JPH06167395A - Temperature generator - Google Patents

Abstract

PURPOSE:To provide a temperature generator in which influence of thermal expansion of a carbon heating element being heated through conduction is allayed. CONSTITUTION:A heating pipe 10 made of carbon is provided on electrode bodies 31, 32 through a conductor 8 made of carbon. The conductor 8 is split into a plurality of sections and held while being pressed by a resilient body 9. The electrodes 31, 32 are cooled with water and conducted through electrode leads 13a, 13b. The heating pipe 10 is conducted through the electrodes 31, 32 and the conductor 8 and heated but influence of thermal expansion can be allayed through function of the conductor 8, the resilient body 9, etc., made of same material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to a radiation thermometer calibration,
The present invention relates to a temperature generator suitable for a high temperature blackbody furnace used for calibrating a scale or the like.

[0002]

2. Description of the Related Art Conventionally, as a temperature generator such as a black body furnace that achieves a high temperature, in order to prevent the influence of thermal expansion, simply provide a spring or move a heating element developed by the applicant. There has been proposed a device that uses a movable table or the like that can be held (JP-A-63-247587).

[0003]

However, in such a device, there is a tendency that the absorption mechanism for the thermal expansion of the black body furnace itself which is electrically heated is complicated.

In view of the above points, an object of the present invention is to provide a temperature generating device suitable for generating a high temperature.

[0005]

According to the present invention, there is provided a heating tube made of carbon which is energized to generate heat, an electrode body for supplying current to the heating tube, and an interposing between the electrode body and the heating tube. A temperature generator provided with a conductor made of carbon provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural explanatory view showing an embodiment of the present invention.

In the figure, reference numeral 1 designates an outer cylinder made of stainless steel or the like, which is a double cylinder and can be cooled by introducing water from the pipes 1a and 1b. The pipe 1c is evacuated or replaced with an inert gas. it can. Inner plates 2a and 2b having an opening at the center are formed and provided on both sides of the outer cylinder 1.
The outside is insulated with an appropriate insulating material 40, and metal electrode bodies 31 and 32 as side plates are insulated and fastened with a bolt 4 having an insulating material (color) 41.

The electrode bodies 31, 32 have a through hole in the central axial direction, and introduce water from the pipes 31a, 31b, 32a, 32b to cool them, and attach outer plates 5a, 5b,
A window glass 7 is provided on the outer plates 5a and 5b by caps 6a and 6b. Both ends of the heat generating tube 10 made of carbon are held in the through holes at the centers of the electrode bodies 31, 32 through the heat conductor 8 made of carbon having a wedge-shaped cross section or carbon of graphite. ing. This heating tube 10 has a bottom part 10 for aiming with a radiation thermometer.
The conductor 10 has "a" in the center, and is pressed from the outside by an elastic body 9 such as a spring at a portion contacting the outer plates 5a, 5b.

An auxiliary pipe 11 is provided on the outer circumference of the heat generating tube 10, a plurality of layers of a radiation sealing cylinder 12 are provided between the auxiliary tube 11 and the outer cylinder 10, and a heat insulating material is provided. You may do it. Then, the electrode bodies 31, 32
Electrode wires 13a and 13b for energization are attached to outer surfaces of the bolts with bolts 14a and 14b.

That is, when the electrode wires 13a and 13b are energized, a current flows through, for example, the electrode body 31, the conductor 8, the exothermic tube 10, the conductor 8 and the electrode body 32, and the exothermic tube 10 is energized and heated to generate heat. The inside becomes a high temperature and becomes a substantially black body state, and a desired temperature can be generated. At this time,
The carbon heating tube 10 expands in the longitudinal direction. The linear expansion coefficient of carbon such as graphite is set to about 3 × 10 ^-6 (K ^-1 ),
Raise the temperature to 3000K and increase the length of the heating tube 10 to 5
Assuming that about 1/2 of that is heated at 00 mm, the heat generating tube 10 expands by about 2.3 mm from 3 × 10 ⁻⁶ × 3 · 10 ³ × 500 × 0.5 = 2.25. . In this case, since the carbon heat transfer body 8 is interposed, it is made of the same material and has lubricity, so that it can expand and contract with respect to expansion without being eaten like copper. Further, since the conductor 8 has an inclination on the outer periphery and is pressed by the elastic body 9, it is possible to sufficiently cope with expansion and contraction. In addition, the electrode body 31,
Since the inside of 32 is water-cooled, it is possible to prevent heating, and by aiming the bottomed portion 10a of the heat generating tube 10 through the window glass 7, it is possible to sufficiently calibrate and calibrate the radiation thermometer and the like.

The tubular conductor 8 whose outer diameter matches the inner diameter of the electrode bodies 31 and 32 has a slope that increases outward in FIG. It is also possible to provide a slant that increases toward the outside on the inner peripheral side that contacts and to press with the elastic body 9. Further, as shown in FIG. 2, the carbon conductor 8 has three or more portions 8a,
It can be divided into 8b and 8c and pressed uniformly, and thermal cracking can be prevented.

[0012]

As described above, according to the present invention, the carbon heating element to be electrically heated is provided on the electrode body with the carbon conductor interposed. Therefore, even if the heating tube expands or contracts due to thermal expansion,
The contact can be maintained smoothly without being eaten, the influence of thermal expansion can be reduced, and the present invention is suitable for a temperature generator such as a blackbody furnace. Also, by pressing the conductor with an elastic body, sufficient balance can be obtained, and since the conductor is divided into a plurality of parts, the conductor can be pressed uniformly, which is sufficient for use in a high temperature temperature generator. It is possible to have reliability and stability. Moreover, since the electrode body itself is water-cooled, a sufficient cooling effect can be obtained.

[Brief description of drawings]

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

FIG. 2 is a structural explanatory view of a portion showing an embodiment of the present invention.

[Explanation of symbols]

 1 Outer cylinder 31, 32 Electrode body 4 Bolts 40, 41 Insulation material 5a, 5b Outer plates 6a, 6b Cap 7 Window glass 8 Heat transfer body 9 Elastic body 10 Exothermic tube 11 Auxiliary tube 12 Cylindrical body 13a, 13b Electrode wire 14a, 14b bolt

Claims (1)

[Claims] 1. A heat-generating tube made of carbon that is energized to generate heat, an electrode body for supplying electricity to the heat-generating tube, and a conductor made of carbon provided between the electrode body and the heat-generating tube. A temperature generator comprising: