JPS60165427A - High-frequency heating appliance - Google Patents

Abstract

PURPOSE:To make it possible to automatically select an optimum heating pattern from the total weight including a vessel for a pot-hotchpotch (Chawanmushi) by providing in the titled uit a weight sensor for detecting the weight of a material to be heated and a gas sensor detecting steam and gas generated from the material to be heated. CONSTITUTION:When a heating time TP and a detection threshold value DELTAh are calculated based on the weight measurement, a control part 7 starts to supply power to a magnetron which is means 14 for generating a high-frequency through a driver 13. A blower 15 cools the magnetron and, at the same time, carries out ventilation ithin a heating chamber 10, exhausting ventilation air out of the unit through an exhaust guide 16. A gas sensor 17 is disposed within the exhaust guide 16, and transmits steam and gas generated from a material 9 to be heated to the control part 7 through a detection circuit 18. When the operation mode is shifted to a finishing and heating mode, the control part 7 detects a point in time of completion of heating, that is, a point in time exceeding the detection threshold value h, thus automatically terminating the cooking.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a high-frequency heating device equipped with a weight sensor, and in particular is configured to estimate the number of chawanmushi from the total weight including the container and correct the heating pattern. Regarding.

Conventional Structure and Problems Conventionally, high-frequency heating devices configured to automatically cook chawanmushi using a gas sensor have been widely used. For example, automatic cooking of chawan mushi is implemented in a microwave oven equipped with a humidity sensor or a gas sensor that detects water vapor and various gases generated from the heated object.

Chawanmushi is a delicate process that requires careful control of the heat, making it difficult to automate. If the heat is even slightly too high, the liquid will start to ooze out, and on the other hand, if it is not heated, the liquid will not solidify and the result will be loose.

In conventional chawanmushi, multiple chawanmushi keys are provided, and the heating sequence is divided according to the quantity (number of pieces).9 After pressing a single chawanmushi key, the number of pieces is set by turning a timer knob. By manually inputting the number of pieces in this way, it was possible to select an appropriate heating pattern and achieve delicate heat control.

FIG. 3 shows an example of the heating pattern for conventional chawan mushi, where A is a heating pattern for one bowl and B is a heating pattern for four bowls.
The gas sensor can detect at least the amount of water vapor (absolute humidity) generated from the heated object.

The heating pattern consists of two stages: pre-heating T in which heating is performed at high output for a certain period of time, and finishing heating TF in which heating is progressed slowly at low output and finishing is detected by a sensor. Preheating is a stage in which the temperature of the chawanmushi liquid and ingredients is raised in a short period of time, and is terminated before the egg mixture begins to coagulate. This stage only requires rough heating, is provided to shorten the total cooking time, and does not use a sensor. It is heated for a certain amount of time depending on the quantity. One bowl A is heated by T, and four bowls B are heated by Tp4, and this time is counted by a timer.

During the subsequent finishing heating, the microwave output is intermittent, and heating proceeds slowly at low output. At this point, the egg fluid reaches its freezing point and steam begins to be generated. The gas sensor detects this steam generation Δh and automatically ends the heating. Here, the microwave output is controlled to be low when steaming a small amount of chawanmushi, that is, the on time is controlled to be short. This is to prevent a small amount, such as one bowl, from being easily overheated and resulting in soot.

Now, the problem with the conventional automatic cooking of chawan mushi as described above is that first of all, the number of pieces must be set manually. The operation is cumbersome and can easily lead to user misuse. Second, the contents of the same bowl vary depending on the container. Therefore, the pre-heating time T has to be kept modest, and the total cooking time becomes extremely long for large containers.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a high-rise wave heating device that eliminates the need to set the number of chawanmushi and allows selection of the optimal pre-heating time T even if the size of the container changes. purpose.

Structure of the Invention In order to achieve the above object, the high frequency heating device of the present invention is equipped with a weight sensor that detects the weight of the object to be heated and a gas sensor that detects water vapor and gas generated from the object to be heated. It is configured to automatically select the optimal heating pattern based on the total weight including the container, making it easy to operate and automatically performing optimal heating.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is a perspective view of a high-frequency heating device according to the present invention.

A door body 2 is provided on the front surface of the main body 1 so as to be openable and closable, and an operating spring /I/3 is arranged. An auto key 4 is provided on the operation panel 3, allowing the user to automatically cook a desired menu.

FIG. 2 is a detailed view of the main parts of such an operation panel.

The various menus shown in the figure are arranged as the auto keys 4, and the steamed egg custard key 5 is also provided as one of these auto keys.

6 is a timer knob, which is used to set the heating time during manual heating. Conventionally, as described above, after pressing the steamed egg custard key 5, the timer knob 6 was turned to input the number of pieces. According to the present invention, such an operation for setting the number of pieces is no longer necessary, and by simply pressing the chawanmushi key 5, chawanmushi can be automatically cooked in an optimal heating pattern.

FIG. 4 is a heating pattern for chawanmushi showing one embodiment of the present invention. The sensors include a weight sensor and a gas sensor, and the heating pattern consists of two stages, pre-heating and final heating, as in the past. The difference from the conventional method is that the pre-heating time Tp is made a function of weight, and the detection threshold value Δh of the gas sensor in finishing heating is made a function of weight.

The difference between the method of setting the preheating time T based on weight and the conventional method of setting it from the number of pieces input manually will be explained. FIG. 5 is a diagram showing the relationship between the total weight of one bowl and the content when trying to make chawanmushi in various containers. The content, that is, the amount of egg liquid, is what happens when you pour the appropriate amount into the container, approximately the equivalent of a third. From this diagram, it can be seen that even though the size and weight of the containers vary, there is a strong correlation between the total weight and the content, and it can be approximated by a linear straight line.

In other words, the conventional manual number setting cannot take into account the difference in content due to differences in containers, so the preheating time T cannot be selected optimally. . Furthermore, the fact that the content can be estimated from the total weight means that there is no need to perform a tare operation in which only the weight of the container is subtracted, which further simplifies the operation.

Next, the effect of making the detection threshold value Δh a function of weight will be explained. This is a method of correcting △h for a small quantity and making a large correction for a large quantity. For example, △h (W) = AW+
It is calculated using a formula such as B.

A and B are constants, and W is the total weight. Such threshold value correction can improve handling of quantity, prevent streaks in small quantities, and improve the tendency to finish loosely in large quantities.

Next, the configuration of such a high frequency heating device will be explained. In FIG. 6, an automatic cooking command inputted from the auto key 4 on the operating spring/I/3 is decoded by the control section 7. If the chawanmushi key is pressed at this time, the control section 7 uses the weight sensor 8 to measure the weight of the object to be heated 9, the dalchawanmushi. 10 is a heating chamber, and a mounting plate 11 is rotationally driven by a motor 2, thereby improving uneven baking during microwave heating. Here, the weight sensor 8 is a strain gauge, a capacitance rectangle detection method, or a vibration detection method that focuses on the fact that the natural frequency changes when the mounting plate 12 is vibrated depending on the weight of the object to be heated 9. can be used.

When the preheating time T and the detection threshold Δh are calculated based on the weight measurement, the control unit 7 controls the driver 3
Power is started to be supplied to Magne I-ron, which is the high frequency generating means 14, through the . The blower 15 cools the magnetron, ventilates the inside of the heating chamber 10, and exhausts ventilation air to the outside of the aircraft through an exhaust guide 16. The gas sensor 7 is disposed within the exhaust guide 16 and transmits the amount of steam and gas generated from the object to be heated 9 to the control section 7 via the detection circuit 18. When the control section 7 shifts to the finishing heating mode, the control section 7 uses the gas sensor 7 to detect the point at which the heating is completed, that is, the point at which the detection threshold value Δh is exceeded, and automatically ends the cooking.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) No need to manually set the number of chawanmushi.
The optimum heating pattern can be automatically selected using the quantity sensor.
Easy to operate.

(2) Even if the content of each bowl varies depending on the size of the chawanmushi container, the optimal pre-heating time is automatically calculated.

(3) Since the detection threshold value is weight-corrected, it is possible to correspond to the quantity, and it is possible to achieve a finish that is difficult to get in from small to large quantities, and is not too loose.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main body of a high-frequency heating device showing an embodiment of the present invention, Fig. 2 is a detailed view of the same operation panel, Fig. 3 is a drawing showing a conventional heating pattern for chawanmushi, and Fig. 4 is a diagram showing the main body of a high-frequency heating device according to an embodiment of the present invention. A heating pattern diagram for chawanmushi showing an embodiment of the invention, Figure 5 is a diagram showing the relationship between the total weight of the container and its content, and Figure 6 is
The figure is a block diagram of a configuration showing an embodiment of the present invention. 5...Chawanmushi key, 7...Dan/control section, 8
... Weight sensor, 9 ... Heated object, i
o... Heating chamber, 14...- High frequency generating means, 17... Gas sensor. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Figure 5 Figure 6rI! I

Claims (1)

[Claims] A heating chamber in which an object to be heated is placed, a high-frequency generating means coupled to the heating chamber, a weight sensor for detecting the weight of the object to be heated, and a sensor for detecting water vapor or GANU generated from the object to be heated. It consists of a gas sensor, a control unit that controls power supply to the high-frequency generating means, and a single chawanmushi key that instructs automatic cooking of chawanmushi, and the control unit is operated by pressing the chawanmushi key. A high-frequency heating device configured to use the weight detector to detect serious defects in the object to be heated, and correct the method of feeding power to the high-frequency generating means or the detection method of the support sensor accordingly.