JP4986879B2 - Thermocouple adapter structure and sheath thermocouple - Google Patents

Description

  The present invention relates to a thermocouple adapter portion and a sheath thermocouple used for connecting a sheath portion of a sheath thermocouple and a compensation lead wire.

  Here, a sheath thermocouple that is attached to the barrel wall of a gas turbine in a power plant or the like and used for exhaust gas temperature measurement will be described as an example. The thermocouple of the present invention is not limited to the above-described exhaust gas temperature measurement, and can be applied to temperature measurement at any part where heat resistance and vibration resistance are required.

  Sheath thermocouples are frequently used as temperature sensing means for high-temperature corrosive gas (400 to 600 ° C.) such as the exhaust gas.

  The sheath thermocouple 12 includes, for example, a sheath part 14 and a compensation conductor part 16, and an adapter part 18 that connects the sheath part 14 and the compensation conductor part 16 (see FIG. 1).

  The adapter portion 18 fixes and covers a wire connecting portion between a pair of strands projecting from the sheath tube (metal tube) of the sheath portion 14 and a pair of conductors projecting from the protective tube of the compensation conducting wire portion 16. It is.

  For example, a metal sleeve (metal tube) is filled with a filler (insulating fixing material) in an annular space formed by crimping the both ends of the sheath portion (sheath tube) and the compensating conductor portion (protective tube). ) To fill the wire connection.

  As the filler, a heat-resistant organic polymer is used as in Patent Documents 1 and 2, or an insulating inorganic powder (for example, magnesia) is used as in Patent Documents 3 and 4. And when measuring to ultra high temperature (about 1000 degreeC or more) like a gas turbine, what used insulating inorganic powder as a filler was used.

  Here, the compensating lead wire portion 16 is a bendable one in which a pair of (compensating) lead wires are usually covered with glass wool or the like and further covered with a protective tube made of a stainless wire braid, a stainless bellows tube, or the like. In the case of a gas turbine, the length of the compensating lead wire is usually 360 to 500 mm.

  The sheath thermocouple 12 is attached to the barrel wall 28 of the gas turbine as follows.

  The barrel wall 28 of the temperature measuring point of the gas turbine is attached with a thermocouple mounting seat tube 30 passing therethrough. A fixing nipple 32 is attached to an intermediate portion of the sheath portion 14 of the sheath thermocouple 12.

  Then, after the sheath portion 14 of the sheath thermocouple 12 is inserted into the thermocouple mounting seat tube 30 and fixed by the nipple 32, the core wire 34 at the other end of the compensation conductor portion 16 is connected to the reference contact via the connection terminal 36. Connect to a device (converter) (not shown).

  And the length of the conventional sheath part 14 was usually relatively long with 2500-3000 mm. This is because the adapter portion 18 is positioned at a portion (usually 1500-2500 mm from the barrel wall) that is not significantly affected by heat and vibration from the furnace wall. If the adapter part is affected by heat and vibration, disconnection may occur in the adapter part.

  However, if the length of the sheath portion 14 is long, the surplus length of the compensation conductor portion is relatively increased, and the curvature (bending curvature) of the compensation conductor portion 16 is increased. As a result, the return force of the compensation conductor portion increases, making it difficult to attach and remove the thermocouple.

  In addition, when the thermocouple is attached / detached, the return force repeatedly acts on the sheath part base part and the adapter part of the thermocouple. At this time, there is a risk of disconnection of the sheath portion and adapter portion of the thermocouple, and the sheath portion and adapter portion of the thermocouple are all separated from the compensating conductor portion and replaced every time. Incidentally, the gas turbine (5 shafts) of the power plant has, for example, 21 thermocouples attached to one shaft.

In addition, Patent Documents 1 to 4 are the nine cases that were hit by the logical expression “(Summary + Claim) Thermocouple AND (Same) Adapter AND (IPC) G01K7 / 02” in the Gazette Text Search of the JPO Digital Library. There are four cases that seem to be related.
JP 2003-270053 A JP 11-166868 A Japanese Patent Laid-Open No. 11-166867 JP 7-239277 A

  From the viewpoint of the workability of attaching and detaching the thermocouple, it is conceivable to shorten the length of the sheath tube portion of the thermocouple in order to reduce the return force due to the high curvature of the compensating conductor portion.

  However, when the sheath length of the thermocouple is shortened, the adapter portion is positioned at a position that is affected by heat transfer and vibration from the gas turbine wall.

  In this case, it was found that the use of an inorganic (insulating inorganic powder) as the filler for the adapter part can eliminate the heat resistance requirement to some extent, but it is difficult to solve the problem of vibration resistance. That is, it has been found that the wire connecting portion between the sheath portion strand and the compensation conducting wire portion is easily broken by receiving vibration from the barrel wall.

  In view of the above, an object of the present invention is to provide a thermocouple adapter part structure having excellent heat resistance and vibration resistance, and a sheath thermocouple provided with the adapter part.

  In order to solve the above-mentioned problems, the present inventors have made intensive efforts to develop, and as a result, have found that the main reason for the disconnection is as follows.

  Since the inorganic powder as the internal fixing material is continuously vibration filled in the thermal sleeve, the line connecting portion repeatedly receives vibration during the filling. For this reason, there is a possibility that the brazed portion of the line connecting portion may be damaged. Furthermore, the internal filler is powder and is not dense enough to prevent internal movement. For this reason, when receiving vibration from the turbine barrel wall, the wire connecting portion (brazing portion) is subjected to slight vibration, and disconnection is likely to occur early (inferior in durability).

  Based on the above findings, the inventors have arrived at the structure of the thermocouple adapter portion having the following configurations.

1) The structure of a thermocouple adapter part that covers a wire connection part between a wire protruding from a sheath tube of a sheath part and a conductive wire protruding from a protective tube of a compensating lead wire part,
The thermocouple adapter part is composed of a metal sleeve that is closed at both ends and hermetically covering the periphery of the wire connection part between the wire and the conductive wire, and an inorganic filling that is filled in the metal sleeve and insulates and fixes the wire connection part. In what is provided with a filling portion formed of a material,
The inorganic filler is a liquid curing type inorganic adhesive,
In the metal sleeve, the reinforcing member is disposed between the end portions of the sheath tube and the protective tube so as to have caulking coupling portions at both ends.

  By making the inorganic filler into a liquid curing type inorganic adhesive, filling into the metal sleeve becomes easy. That is, it is not necessary to apply continuous vibration as in powder filling. That is, when the inorganic filler is filled, the vibration that adversely affects the connection strength of the line connecting portion may be intermittent. In the present specification, the liquid state is a concept including not only the original liquid but also a slurry and a paste.

  Further, the sheath part and the compensating conductor part can be coupled at a position as close as possible to the line connecting part by the reinforcing member. Even if a large tensile force acts between the sheath portion and the compensating conductor portion, most of the tensile force is received by the metal sleeve. At this time, the force received by the wire connecting portion is significantly smaller than when a tensile force is received by the conventional coupling force between the sheath portion and the compensating conducting wire portion.

  2) In the above-described configuration, the reinforcing member may be formed of a cylindrical body, both ends may be crimped coupling portions, and a notch portion in the busbar direction may be provided in the intermediate portion. Filling with an inorganic adhesive becomes easy.

  3) In each of the above configurations, (a) a configuration in which both the sheath portion side and the compensating conductor portion side of the metal sleeve are caulking coupling portions, or (b) the sheath portion side of the metal sleeve is caulking coupling portions, The compensation conducting wire part side can be configured as a moisture-proof seal and fixing part with a liquid curing type inorganic sealant.

  In the case of the above (a), the fixing force of the metal sleeve to the compensating conductor portion is increased as compared with the case of (b). In the case of (b), the caulking work on the compensating conductor portion side of the metal sleeve is not necessary, and the infiltration of moisture from the compensating conductor portion side can be reduced.

  In the case of (a) above, if a moisture-proof seal part is formed with a liquid curing type inorganic sealant at least inside the caulking joint part on the compensation conductor part side of the metal sleeve, moisture permeation from the compensation conductor part side is prevented. Can be reduced.

  4) In each of the above configurations, the caulking coupling portion on the sheath portion side of the metal sleeve and the reinforcing member can be a polygon caulking. By using the polygonal caulking, the connectivity of the metal sleeve and the reinforcing member to the sheath portion (which receives larger vibrational energy than the compensation conducting wire portion) is increased. In other words, the sheath portion side receives a large amount of vibration energy as compared with the compensating lead wire portion side, and therefore the adapter portion side is required to have a greater connectivity than the sheath portion side.

  5) The thermocouple to which the structure of the thermocouple adapter portion of each of the above configurations is applied is included in the technical scope of the present invention. In this case, the configuration of the sheath portion length of 200 to 1400 mm (half of the conventional product) The following length). As a result, since the compensation lead wire is also required to have heat resistance, it is desirable that the compensation lead wire has a protective tube provided with a ceramic fiber coating layer.

  The structure of the thermocouple adapter part of the present invention is excellent in heat resistance and vibration resistance, and the sheath length can be made as short as possible. As a result, it becomes easy to attach / remove the thermocouple of the compensation conductor portion.

  Hereinafter, the present invention will be described based on preferred embodiments of the structure of the thermocouple adapter section. About the same part as the above-mentioned example, the same figure code | symbol is attached | subjected and those description is abbreviate | omitted all or one part.

  Here, the case where it applies to the thermocouple of the following specification used for gas turbine exhaust gas temperature measurement as a thermocouple is demonstrated and demonstrated (refer FIG. 1).

Sheath part: length: 400-800 mm, outer diameter: 1.0-8.0 mm
Compensation conductor part length: 2000 to 3000 mm, outer diameter: 6.0 to 10.0 mm, ceramic fiber coating, outer stainless steel fiber shield.

  FIG. 2 shows an embodiment of the present invention.

  It is assumed that the thermocouple adapter portion 18 has a structure that covers the wire connection portion 38 between the element wire 22 protruding from the sheath tube 20 of the sheath portion 14 and the conductor wire 26 protruding from the protective tube 24 of the compensating lead wire portion 16.

  The thermocouple adapter unit 18 includes a metal sleeve 40 having both ends closed and hermetically covered around the wire connection part 38 between the element wire 22 and the conductive wire 26, and the metal sleeve 40 filled in the wire connection part 38. And a filling portion 42 formed of an inorganic filler that insulates and fixes the material. The metal sleeve 40 is caulked at both ends. Up to this point, the structure of the thermocouple adapter described in Patent Document 4 is basically the same.

  Here, the material of the metal sleeve 40 is usually a stainless steel tube assuming that it is used in a corrosive atmosphere, but may be a steel tube.

  The specifications of the metal sleeve 40 differ depending on the thermocouple specifications. In the case of the above specifications, the outer diameter is 10 to 20 mmφ, the length is 50 to 100 mm, and the wall thickness is 0.3 to 0.6 mmt.

  And when connecting by caulking, it is also possible to caulk both ends of the same metal tube. However, from the viewpoint of workability of filling with the inorganic filler, in the illustrated example, the caulking coupling on the compensating conductor portion 16 side is a cap (conducting wire) having a sleeve fitting portion 44a and a compensating conductor fitting portion 44b, which are separate pieces. Stopping member) 44 is performed.

  At this time, the cap 44 and the metal sleeve 40 are usually joined by spot welding. The caulking coupling of the metal sleeve 40 (or cap 44) to the sheath portion 14 (sheath tube 20) and the compensation conducting wire portion 16 (protective tube 24) is a polygon caulking (for example, octagon caulking).

  In the present embodiment, the inorganic filler is a liquid curing type inorganic adhesive (ceramic adhesive).

  The inorganic adhesive can be filled into the metal sleeve 40, and when vibration is transmitted to the metal sleeve 40 through the sheath tube 20 of the sheath portion 14, the line connecting portion 38 is connected to the metal sleeve 40. There is no particular limitation as long as it can be firmly coupled to such an extent that it does not vibrate within the range and has a predetermined heat resistance and insulation.

For example, the maximum operating temperature (heat-resistant temperature) is 1000 ° C. or higher (more preferably 1300 ° C. or higher), the volume resistivity (23 ° C., 55% RH): 10 ⁸ Ω · cm or higher (more preferably 10 ¹⁰ Ω · cm or higher) ), Linear expansion coefficient (0-600 ° C. average): 1 × 10 ^{−5 to} 20 × 10 ⁻⁵ / ° C. cured product characteristics shall be exhibited.

  More specifically, “Ceramic Adhesive C Series” marketed by Showa Polymer Co., Ltd. under the registered trade name “Hyperrandom” can be mentioned. For example, “901” (silica / alumina type: paint type), “989” (alumina type: paste type), “944” (silica type: powder), “919” (zirconia type) and the like can be suitably used. In addition, what is in the form of “powder” is used as a cream (paste) by adding water.

  In the present embodiment, the reinforcing member 50 further includes first and second caulking coupling portions 52 and 54 at both ends between the end portions of the sheath tube 20 and the protective tube 24 in the metal sleeve 40. It is arranged. The form of the reinforcing member 50 protects the wire connecting portion 38 from the influence of the tensile force when a large tensile force acts between the sheath portion 14 (sheath tube 20) and the compensation conducting wire portion 16 (protective tube 24). It will not specifically limit if there exists an effect | action to perform.

  Specifically, in the illustrated example, the reinforcing member 50 has a cylindrical shape, and further has a notch portion 56 in the busbar direction at the intermediate portion. Specifically, the first and second caulking coupling portions 52 and 54 at both ends of the reinforcing member are formed such that the first caulking coupling portion 52 on the sheath portion 14 side has an annular shape, and the second caulking coupling portion on the compensating conductor portion 16 side. 54 is a split circle. The reason for making a split circle is to facilitate the pliers caulking described later.

  In addition, the notch part 56 is made into the notch part by 1/4 to 1/2 of a surrounding surface along a bus-line in the intermediate part (in the example of a figure). The notch 56 serves as a filling port for an inorganic filler (inorganic adhesive).

  In addition, although the diameter and length of the cylindrical body which form the reinforcement member 50 differ with the specifications of a thermocouple, in the case of the said specification, outer diameter: 3-8 mmphi, length: 30-50mm, thickness: 0. 3 to 0.6 mmt, notch length: 20 to 40 mm.

  The first caulking coupling portion 52 on the side of the sheath portion 14 in the reinforcing member 50 is usually a polygonal caulking (for example, an octagonal caulking or a hexagonal caulking) from the viewpoint of securing the coupling force (sliding resistance). In the illustrated example, the second caulking coupling portion 54 on the compensation conductor portion 16 side is plied caulking from the viewpoint of workability. Like the sheath side, it may be a polygonal caulking. Although the number of man-hours increases, plied caulking makes it easier to ensure the bonding strength (slip resistance).

  For example, the length of the first and second caulking coupling portions 52 and 54 is normally 5 to 8 mm when performed on the sheath tube having the above specifications.

  Next, a method for manufacturing the structure of the adapter portion 18 will be described.

  1) The wire (core) 22 protruding from the sheath tube 20 of the sheath portion 14 is exposed, and the mouth is sealed by a conventional method. On the other hand, the tip of the conductor 26 protruding from the compensating conductor 16 is stripped. Then, the lead wire 26 and the element wire 22 are brazed with each other plus and minus with silver brazing or the like to form a line connecting portion 38.

  2) The reinforcing member 50 is fitted from the distal end side of the sheath portion 14 and moved to a predetermined position. The first and second caulking coupling parts 52 and 54 are formed by performing polygonal caulking (mechanical caulking) on the sheath part 14 side with a press machine and manual caulking on the compensating conductor part 16 side with pliers or the like.

  3) Then, the reinforcing member 50 is leveled so that the notch 56 is on the upper side, and the above-mentioned liquid curing type inorganic adhesive is intermittently vibrated from above so as not to mix air and filled. Do. After filling, heat curing (for example, 80 ° C. × 4 h) is performed. In addition, if the fluidity | liquidity of the inorganic type filler (inorganic type adhesive) with which a reinforcement member is filled is favorable, it can also be set as the perforated plate or slit or frame structure which has an equal inflow hole in the perimeter. When an inorganic adhesive is vibration-filled in a metal sleeve 40 described later, it may be filled simultaneously.

  4) Next, the metal sleeve 40 is fitted from the sheath part 14 side, and polygonal caulking 48 is performed on the sheath part 14 side by a press machine. Then, in the state where the metal sleeve 40 is erected, the above-mentioned liquid filler-type inorganic filler (adhesive) is filled from the compensating conductor portion 16 side and from the opening end side of the metal sleeve 40. . In this case, similarly to the above, filling is performed by intermittently vibrating so as not to form bubbles in the adhesive filling portion. Finally, the cap 44 is fitted from the compensation conductor portion 16 side, the sleeve fitting portion 44a is fitted and spot welding is performed, and then the compensation conductor fitting portion 44b is crimped to the protective tube 24 of the compensation conductor portion 16 by caulking 49. Join.

  FIG. 3 shows another embodiment.

  In the embodiment shown in FIG. 2, the metal sleeve 40 has a moisture-proof seal / fixing portion 46 made of a liquid curing type inorganic sealant instead of closing the base portion (compensation lead wire portion side) with the cap 44. It is. The same parts as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.

The inorganic sealant is not particularly limited as long as it can exhibit heat resistance and moisture resistance. For example, it is possible to use a material having a cured physical property of maximum use temperature (heat-resistant temperature): 1000 ° C. or more and moisture absorption (23 ° C. × 95% RH × 72 h): 1% or less. More specifically, “Aron Ceramic W” marketed by Toa Gosei Co., Ltd. under the trade name “Aron Ceramic” (registered trademark) (alumina, heat-resistant temperature: 1300 ° C., moisture absorption: 0.4% ) Can be used. Although Aron ceramic itself exhibits excellent insulating properties (8 × 10 ¹⁰ Ω · m), it does not necessarily require a high degree of insulating properties.

  In the configuration shown in FIG. 2, the inside of the metal sleeve 40 is filled with an inorganic adhesive, but the base portion side (compensation lead wire side) of the metal sleeve 40 is an inorganic liquid curing type inorganic material. It is desirable to form the moisture-proof seal portion 46A with a system sealant (see the two-dot chain line portion). In this case, the inside of the metal sleeve 40 (adapter 18) has a moisture-proof structure, and variations in temperature measurement values due to humidity changes are reduced (measurement value accuracy is improved).

  Next, the sheath thermocouple 12 having the structure of the thermocouple adapter portion of each of the above embodiments is used by being attached to the barrel wall 28 of the gas turbine in the same manner as described above.

  In addition, the sheath thermocouple of this embodiment has a significantly shorter sheath portion (for example, 2800 mm to 500 mm) than the conventional one, so that the reference contact device can be used without forcibly bending the compensating lead wire portion. (Converter) (not shown) can be easily connected and wired. Further, since the sheath portion is short, an excessive force does not act on the sheath portion, so that the possibility that the sheath tube 20 is broken or the disconnection occurs in the adapter portion 18 during attachment / detachment is greatly reduced.

  Further, even when subjected to repeated vibrations, when filling the liquid curable inorganic filler (inorganic adhesive) to form the filling portion 42, the filling of the wire connecting portion is performed without much vibration. There is almost no possibility of damage to the attachment. Further, the filling portion 42 formed by curing the inorganic adhesive does not have a minute gap like an inorganic powder, and even if vibration is transmitted to the adapter portion via the sleeve portion, the filling material is minute vibration. Never move.

  With respect to the thermocouples of Examples 1 and 2 each having an adapter structure having the following specifications, 1) a tensile test, 2) a heat resistance test, and 3) a vibration resistance test were performed.

  In addition, the sheath part and the compensation conducting wire part used the following specification.

<Example 1: FIG. 2>
Metal sleeve: body outer diameter 12mm, thickness 0.5mm, full length (L1) 74mm
Reinforcing member: Full length (L2) 40mm, outer diameter 8mm, thickness 0.5mm
Filler: Hyperrandom <Example 2: FIG. 3>
Metal sleeve: body outer diameter 12mm, thickness 0.5mm, 60mm
Reinforcing member: Same as Example 1.

Filler: Hyper Random, Moisture Proof / Fixed Part (3 mm): Aron Ceramic 1) Tensile Test Each of the test products 3 under the conditions of normal temperature atmosphere and tensile speed (1 mm / min) using a commercially available tensile tester (ISO5893 compliant). I went about each book.

  The sheath portion 14 and the compensation lead wire portion 16 are chucked by the fixed portion and the movable portion of the tensile tester with the adapter portion 18 interposed therebetween, and the lead wire 26 is exposed from the compensation lead wire portion 16 and connected by a tester (ammeter). . And the said tension test was done, confirming conduction | electrical_connection by this tester, the load at the time of disconnection generation | occurrence | production or a test machine fracture | rupture detection was measured, and the average value was calculated | required.

  The results were Example 1: 0.817 kN and Example 2: 0.727 kN.

  For comparison, a similar tensile test was performed on an adapter part similar in specification to that of Example 1 (FIG. 2) and filled with magnesia powder as an inorganic filler. Disconnection occurred.

2) Heat resistance test Each of the three test products is exposed to an electric constant temperature furnace at a set temperature of 350 ° C, which is equivalent to the maximum temperature of 342 ° C under the actual installation environment, for a total of 40 hours (starting, stopping, 17:00 cycle for 5 days) Then, conductor resistance measurement was performed with a commercially available resistance meter. As a result, disconnection did not occur in both Examples 1 and 2.

3) Vibration resistance test On the base with the eccentric motor attached, it is fixed with the same structure as the actual machine. That is, it fixes on the base via the board provided with the attachment structure similar to a turbine barrel wall.

  As the vibration value, vibration acceleration was used in order to evaluate damage (damage) due to vibration to the thermocouple. The numerical value was set to 0.6 G which is 10 times the vibration acceleration of 0.06 G in the vicinity of the actual machine mounting position. The time for the vibration excitation test was 230 h corresponding to about 4 years.

  If the vibration acceleration is 10 times, the time axis is accelerated 100 times (proportional to the square of the acceleration ratio), and if the unit operation time is 16 h / d, an accelerated test equivalent to 23000 h (about 4 years) can be performed. Become.

  For each of the three test pieces, after the vibration load test, a) appearance inspection (visual observation), b) conductor resistance measurement inspection, c) radioscopic (RT) inspection, d) tensile test (the above-mentioned ( The test of each item of 1) was the same as the tensile test of 1).

  The test results are as shown in Table 1, and no abnormality was found in any of the test items in Examples 1 and 2.

４）加湿試験
温度２６℃、湿度（ＲＨ）８５％の環境下において、実施例１・２の熱電対１２本を８０ｈ放置し、１ｈ毎に絶縁抵抗測定を行った。

4) Humidification test In an environment of a temperature of 26 ° C and a humidity (RH) of 85%, twelve thermocouples of Examples 1 and 2 were left for 80 hours, and insulation resistance was measured every 1 hour.

  As a result of the test, the insulation was slightly reduced inside the adapter, but “20 MΩ / 100 VDC or more” defined in Japanese Industrial Standard “Sheath Thermocouple” (JIS C1605-1995) (2) Electrical Characteristics Table 7 The insulation resistance value could be maintained. In other words, it was confirmed that there was no performance degradation that caused a problem with the actual machine.

It is an installation mode explanation sectional view of a sheath thermocouple. It is sectional drawing which shows one Embodiment of the structure of the thermocouple adapter part of this invention. It is sectional drawing which shows the deformation | transformation aspect of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 ... Sheath thermocouple 14 ... Sheath part 16 ... Compensation conducting wire part 18 ... Thermocouple adapter part 20 ... Sheath tube 22 ... Elementary wire 24 ... Protection tube 26 ... Conductor 40 ... Metal sleeve 42 ... Filling portion 46 ... Moisture proof seal / fixing portion 46A ... Moisture proof seal portion 50 ... Reinforcement member 52 ... Caching joint on the sleeve side of the reinforcement member 54 ... Compensation lead wire side caulking coupling part of reinforcing member 56 ... Notch part of reinforcing member

Claims (8)

The structure of the thermocouple adapter part that covers the wire connection part of the wire protruding from the sheath tube of the sheath part and the conductor protruding from the protective tube of the compensating lead wire part,
The thermocouple adapter part includes a metal sleeve that is closed at both ends and hermetically covers the periphery of the wire connection part between the element wire and the conductive wire, and an inorganic member that is filled in the metal sleeve and insulates and fixes the wire connection part. In what is provided with a filling portion formed of a system filler,
The inorganic filler is a liquid curing type inorganic adhesive, and
In the metal sleeve, a reinforcing member is disposed between the end portions of the sheath tube and the protective tube, with caulking coupling portions at both ends.
The structure of the thermocouple adapter part characterized by this.   The thermocouple adapter part according to claim 1, wherein the reinforcing member is formed of a cylindrical body, both ends thereof are caulking coupling parts, and a notch part in a busbar direction is provided at an intermediate part. Structure.   The structure of the thermocouple adapter part according to claim 1 or 2, wherein the metal sleeve has a caulking coupling part on both the sheath part side and the compensation conductor part side.   4. The thermocouple adapter part according to claim 3, wherein a moisture-proof seal part is further formed of a liquid curing type inorganic sealant at least inside the caulking joint part on the compensation conductor part side of the metal sleeve. Structure.   3. The metal sleeve according to claim 1 or 2, wherein the sheath portion side of the metal sleeve is a caulking joint portion, and the compensation conductor portion side is a moisture-curing seal and fixing portion with a liquid curing type inorganic sealant. Thermocouple adapter structure.   The thermocouple adapter part structure according to any one of claims 1 to 5, wherein a caulking joint part on the sheath part side of the metal sleeve and the reinforcing member is a polygon caulking. A thermocouple comprising a thermocouple adapter portion for connecting the sheath portion, the compensation conductor portion, and both,
The sheath thermocouple is characterized in that the sheath part length is 200 to 1400 mm, and the structure of the thermocouple adapter part is any one of claims 1 to 6. 8. The sheath thermocouple according to claim 7, wherein the protective tube of the compensating lead wire portion is provided with a ceramic fiber layer.

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