JPH0835665A - High frequency heater - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a high-frequency heater with a menu key that has high accuracy in food discrimination and can be heated in an optimal heating time according to food. [Configuration] Based on the information of the humidity sensor 7 and the gas sensor 8, the change of the humidity sensor 7 and the food that finishes heating in a heating time according to the weight of the food until the change amount of the humidity sensor 7 reaches a predetermined value The food 1 is heated by discriminating between at least three foods, which finish heating at almost the same time when the amount reaches a predetermined value, and foods which are additionally heated for a predetermined time after the change amount of the humidity sensor 7 reaches a predetermined value. To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heater capable of discriminating the type of food and heating the food to an optimum finishing temperature.

[0002]

2. Description of the Related Art In a conventional high-frequency heater, automatic cooking has been put into practical use, which finishes at an optimum temperature without setting a heating time by using a sensor technology, and the usability has been greatly improved. It was Further, by making full use of sensor technology, as described in Japanese Patent Laid-Open No. 62-123226, the type of food is discriminated by using an alcohol sensor and a humidity sensor, and one key operation is performed for warming liquor having different finishing temperatures and general food. We are trying to improve the operability by trying to finish at the optimum temperature with. The conventional example will be described with reference to the drawings. FIG. 3 shows the changes over time in the outputs of the alcohol sensor and the humidity sensor when warming liquor, and FIG. 4 shows the changes over time in the outputs of the alcohol sensor and the humidity sensor when heating general food. is there.
As shown in FIG. 3, the value of the humidity sensor hardly changes, and the value of the alcohol sensor changes as shown in FIG. 3. If the difference between the output change values reaches a predetermined value or more after 16 seconds, the alcohol is warmed. It is determined that there is. For general food, as shown in FIG. 4, the value of the humidity sensor and the value of the alcohol sensor change similarly, and there is almost no difference between the values. In this case, it is determined that the food is a general food. When it is determined that the alcohol is warmed, the heating time is determined based on the signal detected by the weight sensor, and the electricity is supplied. If it is determined as a general food, it is heated by normal sensor control.

[0003]

However, in this configuration, it is discriminated whether alcohol or general food is based on whether the difference between the change values of the humidity sensor and the alcohol sensor exceeds a predetermined value. There are many foods that are cooked by adding alcohol, and paying attention only to the difference between the change values of the humidity sensor and the alcohol sensor, there is a risk of misidentifying general foods as sake, and the cooking result is poor. There is a drawback that

Generally, in high-frequency heating, solids such as rice are sufficiently warmed up when humidity is generated, but liquids such as stews have the property of being lukewarm when humidity is generated. However, there is a drawback in that a good cooked finished state cannot be obtained only by uniformly heating ordinary foods under normal sensor control.

Therefore, it is a first object of the present invention to provide a high-frequency heater which improves the accuracy of food discrimination and enables optimum heating control according to the food.

A second object is to set a predetermined amount of food after the amount of change in the humidity sensor reaches a predetermined threshold value, and to finish heating at about the same time. A first object of the present invention is to provide a high-frequency heater capable of distinguishing between foods for which additional heating is to be performed and performing optimum heating control according to the foods.

A third object is to provide a high-frequency heater capable of heating rice and milk to optimum temperatures.

A fourth object is to provide a high-frequency heater capable of discriminating between alcoholic beverages and prepared foods and heating them to an optimum temperature.

A fifth object of the present invention is to provide a high-frequency heater which improves the accuracy of food discrimination by a gas sensor and a humidity sensor and which can be heated to an optimum temperature.

[0010]

In order to achieve the first object, a high-frequency heater according to the present invention mainly comprises a heating chamber for storing food, a high-frequency heating means for heating the food in the heating chamber, and Humidity sensor to detect humidity, a gas sensor mainly to detect gases other than humidity, food weight detection means to detect food weight, heating time to control heating time based on the information of the humidity sensor and gas sensor Equipped with a control means, the food which finishes heating in a heating time according to the weight of food until the change amount of the humidity sensor reaches a predetermined value, and when the change amount of the humidity sensor reaches a predetermined value, the heating is performed almost at the same time. The food to be finished and the food to be additionally heated for a predetermined time after the change amount of the humidity sensor reaches a predetermined value are discriminated into at least three and optimal heating control is performed according to the food.

In order to achieve the above second object, it is detected that the amount of change of the gas sensor has reached a predetermined threshold value, and when the amount of change of the humidity sensor has reached a predetermined threshold value, heating is performed almost at the same time. At least two of the food to be finished and the food to be subjected to additional heating for a predetermined time after the change amount of the humidity sensor reaches a predetermined threshold are determined to be heated.

In order to achieve the above third object, milk,
The heating of the rice is configured so that the heating is ended almost at the same time when the change amount of the humidity sensor reaches a predetermined threshold value.

In order to achieve the fourth object, the heating is finished in a heating time corresponding to the weight of the food by the amount of gas change immediately after the start of heating until the amount of change of the humidity sensor reaches a predetermined threshold value. At least two of the food and the food to be additionally heated for a predetermined time after the change amount of the humidity sensor reaches a predetermined threshold value are determined to be heated.

In order to achieve the above fifth object, it is detected that the change amount of the gas sensor has reached a predetermined threshold value, and the weight of the food is measured before the change amount of the humidity sensor reaches the predetermined threshold value. With food that finishes heating in a corresponding heating time,
At least three items: food that ends heating at about the same time when the amount of change in the humidity sensor reaches a specified threshold value, and food that is additionally heated for a specified time after the amount of change in the humidity sensor reaches the specified threshold value. And the threshold of the gas sensor is a function of the threshold of the humidity sensor.

[0015]

The high-frequency heater of the present invention has at least the above-mentioned first configuration, distinguishes between at least three food items, and can perform optimum heating control for each food item, thus providing a good cooking finish.

Further, the high-frequency heater having the above-mentioned second structure can discriminate food from the amount of change in gas.

Further, the high-frequency heater having the above-mentioned third structure can optimize the finishing temperature of milk and rice.

Further, the high-frequency heater of the fourth construction enables discrimination between alcoholic beverages and side dishes. In addition, the high-frequency heater having the fifth configuration improves food product discrimination accuracy.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A high frequency heater according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of the high-frequency heater according to the present invention. A magnetron 3 is connected to a heating chamber 2 for accommodating a food 1 and driven by a high-voltage power supply device 4. The steam, gas, etc. generated in the heating chamber 2 are exhausted from the exhaust port 5.
An exhaust duct 6 is coupled to the exhaust port 5, and a humidity sensor 7 that mainly detects humidity and a gas sensor 8 that mainly detects components such as alcohol and odor are provided inside the exhaust duct 6. The loading plate 9 on which the food 1 is placed is the weight sensor 1
It is tied to zero. The operation section 11 for instructing heating to the high-frequency heater of the present invention includes a warming key 12 for warming sake, milk, rice, and prepared foods, and a defrosting key 13 for instructing thawing of frozen meat, fish, etc. A start key 14 for instructing the start of heating and a display unit 15 for displaying the remaining heating time are provided. The operation unit 11, the humidity sensor 7, the gas sensor 8, and the weight sensor 10 are connected to a heating time control unit 16 configured by an electronic circuit including a microcomputer, information of each sensor is input, and a preset algorithm is set. Accordingly, the high voltage power supply device 4 is controlled.

The automatic cooking operation of the warming key of the high-frequency heater according to the present invention will be described with reference to the flowchart of FIG. 2 showing an algorithm.

When the warm key is selected and the start key is input, the food weight is measured in step S1. S
High-frequency heating is started in two steps, and waits for the time Tgi to elapse in step S3. After Tgi, in S4 step
The change amount Δg of the gas sensor 8 after the passage of Tgi is substituted for gi. As a result, it is examined whether or not alcohol is generated in a state where the food just after heating is not accumulated. For alcohol warming and the like, gi has a large value because the alcohol evaporates even at room temperature, whereas for cooked side dishes, gi has a small value because the alcohol and other volatile components are small. In step S5, it is checked whether the variation amount Δg of the gas sensor exceeds the threshold value G2 and whether or not gas is detected. In step S6, it is checked whether or not the amount of change Δh of the humidity sensor 7 exceeds the threshold value H1 to check whether or not the humidity is detected. Waiting for either gas detection or humidity detection to occur while cycling through steps S5 and S6. If the threshold value H1 of the humidity sensor is a function function of the food weight or the initial temperature in the heating chamber, the finished state of the food can be accurately detected. At this time, in order to judge the amount of gas generated from the food, it is desirable to compare the gas amounts in the same finished state. Therefore, G2 is a function of H1. When the gas detection in step S5 occurs first, it is checked in step S7 whether gi captured in step S4 exceeds the threshold value G3. If gi> G3, alcohol is often generated immediately after the start of heating, so it is determined that alcohol is warmed. In step S8, the heating time Tos is calculated based on the food weight w measured in step S2. In step S9, waiting for the time Tos to elapse, and if the time elapses, the heating is finished. In the case of warming alcoholic beverages, a large amount of alcohol is generated before the generation of humidity, and therefore it can be determined by the steps described above.

If gi≤G3 in step S7,
Judging that it is a side dish or frozen food, not warming alcohol,
In step S10, the change amount Δh of the humidity sensor 7 is the threshold value.
It is checked if H2 is not exceeded and the step S10 is repeated until the humidity is detected. When the temperature of the food increases and steam is generated from the food and the change amount Δh of the humidity sensor 7 becomes Δh> H2, it is determined that the humidity is detected, the detection time is set to T1, and the process proceeds to step S11. In step S11, the detection time T1 and the reference value
If T1> Tdh1 compared to Tdh1, it is judged as frozen food, and T
If 1 ≦ Tdh1, it is determined that the dish is not frozen. Tdh1 is a function of food weight, and the value obtained from the experiment in advance is set. Frozen foods are frozen and are less likely to warm up than side dishes at room temperature, so the detection time T1 is significantly longer, and frozen foods can be identified. If it is a frozen food, the high frequency output is changed to a weak output in step S12, and the additional heating required by Kd · T1 is performed in step S13 to finish the heating. If frozen food is continuously heated at high output, the temperature difference between the center and the surroundings of the food tends to become large. Therefore, change to weak output and heat while averaging the temperature rise. If it is determined that the dish is a side dish in step S11, the process proceeds to step S14, additional heating of K · T1 is performed, and heating is finished. Before the entire side dish is heated, steam is likely to be generated due to local heating, and it is not sufficiently warm when the humidity is detected. Therefore, additional heating needs to be performed in this way.

While cycling through S5 and S6 steps,
When the humidity detection in step S6 occurs first, the process proceeds to step S15, and the gas change Δg at step S6 is Δg>
If it is G1, the process proceeds to step S10, where it is determined to be a side dish or frozen food, and it is heated as described above. G1 and G2
The same as H. If Δg ≦ G1, rice,
The heating is stopped as soon as it is judged that the milk is warm. The optimum temperature for rice is 80-90 ° C, while the optimum temperature for milk is 55-60 ° C, which is significantly different, but 80% for rice.
Steam does not come out until it reaches ~ 90 ° C, whereas milk has
Since steam is generated at a lower temperature, rice and milk can be heated to an appropriate temperature by detecting the generation of steam. Further, rice and milk do not contain a substance with which the gas sensor reacts, and can be distinguished from side dishes.

[0025]

As described above, according to the heating cooker of the present invention, the food which finishes the heating in the heating time corresponding to the weight of the food until the change amount of the humidity sensor reaches a predetermined value, and the humidity sensor At least three types of food are to be heated, that is, food that ends heating almost at the same time when the amount of change reaches a predetermined value and food that additionally heats for a predetermined time after the amount of change of the humidity sensor reaches a predetermined value. This makes it possible to optimally heat each food item and improve the cooking finish.

Further, it is possible to discriminate between milk, rice and prepared foods based on the amount of change in gas. Also, you can optimize the finishing temperature of milk and rice.

Further, it becomes possible to distinguish between alcoholic beverages and side dishes. Further, even if the amount of food or the state of the heating chamber changes, the accuracy of food discrimination is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a high-frequency heater according to the present invention.

FIG. 2 is a flowchart of a program of a microcomputer of the high-frequency heater according to the present invention.

FIG. 3 is a diagram showing an output of a sensor when liquor is heated in a conventional high-frequency heater.

FIG. 4 is a diagram showing an output of a sensor when heating general food in a conventional high-frequency heater.

[Explanation of symbols]

 1 Food 2 Heating Chamber 3 Magnetron (High Frequency Heating Means) 7 Humidity Sensor 8 Gas Sensor 10 Weight Sensor (Food Gravity Detecting Means) 11 Operation Section 16 Heating Time Control Section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H05B 6/68 N 7361-3K R 7361-3K (72) Inventor Rie Murata Osaka Prefecture Kadoma City Kadoma Shinma 1006 Matsushita Electric Industrial Co., Ltd. (72) Inventor Tomomi Uchiyama Kadoma, Osaka Prefecture 1006 Kadoma Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A heating chamber for accommodating food, a high-frequency heating means for heating food in the heating chamber, a humidity sensor for detecting humidity, a gas sensor for detecting gas, and a food weight detecting means for detecting food weight. And a heating time control means for controlling a heating time based on the information of the humidity sensor and the gas sensor, and an operation unit for instructing heating, and the weight of the food by the amount of change of the humidity sensor reaches a predetermined threshold value. The food that finishes heating in a heating time according to the above, the food that finishes heating at about the same time when the change amount of the humidity sensor reaches a predetermined threshold value, and the change amount of the humidity sensor reaches the predetermined threshold value. After that, it is configured to heat the food by discriminating into at least three of the foods to be additionally heated for a predetermined time, and the operation portion is provided with at least one operation switch capable of warming alcohol, milk, rice, and prepared foods. Frequency heating device. 2. A heating chamber for containing food, a high-frequency heating means for heating the food in the heating chamber, a humidity sensor for detecting humidity, a gas sensor for detecting gas, and a food weight detecting means for detecting food weight. And a heating time control means for controlling the heating time based on the information of the humidity sensor and the gas sensor, and an operation section for instructing heating, and detects that the amount of change of the gas sensor has reached a predetermined threshold value. , At least two of the food that finishes heating at about the same time when the change amount of the humidity sensor reaches a predetermined threshold value and the food that additionally heats for a predetermined time after the change amount of the humidity sensor reaches the predetermined threshold value. A high-frequency heater having a structure for heating food by distinguishing between the two, and having at least one operation switch capable of warming at least alcohol, milk, rice, and prepared foods in the operation section. 3. A heating chamber for containing food, a high frequency heating means for heating the food in the heating chamber, a humidity sensor for detecting humidity, a gas sensor for detecting gas, and a food weight detecting means for detecting food weight. And a heating time control means for controlling the heating time based on the information of the humidity sensor and the gas sensor, and an operation unit for instructing the heating, and the amount of change of the humidity sensor for heating milk and rice is a predetermined threshold value. A high-frequency heater equipped with one operation switch capable of heating at least liquor, milk, rice, and prepared foods in the operation section when heating is completed almost at the same time. 4. A heating chamber for containing food, a high frequency heating means for heating food in the heating chamber, a humidity sensor for detecting humidity, a gas sensor for detecting gas, and a food weight detecting means for detecting food weight. And a heating time control means for controlling a heating time based on the information of the humidity sensor and the gas sensor, and an operation unit for instructing heating, and the amount of change of the humidity sensor is determined by the amount of gas change immediately after the start of heating. At least two: food that finishes heating with a heating time according to the weight of food before reaching the threshold value, and food that performs additional heating for a predetermined time after the change amount of the humidity sensor reaches a predetermined threshold value. A high-frequency heater having a configuration for discriminating and heating food, and having at least one operation switch capable of heating at least alcohol, milk, rice, and prepared foods in the operation section. 5. A heating chamber for accommodating food, a high frequency heating means for heating the food in the heating chamber, a humidity sensor for detecting humidity, a gas sensor for detecting gas, and a food weight detecting means for detecting food weight. And a heating time control means for controlling the heating time based on the information of the humidity sensor and the gas sensor, and an operation section for instructing heating, and detects that the amount of change of the gas sensor has reached a predetermined threshold value. , When the change amount of the humidity sensor reaches the specified threshold value, the heating is finished in the heating time according to the food weight, and when the change amount of the humidity sensor reaches the specified threshold value, the heating is finished almost at the same time. To determine at least three of the food to be subjected to additional heating for a predetermined time after the change amount of the humidity sensor reaches a predetermined threshold value, and the threshold value of the gas sensor is the threshold value of the humidity sensor. Seki And composed of a high frequency heater to the operating part having a single operation switch at least capable liquor, milk, rice, is warmed in prepared foods.