JPS601508Y2 - Ceramic heater device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a ceramic heater device using a ceramic heater such as barium titanate semiconductor ceramic.

Conventionally, as this type of device, configurations as shown in FIGS. 1 and 2 have been put into practical use.

In the figure, 1 is a disc-shaped ceramic heater element with electrodes attached to a barium titanate semiconductor with positive characteristics, and 2
3 is a thin metal electrode plate for electrical connection, 3 is a lead wire attached to the electrode plate, 4 is a high alumina porcelain plate that serves both electrical insulation and heat conduction, and 5 is a fastener. Figure 2 shows these parts. 1 to 4 are stacked one on top of the other in the order shown in FIG. 1, and assembled in a sandwiched state with the fasteners 5, as shown in FIG.

However, the above mechanism has disadvantages in that the alumina porcelain plate 4 may be damaged when the temperature rises or when the heater is assembled into a product, and assembly is troublesome.

This invention attempts to improve the above-mentioned drawbacks.

An embodiment of this invention will be described with reference to FIGS. 3 and 4.

In the figure, 6 is a disc-shaped ceramic heater element in which electrodes 7 are formed on both sides of a barium titanate-based semiconductor with positive characteristics by silver plating over Ni plating or aluminum spraying, and 8 is a ceramic heater element with one side concave and one side A metal plate made of brass, for example, with a flat surface, 9 a Ni-plated electrode surface provided at the bottom of the recess of the metal plate 8, 10 an alumina insulating part provided by thermal spraying on the flat part of the metal plate 8, 11 is a lead wire attached to the electrode surface 9, and 12 is a stopper.

The heater element 6 is housed between the recesses of two metal plates 8 as shown in FIG. By fixing them in close contact, it can be used as a heater device.

When this heater device is attached to a heating device (not specified in the figure) and an alternating current is supplied through the lead wire 11, the current is uniformly supplied to the heater element through the electrode 9.
generates a fever.

This heat is conducted to the equipment through a metal plate.

The alumina insulating section 10 was provided to insulate the equipment and the heater element 6.

According to this invention, since a metal plate is used and the metal plate is sprayed with alumina, the insulation part will not be damaged, and since the electrode surface is formed on this metal plate, the number of parts will be reduced. It is easy to assemble.

Furthermore, since there are fewer parts, there is good adhesion and less heat loss.

In the above embodiment, the metal plate that holds the heater element has a concave portion on the side that forms the electrode surface, but this may also be a flat plate, and the concave portion is used for positioning the heater element. Although it is advantageous in terms of
3, it is possible to obtain similar effects.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a conventional heater device, FIG. 2 is a sectional view of the assembled state, FIG. 3 is an exploded perspective view of a heater device according to an embodiment of the invention, and FIG. 4 is an exploded perspective view of the assembled state. The sectional view and FIG. 5 are perspective views of a metal plate used in another embodiment of this invention. In the figure, 6 is a heater element, 8 is a metal plate, 9 is an electrode surface, 1
0 is an alumina insulation part.

Claims (1)

[Scope of utility model registration request] A ceramic heater device characterized in that a plate-shaped ceramic heater element is sandwiched between two metal plates having electrode surfaces with lead wires attached to the opposing inner surfaces and alumina sprayed on the outer surfaces. .