A heat-insulated and cooled high-temperature irradiation device

Abstract

The application relates to the technical field of high-temperature irradiation tests, and provides a heat-insulation cooling type high-temperature irradiation device, which comprises a closed outer cylinder, a split pipe with open two ends, one end of the split pipe being fixedly connected with one end of the outer cylinder and forming a water inlet flow channel between the outer cylinder and the split pipe, and a high-temperature sealing element, one end of the high-temperature sealing element being provided with an air inlet pipe and the other end being provided with an air outlet pipe so as to fill inert gas for heat preservation into the inside; the high-temperature sealing element is internally provided with a clamping block for mounting a test sample; a water outlet flow channel is formed between the high-temperature sealing element and the split pipe, and the outer cylinder is provided with a water inlet pipe communicating with the water inlet flow channel and a water outlet pipe communicating with the water outlet flow channel at one end connected with the split pipe. The application can guarantee the high-temperature irradiation test indexes in the high-temperature sealing element, continuously cool the high-temperature sealing element, and guarantee the mechanical properties of the high-temperature sealing element.

Description

Technical Field

[0001] This invention relates to the field of high-temperature irradiation testing technology, and more specifically, to a heat-insulated and cooled high-temperature irradiation device. Background Technology

[0002] In the development of nuclear materials, conducting in-reactor irradiation tests to obtain their irradiation performance is an essential step. One of the most critical indicators in irradiation testing is the irradiation temperature, which needs to simulate the actual service temperature as closely as possible. For the fourth-generation nuclear reactors currently under development, whose operating temperatures are much higher than those of the third generation, it is essential to research irradiation devices suitable for high-temperature environments.

[0003] The biggest challenge in achieving the target high-temperature irradiation temperature in traditional temperature-controlled irradiation devices is the lack of materials that are suitable for high temperatures, possess good weldability, and are suitable for in-pile use. Furthermore, the performance of commonly used stainless steel at high temperatures fails to meet the requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a heat-insulated and cooled high-temperature irradiation device to overcome the above-mentioned defects of the prior art.

[0005] This invention is achieved through the following technical solution: A heat-insulated and cooled high-temperature irradiation device, comprising: The outer cylinder is closed at both ends. The diversion pipe is open at both ends, with one end fixedly connected to one end of the outer cylinder, forming an inlet channel between the outer cylinder and the diversion pipe; The high-temperature sealing component has an air inlet pipe at one end and an air outlet pipe at the other end to fill the interior with inert gas for heat preservation; the high-temperature sealing component has a clamping block for installing test samples inside; a water outlet channel is formed between the high-temperature sealing component and the diversion pipe, and the outer cylinder has an inlet pipe that connects to the water inlet channel and an outlet pipe that connects to the water outlet channel at one end connected to the diversion pipe.

[0006] Furthermore, the outer cylinder includes a lower end cap, a central sealing cap, a positioning flange, a diversion flange cylinder with flanges at both ends, and an outer sleeve with open ends. The lower end cap is welded to one end of the outer sleeve, the positioning flange is used to connect to the stack top cover and is welded to the other end of the outer sleeve, the diversion flange cylinder is welded to the positioning flange, the flange at the end of the diversion flange cylinder away from the positioning flange is welded to the central sealing cap, the water outlet pipe and the diversion pipe are both welded to the central sealing cap, and the water inlet pipe is welded to the side wall of the diversion flange cylinder.

[0007] Furthermore, the high-temperature sealing element has a cylindrical structure, and its cylindrical wall is provided with several cooling through holes extending through both ends along the circumference. Two adjacent cooling through holes serve as the inlet channel and the outlet channel of the cooling medium, respectively. At one end of the high-temperature sealing element, in addition to the inlet channel and the outlet channel, a confluence groove connecting the two is provided at every two adjacent cooling through holes. At the other end of the high-temperature sealing element, a confluence groove connecting the two is also provided at every two adjacent cooling through holes, and the confluence grooves at both ends of the high-temperature sealing element are staggered. A flow channel cover is welded to the return channel to seal it. After the cooling medium enters from the inlet channel, it flows sequentially through the adjacent cooling through holes and then flows out from the outlet channel.

[0008] Furthermore, the inner wall of the high-temperature seal is provided with a ceramic coating.

[0009] Furthermore, the high-temperature sealing component includes a cooling cylinder, an inner upper cover plate, and an inner lower cover plate. The inner upper cover plate is welded to one end of the cooling cylinder, and the inner lower cover plate is welded to the other end of the cooling cylinder.

[0010] Furthermore, one end of the air outlet pipe is welded to the inner upper cover plate, and a support frame for supporting the inner lower cover plate is fixed inside the outer cylinder.

[0011] Furthermore, a spring positioning frame and a spring are provided between the end of the high-temperature sealing component near the outlet pipe and the clamping block. One end of the spring positioning frame serves as a support for the clamping block, and the other end of the spring positioning frame is fitted with a spring, which abuts against the end of the high-temperature sealing component.

[0012] Furthermore, a first heat insulation pad is provided between the spring positioning frame and the clamping block.

[0013] Furthermore, a mixing bottom plate is provided between the end of the high-temperature seal near the air inlet pipe and the clamping block. The mixing bottom plate includes a plate body and support ribs on both sides of the plate body. The plate body is provided with a plurality of mixing holes. The support rib on one side of the plate body abuts against the end of the high-temperature seal, and the support rib on the other side of the plate body abuts against the clamping block.

[0014] Furthermore, a second heat insulation pad is provided between the mixing bottom plate and the clamping block.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. In this invention, the high-temperature sealing component achieves high temperature through the heat release of the test sample, while inert gas is filled inside the high-temperature sealing component for insulation, ensuring the high-temperature irradiation test indicators; at the same time, an inlet channel is formed between the outer cylinder and the distribution pipe, and an outlet channel is formed between the high-temperature sealing component and the distribution pipe. The outer cylinder has an inlet pipe connecting to the inlet channel and an outlet pipe connecting to the outlet channel at one end connected to the distribution pipe; in this way, a split structure is formed, that is, the coolant enters the inlet channel from the inlet pipe, flows to the end of the outer cylinder away from the inlet pipe and then turns back into the outlet channel, and finally flows out from the outlet pipe. The coolant continuously cools the high-temperature sealing component when it is in the outlet channel, ensuring the mechanical properties of the high-temperature sealing component.

[0016] 2. In this invention, the cooling medium enters through the cooling through holes in the cylinder wall of the high-temperature sealing component and the confluence grooves at both ends, so that after flowing through the inlet channel, it flows through the adjacent cooling through holes in sequence and then flows out through the outlet channel, forming a "winding" serpentine cooling channel. The high-temperature sealing component is circulated and cooled by cooling gas or liquid, which further reduces the temperature of the high-temperature sealing component and ensures its mechanical properties.

[0017] 3. In this invention, the ceramic coating on the inner wall of the high-temperature sealing component reduces the transfer of heat to the outside.

[0018] 4. In this invention, the provision of the first heat insulation pad and the second heat insulation pad can reduce the transfer of heat to the inner upper cover plate and the inner lower cover plate at both ends; in addition, the heat insulation pad (i.e. the first heat insulation pad and the second heat insulation pad), the ceramic coating, the above-mentioned diversion structure and the above-mentioned serpentine cooling channel constitute a quadruple cooling and heat insulation structure, which on the one hand reduces the transfer of heat to the outside of the high-temperature sealing component, and on the other hand realizes the circulating cooling of the high-temperature sealing component. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of a heat-insulated and cooled high-temperature irradiation device provided by the present invention; Figure 2 A schematic diagram of a high-temperature sealing component and its internal structure; Figure 3 for Figure 2 A-direction view; Figure 4 This is a cross-sectional view of the cooling cylinder. Figure 5 This is a schematic diagram of the cooling cylinder structure; Figure 6 This is a structural diagram of the cooling cylinder (with hidden flow channel cover). Figure 7 for Figure 4 The right view; Figure 8 for Figure 4 The left view; Figure 9This is an unfolded sectional view of the cooling cylinder. Reference numerals: 1-Diverter flange cylinder, 2-Inlet pipe, 3-Positioning flange, 4-Outer sleeve, 5-Lower end cap, 6-Support frame, 7-Inlet pipe, 8-High temperature seal, 9-Cooling pipe, 10-Diverter pipe, 11-Central sealing cover, 12-Outlet pipe, 13-Inner upper cover plate, 14-Cooling cylinder, 1401-Cooling through hole, 1402-Merging groove, 15-Mixing bottom plate, 16-Inner lower cover plate, 17-Second heat insulation pad, 18-Clamping block cover plate, 19-Clamping block, 20-Spring positioning frame, 21-Spring, 22-Second heat insulation pad, 23-Flow channel cover plate, 24-Ceramic coating. Detailed Implementation

[0020] refer to Figure 1 A heat-insulated and cooled high-temperature irradiation device includes a high-temperature sealing element 8, an outer cylinder, and a diversion pipe 10. The high-temperature sealing element 8 has a clamping block 19 for mounting test samples inside. The structure of the clamping block 19 is not limited and can adopt existing structures in the art, such as the structure provided by the prior art with publication number "CN119943466A". The clamping block 19 has several sample loading holes extending through both ends. The test sample is placed in the sample loading holes. A clamping block cover plate 18 is placed on the clamping block 19. Several ribs are provided on the outer side of the clamping block 19 to form an air gap with the high-temperature sealing element 8. One end of the high-temperature sealing element 8 has an inlet pipe 7, and the other end has an outlet pipe 12, to fill the interior with inert gas for insulation, ensuring the high-temperature irradiation test parameters. It is easy to understand that after the inert gas is filled, the gas path is sealed.

[0021] The outer cylinder is closed at both ends, while the distribution pipe 10 is open at both ends. One end of the distribution pipe 10 is fixedly connected to one end of the outer cylinder (preferably welded), forming an inlet channel between the outer cylinder and the distribution pipe 10. An outlet channel is formed between the high-temperature seal 8 and the distribution pipe 10. The outer cylinder has an inlet pipe 2 connecting to the inlet channel and an outlet pipe connecting to the outlet channel at the end connected to the distribution pipe 10. This creates a split-flow structure: the coolant enters the inlet channel from the inlet pipe 2, flows to the end of the outer cylinder away from the inlet pipe 2, then turns back into the outlet channel, and finally flows out from the outlet pipe. The coolant continuously cools the high-temperature seal 8 (made of stainless steel) while flowing through the outlet channel, ensuring the mechanical properties of the high-temperature seal 8. In practical applications, the coolant is repeatedly circulated through an external cooling loop.

[0022] As an alternative, in this embodiment, the outer cylinder consists of a lower end cap 5, a central sealing cap 11, a positioning flange 3, a diversion flange cylinder 1 with flanges at both ends, and an outer sleeve 4 with open ends. Specifically, the lower end cap 5 is welded to one end of the outer sleeve 4, the positioning flange 3 is welded to the other end of the outer sleeve 4, the diversion flange cylinder 1 is welded to the positioning flange 3, the flange at the end of the diversion flange cylinder 1 away from the positioning flange 3 is welded to the central sealing cap 11, the outlet pipe and the diversion pipe 10 are both welded to the central sealing cap 11, and the inlet pipe 2 is welded to the side wall of the diversion flange cylinder 1. In practical applications, the positioning flange 3 is fastened to the reactor top cover with bolts, forming a boundary that separates the research reactor coolant from the device, achieving a relatively sealed structure inside the device, while the outside of the device is the research reactor coolant, which can remove heat from the inside of the device. In other embodiments, the outer cylinder may of course be composed of other structures, such as a cylinder with one end open and a cover plate welded to the open end, with a water outlet pipe welded to the cover plate, a water inlet pipe 2 welded to the side wall, and a flange connecting to the top cover.

[0023] refer to Figures 4-9 The high-temperature seal 8 has a cylindrical structure with several cooling through holes 1401 extending through both ends along the circumference of its cylindrical wall. Two adjacent cooling through holes 1401 serve as the inlet and outlet channels for the cooling medium, respectively. At one end of the high-temperature seal 8, in addition to the inlet and outlet channels, a confluence groove 1402 connecting the two is provided at every two adjacent cooling through holes 1401. At the other end of the high-temperature seal 8, a confluence groove 1402 connecting the two is also provided at every two adjacent cooling through holes 1401, and the confluence grooves 1402 at both ends of the high-temperature seal 8 are staggered. A flow channel cover 23 is welded to the return channel to seal it. In practical applications, after entering through the inlet channel, the cooling medium flows back and forth between adjacent cooling through-holes 1401, finally exiting through the outlet channel, forming a "winding" serpentine cooling channel. This circulating cooling of the high-temperature seal 8 via cooling gas or liquid further reduces its temperature and ensures its mechanical properties. It is worth noting that the cooling medium entering through the cooling through-holes 1401 can be either liquid or gas. For example, if gas is used, cooling gas pipes 9 are connected to the inlet and outlet channels of the cooling medium. In practical applications, an external circulating cooling loop is added to achieve the recycling of the cooling medium.

[0024] refer to Figure 2 and Figure 3As an alternative, in this embodiment, the high-temperature seal 8 includes a cooling cylinder 14, an inner upper cover plate 13, and an inner lower cover plate 16. The inner upper cover plate 13 is welded to one end of the cooling cylinder 14, and the inner lower cover plate 16 is welded to the other end of the cooling cylinder 14. Based on this, it is easy to understand that the aforementioned cooling through-hole 1401 is provided on the cylinder wall of the cooling cylinder 14. In the gas embodiment, the high-temperature seal 8 can, of course, be composed of other structures, such as two semi-cylindrical bodies welded together; two cylinders with one open end welded together; or a cylinder with one open end welded together with a cover plate.

[0025] Based on the above, one end of the outlet pipe 12 is welded to the inner upper cover plate 13, and a support frame 6 for supporting the inner lower cover plate 16 is fixed (preferably welded) inside the outer sleeve 4. The inlet pipe 7 is welded to the inner lower cover plate 16, and the inlet pipe 7 exits the device from the outside of the high-temperature seal 8 where coolant is flushed, so that the inlet pipe 7 can be cooled and is in the medium-low temperature range. In practical applications, two inlet pipes 7 can be provided to facilitate the filling of inert gases with different compositions.

[0026] Furthermore, a mixing base plate 15 is provided between the end of the high-temperature seal 8 near the air inlet pipe 7 and the clamping block 19. The mixing base plate 15 includes a plate body and supporting ribs on both sides of the plate body. The plate body is provided with several mixing holes (i.e., the plate body is a porous plate structure with many small holes). After inert gases of different compositions are filled in, the gases are dispersed into multiple small airflows when passing through the mixing holes, thereby achieving more uniform mixing and achieving the required heat preservation effect. The supporting rib on one side of the plate body abuts against the end of the high-temperature seal 8, and the supporting rib on the other side of the plate body abuts against the clamping block 19, that is, the supporting ribs serve as support for one end of the clamping block 19.

[0027] A spring positioning bracket 20 and a spring 21 are provided between the end of the high-temperature seal 8 near the outlet pipe 12 and the clamping block 19. One end of the spring positioning bracket 20 serves as a support for the clamping block 19. With the mixing base plate 15 in place, the clamping block 19 is supported by both the mixing base plate 15 and the spring positioning bracket 20. The other end of the spring positioning bracket 20 is fitted with the spring 21, which abuts against the end of the high-temperature seal 8. It is worth noting that the spring 21 provides space for the sample to expand at high temperatures, preventing damage to the sample due to expansion. The spring 21 support bracket 61n is made of a material with high strength at high temperatures, such as molybdenum metal or other high-temperature resistant and high-strength materials.

[0028] refer to Figure 4The inner wall of the high-temperature seal 8 is coated with a ceramic coating 24. The advantages of the ceramic coating 24 are its high melting point and low thermal conductivity, which reduces the transfer of some of the high-temperature heat generated at the center to the side wall of the high-temperature seal 8, thus lowering the inner temperature of the high-temperature seal 8 by approximately 100 degrees Celsius. The material of the ceramic coating 24 is not specifically limited; for example, alumina ceramic, zirconia ceramic, and silicon carbide ceramic are all acceptable. It is easy to understand that, given that the high-temperature seal 8 consists of a cooling cylinder 14, an inner upper cover plate 13, and an inner lower cover plate 16, the ceramic coating 24 is located on the inner wall of the cooling cylinder 14.

[0029] Refer again Figure 2 A first heat insulation pad 22 is provided between the spring positioning bracket 20 and the clamping block 19 to reduce heat transfer to the inner upper cover plate 13; a second heat insulation pad 17 is provided between the mixing bottom plate 15 and the clamping block 19 to reduce heat transfer to the inner lower cover plate 16. In addition, the heat insulation pads (i.e., the first heat insulation pad 22 and the second heat insulation pad 17), the ceramic coating 24, the above-mentioned flow diversion structure, and the above-mentioned serpentine cooling channel constitute a quadruple cooling and heat insulation structure, which on the one hand reduces heat transfer to the outside of the high-temperature sealing component 8, and on the other hand achieves circulating cooling of the high-temperature sealing component 8.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat-insulated and cooled high-temperature irradiation device, characterized in that, include: The outer cylinder is closed at both ends. The diversion pipe is open at both ends, with one end fixedly connected to one end of the outer cylinder, forming an inlet channel between the outer cylinder and the diversion pipe; The system includes a high-temperature sealing element, with an inlet pipe at one end and an outlet pipe at the other end, for filling the high-temperature sealing element with inert gas for insulation; the high-temperature sealing element has a clamping block for mounting test samples; a water outlet channel is formed between the high-temperature sealing element and the distribution pipe; the outer cylinder has an inlet pipe connecting to the inlet channel and an outlet pipe connecting to the outlet channel at one end connected to the distribution pipe; The high-temperature sealing element has a cylindrical structure with several cooling through holes extending through both ends along the circumference of its cylindrical wall. Two adjacent cooling through holes serve as the inlet and outlet channels for the cooling medium, respectively. At one end of the high-temperature sealing element, in addition to the inlet and outlet channels, there is a confluence groove connecting every two adjacent cooling through holes. At the other end of the high-temperature sealing element, there is also a confluence groove connecting every two adjacent cooling through holes, and the confluence grooves at both ends of the high-temperature sealing element are staggered. The confluence grooves are welded with flow channel covers to seal them. After entering through the inlet channel, the cooling medium flows through adjacent cooling through holes in sequence and then flows out through the outlet channel.

2. The heat-insulated cooling high-temperature irradiation device according to claim 1, characterized in that, The outer cylinder includes a lower end cap, a central sealing cap, a positioning flange, a diversion flange cylinder with flanges at both ends, and an outer sleeve with open ends. The lower end cap is welded to one end of the outer sleeve. The positioning flange is used to connect to the stack top cover and is welded to the other end of the outer sleeve. The diversion flange cylinder is welded to the positioning flange. The flange at the end of the diversion flange cylinder away from the positioning flange is welded to the central sealing cap. The water outlet pipe and the diversion pipe are both welded to the central sealing cap. The water inlet pipe is welded to the side wall of the diversion flange cylinder.

3. The heat-insulated cooling high-temperature irradiation device according to claim 1, characterized in that, The inner wall of the high-temperature seal is coated with a ceramic coating.

4. The heat-insulated cooling high-temperature irradiation device according to claim 1, characterized in that, The high-temperature sealing component includes a cooling cylinder, an inner upper cover plate, and an inner lower cover plate. The inner upper cover plate is welded to one end of the cooling cylinder, and the inner lower cover plate is welded to the other end of the cooling cylinder.

5. The heat-insulated cooling high-temperature irradiation device according to claim 4, characterized in that, One end of the air outlet pipe is welded to the inner upper cover plate, and a support frame for supporting the inner lower cover plate is fixed inside the outer cylinder.

6. The heat-insulated cooling high-temperature irradiation device according to claim 1, characterized in that, A spring positioning frame and a spring are provided between the end of the high-temperature sealing component near the outlet pipe and the clamping block. One end of the spring positioning frame serves as a support for the clamping block, and the other end of the spring positioning frame is fitted with a spring, which abuts against the end of the high-temperature sealing component.

7. The heat-insulated cooling high-temperature irradiation device according to claim 6, characterized in that, A first heat insulation pad is provided between the spring positioning frame and the clamping block.

8. The heat-insulated cooling high-temperature irradiation device according to claim 1, characterized in that, A mixing bottom plate is provided between the end of the high-temperature seal near the air inlet pipe and the clamping block. The mixing bottom plate includes a plate body and support ribs on both sides of the plate body. The plate body is provided with several mixing holes. The support rib on one side of the plate body abuts against the end of the high-temperature seal, and the support rib on the other side of the plate body abuts against the clamping block.

9. The heat-insulated cooling high-temperature irradiation device according to claim 8, characterized in that, A second heat insulation pad is provided between the mixing bottom plate and the clamping block.

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