CN219996379U - Armoured thermocouple using glass encapsulation cold end - Google Patents
Armoured thermocouple using glass encapsulation cold end Download PDFInfo
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- CN219996379U CN219996379U CN202321344323.3U CN202321344323U CN219996379U CN 219996379 U CN219996379 U CN 219996379U CN 202321344323 U CN202321344323 U CN 202321344323U CN 219996379 U CN219996379 U CN 219996379U
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- sleeve
- glass
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- employing
- cold end
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- 239000011521 glass Substances 0.000 title claims abstract description 50
- 238000005538 encapsulation Methods 0.000 title description 5
- 239000012212 insulator Substances 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 230000008878 coupling Effects 0.000 claims abstract description 29
- 238000010168 coupling process Methods 0.000 claims abstract description 29
- 238000005859 coupling reaction Methods 0.000 claims abstract description 29
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 239000003292 glue Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 description 13
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 9
- 239000000395 magnesium oxide Substances 0.000 description 8
- 230000002742 anti-folding effect Effects 0.000 description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model provides an armored thermocouple using a glass packaged cold end. The sheathed thermocouple comprises: the device comprises a first sleeve and a coupling wire, wherein one end of the first sleeve is closed, and the other end of the first sleeve is provided with a first sleeve opening; the second sleeve is sleeved on the outer side of the first sleeve, one end of the second sleeve is connected with the outer peripheral wall of the first sleeve in a sealing manner, and the other end of the second sleeve is provided with a second sleeve opening; the third sleeve is in threaded connection with the second sleeve; the glass insulator is arranged at the opening of the first sleeve and seals the opening of the first sleeve; and a sealing body disposed in the third sleeve.
Description
Technical Field
The utility model relates to the technical field of thermocouples, in particular to an armored thermocouple applying a glass to encapsulate a cold end.
Background
The armoured thermocouple is one of the most commonly used temperature measuring sensors in a reactor, and has the advantages of firmness, durability, flexibility, excellent performance and the like. Magnesium oxide as an insulating material in the sheathed thermocouple has extremely strong moisture absorption characteristics, and if the cold end of the thermocouple is poorly packaged, the magnesium oxide can absorb moisture. The insulation resistance of the thermocouple is greatly reduced after the magnesium oxide absorbs moisture, and the measurement accuracy is affected, so that the quality of cold end encapsulation is one of the key factors affecting the performance of the armored thermocouple.
Chinese patent publication No. CN203274943U discloses a nuclear field armoured thermocouple, in which insulating powder is packed in a metal tube, nickel-chromium/nickel-aluminum wire is placed in the insulating powder, and is drawn and compacted into a solid assembly. The insulating powder therein runs the risk of moisture absorption problems due to poor encapsulation of the thermocouple cold end.
The more mature cold end packaging technology is resin encapsulation. However, in the nuclear field, the resin is easy to age after long-term use under high temperature and irradiation conditions, and the sealing performance is reduced, so that the magnesium oxide absorbs moisture, and the measurement accuracy is reduced.
In addition, the existing sheathed tube structure of the sheathed thermocouple has room for improvement.
Disclosure of Invention
To solve or ameliorate at least one of the problems mentioned in the background, the present utility model provides an armored thermocouple employing a glass-encapsulated cold end.
The embodiment of the utility model provides an armored thermocouple applying a glass packaging cold end, which is characterized by comprising the following components:
the device comprises a first sleeve and a coupling wire, wherein one end of the first sleeve is closed, the other end of the first sleeve is provided with a first sleeve opening, and the coupling wire is arranged on the first sleeve and extends out of the first sleeve from the first sleeve opening;
the second sleeve is sleeved on the outer side of the first sleeve, one end of the second sleeve is connected with the outer peripheral wall of the first sleeve in a sealing mode, a second sleeve opening is formed in the other end of the second sleeve, the distance between the end face of the first sleeve opening and the end face of the second sleeve opening is a, a is larger than 0, and the other end of the first sleeve does not extend out of the other end of the second sleeve;
the third sleeve is connected to the second sleeve in a threaded manner, and the cable is connected to the coupling wire;
the glass insulator is arranged at the opening of the first sleeve, the glass insulator seals the opening of the first sleeve, and one end where the opening of the first sleeve is positioned is a cold end; and
the sealing body is arranged in the third sleeve, and seals gaps among the coupling wires, the cables and the second sleeve and the third sleeve in the second sleeve and the third sleeve.
In at least one embodiment, the seal is a high temperature glue.
In at least one embodiment, the high temperature glue contacts the second sleeve such that the high temperature glue connects the second sleeve and the third sleeve.
In at least one embodiment, the sealing body extends into the second sleeve opening.
In at least one embodiment, the second sleeve is provided with a first hole and a second hole which are coaxial, the diameter of the first hole is not smaller than that of the first sleeve, the diameter of the second hole is larger than that of the first hole, and in the axial direction of the second sleeve, the projection of the glass insulator covers the second hole.
In at least one embodiment, the end of the other end of the first sleeve is located in the second hole, the glass insulator is disposed in the second hole, and the glass insulator covers the first sleeve opening.
In at least one embodiment, the first sleeve and the second sleeve are metal sleeves,
the second sleeve is welded to the outer peripheral wall of the first sleeve.
In at least one embodiment, the armored thermocouple using a glass-encapsulated cold end further comprises an anti-folding tube, wherein the anti-folding tube is arranged at the other end of the third sleeve, and the cable passes through the anti-folding tube and extends out of the other end of the third sleeve.
In at least one embodiment, the coupling filaments are exposed to the glass insulator and the exposed length of the coupling filaments is 1 to 2cm.
In at least one embodiment, the glass insulator is disposed in a position that includes between the first sleeve and the second sleeve.
The utility model enables the armored thermocouple to be suitable for high-temperature and high-radiation working environments in the nuclear field, for example, by arranging the glass insulator at the other end of the first sleeve. Through setting up second sleeve pipe, third sleeve pipe, avoid the sleeve pipe overlength, make the welding process of even silk in the sleeve pipe and other cables simpler and more just third sleeve pipe threaded connection in the second sleeve pipe, avoided e.g. welded high temperature connected mode to the influence of glass insulator internal stress.
The manufacturing method provided by the utility model is used for manufacturing the armored thermocouple, so that the manufacturing method also has the advantages of the armored thermocouple.
Drawings
Fig. 1 shows a schematic diagram of the construction of an armored thermocouple employing a glass-encapsulated cold end in accordance with an embodiment of the present utility model.
Description of the reference numerals
1 a first sleeve; 11 a first sleeve opening; 2 a second sleeve; 21 a first welding spot; 22 a second sleeve opening; 23 a first hole; 24 second holes; 3, a third sleeve; 4, coupling wires; 41 second welding spots; 5 a glass insulator; 6, a cable; 7, sealing the body; and 8, preventing the pipe from being folded.
Detailed Description
Exemplary embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood that these specific illustrations are for the purpose of illustrating how one skilled in the art may practice the utility model, and are not intended to be exhaustive of all of the possible ways of practicing the utility model, nor to limit the scope of the utility model.
Referring to fig. 1, an armored thermocouple (hereinafter, sometimes simply referred to as "armored thermocouple") using a glass-encapsulated cold end according to an embodiment of the present utility model includes a first sleeve 1, a second sleeve 2, a third sleeve 3, a coupling wire 4, and an insulating material such as magnesium oxide, etc.
One end (e.g. the left end in fig. 1) of the first sleeve 1 is closed, which end is the measurement end, i.e. the hot end. The other end of the first sleeve 1 (right end in fig. 1) has a first sleeve opening 11, which is the cold end. An insulating material such as magnesium oxide for the coupling filaments 4 may be provided in the first sleeve 1. And, the coupling filaments 4 may protrude from the first sleeve opening 11 out of the first sleeve 1.
The second sleeve 2 is sleeved outside the first sleeve 1. One end (e.g., the left end of fig. 1) of the second sleeve 2 may be sealingly connected to the outer circumferential wall of the first sleeve 1. Illustratively, one end of the second sleeve 2 is welded to the outer peripheral wall of the first sleeve 1, and the welded portion forms a first welding spot 21, which plays a role in sealing. The other end of the second sleeve 2 has a second sleeve opening 22.
In one embodiment of the utility model, the distance between the end face of the first sleeve opening 11 and the end face of the second sleeve opening 22 is a, and a > 0. The other end (right end) of the first sleeve 1 does not protrude from the other end (right end) of the second sleeve 2.
The armored thermocouple provided by the embodiment of the utility model can further comprise a glass insulator 5, wherein the glass insulator 5 can be arranged at the first sleeve opening 11 and can seal the first sleeve opening 11. In one embodiment of the utility model, a first bore 23 and a second bore 24 are provided coaxially in the second sleeve 2. The second hole 24 has a larger diameter than the first hole 23, and the first hole 23 has a diameter not smaller than the first sleeve 1. The glass insulator 5 may be provided at the second hole 24, and a projection of the glass insulator 5 covers the second hole 24 in the axial direction of the second sleeve 2. And, the glass insulator 5 covers the first sleeve opening 11. Of course, in one embodiment of the utility model, the glass insulator 5 may also extend into the first sleeve opening 11 to seal the first sleeve opening 11.
The process of forming and disposing the glass insulator 5 can refer to the existing glass sealing technique. Wherein the manufacturing process includes heating the glass for sealing to a melting temperature such that the molten glass sufficiently wets the sleeve.
It will be appreciated that both the first sleeve 1 and the second sleeve 2 may be metal sleeves, the metal having a higher coefficient of thermal expansion than glass. In the cooling process, the shrinkage of the sleeve with a large thermal expansion coefficient is larger, and the sleeve generates radial inward compressive stress acting on the glass insulator 5, so that the strength of the glass insulator 5 can be increased, and the glass insulator 5 can realize stable cold end packaging.
In one embodiment of the utility model, the armored thermocouple is applied to the nuclear field, and can be particularly used for temperature monitoring in a high-temperature gas cooled reactor. The heat-resistant temperature of the armored thermocouple can reach 500 ℃, and the service life is estimated to be 60 years.
Compared with the traditional resin sealing material, the glass has the advantages of high strength, high temperature resistance, radiation resistance, difficult aging, high bonding strength with metal and the like. According to the utility model, the cold end of the armored thermocouple is packaged by the glass, the stability of the package sealing of the cold end of the thermocouple can be greatly improved by utilizing the excellent performance of the glass, the possibility of moisture absorption of magnesia powder in the thermocouple is reduced, and the armored thermocouple can be stably used for a long time under severe conditions of high temperature, high pressure and even high radioactivity.
The armored thermocouple provided by the embodiment of the utility model can further comprise a cable 6, a sealing body 7 and an anti-folding tube 8.
The coupling wire 4 may be exposed to the glass insulator 5, for example, the length of exposure may be 1-2 cm, it being understood that the length range may include both end points of 1 cm and 2cm. The exposed coupling wires 4 may be connected to the cable 6. Illustratively, the coupling wire 4 may be welded to the cable 6, where the second weld 41 is formed. It will be appreciated that the coupling wire 4 is welded to the cable 6 in a short period of time and with low energy, and that the heat generated during the welding process has little effect on the internal stress of the glass insulator 5. The cable 6 may be a compensating wire.
The third sleeve 3 may be connected to the second sleeve 2. In one embodiment of the utility model, the third sleeve 3 may be screwed to the second sleeve 2. Of course, the third sleeve 3 may be connected to the second sleeve 2 by a flange, a bolt, or the like.
The sealing body 7 is arranged in the third sleeve 3, and the sealing body 7 can seal gaps between the coupling wires 4 and the cables 6 in the second sleeve 2 and the third sleeve 3 and between the second sleeve 2 and the third sleeve 3 to form sealing protection.
In one embodiment of the utility model the sealing body 7 contacts the second sleeve 2, for example the sealing body 7 protrudes into the second sleeve opening 22 or the sealing body 7 contacts the end face of the second sleeve opening 22. The sealing body 7 may be a high temperature glue. When the sealing body 7 is high Wen Jiaoshi, the sealing body 7 and the second sleeve 2 are arranged in a matching manner, and the high-temperature glue can play a role in connecting the second sleeve 2 and the third sleeve 3. According to the embodiment of the utility model, the connection of the two sleeves can be realized through threads and high-temperature glue. Compared with the threaded connection, the two-sleeve threaded connection tightening degree can be lower, the compressive stress applied to the glass insulator by the sealing body 7 is small, and the risk of sealing failure is reduced.
Illustratively, the high temperature glue may be a meston high temperature sealant. Of course, the brand and model of the high-temperature glue can be specifically selected according to the operating environment. The sealing body 7 is not limited to high temperature glue either.
The cable 6 may include two cables, and the two cables may be converged at the other end of the third sleeve 3. The anti-folding tube 8 may be disposed at the other end of the third sleeve 3, and the cable 6 may extend out of the other end of the third sleeve 3 through the anti-folding tube 8.
The anti-folding pipe 8 can provide support for the cable 6 and plays a role in preventing folding. Illustratively, the anti-collapse tube 8 may be a spring tube, a thickened metal tube, or the like. Of course, a certain flexibility can also be provided when using a spring tube as the anti-fold tube 8.
In one embodiment of the present utility model, the coupling wire 4 may be welded to the cable 6, then the third sleeve 3 may be screwed to the second sleeve 2, a sealing body 7 such as high temperature glue may be added from the other end of the third sleeve 3, a fold-preventing tube 8 may be provided, and the mixture may be left to stand for 24 hours, for example, to wait for the high temperature glue to cure.
Compared with the method of directly welding the second sleeve 2 and the third sleeve 3, the connecting mode between the second sleeve 2 and the third sleeve 3 in the embodiment of the utility model comprises the steps of screw connection and high-temperature glue bonding, thereby avoiding high-temperature connection and avoiding sealing failure caused by uneven stress in the glass insulator 5 during high-temperature connection, and therefore, the connecting mode provided by the utility model can effectively prolong the service life of the armored thermocouple.
Compared with a longer sleeve, the sleeve comprises the second sleeve 2 and the third sleeve 3 which are assembled, so that the welding steps of the coupling wires 4 and the cables 6 can be more simply implemented, and the welding reliability is improved. For example, when a longer sleeve is used, the cable 6 needs to extend into the sleeve to be welded at a deeper position, so that the welding is inconvenient; if the sleeve length is reduced, the welding points between the coupling wires 4 and the cable 6 are easily exposed, and the problem of breakage is caused, so that the connection between the coupling wires 4 and the cable 6 cannot be effectively sealed, and the sealing effect is deteriorated. The sleeve pipes at the two ends which can be spliced and connected solve the problem, ensure sufficient sealing materials, simplify the welding steps of the coupling wires 4 and the cables 6 and facilitate the processing.
On the one hand, glass is brittle, so that the volume of the glass insulator 5 is not necessarily too large; on the other hand, the cable 6 usually comprises a protective material such as rubber, the forming process temperature of the glass insulator 5 is high, and the glass insulator 5 is not in direct contact with the cable 6, so the utility model does not recommend to use the glass insulator 5 to seal the components inside the sleeve entirely.
The utility model also provides an armored thermocouple employing a glass-encapsulated cold end for use in manufacturing the armored thermocouple as described above. Illustratively, the manufacturing method provided by the embodiment of the present utility model may include the steps of:
an insulating material, such as magnesium oxide, is provided in the first sleeve 1 with coupling filaments 4;
welding the first sleeve 1 and the second sleeve 2;
a glass insulator 5 is arranged at the first sleeve opening 11;
welding the coupling wire 4 with the cable 6;
the third sleeve 3 is screwed to the second sleeve 2;
a sealing body 7 such as high-temperature glue is added into the third sleeve 3 from the other end of the third sleeve 3, and the third sleeve stands still for curing the high-temperature glue.
The glass insulator 5 may be cured in the second sleeve 2 and sealed in the first sleeve opening 11.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, and such changes and modifications are intended to be included within the scope of the utility model.
Claims (10)
1. An armored thermocouple employing a glass-encapsulated cold end, comprising:
the device comprises a first sleeve and a coupling wire, wherein one end of the first sleeve is closed, the other end of the first sleeve is provided with a first sleeve opening, and the coupling wire is arranged on the first sleeve and extends out of the first sleeve from the first sleeve opening;
the second sleeve is sleeved on the outer side of the first sleeve, one end of the second sleeve is connected with the outer peripheral wall of the first sleeve in a sealing mode, a second sleeve opening is formed in the other end of the second sleeve, the distance between the end face of the first sleeve opening and the end face of the second sleeve opening is a, a is larger than 0, and the other end of the first sleeve does not extend out of the other end of the second sleeve;
the third sleeve is connected to the second sleeve in a threaded manner, and the cable is connected to the coupling wire;
the glass insulator is arranged at the opening of the first sleeve, the glass insulator seals the opening of the first sleeve, and one end where the opening of the first sleeve is positioned is a cold end; and
the sealing body is arranged in the third sleeve, and seals gaps among the coupling wires, the cables and the second sleeve and the third sleeve in the second sleeve and the third sleeve.
2. The armored thermocouple employing a glass-encapsulated cold end of claim 1 wherein the seal is a high temperature glue.
3. The armored thermocouple employing a glass-encapsulated cold end of claim 2, wherein the high temperature glue contacts the second sleeve such that the high temperature glue connects the second sleeve and the third sleeve.
4. An armored thermocouple employing a glass-encapsulated cold end according to claim 3, wherein said sealing body extends into said second sleeve opening.
5. The armored thermocouple employing a glass-encapsulated cold end of claim 1, wherein the second sleeve has first and second coaxial bores disposed therein, the first bore having a diameter not smaller than the diameter of the first sleeve, the second bore having a diameter larger than the diameter of the first bore, the projection of the glass insulator covering the second bore in the axial direction of the second sleeve.
6. The armored thermocouple employing a glass-encapsulated cold end of claim 5 wherein the end of the other end of the first sleeve is located in the second bore, the glass insulator is disposed in the second bore, and the glass insulator covers the first sleeve opening.
7. The armored thermocouple employing a glass-encapsulated cold end of claim 1, wherein the first sleeve and the second sleeve are metal sleeves,
the second sleeve is welded to the outer peripheral wall of the first sleeve.
8. The armored thermocouple employing a glass-encapsulated cold end of claim 1, further comprising an anti-fold tube disposed at the other end of the third sleeve, the cable extending through the anti-fold tube to the other end of the third sleeve.
9. The armored thermocouple employing a glass-encapsulated cold end of claim 1, wherein the coupling filaments are exposed to the glass insulator and the exposed length of the coupling filaments is 1-2 cm.
10. The armored thermocouple employing a glass-encapsulated cold end of claim 1, wherein the glass insulator is disposed in a position comprising between the first sleeve and the second sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321344323.3U CN219996379U (en) | 2023-05-30 | 2023-05-30 | Armoured thermocouple using glass encapsulation cold end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321344323.3U CN219996379U (en) | 2023-05-30 | 2023-05-30 | Armoured thermocouple using glass encapsulation cold end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219996379U true CN219996379U (en) | 2023-11-10 |
Family
ID=88602957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321344323.3U Active CN219996379U (en) | 2023-05-30 | 2023-05-30 | Armoured thermocouple using glass encapsulation cold end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219996379U (en) |
-
2023
- 2023-05-30 CN CN202321344323.3U patent/CN219996379U/en active Active
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