Constant temperature device for sheathed thermocouple calibration

Abstract

The utility model relates to the field of sheathed thermocouples, and particularly discloses a constant temperature device for sheathed thermocouple calibration, which comprises a calibration furnace; the furnace tube is arranged in the calibration furnace; the temperature equalizing block is arranged in the center of the furnace tube; measuring ends of a thermocouple to be calibrated and a standard thermocouple are mounted in the temperature equalizing block; the adjusting assembly is used for installing the temperature equalizing block in the furnace tube; the adjusting assembly comprises a first positioning disc arranged in the furnace tube and fixedly connected with the temperature equalizing block; the second positioning disc is arranged on the calibration furnace; the plugging disc is fixedly arranged on the second positioning disc, and the plugging disc is located in the furnace tube; the moving rod penetrates through the second positioning disc, and one end of the moving rod extends into the first positioning disc. The method has the effect of improving the calibration efficiency.

Description

Technical Field

[0001] This application relates to the field of armored thermocouples, and in particular to a constant temperature device for calibrating armored thermocouples. Background Technology

[0002] The thermocouple calibration furnace is a commonly used temperature control device in temperature calibration systems. Because nickel has excellent thermal conductivity, the thermocouple furnace is made of nickel-based high-temperature alloy. Positioned at the geometric center of the furnace, it provides a uniform temperature field for calibrating armored thermocouples. Technical requirements for the thermocouple furnace: temperature range 300℃~1200℃; temperature difference within 30mm axially from the bottom of the borehole not exceeding 0.5℃; absolute temperature difference between any boreholes on the same cross-section at the bottom of the borehole not exceeding 0.25℃.

[0003] There are generally two design schemes for constant temperature devices. One is to drill calibration holes on one side of the constant temperature device, and select the diameter of the calibration hole according to the diameter of the sensor. This type of constant temperature device is suitable for dry well metrology furnaces. The other is to drill calibration holes on both sides of the constant temperature device. This type of constant temperature device is suitable for tubular calibration furnaces. Usually, there are 4 to 5 calibration holes on one side of the constant temperature device, with a hole depth of 30 mm, which can calibrate 2 to 3 thermocouples at a time.

[0004] The problems with the above method are as follows: When the armored thermocouple calibration device is working, the standard thermocouple and the armored thermocouple to be calibrated are usually inserted into the calibration hole of the constant temperature device, and all thermocouples are inserted to the same depth. The thermocouples are calibrated by comparison. Due to the limitations of the calibration hole diameter and depth, the armored thermocouple to be calibrated can only be newly made. Subsequent calibrations (used) armored thermocouples are difficult to calibrate due to irregularities at the measuring ends, etc. Furthermore, the calibration efficiency of the existing armored thermocouple technology is low. Utility Model Content

[0005] To address the issue of improving calibration efficiency, this application provides a constant temperature device for calibrating armored thermocouples.

[0006] The constant temperature device for calibrating armored thermocouples provided in this application adopts the following technical solution:

[0007] include:

[0008] Calibration furnace;

[0009] Furnace tubes are installed inside the calibration furnace;

[0010] A temperature equalization block is located at the center of the furnace tube; the measuring ends of the thermocouple to be calibrated and the standard thermocouple are installed inside the temperature equalization block.

[0011] An adjustment assembly is used to install the temperature equalization block inside the furnace tube;

[0012] The adjustment components include:

[0013] The first positioning plate is located inside the furnace tube and is fixedly connected to the temperature equalization block;

[0014] The second positioning plate is located on the calibration furnace;

[0015] The sealing plate is fixedly mounted on the second positioning plate, and the sealing plate is located inside the furnace tube;

[0016] The moving rod passes through the second positioning plate, with one end extending into the first positioning plate.

[0017] By adopting the above technical solution, the moving rod is pulled / pushed to move the first positioning plate, which in turn moves the temperature equalization block to the inside / outside of the furnace tube. The distance of the temperature equalization block can be adjusted to better adapt to standard couples of different sizes and improve calibration efficiency.

[0018] In one possible implementation, a temperature controller is installed on the outer wall of the calibration furnace, and a temperature control coupler and an electric heating wire are provided on the furnace tube. The output end of the temperature control coupler is electrically connected to the input and output ends of the temperature controller, and the output end of the temperature controller is electrically connected to the input end of the electric heating wire.

[0019] In one possible implementation, a protective tube is fitted around the outside of the standard thermocouple, and the measuring ends of the thermocouple to be calibrated are evenly distributed around the protective tube and bundled into thermocouple bundles by nickel-chromium wire; the reference end of each bundle is located on the side outside the furnace tube and connected to a compensating wire, and the extension wire at the end of the bundle is placed inside a freezing point thermostat, which is connected to an electrical measuring device through a wire.

[0020] In one possible implementation, the temperature equalization block is provided with a retaining ring, and the first positioning plate is provided with an annular groove that cooperates with the retaining ring.

[0021] In one possible implementation, a cavity is provided on the first positioning plate, a first connecting plate is installed in the cavity, a first connecting block is fixedly provided on the first connecting plate, and a pressing plate is provided on the first connecting block, with one end of the pressing plate abutting against a retaining ring.

[0022] In one possible implementation, the first positioning disk has a through groove communicating with the cavity, and a driving member for driving the first connecting plate to move is provided in the through groove. The first positioning disk has an opening communicating with the cavity, and a first connecting ring is provided at the opening. One end of the first connecting ring is fixedly connected to the first connecting block, and an elastic member is provided between the first connecting plate and the cavity.

[0023] In one possible implementation, the driving element includes:

[0024] The second connecting plate is movably installed in the through groove;

[0025] The second connecting block is fixedly mounted on the second connecting plate;

[0026] The second connecting ring is fixedly mounted on the second connecting block;

[0027] The first connecting plate is provided with a first inclined surface, and the second connecting plate is provided with a second inclined surface that cooperates with the first inclined surface.

[0028] In one possible implementation, a first sealing ring is fitted onto the outer wall of the first positioning disk.

[0029] In one possible implementation, a second sealing ring is fitted onto the outer wall of the sealing disc.

[0030] In one possible implementation, the diameter of the sealing disc is smaller than the diameter of the first positioning disc, and the diameter of the first positioning disc is smaller than the diameter of the second positioning disc.

[0031] In summary, this application includes the following beneficial technical effects: by pulling / pushing the moving rod, the moving rod drives the first positioning plate to move, the first positioning plate drives the temperature equalization block to move inside / outside the furnace tube, and the distance of the temperature equalization block can be adjusted, thereby better adapting to standard couples of different sizes and improving calibration efficiency. Attached Figure Description

[0032] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0033] Figure 2 yes Figure 1 An enlarged schematic diagram of part A;

[0034] Figure 3 yes Figure 2 An enlarged schematic diagram of part B.

[0035] Reference numerals: 1. Calibration furnace; 2. Furnace tube; 3. Irradiation block; 4. Couple bundle; 5. Temperature controller; 6. Freezing point thermostat; 7. Electrical measuring equipment; 8. Thermal shield; 9. Thermocouple to be calibrated; 10. Compensating wire; 11. First positioning plate; 12. Second positioning plate; 13. Sealing plate; 14. Moving rod; 15. First sealing ring; 16. Second sealing ring; 17. Snap ring; 18. Annular groove; 19. Cavity; 20. First connecting plate; 21. First connecting block; 22. Extrusion plate; 23. Through groove; 24. First connecting ring; 25. Elastic element; 26. Second connecting plate; 27. Second connecting block; 28. Second connecting ring; 29. ​​First inclined section; 30. Second inclined section; 31. Slider; 32. Slide groove. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0037] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0038] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0039] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] Reference Figure 1-3A constant temperature device for calibrating armored thermocouples includes a calibration furnace 1, a furnace tube 2, a temperature equalization block 3, an adjustment assembly, a thermocouple bundle 4, a temperature controller 5, a freezing point thermostat 6, electrical measuring equipment 7, and a thermal shield 8. The calibration furnace 1 contains the furnace tube 2, and the temperature controller 5 is mounted on its outer wall. The furnace tube 2 is equipped with a temperature-controlled thermocouple and an electric heating wire. The output of the temperature-controlled thermocouple is electrically connected to the input and output of the temperature controller 5, and the output of the temperature controller 5 is electrically connected to the input of the electric heating wire. The temperature controller 5 adjusts its output based on the measured temperature of the temperature-controlled thermocouple, comparing it with a set temperature, thereby adjusting the output of the electric heating wire. The output power is provided by a temperature equalization block 3 located at the center of the furnace tube 2. The temperature equalization block 3 contains the measuring ends of the thermocouple to be calibrated 9 and the standard thermocouple. A protective tube is fitted around the standard thermocouple. The measuring ends of the thermocouple to be calibrated 9 are evenly distributed around the protective tube and bundled into thermocouple bundles 4 by nichrome wire. The reference end of each bundle 4 is located on the outside of the furnace tube 2 and connected to a compensating wire 10. The extension wire at the end of the bundle 4 is placed inside a freezing point thermostat 6. The freezing point thermostat 6 is connected to an electrical measuring device 7 via a wire. A thermal shield 8 is installed on the outer wall of the calibration furnace 1, with one end of the bundle 4 passing through the thermal shield 8. The temperature controller 5, freezing point thermostat 6, electrical measuring device 7, and thermal shield 8 are all existing technologies and can be commercially available products. Therefore, their structures are the same as those in existing technologies, as detailed in publication number CN202122493821.1, and will not be elaborated further. An adjustment assembly is used to install the temperature equalization block 3 inside the furnace tube 2. Specifically, the adjustment assembly includes a first positioning plate 11, a second positioning plate 12, a sealing plate 13, and a moving rod 14. The first positioning plate 11 is located inside the furnace tube 2 and is fixedly connected to the uniform temperature block 3. The second positioning plate 12 is located on the calibration furnace 1. The sealing plate 13 is fixedly located on the second positioning plate 12 and is located inside the furnace tube 2. The moving rod 14 passes through the second positioning plate 12 and extends one end into the first positioning plate 11. The moving rod 14 has graduations. The diameter of the sealing plate 13 is smaller than the diameter of the first positioning plate 11, and the diameter of the first positioning plate 11 is smaller than the diameter of the second positioning plate 12. By pulling / pushing the moving rod 14, the moving rod 14 moves the first positioning plate 11, which in turn moves the uniform temperature block 3 to the inside / outside of the furnace tube 2. The distance of the uniform temperature block 3 can be adjusted to better adapt to standard couples of different sizes and improve calibration efficiency.

[0041] A first sealing ring 15 is fitted on the outer wall of the first positioning plate 11, and a second sealing ring 16 is fitted on the outer wall of the sealing plate 13. Under the action of the first sealing ring 15 and the second sealing ring 16, the first positioning plate 11 and the sealing plate 13 are tightly fitted to the inner wall of the calibration furnace 1, reducing the heat loss from the furnace opening of the calibration furnace 1.

[0042] The temperature equalization block 3 is provided with a retaining ring 17, and the first positioning plate 11 is provided with an annular groove 18 that cooperates with the retaining ring 17.

[0043] The first positioning plate 11 has a cavity 19, and a first connecting plate 20 is installed inside the cavity 19. A first connecting block 21 is fixedly installed on the first connecting plate 20, and a pressing plate 22 is installed on the first connecting block 21. One end of the pressing plate 22 abuts against the retaining ring 17.

[0044] The first positioning plate 11 has a through groove 23 communicating with the cavity 19. A driving component for moving the first connecting plate is located within the through groove 23. The first positioning plate 11 also has an opening communicating with the cavity 19, at which a first connecting ring 24 is located. One end of the first connecting ring 24 is fixedly connected to the first connecting block 21. An elastic element 25, which is a spring, is located between the first connecting plate 20 and the cavity 19. Specifically, the driving component includes a second connecting plate 26, a second connecting block 27, and a second connecting ring 28. The second connecting plate 26 is movably disposed within the through groove 23, the second connecting block 27 is fixedly disposed on the second connecting plate 26, and the second connecting ring 28 is fixedly disposed on the second connecting block 27. The first connecting plate 20 has a first inclined surface 29, the second connecting plate 26 has a second inclined surface 30 that cooperates with the first inclined surface 29, and the second connecting plate 26 has a slider 31. The first positioning plate 11 has a sliding groove 32 that cooperates with the locking block. By pressing the second connecting ring 28, the second connecting plate 26 is moved. Due to the cooperation of the first inclined part 29 and the second inclined part 30, the first connecting plate 20 is moved. The first connecting plate 20 drives the first connecting block 21 and the pressing plate 22, so that the pressing plate 22 does not abut against the retaining ring 17, thereby facilitating the removal of the temperature equalization block 3 from the first positioning plate 11.

[0045] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0046] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A constant temperature device for calibrating armored thermocouples, comprising: Calibration furnace (1); Furnace tube (2) is installed inside the calibration furnace (1); A temperature equalization block (3) is located at the center of the furnace tube (2); the temperature equalization block (3) contains the measuring ends of the thermocouple to be calibrated (9) and the standard thermocouple. Its features are: The constant temperature device for calibrating armored thermocouples also includes: An adjustment assembly is used to install the temperature equalization block (3) inside the furnace tube (2); The adjustment component includes: The first positioning plate (11) is located inside the furnace tube (2) and is fixedly connected to the temperature equalization block (3); The second positioning plate (12) is disposed on the calibration furnace (1); The sealing plate (13) is fixedly mounted on the second positioning plate (12), and the sealing plate (13) is located inside the furnace tube (2); The moving rod (14) passes through the second positioning disk (12) and extends one end into the first positioning disk (11).

2. The constant temperature device for calibrating armored thermocouples according to claim 1, characterized in that: A temperature controller (5) is installed on the outer wall of the calibration furnace (1). A temperature control coupler and an electric heating wire are provided on the furnace tube (2). The output end of the temperature control coupler is electrically connected to the input end of the temperature controller (5), and the output end of the temperature controller (5) is electrically connected to the input end of the electric heating wire.

3. The constant temperature device for calibrating armored thermocouples according to claim 2, characterized in that: The standard thermocouple is fitted with a protective tube. The measuring ends of the thermocouple to be calibrated (9) are evenly distributed around the protective tube and bundled into thermocouple bundles (4) by nickel-chromium wire. The reference end of each bundle (4) is located on the side outside the furnace tube (2) and connected to a compensating wire (10). The extension wire at the end of the bundle (4) is placed inside the freezing point thermostat (6). The freezing point thermostat (6) is connected to the electrical measuring device (7) through a wire.

4. The constant temperature device for calibrating armored thermocouples according to claim 1, characterized in that: The temperature equalization block (3) is provided with a retaining ring (17), and the first positioning plate (11) is provided with an annular groove (18) that cooperates with the retaining ring (17).

5. The constant temperature device for calibrating armored thermocouples according to claim 4, characterized in that: The first positioning plate (11) has a cavity (19) and a first connecting plate (20) is installed inside the cavity (19). A first connecting block (21) is fixedly provided on the first connecting plate (20) and a pressing plate (22) is provided on the first connecting block (21). One end of the pressing plate (22) abuts against the retaining ring (17).

6. The constant temperature device for calibrating armored thermocouples according to claim 5, characterized in that: The first positioning disk (11) has a through groove (23) that communicates with the cavity (19). The through groove (23) has a driving member for driving the first connecting plate to move. The first positioning disk (11) has an opening that communicates with the cavity (19). A first connecting ring (24) is provided at the opening. One end of the first connecting ring (24) is fixed to the first connecting block (21). An elastic member (25) is provided between the first connecting plate (20) and the cavity (19).

7. The constant temperature device for calibrating armored thermocouples according to claim 6, characterized in that: The driving component includes: The second connecting plate (26) is movably disposed within the through groove (23); The second connecting block (27) is fixedly mounted on the second connecting plate (26); The second connecting ring (28) is fixedly mounted on the second connecting block (27); The first connecting plate (20) is provided with a first inclined surface (29), and the second connecting plate (26) is provided with a second inclined surface (30) that cooperates with the first inclined surface (29).

8. The constant temperature device for calibrating armored thermocouples according to claim 7, characterized in that: A first sealing ring (15) is fitted on the outer wall of the first positioning disk (11).

9. The constant temperature device for calibrating armored thermocouples according to claim 1, characterized in that: A second sealing ring (16) is fitted on the outer wall of the sealing disc (13).

10. The constant temperature device for calibrating armored thermocouples according to claim 1, characterized in that: The diameter of the sealing disc (13) is smaller than the diameter of the first positioning disc (11), and the diameter of the first positioning disc (11) is smaller than the diameter of the second positioning disc (12).

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