Constant-temperature clamp for calibration test of graphene film thermocouple
By designing a constant temperature fixture for graphene film thermocouple calibration test, the cooperation of constant temperature parts and magnets is used to ensure that both sides of the graphene film thermocouple are fully in contact, solving the problem of large errors in calibration results, and improving the accuracy of calibration results and anti-environmental interference capabilities.
Patent Information
- Application Number
- CN202510092102.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-04-25
AI Technical Summary
In the prior art, when the calibration test is performed on graphene film thermocouples, the calibration result error is large, and the graphene film thermocouples are sensitive to environmental changes and lack effective isolation and protection measures, which makes it difficult to eliminate the external environmental impact.
A constant temperature fixture for graphene film thermocouple calibration test is designed, including a shell, the first and second constant temperature parts, magnets and thermal insulation layer. By adjusting the distance between the constant temperature parts and using magnetic suction, the clamping and release of the fixture is achieved, ensuring that the two sides of the graphene film thermocouple are in full contact, and heat loss is reduced through the thermal insulation layer.
With this constant temperature fixture, the output signal error can be reduced, the calibration result can be improved, the external environment interference can be reduced, the cold end temperature can be constant, and the signal extraction process can be simplified.
Smart Images
Figure CN119880198A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of thin film thermocouple calibration testing, and in particular to a constant temperature fixture for graphene thin film thermocouple calibration testing. Background Art
[0002] Thin film thermocouples are a type of sensor widely used for high-precision temperature measurement. Since thin film sensors are non-standard temperature measuring devices, in order to accurately measure transient temperature changes, in the process of developing thin film sensors, it is necessary to evaluate their ability to accurately obtain the temperature of the measuring point, that is, to calibrate the thin film thermocouple. Thermocouple calibration usually uses the standard temperature point comparison method, that is, the graphene thin film thermocouple to be calibrated is placed in a constant temperature bath with a known temperature together with the standard thermocouple, and the temperature accuracy of the thermocouple to be calibrated is determined by comparing their output electromotive force.
[0003] When calibrating a thin-film thermocouple, its cold end and hot end need to be in different temperature fields. However, due to its small size, the thin-film thermocouple must be placed at the mouth of the temperature measurement furnace during calibration. The open environment at the mouth of the furnace makes the temperature field easily affected by the external environment, thus affecting the accuracy of the calibration. At the same time, for graphene thin-film thermocouples, their thermal inertia is low and their structure is fragile. During the calibration process, they are easily affected by changes in the external environment, resulting in increased measurement errors.
[0004] The existing calibration device does not accurately control the cold end temperature and is easily affected by ambient temperature fluctuations, resulting in inaccurate calibration results. Graphene film thermocouples are also very sensitive to environmental changes. Factors such as airflow and radiation will interfere with the calibration process and results. Existing devices lack effective isolation and protection measures and cannot completely eliminate the impact of the external environment. In addition, the signal extraction method of traditional calibration devices is relatively complicated and often requires multiple connections and debugging, which not only increases the difficulty of operation, but may also introduce additional errors. Summary of the invention
[0005] The present application provides a constant temperature fixture for calibration testing of graphene film thermocouples, which is used to solve the problem of large errors in calibration results of calibration testing of graphene film thermocouples in the prior art.
[0006] The present application provides a constant temperature fixture for calibration testing of graphene film thermocouples, comprising: A housing, wherein a receiving cavity is formed inside the housing, and the housing is provided with an inlet communicating with the receiving cavity; A first constant temperature element is disposed in the accommodating cavity; A second thermostatic element is disposed in the accommodating cavity and is disposed opposite to the first thermostatic element. The second thermostatic element can approach or move away from the first thermostatic element along the height direction of the shell; A first magnet connected to the first thermostatic element; The second magnet is connected to the second thermostatic component. The second magnet attracts the first magnet to bring the first thermostatic component and the second thermostatic component closer to each other.
[0007] In one possible design, the isothermal fixture also includes: A first heat insulation layer is disposed in the accommodating cavity and covers a portion of the outer surface of the first thermostatic component; The second heat insulation layer is arranged in the accommodating cavity and covers a part of the outer surface of the second constant temperature component. The outer walls of the first heat insulation layer and the second heat insulation layer are respectively slidably matched with the inner wall of the shell.
[0008] In a possible design, a first groove is formed on the first heat insulation layer, the first magnet is arranged at the bottom of the first groove, the first thermostatic element is arranged at the notch of the first groove, and the first thermostatic element and the first heat insulation layer jointly form a first fixed plane; A second groove is formed on the second heat insulation layer, the second magnet is arranged at the groove bottom of the second groove, the second constant temperature component is arranged at the notch of the second groove, and the second constant temperature component and the second heat insulation layer jointly form a second fixed plane.
[0009] In a possible design, the first thermostatic component and the second thermostatic component are respectively silicone rubber heaters.
[0010] In a possible design, the first thermal insulation layer and the second thermal insulation layer are respectively made of alumina ceramics.
[0011] In a possible design, the first heat insulation layer, the first magnet, and the first constant temperature element are provided with through holes that are connected in sequence, and a signal lead-out needle is provided in the through hole, and the signal lead-out needle includes: A needle sleeve is inserted into the through hole; The needle shaft is arranged in the needle sleeve, and the needle shaft and the inner wall of the needle sleeve are slidably matched; The pressing spring is arranged in the needle sleeve, one end of which is in contact with the bottom of the needle sleeve, and the other end of which is in contact with the needle shaft.
[0012] In a possible design, the thermostatic clamp further includes a temperature control box, which is arranged in the accommodating cavity and located on a side of the first thermostatic component away from the second thermostatic component. A controller is arranged in the temperature control box, and the controller is used to adjust the temperature of the first thermostatic component and the second thermostatic component. The temperature control box and the shell are respectively provided with signal lead-out holes.
[0013] In a possible design, the shell is a cylindrical shell, and the first constant temperature element, the first magnet, the first thermal insulation layer, the second constant temperature element, the second magnet, and the second thermal insulation layer are coaxially arranged.
[0014] In a possible design, the outer wall of the first thermal insulation layer has a convex ring, the inner wall of the shell is provided with an annular groove, a buffer spring is axially arranged in the annular groove, one end of the buffer spring abuts against the convex ring, and the other end abuts against the inner wall of the annular groove.
[0015] In a possible design, a threaded hole is provided on the shell, a screw is passed through the threaded hole, one end of the screw located inside the shell is rotatably connected to the second heat insulation layer, and one end of the screw located outside the shell is provided with a handle; The outer wall of the second heat insulation layer is provided with a sliding block, and the inner wall of the shell is provided with a sliding groove parallel to the axial direction of the screw rod, and the sliding block can move along the sliding groove.
[0016] The beneficial effects of this application are as follows: The thermostatic fixture for calibration and testing of graphene thin film thermocouples of the present application has a first thermostatic component and a second thermostatic component arranged in a shell, and the distance between the first thermostatic component and the second thermostatic component is adjusted to achieve clamping or releasing of the graphene thin film thermocouple. By arranging the first magnet and the second magnet, the magnetic attraction effect is utilized, so that when the distance between the first thermostatic component and the second thermostatic component is reduced to a certain distance, the magnetic attraction force between the first magnet and the second magnet can actively adsorb the first thermostatic component to a position in contact with the graphene thin film thermocouple. In this way, in the process of adjusting the distance between the first thermostatic component and the second thermostatic component, the phenomenon of excessive squeezing of the first thermostatic component and the second thermostatic component can be avoided, thereby ensuring that the two side surfaces of the graphene thin film thermocouple are respectively in full contact with the first thermostatic component and the second thermostatic component to maintain the constant temperature of the cold end of the graphene thin film thermocouple, and the graphene thin film thermocouple will not be excessively squeezed, thereby reducing the output signal error and improving the accuracy of the calibration result. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 A schematic diagram of the internal structure of a constant temperature fixture for graphene film thermocouple calibration testing provided in an embodiment of the present application; Figure 2 A front view of a constant temperature fixture for graphene film thermocouple calibration testing provided in an embodiment of the present application; Figure 3 A side view of a constant temperature fixture for calibration testing of graphene film thermocouples provided in an embodiment of the present application; Figure 4A schematic diagram of the structure of a signal lead-out pin of a constant temperature fixture for graphene film thermocouple calibration testing provided in an embodiment of the present application; Figure 5 A schematic diagram of the partial structure of a constant temperature fixture for calibration testing of graphene film thermocouples provided in an embodiment of the present application.
[0019] Reference numerals: 100, shell; 110, accommodating cavity; 120, insertion port; 130, annular groove; 210, first constant temperature component; 220, second constant temperature component; 310, first magnet; 320, second magnet; 410, first thermal insulation layer; 411, first groove; 412, convex ring; 420, second thermal insulation layer; 421, second groove; 500, signal lead-out needle; 510, needle sleeve; 511, stop edge; 520, needle shaft; 521, guide edge; 530, pressing spring; 600, temperature control box; 610, signal lead-out hole; 700, buffer spring; 810, screw; 820, handle; 830, bearing seat. DETAILED DESCRIPTION
[0020] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0021] Combine the following Figure 1-Figure 5 , describing the constant temperature fixture for graphene film thermocouple calibration test provided in the embodiments of the present application.
[0022] Reference Figure 1 As shown, the thermostatic fixture for calibration and testing of graphene film thermocouples provided in the embodiment of the present application includes a shell 100, a first thermostatic component 210, a second thermostatic component 220, a first magnet 310 and a second magnet 320. Specifically, the shell 100 is a cylindrical shell, and a receiving cavity 110 is formed inside the shell 100. The side wall of the shell 100 is provided with an insertion port 120 connected to the receiving cavity 110, and the graphene film thermocouple to be tested is placed between the first thermostatic component 210 and the second thermostatic component 220 through the insertion port 120. Since the structure of the graphene film thermocouple is relatively fragile, the airflow and vibration of the external environment may affect the performance of the graphene film thermocouple. By setting the shell 100, the influence of the external environment on the environment in the receiving cavity 110 can be reduced.
[0023] The first thermostatic member 210 is a columnar structure, and is disposed at the inner lower end of the accommodating chamber 110. The second thermostatic member 220 is a columnar structure, and is disposed at the inner upper end of the accommodating chamber 110. The second thermostatic member 220 is disposed opposite to the first thermostatic member 210, and the second thermostatic member 220 is located above the first thermostatic member 210. By moving the second thermostatic member 220, the second thermostatic member 220 can be moved along the height direction of the housing 100 to approach / move away from the first thermostatic member 210. When the second thermostatic member 220 moves downward, the distance between the second thermostatic member 220 and the first thermostatic member 210 gradually decreases; when the second thermostatic member 220 moves upward, the distance between the second thermostatic member 220 and the first thermostatic member 210 gradually increases.
[0024] The first magnet 310 is connected to the first thermostatic member 210, and the second magnet 320 is connected to the second thermostatic member 220. The second magnet 320 attracts the first magnet 310 to bring the first thermostatic member 210 and the second thermostatic member 220 closer to each other. In some embodiments, the first magnet 310 is bonded to the lower end of the first thermostatic member 210, and the second magnet 320 is bonded to the upper end of the second thermostatic member 220. The upper end of the first magnet 310 and the lower end of the second magnet 320 have different magnetic poles. In this way, when the second thermostatic member 220 moves down to a certain position, the different magnetic poles generate mutual attraction, and the first magnet 310 is attracted and moves upward to drive the first thermostatic member 210 to move upward until the first thermostatic member 210 contacts the graphene film thermocouple in the middle, so that the graphene film thermocouple is clamped by the first thermostatic member 210 and the second thermostatic member 220.
[0025] By utilizing the technical solution provided in the above embodiment, the first thermostat 210 can be actively adsorbed to a position in contact with the graphene film thermocouple by utilizing the magnetic attraction force between the first magnet 310 and the second magnet 320. In this way, in the process of adjusting the distance between the first thermostat 210 and the second thermostat 220, the phenomenon of excessive squeezing of the first thermostat 210 and the second thermostat 220 can be avoided, thereby ensuring that the two side surfaces of the graphene film thermocouple are in full contact with the first thermostat 210 and the second thermostat 220, respectively, so as to maintain the constant temperature of the cold end of the graphene film thermocouple, and the graphene film thermocouple will not be excessively squeezed, thereby reducing the output signal error and improving the accuracy of the calibration result.
[0026] Reference Figure 1As shown, in some embodiments provided in the present application, the thermostatic clamp further includes a first thermal insulation layer 410 and a second thermal insulation layer 420, both of which are disposed in the accommodating cavity 110, and the first thermal insulation layer 410 and the second thermal insulation layer 420 are respectively in a columnar structure, the outer wall of the first thermal insulation layer 410 is slidably matched with the inner wall of the shell 100, and the first thermal insulation layer 410 is coated on the outer surface of the first thermostatic component 210 except for the contact with the graphene film thermocouple; the outer wall of the second thermal insulation layer 420 is slidably matched with the inner wall of the shell 100, and the second thermal insulation layer 420 is coated on the outer surface of the second thermostatic component 220 except for the contact with the graphene film thermocouple. By providing the first thermal insulation layer 410 and the second thermal insulation layer 420, the heat loss of the first thermostatic component 210 and the second thermostatic component 220 can be reduced, and the stability of the temperature field can be ensured.
[0027] In some specific embodiments, the shell 100 is a cylindrical shell, and the first constant temperature element 210, the first magnet 310, the first thermal insulation layer 410, the second constant temperature element 220, the second magnet 320, and the second thermal insulation layer 420 are respectively cylindrical structures and are coaxially arranged.
[0028] Specifically, a first groove 411 is provided at the center of the upper end surface of the first thermal insulation layer 410, the first magnet 310 is embedded in the bottom of the first groove 411, the first thermostat 210 is embedded in the notch of the first groove 411, the upper end surface of the first thermostat 210 is flush with the upper end surface of the first thermal insulation layer 410, and together they form a first fixed plane. A second groove 421 is provided at the center of the lower end surface of the second thermal insulation layer 420, the second magnet 320 is embedded in the bottom of the second groove 421, the second thermostat 220 is embedded in the notch of the second groove 421, the lower end surface of the second thermostat 220 is flush with the lower end surface of the second thermal insulation layer 420, and together they form a second fixed plane. The graphene film thermocouple to be tested is placed between the first fixed plane and the second fixed plane. In this way, the coaxial setting can ensure the uniformity of the temperature distribution between the first fixed plane and the second fixed plane, which is conducive to maintaining the temperature of the cold end of the graphene film thermocouple constant. In some specific embodiments, the first thermostat 210 and the second thermostat 220 are silicone rubber heaters. The silicone rubber heater can heat up quickly and transfer heat evenly, and its efficient thermal conductivity can reach the required temperature in a short time; and the silicone rubber heater has good flexibility and can fit tightly to the surface of the graphene film thermocouple. The thickness of the silicone rubber heater is usually between 1.5 mm and 3 mm, and the weight is also very light, which can save space in the housing 100, reduce the load, and make the fixture structure more compact.
[0029] In some specific embodiments, the first thermal insulation layer 410 and the second thermal insulation layer 420 are respectively made of alumina ceramics. Alumina ceramics are resistant to high temperatures and have good electrical insulation and thermal stability. At the same time, the surface of alumina ceramics is smooth, which can ensure that the first thermal insulation layer 410 and the second thermal insulation layer 420 can slide smoothly on the inner wall of the housing 100.
[0030] Reference Figure 1-3 As shown, the thermostatic fixture further includes a temperature control box 600, which is arranged in the accommodating cavity 110, located on the side of the first thermostatic element 210 away from the second thermostatic element 220, and the outer surface of the temperature control box 600 is fixed to the inner wall of the shell. A controller is arranged in the temperature control box 600, and the controller receives the temperature signal from the first thermostatic element 210 and the second thermostatic element 220, compares and analyzes it with the set temperature value, and then issues a control instruction according to a preset control strategy. If the temperature is detected to be lower than the set temperature, the controller issues a heating instruction to the first thermostatic element 210 and the second thermostatic element 220, and starts to keep warm when the set temperature is reached, so as to adjust the working state of the first thermostatic element 210 and the second thermostatic element 220, thereby realizing precise control of the temperature. The controller can be a simple thermostat, or a complex programmable logic controller (PLC) or an industrial control computer, etc.
[0031] Reference Figure 1 As shown, in some embodiments provided in the application, the first thermal insulation layer 410, the first magnet 310, and the first constant temperature component 210 are provided with through holes that are connected in sequence. There are two through holes, and each through hole is provided with a signal lead-out needle 500. The two signal lead-out needles 500 jointly lead out signal data such as the electromotive force of the graphene film thermocouple to be measured.
[0032] Reference Figure 4 As shown, each signal lead-out needle 500 includes a needle sleeve 510, a needle shaft 520 and a pressure spring 530. The needle sleeve 510 is embedded in the through hole. The needle sleeve 510 is a cylindrical structure with an open upper end. The upper end of the needle sleeve 510 is provided with a stop edge 511; the needle shaft 520 is arranged in the needle sleeve 510, and the lower end of the needle shaft 520 is provided with a guide edge 521, and the guide edge 521 is slidably matched with the inner wall of the needle sleeve 510; the pressure spring 530 is arranged between the needle sleeve 510 and the needle shaft 520, one end of the pressure spring 530 is in contact with the inner bottom of the needle sleeve 510, and the other end is in contact with the lower end of the needle shaft 520. Under the elastic force of the pressure spring 530, the guide edge 521 can slide upward along the inner wall of the needle sleeve 510 to the stop edge 511.
[0033] In the untested state, the pressing spring 530 pushes the needle shaft 520 upward, so that the guide edge 521 abuts against the stop edge 511. At this time, the upper end of the needle shaft 520 is slightly higher than the upper end surface of the first thermostatic component 210. In the tested state, the first thermostatic component 210 and the second thermostatic component 220 simultaneously press the graphene film thermocouple, and the pressing spring 530 is further compressed. At this time, the upper end of the needle shaft 520 is flush with the upper end surface of the first thermostatic component 210. In this way, under the action of the pressing spring 530, the upper end of the needle shaft 520 can be fully contacted with the graphene film thermocouple, thereby ensuring the stability and reliability of signal data transmission during the test process and improving the accuracy of the calibration results. At the same time, the structure of the signal lead-out needle 500 makes the signal lead-out process simpler and faster, avoiding the operational difficulty and error caused by the traditional complex connection method.
[0034] Signal lead-out holes 610 are respectively provided on the temperature control box 600 and the shell, and the rear end of the needle sleeve 510 can pass through the signal lead-out hole 610 to the outside of the shell 100 to transmit the signal data during the test. Alternatively, a signal transmission line is passed through the signal lead-out hole 610, and the rear end of the needle sleeve 510 is connected to the signal transmission line to transmit the signal data during the test. At the same time, the two signal lead-out needles 500 pass through the temperature control box 600 and the shell, which can prevent the first heat insulation layer 410 from moving circumferentially along the inner wall of the shell.
[0035] Reference Figure 5 As shown, the outer wall of the first heat insulation layer 410 has a convex ring 412, the inner wall of the housing 100 is provided with an annular groove 130, the thickness of the annular groove 130 is greater than the thickness of the convex ring 412, the convex ring 412 is located in the annular groove 130, and a buffer spring 700 is arranged in the annular groove 130, the length direction of the buffer spring 700 is parallel to the height direction of the housing 100, the lower end of the buffer spring 700 abuts against the convex ring 412, and the upper end of the buffer spring 700 abuts against the inner wall of the annular groove 130. In this way, when the second thermostatic element 220 moves down to a certain position, the first magnet 310 is attracted by the second magnet 320 and moves upward to drive the first thermostatic element 210 to move upward, the buffer spring 700 will be squeezed, thereby reducing the speed of the first thermostatic element 210 moving upward, so that the first thermostatic element 210 can slowly contact the graphene film thermocouple to be tested, thereby preventing the graphene film thermocouple from being damaged and causing performance abnormality.
[0036] Reference Figure 1As shown, in some embodiments provided in the present application, a threaded hole is provided at the center of the upper end cover of the housing 100, a screw 810 is passed through the threaded hole, one end of the screw 810 located inside the housing 100 is rotatably connected to the bearing seat 830 on the second thermal insulation layer 420, and one end of the screw 810 located outside the housing 100 is provided with a handle 820. The outer wall of the second thermal insulation layer 420 has a vertical slider, and the inner wall of the housing 100 has a slide groove parallel to the axial direction of the screw 810, that is, a vertical slide groove. When the screw 810 is rotated, the slider is limited in the slide groove, so that the screw 810 can drive the second thermal insulation layer 420 to move up and down.
[0037] Working principle of the constant temperature fixture for graphene film thermocouple calibration test of this application: The graphene film thermocouple to be tested is placed between the first thermostatic component 210 and the second thermostatic component 220 from the insertion port 120 of the housing 100; the screw 810 is rotated to move the second thermostatic component 220 downward to a certain position (the downward movement distance is preset), and mutual attraction begins to be generated between the first magnet 310 and the second magnet 320. When the attraction is greater than the elastic force of the buffer spring 700, the buffer spring 700 is further squeezed, and the first magnet 310 is adsorbed and moves upward, driving the first thermostatic component 2 10 is slowly moved up until the first thermostatic component 210 contacts the graphene film thermocouple in the middle, the graphene film thermocouple is clamped by the first thermostatic component 210 and the second thermostatic component 220, and the upper end of the needle shaft 520 is in full contact with the graphene film thermocouple; during the test, the electromotive force and other signal data of the graphene film thermocouple are transmitted through the needle shaft 520 and the needle sleeve 510; after the test is completed, the screw 810 is rotated to move the second thermostatic component 220 up to the initial position, and the graphene film thermocouple is taken out.
[0038] The constant temperature fixture for graphene film thermocouple calibration test of the present application has at least the following beneficial effects: Improve the ability to resist environmental interference: By designing the housing 100 with the ability to isolate external interference, the influence of environmental factors such as airflow and radiation on the calibration process of the graphene film thermocouple is reduced, thereby improving the stability and accuracy of the measurement.
[0039] Precisely control the cold end temperature: Introduce a more precise cold end temperature control box 600 to ensure that the cold end temperature is constant during the calibration process, so as to reduce the impact of environmental fluctuations on the calibration data and ensure calibration accuracy and consistency.
[0040] Simplify the signal lead-out process: Setting the signal lead-out pin 500 optimizes the signal lead-out structure, reduces the complexity of connection and debugging, thereby reducing the operation steps and improving the work efficiency and accuracy of calibration.
[0041] Prevent the graphene film thermocouple from being over-extruded: The magnetic attraction between the first magnet 310 and the second magnet 320 can actively adsorb the first thermostat 210 to a position in contact with the graphene film thermocouple, thereby ensuring that the graphene film thermocouple will not be over-extruded and that the two side surfaces of the graphene film thermocouple are in full contact with the first thermostat 210 and the second thermostat 220, respectively.
[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0045] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0046] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A constant temperature fixture for graphene film thermocouple calibration test, characterized in that: include: A housing, wherein a receiving cavity is formed inside the housing, and the housing is provided with an inlet communicating with the receiving cavity; A first constant temperature element is disposed in the accommodating cavity; A second thermostatic element, disposed in the accommodating cavity and arranged opposite to the first thermostatic element, wherein the second thermostatic element can be moved closer to or farther from the first thermostatic element along a height direction of the housing; A first magnet connected to the first thermostatic element; The second magnet is connected to the second thermostatic component, and the second magnet attracts the first magnet to bring the first thermostatic component and the second thermostatic component closer to each other.
2. The constant temperature fixture for graphene film thermocouple calibration test according to claim 1, characterized in that: Also includes: A first heat insulation layer is disposed in the accommodating cavity and covers a portion of the outer surface of the first thermostatic component; The second heat insulation layer is arranged in the accommodating cavity and covers a part of the outer surface of the second thermostatic component. The outer walls of the first heat insulation layer and the second heat insulation layer are respectively slidably matched with the inner wall of the shell.
3. The constant temperature fixture for graphene film thermocouple calibration test according to claim 2, characterized in that: A first groove is formed on the first heat-insulating layer, the first magnet is arranged at the bottom of the first groove, the first thermostatic element is arranged at the notch of the first groove, and the first thermostatic element and the first heat-insulating layer jointly form a first fixed plane; The second thermal insulation layer is provided with a second groove, the second magnet is arranged at the groove bottom of the second groove, the second thermostatic component is arranged at the notch of the second groove, and the second thermostatic component and the second thermal insulation layer together form a second fixed plane.
4. The constant temperature fixture for graphene film thermocouple calibration test according to claim 3, characterized in that: The first thermostatic component and the second thermostatic component are respectively silicone rubber heaters.
5. The constant temperature fixture for graphene film thermocouple calibration test according to claim 4, characterized in that: The first heat insulation layer and the second heat insulation layer are respectively made of alumina ceramics.
6. The constant temperature fixture for graphene film thermocouple calibration test according to any one of claims 2 to 5, characterized in that: The first heat insulation layer, the first magnet, and the first constant temperature element are provided with through holes that are connected in sequence, and the through holes are provided with signal lead-out needles, and the signal lead-out needles include: A needle sleeve, inserted into the through hole; A needle shaft is disposed in the needle sleeve, and the needle shaft is slidably matched with the inner wall of the needle sleeve; The pressing spring is arranged in the needle sleeve, one end of which is in contact with the bottom of the needle sleeve, and the other end of which is in contact with the needle shaft.
7. The constant temperature fixture for graphene film thermocouple calibration test according to claim 6, characterized in that: It also includes a temperature control box, which is arranged in the accommodating cavity and located on a side of the first thermostatic component away from the second thermostatic component. The temperature control box is provided with a controller, and the controller is used to adjust the temperature of the first thermostatic component and the second thermostatic component; The temperature control box and the shell are respectively provided with signal lead-out holes.
8. The constant temperature fixture for graphene film thermocouple calibration test according to any one of claims 2 to 5, characterized in that: The shell is a cylindrical shell, and the first constant temperature component, the first magnet, the first thermal insulation layer, the second constant temperature component, the second magnet, and the second thermal insulation layer are coaxially arranged.
9. The constant temperature fixture for graphene film thermocouple calibration test according to any one of claims 2 to 5, characterized in that: The outer wall of the first heat insulation layer has a convex ring, the inner wall of the shell is provided with an annular groove, a buffer spring is axially arranged in the annular groove, one end of the buffer spring abuts against the convex ring, and the other end abuts against the inner wall of the annular groove.
10. The constant temperature fixture for graphene film thermocouple calibration test according to any one of claims 2 to 5, characterized in that: The shell is provided with a threaded hole, a screw is passed through the threaded hole, one end of the screw located inside the shell is rotatably connected to the second heat insulation layer, and one end of the screw located outside the shell is provided with a handle; The outer wall of the second heat insulation layer is provided with a sliding block, and the inner wall of the shell is provided with a sliding groove parallel to the axial direction of the screw rod, and the sliding block can move along the sliding groove.