JPS62172175A - 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 Field of Industrial Application The present invention relates to a refrigerator equipped with a high-frequency thawing device for thawing 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 heating device will be explained with reference to FIGS. 6 to 9.

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 this thawing chamber from a high frequency generator 6 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 a fan that causes forced convection of cold air into the freezing compartment 3 and thawing compartment 4. Sho 21
is a cooler, and 23 is a compressor.

The thawing chamber 4 is composed of a metal box 9 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.

Next, the operation of a conventional refrigerator with a high-frequency thawing device will be explained with reference to the timing chart of FIG. 8 and the diagram of FIG. 9 showing changes in center and surface temperatures of frozen products. Thawing time is 3rd stage T
I, T2. Consists of T3.

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
2, the high frequency generator 6 is stopped, and the temperature difference between the surface and center of the frozen product 13 is equalized by heat conduction of the frozen product 13 itself, and the third stage T
3, the high frequency generator 6 is operated intermittently so as to provide a weak high frequency output during the first stage, 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 Compared to the earlier system in which the high-frequency generator was simply operated intermittently, the above configuration eliminates uneven thawing caused by changing the heating time and causing parts of the surface to boil. However, in order to enable short-time defrosting, the high-frequency output cannot be weakened extremely;
Therefore, as a characteristic of high-frequency thawing, the intensity of the high-frequency wave attenuates as it penetrates into the food, so there is still the problem of uneven thawing in which the surface temperature rises compared to the center.

The present invention aims to enable short-time thawing, reduce the temperature difference between the center and surface of frozen products to be thawed, and save power.

Means to Solve the Problems In order to achieve this object, the refrigerator with a high-frequency defrosting device of the present invention has a compressor with variable capacity, a cold air circulation fan with variable rotation speed, and cold air ventilation holes in the walled freezer compartment. When the high-frequency generator is in operation, the compressor is operated at high capacity and the cold air circulation fan is operated at high speed; when the high-frequency generator is stopped, the compressor is operated at low capacity and the cold air circulation fan is operated at low speed. It is.

Function The present invention, with the above-described configuration, blows cold air onto the frozen product during thawing, and reduces the capacity of the compressor and cold air circulation fan while the high frequency generator is stopped.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show cross sections of a thawing chamber and a waveguide in an embodiment of the present invention. The installation positions of the refrigerator body and the high frequency generator are the same as in the conventional example. Reference numeral 4 denotes a thawing chamber, which is composed of a metal box 9 that reflects radio waves, and a door body 12 with a metal plate 10 for radio wave reflection attached to the inside and a radio wave absorber 11 such as ferrite embedded around it, which can be opened and closed. It is free. 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. At the rear of the upper surface of the box body 9, there is an inflow ventilation hole 14 that allows cold air forced to flow from the 77-channel 8 to flow into the thawing chamber 4;
An outflow ventilation hole 16 is provided at the front of the top surface to allow the cold air that has entered the thawing chamber 4 to flow out.

Next, an electric circuit diagram of a refrigerator with a high-frequency heating device will be explained with reference to FIG. 16 is the electric circuit of the refrigerator.

Reference numeral 17 denotes a commercial AC power supply, and 18 indicates an internal temperature regulator which is closed when the internal temperature reaches a predetermined temperature or higher. Reference numeral 19 denotes a defrost timer for switching and controlling cooling operation and defrosting operation, and its normally open contact a is connected to the defrosting heater 22 of the cooler 21 via a bimetal thermostat 20, and its normally closed contact is connected to the A variable capacity compressor 23' and a variable rotation speed cold air circulation fan 8' are connected in parallel via an internal temperature regulator 18. Next, the high frequency generation circuit 24 will be described. 26 is a defrost switch with a manual defrost time adjustment function; 26 is a defrost timer; a first time switch 27, a second time switch 28, and a third time switch;
It is equipped with a time switch 29. This M freeze timer 26
When the defrosting switch 26 with a defrosting time adjustment function is used to set the defrosting time and the defrosting switch is turned on, the first time switch 27 changes to 0N10FF L in a predetermined cycle, the high frequency generator 6 is energized, and the high frequency radio waves penetrate the waveguides. The light propagates and is irradiated to the frozen product 13 in the thawing chamber 4 through the power supply aperture and thawed. Further, the second time switch 28 is inserted between the compressor 23 and the power line L1, its contact a is connected to a high capacity operation terminal (not shown) of the variable capacity compressor 23', and its contact is connected to the standard capacity operation terminal. The contact C is connected to a low capacity operation terminal (not shown). Further, the third time switch 29 is inserted between the variable rotation speed cold air circulation fan 8' and the power line L1, and its contact a is connected to the high speed rotation operation terminal (not shown) of the rotation speed variable cold air circulation fan 8'. The contact C is connected to a standard rotation terminal (not shown), and the contact C is connected to a low speed rotation operation terminal (not shown).

Next, the operation of the refrigerator equipped with the high frequency thawing device will be explained according to the timing chart shown in FIG. 4 and the changes in surface and center temperatures of frozen products shown in FIG. When the defrosting switch 25 with a defrosting time adjustment function is turned on, the first time switch 27 is turned on in a predetermined cycle. Therefore, the high frequency generator 6 is energized and turns 0N10FF in a predetermined cycle. To explain the defrosting operation in detail, the defrosting time is 3rd period T1. T2
．． Consists of T3. In the first stage T1, the high frequency generator 6 is continuously operated to defrost the air, the variable capacity compressor 23' is operated at high capacity, and the variable speed cold air circulation fan 8' is operated at high speed, so that the surface temperature rise is prevented. to prevent the difference from the center temperature from widening too much. In the second period T2, the operation of the high frequency generator 5 is stopped, and during this period the variable capacity compressor 23'
is operated at low capacity, and the variable rotational speed cold air circulation fan 8' is operated at low speed to reduce only the surface temperature by weak cold air and reduce the difference from the center temperature.

In the third period T3, the high frequency generator 6 is operated intermittently so that the high frequency output is weaker than that in the first period T1, and when the high frequency generator 6 is ON, the variable capacity compressor 23' and the variable rotation speed cold air circulation fan 8 are operated intermittently. ' is operated at high capacity and high speed, and conversely when it is OFF, it is operated at low capacity and low speed. When the high frequency generator 5 is ON, it suppresses the rise in surface temperature of frozen products with powerful cold air, and when it is OFF, it suppresses the rise in surface temperature of frozen products. The temperature at the surface and center is made uniform by weak cold air, and the center temperature of the final frozen product 13 is raised to around -3°C to complete thawing.

As described above, by operating the variable capacity compressor 23' and variable rotational speed cold air circulation fan 8' at high capacity and high speed/low capacity and low speed according to 0N10FF of the high frequency generator 6, the thawing chamber 4 is Strong/weak cold air is blown onto the surface of the frozen product 13 from the cold air inflow vent 14 to suppress the temperature rise on the surface and eliminate temperature unevenness between the surface and the center.When the high frequency generator 6 is OFF, the variable capacity compressor is activated. 23' and the variable rotational speed cold air circulation fan 8' are operated at low capacity and low speed, thereby reducing power consumption.

Effects of the Invention As described above, the present invention comprises a thawing chamber provided inside the refrigeration chamber and having a cold air ventilation hole, a high frequency generator provided outside the refrigeration chamber, a waveguide for guiding high frequency waves into the thawing chamber, and a variable capacity compressor. , a variable rotation speed cold air circulation fan, and a variable rotation speed cold air circulation fan that operates the high frequency generator continuously or intermittently including a predetermined stop time during defrosting, and when the high frequency generator is in operation, the variable capacity compressor and the variable rotation speed cold air fan. The circulation fan is controlled to operate at high capacity and high rotational speed, and when the high frequency generator is stopped, the variable capacity compressor and variable rotational speed cold air preparation fan are operated at low capacity and rotational speed.
151J running at low rotation speed? Since it is composed of a defrosting timer, the high-frequency generator blows strong cold air onto the surface of the frozen product during operation to suppress the rise in surface temperature, and when the high-frequency generator is stopped, compressed ice and cold air are This reduces the capacity of the circulation fan to suppress the rise in surface temperature, prevents uneven thawing between the surface and center, improves thawing quality, and achieves power savings.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the defrosting chamber in an embodiment of the present invention, FIG. 2 is a top view of the defrosting chamber in FIG. 1, and FIG. 3 is an electric circuit diagram of the refrigerator in an embodiment of the present invention. Figure 4 is the time chart of Figure 3, Figure 6 is a diagram showing the correlation between thawing time and frozen food temperature in Figure 3, Figure 6 is a cross-sectional view of the conventional refrigerator, and Figure 7 is the conventional example. FIG. 8 is a time chart of FIG. 7, and FIG. 9 is a diagram showing the correlation between the thawing time and frozen food temperature of FIG. 7. 2...Refrigerating room, 4...Defrosting room, 5...
・High frequency generator, 6... waveguide, 8'...
...Variable rotational speed cold air value ring fan, 14...Cold air inflow vent, 23'...Variable capacity compressor, 26
・・・・・・Defrost timer. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
Thawing chamber Fig. 2 5- Fan for Tonami decoy δ′・-Rotating Masahiki decoy A meter σ Fig. 3
23'-Revision and force variable sword 4■曵26--The square rod moat timer Figure 4 Figure 5 □ Solution] East time gate Figure 6 Figure 7

Claims (1)

[Claims] A thawing chamber provided inside the refrigerator compartment and having a cold air ventilation hole, a high frequency generator installed outside the refrigerator compartment, a waveguide that guides high frequency waves into the thawing chamber, a variable capacity compressor, a variable rotation speed cold air circulation fan, and a thawing device. At times, the high frequency generator is operated continuously or intermittently, including a predetermined stop time, and when the high frequency generator is in operation, the variable capacity compressor and the variable speed variable cold air circulation fan are operated at high capacity and high rotation speed. A refrigerator with a high frequency defrosting device comprising a defrosting timer that controls operation and controls the operation of the variable capacity compressor and the variable rotation speed cold air circulation fan at low capacity and low rotation speed when the high frequency generator is stopped.