Low temperature surface temperature source for calibration

Abstract

The utility model discloses a low-temperature surface temperature source for calibration, which comprises a surface temperature tool, a micro-channel structure is arranged in the surface temperature tool, a plurality of spoilers are arranged in the micro-channel structure, the spoilers are arranged in the micro-channel structure in a staggered manner, and a standard platinum resistor jack is arranged on the surface temperature tool; the low-temperature liquid thermostatic bath comprises a thermostatic bath main body, a low-temperature liquid medium is arranged in the thermostatic bath main body, and the low-temperature liquid medium is one of ethanol or liquid nitrogen; wherein an inlet and an outlet of the micro-channel structure are respectively connected with the thermostatic bath main body through a quick plug connector, and a low-temperature liquid medium in the thermostatic bath main body flows into the micro-channel structure through the inlet of the micro-channel structure, and flows back to the thermostatic bath main body through the outlet of the micro-channel structure after heat exchange is completed. According to the low-temperature surface temperature source for calibration, a stable low-temperature environment can be provided, and accurate calibration of the surface thermometer at the room temperature or below is achieved.

Description

Technical Field

[0001] This utility model relates to the field of thermal calibration technology. More specifically, this utility model relates to a low-temperature surface temperature source for calibration. Background Technology

[0002] In the field of thermal metrology calibration, the calibration of surface thermometers below room temperature has always faced numerous challenges. Surface thermometers are used to measure the surface temperature of objects, and their accuracy is crucial for many fields such as industrial production and scientific research. However, when calibrating temperatures below room temperature, there is a lack of suitable and high-performance low-temperature surface temperature sources. Existing calibration methods are insufficient in providing a stable low-temperature environment. On the one hand, it is difficult to ensure the uniformity of temperature during the calibration process. Ordinary low-temperature devices have uneven internal temperature distribution and obvious temperature gradients, causing deviations in the temperature measured by the surface thermometer at different locations, making it impossible to obtain accurate and reliable calibration results. This is mainly because the heat conduction structure of the low-temperature device is not designed reasonably, and heat cannot be transferred quickly and evenly, resulting in local temperatures that are too high or too low. On the other hand, the accuracy of temperature control is difficult to meet calibration requirements. Traditional temperature control systems have slow response speeds and are prone to overshoot or undershoot when adjusting the temperature, making it impossible to stabilize the temperature at a specific calibration point. Moreover, the installation position and method of the temperature sensor may not be scientifically sound, failing to accurately reflect the actual temperature of the entire low-temperature environment, further affecting the accuracy of temperature control. Many difficulties have also been encountered in the design of low-temperature surface temperature sources. For example, selecting suitable materials and structural forms is a major challenge when designing structures capable of efficiently transferring low temperatures. Conventional materials have limited thermal conductivity, making it difficult to meet the requirements for rapid and uniform low-temperature conduction. Furthermore, designing a structure that enhances heat exchange efficiency without negatively impacting the stability and reliability of the entire system is no easy task. In addition, while ensuring stability in the low-temperature environment, the convenience and repeatability of calibration operations must also be considered. Some existing cryogenic devices are complex in structure and cumbersome to operate, making it difficult to perform quickly and accurately in different calibration scenarios. Moreover, the results of each calibration may vary significantly, failing to meet the consistency and reliability requirements of practical calibration work. In summary, current low-temperature surface temperature sources for calibrating surface thermometers below room temperature have shortcomings in terms of temperature uniformity, control accuracy, structural design, and ease of operation. There is an urgent need for a low-temperature surface temperature source that can effectively solve these problems to improve the accuracy and reliability of calibrating surface thermometers below room temperature. Summary of the Invention

[0003] This invention provides a low-temperature surface temperature source for calibration, which can provide a stable low-temperature environment to achieve accurate calibration of surface thermometers below room temperature. It solves the problems of existing surface thermometer calibration below room temperature lacking suitable low-temperature surface temperature sources and having poor temperature uniformity and inaccurate control.

[0004] To achieve these objectives and other advantages of this invention, a low-temperature surface temperature source for calibration is provided, comprising:

[0005] A surface temperature fixture has a microchannel structure inside, and multiple baffles are arranged inside the microchannel structure in an alternating manner. A standard platinum resistance socket is provided on the surface temperature fixture.

[0006] A cryogenic liquid constant temperature bath includes a constant temperature bath body, and a cryogenic liquid medium is disposed inside the constant temperature bath body, wherein the cryogenic liquid medium is one of ethanol or liquid nitrogen.

[0007] The inlet and outlet of the microchannel structure are connected to the thermostatic bath body via quick-connect connectors.

[0008] The low-temperature liquid medium inside the thermostatic bath flows into the microchannel structure through the inlet of the microchannel structure, completes heat exchange, and then flows back to the thermostatic bath through the outlet of the microchannel structure.

[0009] Preferably, a heat spreader layer is also embedded inside the surface temperature fixture, the heat spreader layer being located between the microchannel structure and the outer surface of the surface temperature fixture; the standard platinum resistance socket penetrates the surface temperature fixture and is adjacent to the microchannel structure.

[0010] Preferably, an adapter is provided on the upper surface of the surface temperature fixture for connecting the probe of the thermometer being calibrated; wherein a temperature sensor array is provided inside the surface temperature fixture, and the temperature sensor array is electrically connected to the data transmission module.

[0011] Preferably, the microchannel structure is a serpentine continuous channel, and the inlet and outlet of the serpentine continuous channel are respectively connected to the low-temperature liquid medium inside the thermostatic bath.

[0012] Preferably, the cryogenic liquid constant temperature bath further includes a refrigeration system, which is disposed below or on the side of the constant temperature bath body, for cooling the cryogenic liquid medium inside the constant temperature bath body to the required low temperature state.

[0013] A temperature control system includes: a temperature sensor disposed inside the thermostatic bath body; a controller disposed outside the thermostatic bath body and electrically connected to the temperature sensor; and a heating device disposed inside the thermostatic bath body for heating a low-temperature liquid medium.

[0014] A stirring system includes a stirring paddle and a stirring motor. The stirring paddle is disposed inside the body of the constant temperature bath, and the stirring motor is fixed outside the body of the constant temperature bath and connected to the stirring paddle.

[0015] Preferably, the heat spreader is a composite honeycomb structure, wherein the composite honeycomb structure uses copper or aluminum with high thermal conductivity as the honeycomb matrix, and carbon fiber reinforcement is uniformly embedded inside the honeycomb pore wall. The carbon fiber reinforcement is bundled and distributed along the axial direction of the honeycomb pore wall.

[0016] Preferably, the heat spreader is a metal foam material or a nano-aerogel composite material.

[0017] Preferably, the outer surface of the surface temperature fixture is coated with a wear-resistant and corrosion-resistant coating, which includes: a bottom layer, which is an epoxy resin coating layer; a middle layer, which is a polyurethane coating layer filled with ceramic microspheres, wherein the ceramic microspheres are uniformly dispersed in the polyurethane matrix; and an outer layer, which is a fluorocarbon coating layer.

[0018] Preferably, the wear-resistant and corrosion-resistant coating contains dispersed microcapsules, and the microcapsules encapsulate a repair agent composed of resin and curing agent.

[0019] Preferably, the temperature sensor array includes multiple miniature temperature sensors, which are uniformly distributed inside and on the surface of the surface temperature fixture.

[0020] This invention offers at least the following advantages: By incorporating a surface temperature fixture and a cryogenic liquid constant-temperature bath, and further integrating a microchannel structure within the surface temperature fixture via a quick-connect connector that connects to the cryogenic liquid medium inside the constant-temperature bath, the surface temperature fixture maintains a stable low-temperature environment. This allows for the calibration of surface thermometers below room temperature and improves calibration accuracy. The standard platinum resistance socket is adjacent to the microchannel structure, facilitating accurate temperature measurement. The heat spreader layer ensures that the heat transferred by the microchannel structure is more evenly distributed across the fixture surface, further enhancing calibration precision and reducing measurement errors.

[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0022] Figure 1This is a side view of the low-temperature surface temperature source for calibration of this utility model.

[0023] Figure 2 This is a schematic diagram of the microstructure channel of the surface temperature tooling of this utility model;

[0024] Figure 3 This is a schematic diagram of the turbulence plate in the microstructure channel of this utility model. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0026] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0027] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] like Figures 1-3As shown, this utility model provides a low-temperature surface temperature source for calibration, including: a surface temperature fixture 1, which has a microchannel structure 110 inside. Specifically, the microchannel structure 110 can be a serpentine continuous channel. The microchannel structure 110 has multiple baffles 6 inside, which are arranged in an alternating pattern inside the microchannel structure 110. A standard platinum resistance socket 5 is provided on the surface temperature fixture 1; a low-temperature liquid thermostatic bath 2, which includes a thermostatic bath body 210. The thermostatic bath body 210 has a low-temperature liquid medium 4 inside, which is either ethanol or liquid nitrogen. The inlet and outlet of the microchannel structure 110 are connected to the thermostatic bath body 210 through a quick-connect connector 3. The low-temperature liquid medium 4 inside the thermostatic bath body 210 flows into the microchannel structure 110 through the inlet, completes heat exchange, and then flows back to the thermostatic bath body 210 through the outlet of the microchannel structure 110.

[0029] In the above embodiment, a standard platinum resistance socket 5 is provided on the surface temperature fixture 1. The standard platinum resistance is inserted into the socket 5, and real-time temperature data of the surface temperature fixture 1 is obtained by precisely measuring the change in its resistance value with temperature. The surface temperature fixture 1 has a microchannel structure 110 inside, and baffles 6 are arranged alternately within the microchannel structure 110. When the cryogenic liquid medium 4 flows in the microchannel structure 110, the baffles 6 disrupt the flow state of the cryogenic liquid medium 4, increasing the contact area and contact time between the cryogenic liquid medium 4 and the microchannel wall, thereby enhancing heat exchange efficiency. The cryogenic liquid medium 4 flows in from the inlet of the microchannel structure 110. Under the action of the baffles 6, the originally relatively smooth liquid flow is divided and disturbed, allowing the cryogenic liquid medium 4 to more fully exchange heat with the microchannel wall, transferring the low temperature to the surface temperature fixture 1.

[0030] The inlet and outlet of the microchannel structure 110 are connected to the thermostatic bath body 210 via quick-connect connectors 3. One end of the quick-connect connector 3 is fixed to the thermostatic bath body 210, and the other end is fixed to the surface temperature fixture 1. For example, the quick-connect structure can use a quick-connect connector 3 from Colder Products Company (CPC), such as the AQ4, which is specifically designed for liquid transfer, suitable for cryogenic liquids, corrosion-resistant, and low-temperature resistant, and features a self-locking design to prevent accidental disconnection. When connection is required, the surface temperature fixture 1 is aligned with the thermostatic bath body 210, and the locking structure is inserted. The locking mechanism automatically engages, achieving a quick connection. When disassembly is required, the locking mechanism is easily opened by a simple operation (such as pressing the unlock button or pulling the unlocking device), allowing easy separation of the surface temperature fixture 1 and the cryogenic liquid thermostatic bath 2. This quick-installation interface design greatly improves efficiency. In different calibration scenarios, operators can quickly install the surface temperature fixture 1 onto the cryogenic liquid thermostatic bath 2, or quickly disassemble it after calibration, facilitating equipment handling, storage, and maintenance. In specific configuration, two quick-connect connectors 3 are installed on one side of the thermostatic bath body 210, one as a liquid outlet and the other as a liquid inlet. Inside the thermostatic bath body 210, there are a liquid outlet channel 240 and a liquid inlet channel 250. A micro-circulation pump 260 can be installed at the liquid inlet channel. The other ends of the quick-connect connectors 3 are installed at the inlet and outlet of the microchannel structure 110, respectively. The microchannel structure 110 can be positioned below the liquid level of the cryogenic liquid medium 4 in the thermostatic bath body 210. The microchannel structure 110 is a serpentine continuous channel, with its inlet and outlet connected to the cryogenic liquid medium 4 inside the thermostatic bath body 210. This serpentine design increases the flow path and time of the cryogenic liquid medium 4 within the surface temperature fixture 1. When the cryogenic liquid medium 4 flows from the thermostatic bath body 210 into the serpentine continuous channel through the inlet, the serpentine shape of the channel requires the cryogenic liquid medium 4 to flow along a curved path. This increases the contact area and contact time with the microchannel wall, resulting in more thorough heat exchange. After completing the heat exchange, the cryogenic liquid can smoothly flow back to the thermostatic bath body 210 through the outlet, forming a continuous cycle. It should be noted that since the surface temperature fixture is located on one side of the cryogenic liquid thermostatic bath, a support frame can also be installed below the surface temperature fixture; this embodiment does not impose specific limitations on this.

[0031] In one specific embodiment, a heat spreader layer 120 is also embedded inside the surface temperature fixture 1, the heat spreader layer 120 being located between the microchannel structure 110 and the outer surface of the surface temperature fixture 1; the standard platinum resistance jack 5 penetrates the surface temperature fixture 1 and is adjacent to the microchannel structure 110.

[0032] In the above embodiment, the standard platinum resistance socket 5 penetrates the surface temperature fixture 1 and is adjacent to the microchannel structure 110. This layout design allows the standard platinum resistance to more accurately measure the temperature near the microchannel structure 110, because the microchannel structure 110 is a key area for heat exchange of the cryogenic liquid, and the temperature near it is more representative of the temperature range that the surface temperature fixture 1 is actually used for calibration. For example, when the cryogenic liquid flows in the microchannel structure 110, the standard platinum resistance can promptly sense changes in the wall temperature of the microchannel structure 110, reducing measurement errors.

[0033] A heat spreader layer 120 is embedded inside the surface temperature fixture 1, located between the microchannel structure 110 and the outer surface of the surface temperature fixture 1. The function of the heat spreader layer 120 is to more evenly diffuse the heat transferred from the microchannel structure 110 onto the surface of the surface temperature fixture 1. When the cryogenic liquid in the microchannel structure 110 exchanges heat with the wall of the microchannel structure 110, the heat is transferred to the heat spreader layer 120. The heat spreader layer 120 can evenly distribute this heat inside the surface temperature fixture 1, avoiding localized excessively high or low temperatures. For example, without the heat spreader layer 120, the temperature near the microchannel structure 110 might be significantly lower than other parts of the surface temperature fixture 1, resulting in inconsistent temperatures measured by the calibrated thermometer at different locations during calibration. Therefore, the heat spreader layer 120 makes the surface temperature of the surface temperature fixture 1 more uniform, improving the accuracy of calibration.

[0034] In actual manufacturing and use, when processing the surface temperature fixture 1, the position of the standard platinum resistance socket 5 is reserved to ensure that it penetrates the fixture and is adjacent to the microchannel structure 110. For example, it can be set at the edge of the surface temperature fixture 1. When embedding the heat spreader 120 inside the surface temperature fixture 1, it is necessary to ensure that the installation position of the heat spreader 120 is accurate and that it is tightly attached to the microchannel structure 110 and the outer surface of the surface temperature fixture 1 to achieve good heat conduction. In use, after the low-temperature liquid medium 4 flows in the microchannel structure 110 for heat exchange, the heat spreader 120 begins to function, uniformly dispersing the heat. The standard platinum resistance measures the temperature near the microchannel structure 110 in real time, providing a more accurate temperature reference for the calibration of the surface thermometer and further improving the accuracy of the calibration.

[0035] In one specific embodiment, an adapter 130 is provided on the upper surface of the surface temperature fixture 1 for connecting the probe of the thermometer to be calibrated; wherein, a temperature sensor array is provided inside the surface temperature fixture 1, and the temperature sensor array is electrically connected to the data transmission module. The temperature sensor array includes multiple miniature temperature sensors, which are uniformly distributed inside and on the surface of the surface temperature fixture 1.

[0036] In the above embodiment, the surface temperature fixture 1 is provided with an adapter 130, which connects to the probe of the thermometer being calibrated. The adapter 130 is designed to ensure that the probe of the thermometer being calibrated is securely connected to the surface of the surface temperature fixture 1, guaranteeing the accuracy of the measurement position. For example, different models of surface thermometer probes may have different sizes and shapes. The adapter 130 can be designed according to common probe specifications and has multiple adapter interfaces to ensure that the thermometer being calibrated can be accurately installed in the calibration position, avoiding measurement errors caused by probe shaking or improper installation.

[0037] The surface temperature fixture 1 contains an array of temperature sensors, which is electrically connected to a data transmission module. The temperature sensor array consists of multiple miniature temperature sensors evenly distributed throughout the interior and surface of the fixture. These sensors comprehensively collect temperature information from different locations within the fixture and transmit this data in real-time to external monitoring equipment via the data transmission module. For example, miniature temperature sensors are positioned near the microchannel structure 110, near the surface, and in various corners within the fixture. This allows for real-time monitoring of the internal temperature distribution and timely detection of temperature anomalies. If a temperature deviation occurs at any location, the operator can promptly adjust the calibration process or check for equipment malfunctions, providing more reliable data support for calibration and improving the accuracy of the calibration data.

[0038] In practical applications, when fabricating the surface temperature fixture 1, a suitable adapter 130 is designed and installed according to the specifications of common thermometer probes to be calibrated. Simultaneously, the positions of the various miniature temperature sensors in the temperature sensor array are rationally arranged to ensure comprehensive coverage of the area inside the fixture and the surface to be monitored. The miniature temperature sensors are reliably connected to the data transmission module to ensure stable data transmission. During use, the thermometer probe to be calibrated is mounted on the adapter 130, and the temperature sensor array begins to collect and transmit temperature data. Operators can use this real-time data to more precisely control and adjust the calibration process, thereby obtaining more accurate calibration results.

[0039] In one specific embodiment, the cryogenic liquid constant temperature bath 2 further includes a refrigeration system 220, which is disposed below or on the side of the constant temperature bath body 210, for cooling the cryogenic liquid medium 4 inside the constant temperature bath body 210 to the required low temperature state.

[0040] The temperature control system includes: a temperature sensor disposed inside the thermostatic bath body 210; a controller disposed outside the thermostatic bath body 210 and electrically connected to the temperature sensor; and a heating device disposed inside the thermostatic bath body 210 for heating the low-temperature liquid medium 4.

[0041] The stirring system 230 includes a stirring paddle 231 and a stirring motor 232. The stirring paddle 231 is disposed inside the thermostatic bath body 210, and the stirring motor 232 is fixed outside the thermostatic bath body 210 and connected to the stirring paddle 231.

[0042] In the above embodiment, the cryogenic liquid constant temperature bath 2 includes a refrigeration system 220, a constant temperature bath body 210, a temperature control system, and a stirring system 230. The constant temperature bath body 210 is made of stainless steel and contains ethanol or liquid nitrogen as the cryogenic liquid medium 4. The refrigeration system 220 is used to cool the liquid medium in the constant temperature bath body 210 to the required low temperature state. The refrigeration system 220 can use existing technology and will not be described in detail here. The temperature control system includes a temperature sensor, a controller, and a heating device. The temperature sensor is installed inside the constant temperature bath body 210 to monitor the temperature of the liquid in the bath in real time and transmit the temperature data to the controller. When the temperature is lower than the set value, the controller controls the heating device to work and heat the liquid; when the temperature is higher than the set value, the refrigeration system 220 is activated to lower the liquid temperature, thereby achieving precise temperature control. The stirring system 230 consists of a stirring motor 232 and a stirring paddle 231. The stirring motor 232 is fixed outside the constant temperature bath body 210 and connected to the stirring paddle 231, which is located inside the constant temperature bath body 210. The stirring motor 232 drives the stirring paddle 231 to rotate, so that the liquid in the constant temperature bath body 210 is evenly mixed, reducing the temperature gradient and ensuring the temperature uniformity of the entire constant temperature bath. When the stirring paddle 231 rotates, it mixes the liquid with a lower temperature at the bottom with the liquid with a slightly higher temperature at the top, so that the liquid temperature tends to be uniform.

[0043] In actual operation, the refrigeration system 220 first cools the ethanol or liquid nitrogen in the thermostatic bath 210 to the set low temperature. The stirring system 230 works continuously to ensure uniform liquid temperature. The low-temperature liquid medium 4 flows into the microchannel structure 110 inside the surface temperature fixture 1 through the inlet of the microchannel structure 110, and fully exchanges heat under the action of the baffle 6, transferring the low temperature to the surface temperature fixture 1.

[0044] In one specific embodiment, the heat spreader 120 is a composite honeycomb structure. The composite honeycomb structure uses copper or aluminum with high thermal conductivity as the honeycomb matrix, and carbon fiber reinforcements are uniformly embedded inside the honeycomb pore walls. The carbon fiber reinforcements are bundled and distributed along the axial direction of the honeycomb pore walls.

[0045] In the above embodiment, the heat spreader 120 has a composite honeycomb structure. This structure uses copper or aluminum, which has high thermal conductivity, as the honeycomb matrix. Copper or aluminum has good thermal conductivity and can quickly transfer heat as the honeycomb matrix. The honeycomb structure can increase the surface area of ​​the heat spreader 120 and improve the efficiency of heat diffusion. The addition of carbon fiber reinforcement not only enhances the mechanical strength of the heat spreader 120, but also optimizes the anisotropy of heat conduction. Since the carbon fiber reinforcement is bundled and distributed axially along the pore walls, it can conduct heat more efficiently in the axial direction. For example, when the heat transferred from the microchannel structure 110 reaches the heat spreader 120, the heat is first diffused through the copper or aluminum matrix, and the honeycomb structure allows the heat to be distributed over a larger area. At the same time, the axially distributed carbon fiber reinforcement acts like heat conduction channels, quickly conducting heat to various parts of the heat spreader 120, making the surface temperature of the tooling more uniform.

[0046] In the actual manufacturing process, a honeycomb-shaped copper or aluminum substrate is first fabricated using appropriate processes, such as casting or machining. Then, carbon fiber reinforcement is uniformly embedded into the honeycomb cell walls. A special impregnation process can be used to impregnate the carbon fiber bundles in a suitable adhesive before embedding them into the honeycomb cell walls, ensuring a tight bond between the carbon fiber reinforcement and the substrate. When installed inside the surface temperature fixture 1, it is essential to ensure that the heat spreader layer 120 is in close contact with the microchannel structure 110 and the outer surface of the surface temperature fixture 1 to achieve good heat conduction. During use, after the cryogenic liquid exchanges heat in the microchannel structure 110, the heat is transferred to the heat spreader layer 120. The composite honeycomb structure heat spreader layer 120 then begins to function, efficiently and uniformly dispersing heat to the surface of the surface temperature fixture 1 through the synergistic effect of the copper or aluminum substrate and the carbon fiber reinforcement, improving the heat spreader effect and providing a more stable and uniform temperature environment for surface thermometer calibration. The tight contact with the outer surface of the fixture ensures good heat conduction.

[0047] In one specific embodiment, the heat spreader 120 is a metal foam material or a nano-aerogel composite material.

[0048] Metal foam materials possess a unique porous structure with high porosity and a large specific surface area. This structure endows them with good thermal conductivity and a certain degree of thermal insulation. When used as a heat spreader 120, heat transferred from the microchannel structure 110 reaches the metal foam heat spreader 120. The heat can be rapidly conducted through the skeleton of the metal foam material. The porous structure increases the heat diffusion path, allowing the heat to be more evenly distributed within the heat spreader 120 and then transferred to the tooling surface. For example, heat is conducted within the metal skeleton of the metal foam material and diffuses to the surrounding area through numerous pores, achieving heat homogenization.

[0049] Nano-aerogel composites are a novel high-performance material with extremely low density and excellent thermal insulation properties, while also possessing a certain degree of thermal conductivity. In the heat spreader 120, the nano-aerogel composite material can uniformly diffuse the heat transferred from the microchannel structure 110 while ensuring that the internal heat of the tooling is not significantly lost. For example, the nanoscale pore structure of the nano-aerogel can limit disordered heat conduction, making it more inclined to diffuse uniformly, thus providing a stable temperature for the tooling surface.

[0050] In practical applications, appropriate materials are selected based on specific calibration requirements and cost factors. For high thermal conductivity requirements, metal foam materials are preferred; for greater emphasis on thermal insulation and temperature stability, nano-aerogel composite materials may be a better choice. When fabricating the heat spreader layer 120, appropriate processes are employed based on the characteristics of the selected material. For metal foam materials, a foaming process can be used; for nano-aerogel composite materials, a special sol-gel process may be required. During installation, ensure that the heat spreader layer 120 is in close contact with the microchannel structure 110 and the outer surface of the surface temperature fixture 1 to guarantee effective heat conduction. During use, both types of heat spreader layers 120 effectively improve the temperature uniformity of the fixture, providing a stable temperature environment for surface thermometer calibration and improving calibration accuracy.

[0051] In one specific embodiment, the outer surface of the surface temperature fixture 1 is coated with a wear-resistant and corrosion-resistant coating, which includes: a bottom layer, which is an epoxy resin coating layer; a middle layer, which is a polyurethane coating layer filled with ceramic microspheres, wherein the ceramic microspheres are uniformly dispersed in the polyurethane matrix; and an outer layer, which is a fluorocarbon coating layer.

[0052] The outer surface of surface temperature fixture 1 is coated with a wear-resistant and corrosion-resistant coating, which consists of three layers. The bottom layer is an epoxy resin coating layer. Epoxy resin has good adhesion and can firmly adhere to the outer surface of the fixture, providing a stable base for the entire coating. The middle layer is a polyurethane coating layer filled with ceramic microspheres, which are uniformly dispersed in the polyurethane matrix. The ceramic microspheres have high hardness, which can enhance the wear resistance of the coating. Polyurethane itself has a certain degree of flexibility and wear resistance. The combination of the two further improves the coating's ability to resist wear. For example, during the use of the fixture, when it is subjected to friction from external objects, the ceramic microspheres can withstand most of the frictional force, reducing the wear of the polyurethane matrix and protecting the surface of the fixture. The outer layer is a fluorocarbon coating layer. Fluorocarbon coating has excellent corrosion resistance and can resist the erosion of various chemicals, preventing the outer surface of the fixture from rusting or corroding.

[0053] In the actual coating process, the outer surface of the tooling is first pretreated, such as by grinding and cleaning, to ensure a smooth and impurity-free surface, thereby improving the adhesion of the epoxy resin coating layer. Then, using appropriate coating techniques, such as spraying or brushing, the epoxy resin coating layer, the polyurethane coating layer filled with ceramic microspheres, and the fluorocarbon coating layer are applied sequentially. After each coating layer is applied, it is dried and cured according to the specified process parameters to ensure the quality of the coating. During use, the wear-resistant and corrosion-resistant coating provides comprehensive protection for the outer surface of the tooling. When the tooling is used in different environments, the bottom epoxy resin coating layer ensures a tight bond between the coating and the tooling, the middle polyurethane coating layer filled with ceramic microspheres resists wear, and the outer fluorocarbon coating layer prevents corrosion, reducing the impact of wear and corrosion on the tooling, extending its service life, and ensuring the long-term stability of calibration accuracy.

[0054] In one specific embodiment, the wear-resistant and corrosion-resistant coating contains dispersed microcapsules, and the microcapsules encapsulate a repair agent composed of resin and curing agent.

[0055] The wear-resistant and corrosion-resistant coating contains dispersed microcapsules, each encapsulating a repair agent composed of resin and a curing agent. When the coating surface suffers minor damage, such as scratches or small breaks, the microcapsules rupture, releasing the repair agent. The resin and curing agent mix at the damaged area, undergoing a curing reaction that fills the damaged area, achieving self-repair of the coating. For example, when a sharp object scratches a shallow mark on the surface of surface fixture 1, the microcapsules at the scratch rupture, the repair agent flows out, and gradually cures in the air, filling the scratch and restoring the integrity and protective performance of the coating.

[0056] In the actual manufacturing process, microcapsules containing the repair agent are first prepared. Microcapsule preparation techniques, such as interfacial polymerization and in-situ polymerization, can be used to encapsulate the resin and curing agent within the microcapsules. Then, when creating the wear-resistant and corrosion-resistant coating, the microcapsules are uniformly dispersed in the coating material. During the coating process, it is crucial to ensure the uniform distribution of the microcapsules within the coating, preventing agglomeration. During use, when the coating is damaged, the microcapsules automatically activate, eliminating the need for frequent manual maintenance. This not only maintains the protective performance of the coating but also reduces the performance degradation of the tooling caused by coating damage, further extending the service life of the surface temperature tool 1 and ensuring the accuracy and stability of calibration work.

[0057] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0058] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A low-temperature surface temperature source for calibration, characterized in that, include: A surface temperature fixture has a microchannel structure inside, and multiple baffles are arranged inside the microchannel structure in an alternating manner. A standard platinum resistance socket is provided on the surface temperature fixture. A cryogenic liquid constant temperature bath includes a constant temperature bath body, and a cryogenic liquid medium is disposed inside the constant temperature bath body, wherein the cryogenic liquid medium is one of ethanol or liquid nitrogen. The inlet and outlet of the microchannel structure are connected to the thermostatic bath body via quick-connect connectors. The low-temperature liquid medium inside the thermostatic bath flows into the microchannel structure through the inlet of the microchannel structure, completes heat exchange, and then flows back to the thermostatic bath through the outlet of the microchannel structure.

2. The low-temperature surface temperature source for calibration as described in claim 1, characterized in that, A heat spreader layer is also embedded inside the surface temperature fixture, and the heat spreader layer is located between the microchannel structure and the outer surface of the surface temperature fixture; the standard platinum resistance socket penetrates the surface temperature fixture and is adjacent to the microchannel structure.

3. The low-temperature surface temperature source for calibration as described in claim 1, characterized in that, An adapter is provided on the upper surface of the surface temperature fixture for connecting the probe of the thermometer being calibrated; wherein, a temperature sensor array is provided inside the surface temperature fixture, and the temperature sensor array is electrically connected to the data transmission module.

4. The low-temperature surface temperature source for calibration as described in claim 1, characterized in that, The microchannel structure is a serpentine continuous channel, and the inlet and outlet of the serpentine continuous channel are respectively connected to the low-temperature liquid medium inside the thermostatic bath.

5. The low-temperature surface temperature source for calibration as described in claim 1, characterized in that, The cryogenic liquid constant temperature bath also includes a refrigeration system, which is disposed below or on the side of the constant temperature bath body, for cooling the cryogenic liquid medium inside the constant temperature bath body to the required low temperature state. A temperature control system includes: a temperature sensor disposed inside the thermostatic bath body; a controller disposed outside the thermostatic bath body and electrically connected to the temperature sensor; and a heating device disposed inside the thermostatic bath body for heating a low-temperature liquid medium. A stirring system includes a stirring paddle and a stirring motor. The stirring paddle is disposed inside the body of the constant temperature bath, and the stirring motor is fixed outside the body of the constant temperature bath and connected to the stirring paddle.

6. The low-temperature surface temperature source for calibration as described in claim 2, characterized in that, The heat spreader is a composite honeycomb structure. The composite honeycomb structure uses copper or aluminum with high thermal conductivity as the honeycomb matrix, and carbon fiber reinforcement is uniformly embedded inside the honeycomb pore walls. The carbon fiber reinforcement is bundled and distributed along the axial direction of the honeycomb pore walls.

7. The low-temperature surface temperature source for calibration as described in claim 2, characterized in that, The heat spreader is a metal foam material or a nano-aerogel composite material.

8. The low-temperature surface temperature source for calibration as described in claim 1, characterized in that, The outer surface of the surface temperature fixture is coated with a wear-resistant and corrosion-resistant coating, which includes: a bottom layer, which is an epoxy resin coating layer; a middle layer, which is a polyurethane coating layer filled with ceramic microspheres, the ceramic microspheres being uniformly dispersed in the polyurethane matrix; and an outer layer, which is a fluorocarbon coating layer.

9. The low-temperature surface temperature source for calibration as described in claim 8, characterized in that, The wear-resistant and corrosion-resistant coating contains dispersed microcapsules, and each microcapsule encapsulates a repair agent composed of resin and curing agent.

10. The low-temperature surface temperature source for calibration as described in claim 3, characterized in that, The temperature sensor array includes multiple miniature temperature sensors, which are uniformly distributed inside and on the surface of the surface temperature fixture.

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