JP2539431Y2 - Thermocouple temperature measurement device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocouple temperature measuring device, and more particularly to improvement of a temperature difference between terminals on a terminal plate.

[0002]

2. Description of the Related Art One type of temperature measuring device is a thermocouple temperature measuring device using a thermocouple. Meanwhile, when measuring the temperature using a thermocouple, generally, the temperature of the reference junction is separately measured, and the thermoelectromotive force of the thermocouple is compensated by the measured value.

FIG. 3 is a structural explanatory view showing an example of such a conventional thermocouple temperature measuring device. In FIG. 3, 1 is a main body of a temperature measuring device having a heat source such as a measurement recording unit,
Reference numeral 2 denotes a terminal plate to which a thermocouple is connected. The terminal plate 2 is attached to the main body 1 via studs 3 and 4 so as to be thermally insulated from the main body 1. A terminal 5 for connecting a thermocouple is implanted on one surface of the terminal plate 2, and an isothermal plate 6 for equalizing the temperature between the terminals 5 is provided on the other surface facing the main body 1. Have been. As this isothermal plate 6,
In order to reduce the influence of heat transfer due to convection of air between the main body 1 and the terminal plate 2, a material having a certain thickness (for example, 1 mm), such as copper, having excellent thermal conductivity is used. Reference numeral 7 denotes a temperature sensor such as a transistor or thermistor for measuring the temperature of the terminal plate 2, which is attached to a part of the terminal plate 2.

In such a configuration, a thermoelectromotive force is generated between the terminal 5 and a thermocouple (not shown) due to the Seebeck effect. Accordingly, if there is a temperature difference between the terminals, the thermoelectromotive force component of the temperature difference becomes a measurement error. Therefore, the temperature difference between the terminals is minimized by the isothermal plate 6, and the temperature measurement by the thermocouple is performed while the thermoelectromotive force of the thermocouple is compensated using the measured value of the temperature sensor 7 as the reference contact temperature.

[0005]

However, according to such a configuration, since the isothermal plate 4 is made of a relatively expensive material having an excellent thermal conductivity and a certain plate thickness, the cost increases. In addition, there is a problem that the weight increases. In addition, if the thickness of the isothermal plate is increased, the isothermal effect increases, but on the other hand, the heat absorption capacity increases and the heat transferred to the inside of the terminal plate via the isothermal plate also increases.

The present invention is directed to such a problem, and an object of the present invention is to provide a thermocouple temperature measuring device capable of reducing a temperature difference between terminals without using an external isothermal plate. is there.

[0007]

SUMMARY OF THE INVENTION The present invention, which achieves the above object, is directed to a temperature measuring apparatus in which a terminal plate for connecting a thermocouple to a part of an apparatus main body including a heat source is attached via a stud. A printed circuit board of a metal core is embedded in the terminal plate, and a heat reflector is provided on a surface of the terminal plate facing the device body.

[0008]

The heat radiated from the heat source of the apparatus body toward the terminal plate is reflected by the heat reflector, and the temperature rise inside the terminal plate due to the radiated heat is suppressed. Then, the heat mainly conducted into the terminal board through the studs is diffused by the printed circuit board of the metal core to achieve isothermal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of the configuration of an embodiment of the present invention, and portions common to FIG. 3 are denoted by the same reference numerals. In the figure, reference numeral 11 denotes a printed circuit board of a metal core constituting a terminal board, and an end of the terminal 5 is soldered. 1
Reference numeral 2 denotes a terminal plate cover formed of an insulating resin into a rectangular tube shape so as to surround a terminal plate constituted by the terminals 5 and the printed circuit board 11, and 13 denotes an insulating resin so as to cover the back side of the cover 12. It is a cover formed in the shape of a flat plate, and these covers 12 and 13 form a terminal plate cover in the shape of a bottomed rectangular tube. The bottomed rectangular tubular terminal plate cover thus configured is attached to the apparatus main body 1 via studs 3 and 4. Reference numeral 14 denotes a heat reflector, which is attached to a surface of the cover 13 facing the apparatus main body 1. As the heat reflector 14, an aluminum foil may be attached, or a material having a low heat absorption such as aluminum, gold, or silver may be deposited.
The terminals 5 of the terminal board and the internal circuit of the apparatus main body 1 are electrically connected via a connector attached to the printed circuit board 11 and a connector attached to the apparatus main body 1. do not do.

In such a configuration, heat radiated from the heat source of the apparatus main body 1 toward the terminal plate is reflected by the heat reflector 14 and diffused and radiated to the space formed by the studs 3 and 4. Further, since the aluminum foil 14 has a small absorption heat capacity, a temperature change due to heat conduction is small. According to an actual measurement example of the temperature rise when the aluminum foil 14 is attached and when it is not attached, an improvement effect of about 1.5 ° C. was confirmed.

On the other hand, the temperature difference between the terminals 5 is improved by the heat conduction characteristics of the metal core used as the printed board 11. Compared to a similar size terminal board made of epoxy printed circuit board, the temperature difference was about 1 ° C,
For a printed circuit board with a metal core, the temperature was improved to about 0.5 ° C. FIG. 2 is an explanatory view of the configuration of another embodiment of the present invention. In the embodiment shown in FIG. 2, the cover 13 is formed of a transparent resin as the heat reflector 15 on the surface facing the apparatus body 1 and has a length of 5 m.
A bracket filled with small pieces of aluminum foil of m to 20 mm is attached.

According to such a configuration, the bracket 15
Is filled with small pieces of aluminum foil, so that the heat absorption capacity is smaller than in FIG. 1, and the heat transfer to the terminal plate is also reduced due to the irregular reflection of the small pieces of aluminum foil. When compared with the same size as in FIG. 1, a temperature suppression improvement effect of about 1 ° C. was further confirmed as compared with the configuration in FIG.

[0013]

[Effects of the Invention] As described above, according to the present invention,
A thermocouple temperature measuring device that can reduce the temperature difference between terminals without using an external isothermal plate can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating the configuration of another embodiment of the present invention.

FIG. 3 is a configuration explanatory view showing an example of a conventional thermocouple temperature measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Apparatus main body 3, 4 Stud 5 Terminal 11 Metal core printed circuit board 12, 13 Cover 14 Heat reflector (aluminum foil) 15 Heat reflector (a transparent bracket containing a small piece of aluminum foil)

Claims (1)

(57) [Scope of request for utility model registration] 1. A temperature measuring device in which a terminal plate for connecting a thermocouple is mounted via a stud to a part of a device body including a heat source, wherein a printed board of a metal core is embedded in the terminal plate. A thermocouple temperature measuring device, wherein a heat reflector is provided on a surface of the terminal plate facing the device main body.