JPH10185702A - Thermocouple type temperature measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermocouple-type temperature measuring apparatus whose responsivity is enhanced by a method wherein a metal powder for heat conduction is filled into a part between a sheath used to house a thermocouple body and a well used to protect the sheath and the conduction of heat is promoted from a part between a temperature measuring junction point and the side face of the well. SOLUTION: Tips of two kinds of metal wires 12, 13 are joined so as to form a first junction point 14, ends on the other side of both wires are joined so as to form a closed circuit having a second reference junction point and a third reference junction point, and a thermocouple body 15 is constituted. The thermocouple body 15 is housed in a housing pipe at a sheath 16, a gap is provided on the other side of the sheath, and the thermocouple body is protected by a protective pipe at a well 17. A highly heat-conductive material, e.g. a metal powder such as copper, silver, platinum or the like, is filled into a part between the well 17 and the sheath 16. The thermocouple body 15 keeps the temperature of the second and third junction points constant. When the junction point 14 for measurement is brought close to an object to be temperature-measured, the temperature of the junction point 14 is changed. A temperature is measured by making use of a thermoelectromotive force due to a temperature difference generated between the junction point 14 and the second and third junction points. In this manner, since the metal power 22 is interposed, a heat conduction route becomes shortest, and the responsivity of a thermocouple-type temperature measuring apparatus is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocouple type temperature measuring device. More specifically, the present invention relates to a thermocouple-type temperature measuring device capable of improving responsiveness by promoting heat transfer between a junction point for temperature measurement and a side surface of a well.

[0002]

2. Description of the Related Art In general, as shown in FIG. 5 and FIG. And the other ends of the metal wires 1 and 2 are respectively connected by conductors (not shown) to form a closed circuit having second and third connection points (reference connection points). When the temperature of the first junction 3 is changed while keeping the temperature of the point constant, a thermoelectromotive force due to a temperature difference generated between the first junction 3 and the second and third junctions is used. In this case, the temperature is measured.

The thermocouple is usually housed in a housing tube called a sheath 4 and further protected by a protection tube called a well 5 with a gap outside the sheath 4.

[0004] As shown in FIG.
An end cap 7 is fixed to the lower end of the hole by welding or the like. The well 5 is formed by drilling a drill hole 8 in a metal rod. The lower end of the end cap 7 is machined so that it can abut.

[0005]

However, the above-mentioned conventional thermocouple type temperature measuring device has the following problems.

That is, the temperature change at the first junction 3 is largely due to the heat transmitted from the lower end of the well 5 to the end cap 7 of the sheath 4. The distance 10 between the first junction 3
(The distance 10 between the lower end of the well 5 and the first junction 3 is greater than the distance 11 between the first junction 3 and the side of the well 5). 11 is almost two to three times), so that the responsiveness was not sufficiently good.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a thermocouple-type temperature measuring device capable of improving responsiveness by promoting heat transfer between a junction for temperature measurement and a side surface of a well. It is intended to provide.

[0008]

The first means of the present invention is as follows.
The present invention relates to a thermocouple-type temperature measuring device characterized in that a metal powder 22 for heat transfer is filled between a sheath 16 for housing a thermocouple body 15 and a well 17 for protecting the sheath 16.

The second means of the present invention comprises a sheath 16 for accommodating a thermocouple main body 15 and a well 1 for protecting the sheath 16.
7. A thermocouple-type temperature measuring device characterized in that a heat transfer promoting piece 23 for bringing the sheath 16 and the well 17 into contact with each other is interposed at a side position of the temperature measuring junction 14 between Such is the case.

A third means of the present invention is to form a bent portion 24 on the side of the junction 16 for temperature measurement in the sheath 16 accommodating the thermocouple main body 15 or in the vicinity thereof, so as to measure the temperature of the sheath 16. The thermocouple-type temperature measuring device according to the present invention is characterized in that a side portion of the junction 14 is brought into direct contact with a well 17 for protecting a sheath 16.

A fourth means of the present invention is to form a tapered narrowed portion 25 at the lower end of a well 17 for protecting a sheath 16,
According to a thermocouple-type temperature measuring device, the side of the junction for temperature measurement 14 of the sheath 16 accommodating the thermocouple main body 15 is brought into direct contact with the inner surface of the tapered narrowed portion 25 of the well 17. Things.

According to the first means of the present invention, the metal powder 22 for heat transfer is filled between the well 17 and the sheath 16. From the side, the temperature is changed by the heat transmitted through the metal powder 22 for heat transfer, and the responsiveness can be improved by the shortest heat transfer path.

In the second means of the present invention, the temperature measuring joint 14 between the well 17 and the sheath 16 is located at a side portion thereof.
Since the heat transfer promoting piece 23 for bringing the sheath 16 and the well 17 into contact with each other is interposed, the temperature measurement
The temperature is changed by the heat transmitted from the side surface of the well 17 via the heat transfer promoting piece 23, and the responsiveness can be improved by the shortest heat transfer path.

In the third means of the present invention, a bent portion 24 is formed at or near the side of the temperature measuring junction 14 in the sheath 16 so that the side of the temperature measuring junction 14 of the sheath 16 is formed. Since the contact is made to come into direct contact with the well 17, the temperature of the junction 14 for temperature measurement is changed by the heat transmitted from the side surface of the well 17 through the bent portion 24 of the sheath 16. Responsiveness can be increased by the shortest route.

In the fourth means of the present invention, a tapered narrowed portion 25 is formed at the lower end of the well 17 so that the side of the temperature measuring junction 14 of the sheath 16 is tapered.
The temperature measurement junction 14 is changed in temperature by the heat transmitted from the tapered constricted portion 25 of the well 17 via the sheath 16, and the heat transfer path Is the shortest, the responsiveness can be improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention.

The two types of metal wires 12 and 13 are joined together by welding or the like to form a first junction 14 (a junction for temperature measurement, hereinafter referred to as a junction 14 for temperature measurement). The other ends of the terminals 12 and 13 are connected by conducting wires (not shown) to form a closed circuit having second and third connection points (reference connection points), thereby forming the thermocouple body 15.

The thermocouple main body 15 is housed in a housing tube called a sheath 16 and further protected by a protection tube called a well 17 with a gap outside the sheath 16.

The sheath 16 is formed by fixing an end cap 19 to the lower end of a tube 18 by welding or the like. The lower end of the end cap 19 is machined so that it can contact the conical portion 21 of the end cap 19.

In the present invention, the metal powder 22 for heat transfer is filled between the well 17 and the sheath 16.

The metal powder 22 may be any material having a high thermal conductivity, for example, copper, silver, platinum or the like.

When the sheath 16 is installed vertically downward, the metal powder 22 for heat transfer may be filled up to a position on the side of the junction 14 for temperature measurement. If you want to turn or tilt 16 horizontally,
The metal powder 22 for heat transfer needs to be filled in the entire space between the sheath 16 and the well 17.

Next, the operation will be described.

The thermocouple body 15 keeps the temperature of the second and third junctions constant, and brings the temperature measurement junction 14 closer to the object to be measured by bringing the temperature measurement junction 14 closer to the object to be measured. At this time, the junction 14 for temperature measurement and the second
The temperature is measured using a thermoelectromotive force due to a temperature difference generated between the third junction and the third junction.

According to the present invention, the metal powder 22 for heat transfer is filled between the well 17 and the sheath 16. The temperature is changed by the heat transmitted through the metal powder 22 for use, and the responsiveness can be improved by the shortest heat transfer path.

FIG. 2 shows a second embodiment of the present invention, in which a heat transfer promoting piece 23 for bringing the sheath 16 into contact with the well 17 is interposed between the well 17 and the sheath 16. Things.

The heat transfer promoting piece 23 is welded and fixed to, for example, a side position of the joint 14 for temperature measurement in the sheath 16.

Also in this case, the junction 14 for temperature measurement is used.
The temperature is changed by the heat transmitted from the side surface of the well 17 via the heat transfer promoting piece 23, and the responsiveness can be improved by the shortest heat transfer path.

Except for the above, it has the same configuration as that of the above embodiment, and can obtain the same operation and effect.

FIG. 3 shows a third embodiment of the present invention, in which a bent portion 24 is formed on the side of the joint 16 for temperature measurement in the sheath 16 or in the vicinity thereof, so that the temperature of the sheath 16 can be measured. The side portion of the joining point 14 is brought into direct contact with the well 17.

In this case as well, the junction 14 for temperature measurement is used.
The temperature is changed by the heat transmitted from the side surface of the well 17 through the bent portion 24 of the sheath 16, and the responsiveness can be improved by the shortest heat transfer path.

Except for the above, it has the same configuration as that of the above embodiment, and can obtain the same operation and effect.

FIG. 4 shows a fourth embodiment of the present invention, in which a tapered narrowed portion 25 is formed at the lower end of a well 17.
The side of the joint 16 for temperature measurement of the sheath 16 is
Is made to directly contact the inner surface of the tapered narrowed portion 25.

Even in this case, the junction 14 for temperature measurement is used.
The temperature is changed by the heat transmitted from the tapered constricted portion 25 of the well 17 via the sheath 16, and the responsiveness can be improved by the shortest heat transfer path.

In the figure, as the well 17, a tube having a closed lower end is used instead of a metal rod having a drilled hole.

Except for the above, the present embodiment has the same configuration as that of the above-described embodiment, and the same operation and effect can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the present invention.

[0039]

As described above, according to the thermocouple type temperature measuring device of the present invention, the responsiveness is improved by promoting the heat transfer from between the temperature measuring junction and the side surface of the well. It is possible to achieve an excellent effect of being able to do so.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of a first embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a second embodiment of the present invention.

FIG. 3 is a partially enlarged sectional view of a third embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view of a fourth embodiment of the present invention.

FIG. 5 is a schematic overall side view of a conventional example.

FIG. 6 is a partially enlarged sectional view of FIG. 5;

[Explanation of symbols]

 12 Metal Wire 13 Metal Wire 14 Junction Point (Junction Point for Temperature Measurement) 15 Thermocouple Body 16 Sheath 17 Well 22 Metal Powder 23 Heat Transfer Enhancement Piece 24 Bent Section 25 Tapered Narrow Section

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takushi Terakuku 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries, Ltd. Inside the Yokohama Engineering Center (72) Inventor Katsuhiko Runningo Yokohama-shi, Kanagawa No. 1 Shin-Nakahara-cho, Isogo-ku Ishi Kawashima-Harima Heavy Industries, Ltd. Yokohama Engineering Center

Claims (4)

[Claims] 1. A sheath (16) for housing a thermocouple body (15) and a well (17) for protecting the sheath (16).
And a metal powder for heat transfer (22). 2. A sheath (16) for containing a thermocouple body (15) and a well (17) for protecting the sheath (16).
A heat transfer promoting piece (23) for bringing the sheath (16) into contact with the well (17) is interposed at a side position of the temperature measuring junction (14) between the heat transfer piece and the well (17). Thermocouple type temperature measuring device. 3. A bent portion (24) is formed at or near a side of the junction for temperature measurement (14) in a sheath (16) accommodating the thermocouple body (15), and the sheath (16) is formed.
A thermocouple-type temperature measuring device, wherein a side portion of the temperature measuring junction (14) is brought into direct contact with a well (17) for protecting the sheath (16). 4. A well (1) for protecting a sheath (16).
7) forming a tapered narrow portion (25) at the lower end, and forming a side portion of a junction (14) for temperature measurement of a sheath (16) accommodating the thermocouple body (15) into a tapered shape of a well (17). A thermocouple-type temperature measuring device, wherein the thermocouple-type temperature measuring device is brought into direct contact with the inner surface of the throttle portion (25).