JPS6237292B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a composite heating device that detects the opening/closing operation of a door body to estimate whether or not an object to be heated has been brought into the heating chamber, and according to the set heating mode. The present invention relates to a safety device that informs whether or not to bring in a heated object.

The operation mode of the heating device varies greatly depending on the heating source and heating method of the object to be heated.
In particular, we are concerned with the difference in operation between dry firing of the heating chamber (operation with no load) and when the door is opened during heating and then closed again.

First, we will talk about heating devices equipped with electric heaters, gas burners, etc. as heating sources, such as ovens and grills. These heat sources heat the object from the outside. Furthermore, these heating methods can be roughly divided into the following two types in terms of heating mechanism.

One is oven heating, in which the object to be heated is steam-baked at ambient temperature. This is a heating method in which direct radiant heat from a heating source is cut off, and the object to be heated is left in a high temperature environment to bake. In this case, it is necessary to raise the temperature in the heating chamber to a sufficiently high temperature before placing the object to be heated in the heating chamber. In other words, it is necessary to perform dry firing called preheating. If you neglect this, the cooking time will take longer and some dishes may fail.

The other type is grill heating, in which the object to be heated is grilled using radiant heat from a heating source. This bakes using infrared radiation from a heating source, so no preheating is necessary. If preheating is performed incorrectly, the temperature inside the heating chamber will become extremely high in a short period of time, which is dangerous. Also, the approximate heating time for grill heating is shown to the user without unnecessary preheating, so if you preheat, the grill will burn too much.

The above is a difference in the presence or absence of preheating, but there is another big difference in operation between oven heating and grill heating. The problem lies in restarting after opening the door during heating. Generally speaking, a sheathed heater with little radiation is used for oven heating, so the heater itself also takes some time to rise in temperature within the heating chamber. For this reason, once heating is started, power supply to the sheathed heater is often continued even if the door is opened midway through. Of course, the temperature will be adjusted. Therefore, in such a case, the user simply closes the door again and oven heating continues.

On the other hand, quartz tube heaters and special sheathed heaters that emit a lot of infrared radiation are used to heat the grill. The rise of the heater's own infrared radiation is good. Further, there is no need to maintain the temperature inside the heating chamber at a high temperature. To avoid the risk of burns, opening the door during heating will stop the power supply to the heater. Therefore, when restarting, there are many configurations in which the start button is pressed again.

Next, a heating device including a microwave generator such as a magnetron as a heating source, such as a microwave oven, will be mentioned. Microwave heating heats the inside and outside of the object at the same time and does not require preheating. If preheating (that is, dry firing) is performed by mistake, it will not burn too much like heating a grill, but the amount of leakage from the microwave body will increase during preheating, or local parts of the heating chamber This is extremely dangerous as it may overheat areas (areas with strong waves). It also damages the magnetron and significantly shortens its life. In other words, dry cooking in the microwave is strictly prohibited.

From the viewpoint of preventing dry heating, in a microwave oven, the start button must be pressed again each time the door is closed to restart heating.

As described above, the operation mode differs greatly depending on the heating source and heating method. Moreover, in recent years, the majority of demand has been for composite heating devices that integrate the heating methods of ovens, grills, and microwaves. The user must accurately memorize and execute completely different operations for each heating method. If you make a mistake in this operation, there is a potential danger that not only will heating fail, but you may also injure yourself or even cause a fire.

In view of this background, the present invention clearly shows the presence or absence of the object to be heated and the operation of the start button to the user, and indirectly indicates whether or not the object to be heated is placed by detecting the opening and closing of the door body. By making a specific estimation and advancing the heating sequence by one step, a heating device that can ensure safe operation is realized.

The configuration of the present invention will be explained below with reference to the drawings. FIG. 1 is a perspective view of the main body of a heating device showing an embodiment of the present invention. There is a door body 2 on the front of the main body 1 that can be opened and closed freely.
is pivotally supported, and an operation panel 3 is provided. A keyboard 4 for the user to issue various commands to the control unit, a display window 5 for displaying heating time, output, heating temperature, etc., and a sound groove 6 for outputting synthesized speech are arranged on the operation panel 3. has been done.

FIG. 2 is a block diagram showing the system configuration of such a heating device. On the keyboard 4, there are function keys such as oven, grill, microwave oven, etc. for selecting the output, time, temperature and heating method during manual heating, as well as numeric keys (1 to 0). Enter pattern data. Further, the auto key reads out the heating pattern data previously stored in the memory and instructs it to be transferred to a predetermined register. The start button commands the start of heating, and the clear key stops heating or cancels the program.

These keys are binary encoded by an encoder 7 and input to a microcomputer (hereinafter abbreviated as "microcomputer") 8 which is a main control section. A memory 9 is built into the microcomputer 8, and heating pattern data corresponding to the auto key is stored here.

On the other hand, an object to be heated 11 is placed in the heating chamber 10 and rotated by a rotary mounting table 12 and a motor 13 . A magnetron 14 for irradiating microwaves as a heating means, an upper heater 15 used for oven and grill heating, and a lower heater 16 for oven heating are coupled to the heating chamber 10. Reference numeral 17 denotes a driver including switching means such as a relay for supplying power to these heating means.

The opening/closing operation of the door body 2 is detected by a door switch 18 serving as a door opening/closing detection means, and is inputted to the microcomputer 8.

A display section 19 is one of the notification means, and is composed of a fluorescent display tube or the like. Heating pattern data such as heating time, output, and heating temperature is output from the microcomputer 8 and displayed here. 20 is a synthesizer forming a voice synthesis section which is another notification means, reads voice data from the voice memory 21, synthesizes the data, and outputs the synthesized voice from the speaker 22.

Now, a specific example in which heating is actually performed using the above configuration will be described with reference to FIG. First, to perform heating, program the heating pattern data using specified keys and knobs on the keyboard (1). At this time, the door body is normally closed. Once you have entered the heating pattern, a warning will be issued to prevent you from dry-frying ("Press the start button after adding food") since preheating is not necessary for grill heating and microwave heating. However, since oven heating requires preheating, a notification is sent to remind you not to forget to air-bake (``First, we will preheat. Please press the start button without adding anything.'').

Next, the user opens the door, places the object to be heated in the heating chamber, and then closes the door again. Therefore, the microcomputer can indirectly detect whether or not the object to be heated has been carried into the heating chamber by opening and closing the door (2).
It then advances one heating sequence and waits for the next time the start button is pressed. At the same time, a notification is issued to prompt the user to operate it (``Please press the start button''). This operation of the door body is not normally performed when heating the oven, but if it is done, there is a possibility that the object to be heated has been brought in by mistake, so a warning is given to perform the dry firing again. (Please press the start button without inserting anything.)

Next, the start button is pressed after the heated object has been brought in or removed as notified (3). Then, the microcomputer starts supplying power to each heating means and notifies the start of heating (as shown in the figure).

Note that if the start button is pressed without the condition 2, that is, without opening or closing the door, it is determined that dry baking has occurred, and power supply to the heating means is not started except for oven heating. Therefore, the risk of dry firing can be completely prevented. Note that the key operation 1 and the carrying-in of the heated object 2 may be reversed. At this time, since preparation for heating has not been completed at the time of delivery, no notification is given (see 6).

Next, suppose that the door body is opened during heating (4). At this time, grill and microwave heating follow 2 ("Please press the start button"), and oven heating requires you to continue dry baking again ("Please do not add food until preheating is complete"). At this time, since we do not want the temperature of the heater to drop, the power supply to the heater is not stopped. Therefore, as soon as the door is closed, preheating continues, so there is no need to operate the start button, and there is no notification to prompt it.

After restarting, when the time is up or the heating temperature is reached (5), a notification that heating is complete is given (``Completed''). When heating the oven, an announcement is made to complete preheating and to bring in the food to be heated in preparation for main heating (``Preheating is complete. Please press the start button after placing the food.'').

Next, loading the object to be heated (6), operating the start button, and notifying when the time is up or the heating temperature has been reached (7) are similar to those for grilling and microwave heating.

In the present invention, synthesized voice is used as the notification means, and this greatly increases the notification effect compared to using the display means, and ensures good operability and high safety regarding preheating or dry firing.

As explained above, according to the present invention, in a composite heating device equipped with an electric heater and a high-frequency generation source, when the door body is opened and closed according to the set heating mode, the heated object in the heating chamber is heated. A synthesized voice informs you whether or not to bring in the object, so whether you should bring the object to be heated into the heating chamber using preheating mode for oven heating that requires dry baking, or heating using high frequency waves that are dangerous when dry baking. Users can accurately know what is happening, achieving a high level of safety.

Furthermore, when carrying in the oven heating, which can be complicated, users who are not familiar with oven cooking will be informed of how to handle the preheating and baking objects as the heating progresses and each time the door is opened or closed. It can be operated with care, and there is no chance of spoiling food by putting it in during preheating.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main body of a heating device showing one embodiment of the present invention, FIG. 2 is a block diagram showing the system configuration, and FIG. 3 is a diagram showing a specific example of operation and notification. 2... Door body, 4... Keyboard, 8... Microcomputer, 9
...Memory, 10...Heating chamber, 14...Magnetron,
15, 16... Heater, 18... Door switch, 20
...Synthesizer, 21...Audio memory, 22...Speaker.

Claims (1)

[Claims] 1. A heating chamber in which an object to be heated is placed, a plurality of heating means coupled to this heating chamber, a door body attached to the opening of the heating chamber so as to be openable and closable, and a means for detecting opening/closing of this door body. , a main control section that controls power supply to the plurality of heating means, an input means for setting a heating mode, and a voice synthesis section, and the main control section operates according to the heating mode set by the input means. , the opening/closing operation of the door is detected using the door opening/closing detection means, the voice synthesizing unit notifies whether the object to be heated should be carried into the heating chamber, and A heating device characterized in that it is configured to supply power to a heating means.