JPS6335286Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a microwave oven for thawing and cooking food, and the purpose of this invention is to enable good thawing of frozen food.

Conventionally, when thawing a frozen food using a microwave oven, a heating means is driven by a driving section at a predetermined output for a predetermined period of time based on thawing processing conditions stored in a storage section to heat the frozen food and thaw the frozen food. It is done.

However, since the thawing processing condition is one, the heating means always operates with the same output and for the same time regardless of the type of frozen food, and depending on the food to be thawed, there may be parts that are not heated. There is a drawback that thawing cannot be performed satisfactorily because the heating is not uniform and uneven thawing occurs.

This invention was made with the above points in mind, and includes a storage unit that stores thawing processing conditions including thawing time and heating output for various foods, and the operation of a thawing command key to specify the food to be thawed. a command unit that outputs a thawing command signal, reads the thawing processing conditions of the food specified by the thawing command signal from the storage unit, and outputs a drive signal based on the thawing processing conditions read by operating a start key. a heating unit that operates according to the drive signal to heat and defrost the food; a heating unit that operates approximately 1/2 of the thawing time of the food after the start of defrosting and temporarily stops outputting the drive signal; The present invention provides a microwave oven including a stop control section that releases the temporary stoppage of the output of the drive signal by re-operating the start key, and a notification section that notifies the temporary stoppage of the drive signal.

Therefore, according to the microwave oven of this invention,
Approximately 1/2 of the thawing time of the food being thawed from the start of thawing
After a period of , the user can easily recognize that it is time to turn over the food being thawed, and after turning over the food, operate the start key again to defrost the food for the remaining thawing time. By continuing to heat the food, it is possible to uniformly heat the food to prevent uneven thawing, and it is possible to thaw the food satisfactorily.

Next, this invention will be explained in detail with reference to drawings showing one embodiment thereof.

In FIG. 1, 1 is the main body of the microwave oven, 2 is a cooking cabinet door provided on the front of the main body 1 so as to be openable and closable;
3 and 4 are windows and handles made of glass formed on the door 2; 5 is an operating section provided at the front right end of the main body 1; 6 is a start key provided at the lower end of the operating section 5; 7 are 10 numeric keys 0 to 9 arranged at the center lower end of the operation section 5, 8 is a food weight setting key arranged almost at the center of the operation section 5, and 9a to 9.
9c is a time setting key, a temperature setting key, and an output setting key arranged at the upper center end of the operation unit 5;
a to 10c are first to third command keys for defrosting meat, poultry, and fish, respectively, which are arranged in parallel with the setting keys 9a to 9c; 11 is a display section disposed at the upper end of the operation section 5; The cooking time, cooking temperature, magnetron output, which will be described later, etc. are displayed, and a command unit 12 is constituted by the keys 6 to 8, 9a to 9c, and 10a to 10c.

Next, FIG. 2 showing the circuit connection of the microwave oven in FIG. 1 will be explained.

In the figure, 13a and 13b are first and second terminals connected to an AC power source AC, 14 is a latch switch whose one end is connected to the first terminal 13a, and 15 is a latch switch whose one end is connected to the other end of the latch switch 14, and which is connected to the door. 16 is a fuse connected at one end to the second terminal 13b; 17 is a monitor switch connected at both ends to the other end of the latch switch 14 and the other end of the fuse 16; 18; 19 is a first transformer whose one end of the primary winding 18a is connected to the other end of the door switch 15;
A rectifier diode is connected to one end of the secondary winding 18b, 20 is a high-voltage capacitor whose both ends are connected to the other end of the secondary winding 18b and the anode of the diode 19, and 21 is a magnetron serving as a heating means. The anode of is diode 19
One end of the heater of the magnetron 21 is connected to one end of the tertiary winding 18c of the first transformer 18 and the anode of the diode 19, and the other end of the heater is connected to the tertiary winding 18c.
connected to the other end.

22, both ends of the primary winding 22a are the first terminals 13a.
and a second transformer connected to the other end of the fuse 16, and 23 is a microcomputer (hereinafter referred to as microcomputer), which determines the defrosting time and output of the magnetron 21 for defrosting frozen meat, poultry, and fish. Defrosting processing conditions for the food corresponding to the operated command key are determined by a storage unit storing defrosting processing conditions and a defrosting command signal from the command unit 12 by operating any one of the command keys 10a to 10c. a drive unit that reads out a drive signal from the storage unit and outputs a drive signal based on the read conditions; and a drive unit that operates after 1/2 of the thawing time of the food after the start of thawing to temporarily stop outputting the drive signal and start the drive signal. A stop control unit that cancels the temporary stop of the output of the drive signal by re-operating the key 6, and a stop control unit that notifies the user of the temporary stop of the magnetron 21 due to the temporary stop of the output of the drive signal, and allows the user to turn over the food being thawed. It is equipped with an information department that promotes

Note that by operating the start key 6 again, the temporary stop of the output of the drive signal from the drive unit by the stop control unit is canceled, the drive signal is output again from the drive unit, and the food is thawed for the remaining thawing time. will continue again.

At this time, for large-volume foods such as meat, poultry, and fish, the difference in distance between the microwave irradiation port of the magnetron 21 and each part of the food surface causes a difference in the degree of microwave energy absorption. There is a difference, and more microwave energy is absorbed in areas where thawing has progressed quickly, leading to variations in the finished product of thawing, and it is not possible to sufficiently suppress the above-mentioned variations by simply rotating the food using a turntable or the like. However, as mentioned above, by turning the food over when half of the thawing time has elapsed and then continuing thawing for the remaining thawing time, the above-mentioned variation in the thawing finish can be considerably suppressed, and the food can be thawed more uniformly. It becomes possible to do so. 24 is an oscillation control relay for the magnetron 21, a relay coil 24a is connected to the microcomputer 23, and both ends of the relay contact 24b are connected to the other end of the fuse 16 and the other end of the primary winding 18a of the first transformer 18. The relay coil 2 is activated by the drive signal.
4a is excited and the relay contact 24b is turned on.

Next, the operation of the above embodiment will be explained.

Now, calculate the relationship between the weight of the frozen food to be thawed and the thawing time in advance, and as shown in Figure 3, the standard weight is when the food weight is 500g, and the thawing time at this time is used as the standard time to calculate each weight. The magnification of the thawing time with respect to the reference time is derived and stored in the storage section of the microcomputer 23, and the thawing processing conditions for standard weight meat, chicken, and fish are stored in the storage section.

When defrosting standard weight beef, chicken, and fish, the first to third command keys 10a to 10 are used.
By pressing c respectively, the driving section reads out the thawing processing conditions for meat, chicken, and fish from the storage section, and by pressing the start key 6, the driving section reads driving signals based on the respective conditions. is output and relay contact 24b turns on,
The magnetron 21 is energized via the first transformer 18 to perform heating and thawing.

At this time, the thawing time, which is the reference time for the thawing processing conditions for standard weight beef, is T ₁ , and the magnetron 21 is
If the output is 600W for 0.17T ₁ hour from the start of defrosting, and 200W for the remaining 0.83T ₁ hour, then if we express this condition as a relationship between time and the output of magnetron 21, it becomes as shown in Figure 4, The thawing time, which is the standard time for thawing processing conditions for standard weight chicken, is T ₂ ,
If the output of magnetron 21 is 480W for 0.3T ₂ hours from the start of defrosting, and 200W for the remaining 0.7T ₂ hours,
If this condition is expressed as a relationship between time and the output of the magnetron 21, it becomes as shown in Fig. 5, where the thawing time under the thawing treatment conditions for a standard weight fish is T ₃ and the output of the magnetron 21 is 0.7T ₃ from the start of thawing. If the time is 350W and the remaining 0.3T is 200W for ₃ hours, then if we express this condition as a relationship between time and the output of the magnetron 21, it will become as shown in Figure 6, and the standard weight of beef, chicken, and fish will be , respectively, are decompressed according to the conditions shown in FIGS. 4 to 6.

Then, the beef, chicken, and fish are thawed, and the total thawing time is a predetermined time from the start of thawing.
When half of T ₁ , T ₂ , and T ₃ , that is, 0.5T ₁ hour, 0.5T ₂ hours, and 0.5T ₃ hours have passed, the stop control section stops outputting the drive signal from the drive section, and the relay coil 24a is de-energized, the relay contact 24b turns off, the energizing path to the magnetron 21 is opened, the magnetron 21 stops operating, the defrosting of the beef, etc. is temporarily stopped, and the user is warned to turn over the food being defrosted. is issued, the food is turned over, and the door 2 is closed, the drive signal is output again from the drive section and the magnetron 21
is activated, heating and thawing is restarted and continued according to each of the above conditions, and the thawing times T ₁ , T ₂ , T ₃ of each of the above conditions are determined.
After , the output of the drive signal from the drive section is completely stopped, the operation of the magnetron 21 is stopped, and the defrosting is completed.

Next, when defrosting 1 kg of beef, which is twice the standard weight, press the first command key 10a, press the food weight setting key 8, and then press "2" on the number key 8 corresponding to twice the standard weight. By pressing the `` key, the driving section reads out the thawing processing conditions for the standard weight of meat from the storage section, and at the same time, based on FIG. A magnification of 1.6 is read out, and the decompression time T ₁ under the above conditions _is
Replaced with 1.6T ₁ multiplied by 1.6, from the start of decompression
For 0.17T ₁ × 1.6 hours, or 0.272T ₁ hour, the output of magnetron 21 is controlled to 600W, and the remaining
0.83T ₁ × 1.6, that is, 1.328T ₁ hour, the output of the magnetron 21 is controlled to 200W, thawing is performed, and 0.8T ₁ hour, which is half of the total thawing time 1.6T ₁ , has passed from the start of thawing, as described above. At this point, the operation of the magnetron 21 is temporarily stopped.

Note that even when thawing meat, chicken, or fish that is heavier or lighter than the standard weight, thawing is performed in the same manner as described above, and thawing is temporarily stopped.

Therefore, according to the embodiment, the microcomputer 2
Since the notification section 3 notifies that the magnetron 21 has temporarily stopped, the user can easily recognize from the notification section of the microcomputer 23 that it is time to turn over the food being thawed. By turning the food over and operating the start key 6 again to continue defrosting for the remaining defrosting time, the food can be heated uniformly and uneven thawing can be prevented. This allows for good thawing of .

Furthermore, when 1/2 of the thawing time has elapsed,
By turning the food over, the food can be thawed more evenly.

In addition, since the storage unit stores the thawing processing conditions according to the type of food to be thawed and the relationship between food weight and thawing time shown in Figure 3, thawing can be done under optimal conditions according to each food and food weight. can be done.

[Brief explanation of the drawing]

The drawings show one embodiment of the microwave oven of this invention, in which Fig. 1 is a front view, Fig. 2 is a wiring diagram, Fig. 3 is a relation between food weight and thawing time with respect to reference time for each weight, and Fig. Figures 4 to 6 are diagrams showing the relationship between time and magnetron output, respectively, showing conditions for defrosting meat, chicken, and fish. 12...Command Department, 21...Magnetron, 23
...Microcomputer.

Claims (1)

[Scope of Claim for Utility Model Registration] A storage unit that stores thawing process conditions including thawing time and heating output for various foods, and a command unit that outputs a thawing command signal by operating a thawing command key that specifies the food to be thawed. and a drive section that reads out the thawing processing conditions for the food designated by the thawing command signal from the storage section and outputs a drive signal based on the thawing processing conditions read out by operating a start key; a heating means that operates to heat and defrost the food; and a heating unit that operates approximately 1/2 of the thawing time of the food after the start of defrosting to temporarily stop outputting the drive signal, and restarting the drive by re-operating the start key. A microwave oven, comprising: a stop control unit that releases a temporary stop in the output of a signal; and a notification unit that notifies the temporary stop of the drive signal.