specific angle is determined based on the flow rate and viscosity characteristics of the lead-bismuth liquid. The connection point between the vertical pipe 2 and measuring pipe 1 is located at the highest point of measuring pipe 1. This design has several advantages: Firstly, the highest point of measuring pipe 1 is a relatively stable pressure region during the flow of lead-bismuth liquid, which reduces the interference of liquid flow impact on the thermocouple measuring end, making the temperature change sensed by the thermocouple more stable and improving the accuracy of step temperature response measurement. Secondly, when the lead-bismuth liquid circulates in measuring pipe 1, the liquid flow velocity at the highest point is relatively uniform, which can avoid temperature fluctuations caused by sudden changes in local flow velocity.

[0067] Furthermore, by vertically arranging the vertical pipe 2, a liquid column will be formed inside the vertical pipe 2 under the pressure of the measuring pipe 1, effectively preventing the lead-bismuth liquid from overflowing; at the same time, setting the vertical pipe 2 at the highest point of the measuring pipe 1 can further reduce the height of the liquid column inside the vertical pipe 2, preventing the lead-bismuth liquid from overflowing.

[0068] In this embodiment, as shown in the appendix Figure 3 As shown, the electric heating device 3 includes a heating wire 31 and an insulation layer 32, which wraps around the heating wire 31, the measuring pipe 1, and the vertical pipe.

[0069] The heating wire 31 is made of high-resistance nickel-chromium alloy and is evenly distributed on the outer surface of the measuring pipe 1 and the vertical pipe 2 in a spiral winding manner. The winding density is adjusted according to the heat loss in different areas of the pipe to ensure uniform temperature of the lead-bismuth liquid in each section of the pipe. The heating wire 31 is wrapped with an insulation layer 32 to reduce heat loss to the external environment. Its two ends are connected to an external automatic power controller and power supply through high-temperature resistant wires, which can precisely adjust the heating power to stabilize the temperature of the lead-bismuth liquid in the measuring pipe 1 at the set value, and control the temperature fluctuation within 0.2% of the expected value, providing a stable thermal environment for step temperature testing.

[0070] The insulation layer 32 is made of high-temperature resistant, low thermal conductivity aluminum silicate fiber cotton or aerogel felt. The thickness is set according to the ambient temperature and insulation requirements. It is tightly wrapped around the outside of the heating wire 31, the measuring pipe 1, and the vertical pipe 2 to form a complete heat insulation barrier.

[0071] The insulation layer 32 effectively reduces the heat loss from the heating wire 31 to the external environment, reduces the impact of ambient temperature fluctuations on the temperature of the lead-bismuth liquid in the measuring pipe 1, and allows the heating wire 31 to maintain a low power output to keep the temperature of the lead-bismuth liquid stable at the set value. This not only saves energy but also avoids temperature overshoot caused by the heating wire 31 working at high power frequently, further improving the accuracy of temperature control.

[0072] In this embodiment, as shown in the appendix Figure 4 As shown, the fixture 4 includes a bracket 42, a slide rail 43, a bulletproof block 44, and a locking assembly 45. The bracket 42 is located at the top of the measuring pipe 1, and both the bracket 42 and the measuring pipe 1 can be placed on the experimental platform. Two slide rails 43 are provided on one side of the bracket 42. The two slide rails 43 are arranged vertically parallel and spaced apart. The fixing plate 41 is slidably mounted on the slide rail 43 by a slider and can slide along the length of the slide rail 43. The bulletproof block 44 is set on the bracket 42 and is located at the bottom of the fixing plate 41. When the fixing plate 41 slides down, it can fall on the bulletproof block 44 to prevent the fixing plate 41 from rebounding and affecting the measurement effect of the thermocouple. The locking assembly 45 is set on the bracket 42 and cooperates with the fixing plate 41 to lock the fixing plate 41 and prevent the fixing plate 41 from moving vertically during measurement.

[0073] Specifically, the bracket 42 can be H-shaped, with two slide rails 43 located at the left and right ends of the bracket 42; the bulletproof block 44 is located at the bottom of the bracket 42, and the locking component 45 is located on the side of the bracket 42 away from the fixed plate 41; when using the measuring device, the thermocouple can be fixed on the fixed plate 41 first, and then the lead-bismuth liquid can be heated and kept warm by starting the pump body and the heating wire 31. Then, the measuring end of the thermocouple can be lowered into the measuring pipe 1 by sliding the fixed plate 41 vertically. At the same time, the bulletproof block 44 prevents rebound and avoids affecting the thermocouple. The locking component 45 cooperates with the fixed plate 41 to lock, further improving the stability of the thermocouple response time measurement.

[0074] In this embodiment, as shown in the appendix Figure 5 and attached Figure 6As shown, the locking assembly 45 includes a rotating plate 451, a triangular block 453, a tension spring 454, and an unlocking rod 455. The rotating plate 451 is mounted on the bracket 42, and a rotating groove is provided in the middle of the rotating plate 451. The triangular block 453 is rotatably mounted in the rotating groove of the rotating plate 451 via a rotating shaft. A limit rod 452 is provided on the rotating plate 451. The limit rod 452 cooperates with the triangular block 453 to restrict the rotation of the triangular block 453 to one side. The triangular block 453 can rotate to the side away from the limit rod 452. The fixed plate 41 has an open slot plate 411 on the side near the triangular block 453, and a slot hole on the side of the open slot plate 411 away from the fixed plate 41. The slot and the triangular block 453 cooperate to limit the rise of the open slot plate 411; one end of the tension spring 454 is set on the top of the triangular block 453 and the other end is set on the bracket 42. Under the action of the tension spring 454, the triangular block 453 can be pulled to rotate towards the limit rod 452 and abut against the limit rod 452; the unlocking rod 455 is rotatably set on one side of the bracket 42, and a round rod 456 is vertically set on one side of the unlocking rod 455. The round rod 456 cooperates with the triangular block 453 to drive the triangular block 453 to rotate away from the fixed plate 41 and disengage from the limit on the open slot plate 411, so that the fixed plate 41 can slide upward.

[0075] In the initial state, the fixed plate 41 is positioned at the upper end of the bracket 42 under the action of external force. When measurement is required, the fixed plate 41 can be slid down. During the descent, the open slot plate 411 of the fixed plate 41 abuts against the hypotenuse of the triangular block 453, and the triangular block 453 is rotated away from the limit rod 452 until the open slot plate 411 disengages from the abutting triangular block 453. At this time, the fixed plate 41 lands on the bulletproof block 44, and the open slot plate 411 stops falling. Under the action of the tension spring 454, the triangular block 453 rotates towards the side closer to the limit rod 452. The sharp corner of the triangular block 453 is located in the slot of the open slot plate 411, and the vertical projection of the triangular block 453 coincides with the projection of the open slot plate 411. The bottom wall of the triangular block 453 can be used to limit the opening slot plate 411, preventing the opening slot plate 411 from rising under external force or vibration, which would affect the thermocouple measurement work.

[0076] When the work is completed and the thermocouple needs to be removed, the unlocking lever 455 can be rotated to lift the top of the triangular block 453, causing the triangular block 453 to rotate away from the limiting lever 452. The tension spring 454 is in the tension state, and at this time the bottom wall of the triangular block 453 is away from the open slot plate 411. The open slot plate 411 can be raised under external force to facilitate the disassembly of the thermocouple. By releasing the unlocking lever 455, the triangular block 453 returns to its initial state under the action of the tension spring 454.

[0077] In this embodiment, as shown in the appendix Figure 5As shown, the clamp 4 also includes a trigger rod 46, which is rotatably mounted on the bracket 42. The bracket 42 is provided with a stop rod 47. One end of the trigger rod 46 abuts against the bottom wall of the open slot plate 411, and the other end is located at the bottom of the stop rod 47 and abuts against it. Thus, the fixed plate 41 can be limited by the trigger rod 46; at the same time, the fixed plate 41 can be slid by rotating the trigger rod 46.

[0078] Specifically, when thermocouple measurements are required, the trigger rod 46 can be held at one end near the stop bar 47 and rotated away from the stop bar 47. The other end of the trigger rod 46 will lift the open slot plate 411, and the fixed plate 41 will slide upward along the slide rail 43 a certain distance until the top wall of the trigger rod 46 disengages from the bottom wall of the open slot plate 411. At this time, the open slot plate 411 disengages from the limit and slides downward under the action of the fixed plate 41 and its own weight until it falls on the bulletproof block 44 and is locked by the locking component 45.

[0079] In this embodiment, as shown in the appendix Figure 4 As shown, the fixture 4 also includes two sensors 48. The sensors 48 are existing technologies and can be photoelectric sensors 48 or proximity sensors 48. The two sensors 48 are located on the same side of the bracket 42 and are arranged vertically at intervals. The two sensors 48 cooperate with the fixing plate 41 to detect the position of the fixing plate 41, so as to record the falling time and arrival time of the fixing plate 41, so as to facilitate subsequent measurement and analysis.

[0080] In this embodiment, as shown in the appendix Figure 2 As shown, the measuring pipeline 1 includes a first pipeline 11, a first control valve, a second pipeline 12, a third pipeline 13, a fourth pipeline 14, a fifth pipeline 15, and a second control valve. The first pipeline 11 is arranged at an angle, with its lower end serving as the inlet. The higher end of the first pipeline 11 connects to the second pipeline 12, and the first pipeline 11 and the second pipeline 12 are arranged perpendicularly. The second pipeline 12 gradually rises from the end connected to the first pipeline 11 to the other end, meaning the second pipeline 12 is also at an angle. The third pipeline 13 connects to the end of the second pipeline 12 furthest from the first pipeline 11, and the third pipeline 13 is horizontal. The highest section of the measuring pipe 1 is the vertical pipe 2, which is vertically installed on the third pipe 13. The fourth pipe 14 is arranged vertically at the bottom of the third pipe 13, and one end of the fourth pipe 14 is connected to the end of the third pipe 13 away from the second pipe 12. The fifth pipe 15 is arranged perpendicular to the fourth pipe 14, and the end of the fifth pipe 15 away from the fourth pipe 14 is the outlet. The first pipe 11, the second pipe 12, the third pipe 13, the fourth pipe 14 and the fifth pipe 15 are connected in sequence to form a continuous channel. One end of the first pipe 11 is connected to the pump body, and one end of the fifth pipe 15 is connected to the external receiving equipment.

[0081] The first pipe 11 and the fifth pipe 15 are respectively equipped with a first control valve and a second control valve, which are used to control the opening and closing of the first pipe 11 and the fifth pipe 15.

[0082] The pipes are connected sequentially according to their inclined, horizontal, and vertical characteristics, with the third pipe 13 positioned at the highest point to effectively reduce air bubble accumulation and ensure stable liquid flow. The vertical pipe 2 is located within the third pipe 13, placing the thermocouple measuring end in a stable liquid flow zone and reducing the impact of flow shocks. Two control valves regulate the opening and closing of the inlet and outlet, facilitating control of measurement timing and maintenance, while considering flow stability, measurement accuracy, and operational flexibility. Simultaneously, the opening and closing angles of the two control valves can also be used to control the height of the liquid level column inside the vertical pipe 2, facilitating the measurement of the thermocouple response time.

[0083] In this embodiment, as shown in the appendix Figure 2 As shown, a connecting pipe 16 is provided between the inlet side of the first pipe 11 and the outlet side of the fifth pipe 15. A third control valve is provided on the connecting pipe 16 to control the passage of the connecting pipe 16.

[0084] The inlet of the first pipe 11 and the outlet of the fifth pipe 15 are both connected to the connecting pipe 16. The two openings of the connecting pipe 16 are connected to the external pump body and receiving equipment, respectively. The connecting pipe 16 can be used as a separate flow channel. Other devices that use lead-bismuth liquid for testing can be connected to the connecting pipe 16, thereby expanding the practicality of the testing device. When measuring the thermocouple response time, the third control valve can be closed and the first and second control valves can be opened to allow lead-bismuth liquid to flow through the measuring pipe 1. When other devices use lead-bismuth liquid for experiments through the connecting pipe 16, the lead-bismuth liquid can flow directly through the connecting pipe 16 by closing the first and second control valves and opening the third control valve, so as to facilitate the experiments and measurements of other devices.

[0085] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

Claims

1. A device for measuring the response time of a thermocouple, characterized in that, include: The measuring pipe has an inlet at one end and an outlet at the other end; the inlet is connected to an external pump body for introducing lead-bismuth liquid into the measuring pipe, and the outlet is connected to an external receiving device. A vertical pipe is installed vertically on the measuring pipe and connected to the measuring pipe; An electric heating device is disposed around the outer surface of the measuring pipe and the vertical pipe; A clamp is located at the top of the measuring pipe; a fixing plate is vertically slidably mounted on the clamp for fixing the thermocouple and aligning the thermocouple with the vertical pipe.

2. The thermocouple response time measuring device according to claim 1, characterized in that, The measuring pipe is a U-shaped pipe, the measuring pipe is arranged at an angle, and the connection point between the vertical pipe and the measuring pipe is the highest point on the measuring pipe.

3. The thermocouple response time measuring device according to claim 1, characterized in that, The electric heating device includes: A heating wire is arranged around the outer surface of the measuring pipe and the vertical pipe; the heating wire is connected to an external power source; An insulation layer is wrapped around the outside of the heating wire.

4. The thermocouple response time measuring device according to claim 1, characterized in that, The clamp includes: A support is located at the top of the measuring pipe; A slide rail is vertically mounted on one side of the bracket; the fixing plate is slidably mounted on the slide rail. A bulletproof block is mounted on the bracket and cooperates with the fixing plate to prevent the fixing plate from rebounding. A locking component is disposed on the bracket and cooperates with the fixing plate to lock the fixing plate.

5. The thermocouple response time measuring device according to claim 4, characterized in that, The locking component includes: A rotating plate is mounted on the bracket; a limit rod is provided on the rotating plate; A triangular block is rotatably mounted on the rotating plate; the side of the triangular block near the fixed plate abuts against the limiting rod; the side of the fixed plate near the triangular block is provided with an open slot plate, and the triangular block cooperates with the open slot plate to restrict the rise of the open slot plate; A tension spring, one end of which is located on the top of the triangular block and the other end of which is located on the bracket, so as to drive the triangular block to abut against the limiting rod; An unlocking lever is rotatably mounted on one side of the bracket; a round rod is vertically mounted on one side of the unlocking lever, and the round rod cooperates with the triangular block to drive the triangular block to rotate away from the fixed plate and disengage from the limiting position of the opening slot plate.

6. The thermocouple response time measuring device according to claim 5, characterized in that, The clamp also includes: A trigger rod is rotatably mounted on the bracket; a stop bar is provided on the bracket, one end of the trigger rod abuts against the bottom wall of the open slot plate, and the other end is located at the bottom of the stop bar and abuts against the stop bar; when the end of the trigger rod near the stop bar rotates downward, it can drive the open slot plate to slide upward until it disengages from the trigger rod and slides down along the slide rail.

7. The thermocouple response time measuring device according to claim 4, characterized in that, The clamp also includes: Two sensors are respectively located at the top and bottom of the bracket.

8. The thermocouple response time measuring device according to claim 1, characterized in that, The surface of the vertical pipe is covered with aluminum foil to cover the opening of the vertical pipe.

9. The thermocouple response time measuring device according to claim 1, characterized in that, The measuring conduit includes: The first pipeline is arranged at an angle; the lower part of the first pipeline is the inlet. A first control valve is installed on the first pipeline and is used to control the opening and closing of the first pipeline; The second pipe is perpendicular to the first pipe and is connected to the first pipe at its higher point; The third pipe is perpendicular to the second pipe and is connected to the end of the second pipe away from the first pipe; the third pipe is arranged horizontally, and the vertical pipe is arranged perpendicularly on the third pipe; The fourth pipe is vertically disposed at the bottom of the third pipe and connected to the end of the third pipe away from the second pipe; The fifth pipe is perpendicular to the fourth pipe and is connected to the end of the fourth pipe away from the third pipe; the end of the fifth pipe away from the fourth pipe is the outlet. The second control valve is installed on the fifth pipeline and is used to control the opening and closing of the fifth pipeline.

10. The thermocouple response time measuring device according to claim 9, characterized in that, The measuring conduit also includes: A connecting pipe is connected to the inlet of the first pipe and the outlet of the fifth pipe; a third control valve is provided on the connecting pipe to control the opening and closing of the connecting pipe.

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