JPS63156931A - Cooking apparatus - Google Patents

Abstract

PURPOSE:To uniformly heat and cook a food-stuff by allowing a heater to have a shape having a straight line part intercrossing rectangularly at the central part of an exciting port so that microwaves from the exciting port are interwined mutually in a complicated manner and radiated in a wide range into a heating chamber. CONSTITUTION:Microwaves transmitted from a microwave transmitter 5 is guided to an exciting port 4 through a waveguide 6, and is introduced into a heating chamber 2 through an exciting port 4. The microwaves are radiated into a heating chamber 2 directly through an exciting port 4 and in a wide range in a complicate manner of mutual interwinding from the exciting port 4 to the straight line part 14 of the heater 13, from the exciting port 4 to the straight line part 14 and both ends of the heater 13. Accordingly, the microwaves can be irradiated onto a food-stuff 12 to be heated more uniformly than those being irradiated only from the exciting port 12, and therefore the food-stuff 12 can be heated further uniformly. That is, the microwaves from the exciting port 4 are disturbed by the straight line part 14 of the heater 13 positioned at the central part of the exciting port 4.

Description

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

(Prior Art) A heating cooking device 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 the ceiling surface 3 of the heating chamber 2. Then, the high 5th frequency wave oscillated from the high frequency oscillator 5 is passed through the waveguide 6 to the excitation port 4.
The high frequency waves are introduced into the heating chamber 2 through the excitation port 4. Furthermore, a shelf board 7 for placing food to be heated is provided inside the heating chamber 2 so as to be rotated by a motor 8, and upper heaters 9a, 9b are provided at the upper and lower parts of the heating chamber 2. It is provided. Further, the upper heater 9a is formed in a rectangular shape so as to avoid the excitation port 4, and the shelf plate is arranged so that the high frequency wave introduced from the excitation port 4 into the heating chamber 2 is uniformly irradiated onto the food to be heated. 7 is rotated by a motor 8 for cooking.

However, in a toaster oven,
Many of them have fixed shelf boards, which has the disadvantage that the high frequency waves from the excitation port cannot uniformly irradiate the food to be heated, which tends to cause unevenness in 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 very troublesome.

This invention was made with attention to 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 ceiling of the heating chamber, thereby achieving uniform heating. The purpose is to provide a heating cooker.

[Structure of the Invention] (Means and Effects for Solving the Problems) This invention provides a heater provided in a heating chamber with a shape having a straight line portion that intersects at a right angle approximately in the center of the excitation port. The high-frequency radiation antenna is used, and the high-frequency waves radiated from the excitation port are intricately intertwined and radiated into the heating chamber over a wide range.

(Embodiments) Hereinafter, each embodiment of the present invention will be described based on the drawings, and the same components as those in the prior 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. A rectangular excitation port 4 is provided approximately at the center of the ceiling surface 3 of the heating chamber 2, and a heater 13 is provided on the ceiling surface 3 facing the excitation port 4. This heater 13 is bent in an S-shape to form a straight portion 14 in the middle portion. The straight portions 14 are provided at approximately the central portion in the longitudinal direction of the excitation port 4 and are opposed to each other so as to intersect at approximately right angles.
(non-heat generating part) is bent upward at right angles and fixed to the ceiling surface 3.

Therefore, the heater 13 exists at a distance A from the ceiling surface 3, and this distance A is λ/8 to λ/4 (λ: high frequency wavelength).
is set to . Furthermore, the linear portion 14 of the heater 13
The external dimension B including the λ/2 is set to an integral multiple of λ/2.

Next, the operation of the above embodiment will be explained.

The high frequency waves oscillated from the high frequency oscillator 5 are guided through the waveguide 6 to the excitation port 4 and introduced into the heating chamber 2 from the excitation port 4 . The high frequency waves are transmitted directly from the excitation port 4, from the excitation port 4 to the linear portion 14 of the heater 13, and from the excitation port 4 to the linear portion 14 and both ends 13a s 13a of the heater 13, etc., and are intricately intertwined to spread over a wide range of heating chambers. 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. That is, the high frequency waves from the excitation port 4 are disturbed by the linear portion 14 of the heater 13 located at the center of the excitation port 4. Furthermore, the distance A between the heater 13 and the ceiling surface 3 is set to λ/8~
By setting it to λ/4, the high frequency from the excitation port 4 is the most likely to be transmitted to the straight portion 14, and direct irradiation from the excitation port 4 is prevented. In addition, by setting the external dimension B of the heater 13 to an integral multiple of λ/2, the linear portion 14
and the value at which the radiation efficiency from the vicinity is likely to be highest. Furthermore, by fixing the heater root portion 15.15 to the ceiling surface 2, the entire heater 13 forms a loop antenna near the excitation port 4, further improving radiation efficiency. Further, by attaching the heater root portion 15.15 to the ceiling surface 3, there is an effect in this embodiment that dead space can be used effectively.

3 and 4 show a second embodiment, in which the distance A from the ceiling surface 3 to the heater 13 is set to λ in the same way as in the first embodiment.
/8 to λ/4, and at the base of the heater 15.
15 is bent in the horizontal direction and fixed to both side walls of the heating chamber 2, and the distance C between the heater root portion 15.15 and the ceiling surface 3 is approximately λ/10 or less, so that the linear portion 14 of the heater A step is provided at the root portion 15, -1 and 5.

Therefore, the high frequency is transmitted directly from the excitation port 4, from the excitation port 4 to the straight portion 14 of the heater 13, and from the excitation port 4 to the straight portion 14 of the heater 13.
It is intricately intertwined with the heater 13 via the radiator and radiates into the heating chamber 2 over a wide range. As a result, the food to be cooked can be heated and cooked uniformly in the same way as in the first embodiment. [Effects of the Invention] As explained above, according to the present invention, the high frequency waves from the excitation port are complicatedly heated by the heater. They intertwine and radiate over a wide area, even if the shelves on which the food to be cooked is placed are fixed.
It has the effect of uniformly heating and cooking and improving high frequency radiation efficiency.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a heating cooker showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along line a-a in FIG. 1, and FIG. FIG. 4 is a sectional view taken along line b-b in FIG. 3, FIG. 5 is a longitudinal sectional front view of a general microwave oven, and FIG.
FIG. 2... Heating chamber, 3... Ceiling surface, 4... Excitation port, 1
3... Heater, 14... Straight line part, 15... Heater root part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) In a cooking device having an excitation port on the ceiling surface of the heating chamber for introducing high frequency waves oscillated from a high frequency oscillator into the heating chamber, and having a heater in the heating chamber, the heater is provided with an excitation port approximately equal to the excitation port. A heating cooker characterized by having a straight line section that intersects at almost right angles in the center. (2) The distance between the linear portion and the ceiling surface is set to λ/8 to λ/4 (λ: high frequency wavelength), and the outer dimensions of the heater including the linear portion are approximately an integral multiple of λ/2. A heating cooker according to claim 1, characterized in that: