JPS6346557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking device equipped with microwave and short wave oscillators.

Conventionally, this type of cooking device has a microwave generator 31 provided in the main body 1, as shown in FIG.
Generally, the microwaves generated in the heating chamber 2 are supplied to heat the object 15 to be heated, or the object to be heated is cooked using an electric heater provided in the heating chamber 2.

Furthermore, as shown in FIG. 4, by rotating an antenna 5 that oscillates microwaves through a waveguide 4 using a motor 6 or the like, the distribution state of the microwaves supplied into the heating chamber 2 is improved. A cooking device for cooking the heated object 15 has also been invented.

However, when the object to be heated 15 in such a heating cooker is a frozen food, when the frozen food is irradiated with microwaves, only the surface of the frozen food is thawed quickly because the microwaves do not penetrate into the inside of the frozen food. When irradiated with microwaves, the surface becomes boiled. Therefore, there is a drawback that it is not possible to uniformly thaw and cook frozen foods.

The present invention solves these drawbacks of conventional heating cookers, and includes a microwave oscillator that supplies microwaves and a shortwave oscillator that supplies short waves in the heating chamber, and a part of the bottom wall of the heating chamber is One electrode of the short wave oscillator and the other electrode are provided on the upper wall of the heating chamber so as to be able to move up and down, each electrode is electrically insulated from the heating chamber wall, and a chiyoke groove is provided in this insulating part to shield microwaves. By providing this, microwaves are prevented from leaking out of the main body from the insulating part when cooking with microwaves, and the shortwaves irradiated from the shortwave oscillator prevent the microwaves from leaking to the inside of the object, such as frozen foods. To provide a heating cooker configured to allow thawing and cooking.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a main body of a heating cooker, and a door 3 is provided at the opening of a heating chamber 2 provided in the main body 1 so as to be openable and closable. Reference numeral 4 denotes a waveguide provided above the heating chamber 2. Microwaves generated by a microwave generator pass through the waveguide 4 and are irradiated into the heating chamber 2 from an antenna 5 used as a microwave oscillator. 6 is a motor that rotates the antenna 5. Reference numeral 7 denotes a bearing for the antenna 5, which is made of a low-loss dielectric material. Reference numeral 8 denotes a lower electrode which also serves as the bottom wall of the heating chamber 2 and is used as a short wave oscillating part.
The heating chamber bottom walls 9 and 10 are electrically insulated by an insulating material 11. A chiyoke groove 12 is provided in the insulating portion of the lower electrode 8 to prevent microwaves emitted from the antenna 5 from leaking outside the main body 1. Reference numeral 13 denotes an upper electrode provided on the upper wall 14 of the heating chamber and used as a short wave oscillator, which generates a short wave electric field between it and the lower electrode 8 to generate the object to be heated 15
is heated dielectrically.

Further, an insulating material 16 is provided at the penetration portion where the upper electrode 13 penetrates the heating chamber upper wall 14.
4 and the upper electrode 13 are electrically insulated by an insulating material 16. A coaxial chiyoke groove 17 is provided in the insulating portion of the upper electrode 13 to prevent microwaves oscillated from the antenna 5 from leaking. 18 is a spring that supports the upper electrode 13; 19 is a lever that operates the upper electrode 13;
9 engages with a front lever 21 provided on an operation panel 20 on the front side of the main body 1. Therefore, by operating this front lever 21, the height of the upper electrode 13 can be set arbitrarily.

FIG. 2 shows a heating cooker showing another embodiment of the present invention, in which a gear A22 is provided at the end of the upper electrode 13, and a gear B23 that meshes with this gear A22 is rotated by a motor (not shown). The structure is such that the upper electrode 13 can be moved up and down.

By configuring the heating cooker of this embodiment in this manner, the following effects can be obtained.

1. Cooking can be done by taking advantage of the features of short waves and microwaves. In particular, when frozen food is thawed and cooked using short waves, the short waves penetrate into the inside of the frozen food, so that the surface of the frozen food is uniformly cooked without being boiled. wall 9,10
Since the chiyoke grooves 12 and 17 are provided in the insulating part between them, the microwaves irradiated from the antenna 5 are prevented from leaking outside the main body 1, so it is safe.

2. The upper electrode 13 is configured to be movable up and down by operating the front lever 21 provided on the operation panel 20 or by the gear B23 whose drive source is a motor (not shown), so that the object to be heated 15 can be moved up and down. The height of the upper electrode 13 can be arbitrarily set depending on the size. Since the short wave impedance (resistance, reactance) of the heated object 14 is greatly related to the proportion of the air layer between the electrodes,
The height of the upper electrode 13 is arbitrarily adjusted according to the height of the object to be heated 15, and the object to be heated 15 and the upper electrode 1 are
If the thickness of the air layer between the heating elements 3 and 3 is reduced, fluctuations in the impedance of the heated object 15 will be reduced. Therefore, if the maximum value of the oscillation efficiency of the short-wave oscillator is designed as the representative load (water) impedance, an efficient heating cooker can be designed for any object to be heated 15.

3. Depending on the size and shape of the heating chamber 2, the upper electrode 13 can be made so as not to have a negative effect on microwave heating.

4. Since the lower electrode 8 also serves as the bottom wall of the heating chamber 2, even if boiled over from the heated object 15, etc., it can be easily cleaned.

5. The vertical movement of the upper electrode 13 can be easily operated by the front lever 21 provided on the operation panel 20, and the structure is simple, so that no increase in cost occurs.

As is clear from the above description, the cooking device of the present invention is provided with a microwave oscillator that supplies microwaves and a shortwave oscillator that supplies shortwaves in the heating chamber, and one electrode of the shortwave oscillator is connected to the bottom wall of the heating chamber. The other electrode is provided on the upper wall of the heating chamber so as to be movable up and down, each of the electrodes is electrically insulated from the wall of the heating chamber, and a chiyoke groove is provided in this insulating part. Cooking with microwaves and short waves can be used depending on the object to be heated.Moreover, when thawing and cooking frozen foods and other objects to be heated, short waves can penetrate into the inside of the object. It is possible to uniformly thaw and cook the object without causing only the surface of the object to become stewed.

In addition, by electrically insulating the electrode of the short wave oscillator and the wall of the heating chamber, and by providing a chiyoke groove in this insulating part, the microwave does not leak outside the main body even when cooking with microwaves. It is safe because no sparks are generated between the electrode and the heating chamber wall.

Furthermore, by providing the electrode on the upper wall of the heating chamber so that it can move up and down, the height of this electrode can be adjusted according to the size of the object to be heated, allowing efficient heating and cooking. can.

Furthermore, since one electrode of the short wave oscillator constitutes the bottom wall of the heating chamber, it is possible to provide an easy-to-use heating cooker that can be easily cleaned even if juice spills from the heated object during cooking. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a heating cooker showing one embodiment of the present invention, FIG. 2 is a sectional view of a heating cooker showing another embodiment of the invention, and FIGS. 3 and 4 are sectional views of a heating cooker showing another embodiment of the invention. It is a sectional view of a cooking device showing a conventional example. 1... Main body, 2... Heating chamber, 5... Antenna (microwave oscillator), 8... Lower electrode (electrode),
9, 10... Heating chamber bottom wall, 12... Chiyoke groove,
13... Upper electrode (electrode), 14... Upper wall of heating chamber,
17... Coaxial type chiyoke groove (chiyoke groove).

Claims (1)

[Claims] 1. A heating chamber provided in the main body, a microwave oscillator that supplies microwaves into the heating chamber, a shortwave oscillator that supplies shortwaves, and a two-pole oscillator that constitutes the oscillation part of the shortwave oscillator. one electrode of the short wave oscillation section is provided on the bottom wall of the heating chamber, the other electrode is provided on the top wall of the heating chamber so as to be movable up and down, and electrically insulates between each of the electrodes and the wall of the heating chamber. This heating cooker is equipped with a chiyoke groove in this insulating part to shield microwaves. 2. The cooking device according to claim 1, wherein the electrode provided on the upper wall of the heating chamber can be moved up and down by operating a lever provided on an operation panel on the front surface of the main body. 3. The cooking device according to claim 1, wherein the electrode provided on the upper wall of the heating chamber is movable up and down using a motor as a driving source.