Multi-point thermocouple

Abstract

The application relates to the field of thermocouples, in particular to a multi-point thermocouple. The multi-point thermocouple comprises a protective tube, one end of the protective tube is provided with a sealing joint, the other end is closed, a thermocouple element is fixed in the protective tube, the thermocouple element is connected with a connecting lead, the connecting lead passes through the sealing joint and is exposed outside the protective tube, the thermocouple element is multiple, and the distance between the multiple thermocouple elements and the sealing structure is different. The multi-point thermocouple integrates multiple thermocouple monomers into one body, and multiple supports do not need to be separately arranged during installation, so that installation, disassembly and maintenance are more convenient.

Description

Technical Field

[0001] This invention relates to the field of thermocouples, specifically to a multi-point thermocouple. Background Technology

[0002] In petrochemical plants such as synthesis towers, reactors, storage tanks, and ammonia synthesis facilities, it is necessary to simultaneously measure the temperature at multiple points. Therefore, thermocouples need to be installed at different heights. The existing method involves installing multiple supports at different heights within the plant to facilitate the installation of the corresponding thermocouples. This method presents the following technical problems: 1. The presence of numerous supports makes the installation, disassembly, and maintenance of multiple thermocouples inconvenient; 2. The installation positions of multiple thermocouples are fixed, making them inconvenient to adjust. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides a multi-point thermocouple to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A multi-point thermocouple includes a protective tube, one end of which is provided with a sealing joint and the other end is closed. A thermocouple element is fixed inside the protective tube, and the thermocouple element is connected to a lead wire. The lead wire passes through the sealing joint and protrudes outside the protective tube. There are multiple thermocouple elements, and the distance between the multiple thermocouple elements and the sealing structure is different.

[0005] Preferably, a thermocouple element fixing frame is provided inside the protective tube. The thermocouple element fixing frame includes an annular fixing plate and a circular fixing plate. The circular fixing plate is located inside the annular fixing plate and connected to it, forming a first weak point at the connection position. Multiple first fixing tubes are circumferentially arranged on the bottom surface of the annular fixing plate. The bottom ends of the multiple first fixing tubes have different heights, and a first thermocouple element is fixed to the bottom end of each first fixing tube. Multiple support plates are circumferentially arranged on the other side of the annular fixing plate. Each support plate includes an inclined portion that slopes inward toward the annular fixing plate and a vertical portion perpendicular to the annular fixing plate. The bottom end of the inclined portion is integrally connected to the annular fixing plate, and the top end is integrally arranged with the vertical portion. A limiting ring is connected to the top end of each of the multiple support plates, and the inner surface of the limiting ring is provided with internal threads. A frustum-shaped support column is integrally arranged on the top surface of the circular fixing plate. The side of the support column is parallel to the inclined portion. A cylinder is connected to the top surface of the frustum-shaped support column, forming a second weak point at the connection position. The cylinder has an external thread that mates with the internal thread. The frustum-shaped support column and the circular fixing plate form a load-bearing body. The load-bearing body has a central hole. A central column is provided on the bottom surface of the cylinder. The bottom end of the central column extends out of the central hole and slides with the central hole. An operating part is provided at the bottom end of the central column. Multiple second fixing tubes are arranged circumferentially at the bottom end of the load-bearing body. The bottom ends of the multiple second fixing tubes have different heights. A second thermocouple element is fixed at the bottom end of each of the second fixing tubes. Multiple third fixing tubes are arranged circumferentially at the bottom end of the cylinder. The bottom ends of the multiple third fixing tubes have different heights. The third fixing tubes pass through the load-bearing body and slide with the load-bearing body. A second thermocouple element is fixed at the bottom end of each of the third fixing tubes.

[0006] Preferably, the protective tube includes an integrally formed first vertical section, an inclined section, and a second vertical section; the inclined section is arranged parallel to the inclined portion, the first vertical section is located below the inclined portion, the second vertical section is located above the inclined portion, and the inner diameter of the first vertical section is greater than or equal to the outer diameter of the annular fixing plate.

[0007] Preferably, the thermocouple element holder is a plastic holder.

[0008] Preferably, the top of the first fixing tube is provided with a first threading hole for the traction wire to pass through, the carrier and the cylinder form a movable member, and the movable member is provided with a plurality of second threading holes, a plurality of third threading holes and a plurality of fourth threading holes; the plurality of second threading holes are provided with a plurality of first fixing tubes; the plurality of third threading holes are provided with a plurality of second fixing tubes and are coaxially arranged with the corresponding second fixing tubes; the fourth threading hole is provided with a plurality of third fixing tubes and is coaxially arranged with the corresponding third fixing tubes.

[0009] Preferably, the operating part is an internal hexagonal hole.

[0010] Preferably, a limit block is provided at the bottom of the central column.

[0011] Preferably, the bottom circumferential of the circular fixing plate is provided with multiple slots.

[0012] The multi-point thermocouple provided by this invention integrates multiple thermocouple units into one, eliminating the need for separate supports during installation and making installation, disassembly, and maintenance more convenient. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of a multi-point thermocouple according to the present invention is shown; Figure 2 A schematic diagram of the bottom structure of the protective tube is shown; Figure 3 A schematic diagram of the bottom structure of a thermocouple element holder is shown; Figure 4 It shows Figure 3 Top view; Figure 5 It shows Figure 3 A bottom view; Figure 6 A schematic diagram of a carrier structure is shown; Marked in the attached diagram: 1. Lead wire; 2. Sealing connector; 3. Protective tube; 4. First vertical section 3-1; 5. Inclined section 3-2; 6. Second vertical section 3-3; 7. Thermocouple element; 8. Annular fixing plate; 9. Circular fixing plate; 10. First fixing tube; 11. Support plate; 2. Inclined part 8-1; 2. Vertical part 8-2; 12. Limiting ring; 13. Frustum-shaped support column; 14. Cylinder; 15. Central column; 16. Second fixing tube; 17. Third fixing tube; 18. Second wire hole; 19. Fourth wire hole; 10. Internal hexagonal hole; 11. Slot. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figure 1This application provides a multi-point thermocouple, including a protective tube 3, one end of which is provided with a sealing joint 2, and the other end is closed. A thermocouple element 4 is fixed inside the protective tube. The thermocouple element can use existing components such as platinum heads or platinum wires. The thermocouple element is connected to a lead wire 1, which passes through the sealing joint and protrudes outside the protective tube. There are multiple thermocouple elements, and the distance between the multiple thermocouple elements and the sealing structure is different.

[0016] The aforementioned multi-point thermocouple integrates multiple individual thermocouples into one unit, eliminating the need for separate supports during installation and making installation, disassembly, and maintenance more convenient.

[0017] In actual manufacturing, multiple thermocouple elements can be inserted into a protective tube, and then the leads are passed through a sealing joint. The sealing joint is then fixed to the protective tube and sealed, followed by sealing the other end of the protective tube. However, this method is prone to damage to individual thermocouples during the compression process, and the installation position is inconvenient to adjust. Therefore, see [reference needed]. Figures 2-6In this embodiment, the problem is solved by providing a thermocouple element fixing bracket inside the protective tube. The thermocouple element fixing bracket can be a plastic bracket, which includes an annular fixing plate 5 and a circular fixing plate 6. The circular fixing plate is located inside the annular fixing plate and connected to it, forming a first weak point at the connection position. Multiple first fixing tubes 7 are circumferentially arranged on the bottom surface of the annular fixing plate, with different heights at their bottom ends. A first thermocouple element is fixed to the bottom end of each first fixing tube. Multiple support plates 8 are circumferentially arranged on the other side of the annular fixing plate. Each support plate includes an inclined portion 8-1 that tilts inward toward the annular fixing plate and a vertical portion 8-2 perpendicular to the annular fixing plate. The bottom end of the part is integrally connected to the annular fixing plate, and the top end is integrally set with the vertical part. A limiting ring 9 is connected to the top end of the multiple supporting plates, and the inner surface of the limiting ring is provided with internal thread. A frustum-shaped support column 10 is integrally set on the top surface of the circular fixing plate. The side of the frustum-shaped support column is set parallel to the inclined part. A cylinder 11 is connected to the top surface of the frustum-shaped support column, and the connection position forms a second weak part. The cylinder is provided with external thread that mates with the internal thread. The frustum-shaped support column and the circular fixing plate form a bearing body. The bearing body is provided with a central hole. A central column 12 is provided on the bottom surface of the cylinder. The bottom end of the central column extends out of the central hole and is slidably set with the central hole. An operating part is provided at the bottom end of the central column. In this embodiment, the operating part is an internal hexagonal hole 18. Multiple second fixing tubes 13 are circumferentially arranged at the bottom end of the support body. The bottom ends of the multiple second fixing tubes have different heights, and a second thermocouple element is fixed at the bottom end of each second fixing tube. Multiple third fixing tubes 14 are circumferentially arranged at the bottom end of the cylinder. The bottom ends of the multiple third fixing tubes have different heights, and the third fixing tubes pass through the support body and slide against it. A second thermocouple element is fixed at the bottom end of each third fixing tube. The protective tube includes an integrally formed first vertical section 3-1, an inclined section 3-2, and a second vertical section 3-3. The inclined section is parallel to the inclined portion, and the first vertical section is located within the inclined portion. Below, the second vertical section is located above the inclined portion, and the inner diameter of the first vertical section is slightly greater than or equal to the outer diameter of the annular fixing plate; the top of the first fixing tube is provided with a first threading hole for the traction wire to pass through, the carrier and the cylinder form a movable part, and the movable part is provided with a plurality of second threading holes 15, a plurality of third threading holes 16 and a plurality of fourth threading holes 17; the plurality of second threading holes are provided corresponding to a plurality of first fixing tubes; the plurality of third threading holes are provided corresponding to a plurality of second fixing tubes and are coaxially arranged with the corresponding second fixing tubes, the fourth threading hole is provided corresponding to a plurality of third fixing tubes and is coaxially arranged with the corresponding third fixing tubes, and the bottom end of the circular fixing plate is provided with a plurality of slots 19.

[0018] The above structure can be used in the following ways: Method 1: Fix multiple thermocouple units to the corresponding fixing tubes, generally by snap-fit ​​or adhesive. Pass the corresponding leads through the corresponding wire holes, exposing them outside the limiting ring. Then, directly insert the thermocouple element holder into the protective tube. The force is applied to the annular fixing plate. Since the inclined section of the protective tube gradually tapers from bottom to top, the thermocouple element holder is stuck in the inclined section under the thrust. Of course, the connection between the thermocouple element holder and the protective tube can also be strengthened by adhesive. In this way, the heights of the multiple thermocouple elements are different, and the height differences between the first thermocouple element, the second thermocouple element, and the third thermocouple element are small. Method 2: If it is necessary to adjust the height of the second thermocouple element, based on Method 1, push the circular fixing plate forcefully. The first weak part is destroyed, and the circular fixing plate and the annular fixing plate are no longer connected. The movable part moves upward as a whole until the frustum-shaped support column abuts against the inclined part 8-1. When using plastic parts, the inclined section is squeezed and deformed and abuts against the inner surface of the inclined section, which increases the stability of the connection between the thermocouple element fixing frame and the protective tube. During manufacturing, the cylinder can contact the limiting ring during the upward movement of the movable part. The circular fixing plate can be rotated by using a wrench that matches multiple slots, so that the movable part rotates as a whole. The external thread and the internal thread are combined to connect the cylinder and the limiting ring. In this way, during the upward movement of the movable part, the frustum-shaped support column abuts against the inclined part, and the movable part is threadedly connected to the limiting ring, so that the position of the second thermocouple element is more firmly fixed. Method 3: If it is necessary to adjust the height of the second and third thermocouple elements, based on Method 1, first push the central column forcefully to break the second weak part, then push the circular fixing plate forcefully to break the first weak part. Continue to push the circular fixing plate until the cylinder contacts the limiting ring. Insert a hex wrench into the internal hexagonal hole and rotate the operating part to make the cylinder threadedly connected to the limiting ring. Adjust the height of the third thermocouple element by rotating the operating part a different number of times. When adjusting, pay attention to the looseness of the lead wire to prevent the traction wire from being tightened. After the position of the cylinder is adjusted, continue to push the circular fixing plate until the carrier is locked by the inclined part. Of course, if the cylinder can contact the limiting ring during the rising process of the moving part in Method 2, you can push the central column to break the second weak part and directly rotate the operating part based on Method 2.

[0019] Method 4: If only the height of the third thermocouple element needs to be adjusted, based on Method 1, push the center column forcefully to break the second weak part, continue to push the center column forcefully so that the cylinder contacts the limiting ring, insert a hex wrench into the internal hexagonal hole and rotate the operating part so that the cylinder is threadedly connected to the limiting ring, and adjust the height of the third thermocouple element by rotating the operating part a different number of times.

[0020] In actual manufacturing, the connection between the circular fixing plate and the annular fixing plate is generally stronger than the connection between the frustum-shaped support column and the cylinder. That is, the first weak part is stronger than the second weak part. In order to limit the height of the cylinder, a limit block can also be set at the bottom of the central column. The setting of the limit block is well known to those skilled in the art and will not be described in detail here.

[0021] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0022] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0023] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-point thermocouple, characterized in that, Includes a protective tube (3), one end of which is provided with a sealing joint (2) and the other end is closed. A thermocouple element (4) is fixed inside the protective tube. The thermocouple element is connected to a lead wire (1), which passes through the sealing joint and protrudes outside the protective tube. The thermocouple element is multiple, and the distance between the multiple thermocouple elements and the sealing joint is different; The protective tube is provided with a thermocouple element fixing frame, which includes an annular fixing plate (5) and a circular fixing plate (6). The circular fixing plate is located inside the annular fixing plate and is connected to the annular fixing plate. The connection position forms the first weak part. The bottom surface of the annular fixing plate is provided with a plurality of first fixing tubes (7) in a circumferential manner. The bottom ends of the plurality of first fixing tubes are at different heights. A first thermocouple element is fixed at the bottom end of the first fixing tube. The other side of the annular fixing plate is provided with a plurality of support plates (8). The support plate includes an inclined part (8-1) that is inclined toward the inside of the annular fixing plate and a vertical part (8-2) that is perpendicular to the annular fixing plate. The bottom end of the inclined part is integrated with the annular fixing plate, and the top end is integrated with the vertical part. A limiting ring (9) is connected to the top end of the plurality of support plates. The inner surface of the limiting ring is provided with an internal thread. The top surface of the circular fixing plate is integrally provided with a frustum-shaped support column (10). The side of the frustum-shaped support column is parallel to the inclined part. The top surface of the frustum-shaped support column is connected to a cylinder (11), and the connection position forms a second weak part. The cylinder is provided with an external thread that mates with the internal thread. The frustum-shaped support column and the circular fixing plate form a carrier. The carrier is provided with a central hole. The bottom surface of the cylinder is provided with a central column (12). The bottom end of the central column extends out of the central hole and slides with the central hole. The bottom end of the central column is provided with an operating part. The bottom end of the carrier is provided with a plurality of second fixing tubes (13) with different heights at the bottom ends. A second thermocouple element is fixed at the bottom end of the second fixing tube. The bottom end of the cylinder is provided with a plurality of third fixing tubes (14) with different heights at the bottom ends. The third fixing tubes pass through the carrier and slide with the carrier. A second thermocouple element is fixed at the bottom end of the third fixing tube.

2. A multi-point thermocouple according to claim 1, characterized in that, The protective tube includes an integrally formed first vertical section (3-1), an inclined section (3-2), and a second vertical section (3-3); the inclined section is arranged parallel to the inclined portion, the first vertical section is located below the inclined portion, the second vertical section is located above the inclined portion, and the inner diameter of the first vertical section is greater than or equal to the outer diameter of the annular fixing plate.

3. A multi-point thermocouple according to claim 1, characterized in that, The thermocouple element holder is a plastic frame.

4. A multi-point thermocouple according to any one of claims 1-3, characterized in that, The top of the first fixed tube is provided with a first threading hole for the traction wire to pass through. The carrier and the cylinder form a movable part. The movable part is provided with a plurality of second threading holes (15), a plurality of third threading holes (16) and a plurality of fourth threading holes (17). Multiple second threading holes are provided for multiple first fixing tubes; multiple third threading holes are provided for multiple second fixing tubes and are coaxially arranged with the corresponding second fixing tubes; the fourth threading hole is provided for multiple third fixing tubes and is coaxially arranged with the corresponding third fixing tubes.

5. A multi-point thermocouple according to any one of claims 1-3, characterized in that, The operating part is an internal hexagonal hole (18).

6. A multi-point thermocouple according to any one of claims 1-3, characterized in that, A limit block is provided at the bottom of the central column.

7. A multi-point thermocouple according to any one of claims 1-3, characterized in that, The bottom circumferential of the circular fixing plate is provided with multiple slots (19).

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