An auxiliary system for dry well furnace metrological verification

Abstract

The application discloses an auxiliary system for dry well furnace metering detection, and belongs to the technical field of instrument analysis and instrument measurement technology. The auxiliary system comprises an oil film self-adding test cavity and an oil infiltration device. The oil film self-adding test cavity and the oil infiltration device are located in the soaking block of the dry well furnace. The oil infiltration device comprises a sealing bead, a compression spring, an oil guide pipe and an oil injector. When a temperature probe is inserted into the oil film self-adding test cavity through the top receiving port, the temperature probe extrudes the sealing bead to compress the compression spring, so that the oil infiltration device performs an oil infiltration action. At this time, the heat conducting oil in the oil injector seeps out from the gap between the sealing bead and the oil guide pipe through the oil guide pipe. The heat conducting oil infiltrates the inner wall of the oil film self-adding test cavity through the spiral oil guide groove, so that an oil film is formed between the temperature probe and the inner wall of the oil film self-adding test cavity. The application realizes sufficient contact and heat conduction by forming the oil film, thereby effectively reducing the metering detection error.

Description

Technical Field

[0001] This invention relates to the field of power systems, and more particularly to an auxiliary system for metering and verification of dry well boilers. Background Technology

[0002] A dry well furnace is a high-precision constant-temperature device used for calibrating temperature sensors such as thermocouples and resistance temperature detectors (RTDs). Its core function is to create a uniform, stable, and adjustable temperature field within the furnace chamber by heating or cooling a solid homogenizing block. This provides a standard temperature reference for the temperature sensor being calibrated, thereby enabling the accuracy verification and calibration of temperature measuring instruments. It is widely used in laboratory and industrial settings for temperature instrument calibration, verification of temperature control systems in various industries, and for metrology institutions for value transfer and standard maintenance. Existing dry well furnaces have test holes on the homogenizing block. After the temperature sensor probe being calibrated is inserted into this test hole, heat conduction occurs through direct contact with the homogenizing block, completing the temperature calibration. It mainly consists of a solid homogenizing block, a temperature control device, a temperature sensor, and a temperature display. Some dry well furnaces are also equipped with auxiliary heat sources such as oil tanks for metrological verification.

[0003] However, in practical applications of on-site metrological verification, the existing use of dry well furnaces has many technical defects, resulting in high verification errors, low efficiency, and difficulty in meeting the actual needs of on-site metrology. On the one hand, the test holes of the heat spreader blocks of dry well furnaces are fixed structures, and after the temperature sensor probe is inserted, it is easy for it to not fit tightly against the inner wall of the test hole, resulting in high contact thermal resistance, uneven heat conduction, and inaccurate temperature detection. If a test hole with a matching aperture is used to ensure fit, the probe may stick to the heat spreader block due to thermal expansion and contraction and cannot be removed. On the other hand, the temperature sensors used in on-site metrology are of various models and specifications, with different probe thicknesses and lengths. Some temperature sensor probes with sealing caps cannot be fully inserted into the test hole or the insertion depth is insufficient. At the same time, standard temperature sensors cannot be inserted and calibrated simultaneously, further aggravating the verification errors and causing the measurement results to fail to accurately reflect the actual operating conditions of the equipment. In addition, during on-site measurement, impurities such as particles and water droplets easily adhere to the surface of the temperature sensor probe. After being inserted into the test hole, these impurities can affect heat conduction and further increase the detection error. Existing dry well furnaces lack corresponding cleaning structures, making it impossible to clean impurities during probe insertion and removal. They also lack effective heat transfer oil recovery structures. If heat transfer oil is added manually to improve the contact effect, it is easy for the heat transfer oil to drip and spill, which not only wastes resources but also pollutes the measurement environment and may even pose a safety hazard of scalding operators. Summary of the Invention

[0004] This invention provides an auxiliary system for the metrological verification of dry well furnaces, which can solve the technical problem in the prior art where the probe and test hole are not tightly fitted, resulting in uneven heat conduction and thus inaccurate temperature detection. By forming an oil film, it achieves full contact heat conduction and effectively reduces metrological detection errors.

[0005] This invention provides an auxiliary system for metering verification of dry well furnaces, applied to the soaking block of a dry well furnace. The auxiliary system includes an oil film self-addition test chamber and an oil seepage device, both located inside the soaking block of the dry well furnace. The oil seepage device includes a sealing bead, a compression spring, an oil guide pipe, and an oil injector, wherein: The oil film self-addition test chamber has a receiving port at the top of the dry well furnace homogenizing block. The inner wall of the oil film self-addition test chamber is provided with a spiral oil guide groove, and the first end of the spiral oil guide groove is connected to the oil outlet of the oil seepage device. The oil seepage device is located on the outer wall of the oil film self-addition test chamber, and the oil seepage device is connected to the inlet side wall of the oil film self-addition test chamber through the oil outlet; The bottom of the oil injector is connected to the first end of the oil guide tube, the tail end of the oil guide tube serves as the oil outlet, the compression spring is located inside the oil guide tube, and the first end of the compression spring is connected to the bottom of the oil injector. The first part of the sealing bead is located inside the oil film self-addition test chamber, the second part of the sealing bead is located inside the oil guide tube, and the second part of the sealing bead is connected to the tail end of the compression spring. When the temperature probe is inserted into the oil film self-addition test chamber through the top receiving port, the temperature probe squeezes the sealing bead to compress the compression spring, causing the oil seepage device to perform an oil seepage action. At this time, the heat-conducting oil in the oil injector seeps out from the gap between the sealing bead and the oil seepage pipe through the oil guide pipe. The heat-conducting oil wets the inner wall of the oil film self-addition test chamber through the spiral oil guide groove, thereby forming an oil film between the temperature probe and the inner wall of the oil film self-addition test chamber.

[0006] This invention provides an auxiliary system for the metrological verification of dry well furnaces. By integrating an oil film self-addition test chamber and an oil seepage device inside the heat exchange block of the dry well furnace, and relying on a trigger-type oil seepage structure composed of sealing beads, compression springs, and oil guide pipes, automatic oil seepage is achieved when the metrological verification probe is inserted. Combined with a spiral oil guide groove connected to the oil outlet of the oil seepage device, the heat transfer oil is evenly wetted along the inner wall of the test chamber, thereby forming a complete oil film between the probe and the inner wall of the chamber. This oil film formation achieves sufficient contact for heat conduction and lubrication, effectively reducing uneven heating and heat loss, and lowering metrological detection errors. It solves the problem of uneven heat conduction caused by poor contact between the probe and the test hole in traditional dry well furnaces, and the trigger-type oil seepage enables on-demand supply of heat transfer oil, avoiding uncontrolled leakage. Simultaneously, the spiral oil guide groove design ensures more comprehensive wetting of the heat transfer oil, effectively reducing contact thermal resistance, lowering temperature errors in metrological verification, and improving the accuracy of temperature measurement.

[0007] Furthermore, it also includes an oil return device, wherein: The oil return device is located on the outer wall of the oil film self-addition test chamber. The oil return device is connected to the bottom of the oil film self-addition test chamber through the oil return port and to the lower side wall of the oil film self-addition test chamber through the oil collection port. The oil return device is used to recover the remaining heat transfer oil through the oil return port and the oil return port.

[0008] In the above scheme, the system adds an oil return device, which is connected to the oil return port at the bottom of the test chamber and the oil collection port on the lower side wall. This allows for the effective recovery of residual heat transfer oil that has not formed an oil film in the test chamber, avoiding the problem of uneven oil film thickness caused by the accumulation of heat transfer oil in the chamber. At the same time, it prevents heat transfer oil from overflowing from the top of the test chamber, solving the problem of heat transfer oil dripping and spilling during on-site metering. This ensures the stability of oil film formation, avoids the safety hazards of heat transfer oil contaminating the metering environment and scalding operators, and realizes the recycling and reuse of heat transfer oil, reducing resource consumption.

[0009] Furthermore, the tail end of the spiral oil guide groove is lower than the oil inlet.

[0010] In the above scheme, the system limits the tail end of the spiral oil guide groove to be lower than the oil collection port. Gravity is used to make the heat transfer oil flow down the oil guide groove to the oil collection port, ensuring that all the remaining heat transfer oil in the oil guide groove can be recovered by the oil collection port. This avoids local oil accumulation caused by residual heat transfer oil in the oil guide groove, further ensuring the uniformity of the oil film thickness on the inner wall of the test chamber. At the same time, it eliminates the problems of oil film damage and uneven heat conduction caused by oil accumulation in the oil guide groove, making the temperature error control of the metrological verification more accurate.

[0011] Furthermore, a check valve is provided at the oil inlet, and a pressure vent is provided at the oil return outlet.

[0012] In the above scheme, the system is equipped with a check valve at the oil inlet and a pressure vent at the oil return outlet. The check valve effectively prevents the heat transfer oil recovered in the oil return device from flowing back into the test chamber, avoiding excessive oil and oil film imbalance in the chamber caused by backflow. The pressure vent balances the pressure inside the oil return device, eliminating oil level fluctuations caused by thermal expansion and contraction of the heat transfer oil due to temperature changes. This ensures the recovery efficiency and stability of the oil return device, making the formation and maintenance of the oil film unaffected by temperature changes, and further improving the stability of metrological verification.

[0013] Furthermore, an oil brush is provided at the top of the inner wall of the oil film self-addition test chamber, and the oil brush is located below the top receiving port. The oil brush is used to clean the temperature probe when the temperature probe is inserted into the oil film self-addition test chamber and when the temperature probe is pulled out of the oil film self-addition test chamber.

[0014] In the above scheme, the system has an oil brush installed at the top of the inner wall of the test chamber and below the top receiving port. This brush can clean the probe during the insertion and removal of the probe from the test chamber, removing impurities such as particles and water droplets. This prevents impurities from entering the test chamber and affecting the formation of the oil film and the heat conduction effect. It also prevents temperature measurement deviation caused by impurities adhering to the probe surface. Furthermore, it can remove the heat conduction oil adhering to the outer wall of the probe when it is removed, reducing the loss of heat conduction oil and preventing environmental pollution caused by heat conduction oil being carried out of the test chamber. This further improves the accuracy of metrological verification and the cleanliness of on-site use.

[0015] Furthermore, it also includes a temperature control module, which comprises a temperature sensor, a heating device, a power supply, and a control center, wherein: The bottom of the dry well furnace heat exchange block is provided with a power interface, the heating device is located inside the dry well furnace heat exchange block, and the power supply is located outside the dry well furnace heat exchange block; The power supply is electrically connected to the heating device through the power interface, and the power supply is used to enable the heating device to obtain output power to heat the dry well furnace homogenizing block; The temperature sensor is located at the top receiving port and is embedded in the top of the inner wall of the oil film self-addition test chamber; The temperature sensor is used to acquire the real-time monitored temperature and transmit the real-time monitored temperature to the control center, so that the control center can determine the temperature difference based on the real-time monitored temperature and the preset calibration temperature, so that the control center can obtain the temperature compensation result, and then adjust the output power of the heating device based on the temperature compensation result.

[0016] In the above scheme, the system adds a temperature control module, sets up a power supply outside the heat exchange block and supplies power to the internal heating device through the bottom power interface, ensuring stable power output of the heating device. At the same time, a temperature sensor is embedded in the top of the inner wall of the test chamber to monitor the temperature at the entrance of the test chamber in real time and transmit it to the control center. The control center compares the real-time monitored temperature with the preset calibration temperature to determine the temperature difference and obtain the temperature compensation result. Then, it adjusts the output power of the heating device to specifically compensate for the heat loss caused by the contact between the entrance of the test chamber and the outside environment, and avoids uneven heating at the probe insertion end due to temperature deviation. This makes the temperature field inside the test chamber more uniform and stable, controls the temperature fluctuation of the metrological verification within a smaller range, and significantly improves the accuracy of metrological calibration.

[0017] Further: the heating device includes an upper heating unit, a middle heating unit, and a lower heating unit connected together, wherein: The upper heating unit is located at the upper section of the homogenizing block of the dry well furnace, the middle heating unit is located at the middle section of the homogenizing block of the dry well furnace, and the lower heating unit is located at the lower section of the homogenizing block of the dry well furnace. The upper heating unit, middle heating unit, and lower heating unit are used to independently heat the corresponding positions of the upper, middle, and lower sections of the dry well furnace homogenizing block using the power source.

[0018] In the above scheme, the heating device of the system is divided into upper, middle and lower heating units, which are arranged in accordance with the upper, middle and lower sections of the heat spreader. This realizes segmented power adjustment of the heating device. The control center can adjust the output power of the heating unit at the corresponding position according to the temperature difference monitored by the temperature sensor. For example, only the power of the upper heating unit can be increased to make up for the inlet heat loss. There is no need to adjust the power of the heat spreader across the entire range. This ensures accurate local compensation of the temperature field of the heat spreader and avoids the temperature field imbalance caused by global power adjustment. This makes the temperature control of the heat spreader more accurate and efficient, further improves the uniformity of the temperature field in the test chamber and reduces the measurement and verification error.

[0019] Furthermore, the heating device is an elastic, thermally conductive metal ring.

[0020] In the above scheme, the heating device of the system is set as an elastic thermally conductive metal ring. Relying on the high thermal conductivity of the metal material, the elastic thermally conductive metal ring can efficiently transfer heat, ensure the temperature field conduction efficiency and stability of the dry well furnace heat exchange block, provide a uniform and stable calibration temperature field for the oil film self-addition test chamber, and ensure the basic temperature field accuracy of temperature compensation adjustment.

[0021] Furthermore, it includes several oil film self-addition test chambers with preset fixed apertures, and an oil seepage device corresponding to each of the several oil film self-addition test chambers, wherein: the preset fixed apertures include several different fixed apertures, and the several oil film self-addition test chambers are respectively used to adapt to several sizes of temperature probes.

[0022] In the above scheme, the system sets up several oil film self-addition test chambers with different preset fixed apertures and is equipped with corresponding oil seepage devices to adapt to different sizes of metrological verification probes. This solves the problem of fixed test hole apertures in traditional dry well furnaces, which cannot be compatible with multiple probe specifications. It eliminates the need for frequent replacement of heat spreaders or adapters, allowing probes of different diameters to fit well with the corresponding aperture test chambers. Combined with the oil seepage devices of each chamber, a dedicated oil film is formed, ensuring the heat conduction uniformity of each probe specification. This significantly improves the compatibility range of the auxiliary system and increases the efficiency of on-site metrological verification.

[0023] Furthermore, it also includes a lifting device, which is used to control the lifting of the dry well furnace homogenizing block so that the temperature probe is fully inserted into the oil film self-addition test chamber.

[0024] In the above solution, the system adds a lifting device to control the lifting of the heat exchange block in the dry well furnace. This adjusts the height of the heat exchange block and solves the problems of uneven heating and low temperature readings caused by structural obstruction preventing the metering probe with a sealed cover from being fully inserted into the test chamber, or by insufficient probe insertion depth. This ensures that the probe can be fully inserted into the oil film self-addition test chamber and make full contact with the oil film, guaranteeing comprehensive heat conduction. At the same time, it allows the standard temperature sensor to be inserted into the calibration hole for accurate metering calibration, completely solving the metering error caused by insufficient insertion depth and improving the accuracy of metering verification.

[0025] This invention provides an auxiliary system for the metrological verification of dry well furnaces. By combining self-addition of oil film, triggered oil seepage, spiral oil guiding, and graded oil return, it achieves on-demand supply, uniform wetting, and recycling of heat transfer oil, effectively solving the core problems of poor contact between the probe and test hole and uneven heat conduction in traditional dry well furnaces, significantly reducing the temperature error in metrological verification. Furthermore, through the design of segmented heating, precise temperature control compensation, and an elastic heat-conducting structure, the temperature field of the heat spreader is made more uniform and stable, and temperature fluctuations and deviations are more precisely controlled, further improving the accuracy of metrological calibration. The combination of multi-aperture test chambers and lifting devices significantly expands the system's adaptability to metrological verification probes of different sizes and structures, solving the problem of short-circuit... The system addresses issues such as probes and probes with sealed caps not being fully inserted or having insufficient insertion depth. Simultaneously, the design incorporates oil brush cleaning, leak prevention, and backflow prevention to avoid safety hazards such as heat transfer oil contamination and burns during on-site metering, reducing resource consumption. The integrated design of each structure, along with automated triggering and control, makes on-site metering verification more convenient, eliminating the need for frequent manual oil replenishment, parts replacement, and equipment adjustments. This effectively shortens verification time and improves on-site metering efficiency. Overall, the dry well furnace ensures high precision, high adaptability, and high efficiency in on-site metering verification, meeting the complex needs of industries such as pharmaceuticals and chemicals, which involve numerous models, specifications, batches, and temperature points. Attached Figure Description

[0026] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an auxiliary system for metering verification of dry well furnaces provided in this embodiment; Figure 2 This is a schematic diagram of a temperature-time periodic curve provided in this embodiment; wherein, Figure 2 (a) in this embodiment is a schematic diagram of the temperature-time cycle curve for measurement using an auxiliary system for dry well furnace metering verification provided in this embodiment. Figure 2 (b) is a schematic diagram of the temperature-time cycle curve using an existing dry well furnace for metering; Figure 3 This is a schematic diagram of the heat exchange block structure of the dry well furnace provided in this embodiment; wherein, Figure 3 (a) in the figure is a top cross-sectional view of the soaking block of the dry well furnace. Figure 3 (b) is a side elevation view of the soaking block of the dry well furnace; Figure 3(c) is a schematic diagram of the heating device 16. Figure 3 (d) in the figure is a three-dimensional view of the homogenizing block of the dry well furnace; The components include: 1. Oil brush; 2. Oil seepage valve; 3. Oil guide pipe; 4. Oil injector; 5. Oil outlet; 6. Oil inlet; 7. Oil inlet pipe; 8. Oil storage tank; 9. Oil return port; 10. Oil return pipe; 11. Spiral oil guide groove; 12. Temperature sensor; 13. Oil film self-addition test chamber; 14. Dry well furnace heat exchange block; 15. Heating chamber; 16. Heating device; 161. Upper section heating unit; 162. Middle section heating unit; 163. Lower section heating unit. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] Example 1: In practical implementation, the heat sources currently used for on-site measurement are mostly dry well furnaces and oil tanks. However, dry well furnaces suffer from inconsistencies due to poor fit, errors, and sensor jamming, causing inconvenience to customers and laboratory personnel. Furthermore, their poor fit with sensors makes it impossible to accurately measure on-site temperature sensors. At the same time, oil tanks have the disadvantages of slow heating and cooling and large volume. The oil level is easily affected by thermal expansion and contraction, so it is necessary to replenish or pump the oil at any time. This poses a high risk of scalding laboratory personnel and contaminating the cleanroom environment of customers. Moreover, their movement is extremely inconvenient and poses a considerable safety risk. When using dry well furnaces to calibrate temperature instruments, the number, shape, size, and temperature measurement port selection of the temperature instruments being calibrated, the calibration environment, and the temperature characteristics of the dry well furnace itself can all lead to significant errors in temperature measurement. Therefore, this embodiment addresses the technical problem of temperature errors caused by the loose fit between the on-site temperature probe and the inherent temperature measuring aperture of the solid heat spreader block in the dry well furnace, while a tight fit can cause the instrument under test to stick to the solid heat spreader block due to thermal expansion and contraction, making it impossible to remove. An auxiliary system for the metrological verification of dry well furnaces based on the oil-lubricating film method is designed. This system forms an oil film between the temperature probe and the dry well furnace aperture for sufficient heat conduction, reducing uneven heating and heat loss, thereby reducing on-site metrological verification errors and improving metrological efficiency.

[0036] This embodiment provides an auxiliary system for metering verification of dry well furnaces, applied to the heat exchange block of the dry well furnace. The auxiliary system includes an oil film self-addition test chamber and an oil seepage device, both located inside the heat exchange block of the dry well furnace. The oil seepage device includes a sealing bead, a compression spring, an oil guide pipe, and an oil injector, wherein: The oil film self-addition test chamber has a receiving port at the top of the dry well furnace homogenizing block. The inner wall of the oil film self-addition test chamber is provided with a spiral oil guide groove, and the first end of the spiral oil guide groove is connected to the oil outlet of the oil seepage device. The oil seepage device is located on the outer wall of the oil film self-addition test chamber, and the oil seepage device is connected to the inlet side wall of the oil film self-addition test chamber through the oil outlet; The bottom of the oil injector is connected to the first end of the oil guide tube, the tail end of the oil guide tube serves as the oil outlet, the compression spring is located inside the oil guide tube, and the first end of the compression spring is connected to the bottom of the oil injector. The first part of the sealing bead is located inside the oil film self-addition test chamber, the second part of the sealing bead is located inside the oil guide tube, and the second part of the sealing bead is connected to the tail end of the compression spring. When the temperature probe is inserted into the oil film self-addition test chamber through the top receiving port, the temperature probe squeezes the sealing bead to compress the compression spring, causing the oil seepage device to perform an oil seepage action. At this time, the heat-conducting oil in the oil injector seeps out from the gap between the sealing bead and the oil seepage pipe through the oil guide pipe. The heat-conducting oil wets the inner wall of the oil film self-addition test chamber through the spiral oil guide groove, thereby forming an oil film between the temperature probe and the inner wall of the oil film self-addition test chamber.

[0037] This embodiment provides an auxiliary system for the metrological verification of dry well furnaces. By integrating an oil film self-addition test chamber and an oil seepage device inside the heat exchange block of the dry well furnace, and relying on a trigger-type oil seepage structure composed of sealing beads, compression springs, and oil guide pipes, automatic oil seepage is achieved when the metrological verification probe is inserted. With the help of a spiral oil guide groove connected to the oil outlet of the oil seepage device, the heat transfer oil can be evenly wetted along the inner wall of the test chamber, so that the probe and the inner wall of the chamber form a complete oil film. This not only solves the problem of uneven heat conduction caused by the poor fit between the probe and the test hole in traditional dry well furnaces, but also achieves on-demand supply of heat transfer oil through trigger-type oil seepage, avoiding uncontrolled leakage. At the same time, the design of the spiral oil guide groove allows for more comprehensive wetting of heat transfer oil, effectively reducing contact thermal resistance, reducing temperature error in metrological verification, and improving the accuracy of temperature measurement.

[0038] In this embodiment, an oil leakage valve consisting of a sealing bead and a compression spring forms an oil leakage device. When the temperature probe is inserted into the oil film self-addition test chamber through the top receiving port, the compression spring is compressed by the pressure of the temperature probe and the sealing bead. This forces the heat-conducting oil in the oil injector through the compression spring in the oil guide tube, and from the gap in the sealing bead through the spiral oil guide groove to wet the entire inner wall of the oil film self-addition test chamber. This creates an oil film between the temperature probe and the inner wall of the oil film self-addition test chamber, achieving sufficient contact for heat conduction and lubrication. The oil outlet is located above the inlet of the oil film self-addition test chamber.

[0039] Preferably, the leak valve formed by the sealing bead and the compression spring can be replaced with other circular squeeze-type switches. The leak valve and the oil injector are used to provide a heat-conducting and sealing medium for the oil film, such as the heat-conducting oil.

[0040] Preferably, in this embodiment, one-quarter of the diameter of the sealing bead (i.e., the first part of the sealing bead) is located inside the oil film self-addition test chamber, and three-quarters of the diameter (i.e., the second part of the sealing bead) is located in the oil guide tube and connected to the internal spring. This allows the temperature probe of the inserted temperature sensor to compress the sealing bead on the inner wall of the oil film self-addition test chamber, causing the heat-conducting oil in the oil injector to flow through the inner diameter of the compression spring to the inner wall of the oil film self-addition test chamber. The oil leakage valve is connected to the first end of the oil guide groove, and the heat-conducting oil wets the entire inner wall of the oil film self-addition test chamber along the oil guide groove, thereby forming a heat-conducting oil film between the temperature probe of the inserted temperature sensor and the inner side of the oil film self-addition test chamber.

[0041] In practice, the oil film self-addition test chamber is the dry well furnace aperture located inside the dry well furnace soaking block, and it is cylindrical in shape. This oil film self-addition test chamber is the test hole (calibration hole) of the dry well furnace soaking block.

[0042] Optionally, a return oil device may also be included, wherein: The oil return device is located on the outer wall of the oil film self-addition test chamber. The oil return device is connected to the bottom of the oil film self-addition test chamber through the oil return port and to the lower side wall of the oil film self-addition test chamber through the oil collection port. The oil return device is used to recover the remaining heat transfer oil through the oil return port and the oil return port.

[0043] Optionally, the tail end of the spiral oil guide groove is lower than the oil inlet.

[0044] Optionally, a check valve is provided at the oil inlet, and a pressure vent is provided at the oil return outlet.

[0045] In practical implementation, the oil return device includes an oil receiving pipe, an oil storage tank, and a return oil pipe. The first end of the oil receiving pipe is connected to the bottom of the oil film self-addition test chamber via an oil receiving port, and the second end is connected to the top of the oil storage tank. The first end of the return oil pipe is connected to the bottom of the oil film self-addition test chamber via a return oil port, and the second end is connected to the bottom of the oil storage tank. When the temperature probe is inserted into the oil film self-addition test chamber through the top receiving port and triggers the oil leakage action, the remaining heat transfer oil that has not formed an oil film returns to the oil storage tank through the connection structure between the oil film self-addition test chamber and the oil receiving port, return oil port, oil receiving pipe, oil storage tank, and return oil pipe, forming an oil level circulation. This prevents oil leakage, eliminates oil level fluctuations caused by thermal expansion and contraction of the heat transfer oil during temperature changes, and ensures oil level balance and sufficient oil film contact. The check valve is located between the oil receiving pipe and the oil storage tank. The oil return port is located at the bottom of the test hole (calibration hole), and is an open structure. It is connected to the oil storage tank through the oil return pipe to recover excess heat transfer oil into the oil storage tank.

[0046] Optionally, an oil brush is provided at the top of the inner wall of the oil film self-addition test chamber, the oil brush being located below the top receiving port, wherein: the oil brush is used to clean the temperature probe when the temperature probe is inserted into the oil film self-addition test chamber and when the temperature probe is pulled out of the oil film self-addition test chamber.

[0047] In the specific implementation process, when the temperature probe of the temperature sensor is inserted into the oil film self-addition test chamber, impurities such as particles and water droplets on the temperature probe are removed by an oil brush; when the temperature probe is removed, the oil brush removes the heat-conducting oil from the outer wall of the temperature probe.

[0048] Preferably, in this embodiment, the oil brush has a ring-shaped structure and is located below the top receiving port, embedded in the top of the inner wall of the oil film self-addition test chamber.

[0049] Optionally, it also includes a temperature control module, which includes a temperature sensor, a heating device, a power supply, and a control center, wherein: The bottom of the dry well furnace heat exchange block is provided with a power interface, the heating device is located inside the dry well furnace heat exchange block, and the power supply is located outside the dry well furnace heat exchange block; The power supply is electrically connected to the heating device through the power interface, and the power supply is used to enable the heating device to obtain output power to heat the dry well furnace homogenizing block; The temperature sensor is located at the top receiving port and is embedded in the top of the inner wall of the oil film self-addition test chamber; The temperature sensor is used to acquire the real-time monitored temperature and transmit the real-time monitored temperature to the control center, so that the control center can determine the temperature difference based on the real-time monitored temperature and the preset calibration temperature, so that the control center can obtain the temperature compensation result, and then adjust the output power of the heating device based on the temperature compensation result.

[0050] In the specific implementation process, the temperature sensor obtains the real-time monitoring temperature by monitoring the temperature at the temperature orifice inlet (i.e., the top receiving port), and the control center determines the temperature compensation result. Based on the temperature compensation result, the output power of the heating device is adjusted to adjust the temperature compensation, thereby ensuring uniform heating of the temperature probe. The heating device is used to maintain the temperature of the heat exchange block in the dry well furnace, and continuously transfers heat to the oil film self-addition test chamber through the heat exchange block.

[0051] Preferably, in this embodiment, the temperature sensor has a ring-shaped structure and is embedded at the top of the inner wall of the oil film self-addition test chamber, used to monitor the temperature change of the upper section of the soaking block in the dry well furnace in real time. The temperature sensor selected in this embodiment can be a temperature sensor or other temperature-sensing component.

[0052] In practical implementation, this embodiment provides an auxiliary system for the metrological verification of dry well furnaces, such as... Figure 1 As shown, the system includes an oil brush 1, an oil leakage valve 2 formed by a sealing bead and a compression spring, an oil guide pipe 3, an oil injector 4, an oil outlet 5, an oil inlet 6, an oil inlet pipe 7, an oil storage tank 8, an oil return outlet 9, an oil return pipe 10, a spiral oil guide groove 11, a temperature sensor 12, and an oil film self-addition test chamber 13. Taking the calibration of temperature points of 20℃, 100℃, and 260℃ as an example, the temperature is set to 20℃, heated and kept constant, and then the temperature probe is inserted as shown in the attached diagram. Figure 1 In the test holes on the heat exchange block of the dry well furnace shown, particles, water droplets, and other impurities on the temperature probe are removed by an oil brush 1. At the temperature probe inlet and outlet, the oil brush squeezes the sealing beads on the inner wall of the test hole, triggering an oil seepage action. This allows the heat transfer oil in the oil injector 4 to pass through the oil guide pipe 3 and the seepage valve 2, flowing through the gaps in the sealing beads and into the oil guide groove 11, thus soaking the entire inner wall of the test hole. This forms an oil film between the temperature probe and the inner wall of the test hole, ensuring sufficient contact for heat conduction and lubrication. Excess heat transfer oil returns to the oil storage tank 8 through the return port 9 and the receiving port 6, forming an oil level circulation system. This prevents oil leakage and eliminates oil level fluctuations caused by thermal expansion and contraction during temperature changes, ensuring oil level balance and sufficient contact between the temperature probe and the oil film. The temperature sensor 12 monitors the temperature at the inlet of the temperature hole. When the temperature probe is removed, the oil brush 1 removes the heat transfer oil from the outer wall of the probe.

[0053] The oil film heat conduction method in this embodiment can achieve tight contact heat conduction between different models of temperature probes and test holes used in the same experimental process as described above, reduce errors, and effectively improve its applicability to multiple models.

[0054] Preferably, the oil brush 1 is a high-temperature resistant oil scraper that does not undergo physical or chemical changes at 400℃; Preferably, the heat transfer oil can be replaced with other heat-conducting sealing media, including water-glycerin mixtures, glycerin, n-octane, industrial-grade paraffin, etc. Preferably, the thermally conductive sealing medium selected in this embodiment meets the requirement that the working viscosity at temperature is greater than 20 Pa·s and less than 140 Pa·s; Preferably, the spiral oil guide groove 11 has a depth of less than 0.5 mm, a width of more than 1 mm, a downward flow angle of 30° to 60°, and the lowest end (i.e. the tail end of the spiral oil guide groove 11) is lower than the oil collection port 6. Preferably, the oil leakage valve 2 adopts a circular squeeze-type switch with a diameter of less than 1.5 mm and a switching pressure of less than 6 N; Preferably, the diameter of the oil inlet 6 is greater than 1 mm; Preferably, the oil inlet is located at two-fifths of the lower section of the test hole (calibration hole) and is connected to the inner wall of the test hole (calibration hole).

[0055] In specific applications, taking a typical scenario as an example, the existing dry well furnace on-site metering process is compared with this embodiment as follows. Taking the calibration of -20℃, 100℃, and 260℃ as an example, if the temperature probes of many types of temperature sensors on site can fit tightly with the test holes of the dry well furnace, the existing dry well furnace on-site needs to first set the temperature to -20℃. After cooling down and maintaining the temperature, the measurement is performed. After the current temperature sensor's -20℃ calibration point is tested, the same process as above is repeated to test the current temperature sensor's 100℃ and 260℃ temperature rise. After all calibration points are tested, the temperature is cooled down to room temperature and the power is turned off before the transfer can be carried out to continue the work of the next temperature sensor test. The system and monitoring method used in this embodiment can first set the calibration point temperature to -20℃. After cooling and maintaining a constant temperature, measurement is performed. After the measurement of the current temperature sensor is completed, the process immediately moves to the next temperature sensor for -20℃ measurement, until all temperature sensors have been measured at their -20℃ calibration points. Then, the process of increasing the temperature to 100℃ and 260℃ is repeated until all calibration points have been measured. Finally, the system is cooled to room temperature and powered off. Experimental results show that the temperature-time period curves for measuring two temperature sensors (including temperature sensor A and temperature sensor B) using the above two methods are as follows: Figure 2 As shown, the temperature-time cycle curve for measurement using the auxiliary system for dry well furnace metering verification provided in this embodiment is as follows: Figure 2As shown in (a) above, the temperature-time period curve measured using an existing dry well furnace is as follows: Figure 2 As shown in (b), the horizontal axis represents time, with each division representing 10 minutes (10 min), and the vertical axis represents temperature (°C). The curves include the calibration temperature points set for the dry well furnace, including a low temperature of -20°C, a normal temperature of 25°C, a medium temperature of 100°C, and a high temperature of 260°C. The blue broken line represents the temperature change of the dry well furnace over time, representing the process of rising / falling from one temperature point to another. The blue straight line represents the measurement time at the current temperature calibration point. Figure 2 (a) in the text means that at the same temperature point, temperature sensor A and temperature sensor B are measured one by one. After completion, the measurement of temperature sensor A and temperature sensor B is carried out one by one at the next temperature point until all temperature points are measured. Figure 2 In the diagram (b), it indicates that temperature sensor A is measured at each temperature point first, and then temperature sensor B is measured at each temperature point after all temperature points have been measured. As can be seen from the diagram, the system and corresponding metrology method provided in this embodiment simultaneously measures two sensors under constant temperature, avoiding the repeated temperature increases and decreases required for measuring the second sensor in traditional methods. This significantly reduces the ineffective temperature adjustment time; the measurement time is only 150 minutes, while the traditional method requires 230 minutes, saving 80 minutes (approximately 35%) of metrology time. Secondly, the temperature curve in this embodiment is continuous, allowing for the calibration of all temperature points in one operation; whereas the curve in the traditional method is segmented, involving numerous round trips of temperature increases and decreases, making the process cumbersome and time-consuming.

[0056] Optionally: The heating device includes an upper heating unit, a middle heating unit, and a lower heating unit connected together, wherein: The upper heating unit is located at the upper section of the homogenizing block of the dry well furnace, the middle heating unit is located at the middle section of the homogenizing block of the dry well furnace, and the lower heating unit is located at the lower section of the homogenizing block of the dry well furnace. The upper heating unit, middle heating unit, and lower heating unit are used to independently heat the corresponding positions of the upper, middle, and lower sections of the dry well furnace homogenizing block using the power source.

[0057] Optional: The heating device is an elastic thermally conductive metal ring.

[0058] In practice, the heating device is an embedded, distributed layout device located at the top, middle, and bottom.

[0059] Preferably, in this embodiment, the heating device has a power of not less than 800W, a working diameter of less than 0.8cm, a working length of more than 3cm, and a distance of more than 1mm between the heating hole diameter and its cross-section.

[0060] Preferably, the power supply used in this embodiment has a capacity of not less than 1.3KVA, a full power supply time of not less than 15 minutes, and a weight of not more than 9kg.

[0061] Optionally, it includes a plurality of oil film self-addition test chambers 13 with preset fixed apertures, and an oil seepage device corresponding one-to-one with the plurality of oil film self-addition test chambers 13, wherein: the preset fixed apertures include a plurality of different fixed apertures, and the plurality of oil film self-addition test chambers 13 are respectively used to adapt to the temperature probes of a plurality of sizes.

[0062] Optionally, a lifting device is also included, which is used to control the lifting of the dry well furnace homogenizing block so that the temperature probe is fully inserted into the oil film self-addition test chamber 13.

[0063] In the specific implementation process, this embodiment achieves automatic control of the up and down lifting of the heat exchange block of the dry well furnace by adding a lifting device. This solves the technical problems that the temperature sensor with the sealing cover cannot fully insert the temperature probe into the oil film self-addition test chamber 13, or the temperature measurement result is too low due to insufficient probe insertion depth, and the corresponding standard temperature sensor cannot be inserted into the calibration hole at the same time due to the obstruction of the temperature sensor sealing cover, thus making it impossible to accurately perform metrological calibration.

[0064] In practical applications, the existing device mainly consists of two parts: a heat spreader and a heating device. Its main function is to provide a stable heat source. The heating device provides the heat source for the heat spreader, and the heat spreader has a temperature measuring hole with a fixed diameter inside to provide a heat source for the inserted temperature sensor probe. Therefore, the existing device can only measure temperature sensors with a diameter and length that meet its requirements. For temperature sensors with a large coefficient of thermal expansion, this can lead to problems such as the sensor being unable to be removed after testing due to temperature fluctuations. At the same time, when the diameter of the temperature sensor probe is smaller than the test hole, the measured temperature will be too low due to poor fit. Furthermore, due to design limitations, it cannot test short probe temperature sensors with sealed caps.

[0065] Therefore, this embodiment improves the structure of the homogenizing block of the dry well furnace by adding, for example, [the following method is used] to the test holes of the homogenizing block. Figure 1The structure shown solves the measurement errors caused by issues such as probe adhesion in the testing of various types of temperature sensors. The structure provided in this embodiment, by adding an oil film for heat conduction inside the test hole, allows temperature probes of different diameters to fit tightly against the hole wall, thereby effectively improving temperature measurement accuracy. Furthermore, for short probe sensors with insufficient length or sealed caps, a retractable thermally conductive contact is designed at the front end of the test hole to automatically adapt to the probe length and conduct heat. The retractable thermally conductive contact is made of shape memory alloy material and achieves automatic extension and retraction of 0-20mm via electromagnetic drive, making it particularly suitable for calibrating short probe sensors with sealed caps.

[0066] Example 2: In practical applications, the standard instrument currently used for field measurement is the conventional dry well furnace. The dry well furnace mainly consists of a solid homogenizing block, an adjustment device for the temperature-controlled homogenizing block, a sensor for measuring the temperature of the homogenizing block, and a temperature display. These components can be a combined unit or independent units with clearly defined functions. The working principle of the dry well furnace is to heat or cool a homogenizing block to bring the furnace chamber to a set temperature and maintain a uniform and stable temperature field. The heated metal isothermal block serves as a medium, providing an adjustable and controllable uniform and stable reference temperature field for calibrating temperature-sensitive devices such as thermocouples and resistance thermometers.

[0067] Based on existing technology, this embodiment provides a dry well furnace homogenizing block structure through design improvements, such as... Figure 3 As shown, the dry well furnace is implemented using an auxiliary system and a power-off temperature control system for metering and verification, as described in Embodiment 1. The dry well furnace soaking block 14 includes several oil film self-addition test chambers 13 with different fixed apertures, including a heating chamber 15 and a heating device 16. The bottom of the dry well furnace soaking block is provided with a positive (+) and a negative (-) terminal of a power interface. A top-view cross-sectional view of the dry well furnace soaking block is shown below. Figure 3 As shown in (a) above, the side elevation view of the soaking block of the dry well furnace is as follows: Figure 3 As shown in (b) above, the structural schematic diagram of the heating device 16 is as follows: Figure 3 As shown in (c) above, the three-dimensional view of the soaking block of the dry well furnace is as follows. Figure 3 As shown in (d) in the diagram. The heating device 16 employs an elastic, heat-conducting metal ring, with its bottom positive terminal (+) electrically connected to the positive terminal of the power interface, and its bottom negative terminal (-) electrically connected to the negative terminal of the power interface, as shown in the diagram. Figure 3As shown in (c), the heating device 16 includes an upper heating unit 161, a middle heating unit 162, and a lower heating unit 163 connected together; wherein, the power interface below the dry well furnace heat spreader 14 is electrically connected to the built-in power supply and the built-in heating device 16 of the dry well furnace heat spreader 14. The improved dry well furnace heat spreader 14 significantly expands its application range and can be compatible with the detection requirements of temperature sensors of different structural forms. Figure 3 For ease of understanding, the parts about the oil seepage device, oil return device and other structures have been omitted. These are the same as those described in Embodiment 1 and will not be described in detail here.

[0068] Example 3: In practical applications, the dry well furnace is a high-precision constant temperature device used for calibrating temperature sensors (such as thermocouples and resistance temperature detectors). Its core function is to provide a uniform and stable temperature field to simulate different temperature environments, thereby verifying or calibrating the accuracy of temperature measuring instruments. Typical application scenarios include: temperature instrument calibration in laboratories or industrial settings; temperature control system verification in industries such as pharmaceuticals, food, and chemicals; and value transfer and standard maintenance by metrology institutions. Currently, the core technological breakthroughs of dry well furnaces lie in temperature uniformity and temperature control accuracy. New equipment uses high thermal conductivity materials (such as aluminum alloy heat spreaders) and advanced sensors to ensure that the temperature field uniformity error is less than ±0.05℃, meeting the needs of precision experiments and industrial calibration. However, although domestic and international efforts are continuously improving dry well furnace technology to reduce its error, none have considered the special characteristics of the metrology industry, especially the challenges faced by metrologists in on-site measurement, such as the variety of models and specifications, large batches, the need to measure many temperature points in a short period of time, and the wide range of temperature points. Furthermore, due to the inherent uncertainty of the metrology environment, multiple relocations are often required for measurement, and the resulting discrepancies from these relocations need to be addressed. In existing technologies, to ensure uniform heating of the solid heat spreader and prevent burns, all dry well furnaces have their solid heat spreaders positioned relatively low and equipped with protective covers. However, this design presents a problem: temperature transmitters with baffles may not be able to be inserted into the solid heat spreader or may be inserted too shallowly, leading to uneven heating and inaccurate temperature readings. This issue can be resolved by increasing the height of the solid heat spreader and adding a heating element above the opening of the solid heat spreader to ensure uniform and consistent temperature. Additionally, an enlarged, detachable temperature protection cover can be added to address safety concerns. However, current dry well furnaces often fail to consider the short and inconsistent sizes of temperature sensor probes used in the field. Furthermore, the frequent heating and cooling of dry well furnaces significantly increases measurement and testing time, adding to the workload of metrology personnel and impacting customer experiments and production schedules. This leads to poor repeatability, high volatility, and low efficiency in the measurement process, resulting in measurement errors exceeding 10%. Consequently, the measurement results cannot accurately reflect the actual operating conditions of the equipment, a long-standing problem for field metrology personnel. Current technologies also include oil baths for measurement to ensure uniform heating of temperature probes. While oil baths provide more uniform heating than dry well furnaces, their heating and cooling rates are slow, and the need for constant addition and subtraction of liquid media due to thermal expansion and contraction further complicates matters. Moreover, in isolated workshops, especially in pharmaceutical plants, temperature sensors often require frequent changes between rooms and locations due to the numerous rooms, complex equipment, and compact layout. When these areas need frequent and significant relocation, oil baths are prone to spillage, potentially causing burns to personnel and environmental pollution.

[0069] This embodiment provides a device for reducing on-site metrological verification errors and improving metrological efficiency in dry well furnaces. It employs an auxiliary system and a power-off temperature control system for metrological verification of dry well furnaces as described in Embodiment 1. The power-off temperature control system consists of a voltage stabilization module, a heating and cooling module, and a time control module.

[0070] Specifically, the working principle and operation process of the device for reducing on-site metering verification errors and improving metering efficiency in dry well furnaces described in this embodiment are as follows: First, when the on-site metering needs to be moved, the operator disconnects the 220V indoor power supply, and the device automatically switches to the built-in power supply of the dry well furnace heat spreader 14. The device stabilizes the output voltage of the built-in power supply to a safe 220V operating voltage through a voltage stabilization module, providing stable power to the heating device 16, cooling module, and temperature control module built into the dry well furnace heat spreader 14. Simultaneously, the operator can preset temperature holding, heating, or cooling programs via the control system touchscreen, and set the operating duration of each program using the time control module, achieving continuous temperature control of the dry well furnace during the relocation process. When the voltage stabilization module detects that the built-in power supply voltage is lower than the required heating voltage threshold, the device automatically initiates a gradient cooling program, gradually reducing the temperature of the dry well furnace heat spreader 14 to a safe range. This prevents equipment damage or jamming of the temperature sensor probe with the heat spreader due to insufficient power supply, ensuring the safety of the dry well furnace and metering equipment.

[0071] Furthermore, to address the potential damage to the dry well furnace caused by sudden power outages, the device is equipped with a power outage protection system. In the event of a sudden power outage, the device's software control system automatically switches to and activates the built-in safety power supply. The voltage converter in the voltage stabilization module converts the built-in safety voltage to a 220V operating voltage, continuously powering the heating device 16 and the cooling module, allowing the equipment to continue its metering and testing operations. Operators can pre-set the heating and cooling programs via the touchscreen, specifying the heating and cooling rates, temperature holding time, and program start time. The device executes heating, cooling, and temperature control operations according to the preset program. When the voltage stabilization module detects that the built-in power supply is below the temperature output requirement, the device immediately stops temperature output and activates the forced cooling protection program. This reduces the temperature gradient of the dry well furnace's heat spreader 14 to a safe range, preventing deformation of the heat spreader 14 due to rapid cooling or jamming of the high-expansion coefficient probe with the heat spreader, thus ensuring equipment safety during sudden power outages.

[0072] Finally, the device is equipped with a control system operated via a touchscreen and a high-precision reference sensor. Utilizing the high thermal conductivity of the dry well furnace heat spreader 14, it quickly reaches and stabilizes the target calibration temperature. The temperature sensor probe to be calibrated is inserted into the oil film self-addition test chamber 13 of the heat spreader. Heat is conducted through direct contact between the probe and the heat spreader 14, achieving temperature calibration. The heat spreader 14 has a built-in temperature sensor, enhancing the integration of temperature field monitoring and control. The temperature sensor collects the real-time monitoring temperature at the test chamber inlet and transmits it to the control center. The control center compares the real-time monitoring temperature with the preset calibration temperature, calculates the temperature difference, and generates a temperature compensation result. This allows the output power of the built-in heating device 16 in the heat spreader 14 to specifically compensate for heat loss at the test chamber inlet, ensuring uniform heating of the calibrated sensor probe and improving the accuracy of the metrological calibration. Simultaneously, the high-precision reference sensor collects temperature data across the entire heat spreader, providing accurate temperature field feedback to the control system, further optimizing the temperature compensation adjustment effect, and ensuring the uniformity and stability of the temperature field in the heat spreader.

[0073] Specifically, the voltage stabilization module converts and stabilizes the voltage and current, and protects the equipment. When the power supply is insufficient to provide heating and constant temperature operation for ≤1 minute, it immediately enters forced power-off and activates cooling protection mode. The time control module provides timing and information feedback control functions for the entire process.

[0074] This embodiment improves upon the construction of the heat spreader and its test holes by adding a power-off temperature control system. This solves the problem of having to lower the dry well furnace temperature to room temperature and then perform frequent temperature adjustments (shutdown, startup, heating, and temperature balancing) for each temperature sensor being measured, thus improving work efficiency. Combined with a power-off delay cooling and constant temperature control module, it prevents high-expansion-coefficient probes from jamming due to sudden cooling of the heat spreader during power outages. Heating, cooling, and constant temperature operations can be performed during power-off movement. This ensures the safety, accuracy, and speed of calibration for personnel and various sensors. The control center uses a PID algorithm combined with thermocouple closed-loop feedback to control temperature fluctuations within ±0.2℃, meeting the calibration requirements of high-precision sensors. The power-off delay function is implemented through a relay and capacitor energy storage circuit, ensuring that the heat spreader maintains a gradient cooling for 10 minutes after a power outage, effectively protecting the high-expansion-coefficient probe. Experimental verification shows that the improved device significantly reduces the temperature measurement error of various sensors compared to the original device, shortens the calibration time by more than 70%, and does not exhibit probe damage or jamming. The device provided in this embodiment, which reduces on-site metrological verification error and improves metrological efficiency in dry well furnaces, can control the metrological detection error within ±0.5℃.

[0075] In practical applications, this embodiment enables temperature maintenance during long-term relocation of the dry well furnace when power is interrupted. The built-in heating device 16 within the dry well furnace heat spreader 14 maintains a constant temperature. Furthermore, during site changes for metrology and testing, it allows for temperature control, heating, and cooling operations without power interruption. This avoids the frequent temperature fluctuations required in current dry well furnace operations, such as lowering the furnace temperature to room temperature, shutting it down, restarting it, heating it up, and then testing it again after temperature equilibrium is reached. This reduces metrology and testing time by over 75%, significantly improving efficiency. The dry well furnace heat spreader 14 provided in this embodiment has advantages such as small size, low power consumption, and rapid heating. It solves the problem of frequent relocation and testing for temperature sensors, especially in pharmaceutical isolation workshops where there are often many rooms, complex equipment, and compact spaces. It maintains heat spread even after power outages, reducing time and labor costs associated with frequent relocation and temperature fluctuations, further improving metrology efficiency. It ensures temperature stability unaffected by external environmental factors and is suitable for long-term calibration operations in high-precision temperature environments. Furthermore, this invention addresses the limitations of existing dry well furnaces in handling temperature sensors of varying specifications. Due to the short length and diverse diameters of field temperature sensor probes, the traditional dry well furnace test hole design often fails to accommodate the insertion requirements of all sensor types, leading to increased detection errors, poor repeatability, and high volatility. This embodiment, through the design of an adjustable test hole diameter (i.e., several oil film self-addition test chambers with different fixed hole diameters) and a lifting device, can accommodate temperature sensor probes of different lengths and diameters, ensuring that the probe can be fully inserted to a sufficient depth, thereby reducing detection errors and improving the accuracy and reliability of measurement.

[0076] Example 4: This embodiment provides a test process for a device to reduce on-site metrological verification errors and improve metrological efficiency in dry well furnaces. Specifically, it involves a comparative experiment between an oil film method and a conventional method. This experiment was conducted on-site in the R&D workshop metrological testing facility, where the customer required a tolerance of 0.5℃. The specific steps include: The first group of sensors was measured and tested using conventional methods, while the second group of sensors was measured and tested using the oil film method provided in Embodiments 1 to 3. First, the temperature probes of the same model GA2700 temperature sensor were used for testing. The specific dry well furnace settings were 0℃, 100℃, and 130℃. The measured temperature data values ​​(in degrees Celsius) of the first and second groups of GA2700 temperature sensors were compared as shown in Table 1 below. Five parallel tests were conducted at each set temperature. The data in the table show that the GA2700 temperature probe is relatively short and is greatly affected by the contact area and depth. However, the oil film formation method provided in this embodiment can effectively compensate for its shortcomings.

[0077] Table 1 Comparison of measured temperature data values ​​of the GA2700 temperature sensor in the first and second groups. Next, tests were conducted using temperature probes of the same model, Pt100 temperature sensor. The specific dry well furnace settings were 90℃, 121℃, and 130℃. The measured temperature data (in degrees Celsius) of the first and second groups of Pt100 temperature sensors were compared in Table 2 below. Based on the above experiments and the comparison results, it can be determined that because the Pt100 temperature probe has a smaller error than the GA2700 temperature probe, it is also difficult to meet the customer's requirements.

[0078] Table 2 Comparison of measured temperature data values ​​of Pt100 temperature sensors in the first and second groups. Next, tests were conducted using the same model temperature sensor, WZPT-206T, with the specific dry well furnace set temperatures being 90℃, 121℃, and 130℃. The measured temperature data (in degrees Celsius) of the first and second groups of WZPT-206T temperature sensors were compared in Table 3 below. Based on the above experiments and the comparison results, it can be determined that because the WZPT-206T temperature probe has a smaller error than the GA2700 temperature probe, it is also difficult to meet the customer's requirements.

[0079] Table 3 Comparison of measured temperature data values ​​of WZPT-206T temperature sensor in the first and second groups. Through comparative experiments with the three types of sensors, and by collecting measured data from different models of temperature sensors such as Pt100 and GA2700 at multiple temperature points (e.g., 90℃, 121℃, 130℃), the measurement error of the existing dry well furnace metering scheme was intuitively quantified. At each set temperature point, the measured value of the sensor deviated from the target temperature by 0.3℃ to 2℃, and the deviation at some temperature points exceeded the customer's allowable range. This directly proves that the traditional dry well furnace suffers from problems such as poor contact between the probe and the test hole and uneven heat conduction, resulting in the metering accuracy failing to meet the field requirements. Furthermore, the comparative experiments show that the oil film formation method provided in this embodiment can effectively compensate for the shortcomings of the temperature probe, such as its short length and the significant influence of contact area and depth.

[0080] This embodiment uses an oil-lubricating film method to form an oil film between the temperature probe and the dry well furnace aperture for sufficient heat conduction, reducing uneven heating and heat loss, and lowering measurement and detection errors. At the same time, it can perform heating and cooling processes during site transfer, significantly improving work efficiency, greatly increasing the work efficiency of metrology personnel, and greatly improving the accuracy of measurement.

[0081] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0082] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An auxiliary system for metering verification of dry well furnaces, applied to the heat exchange block of a dry well furnace, characterized in that, The auxiliary system includes an oil film self-addition test chamber and an oil seepage device, both located inside the soaking block of the dry well furnace. The oil seepage device includes a sealing bead, a compression spring, an oil guide pipe, and an oil injector, wherein: The oil film self-addition test chamber has a receiving port at the top of the dry well furnace homogenizing block. The inner wall of the oil film self-addition test chamber is provided with a spiral oil guide groove, and the first end of the spiral oil guide groove is connected to the oil outlet of the oil seepage device. The oil seepage device is located on the outer wall of the oil film self-addition test chamber, and the oil seepage device is connected to the inlet side wall of the oil film self-addition test chamber through the oil outlet; The bottom of the oil injector is connected to the first end of the oil guide tube, the tail end of the oil guide tube serves as the oil outlet, the compression spring is located inside the oil guide tube, and the first end of the compression spring is connected to the bottom of the oil injector. The first part of the sealing bead is located inside the oil film self-addition test chamber, the second part of the sealing bead is located inside the oil guide tube, and the second part of the sealing bead is connected to the tail end of the compression spring. When the temperature probe is inserted into the oil film self-addition test chamber through the top receiving port, the temperature probe squeezes the sealing bead to compress the compression spring, causing the oil seepage device to perform an oil seepage action. At this time, the heat-conducting oil in the oil injector seeps out from the gap between the sealing bead and the oil seepage pipe through the oil guide pipe. The heat-conducting oil wets the inner wall of the oil film self-addition test chamber through the spiral oil guide groove, thereby forming an oil film between the temperature probe and the inner wall of the oil film self-addition test chamber.

2. The auxiliary system for metering verification of dry well furnaces as described in claim 1, characterized in that, It also includes an oil return device, wherein: The oil return device is located on the outer wall of the oil film self-addition test chamber. The oil return device is connected to the bottom of the oil film self-addition test chamber through the oil return port and to the lower side wall of the oil film self-addition test chamber through the oil collection port. The oil return device is used to recover the remaining heat transfer oil through the oil return port and the oil return port.

3. The auxiliary system for metering verification of dry well furnaces as described in claim 2, characterized in that, The tail end of the spiral oil guide groove is lower than the oil inlet.

4. The auxiliary system for metering verification of dry well furnaces as described in claim 2, characterized in that, A check valve is provided at the oil inlet, and a pressure vent is provided at the oil return outlet.

5. The auxiliary system for metering verification of dry well furnaces as described in claim 1, characterized in that, An oil brush is provided at the top of the inner wall of the oil film self-addition test chamber. The oil brush is located below the top receiving port. The oil brush is used to clean the temperature probe when the temperature probe is inserted into the oil film self-addition test chamber and when the temperature probe is pulled out of the oil film self-addition test chamber.

6. The auxiliary system for metering verification of dry well furnaces as described in claim 1, characterized in that, It also includes a temperature control module, which comprises a temperature sensor, a heating device, a power supply, and a control center, wherein: The bottom of the dry well furnace heat exchange block is provided with a power interface, the heating device is located inside the dry well furnace heat exchange block, and the power supply is located outside the dry well furnace heat exchange block; The power supply is electrically connected to the heating device through the power interface, and the power supply is used to enable the heating device to obtain output power to heat the dry well furnace homogenizing block; The temperature sensor is located at the top receiving port and is embedded in the top of the inner wall of the oil film self-addition test chamber; The temperature sensor is used to acquire the real-time monitored temperature and transmit the real-time monitored temperature to the control center, so that the control center can determine the temperature difference based on the real-time monitored temperature and the preset calibration temperature, so that the control center can obtain the temperature compensation result, and then adjust the output power of the heating device based on the temperature compensation result.

7. The auxiliary system for metering verification of dry well furnaces as described in claim 6, characterized in that: The heating device includes an upper heating unit, a middle heating unit, and a lower heating unit connected together, wherein: The upper heating unit is located at the upper section of the homogenizing block of the dry well furnace, the middle heating unit is located at the middle section of the homogenizing block of the dry well furnace, and the lower heating unit is located at the lower section of the homogenizing block of the dry well furnace. The upper heating unit, middle heating unit, and lower heating unit are used to independently heat the corresponding positions of the upper, middle, and lower sections of the dry well furnace homogenizing block using the power source.

8. The auxiliary system for metering verification of dry well furnaces as described in claim 6, characterized in that: The heating device is an elastic thermally conductive metal ring.

9. The auxiliary system for metering verification of dry well furnaces as described in claim 1, characterized in that, It includes several oil film self-addition test chambers with preset fixed apertures, and an oil seepage device corresponding to each of the several oil film self-addition test chambers, wherein: the preset fixed apertures include several different fixed apertures, and the several oil film self-addition test chambers are respectively used to adapt to several sizes of temperature probes.

10. The auxiliary system for metering verification of dry well furnaces as described in claim 1, characterized in that, It also includes a lifting device, which is used to control the lifting of the dry well furnace homogenizing block so that the temperature probe is fully inserted into the oil film self-addition test chamber.

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