JPS62299685A - Refrigerator with high-frequency thawing 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 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a refrigerator equipped with a high frequency defrosting device for defrosting frozen foods.

Conventional technology In recent years, with the addition of quick freezing functions to refrigerators,
Home freezing is becoming popular.

However, when it comes to thawing frozen foods, methods such as leaving them to thaw naturally, leaving them to thaw in the cold room of a refrigerator, and thawing them using a microwave oven have not been satisfactory in terms of thawing time and thawing quality.

Therefore, various refrigerators with high-frequency defrosting devices have been proposed that enable rapid defrosting by installing a high-frequency generator inside the refrigerator.

Hereinafter, an example of a conventional refrigerator with a high frequency defrosting device will be explained with reference to FIGS.

Reference numeral 1 denotes a refrigerator main body, which has a refrigerator compartment 2 and a freezing compartment 3, and a thawing compartment 4 for frozen foods is installed in the refrigerator compartment 2. Radio waves are supplied to the defrosting chamber from a high frequency generator 5 installed in the machine room at the bottom of the refrigerator body 1 through a waveguide 6. This is done through the power supply lower. Also, 8 is the refrigerator compartment 2. This is an internal fan that causes forced convection of cold air into the freezing compartment 3 and thawing compartment 4.

The thawing chamber 4 is composed of a box body 9 made of metal that reflects radio waves, and a door body 12 with a metal plate 1o for radio wave reflection attached to the inside and a radio wave absorber 11 such as ferrite embedded around the box body 9. It can be opened and closed freely.

A waveguide 6 is attached to the upper surface of the box 9, and communicates between the waveguide 6 and the thawing chamber 4 at the lower part of the power supply.

Next, the operation of the conventional refrigerator with a high-frequency thawing device will be explained with reference to the timing chart of FIG. 7 and the diagram of FIG. 8 showing changes in center and surface temperatures of frozen products. Thawing time is 3rd stage T
I, T2. T3 will also be made.

In the first period T1, the high frequency generator is operated continuously or intermittently to raise the surface temperature of the frozen product 13 to around 0''C, and in the second period T
In step 2, the high frequency generator 5 is stopped and the temperature difference between the surface and center of the frozen product 13 is made uniform by heat conduction of the frozen product 13 itself, and the third stage T
In step 3, the high frequency generator 5 is operated intermittently so that the high frequency output is weaker than that in the first period, and the center temperature of the frozen product 13 is raised to around -3° C., and thawing is completed.

Problems to be Solved by the Invention However, with the above configuration, the microwave has a characteristic that its strength attenuates as it penetrates into the food, and in ordinary food, the strength attenuates to about 37% at 5 crn. Therefore, in the case of thick foods, there is a large temperature difference between the surface and the center, resulting in uneven thawing.

In view of the above drawbacks, the present invention provides a refrigerator equipped with a high-frequency thawing device that reliably suppresses the temperature rise on the surface of frozen products and prevents uneven thawing between the surface and the center.

Means for Solving the Problems In order to achieve this object, the refrigerator with a high-frequency thawing device of the present invention has a thawing chamber having a cold air vent and a high-frequency generator that operates intermittently including a predetermined stop time during thawing. A high frequency generator control means, a damper provided near the cold air vent of the thawing chamber, a damper control device that opens and closes the damper in accordance with the operation of the high frequency generator, and a compressor that opens and closes the damper in accordance with the operation of the high frequency generator. It consists of a compressor control device that operates the compressor.

Function: With this configuration, during the thawing time, the high-frequency generator operates the compressor and forcibly opens the damper, ensuring that cold air is sent into the thawing chamber, suppressing the temperature rise on the surface of the frozen product, This means that uneven thawing will not occur.

EXAMPLE An example of the present invention will be described below with reference to the drawings. The installation positions of the refrigerator body and the high frequency generator are the same as in the conventional example.

FIG. 1 shows a sectional view of a thawing chamber in an embodiment of the present invention. The thawing chamber 4 is made of metal and has a box body 9 that reflects radio waves.
It consists of a door body 12 with a metal plate 10 for reflecting radio waves attached on the inside and a radio wave absorber 11 such as ferrite embedded around it, and can be opened and closed freely. A waveguide 6 is attached to the upper surface of the box 9, and communicates between the waveguide 6 and the thawing chamber 4 at the lower power supply amount. On the back side of the box body 9, there is a cold air inflow vent 14 that allows forced convection from the fan 8 and cold air that has passed through a damper 16, which will be described later, to flow into the thawing chamber 4, and on the front of the top surface that allows the cold air that has flowed into the thawing chamber 4 to flow out. Cold air outflow vent 1
5 is set. A damper 16 controls the inflow of cold air into the thawing chamber 4 by opening and closing.

FIG. 2 shows an electric circuit of a refrigerator with a high-frequency defrosting device according to an embodiment of the present invention. 17 is the electric circuit of the refrigerator. The electrical circuit 17 of this refrigerator is connected to a commercial AC power source 18, an internal temperature regulator 19 that closes when the internal temperature reaches a predetermined temperature, and a mechanical timer 20, which will be described later. Further, 20 is a mechanical timer for switching and controlling cooling operation and defrosting operation, and its normally open contact a is connected to a defrosting heater 22 of the cooler via a bimetal thermometer 21, and its normally closed contact is a compressor. The compressor control device 23, the fan motor 24 that drives the internal fan, and the damper control device 25 are connected to the compressor control device 2.
3 has a compressor 26, and a damper control device 26 has a damper 1.
6 are connected to each other. Next, high frequency generation circuit 2
Reference numeral 028 described in connection with No. 7 is a manual defrost switch. A timer 29 includes a switch 30, a time switch 31, and a switch 32. The switch 30
A high frequency generator 5 is connected to. This timer 2
Reference numeral 9 indicates a high frequency generator control means. This timer 29 sets the defrosting time with the time switch 31,
When the defrosting switch 28 is turned on, the high frequency generator 5 is energized to oscillate radio waves, which propagate through the waveguide 6 and are irradiated onto the frozen products in the defrosting chamber 4 via the lower power supply amount. The switch 32 is synchronized with the time switch 31, and ONL,
Turns off when defrosting is completed.

The operation of the refrigerator with a high-frequency thawing device configured as described above will be explained below in accordance with the timing chart of FIG. 3 and the changes in surface and center temperatures of frozen products shown in FIG. 4. The thawing time consists of three periods T1, T2 and T3. In the first period T1, the high frequency generator 5 is operated continuously or intermittently to raise the surface temperature of the frozen product 13 to around 0°C.
In step 2, the high frequency generator 5 is stopped and the temperature difference between the surface and center of the frozen product 13 is made uniform by heat conduction of the frozen product 13 itself, and the third stage T
At step 3, the high frequency generator 6 is operated intermittently so that the high frequency output is weaker than that of the first period T1, and the center temperature of the frozen product 13 is raised to around -3°C, and thawing is completed.

During the defrosting time, the compressor control device 23 operates the compressor 26 in accordance with the high frequency generator 5, and the damper control device 25 operates the damper 16 in accordance with the high frequency generator 6. According to this embodiment, the refrigerator includes a thawing chamber provided in the refrigerator and having a cold air vent, a high frequency generator, a waveguide that guides high frequency waves to the thawing chamber, and a predetermined stop of the high frequency generator during thawing. a high-frequency generator control means that operates intermittently over time; a damper provided near the cold air vent of the thawing chamber; a damper control device that opens and closes the damper in accordance with the operation of the high-frequency generator; A compressor control device is provided to operate the compressor according to the operation, and at the time of defrosting, the damper is forcibly opened and the compressor is forcibly operated. Since cold air is reliably blown onto the surface of the frozen product 13 through the entire opening 15, the temperature rise on the surface is suppressed, so uneven thawing caused by uneven temperature between the surface and the center can be eliminated, and the quality of thawing can be improved. can be realized. Furthermore, even when the compressor is stopped, the compressor is forced to operate during thawing, so the above effects are more reliable. Furthermore, even when the damper is closed, the damper is forcibly opened during defrosting, so the effect is reliable.

Effects of the Invention As described above, the present invention provides a thawing chamber provided in a refrigerator and having a cold air vent, a high frequency generator, a waveguide for guiding high frequency waves to the thawing chamber, and a thawing chamber for guiding the high frequency wave to the thawing chamber. a high frequency generator control means that operates intermittently including the stop time; a damper provided near the cold air vent of the thawing chamber;
By providing a damper control device that opens and closes the damper in accordance with the operation of the high frequency generator, and a compressor control device that operates the compressor in accordance with the operation of the high frequency generator,
It is possible to reliably suppress the rise in surface temperature of frozen products during thawing, prevent uneven thawing on the surface and center, and improve thawing quality.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a thawing chamber in an embodiment of the present invention, FIG. 2 is an electric circuit diagram of a refrigerator in an embodiment of the present invention,
Fig. 3 is the timing chart of Fig. 2, Fig. 4 is a graph showing the correlation between the thawing time and frozen food temperature of Fig. 2, Fig. 5 is a cross-sectional view of a conventional refrigerator with a high-frequency thawing device, and Fig. 6 The figure is a sectional view of the thawing chamber shown in FIG. 6, FIG. 7 is a timing chart of a conventional refrigerator, and FIG. 8 is a graph showing the correlation between the thawing time and the frozen food temperature shown in FIG. 7. 4... Thawing chamber, 5... High frequency generator, 6... Waveguide, 14... Cold air inflow vent, 16...・Cold air outflow vent, 16...
... Damper, 23 ... Compressor control device, 26.
...damper control device, 26 ...compressor,
29...Timer (high frequency generator control means). Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 □ Open when defrosting Figure 5 Figure 7 Figure 8 -1--→ Open when defrosting

Claims (1)

[Claims] A thawing chamber provided in a refrigerator and having a cold air vent, a high frequency generator, and a waveguide that guides high frequency waves to the thawing chamber;
a high-frequency generator control means that operates the high-frequency generator intermittently including a predetermined stop time during thawing; a damper provided near the cold air vent of the thawing chamber; a damper control device that opens and closes the damper during thawing; A refrigerator equipped with a high-frequency defrosting device and a compressor control device that operates a compressor during defrosting.