A double-gap high-temperature material temperature-controlled irradiation device

Abstract

This application provides a dual-gap high-temperature material temperature-controlled irradiation device, comprising: an inlet pipe, a test section, an outer sleeve, an outer outlet pipe, an inner outlet pipe, a flange assembly, a cage assembly, a sealing head assembly, and a nozzle assembly; the second end of the test section is fixedly connected to the first end of the outer sleeve, and the outer peripheral wall of the outer sleeve is fixedly connected to the flange assembly; the outlet of the test section is fixedly connected to the first ends of the outer and inner outlet pipes respectively; the outer and inner outlet pipes are fixedly connected to the first ends of the cage assembly respectively; the second end of the cage assembly is sealed to the sealing head assembly and the nozzle assembly respectively; the inlet pipe is set in a reserved air pipe channel in the test section, the first end of the inlet pipe is sealed and fixed at the port of the first end of the test section, and the second end of the inlet pipe passes through the corresponding outlet of the flange assembly; this application can achieve a significant increase in irradiation temperature while ensuring that the temperature outside the device remains within a safe range, thus solving the problem of high-temperature irradiation.

Description

Technical Field

[0001] This application belongs to the field of research reactor material irradiation technology, specifically relating to a temperature-controlled irradiation device for high-temperature materials with dual air gaps. Background Technology

[0002] In recent years, with increasing demands for the safety and economy of nuclear energy systems and the need for deeper exploration, a new generation of nuclear energy systems has been developed based on third-generation systems, such as high-temperature gas-cooled reactors and gas-cooled fast reactors. To achieve higher safety, better economy, less nuclear waste emissions, and sustainable development, this new generation of nuclear energy systems places extremely high demands on fuel and cladding materials, such as excellent thermal conductivity and physical properties, and the integrity of cladding and structural materials under extreme operating conditions. Overall, the operating temperature of fourth-generation nuclear reactors is much higher than that of third-generation reactors, with some new-mass reactors having core outlet design temperatures approaching 1000℃. Therefore, studying the performance of cladding and structural materials after neutron irradiation under high-temperature environments is crucial for the development of new reactors. According to the traditional structure of temperature-controlled irradiation devices, achieving an irradiation temperature target of over 1000℃ presents the following contradictions: On the one hand, to achieve a high irradiation temperature, materials with high heat release, such as molybdenum, rhenium, and tungsten, should be selected for the irradiation device. However, these materials often have problems such as difficulty in welding and inability to achieve sealing. On the other hand, when the sample temperature inside the device reaches the irradiation temperature target, the interface temperature between the outer layer of the irradiation device and the coolant will also reach a high level, far exceeding the boiling point of the coolant, posing a safety risk to the research reactor. Summary of the Invention

[0003] Therefore, in response to the aforementioned contradictions and shortcomings, this application presents a novel irradiation device structure to achieve the goal of establishing a significant heat transfer temperature difference within the irradiation device. This ensures that while providing a temperature boost to the sample (reaching over 1000℃), the temperature outside the device is not excessively high, thus guaranteeing the achievement of high-temperature irradiation test indicators and the safety of the irradiation device.

[0004] To address the aforementioned issues, this application provides a dual-gap high-temperature material temperature-controlled irradiation device, comprising, from the air inlet direction to the air outlet direction: an air inlet pipe, a test section, an outer jacket, an outer air outlet pipe, an inner air outlet pipe, a squirrel cage assembly, a sealing head assembly, and an air nozzle assembly.

[0005] The second end of the test section is fixedly connected to the first end of the outer sleeve, the outer peripheral wall of the outer sleeve is fixedly connected to the connecting assembly, and the air outlet of the test section is fixedly connected to the first ends of the outer air outlet pipe and the inner air outlet pipe respectively.

[0006] The outer air outlet pipe and the inner air outlet pipe are respectively fixedly connected to the first end of the mouse cage assembly; the second end of the mouse cage assembly is respectively sealed to the sealing head assembly and the air nozzle assembly.

[0007] The first end of the air inlet pipe is sealed and fixed at the port of the first end of the test section, and the second end of the air inlet pipe passes through the corresponding outlet of the connecting assembly. The device introduces temperature-regulating gas through the air inlet pipe. The gas exchanges heat with the high-temperature material within the test section and is then discharged through the outer and inner air outlet pipes. Because this application employs an independent gas regulation and temperature control method for the inner and outer zones, i.e., a dual-gap design, it can expand the temperature regulation range and increase the temperature gradient, thereby meeting the high-temperature requirements of the inner layer and achieving more precise temperature control.

[0008] Furthermore, the test section includes at least: a partition tube, an upper end cover, a lower end cover, an inner upper end cover, an upper sleeve, a lower sleeve, and an inner upper end cover;

[0009] The upper sleeve, the lower sleeve, and the partition tube are fixedly connected in sequence to form an outer sealed space;

[0010] The separator tube, the lower end cap, and the inner upper end cap are sequentially fixedly connected to form an inner sealed space. This application forms an inner closed space and an outer sealed space. The double-layer sealing design of this application not only enhances the sealing performance of the test section but also effectively isolates the internal and external environments, preventing the exchange of heat and gas, thereby ensuring the accuracy and stability of the test. In addition, this application creates a large temperature gradient, so that when the inner sample reaches the required high temperature, a cooling device, such as a coolant, is provided on the outside of the test section. This application uses a two-layer air gap structure formed by the separator tube to achieve a step-by-step temperature decrease from the inside to the outside. If it were a single-layer air gap structure, when the sample reaches above 1000°C, the temperature of the sample-loading clamp would reach 800°C to 900°C, but the temperature of the tube wall in contact with the coolant would drop sharply. However, the temperature difference at the single-layer air gap would still reach 700°C or even 800°C, which may pose a risk to operational safety. However, this application employs a double-layer air gap, which is equivalent to having two cooling zones. The temperature is first reduced to around 500°C to 600°C in the inner air gap, and then reduced a second time in the outer air gap, bringing it down to the same temperature as the coolant. The temperature difference between each cooling step is reduced. This structure can achieve high-temperature performance during high-temperature irradiation tests and also provides greater assurance for the reliability of the device.

[0011] Furthermore, regarding safety, the inner sealed space of this application is a high-temperature region, exceeding 1000℃. Therefore, high-temperature resistant materials such as molybdenum and aluminum oxide are required. However, considering the welding difficulty of these materials, stainless steel partition tubes are used for the envelope of the inner sealed space. These tubes have good high-temperature resistance and are easy to weld. The inner air gap achieves the first cooling gradient from the inside to the outside, keeping the stainless steel partition tubes within a temperature range suitable for long-term normal operation and ensuring their performance. The outer air gap provides a certain level of insulation while preventing the coolant from overheating, thus avoiding any impact on reactor operation safety.

[0012] Furthermore, the test section also includes clamping blocks;

[0013] The clamping block is provided with a sample loading hole and a thermocouple loading hole, wherein the sample loading hole is used to load the sample, and the thermocouple loading hole is used to load the inner high-temperature thermocouple to monitor the sample temperature;

[0014] The outer peripheral wall of the clamping block is uniformly equipped with processing ribs to ensure the uniformity of the air gap in the circumferential direction and avoid the problem of one end having a large air gap and the other end having a small air gap due to eccentricity.

[0015] Furthermore, the test section includes an upper clamping block and a lower clamping block for the partition tube;

[0016] The lower clamping block of the partition tube is located at the first end port of the partition tube, and the upper clamping block is located at the second end port of the partition tube. The design of the upper and lower clamping blocks in this application provides additional support and fixation for the partition tube, enhancing the structural stability of the entire test section. Furthermore, by placing the clamping blocks at the ports of the partition tube, heat distribution within the test section can be better managed. The clamping blocks can act as bridges for heat conduction, transferring heat from one end of the partition tube to the other, or dissipating heat to the external environment through the heat dissipation structure on the clamping blocks.

[0017] Furthermore, the partition tube is provided with annular grooves to form intermittent heat-insulating air gaps. In this application, the intermittent distribution structure of air gaps forms a heat-insulating layer through the air gaps, thereby increasing the temperature of the inner layer. On the other hand, excessive heat can be quickly discharged to the coolant through the channels between the annular grooves where no air gaps are provided, thus ensuring that the overall temperature of the partition tube is maintained within the required temperature range.

[0018] At least two annular grooves are provided, and the annular grooves are symmetrically distributed about the axis of the separator tube;

[0019] The separator tube has a thermocouple hole at the annular groove for installing a thermocouple to monitor the temperature of the outer sealing space.

[0020] Furthermore, the test section also includes a mixing plate, which is an inner closed space support component. The mixing plate has multiple holes for mixing different gases input from the intake pipe evenly.

[0021] Furthermore, the test section also includes a spring support frame, which is a support component for the inner enclosed space, and a spring is installed at one end of the spring support frame.

[0022] Furthermore, the device also includes an airflow guide plate and an airflow guide tube;

[0023] The air intake pipe includes a first air intake pipe and a second air intake pipe, wherein the first air intake pipe is used to provide an air intake channel for the outer sealed space;

[0024] The second air intake pipe includes at least two pipes; at least two second air intake pipes pass through the lower end cover and are sealed with the airflow guide plate, and the airflow guide plate is fixedly sealed to one end of the airflow guide pipe.

[0025] Furthermore, the device also includes a measurement and control system, wherein the high-temperature thermocouple is connected in sequence to the outer air outlet pipe, the rat cage assembly, the sealing head assembly, and the measurement and control system via wires.

[0026] Furthermore, the test section also includes an upper insulation pad and a lower insulation pad, the upper insulation pad being disposed at the connection between the partition pipe and the upper sleeve, and the lower insulation pad being disposed at the connection between the partition pipe and the lower sleeve.

[0027] Beneficial effects

[0028] This invention designs a dual-gap high-temperature material temperature-controlled irradiation device. It establishes a significant heat transfer temperature difference within the device, enabling a substantial increase in irradiation temperature while ensuring the external temperature remains within a safe range. The design employs a partitioned tube structure, ensuring the area on the outside of the device in contact with the coolant is at a low temperature, protecting the device's pressure boundary, and creating an insulating air gap in the outer sealed space to provide temperature rise. The design utilizes independent structures for the inner and outer sealed spaces, achieving independent temperature control and providing enhanced temperature control capabilities. Molybdenum is used as a clamping block in the inner sealed space to increase temperature and reduce temperature differences between samples at different locations. Aluminum oxide is used as the insulation material for the inner sealed space, addressing the problem of significant heat loss due to the internal heat being transferred to the outer space via the end-support structures. Attached Figure Description

[0029] Figure 1 : A schematic diagram of the structure of the present invention;

[0030] Figure 2 : Schematic diagram of the test section structure of the present invention;

[0031] Figure 3 : Figure 2 Schematic diagram of the AA section structure;

[0032] Figure 4 : Figure 3 A schematic diagram of the BB structure in the image;

[0033] Figure 5 : Figure 3 A magnified schematic diagram of the local structure of G in the image;

[0034] Figure 6 : Schematic diagram of the separator tube structure of the present invention;

[0035] Figure 7 : A top view of the separator tube 1i of the present invention;

[0036] Figure 8 : Figure 7 Schematic diagram of the AA section structure;

[0037] Figure 9 : Figure 7 A magnified schematic diagram of the local structure B in the image;

[0038] Figure 10 : A schematic diagram of the structure of the clamping block 1j of the present invention;

[0039] Figure 11 : A schematic diagram of the structure of the lower end cap 1b of the present invention;

[0040] Figure 12 : A schematic diagram of the structure of the upper end cap 1r of the present invention;

[0041] Figure 13 : A schematic diagram of the structure of the airflow guide plate 1s of the present invention.

[0042] Explanation of icon numbers:

[0043] 1. Test section; 2. Outer sleeve; 3. Outer air outlet pipe; 4. Inner air outlet pipe; 5. Flange assembly; 6. Squirrel cage assembly; 7. Sealing head assembly; 8. Air nozzle assembly; 9. Air inlet pipe;

[0044] 1a. Positioning plate, 1b. Lower end cover, 1c. Mixing bottom plate, 1d. Lower clamping block of the partition tube, 1e. Lower sleeve, 1f. Mixing plate, 1g. Lower top plate, 1h. Lower insulation pad, 1i. Partition tube, 1j. Clamping block, 1k. Upper insulation pad, 1l. Upper top plate, 1m. Upper clamping block of the partition tube, 1n. Spring support frame, 1o. Upper sleeve, 1p. Spring, 1q. Inner layer upper end cover, 1r. Upper end cover, 1s. Airflow guide tube, 1t. Airflow guide plate. Detailed Implementation

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0046] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 invention according to the specific circumstances.

[0048] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0049] See also Figure 1As shown in the embodiment of this application, a dual-air-gap high-temperature material temperature-controlled irradiation device, from the air inlet direction to the air outlet direction, includes: an air inlet pipe 9, a test section 1, an outer sleeve 2, an outer air outlet pipe 3, an inner air outlet pipe 4, a squirrel cage assembly 6, a sealing head assembly 7, and an air nozzle assembly 8. The second end of the test section 1 is fixedly connected to the first end of the outer sleeve 2. The outer peripheral wall of the outer sleeve 2 is fixedly connected to the connecting assembly, which is a flange assembly 5. The air outlet of the test section 1 is fixedly connected to the first ends of the outer air outlet pipe 3 and the inner air outlet pipe 4, respectively. The outer air outlet pipe 3 and the inner air outlet pipe 4 are fixedly connected to the first end of the rat cage assembly 6, respectively. The second end of the rat cage assembly 6 is sealed to the sealing head assembly 7 and the air nozzle assembly 8, respectively. The first end of the air inlet pipe 9 is sealed and fixed at the port of the first end of the test section 1. The second end of the air inlet pipe 9 passes through the corresponding outlet of the flange assembly 5 and is welded and sealed at the outlet. After the second end of the air inlet pipe 9 passes through the flange assembly 5, it is welded and sealed to the first end of the air nozzle assembly. At least two air inlet pipes 9 are provided, preferably three air inlet pipes 9. The device further includes an airflow guide plate 1t and an airflow guide pipe 1s; the air intake pipe 9 includes a first air intake pipe and a second air intake pipe, the first air intake pipe is used to provide an air intake channel for the outer sealed space; the second air intake pipe includes at least two pipes; at least two second air intake pipes pass through the holes near the inner side of the lower end cover 1b and are sealed and welded to the airflow guide plate 1t, and the airflow guide plate 1t is fixedly sealed to one end of the airflow guide pipe 1s.

[0050] In this embodiment, the device introduces temperature-regulating gas through an inlet pipe. The gas exchanges heat with the high-temperature materials within the test section and is then discharged through the outer and inner outlet pipes. Because this application employs a zoned, independent gas regulation and temperature control method, i.e., a dual-gap design, it can more effectively reduce the irradiation temperature differences caused by varying particle fuel fission power in different regions, thereby achieving more precise temperature control. The second end of the cage assembly 6 is sealed to both the sealing head assembly 7 and the nozzle assembly 8. This design ensures that the gas inside the device does not leak, thus maintaining a stable test environment. Good sealing performance also helps prevent external impurities from entering the device, protecting the high-temperature materials and test section from contamination.

[0051] In one feasible implementation, the test section 1 includes at least: a partition tube 1i, an upper end cap 1r, a lower end cap 1b, an inner upper end cap 1q, an upper sleeve 1o, a lower sleeve 1e, and an inner upper end cap 1q. The upper sleeve 1o, the lower sleeve 1e, and the partition tube 1i are sequentially fixedly connected to form an outer sealed space; the partition tube 1i, the lower end cap 1b, and the inner upper end cap 1q are sequentially fixedly connected to form an inner sealed space. Three through holes are provided at corresponding positions on the partition tube 1i and the upper end cap 1r for the three air intake pipes 9 to pass through. This application forms an inner closed space and an outer sealed space through the fixed connection of the lower sleeve to the lower end cap and the partition tube, and the fixed connection of the upper sleeve to the partition tube and the upper end cap. This double-layer sealing design not only enhances the sealing performance of the test section but also effectively isolates the internal and external environments, preventing the exchange of heat and gas, thereby ensuring the accuracy and stability of the test. This application creates a large temperature gradient, allowing the inner sample to reach the required high temperature. A cooling device, such as a coolant, is installed on the outside of the test section. This application utilizes a two-layer air gap structure formed by separating tubes to achieve a stepped temperature decrease from the inside to the outside. With a single-layer air gap structure, when the sample reaches temperatures above 1000°C, the temperature of the sample-loading clamp will reach 800°C to 900°C. However, the temperature of the tube wall in contact with the coolant will drop sharply, but the temperature difference at the single-layer air gap will still reach 700°C or even 800°C, potentially posing a risk to operational safety. However, this application uses a double-layer air gap, which is equivalent to having two cooling zones. The temperature is first reduced to approximately 500°C to 600°C at the inner air gap, and then a second temperature decrease is achieved at the outer air gap, bringing it down to the same temperature as the coolant. The temperature difference between each cooling step is reduced. This structure can achieve the required high-temperature performance during high-temperature irradiation tests and also provides greater assurance for the reliability of the device.

[0052] Furthermore, regarding safety, the inner sealed space of this application is a high-temperature region, exceeding 1000℃. Therefore, high-temperature resistant materials such as molybdenum and aluminum oxide are required. However, considering the welding difficulty of these materials, stainless steel partition tubes are used for the envelope of the inner sealed space. These tubes have good high-temperature resistance and are easy to weld. The inner air gap achieves the first cooling gradient from the inside to the outside, keeping the stainless steel partition tubes within a temperature range suitable for long-term normal operation and ensuring their performance. The outer air gap provides a certain level of insulation while preventing the coolant from overheating, thus avoiding any impact on reactor operation safety.

[0053] In this embodiment, the test section 1 further includes a clamping block 1j; the clamping block 1j is provided with a sample loading hole and a thermocouple loading hole, wherein the sample loading hole is used to load the sample, and the thermocouple loading hole is used to load the inner high-temperature thermocouple to achieve sample temperature monitoring; the outer peripheral wall of the clamping block 1j is used to ensure the uniformity of the air gap in the circumferential direction, avoiding the problem of one end having a large air gap and the other end having a small air gap due to eccentricity. Specifically, the ribs are evenly distributed in the circumferential direction. In actual operation and installation, the shape and size of the sample loading hole can be adjusted according to experimental needs to achieve the purpose of adapting to the sample. Preferably, the clamping block 1j is made of molybdenum metal or other materials with similar high-temperature irradiation resistance, thermal conductivity, and self-heating performance. The clamping block 1j is used to provide the high temperature (above 1000℃) required by the sample, and the good thermal conductivity of the clamping block 1j material can also reduce the temperature difference of the sample at different positions.

[0054] In this embodiment, the test section 1 further includes an upper clamping block 1m and a lower clamping block 1d of the separator tube; the lower clamping block 1d is located at the first end port of the separator tube 1i, and the upper clamping block 1m is located at the second end port of the separator tube 1i. After the clamping block 1j is installed inside the separator tube 1i, it forms an annular gap, which serves as the heat-insulating air gap for the inner sealed space. The clamping block 1j is made of a material with good self-heating properties. Under neutron irradiation, it generates a high temperature through self-heating, which is then transferred to the sample loaded inside the clamping block 1j. Through the inner insulation layer, a high temperature can be achieved inside the clamping block 1j, while the inner wall of the separator tube 1i remains at a medium temperature. The gas composition of the inner sealed space can be adjusted through two air inlet channels, thereby adjusting the thermal conductivity of the insulation layer and controlling the internal temperature of the clamping block 1j. Furthermore, the design of the upper and lower clamping blocks of the separator tube in this application provides additional support and fixation for the separator tube, enhancing the structural stability of the entire test section. Meanwhile, by placing the clamps at the ports of the partition tubes, the heat distribution within the test section can be better managed. The clamps can act as bridges for heat conduction, transferring heat from one end of the partition tube to the other, or dissipating heat to the external environment through the heat dissipation structures on the clamps.

[0055] In this embodiment, the clamping block 1j and the upper clamping block 1m and lower clamping block 1d of the separator tube have different functions. Clamping block 1j is used for sample loading and thermocouple loading. The upper clamping block 1m and lower clamping block 1d of the separator tube are used for heat conduction, transferring heat from the inside to the outside. In addition, in this application, a material with good thermal conductivity is used to fill the empty areas of the outer sealing space. If it is not filled, the empty areas will be filled with gas, which is equivalent to forming a large gas insulation zone. This would prevent the temperature from being transferred to the coolant for cooling, resulting in an excessively high temperature in the outer sealing space.

[0056] Specifically, the partition tube 1i is provided with annular grooves, the main purpose of which is to form an insulating air gap in the outer sealing space. In this application, the intermittent distribution of these air gaps serves two purposes: firstly, for insulation, thereby raising the inner temperature; secondly, excessive heat can be quickly discharged to the coolant through the channels between the annular grooves where no air gap is provided. At least two annular grooves are provided, and they are symmetrically distributed about the axis of the partition tube 1i. This ensures that a portion of the partition tube 1i is in direct contact with the outer coolant, keeping the area on the outside of the partition tube 1i in contact with the coolant at a low temperature, thus protecting the pressure boundary of the device. Furthermore, the annular insulating air gap layer provides a partial temperature rise to achieve the high temperature of the inner sealing space, preventing heat from being rapidly discharged by the coolant. The width, spacing, and number of annular grooves can be adjusted according to the required test temperature. Eight thermocouple holes are opened on the partition tube 1i, distributed in the annular grooves. Thermocouples are installed in these holes for monitoring the temperature of the outer sealing space. The number of thermocouples can be adjusted according to the test requirements. The thermocouple wires pass through the outer vent pipe 3 and the squirrel cage assembly 6, and finally exit from the sealing head assembly 7, connecting to the monitoring and control system. The temperature of the separator tube can be monitored online via the outer thermocouple to ensure that the temperature of the separator tube does not exceed the long-term service temperature of the material. The temperature of the inner sealing space can also be estimated via the outer thermocouple, providing an indirect measurement method for inner layer temperature monitoring.

[0057] In this embodiment, making the elongated annular groove wider, with a wider arc, or increasing the number of annular grooves can achieve better heat preservation and higher irradiation temperatures. Conversely, making the annular grooves narrower, with shorter arcs, or reducing the number of annular grooves can achieve better heat conduction, ensuring that the pressure boundary of the device remains at a low temperature.

[0058] In one feasible implementation, the separator tube 1i is provided with a thermocouple hole at the annular groove for installing a thermocouple to monitor the temperature of the outer sealing space.

[0059] In one feasible implementation, the test section 1 further includes a mixing plate 1f, which is an inner enclosed space support component. The mixing plate 1f has multiple holes for uniformly mixing different gases input from the intake pipe 9. The mixing plate 1f is made of a material with high strength at high temperatures, such as molybdenum metal or other materials with high temperature resistance and strength.

[0060] In one feasible implementation, the test section 1 further includes a spring support frame 1n, which serves as a support for the inner enclosed space. A spring is installed at one end of the spring support frame 1n to provide space for high-temperature expansion within the inner layer, preventing damage to the sample due to expansion. Preferably, the spring support frame 1n is made of a material with high strength at high temperatures, such as molybdenum metal or other high-temperature resistant and high-strength materials.

[0061] In one feasible implementation, the device further includes an airflow guide plate 1t and an airflow guide tube 1s;

[0062] The air intake pipe 9 includes a first air intake pipe and a second air intake pipe, wherein the first air intake pipe is used to provide an air intake channel for the outer sealing space;

[0063] The second air intake pipe includes at least two pipes; at least two second air intake pipes pass through the lower end cover 1b and are sealed with the airflow guide plate 1t, and the airflow guide plate 1t is fixedly sealed with one end of the airflow guide pipe 1s.

[0064] In one feasible implementation, the device further includes a measurement and control system, wherein the high-temperature thermocouple is connected in sequence to the outer air outlet pipe 3, the rat cage assembly 6, the sealing head assembly 7, and the measurement and control system via wires.

[0065] In one feasible implementation, the test section further includes an upper insulation pad 1k and a lower insulation pad 1h, wherein the upper insulation pad 1k is disposed at the connection between the partition pipe 1i and the upper sleeve 1o, and the lower insulation pad 1h is disposed at the connection between the partition pipe 1i and the lower sleeve 1e.

[0066] In this embodiment, the test section 1 further includes a positioning plate 1a, a mixing bottom plate 1c, a lower top plate 1g, an upper top plate 1l, a spring 1p, an airflow guide pipe 1s, and an airflow guide plate 1t. The partition pipe 1i is internally equipped with, from bottom to top, a mixing bottom plate 1c, a mixing plate 1f, a lower top plate 1g, a lower insulation pad 1h, a clamping block 1j, an upper insulation pad 1k, and an upper top plate 1l. Those skilled in the art will readily understand that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0067] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A dual-air-gap high-temperature material temperature-controlled irradiation device, characterized in that, From the air inlet direction to the air outlet direction, it includes: air inlet pipe (9), test section (1), outer sleeve (2), outer air outlet pipe (3), inner air outlet pipe (4), rat cage assembly (6), sealing head assembly (7), and air nozzle assembly (8); The second end of the test section (1) is fixedly connected to the first end of the outer sleeve (2), and the outer peripheral wall of the outer sleeve (2) is fixedly connected to the connecting assembly. The air outlet of the test section (1) is fixedly connected to the first ends of the outer air outlet pipe (3) and the inner air outlet pipe (4), respectively. The outer air outlet pipe (3) and the inner air outlet pipe (4) are fixedly connected to the first end of the rat cage assembly (6); the second end of the rat cage assembly (6) is sealed to the sealing head assembly (7) and the air nozzle assembly (8). The first end of the air intake pipe (9) is sealed and fixed at the port of the first end of the test section (1), and the second end of the air intake pipe (9) passes through the outlet corresponding to the connecting assembly. The test section (1) includes at least: a partition tube (1i), an upper end cap (1r), a lower end cap (1b), an inner upper end cap (1q), an upper sleeve (1o), a lower sleeve (1e), and an inner upper end cap (1q). The upper sleeve (1o), the lower sleeve (1e), and the partition tube (1i) are sequentially fixedly connected to form an outer sealed space; The partition tube (1i), the lower end cap (1b), and the inner upper end cap (1q) are sequentially fixedly connected to form an inner sealed space; The test section (1) also includes a clamping block (1j). After the clamping block (1j) is installed into the partition tube (1i), it forms an annular gap. The annular gap is the heat-insulating air gap of the inner sealing space. The clamp (1j) is provided with a sample loading hole and a thermocouple loading hole. The sample loading hole is used to load the sample, and the thermocouple loading hole is used to load the inner high-temperature thermocouple to monitor the sample temperature. The outer peripheral wall of the clamping block (1j) is uniformly provided with processing ribs; The test section (1) also includes an upper clamping block (1m) and a lower clamping block (1d) of the separator pipe. The lower clamping block (1d) of the partition tube is located at the first end port of the partition tube (1i), and the upper clamping block (1m) of the partition tube is located at the second end port of the partition tube (1i). The partition tube (1i) is provided with annular grooves to form a heat-insulating air gap in the outer sealing space. At least two annular grooves are provided, and the annular grooves are symmetrically distributed about the axis of the partition tube (1i). The separator tube (1i) is provided with a thermocouple hole at the annular groove for installing a thermocouple to monitor the temperature of the outer sealing space; The test section (1) also includes a mixing plate (1f), which is an inner closed space support component. The mixing plate (1f) has multiple holes for mixing different gases input by the air inlet pipe (9) evenly.

2. The dual-air-gap high-temperature material temperature-controlled irradiation device according to claim 1, characterized in that, The test section (1) also includes a spring support frame (1n), which is a support for the inner closed space, and a spring is installed at one end of the spring support frame (1n).

3. The dual-air-gap high-temperature material temperature-controlled irradiation device according to claim 2, characterized in that, The device also includes an airflow guide plate (1t) and an airflow guide tube (1s). The air intake pipe (9) includes a first air intake pipe and a second air intake pipe, wherein the first air intake pipe is used to provide an air intake channel for the outer sealing space; The second air intake pipe includes at least two pipes; at least two second air intake pipes pass through the lower end cover (1b) and are sealed with the airflow guide plate (1t), and the airflow guide plate (1t) is fixedly sealed with one end of the airflow guide pipe (1s).

4. The dual-air-gap high-temperature material temperature-controlled irradiation device according to claim 1, characterized in that, The device further includes a measurement and control system, wherein the high-temperature thermocouple is connected in sequence to the outer air outlet pipe (3), the rat cage assembly (6), the sealing head assembly (7), and the measurement and control system via wires.

5. The dual-gap high-temperature material temperature-controlled irradiation device according to any one of claims 1-4, characterized in that, The test section also includes an upper insulation pad (1k) and a lower insulation pad (1h), wherein the upper insulation pad (1k) The lower heat insulation pad (1h) is located at the connection between the partition tube (1i) and the upper sleeve (1o).

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