JPS58141114A - Jar rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The non-invention concerns the jar rice cooker.

Conventionally, a side heater has been wrapped around the outer periphery of the inner frame of a jar rice cooker to cook rice and keep it warm.

In recent years, it has been found that when cooking rice, by raising the temperature of the rice in the upper part of the pot before the rice in the lower part, it is possible to obtain good cooked rice with a rating of 9.

In order to realize the rice cooking method, one of the components is a pot for storing rice to be cooked, an inner frame having a pot storage part for storing the pot, and an outer periphery including the bottom of the pot by the pot storage part. A high-temperature type heater is provided, which is spaced apart from the pot and exposed in the 7JII space. Some devices have a structure in which the surrounding area is heated more than the central area of the bottom. Another method is to heat the cast-in heater at the bottom when cooking rice, and
There are some that use a side heater wrapped around the outer surface of the inner frame to generate heat only during the initial stage of rice cooking or continuously.

However, in the former method, a high-temperature heater installed at a distance from the pot at the bottom of the inner frame generates heat, and the heat is transferred to the top by air convection through a heating space to heat the cooked rice in the upper part of the pot. Therefore, with this method, not only is it not very effective to raise the temperature of the cooked rice in the upper part of the pot higher than that in the lower part, but also, depending on the cooking conditions such as the outside temperature, the temperature of the cooked rice in the upper part of the pot may be raised earlier than that in the lower part. There was a drawback that there were cases where it was impossible to raise the level. In addition, it is known that this heating method has lower thermal efficiency than in the past, and the high-temperature heater itself becomes red hot when energized, which not only shortens its lifespan, but also reduces the heat resistance of the outer frame, inner frame, etc. It needed structure. Furthermore, in order to maintain heat, not only a bottom heater but also a side heater is required to obtain good heat retention performance. On the other hand, in the latter case, the distance between the inner frame and the pot is set to a certain extent and is almost uniform, so the heat generated by the side heater wrapped around the inner frame is transmitted not only to the top of the pot but also to other places. It is also dispersed in the upper part of the rice, so the effect of intensively heating the upper part of the rice is weak. Furthermore, the distance between the inner frame and the pot cannot be made too small because the pot can be attached and removed. For this reason, the amount of heat given to the cooked rice in the upper part of the pot is small, resulting in poor thermal efficiency. Therefore, in order to realize the rice cooking method, the side heater needs to generate a high amount of heat, so the heater itself has to be highly heat resistant and expensive. Also the inner frame.

There was a drawback that the outer frame and other parts needed to be of heat-resistant structure.

The present invention has been made in view of the above-mentioned conventional drawbacks,
The purpose of the present invention is to provide a jar rice cooker that has good thermal efficiency and is capable of intensively heating the rice in the upper part of the pot.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a cylindrical outer frame, 2 is an inner frame that is formed by drawing a thin metal plate installed in the outer frame 1 and has a bottomed cylindrical shape with its upper end enlarged, and 3 is the inner bottom of the inner frame 2. 7 is a side heater wrapped around the upper end of the small diameter part outside the inner frame 2, 4 is an inner pot that is removably placed on the cast heater 3, and 6 is an inner pot. An inner lid that covers the upper opening of the pot 4, 6 is a heat-insulating structure outside, 8 is a heat-retaining heater installed inside the outer lid, 9 is a switch to start the rice cooking operation, and 10 is a pot. It is a magnetic thermostat that detects the temperature at the bottom and completes the rice cooking operation. 11 is a thermal reed switch for controlling the heat retention temperature.

Here, the pot 4 has an upper straight part 41L and a lower inclined part 4.
The inner frame 2 is formed by an upper widening part 2a and a lower diameter small part 2b having a smaller diameter than the upper part.
The distance X between the straight part 4a of the pot and the small diameter part 2b of the inner frame is extremely small compared to the other parts y and z, and the small diameter part outside the inner frame corresponds to the opposing part. A side heater 7 is installed on the side.

The rice cooking method according to the configuration shown in F will be explained with reference to FIG. 2. When the rice cooking operation start switch 9 is operated, the other switches 12 are operated in conjunction with the rice cooking operation start switch 9, and both are closed to the N/0 side.

At this time, the bottom casting heater 3 and the side heater 7 form a parallel circuit, with the bottom casting heater 3 heating the entire inside of the pot from the bottom of the pot, and the side heater 7 heating the cavity in the upper part of the pot where the heat load is small. Alternatively, heat the water surface area intensively. At this time, the upper part of the pot and the side heater are very close9, and the side heater intensively heats the upper part of the pot to enable the rice cooking method. Then, in the latter half of the rice cooking, the magnetic thermometer is activated by detecting the temperature at the bottom of the pot, and the switches 9 and 12 are activated and both are reversed to the N-0 side.

At this time, bottom cast heater 3. The side heater 7° and the heater 8 in the outer lid form a series circuit, forming a heat retention circuit.

As is clear from the above explanation, according to the invention, the heat generated by the heater wrapped around the upper part of the small diameter inner frame part is extremely efficiently radiated to the straight part of the pot. The temperature of the rice in the upper part of the pot can be raised more efficiently than in the lower part, and it is possible to cook rice evenly in the top and bottom. In addition, the side heater requires less heat generation Li, which not only makes it possible to use a low-cost side heater, but also eliminates the need for components such as the inner frame and outer frame to have a heat-resistant structure.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a jar rice cooker showing an embodiment of the present invention, and FIG. 2 is an electric circuit diagram thereof. 1... Outer frame, 2... Inner frame, 3...
・・Cast heater, 4・・Inner pot, 5・・・・
Outer lid, 6... Inner lid, 7... Side heater. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 12 Figure 2

Claims (1)

[Claims] A main body consisting of an outer frame and an inner frame fitted inside the outer frame, a pot stored in the main body, an outer cover that covers the upper opening of the main body, and an outer cover attached to the lower surface of the outer cover. An inner lid that opens and closes integrally to cover the top opening of the pot, a lower heater provided at the bottom of the inner frame of the main body, and a side heater wrapped around the outer periphery of the inner frame, and the side heater of the inner frame A rice cooker in which the distance between the wrapped part and the side wall of the pot facing the inner periphery is smaller than that of the other parts.