JPS63220019A - Cooking utensil - Google Patents

Abstract

PURPOSE:To perform with good result both heated cooking using a heater and heated cooking using high frequency waves without making the size of a waveguide large by reflecting the radiation heat of a heater by the circular face of a groove section of the heater uniformly towards a food and guiding the high frequency waves deep into a heating chamber by means of the groove section in order to make the strength of the electric field uniform. CONSTITUTION:In a heating room 1 a bending work for forming a half-cylindrical cross section with a heater 2 in the center is applied to the upper wall section which is near and opposing to the heater 2 on the upper wall 1a so that a groove section 20 which runs along the straight shape of the heater 2 is formed. By the circular face of this groove section 20 the radiation heat from a heater 2 on the upper side is reflected with directivity in the vertical direction. The bending work of the upper wall 1a is extended to the flat face section on a mounting seat 5a to form a waveguide 3 which is connected as one body to the groove section 20. And, on the intermediate section of the waveguide 3 a cover 11 made of mica is mounted, and it guides the microwaves emitted from a magnetron 5 to the groove section through the waveguide 3. With this arrangement the radiation heat of the heater and the high-frequency waves are absorbed by foods and efficient cooking can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cooking device that performs cooking using heat from a heater and high frequency waves.

(Prior art) Conventionally, in an open range (U4 oven), the heating structure using heater heat, as shown in FIG. It is being attached. In addition, in a heating structure using high frequency, a waveguide 3 is fixed to the upper wall 1a of the heating chamber 1 and connected to an excitation port 4 provided on the upper wall. A structure in which a magnetron 5 is installed is used, and the heat from the heaters 2 and 2 is used to heat the food 7 placed on the shelf 6 in the heating chamber 1, and the microwave (high frequency) oscillated from the magnetron 5 is used to heat the food 7 placed on the shelf 6. The food 7 is heated. In addition, in FIG. 6, 8 is a cabinet, and 9 is a machine configured in a part adjacent to the heating chamber 1! , 10 is a high-voltage transformer installed in the machine 9 to apply high voltage to the magnetron 5, 11 is a cover for 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. It is.

However, these microwave ovens have problems in terms of cooking performance.

(Problems to be Solved by the Invention) In other words, when heating with heater heat, the radiant heat from the heater 2 is directly absorbed by the food 7, or the radiant heat is reflected on the upper wall of the heating chamber 1, etc., and then, This is done by being absorbed by the food 7, but as shown in FIG. 7, since the upper wall 1a that reflects heat is a flat plate, the radiant heat is diffused, causing uneven cooking on the food 7. Food 7 was not heated efficiently and took a long time to cook.

Heating with high frequency is performed by the microwaves from the magnetron 5 entering the heating chamber 1 through the excitation port 4. However, in order to avoid the high cost of increasing the size of the waveguide 3, a small excitation port is used. 4, the electric field strength within the heating chamber 1 is disturbed, making it impossible to uniformly heat the food 6 and causing temperature unevenness inside the food.

This invention was made with attention to these problems, and its purpose is to successfully perform both heating and cooking using a heater and high frequency without increasing the size of the waveguide. Our goal is to provide cooking devices that can.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a groove portion 20 having a substantially arcuate cross section with the heater 2 in the center on the inner wall surface portion of the heating chamber 1 that closely faces the heater 2. The arc-shaped surface of the groove 20 uniformly reflects the radiant heat of the heater 2 in the direction of the food 7, and the groove 20 guides the high frequency into the heating chamber 1. is guided to the back of the heating chamber 1 to make the electric field strength uniform.

(Example) The present invention will be described below based on an example shown in FIGS. 1 to 3. However, in Figures 1 to 3, the same parts as those described in the previous section of "Prior Art" are given the same reference numerals and their explanations are omitted, and this section only describes the main parts that are different. I will explain about this.

That is, one embodiment is different in that the upper wall surface portion that closely faces the heater 2 on the upper side is used as the excitation port 4.

Specifically, the heating chamber 1 has a structure in which a mounting seat 5a on which the magnetron 5 is installed is formed at the upper end of the right side wall, and the upper wall 1a covers the upper surface of the mounting seat 5a. Then, as shown in FIG. 3, the upper wall surface portion of the upper wall 1a that closely faces the heater 2 is bent to have a semicircular cross section (approximately circular arc shape) with the heater 2 in the center. A groove portion 20 is formed along the straight shape of the heater 2. The arc-shaped surface of the groove portion 20 allows the radiant heat from the heater 2 on the upper side to be reflected in a vertical direction with directivity. In other words, food 7
Radiant heat is directed to the side.

Furthermore, the bending process of the upper wall 1a is extended to the plate surface above the mounting seat 5a, as shown in FIG.
A waveguide 3 integrally connected to the groove portion 20 is formed. A cover 11 made of mica is interposed in the middle of the waveguide 3 to guide the microwave (high frequency) oscillated from the magnetron 5 to the groove 20 through the waveguide 3. In other words, the structure is such that the openings of the grooves 2o spanning the left and right sides of the heating chamber 1 can be used as the excitation ports 4 to guide microwaves into the refrigerator.

In FIG. 2, 23 is a high-voltage capacitor used to apply a high voltage to the magnetron 5, and 24 is a cooling fan for cooling electrical components (both are disposed inside the machine 9).

Next, the operation of the microwave oven configured as described above will be explained.

For example, when cooking is performed using the heater 2 on the upper side, the shelf 6 on which the food 7 is placed is placed in the heating chamber 1, and then the necessary operations are performed using an operation section (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. And heater 2
As shown in FIG. 3, the radiant heat from the groove 20 is reflected uniformly in the vertical direction, that is, in the direction of the food, without being diffused, by the arcuate surface of the groove 20, and the radiant heat directly goes toward the food 7, as well as the food 7. It will be absorbed into.

However, the radiant heat is evenly and effectively absorbed into the food 7, and uneven cooking can be reduced. Moreover,
Since heating is performed efficiently, cooking time can be shortened.

Also, when cooking using microwaves, an operation is performed to start microwave cooking. As a result, a high voltage is applied to the magnetron 5, and microwaves (high frequency waves) are oscillated from the antenna portion 5b of the magnetron 5 and guided into the groove portion 2o through the waveguide 3. Then, this microwave is guided to the back side of the heating chamber 1 (the right side away from the magnetron 5) through the groove 20, and
Microwaves are irradiated from the entire heating chamber 1 in the left and right direction. This makes the electric field strength on the left and right sides of the heating chamber 1 uniform. This means that the microwave is uniformly absorbed into the food 7.

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

Therefore, the groove portion 20 makes it possible to simultaneously improve cooking performance in both heating cooking using heater heat and high frequency. Moreover, the waveguide 3 can be made large, the cover 4 can be
There is no need to make it large, so it is inexpensive in terms of cost.

In one embodiment, the groove 20 having a semi-cylindrical cross section is formed on the upper wall surface, but even if the groove 20 has a completely arcuate cross section as shown in FIG. The groove portion 20 may be formed into an arc shape. Of course, the arc shape of the cross section, including one example, is selected by matching heater cooking and high frequency cooking. For example, the performance changes slightly depending on the shape (for example, the complete shape shown in FIG. 4).

Further, in one embodiment, the waveguide 3 that is integrated with the groove portion 20 is used, but it is also possible to use a waveguide 3 that is a separate component.

[Effects of the Invention] As explained above, according to the present invention, the arcuate surface of the groove uniformly reflects overnight radiant heat toward the food, and the groove also reflects high frequency waves toward the back of the heating chamber. can be used to make the electric field strength uniform.

Therefore, uneven cooking and temperature unevenness of food can be reduced. In addition, since the radiant heat and high frequency waves of the heater can be effectively absorbed into the food, efficient heating and cooking can be performed using both.

Moreover, since the waveguide does not have to be made large, the cost can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a front sectional view showing the main part of the groove part along with the general structure of the cooking device, and FIG. 2 is a sectional view taken along line A-A in FIG. 1.
FIG. 3 is a perspective view showing a groove portion having a substantially arcuate cross section, FIG. 4 is a perspective view showing a main groove portion of another embodiment of the present invention, FIG. 5 is a perspective view showing a different groove portion, and FIG. The figure is a front sectional view showing a conventional heater and a cooking device that uses high frequency.
The figure is a perspective view showing reflection of radiant heat from the heater. 1... Heating chamber, 2... Heater, 3... Waveguide, 7
...Food, 20...Mizobe. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4 Figure 5 Figure 7rl! J

Claims (2)

[Claims] (1) A heating chamber in which a heater is provided close to the inner wall surface;
a magnetron that oscillates high frequency waves, a groove portion formed on the inner wall surface of the heating chamber facing the heater and having a substantially arc-shaped cross section with the heater as the center; A cooking device characterized by comprising a waveguide that guides the inside. (2) The cooking device according to claim 1, wherein the arcuate groove portion is formed along substantially the entire heater.