Device for fixing the external temperature measuring element of the cladding

Abstract

Embodiments of the present application relate to the field of nuclear reactor technology, and more specifically, to a device for fixing a temperature measuring element on the outside of a cladding and a device for performing a high-temperature oxidation test on the cladding. The device for fixing the temperature measuring element on the outside of the cladding comprises: a first support member having a measurement fixing portion formed therein, the temperature measuring element being disposed on the measurement fixing portion; the first support member being configured to expand under the action of a first external force and to return to its original shape when the first external force is removed, thereby clamping the outer surface of the cladding and fixing the temperature measuring element; a second support member being configured to contract under the action of a second external force to place the cladding into a quartz tube and to return to its original shape when the second external force is removed, thereby abutting against the inner surface of the quartz tube; and a connecting member for connecting the first support member and the second support member, and being configured to follow the changes of the first support member and the second support member under the action of the first external force or the second external force. The fixing device of the embodiment of the present application is relatively simple to operate and facilitates the stable fixing of the temperature measuring element to the cladding.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of nuclear reactor technology, and specifically to a device for fixing a temperature measuring element on the outside of a cladding and a device for performing a high-temperature oxidation test on the cladding. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] During reactor operation, various accidents can occur that could affect reactor safety. For example, a loss of coolant (LOC) accident (LOCA) causes the fuel elements within the reactor to heat up rapidly, leading to increased internal pressure and a loss of external pressure. This inevitably causes the cladding to bulge or even rupture, allowing radioactive material to enter the primary circuit. In severe cases, this could even block some of the core coolant channels.

[0004] To study the performance of cladding under high-temperature oxidation conditions and understand its bulging and bursting behavior during a loss-of-coolant accident (LOCA) event, it is necessary to conduct tests under these conditions. Currently, high-temperature oxidation tests are typically performed on unirradiated cladding. However, the results obtained from these tests cannot fully reflect the performance of irradiated cladding. Summary of the Invention

[0005] A brief overview of the present application is provided below to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify key or important portions of the present application, nor is it intended to limit the scope of the present application. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description that will be discussed later.

[0006] In a first aspect, an embodiment of the present application provides a device for fixing a temperature measuring element on the outside of a cladding, which is suitable for fixing the temperature measuring element to the outside of the cladding to measure the temperature of the cladding, wherein the cladding is arranged in a quartz tube, and comprises: a first support member, the first support member is formed with a measurement fixing portion, the temperature measuring element is arranged on the measurement fixing portion, the first support member is configured to expand under the action of a first external force, and to restore its original shape when the first external force is removed, so as to clamp the outer surface of the cladding, and is configured to fix the temperature measuring element when the first support member clamps the outer surface; a second support member The second support member is configured to shrink under the action of a second external force so as to place the cladding into the quartz tube, and is configured to restore its original shape when the second external force is removed so as to abut against the inner surface of the quartz tube after the cladding is placed into the quartz tube; a connecting member, the connecting member is used to connect the first support member and the second support member, and is configured to follow the changes of the first support member and the second support member under the action of the first external force or the second external force, and provide support for the first support member and the second support member when the first support member clamps the outer surface of the cladding and the second support member abuts against the inner surface of the quartz tube.

[0007] The device provided by the embodiment of the present application sets the first support member to be deformable, and the first support member can be used to clamp the cladding by applying a first external force. The operation is relatively simple and easy to disassemble. The temperature measuring member can be fixed to the outer surface of the cladding by the measurement fixing portion on the first support member, which is convenient for remote operation. At the same time, the first support member is connected to the second support member through a connecting member, and the second support member and the connecting member are both set to be deformable, so that the second support member can abut against the inner surface of the quartz tube under the action of the second external force, which is conducive to the firm fixation of the temperature measuring member and the cladding, and thus, is conducive to measuring the temperature of the cladding.

[0008] On the second aspect, an embodiment of the present application also provides a device for performing a high-temperature oxidation test on the cladding, which includes: a quartz tube, the cladding is arranged in the quartz tube; a heating element, the heating element is arranged outside the quartz tube, and is used to heat the cladding; a temperature measuring element, the temperature measuring element is arranged inside the quartz tube and located outside the cladding, and is used to measure the temperature of the cladding; an apparatus for fixing the temperature measuring element outside the cladding in an embodiment of the present application is used to fix the temperature measuring element to the outside of the cladding.

[0009] On the third aspect, an embodiment of the present application further provides a device for performing a high-temperature oxidation test on a cladding, comprising: a quartz tube, wherein the cladding is arranged inside the quartz tube; a heating element, wherein the heating element is arranged outside the quartz tube and is used to heat the cladding; a temperature measuring element, wherein the temperature measuring element is arranged inside the quartz tube and outside the cladding and is used to measure the temperature of the cladding; a device for fixing the cladding and the quartz tube, configured to fix the cladding inside the quartz tube; and, a device for fixing the temperature measuring element outside the cladding according to an embodiment of the present application, which is used to fix the temperature measuring element outside the cladding.

[0010] These and other advantages of the present application will become more apparent through the following detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] To further illustrate the above and other advantages and features of the present application, the following detailed description of specific embodiments of the present application is provided in conjunction with the accompanying drawings. The accompanying drawings, together with the detailed description below, are incorporated into and form a part of this specification. Elements with the same function and structure are denoted by the same reference numerals. It should be understood that these drawings depict only typical examples of the present application and should not be construed as limiting the scope of the present application.

[0012] Figure 1 1 is a schematic diagram of the structure of the device for fixing the temperature measuring element outside the cladding, the cladding, the temperature measuring element, and the quartz tube according to an embodiment of the present application;

[0013] Figure 2 yes Figure 1 The structure shown is a schematic diagram after omitting the quartz tube;

[0014] Figure 3 1 is a schematic structural diagram of a device for fixing a temperature measuring element on the outside of a cladding according to an embodiment of the present application;

[0015] Figure 4 yes Figure 3 a top view of the device shown;

[0016] Figure 5 1 is a schematic structural diagram of a device for fixing a cladding and a quartz tube according to an embodiment of the present application;

[0017] Figure 6 It is the use of Figure 5 The schematic diagram of the structure of the device shown after the cladding and the quartz tube are fixed;

[0018] Figure 7 It is the use of Figure 5 The schematic diagram of the structure of the device shown is when the first fixing member abuts against the inner surface of the enclosure.

[0019] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0020] Description of reference numerals:

[0021] 10. Second fixing device; 11. First fixing member; 111. Notch; 12. Second fixing member; 121. Notch; 13. Clamping member; 131. Clamping surface;

[0022] 20. Cladding;

[0023] 30. Quartz tube;

[0024] 40. First fixing device; 41. First support member; 411. Measurement fixing portion; 412. Accommodation groove; 42. Second support member; 421. Clamping portion; 43. Connecting member;

[0025] 50. Temperature measuring device. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary depending on the implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is a routine task for those skilled in the art who benefit from the content of this application.

[0027] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, the accompanying drawings only show the device structure and / or processing steps that are closely related to the solution according to the present application, while other details that are not closely related to the present application are omitted.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application should have the common meanings understood by persons having ordinary skills in the field to which this application belongs.

[0029] In the description of the embodiments of the present application, “multiple” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the related art, a high-temperature oxidation test on the cladding is usually conducted to study the relationship between the cladding's burst temperature, burst pressure, and strain. Since the temperature of the cladding needs to be continuously measured and collected online during the test, the arrangement of the temperature measuring parts is crucial. The inventors of the present application found that in traditional off-reactor tests, welding, clamps, and the like are often used to fix the temperature measuring parts on the outside of the cladding. However, since the irradiated cladding is radioactive and needs to be tested in a hot chamber, it is impossible to fix the temperature measuring parts in a manner similar to that outside the reactor with almost no operational constraints. Instead, a manipulator is required to operate, and the current method of fixing the temperature measuring parts is not ideal.

[0031] In order to solve the above technical problems, the embodiment of the present application provides a device for fixing the external temperature measuring element of the cladding. Figure 1and Figure 2 , Figure 1 2 is a schematic diagram of the structure of the device for fixing the temperature measuring element 50 outside the cladding 20, the cladding 20, the temperature measuring element 50 and the quartz tube 30 according to an embodiment of the present application. Figure 2 yes Figure 1 The structure shown is schematically illustrated without the quartz tube 30. This device is suitable for securing a temperature measuring element 50 to the exterior of the cladding 20 to measure the surface temperature of the cladding 20. The cladding 20 is disposed within the quartz tube 30. For ease of description and understanding, the device for securing the temperature measuring element 50 to the exterior of the cladding 20 will be referred to as the first securing device 40.

[0032] Reference Figure 2 The first fixing device 40 may include a first supporting member 41 , a second supporting member 42 and a connecting member 43 .

[0033] The first support member 41 is formed with a measuring fixing portion 411, and the temperature measuring member 50 is arranged on the measuring fixing portion 411. The first support member 41 is configured to expand under the action of a first external force and to restore its original shape when the first external force is removed to clamp the outer surface of the cladding 20, and is configured to fix the temperature measuring member 50 when the first support member 41 clamps the outer surface.

[0034] The second support member 42 is configured to contract under the action of a second external force to place the cladding 20 into the quartz tube 30, and is configured to restore its original shape when the second external force is removed, so as to abut against the inner surface of the quartz tube 30 after the cladding 20 is placed into the quartz tube 30.

[0035] The connecting member 43 is used to connect the first support member 41 and the second support member 42, and is configured to follow the changes of the first support member 41 and the second support member 42 under the action of the first external force or the second external force, and provide support for the first support member 41 and the second support member 42 when the first support member 41 clamps the outer surface of the cladding 20 and the second support member 42 abuts the inner surface of the quartz tube 30.

[0036] The first fixing device 40 provided in the embodiment of the present application sets the first support member 41 to be deformable. By applying a first external force, the first support member 41 can be used to clamp the cladding 20. The operation is relatively simple and easy to disassemble. The temperature measuring member 50 can be fixed to the outer surface of the cladding 20 through the measurement fixing portion 411 on the first support member 41, which is convenient for remote operation. At the same time, the first support member 41 is connected to the second support member 42 through the connecting member 43, and the second support member 42 and the connecting member 43 are both set to be deformable, so that the second support member 42 can abut against the inner surface of the quartz tube 30 under the action of the second external force, which is conducive to the firm fixation of the temperature measuring member 50 and the cladding 20, thereby facilitating the measurement of the temperature of the cladding 20.

[0037] In some embodiments, the cladding 20 may be an irradiated cladding, which is radioactive.

[0038] In some embodiments, the first support member 41 , the second support member 42 , and the connecting member 43 may be made of a high-temperature resistant alloy, such as GH2747, niobium-zirconium alloy, tantalum, and the like.

[0039] In some embodiments, the temperature measuring element 50 may be a thermocouple.

[0040] In some embodiments, a manipulator can be used to expand the inner contact surface of the first support member 41 so that the first support member 41 can be placed on the outer surface of the cladding 20, so that the first support member 41 can clamp the outer surface of the cladding 20. The force applied by the manipulator when expanding the inner contact surface of the first support member 41 is the first external force.

[0041] In some embodiments, the structure of the manipulator is configured to achieve a gripping function. For example, the structure of the manipulator can be a compass-like structure.

[0042] In some embodiments, the outer contact surface of the second support member 42 is gripped by a manipulator, and the second support member 42 can be retracted to place the first fixture 40, the cladding 20, and the temperature measuring element 50 fixed to the outside of the cladding 20 into the quartz tube 30. The manipulator is then released, and the second support member 42 can return to its original shape and abut against the inner surface of the quartz tube 30. The force applied by the manipulator when gripping the outer contact surface of the second support member 42 is the second external force.

[0043] In some embodiments, since the first support member 41 is connected to the second support member 42 through the connecting member 43, and the first support member 41, the second support member 42 and the connecting member 43 can all be deformed, when the first external force or the second external force is applied, the first support member 41, the second support member 42 and the connecting member 43 can be deformed as a whole; when the first external force or the second external force is removed, the first support member 41, the second support member 42 and the connecting member 43 can be restored to their original shape as a whole.

[0044] In some embodiments, the connecting member 43 is an elastic member, which is used to apply forces in opposite directions to the first support member 41 and the second support member 42 under the action of the first external force or the second external force to support the first support member 41 and the second support member 42, thereby helping to ensure that the first support member 41 can stably and firmly fix the temperature measuring member 50 on the outside of the shell 20 to avoid movement.

[0045] In some embodiments, the elastic member is a spiral spring, and the spiral spring is designed to satisfy the following expressions (1) and (2).

[0046] In some embodiments, the pitch of the spiral spring, the maximum outer diameter of the spiral spring, and the minimum radius of the spiral spring satisfy the following expression (1):

[0047]

[0048] Wherein, t represents the pitch of the spiral spring; R2 represents the maximum outer diameter of the spiral spring; R1 represents the minimum radius of the spiral spring, R1=kh, k represents the first material coefficient of the spiral spring, h represents the thickness of the material of the spiral spring; l represents the expanded length of the spiral spring.

[0049] In some embodiments, the deformation angle of the spiral spring and the torque that the spiral spring can provide satisfy the following expression (2):

[0050]

[0051] Wherein, θ represents the deformation angle of the spiral spring; T represents the torque of the spiral spring; E represents the elastic modulus of the material of the spiral spring; b represents the material width of the spiral spring; and h represents the material thickness of the spiral spring.

[0052] The embodiment of the present application controls the magnitude of the force provided by the spiral spring by controlling the pitch of the spiral spring and the deformation angle of the spiral spring, thereby avoiding damage or destruction to the cladding 20 and the quartz tube 30 while ensuring that the temperature measuring component 50 is firmly fixed.

[0053] In some embodiments, the value of k may be in the range of 8 to 15 and may be determined according to the material of the scroll spring.

[0054] In some embodiments, reference Figure 3 and Figure 4 , Figure 3 2 is a schematic structural diagram of a device for fixing a temperature measuring element 50 outside the cladding 20 according to an embodiment of the present application. Figure 4 yes Figure 3In the top view of the device shown, the measuring fixing portion 411 protrudes outward along the abutting surface when the first support member 41 abuts the outer surface of the cladding 20, and is formed with a receiving groove 412, which is used to accommodate the temperature measuring member 50 and fix the temperature measuring member 50.

[0055] In the embodiment of the present application, the measurement fixing portion 411 is configured to include a receiving groove 412 , so that the temperature measuring element 50 can be fixed to the outside of the enclosure 20 through the receiving groove 412 , thereby further improving the fixing effect and facilitating the temperature measuring element 50 to be firmly fixed to the outside of the enclosure 20 .

[0056] In some embodiments, a plurality of measurement fixing portions 411 may be formed on the first support member 41 to facilitate fixing the plurality of temperature measuring members 50 to the outside of the cladding 20 , thereby facilitating improving the accuracy of measuring the temperature of the cladding 20 .

[0057] In some embodiments, the second support member 42 is formed with a clamping portion 421 , and the clamping portion 421 is used to receive the action of the second external force, so that the second external force is applied to the second support member 42 through the clamping portion 421 .

[0058] In some embodiments, reference Figure 3 The clamping portion 421 is a plane formed on the second support member 42 to provide a clamping position for the robot.

[0059] In some embodiments, the first support member 41 is located radially inward of the second support member 42, and the first support member 41 has a first predetermined length along the extension direction of the cladding 20, and the second support member 42 has a second predetermined length along the extension direction of the cladding 20 to assist in fixing the cladding 20 and the quartz tube 30.

[0060] In the embodiment of the present application, the first support member 41 is arranged radially inward of the second support member 42, and the first support member 41 and the second support member 42 both have a predetermined length along the extension direction of the cladding 20. Therefore, after the first fixing device 40, the temperature measuring element 50 and the cladding 20 are placed together in the quartz tube 30, the first fixing device 40 can be used to provide support for the cladding 20 and the quartz tube 30, which is conducive to the stable placement of the cladding 20 in the quartz tube 30.

[0061] In some embodiments, the connecting member 43 has a sixth predetermined length along the extension direction of the cladding 20 .

[0062] In some embodiments, the first predetermined length, the second predetermined length, and the sixth predetermined length are equal.

[0063] In some embodiments, the inner diameter of the first support member 41 is smaller than the outer diameter of the cladding 20 , thereby facilitating the first support member 41 to firmly clamp the outer surface of the cladding 20 .

[0064] In some embodiments, the elastic member is a scroll spring. When the first support member 41 abuts against the outer surface of the cladding 20, the clamping force provided by the first support member 41 to the cladding 20 satisfies the following expression (3):

[0065]

[0066] Among them, F c R represents the clamping force provided by the first support member to the cladding. c represents the inner diameter of the shell, R1 represents the minimum radius of the spiral spring, R1=kh, k represents the first material coefficient, h represents the thickness of the material of the spiral spring; E represents the elastic modulus of the material of the spiral spring; b represents the width of the material of the spiral spring; h represents the thickness of the material of the spiral spring; K represents the second material coefficient of the spiral spring; l represents the expanded length of the spiral spring.

[0067] In some embodiments, the second material coefficient may be in the range of 1 to 1.25 and may be determined according to the material of the spiral spring.

[0068] In some embodiments, the elastic member is a scroll spring. When the second support member 42 abuts against the inner surface of the quartz tube 30, the support force provided by the second support member 42 to the quartz tube 30 satisfies the following expression (4):

[0069]

[0070] Among them, F s R represents the supporting force provided by the second supporting member 42 to the quartz tube; s represents the inner diameter of the quartz tube; R2 represents the maximum outer diameter of the scroll spring; E represents the elastic modulus of the material of the scroll spring; b represents the width of the material of the scroll spring; h represents the thickness of the material of the scroll spring; K represents the second material coefficient of the scroll spring; l represents the expanded length of the scroll spring.

[0071] In the embodiment of the present application, the minimum inner diameter R1 of the first support member 41 and the outer diameter R C To control the size of the clamping force when the first support member 41 clamps the outer surface of the cladding 20, and to control the maximum outer diameter R2 of the second support member 42 and the inner diameter R S By controlling the clamping force of the second support member 42 when clamping the inner surface of the quartz tube 30, the temperature of the outer surface of the cladding 20 can be measured while ensuring that the temperature measuring member 50 is firmly fixed, while avoiding damage to the cladding 20.

[0072] In some embodiments, one end of the first support member 41 forms a free end, the other end of the first support member 41 is connected to one end of the connecting member 43, the other end of the connecting member 43 is connected to one end of the second support member 42, the other end of the second support member 42 forms a free end, and the first support member 41, the second support member 42 and the connecting member 43 are formed as one piece.

[0073] In the embodiment of the present application, the first support member 41 , the second support member 42 and the connecting member 43 are made into an integral part, and both the first support member 41 and the second support member 42 are formed with free ends, so the structure is relatively simple and easy to process.

[0074] In some embodiments, the overall structure of the first support member 41 , the second support member 42 and the connecting member 43 is a coil spring.

[0075] In some embodiments, the coil spring may be obtained by coiling a strip and then performing a heat treatment.

[0076] In some embodiments, during a high-temperature oxidation test on the cladding 20, because the compressive force of the spring structure is much smaller than the thermal stress experienced by the cladding 20, the first fixing device 40 does not affect the deformation of the cladding 20 during the bulging and blasting of the cladding 20. Even if the cladding 20 deforms, the spring's elastic force allows it to continue securing the temperature measuring element 50 on the outside of the cladding 20, thereby enabling continuous monitoring of the temperature signal of the cladding 20 during the test.

[0077] In some embodiments, the process of fixing the temperature measuring component 50 to the outside of the cladding 20 using a manipulator and the first fixing device 40 provided in an embodiment of the present application includes: the inner contact surface of the first clamping component can be stretched open by the manipulator to put the first clamping component on the outside of the cladding 20, and then the temperature measuring component 50 is extended into the accommodating groove 412 of the measuring fixing portion 411, and the manipulator is released; then the manipulator is used to clamp the clamping portion 421 of the second support component 42, so that the first support component 41, the connecting component 43 and the second support component 42 are contracted as a whole to place them as a whole into the quartz tube 30, and then the manipulator is released, and the outer contact surface of the second support component 42 abuts against the inner surface of the quartz tube 30.

[0078] An embodiment of the present application further provides a device for performing a high-temperature oxidation test on the cladding 20, comprising: a quartz tube 30, wherein the cladding 20 is disposed inside the quartz tube 30; a heating element, wherein the heating element is disposed outside the quartz tube 30 and is used to indirectly heat the cladding 20; a temperature measuring element 50, wherein the temperature measuring element 50 is disposed inside the quartz tube 30 and outside the cladding 20 and is used to measure the temperature of the cladding 20; and a device for fixing the temperature measuring element 50 outside the cladding 20 according to an embodiment of the present application, wherein the device is used to fix the temperature measuring element 50 to the outside of the cladding 20.

[0079] The embodiment of the present application fixes the temperature measuring element 50 to the outside of the cladding 20 through a device for fixing the temperature measuring element 50 on the outside of the cladding 20, which is conducive to continuously and accurately measuring the temperature of the cladding 20, thereby facilitating the smooth implementation of high-temperature oxidation tests.

[0080] In some embodiments, during the high temperature oxidation test, steam flows through the quartz tube 30. In some embodiments, the heating element may be a heating furnace, which heats the quartz tube 30 from outside the quartz tube 30, thereby indirectly heating the cladding 20.

[0081] In some embodiments, the apparatus for performing a high-temperature oxidation test on the cladding 20 may further include a manipulator, which is configured to remotely secure the temperature measuring element 50 to the cladding 20. In such an embodiment, remotely securing the temperature measuring element 50 to the cladding 20 using the manipulator can reduce operator involvement, thereby helping to reduce radiation exposure to the operator.

[0082] An embodiment of the present application further provides a device for performing a high-temperature oxidation test on the cladding 20, comprising: a quartz tube 30, wherein the cladding 20 is disposed inside the quartz tube 30; a heating element, wherein the heating element is disposed outside the quartz tube 30 and is used to heat the cladding 20; a temperature measuring element 50, wherein the temperature measuring element 50 is disposed inside the quartz tube 30 and outside the cladding 20 and is used to measure the temperature of the cladding 20; a device for fixing the cladding 20 and the quartz tube 30, wherein the device is configured to fix the cladding 20 inside the quartz tube 30; and a device for fixing the temperature measuring element 50 outside the cladding 20 according to an embodiment of the present application, wherein the device is configured to fix the temperature measuring element 50 outside the cladding 20.

[0083] In some embodiments, reference Figures 5 to 7 , Figure 5 2 is a schematic structural diagram of a device for fixing the cladding 20 and the quartz tube 30 according to an embodiment of the present application. Figure 6 It is the use of Figure 5 The schematic diagram of the structure of the device after fixing the cladding 20 and the quartz tube 30 is shown. Figure 7 It is the use of Figure 5 The schematic structural diagram of the device shown is when the first fixing member abuts against the inner surface of the cladding 20. The device for fixing the cladding 20 and the quartz tube 30 (hereinafter referred to as the second fixing device 10) may include a first fixing member 11, a second fixing member 12, and a clamping member 13.

[0084] The first fixing member 11 is configured to be connected to the clamping member 13, and the second fixing member 12 is configured to be connected to the clamping member 13. The first fixing member 11 and the second fixing member 12 are configured to contract when a third external force acts on the clamping member 13, and when the third external force is removed from the clamping member 13, the first fixing member 11 and the second fixing member 12 are configured to return to their original shape. The first fixing member 11 is configured to abut against the inner surface of the cladding 20 when it returns to its original shape, and the second fixing member 12 is configured to abut against the inner surface of the quartz tube 30 when it returns to its original shape.

[0085] The second fixing device 10 provided in the embodiment of the present application can simultaneously fix the cladding 20 and the quartz tube 30 by applying a third external force to the clamping member 13; it can also simultaneously realize the disassembly between the cladding 20 and the quartz tube 30 and the second fixing device 10 and the quartz tube 30 by removing the third external force from the clamping member 13, which can simplify the operation of fixing the cladding 20 and the quartz tube 30, facilitate remote operation, and improve the efficiency of the high-temperature oxidation test; at the same time, the first fixing member 11 and the second fixing member 12 are configured to be able to abut against the inner surface of the cladding 20 and the inner surface of the quartz tube 30 respectively when returning to their original shape, which is conducive to achieving stable fixation of the cladding 20, thereby facilitating the high-temperature oxidation test of the cladding 20.

[0086] In some embodiments, the cladding 20 to be fixed may be an irradiated cladding 20 that is radioactive.

[0087] In some embodiments, when the first fixing member 11 contracts, the first fixing member 11 may enter the enclosure 20 .

[0088] In some embodiments, the first fixing member 11, the second fixing member 12, and the clamping member 13 can be integrally formed. For example, the first fixing member 11, the second fixing member 12, and the clamping member 13 can be stamped from a ring tube. In other embodiments, the first fixing member 11, the second fixing member 12, and the clamping member 13 can be connected by welding. For example, the second fixing device 10 can be formed by rolling a strip and then welding it.

[0089] In some embodiments, the second fixing device 10 may be made of a high-temperature resistant alloy, such as GH2747 alloy, niobium-zirconium alloy, tantalum, or other alloy materials.

[0090] Reference Figure 5In some embodiments, the first fixing member 11 can be configured as a circular member having a notch 111, and connected to one end of the clamping member 13 at the notch 111. In some embodiments, the second fixing member 12 can also be configured as a circular member having a notch 121, and connected to the other end of the clamping member 13 at the notch 121. In such an embodiment, by configuring the first fixing member 11 and the second fixing member 12 as circular members having a notch 111 and a notch 121, respectively, the first fixing member 11 and the second fixing member 12 can shrink when a third external force acts on the clamping member 13; and the first fixing member 11 and the second fixing member 12 can return to their original shape when the third external force is removed.

[0091] In some embodiments, the first fixing member 11 is located radially inward of the second fixing member 12, so that the fixed cladding 20 can be located radially inward of the quartz tube 30. In some embodiments, the radius of the circle of the first fixing member 11 is smaller than the radius of the circle of the second fixing member 12.

[0092] Reference Figure 5 In some embodiments, the clamping surface 131 of the clamping member 13 can be located between the connection position with the first fixing member 11 and the connection position with the second fixing member 12. In such an embodiment, when a third external force acts on the clamping member 13, both the first fixing member 11 and the second fixing member 12 can be contracted; and when the third external force is removed from the clamping member 13, both the first fixing member 11 and the second fixing member 12 can be restored to their original shapes.

[0093] Reference Figure 5 In some embodiments, the first fixture 11 has a third predetermined length along the extension direction of the cladding 20, and the second fixture 12 has a fourth predetermined length along the extension direction of the cladding 20, where the third predetermined length is greater than the fourth predetermined length. In such an embodiment, the third predetermined length is greater than the fourth predetermined length, so that the bottom surface of the cladding 20 and the bottom surface of the quartz tube 30 are not in direct contact, but rather have a height difference. Furthermore, the notch 111 in the first fixture 11 allows high-temperature steam to flow between the inner and outer surfaces of the cladding 20, facilitating simultaneous oxidation of both the inner and outer surfaces of the cladding 20.

[0094] In some embodiments, the clamping member 13 has a fifth predetermined length along the extending direction of the cladding 20 , and the third predetermined length is greater than the fifth predetermined length.

[0095] Reference Figure 5In some embodiments, the position where the first fixing member 11 is connected to the clamping member 13 can be set to be an arc shape, and the radius of the arc shape is set so that when the first fixing member 11 abuts against the inner surface of the cladding 20 when it returns to its original shape, the abutting force between the two is within a predetermined range, so as to avoid the abutting force causing damage to the cladding 20, thereby avoiding affecting the test results of the high-temperature oxidation test.

[0096] In some embodiments, the first fixing member 11 and the cladding 20 need to structurally satisfy the following expression (5) to control the stability of the connection between the cladding 20 and the first fixing member 11 while preventing the cladding 20 from being elastically damaged by the first fixing member 11 .

[0097]

[0098] Among them, F a represents the difference between the gravity of the cladding 20 and the force exerted by the airflow on the cladding during the test; μ1 represents the sliding friction coefficient between the first fixing member 11 and the cladding 20; R a0 represents the radius of the mid-plane of the first fixing member 11 after deformation; α a I represents half of the opening angle of the notch 111 after the first fixing member 11 is deformed; a G represents the moment of inertia of the circular cross section of the first fixing member 11; a A represents the shear elastic modulus of the material of the first fixing member 11; a k represents the cross-sectional area of ​​the circular ring of the first fixing member 11; a E represents the shear shape coefficient of the annular interface of the first fixing member 11; a represents the elastic modulus of the material of the first fixing member 11; R a1 represents the outer diameter of the first fixing member 11 before deformation.

[0099] Reference Figure 5 In some embodiments, the position where the second fixing member 12 is connected to the clamping member 13 can also be set to be an arc shape, and the radius of the arc shape is set so that when the second fixing member 12 abuts against the inner surface of the quartz tube 30 when it returns to its original shape, the abutting force between the two is within a predetermined range, so as to avoid the abutting force causing damage to the quartz tube 30, thereby avoiding affecting the test results of the high-temperature oxidation test.

[0100] In some embodiments, the second fixing member 12 and the quartz tube 30 need to structurally satisfy the following expression (6) to control the stability of the connection between the quartz tube 30 and the second fixing member 12 while preventing the quartz tube 30 from being elastically damaged by the second fixing member 12.

[0101]

[0102] Among them, F brepresents the difference between the sum of the weights of the cladding 20, the first fixing member 11, the second fixing member 12, the cladding 20 and the clamping member 13 and the force exerted by the airflow on the above four during the test; μ2 represents the sliding friction coefficient between the second fixing member 12 and the cladding 20; R b0 represents the radius of the mid-plane of the second fixing member 12 after deformation; α b It represents half of the opening angle of the notch 121 after the second fixing member 12 is deformed; I b G represents the moment of inertia of the circular cross section of the second fixing member 12; b A represents the shear elastic modulus of the material of the second fixing member 12; b k represents the cross-sectional area of ​​the circular ring of the second fixing member 12; b E represents the shear shape coefficient of the annular interface of the second fixing member 12; b represents the elastic modulus of the material of the second fixing member 12; R b1 represents the outer diameter of the second fixing member 12 before deformation.

[0103] In some embodiments, the process of fixing the cladding 20 to the quartz tube 30 using a manipulator and the second fixing device 10 provided in an embodiment of the present application includes: using the manipulator to apply a third external force to the clamping member 13 so that the second fixing device 10 can enter the quartz tube 30; placing the cladding 20 on the second fixing device 10, and using the manipulator to apply a third external force to the clamping member 13 so that the first fixing member 11 and the second fixing member 12 shrink; when the first fixing member 11 enters the cladding 20, removing the third external force applied to the clamping member 13 by the manipulator, and the first fixing member 11 and the second fixing member 12 return to their original shape, thereby completing the fixation of the cladding 20 and the quartz tube 30.

[0104] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0105] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for fixing a temperature measuring element on the outside of a cladding, which is suitable for fixing the temperature measuring element on the outside of the cladding to measure the temperature of the cladding, wherein the cladding is arranged in a quartz tube, characterized in that: It includes: a first support member, wherein the first support member is formed with a measurement fixing portion, the temperature measuring member is disposed on the measurement fixing portion, the first support member is configured to expand under the action of a first external force, and to restore its original shape when the first external force is removed, so as to clamp the outer surface of the cladding, and is configured to fix the temperature measuring member when the first support member clamps the outer surface; a second support member, the second support member being configured to contract under a second external force so as to place the cladding into the quartz tube, and being configured to restore its original shape when the second external force is removed so as to abut against an inner surface of the quartz tube after the cladding is placed into the quartz tube; a connecting member, the connecting member being used to connect the first supporting member and the second supporting member, and being configured to follow the changes of the first supporting member and the second supporting member under the action of the first external force or the second external force, and providing support for the first supporting member and the second supporting member when the first supporting member clamps the outer surface of the cladding and the second supporting member abuts against the inner surface of the quartz tube; The connecting member is an elastic member, configured to apply forces in opposite directions to the first supporting member and the second supporting member respectively under the action of the first external force or the second external force, so as to support the first supporting member and the second supporting member; The second support member is formed with a clamping portion, and the clamping portion is used to receive the action of the second external force; The first support member is located radially inward of the second support member. Furthermore, the first support member has a first predetermined length along the extension direction of the cladding, and the second support member has a second predetermined length along the extension direction of the cladding, so as to assist in fixing the cladding and the quartz tube; An inner diameter of the first support member is smaller than an outer diameter of the cladding.

2. The device according to claim 1, characterized in that The elastic member is a scroll spring, The force provided by the spiral spring and the design of the spiral spring satisfy the following expressions (1) and (2), The pitch of the spiral spring, the maximum outer diameter of the spiral spring, and the minimum radius of the spiral spring satisfy the following expression (1): （1） in, represents the pitch of the scroll spring; Indicates the maximum outer diameter of the scroll spring; represents the minimum radius of the spiral spring, , represents the first material coefficient of the spiral spring, Indicates the thickness of the material of the spiral spring; represents the expanded length of the scroll spring; The deformation angle of the spiral spring and the torque that the spiral spring can provide satisfy the following expression (2): （2） in, represents the deformation angle of the scroll spring; T represents the torque of the scroll spring; E represents the elastic modulus of the material of the scroll spring; b Indicates the width of the material of the spiral spring; h Indicates the thickness of the material of the spiral spring.

3. The device according to claim 1, characterized in that The measuring fixing portion protrudes outward along the contact surface when the first supporting member contacts the outer surface of the cladding, and is formed with a receiving groove. The accommodating groove is used to accommodate the temperature measuring component and fix the temperature measuring component.

4. The device according to claim 1, characterized in that The elastic member is a scroll spring. When the first support member abuts against the outer surface of the cladding, the clamping force provided by the first support member to the cladding satisfies the following expression (3): （3） in, F c represents the clamping force provided by the first support member to the cladding, R c represents the inner diameter of the cladding, represents the minimum radius of the spiral spring, , The first material coefficient is represented by Indicates the thickness of the material of the spiral spring; E represents the elastic modulus of the material of the scroll spring; b Indicates the width of the material of the spiral spring; h Indicates the thickness of the material of the spiral spring; K represents a second material coefficient of the volute spring; Indicates the expanded length of the spiral spring.

5. The device according to claim 1, characterized in that The elastic member is a scroll spring. When the second support member abuts against the inner surface of the quartz tube, the support force provided by the second support member to the quartz tube satisfies the following expression (4): （4） in, F s represents the supporting force provided by the second supporting member to the quartz tube; R s represents the inner diameter of the quartz tube; Indicates the maximum outer diameter of the scroll spring; E represents the elastic modulus of the material of the scroll spring; b Indicates the width of the material of the spiral spring; h Indicates the thickness of the material of the spiral spring; K represents a second material coefficient of the volute spring; Indicates the expanded length of the spiral spring.

6. The device according to any one of claims 1 to 5, characterized in that One end of the first support member forms a free end, the other end of the first support member is connected to one end of the connecting member, the other end of the connecting member is connected to one end of the second support member, and the other end of the second support member forms a free end. Furthermore, the first supporting member, the second supporting member and the connecting member are integrally formed.

7. A device for performing high temperature oxidation test on cladding, characterized in that: It includes: a quartz tube, wherein the cladding is disposed within the quartz tube; a heating element, the heating element being arranged outside the quartz tube and being used for heating the cladding; a temperature measuring element, the temperature measuring element being arranged inside the quartz tube and outside the cladding, and being used to measure the temperature of the cladding; The device according to any one of claims 1 to 6 is used to fix the temperature measuring element to the outside of the enclosure.

8. A device for performing high temperature oxidation test on cladding, characterized in that: It includes: a quartz tube, wherein the cladding is disposed within the quartz tube; a heating element, the heating element being arranged outside the quartz tube and being used for heating the cladding; a temperature measuring element, the temperature measuring element being arranged inside the quartz tube and outside the cladding, and being used to measure the temperature of the cladding; a device for fixing the cladding and the quartz tube, configured to fix the cladding inside the quartz tube; And, the device according to any one of claims 1 to 6 is used to fix the temperature measuring element to the outside of the enclosure.

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