JP2018033557A

JP2018033557A - rice cooker

Info

Publication number: JP2018033557A
Application number: JP2016167478A
Authority: JP
Inventors: 明広池田; Akihiro Ikeda
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Appliances Inc
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2018-03-08

Abstract

PROBLEM TO BE SOLVED: To control a heat retention time at low temperature and improve user-friendliness in consideration of a use environment temperature of a rice cooker.SOLUTION: A rice cooker includes an inner pot 2 accommodated in a body 1, a heating part 4 for heating the inner pot 2, a lid 3 for covering the upper part of the body 1 and the inner pot 2, room temperature detection means 20 for detecting the temperature of ambient air, inner pot temperature detection means 18 for detecting the temperature of the inner pot 2, and a control part 9 for controlling the supply of power to the heating part 4 on the basis of the detection information from the room temperature detection means 20 and the inner pot temperature detection means 18. The control part 9 performs heat retention at a target temperature or nearly a target temperature when the temperature detected by the room temperature detection means 20 becomes lower than a predetermined value while performing a heat retaining mode in which heat retention is performed by repeating a low temperature period in which the heat retention temperature for the rice is lower than the target temperature, and a high temperature period in which the heat retention temperature for the rice is higher than the target temperature.SELECTED DRAWING: Figure 3

Description

本発明は、炊飯器に関するものである。 The present invention relates to a rice cooker.

本技術分野の背景技術として、特開２０１０−２００（特許文献１）がある。この公報には、「米飯を収容する内鍋１３と、内鍋１３を加熱して米飯を炊飯する炊飯手段１７と、内鍋１３を加熱して米飯を保温する保温手段１８,１９と、炊飯手段１７と保温手段１８,１９とを制御する制御手段３７とを備え、制御手段３７が、炊飯手段１７による炊飯を実行した後、保温手段１８,１９による米飯の保温温度を高温保温温度から、高温保温温度よりも低温である低温保温温度に切り替える省エネ保温機能を備えた炊飯器１１において、炊飯実行後の省エネ保温機能における高温保温温度から前記低温保温温度への切り替え時間を、あらかじめ任意に設定可能とする。」と記載されている。 As a background art in this technical field, there is JP 2010-200 (Patent Document 1). This gazette includes: “Inner pot 13 for containing cooked rice, rice cooking means 17 for heating the inner pot 13 to cook rice, heat retaining means 18 and 19 for heating the inner pot 13 to keep the cooked rice, The control means 37 which controls the means 17 and the heat retaining means 18 and 19 is provided. After the control means 37 performs the rice cooking by the rice cooking means 17, the heat retaining temperature of the cooked rice by the heat retaining means 18 and 19 is changed from the high temperature heat retaining temperature. In the rice cooker 11 having an energy-saving warming function for switching to a low-temperature warming temperature that is lower than the high-temperature warming temperature, the switching time from the high-temperature warming temperature to the low-temperature warming temperature in the energy-saving warming function after rice cooking is arbitrarily set in advance. It is possible. "

特開２０１０−２００号公報JP 2010-200 A

特許文献１では、低温の保温動作を実行する時間設定を使用者に任せている為に、使用者が設定した時間によっては低温で保温している時間が長くなる事が考えられる。その場合、室温の影響によって保温中の米飯の腐敗菌の発生が考えられる。 In Patent Document 1, since it is left to the user to set the time for executing the low temperature heat retention operation, it can be considered that the time during which the temperature is kept low becomes longer depending on the time set by the user. In this case, the occurrence of spoilage of cooked rice during the heat retention can be considered due to the influence of room temperature.

本発明は、前記の課題を解決するためになされたものであり、本体に収納される内釜と、該内釜を加熱する加熱部と、前記本体及び前記内釜の上部を覆う蓋と、外気の温度を検出する室温検知手段と、前記内釜の温度を検出する内釜温度検知手段と、前記室温検知手段及び前記内釜温度検知手段からの検知情報に基づき、前記加熱部への通電を制御する制御部と、を備え、該制御部は、米飯の保温温度を目標温度よりも低温で保温する低温期間と、前記目標温度よりも高温で保温する高温期間とを繰り返して保温を行う保温モードを実行中に、前記室温検知手段の検知温度が所定値より低下した場合、前記目標温度又は前記目標温度付近の保温を行うことを特徴とする。 The present invention has been made to solve the above-described problems, an inner hook housed in a main body, a heating unit that heats the inner hook, a lid that covers the upper portion of the main body and the inner hook, Based on detection information from the room temperature detecting means for detecting the temperature of the outside air, the inner pot temperature detecting means for detecting the temperature of the inner pot, the room temperature detecting means and the inner pot temperature detecting means, the energization to the heating unit A controller that controls the temperature of the cooked rice, and the controller performs heat insulation by repeatedly performing a low temperature period in which the temperature of the cooked rice is maintained at a temperature lower than the target temperature and a high temperature period in which the temperature is maintained at a temperature higher than the target temperature. When the temperature detected by the room temperature detecting means falls below a predetermined value during execution of the heat retention mode, the temperature is maintained at or near the target temperature.

本発明によれば、炊飯器の使用環境温度を考慮して、低温の保温時間を制御することができ、使い勝手を向上することができる。 ADVANTAGE OF THE INVENTION According to this invention, considering the use environmental temperature of a rice cooker, a low temperature heat retention time can be controlled and usability can be improved.

本発明の実施形態に係る炊飯器の概略縦断面図である。It is a schematic longitudinal cross-sectional view of the rice cooker which concerns on embodiment of this invention. 保温「高」モードの動作例である。It is an operation example of the heat retention “high” mode. 保温「低」モードの動作例である。It is an operation example of the heat retention “low” mode.

以下、実施例について図面を用いて説明する。なお、本発明はこの実施例に限定するものではなく、発明の効果を奏する範囲で、一部の構成の付加、置換、削除が可能である。 Hereinafter, embodiments will be described with reference to the drawings. It should be noted that the present invention is not limited to this embodiment, and some components can be added, replaced, and deleted within the scope of the effects of the invention.

図１は圧力式ジャー炊飯器の概略縦断面図である。図１において、上部に開口が形成されて有底筒状の形をした本体１には、内釜２が着脱自在に収納されている。本体１には、本体１及び内釜２の上部開口を覆う蓋３が開閉自在に取りつけられ、さらに本体１には蓋３の開閉を検出する蓋スイッチ１９が設けられている。 FIG. 1 is a schematic longitudinal sectional view of a pressure jar rice cooker. In FIG. 1, an inner hook 2 is detachably accommodated in a main body 1 having a bottomed cylindrical shape with an opening formed in an upper portion. A lid 3 that covers the upper opening of the main body 1 and the inner hook 2 is attached to the main body 1 so as to be openable and closable. Further, the main body 1 is provided with a lid switch 19 that detects opening and closing of the lid 3.

また、本体１内部には室温検知手段２０が設けられ外気の温度（炊飯器の使用環境温度）を検知する。本体１の底部分には、内釜２を加熱する加熱部４及び内釜温度検知手段１８が設けられ、蓋３内部には内釜２と対向する面に補助加熱部５が設けられており、この補助加熱部５に近接して蓋感温部６が設けられている。 In addition, a room temperature detection means 20 is provided inside the main body 1 to detect the temperature of the outside air (use environment temperature of the rice cooker). A heating part 4 for heating the inner pot 2 and an inner pot temperature detecting means 18 are provided at the bottom of the main body 1, and an auxiliary heating part 5 is provided inside the lid 3 on the surface facing the inner pot 2. A lid temperature sensing unit 6 is provided in the vicinity of the auxiliary heating unit 5.

また、内釜２で発生した蒸気を外部へ逃がすために連通孔１２があり、連通孔１２の途中に調圧孔１３がある。調圧孔１３はソレノイド１５の動作により調圧弁１４が動くことにより開閉する。内釜２の中を加圧する場合は、制御部９からソレノイド１５に指示を出し、調圧弁１４を調圧孔１３のふさぐ位置に固定する。逆に内釜２の内部を外気と同じ気圧にする場合は、制御部９からソレノイド１５に指示を出し、調圧弁１４を移動して調圧孔１３を開放することで内釜２内部は連通孔１２と通じて外気と同じ気圧になる。 Further, there is a communication hole 12 for releasing steam generated in the inner pot 2 to the outside, and a pressure adjusting hole 13 is provided in the middle of the communication hole 12. The pressure adjusting hole 13 is opened and closed when the pressure adjusting valve 14 is moved by the operation of the solenoid 15. When pressurizing the inside of the inner hook 2, an instruction is given from the control unit 9 to the solenoid 15, and the pressure regulating valve 14 is fixed at a position where the pressure regulating hole 13 is blocked. Conversely, when the inside of the inner hook 2 is set to the same atmospheric pressure as the outside air, the controller 9 issues an instruction to the solenoid 15 to move the pressure regulating valve 14 to open the pressure regulating hole 13 so that the inside of the inner hook 2 communicates. It becomes the same atmospheric pressure as the outside air through the hole 12.

使用者が内釜２内に適量の米と水を入れ、操作表示パネル１１上の所定のキーを操作して炊飯コースを選択し、炊飯動作を開始する所定のキーを押下すると、制御部９はブザー音、メロディ音もしくは音声をメッセージ発生手段１６から報知手段１７を介して発生させて炊飯動作を開始する。このとき制御部９は炊飯動作を開始したことを使用者に報知するめたにブザー音、メロディ音、音声をメッセージ発生手段１６から報知手段１７を介して報知後に炊飯動作を開始する。 When the user puts an appropriate amount of rice and water into the inner pot 2, operates a predetermined key on the operation display panel 11 to select a rice cooking course, and presses a predetermined key for starting the rice cooking operation, the control unit 9 Generates a buzzer sound, melody sound or voice from the message generating means 16 via the notifying means 17 and starts the rice cooking operation. At this time, the control unit 9 starts the rice cooking operation after notifying the user of the buzzer sound, the melody sound, and the voice from the message generation unit 16 through the notification unit 17 in order to notify the user that the rice cooking operation has started.

制御部９は内釜温度検知手段１８、蓋感温部６の情報をもとに加熱部４、補助加熱部５を制御することにより、炊飯の加熱動作の各工程を実行する。使用者が開始した炊飯コースの動作が終了すると保温動作に自動で移行する。保温動作に入ると制御部９は室温検知手段２０から得た室温をもとに、約７０℃を中心とした米飯の目標温度を求める。その際、内釜２内と外気の温度差が大きくなることにより内釜２内面に水滴が付着しないように、室温が上下するのと連動して目標温度も約７０℃を中心に上下するように補正制御を行う。 The control unit 9 controls the heating unit 4 and the auxiliary heating unit 5 on the basis of the information in the inner pot temperature detecting means 18 and the lid temperature sensing unit 6, thereby executing each step of the rice cooking heating operation. When the operation of the rice cooking course started by the user is completed, the operation automatically shifts to the heat retaining operation. When the warming operation is started, the control unit 9 obtains the target temperature of the cooked rice centered at about 70 ° C. based on the room temperature obtained from the room temperature detecting means 20. At this time, the target temperature also rises and falls around about 70 ° C. in conjunction with the rise and fall of the room temperature so that water drops do not adhere to the inner surface of the inner pot 2 due to a large temperature difference between the inner pot 2 and the outside air. Correction control is performed.

図２に保温モードの「高」モードの動作の例を示す。
一般的に保温に適している約７０℃の目標温度に米飯の温度を保つように加熱制御する。目標温度の７０℃は固定ではなく、実際には室温検知手段２０から得た室温が上昇すれば目標温度も上昇するように補正し、室温が下降すれば目標温度も下降するように補正する。目標温度の補正範囲は約６０℃（図２の「低い目標温度」）から８０℃（図２の「高い目標温度」）の幅で補正されている。 FIG. 2 shows an example of the operation in the “high” mode of the heat retention mode.
Heat control is performed so that the temperature of the cooked rice is maintained at a target temperature of about 70 ° C., which is generally suitable for heat retention. The target temperature of 70 ° C. is not fixed. Actually, the target temperature is corrected so as to increase when the room temperature obtained from the room temperature detecting means 20 increases, and the target temperature is corrected so as to decrease when the room temperature decreases. The correction range of the target temperature is corrected in the range of about 60 ° C. (“low target temperature” in FIG. 2) to 80 ° C. (“high target temperature” in FIG. 2).

図３に保温モードの「低」モードの動作の例を示す。
目標温度の補正は保温モードの「高」モードと同じで、室温検知手段２０から得た室温が変動すれば目標温度は約６０℃から８０℃の幅で補正される。但し、「低」モードは消費電力量を低減させる目的で目標温度を適温より下げる低温区間と、低温で長時間保温すると腐敗菌の発生があるので一時的に目標温度を適温より上げて腐敗菌の発生を防止するための高温区間を設け、この区間を繰り返して消費電力を低減して保温を行っている。低温期間は室温検知手段２０から得た室温に応じて設定されている。 FIG. 3 shows an example of the operation in the “low” mode of the heat retention mode.
The correction of the target temperature is the same as that in the “high” mode of the heat retention mode. However, the “low” mode has a low temperature section where the target temperature is lowered below the optimum temperature for the purpose of reducing power consumption, and spoilage bacteria are generated when the temperature is kept at a low temperature for a long time. A high temperature section is provided to prevent the occurrence of this, and this section is repeated to reduce power consumption and keep the heat. The low temperature period is set according to the room temperature obtained from the room temperature detecting means 20.

また室温検知手段２０は保温中に常に室温を監視し、室温の変化が検出できない場合は前述した「低」モードを継続し、室温が所定値より低下したことを検知した場合は、制御部９は保温モードを「低」モードから前述した「高」モードへ自動に切り替えて米飯の温度の下がり過ぎを防止して腐敗菌の発生を防止する。保温モードを「高」モードに切り替える際、目標温度を腐敗菌の減菌する高い温度（約８０℃）に設定して米飯を加熱した後に目標温度を約７０℃の高モードに切替えても良い。 The room temperature detecting means 20 always monitors the room temperature during the heat insulation. If the change in the room temperature cannot be detected, the “low” mode is continued, and if it is detected that the room temperature has decreased below the predetermined value, the control unit 9 Automatically switches the heat-retaining mode from the “low” mode to the “high” mode described above to prevent the temperature of the cooked rice from dropping too much to prevent the occurrence of spoilage bacteria. When switching the heat-retaining mode to the “high” mode, the target temperature may be set to a high temperature (about 80 ° C.) at which rot bacteria are sterilized and the cooked rice is heated, and then the target temperature may be switched to the high mode of about 70 ° C. .

すなわち、本実施形態は、本体に収納される内釜と、該内釜を加熱する加熱部と、前記本体及び前記内釜の上部を覆う蓋と、外気の温度を検出する室温検知手段と、前記内釜の温度を検出する内釜温度検知手段と、前記室温検知手段及び前記内釜温度検知手段からの検知情報に基づき、前記加熱部への通電を制御する制御部と、を備え、該制御部は、米飯の保温温度を目標温度よりも低温で保温する低温期間と、前記目標温度よりも高温で保温する高温期間とを繰り返して保温を行う保温モードを実行中に、前記室温検知手段の検知温度が所定値より低下した場合、前記目標温度又は前記目標温度付近の保温を行う。 That is, the present embodiment includes an inner pot accommodated in the main body, a heating unit that heats the inner pot, a lid that covers the main body and the upper portion of the inner pot, and a room temperature detection means that detects the temperature of the outside air, An inner pot temperature detecting means for detecting the temperature of the inner pot, and a control unit for controlling energization to the heating unit based on detection information from the room temperature detecting means and the inner pot temperature detecting means, The control unit is configured to perform the room temperature detection unit while executing a heat retention mode in which the heat retention temperature of the cooked rice is kept at a low temperature period lower than the target temperature and a high temperature period of the heat retention temperature higher than the target temperature. When the detected temperature falls below a predetermined value, the target temperature or the temperature around the target temperature is kept.

これにより、米飯の温度の下がり過ぎを防止して腐敗菌の発生を防止するので、炊飯器の使用環境温度を考慮して、低温の保温時間を制御することができ、使い勝手を向上することができる。 As a result, the temperature of the cooked rice is prevented from dropping too much to prevent the occurrence of spoilage bacteria, so that the low temperature keeping time can be controlled in consideration of the use environment temperature of the rice cooker, and the usability can be improved. it can.

１本体
２内釜
３蓋
４加熱部
９制御部
１７報知手段
１８内釜温度検知手段
２０室温検知手段 DESCRIPTION OF SYMBOLS 1 Main body 2 Inner hook 3 Lid 4 Heating part 9 Control part 17 Notification means 18 Inner pot temperature detection means 20 Room temperature detection means

Claims

本体に収納される内釜と、
該内釜を加熱する加熱部と、
前記本体及び前記内釜の上部を覆う蓋と、
外気の温度を検出する室温検知手段と、
前記内釜の温度を検出する内釜温度検知手段と、
前記室温検知手段及び前記内釜温度検知手段からの検知情報に基づき、前記加熱部への通電を制御する制御部と、を備え、
該制御部は、
米飯の保温温度を目標温度よりも低温で保温する低温期間と、前記目標温度よりも高温で保温する高温期間とを繰り返して保温を行う保温モードを実行中に、前記室温検知手段の検知温度が所定値より低下した場合、前記目標温度又は前記目標温度付近の保温を行うことを特徴とする炊飯器。 An inner pot stored in the main body,
A heating unit for heating the inner pot;
A lid covering the main body and the upper part of the inner pot;
Room temperature detecting means for detecting the temperature of the outside air;
An inner pot temperature detecting means for detecting the temperature of the inner pot;
A control unit for controlling energization to the heating unit based on detection information from the room temperature detection unit and the inner pot temperature detection unit,
The control unit
While executing the heat retention mode in which the temperature of the cooked rice is kept at a low temperature lower than the target temperature and the high temperature period of the high temperature higher than the target temperature, the detection temperature of the room temperature detection means is When the temperature falls below a predetermined value, the rice cooker is characterized by performing heat insulation near the target temperature or the target temperature.