JPH0630840A - Rice boiler - Google Patents

Abstract

PURPOSE:To provide a rice boiler preventing such deterioration of food taste that the boiled rice under heat retention is locally dried and solidified or whitened and softened by dew condensation and capable of tastily retaining heat. CONSTITUTION:A barrel heater 8 is arranged on the side face of a protective frame 3 supporting a container 2 having a cover 1, the barrel heater 8 is folded into a U-shape or an M-shape, an upper heater section 10 is arranged within 40mm from the upper end of the protective frame 3, and a lower heat section 11 is arranged below 1/2 of the height of the protective frame 3. The boiled rice can be uniformly heated at the time of heat retention, the boiled rice can be heat-insulated with no temperature irregularity, and such deterioration of food taste is prevented that the boiled rice is locally dried and solidified or whitened and softened by dew condensation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker having a heat retaining function.

[0002]

2. Description of the Related Art Recent rice cookers having a heat-retaining function are naturally capable of cooking rice, and as a matter of course, there has been a demand for a heat-retaining function that can keep the food delicious.

A conventional rice cooker of this type will be described with reference to FIG. As shown in FIG. 3, a container 22 provided with a lid 21 on the top and containing rice and water, a protective frame 23 for supporting the container 22, and a lid heater 2 for heating the inside of the lid 21.
4, bottom temperature detecting means 25 for detecting the temperature of the bottom portion of the container 22, and lid temperature detecting means 26 for detecting the temperature of the lid 21.
A bottom heater 27 for heating the bottom portion of the container 22 in the protective frame 23, a body heater 28 for heating the side surface portion of the container 22 in the upper portion of the protection frame 23, a bottom temperature detecting means 25 and a lid temperature detecting means. It is composed of a control circuit board 29 for inputting a signal from 26 and controlling the energization rates of the lid heater 24, the bottom heater 27 and the body heater 28.

Next, the operation of this rice cooker will be described. In the rice cooking process, the lid heater 24 is controlled by the signal from the lid temperature detecting means 26, and the bottom heater 27 and the body heater 28 are controlled by the control circuit board 29 by the signal from the bottom temperature detecting means 25, respectively, to cook rice. To do.

After the rice cooking process is completed, in the heat retaining process, the lid heater 24, the bottom heater 27, and the body heater 28 are all controlled by signals from the bottom temperature detecting means 25 so that the temperature of the container 22 becomes a prescribed heat retaining temperature. The board 29 controls the energization rate to maintain heat.

[0006]

In such a conventional rice cooker, since the body heater is arranged only on the upper part of the protective frame, the temperature of the rice changes depending on the position in the heat retention step, and the temperature unevenness of the rice is caused. And as a result,
There was a drawback that the rice was locally dried and whitened, which deteriorated the taste of the rice.

The present invention is to solve the above-mentioned problems. By widening the area heated by the body heater provided in the protective frame and reducing the temperature unevenness of the rice, the rice is not deteriorated by drying or whitening. The purpose is to keep warm.

[0008]

In order to achieve the above object, the first means of the present invention is to provide a container having a lid on the top for containing rice and water, a protective frame for supporting the container, and the container. A lid heater for heating the inside of the lid, bottom temperature detecting means for detecting the temperature of the bottom portion of the container, lid temperature detecting means for detecting the temperature of the lid portion of the container, and the container for the protective frame. To the lid heater, the bottom heater, and the body heater by inputting signals from the bottom heater for heating the bottom portion of the container, the side heater of the container, and the bottom temperature detecting means and the lid temperature detecting means. Control means for controlling the energization of the body heater, wherein the body heater is arranged in a U shape, the upper heater portion is arranged in the vicinity of the upper end of the protective frame, and the lower heater portion has a height of 1/2 of the protective frame height or more. It is located below.

A second means is the same as the first means, in which the body heaters are arranged in an M shape.

A third means is the same as the first means, except that two body heaters are used and are arranged vertically.

[0011]

According to the present invention, in the heat-retaining process, the wide range of the side surface of the pan can be evenly heated by the body heater and the upper part of the side surface of the pan is also heated in the heat retaining step. Condensation can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

As shown in FIG. 1, a container 2 provided with a lid 1 on the top for containing rice and water, and a protective frame 3 for supporting the container 2
A lid heater 4 for heating the inside of the lid 1, a bottom temperature detecting means 5 for detecting the temperature of the bottom portion of the container 2, a lid temperature detecting means 6 for detecting the temperature of the lid 1, and a protective frame 3 The bottom heater 7 that heats the bottom portion of the container 2, the body heater 8 that heats the side portion of the container 2 at the top of the protective frame 3, and the signals from the bottom temperature detection means 5 and the lid temperature detection means 6 are input. Lid heater 4
A bottom heater 7 and a control circuit board 9 for controlling the energization rate of the body heater 8.

FIG. 2 shows a developed shape of the body heater 8.
Is an upper heater part, and 10 is a lower heater part. Between the upper heater portion 9 and the lower heater portion 10, a heater is folded back in an M-shape to equalize the temperature distribution.

In FIG. 1, the upper heater portion 9 of the body heater 8 is 20 mm from the upper end of the protective frame (it should be within 40 mm).
It is arranged below, and the lower heater part 10 is half the height of the protective frame.
It is located 10 mm below.

Next, the operation of this rice cooker will be described. In the rice cooking process, until the contents boil,
The temperature of the container 2 is controlled by a signal from the bottom temperature detecting means 5. After the temperature of the contents rises and boils, the lid temperature detecting means 6 and the control means 9 are provided in order to eliminate the dew adhered to the lid 1.
The temperature of the lid heater 4 is controlled by. The bottom heater 7 and the body heater 8 are controlled by the bottom temperature detection means 5 and the control means 9 to continue cooking rice.

After the rice cooking process is completed, the process automatically proceeds to the heat retention process. In the heat retention step, the bottom heater 7 and the body heater 8 are connected in series, and the lid heater 4 is controlled independently so that the temperature of the container 2 becomes a prescribed heat retention temperature by signals from the bottom temperature detection means 5, respectively. The circuit board 9 controls the energization rate by dividing it into two circuits, that is, the bottom heater 7, the body heater 8 and the lid heater 4 to keep the heat. In this process, the bottom heater 7 is independently energized during rice cooking, and therefore, for example, 9
Although the power consumption is as high as 00 W, it is connected in series with the body heater 8 at the time of heat retention. Therefore, when combined with the body heater 8 having a power consumption of 55 W, the power consumption of the bottom heater 7 is only about 3.8 W. , Bottom temperature detecting means 5 and container 2
It has the ability to heat the bottom of the and keep the temperature constant. Therefore, the lower heater part 9 of the body heater 8 heats the container 2 as a main heater for maintaining the heat retention temperature of the rice at a specified temperature. Further, the upper heater portion 9 heats the upper portion of the side surface of the container 2 to prevent dew from adhering thereto. Similarly, the lid heater 4 heats the lid 1 to prevent dew from adhering thereto. Here, since the area to be heated by the body heater 8 is large, the rice in the container 2 can be evenly heated, and the rice can be kept warm evenly in temperature.

In this embodiment, the developed shape of the body heater 8 is M-shaped. However, the same effect can be obtained even if the body heater 8 is U-shaped or two upper and lower heaters are arranged in parallel. Needless to say.

[0019]

As is apparent from the above examples, according to the present invention, the rice can be uniformly heated during the heat retaining step, and the rice can be kept warm evenly in temperature.
It is possible to prevent the rice from deteriorating, such as the rice becoming dry and hard locally, or the rice becoming whitened and softened due to dew condensation, and it is possible to provide a rice cooker with a deliciously warm rice. is there. Further, since the body heater has a large heating area, the body heater can dissipate heat better even when the body heater is continuously energized due to a failure of a control circuit or the like, so that a rice cooker with higher safety can be provided. .

[Brief description of drawings]

FIG. 1 is a side sectional view of a rice cooker according to an embodiment of the present invention.

[Fig. 2] Development view of the body heater of the rice cooker

FIG. 3 is a side sectional view of a conventional rice cooker.

[Explanation of symbols]

 1 Lid 2 Container 3 Protective Frame 4 Lid Heater 5 Bottom Temperature Detecting Means 6 Lid Temperature Detecting Means 7 Bottom Heater 8 Body Heater 9 Control Means 10 Upper Heater 11 Lower Heater

Claims (3)

[Claims] 1. A container provided with a lid on the top for containing rice and water,
A protective frame that supports the container, a lid heater that heats the inside of the lid of the container, a bottom temperature detection unit that detects the temperature of the bottom portion of the container, and a lid temperature that detects the temperature of the lid portion of the container. The detection means, the bottom heater for heating the bottom portion of the container to the protection frame, the body heater for heating the side surface portion of the container, the signals by the bottom temperature detection means and the lid temperature detection means A lid heater, a bottom heater, and a control means for controlling energization to the body heater, wherein the body heater is arranged in a U shape, the upper heater portion is arranged in the vicinity of the upper end of the protective frame, and the lower heater is arranged. The part is 1 / of the height of the protective frame
A rice cooker characterized by being arranged below 2. 2. The rice cooker according to claim 1, wherein the body heater is arranged in an M shape. 3. The rice cooker according to claim 1, wherein two body heaters are used and are arranged in parallel vertically.