CN216050338U - High-temperature thermocouple and manufacturing device thereof - Google Patents
High-temperature thermocouple and manufacturing device thereof Download PDFInfo
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- CN216050338U CN216050338U CN202120807241.2U CN202120807241U CN216050338U CN 216050338 U CN216050338 U CN 216050338U CN 202120807241 U CN202120807241 U CN 202120807241U CN 216050338 U CN216050338 U CN 216050338U
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Abstract
The utility model discloses a high-temperature thermocouple and a manufacturing device thereof, wherein the high-temperature thermocouple is formed by sintering boron nitride powder and thermocouple wires, and has the advantages of high temperature resistance, no deformation, good thermal shock resistance, no conductivity and the like; according to the manufacturing device, the outer sleeve, the inner liner and the lower pressing plate are arranged to be assembled into the mold, half of boron nitride powder is poured into the mold, the thermocouple wire penetrates through the through hole, the other half of the boron nitride powder is filled into the through hole, the upper pressing plate is pressed and then loaded into the furnace for sintering, and the high-temperature thermocouple can be obtained after the boron nitride powder is burnt out of the furnace and subjected to mold removal.
Description
Technical Field
The utility model relates to the technical field of temperature measuring elements, in particular to a high-temperature thermocouple and a manufacturing device thereof.
Background
At present, infrared temperature measurement or thermocouples are used at a lot of high temperatures, but the infrared temperature measurement cannot wrap a workpiece, and an enough position is reserved for focusing infrared rays, so that the temperature of the workpiece can be radiated to equipment, energy consumption is also consumed, in addition, the infrared temperature measurement distance and the glass of the middle partition block also generate different temperature differences, and the accuracy of temperature measurement is caused.
The thermocouple mainly adopts W526 with W-Re wire as the thermocouple wire, the thermocouple wire can be used at 0-2300 ℃ in common and can reach 0-2500 ℃ in short time, but the temperature can not be measured directly by the thermocouple wire, mainly because the bare W-Re thermocouple wire is easy to oxidize and is suitable for being used in inert or dry hydrogen, or the bare W-Re thermocouple wire can be used only by isolating the bare W-Re thermocouple wire from oxygen by a compact protection tube, therefore, a protective sleeve is required to be sleeved for protection in practical application, and a corundum tube is generally used as the protective sleeve. The corundum (99 corundum) which is the best temperature resistant at present is only barely as high as 1600 ℃. Therefore, the temperature resistance of the protective sleeve has great influence on the measurement range of the tungsten-rhenium wire thermocouple, and the protective sleeve for the thermocouple is very important to solve.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high-temperature thermocouple and a manufacturing device thereof, which aim to solve the problems in the background technology. In order to achieve the purpose, the utility model provides the following technical scheme: a high-temperature thermocouple comprises a thermocouple wire and a protective sleeve; the thermocouple wire consists of a positive thermocouple wire and a negative thermocouple wire, and one end of the positive thermocouple wire is connected with one end of the negative thermocouple wire to form a measuring end; the protective sleeve is formed by sintering boron nitride powder and wraps the thermocouple wire.
Preferably, one end of the outer side of the protective sleeve, which is used for measurement, is provided with a semicircular plug.
Preferably, the positive wire comprises a positive transverse section and a positive bending section, and the negative wire comprises a negative transverse section and a negative bending section; the distance between the positive electrode transverse section and the negative electrode transverse section is 3-5 mm; one end of the positive electrode bending section is connected with one end of the negative electrode bending section.
Preferably, the thermocouple wire is a tungsten-rhenium wire, the mass fraction of tungsten in the positive electrode thermocouple wire is 95%, the mass fraction of rhenium is 5%, the mass fraction of tungsten in the negative electrode thermocouple wire is 74%, and the mass fraction of rhenium is 26%.
A device for manufacturing a high-temperature thermocouple comprises an outer sleeve, an inner lining plate, an upper pressure plate and a lower pressure plate; the outer sleeve is provided with a groove with a square cross section, and an opening of the groove faces upwards; the inner lining plate is arranged in the groove and comprises a first long plate, a second long plate, a first short plate and a second short plate; the first long plate, the second long plate, the first short plate and the second short plate are spliced to form a square groove; the lower pressing plate is arranged at the bottom of the square groove; the upper pressing plate is positioned above the lower pressing plate when being installed and is arranged opposite to the lower pressing plate; and the second short plate is provided with a pair of through holes.
Preferably, the outer sleeve, the inner lining plate, the upper pressure plate and the lower pressure plate are all made of graphite.
Preferably, the aperture of the through holes is 0.8-1 mm, and the pitch between the two through holes is 3-5 mm.
Preferably, the thickness of the side wall of the outer sleeve is 10-15 mm, and the thickness of the lining plate is 5-8 mm.
Preferably, the inner side of the lining plate is provided with carbon paper.
Preferably, the side surfaces of the first short plate and the second short plate are provided with two convex strips which are parallel to each other, and two ends of the first long plate and the second long plate are respectively provided with a vertical groove matched with the convex strips.
Compared with the prior art, the utility model has the beneficial effects that: according to the high-temperature thermocouple, the boron nitride powder and the thermocouple wire are sintered together, so that the high-temperature thermocouple has the advantages of high temperature resistance, no deformation, good thermal shock resistance, no conductivity and the like; the manufacturing device for heating the high-temperature thermocouple in the utility model abandons the previous complicated installation and size limitation, is more flexible in processing, is assembled into a die by arranging the outer sleeve, the inner lining and the lower pressing plate, pours half of boron nitride powder into the die, penetrates the thermocouple wire into the through hole, fills the other half of powder, is pressed by the upper pressing plate and then is loaded into a furnace for sintering, and the high-temperature thermocouple can be obtained after the thermocouple is burnt out of the furnace and is demoulded.
Drawings
FIG. 1 is a schematic structural diagram of a high temperature thermocouple according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a manufacturing apparatus according to an embodiment of the present invention;
in fig. 1 and 2, the corresponding relationship between the names of the components and the reference numbers is as follows:
1-thermocouple wire, 11-positive thermocouple wire, 111-positive transverse section, 112-positive bending section, 12-negative thermocouple wire, 121-negative transverse section, 122-negative bending section, 2-protective sleeve, 21-boron nitride powder, 22-semicircular plug, 3-outer sleeve, 4-inner lining plate, 41-first long plate, 42-second long plate, 43-first short plate, 44-second short plate and 441-through hole.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the present invention provides a high temperature thermocouple, which includes a thermocouple wire 1 and a protective sheath 2; the thermocouple wire 1 consists of an anode thermocouple wire 11 and a cathode thermocouple wire 12, wherein one end of the anode thermocouple wire 11 is connected with one end of the cathode thermocouple wire 12 to form a measuring end; the protective sleeve 2 is formed by sintering boron nitride powder 21 and wraps the thermocouple wire 1.
In the embodiment of the present invention, as shown in fig. 1, the end point where the positive thermocouple wire 11 and the negative thermocouple wire 12 are connected is a measuring end, the protective sleeve 2 is used for wrapping the measuring end of the thermocouple wire 1 and most of the main body, the measuring end is used for detecting temperature, and then the other ends of the positive thermocouple wire 11 and the negative thermocouple wire 12 are respectively connected to a temperature control device. In this embodiment, the protective sleeve 2 is made of boron nitride powder 21, and the sintered and molded boron nitride protective sleeve 2 has the advantages of good temperature resistance and non-conductivity. The measuring ends of the anode wire pair 11 and the cathode wire pair 12 are connected, and the rest positions are kept in an insulation state, and because the anode wire pair 11 and the cathode wire pair 12 are made of different materials, an electric signal can be generated after the measuring ends are heated, and at the moment, the temperature control equipment can detect the temperature of the heated position.
Preferably, a semicircular plug 22 is arranged at one end of the outer side of the protective sleeve 2 for measurement.
Preferably, the positive couple wire 11 includes a positive transverse section 111 and a positive bending section 112, and the negative couple wire 12 includes a negative transverse section 121 and a negative bending section 122; the distance between the positive electrode transverse section 111 and the negative electrode transverse section 121 is 3-5 mm; one end of the positive electrode bent segment 112 is connected to one end of the negative electrode bent segment 122.
Preferably, the thermocouple wire 1 is a tungsten-rhenium wire, the mass fraction of tungsten in the positive electrode thermocouple wire 11 is 95%, the mass fraction of rhenium is 5%, the mass fraction of tungsten in the negative electrode thermocouple wire 12 is 74%, and the mass fraction of rhenium is 26%. The embodiment adopts the tungsten-rhenium thermocouple, and the tungsten-rhenium thermocouple has the advantages of wide temperature measuring range, large thermoelectricity value, high sensitivity, good linearity of the corresponding relation between the temperature and the thermoelectrical potential, high temperature measuring reaction speed and good thermal stability.
A device for manufacturing a high-temperature thermocouple comprises an outer sleeve 3, an inner lining plate 4, an upper pressure plate and a lower pressure plate; the outer sleeve 3 is provided with a groove with a square cross section, and the opening of the groove faces upwards; the inner lining plate 4 is arranged in the groove and comprises a first long plate 41, a second long plate 42, a first short plate 43 and a second short plate 44; the first long plate 41, the second long plate 42, the first short plate 43 and the second short plate 44 are spliced to form a square groove; the lower pressing plate is arranged at the bottom of the square groove; the upper pressing plate is positioned above the lower pressing plate when being installed and is arranged opposite to the lower pressing plate; the second short plate 44 is provided with a pair of through holes 441.
In the present embodiment, as shown in fig. 2, the outer cover 3 is machined to have a configuration of being inward and outward according to a desired dimension, and the height is set according to the height of an actual workpiece; the lining plate 4 is of a detachable and assembled structure and is formed by assembling a first long plate 41, a second long plate 42, a first short plate 43 and a second short plate 44, wherein the second short plate 44 is provided with two holes, and the height is processed according to the height of an actual workpiece; the size of the upper pressing plate (not shown in the figure) and the lower pressing plate (not shown in the figure) depends on the actual workpiece and mould requirements, wherein the lower pressing plate is placed in the square groove and is used for supporting the boron nitride powder 21, and the upper pressing plate is used for compacting the filled powder downwards and plays the role of a cover plate; boron nitride powder 21, used during the process, weighs the actual workpiece weight multiplied by a factor of 1.02 and is divided into halves for use.
The working process of the embodiment is as follows: firstly, placing an inner lining plate 4 into a groove of an outer sleeve 3, and placing a lower pressing plate into a square groove of the inner lining plate 4; then, the size of the thermocouple protective sleeve 2 is determined, the required dosage of the boron nitride powder 21 is calculated, and half of the powder is filled into the square groove; then the positive electrode couple wire 11 and the negative electrode couple wire 12 are respectively inserted into the two through holes 441, the positive electrode couple wire 11 and the negative electrode couple wire 12 are ensured to be in a separated state in the inserting process, and then the end parts of the positive electrode couple wire 11 and the negative electrode couple wire 12 are connected; and finally, filling the other half of the powder, flattening and sealing by using an upper pressing plate, thus loading into a furnace for sintering, and taking out of the furnace after burning for mold removal processing.
Preferably, the outer sleeve 3, the inner lining plate 4, the upper pressure plate and the lower pressure plate are all made of graphite. The mold made of graphite has the advantages of small porosity, compact structure, high surface smoothness, strong oxidation resistance and the like, so the outer sleeve 3, the inner lining plate 4, the upper pressure plate and the lower pressure plate in the embodiment are all made of graphite.
Preferably, the aperture of each through hole 441 is 0.8-1 mm, and the pitch between two through holes 441 is 3-5 mm.
Preferably, the thickness of the side wall of the outer sleeve 3 is 10-15 mm, and the thickness of the inner lining plate 4 is 5-8 mm.
Preferably, the inner side of the lining plate 4 is provided with carbon paper, and in the installation process of the lining plate 4, the carbon paper is attached to the inner side of the lining plate 4, and the mold is convenient to disassemble after sintering.
Preferably, two convex strips parallel to each other are disposed on the side surfaces of the first short plate 43 and the second short plate 44, and vertical grooves matched with the convex strips are disposed at two ends of the first long plate 41 and the second long plate 42, respectively. Through setting up sand grip and vertical groove, when assembling interior welt 4, can form a stable structure to inserting between adjacent sand grip and the vertical groove for boron nitride powder 21 fills and the process of compaction is more stable, and interior welt 4 is difficult for rocking in operation process.
Compared with the prior art, the utility model has the beneficial effects that: according to the high-temperature thermocouple, the boron nitride powder and the thermocouple wire are sintered together, so that the high-temperature thermocouple has the advantages of high temperature resistance, no deformation, good thermal shock resistance, no conductivity and the like; the manufacturing device for heating the high-temperature thermocouple in the utility model abandons the previous complicated installation and size limitation, is more flexible in processing, is assembled into a die by arranging the outer sleeve, the inner lining and the lower pressing plate, pours half of boron nitride powder into the die, penetrates the thermocouple wire into the through hole, fills the other half of powder, is pressed by the upper pressing plate and then is loaded into a furnace for sintering, and the high-temperature thermocouple can be obtained after the thermocouple is burnt out of the furnace and is demoulded.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the utility model in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the utility model and the practical application, and to enable others of ordinary skill in the art to understand the utility model for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A high-temperature thermocouple is characterized by comprising a thermocouple wire (1) and a protective sleeve (2); the thermocouple wire consists of an anode thermocouple wire (11) and a cathode thermocouple wire (12), wherein one end of the anode thermocouple wire is connected with one end of the cathode thermocouple wire to form a measuring end; the protective sleeve is formed by sintering boron nitride powder (21) and wraps the thermocouple wire.
2. A high-temperature thermocouple according to claim 1, characterised in that the end of the outer side of the protective sheath for measurement is provided with a semicircular plug (22).
3. The high-temperature thermocouple according to claim 1, wherein the positive thermocouple wire comprises a positive transverse section (111) and a positive bending section (112), and the negative thermocouple wire comprises a negative transverse section (121) and a negative bending section (122); the distance between the positive electrode transverse section and the negative electrode transverse section is 3-5 mm; one end of the positive electrode bending section is connected with one end of the negative electrode bending section.
4. A high temperature thermocouple according to claim 1, wherein the thermocouple wire is a tungsten-rhenium wire, the mass fraction of tungsten in the positive thermocouple wire is 95%, the mass fraction of rhenium is 5%, the mass fraction of tungsten in the negative thermocouple wire is 74%, and the mass fraction of rhenium is 26%.
5. A manufacturing device for manufacturing a high-temperature thermocouple according to any one of claims 1 to 4, comprising an outer sleeve (3), an inner lining plate (4), an upper pressure plate and a lower pressure plate; the outer sleeve is provided with a groove with a square cross section, and an opening of the groove faces upwards; the inner lining plate is arranged in the groove and comprises a first long plate (41), a second long plate (42), a first short plate (43) and a second short plate (44); the first long plate, the second long plate, the first short plate and the second short plate are spliced to form a square groove; the lower pressing plate is arranged at the bottom of the square groove; the upper pressing plate is positioned above the lower pressing plate when being installed and is arranged opposite to the lower pressing plate; and a pair of through holes (441) are formed in the second short plate.
6. The apparatus of claim 5, wherein the outer sheath, the inner lining plate, the upper platen and the lower platen are made of graphite.
7. A manufacturing device of a high-temperature thermocouple according to claim 6, wherein the aperture of the through holes is 0.8-1 mm, and the pitch between two through holes is 3-5 mm.
8. A manufacturing device of a high-temperature thermocouple according to claim 7, wherein the thickness of the side wall of the outer sleeve is 10-15 mm, and the thickness of the lining plate is 5-8 mm.
9. A device for manufacturing a high-temperature thermocouple according to claim 5, wherein the inner side of the inner lining plate is provided with carbon paper.
10. The apparatus of claim 5, wherein the first short plate and the second short plate have two parallel ribs on their sides, and the first long plate and the second long plate have vertical slots at their two ends for matching with the ribs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120807241.2U CN216050338U (en) | 2021-04-19 | 2021-04-19 | High-temperature thermocouple and manufacturing device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120807241.2U CN216050338U (en) | 2021-04-19 | 2021-04-19 | High-temperature thermocouple and manufacturing device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN216050338U true CN216050338U (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120807241.2U Active CN216050338U (en) | 2021-04-19 | 2021-04-19 | High-temperature thermocouple and manufacturing device thereof |
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- 2021-04-19 CN CN202120807241.2U patent/CN216050338U/en active Active
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