JP3405214B2 - rice cooker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker mainly used at home. [0002] In recent years, consumer preferences have diversified, and the need for cooking more delicious rice has increased.
Electric rice cookers controlled by microcomputers have become mainstream. [0003] A conventional electric rice cooker will be described below. FIG. 4 is a graph showing the relationship between temperature, time, and power during a rice cooking process in a conventional electric rice cooker. As shown in FIG. 4, this rice cooking process is a water absorption process in which the temperature in the pot is raised to an appropriate temperature, water is absorbed in rice, a heating process in which the temperature in the pot is raised to a certain temperature to make the temperature uniform, Boiling and cooking process to determine the amount of rice in the pot at the same time, boiling maintaining process to maintain the boiling with the power according to the determined amount of rice until the water in the pot runs out, and to make the rice absorb and gelatinize, the amount of rice cooked And a steaming step of accelerating gelatinization with a power corresponding to the temperature. [0004] In the above steps, the rice cooking power can output high power only in the temperature raising step, and can output only the predetermined power W in the subsequent steps. [0005] However, in the above-mentioned conventional rice cooker, as in Japanese Patent Application Laid-Open No. 8-164066, only the temperature raising step is performed with high power, and the subsequent steps are heated with predetermined power W. Therefore, as the amount of cooked rice increases or as the power becomes lower, the power becomes insufficient, and the temperature in the pot is slowly increased, so that the grain collapse increases and a favorable taste cannot be obtained. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and rice is cooked by heating at a high power for a certain period of time from the temperature raising step to the cooking step or until the first temperature detecting means detects boiling. Regardless of the amount, the aim is to obtain a good-tasting rice with little breakage of the grains and good fire quality. [0007] In order to solve this problem, a rice cooker according to the present invention comprises a pot for storing an object to be cooked, heating means for heating the pot, and a first means for detecting boiling. Temperature detecting means, second temperature detecting means for detecting the temperature of the pan, power adjusting means capable of outputting at least three different electric powers to the heating means, and after starting the rice cooking, the water absorbing step with the first electric power W1 After performing , constant from heating process to cooking process
Time or until the first temperature detection means detects boiling
Good heating regardless of the amount of rice cooked by high power heating
In the subsequent heating step to obtain rice with a good taste, the second electric power W2 satisfying W2> W1 is output for a certain period of time T1, and then W2 is output.
2>W3> W1 is output as the third power W3 for a certain time T2, and a certain time T3 elapses from the start of the heating process to the cooking process, or the first temperature detecting means is operated during the certain time T3. When the boiling is detected, the heating means is continued by the fourth electric power W4 satisfying W3> W4 ≧ W1, passed through the boiling maintaining step, the steaming step, and the electric power adjusting means is controlled so as to end the rice cooking step. ing. [0008] With this configuration, the first power W
After completion of the water absorption process in step 1, the temperature rise process starts and W2>
The second power W2, which is W1, is input for a certain time T1. Thereafter, the third power W3 satisfying W2>W3> W1 is input for a certain time T2. Here, even when the amount of cooked rice is maximum, heat is applied so that the temperature rise is accelerated to some extent. When a certain time T3 elapses from the start of the heating process to the cooking process, or when the first temperature detecting means detects the predetermined temperature φ1, the subsequent processes are performed with the fourth power W4 satisfying W3> W4 ≧ W1. To continue. From the temperature-raising process to the cooking process, through the boiling process that maintains boiling until the water in the pot runs out and absorbs gelatinized rice, and the steaming process that promotes gelatinizing with power according to the amount of rice cooked Constant
Time or until the first temperature detection means detects boiling
By heating with high electric power, regardless of the amount of cooked rice, the collapse of the grains is small, and it is possible to obtain good-tasting rice with good fire quality. 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. Pot 1, heating means 2 for heating pot 1, and first temperature detecting means 3 for detecting boiling
A second temperature detecting means 4 for detecting the temperature of the pan 1, a power adjusting means 5 capable of outputting at least three different powers to the heating means 2, and an output of the first and second temperature detecting means 3, 4. And the control means 6 for controlling the power adjusting means 5 with the input as the input. FIG. 2 shows a sectional view of the rice cooker.
The pot 1 for holding the object to be cooked is placed above the heating means 2. As the heating means 2, an induction heating coil is provided.
The first temperature detecting means 3 for detecting boiling is disposed on the surface of the lid body 6 facing the cooked rice, and the second temperature detecting means 4 for detecting the temperature of the pan 1 is disposed in contact with the bottom of the pan 1. A signal is output to a control board 5 on which a computer is mounted. The control board 5 performs output such as power adjustment and heating control for various inputs. FIG. 3 shows the relationship between cooking time, temperature, and power. The operation of cooking rice in the rice cooker configured as described above will be described. First, the rice pan and the water are put in the pan 1, and the pan 1 is placed as shown in FIG. When rice cooking is started, as shown in FIG. 3, a water absorption step is performed with the first electric power W1. The water absorption process takes a certain time T
During the period, the heating control is performed at an arbitrary ON / OFF cycle, the heating unit is activated when the temperature detected by the second temperature detecting unit is lower than the predetermined temperature θ1, and the heating unit is operated when the temperature detected by the second temperature detecting unit is higher than the predetermined temperature θ1. Is stopped and the temperature in the pot is always kept at θ1. At this time, the power output to the heating means is the first power W1. Here, it is assumed that heating is controlled in a cycle of 16 seconds, and the heating means is operated for 12 seconds. T is 18 minutes, θ1 is 60 ° C., W1 is 100
0W. After a lapse of a predetermined time T, the water absorption step is completed, and a temperature increasing step using the second electric power W2 in which W2> W1 is started. In the heating process and the cooking process, the second power W
2, the heating is performed for a certain time T1, and then the heating is continued for a certain time T2 with the third electric power W3 satisfying W2>W3> W1. A certain time T3 elapses from the start of the heating process to the cooking process,
Alternatively, when the first temperature detecting means detects the predetermined temperature φ1, the cooking process is terminated, and the subsequent processes are continued with the fourth electric power W4 satisfying W3> W4 ≧ W1. Here, W2 is 1300 W, W3 is 1100 W, and W4 is 100
0W, T1 is 16 seconds, T2 is 4:48 minutes, T3 is 5 minutes 4
Second, φ1 is 90 ° C. In the cooking step, the second and third electric powers W are output from when the second temperature detecting means detects the predetermined temperature θ2 to when the first temperature detecting means detects the predetermined temperature φ1.
Depending on the amount of rice cooked, W3 and the amount of rice cooked, it is heated by the fourth electric power W4, the amount of rice cooked is determined from the rate of temperature rise at that time, and the next boiling maintenance step is performed with the thermal power according to the amount of rice cooked. The power in the boiling maintaining step is W4, and the heating power is adjusted by changing the duty ratio in an arbitrary time period. The second temperature detecting means determines that the predetermined temperature θ
Upon detecting 3, the process ends. Here, θ3 is 130 ° C. Before the boiling maintaining step, a power-down step for preventing the spill-over by drawing power once may be inserted if necessary. After that, the steaming process is started, and heating according to the amount of cooked rice is performed a plurality of times during a predetermined time. Through the above rice cooking process, even with low power, regardless of the amount of rice cooked, it is possible to obtain a good-tasting rice with little grain breakage and good fire quality. In this embodiment, the heating cycle in the water absorption step, the operation time of the heating means, T, T1, T2, T3, θ1, θ
The values of 2, θ3, W1, W2, W3, W4 are examples of implementation,
Numerical values can be set according to the situation. In this embodiment, a rice cooker using an induction heating method as a heating means for heating a pan can use particularly high electric power, has good heat responsiveness, and can perform fine control. It is suitable for obtaining good-tasting rice which is the object of the invention. [0016] In addition, although the heater type rice cooker is inferior to the induction heating method due to poor power and thermal responsiveness, it goes without saying that the method of the present invention can provide good-tasting rice. As described above, according to the present invention, a pot for storing an object to be cooked, heating means for heating the pot, and power adjustment capable of outputting at least three different powers to the heating means. Means, and control means for controlling the power adjusting means to heat with high power for a certain period of time or until the first temperature detecting means detects a predetermined temperature, from the temperature raising step to the cooking step, As a result, even with low power, it is possible to obtain a good-quality rice that has a stable state regardless of the amount of cooked rice, has little grain breakage, and has good fire quality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a rice cooker according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the rice cooker. FIG. 3 shows the relationship between rice cooking time, temperature, and power of the rice cooker. Fig. 4 Fig. 4 shows the relationship between rice cooking time, temperature and power of a conventional rice cooker [Explanation of symbols] 1 Pot 2 Heating means 3 First temperature detecting means 4 Second temperature detecting means 5 Electric power Adjusting means 6 Control means

Continuing from the front page (72) Inventor Masafumi Kubo 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. ) References JP-A-61-222416 (JP, A) JP 6-32017 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47J 27/00 109 A47J 27/00 103

Claims (1)

(57) [Claims 1] A pot for putting in an object to be cooked, heating means for heating the pot, first temperature detecting means for detecting boiling,
A second temperature detecting means for detecting the temperature of the pot, a power adjusting means capable of outputting at least three different electric powers to the heating means, and after starting the rice cooking, after performing a water absorbing step with the first electric power W1, the temperature is raised. A certain period of time from the warming process to the cooking process
Or high power until the first temperature detection means detects boiling
Good taste regardless of the amount of cooked rice
In the subsequent temperature raising step for obtaining the rice, the second electric power W2 satisfying W2> W1 is output for a certain period of time T1, and thereafter, W2> W3
The third power W3 that is> W1 is output for a certain period of time T2,
A certain time T from the start of the heating process to the cooking process
When 3 passes, or when the first temperature detecting means detects boiling during the predetermined time T3, heating is continued with the fourth electric power W4 that satisfies W3> W4 ≧ W1, a boiling maintaining step, a steaming step, A rice cooker provided with a control means for controlling the power adjusting means so as to end the rice cooking process.