JP2015081742A - Refrigerator - Google Patents

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JP2015081742A
JP2015081742A JP2013220758A JP2013220758A JP2015081742A JP 2015081742 A JP2015081742 A JP 2015081742A JP 2013220758 A JP2013220758 A JP 2013220758A JP 2013220758 A JP2013220758 A JP 2013220758A JP 2015081742 A JP2015081742 A JP 2015081742A
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temperature
food
supercooling
storage chamber
control means
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JP5920310B2 (en
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松本 真理子
Mariko Matsumoto
真理子 松本
毅 内田
Takeshi Uchida
毅 内田
舞子 柴田
Maiko Shibata
舞子 柴田
誠 岡部
Makoto Okabe
誠 岡部
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of suppressing food degradation, compared to a conventional one, by setting an inner temperature for melting ice crystal in a food after releasing supercooling, according to a freezing point of a stored food.SOLUTION: A refrigerator includes: a storage chamber 8b for preserving food; temperature control means for controlling a temperature in the storage chamber to a target temperature; food temperature detection means 14 for detecting a temperature of food in the storage chamber; and supercooling control means 6 for setting a target temperature to an ice crystal melting inner temperature, according to a temperature after temperature-rise, when temperature-rise of the food detected with the food temperature detection means 14 in a fixed time becomes larger than a supercooling release determination reference in a supercooling state of the food.

Description

この発明は、食品を過冷却状態で保存する冷蔵庫に関する。   The present invention relates to a refrigerator that stores food in a supercooled state.

従来の食品を過冷却状態で保存する冷蔵庫においては、食品の温度を検出するための温度センサーを備え、この温度センサーで検出した食品の温度変化から過冷却解除を検知すると、食品内には氷結晶が生成されているので、この氷結晶を融解するために庫内温度を一定温度まで上昇し、食品の温度が一定温度以上になると、再度、食品を過冷却状態にするための冷却動作を行っている。(例えば、特許文献1参照)。   Conventional refrigerators that store food in a supercooled state are equipped with a temperature sensor for detecting the temperature of the food, and when the release of supercooling is detected from the temperature change of the food detected by this temperature sensor, the food contains ice. Since crystals are formed, the internal temperature is raised to a certain temperature in order to melt the ice crystals, and when the food temperature exceeds a certain temperature, the cooling operation is performed again to bring the food into a supercooled state. Is going. (For example, refer to Patent Document 1).

特開2007−271152号公報JP 2007-271152 A

従来の冷蔵庫では、過冷却解除後の食品内の氷結晶を融解するための庫内温度の設定が食品によらず一定であるため、食品によらず凍結点が常に一定であれば問題ないが、食品によって凍結点が異なる場合には、不要に庫内温度を上げ過ぎて食品の品質劣化を加速することがあるという問題点があった。   In conventional refrigerators, the setting of the internal temperature for melting ice crystals in food after the release of supercooling is constant regardless of food, so there is no problem if the freezing point is always constant regardless of food. When the freezing point varies depending on the food, there is a problem that the temperature inside the cabinet is unnecessarily raised to accelerate the quality deterioration of the food.

この発明は、上述のような課題を解決するためになされたもので、過冷却解除後の食品内の氷結晶を融解するための庫内温度の設定を、収納した食品の凍結点に応じて設定することで、従来に比べて食品の品質劣化を抑制することができる冷蔵庫を得るものである。   This invention was made in order to solve the problems as described above, and the setting of the internal temperature for melting the ice crystals in the food after the release of supercooling is set according to the freezing point of the stored food. By setting, the refrigerator which can suppress the quality deterioration of food compared with the past is obtained.

この発明に係る冷蔵庫においては、食品を保存する収納室と、収納室内の温度を目標温度に制御する温度制御手段と、収納室内の食品の温度を検知する食品温度検知手段と、食品の過冷却状態の時に、食品温度検知手段で検知した食品の一定時間内での温度上昇が、過冷却解除判定基準より大きくなると、温度上昇の後の温度に応じた氷結晶融解庫内温度に目標温度を設定する過冷却制御手段とを備えるものである。   In the refrigerator according to the present invention, the storage room for storing the food, the temperature control means for controlling the temperature in the storage room to the target temperature, the food temperature detection means for detecting the temperature of the food in the storage room, and the supercooling of the food When the temperature rise of the food detected by the food temperature detection means in the state is greater than the supercooling release criterion, the target temperature is set to the ice crystal melting chamber temperature corresponding to the temperature after the temperature rise. And a supercooling control means for setting.

この発明は、食品を凍結温度以下になる過冷却状態で保存する冷蔵庫において、食品の過冷却解除を検知した時に判明する食品の凍結温度に応じて、食品内部に発生する氷結晶を溶かすための庫内温度を調節することで、不要な庫内温度の上昇による食品の品質劣化を抑制することができる。   The present invention relates to a refrigerator for storing food in a supercooled state that is equal to or lower than the freezing temperature, in order to dissolve ice crystals generated inside the food according to the freezing temperature of the food that is found when the supercooling release of the food is detected. By adjusting the internal temperature, it is possible to suppress the quality deterioration of the food due to an unnecessary increase in the internal temperature.

この発明の実施の形態1に係る冷蔵庫の断面図である。It is sectional drawing of the refrigerator which concerns on Embodiment 1 of this invention. この発明の実施の形態1に係るチルド室付近の拡大図である。It is an enlarged view of the vicinity of the chilled chamber according to Embodiment 1 of the present invention. この発明の実施の形態1に係る過冷却制御に関係する機能ブロック図である。It is a functional block diagram related to the supercooling control which concerns on Embodiment 1 of this invention. この発明の実施の形態1に係る過冷却制御のフロ−チャ−トである。1 is a flowchart of supercooling control according to Embodiment 1 of the present invention. この発明の実施の形態1に係る過冷却制御のタイミングチャ−トである。3 is a timing chart of supercooling control according to Embodiment 1 of the present invention. この発明の実施の形態1を示す図5のA付近の拡大図である。FIG. 6 is an enlarged view of the vicinity of A in FIG. 5 showing Embodiment 1 of the present invention. この発明の実施の形態2に係る過冷却制御のフロ−チャ−トである。It is a flowchart of the supercooling control which concerns on Embodiment 2 of this invention. この発明の実施の形態2に係る過冷却制御のタイミングチャ−トである。It is a timing chart of the supercooling control which concerns on Embodiment 2 of this invention. この発明の実施の形態3に係る過冷却制御のフロ−チャ−トである。It is a flowchart of the supercooling control which concerns on Embodiment 3 of this invention. この発明の実施の形態3に係る過冷却制御のタイミングチャ−トである。It is a timing chart of the supercooling control which concerns on Embodiment 3 of this invention.

実施の形態1.
以下、この発明の実施の形態1について説明する。
Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below.

まず、冷蔵庫の構成について、図1及び図2を用いて説明する。
図1は、冷蔵庫の断面図であり、図2は、冷蔵庫のチルド室付近の拡大図を示すものである。
First, the structure of a refrigerator is demonstrated using FIG.1 and FIG.2.
FIG. 1 is a cross-sectional view of the refrigerator, and FIG. 2 is an enlarged view of the vicinity of the chilled chamber of the refrigerator.

図1及び図2において、冷蔵庫本体1は、圧縮機2、冷却器3、送風機4、操作パネル5、制御手段6、冷蔵室7、チルド室8、切替室9、冷凍室11、野菜室12を備えている。
操作パネル5は、冷蔵庫本体1の前面の扉に設けられ、冷蔵庫使用者が冷蔵庫の各部屋の温度調整などを指定できる。制御手段6は、冷蔵庫の各部屋の温度や操作パネル5の情報から圧縮機2や送風機4、図示しない風路各所に設けられたダンパなどの動作を制御する。さらに、外部機器との通信、例えば携帯情報端末からの設定温度変更指示や庫内状況確認などの情報を送受信する。
冷蔵室7、切替室9、野菜室12、及び製氷室(図示なし)は、発泡ウレタンなどの断熱部材で仕切られている。チルド室8は冷蔵室7内に、製氷室(図示なし)は切替室9に隣接するように、それぞれ設けられている。また、切替室9は、操作パネル5で複数の設定温度を選択できる。
1 and 2, the refrigerator body 1 includes a compressor 2, a cooler 3, a blower 4, an operation panel 5, a control means 6, a refrigerator room 7, a chilled room 8, a switching room 9, a freezing room 11, and a vegetable room 12. It has.
The operation panel 5 is provided on the front door of the refrigerator main body 1, and the refrigerator user can specify temperature adjustment of each room of the refrigerator. The control means 6 controls the operation of the compressor 2, the blower 4, dampers provided at various portions of the air path (not shown), etc. from the temperature of each room of the refrigerator and information on the operation panel 5. Furthermore, communication with an external device, for example, information such as a set temperature change instruction from the portable information terminal and confirmation of the state of the interior is transmitted and received.
The refrigerator compartment 7, the switching room 9, the vegetable compartment 12, and the ice making room (not shown) are partitioned by a heat insulating member such as urethane foam. The chilled chamber 8 is provided in the refrigerator compartment 7, and the ice making chamber (not shown) is provided adjacent to the switching chamber 9. Further, the switching chamber 9 can select a plurality of set temperatures on the operation panel 5.

チルド室8は、チルド室上段容器8aとチルド室下段容器8bで構成されている。
チルド室上段容器8aは、従来どおり0℃程度での保管で品質を保てるもの、例えばチ−ズやヨ−グルトなどを収納する容器であり、チルド室下段容器8bは、より低温すなわち過冷却状態で肉や魚およびその加工品を収納する容器である。どちらの容器も上部が開口しており、そこから食品を出し入れする。部材はポリスチレンなど、一般的に家庭用冷蔵庫の収納容器として用いられるものであるが、部材を限定するものではなく、チルド室8の側壁内側に配置された図示していないレ−ル上を前後に移動する。
The chilled chamber 8 includes a chilled chamber upper container 8a and a chilled chamber lower container 8b.
The chilled chamber upper container 8a is a container for storing quality, for example, cheese or yogurt, which can be kept at a temperature of about 0 ° C. as usual, and the chilled chamber lower container 8b is at a lower temperature, that is, in a supercooled state. It is a container for storing meat, fish and processed products. Both containers are open at the top, from which food is taken in and out. The member is generally used as a storage container for a household refrigerator, such as polystyrene, but is not limited to the member, and is moved back and forth on a rail (not shown) disposed inside the side wall of the chilled chamber 8. Move to.

庫内温度検知手段13は、例えばサーミスタであって、チルド室下段容器8b内の雰囲気温度を検知する。また、食品温度検知手段14は、例えば単眼の赤外線センサであって、チルド室下段容器8bの背面に斜めに設置され、チルド室下段容器8b全体を見る視野角を有するもので、チルド室下段容器8b内に収納された食品の温度を検知する。なお、今回の実施例では背面に設置する構成としたが、設置位置はチルド室下段容器8b全体を見ることができる位置であれば側面などでもよい。   The internal temperature detection means 13 is a thermistor, for example, and detects the ambient temperature in the chilled chamber lower container 8b. The food temperature detection means 14 is a monocular infrared sensor, for example, which is obliquely installed on the back of the chilled chamber lower container 8b and has a viewing angle for viewing the entire chilled chamber lower container 8b. The temperature of the food stored in 8b is detected. In addition, although it was set as the structure installed in a back surface in the present Example, as long as the installation position is a position which can see the whole chilled room lower container 8b, a side surface etc. may be sufficient.

次に、過冷却制御の動作について図3〜図6を用いて説明する。
図3は、冷蔵庫1の過冷却制御に関係する主要部の制御ブロック図を示すものである。
図3において、冷蔵庫1における各種検出デ−タの収集とそれに基づく動作指令は制御手段6で処理される。食品を過冷却状態で保存する場合、制御手段6は、予めチルド室下段容器8b内の温度を過冷却温度に設定する。次に、冷蔵室扉検知手段101によって検知される冷蔵室扉の開閉情報、庫内温度検知手段13によって検知されるチルド室下段容器8b内の温度上昇、及び食品温度検知手段14によって検知される温度変化についての情報を基に、過冷却導入を開始するタイミングを決定し、チルド室下段容器8b内の温度をコントロ−ルするためのダンパ103と、送風機4を制御して、過冷却導入に適した冷却を行う。
Next, the supercooling control operation will be described with reference to FIGS.
FIG. 3 is a control block diagram of main parts related to the supercooling control of the refrigerator 1.
In FIG. 3, collection of various detection data in the refrigerator 1 and operation commands based thereon are processed by the control means 6. When the food is stored in a supercooled state, the control means 6 sets the temperature in the chilled chamber lower container 8b in advance to the supercooling temperature. Next, the opening / closing information of the refrigerator compartment door detected by the refrigerator compartment door detection means 101, the temperature rise in the chilled chamber lower container 8b detected by the internal temperature detection means 13, and the food temperature detection means 14 are detected. Based on the information about the temperature change, the timing for starting the supercooling introduction is determined, and the damper 103 for controlling the temperature in the chilled chamber lower container 8b and the blower 4 are controlled to introduce the supercooling. Provide adequate cooling.

図4は、冷蔵庫の過冷却制御のフロ−チャ−トであり、図5は、過冷却制御のタイミングチャ−トであり、図6は図5のA付近の拡大図を示すものである。
図5及び図6には、図4のS1〜S10に対応する箇所を最上段に記載している。
また、図5は、ダンパ103の動作、過冷却制御を行うチルド室下段容器8b内の目標温度、庫内温度検知手段13で検知したチルド室下段容器8b内の温度、及び食品温度検知手段14で検知した食品温度についての時間推移を示すものである。
4 is a flowchart of the supercooling control of the refrigerator, FIG. 5 is a timing chart of the supercooling control, and FIG. 6 is an enlarged view of the vicinity of A in FIG.
5 and 6, the portions corresponding to S1 to S10 in FIG.
FIG. 5 shows the operation of the damper 103, the target temperature in the chilled chamber lower container 8b that performs supercooling control, the temperature in the chilled chamber lower container 8b detected by the internal temperature detector 13, and the food temperature detector 14. It shows the time transition of the food temperature detected in.

図4〜図6中に使用している各記号の定義は、以下の通りである。
Tc:チルド室下段容器8b内の温度[℃]、
Tc_set:チルド室下段容器8b内の目標温度[℃]、
T0:食品を過冷却導入前のチルド室下段容器8b内の温度[℃]、
Tsc:過冷却温度[℃]、
V:過冷却導入冷却速度[℃/h]、
m:過冷却解除判定基準[℃/s]、
time_sc:過冷却導入時間[s]、
time1:1ステップ目の時間[s]、
time2:2ステップ目の時間[s]、
dt:食品温度変化を計算するためのタイムステップ[s]、
Th:食品温度[℃]、
Th_1:time1での食品温度[℃]、
Th_2:time2(time1よりdt後)での食品温度[℃]。
The definitions of the symbols used in FIGS. 4 to 6 are as follows.
Tc: temperature in the chilled chamber lower container 8b [° C.]
Tc_set: target temperature [° C.] in the chilled chamber lower container 8b,
T0: Temperature [° C.] in the chilled chamber lower container 8b before introducing the supercooled food,
Tsc: Supercooling temperature [° C.]
V: Supercooling introduction cooling rate [° C./h],
m: Supercooling release criterion [° C / s],
time_sc: supercooling introduction time [s],
time1: time [s] of the first step,
time2: second step time [s],
dt: Time step [s] for calculating food temperature change,
Th: food temperature [° C.]
Th_1: Food temperature at time 1 [° C.]
Th_2: Food temperature [° C.] at time 2 (after dt from time 1).

図4〜図6において、まず、チルド室下段容器8bに食品が入ったことが前述のように検知されて過冷却制御がスタ−トする。チルド室下段容器8b内の目標温度Tc_setは、食品の凍結点以上で冷蔵室温度以下の温度、例えば従来のチルド室相当の温度0℃となる温度T0に引き上げる(S1〜S2)。これは冷蔵庫内に入った食品を凍結点近くまでは急速に冷やし凍結点近傍からは緩やかに冷やすためで、このようにすることで極力短い冷却時間で食品を過冷却状態に導入できる。   4 to 6, first, it is detected as described above that food has entered the lower container 8b of the chilled chamber, and the supercooling control is started. The target temperature Tc_set in the chilled chamber lower container 8b is raised to a temperature T0 that is not lower than the freezing point of the food and not higher than the refrigerator temperature, for example, a temperature T0 corresponding to a conventional chilled chamber (S1 to S2). This is because the food contained in the refrigerator is rapidly cooled to near the freezing point and gradually cooled from the vicinity of the freezing point. In this way, the food can be introduced into the supercooled state in the shortest possible cooling time.

チルド室下段容器8b内の温度TcがT0に達したら、チルド室下段容器8b内の目標温度Tc_setを食品を安定的に過冷却状態に引き込み、維持できる温度Tsc、例えば−5〜−2℃に設定する(S3)。この温度に安定的に引き込み維持するため、T0とTscとの温度差を過冷却導入時間time_scで除した過冷却導入冷却速度Vで食品を冷却するようダンパ103を開閉(場合によっては圧縮機2や送風機4も制御)する。この冷却速度Vは非常に緩やかなものであり、0.5〜2[℃/h]程度である(S4)。   When the temperature Tc in the chilled chamber lower container 8b reaches T0, the target temperature Tc_set in the chilled chamber lower container 8b is brought to a temperature Tsc at which the food can be stably drawn and maintained in a supercooled state, for example, -5 to -2 ° C. Set (S3). In order to stably pull in and maintain this temperature, the damper 103 is opened and closed to cool the food at the supercooling introduction cooling rate V obtained by dividing the temperature difference between T0 and Tsc by the supercooling introduction time time_sc (in some cases, the compressor 2 And the blower 4 are also controlled). The cooling rate V is very slow and is about 0.5 to 2 [° C./h] (S4).

次に、S5以降の過冷却解除の有無検知と、その際に生成する氷結晶の融解促進を行うための制御について説明する。
まず、時間time1での食品温度Thを食品温度検知手段14で測定し、その測定温度をTh_1とする(S5)。次にあらかじめ設定されたステップ幅の時間dt経過後(S6)、時間time2での食品温度Thを食品温度検知手段14で測定し、その測定温度をTh_2とする(S7)。このときの温度と時間の傾きが、あらかじめ過冷却解除したと考えられる傾きである過冷却解除判定基準m以上であれば、氷結晶融解のための制御に移る。この傾きmは、例えば0.05〜0.2[℃/s]の範囲にある値など、実験的に得られた値を設定する(S8)。S5〜S8は、過冷却解除が検知されるまで、繰り返し実行されることになる。
Next, the detection for the presence or absence of the supercooling release after S5 and the control for promoting the melting of ice crystals generated at that time will be described.
First, the food temperature Th at time time1 is measured by the food temperature detection means 14, and the measured temperature is set to Th_1 (S5). Next, after elapse of time dt having a preset step width (S6), the food temperature Th at time time2 is measured by the food temperature detection means 14, and the measured temperature is set to Th_2 (S7). If the gradient of temperature and time at this time is equal to or greater than the supercooling release criterion m, which is a slope that is considered to have been precooled, the control shifts to ice crystal melting. The slope m is set to an experimentally obtained value such as a value in the range of 0.05 to 0.2 [° C./s] (S8). S5 to S8 are repeatedly executed until the supercooling release is detected.

過冷却解除が検知されると、過冷却解除した直後の食品温度Th_2がその食品の凍結点に相当する。この温度に基づいて、チルド室下段容器8b内の目標温度Tc_setを、細胞損傷なき程度まで氷結晶を融解できる温度、例えばTh_2+2[℃]に設定(S9)する。尚、細胞損傷なき程度まで氷結晶を融解できる庫内設定温度を氷結晶融解庫内温度と呼ぶ。
次に、食品内に発生した氷結晶の融解が終わり食品温度が上昇し始める頃、例えば食品温度Thが、氷結晶融解庫内温度より低く、氷結晶の融解を判定する温度Th_2+1[℃]になるまで、チルド室下段容器8bの目標温度Tc_setをTh_2+2[℃]に維持する(S10)。この状態を形成するために、例えばダンパ103を全閉状態を維持することで、チルド室下段容器8b内の温度を上昇させる。過冷却解除後の食品温度ThがTh_2+1[℃]以上になると、再度S1〜S8までの制御で過冷却導入及び過冷却解除の有無確認を継続する。尚、食品温度が凍結温度より高い状態になる時の判定温度を氷結晶融解判定温度と呼ぶ。
When the supercooling release is detected, the food temperature Th_2 immediately after the supercooling release corresponds to the freezing point of the food. Based on this temperature, the target temperature Tc_set in the lower chilled chamber container 8b is set to a temperature at which ice crystals can be melted to the extent that no cell damage occurs, for example, Th_2 + 2 [° C.] (S9). In addition, the set temperature inside the chamber at which ice crystals can be melted to the extent that there is no cell damage is referred to as the ice crystal melting chamber temperature.
Next, when the melting of the ice crystals generated in the food ends and the food temperature starts to rise, for example, the food temperature Th is lower than the temperature inside the ice crystal melting chamber, and the temperature Th_2 + 1 [° C.] for determining the melting of the ice crystals is reached. The target temperature Tc_set of the chilled chamber lower container 8b is maintained at Th_2 + 2 [° C.] until it becomes (S10). In order to form this state, for example, the temperature in the chilled chamber lower container 8b is raised by maintaining the damper 103 in a fully closed state. When the food temperature Th after the supercooling release becomes equal to or higher than Th_2 + 1 [° C.], the supercooling introduction and the supercooling release confirmation are continued by the control from S1 to S8 again. The determination temperature when the food temperature is higher than the freezing temperature is called the ice crystal melting determination temperature.

実施の形態2.
次に、この発明を実施するための実施の形態2について、図7及び図8を用いて説明する。実施の形態1と冷蔵庫本体1の構成は同じものであり、過冷却制御の方法が異なる。
一般的に、食品によっては細胞組織が非常に脆弱で過冷却解除しやすい食品を保存する場合がある。例えば、ひき肉のように細胞組織が破壊され本来細胞内に安定的に保持されている液体が自由に流動し易くなっている食品や、タラやサバなどアシの速い魚で、細胞組織の分解が進み組織全体が不安定になり水分が流動し易くなりやすい食品などである。このような食品を過冷却で保存するための制御方法が本実施の形態となる。
Embodiment 2. FIG.
Next, a second embodiment for carrying out the present invention will be described with reference to FIGS. The structure of Embodiment 1 and the refrigerator main body 1 is the same, and the method of supercooling control differs.
In general, some foods may store foods that are very fragile and easy to release from supercooling. For example, foods that break down cellular tissues such as minced meat and liquids that are inherently stably held in cells can easily flow freely, and fish with fast reeds such as cod and mackerel, can degrade cellular tissues. It is a food or the like that advances and the entire tissue becomes unstable and moisture tends to flow. A control method for storing such food with supercooling is the present embodiment.

この実施の形態は、過冷却解除の回数が過冷却解除上限回数になると、チルド室下段容器8b内を過冷却温度Tscに冷却するまでの冷却速度を、過冷却解除上限回数になるまでの冷却速度より遅くする制御を行うものである。この制御を行うことで、食品を容易に過冷却状態にすることが可能になる。
図7は、過冷却制御のフローチャートであり、図8は、過冷却制御のタイミングチャートを示すものである。
図7及び図8中に使用している記号は、実施の形態1と同じ定義であれば、同一の記号を使用している。実施の形態1から追加された記号の定義は、以下の通りである。
n:過冷却解除回数[回]、
n_max:過冷却解除上限回数[回]、
nt:過冷却導入時間延長係数。
In this embodiment, when the number of times of supercooling release becomes the number of times of supercooling release upper limit, the cooling rate until the inside of the chilled chamber lower stage container 8b is cooled to the supercooling temperature Tsc is reduced until the number of times of supercooling release is reached. The control is performed to make the speed slower than the speed. By performing this control, it becomes possible to easily bring the food into a supercooled state.
FIG. 7 is a flowchart of the supercooling control, and FIG. 8 is a timing chart of the supercooling control.
The symbols used in FIG. 7 and FIG. 8 are the same symbols as long as they have the same definition as in the first embodiment. The definitions of symbols added from the first embodiment are as follows.
n: Number of times of overcooling release [times]
n_max: Upper limit of supercooling release [times],
nt: supercooling introduction time extension factor.

図7及び図8において、S1〜S10、すなわち食品を投入後に過冷却導入し、過冷却解除を検知すると氷結晶を融解するステップまでは、図4〜図6で示したものと同じである。
S11〜S13は、実施の形態1から新たに追加されたものであり、過冷却解除の回数nをカウントする(S11)。そして、この回数nが過冷却解除上限回数n_max以上になったとき(S12)、この食品は現状の過冷却導入冷却速度Vで安定的に過冷却に引き込み維持することは困難であるとし、あらかじめ設定してあった過冷却導入時間tiem_scに過冷却導入時間延長係数ntを乗じて(S13)、より低速で過冷却に導入していくよう制御する。これは、例えば最初の過冷却導入時よりもダンパ103の開閉時の開時間を短く閉時間を長くし、食品が過冷却状態に到達してからは最初の過冷却導入時と同等のダンパ103の開閉時間とすることで実現する。
尚、過冷却導入時間延長係数ntについては、例えば1.3〜2の範囲にある値など、実験的に得られた値を設定する。
7 and 8, S1 to S10, that is, after introducing the food, when the supercooling is introduced and the release of the supercooling is detected, the steps up to the step of melting the ice crystals are the same as those shown in FIGS.
S11 to S13 are newly added from the first embodiment, and count the number n of the supercooling release (S11). And when this number n becomes more than supercooling cancellation | release upper limit number n_max (S12), it is said that it is difficult to draw this food into supercooling stably with the present supercooling introduction cooling rate V, and to maintain beforehand. The supercooling introduction time tiem_sc that has been set is multiplied by the supercooling introduction time extension coefficient nt (S13), and control is performed so that the supercooling is introduced at a lower speed. This is because, for example, the opening time when the damper 103 is opened / closed is shorter and the closing time is longer than when the first supercooling is introduced, and after the food reaches the supercooled state, the damper 103 equivalent to the first supercooling introduction is used. This is realized by setting the opening / closing time of.
The supercooling introduction time extension coefficient nt is set to an experimentally obtained value such as a value in the range of 1.3 to 2, for example.

実施の形態3.
次に、この発明を実施するための実施の形態3について、図9及び図10を用いて説明する。実施の形態1と冷蔵庫1の構成は同じものであり、過冷却制御の方法が異なる。
この実施の形態は、過冷却解除の回数が過冷却解除上限回数になると、チルド室下段容器8b内の目標温度Tc_setと過冷却導入時間time_scを再設定することで、冷却速度を遅くする制御を行うものである。この制御を行うことで、食品を容易に過冷却状態にすることが可能になる。
図9は、過冷却制御のフローチャートであり、図10は、過冷却制御のタイミングチャートを示すものである。
図9及び図10中に使用している記号は、実施の形態1及び2と同じ定義であれば、同一の記号を使用している。実施の形態1及び2から追加された記号の定義は、以下の通りである。
dT:チルド下段容器8b内の温度引き上げ幅[℃]。
Embodiment 3 FIG.
Next, a third embodiment for carrying out the present invention will be described with reference to FIGS. The structure of Embodiment 1 and the refrigerator 1 is the same, and the method of supercooling control differs.
In this embodiment, when the number of times of supercooling release reaches the number of times of supercooling release upper limit, control is performed to slow down the cooling rate by resetting the target temperature Tc_set and the supercooling introduction time time_sc in the chilled chamber lower stage container 8b. Is what you do. By performing this control, it becomes possible to easily bring the food into a supercooled state.
FIG. 9 is a flowchart of the supercooling control, and FIG. 10 is a timing chart of the supercooling control.
The symbols used in FIG. 9 and FIG. 10 are the same symbols as long as they have the same definition as in the first and second embodiments. The definitions of symbols added from the first and second embodiments are as follows.
dT: temperature raising width [° C.] in the chilled lower container 8b.

図9及び図10において、S1〜S12は、図7及び図8で示したものと同じである。
過冷却解除の回数が過冷却解除上限回数になると、過冷却温度Tscと過冷却導入時間time_scをそれぞれ再設定(S14)する。
過冷却温度TscはTsc+dT[℃]とし高温化し、過冷却導入時間tiem_scは過冷却導入時間延長係数ntを乗じた値に設定する。このように設定することで、過冷却解除を検知した時の過冷却導入冷却速度V及び過冷却温度Tscに対して、より低速な冷却速度Vで過冷却導入を行い、かつより高めの過冷却温度Tscで過冷却状態を維持する制御を行うことになる。
尚、チルド下段容器8b内の温度引き上げ幅dTについては、例えば0.1〜0.5の範囲にある値など、実験的に得られた値を設定する。
また、チルド室下段容器8b内の目標温度Tc_setと過冷却導入時間time_scの両方を再設定する制御としているが、目標温度Tc_setのみ再設定する制御でも同様な効果が得られる。
9 and 10, S1 to S12 are the same as those shown in FIGS.
When the number of times of supercooling release reaches the number of times of supercooling release upper limit, the supercooling temperature Tsc and the supercooling introduction time time_sc are reset (S14).
The supercooling temperature Tsc is increased to Tsc + dT [° C.], and the supercooling introduction time tiem_sc is set to a value multiplied by the supercooling introduction time extension coefficient nt. By setting in this way, supercooling is introduced at a lower cooling rate V with respect to the supercooling introduction cooling rate V and the supercooling temperature Tsc when the supercooling release is detected, and higher supercooling is performed. Control to maintain the supercooled state at the temperature Tsc is performed.
In addition, about the temperature raising width | variety dT in the chilled lower container 8b, the value obtained experimentally, such as the value which exists in the range of 0.1-0.5, for example is set.
Further, although control is performed to reset both the target temperature Tc_set and the subcooling introduction time time_sc in the chilled chamber lower container 8b, the same effect can be obtained by control to reset only the target temperature Tc_set.

実施の形態2及び3において、このように過冷却解除が頻発したとき、操作パネル5に表示、または制御手段6によって使用者の携帯情報端末やPCへ過冷却状態に関連する情報を送信し、早めに使用するよう提示するようにしてもよい。   In the second and third embodiments, when the supercooling release frequently occurs in this way, the information displayed on the operation panel 5 or the information related to the supercooled state is transmitted to the user's portable information terminal or PC by the control means 6. You may make it show to use early.

また、食品温度検知手段14を複眼、または単眼であっても駆動機構を設けた赤外線センサなどにすることで、チルド室下段収納容器8b内のどの位置にあるものが過冷却解除し易いかを提示できれば、冷蔵庫使用者は、より容易に早めに使用すべき食品を確認できる。   In addition, by using an infrared sensor or the like provided with a drive mechanism even if the food temperature detection means 14 is a compound eye or a single eye, it is possible to determine which position in the chilled chamber lower storage container 8b is easily overcooled. If it can present, the refrigerator user can confirm the food which should be used earlier easily.

なお、本実施例に示したチルド室8の構成は、チルド室8内に過冷却保存用の収納容器を設けた構成としたが、チルド室8の収納容器のみでチルド室8全体を過冷却保存用として制御してもよい。このとき、チルド室8の設定温度を、従来のチルド室相当の0℃程度と過冷却保存用の−3℃程度と切り替えられるようにしてもよい。この切替は例えばユ−ザ−が操作パネル5を介して設定する。   The configuration of the chilled chamber 8 shown in the present embodiment is a configuration in which a storage container for supercooled storage is provided in the chilled chamber 8, but the entire chilled chamber 8 is supercooled only by the storage container of the chilled chamber 8. It may be controlled for storage. At this time, the set temperature of the chilled chamber 8 may be switched between about 0 ° C. corresponding to a conventional chilled chamber and about −3 ° C. for supercooled storage. This switching is set by the user via the operation panel 5, for example.

1 冷蔵庫本体、2 圧縮機、3 冷却器、4 送風機、5 操作パネル、
6 制御手段、7 冷蔵室、8 チルド室、8a チルド室上段収納容器、
8b チルド室下段収納容器、9 切替室、11 冷凍室、
12 野菜室、13 庫内温度検知手段、14 食品温度検知手段。
1 refrigerator main body, 2 compressor, 3 cooler, 4 blower, 5 operation panel,
6 control means, 7 refrigerator compartment, 8 chilled room, 8a chilled room upper storage container,
8b Chilled room lower storage container, 9 switching room, 11 freezing room,
12 vegetable room, 13 internal temperature detection means, 14 food temperature detection means.

Claims (5)

食品を保存する収納室と、
前記収納室内の温度を目標温度に制御する温度制御手段と、
前記収納室内の前記食品の温度を検知する食品温度検知手段と、
前記食品が過冷却状態の時に、前記食品温度検知手段で検知した前記食品の一定時間内での温度上昇が、過冷却解除判定基準より大きくなると、前記温度上昇の後の温度に応じた氷結晶融解庫内温度に前記目標温度を設定する過冷却制御手段と
を備えることを特徴とする冷蔵庫。
A storage room for storing food,
Temperature control means for controlling the temperature in the storage chamber to a target temperature;
Food temperature detection means for detecting the temperature of the food in the storage chamber;
When the food is in a supercooled state, when the temperature rise of the food within a predetermined time detected by the food temperature detection means is larger than the supercooling release determination criterion, ice crystals corresponding to the temperature after the temperature rise And a supercooling control means for setting the target temperature to a melting chamber temperature.
前記氷結晶融解庫内温度は、前記温度上昇の後の温度より高く、前記温度上昇の後の温度との差が2℃以下に設定されること
を特徴とする請求項1に記載の冷蔵庫。
2. The refrigerator according to claim 1, wherein the temperature in the ice crystal melting chamber is higher than the temperature after the temperature rise, and the difference from the temperature after the temperature rise is set to 2 ° C. or less.
前記過冷却制御手段は、
前記食品が前記収納室に収納され過冷却状態になった時から、前記食品の一定時間内での温度上昇が前記過冷却解除判定基準より大きくなる状態の発生回数が、過冷却解除上限回数になると、前記過冷却解除上限回数を超えるまでより、前記収納室を過冷却温度に冷却するまでの冷却速度を遅くすること
を特徴とする請求項1に記載の冷蔵庫。
The supercooling control means includes
The number of occurrences of the state in which the temperature rise of the food within a certain period of time is larger than the supercooling release determination criterion from when the food is stored in the storage chamber and becomes supercooled is the supercooling release upper limit number of times. If it becomes, the cooling rate until it cools the said storage chamber to a supercooling temperature will be slowed down until it exceeds the said supercooling cancellation | release upper limit frequency | count.
前記過冷却制御手段は、
前記食品が前記収納室に収納され過冷却状態になった時から、前記食品の一定時間内での温度上昇が前記過冷却解除判定基準より大きくなる状態の発生回数が、過冷却解除上限回数になると、前記過冷却解除上限回数を超えるまでより、前記食品を過冷却状態する前記目標温度を高くすること
を特徴とする請求項1に記載の冷蔵庫。
The supercooling control means includes
The number of occurrences of the state in which the temperature rise of the food within a certain period of time is larger than the supercooling release determination criterion from when the food is stored in the storage chamber and becomes supercooled is the supercooling release upper limit number of times. Then, the target temperature at which the food is supercooled is increased until the supercooling cancellation upper limit number is exceeded. The refrigerator according to claim 1.
前記収納室の外側に表示部を備え、
前記表示部に前記食品の冷却状態を表示すること
を特徴とする請求項1から4のいずれか1項に記載の冷蔵庫。
A display unit is provided outside the storage chamber,
The refrigerator according to any one of claims 1 to 4, wherein a cooling state of the food is displayed on the display unit.
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