JPS6398998A - Microwave oven with heater - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a microwave oven having a heater device in its heating chamber.

Conventional technology Conventional methods for making the high-frequency distribution uniform in microwave ovens include (1) stirring the high-frequency waves with a stirrer, (2) rotating the food on a turntable, and (using a three-rotation antenna to emit high-frequency waves at different positions). (using a four-rotation waveguide to change the radiation position of high-frequency waves, etc.)

Among these, we have presented Japanese Patent Publication No. 56-39040 as an advanced form of the rotating antenna (3). That is, the third
As shown in the figure, there is a heating chamber 2 within the main body 1, and a door 3 that can be opened and closed is provided in the front of the heating chamber. There is a power supply port 4 on the upper wall of the heating chamber 2.
This feed port 4 and magnetron 5 are connected to a waveguide 6.
At the same time, the waveguide 6 and the heating chamber 2 are connected by a coaxial line, and the inner conductor 7 of this coaxial line is constituted by the end of a burnt area heater 8 shown in FIG. This is a method of rotating 8. As a result, all eight parts of the heater function as antennas, and the aim is to obtain a microwave oven with a large stirring effect and good distribution, and also to improve the heating distribution of the browning heater.

Problems that the invention sought to solve However, in such a rotary heater that operates as an antenna, when trying to improve the heat distribution of the heater, the high frequency distribution does not go well, and due to matching problems, the high frequency output is not sufficient. I don't appear in

On the other hand, if the design was based on high-frequency output and distribution, there was a design problem in that the heater's heat distribution could not be properly distributed. In other words, there was a problem in that it was extremely difficult to design both the high frequency and the heater under optimal conditions.

The present invention solves these conventional problems, and provides a microwave oven with a heater that improves the heat distribution of the heater, which is a characteristic of rotary heaters, and also allows for optimal design of high-frequency output and distribution, and has good cooking performance. aimed at providing.

Means for Solving the Problems In order to achieve the above object, the microwave oven with a heater of the present invention has a rotating shaft in the center of the power supply port, and a metal plate is fixed to the heating chamber side of the heater device that rotates inside the heating chamber. However, this metal plate controls the radio waves emitted from the high-frequency oscillator to improve the high-frequency distribution.

Function: In the microwave oven with a heater of the present invention, the heater is a rotary heater, and the heater capacity required for cooking is first determined, and then the shape is determined to provide the best cooking performance.

Next, a metal plate is attached to the top of this heater to obtain the best high frequency output and distribution. Therefore, the shape, length, etc. of the heater can be determined regardless of the high frequency, and on the other hand, the heater shape, length, etc. can be determined independently of the high frequency.

Since the metal plate and the heater are close to each other, if you use a white enamel treatment, the infrared rays will be reflected more, the cooking will be faster, and the food will brown better. Furthermore, if a specially formulated ceramic paint is applied, a large amount of far infrared rays will be emitted, making it possible to efficiently brown food that requires browning.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

The differences in Fig. 1 from the conventional examples shown in Figs. 3 and 4 are as follows:
A metal plate 9 is attached to the heating chamber wall side (upper part) of the rotary heater,
The point is that it controls the radio waves emitted from a high-frequency oscillator. As shown in FIG.
0, thereby eliminating electrical discharge between the heater 8 and the metal plate 9.

The metal plate also has a box-like shape with one wall 9a removed, and the flange 9b is placed close to the wall of the heating chamber 2 for capacitive coupling in terms of radio waves, so that no electricity is output from the power supply port 4. The high frequency waves are mainly supplied into the heating chamber 2 through the wall portion 9a of the metal plate 9 and the through hole 11 of the heater 8 in the metal plate 9. Therefore, by changing the shape of this metal plate 9, the high frequency waves emitted from the power supply port can be freely controlled. This metal plate 9
Since it is fixed to the rotary heater 8, the wall portion 9a of the metal plate 9 rotates and spreads high frequency waves in all directions within the heating chamber 2.

Note that the inner conductor 7 portion, which is the end of the heater and passes through the power supply port 4, can be easily rotated by overturning the pipe after the two sheathed heaters are brought into close contact with each other. This inner conductor 7
The waveguide 6 penetrates through a chiroke 12 to eliminate radio wave leakage and is rotated by a motor 15 via a pulley 13 and a belt 14. In addition, as shown in Fig. 1, this microwave oven with a heater can be used as an oven. A lower heater 16 is attached to the outside of the bottom wall of the heating chamber.

Effects of the Invention As described above, the microwave oven with heater of the present invention provides the following effects.

(1) Compared to the conventional example of Special Publication No. 56-39040,
In the conventional example, the heater shape was constrained by both the heater distribution and the high frequency output/distribution, but in the present invention, the heater shape can be determined only by improving the heater distribution.
A heating cooker with good heat distribution can be provided.

(2) In relation to (1), the high frequency output and distribution can be optimally designed by freely changing the shape of the metal plate, and the radio waves emitted from the power feed port are transmitted in each direction as if they were a rotating waveguide. This makes it possible to provide a cooking device with a good high frequency distribution.

(3) Since a metal plate is attached to the wall of the heating chamber of the heater device, it is the same as providing thermal insulation from drive parts such as pulleys and belts that rotate the heater, and oscillation parts such as magnetrons. The temperature at the top of the oven can be kept low. On the other hand, it is possible to provide a cooking device that allows heat to easily reach the center of the oven and has good thermal efficiency.

The above effects can be doubled if the metal plate is made of stainless steel, or a metal plate treated with white enamel or specially formulated ceramic coating.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a high-frequency heating device according to an embodiment of the present invention, FIG. 2 is a perspective view of the heater and metal plate, and FIG.
The figure is a side sectional view of a conventional example, and FIG. 4 is a perspective view of the same heater. 1...Main body, 2...Heating chamber, 4...
...Power supply port, 5...High frequency oscillator, 6...
...Waveguide, 8...Heater device, 9...
...Metal plate. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
-One body? -Kasei Houki One-Wheel Electric Exit 5- Shima Question Liquid Brother's I B-Leading Shakutube ε-Hee Y Tatsuwaki Figure 1 9-→J7 Saka Figure 2 Figure 3

Claims (4)

[Claims] (1) A heating chamber in the main body, a power supply port formed in the heating chamber, a waveguide connecting the power supply port and the high-frequency oscillator, and a rotating shaft in the center of the power supply port; A microwave oven with a heater, comprising: a rotating heater device; and a metal plate fixed to the heater device on a heating chamber wall side of the heater device, the metal plate controlling radio waves emitted from a high-frequency oscillator. (2) The main peripheral portion of the metal plate is brought close to the heating chamber wall for capacitive coupling, and the high frequency waves emitted from the power supply port are radiated from a part of the metal plate to the heating chamber. Microwave oven with heater. (3) A microwave oven with a heater according to claim 1, wherein the metal plate is made of a material with good heat reflection, such as a stainless steel material or a metal plate treated with white enamel. (4) A microwave oven with a heater according to claim 1, characterized in that a ceramic paint that emits infrared rays is baked on a metal plate.