JPS6360651B2

JPS6360651B2 -

Info

Publication number: JPS6360651B2
Application number: JP15315782A
Authority: JP
Priority date: 1982-09-01
Filing date: 1982-09-01
Publication date: 1988-11-25
Also published as: JPS5940817A

Description

【発明の詳細な説明】産業上の利用分野本発明は炊飯機能と保温機能を備えたジヤー炊
飯器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a jar rice cooker equipped with a rice cooking function and a warming function.

従来例の構成とその問題点従来、この種のジヤー炊飯器においては、第１
図に示すように、商用電源１に炊飯ヒータ２と炊
飯スイツチ３の直列回路を接続し、保温ヒータ４
と蓋ヒータ５の並列回路とサイリスタ６の直列接
続回路および、サイリスタ６の制御回路７を炊飯
スイツチ３に接続していた。しかし、この構成で
は、炊飯時には本体の内底部に設けられた炊飯ヒ
ータのみで炊飯を行なうために、鍋の下部に熱が
集中し、米への水分の浸透および、熱の分布が不
均一となり、炊き上がつたご飯にむらが生じ、ふ
つくらと炊き上がらなかつた。Conventional structure and its problems Conventionally, in this type of jar rice cooker, the first
As shown in the figure, a series circuit of a rice cooking heater 2 and a rice cooking switch 3 is connected to a commercial power supply 1, and a series circuit of a rice cooking heater 2 and a rice cooking switch 3 is connected to
A parallel circuit of the lid heater 5, a series connection circuit of the thyristor 6, and a control circuit 7 of the thyristor 6 were connected to the rice cooking switch 3. However, with this configuration, when cooking rice, only the rice heater installed at the inner bottom of the rice cooker is used to cook rice, so heat is concentrated at the bottom of the pot, resulting in uneven penetration of moisture into the rice and uneven heat distribution. , the cooked rice was uneven and did not cook evenly.

発明の目的本発明はこのような従来の欠点を解消し、ご飯
をむらなくふつくらと炊き上げるジヤー炊飯器を
提供するものである。OBJECTS OF THE INVENTION The present invention solves these conventional drawbacks and provides a jar rice cooker that can cook rice evenly and fluffy.

発明の構成本発明は本体と、本体上面に開閉自在に設けた
蓋と、本体内に着脱自在に収容される鍋と、本体
の内底部に設けた下部ヒータと、本体の内側面に
設けた側部ヒータと、蓋下面に設けた蓋ヒータを
備え、炊飯時には、一定周期でオンオフを繰り返
す制御素子と側部ヒータとによる直列回路に下部
ヒータを並列接続し、この並列回路を炊飯スイツ
チを介して電源に接続し、保温時には前記制御素
子と側部ヒータと下部ヒータと蓋ヒータの直列回
路を電源に接続するとともに、鍋温度を感知する
感温素子の感知温度に対応して前記制御素子をオ
ンオフする駆動制御回路を前記制御素子のゲート
極に接続したことにより炊飯時には下部ヒータに
連続通電し、側部ヒータに一定周期で通電して炊
きむらを防止し、保温時には鍋温度に応じて上下
側面から断続的に加熱して、全体を均一温度に保
つものである。Structure of the Invention The present invention comprises a main body, a lid provided on the top surface of the main body so as to be openable and closable, a pot removably housed in the main body, a lower heater provided on the inner bottom of the main body, and a lid provided on the inner surface of the main body. It is equipped with a side heater and a lid heater installed on the underside of the lid. During rice cooking, the lower heater is connected in parallel to a series circuit consisting of a control element that repeats on/off at a constant cycle and the side heater, and this parallel circuit is connected via a rice cooking switch. When keeping warm, the series circuit of the control element, the side heater, the lower heater, and the lid heater is connected to the power supply, and the control element is connected to the power supply in response to the temperature sensed by the thermosensor that detects the temperature of the pan. By connecting a drive control circuit that turns on and off to the gate electrode of the control element, the lower heater is continuously energized during rice cooking, the side heater is energized at regular intervals to prevent uneven cooking, and when keeping rice warm, it can be turned up and down depending on the pot temperature. It heats intermittently from the sides to maintain a uniform temperature throughout.

実施例の説明以下、添付図面に基づいて本発明の一実施例に
ついて説明する。第２図において、本体８に蓋９
を開閉自在に取付け、この本体８内に鍋１０を着
脱自在に収容しうるよう構成されている。そして
この本体８の内底部に下部ヒータ１１と炊飯スイ
ツチ１２とを設け、本体８の内側面に側部ヒータ
１３と感温センサ１４を取付けるとともに、蓋９
の下面に蓋ヒータ１５を設けている。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 2, a lid 9 is attached to the main body 8.
The main body 8 is attached so as to be openable and closable, and a pot 10 can be detachably housed in the main body 8. A lower heater 11 and a rice cooking switch 12 are provided at the inner bottom of the main body 8, a side heater 13 and a temperature sensor 14 are attached to the inner surface of the main body 8, and a lid 9 is installed.
A lid heater 15 is provided on the lower surface of the lid heater 15.

回路構成について説明すると、炊飯ヒータ１１
とリレーRLの共通端子RLc、常開端子RLaの直
列回路と、側部ヒータ１３とサイリスタ１７の直
列回路が並列接続し、炊飯スイツチ１２の共通端
子１２ｃ、炊飯側端子１２ａを介して商用電源１
６に接続される。一方、蓋ヒータ１５はリレー
RLの常閉端子RLbと炊飯スイツチ１２共通端子
１２ｃに接続されている。Ａは定電圧電源回路
で、ダイオードＤ１、抵抗Ｒ１，Ｒ２、コンデン
サＣ１、定電圧ダイオードZDより構成されてい
る。Ｂは炊飯、保温判別回路でダイオードＤ２，
Ｄ３、抵抗Ｒ３，Ｒ４，Ｒ５、コンデンサＣ２、
トランジスタＱ１、インバータ回路IC１より構
成されている。Ｃはリレー駆動回路で抵抗Ｒ６，
Ｒ７、トランジスタＱ２、リレーRLより構成さ
れている。Ｄは無安定マルチバイブレータで抵抗
Ｒ８，Ｒ９，Ｒ１０、NAND回路IC２、インバ
ータ回路IC３，IC４、ダイオードＤ４，Ｄ５コ
ンデンサＣ３より構成されている。Ｅはサイリス
タ駆動回路で抵抗Ｒ１１，Ｒ１２、トランジスタ
Ｑ３より構成されている。Ｆは温度制御回路で抵
抗Ｒ１３，Ｒ１４，Ｒ１５，Ｒ１６，Ｒ１７、感
温センサ１４、コンパレータIC５、トランジス
タＱ４、より構成されている。 To explain the circuit configuration, the rice cooking heater 11
The series circuit of the common terminal RLc of the relay RL, the normally open terminal RLa, and the series circuit of the side heater 13 and the thyristor 17 are connected in parallel, and the commercial power supply 1 is connected via the common terminal 12c of the rice cooking switch 12 and the rice cooking side terminal 12a.
Connected to 6. On the other hand, the lid heater 15 is a relay
It is connected to the normally closed terminal RLb of RL and the common terminal 12c of the rice cooking switch 12. A is a constant voltage power supply circuit, which is composed of a diode D1, resistors R1 and R2, a capacitor C1, and a constant voltage diode ZD. B is the rice cooking/warming determination circuit, which is a diode D2,
D3, resistors R3, R4, R5, capacitor C2,
It consists of a transistor Q1 and an inverter circuit IC1. C is a relay drive circuit with a resistor R6,
It consists of R7, transistor Q2, and relay RL. D is an astable multivibrator, which is composed of resistors R8, R9, R10, a NAND circuit IC2, inverter circuits IC3, IC4, diodes D4, D5, and a capacitor C3. A thyristor drive circuit E is composed of resistors R11, R12 and a transistor Q3. F is a temperature control circuit which is composed of resistors R13, R14, R15, R16, R17, a temperature sensor 14, a comparator IC5, and a transistor Q4.

上記構成において動作を説明すると、炊飯時に
は炊飯スイツチ１２は接点１２ａと１２ｃが接続
し、接点１２ｂは開放のため、トランジスタＱ１
はOFFで、トランジスタＱ１のコレクタはLOW
となり、インバータ回路IC２の出力はHIGHとな
る。この結果、無安定マルチバイブレータ回路Ｄ
は発振する。一方、コンパレータIC５の非反転
入力はダイオードＤ３により低電位に保たれ、コ
ンパレータIC５の出力はLOWとなり、トランジ
スタＱ４はOFFする。よつてトランジスタＱ３
は、無安定マルチバイブレータ回路Ｄの出力信号
により一定周期でON−OFFを繰り返し、サイリ
スタ１７を制御し、側部ヒータ１３を通電制御す
る。なお、トランジスタＱ１のコレクタがLOW
電位のため、トランジスタＱ２はONし、リレー
RLのコイルは通電し、接点は常開端子RLaと共
通端子RLcが接続し、下部ヒータ１１は通電され
る。保温時は、炊飯スイツチ１２は端子１２ｂと
共通端子１２ｃが接続するため、トランジスタＱ
１はONで、トランジスタＱ１のコレクタは
HIGHとなり、インバータ回路IC２の出力は
LOWとなる。この結果、無安定マルチバイブレ
ータ回路Ｄは発振を停止し、無安定マルチバイブ
レータ回路Ｄの出力（IC４の出力）はHIGHとな
る。一方、ダイオードＤ３は非導通となるため、
コンパレータIC５の出力は、R_TH＞R₁₃×R₁₅／R₁₄のときLOW、R_TH＜R₁₃×R₁₅／R₁₄のときHIGHとなる。 To explain the operation in the above configuration, during rice cooking, the contacts 12a and 12c of the rice cooking switch 12 are connected, and the contact 12b is open, so the transistor Q1
is OFF and the collector of transistor Q1 is LOW
Therefore, the output of the inverter circuit IC2 becomes HIGH. As a result, astable multivibrator circuit D
oscillates. On the other hand, the non-inverting input of the comparator IC5 is kept at a low potential by the diode D3, the output of the comparator IC5 becomes LOW, and the transistor Q4 is turned off. Transistor Q3
repeats ON and OFF at a constant cycle according to the output signal of the astable multivibrator circuit D, controls the thyristor 17, and controls the energization of the side heater 13. Note that the collector of transistor Q1 is LOW.
Due to the potential, transistor Q2 turns on and the relay
The coil of RL is energized, the normally open terminal RLa and the common terminal RLc are connected, and the lower heater 11 is energized. During heat retention, the rice cooking switch 12 connects the terminal 12b and the common terminal 12c, so the transistor Q
1 is ON, and the collector of transistor Q1 is
becomes HIGH, and the output of inverter circuit IC2 becomes HIGH.
It becomes LOW. As a result, the astable multivibrator circuit D stops oscillating, and the output of the astable multivibrator circuit D (output of IC4) becomes HIGH. On the other hand, since diode D3 becomes non-conductive,
The output of the comparator IC5 becomes LOW when R _TH >R ₁₃ ×R ₁₅ /R ₁₄ and HIGH when R _TH <R ₁₃ ×R ₁₅ /R ₁₄ .

但し、感温センサ１４、抵抗Ｒ１３，Ｒ１４，Ｒ
１５の抵抗値をそれぞれR_TH、R₁₃、R₁₄、R₁₅と
する。よつてR_THがR₁₃×R₁₅／R₁₄よりも大きいときは、トランジスタＱ３はON、小さいときはOFF
となり、サイリスタ１７はトランジスタＱ３によ
り制御される。なお、トランジスタＱ１のコレク
タがHIGHのため、トランジスタＱ２はOFFし、
リレーRLのコイルには電流が流れなくなり、リ
レー接点は、常閉端子RLbと共通端子RLcが接続
する。よつて下部ヒータ１１、側部ヒータ１３、
蓋ヒータ１５、サイリスタ１７は直列接続されて
商用電源１６に接続する。この結果、下部ヒータ
１１、側部ヒータ１３、蓋ヒータ１５の直列回路
は、サイリスタ１７により、感温センサ１４の抵
抗値R_THがR₁₃×R₁₅／R₁₄となるように通電制御され、鍋１０内のご飯は一定温度に保たれる。なお、保
温時の下部ヒータ１１と側部ヒータ１３の電力バ
ランスは１対６程度が良好であるが、炊飯時の電
力バランスは、ご飯の出来、側部ヒータ１３の温
度限度の関係上、下部ヒータ１１と側部ヒータ１
３の電力バランスは14対１程度が良い。この条件
を満足するために無安定マルチバイブレータＤの
出力のHIGHとLOWの割合が６対14になるよう
に抵抗Ｒ９，Ｒ１０の抵抗値を設定している。However, the temperature sensor 14, resistors R13, R14, R
Let the resistance values of 15 be R _TH , R ₁₃ , R ₁₄ , and R ₁₅ , respectively. Therefore, when R _TH is larger than R ₁₃ × R ₁₅ /R ₁₄ , transistor Q3 is ON, and when it is smaller, it is OFF.
Therefore, the thyristor 17 is controlled by the transistor Q3. Note that since the collector of transistor Q1 is HIGH, transistor Q2 is turned off.
No current flows through the coil of relay RL, and the normally closed terminal RLb and common terminal RLc are connected to the relay contacts. Therefore, the lower heater 11, the side heater 13,
The lid heater 15 and the thyristor 17 are connected in series and connected to a commercial power source 16. As a result, the series circuit of the lower heater 11, side heater 13, and lid heater 15 is energized by the thyristor 17 so that the resistance value R _TH of the temperature sensor 14 becomes R ₁₃ ×R ₁₅ /R ₁₄ . The rice in the pot 10 is kept at a constant temperature. Note that the power balance between the lower heater 11 and the side heater 13 when keeping warm is about 1:6, but the power balance when cooking rice depends on the quality of the rice and the temperature limit of the side heater 13. Heater 11 and side heater 1
A good power balance for 3 is about 14:1. In order to satisfy this condition, the resistance values of resistors R9 and R10 are set so that the ratio of HIGH to LOW outputs of the astable multivibrator D is 6:14.

発明の効果上記実施例から明らかなように、本発明のジヤ
ー炊飯器は、炊飯時に、本体内底部に設けた下部
ヒータと本体内側面に設けた側部ヒータを同時通
電することにより、鍋上部の米の温度を高め、ふ
つくらとしたむらのないご飯を炊き上げるととも
に、保温時は、下部ヒータ、側部ヒータ、蓋ヒー
タを直列接続して制御素子による通電制御を行な
い、バランスの良い電力分布で保温でき、炊飯性
能の向上をはかることができるものである。Effects of the Invention As is clear from the above embodiments, the jar rice cooker of the present invention can simultaneously energize the lower heater provided at the bottom of the main body and the side heater provided on the side surface of the main body during rice cooking. In addition to raising the temperature of the rice and cooking the rice fluffy and evenly, when keeping the rice warm, the lower heater, side heater, and lid heater are connected in series and the power supply is controlled by a control element to achieve a well-balanced power supply. It can maintain heat evenly and improve rice cooking performance.

[Brief explanation of drawings]

第１図は従来のジヤー炊飯器の回路図、第２図
は本発明の一実施例を示すジヤー炊飯器の断面
図、第３図は同回路図である。８……本体、９……蓋、１０……鍋、１１……
下部ヒータ、１２……炊飯スイツチ、１３……側
部ヒータ、１４……感温センサ、１５……蓋ヒー
タ、１６……商用電源、１７……サイリスタ、Ｄ
……無安定マルチバイブレータ、Ｅ……サイリス
タ駆動回路、Ｆ……温度制御回路。 FIG. 1 is a circuit diagram of a conventional jar rice cooker, FIG. 2 is a sectional view of a jar rice cooker showing an embodiment of the present invention, and FIG. 3 is a circuit diagram thereof. 8... Main body, 9... Lid, 10... Pot, 11...
Lower heater, 12... Rice cooking switch, 13... Side heater, 14... Temperature sensor, 15... Lid heater, 16... Commercial power supply, 17... Thyristor, D
...Astable multivibrator, E...Thyristor drive circuit, F...Temperature control circuit.

Claims

[Claims]

1. A main body, a lid that can be opened and closed on the top of the main body,
It is equipped with a pot that is removably housed in the main body, a lower heater provided on the inner bottom of the main body, a side heater provided on the inner surface of the main body, and a lid heater provided on the lower surface of the lid.
When cooking rice, the lower heater is connected in parallel to a series circuit consisting of a control element and a side heater that are turned on and off at regular intervals, and this parallel circuit is connected to a power source via a rice cooking switch. and a series circuit of the lower heater and the lid heater are connected to a power source, and a drive control circuit is connected to the gate pole of the control element to turn on and off the control element in response to the sensed temperature of the temperature sensing element that senses the pot temperature. rice cooker.