JPH0114255Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a rice cooker in which a sheathed wire heater is provided in a heating space below the inner pot and spaced apart from the inner pot.

[Technical background of the invention and its problems]

Conventionally, in this type of rice cooker, a sheathed wire heater is disposed in a heating space below the inner pot with a predetermined gap from the inner pot, and the inner pot is heated by this sheathed wire heater. and was cooking rice. However, since the sheathed wire heater generates less heat than a heat source such as gas, there is a problem in that it takes a long time from the start to the completion of rice cooking. Therefore, if you try to shorten the cooking time by simply increasing the calorific value (power consumption) of the sheathed wire heater, the surface temperature of the sheathed wire heater will rise, and the temperature at the bottom of the pot near the sheathed wire heater will locally rise. A new problem arises in that the rice at the bottom of the pot burns.

[Purpose of invention]

The present invention was devised in view of the above points, and its purpose is to provide a rice cooker that can shorten rice cooking time and prevent the occurrence of burnt rice.

[Summary of the idea]

In the present invention, first and second sheathed wire heaters are arranged in a heating space below the inner pot with a predetermined gap from the inner pot, and the power consumption of the first sheathed wire heater is reduced. The power consumption is set to be larger than the power consumption of the second sheathed wire heater, and the thickness of the first sheathed wire heater is made larger than the thickness of the second sheathed wire heater. The two sheathed wire heaters are connected in parallel and energized at the same time, and when the inner pot reaches a predetermined temperature, the second sheathed wire heater is turned off by the temperature detection device, and then only the first sheathed wire heater is energized. By doing so, the inner pot is heated by the first and second seeded wire heaters in the early stage of rice cooking, and the inner pot is heated only by the first seeded wire heater in the later stage of rice cooking. Has characteristics.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. In Figures 1 and 2, 1 is the outer frame,
A bottom frame 2 is attached to the lower end, and the upper opening is openably closed by a lid 3. 4 is a container-shaped inner case housed in the outer frame 1, 5 is an inner pot housed in the inner case 4, and the outer bottom wall of the inner pot 5 and the inner case 4 are
A substantially sealed space 6 for heating is formed between the inner bottom walls of the housing. Reference numeral 7 denotes a well-known heat-sensing device for detecting cooked rice using magnetic shunt steel 8 as a heat-sensing body, of which magnetic shunt steel 8 is attached to the upper inner surface of a heat transfer cap 9 whose bottom surface is open. The heat transfer cap 9 is urged upward by a spring 11 disposed between the heat transfer cap 9 and a support plate 10 attached to the bottom wall of the inner case 4. It penetrates through an opening 4a formed in the wall and is in close contact with the outer bottom wall of the inner pot 5. On the other hand, the magnet part 1 of the thermal device 7
2 is supported inside the heat transfer cap 9 so as to be movable up and down, and is urged downward by a spring 13. Reference numeral 14 denotes an operating rod rotatably supported on the bottom frame 2, one end of which is connected to the lower end of the magnet portion 12, the other end of which penetrates the bottom frame 2 and protrudes outward. A knob 15 is attached to the part. 16 is a rice cooking switch operated by the operating rod 14, which is closed when the knob 15 is set downward (see Figure 1).
Then, when the heat-sensitive device 7 is activated and the operating rod 14 returns, it opens (see FIG. 2). Now, 17 is a thermostat as a temperature detection device placed in parallel with the magnetic shunt steel 8 in the heat transfer cap 9.
7 is designed to open the contact piece when the outer bottom wall of the inner pot 5 reaches, for example, about 100°C. 18 is a first sheathed wire heater located in the space 6 and supported by the inner case 4 with a predetermined gap between it and the inner pot 5; 19 is an outer side of the first sheathed wire heater 18; A second sheathed wire heater is also supported by the inner case 6 with a predetermined gap between it and the inner pot 5. The thickness of the first sheathed wire heater 18 is larger than the thickness of the second sheathed wire heater 19, and the power consumption (heat amount) of the first sheathed wire heater 18 is larger than that of the second sheathed wire heater 19. It is set larger than the power consumption (heat amount) of the wire heater 19.

Now, in FIG. 3 showing the electrical configuration, the first
The sheathed wire heater 18 is connected to the power plug 20 via the rice cooking switch 16. Also the second
The first sheathed wire heater 19 is connected in series with the thermostat 17, and this series circuit is connected in parallel with the first sheathed wire heater 18. 21 is a rice cooking lamp, and 22 is a resistor.

Next, the operation of the above configuration will be explained. Rice and water are put into the inner pot 5, the inner pot 5 is stored in the inner case 4, and the lid 3 is closed. Next, push knob 15 downwards,
The operating rod 14 is rotated, the magnet portion 12 is raised, the magnet portion 12 is attracted to the magnetic shunt steel 8, the operating rod 14 is set, and the rice cooking switch 16 is closed.
Then, the first sheathed wire heater 18 and the second sheathed wire heater 19 are energized at the same time, so that the inner pot 5
The rice and water inside are the total power consumption (heat amount) of the first sheathed wire heater 18 and the second sheathed wire heater 19.
heated by. When the rice and water in the inner pot 5 are heated and the temperature rises, and the temperature of the outer bottom wall of the inner pot 5 reaches, for example, about 100°C, the thermostat 17 is activated and the second sheathed wire heater 19 is cut off. After that, only the first sheathed wire heater 18 is energized. Then, when the first sheathed wire heater 18 further heats the pot 5 for a predetermined time and the moisture in the inner pot 5 disappears and the rice cooking is completed, the temperature of the bottom wall of the inner pot 5 rises rapidly. The magnetic shunt steel 8 loses its magnetism, the magnet part 12 is urged downward by the elastic force of the spring 13, the operating rod 14 returns, and the rice cooking switch 16 is activated.
will be released.

According to the above embodiment, the following effects can be obtained. That is, when the rice and water in the inner pot 5 are near room temperature at the beginning of rice cooking, the first seeded wire heater 18 and the second seeded wire heater 19 are energized at the same time and are heated by both, so that the rice and water in the inner pot 5 are heated at the same time. The temperature of water can be raised to the boiling point in a short period of time, and the cooking time can be shortened. Further, after the second sheathed wire heater 19 is powered off, it is heated by the first sheathed wire heater 18, but the thickness of the first sheathed wire heater 18 is smaller than that of the second sheathed wire heater 19. Since the first sheathed wire heater 18 is formed in a large size, its surface area is large.
The surface temperature of the inner pot 5 is lowered, and no local high-temperature parts are generated even in the part of the bottom wall of the inner pot 5 close to the first sheathed wire heater 18, and it is possible to prevent the occurrence of scorching when rice cooking is completed.

Now, when cooking rice, a large amount of heat is required in the initial stage of cooking until the temperature of the inner pot 5 reaches a predetermined temperature (for example, 100°C). Cooking time is shortened, but
In the later stages of rice cooking, the amount of heat generated is low enough to compensate for the amount of heat dissipated. In particular, according to the above embodiment, the power consumption of the first sheathed wire heater 18 is reduced by the second sheathed wire heater 18.
Since it was set larger than the sheathed wire heater 19,
Even if the rice is heated only by the first sheathed wire heater 18 during the rice cooking, the required amount of heat is sufficiently obtained and the rice cooking time does not become longer.

[Effect of idea]

As is clear from the above description, the present invention includes disposing a sheathed wire heater in a heating space below the inner pot with a predetermined distance from the inner pot, and reducing the consumption of the first sheathed wire heater. The electric power is set higher than the power consumption of the second sheathed wire heater, and the thickness of the first sheathed wire heater is made larger than the thickness of the second sheathed wire heater. By simultaneously energizing the second sheathed wire heater, turning off the power when the inner pot reaches a predetermined temperature, and then energizing only the first sheathed wire heater, the rice cooking time can be reduced. In addition, it is possible to prevent the bottom wall of the inner pot from becoming locally heated in the latter stage of rice cooking, thereby preventing the occurrence of scorching.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cut away vertical sectional view, FIG. 2 is an enlarged vertical sectional view of the main part, and FIG. 3 is a circuit diagram. In the figure, 5 is an inner pot, 6 is a space, 7 is a heat-sensitive device,
17 is a thermostat (temperature detection device), 18 is a first sheathed wire heater, and 19 is a second sheathed wire heater.

Claims (1)

[Scope of utility model registration request] A heating space is provided below the inner pot, and first and second sheathed wire heaters are disposed in this space at a predetermined distance from the inner pot, respectively, and the first and second sheathed wire heaters In a device whose power consumption is set larger than that of the second sheathed wire heater, the thickness of the first sheathed wire heater is made larger than the thickness of the second sheathed wire heater, and the The first and second sheathed wire heaters are connected in parallel and energized at the same time, and when the inner pot reaches a predetermined temperature, the temperature detection device turns off the power to the second sheathed wire heater, and then only the first sheathed wire heater is turned on. A rice cooker characterized by being energized.