JP2538583B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) [0001] The present invention relates to a cooker for heating and cooking by the heat and high frequency of a heater.

(Prior Art) Conventionally, in a microwave oven (cooker), as shown in FIG. 6, in a heating structure using heater heat, the heater 2 is installed close to the inner wall surfaces of the upper and lower portions of the heating chamber 1. Is being done. Further, in the heating structure using high frequency, the waveguide 3 is fixed to the upper wall 1a of the heating chamber 1 and connected to the excitation port 4 provided on the upper wall, and at the end of the remaining waveguide 3. The structure of installing the magnetron 5 is used to heat the food 7 placed on the shelf 6 in the heating chamber 1 by the heat of the heaters 2 and 2, and also on the shelf 6 by the microwave (high frequency) oscillated from the magnetron 5. The food 7 is heated. In FIG. 6, 8 is a cabinet, 9 is a machine room adjacent to the heating chamber 1, 10 is a high voltage transformer installed in the machine room 9 for applying a high voltage to the magnetron 5, 11 Is a cover of the excitation port 4 (made of mica), and 12 is a shelf support formed on the left and right walls of the heating chamber 1.

By the way, such a microwave oven has a problem in terms of cooking performance.

(Problems to be Solved by the Invention) That is, in heating with the heater heat, the radiant heat from the heater 2 is directly absorbed by the food 7, or the radiant heat is reflected to the upper wall of the heating chamber 1 and the like, and thereafter, This is done by being absorbed by the food 7, but since the upper wall 1a that reflects heat is a flat plate as shown in FIG. 7, the radiant heat is diffused, and the food 7 is unevenly baked. Food 7 was not efficiently heated, and it took a long time to cook.

Further, heating at a high frequency is performed by the microwave from the magnetron 5 entering the heating chamber 1 through the excitation port 4, but a small excitation port is avoided in order to avoid the cost increase due to the size increase of the waveguide 3. Since 4 is used, the electric field strength in the heating chamber 1 is disturbed, the food 6 cannot be heated uniformly, and temperature unevenness occurs inside the food.

The present invention has been made by paying attention to such problems, and an object thereof is to favorably perform both heating using a heater and high-frequency cooking without making the waveguide large. The purpose is to provide a cooking device that can.

[Structure of the Invention] (Means and Actions for Solving Problems) In the present invention, the heater 2 is located at the center of the inner wall surface of the heating chamber 1 that faces the linear rod-shaped heater 2 closely. A groove 20 having a substantially arcuate cross section is formed, and the groove 20
By connecting the waveguide 3 for guiding the high frequency wave oscillated from the magnetron to the inside of the groove 20 at the end portion in the longitudinal direction of the structure, the high frequency wave is introduced into the heating chamber 1 through the inside of the groove part 20.
The radiant heat of the heater 2 is uniformly reflected in the direction in which the food 7 is present by the arc-shaped surface, and the high frequency is guided to the inner side of the heating chamber 1 by the groove 20 to make the electric field strength uniform.

(Embodiment) The present invention will be described below based on an embodiment shown in FIGS. 1 to 3. However, in FIGS. 1 to 3, the same parts as those described in the above-mentioned “Prior Art” are designated by the same reference numerals and the description thereof will be omitted. Will be explained.

That is, in one embodiment, the upper linear heater 2 is provided.
Is different in that the upper wall surface portion which is close to and opposed to is the excitation port 4.

Specifically, in the heating chamber 1, a mounting seat 5a for mounting the magnetron 5 is formed on the upper end portion of the right side wall, and the upper wall
A structure is used in which the upper surface of the mounting seat 5a is covered with 1a. Then, as shown in FIG. 3, the upper wall portion of the upper wall 1a, which is in close proximity to the heater 2, is bent along the heater 2 and has a semi-cylindrical (substantially arcuate) cross section with the heater 2 at the center. A groove 20 is formed on the upper wall 1a along the straight shape of the heater 2. The arc-shaped surface of the groove 20 is configured to reflect the radiant heat from the upper heater 2 in the vertical direction with directivity. That is,
The radiant heat is directed to the food 7 side.

Further, such bending of the upper wall 1a is extended to the plate surface portion on the mounting seat 5a as shown in FIG. 2, and the waveguide 3 which is integrally connected to one end of the groove portion 20 in the longitudinal direction. Is formed. A cover 11 made of mica is interposed in the middle of the waveguide 3 so that the microwave (high frequency) oscillated from the magnetron 5 is guided to the groove 20 through the waveguide 3. That is, the groove part extending to the left and right sides of the heating chamber 1.
The structure is such that 20 openings are used as the excitation ports 4 and microwaves can be guided into the refrigerator.

In FIG. 2, 23 is a high-voltage condenser used for applying a high voltage to the magnetron 5, and 24 is a cooling fan for cooling electric parts (both are arranged in the machine room 9).

Next, the operation of the microwave oven thus configured will be described.

For example, when cooking with the heater 2 on the upper side, after housing the shelf 6 on which the food 7 is placed in the heating chamber 1,
Perform necessary operations on the operation unit (not shown).

As a result, the heater 2 on the upper side is energized, and the heater 2 on the upper side gradually generates heat. Then, the radiant heat from the heater 2 is uniformly reflected in the vertical direction, that is, the food direction without being diffused on the arc-shaped surface of the groove portion 20 as shown in FIG. The food 7 is absorbed by the radiant heat.

However, the radiant heat is uniformly and effectively absorbed in the food 7 and the uneven baking can be reduced. Moreover, since the heating is efficiently performed, the cooking time can be shortened.

In addition, when heating using microwaves, an operation for starting range cooking is performed this time. This allows
A high voltage is applied to the magnetron 5, microwave (high frequency) is oscillated from the antenna portion 5b of the magnetron 5, and is guided into the groove portion 20 through the waveguide 3. And
This microwave is guided to the inner side of the heating chamber 1 in the groove 20 (on the right side away from the magnetron 5), and the microwave is radiated from the entire groove 20 in the left-right direction of the heating chamber 1. As a result, the electric field strength on the left and right sides of the heating chamber 1 is made uniform. This means that the microwave is evenly absorbed by the food 7.

However, the food 7 can be heated and cooked uniformly,
The temperature unevenness inside the food can be reduced.

Therefore, the groove 20 makes it possible to enhance cooking performance at the same time for both heating and cooking using heater heat and high frequency. Moreover, the waveguide 3 is made large and the cover 4 is used.
Since it does not need to be made large, it is cheap in terms of cost.

Although the groove 20 having a semi-cylindrical cross section is formed on the upper wall surface in one embodiment, even the groove 20 having a complete arcuate cross section as shown in FIG. 4 has a polygonal shape shown in FIG. The circular groove portion 20 or the like may be used. Of course, the arc shape of the cross section including one embodiment is selected by matching the heater cooking and the high frequency cooking. For example, it can be said that the perfect arc shape shown in FIG. 4 is excellent in improving unevenness in baking particularly when cooking with a heater (while the waveguide 3 becomes small), but the performance slightly changes depending on the shape.

Further, in the embodiment, the waveguide 3 integrated with the groove 20 is used, but the waveguide 3 which is a separate component as in the related art may be used.

As described above, according to the present invention, the radiant heat of the heater is uniformly reflected in the direction of the food by the arcuate surface of the groove,
Further, the high frequency can be guided to the inner side of the heating chamber by the groove portion to make the electric field strength uniform.

Therefore, it is possible to reduce uneven baking and uneven temperature of the food. Moreover, since the radiant heat of the heater and the high frequency can be effectively absorbed by the food, both can perform efficient cooking. Moreover, since the waveguide is not made large, the cost is low.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
The figure is a front cross-sectional view showing the groove around the main part together with the schematic configuration of the cooker, and FIG. 2 is a cross-sectional view taken along line A-A in FIG.
FIG. 3 is a perspective view showing a groove portion having a substantially arcuate cross section, FIG. 4 is a perspective view showing a groove portion of an essential part of another embodiment of the present invention, and FIG. 5 is a perspective view showing a different groove portion thereof. FIG. 7 is a front sectional view showing a conventional heater and a cooking device that cooks using a high frequency, and FIG. 7 is a perspective view showing the reflection of radiant heat from the heater. 1 ... Heating chamber, 2 ... Heater, 3 ... Waveguide, 7 ... Food, 20 ... Groove part.

Claims (2)

(57) [Claims] 1. A heating chamber in which a linear rod-shaped heater is provided in proximity to an inner wall surface, a magnetron for generating high frequency, and a heater formed on an inner wall surface portion of the heating chamber facing the heater along the heater. A cooking device comprising: a groove portion having a substantially arcuate cross section having a center as a center; and a waveguide connected to an end portion in the longitudinal direction of the groove portion and guiding a high frequency wave oscillated from the magnetron into the groove portion. 2. The cooker according to claim 1, wherein the arcuate groove is formed along substantially the entire heater.