A blackbody temperature calibrator

Abstract

The application discloses a blackbody temperature calibrator, belongs to the technical field of radiation thermometer calibration equipment, and comprises a graphite tube and a cylindrical conductive metal block connected with two end fixed sleeves; a partition cavity bottom is arranged in the middle of the graphite tube to divide a tube hole; a heat dissipation block with a positioning stepped surface is coaxially arranged outside the conductive metal block; and the end of the metal block is not exposed to the outside. Two heat dissipation blocks are coaxially assembled with an inserting block respectively; the left and right inserting blocks are respectively provided with standard and to-be-detected radiation thermometers; the two coaxially align with the center of the partition cavity bottom; and the stepped surface is attached to the inserting block to complete axial positioning. The right inserting block is integrally formed with a plunger part; a strip-shaped cavity is arranged in the wall of the plunger shaft hole in a ring shape; a first plane thread is arranged on the sliding column in the cavity; a self-rotating rotating sleeve is arranged in the plunger; a second plane thread of the rotating sleeve is engaged with the thread of the sliding column; the rotating sleeve is connected with a bottle cap type adjusting screw cap on the right end surface through a gear assembly; the sliding column can be driven to fold and clamp and position the to-be-detected radiation thermometer by rotating the screw cap; the structure is compact; and clamping and calibration operation is convenient.

Description

Technical Field

[0001] This invention relates to radiation thermometer calibration equipment, and more particularly to a blackbody temperature calibrator. Background Technology

[0002] A blackbody radiation source is a device or entity that can generate standard blackbody radiation. Its core purpose is to calibrate the temperature measurement accuracy of infrared and other radiation thermometers. It can be compared with the standard temperature of a blackbody cavity by infrared radiation thermometers and various radiation measuring instruments to complete the calibration of infrared radiation thermometers and other radiation measuring instruments.

[0003] To address this, those skilled in the art have specifically designed a blackbody temperature calibrator for infrared radiation thermometers, corresponding to Chinese patent publication number CN223796141U. This calibrator primarily involves placing conductive metal blocks at both ends of a graphite tube. After conduction, the entire graphite tube is heated, achieving a stable heating temperature at the bottom of the partition cavity. A standard radiation thermometer measures the temperature of the bottom of the partition cavity from one side of the first cavity to adjust the overall heating temperature of the graphite tube to meet testing requirements. Once the temperature is reached, the infrared radiation thermometer being calibrated measures the temperature of the bottom of the partition cavity from one side of the second cavity, and the difference between the measured temperature and the actual temperature at the bottom of the partition cavity is used for calibration. While this prior art provides a theoretical design description for the detection object based on a blackbody radiation source, it does not explain how to accurately and reliably position and install the radiation sensor based on this unique structural design, lacking precise axial limiting and coaxial positioning structural design.

[0004] Practice has shown that during the assembly of the standard radiation thermometer and the radiation thermometer under test, a certain degree of axial misalignment can easily occur. This prevents the detection ends of the two thermometers from being precisely aligned with the temperature measurement area of ​​the blackbody core, resulting in inconsistent detection benchmarks. It is difficult to ensure that the two thermometers are measuring the same object, ultimately leading to large deviations in calibration data and inaccurate accuracy assessments. Furthermore, during batch testing of radiation sensors, it is impossible to achieve both precise positioning and rapid assembly / disassembly of the radiation thermometers, making it difficult to meet the calibration and testing requirements of batch radiation thermometers and resulting in low work efficiency. Summary of the Invention

[0005] In light of the above description of the current state of the technology, the purpose of this invention is to provide a blackbody temperature calibrator to better solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention employs a blackbody temperature calibrator, comprising a graphite tube and two conductive metal blocks fixedly fitted at both ends thereon. The graphite tube has a partition cavity bottom in the center that divides its tube hole into left and right sections. The conductive metal blocks are cylindrical in shape and have heat sinks coaxially fitted on their outer sides. The axial mounting hole of the heat sink includes a positioning step surface. When the conductive metal block is inserted into the heat sink, the end of the conductive metal block does not protrude from the positioning step surface. The invention also includes a mounting block coaxially inserted into the two heat sinks. One end of the mounting block is abutted against the positioning step surface to achieve axial positioning. A standard radiation thermometer is fixed on the left mounting block, and a radiation thermometer to be tested is fixed on the right mounting block. The two radiation thermometers are coaxially aligned with the center of the partition cavity bottom.

[0007] The right insert block has a plunger portion coaxially integrated at one end facing the conductive metal block. Within the shaft hole of the plunger portion, several strip-shaped cavities are arranged in a ring array. A sliding column is linearly slidably installed in each strip-shaped cavity. The surface of the sliding column facing away from the graphite tube is provided with a first planar thread. A rotating sleeve is also coaxially and rotatably installed within the plunger portion. One end face of the rotating sleeve is provided with a second planar thread that meshes with the first planar thread. The other end is installed in the plunger portion in a rotating manner and is connected to a bottle cap-shaped adjusting cap that is rotatably installed on the right end face of the right insert block through a gear assembly. This allows the radiation thermometer to be measured, inserted into the shaft hole, to be positioned and clamped when the adjusting cap is rotated.

[0008] Furthermore, a guide rod is fixed to the bottom of the strip cavity. The guide rod is slidably fitted onto the sliding column to guide the sliding column to slide in a straight line, and the sliding column is not allowed to completely slide away from the guide rod.

[0009] Furthermore, both the strip cavity and the sliding column are rectangular structures, and they slide together. The end of the guide rod facing the shaft hole has a limiting post with an increased diameter. The sliding column slides together with the limiting post and cannot completely slide away from the guide rod.

[0010] Furthermore, a positioning block is fixed to one end of the slide column facing the shaft hole. The positioning block is a rectangular block, and the side used to contact the radiation thermometer under test has an arc concave surface. The arc concave surface is coaxially attached to the radiation thermometer under test.

[0011] Furthermore, the rotating sleeve is a cylindrical structure of a rotating body, and its end facing away from the planar thread has an integral annular external gear ring. The diameter of the tip circle of the external gear is larger than the diameter of the rest of the rotating sleeve, so that the rotating table can be rotatably installed in the right insert block without axial movement.

[0012] Furthermore, the gear assembly includes a first gear and a second gear fixed coaxially, both gears being rotatably mounted inside the right insert block. The first gear meshes with the external gear ring, and the second gear meshes with an internal gear ring integrally formed on the inner sidewall of the adjusting cap. The adjusting cap has a bushing portion coaxially protruding on its central inner side, and the free end of the bushing portion is rotatably mounted inside the right end face of the right insert block to achieve the rotatable installation of the adjusting cap.

[0013] Furthermore, the outer wall of the adjusting cap is threaded, and the right end face of the right insert block is provided with an annular groove. One of the inner side walls of the annular groove is threaded so that the side wall of the adjusting cap can be screwed into the annular groove in a threaded manner and always in contact with a pressure-bearing elastic ring installed at the bottom of the annular groove. During the process of the adjusting cap being screwed into the annular groove, the internal gear ring and the second gear always maintain meshing and have a tendency to slide relative to each other axially.

[0014] Furthermore, the pressure-bearing elastic ring includes an annular flat pad and an integrally adjacent trumpet-shaped outward-folding cover. The small end of the outward-folding cover is integrally connected to the inner edge of the flat pad, and the large end flips outward and continues to arc-shaped roll towards the flat pad. The flat pad is used to fix the bottom of the annular groove, and the arc-shaped convex surface of the outward-folding cover is used to abut against the end face of the adjusting screw cap.

[0015] Furthermore, the plunger portion has an annular cooling chamber inside the graphite tube end, and the cooling chamber is filled with circulating coolant; the cooling chamber is connected to the circulation chamber of the heat sink block for containing coolant through several cooling channels; all cooling channels are L-shaped and pass through the position between the strip cavity and the sliding column.

[0016] Furthermore, a fastening sleeve is coaxially provided on the outer side of the adjusting cap. The fastening sleeve is threadedly fitted onto the free end of the heat sink, and one end of the fastening sleeve is located inside the heat sink and axially presses against the insertion block to achieve a close contact between the insertion block and the positioning step surface. The right end of the fastening sleeve on the right insertion block is closed to form a cap-like structure that closes the right port of the heat sink, and the radiation thermometer to be measured is placed inside the fastening sleeve. The left insertion block is provided with an exhaust hole, which is sealed with a screw plug so that when argon gas is introduced into the graphite tube for venting, the gas is vented through the exhaust hole.

[0017] Beneficial Effects: This invention provides a relatively complete overall structure for an instrument calibrating a radiation thermometer based on a blackbody radiation source. Through rapid and accurate positioning, stable clamping, anti-loosening adjustment, and circulating heat dissipation, among other structural improvements, it achieves numerous substantial beneficial effects, as detailed below:

[0018] 1. Achieve precise coaxial positioning, unify the testing benchmark, and significantly improve calibration accuracy.

[0019] This invention achieves precise axial positioning of the mounting block by using a precise fit between the heat sink positioning step surface and the mounting block, completely eliminating axial offset issues. Simultaneously, the left and right mounting blocks respectively fix the standard radiation thermometer and the radiation thermometer under test. For the end where the radiation thermometer under test is frequently inserted and removed, a planar threaded engagement transmission structure is used. Rotating the adjusting cap drives multiple sliding columns to slide synchronously towards the center, achieving uniform circumferential clamping of the thermometer probe. This not only ensures high coaxial positioning accuracy but also facilitates easy assembly and disassembly. This invention guarantees that the detection ends of the two thermometers are coaxially aligned and precisely aligned with the center of the graphite tube's central partition cavity, ensuring that both are detecting the same temperature object and maintaining a unified detection benchmark. This fundamentally avoids calibration errors caused by installation misalignment or benchmark deviation, greatly improving the accuracy and reliability of radiation thermometer calibration.

[0020] 2. It has anti-loosening and stabilization functions, and accurately adapts to calibration and fine-tuning needs.

[0021] This invention achieves axial advance and retraction adjustment through the threaded engagement structure of the adjusting cap and the annular groove. Combined with the integrated pressure-bearing elastic ring structure at the bottom of the groove, the elastic deformation characteristics of the outward-facing cover continuously provide a tightening force to the adjusting cap, eliminating thread engagement gaps and effectively avoiding the problem of the adjusting cap easily loosening during the testing process. It can stably maintain the clamping tightness of the radiation thermometer under test, and at the same time, it can minimize the problem of excessive probe shaking during the fine-tuning process of calibration, making it easier for the staff to accurately observe the size of the temperature measurement spot, thereby facilitating the control of the temperature measurement interval, accurately determining the installation status of the thermometer, and meeting the fine-tuning requirements of high-precision calibration.

[0022] 3. An integrated closed-loop heat dissipation structure ensures the reliability of the entire structure holding the radiation thermometer.

[0023] This invention also includes a separate, enclosed cooling chamber located between the plunger section, the graphite tube, and the clamping structure. This chamber is connected to the heat sink circulation chamber via evenly distributed L-shaped cooling channels, forming a complete closed-loop coolant circulation system. The cooling channels avoid the core structural components, ensuring uninterrupted assembly and adjustment performance. The design is rational and allows for simultaneous, comprehensive, and uniform heat dissipation from the plunger section, the sliding clamping structure, and the heat sink, preventing abnormal temperatures in the clamping area and mitigating aging and deformation of the internal structural components of the right-side mounting block caused by high temperatures, thus ensuring long-term stable operation of the equipment. Attached Figure Description

[0024] The following are auxiliary illustrations used to explain some specific embodiments of the present invention. The accompanying drawings mainly describe the principles of specific operation execution structures or methods of some embodiments of the present invention, but this does not mean that the physical structure or operation steps of the present invention can only be as shown in the figures.

[0025] Figure 1 This is a schematic diagram of a blackbody temperature calibrator of the present invention used in calibrating a timer for measuring the radiation temperature of the subject.

[0026] Figure 2 yes Figure 1 Enlarged view of the structure within the rectangular dashed line area;

[0027] Figure 3 yes Figure 2 The structure shown is an axial sectional view.

[0028] Figure 4 This is a schematic diagram of a timer that uses a sliding column to attach a positioning block to the radiation thermometer to be measured.

[0029] Figure 5 This is a half-sectional view of the rotating sleeve;

[0030] Figure 6 It is an axial sectional view of an adjusting cap equipped with a control wheel;

[0031] Figure 7 This is a schematic diagram of the bearing elastic ring after partial cross-section;

[0032] Figure 8 This is an axial cross-sectional schematic diagram of a cap-like structure of a fastening sleeve.

[0033] Component labeling: Graphite tube 1, Quartz tube 2, Heat sink 3, Conductive metal block 4, Isolation cavity bottom 5, Standard radiation thermometer 6, Radiation thermometer to be measured 7, Left insertion block 8, Right insertion block 9, Plunger part 10, Sliding column 11, Positioning block 12, Rotating sleeve 13, First gear 14, Second gear 15, Internal gear ring 16, Adjusting cap 17, Pressure-bearing elastic ring 18, Flat washer 18a, Outward-facing cover 18b, Bushing part 19, Guide rod 20, Sliding cavity 21, Cooling cavity 22, Cooling channel 23, Fastening sleeve 24, External gear ring 25, Second plane thread 26, Pipe thread 27, Operating wheel 28, Circulation cavity 29. Detailed Implementation

[0034] The embodiments of the present invention will be fully described below. Some core features of the embodiments will be specifically illustrated in the accompanying drawings, wherein the same or similar reference numerals in the drawings represent the same or similar technical features, or structures, steps, or processes with similar functions. Other embodiments derived by those skilled in the art based on these embodiments without requiring creative effort are also within the protection scope of the present invention.

[0035] Please see Figure 1This embodiment discloses a blackbody temperature calibrator. The calibrator features a horizontally arranged graphite tube 1, with conductive metal blocks 4 fixedly fitted at both ends of the graphite tube 1. The conductive metal blocks 4 have a cylindrical structure and are securely nested and fixed to the ends of the graphite tube 1. A partition cavity bottom 5 is integrally formed in the middle of the graphite tube 1, completely dividing the internal tube hole of the graphite tube 1 into two independent left and right sections. Heat sinks 3 are coaxially fitted onto the outer sides of the two conductive metal blocks 4. The heat sinks 3 have axially penetrating mounting holes, and the hole walls are integrally formed with positioning steps. After the conductive metal blocks 4 are inserted into the mounting holes of the heat sinks 3, their ends are completely retracted into the mounting holes and do not protrude beyond the positioning steps, achieving initial positioning and assembly. As one of the key design structures, such as... Figures 1-3 As shown, two mounting blocks are also specially designed and coaxially inserted into the left and right heat sinks 3 respectively. During assembly, one end face of the mounting block must be tightly fitted with the positioning step surface of the heat sink 3. The step surface ensures precise axial positioning of the mounting block, preventing axial offset and providing installation assurance for the radiation thermometer. This ensures coaxial alignment with the central partition cavity inside the graphite tube 1, thereby guaranteeing the accuracy of temperature detection. More specifically, the left mounting block 8 on the left is used to fix the standard radiation thermometer 6, and the right mounting block 9 is used to fix the radiation thermometer 7 to be tested. The detection ends of the standard radiation thermometer 6 and the radiation thermometer 7 are coaxially opposite each other and precisely aligned with the center position of the bottom 5 of the central partition cavity of the graphite tube 1. This ensures that both can accurately detect the temperature of the same object, guaranteeing a unified detection benchmark and facilitating comparison to determine the accuracy of the radiation thermometer 7.

[0036] It should be noted that radiation thermometers differ from common rod-shaped liquid expansion thermometers. Radiation thermometers are non-contact thermometers and have a series of supporting components. The installation of the radiation thermometer mentioned in this embodiment mainly refers to the installation of the temperature sensor or radiation detector, which generally adopts a cylindrical metal encapsulation structure. Therefore, during calibration, the main task is to clamp and install these components to ensure they are correctly positioned relative to the target. More specifically, at the end of the right mounting block 9 facing the conductive metal block 4, a section of the original plunger portion 10 is integrally and coaxially extended. The plunger portion 10 has a through-hole in its center, which is integrally and coaxially connected to the corresponding hole in the right mounting block 9, so that together they can be used to install the detection probe of the radiation thermometer 7 to be tested. On the wall of the shaft hole of the plunger part 10, multiple strip-shaped cavities are arranged in a ring array. Each strip-shaped cavity is arranged in a straight line along the corresponding radial direction of the plunger part 10. Each strip-shaped cavity is independently equipped with a sliding post 11 that can slide linearly. The surface of the sliding post 11 facing away from the graphite tube 1 is machined with a first planar thread. Continue reading Figure 3 The plunger part 10 is coaxially assembled inside as follows Figure 5The rotating sleeve 13 shown can rotate in place within the plunger portion 10. A second planar thread 26 is machined on the end face of the rotating sleeve 13 facing the slotted cavity. This second planar thread 26 meshes with the first planar threads of each sliding column 11. The end of the rotating sleeve 13 away from the planar thread is connected to an adjusting cap 17 via a gear assembly. The adjusting cap 17 has a bottle cap-like structure and is rotatably mounted on the outer side of the right end face of the right mounting block 9. In actual use, if necessary, a common operating wheel 28 can be installed on the back of the adjusting cap 17 for manual rotation. This rotation, via the gear assembly, drives the rotating sleeve 13 to rotate synchronously. The meshing planar threads drive multiple sliding columns 11 to slide linearly towards the center of the shaft hole in the plunger portion 10, thereby uniformly clamping and positioning the probe of the radiation thermometer 7, which is inserted into the shaft hole, completing the fixed assembly of the thermometer. This achieves precise coaxial installation and fixation, allowing for quick disassembly and assembly, and facilitating batch testing of the radiation thermometer 7.

[0037] As for specific implementation details, such as Figure 3 As shown, a guide rod 20 is fixedly installed at the center of the bottom of each strip cavity. The direction of the guide rod 20 is consistent with the linear sliding direction of the strip cavity to better guide the movement of the sliding column 11. This prevents the sliding column 11 from being unable to move stably in a straight line when it slides out of the corresponding strip cavity because it is hanging outside the strip cavity. This ensures that the sliding column 11 moves smoothly throughout the entire installation and adjustment process, thus allowing for the smooth installation and debugging of the radiation thermometer 7 to be tested. More specifically, during manufacturing, a matching socket hole is opened inside the sliding column 11 to match the guide rod 20. Both the socket hole and the guide rod 20 have a rectangular cross-section structure, allowing the sliding column 11 to slide and fit onto the outside of the guide rod 20 through the socket hole. Relying on the guiding and limiting effect of the guide rod 20, the movement trajectory of the sliding column 11 is strictly constrained, ensuring that the sliding column 11 can only make precise linear reciprocating slides along the strip cavity, effectively avoiding deviation or jamming during the sliding process of the sliding column 11. Meanwhile, the sleeve structure of the guide rod 20 and the slide column 11 forms a limiting fit, which can effectively limit the sliding stroke of the slide column 11, prevent the slide column 11 from completely slipping off the guide rod 20 during the sliding process, and ensure the stability and continuity of the clamping structure operation.

[0038] Based on the above embodiments, similarly, as Figures 3-4Specifically, both the strip cavity and the sliding column 11 can be designed as matching rectangular structures. The rectangular cavity shape and the column structure fit together and slide in a sliding fit, which can better and more thoroughly restrict the circumferential rotational freedom of the sliding column 11. In order to achieve the purpose of preventing the sliding column 11 from completely slipping off the guide rod 20 during the sliding process, a limiting column with an increased diameter (not shown in the figure) is integrally formed at the end of the guide rod 20 facing the shaft hole of the plunger part 10. The outer diameter of the limiting column is larger than the main rod diameter of the guide rod 20. The sleeve hole of the sliding column 11 is adapted to the outer diameter of the limiting column, and the size of the sleeve hole opening is consistent with the other rod diameters of the guide rod 20. In this way, the sliding column 11 slides outside the limiting column throughout the entire process. The large-diameter structure of the limiting column forms an axial limit, which completely prevents the sliding column 11 from sliding off the guide rod 20 from the structure, and always ensures the assembly and fit relationship between the sliding column 11 and the guide rod 20.

[0039] This embodiment provides a detailed description of the clamping end structure of the sliding column 11. A positioning block 12 is fixedly assembled at one end of each sliding column 11 facing the shaft hole of the plunger portion 10, such as... Figure 4 The positioning pad 12 adopts a rectangular block structure and is firmly fixed to the end of the sliding column 11. The positioning pad 12 faces the center of the shaft hole and has an arc-shaped concave surface on one side surface that is used to contact the radiation thermometer 7 under test. The curvature of the arc matches the curvature of the outer wall of the radiation thermometer 7 under test. When multiple sliding columns 11 slide and clamp towards the center simultaneously, the arc-shaped concave surface of each positioning pad 12 can completely fit and wrap around the outer wall of the radiation thermometer 7 under test, realizing multi-point coaxial clamping. This can not only improve the positioning coaxiality of the thermometer under test, but also increase the contact clamping area, avoid probe compression damage caused by single-point clamping, and improve the firmness of clamping and fixing.

[0040] like Figure 5 As shown, the rotating sleeve 13 in this embodiment adopts a rotary cylindrical structure to fit the coaxial assembly space inside the plunger part 10. An external toothed ring 25 is integrally formed at the end of the rotating sleeve 13 furthest from the second plane thread 26. The tooth tip circle diameter of the external toothed ring 25 is larger than the maximum outer diameter of the rest of the rotating sleeve 13 cylinder, making the rotating sleeve 13 form a stepped hollow shaft structure with one end larger than the other. A matching stepped limiting structure is provided inside the plunger part 10 corresponding to the assembly position of the rotating sleeve 13. During assembly, the external toothed ring 25 of the rotating sleeve 13 can rotate circumferentially without axial movement, allowing the rotating sleeve 13 to rotate stably and without offset within the internal assembly space of the right insert block 9 and the plunger part 10, ensuring the accuracy of the threaded meshing transmission.

[0041] like Figure 3The gear assembly mentioned in the above embodiments specifically includes a first gear 14 and a second gear 15 that are coaxially fixed to each other. The two gears rotate synchronously at the same speed and are rotatably installed inside the reserved assembly cavity of the right insert block 9. The first gear 14 is positioned to correspond to the outer toothed ring 25 of the rotating sleeve 13, and the two mesh with each other for transmission. The second gear 15 meshes with the inner toothed ring integrally formed on the inner wall of the adjusting cover 17, forming a complete gear transmission link. A bushing portion 19 is coaxially protruding on the inner center of the adjusting cover 17. The free end of the bushing portion 19 is fitted into the groove (not shown in the figure) on the right end face of the right insert block 9. Through the rotational engagement of the bushing portion 19 and the groove, the adjusting cover 17 can rotate in place on the end face of the right insert block 9, ensuring that the adjusting cover 17 can rotate circumferentially, thereby driving the gear assembly to operate and achieving precise adjustment of the clamping structure.

[0042] In this embodiment, as Figure 3 , Figure 6 As shown, an external thread, such as a pipe thread 27, is machined on the outer wall of the adjusting cap 17. An annular groove is opened on the right end face of the right mounting block 9. An internal thread matching the external thread of the adjusting cap 17 is machined on the corresponding inner wall of the annular groove, so that the adjusting cap 17 is assembled in the annular groove by thread engagement. Axial advance and retreat adjustment and gear transmission can be achieved by rotation to ensure relative stability during the adjustment process. In particular, it can ensure that the adjusting cap 17 always has a certain stability no matter how tight the clamping is, and it is not easy to loosen, which would cause the radiation thermometer 7 to be tested to loosen during the test. During installation, continuous observation and adjustment are required, necessitating the repeated loosening or tightening of the adjusting cap 17. Therefore, during testing, the temperature measurement distance must be strictly controlled according to the instrument's D:S parameters. Too close a distance results in a small spot, while too far a distance causes the spot to extend beyond the measured area, both leading to inaccurate temperature measurements. Maintaining a stable distance between the lens and the object being measured is crucial throughout the process. The optimal insertion distance improves detection accuracy. Thus, during installation, it's necessary to simultaneously position and clamp the radiation thermometer while observing the spot size. During this fine-tuning process, if the adjusting cap 17 becomes loose, causing the sliding column 11 to wobble, the radiation thermometer 7 may slightly wobble and fail to maintain a stable posture. This makes it even more difficult to observe the spot in real-time during adjustment, hindering accurate judgment of the insertion depth and clamping tightness of the current radiation thermometer 7. The clamping tightness also slightly affects the installation direction of the thermometer. In this embodiment, the object used for temperature detection is a cone-shaped point, requiring even more meticulous adjustment and installation. Specifically, during manufacturing, if... Figure 3A pressure-bearing elastic ring 18 is fixedly installed at the bottom of the annular groove. After the adjusting cap 17 is screwed into the groove, its end face is always in close contact with the pressure-bearing elastic ring 18, which eliminates the gap of the thread meshing and ensures that the corresponding thread surfaces are tightly attached when meshing, thereby preventing loosening.

[0043] In this embodiment, the pressure-bearing elastic ring 18 is an integral elastic structure, such as... Figure 7 As shown, it mainly consists of an annular flat washer 18a and a trumpet-shaped outward-folding cover 18b. The small end of the outward-folding cover 18b is integrally connected to the inner edge of the annular flat washer 18a. After the large end of the outward-folding cover 18b flips outward, it continues to arc-shaped and roll towards the flat washer 18a, forming a rounded, convex elastic contact surface. During assembly, the annular flat washer 18a is fitted and fixed to the bottom of the annular groove of the right insert block 9, achieving overall positioning and installation. The rounded, convex surface of the outward-folding cover 18b faces the end face of the adjusting cap 17 and elastically contacts the end face of the adjusting cap 17. Relying on the elastic deformation characteristics of the outward-folding cover 18b itself, it can always provide elastic tightening force to the adjusting cap 17, eliminating threaded assembly gaps and preventing the adjusting cap 17 from loosening.

[0044] Considering that the series of structures used for the radiation thermometer 7 to be measured should be cooled in a timely manner, this embodiment adds a corresponding cooling and heat dissipation structure to cool the part of the plunger 10 near the end of the graphite tube 1, thereby avoiding excessive temperature rise in the area of ​​the plunger 10. An annular closed cooling chamber 22 is opened inside the end of the plunger 10 near the graphite tube 1. The cooling chamber 22 is an independent cavity structure, connected to a coolant circulation supply device, which can continuously circulate coolant into the cooling chamber 22 to achieve constant temperature heat dissipation of the plunger 10. Specifically, it can share the cooling medium with the original cooling system of the heat sink 3. That is, a perforation is set in the circulation cavity 29 originally reserved inside the heat sink 3 for storing and circulating coolant. Through this perforation, multiple L-shaped cooling channels 23 connect the cooling cavity 22 of the plunger 10 and the circulation cavity 29 of the heat sink 3. All cooling channels 23 are evenly spaced and pass through the position between the strip cavity and the sliding column 11. During operation, the coolant forms a closed-loop circulation between the cooling chamber 22, the cooling channel 23 and the circulation chamber 29 of the heat sink 3, which can simultaneously and evenly dissipate heat from the plunger part 10, the clamping slide column 11 structure and the entire heat sink 3, quickly removing the heat generated by the equipment and avoiding the impact of high temperature on the temperature measurement accuracy and the stability of the equipment structure.

[0045] As another specific design feature, fastening sleeves 24 can be threaded onto the outer sides of the free ends of both left and right heat sinks 3, for example... Figure 2As shown, a fastening sleeve 24 is provided at the right end. The inner side of the fastening sleeve 24 presses against the outer end face of the right mounting block 9, ensuring that the mounting block is always tightly fitted against the positioning step surface of the heat sink 3, completely locking the axial position of the mounting block and preventing it from loosening or shifting during operation. This serves as the basis for installing the radiation sensor under test. The fastening sleeve 24 on the right side can also be used as follows: Figure 8 The structure shown adopts a right-end closed cap-like structure, which completely covers the right port of the closed heat sink 3, and houses the radiation thermometer 7 to be tested inside the fastening sleeve 24. The purpose is to prevent excessive heat from flowing out of the annular gap between the radiation thermometer 7 and the shaft hole when occasionally adapting to radiation thermometers 7 of different diameters. Of course, elements such as annular sealing rings can also be inserted directly into the annular gap. A vent hole (not shown in the figure) is provided through the left mounting block. The vent hole is fitted with a detachable plug (not shown in the figure). During calibration, argon gas is first introduced into the graphite tube 1 to purge the internal atmosphere. During the purging process, the plug is unscrewed, and the air and impurities inside the graphite tube 1 are discharged through the vent hole. After purging, the plug is tightened to seal the vent hole and ensure the stability of the calibration atmosphere inside the equipment. Similarly, the right mounting block can also be adapted to design a corresponding venting channel as the above-mentioned vent hole for purging. In the specific design, the setting path is the same as that of the cooling channel 23, just avoid the corresponding structural components.

[0046] The above series of specific implementation details are merely some preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the claims of the present invention. Those skilled in the art, based on their understanding of the above embodiments and referring to the basic principles recorded in the claims of the present invention, can easily modify the design ideas, but these modifications still fall within the scope of protection of the invention.

Claims

1. A blackbody temperature calibrator, comprising a graphite tube (1) and two conductive metal blocks (4) fixedly fitted at both ends thereon, wherein the graphite tube (1) has a partition cavity bottom (5) in the center that divides its tube hole into left and right sections, the conductive metal blocks (4) are cylindrical and a heat sink (3) is coaxially fitted on their outer side, the axial mounting hole of the heat sink (3) includes a positioning step surface, wherein when the conductive metal block (4) is inserted into the heat sink (3), the end of the conductive metal block (4) does not protrude from the positioning step surface, characterized in that: It also includes a mounting block coaxially inserted between the two heat sinks (3), one end of which is attached to the positioning step surface to achieve axial positioning. A standard radiation thermometer (6) is fixed on the left mounting block (8), and a radiation thermometer to be tested (7) is fixed on the right mounting block (9). The two radiation thermometers are coaxially aligned with the center of the bottom of the partition cavity (5). The right insert block (9) has a plunger part (10) coaxially and integrally with one end facing the conductive metal block (4). In the hole wall of the shaft hole of the plunger part (10), several strip-shaped cavities are arranged in a ring array. A sliding column (11) is linearly slidably installed in each strip-shaped cavity. The side surface of the sliding column (11) away from the graphite tube (1) is provided with a first planar thread. A rotating sleeve (13) is also coaxially and rotatably installed in the plunger part (10). One end face of the rotating sleeve (13) is provided with a second planar thread (26) that meshes with the first planar thread. The other end is installed in the plunger part (10) in place and rotates in place. It is connected to the bottle cap-shaped adjusting cap (17) that is rotatably installed on the right end face of the right insert block (9) through a gear assembly so that when the adjusting cap (17) is rotated, the radiation thermometer (7) to be measured inserted in the shaft hole can be positioned and clamped.

2. The blackbody temperature calibrator according to claim 1, characterized in that, The bottom of the strip cavity is fixed with a guide rod (20), which is slidably fitted onto the sliding column (11) to guide the sliding column (11) to slide in a straight line, and the sliding column (11) is not allowed to completely slide away from the guide rod (20).

3. A blackbody temperature calibrator according to claim 2, characterized in that, Both the strip cavity and the sliding column (11) are rectangular structures and slide together. The guide rod (20) has a limiting post with an increased diameter at one end facing the shaft hole. The sliding column (11) slides together with the limiting post and cannot completely slide away from the guide rod (20).

4. A blackbody temperature calibrator according to claim 1, characterized in that, A positioning block (12) is fixed at one end of the sliding column (11) facing the shaft hole. The positioning block (12) is a rectangular block, and the side used to contact the radiation thermometer (7) to be tested has a concave arc surface. The concave arc surface is coaxially attached to the radiation thermometer (7) to be tested.

5. A blackbody temperature calibrator according to claim 1, characterized in that, The rotating sleeve (13) is a cylindrical structure of a rotating body. One end of it, which is away from the planar thread, has an integral annular external gear ring (25). The diameter of the tooth tip circle of the external gear is larger than the diameter of the rest of the rotating sleeve (13), so that the rotating table can be rotatably installed in the right insert block (9) without axial movement.

6. A blackbody temperature calibrator according to claim 5, characterized in that, The gear assembly includes a first gear (14) and a second gear (15) fixed coaxially. Both gears are rotatably installed inside the right insert block (9). The first gear (14) meshes with the external gear ring (25), and the second gear (15) meshes with the internal gear ring integrally formed with the inner sidewall of the adjusting cover (17). The adjusting cover (17) has a bushing (19) coaxially protruding on the inner center. The free end of the bushing (19) is rotatably installed inside the right end face of the right insert block (9) to realize the rotatable installation of the adjusting cover (17).

7. A blackbody temperature calibrator according to claim 6, characterized in that, The outer wall of the adjusting cap (17) is threaded, and the right end face of the right insert block (9) is provided with an annular groove. One of the inner side walls of the annular groove is threaded so that the side wall of the adjusting cap (17) is screwed into the annular groove in a threaded manner and is always in contact with a pressure-bearing elastic ring (18) installed at the bottom of the annular groove. During the process of the adjusting cap (17) being screwed into the annular groove, the internal gear ring (16) and the second gear (15) always maintain meshing and have a tendency to slide relative to each other axially.

8. A blackbody temperature calibrator according to claim 7, characterized in that, The pressure-bearing elastic ring (18) includes an annular flat pad (18a) and an integrally adjacent flared cover (18b). The small end of the flared cover (18b) is integrally connected to the inner edge of the flat pad (18a), and the large end flips outward and continues to arc-shaped roll towards the flat pad (18a). The flat pad (18a) is used to fix the bottom of the annular groove, and the arc-shaped convex surface of the flared cover (18b) is used to abut against the end face of the adjusting cap (17).

9. A blackbody temperature calibrator according to claim 1, characterized in that, The plunger section (10) has an annular cooling chamber (22) inside the end near the graphite tube (1), and the cooling chamber (22) is filled with circulating coolant. The cooling chamber (22) is connected to the circulation chamber (29) of the heat sink (3) for containing coolant through a number of cooling channels (23); all cooling channels (23) are L-shaped and pass through the position between the strip cavity and the slide column (11).

10. A blackbody temperature calibrator according to claim 1, characterized in that, The adjusting cap (17) is coaxially provided with a fastening sleeve (24) on the outside. The fastening sleeve (24) is threadedly fitted onto the free end of the heat sink (3), and one end of the fastening sleeve (24) is located inside the heat sink (3) and axially presses the insert block to achieve contact between the insert block and the positioning step surface. The right end of the fastening sleeve (24) on the right insert block (9) is closed to form a cover-like structure that closes the right port of the heat sink (3), and the radiation thermometer (7) to be tested is placed in the fastening sleeve (24); the left insert block (8) is provided with an exhaust hole, which is sealed with a screw plug so that when the graphite tube (1) is purged with argon gas, the exhaust gas is purged through the exhaust hole.

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