JPS64716Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a silicon carbide heating element consisting of a heating part and a terminal part.

Traditionally, silicon carbide heating elements have been given names such as rod-shaped, U-shaped, spiral-shaped, circular, etc., depending on the shape of the heating part connected between both terminals, and the optimum heating element can be found by taking advantage of the characteristics of each. It is put into practical use. The heating element has a general purpose of inserting a plurality of them into a heating furnace or the like to raise the temperature in the furnace chamber and heat-treating the processed material;
A small object is brought close to or inserted into the outer surface of a single heating element or the inner space of a cylindrical body for a short time,
There are special uses in which the processed material is subjected to local heating, fusing, sealing, or melt molding.

Conventionally, short cylindrical heating elements have been used as heating elements for special purposes, such as sealing or melting molding of small parts such as vacuum tubes and cameras with glass or metal, and short-time heat treatment operations. Generally, the inside of the heating element is used as a heating zone, but the heating element needs to be safe and easy to move the processed material into and out of the inside, so the position structure of the terminal part is It often affects the productivity of processing operations. Therefore, the terminal part is generally a single terminal type with both terminals on one side, but the structure of the heat generating part is therefore a U-turn shape with a vertical structure cut in the center of the cylinder, or a double spiral groove. A cut spiral shape is used. However, the inner diameter and cylindrical height of the heating element of this shape are determined by the shape of the object to be processed, but the applied power has to be balanced with the shape of the heating element, so it tends to be too much power, making it uneconomical. In addition, the heating element is not only incapable of local heating in one place or two or more places at the same time because of the long uniform heat generation length, but also because it is a single terminal type, it is difficult to assemble the front and rear insertion devices. The disadvantage is that there are many troubles in installation and operation.

The purpose of the present invention is to bond a plurality of circular or rectangular heat generating parts to both vertically long plate-shaped terminal parts at arbitrary intervals in the upper and lower stages, that is, the external shape is different from that of the conventional single terminal type. Unlike this, by gluing the terminals parallel to and adjacent to the heat-generating section, it is possible to apply arbitrary power and heat multiple localized areas at the same time, and there is no operational trouble due to the position of the terminals, and in addition, production is easier. An object of the present invention is to provide a silicon carbide heating element with excellent properties.

That is, the composite heating type silicon carbide heating element according to the present invention has a plurality of heating parts each having a circular or rectangular cross section and a ring or rectangular external shape arranged at appropriate intervals on both vertically long plate-shaped terminal parts. It is characterized by a structure obtained by gluing the upper and lower layers at almost right angles.

Embodiments of the present invention will be described below with reference to the drawings. Figures 1 and 2 are front views showing an embodiment of the present invention.
FIG. 3 is a plan view of FIGS. 1 and 2. FIG. That is, the embodiment consists of a heat generating part 1 having a rectangular cross section and a ring shape in appearance, and a vertically long plate-shaped terminal part 2 sandwiching an insulating plate 3. It has a structure in which it is glued from the end to the top and bottom at equal intervals or at arbitrary intervals depending on the purpose.

Next, the embodiment of the present invention shown in Fig. 1 has a rectangular cross section of 6 mm x 7.5 mm, an annular external shape, and an outer diameter.
14 silicon carbide heating parts with a diameter of 95 mm and an inner diameter of 80 mm are glued at equal intervals to a plate-shaped terminal part 2, which is also made of silicon carbide and has a length of 60 mm, a width of 25 mm, and a thickness of 15 mm. Then, power with a voltage of 40V and a current of 50A is applied to the heating element obtained by sandwiching the 10mm thick insulating plate 3.
By applying 2 kW, a composite heating type silicon carbide heating element was obtained in which each heating part uniformly heated to 1000°C in the air. Furthermore, in the present invention shown in FIG. 2, 12 heat generating parts having the same shape and quality as the heating element shown in FIG. Power to the body, voltage 40V, current 25A
By applying 1 kW, a composite heat-generating silicon carbide heating element having heating parts of 1000°C in the air at the upper and lower ends was obtained.

As mentioned above, unlike the conventional short cylindrical single terminal type heating element, the present invention uses multiple heat generating parts with arbitrary cross sections and external shapes to suit the shape of the object to be processed and the same amount of power. By arbitrarily adhering to the terminal length according to the heating area or simultaneous sealing area, it eliminates the drawbacks of conventional heating elements, namely, the excessive power, making it impossible to adjust the heating area and the area, and the single terminal type device. In addition to the above troubles, we were able to solve problems such as low productivity all at once. Furthermore, as an effective application of the present invention, for example, when a material to be treated is heat-treated in a furnace core tube having a specific temperature gradient, the intervals between the plurality of heat generating parts are determined according to the desired temperature gradient, and a long It is also possible to easily obtain a tubular furnace with an arbitrary temperature gradient by inserting the furnace core tube inside the heating element of the present invention obtained by adhering to the terminal portion.

As described above, the present invention provides a heat generating section of a heat generating element obtained by, for example, cutting a part of a short cylindrical body vertically to form a heat generating section, and bonding both plate-shaped terminal sections in parallel to the heat generating section. The basic structure of the idea of this invention is a structure consisting of a space part and a heat generating part obtained by cutting into a ring shape of arbitrary thickness and dropping it appropriately, but in the actual manufacturing process, multiple pieces manufactured separately are The structure of the present invention, which is obtained by bonding a ring-shaped heating part to both vertically long plate-shaped terminal parts, is easier to process, cheaper, and has more stable characteristics.
It was found that this is advantageous in terms of manufacturing.

[Brief explanation of drawings]

1 and 2 are front views showing an embodiment of the present invention, and FIG. 3 is a plan view of FIGS. 1 and 2. FIG. 1... Heat generating part, 2... Terminal part, 3... Insulating plate.

Claims (1)

[Scope of utility model registration request] A heating element made essentially of silicon carbide, with a plurality of heating parts each having a circular or rectangular cross section and a ring or rectangular external shape arranged in upper and lower stages on both vertically long plate-shaped terminal parts. A composite heating type silicon carbide heating element bonded at right angles.