JPS614195A - Electronic control cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] G) Industrial application field The present invention relates to an electronically controlled cooking device such as a microwave oven.

First Prior Art In recent years, as seen in Japanese Utility Model Application No. 57-167505, an infrared sensor is provided to detect the temperature of the food by receiving infrared rays from the food, and the microwave heating process is based on the temperature detected by the sensor. When the temperature of the cell/cell increases, the reliability decreases. Therefore, in the microwave oven mentioned above,
The sensor should be cooled not only during microwave heating, but also after heating, while the heating chamber is still filled with high-temperature air, so that the conducted heat does not reduce the reliability of the sensor. That's what I do.

However, the cooling time of the sensor after the above-mentioned heating is completed is generally set short, so that the cooling of the sensor piles up before the hot air in the heating chamber is sufficiently reduced, and the reliability of the sensor is insufficient. This has not yet stopped the decline. On the other hand, by lengthening the cooling time mentioned above, it is certainly possible to significantly prevent a decrease in the reliability of the sensor, but it may be wasted if the sensor is always cooled for a long time after heating is finished. . That is, 1. For example, when the door is opened and the food is taken out after heating, the high temperature air inside the heating chamber quickly escapes to the outside, and in this case there is no need for long cooling as described above.

(c) Purpose of the Invention An object of the present invention is to efficiently cool an infrared sensor after heating is completed without waste.

B) Structure of the Invention In order to achieve the above object, the present invention provides a heating chamber for storing food, and a door for opening and closing the opening of the heating chamber.

1. A door detection means for detecting the open state of the door; 1. A heating means for heating the food; 1. An infrared ray top for detecting the temperature of the food by receiving infrared rays from the food.
a cooling means for cooling the sensor; and a control section controlling driving of the heating means based on the temperature detected by the sensor.

The cooling means is driven when the food is heated.

After heating the food, the cooling means is driven for a first predetermined period of time unless the door detection means detects the door closed state, and when the door detection means detects the door open state, the cooling means is driven again from the time of such detection. The cooling means is characterized in that the cooling means is configured to be driven for a second predetermined time period that is shorter than the first predetermined time period.

(e) Examples Hereinafter, an electronic oven t/ according to an example of the present invention will be explained with reference to the drawings.

Figure 1 shows the external appearance of the microwave oven, with the microwave oven body (1)
A heating chamber (2) for storing food is located inside.
The front opening of the heating chamber is opened and closed by a door (3). When the door is closed, the latch pawl (4) engages with a stopper (not shown) in the main body (1) to maintain the closed state, and the door (3) is opened by the door handle (5). ) to release the engagement between the latch pawl (4) and the stopper. Then, opening the door (3),
The closed state is detected by a door switch (6) in the main body (1) which turns off and on accordingly.

The door switch is operated by the latch pawl (4). Further, the main body (1) has a panel portion (7) on the front surface.

The panel section is provided with a keyboard (8) for setting cooking conditions such as heating temperature and heating time.

Figure 2 shows the main parts of the microwave oven, and shows the heating chamber (2).
) Microwaves are supplied from a magnetron (9) as a heating means through a waveguide (1 (l) to perform heating. A microwave fast cutting ring (111) is attached.Furthermore, a metal outer box fiz is fixed on the upper wall (21L) outside the heating chamber (2), and a metal inner box is fixed inside the outer box. A box r1) is fixed, and inside the inner box (1) are an infrared ray sensor fu41 as seen in Japanese Patent Application No. 58-2+7584 and a temperature circuit board a!9 for processing the output of the sensor. is arranged. A small hole facing the sensor a4 is formed in the lower wall of the inner box 0.The sensor (14) is guided through the ring ttn and the small hole. The temperature of the food is detected by receiving infrared rays from the food.

Furthermore, cooling air generated from the cooling blower rin is guided into the outer box az through the ventilation duct system.

When such cooling air is guided into the outer box (1), it passes around the inner box (1) and thereby substantially cools the sensor and temperature circuit board inside the inner box (1). Thereafter, the cooling air is exhausted to the outside from the lower opening of the outer box riz and is sent into the heating chamber (2) through the ring (11). In this case, the floating matter of water vapor 0 food waste generated from the food during microwave heating is prevented from rising through the ring a1, and the sensor fi4 is prevented from rising through the ring a1.
etc. are contaminated by such floating matter, so this is prevented.

Next, FIG. 6 shows the circuit of the microwave oven.

A microprocessor (2) is provided as a control section. The processor inputs cooking conditions and the like from the keyboard (8), and also inputs the temperature detected by the sensor fti4 via the A/D converter r21), and further inputs the door detection circuit including the door switch (6). Enter door opening/closing information from the device, and then $1 based on each information.
．． Second switching circuit (to), (24+ turned on).

Turn it off. When the IJI switching circuit (to) is turned on, power from the commercial power source (c) is supplied to a high voltage circuit consisting of a high voltage transformer, etc., so that high voltage is applied to the magnetron (9) and microwave heating is performed. . Also, when the above $2 switching circuit (goods) turns on,
The blower tiη is powered and driven.

Next, the operation of the microwave oven will be explained based on the flowchart of the program of process 4)-(a) shown in FIG.

Normally, a program cycles through the Sl and S2 steps. In step S1, a key operation on the keyboard (8) is detected, and in step 82, it is determined whether or not a cooking start operation has been performed on the keyboard (8).

1. For example, when performing cooking using microwave heating to a desired heating temperature, set the desired heating temperature using the keyboard (8) and perform a cooking start operation.
The program exits the above cycle and reaches step 85, where the above cooking is performed. That is, while checking the detected temperature from the sensor Q4), the '@1 switching circuit is turned on and microwave heating is started. In addition, the second switching circuit r24 is turned on and the blower fiη is driven, and the sensor (14) is cooled and floating objects in the heating chamber (2) are prevented from rising, thereby preventing the sensor (141, etc.) from becoming dirty. Then, when the detected temperature reaches the desired heating temperature, microwave heating is stopped and cooking ends. However, in this case, the blower (L?
) continues to be driven.

When the m-process is completed, the program advances to step 84. In this step, the door hook DR in the processor circle is cleared, and the first timer TM1 and second timer TM2 in the processor circle are set to 1 hour as the first predetermined time and 3 minutes as the second predetermined time, respectively. be done.

In the continuation <85 step, the door (3) is detected by the door detection circuit.
) is detected, and in the first 86 steps, the door (
3) is opened or not. In this case, the door (
3) is not open, and the program then reaches step 87. In this step, the second counter smoK in the processor screen starts counting time.

In the following step S8, it is determined whether the second counter 8EO has counted one second. In this case, when 1 second is counted, the program exits this cycle and reaches step S9. In this step, the time counting operation of the second counter SEC is stopped and its contents are cleared. next 8
In the 10th step, the first timer 'I'MI is decremented by 1 second.

In the following step S11, it is determined whether the content of the first timer TM1 has become zero. Since it is not 0 in this case, the program then proceeds to step 812. In this step, it is determined whether the door hook DR is 1 or not. Since it is not 1 in this case, the program then returns to step S5.

Then, the program starts to step from SS to S8S11, and when the second counter SEO counts 1 second again, the program goes through steps 89 to s12 again, and the first timer TM1 decreases the time by another 1 second. It will be done.

In this way, the program cycles through steps 85 to S8, but every second passes through steps 89 to B12 (hereinafter, such a state will be temporarily referred to as A cycle).

After that, 1 hour has passed since the end of cooking, @1 timer TM
When the content of 1 becomes 0, the 2 program escapes from the A cycle and reaches step 815. In this step, the second switching circuit is turned off, and the driving of the blower (lη), which has been continued since the start of cooking, is stopped.

Here, one hour has passed since the end of cooking.

Even though there is food in the heating chamber (2), high temperature air is no longer trapped, and the blower is stopped and sensor fi4
When the cooling of the sensor a4 stops, the reliability of the sensor a4 does not decrease due to heat.

Thereafter, the program advances to step S14.

In this step, all clearable areas in the processor (2) are cleared. Then, the program cycles through the 81° S2 step and enters a state in which a key operation for primary cooking is detected.

Next, after the above cooking is completed, when the program is in the A circulation state and the door (3) is opened to take out one food item, the program goes from the A circulation state to step 815.6 In this step, the door flag D'E% is set. 1 is folded. After that, the program goes through 87.88 steps and continues 85.86,815 until the 1 second counter BBiO counts 1 second.
After 7.8B steps are cycled and one second is counted, steps 89-812 are reached, in this case 814 steps. In this step, the second timer TM2 is decremented by one second. In the following step S17, it is determined whether the content of the second timer TM2 has become zero. In this case, it is not 0, so program V! , return to step 85. Therefore, the program is B5゜B6, 81 de, 87, 8
Cycling through 11 steps, 89 to B12 every second
．． B16,817 steps will be passed (this state is tentatively called CB circulation).

After that, from the time you open the door (3) and take out the food,
When the content of the second timer TM2 becomes 0 after a minute has elapsed, the program exits the B circulation and proceeds to step 81, where cooling of the sensor fa- is stopped.

Here, since there is no food in the heating chamber (2) because it has been taken out, the heating chamber (2) will be closed in about 3 minutes after the door (3) is opened.
2) High temperature air no longer stays inside.

Even if the sensor 9-fi4 cooling is stopped, the reliability of the sensor I will not be lowered due to heat.

(F) Effects of the Invention According to the present invention, the infrared sensor is cooled by the cooling means for a long time unless one food item is taken out after heating is finished, and when the door is opened and food is taken out, the infrared sensor is cooled down for a short time after the door is opened. The sensor is cooled for the required amount of time, which sufficiently prevents the sensor from becoming unreliable due to the heat in the heating chamber, and the cooling of the sensor does not take an unnecessarily long time. can be done efficiently and without waste.

[Brief explanation of the drawing]

The drawings show a microwave oven according to an embodiment of the present invention; FIG. 1 is an external perspective view, FIG. 1g2 is a sectional view of the main part, FIG. (2)...Heating chamber, (3)...Door, (6)...
Door switch, (9)... magnetron, fi41
...Infrared sensor +, ttn...Cooling blower, 4...
・Microprocessor.

Claims (1)

[Claims] (1) A heating chamber for storing food, a door for opening and closing the opening of the heating chamber, a door detection means for detecting the open state of the door, a heating means for heating the food, and a door for detecting infrared rays from the food. an infrared sensor for detecting food temperature by receiving light;
The controller includes a cooling means for cooling the sensor, and a control section that controls driving of the heating means based on the temperature detected by the sensor, and the control section drives the cooling means when heating the food, and also controls the heating means when heating the food. After heating, the cooling means is driven for a first predetermined period of time unless the door detection means detects the door open state, and when the door detection means detects the door open state, the cooling means is driven for the first predetermined time period from the time of such detection. An electronically controlled cooking appliance characterized in that the cooling means is driven only for a second predetermined time period shorter than the above-mentioned time period.