JPH11166868A - Sheathed thermocouple - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheathed thermocouple which can prevent the disconnection of a compensation lead wire even if the compensation lead wire is curved during use. SOLUTION: A sheathed thermocouple has a structure in which a thermocouple element wire 12 in a sheath element part 11 is connected to the conductor 14 of a flat compensation lead wire 13 covered with a cover material 15 and the sheath element part 11 and the compensation lead wire 13 including the connection are covered with an adapter member 16. In this case, a fitting 18 for fixing the element wire of the compensation lead wire 13 in place is attached to the part of the compensation lead wire 13 located inside the adapter member 16, and the cover material 15 of the compensation lead wire 13 is caulked to the conductor 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sheath-type thermocouple.

[0002]

2. Description of the Related Art As a conventional sheath-type thermocouple, one having a structure shown in FIG. 4 is known. Sheath element part 1
Has thermocouple strands 2 and 2. Flat compensation wire 3 is 2
It has a structure in which the core wires 4 and 4 are covered with a coating material 5. The thermocouple wires 2 and 2 of the sheath element portion 1 are connected to the core wires 4 and 4 at one end of the flat compensation lead wire 3 by brazing or welding. A crimp terminal 5 is attached to each of the core wires 4 at the other end of the compensating lead wire 3.
The cylindrical adapter member 6 is connected to the sheath element 1.
And the compensating conducting wire 3. A fixing material 7 such as an epoxy resin or silicone rubber is filled inside the adapter member 6.

When the compensating lead wire 3 is bent when the sheath-type thermocouple having the above-described structure is used, the inner and outer bending radii of the bent portion are different as shown in FIG. , 4, the core wires 4, 4 located outside the bend R are pulled away from the connecting portion as shown by the arrow A, and the core wires 4 located inside the bending radius are connected to the connection as shown by the arrow B. Pushed to head. As a result, since the core wire 4 located outside the bending radius is pulled away from the connection portion, disconnection occurs at the connection portion.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheath-type thermocouple capable of preventing the occurrence of disconnection even when the compensating conductor is bent during use.

[0005]

A sheath type thermocouple according to a first aspect of the present invention connects a thermocouple element wire of a sheath element portion and a core wire covered with a covering material of a flat compensation wire. In a sheath-type thermocouple having a structure in which the sheath element portion including the connection portion and the portion of the compensation wire are covered with an adapter member, a fixing bracket for fixing the element wire of the compensation wire is provided in the adapter member. The present invention is characterized in that it is attached to the located compensating conductor portion, and the covering material of the compensating conductor and the core wire are caulked and fixed.

A sheath type thermocouple according to a second aspect of the present invention connects the thermocouple element wire of the sheath element portion and the core wire covered with the covering material of the flat compensation wire, and includes these connection portions. In a sheath-type thermocouple having a structure in which a sheath element portion and a portion of the compensation wire are covered with an adapter member, an end of the adapter member located on the compensation wire side is crimped to the compensation wire. It is a feature.

[0007] According to the sheath type thermocouple according to the first aspect of the present invention, by attaching a fixing bracket to the compensating conductor portion located in the adapter member, the covering material of the compensating conductor and the core wire. And can be fixed by caulking, even if the compensating conductor is bent during use,
The core of the compensating lead can be fixed without moving. That is, of the two core wires of the compensating lead wire, the core wire located outside the bending radius can be prevented from being pulled. As a result, it is possible to prevent the occurrence of disconnection at the connection between the core wire and the thermocouple wire of the sheath element portion due to the tension of the core wire of the compensating lead wire.

Further, according to the sheath type thermocouple according to the second aspect of the present invention, the end of the adapter member located on the compensating conductor side is caulked to the compensating conductor to thereby form the adapter end. Since the core of the compensating conductor can be fixed to the covering material at the portion, the core of the compensating conductor can be fixed even if the compensating conductor is bent during use. That is, of the two core wires of the compensating lead wire, the core wire located outside the bend R can be prevented from being pulled. As a result, it is possible to prevent the occurrence of disconnection at the connection between the core wire and the thermocouple wire of the sheath element portion due to the tension of the core wire of the compensating lead wire.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Embodiment 1) FIG. 1 is a partial sectional view of a sheath type thermocouple according to Embodiment 1 of the present invention.

[0010] The sheath element 11 is a thermocouple element wire 1.
It has 2,12. The flat compensating lead 13 is composed of two core wires 1
4 and 14 are covered with a covering material 15. The thermocouple wires 12 of the sheath element portion 11 are connected to the core wires 14 at one end of the flat compensation lead 13 by brazing or welding. A crimp terminal 15 is attached to each of the core wires 14 at the other end of the compensating lead 13. The cylindrical adapter member 16 is attached to a portion including a connection between the sheath element 11 and the compensating lead 13. A fixing material 17 such as epoxy resin, inorganic cement, or silicone rubber is filled inside the adapter member 16.

A flat cylindrical fixing member 18 is inserted into the compensating lead 13 located in the adapter member 16 and fixed by caulking. In the sheath-type thermocouple having such a structure, the pair of crimp terminals 15 is attached to the detection unit side, and the sheath element unit 11 is inserted into the detection unit side.
When the sheath-type thermocouple is used, the compensation lead 1
Even if the wire 3 is bent, the compensating lead 13 is caulked and fixed by the fixing bracket 18 at a portion located in the adapter member 16.
Can be fixed without moving. That is, even if the compensating lead 13 is bent, as shown in FIG.
3 of the two core wires 14, 14 located outside the bending radius are pulled.
8 can prevent this. As a result, it is possible to prevent the occurrence of disconnection at the connection portion between the core wires 14, 14 and the thermocouple wires 12, 12 of the sheath element portion 11 due to the tension of the core wire of the compensating lead wire 13.

Therefore, a highly reliable sheath-type thermocouple can be realized. (Embodiment 2) FIG. 3 is a partial sectional view of a sheath type thermocouple according to Embodiment 2 of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and the description is omitted.

The sheath-type thermocouple of the second embodiment has a compensating lead 1
An end 19 of the adapter member 16 located on the third side is caulked to the compensating lead 13. According to the sheath-type thermocouple having such a structure, even when the compensating lead 13 is bent during use, the compensating lead 13 is fixed by caulking the end portion 19 of the adapter member 16. The core wires 14, 14 of the compensating lead 13 can be fixed without moving. That is, even if the compensating lead 13 is bent, the two cores 14 and 1 of the compensating lead 13 are formed.
4, the core wires 14, 14 located outside the bending radius can be prevented from being pulled. As a result, the compensation lead 1
Disconnection at the connection between the core wires 14, 14 and the thermocouple wires 12, 12 of the sheath element portion 11 due to the tension of the core wire 3 can be prevented.
Therefore, a highly reliable sheath-type thermocouple can be realized.

[0014]

As described above in detail, according to the present invention, it is possible to provide a sheath-type thermocouple capable of preventing disconnection even when the compensating conductor is bent during use.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a sheath-type thermocouple according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view for explaining the operation of the sheath-type thermocouple of FIG.

FIG. 3 is a partial cross-sectional view showing a sheath-type thermocouple according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a conventional sheath-type thermocouple.

FIG. 5 is a partial cross-sectional view for explaining a problem of the sheath-type thermocouple of FIG. 4;

[Explanation of symbols]

 11 ... sheath element part, 12 ... thermocouple element wire, 13 ... flat compensation wire, 14 ... core wire, 16 ... adapter member, 18 ... fixing bracket, 19 ... End of the adapter member.

Claims (2)

[Claims] 1. A thermocouple element of a sheath element portion is connected to a core wire covered with a covering material of a flat compensation wire, and a portion of the sheath element portion and the compensation wire including these connection portions is an adapter member. In a sheath-type thermocouple having a structure covered with, a fixing bracket for fixing a wire of the compensation conductor is attached to the compensation conductor portion located in the adapter member, and the covering material of the compensation conductor and A sheath-type thermocouple characterized by caulking and fixing a core wire. 2. A thermocouple wire of a sheath element portion and a core wire covered with a covering material of a flat compensation wire are connected to each other, and a portion of the sheath element portion and the compensation wire including these connection portions is connected to an adapter member. In a sheath-type thermocouple having a structure covered with, the end of the adapter member located on the compensation lead wire side,
A sheath-type thermocouple, which is caulked to the compensating conductor.