A material irradiation test device based on explosive gas

Abstract

The present application belongs to the technical field of neutron irradiation test, and particularly relates to a material irradiation test device based on explosive gas. In the present application, the upper end of the test section is connected with the lower end of the support pipe, the support pipe is hollow inside, and the gas inlet pipe and the gas outlet pipe are located inside the support pipe; the upper end of the support pipe is welded with the flange assembly, the upper end surface of the flange assembly is welded with the thermocouple sealing assembly, and the center of the upper end surface of the thermocouple sealing assembly is welded with the gas pipe joint; the lower end of the gas outlet pipe is connected with the test section, the upper end penetrates through the flange assembly and is connected with the thermocouple sealing assembly, the lower end of the gas inlet pipe is connected with the test section and is inserted into the test section, and the upper end penetrates through the flange assembly and is directly connected with the gas pipe joint. The present application is used to carry out the material irradiation test of releasing explosive gas in the reactor, to establish the safe and reliable irradiation test capability of the material sample in the reactor, to realize the control and safe operation of the material irradiation sample temperature, and to solve the problem of the irradiation in the reactor of the material releasing explosive gas.

Description

Technical Field

[0001] This invention belongs to the field of neutron irradiation testing technology, and specifically relates to a material irradiation testing device based on easily explosive gases. Background Technology

[0002] Before any nuclear material can be industrially applied, it must undergo irradiation testing to verify its performance in a radiation environment. Therefore, the results of irradiation experiments determine whether a nuclear material can be industrially applied. The primary equipment for conducting irradiation experiments is the irradiation device, and its performance determines the success of the experiment and the reliability of the post-irradiation test results. Due to the structural characteristics of the reactor, the neutron flux along the axial direction of the irradiation channel varies, leading to axial temperature inhomogeneity and consequently, temperature differences in the material samples within the irradiation device.

[0003] Currently, there is a growing demand for irradiation of new materials, especially for in-pile testing of materials that release explosive gases. Safety is paramount during irradiation testing. However, to ensure the successful completion of in-pile irradiation of materials while maintaining the safety of the irradiation test and the research reactor, it is necessary to improve the design of existing irradiation facilities and optimize in-pile testing methods to enable in-pile irradiation of materials that release explosive gases. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a material irradiation testing device based on the release of easily explosive gases, which is used to carry out material irradiation tests on materials that release easily explosive gases in a reactor, establish a safe and reliable in-reactor irradiation testing capability for material samples, realize the control of the temperature of the irradiated material samples and safe operation, and solve the problem of in-reactor irradiation of materials that release easily explosive gases.

[0005] The technical solution adopted in this invention is as follows:

[0006] An irradiation testing device for materials based on the release of explosive gases includes an inlet pipe, an outlet pipe, and a support pipe, as well as a test section, a flange assembly, a thermocouple sealing assembly, and a gas pipe connector. The upper end of the test section is connected to the lower end of the support pipe, and the support pipe is hollow inside. The inlet pipe and outlet pipe are located inside the support pipe. The upper end of the support pipe is welded to the flange assembly, and the thermocouple sealing assembly is welded to the upper end face of the flange assembly. The gas pipe connector is welded to the center of the upper end face of the thermocouple sealing assembly. The lower end of the outlet pipe is connected through the test section, and the upper end passes through the flange assembly and connects to the thermocouple sealing assembly. The lower end of the inlet pipe is connected to the test section and inserted into the test section, and the upper end passes through the flange assembly and connects directly to the gas pipe connector.

[0007] The test section includes a guide tube, a connecting tube, a top cover, a spring assembly, an irradiation tube, a capsule, a partition plate, a lower clamping block, a support block, a bottom cover, a neutron detector box, a support rod, an upper clamping block, a compensation block, an electric heating rod, a thermocouple, and an overload protector. The top cover and bottom cover are welded to the upper and lower ends of the irradiation tube, respectively. The other end of the top cover is fixedly connected to the guide tube through a connecting tube. The lower end of the exhaust pipe is directly welded to the top cover. A cavity is formed inside the irradiation tube. Inside the cavity, the spring assembly, upper clamping block, lower clamping block, and support block are stacked axially from top to bottom. A partition plate is provided between the lower and upper clamping blocks, and a partition plate is installed between the lower clamping block and the support block. Three through holes are axially opened in the upper clamping block, arranged in a circular pattern, and the capsule is installed in the holes. The overload protector is connected to the bottom of the capsule and installed in the circular hole of the lower clamping block. The neutron detector box is arranged at both ends of the upper clamping block, and a support rod is installed in the middle.

[0008] The capsule includes a capsule bottom cover, a capsule clamping block, a sample, a capsule protective tube, a fixing cover, and a capsule top cover. The capsule bottom cover and capsule top cover are welded to both ends of the capsule protective tube, forming a cavity inside the capsule protective tube. The capsule clamping block is installed inside the cavity and wraps the sample. A thermocouple is installed between the sample and the capsule clamping block. The thermocouple extends from the capsule top cover, passes through an outlet pipe and a thermocouple sealing assembly lead-out device, and is connected to the measurement and control system.

[0009] The overload protector includes a connecting short pipe, an overload housing, and a rupture diaphragm. The connecting short pipe is welded to the bottom of the overload housing and communicates with it. The rupture diaphragm is welded to the overload housing through a connecting ring, and the protruding part of the rupture diaphragm extends into the interior of the overload housing.

[0010] The upper clamping block has three electric heating rod holes arranged in a circle between the capsule holes. Electric heating rods are installed in the holes, and wires pass through the air outlet pipe and the thermocouple sealing assembly to connect to the measurement and control system. Three thermocouple holes are also arranged in a circle between the capsule holes. Thermocouple wires pass through the air outlet pipe and the thermocouple sealing assembly to connect to the measurement and control system. The upper clamping block also has an air inlet pipe hole and a compensation block, which are symmetrically distributed.

[0011] The capsule top cover has a guide tube, the capsule bottom cover has a vent hole, the capsule clamping block has an inner square and outer round structure, and a thermocouple mounting groove is machined on the inner side; the fixed cover has three ribs machined on the side, evenly distributed around the circumference; the two capsule clamping blocks are spliced ​​together to form a cylinder containing the sample, and the two ends are fixed with fixed covers to assemble into a cylindrical assembly, which is then installed as a whole in the capsule protective tube; the outer layer of the capsule protective tube has two sets of ribs machined axially, evenly distributed around the circumference.

[0012] After the capsule clamping block is installed into the capsule protection tube, the ribs on the side of the fixing cover contact the inner layer of the capsule protection tube, forming an annular gap layer A between the outer side of the capsule clamping block and the inner wall of the capsule protection tube; after the capsule is installed into the upper clamping block, the ribs on the outer side of the capsule protection tube contact the inner side of the axial hole of the upper clamping block, forming an annular gap layer B between the inner layer of the hole and the outer side of the capsule protection tube.

[0013] The outer layer of the upper clamping block is processed with ribs, which are evenly distributed in the circumference. After the upper clamping block is installed into the irradiation tube, the inner side of the irradiation tube and the outer layer of the upper clamping block form an annular gap layer C.

[0014] The air inlet pipe has two sections, each connected to a different air source; the sample can be block-shaped, rod-shaped, or circular; the capsule clamp has a thermocouple mounting groove; the capsule clamp is divided by a cylinder with an inner square and an outer circle.

[0015] The capsule is equipped with a thermocouple, which is led out from the guide tube on the top cover of the capsule. The overload protector is connected to the capsule. Inert gas is injected into the capsule and sealed at the outlet of the guide tube, forming a closed space inside the capsule.

[0016] The overload shell and the lower clamping block have unprocessed outer ribs. The outer wall of the overload shell is tightly fitted with the inner wall of the hole in the lower clamping block, and the outer wall of the lower clamping block is tightly fitted with the inside of the irradiation tube.

[0017] The thickness of the annular gap layer A is 0.2~0.5mm, the thickness of the annular gap layer B is 0.12~0.2mm, and the thickness of the annular gap layer C is 0.15~0.21mm; the annular gap layer A is filled with argon gas, and the annular gap layers B and C are filled with a mixture of argon and helium gas; the gas entering the irradiation device from the inlet pipe fills the annular gap layers B and C; the thickness of the bursting membrane is 0.05~0.35mm.

[0018] The number of thermocouples is no less than 6. The thermocouples installed inside the capsule measure the temperature of the sample online, and the thermocouples installed on the upper clamp measure the temperature of the upper clamp online.

[0019] The lower clamping block is made of a material with high thermal conductivity, and the overload shell is made of a material with high mechanical properties.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] (1) The present invention provides a material irradiation test device based on the release of easily explosive gases, which is used to carry out material irradiation tests on materials that release easily explosive gases in a reactor, establish a safe and reliable in-reactor irradiation test capability for material samples, realize the control of the temperature of the material irradiation sample and safe operation, and solve the problem of in-reactor irradiation of materials that release easily explosive gases.

[0022] (2) The present invention provides a material irradiation test device based on the release of easily explosive gases, which can realize the safe irradiation of materials that release easily explosive gases in the research reactor and has the ability to release easily explosive gases.

[0023] (3) The present invention provides a material irradiation test device based on the release of easily explosive gases. It adopts a modular design to solve the problem of safe irradiation of materials that release easily explosive gases in the research reactor and realize the macroscopic evaluation of the gas release performance of the materials.

[0024] (4) The present invention provides a material irradiation test device based on the release of easily explosive gases. It has a small number of parts, can simultaneously irradiate multiple materials and materials with different gas release properties, and has the conditions for adjusting the test temperature and online monitoring.

[0025] (5) The present invention provides a material irradiation test device based on the release of easily explosive gases, which can realize the irradiation of gas-releasing materials over a large range, and achieve the performance verification of multiple materials in the same device. Attached Figure Description

[0026] Figure 1 A schematic diagram of a material irradiation testing device based on the release of easily explosive gases provided by the present invention;

[0027] Figure 2 This is a schematic diagram of the test section structure;

[0028] Figure 3 This is a schematic diagram of the cross-sectional structure of test section II;

[0029] Figure 4 This is a schematic diagram of the upper layer clamping block structure of the test section;

[0030] Figure 5 This is a schematic diagram of the capsule structure;

[0031] Figure 6 This is a schematic diagram of the cross-sectional structure of capsule II-II;

[0032] Figure 7 This is a schematic diagram of the capsule's fixed end cap structure;

[0033] Figure 8 This is a schematic diagram of the capsule clip structure;

[0034] Figure 9 This is a schematic diagram of the capsule protective tube structure;

[0035] Figure 10 This is a schematic diagram of an overload protector.

[0036] In the picture:

[0037] 1. Test section; 2. Inlet pipe; 3. Outlet pipe; 4. Support pipe; 5. Flange assembly; 6. Thermocouple sealing assembly; 7. Pipe connector;

[0038] 10. Guide tube; 11. Connecting tube; 12. Top cover; 13. Spring assembly; 14. Irradiation tube; 15. Capsule; 16. Separator; 17. Lower clamping block; 18. Support block; 19. Bottom cover; 20. Neutron detector box; 21. Support rod; 22. Upper clamping block; 23. Compensation block; 24. Electric heating rod; 25. Thermocouple; 26. Overload protector;

[0039] 15a. Capsule bottom cover, 15b. Capsule clamping block, 15c. Sample, 15d. Capsule protection tube, 15e. Fixing cover, 15f. Capsule top cover, 15h. Connecting short tube, 15i. Overload shell, 15k. Bursting membrane. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an 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 based on the specific circumstances.

[0043] like Figures 1-10As shown, the present invention provides a material irradiation test device based on the release of easily explosive gases, including an inlet pipe 2, an outlet pipe 3 and a support pipe 4; it also includes a test section 1, a flange assembly 5, a thermocouple sealing assembly 6 and a gas pipe connector 7;

[0044] The upper end of the test section 1 is connected to the lower end of the support pipe 4. The support pipe 4 is hollow inside, and the air inlet pipe 2 and the air outlet pipe 3 are located inside the support pipe 4. The upper end of the support pipe 4 is welded to the flange assembly 5. Thermocouple sealing assembly 6 is welded to the upper end face of the flange assembly 5, and air pipe connector 7 is welded to the center of the upper end face of the thermocouple sealing assembly 6. The lower end of the air outlet pipe 3 is connected to the test section 1, and the upper end passes through the flange assembly 5 and connects to the thermocouple sealing assembly 6. The lower end of the air inlet pipe 2 is connected to the test section 1 and inserted into the test section 1. The upper end passes through the flange assembly 5 and connects directly to the air pipe connector 7. There are a total of 2 air inlet pipes 2.

[0045] The test section 1 includes a guide tube 10, a connecting tube 11, a top cover 12, a spring assembly 13, an irradiation tube 14, a capsule 15, a partition plate 16, a lower clamping block 17, a support block 18, a bottom cover 19, a neutron detector box 20, a support rod 21, an upper clamping block 22, a compensation block 23, an electric heating rod 24, a thermocouple 25, and an overload protector 26; the top cover 12 and the bottom cover 19 are respectively welded to the upper and lower ends of the irradiation tube 14, and the top cover 12... The other end is fixedly connected to the guide tube 10 via the connecting pipe 11, and the lower end of the exhaust pipe 3 is directly welded to the top cover 12; a cavity is formed inside the irradiation tube 14, and the spring assembly 13, the upper clamping block 22, the lower clamping block 17, and the support block 18 are axially stacked from top to bottom inside the cavity. A partition plate 16 is provided between the lower clamping block 17 and the upper clamping block 22, and a partition plate 16 is installed between the lower clamping block 17 and the support block 18. The partition plate 16 mainly... The key is to securely install the parts inside the upper clamping block 22 to prevent them from falling off or spilling out. The upper clamping block 22 has three through holes arranged circumferentially, and capsules 15 are installed in the holes. The overload protector 26 is connected to the bottom of the capsules 15 and installed in the circular hole of the lower clamping block 17. There are three sets of capsules 15, which can be loaded with different samples 15c or the same sample 15c, depending on the experimental requirements. An electric heating rod 24 and a thermocouple 25 are provided between two adjacent capsules 15. The electric heating rod 24 and the thermocouple 25 are connected to the external measurement and control system to realize online temperature measurement. At the same time, the overload protector 26 can be designed with different pressures according to different experimental requirements. After the electric heating rod 24 and the thermocouple 25 are led out from the gas outlet pipe 3, they pass through the thermocouple sealing assembly 6 and are sealed here. The sealing design pressure is consistent with the design pressure of the overload protector 26.

[0046] The capsule 15 includes a capsule bottom cover 15a, a capsule clamping block 15b, a capsule protection tube 15d, a fixing cover 15e, and a capsule top cover 15f. The capsule bottom cover 15a and the capsule top cover 15f are respectively welded to both ends of the capsule protection tube 15d, forming a cavity inside the capsule protection tube 15d. The capsule clamping block 15b is installed inside the cavity, and the capsule clamping block 15b encloses the sample 15c. A thermocouple 25 is installed between the sample 15c and the capsule clamping block 15b. The thermocouple 25 passes through the capsule top cover 15f, and through the vent pipe 3 and the thermocouple sealing assembly 6 to connect to the measurement and control system.

[0047] The overload protector 26 includes a connecting short pipe 15h, an overload housing 15i, and a rupture membrane 15k. The connecting short pipe 15h is welded to the bottom of the overload housing 15i and communicates with it. The rupture membrane 15k is welded to the overload housing 15i through a connecting ring, and the protruding part of the rupture membrane 15k extends into the interior of the overload housing 15i.

[0048] In this embodiment, the upper clamping block 22 has three holes for electric heating rods 24 arranged in a circle between the holes of the capsule 15. The electric heating rods 24 are installed in these holes, primarily for thermal compensation, and different power levels are set according to experimental requirements. Wires pass through the outlet pipe 3 and the thermocouple sealing assembly 6 to connect to the measurement and control system. Three thermocouple holes 25 are also located between the holes of the capsule 15, arranged in a circle. The thermocouple 25 wires pass through the outlet pipe 3 and the thermocouple sealing assembly 6 to connect to... The measurement and control system uses thermocouples 25 to directly measure the temperature of the clamping blocks online, ensuring that the temperature of the clamping blocks does not exceed the melting point of the materials. The upper clamping block 22 has two air inlet holes and a compensation block 23, which are symmetrically distributed. The neutron detector box 20 is arranged at both ends of the upper clamping block 22, with a support rod 21 installed in the middle. The lower clamping block 17 serves as a support component in the device. When needed, it can be used to install capsules 15, electric heating rods 24, and thermocouples 25, just like the upper clamping block 22, to enable the loading of more samples 15c.

[0049] In this embodiment, a guide tube is machined on the capsule top cover 15f, a vent hole is machined on the capsule bottom cover 15a, and the capsule clamping block 15b has an inner square and outer circle structure, with a thermocouple 25 mounting groove machined on its inner side. The capsule clamping block 15b is initially a metal cylinder, which is machined into an inner square and outer circle structure and then separated along the diagonal of the inner square hole to ensure that the irradiated sample 15c can be easily removed. The fixing cover 15e has three ribs machined on its side, evenly distributed around the circumference. The two capsule clamping blocks 15b are spliced ​​together to form a cylinder containing the sample, and the two ends are fixed with the fixing cover 15e to assemble a cylindrical assembly, which is then installed as a whole on the capsule protection tube 15d. The fixing cover 15e can ensure that the two capsule clamping blocks 15b will not separate. The outer layer of the capsule protection tube 15d has two sets of ribs machined axially, evenly distributed around the circumference.

[0050] In this embodiment, after the capsule clamp 15b is installed onto the capsule protection tube 15d, the ribs on the side of the fixing cover 15e contact the inner layer of the capsule protection tube 15d, forming an annular gap layer A between the outer side of the capsule clamp 15b and the inner wall of the capsule protection tube 15d. After the capsule 15 is installed onto the upper clamp 22, the ribs on the outer side of the capsule protection tube 15d contact the inner side of the axial hole of the upper clamp 22, forming an annular gap layer B between the inner layer of the hole and the outer side of the capsule protection tube 15d. After the capsule 15 is assembled, inert gas is filled into the annular gap layer A to form a heat insulation layer. Due to the self-heating properties of the material, a large temperature difference will be formed on both sides of the annular gap layer A, with a high temperature inside and a lower temperature outside. After the capsule 15 is installed onto the upper clamp 22, inert gas is filled into the annular gap layer B to form a heat insulation layer. Due to the self-heating properties of the material, a large temperature difference will be formed on both sides of the annular gap layer B, with a high temperature inside and a lower temperature outside.

[0051] In this embodiment, the outer layer of the upper clamping block 22 is processed with ribs, which are evenly distributed circumferentially. After the upper clamping block 22 is installed onto the irradiation tube 14, an annular gap layer C is formed between the inner side of the irradiation tube 14 and the outer layer of the upper clamping block 22. After the device is assembled, inert gas is filled into the annular gap layer C to form a heat insulation layer. Due to the self-heating properties of the material, a large temperature difference is formed on both sides of the annular gap layer C, with a high temperature inside and a low temperature outside. Based on the above three annular gap layers, four regions are formed, creating a large temperature gradient in the radial direction of the device, which satisfies the requirement of achieving high-temperature irradiation in a low-temperature environment.

[0052] In this embodiment, there are two air inlet pipes 2, which are connected to different air sources respectively; the structure of the sample 15c can be block-shaped, rod-shaped, or circular; the capsule clamping block 15b is machined with a thermocouple 25 mounting groove; the capsule clamping block 15b is divided by a cylinder with an inner square and an outer circle.

[0053] In this embodiment, a thermocouple 25 is installed inside the capsule 15. The thermocouple 25 is led out from the guide tube of the capsule top cover 15f. The overload protector 26 is connected to the capsule 15. Inert gas is injected into the capsule and sealed at the outlet of the guide tube, forming a closed space inside the capsule 15. When the pressure of the gas released by the material exceeds the limit of the overload protector 26, the burst membrane 15k will rupture and release high-pressure gas, ensuring the safety of the test device.

[0054] In this embodiment, the overload shell 15i and the lower clamping block 17 are not processed with ribs on their outer layers. The outer wall of the overload shell 15i is tightly fitted with the inner wall of the hole in the lower clamping block 17, and the outer wall of the lower clamping block 17 is tightly fitted with the inside of the irradiation tube 14. During in-core testing, since there are no gaps between the overload shell 15i and the lower clamping block 17, and between the outer wall of the lower clamping block 17 and the inside of the irradiation tube 14, no heat insulation layer is formed. The internal heat is rapidly dissipated, keeping the overload protector 26 at a low temperature for a long time and ensuring its performance.

[0055] In this embodiment, the thickness of the annular gap layer A is 0.2~0.5 mm, the thickness of the annular gap layer B is 0.12~0.2 mm, and the thickness of the annular gap layer C is 0.15~0.21 mm. Argon gas is filled into the annular gap layer A, while a mixture of argon and helium gas is filled into the annular gap layers B and C. The gas entering the irradiation device from the inlet pipe 2 fills the annular gap layers B and C. According to experimental requirements, the thicknesses of the annular gap layers A, B, and C can be flexibly adjusted to achieve a wide range of temperature control, from 200℃ to 900℃. The thickness of the bursting membrane 15k is 0.05~0.35 mm.

[0056] In this embodiment, the capsule clamping block 15b and the fixing cover 15e are made of molybdenum metal, the compensation block 23 is made of molybdenum alloy or aluminum alloy, and the electric heating rod 24 has a power of 0.5~2KW. During the experiment, different materials for the compensation block 23 and electric heating rods 24 with different powers can be selected according to requirements to achieve different temperature controls, and even different temperatures among the three capsules, so as to achieve multiple irradiation temperatures within the same device.

[0057] In this embodiment of the application, the number of thermocouples 25 is not less than 6. The thermocouples 25 installed in the capsule 15 measure the temperature of the sample 15c online, and the thermocouples installed in the upper clamping block 22 measure the temperature of the upper clamping block 22 online.

[0058] In this embodiment, the lower clamping block 17 is made of a material with high thermal conductivity, and the overload shell 15i is made of a material with high mechanical properties.

[0059] Example 1:

[0060] like Figure 5 As shown, the overload protector 26 includes a connecting short pipe 15h, an overload housing 15i, and a rupture membrane 15k. The connecting short pipe 15h is welded to the bottom of the overload housing 15i and communicates with it. The rupture membrane 15k is welded to the overload housing 15i via a connecting ring, and the protruding part of the rupture membrane 15k extends into the interior of the overload housing 15i. After the device is assembled, during the experiment, as the material gas is released, the pressure of the gas inside the capsule 15 and the overload protector 26 continuously increases. When the pressure exceeds the design pressure of the overload protector 26, the rupture membrane 15k ruptures, and the explosive gas enters the inert gas environment of the irradiation device, ensuring that the pressure inside the capsule 15 is limited to a low range. The design of the overload protector 26 is mainly based on the high temperature of the irradiated material and the performance of the released gas in the irradiation environment, ensuring that the overload protector 26 remains intact throughout the experiment and that the internal gas does not come into contact with air.

[0061] Example 2:

[0062] like Figure 3 , Figure 5 and Figure 10 As shown, for different materials, overload protectors 26 are designed according to the characteristics of the gas released by the material. Different materials are loaded in three capsules 15, and different overload protectors 26 are selected to connect to the capsules 15 to achieve simultaneous irradiation of materials with different gas release types.

[0063] Example 3:

[0064] like Figure 5 and Figure 10 As shown, under the premise of unknown irradiation material gas release performance, the design pressure gradient of overload protector 26 is made based on preliminary analysis, and the pressure range of the released gas is explored through experiments.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0066] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A material irradiation testing device based on the release of explosive gases, comprising an inlet pipe (2), an outlet pipe (3), and a support pipe (4), characterized in that: It also includes a test section (1), a flange assembly (5), a thermocouple sealing assembly (6), and a gas pipe connector (7); the upper end of the test section (1) is connected to the lower end of the support pipe (4), the support pipe (4) is hollow inside, and the air inlet pipe (2) and the air outlet pipe (3) are located inside the support pipe (4); the upper end of the support pipe (4) is welded to the flange assembly (5), the upper end face of the flange assembly (5) is welded to the thermocouple sealing assembly (6), and the center of the upper end face of the thermocouple sealing assembly (6) is welded to the gas pipe connector (7); the lower end of the air outlet pipe (3) is connected through the test section (1), the upper end passes through the flange assembly (5) and is connected to the thermocouple sealing assembly (6), the lower end of the air inlet pipe (2) is connected to the test section (1) and inserted into the test section (1), and the upper end passes through the flange assembly (5) and is directly connected to the gas pipe connector (7); The test section (1) includes a guide tube (10), a connecting tube (11), a top cover (12), a spring assembly (13), an irradiation tube (14), a capsule (15), a partition plate (16), a lower clamping block (17), a support block (18), a bottom cover (19), a neutron detector box (20), a support rod (21), an upper clamping block (22), a compensation block (23), an electric heating rod (24), a thermocouple (25), and an overload protector (26); the top cover (12) and the bottom cover (19) are respectively welded to the upper and lower ends of the irradiation tube (14), and the other end of the top cover (12) is fixedly connected to the guide tube (10) through the connecting tube (11), and the lower end of the exhaust pipe (3) is directly welded to the top cover (12); A cavity is formed inside the tube (14). Inside the cavity, spring assembly (13), upper clamping block (22), lower clamping block (17) and support block (18) are stacked axially from top to bottom. A partition plate (16) is provided between the lower clamping block (17) and the upper clamping block (22). A partition plate (16) is installed between the lower clamping block (17) and the support block (18). Three through holes are opened axially in the upper clamping block (22) in a circular arrangement, and capsules (15) are installed in the holes. The overload protector (26) is connected to the bottom of the capsule (15) and installed in the circular hole of the lower clamping block (17). The neutron detector box (20) is arranged at both ends of the upper clamping block (22), and a support rod (21) is installed in the middle. The capsule (15) includes a capsule bottom cover (15a), a capsule clamp (15b), a sample (15c), a capsule protection tube (15d), a fixing cover (15e), and a capsule top cover (15f); the capsule bottom cover (15a) and the capsule top cover (15f) are respectively welded to the two ends of the capsule protection tube (15d), forming a cavity inside the capsule protection tube (15d), and the capsule clamp (15b) is installed inside the cavity, the capsule clamp (15b) wraps the sample (15c); a thermocouple (25) is installed between the sample (15c) and the capsule clamp (15b), the thermocouple (25) passes out from the capsule top cover (15f), and passes through the vent pipe (3) and the thermocouple sealing assembly (6) lead-out device to connect to the measurement and control system; The overload protector (26) includes a connecting short pipe (15h), an overload housing (15i), and a rupture membrane (15k). The connecting short pipe (15h) is welded to the bottom of the overload housing (15i) and communicates with it. The rupture membrane (15k) is welded to the overload housing (15i) through a connecting ring. The protruding part of the rupture membrane (15k) extends into the interior of the overload housing (15i).

2. The material irradiation testing device based on the release of easily explosive gases according to claim 1, characterized in that: The upper clamping block (22) has three holes for electric heating rods (24) arranged in a circle between the holes of the capsule (15). The electric heating rods (24) are installed in the holes, and the wires pass through the air outlet pipe (3) and the thermocouple sealing assembly (6) lead-out device to connect to the measurement and control system. There are three holes for thermocouples (25) arranged in a circle between the holes of the capsule (15). The thermocouple (25) wires pass through the air outlet pipe (3) and the thermocouple sealing assembly (6) lead-out device to connect to the measurement and control system. The upper clamping block (22) has holes for air inlet pipes (2) and compensation blocks (23) symmetrically distributed.

3. The material irradiation testing device based on the release of easily explosive gases according to claim 1, characterized in that: A guide tube is machined on the top cover (15f) of the capsule, and a vent hole is machined on the bottom cover (15a) of the capsule. The capsule clamping block (15b) has an inner square and outer circle structure, and a thermocouple (25) mounting groove is machined on the inner side. Three ribs are machined on the side of the fixing cover (15e), which are evenly distributed around the circumference. The two capsule clamping blocks (15b) are spliced ​​together to form a cylinder containing the sample inside. The two ends are fixed with the fixing cover (15e) and assembled into a cylindrical assembly, which is installed as a whole in the capsule protection tube (15d). The outer layer of the capsule protection tube (15d) has two sets of ribs machined axially, which are evenly distributed around the circumference.

4. The material irradiation testing device based on the release of easily explosive gases according to claim 1, characterized in that: After the capsule clamp (15b) is installed onto the capsule protection tube (15d), the ribs on the side of the fixing cover (15e) contact the inner layer of the capsule protection tube (15d), forming an annular gap layer A between the outer side of the capsule clamp (15b) and the inner wall of the capsule protection tube (15d); after the capsule (15) is installed onto the upper clamp (22), the ribs on the outer side of the capsule protection tube (15d) contact the inner side of the axial hole of the upper clamp (22), forming an annular gap layer B between the inner layer of the hole and the outer side of the capsule protection tube (15d).

5. The material irradiation testing device based on the release of easily explosive gases according to claim 4, characterized in that: The upper clamping block (22) has ribs on its outer layer, which are evenly distributed in the circumference. After the upper clamping block (22) is installed on the irradiation tube (14), the inner side of the irradiation tube (14) and the outer layer of the upper clamping block (22) form an annular gap layer C.

6. The material irradiation testing device based on the release of easily explosive gases according to claim 1, characterized in that: The air inlet pipe (2) has two pipes, which are connected to different air sources respectively; the sample (15c) has a block, rod or disc structure; the capsule clamp (15b) is machined with a thermocouple (25) mounting groove; the capsule clamp (15b) is divided by a cylinder with an inner square and an outer circle.

7. The material irradiation testing device based on the release of easily explosive gases according to claim 1, characterized in that: Thermocouple (25) is installed inside the capsule (15). Thermocouple (25) is led out from the guide tube of the capsule top cover (15f). Overload protector (26) is connected to capsule (15). Inert gas is injected into capsule (15) and sealed at the outlet of guide tube, forming a closed space inside capsule (15).

8. The material irradiation testing device based on the release of easily explosive gases according to claim 1, characterized in that: The overload housing (15i) and the lower clamping block (17) have unprocessed outer ribs. The outer wall of the overload housing (15i) is closely fitted with the inner wall of the hole of the lower clamping block (17), and the outer wall of the lower clamping block (17) is closely fitted with the inside of the irradiation tube (14).

9. A material irradiation testing device based on the release of easily explosive gases according to claim 5, characterized in that: The thickness of the annular gap layer A is 0.2~0.5mm, the thickness of the annular gap layer B is 0.12~0.2mm, and the thickness of the annular gap layer C is 0.15~0.21mm; the annular gap layer A is filled with argon gas, and the annular gap layers B and C are filled with a mixture of argon and helium gas; the gas entering the irradiation device from the inlet pipe (2) fills the annular gap layers B and C; the thickness of the bursting membrane (15k) is 0.05~0.35mm.

10. A material irradiation testing device based on the release of easily explosive gases according to claim 6, characterized in that: The number of thermocouples (25) is not less than 6. The thermocouples (25) installed in the capsule (15) measure the temperature of the sample (15c) online, and the thermocouples installed in the upper clamp (22) measure the temperature of the upper clamp (22) online.

11. A material irradiation testing device based on the release of easily explosive gases according to claim 5, characterized in that: The material of the lower clamping block (17) is a material with high thermal conductivity, and the material of the overload shell (15i) is a material with high mechanical properties.

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