JPH0313731A - Heating device - Google Patents

Abstract

PURPOSE:To enable a scorching to be attained in a short time by a method wherein a surface of an upper plate of an oven housing facing against a heater is coated with ceramic material for radiating infrared rays. CONSTITUTION:A surface of an upper plate 2a of an oven housing 2 facing against a heater 9 is coated with a ceramic material 11 thereon for radiation of an infrared ray by being heated. Accordingly, the infrared ray from the heater becomes a near infrared ray (a wavelength of 0l8 to 4 mum) passed through a quartz tube and radiated and a far infrared ray (a wavelength of 0.4 to 1000 mum) radiated from the ceramic material coated at an inner surface of the upper plate of the oven housing due to a heat from the quartz tube, resulting in that a radiation of the infrared ray becomes far- and near infra-red rays. With such an arrangement, it is possible to perform a fast scorching of various foods into a deep portion thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating device for cooking food.

2. Description of the Related Art Conventionally, a heater function has been added to a high-frequency heating device, and after the food is cooked using high-frequency waves, the surface of the food is quickly burnt using a heater, for example, as shown in FIG. 1 and FIG. things are known.

Below, referring to the drawings, reference numeral 1 denotes an exterior case with an oven compartment 2 inside, and an opening in the front of the oven compartment 2 is used for loading and unloading food 3 placed inside the oven compartment 2. An opening/closing door is provided.

Inside the oven chamber 2, a tray 4 for receiving the food 3 is held at the center or lower end in the vertical direction. Reference numeral 5 denotes a magnetron that oscillates high-frequency waves, which is provided inside the outer case 1 and outside the oven chamber 2, and is used to cook the food 3 using high-frequency waves guided into the oven chamber 2 via a waveguide 6 and a cover 7. It is composed of 8
is a high voltage power supply device for applying high voltage to the magnetron 6 and generating high frequency waves. Reference numeral 9 denotes a heater using a quartz tube 10 installed at the upper end of the oven chamber 2. When the high-frequency cooked food 3 needs to be browned, the food 3 is placed in the open chamber 2 together with the saucer 4 as shown in the figure. The food 3 is placed at the center in the vertical direction, and then the food 3 is browned by the infrared rays of the heater 9. In order to improve the thermal efficiency of the infrared rays, the upper 4N
The upper plate 2a is made of stainless steel with a mirror finish.
The oven cabinets 2 other than a are constructed of inexpensive iron plates or the like whose surfaces are painted.

Problems to be Solved by the Invention However, in the conventional configuration, when the heater 9 burns after high-frequency cooking, when the infrared rays from the heater 9 made of nichrome wire or the like pass through the quartz tube 10, as shown in FIG. As shown in the figure, far infrared rays with a wavelength of 5 μm or more are not transmitted, so it is difficult for the burnt material of the food to penetrate into the interior, and the natural frequency of food with low water content or the molecules of the food is 5 μm.
When resonance occurs at a frequency higher than that, the burning may be insufficient or may take too much time.

The present invention solves these problems by providing a heating device that can quickly brown various foods to the inside and cook them deliciously and quickly.

Means for Solving the Problems In order to solve the above problems, the heating device of the present invention uses a ceramic material 11 that emits far infrared rays by applying heat to the surface of the upper plate 2a of the open storage 2 facing the heater 9. It has a painted structure.

Effect With the above configuration, the near infrared rays (wavelength 0.8 to 4 μm) emitted from the heater pass through the quartz tube, and the inner surface of the top plate of the open storage is coated with the heat from the heater through the quartz tube. Due to the far infrared rays (wavelength 4 to 1000 ttm) emitted from the ceramic material, the irradiation of infrared rays to foods becomes far and near infrared rays, and various foods can be quickly browned to the inside.

EXAMPLE Hereinafter, an example of the present invention will be explained using the drawings (Figs. 1 to 6).
The explanation will be based on Figure). In the drawings, the same reference numerals as in the conventional example indicate the same members, and detailed explanation thereof will be omitted.

First, to explain the embodiment shown in FIG. 1, infrared rays from a heater 9 made of nichrome wire or the like installed at the upper end of the oven compartment 2 pass through a quartz tube 10 on the outer periphery of the heater 9 to heat the food 3. It is structured to give a dark impression. As shown in FIG. 4, this quartz tube 10 has a property of transmitting near infrared rays having a wavelength of 0.8 μm to 4 μm, but absorbing heat and not transmitting other infrared rays, although this varies depending on the thickness.

Furthermore, when ordinary glass material is used, similar values are shown as shown in Fig. 4.

Next, approximately 50% of the infrared rays emitted from the heater 9 via the quartz tube 10 are used to heat the upper plate 2a of the open storage 2. As shown in the figure, the wavelength is 4 μm to 10
It is configured to radiate far-infrared rays of μm to heat and brown the food 3. The main raw materials of this ceramic material 11 are silica (Sing), as shown in FIG.
These are alumina (AlI3, ), titania (TiO, etc.).With the above two configurations, the food 3 is uniformly irradiated with far and near infrared rays of 0.8 μm to 10 μm as shown in FIG.

By the way, in the embodiment shown in FIG.
The upper plate 2a is formed in a flat state, but as shown in FIG.
It is also possible to form ceramic material 1.
The far infrared rays from 1 are more efficiently and concentratedly irradiated onto the food 3, making it possible to brown the food quickly by heating it quickly.

Effects of the Invention As is clear from the description of the embodiments above, according to the heating device of the present invention, the heater The infrared rays from the quartz tube and the indirect irradiation of the far infrared rays from the ceramic material have traditionally made it difficult for food burnt to penetrate into the interior, making it difficult for some foods to burn. Problems such as the amount of time it took to burn the food were resolved, uniform browning penetrated to the inside of various foods, and it became possible to brown the food by accelerating the process, resulting in a highly satisfying effect for the users. .

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a heating device in a first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a heating device in a second embodiment of the present invention, and FIG. 3 is a cross-sectional view of a heater section in the embodiment. figure,
FIG. 4 is a diagram showing the spectral transmittance of quartz and glass, FIG. 5 is a diagram showing the spectral emissivity of various ceramics, and FIG. 6 is a diagram showing the spectral emissivity of food. 2...Open storage, 2a...Top plate, 9
... Heater, 10... Quartz tube, 11.
...Ceramics material.

Claims (1)

[Claims] A heating device that includes a heater that heats food placed inside an oven, and uses ceramic raw materials that have the property of emitting far-infrared rays to a wall of the oven that is close to and faces the heater.