JPH0531028A - Rice boiler - Google Patents

Abstract

PURPOSE:To heat a whole inner pot and uniformly boil the whole rice. CONSTITUTION:The water of a water tank 9 stored in a preset space 4 formed between a frame 1 and a storage case 3 is fed to heating spaces 6, 7 between the bottom wall and side wall of an inner pot 5 and the storage case 3 as high-temperature steam to heat the bottom wall of the inner pot 5, and it is discharged along a discharge path 21 to uniformly heat the whole inner pot 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker that cooks rice by steam heating.

[0002]

2. Description of the Related Art An ordinary electric rice cooker cooks rice by placing a pot containing rice and water on the upper surface of a heating plate containing a heater. In this case, the pot is heated directly. In addition, there was a drawback that the bottom rice in the pan was burnt and the upper and lower parts of the pan were unevenly cooked.

Therefore, as a rice cooking method for preventing the occurrence of charring and uneven cooking, a steam cooking method has been proposed as disclosed in Japanese Patent Application Laid-Open No. 2-283329. In this case, steam is applied to the rice to cook the rice as in the case of making so-called red rice, but with the progress of cooking, excess steam near the steam inflow side resulted in sticky rice. In addition, since the steam generator is provided separately from the rice cooker body, the device becomes large.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to prevent the occurrence of kogation by heating the entire inner pot with high temperature steam and to uniformly heat the entire rice to eliminate uneven cooking.

[0005]

The present invention comprises a frame,
A storage case provided with a predetermined space inside the frame, and an inner pot that is housed in the storage case and forms a heating space that communicates between the bottom wall and the side wall of the storage case.
A steam port that is provided in the center of the bottom wall of the storage case and opens toward the heating space; a removable water tank that is stored in the predetermined space; and a steam generator that heats the water in the water tank, The exhaust passage is provided above the heating space and communicates with the outside air. The steam generated by the steam generator flows into the heating space through the steam port to heat the inner pot.

A part of the steam generator is in close contact with the side wall of the storage case.

[0007]

[Operation] The steam that has become hot due to the steam generator blows out from the steam port and heats the bottom of the inner pot, then rises while heating the side of the inner pot and discharges it into the outside air from the discharge path. Uniformly heat the bottom and sides of the pan to eliminate the unevenness of the cooked rice at the top and bottom of the inner pan. In particular, steam is applied to the bottom wall of the inner pot, which requires the most amount of heat, to prevent stickiness of the bottom rice in the inner pot.

Further, since the heat generated by the steam generator is also transferred to the storage case, the temperature of the storage case becomes high and the steam ejected from the steam port does not condense on the inner wall surface of the storage case.

[0009]

Embodiments of the present invention will be described with reference to the drawings.
(1) is a cylindrical frame, (2) is a cover provided below the frame, (3) is a storage case provided with a predetermined space (4) inside the frame (1), (5) ) Is an inner pan which is provided in the storage case (3) so as to be freely stored and has a chevron-shaped bottom wall, and a relatively large first heating space (6 ) Is formed, and the first heating space (6) is formed between the side wall and the side wall of the storage case (3).
A second heating space (7) communicating with is formed. As shown in FIG. 1, the second heating space (7) has a large lower part and a smaller part toward the upper part. The steam flowing into each space does not sufficiently heat the inner pot (5) to be in the outside air. To prevent it from being released.

(8) is a storage case provided in the predetermined space (4), (9) is a water supply tank detachably provided in the storage case, and (10) is a bottom wall of the storage case (3). The steam port provided in the central portion is formed in a mountain shape in accordance with the shape of the bottom wall of the inner pot (5) and forms the steam chamber (11). In this steam chamber, the inflowing steam is temporarily retained and is ejected uniformly from the plurality of small holes (12) (12). (13) is the water tank (9) and the steam chamber (1
1) The outflow pipe made of a material having good heat conduction (for example, aluminum) for connecting with 1), (14) is a steam generator, and a heat transfer fan (15) attached to the outside of the outflow pipe (13) Heater (16) installed in this fan
The heat transfer fan (15) ... is in close contact with the outer bottom wall of the storage case (3). (17) is an electromagnetic valve provided in a part of the outflow pipe (13), (1
8) is an inner lid for covering the upper surface of the inner pot (5), (19) is a lid provided above the inner pot (5) and the frame (1), and an exhaust port (20) communicating with the outside air is provided. ing. (2
Reference numeral 1) is an exhaust passage, one end of which communicates with the uppermost portion of the second heating space (7) and the other end of which communicates with the exhaust port (20). Are configured.

Reference numeral (22) is an auxiliary heater closely attached to the side wall of the storage case (3), and reference numeral (23) is an electric board provided in a predetermined space (4) on the opposite side of the water tank (9). A microcomputer (not shown) and various electronic parts are attached to control the opening and closing of the heater (16) and the electromagnetic valve (17) according to the temperature of the inner pot (5) and the elapsed time. Reference numeral (24) is a temperature sensor that protrudes inward from the storage case (3) and is brought into contact with the inner pot (5), and is connected to the electrical equipment substrate (23).

Next, the operation will be described. First, a predetermined amount of rice and water are put into the inner pot (5), and the inner lid (18) is applied to cover the inner pot (5) and the frame (1) with the lid (1).
Cover with 9). Subsequently, the water tank (9) is removed, the amount of water required for one rice cooking is put and stored in the storage case (8), and the heater (16) is energized to reach a high temperature, and the electromagnetic valve (17) is reached. When opened, the water in the water tank (9) flows through the outflow pipe (13) to the steam generator (14).
It flows into the inside and becomes high temperature steam, flows into the steam chamber (11), and is uniformly discharged from the small holes (12) (12) ... To the bottom wall of the inner pot (5).

As described above, when the heater (16) is energized and the temperature of the steam generator (14) becomes high, the heat is transmitted from the heat transfer fan (15) to the storage case (3) and the temperature of the storage case rises. This is a small hole (12) (1) through the steam chamber (11).
2) This is to prevent dew condensation even if the steam flowing out of the storage case (3) comes into contact with the inner side wall of the storage case (3) when flowing into the first and second heating spaces (6) and (7). The hot steam released toward the bottom wall of the inner pot (5)
After entering the heating space (6) and heating the bottom of the inner pan (5), it flows from the bottom wall toward the peripheral wall and enters the second heating space (7) to heat the side wall of the inner pan (5) and exhaust it. It flows out of the exhaust port (20) via the passage (21).

Therefore, the steam in the hottest state should be applied to the bottom wall of the inner pot (5) which needs high temperature, and the steam in a state where the temperature is slightly lower should rise along the side wall of the inner pot (5). Therefore, the most ideal heating form is obtained.

With the heating, as shown in FIG. 2, from the start of heating to the time (T1), the temperature is rapidly heated regardless of the amount of cooked rice, and then from the time (T1) to the saturation temperature (T2), the temperature sensor (24 ), And heat based on the amount of rice cooked. The sensor temperature is the temperature (QA)
To (QB), the time (TA)-(TB) is measured and determined based on the time.

After that, after reaching the saturation temperature (T2), the inner pot (5) is heated for the heating time (TC) according to the above-mentioned determination result of the amount of cooked rice.

The auxiliary heater (22) energizes continuously or intermittently during rice cooking to prevent dew from adhering to the inner wall of the storage case (3).

[0018]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to prevent the occurrence of kogation by heating the entire inner pot with high temperature steam and to uniformly heat the entire rice to eliminate the unevenness of cooking.

Further, since the heat of the steam generator is transferred to the storage case, even if the steam touches the inner wall of the storage case, dew condensation does not occur.

[Brief description of drawings]

FIG. 1 is a sectional view of a rice cooker of the present invention.

FIG. 2 is a characteristic diagram showing sensor temperature and inner pot temperature.

[Explanation of symbols]

1 frame 3 storage cases 4 predetermined space 5 inner pot 6 First heating space 7 Second heating space 9 water tank 10 Steam port 14 Steam generator 21 exhaust path

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsutomu Yamaguchi             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Norio Yamane, inventor             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Norio Yamamoto             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Sadayuki Doi             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. A heating space which is communicated between a frame, a storage case provided inside the frame with a predetermined space, and a bottom wall and a side wall of the storage case which communicate with each other. An inner pan to be formed, a steam port provided at the center of the bottom wall of the storage case and opening toward the heating space, a removable water tank stored in the predetermined space, and water for heating the water tank. And a discharge passage that is provided above the heating space and communicates with the outside air, and steam generated by the steam generator flows into the heating space from the steam port to heat the inner pot. Rice cooker. 2. The rice cooker according to claim 1, wherein a part of the steam generator is in close contact with a side wall of the storage case.