JP3633568B2

JP3633568B2 - rice cooker

Info

Publication number: JP3633568B2
Application number: JP2002066462A
Authority: JP
Inventors: 幸一郎山下; 正人佐野; 敏広藤田; 弘大矢; さおり加古
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2002-03-12
Filing date: 2002-03-12
Publication date: 2005-03-30
Anticipated expiration: 2022-03-12
Also published as: JP2003259972A; KR20030074360A; CN1443506A

Description

【０００１】
【発明の属する技術分野】
本発明は、炊飯器本体に収納した鍋で炊飯する炊飯器に関するものである。
【０００２】
【従来の技術】
従来、この種の炊飯器に収納される鍋の内側面形状は、鍋底部分から連なる部分を半径１０ｍｍより大きな曲面でつないだものであった。
【０００３】
【発明が解決しようとする課題】
一般に、炊飯中の米粒が鍋内の水を吸水・膨張する過程において、各米粒の体積の増大に伴い、互いに応力を及ぼすようになり、鍋内において米粒全体として見たとき、上向きおよび鍋中心から外向きへと膨張しようとする。
【０００４】
このとき、前述のような従来の炊飯器の鍋では、鍋内外周部の下層に位置する米粒が鍋内側を滑りあがり、外周部上層の米粒を中心部より高く押し上げる。この現象は鍋内面へのフッ素加工などにより鍋内面が滑りやすいものほど顕著になっている。
【０００５】
その結果、各米粒の吸水に従い水が減少し水面が下がっていくと、中心部上層の米粒に対し、外周部上層の米粒は吸水が十分でないまま炊飯を行なわれることになり、炊きむらの少ない炊飯を実現する事が困難になるという問題があった。
【０００６】
本発明は上記従来の課題を解決するもので、鍋内下層に位置する米粒の吸水・膨張時の鍋中心から外向きへ膨張しようとする力を抑え、外周部下層の米粒が鍋の内側を滑りあがることを抑制し、外周部上層と中心部上層の高さを等しい状態で吸水を行わせることによって炊きむらの少ない炊飯を実現することを目的としている。
【０００７】
【課題を解決するための手段】
本発明は上記目的を達成するために、炊飯器本体と、前記炊飯器本体の上面開口部を覆う蓋と、前記炊飯器本体に収納し加熱手段によって加熱される鍋とを備え、前記鍋は、最小炊飯量と中間炊飯量の２つの炊飯量に対する水位線表記高さで外周部上層と中心部上層の高さを一定とするべく、底部近傍の内側面部に略鉛直部を形成し、前記略鉛直部から鍋の上端にかけて徐々に内径を広げる形状としたものである。
【０００８】
これにより、鍋底からの高さ増加に対する内容量の増加が少なくとも鍋底近傍で一定となり、鍋内下層に位置する米粒の吸水・膨張時の鍋中心から外向きへ膨張しようとする力を抑えて、外周部下層の米粒が鍋の内側を滑りあがることを抑制することができ、外周部上層と中心部上層の高さを等しい状態で吸水を行わせることができて、炊きむらの少ない炊飯を実現することができる。
【０００９】
【発明の実施の形態】
本発明の請求項１に記載の発明は、炊飯器本体と、前記炊飯器本体の上面開口部を覆う蓋と、前記炊飯器本体に収納し加熱手段によって加熱される鍋とを備え、前記鍋は、最小炊飯量と中間炊飯量の２つの炊飯量に対する水位線表記高さで外周部上層と中心部上層の高さを一定とするべく、底部近傍の内側面部に略鉛直部を形成し、前記略鉛直部から鍋の上端にかけて徐々に内径を広げる形状としたものであり、鍋底からの高さ増加に対する内容量の増加が少なくとも鍋底近傍で一定となり、炊飯時に鍋内下層に位置する米粒の吸水・膨張時の鍋中心から外向きへ膨張しようとする力を抑え、外周部下層の米粒が鍋内側を滑りあがることを抑制することができ、また、中層から上層部の米粒の吸水・膨張時の上向きの膨張力による上方への移動時、外向きの膨張力を鍋の内径増加により吸収することができて、上層部の吸水を均一に行なわせることができ、炊きむらの少ない炊飯を実現することができる。
【００１０】
【実施例】
以下、本発明の実施例について、図面を参照しながら説明する。
【００１１】
（実施例１）
図１に示すように、炊飯器本体１は、上面が開口し、この炊飯器本体１の内部に鍋２の収納部である保護枠３を配設し、この保護枠３の外側に加熱手段である誘導コイル４を設け、炊飯器本体１に収納した鍋２を誘導コイル４により誘導加熱するよう構成している。
【００１２】
蓋５は炊飯器本体１の上面開口部を覆うように回動自在に取付けており、内方に、鍋パッキン６を備えた放熱板７を取り付けている。また、鍋２を炊飯器本体１に収納したとき、鍋２に接するように底センサ８を配設している。
【００１３】
ここで、鍋２は、底部近傍の内側面部に略鉛直部２０を形成し、かつ、略鉛直部２０から鍋２の上端２１にかけて徐々に内径を広げる形状としている。
【００１４】
また、図２（ａ）〜（ｈ）は本発明の鍋形状例について、米粒吸水・膨張前後の表面状態の関係を簡単に示した鍋縦方向断面図であり、水９と、米粒と水がある層１０がある。
【００１５】
上記構成において図２を参照しながら動作を説明する。図２（ａ）に示す鍋２は、底部近傍の内側面部を鍋２の全高の約１／８までの高さに略鉛直部２０を５ｍｍ以上設け、かつ、略鉛直部２０から鍋２の上端２１にかけて徐々に内径を広げた形状となっている。
【００１６】
このような鍋２に水と米を入れると、図２（ａ）に示すように、水９と、米粒と水がある層１０が構成される。この状態で炊飯を行うと、図２（ｂ）に示すように、鍋２内の下層に位置する米粒は、吸水・膨張時に、下向きの膨張力は鍋底により打ち消されるため、図２（ｃ）の矢印で示すように、鍋２の中心から上向き・外向きへ膨張しようとする。
【００１７】
この外向きの力を鍋２の略鉛直部２０により抑え、図２（ｄ）の矢印で示すように、上向きのみの膨張にすることで、従来の鍋に見られた外周部下層の米粒が鍋２の内側を滑りあがる現象を抑制できる。ここで、１１は吸水・膨張前の米粒層、１２は吸水・膨張後の米粒層を示している。
【００１８】
また、図２（ｅ）のような中層から上層部の米粒の吸水・膨張時の上下向き・外向きの膨張については、図２（ｆ）のように、外向きの膨張力を高さが上がることによる内径増加で吸収することができる。ここで、１３は内径増加により増えた容積である。
【００１９】
この結果、図２（ｇ）に示すように、特定部分の米粒が盛り上がっていない平坦な表面状態１４が実現でき、各部の米粒の吸水状態が均一となり、炊きむらの少ない炊飯を実現することができる。
【００２０】
（実施例２）
次に、本発明の実施例２について説明する。なお、炊飯器の全体構成は上記実施例１と同じであるので説明を省略する。
【００２１】
図３（ａ）に示すように、鍋２ａは、底部近傍の内側面部に略鉛直部２０を形成し、底面と略鉛直部２０とを半径１０ｍｍ以下の曲面２２で連結し、かつ、鍋底部分から鍋２ａの上端２１にかけて徐々に内径を広げる形状としている。
【００２２】
上記構成において動作を説明する。鍋２ａに水と米を入れると、図３（ａ）に示すように、水９と、米粒と水がある層１０が構成される。この状態で炊飯を行うと、外周部下層の米粒が鍋２ａの内側を滑りあがることを抑制することができ、また、米粒の吸水・膨張時の上向きの膨張力による上方への移動時、外向きの膨張力を内径増加により吸収できて、図３（ｂ）に示すように、平坦な吸水・膨張後の表面状態１４を実現でき、各部の米粒の吸水状態が均一となり、炊きむらの少ない炊飯を実現することができる。
【００２３】
（実施例３）
次に、本発明の実施例３について説明する。なお、炊飯器の全体構成は上記実施例１と同じであるので説明を省略する。
【００２４】
図４（ａ）に示すように、鍋２ｂは、鍋底からの高さ増加に対する内容量の増加が基本的には増加しているが、少なくとも鍋底近傍で一定となる形状としている。すなわち、鍋底からの高さ増加に対する内容量の増加を、２つの炊飯量１５、１６に対する水位線表記高さで一定となる形状としている。
【００２５】
上記構成において動作を説明する。鍋２ｂに水と米を入れると、図４（ａ）に示すように、水９と、米粒と水がある層１０が構成される。この状態で炊飯を行うと、外周部下層の米粒が鍋２ａの内側を滑りあがることを抑制することができ、さらに、その上の内容量を最小炊飯量と中間炊飯量のそれぞれの膨張分に対応し増加させることにより、図４（ｂ）のように膨張分による表面状態１４の変化を的確に防ぐことができ、炊きむらの少ない炊飯を実現することができる。
【００２６】
（実施例４）
次に、本発明の実施例４について説明する。なお、炊飯器の全体構成は上記実施例１と同じであるので説明を省略する。
【００２７】
図５（ａ）に示すように、鍋２ｃは、中央部分２３を外周部分２４より高くなるような底形状としている。
【００２８】
上記構成において動作を説明する。鍋２ｃに水と米を入れると、図５（ａ）に示すように、水９と、米粒と水がある層１０が構成される。この状態で炊飯を行う。ここで、鍋底からの高さ増加に対する内容量の増鍋径に対し、米粒層の厚さが厚いとき、鍋内下層に位置する米粒の吸水・膨張時の鍋２ｃの中心から外向きへ膨張しようとする力を抑えると中央部分の上層の米粒を押し上げる方向に力が発生し中央部分の米粒が高く押し上げられる。
【００２９】
このようなとき、図５（ａ）のように、鍋５ｃを中央部分２３を外周部分２４より高くなるような底形状とすると、吸水前、中央部分２３の米粒層の厚さが薄くなり、前述の現象を未然に防ぐことができ、図５（ｂ）のように中央部分２３と外周部分２４の上層部の吸水・膨張後の高さをあわせ、吸水を均一に行なわせることができ、炊きむらの少ない炊飯を実現することができる。
【００３０】
（実施例５）
次に、本発明の実施例５について説明する。なお、炊飯器の全体構成は上記実施例１と同じであるので説明を省略する。
【００３１】
図６（ａ）に示すように、鍋２ｄは、中央部分２３と外周部分２４の中間部分２５を低くなるような底形状としている。
【００３２】
上記構成において動作を説明する。鍋２ｄに水と米を入れると、図６（ａ）に示すように、水９と、米粒と水がある層１０が構成される。この状態で炊飯を行う。ここで、吸水前、中央部分と外周部分の米粒の層の厚さが薄くなる。中間部分２５の下層の米粒の吸水・膨張時の半径方向への膨張しようとする力により生まれる中央部分２３と外周部分２４の上層の米粒を高く押し上げる力に対し、元々から中央部分２３と外周部分２４に位置する米粒の層を薄くして上向きの膨張力を小さくすることができる。この結果、中央部分２３、外周部分２４、中間部分２５の上層部の吸水・膨張後の高さをあわせ、吸水を均一に行なわせることができ、炊きむらの少ない炊飯を実現することができる。
【００３３】
なお、上記各実施例では、鍋を誘導コイル４により誘導加熱するよう構成しているが、ガス、シーズヒータ、鋳込みヒータ、ハロゲンヒータなどで加熱してももよく、鍋の材質についても、鉄、アルミニウム、ステンレス鋼、クラッド材などでもよい。
【００３４】
【発明の効果】
以上のように本発明の請求項１に記載の発明によれば、炊飯器本体と、前記炊飯器本体の上面開口部を覆う蓋と、前記炊飯器本体に収納し加熱手段によって加熱される鍋とを備え、前記鍋は、最小炊飯量と中間炊飯量の２つの炊飯量に対する水位線表記高さで外周部上層と中心部上層の高さを一定とするべく、底部近傍の内側面部に略鉛直部を形成し、前記略鉛直部から鍋の上端にかけて徐々に内径を広げる形状としたから、鍋底からの高さ増加に対する内容量の増加が少なくとも鍋底近傍で一定となり、炊飯時に鍋内下層に位置する米粒の吸水・膨張時の鍋中心から外向きへ膨張しようとする力を抑え、外周部下層の米粒が鍋内側を滑りあがることを抑制することができ、また、中層から上層部の米粒の吸水・膨張時の上向きの膨張力による上方への移動時、外向きの膨張力を鍋の内径増加により吸収することができて、上層部の吸水を均一に行なわせることができ、炊きむらの少ない炊飯を実現することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施例の炊飯器の断面図
【図２】（ａ）同炊飯器の鍋に水と米を入れた状態の断面図
（ｂ）同炊飯器の鍋の炊飯を開始した状態の断面図
（ｃ）同炊飯器の鍋の米粒下層の膨張状態を示す断面図
（ｄ）同炊飯器の鍋の米粒下層の膨張後の状態を示す断面図
（ｅ）同炊飯器の鍋の米粒上層の膨張状態を示す断面図
（ｆ）同炊飯器の鍋の米粒上層の膨張後の状態を示す断面図
（ｇ）同炊飯器の鍋の米粒吸水後の状態を示す断面図
【図３】（ａ）本発明の第２の実施例の炊飯器の鍋に水と米を入れた状態の断面図
（ｂ）同炊飯器の鍋の米粒吸水後の状態を示す断面図
【図４】（ａ）本発明の第３の実施例の炊飯器の鍋に水と米を入れた状態の断面図
（ｂ）同炊飯器の鍋の米粒吸水後の状態を示す断面図
【図５】（ａ）本発明の第４の実施例の炊飯器の鍋に水と米を入れた状態の断面図
（ｂ）同炊飯器の鍋の米粒吸水後の状態を示す断面図
【図６】（ａ）本発明の第５の実施例の炊飯器の鍋に水と米を入れた状態の断面図
（ｂ）同炊飯器の鍋の米粒吸水後の状態を示す断面図
【符号の説明】
１炊飯器本体
２鍋
４誘導コイル（加熱手段）
５蓋
２０略鉛直部
２１上端[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rice cooker that cooks rice in a pot stored in a rice cooker body.
[0002]
[Prior art]
Conventionally, the inner side surface shape of the pot accommodated in this type of rice cooker has been formed by connecting portions connected from the bottom portion of the pot with a curved surface having a radius larger than 10 mm.
[0003]
[Problems to be solved by the invention]
In general, in the process in which rice grains in cooking rice absorb and expand the water in the pot, as the volume of each rice grain increases, the rice grains become stressed with each other. Attempts to expand outward from
[0004]
At this time, in the pan of the conventional rice cooker as described above, the rice grains located in the lower layer of the outer peripheral portion in the pan slide up the inner side of the pan, and push the rice grains in the upper layer of the outer peripheral portion higher than the central portion. This phenomenon becomes more prominent as the inner surface of the pan becomes slippery due to fluorine processing on the inner surface of the pan.
[0005]
As a result, when the water decreases as the water absorption of each rice grain decreases and the water level decreases, the rice grains in the upper outer peripheral part will be cooked with insufficient water absorption compared to the rice grains in the upper central part, resulting in less uneven cooking. There was a problem that it became difficult to realize cooking rice.
[0006]
The present invention solves the above-mentioned conventional problem, suppresses the force of expanding the rice grains located in the lower layer of the pot from the center of the pot during the water absorption and expansion of the rice grains, The object is to realize rice cooking with less uneven cooking by suppressing sliding up and absorbing water in a state where the outer layer upper layer and the center upper layer are equal in height.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a rice cooker body, a lid that covers the upper surface opening of the rice cooker body, and a pan that is housed in the rice cooker body and heated by heating means. In order to make the height of the outer peripheral part upper layer and the central part upper layer constant at the water level line notation height for the two rice cooking amounts of the minimum rice cooking amount and the intermediate rice cooking amount , a substantially vertical part is formed on the inner side surface near the bottom, The inner diameter gradually increases from the substantially vertical portion to the upper end of the pan.
[0008]
As a result, the increase in the internal capacity with respect to the height increase from the bottom of the pot is constant at least near the bottom of the pot, suppressing the force to expand outward from the center of the pot during water absorption and expansion of the rice grains located in the lower layer of the pot, It is possible to prevent the rice grains in the lower outer circumference from sliding inside the pot, and to absorb water with the height of the upper outer circumference and the central upper layer being equal, realizing rice cooking with less uneven cooking can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Invention of Claim 1 of this invention is equipped with the rice cooker main body, the lid | cover which covers the upper surface opening part of the said rice cooker main body, the pan accommodated in the said rice cooker main body, and heated by a heating means, The said pan Form a substantially vertical portion on the inner side surface near the bottom to make the height of the outer periphery upper layer and the center upper layer constant at the water level line notation height for the two rice cooking amounts of the minimum rice cooking amount and the intermediate rice cooking amount , The inner diameter gradually increases from the substantially vertical part to the top of the pan, and the increase in the internal capacity with respect to the height increase from the bottom of the pan is constant at least near the bottom of the pan. Suppresses the force to expand outward from the center of the pot during water absorption / expansion, prevents the rice grains in the lower outer layer from sliding inside the pot, and absorbs / expands rice grains from the middle to upper layers Upward movement due to upward expansion force Time, it is possible to absorb the forces of expansion outward by the inner diameter increases in the pot, it is possible to uniformly perform the water absorption of the upper portion, it is possible to realize a small cooking of cooking irregularities.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
(Example 1)
As shown in FIG. 1, the rice cooker main body 1 has an open top surface, a protective frame 3 that is a storage portion of the pan 2 is disposed inside the rice cooker main body 1, and heating means is provided outside the protective frame 3. The induction coil 4 is provided, and the pot 2 housed in the rice cooker body 1 is induction-heated by the induction coil 4.
[0012]
The lid 5 is rotatably attached so as to cover the upper surface opening of the rice cooker body 1, and a heat radiating plate 7 provided with a pot packing 6 is attached inside. Moreover, when the pan 2 is stored in the rice cooker body 1, the bottom sensor 8 is disposed so as to contact the pan 2.
[0013]
Here, the pan 2 has a shape in which the substantially vertical portion 20 is formed on the inner side surface near the bottom, and the inner diameter gradually increases from the substantially vertical portion 20 to the upper end 21 of the pan 2.
[0014]
2 (a) to (h) are cross-sectional views in the vertical direction of the pan showing the relationship between the surface condition before and after the rice grain water absorption / expansion in the pan shape example of the present invention. There is a layer 10.
[0015]
The operation of the above configuration will be described with reference to FIG. The pan 2 shown in FIG. 2A has an inner side surface near the bottom at a height of about 1/8 of the total height of the pan 2 with a substantially vertical portion 20 of 5 mm or more, and from the substantially vertical portion 20 to the pan 2. The inner diameter gradually increases toward the upper end 21.
[0016]
When water and rice are put into such a pot 2, as shown in FIG. 2A, a layer 9 having water 9 and rice grains and water is formed. When rice is cooked in this state, as shown in FIG. 2 (b), the rice grains located in the lower layer in the pan 2 have their downward expansion force canceled by the pan bottom during water absorption / expansion. As shown by the arrow, it tries to expand upward and outward from the center of the pan 2.
[0017]
This outward force is suppressed by the substantially vertical portion 20 of the pan 2, and as shown by the arrow in FIG. 2 (d), the rice grains in the lower layer of the outer peripheral portion seen in the conventional pan are made to expand only upward. The phenomenon of sliding up inside the pot 2 can be suppressed. Here, 11 indicates the rice grain layer before water absorption / expansion, and 12 indicates the rice grain layer after water absorption / expansion.
[0018]
In addition, as shown in FIG. 2 (e), the upward and downward expansion during the water absorption / expansion of the rice grains from the middle layer to the upper layer is increased in the outward expansion force as shown in FIG. 2 (f). It can be absorbed by increasing the inner diameter by going up. Here, 13 is the volume increased by the increase in the inner diameter.
[0019]
As a result, as shown in FIG. 2 (g), a flat surface state 14 in which the rice grains of specific portions are not raised can be realized, the water absorption state of the rice grains in each part is uniform, and rice cooking with less uneven cooking can be realized. it can.
[0020]
(Example 2)
Next, a second embodiment of the present invention will be described. In addition, since the whole structure of a rice cooker is the same as the said Example 1, description is abbreviate | omitted.
[0021]
As shown to Fig.3 (a), the pan 2a forms the substantially vertical part 20 in the inner surface part of the bottom vicinity, connects the bottom face and the substantially vertical part 20 with the curved surface 22 with a radius of 10 mm or less, and a pot bottom part To the upper end 21 of the pan 2a.
[0022]
The operation in the above configuration will be described. When water and rice are put into the pot 2a, as shown in FIG. 3 (a), a layer 9 having water 9 and rice grains and water is formed. When rice is cooked in this state, it is possible to prevent the rice grains in the lower outer peripheral portion from sliding up inside the pot 2a, and when the rice grains move upward due to the upward expansion force during water absorption and expansion, The expansion force in the direction can be absorbed by the increase in the inner diameter, and as shown in FIG. 3B, the surface state 14 after flat water absorption / expansion can be realized, the water absorption state of the rice grains in each part is uniform, and there is little uneven cooking Cooking rice can be realized.
[0023]
(Example 3)
Next, Embodiment 3 of the present invention will be described. In addition, since the whole structure of a rice cooker is the same as the said Example 1, description is abbreviate | omitted.
[0024]
As shown to Fig.4 (a), although the increase in the internal volume with respect to the height increase from a pan bottom has increased fundamentally, the pan 2b is made into the shape which becomes fixed at least in the pan bottom vicinity. That is, the increase in the internal capacity with respect to the height increase from the bottom of the pan is a shape that is constant at the water line notation height for the two cooked rice amounts 15 and 16.
[0025]
The operation in the above configuration will be described. When water and rice are put into the pot 2b, as shown in FIG. 4A, a layer 9 having water 9 and rice grains and water is formed. If rice is cooked in this state, it can suppress that the rice grain of an outer peripheral part lower layer slips up inside the pot 2a, Furthermore, the content on it is made into each expansion | swelling part of minimum rice cooking amount and intermediate | middle rice cooking amount. By correspondingly increasing, as shown in FIG. 4 (b), the change of the surface state 14 due to the expansion can be prevented accurately, and rice cooking with less uneven cooking can be realized.
[0026]
(Example 4)
Next, a fourth embodiment of the present invention will be described. In addition, since the whole structure of a rice cooker is the same as the said Example 1, description is abbreviate | omitted.
[0027]
As shown in FIG. 5A, the pan 2 c has a bottom shape in which the central portion 23 is higher than the outer peripheral portion 24.
[0028]
The operation in the above configuration will be described. When water and rice are put into the pot 2c, as shown in FIG. 5 (a), a layer 9 having water 9 and rice grains and water is formed. Cook rice in this state. Here, when the thickness of the rice grain layer is thicker than the pot diameter of the inner volume with respect to the height increase from the bottom of the pan, the rice grain located in the lower layer of the pan expands outward from the center of the pot 2c during water absorption and expansion. When the force to be suppressed is suppressed, a force is generated in the direction of pushing up the upper rice grains in the central portion, and the rice grains in the central portion are pushed up higher.
[0029]
In such a case, as shown in FIG. 5 (a), when the pan 5c has a bottom shape such that the central portion 23 is higher than the outer peripheral portion 24, the thickness of the rice grain layer of the central portion 23 is reduced before water absorption, The above-mentioned phenomenon can be prevented in advance, and the height after water absorption / expansion of the upper portion of the central portion 23 and the outer peripheral portion 24 can be matched as shown in FIG. Cooked rice with less uneven cooking can be realized.
[0030]
(Example 5)
Next, a fifth embodiment of the present invention will be described. In addition, since the whole structure of a rice cooker is the same as the said Example 1, description is abbreviate | omitted.
[0031]
As shown to Fig.6 (a), the pan 2d is made into the bottom shape which becomes low the intermediate part 25 of the center part 23 and the outer peripheral part 24. As shown in FIG.
[0032]
The operation in the above configuration will be described. When water and rice are put into the pot 2d, as shown in FIG. 6A, a layer 9 having water 9 and rice grains and water is formed. Cook rice in this state. Here, before water absorption, the thickness of the rice grain layer at the central portion and the outer peripheral portion is reduced. The central portion 23 and the outer peripheral portion from the beginning with respect to the force that pushes up the rice grains in the upper portion of the central portion 23 and the outer peripheral portion 24 generated by the force of the rice grains in the lower layer of the intermediate portion 25 in the radial direction during water absorption and expansion. The rice grain layer located at 24 can be thinned to reduce the upward expansion force. As a result, the height of the upper layer portion of the central portion 23, the outer peripheral portion 24, and the intermediate portion 25 after water absorption / expansion can be matched, water absorption can be performed uniformly, and rice cooking with less uneven cooking can be realized.
[0033]
In each of the above embodiments, the pan is configured to be induction-heated by the induction coil 4, but may be heated by a gas, a sheathed heater, a cast-in heater, a halogen heater, or the like. Aluminum, stainless steel, clad material, etc. may be used.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the rice cooker body, the lid that covers the upper surface opening of the rice cooker body, and the pot that is housed in the rice cooker body and heated by the heating means. And the pan is approximately on the inner side surface near the bottom to keep the height of the upper peripheral layer and the upper upper layer constant at the water level line notation height for the two rice cooking amounts of the minimum rice cooking amount and the intermediate rice cooking amount. The vertical part is formed, and the inner diameter gradually increases from the substantially vertical part to the top of the pan. Suppresses the force to expand outward from the center of the pot during water absorption and expansion of the located rice grains, prevents the rice grains in the lower outer periphery from sliding up inside the pot, and the rice grains from the middle to upper layers Due to upward expansion force during water absorption and expansion When moving upwards, the expansion force of the outward can be absorbed by the inner diameter increases in the pot, it is possible to uniformly perform the water absorption of the upper portion, it is possible to realize a small cooking of cooking irregularities.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rice cooker according to a first embodiment of the present invention. FIG. 2 (a) is a cross-sectional view of water and rice put in the rice cooker pot. Cross-sectional view of the state where rice cooking is started (c) Cross-sectional view showing the expanded state of the rice grain lower layer of the rice cooker pot (d) Cross-sectional view showing the state after the rice grain lower layer of the rice cooker pot expanded (e) Cross-sectional view showing the expanded state of the rice grain upper layer of the rice cooker pot (f) Cross-sectional view showing the state after the expansion of the rice grain upper layer of the rice cooker pot (g) shows the state after the rice grain water absorption of the rice cooker pot Sectional view [FIG. 3] (a) A sectional view of the rice cooker pot of the second embodiment of the present invention in a state where water and rice are put in. (B) A sectional view showing the state of the rice cooker pot after water absorption of rice grains. [Fig. 4] (a) A cross-sectional view of the rice cooker pot of the third embodiment of the present invention in a state where water and rice are put in. (B) A cross-sectional view showing the state of the rice cooker pot after water absorption of rice grains. FIG. 5 (a) of the present invention Sectional drawing of the state which put water and rice in the pot of the rice cooker of Example of 4 (b) Sectional drawing which shows the state after the rice grain water absorption of the pot of the rice cooker [FIG. 6] (a) 5th of this invention Sectional view of the state where water and rice are put in the pot of the rice cooker of the embodiment of (b) Cross-sectional view showing the state after water absorption of rice grains in the pot of the rice cooker [Explanation of symbols]
1 Rice cooker body 2 Pot 4 Induction coil (heating means)
5 Lid 20 Substantially vertical part 21 Upper end

Claims

And rice cooker body, a lid for covering an upper opening of the rice cooker main body, and a pan which is heated by the heating means is accommodated in the rice cooker body, the cooker, the minimum cooking amount and the intermediate rice amounts of the two In order to make the height of the outer layer upper layer and the center upper layer constant at the water level line notation height relative to the amount of cooked rice, a substantially vertical part is formed on the inner side surface near the bottom, and the inner diameter gradually increases from the substantially vertical part to the upper end of the pan. Rice cooker with a shape that spreads out.