JP2002107233A - Thermocouple device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a thermal contact between a sheath type thermocouple and a protection tube without any deterioration in assembling workability of a thermocouple device for multipoint measurement so as to increase a temperature measurement precision. SOLUTION: A plurality of sheath type thermocouples 3, 3, etc., are housed inside the protection tube 2. The protection tube 2 is provided with a temperature sensitive area X in which respective temperature measuring side contacts 3a, 3a, etc., of a plurality of sheath type thermocouples 3, 3, etc., are positioned respectively. In the temperature sensitive area X, a spacer 11 is arranged between the protection tube 2 and a plurality of sheath type thermocouples 3, 3, etc. When the protection tube 2 housing a plurality of sheath type thermocouples 3, 3, etc., is shrunk in diameter, the protection tube 2 is brought into tight contact with a plurality of sheath type thermocouples 3, 3, etc., via the spacer 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermocouple device using a sheath-type thermocouple.

[0002]

2. Description of the Related Art Since a sheath-type thermocouple can be miniaturized, it is widely used for temperature measurement. The sheath type thermocouple is usually placed in a temperature measurement environment while housed in a protective tube. The number of sheathed thermocouples housed in the protective tube is not limited to one.For example, when simultaneous measurement of multiple points is performed, a plurality of sheathed thermocouples are housed in the protective tube and the Construct a paired device.

[0003] Such a thermocouple device for multi-point measurement is used, for example, when measuring the temperature distribution of various environments such as liquids and gases, and comprises a plurality of sheath-type thermocouples corresponding to the temperature measurement points. The thermocouple is housed in a protective tube with the contact (tip) position of the thermocouple shifted in sequence.

[0004] In the above-described thermocouple device, in order to perform accurate temperature measurement, it is necessary to keep the sheath-type thermocouple in close contact with the protective tube to maintain good thermal contact. On the other hand, when storing the sheath-type thermocouple in the protective tube, it is essential to form a gap for inserting the thermocouple between them. Can not.

Although the thermal contact between the sheath-type thermocouple and the sheath-type thermocouple can be relatively increased by reducing the gap when the sheath-type thermocouple is inserted into the protective tube, the frictional resistance when the sheath-type thermocouple is inserted is reduced. And the workability of assembling the thermocouple device is greatly reduced. In the thermocouple device for multipoint measurement, for example, since a plurality of sheath-type thermocouples are bundled and inserted into the protective tube, the increase in insertion resistance due to the decrease in the gap becomes remarkable. In particular, as the thermocouple device has a longer insertion length, the assembling workability tends to decrease.

In order to improve the adhesion between the sheath-type thermocouple and the protection tube in the thermocouple device for multipoint measurement, the diameter of the protection tube is reduced (for example, compression reduction) after the sheath-type thermocouple is inserted into the protection tube. However, simply reducing the diameter of the entire protection tube is likely to cause a break in the sheath-type thermocouple. For this reason, a thermocouple device for multipoint measurement that can maintain good thermal contact by keeping a sheath-type thermocouple and a protective tube in close contact with each other without reducing the workability of assembling the thermocouple device. Is required.

[0007] The sheath-type thermocouple in the thermocouple device is connected to a measurement circuit via a compensating lead. Generally, the connection between the thermocouple element of such a sheath-type thermocouple and the compensating conductor is performed by brazing. However, simply connecting by brazing may result in insufficient strength of the connection part.Therefore, a sleeve is placed around the connection part and the sleeve is filled with insulating resin to protect the connection part. ing.

For example, Japanese Patent Application Laid-Open No. 5-88612 discloses a connection device in which the above-mentioned sheath-type thermocouple and a compensating lead are fixed by a fixed body, and then an insulating resin is filled in a sleeve disposed around the thermocouple. It has been disclosed. According to the connection device using the fixed body, since the rotation of the sheath-type thermocouple and the compensating conductor can be suppressed, the effect of suppressing disconnection and short-circuit is exhibited, but the sleeve diameter is reduced by the storage space of the fixed body. There is a problem that it must be increased.

[0009] Depending on the environment in which the thermocouple device is installed, a reduction in the mounting space is required, so that the diameter of the sleeve is reduced, and the disconnection or short-circuit of the connection between the sheath-type thermocouple and the compensating conductor is required. It is desired to control.
In particular, in a thermocouple device for multipoint measurement, a plurality of sheath-type thermocouples must be individually connected to a compensating lead wire.

[0010]

As described above, in the thermocouple device for multipoint measurement, the assembling workability at the time of inserting the sheath-type thermocouple into the protective tube is not reduced.
It is desired to improve the thermal contact (adhesion) between the sheath-type thermocouple and the protective tube.

[0011] Further, in order to reduce the size of the connection between the sheath-type thermocouple and the compensating conductor in the thermocouple device, it is required to reduce the diameter of the sleeve. In particular, in a thermocouple device for multipoint measurement, a plurality of sheath-type thermocouples must be individually connected to a compensating lead wire, and therefore, a reduction in the size of the sleeve is strongly desired.

SUMMARY OF THE INVENTION The present invention has been made to address such a problem, and it is possible to improve the thermal contact between a sheath-type thermocouple and a protective tube without reducing the workability of assembling the thermocouple device. It is an object of the present invention to provide a thermocouple device for multipoint measurement. Another object of the present invention is to provide a thermocouple device that can reduce the size of the connection device while suppressing disconnection and short circuit of the connection portion between the sheath-type thermocouple and the compensating conductor. And

[0013]

According to a first aspect of the present invention, a first thermocouple device includes a plurality of sheath-type thermocouples, the plurality of sheath-type thermocouples, and the plurality of sheath-type thermocouples. A protective tube having a heat-sensitive area where the temperature measurement side contacts of the sheath-type thermocouple are respectively located, and a spacer arranged between the protective tube and the plurality of sheath-type thermocouples in the heat-sensitive area, The protective tube in which the plurality of sheath-type thermocouples are housed is reduced in diameter, whereby the protective tube and the plurality of sheath-type thermocouples in the heat-sensitive area are brought into close contact with each other via the spacer. I have.

[0014] In the first thermocouple device of the present invention, it is preferable that the plurality of sheath-type thermocouples are arranged around the core material as described in claim 2. Further, as described in claim 3, the plurality of sheath-type thermocouples preferably have a stranded structure in a region other than the heat-sensitive region, particularly a stranded structure centering on the core material.

In the first thermocouple device of the present invention, a spacer is interposed between the protective tube and the plurality of sheathed thermocouples, and the spacer is disposed only in the heat-sensitive region. In such a structure, after a plurality of sheath-type thermocouples are arranged in the spacer, they can be inserted into the protective tube, so that by adjusting the diameter and length of the spacer, the inside of the protective tube can be adjusted. Insertion resistance at the time of insertion can be greatly reduced. In other words, it is possible to improve the workability of assembling the thermocouple device. Insertion of multiple sheath-type thermocouples into the spacer is because the length of the spacer is sufficiently shorter than the entire length of the protection tube.
It can be inserted well.

Further, by reducing the diameter of the protective tube in which the plurality of sheathed thermocouples are housed, the protective tube and the plurality of sheathed thermocouples can be brought into close contact with each other via the spacer. At this time, since the protective tube is in close contact with the plurality of sheath-type thermocouples via the spacer, the disconnection of the plurality of sheath-type thermocouples does not occur. As described above, by improving the thermal contact (adhesion) between the protective tube and the sheath-type thermocouple, the temperature of the measurement environment can be accurately measured by each sheath-type thermocouple. That is, it is possible to simultaneously and accurately measure the temperature of the measurement environment at a plurality of points.

According to a second aspect of the present invention, there is provided a thermocouple device comprising: a sheath-type thermocouple; a compensating lead wire connected to the sheath-type thermocouple; In a thermocouple device including a connection portion that protects a connection portion with a compensation lead, the connection portion is configured such that each connection-side end of the sheath-type thermocouple and the compensation lead is inserted and arranged,
A sleeve having an opening fixed to the connection-side end and opened at a position near the connection portion, and an insulating resin filled in the sleeve through the opening. And

In the second thermocouple device according to the present invention, the connection-side end of the sheath-type thermocouple is fixed to the sleeve by brazing, and the connection-side end of the compensating conductor is connected to the sleeve. Preferably, the sleeve is fixed by caulking. Such a second thermocouple device is particularly effective for a multi-point measurement thermocouple device having a plurality of sheath-type thermocouples.

In the second thermocouple device of the present invention, since the connection-side ends of the sheath-type thermocouple and the compensating conductor are directly fixed to the sleeve, the occurrence of disconnection or short circuit due to their rotation is suppressed. Above, the diameter of the sleeve can be reduced (downsizing). In addition, since the opening is provided in the circumferential direction of the sleeve, it is possible to maintain good filling of the insulating resin into the sleeve. That is, it is possible to reduce the size of the sleeve (connection device) while suppressing disconnection or short circuit at the connection between the sheath-type thermocouple and the compensating conductor.

[0020]

Embodiments of the present invention will be described below.

FIG. 1 is a sectional view showing a schematic configuration of a thermocouple device according to an embodiment of the present invention, FIG. 2 is a sectional view showing an enlarged main part thereof, and FIG. 3 is a transverse sectional view. The thermocouple device for multipoint measurement 1 shown in these figures has a tubular protective tube 2 arranged in a temperature measurement environment and having a measurement-side end closed.
Various metal materials such as stainless steel can be used as a constituent material of the protective tube 2. For example, a pipe made of a metal material having corrosion resistance corresponding to a temperature measurement environment is used.

A plurality of sheathed thermocouples 3, 3,... Are accommodated in the above-mentioned protective tube 2, and the plurality of sheathed thermocouples 3, 3,. Simultaneous temperature measurement is possible. Each sheath type thermocouple 3, 3, ...
Each has a structure in which a pair of thermocouple elements 5 and 5 are inserted into a metal sheath 4 and a heat-resistant insulating powder 6 is filled around the thermocouple elements 5 and 5 as shown in FIG.

The plurality of sheathed thermocouples 3, 3,... Are arranged so that the contacts (tips) serving as temperature measuring portions of the pair of thermocouple elements 5, 5 are located in the temperature measuring environment. Is housed inside. The ends of the pair of thermocouple elements 5, 5 are led out from the open end of the metal sheath 4. Then, as shown in FIG. 1, the terminal of the sheath-type thermocouple 3 is connected within an adapter 7 provided at an open end of the protective tube 1 (an end opposite to the temperature measurement end). It is connected to the compensating conductor 9 via a connecting device 8 as a part.

The plurality of sheathed thermocouples 3, 3,... That enable multipoint measurement are integrated by arranging them evenly around the core member 10 as shown in FIGS. I have. The diameter of the core material 10 is determined by the number of sheath-type thermocouples 3, 3,... Arranged according to the number of measured temperatures. Here, the core member 10 may be formed of a metal rod having only the function thereof, or may be formed of a sheath-type thermocouple 3 having the same diameter as shown in FIG.

The plurality of sheathed thermocouples 3, 3,...
.., The positions of the respective temperature measuring contacts 3a, 3a,.
, And housed in the protective tube 2 in this state. Such a plurality of sheathed thermocouples 3, 3
Are provided as a heat-sensitive region (heat-sensitive portion) X in which the above-mentioned contacts (temperature measuring portions) 3a, 3a,.

In the above-described heat-sensitive region X, a plurality of sheath-type thermocouples 3, 3,... Are arranged along the longitudinal direction of the core material 10. In a region Y other than the heat-sensitive region X, the plurality of sheathed thermocouples 3, 3,... Have a stranded structure with the core 10 as a center. The arrangement structure of the plurality of sheath-type thermocouples 3, 3,... In the heat-sensitive region X enhances the adhesion between them and the protective tube 2. On the other hand, in the other region Y, a wire structure is adopted to prevent the plurality of sheathed thermocouples 3, 3, ... from being separated, and this structure protects the plurality of sheathed thermocouples 3, 3, .... The ease of insertion into the tube 2, in other words, the ease of assembling the thermocouple device 1 for multipoint measurement, is enhanced.

In the above-described heat-sensitive region X,
A spacer 11 is interposed between the protective tube 2 and the plurality of sheathed thermocouples 3, 3,. The spacer 11 is made of, for example, a metal tube having excellent heat conductivity. The spacer 11 reduces the resistance of the plurality of sheathed thermocouples 3, 3,... The tightness between the tube 2 and the plurality of sheath-type thermocouples 3, 3,... Is increased, and the thermal contact between them is kept good.

With reference to FIG. 5, the process of inserting a plurality of sheathed thermocouples 3, 3,... Into the protection tube 2 (assembly process) will be described. First, as shown in FIG. 5A, a plurality of sheathed thermocouples 3, 3,... Are arranged along the longitudinal direction of the core material 10 at a portion corresponding to the heat-sensitive region X. At this time, the respective temperature measuring contacts 3a, 3a... Of the plurality of sheathed thermocouples 3, 3... Correspond to predetermined temperature measuring points (for example, positions shifted at predetermined intervals in measuring temperature distribution). Are arranged around the core material 10 so that the sheath-type thermocouples 3, 3,...

Each of the contacts 3a, 3a,... Of the plurality of sheathed thermocouples 3, 3,... Is temporarily fixed to the core member 10 by welding, for example. Further, the plurality of sheathed thermocouples 3, 3,... Corresponding to the region Y other than the heat-sensitive region X are stranded around the core material 10 to prevent them from being separated. In this state, a plurality of sheathed thermocouples 3, 3,...
Insert inside. For example, when the outer diameter (outer diameter in a bundled state) of the plurality of sheathed thermocouples 3, 3,... Arranged around the core member 10 is 2.4 mm, the inner diameter is 2.8 mm and the outer diameter is 3 mm. Such a tubular spacer 11 is used.

At this time, the spacer 11 has a length corresponding to the heat sensitive area X. In other words, since the spacer 11 has a length sufficiently shorter than the entire length of the protection tube 2, the workability is impaired even with a plurality of sheath-type thermocouples 3 for multipoint measurement. And can be satisfactorily inserted into the spacer 11. For example, if the total length of the protection tube 2 is 10
Even when the spacer 11 has a length of about 15 m, the length of the spacer 11 corresponding to the heat-sensitive region X is, for example, about 3 to 5 m. Therefore, a plurality of sheath-type thermocouples 3, 3,... Can be satisfactorily inserted into the spacer 11.

When inserting a plurality of sheathed thermocouples 3, 3,..., For example, the core member 10 is made longer by the length of the spacer 11, and an extended portion (dummy portion) of the core member 10 is formed. By inserting the dummy portion of the core material 10 after the insertion into the spacer 11, a plurality of sheathed thermocouples 3, 3,... Can be more easily arranged in the spacer 11. At this stage, the diameter of the spacer 11 may be reduced in advance so that the spacer 11 is brought into close contact with the plurality of sheathed thermocouples 3, 3,.

Next, as shown in FIG.
are inserted into the protective tube 2 together with the spacers 11 with the a, 3a... arranged in the spacer 11. The inner diameter of the protection tube 2 can be appropriately set according to the outer diameter of the spacer 11. For example, when the outer diameter of the spacer 11 is 3 mm as described above, the protective tube 2 having an outer diameter of 6 mm and an inner diameter of 3.2 mm is used.

At this time, since the contact portions of the plurality of sheathed thermocouples 3, 3... Having the highest insertion resistance are arranged in the spacer 11, the spacer 1 with respect to the inner diameter of the protective tube 2
By adjusting the outer diameter of the first thermocouple 1, a plurality of sheathed thermocouples 3, 3,... In other words, the insertion resistance when a plurality of sheathed thermocouples 3, 3,... Are housed in the protective tube 2 can be greatly reduced.

In particular, even when the entire length of the protective tube 2 is 10 to 15 m, the insertion resistance of the plurality of sheathed thermocouples 3, 3,.
It is possible to greatly improve the assemblability of the multipoint measuring thermocouple device 1 having such a long overall length.

Thereafter, as shown in FIG. 5 (c), the protective tube 2 in which a plurality of sheathed thermocouples 3, 3,... By doing so, the protective tube 2 and the plurality of sheathed thermocouples 3, 3,... At this time, the plurality of sheathed thermocouples 3, 3,...
The protective tube 2 is brought into close contact with the plurality of sheathed thermocouples 3, 3.
A good thermal contact state can be obtained without inducing disconnection or the like.

In compressing and reducing the diameter of the protective tube 2 (diameter reduction), the area Y other than the heat sensitive area X is
Since there is a space for the absence of the spacer 11, even if the diameter of the entire protective tube 2 is reduced, there is no occurrence of disconnection of the plurality of sheathed thermocouples 3, 3,.
That is, while preventing disconnection of the plurality of sheathed thermocouples 3, 3,... And maintaining good assembling workability of the multipoint measuring thermocouple device 1, the protective tube 2 and the sheathed thermocouple 3, 3
... can be improved.

As described above, according to the thermocouple device 1 for multipoint measurement in which the protective tube 2 in the heat sensitive area X and the plurality of sheathed thermocouples 3, 3,... Is long, such as 10 to 15 m, the insertion resistance when arranging a plurality of sheathed thermocouples 3, 3,... In the protective tube 2 is greatly reduced, and good assembling workability is secured. Above, the thermal contact (adhesion through the spacer 11) between the protective tube 2 and the sheath-type thermocouples 3, 3,... Can be improved. Therefore, each sheath type thermocouple 3,
3 can be satisfactorily transferred to each other, so that the temperature of the measurement environment can be accurately measured by the sheath-type thermocouples 3, 3,. That is, the temperature of the measurement environment can be measured simultaneously and accurately at multiple points (a plurality of points).

Next, the connection structure between the sheath-type thermocouple 3 and the compensating conductor 9 in the above-described multi-point measurement thermocouple device 1 will be described.

FIG. 6 is a cross-sectional view showing one embodiment of a connection structure between the sheath-type thermocouple 3 and the compensating lead wire 9. A pair of thermocouple elements 5, 5 are exposed at the connection-side end of the sheath-type thermocouple 3, and in this state, the thermocouple element 5 is inserted from one end of the cylindrical sleeve 12. A sheath insertion hole 12a is provided at a thermocouple side end of the sleeve 12, and the sheath type thermocouple 3 is inserted from the sheath insertion hole 12a. The connection-side end of the sheath-type thermocouple 3 is fixed, for example, by brazing to the sheath insertion hole 12 a of the sleeve 12.

From the other end of the sleeve 12, a compensating lead 9
Are inserted and arranged, and a pair of core wires 13 is exposed at the connection-side end of the compensating lead wire 9. The compensating lead wire 9 is fixed to the sleeve 12 by, for example, swaging the end 12b of the sleeve 12. In this state, the pair of thermocouple elements 5 of the sheath-type thermocouple 3 and the pair of core wires 13 of the compensating lead 9 are connected. The pair of thermocouple elements 5 and the pair of core wires 13 are connected by, for example, brazing (connection portion 1).
4) Yes.

Further, the sleeve 12 has an opening 15 provided in the circumferential direction. The opening 15 is opened at a position near the connecting portion 14 between the thermocouple element 5 and the core wire 13. The insulating resin 16 such as an epoxy resin is filled in the sleeve 12 through the opening 15. The insulating resin 16 protects the connection portion 14 between the sheath-type thermocouple 3 and the compensating lead wire 9 and suppresses disconnection and short-circuit at the connection portion 14.

The connecting device 8 serving as a connecting portion between the sheath-type thermocouple 3 and the compensating lead wire 9 by the above-described components.
Is configured. According to such a connecting device 8, since the connection-side ends of the sheath-type thermocouple 3 and the compensating conductor 9 are directly fixed to the sleeve 12, the occurrence of disconnection or short-circuit due to their rotation is suppressed. In addition, the diameter of the sleeve 12 can be reduced (downsizing). For example, when the sheath-type thermocouple 3 having an outer diameter of 1 mm is used, the outer diameter of the sleeve 12 can be reduced to 4 mm.

Further, although the diameter of the sleeve 12 is reduced as described above, since the opening 15 is provided in the circumferential direction of the sleeve 12, the insulating resin 16 can be surely and in the sleeve 12. It can be filled well. For example, like the conventional sleeve 12, the sleeve 1
When the insulating resin 16 is to be filled from the end side of 2,
Since the diameter of the sleeve 12 is reduced, the insulating resin 16
Is significantly reduced.

On the other hand, in this embodiment, an opening 15 serving as a filling port of the insulating resin 16 is provided near the connecting portion 14 between the sheath-type thermocouple 3 and the compensating conductor 9 on the cylindrical surface of the sleeve 12. The opening 1 in the sleeve 12.
5, the insulating resin 16 can be reliably and satisfactorily filled. This not only enhances the protection of the connecting portion 14 between the sheath-type thermocouple 3 and the compensating lead wire 9 but also increases the
This greatly contributes to the suppression of disconnection, short circuit, and the like.

The reduction in the diameter of the sleeve 12 as described above, in other words, the reduction in the size of the connecting device 8 is particularly effective for the thermocouple device 1 for multipoint measurement. That is, in the multi-point measurement thermocouple device 1, a plurality of sheathed thermocouples 3, 3
... must be individually connected to the compensating conductors 9, 9 ...
Furthermore, since these must be arranged in the adapter 7, the size of the entire device can be reduced by reducing the size of the connection device 8. This is effective when it is required to reduce the mounting space due to the installation environment of the thermocouple device 1 for multipoint measurement.

In the above-described embodiment, the case where the miniaturized connecting device 8 is used for connecting the sheath-type thermocouple 3 and the compensating conductor 9 in the multipoint measuring thermocouple device 1 has been described. However, the connection device 8 according to the present invention is not limited to the thermocouple device 1 for multipoint measurement,
It functions effectively also in a usual one-point measurement type thermocouple device.

[0047]

As described above, according to the first thermocouple device of the present invention, the thermal contact between the sheath-type thermocouple and the protective tube can be improved without lowering the assembling workability. This makes it possible to simultaneously and accurately measure the temperature of the measurement environment at a plurality of points. Further, according to the second thermocouple device of the present invention, it is possible to reduce the size of the connection portion (connection device) while suppressing disconnection or short circuit at the connection portion between the sheath-type thermocouple and the compensating conductor. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of a thermocouple device for multipoint measurement according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the thermocouple device for multipoint measurement shown in FIG.

FIG. 3 is an enlarged sectional view of a main part when the thermocouple device for multipoint measurement shown in FIG. 1 is cut in a diameter direction.

FIG. 4 is a cross-sectional view showing a modification of the multipoint measurement thermocouple device shown in FIG.

FIG. 5 is a diagram showing an example of an assembling process of the multipoint measuring thermocouple device shown in FIG. 1;

6 is a cross-sectional view showing an example of a connection structure between a sheath-type thermocouple and a compensating lead wire in the thermocouple device for multipoint measurement shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Thermocouple device for multi-point measurement 2 ... Protective tube 3 ... Sheath type thermocouple 8 ... Connection device 9 ... Compensating lead wire 10 ... Core material 11 ... Spacer 12 ... Sleeve 14 ... Sheath type Connection part between thermocouple and compensating lead wire 15 Opening 16 Insulating resin

Claims (6)

[Claims] A plurality of sheathed thermocouples; a plurality of sheathed thermocouples; a plurality of sheathed thermocouples; and a protective tube having a heat sensitive region in which a temperature measurement side contact of each of the plurality of sheathed thermocouples is located; A spacer disposed between the protective tube and the plurality of sheathed thermocouples in a region, wherein the diameter of the protective tube in which the plurality of sheathed thermocouples is accommodated is reduced, whereby the heat-sensitive region is reduced. Wherein the protective tube and the plurality of sheathed thermocouples are brought into close contact with each other via the spacer. 2. The thermocouple device according to claim 1, wherein the plurality of sheath-type thermocouples are arranged around a core material. 3. The thermocouple device according to claim 1, wherein the plurality of sheath-type thermocouples have a stranded structure excluding the heat-sensitive region. 4. A thermocouple device comprising: a sheath-type thermocouple, a compensating lead connected to the sheath-type thermocouple, and a connecting portion that protects a connection portion between the sheath-type thermocouple and the compensating lead. The connection portion is configured such that each connection-side end of the sheath-type thermocouple and the compensating lead wire is inserted and disposed, and the connection-side end is fixed, and an opening that is opened at a position near the connection portion. A thermocouple device comprising: a sleeve having an opening; and an insulating resin filled in the sleeve through the opening. 5. The thermocouple device according to claim 4, wherein a connection-side end of the sheath-type thermocouple is brazed and fixed to the sleeve, and a connection-side end of the compensating wire is connected to the sleeve. A thermocouple device fixed by tightening. 6. The thermocouple device according to claim 4, comprising a plurality of said sheath-type thermocouples, wherein said plurality of sheath-type thermocouples are individually connected to said compensating conductor via said connection portions. A thermocouple device characterized by the above-mentioned.