JPS5851858Y2 - rice cooker - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electric rice cooker that serves both for cooking rice and keeping it warm.

Some conventional electric rice cookers are known to heat the rice inside the rice cooker indirectly using high-temperature air instead of placing the rice cooker in close contact with the bottom of the rice cooker, but this indirect heating type Although electric rice cookers have excellent uniform heating, they have a problem of low thermal efficiency.

In addition, some conventional rice cookers have a heat-retaining heater installed inside the lid, but when installing a heat-retaining heater inside the lid, the main body side and the lid side must be connected electrically. External wiring for connection is required, which increases the number of parts and complicates the manufacturing process.

This invention has good thermal efficiency and can heat uniformly.
Furthermore, the purpose of this invention is to provide an electric rice cooker whose structure can be simplified by omitting the heat-retaining heater inside the lid.

Hereinafter, the electric rice cooker of the present invention will be explained based on the illustrated embodiment. The electric rice cooker of the embodiment shown in FIG. A main body 1, a lid body 2 which is pivotally attached to the upper part of the container body 1 by a hinge 3 and is composed of a double lid of a lid body 23 and a rice bowl lid 8, and a rice bowl housed in an inner container 5 of the container body 1. 7.

A heat insulating material 20 is provided between the outer case 4 and the inner container 5 of the container body 1.
is installed.

On the bottom 11 of the inner container 5, a rice cooking machine 9 is attached with a spring 2.
2 and is placed in a state where it is urged upward.

This silencer 9 can be moved up and down within an appropriate range, and when the rice bowl 7 is accommodated, it is pressed against the rice bowl bottom 15 and descends.

At this time, the silent portion 9 is urged upward by the spring 22, and the annular projection 9a formed at the buried position of the rice cooker heater 9b comes into close contact with the lower surface of the rice bowl bottom portion 15.

At this time, a non-contact space 32 is formed between the lower surface of the bottom 15 of the rice bowl 7 and the silent portion 9 except for the annular protrusion 9a.

A center thermo 21 for controlling rice cooking heating is arranged in the center of the Mokugen 9.

In this embodiment, the center thermostat 21 is mounted on the inner container 9, but in other embodiments, it may be mounted on the bottom 11 of the inner container.

The upper part of the side wall 12 of the inner container 5 has an annular stepped part 13 facing outward.
is formed.

Further, an annular heat-retaining heater 10 is wound around the outer surface of the inner container side wall 12 in a direction 12a above the annular stepped portion 13.

The upper end opening 16 of the rice bowl 7 has an annular outward 7 flange 17.
are integrally formed.

When the rice bowl I is housed in the inner container 5, this outward flange 17 is placed on the inner container annular stepped portion 13 so as to be in contact with the entire circumference. Vessel 7
The annular space 30 between the two is sealed.

The shape of the upper part of the inner container 5 is determined so that the heat-retaining heater 10 is located above the upper opening 16 of the rice container when the rice container 7 is accommodated.

The upper end opening 16 of the rice bowl 7 is closed by a rice bowl board 8.

This rice bowl lid 8 is supported by a pin 24 at the center of the lower surface of the lid body 23, and the rice bowl lid 8 is opened and closed together with the lid body 23.

A space 31 having an appropriate width is formed between the upper surface of the rice bowl lid 8 and the lower surface of the lid body 23.

Next, to explain the operation of the rice cooker shown in FIG. Gently push down 9 until the flange 17 contacts the inner container annular step 13.

In this state, the silencer 9 is urged upward by the spring 22, and the protrusion 9a of the silencer 9 is in close contact with the lower surface of the rice bowl bottom 15.

Furthermore, since the rice bowl flange 17 is in close contact with the inner container annular stepped portion 13 over the entire circumference, the upper part of the space 30 between the inner container 5 and the rice bowl I is sealed. There is.

Then, when electricity is applied to the rice cooking heater 9b of Silence 9, the heater 9
A part of the heat generated b directly heats the rice bowl bottom 15 as conduction heat via the annular protrusion 9a.

In addition, part of the heat generated by the heater 9b is transferred to the bottom 15 of the rice bowl 9.
The non-contact space 32 between the inner container 5 and the air in the annular space 30 between the rice bowl 7 is heated to indirectly heat the rice bowl 7 from the entire circumference.

In this case, since the annular protrusion 9a is formed at the buried position of the rice cooking heater 9b, the conductive heat from the heater 9b reaches the rice bowl 7 through the shortest heat transfer path.

Therefore, the heat transfer efficiency is improved, and the amount of conduction heat as designed is transferred to the rice bowl I side, making it easy to accurately control the distribution ratio between the amount of direct heating heat and the amount of indirect heating heat.

Therefore, during rice cooking, the rice in the rice bowl I is uniformly heated from the bottom 15 and the side periphery 18 of the rice bowl, so that a uniformly cooked state can be obtained.

In addition, during heat retention, the heat generated by the heat retention heater 10 attached to the outer surface of the upper part of the inner container 5 is released into the upper part 12a of the inner container side wall 12 or into the space 31 between the lower surface of the lid body 23 and the upper surface of the rice bowl lid 8. The rice bowl lid 8 is heated to keep the cooked rice in the rice bowl 7 warm from above, while a portion of the heat from the heat retention heater 10 is transferred from the annular stepped portion 13 of the inner container 7 to the rice bowl flange 17 and around the side of the rice bowl. The heat is conductively transmitted to the portion 18, and the rice side is also kept warm from the rice bowl side peripheral portion 18.

Furthermore, when keeping the rice warm, heating the rice bowl lid 8 has the effect of preventing dew condensation on the lower surface of the rice bowl lid 8.

Next, to explain the effects of the present invention, the rice cooker of the present invention has the following effects.

(1) When the rice bowl 7 is stored, the outward flange 17 of the rice bowl 7 is in close contact with the annular stepped portion 13 of the inner container 5 over the entire circumference, and the space between the inner container 5 and the rice bowl I is annular space 3
0 is sealed, and the bottom 15 of the rice cooker is in contact with the top surface of the rice cooker 9. During cooking, part of the heat from the rice cooker 9 is directly transmitted to the bottom 15 of the rice cooker, and the bottom 15 of the rice cooker is in contact with the top surface of the rice cooker 9. The other part of the heat heats the non-contact space 32 between the rice bowl 7 and the silent space 9 and the air in the annular space 30, and the heated air also indirectly heats the rice bowl side circumference 18. Therefore, the rice in the rice bowl 7 is uniformly heated from its bottom and side periphery, resulting in a uniformly cooked state, and the heating efficiency is improved by direct heat transfer to the bottom of the rice bowl.

In addition, since the rice cooker 7 is in contact with the heat quantity 9 at a position corresponding to the rice cooking heater 9b buried in the heat quantity 9, the rice cooking heater 9
The heat generated in b is transmitted to the rice cooker I through the shortest heat transfer path, which further improves the heating efficiency and makes it easier to obtain the amount of direct heat transfer as designed, which reduces the amount of heat from direct heating and indirect heating. This makes it easier to design the distribution.

(2) Since the heat quantity 9 is disposed so as to be able to move up and down while being urged upward by the spring 22, it can be moved up and down from the height of the inner container annular stepped portion 13 or from the bottom 15 of the rice bowl 7 to the rice bowl flange 17. Even if there is some dimensional error in the height, when the rice bowl flange 17 is placed on the annular stepped part 13, the heat quantity 9 is surely pressed against the lower surface of the rice bowl bottom part 15.

(3) The heat-retaining heater 10 is an annular stepped portion 1 of the inner container side wall 12.
Since the heater is mounted on the outer surface above 3, it is possible to simplify the number of parts and the manufacturing process compared to the case where the heater is mounted inside the lid body as in the conventional example. There is no need to consider the electrical insulation mechanism.

In addition, this heat-retaining heater 10 is located at a height facing the space 31 between the lid 2 and the rice bowl lid 8, and heats the space 31 at the same height while wrapping it from the outside. The heat retention effect is good as there are no parts of the room where the temperature is low.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a rice cooker according to an embodiment of the present invention. 1...Container body, 4...Outer case, 5
...Inner container, 6...Shoulder member, 7...
...Rice bowl, 8...Rice bowl lid, 9...Calorific value for cooking rice, 10...Heater for keeping warm, 11...
... Inner container bottom, 13 ... Annular step, 15.
...Rice bowl bottom, 16...Top opening, 1
7...Outward flange, 22...Spring, 30...Space portion.

Claims (1)

[Scope of utility model registration request] The outer case 4 and the inner container 5 having an outwardly facing annular stepped portion 13 formed on the upper part thereof are connected via a shoulder member 6 to form the container body 1, and a spring 2 is provided on the upper surface of the bottom portion 11 of the inner container 5.
A rice cooking rice cooker 9 is installed which is biased upwardly in a floating state by the inner container 2 and is movable up and down. This rice cooker houses a rice bowl I whose opening 16 can be sealed with a rice bowl lid 8, and further covers the upper part of the container body 1 with a lid body 2. When the rice cooker 7 is housed in the inner container 5, the outer periphery of its bottom 15 contacts the rice cooker 9 in an annular manner at a position corresponding to the rice cooking heater 9b buried in the rice cooker I. The shapes of the bottom 15 of the rice bowl 7 and the silence 9 are determined so that a relatively large non-contact space 32 is formed between the other part of the bottom 15 and the silence 9. In the state where I is housed in the inner container 5, the flange 17 of the rice container 7 is placed on the annular stepped portion 13 of the inner container 5, and the rice container 7 and the inner container 5 are
A sealed space is formed between the inner container 5 and the outer surface of the inner container 5 above the annular step 13.
A rice cooker characterized in that a heat-retaining heater 10 is provided at a height facing a space 31 formed between the lower surface of the rice cooker and the upper surface of the rice cooker lid 8.