JPS5845622Y2 - electric rice cooker - Google Patents
electric rice cookerInfo
- Publication number
- JPS5845622Y2 JPS5845622Y2 JP9954477U JP9954477U JPS5845622Y2 JP S5845622 Y2 JPS5845622 Y2 JP S5845622Y2 JP 9954477 U JP9954477 U JP 9954477U JP 9954477 U JP9954477 U JP 9954477U JP S5845622 Y2 JPS5845622 Y2 JP S5845622Y2
- Authority
- JP
- Japan
- Prior art keywords
- rice
- cooking
- temperature
- rice cooking
- rice cooker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Cookers (AREA)
- Thermistors And Varistors (AREA)
- Thermally Actuated Switches (AREA)
- Control Of Temperature (AREA)
- Control Of Resistance Heating (AREA)
Description
【考案の詳細な説明】
本考案は炊飯用ヒータに直列に接続した負特性サーミス
タ（以下ＮＴＣという）、正特性サーミスタ（以下ＰＴ
Ｃという）夫々の温度−抵抗特性を利用して、炊飯過程
におけるヒータ発熱量を各炊飯段階に応じて制御するこ
とによって、美味しい御飯が炊けるようにした新規な電
気炊飯器に関するものである。[Detailed description of the invention] This invention consists of a negative characteristic thermistor (hereinafter referred to as NTC) and a positive characteristic thermistor (hereinafter referred to as PT) connected in series to a rice-cooking heater.
The present invention relates to a new electric rice cooker that makes it possible to cook delicious rice by controlling the amount of heat generated by the heater in the rice cooking process according to each rice cooking stage by using the temperature-resistance characteristics of each rice cooker (referred to as C).
以下本考案をその実施例を示す図面に基いて説明する。The present invention will be explained below based on the drawings showing the embodiments thereof.
１は炊飯用ヒータ、２はＮＴＣ１３はＰＴＣ１４は熱動
して切替るサーマルリレー、５は保温用ヒータ、６は平
常閉成しているが一定温度に達すると開放するサーマル
リードスイッチであって、これらは何れも炊飯器の外釜
７外面の第１図の図示する位置にこれと伝熱的に取付け
られている。1 is a heater for cooking rice, 2 is an NTC 13 and a PTC 14 are thermal relays that switch thermally, 5 is a heater for keeping warm, and 6 is a thermal reed switch that is normally closed but opens when a certain temperature is reached. All of these are attached to the outer surface of the outer pot 7 of the rice cooker at the positions shown in FIG. 1 in a thermally conductive manner.
８は炊飯器の内容器である。8 is the inner container of the rice cooker.
炊飯用ヒータ１に対しＮＴＣ２及びＰＴＣ３を直列に接
続して炊飯回路を形成し、保温用ヒータ５にサーマルリ
ードスイッチ６を直列に接続して保温回路を形成し、前
記炊飯回路と保温回路はサーマルリレー４によって夫々
切替るようにして電源間に接続されている。A rice cooking circuit is formed by connecting an NTC 2 and a PTC 3 in series to the rice cooking heater 1, a thermal reed switch 6 is connected in series to the warming heater 5 to form a heat preservation circuit, and the rice cooking circuit and the heat preservation circuit are connected to each other in series. The power supplies are connected to each other so as to be switched by relays 4, respectively.
前記ＰＴＣ３は正の温度−抵抗特性を有し、第３図の曲
線すに示すように、低温度域において低い抵抗値を示す
が、ある一点の温度（キュリ一点Ｑｐ）に達すると急激
に抵抗値を増加し、以後はぼこの高抵抗値を維持する性
質のものであって、このＰＴＣ３のキュリ一点Ｑｐは御
飯の炊き上げ温度Ｔ１附近に設定されている。The PTC3 has a positive temperature-resistance characteristic, and as shown in the curve in Figure 3, shows a low resistance value in a low temperature range, but when it reaches a certain temperature (one point Qp), the resistance suddenly decreases. It has the property of increasing the resistance value and maintaining the high resistance value thereafter, and the one point Qp of this PTC 3 is set near the rice cooking temperature T1.
他方、ＮＴＣ２はＰＴＣ３とは逆に負の温度−抵抗特性
を有し、第３図の曲線ａに示すように、低温度域におい
ては高い抵抗値を示すが、ある一定の温度（キュリ一点
Ｑ。On the other hand, NTC2 has a negative temperature-resistance characteristic opposite to PTC3, and as shown in curve a in Figure 3, it shows a high resistance value in the low temperature range, but at a certain temperature (Curie point Q .
）に達すると急激に抵抗値を減じ、以後はぼこの抵抗値
を維持する性質のものであって、このＮＴＣ２のキュリ
一点Ｑ。), the resistance value decreases rapidly and thereafter maintains the same resistance value.
は前記ＰＴＣ３のキュリ一点Ｑ、よりも低い炊飯中期の
温度に設定されている。is set at a temperature in the middle stage of rice cooking, which is lower than the temperature at the cucumber point Q of PTC3.
従って前記ＰＴＣ３とＮＴＣ２との合成温度−抵抗特性
は、第３図の曲線ａに示すように、炊飯初期の低温度域
及び炊飯後期の高温度域においては高抵抗値を示し、炊
飯中期の中温度域においては抵抗値を示す。Therefore, the composite temperature-resistance characteristic of PTC3 and NTC2 shows a high resistance value in the low temperature range in the early stage of rice cooking and the high temperature range in the late stage of rice cooking, as shown by curve a in Figure 3, and shows a high resistance value in the middle stage of rice cooking. It shows the resistance value in the temperature range.
次に、前記回路の動作を説明する。Next, the operation of the circuit will be explained.
まず、サーマルリレー４を手動で切換端子Ａ側に接続（
実線の位置）して炊飯回路に通電する。First, manually connect thermal relay 4 to switching terminal A side (
(solid line position) and energize the rice cooking circuit.
炊飯開始時はＮＴＣ２の抵抗値が大きいため（ＮＴＣ２
とＰＴＣ３の合成抵抗が大きいため）、該回路には小さ
い電流しか流れず炊飯用ヒータ１の発熱量は小さいがら
、炊飯初期における釜内温度は、第４図に示すように除
々にしか上昇しない。When starting rice cooking, the resistance value of NTC2 is large (NTC2
(Because the combined resistance of PTC3 and .
釜内温度の緩慢な上昇に対応して外釜７と伝熱的に接触
しているＮＴＣ２及びＰＴＣ３も温度上昇するが、これ
らの雰囲気温度がキュリ一点ＱｎとＱ、＆の間の温度範
囲となる炊飯中期にはＮＴＣ２とＰＴＣ３の合成抵抗値
が最低になるため、炊飯回路には大きな電流が流れ炊飯
用ヒータ１の発熱量は大きくなるので、釜内温度は第４
図に示すように急速に上昇し、御飯を勢いよく炊き上げ
る。Corresponding to the slow rise in the temperature inside the pot, the temperature of NTC2 and PTC3, which are in thermally contact with the outer pot 7, also rises, but if the ambient temperature of these is within the temperature range between Curie point Qn and Q, & During the middle stage of rice cooking, the combined resistance of NTC2 and PTC3 is at its lowest, so a large current flows through the rice cooking circuit, and the amount of heat generated by the rice cooking heater 1 increases.
As shown in the diagram, it rises rapidly and cooks the rice vigorously.
次いで前記雰囲気温度が炊き上げ温度Ｔ１附近に達する
と、この温度範囲内にキュリ一点Ｑｐを有するＰＴＣ３
はその抵抗値を急激に増加する（ＮＴＣ２とＰＴＣ３と
の合成抵抗が再び大きくなるため、釜内温度は第４図に
示すようにきわめてゆるやかに上昇し、炊き上り終了時
の温度Ｔ２になったところでサーマルリレー４が作動し
、切換端子８側に切替るので、炊飯回路が遮断されると
同時に前記保温回路が通電状態になる。Next, when the ambient temperature reaches around the cooking temperature T1, the PTC3 having one point Qp within this temperature range
(The combined resistance of NTC2 and PTC3 increases again, so the temperature inside the pot rises very slowly as shown in Figure 4, reaching the temperature T2 at the end of cooking.) By the way, the thermal relay 4 is activated and switched to the switching terminal 8 side, so that the rice cooking circuit is cut off and at the same time, the heat retention circuit is turned on.
上記のように構成してなる本案電気炊飯器は、前述した
如（ＮＴＣ２及びＰＴＣ３により炊飯用ヒータ１の通電
発熱量の制御を行うことが可能であるため、次のような
効果を奏するものである。The electric rice cooker of the present invention configured as described above has the following effects because it is possible to control the amount of heat generated by energization of the rice cooking heater 1 using the NTC 2 and PTC 3 as described above. be.
（イ）御飯の焦げつきは、炊飯初期と炊飯後期に強く加
熱したときに起こる。(a) Burnt rice occurs when the rice is heated strongly during the early and late stages of cooking.
即ち、炊飯初期のまだ水が温らないうちに強く加熱する
と米粒も対流を起す間がなく内容器８の底にある米粒だ
けが逸早く糊化されて底にこびりつくからであり、炊飯
後期は米粒がコロイド状に固った状態にありもはや対流
しないときに依然として強く加熱するから焦げつくので
ある。In other words, if the water is heated strongly in the early stages of rice cooking, when the water is not yet warm, the rice grains will not have time to cause convection, and only the rice grains at the bottom of the inner container 8 will quickly gelatinize and stick to the bottom. It burns because it still heats up strongly even when it is in a colloidal solid state and no longer undergoes convection.
しかし、本案炊飯器の場合、炊飯初期及び後期を共に小
さい発熱量で加熱するから、御飯が焦げつくおそれは全
くない。However, in the case of the rice cooker of this invention, since the rice is heated with a small amount of heat during both the early and late stages of cooking, there is no risk of the rice burning.
（ロ）また、米粒の澱粉が十分な水分の吸収をし、糊化
が進む段階（炊飯中期）において、夫々のキュリ一点が
前述した関係にあるＮＴＣ２及びＰＴＣ３を選択採用し
、この段階において大きい発熱量で加熱し釜内温度を早
く上昇させることによりアミラーゼ等の酵素の作用の下
に澱粉をテ゛キストリンや還元糖に分解させるために、
美味しい御飯を炊くことができる。(b) In addition, at the stage when the starch of rice grains absorbs sufficient water and gelatinization progresses (mid-cooking stage), each cucumber is selected and adopted from NTC2 and PTC3, which have the above-mentioned relationship. In order to decompose starch into textrin and reducing sugar under the action of enzymes such as amylase by heating with calorific value and quickly raising the temperature inside the pot,
You can cook delicious rice.
（ハ）本案炊飯器は、炊飯後期における炊き上げ温度Ｔ
１から炊き上げ終了時に温度Ｔ２に達するまでの間は、
小さい発熱量で釜内温度をゆっくり上昇させるから、こ
の間に余分の水分が蒸散し、また米粒の中心部にまで吸
収されることによって、ベトつきがなく、また生煮えの
ない食味ある御飯が炊ける。(c) The proposed rice cooker has a cooking temperature of T in the latter half of cooking.
From 1 until the temperature reaches T2 at the end of cooking,
Since the temperature inside the pot is slowly raised with a small amount of heat, excess water evaporates during this time and is absorbed into the center of the rice grain, resulting in delicious rice that is not sticky or undercooked.
以上の説明から明らかなように、本案炊飯器は、古来か
ら理想的な炊飯過程と称されている後先チョロチョロ、
中パッパという火加減調節を、まさしく電気炊飯器に取
入れることができたものである。As is clear from the above explanation, the proposed rice cooker uses the rice cooking process, which has been called the ideal rice cooking process since ancient times.
This is an electric rice cooker that has been able to incorporate the heat adjustment called medium pappa into an electric rice cooker.
なお、上記実施例においては、ＮＴＣ２とＰＴＣ３との
直列回路を炊飯用ヒータ１に接続した場合を示したか゛
、ＮＴＣ２とＰＴＣ３との中間に炊飯用ヒータ１をこれ
ら両者と直列になるように挿入接続することも可能であ
ることは勿論である。In addition, in the above embodiment, the case where the series circuit of NTC2 and PTC3 is connected to the rice cooking heater 1 is shown, but the rice cooking heater 1 is inserted between the NTC2 and PTC3 so as to be in series with both of them. Of course, it is also possible to connect.
また、ＮＴＣ２とＰＴＣ３の夫々が炊飯用ヒータ１に対
して直列接続されておればよいのであるから、上記実施
例とは異なり、ＮＴＣ２とＰＴＣ３との並列回路と炊飯
用ヒータ１とを直列に接続することによって同様の作用
効果を奏させることも理論的に可能である。Further, since it is sufficient that each of the NTC2 and PTC3 is connected in series to the rice-cooking heater 1, unlike the above embodiment, the parallel circuit of the NTC2 and PTC3 and the rice-cooking heater 1 are connected in series. It is also theoretically possible to achieve similar effects by doing so.
第１図は本案電気炊飯器の概略側断面図、第２図は本案
電気炊飯器の電気回路図、第３図は本案に使用するＮＴ
Ｃ及びＰＴＣ夫々の、並びに両者合成の温度−抵抗特性
を示すグラフ、第４図は炊飯時間と釜内温度との関係を
示すグラフである。
１・・・・・・炊飯用ヒータ、２・・・・・・ＮＴＣ１
３・・・・・・ＰＴＣ１４・・・・・・サーマルリレー
、５・・・・・・保温用ヒータ、６・・・・・・サーマ
ルリードスイッチ、７・・・・・・外釜、８・・・・・
・内容器。Figure 1 is a schematic side sectional view of the proposed electric rice cooker, Figure 2 is an electric circuit diagram of the proposed electric rice cooker, and Figure 3 is the NT used in the proposed electric rice cooker.
FIG. 4 is a graph showing the temperature-resistance characteristics of C and PTC, as well as a combination of both, and FIG. 4 is a graph showing the relationship between rice cooking time and pot internal temperature. 1... Heater for rice cooking, 2... NTC1
3...PTC14...Thermal relay, 5...Heater for insulation, 6...Thermal reed switch, 7...Outer pot, 8・・・・・・
・Inner container.
Claims (1)
性サーミスタと、該正特性サーミスタのキュリ一点より
も低い炊飯中期温度にキュリ一点が設定された負特性サ
ーミスタとを、炊飯用ヒータに対して直列に接続して炊
飯回路を形成し、該炊飯回路をその総合電気抵抗値が全
炊飯過程中の初期及び後期において高く、中期において
低くなる如く結線したことを特徴とする電気炊飯器。A positive characteristic thermistor with a single point set near the cooking temperature of rice and a negative characteristic thermistor with a single point set at a mid-season temperature of rice cooking, which is lower than the single point of the positive characteristic thermistor, are connected to a rice-cooking heater. An electric rice cooker characterized in that the rice cooking circuits are connected in series to form a rice cooking circuit, and the rice cooking circuits are connected so that the total electric resistance value is high in the early and late stages of the entire rice cooking process and low in the middle stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9954477U JPS5845622Y2 (en) | 1977-07-25 | 1977-07-25 | electric rice cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9954477U JPS5845622Y2 (en) | 1977-07-25 | 1977-07-25 | electric rice cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5426458U JPS5426458U (en) | 1979-02-21 |
| JPS5845622Y2 true JPS5845622Y2 (en) | 1983-10-17 |
Family
ID=29036357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9954477U Expired JPS5845622Y2 (en) | 1977-07-25 | 1977-07-25 | electric rice cooker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5845622Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5774992A (en) * | 1980-10-24 | 1982-05-11 | Matsushita Electric Ind Co Ltd | Underwater heater |
| JPS6132615U (en) * | 1984-07-31 | 1986-02-27 | いすゞ自動車株式会社 | Vibration isolation structure of rotation transmission cable |
-
1977
- 1977-07-25 JP JP9954477U patent/JPS5845622Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5426458U (en) | 1979-02-21 |
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