JP2004198007A - Heating cooker - Google Patents

Heating cooker Download PDF

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Publication number
JP2004198007A
JP2004198007A JP2002365561A JP2002365561A JP2004198007A JP 2004198007 A JP2004198007 A JP 2004198007A JP 2002365561 A JP2002365561 A JP 2002365561A JP 2002365561 A JP2002365561 A JP 2002365561A JP 2004198007 A JP2004198007 A JP 2004198007A
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Japan
Prior art keywords
steam
food storage
food
circulation duct
air
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JP2002365561A
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Japanese (ja)
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JP4169591B2 (en
Inventor
Shinichi Ohori
進一 大堀
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Sharp Corp
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Sharp Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker of simple constitution capable of thawing frozen food at high quality, achieving compactness in device size, and simplifying control. <P>SOLUTION: This heating cooker is composed of a food tank 1 to contain food, and a circulation fan 4 and a heater 5 provided in a circulation duct 20. At an upper and a lower parts of the circulation duct 20, an intake port 22 and a blow port 23 for air into/out of the food tank are provided. To an upper part of the circulation duct 20, an outside air supply passage 21 is connected. In the circulation duct 20, a steam supply port 7 is installed. In thawing cooking, outside air is sent from the outside air supply passage 21 into the food tank, while steam generated by a steam generating heater 6 is supplied from the steam supply port 7 into the circulation duct 20. Supplied steam is mixed with outside air sent from the outside air supply passage 21 to be low-temperature steam to be supplied into the food tank. By condensation heat transfer of steam, subject food 2 can be efficiently thawed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、過熱水蒸気を用いて庫内の食品を解凍,調理する加熱調理器に関するものである。
【0002】
【従来の技術】
従来より、冷凍された食品を解凍するには、例えば室温中に放置し或いは送風して空気の顕熱を利用する空気解凍方式や、静止水或いは流水中に浸し解凍する水解凍方式、さらには電子レンジの誘電加熱を利用する方式などが用いられている。加えて、過熱水蒸気を用いて解凍する方式がある。
【0003】
図4は、このような過熱水蒸気を用いた従来の加熱調理器の概略構成を示す縦断面図である。同図において、加熱調理器は、食品を収納する食品庫1と、これの側面に配置された循環ダクト20内に設けられた、循環ファン4,庫内加熱用のヒータ5,及び蒸気発生ヒータ6と、食品庫1内の温度を検知する温度検知手段(不図示)とを主に備えて構成されている。
【0004】
一方、循環ダクト20上方には給水タンク8が設けられており、給水タンク8内の水は下側のフィルタ9を経て、給水ポンプ10により送り出され、流水経路11を通って循環ダクト20内の蒸気発生ヒータ6に供給される。供給された水は、蒸気発生ヒータ6で加熱され、水蒸気となって蒸気供給口7より噴出する。ここで、給水タンク8の内部にはイオン交換樹脂を封入しておいても良く、これにより蒸気発生時のスケールの固着を抑制できる。
【0005】
さて、同図に示すように、食品庫1内に収納された食品である被加熱物2は、庫内底部に設置された網状若しくは皿状の食品棚3に載置されている。蒸気供給口7より噴出した水蒸気は、ヒータ5により更に加熱され、100℃以上の過熱水蒸気となる。この過熱水蒸気は、循環ファン4により循環ダクト20上部の吹き出し口23から食品庫1に送り込まれ、これにより食品棚3上の被加熱物2が加熱される。
【0006】
このとき、当初存在していた食品庫1内の空気は、余分な過熱水蒸気と共に、反対側面上部の排気口12から排出される。なお、食品庫1反対側面下部に設けられた14は、食品庫1内に溜まった水を排出する排水口であり、また循環ダクト20下部の22は、食品庫1内の空気を循環ダクト20内に吸い込む吸い込み口である。なお、図中の矢印は、空気等の流れを示している。これは、以下の説明においても同様である。
【0007】
その他、業務用解凍装置として、低温過熱水蒸気を利用した解凍装置が開示されている(例えば、非特許文献1参照)。これは、冷却機を利用して冷却した低温空気に、混入と同時に凝縮しないように湿度制御された過熱水蒸気を自動制御弁により吹き込み、低温の相対湿度100%の空気を生成し、解凍庫内に循環させて被解凍物を解凍するものである。
【0008】
【非特許文献1】
「解凍」2001年4月号 第76巻 第882号
【0009】
【発明が解決しようとする課題】
しかしながら、上述したような従来の解凍方式のうち、空気解凍方式では、解凍にかなりの時間を要する。また、水解凍方式では高い水温は使えず、水の含浸や食品の色の変化,劣化を生じ易い。また、誘電加熱を利用する方式では、水と氷の電磁波吸収性の違いにより、解凍ムラが生じる。
【0010】
一方、過熱水蒸気を用いて解凍する方式では、高湿度雰囲気中に被解凍物が存在すると、被解凍物の表面に雰囲気中の水蒸気が凝縮し、その体積は約20万分の1となる。そして、高湿度空気が次々に送り込まれることにより、次々に凝縮が生じ、このとき約2500kJ/kgの潜熱を食品に与える。また、この作用は温度の低いところで活発に行われるため、均一な解凍が可能である。
【0011】
ところが、従来の過熱水蒸気を用いた加熱調理器においては、過熱水蒸気の温度,給水量を制御する手段を有しているが、これは供給された水を100℃以上で加熱沸騰させ、高湿度雰囲気を生成するものであり、低温の高湿度雰囲気を生成することはできない。また、100℃未満の加熱により低温の高湿度雰囲気を生成するには、相当の時間を要する。
【0012】
また、低温過熱水蒸気を利用した解凍装置においては、冷却機や湿度制御機が必要であり、装置の大型化,制御の複雑化が避けられない。本発明は、このような問題点に鑑み、簡単な構成で、高品位の解凍を可能とし、しかも装置の小型化,制御の簡便化を図った加熱調理器を提供することを目的とする。
【0013】
【課題を解決するための手段】
上記目的を達成するために、本発明では、外気供給経路からの外気に過熱水蒸気を混合し、食品に到達する前に凝縮させ、食品に到達するときには、相対湿度100%近傍の低温雰囲気にする構成とする。そして、蒸気発生手段が循環ダクトの上流部に蒸気を供給する構成とすることにより、供給された蒸気による結露の大部分が循環ダクトに生じ、食品庫内壁への結露を防止できる。
【0014】
また、蒸気発生手段が循環ダクトの上流部に蒸気を供給し、外気供給経路が循環ダクトの上流部に外気を供給する構成とすることにより、供給された蒸気と外気により主として解凍に使用するところの低温過熱蒸気を均質的かつ効率的に生成でき、また外気の供給量を調節することによって低温過熱蒸気の温度を自在に調節することができる。
【0015】
また、蒸気発生手段が循環ダクトのヒータより上流部に蒸気を供給し、外気供給経路が循環ダクトのヒータより上流部に外気を供給する構成とすることにより、低温過熱蒸気から高温過熱蒸気まで均質的かつ効率的に生成できる。
【0016】
【発明の実施の形態】
以下、本発明の実施の形態について、図面を参照しながら説明する。図1は、本発明の第1の実施形態に係る加熱調理器の概略構成を示す縦断面図である。同図において、本実施形態の加熱調理器は、食品を収納する食品庫1と、これの側面に配置された循環ダクト20内に設けられ、庫内の空気を循環する例えば軸流式の循環ファン4及び庫内の空気を加熱するヒータ5とを主に備えて構成されている。また、循環ダクト20の上下部には、庫内空気の吸い込み口22,吹き出し口23が開けられている。ここで、食品庫1内に収納された食品である被加熱物2は、庫内下部に設置された網状若しくは皿状の食品棚3に載置されている。
【0017】
また、循環ダクト20の上部には外気供給経路21が接続されており、その内部には外気を吸入する冷却ファン16、及び開閉弁17が設置されている。そして、循環ダクト20内の庫内空気循環経路には、蒸気供給口7が設置されている。一方、循環ダクト20の斜め上方には給水タンク8が設けられており、給水タンク8内の水は下方の流水経路11を通って蒸気発生ヒータ6に供給される。供給された水は、蒸気発生ヒータ6で加熱され、水蒸気となって蒸気供給口7より噴出する。
【0018】
さて、加熱調理の際には、外気供給経路21内の開閉弁17が閉じ、蒸気発生ヒータ6で生成された飽和水蒸気或いは過熱水蒸気が、蒸気供給口7より循環ダクト20内に供給される。供給された該水蒸気は、循環ダクト20内のヒータ5によって加熱され、高温過熱水蒸気となって庫内に供給される。具体的には、過熱水蒸気が循環ファン4により循環ダクト20下部の吹き出し口23から食品庫1に送り込まれ、これにより食品棚3上の被加熱物2が加熱される。このとき、高温雰囲気による対流伝熱と過熱水蒸気の凝縮伝熱,放射伝熱によって、食品である被加熱物2が効率よく加熱調理される。
【0019】
ここで、蒸気供給口7は食品庫1内に直接設けても良いが、加熱開始直後は食品庫1が低温であるため、食品庫1内壁面で水蒸気が凝縮するので、加熱効率が低下する。そこで、本実施形態では、循環ダクト20内において、循環ファン4による気流に対し、ヒータ5の上流側に蒸気供給口7を配置している。これにより、加熱開始直後の水蒸気加熱が効率良く行われる。
【0020】
次に、解凍調理の際には、外気供給経路21内の開閉弁17が開き、冷却ファン16によって外気が庫内に送風されるとともに、蒸気発生ヒータ6で生成された飽和水蒸気或いは過熱水蒸気が、蒸気供給口7より循環ダクト20内に供給される。供給された該水蒸気は、外気供給経路21より送風される外気と混合され、低温の飽和水蒸気又は過熱水蒸気となって、上記と同様にして庫内に供給される。そして、主に水蒸気の凝縮伝熱によって、食品である被加熱物2が効率よく加熱され、解凍調理される。
【0021】
ここで、外気供給経路21及び蒸気供給口7は、食品庫1内に直接設けても良いが、この場合、外気と水蒸気の混合が食品庫1内で行われるため、食品庫1内壁面及び食品表面にて水蒸気が凝縮して過剰に結露する。このとき、食品庫1の前面にガラス扉を設けていた場合、ガラス扉への結露により庫内の視認性が劣化する。
【0022】
そこで、本実施形態では、外気供給経路21及び蒸気供給口7を、食品庫1からの循環空気が循環ダクト20へと流れる吸い込み口22近傍に設けている。これにより、水蒸気が凝縮して循環ダクト20内で結露し、相対湿度100%前後の低温水蒸気が食品庫1に送り出される。そのため、食品庫1内での結露が抑制される。また、結露した水は循環ダクト20下部へと流れるが、循環ダクト20の底面は食品庫1に向かって傾斜を設けられており、この傾斜に沿って吹き出し口23から食品庫1内に排水される。
【0023】
また、外気温度は調理器の設置場所,時間,及び季節によって異なるため、温度検知手段(不図示)を食品庫1内或いは後述する排気管12a内に設置し、この温度検知手段の検知信号に基づいて、水蒸気が適切な温度となるように、冷却ファン16の回転数、或いは蒸気供給量を制御する。さらに、冷却ファン16を設けず、外気供給経路21の吐出口21aを循環ファン4の吸引部近傍に設け、開閉弁17を開けた状態で、循環ファン4にて外気の吸気と庫内の循環を併用する構成としても良い。
【0024】
また、加熱調理及び解凍調理の両工程において、庫内に水蒸気を供給した時、余剰空気及び余剰水蒸気は、食品庫1の底面又は側面下部に設けられた排出経路24、及び更に下部に設けられた排水容器19を通り、循環ダクト20と反対側面に設置された排気管12aを経て、排気口12より排気される。ここで、排気管12a内に一定の圧力以上で開口する圧力弁等を設けて、庫内圧力を保つように構成しても良い。
【0025】
また、食品庫1の底面は、排出経路24が最下部となるように傾斜を設けられており、調理中に結露した水蒸気及び食品から出た水分は、食品庫1の底面の傾斜に沿って流れ、排出経路24を通って排水容器19に貯留される。貯留された排水は、排水口18より適時排水可能となっている。さらに、排水容器19を着脱自在とすることにより、定期的に取り外し清掃ができるため、衛生的となる。
【0026】
さらに、排出経路24内には開閉弁15が配置されている。ここでは調理中の全時間或いは所定時間、開閉弁15を閉じた状態とし、その間は新たな蒸気供給を停止して、庫内に存在する水蒸気を循環させる。これにより、蒸気発生のための水分供給量が少なくて済む。調理終了後は開閉弁15を開いて、排水容器19に排水する。また、調理品目により、例えば高湿度雰囲気が必要な調理のときは、調理中に開閉弁15を閉じ、低湿度雰囲気で良い調理のときは、調理中に開閉弁15を開ける等のように、開閉弁15を適時開閉する構成としても良い。
【0027】
ここで、開閉弁15は排気管12a内に設けても良いが、この場合、以前の調理時に生じた排水が排水容器19内に貯留されていると、今回の加熱調理中に排水容器内の古い排水が蒸発して食品庫1内に充満するため、衛生的でない。そのため、開閉弁15は排水容器19の手前(上流側)に配置するのが望ましい。このように、開閉弁15の開閉により食品庫1内の湿度を調整しても良いが、その他の構成として、給水タンク8と蒸気発生ヒータ6の間に、送水量が可変であるポンプ(不図示)を設け、該ポンプの送水量によって食品庫1内の湿度を調整しても良い。
【0028】
ところで、食品の加熱手段に関して、誘電加熱を用いると食品の内部を短時間で加熱できるが、誘電加熱とヒータを組み合わせた場合、蒸気量が多いと加熱初期に食品表面への凝縮量が多くなり、その凝縮水にマイクロ波が集中する。このとき、厚みが大きい食品の場合は、内部の加熱が不足する。そのため、食品の厚みが大きいときは、蒸気量を抑える必要がある。よって、食品の厚みに応じて蒸気量を変化させると良い。
【0029】
図2は、本発明の第2の実施形態に係る加熱調理器の概略構成を示す縦断面図である。また図3は、図2の加熱調理器の庫内側面部の要部を示す図である。本実施形態では、上記第1の実施形態と比較して、主に循環ファン4及びヒータ5の形状を変えている。即ち、循環ファン4は上記の軸流式に対して、ここでは遠心式のものを用いており、その外周部にヒータ5を設置した構成としている。
【0030】
各図において、循環ファン4及びヒータ5は、食品庫1側面の循環ダクト20内に設置されており、食品庫1内の空気等を食品庫1側面中央部に設けた吸い込み口22より吸気し、食品庫1側面周囲(ここでは四隅)に複数個設けた吹き出し口23より排気する。このとき、吸い込み口22より吸引した空気等は、循環ファン4の外周部に設置されたヒータ5により加熱される。
【0031】
ここで、蒸気供給口7及び外気供給経路21は、食品庫1内及び循環ダクト20内のどちらに突出させても良い。その他の構造及び、加熱調理,解凍調理の両工程における動作は、概ね第1の実施形態と同様である。但し、排出経路24については、第1の実施形態では食品庫1の底面に設けられた構成として例示しているが、本実施形態では食品庫1の側面下部に設けられた構成として例示している。
【0032】
なお、特許請求の範囲で言う蒸気発生手段は、実施形態における蒸気発生ヒータに対応している。
【0033】
【発明の効果】
以上説明したように、本発明によれば、簡単な構成で、高品位の解凍を可能とし、しかも装置の小型化,制御の簡便化を図った加熱調理器を提供することができる。
【0034】
具体的には、外気供給経路からの外気に過熱水蒸気を混合し、食品に到達する前に凝縮させ、食品に到達するときには、相対湿度100%近傍の低温雰囲気にする構成とする。そして、蒸気発生手段が循環ダクトの上流部に蒸気を供給する構成とすることにより、供給された蒸気による結露の大部分が循環ダクトに生じ、食品庫内壁への結露を防止できる。
【0035】
また、蒸気発生手段が循環ダクトの上流部に蒸気を供給し、外気供給経路が循環ダクトの上流部に外気を供給する構成とすることにより、供給された蒸気と外気により主として解凍に使用するところの低温過熱蒸気を均質的かつ効率的に生成でき、また外気の供給量を調節することによって低温過熱蒸気の温度を自在に調節することができる。
【0036】
また、蒸気発生手段が循環ダクトのヒータより上流部に蒸気を供給し、外気供給経路が循環ダクトのヒータより上流部に外気を供給する構成とすることにより、低温過熱蒸気から高温過熱蒸気まで均質的かつ効率的に生成できる。
【0037】
また、循環ダクトに吹き出し口を設けることにより、循環ダクト内で凝縮結露した凝縮水が、循環ダクト内に貯まることなく吹き出し口より排水される。また、食品庫に設けた排出経路において、開閉弁の開閉により内部の圧力或いは湿度を調整でき、また排水容器を着脱自在とすることにより、排水容器の清掃が可能となり衛生的である。
【0038】
また、蒸気供給口を循環ファンの吸引部近傍に配することにより、蒸気発生手段にて発生した蒸気が、先ず循環ファンにより吸い込まれる。これにより、食品庫内での蒸気の凝集,結露を抑制できる。
【0039】
また、食品庫内の温度が検知可能な庫内温度検知手段により、その検知信号を基に適切な温度となるように冷却ファンの回転数或いは蒸気供給量を制御して適正な雰囲気条件を形成できる。
【0040】
また、加熱手段としてヒータと誘電加熱を組み合わせることにより、肉厚の厚い被加熱物の加熱時間を短縮できる。
【図面の簡単な説明】
【図1】本発明の第1の実施形態に係る加熱調理器の構成を示す縦断面図。
【図2】本発明の第2の実施形態に係る加熱調理器の構成を示す縦断面図。
【図3】図2の加熱調理器の庫内側面部の要部を示す図。
【図4】過熱水蒸気を用いた従来の加熱調理器の構成を示す縦断面図。
【符号の説明】
1 食品庫
2 被加熱物
3 食品棚
4 循環ファン
5 ヒータ
6 蒸気発生ヒータ
7 蒸気供給口
8 給水タンク
9 フィルタ
10 給水ポンプ
11 流水経路
12 排気口
12a 排気管
14 排水口
15 開閉弁
16 冷却ファン
17 開閉弁
18 排水口
19 排水容器
20 循環ダクト
21 外気供給経路
22 吸い込み口
23 吹き出し口
24 排出経路
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heating cooker for thawing and cooking food in a refrigerator using superheated steam.
[0002]
[Prior art]
Conventionally, frozen foods can be thawed by, for example, leaving them at room temperature or blowing air to use the sensible heat of air, or thawing them in still water or running water to defrost them. A system utilizing dielectric heating of a microwave oven is used. In addition, there is a method of thawing using superheated steam.
[0003]
FIG. 4 is a longitudinal sectional view showing a schematic configuration of a conventional heating cooker using such superheated steam. In FIG. 1, a cooking device includes a food storage 1 for storing food and a circulation fan 4, a heater 5 for heating the storage, and a steam generating heater provided in a circulation duct 20 arranged on the side of the food storage. 6 and a temperature detecting means (not shown) for detecting the temperature in the food storage 1.
[0004]
On the other hand, a water supply tank 8 is provided above the circulation duct 20, and the water in the water supply tank 8 is sent out by a water supply pump 10 through a lower filter 9, passes through a flowing water path 11, and is provided in the circulation duct 20. It is supplied to the steam generation heater 6. The supplied water is heated by the steam generation heater 6, becomes steam, and is ejected from the steam supply port 7. Here, an ion-exchange resin may be sealed inside the water supply tank 8, so that sticking of the scale when steam is generated can be suppressed.
[0005]
As shown in FIG. 1, a heated object 2 which is food stored in a food storage 1 is placed on a net-shaped or dish-shaped food shelf 3 installed at the bottom of the storage. The steam spouted from the steam supply port 7 is further heated by the heater 5 and becomes superheated steam of 100 ° C. or more. The superheated steam is sent from the outlet 23 above the circulation duct 20 to the food storage 1 by the circulation fan 4, thereby heating the object 2 on the food shelf 3.
[0006]
At this time, the air in the food storage 1 that was present at the beginning is discharged from the exhaust port 12 on the upper side of the opposite side along with excess superheated steam. In addition, 14 provided at the lower part on the opposite side of the food storage 1 is a drain port for discharging water collected in the food storage 1, and 22 at the lower part of the circulation duct 20 is used to supply air in the food storage 1 to the circulation duct 20. It is a suction port that sucks in. The arrows in the figure indicate the flow of air and the like. This is the same in the following description.
[0007]
In addition, as a commercial thawing apparatus, a thawing apparatus using low-temperature superheated steam is disclosed (for example, see Non-Patent Document 1). In this method, superheated steam whose humidity is controlled so that it does not condense at the same time as being mixed is blown into low-temperature air cooled using a cooler by an automatic control valve to generate low-temperature air with a relative humidity of 100%. To thaw the material to be thawed.
[0008]
[Non-patent document 1]
"Thawing" April 2001, Vol. 76, No. 882
[Problems to be solved by the invention]
However, among the conventional thawing methods described above, the air thawing method requires a considerable time for thawing. Further, in the water thawing method, a high water temperature cannot be used, so that water impregnation and a change in color and deterioration of food are likely to occur. Moreover, in the method using dielectric heating, uneven thawing occurs due to the difference in electromagnetic wave absorption between water and ice.
[0010]
On the other hand, in the method of thawing using superheated steam, when an object to be thawed is present in a high humidity atmosphere, the water vapor in the atmosphere is condensed on the surface of the object to be thawed, and its volume becomes about 200,000. Then, the high-humidity air is sent one after another, whereby condensation occurs one after another, and at this time, latent heat of about 2500 kJ / kg is given to the food. In addition, since this action is actively performed at a low temperature, uniform thawing is possible.
[0011]
However, the conventional heating cooker using superheated steam has a means for controlling the temperature of superheated steam and the amount of water supply. An atmosphere is generated, and a low-temperature and high-humidity atmosphere cannot be generated. In addition, it takes a considerable time to generate a low-temperature, high-humidity atmosphere by heating at less than 100 ° C.
[0012]
In addition, in a thawing apparatus using low-temperature superheated steam, a cooler and a humidity controller are required, so that an increase in the size of the apparatus and complicated control are inevitable. The present invention has been made in view of the above problems, and it is an object of the present invention to provide a heating cooker that enables high-quality thawing with a simple configuration, and that further reduces the size of the apparatus and simplifies control.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, superheated steam is mixed with the outside air from the outside air supply path and condensed before reaching the food, and when reaching the food, a low-temperature atmosphere having a relative humidity of about 100% is set. Configuration. In addition, since the steam generating means supplies the steam to the upstream portion of the circulation duct, most of the dew due to the supplied steam is generated in the circulation duct, and the dew on the inner wall of the food storage can be prevented.
[0014]
Further, the steam generating means supplies steam to the upstream part of the circulation duct, and the outside air supply path supplies outside air to the upstream part of the circulation duct, so that the supplied steam and outside air are mainly used for thawing. Low-temperature superheated steam can be generated homogeneously and efficiently, and the temperature of the low-temperature superheated steam can be freely adjusted by adjusting the supply amount of outside air.
[0015]
In addition, the steam generation means supplies steam upstream of the heater of the circulation duct, and the outside air supply path supplies outside air upstream of the heater of the circulation duct. Can be generated efficiently and efficiently.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic configuration of the heating cooker according to the first embodiment of the present invention. In the figure, a cooking device according to the present embodiment is provided in a food storage 1 for storing food and a circulation duct 20 arranged on a side surface of the food storage 1 to circulate air in the storage, for example, an axial circulation type. It is mainly provided with a fan 4 and a heater 5 for heating the air in the refrigerator. The upper and lower parts of the circulation duct 20 are provided with a suction port 22 and a discharge port 23 for the air in the refrigerator. Here, the article to be heated 2, which is food stored in the food storage 1, is placed on a net-shaped or dish-shaped food shelf 3 installed in the lower part of the storage.
[0017]
An outside air supply path 21 is connected to an upper portion of the circulation duct 20, and a cooling fan 16 for sucking outside air and an on-off valve 17 are installed inside the outside air supply path 21. The steam supply port 7 is provided in the air circulation path in the refrigerator in the circulation duct 20. On the other hand, a water supply tank 8 is provided diagonally above the circulation duct 20, and water in the water supply tank 8 is supplied to the steam generation heater 6 through a lower flowing water path 11. The supplied water is heated by the steam generation heater 6, becomes steam, and is ejected from the steam supply port 7.
[0018]
During the heating and cooking, the on-off valve 17 in the outside air supply path 21 is closed, and the saturated steam or the superheated steam generated by the steam generation heater 6 is supplied into the circulation duct 20 from the steam supply port 7. The supplied steam is heated by the heater 5 in the circulation duct 20, and is supplied as high-temperature superheated steam into the storage. Specifically, the superheated steam is sent into the food storage 1 from the outlet 23 at the lower part of the circulation duct 20 by the circulation fan 4, thereby heating the heated object 2 on the food shelf 3. At this time, the food 2 to be heated is efficiently cooked by convective heat transfer in a high-temperature atmosphere, condensation heat transfer of superheated steam, and radiation heat transfer.
[0019]
Here, the steam supply port 7 may be provided directly in the food storage 1, but since the food storage 1 is at a low temperature immediately after the start of heating, water vapor condenses on the inner wall surface of the food storage 1, so that the heating efficiency is reduced. . Therefore, in the present embodiment, the steam supply port 7 is disposed upstream of the heater 5 with respect to the airflow generated by the circulation fan 4 in the circulation duct 20. Thereby, steam heating immediately after the start of heating is performed efficiently.
[0020]
Next, at the time of thawing cooking, the open / close valve 17 in the outside air supply path 21 is opened, the outside air is blown into the storage by the cooling fan 16, and the saturated steam or the superheated steam generated by the steam generation heater 6 is discharged. Is supplied from the steam supply port 7 into the circulation duct 20. The supplied steam is mixed with the outside air blown from the outside air supply path 21, becomes low-temperature saturated steam or superheated steam, and is supplied into the storage in the same manner as described above. The object to be heated 2, which is a food, is efficiently heated mainly by the condensation heat transfer of steam, and is thawed and cooked.
[0021]
Here, the outside air supply path 21 and the steam supply port 7 may be provided directly in the food storage 1, but in this case, since the mixing of the outside air and the steam is performed in the food storage 1, the inner wall of the food storage 1 and Water vapor condenses on the food surface and causes excessive condensation. At this time, if a glass door is provided on the front surface of the food storage 1, the visibility inside the storage deteriorates due to condensation on the glass door.
[0022]
Therefore, in the present embodiment, the outside air supply path 21 and the steam supply port 7 are provided near the suction port 22 through which the circulating air from the food storage 1 flows to the circulation duct 20. As a result, the water vapor condenses and condenses in the circulation duct 20, and low-temperature water vapor having a relative humidity of about 100% is sent to the food storage 1. Therefore, dew condensation in the food storage 1 is suppressed. The condensed water flows to the lower part of the circulation duct 20, and the bottom surface of the circulation duct 20 is inclined toward the food storage 1, and is drained from the outlet 23 into the food storage 1 along this inclination. You.
[0023]
In addition, since the outside air temperature varies depending on the installation location, time, and season of the cooker, a temperature detecting means (not shown) is installed in the food storage 1 or an exhaust pipe 12a to be described later, and a detection signal of the temperature detecting means is provided. Based on this, the number of rotations of the cooling fan 16 or the amount of supplied steam is controlled so that the steam has an appropriate temperature. Further, the cooling fan 16 is not provided, the discharge port 21a of the outside air supply path 21 is provided near the suction portion of the circulation fan 4, and the open / close valve 17 is opened. May be used in combination.
[0024]
Further, in both the heating cooking and the thawing cooking, when steam is supplied into the storage, the excess air and the excess steam are provided at the discharge path 24 provided at the bottom or lower side of the food storage 1, and at the lower part. After passing through the drainage container 19, the air is exhausted from the exhaust port 12 through the exhaust pipe 12 a provided on the side opposite to the circulation duct 20. Here, a pressure valve or the like that opens at a certain pressure or higher in the exhaust pipe 12a may be provided to maintain the internal pressure.
[0025]
In addition, the bottom of the food storage 1 is provided with a slope such that the discharge path 24 is located at the bottom, and water vapor condensed during cooking and water coming out of the food follow the inclination of the bottom of the food storage 1. The water flows through the discharge path 24 and is stored in the drainage container 19. The stored drainage can be drained from the drainage port 18 in a timely manner. Further, by making the drainage container 19 detachable, the drainage container 19 can be periodically removed and cleaned, thereby improving sanitation.
[0026]
Further, an on-off valve 15 is arranged in the discharge path 24. Here, the on-off valve 15 is kept closed for the entire time during cooking or for a predetermined time, during which time the supply of new steam is stopped, and the steam present in the refrigerator is circulated. As a result, a small amount of water is supplied for generating steam. After the cooking is completed, the on-off valve 15 is opened and the water is drained into the drainage container 19. Also, depending on the cooking item, for example, when cooking requiring a high humidity atmosphere, the on-off valve 15 is closed during cooking, and when cooking is good in a low-humidity atmosphere, the on-off valve 15 is opened during cooking, and so on. The opening / closing valve 15 may be configured to be opened and closed as needed.
[0027]
Here, the opening / closing valve 15 may be provided in the exhaust pipe 12a. In this case, if the wastewater generated during the previous cooking is stored in the drainage container 19, the drainage container in the drainage container during the current heating cooking is removed. It is not sanitary because old wastewater evaporates and fills the food storage 1. For this reason, it is desirable that the on-off valve 15 be arranged before (upstream) the drainage container 19. As described above, the humidity in the food storage 1 may be adjusted by opening and closing the on-off valve 15. However, as another configuration, a pump (variable water supply amount) between the water supply tank 8 and the steam generation heater 6 may be used. (Illustration), and the humidity in the food storage 1 may be adjusted by the amount of water supplied by the pump.
[0028]
By the way, regarding the food heating means, when the dielectric heating is used, the inside of the food can be heated in a short time, but when the dielectric heating and the heater are combined, when the amount of steam is large, the amount of condensation on the food surface in the early stage of heating increases. Microwaves concentrate on the condensed water. At this time, in the case of a food having a large thickness, the internal heating is insufficient. Therefore, when the thickness of the food is large, it is necessary to suppress the amount of steam. Therefore, the amount of steam is preferably changed according to the thickness of the food.
[0029]
Drawing 2 is a longitudinal section showing the schematic structure of the cooking device concerning a 2nd embodiment of the present invention. FIG. 3 is a diagram showing a main part of an inner side surface of the cooking device of FIG. In the present embodiment, the shapes of the circulation fan 4 and the heater 5 are mainly changed as compared with the first embodiment. That is, the circulating fan 4 is of a centrifugal type in contrast to the axial flow type described above, and has a configuration in which a heater 5 is provided on the outer peripheral portion thereof.
[0030]
In each of the drawings, a circulation fan 4 and a heater 5 are installed in a circulation duct 20 on the side of the food storage 1, and suck air such as air in the food storage 1 from a suction port 22 provided in a central portion of the side of the food storage 1. Then, air is exhausted from a plurality of outlets 23 provided around the side surface of the food storage 1 (here, four corners). At this time, the air or the like sucked from the suction port 22 is heated by the heater 5 installed on the outer peripheral portion of the circulation fan 4.
[0031]
Here, the steam supply port 7 and the outside air supply path 21 may project into either the food storage 1 or the circulation duct 20. Other structures and operations in both heating cooking and thawing cooking are substantially the same as those in the first embodiment. However, the discharge path 24 is illustrated as a configuration provided on the bottom surface of the food storage 1 in the first embodiment, but is illustrated as a configuration provided on the lower side of the food storage 1 in the present embodiment. I have.
[0032]
The steam generating means in the claims corresponds to the steam generating heater in the embodiment.
[0033]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a heating cooker that can achieve high-quality thawing with a simple configuration, and that can reduce the size of the apparatus and simplify control.
[0034]
Specifically, superheated steam is mixed with the outside air from the outside air supply path, condensed before reaching the food, and when reaching the food, a low-temperature atmosphere having a relative humidity of about 100% is adopted. In addition, since the steam generating means supplies the steam to the upstream portion of the circulation duct, most of the dew due to the supplied steam is generated in the circulation duct, and the dew on the inner wall of the food storage can be prevented.
[0035]
Further, the steam generating means supplies steam to the upstream part of the circulation duct, and the outside air supply path supplies outside air to the upstream part of the circulation duct, so that the supplied steam and outside air are mainly used for thawing. Low-temperature superheated steam can be generated homogeneously and efficiently, and the temperature of the low-temperature superheated steam can be freely adjusted by adjusting the supply amount of outside air.
[0036]
In addition, the steam generation means supplies steam upstream of the heater of the circulation duct, and the outside air supply path supplies outside air upstream of the heater of the circulation duct. Can be generated efficiently and efficiently.
[0037]
Further, by providing the outlet in the circulation duct, the condensed water condensed and condensed in the circulation duct is drained from the outlet without being stored in the circulation duct. Further, in the discharge path provided in the food storage, the internal pressure or humidity can be adjusted by opening and closing the on-off valve, and the drainage container can be cleaned and sanitary by making the drainage container detachable.
[0038]
Further, by disposing the steam supply port near the suction portion of the circulation fan, the steam generated by the steam generation means is first sucked by the circulation fan. Thereby, aggregation and condensation of steam in the food storage can be suppressed.
[0039]
In addition, by controlling the rotation speed of the cooling fan or the amount of steam supplied so as to obtain an appropriate temperature based on the detection signal, a proper atmosphere condition is formed by a temperature detecting means in the food chamber capable of detecting a temperature in the food storage. it can.
[0040]
Further, by combining a heater and dielectric heating as heating means, the heating time of a thick object to be heated can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a configuration of a heating cooker according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a configuration of a heating cooker according to a second embodiment of the present invention.
FIG. 3 is a view showing a main part of an inner side surface of the cooking device of FIG. 2;
FIG. 4 is a longitudinal sectional view showing the configuration of a conventional cooking device using superheated steam.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Food storage 2 Heated object 3 Food rack 4 Circulation fan 5 Heater 6 Steam generation heater 7 Steam supply port 8 Water supply tank 9 Filter 10 Water supply pump 11 Flowing water path 12 Exhaust port 12a Exhaust pipe 14 Drain port 15 Open / close valve 16 Cooling fan 17 On-off valve 18 Drain port 19 Drain container 20 Circulation duct 21 External air supply path 22 Suction port 23 Blow-off port 24 Drain path

Claims (7)

食品を収納する食品庫と、該食品庫内の空気を循環させる循環ファンと、循環空気に蒸気を供給する蒸気発生手段とを有してなる加熱調理器であって、
前記循環ファンを内蔵し、前記食品庫内の空気を吸い込み前記蒸気発生手段から供給された蒸気を混合して、該食品庫内に送り出す循環ダクトを設けてなる加熱調理器において、
前記蒸気発生手段は、前記循環ダクトの上流部に蒸気を供給することを特徴とする加熱調理器。
A food storage that stores food, a circulation fan that circulates air in the food storage, and a heating cooker that includes a steam generation unit that supplies steam to the circulating air,
In the heating cooker having a circulation duct incorporating the circulation fan, mixing the steam supplied from the steam generating means by sucking air in the food storage, and providing a circulation duct to be sent into the food storage,
The cooking device wherein the steam generating means supplies steam to an upstream portion of the circulation duct.
食品を収納する食品庫と、該食品庫内の空気を循環させる循環ファンと、循環空気に蒸気を供給する蒸気発生手段と、外気を該食品庫内に供給する外気供給経路と、該食品庫内の空気を庫外に排出する排出経路を有してなる加熱調理器であって、
前記循環ファンを内蔵し、前記食品庫内の空気を吸い込み前記蒸気発生手段から供給された蒸気を混合して、該食品庫内に送り出す循環ダクトを設けてなる加熱調理器において、
前記蒸気発生手段は、前記循環ダクトの上流部に蒸気を供給し、前記外気供給経路は、該循環ダクトの上流部に外気を供給することを特徴とする加熱調理器。
A food storage for storing food, a circulation fan for circulating air in the food storage, steam generating means for supplying steam to the circulating air, an outside air supply path for supplying outside air to the food storage, A heating cooker having a discharge path for discharging air inside the refrigerator to the outside,
In the heating cooker having a circulation duct incorporating the circulation fan, mixing the steam supplied from the steam generating means by sucking air in the food storage, and providing a circulation duct to be sent into the food storage,
The heating cooker, wherein the steam generating means supplies steam to an upstream portion of the circulation duct, and the outside air supply path supplies outside air to an upstream portion of the circulation duct.
食品を収納する食品庫と、該食品庫内を加熱するためのヒータと、該ヒータで加熱された空気を該食品庫内に循環させる循環ファンと、循環空気に蒸気を供給する蒸気発生手段と、外気を該食品庫内に供給する外気供給経路と、該食品庫内の空気を庫外に排出する排出経路を有してなる加熱調理器であって、
前記循環ファンと前記ヒータとを内蔵し、前記食品庫内の空気を吸い込み前記蒸気発生手段から供給された蒸気を混合して、該食品庫内に送り出す循環ダクトを設けてなる加熱調理器において、
前記蒸気発生手段は、前記循環ダクトの前記ヒータより上流部に蒸気を供給し、前記外気供給経路は、該循環ダクトの該ヒータより上流部に外気を供給することを特徴とする加熱調理器。
A food storage for storing food, a heater for heating the food storage, a circulation fan for circulating the air heated by the heater into the food storage, and a steam generating means for supplying steam to the circulating air; An outside air supply path for supplying outside air to the food storage, and a heating cooker having a discharge path for discharging air in the food storage outside the storage,
A heating cooker including the circulation fan and the heater, which is provided with a circulation duct that sucks air in the food storage, mixes the steam supplied from the steam generation means, and sends the mixed air into the food storage.
The heating cooker, wherein the steam generating means supplies steam to an upstream portion of the circulation duct from the heater, and the outside air supply path supplies outside air to an upstream portion of the circulation duct from the heater.
前記循環ダクトに前記食品庫と連通して該循環ダクト内の空気或いは水を該食品庫内に排出する吹き出し口を有し、前記食品庫に該食品庫内の空気或いは水を排出する排出経路を備え、該排出経路に開閉可能な弁と着脱可能な排水容器及び排気管とを設けたことを特徴とする請求項1〜請求項3のいずれかに記載の加熱調理器。A discharge path communicating with the food storage to the circulation duct to discharge air or water in the circulation duct into the food storage, and discharging the air or water in the food storage to the food storage; The cooking device according to any one of claims 1 to 3, further comprising: an openable / closable valve, a detachable drainage container, and an exhaust pipe provided in the discharge path. 前記蒸気発生手段で発生した蒸気を前記食品庫内に供給する蒸気供給口を、前記循環ファンの吸引部近傍に設けたことを特徴とする請求項1〜請求項4のいずれかに記載の加熱調理器。The heating according to any one of claims 1 to 4, wherein a steam supply port for supplying steam generated by the steam generating means into the food storage is provided near a suction part of the circulation fan. Cooking device. 前記食品庫内の温度を検知する庫内温度検知手段を有し、該庫内温度検知手段にて検知した庫内温度を適正温度に保つように外気供給量或いは蒸気供給量を制御することを特徴とする請求項1〜請求項5のいずれかに記載の加熱調理器。It has an internal temperature detecting means for detecting the temperature in the food storage, and controls the external air supply amount or the steam supply amount so as to maintain the internal temperature detected by the internal temperature detection means at an appropriate temperature. The cooking device according to any one of claims 1 to 5, wherein 食品の加熱手段としてヒータ単独で或いはヒータと誘電加熱とを組み合わせてなることを特徴とする請求項1〜請求項6のいずれかに記載の加熱調理器。The heating cooker according to any one of claims 1 to 6, wherein the heating means for the food is a single heater or a combination of a heater and dielectric heating.
JP2002365561A 2002-12-17 2002-12-17 Cooker Expired - Fee Related JP4169591B2 (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006046863A (en) * 2004-08-06 2006-02-16 Sharp Corp Superheated steam cooker
JP2006300459A (en) * 2005-04-22 2006-11-02 Hoshizaki Electric Co Ltd Cooker
JP2008014618A (en) * 2006-07-10 2008-01-24 Matsushita Electric Ind Co Ltd Heating cooker with steam generation function
JP2008025861A (en) * 2006-07-18 2008-02-07 Sharp Corp Heating cooker
JP2009008293A (en) * 2007-06-27 2009-01-15 Hitachi Appliances Inc Heating cooker
JP2009127933A (en) * 2007-11-22 2009-06-11 Toshiba Corp Heating cooker
JP2010271017A (en) * 2009-05-25 2010-12-02 Hoshizaki Electric Co Ltd Heating cooker
WO2017104100A1 (en) * 2015-12-16 2017-06-22 パナソニックIpマネジメント株式会社 Water treatment device and heating cooker provided with said water treatment device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006046863A (en) * 2004-08-06 2006-02-16 Sharp Corp Superheated steam cooker
JP4549128B2 (en) * 2004-08-06 2010-09-22 シャープ株式会社 Superheated steam cooker
JP2006300459A (en) * 2005-04-22 2006-11-02 Hoshizaki Electric Co Ltd Cooker
JP4630116B2 (en) * 2005-04-22 2011-02-09 ホシザキ電機株式会社 Cooker
JP2008014618A (en) * 2006-07-10 2008-01-24 Matsushita Electric Ind Co Ltd Heating cooker with steam generation function
JP2008025861A (en) * 2006-07-18 2008-02-07 Sharp Corp Heating cooker
JP4680141B2 (en) * 2006-07-18 2011-05-11 シャープ株式会社 Cooker
JP2009008293A (en) * 2007-06-27 2009-01-15 Hitachi Appliances Inc Heating cooker
JP2009127933A (en) * 2007-11-22 2009-06-11 Toshiba Corp Heating cooker
JP2010271017A (en) * 2009-05-25 2010-12-02 Hoshizaki Electric Co Ltd Heating cooker
WO2017104100A1 (en) * 2015-12-16 2017-06-22 パナソニックIpマネジメント株式会社 Water treatment device and heating cooker provided with said water treatment device

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