JPS6040177Y2 - rice cooker - Google Patents

Description

[Detailed description of the invention] This invention aims to eliminate the uneven cooking at the top and bottom, which is a drawback of conventional rice cookers that heat only the bottom of the inner pot, and to improve heating efficiency and durability. An example will be explained with the help of a diagram.

1 in FIG. 1 is a main body outer frame 2 of a rice cooker, which is an inner container built into the outer frame 1, and a stepped portion 3 with a larger inner diameter is provided at the upper end thereof.

4 is a main body ring that connects the upper ends of the outer frame 1 and the inner container 2;
A plurality of holding pieces 5 are provided intermittently on the inner peripheral surface.

6 is a mounting screw that connects the inner container 2 to the main body ring 4; 7 is an auxiliary heater that is wound and fixed around the holding piece 5; its detailed configuration is shown in FIG. 2; It has a ring-like shape, both ends of which are tightened by springs 10, and are crimped and fixed to the holding piece 5.

11 is an inner ring detachably attached to the upper part of the inner container 2, and its outer diameter is equal to the inner diameter D formed by the holding piece 5 of the main body ring 4.
□Slightly smaller than □ to make it easier to put on and take off.

12 is a rice cooking heater attached near the bottom of the inner container 2, 13
14 is a thermostat fixed to the outside of the inner container 2; 14 is a thermal reactor provided so as to be freely retractable from a hole provided at the bottom of the inner container; 1;
5 is a main switch operated by the operation of the thermal reactor 14;
16 is a switch lever whose one end is connected to the thermal reactor 14, and which has a pivot part in the middle and an operating knob at the other end so that it can be rotated to open and close the main switch 15; 17 is a lid; and 18 is a lid. This is a lid heater provided on the inner surface of 17.

The effects of the above configuration will be explained in the order of rice cooking.

First, the inner pot 11 containing weighed washed rice and water is inserted into the inner container 2 so as to be placed on the main body ring 4.The outer diameter of the inner pot 11 is slightly smaller than that of the D method. Enter smoothly.

The heat dissipation plate 9 of the auxiliary heater 7 is protected by the holding piece 5, and the inner wall diameter D2 of the inner container 2 is larger than the inner diameter D of the main body ring 4, so there is no fear that the inner pot 11 will come into direct contact with either of them.

In general, metal materials are used for the inner container 2, heat dissipation plate 9, and inner pot 11 for functional purposes, but contact between these is not desirable as it may damage the surface treatment film or cause deformation and damage, but the main body ring 4 Since it is generally possible to use a plastic material, contact with the inner pot 11 brings good results to its durability.

When the inner pot 11 is placed, the heat reactor 14 is inserted into the bottom of the pot, and when the operating knob of the switch lever 16 is pushed down, the main switch 15 is closed as shown in FIG. 3, and the rice cooking heater 12 is heated. .

At this time, the thermostat 13 is closed, so the auxiliary heater 7 is also heated, but since both heaters are located in the heating space A, which is spaced from the inner wall of the inner container 2, and the heating space B, which is formed by the stepped portion 3, the content may be tampered with. The auxiliary heater 7 efficiently heats the inner pot 11 from the gap between the holding pieces 5 without heating the pot 2 locally.

Conventional rice cookers had the disadvantage that the upper and lower parts of the inner pot 11 were not heated uniformly because only the rice heater 12 heated the rice, resulting in uneven cooking, but according to the present invention, uniform heating can be obtained by heating the auxiliary heater 7. .

When the temperature of the inner pot 11 rises to around 70°C, the thermostat 13 opens, and from then on the rice cooking heater 12 with a large heating ratio is turned on.
The temperature rise inside the inner pot 11, which is heated by a chisel, is such that the upper part becomes hotter due to the convection of water, and the water level decreases due to water absorption, so that rice cooking is generally completed before the lower part.

Therefore, it is preferable to open the thermostat 13 before and after the start of boiling and reduce the heating power to only the rice cooking heater 12, from the viewpoint of good rice cooking and thermal efficiency.

When the water inside the inner pot 11 runs out and the temperature at the bottom rises, which is the so-called rice cooking completion state, the thermal reactor 14 senses the temperature rise and rotates the switch lever 16 counterclockwise to open the main switch 15. to stop heating all heaters.

In the so-called warm state where the temperature of the inner pot 11 eventually drops to about 70°C, the thermostat 13 senses the temperature and opens and closes the rice cooking heater 12 and the auxiliary heater 7.
The lid heater 18 heats and keeps the inner pot 11 warm from all directions, but the rice cooking heater 12 and auxiliary heater 7 are located between the inner pot 11 and the inner pot 2, resulting in less heat loss to the outside of the pot and efficient heating. I can do it.

Furthermore, since the auxiliary heater 7 is housed in the crotch portion of the inner container 2, the structure is designed with safety in mind so that it can be prevented from falling off even if it is not sufficiently fixed to the holding piece 5.

As described above, this structure not only increases the durability of each part, but also allows for even cooking and efficient heat retention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the rice cooker of the present invention, FIG. 2 is a perspective view of the configuration of an auxiliary heater 7, and FIG. 3 is a wiring circuit diagram.

Claims (1)

[Scope of utility model registration request] In a rice cooker in which an inner pot for storing rice to be cooked is removably inserted through the upper opening of an inner container having a rice cooking heater fixed to the bottom portion, the inner diameter of the upper end portion is increased to form a crotch portion 3. A plurality of holding pieces 5 are intermittently provided on the inner peripheral surface of a ring-shaped main body ring 4 that connects the inner container 2 and the upper ends of the outer frame 1, and an auxiliary heater 7 is wound around the holding pieces 5. A rice cooker characterized in that an auxiliary heater 7 is interposed between the crotch portion 3 of the inner container 2 and the holding piece 5 of the main body ring by being fixed.