A two-channel N-type thermocouple transmitter with cold junction compensation

Abstract

This invention provides a two-channel N-type thermocouple transmitter with cold junction compensation, comprising a fixed base, a movable base movably mounted on the fixed base, a sliding groove on the movable base, a support mechanism fixed inside the sliding groove, a support component fixed at one end of the support mechanism, and a thermocouple sensor movably mounted between the support components. Both the fixed base and the movable base have arc-shaped grooves on one side, and a cable movably mounted inside the arc-shaped grooves, with one end of the cable mounted on a thermocouple temperature sensor. In this two-channel N-type thermocouple transmitter with cold junction compensation, the thermocouple temperature sensor is movably mounted between the support components during use. The support components press inwards to secure the thermocouple temperature sensor. Depending on the operating environment of the thermocouple temperature sensor, the upper and lower limits of the thermocouple temperature sensor can be achieved by raising the movable plate, and the limiting plate can move to the top of the thermocouple temperature sensor to effectively shield and protect the display mechanism.

Description

Technical Field

[0001] This invention relates to the field of thermocouple transmitter equipment, specifically a two-channel N-type thermocouple transmitter with cold junction compensation. Background Technology

[0002] A thermocouple is a widely used temperature sensor. It generates a thermoelectric potential due to the temperature difference between its hot and cold junctions. A temperature transmitter can amplify and convert this thermoelectric potential into an output current signal, which is then used for transmission and measurement. To ensure that the output of the temperature transmitter is only related to the measured temperature, cold junction temperature compensation measures are required.

[0003] According to the patent document CN217358783U, a two-wire thermocouple temperature transmitter with cold junction temperature compensation is disclosed, which includes a cold junction temperature compensation circuit and an XTR101AP conversion circuit. The A terminal of the thermocouple is connected to the XTR101AP conversion circuit, and the B terminal of the thermocouple is connected to both the cold junction temperature compensation circuit and the XTR101AP conversion circuit. The XTR101AP conversion circuit is also connected to the cold junction temperature compensation circuit. The transmitter further includes a current-amplifying circuit and a reverse connection protection circuit. The current-amplifying circuit is connected to both the XTR101AP conversion circuit and the reverse connection protection circuit. The circuit is also connected to the XTR101AP conversion circuit. When using this technical solution, the XTR101AP chip, a high-precision, low-drift 4-20mA two-wire transmitter, is used. It also innovatively incorporates the AD590 high-precision current-type temperature sensor for precise thermocouple cold junction compensation circuit design, forming a unique and high-performance high-precision cold junction compensated two-wire thermocouple temperature transmitter. However, although this solution achieves cold junction compensation, it cannot achieve quick installation and removal of the thermocouple temperature sensor during use, and it cannot protect the thermocouple temperature sensor, which is inconvenient during use. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a two-channel N-type thermocouple transmitter with cold junction compensation to solve the problems mentioned in the background. The present invention has a novel structure. In use, the thermocouple temperature sensor is movably installed between the support components. The support components press from the outside in to fix the thermocouple temperature sensor. Depending on the operating environment of the thermocouple temperature sensor, the upper and lower limits of the thermocouple temperature sensor can be achieved by raising the movable plate and moving the limiting plate to the top of the thermocouple temperature sensor, effectively shielding and protecting the display mechanism.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a two-channel N-type thermocouple transmitter with cold junction compensation, comprising a fixed base, a movable base movably mounted on the fixed base, a sliding groove formed on the movable base, a support mechanism fixed inside the sliding groove, a support component fixed at one end of the support mechanism, a thermocouple thermometer movably mounted between the support components, an arc-shaped groove formed on one side of both the fixed base and the movable base, a cable movably mounted inside the arc-shaped groove, and one end of the cable being mounted on the thermocouple thermometer.

[0006] Furthermore, the fixed base has an opening, and a fixing screw is rotatably installed inside the opening; the movable base has an opening, and a limit component is movably installed inside the opening.

[0007] Furthermore, the limiting component includes a support box, the top of which has a fixing groove, and the inside of the opening has a slot, which is movable to cooperate with the cable.

[0008] Furthermore, a reset mechanism is fixed inside the fixing groove, one end of the reset mechanism is fixed to the fixing block, and a pressing block is movably installed on the side of the support box.

[0009] Furthermore, one side of the extrusion block is movable and in contact with the cable, one end of the extrusion block is fixed on the fixing block, and a limit groove is opened on the side of the support box.

[0010] Furthermore, a tension mechanism is fixed inside the limiting groove, a limiting block is fixed at one end of the tension mechanism, and a limiting post is fixed on the limiting block.

[0011] Furthermore, an annular groove is formed inside the opening, and the annular groove is movably installed at one end of the limiting post.

[0012] Furthermore, the support assembly includes a support plate, one end of the support mechanism is fixed to the support plate, a protrusion is fixed to the side of the support plate, a groove is opened inside the slide, and the protrusion is movably installed inside the groove.

[0013] Furthermore, the support plate has a support groove on its side, and an elastic mechanism is fixed inside the support groove. A support block is fixed to one end of the elastic mechanism, and a movable plate is fixed to one end of the support block.

[0014] Furthermore, a connecting block is fixed to the top of the movable plate, and a limiting plate is movably installed on the top of the movable plate. A connecting groove is opened on the limiting plate, and the connecting block is movably installed inside the connecting groove.

[0015] The beneficial effects of this invention are:

[0016] 1. A two-channel N-type thermocouple transmitter with cold junction compensation is used in which the thermocouple temperature sensor is movably installed between the support components. The support components press the thermocouple temperature sensor from the outside to the inside to fix it. Depending on the operating environment of the thermocouple temperature sensor, the upper and lower limits of the thermocouple temperature sensor can be achieved by raising the movable plate and moving the limit plate to the top of the thermocouple temperature sensor, thereby effectively shielding and protecting the display mechanism.

[0017] 2. This is a two-channel N-type thermocouple transmitter with cold junction compensation. After the movable plate moves on the support plate, it extends the support area. The movable plate and the support plate cooperate to install and fix thermocouples of different thicknesses. In addition, the arc groove and the slot cooperate to limit and fix the cable. When the cable is fixed by the squeezing block on the support box, the limiting post on the support box cooperates with the ring groove to limit the upper and lower movement of the movable seat. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a two-channel N-type thermocouple transmitter with cold junction compensation according to the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a two-channel N-type thermocouple transmitter with cold junction compensation according to the present invention after the thermocouple temperature sensor has been removed.

[0020] Figure 3 This is a schematic diagram of the structure of a two-channel N-type thermocouple transmitter with cold junction compensation according to the present invention after the movable base has been removed.

[0021] Figure 4 This is a side cross-sectional view of the movable base of a two-channel N-type thermocouple transmitter with cold junction compensation according to the present invention.

[0022] Figure 5 This is a schematic diagram of the support assembly for a two-channel N-type thermocouple transmitter with cold junction compensation according to the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the movable plate of a two-channel N-type thermocouple transmitter with cold junction compensation according to the present invention.

[0024] In the diagram: 1. Fixed seat; 2. Movable seat; 3. Slide groove; 4. Support mechanism; 5. Support assembly; 6. Coil thermometer; 7. Arc groove; 8. Cable; 9. Opening; 10. Slot; 11. Limiting assembly; 12. Fixing screw; 13. Opening; 14. Support box; 15. Fixed groove; 16. Fixed block; 17. Limiting groove; 18. Tension mechanism; 19. Limiting block; 20. Limiting post; 21. Extrusion block; 22. Annular groove; 23. Support plate; 24. Support groove; 25. Elastic mechanism; 26. Support block; 27. Protrusion; 28. Movable plate; 29. ​​Limiting plate; 30. Connecting block; 31. Reset mechanism. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Please see Figures 1 to 6 This invention provides a technical solution: a two-channel N-type thermocouple transmitter with cold junction compensation, comprising a fixed base 1, a movable base 2 movably mounted on the fixed base 1, a sliding groove 3 on the movable base 2, a support mechanism 4 fixed inside the sliding groove 3, a support component 5 fixed at one end of the support mechanism 4, a thermocouple thermometer 6 movably mounted between the support components 5, an arc-shaped groove 7 on one side of both the fixed base 1 and the movable base 2, a cable 8 movably mounted inside the arc-shaped groove 7, one end of the cable 8 being mounted on the thermocouple thermometer 6, an opening 13 on the fixed base 1, a fixing screw 12 rotatably mounted inside the opening 13, an opening 9 on the movable base 2, a limit component 11 movably mounted inside the opening 9, and a support spring for the support mechanism 4, which pushes a support plate 23 inward to compress and fix the thermocouple thermometer 6.

[0027] In this embodiment, the limiting component 11 includes a support box 14. The top of the support box 14 has a fixing groove 15, and the inside of the opening 9 has a slot 10. The slot 10 is movably engaged with the cable 8. A reset mechanism 31 is fixed inside the fixing groove 15. One end of the reset mechanism 31 is fixed to the fixing block 16. A pressing block 21 is movably installed on the side of the support box 14. One side of the pressing block 21 is movably in contact with the cable 8, and one end of the pressing block 21 is fixed to the fixing block 16. A limiting groove 17 is opened on the side of the support box 14. The reset mechanism 31 is a reset spring. The reset spring pushes the fixing block 16 to move. The movement of the fixing block 16 pushes the pressing block 21 to complete the pressing and fixing of the cable 8 inside the slot 10.

[0028] In this embodiment, a tension mechanism 18 is fixed inside the limiting groove 17, a limiting block 19 is fixed at one end of the tension mechanism 18, a limiting post 20 is fixed on the limiting block 19, an annular groove 22 is opened inside the opening 9, the annular groove 22 is movably installed at one end of the limiting post 20, the support assembly 5 includes a support plate 23, one end of the support mechanism 4 is fixed on the support plate 23, a protrusion 27 is fixed on the side of the support plate 23, a groove is opened inside the sliding groove 3, the protrusion 27 is movably installed inside the groove, the movable seat 2 rotates on the limiting post 20 through the annular groove 22, and the rotation is buffered by the collision of the movable seat 2.

[0029] In this embodiment, the support plate 23 has a support groove 24 on its side. An elastic mechanism 25 is fixed inside the support groove 24. A support block 26 is fixed to one end of the elastic mechanism 25. A movable plate 28 is fixed to one end of the support block 26. A connecting block 30 is fixed to the top of the movable plate 28. A limiting plate 29 is movably installed on the top of the movable plate 28. A connecting groove is opened on the limiting plate 29. The connecting block 30 is movably installed inside the connecting groove. The elastic mechanism 25 is a spring. The spring pushes the limiting post 20 to move downward. The downward movement of the limiting post 20 squeezes the movable seat 2 and the fixed seat 1 closer together. The arc groove 7 between the movable seat 2 and the fixed seat 1 completes the compression and fixing of cables 8 of different diameters.

[0030] In use, the device involves installing the thermocouple 6 between the support components 5. The support plate 23 on the support component 5 moves outward under the support of the thermocouple 6. As the support plate 23 moves outward, it presses against the support mechanism 4. The deformation of the support mechanism 4 provides space for the movement of the support plate 23. The opposing force of the support mechanism 4 pushes the support plate 23 to press and fix the thermocouple 6. When the thickness of the thermocouple 6 exceeds the height of the support plate 23, the movable plate 28 moves upward via the support block 26. After the movable plate 28 moves upward, the limiting plate 29 moves horizontally to the top of the thermocouple 6. Once the limiting plate 29 is on the thermocouple 6, it shields and protects the display screen. The movable plate 28 provides limiting support force through the limiting plate 29, preventing the movable plate 28 from moving downward back to its original position. The support plate 23 and the movable plate 28 work together to press and fix the thermocouple 6 and provide shielding protection. After the thermocouple 6 is installed on the support component 5... The movable seat 2 is moved upward, and the movable seat 2 pushes the limiting post 20 upward through the annular groove 22 to rise inside the limiting groove 17. The movable seat 2 rises synchronously with the limiting post 20. After rising, the gap width between the movable seat 2 and the fixed seat 1 increases. The cables 8 on the thermocouple 6 are installed inside the slot 10. After the cables 8 are installed inside the slot 10, one side of the cables 8 is squeezed by the extrusion block 21. After squeezing, the extrusion block 21 squeezes and fixes the cables 8 by the tension generated by the reset mechanism 31. One end of the cables 8 is installed inside the arc groove 7 and moves outward continuously. After the cables 8 are installed inside the arc groove 7, the movable seat 2 is released. The movable seat 2 and the fixed seat 1 fix the cables 8. A temperature sensor is installed at one end of the cables 8. The temperature sensor is installed inside the temperature field being measured. A cold junction temperature compensation circuit is installed inside the thermocouple 6. The cold junction temperature compensation circuit reduces the error of the cold junction temperature and provides the accuracy of the measured data.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A two-channel N-type thermocouple transmitter with cold junction compensation, comprising a mounting base (1), characterized in that: A movable seat (2) is movably mounted on the fixed seat (1). A sliding groove (3) is opened on the movable seat (2). A support mechanism (4) is fixed inside the sliding groove (3). A support component (5) is fixed at one end of the support mechanism (4). A thermocouple thermometer (6) is movably mounted between the support components (5). An arc-shaped groove (7) is opened on one side of both the fixed seat (1) and the movable seat (2). A cable (8) is movably mounted inside the arc-shaped groove (7). One end of the cable (8) is mounted on the thermocouple thermometer (6). An opening (9) is opened on the movable seat (2). A limiting component (11) is movably mounted inside the opening (9). The limiting component (11) includes a support box (14). A fixing groove (15) is opened on the top of the support box (14). A slot (16) is opened inside the opening (9). 0), the slot (10) is movable and cooperates with the cable (8), the fixed slot (15) is fixed with a reset mechanism (31), one end of the reset mechanism (31) is fixed on the fixed block (16), the side of the support box (14) is movably installed with a pressing block (21), one side of the pressing block (21) is movable and in contact with the cable (8), one end of the pressing block (21) is fixed on the fixed block (16), the side of the support box (14) has a limit groove (17), the inside of the limit groove (17) is fixed with a tension mechanism (18), one end of the tension mechanism (18) is fixed with a limit block (19), the limit block (19) is fixed with a limit post (20), the inside of the opening (9) has an annular groove (22), the annular groove (22) is movably installed on one end of the limit post (20).

2. A two-channel N-type thermocouple transmitter with cold junction compensation according to claim 1, characterized in that: The support assembly (5) includes a support plate (23), one end of the support mechanism (4) is fixed on the support plate (23), a protrusion (27) is fixed on the side of the support plate (23), and a groove is opened inside the slide (3), and the protrusion (27) is movably installed inside the groove.

3. A two-channel N-type thermocouple transmitter with cold junction compensation according to claim 2, characterized in that: The support plate (23) has a support groove (24) on its side. An elastic mechanism (25) is fixed inside the support groove (24). A support block (26) is fixed at one end of the elastic mechanism (25). A movable plate (28) is fixed at one end of the support block (26).

4. A two-channel N-type thermocouple transmitter with cold junction compensation according to claim 3, characterized in that: A connecting block (30) is fixed to the top of the movable plate (28), and a limiting plate (29) is movably installed on the top of the movable plate (28). A connecting groove is opened on the limiting plate (29), and the connecting block (30) is movably installed inside the connecting groove.

5. A two-channel N-type thermocouple transmitter with cold junction compensation according to claim 1, characterized in that: The fixed base (1) has an opening (13), and a fixing screw (12) is rotatably installed inside the opening (13).

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