JPH05207925A - Rice cooker - Google Patents

Abstract

PURPOSE:To prevent a quick turn-off phenomenon by providing a first and a second temperature detecting means for detecting the temperature of a pot and a cover, stopping a heating means, when a first temperature detecting means reaches a prescribed temperature, and operating a heating restarting means until a second temperature detecting means reaches the prescribed temperature, when the means becomes the prescribed temperature or below. CONSTITUTION:When a first temperature detecting means 3 detects a fact that the temperature of a pot 1 reaches a prescribed boiling maintaining process end temperature t1, a signal is outputted by a heating stopping means 5, and the heating of a heating means 2 is suspended. Thereafter, when the temperature becomes a prescribed temperature t2 or below, heating is restarted by a heating restart means 6. This control is effective only until a second temperature detecting means 4 embedded in a cover detects a prescribed temperature phi1 and a boiling maintaining process is started, and during the subsequent boiling maintaining process, rice becomes pasty gradually by absorbing water and water in the pot is consumed, and when a first temperature detecting means 3 detects a fact that its temperature reaches the prescribed temperature t1, the boiling maintaining process is finished and shifted to a steaming process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker mainly used at home.

[0002]

2. Description of the Related Art In recent years, needs for diversification and sophistication of consumers' tastes have become stronger, and rice cookers controlled by a microcomputer have become popular in order to cook more delicious rice.

Conventionally, the rice cooking process of this type of rice cooker is generally as shown in FIG. During the rice cooking process, water absorption of rice during the cooking process and the boiling maintenance process,
When the gelatinization is performed and the water in the pot is not absorbed by the rice, the temperature of the pot rises sharply, and when it reaches a predetermined temperature, the boiling maintaining process is completed and the steaming process is started. If the temperature of the pot exceeds the predetermined boiling maintenance stroke end temperature in the stroke before the boiling maintenance stroke, the rice cooking is finished and the heat retention stroke is started.

[0004]

However, in such a conventional rice cooker, when the convection of the water in the pan is hindered during the cooking process due to the quality of the rice, only a part of the rice is abruptly increased. When the temperature of the pan rises sharply and exceeds the predetermined boiling maintenance process end temperature, the rice will be cooked at that point even though the rice has not yet gelatinized, There was a problem that the so-called "premature cutting phenomenon" occurred.

The present invention solves the above-mentioned conventional problems. In the cooking process, even if the temperature of the pan exceeds a predetermined boiling maintaining process end temperature, the rice is not finished and the rice is cooked normally. It aims at providing the rice cooker which can be.

[0006]

In order to achieve this object, the rice cooker of the present invention is a pot having a lid on the top for putting rice cooked, a heating means for heating the pot, and detecting the temperature of the pot. The first temperature detecting means, the second temperature detecting means for detecting the temperature of the lid, and the fact that the first temperature detecting means has reached a predetermined temperature (t1) higher than the boiling temperature since the start of rice cooking. The heating stop means that detects and outputs a stop signal to the heating means, and the heating means when the temperature detected by the first temperature detection means after the stop signal is output is equal to or lower than a predetermined temperature (t2 <t1). And a control means for controlling the heating resuming means to operate from the start of rice cooking until the second temperature detecting means reaches a predetermined temperature. is there.

[0007]

With this configuration, the temperature of the pan rises rapidly during the cooking process, and the temperature exceeds the predetermined boiling temperature (t).
When the temperature reaches 1), the temperature detecting means for detecting the temperature of the lid detects the predetermined temperature and does not finish the rice cooking until the boiling maintaining process is started, and the heating is performed at the predetermined temperature (t2 <t1) or more. Is stopped, and heating is restarted at a predetermined temperature (t2 <t1) or lower, which is repeated. By controlling to restart heating after stopping this heating, the temperature of the pan is not only lowered to the level of normal rice cooking to heat it again, but it also stimulates the convection in the pan and restores the convection that has stagnated to normal. There is also the effect. Then, after a lapse of a predetermined time after entering the boiling maintaining process, the above control is not performed and normal rice is cooked, so that convection of water in the pot is prevented due to the quality of rice in the cooking process. Even if the rice is not gelatinized yet and the temperature of the pan suddenly rises and exceeds a predetermined temperature, the rice can be cooked and the rice can not be cooked.

Further, since the heating stop time is long enough not to affect the temperature rise of the cooked rice in the pan so much, it does not adversely affect the quality of the cooked rice, and normally cooks delicious rice. be able to.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a rice cooker according to an embodiment of the present invention, in which a heating means 2 for heating a pan 1 and a first temperature detecting means 3 for detecting the temperature of the pan 1 are provided. The second temperature detecting means 4 for detecting the temperature of the lid, and the first temperature detecting means from the start of rice cooking to a predetermined temperature (t1) equal to or higher than the boiling temperature
The temperature detected by the first temperature detecting means after the output of the stop signal is detected as the predetermined temperature (t2 <t1).
If it is the following, the heating resuming means 6 which outputs an operation signal to the heating means 2 and the heating resuming means are controlled to operate from the start of rice cooking until the second temperature detecting means reaches a predetermined temperature. And the control means 7.

FIG. 2 is a sectional view of the rice cooker,
The first temperature detecting means 3 for detecting the temperature of the pot 1 is composed of a temperature resistance element for converting the amount of change in temperature into a resistance value, is configured to move up and down, and is arranged in contact with the bottom surface of the pot 1. ing. The second temperature detecting means 4 for detecting the temperature of the lid is also composed of a similar temperature resistance element and is embedded near the inner surface of the lid. A micro computer (not shown) including a control means 7, a heating stop means 5 for outputting a heating stop signal, and a heating restart means 6 for outputting an operation signal is incorporated in the circuit board 8 and is provided at the bottom of the main body 9. It is installed. Figure 3
Shows the relationship between the temperature and time when cooking rice, when the rice is cooked normally and when the pot temperature rises rapidly (early cuts) during the cooking process.

In the rice cooker configured as described above,
The operation when cooking rice will be described. First, pot 1
With the rice and water in the pot, the pot 1 is placed as shown in FIG. When rice cooking is started, as shown in FIG. 3, the process of absorbing water for a certain period of time is followed by the cooking process, and the temperature of the pot gradually rises during the cooking process, and the water absorption and gelatinization of the rice begins. In the normal case, sufficient convection occurs in the pot, so that the temperature of the rice and water rises evenly, and the second temperature detecting means 4 embedded in the lid detects a predetermined temperature φ1, the boiling maintenance process. Then, the water absorption and gelatinization of the rice proceeds further, and the water in the pot disappears, and the temperature of the pot 1 rises sharply. When the first temperature detecting means 3 detects that the temperature has reached the predetermined temperature t1, the boiling maintaining process is ended and the steaming process is started. However, if the convection of water in the pan is blocked due to problems such as rice quality (crushed rice, slaughtered rice, etc.),
During the cooking process, only part of the rice is rapidly heated and gelatinized, so that there is no water in that part and the pot temperature may rise sharply. If the first temperature detection means 3 detects that the temperature of the pot 1 has reached the predetermined boiling maintenance stroke end temperature t1, the heating stop means 5 outputs a heating stop signal and the heating is interrupted. After the output of the stop signal, when the temperature detected by the first temperature detecting means becomes equal to or lower than the predetermined temperature t2, the heating restarting means 6 restarts the heating. While heating is stopped, the temperature of the pan 1 drops to near the normal temperature, and when heating is restarted, the convection of the water in the pan is restored, and after that, normal rice cooking is continued and the case where the convection is suspended Since the temperature has not been increased, the temperature of the pan may suddenly rise again when heating is restarted. In the latter case,
When the first temperature detection means 3 detects again that the temperature of the pot 1 has reached the predetermined temperature t2, the operation of restarting the heating after stopping the heating is repeated as many times as described above. The temperature of the rice and water in the pan rises in due course, but this control is performed during the cooking process, that is, after the cooking process is started, the second temperature detecting means 4 embedded in the lid has a predetermined temperature. Is effective only until the temperature of φ1 is detected and the boiling maintaining process is started, and during the subsequent boiling maintaining process, the water absorption gelatinization progresses and the water in the pot disappears, and the first temperature detecting means When it is detected that 3 has reached the predetermined temperature t1, the boiling maintaining process is ended, the steaming process is performed, and the rice cooking operation is completed. As shown in FIG. 3, even when the temperature of the pan rises to reach a predetermined cooking end temperature in the cooking process, the rice cannot be cooked due to "premature cutting" by controlling the heating as described above. The problem is solved.

[0013]

As described above, the rice cooker of the present invention has a pot having a lid on the top for holding cooked rice, heating means for heating the pot, and first temperature detecting means for detecting the temperature of the pot. And a second temperature detecting means for detecting the temperature of the lid, and detecting that the first temperature detecting means has reached a predetermined temperature (t1) equal to or higher than the boiling temperature since the start of rice cooking, and the heating means. Heating stop means for outputting a stop signal to the heating means, and if the temperature detected by the first temperature detecting means after the stop signal is output is equal to or lower than a predetermined temperature (t2 <t1), the heating means 2 outputs an operation signal. It is composed of a resuming means 6 and a control means for controlling the heating resuming means to operate from the start of rice cooking until the second temperature detecting means reaches a predetermined temperature. With this configuration, even when the temperature of the pan rises sharply during the cooking process of the rice and reaches the predetermined boiling maintenance process end temperature, the rice cooker does not finish cooking and continues to cook rice normally. It is possible to provide an excellent rice cooker.

[Brief description of drawings]

FIG. 1 is a block diagram of a rice cooker according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a rice cooker according to an embodiment of the present invention.

FIG. 3 is a graph showing the relationship between rice cooking temperature and time by the rice cooker of one embodiment of the present invention.

FIG. 4 is a graph showing the relationship between rice cooking temperature and time with a conventional rice cooker.

[Explanation of symbols]

 1 Pan 2 Heating Means 3 First Temperature Detection Means 4 Second Temperature Detection Means 5 Heating Stop Means 6 Reheating Means 7 Control Means

Continuation of the front page (72) Inventor Yasuhiko Tanaka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A pot having a lid on the top for putting cooked rice, heating means for heating the pot, first temperature detecting means for detecting the temperature of the pot, and second for detecting the temperature of the lid. And a heating stop means for detecting that the first temperature detection means has reached a predetermined temperature (t1) higher than the boiling temperature from the start of rice cooking and outputting a stop signal to the heating means. After the stop signal is output, when the temperature detected by the first temperature detecting means becomes a predetermined temperature (t2 <t1) or less, a heating resuming means that outputs an operation signal to the heating means, and the second temperature from the start of rice cooking. A rice cooker constituted by control means for controlling the heating restart means to operate until the detection means reaches a predetermined temperature.