Testing device and method for determining Curie point of magnetic temperature-sensitive alloy and relation between temperature and magnetic force of magnetic temperature-sensitive alloy by adopting testing device

Abstract

The embodiment of the invention relates to the technical field of testing of nuclear facilities in a nuclear reactor, in particular to a testing device and a method for determining the Curie point of a magnetic temperature sensitive alloy and the relation between the temperature and the magnetic force of the magnetic temperature sensitive alloy through the testing device. On one hand, the invention provides a test device. On the second aspect, the invention provides a method for determining the Curie point of the magnetic temperature-sensitive alloy, and the method adopts the device of any embodiment in the first aspect of the invention. In the third aspect, the invention provides a method for determining the relationship between the temperature and the magnetic force of the magnetic temperature-sensitive alloy, and the method adopts the device of any embodiment in the first aspect of the invention. According to the device and the method provided by the embodiment of the invention, the Curie point of the magnetic temperature-sensitive alloy and the relationship between the magnetic force and the temperature can be accurately tested, so that the rod falling response time of a control rod of a shutdown system adopting the magnetic temperature-sensitive alloy is ensured to meet a preset requirement, and rapid and safe shutdown is realized.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of testing nuclear facilities in nuclear reactors, and in particular to a test device and a method for determining the Curie point of a magnetic temperature-sensitive alloy and the relationship between its temperature and magnetism using the test device. Background Art

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

[0003] The Curie point passive shutdown system of a nuclear reactor achieves passive shutdown by utilizing the property that a magnetic temperature sensitive alloy loses its magnetism at the Curie point temperature. Specifically, a control rod is connected to the magnetic temperature sensitive alloy. When the temperature inside the reactor is higher than the Curie point of the magnetic temperature sensitive alloy, the control rod connected to the alloy falls under the action of gravity, thereby achieving a safe shutdown.

[0004] In nuclear reactors that use a Curie point passive shutdown system, the sensitivity of the shutdown system is the determining factor in ensuring a safe shutdown. When the sensitivity of the shutdown system is poor, the control rod drop response time is long, which is not conducive to a rapid and safe shutdown and may result in a serious safety accident. Summary of the invention

[0005] A brief overview of the present application is provided below in order 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 the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] In a first aspect, an embodiment of the present application provides a test device for testing the relationship between the magnetic force and temperature of a magnetic temperature-sensitive alloy, the test device comprising: an electromagnet, the electromagnet being configured to generate or not generate a magnetic force between the electromagnet and the magnetic temperature-sensitive alloy by changing its position; a test container, the magnetic temperature-sensitive alloy and the electromagnet being arranged in the test container; a heating element, the heating element being arranged in the test container, and being configured to heat the area where the magnetic temperature-sensitive alloy and the electromagnet are located; a temperature measuring element, the temperature measuring element being arranged in the area where the magnetic temperature-sensitive alloy and the electromagnet are located, and measuring the temperature of the area; a heat insulating element, the heat insulating element being arranged in the test container and being arranged outside the area where the magnetic temperature-sensitive alloy and the electromagnet are located; a cooling element, the cooling element being arranged in the test container and being arranged outside the heat insulating element, and cooling the area in the test container outside the area where the magnetic temperature-sensitive alloy and the electromagnet are located; a counterweight, the counterweight being arranged outside the test container and being configured to increase the falling weight of the magnetic temperature-sensitive alloy; and a force-applying force-measuring element, the force-applying force-measuring element being configured to apply a force to the magnetic temperature-sensitive alloy and measure the magnitude of the applied force.

[0007] In a second aspect, an embodiment of the present application provides a method for determining the Curie point of a magnetic temperature-sensitive alloy. The method adopts the device of any embodiment of the first aspect of the present application, and comprises the following steps: S0, evacuating the magnetic temperature-sensitive alloy and filling it with an inert gas; S2, moving the position of the electromagnet so that the electromagnet adsorbs the magnetic temperature-sensitive alloy; S4, heating the magnetic temperature-sensitive alloy until the magnetic temperature-sensitive alloy loses contact with the electromagnet, and determining the temperature at this time, which is the Curie point of the magnetic temperature-sensitive alloy.

[0008] In a third aspect, an embodiment of the present application provides a method for determining the relationship between the temperature and magnetic force of a magnetic temperature-sensitive alloy. The method adopts the device of any embodiment of the first aspect of the present application, and comprises the following steps: S0, evacuating the magnetic temperature-sensitive alloy and filling it with an inert gas; S2, moving the position of the electromagnet so that the electromagnet adsorbs the magnetic temperature-sensitive alloy; S4, heating the magnetic temperature-sensitive alloy to a predetermined temperature and stopping heating; S6, applying a force to separate the magnetic temperature-sensitive alloy from the electromagnet until the magnetic temperature-sensitive alloy loses contact with the electromagnet, and determining the applied force; S8, changing the predetermined heating temperature, repeating steps S2-S6, and determining the force that separates the magnetic temperature-sensitive alloy from the electromagnet at different temperatures.

[0009] By using the test device provided in the embodiment of the present application and the method for determining the Curie point of a magnetic temperature sensitive alloy and the relationship between its temperature and magnetism by using the test device, it is possible to accurately test the Curie point of the magnetic temperature sensitive alloy and the relationship between its magnetism and temperature before the magnetic temperature sensitive alloy is applied to a shutdown system, thereby ensuring that the control rod drop response time of the shutdown system using the magnetic temperature sensitive alloy meets predetermined requirements, thereby achieving a rapid and safe shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0011] Figure 1 It is a schematic diagram of the structure of a test device according to an embodiment of the present application.

[0012] Description of reference numerals:

[0013] 1. Magnetic temperature sensitive alloy; 10. Electromagnet; 20. Test container; 21. Cylinder; 22. First flange; 23. Second flange; 30. Heating element; 40. Temperature measuring element; 50. Heat insulating element; 60. Cooling element; 70. Counterweight element; 80. Force-applying and force-measuring element; 90. Driving element; 100. First connecting element; 110. Second connecting element; 120. Observing element; 130. Vacuuming pipe fittings; 140. Inert gas pipe fittings; 150. Buffer element; 151. Elastic part; 152. Platform; 160. Recording element; 170. Support element.

[0014] 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. DETAILED DESCRIPTION

[0015] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation 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 from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0016] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0017] The inventors of the present application have discovered that the sensitivity of the Curie point passive shutdown system is determined by the inherent characteristics of the magnetic temperature sensitive alloy. Therefore, before applying the magnetic temperature sensitive alloy to the shutdown system, it is necessary to determine the relationship between the magnetic force and temperature of the magnetic temperature sensitive alloy to determine whether it can meet the high sensitivity requirements of the shutdown system to avoid the occurrence of serious safety accidents.

[0018] Based on this, an embodiment of the present application provides a test device for testing the relationship between the magnetic force and temperature of a magnetic temperature sensitive alloy, such as Figure 1 As shown, Figure 1 The schematic diagram of the structure of a test device of an embodiment of the present application is shown, and the test device includes: an electromagnet 10, the electromagnet 10 is configured to generate magnetic force or not generate magnetic force between the electromagnet 10 and the magnetic temperature-sensitive alloy 1 by changing its position; a test container 20, the magnetic temperature-sensitive alloy 1 and the electromagnet 10 are arranged in the test container 20; a heating element 30, the heating element 30 is arranged in the test container 20, and is configured to heat the area where the magnetic temperature-sensitive alloy 1 and the electromagnet 10 are located; a temperature measuring element 40, the temperature measuring element 40 is arranged in the area where the magnetic temperature-sensitive alloy 1 and the electromagnet 10 are located, and measures the temperature of the area measurement; a heat insulating member 50, which is disposed in the test container 20 and outside the area where the magnetic temperature sensitive alloy 1 and the electromagnet 10 are located; a cooling member 60, which is disposed in the test container 20 and outside the heat insulating member 50, to cool the area in the test container 20 outside the area where the magnetic temperature sensitive alloy 1 and the electromagnet 10 are located; a counterweight member 70, which is disposed outside the test container 20 and is configured to increase the falling weight of the magnetic temperature sensitive alloy 1; a force-applying force-measuring member 80, which is configured to apply a force to the magnetic temperature sensitive alloy 1 and measure the magnitude of the applied force.

[0019] The test device provided in the embodiment of the present application generates magnetic force or no magnetic force between the electromagnet 10 and the magnetic temperature sensitive alloy 1, performs temperature control under the action of the heating element 30 and the temperature measuring element 40, and uses the counterweight 70 to simulate the real weight of the control rod in the reactor, and uses the force-applying and measuring element 80 to measure the magnitude of the force applied to the magnetic temperature sensitive alloy 1, so as to accurately test the relationship between the magnetic force and the temperature of the magnetic temperature sensitive alloy 1, thereby ensuring that the Curie point passive shutdown system using the magnetic temperature sensitive alloy 1 has a control rod drop response time that meets the predetermined requirements, thereby achieving a rapid and safe shutdown.

[0020] In some embodiments, the test device further includes a driving member 90 and a first connecting member 100, wherein the driving member 90 is disposed outside the test container 20 and is configured to drive the first connecting member 100; the first connecting member 100 extends into the test container 20 and is connected to the electromagnet 10 to drive the electromagnet 10 to move along the direction in which the first connecting member 100 extends, so that the electromagnet 10 is close to the magnetic temperature-sensitive alloy 1 or away from the magnetic temperature-sensitive alloy 1, so as to generate or not generate magnetic force on the magnetic temperature-sensitive alloy 1, that is, to make the electromagnet 10 adsorb or not adsorb the magnetic temperature-sensitive alloy 1. By way of example, the driving member 90 may be a driving motor.

[0021] In some embodiments, the test device further includes: a second connecting member 110, one end of the second connecting member 110 is configured to extend into the test container 20 and be connected to the magnetic temperature-sensitive alloy 1, and the other end of the second connecting member 110 is configured to extend out of the test container 20 and be connected to the force-applying and force-measuring member 80. In this embodiment, the second connecting member 110 is provided so that the magnetic temperature-sensitive alloy 1 can fall along the second connecting member 110, and the magnetic temperature-sensitive alloy 1 is connected to the force-applying and force-measuring member 80, so that the force-applying and force-measuring member 80 can apply force to the magnetic temperature-sensitive alloy 1 through the second connecting member 110 and measure the magnitude of the applied force.

[0022] Preferably, the test container 20, the first connecting member 100 and the second connecting member 110 may be made of weakly magnetic stainless steel to avoid interference with the test due to the use of magnetic materials, thereby affecting the test results.

[0023] In some embodiments, the test container 20 includes a cylinder 21, a first flange 22 and a second flange 23, the cylinder 21, the first flange 22 and the second flange 23 form a cavity of the test container 20, and the magnetic temperature-sensitive alloy 1 and the electromagnet 10 are arranged in the cavity; the cooling member 60 is arranged close to the cylinder 21 to cool the area outside the area where the magnetic temperature-sensitive alloy 1 and the electromagnet 10 are located in the cavity.

[0024] The cooling element 60 may be configured as a coil structure, and water cooling is used to cool the area in the cavity other than the area where the magnetic temperature sensitive alloy 1 and the electromagnet 10 are located. The cooling medium may be deionized water.

[0025] The first flange 22 is provided with a first penetration piece, the second flange 23 is provided with a second penetration piece, the first connection piece 100 extends from the inside of the test container 20 to the outside through the first penetration piece, and the second connection piece 110 extends from the inside of the test container 20 to the outside through the second penetration piece, so as to ensure the sealing of the test container 20. Flexible graphite fillers are used to seal between the first flange 22 and the first penetration piece and between the second flange 23 and the second penetration piece to further ensure the sealing of the test container 20.

[0026] In some embodiments, the temperature measuring member 40 extends through the cylinder 21 and the heat insulating member 50 to measure the temperature of the area where the magnetic temperature-sensitive alloy 1 and the electromagnet 10 are located.

[0027] Furthermore, the temperature measuring member 40 extends through the heating member 30 and is arranged as close as possible to the magnetic temperature sensitive alloy 1 and the electromagnet 10 to improve the accuracy of the measurement result. In addition, the temperature measuring member 40 can be arranged in multiple, such as a thermocouple bundle, etc., so as to further improve the accuracy of the final regional temperature value obtained by integrating the measurement results of multiple temperature measuring members 40.

[0028] The cylinder 21 is provided with a temperature measuring component 40 penetration interface. The temperature measuring component 40 penetrates the cylinder 21 through the temperature measuring component 40 penetration interface and extends toward the inside of the cylinder 21 , penetrating the heat insulating component 50 and the heating component 30 .

[0029] The heating method of the heating element 30 is set to mainly use radiation heat transfer, supplemented by conduction and convection heat transfer, so that the magnetic temperature sensitive alloy 1 and the electromagnet 10 are heated more evenly.

[0030] In some embodiments, the test device also includes an observation piece 120, which is installed on the cylinder 21, and the installation position of the observation piece 120 is set to be able to observe the adsorption position of the electromagnet 10 and the magnetic temperature-sensitive alloy 1, so as to observe the adsorption situation of the electromagnet 10 and the magnetic temperature-sensitive alloy 1 in real time through the observation piece 120.

[0031] The observation member 120 divides the cooling member 60 into two groups, which are respectively disposed on both sides of the observation member 120 .

[0032] In some embodiments, the test device further includes a video recording device 160, which is disposed outside the cylinder 21 and is configured to record the test process in the cylinder 21 through the observation device 120, so as to facilitate long-term recording of the test, thereby eliminating the need for test personnel to conduct long-term real-time observation on site. For example, the video recording device 160 can be a camera, etc.

[0033] In some embodiments, the test device also includes a vacuum pipe fitting 130 and an inert gas pipe fitting 140, and the vacuum pipe fitting 130 and the inert gas pipe fitting 140 are respectively arranged in the test container 20; the test container 20 is vacuumed through the vacuum pipe fitting 130, and inert gas is input into the test container 20 through the inert gas pipe fitting 140.

[0034] The vacuum pipe 130 and the inert gas pipe 140 penetrate the first flange 22 and extend into the cylinder 21 , so that the cylinder 21 can be vacuumed through the vacuum pipe 130 and inert gas can be introduced into the cylinder 21 through the inert gas pipe 140 .

[0035] In some embodiments, the test device further includes a buffer 150, which is disposed outside the test container 20 and between the magnetic temperature sensitive alloy 1 and the force-applying and measuring member 80, so as to reduce the impact of the magnetic temperature sensitive alloy 1 on the force-applying and measuring member 80 when it falls.

[0036] The buffer 150 includes an elastic part 151 and a platform 152. The elastic part 151 is disposed on the platform 152 so that the magnetic temperature sensitive alloy 1 can first fall on the elastic part 151, and then fall on the platform 152 after being damped by the elastic part 151. For example, the elastic part 151 can be a damping spring.

[0037] In some embodiments, the test device further includes a support member 170, which is fixedly disposed on the outer wall of the cylinder 21 of the test container 20, so that the test container 20 is supported on an external mechanism through the support member 170, and a buffer structure, such as a rubber buffer pad, is provided between the support member 170 and the external mechanism. For example, the support member 170 can be configured as an ear-type support.

[0038] The embodiment of the present application further provides a method for determining the Curie point of a magnetic temperature-sensitive alloy, the method using the test device in any embodiment of the first aspect of the present application, and comprising the following steps:

[0039] S0: The area where the magnetic temperature sensitive alloy is located is evacuated and filled with inert gas.

[0040] S2: Move the position of the electromagnet so that the electromagnet absorbs the magnetic temperature sensitive alloy.

[0041] S4: heating the magnetic temperature sensitive alloy until the magnetic temperature sensitive alloy is out of contact with the electromagnet, and determining the temperature at this time, which is the Curie point of the magnetic temperature sensitive alloy.

[0042] The method provided in the embodiment of the present application accurately determines the Curie point of the magnetic temperature sensitive alloy to determine at which temperature the magnetic temperature sensitive alloy loses its magnetism, thereby testing whether the magnetic temperature sensitive alloy can meet the high sensitivity requirements of the Curie point type passive shutdown system, ensuring that the shutdown system can achieve rapid and safe shutdown.

[0043] In some embodiments, step S0 may be repeated multiple times to ensure that the gas in the area where the magnetic temperature-sensitive alloy is located is completely replaced, thereby improving the test accuracy.

[0044] In some embodiments, before step S4, the method further comprises the following steps:

[0045] S3: heating the magnetic temperature sensitive alloy and measuring the temperature of the space where the magnetic temperature sensitive alloy is located. The heating time is continued until, within a predetermined time, the measured temperature of the space where the magnetic temperature sensitive alloy is located remains unchanged.

[0046] In this embodiment, before step S4, the space where the magnetic temperature sensitive alloy is located is heated to a thermal equilibrium state to ensure that the measured temperature value can accurately reflect the temperature of the magnetic temperature sensitive alloy, thereby further improving the test accuracy.

[0047] In some embodiments, the following steps are also included:

[0048] S6: Stop heating the magnetic temperature sensitive alloy.

[0049] S7: Repeat S2-S4 and determine the Curie point of the magnetic temperature sensitive alloy.

[0050] S8: Repeat S6-S7 multiple times, and determine the Curie points of multiple magnetic temperature sensitive alloys.

[0051] S9: Determine the average of the plurality of Curie points of the magnetic temperature-sensitive alloy as the final Curie point of the magnetic temperature-sensitive alloy.

[0052] In this embodiment, multiple Curie points of the magnetic temperature sensitive alloy are determined through the above steps, and the average of the multiple Curie points of the magnetic temperature sensitive alloy is determined as the final Curie point of the magnetic temperature sensitive alloy, so as to reduce the influence of the measurement error and improve the accuracy and reliability of the final Curie point of the magnetic temperature sensitive alloy.

[0053] In step S6, the heating of the magnetic temperature sensitive alloy is stopped, and the temperature of the magnetic temperature sensitive alloy is lowered until the magnetic properties are restored, and then steps S2-S4 are repeated.

[0054] The embodiment of the present application also provides a method for determining the relationship between the temperature and the magnetic force of a magnetic temperature-sensitive alloy. The method uses the test device of any embodiment of the first aspect of the present application, and comprises the following steps:

[0055] S0: The area where the magnetic temperature sensitive alloy is located is evacuated and filled with inert gas.

[0056] S2: Move the position of the electromagnet so that the electromagnet absorbs the magnetic temperature sensitive alloy.

[0057] S4: The magnetic temperature sensitive alloy is heated to a predetermined temperature and then the heating is stopped.

[0058] S6: applying a force to separate the magnetic temperature sensitive alloy from the electromagnet until the magnetic temperature sensitive alloy loses contact with the electromagnet, and determining the applied force.

[0059] S8: Changing the predetermined heating temperature, repeating steps S2-S6, and determining the force that separates the magnetic temperature-sensitive alloy from the electromagnet at different temperatures.

[0060] The method provided in the embodiment of the present application obtains the relationship between the magnetic force and temperature of the magnetic temperature sensitive alloy by determining the force of separation of the magnetic temperature sensitive alloy and the electromagnet at different temperatures, so as to further verify whether the magnetic temperature sensitive alloy can meet the high sensitivity requirements of the Curie point passive shutdown system, thereby ensuring that the shutdown system can achieve rapid and safe shutdown.

[0061] In some embodiments, before step S4, the method further comprises the following steps:

[0062] S3: heating the magnetic temperature sensitive alloy and measuring the temperature of the space where the magnetic temperature sensitive alloy is located. The heating time is continued until, within a predetermined time, the measured temperature of the space where the magnetic temperature sensitive alloy is located remains unchanged.

[0063] In this embodiment, before step S4, the space where the magnetic temperature sensitive alloy is located is heated to a thermal equilibrium state to ensure that the measured temperature value can accurately reflect the temperature of the magnetic temperature sensitive alloy, thereby further improving the test accuracy.

[0064] In some embodiments, in step S4, the predetermined temperature can be set to be lower than the Curie point of the magnetic temperature sensitive alloy to prevent the magnetic temperature sensitive alloy from losing magnetism and being out of contact with the electromagnet. Preferably, the predetermined temperature can be set to be 30° C. lower than the Curie point of the magnetic temperature sensitive alloy.

[0065] In some embodiments, before step S8, the following steps are also included:

[0066] S7: Stop heating for a predetermined time until the magnetic temperature sensitive alloy recovers its magnetism.

[0067] In this embodiment, before step S8, the heating is stopped for a predetermined time to allow the magnetic temperature sensitive alloy to cool until the magnetism is restored, and then the predetermined heating temperature is changed to repeat steps S2-S6, so as to avoid inaccurate test results caused by reheating the magnetic temperature sensitive alloy after it has not been completely cooled, thereby further improving the test accuracy.

[0068] In some embodiments, step S8 can be repeated multiple times, and, in step S8, when the predetermined heating temperature is changed and steps S2-S6 are repeated, the predetermined heating temperature can be set slightly higher than the predetermined temperature in step S4 according to the predetermined temperature of the first repetition, and each subsequent repetition can be set slightly higher than the previous predetermined temperature until the predetermined temperature rises to the Curie point of the magnetic temperature-sensitive alloy and the repetition is stopped, so as to determine the force separating the magnetic temperature-sensitive alloy from the electromagnet at different temperatures.

[0069] Preferably, the predetermined temperature of the first repetition can be set to be within 5° C. higher than the predetermined temperature in step S4, and the predetermined temperature of each subsequent repetition can be set to be within 5° C. higher than the previous predetermined temperature.

[0070] The following is a specific example to further illustrate the process of using the test device in the present application to determine the Curie point of the magnetic temperature-sensitive alloy 1 and the relationship between its temperature and magnetic force.

[0071] In this embodiment, Fe-Co-Ni base alloy is used as the magnetic temperature sensitive alloy.

[0072] Step 1: evacuate the test container 20 through the vacuum pipe 130, and input inert gas into the test container 20 through the inert gas pipe 140. After repeating the operation 4-5 times, input an appropriate amount of inert gas into the test container 20; start the video recording device 160 to record the test process.

[0073] Step 2: Start the driving member 90, and use the driving member 90 to drive the first connecting member 100, so that the first connecting member 100 drives the electromagnet 10 to move 600 mm, so that the electromagnet 10 adsorbs the magnetic temperature sensitive alloy 1; start the cooling member 60, and use the cooling member 60 to cool the area outside the area where the magnetic temperature sensitive alloy 1 and the electromagnet 10 are located in the test container 20; according to the predetermined heating power, use the heating member 30 to heat the area where the magnetic temperature sensitive alloy 1 and the electromagnet 10 are located, and use multiple temperature measuring members 40 to measure the temperature of the area where the magnetic temperature sensitive alloy is located. When the temperature values ​​measured by the multiple temperature measuring members 40 tend to be consistent and remain unchanged within a predetermined time, the test container 20 reaches a thermal equilibrium state, and the heating is stopped at this time; adjust the heating power of the heating member 30, continue to heat the magnetic temperature sensitive alloy 1, until the magnetic temperature sensitive alloy 1 is out of contact with the electromagnet 10, and determine that the average value of the temperature measured by the multiple temperature measuring members 40 at this time is the Curie point of the magnetic temperature sensitive alloy 1.

[0074] Step 3: stop heating the magnetic temperature sensitive alloy 1 to reduce the temperature of the magnetic temperature sensitive alloy 1 to restore its magnetism, and then repeat step 2 to determine the Curie point of the magnetic temperature sensitive alloy 1 again.

[0075] Step 4: Repeat step 3 multiple times to determine multiple Curie points of the magnetic temperature-sensitive alloy 1; determine the average value of the multiple Curie points of the magnetic temperature-sensitive alloy 1, and use the average value as the final Curie point of the magnetic temperature-sensitive alloy 1.

[0076] Step five, start the driving member 90, and use the driving member 90 to drive the first connecting member 100, so that the first connecting member 100 drives the electromagnet 10 to move 600 mm, so that the electromagnet 10 absorbs the magnetic temperature sensitive alloy 1; use the heating member 30 to heat the magnetic temperature sensitive alloy 1 and the area where the electromagnet 10 is located, and use multiple temperature measuring members 40 to measure the temperature of the area where the magnetic temperature sensitive alloy is located. When the temperature values ​​measured by the multiple temperature measuring members 40 tend to be consistent and all reach about 30°C lower than the Curie point of the magnetic temperature sensitive alloy, and the temperature value remains unchanged within a predetermined time, the test container 20 reaches a thermal equilibrium state, and the heating is stopped at this time; use the force-applying force-measuring member 80 to apply a force to separate the magnetic temperature sensitive alloy 1 from the electromagnet 10 until the magnetic temperature sensitive alloy 1 is out of contact with the electromagnet 10, and determine the force applied by the force-applying force-measuring member 80 at this time.

[0077] Step 6, stop heating the magnetic temperature sensitive alloy 1, so that the temperature of the magnetic temperature sensitive alloy 1 drops to the point where its magnetism is restored, then adjust the heating power of the heating element 30, change the predetermined heating temperature, and set the predetermined temperature to be within 5°C higher than the previous heating temperature, and repeat step 5 to determine the force that separates the magnetic temperature sensitive alloy 1 from the electromagnet 10 at the predetermined temperature.

[0078] Step 7, repeating step 6 multiple times until the predetermined temperature rises to the Curie point of the magnetic temperature sensitive alloy 1 and then stopping the repetition, so as to determine the force that separates the magnetic temperature sensitive alloy 1 from the electromagnet 10 at different temperatures, thereby determining the relationship between the temperature and magnetic force of the magnetic temperature sensitive alloy 1.

[0079] 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.

[0080] The above are only specific implementation methods 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 test device for testing the relationship between magnetic force and temperature of a magnetic temperature sensitive alloy, characterized in that: It includes: An electromagnet, wherein the electromagnet is configured to generate or not generate a magnetic force between the electromagnet and the magnetic temperature-sensitive alloy by changing its position; a test container, wherein the magnetic temperature-sensitive alloy and the electromagnet are arranged in the test container; A heating element, the heating element is disposed in the test container and is configured to heat the magnetic temperature sensitive alloy and the area where the electromagnet is located; A temperature measuring piece, which is arranged in the area where the magnetic temperature sensitive alloy and the electromagnet are located, and measures the temperature of the area; A heat insulating member, the heat insulating member is arranged in the test container and outside the area where the magnetic temperature sensitive alloy and the electromagnet are located; A cooling member, which is arranged in the test container and outside the heat insulating member, and cools the magnetic temperature sensitive alloy in the test container and the area outside the area where the electromagnet is located; A counterweight, which is disposed outside the test container and is configured to increase the falling weight of the magnetic temperature-sensitive alloy; A force-applying and force-measuring piece is configured to apply force to the magnetic temperature-sensitive alloy and measure the magnitude of the applied force.

2. The test device according to claim 1, characterized in that: It also includes a driving member and a first connecting member, The driving member is arranged outside the test container, and the driving member is arranged to drive the first connecting member. The first connecting member extends into the test container and is connected to the electromagnet to drive the electromagnet to move along the direction in which the first connecting member extends, so that the electromagnet is close to the magnetic temperature sensitive alloy or away from the magnetic temperature sensitive alloy, so as to generate magnetic force or not generate magnetic force on the magnetic temperature sensitive alloy.

3. The test device according to claim 1, characterized in that: Also includes: a second connecting member, one end of which is configured to extend into the test container and be connected to the magnetic temperature sensitive alloy; The other end of the second connecting member is configured to extend out of the test container and be connected to the force applying and measuring member.

4. The test device according to claim 1, characterized in that: The test container comprises a cylinder, a first flange and a second flange, wherein the cylinder, the first flange and the second flange form a cavity of the test container, and the magnetic temperature sensitive alloy and the electromagnet are arranged in the cavity; The cooling member is arranged close to the cylinder.

5. The test device according to claim 4, characterized in that: The temperature measuring member extends through the cylinder and the heat insulating member.

6. The test device according to claim 4, characterized in that: It also includes an observation piece, which is installed on the cylinder, and the installation position of the observation piece is set to be able to observe the adsorption position of the electromagnet and the magnetic temperature-sensitive alloy.

7. The test device according to claim 1, characterized in that: It also includes a vacuum pipe fitting and an inert gas pipe fitting, wherein the vacuum pipe fitting and the inert gas pipe fitting are respectively arranged in the test container. The test container is subjected to vacuum treatment through the vacuum pipe fitting, An inert gas is introduced into the test container through the inert gas pipe.

8. A method for determining the Curie point of a magnetic temperature-sensitive alloy, characterized in that: The method adopts the device according to any one of claims 1 to 7, and comprises the following steps: S0: evacuating the area where the magnetic temperature sensitive alloy is located and filling it with inert gas; S2: moving the position of the electromagnet so that the electromagnet absorbs the magnetic temperature sensitive alloy; S4: heating the magnetic temperature sensitive alloy until the magnetic temperature sensitive alloy is out of contact with the electromagnet, and determining the temperature at this time, which is the Curie point of the magnetic temperature sensitive alloy.

9. The method according to claim 8, characterized in that Before step S4, the following steps are also included: S3: heating the magnetic temperature sensitive alloy and measuring the temperature of the space where the magnetic temperature sensitive alloy is located, The heating time is continued until the temperature of the space where the magnetic temperature-sensitive alloy is located remains constant within a predetermined time.

10. The method according to claim 9, characterized in that The following steps are also included: S6: stopping heating the magnetic temperature sensitive alloy, S7: repeat S2-S4, and determine the Curie point of the magnetic temperature sensitive alloy; S8: repeating S6-S7 for multiple times, and determining multiple Curie points of the magnetic temperature sensitive alloy; S9: Determine the average of the plurality of Curie points of the magnetic temperature-sensitive alloy as the final Curie point of the magnetic temperature-sensitive alloy.

11. A method for determining the relationship between temperature and magnetic force of a magnetic temperature sensitive alloy, characterized in that: The method adopts the device according to any one of claims 1 to 7, and comprises the following steps: S0: evacuating the area where the magnetic temperature sensitive alloy is located and filling it with inert gas; S2: moving the position of the electromagnet so that the electromagnet absorbs the magnetic temperature sensitive alloy; S4: heating the magnetic temperature sensitive alloy to a predetermined temperature and then stopping the heating; S6: applying a force to separate the magnetic temperature-sensitive alloy from the electromagnet until the magnetic temperature-sensitive alloy loses contact with the electromagnet, and determining the applied force; S8: changing the predetermined heating temperature, repeating steps S2-S6, and determining the force that separates the magnetic temperature-sensitive alloy from the electromagnet at different temperatures.

12. The method according to claim 11, characterized in that Before step S4, the following steps are also included: S3: heating the magnetic temperature sensitive alloy and measuring the temperature of the space where the magnetic temperature sensitive alloy is located, The heating time is continued until the temperature of the space where the magnetic temperature-sensitive alloy is located remains constant within a predetermined time.

13. The method according to claim 11, characterized in that Before step S8, the following steps are also included: S7: Stop heating for a predetermined time until the magnetic temperature sensitive alloy recovers its magnetism.

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