JPS58141115A - 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 a jar rice cooker, and an object thereof is to obtain an effective configuration for improving the heat dissipation of a side heater used for heating during cooking and keeping rice warm to a pot.

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

In recent years, it has been found that by raising the temperature of the rice in the upper part of the pot before the rice in the lower part of the pot when cooking rice, the rice can be well cooked. , a pot for storing food to be cooked as one component,
The main body side that stores the pot includes an inner frame having a pot storage section, a heating space provided around the outer periphery including the bottom of the pot by the front +1F pot storage section, and a heating space spaced apart from the pot. r
ntlj provided so as to be exposed in the space,
Some rice cookers are equipped with a high-temperature type heater, and the high-temperature type heater is arranged so as to heat the periphery of the pot rather than the bottom center area during rice cooking. In the rice cooking method, a cast-in heater at the bottom of the pot generates heat during rice cooking, and a side heater wrapped around the outer surface of the inner frame in a position facing ZI to the peripheral wall of the pot part is heated for the first 1υj of rice cooking or continuously during rice cooking. Something that causes heat.

Ta.

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 heating space is used to transfer the heat to the top through air convection, thereby heating the cooked rice at the top of the pot by η0. This method not only cannot be expected to be very effective in raising the temperature of the rice in the upper part of the pot compared to 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. In addition, it has been known that this heating method has poor thermal efficiency, 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 an outer frame and an inner frame. Furthermore, in order to keep warm, not only a bottom heater but also a side heater was required. On the other hand, the latter is an indirect heating method in which a side heater heats a large inner frame located on the upper and lower outer periphery of the pot, and the pot is heated by that heat. Therefore, the local heating effect on the top is Therefore, 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 above-mentioned rice cooking method, it is necessary for the side heater to generate a high amount of heat, so the cord heater, which has traditionally been used as a heat-retaining heater for this part, has to be replaced with a heater that is highly heat resistant and expensive. The disadvantage was that it required the use of In addition, there is a drawback that the inner frame, outer frame, and the like must also have a heat-resistant structure.

Moreover, by using the above two rice cooking methods, it is safe to fix the side heater to the inner frame, which is a large structural component. For this purpose, as shown in FIGS. 4 and 5, a side heater 7', which is enclosed in an aluminum plate 19, is wrapped around the outer surface of the inner frame 2', and the ends are fastened with screws 20. It was fixed.

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 difficult to maintain close contact with the inner frame when heat is applied. 'L
do not have. On the other hand, the cost of aluminum plates is high, the number of parts is large, and automation of the work is difficult, making side heaters expensive. Another method is to wrap the side heater directly around the inner frame while adhering it, but in this case, the adhesive wrapping method requires complicated equipment, making it difficult to rationalize the process, and has the disadvantage of poor repairability.

The present invention has been made in view of the above-mentioned conventional drawbacks, and an object thereof is to provide a jar rice cooker that has a side heater with good thermal efficiency and can intensively heat the cooked 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 a cylindrical inner frame with a bottom formed by drawing a thin metal plate, which is installed inside the outer frame 1, 3 is a cast-in heater, which is installed at the inner bottom of the inner frame 2, and 4 Reference numeral 13 indicates an inner pot which is removably placed on the casting heater 3, 13 indicates a ring-shaped heat dissipation frame attached to the upper part of the space between the inner periphery of the inner frame and the outer periphery of the side wall of the inner frame, and is attached to the upper part of the inner frame. This is a side heater attached to the side surface of the heat radiation frame 13. On the other hand, 6 is an inner lid that covers the upper opening of the inner pot 4, 6 is an outer lid with a heat-insulating structure, 8 is a lid heater installed inside the outer lid for heat retention, and 9 is a switch that starts the rice cooking operation. , 1o is a magnetic thermostat that detects the temperature at the bottom of the pot and completes the rice cooking operation.

11 is a thermal reed switch for controlling the heat retention temperature after cooking rice.

The rice cooking method with the above configuration will be explained with reference to the circuit diagram of the embodiment shown in FIG. 2. When the rice cooking operation start switch 9 is operated, the samuta switch 12 which is linked to this rice cooker is operated, and both the N and O sides are operated. The circuit closes to. At this time, the bottom casting heater 3 and the side heater 7 form a parallel circuit, and the bottom casting heater 3 heats the entire pot from the bottom of the pot, and the side heater 7 attached to the heat radiation frame 13 heats the entire pot from the bottom of the pot. The cavity or water surface area, which has a small heat load, is heated intensively. As a result, the cooked rice in the upper part of the pot is effectively heated to enable the rice cooking method described above. In the later stages of rice cooking, a magnetic thermostat is activated by detecting the temperature at the bottom of the pot, and switches 9 and 12 are activated to reverse both to the N and C sides. At this time, bottom υ, S-included heater 3. The side heater 7 and the heater 8 in the outer lid form a series circuit, and together form a heat-retaining circuit that heats and heats the rice from the entire circumference with a small amount of electric power, so it is possible to create a heat-retaining side leg with an even temperature distribution.

As is clear from the above explanation, according to the present invention, the heat generated by the side heater heats only the heat dissipation frame 13, which is much smaller than the conventional inner frame, and this heat dissipation frame is directed against the upper part of the inside of the pot. Dissipates heat intensively. Also, the heat radiated to the inner frame is reflected and radiated to the top of the pot. Therefore, the heat generated by the side heater is extremely effectively and intensively radiated to the water that initially exists in the inner pot and the rice at the top, and the rice at the top of the pot also absorbs sufficient water and is heated. As a result, a good rice cooking condition can be obtained.

Further, the side heater may generate a relatively small amount of heat, and a low-cost one can be used, and parts such as the inner frame and outer frame do not need to have a heat-resistant structure. In addition, the side heater can be attached to the heat dissipation frame as a small part by an easy method such as caulking, and the heat dissipation frame can be attached at the same time as the inner frame is attached to the outer frame. ,＜,It is extremely easy and reliable to attach and can be automated.

Note that the lead wires of the side heaters may be guided toward the inner frame body by providing a notch in the inner frame.

[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, FIG. 2 is an electric circuit diagram of the jar rice cooker, and FIG.
The figure is an enlarged sectional view of the main part of the same jar rice cooker, FIG. 4 is a partially cutaway front view of the inner frame and side heater of the conventional jar rice cooker, and FIG. 6 is a front view of the same. 1...Outer frame, 2...Inner frame, 3...
・Casting heater, 4・・・Inner pot, 6・・・・・・
Outer lid, 6... Inner lid, 7... Side heater, 13... Heat radiation frame. Name of agent: Patent attorney Toshio Nakao and one other person II
Figure 2Figure 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 body, an outer lid that covers the upper opening of the main body, and an outer lid attached to the lower surface of the outer lid, An inner lid that opens and closes integrally with the outer lid 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 ring-shaped C; provided at the upper part between the inner frame of the main body and the pot. A jar rice cooker comprising a heat radiation frame and a side heater provided circumferentially between the heat radiation frame or the inner frame and the heat radiation frame.