JPS5949680B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device, and particularly to a high-frequency heating device that has a function of measuring the temperature of air in a heating chamber and controlling the heating of food during microwave heating and heater heating. This allows the temperature of food to be controlled accurately and accurately when heated by waves.

Conventionally, this type of apparatus, as shown in FIG. 1, has a microwave heat source 4-1 that supplies microwaves into a heating chamber 14 in which food is stored, and a heater heat source 4- that heats the air in the heating chamber. 2, and a temperature detection element 10 for measuring the temperature of the air in the heating chamber, and after the food is placed in the heating chamber, the food is heated using the heat generating source 4-1 or 4-2. , the heat generation source was controlled based on the signal taken in from the temperature detection element 10.

In other words, when heating food using the microwave heat source 4-1, the microwave directly heats only the food and does not heat the heating chamber or the air inside the heating chamber, so that the rise in the temperature of the food can be used to heat the food. The temperature of the food was controlled by detecting a very slight rise in temperature of the air surrounding the food. Furthermore, when heating food using the heater heat source 4-2, the heat source 4-2 first warms the air in the heating chamber 14, and this air is used to heat the food stored in the intermediate heating chamber. The temperature of the food was controlled by measuring the temperature of the air in the heating chamber using the temperature detection element 10, and controlling the heater heat source based on this value. Therefore, when heating with the microwave heat source 4-1, the temperature rise of the air in the heating chamber is extremely small, and this slight temperature rise value is measured, whereas the heater heat source 4-2
When performing heating, the temperature rise of the air in the heating chamber is utilized, so this value is also extremely large, and this large temperature rise value is measured using the same temperature detection element 10. Therefore, if you use a heater heat source after heating using a microwave heat source, there is almost no effect from the previous heating, so there is no problem. Immediately after heating, the temperature of the air in the heating chamber increases significantly, so when heating is performed using a microwave heat source next time, the temperature detection element 10
It is not possible to measure the temperature rise of food at all using
If heating was started in this state, the microwave heat source would not stop, resulting in problems such as damage to the food or the temperature of the food being significantly different from the set value even after heating was stopped. The present invention has been made in view of the above circumstances, and its purpose is to heat the food using a heater heat source, and when the temperature of the air in the heating chamber is higher than a predetermined value, the microwave heat source is used to heat the food. An object of the present invention is to provide a high-frequency heating device that overcomes the above-mentioned drawbacks by preventing heating of the heating chamber, cooling the heating chamber by arbitrarily replacing air, and lowering the temperature of the air in the heating chamber in a short time. It is something.

The present invention continues to measure the temperature of the air in the heating chamber through the temperature detection element even after finishing heating with the heater heat source, and when this value is a predetermined value, that is, the microwave heat source starts heating. If the temperature rise of the food exceeds a detectable value even when the food is heated, place the food in the heating chamber and press the heating start switch to prevent the microwave heat source from operating, and open the door of the heating chamber. A separately provided blower device operates to exhaust the air inside the heating chamber, cooling the heating chamber and lowering the temperature of the air inside the heating chamber, allowing the high-frequency heat source to operate in a short period of time.

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

FIG. 2 is a diagram showing the main points of the configuration of the high-frequency heating device of the present invention, and FIG. 3 is an example of a block diagram of the same control circuit. In these figures, 1 is an AC power supply, and this power supply 1 is connected to a microwave heat source 4-1 and a heater heat source 4 via an AC control element group 2 including AC control elements 2-1 and 2-2, and a door switch 3. A heat generating group 4 including -2 is connected. Further, a microcomputer (hereinafter referred to as microcomputer) 6 is connected to the power supply 1 via a power supply 5 for electronic circuits. This microcontroller is approximately I/0 (input/output section) 6
A CPU (Central Information Processing Unit) 6-2 is connected to the CPU (Central Information Processing Unit) 6-2 via -1, and is connected to a ROM (read-only storage device) 6-3 and a RAM (a storage device that can write and read data) 6-
4 is connected. The microcomputer 6 also includes a group of operation switches T including a heating start switch T-1, and a microphone that lights up as necessary when the air temperature in the heating chamber is higher than a predetermined value. A group of various display devices 8 including a heating stop indicator light 8-1 are connected. Furthermore, the microcontroller has an A/D that compares the analog value and digital value of temperature.
A comparator 11 for comparing the magnitudes of these is connected via a comparison resistance block 9 and a temperature detection element 10 for detecting the temperature of the air in the heating chamber, and an ignition circuit 12- for controlling the AC control element group 2. A group of ignition circuits 12 including 1 and 12-2 are connected. Furthermore, a blower device 13 is connected to the microcomputer 6 via a buffer amplifier, and this blower device has a function of discharging the air inside the heating chamber to the outside when the door 15 of the heating chamber 14 is opened when the conditions described below are met. ing. On the other hand, is there a group of operation switches in the ROM section 6-3 of the microcomputer 6? a function of storing the heating contents set through the RAM section 6-4, for example, 6-b in FIG. 5;
A function is provided to display this content on the display device group 8. Furthermore, the ROM section 6-3 of the microcomputer 6 is programmed to control the heat source group 4 to perform heating based on the heating contents 6-b stored in the RAM section when the heating start switch T-1 is pressed. and a function of converting the temperature signal taken in from the temperature detection element 10 into a digital value via the peripheral circuits 9 and 11 and storing this value in the RAM section 6-4, for example 6-a in FIG. There is. Furthermore, the ROM section 6-3 of the microcomputer 6 has a predetermined temperature value, for example, 6-A in FIG. A function that records the upper limit of the temperature of the air in the heating chamber and compares this value of 6-A with the value of 6-a stored via the temperature detection element even after heating is completed. When the value of 6-a is larger than that of the microphone. Even if the heating start switch J or P is pressed after turning on the mouth wave heating stop indicator light 8-1 and setting the heating content using the microwave heat source 4-1 via the operation switch group 7, the micro It has a function that prevents the wave heat source from operating. In addition, the ROM part 6-3 of the microcomputer 6 has a message that if the door 15 of the heating chamber 14 is opened when the value of 6-a is larger than the value of 6-A, The blower device 13 is provided with a function of operating the blower device 13 until the value of 6-a becomes smaller. Next, the operation of the present invention will be explained based on such a configuration.

First, connect the AC power supply 1, put food in the heating chamber 14,
When the heating chamber door 15 is closed, the door switch 3 is closed.

Next, when the user inputs the content of heating using the heater heat source 4-2 via the operation switch group 7, the microcomputer 6 stores this content in the RAM section 6-b of the RAM section 6-4. Displayed on the display device group 8. Then, when the user presses the heating start switch J or P, the microcomputer 6
The AC control element 2-2 is set to the ON state, the heater heat generating source 4-2 is operated, and the air in the heating chamber 14 is first heated, and the food is heated through this air. Also, the microcomputer 6 includes the temperature detection element 10 and its attached circuit 9$? and 11, the temperature of the air in the heating chamber is sequentially converted into a digital value and measurement is started. After that, when heating based on the set heating contents is completed, the microcomputer 6 turns the AC control element 2-2 into the OFF state, and stops the operation of the heater heat generating source 4-2. Therefore, the user opens the door 15 of the heating chamber 14 and takes out the food, but even after that, the microcomputer 6 continues to measure the temperature of the air in the heating chamber 14 via the temperature detection element 10, and stores this value in the RAM section. The temperature value is stored in 6-a of 6-4 and compared with the temperature value previously recorded in 6-A of ROM section 6-3. However, heater heat source 4
Immediately after finishing heating at -2, the value is 6-a compared to 6-A.
Since the value of is larger, the microcomputer 6 immediately turns on the micro heating stop indicator light 8-1 to indicate that the temperature of the air in the heating chamber is still high and microphone mouth wave heating cannot be performed. Since the door 15 of the heating chamber is open, the blower device 13 is operated and the high temperature air in the heating chamber begins to be rapidly exhausted as shown in FIG. after a while,
The heating chamber is cooled by the air sucked in, and the temperature of the air in the heating chamber is below V, and the temperature stored in this 6-a is 6-A.
When the value becomes lower than the value recorded in , the microcomputer 6 immediately turns off the microwave heating stop indicator light 8-1, indicating that microwave heating can be used, and stops the operation of the blower device 13. If the user uses the heater heat source 4-2 again to perform heating, there is no need to lower the temperature of the air in the heating chamber, so immediately close the door of the heating chamber after taking the food out of the heating chamber. Then, the operation of the blower device 13 is stopped, and the temperature of the air in the heating chamber is not unnecessarily lowered, so that the heating efficiency is not lowered. In such a case, even if the user sets the heating content to perform heating using a microwave heat source, the microcomputer 6 stores this content in 6-6 of the RAM section 6-4. However, even if the user presses the heating start switch J or P, the ROM section 6-
3, the microwave heating source 4-1 does not operate, and therefore the above-mentioned heating is not performed. As explained above, according to the present invention, the temperature of the air in the heating chamber is continuously measured even after heating is finished, and when this value is larger than a predetermined value, the door of the heating chamber is arbitrarily opened. By using Wave heating can be performed.

Similarly, if the temperature of the air in the heating chamber is higher than the predetermined value, the microwave heat source will not operate even if you set the heating content to use the microwave heat source, so there is a risk of overheating and damaging the food. do not have. This embodiment has the advantage of displaying this information using an indicator light for the convenience of the user.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration around the heating chamber of a conventional high-frequency heating device, FIG. 2 is a diagram showing the main points of the configuration of the heating pigeon holder according to the present invention, and FIG. 3 is a diagram showing the configuration of the high-frequency heating device according to the present invention. An example of a control circuit block diagram, Figures 4 and 5 are respectively shown in Figure 3.
FIG. 2 is a diagram illustrating the operation of a ROM section and a RAM section of the microcomputer shown in the figure. In the figure, 4-1 is a microwave heat source, 4-2 is a piece heat source, 6 is a micro combination, 10 is a temperature detection sensor, 13
1 is a blower device, and 14 is a heating chamber.

Claims (1)

[Claims] 1 A heating chamber 14 that stores food, an opening/closing door 15 provided in this heating chamber, and a door switch 3 that detects opening/closing of this door.
, a microwave heat source 4-1 that supplies microwaves into the heating chamber, a heater heat source 4-2 that heats the air within the heating chamber, a temperature detection element 10 that detects the temperature of the air within the heating chamber, and the temperature A control device that controls the operation of the microwave heat source and the heater heat source based on a signal from a detection element, wherein a blower device 13 that exhausts air in the heating chamber and the microwave heat source are activated. a display device 8-1 that displays a message to that effect when the heating is not possible; disabling the microwave heat source and activating the display device when the temperature exceeds the temperature limit, and activating the blower device when the door switch detects that the door is opened; includes a control device 6 that enables the microwave heating source, deactivates the display device, and stops the operation of the blower device when the temperature detected by the device falls below the predetermined value. A high-frequency heating device characterized by: