JPS5850633Y2 - Three-dimensional mesh skeleton heating element device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating element device having a three-dimensional mesh skeleton.

Conventionally, ceramic heating elements for the purpose of heat exchange are Ba.
TiO3-based semiconductor porcelain is used, but each piece can generate only a few watts of heat, and in order to increase the heat output, it requires installation on a large heat sink or multiple pieces of positive characteristic porcelain. Therefore, the heating element became large and uneconomical.

Also, attempts were made to increase the calorific value by increasing the surface area by making it cylindrical, but this resulted in an extremely large volume and was impractical.

Therefore, we constructed a heating element using a positive temperature coefficient thermistor porcelain having many through holes like the honeycomb structure with 9 holes in Figure 1A.
A heat generating device in which liquid or gas flows through the through hole is known from Japanese Patent Publication No. 48815/1983 and has been put into practical use.

Also, the harmonica type shown in Figure 2 has been put into practical use, but all of them have drawbacks such as the high cost of molds, manufacturing equipment, and assembly work associated with molding the porcelain.To solve this problem, polyurethane, It is possible to obtain a ceramic body using polyester, polyether, Japanese paper, or the like as a base and having a mesh-like molded body similar to that shown in FIG. 3 and having a three-dimensional skeletal structure.

That is, a barium titanate-based semiconductor ceramic composition that exhibits positive resistance-temperature characteristics is calcined, crushed into fine powder, and immersed in a slurry made by mixing with water or a binder to form a three-dimensional network. A slurry is applied to the skeleton of a molded body, dried, and fired at a temperature of 1300°C for 2 hours to form a hard mesh crosslinked structure with a random shape similar to that of the molded body, as shown in Figure 4, and having a three-dimensional space. Although a ceramic body was obtained, due to its random crosslinked structure, it is extremely weak against external stress, and a part of the structure is easily destroyed, resulting in a drawback in holding the heating element.

Furthermore, the surface of the heating element has large irregularities, and there is no flat part as seen in ordinary disc-shaped ceramic elements, which causes problems in contacting the electrodes with the external lead terminals.

The present invention provides a three-dimensional mesh skeleton heating element device that eliminates the above-mentioned drawbacks, and has a plurality of three-dimensional mesh skeleton heating element elements having positive resistance-temperature characteristics, long hole windows, and facing Two terminal frames each having tongues provided at regular intervals on the long sides thereof are placed face to face, and the tongues provided between the long holes of the terminal frames and the heating element electrode are bonded with conductive paste. It is a heating element device that is connected and fixed with a plurality of low-power heating elements to easily obtain the desired amount of heat, and it also adheres to the terminal frame on many surfaces to reduce current density. At the same time, mechanical strength is also increased.

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in FIGS. 3, 4, and 5. FIG. 3 is a plan view of a polyurethane foam having a three-dimensional skeleton structure, and FIG. The polyurethane foam shown in the figure is immersed in a slurry of a barium titanate-based semiconductor ceramic composition, dried, and fired to form a hard network cross-linked structure with a random shape similar to the polyurethane foam shown in Figure 3. FIG. 5 shows a partially enlarged view of a ceramic body having a space, and FIG. 5 shows a plurality of heating elements having electrodes 2 formed on two opposing sides of the ceramic body 1 shown in FIG. It is a frame body, and tongue pieces 5 are provided on opposing long sides 4 at regular intervals.

This heating element device has a three-dimensional mesh skeleton in which two terminal frames 6 are placed face to face, a heating element is inserted between the terminal frames 6, and the electrodes 2 and tongue pieces 5 are connected and fixed with conductive paste. .

In addition, in the above embodiment, a plurality of heating elements were used, but
The scope of application is determined based on the quality and cost aspects of the manufacturing process of the heating element. In the above example, polyurethane foam was cut into 38 x 24 x 10 mm, and a positive temperature coefficient thermistor slurry with a cue point of 220°C was used. After repeating immersion in the material and drying six times, the ceramic body 11 is obtained by sintering at 1280°C.
A silver electrode was applied to the surface and in ventilation at a wind speed of 9 m/s,
When a voltage of 100 VAC was applied between the two electrodes, 100
The one that gave an output of W was used.

The heat generating device of the present invention is provided with a tongue piece 5 on the long side of a terminal frame body 6 having a long hole window, and the tongue piece 5 and the electrode 2 of the heating element are connected and fixed with a conductive paste. A tongue piece 5 is provided on the long side of the terminal frame body 6, and each tongue piece 5 is adhered to the electrode 2 of each independent heating element, so that the metal terminal frame body 6 absorbs the heat generated by the heating element or the surrounding heat. Even if there is thermal expansion due to changes, there is little mechanical stress on the heating element.

Therefore, there is no damage to the electrode portion or electrodes of the heating element.

Further, depending on the range of application, the required output may be a collection of heating elements, and the size and shape of the heating elements can be made constant to simplify manufacturing.

[Brief explanation of drawings]

Figure 1 shows a conventional honeycomb structure heating element, A is a perspective view,
The opening is a partially enlarged perspective view of A, Fig. 2 is a perspective view of a heating element with a conventional harmonica structure, Fig. 3 is a front view of polyurethane foam, Fig. 4 is a partially enlarged view of a heating element with a three-dimensional mesh skeleton, FIG. 5 shows a three-dimensional mesh skeleton heating element device of the present invention. 1: Ceramic body, 2: Electrode, 3: Long hole window, 4: Long side portion, 5: Tongue piece, 6: Terminal frame body.

Claims (1)

[Scope of utility model registration request] Two terminal frames each having a long hole window and tongue pieces provided at a constant interval on opposing long sides are placed face to face, and a three-dimensional mesh skeleton structure is formed between the long holes of the terminal frame. 1. A heating element device having a three-dimensional mesh skeleton, characterized in that a plurality of positive temperature coefficient thermistors having a plurality of positive temperature coefficient thermistors are arranged, and a tongue piece and a positive coefficient thermistor electrode are connected and fixed with a conductive paste.