JPH01313883A - Heating cooking device - Google Patents

Abstract

PURPOSE:To ensure the compact design of a cooking device and the uniform heating of a cooked food, and improve cooking efficiency by shortening a distance between elements constituting a heating part via the projection of a wave guide sideward from the side wall of a cooking chamber. CONSTITUTION:A wave guide 9 for introducing a microwave to the inside of a cooking chamber 3 is projected approximately to the center outside of the side wall of the cooking chamber 3 and a magnetron 8 is placed and fixed to the upper surface of the projection end of the wave guide 9. Furthermore, a transformer 7 is installed near a space under the wave guide 9 at the predetermined distance, and a fan 10 is so constituted and located sideward as to be capable of cooling the wave guide 9 and magnetron 8 and the transformer 7. According to the aforesaid construction, the length of the wave guide 9 can be kept at actual length equivalent to a minimum distance between a heating part and the cooking chamber 3. Also, only a space for housing the heating part is enough for occupation by the wave guide 9. Consequently, a small type wave guide is useful enough and the irregular heating of a cooked food can be eliminated. Also, cooling efficiency for the heating part can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cooking device that cooks food using high-frequency heat radiation from a heater disposed in a cooking chamber.

[Prior Art] Microwave ovens that cook food using the principle of irradiating high-frequency power to a dielectric material such as water or oil are widely used.

According to this principle, there are various advantages such as shortening of heating time and uniform heating, which improves the quality of thawing and cooking of frozen foods, and is becoming an indispensable cooking tool for modern diets.

Heating in a microwave oven involves doubling and rectifying the voltage of several Mllz generated on the secondary side of a high-voltage transformer using a diode and a high-voltage capacitor, and applying this to the anode of a magnetron, causing it to oscillate. This is done by

FIG. 2 shows an external perspective view of a general microwave oven. A box-shaped case (1) has a cooking chamber (3) in which a rotatable food tray (2) is installed, and the user can open the door (
By opening and closing 4), the food to be cooked is stored in and taken out from the cooking chamber (3).

An operating section (6) including a timer (6b) and a start switch (6a) for setting heating time and heating power is provided on the side of the cooking chamber (3) on the front side of the case (1).

The heating section and cooling fan, which mainly consist of a high-voltage transformer, a high-voltage condenser, and a magnetron, are used to generate the aforementioned high-frequency heat rays and to irradiate the food in the cooking chamber (3) between the case (1) and the cooking chamber (3). It is stored and arranged in the space formed between.

FIG. 2(B) shows the arrangement of internal elements of the microwave oven according to FIG. 2(A). The heating part that generates high-frequency heat rays that serve as a cooking medium for the food in the cooking chamber (3) is the case (1).
A high voltage transformer (7) that generates a high voltage of several MHz is located below the cooking chamber (3). A magnetron (8) that generates high frequency heat rays based on high voltage from a high voltage transformer (7) is connected to a waveguide (8) that protrudes from the ceiling of the cooking chamber (3) into the space where the heating section is installed.
The high voltage transformer (7) is located below the high voltage transformer (7). In addition, a diode for rectifying the high voltage from the high-voltage transformer, a high-voltage capacitor, and other various elements are arranged at predetermined locations, but their explanations are omitted here for the sake of brevity.

Since extremely high voltage and frequency are generated from the transformer (7) and magnetron (8),
It also overheats noticeably faster. For this reason, a fan (10) is provided on the side of the high voltage transformer (7) and magnetron (8) located on the -vertical line for the purpose of cooling the pixel element.

The fan (10) is driven to rotate at the same time as the start switch (6a) is turned on and high-frequency heat rays are generated from the heating section to send cooling air to the heating section, thereby preventing the element from being destroyed by overheating.

[Problems to be Solved by the Invention] However, in the configuration of the conventional microwave oven described above, the waveguide (9) that guides the high frequency heat rays generated in the magnetron (8) into the cooking chamber (3) is connected to the cooking chamber (3). Since the waveguide (9) is configured to pass through the information and open from the ceiling, this waveguide (9) is a major cause of increasing the size of the device configuration, especially in the vertical direction.

Furthermore, since the high-frequency heat rays are irradiated from the ceiling of the cooking chamber (3), the heating power of the high-frequency heat rays decreases as it goes downwards in the cooking chamber (3).

As a result, food placed in the cooking chamber (3) tends to be heated unevenly above and below it, and especially when heating a pot containing a drink, a temperature difference occurs between the top and bottom of the liquid in the pot. There were some inconveniences, such as getting stuck.

Furthermore, in the conventional configuration, the high-voltage transformer (7) is placed below the case (1), and the magnetron (8) is placed hanging from the waveguide led out from the ceiling of the cooking chamber (3). This increases the distance between these pixel elements. For this reason, even if a cooling fan is placed on the side of the pixel element to cool it at the same time, there is a problem that the air escapes by the time it reaches the pixel element, resulting in poor cooling efficiency. there were.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to eliminate uneven heating of the food to be cooked, by using a small waveguide, and to improve the cooling efficiency of the heating section. The purpose of the present invention is to provide a heating cooker that can heat the food.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a waveguide that guides microwaves generated from a magnetron into the cooking chamber and protrudes outward from a substantially central portion of the side wall of the cooking chamber. The magnetron is mounted and fixed on the upper surface of the protruding end of the waveguide, the transformer is installed at a predetermined distance near the bottom of the waveguide, and the fan connects the waveguide, the magnetron, and the transformer. It is characterized by being arranged at a side position where it can be cooled at the same time.

[Function] According to the present invention configured as described above, the length of the waveguide is only the actual length corresponding to the shortest distance between the heating section and the cooking chamber, and the space occupied by this waveguide is Since the system only utilizes the space created to accommodate the heating section, there is no need to expand the device above the cooking chamber by the diameter of the waveguide, as in the case of conventional methods, and the existing space can be saved. It becomes possible to make the device more compact by making effective use of it. By protruding the waveguide from the side of the cooking chamber, the mutual distance between the high-voltage transformer, waveguide, and magnetron that are to be cooled is greatly shortened, which reduces the amount of cooling air escaping from the fan. cooling efficiency can be greatly improved.

Furthermore, since the microwave is irradiated from the side, there is an advantage that uneven heating is reduced when using a tall cooking container.

[Example] Hereinafter, a preferred example of the present invention will be described based on FIG. 1. Incidentally, in the drawings, the same reference numerals are given to the same components as those of the conventional device, and the explanation thereof will be omitted.

What is distinctive about the present invention is the idea that the microwave irradiation method is directed from the side of the cooking chamber, contrary to the conventional common sense of directing downward from the ceiling of the cooking chamber.

That is, as shown in the figure, the waveguide (9
) is formed to protrude from the side of the cooking chamber (3) into the space where the heating section is installed, and below the waveguide (9) is a high voltage transformer (7) and the waveguide (9). ) A magnetron (8) is placed and fixed on the upper surface of the projecting side end.

In this way, the heating parts that generate microwaves and guide them into the cooking chamber are centrally installed close to each other, and the cooling fan is located on the side thereof.

As a result, first of all, regarding the waveguide (9), as shown in FIG.
) As is clear from the comparison with the conventional device, its length has been significantly shortened, and the space occupied by this waveguide (9) utilizes a part of the heating unit storage space, which was the existing space in the conventional device. This allows the conventional cooking room (3
) The height of the device is reduced by the height corresponding to the diameter of the waveguide (9) that was protruding upward from the waveguide (9), and a compact configuration becomes possible without reducing manufacturing costs or degrading performance in any way.

Also, with this configuration, the microwaves generated in the magnetron (8) pass through the waveguide (9) and reach the cooking chamber (3).
) A heating effect is exerted on the food inside from the side,
As a result, there is no uneven heating of the food, especially when a tall top is set, there is no temperature difference between the top and bottom of the internal liquid of the top. There may be concerns that heating from the sides will cause uneven heating on the sides of the food, but this is due to heating from the sides (3).
Uniform heating can be easily achieved by a structure in which the internal food tray is rotated by a motor at the same time as cooking starts.

Furthermore, in the illustrated example, the waveguide (9) is connected to the cooking chamber (3).
A magnetron (8) is mounted and fixed on the waveguide (9), and the high-voltage transformer (7) to be cooled, these magnetrons (8), and the waveguide are formed protruding from the side. The distance to the pipe (9) becomes much closer. Therefore, the cooling air sent from the fan (10) reaches each of the heating elements which are close to each other very effectively without escaping much on the way, making it possible to significantly improve the cooling efficiency.

At this time, it can be understood that in the configuration of the illustrated example, the space between the magnetron (8), the waveguide (9), and the high voltage transformer (7) is small, and a narrow groove-like passage is formed.

Therefore, the air from the fan (10) can be reliably sent along this path toward the left in the figure to the end of the waveguide (9) without escaping, which was difficult with conventional devices. Uniform cooling of the tube (9) can also be achieved.

[Effects of the Invention] As explained above, according to the present invention, the waveguide is provided protruding from the side wall of the cooking chamber to shorten the distance between the elements constituting the heating section. It is possible to achieve the effects of reducing the size of the food and improving the uniform heating and cooling efficiency of the food to be cooked.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of the present invention, FIG. 2(A) is an external perspective view of a conventional device, and FIG. 2(B) is a schematic diagram showing the internal structure of the conventional device. In the figure, (1) is the case, (3) is the cooking chamber, and (7) is the case.
is a high voltage transformer, (8) is a magnetron, (9) is a waveguide, and (10) is a fan. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent: Patent attorney: Masuo Oiwa (2 others) Figure 1 of the X-circle showing the structure of the present invention

Claims (1)

[Claims] A transformer that generates high voltage, a magnetron that oscillates and outputs the high voltage from the transformer as microwaves, and a conductor that guides the microwaves from the magnetron into a cooking chamber in which food is placed. In a heating cooker including a waveguide and a fan for cooling each of the elements, the waveguide is provided protruding outward from a substantially central portion of a side wall of the cooking chamber, and the upper surface of the protruding end of the waveguide is provided. the magnetron is placed and fixed on the base, the transformer is installed near the bottom of the waveguide at a predetermined distance apart, and the fan is disposed at a side position where it can simultaneously cool the waveguide, the magnetron, and the transformer. A heating cooker characterized by: