JPH0355486A - Refrigerator with high frequency thawing device - Google Patents

Abstract

PURPOSE:To reduce a weight and a volume, to eliminate a ground, and to simplify a radio wave leakage prevention by partitioning part of a boundary between a thawing chamber and a cold storage chamber by a waveguide, partitioning the remaining boundary by a ventilating high frequency shutoff wall and providing a low voltage magnetron in the waveguide through an insulating member. CONSTITUTION:A low voltage magnetron 6 is arranged in a waveguide 8 through an insulating member 7. A frozen food 4 placed in a thawing chamber 3 is started to be thawed by closing a switch 14 when a door 11a is closed and a thawing switch provided out of the room is pressed, by operating a thaw detection sensor 5, a low voltage magnetron 6, a driving power source 12, a cathode heating power source 13, a controller 156, and a high frequency agitating stirrer 17, and by radiating high frequency to the food. When the thawing is advanced and ice is converted to water, the high frequency absorptivity of the food is raised, a high frequency electric field detected by the sensor 5 is reduced, and end of thawing is determined when the detected field becomes minimum. Then, all the power sources are turned OFF. Since the part of the boundary between the thawing chamber and the cold storage chamber is partitioned by a ventilating high frequency shutoff wall 10, chilled gas in the cold storage chamber is fed even after the end of thawing,thereby preserving the food at cold storage temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigerator equipped with a high-frequency thawing device that stores frozen foods in a refrigerated state after thawing them with high-frequency waves. 2. Description of the Related Art As shown in FIG. 5, this type of conventional device applies high frequency waves from a direction 1, reflects the waves through a stirring stirrer 2, enters a thawing chamber 3, and irradiates frozen foods 4 with the high frequency waves. After thawing, a high-frequency detection antenna 5 measures and detects changes in the high-frequency electric field inside the thawing chamber 3. (For example, JP-A-61-153483, JP-A-61-1
However, in the above structure, the high frequency input from one direction drives the magnetron with a drive voltage of 4 kV or more,
The instantaneous high frequency output of 500 W is time-controlled to an average of 200 W.
Decompressing by irradiating high-frequency W waves posed the following problems.

■ Requires a high-voltage transformer as a drive power source, increasing weight and volume. ■ Because high voltage is used, insulation is complicated and requires grounding. ■ Because high-frequency power enters momentarily, the defrosting chamber, especially the door, requires a complex structure to prevent radio wave leakage. ■ Because the thawing room is separated from the refrigeration room, refrigerated storage after thawing tends to be incomplete.

The present invention is intended to solve such conventional problems, and aims to provide a simple and compact refrigerator equipped with a high-frequency thawing device that stores frozen foods in a refrigerated state after thawing. Means for Solving the Problems In order to solve the above problems, the refrigerator with a high-frequency thawing device of the present invention has a thawing detection sensor installed in the thawing chamber and a part of the boundary between the refrigerator compartment and the refrigerator compartment, which are partially partitioned by a waveguide. a thawing chamber separated by a breathable high-frequency shielding wall, a low-voltage magnetron provided in the waveguide via an insulating member, a driving power source, a cathode heating power source connected to this, and the thawing detection sensor. It has a structure that includes a wired control section and an on/off switch wired to it. Effects The present invention has the above-described structure. (1) By installing a low-voltage magnetron, a high-voltage transformer is not required, insulation is simplified, and since thawing is performed with a high-frequency output of about 200 W, it is possible to prevent radio wave leakage in the thawing chamber. is simplified. ■ By partitioning part of the border between the thawing room and the refrigerator room with a breathable high-frequency shielding wall, it is possible to reliably store the product in the refrigerator after thawing. EXAMPLES Hereinafter, examples of the present invention will be explained based on the attached drawings. Figure 1. In FIG. 2, reference numeral 6 denotes a low voltage magnetron driven at 400 W, with an anode having 24 cavity resonators and a cathode disposed concentrically with the anode at the center of the anode. This magnetron 6 is fitted and assembled into a waveguide 8 in which a high-frequency stirring stirrer 2 is disposed via an insulating member 7. The length of this fitting portion is determined to be one quarter of the propagation wavelength of the fitting portion, which is obtained based on the internal wavelength of the high frequency wave transmitted in the waveguide 8 and the wavelength compression ratio by the insulating member 7. ．． A thawing detection sensor 5 is disposed in the thawing chamber 3, and a part of the boundary between the thawing chamber 3 and the refrigerator chamber 9 is partitioned off by the waveguide 8, and the remaining boundary is an air permeable high frequency blocking wall 10 made of stainless steel wire mesh. It's partitioned off. The inside of the thawing chamber door 11a is made of thin metal @11 to prevent leakage of radio waves. As shown in FIG. 2, the low voltage magnetron 6 is connected to a small and lightweight full-wave voltage doubler rectifier circuit 12 consisting of a capacitor and a diode, and a cathode heating switching power supply circuit 13, and both power supplies are connected to a commercial power supply 15 via an on/off switch 14. It is connected to. The thawing detection sensor 5 disposed in the thawing chamber 3 is connected to the control unit 16, and
6 is connected to a commercial power source 15 via an on/off switch 14. Magnetron drive power supply 12 and open/close switch 14
A high-frequency stirring stirrer 17 is connected between the two. The frozen food 4 placed in the thawing chamber 3 according to the above structure is placed in the door 1.
1a and press the defrost switch installed outdoors, the open/close switch 14 closes, and the defrost detection sensor 5, low voltage magnetron 6, drive power source 12. Power supply for cathode heating 13. Control unit 16. The high-frequency stirrer 17 operates, and the frozen food is irradiated with high-frequency waves to begin thawing. As the thawing progresses and the ice changes to water, the high-frequency absorption rate of the food increases, and the high-frequency electric field detected by the thawing detection sensor 5 decreases, and when it becomes minimum, thawing is completed and all power supplies are turned off. In this structure, a part of the boundary between the thawing room and the refrigerator room is a breathable high frequency blocking wall 1.
Since it is partitioned by 0, cold air from the refrigerator compartment can flow in even after thawing, allowing food to be stored at refrigeration temperature. Next, another embodiment of the present invention is shown in FIG. This will be explained using Figure 4. The difference from the previous embodiment is that a branched waveguide 17 is provided, and this arrangement has the effect of eliminating thawing unevenness because high frequency waves enter from the top and bottom surfaces of the thawing chamber 3. As shown in FIG. 4, the wiring diagram of this embodiment differs from the previous embodiment in that there is no stirrer 2 for high frequency stirring.

Effects of the Invention As described above, the refrigerator with a defrosting chamber of the present invention provides the following effects. (1) Since a low-voltage magnetron is installed, it is possible to provide a refrigerator with a defrosting chamber that is small in weight and volume, does not require grounding, and has simplified measures against radio wave leakage. (2) By partitioning part of the boundary between the thawing room and the refrigerator room with a breathable high-frequency shielding wall, it is possible to reliably store the food in the refrigerator after thawing.

[Brief explanation of drawings]

Claims (1)

[Claims] A thawing detection sensor installed in the thawing chamber, a thawing chamber in which part of the boundary between the refrigerator compartment is partitioned by a waveguide, and the remaining boundary is partitioned by a breathable high frequency blocking wall, and the waveguide is connected to the thawing chamber through an insulating member. A refrigerator with a high-frequency defrosting device, which includes a low-voltage magnetron, a driving power source connected to the low-voltage magnetron, a cathode heating power source connected to the low-voltage magnetron, a control unit connected to the defrosting detection sensor, and an open/close switch connected to the control unit. .