JP2579095Y2 - thermocouple - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocouple used for a gas cooking device, a safety device for extinguishing a gas water heater, and the like.

[0002]

2. Description of the Related Art A conventional thermocouple 1 of this type will be described with reference to FIGS. A round thermocouple core wire 12 extended and connected to a pair of different linear thermocouple materials 11 and a cylindrical thermocouple material 13, respectively, and a thermocouple cylinder 14 are also substantially concentrically arranged inside and outside. I have. When this type of thermocouple 1 is attached to the instrument body, etc., there is a possibility that the round core wire 12 may apply a rotating power to the round thermocouple cylinder 14,
Thus, a round thermocouple material 11 and a cylindrical thermocouple material 13
In some cases, a considerable torsional stress is generated in the vicinity of the welded joint between the steel and the torsion, resulting in a problem.

FIG. 9 shows a thermocouple in which a different thermocouple material 11 ′ is interposed between the thermocouple material 11 and the thermocouple core wire 12. In this embodiment, the above-mentioned welding connection is similarly performed. A considerable torsional stress may occur near the part.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the occurrence of the above-mentioned torsional stress and prevent the thermocouple from being broken.

[0005]

According to the present invention, a wide portion and a flat wide portion are respectively formed on a thermocouple core wire 12 and a thermocouple cylinder 14 which are extended and connected to a thermocouple material. A thermocouple in which a pair of thermocouples are arranged concentrically inside and outside and welded and joined at their distal ends, and a thermocouple core wire and a thermocouple cylinder are connected to their respective base ends, A wide portion including an eccentric portion is formed in the thermocouple core wire, and a flat wide portion corresponding to the wide portion is formed in the thermocouple cylinder to form a thermocouple.

[0006]

The wide portion 121 of the thermocouple core wire 12 is constrained by the wide portion 141 of the thermocouple cylinder 14 so that the thermocouple core wire 12 does not rotate relative to the thermocouple cylinder 14, and the thermoelectric core 12 does not rotate. No torsional stress is generated in the material 11.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a thermocouple in which a linear thermocouple material 11 and a cylindrical thermocouple material 13 are concentrically arranged inside and outside, respectively, and a tip is welded to form a hot junction at the tip. A thermocouple core wire 12 and a thermocouple cylinder 14 are concentrically joined to each other at a base end of each of the thermocouple material 11 and the thermocouple material 13 at a base end by welding with a gap therebetween. The use cylinder 15 is interposed. The thermocouple core wire 12 having a diameter r is bent so as to protrude rightward in FIG. 1 at a position near the base end, and is decentered in the XX section in FIG. And an eccentric wide portion 121a is formed. On the other hand, the thermocouple cylindrical body 14 has a shape substantially matching the wide part 121a, and has a flat wide part 141 having a slightly larger inner diameter by press working in the direction of the arrow a.
Is formed near the base end, and the thermocouple core wire 12 is inserted and fitted into the thermocouple cylinder 14 to fit the wide portion 121 a into the wide portion 141. In this embodiment, the crushing process may be performed separately on the thermocouple cylinder 14 and the thermocouple core wire 12. Thus, the wide portion 121a is prevented from rotating by the wide portion 141 of the thermocouple cylinder 14.

Next, in FIG. 3, the vicinity of the base end of the thermocouple cylinder 14 is crushed by pressing or the like in the direction of arrow a in FIG. An oval shape having a wide portion 141 having a width t2 larger than the diameter r, and the thermocouple core wire 12 also having a wide portion 121b having a width t2 larger than r in the left-right direction via the insulating material 15. It is molded into. In this embodiment, the crushing process may be performed separately on the thermocouple cylinder 14 and the thermocouple core wire 12. Thus wide part 1
21b is prevented from rotating by the wide portion 141 of the thermocouple cylinder 14.

Next, the embodiment shown in FIGS. 5 and 6 is a case where a different thermocouple material 11 ′ is connected by welding to the base end side of the thermocouple material 11, and the thermocouple material is connected at the junction. A type in which a so-called secondary thermocouple that generates an electromotive force having a polarity opposite to that of the thermoelectromotive force generated between the pair of materials 11 and 13 is interposed, and the same parts as those in FIGS. The other components are the same as those shown in FIGS. Thus, the rotation is prevented by the wide portion 141 substantially matching the wide portion 121b, and the object of the present invention is achieved.

[0010]

As described above, in the thermocouple according to the present invention, in the thermocouple core wire, the wide portion 121 of the core wire coincides with the wide portion 141 of the thermocouple cylinder 14 to form the thermocouple cylinder 14. Because it is constrained, relative rotation between the thermocouple material, the thermocouple core wire, and the thermocouple cylinder is impossible, and there is no danger of torsional stress occurring in any part of the thermocouple. , Which is effective without causing torsional breakage.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a thermocouple according to the present invention.

FIG. 2 is a sectional view taken along line XX of the embodiment of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view taken along line YY of the embodiment in FIG. 3;

FIG. 5 is a longitudinal sectional view showing an embodiment partially different from FIG. 1;

FIG. 6 is a longitudinal sectional view showing an embodiment partially different from FIG. 3;

FIG. 7 is a longitudinal sectional view showing a conventional example.

FIG. 8 is a cross-sectional view of FIG.

FIG. 9 is a longitudinal sectional view showing an embodiment partially different from FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermocouple 11 Thermocouple material 11 'Thermocouple material 12 Core wire for thermocouple 121 Wide part 13 Material for thermocouple 14 Thermocouple cylinder 141 Wide part

Claims (1)

(57) [Scope of request for utility model registration] 1. A thermocouple in which a pair of thermocouples are concentrically arranged inside and outside and welded and joined at their distal ends, and a thermocouple core wire and a thermocouple cylinder are connected to respective base ends. A thermocouple, wherein a wide portion including an eccentric portion is formed in the thermocouple core wire, and a flat wide portion corresponding to the wide portion is formed in the thermocouple cylinder.