JPH0423465Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to an electric rice cooker that has both a rice cooking function and a warming function.

<Conventional technology> Conventionally, electric rice cookers that have both rice cooking and heat retention functions include an inner container provided inside an outer case, an inner pot housed in the inner container, and a bottom heater placed below the inner pot. There has been provided a device in which the bottom heater is embedded in a metal hot plate with high thermal conductivity. In an electric rice cooker like this, when cooking rice, the inner pot is heated from the bottom side by placing it on the heating plate, and when keeping warm, the inner pot is heated from the bottom side separately from the bottom heater. The inner pot is heated from the side by a side heater provided on the side.

By the way, when rice is generally cooked in an electric rice cooker, the inner pot is heated at a uniform temperature while the inner pot is wrapped around the sides and below, which is what is called kamado cooking. It is known to make delicious rice.

<Problem to be solved by the invention> However, in the electric rice cooker mentioned above, when cooking rice, the inner pot is only heated at the contact surface between the bottom of the inner pot and the hot plate in which the bottom heater is embedded.
There was a problem in that there was a temperature difference between the bottom and sides of the inner pot, making it impossible to cook the rice stored in the inner pot evenly, and ultimately making it impossible to cook delicious rice.

In addition, in order to keep the rice stored in the inner pot well warmed, it is necessary to heat the inner pot from the side by energizing not only the bottom heater but also the side heater. However, there was a problem in that the number of parts increased as side heaters had to be installed, resulting in higher costs.

This idea was made in view of these problems, and by wrapping the inner pot and heating it, it is possible to cook delicious rice, and
To provide an electric rice cooker which can keep rice in a good heat-retaining state without providing a side heater and is inexpensive because the side heater is removed.

<Means for solving the problem> The electric rice cooker of this invention to solve the above problem includes an inner container provided inside an outer case, an inner pot housed in the inner container, and an inner pot. It is equipped with a metal hot plate with high thermal conductivity provided below and a bottom heater embedded in this hot plate, and the inner pot is placed on the hot plate and the electric pot is heated from the bottom side. The heating container is characterized in that a predetermined area of the bottom of the inner container is embedded in a hot plate.

<Function> According to the electric rice cooker having the above configuration, a predetermined area of the bottom of the inner container is embedded in a metal hot plate with high thermal conductivity, so that the heat of the bottom heater is transferred to the bottom of the inner container. Heat can be transferred from side to side. Therefore, by heating the inner pot with radiant heat from the side of the inner container, it is possible to heat the side of the inner pot to approximately the same temperature as the bottom, or to warm it up. can.

<Example> Hereinafter, an example will be described in detail based on the accompanying drawings showing an example.

FIG. 1 is a longitudinal sectional view showing an electric rice cooker according to this invention. In the figure, the electric rice cooker includes a side member 2 made of a thin metal plate, a bottom member 3 made of synthetic resin formed on the lower side of this side member 2, and a synthetic resin made on the upper side of the side member 2. a substantially cylindrical outer case 1 consisting of a shoulder portion 4;
A lid unit 7 that can freely open and close the top surface of this outer case 1
It is mainly composed of.

The outer case 1 has a cylindrical inner container 5 inside.
In addition, inside this inner container 5,
An inner pot 6 for cooking rice is removably housed. Further, in the center of the bottom of the inner container 5, a penetration portion 52a is provided.
The inner pot 6 is formed in this penetrating portion 52a.
A center sensor 52 is provided to sense the bottom surface temperature. Furthermore, below the inner pot 6,
A disk-shaped hot plate 53 with a central portion penetrated is provided, and the center sensor 52 is attached to the hot plate 53. Inside the hot plate 53, in a state surrounding the center sensor 52, substantially the entire surface of the bottom portion 50 of the inner container 5 excluding the penetrating portion 52a and the inner pot 6 are provided.
A bottom heater 54 for heating is embedded. Note that a heat insulating material 51 is disposed outside the side of the inner container 5 to prevent heat radiation.

The hot plate 53 is made of a metal material such as aluminum having high thermal conductivity, and is formed by casting. Further, the hot plate 53 is fixed to the bottom member 3 by a fixing member 55 such as a screw through a bush 55a made of a material with excellent heat insulation properties at the lower part thereof.

The bottom portion 50 of the inner container 5 is integrally formed when the hot plate 53 is cast. Further, the mouth edge 5a of the inner container 5 is suspended from a hanging ring 5b having a substantially S-shaped cross section hanging from the shoulder 4, and a bottom heater is provided between the inner container 5 and the hanging ring 5b. 5
In order to prevent heat from being transferred to the shoulder portion 4, a packing 10 made of rubber or plastic is interposed.

In the lid unit 7, a locking mechanism 70 that can be engaged with the outer case 1 is arranged on the front side, and a hinge that can be freely connected to the outer case 1 is arranged on the rear side opposite to the locking mechanism 70. A mechanism 71 is provided. Further, a steam exhaust port 72 is provided in the center of the lid unit 7, and a one-touch gasket 73 is provided below the steam exhaust port 72.
is installed. Furthermore, an inner lid 9 is provided on the lower surface of the lid unit 7 to cover the upper surface of the inner pot 6.

The inner cover 9 is entirely made of a material with high thermal conductivity, for example, metal such as aluminum, and a one-touch pin 75 with a built-in pressure regulator 74 is installed in the center of the upper surface of the inner cover 9. It is fixed by a fixing member such as a screw. The inner lid 9 is detachably attached to the one-touch gasket 73 of the lid unit 7. Further, the peripheral edge portion 9a of the inner lid 9 is the upper surface of the shoulder portion 4, and is suspended from the upper surface of the shoulder portion 4. In addition, the lid unit 7
A gasket 76 attached to a predetermined position on the lower surface of the lid unit 7 seals the space between the inner lid 9 and the lid 9 to prevent steam from leaking to the outside from sources other than the pressure regulator 74.

The inner pot 6 is made of metal with high thermal conductivity,
The mouth edge 60 projects higher than the upper surface of the shoulder 4. This is because when the inner pot 6 is covered with the inner lid 9, the annular packing 9b attached to the predetermined position of the inner pot 9 is brought into contact with the mouth edge 60 of the inner pot 6.
This is to prevent steam from escaping between the mouth edge 60 and the inner lid 9.

The front part of the shoulder part 4 is provided with an operation part (not shown) for manually controlling rice cooking conditions from the outside, a liquid crystal panel 21 for displaying the heating state, and the like. Further, an annular exposed heater 8 is provided on the upper surface of the shoulder portion 4 to prevent dew from forming on the lower surface of the inner lid 9, and a peripheral edge 9a of the inner lid 9 covers the exposed heater 8. The inner lid 9 is indirectly heated by contacting the metal exterior body 81. Further, electrical components such as a power supply board 22 are housed as a unit in a box body 23 directly below the shoulder portion 4 and between the outer case 1 and the inner container 5.

The exposed heater 8 is covered with a metal cylindrical body 80 with good heat conduction, and this cylindrical body 80
is housed in a metal annular exterior body 81.
Furthermore, a shoulder ring 82 made of a synthetic resin having heat insulating properties is provided on the inner peripheral side of the shoulder portion 4, and this shoulder ring 82 is located on the side (inner peripheral side) of the exterior body 81 that is close to the inner pot 6. It is fitted into the shoulder portion 4 together with the exterior body 81 in a covered state. Note that the cylindrical body 80
The upper surface of the outer casing 81 is formed flat in order to enhance the heat transfer effect to the peripheral edge 9a of the inner lid 9.

With the above configuration, since the bottom part 50 of the inner container 5 is embedded in the metal hot plate 53 with high thermal conductivity, the side part of the inner container 5 is heated similarly to the bottom part 50 by the bottom heater 54. Can be heated. Therefore, the entire periphery of the side portion of the inner pot 6 can be heated by radiant heat under substantially the same temperature conditions as the bottom surface of the inner pot 6. Therefore, when cooking rice, it is possible to perform so-called corner cooking, in which the sides of the inner pot 6 are heated while being wrapped, and as a result, delicious rice can be cooked evenly.

In addition, since the inner pot 6 can be heated over its entire surface even when keeping warm, the side heater that was conventionally provided on the outer surface of the inner container 5 is no longer necessary, and the cost of the electric rice cooker can be reduced accordingly. I can do it.

At this time, the entire surface of the inner container 5 becomes high temperature, but since the mouth edge 5a of the inner container 5 is suspended from the hanging ring 5b attached to the shoulder 4 via the packing 10, the temperature of the bottom heater 54 increases. Since the heat is not transferred to the shoulder portion 4, it is possible to prevent the synthetic resin shoulder portion 4 from melting due to high heat. Moreover, since the hot plate 53 is fixed via a bush 55a with excellent heat insulation provided on the lower side, the hot plate 53
It is possible to prevent the heat from No. 3 from being transmitted downward.

Furthermore, since the inner container 5 is embedded within the hot plate 53, even if water spills inside the inner container 5,
It is possible to prevent water from entering the lower side of the inner container 5, and it is possible to prevent the insulating parts of electrical components from deteriorating.

Moreover, since the space where the inner container was conventionally installed separately from the heating plate is now available below the heating plate, the height of the outer case 1 can be reduced by that amount, allowing for the miniaturization of the electric rice cooker. can be achieved.

Then, the side of the exterior body 81 that is close to the inner pot 6 is
Since it is covered with a shoulder ring 82 made of synthetic resin, the exterior body 81 housing the exposed heater 8 is not exposed near the mouth edge 60 of the inner pot 6, so that when the inner pot 6 is taken out from the inner container 5, , fingertips, etc. can be prevented from coming into contact with the exterior body 81 and getting burned.

FIG. 2 is an enlarged sectional view of main parts showing another embodiment. In the figure, the difference from the previous embodiment is that the bottom part 50 of the inner container 5 is connected to a pair of upper and lower heating plates 53.
The hot plates 53a and 53b are buried in a state where they are held together by the hot plates 53a and 53b, and fixed by a plurality of fixing members such as screws.
and the bottom part 50 of the inner container 5 are crimped together. In this case, as in the above embodiment, the side part of the inner container 5 is heated to approximately the same temperature as the bottom part 50,
Alternatively, it can be heated.

Note that this invention is not limited to these embodiments. For example, the inner container 5 may be placed on the hot plate 53 while straddling not only the bottom 50 of the inner container 5 but also the side of the inner container 5. In addition, various design changes can be made without changing the gist of the invention.

<Effects of the invention> As described above, according to the electric rice cooker according to the invention, since a predetermined area of the bottom of the inner container is embedded in a metal hot plate with high thermal conductivity, the bottom of the inner container Not only that, but also the side portions can be heated using a bottom heater. For this reason, when cooking rice, it is possible to heat the rice by wrapping it around the sides of the inner pot, which is what is known as kamado cooking.
Therefore, the rice stored in the inner pot can be cooked evenly, and in turn, delicious rice can be cooked.

In addition, since the inner pot can be heated entirely,
This eliminates the need for the side heater that was conventionally used for heat retention, reduces the number of parts, and has the unique effect of reducing the cost of the electric rice cooker.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of an electric rice cooker according to this invention, and FIG. 2 is an enlarged longitudinal cross-sectional view of main parts showing another embodiment. 1...outer case, 5...inner container, 6...inner pot,
53, 53a, 53b...heat plate, 54...bottom heater, 50...bottom of inner container.

Claims (1)

[Scope of utility model registration request] An inner container installed inside the outer case, an inner pot housed in this inner container, a metal hot plate with high thermal conductivity placed below the inner pot, and a bottom heater embedded in this hot plate. An electric heating container for heating the inner pot from the bottom side by placing the inner pot on a hot plate, characterized in that a predetermined range of the bottom of the inner container is embedded in the hot plate. Electric rice cooker.