JPH0311371B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a high-frequency heating device equipped with a gas sensor, and is particularly suitable for automatically heating objects that require delicate heating such as chawanmushi, milk, and sake cans. Concerning things that can be cooked.

Conventional configurations and their problems Conventional high-frequency heating devices that use gas sensors to automatically cook foods that require delicate heat control, such as chawan mushi, milk, and sake can, have not been widely put into practical use. ing. However, all of these foods are difficult to prepare without failure. If you don't detect the minute amount of steam when the egg mixture begins to coagulate in chawanmushi, it will overcook and quickly become contaminated with soot. Milk and sake cans have a low finishing temperature, and are therefore prone to overheating unless trace amounts of steam and alcohol are reliably removed.

FIG. 3 is a heating pattern showing a conventional example of chawan mushi. In order to achieve such delicate heat control, the heating is divided into two stages. Pre-heating that heats at high output for a certain amount of time depending on the amount,
This is finish heating, in which heating is performed slowly at low output and the finish is detected by a gas sensor.

Preheating is a stage in which the temperature of the egg mixture and ingredients for chawanmushi is raised in a short period of time, and is terminated before the egg mixture begins to coagulate. This stage allows for rough heating, is provided to shorten the total cooking time, and does not use a sensor. Preheating time
T _P is determined according to the quantity, and the quantity is entered manually. This pre-heating time T _P is counted by a timer.

During the subsequent finishing heating, the microwave output is intermittent, and the heating progresses 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, automatically calculates the heating time T _F , and finishes cooking. At this time, the magnetron, which is the high frequency generation means, is cooled,
In addition, the fan that ventilates the heating chamber generally operates during heating.

The problem with conventional automatic cooking of chawan mushi is that the smaller the amount, the more likely it is to overheat, and it is difficult to prevent the steaming from boiling in one bowl. In other words, in chawanmushi, where the point at which a small amount of steam is generated must be detected, the total weight of the steam generated in one bowl is small, and the heating progresses during the slight detection delay, causing the steam to enter the bowl. The workmanship tends to be unsatisfactory.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and dramatically increases the detection sensitivity of the sensor, not only for steaming steamed eggs but also for automatic cooking of heated items such as milk and sake cans that require delicate heating. The purpose is to increase.

Structure of the Invention In order to achieve the above object, the high-frequency heating device of the present invention is equipped with a gas sensor that detects water vapor and gas generated from the object to be heated, and is equipped with a gas sensor that detects water vapor and gas generated from an object to be heated, and a fan serving as a ventilation means is used to operate the microwave intermittently. It is configured to turn on with a delay and perform intermittent control while synchronizing both while keeping the on time shorter than the on time of the microwave.It increases the detection sensitivity of the gas sensor and is suitable for heating objects that require delicate heating. Optimum heating can be automatically performed for each.

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 pivotally supported on the front surface of the main body 1 so as to be freely openable and closable, and an operation panel 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. As shown in the figure, various menus are arranged as the auto keys 4, and the steamed egg custard key 5 is also provided as one of these auto keys. In addition, milk and liquor bottles are also placed as auto keys as shown in the diagram.

FIG. 4 is a heating pattern for chawanmushi showing one embodiment of the present invention. As before, the heating pattern consists of two stages: pre-heating T _P and finishing heating _F. What is different from the conventional method is the intermittent use of a fan, which is a means of ventilation during finishing heating.

FIG. 5 is a detailed diagram showing the timing of the microwave output and fan on/off during such finishing heating.

As shown in the figure, the timings of the microwave and the fan are slightly shifted. That is, the fan operates after a delay time t ₃ with respect to the on-time t ₁ and off-time t ₂ of the microwave, and the on-time t ₄ is shorter than the on-time t ₁ of the microwave.
One cycle of the fan on and off is equivalent to that of the microwave.

Now, when the magnetron is turned on, microwaves are not irradiated for several seconds until the cathode is sufficiently heated, so even if the fan is stopped during this time, there will be no damage to the magnetron, and the fan will not be irradiated with microwaves. It is possible to turn on the magnetron with a delay of a certain predetermined time t ₃ from the time it is turned on, and to make the on time t ₄ shorter than the magnetron's on time t ₁ . With this control, the steam generated by carryover heating (uneven heating) while the microwave output is turned off is stored in the heating chamber without being ventilated, and the time the fan is on is suppressed to the utmost. ing. Therefore, the next time the fan is turned on together with the microwave, the stored steam reaches the gas sensor at once, and the absolute humidity exhibits a pulsating phenomenon as shown in FIG. 4 (S). Therefore, the vapor sensitivity of the gas sensor can be increased compared to the conventional one shown in FIG. In other words, the steam that was conventionally emitted when the microwave was turned off can be stored, and the differential detection sensitivity can be improved to an integral value sensitivity. To give an example, conventionally it took 5 minutes and 40 seconds to detect one bowl, but with the present invention it takes 5 minutes at the same detection level.
It was hot in 10 seconds. In other words, it can be said that this difference is due to improved sensitivity.

The above heating pattern prevents small amounts of chawan mushi from standing up, and if applied to low-temperature cooking of milk and sake, it is possible to reliably capture trace amounts of steam and gas, suppressing overheating and cooking properly. Cooking becomes possible.

Next, the configuration of such a high frequency heating device will be explained. In FIG. 6, an automatic cooking command input from the auto key 4 on the operation panel 3 is sent to the control unit 6.
deciphered by. If the chawan mushi key is pressed at this time, the control section 6 starts heating the chawan mushi, which is the object to be heated 8 placed in the heating chamber 7 . The heating is controlled by supplying power to a magnetron, which is a high frequency generating means 10, through a driver 9. Ventilation means 1
One fan cools the magnetron, ventilates the inside of the heating chamber 7, and discharges ventilation air to the outside of the aircraft through an exhaust guide 12. A gas sensor 13 is disposed within this exhaust guide 12, and a detection circuit 14
The amount of steam and gas generated from the object to be heated 8 is transmitted to the control section 6 via the control section 6. In the finishing heating mode, the control unit 6 uses this gas sensor 13 to detect the completion point of heating and automatically ends the cooking.

Note that the mounting plate 14 is rotationally driven by a motor 15, and uneven baking during microwave heating is improved.

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

(1) Detection sensitivity can be dramatically increased for heated objects such as steamed egg custard, milk, and sake cans that require detection of trace amounts of steam and gas. In particular, small amounts of overheating can be significantly improved.

(2) Since the ventilation air is stopped when the microwave is turned off, the object to be heated is not cooled, so carryover heating (uneven heating) can be performed effectively and heating time can be shortened.

(3) The on-time of ventilation air is reduced to less than half of the conventional time.
Drying of the surface of the heated object can be significantly improved.

[Brief explanation of the drawing]

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 operation panel,
Fig. 3 is a diagram showing the heating pattern of conventional chawanmushi, Fig. 4 is a diagram showing the heating pattern of chawanmushi according to an embodiment of the present invention, Fig. 5 is a detailed diagram of the finishing heating, and Fig. 6 is a diagram showing the heating pattern of chawanmushi according to an embodiment of the present invention. FIG. 1 is a block diagram of a configuration showing an embodiment of the invention. 6... Control unit, 7... Heating chamber, 8... Heated object, 10... High frequency generation means, 11... Ventilation means, 13... Gas sensor.

Claims (1)

[Claims] 1. A heating chamber in which an object to be heated is placed, a high frequency generation means coupled to this heating chamber, a ventilation means to ventilate the heating chamber, and a gas sensor that detects water vapor or gas generated from the object to be heated; comprising a control section that controls power supply to the high frequency generating means,
The control section causes the high frequency generation means to operate intermittently for at least a certain period of time, detects water vapor or gas generated from the heated object using the gas sensor during the intermittent operation, and controls the ventilation means so that the high frequency generation means A high-frequency heating device that is turned on with a delay of a certain predetermined time from the time when it is turned on, and is controlled so that the on-time is shorter than the on-time of the high-frequency generating means.