JP2000208248A - High-frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-frequency heating device hard to generate temperature differences between a center part and an outer peripheral region thereof and applying uniform heating when food subject to be heated is heated. SOLUTION: In this high-frequency heating device, a heating chamber 11 is provided with a magnetron 10 for introducing a high frequency wave and an object-to-be-heated placing table 18 is detachably disposed in the heating chamber 11. The surface of the object-to-be-heated placing table 18 is formed to have protrusions 19 in a protruding shape. The backside thereof is provided with a radio wave concentrating body 21 consisting of a low dielectric constant material. By this construction, a radio wave is concentrated on the radio wave concentrating body 21 of a dielectric so that the center part of a food 20 is heated well and can be heated uniformly with heating form periphery. The food 20 is raised by the protrusions 19 in a projecting shape, thus juice coming out of the food 20 is not attached and the food 20 can be heated in a good appearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-frequency heating device such as a microwave oven.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show the technology of a conventional high-frequency heating device. Hereinafter, a conventional example will be described with reference to the drawings.

As shown in FIG. 6, a heating chamber 1 is provided with a waveguide 2. Radio waves from a magnetron 3 provided in the waveguide 2 pass through the waveguide 2 and are radiated from the opening 4 into the heating chamber 1. The electric wave stirring blade 5 above the heating chamber 1 causes the heating chamber 1
To make the radio wave inside. Reference numeral 6 denotes a motor for driving the radio wave stirring blade 5. A shelf 7 is provided on a side surface of the heating chamber 1 and holds a mounting table 8 made of a low dielectric constant material. A food 9 to be heated is placed on the mounting table 8, and the food 9 is high-frequency heated by radio waves from the magnetron 3.

FIG. 7 shows a state in which the food 9 on the mounting table 8 is heated by high frequency. The solid arrow schematically shows the state of the radio wave applied to the food 9. The radio waves penetrate into the food from the outer peripheral surface such as the top and bottom of the food 9. The radio wave first heats the surface of the food at high frequency, so that it attenuates to a certain extent from the surface to the inside of the food.

As shown in FIG. 7, when the amount of food is large and the thickness is large, the intensity of radio waves directed toward the inside of the food becomes weak, and the inside is hardly heated as compared with the surface of the food. The oblique lines indicate the state of heating the food, and indicate the state where the outer peripheral portion of the food is heated to a higher temperature than the inside.

[0006]

However, in such a conventional configuration, in the case of a heated object having a heavy food weight and a large lump-like shape, the above-mentioned reason is not satisfied. Inevitably, the outer peripheral portion of the food is easily heated, and the central portion and the inside of the food are hardly heated, so that a raw state remains, and it is difficult to perform uniform heating. In particular, in the case of frozen food that stores food at a negative temperature, heating is started from the surface of the food, and as thawing progresses, radio waves are more easily absorbed by the dissolved water on the surface, so heating unevenness is more remarkable. And uniform thawing heating was difficult.

Further, in order to uniformly heat such a large food, the intensity of the radio wave in the heating chamber is changed, and the electric field strength of a portion corresponding to the center of the food, such as the center of the heating chamber, is intentionally increased. In some cases, a uniform heating state can be obtained by arranging such a state of radio wave irradiation.

However, when a plurality of foods are heated, the central part of the foods and the position of strong radio waves in the heating chamber do not always coincide with each other. However, uniform heating could not be performed.

As described above, according to the conventional high-frequency heating apparatus, when the size and shape of the food change, the heating state changes, and it is not possible to heat all the food uniformly. In particular, in the case of foods such as large lumps, there is a disadvantage that the central portion is hardly heated. Since this is a problem caused by the difference in the state of absorption of radio waves of the food, it is extremely difficult to solve the problem only by the configuration of the radio wave stirring or the configuration of the turntable that rotates the food itself.

[0010] The present invention solves the above-mentioned problems, and the radio wave concentrator concentrates radio waves at the center of the food to make the heat generation state of the outer periphery and the inside of the food uniform, thereby uniformly heating the whole food. It is an object of the present invention to provide a high-frequency heating device having good heating performance.

[0011]

According to the present invention, in order to solve the above-mentioned problems, a heating object mounting table made of a low dielectric constant material is detachably provided in a heating chamber, and the surface of the heating object mounting table is convex. It has a shape having projections, and a radio wave concentrator is provided on the back surface. A frame having a dimension higher than the thickness of the radio wave concentrator is provided on the outer peripheral portion of the back surface of the heated object mounting table.

Further, the surface of the heated object mounting table has a shape having a plurality of linear projections, and the convex projections have a direction in which the heated object mounting table enters and exits the heating chamber. It is a right angle direction.

According to the above invention, when the food is placed on the heated object mounting table, the food is supported by the convex projections of the heated object mounting table, and the food is transferred to the concave portions such as juice and fat that come out of the food during heating. escape,
The food can be prevented from getting wet. In addition, the radio wave concentrator is located at the bottom of the food, and the dielectric has the property of attracting radio waves, so the electric field strength near the dielectric becomes higher than other parts, and the food near the radio wave concentrator Will be heated from other parts of the food. As a result, the central portion of the food is heated more than the peripheral portion, so that the peripheral portion and the central portion of the food result in the same temperature rise, and the entire food is uniformly heated.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a heating chamber, a high-frequency generating means coupled to the heating chamber, and a heating object mounting table made of a low dielectric material in the heating chamber, which is detachably provided.
The surface of the heated object mounting table has a convex shape, and a single or a plurality of radio wave concentrators are provided on the back surface of the heated object mounting table.

[0015] When the food is placed on the heated object mounting table, the food is supported by the convex projections of the heated object mounting table, and juices and fats, etc., which have come out of the food during heating escape to the concave portions, and the food is removed. It can be prevented from getting wet. A radio wave concentrator is located at the bottom of the food. Since the dielectric material constituting the radio wave concentrator has the property of attracting radio waves, the electric field strength near the dielectric material becomes higher than other parts, and the food near the radio wave concentrator is heated from the food in other parts. Will be. That is, since the central portion of the food is heated more than the peripheral portion, the temperature of the peripheral portion and the central portion of the food is similarly increased, and the entire food is uniformly heated.

A heating chamber, high-frequency generating means coupled to the heating chamber, and a heating object mounting table made of a resin material are detachably provided in the heating chamber, and the surface of the heating object mounting table is convex. It has a shape with projections, and a single or a plurality of radio wave concentrators are provided on the back surface of the heated object mounting table, and a frame with a dimension higher than the thickness of the radio wave concentrator is provided on the outer periphery of the back surface of the heated object mounting table It is a thing.

The frame provided on the back surface of the heated object mounting table prevents the radio wave concentrator from being damaged by an impact when the heated object mounting table is dropped.

Further, a heating chamber, a high-frequency generating means coupled to the heating chamber, and a heated object mounting table made of a low dielectric material are detachably provided in the heating chamber, and the surface of the heated object mounting table is detachable. A shape having a plurality of linear projections,
A single or a plurality of radio wave concentrators are provided on the back surface of the heated object mounting table.

By forming the projections on the surface of the heated object mounting table into a plurality of linear projections, even if food residues are attached to the projections, they can be easily cleaned by wiping in parallel with the projections. can do.

A heating chamber, a high-frequency generating means coupled to the heating chamber, and a heating object mounting table made of a low dielectric material are detachably provided in the heating chamber, and the surface of the heating object mounting table is detachable. A shape having a plurality of convex protrusions, the convex protrusions into and out of the heating chamber of the heated object mounting table,
A single or a plurality of radio wave concentrators are provided on the back surface of the heated object mounting table.

The convex projections prevent the food from slipping in the front-rear direction, so that the food can be prevented from sliding and moving when the object to be heated is put in and out of the heating chamber. Thus, uniform heating can always be performed from this surface without deviation of the positional relationship.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-frequency heating apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) As shown in FIG.
1 is provided with a waveguide 12 for guiding high-frequency waves.
Is provided with a magnetron 13 which is an oscillation tube for radio waves. Radio waves from the magnetron 13 are irradiated into the heating chamber 11 through the opening 14. The radio wave stirring blade 15 provided at the upper part of the heating chamber 11 is driven to rotate by a motor 16 to uniformly stir the radio wave. On a shelf 17 formed on the left and right side walls of the heating chamber 11, a heated object mounting table 18 made of a low dielectric constant material such as a heat-resistant resin is detachably held. The surface of the object-to-be-heated mounting table 18 has a shape having convex protrusions. The food 20 is placed on the convex protrusion 19 on the surface.
A radio wave concentrator 21 made of a low-dielectric-constant dielectric material such as resin, borosilicate glass, crystallized glass, or ceramic is provided at a substantially central portion on the back surface of the table 18 to be heated.
Is provided. FIG. 1 shows a configuration in which one radio wave concentrator 21 is provided alone at a substantially central portion. The radio wave concentrator 21 is mounted on the heated object mounting table 1 with a heat-resistant adhesive such as silicon.
8 is fixed by bonding.

FIG. 5 shows a state in which the food 22 is subjected to high-frequency heating in the heating chamber of the high-frequency heating device of the present embodiment. The solid line arrows schematically show the state of radio waves applied to the food 22. A radio wave concentrator 21 made of a dielectric material having a low dielectric constant is provided in the center of the heated object mounting table 18. Since the dielectric has the property of attracting radio waves, the electric field strength near the dielectric becomes higher than other parts.
That is, since the center of the food 22 is effectively heated,
As a result, the whole food is heated uniformly.

The hatched lines indicate the state of heating of the food, which indicates that the outer periphery and the inside of the food are more uniformly heated as compared with the related art.

In particular, in the case of thawing and heating of frozen food in which the food temperature is kept at a minus temperature, the food is heated from the surface portion, and as the thawing proceeds, radio waves are easily absorbed by the moisture on the defrosted surface portion, and Is thawed and the central part is not easily heated, so that uneven thawing is likely to occur. On the other hand, according to the present embodiment, the central portion of the food is also sufficiently heated, so that uniform and uniform thawing heating can be performed. As described above, a high-frequency heating apparatus having extremely high cooking performance such as heating performance and thawing performance can be realized.

The surface of the heated object mounting table 18 has convex protrusions 19.
When the food 22 is placed on the object-to-be-heated mounting table, the food is supported by the convex portion of the object-to-be-heated mounting table. Escapes and adheres to food. As a result, a crisp and excellent heating finish can be obtained without the food becoming wet.

(Embodiment 2) FIG. 2 is a perspective view of a heated object mounting table according to Embodiment 2 of the present invention as viewed from the back. FIG. 2 shows a configuration in which a plurality of radio wave concentrators 24 are provided on the back surface of the object-to-be-heated mounting table 23, and four are provided. This corresponds to the placement positions of the four dispersed foods, and the radio wave concentrator 24 concentrates the radio waves at the center of each food and heats the food uniformly. The surface of the heated object mounting table 23 has a shape having convex protrusions, and a frame 25 having a size higher than the thickness of the radio wave concentrator is provided on the outer peripheral portion of the back surface of the heated object mounting table 23. Thus, even in the case of dropping past the heated object mounting table 23, the frame 25 hits the falling surface first and does not directly hit the radio wave concentrator 24. Even if the radio wave concentrator 24 is made of a material that is easily broken, such as ceramic, a device that does not crack and has high durability can be realized.

Then, when the object-to-be-heated mounting table is placed on a table or the like, the radio wave concentrator does not hit the table and the frame can be stably placed on the table first. When the object-to-be-heated mounting table is installed in the heating chamber, the frame also functions as a rail, and even if this portion protrudes due to the attachment of the radio wave concentrator, it can be smoothly put in and out of the heating chamber without being caught by this.

The frame serves as a positioning guide when the radio wave concentrator is to be fixed to the back surface of the heated object mounting table by bonding. For example, if a jig such as a gauge that fits in a frame is prepared, the gauge can be used to bond and fix the same position.

(Embodiment 3) FIG. 3 is a perspective view of a heated object mounting table according to Embodiment 3 of the present invention as viewed from the front. In FIG. 3, the surface of the heated object mounting table 26 has a shape having a plurality of linear projections 27, and a single or a plurality of radio wave concentrators 28 are provided on the back surface of the heated object mounting table 26. It has a configuration. As a result, the food placed on the object-to-be-heated mounting table 26 is held in a slightly lifted state by the convex protrusions 27, and fats, drips, etc. coming out of the food at the time of heating accumulate in portions without the convex protrusions 27, Convex projections 2 that can be heated without sticking to food and without stickiness
Since 7 has a linear shape, it can be easily cleaned by wiping along the direction of the line during cleaning.

Further, when the object-to-be-heated mounting table is formed from a resin material, the convex projection also serves as a reinforcing rib, which leads to an improvement in the strength of the object-to-be-heated mounting table.

(Embodiment 4) FIG. 4 is a perspective view of a heated object mounting table according to Embodiment 4 of the present invention as viewed from the front. In FIG. 4, the surface of the heated object mounting table 29 has a plurality of linear projections 3.
The protrusion 30 has a shape perpendicular to the direction in which the heated object mounting table 29 enters and exits the heating chamber, and a single or a plurality of radio wave concentrators 31 are provided on the back surface of the heated object mounting table 29. Is provided. The food placed on the heated object mounting table 29 tends to move in the front-rear direction by the operation of putting the mounting table into the heating chamber. In particular, frozen food is very slippery because the surface of the food is frozen. In such a case, the convex protrusions 30 provided in the direction perpendicular to the direction of taking in and out of the heating chamber, that is, in the lateral direction, become obstacles for the movement of the food, and the food slides on the heated object mounting table 29. Can be prevented.

As a result, the positional deviation between the food and the radio wave concentrator 31 is eliminated, the effect of the radio wave concentrator is always stabilized, and uniform heating can be realized.

[0035]

As described above, in the high-frequency heating apparatus according to the present invention, since the radio wave concentrator made of a dielectric material having a low dielectric constant is provided on the back surface of the object-to-be-heated mounting table, the central part of the food can be maintained. Heats more strongly than the surrounding area. Conventionally, the central portion of the food is difficult to pass through and the radio wave is difficult to be heated.In contrast, according to the present invention, the central portion of the food is effectively heated, and as a result, the entire food is uniformly heated. You.

Further, since the radio wave concentrator is provided on the back surface of the object-to-be-heated mounting table, the number of radio wave concentrators, the position thereof, and the large shape can be freely changed. A heated object mounting table having a radio wave concentrator most suitable for food can be easily and freely realized.

As compared with a conventional method of uniformly irradiating radio waves to food and performing uniform heating, such as a radio wave stirrer provided in a heating chamber, the radio waves can be adjusted for each food to be heated. Good heating suitable for food can be realized.

Further, since the radio wave concentrator is made of a dielectric material such as a ceramic material, the radio wave concentrator acts as a dielectric, but generates little heat due to radio waves, and the radio wave concentrator is heated to a high temperature. There is no. In addition, since there is little absorption of radio waves, there is no heating loss, and most radio waves are absorbed by food, so that heating efficiency is high.

As described above, according to the present invention, with a simple structure, thawing and heating can be made uniform according to the food, and a high-frequency heating apparatus with extremely good heating performance and high practicality can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a heated object mounting table according to the second embodiment.

FIG. 3 is a perspective view of a heated object mounting table according to the third embodiment.

FIG. 4 is a perspective view of a heated object mounting table according to the fourth embodiment.

FIG. 5 is a diagram schematically showing the relationship between food and radio waves in the overall embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional high-frequency heating device.

FIG. 7 is a diagram schematically showing a relationship between food and radio waves of the high-frequency heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Heating room 13 Magnetron 17 Shelf 18 Heating object mounting table 19 Convex projection 20 Food 21 Radio wave concentrator 25 Frame

Claims (4)

[Claims] A heating chamber, a high-frequency generating means coupled to the heating chamber, and a heating object mounting table made of a low dielectric constant material detachably provided in the heating chamber; A high-frequency heating device having a surface having convex protrusions and a single or a plurality of radio wave concentrators provided on a back surface of the heated object mounting table. 2. A heating chamber, a high-frequency generating means coupled to the heating chamber, and a heating object mounting table made of a low dielectric constant material are detachably provided in the heating chamber. The surface has a shape having convex protrusions, and a single or a plurality of radio wave concentrators are provided on the back surface of the heated object mounting table, and the radio wave concentrator is provided on an outer peripheral portion of the back surface of the heated object mounting table. A high-frequency heating device with a configuration in which a frame with a dimension higher than the thickness is provided. 3. A heating chamber, a high-frequency generating means coupled to the heating chamber, and a heating object mounting table formed of a low dielectric constant material provided in the heating chamber in a detachable manner. A high-frequency heating device having a surface having a plurality of linear projections, and a single or a plurality of radio wave concentrators provided on a back surface of the object-to-be-heated mounting table. 4. A heating chamber, a high-frequency generating means coupled to the heating chamber, and a heating object mounting table made of a low dielectric constant material detachably provided in the heating chamber. Has a shape having a plurality of linear projections, and the projections are perpendicular to a direction in which the object-to-be-heated is placed in and out of the heating chamber, and a back surface of the object-to-be-heated pedestal. Is a high frequency heating device provided with one or more radio wave concentrators.