JPS6020972Y2 - rice cooker - Google Patents

Description

[Detailed description of the invention] This invention solves the problem of 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 also aims to improve heating efficiency and durability. An example will be explained with the help of a diagram.

In Fig. 1, 1 is an outer frame of the rice cooker, 2 is an inner container built into the outer frame 1, and 3 is a main body ring 4 that connects the upper ends of the outer frame 1 and the inner container 2, which connects the inner container 2 to the main body ring 3. Mounting screws to be connected, 5 are rice cooking heaters fixed to the bottom of the inner container 2, 6 are tubular auxiliary heaters fixed along the inner wall of the inner container 2 at a distance of d', and 7 are attached to the outer wall of the inner container 2. A fixed thermostat, 8 a thermal reactor provided so as to be able to come out and go through a hole provided at the bottom of the inner container 2, 9 a main switch operated by the operation of the thermal reactor 8, 10 one end connected to the thermal reactor 8, and a rotating 11 is a lid, 12 is a lid heater provided on the inner surface of the lid 11, and 13 is an inner container 2. The outer diameter of the inner ring, which is removably attached to the upper part of the main body ring 3, is slightly smaller than the inner diameter D1 of the main body ring 3 to facilitate attachment and detachment.

Next, the effects of the present invention constructed as described above will be explained in accordance with the rice cooking order.

First, fill an inner pot with washed rice and water with an appropriate amount of water.
3 is inserted into the inner container 2, but since the outer diameter of the inner pot 13 is slightly smaller than the inner diameter D1 of the main body ring 3, it can be inserted smoothly.

Also, the inner diameter D2 of the auxiliary heater 6 is the inner diameter D□ of the main body ring 3.
Since it is larger, the outer diameter of the inner pot 13 is always guided by the inner diameter D1 portion of the main body ring 3, and the inner pot 13 can be attached and removed without coming into contact with the auxiliary heater 6 or the inner wall surface of the inner container 2.

In general, metal materials are used for the inner container 2, auxiliary heater 6, and inner pot 13 for functional purposes, but contact between these materials may damage the surface treatment film, cause deformation, or damage, which is undesirable, but the main body ring 3 can generally be made of plastic material, so that contact with the inner pot 13 brings good results to its durability.

When the inner pot 13 is placed, the thermal reactor 8 lands on its bottom, and when the knob of the switch lever 10 is pressed down, the second
As shown in the figure, the main switch 9 is closed to heat the rice cooking heater 5.

At this time, since the thermostat 7 is closed, the auxiliary heater 6 is also heated, but both heaters are heated from the inner wall of the inner container 2.
Since the inner pot 13 is located in the heating space A spaced apart by the dimension d', the inner pot 13 can be efficiently heated without unnecessarily heating the inner pot 2. In addition, since conventional rice cookers only heat the rice cooking heater 5, the inner pot 13 can be heated efficiently. Although there was a drawback that the upper part was not heated uniformly and uneven cooking occurred, uniform heating can be obtained by heating with the auxiliary heater 6.

Since the operating temperature of the thermostat 7 is around 70°C, the thermostat 7 raises the inner pot 13 to around 70°C.
The circuit is opened, and thereafter, the rice is heated only by the rice cooking heater 8, which has a large heating ratio.

The temperature rise inside the inner pot 13 is caused by the convection of water, and the upper part becomes high in temperature, and the water level decreases due to water absorption, so that rice cooking is generally completed first from the lower part.

Therefore, it is preferable to open the thermostat 7 before and after the start of boiling and reduce the heating power to only the rice cooking heater 5 from the viewpoint of good rice cooking and thermal efficiency.

Then, the water inside the inner pot 13 disappears and the temperature at the bottom rises, which is the so-called rice cooking completion state. Open the circuit and stop heating all heaters.

In the so-called warm state where the temperature of the inner pot 13 eventually drops to about 7 CI'C, the thermostat 7 senses the temperature and opens and closes the rice cooking heater 5 and the auxiliary heater 6.
The lid heater 12 heats and keeps the inner pot 13 warm from all directions, but the rice cooking heater 5 and auxiliary heater 6 are located between the inner pot 13 and the inner pot 2, which reduces the amount of heat escaping to the outside of the pot, resulting in efficient heating and heat retention. I can do it.

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, and FIG. 2 is a circuit diagram thereof. 2...Inner container, 3...Body ring, 6
...Auxiliary heater, 13...Inner pot.

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 with a rice cooking heater fixed to the bottom part, the inner pot 1 has a smaller diameter than the inner wall of the inner container 2.
3. A main body ring 3 having an inner diameter D1 slightly larger than the outer wall is fixed to the upper end of the inner container 2, and a ring-shaped auxiliary heater 6 is installed so that the inner diameter D2 is larger than the inner diameter D1 of the main body ring 3 and is located within the inner wall of the inner container 2. A rice cooker characterized in that the inner container 2 is fixed near the inner wall.