JPH06275376A - Heating system - Google Patents

Abstract

PURPOSE:To effectively and quickly heat a substance-to-be-heated by realizing the combined heating of an electromagnetic wave and a heater. CONSTITUTION:According to the signal of the position detecting means 7 of a placing mount 8 on which a substance-to-be-heated 4, by a control part 9, the position, and shape or action velocity, etc., of the matching means (metallic plate) 5 in a waveguide 2 are changed via a drive part 6, and the matching condition of the impedance between a heating chamber 3 and a radio-frequency radiation part (magnetron) 1 is optimized. This easily realizes a heating method that the internal temperature of a substance-to-be-heated is quickly increased by radio wave heating and then baking is completed by heating by heater 10, achieving cooking time shortening and a good heating condition of a substance- to-be-heated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for heating an object to be heated such as food by electromagnetic waves and a heater.

[0002]

2. Description of the Related Art Conventionally, this type of heating device has a structure as shown in FIG. The radio wave emitted from the radio wave radiation unit 1 heats the food 4 in the heating chamber 3 via the waveguide 2. At this time,
The matching means 5 provided in the waveguide 2 for changing the matching state between the radio wave radiating part 1 and the heating chamber 3 has an optimum matching state for the food 4 on the turntable 13 below the heating chamber. Was set to.

By the way, in the case of heating only by the heater, it takes a very long time to raise the temperature of the heating chamber and to obtain a good heating state by raising the temperature of the food. It is conceivable to use a heater in combination, but in this case, the food 4 was placed on the turntable 13 to be heated by electromagnetic waves to raise the internal temperature of the food 4, and then baked by the heater 10.

[0004]

However, in the above-mentioned conventional structure, when heating with a turntable, it takes time to bake with the heater because the heater and the food are separated from each other. There was a problem that the combined use would not significantly reduce the time.

When heating in a metal oven pan above the heating chamber, the distance between the heater and the food becomes short, but the matching state between the radio wave emitting section and the heating chamber changes depending on the position of the oven pan during electromagnetic wave heating. There is a problem in that it is not possible to efficiently supply radio waves, and since the oven dish is made of metal, the radio waves are reflected and the food undergoes extreme heating unevenness.

The present invention solves the above-mentioned problems, and in order to enable the combined heating of electromagnetic waves and a heater, it is necessary to realize a heating device which heats food efficiently and quickly by placing a mounting table above the heating chamber. Is the first purpose.

A second object is to eliminate extreme heating unevenness.

[0008]

In order to achieve the above object, the heating device of the present invention has the following constitution.

That is, a heating chamber having a mounting table on which an object to be heated is placed, a radio wave radiating section for radiating an electromagnetic wave, a waveguide for guiding the electromagnetic wave radiated from the radio wave radiating section into the heating chamber, A heater that raises the ambient temperature in the heating chamber, a detection unit that detects the position of the mounting table, a matching unit that is provided in the waveguide and that changes a matching state between the radio wave radiation unit and the heating chamber, and In the case where the driving unit for moving the matching unit and the control unit for giving a signal to the driving unit based on the signal of the detection unit to control the operation of the matching unit, and placing the mounting table above the heating chamber. Has a configuration in which at least one of the position, shape, and operation speed of the matching means is changed by the drive section based on the signal of the detection means, and electromagnetic waves are efficiently guided to the object to be heated.

Further, a heating chamber having a mounting table on which an object to be heated is placed, a radio wave radiating section for radiating electromagnetic waves, a waveguide for guiding the electromagnetic waves radiated from the radio wave radiating section into the heating chamber, A heater that raises the ambient temperature in the heating chamber, a matching unit that is provided in the waveguide and that changes a matching state between the radio wave radiation unit and the heating chamber, a driving unit that moves the matching unit, and the mounting table In the case where the mounting table is placed above the heating chamber, it is provided with an input means for inputting a position and a control section for controlling the operation of the matching means by giving a signal to the drive section based on the signal of the input means. At least one of the position, shape, and operating speed of the matching means is changed by the drive section based on the signal from the input means, so that electromagnetic waves are efficiently guided to the object to be heated.

Further, at least a portion of the mounting table on which the object to be heated is mounted is made of a non-metal body through which radio waves are transmitted, and the control unit is driven by the control unit based on a signal of the position detecting unit of the mounting table or the input unit. The operation of the matching means is controlled by changing the matching state between the radio wave radiating part and the heating chamber to efficiently guide the electromagnetic wave to the object to be heated above the mounting table and to uniformly heat the object.

[0012]

The present invention has the following functions due to the above construction.

That is, the heating device of the present invention automatically detects or inputs the position of the mounting table on which the object to be heated is mounted, so that the position and shape of the matching means in the waveguide can be adjusted according to the position of the mounting table. Or, by changing the operation speed, etc., the impedance matching condition between the heating chamber and the radio wave radiation part is optimized to improve the efficiency of radio wave supply to the object to be heated, so that the object to be heated can be efficiently radioed above the heating chamber. Along with heating, it has the effect of heating with a heater.

Further, the position, shape or operating speed of the matching means in the waveguide is changed according to the signal from the detecting means or the input means of the position of the mounting table on which the object to be heated is placed, and the heating chamber and the radio wave are changed. The impedance matching condition with the radiating part is optimized to improve the efficiency of radio wave supply to the object to be heated, and at least the part of the mounting table on which the object to be heated is placed is made of a non-metal body that transmits radio waves. As a result, it has the effect of heating the object to be heated by radio waves with extremely high efficiency and without uneven heating.

[0015]

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

FIG. 1 shows a first embodiment of the present invention. Figure 1
In, the radio wave emitted from the magnetron 1 as the radio wave radiating section heats the food 4 in the heating chamber 3 via the waveguide 2. At this time, there is a metal plate 5 which is a matching means in the waveguide 2, which is rotationally driven by a stepping motor 6 which is a drive unit to stir an electric wave and change the impedance matching state between the magnetron 1 and the heating chamber 3. I am letting you. That is, the metal plate 5 is driven so that the impedance matching between the magnetron 1 and the heating chamber 3 containing the food 4, which is the load, is in the optimum state as much as possible. The plate position detecting means 7 detects the position of the oven plate 8 on which the food 4 is placed and sends the detection signal to the control unit 9. The control unit 9 stores in advance the operation of the metal plate 5 that creates an optimum matching state (a state in which impedance matching is performed as much as possible and radio waves are efficiently supplied to the object to be heated) for each position of the oven dish 8. Cage,
A control signal is given to the stepping motor 6. Also,
The control unit 9 controls the radio wave oscillation of the magnetron 1.
With this configuration, since efficient radio wave heating can be performed with the oven dish 8 installed above the heating chamber 3, the internal temperature of the object to be heated is raised by the radio wave heating, and then the heater 10 is used as it is for heating. It can be heated (convection or radiant heating). Therefore, radio wave heating can be performed with the oven dish 8 installed near the heater 10, and strong heater heating can be performed by the heater 10, so that cooking time can be shortened.

FIG. 2 shows a second embodiment of the present invention. This is an example in which input means 11 for inputting the position of the oven dish 8 is used instead of the dish position detection means 7 of FIG. Oven plate 8
By manually inputting the position of, the same effect as the first embodiment can be obtained.

FIG. 3 shows a third embodiment of the present invention. In the configuration of the first embodiment, at least a portion of the oven dish 8 on which the food 4 is placed is configured by a mounting table made of a non-metal body 12 that transmits radio waves. With this configuration, the matching state between the magnetron 1 and the heating chamber 3 can be optimized by the metal plate 5, and since the radio wave is transmitted through the oven plate 8, it is possible to perform even and efficient radio wave heating. After the internal temperature of the object to be heated is raised by radio wave heating, it can be heated by the heater 10 as it is, the cooking time can be further shortened, and an extremely good heating state of the food 4 can be obtained. be able to.

The term "above the heating chamber" as used in the present invention means not less than 1/3 and not more than 3/4 of the height of the heating chamber. When the height is lower than 1/3, the cooking time becomes longer because the distance from the heater is too large. 3 / of the height of the heating chamber
This is because when the height is higher than 4, the heating (baking) unevenness is likely to occur because the distance from the heater is too short. The case where the height of the heating chamber is 1/2 or more and 2/3 or less is a very preferable case when the heating time and the heating unevenness are comprehensively considered.

[0020]

As described above, the heating device of the present invention has the following effects.

(1) By automatically detecting or inputting the position of the mounting table on which the object to be heated is mounted, the position, shape or operating speed of the matching means in the waveguide can be determined according to the position of the mounting table. By changing the impedance and optimizing the matching state of the impedance between the heating chamber and the radio wave radiating part, the object to be heated placed on the mounting table can be efficiently radio wave heated above the heating chamber. It is possible to easily realize a heating method in which the internal temperature of the product is rapidly raised and then baked by heating with a heater (convection or radiant heating) of the heater, and as a result, the cooking time is shortened and good heating A heated state is obtained.

(2) The position, shape or operating speed of the matching means in the waveguide is changed according to a signal from the detecting means or the input means of the position of the mounting table on which the object to be heated is placed, and the heating chamber and In addition to optimizing the impedance matching state with the radio wave radiating part, since at least the part of the mounting table on which the object to be heated is mounted is composed of a non-metal body that transmits radio waves, the object to be heated placed on the mounting table is It is possible to uniformly and efficiently perform radio wave heating above the heating chamber, and it is possible to easily realize a heating method in which the internal temperature of the object to be heated is rapidly raised by radio wave heating and then baked by the heater heating of the heater, As a result, the cooking time can be further shortened, and an extremely good heating condition of the object to be heated can be obtained.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a heating device according to another embodiment of the present invention.

FIG. 3 is a configuration diagram of a heating device according to another embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional heating device.

[Explanation of Codes] 1 magnetron (radio wave radiating part) 2 waveguide 3 heating chamber 4 food (object to be heated) 5 metal plate (matching means) 6 stepping motor (driving part) 7 plate position detecting means (detecting means) 8 Oven dish (mounting table) 9 Control unit 10 Heater 11 Input means 12 Non-metal body 13 Turntable

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriyuki Yoneno 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A heating chamber having a mounting table on which an object to be heated is placed, a radio wave radiating section for radiating electromagnetic waves, a waveguide for guiding the electromagnetic waves radiated from the radio wave radiating section into the heating chamber, and A heater that raises the ambient temperature in the heating chamber, a detection unit that detects the position of the mounting table, a matching unit that is provided in the waveguide and that changes a matching state between the radio wave radiation unit and the heating chamber, and In the case where the driving unit for moving the matching unit and the control unit for giving a signal to the driving unit based on the signal of the detection unit to control the operation of the matching unit, and placing the mounting table above the heating chamber. Is a heating device configured to efficiently guide an electromagnetic wave to an object to be heated by changing at least one of a position, a shape and an operating speed of the matching means by the drive section based on a signal of the detection means. 2. A heating chamber having a mounting table on which an object to be heated is placed, a radio wave radiating section for radiating electromagnetic waves, a waveguide for guiding the electromagnetic waves radiated from the radio wave radiating section into the heating chamber, A heater that raises the ambient temperature in the heating chamber, a matching unit that is provided in the waveguide and that changes a matching state between the radio wave radiation unit and the heating chamber, a drive unit that moves the matching unit, and In the case where the mounting table is placed above the heating chamber, it is provided with an input means for inputting a position and a control section for controlling the operation of the matching means by giving a signal to the drive section based on the signal of the input means. A heating device configured to efficiently guide an electromagnetic wave to an object to be heated by changing at least one of a position, a shape, and an operation speed of the matching means by the drive section based on a signal from the input means. 3. The heating device according to claim 1, wherein at least a portion of the mounting table on which the object to be heated is mounted is made of a non-metal body that transmits radio waves.