JPH0425450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic heating cooker equipped with a temperature sensor.

Conventional technology In recent years, due to remarkable advances in semiconductor technology in various heating cookers such as electric ovens, microwave ovens, and gas ovens, automatic heating cooking that automatically controls heating by memorizing the control temperature and heating time in the heating chamber has become possible. The vessels have evolved.

A conventional heating cooker of this kind will be explained.
FIG. 5 is a diagram showing temporal changes in the temperature near the center of the heating chamber of the conventional automatic heating cooker and the temperature detected by the temperature sensor.

In oven cooking, before heating the food, the inside of the heating chamber is often heated to a predetermined temperature, which is called preheating. A temperature sensor detects whether a predetermined temperature has been reached. The temperature in the heating chamber corresponds to the atmosphere of the temperature sensor, and the OFF temperature and ON temperature are set for the sensor's ambient temperature.
The heater continues to be energized until the ambient temperature of the temperature sensor reaches the OFF temperature, and then
Stop energizing until the atmosphere drops to the ON temperature,
Also, when the ON temperature is reached, energization starts.
By repeating this process, the temperature inside the heating chamber is controlled within a certain temperature range. To explain with reference to FIG. 5, when preheating is started, the heater is energized and the temperature inside the heating chamber increases. Accordingly, the ambient temperature of the temperature sensor also rises, and the current is continued until the temperature reaches the OFF temperature. When the atmosphere of the temperature sensor reaches the OFF temperature, the power supply to the heater is stopped, but the reason why the temperature inside the heating chamber becomes considerably higher than the control temperature at this point is as follows. Since the temperature sensor is installed on the wall of the heating chamber, which has a large heat capacity, there is a difference in the speed at which the temperature of the atmosphere around the temperature sensor and the temperature inside the heating chamber rise, and the temperature of the atmosphere around the temperature sensor rises more slowly. Therefore, when the atmosphere around the temperature sensor reaches the OFF temperature, the temperature inside the heating chamber becomes considerably higher than the control temperature. Preheating is completed when the atmosphere at the temperature sensor reaches the OFF temperature, and the user opens the door, stores the food in the heating chamber, closes the door, and restarts. The temperature inside the heating chamber drops considerably between the time the door is opened and the restart, but the atmosphere around the temperature sensor has a large heat capacity, so it does not drop significantly. Therefore, after the restart, the temperature of the atmosphere around the temperature sensor reaches the ON temperature. The heater is not turned on and power is not turned on. When the temperature sensor's atmosphere drops to the ON temperature, the heater starts energizing, but at this time the temperature inside the heating chamber drops considerably, so the next time it turns OFF, it will exceed the control temperature by a large amount, just like in the case of preheating. Resulting in. In the case of oven cooking, the first OFF after restarting after preheating.
Temperature A affects cooking, and if it significantly exceeds the control temperature, overcooking or overcooking will occur. After the first OFF, sufficient heat is stored in the heating chamber and the atmosphere around the temperature sensor, so temperature control is performed in a fairly narrow range around the control temperature and continues until the end of cooking.

Problems to be solved by the invention As described above, in the conventional automatic heating cooker,
After the food is stored in the heating chamber after preheating is completed and the food is restarted, it takes time for the temperature sensor to cool down because the heat capacity of the atmosphere around the temperature sensor is large until the heater is energized. Therefore, the temperature inside the heating chamber drops considerably, and the amount of heat in the heating chamber as a whole decreases significantly. Even if the heater starts to be energized, the amount of heat in the entire heating chamber is small, so the atmosphere at the temperature sensor does not rise easily and the temperature rises only in the heating chamber. By the time the temperature sensor reaches the OFF temperature, the temperature in the heating chamber is at the control temperature. It exceeds considerably. In this way, after the food is stored in the heating chamber after preheating is completed and cooking begins, the temperature inside the heating chamber fluctuates significantly up and down, which has a negative effect on oven cooking. For example, only the surface of the food gets burnt, and the heat does not get to the inside of the food, leaving it raw.

Additionally, there has been a problem in the past in that it takes time for the heater to turn on after restarting, resulting in longer cooking times.

The present invention solves these conventional problems, and provides excellent automatic heating that controls the temperature within the heating chamber during cooking with little variation, making it ideal for oven cooking, and shortening the overall cooking time. It provides cooking utensils.

Means for Solving the Problems The present invention provides a control unit that controls power supply to a heater.
When food is stored in a heating chamber after preheating and cooking is started, the configuration is such that power is continued to be supplied to the heater for a predetermined period of time after the start of cooking, regardless of the temperature detected by the temperature sensor.

Function The automatic heating cooker of the present invention is configured to continue supplying power to the heater for a certain period of time regardless of the detected temperature detected by the temperature sensor, when food is stored in the heating chamber and cooking is started after preheating is completed. Therefore, even if the temperature detected by the temperature sensor exceeds the control temperature after cooking starts, the heater will be energized.
It is possible to prevent a sudden drop in temperature inside the heating chamber due to food being stored in the heating chamber. This makes it possible to realize temperature control with little difference in temperature within the heating chamber, which is optimal for oven cooking.

Further, since it is possible to prevent the temperature inside the heating chamber from decreasing unnecessarily after the end of preheating and the start of cooking, the cooking time can be shortened.

Embodiment Hereinafter, an automatic heatable cooker according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of an automatic heating cooker according to an embodiment of the present invention, and FIG. 2 is a top sectional view of the same device. 1 is a heating chamber in which the food to be heated 2 is stored and cooked; 3a is an upper heater installed on the upper surface of the heating chamber 1 to heat the object to be heated 2 from above; and 3b is installed in the lower surface of the heating chamber 1. 4 is a temperature sensor that detects the temperature inside the heating chamber 1; 5 is an upper heater 3a;
This is a control device that controls the output distribution and cooking time of the lower heater 3b.

FIG. 3 shows an electric circuit of an automatic heating cooker according to an embodiment of the present invention. Electric power from the product power supply 6 is supplied to the heating heaters 3a, 3 through a temperature control switch 7 for adjusting the temperature of the heating chamber 1, and a heater changeover switch 9 for switching the supply of electricity to the upper heater 3a and lower heater 3b.
3b.

A microcomputer 11 that controls automatic control of the heating cooker receives instructions from a keyboard 13 inputted via an interface 12 and temperature information in the heating chamber 1 inputted from a temperature sensor 4 via an A/D converter 14. Based on the time from the start of cooking that is counted inside the microcomputer 11,
The first relay 8 and the second relay 10 are driven to open and close the corresponding temperature control switch 7 and heater changeover switch 9, respectively. Thereby, the temperature inside the heating chamber 1 can be controlled within a certain temperature range, and the output distribution of the upper and lower heaters 3a, 3b can be changed.

FIG. 4 is a diagram showing temporal changes in the temperature near the center of the heating chamber of the automatic heating cooker of the present invention and the temperature detected by the temperature sensor.

When the preheating for heating the inside of the heating chamber 1 before cooking is completed, the cook opens the door, stores the cooked food 2 in the heating chamber 1, closes the door, and starts cooking. When the door is opened, the temperature inside the heating chamber 1 drops rapidly, but the temperature detected by the temperature sensor 4 does not drop easily because the temperature sensor 4 is installed near the wall of the heating chamber 1, which has a large heat capacity. lower heater 3a,
3b does not reach the ON temperature at which it is energized. For this reason, in conventional automatic heating cookers, the upper and lower heaters 3a and 3b are not turned on for several minutes after the start of cooking, and the temperature in the heating chamber 1 often drops considerably. However, according to this embodiment, after starting cooking,
The program was structured so that the temperature detected by the temperature sensor 4 was ignored (K range) for a certain period of time (2 minutes in the example) and the upper and lower heaters 3a and 3b were energized. The temperature inside 1 continues to rise rather than fall. On the other hand, since the heated food 2 is at a low temperature, the temperature detected by the temperature sensor 4 decreases little by little as the overall amount of heat decreases. After the neglect time K of the temperature sensor 4 has elapsed, the detected temperature of the temperature sensor 4 is
If the temperature has not decreased to the ON temperature, the supply of electricity to the upper and lower heaters 3a, 3b is stopped at that point, and the temperature in the heating chamber 1 continues to decrease. However, since the temperature of the food to be heated has risen considerably, the rate of temperature drop is small, and energization of the upper and lower heaters 3a and 3b is started before the temperature in the heating chamber 1 falls much. Next, the upper and lower heaters 3a and 3b
The OFF temperature does not greatly exceed the control temperature as in the conventional example, since the temperature in the heating chamber 1 did not drop suddenly. In this way, immediately after preheating ends and cooking starts, the temperature detected by the temperature sensor 4 is ignored and the upper and lower heaters 3a and 3b are forcibly turned on.
By providing a certain period of time to turn it on, it is possible to prevent sudden temperature changes in the heating chamber 1 at the beginning of cooking, and achieve optimal temperature control for oven cooking.

In addition, immediately after the start of cooking, the upper and lower heaters 3a and 3b
By setting a certain period of time for forcibly turning on, it became possible to shorten the overall cooking time.

Effects of the Invention As described above, the automatic heating cooker of the present invention has the following effects because it is configured to ignore the temperature detected by the temperature sensor and forcibly turn on the heater for a certain period of time immediately after the completion of preheating and the start of cooking. Obtainable.

(1) After preheating is completed, rapid temperature changes in the heating chamber at the beginning of cooking can be suppressed, and the optimum temperature in the heating chamber can be achieved for oven cooking of kutsky, sponge cake, etc.

(2) Useless heating at the beginning of cooking after preheating is completed.
Eliminate OFF time and significantly shorten cooking time.
Efficient use of equipment can be achieved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of an automatic heating cooker according to an embodiment of the present invention, Fig. 2 is a top sectional view of the device, Fig. 3 is an electric circuit diagram of the device, and Fig. 4 is the temperature inside the heating chamber. FIG. 5 is a diagram showing the relationship between the temperature inside the heating chamber of a conventional automatic heating cooker and the temperature detected by the temperature sensor. DESCRIPTION OF SYMBOLS 1... Heating chamber, 3a... Upper heater, 3b... Lower heater, 4... Temperature sensor, 5... Control device.

Claims (1)

[Claims] 1. A heating chamber for storing food, a heater for increasing the temperature in the heating chamber, a control unit for controlling power supply to the heater, and detecting the temperature in the heating chamber,
a temperature sensor that transmits the detected temperature to the control section, and the control section heats the heating chamber to a predetermined temperature without storing the food in the heating chamber, and then stores the food in the heating chamber and cooks the food. To start,
The automatic heating cooker is configured to continue supplying power to the heater for a predetermined period of time after the start of cooking, regardless of the temperature detected by the temperature sensor.