JPS6139480A - Deicing device - Google Patents

Abstract

(57) [Summary] 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 thawing device for defrosting and cooking frozen foods using high frequency power.

Configuration of conventional example and its problems Conventional decompressing equipment of this type has a frequency range of 13 MHz to 40 MHz.
There is one that uses a frequency in the MHz shortwave band. This thawing device thaws frozen food by sandwiching it between a pair of parallel plate electrodes.

For this reason, for example, when thawing a frozen cake, one of the parallel plate electrodes must come into contact with the top surface of the cake, and even if the cake can be thawed, the beauty of the cake will be spoiled. That is, a drawback of this type of thawing device is that it is necessary to sandwich the frozen food.

On the other hand, a microwave oven, which is a typical example of a high-frequency heating device, is also used as a defrosting device.

Microwave ovens store frozen foods in a heating chamber.
It has the feature that there is no need to insert it.

However, the microwave oven has only an incidental function for thawing and cooking, and is essentially a heating cooking machine. For this reason, in thawing cooking, a technique has been devised in which the high power generated by the magnetron is supplied to the frozen food in a time-divided manner, and the low power is supplied to the frozen food as a temporal average power. Therefore, portions of frozen food that are thawed quickly will be heated and cooked when high power is supplied. If this is avoided, there will be parts that are not fully decompressed.

That is, the disadvantage of using a microwave oven as a defrosting device is that the magnetron generates a large amount of electric power.

Purpose of the Invention The present invention has been made in view of the above points, and provides a compact thawing device that does not require sandwiching frozen foods, using a high frequency generating means that generates high frequency power of around 100 W in continuous operation. It is something to do.

Structure of the Invention To achieve the above object, the present invention provides a high frequency generating means that generates high frequency power of about 100 W using a frequency on UHFHF, and a thawing device to which this high frequency power is supplied and which stores frozen foods. It consists of a room.

DESCRIPTION OF EMBODIMENTS The present invention will now be described with reference to the drawings. - FIG. 1 is a block diagram of a thawing device showing one embodiment of the present invention, and FIG. 2 is an enlarged view of the main part of FIG. 1.

The bottom wall surface of the thawing chamber 1 that accommodates frozen foods (not shown) is made of a material with good thermal conductivity (for example, aluminum) and has a thickness of about 5 mm and is 250 mm square to 3 mm square.
It is composed of a conductor plate 2 of about 0.00 mm square. A high frequency generating means 3 constructed using a solid state element that generates about 100 W of power using a UHFHF frequency is disposed below this conductor plate.

The high frequency generating means 3 includes an oscillating section 4 that generates an output of several watts to about 20 watts, and an amplifying section 5 that amplifies the oscillation output with general power.
It consists of A solid-state element 6.7 used for the oscillation section and the amplification section is tightly attached to the conductor plate 2 by screws 8.9. Further, the oscillation circuit and the amplifier circuit are constituted by microstrip lines patterned on one side of the printed circuit board 10.

The output end of the amplifying section 5 and the high frequency feeding antenna 11 disposed inside the thawing chamber are connected through a semi-rigid coaxial cage 1v12. In the figure, the feeding antenna is
Although a donut-shaped antenna is shown, the present invention is not limited to this, and may also be configured as a vertical antenna, a loop antenna, or the like.

The operation of the decompressing device having such a configuration will be described below. When frozen food is stored in the thawing chamber and a thawing start signal is input, the high frequency generating means generates high frequency power of about 100W. This high frequency power is transmitted through a semi-rigid coaxial cable and radiated into the thawing chamber by a feeding antenna. This thawing chamber is designed on the same principle as a so-called heating chamber that accommodates foods in a microwave oven. That is, the frozen food is thawed by confining the high frequency power radiated from the feeding antenna into the thawing chamber. At this time, the conductor plate on the bottom wall of the thawing chamber is a means for dissipating power lost by the solid-state elements, so the conductor plate generates radiant heat. That is, 1. Frozen foods are effectively thawed by both the high frequency power radiated from the feeding antenna and the radiant heat from the conductive plate.

Defrosting can be terminated by using a timer or automatically by utilizing the large difference in dielectric constant between water and ice.

The latter will be explained in detail below.

The thawing chamber is designed exclusively for thawing, and the load impedance when looking from the output end of the high-frequency generating means to the thawing chamber side when storing frozen food has a good matching relationship with the impedance of the high-frequency generating means. It is in. From this situation,
When the thawing of the frozen food is accelerated, the load impedance changes significantly because ice, which is a component of the frozen food, changes to water. Therefore, a mismatch occurs between the high frequency generation means and the load impedance, and the power lost by the high frequency generation means increases. For this reason, the case temperature of the solid-state element and the temperature of the conductor plate forming the bottom wall surface of the thawing chamber rise. That is, the upper limit value of the case temperature or the upper limit temperature of the conductor plate (for example, 60° C.) may be determined in advance, and thawing may be automatically terminated when this upper limit temperature is reached.

Effects of the Invention The defrosting device of the present invention having the above configuration has the following effects.

(1) By using one wall of the thawing chamber as a conductor plate that is made of solid-state heat dissipation means, the radiant heat from the conductor plate can be used as a heat source for thawing, resulting in high efficiency with almost no power loss in the equipment. The transformation is measured.

(2) As a decompression-only device, the generated output of the high-frequency generating means is set to be as low as about 100 W, so there is no risk of over-decompression.

(3) By using a thawing chamber with a fixed shape for supplying high-frequency power, there is no need to hold the frozen food between electrodes, and the food can be thawed without damaging the appearance of the thawed food, making it easy to use. good.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a thawing device showing an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts of FIG. 1... Thawing chamber, 2... Conductor plate, 3...
...High frequency generation means. 6,7... Solid-state element. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2

Claims (1)

[Claims] A high-frequency generating means constructed using a solid-state element, a conductor plate serving as a heat dissipation means for the solid-state element, and a frozen food to which the conductor plate serves as one wall and is supplied with high-frequency power generated by the high-frequency generating means are housed. A thawing device equipped with a thawing chamber.