KR20120040631A - Thermo-couple for temperature measurement and method of manufacturing the same - Google Patents

Abstract

PURPOSE: A thermo couple for measuring temperature is provided to prevent the confusion of temperature distribution or time delay, thereby improving the precision of temperature measurement. CONSTITUTION: A thermo couple for measuring temperature comprises a metal thin plate(40), and thermocouple wire, and comprises a base thin plate, and a cover thin plate as a metal plate. In a metal sheath, the base thin plate is arranged on the outside of the opposite side to the surface of an object. The cover thin film is contact to the side to the surface of an object, and forms one body by being contact to the base plate.

Description

Thermocouple for temperature measurement and its manufacturing method {THERMO-COUPLE FOR TEMPERATURE MEASUREMENT AND METHOD OF MANUFACTURING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocouple for temperature measurement for detecting the surface temperature of a temperature measurement body and a manufacturing method thereof.

Conventionally, thermocouples for long-term measurement of the temperature of the surface of a temperature-measuring body, thermocouple wires made of different kinds of metals, are insulated from a metal sheath whose ends are sealed with an electrical insulating material. The metal sheath embedded together was embedded in a metal plate having a thickness of about 3-5 mm, and the metal sheath was mounted on the surface of the temperature measurement body by electric or gas welding. However, in this type of thermocouple, since the volume of the temperature sensing portion becomes large and the heat capacity also increases, time delay occurs, and when the temperature of the temperature measurement body fluctuates, accurate temperature cannot be measured.

In order to solve this problem, a metal thin plate for attaching to the surface of the temperature-sensitive body is fixed to the outer surface of the metal sheath, thereby reducing the heat capacity of the temperature-sensitive portion, thereby improving heat conductivity and improving the temperature of the temperature-sensitive body Even if the temperature of fluctuates in a short time, a thermocouple capable of following this has already been proposed. Specifically, as a metal thin plate, a base thin plate disposed in contact with the outer surface of the side facing the surface of the to-be-warmed body in the metal sheath, and the side not facing the surface of the to-be-warmed body in the metal sheath. It is disclosed that a cover thin plate is deposited on the outer surface of the substrate in contact with the base thin plate and bonded to the base thin plate to be integrated (see Patent Document 1, for example).

However, even in a thermocouple composed of a base thin plate and a cover thin plate, when welding the base thin plate or the cover thin plate to the outer circumferential surface of the metal sheath, a thin sheath can easily be punctured (heated) if the power is not controlled small. There is concern. In actual production, the base thin plate and the cover thin plate are welded to each other at the position as close as possible to the metal sheath, and the metal sheath is inserted into two thin plates without being directly welded. However, in the structure of only the inserted one, thermal breakdown can be prevented to some extent as compared with the structure directly welded to the sheath. However, since a gap is actually generated between each thin plate and the metal sheath, thermal conductivity is damaged. In addition to the time delay, there was a problem that the temperature distribution was confused and the accuracy of the thermometer was lowered.

Japanese Unexamined Patent Publication No. Hei 1-145537

In view of the above situation, the present invention attempts to solve the above problem in the thermocouple using a thin plate, while preventing the thermal breakdown of the metal sheath, while preventing the time delay and the temperature distribution caused by the gap between the thin plate and the metal sheath. The present invention provides a thermocouple for measuring temperature and a method of manufacturing the same, which can avoid and improve the accuracy of thermometer measurement.

In order to solve the above problems, the present invention incorporates thermocouple element wires made of different kinds of metals together with an electrical insulating material in a metal sheath whose tip is sealed. In the thermocouple for temperature measurement formed by fixing a metal thin plate for adhering to the surface of a temperature measuring body on the outer surface of said metal sheath, as said metal thin plate, A base thin plate disposed in contact with an outer surface of the side of the metal sheath opposite to the surface of the to-be-warmed body, and a contact state of an outer surface of the side of the metal sheath not facing the surface of the to-be-warmed body A cover thin plate attached to the base thin plate and integrally bonded to the base thin plate, and at least the cover thin plate By welding to the outer surface of the distal end portion of the metal-based systems were configured and fixed to a thermocouple for temperature measurement is made. Here, the tip of the metal sheath refers to the sealing portion of the tip or a portion near the tip.

In addition, the present invention is a temperature measurement made by embedding thermocouple wires made of different kinds of metals together with an electrical insulating material in a metal sheath whose tip is sealed, and fixing a metal thin plate for attaching to the surface of the temperature measuring body on the outer surface of the metal sheath. In the thermocouple for heat treatment, as the metal thin plate, a cover thin plate is attached to the outer surface of the side of the metal sheath that is not opposed to the surface of the to-be-warmed body and is attached to the surface of the to-be-warmed body, and the cover thin plate is at least A thermocouple for temperature measurement, which is fixed by welding to the outer surface of the tip of the metal sheath, was also constructed.

Here, the cover thin plate is similarly welded to the outer peripheral surface of the base end side from the main joint portion welded to at least the outer surface of the distal end of the metal sheath and the distal end seal of the metal sheath. It is preferable to fix to the said metal sheath by a non-joint part.

It is preferable that welding of the said main junction part and a subjunction part is electric resistance welding, and setting the power of welding of the said subjunction part small compared with the welding of the said main junction part. Here, the power of welding can be set by controlling the power supply voltage of welding, or controlling current, welding time, and pressure.

In addition, the present invention is a temperature measurement made by embedding thermocouple wires made of different kinds of metals together with an electrical insulating material in a metal sheath whose tip is sealed, and fixing a metal thin plate for attaching to the surface of the temperature measuring body on the outer surface of the metal sheath. A method of manufacturing a thermocouple for use, the base metal plate being disposed in contact with an outer surface of a side of the metal sheath that faces the surface of the to-be-warmed body, and the side of the metal sheath not facing the to-be-warmed body surface in the metal sheath. And a cover sheet that is deposited in contact with the outer surface and bonded to and integrated with the base sheet. After the cover sheet is welded to the outer surface of the distal end of the metal sheath, the cover sheet is surfaced in the metal sheath. Other than the side not facing In addition to the pressure contact along the surface, both side end portions are in surface contact with the base sheet extending in the base sheet state, and both side end portions are kept in the base thin plate while maintaining the press contact state. Also provided is a method for manufacturing a thermocouple for temperature measurement, wherein the cover thin plate is joined to the base thin plate to be integrated.

Here, after welding the said cover thin plate to the outer surface of a metal sheath tip part, it is preferable to weld the cover thin plate similarly to one or more places with respect to the outer peripheral surface of a base end side more than the tip part of the said metal sheath.

In particular, it is preferable to set welding of the cover thin plate to the metal sheath as electrical resistance welding, and to set the power of welding of the subjunction of the proximal end smaller than the welding of the main joint of the weld to the metal sheath distal end.

Moreover, before welding the said cover thin plate to the outer surface of a metal sheath tip part, it is preferable to weld the said base thin plate to the outer surface of the side which opposes the surface of a to-be-warmed body in a metal sheath tip part.

The thermocouple for temperature measurement which concerns on this invention made as mentioned above is a metal thin plate, Comprising: The base thin plate arrange | positioned in contact with the outer surface of the side which opposes the surface of a to-be-warmed body in a metal sheath, and the surface of a to-be-warmed body in a metal sheath. The cover thin plate and the metal sheath are formed by attaching a cover thin plate which is deposited in contact with the outer surface of the non-facing side and bonded to the base thin plate and is fixed by welding the cover thin plate to at least the outer surface of the distal end of the metal sheath. Since the gap between them can be eliminated, and the cover sheet can be integrated with the base sheet by welding or the like while the cover sheet and the metal sheath are welded and integrated, the gap between the metal sheath and the metal sheath during the integration can be eliminated. It is easy to be avoided Control and workability is remarkably improved, not the distance between each of the thin plate and the metal sheath can improve the temperature measurement accuracy by avoiding the confusion of the time delay or the temperature distribution. In the present invention, the cover thin plate is welded to the outer surface of the distal end of the metal sheath. In other words, the present invention focuses on the fact that the vicinity of the tip sealing portion of the metal sheath becomes thick and hardly causes thermal breakage by welding. Thus, by welding the cover plate to the tip portion, the above-described effect can be eliminated. It is possible to do that.

In addition, as a thin metal plate, a cover thin plate is attached to the outer surface of the side of the metal sheath, which is not opposite to the surface of the to-be-warmed body, and is attached to the surface of the to-be-warmed body, and the cover thin plate is at least on the outer surface of the distal end of the metal sheath. The thermocouple for temperature measurement fixed by welding can likewise eliminate the gap between the cover sheet and the metal sheath, thereby improving the accuracy of the thermometer side by avoiding time delay and confusion of temperature distribution.

In the case where the cover thin plate is fixed to the metal sheath by at least a main joint portion welded to the outer surface of the distal end portion of the metal sheath and one or a plurality of subjunction portions similarly welded to the outer circumferential surface on the proximal side from the front end sealing portion of the metal sheath, the metal The space between the sheath and the cover sheet can be removed more reliably.

In particular, since the welding of the main junction part and the subjunction part is electric resistance welding, and the welding power of the subjunction part is set smaller than the welding of the main junction part, the subjunction part is welded to a thin metal sheath and thermally destroyed. The adhesion between the metal sheath and the cover thin plate can be maintained while preventing.

According to the method for manufacturing a thermocouple for temperature measurement according to the present invention, after the cover thin plate is welded to the outer surface of the distal end portion of the metal sheath, the outer surface of the side of the side in which the cover thin plate is not opposed to the surface of the body to be measured in the metal sheath. The cover thin plate is joined to the base thin plate and integrated by welding the both side ends to the base thin plate while keeping the pressure contact state. Since the cover sheet is fixed by welding the cover sheet using a metal sheath tip that is hard to cause thermal breakage, the cover sheet is easily pressed along the outer surface of the metal sheath, and both side ends are formed on the base sheet. Easily extended Can be brought into contact, can also be in pressure contact with the art, the surface of the contact operation it is possible to avoid that the cover sheet is shifted by moving, the more tightly as compared with the case that is not fixed by welding without a gap state. In addition, both side ends can be easily joined and integrated with the base sheet while maintaining the tight contact state. As a product, it is possible to improve the accuracy of the thermometer side by avoiding time delay or temperature distribution without any gap. In addition, the efficiency of the manufacturing operation can be significantly improved.

In addition, since the cover thin plate was welded to the outer surface of the metal sheath distal end portion in the same manner, the cover thin plate was welded to one or more places on the outer circumferential surface of the base end side more than the distal end of the metal sheath. It is possible to perform welding with high precision while controlling the welding power of the proximal end in a fixed and stable state at the same time.

Specifically, the welding of the cover thin plate to the metal sheath was made of electrical resistance welding, and the welding power of the subjunction of the base end was smaller than that of the main joint of the weld to the metal sheath distal end. It can be welded to close the cover sheet without gaps without causing thermal breakage to the outer surface of the thin metal sheath.

In addition, before welding the cover thin plate to the outer surface of the metal sheath distal end portion, the base thin plate is welded to the outer surface of the side of the metal sheath distal end facing the surface to be measured, so that the welding of the cover thin plate or the outer surface of the metal sheath of the cover thin plate is carried out. The base thin plate can be prevented from being shifted at the time of pressure welding and the like, and the alignment of the base thin plate and the cover thin plate can be more surely ensured.

1 is a perspective view showing the overall configuration of a thermocouple for temperature measurement according to a first embodiment of the present invention.
Fig. 2 is a perspective view showing a state in which a thermocouple for measuring temperature is attached to a surface of a temperature measurement body.
In FIG. 3, (a) is a longitudinal cross-sectional view of the thermocouple for temperature measurement, (b) is a AA cross-sectional view of (a), and (c) is a BB cross-sectional view of (a).
In FIG. 4, (a)-(d) is explanatory drawing which shows the manufacturing procedure of the thermocouple for temperature measurement.
In FIG. 5, (a) and (b) are explanatory drawing which shows the manufacture procedure of the modification of the thermocouple for temperature measurement.
Fig. 6 is a sectional view showing a thermocouple for temperature measurement according to a second embodiment of the present invention, (a) is a cross sectional view at the front end of the metal sheath, and (b) is a sectional view at the proximal end.

EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described in detail based on attached drawing.

1 to 5 show a first embodiment, FIG. 6 shows a second embodiment, in which 1 is a thermocouple for temperature measurement, and 2 is a metal sheath. 3 denotes a thermocouple element wire, and 4 denotes a metal thin plate.

First, the first embodiment of the present invention will be described with reference to Figs.

In the thermocouple 1 for temperature measurement of this embodiment, as shown in FIGS. 1-3, the thermocouple element wires 3 and 3 which consist of metals of different types are electrically insulated from the metal sheath 2 by which the front end was sealed. It is built together with the electromembrane 5, and the metal thin plate 4 for fixing to the surface of the to-be-thermothermal body surface 9 is fixed to the outer surface of the said metal sheath 2. As shown in FIG.

As the metal sheath 2, for example, austenitic stainless steel (SUS304, SUS316, etc.), nickel-chrome-based heat-resistant alloy (Inconel), or the like can be used. have. The built-in thermocouple wire 3 may be, for example, a nickel-chromium alloy on the positive side wire and a nickel alloy on the negative side wire, but is not particularly limited. In addition, the electrical insulating material is filled (充塡) in the system may be used, such as MgO or Al ₂ O _3. Although the on-contact point 30 of the tip of a thermocouple is a thing which is not in contact with a metal sheath in this example, it was formed by welding to the pipe wall of the lower part of the metal sheath 2 at the side of a to-be-welded body. When sealing the tip, it may be integrated with the tip 20.

The sizes of these metal sheaths are not particularly limited, and for example, the thermocouple element wires 3 and 3 having a diameter of 0.6 mm phi are fixed by inserting MgO or the like into the metal sheath 2 having a thickness of 0.5 mm and a diameter of 3.2 mm phi. The shape of the metal sheath 2 is, for example, formed into a semi-circular convex shape with a convex center like fish cake in order to bring the metal sheath into close contact with the temperature-measuring body. In addition, although the example which accommodated only one pair of thermocouple wires 3 and 3 is illustrated in this example, what inserted multiple pairs may of course be sufficient.

The metal thin plate 4 for attaching the metal sheath 2 to the surface of the to-be-heated body 9 is brought into contact with the outer surface of the side of the metal sheath 2 that opposes the surface of the body to-be-measured 9. The base thin plate 40 disposed and the outer surface of the side of the metal sheath 2 that are not opposed to the temperature-bearing body surface 9 are deposited in contact with each other and joined to and integrated with the base thin plate 40. A cover thin plate 41 is formed. Although the base material of these base thin plates 40 and the cover thin plates 41 is the same material as a to-be-warmed body, in order to avoid the confusion of temperature distribution by the difference of thermal conductivity, another material may be employ | adopted. In this example, for example, a thin stainless plate having a thickness of about 0.1 mm is used, but various metal materials may be used depending on the use place and purpose, and the thickness thereof may also be appropriately adjusted. The base thin plate 40, the cover thin plate 41, and the metal sheath 2, which are welded and fixed to each other, are made of the same material, so that the fixing property at the time of mutual welding is improved, thereby reducing the welding power and preventing thermal breakdown. There is an advantage that can maintain the fixed strength.

The cover thin plate 41 is fixed by welding to the outer surface 21 of the tip portion 20 at least in the metal sheath 2, and in this example, the main joint portion welded to the outer surface 21 of the tip portion 20. A plurality of subjunctions 62,... Welded to the outer circumferential surface 22 on the proximal side from the tip seal of the section 61 and the metal sheath 2. It is fixed to the metal sheath 2 by it. The welding of the main junction part 61 and the subjunction part 62 is an electric resistance welding suitable for welding of thin plates. The welding power of the subjunction part 62 is set small compared with the welding of the main junction part 61 here. Specifically, the welding power supply voltage is set smaller.

As the to-be-warmed body, for example, it is a boiler tube in which water is present, and as shown in FIG. 2, a weld joint part by spot welding or the like of the base thin plate 40 on the surface 9 thereof ( By attaching by the combination 64, this base thin plate 40 is closely_contact | adhered along the curved surface of a boiler tube with the cover thin plate 41. As shown in FIG. The base thin plate 40 may be fixed to the surface of the to-be-temperature-retained body 9 by other attachment means than welding. The welding of the base thin plate 40 to the surface of the to-be-warmed body can use various kinds of welding other than electric resistance welding, and Tig welding and laser welding are also used suitably.

Hereinafter, the thermocouple 1 for temperature measurement is further demonstrated based on the manufacturing procedure of FIG.

First, as shown in Fig. 4 (a), the base thin plate 40 is welded to the outer surface 23 on the side of the metal sheath distal end portion 20 opposite to the surface of the to-be-warmed body (welding joint 60). Next, as shown in Fig. 4 (a), the cover thin plate 41 whose cross section is already bent into an Ω shape from the upper side in advance is subjected to the temperature measurement body in the metal sheath 2. It covers the outer surface 24 of the side which does not oppose the surface 9, and welds to the outer surface 21 (normal position) of the front end part 20 of the metal sheath 2, as shown in FIG. The welding of these base thin plates 40 and the cover thin plates 41 to the metal sheath tip 20 can be suitably used for electric resistance welding.

Although the cover thin plate 41 is deformed in advance along the shape of the metal sheath 2 in this way, the attachment work becomes easy and the adhesion can be more easily realized. However, the present invention is not limited thereto, but is not limited thereto. For example, as shown in the modification of FIG. 5, instead of deforming the cover thin plate 41 in advance, the pressure contact is performed along the outer surface of the metal sheath 2 that is not opposed to the surface of the to-be-warmed body 9. It may be made to deform when doing so.

Next, the cover thin plate 41 is further welded to one or more places with respect to the outer peripheral surface 22 (as well as the normal position) on the proximal side than the tip portion 20 of the metal sheath 2. Electric resistance welding is also suitable for the welding of the subjunctions 62,... On the proximal side, but the power thereof is set smaller than that of the main junction 61, which is the welding to the metal sheath tip 20.

Thus, the cover thin plate 41 is welded by the main joint part 61 and the sub joint part 62 along the normal position of the metal sheath 2, and as shown in FIG. While pressing 41 to the metal sheath 2 along the outer surface of the side which is not opposed to the to-be-warmed body surface 9, both side ends 41a and 41a are base thin plates 40, respectively. Surface contact in an extended state), and both side end portions 41a and 41a are welded to the base thin plate 40, respectively, while maintaining the pressure contact state. 41) is bonded to the base thin plate 40 and integrated. On the other hand, in addition to the weld joint 60 welded to the outer surface 23 of the metal sheath distal end portion 20, the base thin plate 40 is also welded to one or more places with relatively smaller power on the outer peripheral surface of the base end side. It is preferable embodiment to form a junction part.

Next, 2nd Embodiment of this invention is described based on FIG.

In the present embodiment, the metal thin plate 4 is provided with a cover thin plate 41 which is deposited in contact with the outer surface of the side of the metal sheath 2 which is not opposed to the surface of the temperature-measured body and is attached to the surface of the temperature-measured body. The base thin plate in the first embodiment is omitted. Also in this example, the cover thin plate 41 is fixed by being welded to at least the outer surface 21 of the metal sheath distal end portion 20, and the main joint portion 61 welded to the outer surface 21 of the distal end portion 20 similarly to the first embodiment. And a plurality of subjunctions 62,... Which are similarly welded to the outer circumferential surface 22 on the proximal side from the tip sealing portion of the metal sheath 2, and are fixed to the metal sheath 2. According to this example, the cover thin plate 41 is attached to the surface 9 of the boiler tube or the like by spot welding or the like. Since the structure other than this is fundamentally the same as the said 1st Embodiment, the same code | symbol is attached | subjected about the same structure, and the description is abbreviate | omitted.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the example of such embodiment at all, It cannot be overemphasized that it can implement in various forms in the range which does not deviate from the summary of this invention. .

1: Thermocouple for temperature measurement
2: metal sheath
3: thermocouple element wire
4: metal sheet
5: electrical insulation material
9: surface of the thermometer
20: metal sheath tip
21: exterior
22: outer circumference
23: exterior
24: exterior
30: hot contact
40: base lamination
41: cover lamination
41a: side end
60: welded joint
61: main junction
62: non-junction
63: welded joint
64: welded joint

Claims (8)

Thermocouple wires made of different kinds of metals are embedded in a metal sheath in which the ends are sealed together with an electrical insulating material, and the surface of the temperature measurement body is formed on the outer surface of the metal sheath. In the thermocouple for temperature measurement formed by fixing a metal thin plate to be attached to the surface of the body,
The metal thin plate comprising: a base thin plate disposed in contact with an outer surface of a side facing the surface of the to-be-warmed body in the metal sheath; and a side not facing the surface of the to-be-warmed body in the metal sheath. A cover sheet which is deposited in contact with the outer surface of the substrate and is bonded to the base sheet to be integrated;
The cover thin plate is fixed by welding at least to the outer surface of the distal end of the metal sheath.
In the thermocouple element wires made of different kinds of metals are embedded in a metal sheath whose tip is sealed together with an electrical insulating material, and a metal thin plate for fixing to the surface of the temperature measuring body on the outer surface of the metal sheath, wherein the thermocouple for temperature measurement
The metal thin plate is provided with a cover thin plate which is deposited in contact with the outer surface of the side of the metal sheath which is not opposed to the surface of the to-be-warmed body and adhered to the surface of the to-be-warmed body,
The cover thin plate is fixed by welding at least to the outer surface of the distal end of the metal sheath.
The method according to claim 1 or 2,
One or a plurality of subjunctions in which the cover thin plate is similarly welded to the outer circumferential surface of the base end side from at least the main joint portion welded to the outer surface of the tip end portion of the metal sheath and the tip seal portion of the metal sheath. A thermocouple for temperature measurement, wherein the thermocouple is fixed to the metal sheath by means of a metal part.
The method of claim 3,
The thermocouple for temperature measurement, characterized in that the welding of the main junction and the subjunction is electric resistance welding, and the welding power of the subjunction is set smaller than that of the main junction.
Thermocouple element wires made of different metals are embedded in a metal sheath whose tip is sealed together with an electrical insulating material, and a metal sheet for attaching the surface of the temperature measuring body to the outer surface of the metal sheath is fixed to a method of manufacturing a thermocouple for temperature measurement. As
The metal thin plate is deposited in contact with a base thin plate which is arranged in contact with an outer surface of a side of the metal sheath facing the surface of the to-be-warmed body, and an outer surface of the side of the metal sheath which is not opposed to the surface of the to-be-warmed body. It is also made of a cover thin plate bonded to the base thin plate to integrate,
After welding the cover sheet to the outer surface of the tip of the metal sheath,
The cover thin plate is pressed against the outer surface of the side of the metal sheath that is not opposed to the surface of the to-be-warmed body, and both side end portions thereof are in surface contact with the base thin plate extending.面 接觸)
A method for manufacturing a thermocouple for temperature measurement, characterized in that the cover thin plate is joined to the base thin plate and integrated by welding both side ends to the base thin plate while maintaining the pressure contact state.
The method of claim 5,
After welding the said cover thin plate to the outer surface of a metal sheath tip part, the cover thin plate is welded more to one or more place with respect to the outer peripheral surface of the base end side than the tip part of the said metal sheath similarly, The temperature characterized by the above-mentioned. Method of manufacturing a thermocouple for measurement.
The method of claim 6,
The welding to the metal sheath of the cover sheet is made of electric resistance welding, and the welding power of the subjunction of the base end side is set smaller than the welding of the main joint of the welding to the metal sheath distal end. Method of manufacturing thermocouples.
The method according to any one of claims 5 to 7,
The base thin plate is welded to the outer surface of the side of the metal sheath distal end that is opposite to the surface of the temperature measuring body before the cover thin plate is welded to the outer face of the metal sheath distal end portion.

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