Thermocouple and thermocouple sensor having the same

Abstract

The present invention discloses a thermocouple and a thermocouple sensor having the same, wherein the thermocouple comprises: a first thermocouple wire, a second thermocouple wire, and a protective sleeve, wherein the first thermocouple wire is sheathed with a first insulating sleeve; the second thermocouple wire is sheathed with a second insulating sleeve, one end of the second thermocouple wire and one end of the first thermocouple wire are welded to form a thermocouple junction; the protective sleeve comprises a first straight section sleeve, a curved section sleeve, and a second straight section sleeve connected in sequence, the protective sleeve covering the first thermocouple wire and the second thermocouple wire, the first straight section sleeve being close to the thermocouple junction and the thermocouple junction being connected to the inner wall of the end of the first straight section sleeve, and the wall of the second straight section sleeve having a grounding lead. Thus, the use of the thermocouple can effectively reduce random errors in the temperature measurement process, and the temperature measurement accuracy error caused by random errors is less than 0.01%, thereby improving the accuracy of the collected data.

Description

Technical Field

[0001] The invention belongs to the field of temperature measurement, and in particular relates to a thermocouple and a thermocouple sensor having the same. Background Art

[0002] Temperature is a crucial parameter in industrial production and scientific experiments. Many physical phenomena and chemical properties are temperature-dependent, and many production processes can only be performed within a specific temperature range. Therefore, accurate temperature information is essential in modern life. With the continuous advancement of technology and the increasing application of temperature sensors, people are placing increasingly higher demands on their physical structure and measurement accuracy.

[0003] Reducing measurement errors is the only way to improve the temperature measurement accuracy of thermocouple sensors. While reducing systematic errors, reducing random errors is also very important for improving temperature measurement accuracy. The most effective way to eliminate this random error is to collect data multiple times and take the average value to approximate the actual data.

[0004] However, since there is little research on the elimination of random errors, the elimination of random errors in thermocouples needs to be explored urgently. Summary of the Invention

[0005] The present invention aims to solve, at least to a certain extent, one of the technical problems in the related art. To this end, one object of the present invention is to provide a thermocouple and a thermocouple sensor having the same, which can effectively reduce random errors in the temperature measurement process, and the temperature measurement accuracy error caused by random errors is less than 0.01%, thereby improving the accuracy of the collected data.

[0006] In one aspect of the present invention, the present invention provides a thermocouple. According to an embodiment of the present invention, the thermocouple comprises:

[0007] a first thermocouple wire, wherein a first insulating sleeve is provided on the first thermocouple wire;

[0008] a second thermocouple wire, wherein a second insulating sleeve is sleeved on the second thermocouple wire, and one end of the second thermocouple wire and one end of the first thermocouple wire are welded to form a thermocouple junction;

[0009] A protective sleeve, comprising a first straight-segment sleeve, a curved-segment sleeve, and a second straight-segment sleeve connected in sequence, wherein the protective sleeve covers the first thermocouple wire and the second thermocouple wire, and the first straight-segment sleeve is close to the thermocouple wire node and the thermocouple wire node is connected to the inner wall of the end of the first straight-segment sleeve, and the pipe wall of the second straight-segment sleeve has a grounding lead.

[0010] According to the thermocouple of the embodiment of the present invention, a first insulating sleeve is sleeved on the first thermocouple wire, a second insulating sleeve is sleeved on the second thermocouple wire, and one end of the second thermocouple wire and one end of the first thermocouple wire are welded to form a wire junction, and then a protective sleeve is covered on the first thermocouple wire and the second thermocouple wire, and the protective sleeve includes a first straight segment sleeve, a curved segment sleeve and a second straight segment sleeve connected in sequence, and the disturbance of the curved segment sleeve can drive the movement of the first straight segment sleeve part of the front end of the thermocouple, that is, the front end of the thermocouple of this structure is an unstable and easy-to-shake structure, so that by applying a small disturbance or temperature measurement at the end of the thermocouple The disturbance inside the environment can cause the front end of the thermocouple to generate a random displacement, thereby realizing multi-point random collection of multiple data. The multi-point collected data is averaged to reduce random errors and ensure the accuracy of the randomly collected data. At the same time, the wire junction is connected to the inner wall of the first straight segment casing end, that is, the thermocouple of this structure is a shell-connected structure, thereby significantly improving the response speed of the wire junction and improving the accuracy of the collected data. In addition, a grounding lead is arranged on the pipe wall of the second straight segment casing, so that the thermocouple can effectively shield external electromagnetic interference, so that this curved segment disturbance structure does not generate induced current, further ensuring the accuracy of the collected data. Therefore, the thermocouple using the structure of the present application can effectively reduce the random error of the temperature measurement process, and the temperature measurement accuracy error caused by the random error is less than 0.01%, thereby improving the accuracy of the collected data.

[0011] In addition, the thermocouple according to the above embodiment of the present invention may also have the following additional technical features:

[0012] In some embodiments of the present invention, the thickness of the thermocouple junction is the same as the diameter of the first thermocouple wire or the second thermocouple wire. Thus, the specific surface area of ​​the thermocouple junction can be maximized without damaging the thermocouple wires, thereby improving the accuracy of the collected data.

[0013] In some embodiments of the present invention, a predetermined distance exists between the even-wire node and the first and / or second insulating sleeves. This can improve the thermal response speed of the even-wire node, prevent the first and / or second insulating sleeves from affecting the movement of the even-wire node, and improve the random movement flexibility of the even-wire node.

[0014] In some embodiments of the present invention, the predetermined distance is no greater than 1 / 4 of the length of the first straight segment sleeve, thereby ensuring the flexibility of the movement of the even-wire node.

[0015] In some embodiments of the present invention, the length ratio of the first straight segment casing to the curved segment casing and the second straight segment casing is 1:(1-2):(1-3). Thus, the temperature measurement data can be significantly improved.

[0016] In some embodiments of the present invention, the curved sleeve is a spring-shaped sleeve that extends along the length of the first thermocouple wire and / or the second thermocouple wire, thereby facilitating the operation of the front end of the thermocouple.

[0017] In some embodiments of the present invention, the ratio of the thread diameter of the spring-shaped sleeve to the diameter of the first straight segment sleeve or the second straight segment sleeve is (3-5):1.

[0018] In some embodiments of the present invention, the ratio of the pitch of the spring-shaped sleeve to the length of the spring-shaped sleeve is 1:(1.5-10).

[0019] In some embodiments of the present invention, the protective sleeve is a metal sleeve.

[0020] In yet another aspect, the present invention provides a thermocouple sensor. According to an embodiment of the present invention, the thermocouple sensor includes the aforementioned thermocouple. Thus, the thermocouple sensor utilizes the aforementioned thermocouple for accurate temperature measurement, thereby achieving high temperature measurement accuracy.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 FIG. 4 is a schematic structural diagram of a thermocouple according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] In one aspect of the present invention, the present invention provides a thermocouple. According to an embodiment of the present invention, reference is made to Figure 1 The thermocouple includes: a first thermocouple wire 100, a second thermocouple wire 200 and a protective sleeve 300.

[0030] According to an embodiment of the present invention, referring to Figure 1, the first thermocouple wire 100 is sleeved with a first insulating sleeve 11, the second thermocouple wire 200 is sleeved with a second insulating sleeve 21, one end of the second thermocouple wire 200 and one end of the first thermocouple wire 100 are welded to form a wire junction 10, that is, the first thermocouple wire 100 and the second thermocouple wire 200 are respectively the positive and negative poles of the thermocouple. Preferably, the thickness of the wire junction 10 is the same as the diameter of the first thermocouple wire 100 or the second thermocouple wire 200. Thus, the specific surface area of ​​the wire junction can be maximized without damaging the thermocouple wires, thereby improving the accuracy of the collected data. It should be noted that the present application does not specifically limit the specific material of the first thermocouple wire 100, the second thermocouple wire 200, the first insulating sleeve 11 and the second insulating sleeve 21. Those skilled in the art can make a selection according to actual needs, as long as their functions can be achieved, and will not be repeated here.

[0031] For further reference, Figure 1 The first thermocouple wire 100 and the second thermocouple wire 200 are arranged in parallel. No insulating sleeve is provided on the ends of the first and second thermocouple wires 100 and 200 near the thermocouple wire junction 10. That is, a predetermined distance L1 exists between the thermocouple wire junction 10 and the first insulating sleeve 11 and / or the second insulating sleeve 21. The inventors have discovered that by reserving the predetermined distance L1 between the thermocouple wire junction 10 and the first insulating sleeve 11 and / or the second insulating sleeve 21, the thermal response speed of the thermocouple wire junction can be improved, the influence of the first insulating sleeve and / or the second insulating sleeve on the movement of the thermocouple wire junction can be prevented, and the random movement flexibility of the thermocouple wire junction can be improved.

[0032] According to an embodiment of the present invention, the protective sleeve 300 is a metal sleeve. Figure 1 The protective sleeve 300 includes a first straight-segment sleeve 31, a curved-segment sleeve 32, and a second straight-segment sleeve 33, which are connected in sequence. The protective sleeve 300 covers the first thermocouple wire 100 and the second thermocouple wire 200. That is, the first thermocouple wire 100 and the second thermocouple wire 200 pass through the first straight-segment sleeve 31, the curved-segment sleeve 32, and the second straight-segment sleeve 33 in sequence. The inventors discovered that the disturbance of the curved-segment sleeve 32 can drive the movement of the first straight-segment sleeve 31 at the front end of the thermocouple. That is, the front end of the thermocouple in this structure is an unstable and easily wobbling structure. Therefore, by applying a small disturbance to the end of the thermocouple or a disturbance within the temperature measurement environment, the front end of the thermocouple can be caused to undergo a random displacement, thereby achieving multi-point random acquisition of multiple data points. By averaging the multi-point acquired data, random errors can be reduced and the accuracy of the randomly acquired data can be ensured.

[0033] Preferably, the predetermined distance L1 is no greater than ¼ of the length L2 of the first straight segment sleeve 100. The inventors have discovered that if the predetermined distance L1 is too large, the first thermocouple wire 100 and the second thermocouple wire 200 are likely to come into contact, thereby interfering with the normal transmission of the thermoelectric potential signal and reducing temperature measurement accuracy. Therefore, employing this predetermined distance can improve temperature measurement accuracy.

[0034] For further reference, Figure 1 The ratio of the length L2 of the first straight segment sleeve 31 to the length L3 of the curved segment sleeve 32 and the length L4 of the second straight segment sleeve 33 is 1:(1-2):(1-3). For example, the ratio of the length L2 of the first straight segment sleeve 31 to the length L3 of the curved segment sleeve 32 and the length L4 of the second straight segment sleeve 33 is 1:(1, 1.1...1.9, 2):(1, 1.1...2.9, 3). The inventors have discovered that if the ratio of the length L2 of the first straight segment sleeve 31 is too small, the ability to eliminate random errors is insufficient, while if the ratio of the length L2 of the first straight segment sleeve 31 is too large, additional systematic errors will be caused. At the same time, if the ratio of the length L3 of the curved segment sleeve 32 is too small, the overall mechanical reliability of the thermocouple will be limited. If the ratio of the length L3 of the curved segment sleeve 32 is too large, the application scenarios of the thermocouple will be limited. Therefore, a thermocouple using this structure can ensure the mechanical reliability of the thermocouple while improving the temperature measurement accuracy. It should be explained that the "curved section sleeve length" described herein should be understood as the straight-line distance between the front and rear ends of the curved section sleeve 32. Preferably, the curved section sleeve 32 is a spring-shaped sleeve, and the spring-shaped sleeve extends along the length of the first thermocouple wire 100 and / or the second thermocouple wire 200. According to a specific embodiment of the present invention, the ratio of the thread diameter R1 of the spring-shaped sleeve to the diameter R2 of the first straight section sleeve 31 or the diameter R3 of the second straight section sleeve 32 is (3-5):1, for example (3, 3.1...4.9, 5):1. The inventors have found that this ratio can significantly optimize the mechanical reliability of the thermocouple as a whole and reduce the introduction of system errors better than other ratios. According to another specific embodiment of the present invention, the ratio of the thread pitch D of the spring-shaped sleeve to the length L3 of the spring-shaped sleeve is 1:(1.5-10), for example 1:(1.5, 1.6...9.9, 10). The inventors found that this ratio can significantly outperform other ratios in optimizing the ability to eliminate random errors, thereby improving temperature measurement accuracy.

[0035] For further reference, Figure 1 The first straight segment sleeve 31 is close to the even wire node 10 and the even wire node 10 is connected to the inner wall of the end of the first straight segment sleeve 31, that is, the thermocouple of this structure is a shell-connected structure, which can significantly improve the response speed of the even wire node and improve the accuracy of the collected data.

[0036] For further reference, Figure 1The wall of the second straight section sleeve 33 has a grounding lead 331, that is, during use, the grounding lead 311 is connected to the ground, so that the thermocouple can effectively shield external electromagnetic interference, so that this curved section disturbance structure will not generate induced current, further ensuring the accuracy of the collected data.

[0037] According to the thermocouple of the embodiment of the present invention, a first insulating sleeve is sleeved on the first thermocouple wire, a second insulating sleeve is sleeved on the second thermocouple wire, and one end of the second thermocouple wire and one end of the first thermocouple wire are welded to form a wire junction, and then a protective sleeve is covered on the first thermocouple wire and the second thermocouple wire, and the protective sleeve includes a first straight segment sleeve, a curved segment sleeve and a second straight segment sleeve connected in sequence, and the disturbance of the curved segment sleeve can drive the movement of the first straight segment sleeve part of the front end of the thermocouple, that is, the front end of the thermocouple of this structure is an unstable and easy-to-shake structure, so that by applying a small disturbance or temperature measurement at the end of the thermocouple The disturbance inside the environment can cause the front end of the thermocouple to generate a random displacement, thereby realizing multi-point random collection of multiple data. The multi-point collected data is averaged to reduce random errors and ensure the accuracy of the randomly collected data. At the same time, the wire junction is connected to the inner wall of the first straight segment casing end, that is, the thermocouple of this structure is a shell-connected structure, thereby significantly improving the response speed of the wire junction and improving the accuracy of the collected data. In addition, a grounding lead is arranged on the pipe wall of the second straight segment casing, so that the thermocouple can effectively shield external electromagnetic interference, so that this curved segment disturbance structure does not generate induced current, further ensuring the accuracy of the collected data. Therefore, the thermocouple using the structure of the present application can effectively reduce the random error of the temperature measurement process, and the temperature measurement accuracy error caused by the random error is less than 0.01%, thereby improving the accuracy of the collected data.

[0038] In yet another aspect, the present invention provides a thermocouple sensor. According to an embodiment of the present invention, the thermocouple sensor includes the aforementioned thermocouple. Thus, the thermocouple sensor utilizes the aforementioned thermocouple for accurate temperature measurement, thereby achieving high temperature measurement accuracy.

[0039] It should be noted that the features and advantages described above for the thermocouple are also applicable to the thermocouple sensor and will not be described in detail here.

[0040] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0041] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A thermocouple, characterized in that include: a first thermocouple wire, wherein a first insulating sleeve is provided on the first thermocouple wire; a second thermocouple wire, wherein a second insulating sleeve is sleeved on the second thermocouple wire, and one end of the second thermocouple wire and one end of the first thermocouple wire are welded to form a thermocouple junction; A protective sleeve, comprising a first straight-segment sleeve, a curved-segment sleeve, and a second straight-segment sleeve connected in sequence, the protective sleeve covering the first thermocouple wire and the second thermocouple wire, wherein the first straight-segment sleeve is close to the thermocouple wire node and the thermocouple wire node is connected to the inner wall of the end of the first straight-segment sleeve, and the wall of the second straight-segment sleeve has a grounding lead; the disturbance of the curved-segment sleeve drives the movement of the first straight-segment sleeve portion; The thickness of the thermocouple wire junction is the same as the diameter of the first thermocouple wire or the second thermocouple wire; The curved section sleeve is a spring-shaped sleeve, and the spring-shaped sleeve extends along the length direction of the first thermocouple wire and / or the second thermocouple wire.

2. The thermocouple according to claim 1, characterized in that There is a predetermined distance between the even-wire node and the first insulating sleeve and / or the second insulating sleeve.

3. The thermocouple according to claim 2, characterized in that The predetermined distance is no greater than 1 / 4 of the length of the first straight segment sleeve.

4. The thermocouple according to claim 1, characterized in that The length ratio of the first straight segment sleeve to the curved segment sleeve and the second straight segment sleeve is 1:(1-2):(1-3).

5. The thermocouple according to claim 1, characterized in that The ratio of the spiral diameter of the spring-shaped sleeve to the diameter of the first straight segment sleeve or the second straight segment sleeve is (3-5):

1.

6. The thermocouple according to claim 1, characterized in that The ratio of the pitch of the spring-shaped sleeve to the length of the spring-shaped sleeve is 1:(1.5-10).

7. The thermocouple according to claim 1, characterized in that The protective sleeve is a metal sleeve.

8. A thermocouple sensor, characterized in that: The thermocouple sensor includes the thermocouple according to any one of claims 1 to 7.

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