JPH0795977B2 - Electric rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electric rice cooker that includes pan heating means for heating a pan and controls rice cooker heater input to cook rice.

(Prior Art) In recent years, in this type of electric rice cooker, the input of the rice-cooking heater as a pot heating means is controlled by an electronic circuit to prepare a rice-cooking menu for various courses such as white rice, brown rice, cooked rice, and porridge It is becoming possible to choose.

The general structure of such an electric rice cooker is shown in FIG.
1 is a rice cooker body, and this rice cooker body 1 is an outer frame 2 and an inner frame 3
The rice cooking heater 4 and the temperature detector 5 are provided at the bottom of the inner frame 3, and the temperature detector 5 is provided at the bottom of the outer frame 2.
An electronic circuit unit 6 for controlling the input of the rice cooking heater 4 based on the temperature detection information and the like is provided. And the pot 7 is housed in the inner frame 3 so that it can be inserted and removed freely.
The opening at the upper end of is closed by the lid 8.

For example, when cooking white rice, the pan 7 is taken out from the inner frame 3, the necessary amount of washed white rice and a predetermined amount of water according to the amount of the white rice are stored in the pan 7, and then the pan is cooked. 7 is inserted into the inner frame 3, and the opening is closed by the lid 8.
In this state, a start switch (not shown) is turned on manually or by a timer. In response to this, the input to the rice cooking heater 4 is controlled via the electronic circuit unit 6, and the rice is cooked through the rice cooking process shown in FIG.

The rice cooking process shown in FIG. 5 shows the relationship between the temperature change of the pan with the passage of time and the input state of the rice cooking heater. First, the hot water is cooked according to the turning on of the start switch. In the process of hot water cooking, the control of 20 ″ off-40 ″ on is repeated four times for the rice cooking heater 4, and then the control of 5′off−40 ″ on-5′20 ″ off is performed. By such control, the water in the inner pot is heated to an appropriate temperature, and the water is sufficiently permeated into the rice grains. In addition, "" represents a second of time, and "represents a minute.

After such hot water cooking is performed, a substantial rice cooking process is started, and first, the rice cooking heater is continuously energized. Due to this energization, the temperature of the pan gradually rises, and the amount of rice in the pan is detected in the middle of that, that is, while the temperature of the pan rises from 70 ° C to 80 ° C. This rice amount detection is done when the pot temperature is 70 ℃ to 80 ℃
It is calculated from the time T required to rise to. That is, when the amount of rice is small, the time T is short, and when the amount of rice is large, the time T is long. Therefore, it is determined that the amount is small when T <55 ″ and large when T ≧ 55 ″. .

Boiling detection is started when the temperature of the pan reaches 94 ° C. This boiling detection is carried out by utilizing the fact that when the water in the pan begins to boil, the temperature rise of the pan is suppressed by the latent heat of vaporization. In other words, from Chino P _o time since the pot has reached 94 ℃,
When the amount of rice is small, after 60 ″, when the amount is large, after 2′20 ″, the temperature of the pot rises below 5deg. It is judged to have boiled.

After such boiling detection is performed, the rice cooking heater is controlled to 60 ″ off−60 ″ on (stable control), whereby the boiling of water in the pan continues stably.

By continuing such boiling, the water content in the pan decreases, and when the temperature rise of the pan starts again, 20 ″ for the rice heating heater.
It is switched to off-10 ″ on control (cooking control), the temperature of the pan rises by such control, and the rice is cooked when it reaches 120 ° C. Then, when the inner pan is boiling water. The temperature is maintained at about the same temperature as the above, the rice inside is made uneven, and after this unevenness, the temperature is kept warm via the warming heater 9.10 shown in FIG.

(Problems to be solved by the invention) Although white rice is cooked by such a heating pattern, rice cooked with white rice is selected more frequently on a daily basis than rice cooked menus such as brown rice, cooked rice and porridge. However,
The heating pattern is always constant, so that only the cooked rice can be obtained.

From the point of taste, soft, hard, or charred rice may be preferred, but as mentioned above, it is difficult to meet that request because rice can only be cooked with a certain heating pattern. Met. If you are trying to obtain strong, soft or hard rice, you can meet the expectation to some extent by adjusting the amount of water added to the pan, but such a means is There are problems such as spillage and leaving the core in cooked rice.

The present invention has been made in view of such a point, and an object thereof is to prepare an electric rice cooker capable of selecting a cooked state according to preference when cooking rice. To provide.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve such an object, the present invention detects a pot for cooking rice, a pot heating means for heating the pot, and a temperature of the pot. It is equipped with a temperature detecting means and a control means for controlling the amount of pot heating by the pot heating means according to the temperature of the pot, and when only a predetermined amount of rice and water before the start of rice cooking are accommodated to cook white rice, Providing a means for selecting the cooked state of rice to cook, and pre-operating this cooked rice means before starting to cook rice, through the control means, from the start of boiling until the start of the pot It is characterized in that the heating amount of the pot can be switched by the heating means.

(Function) Increasing the total power consumption of the pan heating means after the start of boiling when cooking white rice cooks rice that is moderately charred and harder than the standard, and vice versa Decreasing the total power consumption of the heating means cooks rice that is softer than the standard. In any case, since the total power consumption of the pot heating means is switched after the start of boiling, the cooked rice is moderately sticky and has no core.

(Example) Hereinafter, the Example of this invention is described.

In FIG. 3, reference numeral 11 denotes an operation panel provided on the front surface of the rice cooker body 1, and various display portions for displaying the current time, the set state of the timer, the rice cooking menu, etc. on the operation panel 11.
12… and various operation keys for time setting, reservation setting, rice cooking menu selection, cancellation, start 13…
Further, when rice is cooked, an operation dial 14 is provided as a means for separately sorting white rice for selecting a standard cooked state as standard, strong (hard) or weak (soft).

When the operation dial 14 is operated to cook the white rice in the standard course, the rice is cooked according to the heating pattern shown in FIG. Similarly, in the case of the strong course, the heating pattern shown in FIG. 1 is used, and in the case of the weak course, the heating pattern shown in FIG. 2 is used.

Regarding the strong heating pattern (Fig. 1), in this case, the heating pattern of the standard course is the same as the heating pattern of the standard course from the hot water cooking to the boiling heating and the control to the heating control. In the raising control section, the rice cooking heater is continuously energized throughout the section. Also,
The heating pattern for the weak course (Fig. 2) is the same as the heating pattern for the standard course described above, from the time of boiling water to the start of boiling, but in the stable control section after boiling starts. The rice cooking heater as a pot heating means is narrowed to the input state of 60 ″ off−30 ″ on, and then switched to the input state of 20 ″ off−10 ″ on in the section for cooking control. In this weak course, the cooking temperature is 115
It is set to ℃. In addition, the amount of rice detected in the strong course is 5 deg or less / 5 ′, 20 ″ is large, 5 deg or less / 60 ″ is small, and in the weak course is 5 deg or less / 2 ′, 5 deg or less / 6
It is detected as a small amount at 0 ″.

In order for the cooked rice to be delicious, it must have a suitable stickiness regardless of whether it is hard or soft. One of the factors that make rice sticky during the cooking process is the speed at which it boils. In other words, if the speed until boiling is slow, the time from the gelatinization start temperature (55 to 70 ° C) of rice to boiling will be longer, so compared to the time of complete boiling (98 ° C or higher),
The α-forming energy becomes small between (55 ~ 70 ° C) and 98 ° C (because the energy is used for water heating), the energy is insufficient for converting the whole rice into α, and only the rice surface has α Then, if it continues to boil from this state, only the peripheral surface of the rice becomes excessively alpha, resulting in so-called sticky and crumbled rice. Ideally, the time from the start of substantial rice cooking to boiling is 5 to 15 minutes, and thus, in any of the standard, high-strength, and low-dose courses, until boiling starts after hot water is cooked. During this period, the rice heating heater is continuously energized to keep the time until boiling constant.

In the strong course, the rice cooking heater is continuously energized even in the cooking control section to increase the power consumption compared to the standard course, which causes the rice to have an appropriate charcoal burn and the rice surface. The evaporation of free water attached to the
Hard rice with stickiness but low water content is cooked. On the other hand, in the weak course, the power consumption of the rice cooker is reduced in the stable control section compared to the standard course, and the cooking temperature is 115 ° C, which is lower than the standard course.
Because of this, the amount of evaporation is suppressed, and rice with a relatively high water content, which is almost non-sticky, is cooked.

[Effects of the Invention] As described above, according to the present invention, it is possible to select and cook hard rice that is appropriately charred or conversely soft rice according to taste. And in either case,
Since the total power consumption of the pot heating means is switched after the start of boiling, the cooked rice is moderately sticky and has no core.

[Brief description of drawings]

FIG. 1 is a graph showing a rice cooking process when cooking hard rice with an electric rice cooker according to an embodiment of the present invention, and FIG. 2 is a graph showing a rice cooking process when similarly cooking soft rice. Fig. 3 is a front view of an operation panel provided in the electric rice cooker, Fig. 4 is a sectional view showing a general structure of the electric rice cooker, and Fig. 5 is a graph showing a standard rice cooking process. Is. 4 ... rice cooking heater, 5 ... temperature detector, 6 ... electronic circuit unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Morio Asahi 4-chome, 21-chome, Yoshihara-cho, Nishi-ku, Nagoya-shi, Aichi Prefecture Nagoya Plant, Toshiba Corp. Home Appliances Technology Laboratory, Toshiba Corporation Yokohama Office (72) Inventor Tatsuya Nakagawa 33 Shinisogo-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Audio / Video Engineering Co., Ltd. Isogo Factory (72) Inventor Yukichi Abe Kamo-shi, Niigata Prefecture Oji Gosuda 2570 Address 1 Toshiba Heater Co., Ltd. (72) Inventor Koichi Tamaki Koji City Niigata Pref. 2570 Gosuda Within Toshiba Heater Co., Ltd. (72) Satoru Tsukada 2570 Gosuda Kamo City Niigata Pref. Address 1 In Toshiba Heat Appliance Co., Ltd. (72) Inventor Hiroaki Kawaguchi 2570 Gosuda, Kamo City, Niigata Prefecture Place 1 In Toshiba Heat Appliance Co., Ltd. (72) Inventor Koichi Hasegawa 4-21, Yoshihara-cho, Nishi-ku, Nagoya-shi, Aichi Prefecture, Nagoya Plant, Toshiba Corporation (56) Reference JP-A-63-197414 (JP, A) JP Flat 1-227720 (JP, A) JP-A-1-308509 (JP, A)

Claims (1)

[Claims] 1. A pot for cooking rice, a pot heating means for heating the pot, a temperature detecting means for detecting the temperature of the pot, and a control means for controlling the pot heating amount by the pot heating means according to the temperature of the pot. It is equipped with, and when the rice is cooked with a predetermined amount of rice and water before the rice is cooked, it is equipped with a means for selecting the cooked rice to select the cooked state. An electric rice cooker characterized by enabling the pan heating amount to be switched by the pan heating device from the start of boiling until the start of the steaming operation by previously operating in advance through the control device.