JPH03254094A - High frequency heating device - Google Patents

Abstract

PURPOSE:To accomplish a cooking heater device with a compact capacity heating chamber capable of exerting uniform heating, by furnishing wall surface of non-metal material at a cavity in which microwaves are confined, wherein the wall surfaces are located with a certain gap to the cavity wall, and thereby forming the heating chamber. CONSTITUTION:Microwaves generated by a magnetron 1 are passed through a wave-guide tube 2 and confined in a cavity 3. A heating chamber 9 is bounded among others by a bottom plate 8 of non-metal material and partition plate 6 of a low dielectric loss material located with a certain gap to the wall of this cavity 3, and the top and bottom of this chamber 9 are high frequency heated over wide extents. This heating chamber can be constructed compactly by uniform electric field due to avoidance of interposing of an intense electric field space to be generated by a throttle 7 and microwaves given through the gap. Thus a microwave oven concerned having a high frequency heating device is equipped with portability as well as capability of efficient and uniform heating.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-frequency heating device for heating objects made of solids or fluids using microwaves.
To be more specific, 1.
-Relates to a high-frequency heating device with a compact heating chamber capable of cooking food for two people.

A typical example of a conventional high frequency heating device is a microwave oven. Conventional microwave ovens have a heating chamber volume that can accommodate one household (3 to 5 people). This kind of microwave oven is 3 to 5
The amount of microwave power supplied to the heating chamber was adjusted so that cooking and heating for humans could be performed.

The amount of microwaves varies depending on the size, shape, and material of the object to be heated, and the amount of microwaves is generally measured using water. The microwave output specified on microwave oven products is water load 2000 specified by JIS.
This is the output value at cc.

However, microwave ovens take advantage of their greatest advantage, speedy cooking, and are used, for example, to increase the cooking power of microwave-specific foods and to planer sake for evening drinks. These cooking processes require approximately 500 cc of water at most.

When the amount of load on a microwave oven decreases, the actual microwave output decreases. For example, the microwave output for 200 cc of water, which corresponds to the amount of milk, alcohol, etc., is 20 cc of water.
The output is around 70% compared to 00cc.

On the other hand, looking back at the social environment, eating habits have changed with the advent of microwaveable foods and frozen foods and the expansion of the restaurant industry.Furthermore, outdoor leisure activities have become popular as people have more free time. . In such a social environment, a high-frequency heating device that is lightweight and compact, preferably portable, and can be used outdoors is desired.

In order to make this type of device compact, it is necessary to reduce the capacity of the heating chamber that houses the object to be heated.

A conventional heating chamber has a width and a depth that are approximately two to three times the wavelength of the microwave that is supplied thereto. Therefore, several to ten or more strong electric field spaces are formed in this heating chamber. If the distribution of this strong electric field space is left as it is, the object to be heated will be heated non-uniformly, so in practical configurations, means for disturbing the strong electric field distribution or means for rotating the object to be heated are used to promote uniform heating.

Problems to be Solved by the Invention However, if this heating chamber were to be heated to a microwave wavelength of 2
If you try to configure the width and depth dimensions to be less than double the dimensions, the number of strong electric field spaces generated in the heating chamber will be fewer than a few, and uniform heating of the object to be heated will be promoted unless the strong electric field distribution is considerably disturbed. There are difficult issues. This brute force method is like placing a standard-sized electric fan with metal blades in a heating chamber with a floor area equivalent to 1 tatami mat, and the actual usable space of the heating chamber is reduced. It has very narrow challenges.

The present invention has been made to solve such conventional problems, and an object of the present invention is to provide a convenient high-frequency heating device that has a compact heating chamber and is portable.

Means for Solving the Problems In order to solve the above problems, the high frequency heating device of the present invention is provided with a heating device that is located inside a cavity that substantially confines the supplied microwaves and forms a substantial space in which the object to be heated is accommodated. In the chamber, a wall surface on which the object to be heated made of a non-metallic material is disposed with a predetermined gap from the wall surface of the cavity and faces the mounting wall surface. The wall is made of non-metallic material.

According to the present invention, with the above-described configuration, by moving the object to be heated substantially away from the wall surface of the cavity, the difference in the strength of the electric field in the space where the object to be heated is present is alleviated, and uniform heating is promoted.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIGS. 1 and 2, ■ is a magnetron that generates microwaves; 2 is a waveguide that transmits microwaves generated from the magnetron 1 to a cavity 3 that substantially confines them;
Reference numeral 4 denotes a microwave feeding opening provided on the wall of the cavity, and 5 refers to a radio wave stirring blade that rotates below the feeding opening and substantially stirs the microwaves fed from the opening and radiates them diffusely into the cavity. , 6 is a partition plate made of a low dielectric loss material that covers the space in which the radio stirring blade is provided, and 7 is a partition plate provided on the wall forming the cavity 3 to a predetermined depth (10 to 20 mm) in the outward direction of the cavity.
The convex convex constriction part 8 having a diameter of 1 mm) is made of a non-metallic material such as glass, ceramic, or silicon laminate, which covers the convex convex constriction part and forms a bottom plane on which the object to be heated is placed. This is the bottom surface. In the above configuration,
The space of the heating chamber 9 that can substantially accommodate the object to be heated has upper and lower walls made of a material to be metallized.

Reference numeral 10 designates a power supply unit that drives and controls the magnetron, 11 a door that opens and closes the front of the heating chamber 9 and allows objects to be heated to be taken in and out of the heating chamber, 12 an operation panel, 13 a main body, and 14 a main body support.

In such a configuration, a region is formed in which the bottom surface on which the object to be heated is placed is disposed with a predetermined gap from the cavity wall surface that substantially confines the microwaves. Due to this gap, the microwaves pass through the object to be heated, are reflected by hitting the cavity wall, and are incident on the object again, so that uniform heating can be promoted. Furthermore, for a cavity of small volume, several strong electric field spaces are generated within the cavity, and these strong electric field spaces are scattered on the cavity wall surface or in the spaces inside the cavity. A method for promoting uniform heating is to not allow objects to be heated to exist in this strong electric field space. This is achieved by making the depth of the convex constriction part 10 to 20 mm. In addition, the distribution of the strong electric field inside the cavity is somewhat disturbed by the radio wave stirring blades, so even if the object to be heated is interposed in the strong electric field space, the intervening part is not always dominated by the strong electric field space and uniform heating is achieved. promoted. Note that it is preferable that the radio wave stirring means be as thin as possible and have a large diameter.

FIG. 3 shows another embodiment of the present invention, in which the bottom plate 8 of the heating chamber has a plurality of convex squeeze portions 15 provided in the cavity.
The gaps between the cavity wall and the bottom plate are distributed and arranged by ~19. When the object to be heated, for example, coffee 20, is stored in the heating chamber, the convex squeeze portions of the cavity are dispersed under the bottom surface of the coffee pot, as shown in the figure. This allows the coffee to be heated evenly from top to bottom.

An example of the structural dimensions of the present invention will be shown below. The heating chamber has a width of 185 mm, a depth of 155 mm, and a height of 11 mm.
0 mm, the aperture part has a radius of 60 mm and a depth of 10 mm, the radio stirring means has a height of 11 mm and a radius of 60 mm, and the upper and lower non-metallic materials are silicon laminates with a thickness of 1.6 mm. When this heating chamber was used to microwave a coffee cup for a vending machine containing 150 cc of coffee, the temperature at the top was 66°C and the salinity at the bottom was 67°C.

Effects of the Invention As described above, the high frequency heating device of the present invention provides the following effects.

(1) By arranging the bottom plate of the actual heating chamber in which the object to be heated is housed with a gap from the wall surface of the cavity that confines microwaves, and by constructing it from a non-metallic material,
Microwaves can be incident on the object to be heated from above and below, and the incident position can be spread over a wider range, so that uniform heating can be promoted.

(2) By arranging the bottom plate of the actual heating chamber on which the object to be heated is placed with a gap from the cavity wall surface, the object to be heated is placed in the strong electric field space generated on the cavity wall surface. Uniform heating of the object to be heated can be promoted by avoiding intervention.

(3) By constructing the upper and lower walls of the heating chamber, in which the object to be heated is substantially housed in the microwave-confined cavity, from non-metallic materials, a compact cavity that does not impair uniform heating can be constructed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a high-frequency heating device showing one embodiment of the present invention, FIG. 2 is a cross-sectional view of the main parts of the same, and FIG. FIG. 1... Magnetron, 3... Cavity, 6...
...Partition plate made of low dielectric loss material (wall surface L7, 15 to 1 made of non-metallic material... Squeezing part, 8... made of non-metallic material) Naru bottom plate, 9
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Claims (2)

[Claims] (1) A heating chamber is provided inside the cavity that substantially confines the microwave to be supplied and forms a substantial space in which the object to be heated is housed, and at least approximately the center thereof is in a predetermined position with respect to the wall surface of the cavity. A high-frequency heating device, wherein a wall surface on which the object to be heated is placed, which is made of a non-metallic material and is arranged with a gap of , and a wall surface facing the placing wall surface are made of a non-metallic material. (2) A heating chamber is provided inside the cavity that substantially confines the supplied microwave and forms a substantial space in which the object to be heated is housed, and at least approximately the center thereof is in a predetermined position with respect to the wall surface of the cavity. A high frequency heating device, wherein a wall surface on which the object to be heated made of a non-metallic material is placed with a gap therebetween, and a wall surface facing the placement wall surface are made of a low dielectric loss material.