Irradiation test device and gas injection device

Abstract

The invention provides an irradiation test device and a gas injection device, and the irradiation test device comprises a sleeve which is arranged in a center hole of a fuel element in a penetrating manner; the first end is arranged on the sleeve and used for covering a pipe opening in one end of the sleeve, the first end is provided with a gas inlet communicated with the sleeve, and the gas inlet is used for introducing protective gas; the second end is arranged on the sleeve and used for covering a pipe opening in the other end of the sleeve; the containing assembly is arranged in the sleeve, the containing assembly comprises a containing pipe, covering parts and a heat release part, the containing pipe is used for being arranged on the to-be-radiated cladding part in a sleeving mode, the heat release part is used for being arranged on the to-be-radiated cladding part in a penetrating mode, the two ends of the containing pipe are both covered with the covering parts, and the covering parts are connected with the heat release part; the containing pipe, the covering part and the heat releasing part are all used for being in clearance fit with a cladding part to be irradiated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of irradiation testing, and in particular to an irradiation testing device and a gas injection device. Background Art

[0002] In order to confirm the irradiation results of materials in the irradiation environment, and to understand the changes in the internal structure of the materials before and after irradiation by inspecting the irradiated materials, irradiation tests are usually carried out on the materials.

[0003] In related art, irradiation test apparatuses are often used as carriers for irradiated samples, ensuring stable placement of the samples during the test and providing a stable and reliable irradiation environment. However, these irradiation test apparatuses used for the holes in fuel elements often lack the ability to regulate the temperature of the irradiated samples, making them difficult to implement when high temperature requirements are present. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] In view of this, according to a first aspect of an embodiment of the present disclosure, an irradiation test device is proposed, comprising:

[0006] A sleeve, used to penetrate the hole in the fuel element;

[0007] The first end is provided on the sleeve and is used to cover an end of the sleeve. The first end is provided with an air inlet connected to the sleeve, and the air inlet is used to receive a protective gas;

[0008] A second end cap is provided on the sleeve and is used to cover the other end of the sleeve;

[0009] The accommodating component is arranged in the sleeve, and the accommodating component includes an accommodating tube, a covering member, and a heat releasing member. The accommodating tube is used to be sleeved on the cladding member to be radiated, and the heat releasing member is used to pass through the cladding member to be radiated. Both ends of the accommodating tube are covered with covering members, and the covering members are connected to the heat releasing member.

[0010] The accommodating tube, the covering member and the heat releasing member are all used for clearance fit with the cladding member to be irradiated.

[0011] In a feasible embodiment, the accommodating tube includes:

[0012] Multiple arc-shaped clamping blocks can be spliced ​​into a tubular structure, and the arc-shaped clamping blocks are limitedly matched with the covering parts;

[0013] Wherein, the number of arc-shaped clamping blocks is greater than or equal to 3.

[0014] In a feasible embodiment, the irradiation test device further includes:

[0015] The temperature measuring component is arranged in the sleeve, and the temperature measuring component and the accommodating component are arranged along the axial direction of the sleeve;

[0016] The temperature measuring component includes a bearing part and a temperature measuring part. The bearing part is provided with a mounting groove and an observation port connected to the mounting groove. The temperature measuring part is arranged in the mounting groove.

[0017] In a feasible embodiment, the temperature measuring part is made of metal material, and the shape of the temperature measuring part is adapted to the shape of the mounting groove; in the projection plane perpendicular to the conduction direction of the observation port, the orthographic projection of the observation port is located within the range of the orthographic projection of the mounting groove.

[0018] In a feasible embodiment, the number of mounting slots and the number of observation ports are both multiple, and the mounting slots and the observation ports correspond one to one. Temperature measuring parts are provided in the multiple mounting slots, and the melting points of at least two temperature measuring parts are different.

[0019] In a feasible embodiment, the bearing portion includes:

[0020] The base is provided with a mounting slot and an observation port;

[0021] A limiting member is detachably provided on the base and is used to cover or open the notch of the installation slot;

[0022] The base is further provided with a countersunk hole which is connected to the mounting groove.

[0023] In a feasible embodiment, the irradiation test device further includes:

[0024] The neutron detection assembly is arranged in the sleeve. The neutron detection assembly, the temperature measurement assembly and the accommodating assembly are arranged along the axial direction of the sleeve. The temperature measurement assembly is located between the neutron detection assembly and the accommodating assembly. The neutron detection assembly is located on the side of the temperature measurement assembly close to the first end.

[0025] In a feasible embodiment, the irradiation test device further includes:

[0026] a support member, disposed between the neutron detection assembly and the first end;

[0027] The elastic component is arranged between the accommodating component and the second end, and is used to apply a force to the accommodating component along a direction from the second end to the first end.

[0028] In a feasible embodiment, a first gas channel is defined between the accommodating component and the sleeve, and the first gas channel is connected to the gas inlet; and / or

[0029] A second gas channel is defined between the temperature measuring component and the sleeve, and the second gas channel is connected to the gas inlet; and / or

[0030] A third gas channel is defined between the neutron detection assembly and the sleeve, and the third gas channel is communicated with the gas inlet.

[0031] According to a second aspect of an embodiment of the present disclosure, a gas injection device is provided for use in the irradiation test device provided in any one of the first aspects above. The gas injection device includes:

[0032] The box body is provided with a transition cavity, the transition cavity being used to be connected to the air inlet of the first end;

[0033] a first gas supply portion, for delivering a first inert gas into the transition chamber;

[0034] a second gas supply portion for delivering a second inert gas into the transition chamber, wherein the first inert gas is different from the second inert gas;

[0035] The control unit is used to control the gas output of the first gas supply unit and the gas output of the second gas supply unit according to the temperature requirement information of the irradiation test.

[0036] The above description is only an overview of the technical solution provided by the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other features and effects of the present disclosure more obvious and easy to understand, the implementation methods of the present disclosure are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the exemplary embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. Throughout the drawings, like reference symbols denote like parts. In the drawings:

[0038] Figure 1 A schematic structural diagram of an irradiation test device according to an embodiment of the present disclosure;

[0039] Figure 2 A schematic exploded structural diagram of a temperature measurement component according to an embodiment of the present disclosure;

[0040] Figure 3 A schematic structural diagram of a base according to an embodiment of the present disclosure;

[0041] Figure 4 A schematic structural diagram of a sleeve according to an embodiment of the present disclosure;

[0042] Figure 5 for Figure 4 A schematic partial enlarged view of the casing is shown;

[0043] Figure 6A schematic structural diagram of a first end head according to an embodiment of the present disclosure;

[0044] Figure 7 A schematic structural diagram of a second end head according to an embodiment of the present disclosure;

[0045] Figure 8 A schematic structural diagram of a neutron detection assembly according to an embodiment of the present disclosure;

[0046] Figure 9 A schematic structural diagram of a support member according to an embodiment of the present disclosure;

[0047] Figure 10 A schematic structural diagram of an elastic component according to an embodiment of the present disclosure;

[0048] Figure 11 A schematic exploded structural diagram of a housing assembly according to an embodiment of the present disclosure;

[0049] Figure 12 A schematic structural diagram of a heat-releasing element according to an embodiment of the present disclosure;

[0050] Figure 13 A schematic structural diagram of an arc-shaped clamping block according to an embodiment of the present disclosure;

[0051] Figure 14 A schematic structural diagram of a cover according to an embodiment of the present disclosure;

[0052] Figure 15 A schematic structural diagram of a top block according to an embodiment of the present disclosure;

[0053] Figure 16 A schematic structural diagram of a gas injection device according to an embodiment of the present disclosure;

[0054] Figure 17 A schematic structural diagram of a cutting fixture according to an embodiment of the present disclosure.

[0055] in, Figures 1 to 17 The corresponding relationship between the reference numerals and component names is as follows:

[0056] 100' cladding to be irradiated;

[0057] 100 irradiation test device; 200 gas injection device; 300 cutting fixture;

[0058] 110 sleeve; 120 first end; 130 second end; 140 accommodation component; 141 accommodation tube; 141a arc-shaped clamping block; 142 covering member; 144 heat release member; 145 top block; 150 temperature measuring component; 151 bearing portion; 151a base; 151b limit member; 152 temperature measuring portion; 160 neutron detection component; 161 box body; 162 box cover; 170 support member; 180 elastic component; 181 support rod; 182 spring; 183 support;

[0059] 210 box body; 220 first air supply part; 230 second air supply part; 240 vacuum pump; 250 air supply valve; 260 flow meter; 270 pressure gauge; 280 welding machine;

[0060] 1201 air intake;

[0061] 1501 mounting slot; 1502 observation port; 1503 countersunk hole;

[0062] 2101 transition cavity;

[0063] 301 matching hole; 302 notch. DETAILED DESCRIPTION

[0064] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0065] like Figures 1 to 15 As shown, according to the first aspect of the embodiment of the present disclosure, an irradiation test device 100 is proposed, comprising: a sleeve 110, which is used to pass through the hole in the fuel element; a first end head 120, which is provided on the sleeve 110 and is used to cover one end of the sleeve 110, and the first end head 120 is provided with an air inlet 1201 connected to the sleeve 110, and the air inlet 1201 is used to receive a protective gas; a second end head 130, which is provided on the sleeve 110 and is used to cover the other end of the sleeve 110; The component 140 is disposed in the sleeve 110. The accommodating component 140 includes a accommodating tube 141, a covering member 142, and a heat releasing member 144. The accommodating tube 141 is used to be sleeved on the cladding member to be irradiated, and the heat releasing member 144 is used to pass through the cladding member to be irradiated. Both ends of the accommodating tube 141 are covered with covering members 142, and the covering member 142 is connected to the heat releasing member 144. Among them, the accommodating tube 141, the covering member 142, and the heat releasing member 144 are all used to fit with the cladding member 100' to be irradiated.

[0066] like Figure 1As shown, the irradiation test device 100 provided in the embodiment of the present disclosure includes the aforementioned sleeve 110, the first end head 120, the second end head 130 and the accommodating assembly 140. Based on the aforementioned arrangement, in actual application, the irradiation test device 100 can utilize the aforementioned accommodating assembly 140 to load the cladding member 100' to be irradiated, and can cooperate with the central hole of the fuel element through the aforementioned sleeve 110 so that the irradiation test device 100 and the cladding member 100' to be irradiated loaded therein are located in the central hole of the fuel element, thereby providing an irradiation environment for the cladding member 100' to be irradiated; wherein, the aforementioned sleeve 110 is provided. The first end cap 120 and the second end cap 130 are used to cover the two ends of the sleeve 110 respectively, so that the internal environment of the sleeve 110 can be relatively stable, and the position of other components or parts in the sleeve 110 can be constrained to avoid large displacement of the other components or parts in the tube, which is beneficial to improving the position stability of the cladding 100' to be irradiated during the experiment and improving the stability of the environment in which the cladding 100' to be irradiated is located, providing a guarantee for the smooth progress of the irradiation test; the aforementioned accommodating component 140 is arranged inside the aforementioned sleeve 110, such as Figure 2 and Figure 3 As shown, the accommodating assembly 140 includes the aforementioned accommodating tube 141, a covering member 142 and a heat releasing member 144. The aforementioned accommodating tube 141 can provide a placement space for the aforementioned cladding member 100' to be irradiated. The aforementioned heat releasing member 144 is arranged inside the accommodating tube 141. In actual application, the aforementioned cladding member 100' to be irradiated can be sleeved on the heat releasing member 144. The number of the aforementioned covering members 142 can be at least two. At least one covering member 142 is respectively provided at both ends of the aforementioned accommodating tube 141, and the heat releasing member 144 can be connected between the covering members 142 at both ends of the accommodating tube 141. Therefore, in actual application, the accommodating assembly 140 can utilize the heat releasing member 144 and the cover 142 constrain the axial and radial positions of the cladding member 100' to be irradiated in the accommodating tube 141, and can limit the range of movement of the cladding member 100' to be irradiated in the accommodating tube 141, thereby enhancing the positional stability of the cladding member 100' to be irradiated; the aforementioned heat releasing member 144 is made of metal material, so that the heat releasing member 144 is suitable for self-heating in the neutron field to provide heat to the cladding member 100' to be irradiated, and then the heat releasing member 144 can heat the cladding member 100' to be irradiated during the irradiation test, which is conducive to the irradiation test device 100 to adapt to the higher temperature requirements of the irradiation test and reduce the difficulty of implementing the irradiation test with high temperature requirements.

[0067] like Figure 6As shown, the first end 120 may be provided with an air inlet 1201 connected to the interior of the casing 110. The air inlet 1201 may be used to receive and introduce a shielding gas into the casing 110, thereby utilizing the shielding gas to protect the irradiation test apparatus 100 and the cladding member 100' to be irradiated. It will be appreciated that, in actual use, the air inlet 1201 may be connected to the gas injection device 200 after the irradiation test apparatus 100 is assembled to receive the shielding gas, and the air inlet may be sealed after the gas injection is complete to prevent shielding gas leakage. The shielding gas may include one or more inert gases, i.e., the shielding gas may be a single inert gas or a mixture of several inert gases.

[0068] The aforementioned accommodating tube 141, covering member 142 and heat releasing member 144 are all used to fit with the cladding member 100' to be irradiated in a clearance manner, thereby providing space for the deformation of the cladding member 100' to be irradiated during the irradiation test, reducing the risk of deformation caused by mutual squeezing between the accommodating assembly 140 and the cladding member 100' to be irradiated during the test, which is beneficial to improving the structural reliability and stability of the irradiation test device 100 and ensuring the reliability of the test results. It can be understood that the cladding member 100' to be irradiated is generally a thin-walled tubular structure. Accordingly, the cladding member 100' to be irradiated can be sleeved on the aforementioned heat release member 144 through the inner hole and passed through the aforementioned accommodating tube 141. In actual application, the covering members 142 at both ends of the accommodating tube 141 also correspond to the two ends of the cladding member 100' to be irradiated. Considering the shape adaptability of the accommodating tube 141 and the heat release member 144 to the cladding member 100' to be irradiated, the accommodating tube 141 can be a circular tubular structure, and the heat release member 144 can be a cylindrical structure. Based on this, the clearance fit between the aforementioned accommodating tube 141 and the aforementioned cladding member 100' to be irradiated means that the inner diameter of the accommodating tube 141 is larger than the outer diameter of the cladding member 100' to be irradiated; the clearance fit between the aforementioned covering member 142 and the aforementioned cladding member 100' to be irradiated means that the minimum distance between the covering members 142 at both ends of the accommodating tube 141 is larger than the axial length of the cladding member 100' to be irradiated; the clearance fit between the aforementioned heat releasing member 144 and the aforementioned cladding member 100' to be irradiated means that the outer diameter of the heat releasing member 144 is smaller than the inner diameter of the cladding member 100' to be irradiated.

[0069] It should be noted that, by providing the aforementioned accommodating tube 141, covering member 142 and heat releasing member 144 for gap fit with the cladding member 100' to be irradiated, a plurality of air gaps can be formed around the cladding member 100' to be irradiated, thereby utilizing the air gaps to increase the thermal resistance of the cladding member 100' to be irradiated during heat transfer, which is beneficial to heat-insulating the cladding member 100' to be irradiated, reducing heat loss of the accommodating assembly 140, improving the temperature stability of the environment in which the cladding member 100' to be irradiated is located, and is beneficial to ensuring the heating effect of the heat releasing member 144 on the cladding member 100' to be irradiated, thereby adapting to the higher temperature requirements of the irradiation test. Accordingly, in practical applications, the diameter of the heat releasing member 144 can be set based on the temperature requirements of the irradiation test and the size of the cladding member 100' to be irradiated, so as to adjust the thickness of the air gap between the heat releasing member 144 and the cladding member 100' to be irradiated according to the temperature requirements of the aforementioned irradiation test, thereby making the thermal resistance of the aforementioned air gap adapt to the requirements of the irradiation test, and further ensuring the thermal insulation effect of the accommodating component 140.

[0070] For example, Figure 1 As shown, the first end head 120 and the second end head 130 can be respectively installed at the two ends of the sleeve 110 in the axial direction and sealed and welded. The internal space of the sleeve 110 is used to accommodate other components. For example, the aforementioned accommodating assembly 140 can be set inside the sleeve 110.

[0071] For example, Figure 4 and Figure 5 As shown, the outer circumferential wall of the sleeve 110 may be formed with multiple ribs evenly spaced along the circumference of the sleeve 110. When the sleeve 110 is placed in the fuel element's central hole, the multiple ribs can separate the annular gap between the outer circumferential wall of the sleeve 110 and the wall of the fuel element's central hole into multiple evenly spaced channels for fluid flow, thereby reducing flow-induced vibration, ensuring cooling conditions for the irradiation device, and ensuring safe operation of the irradiation test. The number of the aforementioned ribs can be greater than or equal to three.

[0072] For example, Figure 6 As shown, one end of the first end cap 120 can be generally conical to facilitate mating between the first end cap 120 and the fuel element; the other end of the first end cap 120 can be generally cylindrical or stepped-shaft-shaped to facilitate mating with the sleeve 110. One end of the aforementioned gas inlet 1201 can be located at the aforementioned generally conical end. In actual applications, the diameter of the gas inlet 1201 can be set to be relatively small to facilitate sealing after gas injection. The diameter of the gas inlet 1201 can be less than or equal to 1 / 3 of the inner diameter of the sleeve 110. It will be understood that in actual applications, the first end cap 120 can be arranged at the bottom of the hole corresponding to the hole in the fuel element.

[0073] For example, Figure 7As shown, the second end head 130 can be designed to be easy to grasp. For example, the second end head 130 can include a fitting section, a connecting section and a grasping section. The fitting section can be roughly cylindrical or stepped, and is used to fit the sleeve 110. The grasping section can be roughly conical. The connecting section can be roughly cylindrical and coaxially arranged with the fitting section and the grasping section. The connecting section is connected between the fitting section and the grasping section, and its diameter is smaller than that of the grasping section.

[0074] For example, Figures 11 to 15 As shown, the housing assembly 140 may further include a top block 145. The aforementioned cover 142 may have a mounting hole in its middle, into which one end of the top block 145 may be inserted. The cover 142 may have a plurality of matching grooves formed around its periphery. The housing tube 141 may have a plurality of matching protrusions formed at both ends, with the matching grooves and matching protrusions corresponding one-to-one, and the matching protrusions adapted to be inserted into the matching grooves. The top block 145 may be roughly in the shape of a stepped shaft, with larger diameters at both ends in the axial direction and smaller diameters in the middle. The end of the top block 145 facing away from the cover 142 may be connected to one end of the aforementioned heat release element 144. The top block 145 and the cover 142 may be arranged in a one-to-one correspondence. The top block 145, the cover 142, and the sleeve 110 may be welded together.

[0075] Exemplarily, the outer peripheral side of the cover 142 can be formed with ribs for matching the inner peripheral wall of the sleeve 110. The number of the aforementioned ribs can be multiple, and they can be evenly distributed along the peripheral side of the cover 142, so as to facilitate the centering positioning between the sleeve 110 and the accommodating component 140 during the assembly of the irradiation test device 100, and can define a plurality of first gas channels evenly arranged circumferentially around the accommodating component 140 between the cover 142 and the inner peripheral wall of the sleeve 110. The aforementioned first gas channels are connected to the air inlet 1201, so that the protective gas is evenly distributed around the accommodating component 140.

[0076] Exemplarily, the heat releasing element 144 is made of stainless steel or molybdenum-rhenium alloy.

[0077] like Figure 11 、 Figure 13 and Figure 14 As shown, in some examples, the accommodating tube 141 includes: multiple arc-shaped clamping blocks 141a, multiple arc-shaped clamping blocks 141a can be spliced ​​into a tubular structure, and the arc-shaped clamping blocks 141a are limitedly matched with the covering member 142; wherein, the number of the arc-shaped clamping blocks 141a is greater than or equal to 3.

[0078] In this technical solution, the accommodating tube 141 may include a plurality of the aforementioned arc-shaped clamping blocks 141a; based on the aforementioned arrangement, the accommodating tube 141 may be a split structure. Accordingly, when the accommodating tube 141 is used to accommodate the cladding component 100' to be irradiated, the plurality of arc-shaped clamping blocks 141a may be arranged on the covering member 142, so that the plurality of arc-shaped clamping blocks 141a are spliced ​​to form a tubular structure under the limiting constraint of the covering member 142, thereby providing an accommodating space for the cladding component 100' to be irradiated; when the cladding component in the accommodating assembly 140 needs to be removed, the aforementioned covering member 142 may be removed, and accordingly, the limiting constraints on the plurality of arc-shaped clamping blocks 141a are released, which can facilitate the separation of the plurality of arc-shaped clamping blocks 141a from each other, thereby exposing the aforementioned cladding component, and facilitating the removal of the irradiated cladding component after the test, thereby reducing the operational difficulty of the test.

[0079] It is understood that the plurality of arcuate clamping blocks 141a can be different circumferential portions of the same tubular structure. For example, taking a circular tubular structure as an example, the arcuate clamping blocks 141a can be the same length as the circular tubular structure, have the same radius, and have a total central angle of 360°. Thus, when the number of arcuate clamping blocks 141a is greater than or equal to three, the central angle of each arcuate clamping block 141a is less than or equal to 120°, thereby reducing the circumferential coverage of the cladding member 100' to be irradiated by a single arcuate clamping block 141a. This reduces the risk of the cladding member becoming embedded within a particular arcuate clamping block 141a and becoming difficult to separate after the cover member 142 is removed. For example, the number of arcuate clamping blocks 141a is three, and the central angles of all three arcuate clamping blocks 141a are 120°.

[0080] It is understood that the aforementioned mating protrusions can be formed at both ends of the aforementioned arc-shaped clamping block 141a, and the mating protrusions can be arc-shaped protrusions. Accordingly, the central angle of the aforementioned arc-shaped protrusions can be smaller than the central angle of the arc-shaped clamping block 141a. For example, the central angle of the aforementioned arc-shaped protrusions can be 1 / 3 of the central angle of the arc-shaped clamping block 141a. For example, when the central angle of the arc-shaped clamping block 141a is 120°, the central angle of the arc-shaped protrusions can be 40°. Correspondingly, the aforementioned mating grooves can be arc-shaped grooves that are compatible with the aforementioned arc-shaped protrusions. When the mating protrusions of multiple arc-shaped clamping blocks 141a are all inserted into the corresponding mating grooves on the cover 142, multiple arc-shaped clamping blocks 141a are spliced ​​into the aforementioned tubular structure.

[0081] It is understandable that when multiple aforementioned arc-shaped clamping blocks 141 a are spliced ​​into a tubular structure, a certain gas gap can be formed between two adjacent arc-shaped clamping blocks 141 a to allow part of the protective gas to enter the accommodating tube 141 during the process of injecting the protective gas.

[0082] like Figure 2 and Figure 3 As shown, in some examples, the irradiation test device 100 also includes: a temperature measuring component 150, which is arranged in the sleeve 110, and the temperature measuring component 150 and the accommodating component 140 are arranged along the axial direction of the sleeve 110; wherein, the temperature measuring component 150 includes a bearing portion 151 and a temperature measuring portion 152, the bearing portion 151 is provided with a mounting groove 1501 and an observation port 1502 connected to the mounting groove 1501, and the temperature measuring portion 152 is arranged in the mounting groove 1501.

[0083] In this technical solution, the irradiation device can also include the aforementioned temperature measuring component 150; based on the aforementioned setting, the irradiation test device 100 can use the temperature measuring component 150 to detect the irradiation environment temperature information during the irradiation test. The aforementioned temperature measuring component 150 includes a carrying part 151 and a temperature measuring part 152. The temperature measuring part 152 is arranged in the installation groove 1501 of the carrying part 151 to fix the setting position of the temperature measuring part 152, and the observation port 1502 of the carrying part 151 can expose at least part of the temperature measuring part 152 in the installation groove 1501, so that when the temperature measuring component 150 is taken out of the sleeve 110 after the test, it is convenient for the test personnel to directly observe the temperature measured by the temperature measuring part 152, which is convenient for the operating personnel to obtain the temperature measurement results, thereby improving the use convenience of the irradiation test device 100. Furthermore, by arranging the temperature measuring assembly 150 and the accommodating assembly 140 along the axial direction of the sleeve 110 , the overall structural compactness of the irradiation test device 100 can be improved, and the position of the temperature measuring device is relatively close to the accommodating assembly 140 , thereby improving the pertinence of the temperature measurement results to the cladding member 100 ′ to be irradiated.

[0084] It can be understood that the aforementioned temperature measuring part 152 can be but is not limited to a temperature sensor or a temperature measuring element with a fixed melting point or melting range; when the temperature measuring part 152 is the aforementioned temperature measuring element, the temperature range of the irradiation experiment process can be judged by observing the melting condition of the temperature measuring element.

[0085] In some examples, the temperature measuring portion 152 is made of a metal material, and the shape of the temperature measuring portion 152 is adapted to the shape of the mounting groove 1501; in the projection plane perpendicular to the conduction direction of the observation port 1502, the orthographic projection of the observation port 1502 is located within the range of the orthographic projection of the mounting groove 1501.

[0086] In this technical solution, constraints are imposed on the size of the observation port 1502 and the material and shape of the temperature measuring portion 152. Based on the aforementioned arrangement, on the one hand, the temperature measuring portion 152 can have a relatively stable melting point, so that the test personnel can conveniently determine the approximate temperature during the irradiation test by observing the melting of the temperature measuring portion 152 after the test. On the other hand, the conduction area of ​​the observation port 1502 can be made smaller than the minimum cross-sectional area of ​​the mounting groove 1501 and the temperature measuring portion 152, thereby reducing the risk of the temperature measuring portion 152 falling out through the observation port 1502 and ensuring the installation reliability of the temperature measuring portion 152.

[0087] Exemplarily, the temperature measuring portion 152 may be made of an alloy material.

[0088] like Figure 2 and Figure 3 As shown, in some examples, the number of mounting slots 1501 and the number of observation ports 1502 are both multiple, and the mounting slots 1501 and the observation ports 1502 correspond one to one, and temperature measuring parts 152 are provided in the multiple mounting slots 1501, and the melting points of at least two temperature measuring parts 152 are different from each other.

[0089] In this technical solution, the number of mounting slots 1501 , observation ports 1502 and temperature measuring parts 152 is limited, and melting point differences can be formed between the multiple temperature measuring parts 152 ; based on the above settings, the temperature measurement accuracy of the temperature measuring component 150 can be improved.

[0090] Illustratively, the melting points of the plurality of temperature measuring portions 152 are different from each other.

[0091] like Figure 2 and Figure 3 As shown, in some examples, the supporting portion 151 includes: a base 151a, which is provided with a mounting slot 1501 and an observation port 1502; a limiting member 151b, which is detachably arranged on the base 151a, and is used to cover or open the slot of the mounting slot 1501; wherein, the base 151a is also provided with a countersunk hole 1503, and the countersunk hole 1503 is connected to the mounting slot 1501.

[0092] In this technical solution, the bearing portion 151 may include the aforementioned base 151a and the aforementioned limiter 151b; based on the aforementioned arrangement, the bearing portion 151 may utilize the base 151a and the limiter 151b to constrain the position of the temperature measuring portion 152, so that the temperature measuring portion 152 is fixed in the mounting groove 1501, thereby improving the installation reliability of the temperature measuring portion 152, and when the temperature measuring portion 152 melts, the countersunk hole 1503 may be utilized to access at least part of the liquefied temperature measuring portion 152, thereby causing the volume of the temperature measuring portion 152 in the mounting groove 1501 to change, so that the test personnel may more intuitively observe the melting condition of the temperature measuring portion 152 after the test.

[0093] It is understood that the mounting groove 1501 may be a slot-shaped structure with one end open, so as to facilitate the installation of the temperature measuring portion 152 through the slot of the mounting groove 1501. Accordingly, when the stopper 151b is connected to the base 151a, the slot may be covered by the stopper 151b to prevent the temperature measuring portion 152 from falling out of the mounting groove 1501.

[0094] For example, Figure 3 As shown, the countersunk hole 1503 can be formed in the bottom wall of the mounting groove 1501, that is, the countersunk hole 1503 is arranged opposite the notch or the stopper 151b of the mounting groove 1501. In actual application, the countersunk hole 1503 can be arranged below the temperature measuring portion 152 along the direction of gravity. It is understood that the cross-sectional area of ​​the countersunk hole 1503 is smaller than the cross-sectional area of ​​the mounting groove 1501.

[0095] For example, Figure 2 and Figure 3 As shown, the aforementioned base 151a can be provided with a threaded hole, and correspondingly, the aforementioned limiting member 151b can have a screw, and the base 151a and the limiting member 151b are threadedly matched.

[0096] For example, Figure 3 As shown, the base 151a may be roughly cylindrical, and the observation port 1502 is located on the circumference of the base 151a.

[0097] For example, Figure 3 As shown, the outer peripheral side of the base 151a can be formed with ribs for matching the inner peripheral wall of the sleeve 110. The number of the aforementioned ribs can be multiple, and they are evenly distributed along the peripheral side of the base 151a, so as to facilitate the centering positioning between the sleeve 110 and the temperature measuring component 150 during the assembly of the irradiation test device 100, and can define a plurality of second gas channels evenly arranged circumferentially around the temperature measuring component 150 between the base 151a and the inner peripheral wall of the sleeve 110, and the second gas channels are connected to the air inlet 1201, so that the protective gas is evenly distributed around the temperature measuring component 150.

[0098] like Figure 1 and Figure 8 As shown, in some examples, the irradiation test device 100 further includes:

[0099] The neutron detection assembly 160 is disposed in the sleeve 110. The neutron detection assembly 160, the temperature measuring assembly 150 and the accommodating assembly 140 are arranged along the axial direction of the sleeve 110. The temperature measuring assembly 150 is located between the neutron detection assembly 160 and the accommodating assembly 140. The neutron detection assembly 160 is located on the side of the temperature measuring assembly 150 close to the first end 120.

[0100] In this technical solution, the irradiation test device 100 can also include the aforementioned neutron detection assembly 160; based on the aforementioned setting, on the one hand, the irradiation test device 100 can use the neutron detection assembly 160 to detect neutron flux information during the irradiation test; on the other hand, by arranging the neutron detection assembly 160, the temperature measurement assembly 150 and the accommodating assembly 140 along the axial direction of the sleeve 110, the structural compactness of the irradiation test device 100 can be improved, and the adaptability of the irradiation test device 100 to the hole in the fuel element can be improved.

[0101] For example, Figure 1 As shown, the aforementioned accommodating assembly 140, temperature measuring assembly 150, and neutron detection assembly 160 can correspond one to one. One accommodating assembly 140, one temperature measuring assembly 150, and one neutron detection assembly 160 constitute a set of test modules. The irradiation test device 100 can have multiple sets of the aforementioned test modules, and the multiple sets of the aforementioned test modules are arranged along the axial direction of the casing 110. For example, the number of the aforementioned test modules can be three sets, evenly distributed in the upper, middle, and lower parts of the casing 110. By selecting representative positions to arrange the temperature measuring assembly 150, the temperature detection results can reflect the temperature distribution in the axial direction of the casing 110.

[0102] For example, Figure 8 As shown, the neutron detection assembly 160 may include a box body 161 , a box cover 162 and a neutron detection piece. The box cover 162 is used to cover or open the box opening of the box body 161 , and the neutron detection piece is disposed in the box body 161 .

[0103] Exemplarily, ribs for cooperating with the inner circumferential wall of the sleeve 110 may be formed on the outer circumferential side of the box body 161. The number of the ribs may be multiple and evenly distributed along the circumferential side of the box body 161, so as to facilitate the centering positioning between the sleeve 110 and the neutron detection assembly 160 during the assembly of the irradiation test device 100, and to define a plurality of third gas channels evenly arranged circumferentially around the neutron detection assembly 160 between the box body 161 and the inner circumferential wall of the sleeve 110. The third gas channels are connected to the air inlet 1201, so that the protective gas is evenly distributed around the temperature measuring assembly 150.

[0104] like Figure 1 、 Figure 9 and Figure 10 As shown, in some examples, the irradiation test device 100 also includes: a support member 170, which is arranged between the neutron detection assembly 160 and the first end 120; and an elastic assembly 180, which is arranged between the accommodating assembly 140 and the second end 130, and is used to apply a force to the accommodating assembly 140 in a direction from the second end 130 to the first end 120.

[0105] In this technical solution, the irradiation test device 100 may also include the aforementioned support member 170 and the aforementioned elastic component 180; based on the aforementioned setting, the irradiation test device 100 can use the support member 170 and the elastic component 180 to constrain the axial position of the accommodating component 140, the temperature measuring component 150 and the neutron detection component 160 in the casing 110, which is beneficial to improving the position stability of the aforementioned components and enhancing the position stability of the cladding component 100' to be irradiated; and, when at least one of the aforementioned accommodating component 140, the temperature measuring component 150 and the neutron detection component 160 produces axial deformation due to neutron irradiation or thermal expansion, the elastic expansion deformation of the elastic component 180 can be used to compensate for the aforementioned axial deformation, thereby avoiding the first end head 120 and the second end head 130 from being subjected to excessive extrusion pressure, which is beneficial to improving the reliability of the irradiation test device 100.

[0106] It is understandable that after the radiation testing device 100 is assembled, the elastic component 180 has a certain amount of compression, so that the aforementioned force can be applied to the aforementioned accommodating component 140 .

[0107] For example, Figure 9 As shown, the aforementioned support member 170 can be in the shape of a stepped shaft, and the small-diameter shaft section of the support member 170 can be inserted into the inner hole of the first end head 120, and the inner hole of the first end head 120 is connected with the aforementioned air inlet 1201. Accordingly, the small-diameter shaft section of the support member 170 can be provided with an air groove, and the air groove is connected between the inner hole and the sleeve 110, so as to facilitate the protective gas to flow into the interior of the sleeve 110 through the aforementioned air inlet 1201, the inner hole of the first end head 120 and the aforementioned air groove.

[0108] For example, Figure 10 As shown, the elastic assembly 180 may include a support rod 181, a spring 182, and a support 183. The support rod 181 has an assembly hole for receiving the support 183. The spring 182 is mounted on the support 183 and its two ends are fixedly connected to the support 183 and the support rod 181. The spring 182 may be a standard cylindrical coil spring 182. When the spring 182 is in a free state, a portion of the support 183 extends into the assembly hole of the support rod 181, and the end of the support 183 away from the support rod 181 is inserted into the assembly hole of the second end 130 for fixation. When the elastic assembly 180 is installed in the device, the spring 182 may have a certain amount of compression. At this time, the elastic assembly 180 can exert a force on other components in the sleeve 110 and fix the axial position of other components.

[0109] In some examples, a first gas channel is defined between the accommodating component 140 and the sleeve 110, and the first gas channel is connected to the air inlet 1201; and / or a second gas channel is defined between the temperature measuring component 150 and the sleeve 110, and the second gas channel is connected to the air inlet 1201; and / or a third gas channel is defined between the neutron detection component 160 and the sleeve 110, and the third gas channel is connected to the air inlet 1201.

[0110] In this technical solution, the aforementioned first gas channel can be defined between the accommodating component 140 and the sleeve 110 ; based on the aforementioned setting, at least part of the protective gas can be distributed around the accommodating component 140 , thereby providing protection for the accommodating component 140 .

[0111] In this technical solution, the aforementioned second gas channel can be defined between the temperature measuring component 150 and the sleeve 110; based on the aforementioned setting, at least part of the protective gas can be distributed around the temperature measuring component 150, thereby providing protection for the temperature measuring component 150.

[0112] In this technical solution, the aforementioned third gas channel can be defined between the neutron detection assembly 160 and the sleeve 110; based on the aforementioned setting, at least part of the protective gas can be distributed around the neutron detection assembly 160, thereby providing protection for the neutron detection assembly 160.

[0113] It can be understood that, in practical applications, the irradiation test device 100 may have at least one, two, or all of the aforementioned first gas channel, second gas channel, and third gas channel.

[0114] Illustratively, the irradiation test device 100 has the aforementioned first gas channel, second gas channel, and third gas channel, and the first gas channel, the second gas channel, and the third gas channel are interconnected.

[0115] like Figure 16 As shown, according to the second aspect of the embodiment of the present disclosure, a gas injection device 200 is proposed, which is used for the irradiation test device 100 proposed in any one of the first aspects above, and the aforementioned gas injection device 200 includes: a box body 210, which is provided with a transition chamber 2101, and the transition chamber 2101 is used to connect to the air inlet 1201 of the first end 120; a first gas supply part 220, which is used to transport a first inert gas into the transition chamber 2101; a second gas supply part 230, which is used to transport a second inert gas into the transition chamber 2101, and the first inert gas is different from the second inert gas; a control part, which is used to control the gas output of the first gas supply part 220 and the gas output of the second gas supply part 230 according to the temperature requirement information of the irradiation test.

[0116] The gas injection device 200 provided in the embodiment of the present disclosure is used for the irradiation test device 100 proposed in any one of the first aspects above. In actual applications, the gas injection device 200 can inject one or two inert gases into the aforementioned air inlet 1201. Accordingly, the aforementioned protective gas can be a single inert gas or a mixture of two different inert gases. It can be understood that after the protective gas enters the sleeve 110 of the irradiation test device 100, it can be distributed around the various components in the sleeve 110, thereby protecting the sleeve 110 and the various components in the sleeve 110 and improving the thermal resistance around the sleeve 110 and the aforementioned various components, which is beneficial to reducing the heat dissipation efficiency of the irradiation test device 100 and improving the adaptability of the irradiation test device 100 to irradiation tests with high temperature requirements.

[0117] The gas injection device 200 includes the aforementioned housing 210, a first gas supply unit 220, a second gas supply unit 230, and a control unit. Based on the aforementioned configuration, the gas injection device 200 can use the first gas supply unit 220 to fill the transition chamber 2101 with the first inert gas, and / or use the second gas supply unit 230 to fill the transition chamber 2101 with the second inert gas. When the gas inlet 1201 of the irradiation test device 100 is connected to the aforementioned transition chamber 2101, the first inert gas, the second inert gas, or a mixture of the first inert gas and the second inert gas in a certain ratio can be introduced to inject protective gas into the irradiation test device 100. In addition, the gas injection device 200 can use the control unit to regulate the gas output of the first gas supply unit 220 and the second gas supply unit 230, that is, the control unit can control the gas output of the first gas supply unit 220 and the gas output of the second gas supply unit 230 according to the temperature requirement information of the irradiation test, so that the gas composition in the transition chamber 2101 can match the aforementioned temperature requirement information, thereby changing the thermal resistance of the protective gas after being filled into the irradiation test device 100, which is beneficial for the insulation effect of the irradiation test device 100 to match the aforementioned temperature requirement information, further enhancing the adaptability of the irradiation test device 100 to irradiation tests with high temperature requirements, and providing favorable conditions for the irradiation test device 100 to meet the temperature requirements of the irradiation test.

[0118] It can be understood that when the gas components are different or the shape of the space in which the gas is located is different, the thermal resistance of the gas in the corresponding space will also be different, thereby affecting the heat transfer efficiency between the space and the external environment; in actual applications, the heat transfer efficiency of the irradiation test device 100 when filled with protective gases of different components can be measured to calibrate the first relationship between the aforementioned heat transfer efficiency and the protective gas component, and then the second relationship between the aforementioned heat transfer efficiency and the temperature requirement of the irradiation test can be combined to calibrate the third relationship between the protective gas component and the aforementioned temperature requirement information, so as to control the gas output of the first gas supply part 220 and the second gas supply part 230 according to the aforementioned third relationship.

[0119] In some feasible examples, the gas injection device 200 also includes a vacuum pump 240, a gas supply valve 250, a flow meter 260, a pressure gauge 270 and a welder 280, wherein the vacuum pump 240 is connected to the aforementioned transition chamber 2101, the first gas supply part 220 and the second gas supply part 230 respectively include a first gas cylinder and a second gas cylinder, and the gas outlet ends of the first gas cylinder and the second gas cylinder are both provided with the aforementioned gas supply valve 250, the gas supply valve 250 is connected to the aforementioned transition chamber 2101 through a pipeline, and a flow meter 260 is provided on the aforementioned pipeline, so as to facilitate the use of the flow meter 260 to obtain the flow information in the corresponding pipeline, and then facilitate the determination of the gas output of the first gas supply part 220 and the second gas supply part 230, the aforementioned pressure gauge 270 is used to obtain the pressure information of the aforementioned transition chamber 2101, the aforementioned vacuum pump 240 is used to vacuum the aforementioned transition chamber 2101, and the aforementioned welder 280 is arranged in the aforementioned transition chamber 2101.

[0120] Based on the above configuration of the technical solution, in actual application, the gas injection device 200 can perform the gas injection operation on the irradiation test device 100 according to the following steps:

[0121] Step S1: inserting the irradiation test device 100 into the box body 210 so that the air inlet 1201 is located in the transition cavity 2101 , and sealing the fitting gap between the irradiation test device 100 and the box body 210 ;

[0122] Step S2: Control the vacuum pump 240 to evacuate the air so as to discharge the gas in the transition chamber 2101 and the irradiation test device 100;

[0123] Step S3: controlling the first gas supply part 220 and / or the second gas supply part 230 to output inert gas, wherein the gas output of the first gas supply part 220 and the second gas supply part 230 is determined according to the temperature requirement information of the irradiation test;

[0124] Step S4: Repeat steps S2 and S3 multiple times to ensure the gas replacement effect in the transition chamber 2101 and the irradiation test device 100;

[0125] Step S5: controlling the welder 280 to perform sealing welding on the air inlet 1201 to block the air inlet 1201 .

[0126] Step S6: Perform helium leak detection on the irradiation test device 100 to ensure that the irradiation test device 100 meets the leak detection requirements.

[0127] It should be noted that after the irradiation test is completed, the inner space of the accommodating tube 141 can be opened by cutting off the covering members 142 at both ends of the accommodating assembly 140, so as to facilitate the removal of the irradiated cladding member. Figure 17 As shown, the present disclosure also provides a cutting fixture 300 for the accommodation component 140 of the irradiation test device 100 proposed in any one of the first aspects above. The aforementioned cutting fixture 300 can be in the shape of a rotating body, for example, in a stepped shaft mount. The cutting fixture 300 is provided with an axially extending mating hole 301 and a radially extending notch 302. The aforementioned mating hole 301 axially penetrates the cutting fixture 300, and the notch 302 radially penetrates the cutting fixture 300, and the length of the notch 302 in the axial direction of the cutting fixture 300 is less than the axial length of the cutting fixture 300, that is, the notch 302 does not axially penetrate the cutting fixture 300; one end of the notch 302 is located at one end of the cutting fixture 300 in the axial direction, and the notch 302 is communicated with the aforementioned mating hole 301; the aforementioned mating hole 301 is used to be sleeved on the accommodation tube 141 of the irradiation test device 100.

[0128] Based on the above-mentioned setting, one axial end of the cutting fixture 300 can have a higher radial deformation ability, so that during the radial deformation process, the conduction area of ​​one end of the matching hole 301 can be changed. Accordingly, the conduction area of ​​one end of the matching hole 301 can be expanded to facilitate the aforementioned accommodating tube 141 to penetrate into or exit the matching hole 301; during the cutting process, a clamping device can be used to apply a radial clamping force to the section of the cutting fixture 300 corresponding to the notch 302, so that the matching hole 301 can be contracted, thereby clamping the aforementioned accommodating tube 141 to facilitate the covering part 142.

[0129] It is understandable that, in the case where the accommodating component 140 includes the aforementioned top block 145 that is substantially in the shape of a stepped shaft, the cutting tool can be used to cut corresponding to the thinner portion of the top block 145 .

[0130] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0131] In the description of the present disclosure, it is to be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, cannot be understood as a limitation on the present disclosure.

[0132] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0133] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. An irradiation test device, characterized in that: include: A sleeve, used to penetrate the hole in the fuel element; a first end cap, provided on the sleeve and used to cover one end of the sleeve; the first end cap is provided with an air inlet connected to the sleeve, and the air inlet is used to receive a protective gas; A second end cap is provided on the sleeve and is used to cover the other end of the sleeve; a receiving assembly disposed in the sleeve, the receiving assembly comprising a receiving tube, a covering member, and a heat releasing member; the receiving tube is used to be sleeved on the cladding member to be irradiated; the heat releasing member is used to pass through the cladding member to be irradiated; both ends of the receiving tube are covered with the covering member, and the covering member is connected to the heat releasing member; The accommodating tube, the covering member and the heat releasing member are all used for clearance fit with the cladding member to be irradiated.

2. The irradiation test device according to claim 1, characterized in that: The accommodating tube comprises: A plurality of arc-shaped clamping blocks, wherein the plurality of arc-shaped clamping blocks can be spliced ​​into a tubular structure, and the arc-shaped clamping blocks are limitedly matched with the covering member; Wherein, the number of the arc-shaped clamping blocks is greater than or equal to 3.

3. The irradiation test device according to claim 1, characterized in that: Also includes: A temperature measuring component is disposed in the sleeve, wherein the temperature measuring component and the accommodating component are arranged along the axial direction of the sleeve; The temperature measuring component includes a bearing portion and a temperature measuring portion. The bearing portion is provided with a mounting groove and an observation port connected to the mounting groove. The temperature measuring portion is arranged in the mounting groove.

4. The irradiation test device according to claim 3, characterized in that: The temperature measuring part is made of metal material, and the shape of the temperature measuring part is adapted to the shape of the mounting groove; in the projection plane perpendicular to the conducting direction of the observation port, the orthographic projection of the observation port is located within the range of the orthographic projection of the mounting groove.

5. The irradiation test device according to claim 4, characterized in that: The number of the installation slots and the number of the observation ports are both multiple, and the installation slots and the observation ports correspond one to one. The temperature measuring parts are all provided in the multiple installation slots, and the melting points of at least two of the temperature measuring parts are different from each other.

6. The irradiation test device according to claim 4, characterized in that: The bearing portion includes: A base is provided with the mounting slot and the observation port; a limiting member, detachably provided on the base, for covering or opening the notch of the installation slot; Wherein, the base is further provided with a countersunk hole, and the countersunk hole is connected to the mounting groove.

7. The irradiation test device according to any one of claims 3 to 6, characterized in that: Also includes: The neutron detection assembly is arranged in the sleeve, and the neutron detection assembly, the temperature measurement assembly and the accommodating assembly are arranged along the axial direction of the sleeve. The temperature measurement assembly is located between the neutron detection assembly and the accommodating assembly, and the neutron detection assembly is located on the side of the temperature measurement assembly close to the first end.

8. The irradiation test device according to claim 7, characterized in that: Also includes: a support member, disposed between the neutron detection assembly and the first end head; An elastic component is disposed between the accommodating component and the second end head, and is used to apply a force to the accommodating component along a direction from the second end head to the first end head.

9. The irradiation test device according to claim 7, characterized in that: A first gas channel is defined between the accommodating component and the sleeve, and the first gas channel is connected to the gas inlet; and / or A second gas channel is defined between the temperature measuring component and the sleeve, and the second gas channel is connected to the gas inlet; and / or A third gas channel is defined between the neutron detection assembly and the sleeve, and the third gas channel is communicated with the gas inlet.

10. A gas injection device, characterized in that: For use in the irradiation test device according to any one of claims 1 to 9, the gas injection device comprises: The box body is provided with a transition cavity, the transition cavity being used to communicate with the air inlet of the first end head; a first gas supply portion, configured to deliver a first inert gas into the transition chamber; a second gas supply portion, configured to deliver a second inert gas into the transition chamber, wherein the first inert gas is different from the second inert gas; The control unit is used to control the gas output of the first gas supply unit and the gas output of the second gas supply unit according to the temperature requirement information of the irradiation test.

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