JPH0362491A - Heat generating device - Google Patents

Abstract

PURPOSE:To provide an extremely compact structure by mounting a heating element consisting of a carbon fiber reinforced carbon composite material on the base plate of an electric furnace. CONSTITUTION:A heating element 10 is formed of a carbon reinforced carbon composite material (hereinafter referred to as C/C material). In the heating element 10, the C/C material is slitted into a rectangular wave form, the whole body is formed into a cylindrical heater part 11, and the terminal end of the C/C material is formed into a terminal to which an electrode member 20 is bonded, with the terminal 12 having a width larger than that of the heater part. Hence, the electric resistance of the terminal part 12 is reduced, resulting in a reduction in self calorific value and an extension of heat releasing area, whereby a rise in temperature can be prevented. As the C/C material is light- weighted, excellent in heat resistance and heat and electric transmitting property, and reinforced by carbon fiber, elasticity and mechanical strength are improved. Further, the heating element 10 is directly connected to the electrode member 20 with a bolt to facilitate the connecting work.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat generating device used in an electric furnace, etc.
In particular, the present invention relates to a heat generating device with a compact structure that enables miniaturization of electric furnaces and the like.

[Prior Art] Conventionally, a heat generating device used in an electric furnace or the like that performs heating by converting electrical energy into thermal energy has generally been supported on the furnace body side.

The heating element in this heating device is carbon.

The heating element is made of carbon such as taraphite or silicon carbide filament material, and is relatively heavy and brittle, so the heating element must be firmly supported and fixed to the furnace body etc. via supporting means. It was because he had to.

As described above, conventional heating units are relatively heavy and fragile, so they must be supported by a solid structure, that is, by the furnace body.

In addition, a heating element is supported by a supporting means.

Heat escapes by thermal conduction through this support means,
It is necessary to take various heat shielding measures to prevent heat conduction through the support means, since this causes power loss, reduces economic efficiency, and causes uneven heat generation, which adversely affects the sample. In this case, unless there is a large space such as on the furnace body side, it is not possible to effectively take heat shielding measures such as filling with heat shielding material.

[Problems to be Solved by the Invention] As mentioned above, the heat generating devices in conventional electric furnaces, etc. have to be attached to the furnace body etc. via supporting means due to the heavy and brittle nature of the heating element. Ta.

For this reason, the design of electric furnaces, etc. that use heat generating devices.

In addition to creating various constraints during production, it has been difficult to reduce the size and weight of electric furnaces and the like.

The present invention has been made in view of the above-mentioned problems.
The object of the present invention is to provide a heat generating device that can not only reduce the weight and size of the heat generating device itself, but also reduce the weight and size of an electric furnace using this heat generating device and increase the degree of freedom in designing and manufacturing.

[Means for Solving the Problems] In order to achieve the above object, the heat generating device of the present invention has a structure in which a heat generating element made of a carbon fiber-reinforced carbon composite material is attached to a base plate of an electric furnace or the like.

Further, if necessary, a sample stage is attached to the base plate together with a heating element.

[Function] The heat generating device of the present invention configured as described above has a compact structure in which the heat generating element (and sample stage) is attached to the lid side of an electric furnace or the like.

[Example] Hereinafter, an example of the heat generating device of the present invention will be described with reference to the drawings.

Fig. 1 is a front view of the heat generating device of the first embodiment, Fig. 2 is a front view of the heat generating device of the second embodiment, Fig. 3 is an enlarged side view of the joint between the terminal of the heating element and the electrode member, and Fig. 4 shows a sectional view of an electric furnace using the heat generating device of the second embodiment.

In FIG. 1, reference numeral 10 denotes a heating element, which is made of carbon fiber-reinforced carbon composite material (C/C composite: hereinafter referred to as C/C material). This heating element 10 has a rectangular wave shape by cutting slits into a C7C material, and the entire body is formed into a cylindrical heater part 11, and the end of the C/C material is used as a terminal 12 to which an electrode member 20 is joined. . The width of this terminal 12 is wider than that of the heater section 11.

When the terminal portion 12 is made thicker than the heater portion 11, the terminal portion 12
The electrical resistance of the heat sink becomes smaller, the amount of self-heating decreases, and the heat dissipation area becomes wider, making it possible to prevent a rise in temperature.

Since C/C materials are made entirely of carbon, they fully utilize the advantages of carbon materials, such as light weight, heat resistance, and heat and electricity conductivity.In addition, they have been reinforced with carbon fibers, making them highly elastic. It has improved mechanical strength, and is much stronger than steel, especially at high temperatures.

Therefore, the heating element IO formed of C/C material also
Having all of these excellent properties, the heating element itself can be formed extremely thin (for example, lam thick). Furthermore, by making the heating element IO thin, the weight can be extremely light (for example, 50 g).

The electrode member 20 is connected to each terminal 12 of the heating element 10 to supply power to the heater 12 of the heating element 11 (only one electrode is shown in FIG. 2).

This electrode member 20 has a shallow groove 22 at the bottom of the joint portion 21 and a side surface shaped like a 10-hand shape. This groove 2
2 has a width slightly larger than the thickness of the terminal 12 of the heating element 10. Therefore, when joining the heating element 10 and the electrode member 20, in the groove 22 of the joining part 21 of the electrode member 20,
By engaging the terminal 12 of the heating element IO, the terminal 1
2 and the joint portion 21 and temporarily fasten them. This facilitates the work of joining the heating element IO to the electrode member 20.

Reference numeral 13 indicates a bolt hole provided at the terminal 12 of the heating element lO, and reference numeral 23 indicates a bolt hole provided at the joint portion of the electrode member 20. By inserting bolts (not shown) into these bolt holes 13 and 23 and tightening them, the heating element is removed. Electrical and amechanical bonding between IO and the electrode member 20 is achieved.

Further, reference numeral 30 denotes a base plate made of stainless steel or the like, and is supported by a plurality of pillars 31. This base plate 30 has a substantially circular top, and has four protrusions 32 fixed to its outer peripheral side at intervals of 90 degrees. Further, the electrode member 20 is fixed at a position off the center of the base plate 30.

Thereby, the heating element 10 is supported by the base plate 30 only via the electrode member 20.

FIG. 2 shows an embodiment of a heat generating device in which a sample stage is fixed together with a heat generating element.

In the heat generating device of the second embodiment, a thermometer 50 having a built-in thermocouple is fixedly attached to the base plate 30 approximately in the center thereof. The sample stand 40 is fixedly attached to the upper end of the thermometer 50, and a sample 41, such as steel, ceramics, glass, plastic, etc., is placed on the upper part of the sample stand 40. It is.

Further, the above-mentioned cylindrical heating element 10 is placed around the sample 41.
is arranged.

Next, an example of an electric furnace using the heat generating device of the second embodiment will be described with reference to FIG. 3.

In the same figure, 1 is a heat shielding board, and the base plate l
It is fixed to the upper end of the support column 2, which is fixed at a position off the center of the column. Although only one pillar 2 is shown in FIG. 1 for convenience, in reality, a plurality of pillars 2 are provided in order to reliably support the heat shielding substrate l.

A heat shield plate 3 is fitted into the heat shield board l. The heat shield plate 3 is formed by stacking three cylindrical members (open at the lower end and closed at the upper end). These cylindrical members are made of C/C material like the heating element IO. The heat shield plate 3 covers the heat generating element 10 and serves to prevent the heat emitted from the heat generating element 10 from further being emitted to the outside, thereby increasing thermal efficiency.

In addition to the heat shield plate 3 described above, the heat shield board l includes the heat shield plate 3.
A heat insulating case 4 is attached so as to cover the. This heat insulating case 4 aims to further improve thermal efficiency.

Further, the heat insulating case 4 is located above the base plate 30.
An inner shell 5 made of metal such as aluminum is arranged on the outside. This inner shell 5 is for creating a vacuum inside.

An exhaust duct 6 is attached to the right side of the base plate 30, and a vacuum pump (not shown) is attached to this duct 6.
are connected. When the above vacuum pump is operated with the inner shell 5 placed on the base plate 1,
The air inside the inner shell 5 is sucked in and a vacuum is created inside it.

As shown in the figure, the connecting surface between the inner shell 5 and the base plate 3o is an inclined surface that widens downward in the figure. As air is removed through the exhaust duct 6, the inner shell 5 is pushed against the base plate 30 by atmospheric pressure.
be forced to.

An inner cylindrical outer case 7 is disposed outside the inner shell 5. This outer case 7 extends further below the base plate l, and is provided with a blower fan 8 on its bottom surface. When the blower fan 8 operates, the inner shell 5
Air flows through the gap between the shell 5 and the outer case 7, cooling both the inner shell 5 and the outer case 7.

In an electric furnace having such a configuration, the base plate, which functions as a lid, is fixed, and the inner shell, which functions as a furnace case, is removable.

As is clear from the above configuration, in the single heat generating device, the heating element 10 is attached to a base plate 30 such as a lid. Moreover, it is attached only through the electrode member 20, and no special support means is provided separately.Therefore, it goes without saying that the heat generating device itself can be made lighter and smaller.

It is also possible to reduce the weight and size of an electric furnace using this heating device, and to increase the degree of freedom in designing and manufacturing.

Moreover, since the heat generating device 8, the heat generating element 10 and the base plate 30 are integrally constructed, the base plate has a standardized flange structure (for example, an ICF flange).
By doing so, this heat generating device can be freely attached to any container.

Additionally, the assembly work and maintenance of the electric furnace become easier.

In the heat generating device of the above embodiment, the shape of the heat generating element was explained as a rectangular wave shape by cutting slits in the C/C material, and a cylindrical shape as a whole, but the shape of the heat generating element is limited to this. If it is a shape that can be processed using C/C material, such as a disc shape or a multifaceted shape,
Including things of various shapes.

In addition, when the sample stage is attached to the base plate together with the heating element, it is possible to further reduce the weight and size of the electric furnace and the like.

Furthermore, it goes without saying that the apparatus 1 and the like that can utilize this heat generating device are not limited to the above-mentioned electric furnace.

[Effects of the Invention] As described above, since the heat generating device of the present invention has a structure in which the heat generating element is attached to the base plate, it has the effect that the structure is extremely compact.

[Brief explanation of drawings]

Fig. 1 is a front view of the heat generating device of the first embodiment, Fig. 2 is a front view of the heat generating device of the second embodiment, Fig. 3 is an enlarged side view of the joint between the terminal of the heating element and the electrode member, and Fig. 4 shows a sectional view of an electric furnace using the heat generating device of the second embodiment. : Heating element 20: Electrode member 30: Base plate 40: Sample stage sample

Claims (1)

[Claims] A heat generating device characterized in that a heating element made of carbon fiber reinforced carbon composite material is attached to a base plate of an electric furnace or the like.