JPS58143715A - 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 present invention relates to an inner frame of a rice cooker and a structure of a wrapping portion of a side heater wrapped around the inner frame used for heating during cooking and keeping warm rice.

Conventionally, a side heater was wrapped around the inner frame of a jar rice cooker.
Rice was being cooked and kept warm.

In recent years, it has been found that rice can be cooked better by raising the temperature of the rice in the upper part of the pot before the rice in the lower part of the pot.

In order to realize the rice cooking method, a pot for storing cooked rice, an inner frame having a pot storage part for storing the pot, and a heating provided around the outer periphery including the bottom of the pot by the pot storage part are provided. and a high-temperature heater provided exposed in the space so as to be spaced apart from the pot,
Some of the high-temperature type heaters have a structure in which the pot is arranged so as to heat the surrounding area of the pot rather than the bottom center area during rice cooking. Other configurations include a configuration in which a cast-in heater at the bottom generates heat during rice cooking, and a side heater wrapped around the outer surface of the inner frame generates heat at the beginning or continuously of rice cooking.

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 convection of air through the heating space to heat the cooked rice in the upper part of the pot. This method not only cannot be expected to have the effect of raising the temperature of the 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 rice in the upper part of the pot may be lower than that in the lower part. There was a drawback that there were cases where it was impossible to raise the level in advance. First, 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 requires heat-resistant structures such as the outer frame and inner frame. For extra heat retention, a side heater is required instead of a bottom heater scale. On the other hand, the latter is an indirect heating method that heats the inner frame with a side heater and uses that heat to heat the pot. Therefore, the local heating effect on the top is small and the heat needle applied to the cooked rice at the top of the pot is It becomes smaller and has 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. Furthermore, there is a drawback that the inner frame, outer frame, and the like must also have a heat-resistant structure.

Moreover, according to the two rice cooking methods, it is necessary to fix the side heater to the inner frame. For this purpose, as shown in FIGS. 4 and 6, a side heater 7', which is housed in an aluminum plate 19, is wrapped around the outer surface of the inner frame 2', and the ends are fastened with screws 20. was.

According to this configuration, when the temperature rises due to heat generation, the aluminum plate 19 thermally expands in the circumferential direction and comes off from the inner frame 2', which makes it impossible to achieve close contact with the inner frame 2' when heat is applied. . On the other hand, the cost of the aluminum plate 19 is high, the number of parts is large, it is difficult to automatically install one-time work, and the side heater is expensive. Another method is to glue and wrap the side heater directly around the inner frame, but in this case, the adhesive wrapping requires complicated equipment and it is difficult to rationalize the process.
It also had the disadvantage of poor repairability.

The present invention has been made in view of the above conventional drawbacks, and aims to improve the latter conventional example by reducing the number of parts and providing a jar rice cooker that has good thermal efficiency and is capable of intensively heating the rice in the upper part of the pot. That is.

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

In Fig. 1, 1 is a cylindrical outer frame, 2 is a cylindrical inner frame with a bottom formed by drawing a thin metal plate, and 3 is a cast-in heater installed in the inner bottom of the inner frame 2. , 7 is a side heater wrapped around the outer surface of the inner frame 2, 4 is an inner pot that is removably placed on the casting heater 3, and 6 is an inner lid that covers the top opening of the inner pot 4. , 6 is an outer cover having a heat insulating structure.

8 is a heat-retaining heater installed in the outer lid, 9 is a switch that starts the rice cooking operation, and 1o is a magnetic thermostand that detects the temperature at the bottom of the pot and completes the rice cooking operation. 1
1 is a thermal reed switch for controlling the heat retention temperature after cooking rice.

Here, the portion 13 of the inner frame 2 around which the cord-shaped heater is wrapped is
Cut holes 13' facing the inner surface of the inner frame and opening downward with a constant width in the circumferential direction are partially formed at several locations on the circumference.

The rice cooking method using the top and bottom configuration will be explained with reference to FIG. 2. When the rice cooking operation start switch 9 is operated, the switch 12 linked thereto is operated, and both of the switches are closed to the No side.

At this time, the bottom casting heater 3 and the side heater 7 constitute a parallel circuit, the bottom Komagome heater 3 heats the entire pot from the bottom of the pot, and the side heater 7 intensively heats the top of the pot. At this time, the amount of heat generated by the side heater 7 directly heats the upper part of the pot, not through the inner frame 2, so even if the amount of heat generated is small, the side heater 7 intensively heats the rice in the upper part of the pot. It heats effectively and enables the above-mentioned rice cooking method. In the later stages of rice cooking, the magnetic thermostat 10 is activated by detecting the temperature at the bottom of the pot, and the switches 9 and 12 are activated to reverse both to the N and C sides. At this time, the shield heater 3, the side heater 7,
The heater 8 in the outer lid becomes a series circuit, and forms a heat-retaining circuit that can keep and heat the rice from the entire circumference with a small amount of electric power.

As is clear from the above description, according to the present invention, the amount of heat 1 generated by the side heater through the cut holes in the inner frame is transferred to the cooked rice in the upper part of the inner pot and is efficiently radiated. Therefore, the temperature of the cooked rice in the upper part of the pot can be raised more efficiently than in the lower part. Therefore, not only the side heater can be used as a low-priced side heater with small heat generation, but also parts such as the inner frame and outer frame do not need to have a heat-resistant structure.

Further, even if water is allowed to flow from the inner frame E section, it will not enter the inside of the main body or the side heater.

On the other hand, when fixing the side heater to the inner frame, if you wrap it around the inner frame, it will not shift, and you only need to fix the ends, and there is no need for aluminum plates or adhesives, and it is extremely inexpensive compared to conventional methods. It also makes it easier to automate the work.

[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 1! Fig. 3 is a sectional view of the main parts of the same jar rice cooker, Fig. 4 is a partially cutaway front view of the inner pot and side heater of the conventional jar rice cooker, and Fig. 5 is the same front view. It is a diagram. 1... Evening tenth frame, 2... Inner frame, 3...
... Hook heater, 4 ... Inner pot, 6 ...
・Outer lid, 7...Side heater, 13'...
- Cut hole. Name of agent: Patent attorney Toshi Nakao (male) 1st person
Figure 2 Figure 2 Figure 4

Claims (1)

[Claims] A main body consisting of an outer frame and an inner frame built into the outer frame, a pot stored in the main body, an outer lid that opens the top opening of the main body, and an outer lid that is attached to the lower surface of the outer lid and opens and closes integrally with the outer lid. An inner lid that covers 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 peripheral side of the inner frame, the side heater of the inner frame being wrapped around. A jar rice cooker with a diagonal number of cut holes facing the inner surface of the inner frame and extending in the circumferential direction.