JPS63156930A - Cooking apparatus - Google Patents

Abstract

PURPOSE:To radiate a microwave from an exciting port uniformly onto a food- stuff so as to heat the same uniformly by fixing the base part of a heater provided in the heating chamber of the cooking apparatus to a waveguide through the exciting port and using the heater as a radiation antenna for the microwave. CONSTITUTION:A microwave oscillated from a microwave oscillator 5 is guided to an exciting port 4 through a waveguide 6 and introduced into a heating chamber 2. At this time, the microwave is transmitted to the waveguide 6, the base part 13b of a heater 13, and a heat generating part 13a thereof, in this order, and the heater plays a role of microwave radiation antenna, and is radiated into the heating chamber 2 in a wide range. As a result, even in the case of a fixed-type shelf plate, a food-stuff 12 to be heated placed thereon, can be uniform heated. Further, since the distance between the heater 13 and the ceiling surface 14, A lambda/6-lambda/4 (lambda: microwavelength) is a highest value of radiation efficiency from the heater 13, the uniformly heating effect is raised more by the combination thereof with the radiation antenna effect of the heater 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a cooking device such as an oven toaster range that has a heating chamber equipped with a heater.

(Prior Art) A heating cooker such as a microwave oven equipped with a heater in a heating chamber is generally configured as shown in FIGS. 5 and 6. That is, 1 is the cooking device main body, and this main body 1
A heating chamber 2 is provided in the heating chamber 2, and an excitation port 4 is provided in a side wall 3 of the heating chamber 2. The high frequency waves oscillated from the high frequency oscillator 5 are guided to the excitation port 4 through the waveguide 6, and the high frequency waves are introduced into the heating chamber 2 from the excitation port 4. Furthermore, a shelf board 7 on which food to be heated is placed is provided inside the heating chamber 2 so as to be rotated by a motor 8, and an upper heater 9 is provided at the upper and lower parts of the heating chamber 2.
a, a lower heater 9b is provided. Further, the upper heater 9a is provided near the ceiling surface separated from the excitation port 4,
The shelf board 7 is moved by a motor 8 so that the food to be heated is uniformly irradiated with the high frequency waves introduced into the heating chamber 2 through the excitation port 4.
It is designed to cook while rotating.

However, in a toaster oven,
Most of the shelves are fixed, and the food to be heated is not uniformly irradiated with high frequency waves from the excitation port, which tends to cause uneven heating of the food.

(Problems to be Solved by the Invention) As mentioned above, fixed-shelf type heating cookers tend to cause uneven heating of the heated food, so depending on the food, it may be necessary to change the placement of the food during heating. , its operation was troublesome.

This invention was made in view of the above-mentioned circumstances, and its purpose is to uniformly irradiate the food to be heated with high frequency waves from the excitation port provided on the wall of the heating chamber, thereby achieving uniform heating. The purpose is to provide cooking utensils.

(Structure of the invention) (Means and effects for solving the problem) This invention has the following features:
The base of a heater provided in a heating chamber is fixed to a waveguide through an excitation port, and this heater is used as a high-frequency radiation antenna.

(Example) Hereinafter, a practical example of the present invention will be explained based on the drawings, and the same components as those in the conventional art will be given the same numbers and the explanation will be omitted.

Figures 1 and 2 show a first embodiment, with 10
is a shelf board supported by shelf support members 11.11 provided on the side wall of the heating chamber 2, and shows a state in which the food to be heated 12 is placed. Furthermore, the heater 13 provided above the heating v2 has a heat generating part 13a and root parts 13b, 13b (
(non-heat generating part). And the heat generating part 13
a is formed in a square shape and is installed apart from the ceiling surface 14 of the heating chamber 2, and the root portions 13b, 13b penetrate the excitation port 4 and are fixed to the side wall of the waveguide 6. . Furthermore, the distance [A] between the heater 13 and the ceiling surface 14 is set to λ/6 to λ/4 (λ: high frequency wavelength).

The high frequency waves oscillated from the high frequency oscillator 5 are guided to the excitation port 4 via the waveguide 6, and introduced into the heating chamber 2 from the excitation port 4. At this time, the high frequency waves are transmitted in the order of the waveguide 6, the base portions 13b, 13b, and the heat generating portion 13a of the heater 13, and the heater 13 serves as a high frequency radiation antenna, and is radiated into the heating chamber 2 over a wide range. As a result, even if the shelf board 10 is of a fixed type, the food to be heated 12 on the upper surface thereof can be uniformly heated. Moreover, heater 1
Since the distance between the heater 13 and the ceiling surface 14 is λ/6 to λ/4 (λ: high frequency wavelength), the radiation efficiency from the heater 13 is the highest. Uniform heating effect is enhanced.

3 and 4 show another embodiment of the present invention, in which an excitation port 4 is provided in the center of the ceiling surface 14 of the heating chamber 2. FIG. A heater 15 is provided near the ceiling surface 14 to heat and cook the food to be heated 12. This heater 15 consists of a heat generating part 15a and root parts 15b, 15b (non-heat generating parts).
By bending into an S-shape, a straight part 15 is formed in the center.
It forms C. The root portion 1 of this heater 15
5b and 15b pass through the excitation port 4 and are fixed to the earthen wall of the waveguide 6, and the straight portions 15G face each other so as to intersect at approximately right angles at approximately the center in the longitudinal direction of the excitation port 4. .

The distance A between this heater 15 and the ceiling surface 14 is λ
/8 to λ/4 (λ; ^ frequency wavelength), and the external dimension B including the straight portion 15C of the heater 15 is λ.
/2 is set as an integer multiple.

Therefore, the path of the high frequency wave oscillated from the high frequency oscillator 5 is as follows: (a) Waveguide 6 → Excitation Lo 4 → Heating chamber 2 (b) Waveguide 6 → Excitation Lo 4 → Straight section 15G-'IJD heat to 2 (C) Waveguide 6 → Root part 15b → Heat generating part 15a → Heating chamber 2 (d) Waveguide 6 → Root part 15b → Heat generating part 15a → Straight part 15c → Heating chamber 2 etc., intertwined with each other in a wide range. It is radiated into the heating chamber 2.

Therefore, the food to be heated 12 is irradiated more uniformly with high frequency waves than the high frequency waves radiated only from the excitation port 4, and uniform heating can be achieved.

Moreover, the distance A between the heater 13 and the ceiling surface 14 is λ/8~
λ/4 (λ; high frequency wavelength) is the linear portion 15G of the heater 15
This is the value at which the high frequency waves are most easily transmitted, and the high frequency waves directly radiated from the excitation port 4 are not easily obstructed. Further, when the outer dimension B of the linear portion 15c of the heater 15 is an integral multiple of λ/2, the radiation efficiency from the linear portion 15c is the highest value.

〔Effect of the invention〕

As described above, according to the present invention, the root portion of the heater serves to strengthen the high frequency coupling between the waveguide and the heating element, and the high frequency heating efficiency can be improved. Therefore, even with a fixed shelf board, there is an effect that cooking can be done evenly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a heating cooker showing one embodiment of the invention, Fig. 2 is a sectional view taken along line II-II in Fig. 1, and Fig. 3 shows another embodiment of the invention. 4 is a sectional view taken along the line ■-■ in FIG. 3; FIG. 5 is a vertical sectional front view of a typical microwave oven;
It is a sectional view along VVS of a figure. 2...Heating! , 4... Excitation port, 5... High frequency oscillator, 6... Waveguide, 13.15... Heater, 13b
, 15b...root portion, 14...ceiling surface.

Claims (3)

[Claims] (1) In a heating cooker in which an excitation port is provided on the wall surface of a heating chamber, high-frequency waves oscillated from a high-frequency oscillator are guided to the excitation port through a waveguide, and a heater is provided in the heating chamber. A cooking device characterized in that a base portion passes through the excitation port and is fixed to the waveguide. (2) The distance between the heater and the ceiling of the heating chamber is λ/6~
The heating cooker according to claim 1, characterized in that the wavelength is λ/4 (λ: high frequency wavelength). (3) The cooking device according to claim 1, wherein the heater has a straight line portion that intersects at a substantially right angle at a substantially central portion of the excitation port.