JP2002310436A - High frequency heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability of the finish of cooking and high response of repeated cooking, and save electric power in a preheating state. SOLUTION: A heating chamber 10 is kept to be a preheated state at all times with lower heaters 12, 13, and upon cooking temperature is set higher than preheating temperature, and simultaneous heating is achieved by high frequency power supply from a magnetron 14. After the cooking is finished, the heating chamber 10 is cooled with an air suction fan 17 to quickly return the operation to the preheating state, and a preheated situation in the heating chamber 10 is displayed by a control section 9. Hereby, cooking frequency upon repeated cooking and stability of a result of the cooking are improved, and electric power saving at preheating is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device having a heater heating means.

[0002]

2. Description of the Related Art Conventionally, a configuration in which upper and lower heaters are provided in a heating chamber to preheat the food and simultaneously heat the food together with a high frequency wave so as to shorten the cooking time,
For example, there is one described in JP-A-11-135255. FIG. 6 shows a conventional high-frequency heating device with a heater described in the above publication.

In FIG. 6, reference numeral 1 denotes a heating chamber, 2 denotes an upper heater, 3 denotes a lower heater, 4 denotes a heat block, 5 denotes a temperature detecting means, 6 denotes an operation section, and 7 denotes a rotary antenna for high frequency power supply. During the preheating operation, heat is stored in the heat block 4,
When the operation shifts from the preheating completion state to the cooking operation, the heat block 4
The cooking is performed at a high speed by heat radiation from the heater and high-frequency radiation from the upper heater 2, the lower heater 3, and the rotating antenna 7.

[0004]

However, in the above-described conventional configuration, heat is stored in a heat block having a large heat capacity, so that even if high-speed operation for one cooking is obtained, it takes time for reheating, so that repeated cooking is required. It is difficult to obtain high-speed and stability against heating, and the heating block temperature is the cooking temperature as it is. There was a problem that was appropriate.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and has a configuration in which the recovery to the preheating operation state after the cooking operation is accelerated and the state can be confirmed, thereby achieving high speed and stability for repeated cooking. It is an object of the present invention to provide a high-frequency heating device which is particularly improved for business use.

[0006]

In order to solve the above-mentioned conventional problems, a high-frequency heating apparatus according to the present invention has a function of always continuing a preheating operation and setting a cooking operation temperature higher than a preheating operation temperature. By operating the intake and exhaust means after the cooking operation, not only can the food cooking time be shortened, but also the food quality can be kept stable even when cooking is repeated, This has the effect of increasing the economics of preheating operation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is provided with a means for constantly preheating the heating chamber, so that the temperature during the cooking operation is set higher than that during the preheating operation, and the intake and exhaust means is used after the cooking operation is completed. Because the heating cabinet is forcibly cooled,
During the cooking operation, the cooking speed is fast because there is no intermittent heating of the heater by the temperature control function, and the temperature of the preheating operation is quickly returned to the preheating operation after the cooking is completed. This has the effect of reducing

According to a second aspect of the present invention, by providing a display indicating whether the preheating operation is in a steady state, cooking is repeatedly performed at a frequency exceeding the cooling performance, or the door of the heating cabinet is opened. If there is an abnormality such as being left in a state, the state can be easily determined, so that cooking failure can be prevented beforehand.

According to a third aspect of the present invention, when a more frequent repetitive cooking is requested, a means for detecting the degree of deviation from the steady state of the preheating operation is provided, whereby the cooking time set in advance is set. And the waiting time until the next cooking starts can be further reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is an external perspective view of a high-frequency heating apparatus showing a first embodiment of the present invention. In FIG. 1, reference numeral 8 denotes a door, 9 denotes a control unit, 9a denotes a display unit, and 9b denotes an operation unit.

FIG. 2 is a cross-sectional view of a high-frequency heating apparatus according to a first embodiment of the present invention. An upper heater 12 and a lower heater 13 are arranged above and below, and a high frequency is supplied from above by a magnetron 14. In addition, the heating chamber 10 has an intake port 15 and an exhaust port 1.
6 is provided to perform forced intake and exhaust by the intake fan 17. Reference numeral 18 denotes a temperature detecting means.

FIG. 3 is a circuit diagram of a high-frequency heating device showing a first embodiment of the present invention. The upper heater 12 and the lower heater 13 respond to a temperature signal from the temperature detecting means 18,
The control unit 9 always controls the heating chamber temperature to the preheating temperature. When the cooking operation is started, the high-frequency generator 19 starts operating, and ends the cooking when a time set in advance for each type of food has passed while raising the temperature of the heating cabinet to the cooking operation temperature. After the cooking is completed, the temperature of the heating chamber is cooled to the preheating temperature by the intake fan 17. The bidirectional control rectifiers 12a and 13a have a function of adjusting the balance between the upper and lower heaters 12 and 13 in accordance with the type of food, as well as merely intermittently by the signal of the temperature detecting means 18. Similarly, the bidirectional control rectifying element 19a not only synchronizes with the cooking operation, but also has a function of maintaining a balance between heater heating and high-frequency heating according to the type of food.
20 and 21 are latch switches linked to the door 8, 2
2 is a short switch, and 23 is a cooling fan for cooling electric components.

FIG. 4 is a temperature characteristic curve of the temperature of the heating chamber of the high-frequency heating apparatus according to the first embodiment of the present invention. Specific temperature control during repeated cooking will be described with reference to FIG. This figure shows that a certain food has a preheating temperature of 250.
° C, cooking temperature 280 ° C, cooking time 50 seconds, cooking interval 30
7 is a graph showing the temperature in the heating chamber when cooking for two seconds is repeated. From the steady state of preheating, the door of the heating cabinet is opened, food is put in, the door is closed, and cooking is started. Since the heating chamber temperature does not reach the cooking temperature, the cooking is finished with the heater being continuously energized. The food is taken out, and for 30 seconds, the solid line indicates the case where cooling is performed by the intake fan, and the dotted line indicates the case where cooling is not performed. When cooling,
Repeat the same heating pattern from cooking to cooking,
It turns out that the workmanship of cooking is stable. However, when the cooling is not performed as shown by the dotted line, the cooking is more overheated than the cooking, and the cooking is overheated more than the cooking. Further, in the cooking, the temperature in the heating chamber reaches the cooking temperature. As a result, the heater is turned off, and as a result, the food does not burn even though the cooking is too much.

As described above, according to the configuration of the first embodiment,
In the case of repeated cooking, it is possible to improve cooking stability and increase the frequency of cooking.

In this embodiment, the heating chamber is provided with an intake port and an exhaust port and is cooled by an intake fan. However, only an exhaust port is provided and hot air in the heating chamber is discharged by an exhaust fan. The same effect can be obtained by the method, and the effect that hot air does not blow out to the front when the door is opened can be obtained at the same time.

(Embodiment 2) FIG. 5 is a detailed view of a display unit 9a of a control unit 9 of a high-frequency heating apparatus according to a second embodiment of the present invention.

In FIG. 5, a temperature display 24 displays a set preheating temperature during the preheating operation and a set cooking temperature during the cooking operation. The preheating display 25 blinks when the preheating operation is in the steady state, blinks the over display 26 when the heating chamber temperature exceeds the steady state, and blinks the under display 27 when the heating chamber temperature is less than the steady state. The output display 28 displays a preset high-frequency output intensity.

The relationship between the temperature characteristic curve of the cooking example of FIG. 4 and the display contents of FIG. 5 will be described below.

When the preheating operation is in a steady state, that is, when the temperature of the heating chamber is within a range of 250 ± 10 ° C., the preheating display 25 flashes. In this state, when the door is opened and closed to enter the cooking operation, the temperature of the heating chamber temporarily drops, but the mask is masked for a predetermined time, so that the preheating display 25 keeps blinking. When the cooking operation starts, the preheating display 25 is turned off, the temperature display 24 indicates 280 ° C., and the output display 28 blinks. When the cooking operation is completed, if the heating chamber temperature exceeds the preheating operation temperature, the over display 26 flashes, and the next cooking can be stably performed, that is, the cooking interval is set until the preheating display 25 starts flashing. Call attention to open. Conversely, when the food is taken out, if the temperature of the heating chamber is too low, for example, by leaving the door open and the like, the under display 28 blinks to display the same display.

With the above-described configuration, not only can the state of the heating chamber be clear at a glance, but also cooking can be stably repeated.

Further, as a method of increasing the cooking frequency, not only the case where the temperature exceeds 260 ± 10 ° C. is over, and the case where the temperature is less than 260 ± 10 ° C. is under, but depending on the type of food, the cooking time and the high frequency output are adjusted. , Over or under, there are cases where cooking is possible.

In FIG. 4, 260 ° C. to 270 ° C. indicates an over-cookable range, and 230 ° C. to 240 ° C. indicates an under-cookable range. In the cooking range on the over side, the cooking time is reduced by 10% and the high frequency output is increased by 10%. Conversely, in the under-cookable range, the cooking time is extended by 10% and the high-frequency output is reduced by 10%. Depending on the type of food, this adjustment results in almost the same finished state, and by programming this in advance, the cooking frequency can be further improved.

In FIG. 5, the over-cookable range is displayed by simultaneous blinking of the preheat display 25 and the over-display 26, and the under-cookable range is displayed by simultaneous blinking of the pre-heat display 25 and the under display 27. By doing so, a more detailed state of the heating chamber temperature can be notified. Along with this, by providing a strong key / weak key (not shown) and the like in the operation unit, it is possible to easily carry out the manual operation and obtain the same effect as described above. .

[0025]

As described above, according to the first to third aspects of the present invention, in the case of repeated cooking, the finished state of the food can be stabilized, the frequency of repetition can be increased, and the preheated state can be achieved. Power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram of a high-frequency heating device according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a temperature characteristic curve of a heating chamber of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 5 is a detailed view showing a display unit of the high-frequency heating device according to the second embodiment of the present invention.

FIG. 6 is a front view of a conventional high-frequency heating device.

[Explanation of symbols]

 Reference Signs List 9 control unit 9a display unit 10 heating chamber 12 upper heater 13 lower heater 14 magnetron 15 intake port 16 exhaust port 17 intake fan 18 temperature detecting means 25 preheat display 26 over display 27 under display

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K086 AA08 BA02 BA08 BB02 CA03 CB04 CC03 3L086 AA02 CA04 CA16 CC05 DA07 DA27 3L087 AA05 BA03 BB07 BC05 BC14 DA27

Claims (3)

[Claims] 1. A heating cabinet, high-frequency generating means coupled to the heating cabinet, heater heating means located at an upper portion and a lower portion in the heating cabinet, and intake and exhaust for forcibly taking in or exhausting the heating cabinet. Means, temperature detecting means for detecting a temperature in the heating chamber, and control means for controlling the temperature of the heating chamber by the temperature detecting means, wherein the control means always performs a preheating operation of the heating chamber for preheating. While maintaining the temperature, when cooking food, switch to the cooking operation in which the temperature is set higher than the temperature during the preheating operation, and after the cooking is completed, operate the intake / exhaust means to quickly recover the heating chamber temperature to the preheating temperature. A high-frequency heating device configured to perform the heating. 2. A preheating completion display indicating that the heating chamber is maintaining the preheating temperature, an under display indicating that the preheating temperature has not been reached, and an indication that the preheating temperature has been exceeded. The high-frequency heating device according to claim 1, further comprising an over-display. 3. The high-frequency heating apparatus according to claim 2, wherein the control means is configured to increase or decrease a preset cooking time of the food based on the temperature information detected by the heating chamber temperature detecting means.