JP2995982B2 - rice cooker - Google Patents

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, there has been a growing need for diversification and sophistication of consumer preferences, and rice cookers controlled by a microcomputer have become widespread in order to cook more delicious rice.

Conventionally, a rice cooking process of this type of rice cooker is generally as shown in FIG. In the rice cooking process, water absorption of rice during the cooking process and the boiling maintenance process,
When the gelatinization is carried out and the water in the pot is not absorbed by the rice, the temperature of the pot rises rapidly, and when the temperature reaches a predetermined temperature, the boiling maintaining process is finished and the steaming process is started. If the temperature of the pot exceeds a predetermined temperature at the end of the boiling maintenance process in a process before the boiling maintenance process, rice cooking is terminated and a warming process is started.

[0004]

However, in such a conventional rice cooker, when the convection of water in the pot is hindered during the cooking process due to the quality of rice or the like, only a part of the rice is sharply reduced. When the temperature of the pot rises sharply and exceeds the predetermined boiling maintenance process end temperature, the rice cooking is actually terminated at that point in spite of the fact that the rice has not yet gelatinized, However, there is a problem that a so-called premature break phenomenon occurs.

[0005] The present invention solves the above-mentioned conventional problems. In the cooking process, even if the temperature of the pan exceeds a predetermined boiling maintenance process end temperature, rice cooking is not terminated, and rice is usually cooked. It is an object of the present invention to provide a rice cooker capable of performing a rice cooker.

[0006]

In order to achieve this object, a rice cooker according to the present invention comprises a heating means for heating a pot, a first temperature detecting means for detecting the temperature of the pot, and an inner surface of the lid.
And a second temperature detecting means for detecting a temperature near, 炊
After the start of the rice, the detected temperature of the second temperature detecting means becomes a predetermined value.
To reach the boiling maintenance process
Before the boiling maintaining step, the first temperature detecting means
Before reaching a predetermined temperature (t1) above the boiling temperature.
The heating means is stopped and the temperature is set to a predetermined temperature.
When (t2 <t1) or less, the heating means is operated .

[0007]

According to this configuration, the temperature of the pan rises rapidly during the cooking process and the temperature (t) exceeds a predetermined boiling temperature.
When the temperature reaches 1), the temperature detection means for detecting the temperature near the inner surface of the lid detects the predetermined temperature and does not terminate the rice cooking until the boiling maintenance process is started, and the predetermined temperature (t2 <t)
1) Above this, heating is stopped and a predetermined temperature (t2 <t1)
In the following, repeating heating is repeated. By controlling the heating to be resumed after this heating is stopped, not only is the temperature of the pot lowered to the level of ordinary rice cooking and heating is performed again, but also the convection in the pot is stimulated and the convection in the pot is returned to normal. There is also an effect. Then, after a predetermined time has elapsed since the start of the boiling maintenance process, since the above-described control is not performed and normal rice is cooked, convection of water in the pot is hindered in the cooking process due to rice quality and the like, Actually, even when the temperature of the pot rises sharply and exceeds a predetermined temperature even though the rice has not yet been gelatinized, rice cooking is continued, and it is possible to prevent a premature break phenomenon that rice cannot be cooked.

[0008] In addition, since the heating stop time is long enough to not significantly affect the temperature rise of the cooked rice in the pot, it does not adversely affect the quality of the cooked rice, and usually cooks delicious rice. be able to.

[0009]

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 one embodiment of the present invention, in which a heating means 2 for heating a pot 1, a first temperature detecting means 3 for detecting the temperature of the pot 1, and Inside the lid
The second temperature detecting means 4 for detecting the temperature near the surface and the heating means 2 detecting that the first temperature detecting means has reached a predetermined temperature (t1) equal to or higher than the boiling temperature from the start of rice cooking. Heating stop means 5 for outputting a stop signal; and heating for outputting an operation signal to the heating means 2 if the temperature detected by the first temperature detecting means after the output of the stop signal is equal to or lower than a predetermined temperature (t2 <t1). The heating means is constituted by restart means 6 and control means 7 for controlling the heating restart means to operate from the start of rice cooking until the second temperature detecting means reaches a predetermined temperature.

FIG. 2 shows 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 a change in temperature into a resistance value, is configured to move up and down freely, and is disposed in contact with the bottom surface of the pot 1. ing. The second temperature detecting means 4 for detecting the temperature near the inner surface of the lid also includes the same temperature resistance element, and is embedded near the inner surface of the lid. Microcomputer (not shown) including control means 7, heating stop means 5 for outputting a heating stop signal, and heating restart means 6 for outputting an operation signal
Is mounted on the circuit board 8 and attached to the bottom of the main body 9. Fig. 3 shows the relationship between temperature and time when cooking rice.
This shows a case where rice is cooked normally and a case where the pot temperature rises rapidly (cuts out quickly) during the cooking process.

In the rice cooker configured as described above,
The operation when cooking rice will be described. First, pan 1
After the rice and water are put in the pot, the pot 1 is placed as shown in FIG. When rice cooking is started, as shown in FIG. 3, the cooking process starts after a process of absorbing water for a certain period of time. During the cooking process, the temperature of the pot gradually increases, and the rice begins to absorb and gelatinize. In the normal case, sufficient convection occurs in the pot, so that the temperature of rice and water rises evenly, and when the second temperature detecting means 4 embedded in the lid detects the predetermined temperature φ1, the boiling maintaining process is performed. Then, the water absorption in the rice proceeds and the water in the pan disappears, and the temperature of the pan 1 rises rapidly. When the first temperature detecting means 3 detects that the temperature has reached the predetermined temperature t1, the boiling maintaining process is completed and the process shifts to the steaming process. However, if problems such as rice quality (crushed rice, milled rice, etc.) prevent the convection of water in the pot,
During the cooking process, only a portion of the rice is rapidly heated and gelatinized, so that there is no water and the temperature of the pot may rise rapidly. If the first temperature detecting means 3 detects that the temperature of the pan 1 has reached the predetermined boiling maintenance stroke end temperature t1, the heating stop signal is output by the heating stop means 5, and the heating is interrupted. After the stop signal is output, when the temperature detected by the first temperature detecting unit becomes equal to or lower than the predetermined temperature t2, heating is restarted by the heating restarting unit 6. During the stop of the heating, the temperature of the pot 1 drops to near the normal temperature, and when the heating is resumed, the convection of the water in the pot is restored, and thereafter, the normal cooking is continued, and the convection is recovered with a delay. When the heating is resumed because the heating is not performed, the temperature of the pot may suddenly rise again. In the latter case,
When the first temperature detecting means 3 detects that the temperature of the pot 1 has reached the predetermined temperature t2 again, the operation of stopping the heating and then restarting the heating is repeated as many times as described above. In the meantime, the temperature of the whole rice and water in the pot rises, but this control is performed during the cooking process, that is, when the second temperature detecting means 4 embedded in the lid is in a predetermined state after starting the cooking process. Is effective only until the temperature .phi.1 is detected and the boiling maintenance process is started. During the subsequent boiling maintenance process, the water in the pot disappears due to the water absorption and gelatinization of the rice, 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 pot rises during the cooking process and reaches a predetermined rice finishing temperature, the rice is not cooked due to “early cut” by controlling the heating as described above. This solves the problem.

[0013]

As described above, the rice cooker according to the present invention comprises a heating means for heating the pot, a first temperature detecting means for detecting the temperature of the pot, and a second means for detecting the temperature near the inner surface of the lid. A second temperature detecting means, and the second temperature detecting means after the rice cooking is started.
Detects when the temperature detected by the informing means has reached a predetermined value and boils
Move to the maintenance step and before the boiling maintenance step
Means that the first temperature detecting means has a predetermined temperature equal to or higher than the boiling temperature.
When the temperature (t1) is reached, the heating means is stopped.
In addition, the temperature becomes lower than a predetermined temperature (t2 <t1).
For example, by operating the heating means , even when the temperature of the pot rapidly rises during the cooking process of rice and reaches a predetermined boiling maintenance process end temperature, the rice cooking is continued without ending. Thus, it is possible to provide an excellent rice cooker which can cook rice normally.

[Brief description of the drawings]

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

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

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

FIG. 4 is a characteristic diagram showing a relationship between rice cooking temperature and time in a conventional rice cooker .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pot 2 Heating means 3 First temperature detecting means 4 Second temperature detecting means 5 Heating stop means 6 Reheating means 7 Control means

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasuhiko Tanaka 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-60-241413 (JP, A) JP-A-63- 145612 (JP, A) Japanese Utility Model Showa 64-33930 (JP, U) Japanese Utility Model Utility Model No. 2-119109 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47J 27/00 103 A47J 27/00 109

Claims (1)

(57) [Claims] And 1. A heating means for heating the pot, a first temperature detecting means for detecting the temperature of the pan, and a second temperature detecting means for detecting the <br/> temperature near the inner surface of the lid Prepare and start cooking rice
Later, the temperature detected by the second temperature detecting means reaches a predetermined value.
And then proceed to the boiling maintenance process.
Prior to the boiling maintaining step, the first temperature detecting means boils.
When the temperature reaches a predetermined temperature (t1) equal to or higher than the temperature, the heating is performed.
When the means is stopped, the temperature becomes the predetermined temperature (t2
<T1) A rice cooker obtained by operating the heating means if the following conditions are satisfied .