JPH102805A - Bonding type surface temperature measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure temperature of a metal made object to be measured in a bonding type surface temperature measuring device within a wide range accurately by reducing measured error in a high temperature area. SOLUTION: A thermocouple 5 is held between a part where a pair of insulating tapes 1, 3 are bounded through an adhesive layer 7. The adhesive layer 7 is partially exposed by removing one of the insulating tapes 3 at vicinity of a conjugating part 5a of the thermocouple 5 to form a metal layer 15 of determined area such that it is interposed on the conjugating part 5a at a rear side of the other insulating tape 1. Whereby, the vicinity of the conjugating part 5a of the thermocouple 5 is almost arranged in the object to be measured and temperature measuring error may be reduced in a high temperature area as well as in a low temperature area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sticking type surface temperature measuring device using a thermocouple, and more particularly to a sticking type surface temperature measuring device which is brought into contact with a surface of an object to be measured made of a metallic material to measure the surface temperature. It relates to improvement of the device.

[0002]

2. Description of the Related Art Conventionally, as this type of a sticking type surface temperature measuring device, for example, a configuration as shown in Japanese Utility Model Publication No. 55-13694 has been proposed. That is, as shown in FIGS. 6 and 7, a pair of insulating tapes 1 and 3 are attached to each other to hold the thermocouple 5 therebetween, and the tip of the tape 3 is shifted with respect to the tip of the tape 1. While exposing the adhesive layer 7 on the tape 1 together with the vicinity of the junction 5a of the thermocouple 5, the terminal plate 11 on which the connection electrode 9 is formed is sandwiched between the other ends of the tapes 1 and 3, and the wires of the thermocouple 5 are formed. 5b is connected to the connection electrodes 9. 6, the illustration of the adhesive layer 7 is omitted, and the illustration of the thermocouple 5 is omitted in FIG.

In such a measuring device, as shown in FIG. 8, the adhesive layer 7 at the leading end of the tape 1 is exposed together with the joint 5a of the thermocouple 5, so that as shown in FIG. The bonding portion 5a of the thermocouple 5 can be brought into direct contact with the DUT 13 by attaching the tip of the tape 1 to the surface of the tape 13 with the adhesive layer 7, and the electrical insulation of the insulating tapes 1 and 3 is good. And the heat capacity is small, and the junction 5 of the thermocouple 5
Since it is possible to minimize the heat conduction error by making a as close as possible to the surface of the DUT 13, it is considered that the measurement accuracy is relatively good and the measurement operation is simple.

[0004]

However, in the pasting type surface temperature measuring device described above, although the detected temperature error is relatively small in a low temperature range, the detected temperature of the DUT 13 becomes higher as the temperature becomes higher than 150 ° C. The error tends to increase. That is, the detected temperature tends to be lower than the actual value as the temperature becomes higher. This phenomenon is 1
It is considered that as the temperature becomes higher than 50 ° C., the amount of heat radiated from the surfaces of the insulating tapes 1 and 3 by heat radiation increases, so that the detection temperature decreases, and there is room for improvement.

Therefore, the present inventor has repeated various studies and experiments on the surface temperature state of an object to be measured made of a metal material, and as a result, completed the present invention.
The present invention has been made under such circumstances, and has a small temperature measurement error even in a high-temperature range, allows accurate temperature measurement over a wide range, and has a simple configuration for an object to be measured made of a metal material. It is intended to provide a surface temperature measuring device.

[0006]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention holds a thermocouple while bonding a pair of insulating tapes via an adhesive layer, and joins the thermocouple to a junction of the thermocouple. In the vicinity, one of the insulating tapes is removed to expose the thermocouple junction together with the adhesive layer, and a metal layer is formed on the back side of the other insulating tape so as to overlap the thermocouple junction. It is.

Further, the present invention provides a method for forming the above-mentioned metal layer having an area of not less than 3 mm ^{2 such} that its center part overlaps with the junction of the thermocouple, or the above-mentioned metal layer is made of the same kind as the object to be measured. It is good to form with a metal material.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are given to portions common to the conventional example.

FIGS. 1 and 2 are a plan view and a side view, respectively, showing an embodiment of a sticking type surface temperature measuring apparatus according to the present invention, and FIG. 3 is an enlarged bottom view of a main part thereof. In FIGS. 1 and 2, for example, elongated insulating tapes 1 and 3 obtained by subjecting a glass fiber to a silicone varnish treatment have an adhesive layer 7 formed on one side of each other. The adhesive layers 7 are adhered to each other with the K-type thermocouple 5 interposed therebetween so as to be integrally fixed, and the thermocouple 5 is held along the length between them.

At the junction 5a side of the thermocouple 5, the insulating tape 3 is staggered with respect to the insulating tape 1, and an adhesive layer 7 is provided at one end (left side in FIG. 1) of the insulating tape 1. At the same time, the junction 5a of the thermocouple 5 and its vicinity are fixed to the insulating tape 1 and exposed. That is, the insulating tape 1 is formed longer in the longitudinal direction than the insulating tape 3, and the other end (right side in FIG. 1) is aligned.
The insulating tape 1 protrudes from one end of the tape.

The adhesive layer 7 does not need to be formed on both of the insulating tapes 1 and 3, but may be formed on at least one surface of the longer insulating tape 1. Insulating tape 1, 3
Terminal plate 1 on which a pair of connection electrodes 9 are formed
1 is inserted, and the terminal plate 11 is fixed so as to be sandwiched by the insulating tapes 1 and 3.

The connecting electrodes 9 are connected to the wires 5 of the thermocouple 5.
The tip of b is soldered to enable external connection.
In the insulating tape 1 protruding from one end of the insulating tape 3, a metal layer 15 is provided with a suitable adhesive (not shown) on the back side (upper side in FIG. 2) opposite to the side to which the thermocouple 5 is fixed. ).

The metal layer 15 is formed of a thin aluminum foil having a smaller area than the area of the insulating tape 1 protruding from one end of the insulating tape 3, for example, a rectangular aluminum foil of about 20 μm. It is formed so as to overlap. As shown in FIG. 9 described above, this stuck-type surface temperature measuring device includes a metal object 1 to be measured.
The adhesive layer 7 of the tape 1 is attached to the surface of
Is brought into direct contact and the surface temperature is measured in the same manner as in the conventional example.

In the pasting-type surface temperature measuring device of the present invention configured as described above, the metal layer 15 overlaps the center of the insulating tape 1 itself on the joining portion 5a of the thermocouple 5 on the back side thereof. Thus, the heat that conducts to the back side of the insulating tape 1 is reflected by the metal layer 15 to the insulating tape 1 side, so that the insulating tape 1 itself is kept warm and the metal layer 15 Since the amount of heat radiation from the outer surface becomes the same as that of the surface of the object 13, it is possible to suppress the error of the surface temperature measurement of the object 13 in a high temperature range.

That is, when the surface temperature of the metal object 13 is measured by using the stick-type surface temperature measuring device of the present invention, the following temperature state is obtained when attention is paid to the surface of the object 13. . In general, when the surface of the object 13 has a constant temperature in a state where the measuring device is not in contact with the surface of the object 13, the surface temperature of the object 13 is determined by heat supply from the inside and heat dissipation to the outside air. Since it is determined based on the result of the steady exchange of heat, which is an exchange, when the measuring device is brought into contact with the surface of the object 13 to be measured, the relationship of exchange of heat is changed and the steady state is broken.

Here, considering the relationship between the relationship between the quantity of heat exchanged at the junction 5a of the thermocouple 5 and the measurement temperature at the surface boundary surface of the DUT 13, the DUT 13 is supplied to the junction 5a. The ratio A of the supply heat quantity Qin and the dissipated heat quantity Qout dissipated from the joint 5a by heat conduction or heat radiation is A =
It is expressed by Qin / Qout, and A <1 (Qin <Qout
In general, the thermocouple 5 detects the temperature lower by the amount of heat difference (Qin-Qout).

Therefore, when the bonded surface temperature measuring apparatus of the present invention is used for the object 13 made of a metal material,
The ratio A between the supply heat amount Qin and the dissipated heat amount Qout approaches "1", and the detection error decreases. In this case, the difference in temperature between the surface to which the measuring device is attached and the surface to which no measuring device is attached is relatively large because the thermal conductivity in the DUT 13 is relatively large. The difference is small. In other words, when the metal layer 15 is formed on the back side of the insulating tape 1, the joint 5 a of the thermocouple 5 and the vicinity thereof become the object 1 to be measured.
It is thought that it is close to the state arranged in 3.

Although the shape of the metal layer 15 in the above-described embodiment is rectangular, the heat insulating effect of the insulating tape 1 is increased and the amount of heat radiation from the outer surface is reduced, so that the junction of the thermocouple 5 is formed. In order to make 5a and its vicinity close to the state arranged in the object 13 to be measured, a circular metal layer 17 may be used as shown in FIG. May be. The metal layer 15 formed on the insulating tape 1 is not limited to the above-described aluminum foil, but may be a copper foil or the like. The metal layer 15 may be formed by a conventionally known method such as vapor deposition other than bonding.

FIG. 5 shows a temperature measuring apparatus in which a K-type thermocouple is sandwiched between glass fiber tapes 1 and 3 and a metal layer 15 made of aluminum foil having a thickness of 20 μm is adhered as described above. 4 shows a relationship between the area of the metal layer 15 and the detection error when the surface temperature of the DUT 13 is measured. The solid line in this figure is a virtual connection of a plurality of measurement points. According to this,
When the circular metal layer 15 having a diameter of about 2 mm is attached, the error is improved by about 27% even at about 150 ° C. compared to the conventional product, and when the temperature exceeds 200 ° C., the error caused by attaching the metal layer 15 is smaller. The error is further reduced when the circular metal layers 15 having diameters of 3 mm and 6 mm are pasted, and the error is reduced even when the square metal layer 15 of 7 × 8 mm is pasted.

Therefore, in the pasting type surface temperature measuring device of the present invention, if the area of the metal layer 15 is selected to be 3 mm ² or more, the surface temperature of the DUT 13 made of a metal material from a low temperature region to a high temperature region is reduced. It can be measured with a small error. Although the junction 5a of the thermocouple 5 is almost a point, the wire 5b of the thermocouple 5 extending in the longitudinal direction of the insulating tapes 1 and 3 is also affected by heat reception and heat radiation. It is preferable that the metal layer 15 be selected to have a predetermined area. The error in FIG. 5 is the difference between the conversion temperature obtained by converting the electromotive force of the thermocouple 5 with respect to the known test temperature and the conversion temperature with respect to the known test temperature corrected by the error of the thermocouple 5 itself. This is the difference from the later corrected temperature.

On the other hand, even if the area of the metal layer 15 was further increased from about 30 mm ^{2, the} measurement temperature error did not change much. This is because, when the area of the metal layer 15 is increased, the junction 5a of the thermocouple 5 becomes closer to the state where the junction 5a is arranged in the DUT 13. From this point,
When the metal layer 15 is formed on the back surface side of the insulating tape 1, the rationality of the concept equivalent to the case where the temperature measuring device of the present invention is arranged in the measured object 13 is confirmed.

Therefore, in order to make the temperature measuring device equivalent to being arranged in the object 13, the material of the metal layer 15 formed on the back side of the insulating tape 1 must be at least It is preferable to select the same type as the metal material on the surface, and it is possible to further reduce the error. Further, in the bonding type surface temperature measuring device of the present invention, the joining portion 5a
The present invention is not limited to the configuration in which the insulating tape 3 and the vicinity thereof are exposed. A configuration in which the insulating tape 3 is partially removed so as to expose the joining portion 5a of the thermocouple 5 and the vicinity thereof in the middle of the insulating tapes 1 and 3 is also possible. is there.

[0023]

As described above, in the pasting type surface temperature measuring apparatus of the present invention, a pair of insulating tapes are bonded via an adhesive layer to hold a thermocouple therebetween, and the vicinity of the junction of the thermocouple is provided. Because one of the insulating tapes was removed to partially expose the adhesive layer, and a metal layer of a predetermined area was formed on the back side of the other insulating tape so as to overlap the junction of the thermocouple. Even if an insulating tape with a thermocouple is attached to the object to be measured made of a metal material, it can be easily maintained without impairing the heat supply and heat dissipation relationship on the surface of the object to be measured. Accurate temperature measurement is possible, and a simple configuration can be maintained. In a configuration in which the area of the metal layer is selected to be 3 mm ² or more, or in a configuration in which the metal layer is formed of the same metal material as the object to be measured, the surface temperature of the object to be measured can be measured more accurately.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a sticking type surface temperature measuring device according to the present invention.

FIG. 2 is a side view of the sticking type surface temperature measuring device of FIG.

FIG. 3 is an enlarged bottom view showing a main part of the sticking type surface temperature measuring device of FIG.

FIG. 4 is an enlarged bottom view of a main part showing another embodiment of the sticking type surface temperature measuring device according to the present invention.

FIG. 5 is a diagram showing a measurement result when the surface temperature of an object to be measured is measured by the pasting-type surface temperature measuring device of the present invention.

FIG. 6 is a plan view showing a conventional sticking type surface temperature measuring device.

FIG. 7 is a side view of the sticking type surface temperature measuring device of FIG. 6;

FIG. 8 is an enlarged bottom view of a main part showing a main part of the sticking type surface temperature measuring device of FIG. 6;

FIG. 9 is a diagram illustrating an example of measuring the surface temperature of an object to be measured using a sticking type surface temperature measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 3 Tape 5 Thermocouple 5a Joint 5b Wire 7 Adhesive layer 9 Connection electrode 11 Terminal plate 13 DUT 15, 17 Metal layer

Claims (3)

[Claims] 1. A thermocouple, comprising: a pair of insulating tapes which hold the thermocouple between the thermocouples via an adhesive layer, and one of the insulating tapes near a junction of the thermocouple. In the pasting-type surface temperature measuring device, which removes the bonding portion of the thermocouple together with the adhesive layer, a metal layer is formed on the back side of the other insulating tape so as to overlap the bonding portion of the thermocouple. A sticking type surface temperature measuring device characterized by forming: 2. The sticking type surface temperature measuring device according to claim 1, wherein the metal layer is selected to have an area of 3 mm ² or more, and a central portion thereof is formed so as to overlap a junction of the thermocouple. 3. The stick-type surface temperature measuring device according to claim 1, wherein the metal layer is made of the same kind of metal material as the object to be measured.