JPH02309918A - Heating cooker - 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 Field of Industrial Application The present invention relates to a heating cooker used in general households.

Conventional technology Conventionally, this type of heating cooker has a structure in which a container is removably placed on a heat-generating member (hereinafter referred to as a heater) installed inside the main body. If necessary, the container can be easily removed from the main body for cleaning.

Problems to be Solved by the Invention However, with the above-mentioned structure, good heat conduction between the heater and the container may not be achieved due to foreign objects being trapped between the heater and the container, or due to deformation of the heater or the container. In some cases, the heater may overheat, shortening the heater's lifespan, or the heating cooker may malfunction due to overheating of parts around the heater, or voltage fluctuations (voltage rises) or other factors may cause the rated heating power to be reduced. If it becomes larger, problems such as cooked food boiling over from the container will occur.

However, as disclosed in Japanese Utility Model Application Publication No. 62-100126, for example, when cooking rice, the temperature of the inner pot is detected by a container sensor that detects the temperature of the container (inner pot).

Based on this temperature detection result, the power supply to the rice cooking heater is controlled using the power appropriate for the amount of rice to be cooked to suppress the rise in temperature of the inner pot, or the rice temperature after rice cooking is completed is lowered to a temperature lower than the normal warming temperature. Some rice cookers control the power supply during rice cooking using a rice cooking and warming program, such as controlling the power supplied to the warming heater based on the detection result of the temperature of the inner pot to suppress the rise in the temperature of the inner pot.

However, if the situation described in item (■) occurs, there will be a delay in response when the temperature of the inner pot is detected by the container sensor due to the thermal resistance between the heater and the container, causing the heater to overheat. The shortcomings of are not resolved.

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and includes a heater that is attached to the inside of the main body and on which a container is removably placed, and detects the temperature of the heater. A temperature sensing member (hereinafter referred to as a sensor) is attached to the main body, and a control device is installed inside the main body, which has the function of decreasing the heating output to the heater in stages according to the rise in temperature of the heater detected by this sensor.

By doing this, if a foreign object is caught between the heater and the container, or if the heater or container is deformed and good heat conduction is not achieved between the two, the sensor can detect overheating of the heater. In response to this detected temperature rise, the output to the heater is adjusted to decrease in stages via the control device.

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

In FIG. 1 showing the configuration of the embodiment, 1 is a main body, 2 is a heater installed inside the main body 1, 3 is a sensor fixed to a part of the heater 2 to detect the temperature of the heater 2, and 4 is a sensor from the sensor. 5 is a container removably placed on the heater 2; 6 is a container sensor that comes into contact with the outer bottom of the container 5 to detect the temperature of the bottom of the container 5; It is.

FIG. 2 is a control circuit diagram related to the heating cooker of the present invention regarding the control device 4. In the figure, 9 is a commercial power source of AClooV, and this power source 9 is connected to the heater 2 and the series circuit of the normally open point 7 of the relay 8. and the primary winding of the transformer are connected in parallel, and the alternating current side of the rectifier circuit is connected to the secondary winding of the transformer. A series circuit of a relay 8 and a transistor 10 is connected to the DC side of the rectifier circuit, and the base of the transistor 10 has a function of decreasing the heating output to the heater 2 in stages according to the temperature rise of the heater 2 via a resistor. The output port D of the microcomputer 13 is connected to the output port D of the microcomputer 13. A stabilizing circuit 14 is connected to the DC side of the rectifier circuit, and its output is connected to the input port A of the microcomputer 13. In addition, input port B has a connection point between sensor 3 and resistor 11, and input port C has container sensor 6.
and the connection points of the resistor 12 are connected to each other.

FIG. 3 is a flowchart showing the operation of this cooker,
In the figure, Ta is the temperature of the heater 2 detected by the sensor 3, Tb is the temperature of the container detected by the container sensor 6, and T is the temperature during control of the food being cooked.

T2 indicates the temperature at which the end of cooking is detected, and T indicates the temperature related to the limit to prevent malfunction of the temperature fuse or boiling over of cooked food.

Next, the operation of this embodiment will be explained.

First, to explain the operation of the control circuit shown in FIG. 2, the voltage divided by the sensor 3 and the resistor 11 is
The temperature changes depending on the temperature detected by the microcomputer 13 and is input to the input port B of the microcomputer 13. Further, the temperature detected by the container sensor 6 is similarly input to the input port C of the microcomputer 13.

These inputs cause an output from the output port D of the microcomputer 13, and this output causes current to flow to the base of transistor 0, turning transistor 0 ONL and relay 8.
A current flows through the contact point 7, and the contact point 7 is closed. Therefore, heater 2
AClooV of electric current g9 is applied to heater 2 to heat it.

When using the rice cooker, as shown in FIG. 3, after the start 101, it is checked at 102 whether the temperature Ta≧temperature T, and it is checked whether the temperature of the heater 2 is higher than Ta. As a result, in the normal case where the temperature Ta is equal to or lower than the temperature T, the heater 2 is energized at LO4 at a 100% energization rate. Then, at 105, power is applied at 100% energization rate until temperature Tb≧temperature T□, and when temperature Tb≧temperature T□, 106
Proceed to. 106, when temperature Ta<temperature T3, 1
At 08, the heater 2 is energized at a 80% energization rate. After that, step 108 (energizing heater 2 at 80% energization rate) is continued until temperature Tb≧temperature T2 or higher in step 109, and temperature Tb≧
When the temperature reaches T2 or higher, proceed to 110, turn off the power to the heater 2, start a timer (not shown) in 111, wait for the timer to elapse for 13 minutes in 112, and the cooking is completed when 13 minutes have elapsed. do.

If a foreign object gets caught between the heater 2 and the container 5,
If the heater 2 overheats more than necessary due to deformation of the heater 2 or the container 5, or if the heating power exceeds the rated power due to an increase in voltage, etc., and the temperature Ta≧temperature becomes lower, the temperature changes from 102 to 103 and 50. % conduction rate, 106 at 106
Proceed to step 7 and energize the heater 2 at a 40% energization rate to reduce the heat and cook.

As described above, according to the present invention, there is provided a control device which has a function of attaching a sensor to the heater to detect the temperature of the heater and gradually reducing the heating output to the heater in accordance with the rise in temperature of the heater detected by the sensor. Because of the provision of a The output is regulated in a stepwise manner via the control device, thereby preventing the heater from overheating and extending the life of the heater, thereby providing a heating cooker with improved safety and usability.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a heating cooker according to an embodiment of the present invention, FIG. 2 is a control circuit diagram thereof, and FIG. 3 is a flowchart showing the same operation. 1... Main body, 2... Heat generating member (heater),
3...Temperature detection member (sensor). 4...Control device, 5...Container.

Claims (1)

[Claims] Temperature detection for detecting the temperature of the heat generating member (2) in a heating cooker in which a heat generating member (2) is attached inside the main body (1) and a container (5) is removably placed on the heat generating member (2). The member (3) is attached to the heat generating member (2), and the heating output to the heat generating member (2) is gradually reduced in accordance with the temperature rise of the heat generating member (2) detected by the temperature detection member (3). A heating cooking device characterized in that a control device (4) having a control device (4) is provided inside a main body (1).