JPH0632018Y2 - rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a rice cooker that includes heating means for heating a container for cooking rice and controls the input of the heating means to cook rice.

(Prior Art) A general structure of such a rice cooker is shown in FIG. 5, 1 is a main body having an inner case 2 and an outer case 3, 4 is a lid, and 5 is inside the inner case 2. Container for cooking rice, 6
Is a rice cooking heater serving as heating means provided at the bottom of the inner case 2, 7 is a heat retaining heater serving as heating means provided on the side surface of the inner case 2 and the inner surface of the lid 4, and 8 is elastically pressed against the outer bottom of the container 5. The temperature sensor 9 for detecting the temperature of the container 5 is provided inside the cup-shaped heat-sensitive section. Reference numeral 10 denotes an electronic circuit unit that controls the inputs of the rice cooking heater 6 and the warming heater 7 based on the temperature detection information from the temperature sensor 9 and the like, and is provided at the bottom of the outer case 3. Further, a container 5 is detachably accommodated in the inner case 2, and an upper opening of the container 5 is closed by a lid 4.

Then, for example, in the case of cooking white rice, the container 5 is taken out from the inner case 2, a required amount of washed white rice and a predetermined amount of water corresponding to the amount of this white rice are stored in the container 5, and then the container 5 is inserted into the inner case 2, the opening is closed by the lid 4, and 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 6 is controlled via the electronic circuit unit 10, and the rice is cooked through a predetermined process shown in FIG.

FIG. 6 shows the relationship between the temperature change of the container 5 with the passage of time and the input state of the rice cooking heater 6. First, hot water cooking is performed for 15 minutes according to the turning on of the start switch. In this hot water cooking process, Japanese Patent Laid-Open No. 52-66
It is controlled to maintain a constant temperature of about 45 ° C., which is slightly lower than the gelatinization temperature of rice, regardless of the capacity, as known from Japanese Patent No.
% (For example, 0N-0FF-ON-OFF at 1000W input
Is carried out for 15 minutes, the water in the container 5 is heated to an appropriate temperature by such control, and the water is sufficiently immersed in the rice grains. And, the container temperature at the time of completion of hot water cooking is constant regardless of the capacity.

After such hot water cooking is performed, the process shifts to the substantial rice cooking process.
It is energized by inputting%. Due to this energization, the temperature of the container 5 gradually rises.
The capacity of the container 5 is detected while the temperature rises to ° C. This capacity detection is calculated from the time T required for the temperature of the container 5 to rise from 70 ° C to 80 ° C. That is, when the amount of rice is large, the time T becomes long. Therefore, for example, when T <55 ″, it is determined that the amount is small and when T ≧ 55 ″, the amount is large.

The boiling detection is started when the temperature of the container 5 reaches a predetermined temperature, for example, 94 ° C. This boiling detection is performed by utilizing the fact that when the water in the container 5 starts to boil, the temperature rise of the container 5 is controlled by the latent heat of vaporization. That is, when the amount of rice is small from the time when the container 5 reaches 94 ° C., 60 ″ has elapsed, and when the amount is small, 2′20 ″, the temperature rise of the container 5 is 5 deg or less. The state is detected, and it is determined that the water has boiled in the container 5 by this detection.

After such boiling detection is performed, the rice cooker 6
On the other hand, for example, 50% (500 W) input control is performed, whereby the boiling of water in the container 5 continues stably.

Due to the continuation of such boiling, the water content in the container 5 decreases,
The rice cooking process is completed when the temperature rise of the container 5 starts again and reaches 120 ° C.

After such a rice cooking process, the 15-minute Murashi process is started. This steaming process is for the rice cooker 6
0% -ON-OFF-ON-OFF- with 100% input
The ON-OFF control is performed for 15 minutes, and by such control, the container 5 is maintained at a temperature almost equal to that when water is boiling, and the rice in the inside is uneven.

Further, after the purging process, the heat is maintained by the heat-retaining heater 7.

(Problems to be solved by the invention) In this way, in the hot water cooking process, heating control is performed so that the container temperature is maintained at the same temperature regardless of the capacity, and after that, when the rice cooking process starts, heating is performed with the same heating amount regardless of capacity. Since it is controlled, the time from the start of the rice cooking process to the boiling detection time at which the water in the container boils varies depending on the capacity, and the time required for boiling becomes longer than the small capacity. When the time until boiling becomes long, it takes time for convection of heat in the container, and there are temperature differences in the upper, middle, and lower parts, which causes uneven cooking, that is, variation in water content, and conversely, when the time until boiling becomes shorter, There is little temperature difference in each part inside, and the uneven cooking becomes small. Therefore, there is a problem that the cooked state is different between the large capacity and the small capacity, and it is not possible to obtain the cooked rice of the same cooked state regardless of the capacity.

On the other hand, in Japanese Utility Model Laid-Open No. 63-52525, the cooked rice amount detecting means determines the amount of cooked rice based on the constant temperature detected by the temperature detecting element after the completion of the preheating process which is a hot water cooking process. There is disclosed a rice cooker that controls rice cooking while varying the 100% energization time for the rice cooking heater after the preheating process according to the amount. In this case, the heating amount after starting the rice cooking process can be changed according to the capacity, but if a rice cooking amount that is different from the actual amount is mistakenly detected, it will boil after starting the main cooking, which has the highest heating amount during the entire process. During that time, the amount of heating changes greatly, and as a result, there is a risk that rice will be cooked due to remarkably inappropriate heating.

Therefore, the present invention solves the above problems and can obtain almost the same cooked state regardless of the capacity, and even if a different rice cooking capacity is mistakenly detected, the heating does not become extremely inappropriate. The purpose is to provide a container.

[Configuration of the Invention] (Means for Solving the Problem) The present invention is a container 5 for cooking rice, a heating unit 6 for heating the container 5, and a temperature detecting unit 12 for detecting the temperature of the container 5.
And the temperature detecting means 12 in the first hot water cooking process.
The rice cooking capacity detecting means for detecting the rice cooking capacity based on the temperature change of the container temperature detected by the above, and the rice cooking capacity based on the rice cooking capacity detected by the rice cooking capacity detecting means in the second hot water cooking step after the first hot water cooking step. The control means 13 variably controls the heating amount by the heating means 6 and controls the heating amount by the heating means 6 to the same level until the boiling point is detected in the subsequent main rice cooking process.

(Function) The present invention detects the capacity in the first hot water cooking process and variably controls the heating amount of the second hot water cooking process based on the detection result. The heating amount is small when the capacity is small and the heating amount when the capacity is large. By controlling to large, even if rice is cooked with the same heating amount until the boiling detection time in the subsequent main rice cooking process, the time from the start of rice cooking to boiling will be almost the same, regardless of the capacity.
Almost the same cooked state can be obtained.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. Since the whole structure of the rice cooker is the same as that of FIG. 5, the description thereof will be omitted, and the same parts will be described with the same reference numerals.

FIG. 1 is a block diagram, and 11 is an A / D converter that constitutes a temperature detecting means 12 together with the temperature sensor 9 and outputs a signal according to the detected temperature. 13 is the electronic circuit unit
As is well known, the CPU 14 is a control means composed of a microcomputer, and the control means 15 is a clock means 15 and a memory.
16, an input circuit 17, an output circuit 18, etc., and the signal from the operation unit 19 and the signal of the detected temperature of the container 5 are input to the CPU 14 via the input circuit 17 and output from the CPU 14 via the output circuit 18. Drive circuit 20 based on the generated control signal
The heaters 6 and 7 as heating means are driven and controlled by the display driving circuit 21 and the display unit 22 is driven and controlled by the display driving circuit 21. Further, the control means 13 holds a plurality of types of programs, and controls the driving of the rice cooking heater 6 and the warming heater 7 in accordance with the programs held therein. Further, the control means 13 is provided with a rice cooking capacity detecting means for detecting the rice cooking capacity by the temperature change of the container temperature detected by the temperature detecting means 12 in the first hot water cooking step, and the second after the first hot water cooking step. In the hot water cooking process, the heating amount by the heating unit is variably controlled based on the rice cooking capacity detected by the rice cooking capacity detecting unit, and the heating amount by the heater 6 is controlled to be the same until the boiling point is detected in the subsequent main rice cooking process. It has become.

The operation of the present invention configured as described above will be described with reference to FIGS.
It will be described with reference to the drawings.

First Figure 3, the fourth predetermined time as shown in FIG. T ₁ example 8
The first hot water cooking for one minute is performed with the same heating amount (step 1). In this first hot water cooking process, 20 "0FF-40" ON is controlled with 100% input to the rice cooking heater 6 three times repeatedly, and then the rice heating heater 6 is turned on for 5 minutes.
Continue the FF state, and complete the first hot water cooking process at the point P
₁ of the detected temperature t ₁ a first soaked cooking detected and a detection temperature t _max of the maximum temperature point P ₂ in the stroke (Step 2),
When the relationship between t ₁ and t _max is t ₁ ≧ t _max −1, the capacity is small, and t ₁
<T _max -1 is determined to be a large capacity (step 3).
In addition, "" represents a second of time and "" represents a minute.

After the first hot water cooking is performed, the process moves to the second hot water cooking process. In the second hot water cooking process, first, the second hot water cooking process is controlled for a certain time t _2, for example, 7 minutes. This is based on the detection result of the rice cooking capacity detection, and when the capacity is small, as shown in FIG. 3, 40 ″ 0N is performed once with 100% input to the rice cooking heater 6, and then the 0FF state of the rice cooking heater 6 is continued ( Step 4), when the capacity is large, as shown in FIG.
On the other hand, with 100% input, 40 ″ 0N and 20 ″ 0FF are repeated four times, after which the 0FF state of the rice cooking heater 6 is continued and the heating amount is controlled to be larger than the small capacity (step 5).

Then, in step 6, at the time point P ₃ when it is judged that the control of the second hot water cooking process is completed, the small and large capacity co-cooking heater 6 is continuously energized with 100% input as shown in FIG. 2 and FIG. Then, main rice cooking control is performed (step 7). After reaching the boiling point P ₄ (step 8), the rice cooking heater 6
The heating amount is reduced to 60 ″ 0FF and 60 ″ 0N are repeated (step 9), and after reaching the dry-up detection time point P ₅ (step 10), the rice cooking heater 6 is turned to 0FF and the unevenness process is started. (Step 11).

As described above, in the above embodiment, the capacity detection is performed in the first hot water cooking process, and the second detection is performed based on the detection result.
Variably controlling the heating amount of soaked cooked stroke of the small capacity heat amount small, since a large capacity has a large amount of heating, the temperature detected by the completion P ₃ of the second soaked cook stroke temperature small volume The large-capacity temperature t ₃ is higher than t ₂ . For this reason,
After that, if the rice is cooked with the same heating amount, the time required for boiling T _{0 in} a large capacity becomes short, the temperature difference between the various places in the container 5 at the time of a large capacity becomes small, and the unevenness of cooking becomes small, and at the same time the large capacity and the small capacity are mixed. Time required to boil between T ₀
Are substantially the same, and substantially the same cooked rice can be obtained.

Further, the variable control of the heater 6 according to the rice cooking capacity is completed during the second hot water cooking process in which the heating amount is relatively small, and the heating amount from the main rice cooking to the boiling detection thereafter is the detected rice cooking capacity. Since it does not change regardless of the size of the rice, even if the rice cooking capacity that is different from the actual one is erroneously detected, the fear that the heating will be significantly inappropriate is avoided.

Moreover, since the difference in cooking time between large capacity rice and small capacity rice is small, it is possible to accurately confirm the required rice cooking time in timer rice cooking.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the conditions for rice cooking capacity detection may be selected as appropriate.
Also, the capacity may be judged to be large, medium, small, etc., and the heating amount of the second hot water cooking process may be finely variably controlled based on the detection result, and the heating amount may be varied depending on 0N, 0FF of the heater or the energization rate. You can control it.

[Advantage of the Invention] The present invention is a container for cooking rice, a heating means for heating the container, a temperature detecting means for detecting the temperature of the container, and a container detected by the temperature detecting means in the first hot water cooking process. Rice-cooking capacity detecting means for detecting the rice-cooking capacity by temperature change, and heating by the heating means based on the rice-cooking capacity detected by the rice-cooking capacity detecting means in the second hot-cooking step after the first hot-cooking step. It is equipped with a control means that variably controls the amount and controls the heating amount by the heating means to the same point until the boiling point is detected in the main rice cooking process thereafter, and obtains substantially the same cooked state regardless of the capacity. It is possible to provide a rice cooker in which heating is not extremely inappropriate even when different rice cooking capacities are erroneously detected.

[Brief description of drawings]

FIG. 1 is a block diagram, FIG. 2 is a flow chart, FIG. 3 is a graph showing a process of small-capacity rice cooking control, FIG. 4 is a graph showing a process of large-capacity rice cooking control, and FIG. 5 is a general graph. FIG. 6 is an overall sectional view of the rice cooker, and FIG. 6 is a graph showing a process of general rice cooker control. 5 ... container 6 ... rice cooking heater (heating means) 12 ... temperature detecting means 13 ... control means (rice cooking capacity detecting means)

Claims (1)

[Scope of utility model registration request] 1. A container for cooking rice, heating means for heating the container, temperature detecting means for detecting the temperature of the container, and temperature of the container temperature detected by the temperature detecting means in the first hot water cooking process. The rice cooking capacity detecting means for detecting the rice cooking capacity according to the change, and the heating amount by the heating means is varied based on the rice cooking capacity detected by the rice cooking capacity detecting means in the second hot water cooking step after the first hot water cooking step. A rice cooker comprising: a control unit that controls the heating amount by the heating unit until the boiling is detected in the main rice cooking process thereafter.