JPS6117285Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device having a thawing chamber in which a part of the microwaves in the high-frequency heating chamber can be introduced into the chamber and a refrigerant flow path is provided on the outer surface of the chamber wall.

Frozen foods have traditionally been thawed in a microwave oven, but since magnetron cooling air is added to the oven, the temperature inside the oven is not ideal for thawing frozen foods. The temperature becomes considerably higher than ±0 to 2°C (specifically, 30 to 60°C).

This high temperature inside the oven makes it impossible to thaw frozen foods while maintaining their quality, and if a low temperature atmosphere (around 0℃) suitable for thawing frozen foods could be obtained, it would not be possible to maintain the temperature. The actual situation is that the freshness of frozen foods decreases, and as a result, the ability to defrost them in the oven is inferior to other foods.

The present invention was devised in view of the poor defrosting performance in a high-frequency heating chamber (oven) as described above.

The purpose of this invention is to create a thawing chamber that can create the most desirable low-temperature atmosphere for the thawing object by heating the thawing object by a portion of the microwave power applied to the high-frequency heating chamber and cooling the object by a refrigerant. An object of the present invention is to provide a high frequency heating device having a high frequency heating device.

The purpose of this is to provide a slit in a part of the wall of the high-frequency heating chamber, and from this slit, the microwave power inside the high-frequency heating chamber leaks into the thawing chamber through a low dielectric loss insulation material. While attempting to utilize a portion of the electricity, a refrigerant flow path is installed on the outer wall of the thawing chamber to balance the cooling capacity with the heating ability of the above-mentioned partial use of microwave power, thereby covering the atmosphere inside the thawing chamber. This is achieved by maintaining a low atmosphere, which is most desirable for thawing.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a high frequency heating device 1 of the present invention. 2
is a door for the high-frequency heating chamber 3 (see FIG. 2) of the high-frequency heating device 1. A thawing chamber 4 and a freezer chamber 5, which are not visible in FIG. 1, are located below the high-frequency heating chamber 3. The door of the thawing chamber 4 is indicated by 6, and the door of the freezer chamber 5 is indicated by 7. Although not shown, the high-frequency heating chamber 3 is provided with a microwave excitation port and a starvation fan for stirring the microwaves from the excitation port. The excitation port is connected to the magnetron via a waveguide.

As shown in Fig. 2, a high frequency heating chamber 3 and a thawing chamber 4
A slit is formed between them. Specifically speaking, one or more slits 8 are formed in a part 3a of the bottom chamber wall of the high-frequency heating chamber, and the end 9 of the opening 9 of the thawing chamber 3 surrounding these slits
a is fixed to a portion 3a of the bottom chamber wall so as not to transmit microwaves. It is preferable that a low dielectric loss heat insulating material 10 is provided in the vicinity of the thus fixed opening 9 to seal and close the aperture 9, and a low dielectric loss plastic cover 11 is provided below the heat insulating material 10.

The lengthwise dimension of the slit 8 is one quarter of the wavelength λ of the microwave guided into the high frequency heating chamber 3.
It is better that it is above. (See Figure 3, W≧1/4
λ).

In addition, the bottom chamber wall portion 3 other than the chamber wall 5a of the freezer chamber 5 provided on the left side of the thawing chamber 4 (with respect to FIG. 2) and the part 3a of the bottom chamber wall of the high frequency heating chamber 3
b and the chamber wall 4a of the thawing chamber 4, there is a heat insulating material 12
A plastic cover 13 is interposed to line this. Also, the upper end 5 of the freezer chamber 5
b is fixed to the bottom chamber wall portion 3b of the high-frequency heating chamber 3, and its lower right end portion 5C is fixed to the chamber wall 4a of the thawing chamber 4.

A refrigerant passage 14 of a refrigeration cycle (not shown) is attached along the outer chamber wall surface 5d of the freezer chamber 5, and a portion 15 thereof is attached along the outer chamber wall surface 4b of the thawing chamber 4. These refrigerant passages are surrounded by a heat insulating material 16 to keep them cool.

Next, the effects that occur when the high frequency heating device of the present invention is used will be explained.

Now, the item to be thawed (frozen food) is placed in the thawing chamber 4, the door 6 is closed, and thawing is started by operating the thawing operation means (switch, dial, etc.) provided in front of the high-frequency heating device. It shall be assumed that Therefore, the microwaves from the magnetron are stirred by the starvation fan and are heated in the high frequency heating chamber 3.
At the same time, a desired refrigerant is circulated in the refrigerant passage 14.

Among the microwaves in the high-frequency heating chamber 3, the microwaves propagated to the slit 8 (high-frequency heating chamber 3
A portion of the microwaves sent into the chamber passes through the slit 8 and heads toward the thawing chamber 4. At the same time, hot air within the high-frequency heating chamber 3 also passes through the slit 8, but this hot air is completely blocked by the heat insulating material 10 and does not enter the thawing chamber 4.

Before the microwave passing through the slit 8 enters the thawing chamber 4, it is transmitted through a heat insulating material 10 and a plastic cover 11 having a low dielectric loss. The transmitted microwave is radiated into the thawing chamber 4 and heats the object to be thawed therein.

In this way, the object to be thawed is heated and cooled by the refrigerant circulating in the refrigerant passage 15. Its cooling capacity is not affected by outside air due to the heat insulating material 16.

The heating ability of the microwave and the cooling ability of the refrigerant create and maintain a desired thawing atmosphere, that is, a low-temperature atmosphere around 0° C. for the object to be thawed in the thawing chamber 4. As a result, the object to be thawed is slowly thawed. In other words, the thawing performance of the object to be thawed is improved.

It has been confirmed that such defrosting performance can be improved by selecting the lengthwise dimension W of the slit 8 to be W≧1/4λ with respect to the wavelength λ of the microwave.

Furthermore, the freezer chamber 5 is thermally isolated from the high frequency heating chamber 3 and the thawing chamber 4 by a heat insulating material 12.
6 thermally isolated from the outside air, there is no heat input into the freezer chamber 5, and the cooling temperature, that is, the freezing temperature, determined by the cooling capacity of the refrigerant passage 14, is approximately -20°C.
The inside of the freezer is kept at ℃.

Furthermore, when the high-frequency heating chamber is not in use, it is thermally isolated from the high-frequency heating chamber 3 by the heat insulating material 10.
The thawing chamber 4 can be used as a freezer.

Note that there is no restriction on the installation position of the thawing chamber with respect to the high-frequency heating chamber.

As is clear from the above explanation, according to the present invention, the object to be thawed can be thawed in a low-temperature atmosphere that is desirable for thawing, so thawing performance is improved, and the thawing chamber can also be used as a freezer, which has highly practical effects. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the high-frequency heating device of the present invention, FIG. 2 is a vertical sectional view taken along the line -- in FIG. 1, and FIG. 3 is a plan view of only the bottom wall of the high-frequency heating chamber. In the figure, 1 is a high-frequency heating device, 3 is a high-frequency heating chamber, 4 is a thawing chamber, 8 is a slit, 9 is an opening, 10
15 is a refrigerant flow path, and 16 is a heat insulating material.

Claims (1)

[Claims for Utility Model Registration] 1. In a high-frequency heating device for heating and cooking food by introducing microwaves into a high-frequency heating chamber, a thawing chamber is provided outside a part of the chamber wall of the high-frequency heating chamber, and the high-frequency heating A slit is formed between the heating chamber and the thawing chamber, a low dielectric loss heat insulating material is provided in a chamber on the thawing chamber side of the slit to close the slit, and a refrigerant passage is provided on the outer peripheral wall of the thawing chamber. The temperature of the food to be cooked stored in the thawing chamber is brought to a desired thawing temperature by heating by microwaves from the slit and cooling by the refrigerant passage, and the food to be thawed is thawed. A high-frequency heating device featuring: 2. The high-frequency heating device according to claim 1, wherein the lengthwise dimension of the slit is set to be one quarter or more of the wavelength of the microwave.