JPH04102439U - Temperature measurement device using thermocouple - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the contact area with the test piece to enable accurate temperature measurement. [Structure] The thermocouple is in the form of a thin strip. Join the positive and negative ends of the thermocouple by butting them together or overlapping them. This joint is brought into contact with the surface of the test piece. Since the area in contact with the test piece is large, the accuracy of temperature measurement on the surface of the test piece can be improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention provides temperature control for material strength tests such as tensile, creep, fatigue, etc. at high temperatures. This invention relates to a temperature measuring device using a thermocouple used for rolls.

0002

[Conventional technology]

In this type of material strength test, the specimen is exposed to a certain temperature, for example as high as 550°C. When testing at high temperatures, the test piece must also be at the same temperature. To find out the temperature of the test piece, calculate the surface temperature of the above test piece. It is necessary to measure accurately. The temperature of such test pieces has traditionally been measured using thermocouples. This is done using

0003 The traditional way to measure the temperature of a specimen using a thermocouple is to use a wire thermocouple. Join the positive and negative tips of the pair, and connect the joint to the surface of the test piece. The temperature changes depending on the difference in thermoelectromotive force of different metals on the positive and negative sides. I try to measure it.

0004

[Problem that the idea aims to solve]

However, in the conventional test piece temperature measurement method using thermocouples, the temperature of the thermocouple is The joint point is brought into contact with the test piece, but since the contact part with the test piece is a point, the contact area is There is a problem in that the temperature is small and a potential difference occurs, making accurate temperature measurement impossible.

[0005] Therefore, the present invention increases the area in contact with the test piece to reduce the voltage drop at the contact surface. Improves temperature measurement accuracy with thermocouples by allowing accurate temperature measurements It is an attempt to do so.

[0006]

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has developed a thin strip-shaped thermocouple at the positive end. Butt the end and the minus side tip and join the abutting surfaces, or , overlap the sides of the positive side tip and the negative side tip and join them. The structure is such that the joint is in contact with the surface of the test piece.

[0007]

[Effect]

The junction between the positive and negative sides of the thermocouple is wide with surface contact. Since it is brought into contact with the test piece, the area that comes into contact with the test piece is large. Therefore, the difference between the test piece and The voltage loss at the contact surface is small, and the temperature on the surface of the test piece can be measured with high accuracy. Ru. Also, the junction between the positive and negative sides of the thermocouple should not overlap in the thickness direction. Since there are no gaps, there will be no steps at the joints.

[0008]

【Example】

Embodiments of the present invention will be described below based on the drawings.

[0009] Figure 1 shows an embodiment of the present invention, in which two different metals are joined to form a joint. Temperature measurement using a thermocouple that measures the temperature of the test piece by bringing it into contact with the test piece In the device, the positive side 1 of the thermocouple and the micro side of the thermocouple, which are two different metals, are connected. Make the eggplant side 2 into a thin strip shape, and line up the tips 1a and 2a in the width direction and attach the sides. Place them in contact with each other and spot weld 4 at several points along the contact line 3 to join them. Then, connect the plus side 1 and minus side 2 of the joined thermocouple around the round rod-shaped test piece 6. so that the joint part 5 comes into contact with the test piece 6.

0010 The thermoelectromotive force between the metal on the positive side 1 and the metal on the negative side 2 of the thermocouple is the temperature at the junction 5. The surface temperature of the test piece 6 is measured using the fact that In the present invention, the joint part 5 is wide and the contact area with the test piece 6 is large, so the contact surface is It is possible to reduce the voltage drop and accurately measure the temperature on the surface of the test piece 6. becomes. In addition, the joint 5 is made by attaching the metal on the positive side 1 and the metal on the negative side 2 in the width direction. Since they are folded together and joined at the same height, there is no problem in the overlap when stacking in the thickness direction. There is no risk of a step forming.

[0011] Next, FIG. 2 shows another embodiment of the present invention, in which the tip surface of the positive side 1 of the thermocouple is and the tip surface of the minus side 2 and make contact, and the contact line 3 is spot welded 4. It is designed so that they can be joined together.

0012 In this example as well, the joint 5 formed by spot welding 4 is brought into contact with the test piece 6. This makes it possible to increase the area in contact with the test piece 6 and accurately measure the temperature of the test piece 6. can do.

[0013] It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. In this case, cut the tip of the positive side 1 and the tip of the negative side 2 of the thermocouple at right angles. This example shows the case of joining by butting each other, but the end faces of each should be aligned at the required angle. You can also cut it diagonally and join it by touching the cut side from the side. Of course, various other changes may be made without departing from the gist of the invention. It is a theory.

[0014]

[Effect of the idea]

As described above, according to the temperature measuring device using a thermocouple of the present invention, two different kinds of The positive side and negative side of the thermocouple, which are genus, are each made into thin strips. Abut the tip surfaces against each other, or place the tips side by side and abut the sides. , join the contact line, and touch the test piece by running the joint part around the test piece. Since the temperature on the surface of the test piece is measured, the area in contact with the test piece is increased. The voltage drop at the contact surface can be reduced, and the temperature on the surface of the test piece can be reduced. Measurement accuracy can be further improved, and the positive and negative sides of the thermocouple can be The joints are not overlapped in the thickness direction, but the end surfaces are butted or the joints are overlapped in the width direction. Because it is a superposition of two layers, it has excellent effects such as no steps being formed at the joint. It is possible.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

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

[Explanation of symbols]

1 Positive side of thermocouple 2 Negative side of thermocouple 1a, 2a Tip 3 Contact line 4 Spot welding 5 Joint part 6 Test piece

Claims (2)

[Scope of utility model registration request] [Claim 1] The positive and negative sides of thermocouples made of two different metals are each made into thin strips, and the positive and negative tips are arranged side by side and the sides are brought into contact with each other. 1. A temperature measuring device using a thermocouple, characterized in that the thermocouple is connected to the test piece, and the joined portion is brought into contact with the surface of the test piece along the surface of the test piece. 2. The thermocouple temperature measuring device according to claim 1, wherein the joining portion is formed by bringing the positive end and the negative end of the thermocouple into butt contact.