JPS6011773B2 - food heating equipment - Google Patents

Description

Detailed Description of the Invention The present invention relates to a food heating device, which detects the temperature inside the heating chamber and turns on the heat source based on this signal.
A device equipped with a function to control the temperature inside the heating chamber is equipped with a separate semiconductor memory element, and the heating is performed only when the food is not heated again within an arbitrarily set time after the food has finished heating. storing information in the semiconductor memory element so that self-cleaning of the room is automatically performed;
This allows predetermined self-cleaning to be performed.

This type of device includes, for example, an element that detects the temperature in the heating chamber, a device that sets a heating target temperature in the heating chamber, and a timer that sets the time to maintain this temperature after reaching this temperature, for example. As shown in FIG. 1, set the food heating target temperature T and the timer's failure,
There is a food heating device that performs self-cleaning in a separate predetermined setting after heating the food.

In these food heating devices, when a heating start switch is pressed after food is stored in a heating chamber and the above-described settings are made, a heat generating source is activated and heating is started. When the temperature in the heating chamber rises and the signal from the temperature detection element reaches the target temperature T, the heat-retaining state is entered from then on, and the heat source is controlled to turn on and off as the temperature in the heating chamber rises and falls. By doing this, the temperature in the heating chamber is maintained at the target temperature and the food is heated. Next, when the heat retention time has elapsed, the heat generating source stops operating, and heating of the food ends. The food is then taken out from the heating chamber, but depending on the type of food, the juices and oils from the food may adhere to the heating chamber and make the heating chamber extremely dirty. It is necessary to perform so-called self-cleaning, in which the temperature is raised to a higher temperature than when heating the food, and the catalyst burns off these stains.
As shown in , the heating target temperature T. Set the timer to the self-cleaning temperature Ts and then set the timer again for the self-cleaning time G' and press the heating start switch again. The self-cleaning process is completed by heating the inside of the heating chamber for a certain amount of time and burning off the dirt mentioned above.Therefore, if you try to perform self-cleaning, you will have to set the self-cleaning temperature and time again after the food has finished heating. This has the disadvantage that this operation is troublesome.

Also, if you inadvertently forgot to perform self-cleaning, there was a risk that a strange odor would come out of the heating chamber.Furthermore, there was also the drawback that you could accidentally set the self-cleaning temperature and time incorrectly. The present invention was made in view of the above circumstances, and its purpose is to provide a separate semiconductor memory element and set the temperature and time for self-cleaning on this element in advance. To provide a food heating device that automatically performs self-cleaning when food is not reheated within a certain period of time after heating is completed.

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

In FIG. 2, the turtle is an AC power source. A heat generating source 4 is connected to this power source i via an AC control element 2 and a door switch 8. This heat source is for supplying thermal energy into the heating chamber, and is composed of, for example, a ceramic heater or a sheathed heater.
A one-chip microcomputer (hereinafter referred to as a microcomputer) is connected to a DC power source for electronic circuits and a power pulse generation circuit S that generates pulses at the frequency of the power source. is Yabutaya. In addition, the microcomputer hole is a heating start switch base, an automatic self-cleaning switch 2 for turtle and self-cleaning, an operation switch group 8 including a hand sardine self-cleaning switch 8-3, and a self-cleaning release switch 8-4, for the display device. The display device IQ is connected to the display device IQ through the buffer amplifier group 9, and the A/D comparison resistor block KAMEKAME which compares the analog value and digital value of temperature, and the temperature detection element i2 which detects the temperature inside the heating chamber. A comparator blade 3 for comparing the size is connected to the ignition circuit 4 for controlling the AC control element.Furthermore, the ROM part of the microcomputer y records the heating target temperature T and the heat retention time. A function for setting predetermined values as shown in FIG. 3 by operating the operation switch group, and a function for displaying these values, and a switch for self-cleaning such as when the automatic self-cleaning switch 8-2 is pressed, the screen as shown in FIG. 3 is displayed. It has a function to display the indicator lamp in advance.In addition, the ROM of the microcontroller 7
For example, as shown in FIG.
It has a function of repeatedly controlling FF or ON-OFF. In other words, when the automatic self-cleaning is set, after the food is heated at the heating target temperature T for the heat retention time t, the heating chamber door is opened, the food is taken out, and the door is closed again. If the heating of the next food is not set within a certain time tm, for example, io minutes after closing, self-cleaning is automatically performed at the self-cleaning temperature Ts for the heating time s as shown in Figure 4. In addition, in FIG. 4, Ts and G are set to predetermined values. Also, in this embodiment, tm is set to, for example, 10 minutes. The operation of the present invention will be explained.

First, when the AC power source 1 is connected, food is stored in the heating chamber, and the door is closed, the door switch 3 is closed. Furthermore, by operating the operation switch group 8, the appropriate heating target temperature T and warming time t are set and displayed on the display device as shown in FIG. 3, depending on the food. In this case, if the heating chamber becomes dirty depending on the type of food, select self-cleaning and press the self-cleaning switch 8-2. Then, the indicator lamp of the display unit 8' lights up as shown in Figure 3, and the microcomputer 7 is called up from the ROM in the microcomputer 7 to operate the heat generating sources 4 in the order shown in Figure 4. and prepared. Next, heating start switch 8
-1 is pressed, the AC control element 2 turns to O as shown in Fig. 4.
It enters the N state, and the heat generating source 4 connected thereto operates to start heating. The microcomputer 7 also detects the voltage obtained through the temperature detection element 2 and the A/D comparison resistor 1.
1 and the voltage created by the output from the microcomputer 13
The temperature analog signal is converted to a digital signal and measured sequentially. When the temperature inside the heating chamber rises and reaches the target temperature T, the microcomputer 7 operates to enter a heat retention state as shown in FIG.

Therefore, as the temperature in the heating chamber rises and falls, the heat source 4 is controlled by turning on and off, and when the heat retention time t has elapsed, heating of the food ends and the heat source 4 stops all operations. . If you open the door of the heating chamber, take out the food, and then close the door again, you will have to make some settings via the operation switch group 8 in order to heat the next food within 10 minutes from this time. If not, the heat source 4 starts operating after 10 minutes as shown in FIG. 4 and automatically starts self-cleaning. If the target temperature T and heat retention time t2 are set in order to heat the next food within 10 minutes, self-cleaning is not performed as shown in FIG. 4, and the next food is heated. After the food has finished heating, take it out and close the heating chamber door.
If you do not set the next food to be heated within 0 minutes,
Self-cleaning will start automatically after 10 minutes. When self-cleaning is started and the temperature inside the heating chamber reaches the self-cleaning temperature Ts, the microcomputer 7 operates to enter a heat-retaining state as shown in FIG. Therefore, the heat source 4 is turned on as the temperature inside the heating chamber rises and falls.
-○FF is controlled, and when the self-cleaning time b has elapsed, self-cleaning of the heating chamber is completed and all operations of the heat generating source 4 are stopped. Although a detailed explanation of the operation will be omitted, if you press the hand sardine self-cleaning switch 8-3, you can start self-cleaning from this time, so if the heating chamber is dirtier than expected, you can use this function. can be used.

Conversely, if there is less dirt than expected, the self-cleaning function can be immediately canceled by pressing the self-cleaning cancel switch 8-4. As explained above, according to the present invention, self-cleaning can be set in advance as necessary.
Not only can self-cleaning be performed automatically after the heating of the food is finished, but there is no need to cancel the self-cleaning each time when heating the food continuously. Therefore, there is no need to worry about forgetting self-cleaning and causing a strange odor from the heating chamber. Since the temperature and time are predetermined, all you have to do is press the setting switch, so there is no risk of accidentally setting the temperature or time, and the operation is extremely easy with just one touch. In this embodiment, there is only one combination of temperature and time for self-cleaning, but it is also possible to provide two or more combinations of different temperatures and times as necessary.

Furthermore, although the above embodiment has been described using a single microcomputer, it goes without saying that the present invention is not limited to this, and a control circuit having the above-mentioned functions may also be used.

Brief explanation of the drawings Fig. 1 shows the operation panel and temperature control pattern of a conventional food heating device, and Fig. 2 is a block diagram showing an embodiment of the control circuit of the food heating device according to the present invention. 3 is a display example of the display device shown in FIG. 2. FIG. 4 is a diagram showing the temperature control pattern of the food heating device and the operating state of the heat source 4 in the present invention.

The turtle in the drawing is a heat source, 7 is a one-chip microcomputer, 8-2 is an automatic self-cleaning switch, and 8-3 is a one-chip microcomputer.
10 is a self-cleaning switch, 10 is a display device, and 12 is a temperature detection element for detecting the temperature inside the heating chamber. Shigeru 1 Kanta 4 illustrations *2 Illustrations 34

Claims (1)

[Claims] 1 A heating chamber that heats food, a door provided in the heating chamber that can be opened and closed, and a door switch 3 that detects the opening and closing of this door.
, a heat generation source 4 that supplies thermal energy into the heating chamber, and a temperature detection element 12 that detects the temperature inside the heating chamber;
There is an operation switch group 8 consisting of a switch for setting the temperature and time for heating food as well as a switch for setting implementation of self-cleaning heating, and an operation switch group 8 that indicates when the self-cleaning switch in this operation switch group is set. a display device 10 for displaying the self-cleaning switch; and a switch for setting the temperature and time for heating the food in the operation switch group, in addition to displaying a message to that effect on the display device when the self-cleaning switch is set. The food is heated by activating the heat generating source under the specified heating conditions, and after the heating is completed and the door is opened, a predetermined period of time elapses after the door switch detects that the door is closed. self-cleaning inside the heating chamber at a predetermined temperature for a predetermined time by operating an appropriate one of the operation switches to activate the heat source only when settings for the next food heating are not made. A food heating device characterized in that it is equipped with a control circuit 7 for performing the following steps.