JP2001304574A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency heating device capable of effecting heating finishing of a plurality of substances to be heated, having different temperatures at the time of starting heating or different quantities of absorption heat to the same temperature by simultaneous heating. SOLUTION: This high frequency heating device comprises a power feed opening 16; a rotating placing table 6; a temperature detecting means 17 to detect the temperatures of substance 1a and 1b to be heated; and a discriminating means 19 for a temperature difference between the substances 1a and 1b to be heated. Heating is controlled through combination of uniform heating of the substances 1a and 1b to be heated through rotation of the placing table 6 and centralized heating of the substance 1b to be heated on the low temperature side by stopping rotation of the placing table 6. This constitution perform simultaneous heating of the two substances 1a and 1b to be heated having different temperatures at the time of starting heating or different quantities of absorption heat and can heat finish them to approximately the same temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus for simultaneously heating a plurality of different objects to be heated at different heating start temperatures and different amounts of heat absorption, and finishing them at the same temperature.

[0002]

2. Description of the Related Art Conventionally, as a heating device of this kind, for example,
There is one disclosed in JP-A-9-27389.

As shown in FIGS. 9 and 10, a plurality of power supply ports for supplying high-frequency radio waves are provided, and the temperature distribution is eliminated by alternately switching the power supply ports to perform centralized heating or distributed heating. It is intended for heating an object to be heated.

In FIG. 1, a temperature detecting means 2 for an object to be heated 1 is shown.
And a plurality of power supply ports 4 for supplying electromagnetic waves to the heating chamber 3, and a distribution changing means 5 for changing the position of the power supply port 4. And a power supply port 4 for supplying high-frequency radio waves
The power supply port 4 is alternately switched to perform centralized heating or distributed heating to eliminate the temperature distribution. The temperature of the peripheral portion of the heated object 1 on the rotating mounting table 6 becomes high. In this case, the power supply port 4a is opened to switch to the central heating of the central portion. Also, when the temperature of the central portion of the heated object 1 on the rotating mounting table 6 becomes high, the power supply port 4b is opened to perform distributed heating over a wide range. It switches and heats.

FIGS. 11 to 13 show other examples.
3 shows a heating example in the case of the mounting table 7 which does not rotate. A shield plate 9 having an opening as the power supply port 8a and a shield plate 10 having an opening as the power supply port 8b are provided. The shield plates 9 and 10 are rotated in combination. Then, the central portion of the power supply port 8a is switched so as to become an opening, and when the temperature of the central portion of the article 1 to be heated becomes high, the peripheral portion of the power supply port 8a is switched so as to become an opening.

[0006]

However, the former of the above-mentioned prior art shown in FIGS. 9 to 13 is based on the principle that all the heating is performed by rotating the mounting table to uniformly heat the object to be heated. When this occurred, the heating was switched to concentrated heating or dispersion heating to eliminate the temperature distribution.

In the latter conventional example, the power supply port is moved by a mounting table system in which all the heating is not rotated, and the object to be heated is basically heated uniformly. Alternatively, the temperature was switched to a peripheral portion and concentrated heating was performed to eliminate the temperature distribution. However, in the above-mentioned conventional example, the power supply port is moved and rotated, and the waveguide 12, the power supply ports 8a, 8b, and the like are directly connected to the high-frequency generation means 11 and are places with extremely high electric field strength.
As described above, moving the waveguide 12 and the power supply port made of metal (difficult to use other than metal) at a position where the electric field strength is strong is likely to cause phenomena such as heat generation and spark due to electric field concentration. Is very difficult to put into practical use.

[0008] Furthermore, in the two configurations of the prior art, the same applies to the case where a plurality of objects to be heated having different heat absorptions, such as milk in a large cup and milk in a small cup, are simultaneously heated. However, it is not possible to simultaneously heat a plurality of objects to be heated and finish them at the same temperature.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem, and eliminates the movement and rotation of a power supply port, and simultaneously allows a plurality of objects to be heated in different states such as when a heating start temperature is different and / or when a heat absorption amount is different. It is an object of the present invention to provide a high-frequency heating device that can be heated to the same temperature even when heated.

[0010]

According to the present invention, in order to solve the above-mentioned problems, when a plurality of objects to be heated are simultaneously heated, the object to be heated having the lowest temperature at least at a certain stage of the heating is subjected to the highest frequency radio wave. Heating was performed at a strong position to eliminate the temperature difference between the objects to be heated.

According to the above invention, when a plurality of objects to be heated having different temperatures at the start of heating are simultaneously heated and / or when a plurality of objects to be heated having different amounts of heat absorption are simultaneously heated, the heating is substantially completed. Heating to the same temperature makes it very convenient. Further, since the power supply port is not changed, phenomena such as heat generation and spark due to electric field concentration do not occur, and it can be realized with a simple structure.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of objects having different temperatures at the start of heating are simultaneously heated, and a plurality of objects having different heat absorptions are simultaneously heated. In order to heat and finish the heated object at substantially the same temperature, the object to be heated at the lowest temperature is heated at a position where the high frequency radio wave is strongest at least at a certain stage of the heating.

[0013] Then, since the object to be heated having a low temperature is concentratedly heated at a position where the high frequency radio wave is strong, the temperature of that part increases, and the temperature of the object to be heated can be easily made substantially the same as the temperature of the other objects to be heated. .

Further, a heating chamber for accommodating the object to be heated, a power supply port, a mounting table for mounting the object to be heated, a rotation and stop mechanism for the mounting table, a means for detecting the temperature of the object to be heated and a means for determining a temperature difference. Heating control that combines the uniform heating of all objects to be heated by the rotation of the mounting table and the centralized heating of the low-temperature-side heated objects that stops the rotation of the mounting table at a position where high-frequency radio waves are strong It was configured to finish by heating to the temperature.

[0015] Examples of different temperatures at the start of heating include frozen rice and cold miso soup, frozen rice and chilled hamburgers, or different heat absorption amounts such as milk in a large cup and milk in a small cup. Can be heated to the same temperature by simultaneous heating, which is very convenient.

In the case of concentrated heating, an address is added to the mounting table, and when the heating means is started by uniform heating by rotation of the mounting table and the determining means determines a temperature difference, the address on the low temperature side (heated object) is supplied to the power supply port. When it comes to a position in the vicinity, the rotation of the mounting table is stopped and the object to be heated at that address is heated intensively.

The mounting table is controlled so that the object to be heated on the low-temperature side is stopped at the position of the power supply port where the electric field intensity is the strongest. Such a phenomenon does not occur, and simultaneous heating and heating to the same temperature can be achieved by a simple structure without complicated mechanisms such as a waveguide moving means and a power supply port position changing means, which is very convenient.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing the configuration of a high-frequency heating apparatus according to an embodiment of the present invention, FIG. 2 is an operation block diagram, FIG. 3 is a number map provided on a mounting table, and FIG. Figure,
5 is a conceptual diagram of a plurality of objects to be heated having different heating start temperatures during uniform heating, FIG. 6 is a conceptual diagram of the same concentrated heating, and FIG. 7 is a conceptual diagram of uniform heating of large and small cups having different heat absorption amounts. 8 is a conceptual diagram at the time of the concentrated heating.

In FIG. 1, reference numerals 1a and 1b denote objects to be heated such as foods. In this embodiment, 1b is lower in temperature than 1a. These are mounted on a mounting table 6 in the heating chamber 3. The mounting table 6 is configured to rotate in the heating chamber 3 by the rotation mechanism 13 to rotate the objects to be heated 1a and 1b. The high-frequency generator 14 is connected to the heating chamber 3 via a waveguide 15 and supplies power from a power supply port 16. A temperature detecting means 17 is provided above the waveguide 15. The temperature detecting means 17 includes an opening 1 provided on the wall surface of the heating chamber 3.
The temperature of the objects to be heated 1a and 1b is detected by detecting infrared rays and the like from the objects to be heated 1a and 1b passing through the portion 8. The temperature detecting means 17 includes a plurality of elements and is provided so as to detect infrared rays and the like from four points corresponding to substantially the radius of the mounting table 6.

FIG. 2 shows an operation block in which a temperature difference is determined by a determination means 19 such as a microcomputer based on a signal from the temperature detection means 17. The control means 20 functions based on the information to control the high frequency generator 14 and the rotating mechanism 13.

FIG. 3 shows the mounting table 6 equally divided in the circumferential direction, to which addresses are added. As an example, the number is 20 in total. Usually, the object to be heated is placed over a plurality of addresses. Then, the temperature of the object to be heated is detected by the temperature detecting means 17, and it is assumed that the temperature of the address is detected.

In the sectional view of the main part of the temperature detecting means 17 shown in FIG. 4, four elements 22 for detecting infrared rays are provided in a metal case 21 and a window 23 made of silicon or the like is provided.
Detects infrared light passing through. A lens 24 made of plastic or the like that transmits infrared rays is provided outside the window 23. The lens 24 detects the temperatures of four points of approximately the radius of the mounting table 6 on which the elements 22 rotate. It is configured as follows.

If the temperature measurement range of the element 22 for detecting infrared rays is larger than a circle having a diameter of about 3 cm, the accuracy of discriminating the temperature is reduced and the error is increased. Also,
Narrowing the range improves accuracy but increases cost. Usually, the radius of the food dish of the high-frequency heating device is about 15 cm, and to measure the temperature of the entire radius, five elements 22 for detecting infrared rays are required.
This is the case where four pieces are used except for the end of the placing plate. As described above, the number of elements is not limited to the number in this embodiment, but may be determined according to the size of the mounting plate and the required accuracy.

Next, the operation and operation will be described.

When the uniform heating by the rotation of the mounting table 6 is started, the temperature detecting means 17 detects infrared rays and the like from four points of approximately the radius of the mounting table 6, and if the mounting table 6 makes one rotation, the temperature detecting means 17 is placed on the mounting table 6. The temperature of the object to be heated 1 can be detected. At this time, the user looks at the address and substitutes the objects to be heated 1a and 1b.

The control means 20 determines the temperature difference by the determining means 19 based on the detected signals of the temperatures of the plurality of objects to be heated 1a, 1b. The rotation mechanism 13 of the mounting table 6 is controlled so as to stop when it comes to the vicinity of the power supply port 16 where the strength is strong, thereby performing concentrated heating.

Thus, by temporarily concentratedly heating the low-temperature-side heated object 1b, the temperature difference is reduced and the plurality of heated objects 1a and 1b are simultaneously heated and the same temperature is realized.

As shown in FIGS. 5 and 6, a case where frozen rice (minus 20 ° C.) 25 and cold miso soup (plus 5 ° C.) 26 are placed on the mounting table 6 and heated simultaneously will be described. Immediately after the mounting table 6 starts heating while rotating, the temperatures of the plurality of objects to be heated 25 and 26 can be detected. When the temperature difference is determined, the mounting table 6 is stopped near the power supply port 16 where the frozen rice 25 has the strongest electric field strength, and the concentrated heating is temporarily performed. As a result, the temperature difference is reduced, and as an example, when the temperature difference becomes a predetermined value or less,
While rotating the mounting table 6 by controlling the rotation mechanism 13, the two objects to be heated 25 and 26 are evenly heated to finish the heating to the same desired temperature.

As shown in FIGS. 7 and 8, when a plurality of objects to be heated having different heat absorptions are simultaneously heated, milk 27 in a large cup and milk 28 in a small cup on the mounting table 6 are mixed. In the case of simultaneous heating, first, the temperature of the plurality of objects to be heated 27 and 28 can be detected immediately after the mounting table 6 starts rotating to uniformly heat the plurality of objects to be heated 27 and 28. Thereafter, the temperature difference gradually increases because the amount of the milk 27 in the large cup is larger and the temperature rise is smaller. When this temperature difference is determined, for example, when the temperature difference becomes a predetermined value or more, the milk 2 in a large cup
7, that is, on the low temperature side, the mounting table 6 is stopped near the power supply port 16 where the electric field intensity is the strongest, and the concentrated heating is temporarily performed. As a result, the temperature difference is reduced. For example, when the temperature difference becomes equal to or less than a predetermined value, both the objects to be heated 27 and 28 are uniformly heated while rotating the mounting table 6 by controlling the rotating mechanism 13 to obtain a desired temperature. This is to finish by heating to the same temperature. Depending on the size, these heatings may be repeated.

As described above, examples of different temperatures at the start of heating include frozen rice and chilled miso soup, frozen rice and chilled hamburger, frozen shumai and cold rice in a heating scene common in daily life. And simultaneous heating and finishing at the same temperature is very convenient. Further, as an example of different heat absorption, even in the case of milk in a large cup and milk in a small cup, heating can be finished to the same temperature at the end of simultaneous heating, which is very convenient. In addition, since the power supply port is not changed, there is no occurrence of phenomena such as heat or sparks due to electric field concentration, and a simple structure without complicated mechanisms such as waveguide moving means and power supply port position changing means. realizable.

As described above, in the present embodiment, the case where two objects to be heated in different states are simultaneously heated has been described. However, when three objects to be heated in different states are simultaneously heated, the two objects to be heated are simultaneously heated. It may be performed according to the case. That is, after evenly heating the three objects to be heated, the heating object having the lowest temperature is intensively heated, so that the uniform heating and the intensive heating are repeated as appropriate so that even if the simultaneous heating is performed, the temperature becomes substantially the same. Can be heated and finished. The same applies to the case where four objects to be heated in different states are heated simultaneously.

[0033]

As described above, according to the present invention, the following effects are obtained.

The present invention relates to a case where a plurality of objects having different temperatures at the start of heating are simultaneously heated and a case where a plurality of objects having different heat absorptions are simultaneously heated. In order to finish the heating of the object to be heated to substantially the same temperature, the object to be heated having the lowest temperature is heated at a position where the high frequency radio wave is strongest at least at a certain stage of the heating.

Since the object to be heated having a low temperature is concentratedly heated at a position where the high-frequency radio wave is strong, the temperature of that portion rises, and the temperature of the object to be heated can be easily made substantially the same as the temperature of the other objects to be heated. .

Further, a heating chamber for accommodating the object to be heated, a power supply port, a mounting table for mounting the object to be heated, a rotation and stop mechanism for the mounting table, a means for detecting the temperature of the object to be heated and a means for determining the temperature difference Heating control that combines the uniform heating of all objects to be heated by the rotation of the mounting table and the centralized heating of the low-temperature-side heated objects that stops the rotation of the mounting table at a position where high-frequency radio waves are strong It is designed to finish by heating to the temperature.

In the past, there were various problems caused by the separate heating, but this problem can be solved. A plurality of heated foods can be eaten in half the time up to now. Furthermore, a plurality of foods can be eaten deliciously because they are simultaneously brought to a temperature suitable for eating. It is also very convenient, especially in families with many families.

In the case of concentrated heating, an address is added to the mounting table. If the temperature means determines a temperature difference after the heating is started by uniform heating by rotation of the mounting table, the low-temperature address (heated object) is supplied to the power supply port. When it comes to a nearby position, the rotation of the mounting table is stopped and the object to be heated at that address is heated intensively.

The mounting table is controlled so that the object to be heated on the low-temperature side is stopped at the position of the power supply port where the electric field intensity is the strongest. Simultaneous heating and heating at the same temperature are possible with a simple structure, not a complicated mechanism such as a position changing means, and the practical value is large.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-frequency heating device according to an embodiment of the present invention.

FIG. 2 is an operation block diagram of the high-frequency heating device.

FIG. 3 is a diagram showing an example of addresses provided on a mounting table of the high-frequency heating device.

FIG. 4 is a sectional view of a main part of a temperature detecting means of the high-frequency heating device.

FIG. 5 is a conceptual diagram of uniform heating of a plurality of objects to be heated having different heating start temperatures of the high-frequency heating device.

FIG. 6 is a conceptual diagram of concentrated heating of the high-frequency heating device.

FIG. 7 is a conceptual diagram of uniform heating of large and small cups having different heat absorption amounts of the high-frequency heating device.

FIG. 8 is a conceptual diagram of concentrated heating of the high-frequency heating device.

FIG. 9 is a sectional view of a conventional heating device.

FIG. 10 is a plan view of the power supply port.

FIG. 11 is a sectional view of another conventional heating device.

FIG. 12 is a plan view of the shielding plate.

FIG. 13 is a plan view of the shielding plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 object to be heated 3 heating chamber 6 mounting table 13 rotation mechanism 16 power supply port 17 temperature detection means 19 determination means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K086 AA01 BA02 BA08 BB02 BB08 CA04 CA15 CB04 CB15 CC01 CC06 CD04 CD11 CD19 CD27 DA02 3L086 AA02 AA04 BB04 BF07 CB08 CB10 CB16 CC03 CC06 CC08 CC12 DA12 DA29

Claims (3)

[Claims] 1. A method for simultaneously heating a plurality of objects having different temperatures at the start of heating and / or for simultaneously heating a plurality of objects to be heated having different amounts of heat absorption. A high-frequency heating apparatus that heats an object to be heated at the lowest temperature at least at a certain stage at a position where the high-frequency radio wave is strongest in order to finish the object to be heated to substantially the same temperature. 2. A heating chamber for storing an object to be heated, a power supply port,
A mounting table on which the object to be heated is mounted, a mechanism for rotating and stopping the mounting table, a means for detecting the temperature of the object to be heated, and a means for determining a temperature difference. A high-frequency heating device configured to heat to almost the same temperature by heating control in combination with concentrated heating of a low-temperature-side heated object that stops rotation of the mounting table at a position where radio waves are strong. 3. An address is added to the mounting table, and after the heating is started by uniform heating by rotation of the mounting table, if the determining means determines a temperature difference, the low-temperature side address (the object to be heated) is located at a position near the power supply port. 3. The high-frequency heating apparatus according to claim 2, wherein when it comes, the rotation of the mounting table is stopped and the object to be heated at that address is concentratedly heated.