JPS6230792Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a honeycomb-shaped heating element unit using a positive temperature coefficient thermistor (PTC thermistor).

A positive temperature characteristic thermistor has the characteristic that its resistance increases rapidly above the Curie temperature, and by taking advantage of this characteristic, it is put into practical use as a temperature sensor, current limiting resistor, or heating element. .

Furthermore, in recent years, a honeycomb-shaped heating element having a honeycomb structure in which a positive temperature coefficient thermistor is provided with a large number of through holes has been developed as a source of hot air.

By the way, conventional honeycomb-shaped heating elements of this type have a disk-like outer shape, and if the diameter exceeds about 5 cm, they are susceptible to cracks and are virtually impossible to manufacture. Further, since the outer shape is disc-shaped, it is difficult to expand the area by combining a plurality of them.

In view of the above points, the present invention aims to provide a honeycomb-shaped heating element unit with a large area and a large amount of heat generation by forming a honeycomb-shaped heating element of a positive temperature coefficient thermistor into a rectangular plate shape and combining a plurality of these. That is.

Embodiments of the honeycomb-shaped heating element unit according to the present invention will be described below with reference to the drawings.

In FIG. 1, a square plate-shaped positive temperature coefficient thermistor 1 has a large number of through holes 2 formed therein except near the outer periphery. Then, as shown in FIG. 2, electrodes 3 and 4 are formed on both surfaces (front and back surfaces) of the positive temperature coefficient thermistor 1 having the through holes 2 by printing and baking silver paste or thermal spraying aluminum, so that the outer shape is a rectangular plate. A honeycomb-shaped heating element 5 is constructed. Note that the electrodes 3 and 4 have extension connection portions 3A and 4A extending to the side surfaces of the PTC thermistor 1, respectively. Such a honeycomb-shaped heating element 5 having a rectangular plate-like outer shape has a heat output of about 500 W each, and a plurality of these are combined so that the side surfaces are in close contact with each other, and a heat-resistant fastener 6 is used. It is integrated with.

According to the above embodiment, by combining a plurality of rectangular plate-shaped honeycomb heating elements 5, it is possible to easily construct a honeycomb heating element unit with a large area and a large amount of heat generation. Further, by increasing or decreasing the number of heating elements 5, a device with an arbitrary area can be obtained. Furthermore, since the vicinity of the outer periphery of each honeycomb-shaped heating element 5 constitutes a partition wall 7 without any through holes, it is possible to prevent cracks from occurring when the heating element is enlarged.

Note that the electrode extension connecting portions 3A and 4A may be connected and integrated by brazing or the like. Further, the shape of the through hole 2 may be any shape such as a quadrangle, a hexagon, or a circle.

As mentioned above, according to the present invention, a honeycomb-shaped heating element of a PTC thermistor is formed into a rectangular plate shape, and by combining a plurality of these, a honeycomb-shaped heating element unit with a large area and a large calorific value can be created. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a honeycomb heating element unit according to the present invention, and FIG. 2 is a sectional view of each honeycomb heating element used in the embodiment. 1...Positive characteristic thermistor, 2...Through hole, 3,
4... Electrode, 5... Honeycomb-shaped heating element, 6... Fastener, 7... Partition wall.

Claims (1)

[Scope of utility model registration request] A partition wall 7 near the outer periphery of the positive temperature coefficient thermistor 1
A large number of through-holes 2 are formed except for the portions shown in FIG. A honeycomb-shaped heating element 5 having a rectangular plate-like outer shape is constructed by having extension connecting portions 3A and 4A extended to 300 mm, and a plurality of honeycomb-shaped heating elements 5 are assembled with heat-resistant fasteners so that their side surfaces are in close contact with each other. A honeycomb-shaped heating element unit characterized by being integrated with an attachment 6.