Double-core precious metal thermocouple structure

Abstract

The utility model provides a double-core precious metal thermocouple structure, which comprises a wiring platform, a thermocouple assembly, a wiring assembly and a shell assembly, the wiring platform is respectively provided with two thermocouple mounting holes and a second test hole, the thermocouple mounting holes and the second test hole respectively penetrate through the wiring platform along a first direction, and the two thermocouple mounting holes are communicated with the wiring assembly. The thermocouple assembly comprises a thermocouple insulation tube, a thermocouple wire, an inner protection tube and a standard thermocouple, the inner protection tube is installed in the thermocouple installation hole, and the inner protection tube is of a hollow structure; two thermocouple wire penetrating holes are formed in the thermocouple insulating tube in a penetrating mode in the first direction. A standard thermocouple for testing the system precision is detachably inserted into the second test hole; two paths of independent temperature signals can be effectively measured and output through a double-core structure; and difficulty and time consumption caused by frequent wire threading after the whole device is disassembled during maintenance and thermocouple wires are drawn out are avoided.

Description

Technical Field

[0001] This utility model relates to the field of thermocouple technology, specifically providing a dual-core noble metal thermocouple structure. Background Technology

[0002] Precious metal thermocouples typically operate in the temperature range of 300℃ to 1500℃ and are a type of temperature sensor widely used in industrial settings, primarily for measuring the temperature of heating furnaces.

[0003] Most existing thermocouples with dual-core adapters have a fixed dual-core structure, meaning that the thermocouple wires are fixedly assembled and connected to the insulating tube after leaving the factory, and sometimes even permanently assembled using adhesives. The dual-core design of thermocouples aims to ensure that the reliable temperature measurement process of the heating furnace will not be interrupted when one of the dual-core thermocouples shows signs of instability or even fails. The fixed structure of dual-core thermocouples causes problems with the inconvenience of disassembling and assembling the thermocouple wires. The usual procedure requires completely disassembling the thermocouple kit, inserting the thermocouple wires into the insulating tube and then into the inner protective tube, then fixing them into the corundum terminal, and finally crimping the thermocouple wires to the electrode terminals of the corundum terminal before use. The process is very cumbersome and almost impossible for non-professionals to complete independently and quickly.

[0004] Meanwhile, the existing crimping method between the reference end of the thermocouple wire and the terminal block may damage the soft, precious metal thermocouple wire, which means that when the thermocouple wire is reconnected and reused, the damaged part must be cut off, thus affecting the reuse value of the thermocouple wire at the original work station.

[0005] Accordingly, there is a need in the field for a new dual-core noble metal thermocouple structure to solve the above-mentioned technical problems. Utility Model Content

[0006] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem of the difficulty in replacing existing thermocouple structures.

[0007] This utility model provides a dual-core noble metal thermocouple structure, including a terminal block, a thermocouple assembly, a wiring assembly, and a housing assembly, wherein:

[0008] The wiring platform is provided with a thermocouple mounting hole and a second test hole, which are respectively provided through the wiring platform along a first direction. There are two thermocouple mounting holes to form a dual-core structure.

[0009] The thermocouple assembly includes a thermocouple insulating tube, thermocouple wires, an inner protective tube, and a standard thermocouple. The inner protective tube is installed in the thermocouple mounting hole and has a hollow structure for detachably inserting into the thermocouple insulating tube for quick removal. Two thermocouple wire insertion holes are formed inside the thermocouple insulating tube along a first direction for inserting and installing the thermocouple wires. A standard thermocouple is detachably inserted into the second test hole.

[0010] The wiring assembly includes terminals, a positive quick-connect plug, a negative quick-connect plug, and a thermocouple clamping cover. Two terminals are provided, each mounted on a wiring platform and configured as a positive terminal and a negative terminal, respectively. A positive quick-connect plug is mounted on the positive terminal, and a negative quick-connect plug is mounted on the negative terminal. The thermocouple clamping cover is mounted on the terminals and is used to clamp and connect the thermocouple wires.

[0011] The housing assembly is fitted onto the outside of the terminal block, and the thermocouple assembly extends along a first direction inside the housing assembly.

[0012] Based on the above setup, the dual-core structure can effectively measure and output two independent temperature signals. The thermocouple insulating tubes form a relatively stable assembly relationship, and in daily use, they are treated as a whole. First, the welded and calibrated thermocouple wires are threaded into the insulating tube. The assembled insulating tube is then inserted into the inner protective tube. One side of the welded joint is used as the measuring end, and the other side of the wire is used as the reference end and connected to the terminal block. This completes the assembly of one thermocouple wire. When thermocouple wires are assembled in both thermocouple insulating tubes simultaneously, it is a dual-core structure. Alternatively, one of the two thermocouple insulating tubes can be assembled with a thermocouple wire separately, which is a single-core structure, allowing for flexible use. If necessary, only the thermocouple insulating tube needs to be removed for replacement, avoiding the difficulty and time consumption of disassembling the entire device, removing the thermocouple wires, and repeatedly threading them during maintenance.

[0013] In the preferred embodiment of the above detection structure, the mounting structure of the thermocouple clamping cover and the wiring terminal is an embedded structure.

[0014] Based on the above configuration, the embedded structure of the thermocouple clamping cover and the terminal block simplifies the assembly process of the thermocouple and the terminal block, while maintaining good conductivity and stable connection during long-term operation, thereby reducing operation difficulty and maintenance time; it also avoids unnecessary metal stress caused by thermocouple wire deformation, thereby reducing maintenance frequency and improving system stability and reliability.

[0015] In the preferred embodiment of the above thermocouple structure, the wiring assembly further includes a standard thermocouple male connector for SAT and a compensating wire connector. The standard thermocouple male connector is connected to the female connector included in the standard thermocouple compensating wire, and the compensating wire connector is connected to the positive quick connector and the negative quick connector, respectively.

[0016] Based on the above settings, end users can more easily replace or connect this device on-site, which makes on-site maintenance simple and quick, shortens equipment downtime, and reduces operating costs.

[0017] In the preferred embodiment of the above thermocouple structure, the terminals are further provided with compensating wire screws and thermocouple wire clamping screws, and the compensating wire screws and thermocouple wire clamping screws are respectively provided with clamping plates for clamping or loosening the thermocouple wires and the compensating wires.

[0018] Based on the above settings, users can easily adjust the contact pressure of the thermocouple wires and compensating wires as needed. This ensures excellent electrical contact performance under different operating conditions, thereby guaranteeing high-precision temperature measurement. Furthermore, the clamping plate prevents uneven tightening pressure on the thermocouple wires during screw tightening, thus preventing damage and extending their service life. After removing the thermocouple insulation tube, the thermocouple wires connected to the terminals can be disconnected. Because the thermocouple wires are protected by the clamping plate, the original terminal end of the thermocouple wire can be used directly as the measuring end. This allows a set of thermocouple wires to be disassembled and reused twice without losing material length, further improving their service life.

[0019] In the preferred embodiment of the above thermocouple structure, the housing assembly includes an outer protective tube and a housing. The terminal block is disposed at one end inside the housing along a first direction. The housing extends along the first direction to the other end and is connected to the outer protective tube. The inner protective tube and the standard thermocouple both extend through the housing into the outer protective tube.

[0020] Based on the above settings, the entire thermocouple structure is more compact, and the impact of external influences such as dust, moisture and mechanical vibration on the measurement is reduced, thereby improving the service life of the thermocouple and the reliability of the measurement.

[0021] In the preferred embodiment of the above thermocouple structure, the outer protective tube is a triangular structure with the edges connected in an arc shape.

[0022] Based on the above design, not only is the aesthetics improved, but the structural strength is also enhanced. This design can better resist mechanical and thermal stresses, thus ensuring the normal operation of the equipment in harsh environments.

[0023] In the preferred embodiment of the above thermocouple structure, a plurality of connecting blocks are further provided inside the housing, and slots that cooperate with the connecting blocks are formed on the terminal block so that the terminal block is fixed inside the housing.

[0024] Based on the above settings, the junction box can be accurately and securely positioned within the housing. This design prevents the junction box from shifting during installation and long-term operation, ensuring stable signal transmission.

[0025] In the preferred embodiment of the above thermocouple structure, a reserved mounting position is also formed on the terminal block for installing a spare terminal block.

[0026] Based on the above settings, on-site personnel can easily add or replace terminal blocks. This flexibility is very important in industrial environments, as it allows the equipment to adapt to different configuration requirements.

[0027] In the preferred embodiment of the above-mentioned thermocouple structure, a groove structure is formed on the top of the terminal, and protrusions that cooperate with the groove are formed on both sides of the thermocouple clamping cover plate for positioning the thermocouple clamping cover plate on the terminal.

[0028] Based on the above configuration, the wire cover plate can be precisely installed on the terminal block. This design helps reduce installation errors and ensures a stable connection over a long period of time.

[0029] In the preferred embodiment of the above thermocouple structure, the terminal block is further provided with a mounting groove for connecting to an external thermocouple frame.

[0030] Based on the above configuration, the thermocouple frame can be easily connected to external devices or systems. This design facilitates integration and installation, reduces the complexity of on-site configuration, and makes it easier to connect the equipment to control systems or data acquisition systems. Attached Figure Description

[0031] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0032] Figure 1 A schematic diagram of the structure of the junction box of this utility model is shown;

[0033] Figure 2 A schematic diagram of the outer shell and outer protective tube structure of this utility model is shown;

[0034] Figure 3 A schematic diagram of the overall structure of this utility model is shown.

[0035] Figure label:

[0036] 1. Thermocouple wire insertion hole; 2. Thermocouple wire clamping screw; 3. Positive terminal; 4. Positive quick plug; 5. Negative quick plug; 6. Negative terminal; 7. Compensating wire screw; 8. Thermocouple clamping cover plate; 9. Reserved installation position; 10. Inner protective tube; 11. Thermocouple insulation tube; 12. Second test hole; 13. Terminal block; 14. Mounting slot; 15. Connecting block; 16. Outer protective tube; 17. Housing; 18. Standard thermocouple; 19. Standard thermocouple male connector; 20. Compensating wire connector. Detailed Implementation

[0037] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0038] It should be noted that in the description of this utility model, the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the structure must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] First refer to Figure 1 ,like Figure 1As shown, this utility model provides a dual-core precious metal thermocouple structure. The detection structure includes a terminal block 13, a thermocouple assembly, a wiring assembly, and a housing assembly. It should be noted that this utility model does not impose any limitations on the specific structure of the terminal block 13; those skilled in the art can set it according to their needs. For example, the terminal block 13 can be a circular platform, or it can be a square platform, as long as there is sufficient space for the terminal block 13. Specifically, the terminal block 13 has thermocouple mounting holes and a second test hole 12, which penetrate the terminal block 13 along a first direction. There are two thermocouple mounting holes to form a dual-core structure. It should be noted that this utility model does not impose any limitations on the specific number of thermocouple mounting holes and the second test hole 12; those skilled in the art can set them according to their needs, as long as it does not affect the normal testing operation of the equipment. In this preferred embodiment, the two thermocouple mounting holes are flush to balance the stress state within the two thermocouple mounting holes during long-term use.

[0041] The thermocouple assembly includes a thermocouple insulating tube 11, thermocouple wires, an inner protective tube 10, and a standard thermocouple 18. The inner protective tube 10, which is hollow, is installed inside the thermocouple mounting hole for detachable insertion of the thermocouple insulating tube 11, allowing for quick removal of the thermocouple insulating tube 11. It should be noted that this invention does not impose any restrictions on the specific material of the inner protective tube 10; those skilled in the art can set it according to their needs, as long as the inner protective tube 10 provides good insulation protection for the thermocouple wires. In this preferred embodiment, the inner protective tube 10 is an insulating tube made of corundum. Two wire insertion holes 1 are formed inside the thermocouple insulating tube 11 along a first direction for inserting and installing the thermocouple wires. A standard thermocouple 18 is detachably inserted into the second test hole 12. In this preferred embodiment, the standard thermocouple 18 is a SAT thermocouple required for system accuracy testing in AMS2750 or system accuracy verification in GBT 30825.

[0042] The wiring assembly includes terminals, quick-connect plugs, and a thermocouple clamping cover 8. Two terminals are provided, each mounted on a terminal block 13, and are designated as a positive terminal 3 and a negative terminal 6, respectively. Each terminal is connected to a corresponding quick-connect plug. The thermocouple clamping cover 8 is mounted on the terminals to clamp and connect the thermocouple wires. It should be noted that this invention does not impose any restrictions on the installation structure of the thermocouple clamping cover 8 on the terminals; those skilled in the art can design it according to their needs, as long as the thermocouple wires are clamped tightly onto the terminals. In this preferred embodiment, the thermocouple clamping cover 8 has an L-shaped grooved structure. To prevent the thermocouple clamping cover 8 from rotating due to friction during screw tightening, thereby applying frictional tension to the thermocouple wires, the installation structure of the thermocouple clamping cover 8 and the terminals is an embedded structure. The embedded structure of the thermocouple clamping cover 8 and the terminal block simplifies the assembly process of the thermocouple and the terminal block, while maintaining good conductivity and a stable connection during long-term operation, thereby reducing maintenance frequency and improving system stability and reliability. The housing assembly is fitted onto the outside of the terminal block 13, and the thermocouple assembly extends along a first direction inside the housing assembly.

[0043] The dual-core structure effectively measures and outputs two independent temperature signals. The thermocouple insulating tubes 11 form a relatively stable assembly relationship, and in daily use, they are treated as a whole. First, the welded and qualified thermocouple wires are threaded into the insulating tube 11. The insulating tube with the assembled wires is then inserted into the inner protective tube 10. One side of the welded joint is used as the measuring end, and the other side of the wire is used as the reference end and connected to the terminal block. This completes the assembly of one thermocouple wire. When thermocouple wires are assembled in both thermocouple insulating tubes 11 at the same time, it is a dual-core structure. Alternatively, one of the two thermocouple insulating tubes 11 can be assembled with a thermocouple wire separately, which is a single-core structure, allowing for flexible use. If necessary, only the thermocouple insulating tube 11 needs to be removed for replacement, avoiding the difficulty and time consumption of disassembling the entire device, removing the thermocouple wires, and repeatedly threading them during maintenance. This reduces the difficulty of operation and maintenance time, and also avoids unnecessary metal stress caused by thermocouple wire deformation.

[0044] Furthermore, the wiring assembly also includes a standard thermocouple male connector 19 and a compensating wire connector 20. The standard thermocouple male connector 19 mates with a standard thermocouple 18, and the compensating wire connector 20 mates with two quick-connect plugs. It should be noted that this invention does not impose any limitations on the specific structure of the standard thermocouple male connector 19 and the compensating wire connector 20. Those skilled in the art can set them according to their needs. For example, the standard thermocouple male connector 19 and the compensating wire connector 20 can be round plugs, or they can be square plugs, as long as the equipment can be connected and used normally. Furthermore, the compensating wire connector 20 conforms to American and international standards, and its form (including shape and polarity) and coating color are relatively fixed. This design allows end users to more easily replace or connect this equipment in the field, making on-site maintenance simple and quick, shortening equipment downtime, and reducing operating costs. In this preferred embodiment, the standard thermocouple male connector 19 and the standard thermocouple 18 must be made of the same material, and the compensating wire connector 20, the thermocouple wire, and the quick connector must be made of the same material to avoid interference between the thermocouple wire and the standard thermocouple during use.

[0045] Furthermore, the terminals are also equipped with compensating wire screws 7 and coupling wire clamping screws, each with a clamping plate for clamping or loosening the coupling wires and compensating wires. It should be noted that this invention does not impose any limitations on the specific structure of the compensating wire screws 7 and coupling wire clamping screws; those skilled in the art can design them according to their needs, as long as the screw structure of the compensating wire screws 7 and coupling wire clamping screws meets the requirements of this device. This allows users to easily adjust the contact pressure of the thermocouple wire and compensating wire as needed, ensuring excellent electrical contact performance under different operating conditions, thereby guaranteeing high-precision temperature measurement. Furthermore, the clamping plate prevents uneven tightening pressure on the thermocouple wire during screw tightening, thus extending its service life. After removing the thermocouple insulation tube, the thermocouple wire connected to the terminal block can be disconnected. Because the thermocouple wire is protected by the clamping plate, the original terminal block end can be used directly as the test end, allowing a single thermocouple wire to be reused twice, further improving its service life.

[0046] Continue reading Figure 2 , Figure 3 ,like Figure 2 , Figure 3As shown, the housing assembly includes an outer protective tube 16 and a housing 17. A terminal block 13 is disposed at one end inside the housing 17 along a first direction. The housing 17 extends along the first direction to the other end, where the outer protective tube 16 is connected. The inner protective tube 10 and the standard thermocouple 18 both extend through the housing 17 into the outer protective tube 16. It should be noted that this invention does not impose any limitations on the specific structure of the outer protective tube 16. Those skilled in the art may design it according to their needs. For example, the outer protective tube 16 can be a square tube, or it can be a circular tube, as long as it can accommodate the testing equipment. This design makes the entire thermocouple structure more compact, reduces the impact of external influences such as dust, moisture, and mechanical vibration on the measurement, and improves the service life and measurement reliability of the thermocouple. In this preferred embodiment, the outer protective tube 16 is a triangular structure with arc-shaped connections between its sides, which not only improves aesthetics but also enhances structural strength. This design can better resist mechanical and thermal stresses, thereby ensuring the normal operation of the equipment in harsh environments.

[0047] Furthermore, multiple connecting blocks 15 are provided inside the housing 17, and slots are formed on the terminal block 13 to mate with the connecting blocks 15, so that the terminal block 13 is fixed inside the housing 17. This ensures that the terminal block 13 can be accurately and firmly positioned inside the housing 17. This design makes the terminal block 13 less prone to displacement during installation and long-term operation, ensuring stable signal transmission. It should be noted that this utility model does not impose any restrictions on the specific structure of the connecting blocks 15 and the slots. Those skilled in the art can set them according to their needs, as long as the connecting blocks 15 can assist the terminal block 13 in fixing the housing 17.

[0048] Furthermore, the terminal block 13 also has a reserved mounting position 9 for installing a spare terminal block. When both thermocouple mounting holes are simultaneously filled with thermocouple wires to form a dual-core configuration, the spare terminal block is installed in the reserved mounting position to connect the later-installed thermocouple wires. This design allows field personnel to easily add or replace terminal blocks, a flexibility that is crucial in industrial environments, enabling equipment to adapt to different configuration requirements. It should be noted that...

[0049] Furthermore, a groove structure is formed on the top of the terminal block, and protrusions that mate with the groove are formed on both sides of the thermocouple clamping cover plate 8 to position the thermocouple wire cover plate on the terminal block. This allows the thermocouple clamping cover plate 8 to be precisely installed on the terminal block. This design helps reduce installation errors and ensures a stable connection over a long period of time. The terminal block 13 also has a mounting groove 14 for connecting to an external thermocouple frame. This allows the thermocouple frame to be easily connected to external equipment or systems. This design facilitates integration and installation, reduces the complexity of on-site configuration, and makes it easier to connect the equipment to control systems or data acquisition systems.

[0050] The technical solution of this utility model has been described in conjunction with the optional embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A dual-core noble metal thermocouple structure, characterized in that, Includes a junction box, thermocouple assembly, wiring assembly, and housing assembly, wherein: The terminal block is provided with two working thermocouple mounting holes and a second test hole. The thermocouple mounting holes and the second test hole respectively penetrate the terminal block along the first direction. There are two thermocouple mounting holes to form a dual-core structure. The thermocouple assembly includes a thermocouple insulating tube, thermocouple wires, an inner protective tube, and a standard thermocouple. The inner protective tube is installed in the thermocouple mounting hole and has a hollow structure for detachably inserting into the thermocouple insulating tube for quick removal. Two thermocouple wire insertion holes are formed inside the thermocouple insulating tube along a first direction for inserting and installing the thermocouple wires. A standard thermocouple is detachably inserted into the second test hole. The wiring assembly includes terminals, a positive quick-connect plug, a negative quick-connect plug, and a thermocouple clamping cover. Two terminals are provided, each mounted on a wiring platform and configured as a positive terminal and a negative terminal, respectively. A positive quick-connect plug is mounted on the positive terminal, and a negative quick-connect plug is mounted on the negative terminal. The thermocouple clamping cover is mounted on the terminals and is used to clamp and connect the thermocouple wires. The housing assembly is fitted onto the outside of the terminal block, and the thermocouple assembly extends along a first direction inside the housing assembly.

2. The thermocouple structure according to claim 1, characterized in that, The installation structure of the thermocouple clamping cover and the wiring terminal is an embedded structure.

3. The thermocouple structure according to claim 1, characterized in that, The wiring assembly also includes a standard thermocouple male connector and a compensating wire connector. The standard thermocouple male connector is connected to the standard thermocouple. The compensating wire connector is connected to the positive quick connector and the negative quick connector, respectively, so as to connect the thermocouple wire and the compensating wire through the terminal block as a medium.

4. The thermocouple structure according to claim 2, characterized in that, The terminal block is also provided with a compensating wire screw and a coupler wire clamping screw. The compensating wire screw and the coupler wire clamping screw are respectively provided with clamping plates for clamping or loosening the coupler wire and the compensating wire.

5. The thermocouple structure according to claim 1, characterized in that, The housing assembly includes an outer protective tube and a housing. The terminal block is disposed at one end inside the housing along a first direction. The housing extends along the first direction to the other end and is connected to the outer protective tube. The inner protective tube and the standard thermocouple both pass through the housing and extend into the outer protective tube.

6. The thermocouple structure according to claim 5, characterized in that, The outer protective tube is a triangular structure with arc-shaped connections between its sides.

7. The thermocouple structure according to claim 5, characterized in that, The housing also contains a plurality of connecting blocks, and the terminal block has a slot that mates with the connecting blocks so that the terminal block is fixed inside the housing.

8. The thermocouple structure according to claim 1, characterized in that, The terminal block also has a reserved mounting position for installing spare terminal blocks.

9. The thermocouple structure according to claim 1, characterized in that, The top of the terminal block has a groove structure, and both sides of the thermocouple clamping cover plate have protrusions that cooperate with the groove, which are used to position the thermocouple clamping cover plate on the terminal block.

10. The thermocouple structure according to claim 1, characterized in that, The terminal block also has a mounting groove for connecting to an external thermocouple frame.

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