Double-air-gap high-temperature material temperature control irradiation device

Abstract

The invention provides a double-air-gap high-temperature material temperature control irradiation device. The double-air-gap high-temperature material temperature control irradiation device comprises an air inlet pipe, a test section, an outer sleeve, an outer-layer air outlet pipe, an inner-layer air outlet pipe, a flange assembly, a mouse cage assembly, a sealing head assembly and an air nozzle assembly. The second end of the test section is fixedly connected with the first end of the outer sleeve, the peripheral wall of the outer sleeve is fixedly connected to the flange assembly, and an air outlet of the test section is fixedly connected with the first ends of the outer-layer air outlet pipe and the inner-layer air outlet pipe. The outer layer air outlet pipe and the inner layer air outlet pipe are fixedly connected with the first end of the mouse cage assembly. The second end of the mouse cage assembly is in sealed connection with the sealing head assembly and the air tap assembly. The air inlet pipe is arranged in a reserved air pipe channel in the test section, the first end of the air inlet pipe is hermetically fixed at the port of the first end of the test section, and the second end of the air inlet pipe penetrates through the corresponding penetrating opening of the flange assembly; the irradiation temperature can be greatly increased, it can be guaranteed that the temperature of the outer side of the device is kept within a safe range, and the high-temperature irradiation problem is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of research reactor material irradiation, and specifically relates to a double-air-gap high-temperature material temperature-controlled irradiation device. Background Art

[0002] In recent years, with the increasing requirements 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 the third generation of nuclear energy systems, such as high temperature gas-cooled reactors and gas-cooled fast reactors. In order to achieve higher safety, better economy, less nuclear waste emissions and sustainable development goals, the new generation of nuclear energy systems has put forward extremely high requirements for fuel and cladding materials, such as good thermal conductivity and physical properties, and the integrity of cladding and structural materials under extreme conditions. Overall, the operating temperature of the fourth generation nuclear reactor is much higher than that of the third generation. The core outlet design temperature of some new reactors is close to 1000℃, so it is crucial to study the performance of cladding and structural materials after neutron irradiation in high temperature environments for the development of new reactors. According to the structure of traditional temperature-controlled irradiation devices, there are the following contradictory problems in achieving the irradiation temperature target of more than 1000°C: on the one hand, in order to achieve a higher irradiation temperature, materials with high heat release should be selected in the irradiation device, such as molybdenum, rhenium, tungsten, etc. However, the above materials are often difficult to weld and cannot be sealed; on the other hand, when the temperature of the sample in the device reaches the irradiation temperature index, the interface temperature of the outer layer of the irradiation device in contact with 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 above-mentioned contradictions and shortcomings, the present application has newly designed the structure of the irradiation device to achieve the purpose of establishing a large heat transfer temperature difference in the irradiation device, so as to provide a temperature increase for the sample (reaching above 1000°C) while ensuring that the temperature outside the device is not too high, thereby ensuring the realization of high-temperature irradiation test indicators and the safety of the irradiation device.

[0004] In order to solve the above problems, the present application provides a double-gap high-temperature material temperature control irradiation device, which includes, from the air inlet direction to the air outlet direction: an air inlet pipe, a test section, an outer sleeve, an outer layer air outlet pipe, an inner layer 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 layer air outlet pipe and the inner layer air outlet pipe respectively;

[0006] The outer layer air outlet pipe and the inner layer air outlet pipe are respectively fixedly connected to the first end of the squirrel cage assembly; the second end of the squirrel cage assembly is respectively sealed and connected 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 at the first end of the test section, and the second end of the air inlet pipe passes through the corresponding through-hole of the connecting assembly. The device introduces temperature regulating gas through the air inlet pipe, and the gas exchanges heat with the high-temperature material in the test section, and then is discharged through the outer layer outlet pipe and the inner layer outlet pipe. Since the present application adopts an independent gas regulation and temperature control method for the inner and outer partitions, that is, a double air gap design, the temperature regulation range can be expanded and the temperature gradient can be increased, thereby meeting the high temperature requirements of the inner layer, thereby achieving more precise temperature control.

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

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

[0010] The separator tube, the lower end cover, and the inner upper end cover are fixedly connected in sequence to form an inner sealed space. The present application forms an inner closed space and an outer sealed space. The double-layer sealing design of the present application not only enhances the sealing performance of the test section, but also effectively isolates the internal and external environments to prevent the exchange of heat and gas, thereby ensuring the accuracy and stability of the test. In addition, the present application forms 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; the present application utilizes a two-layer air gap structure formed by a separator tube interval to achieve a step-by-step temperature drop from the inside to the outside. If the single-layer air gap structure, the sample reaches more than 1000°C, the temperature of the clamping block loaded with the sample will reach 800°C to 900°C, but 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, which may bring operational safety risks. However, the present application adopts a double-layer air gap, which is equivalent to having two cooling areas. The temperature is first reduced to about 500°C to 600°C at the inner air gap, and the second temperature reduction is achieved at the outer air gap, so that it drops to the same temperature as the coolant. The temperature difference of each cooling will be reduced. This structure can achieve high temperature indicators during high-temperature irradiation tests and is more reliable for the device.

[0011] In addition, in terms of safety, the inner sealed space of this application is a high-temperature area, that is, the temperature is above 1000°C, so high-temperature resistant materials such as molybdenum metal, aluminum oxide, etc. are required. However, considering the difficulty of welding these materials, the envelope environment of the inner sealed space uses a stainless steel separator tube, which has good high-temperature resistance and is easy to weld. The first temperature reduction gradient from the inside to the outside is achieved through the inner air gap, and the stainless steel separator tube can also be placed in a temperature range that can be used normally for a long time to ensure its performance. While the outer air gap achieves a certain insulation effect, it will not cause the coolant to overheat, which will not affect the safe operation of the reactor.

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

[0013] The clamp 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 layer high temperature thermocouple to monitor the sample temperature;

[0014] The outer peripheral wall of the clamp block is evenly arranged with processed ribs in the circumferential direction to ensure the uniformity of the air gap in the circumferential direction, thereby avoiding the problem of large air gap at one end and small air gap at the other end due to eccentricity.

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

[0016] The lower clamp block of the separator tube is arranged at the first end port of the separator tube, and the upper clamp block of the separator tube is arranged at the second end port of the separator tube. The design of the upper clamp block and the lower clamp block of the separator tube in the present application provides additional support and fixation for the separator tube, thereby enhancing the structural stability of the entire test section. In addition, by arranging the clamp block at the port of the separator tube, the heat distribution within the test section can be better managed. The clamp block can serve as a bridge for heat conduction, transferring heat from one end of the separator tube to the other end, or dissipating heat to the external environment through the heat dissipation structure on the clamp block.

[0017] Furthermore, the separator tube is provided with an annular groove for forming an intermittent insulating air gap. In the present application, the intermittent distribution structure of the air gap forms an insulating layer through the air gap to increase the temperature of the inner layer. On the other hand, the excessive heat can be quickly discharged to the coolant through the channels between the annular grooves where no air gap is set, thereby ensuring that the overall temperature of the separator 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 separation tube;

[0019] The separator tube is provided with a thermocouple hole at the annular groove for installing a thermocouple to monitor the temperature of the outer sealed space.

[0020] Furthermore, the test section also includes: a mixing plate, which is an inner closed space support member and has a plurality of holes thereon for evenly mixing the different gases inputted from the intake pipe.

[0021] Furthermore, the test section also includes: a spring support frame, which is a support member of the inner closed 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 inlet pipe comprises a first air inlet pipe and a second air inlet pipe, wherein the first air inlet pipe is used to provide an air inlet passage for the outer sealed space;

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

[0025] Furthermore, the device also includes: a measurement and control system, and the high-temperature thermocouple is sequentially connected to the outer layer air outlet pipe, the squirrel cage assembly, the sealing head assembly and the measurement and control system through a wire.

[0026] Furthermore, the test section also includes an upper insulation pad and a lower insulation pad, the upper insulation pad is arranged at the connection between the separation tube and the upper sleeve, and the lower insulation pad is arranged at the connection between the separation tube and the lower sleeve.

[0027] Beneficial Effects

[0028] The present invention designs a double-air-gap temperature-controlled irradiation device for high-temperature materials, which establishes a large heat transfer temperature difference in the device, which can not only achieve a large increase in irradiation temperature, but also ensure that the temperature outside the device remains in a safe range. The design of the present invention adopts a separator tube structure, so that the position where the outside of the device contacts the coolant is in a low-temperature range, ensuring the pressure boundary of the device, and forming an insulating air gap in the outer sealed space to provide temperature rise. The design of the present invention adopts independent structures of the inner sealed space and the outer sealed space to achieve independent temperature control inside and outside, and has stronger temperature control capabilities. The design of the present invention adopts molybdenum as a clamping block in the inner sealed space to achieve temperature increase and reduce the temperature difference of samples at different positions. The design of the present invention adopts aluminum oxide as the thermal insulation material of the inner sealed space to solve the problem of large-scale heat loss caused by the inner layer heat being guided to the outer space through the support structures at both ends. BRIEF DESCRIPTION OF THE DRAWINGS

[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 AA cross-sectional structure diagram in;

[0032] Figure 4 : Figure 3 Schematic diagram of BB structure in;

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

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

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

[0036] Figure 8 : Figure 7 AA cross-sectional structure diagram in;

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

[0038] Fig.10 : A schematic structural diagram of a clamping block 1j of the present invention;

[0039] Fig.11 : A schematic structural diagram of the lower end cover 1b of the present invention;

[0040] Fig.12 : A schematic diagram of the structure of the upper end cover 1r of the present invention;

[0041] Fig.13 : Schematic diagram of the structure of the airflow guide plate 1s of the present invention.

[0042] Description of Figure 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. Inlet pipe;

[0044] 1a. Positioning plate, 1b. Lower end cover, 1c. Mixing flow bottom plate, 1d. Lower clamping block of separator tube, 1e. Lower casing, 1f. Mixing flow plate, 1g. Lower top plate, 1h. Lower insulation pad, 1i. Separator tube, 1j. Clamping block, 1k. Upper insulation pad, 1l. Upper top plate, 1m. Upper clamping block of separator tube, 1n. Spring support frame, 1o. Upper casing, 1p. Spring, 1q. Inner upper end cover, 1r. Upper end cover, 1s. Airflow guide tube, 1t. Airflow guide plate. DETAILED DESCRIPTION

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0049] See also Figure 1As shown, according to an embodiment of the present application, a double 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 layer air outlet pipe 3, an inner layer 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, and 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 layer air outlet pipe 3 and the inner layer air outlet pipe 4, respectively; the outer layer air outlet pipe 3 and the inner layer air outlet pipe 4 are fixedly connected to the first end of the squirrel cage assembly 6, respectively; the second end of the squirrel cage assembly 6 is sealed and connected 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 at the first end of the test section 1, and the second end of the air inlet pipe 9 passes through the through-opening corresponding to the flange assembly 5, and is welded and sealed at the through-opening. After the second end of the air inlet pipe 9 passes through the flange assembly 5, it is welded and sealed with the first end of the air nozzle assembly; at least two air inlet pipes 9 are provided, and preferably, three air inlet pipes 9 are provided. The device also 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; at least two of the 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 the air inlet pipe, and the gas exchanges heat with the high-temperature material in the test section, and then is discharged through the outer layer outlet pipe and the inner layer outlet pipe. Since the present application adopts a gas regulation and temperature control method with independent partitions, that is, a double air gap design, it can more effectively reduce the irradiation temperature difference caused by the different fission powers of particle fuel in different areas, thereby achieving more accurate temperature control. The second end of the squirrel cage assembly 6 is sealed and connected to the sealing head assembly 7 and the gas nozzle assembly 8 respectively. This design ensures that the gas inside the device will not leak, thereby maintaining a stable test environment. Good sealing performance also helps to prevent external impurities from entering the interior of the device, protecting the high-temperature material and the test section from contamination.

[0051] Among them, in a feasible implementation, the test section 1 at least includes: a separator tube 1i, an upper end cover 1r, a lower end cover 1b, an inner upper end cover 1q, an upper sleeve 1o, a lower sleeve 1e, and an inner upper end cover 1q; the upper sleeve 1o, the lower sleeve 1e, and the separator tube 1i are fixedly connected in sequence to form an outer sealed space; the separator tube 1i, the lower end cover 1b, and the inner upper end cover 1q are fixedly connected in sequence to form an inner sealed space. Among them, three through holes are opened at corresponding positions of the separator tube 1i and the upper end cover 1r for the three air intake pipes 9 to pass through. The present application forms an inner closed space and an outer sealed space by fixing the lower sleeve with the lower end cover and the separator tube, and fixing the upper sleeve with the separator tube and the upper end cover. The double-layer sealing design of the present application not only enhances the sealing performance of the test section, but also effectively isolates the internal and external environments to prevent the exchange of heat and gas, thereby ensuring the accuracy and stability of the test. The present application forms a larger temperature gradient, so that when the inner layer sample reaches the required high temperature. A cooling device, such as a coolant, is provided on the outside of the test section; the present application uses a two-layer air gap structure formed by a separation tube to achieve a step-by-step temperature drop from the inside to the outside. If the structure of the single-layer air gap, the sample reaches above 1000°C, the temperature of the clamp loaded with the sample will reach 800°C to 900°C, but 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, so it may bring operational safety risks. However, the present application adopts a double-layer air gap, which is equivalent to having two cooling areas. The temperature is first reduced to about 500°C to 600°C at the inner air gap, and the second temperature drop is achieved at the outer air gap, so that it drops to the same temperature as the coolant, and the temperature difference will decrease each time the temperature is reduced. This structure can achieve high temperature indicators during high-temperature irradiation tests, and it is also more reliable for the reliability of the device.

[0052] In addition, in terms of safety, the inner sealed space of this application is a high-temperature area, that is, the temperature is above 1000°C, so high-temperature resistant materials such as molybdenum metal, aluminum oxide, etc. are required. However, considering the difficulty of welding these materials, the envelope environment of the inner sealed space uses a stainless steel separator tube, which has good high-temperature resistance and is easy to weld. The first temperature reduction gradient from the inside to the outside is achieved through the inner air gap, and the stainless steel separator tube can also be placed in a temperature range that can be used normally for a long time to ensure its performance. While the outer air gap achieves a certain insulation effect, it will not cause the coolant to overheat, which will not affect the safe operation of the reactor.

[0053] In this embodiment, the test section 1 also includes a clamp 1j; the clamp 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 layer high-temperature thermocouple to realize sample temperature monitoring; the outer peripheral wall of the clamp 1j is used to ensure the uniformity of the air gap in the circumferential direction to avoid the problem of eccentricity causing a large air gap at one end and a small air gap at the other end. Specifically, the ribs are evenly distributed in the circumferential direction. During the actual operation and installation process, the shape and size of the sample loading hole can be adjusted according to the experimental requirements to achieve the purpose of adapting the sample. Preferably, the above-mentioned clamp 1j is molybdenum metal or other materials with high temperature radiation resistance, thermal conductivity, and similar self-heating properties. The clamp 1j is used to provide the high temperature required for the sample (more than 1000°C), and the good thermal conductivity of the clamp 1j material can also reduce the temperature difference of samples in different positions.

[0054] In this embodiment, the test section 1 also includes an upper clamp block 1m of the separator tube and a lower clamp block 1d of the separator tube; the lower clamp block 1d of the separator tube is arranged at the first end port of the separator tube 1i, and the upper clamp block 1m of the separator tube is arranged at the second end port of the separator tube 1i. After the clamp block 1j is installed in the separator tube 1i, an annular gap is formed, and this annular gap is the heat-insulating air gap of the inner sealed space. The clamp block 1j is made of a material with good self-heating performance. Under the neutron irradiation environment, it forms a higher temperature by self-heating and is transferred to the sample loaded in the clamp block 1j. Through the inner insulation layer, it can be achieved that the inside of the clamp block 1j is high temperature and the inner wall of the separator tube 1i is 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 clamp block 1j. In addition, the design of the upper clamp block and the lower clamp block of the separator tube in the present application provides additional support and fixation for the separator tube, thereby enhancing the structural stability of the entire test section. At the same time, by placing the clamp at the end of the separator tube, the heat distribution in the test section can be better managed. The clamp can act as a bridge for heat conduction, transferring heat from one end of the separator tube to the other end, or dissipating heat to the external environment through the heat dissipation structure on the clamp.

[0055] In this embodiment, the clamp block 1j and the upper clamp block 1m of the separator tube and the lower clamp block 1d of the separator tube have different functions. The clamp block 1j is used for sample loading and thermocouple loading. The upper clamp block 1m of the separator tube and the lower clamp block 1d of the separator tube are used for heat conduction, which conducts heat from the inside to the outside. In addition, in this application, a material with good thermal conductivity is used to fill the empty area of ​​the outer sealed space. If it is not filled, the empty area is gas, which is equivalent to forming a large gas insulation area, which will cause the temperature to be unable to be conducted to the coolant for cooling, and will cause the temperature of the outer sealed space to be too high.

[0056] Specifically, the separator tube 1i is provided with an annular groove, the main purpose of which is to form an insulating air gap in the outer sealed space. In the present application, the air gap is intermittently distributed, on the one hand, for heat preservation to increase the temperature of the inner layer, and on the other hand, excessive heat can be quickly discharged to the coolant through the channel where the air gap is not provided between the annular grooves. At least two annular grooves are provided, and the annular grooves are symmetrically distributed about the axis of the separator tube 1i; on the one hand, it is ensured that part of the separator tube 1i is in direct contact with the outer coolant, so that the position where the outer side of the separator tube 1i contacts the coolant is in a low temperature range, ensuring the pressure boundary of the device; on the other hand, the annular insulating air gap layer provides partial temperature rise for achieving high temperature in the inner sealed space, avoiding heat from being quickly discharged by the coolant. The width spacing and number of the annular grooves can be adjusted according to the test temperature requirements. The separator tube 1i is provided with 8 thermocouple holes, which are distributed at the annular grooves. Thermocouples are installed in the holes to monitor the temperature of the outer sealed space. The number of thermocouples can be adjusted according to the test requirements. The thermocouple wire passes through the outer air outlet pipe 3 and the squirrel cage assembly 6, and finally passes through the sealing head assembly 7 and is connected to the measurement and control system. The outer thermocouple can be used to monitor the temperature of the separator tube online to ensure that the temperature of the separator tube does not exceed the long-term use temperature of the material. The outer thermocouple can also be used to infer the temperature of the inner sealed space, providing an indirect measurement method for inner temperature monitoring.

[0057] In this embodiment, the elongated annular groove is designed to be wider, the arc is wider or the number of annular grooves is increased, so that a better heat preservation effect can be achieved and a higher irradiation temperature can be achieved. The four annular grooves are designed to be narrower, the arc is shorter or the number of annular grooves is reduced, so that a better heat conduction effect can be achieved and the pressure boundary of the device is kept at a low temperature.

[0058] In a feasible implementation manner, a thermocouple hole is provided on the separation tube 1i at the annular groove for installing a thermocouple to monitor the temperature of the outer sealed space.

[0059] In a feasible implementation manner, the test section 1 further includes: a mixing plate 1f, which is an inner closed space support member and is provided with a plurality of 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 high-temperature resistant and high-strength materials.

[0060] In a feasible implementation, the test section 1 further includes: a spring support frame 1n, which is a support member of the inner closed space, and a spring is installed at one end of the spring support frame 1n to provide a high-temperature expansion space for the inner layer to avoid 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 a feasible implementation manner, the device further comprises an airflow guide plate 1t and an airflow guide tube 1s;

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

[0063] The second air intake pipes include at least two; at least two of the 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 a feasible implementation manner, the device further includes: a measurement and control system, wherein the high-temperature thermocouple is sequentially connected to the outer layer air outlet pipe 3, the squirrel cage assembly 6, the sealing head assembly 7 and the measurement and control system through a wire.

[0065] In a feasible embodiment, the test section also includes an upper insulation pad 1k and a lower insulation pad 1h. The upper insulation pad 1k is arranged at the connection between the separator tube 1i and the upper sleeve 1o, and the lower insulation pad 1h is arranged at the connection between the separator tube 1i and the lower sleeve 1e.

[0066] Among them, in the embodiment of the present application, the above-mentioned test section 1 also 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 tube 1s, and an airflow guide plate 1t. The interior of the separation tube 1i is loaded with 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 from bottom to top. It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0067] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A double air gap high temperature material temperature control irradiation device, characterized in that: From the air inlet direction to the air outlet direction, it 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, and the air outlet of the test section (1) is fixedly connected to the first ends of the outer layer air outlet pipe (3) and the inner layer air outlet pipe (4) respectively; The outer layer air outlet pipe (3) and the inner layer air outlet pipe (4) are respectively fixedly connected to the first end of the squirrel cage assembly (6); the second end of the squirrel cage assembly (6) is respectively sealed and connected to the sealing head assembly (7) and the air nozzle assembly (8); The first end of the air inlet pipe (9) is sealed and fixed at the port at the first end of the test section (1), and the second end of the air inlet pipe (9) passes through the corresponding through-port of the connecting assembly.

2. The double air gap high temperature material temperature control irradiation device according to claim 1 is characterized in that: The test section (1) at least comprises: a separation tube (1i), an upper end cover (1r), a lower end cover (1b), an inner upper end cover (1q), an upper casing (1o), a lower casing (1e), and an inner upper end cover (1q); The upper sleeve (1o), the lower sleeve (1e), and the separation tube (1i) are fixedly connected in sequence to form an outer sealed space; The separation tube (1i), the lower end cover (1b), and the inner layer upper end cover (1q) are fixedly connected in sequence to form an inner layer sealed space.

3. The double air gap high temperature material temperature control irradiation device according to claim 2 is characterized in that: The test section (1) also 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 layer high temperature thermocouple to monitor the sample temperature; The outer peripheral wall of the clamping block (1j) is evenly provided with processed ribs in the circumferential direction.

4. The double air gap high temperature material temperature control irradiation device according to claim 3 is characterized in that: The test section (1) also includes a partition tube upper clamping block (1m) and a partition tube lower clamping block (1d); The separator tube lower clamping block (1d) is arranged at the first end port of the separator tube (1i), and the separator tube upper clamping block (1m) is arranged at the second end port of the separator tube (1i).

5. The double air gap high temperature material temperature control irradiation device according to claim 3, characterized in that: The separation tube (1i) is provided with an annular groove for forming a heat-insulating air gap in the outer sealed space, at least two annular grooves are provided, and the annular grooves are symmetrically distributed with respect to the axis of the separation 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 sealed space.

6. The double-air-gap high-temperature material temperature-controlled irradiation device according to claim 4, characterized in that: The test section (1) further includes: a mixing plate (1f), the mixing plate (1f) being an inner closed space support, and the mixing plate (1f) being provided with a plurality of holes for uniformly mixing the different gases inputted from the intake pipe (9).

7. The double air gap high temperature material temperature control irradiation device according to claim 6, characterized in that: The test section (1) further comprises: a spring support frame (1n), the spring support frame (1n) being a support member of the inner closed space, and a spring being installed at one end of the spring support frame (1n).

8. The double-air-gap high-temperature material temperature-controlled irradiation device according to claim 7, characterized in that: The device also includes an airflow guide plate (1t) and an airflow guide tube (1s); The air intake pipe (9) comprises a first air intake pipe and a second air intake pipe, wherein the first air intake pipe is used to provide an air intake passage for the outer sealed space; The second air intake pipes include at least two; at least two of the second air intake pipes pass through the lower end cover (1b) and are sealed with the airflow guide plate (1t); the airflow guide plate (1t) is fixedly sealed with one end of the airflow guide pipe (1s).

9. The double air gap high temperature material temperature control irradiation device according to claim 5, characterized in that: The device further comprises: a measurement and control system, wherein the high-temperature thermocouple is sequentially connected to the outer layer air outlet pipe (3), the squirrel cage assembly (6), the sealing head assembly (7) and the measurement and control system via a wire.

10. The double air gap high temperature material temperature controlled irradiation device according to any one of claims 1 to 9, 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 arranged at the connection between the separation tube (1i) and the upper sleeve (1o), and the lower heat insulation pad (1h) is arranged at the connection between the separation tube (1i) and the lower sleeve (1e).

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