JPS5845610Y2 - electric cooker - Google Patents

Description

【考案の詳細な説明】 本考案は外鍋内に内鍋を収納自在にした電気炊飯器の様
な電気調理器に関し、特に熱盤の熱膨張に関係なく常に
美味しい御飯等の被調理物の調理を行なうものである。[Detailed description of the invention] This invention relates to an electric cooking device such as an electric rice cooker in which an inner pot can be freely stored inside an outer pot, and is particularly suitable for cooking food such as rice that always tastes delicious regardless of the thermal expansion of the heating plate. It is used for cooking.

電気炊飯器は一般には第１図の様にフレーム１と該フレ
ーム内に装着した外鍋２と、該外鍋に収納自在にされた
底面が平坦な内鍋３と、前記フレームに一側を枢支し前
記外鍋及び内鍋の開口部を開閉自在にする蓋体４と、前
記外鍋の内底部に固定した熱盤５とから構成されており
、前記内鍋を外鍋内に収納すると共に前記熱盤に内鍋の
底面の略全面を載置して該内鍋を加熱するものである。Generally, as shown in Fig. 1, an electric rice cooker has a frame 1, an outer pot 2 mounted in the frame, an inner pot 3 with a flat bottom that can be stored in the outer pot, and one side attached to the frame. It is composed of a lid body 4 which is pivotably supported and allows the openings of the outer pot and the inner pot to be opened and closed, and a heating plate 5 fixed to the inner bottom of the outer pot, and the inner pot is stored in the outer pot. At the same time, substantially the entire bottom surface of the inner pot is placed on the heating plate to heat the inner pot.

しかし乍ら、前記熱盤はアルミニウム合金５′の外側に
リング状のシーズヒーター６を埋設して円環状に形成し
て使用するために第２図の様にシーズヒーターの通電前
は熱盤はイの様に水平状態であり全面が内鍋の底面に接
触している。However, since the heating plate is formed into an annular shape by embedding a ring-shaped sheathed heater 6 on the outside of the aluminum alloy 5', the heating plate is not energized before the sheathed heater is energized as shown in Fig. 2. As shown in A, it is in a horizontal state and the entire surface is in contact with the bottom of the inner pot.

通電初期（炊飯開始直後）は口の様にシーズヒーターの
通電発熱により該シーズヒーターが熱膨張しリング状部
の径を大きくする如くに働らくがアルミニウム合金は充
分にシーズヒーターの熱が伝達されていないためにシー
ズヒーターに比べ熱膨張が少なく通電前の位置より（−
△ｈ、）だけその内側が下方に変位する。At the beginning of energization (immediately after the start of cooking), the sheathed heater expands thermally due to the heat generated by the energization and increases the diameter of the ring-shaped part, but the heat of the sheathed heater is not sufficiently transferred to the aluminum alloy. Because the heater is not
Its inner side is displaced downward by Δh, ).

そして、炊飯の進行に伴ない炊飯が完了する時点ではへ
の様にシーズヒーターの熱が伝達してアルミニウム合金
が熱膨張して前述とは反対に熱盤の内側が通電前の位置
より（＋△ｈ２）だけ上方に変位する。As the rice cooking progresses, at the point when the rice cooking is completed, the heat of the sheathed heater is transferred and the aluminum alloy thermally expands, and contrary to the above, the inside of the heating plate is lower than the position before electricity is applied (+ It is displaced upward by Δh2).

更に炊飯の完了後に熱盤の温度がシーズヒーターの通電
前の温度に戻った時は熱盤の上面はほぼ初期の位置に復
元するが初期の位置より（＋Δｈａ）だけ永久歪として
残り、長期の使用に伴ないこの（十△ｈ３）は徐々に大
きくなる。Furthermore, when the temperature of the heating plate returns to the temperature before the sheathed heater was energized after rice cooking is completed, the top surface of the heating plate returns to almost its initial position, but it remains permanently deformed by (+Δha) from its initial position, causing long-term damage. This (10Δh3) gradually increases with use.

これはシーズヒーターはその構造が鉄製のパイプにニク
ロム線とマグネシアを内装したものであるために前述の
鉄とシーズヒーターを鋳込むアルミニウム合金との熱膨
張係数が異なり上述の様な変形を行なうことになった。This is because the structure of the sheathed heater is an iron pipe with nichrome wire and magnesia inside, so the thermal expansion coefficients of the above-mentioned iron and the aluminum alloy into which the sheathed heater is cast are different, causing the above-mentioned deformation. Became.

而して、前述の様な熱盤の変位時に内鍋との接触は不安
定となり長期の使用に伴ない（＋△ｈ３）が増加して炊
飯時に内鍋の底面はその中央部側のみが（十△ｈ３）で
変位した熱盤の内側に接触し熱盤の外側は接触しない結
果となる。Therefore, when the heating plate is displaced as mentioned above, the contact with the inner pot becomes unstable, and (+△h3) increases with long-term use, so that only the center side of the bottom of the inner pot becomes unstable during rice cooking. (10△h3), the result is that it comes into contact with the inside of the displaced hot plate, but does not come into contact with the outside of the hot plate.

このため常時熱盤に接触している内鍋の中央側は炊き過
ぎとなり接触のない外側は加熱不足となって炊飯完了後
に上面中央部が山形に盛り上がった不均一な御飯ができ
た。As a result, the center of the inner pot, which was in constant contact with the heating plate, was overcooked, and the outside, which was not in contact, was undercooked, resulting in uneven rice with a mountain-shaped bulge in the center of the top after the rice was cooked.

本考案は上記の欠点を改良するもので以下第３図及び第
４図の図面について説明すると、７は底面の中央部に上
方に突出する貫通孔８を穿設した膨出部９を有する有底
筒状の外鍋、１０は前記外鍋７の内底面に固定した中央
に円孔１１を有する円環状でアルミニウム合金製の熱盤
で、熱源としてリング状のシーズヒーター１２を埋設す
ると共に該シーズヒーター１２の位置する上面より内側
に上方に突出する連続した突出部１３を一体成形し、更
に外径寸法を前記外鍋７の内径と略同−に設定している
。The present invention is intended to improve the above-mentioned drawbacks, and will be explained below with reference to the drawings of FIGS. The bottom cylindrical outer pot 10 is an annular aluminum alloy heating plate having a circular hole 11 in the center fixed to the inner bottom surface of the outer pot 7, and has a ring-shaped sheathed heater 12 buried therein as a heat source. A continuous protrusion 13 that protrudes inward and upward from the upper surface where the sheathed heater 12 is located is integrally molded, and its outer diameter is set to be approximately the same as the inner diameter of the outer pot 7.

１４は前記外鍋７内に収納自在に設けられた内鍋で、そ
の底面を上方に湾曲した湾曲部１５を設けその中央部を
最も突出せしめている。Reference numeral 14 denotes an inner pot that can be freely stored in the outer pot 7. The bottom surface of the inner pot 14 is provided with an upwardly curved curved portion 15, with the center portion protruding the most.

前記湾曲部１５は熱盤１０の上面と湾曲部１５の最上部
間の寸法ｌを前記熱盤１０の内側が炊飯完了前における
上方への変位分（＋△ｈ２）と永久歪として残る（＋△
ｈ３）とを加えた値（△ｈ２＋△ｈ３）より大きくなる
様に設定している。The curved portion 15 has a dimension l between the upper surface of the heating platen 10 and the top of the curved portion 15, which is equal to the upward displacement (+△h2) of the inside of the heating platen 10 before the rice cooking is completed, and the remaining permanent strain (+ △
h3) is set to be larger than the sum of (△h2+△h3).

１６は前記膨出部９内に設置した感熱体で、スプリング
１７により常時貫通孔８より突出する如く附勢している
。Reference numeral 16 denotes a heat sensitive element installed in the bulged portion 9, which is always urged by a spring 17 so as to protrude from the through hole 8.

１８は前記熱盤１０の円孔１１の孔壁と膨出部９の外側
壁間に介装せしめたバッキングである。Reference numeral 18 denotes a backing interposed between the hole wall of the circular hole 11 of the heating plate 10 and the outer wall of the bulging portion 9.

次に熱盤の固定構造及び作用効果について述べると、熱
盤１０の固定は該熱盤１０の下面に設けた取付ボス（図
示せず）を外鍋７の内底面に螺合固定するわけであるが
、この固定に伴ない熱盤１０が外鍋７の円底面側に寄せ
られるために熱盤１０の外周縁部が外鍋７の内壁に密着
すると共にバッキング１８を円孔１１の孔壁と膨出部９
間で挟圧する。Next, to describe the fixing structure and function and effect of the hot platen, the hot platen 10 is fixed by screwing and fixing a mounting boss (not shown) provided on the bottom surface of the hot platen 10 to the inner bottom surface of the outer pot 7. However, as the hot platen 10 is moved closer to the circular bottom surface of the outer pot 7 due to this fixing, the outer periphery of the hot platen 10 comes into close contact with the inner wall of the outer pot 7 and the backing 18 is pressed against the hole wall of the circular hole 11. and bulge 9
Pressure is applied in between.

そして外鍋７内に米、水を収容した内鍋１４を収納し該
内鍋１４の底面の外側部（湾曲部１５の外側）を前記熱
盤１０の突出部１３に載置する。Then, the inner pot 14 containing rice and water is housed in the outer pot 7, and the outer part of the bottom surface of the inner pot 14 (the outer side of the curved part 15) is placed on the protruding part 13 of the heating plate 10.

この時内鍋１４と熱盤１０は突出部１３によって接触し
膨出部９より突出した感熱体１６はスプリング１７によ
りその頭部を湾曲部１５の中央部に密着する。At this time, the inner pot 14 and the heating plate 10 come into contact with each other through the protrusion 13, and the heat sensitive element 16 protruding from the bulge 9 brings its head into close contact with the center of the curved portion 15 by the spring 17.

而して、今、シーズヒーター１２に通電して熱盤１０を
加熱すると、通電初期においては第２図の口の様に熱盤
の内側が下方に変位し、炊飯完了前にはへの様にその内
側が上方に変位した炊飯完了後に内側が上方に変位した
（＋△ｈ３）分が永久歪として残るが、上述の様な変位
時において内鍋１４の底面は熱盤１０の突出部１３と線
接触しているためにその変位とは全く無関係であり常に
安定した熱伝達を行なう。Therefore, when electricity is applied to the sheathed heater 12 and the heating plate 10 is heated, the inside of the heating plate will be displaced downward as shown in the opening in Fig. 2 at the initial stage of energization, and the inside of the heating plate will be displaced downward before the rice cooking is completed. After the cooking is completed, the upward displacement (+△h3) of the inner side remains as a permanent strain, but when the inner pot 14 is displaced as described above, the bottom surface of the inner pot 14 is distorted by the protrusion 13 of the heating plate 10. Since it is in line contact with the heat exchanger, it is completely unrelated to its displacement and always carries out stable heat transfer.

そして永久歪として残った（＋△ｈ３）の変位分も内鍋
１４の湾曲部１５内で抑えられるために熱盤１０の内側
が内鍋１４の底面に接触することなく内鍋１４の中央部
における過熱を防止する。Since the displacement (+△h3) remaining as permanent strain is also suppressed within the curved part 15 of the inner pot 14, the inside of the heating plate 10 does not come into contact with the bottom surface of the inner pot 14, and the center of the inner pot 14 Prevent overheating.

更に炊飯時において内鍋１４の底面は突出部１３との接
触部により側面は熱盤１０の外周縁と外鍋７の内壁との
接触によって熱盤１０より伝達した外鍋７の熱で加熱す
るために内鍋１４の外壁面を効果的に加熱し均一な炊き
上げを行なうと共に冬季等における外気温の低下時にお
いて炊飯動作の立上がりを迅速にする。Furthermore, during rice cooking, the bottom surface of the inner pot 14 is heated by the heat from the outer pot 7 transferred from the heating plate 10 due to the contact part with the protruding part 13 and the side surface by the contact between the outer periphery of the heating plate 10 and the inner wall of the outer pot 7. Therefore, the outer wall surface of the inner pot 14 is effectively heated to achieve uniform cooking, and the rice cooking operation starts quickly when the outside temperature drops such as in winter.

又、前記内鍋１４の底面と熱盤１０の突出部１３との接
触位置はシーズヒーター１２の位置より内側に設定する
ことにより、シーズヒーター１２の熱は該シーズヒータ
ー１２を中心として第３図の左側（外側）て伝導する熱
は外鍋７の内壁に伝達され右側（内側）に伝導する熱は
突出部１３を介して内鍋１４を加熱することになりシー
ズヒーター１２の発生熱を有効に各部に伝達せしめる。Furthermore, by setting the contact position between the bottom surface of the inner pot 14 and the protrusion 13 of the heating plate 10 inside the position of the sheathed heater 12, the heat of the sheathed heater 12 is distributed around the sheathed heater 12 as shown in FIG. The heat conducted to the left side (outside) is transferred to the inner wall of the outer pot 7, and the heat conducted to the right side (inside) heats the inner pot 14 via the protrusion 13, making the heat generated by the sheathed heater 12 effective. This will be communicated to each part.

そして前記突出部１３は内鍋１４の外側壁に多重に付着
した水分が熱盤１０に落下した時に熱盤１０の内側へ入
り込むのを防止する。The protruding portion 13 prevents moisture attached to the outer wall of the inner pot 14 from entering the inside of the heating plate 10 when it falls onto the heating plate 10.

尚、本考案は熱盤にシーズヒーターを埋設したが必らず
しもシーズヒーターに限定されず例えばノング状のマイ
カヒーター等をアルミニウム板で覆ってもよい。Although the present invention embeds a sheathed heater in the heating plate, it is not necessarily limited to a sheathed heater, and for example, a non-gang-shaped mica heater or the like may be covered with an aluminum plate.

以上の様に本考案は外鍋に収納自在にされる内鍋と、前
記外鍋の内底部に固定する内部に熱源を有した熱盤とを
有し、前記熱盤の熱源の位置する上面より内側に上方に
突出する突出部を設けると共に熱盤の外周縁を外鍋の内
壁に密接させ、前記内鍋の底面を突出部に載置するもの
であるから、前記熱盤の熱膨張による熱盤の内側の変位
は前記熱盤の突出部によって吸収される形となり内鍋を
常時安定して加熱することができる。As described above, the present invention includes an inner pot that can be freely stored in an outer pot, and a heating plate that is fixed to the inner bottom of the outer pot and has a heat source inside, and the upper surface of the heating plate where the heat source is located. In addition to providing a protruding part that protrudes more inwardly and upwardly, the outer peripheral edge of the heating plate is brought into close contact with the inner wall of the outer pot, and the bottom surface of the inner pot is placed on the protruding part. Displacement inside the heating plate is absorbed by the protrusion of the heating plate, so that the inner pot can be heated stably at all times.

換言すれば熱盤の変位による熱盤と内鍋との接触位置が
従来の様に内鍋の底面中央部に集中するといった欠点は
解消され被調理物を均一に美味しく調理することができ
る。In other words, the disadvantage that the contact position between the heating plate and the inner pot due to the displacement of the heating plate is concentrated at the center of the bottom of the inner pot as in the conventional method is eliminated, and the food to be cooked can be cooked uniformly and deliciously.

この均一な被調理物の調理は前述の様に内鍋の底面のみ
ならず熱盤の外周縁を外鍋に密接せしめて熱盤の熱を外
鍋に伝達し内鍋の側面からも加熱することにより行なう
こともさることながら内鍋と熱盤の載置は熱源の位置す
る上面より内側に設けた突出部により載置されるために
熱源の熱は熱盤の一方向のみへの不均一な伝導にならず
内鍋との接触部の突出部及び外鍋の内壁に内鍋を加熱す
るのに必要な割合で分散され効果的な加熱を行なう。As mentioned above, this uniform cooking of the food is achieved by bringing not only the bottom of the inner pot but also the outer edge of the heating plate into close contact with the outer pot, transferring the heat from the heating plate to the outer pot, and heating from the sides of the inner pot as well. Furthermore, since the inner pot and heating plate are placed on a protrusion provided inside the top surface where the heat source is located, the heat from the heat source is unevenly distributed in only one direction of the heating plate. Effective heating is carried out by distributing heat to the protruding portion of the contact portion with the inner pot and the inner wall of the outer pot at a rate necessary to heat the inner pot without causing excessive conduction.

又、前記内鍋の底面は上方に湾曲する湾曲部を形成する
と共に内鍋の底面を前記熱盤の突出部に載置した時にお
ける熱盤の上面と湾曲部の上部間の寸法を熱盤の内側の
変位寸法より大きくし設定したものであるから、熱盤の
内側に上方に変位して蓄積される永久歪及び熱盤の加熱
時における上方への変位により該熱盤の内側が内鍋の底
面に接触するのを防止する。The bottom surface of the inner pot forms a curved part that curves upward, and the dimension between the top surface of the heating plate and the top of the curved part when the bottom surface of the inner pot is placed on the protruding part of the heating plate is determined by the heating plate. Since it is set to be larger than the displacement dimension on the inside of the heating plate, the inside of the heating plate becomes the inner pot due to the permanent strain that is accumulated by upward displacement inside the heating plate and the upward displacement when the heating plate is heated. to prevent contact with the bottom of the

又、前記内鍋の湾曲１部は該内鍋を外鍋より取出してテ
ーブル等に載）置した時に、異物等による変形を防止す
ることができると共に前記突出部による熱盤の上面と内
鍋の湾曲部との寸法ｌによる空間は熱盤の上面に米粒等
が付着している場合における逃げ部となり内鍋の変形を
防止することになる等数多くの優れた効果を奏する。Furthermore, the curved portion of the inner pot can prevent deformation due to foreign objects when the inner pot is taken out from the outer pot and placed on a table, etc., and the protruding portion prevents the upper surface of the heating plate and the inner pot from being deformed. The space defined by the dimension 1 with respect to the curved portion serves as a relief when rice grains or the like are attached to the upper surface of the heating plate, and has many excellent effects such as preventing deformation of the inner pot.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は電気炊飯器の断面図、第２図のイ乃至二は第１
図に示す熱盤の熱膨張による変位状態を示す説明図、第
３図は本考案の電気調理器の一実施例である電気炊飯器
の要部断面図、第４図は同じく要部動作説明図である。 ７・・・・・・外鍋、１０・・・・・・熱盤、１２・・
・・・・熱源、１３・・・・・・突出部、１４・・・・
・・内鍋、１５・・・・・・湾曲部。Figure 1 is a cross-sectional view of the electric rice cooker, and Figure 2 A to 2 are the first
An explanatory diagram showing the state of displacement due to thermal expansion of the heating plate shown in the figure, Figure 3 is a sectional view of the main part of an electric rice cooker which is an embodiment of the electric cooker of the present invention, and Figure 4 is an explanation of the operation of the main part. It is a diagram. 7...Outer pot, 10...Heating plate, 12...
... heat source, 13 ... protrusion, 14 ...
...Inner pot, 15...Curved part.

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] （１）有底筒状の外鍋と、該外鍋の内底面に固定した内
部に熱源を有し中央に円孔を有して円環状に形成したア
ルミニウム合金製の熱盤と、前記外鍋に収納自在に設け
た内鍋とからなり、前記熱盤の熱源の位置する上面より
内側に上方に突出する突出部を設けると共に熱源の外側
に位置する熱盤の外周縁を外鍋の内壁に密接せしめ、前
記内鍋の底面を突出部に載置したことを特徴とする電気
調理器。(1) A cylindrical outer pot with a bottom, an aluminum alloy heating plate fixed to the inner bottom surface of the outer pot, which has an internal heat source and is formed into an annular shape with a circular hole in the center; It consists of an inner pot that can be freely stored in the pot, and a protrusion that protrudes upward inward from the upper surface of the heating plate where the heat source is located, and the outer periphery of the heating plate located outside the heat source is connected to the inner wall of the outer pot. An electric cooking device characterized in that the bottom surface of the inner pot is placed on a protruding portion. （２）上記実用新案登録請求の範囲第１項に記載の電気
調理器において、前記内鍋の底面は上方に湾曲する湾曲
部を形成すると共に該内鍋の底面を熱盤の突出部に載置
した時における熱盤の上面と湾曲部の上部間の寸法を前
記熱盤の内側の変位寸法より大きく設定したことを特徴
とする。(2) In the electric cooker according to claim 1 of the above-mentioned utility model registration, the bottom surface of the inner pot forms a curved part that curves upward, and the bottom surface of the inner pot is placed on the protruding part of the heating plate. The heating plate is characterized in that the dimension between the upper surface of the heating plate and the upper part of the curved portion when placed is set to be larger than the displacement dimension inside the heating plate.