JPS63146377A - Cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooking appliance such as a toaster oven or an electric stove, which is equipped with a heater that utilizes far-infrared radiation.

Conventional technology Traditionally, cooking appliances such as toaster ovens and electric open cookers have been used to bake mochi, kutsky, pizza, gratin, etc. in addition to bread, and recently they have often been used in the market to replace conventional bread toasters. It's all over the place.

Such toaster ovens and electric ovens generally have an inner casing that forms a cooking chamber within the outer casing, an upper heater and a lower heater placed above and below the cooking chamber, and a front surface of the cooking chamber. It has a structure that includes a cover door and a net for placing food that is linked to the opening and closing operations of the door.

(Publication number 68-39290, Publication number 68-540
Publication No. 38) In addition, as the upper heater and the lower heater, a coiled heating wire arranged in a tube made of quartz or crystallized glass (trade name: Miraculo/) has traditionally been mainly used. .

On the other hand, recently, various cooking appliances that utilize far-infrared radiation have appeared on the market, and even in cooking appliances such as toaster ovens and electric open stoves, far-infrared radiation layers are formed on the upper or lower heaters. Many things have been proposed.

Problems to be Solved by the Invention The currently proposed method for forming a far-infrared emitting layer is to blast the surface of a quartz tube or crystallized glass tube, and then apply a far-infrared emitting material such as zirconium oxide or mullite. The surface of a quartz tube or crystallized glass tube can be coated by thermal spraying, or by spraying or dipping a far-infrared emitting material added to an inorganic adhesive using water glass or aluminum phosphate as a binder. This is done by either coating or coating. However, among the methods proposed in the past, coating by thermal spraying has excellent adhesion and heat resistance to quartz tubes and crystallized glass tubes, but it is extremely expensive and poses problems in practical use. Ta.

On the other hand, spraying and dipping methods using inorganic adhesives are relatively inexpensive, but have poor thermal shock resistance and heat resistance, and the far-infrared emitting layer gradually peels off during use.
There was a problem.

As described above, the methods proposed so far have advantages and disadvantages, and have been difficult to put into practical use.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems and provide a cooker equipped with a heater having a far-infrared radiation layer that is inexpensive, has excellent adhesion, and exhibits excellent cooking effects. 0 Means for Solving the Problems In order to achieve the above object, the cooking appliance of the present invention includes an inner casing forming a cooking chamber within the outer casing, and a cooking chamber disposed within the cooking chamber. It includes a heater, a lower heater, a door that covers the front opening of the cooking chamber, and a mesh for placing food that is linked to the opening/closing operation of the door, and the upper heater and the lower heater are made of quartz tube or crystallized glass. The surface of the tube is coated with silicon oxide as the main component, zirconium oxide, albanium oxide, iron oxide, manganese oxide, and cobalt oxide using the sol-gel method.

A far-infrared radiation layer is formed using at least one of nickel oxide as a far-infrared radiation material, and a heating wire is installed inside the quartz tube or crystallized glass tube.

Function The sol-gel method described in the present invention is a coating forming method that is currently in the spotlight, and can form a strong coating on the surface of a substrate by heat treatment at a relatively low temperature.

In the present invention, a sol using hydrolysis of ethyl silicate
It uses a gel method and contains a far-infrared emitting material.

Therefore, the coating formed on the surface of a quartz tube or crystallized glass tube using these materials contains silicon oxide as a main component and a far-infrared radiating material. A far-infrared emitting layer can be formed.

In addition, the far-infrared emitting layer obtained in this way has silicon oxide as its main component, and its thermal expansion coefficient closely matches that of the base material, quartz tube or crystallized glass tube. , exhibits excellent heat resistance and thermal shock resistance.

Furthermore, these films are formed by dipping a quartz tube or crystallized glass tube in a pre-prepared solution or by spraying the solution, and then applying the solution for 20 minutes.
Since a simple method of heat treatment at a low temperature of around 0'C is sufficient, it is much cheaper than the conventional thermal spraying method.

For these reasons, the upper and lower heaters in which far-infrared radiation layers are formed using the sol-gel method are inexpensive and have excellent adhesion, and cooking appliances using these heaters are highly practical. Become something.

Zirconium oxide and aluminum oxide are conventionally used far-infrared radiating materials.

At least one of iron oxide, manganese oxide, cobalt oxide, and nickel oxide may be used.

Furthermore, by cooking with a cooking device that uses a heater on which such a far-infrared ray emitting layer is formed, the roasting effect can be enhanced and power consumption can be reduced, and significant effects can be expected.

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 3.

In the figure, reference numeral 1 denotes an outer casing of a toaster oven, and an inner casing 2 housed in the outer casing 1 forms a cooking chamber 3 with an open front. Reference numeral 4 denotes a door that covers the front surface of the cooking chamber 3, the lower end of which is pivotally connected to the outer casing 1 so that it can be opened and closed freely, and a finder glass is incorporated in the center of the door 4.

A net 6 for placing cooking items provided in the cooking chamber 3 is slidably supported so that it can be freely moved in and out toward the front side, and the net 5 is connected to the door 4 via an arm 6. , is configured to move in and out in conjunction with the opening and closing of this door 4.

Reference numeral 7 denotes a bottom plate of the cooking chamber 3, which is provided at the bottom of the outer casing 1 so as to be openable and closable. Inside the cooking chamber 3, an upper heater 8 and a lower heater 9 are arranged in the longitudinal direction of the outer casing 1. These upper heater 8 and lower heater 9 are crystallized glass tubes 8N and 9.
Far-infrared emitting layers 8b and 9b containing silicon oxide as a main component and zirconium oxide as a far-infrared emitting material are formed on the outer surface of the crystallized glass tubes 8.1L and 91L by a sol-gel method. Heating wires 10.11 are arranged in the center.

When the bread 12 is roasted in the toaster oven having the above configuration, the cooking time is 1 to 2 seconds compared to the toaster oven using conventional crystallized glass tubes 81L and 91L as the upper heater 8 and lower heater 9. It was relatively short, and the effect of far infrared rays was obtained.

In addition, even when cooking baked goods other than bread, the oven achieved a degree of toasting that could not be achieved with conventional toaster ovens, shortened the cooking time, and had excellent effects on taste.

On the other hand, in order to evaluate the coating of the far-infrared emitting layer, we set the surface temperature of the heater to approximately 800°C and conducted an intermittent energization test in which one cycle was 3 minutes of energization and 1 minute of rest. Even after a period of time, no peeling phenomenon of the far-infrared emitting layer was observed, and excellent adhesion strength was exhibited.

In this way, by using a far-infrared radiation layer formed on the surface of a conventional quartz tube or crystallized glass tube by the sol-gel method as the upper and lower heaters, it is possible to achieve low cost and high adhesion. This makes it possible to provide a cooker equipped with a heater that is excellent in cooking efficiency and also exhibits excellent cooking effects.

In the embodiments of the present invention, a heater using a crystallized glass tube is used, but the heater is not limited to this, and a quartz tube may also be used.

Furthermore, although zirconium oxide was used as the far-infrared radiating material, other materials such as aluminum oxide, iron oxide, manganese oxide, and cobalt oxide were also used.

At least one of nickel oxide may be used.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention,
The upper heater and the lower heater are made of silicon oxide and zirconium oxide on the surface of a quartz tube or crystallized glass tube using the sol-gel method.

Since the far-infrared radiation layer is formed using at least one of aluminum oxide, iron oxide, manganese oxide, cobalt oxide, and nickel oxide as a far-infrared radiation material, the far-infrared radiation layer can be formed by dipping or spraying. It is formed by applying heat treatment at a low temperature of about 200'C after coating, and the manufacturing cost is lower than that of the conventional thermal spraying method.

In addition, the thermal expansion coefficient of silicon oxide, which is the main component of the far-infrared emitting layer, matches that of the quartz tube or crystallized glass tube that is the base material, so it has excellent heat resistance and thermal shock resistance. It has excellent characteristics and can improve product reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a toaster oven showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the toaster oven, and FIG.
The figure is a sectional view of the main parts of the toaster oven. 1...outer casing, 2...inner casing, 3...
...Cooking room, 4...Door, 5...Grate, 8...Upper heater, 9...Lower heater, 8
! L, 9N...Crystalline glass tube, 8b. 9b...Far-infrared radiation layer, 10.11...
・・Heating wire 1, name of agent: Patent attorney Toshio Nakao and 1 other person l-Outer body 2-Inner body 3-114 Law I-m 8a, 9a-Crystalline glass 8b, 9b - Outside the connection Keikyo Hiroshi 11 ρ, 77-Heating wire Figure 3 d/y

Claims (1)

[Claims] An inner casing forming a cooking chamber within the outer casing, an upper heater and a lower heater disposed within the cooking chamber, a door covering a front opening of the cooking chamber, and a food to be cooked that is linked to the opening/closing operation of the door. and a mounting net, the upper heater and the lower heater,
On the surface of a quartz tube or crystallized glass tube, silicon oxide is the main component and at least one of zirconium oxide, aluminum oxide, iron oxide, manganese oxide, cobalt oxide, and nickel oxide is applied as a far-infrared radiating material by a sol-gel method. A cooking appliance having a structure in which a far-infrared radiation layer is formed and a heating wire is installed inside the quartz tube or the crystallized glass tube.