JPH07155545A - Production of deodorizing device - Google Patents

Abstract

PURPOSE:To reduce the cracking of a deodorant catalyst on a glass enamel layer and to prevent the peeling of the deodorant catalyst layer by setting a calcining temp. less than a glass transition temp. of the glass enamel layer. CONSTITUTION:A metallic substrate 2 is integrated thermally to a heat generating body 1, and the glass enamel layer 3 is applied on this metallic substrate 2 and the deodorant catalyst layer 4 is applied thereon. Then, in a calcining furnace, this material is calcined at a temp. less than the glass transition temp. of the glass enamel layer 3. In this way, the cracking of the deodorant catalyst layer 4 on the glass enamel layer 3 is reduced, and consequently, the peeling of the deodorant catalyst layer 4 is prevented. Roughness of the glass enamel surface is preserved, adhesion of the deodorant catalyst layer 4 is also preserved and the peeling of the catalyst layer 4 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing method for an air conditioner.

[0002]

2. Description of the Related Art When burning a deodorizing catalyst that removes odorous components from the air, it is easier to sinter the catalyst components such as alumina and silica at higher temperatures, while firing at a lower temperature causes electrical insulation of the heating element. May be incompletely dried. For this reason, conventionally, the firing temperature has been considered to be as high as possible, and the temperature has been around the upper limit at which the deodorizing catalyst does not change.

[0003]

However, at the conventional firing temperature, the internal energy, entropy, etc. of the glass enamel do not change, and the specific heat, expansion coefficient, compressibility, etc., exceed the glass transition temperature which changes discontinuously. Therefore, the difference in the coefficient of thermal expansion between the glass enamel and the deodorizing catalyst becomes large, and the deodorizing catalyst layer does not follow the elongation of the glass enamel layer, and the resulting tensile stress causes the deodorizing catalyst layer to crack, resulting in the glass enamel layer There is a problem that the adhesion of the deodorizing catalyst layer is reduced, the deodorizing catalyst layer is peeled off, and the peeled deodorizing catalyst is discharged from an air conditioner incorporating a deodorizing device. The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to improve the adhesion between the deodorizing catalyst layer and the glass enamel layer by optimizing the firing temperature of the deodorizing device. It is a thing.

[0004]

In order to solve the above-mentioned problems, the present invention sets the firing temperature of the deodorizing device to be equal to or lower than the glass transition point of the glass enamel.

[0005]

[Function] By controlling the firing temperature to be equal to or lower than the glass transition temperature of the glass enamel and reducing the difference in elongation between the glass enamel layer and the deodorizing catalyst layer, the deodorizing catalyst layer can be prevented from peeling due to a decrease in adhesion.

[0006]

EXAMPLE An example of the present invention will be described below.

FIG. 1 shows the configuration of a deodorizing device manufactured by the method for manufacturing a deodorizing device of the present invention. Reference numeral 1 is a heating element, 2 is a metal base material that is thermally integrated with the heating element 1, 3 is a glass enamel layer applied on the metal base material, 4 is a deodorizing catalyst layer applied on the glass enamel layer Is.

After applying the deodorizing catalyst layer 4, in a firing furnace,
Firing is performed at a temperature T that is equal to or lower than the glass transition temperature Tg of the glass enamel layer 3. When the firing temperature at this time exceeds Tg which is the glass transition temperature of the glass enamel layer, the coefficient of thermal expansion of the glass enamel rapidly increases as shown in FIG. 2 and the difference from the thermal expansion of the deodorizing catalyst layer 4 becomes very large. growing. Therefore, the deodorizing catalyst layer 4 receives a large tensile stress, but since the deodorizing catalyst layer 4 is a ceramic, it is weak against the tensile stress. Therefore, countless cracks are generated in the deodorizing catalyst layer 4, and the adhesion strength of the deodorizing catalyst layer 4 to the glass enamel layer 3 is significantly impaired. However, since this firing step also serves as a drying step for obtaining the electric insulation resistance of the heating element 1, if the firing temperature is unduly lowered, the heating element cannot obtain a sufficient electric insulation resistance, Poor electrical insulation may result. Therefore, it is necessary to utilize as high a temperature as possible without exceeding the glass transition temperature Tg. Therefore, in the present invention, firing is performed at a glass transition temperature Tg or lower and at a temperature as high as possible. By setting the firing temperature to the glass transition temperature or lower as described above, the adhesion strength of the deodorizing catalyst layer 4 can be increased. In addition, since the firing temperature was set to the glass transition temperature or higher, the surface roughness of the glass enamel layer 3 which was used to improve the adhesion of the deodorizing catalyst was smoothed by softening the glass enamel layer. However, the roughness can be maintained by lowering the firing temperature, and the adhesion strength with the deodorizing catalyst layer can be increased.

[0009]

As described above, in the present invention, cracking of the deodorizing catalyst with respect to the glass enamel layer can be reduced by setting the firing temperature to the glass transition temperature of the enamel or less, and as a result, peeling of the deodorizing catalyst layer can be prevented. It can be reduced. Further, since the roughness of the glass enamel surface can be maintained, the adhesion of the deodorizing catalyst layer can be maintained, and this can also prevent peeling of the deodorizing catalyst layer.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a deodorizing device according to an embodiment of the present invention.

Fig. 2 Thermal expansion curve diagram of glass enamel

[Explanation of symbols]

 1 Heating Element 2 Metal Substrate 3 Glass Enamel Layer 4 Deodorizing Catalyst Layer

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Mariko Kawakatsu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A heating element, a metal substrate thermally integrated with the heating element, a glass enamel layer formed on the metal substrate, and a deodorizing catalyst formed on the glass enamel layer. A method for producing a deodorizing device, comprising forming a deodorizing device with a layer, and firing the deodorizing device at a temperature not higher than the glass transition temperature of the glass enamel layer.