JPH0614888B2 - Heating cooker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker capable of continuously removing stains generated during cooking and adhering to the inner wall of a heating chamber during cooking.

BACKGROUND ART Conventionally, a heating cooker such as an oven having a self-cleaning function (hereinafter referred to as a heating cooker) is a enamel coating layer containing manganese dioxide as a main catalyst component on the inner wall surface of a metal plate that constitutes a heating chamber. Or a type having a so-called catalyst coating layer formed with a heat-resistant coating coating layer using a binder such as silicon resin instead of enamel, or a metal separate from the inner wall surface of the heating chamber. There is known a type in which a purifying plate having the above-mentioned catalyst coating layer is attached to the surface of the plate, and when the purifying ability for dirt is lost, it can be removed and replaced with a new purifying plate.

Problems to be Solved by the Invention Since the catalyst coating layer of the conventional heating cooker having a self-cleaning function uses the metal plate as the carrier of the catalyst coating layer, the surface of the catalyst coating layer should not come into contact with air. When the dirt that blocks is adhered, the supply of oxygen to the catalyst coating layer is blocked, so that the purifying ability sharply decreases or disappears, and there is a problem in its durability. Further, in the case of heating with a heating element having a limited electric capacity such as a heating cooker, the heating chamber in which the catalyst coating layer is formed or the purification plate itself has a large heat capacity, and in addition, the catalyst coating layer itself. Since the thermal conductivity of is smaller than that of metal, it is difficult to quickly and uniformly raise the entire inner wall surface or the purification plate to a temperature sufficient to exert the purification ability, and a satisfactory purification effect is obtained. I couldn't.

Further, the effect of reflecting infrared rays generated from the heating element during cooking can hardly be expected, and it is not suitable for cooking (for example, toast) that requires the surface to be burnt in a short time.

The present invention solves such problems, and an object thereof is to provide a heating cooker including a purifying body having excellent durability, which is excellent in purifying dirt such as oils and fats generated from cooked foods. To do.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a housing, a heating chamber that is internally provided in the housing, and has a heating element provided therein, and the heating chamber. And a planar self-cleaning body mounted on the inner wall surface of the sheet, wherein the planar self-cleaning body is a metal of an inorganic porous body,
The catalyst is supported on a catalyst supporting member having continuous pores that are permeable in all directions inside, such as a fibrous aggregate made of ceramic, glass or a composite of these, a foam, a porous laminate, and a papermaking machine, It is composed of a catalyst-carrying substrate which is superposed on the reinforcing body.

The heating cooker of the present invention comprises a catalyst-carrying substrate for supporting the catalyst component of the planar self-cleaning body with a member having air permeability in all directions inside, and the planar self-purifying body is used as a heating chamber. Since it is mounted on the inner wall surface, the heated air heated by the heating element can freely move in and out of the planar self-cleaning body, and can flow freely inside the planar self-cleaning body. This will heat it evenly. In addition, the catalyst purification effect is improved by eliminating unevenness depending on the part, and even if significant stains from cooked food are locally adhered, sufficient oxygen is supplied from the periphery and the back surface of the stains to improve the catalyst purification action. Therefore, the surface self-cleaning body does not have stains left on it, and therefore excellent durability can be obtained.

Further, when the catalyst-supporting substrate is made of metal, the infrared ray emitted from the heating element can also be reflected.

Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a side sectional view of a heating cooker according to the present invention. Reference numeral 1 is a planar self-cleaning body in which a catalyst component is supported on a catalyst-supporting substrate having air permeability in all directions inside. It is internally mounted and mounted on the inner wall surface of the heating chamber 2 in which the heating element 3 is arranged.

Here, an example of the catalyst-supporting substrate of the planar self-purifying body will be described with reference to FIGS. 2 and 3.

FIG. 2 shows an exploded perspective view of a catalyst-supporting substrate. Reference numeral 11 denotes a catalyst-supporting member having continuous pores that are permeable to air in all directions inside, for example, an inorganic porous metal, ceramic, glass or a composite thereof. It is composed of a breathable member such as a fibrous aggregate, a foam, a porous laminate, or a papermaking machine. 12, 12 and 13 are breathable reinforcing members, and are made of breathable members such as laths, wire nets or bunching metals. The catalyst supporting member 11 and the reinforcing bodies 12 and 13 are stacked in a sandwich structure with the catalyst supporting member 11 as a core, and the catalyst supporting member 11 and the reinforcing members 12 and 13 are joined together by a suitable method such as pressure welding or welding.
As shown in the figure, they are integrated to form a catalyst supporting base 1a.

The catalyst-carrying member 11 of this construction has a property of being brittle against external force and may be damaged or destroyed by taking in and out of a grill, a saucer or the like. Is covered with the reinforcing bodies 12 and 13 to prevent this.

Next, another example of the catalyst-supporting substrate will be described with reference to FIGS.
It will be described with reference to the drawings.

FIG. 4 is an exploded perspective view of the catalyst-supporting substrate, and 14 is a breathable reinforcing member, which is made of a breathable member such as lath, wire mesh or punching metal. 1
Reference numerals 5 and 16 denote metallic catalyst-supporting members having continuous air-permeable pores in all directions inside, for example, woven fine metal wires of aluminum, nickel, stainless steel or the like in a woven cloth shape, a porous metal foam body, It is composed of a metal member having air permeability such as a metal fiber mat. These reinforcements 1
4, the catalyst supporting members 15 and 16 are superposed in a sandwich structure with the reinforcing body 14 as a core, and integrated as shown in FIG. 5 by an appropriate method such as pressure welding or welding.
a is formed.

The catalyst supporting base 1a may be configured by disposing the catalyst supporting members 15 and 16 only on one surface of the reinforcing body 14.

Catalyst-supporting substrate 1 in the embodiment shown in FIGS. 4 and 5
Specific examples of a are as follows.

^Two aluminum fiber mats (250 g / m ² ) having a fiber diameter of 0.15 mm were used for the catalyst-supporting members 15 and 16, and an aluminum lath wire net having a plate thickness of 0.35 mm and a slit cut width of 5 mm was used for the reinforcing body 14. The above member is combined in a sandwich structure with the reinforcing body 14 as a core, compressed at a pressing pressure of 500 ton / m ² , and sintered at 600 ° C. for 15 minutes to obtain a porosity of 95.
% Catalyst-supporting substrate 1a, which is dipped in a 20% aqueous solution of gamma-alumina sol, dried, calcined at 550 ° C. for 15 minutes, dipped in an ethyl alcohol solution of platinum chloride (1 wt%) and pulled up The surface self-cleaning body 1 is formed by coating so that the amount becomes 1 g / min, and then baking at 550 ° C. for 15 minutes.

Since this planar self-cleaning body 1 can be easily processed into a required shape by a press or the like, it can be processed according to the shape of the inner wall surface of the heating chamber 2 and adhered to the inner wall surface as shown in FIG. it can.

In this mounting, the gap between the planar self-cleaning body 1 and the inner wall of the heating chamber 2 is not particularly limited, and an appropriate small gap may be provided, or they may be mounted in contact with each other. .

In addition, in FIG. 1, 5 is a grill on which the food 8 is placed,
6 is a door that opens and closes the opening of the heating chamber 2, 7 is a saucer that is detachably attached to the bottom of the heating chamber 2, and 8 is a power cord.

The operation of the heating cooker of the present invention configured as above will be described below.

When energized by the power cord, the heating element 3 generates heat and heats the air in the heating chamber 2 for cooking to a temperature suitable for cooking.
By the way, since the sheet self-cleaning body 1 is mounted on the inner wall surface of the heating chamber 2 with a small gap or in contact with the heating chamber 2, the sheet self-cleaning body 1 passes through the voids from the front surface to the back surface. Since it is difficult for the heated air to rise in the small gap between the planar self-cleaning body 1 and the inner wall surface, the heated air recirculates from the back surface of the planar self-cleaning body 1 to the inside to promote the temperature rise of the planar self-cleaning body 1. Done. Also,
The heated air that has entered the planar self-cleaning body 1 also convects inside the planar self-cleaning body 1 to raise the temperature of the planar self-cleaning body 1 from the inside.

In this way, the heated air passes through the planar self-cleaning body 1 and recirculates or convects the planar self-cleaning body 1.
Can be heated rapidly and uniformly to raise the temperature.

When the heating chamber 2 reaches an appropriate temperature, the cooked food 8 is placed on the grill 5 and cooked by heating. Generally, the cooked food that is apt to be contaminated, such as fish and meat, has oil and fat inside the heating chamber as the cooking progresses. Although it scatters and adheres to the wall surface, since the planar self-cleaning body 1 is attached to the inner wall surface of the heating chamber 2, the oil and fat that scatter and adhere are sequentially oxidized and decomposed by the planar self-cleaning body 1. During this oxidative decomposition action, due to the air permeability of the planar self-purifying body 1, sufficient oxygen is supplied to the oil and fat adhesion portion from the surroundings and the back surface thereof, and the oxidative decomposition action is also performed on the localized remarkable oil and fat adhesion. Does not leave stains on the surface self-cleaning body 1, and it is possible to always maintain a clean state even if cooking is repeated.

Further, in cooking such as toasting in which the surface is burnt in a short time, if the metallic sheet-like self-purifying body 1 shown in the second embodiment is used, the sheet-like self-purifying body 1 is metallic. It has infrared reflectivity, and infrared rays radiated from the heating element 3 are reflected to burn the surface of the cooked product 8. As described above, this reflecting action can be always stably obtained because the planar self-cleaning body 1 is constantly cleaned.

Next, the purification performance and the durability performance of the planar self-cleaning body mounted according to the configuration of the present invention and the conventional configuration will be described with reference to FIG.

This comparison was carried out by using a cut test piece having a size of 9 × 5 cm. With the construction of the present invention, a metal plate was attached to the back surface side of the planar self-cleaning body 1 to be mounted and tested.

In the figure, the vertical axis represents the purification rate after 100 mg of lard was uniformly applied to the surface of the test piece each time and the applied surface was heated at 200 ° C. for 30 minutes, and the horizontal axis represents the number of repetitions. Curve A shows the purification rate of the sheet self-cleaning body 1 according to the constitution of the present invention, and curve B shows a conventional porcelain enamel having manganese dioxide as a main catalyst component formed on one side of an aluminum-plated steel sheet having a thickness of 0.6 mm. The purification rate of the enamel coating layer is shown.

As is apparent from the figure, the planar self-cleaning body 1 according to the present invention has a high purification rate, and even if the number of times is repeated, the activity is maintained and the purification rate hardly decreases. Then, the activity disappeared after two times. This is because the planar self-cleaning body 1 has air permeability in all directions inside, and heated air can freely flow in and out,
The heated air that has entered the planar self-cleaning body 1 is blocked by the metal plate and does not pass to the back surface, and the entire surface is uniformly heated by the internal convection, and the periphery and the back surface of the lard coating surface. Oxygen is supplied from the surface of the sheet self-cleaning body 1 according to the present invention, which shows excellent purification performance and durability. In the comparison shown in FIG. 6, a metal plate is attached to the back surface of the sheet self-cleaning body 1 in contact therewith. However, a natural gap at the time of attachment or a small gap may be provided intentionally. No significant difference was observed in the above performance.

FIG. 7 is a diagram comparing the temperature rising characteristics of the planar self-cleaning body according to the constitution of the present invention and the conventional one, which was carried out using a cutting test piece of 30 × 30 cm, and the constitution of the present invention. A metal plate was attached to the surface self-cleaning body 1 in contact with the back surface of the surface self-cleaning body 1.

Further, the comparison was performed by setting the surface of the purifying body so as to face the heated air of 200 ° C. and measuring the time required for the test piece to reach 200 ° C.

In the figure, a curve C shows the temperature rise characteristics of the planar self-cleaning body 1 according to the present invention, and a curve D shows the temperature rise characteristics of the conventional one.

As is apparent from the figure, similar to the above description of the purification characteristics and durability, the planar self-cleaning body 1 according to the configuration of the present invention is operated by the action of the heated air passing through, refluxing, and convectioning the planar self-cleaning body 1. Is significantly superior to conventional ones in temperature rising characteristics.

Next, a comparison of the characteristics of reflecting infrared rays radiated from the heating element to brown the cooked food is shown in FIG. 4 and FIG. Using a cooking device, two slices of bread with six slices were baked. The results are shown in the table below.

As is clear from the table, the structure of the present invention is more easily browned than the conventional structure, and is excellent in infrared reflection characteristics.

This is because the planar self-cleaning body 1 is made of metal and that the planar self-cleaning body 1 is constantly purified.

EFFECTS OF THE INVENTION As described above, according to the present invention, a housing, a heating chamber provided in the housing and having a heating element disposed therein, and a planar self-cleaning device in which a catalyst component is supported on a catalyst-supporting substrate having air permeability. Since the planar self-cleaning body is attached to the inner wall surface of the heating chamber, the heated air in the heating chamber can freely flow in and out of the planar self-cleaning body, and the heated air entering the inside is Convection inside,
Further, since the heated air that has escaped from the inside to the inner wall surface side of the heating chamber is returned to the inside of the planar self-cleaning body again, the planar self-cleaning body is heated quickly and uniformly. This eliminates unevenness in the catalytic purifying effect depending on the part and improves the purifying ability.Also, even if remarkable stains from cooked food are attached, sufficient oxygen is supplied from the back side and surroundings of the stains to perform the catalytic purifying action. Since it does not leave stains on the surface of the planar self-cleaning body and can obtain excellent durability, it becomes a cooking base with cleaning characteristics and durability superior to those of conventional structures. It is a thing.

Further, if the sheet-like self-cleaning body is made of metal, the infrared ray radiated from the heating element can be reflected and the cooker is suitable for cooking with brown eyes.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a heating cooker of the present invention,
2 and 4 are exploded perspective views of the catalyst-supporting substrate, and FIG.
FIG. 5 is a cross-sectional view of the catalyst-supporting substrate, FIG. 6 is a comparison diagram of purification characteristics, and FIG. 7 is a comparison diagram of temperature rising characteristics. 1 ... Planar self-cleaning body, 1a ... Catalyst supporting substrate, 2 ...
Heating chamber, 3 ... Heating element, 4 ... Housing.

Claims (1)

[Claims] 1. A planar self-cleaning body mounted on an inner wall surface of the heating chamber, wherein a heating chamber is provided inside the casing and has a heating element provided therein. The purification body is composed of a fibrous aggregate of inorganic porous metal, ceramic, glass or a composite thereof, a foam, a porous laminate, and a papermaking machine, and carries a catalyst having continuous pores with air permeability in all directions inside. A heating cooker in which a catalyst is supported on a member and which is composed of a catalyst-supporting substrate laminated with a breathable reinforcing body.