JP4028344B2

JP4028344B2 - Storage

Info

Publication number: JP4028344B2
Application number: JP2002299428A
Authority: JP
Inventors: 剛史島; 富夫陶山; 俊明原
Original assignee: Hoshizaki Electric Co Ltd
Current assignee: Hoshizaki Electric Co Ltd
Priority date: 2001-10-19
Filing date: 2002-10-11
Publication date: 2007-12-26
Anticipated expiration: 2022-10-11
Also published as: JP2003194445A

Description

【０００１】
【発明の属する技術分野】
本発明は、貯蔵庫に関し、更に詳細には、庫内温度に応じて冷凍装置を構成する圧縮機の運転をＯＮ−ＯＦＦ制御することで庫内を一定温度に保つと共に、前記圧縮機の停止時には庫内ファンを同期して停止させたりまたは間欠運転に移行させる省エネ運転モードを行ない得るよう構成した貯蔵庫に関するものである。
【０００２】
【従来の技術】
庫内に収納した貯蔵物を冷却貯蔵する冷蔵庫(貯蔵庫)に装備される冷凍装置は、図３に示す如く、▲１▼高圧の液化冷媒を膨張させて気化冷媒とする膨張弁１０、▲２▼この液化冷媒が気化する際に奪取する気化熱により冷却作用を営む冷却器１２、▲３▼この冷却器１２で冷却作用を営んだ後の気化冷媒を、凝縮器に向け圧縮状態で送り込む圧縮機１４および▲４▼この圧縮機１４で圧縮された気化冷媒を凝縮させて液化冷媒とする凝縮器１６等が組み込まれている。また冷蔵庫１８の内部に庫内サーモ２０が配設され、該サーモ２０が検出した庫内の温度情報に応じて、前記圧縮機１４の運転制御(ＯＮ−ＯＦＦ制御)が行なわれるよう構成される。なお凝縮器１６には空冷ファン２２が併設され、このファン２２の回転により強制空冷がなされるようになっている。更に、冷蔵庫１８の内部に庫内ファン２４が配設され、冷却器１２で冷却された冷気は、該庫内ファン２４を作動することにより庫内を循環させるよう構成してある。
【０００３】
前記冷凍装置では、圧縮機１４および空冷ファン２２を作動(ＯＮ)して冷却運転を開始すると、前記冷蔵庫１８の内部に配設された冷却器１２に循環供給される冷媒と、前記庫内ファン２４により循環される庫内空気とが熱交換されることで、庫内温度は徐々に低下する。庫内温度が低下して、その温度が庫内サーモ２０の下限設定温度(例えば設定温度より２℃低い値)に達すると、圧縮機１４および空冷ファン２２が停止(ＯＦＦ)される。庫内温度は、庫外からの侵入熱等により経時的に上昇し、庫内温度が庫内サーモ２０の上限設定温度(例えば設定温度より２℃高い値)に達すると、圧縮機１４と空冷ファン２２とが作動(ＯＮ)され、再び冷却運転が再開される(図４参照)。以上のサイクルを繰返すことによって、庫内温度は設定温度近傍に維持される。
【０００４】
前記冷蔵庫の通常運転モードでは、前記圧縮機１４の作動・停止状態に関係なく、前記庫内ファン２４を連続運転している(図４参照)。しかるに、庫内ファン２４を連続運転すると消費電力が嵩むため、圧縮機１４の停止時には庫内ファン２４を間欠運転させる省エネ運転モードに切替えることで(図５参照)、該ファン２４の稼働率を下げて省エネを図る制御が行なわれる(例えば、特許文献１)。
【０００５】
【特許文献１】
特開平９−１６６３７７号公報(図３)
【０００６】
【発明が解決しようとする課題】
前記庫内温度を検出する庫内サーモ２０は、庫内を循環して最も温度上昇した冷気の温度を検出するため、前記冷却器１２への庫内空気の吸込側近傍に配設されている。この場合において、前述した省エネ運転モードにおいては、図５に示す如く、圧縮機１４の作動中は庫内ファン２４が作動(ＯＮ)しているため、庫内冷気が循環されて庫内中心温度と庫内サーモ２０の取付部温度(検出温度)とは、略同一になる。しかし、圧縮機１４が停止して庫内ファン２４も停止すると、庫内冷気が循環されなくなり、庫内サーモ２０の取付部温度は、冷えている冷却器１２の影響を受けて圧縮機１４の停止後もＴ₁時間は引続き低下し、その後に上昇する。
【０００７】
これに対し、庫内中心温度は圧縮機１４の停止と同時に上昇していくので、庫内サーモ２０の検出温度が上限設定温度に達したときには、庫内中心温度との間に温度差Ｔが生じてしまう。すなわち、圧縮機１４のＯＮ−ＯＦＦ制御は、庫内サーモ２０の検出温度に基づいて行なっているので、該検出温度が圧縮機１４を作動させる上限設定温度に達したときには、庫内中心温度は上限設定温度よりＴ度だけ高くなることになる。従って、省エネ運転モード時は、通常運転モード時に比べると庫内中心温度の上限温度が高くなり、下限温度との差が大きくなって前記貯蔵物が劣化するおそれがある。すなわち、図４に示す通常運転モードでの庫内の温度幅Ｋ₁と、図５に示す省エネ運転モードでの庫内の温度幅Ｋ₂とを比較すると、Ｋ₁＜Ｋ₂となる。
【０００８】
【発明の目的】
本発明は、従来の技術に係る貯蔵庫に内在している前記欠点に鑑み、これを好適に解決するべく提案されたものであって、省エネ運転モード時における庫内の温度差を小さくして貯蔵物の劣化を抑制し得る貯蔵庫を提供することを目的とする。
【０００９】
【課題を解決するための手段】
前記課題を解決し、所期の目的を達成するため、本発明に係る貯蔵庫は、
圧縮機、凝縮器、冷却器等からなる冷凍装置と、前記冷却器で冷却された冷気を庫内に循環させる庫内ファンと、前記冷却器への庫内空気の吸込側近傍に配設されて庫内温度を検出する温度検出手段とを備え、該温度検出手段が上限設定温度を検出したときに前記圧縮機を作動させると共に下限設定温度を検出したときに圧縮機を停止するよう構成され、前記圧縮機の作動・停止に関係なく前記庫内ファンを連続運転する通常運転モードと、圧縮機の作動時には庫内ファンを連続運転し、圧縮機の停止時に庫内ファンを同期して停止または間欠運転する省エネ運転モードとに切替え可能に設定された貯蔵庫において、
前記上限設定温度は、前記通常運転モードにおける圧縮機が作動する第１の上限設定温度と、前記省エネ運転モードにおける圧縮機が作動し、該省エネ運転モードにおける庫内中心温度と温度検出手段の検出温度との間に生ずる温度差Ｔ度だけ第１の上限設定温度より低い第２の上限設定温度とが設定され、
前記下限設定温度は、前記通常運転モードおよび省エネ運転モードで共通温度に設定され、
前記運転モードを切替えたときには、前記圧縮機が作動する上限設定温度を、選択された運転モードに対応する前記第１または第２の上限設定温度に自動的に切替えて運転することを特徴とする。
【００１０】
【発明の実施の形態】
次に、本発明に係る貯蔵庫につき、好適な実施例を挙げて、添付図面を参照しながら以下説明する。図１は、実施例に係る貯蔵庫としての冷蔵庫に装備される冷凍装置の概略構成を示すものであって、その基本構成は図３に関して述べたところと同一であるので、同一の部材については、同じ符号で指示することとする。
【００１１】
すなわち、圧縮機１４の吐出側から導出した吐出管２６は、凝縮器１６の入口側に接続され、この凝縮器１６から導出した冷媒供給管２８は、膨張弁１０を介して冷蔵庫１８の内部に配設された冷却器１２の入口側に接続されている。また、冷却器１２の出口側から導出した吸入管３０は、前記圧縮機１４の吸入側に接続される。
【００１２】
前記冷却器１２は、庫内に配設されたダクト３２により覆われると共に、該ダクト３２の上側に開設された空気の吹出口３２ａに庫内ファン２４が配置され、冷却器１２で冷却された冷気は、該ファン２４を作動することによって庫内に吹出されるよう構成される。またダクト３２の下側に空気の吸込口３２ｂが開設され、庫内を循環した冷気は該吸込口３２ｂを介して吸込まれて再び冷却器１２で冷却されるようになっている。
【００１３】
前記ダクト３２における吸込口３２ｂの近傍に温度検出手段としての庫内サーモ２０が配設され、該庫内サーモ２０の検出温度(温度情報)がマイコン等の制御装置３４に出力されるよう構成される。そして、庫内サーモ２０からの温度情報により、該制御装置３４は前記圧縮機１４の運転を制御(ＯＮ−ＯＦＦ制御)するよう構成される。すなわち、庫内温度が、庫内サーモ２０に予め設定された上限設定温度Ｃ_1,Ｃ₂に達すると、圧縮機１４を作動(ＯＮ)し、下限設定温度Ｃに達すると停止(ＯＦＦ)するよう制御される。このように圧縮機１４のＯＮ−ＯＦＦ制御を行なうことで、庫内温度を上限設定温度Ｃ_1,Ｃ₂と下限設定温度Ｃとの間の設定温度近傍に維持するようになっている。
【００１４】
また冷蔵庫では、前記圧縮機１４の作動・停止に関係なく前記庫内ファン２４を連続運転する通常運転モードと、圧縮機１４の停止時には庫内ファン２４を間欠運転する省エネ運転モードとに切替え可能に設定される。なお、運転モードの切替えは、図示しない運転モード切替えスイッチにより行なわれるようになっている。そして、実施例の冷蔵庫では、通常運転モードにおける圧縮機１４が作動する第１の上限設定温度Ｃ₁と、前記省エネ運転モードにおける圧縮機１４が作動する第２の上限設定温度Ｃ₂とが別々に設定され、前記制御装置３４では、運転モード切替えスイッチにより運転モードが切替えられたときには、圧縮機１４を作動させるための上限設定温度が、選択された運転モードに対応する第１の上限設定温度Ｃ₁または第２の上限設定温度Ｃ₂に自動的に切替えられるように設定してある。なお、制御装置３４は、前記庫内サーモ２０からの温度情報を基に前記圧縮機１４をＯＮ−ＯＦＦ制御すると共に、省エネ運転モード時における前記庫内ファン２４の間欠運転サイクルを制御する制御部や、圧縮機１４をＯＮ−ＯＦＦ制御するための第１の上限設定温度Ｃ₁、第２の上限設定温度Ｃ₂や下限設定温度Ｃ等が設定記憶される記憶部(何れも図示せず)等を備える。
【００１５】
前記第２の上限設定温度Ｃ₂は、第１の上限設定温度Ｃ₁よりＴ度だけ低い値に設定されるものであって、この温度差Ｔは、省エネ運転モードにおける庫内中心温度と庫内サーモ２０の検出温度との差から経験的に取得される。また第２の上限設定温度Ｃ₂(温度差Ｔ)は、省エネ運転モード時における庫内ファン２４の稼働率に応じて変化するため、前記制御装置３４では庫内ファン２４の稼働率に応じて温度差Ｔを設定変更するよう構成されている。
【００１６】
【実施例の作用】
次に、実施例に係る冷蔵庫につき、図２のタイミングチャートを参照して説明する。
【００１７】
(通常運転モード)
冷凍装置の運転を開始すると、前記圧縮機１４および空冷ファン２２が作動(ＯＮ)し、圧縮機１４で圧縮された気化冷媒は凝縮器１６で液化し、この液化冷媒は膨張弁１０で減圧され、前記冷却器１２中で蒸発して庫内空気と熱交換を行なう。そして、蒸発気化した冷媒は、吸入管３０を経て圧縮機１４に帰還するサイクルを繰返す。また前記庫内ファン２４は連続運転され、冷却器１２で冷却された冷気を庫内に循環させることで庫内が冷却される。
【００１８】
前記冷媒の循環により庫内温度が徐々に低下し、前記庫内サーモ２０が下限設定温度Ｃを検出すると、前記圧縮機１４は停止(ＯＦＦ)される。圧縮機１４の停止(ＯＦＦ)により冷媒は冷却器１２に循環されなくなるので、庫外からの侵入熱等により庫内温度は経時的に上昇し、前記庫内サーモ２０が第１の上限設定温度Ｃ₁を検出すると、前記圧縮機１４が作動(ＯＮ)し、冷却器１２への冷媒の供給が再開されることで、冷却器１２の蒸発温度が下がり、庫内ファン２４の作動により循環される冷気により庫内は徐々に冷却される。そして、庫内サーモ２０が下限設定温度Ｃを検出すると、再び圧縮機１４が停止(ＯＦＦ)され、以後はこのサイクルが繰返されることで庫内温度は設定温度近傍に維持される。
【００１９】
(省エネ運転モード)
例えば、前記圧縮機１４の作動中に前記運転モード切替えスイッチにより通常運転モードから省エネ運転モードに切替えられると、前記庫内サーモ２０が下限設定温度Ｃを検出して圧縮機１４が停止(ＯＦＦ)したときには、前記庫内ファン２４は所定のサイクルで間欠運転するよう制御される。この場合において、図５を参照して前述した如く、圧縮機１４が停止して庫内ファン２４も停止すると、庫内冷気が循環されなくなり、庫内中心温度は圧縮機１４の停止と同時に上昇するのに対して、庫内サーモ２０の検出温度は冷えている冷却器１２の影響を受けて圧縮機１４の停止後もＴ₁時間は引続き低下するために、庫内中心温度と検出温度との間に所定の差を生ずる。この状態で庫外からの侵入熱等により庫内温度が経時的に上昇し、庫内サーモ２０が第２の上限設定温度Ｃ₂を検出すると、前記圧縮機１４が作動(ＯＮ)し、冷却器１２への冷媒の供給が再開される。このときの第２の上限設定温度Ｃ₂は、前記第１の上限設定温度Ｃ₁よりＴ度だけ低い値に設定されているから、庫内中心温度が第１の上限設定温度Ｃ₁を越える前に圧縮機１４が作動を開始し、庫内温度の上限と下限との差を小さくすることができる。
【００２０】
前述したように実施例では、通常運転モードと省エネ運転モードとが切替えられたときには、前記圧縮機１４が作動を開始する上限設定温度を第１の上限設定温度Ｃ₁または第２の上限設定温度Ｃ₂に自動的に切替えるようにしたから、省エネ運転モードにおける庫内温度差を小さくすることができ、貯蔵物の温度を均一に保持してその劣化を抑制し得る。しかも省エネ運転モードでは庫内ファン２４を間欠運転することで、該ファン２４の稼働率を低下させて消費電力を低下することができる。更に、省エネ運転モード時における庫内ファン２４の稼働率に応じて、前記第２の上限設定温度Ｃ₂を変更することで、庫内温度差をより小さくすることが可能となる。
【００２１】
なお、実施例では省エネ運転モードとして、圧縮機の停止時に庫内ファンを間欠運転する場合で説明したが、該省エネ運転モードとしては、圧縮機の停止(ＯＦＦ)と同期して庫内ファンも停止(ＯＦＦ)させるものであってもよい。すなわち、この場合は、圧縮機の作動(ＯＮ)・停止(ＯＦＦ)と同期して、庫内ファンが作動(ＯＮ)・停止(ＯＦＦ)する。
【００２２】
【発明の効果】
以上に説明した如く、本発明に係る貯蔵庫では、通常運転モードと省エネ運転モードとにおける圧縮機を作動する上限設定温度を別々に設定して切替えるようにしたから、省エネ運転モード時における庫内温度差を小さくして貯蔵物の温度を均一に保持することができる。また、省エネ運転モード時における第２の上限設定温度を、通常運転モード時における第１の上限設定温度よりＴ度だけ低く設定することで、省エネ運転モード時において庫内温度が第１の上限設定温度より高くなるのを防止でき、貯蔵物の劣化を抑制し得る。更に、第２の上限設定温度を省エネ運転モード時における庫内ファンの稼働率に応じて設定することで、庫内温度差をより小さくすることができる。
【図面の簡単な説明】
【図１】本発明の実施例に係る冷蔵庫における冷凍装置の概略構成図である。
【図２】実施例に係る圧縮器の運転状態を示すタイミングチャート図である。
【図３】従来の冷蔵庫における冷凍装置の概略構成図である。
【図４】通常運転モードにおける圧縮機および庫内ファンの運転状態を示すタイミングチャート図である。
【図５】省エネ運転モードにおける圧縮機および庫内ファンの運転状態を示すタイミングチャート図である。
【符号の説明】
１２冷却器，１４圧縮機，１６凝縮器，２０庫内サーモ(温度検出手段)
２４庫内ファン，Ｃ₁第１の上限設定温度，Ｃ下限設定温度
Ｃ₂第２の上限設定温度[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage box, more particularly, by ON-OFF controlling the operation of the compressor constituting the refrigeration apparatus according to the internal temperature with keeping the refrigerator at a constant temperature, the compressor those concerning the storage chamber configured to be subjected to energy saving operation mode to shift to or or intermittent operation is stopped in synchronization with the internal fan during stops.
[0002]
[Prior art]
As shown in FIG. 3, a refrigeration apparatus equipped in a refrigerator (storage) that cools and stores stored items stored in a warehouse has (1) expansion valves 10 and (2) that expand high-pressure liquefied refrigerant into vaporized refrigerant. ▼ Cooler 12 that performs cooling action by heat of vaporization taken when this liquefied refrigerant evaporates, and (3) compression that sends the vaporized refrigerant that has been cooled by this cooler 12 to the condenser in a compressed state. Machine 14 and {circle around (4)} A condenser 16 and the like are built in which the vaporized refrigerant compressed by the compressor 14 is condensed to form a liquefied refrigerant. In addition, an in-compartment thermo 20 is disposed inside the refrigerator 18, and the operation control (ON-OFF control) of the compressor 14 is performed in accordance with temperature information in the interior detected by the thermo 20. . The condenser 16 is provided with an air cooling fan 22, and forced air cooling is performed by the rotation of the fan 22. Further, an internal fan 24 is provided inside the refrigerator 18, and the cold air cooled by the cooler 12 is configured to circulate in the internal space by operating the internal fan 24.
[0003]
In the refrigeration apparatus, when the compressor 14 and the air cooling fan 22 are activated (ON) to start the cooling operation, the refrigerant circulated and supplied to the cooler 12 disposed inside the refrigerator 18 and the internal fan The internal temperature is gradually lowered by heat exchange with the internal air circulated by the air 24. When the internal temperature decreases and the temperature reaches the lower limit set temperature (for example, a value 2 ° C. lower than the set temperature) of the internal thermo 20, the compressor 14 and the air cooling fan 22 are stopped (OFF). The internal temperature rises with time due to intrusion heat or the like from the outside, and when the internal temperature reaches the upper limit set temperature of the internal thermo 20 (for example, a value 2 ° C. higher than the set temperature), the compressor 14 and the air are cooled. The fan 22 is activated (ON), and the cooling operation is resumed again (see FIG. 4). By repeating the above cycle, the internal temperature is maintained near the set temperature.
[0004]
In the normal operation mode of the refrigerator, the internal fan 24 is continuously operated regardless of the operation / stop state of the compressor 14 (see FIG. 4). However, since the power consumption increases when the internal fan 24 is continuously operated, the operation rate of the fan 24 is changed by switching to the energy saving operation mode in which the internal fan 24 is intermittently operated when the compressor 14 is stopped (see FIG. 5). Control to reduce the energy is performed (for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-166377 (FIG. 3)
[0006]
[Problems to be solved by the invention]
The in-compartment thermo 20 for detecting the in-compartment temperature is disposed in the vicinity of the suction side of the in-compartment air to the cooler 12 in order to detect the temperature of the cool air that has circulated in the interior and has risen the most. . In this case, in the above-described energy saving operation mode, as shown in FIG. 5, since the internal fan 24 is operating (ON) while the compressor 14 is operating, the internal cold air is circulated and the internal center temperature is And the mounting portion temperature (detected temperature) of the inside thermo 20 are substantially the same. However, when the compressor 14 is stopped and the internal fan 24 is also stopped, the internal cold air is no longer circulated, and the temperature of the mounting portion of the internal thermo 20 is affected by the cooler 12 being cooled, and the compressor 14 also T ₁ times decreases continued after stopping, is then raised.
[0007]
On the other hand, since the internal chamber temperature rises simultaneously with the stop of the compressor 14, when the detected temperature of the internal thermo 20 reaches the upper limit set temperature, there is a temperature difference T between the internal temperature and the internal temperature. It will occur. That is, since the ON / OFF control of the compressor 14 is performed based on the detected temperature of the internal thermo 20, when the detected temperature reaches the upper limit set temperature for operating the compressor 14, the internal center temperature is It will be higher by T degrees than the upper limit set temperature. Therefore, in the energy saving operation mode, compared with the normal operation mode, the upper limit temperature of the center temperature inside the cabinet is higher, and the difference from the lower limit temperature is increased, so that the stored item may be deteriorated. That is, the temperature range K ₁ in the refrigerator in the normal operating mode shown in FIG. 4, it is compared with the temperature range K ₂ in the refrigerator in the energy saving operation mode shown in FIG. 5, the K ₁ <K _2.
[0008]
OBJECT OF THE INVENTION
In view of the above disadvantages inherent in the storage box according to the prior art, which have was proposed to suitably solve, by reducing the temperature difference in the refrigerator in the energy saving operation mode and to provide a storage box capable of suppressing the deterioration of the storage items.
[0009]
[Means for Solving the Problems]
Order to solve the above problems, to achieve the intended purpose, the storage box according to the present invention,
A refrigeration system comprising a compressor, a condenser, a cooler, etc., an internal fan that circulates the cool air cooled by the cooler, and a suction side of the internal air to the cooler And a temperature detecting means for detecting the internal temperature, and is configured to operate the compressor when the temperature detecting means detects the upper limit set temperature and to stop the compressor when the lower limit set temperature is detected. The normal operation mode in which the internal fan is continuously operated regardless of the operation / stop of the compressor, the internal fan is continuously operated when the compressor is operating, and the internal fan is stopped synchronously when the compressor is stopped. Or in a warehouse set to be switchable to energy saving operation mode that operates intermittently,
Upper limit set temperature, the first upper limit set temperature compressor in the normal operation mode is activated, the compressor is operated in the energy saving operation mode, the detection of the internal center temperature and the temperature detecting means in該省energy operating mode A second upper limit set temperature lower than the first upper limit set temperature by a temperature difference T degrees generated between the temperature and the temperature ,
The lower limit set temperature is set to a common temperature in the normal operation mode and the energy saving operation mode,
When the operation mode is switched, the upper limit set temperature at which the compressor operates is automatically switched to the first or second upper limit set temperature corresponding to the selected operation mode. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Then, per storage box according to the present invention, by way of preferred embodiments will be described below with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of a refrigeration apparatus equipped in a refrigerator as a storage according to an embodiment, and the basic configuration is the same as that described with reference to FIG. It shall be indicated with the same code.
[0011]
That is, the discharge pipe 26 led out from the discharge side of the compressor 14 is connected to the inlet side of the condenser 16, and the refrigerant supply pipe 28 led out from the condenser 16 is connected to the inside of the refrigerator 18 through the expansion valve 10. It is connected to the inlet side of the arranged cooler 12. The suction pipe 30 led out from the outlet side of the cooler 12 is connected to the suction side of the compressor 14.
[0012]
The cooler 12 is covered with a duct 32 disposed in the warehouse, and an internal fan 24 is disposed at an air outlet 32 a opened above the duct 32 and cooled by the cooler 12. The cool air is configured to be blown into the cabinet by operating the fan 24. An air suction port 32b is opened below the duct 32, and the cool air circulated in the warehouse is sucked through the suction port 32b and cooled by the cooler 12 again.
[0013]
An in-compartment thermo 20 serving as temperature detecting means is disposed in the duct 32 in the vicinity of the suction port 32b, and the detected temperature (temperature information) of the in-compartment thermo 20 is output to a control device 34 such as a microcomputer. The The control device 34 is configured to control the operation of the compressor 14 (ON-OFF control) based on the temperature information from the internal thermostat 20. That is, when the internal temperature reaches the upper limit set temperatures C _{1 and} C ₂ preset in the internal thermo 20, the compressor 14 is operated (ON), and when the internal temperature reaches the lower limit set temperature C, it is stopped (OFF). It is controlled as follows. By performing ON-OFF control of the compressor 14 in this way, the internal temperature is maintained in the vicinity of the set temperature between the upper limit set temperature C _1, C ₂ and the lower limit set temperature C.
[0014]
The refrigerator can be switched between a normal operation mode in which the internal fan 24 is continuously operated regardless of the operation / stop of the compressor 14 and an energy saving operation mode in which the internal fan 24 is intermittently operated when the compressor 14 is stopped. Set to The operation mode is switched by an operation mode switching switch (not shown). In the refrigerator of the embodiment, the first upper limit set temperature C _{1 at} which the compressor 14 operates in the normal operation mode and the second upper limit set temperature C _{2 at} which the compressor 14 operates in the energy saving operation mode are separated. In the control device 34, when the operation mode is switched by the operation mode changeover switch, the upper limit set temperature for operating the compressor 14 is the first upper limit set temperature corresponding to the selected operation mode. It is set so as to be automatically switched to C ₁ or the second upper limit set temperature C ₂ . The controller 34 controls the compressor 14 on and off based on temperature information from the internal thermostat 20 and controls an intermittent operation cycle of the internal fan 24 in the energy saving operation mode. And a storage unit (not shown) in which the first upper limit set temperature C ₁ , the second upper limit set temperature C ₂ , the lower limit set temperature C, and the like for ON / OFF control of the compressor 14 are set and stored. Etc.
[0015]
The second upper limit set temperature C ₂ is set to a value that is lower by T degrees than the first upper limit set temperature C ₁ , and this temperature difference T is determined by the center temperature in the store and the store in the energy saving operation mode. It is obtained empirically from the difference from the detected temperature of the inner thermo 20. Further, since the second upper limit set temperature C ₂ (temperature difference T) changes according to the operating rate of the internal fan 24 in the energy saving operation mode, the control device 34 corresponds to the operating rate of the internal fan 24. The temperature difference T is configured to be changed.
[0016]
[Effect of the embodiment]
Then, per refrigerator according to the embodiment will be described with reference to the timing chart of FIG.
[0017]
(Normal operation mode)
When the operation of the refrigeration apparatus is started, the compressor 14 and the air cooling fan 22 are activated (ON), the vaporized refrigerant compressed by the compressor 14 is liquefied by the condenser 16, and the liquefied refrigerant is decompressed by the expansion valve 10. Then, it evaporates in the cooler 12 to exchange heat with the air in the cabinet. The evaporated vaporized refrigerant repeats a cycle of returning to the compressor 14 via the suction pipe 30. The internal fan 24 is continuously operated, and the internal space is cooled by circulating the cool air cooled by the cooler 12 in the internal space.
[0018]
When the internal temperature gradually decreases due to the circulation of the refrigerant and the internal thermo 20 detects the lower limit set temperature C, the compressor 14 is stopped (OFF). Since the refrigerant is not circulated to the cooler 12 when the compressor 14 is stopped (OFF), the internal temperature rises with time due to intrusion heat or the like from outside the internal storage, and the internal thermo 20 has the first upper limit set temperature. When C ₁ is detected, the compressor 14 is activated (ON), and the supply of the refrigerant to the cooler 12 is resumed, whereby the evaporation temperature of the cooler 12 is lowered and circulated by the operation of the internal fan 24. The cooler gradually cools the interior. When the in-compartment thermo 20 detects the lower limit set temperature C, the compressor 14 is stopped (OFF) again, and thereafter, the in-compartment temperature is maintained near the set temperature by repeating this cycle.
[0019]
(Energy saving operation mode)
For example, when the operation mode changeover switch is used to switch from the normal operation mode to the energy saving operation mode while the compressor 14 is operating, the internal thermostat 20 detects the lower limit set temperature C and the compressor 14 is stopped (OFF). When this occurs, the internal fan 24 is controlled to intermittently operate in a predetermined cycle. In this case, as described above with reference to FIG. 5, when the compressor 14 is stopped and the internal fan 24 is also stopped, the internal cold air is not circulated, and the internal temperature of the internal chamber rises simultaneously with the stop of the compressor 14. relative to, after detecting the temperature cools and stopping of the cooler 12 compressor 14 under the influence of the internal thermo-20 in order to decrease ₁ hour continues T, and-compartment central temperature and the detected temperature A predetermined difference is produced between the two. In this state, when the internal temperature rises with time due to intrusion heat or the like from the outside, and the internal thermo 20 detects the _second upper limit set temperature C ₂ , the compressor 14 is activated (ON) and cooled. Supply of the refrigerant to the vessel 12 is resumed. Since the second upper limit set temperature C _{2 at} this time is set to a value lower by T degrees than the first upper limit set temperature C ₁ , the in-chamber center temperature exceeds the first upper limit set temperature C ₁ . Before the compressor 14 starts operating, the difference between the upper limit and the lower limit of the internal temperature can be reduced.
[0020]
As described above, in the embodiment, when the normal operation mode and the energy saving operation mode are switched, the upper limit set temperature at which the compressor 14 starts to operate is set to the first upper limit set temperature C ₁ or the second upper limit set temperature. it is so arranged automatically switched to C _2, it is possible to reduce the inside temperature difference in the energy saving operation mode can suppress the deterioration by uniformly maintaining the temperature of the reservoir. In addition, by operating the internal fan 24 intermittently in the energy saving operation mode, the operating rate of the fan 24 can be reduced and the power consumption can be reduced. Furthermore, by changing the _second upper limit set temperature C ₂ according to the operating rate of the internal fan 24 in the energy saving operation mode, the internal temperature difference can be further reduced.
[0021]
In the embodiment, the energy saving operation mode has been described in the case where the internal fan is intermittently operated when the compressor is stopped. However, the energy saving operation mode includes an internal fan that is synchronized with the compressor stop (OFF). You may make it stop (OFF). That is, in this case, the internal fan operates (ON) and stops (OFF) in synchronization with the operation (ON) and stop (OFF) of the compressor .
[0022]
【The invention's effect】
As described above, in the storage box according to the present invention, since the upper limit was set temperature for operating the compressor in a normal operation mode and the energy saving operation mode to switch and set separately, the refrigerator in the energy saving operation mode The internal temperature difference can be reduced to keep the temperature of the stored product uniform. Further, by setting the second upper limit set temperature in the energy saving operation mode by T degrees lower than the first upper limit set temperature in the normal operation mode, the internal temperature is set to the first upper limit setting in the energy saving operation mode. It is possible to prevent the temperature from becoming higher than the temperature, and it is possible to suppress deterioration of the stored product. Furthermore, by setting the second upper limit set temperature according to the operating rate of the internal fan in the energy saving operation mode, the internal temperature difference can be further reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a refrigeration apparatus in a refrigerator according to an embodiment of the present invention.
FIG. 2 is a timing chart illustrating an operation state of the compressor according to the embodiment.
FIG. 3 is a schematic configuration diagram of a refrigeration apparatus in a conventional refrigerator.
FIG. 4 is a timing chart showing operating states of the compressor and the internal fan in the normal operation mode.
FIG. 5 is a timing chart showing operating states of the compressor and the internal fan in the energy saving operation mode.
[Explanation of symbols]
12 Cooler, 14 Compressor, 16 Condenser, 20 Inside thermo (temperature detection means)
24 Internal fan, C ₁ first upper limit set temperature, C lower limit set temperature C ₂ second upper limit set temperature

Claims

A refrigeration apparatus comprising a compressor (14), a condenser (16), a cooler (12), and the like; an internal fan (24) that circulates cold air cooled by the cooler (12); A temperature detection means (20) that is disposed in the vicinity of the suction side of the internal air to the cooler (12) and detects the internal temperature, and when the temperature detection means (20) detects the upper limit set temperature The compressor (14) is operated and the compressor (14) is stopped when a lower limit set temperature (C) is detected, and the interior of the warehouse is controlled regardless of whether the compressor (14) is operated or stopped. a normal operation mode to continuous operation of the fan (24), during operation of the compressor (14) is continuously operated internal fan (24), in synchronization with the internal fan when the compressor is stopped (14) (24) In a storehouse that can be switched to energy-saving operation mode that stops or intermittent operation,
The upper limit set temperature includes a first upper limit set temperature (C ₁ ) at which the compressor (14) in the normal operation mode operates, and a compressor (14) in the energy saving operation mode that operates in the energy saving operation mode. A second upper limit set temperature (C ₂ ) lower than the first upper limit set temperature (C ₁ ) is set by a temperature difference T degrees generated between the chamber center temperature and the temperature detected by the temperature detecting means (20). ,
The lower limit set temperature (C) is set to a common temperature in the normal operation mode and the energy saving operation mode,
When the operation mode is switched, the upper limit set temperature at which the compressor (14) operates is automatically set to the first or second upper limit set temperature (C ₁ , C ₂ ) corresponding to the selected operation mode. storage box, characterized in that the operation is switched to.

Said second upper limit set temperature (C _2), the storage box of claim 1 wherein the set according to the operation rate of the in-compartment fan in the energy saving operation mode (24).