JPH0431723A - Temperature-difference measuring device utilizing sheathed thermocouple - Google Patents

Abstract

PURPOSE:To measure a temperature difference simply by applying the tips of two sheathed thermocouples on the upper and rear surfaces of a metal plate. CONSTITUTION:When thermal conductivity from the upper surface to the rear surface of a metal plate is measured, it is necessary to measure the temperature difference between the upper and rear surfaces of the metal plate. At this time, a temperature detecting part 14 of a sheath 11 of a temperature-difference measuring device is applied on the upper surface of the metal plate, and a temperature detecting part 18 of a sheath 15 is applied on the rear surface of the metal plate. The super electric powers which are measured with the respective temperature measuring devices parts 14 and 18 are offset. The super electric power which is measured across both ends of a compensating conductor wire 20 becomes the super electric power corresponding to the temperature difference between the upper and rear surfaces of the metal plate.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a device that measures temperature differences using thermocouples, and more particularly, to a device that uses thermocouples to measure temperature differences, and moreover, to high precision by incorporating two or more thermocouples into one sheath. The present invention relates to a temperature difference measuring device for measuring temperature differences.

(Prior Art) Sheathed thermocouples have a simple structure and are easy to use, so they have been widely used in the past.

In the sheathed thermocouple, for example, as shown in FIG. 3, a metal wire 2 made of copper and a metal 411i3 made of funstantan are connected in a sheath 1 at a contact 4, and the temperature of the metal wire 2 is determined by the temperature of the contact 4. Temperature is measured by taking advantage of the fact that the electromotive force (■) generated between .3 and 3 is different. Normally, the zero temperature contact 5.52 is immersed in the decoubin 6 for zero temperature adjustment.

When calculating the heat flux flowing through a metal plate, the temperature difference between the front and back sides of the metal plate is detected.

Conventionally, when measuring the temperature difference between the front and back surfaces of a metal plate using sheath type thermocouples, as shown in FIG. Currently, this is done by measuring each temperature and calculating the difference.

(Problems to be Solved by the Invention) However, in the conventionally known temperature difference measurement method, the temperatures on the front and back sides of the metal plate 9 are measured separately and the difference is calculated, so the workability is poor (, It was time-consuming.

In addition, conventionally known sheathed thermocouples measure temperature with only one contact point, and therefore are insufficient in measurement accuracy.

Furthermore, conventional thermocouples using sheathed thermocouples require dewar pins and ice for zero temperature adjustment.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a temperature difference measuring device that can easily measure temperature differences using conventionally known sheathed thermocouples and has improved measurement accuracy.

(Means for solving the problem) Of the present invention! Where I is used, two sheath type thermocouples are provided with a thermocouple inside the sheath, and the metal wires of both sheath type thermocouples are connected with the polarity of the electromotive force reversed to form one connection part. The temperature difference is measured by connecting both ends of the side thermocouple to a compensating conductor and measuring the electromotive force. A plurality of thermocouples are provided in each of the two thermocouples, and the thermocouples in one sheath and the thermocouples in the other sheath are connected alternately with opposite polarity. It's about to happen.

(Function) In the temperature difference measurement of the present invention, when the tips of two sheathed thermocouples are applied to the front and back of the metal plate surface, an electromotive force corresponding to the temperature difference is generated at both ends of the compensating conductor, so it is easy to measure. It is capable of measuring temperature differences.

(Example) Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic sectional view of a temperature difference measuring device according to an embodiment of the present invention.

In the figure, in one sheath 11, a metal wire 12 made of copper and a metal wire 13 made of funstantan are connected at a temperature detection section 14 at the tip, and one thermocouple is configured.

Inside the other sheath 15, a metal wire 16 made of copper and a metal wire 17 made of funstantan are connected to a temperature detection section 18 at the tip.
The two thermocouples are connected to each other to form the other thermocouple.

Both sheaths 11.15 are attached to one connection 19. Inside the connecting portion 19, metal #13 made of funstantan of the sheath 11 and metal #117 made of funstantan of the sheath 14 are connected, thereby connecting the two sets of thermocouples with opposite polarities. It has become a thing.

Among the thermocouples connected with opposite polarity, metal llAl
Both ends of 2 and metal @16 are connected to the compensation conductor 1i120, and the electromotive force (2) is measured at the ends.

As mentioned above, since the sheath 11 and the sheath 15 are connected with opposite polarity, the electromotive force V generated between them is
This is the difference between the electromotive force generated in the temperature detection section 14 of the sheath 11 and the electromotive force generated in the temperature detection section 18 of the sheath 15.

The operation of the temperature difference measuring device according to an embodiment of the present invention will be explained below.

For example, when trying to measure heat conduction from the front side of a metal plate to the back side, it is necessary to measure the temperature difference between the front and back sides of the metal plate.

In such a case, the sheath 1 of the temperature difference measuring device according to the present invention
The temperature detection unit 14 of No. 1 is applied to the surface of the metal plate, and the sheath 15
The temperature detection unit 18 is placed on the back surface of the metal plate. The electromotive force measured by each temperature detection unit 14.18 is canceled out,
The electromotive force measured at both ends of the compensation conducting wire 20 corresponds to the temperature difference between the front and back sides of the metal plate.

FIG. 2 is a schematic sectional view showing another embodiment of the present invention.

In the figure, inside one sheath 21 are two metal wires 22 made of copper. ．． Two metal wires 238.22□ and Funstantan are connected to the temperature detection part 24.23□ at the tip. 2
They are connected at 42, thereby forming one composite thermocouple.

There are also two metal wires 2 made of copper inside the other sheath 25.
Two metals 1i consisting of 62.262 and funstantan
27. ．． 27□ are connected to each other at the temperature detecting portions 28+ and 28□ at the tip, thereby forming the other composite thermocouple.

Both sheaths 21.25 are attached to one connection 29. Inside the connecting portion 29, the composite thermocouple of the sheath 21 and the composite thermocouple of the sheath 25 connect to their respective temperature sensing portions 24. 24□ and temperature detection section 28
4.28□ are connected in series so that the polarity of the electromotive force generated is opposite. That is, the sheath 21 is a metal made of constantan [23, and the sheath 25 is made of a metal l527. The metal wire 232 made of copper of the sheath 25 and the metal wire 222 made of copper of the sheath 21 are connected, and the metal wire 232 made of the constantan of the sheath 21 and the metal wire 232 made of constantan of the sheath 25 It is connected to the metal wire 27□.

Among the composite thermocouples connected in series with reversed polarity, metal@22. and metal #! Both ends of 26□ are compensation conductors #i
30, and the electromotive force ■ is measured at both ends.

As mentioned above, the composite thermocouples of the sheath 21 and the sheath 25 are connected with opposite polarities, so the electromotive force ■ generated between the two is generated at the temperature detection part 24 and 24□ of the sheath 21. Electromotive force and temperature detection section 28□ of sheath 25, 282
This is the difference between the electromotive force generated in

In the configuration of other embodiments of the present invention described above,
Since two sets of temperature detection units represented by composite thermocouples are provided, the accuracy of the measured temperature is improved.

The above is one embodiment of the present invention, and the present invention is not limited to the above embodiment.

In particular, the number of composite thermocouples installed in the sheath is not limited to two, and the measurement accuracy improves as the number increases, so it is recommended to set three or more pairs to further improve the measurement accuracy. It is desirable to do so.

Furthermore, the materials constituting the thermocouple are not limited to the combination of copper and finstantan, but may also include combinations of materials constituting other known thermocouples.

(Effects of the Invention) The effects of the present invention, which is configured and operated as described above, are as follows.

Since the temperature difference can be easily measured, for example, when measuring the heat flux between the front and back sides of metal, the heat flux can be measured with one touch.

Since temperature is detected by multiple temperature detection sections, measurement accuracy is improved.

The structure is simple and the cost is low.

Since there is no need for a zero contact, there is no need for a dewarbin or ice as in the past.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention, FIG. 2 is a schematic sectional view showing another embodiment of the invention, FIG. 3 is a sectional view showing a conventionally known sheath type electric lamp, and FIG. FIG. 4 is a diagram showing a measurement method when measuring the heat flux of a metal plate using a conventional thermocouple. 1: Sheath 12: Metal 1i 13: Metal wire 4: Temperature detection part 15: Sheath 16: Metal wire 7: Metal wire 18
: Temperature detection section 19: Connection section 0: Compensation lead 1i 21:
Sheath 28.22□: Metal wire 23. 232: Metal wire 41
242: Temperature detection section 25: Sheath 6, 26□: Metal wire 271.27□: Metal wire 812B2: Temperature detection section 2
9: Connection part o: 1 compensation conductor diagram diagram diagram diagram diagram diagram diagram 4

Claims (2)

[Claims] (1) Two sheath-type thermocouples are provided, each with a thermocouple inside the sheath, and the metal wires of both sheath-type thermocouples are connected in series with the polarity of the electromotive force reversed to form a single connection. 1. A temperature difference measuring device using a sheath type thermocouple, characterized in that the temperature difference is measured by integrating both ends of the thermocouple with a compensating conductor and measuring an electromotive force. (2) Two sheath type thermocouples each having a thermocouple inside the sheath are provided, each of the two thermocouples has a plurality of thermocouples, and one thermocouple inside one sheath. 1. A temperature difference measuring instrument using a sheathed thermocouple, characterized in that the thermocouple and one thermocouple in the other sheath are connected in series with alternate polarity.