JP3271699B2 - Open showcase driving method - Google Patents
Open showcase driving methodInfo
- Publication number
- JP3271699B2 JP3271699B2 JP19506897A JP19506897A JP3271699B2 JP 3271699 B2 JP3271699 B2 JP 3271699B2 JP 19506897 A JP19506897 A JP 19506897A JP 19506897 A JP19506897 A JP 19506897A JP 3271699 B2 JP3271699 B2 JP 3271699B2
- Authority
- JP
- Japan
- Prior art keywords
- cooler
- main
- defrosting
- auxiliary
- main cooler
- 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 - Lifetime
Links
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Defrosting Systems (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複数の冷却器を設
置して交互に除霜運転を行うことにより除霜運転時の庫
内温度変動を抑えたオープンショーケースの運転方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating an open showcase in which a plurality of coolers are installed and defrosting operations are alternately performed to suppress fluctuations in the internal temperature during defrosting operations.
【０００２】[0002]
【従来の技術】従来から、複数の冷却器を設置して交互
に除霜運転を行うことにより、除霜運転時の貯蔵室内の
温度（庫内温度）の変動を抑えるようにした、いわゆる
ノンデフケースが多く用いられている。しかし、この従
来のノンデフケースは、交互に除霜を行う一対の冷却器
の大きさや運転時間が同じであり、除霜運転の間隔（イ
ンターバル）も、店舗の営業時間についての考慮は全く
なされていなかった。2. Description of the Related Art Conventionally, a plurality of coolers have been installed and defrosting operations have been performed alternately to suppress fluctuations in the temperature (in-compartment temperature) in a storage room during defrosting operation. Differential cases are often used. However, in this conventional non-defective case, the size and the operation time of a pair of coolers that perform defrosting alternately are the same, and the interval of the defrosting operation (interval) does not take into account the business hours of the store. Did not.
【０００３】また、主冷却器（内層ダクト内）と補助冷
却器（外層ダクト内）とを使用して両冷却器の大きさや
運転時間を変えるようにしたものもあるが、システム的
にも取り付け構造的にも複雑となり、この場合も、前記
同様に、店舗の営業時間の考慮はなされていなかった。[0003] In some cases, the size and operation time of both coolers are changed by using a main cooler (in an inner duct) and an auxiliary cooler (in an outer duct). The structure becomes complicated, and in this case as well, the business hours of the store are not taken into account as described above.
【０００４】[0004]
【発明が解決しようとする課題】一方、大型店舗では、
商品をその日のうちに売り切ることが前提であるが、最
近は、半凍結状態のチルド肉や刺身、切身、さく等を陳
列する場合もあり、除霜運転時の僅かな温度上昇でも、
これらの半凍結品には大きなダメージを与えるため、鮮
度志向の店では大きな問題となっている。On the other hand, in a large store,
It is premised that the product will be sold out on the same day, but recently, chilled meat, sashimi, fillet, crust etc. in semi-frozen state may be displayed, even if the temperature rises slightly during defrosting operation,
These semi-frozen products cause great damage and are a big problem in freshness-oriented stores.
【０００５】本発明は上記の実情に鑑みなされたもの
で、その目的とするところは、主冷却器と補助冷却器と
を所定のタイミングで冷却運転と除霜運転とに切り換え
ることにより、除霜運転中でも庫内温度の上昇を抑える
ことができ、半凍結品の陳列も問題なく行うことができ
るオープンショーケースの運転方法を提供することにあ
る。The present invention has been made in view of the above circumstances, and an object of the present invention is to switch a main cooler and an auxiliary cooler between a cooling operation and a defrosting operation at a predetermined timing to perform defrosting. It is an object of the present invention to provide a method of operating an open showcase that can suppress a rise in the internal temperature during operation and can display a semi-frozen product without any problem.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
め、本発明においては、断熱壁により構成された本体内
に前面が開口した貯蔵室を形成し、該貯蔵室の開口部
を、貯蔵室の上部前端に設けた吹出口から下方に向けて
吹き出される冷気のエアカーテンで覆うことにより貯蔵
室内を冷却するオープンショーケースにおいて、前記貯
蔵室と区画形成されたダクト内に、主冷却器を設けると
ともに、該主冷却器に対して風下側に、前記主冷却器の
除霜運転時に冷却運転を行う補助冷却器を設け、前記主
冷却器と補助冷却器とを交互に運転することを特徴とし
ている。In order to solve the above-mentioned problems, according to the present invention, a storage chamber having a front opening is formed in a main body constituted by a heat insulating wall, and an opening of the storage chamber is stored in the storage chamber. In an open showcase that cools a storage room by covering it with an air curtain of cold air blown downward from an air outlet provided at an upper front end of the room, a main cooler is provided in a duct defined by the storage room. And an auxiliary cooler that performs a cooling operation during the defrosting operation of the main cooler is provided on the leeward side of the main cooler, and the main cooler and the auxiliary cooler are alternately operated. Features.
【０００７】上述のように、主冷却器が除霜運転を行っ
ているときに、風下側に設けた補助冷却器で冷却運転を
行い、主冷却器が通常の冷却運転を行っているときには
補助冷却器の冷却運転を停止し、両冷却器を交互に運転
することにより、貯蔵室内に吹き出す冷気の温度上昇を
確実に防止できる。As described above, when the main cooler is performing the defrosting operation, the cooling operation is performed by the auxiliary cooler provided on the leeward side, and when the main cooler is performing the normal cooling operation, the auxiliary cooling is performed. By stopping the cooling operation of the coolers and alternately operating both coolers, it is possible to reliably prevent the temperature of the cool air blown into the storage room from rising.
【０００８】さらに、本発明のオープンショーケースの
運転方法では、前記主冷却器の除霜運転をオフサイクル
方式で行い、該主冷却器に着霜した氷の融解潜熱を、補
助冷却器の冷却運転に付加して利用する。このように主
冷却器の除霜をオフサイクルで行うことにより、除霜運
転時に主冷却器から吹き出す冷気の温度を０℃程度とな
るため、補助冷却器の負担を軽減できるとともに着霜量
も少なくできる。Further, in the operating method of the open showcase of the present invention, the defrosting operation of the main cooler is performed in an off-cycle system, and the latent heat of melting of ice frosted on the main cooler is cooled by the auxiliary cooler. Use in addition to driving. By performing the defrosting of the main cooler in the off cycle as described above, the temperature of the cool air blown out from the main cooler during the defrosting operation becomes approximately 0 ° C., so that the load on the auxiliary cooler can be reduced and the amount of frost formation can be reduced. Can be reduced.
【０００９】また、前記主冷却器の冷却運転延べ時間
を、前記補助冷却器の冷却運転延べ時間より長く設定す
ることにより、冷却運転中の主冷却器から吹き出す低温
の冷気で補助冷却器の除霜を行うことが可能となり、補
助冷却器の除霜運転をオフサイクル方式で行うことがで
きるので、補助冷却器を経て吹き出す冷気温度が過度に
上昇することがなくなる。Further, by setting the total cooling operation time of the main cooler to be longer than the total cooling operation time of the auxiliary cooler, the auxiliary cooler is removed by low-temperature cold air blown from the main cooler during the cooling operation. Defrosting can be performed, and the defrosting operation of the auxiliary cooler can be performed in an off-cycle manner, so that the temperature of the cool air blown out through the auxiliary cooler does not excessively increase.
【００１０】さらに、主冷却器の除霜運転終了後も、前
記補助冷却器の冷却運転を所定時間継続することによ
り、主冷却器による冷気の冷却温度が所定温度になるま
での間の温度上昇を防止できる。また、除霜運転の間隔
を、オープンショーケースの設置場所における営業時間
中と非営業時間中とによって異なる設定とし、負荷が減
少する非営業時間中の主冷却器の除霜運転を長時間かけ
て行うことにより、主冷却器の除霜をより確実に行うこ
とができる。[0010] Further, after the defrosting operation of the main cooler is completed, the cooling operation of the auxiliary cooler is continued for a predetermined time, thereby increasing the temperature until the cooling temperature of the cool air by the main cooler reaches the predetermined temperature. Can be prevented. In addition, the interval of the defrosting operation is set differently during business hours and during non-business hours at the place where the open showcase is installed, and the defrosting operation of the main cooler during non-business hours when the load decreases is extended. By doing so, defrosting of the main cooler can be performed more reliably.
【００１１】[0011]
【発明の実施の形態】以下、本発明の好ましい実施の形
態を図に基づいて説明する。まず、図１は主冷却器と補
助冷却器とを設けたオープンショーケースの断面側面図
である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a sectional side view of an open showcase provided with a main cooler and an auxiliary cooler.
【００１２】このオープンショーケース１は、断熱壁２
により構成された本体３内に前面が開口した多段式の貯
蔵室４を形成し、本体３の背面に外層ダクト５と内層ダ
クト６とを設けるとともに、内層ダクト６内に主冷却器
７と補助冷却器８とを配設したものである。外層ダクト
５及び内層ダクト６には、各ダクト内に冷気を循環させ
るための外層ファン９と内層ファン１０とがそれぞれ設
けられている。また、主冷却器７の直前には、補助ヒー
タ１１が、主冷却器７の上部には防氷ヒータ１２が、そ
れぞれ設けられている。The open showcase 1 has a heat insulating wall 2
A multi-stage storage room 4 having an open front is formed in a main body 3 composed of a main body 3 and an outer-layer duct 5 and an inner-layer duct 6 are provided on the back of the main body 3, and a main cooler 7 and an auxiliary are provided in the inner-layer duct 6. A cooler 8 is provided. The outer-layer duct 5 and the inner-layer duct 6 are provided with an outer-layer fan 9 and an inner-layer fan 10 for circulating cool air in each duct, respectively. An auxiliary heater 11 is provided immediately before the main cooler 7, and an anti-icing heater 12 is provided above the main cooler 7.
【００１３】本体３の上部前端位置には、ハニカム構造
の冷気の吹出口１３がケース長手方向全体に亘って設け
られ、ここから内外各ダクトからの冷気をエアカーテン
として下方に整流して吹き出し、ケースの前面開口部を
覆うとともに、貯蔵室４内を冷却するようにしている。
また、本体３の下部前面部には、内外各ダクトに通じる
吸込口１４が設けられており、この吸込口１４から外層
ファン９及び内層ファン１０により吸い込まれた冷気
が、外層ダクト５及び内層ダクト６にそれぞれ送り込ま
れる。さらに、貯蔵室４の背面パネル１５には、多孔板
が用いられており、両冷却器７，８で冷却された冷気が
内層ダクト６から直接貯蔵室４内に吹き出すように形成
されている。At the upper front end position of the main body 3, a cold air outlet 13 having a honeycomb structure is provided over the entire longitudinal direction of the case, from which the cool air from each of the inner and outer ducts is rectified and blown downward as an air curtain. The front opening of the case is covered and the inside of the storage room 4 is cooled.
In addition, a suction port 14 communicating with each of the inner and outer ducts is provided in a lower front portion of the main body 3, and cool air sucked by the outer layer fan 9 and the inner layer fan 10 from the suction port 14 is supplied to the outer layer duct 5 and the inner layer duct. 6 respectively. Further, a perforated plate is used for the rear panel 15 of the storage room 4, and the cool air cooled by the two coolers 7 and 8 is formed so as to blow out from the inner layer duct 6 directly into the storage room 4.
【００１４】外層ダクト５を流れる冷気は、断熱層とし
て作用した後、前記吹出口１３から吹き出して吸込口１
４に循環する。また、内層ダクト６内に流入した冷気
は、主冷却器７あるいは補助冷却器８で冷却されて所定
温度となり、前記同様に前記吹出口１３から吹き出して
循環する。The cold air flowing through the outer layer duct 5 acts as a heat insulating layer, and then blows out from the outlet 13 to be drawn into the inlet 1.
Cycle to 4. The cool air that has flowed into the inner duct 6 is cooled by the main cooler 7 or the auxiliary cooler 8 to a predetermined temperature, and is blown out from the outlet 13 and circulated as described above.
【００１５】次に、図２乃至図４により、各運転状態を
説明する。図２乃至図４は、冷凍サイクルにおける主冷
却器７及び補助冷却器８部分の配管系統を示す説明図で
あって、白抜きの弁が開弁状態で、黒塗りの弁が閉弁状
態であることを示している。また、ハッチングを施した
冷却器は冷却運転中、白抜きの冷却器はオフサイクル方
式により除霜運転中を表している。Next, each operation state will be described with reference to FIGS. 2 to 4 are explanatory diagrams showing a piping system of the main cooler 7 and the auxiliary cooler 8 in the refrigeration cycle, in which the white valves are open and the black valves are closed. It indicates that there is. The hatched coolers indicate the cooling operation, and the white coolers indicate the off-cycle method during the defrosting operation.
【００１６】まず、主冷却器７及び補助冷却器８の高圧
配管２１は、液電磁弁２２，２３の上流側で分岐してお
り、所定容量の膨張弁２４，２５を介してそれぞれ接続
している。また、両冷却器の７，８の吸入配管２６，２
７は、合流後に圧縮機（図示せず）に接続している。First, the high-pressure pipes 21 of the main cooler 7 and the auxiliary cooler 8 are branched on the upstream side of the liquid solenoid valves 22, 23, and are connected via expansion valves 24, 25 of a predetermined capacity, respectively. I have. Also, the suction pipes 26, 2 of the cooling units 7, 8 are provided.
7 is connected to a compressor (not shown) after merging.
【００１７】最初に、図２は、主冷却器７が運転中の状
態を示すもので、主冷却器７の液電磁弁２２が開、補助
冷却器８の液電磁弁２３が閉であり、補助冷却器８は、
冷媒が供給されないオフサイクル除霜中の状態となって
いる。この状態では、内層ダクト６内に流入した冷気
は、運転中の主冷却器７で所定温度に冷却された後、補
助冷却器８を通過して前記吹出口１３や背面パネル１５
から吹き出し、貯蔵室４内を所定温度に維持する。First, FIG. 2 shows a state in which the main cooler 7 is in operation. The liquid solenoid valve 22 of the main cooler 7 is open, the liquid solenoid valve 23 of the auxiliary cooler 8 is closed, The auxiliary cooler 8 is
An off-cycle defrosting state in which no refrigerant is supplied is being performed. In this state, the cool air that has flowed into the inner duct 6 is cooled to a predetermined temperature by the main cooler 7 during operation, and then passes through the auxiliary cooler 8 so as to pass through the outlet 13 and the rear panel 15.
And the inside of the storage room 4 is maintained at a predetermined temperature.
【００１８】一方、補助冷却器８は、主冷却器７から吹
き出す冷風が通過することによって前回の冷却運転で着
霜したコイル面のオフサイクル除霜が行われる。このオ
フサイクル除霜は、冷気の通過によって行われるため、
除霜の効率は良くないが、後述のように、この補助冷却
器８の運転時間自体が短く、このときの吸入冷気の温度
が低いために着霜量はさほど多くないため、時間をかけ
れば完全に補助冷却器８のオフサイクル除霜を行うこと
ができる。On the other hand, in the auxiliary cooler 8, the off-cycle defrosting of the frosted coil surface in the previous cooling operation is performed by passing the cool air blown out from the main cooler 7. Since this off-cycle defrosting is performed by passing cool air,
Although the efficiency of defrosting is not good, as will be described later, the operation time of the auxiliary cooler 8 itself is short, and since the temperature of the intake cold air at this time is low, the amount of frost is not so large. The off-cycle defrost of the auxiliary cooler 8 can be completely performed.
【００１９】上記運転状態は、補助冷却器８のオフサイ
クル除霜を完全に行うために、例えば４〜５時間行われ
る。また、補助冷却器８の除霜運転により発生した水滴
が、主冷却器７の上部に滴下して氷として成長するのを
防止するため、前記防氷ヒータ１２を必要に応じて通電
する。この防氷ヒータ１２は、容量の小さなヒータで十
分な作用を得ることができ、極小容量のものを常時通電
させるようにしてもよく、やや大きめの容量のものを使
用して所定間隔毎に強制的に通電させるようにしてもよ
い。The above operation state is performed, for example, for 4 to 5 hours in order to completely perform the off-cycle defrosting of the auxiliary cooler 8. In order to prevent water droplets generated by the defrosting operation of the auxiliary cooler 8 from dropping on the upper part of the main cooler 7 and growing as ice, the anti-icing heater 12 is energized as necessary. The anti-icing heater 12 can obtain a sufficient effect with a heater having a small capacity. The heater having a very small capacity may be always energized, or a heater having a slightly larger capacity may be used at predetermined intervals. You may make it electrically energize.
【００２０】ここで、オープンショーケースの貯蔵室内
を生鮮品の貯蔵に適した０〜−１℃に保つ場合、吹出口
１３から−５℃程度の冷気を吹き出す必要があるが、こ
のとき、吸込口１４から吸い込まれる冷気温度は、通
常、２．０〜３．０℃となる。したがって、図にで示
す主冷却器７の入口部での冷気温度は、２．０〜３．０
℃であり、主冷却器７では、これを冷却して図にで示
す主冷却器７の出口部（補助冷却器８の入口部）での冷
気温度を平均で−４．５〜−５．５℃とする（冷却器に
おける冷媒蒸発温度は−１０〜−１３℃）。この制御
は、通常のサーモスタットによる液電磁弁２２の開閉に
より行うことができる。そして、図にで示す補助冷却
器８の出口部での冷気温度は、当初は前回の冷却運転の
影響により一時的に若干下がるが、次第にと同じ温度
に近付いてくる。これにより、貯蔵室４内を０〜−１℃
に保つことができる。Here, when the interior of the storage room of the open showcase is kept at 0-1 ° C. suitable for storing fresh products, it is necessary to blow cool air of about −5 ° C. from the outlet 13; The temperature of the cold air sucked from the mouth 14 is usually 2.0 to 3.0 ° C. Therefore, the cold air temperature at the inlet of the main cooler 7 shown in the figure is 2.0 to 3.0.
° C. In the main cooler 7, it is cooled and the average temperature of the cold air at the outlet of the main cooler 7 (the inlet of the auxiliary cooler 8) shown in the figure is -4.5 to -5. 5 ° C. (the refrigerant evaporation temperature in the cooler is −10 to −13 ° C.). This control can be performed by opening and closing the liquid solenoid valve 22 using a normal thermostat. Then, the cold air temperature at the outlet of the auxiliary cooler 8 shown in the figure temporarily decreases slightly due to the influence of the previous cooling operation, but gradually approaches the same temperature. Thereby, the inside of the storage room 4 is 0 to -1 ° C.
Can be kept.
【００２１】そして、主冷却器７が除霜運転に入ると、
図３に示す状態となり、主冷却器７の液電磁弁２２が閉
じるとともに、補助冷却器８の液電磁弁２３が開いて補
助冷却器８が冷却運転を行い、主冷却器７がオフサイク
ル除霜を行う。この状態では、図にで示す主冷却器７
の入口部での冷気温度がプラス側の２．０〜３．０℃で
あることから、主冷却器７の着霜量が多くても、通常、
３０〜４５分程度で除霜を完了することができる。Then, when the main cooler 7 enters the defrosting operation,
As shown in FIG. 3, the liquid electromagnetic valve 22 of the main cooler 7 is closed, the liquid electromagnetic valve 23 of the auxiliary cooler 8 is opened, the auxiliary cooler 8 performs a cooling operation, and the main cooler 7 is turned off. Do the frost. In this state, the main cooler 7 shown in FIG.
Since the cool air temperature at the inlet of the main cooler 7 is 2.0 to 3.0 ° C. on the positive side, even if the amount of frost on the main cooler 7 is large,
Defrosting can be completed in about 30 to 45 minutes.
【００２２】このとき、図にで示す主冷却器７の出口
部の冷気温度は、主冷却器７に着霜した氷の融解潜熱に
より冷気が冷却された結果、０〜０．５℃程度となる。
したがって、補助冷却器８は、０〜０．５℃の冷気を前
記同様の−４．５〜−５．５℃程度に冷却すればよく、
主冷却器７の氷の融解潜熱を、補助冷却器８の冷却運転
に付加して利用することにより、補助冷却器８の小形化
や小容量化が図れる。このときの補助冷却器８の運転
は、例えば、サーモスタットによる液電磁弁２３の開閉
制御によって−１．０〜−９．５℃の間で、平均温度が
−４．５〜−５．５℃になるようにすればよい。補助冷
却器８の冷却運転延べ時間を主冷却器の冷却運転延べ時
間より短くすることにより、補助冷却器８への着霜量は
極めて少ないものとすることができ、前述のオフサイク
ル除霜で完全に除霜を行うことが可能となる。At this time, the temperature of the cool air at the outlet of the main cooler 7 shown in the figure is about 0 to 0.5 ° C. as a result of the cool air being cooled by the latent heat of melting of the ice frosted on the main cooler 7. Become.
Therefore, the auxiliary cooler 8 may cool the cold air of 0 to 0.5 ° C to about -4.5 to -5.5 ° C as described above,
By using the latent heat of melting of the ice of the main cooler 7 in addition to the cooling operation of the auxiliary cooler 8, the size and capacity of the auxiliary cooler 8 can be reduced. The operation of the auxiliary cooler 8 at this time is, for example, by controlling the opening and closing of the liquid solenoid valve 23 by a thermostat, between -1.0 to -9.5 ° C, and an average temperature of -4.5 to -5.5 ° C. What should be done is. By making the total cooling operation time of the auxiliary cooler 8 shorter than the total cooling operation time of the main cooler, the amount of frost formed on the auxiliary cooler 8 can be made extremely small. Defrosting can be performed completely.
【００２３】主冷却器７がオフサイクル除霜を終了する
と、次に、図４に示す運転状態となり、補助冷却器８の
液電磁弁２３が開いたままで主冷却器７の液電磁弁２２
が開き、両冷却器７，８が同時に冷却運転を行う状態と
なる。この状態は、除霜終了後の主冷却器７が所定の冷
却運転を開始するまでの間、例えば３〜５分程度行われ
る。このときの各部の温度は、図にで示す主冷却器７
の入口部は前記同様に２．０〜３．０℃であるが、図に
で示す主冷却器７の出口部では、前記除霜運転で完全
な除霜を行っていないことから、主冷却器７に残存する
霜の影響により熱交換効率が若干低下しているため、除
霜直後の冷却運転開始時には、−３．５〜−４．５℃と
なり、やや高めの温度となる。したがって、この状態で
補助冷却器８を同時に冷却運転させることにより、図に
で示す補助冷却器８の出口部での冷気温度を、所定の
−４．５〜−５．５℃とすることができる。When the main cooler 7 completes the off-cycle defrosting, the operation state is changed to the operation state shown in FIG. 4, and the liquid solenoid valve 22 of the main cooler 7 is kept open while the liquid solenoid valve 23 of the auxiliary cooler 8 is opened.
Is opened, and the two coolers 7 and 8 perform a cooling operation at the same time. This state is performed, for example, for about 3 to 5 minutes until the main cooler 7 starts the predetermined cooling operation after the completion of the defrosting. At this time, the temperature of each part is determined by the main cooler 7 shown in FIG.
The inlet of the main cooler 7 has a temperature of 2.0 to 3.0 ° C. as described above, but the outlet of the main cooler 7 shown in FIG. Since the heat exchange efficiency is slightly lowered due to the influence of the frost remaining in the vessel 7, the temperature becomes -3.5 to -4.5 ° C at the start of the cooling operation immediately after the defrost, which is slightly higher. Therefore, by simultaneously performing the cooling operation of the auxiliary cooler 8 in this state, the cool air temperature at the outlet of the auxiliary cooler 8 shown in the figure can be set to a predetermined value of −4.5 to −5.5 ° C. it can.
【００２４】そして、上述の主冷却器７の冷やし込み運
転が完了して主冷却器７のみで十分に冷気を冷却できる
状態になると、補助冷却器８の液電磁弁２３が閉じて図
２に示す通常の運転状態に戻る。When the cooling operation of the main cooler 7 is completed and the cool air can be sufficiently cooled only by the main cooler 7, the liquid solenoid valve 23 of the auxiliary cooler 8 is closed and FIG. Return to the normal operating state shown.
【００２５】図５は、主冷却器７及び補助冷却器８の交
互運転のタイムチャートの一例を示すものであり、営業
時間を１０時から２０時までと仮定した場合のタイムチ
ャートである。図においてハッチングを付した部分は冷
却運転を行っている状態、その他はオフサイクル除霜を
行っている状態を示している。FIG. 5 shows an example of a time chart of the alternate operation of the main cooler 7 and the auxiliary cooler 8, and is a time chart when the business hours are from 10:00 to 20:00. In the figure, hatched portions indicate a state in which a cooling operation is being performed, and other portions indicate a state in which an off-cycle defrost is being performed.
【００２６】まず、ナイトカバーが取り付けられて負荷
が減少する夜間の０時から３時までの３時間は、主冷却
器７が通常より長いオフサイクル除霜を行い、主冷却器
７の除霜を十分に行うようにする。このとき、冷却能力
の低い補助冷却器８での冷却運転になるが、負荷が減少
しているため、庫内温度が上昇することはない。First, for three hours from 0 o'clock to 3 o'clock in the night when the load is reduced due to the night cover being attached, the main cooler 7 performs off-cycle defrost longer than usual, and the main cooler 7 is defrosted. Do enough. At this time, the cooling operation is performed by the auxiliary cooler 8 having a low cooling capacity. However, since the load is reduced, the internal temperature does not increase.
【００２７】次の３時から８時までの５時間は、通常の
主冷却器７による冷却運転を行う。このとき、前記図４
に示す除霜後の主冷却器７の冷やし込み運転は、負荷が
少ないために省略することができる。During the next 5 hours from 3 o'clock to 8 o'clock, the cooling operation by the ordinary main cooler 7 is performed. At this time, FIG.
The cooling operation of the main cooler 7 after the defrosting shown in (1) can be omitted because the load is small.
【００２８】そして、８時からの３０分間は、中間期や
冬期は、図に破線Ｘで示すように、補助冷却器８の冷却
運転を行って主冷却器７のオフサイクル除霜を行う。一
方、夏期は、この時間帯が、通常の店舗では商品のリパ
ックを行う時間帯であり、庫内の陳列商品が他の時間帯
に比べて極めて少なくなることを利用して両冷却器の完
全な除霜運転を行う。すなわち、両冷却器への冷媒の供
給を停止してオフサイクル除霜を行うか、必要に応じて
前記補助ヒータ１１に通電して１日１回の完全な除霜を
行う。During the 30 minutes from 8:00, in the middle and winter seasons, the cooling operation of the auxiliary cooler 8 is performed and the off-cycle defrosting of the main cooler 7 is performed as shown by the broken line X in the figure. On the other hand, in summer, this time period is a time period for repacking products in ordinary stores, and since the number of products displayed in the warehouse is extremely small compared to other time periods, both coolers are completely Perform a defrosting operation. That is, the supply of the refrigerant to both coolers is stopped to perform off-cycle defrost, or the auxiliary heater 11 is energized as necessary to perform complete defrost once a day.
【００２９】８時３０分から１３時までの４時間３０分
は、除霜を完了した主冷却器７による通常の冷却運転を
行い、１３時から１３時４５分までの４５分間は、前記
図３に示した主冷却器７のオフサイクル除霜、補助冷却
器８の冷却運転が行われる。次いで、１３時４５分から
３〜５分間、図４に示す主冷却器７の冷やし込み運転を
行った後、１８時１５分までは、主冷却器７による通常
の冷却運転を行う。For 4 hours and 30 minutes from 8:30 to 13:00, a normal cooling operation by the main cooler 7 which has completed the defrosting is performed, and for 45 minutes from 13:00 to 13:45, the above-mentioned FIG. , The off-cycle defrosting of the main cooler 7 and the cooling operation of the auxiliary cooler 8 are performed. Next, after the cooling operation of the main cooler 7 shown in FIG. 4 is performed from 13:45 to 3 to 5 minutes, a normal cooling operation by the main cooler 7 is performed until 18:15.
【００３０】さらに、８時１５分からの４５分間で前記
同様の主冷却器７のオフサイクル除霜を行い、３〜５分
間冷やし込み運転を行った後は、２４時まで５時間の
間、主冷却器７による冷却運転を行う。Further, the same off-cycle defrosting of the main cooler 7 as described above is performed for 45 minutes from 8:15, and after the cooling operation is performed for 3 to 5 minutes, the main cooler 7 is maintained for 5 hours until 24:00. The cooling operation by the cooler 7 is performed.
【００３１】このように、負荷が減少する非営業中の夜
間の運転時間と営業中とで除霜運転の間隔（冷却運転と
除霜運転の配分）を変えることにより、庫内温度に影響
を与えることなく十分な除霜を行うことができ、特に着
霜量が多い場合を除いて連続した冷却運転を行うことが
できる。これにより、半凍結品の陳列も問題なく行うこ
とができる。As described above, by changing the interval of the defrosting operation (distribution of the cooling operation and the defrosting operation) between the non-business hours during the non-business hours when the load decreases and the business hours, the temperature in the refrigerator is affected. Sufficient defrosting can be performed without giving, and a continuous cooling operation can be performed unless a large amount of frost is formed. Thereby, the display of the semi-frozen product can be performed without any problem.
【００３２】図６は、主冷却器７の除霜運転前後の温度
変化を表す図である。主冷却器７の出口部（図２等にお
けるの部分）の冷気温度は、Ａ点で主冷却器７がオフ
サイクル除霜に入ると次第に上昇するが、主冷却器７に
着霜した氷の融解潜熱によって冷気が冷却されるために
極端に上昇することはなく、Ｂ点の除霜運転終了時で
０．５℃程度に上昇するだけとなる。この状態では、補
助冷却器８が−１．０〜−９．５℃の範囲での冷却運転
を行うことにより、補助冷却器８の出口部（図２等にお
けるの部分）での冷気温度、すなわち、吹出口１２か
ら吹き出すエアカーテンの温度を、平均で所定の−４．
５〜−５．５℃とすることができる。FIG. 6 is a diagram showing a temperature change before and after the defrosting operation of the main cooler 7. The cold air temperature at the outlet of the main cooler 7 (portion in FIG. 2 and the like) gradually increases when the main cooler 7 enters off-cycle defrosting at point A. Since the cool air is cooled by the latent heat of melting, the temperature does not rise extremely but rises only to about 0.5 ° C. at the end of the defrosting operation at the point B. In this state, the auxiliary cooler 8 performs the cooling operation in the range of −1.0 to −9.5 ° C., so that the cool air temperature at the outlet of the auxiliary cooler 8 (portion in FIG. That is, the temperature of the air curtain blown out from the blowout port 12 is set to a predetermined value of -4.
The temperature can be 5 to -5.5 ° C.
【００３３】そして、主冷却器７の除霜終了後、両冷却
器が同時に冷却運転を行って主冷却器７の冷やし込み運
転を３〜５分間行い、主冷却器７が所定の冷却運転を再
開した時点（Ｃ点）で補助冷却器８の冷却運転を停止
し、オフサイクル除霜に切り換える。このように、数分
間だけ両冷却器を同時に冷却運転させることにより、庫
内温度の上昇を確実に防止することができる。After the defrosting of the main cooler 7, the two coolers simultaneously perform the cooling operation to perform the cooling operation of the main cooler 7 for 3 to 5 minutes, and the main cooler 7 performs the predetermined cooling operation. At the point of restart (point C), the cooling operation of the auxiliary cooler 8 is stopped, and the mode is switched to off-cycle defrosting. As described above, by simultaneously performing the cooling operation of both the coolers for only several minutes, it is possible to reliably prevent the temperature in the refrigerator from increasing.
【００３４】[0034]
【発明の効果】本発明は、以上説明したように、主冷却
器７の除霜運転中も庫内温度が上昇することがなくなる
ので、半凍結品の鮮度維持も確実に行うことができ、商
品の高鮮度管理を行うことができる。さらに、一つのダ
クト内に主冷却器と補助冷却器とを設置しているので、
組立構造が容易であるだけでなく、標準の１基の冷却器
に補助冷却器を追加するかたちで容易に対応することが
できる。また、背面パネルから庫内に冷気を導入するも
のであっても、主冷却器の除霜運転中に暖気が発生しな
いので、背面パネルから庫内に暖気が流入することがな
く、しかも、補助冷却器の冷却運転中の入口温度が低い
ので、補助冷却器の着霜量を極めて少なくできる。As described above, according to the present invention, the temperature inside the refrigerator does not increase even during the defrosting operation of the main cooler 7, so that the freshness of the semi-frozen product can be maintained without fail. High freshness management of the product can be performed. Furthermore, since the main cooler and the auxiliary cooler are installed in one duct,
Not only is the assembly structure easy, but it can be easily handled by adding an auxiliary cooler to a single standard cooler. Even if cold air is introduced into the refrigerator from the rear panel, no warm air is generated during the defrosting operation of the main cooler, so that no warm air flows into the refrigerator from the rear panel, and Since the inlet temperature during the cooling operation of the cooler is low, the amount of frost formed on the auxiliary cooler can be extremely reduced.
【００３５】また、補助ヒータを用いた除霜は、特に着
霜量が多い夏期でも１日１回で済むため、省エネルギー
が図れるとともに、除霜運転に液デフロストやホットガ
スを使用しないため、システム的にシンプルで電磁弁の
数も少なく、製造コストや運転コストの低減も図れる。In addition, defrosting using the auxiliary heater can be performed once a day even in summer, especially when the amount of frost is large, so that energy can be saved. In addition, liquid defrosting and hot gas are not used for defrosting operation. It is simple and has a small number of solenoid valves, so that manufacturing costs and operating costs can be reduced.
【図１】本発明の好適な実施の形態を示すオープンショ
ーケースの断面側面図である。FIG. 1 is a cross-sectional side view of an open showcase showing a preferred embodiment of the present invention.
【図２】冷凍サイクルにおける主冷却器及び補助冷却器
部分の配管系統を示すもので、主冷却器が冷却運転中の
状態を示す説明図である。FIG. 2 is a diagram illustrating a piping system of a main cooler and an auxiliary cooler in a refrigeration cycle, and is an explanatory diagram illustrating a state where the main cooler is performing a cooling operation.
【図３】同じく、主冷却器がオフサイクル除霜中、補助
冷却器が冷却運転中の状態を示す説明図である。FIG. 3 is an explanatory diagram showing a state in which a main cooler is performing off-cycle defrosting and an auxiliary cooler is performing cooling operation.
【図４】同じく、両冷却器が同時に冷却運転を行ってい
る状態を示す説明図である。FIG. 4 is an explanatory diagram showing a state in which both coolers are simultaneously performing a cooling operation.
【図５】主冷却器及び補助冷却器の交互運転の一例を示
すタイムチャートである。FIG. 5 is a time chart showing an example of alternate operation of a main cooler and an auxiliary cooler.
【図６】主冷却器の除霜運転前後の温度変化を表す図で
ある。FIG. 6 is a diagram showing a temperature change before and after a defrosting operation of a main cooler.
１ オープンショーケース ２ 断熱壁 ３ 本体 ４ 貯蔵室 ５ 外層ダクト ６ 内層ダクト ７ 主冷却器 ８ 補助冷却器 ９ 外層ファン １０ 内層ファン １１ 補助ヒータ １２ 防氷ヒータ １３ 吹出口 １４ 吸込口 １５ 背面パネル ２１ 高圧配管 ２２ 主冷却器７の液電磁弁 ２３ 補助冷却器８の液電磁弁 ２４ 主冷却器７の膨張弁 ２５ 補助冷却器８の膨張弁 ２６ 主冷却器７の吸入配管 ２７ 補助冷却器８の吸入配管 DESCRIPTION OF SYMBOLS 1 Open showcase 2 Insulated wall 3 Main body 4 Storage room 5 Outer duct 6 Inner duct 7 Main cooler 8 Auxiliary cooler 9 Outer fan 10 Inner fan 11 Auxiliary heater 12 Anti-icing heater 13 Outlet 14 Suction port 15 Back panel 21 High pressure Piping 22 Liquid electromagnetic valve of main cooler 7 23 Liquid electromagnetic valve of auxiliary cooler 8 24 Expansion valve of main cooler 7 Expansion valve of auxiliary cooler 8 26 Intake pipe of main cooler 7 27 Intake of auxiliary cooler 8 Piping
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−291084（ＪＰ，Ａ) 特開 昭62−294879（ＪＰ，Ａ) 特開 平９−126603（ＪＰ，Ａ) 特開 平１−137182（ＪＰ，Ａ) 特開 平５−87430（ＪＰ，Ａ) 実開 平４−57185（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F25D 21/06 F25D 11/00 101 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-291084 (JP, A) JP-A-62-294879 (JP, A) JP-A-9-126603 (JP, A) JP-A-1- 137182 (JP, A) JP-A-5-87430 (JP, A) JP-A-4-57185 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F25D 21/06 F25D 11 / 00 101
Claims (4)
開口した貯蔵室を形成し、該貯蔵室の開口部を、貯蔵室
の上部前端に設けた吹出口から下方に向けて吹き出され
る冷気のエアカーテンで覆うことにより貯蔵室内を冷却
するオープンショーケースにおいて、 前記貯蔵室と区画形成された内層ダクト内に、主冷却器
と、その風下側に位置して該主冷却器の除霜運転時に冷
却運転を行う補助冷却器とをそれぞれ設け、これら主冷
却器と補助冷却器とを交互に運転するとともに、 前記主冷却器の除霜運転はオフサイクル方式で行い、該
主冷却器に着霜した氷の融解潜熱を補助冷却器の冷却運
転に付加して利用し、 一方、前記補助冷却器の除霜運転もオフサイクル方式で
行い、冷却運転中の主冷却器から吹き出される低温の冷
気をオフサイクル除霜中の補助冷却器に送るようにした
ことを特徴とするオープンショーケースの運転方法。1. A storage room having an open front surface is formed in a main body constituted by a heat insulating wall, and an opening of the storage room is blown downward from an outlet provided at an upper front end of the storage room. In an open showcase that cools the storage room by covering it with an air curtain of cool air, a main cooler is provided in an inner layer duct defined by the storage room, and defrosting of the main cooler is located on the leeward side of the main cooler. An auxiliary cooler that performs a cooling operation during operation is provided, and the main cooler and the auxiliary cooler are alternately operated, and the defrosting operation of the main cooler is performed in an off cycle method, and the main cooler is The latent heat of melting of the frosted ice is used in addition to the cooling operation of the auxiliary cooler , while the defrosting operation of the auxiliary cooler is also performed in an off-cycle manner.
And the low-temperature cooling blown from the main cooler during the cooling operation.
An open showcase operating method, wherein air is sent to an auxiliary cooler during off-cycle defrosting .
記補助冷却器の冷却運転延べ時間より長くなるように設
定されていることを特徴とする請求項１記載のオープン
ショーケースの運転方法。2. The open showcase operating method according to claim 1, wherein a total cooling operation time of said main cooler is set to be longer than a total cooling operation time of said auxiliary cooler. .
運転終了後も所定時間冷却運転を継続することを特徴と
する請求項１記載のオープンショーケースの運転方法。3. The open showcase operating method according to claim 1, wherein the auxiliary cooler continues the cooling operation for a predetermined time after the defrosting operation of the main cooler is completed.
おける営業中と非営業中とにおける除霜運転の間隔が異
なることを特徴とする請求項１記載のオープンショーケ
ースの運転方法。4. The operating method of an open showcase according to claim 1, wherein intervals of the defrosting operation between a place where the open showcase is installed during business hours and during a non-business hour are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19506897A JP3271699B2 (en) | 1997-07-04 | 1997-07-04 | Open showcase driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19506897A JP3271699B2 (en) | 1997-07-04 | 1997-07-04 | Open showcase driving method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1123134A JPH1123134A (en) | 1999-01-26 |
| JP3271699B2 true JP3271699B2 (en) | 2002-04-02 |
Family
ID=16335031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19506897A Expired - Lifetime JP3271699B2 (en) | 1997-07-04 | 1997-07-04 | Open showcase driving method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3271699B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5179217B2 (en) * | 2008-02-19 | 2013-04-10 | 株式会社岡村製作所 | Defrost control device for freezing and refrigeration showcase |
| JP4644271B2 (en) * | 2008-06-09 | 2011-03-02 | 日立アプライアンス株式会社 | refrigerator |
| JP5380214B2 (en) * | 2009-09-04 | 2014-01-08 | 日立アプライアンス株式会社 | refrigerator |
| JP6993247B2 (en) * | 2018-01-22 | 2022-01-13 | フクシマガリレイ株式会社 | Cool box |
-
1997
- 1997-07-04 JP JP19506897A patent/JP3271699B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1123134A (en) | 1999-01-26 |
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